CN111810554A

CN111810554A - Piston device for clutch

Info

Publication number: CN111810554A
Application number: CN202010589947.6A
Authority: CN
Inventors: 万全喜; 孙康笑; 范述鑫; 马长智
Original assignee: Shengrui Transmission Co Ltd
Current assignee: Shengrui Transmission Co Ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-10-23

Abstract

The disclosure relates to the technical field of automatic transmissions and provides a piston device for a clutch. The piston device comprises a piston support, a main piston, a balance piston and a reset piece, wherein the piston support is arranged on a support piece of the transmission, and one side of the piston support is provided with an annular mounting groove; the main piston is arranged in the annular mounting groove, and a main piston cavity is formed between the inner wall of the annular mounting groove and the main piston; the balance piston is arranged in the annular mounting groove, the inner ring of the balance piston is sleeved on the periphery of the main piston, the outer ring of the balance piston is supported on the inner wall of the annular mounting groove, and a balance piston cavity is formed between the balance piston and the main piston; the reset piece is used for applying force to the main piston in the direction away from the friction plate group. The outer ring of the main piston and the outer ring of the balance piston are both supported on the inner wall of the annular mounting groove, so that the outer diameters of the main piston and the balance piston are the same, the centrifugal force of the main piston and the centrifugal force of the balance piston are the same, and vibration in the working process is reduced.

Description

Piston device for clutch

Technical Field

The present disclosure relates to the technical field of automatic transmissions, and more particularly, to a piston device for a clutch.

Background

An automotive transmission is a set of transmission devices for coordinating the rotational speed of an engine and the actual driving speed of wheels, and is used for exerting the best performance of the engine. The transmission can generate different gear ratios between an engine and wheels during the running process of the automobile, and the transmission of rotating speeds of different gears is realized.

The manual transmission mainly comprises gears and a rotating shaft, and the speed change and torque change are generated by different gear combinations; the automatic transmission AT consists of a hydraulic torque converter, a planetary gear and a hydraulic control system, and achieves speed and torque changing through a hydraulic transmission and gear combination mode.

Among them, the automatic transmission has advantages of comfortable driving, reducing fatigue of driver, etc., and has become a development direction of modern car configuration. The automatic transmission utilizes a planetary gear mechanism to change speed, can automatically change speed according to the degree of an accelerator pedal and the change of vehicle speed, and a driver only needs to operate the accelerator pedal to control the vehicle speed, so that the driver can watch road traffic with full attention without being shifted to be in a mess.

The automatic transmission includes a plurality of planetary gear assemblies and a plurality of shift elements, wherein the shift elements include clutches and brakes. The transmission relationship of each planetary transmission assembly is changed through the gear shifting unit, so that the automatic transmission outputs different rotating speeds. The clutch includes a piston assembly including a master piston, a balance piston, and a piston support, and a friction plate assembly. Wherein, form main piston chamber between piston support and the main piston, form balanced piston chamber between main piston and the balanced piston, through letting in hydraulic oil towards main piston intracavity, and then promote main piston and press to the friction disc subassembly, and then make the clutch closed, this in-process, the effect of balanced pressure is played in the balanced piston intracavity letting in hydraulic oil. In the prior art, the balance piston is usually arranged on the inner side of the main piston, the outer diameter of the main piston is different from that of the balance piston due to the design mode, dynamic balance cannot be guaranteed, and vibration is large.

Disclosure of Invention

To solve the above technical problem or at least partially solve the above technical problem, the present disclosure provides a piston device for a clutch.

The present disclosure provides a piston device for a clutch, comprising:

the piston support is arranged on a support piece of the transmission, and an annular mounting groove is formed in one side, facing the friction plate set of the clutch, of the piston support;

the main piston is arranged in the annular mounting groove, a main piston cavity is formed between one side of the main piston and the inner wall of the annular mounting groove, the other side of the main piston is supported on the side surface of a friction plate set of the clutch, the main piston is in sliding fit with the piston support, and the piston support is provided with a first oil hole through which hydraulic oil can flow into the main piston cavity;

the balance piston is arranged in the annular mounting groove, the inner ring of the balance piston is sleeved on the periphery of the main piston and is in sliding fit with the main piston, the outer ring of the balance piston is supported on the inner wall of the annular mounting groove, the balance piston is arranged on one side, facing the friction plate group, of the main piston and forms a balance piston cavity with the main piston, a second oil hole through which hydraulic oil can enter the balance piston cavity is formed in the main piston, and a third oil hole communicated with the second oil hole is formed in the piston support;

and the resetting piece is arranged in the balance piston cavity and used for applying force far away from the direction of the friction plate group to the main piston.

Optionally, the piston support includes inner skleeve, outer sleeve and connection pad, the inner skleeve cover is established support piece's periphery, the connection pad is connected the inner skleeve with the outer sleeve is kept away from one side of friction disc group, makes connection pad, inner skleeve and the outer sleeve encloses into the annular mounting groove, first oilhole and third oilhole all set up on the inner skleeve.

Optionally, the main piston includes the main piston inner tube and sets up the main piston inner tube is kept away from the main piston pushing tray of friction disc group one side, main piston inner tube cover is established the periphery of inner skleeve, and with the inner skleeve is along its axial direction sliding fit, the outer lane of main piston pushing tray supports on the inner wall of outer skleeve.

Optionally, the number of the second oil holes is multiple, each of the second oil holes is disposed on the main piston inner cylinder along a circumferential direction of the main piston inner cylinder, two first sealing members are disposed between the main piston inner cylinder and the inner sleeve, and the two first sealing members are disposed on two sides of the second oil hole respectively.

Optionally, an annular oil groove is formed in the periphery of the inner sleeve, the annular oil groove is communicated with the third oil hole, one end of each second oil hole is communicated with the annular oil groove, and the other end of each second oil hole is communicated with the balance piston cavity.

Optionally, the inner ring of the balance piston is supported on the periphery of the main piston inner cylinder and is in sliding fit with the main piston inner cylinder, and the outer ring of the balance piston is supported on the inner wall of the outer sleeve and is in limit fit with the outer sleeve.

Optionally, a clamp spring for limiting the balance piston is arranged on the inner wall of the outer sleeve, and the clamp spring is supported on one side, facing the friction plate group, of the balance piston.

Optionally, the balance piston is far away from one side of friction plate group is equipped with first installation cavity, be equipped with first supporting seat in the first installation cavity, main piston pushes away the dish orientation one side of friction plate group is equipped with the second installation cavity, be equipped with the second supporting seat in the second installation cavity, first supporting seat with the second supporting seat sets up relatively, it includes reset spring to reset, reset spring's both ends overlap respectively and establish on first supporting seat and the second supporting seat.

Optionally, the first oil hole is inclined towards a direction away from the friction plate group, the main piston push disc is connected with the main piston inner cylinder in an arc manner, and an oil outlet end of the first oil hole is opposite to a connection position of the main piston push disc and the main piston inner cylinder.

Compared with the prior art, the technical scheme provided by the embodiment of the disclosure has the following advantages:

the outer ring of the main piston and the outer ring of the balance piston are both supported on the inner wall of the annular mounting groove, so that the outer diameters of the main piston and the balance piston are the same, the centrifugal force of the main piston and the centrifugal force of the balance piston are the same, and vibration in the working process is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.

In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.

FIG. 1 is a cross-sectional view of a clutch arrangement according to an embodiment of the present disclosure;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a cross-sectional view of an arrangement of a piston device according to an embodiment of the disclosure.

Wherein, 1, a piston support; 11. an inner sleeve; 12. an outer sleeve; 13. a connecting disc; 2. a support member; 21. a friction plate set; 22. sealing the steel sleeve; 23. an oil inlet hole; 24. an oil supply passage; 3. a primary piston; 31. a primary piston chamber; 32. a main piston inner cylinder; 33. a main piston push plate; 4. a first oil hole; 41. a second oil hole; 42. a third oil hole; 43. an annular oil groove; 5. a balance piston; 51. a balance piston cavity; 6. a first seal member; 61. a second seal member; 62. a third seal member; 7. a clamp spring; 8. a first support base; 81. a second support seat; 9. a return spring.

Detailed Description

In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.

As shown in fig. 1, the piston device for a clutch provided in the embodiment of the present application includes a piston support 1, a main piston 3, a balance piston 5, and a restoring member.

As shown in fig. 1 and 2, the piston support 1 is disposed on a support 2 of the transmission, and the side of the piston support 1 facing the friction plate set 21 of the clutch is provided with an annular mounting groove. Wherein the support 2 generally refers to a component for mounting the piston support 1, the specific structure of which is selected according to specific design requirements. In some transmissions, as shown in fig. 3, the support member 2 is a brake outer hub, i.e. the piston support 1 is mounted on the outer periphery of the brake outer hub, wherein, in order to avoid leakage of hydraulic oil, a sealing steel sleeve 22 may be provided between the piston support 1 and the brake outer hub, and an oil inlet hole 23 communicating with the third oil hole 42 is provided on the sealing steel sleeve 22, and an oil supply passage 24 for supplying oil toward the oil inlet hole 23 is provided on the brake outer hub.

The main piston 3 is disposed inside the annular mounting groove, which does not mean that the entire structure of the main piston 3 is disposed inside the annular mounting groove, i.e., the main piston 3 may partially protrude out of the annular mounting groove. A main piston cavity 31 is formed between one side of the main piston 3 and the inner wall of the annular mounting groove, the other side of the main piston 3 is supported on the side surface of the friction plate group 21 of the clutch, and the main piston 3 is in sliding fit with the piston support 1, wherein the sliding fit means that the main piston 3 moves relative to the piston support 1 along the axial direction of the piston support. The piston support 1 is provided with a first oil port 4 through which hydraulic oil can flow into the main piston chamber 31. After entering the main piston cavity 31 through the first oil hole 4, the hydraulic oil pushes the main piston 3 to move towards the friction plate group 21, and then the friction plate group 21 is closed.

The balance piston 5 is disposed inside the annular mounting groove, which does not mean that the entire structure of the balance piston 5 is disposed inside the annular mounting groove, i.e., the balance piston 5 may partially protrude out of the annular mounting groove. The inner ring of the balance piston 5 is sleeved on the periphery of the main piston 3 and is in sliding fit with the main piston 3, and the outer ring of the balance piston 5 is supported on the inner wall of the annular mounting groove, so that the main piston 3 moves relative to the balance piston 5 along the axial direction of the main piston. The balance piston 5 is arranged on one side of the main piston 3 facing the friction plate group 21, a balance piston cavity 51 is formed between the balance piston 5 and the main piston 3, a second oil hole 41 allowing hydraulic oil to enter the balance piston cavity 51 is formed in the main piston 3, and a third oil hole 42 communicated with the second oil hole 41 is formed in the piston support 1. The hydraulic oil enters the second oil hole 41 through the third oil hole 42 and then enters the balance piston chamber 51 to balance the oil pressure of the main piston 3.

A reset member is disposed within balance piston chamber 51 for applying a force to master piston 3 in a direction away from set of friction plates 21. When the oil pressure in the main piston 3 is removed, the reset member pushes the main piston 3 to move in a direction away from the friction plate group 21, so that the friction plate group 21 is opened.

The working principle of the disclosure is as follows:

when the clutch needs to be closed, oil is supplied to an oil path of the transmission, hydraulic oil enters the main piston cavity 31 through the first oil hole 4, and after the main piston cavity 31 is filled with the hydraulic oil, the main piston 3 is pushed to move towards the direction of the friction plate set 21, so that the friction plate set 21 is pressed through the side end of the main piston 3, and the clutch is closed. And in this process, the other oil passage of the transmission is supplied with oil, the hydraulic oil of this oil passage enters the balance piston chamber 51 through the third oil hole 42 and the second oil hole 41 in order, and the hydraulic oil plays a role of balancing the pressure of the master piston 3 in the balance piston chamber 51.

When the clutch needs to be opened, the oil supply of the transmission oil path is stopped, the main piston 3 moves towards the direction far away from the friction plate set 21 under the action of the reset piece, so that the side end of the main piston 3 gradually loosens the friction plate set 21, and the clutch is opened.

The outer rings of the main piston 3 and the balance piston 5 are supported on the inner wall of the annular mounting groove, so that the outer diameters of the main piston 3 and the balance piston 5 are the same, the centrifugal force of the main piston 3 and the centrifugal force of the balance piston 5 are the same, and vibration in the working process is reduced.

As shown in fig. 2, the piston support 1 comprises an inner sleeve 11, an outer sleeve 12 and a connecting plate 13, wherein the inner sleeve 11 is sleeved on the periphery of the support 2, or the inner sleeve 11 is sleeved on the periphery of the sealing cylinder sleeve. The connecting disc 13 is connected to the inner sleeve 11 and the outer sleeve 12 on the side away from the friction plate group 21, so that the connecting disc 13, the inner sleeve 11 and the outer sleeve 12 enclose an annular mounting groove, and the first oil hole 4 and the third oil hole 42 are all arranged on the inner sleeve 11.

The main piston 3 comprises a main piston inner cylinder 32 and a main piston push disc 33 arranged on one side of the main piston inner cylinder 32 far away from the friction plate group 21, the main piston inner cylinder 32 is sleeved on the periphery of the inner sleeve 11 and is in sliding fit with the inner sleeve 11 along the axial direction of the inner sleeve, the outer ring of the main piston push disc 33 is supported on the inner wall of the outer sleeve 12, and a main piston cavity 31 is formed between the main piston push disc 33 and the inner wall of the piston support 1. And a second sealing element 61 is arranged between the outer ring of the main piston pushing disc 33 and the inner wall of the outer sleeve 12, so that the hydraulic oil in the main piston cavity 31 is prevented from leaking. Preferably, the second seal 61 is a sealing ring.

Further optimally, the first oil hole 4 is inclined towards the direction away from the friction plate group 21, the main piston thrust disc 33 is connected with the main piston inner cylinder 32 in an arc manner, and the oil outlet end of the first oil hole 4 is opposite to the connection part of the main piston thrust disc 33 and the main piston inner cylinder 32.

This kind of design is applicable to the starting clutch, because the starting clutch is far away from the input shaft of derailleur distance, can't directly supply oil through input shaft oil circuit, consequently, need set up the oilhole on support piece 2, and hydraulic oil flows to first oilhole 4 through the oilhole on support piece 2. Therefore, the present disclosure provides both the first oil hole 4 and the third oil hole 42 in the inner sleeve 11, and at the same time, to avoid leakage of the hydraulic oil, sealing means are provided on both sides of the first oil hole 4 and the third oil hole 42. Therefore, the oil inlet end of the first oil hole 4 cannot be arranged at the position, close to the connecting disc 13, of the inner sleeve 11, and then the first oil hole 4 is arranged in an oblique mode, meanwhile, the piston push disc is connected with the inner cylinder 32 of the main piston in an arc mode, a space is provided for hydraulic oil to enter the main piston cavity 31, the size of the main piston cavity 31 is effectively reduced through the design mode, the main piston cavity 31 is filled with the hydraulic oil quickly, and the response speed of the clutch is increased.

As shown in fig. 2, the second oil holes 41 are plural, each of the second oil holes 41 is provided in the main piston inner cylinder 32 along the circumferential direction of the main piston inner cylinder 32, two first seals 6 are provided between the main piston inner cylinder 32 and the inner sleeve 11, and the two first seals 6 are provided on both sides of the second oil hole 41, respectively. The first seal 6 is preferably a sealing ring. Further preferably, the outer periphery of the inner sleeve 11 is provided with an annular oil groove 43, the annular oil groove 43 communicates with the third oil holes 42, one end of each of the second oil holes 41 communicates with the annular oil groove 43, and the other end communicates with the balance piston chamber 51. The hydraulic oil flows into the annular oil groove 43 through the third oil hole 42 and accumulates in the annular oil groove 43, and when the amount of the hydraulic oil in the annular oil groove 43 reaches a certain level, the hydraulic oil flows toward the balance piston chamber 51 through the second oil hole 41. This design increases the rate at which hydraulic oil enters the balance piston chamber 51, ensuring a balancing effect of the main piston 3.

The inner ring of the balance piston 5 is supported on the periphery of the main piston inner cylinder 32 and is in sliding fit with the main piston inner cylinder 32, and meanwhile, the main piston inner cylinder 32 extends out of the balance piston 5 towards one side of the friction plate group 21, so that the main piston 3 can conveniently compress the friction plate group 21. The outer ring of the balance piston 5 is supported on the inner wall of the outer sleeve 12 and is in a limit fit with the outer sleeve 12. Preferably, a third seal 62 is provided between the outer ring of the balance piston 5 and the inner wall of the outer sleeve 12 to prevent the hydraulic oil in the balance piston chamber 51 from flowing out. Preferably, the third seal 62 is a gasket.

The inner wall of the outer sleeve 12 is provided with a clamp spring 7 for limiting the balance piston 5, and the clamp spring 7 is supported on one side of the balance piston 5 facing the friction plate group 21. Support is provided for balanced piston 5 through setting up jump ring 7, avoids balanced piston 5 to remove towards the direction of friction disc group 21, and then makes the hydraulic oil in the balanced piston chamber 51 can play the effect of balanced oil pressure for main piston 3.

As shown in fig. 2, a first mounting cavity is arranged on one side of the balance piston 5 away from the friction plate group 21, a first supporting seat 8 is arranged in the first mounting cavity, a second mounting cavity is arranged on one side of the main piston push disc 33 facing the friction plate group 21, a second supporting seat 81 is arranged in the second mounting cavity, the first supporting seat 8 and the second supporting seat 81 are arranged oppositely, the reset piece includes a reset spring 9, and two ends of the reset spring 9 are respectively sleeved on the first supporting seat 8 and the second supporting seat 81. First supporting seat 8 and second supporting seat 81 adopt columnar structure, and first supporting seat 8 and second supporting seat 81 all set up along balance piston 5's axial direction, play the guide effect for reset spring 9's flexible.

It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A piston arrangement for a clutch, comprising:

the piston support (1) is arranged on a support piece (2) of the transmission, and one side, facing a friction plate set (21) of the clutch, of the piston support (1) is provided with an annular mounting groove;

the main piston (3) is arranged inside the annular mounting groove, a main piston cavity (31) is formed between one side of the main piston (3) and the inner wall of the annular mounting groove, the other side of the main piston is supported on the side surface of a friction plate set (21) of the clutch, the main piston (3) is in sliding fit with the piston support (1), and a first oil hole (4) through which hydraulic oil can flow into the main piston cavity (31) is formed in the piston support (1);

the balance piston (5) is arranged in the annular mounting groove, the inner ring of the balance piston (5) is sleeved on the periphery of the main piston (3) and is in sliding fit with the main piston (3), the outer ring of the balance piston (5) is supported on the inner wall of the annular mounting groove, the balance piston (5) is arranged on one side, facing the friction plate group (21), of the main piston (3) and forms a balance piston cavity (51) with the main piston (3), a second oil hole (41) allowing hydraulic oil to enter the balance piston cavity (51) is formed in the main piston (3), and a third oil hole (42) communicated with the second oil hole (41) is formed in the piston support (1);

the resetting piece is arranged in the balance piston cavity (51) and is used for applying force to the main piston (3) in the direction away from the friction plate group (21).

2. The piston device for a clutch according to claim 1, wherein the piston support (1) includes an inner sleeve (11), an outer sleeve (12) and a connecting disc (13), the inner sleeve (11) is fitted around the outer periphery of the support member (2), the connecting disc (13) is connected to the inner sleeve (11) and the outer sleeve (12) on a side away from the friction plate group (21) such that the connecting disc (13), the inner sleeve (11) and the outer sleeve (12) enclose the annular mounting groove, and the first oil hole (4) and the third oil hole (42) are both provided on the inner sleeve (11).

3. The piston device for a clutch according to claim 2, wherein the main piston (3) includes a main piston inner cylinder (32) and a main piston push disk (33) disposed on a side of the main piston inner cylinder (32) away from the friction plate group (21), the main piston inner cylinder (32) is fitted over an outer periphery of the inner sleeve (11) and is in sliding fit with the inner sleeve (11) along an axial direction thereof, and an outer ring of the main piston push disk (33) is supported on an inner wall of the outer sleeve (12).

4. The piston device for a clutch according to claim 3, characterized in that the second oil hole (41) is plural, each of the second oil holes (41) is provided on the main piston inner cylinder (32) in a circumferential direction of the main piston inner cylinder (32), two first seals (6) are provided between the main piston inner cylinder (32) and the inner sleeve (11), and the two first seals (6) are provided on both sides of the second oil hole (41), respectively.

5. The piston device for a clutch according to claim 4, wherein an annular oil groove (43) is provided in an outer periphery of the inner sleeve (11), the annular oil groove (43) communicates with the third oil hole (42), and one end of each of the second oil holes (41) communicates with the annular oil groove (43) and the other end communicates with the balance piston chamber (51).

6. A piston arrangement for a clutch according to claim 3, characterized in that the inner ring of the balance piston (5) is supported on the outer periphery of the main piston inner cylinder (32) and is in sliding engagement with the main piston inner cylinder (32), and the outer ring of the balance piston (5) is supported on the inner wall of the outer sleeve (12) and is in positive engagement with the outer sleeve (12).

7. Piston device for a clutch according to claim 6, characterized in that a snap spring (7) for limiting the balance piston (5) is arranged on the inner wall of the outer sleeve (12), and the snap spring (7) is supported on the side of the balance piston (5) facing the friction plate set (21).

8. The piston device for the clutch according to claim 3, wherein a first mounting cavity is formed in one side, away from the friction plate set (21), of the balance piston (5), a first supporting seat (8) is arranged in the first mounting cavity, a second mounting cavity is formed in one side, facing the friction plate set (21), of the main piston push disc (33), a second supporting seat (81) is arranged in the second mounting cavity, the first supporting seat (8) and the second supporting seat (81) are arranged oppositely, the resetting piece comprises a resetting spring (9), and two ends of the resetting spring (9) are respectively sleeved on the first supporting seat (8) and the second supporting seat (81).

9. A piston device for a clutch according to claim 3, characterized in that the first oil hole (4) is inclined toward a direction away from the friction plate group (21), the master piston push disc (33) is connected with the master piston (3) sleeve in an arc, and the oil outlet end of the first oil hole (4) is opposite to the connection of the master piston push disc (33) and the master piston (3) sleeve.