• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A length-adjustable connecting rod (30) for a reciprocating engine has a second connecting rod part (12) with guide cylinder (17) and a first connecting rod part (11) with guide shaft (15) received by the guide cylinder (17) and for adjusting an effective connecting rod length relative to this is movable, wherein the first connecting rod part (11) has a first (20) and the second connecting rod part (12) has a second stop surface (21), wherein when the first (20) on the second stop surface (21) concerns at least a portion of a on the connecting rod (10) along the connecting rod longitudinal axis (10) acting pressure force (F) on the guide shaft (15) over the first (20) and second stop surface (21) from the first connecting rod (11) in the second connecting rod (12) is transmitted. According to the invention, a length of the guide shaft (15) relative to a depth (T) of the guide cylinder (17) is dimensioned such that, when the effective connecting rod length is shortened, an end of the guide shaft (15) facing the second connecting rod part (12) is connected to the guide cylinder (17 ) goes to block before the first (20) on the second stop surface (21) is applied.
    公开号:AT519184A1
    申请号:T50191/2017
    申请日:2017-03-10
    公开日:2018-04-15
    发明作者:Ing Norbert Ausserhofer Dipl；Ing Andreas Krobath Dipl；Dipl Ing Pramberger Harald
    申请人:Avl List Gmbh；
    IPC主号:
    专利说明:

    Length adjustable connecting rod with stop surfaces
    The invention relates to a length-adjustable connecting rod for a reciprocating engine, in particular for a reciprocating internal combustion engine, wherein the connecting rod has at least a first Pleuelteil and a second Pleuelteil, wherein the second Pleuelteil at its end facing the first Pleuelteil a section having a guide cylinder, wherein the first Pleuelteil At its end facing the second connecting rod part has a guide shaft corresponding to the guide cylinder, wherein the guide shaft of the first connecting rod part is at least partially received by the guide cylinder in a functional use state of the connecting rod and is movable relative to this for adjusting an effective connecting rod length, in particular along a longitudinal axis of the connecting rod.
    Furthermore, the present invention relates to a reciprocating piston engine, in particular a reciprocating internal combustion engine, with at least one length-adjustable connecting rod and a vehicle with a reciprocating piston engine, in particular with a reciprocating internal combustion engine.
    As a connecting rod is commonly and also referred to in the context of the invention, the rod-like connecting element, which is used in a reciprocating engine for connecting the crankshaft with a reciprocating piston. The connecting rod serves to convert a linear movement of the reciprocating piston, in particular a linear oscillating axial movement of the reciprocating piston, which is usually a power or working piston, in a circular movement of the crankshaft, or conversely, a circular movement To convert the crankshaft into a linear movement of the reciprocating piston.
    As a crankshaft in the context of the invention, a shaft is referred to, which is adapted, preferably in a reciprocating engine, the linear oscillating movement, in particular the translational movement of one or more reciprocating, in particular by means of connecting rods, convert into a rotary motion or vice versa, a Turning rotary motion into a translatory movement.
    For connection to the reciprocating piston and the crankshaft, a connecting rod usually has at its two ends in each case a connecting rod bearing, usually in the form of a
    Pleuelauges, the connecting rod usually has a smaller connecting rod eye on the piston side end and a larger connecting rod eye on the crankshaft end, based on a functional installation state of a connecting rod in a reciprocating engine. By means of a piston pin mounted in the small connecting rod eye, a piston can be connected to the piston end of the connecting rod. About the larger connecting rod eye, the connecting rod can be connected to the crankshaft, wherein in the larger connecting rod usually designed as a plain bearing connecting rod bearing is arranged, which can be lubricated with hydraulic fluid, in particular with the engine oil of a reciprocating engine.
    The connecting rod is usually mounted in each case rotatable about an axis of rotation about the crankshaft and the piston pin, wherein the distance between the two axes of rotation defines an effective or effective connecting rod length. By changing the effective connecting rod length, in particular by adjusting the effective connecting rod length, the compression ratio can be changed in a reciprocating engine, since the change of the effective connecting rod length causes a shift of the top dead center of the piston movement. Length-adjustable connecting rods are therefore used in particular in reciprocating engines with variable compression ratio for adjusting the compression ratio. Changing the compression ratio by changing the effective connecting rod length is basically known from the prior art, for example from DE 10 2012 020 999 A1 or WO 2015/055582 A2.
    The length-adjustable connecting rod described in DE 10 2012 020 999 A1 has an eccentric arranged in the smaller connecting rod eye, two hydraulic cylinders arranged at least partially outside the connecting rod shaft being provided for adjusting the eccentric, which can be supplied with hydraulic fluid from the reciprocating piston engine oil. To control the two hydraulic cylinders and thus for length adjustment of the connecting rod, a control device is provided with two valves, by means of which the two hydraulic cylinders can be acted upon in each case with hydraulic medium that adjusts the desired change in the connecting rod length.
    WO 2015/055582 A2 discloses a length-adjustable connecting rod with a hydraulic length adjustment device with a hydraulic cylinder arranged inside the connecting rod, wherein the connecting rod has a first connecting rod shaft section and a second connecting rod shaft section, which are displaceable relative to one another along a longitudinal axis of the connecting rod and in particular telescopically in one another and can be pushed apart. One of the two connecting rod shaft sections forms the hydraulic cylinder of the length adjustment device and the other connecting rod shaft section an associated hydraulic piston. To control the length adjusting a hydraulically actuated control device is provided with a perpendicular to the crankshaft axis in a longitudinal center plane of the connecting rod axially displaceable, single-acting actuator piston as an actuating element. The actuating piston can be axially displaced from a first setting position to a second setting position in a functional use state of the connecting rod in a reciprocating piston engine using the applied in an associated reciprocating engine engine oil pressure, depending on the setting position of the actuating piston one or more hydraulic flows or Hydraulic outlets of the hydraulic length adjustment are enabled or disabled. About the spring stiffness of the return spring can be adjusted from which engine oil pressure displacement of the actuating piston is to be effected from the first control position to the second control position.
    Various concepts for the length adjustment of a connecting rod are known from the prior art, in particular various concepts for controlling such a length adjustment known and various concepts regarding the construction of the connecting rod per se.
    One of the challenges of length-adjustable connecting rods is, among other things, to achieve the connecting rod strength required for operation in a reciprocating piston engine, in particular in a reciprocating internal combustion engine for a vehicle.
    Another challenge is to constantly maintain a set effective connecting rod length over a defined period of time in order to be able to set a constant compression ratio over the defined period of time.
    It is therefore an object of the invention to provide an alternative, length-adjustable connecting rod for a reciprocating engine, preferably an improved length-adjustable connecting rod, in particular a connecting rod, with which the required Pleuestestigkeit can be achieved without a significant increase in weight and / or its effective Pleuellänge defined over a longer Period can be kept constant. Moreover, it is an object of the invention to provide an alternative reciprocating engine, in particular an improved reciprocating engine, and an alternative vehicle with a reciprocating engine, in particular an improved vehicle.
    These objects are achieved by the teaching of the independent claims. Preferred embodiments of the invention are the subject of the dependent claims and are explained in more detail below. The wording of the claims becomes part of the description.
    In a connecting rod according to the invention, the first connecting rod part has a first stop surface and the second connecting rod part has a second stop surface, wherein abutment of the first stop surface on the second stop surface limits a relative movement in a first direction. In particular, the connecting rod is configured such that, when the first stop surface abuts the second stop surface, at least a portion of a compressive force acting on the connecting rod along the longitudinal axis of the connecting rod passes the guide shaft past the first stop surface and the second stop surface from the first connecting rod part into the second connecting rod part is and / or vice versa.
    By means of the two stop surfaces according to the invention, a connecting rod according to the invention has the advantage that at least a portion of a compressive force acting on the connecting rod along the longitudinal axis of the connecting rod can be transferred from the first connecting rod part into the second connecting rod part and / or vice versa past the guide shaft. As a result, a compressive force acting on the guide shaft can be reduced and the guide shaft can be relieved. In particular, the risk of buckling of the guide shaft can be reduced, in some cases even completely avoided.
    As a result, the guide shaft can be made smaller. In particular, a cross section of the guide shaft can be selected to be smaller, at least over part of its length, so that the guide shaft requires less space in this area, as a result of which a more advantageous embodiment of a hydraulic length adjustment device can be realized.
    The guide cylinder of a length-adjustable connecting rod according to the invention can be designed as a vertical circular cylinder or alternatively as a general cylinder. In other words, in other words, the guide cylinder of a length-adjustable connecting rod according to the invention may have a circular or a circular shape deviating cross-section over its axial length, in particular any cross-sectional shape, and be designed as a slanted or vertical cylinder. It is only important that the guide cylinder and the guide shaft are formed in such a way, in particular corresponding to each other, that the required for adjusting the effective connecting rod length functionality can be achieved.
    Preferably, the guide cylinder of a length-adjustable connecting rod according to the invention is designed as a general hollow cylinder with at least one bottom surface, in particular as a vertical hollow cylinder with a bottom surface arranged normal to a longitudinal axis of the hollow cylinder. Preferably, the longitudinal axis of the guide cylinder coincides with the longitudinal axis of the connecting rod. Particularly preferably, the bottom surface of the hollow cylinder is circular or rectangular. In principle, however, any geometry for the bottom surface is possible. The hollow cylinder is preferably open or at least partially closed. Particularly preferably, the guide cylinder is at least partially beaker-shaped or blind-hole-shaped.
    Preferably, the first Pleuelteil, in particular the guide shaft of the first Pleuelteils, slidably mounted in the second Pleuelteil, in particular in the guide cylinder, wherein for adjusting the effective Pleuellänge preferably the guide shaft of the first Pleuelteils at least partially inserted into the guide cylinder of the second Pleuelteils and / or pulled out of this can be. Preferably, the first Pleuelteil and the second Pleuelteil for adjusting the effective Pleuellänge are telescopically displaceable relative to each other, in the sense of the invention under a telescopic relative displacement to each other a telescoping and / or pulling along a common displacement axis is understood, in particular without a rotation of or several of the associated components around the displacement axis. In some cases it is advantageous if the guide shaft and the guide cylinder can telescopically be pushed in or pulled apart.
    In some cases, it can also be advantageous if the guide shaft and the guide cylinder can be screwed or pulled apart in a spindle-like manner, in particular relative to one another along a common displacement axis with a rotation of guide shaft and / or guide cylinder around the displacement axis. In this case, however, the connecting rod is preferably designed such that the first connecting rod part and the second connecting rod part do not rotate about the displacement axis, but merely move along this relative to one another, i.e., in the direction of rotation. only translational. This can be achieved via a corresponding bearing of guide shaft and / or guide cylinder in each associated connecting rod.
    In an advantageous embodiment of a connecting rod according to the invention the connecting rod is designed such that a concern of the first stop surface on the second stop surface limits a shortening of the effective connecting rod length causing relative movement between the first Pleuelteil and the second Pleuelteil. In particular, a connecting rod according to the invention is configured such that a contact of the first stop surface on the second stop surface delimits a telescoping of the first connecting rod part and the second connecting rod part and thus limits a reduction, in particular a (further) reduction, of the effective connecting rod length.
    In a further advantageous embodiment of a connecting rod according to the invention, the first connecting rod part and / or the second connecting rod part at least one element of a connecting rod bearing, preferably a connecting rod, wherein the first connecting rod part is in particular adapted to be connected to a reciprocating piston of a reciprocating internal combustion engine. The second connecting rod part is in particular adapted to be connected to a crankshaft of a reciprocating internal combustion engine. The first connecting rod part preferably has a smaller connecting rod eye, which in particular forms a piston pin bearing. The second connecting rod part preferably has a larger connecting rod eye, which serves in particular as a crankshaft bearing.
    For connection to a reciprocating piston of a reciprocating piston engine, in particular a Hubkolbenbrennkraftmaschine, the first Pleuelteil, in particular by means of a connecting rod, preferably connected to known manner well known in the art using a piston pin with the reciprocating piston of a reciprocating engine. Alternatively, the first connecting rod part can be fixedly connected to a piston pin, in which case a reciprocating piston to be connected to the connecting rod of a reciprocating piston engine has a corresponding eye, from which the piston pin firmly connected to the connecting rod can be received and in which the fixed to the connecting rod connected piston pin can be stored in particular.
    The second connecting rod part is preferably designed for connection to a crankshaft of a reciprocating piston engine and can preferably, as usual in the prior art, be connected to the crankshaft by means of a larger connecting rod eye.
    In a further advantageous embodiment of a connecting rod according to the invention, the connecting rod has a hydraulic length adjustment for adjusting the effective connecting rod length, wherein the length adjusting preferably has at least one hydraulic cylinder with a piston, a first hydraulic working space and a second hydraulic working space, wherein the piston of the length adjustment in particular part of first conrod part and the hydraulic cylinder in particular part of the second connecting rod part.
    The length adjustment device of a connecting rod according to the invention can in principle be designed in various ways, for example as described in WO 2015/055582 A2 Längenverstelleinrichtungen, for more details regarding the design options and the operation of suitable for a connecting rod according to the invention length adjustment referred to the aforementioned document becomes.
    Preferably, in a connecting rod according to the invention, the guide cylinder forms the hydraulic cylinder of the length adjustment device and the guide shaft the piston, wherein the guide shaft is preferably designed as a double-acting piston, in particular as a double-acting acting stepped piston. The piston of the length adjusting device, in particular the guide shaft, preferably divides the hydraulic cylinder of the length adjusting device into the first hydraulic working space and the second hydraulic working space. During operation in a reciprocating piston engine, in particular in a reciprocating internal combustion engine, arise during a power stroke, high hydraulic working pressures in the two hydraulic working spaces of Längenverstelleinrichtung, which make high demands on the sealing of the hydraulic working spaces of Längenverstelleinrichtung. The smaller the hydraulic working surface available, the greater are the pressures resulting from compressive and / or tensile forces. Even small leaks, i. Already a leakage of small amounts of hydraulic medium, can lead to a pressure reduction in the respective working space of the hydraulic length adjustment and thus to a one or rebound and / or an undesirable length adjustment of the connecting rod. This problem can increase, especially at high speeds.
    By virtue of the smaller dimensions of the guide shaft possible on account of the invention, a larger hydraulic working surface can be provided on the piston in a connecting rod according to the invention, in particular on the side of the piston facing the first connecting rod part. As a result, when using a connecting rod according to the invention in a reciprocating engine in the hydraulic Längenverstelleinrichtung on the piston resulting hydraulic pressure ratios can be improved, in particular the resulting hydraulic pressures are reduced. As a result, in turn, the risk of an undesired change in the set, effective connecting rod length can be reduced or even avoided altogether. In particular, an undesired change in the set, effective connecting rod length due to input and / or rebound effects, which are caused by high, resulting in a combustion process in the combustion chamber of a cylinder of a reciprocating internal combustion engine forces and consequently resulting high pressures can be reduced and / or even avoided altogether ,
    In a connecting rod according to the invention, the hydraulic cylinder of the length adjustment is preferably completely within the connecting rod, in particular within a connecting rod shaft, being understood as a connecting rod in the context of the invention, a rod-like portion between the piston-side connecting rod end and the crankshaft side rod end.
    The hydraulic supply required for the Längenverstelleinrichtung preferably takes place via a hydraulic medium supply line, wherein the hydraulic medium supply line can be supplied in particular via the crankshaft-side connecting rod bearing with hydraulic medium.
    In a further advantageous embodiment of a connecting rod according to the invention, the second stop surface is a surface extending outward from the guide cylinder, preferably a surface extending outward in the radial direction from the guide cylinder, in particular a circumferentially formed surface.
    In a further advantageous embodiment of a connecting rod according to the invention, the second stop surface is at least partially formed by a, the first connecting rod facing edge surface of the wall of the guide cylinder. The edge surface preferably extends perpendicular to a lateral surface of the guide cylinder, in particular normal to the longitudinal axis of the connecting rod. As a result, the second stop surface can be formed in a particularly simple manner. That Preferably, the surface of an edge of the guide cylinder facing the first connecting rod part at least partially forms the second stop surface.
    In a further advantageous embodiment of a connecting rod according to the invention, the first abutment surface is a surface extending outward from the guide shaft, preferably a surface extending outward in the radial direction from the guide shaft, in particular a circumferentially formed surface. The first stop surface preferably extends parallel to the second stop surface, in particular normal to a longitudinal axis of the guide shaft, particularly preferably normal to the longitudinal axis of the connecting rod.
    In a further advantageous embodiment of a connecting rod according to the invention, the first connecting rod part is formed at least in two parts, wherein the first connecting rod part is preferably composed of at least a first portion and the guide shaft, and wherein the guide shaft in the region of its end facing away from the second connecting rod end in particular connected to the first portion is. In particular, the leadership is included in the first section. In this case, the at least one element of the connecting rod bearing of the first connecting rod part, in particular the smaller connecting rod eye, is preferably part of the first section of the first connecting rod part.
    In a further advantageous embodiment of a connecting rod according to the invention, the guide shaft is screwed to the first section in the region of its end remote from the second connecting rod part. Preferably, the guide shaft is screwed into the first section of the first connecting rod, in particular with its end remote from the second connecting rod end. As a result, a first connecting rod part can be formed with a guide shaft in a particularly simple manner. In particular, this makes it possible to manufacture a guide shaft with small tolerances in a particularly simple manner, since it can be produced independently of the first section of the first connecting rod part.
    In a further advantageous embodiment of a connecting rod according to the invention, the first stop surface of the first connecting rod is at least partially formed by a second connecting rod facing edge surface of the wall of a bore of the first portion of the first connecting rod. The bore in the first section of the first connecting rod part preferably has an internal thread for receiving the guide shaft, in particular an internal thread for screwing the first section with the guide shaft.
    In some cases, it may be advantageous if the second connecting rod part is designed in several parts, wherein it may be particularly advantageous if the guide cylinder is screwed into a portion of the second connecting rod.
    In a further advantageous embodiment of a connecting rod according to the invention, an effective length of the guide shaft is dimensioned relative to a depth of the guide cylinder such that when shortening the effective connecting rod length initially facing the second connecting rod end of the guide shaft with the guide cylinder to block, before the first stop surface abuts the second stop surface.
    In the context of the invention, the effective length of the guide shaft is understood to mean the distance between the first stop surface, in particular its centroid, as well as a first surface leading to the guide cylinder, in particular its centroid, projected onto the displacement axis of the guide shaft relative to the guide cylinder, i. measured parallel to the displacement axis of the guide shaft, wherein the first with the guide cylinder on block surface preferably forms a lower end of the guide shaft.
    As the depth of the guide cylinder in the context of the invention, the distance between the second stop surface, in particular its centroid, and a first with the guide shaft on block surface, in particular their centroid, projected onto the displacement axis of the guide cylinder relative to the guide shaft understood, the first with the guide shaft on block surface preferably at least partially forms a bottom of the guide cylinder.
    In other words, that is, in a further advantageous embodiment of a connecting rod according to the invention, the guide shaft is preferably dimensioned slightly longer than the guide cylinder is deep, so that when shortening the effective connecting rod length of the guide shaft first with the guide cylinder goes to block before the first stop surface of first connecting rod part bears against the second stop surface of the guide cylinder and / or goes with this block, wherein the second stop surface is formed in particular by an upper edge of the guide cylinder.
    In a further advantageous embodiment of a connecting rod according to the invention, the connecting rod is designed such that the first stop surface with the second stop surface only on reaching a defined, acting along the longitudinal axis of the connecting rod pressing force goes to block.
    For this purpose, preferably the effective length of the guide shaft are dimensioned relative to the depth of the guide cylinder and a diameter of the guide shaft and the material properties of the guide shaft chosen such that after the guide shaft with the guide cylinder has gone to block, one for bringing the first stop surface with the second stop surface required deformation of the guide shaft until, in particular substantially, is achieved upon reaching the defined compressive force. In this case, the connecting rod is preferably designed such, in particular the defined compressive force is selected such that after the guide shaft has gone to block with the guide cylinder, the first stop surface can be brought into contact with the second stop surface by an elastic deformation of the guide shaft with the second stop surface , In particular, from reaching the defined compressive force, i. in particular when the defined pressure force is exceeded, a proportion of the pressure force acting on the connecting rod along the longitudinal axis of the connecting rod can be transmitted past the guide shaft past the first connecting surface and the second stop surface from the first connecting rod part into the second connecting rod part and / or vice versa.
    With such a design of a connecting rod according to the invention, the compressive forces occurring can advantageously be distributed over several components of the connecting rod, in particular as required. Due to the only partial relief of the guide shaft, the additional load of the other components is lower.
    In an alternative, advantageous embodiment of a connecting rod according to the invention when applying the first stop surface on the second stop surface applied to the connecting rod compressive force is completely transferred to the guide shaft over the first stop surface and the second stop surface of the first connecting rod in the second connecting rod and / or vice versa.
    In a further advantageous alternative embodiment of a connecting rod according to the invention the effective length of the guide shaft is dimensioned smaller than the depth of the guide cylinder, so that before the second connecting rod end facing the guide shaft with the guide cylinder when shortening the effective connecting rod length goes to block, the first Stop surface rests against the second stop surface. In other words, in this case, the length of the guide shaft is preferably dimensioned smaller than the depth of the guide cylinder, so that in principle a block formation between the guide shaft and the guide cylinder is avoided and when shortening the effective connecting rod length in particular always the first stop surface on the second Stop surface abuts before the second connecting rod part facing the end of the guide shaft reaches the bottom of the guide cylinder. In this way, the forces acting on the guide shaft pressure forces can be kept very small. This allows a particularly small dimensioning of the guide shaft, in particular with regard to its cross section.
    If the guide shaft and / or the guide cylinder are respectively screwed in, the effective length of the guide shaft and / or the minimum and / or maximum effective connecting rod length can be set in a particularly simple manner, in particular if the guide shaft and / or the guide cylinder are rotationally symmetrical, namely merely by more or less screwing into the section of the associated connecting rod.
    An inventive Plubkolbenmaschine is characterized in that it comprises a connecting rod designed according to the invention.
    An inventive vehicle with a reciprocating engine is characterized in that it comprises a reciprocating piston engine according to the invention.
    These and other features are apparent from the claims and from the description also from the figures, wherein the individual features may be implemented individually or in each case in the form of sub-combinations in an embodiment of the invention, provided that it is technically feasible.
    The invention will be explained in more detail below with reference to non-limiting embodiments, which are illustrated in the figures, wherein the same reference numerals in components having the same function. In the figures show at least partially schematically:
    1a shows a first embodiment of a connecting rod according to the invention in a perspective view,
    1b shows the connecting rod according to the invention from Fig. 1a in a sectional view,
    An enlarged section of the connecting rod according to the invention from the
    1a and 1b, also in section,
    3a shows a detail of a second embodiment of a connecting rod according to the invention in a first state, also in a sectional view, and
    Fig. 3b shows the detail of the connecting rod of Fig. 3a in a second state.
    Fig. 1a shows a first embodiment of a length-adjustable connecting rod 10 according to the invention with a first Pleuelteil 11 and a second Pleuelteil 12, wherein the first Pleuelteil 11 at a first, piston end has a small connecting rod 13 for connecting the connecting rod 10 with a reciprocating piston of a reciprocating internal combustion engine , At the other, crankshaft-side end of the connecting rod 10, the connecting rod 10 has a larger connecting rod eye 23 for connecting the connecting rod 10 to a crankshaft of the reciprocating engine.
    As can be seen from FIG. 1 b, the second connecting rod part 12 has a section with a guide cylinder 17 at its end facing the first connecting rod part 11. The first connecting rod part 11 has, at its end facing the second connecting rod part 12, a guide shaft 15 which corresponds to the guide cylinder 17.
    The guide shaft 15 is at least partially received by the guide cylinder 17 and can be displaced relative to the guide cylinder 17 and the second connecting rod 12 for adjusting an effective connecting rod length LP relative to the guide cylinder 17 along a longitudinal axis L of the connecting rod 10, which in Fig. 1b by the unspecified double arrow is indicated. In particular, the guide shaft 15 can be pushed into the guide cylinder 17 or pulled out of this. A telescoping of guide shaft 15 and guide cylinder 17 causes a shortening of an effective connecting rod length LP, while a pulling or pulling out of the guide shaft 15 from the guide cylinder 17 leads to an extension of the effective connecting rod length LP.
    The effective connecting rod length LP can be set between a minimum effective connecting rod length LP1 and a maximum effective connecting rod length LP2, which differ by an amount DLP (see, for example, FIG. The effective connecting rod length LP is defined by the distance between the two axes of rotation of the connecting rod 10, around which the connecting rod 10 can rotate in a functional use state piston side and crankshaft side.
    2 shows an enlarged detail of the connecting rod 10 according to the invention from FIGS. 1a and 1b, by means of which it is particularly easy to see how the guide shaft 15 of the first connecting rod part 11 is received by the guide cylinder 17 of the second connecting rod part 12.
    In this embodiment of a connecting rod 10 according to the invention, the first connecting rod part 11 is formed in several parts and in particular from a first portion 14, which comprises the smaller connecting rod 13 and the guide shaft 15, wherein the first portion 14 of the first connecting rod 11 has a bore 16 with a here Unspecified internal thread has, in which the guide shaft 15 is screwed to a first end 15A, wherein the guide shaft 15 has in this area 15A a correspondingly formed, unspecified external thread. In an alternative embodiment of a connecting rod according to the invention, the guide shaft 15 can be secured by means of a transverse shrinkage fit, i. by means of a press fit, be connected to the first connecting rod 11, wherein the guide shaft 15 and / or the first portion 14 of the first connecting rod 11, in particular the bore 16 in the first connecting rod 11, to have in particular a corresponding excess.
    To adjust the effective connecting rod length, the connecting rod 10 according to the invention on an unspecified hydraulic Längenverstelleinrichtung, which comprises a hydraulic cylinder and a piston which can be moved to adjust the effective connecting rod length relative to each other along a displacement axis, in this embodiment, a connecting rod 10 of the invention Displacement axis coincides with the longitudinal axis L of the connecting rod and the guide cylinder 17 forms the hydraulic cylinder of the length adjustment and the guide shaft 15, the piston of the length adjustment. The length adjustment device works according to the same principle, as described in the above-mentioned several times WO 2015/055582 A2.
    The guide shaft 15 is designed as a double-acting stepped piston and divides a hydraulic working space in the guide cylinder 17 in a first, in this case lower, hydraulic space H1 and in a second, in this case upper, hydraulic space H2, wherein for sealing the two hydraulic spaces H1 and H2 against each other and relative to the guide cylinder 17 on the guide shaft 15 corresponding seals 19 are provided.
    According to the invention, the first connecting rod part 11 has a stop face 20 and the second connecting rod part 12 has a second stop face 21, wherein abutment of the first stop face 20 on the second stop face 21 is telescoping first connecting rod part 11 and second connecting rod part 12 or guide shaft 15 and guide cylinder 17 and thus limits a (further) shortening of the effective connecting rod length, wherein this exemplary embodiment of a connecting rod 10 according to the invention is configured such that the first stop surface 20 rests against the second stop surface 21 or rests when the minimum effective connecting rod length LP1 is reached.
    According to the invention, in this connecting rod 10, when the first abutment surface 20 abuts against the second abutment surface 21, a compressive force F acting on the connecting rod 10 along the longitudinal axis L of the connecting rod 10, symbolically represented here by the arrow labeled "F", is completely on Guide shaft 15 passed over the first stop surface 20 and the second stop surface 21 from the first connecting rod 11 in the second connecting rod 12 or vice versa.
    For this purpose, a length LF of the guide shaft 15 relative to a depth T of the guide cylinder 17 is dimensioned such that before shortening the effective connecting rod length LP (by telescoping guide shaft 15 and guide cylinder 17) the second connecting rod 12 facing the end of the guide shaft 15B a bottom 17B of Guide cylinder 17 reaches, the first stop surface 20 abuts against the second stop surface 21.
    In particular, the connecting rod 10 is formed such that between the guide shaft 15, in particular its lower end 15 B and the bottom 17 B of the guide cylinder 17 always a small gap 18 remains, so that a force applied to the connecting rod 10 compressive force F to reach the minimum, effective connecting rod length LP1 can always be completely transferred over the first stop surface 20 and the second stop surface 21 on the guide shaft 15 past the first connecting rod 11 in the second connecting rod 12 and / or vice versa, which is symbolized in Fig. 2 by the arrows designated F1. That Preferably, a connecting rod according to the invention formed according to the first embodiment 10 is formed such that even with a possibly due to an extremely high pressure force F resulting elastic deformation of the guide cylinder 17, the lower end 15 B of the guide shaft 15 is not with the bottom 17 B of the guide cylinder 17 Block goes and / or abuts on this. However, this is not mandatory. It is only important that the guide shaft 15 is sufficiently relieved.
    Since the force acting on the connecting rod 10 compressive force F, which is caused by the combustion pressure in the associated combustion chamber of the reciprocating engine is set at minimum effective Pleuellänge LP1 in the downstroke largest and is discharged at the connecting rod 10 according to the invention set with minimum effective Pleuellänge LP1 on the guide cylinder 17 and not over the guide shaft 15, a maximum, acting on the guide shaft 15 during operation of the reciprocating piston pressure force load, in particular a maximum during operation of the reciprocating engine on the guide shaft 15 acting compressive force F can be reduced.
    As a result, the guide shaft 15 can be made smaller, wherein the possible due to the invention relief of the guide shaft 15 in particular allows a reduction in the cross section of the guide shaft 15. As a result, a larger hydraulic working surface, in particular in the upper hydraulic space H2, can be provided on the piston 15 formed by the guide shaft 15, in particular on the side of the piston 15 facing the first connecting rod part 11. As a result, the hydraulic pressure generated in the hydraulic length adjustment device on the piston 15 during operation Pressure conditions are improved. As a result, in turn, the risk of undesired change in the set, effective connecting rod length LP, in particular an undesired rebound, can be reduced or even avoided altogether.
    The smaller dimensions of the guide shaft 15, however, in particular with regard to kinking and operational stability (HCF = high cycle fatigue), however limits set, which are defined in particular by the pressure loads occurring at larger, effective connecting rod lengths LP. Although the pressure loads occurring with larger, effective connecting rod lengths LP are lower overall than with a minimum, effective connecting rod length LP1 in the downstroke. For larger, effective connecting rod lengths LP, however, the first stop surface 20 is not on the second stop surface 21, so that a pressure force F acting on the connecting rod 10 can not be dissipated via the guide cylinder 15, but completely over the guide shaft 15 and the hydraulic medium in the lower Hydraulic room H1 is supported. That In these cases, no relief of the guide shaft 15 is achieved.
    3a shows a section of a second embodiment of a connecting rod 30 according to the invention, wherein the connecting rod 30 is basically constructed in the same way as the connecting rod 10 according to the invention described with reference to FIGS. 1a to 2. Functionally identical components are correspondingly provided with the same reference numerals. In the connecting rod 30 according to the invention shown in Fig. 3a, however, the length LF of the guide shaft 15 relative to the depth T of the guide cylinder 17 is dimensioned differently relative to this.
    In the exemplary embodiment of a connecting rod 30 according to the invention shown in FIG. 3a, the length LF of the guide shaft 15 is greater than the depth T of the guide cylinder 17 by an amount of tolerance AS.
    When shortening the effective connecting rod length LP by telescoping guide shaft 15 and guide cylinder 17, the lower end 15B of the guide shaft 15 thus initially goes to block with the bottom 17B of the guide cylinder 17, i. In this state, an entire applied to the connecting rod 30 compressive force F of the first connecting rod 11 via the guide shaft 15, in particular in the bottom 17 B of the guide cylinder 17, transmitted.
    If the lower end 15 B of the guide shaft 15 at the bottom 17 B of the guide cylinder 17, the application of a sufficiently large compressive force F leads to an elastic deformation of the guide shaft 15, in particular to a compression of the guide shaft 15 along the longitudinal axis L of the connecting rod 30 and thereby to a elastic shortening of the guide shaft 15 (length shortened = LF minus elastic deformation due to compressive force). As a result, there is a further, elastically caused shortening of the effective connecting rod length LP, wherein when elastically caused shortening of the effective connecting rod length LP always a gap 22 remains between the abutment surfaces 20 and 21, so that the entire pressure force F is still passed over the guide shaft 15.
    The connecting rod 30 according to the invention is designed in this way, in particular the guide shaft 15, that after the guide shaft 15 has gone to block with the guide cylinder 17, upon reaching a defined, acting along the longitudinal axis of the connecting rod 30 compressive force F, the first stop surface 20 with the second Stop surface 21 comes into contact and / or goes to block, which is achieved in particular by a deformation of the guide shaft 15, caused by the applied compressive force F by the amount AS along the longitudinal axis L. This state is shown in Fig. 3b.
    By a corresponding design of the guide shaft 15, in particular by a suitably sized length LF and a suitably sized cross-section and a suitably chosen material, the deformation caused by applying the defined compressive force F can be adjusted such that a shortening of the guide shaft by the amount AS results, in particular due to a purely elastic deformation, cf. Fig. 3a with Fig. 3b.
    At the moment when a pressure force F applied to the connecting rod 30 reaches the defined pressure force and abuts the first stop surface 20 on the second stop surface 21, according to the invention a compressive force F applied to the connecting rod 30 is at least partly, i. at least a portion of a pressure force F acting on the connecting rod along the longitudinal axis of the connecting rod 30 is transmitted past the guide shaft 15 via the first stop surface 20 and the second stop surface 21 from the first connecting rod part 11 into the second connecting rod part 12, see FIG. 3b.
    The transmitted via the stop surfaces 20 and 21 portion of the compressive force F is shown symbolically in Fig. 3b by the arrows denoted by F2 and transmitted via the guide shaft 15 from the first connecting rod 11 into the second connecting rod member 12, remaining portion of the pressing force F is through symbolizes the arrow marked F3.
    Because the guide shaft 15 is screwed into the section 14 of the first connecting rod 11 and is rotationally symmetrical, the effective length LF of the guide shaft 15 can be adjusted in a particularly simple manner and adapted to the guide cylinder 17 and adjust the defined pressure force F or to go to block go to the stop surfaces 20 and 21 required deformation AS of the guide shaft.
    With a corresponding design of a connecting rod according to the invention, in particular with a correspondingly large bandwidth of a permissible screwing depth of the guide shaft, a connecting rod according to the invention with the properties of the connecting rod 10 described with reference to FIG. 1 can optionally be provided as required or a connecting rod with the properties of the connecting rod 30 described with reference to FIGS. 2a and 2b.
    Of course, a variety of modifications, in particular of structural modifications, possible without departing from the content of the claims.
    Bezuaszeichenliste: 10, 30 according to the invention, length-adjustable connecting rod 11 first connecting rod 12 second connecting rod 13 small connecting rod 14 first portion of the first connecting rod 15 guide shaft 15A first end of the guide shaft 15B second end of the guide shaft 16 bore 17 guide cylinder 17B bottom of the guide cylinder 18 gap 19 seals 20 first Stop face 21 second stop face 22 gap between the first and second stop face upon abutment of the guide shaft on the guide cylinder 23 large connecting rod eye F pressing force F1, F2, F3 compressive force component H1 first hydraulic chamber H2 second hydraulic chamber L longitudinal axis of the connecting rod LF effective length of the guide shaft PL effective connecting rod length LP1 minimum effective connecting rod length LP2 maximum effective connecting rod length AS gap height of the gap between the first and second stop surface when the guide shaft on the guide cylinder T engages the depth of the guide cylinder
    权利要求:
    Claims (16)
    [1]
    claims
    1. length-adjustable connecting rod (10, 30) for a reciprocating piston engine, in particular for a reciprocating internal combustion engine, wherein the connecting rod (10, 30) has at least a first connecting rod part (11) and a second connecting rod part (12), wherein the second connecting rod part (12) its end facing the first connecting rod part (11) has a section with a guide cylinder (17), the first connecting rod part (11) having at its end facing the second connecting rod part (12) a guide shaft (15) corresponding to the guide cylinder (17), wherein the guide shaft (15) of the first connecting rod part (11) in a functional use state of the connecting rod (10, 30) is at least partially received by the guide cylinder (17) and movable for adjusting an effective connecting rod length relative thereto, in particular along a longitudinal axis of the connecting rod (L), wherein the first connecting rod part (11) has a first stop surface (20) and the second connecting rod part (12) has a second Stop surface (21), and wherein abutment of the first stop surface (20) on the second stop surface (21) limits a relative movement between the first connecting rod part (11) and the second connecting rod part (12) in a first direction, wherein the connecting rod (10, 30) is configured such that when the first stop surface (20) abuts against the second stop surface (21) at least a portion of a pressure force (F) acting on the connecting rod (10, 30) along the longitudinal axis of the connecting rod (L) on the guide shaft (21) 15) is transferred past the first stop face (20) and the second stop face (21) from the first connecting rod part (11) into the second connecting rod part (12) and / or vice versa.
    [2]
    Second connecting rod (10, 30) according to claim 1, characterized in that the connecting rod (10, 30) is designed such that a concern of the first stop surface (20) on the second stop surface (21) a shortening of the effective connecting rod length causing relative movement delimited between the first connecting rod part (11) and the second connecting rod part (12).
    [3]
    3. connecting rod (10, 30) according to claim 1 or 2, characterized in that the first Pleuelteil (11) and / or the second Pleuelteil (12) at least one Eie-ment of a connecting rod bearing (13, 14), preferably a connecting rod eye (13, 14), wherein the first connecting rod member (11) is adapted to be connected to a reciprocating piston of a reciprocating internal combustion engine, and wherein the second connecting rod member (12) is adapted to be connected to a crankshaft of a reciprocating internal combustion engine.
    [4]
    4. connecting rod (10, 30) according to one of claims 1 to 3, characterized in that the connecting rod (10, 30) has a hydraulic length adjustment for adjusting the effective connecting rod length, wherein the length adjusting at least one hydraulic cylinder (17) with a first hydraulic Working space (H1) and with a second hydraulic working space (H2) and with a piston (15), wherein the piston (15) of the Längenverstelleinrichtung part of the first connecting rod (11) and the hydraulic cylinder (17) is part of the second Pleuelteils (12).
    [5]
    5. connecting rod (10, 30) according to one of claims 1 to 4, characterized in that the second stop surface (21) is a from the guide cylinder (17) outwardly extending surface.
    [6]
    6. connecting rod (10, 30) according to one of claims 1 to 5, characterized in that the second stop surface (21) at least partially by a first connecting rod part (11) facing edge surface of the wall of the guide cylinder (17) is formed.
    [7]
    7. connecting rod (10, 30) according to one of claims 1 to 6, characterized in that the first stop surface (20) is a from the guide shaft (15) outwardly extending surface.
    [8]
    8. connecting rod (10, 30) according to one of claims 1 to 7, characterized in that the first connecting rod part (11) is formed at least in two parts, wherein the first connecting rod part (11) from at least a first portion (14) and the guide shaft ( 15) is assembled, wherein the guide shaft (15) in the region of its end facing away from the second connecting rod part (12) end is connected to the first portion (14).
    [9]
    9. connecting rod (10, 30) according to one of claims 1 to 8, characterized in that the guide shaft (15) is screwed in the region of its from the second connecting rod part (12) remote from the end with the first portion (14).
    [10]
    10. connecting rod (10, 30) according to one of claims 1 to 9, characterized in that the first stop surface (20) of the first connecting rod (11) by a second connecting rod part (12) facing edge surface of the wall of a bore of the first section ( 14) of the first connecting rod part (11) is formed.
    [11]
    11. connecting rod (30) according to one of claims 1 to 10, characterized in that a length of the guide shaft (15) relative to a depth of the guide cylinder (T) is dimensioned such that when shortening the effective connecting rod length first a second connecting rod part ( 12) facing the end of the guide shaft (15) with the guide cylinder (17) goes to block before the first stop surface (20) abuts against the second stop surface (21).
    [12]
    12. connecting rod (30) according to one of claims 1 to 11, characterized in that the connecting rod (30) is configured such that the first stop surface (20) with the second stop surface (21) only when a defined, along the longitudinal axis on the connecting rod (30) acting pressure force (F) goes to block.
    [13]
    13. connecting rod (10) according to one of claims 1 to 10, characterized in that when resting the first stop surface (20) on the second stop surface (21) on the connecting rod (10) applied pressure force (F) completely on the guide shaft (15 ) is transferred over the first stop surface (20) and the second stop surface (21) from the first connecting rod part (11) into the second connecting rod part (12) and / or vice versa.
    [14]
    14. connecting rod (10) according to claim 13, characterized in that the length of the guide shaft (15) is dimensioned smaller than the depth of the guide cylinder (T), so that before the shortening of the effective connecting rod length that the second connecting rod part (12) facing End of the guide shaft (15) reaches the bottom of the guide cylinder (17), the first stop surface (20) against the second stop surface (21).
    [15]
    15. A reciprocating piston engine, in particular reciprocating internal combustion engine, with at least one connecting rod (10, 30), characterized in that the connecting rod (10, 30) is designed according to one of claims 1 to 14.
    [16]
    16. Vehicle with a reciprocating engine, in particular with a reciprocating internal combustion engine, characterized in that the reciprocating engine is designed according to claim 15.
    类似技术:
    公开号 | 公开日 | 专利标题
    AT519184B1|2018-07-15|Length adjustable connecting rod with stop surfaces
    EP3371470B1|2019-02-27|Length-adjustable connecting rod
    EP2843209A1|2015-03-04|Combustion engine and connecting rod
    EP3058239A2|2016-08-24|Length-adjustable connecting rod
    AT519156B1|2018-11-15|Length adjustable connecting rod for a reciprocating engine, reciprocating engine and vehicle
    AT517718A4|2017-04-15|LENGTH-ADJUSTABLE CONNECTING ROD
    AT519149B1|2018-11-15|Length adjustable connecting rod with control device
    WO2018060458A1|2018-04-05|Length-adjustable connecting rod having stop surfaces
    AT517492A1|2017-02-15|LENGTH-ADJUSTABLE CONNECTING ROD
    DE102016008306A1|2018-01-11|Connecting rod with adjustable connecting rod length
    AT517680B1|2017-06-15|LENGTH-ADJUSTABLE CONNECTING ROD
    DE102015103207A1|2016-09-08|Connecting rod and internal combustion engine
    DE102011111816A1|2013-02-28|Device for achieving variable compression ratio in lifting cylinder motor, has pin whose cylindrical sections are coaxial to each other, and piston pin comprising fixing agents fixed with respect to rotationally fixed piston of motor
    DE102015110663A1|2017-01-05|internal combustion engine
    DE202014010614U1|2016-02-02|Clamping device and component with such a clamping device
    DE102015103206B4|2021-02-04|Connecting rod with an eccentric adjusting device and an internal combustion engine with an adjustable compression ratio
    EP3519709B1|2021-11-03|Connecting rod adjustable in length and having stop surfaces
    AT519652B1|2018-09-15|Sealing device and hydraulic piston with sealing device
    AT15890U1|2018-08-15|Multi-part connecting rod with adjustable connecting rod length
    DE102015103203B4|2021-02-04|Connecting rod with an eccentric adjusting device and internal combustion engine with such a connecting rod
    CH714321A1|2019-05-15|Adjusting device for an axial piston machine.
    AT522494B1|2021-02-15|Length-adjustable connecting rod with curvature
    AT520451B1|2019-04-15|Length adjustable connecting rod for a reciprocating engine
    AT522322B1|2020-10-15|Connecting rod with positive connection
    DE102013224479A1|2015-06-03|linear actuator
    同族专利:
    公开号 | 公开日
    AT519184B1|2018-07-15|
    DE102017217492A1|2018-04-05|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US988344A|1910-05-16|1911-04-04|Walter K Holzmueller|Explosion-engine.|
    JPS529703A|1975-07-10|1977-01-25|Isamu Mitsunaka|Internal combustion engine of no public harm|
    WO2002010568A1|2000-08-02|2002-02-07|Yadegar Jerry I|Hydraulically adjustable connecting rod for internal combustion engine efficiency|
    DE102005036701A1|2005-08-04|2007-02-08|Will, Karl|Spring rod used as a length-adjustable drive rod in an internal combustion engine comprises a slim shaft and a support that in the resting state run parallel to the central axis of the rod|
    WO2013092364A1|2011-12-23|2013-06-27|Avl List Gmbh|Connecting rod for a reciprocating-piston engine|
    WO2015055582A2|2013-10-18|2015-04-23|Avl List Gmbh|Length-adjustable connecting rod|
    DE102017110363A1|2017-05-12|2018-11-15|Avl List Gmbh|Longer adjustable connecting rod with two telescopic connecting rod sections|
    DE102018124781A1|2018-10-08|2020-04-09|Avl List Gmbh|Assembly method for joining the telescopic rod part of a VCR connecting rod|
    AT521677B1|2018-10-08|2020-04-15|Avl List Gmbh|Assembly method for joining the telescopic rod part of a VCR connecting rod|
    AT521501B1|2018-12-03|2020-02-15|Avl List Gmbh|Length-adjustable connecting rod with press connection|
    AT521517B1|2019-01-30|2020-02-15|Avl List Gmbh|Length-adjustable connecting rod with pin connection|
    AT16800U1|2019-03-08|2020-09-15|Avl List Gmbh|Screw connection for length-adjustable connecting rod with different thread pitches|
    AT522159B1|2019-03-08|2020-09-15|Avl List Gmbh|Screw connection for length-adjustable connecting rod with melt insert|
    AT522077B1|2019-05-15|2020-08-15|Avl List Gmbh|Length-adjustable connecting rod with support ring nut|
    AT522494B1|2019-05-15|2021-02-15|Avl List Gmbh|Length-adjustable connecting rod with curvature|
    AT522985B1|2019-10-08|2021-07-15|Avl List Gmbh|Length-adjustable connecting rod with a sealing device|
    法律状态:
    2019-07-15| PC| Change of the owner|Owner name: AVL LIST GMBH, AT Effective date: 20190515 Owner name: IWIS MOTORSYSTEME GMBH & CO. KG, DE Effective date: 20190515 |
    优先权:
    申请号 | 申请日 | 专利标题
    AT508892016|2016-09-30|EP17778256.2A| EP3519709B1|2016-09-30|2017-09-29|Connecting rod adjustable in length and having stop surfaces|
    CN201780072892.8A| CN110382882A|2016-09-30|2017-09-29|The connecting rod of adjustable in length with motion-stopping surface|
    PCT/EP2017/074841| WO2018060458A1|2016-09-30|2017-09-29|Length-adjustable connecting rod having stop surfaces|
    US16/338,071| US20200217246A1|2016-09-30|2017-09-29|Length-adjustable connecting rod having stop surfaces|
    [返回顶部]