CN112524172B

CN112524172B - Axial double-clutch structure for hybrid power transmission

Info

Publication number: CN112524172B
Application number: CN202011371101.1A
Authority: CN
Inventors: 许青; 洪波昌; 张峻; 何正模; 魏军; 支峰; 唐师法
Original assignee: Wuxi Mingheng Hybrid Power Technology Co ltd
Current assignee: Wuxi Mingheng Hybrid Power Technology Co ltd
Priority date: 2020-11-30
Filing date: 2020-11-30
Publication date: 2022-03-22
Anticipated expiration: 2040-11-30
Also published as: CN112524172A

Abstract

The invention relates to an axial double clutch structure for a hybrid transmission, comprising: the power transmission mechanism comprises a shaft body, a connecting support, a pressure fluid channel, a cooling fluid channel, a liquid outlet and a liquid inlet flow channel, wherein the connecting support is sleeved outside the shaft body and is fixed with the peripheral surface of the shaft body; the power output mechanism comprises a first outer support, a cover plate, a check ring for a first hole, a first hub, a second hub and a motor shaft; the clutch mechanism fully utilizes radial space, has a simple structure and is convenient to mount, the maximum utilization rate of parts is realized on the premise of not increasing the difficulty of a manufacturing process, the parts in the traditional design are reduced, the cost is reduced, and the axial length of the clutch mechanism is also shortened.

Description

Axial double-clutch structure for hybrid power transmission

Technical Field

The invention belongs to the technical field of clutches, and particularly relates to an axial double-clutch structure for a hybrid power transmission.

Background

A dual clutch is a transmission component of relatively complex construction, the design of which is influenced by a number of factors, as well as being constrained in axial or radial space. Common double clutch mechanism adopts the mode that two clutches pile up mostly, is about to carry out radial arranging for two clutches, but the pile up of clutch needs bigger radial dimension, and its piston diameter is great moreover, and is higher to hydraulic system's pressure demand, and the structure is more complicated in addition, the design degree of difficulty is big, the processing technology nature is relatively poor scheduling problem.

However, the general axial double clutch is not high in space utilization rate below the clutch inner support, and therefore the axial length is increased, so that it is desirable to provide a double clutch mechanism which improves the utilization rate of each part, reduces the axial distance as much as possible, makes full use of the existing radial space, has a simple structure, and has good installation operability.

Disclosure of Invention

The present invention aims to overcome the disadvantages of the prior art and to provide an axial dual clutch structure for a hybrid transmission.

In order to achieve the purpose, the invention adopts the technical scheme that: an axial dual clutch structure for a hybrid transmission comprising:

the power transmission mechanism comprises a shaft body, a connecting support, a pressure fluid channel, a cooling fluid channel, a liquid outlet and a liquid inlet flow channel, wherein the connecting support is sleeved outside the shaft body and is fixed with the peripheral surface of the shaft body;

the power output mechanism comprises a first outer support, a cover plate, a first hole retainer ring, a first hub, a second hub and a motor shaft, wherein the first outer support is fixed with the motor shaft, the cover plate is in tooth-shaped meshing with the first outer support and is axially limited by the first hole retainer ring, the peripheral surface of the first hub is fixed with the cover plate and is connected with an output shaft through an internal spline, and the second hub is connected with another output shaft through an internal spline;

the second clutch mechanism is arranged on one side of the connecting support and comprises a second inner support, a second piston, a retainer ring for a second hole, a second friction plate group, a retainer ring for a second shaft, a disc spring, a balance piston, a second outer support and a balance cavity, the second inner support is sleeved outside the second hub and supported on the shaft body, the second outer support is sleeved outside the connecting support and fixed with the circumferential surface of the connecting support, the second friction plate group is arranged between the second inner support and the second outer support and limited by the retainer ring for the second hole, the second piston is sleeved on the circumferential surface of the shaft body, the outer edge of the second piston extends to be matched with the second friction plate group, the balance piston is sleeved on the shaft body, the balance cavity is formed by the second piston, the balance piston and the shaft body in a surrounding mode, and the disc spring is arranged in the balance cavity, the inner edge of the second piston is supported by the balance piston;

the second friction plate group comprises a second friction plate formed on the outer surface of the second inner support and a second pair of coupling plates formed on the inner surface of the second outer support and alternately matched with the second friction plate, the second piston respectively surrounds a closed second pressure cavity with the shaft body and the connecting support, and the second pressure cavity is communicated with the other corresponding liquid outlet;

the second clutch mechanism has a combined state and a separated state, when the second clutch mechanism is in the separated state, the outer edge of the second piston and the second friction plate set are arranged at intervals, when the second clutch mechanism is in the combined state, the outer edge of the second piston applies pressure to the second friction plate set, and under the limiting action of the second hole check ring, the second friction plate and the second counter plate are tightly attached.

Optimally, the clutch device also comprises a first clutch mechanism arranged on the other side of the connecting support, the first clutch mechanism comprises a first inner support, a first piston, a sealing plate, a first friction plate group, a first shaft snap ring and a spiral spring, the first inner support is sleeved outside the connecting support and is fixed with the circumferential surface of the connecting support, the first friction plate group is arranged between the first inner support and the first outer support, the first piston is sleeved on the circumferential surface of the shaft body, the outer edge of the first piston extends to the first friction plate group to be matched, the sealing plate is sleeved outside the first piston and is limited by the first shaft snap ring, the spiral spring is arranged between the first piston and the shaft body, the first friction plate group comprises a first friction plate sleeved on the outer surface of the first inner support and a first counter-couple plate which is formed on the inner surface of the first outer support and is alternately matched with the first friction plate, the first piston and the sealing plate are sleeved on the shaft body to form a first pressure cavity, and the first pressure cavity is communicated with one corresponding liquid outlet;

the first clutch mechanism has a combined state and a separated state, and when the first clutch mechanism is in the separated state, the outer edge of the first piston is arranged at an interval with the first friction plate set; when the first friction plate and the first counter plate are in a combined state, the outer edge of the first piston presses the first friction plate group, and the first friction plate and the first counter plate are tightly combined under the supporting action of the cover plate.

Preferably, the motor shaft and the first outer bracket, the cover plate and the first hub, the second inner bracket and the second hub, the shaft body and the connecting bracket, the first inner bracket and the connecting bracket, and the second outer bracket and the connecting bracket are all welded.

Preferably, a one-way valve is mounted on a sealing plate of the first clutch mechanism, an O-shaped ring is arranged at the position matched with the shaft body, and when the first clutch mechanism is in a separation state, retained oil in the first pressure cavity communicated with the corresponding liquid outlet can flow out through the one-way valve.

Optimally, the liquid inlet flow channel is respectively communicated with the cavity where the cooling fluid channel and the spiral spring in the first clutch mechanism are located, the cooling fluid channel and a balance cavity in the second clutch mechanism, and the cavity surrounded by a second inner support and a balance piston in the cooling fluid channel and the second clutch mechanism.

Preferably, a through hole is formed in the balance piston in the second clutch mechanism on the inner side supporting the contact point of the disc spring to adjust the balance relationship between the balance chamber and the second pressure chamber.

Preferably, a first communicating hole is formed in the first inner support corresponding to the first friction plate group, a second communicating hole is formed in the first outer support corresponding to the first friction plate group, a third communicating hole is formed in the second inner support corresponding to the second friction plate group, and a fourth communicating hole is formed in the second outer support corresponding to the second friction plate group.

Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: the invention relates to an axial double-clutch structure for a hybrid transmission.A first clutch mechanism and a second clutch mechanism which are independent and have specific structures are arranged on a power transmission mechanism, so that various power combinations can be realized by controlling four working conditions of independent combination of the first clutch mechanism, independent combination of the second clutch mechanism, simultaneous combination or simultaneous separation of the first clutch mechanism and the second clutch mechanism; the clutch mechanism fully utilizes radial space, has a simple structure and is convenient to mount, the maximum utilization rate of parts is realized on the premise of not increasing the difficulty of a manufacturing process, the parts in the traditional design are reduced, the cost is reduced, and the axial length of the clutch mechanism is also shortened.

Drawings

FIG. 1 is a cross-sectional view of a pressure fluid passageway according to the present invention;

FIG. 2 is a cross-sectional view of the lubrication fluid passage of the present invention;

description of reference numerals:

1. a first clutch mechanism; 11. a first inner support; 12. a first piston; 13. a sealing plate; 131. a one-way valve; 132. an "O" ring; 14. a first friction plate set; 141. a first pair of doublets; 142. a first friction plate; 15. a snap ring for the first shaft; 16. a coil spring;

2. a second clutch mechanism; 21. a second inner support; 22. a second piston; 23. a retainer ring for the second hole; 24. a second friction plate set; 241. a second pair of doublets; 242. a second friction plate; 25. a snap ring for the second shaft; 26. a disc spring; 27. a balance piston; 28. a second outer support; 29. a balancing chamber;

3. a power take-off mechanism; 31. a first outer support; 32. a cover plate; 33. a first hole retainer ring; 34. a first hub; 35. a second hub; 36. a motor shaft;

4. a power transmission mechanism; 41. a shaft body; 42. connecting a bracket; 43. a pressure fluid passage; 44. a cooling fluid channel; 45. a liquid outlet; 46. and a liquid inlet flow channel.

Detailed Description

The invention will be further described with reference to examples of embodiments shown in the drawings to which the invention is attached.

As shown in fig. 1 and 2, the axial dual clutch structure for a hybrid transmission mainly includes a first clutch mechanism 1, a second clutch mechanism 2, a power output mechanism 3, a power transmission mechanism 4, and the like.

The power transmission mechanism 4 mainly includes a shaft body 41, a connecting bracket 42, a pressure fluid passage 43, a cooling fluid passage 44, a liquid outlet 45, a liquid inlet flow passage 46, and the like; the connecting bracket 42 is sleeved outside the shaft 41 and fixed with the circumferential surface thereof. The pressure fluid passage 43 is provided in two ways circumferentially opened in the shaft body 41 and not communicated with each other for introducing the pressure fluid into the shaft body 41. The two liquid outlets 45 are provided in the shaft body 41 and are respectively communicated with the two pressure fluid passages 43 (i.e., one end of one liquid outlet 45 is communicated with one pressure fluid passage 43). The cooling fluid passage 44 is opened in the shaft body 41 (in the present embodiment, two pressure fluid passages 43 are symmetrically provided on the upper and lower sides of the cooling fluid passage 44). Three inlet channels 46 are provided and communicate with the cooling fluid channel 44.

The power output mechanism 3 mainly includes a first outer bracket 31, a cover plate 32, a first hole retainer 33, a first hub 34, a second hub 35, a motor shaft 36, and the like. The first outer support 31 is fixed with the motor shaft 36, the cover plate 32 is in tooth-shaped engagement with the first outer support 31 and is axially limited by the retainer ring 33 through the first hole, the cover plate 32 is fixed with the peripheral surface of the first hub 34, the first hub 34 is connected with an output shaft through an internal spline, and the second hub 35 is connected with another output shaft through an internal spline.

The first clutch mechanism 1 is disposed between the first outer bracket 31 and the shaft body 41, and mainly includes a first inner bracket 11, a first piston 12, a seal plate 13, a first friction plate group 14, a first shaft snap ring 15, a coil spring 16, and the like. The first inner bracket 11 is sleeved outside the connecting bracket 42 and is positioned inside the first outer bracket 31. The first friction plate set 14 is disposed between the first inner support 11 and the first outer support 31, and the first friction plate set 14 mainly includes a first friction plate 142 sleeved on the outer surface of the first inner support 11 and a first pair of coupling plates 141 sleeved on the inner surface of the first outer support 31 and alternately disposed with the first friction plate 142. The first piston 12 is sleeved on the peripheral surface of the shaft body 41, the outer edge of the first piston extends to be matched with the first friction plate group 14, the sealing plate 13 is sleeved outside the first piston 12 and limited by the first shaft snap ring 15, and the spiral spring 16 is arranged between the shaft body 41 and the first piston 12.

The first piston 12, the shaft body 41 and the sealing plate 13 enclose a sealed first pressure chamber (the outer edge of the first piston 12 and the inner wall of the sealing plate 13 form a sealed structure), and the first pressure chamber is communicated with a corresponding one of the liquid outlets 45, and the coil spring 16 is disposed between the shaft body 41 and the first piston 12, so that the first piston 12 after the first pressure chamber is decompressed can return to an initial position.

The first clutch mechanism 1 has two states of engagement and disengagement, and when in the disengaged state, the outer edge of the first piston 12 is spaced from the first friction plate set 14; when it is in the engaged state, the first piston 12 is pushed until the outer edge presses the first friction plate group 14, so that the first friction plate 142 and the first counter plate 141 are abutted against each other. At this time, the pressure fluid is introduced into the first pressure chamber through the liquid outlet 45 to apply pressure to the first piston 12, and when the pressure applied to the first piston 12 by the pressure fluid is greater than the first pressure (i.e. the total force required by the first piston 12 to generate displacement), the first piston 12 will move from the separation position (i.e. the initial position) to the combination position (at this time, the outer edge of the first piston 12 contacts with the first friction plate set 14 and presses the first friction plate set 14) against the pre-tightening force of the coil spring 16, the friction force of the sealing material on the first piston 12, and other resistance forces, so that the first friction plate 142 and the first counter plate 141 are pressed against each other to contact each other, and power transmission is realized; when the pressure of the pressure fluid applied to the first piston 12 is smaller than the first pressure, the first piston 12 will return to the separated position under the elastic force of the coil spring 16, and at this time, there is no pressure between the first friction plate 142 and the first counter plate 141 to make them close contact, so as to interrupt the power transmission.

The second clutch mechanism 2 mainly includes a second inner carrier 21, a second piston 22, a second hole retainer ring 23, a second friction plate set 24, a second shaft retainer ring 25, a disc spring 26, a balance piston 27, a second outer carrier 28, a balance cavity 29, and the like. The second inner support 21 is sleeved outside the second hub 35 and supported on the shaft body 41, the second outer support 28 is sleeved outside the connecting support 42 and fixed to the circumferential surface of the connecting support, the second friction plate set 24 is arranged between the second inner support 21 and the second outer support 28 and limited by the retaining ring 23 for the second hole, the second piston 22 is sleeved on the circumferential surface of the shaft body 41, the outer edge of the second piston extends to be matched with the second friction plate set 24, the balance piston 27 is sleeved on the shaft body 41, the balance cavity 29 is surrounded by the second piston 22, the balance piston 27 and the shaft body 41, the belleville spring 26 is arranged in the balance cavity 29, and the inner edge of the second piston 22 is supported by the balance piston 27.

The second friction plate group 24 includes a second friction plate 242 formed on the outer surface of the second inner support 21 and a second dual plate 241 formed on the inner surface of the second outer support 28 and alternately matched with the second friction plate 242, the second piston 22 and the shaft 41 and the connecting support 42 respectively enclose a closed second pressure chamber, and the second pressure chamber is communicated with the corresponding other liquid outlet 45;

the second clutch mechanism 2 has two states of connection and disconnection, and when the second clutch mechanism is in a disconnection state, the outer edge of the second piston 22 is arranged at a distance from the second friction plate set 24; when in the engaged state, the second piston 22 is pushed until the outer edge presses the second friction plate set 24, so that the second friction plate 242 and the second counter plate 241 are abutted. At this time, the pressure fluid is introduced into the second pressure chamber through the other liquid outlet 45 to apply pressure to the second piston 22, and when the pressure fluid applies pressure to the second piston 22 greater than the second pressure (i.e., the sum of the forces required by the second piston 22 to generate displacement), the second piston 22 will move from the separated position (i.e., the initial position) to the combined position (at this time, the second piston 22 contacts the second friction plate set 24 and presses the second friction plate set 24) against the elastic force of the belleville spring 26, the friction force of the second piston 22 (the sealing material), and other resistance forces, so that the second friction plate 242 and the second counter plate 241 are pressed and attached to each other to achieve the transmission of the power; when the pressure applied to the second piston 22 by the pressure fluid is smaller than the second pressure, the second piston 22 will return to the separated position under the elastic force of the belleville spring 26, and at this time, no pressure exists between the second friction plate 242 and the second counter plate 241, so that the power transmission is interrupted.

Further, the six fixing manners of the motor shaft 36 and the first outer bracket 131, the cover plate 32 and the first hub 34, the second inner bracket 21 and the second hub 35, the shaft body 41 and the connecting bracket 42, the first inner bracket 11 and the connecting bracket 42, and the second outer bracket 28 and the connecting bracket 42 are all welded.

Further, a one-way valve 131 is installed on the sealing plate 13 of the first clutch mechanism 1, an "O" ring 132 is installed at a position matched with the shaft body 41, and when the first clutch mechanism 1 is in a separated state, remaining oil in the first pressure chamber communicated with the corresponding liquid outlet 45 can flow out through the one-way valve 131.

Further, the liquid inlet flow passage 46 is respectively communicated with the cooling fluid passage 44 and the cavity where the helical spring 16 is located in the first clutch mechanism 1, the cooling fluid passage 44 and the balance cavity 29 in the second clutch mechanism 2, and the cooling fluid passage 44 and the cavity surrounded by the second inner support 21 and the balance piston 27 in the second clutch mechanism 2.

Further, a through hole is formed in the balance piston 27 in the second clutch mechanism 2 on the inner side of the contact point supporting the disc spring 26 to adjust the balance relationship between the balance chamber 29 and the second pressure chamber.

Further, the high-speed rotation of the power transmission mechanism 4 causes the pressure fluid in the first pressure chamber and the second pressure chamber to generate centrifugal force, and at this time, the first clutch mechanism 1 is further designed to include a sealing plate 13 having a check valve 131 thereon, and when the pressure in the first pressure chamber increases, the check valve 131 is closed; when the pressure in the first pressure chamber decreases to a set value, the check valve 131 opens and the trapped fluid can flow out of the first pressure chamber, thereby reducing the centrifugal force of the trapped fluid at high rotational speeds and avoiding further pressurizing of the first piston 12.

Further, the three liquid inlet flow passages 46 are respectively communicated with the cooling fluid passage 44 and the interior of the first clutch mechanism 1, the cooling fluid passage 44 and the balance cavity 29, and the cooling fluid passage 44 and the interior of the second clutch mechanism 2, so that fluid can be supplied to the balance cavity 29 from the cooling fluid passage 44 and the liquid inlet flow passages 46 to balance the centrifugal force of the liquid retained in the second pressure cavity at a high rotating speed. At this time, the elastic force of the disc spring 26 approaches the initial preload force.

Furthermore, a first communicating hole (not shown) is formed in a position, corresponding to the first friction plate group 14, of the side wall of the first inner bracket 11, a second communicating hole (not shown) is formed in a position, corresponding to the first friction plate group 14, of the side wall of the first outer bracket 31, a third communicating hole (not shown) is formed in a position, corresponding to the second friction plate group 24, of the side wall of the second inner bracket 21, and a fourth communicating hole (not shown) is formed in a position, corresponding to the second friction plate group 24, of the side wall of the second outer bracket 28, so that low-pressure fluid provided by the cooling fluid channel 44 can enter the first clutch mechanism and the second clutch mechanism respectively through the three first liquid inlet oil ducts 46, then pass through the first communicating hole and the third communicating hole to cool the first friction plate group 14 and the second friction plate group 24 respectively, and then return to the transmission case through the second communicating hole and the fourth communicating hole.

In practical application, the power transmission mechanism 4 is connected with an engine, a motor shaft 36 in the power output mechanism 3 is connected with a motor, the first outer bracket 31 in the first clutch mechanism 1 is connected with one group of planetary rows through a first hub 34 fixed with a cover plate 32, and the second inner bracket 21 in the second clutch mechanism 2 is connected with the other group of planetary rows through a second hub 35 fixed with the second hub. When the first friction plate 142 and the first counter plate 141 of the first clutch mechanism 1 are combined, the power of the engine and the power of the motor are superposed and then output to a group of planetary rows; when the second friction plate 242 and the second counter plate 241 of the second clutch mechanism 2 are combined, the power of the engine will be directly output to the other group of planetary rows through the second clutch mechanism 2; when the first clutch mechanism 1 and the second clutch mechanism 2 are not combined, the power of the engine is not output, and a pure electric working condition is formed; when the first clutch mechanism 1 and the second clutch mechanism 2 are simultaneously engaged, a direct gear operating condition is formed. In practical application, the vehicle can be started in a pure electric mode, after the vehicle speed reaches 20 km/h to 40 km/h (specifically determined according to an actual control strategy), the engine is dragged from zero rotating speed to ignition rotating speed by the combination of the first clutch mechanism 1 or the combination of the second clutch mechanism 2 and the motor or the planet row, and then ignition is carried out, so that the purpose of reducing the oil consumption is achieved.

Therefore, the double clutch for the hybrid transmission allows multiple power combination forms of four working conditions, namely, the first clutch mechanism 1 is singly combined, the second clutch mechanism 2 is singly combined, two clutch mechanisms are simultaneously combined and two clutch mechanisms are simultaneously separated by adjusting the fluid pressure flowing to the first clutch mechanism 1 and the second clutch mechanism 2; the clutch mechanism has the advantages that the radial space is fully utilized, the structure is simple, the installation is convenient, the maximum utilization rate of parts is realized on the premise of not increasing the difficulty of the manufacturing process, the parts in the traditional design are reduced, the cost is reduced, and meanwhile, the axial length of the clutch mechanism is also shortened.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. An axial dual clutch structure for a hybrid transmission, comprising:

the power transmission mechanism (4) comprises a shaft body (41), a connecting support (42) which is sleeved outside the shaft body (41) and is fixed with the peripheral surface of the shaft body, a pressure fluid channel (43) which is circumferentially arranged in the shaft body (41), a cooling fluid channel (44) which is arranged in the shaft body (41), a liquid outlet (45) which is arranged in the shaft body (41) and is communicated with the pressure fluid channel (43), and a liquid inlet flow channel (46) which is arranged in the shaft body (41) and is communicated with the cooling fluid channel (44);

the power output mechanism (3) comprises a first outer support (31), a cover plate (32), a first hole retainer ring (33), a first hub (34), a second hub (35) and a motor shaft (36), wherein the first outer support (31) is fixed with the motor shaft (36), the cover plate (32) is in tooth-shaped meshing with the first outer support (31) and axially limited through the first hole retainer ring (33), the peripheral surface of the first hub (34) is fixed with the cover plate (32) and connected with an output shaft through an internal spline, and the second hub (35) is connected with another output shaft through an internal spline;

the second clutch mechanism (2) is arranged on one side of the connecting support (42) and comprises a second inner support (21), a second piston (22), a second hole retainer ring (23), a second friction plate group (24), a second shaft retainer ring (25), a disc spring (26), a balance piston (27), a second outer support (28) and a balance cavity (29), the second inner support (21) is sleeved outside the second hub (35) and supported on the shaft body (41), the second outer support (28) is sleeved outside the connecting support (42) and fixed with the peripheral surface of the connecting support, the second friction plate group (24) is arranged between the second inner support (21) and the second outer support (28) and limited through the second hole retainer ring (23), the second piston (22) is sleeved on the peripheral surface of the shaft body (41) and the outer edge of the second piston extends to be matched with the second friction plate group (24), the balance piston (27) is sleeved on the shaft body (41), the balance cavity (29) is surrounded by the second piston (22), the balance piston (27) and the shaft body (41), the belleville spring (26) is arranged in the balance cavity (29), and the inner edge of the second piston (22) is supported by the balance piston (27);

the second friction plate group (24) comprises a second friction plate (242) formed on the outer surface of the second inner support (21) and a second dual plate (241) formed on the inner surface of the second outer support (28) and alternately matched with the second friction plate (242), the second piston (22) and the shaft body (41) and the connecting support (42) respectively enclose a closed second pressure cavity, and the second pressure cavity is communicated with the other corresponding liquid outlet (45);

the second clutch mechanism (2) has two states of connection and disconnection, when the second clutch mechanism is in a disconnection state, the outer edge of the second piston (22) and the second friction plate set (24) are arranged at intervals, when the second clutch mechanism is in a connection state, the outer edge of the second piston (22) presses the second friction plate set (24), and under the limiting action of a second hole retainer ring (23), the second friction plate (242) and the second counter plate (241) are tightly attached;

the clutch mechanism comprises a connecting support (42) and a first clutch mechanism (1) arranged on the other side of the connecting support (42), wherein the first clutch mechanism (1) comprises a first inner support (11), a first piston (12), a sealing plate (13), a first friction plate set (14), a first shaft snap ring (15) and a spiral spring (16), the first inner support (11) is sleeved outside the connecting support (42) and is fixed with the peripheral surface of the connecting support, the first friction plate set (14) is arranged between the first inner support (11) and the first outer support (31), the first piston (12) is sleeved on the peripheral surface of the shaft body (41) and the outer edge of the first piston extends to the first friction plate set (14) to be matched, the sealing plate (13) is sleeved outside the first piston (12) and is limited through the first shaft snap ring (15), the spiral spring (16) is arranged between the first piston (12) and the shaft body (41), the first friction plate group (14) comprises a first friction plate (142) sleeved on the outer surface of the first inner support (11) and a first pair of coupling plates (141) formed on the inner surface of the first outer support (31) and alternately matched with the first friction plate (142), the first piston (12) and the sealing plate (13) are sleeved on the shaft body (41) and form a first pressure cavity, and the first pressure cavity is communicated with one corresponding liquid outlet (45);

the first clutch mechanism (1) has a combined state and a separated state, and when the first clutch mechanism is in the separated state, the outer edge of the first piston (12) is arranged at a distance from the first friction plate set (14); when the first friction plate and the second friction plate are in a combined state, the outer edge of the first piston (12) presses the first friction plate group (14), and the first friction plate (142) and the first counter plate (141) are tightly combined under the supporting action of the cover plate (32).

2. An axial dual clutch structure for a hybrid transmission as defined in claim 1, wherein: the motor shaft (36) and the first outer support (31), the cover plate (32) and the first hub (34), the second inner support (21) and the second hub (35), the shaft body (41) and the connecting support (42), the first inner support (11) and the connecting support (42), and the second outer support (28) and the connecting support (42) are fixed in a welding mode.

3. An axial dual clutch structure for a hybrid transmission as defined in claim 1, wherein: and when the first clutch mechanism (1) is in a separated state, retained oil in the first pressure cavity communicated with the corresponding liquid outlet (45) can flow out through the one-way valve (131).

4. An axial dual clutch structure for a hybrid transmission as defined in claim 1, wherein: the liquid inlet flow channel (46) is respectively communicated with a cavity where the cooling fluid channel (44) and the spiral spring (16) in the first clutch mechanism (1) are located, the cooling fluid channel (44) and a balance cavity (29) in the second clutch mechanism (2), and a cavity surrounded by a second inner support (21) and a balance piston (27) in the cooling fluid channel (44) and the second clutch mechanism (2).

5. An axial dual clutch structure for a hybrid transmission as defined in claim 1, wherein: a through hole is formed in a balance piston (27) in the second clutch mechanism (2) on the inner side of a contact point supporting the disc spring (26) to adjust the balance relation between the balance cavity (29) and the second pressure cavity.

6. An axial dual clutch structure for a hybrid transmission as defined in claim 1, wherein: a first communicating hole is formed in the position, corresponding to the first friction plate group (14), of the first inner support (11), a second communicating hole is formed in the position, corresponding to the first friction plate group (14), of the first outer support (31), a third communicating hole is formed in the position, corresponding to the second friction plate group (24), of the second inner support (21), and a fourth communicating hole is formed in the position, corresponding to the second friction plate group (24), of the second outer support (28).