Clutch booster with hydraulic damping valve

Abstract

The utility model discloses a clutch booster with a hydraulic damping valve, which comprises a clutch booster assembly, the clutch booster assembly comprises a hydraulic cylinder, and the hydraulic cylinder is connected with the hydraulic damping valve which is used for damping hydraulic pressure sudden change or pressure wave crest in the hydraulic cylinder. The hydraulic cylinder is connected with the hydraulic damping valve, hydraulic oil pressure generated in sudden change or pressure wave crests, especially instantly generated by the sudden change or pressure wave crests, is transmitted to the hydraulic damping valve, sudden change pressure change in the hydraulic cavity is balanced through the hydraulic damping valve, and pressure generated after sudden change or wave crests is reduced and directly transmitted to the clutch. The hydraulic pressure in the hydraulic cylinder is stably output, the influence of sudden pressure change (especially increase) and overlarge pressure wave crest generated in the hydraulic cavity on product control hydraulic stability is avoided, and then the influence of unstable product output pressure is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of clutch boosters, and particularly relates to a clutch booster with a hydraulic shock absorber valve. Background Art

[0002] The clutch is located in the flywheel housing between the engine and the gearbox. The clutch assembly is fixed to the rear plane of the flywheel with screws, and the output shaft of the clutch is the input shaft of the gearbox. During the driving of the vehicle, the driver can step on or release the clutch pedal as needed to temporarily separate and gradually engage the engine and the gearbox, so as to cut off or transmit the power input from the engine to the transmission. The clutch is a commonly used component in mechanical transmission and can separate or engage the transmission system at any time. Among them, the clutch booster is a key component in the automotive clutch system and is mainly used to reduce the force required for the driver to operate the clutch.

[0003] For example, Chinese patent documents 2020209745133, 201020250446, and 201020276410 all disclose a clutch booster. In the structures of these clutch boosters, they all include an air cylinder, a hydraulic cylinder, a piston located in the air cylinder (the two sides of the piston are respectively connected to a push rod and a piston rod, and the piston rod is inserted into the hydraulic cylinder), a return spring located between the piston and the air cylinder wall, and a control valve connected to the hydraulic chamber. Of course, the clutch booster also includes some other auxiliary structures. Although the above clutch boosters can control the clutch with less effort or can solve some problems existing in the clutch booster, in the above hydraulic clutch system, due to the influence of the use environment or unstable factors during use (such as engine vibration, uneven clutch release force, uneven force on the clutch mechanism, poor lubrication, etc.), the pressure of the hydraulic oil in the hydraulic cylinder is unstable, thereby reducing the control stability of the above hydraulic clutch system. Summary of the Utility Model

[0004] To solve the above technical problems, the utility model provides a clutch booster with a hydraulic shock absorber valve, which includes a clutch booster assembly. The clutch booster assembly includes a hydraulic cylinder, and the hydraulic cylinder is connected with a hydraulic shock absorber valve for damping sudden changes or pressure peaks in the hydraulic pressure in the hydraulic cylinder. By connecting the hydraulic shock absorber valve to the hydraulic cylinder, sudden changes or pressure peaks, especially the hydraulic oil pressure generated instantaneously by both, are transmitted to the hydraulic shock absorber valve. The hydraulic shock absorber valve is used to balance the sudden pressure changes in the hydraulic chamber and reduce the direct transmission of the pressure after the sudden change or the pressure peak to the clutch, so that the hydraulic pressure in the hydraulic cylinder is output smoothly, avoiding the influence of excessive sudden pressure changes (especially increases) and pressure peaks generated in the hydraulic chamber on the hydraulic stability control of the product, and further avoiding the influence of unstable output pressure of the product.

[0005] Furthermore, the hydraulic shock absorber valve includes a shock absorber valve housing connected to the hydraulic cylinder. A shock absorption cavity is formed within the shock absorber valve housing. A shock absorption piston is disposed within the shock absorption cavity. The shock absorption piston or a seal disposed on the shock absorption piston is in sliding seal with the inner wall of the shock absorption cavity. The shock absorption cavity is partitioned by the shock absorption piston or the seal into a shock absorption driving cavity communicating with the hydraulic chamber of the hydraulic cylinder and a shock absorption control cavity not communicating with the hydraulic chamber of the hydraulic cylinder. An auxiliary block is connected within the shock absorption control cavity or at the free end of the shock absorption control cavity. An elastic member that compresses under the push of the shock absorption piston and resets without the action of oil pressure is disposed between the shock absorption piston and the auxiliary block. A shock absorption piston and an elastic member cooperating therewith are disposed within the hydraulic shock absorber valve. The hydraulic oil pressure after mutation or at the wave crest is transmitted to the shock absorption piston, thereby compressing the elastic member. The sudden pressure of the hydraulic oil is buffered by the compression of the elastic member, so that the hydraulic pressure in the hydraulic cylinder is stably output.

[0006] In one embodiment, the elastic member is at least one shock absorption spring. The two ends of the shock absorption spring respectively abut against the shock absorption piston and the auxiliary block. By adopting a common spring design, the design cost is reduced, and it can be selected according to the elastic coefficient.

[0007] In one embodiment, the elastic member is at least one shock absorption group composed of shock absorption sheets. By replacing the shock absorption spring with a shock absorption group composed of shock absorption sheets, problems such as hydraulic instability and excessive hydraulic volume consumption caused by too large a movement stroke of the shock absorption spring can be avoided, which is beneficial to the control of the volume of the hydraulic oil supply end and improves the system stroke efficiency. For another example, the shock absorption group is composed of multiple groups of shock absorption sheets and can be used in a stacked manner. If multiple springs are arranged in combination, connecting parts or connection structures need to be added, resulting in a complex structure and affecting the performance stability.

[0008] In one embodiment, the elastic member is composed of at least one shock absorption spring and at least one shock absorption group composed of shock absorption sheets. By combining the shock absorption spring and the shock absorption group, the advantages of both can be utilized in combination, the number of connecting parts is reduced, and the performance stability of the system is improved.

[0009] Further, the elastic member includes one shock-absorbing spring, a first shock-absorbing group and a second shock-absorbing group composed of shock-absorbing sheets. The shock-absorbing sheet is an annular structure having at least a bent portion. At the end of the shock-absorbing piston close to the auxiliary block, a first columnar protrusion or a first groove is formed. At the end of the auxiliary block close to the shock-absorbing piston, a second columnar protrusion or a second groove is formed. The first shock-absorbing group is sleeved on the first columnar protrusion or placed in the first groove. One end of the shock-absorbing spring is sleeved on the second columnar protrusion or placed in the second groove. The shock-absorbing spring abuts against the bent portion of the first shock-absorbing group. The second shock-absorbing group is sleeved on the end of the auxiliary block close to the shock-absorbing piston, and at the end of the shock-absorbing piston close to the auxiliary block, a driving end for compressing the second shock-absorbing group under the action of oil pressure is formed.

[0010] Furthermore, the elastic coefficient of the shock-absorbing spring is greater than that of the second shock-absorbing group, and the elastic coefficient of the second shock-absorbing group is greater than that of the first shock-absorbing group.

[0011] By providing one shock-absorbing spring and two shock-absorbing groups composed of shock-absorbing sheets, and further setting the elastic coefficients among the three, during use, when the oil pressure reaches the design parameter, the space between the compression sheets of the first compression group and the compression sheets of the second compression group is preferentially compressed, and the shock-absorbing spring remains stationary. Then, the first compression group basically no longer deforms. As the oil pressure continues to increase, the compression sheets of the second compression group are continuously compressed, and the shock-absorbing spring remains stationary or is slightly compressed. Finally, as the oil pressure continues to increase, the second compression group basically no longer deforms, and the shock-absorbing spring is continuously compressed. The above use process means that the oil pressure can reach the level capable of compressing the spring. Of course, in the actual use process, the oil pressure does not necessarily reach the above level. The change process of the above elastic member is related to the pressure of the oil pressure and can be a part of the above process. At the same time, the specific compression change process of the elastic member is related to the selected elastic coefficient. For example, in a part of the above process, the two elastic members may be compressed together. Of course, the elastic member with a smaller elastic coefficient is quickly compressed to the limit. Through the above specific setting of the elastic member, the short-range compression space of the shock-absorbing group composed of elastic sheets can be effectively utilized, the stability of the oil pressure during hydraulic mutation is improved, and at the same time, the consumption of the hydraulic volume is not too large, the control of the volume of the liquid supply end is improved, and the system stroke efficiency is ensured. At the same time, the application of the double shock-absorbing group can provide a variety of application combinations to adapt to a variety of scenarios. Finally, by providing the shock-absorbing spring with the largest elastic coefficient, it plays a role of final backup. If the pressure becomes extremely large, it can avoid the shock-absorbing group from being unable to play a shock-absorbing role due to the short stroke. Through the combination of a large elastic coefficient and a stroke greater than that of the shock-absorbing group, the oil pressure stability is ensured as much as possible, and the system stroke and working efficiency are ensured.

[0012] In one embodiment, a sealing ring is provided between the auxiliary block and the shock absorbing control chamber; a breathing channel penetrating the auxiliary block is formed in the auxiliary block, and a filter element structure is provided at the end of the breathing channel close to the atmosphere. By providing the breathing channel and the filter element structure, the sensitivity of the shock absorbing valve can be improved.

[0013] In one embodiment, the end of the breathing channel close to the filter element structure expands outward to form an annular groove. By forming the annular groove, when inhaling, the annular groove is used to block the tiny moisture brought in, thereby reducing the moisture entering the shock absorber valve; when exhaling, the tiny moisture in the annular groove can be discharged by backblowing. At the same time, dust is adsorbed on the surface of the filter element during inhalation and is removed by backblowing during exhalation.

[0014] In one embodiment, the shock absorbing valve housing is integrally formed with the hydraulic cylinder. The integrally formed design can reduce oil circuit connections, reduce the possibility of leakage, and avoid shock absorption failure as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the following is a brief introduction to the drawings required for use in the specific implementation modes. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 It is a schematic diagram of the structure of the clutch booster with a hydraulic damping valve of the utility model;

[0017] Figure 2 yes Figure 1 Enlarged view of the hydraulic shock absorber valve (Part A);

[0018] Figure 3 It is a structural schematic diagram of another shock-absorbing sheet of the utility model;

[0019] Figure 4 It is an arrangement diagram of another shock absorbing group of the utility model;

[0020] The reference numerals in the figure are represented as follows: 1-hydraulic cylinder; 2-shock-absorbing valve housing; 3-shock-absorbing piston; 4-shock-absorbing drive chamber; 5-shock-absorbing control chamber; 6-auxiliary block; 7-shock-absorbing spring; 8-first shock-absorbing group; 9-second shock-absorbing group; 10-bending portion; 11-first columnar protrusion; 12-second groove; 13-sealing ring; 14-breathing channel; 15-filter element structure; 16-annular groove; 17-shock-absorbing channel; 18-shock-absorbing plate. DETAILED DESCRIPTION

[0021] The following clearly and completely describes the content of the present utility model in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all embodiments. Based on the embodiments in the present utility model, other embodiments obtained by those of ordinary skill in the art without creative efforts all fall within the scope of protection of the present utility model.

[0022] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0023] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0024] In addition, the technical features involved in different embodiments of the present utility model described below can be combined with each other as long as they do not conflict with each other. Embodiment 1

[0025] This embodiment discloses a clutch booster with a hydraulic shock absorber valve, which includes a clutch booster assembly. The clutch booster assembly includes a hydraulic cylinder 1. Of course, it also includes other structures, such as an air cylinder, a hydraulic cylinder, a piston located in the air cylinder (the two sides of the piston are respectively connected to a push rod and a piston rod, and the piston rod is inserted into the hydraulic cylinder), a return spring located between the piston and the air cylinder wall, and a control valve connected to the hydraulic chamber. These are not the key points of the invention, and an existing clutch booster can be used. Except for the patents in the background technology, the clutch booster assembly in other documents can also be used. The hydraulic cylinder 1 is connected with a hydraulic shock absorber valve for damping sudden changes or pressure peak segments in the hydraulic pressure in the hydraulic cylinder 1.

[0026] As Figure 1 and Figure 2 shown, the hydraulic shock absorber valve includes a shock absorber valve housing 2 connected to the hydraulic cylinder 1. The shock absorber valve housing 2 can exist independently or be integrally formed with the cylinder wall of the hydraulic cylinder 1, as Figure 1 and Figure 2As shown; in this embodiment, it is preferably integrally formed; a shock-absorbing cavity is formed in the shock-absorbing valve housing 2, and a shock-absorbing piston 3 is arranged in the shock-absorbing cavity. The shock-absorbing piston 3 or the seal arranged on the shock-absorbing piston 3 is in sliding seal with the inner wall of the shock-absorbing cavity. In this embodiment, it is preferably the seal arranged on the shock-absorbing piston 3 that is in sliding seal with the inner wall of the shock-absorbing cavity. The seal is preferably an O-ring or a piston ring, such as a lip seal; the shock-absorbing cavity is separated by the shock-absorbing piston or the seal into a shock-absorbing driving cavity 4 communicating with the hydraulic cavity of the hydraulic cylinder 1 and a shock-absorbing control cavity 5 not communicating with the hydraulic cavity of the hydraulic cylinder 1; an auxiliary block 6 is connected in the shock-absorbing control cavity 5 or at the free end of the shock-absorbing control cavity 5. Preferably, the auxiliary block 6 is connected at the free end of the shock-absorbing control cavity 5. As for the connection method between the two, there are various ways. In this embodiment, it is preferably connected by a threaded structure, that is, the auxiliary block 6 is provided with an external thread, and the shock-absorbing control cavity 5 is provided with an internal thread. During use, the auxiliary block 6 is screwed into the shock-absorbing control cavity 5; an elastic member is arranged between the shock-absorbing piston 3 and the auxiliary block 6, which is compressed under the push of the shock-absorbing piston 3 and reset when there is no oil pressure acting on the shock-absorbing piston 3. The setting of the elastic member is various.

[0027] In one embodiment, the elastic member is at least 1 shock-absorbing spring, and both ends of 1 shock-absorbing spring or a combination of multiple shock-absorbing springs are respectively abutted against the shock-absorbing piston 3 and the auxiliary block 6.

[0028] In one embodiment, the elastic member is at least 1 group of shock-absorbing groups composed of shock-absorbing sheets. As for the positional relationship between the shock-absorbing group and the shock-absorbing piston 3 and the auxiliary block 6, it needs to be determined according to the number of groups and the specific structure.

[0029] In one embodiment, the elastic member is composed of a shock-absorbing spring and a shock-absorbing group composed of shock-absorbing sheets. As for the number of shock-absorbing springs and the number of shock-absorbing groups, there are various ways, which are determined according to the specific design and specific structure. In this embodiment, the elastic member includes 1 shock-absorbing spring 7 and a first shock-absorbing group 8 and a second shock-absorbing group 9 composed of shock-absorbing sheets 18. Specifically, the shock-absorbing sheet 18 is at least an annular structure with a bent portion 10. Of course, the structure of the bent portion 10 is various. Preferably, the bent portion 10 is an annular bend, as Figure 2 shown; in addition to the bent portion 10, the shock-absorbing sheet 18 may also include other parts, such as Figure 4As shown; a first columnar protrusion or a first groove is formed at the end of the shock-absorbing piston 3 close to the auxiliary block 6, and a second columnar protrusion or a second groove is formed at the end of the auxiliary block 6 close to the shock-absorbing piston 3; the first shock-absorbing group 8 is sleeved on the first columnar protrusion or placed in the first groove, one end of the shock-absorbing spring 7 is sleeved on the second columnar protrusion or placed in the second groove, and the shock-absorbing spring 7 abuts against the bent portion of the first shock-absorbing group 8. In this embodiment, as Figure 2 shown, a first columnar protrusion 11 is formed at the end of the shock-absorbing piston 3 close to the auxiliary block 6, and a second groove 12 is formed at the end of the auxiliary block 6 close to the shock-absorbing piston 3; the first shock-absorbing group 8 is sleeved on the first columnar protrusion 11, and one end of the shock-absorbing spring 7 is placed in the second groove 12. The second shock-absorbing group 9 is sleeved on the end of the auxiliary block 6 close to the shock-absorbing piston 3, and a structure for supporting one end of the second shock-absorbing group 9, such as a stepped structure, is formed on the auxiliary block 6, and a driving end for compressing the second shock-absorbing group 9 under the action of oil pressure is formed at the end of the shock-absorbing piston 3 close to the auxiliary block 6. The structure of the driving end is various. Preferably, it is an annular structure. As for the combination form of the shock-absorbing sheets of the first shock-absorbing group 8 and the second shock-absorbing group 9, it is various. As Figure 2 shown, two adjacent shock-absorbing sheets are combined back to back or in reverse, and as Figure 3 shown in the combination of the first shock-absorbing group 8 in

[0030] In one embodiment, the elastic coefficient of the shock-absorbing spring 7 is greater than that of the second shock-absorbing group 9, and the elastic coefficient of the second shock-absorbing group 9 is greater than that of the first shock-absorbing group 8.

[0031] In one embodiment, a sealing ring 13 is provided between the auxiliary block 6 and the shock-absorbing control cavity 5; a breathing channel 14 penetrating the auxiliary block 6 is formed in the auxiliary block 6, and a filter element structure 15 is provided at the end of the breathing channel 14 close to the atmosphere.

[0032] In one embodiment, the end of the breathing channel 14 close to the filter element structure 15 expands to form an annular groove 16. The structure of the annular groove 16 is various. As Figure 2 shown, the cross-section of the annular groove 16 is two triangles up and down. At this time, a frustum structure is formed on the side wall of the port of the breathing channel 14 at this place.

[0033] The usage process of the present utility model is as follows: When the pressure in the hydraulic cylinder 1 increases too fast due to sudden changes or peak segments, the hydraulic oil pushes the shock-absorbing piston 3 to slide towards the position of the auxiliary block 6, and thus compresses the shock-absorbing group and the shock-absorbing spring during the sliding process; when the pressure in the hydraulic cylinder 1 decreases, the shock-absorbing piston 3 slides in the reverse direction, and the shock-absorbing group and the shock-absorbing spring return to their original positions.

[0034] Obviously, the above-mentioned embodiments are merely examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or alterations can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. And the obvious changes or alterations derived therefrom still fall within the protection scope of the present utility model.

Claims

1. A clutch booster with a hydraulic damping valve, characterized in that: The invention comprises a clutch booster assembly, wherein the clutch booster assembly comprises a hydraulic cylinder, and the hydraulic cylinder is connected with a hydraulic damping valve for damping sudden changes or pressure peaks of the hydraulic pressure in the hydraulic cylinder.

2. The clutch booster with a hydraulic damping valve according to claim 1, characterized in that: The hydraulic shock absorber valve includes a shock absorber valve housing connected to the hydraulic cylinder, a shock absorber cavity is formed in the shock absorber valve housing, a shock absorber piston is arranged in the shock absorber cavity, the shock absorber piston or a seal arranged on the shock absorber piston is slidingly sealed with the inner wall of the shock absorber cavity; the shock absorber cavity is separated by the shock absorber piston or the seal into a shock absorber drive cavity and a shock absorber control cavity connected to the hydraulic cavity of the hydraulic cylinder; an auxiliary block is connected to the shock absorber control cavity or the free end of the shock absorber control cavity; an elastic member is arranged between the shock absorber piston and the auxiliary block, which is compressed under the push of the shock absorber piston and reset without the action of oil pressure.

3. The clutch booster with a hydraulic damping valve according to claim 2, characterized in that: The elastic member is at least one shock absorbing spring, and two ends of the shock absorbing spring are respectively in contact with the shock absorbing piston and the auxiliary block.

4. The clutch booster with a hydraulic damping valve according to claim 2, characterized in that: The elastic member is at least one shock-absorbing group consisting of shock-absorbing sheets.

5. The clutch booster with a hydraulic damping valve according to claim 2, characterized in that: The elastic member is composed of at least one shock absorbing spring and at least one shock absorbing group composed of shock absorbing sheets.

6. The clutch booster with a hydraulic damping valve according to claim 5, characterized in that: The elastic member comprises a shock absorbing spring and a first shock absorbing group and a second shock absorbing group consisting of shock absorbing sheets.

7. The clutch booster with a hydraulic damping valve according to claim 6, characterized in that: The shock-absorbing plate is an annular structure with at least a bent portion, and a first columnar protrusion or a first groove is formed at the end of the shock-absorbing piston close to the auxiliary block, and a second columnar protrusion or a second groove is formed at the end of the auxiliary block close to the shock-absorbing piston; the first shock-absorbing group is sleeved on the first columnar protrusion or placed in the first groove, one end of the shock-absorbing spring is sleeved on the second columnar protrusion or placed in the second groove, and the shock-absorbing spring abuts against the bent portion of the first shock-absorbing group; the second shock-absorbing group is sleeved on the end of the auxiliary block close to the shock-absorbing piston, and the end of the shock-absorbing piston close to the auxiliary block forms a driving end that compresses the second shock-absorbing group under the action of oil pressure.

8. The clutch booster with a hydraulic damping valve according to claim 7, characterized in that: The elastic coefficient of the shock absorbing spring is greater than the elastic coefficient of the second shock absorbing group, and the elastic coefficient of the second shock absorbing group is greater than the elastic coefficient of the first shock absorbing group.

9. The clutch booster with a hydraulic damping valve according to any one of claims 2 to 8, characterized in that: A sealing ring is arranged between the auxiliary block and the shock absorption control chamber; a breathing channel penetrating the auxiliary block is formed in the auxiliary block, and a filter element structure is arranged at the end of the breathing channel close to the atmosphere.

10. The clutch booster with a hydraulic damping valve according to claim 9, characterized in that: The end of the breathing channel close to the filter element structure expands outward to form an annular groove.

11. The clutch booster with a hydraulic damping valve according to claim 2, characterized in that: The shock absorbing valve housing and the hydraulic cylinder are integrally formed.

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