• 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 present invention relates to a length-adjustable connecting rod (1) for an internal combustion engine, wherein the connecting rod (1) at least one switchable discharge valve (24, 25) for opening and closing a pressure chamber (11, 12), wherein the discharge valve (24, 25) a valve body (29) and with the valve body (29) operatively connected closing body (32) and on the closing body (32) has a closing mechanism for directly moving the closing body (32) and indirectly moving the valve body (29) from a closing in a Open position or vice versa is available. Such a drain valve (24, 25) should be designed to be functional. For this purpose, the closing body (32) has a mass which is less than the volume predetermined by the envelope contour of the closing body (32) multiplied by the density of steel (7.85 g / mm.sup.3). Furthermore, the invention relates to the use of such a closing body (32) in a corresponding length-adjustable connecting rod (1).
    公开号:AT521160A4
    申请号:T508662018
    申请日:2018-10-08
    公开日:2019-11-15
    发明作者:Heller Malte；Kai Arens Dr；Riba Zóltan；Bodensteiner Martin；Latz Steffen；Ing Bernhard Kometter Dipl；St John Robert；Greylinger Wilhelm；Ing Heinrich Fürhapter Dipl；Siegfried Lösch Dr
    申请人:Avl List Gmbh；Iwis Motorsysteme Gmbh & Co Kg；
    IPC主号:
    专利说明:

    Summary
    The connecting rod (1) for an internal combustion engine is adjustable in length, the connecting rod (1) having at least one switchable drain valve (24, 25) for opening and closing a pressure chamber (11, 12), the drain valve (24, 25) has a valve body (29) and a closing body (32) operatively connected to the valve body (29) and on the closing body (32) a closing mechanism for direct movement of the closing body (32) and indirect movement of the valve body (29) from one closing to one Open position or vice versa is present. Such a drain valve (24, 25) should be designed to be functional. For this purpose, the closing body (32) has a mass that is less than the volume specified by the envelope contour of the closing body (32) multiplied by the density of steel (7.85 g / mm 3 ). The invention also relates to the use of such a closing body (32) in a corresponding length-adjustable connecting rod (1).
    Fig. 3/22
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Length-adjustable connecting rod with reduced-mass drain valve
    The present invention relates to a length-adjustable connecting rod for an internal combustion engine, the connecting rod having at least one switchable drain valve for opening and closing a pressure chamber, the drain valve having a valve body and a closing body that is operatively connected to the valve body and a closing mechanism that acts on the closing body for direct movement of the Closing body and indirect movement of the valve body from a closed to an open position or vice versa is present.
    The thermal efficiency η of gasoline engines depends on the compression ratio ε, i.e. the ratio of the total volume before compression to the compression volume (ε = (stroke volume Vh + compression volume Vc) / compression volume Vc). The thermal efficiency increases as the compression ratio increases. The increase in thermal efficiency via the compression ratio is degressive, but is still relatively pronounced in the range of today's values (ε = 10 ... 14).
    In practice, the compression ratio cannot be increased arbitrarily. For example, too high a compression ratio in gasoline engines leads to knocking. The mixture ignites due to the pressure and temperature increase during compression and not due to the ignition spark. This premature combustion not only leads to uneven running, but can also cause component damage
    The compression ratio from which knocking occurs is, among other things. depending on the operating point (n, T, throttle valve position) of the engine. A higher compression is possible in the partial load range. Therefore, there is an effort to adapt the compression ratio to the respective operating point. There are different development approaches. In the present case, the compression ratio should be adjusted by the connecting rod length. The connecting rod length affects the compression volume. The stroke volume is determined by the position of the crankshaft journal and the cylinder bore. A short connecting rod therefore leads to a lower compression ratio than a long connecting rod with otherwise the same geometrical dimensions (crankshaft, cylinder head, valve control, etc.).
    In the present case, the connecting rod length should vary hydraulically between two positions, so the connecting rod is adjustable in length. The mode of operation of an embodiment is briefly explained below. The entire connecting rod is made up of several parts, with the length 2/22
    PP32165AT AVL List GmbH, iwis motorsysteme GmbH & Co. KG by means of a telescopic mechanism. The connecting rod contains a double-acting hydraulic cylinder. The small connecting rod eye (piston pin) is connected to a piston rod on which a piston is arranged. The piston is guided axially displaceably in a cylinder which is arranged in the connecting rod part with the large connecting rod eye (crankshaft journal). The piston separates the cylinder into two chambers (upper and lower pressure chamber). The two chambers are connected with a hydraulic fluid, e.g. Engine oil supplied. If the connecting rod is in the long position, there is no oil in the upper pressure chamber. The lower pressure chamber, however, is completely filled with oil. During operation, the connecting rod is subjected to alternating tensile and compressive loads due to the gas and mass forces. In the long position, a tensile force is absorbed by the mechanical contact with an upper stop of the piston. This does not change the connecting rod length. An acting pressure force is transferred to the oil-filled lower chamber via the piston surface. Since the check valve in this chamber prevents oil return, the oil pressure rises. The connecting rod length does not change. The connecting rod is hydraulically locked in this direction.
    In the short position, the situation is reversed. The lower chamber is empty, the upper one is filled with oil. A tensile force causes an increase in pressure in the upper chamber. A compressive force is absorbed by a mechanical stop.
    The connecting rod length can be adjusted in two stages by emptying one of the two chambers. Here, one of the two inlet check valves is bridged by an assigned return channel. Oil can flow through this return channel, regardless of the pressure difference between the pressure chamber and the supply part. The respective check valve loses its effect.
    The two return channels are opened or closed by a control valve, with exactly one return channel always being open and the other closed. The actuator for switching the two return channels is controlled hydraulically by the supply pressure. The oil supply is provided by the lubrication of the connecting rod bearing. This requires an oil feed-through from the crankshaft journal via the connecting rod bearing to the connecting rod.
    The switching is carried out by deliberately emptying one of the two pressure chambers using the mass and gas forces acting on the connecting rod, the other pressure chamber being supplied with oil and hydraulically blocked by an inlet check valve.
    / 22nd
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    A connecting rod that is length-adjustable via telescoping to adjust the compression ratio in the internal combustion engine describes e.g. WO 2018/007534 A1. In a variant of this known publication, an actuating piston is provided which controls the drain valves for the pressure chambers. For this purpose, the valve body (spherical shape) has plunger-shaped closing bodies which can be opened and closed by means of a control plunger on the actuating piston. A change in the compression ratio can also be effected by means of an eccentric on the small connecting rod eye. The eccentric can also be controlled hydraulically.
    A connecting rod is naturally exposed to very high acceleration forces. These acceleration forces must also be taken into account when hydraulically switching a length-adjustable connecting rod. There is therefore an effort to construct parts of the hydraulic circuit, here the drain valve, so that a functional unit is created during the operation of the internal combustion engine.
    It is therefore the object of the present invention to improve a length-adjustable connecting rod of the type mentioned at the outset in such a way that a fully functional drain valve is created even with the small space available.
    This object is achieved according to the invention in that the closing body has a mass which is less than the volume specified by an envelope contour of the closing body multiplied by the density of steel (7.85 g / mm 3 ). The envelope contour essentially means the smallest packaging contour, which only follows the outer contour of the closing body and does not take into account recesses, grooves, bores, etc., provided that it is flanked by an adjacent, larger area of the closing body. As a rule, however, closing bodies are simple geometric components. In addition to the use of targeted material removal or the formation of a hollow body, weight can also be reduced by using a material with a lower density than steel. Depending on the orientation of the drain valve, an opening force can be exerted on the valve body by the closing body when the connecting rod rotates and depending on the speed of the internal combustion engine. In the closed position of the valve body, this should not lead to an unintentional switching of the drain valve. A lower weight of the closing body is achieved by the solution according to the invention, / 22
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG so that the circumstances are all the more advantageous and a valve spring that may be present can be designed the better. The force of the closing body acting on the closing mechanism is also reduced by this measure.
    It has proven to be particularly advantageous if, according to a variant, the closing body is made from a ceramic material. Technical ceramic materials are very solid materials that can withstand the high requirements in the field of application at hand. In addition, they have a lower density than steel, which is why training as a solid material is also possible. Such closing bodies can e.g. also by sintering and in any shape.
    The closing body advantageously consists of a material with an average density of less than 4.5 g / mm 3 , preferably less than 2.7 g / mm 3 . With ceramic materials in particular, such limit values can be maintained, which in the present case are specified by the material titanium and the material aluminum, which are generally less suitable materials for the present application. Due to the fact that the mass of the closing body is generally smaller than the mass of the valve body, with such a mass reduction the closing body exerts little influence on the valve body with corresponding accelerations. The influence on the locking mechanism is also reduced.
    It has been found to be particularly advantageous for the construction if the valve body and the closing body are two separate bodies. Here geometrically simple bodies, e.g. two balls are used. The valve body and / or the closing body preferably have a spherical shape.
    The spherical shape has the smallest volume with the largest possible surface, so that this body has a favorable shape and is preferably used. The interaction of two balls is considered manageable and advantageous for the outflow of the hydraulic fluid.
    Spherical valve bodies are well known and easy to control. A flowing closing fluid flows around a spherical closing body and therefore, in addition to its small volume, also has good hydraulic properties. The closing body is usually arranged on the low pressure side and is thus exposed to the drain flow of the drain valve.
    / 22nd
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    In another variant, the closing body is connected to the closing section of the valve body on the low-pressure side and is engaged there with the closing mechanism and / or can be brought into engagement there with the closing mechanism. The closing body can then be made in one piece with the valve body. The determination of the envelope contour of the closing body is generally very simple because the closing body is usually attached to the valve body as an extension and must extend through the valve opening. The valve body definitely includes the closing area that sits on the valve seat. The part that then physically separates from it and extends through the valve opening is then attributed to the closing body. The connection of the valve body and the closing body offers other options for designing the closing mechanism, because it is not necessary to secure the closing body when the drain valve is closed.
    So that the mass of the closing body has little effect on the valve body, the envelope volume of the valve body is preferably larger than the envelope volume of the closing body.
    Furthermore, it has been found that the acceleration acting on the drain valve can be handled most favorably if, according to one variant, the closing axis of the valve body of the drain valve is oriented at an angle of ± 45 ° to the axis of the crankshaft driving the connecting rod. In other words, the closing axis of the valve body of the drain valve is oriented inclined to the axis of the crankshaft driving the connecting rod, the angle of inclination being in an angular range between -45 ° and + 45 °. Aligning the locking axis exactly 90 ° to the crankshaft axis can lead to disadvantages during operation. This is to be avoided and the appropriate use of the specified area ensures lower inertia forces.
    It is therefore preferred according to a further variant if the closing axis of the valve body of the drain valve is aligned essentially parallel to the axis of the crankshaft driving the connecting rod. The orientation of the valve seat and the design of the valve body must certainly also be taken into account here. As a rule, however, the influences due to the accelerations on the connecting rod occurring during operation are minimized with this alignment.
    According to an advantageous design specification (in particular according to a specification according to claim 8), the drain valve can have a valve spring pressing the valve body against a valve seat, the spring biasing force of the valve spring thus being at a standstill
    PP32165AT AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    The connecting rod is selected so that the force calculated from normal operation and the acceleration occurring at the valve body multiplied by the mass of the valve body and divided by the tangent α is smaller than the spring preload force, where α is the angle between the tangent of the valve seat on the valve body and a perpendicular to the closing axis of the drain valve. To determine the angle α, the contact tangent and the closing axis must of course be in one plane. This specification ensures that the spring force during operation is sufficient to keep the closed drain valve closed.
    Furthermore, the invention relates to the use of a closing body for a length-adjustable connecting rod in one of the embodiments described above. The closing body has a mass which is less than the volume specified by the envelope contour of the closing body multiplied by the density of steel (7.85 g / mm 3 ). Such advantageous closing bodies simplify the design of a drain valve and the associated closing mechanism for a telescopic connecting rod.
    The present invention is explained in more detail below on the basis of a non-restrictive exemplary embodiment which is illustrated in the drawings. Show it:
    1 shows the schematic functional representation of a length-adjustable, in particular telescopic, connecting rod,
    2 is a front view of an embodiment of a telescopic connecting rod,
    Fig. 3 is an enlarged section of the telescopic connecting rod from Fig. 2 cut along the line III-III and
    Fig. 4 is a schematic representation of the force relationship on the valve body of a drain valve.
    In Fig. 1, a length-adjustable, telescopic connecting rod 1 is shown schematically and by way of example, with which a variable compression ratio in an internal combustion engine can be realized. The connecting rod 1 has a displaceably arranged rod part 2, at the upper end of which a small connecting rod eye 3 is arranged. The second rod part 4 has a lower bearing shell 5 which, together with the lower region of the second rod part 4, surrounds the large connecting rod eye 6. The lower bearing shell 5 and the upper region of the second rod part 4 are fastened in the usual way by means of fastening means 7 (see FIG. 2) / 22
    PP32165AT AVL List GmbH, iwis motorsysteme GmbH & Co. KG linked together. The lower end of the first rod part 2 is provided with an adjusting piston 8, which is guided displaceably in a piston bore 9. At the upper end, the second rod part 4 has a cover 10 through which the first rod part 2 is guided and sealed. The cover 10 thus seals the piston bore 9 as a whole. A first pressure chamber 11 of circular cross section is formed below the adjusting piston 8 and an annular second pressure chamber 12 is formed above the adjusting piston 8. Of course, other cross-sectional shapes, e.g. Ellipses, polygons or polygons are implemented.
    The adjusting piston 8 and the piston bore 9 are part of an adjusting mechanism for changing the connecting rod length. The adjusting mechanism also includes a hydraulic control circuit 13 to be described in more detail, which accordingly ensures that hydraulic fluid flows in and out of the pressure chambers 11 and 12 and thus moves the adjusting piston 8 or locks the adjusting piston 8. The hydraulic control circuit 13 is operated with engine oil in the illustrated embodiment. For this purpose, an oil supply channel 14 is connected to the large connecting rod eye 6, as a result of which engine oil can be supplied to the hydraulic control circuit 13 or possibly flows out of it. The oil supply channel 14 branches into different lines (sub-channels). A first line 15 is connected to the first pressure chamber 11 in order to ensure an inflow of engine oil into the first pressure chamber 11. In addition, there is a first check valve 16 in the first line 15, which is intended to prevent an immediate outflow of the oil from the first pressure chamber 11, but allows an inflow into the first pressure chamber 11 at any time. A second line 17 is connected to the second pressure chamber 12 in order to allow oil to flow into the second pressure chamber 12. In the second line 17 there is a second check valve 18, which prevents oil from flowing directly out of the second pressure chamber 12, but enables an inflow at any time.
    Furthermore, a control valve 19 is provided which has two switching positions. The control valve 19 is directly connected to a third line 20 of the oil supply channel 14. The control valve 19 acts in one of its two switching positions as a drain valve for the outflow of hydraulic fluid from the second pressure chamber 12 or in its second switching position as a drain valve for the outflow of hydraulic fluid from the first pressure chamber 11. The respective other pressure chamber 11 and 12 is in the respective associated one / 22nd
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Switching position hydraulically locked, which is why the first rod part 2 assumes either the retracted or the extended position. The control valve 19 is switched by means of a control line 21 which is connected to the second line 17 downstream of the second check valve 18 and a return spring 22 which presses the control valve 19 into the first switching position shown in FIG. 1. The second switching position is achieved by generating an increased pressure level in the oil supply channel 14, so that the control valve 13 is pressed into the second switching position against the force of the return spring 22. Corresponding first and second return channels 23.1, 23.2 are connected to the control valve 19 in the associated line sections of the first and second line 15, 17 in order to enable a corresponding outflow from the first pressure chamber 11 and the second pressure chamber 12.
    It should be noted that the hydraulic control circuit 13 can also have additional elements, channels, valves, etc. or less or can be configured in another way in order to provide the desired adjustment function. The hydraulic circuit diagram of the hydraulic control circuit 13 is thus only to be understood as representative of the mode of operation and not of the specific configuration.
    An embodiment of the control valve 19 according to the invention is explained in more detail below with reference to FIGS. 2 and 3.
    Fig. 2 shows a detailed elaborated telescopic connecting rod 1 with the first rod part 2 and the second rod part 4. Since only the essential differences from the previous schematically illustrated connecting rod 1 will be discussed in the following, using the same reference numerals to the above description additionally referred. The section line III represents the section plane as shown in FIG. 3. As a result, the structure of the control valve 19 is mainly shown and described in more detail. The control valve 19 has a first drain valve 24 and a second drain valve 25. Furthermore, a control slide 26 is part of the control valve 19.
    Both drain valves 24 and 25 are constructed identically, which is why the associated elements are only described with reference to the first drain valve 24. The drain valve 24 comprises a screw plug 27 which is screwed into a corresponding, threaded receiving opening in the second rod part 4. A valve spring (helical compression spring) 28 is arranged in the screw plug 27, which acts on the spherical valve body 29. The / 22
    PP32165AT AVL List GmbH, iwis motorsysteme GmbH & Co. KG spherical valve body 29 interacts with a conical valve seat 30 which opens into a valve opening 31. A likewise spherical closing body 32 is arranged in the valve opening 31. The first drain valve 24 is shown in FIG. 3 in the closed position and the second drain valve 25 is shown in the open position. This corresponds to the switching position of the control valve 19 in FIG. 1.
    The drain valves 24 and 25 are actuated by means of the control slide 26. The control slide 26 can be controlled hydraulically and is connected to the engine oil hydraulics. By increasing the pressure from the oil pump, pressure acts on one side on a piston surface 33.1 of the piston 33 of the control slide 26. This moves the control piston 26 to the left against the action of the control piston spring 34 (according to the arrangement in FIG. 3). For this purpose, the control slide 26 has a stop flange 35 which specifies the second position. A closure screw 37 is provided to close off the pressure chamber 36 assigned to the piston 33. The control slide 26 has a first switching cam 38 and a second switching cam 39. Switch cams are to be understood as ramps or elevations which, by moving the control slide 26 in the case of adjacent elements, trigger a movement normal to the movement of the control slide 26. The switching cams 38 and 39 each act on the associated closing body 32, which then moves the valve body 29. In the position of the control slide 26 shown in FIG. 3, there is so much play between the control slide 26 and the closing body 32 that the valve body 29 sits securely on the valve seat 30 and is not impaired by the closing body 32. The closing body 32 assigned to the second drain valve 25 has a raised position in the position of the control slide 26 shown in FIG. 3. The closing body 32 thus acts on the valve body 29 and subsequently compresses the valve spring 28 and thus the valve body 29 away from the valve seat 30. The second drain valve 25 is thereby opened. The oil can flow out of the second pressure chamber 12 while the first pressure chamber 11 is blocked.
    If the control slide 26 now moves to the left, the closing body 32 of the second drain valve 25 slides down on the control cam 39 into another position and releases the valve body 29, so that the valve spring 28 subsequently presses the valve body 29 onto the valve seat 30 and closes the second drain valve 25. The closing body 32 of the first drain valve 24 then slides upward on the control cam 38, as a result of which the associated valve body 29 is also pushed away from the axis of the control slide 26 here. At the same time, the associated valve spring 28 compresses and the valve body 29 lifts / 22
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG from valve seat 30 onwards. As a result, the second valve position of the control valve 19 is then assumed. This results in the short position of the telescopic connecting rod.
    The connecting rod 1 and thus its components are exposed to high acceleration forces during operation. Corresponding centrifugal forces occur solely through the rotary movement about the axis Ak of the crankshaft, which is symbolically shown in FIG. 3. For this reason, it is advantageous if the closing bodies 32 have the lowest possible weight. In the present case, the closing bodies 32 consist of a ceramic material with a density of approximately 2.5 g / mm 3 . Since the closing body 32 is a solid body in the present case, the envelope contour, just like the actual closing body 32, is a sphere. The mass of the closing body is therefore less than the volume specified by the envelope contour of the closing body multiplied by the density of steel. This is assumed to be 7.85 g / mm 3 for the described invention.
    Alternatively, the closing body 32 can also be designed as an extension of the valve body 29, e.g. be formed in one piece with this.
    The alignment of the closing axes Avi and Av2 of the drain valves 24, 25 is also important here. These are aligned parallel to the axis Ak of the crankshaft (and are therefore in the range of ± 45 ° to the axis AK). The influence of the mass of the closing body 32 on the valve spring 28 is thus minimized.
    The forces occurring on the valve body 29 are explained in more detail below with reference to FIG. 4. The configuration of the valve body 29 and the orientation of the valve seat 30 have an important influence on this. The valve seat 30 is formed with an angle α. Due to the cone shape, the tangent between the valve seat 30 and the valve body 29 runs exactly in the surface of the valve seat 30 with an angle α (here 45 °) to the closing axis AV1 and AV2. This angle α is measured to a perpendicular to the closing axis Avi or Av2. In the selected installation position, a force component Fx acts on the valve body 29 due to the crankshaft movement. This has the amount of the product of the mass of the spherical valve body 29 times the maximum acceleration occurring. The maximum acceleration results from the maximum speed of the internal combustion engine. This results in the force component Fy counteracting the closing force of the valve spring 28. This is Fx divided by tangent α. The mass of the closing body 32 actually plays no role in this consideration due to the selected installation position. However, the mass of the closing body 32 has an influence on the actuating force to be made available by means of the / 22
    PP32165AT AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    Control slide 26 and the biasing force of the control slide spring 34. Accelerating forces also act on the closing body 32, which have a similar effect on the control cams 38 and 39 of the control slide 26 and influence the control slide spring 34 and the control pressure to be made available in the pressure chamber 36 , For this reason, the mass should be as small as possible.
    / 22nd
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    List of reference symbols telescopic connecting rod first rod part small connecting rod eye second rod part lower bearing shell large connecting rod eye
    fastener
    adjusting piston
    piston bore
    Cover first pressure chamber, second pressure chamber
    drive circuit
    Oil supply channel first line first check valve second line second check valve
    Third line control valve
    control line
    Return spring
    23.1 first return channel
    23.2 second return channel first drain valve second drain valve
    spool
    Screw
    valve spring
    valve body
    valve seat
    Valve opening / 22
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    closing body
    piston
    piston area
    Spool spring
    stop flange
    pressure chamber
    Screw
    cam
    cam
    crankshaft axis
    Closing axis of the first drain valve
    Closing axis second drain valve / 22
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    权利要求:
    Claims (10)
    [1]
    Expectations
    1. Length-adjustable connecting rod (1) for an internal combustion engine, the connecting rod (1) having at least one switchable drain valve (24, 25) for opening and closing at least one pressure chamber (11, 12), the drain valve (24, 25) having a valve body (29) and a closing body (32) operatively connected to the valve body (29) and a closing mechanism acting on the closing body (32) for direct movement of the closing body (32) and indirect movement of the valve body (29) from a closed to an open position or vice versa, characterized in that the closing body (32) has a mass which is less than the volume predetermined by an envelope contour of the closing body (32) multiplied by the density of steel (7.85 g / mm 3 ).
    [2]
    2. Length-adjustable connecting rod (1) according to claim 1, characterized in that the closing body (32) is made of a ceramic material.
    [3]
    3. Length-adjustable connecting rod (1) according to claim 1 or 2, characterized in that the closing body (32) made of a material with an average density of less than 4.5 g / mm 3 , preferably less than 2.7 g / mm 3 , consists.
    [4]
    4. Length-adjustable connecting rod (1) according to one of the preceding claims, characterized in that the valve body (29) and the closing body (32) are designed as two separate bodies, in particular the valve body (29) and / or the closing body (32) have a spherical shape.
    [5]
    5. Length-adjustable connecting rod (1) according to one of the preceding claims, characterized in that the closing body (32) is connected to a closing section of the valve body (29) on a low-pressure side and there is in engagement with the locking mechanism and / or can be brought into engagement ,
    [6]
    6. Length-adjustable connecting rod (1) according to one of the preceding claims, characterized in that the envelope volume of the valve body (29) is larger than the envelope volume of the closing body (32).
    [7]
    7. Length-adjustable connecting rod (1) according to one of the preceding claims, characterized in that the closing axis (Avi, Av2) of the valve body (29) of the drain valve (24, 25) at an angle of ± 45 ° to the axis (AK) one Connecting rod (1) driving the crankshaft.
    15/22
    PP32165AT
    AVL List GmbH, iwis motorsysteme GmbH & Co. KG
    [8]
    8. Length-adjustable connecting rod (1) according to one of claims 1 to 7, characterized in that the closing axis (Avi, Av2) of the valve body (29) of the drain valve (24, 25) substantially parallel to the axis (AK) of the connecting rod ( 1) driving crankshaft is aligned.
    [9]
    9. Length-adjustable connecting rod (1) according to one of claims 1 to 8, characterized in that the drain valve (24, 25) has a valve spring (28) pressing the valve body (29) against a valve seat (30) and the spring biasing force of the valve spring ( 28) so that the connecting rod (1) is at a standstill such that the calculated force from the maximum acceleration occurring in normal operation on the valve body (29) multiplied by the mass of the valve body (29) and divided by the tangent α is smaller than the spring preload force, whereby α is the angle between the tangent of the valve seat (30) on the valve body (29) and a perpendicular to the closing axis (Avi, Av2).
    [10]
    10. Use of a closing body (32) in a length-adjustable connecting rod (1) according to one of the preceding claims 1 to 9, characterized in that the closing body (32) has a mass which is less than that of an envelope contour of the closing body (32) specified volume multiplied by the density of steel (7.85 g / m 3 ).
    16/22
    PP32165AT
    AVL List GmbH iwis motorsysteme GmbH & Co. KG
    1.4
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    AT519306B1|2019-01-15|Length adjustable connecting rod with a cylinder-piston unit with gap seal, oil reservoir, oil filter and oil scraper
    WO2020223750A1|2020-11-12|Spool valve having two spool valve parts for a longitudinally adjustable connecting rod
    AT16800U1|2020-09-15|Screw connection for length-adjustable connecting rod with different thread pitches
    同族专利:
    公开号 | 公开日
    AT521160B1|2019-11-15|
    DE112019005033A8|2021-07-29|
    CN113167173A|2021-07-23|
    WO2020073067A1|2020-04-16|
    DE112019005033A5|2021-07-08|
    US20210348551A1|2021-11-11|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE102017106939A1|2016-06-16|2017-12-21|ECO Holding 1 GmbH|Connecting rod for a variable compression internal combustion engine and a check valve for a connecting rod for a variable compression internal combustion engine|
    WO2018007534A1|2016-07-06|2018-01-11|Avl List Gmbh|Connecting rod having an adjustable connecting rod length with a mechanical actuating means|
    AT519932A2|2017-05-12|2018-11-15|Avl List Gmbh|Drain valve for high pressures|CN111305956A|2020-02-18|2020-06-19|哈尔滨工程大学|Variable mode engine suitable for various liquid fuels|DE102013113432B4|2013-12-04|2022-02-24|Dr. Ing. H.C. F. Porsche Aktiengesellschaft|Reversing valve unit and internal combustion engine with such a reversing valve unit|
    DE102015109474A1|2015-04-21|2016-10-27|Hilite Germany Gmbh|Changeover valve and connecting rod with a changeover valve|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    AT508662018A|AT521160B1|2018-10-08|2018-10-08|Length adjustable connecting rod with mass-reduced drain valve|AT508662018A| AT521160B1|2018-10-08|2018-10-08|Length adjustable connecting rod with mass-reduced drain valve|
    PCT/AT2019/060334| WO2020073067A1|2018-10-08|2019-10-08|Length-adjustable connecting rod with reduced-mass outlet valve|
    CN201980080851.2A| CN113167173A|2018-10-08|2019-10-08|Length adjustable linkage with reduced mass outlet valve|
    US17/283,235| US20210348551A1|2018-10-08|2019-10-08|Length-adjustable connecting rod with reduced-mass outlet valve|
    DE112019005033.8T| DE112019005033A5|2018-10-08|2019-10-08|Length-adjustable connecting rod with reduced-mass drain valve|
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