• 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:
    The invention relates to a length-adjustable connecting rod (1) for a piston engine, the connecting rod (1) having a first connecting rod eye (7) for receiving a piston pin and a second connecting rod eye (4) for receiving a crankshaft pin, the distance between the piston pin and the crankshaft journal is adjustable in the longitudinal direction (A) of the connecting rod (1) by means of a hydraulic control device (21) with a hydraulic control valve (34). The hydraulic control device (21) has a control cylinder (36), a control slide (35) which is displaceably guided in the control cylinder (36) and pressurizable and two discharge valves (41, 42) which can be actuated by the control slide (35). 42) is connected to a non-pressurized drain channel (32) in order to discharge hydraulic fluid that flows out into the environment. The invention also relates to the use of such a length-adjustable connecting rod (1) with a hydraulic control device (21) in a piston engine and a corresponding piston engine.
    公开号:AT521256A4
    申请号:T50868/2018
    申请日:2018-10-08
    公开日:2019-12-15
    发明作者:Heller Malte；Kai Arens Dr；Riba Zóltan；Bodensteiner Martin；Latz Steffen
    申请人:Avl List Gmbh；Iwis Motorsysteme Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Summary
    The invention relates to a length-adjustable connecting rod (1) for a piston engine, the connecting rod (1) having a first connecting rod eye (7) for receiving a piston pin and a second connecting rod eye (4) for receiving a crankshaft pin, the distance between the piston pin and the crankshaft journal is adjustable in the longitudinal direction (A) of the connecting rod (1) by means of a hydraulic control device (21) with a hydraulic control valve (34). The hydraulic control device (21) has a control cylinder (36), a control slide (35) which is displaceably guided in the control cylinder (36) and can be pressurized and two drain valves (41, 42) which can be actuated by the control slide (35), a drain valve ( 42) is connected to a non-pressurized drain channel (32) in order to discharge hydraulic fluid that flows out into the environment. The invention also relates to the use of such a length-adjustable connecting rod (1) with a hydraulic control device (21) in a piston engine and a corresponding piston engine.
    Fig. 1/24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Hydraulic control valve for a length-adjustable connecting rod with split drainage
    The present invention relates to a length-adjustable connecting rod for a piston engine, the connecting rod having a first connecting rod eye for receiving a piston pin and a second connecting rod eye for receiving a crankshaft pin, the distance between the piston pin and the crankshaft pin in the longitudinal direction of the connecting rod using a hydraulic control device with hydraulic Control valve is adjustable, and wherein the hydraulic control valve has a control cylinder and a displaceably guided in the control cylinder, pressurizable control slide and two drain valves actuated by the control slide. The invention further relates to the use of such a length-adjustable connecting rod and a piston engine with a length-adjustable connecting rod.
    In the case of internal combustion engines with reciprocating pistons, efforts are being made to change the compression ratio during operation and to adapt it to the particular operating state of the engine in order to improve the thermal efficiency of the internal combustion engine. As the compression ratio increases, the thermal efficiency increases, but too high a compression ratio can lead to unintentional auto-ignition of the piston engine. Such an early combustion of the fuel not only leads to unsteady running and the so-called knocking of the engine, but can also lead to component damage to the engine. In the partial load range, the risk of auto-ignition is lower, so that a higher compression ratio is possible.
    There are different solutions for realizing a variable compression ratio (VCR), with which the position of the crank pin of the crankshaft or the piston pin of the reciprocating piston is changed or the effective length of the connecting rod is varied. There are solutions for continuous and discontinuous adjustment of the components. A continuous length adjustment of the distance between the piston pin and the crankshaft journal enables the compression ratio to be adjusted smoothly to the respective operating point and thus an optimal efficiency of the internal combustion engine. In contrast, discontinuous adjustment of the connecting rod length with just a few steps results in structural and operational advantages and still enables a significant improvement in efficiency compared to a conventional piston engine, as well as corresponding savings in consumption and pollutant emissions.
    / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    EP 1 426 584 A1 describes a discontinuous adjustment of the compression ratio for a piston engine, in which an eccentric connected to the piston pin of the reciprocating piston enables the compression ratio to be adjusted, the eccentric being fixed in the respective end positions of the swivel range by means of a mechanical locking device. In contrast, DE 10 2005 055 199 A1 discloses a length-adjustable connecting rod with which different compression ratios can be achieved, the eccentric being fixed in its position by two cylinder-piston units and the hydraulic pressure difference of the supplied engine oil.
    WO 2013/092364 A1 shows a length-adjustable connecting rod with connecting rod parts which can be telescopically pushed into one another, one connecting rod part having an adjusting piston and the second connecting rod part having a cylinder in which the adjusting piston is arranged to be longitudinally movable. This cylinder-piston unit is supplied with engine oil via a hydraulic control device with an oil pressure-dependent control valve in order to adjust the length of the connecting rod.
    Another telescopically length-adjustable connecting rod is described in WO 2015/055582 A2, the adjusting piston provided in the first connecting rod part dividing the cylinder into two pressure chambers, which are supplied with engine oil by a hydraulic control device. The two pressure chambers of this cylinder-piston unit are supplied with engine oil via check valves, engine oil being only under pressure in one pressure chamber. If the length-adjustable connecting rod is in the long position, there is no engine oil in the upper pressure chamber, whereas the lower pressure chamber is completely filled with engine oil. During operation, the connecting rod is subjected to alternating tensile and pressure loads due to the gas and inertial forces. In the long position of the connecting rod, a tensile force is absorbed by the mechanical contact with the upper stop of the adjusting piston. This does not change the connecting rod length. An acting pressure force is transferred via the piston surface to the lower pressure chamber filled with engine oil. Since the check valve of this chamber prevents the return of the engine oil, the pressure of the engine oil increases so that the connecting rod is hydraulically locked in this direction. The connecting rod length does not change here either. In the short position of the length-adjustable connecting rod, the conditions in the cylinder-piston unit are reversed. The lower pressure chamber is empty, while the upper pressure chamber is filled with engine oil. Accordingly, a tensile force causes an increase in pressure in the upper chamber and a hydraulic locking of the length-adjustable connecting rod, while a compressive force is absorbed by the mechanical stop of the adjusting piston.
    / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    The connecting rod length of this length-adjustable connecting rod can be adjusted in two stages by emptying one of the two pressure chambers, one of the two check valves in the inlet channel being bridged by a corresponding return channel. Engine oil flows through these return channels between the pressure chamber and the supply of engine oil, as a result of which the respective check valve loses its effect. The two return channels are opened and closed by an oil pressure-dependent control valve of the hydraulic control device, one return channel always being open and the other being closed. The actuator for switching the two return channels is controlled hydraulically by the supply pressure of the engine oil, the supply of engine oil being provided via corresponding hydraulic medium channels in the connecting rod and the bearing of the crankshaft pin in the second connecting rod eye. The outlet valve assigned to the respective return channel is opened or closed by the actuator, the outlet valve usually being reset automatically, for example by means of a return spring. The active adjustment of the connecting rod length is then carried out by deliberately emptying the pressure chamber filled with engine oil using the mass and gas forces acting on the connecting rod, whereby the other pressure chamber is supplied with engine oil and hydraulically blocked via the associated check valve.
    During operation, the connecting rod is constantly subjected to tensile and pressure loads, so that in the pressure chambers and the associated hydraulic lines up to the drain valve of the control valve, a swelling hydraulic medium pressure of over 300 bar is created. Furthermore, the function of the hydraulic control device for switching the two return channels requires not only small tolerances for the different components and highly effective seals to delimit the different pressure ranges, but also a reliable supply of the control valve and the pressure chambers with the pressurized engine oil via corresponding hydraulic medium channels in the connecting rod. This generally results in very high demands on the connecting rod components, including the components of the hydraulic control device, but also on the functioning of the control valve.
    It is therefore the object of the present invention to provide an improved construction and function of a generic length-adjustable connecting rod.
    According to the invention, this object is achieved in that a first drain valve is connected to an oil supply channel in order to flow out of a first pressure chamber
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Provide hydraulic medium for filling a second pressure chamber, and a second drain valve is connected to a non-pressurized drain channel in order to discharge the hydraulic medium flowing out of the second pressure chamber of the length-adjustable connecting rod to the environment.
    In contrast to conventional length-adjustable connecting rods, in which the discharge valves are drained into the pressurized oil supply channel of the pressure chambers or the common control pressure line of the hydraulic control device for the rapid filling of the pressure chambers of the hydraulic adjustment device, the provision of an overpressure-free drainage channel enables a partial discharge of the in the hydraulic adjusting device to the surrounding hydraulic fluid. Since the hydraulic fluid flowing out of the second pressure chamber during a length adjustment is completely released into the environment, fresh engine oil is supplied to the hydraulic adjusting device when the first pressure chamber is filled. This enables a uniform cooling or tempering of the length-adjustable connecting rod with the engine oil of the piston engine used as hydraulic medium. At the same time, the drainage of the hydraulic medium flowing out of the first pressure chamber via the first drain valve into the oil supply channel enables the second pressure chamber to be filled quickly.
    Especially with a frequent adjustment of the length of the connecting rod, the continuous use of the hydraulic fluid emerging from the pressure chambers for simultaneous filling of the other pressure chamber leads to heating of the length-adjustable connecting rod and in particular the hydraulic control device, since the hydraulic system arises when the hydraulic medium flows in and out Heat remains in the hydraulic adjustment system. In the embodiment of the length-adjustable connecting rod according to the invention, the drain valve, which is connected to the environment via an overpressure-free drainage channel, enables this heat to be dissipated and the temperature of the length-adjustable connecting rod to be controlled uniformly by the engine oil which is regularly added from the oil circuit of the piston engine. The control slide can be constructed very simply and only requires a seal with respect to the control cylinder.
    The second drain valve connected to the non-pressurized discharge channel is expediently connected to the pressure chamber (lower pressure chamber) which is completely filled with engine oil in the long position of the connecting rod, in order to switch from a high compression ratio to a low compression ratio / 24 when the piston engine accelerates
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG without delay. Accordingly, the first drain valve connected to the oil supply channel is connected to the pressure chamber (upper pressure chamber), which is completely filled with engine oil in the short position of the connecting rod, so that even with a low control pressure for the hydraulic control valve, sufficient engine oil is available to the other pressure chamber ( lower pressure chamber) for the long position of the connecting rod with engine oil.
    The two drain valves can advantageously be actuated alternately by the control slide. This enables the hydraulic control device to function reliably with alternating filling of the assigned pressure chambers and the safe positioning of the connecting rod in the set length position.
    The preferred embodiment provides that the hydraulic control valve has a return spring in order to hold the control slide in a first starting position or to return it to the first starting position, the return spring preferably being arranged around the control slide. In other words, the return spring preferably surrounds the control slide at least in sections. The return spring makes it possible to provide two different switching positions in the hydraulic control device, without an active return mechanism, additional pressure chambers or supply lines. As a result, the manufacturing costs can be kept low while at the same time increasing the functional reliability. Furthermore, such a return spring can be easily adapted to different control pressures without having to change the entire construction of the hydraulic control device or even the length-adjustable connecting rod. The arrangement of the return spring around the control slide reduces the installation space required for the control valve and, at the same time, the manufacturing outlay.
    A special variant provides that the control slide has a centrally arranged control piston, the two drain valves being arranged on both sides of the control piston movable in the direction of a control slide axis. The central arrangement of the control piston enables a simple construction of the hydraulic control valve and thus also of the hydraulic control device. In addition, the components of the control valve can be quickly and easily assembled from both sides, which means that complex and nested constructions and arrangements of the components can be dispensed with.
    / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    For simple assembly of the connecting rod or quick assembly of the hydraulic control valve, the two drain valves can be arranged coaxially with the spool axis of the spool. The arrangement of the drain valves relates to the opening direction of the valve bodies in the drain valves. Furthermore, the coaxial arrangement relates to the spatial direction of the opening direction of the valve body, so that axis-parallel arrangements of the two drain valves are also included.
    In an alternative embodiment, the two drain valves are arranged inclined to the spool axis, preferably perpendicular to the spool axis. This inclined arrangement of the drain valves enables a more compact construction of the hydraulic control valve and thus also overall smaller dimensions of the connecting rod with a corresponding reduction in mass. Furthermore, an inclined arrangement of the drain valves can minimize interfering influences on the other components of the hydraulic control valve, and negative influences of the inertia of the hydraulic medium in the hydraulic medium channels and the components of the hydraulic control device can be taken into account.
    A further embodiment provides that the control slide has a control piston which is arranged at a first end of a control slide and a switching contour arranged at a second end of the control slide, the two drain valves being able to be actuated alternately by means of the switching contour. Such a mushroom-shaped control slide with a control piston on the head side and a switching contour on the foot side enables the hydraulic control valve to be mounted on one side through a single opening in the length-adjustable connecting rod. In addition, such a control slide enables a preassembly of several components or the entire control valve, which reduces the manufacturing costs. In addition to a simple and alternate control of the drain valves, the foot-side switching contour of the control slide also enables a direct transmission of the axial movement from the control slide into a lifting movement of the drain valves. The switching contour can be designed as a flattening of the hollow slide with depressions or projections in order to control the at least two drain valves coupled.
    An embodiment of the length-adjustable connecting rod provides that two connecting rod parts are provided, the first connecting rod part having the first connecting rod eye and the second connecting rod part having the second connecting rod eye, and the first connecting rod part being movable, preferably telescopic, relative to the second connecting rod part, to adjust the distance between the piston pin and the crankshaft journal. In contrast / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG on connecting rods with eccentrics enable two connecting rod parts that can be moved in the longitudinal direction of the connecting rod to provide a stable structure and safe and permanent operation of the adjustable connecting rod. At least one cylinder-piston unit hydraulically connected to the hydraulic control device can be provided in order to move the first connecting rod part relative to the second connecting rod part, the first connecting rod part being connected to an adjusting piston of the cylinder-piston unit and the second connecting rod part being a cylinder bore the cylinder-piston unit. The adjusting piston, which can be moved back and forth in the cylinder bore, forms the first and second pressure chambers of the hydraulic adjusting device with the cylinder bore. In addition to a very robust construction of the length-adjustable connecting rod, this also enables simple and inexpensive connecting rod parts, the adjusting piston of the first connecting rod part preferably being connected directly to the piston rod and the connecting rod head to the first connecting rod eye, and the second connecting rod part having a housing in which, in addition to the cylinder bore, also the hydraulic control device is provided.
    Furthermore, the invention relates to the use of a length-adjustable connecting rod with a hydraulic control valve in a piston engine, the hydraulic control valve of the control device having a control cylinder, a control slide which is displaceably guided in the control cylinder and can be pressurized, and two drain valves, the first drain valve including an oil supply channel is connected to provide the hydraulic fluid flowing out of a first pressure chamber for filling a second pressure chamber and the second drain valve is connected to an overpressure-free drain channel to discharge the hydraulic fluid flowing out of the second pressure chamber of the length-adjustable connecting rod to the environment.
    The coupling of the second drain valve with the pressureless discharge channel enables the safe discharge of the hydraulic medium from the length-adjustable connecting rod and the necessary provision of fresh, cooler hydraulic medium for renewed length adjustment of the connecting rod from the assigned engine oil circuit of the piston engine. At the same time, the coupling of the second drain valve to the oil supply channel enables safe filling of the second pressure chamber even at a low control pressure. In addition to a safe function, there is also sufficient cooling and temperature control of the length-adjustable connecting rod to the operating temperature of the piston engine. In addition, contamination and sooting of the hydraulic control device is avoided by the continuous exchange of part of the hydraulic medium.
    / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    In a further aspect, the invention relates to a piston engine with at least one engine cylinder, a reciprocating piston moving in the engine cylinder and at least one adjustable compression ratio in the engine cylinder, and with a length-adjustable connecting rod connected to the reciprocating piston according to the previously described embodiments. All reciprocating pistons of the piston engine are preferably equipped with such a length-adjustable connecting rod, and the control device of the length-adjustable connecting rod is connected to the engine oil hydraulics of the piston engine. The fuel saving of such a piston engine can be considerable if the compression ratio is set accordingly depending on the respective operating state. By means of the non-pressurized drain channel, which is connected to the second drain valve of the hydraulic control valve, the hydraulic fluid flowing out of a pressure chamber of the length-adjustable connecting rod can be released directly to the environment and thus, with good functional reliability, also sufficient temperature control of the hydraulic control device or the entire length-adjustable one Allow connecting rod.
    A non-limiting embodiment of the invention is explained in more detail below with reference to drawings. Show it:
    1 is a schematic view of a partially cut-out connecting rod according to the invention,
    Fig. 2 is a schematic view of another embodiment of a partially cut, length-adjustable connecting rod according to the invention, and
    Fig. 3 is a schematic view of the length-adjustable connecting rod from Fig. 1 or 2 with a schematic representation of the hydraulic control device.
    The length-adjustable connecting rod 1 shown in the schematic view in FIG. 1 comprises two connecting rod parts 2, 3 that can be moved telescopically relative to one another. The lower connecting rod part 2, which is shown at the bottom in FIG. 1, has a large connecting rod eye 4 with which the length-adjustable connecting rod 1 is mounted on the crankshaft (not shown) of the piston engine. For this purpose, a bearing shell 5 is further arranged on the lower connecting rod part 2, which together with the lower region of the lower connecting rod 2, which is also designed like a bearing shell, forms the large connecting rod eye 4. The bearing shell 5 and the lower connecting rod part 2 are connected to one another by means of connecting rod screws (shown schematically as dashed lines). The upper connecting rod part 3 has a connecting rod head 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG with a small connecting rod eye 1, which receives the piston pin (not shown) of a reciprocating piston in the piston engine. The connecting rod head 6 is connected to the piston rod 8 and, via the piston rod 8, to the adjusting piston 9 of the adjusting device of the length-adjustable connecting rod 1, which is designed here as a cylinder-piston unit 10. The connecting rod head 6 is usually screwed or welded to the piston rod 8, while the adjusting piston 9 and the piston rod 8 can then be formed in one piece. Before assembly of the upper connecting rod part 3, this enables the cylinder cover 15 of the cylinder-piston unit and the rod seal 16 on the piston rod 8 and the piston seals 17, 18 to be arranged on the adjusting piston 9 simply and without damage.
    The upper connecting rod part 3 is telescopically guided in the lower connecting rod part 2 via the adjusting piston 9 in order to adjust the distance between the piston pin of the reciprocating piston accommodated in the small connecting rod eye 7 and the crankshaft of the piston engine accommodated in the large connecting rod eye 4, so as to adjust the compression ratio of the piston engine to adapt to the respective operating state. This makes it possible to operate the piston engine in the partial load range with a higher compression ratio than under the full load range, thus increasing the efficiency of the engine. In the housing 11 of the lower connecting rod part 2, a cylinder 12 is formed in the upper region, which is introduced as a cylinder bore or cylinder sleeve into the housing 11 of the lower connecting rod part 2. In the cylinder 12, the adjusting piston 9 of the upper connecting rod part 3 is arranged to be movable in the longitudinal direction A of the connecting rod 1 in order to form the cylinder-piston unit 10 together with the cylinder 12 and the cylinder cover 15. The adjusting piston 9 is shown in FIG. 1 in a central position, in which the adjusting piston 9 divides the cylinder 12 into two pressure chambers 13 and 14. The piston rod 8 extends from the adjusting piston 9 through the upper pressure chamber 14 and the cylinder cover 15, which delimits the housing 11 and the cylinder 12 upwards. A rod seal 16 is provided on the cylinder cover 15, which surrounds the piston rod 8 and seals the upper pressure chamber 14 from the surroundings. The two piston seals 17, 18 arranged on the adjusting piston 9 seal the adjusting piston 9 from the cylinder 12 and thus also the pressure chambers 13, 14 from one another. The underside 19 of the cylinder cover 15 forms an upper stop, against which the adjusting piston 9 rests in the upper position, the long position of the length-adjustable connecting rod 1, while in the lower position (short position) of the length-adjustable connecting rod 1, the adjusting piston 9 on the Cylinder base 20 trained lower stop abuts.
    / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    The hydraulic control device 21 for supplying the adjustment device formed by the cylinder-piston unit 10 is explained in more detail below with reference to the hydraulic circuit shown in FIG. 3. The two pressure chambers 13, 14 are each connected to the engine oil circuit of the piston engine via separate hydraulic medium lines 22, 23 and separate check valves 24, 25 and a common oil supply channel 26 which opens into the large connecting rod eye 4. If the length-adjustable connecting rod 1 is in the long position, there is no engine oil in the upper pressure chamber 14, while the lower pressure chamber 13 is completely filled with engine oil. During operation, the connecting rod 1 is alternately subjected to tension and pressure due to the mass and gas forces. In the long position, the tensile force is absorbed by the mechanical contact of the adjusting piston 9 with the underside 19 of the cylinder cover 15. The length of the connecting rod 1 does not change. An acting pressure force is transmitted via the piston surface to the lower pressure chamber 13 filled with engine oil. Since the check valve 25 assigned to the lower pressure chamber 13 prevents the engine oil from flowing out, the pressure of the engine oil rises sharply and prevents a change in the connecting rod length. As a result, the length-adjustable connecting rod 1 is hydraulically locked in this direction of movement. In the short position of the length-adjustable connecting rod 1, the situation reverses. The lower pressure chamber 13 is completely empty and a pressure force is absorbed by the mechanical stop of the adjusting piston 9 on the cylinder base 20, while the upper pressure chamber 14 is filled with engine oil, so that a pulling force on the length-adjustable connecting rod 1 causes a pressure increase in the upper pressure chamber 14 and so that hydraulic locking causes.
    The connecting rod length of the length-adjustable connecting rod 1 shown here can be adjusted in two stages by emptying one of the two pressure chambers 13, 14 and filling the other pressure chambers 13, 14 with engine oil. For this purpose, one of the check valves 24, 25 is bridged by the hydraulic control device 21, so that the engine oil can flow out of the previously filled pressure chamber 13, 14. The respective check valve 24, 25 loses its effect. For this purpose, the hydraulic control device 21 comprises a control valve 34, which is shown here as a 4/2-way valve 27, the two switchable connections 30 of which are each connected via a throttle 28, 29 to one of the hydraulic medium lines 22, 23 and also to one of the pressure chambers 13, 14 are connected. The 4/2-way valve 27 is actuated by the pressure of the engine oil, which is supplied to the 4/2-way valve 27 via a control pressure line 31 connected to the oil supply channel 26. The 4/2-way valve 27 is reset by a return spring 39. The one connected to the upper pressure chamber 14/24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Port 30 of the 4/2-way valve 27 (first drain valve 41) is connected to the oil supply channel 26 of the hydraulic control device 21, so that the engine oil discharged from the upper pressure chamber 14 can be used directly via the oil supply channel 26 to fill the lower pressure chamber 13. In this preferred position of the 4/2-way valve 27 shown in FIG. 3, the first drain valve 41 is thus opened. The connection 30 of the 4/2-way valve 27 (second drain valve 42) coupled to the lower pressure chamber 13 is blocked in the illustration of the hydraulic fluid circuit shown in FIG. 3, so that engine oil flows into the hydraulically blocked lower pressure chamber 13 via the check valve 25 and filled the pressure chamber 13. In the open position of the second drain valve 42, the connection 30 of the 4/2-way valve 27 coupled to the lower pressure chamber 13 is connected to a non-pressurized drain channel 32, via which the engine oil discharged from the lower pressure chamber 13 directly to the surroundings of the length-adjustable connecting rod 1 is dissipated.
    In the 4/2-way valve 27 in FIG. 3, one of the switchable connections 30 is opened so that the associated pressure chamber 13, 14 is emptied, while the other connection 30 is closed and hydraulically blocks the associated pressure chamber 13, 14. If the switching position of the 4/2-way valve 27 is changed by applying a higher control pressure via the control pressure line 31 connected to the oil supply channel 26 or by resetting the 4/2-way valve 27 by means of the return spring 39 when the control pressure decreases, this will be the case so far opened connection 30 closed and the previously closed connection 30 opened. As a result, in a previously long position of the length-adjustable connecting rod 1, the high-pressure engine oil flows from the lower pressure chamber 13 previously filled with engine oil via the hydraulic medium line 23 and the associated throttle 29 through the opened connection 30 of the 4/2-way valve 27 and the Drain channel 32 to the surroundings of the length-adjustable connecting rod 1. When the connecting rod 1 is initially in a short position, the pressurized engine oil flows from the upper pressure chamber 14, which was previously filled with engine oil, via the hydraulic medium line 22, the associated throttle 28 and the opened connection 30 of FIG. 2-way valve 27 into the oil supply channel 26, see FIG. 3. Since the lower pressure chamber 13 is simultaneously filled with engine oil via the oil supply channel 26, the check valve 25 and the hydraulic medium line 23 when the upper pressure chamber 14 is emptied, the majority of the discharged flows Motor oil directly in the u lower pressure chamber 13.
    During the length change of the connecting rod 1 due to the switching process of the hydraulic control device 21, the / 24 arises in a piston engine during the stroke movement
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Connecting rod 1 acting mass and gas forces in the previously empty pressure chamber 13, 14 a suction effect, through which the associated check valve 24, 25 opens, so that the previously empty pressure chamber 13, 14 fills with engine oil. With increasing emptying of the previously filled pressure chamber 13, 14 via the opened connection 30, engine oil is increasingly supplied to the other pressure chamber 13, 14, as a result of which the length of the connecting rod 1 changes. Depending on the design of the length-adjustable connecting rod 1 and the hydraulic control device 21 and the operating state of the piston engine, several strokes of the connecting rod 1 may be required until the pressure chamber 13, 14 blocked by the hydraulic control device 21 is completely filled with engine oil and the other open pressure chamber 13, 14 is completely emptied and the maximum possible change in length of the connecting rod 1 is achieved.
    The hydraulic control device 21 shown in FIG. 1 has a hydraulic control valve 34 designed as a simple slide valve with a cylindrical control slide 35 which is displaceable in a control cylinder 36.
    1 and 2, the axis of movement of the control slide 35 is shown to run essentially normal to the longitudinal direction A of the connecting rod 1 and normal to the longitudinal axis of the crankshaft (not shown). Accordingly, the control slide 35 moves in a plane that runs through the longitudinal direction A of the connecting rod 1 and normal to the longitudinal axis of the crankshaft, that is to say essentially lies in the leaf plane of FIGS. 1 and 2. It is pointed out that different directions of movement of the control slide 35 are also possible, e.g. in the plane described, but at an oblique angle to the longitudinal axis A of the connecting rod, in a direction parallel to the longitudinal axis of the crankshaft or obliquely to the longitudinal axis A of the connecting rod 1. For reasons of clarity, these directions are in the figures not shown.
    The control slide 35 has a centrally arranged control piston 37 which, together with the control cylinder 36, forms a control pressure chamber 38 supplied by the control pressure line 31. On the side of the control piston 37 facing away from the control pressure chamber 38, a return spring 39 is arranged in a drained low-pressure chamber 33, which returns the control piston 37 to its unloaded starting position when the pressure of the hydraulic medium in the control pressure chamber 38 decreases. In the direction of the control spool axis of the control spool 35, two control tappets 40 protrude at the end of the control piston 37, which act on two drain valves 41, 42 arranged coaxially to the control spool axis. Here are / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG designed the control plunger 40 so that, depending on the position of the control piston 37, a (first) drain valve 41 is open, while the opposite (second) drain valve 42 is closed. When the hydraulic control pressure in the control pressure chamber 38 is high, the control piston 37 is pushed against the biasing force of the return spring 39 in the direction of the second drain valve 42. The control plunger 40 presses the spring-loaded spherical valve body 43 out of a valve seat 44. As a result, the hydraulic medium flows from the lower pressure chamber 13 via the hydraulic medium line 23 into the opened drain valve 42 and from there via the pressureless discharge channel 32 directly to the surroundings of the length-adjustable connecting rod 1. At a low control pressure in the control pressure chamber 38, the control piston 37 is pressed by the return spring 39 in the direction of the first drain valve 41, so that the second drain valve 42 closes again. The control tappet 40 protruding in the direction of the first drain valve 41 then presses the valve body 43 out of the valve seat 44 in the first drain valve 41, so that the engine oil located in the upper pressure chamber 14 flows through the hydraulic medium line 22 into the drain valve 41 and from there into the oil supply channel 26 , Since at the same time the lower pressure chamber 13 fills with engine oil again via the connection of the oil supply channel 26 and the check valve 24 of the hydraulic control device 21, engine oil flows from the upper pressure chamber 14 via the oil supply channel 26 directly into the lower pressure chamber
    13. As shown in FIG. 3, the connections 30 of the hydraulic medium lines 22, 23 on the drain valves 41, 42 can be throttled in order to prevent the engine oil from flowing out of the pressure chambers 13, 14 too quickly and in an uncontrolled manner.
    2 shows a section through a length-adjustable connecting rod 1 with another variant of the control valve 34. The structure of the actual control valve 34 is very similar to the embodiment shown in FIG. 1, which is why it will not be discussed in detail here. In contrast to the embodiment shown in FIG. 1, the drain valves 41, 42 are not arranged coaxially to the spool axis, but perpendicular to it. As shown in FIG. 2, the spherical valve body 43 of the first drain valve 41 is pressed out of the valve seat 44 by the control tappet 40 projecting in the direction of the first drain valve 41. Through this opened drain valve 41, the engine oil flows from the upper pressure chamber 14 via the hydraulic medium line 22 and through the drain valve 41 into the oil supply channel 26. The radial arrangement of the two drain valves 41, 42 in this embodiment allows the drain channel 32 assigned to the second drain valve 42 in Direction of the spool axis and be correspondingly short and not angled. With an increasing hydraulic control pressure in the control pressure chamber 38 of the control valve 34, / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co.KG, which is again supplied with engine oil via the control pressure line 31 from the oil supply channel 26 connected to the large connecting rod eye 4, the engine oil presses the control piston 37 against the bias of the return spring 39 in the direction of the second Drain valve 42, so that the first drain valve 41 closes again and the control tappet 40 protruding in the direction of the second drain valve 42 opens the second drain valve 42. The chamfered end of the control tappet 40 presses the spherical valve body 43 from its valve seat 44 into the second drain valve 42 and opens the lower pressure chamber 13, so that the engine oil from the lower pressure chamber 13 via the hydraulic medium line 23, the second drain valve 42 and the coaxial to the spool axis extending overpressure-free drainage channel 32 flows to the surroundings of the length-adjustable connecting rod 1.
    / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    List of reference symbols length-adjustable connecting rod lower connecting rod part upper connecting rod part
    connecting rod
    bearing shell
    small end
    connecting rod
    piston rod
    adjusting piston
    Cylinder-piston unit
    casing
    cylinder
    pressure chamber
    pressure chamber
    cylinder cover
    rod seal
    piston seal
    piston seal
    bottom
    Cylinder bottom hydraulic control device
    Hydraulic medium line
    Hydraulic medium line
    check valve
    Check valve / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Oil supply channel
    4/2-way valve
    throttle
    throttle
    connections
    Control pressure line
    spillway
    Low-pressure chamber
    spool valve
    spool
    control cylinder
    spool
    Control pressure chamber
    Return spring
    control tappet
    drain valve
    drain valve
    valve body
    valve seat
    Longitudinal direction / 24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    权利要求:
    Claims (10)
    [1]
    Expectations
    1. Length-adjustable connecting rod (1) for a piston engine, the connecting rod (1) having a first connecting rod eye (7) for receiving a piston pin and a second connecting rod eye (4) for receiving a crankshaft pin, the distance between the piston pin and the crankshaft pin in The longitudinal direction (A) of the connecting rod (1) can be adjusted by means of a hydraulic control device (21) with a hydraulic control valve (34) and the hydraulic control valve (34) is a control cylinder (36), which can be displaceably guided in the control cylinder (36) and can be pressurized Control spool (35) and two drain valves (41, 42) which can be actuated by the control spool (35), characterized in that a first drain valve (41) is connected to an oil supply channel (26), around the hydraulic medium flowing out of a first pressure chamber (14) to fill a second pressure chamber (13) and to provide a second drain valve (42) with a non-pressurized drain channel (32) is connected to the hydraulic fluid flowing out of the second pressure chamber (13) of the length-adjustable connecting rod (1) to the environment.
    [2]
    2. Length-adjustable connecting rod (1) according to claim 1, characterized in that the two drain valves (41, 42) can be actuated alternately by the control slide (35).
    [3]
    3. Length-adjustable connecting rod (1) according to claim 1 or 2, characterized in that the hydraulic control valve (34) has a return spring (39) to hold the control slide (35) in a first starting position or to reset to the first starting position, wherein the return spring (39) is preferably arranged around the control slide (35).
    [4]
    4. Length-adjustable connecting rod (1) according to one of claims 1 to 3, characterized in that the control slide (35) has a centrally arranged control piston (37), the two drain valves (41, 42) on both sides of the in the direction of one Control spool axis movable control piston (37) are arranged.
    [5]
    5. Adjustable connecting rod (1) according to claim 4, characterized in that the two drain valves (41, 42) are arranged coaxially to the spool axis and / or that the two drain valves (41, 42) are inclined to the spool axis, preferably perpendicular to the spool axis ,
    18/24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    [6]
    6. Length-adjustable connecting rod (1) according to one of claims 1 to 3, characterized in that the control slide (35) has a control piston (37) which is arranged at a first end of the control slide (35) and one at a second end of the Control spool (35) arranged switching contour, the two drain valves (41,42) can be actuated alternately by means of the switching contour.
    [7]
    7. Length-adjustable connecting rod (1) according to one of claims 1 to 6, characterized in that two connecting rod parts (2, 3) are provided, the first connecting rod part (3), the first connecting rod eye (7) and the second connecting rod part (2) has second connecting rod eye (4) and the first connecting rod part (3) for adjusting the distance between the piston pin and the crankshaft journal relative to the second connecting rod part (2) in the longitudinal direction (A) of the connecting rod (1) is movable, preferably telescopically.
    [8]
    8. Length-adjustable connecting rod (1) according to claim 7, characterized in that at least one with the hydraulic control device (21) hydraulically connected cylinder-piston unit (10) is provided to the first connecting rod part (3) relative to the second connecting rod part (2 ) to move, the first connecting rod part (3) being connected to an adjusting piston (9) of the cylinder-piston unit (10) and the second connecting rod part (2) having a cylinder bore (12) of the cylinder-piston unit (10) ,
    [9]
    9. Use of a length-adjustable connecting rod (1) with a hydraulic control valve (34) in a piston engine, the hydraulic control valve (34) of the control device (21) having a control cylinder (36), one displaceably guided in the control cylinder (36), with pressure Actuating slide valve (35) and at least two drain valves (41, 42), a first drain valve (41) being connected to an oil supply channel (26) in order to fill the hydraulic medium flowing out of a first pressure chamber (14) for filling a second pressure chamber (13 ), and a second drain valve (42) is connected to a non-pressurized drain channel (32) in order to discharge the hydraulic fluid flowing out of the second pressure chamber (13) of the length-adjustable connecting rod (1) to the environment.
    [10]
    10. Piston engine with at least one engine cylinder, a reciprocating piston moving in the engine cylinder and at least one adjustable compression ratio in the engine cylinder, and with a length-adjustable connecting rod (1) connected to the reciprocating piston according to one of claims 1 to 8.
    19/24
    PP32167AT
    AVL List GmbH iwis motorsysteme GmbH & Co. KG
    1.3

    20/24
    PP32167AT
    AVL List GmbH iwis motorsysteme GmbH & Co. KG
    2.3

    21/24
    PP32167AT
    AVL List GmbH iwis motorsysteme GmbH & Co. KG

    22/24
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Expectations
    1. Length-adjustable connecting rod (1) for a piston engine, the connecting rod (1) having a first connecting rod eye (7) for receiving a piston pin and a second connecting rod eye (4) for receiving a crankshaft pin, the distance between the piston pin and the crankshaft pin in The longitudinal direction (A) of the connecting rod (1) can be adjusted by means of a hydraulic control device (21) with a hydraulic control valve (34) and the hydraulic control valve (34) is a control cylinder (36), which can be displaceably guided in the control cylinder (36) and can be pressurized Control spool (35) and two drain valves (41, 42) which can be actuated by the control spool (35), characterized in that a first drain valve (41) is connected to an oil supply channel (26), around the hydraulic medium flowing out of a first pressure chamber (14) to fill a second pressure chamber (13) and to provide a second drain valve (42) with a non-pressurized drain channel (32) is connected to the hydraulic fluid flowing out of the second pressure chamber (13) of the length-adjustable connecting rod (1) to the environment.
    2. Length-adjustable connecting rod (1) according to claim 1, characterized in that the two drain valves (41, 42) can be actuated alternately by the control slide (35).
    3. Length-adjustable connecting rod (1) according to claim 1 or 2, characterized in that the hydraulic control valve (34) has a return spring (39) to hold the control slide (35) in a first starting position or to reset to the first starting position, wherein the return spring (39) is preferably arranged around the control slide (35).
    4. Length-adjustable connecting rod (1) according to one of claims 1 to 3, characterized in that the control slide (35) has a centrally arranged control piston (37), the two drain valves (41, 42) on both sides of the in the direction of one Control spool axis movable control piston (37) are arranged.
    5. Adjustable connecting rod (1) according to claim 4, characterized in that the two drain valves (41, 42) are arranged coaxially to the spool axis and / or that the two drain valves (41, 42) are inclined to the spool axis, preferably perpendicular to the spool axis ,
    23/24 [LAST PRODUCED CLAIMS)
    PP32167AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    6. Length-adjustable connecting rod (1) according to one of claims 1 to 3, characterized in that the control slide (35) has a control piston (37) which is arranged at a first end of the control slide (35) and one at a second end of the Control spool (35) arranged switching contour, the two drain valves (41,42) can be actuated alternately by means of the switching contour.
    7. Length-adjustable connecting rod (1) according to one of claims 1 to 6, characterized in that two connecting rod parts (2, 3) are provided, the first connecting rod part (3), the first connecting rod eye (7) and the second connecting rod part (2) has second connecting rod eye (4) and the first connecting rod part (3) for adjusting the distance between the piston pin and the crankshaft journal relative to the second connecting rod part (2) in the longitudinal direction (A) of the connecting rod (1) is movable, preferably telescopically.
    8. Length-adjustable connecting rod (1) according to claim 7, characterized in that at least one with the hydraulic control device (21) hydraulically connected cylinder-piston unit (10) is provided to the first connecting rod part (3) relative to the second connecting rod part (2 ) to move, the first connecting rod part (3) being connected to an adjusting piston (9) of the cylinder-piston unit (10) and the second connecting rod part (2) having a cylinder bore (12) of the cylinder-piston unit (10) ,
    9. Use of a length-adjustable connecting rod (1) with a hydraulic control valve (34) in a piston engine, the hydraulic control valve (34) of the control device (21) having a control cylinder (36), one displaceably guided in the control cylinder (36), with pressure Actuating slide valve (35) and at least two drain valves (41, 42), a first drain valve (41) being connected to an oil supply channel (26) in order to fill the hydraulic medium flowing out of a first pressure chamber (14) for filling a second pressure chamber (13 ), and a second drain valve (42) is connected to a non-pressurized drain channel (32) in order to discharge the hydraulic fluid flowing out of the second pressure chamber (13) of the length-adjustable connecting rod (1) to the environment.
    10. Piston engine with at least one engine cylinder, a reciprocating piston moving in the engine cylinder and at least one adjustable compression ratio in the engine cylinder, and with a length-adjustable connecting rod (1) connected to the reciprocating piston according to one of claims 1 to 8.
    24/24 (LAST CLAIMS!
    类似技术:
    公开号 | 公开日 | 专利标题
    AT513054A1|2014-01-15|Length adjustable connecting rod
    AT512334A1|2013-07-15|Length adjustable connecting rod
    AT519290B1|2019-02-15|Length adjustable connecting rod with a cylinder-piston unit with oil filter
    AT518848A1|2018-01-15|Connecting rod with adjustable connecting rod length with mechanical actuation
    WO2018083256A1|2018-05-11|Adjustable-length connecting rod having a piston/cylinder unit having cylinder sleeve
    AT521606B1|2020-03-15|Hydraulic valve mechanism for adjustable connecting rod
    AT521256B1|2019-12-15|Hydraulic control valve for a length-adjustable connecting rod with split drainage
    AT521269B1|2019-12-15|Hydraulic control valve for a length-adjustable connecting rod with two control pressure chambers
    AT521268B1|2019-12-15|Length-adjustable connecting rod with hydraulic control device
    AT519802B1|2019-05-15|Valve mechanism for a length-adjustable connecting rod
    AT519303B1|2019-06-15|Connecting rod with stepped piston
    AT521675B1|2020-04-15|Hydraulic control valve for a length-adjustable connecting rod with two control pistons on the front
    AT521159B1|2019-11-15|Hydraulic control valve for a length-adjustable connecting rod with an end control spool
    AT521146B1|2019-11-15|Hydraulic control valve for a length-adjustable connecting rod with a hollow slide
    AT522793B1|2021-02-15|Compact hydraulic valve mechanism for a length-adjustable connecting rod
    AT522570B1|2020-12-15|Hydraulic valve mechanism with throttle bore
    AT521676B1|2020-04-15|Length-adjustable connecting rod with mechanically operated valve
    AT522194B1|2020-12-15|Control slide with separate control piston for a length-adjustable connecting rod
    AT519293B1|2019-02-15|Length adjustable connecting rod with a cylinder-piston unit with oil guide rod
    AT519300B1|2019-04-15|Length adjustable connecting rod with cylinder-piston unit with gap seal and elastic piston collar
    AT519307B1|2019-01-15|Length adjustable connecting rod with a cylinder-piston unit with conical gap seal
    AT519294B1|2018-12-15|Length adjustable connecting rod with a cylinder-piston unit with cylinder sleeve
    AT519306B1|2019-01-15|Length adjustable connecting rod with a cylinder-piston unit with gap seal, oil reservoir, oil filter and oil scraper
    AT522160A4|2020-09-15|Control slide for a longitudinally adjustable connecting rod
    同族专利:
    公开号 | 公开日
    CN111006058A|2020-04-14|
    AT521256B1|2019-12-15|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    EP1426584A1|2002-11-27|2004-06-09|FEV Motorentechnik GmbH|Connecting rod for reciprocating piston machine with variable adjustable compression ratio|
    DE102005055199A1|2005-11-19|2007-05-24|Fev Motorentechnik Gmbh|Reciprocating internal combustion engine e.g. commercial vehicle diesel engine, has eccentric tappet moved along length of piston rod, where changeable resistor affects adjustment movement of tappet and effects adjustment movement of tappet|
    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|
    AT518563A1|2016-04-29|2017-11-15|Avl List Gmbh|LENGTH-ADJUSTABLE CONNECTING ROD|
    WO2017207070A1|2016-05-31|2017-12-07|Avl List Gmbh|Longitudinally adjustable connecting rod comprising a hydraulically actuated control device and an electromagnetically actuated switching valve, reciprocating piston engine, and vehicle|
    WO2018060457A1|2016-09-30|2018-04-05|Avl List Gmbh|Length-adjustable connecting rod with control device|
    DE102017104391A1|2017-03-02|2018-09-06|Schaeffler Technologies AG & Co. KG|Switching device for controlling an adjusting device and connecting rod for a reciprocating internal combustion engine with such a switching device|
    CN105952547A|2016-06-16|2016-09-21|徐州弦波引擎机械科技有限公司|Length-variable engine piston|
    AT519140B1|2016-09-30|2018-11-15|Avl List Gmbh|Length adjustable connecting rod with mechanical adjustment|
    DE102016120975A1|2016-11-03|2018-05-03|Avl List Gmbh|Length adjustable connecting rod with a cylinder-piston unit with oil filter|AT521268B1|2018-10-08|2019-12-15|Avl List Gmbh|Length-adjustable connecting rod with hydraulic control device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    ATA50868/2018A|AT521256B1|2018-10-08|2018-10-08|Hydraulic control valve for a length-adjustable connecting rod with split drainage|ATA50868/2018A| AT521256B1|2018-10-08|2018-10-08|Hydraulic control valve for a length-adjustable connecting rod with split drainage|
    CN201910948843.7A| CN111006058A|2018-10-08|2019-10-08|Hydraulic control valve with a separate displacement guide and a length-adjustable connecting rod|
    [返回顶部]