CN111237358A

CN111237358A - Buffer clutch and gearbox

Info

Publication number: CN111237358A
Application number: CN202010180942.8A
Authority: CN
Inventors: 刘国庆; 迟峰; 卞维展; 崔纪军
Original assignee: Shandong Lingong Construction Machinery Co Ltd
Current assignee: Shandong Lingong Construction Machinery Co Ltd
Priority date: 2020-03-16
Filing date: 2020-03-16
Publication date: 2020-06-05

Abstract

The invention belongs to the technical field of power transmission and discloses a buffer clutch and a gearbox. The damper clutch includes: the clutch comprises a clutch shaft, and a buffer piston, a main piston, a hub, a gear assembly and a friction plate assembly which are all sleeved on the clutch shaft, wherein the clutch shaft, the buffer piston and the hub are fixedly arranged, and a main oil duct and a buffer oil duct which are not communicated with each other are respectively arranged in the clutch shaft; the buffer pressure oil in the buffer oil duct can enter between the main piston and the buffer piston and can push one side of the main piston, and the main pressure oil in the main oil duct can push the other side of the main piston to move in the direction close to the friction plate assembly and abut against the friction plate assembly, so that the gear assembly is selectively connected with the hub through the friction plate assembly. The clutch oil of the buffer clutch presses the main piston stably and quickly, the impact force when the clutch is combined is reduced, the hydraulic load force provided by the buffer pressure oil enables the main piston to return quickly, and the clutch is separated quickly and thoroughly.

Description

Buffer clutch and gearbox

Technical Field

The invention relates to the technical field of power transmission, in particular to a buffer clutch and a gearbox.

Background

At present, most of gear boxes of loaders adopt a plane clutch, and a few of gear boxes adopt a step clutch.

As shown in fig. 1, the flat clutch is a clutch using a flat piston and a flat cylinder, and the flat clutch includes a clutch shaft 100, a piston 101, a spacer 102, a seal ring 103, a friction plate 104, a spring 105, a clutch hub 106, an oil chamber 107, and a gear assembly 108. When the planar clutch is combined, pressure oil directly enters the clutch oil cylinder and directly acts on the whole working surface of the piston 101, the stress of the piston 101 is rapidly increased, the return spring force of the spring 105 is overcome, the friction plate 104 is pressed tightly, great impact force is generated, the gear shifting comfort is poor, and the reliability of a transmission system is influenced.

As shown in fig. 2, the stepped clutch is a clutch using a stepped piston and a stepped cylinder, and includes a clutch shaft 200, a piston 201, an inner seal ring 202, an outer seal ring 203, a spacer 204, a buffer orifice 205, a friction plate 206, a spring 207, a clutch hub 208, a gear assembly 209, an outer oil chamber 210 and an inner oil chamber 211, when the stepped clutch is combined, pressure oil sequentially enters the inner oil chamber 211 and the outer oil chamber 210 between the piston 201 and the cylinder, the buffer orifice 205 is provided between the inner oil chamber 211 and the outer oil chamber 210, and an impact force when the clutch is combined is reduced by prolonging oil-charging and pressure-increasing time. The practical application effect is not good, and the problems that the buffer throttle hole 205 is too small, the oil filling time is long, and the like are presented, and if the buffer throttle hole 205 is too large, the oil filling time is short, so that the gear shifting impact is large.

Disclosure of Invention

The invention aims to provide a buffer clutch and a gearbox, so that the clutch is stably combined, the gear shifting impact is reduced, the separation is quick, and the problem of gear interference caused by slow oil return during gear switching is solved.

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

a damper clutch, comprising: the clutch comprises a clutch shaft, and a buffer piston, a main piston, a hub, a gear assembly and a friction plate assembly which are all sleeved on the clutch shaft, wherein the clutch shaft is respectively fixedly arranged with the buffer piston and the hub, the gear assembly can rotate relative to the clutch shaft, and a main oil duct and a buffer oil duct which are not communicated with each other are respectively arranged in the clutch shaft;

the buffering oil passage is characterized in that buffering pressure oil in the buffering oil passage can enter between the main piston and the buffering piston and can push one side of the main piston, and the main pressure oil in the main oil passage can push the other side of the main piston to move in the direction close to the friction plate assembly and abut against the friction plate assembly, so that the gear assembly is selectively connected with the hub through the friction plate assembly.

Preferably, the buffer piston and the main piston are in sealing sliding fit to form a buffer oil cavity, and the buffer oil cavity is communicated with the buffer oil channel.

Preferably, a buffer oil hole is formed in the main piston, and the buffer oil hole is respectively communicated with the buffer oil passage and the buffer oil cavity.

Preferably, the oil cylinder further comprises a separation frame, the separation frame is sleeved on the clutch shaft, the main piston and the separation frame are in sealing sliding fit to form a main oil cavity, and the main oil cavity is communicated with the main oil gallery.

Preferably, the main piston includes:

a main body sleeved on the clutch shaft;

a primary seal layer disposed on a side of the primary base body adjacent the spacer and between the clutch shaft and the spacer.

Preferably, the damping piston includes:

the buffer base body is sleeved on the clutch shaft;

and a buffer sealing layer which is arranged outside the buffer base body and is abutted against the main piston.

Preferably, the clutch device further comprises a resetting piece, the resetting piece is sleeved on the clutch shaft, and the resetting piece is located between the buffer piston and the main piston and can be abutted against the buffer piston and the main piston respectively.

Preferably, the friction plate assembly comprises:

the driving friction plate is sleeved on the hub and positioned between the hub and the gear assembly, and the driving friction plate can be abutted against the main piston;

and the driven friction plate is arranged opposite to the driving friction plate and connected with the gear assembly, and the driven friction plate can be selectively abutted against the driving friction plate.

Preferably, the clutch further includes a first retaining ring, and the hub is attached to the clutch shaft via the first retaining ring.

In order to achieve the purpose, the invention further provides a gearbox which comprises the buffer clutch.

The invention has the beneficial effects that:

when the buffering clutch provided by the invention is combined, main pressure oil flowing out of the main oil duct pushes the main piston to move towards the direction close to the friction plate assembly and abut against the friction plate assembly, meanwhile, the buffering pressure oil flowing out of the buffering oil duct enters the space between the main piston and the buffering piston and generates hydraulic load force on the main piston, so that the main pressure oil overcomes the hydraulic load force and pushes the main piston to press the friction plate assembly tightly, and transmission power is transmitted through the clutch shaft, the hub, the friction plate assembly and the gear assembly and is finally output by the gear assembly.

When the clutch is separated, main pressure oil flowing to the main piston from the main oil duct is cut off, the main piston rapidly returns under the action of hydraulic load pressure generated by the buffer pressure oil on the main piston, the main piston is separated from the friction plate assembly, the gear assembly is separated from the hub through the friction plate assembly, power transmission is cut off, and rapid separation of the clutch is achieved.

Compared with the prior art, the buffer pressure oil is introduced between the main piston and the buffer piston to generate hydraulic load force on the main piston, when the clutch is combined, the thrust exerted by the main pressure oil on the main piston needs to overcome the hydraulic load force, the clutch oil is pressed flat and stably and quickly pushes the main piston, the impact force when the clutch is combined is reduced, the stability of power transmission is improved, and the problems that each element of a transmission system is subjected to large impact load and equal gear are solved; when the clutch is separated, the hydraulic load force provided by the buffer pressure oil enables the main piston to return quickly, the clutch is separated quickly and thoroughly, interference of gears is avoided, the hydraulic load force generated by the buffer pressure oil can ensure that the main piston returns in time, and the problems that the clutch is worn for a long time to cause high temperature and friction plate sintering and the like are avoided.

The invention also provides a gearbox which comprises the buffer clutch, the gear shifting is stable and quick, the gear shifting comfort is good, and the reliability of a transmission system is ensured.

Drawings

FIG. 1 is a schematic illustration of a prior art planar clutch construction;

FIG. 2 is a schematic structural view of a prior art stepped clutch;

FIG. 3 is a schematic structural view of the damper clutch of the present invention;

FIG. 4 is a schematic illustration of the primary piston of the damper clutch of the present invention;

FIG. 5 is a schematic diagram of a damper piston of the damper clutch of the present invention.

In the figure:

100. a clutch shaft; 101. a piston; 102. an isolation frame; 103. a seal ring; 104. a friction plate; 105. a spring; 106. a clutch hub; 107. an oil chamber; 108. a gear assembly;

200. a clutch shaft; 201. a piston; 202. an inner seal ring; 203. an outer seal ring; 204. an isolation frame; 205. a buffer orifice; 206. a friction plate; 207. a spring; 208. a clutch hub; 209. a gear assembly; 210. an outer oil chamber; 211. an inner oil chamber;

1. a clutch shaft; 2. a cushion piston; 3. a primary piston; 4. a hub; 5. a gear assembly; 6. a friction plate assembly; 7. a buffer oil cavity; 8. an isolation frame; 9. a main oil chamber; 10. a reset member;

11. a main oil gallery; 12. a buffer oil passage; 13. a first retainer ring; 14. a second retainer ring; 15. a first bearing; 16. a second bearing; 17. a third retainer ring;

21. a buffer substrate; 22. buffering the sealing layer;

211. a first buffer section; 212. a second buffer section; 213. a third buffer section; 214. a fourth buffer section;

31. a main body; 32. a primary seal layer;

311. a first main connection portion; 312. a second main connecting portion; 313. a third main connection portion; 314. a fourth main connection portion; 315. a sliding part; 316. an abutting portion; 3151. a buffer oil hole;

61. an active friction plate; 62. a driven friction plate; 63. a baffle bracket.

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 and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. 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 invention is further explained by the specific implementation mode in combination with the attached drawings.

The embodiment provides a buffer clutch which is suitable for a gearbox of a loader and a grader. As shown in fig. 3, the cushion clutch includes a clutch shaft 1, a cushion piston 2, a main piston 3, a hub 4, a gear assembly 5, and a friction plate assembly 6, wherein the cushion piston 2, the main piston 3, the hub 4, the gear assembly 5, and the friction plate assembly 6 are respectively inserted into the clutch shaft 1, and the clutch shaft 1 performs a transmission function. The clutch shaft 1 is respectively fixed with the buffer piston 2 and the hub 4, the gear assembly 5 can rotate relative to the clutch shaft 1, a main oil duct 11 and a buffer oil duct 12 are respectively arranged in the clutch shaft 1, the main oil duct 11 and the buffer oil duct 12 are not communicated with each other, an inlet of the main oil duct 11 is used for introducing main pressure oil, and an inlet of the buffer oil duct 12 is used for introducing buffer pressure oil. The buffer pressure oil in the buffer oil duct 12 can enter between the main piston 3 and the buffer piston 2 and can push one side of the main piston 3, and the main pressure oil in the main oil duct 11 can push the other side of the main piston 3 to move towards the direction close to the friction plate assembly 6 along the axial direction of the clutch shaft 1 and abut against the friction plate assembly 6, so that the gear assembly 5 is selectively connected with the hub 4 through the friction plate assembly 6, and the process of combining the clutch is completed.

In the buffer clutch provided by the embodiment, when the buffer clutch is combined, the main pressure oil flowing out of the main oil gallery 11 pushes the main piston 3 to move towards the direction close to the friction plate assembly 6 and abut against the friction plate assembly 6, meanwhile, the buffer pressure oil flowing out of the buffer oil gallery 12 enters between the main piston 3 and the buffer piston 2 and generates hydraulic load force on the main piston 3, so that the main pressure oil overcomes the hydraulic load force and pushes the main piston 3 to press the friction plate assembly 6, and transmission power is transmitted through the clutch shaft 1, the hub 4, the friction plate assembly 6 and the gear assembly 5 and finally output by the gear assembly 5.

When the clutch is separated, main pressure oil flowing to the main piston 3 in the main oil passage 11 is cut off, the main piston 3 rapidly returns under the action of hydraulic load pressure generated by the buffer pressure oil on the main piston 3, the main piston 3 is separated from the friction plate assembly 6, the gear assembly 5 is separated from the hub 4 through the friction plate assembly 6, power transmission is cut off, and rapid separation of the clutch is achieved.

Compared with the prior art, the buffer pressure oil is introduced between the main piston 3 and the buffer piston 2 to generate hydraulic load force on the main piston 3, when the clutch is combined, the thrust exerted by the main pressure oil on the main piston 3 needs to overcome the hydraulic load force, the clutch oil is pressed flat and stably and quickly pushes the main piston 3, the impact force when the clutch is combined is reduced, the stability of power transmission is improved, and the problems that each element of a transmission system is subjected to large impact load and gear waiting are solved; when the clutch is separated, the hydraulic load force provided by the buffer pressure oil enables the main piston 3 to return quickly, the clutch is separated quickly and thoroughly, interference of gears is avoided, the hydraulic load force generated by the buffer pressure oil can ensure that the main piston 3 returns in time, and the problems that the clutch is worn for a long time to cause high temperature and friction plate sintering are avoided.

Further, as shown in fig. 3, the clutch shaft 1 is used as a power transmission shaft, a first axial hole is formed from the shaft end of the clutch shaft 1 along the axial direction thereof, a first radial hole is formed in the clutch shaft 1 along the radial direction thereof, and the first radial hole and the first axial hole are communicated with each other to form a main oil gallery 11, so that main pressure oil flows into the first radial hole from the first axial hole. Meanwhile, a second axial hole is formed in the shaft end of the clutch shaft 1 on the same side along the axial direction, the axis of the second axial hole is parallel to the axis of the first axial hole, namely the first axial hole and the second axial hole are not communicated with each other and are respectively independent oil passages. And a second radial hole is formed in the clutch shaft 1 along the radial direction of the clutch shaft, and the second radial hole and the second axial hole are communicated with each other to form a buffer oil passage 12, so that buffer pressure oil flows into the second radial hole from the second axial hole.

In order to realize that the main pressure oil flowing out from the main oil gallery 11 can push the main piston 3 to move towards the direction close to the friction plate assembly 6 along the axial direction of the clutch shaft 1, as shown in fig. 3, the buffer clutch further comprises an isolation frame 8, wherein the isolation frame 8 is in an annular structure, and the isolation frame 8 is sleeved on the clutch shaft 1. Specifically, the isolation frame 8 and the clutch shaft 1 are in interference fit. The main piston 3 and the isolation frame 8 are in sealing sliding fit to form a main oil cavity 9, the main oil cavity 9 is communicated with a first radial hole of the main oil gallery 11, and main pressure oil flowing out of the first radial hole of the main oil gallery 11 enters the main oil cavity 9 to push the main piston 3 to move towards the direction close to the friction plate assembly 6.

Further, as shown in fig. 3 to 4, the main piston 3 includes a main body 31 and a main seal layer 32 connected to each other, the main body 31 is made of metal, the main body 31 is fitted over the clutch shaft 1, and the main body 31 is disposed around the spacer 8. One side of the main base body 31 close to the isolation frame 8 is provided with a main sealing layer 32, and the main sealing layer 32 is located between the clutch shaft 1 and the isolation frame 8, so that a sealing effect is achieved, and the main oil cavity 9 is a cavity with a sealing structure.

Specifically, the main base 31 includes a first main connecting portion 311, a second main connecting portion 312, a third main connecting portion 313, a fourth main connecting portion 314, a sliding portion 315, and an abutting portion 316 that are connected to each other, the sliding portion 315 is attached to and slidably engaged with an outer wall of the clutch shaft 1, the sliding portion 315 is connected to the first main connecting portion 311, the first main connecting portion 311 and the third main connecting portion 313 are both disposed obliquely to an axial direction of the clutch shaft 1, the second main connecting portion 312 is disposed between the first main connecting portion 311 and the third main connecting portion 313, the second main connecting portion 312 is disposed in an axial direction perpendicular to the clutch shaft 1, the third main connecting portion 313 is connected to the fourth main connecting portion 314, the fourth main connecting portion 314 is disposed parallel to the axial direction of the clutch shaft 1, so that the main oil chamber 9 is formed among the first main connecting portion 311, the second main connecting portion 312, the third main connecting portion 313, the fourth main connecting portion 314, the clutch shaft 1, and the spacer 8. An abutting portion 316 is formed at one end of the fourth main connecting portion 314 not connected to the third main connecting portion 313 so as to extend outward in the radial direction of the clutch shaft 1, and the abutting portion 316 is provided in parallel with the friction plate assembly 6 so as to facilitate the abutting of the abutting portion 316 and the friction plate assembly 6.

It can be understood that the abutting portion 316 mainly functions to contact and abut against the friction plate assembly 6, so that the main seal layer 32 only needs to be coated on the sliding fit surfaces of the main base 31, such as the first main connection portion 311, the second main connection portion 312, the third main connection portion 313, the fourth main connection portion 314, and the abutting portion 316 does not need to be coated with a seal layer, thereby saving production cost.

As shown in fig. 3, in order to realize that the buffer pressure oil flowing out of the buffer oil passage 12 can push the main piston 3 to move in the direction away from the friction plate assembly 6 along the axial direction of the clutch shaft 1, the buffer piston 2 and the main piston 3 are in sealed sliding fit to form a buffer oil chamber 7, the buffer oil chamber 7 is communicated with the buffer oil passage 12, and the buffer pressure oil flowing out of the second radial hole of the buffer oil passage 12 enters the buffer oil chamber 7 to push the main piston 3 to move in the direction away from the friction plate assembly 6.

Since the outlet of the buffer oil passage 12 is disposed on the circumferential surface of the clutch shaft 1, and the buffer oil chamber 7 is located between the main piston 3 and the buffer piston 2, in order to facilitate the communication between the buffer oil passage 12 and the buffer oil chamber 7, a buffer oil hole 3151 (as shown in fig. 3) is disposed on the sliding portion 315 of the main piston 3, the buffer oil hole 3151 is disposed on the portion of the main piston 3 contacting the clutch and is disposed along the radial direction of the clutch shaft 1, the buffer oil hole 3151 is respectively communicated with the buffer oil passage 12 and the buffer oil chamber 7, and the buffer oil hole 3151 plays a role of intermediate communication, so that the buffer pressure oil flowing out from the buffer oil passage 12 enters the buffer oil chamber 7 through the buffer oil hole 3151 to provide a hydraulic loading force and a resetting driving force for the main piston 3.

Further, as shown in fig. 3 and 5, the damper piston 2 includes a damper base 21 and a damper seal layer 22, the damper base 21 is fitted over the clutch shaft 1, the damper seal layer 22 is provided on the outer side of the damper base 21, and the damper seal layer 22 abuts against the main piston 3 for sealing a gap between the main piston 3 and the damper base 21.

Specifically, the damper base 21 includes a first damper portion 211, a second damper portion 212, a third damper portion 213, and a fourth damper portion 214 that are connected in sequence, the first damper portion 211, the third damper portion 213, and the fourth damper portion 214 are all disposed perpendicular to the axial direction of the clutch shaft 1, and the second damper portion 212 is disposed between the first damper portion 211 and the third damper portion 213 and disposed parallel to the axial direction of the clutch shaft 1. The first buffer part 211 and the second buffer part 212 extend into the hub 4 by adopting a bending structure, one end of the fourth buffer part 214, which is not connected to the third buffer part 213, is provided with a buffer sealing layer 22, and the end part of the end is wrapped by the buffer sealing layer 22, so that a buffer oil cavity 7 with a sealing structure is formed between the main piston 3 and the buffer piston 2.

In order to further improve the smoothness of the clutch during the engagement process and the sensitivity of the clutch during the disengagement process, as shown in fig. 3, the damper clutch further includes a reset member 10, the reset member 10 may be a spring, the reset member 10 is sleeved on the clutch shaft 1, and the reset member 10 is located between the damper piston 2 and the main piston 3 and can be abutted against the damper piston 2 and the main piston 3, respectively. Specifically, the restoring member 10 is disposed in a space surrounded by the first main connecting portion 311, the second main connecting portion 312, the sliding portion 315 of the main piston 3, the clutch shaft 1, and the first buffer portion 211 and the second buffer portion 212 of the buffer piston 2.

When the clutch is combined, main pressure oil entering the main oil cavity 9 pushes the main piston 3 to move towards the direction close to the friction plate assembly 6, the inner side of the main piston 3 is abutted against the reset piece 10, then the reset piece 10 is gradually compressed in the continuous moving process, and at the moment, the main piston 3 needs to simultaneously overcome the hydraulic load force of the buffer pressure oil on the main piston 3 and the acting force of the spring, so that the stability of the moving process of the main piston 3 towards the direction close to the friction plate assembly 6 is enhanced, and the impact of gear shifting is greatly reduced; when the clutch is separated, under the hydraulic load pressure generated by the buffer pressure oil on the main piston 3 and the restoring acting force of the restoring piece 10, the main piston 3 can be quickly restored, power transmission is cut off, the clutch is quickly separated, the problem of interference of gears during gear switching is avoided, and the reliability of a transmission system is obviously improved.

Because the hub 4 is sleeved on the clutch shaft 1, in order to ensure the connection stability between the hub 4 and the clutch shaft, the buffer clutch further comprises a first retaining ring 13, the first retaining ring 13 is sleeved on the clutch shaft 1, the hub 4 is installed on the clutch shaft 1 through the first retaining ring 13, and the first retaining ring 13 plays a role in fixing and installing. Optionally, the buffer clutch further includes a second retainer ring 14, the second retainer ring 14 is sleeved on the clutch shaft 1, two sides of the second retainer ring 14 abut against the buffer piston 2 and the hub 4, respectively, and the second retainer ring 14 plays a role in axial limiting.

Wherein, the holding tank has been seted up along its axial direction in one side that wheel hub 4 is close to buffer piston 2, and the holding tank has played the effect that the part held buffer piston 2, provides certain accommodation space for buffer piston 2 dodges.

In order to realize the selective connection between the hub 4 and the gear assembly 5, a friction plate component 6 is arranged between the hub 4 and the gear assembly 5, the friction plate component 6 comprises a driving friction plate 61 and a driven friction plate 62, the driving friction plate 61 is sleeved on the hub 4, the driving friction plate 61 is positioned between the hub 4 and the gear assembly 5 and connected to the hub 4, the driven friction plate 62 is arranged opposite to the driving friction plate 61 and connected to the gear assembly 5, the driving friction plate 61 can be abutted against the driving piston 3, so that the driven friction plate 62 can be selectively abutted against the driving friction plate 61, and the power transmission and the cut-off between the hub 4 and the gear assembly 5 are realized.

The number of the driving friction plates 61 and the number of the driven friction plates 62 are multiple, and one driven friction plate 62 is arranged between every two adjacent driving friction plates 61, so that the driving friction plates 61 and the driven friction plates 62 are arranged in a staggered mode, and the power transmission effect between the hub 4 and the gear assembly 5 is increased.

Because the driven friction plate 62 located in the middle is clamped between two adjacent driving friction plates 61, and the driven friction plate 62 farthest away from the driving piston 3 may be suspended to affect the power transmission effect, in order to solve the problem, the friction plate assembly 6 further comprises a baffle plate support 63, the baffle plate support 63 is installed on the hub 4 and located on one side far away from the driving piston 3, so that two sides of the driven friction plate 62 farthest away from the driving piston 3 can be abutted to one driving friction plate 61 and the baffle plate support 63 respectively, the baffle plate support 63 plays a role in resisting, the suspended situation of the driven friction plate 62 is avoided, each driving friction plate 61 and each driven friction plate 62 can be stressed to resist, and the stability of power combination is ensured.

Further, in order to realize the power transmission of the gear assembly 5, as shown in fig. 3, the buffer clutch further includes a first bearing 15, a second bearing 16 and a third retainer 17 all sleeved on the clutch shaft 1, the first bearing 15 is specifically a needle bearing, and the first bearing 15 is sleeved on the clutch shaft 1 and is located between the clutch shaft 1 and the gear assembly 5, so as to ensure the smoothness of the gear rotation. The second bearings 16 are thrust bearings, the number of the second bearings 16 is two, the two second bearings 16 are respectively arranged on two sides of the gear assembly 5, one second bearing 16 is located between the first retainer ring 13 and the gear assembly 5, the other second bearing 16 is located between the gear assembly 5 and the third retainer ring 17, and the third retainer ring 17 plays a limiting role. By the first bearing 15, the second bearing 16, and the third retainer 17 being engaged with each other, the gear assembly 5 is stably supported on the clutch shaft 1 by the first bearing 15, the second bearing 16, and the third retainer 17.

It should be particularly noted that the number of the main piston 3, the buffer piston 2, the friction plate assembly 6, the hub 4, the reset member 10 and the gear assembly 5 is two, and the two parts are respectively and symmetrically arranged on two sides of the isolation frame 8, and the gear shifting requirements of different gears are met through the symmetrical arrangement. It is understood that the portion of the main oil gallery 11 that is broken is not shown in the present cross section, but is a blocked portion. As shown in fig. 3, the number of the main oil galleries 11 is two, the two main oil galleries 11 are independent of each other, and each main oil gallery 11 is communicated with one main oil chamber 9 and used for controlling the combination and the separation of the hub 4 and the gear assembly 5 which are positioned on the same side of the isolation frame 8. For example: main pressure oil introduced into the main oil gallery 11 shown by a solid line is used for pushing the main piston 3 positioned on the right side of the isolation frame 8 to realize 1 gear; main pressure oil introduced into a main oil gallery 11 indicated by a dotted line is used for pushing a main piston 3 positioned on the left side of an isolation frame 8 to realize the 2-gear.

The working process of the buffer clutch provided by the embodiment is as follows:

when in combination, the pressure of the main pressure oil is about 1.2 MPa-2.3 MPa, and the main pressure oil enters the main oil cavity 9 through the main oil duct 11 to push the main piston 3 to move towards the direction close to the friction plate assembly 6; the pressure of the buffer pressure oil is about 0.1-0.5 MPa, the buffer pressure oil sequentially passes through the buffer oil duct 12 and the buffer oil hole 3151, enters the buffer oil cavity 7 between the main piston 3 and the buffer piston 2, hydraulic load force is generated on the main piston 3, the main pressure oil stably and quickly pushes the main piston 3 to compress the driving friction plate 61, the driving friction plate 61 and the driven friction plate 62 are abutted against each other, and power is transmitted through the clutch shaft 1, the hub 4, the friction plate assembly 6 and the gear assembly 5 and finally output by the gear assembly 5.

When the main oil duct 11 is cut off from the main pressure oil flowing to the main piston 3, the main piston 3 is rapidly returned under the hydraulic load force generated by the buffer pressure oil on the main piston 3 and the reset action of the reset piece 10, the power transmission is cut off, the clutch is rapidly separated, when the reset piece 10 is broken or the spring force of the reset piece 10 is attenuated, the hydraulic load force generated by the buffer pressure oil can ensure that the main piston 3 is timely returned, and the problems that the buffer clutch is subjected to high temperature due to long-time sliding wear, the friction plate assembly 6 is sintered and the like are solved.

This embodiment still provides a gearbox, including above-mentioned buffer clutch, it is steady and quick to shift, and the travelling comfort of shifting is good, guarantees transmission system's reliability.

In the description herein, it is to be understood that the terms "upper", "lower", "right", and the like are based on the orientations and positional relationships shown in the drawings and are used for convenience in description and simplicity in operation, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be constructed in a particular operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In addition, the foregoing is only the preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A damper clutch, comprising: the clutch comprises a clutch shaft (1), and a buffer piston (2), a main piston (3), a hub (4), a gear assembly (5) and a friction plate assembly (6) which are all sleeved on the clutch shaft (1), wherein the clutch shaft (1) is respectively fixedly arranged with the buffer piston (2) and the hub (4), the gear assembly (5) can rotate relative to the clutch shaft (1), and a main oil duct (11) and a buffer oil duct (12) which are not communicated with each other are respectively arranged in the clutch shaft (1);

buffer pressure oil in the buffer oil duct (12) can enter between the main piston (3) and the buffer piston (2) and can push one side of the main piston (3), and main pressure oil in the main oil duct (11) can push the other side of the main piston (3) to move in the direction close to the friction plate assembly (6) and abut against the friction plate assembly (6), so that the gear assembly (5) is selectively connected with the hub (4) through the friction plate assembly (6).

2. The damper clutch according to claim 1, characterized in that the damper piston (2) and the main piston (3) are in sealed sliding fit to form a damper oil chamber (7), and the damper oil chamber (7) is communicated with the damper oil passage (12).

3. The cushion clutch according to claim 2, wherein a cushion oil hole (3151) is formed in the main piston (3), and the cushion oil hole (3151) is communicated with the cushion oil passage (12) and the cushion oil chamber (7), respectively.

4. The buffer clutch as claimed in claim 1, further comprising a spacer (8), wherein the spacer (8) is sleeved on the clutch shaft (1), the main piston (3) and the spacer (8) are in sealing sliding fit to form a main oil chamber (9), and the main oil chamber (9) is communicated with the main oil gallery (11).

5. The damper clutch according to claim 4, characterized in that the main piston (3) comprises:

a main body (31) that is fitted around the clutch shaft (1);

a primary seal layer (32) provided on a side of the primary base body (31) close to the spacer (8) and between the clutch shaft (1) and the spacer (8).

6. The damper clutch according to claim 2, characterized in that the damper piston (2) comprises:

a buffer base body (21) sleeved on the clutch shaft (1);

and a cushion seal layer (22) that is provided outside the cushion base body (21) and that is in contact with the main piston (3).

7. The damper clutch according to claim 1, characterized by further comprising a reset member (10), wherein the reset member (10) is sleeved on the clutch shaft (1), and the reset member (10) is located between the damper piston (2) and the main piston (3) and can be abutted against the damper piston and the main piston respectively.

8. The damper clutch according to claim 1, characterized in that the friction plate assembly (6) comprises:

the driving friction plate (61) is sleeved on the hub (4) and positioned between the hub (4) and the gear assembly (5), and the driving friction plate (61) can abut against the main piston (3);

and a driven friction plate (62) which is arranged opposite to the driving friction plate (61) and is connected to the gear assembly (5), wherein the driven friction plate (62) can be selectively abutted against the driving friction plate (61).

9. The damper clutch according to claim 1, characterized by further comprising a first retainer ring (13), the hub (4) being mounted on the clutch shaft (1) by means of the first retainer ring (13).

10. A gearbox comprising a damper clutch according to any one of claims 1 to 9.