阅读说明：本技术 一种湿式离合器及其磨损量检测方法 (Wet clutch and abrasion loss detection method thereof ) 是由 樊雪来 唐立中 张艳慧 宋建军 于 2021-11-01 设计创作，主要内容包括：本发明涉及车辆技术领域,公开一种湿式离合器及其磨损量检测方法,湿式离合器包括：输入轴；输出轴；驱动组件,驱动组件连接于输入轴,驱动组件包括活塞和活塞腔,活塞腔中通入用于驱动活塞的压力油；摩擦片组件,摩擦片组件的外径端连接于输入轴,摩擦片组件的内径端与输出轴连接,活塞与摩擦片组件间隔设置且能够按压摩擦片组件实现输入轴和输出轴的传动；限位组件,限位组件包括间隔设置的第一限位件和第二限位件,第一限位件连接于活塞,第二限位件连接于驱动组件,第一限位件随活塞移动时能够被第二限位件阻挡限位,以限制活塞的位移。通过上述结构,该湿式离合器能够防止其中的摩擦片组件的磨损超出磨损限值,有利于保证变速器的安全。(The invention relates to the technical field of vehicles, and discloses a wet clutch and a wear loss detection method thereof, wherein the wet clutch comprises: an input shaft; an output shaft; the driving assembly is connected to the input shaft and comprises a piston and a piston cavity, and pressure oil for driving the piston is introduced into the piston cavity; the outer diameter end of the friction plate assembly is connected with the input shaft, the inner diameter end of the friction plate assembly is connected with the output shaft, and the piston and the friction plate assembly are arranged at intervals and can press the friction plate assembly to realize transmission of the input shaft and the output shaft; the limiting assembly comprises a first limiting part and a second limiting part which are arranged at intervals, the first limiting part is connected to the piston, the second limiting part is connected to the driving assembly, and the first limiting part can be stopped by the second limiting part to limit when moving along with the piston so as to limit the displacement of the piston. Through the structure, the wet clutch can prevent the abrasion of the friction plate component in the wet clutch from exceeding an abrasion limit value, and is favorable for ensuring the safety of the transmission.)

1. A wet clutch, comprising:

an input shaft (1);

an output shaft (2);

the driving assembly is connected to the input shaft (1) and comprises a piston (31) and a piston cavity (32), and pressure oil for driving the piston (31) is introduced into the piston cavity (32);

the outer diameter end of the friction plate assembly (4) is connected to the input shaft (1), the inner diameter end of the friction plate assembly (4) is connected with the output shaft (2), the piston (31) and the friction plate assembly (4) are arranged at intervals and can press the friction plate assembly (4) to realize transmission of the input shaft (1) and the output shaft (2);

the limiting assembly comprises a first limiting part (5) and a second limiting part (6) which are arranged at intervals, the first limiting part (5) is connected to the piston (31), the second limiting part (6) is connected to the driving assembly, and the first limiting part (5) can be blocked by the second limiting part (6) for limiting the displacement of the piston (31) when moving along with the piston (31).

2. Wet clutch according to claim 1, further comprising a return spring (7), wherein one end of the return spring (7) is fitted over the first retaining member (5) and the other end of the return spring (7) is fitted over the second retaining member (6).

3. A wet clutch according to claim 1, characterized in that the drive assembly further comprises a main shaft (8), an outer housing (9) is connected to the main shaft (8), the piston chamber (32) is formed between the outer housing (9) and the piston (31), the outer housing (9) is connected to the input shaft (1), and the outer diameter end of the friction plate assembly (4) is connected to the input shaft (1) through the outer housing (9).

4. A wet clutch according to claim 3, characterized in that a baffle (10) is provided on the spindle (8), and the second retaining element (6) is connected to the baffle (10).

5. A wet clutch according to claim 3, characterised in that the main shaft (8) is provided with an oil channel (81), the oil channel (81) being in communication with the piston chamber (32), the oil channel (81) being adapted to feed the pressure oil to the piston chamber (32).

6. A wet clutch according to claim 3, further comprising an inner housing (11), the inner housing (11) being connected to the output shaft (2), the inner diameter end of the friction plate assembly (4) being connected to the output shaft (2) through the inner housing (11).

7. Wet clutch according to claim 6, characterized in that it further comprises a drive plate (12), said drive plate (12) being connected between said input shaft (1) and said outer housing (9).

8. A wet clutch according to claim 7, characterized in that the outer diameter end of the friction plate pack (4) and the drive plate (12) are splined to the outer housing (9) and axially positioned by a snap ring (13), and the inner diameter end of the friction plate pack (4) is splined to the inner housing (11).

9. A wet clutch according to claim 1, characterized in that it further comprises a bearing (14), said bearing (14) being interposed between said input shaft (1) and said output shaft (2).

10. A method of detecting an amount of wear of a wet clutch for detecting an amount of wear of a friction plate member (4) in a wet clutch according to any one of claims 1 to 9, comprising:

setting the wear limit value of the friction plate assembly (4) to be delta L, setting a gap between a piston (31) and the friction plate assembly (4) to be S1, and setting a gap between a first limiting member (5) and a second limiting member (6) to be S2, wherein S2 is S1+ delta L;

continuously increasing the pressure of the pressure oil in a piston cavity (32) of the wet clutch to enable the piston (31) to move towards the friction plate assembly (4) until the piston (31) reaches an extreme position and can not move any more;

detecting whether torque is transmitted between the output shaft (2) and the input shaft (1), if so, the abrasion of the friction plate assembly (4) does not exceed the abrasion limit value; if not, the wear of the friction plate assembly (4) reaches the wear limit value.

Technical Field

The invention relates to the technical field of vehicles, in particular to a wet clutch and a wear loss detection method thereof.

Background

The clutch is one of key parts of the automobile, and the wet clutch has the advantages of high reliability, high stability, high comfort and the like, so that the wet clutch is widely applied to an automobile transmission system.

The wet clutch plays a starting role in the double-clutch automatic transmission, and plays a shifting role in the AT automatic transmission and the hybrid transmission. Because the wet clutch usually works under the condition of large sliding friction difference, cooling oil needs to be introduced for continuous cooling, once the sliding friction difference exceeds the allowable range, or a cooling system fails to provide the cooling oil in time, the friction plate of the clutch is abnormally worn, if excessive wear cannot be found in time, the friction plate is continuously used on a vehicle, the oil pollution of the transmission can be caused, and the hydraulic system or the transmission assembly is failed and scrapped.

At present, the wear condition of the wet clutch can be estimated only by the experience of a driver, a scheme for identifying excessive wear of a friction plate in advance is not available, once the clutch is abnormally worn, only a complete transmission can be replaced, and certain economic loss is brought.

Disclosure of Invention

An object of the present invention is to provide a wet clutch capable of preventing wear of a friction plate assembly therein from exceeding a wear limit, which is advantageous for securing a transmission.

In order to achieve the purpose, the invention adopts the following technical scheme:

a wet clutch, comprising:

an input shaft;

an output shaft;

the driving assembly is connected to the input shaft and comprises a piston and a piston cavity, and pressure oil for driving the piston is introduced into the piston cavity;

the outer diameter end of the friction plate assembly is connected to the input shaft, the inner diameter end of the friction plate assembly is connected with the output shaft, the piston and the friction plate assembly are arranged at intervals and can press the friction plate assembly to realize transmission of the input shaft and the output shaft;

the limiting assembly comprises a first limiting part and a second limiting part which are arranged at intervals, the first limiting part is connected to the piston, the second limiting part is connected to the driving assembly, and the first limiting part can be stopped and limited by the second limiting part when moving along with the piston so as to limit the displacement of the piston.

As a preferable scheme of the wet clutch, the wet clutch further includes a return spring, one end of the return spring is sleeved on the first limiting member, and the other end of the return spring is sleeved on the second limiting member.

As a preferred scheme of a wet clutch, the drive assembly further comprises a main shaft, an outer shell is connected to the main shaft, a piston cavity is formed between the outer shell and the piston, the outer shell is connected with the input shaft, and the outer diameter end of the friction plate assembly is connected with the input shaft through the outer shell.

As a preferable mode of the wet clutch, a baffle is provided on the spindle, and the second limiting member is connected to the baffle.

As a preferable scheme of the wet clutch, an oil passage is arranged on the main shaft, the oil passage is communicated with the piston cavity, and the oil passage is used for introducing the pressure oil into the piston cavity.

As a preferable aspect of the wet clutch, the wet clutch further includes an inner housing connected to the output shaft, and an inner diameter end of the friction plate assembly is connected to the output shaft through the inner housing.

As a preferable aspect of the wet clutch, the wet clutch further includes a drive plate connected between the input shaft and the outer housing.

As a preferable mode of the wet clutch, an outer diameter end of the friction plate assembly and the drive plate are splined to the outer housing and axially positioned by a snap ring, and an inner diameter end of the friction plate assembly is splined to the inner housing.

As a preferable aspect of the wet clutch, the wet clutch further includes a bearing interposed between the input shaft and the output shaft.

Another object of the present invention is to provide a method for detecting a wear amount of a wet clutch, which can quickly determine whether the wear of a friction plate assembly exceeds a wear limit, and can effectively avoid the continuous use of the friction plate assembly after the wear limit is exceeded, thereby being beneficial to ensuring the safety of a transmission.

In order to achieve the purpose, the invention adopts the following technical scheme:

a method for detecting a wear amount of a friction plate assembly in a wet clutch according to any one of the above aspects, comprising:

setting a wear limit value of the friction plate assembly to be DeltaL, setting a gap between the piston and the friction plate assembly to be S1, and setting a gap between the first limiting member and the second limiting member to be S2, wherein S2 is S1+ DeltaL;

continuously increasing the pressure of pressure oil in a piston cavity of the wet clutch to enable the piston to move towards the friction plate assembly until the piston reaches an extreme position and cannot move any more;

detecting whether torque is transmitted between the output shaft and the input shaft, if so, the abrasion of the friction plate assembly does not exceed the abrasion limit value; if not, the wear of the friction plate assembly has reached the wear limit.

The invention has the beneficial effects that:

the invention provides a wet clutch which comprises an input shaft, an output shaft, a driving assembly, a friction plate assembly and a limiting assembly, wherein pressure oil is communicated in a piston cavity of the driving assembly to drive a piston to press the friction plate assembly to realize transmission of the input shaft and the output shaft, the limiting assembly comprises a first limiting piece and a second limiting piece which are arranged at intervals, the first limiting piece is connected to the piston, the second limiting piece is connected to the driving assembly, the first limiting piece can be blocked and limited by the second limiting piece when moving along with the piston, the limitation on the displacement of the piston is realized, the excessive pressing of the piston on the friction plate assembly is avoided, the friction plate assembly cannot be pressed by the piston again to be continuously worn after being thinned due to certain abrasion loss, the abrasion of the friction plate assembly is prevented from exceeding the abrasion limit value, and the safety of a transmission is ensured.

The invention also provides a method for detecting the wear amount of the wet clutch, which is used for detecting whether the friction plate assembly in the wet clutch provided by the technical scheme reaches the wear limit, the pressure of pressure oil in a piston cavity of the wet clutch is continuously increased to enable the displacement of the piston to reach S2 by setting the gap S2 between the first limiting piece and the second limiting piece to be equal to the sum of the wear limit value Delta L of the friction plate assembly and the gap between the piston and the friction plate assembly to be S1, and then whether torque is transmitted between the output shaft and the input shaft is detected, if so, the wear of the friction plate assembly does not exceed the wear limit value; if not, the wear of the friction plate assembly has reached a wear limit. The method can quickly judge whether the abrasion of the friction plate assembly exceeds the abrasion limit value, can effectively avoid the continuous use of the friction plate assembly exceeding the abrasion limit value, and is beneficial to ensuring the safety of the transmission.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a wet clutch provided in an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a limit assembly of a wet clutch according to an embodiment of the present invention;

figure 3 is a schematic diagram comparing friction plate assemblies in a wet clutch before and after wear according to an embodiment of the present invention.

In the figure:

1. an input shaft; 2. an output shaft; 31. a piston; 32. a piston cavity; 4. a friction plate assembly; 5. a first limit piece; 6. a second limiting member; 7. a return spring; 8. a main shaft; 81. an oil passage; 9. an outer housing; 10. a baffle plate; 11. an inner housing; 12. a drive disc; 13. a snap ring; 14. and a bearing.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first feature is directly connected to the second feature, or that the first feature is not directly connected to the second feature but is connected to the second feature via another feature. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the wet clutch and the method for detecting the wear amount thereof provided by the invention is further described by the specific implementation mode with reference to the accompanying drawings.

The present embodiment provides a wet clutch, as shown in fig. 1, the wet clutch includes an input shaft 1, an output shaft 2, a driving assembly and a friction plate assembly 4, the driving assembly is connected to the input shaft 1, the driving assembly includes a piston 31 and a piston cavity 32, the piston cavity 32 is used for introducing pressure oil with a certain pressure, and the pressure oil is used for driving the piston 31 to move. The outer diameter end of the friction plate assembly 4 is connected to the input shaft 1, the inner diameter end of the friction plate assembly 4 is connected with the output shaft 2, the piston 31 and the friction plate assembly 4 are arranged at intervals, and the piston 31 can press the friction plate assembly 4 under the driving of pressure oil in the piston cavity 32 to realize transmission between the input shaft 1 and the output shaft 2. Preferably, the wet clutch further comprises a bearing 14, the bearing 14 is clamped between the input shaft 1 and the output shaft 2, so that the input shaft 1 and the output shaft 2 can rotate relatively, the bearing 14 is arranged so that the input shaft 1 and the output shaft 2 can be attached and can rotate relatively, so that the input shaft 1 and the output shaft 2 can be compactly arranged, and the space utilization rate in the wet clutch is improved.

In this embodiment, the driving assembly further includes a main shaft 8, an outer housing 9 is connected to the main shaft 8, and a piston cavity 32 is formed between the outer housing 9 and the piston 31, so that when pressure oil with a certain pressure is introduced into the piston cavity 32, the piston 31 can operate. In the present embodiment, the main shaft 8 is provided with an oil passage 81, the oil passage 81 is communicated with the piston cavity 32, and the oil passage 81 is used for introducing pressure oil into the piston cavity 32.

Preferably, the outer housing 9 is connected to the main shaft 8 by welding, so that the outer housing 9 is tightly and firmly connected to the main shaft 8, which is beneficial to prevent the piston cavity 32 from leaking. In the present embodiment, the wet clutch further includes a drive plate 12, and the drive plate 12 is connected between the input shaft 1 and the outer housing 9, so that power transmission between the input shaft 1 and the outer housing 9 is realized. Specifically, the inner diameter end of the driving disc 12 is connected to the outer peripheral surface of the input shaft 1 by welding, so that the driving disc 12 is firmly connected with the input shaft 1; be equipped with first spline groove on the inner wall of shell body 9, the external diameter end of driving-disc 12 passes through the spline connection on the inner wall of shell body 9, has realized the power transmission of input shaft 1 and shell body 9.

In the present embodiment, the outer diameter end of the friction plate assembly 4 is connected to the inner wall of the outer casing 9, so that the power transmitted from the input shaft 1 can be transmitted to the outer diameter end of the friction plate assembly 4 through the driving disc 12 and the outer casing 9; meanwhile, the outer shell 9 and the main shaft 8 can also play a certain structural and supporting role, so that the structural arrangement of the wet clutch is convenient. Specifically, the outer diameter end of the friction plate assembly 4 is connected to the inner wall of the outer shell 9 through a spline, so that the friction plate assembly 4 is in transmission connection with the outer shell 9. Preferably, the wet clutch further comprises a snap ring 13, wherein the snap ring 13 is snapped in a first spline groove on the inner wall of the outer shell 9 to axially position the friction plate assembly 4 and the driving disk 12.

Preferably, the wet clutch further includes an inner housing 11, the inner housing 11 is connected to the output shaft 2, and the inner diameter end of the friction plate assembly 4 is connected to the inner housing 11 and connected to the output shaft 2 through the inner housing 11. Specifically, the inner diameter end of the inner housing 11 is connected to the output shaft 2 by welding, so that the inner housing 11 and the output shaft 2 are firmly connected; be equipped with the second spline groove on the outer peripheral face of interior casing 11, the internal diameter end of friction disc subassembly 4 passes through splined connection in interior casing 11, has realized that friction disc subassembly 4 is connected through the transmission of interior casing 11 and output shaft 2.

In this embodiment, as shown in fig. 2, the wet clutch further includes a return spring 7, one end of the return spring 7 is connected to the piston 31, and the other end is connected to the main shaft 8, and the return spring 7 is a compression spring with a certain pre-tightening force for providing a restoring force for the piston 31.

Preferably, the wet clutch further comprises a limiting assembly, the limiting assembly comprises a first limiting member 5 and a second limiting member 6 which are arranged at intervals, the first limiting member 5 is connected to the piston 31, the second limiting member 6 is connected to the driving assembly, the first limiting member 5 can be blocked and limited by the second limiting member 6 when moving along with the piston 31 so as to limit the displacement of the piston 31, and excessive pressing of the piston 31 on the friction plate assembly 4 is avoided, so that the friction plate assembly 4 cannot be pressed by the piston 31 to be continuously worn after being thinned due to certain abrasion loss, and the abrasion of the friction plate assembly 4 is prevented from exceeding the abrasion limit value, and the safety of the transmission is ensured.

Specifically, one end of the return spring 7 is sleeved on the first limiting member 5, and the other end of the return spring 7 is sleeved on the second limiting member 6, so that the return spring 7 is positioned. Further, a baffle 10 is further arranged on the main shaft 8, and the second limiting piece 6 is connected to the baffle 10, so that the second limiting piece 6 is conveniently connected with the main shaft 8.

The present embodiment further provides a method for detecting a wear amount of a wet clutch, which is used to detect a wear amount of a friction plate assembly 4 in the wet clutch provided in the above technical solution, and the method for detecting a wear amount of a wet clutch includes:

setting the wear limit of the friction plate assembly 4 to Δ L, the clearance between the piston 31 and the friction plate assembly 4 to S1, and the clearance between the first limiting member 5 and the second limiting member 6 to S2, where S2 is equal to S1+ Δ L.

As shown in fig. 3, the wear limit Δ L of the friction plate assembly 4 is the difference between the thickness L1 of the friction plate assembly 4 before wear and the thickness L1 of the friction plate assembly 4 that is not reusable after wear. When the friction plate assembly 4 has worn to some extent, the thickness of the friction plate assembly 4 will decrease from an initial thickness of L1, and when the wear exceeds a wear limit of Δ L, the thickness of the friction plate assembly 4 will decrease to L2. The wear limit Δ L of the friction plate assembly 4 is set by a person skilled in the art according to the material of the friction plate assembly 4, the oil condition of the transmission, etc., for the purpose of preventing a malfunction of the hydraulic system or the transmission assembly.

The pressure of the pressurized oil in the piston chamber 32 of the wet clutch is increased continuously, so that the piston 31 moves towards the friction plate assembly 4 until the piston 31 reaches the limit position and cannot move any more.

That is, the pressure oil is continuously introduced into the piston chamber 32 through the oil passage 81, the pressure of the pressure oil in the piston chamber 32 of the wet clutch is continuously increased, and the piston 31 is continuously pressed against the friction plate assembly 4 by the action of the pressure oil in the piston chamber 32 until the piston 31 reaches the limit position and cannot move any more. It should be noted that there are two cases of the extreme positions: firstly, when the abrasion of the friction plate assembly 4 does not exceed the abrasion limit value, the piston 31 presses the friction plate assembly 4, and the reaction force of the friction plate assembly 4 enables the piston 31 to be incapable of moving any more and reach the limit position; when the wear of the friction plate assembly 4 reaches the wear limit value and the stroke of the piston 31 reaches S2, the first limiting member 5 and the second limiting member 6 abut against each other, and the piston 31 cannot move any more and reaches the limit position.

Detecting whether torque is transmitted between the output shaft 2 and the input shaft 1, if so, the abrasion of the friction plate assembly 4 does not exceed an abrasion limit value; if not, the wear of friction plate assembly 4 has reached the wear limit.

That is, when the piston 31 reaches the limit position and cannot move any more, it is detected whether torque is transmitted between the output shaft 2 and the input shaft 1, and if so, it indicates that the wear of the friction plate assembly 4 does not exceed the wear limit; if not, the abrasion of the friction plate component 4 reaches the abrasion limit value.

It is understood that when the piston 31 reaches the limit position and cannot move any more, if it is detected that no torque can be transmitted between the output shaft 2 and the input shaft 1, the piston 31 does not press the friction plate assembly 4, that is, the friction plate assembly 4 becomes thinner due to the wear reaching the wear limit Δ L, and even if the stroke of the piston 31 reaches S2, the piston 31 cannot press the friction plate assembly 4.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.