Clutch piston cavity structure

Abstract

The utility model relates to the technical field of fluid driven clutches, in particular to a clutch piston cavity structure. A clutch piston cavity structure comprises a transmission shaft and a piston arranged on the transmission shaft in a sleeving mode, and a cavity space exists between the transmission shaft and the piston. And a shaft rod of the transmission shaft is provided with an oil hole which is communicated with the cavity space. A cavity space is formed by the piston and the transmission shaft, so that a clutch system is compact in structure, the axial size and the radial size of the clutch are shortened, meanwhile, the manufacturing process is simplified, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid driven clutches, in particular to a clutch piston cavity structure. Background Art

[0002] In a typical wet clutch, the piston cavity is composed of components such as a piston, an outer hub, a spline shaft, and a sealing ring. The spline shaft is installed on the transmission shaft through an internal spline, and the outer hub is connected to the spline shaft by welding or other means. The piston and the sealing ring together with the spline shaft and the outer hub form a closed cavity. Prior art US6705447B2 is a hydraulically operated clutch for an automatic transmission, including a clutch housing assembly having a clutch group positioned therein. A movable piston is fixed in the clutch housing assembly, and an expandable chamber is formed between the piston and the clutch housing assembly. Pressurized fluid is provided to the expandable chamber to enable the piston to move between the engaged position and the disengaged position relative to the clutch assembly. The inventor believes that the cavity structure is complicated, the process requirements are high, and the clutch system occupies a larger radial layout space and axial layout space, resulting in an increase in the weight and manufacturing cost of the clutch system, and there is room for improvement. Utility Model Content

[0003] In order to reduce the components of the piston cavity structure and reduce the axial and radial dimensions of the clutch system, the utility model provides a clutch piston cavity structure, wherein the cavity structure includes a transmission shaft and a piston sleeved on the transmission shaft, and there is a cavity space between the rotating shaft and the piston; the shaft of the transmission shaft is provided with an oil hole connected to the cavity space; the transmission shaft includes a shaft portion and an end face portion; when the cavity structure is in the original state, the piston fits the end face portion of the transmission shaft; when the pressure of the cavity structure increases, the piston moves away from the end face portion of the transmission shaft along the shaft portion of the transmission shaft. This solution uses the piston and the transmission shaft to directly form the cavity space, simplifies the structure of the clutch piston cavity, shortens the axial and radial dimensions of the clutch system, and makes the clutch system compact; the outer shapes of the piston and the transmission shaft directly form the cavity space, reducing the number of components.

[0004] Preferably, a clutch plate group is provided on the side of the piston away from the end surface portion, a clutch outer hub is disposed on the outer sleeve of the end surface portion, and the clutch plate group is connected to the clutch outer hub.

[0005] Preferably, the piston is provided with a plurality of bosses evenly distributed around the circumference, the bosses abut against the end face of the transmission shaft, and the end face is provided with a first groove to cooperate with the bosses. The bosses are used to replace the end face of the piston in contact with the end face of the transmission shaft, thereby reducing the parts of the piston that are prone to wear; since the piston needs to move along the shaft of the transmission rod, the outer wall and the inner wall of the piston are clearance-matched with the transmission shaft, and the bosses limit the relative rotation of the piston and the transmission shaft when they are in contact.

[0006] Preferably, the rotating shaft is provided with at least two oil holes, the oil holes including a first oil hole and a second oil hole, and when the piston contacts the end surface portion of the transmission shaft, the first oil hole is connected to the cavity space. Using multiple oil holes to provide fluid inlet and outlet is conducive to controlling the flow rate of the fluid by controlling the conduction state of the oil holes, thereby controlling the movement rate of the piston.

[0007] Preferably, the outer wall of the piston is provided with a first sealing groove, the inner wall of the inner ring of the piston that contacts the shaft rod of the transmission shaft is provided with a second sealing groove, an outer sealing ring is provided in the first sealing groove, and an inner sealing ring is provided in the second sealing groove. Since the piston and the transmission shaft directly form a cavity space, in order to prevent leakage of the fluid in the cavity space, the first sealing groove and the second sealing groove are provided to ensure that the fluid in the cavity space does not leak in the working state, and to avoid sliding friction between the piston and the clutch plate group.

[0008] Preferably, the transmission shaft includes a second groove, and the second groove is provided at the connection between the oil hole of the transmission shaft and the cavity space. Since the gap between the piston and the oil hole is small, the second groove prevents the formation of an oil film between the oil hole and the piston, so that the oil inflow into the cavity space is smooth.

[0009] Preferably, an elastic body is provided on one side of the piston away from the cross-section, and an elastic contact portion is provided on the piston at a position corresponding to the elastic body. After the piston moves along the shaft portion, the elastic body is compressed, and after the pressure in the cavity space is reduced, the piston can be pushed to reset.

[0010] Preferably, the piston includes a clutch contact portion. When the pressure in the cavity space increases, the piston compresses the elastic body until the clutch contact portion contacts the clutch plate group. The movement of the piston can change the conduction state between the second oil hole and the cavity space. The clutch contact portion presses the clutch plate group, so that the piston and the clutch plate group are in smooth contact and transmit the power of the transmission shaft. The conduction state between the second oil hole and the cavity space is changed by the movement of the piston, that is, when it is clear that the piston needs to contact or leave the clutch plate group, the movement rate of the piston stroke is increased.

[0011] Preferably, the second oil hole is a tapered hole, and the diameter of the tapered hole on the side close to the cavity space is smaller than the diameter of the side away from the cavity space. The elastic body pushes the piston to stop contacting the clutch plate group, so that the piston returns to the initial state. The second oil hole is a tapered hole, which speeds up the oil discharge rate of the cavity space and further speeds up the rate at which the piston returns to the initial state.

[0012] The utility model solves the problem that the cavity structure of the prior art is complicated, the process requirements are high, and the clutch system occupies a larger radial arrangement space and axial arrangement space, resulting in an increase in the weight and manufacturing cost of the clutch system. The utility model provides a clutch piston cavity structure, modifies the piston shape, uses the piston and the transmission shaft to directly form the cavity space, simplifies the structure of the clutch piston cavity, shortens the axial size and radial size of the clutch system, and makes the clutch system compact; the shape of the piston and the transmission shaft directly constitutes the cavity space, reducing the number of parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the implementation or the prior art description. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is an enlarged schematic diagram of the structure of the utility model;

[0016] Figure 3 It is a structural schematic diagram of the transmission shaft of the utility model;

[0017] Figure 4 It is a structural schematic diagram of the piston of the utility model;

[0018] Figure 5 Another structural schematic diagram of the piston of the utility model;

[0019] Figure 6 This is a structural schematic diagram of another solution of the utility model.

[0020] Explanation of the reference numerals: 1 piston; 2 transmission shaft; 3 clutch outer hub; 4 clutch plate group; 5 first oil hole; 6 elastomer 7 outer sealing ring; 8 inner sealing ring; 9 cavity space; 10 second oil hole; 101 clutch contact part; 102 boss; 103 elastic contact part; 104 transmission connection part; 201 end face part; 202 shaft part; 203 first groove; 204 second groove. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] Embodiment 1

[0023] like Figure 1 As shown, the utility model provides a clutch piston 1 cavity structure, the clutch piston 1 cavity structure includes a transmission shaft 2, a piston 1 sleeved on the transmission shaft 2, an inner sealing ring 8, an outer sealing ring 7, an elastomer 6, a clutch plate group 4, and a clutch outer hub 3, the rotating shaft and the piston 1 form a cavity space 9; the shaft of the transmission shaft 2 is provided with an oil hole connected to the cavity space 9, the oil hole supplies hydraulic oil from the inside of the shaft to the cavity space 9, thereby increasing the pressure of the cavity space 9; the transmission shaft 2 includes a shaft portion 202 and an end face portion 201; when the cavity space 9 is in an original state, the piston 1 fits the end face portion 201 of the transmission shaft 2; when the pressure of the cavity space 9 increases, the piston 1 moves along the shaft portion 202 of the transmission shaft 2 and away from the end face portion 201 of the transmission shaft 2.

[0024] This solution uses the piston 1 and the transmission shaft 2 to directly form the cavity space 9, which simplifies the structure of the clutch piston 1 cavity, shortens the axial and radial dimensions of the clutch system, and makes the clutch system compact; the outer shapes of the piston 1 and the transmission shaft 2 directly form the cavity space 9, and the inner sealing ring 8 and the outer sealing ring 7 are used to seal the cavity space 9 to reduce the number of parts.

[0025] A clutch plate group 4 is provided on the side of the piston 1 away from the end surface portion 201, and the end surface portion 201 is covered with a clutch outer hub 3, and the clutch plate group 4 is connected to the clutch outer hub 3. The piston 1 includes a clutch contact portion 101, and when the pressure in the cavity structure increases, the clutch contact portion 101 of the piston 1 first contacts the clutch plate group 4. The clutch contact portion 101 presses the clutch plate group 4, so that the piston 1 contacts the clutch plate group 4 smoothly and transmits the power of the transmission shaft 2. When the piston 1 moves away from the end surface portion 201 of the transmission shaft 2 along the shaft portion 202 of the transmission shaft 2, the piston 1 compresses the elastic body 6 until the clutch contact portion 101 of the piston 1 contacts the clutch plate group 4. The elastic body 6 pushes the piston 1 to stop contacting the clutch plate group 4, so that the piston 1 returns to the initial state.

[0026] Combination Figure 2 and Figure 4As shown, the piston 1 is provided with four arc-shaped bosses 102 evenly distributed around the circumference, and the bosses 102 abut against the end surface portion 201 of the transmission shaft 2, and the end surface portion 201 is provided with a first groove 203 to cooperate with the bosses 102. The bosses 102 are used to replace the end surface of the piston 1 in contact with the end surface portion 201 of the transmission shaft 2, thereby reducing the parts of the piston 1 that are prone to wear; since the piston 1 needs to move along the shaft portion 202 of the transmission rod, the outer wall and the inner wall of the piston 1 are clearance-matched with the transmission shaft 2, and the bosses 102 limit the relative rotation of the piston 1 and the transmission shaft 2 when they are in contact,

[0027] Combination Figure 2 , Figure 3 and Figure 4 As shown, the outer wall of the piston 1 is provided with a first sealing groove, the inner ring of the piston 1 is provided with a second sealing groove in the transmission connection part 104 in contact with the shaft part 202 of the transmission shaft 2, the first sealing groove is provided with an outer sealing ring 7, and the second sealing groove is provided with an inner sealing ring 8. Since the piston 1 and the transmission shaft 2 directly form a cavity space 9, in order to prevent the leakage of the fluid in the cavity space 9, the first sealing groove and the second sealing groove are provided to ensure that the fluid in the cavity space 9 does not leak in the working state, and to avoid sliding friction between the piston 1 and the clutch plate group 4.

[0028] like Figure 3 As shown, the transmission shaft 2 includes a second groove 204, and the second groove 204 is provided at the connection between the oil hole of the transmission shaft 2 and the cavity space 9. Since the gap between the piston 1 and the oil hole is small, the second groove 204 prevents the formation of an oil film between the oil hole and the piston 1, so that the oil inlet into the cavity space 9 is smooth.

[0029] Combination Figure 1 and Figure 5 As shown, the piston 1 is provided with an elastic body 6 on one side away from the cross-section portion, and the piston 1 is provided with an elastic contact portion 103 at a position corresponding to the elastic body 6. After the piston 1 moves along the shaft portion 202, the elastic body 6 is compressed, and after the pressure in the cavity space 9 is reduced, the piston 1 can be pushed to reset.

[0030] Embodiment 2

[0031] like Figure 6As shown, the difference between this embodiment and the first embodiment is that the second oil hole 10 is used to assist the first oil hole 5 in controlling the fluid pressure in the cavity space 9. The second oil hole 10 is closer to the oil inlet and outlet ends than the first oil hole 5. When the second oil hole 10 is working, the overall flow rate of the inlet and outlet fluid increases, and the inlet and outlet efficiency of the second oil hole 10 is higher. When the piston 1 moves to the second oil hole 10 to be turned on or the second oil hole 10 is closed, the movement rate of the piston 1 will be significantly accelerated, which is beneficial to shorten the response time of the clutch. The second oil hole 10 is a tapered hole in this solution. The tapered hole further increases the oil outlet rate of the cavity space 9, which can increase the rate at which the piston 1 returns to the initial position, further shortening the response time of the clutch.

[0032] The utility model solves the problem that the cavity structure of the prior art is complicated, the process requirements are high, and the clutch system occupies a larger radial arrangement space and axial arrangement space, resulting in an increase in the weight and manufacturing cost of the clutch system. The utility model provides a clutch piston 1 cavity structure, which uses the piston 1 and the transmission shaft 2 to directly form the cavity space 9, simplifies the structure of the clutch piston 1 cavity, shortens the axial size and radial size of the clutch system, and makes the clutch system compact; the outer shape of the piston 1 and the transmission shaft 2 directly forms the cavity space 9, reducing the number of parts.

[0033] The embodiments and / or implementation methods described above are only used to illustrate the preferred embodiments and / or implementation methods for realizing the technology of the utility model, and are not intended to limit the implementation methods of the technology of the utility model in any form. Any technical personnel in this field may make slight changes or modifications to other equivalent embodiments without departing from the scope of the technical means disclosed in the content of the utility model, but they should still be regarded as technologies or embodiments that are essentially the same as the utility model.

Claims

1. A clutch piston cavity structure, the cavity structure comprising a transmission shaft (2) and a piston (1) sleeved on the transmission shaft (2), characterized in that: There is a cavity space (9) between the transmission shaft (2) and the piston (1); the shaft of the transmission shaft (2) is provided with an oil hole connected to the cavity space (9), the transmission shaft (2) comprises a second groove (204), and the second groove (204) is provided at the connection between the oil hole of the transmission shaft (2) and the cavity space (9); the transmission shaft (2) comprises a shaft portion (202) and an end surface portion (201); when the cavity structure is in an original state, the piston (1) fits the end surface portion (201) of the transmission shaft (2); when the pressure of the cavity structure increases, the piston (1) moves along the shaft portion (202) of the transmission shaft (2) and away from the end surface portion (201) of the transmission shaft (2).

2. A clutch piston cavity structure according to claim 1, characterized in that: A clutch plate group (4) is provided on the side of the piston (1) away from the end surface portion (201); a clutch outer hub (3) is disposed on the outer sleeve of the end surface portion (201); and the clutch plate group (4) is connected to the clutch outer hub (3).

3. A clutch piston cavity structure according to claim 2, characterized in that: The piston (1) is provided with a plurality of bosses (102) evenly distributed around the circumference, the bosses (102) abutting against an end surface portion (201) of the transmission shaft (2), and the end surface portion (201) is provided with a first groove (203) cooperating with the bosses (102).

4. A clutch piston cavity structure according to claim 2 or 3, characterized in that: The transmission shaft (2) is provided with at least two oil holes, the oil holes comprising a first oil hole (5) and a second oil hole (10), and when the piston (1) contacts the end surface portion (201) of the transmission shaft (2), the first oil hole (5) is in communication with the cavity space (9).

5. A clutch piston cavity structure according to claim 4, characterized in that: The outer wall of the piston (1) is provided with a first sealing groove, the transmission connection portion (104) where the inner ring of the piston (1) contacts the shaft portion (202) of the transmission shaft (2) is provided with a second sealing groove, an outer sealing ring (7) is provided in the first sealing groove, and an inner sealing ring (8) is provided in the second sealing groove.

6. A clutch piston cavity structure according to claim 5, characterized in that: An elastic body (6) is provided on a side of the piston (1) away from the end surface portion (201), and an elastic contact portion (103) is provided on the piston (1) at a position corresponding to the elastic body (6).

7. A clutch piston cavity structure according to claim 6, characterized in that: The piston (1) comprises a clutch contact portion (101). When the pressure in the cavity space (9) increases, the piston (1) compresses the elastic body (6) until the clutch contact portion (101) contacts the clutch plate group (4). The movement of the piston (1) can change the conduction state between the second oil hole (10) and the cavity space (9).

8. A clutch piston cavity structure according to claim 7, characterized in that: The second oil hole (10) is a tapered hole, and the diameter of the tapered hole on a side close to the cavity space (9) is smaller than the diameter of the side away from the cavity space (9).

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