CN111237358A - A buffer clutch and gearbox - Google Patents

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

A 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 technique

At present, most of the loader gearboxes use flat clutches, and a few use stepped clutches.

As shown in FIG. 1 , the plane clutch is a clutch using a plane piston and a plane oil cylinder. The plane clutch includes a clutch shaft 100 , a piston 101 , a spacer 102 , a sealing ring 103 , a friction plate 104 , a spring 105 , and a clutch hub 106 , oil cavity 107 and gear assembly 108 . When the plane clutch is combined, the pressure oil directly enters the clutch cylinder and acts directly on the entire working surface of the piston 101. The force of the piston 101 increases rapidly and overcomes the return spring force of the spring 105 and compresses the friction plate 104. Impact force, poor shifting comfort, and affect the reliability of the transmission system.

As shown in FIG. 2, the stepped clutch is a clutch using stepped pistons and stepped oil cylinders. The stepped clutch includes a clutch shaft 200, a piston 201, an inner seal ring 202, an outer seal ring 203, a spacer 204, and a buffer orifice. 205, friction plate 206, spring 207, clutch hub 208, gear assembly 209, outer oil cavity 210 and inner oil cavity 211, when the stepped clutch is combined, the pressure oil enters the inner oil cavity 211 and 211 between the piston 201 and the oil cylinder in turn. The outer oil cavity 210 is provided with a buffer orifice 205 between the inner oil cavity 211 and the outer oil cavity 210, so as to reduce the impact force when the clutch is engaged by prolonging the oil filling and boosting time. The actual application effect is not good, which is manifested in that the buffer orifice 205 is too small, and the oil filling time is too long to cause a gear shift problem. If the buffer orifice 205 is too large, the oil filling time is short, resulting in a large shift impact.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a buffer clutch and a gearbox, so that the clutch can be smoothly combined, the impact of shifting is reduced, the separation is fast, and the problem of gear interference caused by slow oil return during gear switching is avoided.

For this purpose, the present invention adopts the following technical solutions:

A buffer clutch, comprising: a clutch shaft and a buffer piston, a main piston, a wheel hub, a gear assembly and a friction plate assembly all sleeved on the clutch shaft; the clutch shaft is respectively fixed with the buffer piston and the wheel hub , the gear assembly can rotate relative to the clutch shaft, and a main oil passage and a buffer oil passage that are not connected to each other are respectively arranged in the clutch shaft;

The buffer pressure oil in the buffer oil passage 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 passage can push the other side of the main piston. One side moves in a direction close to the friction plate assembly and abuts with the friction plate assembly, so that the gear assembly is selectively connected with the wheel hub through the friction plate assembly.

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

Preferably, a buffer oil hole is provided on the main piston, and the buffer oil hole is respectively connected to the buffer oil passage and the buffer oil cavity.

Preferably, it also includes an isolation frame, the isolation frame is sleeved on the clutch shaft, the main piston and the isolation frame are in sealing and sliding fit to form a main oil cavity, and the main oil cavity is communicated with the main oil passage.

Preferably, the main piston includes:

a main base, which is sleeved on the clutch shaft;

a main sealing layer, which is arranged on one side of the main base body close to the spacer frame and is located between the clutch shaft and the spacer frame.

Preferably, the buffer piston includes:

a buffer base, which is sleeved on the clutch shaft;

The buffer sealing layer is arranged on the outer side of the buffer base and abuts against the main piston.

Preferably, a reset piece is also included, the reset piece is sleeved on the clutch shaft, the reset piece is located between the buffer piston and the main piston and can abut with them respectively.

Preferably, the friction plate assembly includes:

an active friction plate, which is sleeved on the wheel hub and located between the wheel hub and the gear assembly, and the active friction plate can abut on the main piston;

A driven friction plate is disposed opposite to the driving friction plate and connected to the gear assembly, and the driven friction plate can selectively abut against the driving friction plate.

Preferably, a first retaining ring is also included, and the hub is mounted on the clutch shaft through the first retaining ring.

In order to achieve the above object, the present invention also provides a gearbox including the above buffer clutch.

Beneficial effects of the present invention:

In the buffer clutch provided by the present invention, when combined, the main pressure oil flowing out of the main oil passage pushes the main piston to move in the direction close to the friction plate assembly and abuts it, and at the same time, the buffer pressure oil flowing out from the buffer oil passage enters the main piston. There is a hydraulic load force between the piston and the buffer piston and 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, and the transmission power is transmitted through the clutch shaft, hub, friction plate assembly and gear assembly , and finally output by the gear assembly.

When the separation is performed, the main pressure oil flowing from the main oil passage to the main piston is cut off. Under the action of the hydraulic load pressure generated by the buffer pressure oil on the main piston, the main piston returns quickly, and the main piston is separated from the friction plate assembly, making the gear assembly By separating the friction plate assembly from the hub, the power transmission is cut off and the clutch is quickly disengaged.

Compared with the prior art, the buffer pressure oil is introduced between the main piston and the buffer piston to generate a hydraulic load force on the main piston. When the clutch is engaged, the thrust exerted by the main pressure oil on the main piston needs to overcome the hydraulic load force and the clutch oil pressure. Push the main piston smoothly and quickly, reduce the impact force when the clutch is engaged, improve the stability of power transmission, and avoid the large impact load and gear problem on each element of the transmission system; when the clutch is disengaged, the hydraulic load force provided by the buffer pressure oil makes the The main piston returns quickly, the clutch disengages quickly and completely, avoiding gear interference, and the hydraulic load force generated by the buffer pressure oil can ensure that the main piston returns in time, avoiding problems such as high temperature and friction plate sintering caused by long-term slippage of the clutch.

The invention also provides a gearbox, including the above buffer clutch, which has smooth and fast shifting, good shifting comfort, and ensures the reliability of the transmission system.

Description of drawings

1 is a schematic structural diagram of a prior art planar clutch;

2 is a schematic structural diagram of a prior art stepped clutch;

3 is a schematic structural diagram of the buffer clutch of the present invention;

Fig. 4 is the structural schematic diagram of the main piston in the buffer clutch of the present invention;

FIG. 5 is a schematic structural diagram of the buffer piston in the buffer clutch of the present invention.

In the picture:

100, clutch shaft; 101, piston; 102, spacer; 103, sealing ring; 104, friction plate; 105, spring; 106, clutch hub; 107, oil chamber; 108, gear assembly;

200, clutch shaft; 201, piston; 202, inner seal ring; 203, outer seal ring; 204, spacer frame; 205, buffer orifice; 206, friction plate; 207, spring; 208, clutch hub; 209, gear Assembly; 210, outer oil cavity; 211, inner oil cavity;

1. Clutch shaft; 2. Buffer piston; 3. Main piston; 4. Hub; 5. Gear assembly; 6. Friction plate assembly; 7. Buffer oil chamber; 8. Isolator; 9. Main oil chamber; 10. reset piece;

11, main oil passage; 12, buffer oil passage; 13, first retaining ring; 14, second retaining ring; 15, first bearing; 16, second bearing; 17, third retaining ring;

21. Buffer matrix; 22. Buffer sealing layer;

211, the first buffer part; 212, the second buffer part; 213, the third buffer part; 214, the fourth buffer part;

31. Main substrate; 32. Main sealing layer;

311, the first main connection part; 312, the second main connection part; 313, the third main connection part; 314, the fourth main connection part; 315, the sliding part; 316, the abutting part; 3151, the buffer oil hole;

61. Active friction plate; 62. Driven friction plate; 63. Baffle bracket.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only the present invention. Some examples, but not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, unless otherwise expressly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integrated ; It can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

In the present invention, unless otherwise expressly specified and limited, a first feature "on" or "under" a second feature may include the first and second features in direct contact, or may include the first and second features Not directly but through additional features between them. Also, the first feature being "above", "over" and "above" the second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

The technical solutions of the present invention are further described below with reference to the accompanying drawings and through specific embodiments.

This embodiment provides a buffer clutch, which is suitable for gearboxes of loaders and graders. As shown in FIG. 3 , the buffer clutch includes a clutch shaft 1, a buffer piston 2, a main piston 3, a hub 4, a gear assembly 5 and a friction plate assembly 6, and the clutch shaft 1 respectively passes through the buffer piston 2, the main piston 3, the hub 4. The gear assembly 5, the friction plate assembly 6, and the clutch shaft 1 play a transmission role. Among them, 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, and the main oil passage 11 and the buffer oil passage 12 are respectively provided in the clutch shaft 1. The main oil passage 11 The inlet of the main oil passage 11 is used for the main pressure oil, and the inlet of the buffer oil passage 12 is used for the buffer pressure oil. The buffer pressure oil in the buffer oil passage 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 passage 11 can push the other side of the main piston 3 along the clutch. The axial direction of the shaft 1 moves in the direction close to the friction plate assembly 6 and abuts 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, so as to complete the process of clutch coupling.

When the buffer clutch provided in this embodiment is combined, the main pressure oil flowing out from the main oil passage 11 pushes the main piston 3 to move in the direction close to the friction plate assembly 6 and abuts it, and at the same time, the main pressure oil flowing out from the buffer oil passage 12 The buffer pressure oil enters between the main piston 3 and the buffer piston 2 and produces a 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 the transmission power passes through the clutch shaft 1, The hub 4 , the friction plate assembly 6 and the gear assembly 5 transmit, and finally the gear assembly 5 outputs.

When the separation is performed, the main pressure oil flowing to the main piston 3 in the main oil passage 11 is cut off. Under the action of the hydraulic load pressure generated by the buffer pressure oil on the main piston 3, the main piston 3 returns quickly, and the main piston 3 is separated from the friction plate. assembly 6, so that the gear assembly 5 is separated from the wheel hub 4 through the friction plate assembly 6, cutting off the power transmission, and realizing the quick separation of the clutch.

Compared with the prior art, the buffer pressure oil is introduced between the main piston 3 and the buffer piston 2 to generate a hydraulic load force on the main piston 3. When the clutch is engaged, the thrust exerted by the main pressure oil on the main piston 3 needs to overcome the hydraulic load force. , The clutch oil pressure pushes the main piston 3 smoothly and quickly, reducing the impact force when the clutch is engaged, improving the stability of the power transmission, and avoiding the large impact load and gear problem of each component of the transmission system; when the clutch is disengaged, the buffer pressure oil provides The high hydraulic load force makes the main piston 3 return quickly, and the clutch disengages quickly and completely, avoiding gear interference, and the hydraulic load force generated by the buffer pressure oil can ensure that the main piston 3 returns in time to avoid the clutch slipping for a long time. Friction plate sintering and other problems.

Further, as shown in FIG. 3 , the clutch shaft 1 is used as a power transmission shaft, and a first axial hole is opened from the shaft end of the clutch shaft 1 along its axial direction, and a first diameter is opened on the clutch shaft 1 along its radial direction. The first radial hole and the first axial hole communicate with each other to form the main oil passage 11, so that the main pressure oil flows into the first radial hole from the first axial hole. At the same time, a second axial hole is opened along the axial direction of the shaft end on the same side of the clutch shaft 1, and the axis of the second axial hole and the axis of the first axial hole are parallel to each other, that is, the first axial hole and the second shaft are parallel to each other. The two holes are not connected to each other and are independent oil passages. A second radial hole is formed on the clutch shaft 1 along its radial direction, and the second radial hole and the second axial hole communicate with each other to form a buffer oil passage 12, so that the buffer pressure oil flows from the second axial hole to the second inside the radial hole.

In order to realize that the main pressure oil flowing out from the main oil passage 11 can push the main piston 3 to move in 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 also includes an isolation frame 8, which isolates the The frame 8 is an annular structure, and the spacer frame 8 is sleeved on the clutch shaft 1 . Specifically, there is an interference fit between the spacer 8 and the clutch shaft 1 . The main piston 3 and the spacer 8 are in sealing and sliding fit to form the main oil cavity 9. The main oil cavity 9 is communicated with the first radial hole of the main oil passage 11. The pressure oil enters the main oil chamber 9 and pushes the main piston 3 to move toward the direction close to the friction plate assembly 6 .

Further, as shown in FIGS. 3-4 , the main piston 3 includes a main base 31 and a main sealing layer 32 that are connected to each other, the main base 31 is made of metal, the main base 31 is sleeved on the clutch shaft 1 , and the main base 31 surrounds and isolates Rack 8 set. A main sealing layer 32 is provided on the side of the main base 31 close to the isolator 8 . The main sealing layer 32 is located between the clutch shaft 1 and the isolator 8 and has a sealing effect, so that the main oil cavity 9 is a cavity with a sealing structure.

Specifically, the main base 31 includes a first main connection part 311 , a second main connection part 312 , a third main connection part 313 , a fourth main connection part 314 , a sliding part 315 and an abutting part 316 , which are connected to each other. The sliding part 315 The sliding part 315 is connected to the first main connecting part 311, and both the first main connecting part 311 and the third main connecting part 313 are arranged obliquely with the axial direction of the clutch shaft 1. A second main connection part 312 is disposed between a main connection part 311 and a third main connection part 313 , the second main connection part 312 is arranged along the axial direction perpendicular to the clutch shaft 1 , and the third main connection part 313 is connected to the fourth main connection part 312 . The main connecting portion 314 and the fourth main connecting portion 314 are arranged parallel to the axial direction of the clutch shaft 1, so that the first main connecting portion 311, the second main connecting portion 312, the third main connecting portion 313, the fourth main connecting portion 314, A main oil chamber 9 is formed between the clutch shaft 1 and the spacer 8 . One end of the fourth main connecting portion 314 that is not connected to the third main connecting portion 313 extends outward along the radial direction of the clutch shaft 1 to form an abutting portion 316. The abutting portion 316 is arranged in parallel with the friction plate assembly 6 to facilitate contact The connecting portion 316 abuts against the friction plate assembly 6 .

It can be understood that the abutting portion 316 mainly plays the role of contacting and abutting with the friction plate assembly 6, so the main sealing layer 32 only needs to coat the sliding mating surface of the main base 31, such as the first main connecting portion 311, the first main connecting portion 311, the second For the second main connecting portion 312 , the third main connecting portion 313 , and the fourth main connecting portion 314 , the abutting portion 316 does not need to be coated with a sealing layer, which saves production costs.

As shown in FIG. 3 , in order to realize the buffer pressure oil flowing out from the buffer oil passage 12 , the main piston 3 can be pushed to move away from the friction plate assembly 6 along the axial direction of the clutch shaft 1 . The buffer oil cavity 7 is formed by sealing and sliding cooperation. The buffer oil cavity 7 is connected to the buffer oil passage 12. The buffer pressure oil flowing out from the second radial hole of the buffer oil passage 12 enters the buffer oil cavity 7 and pushes the main piston 3 to the Move away from the friction plate assembly 6 .

Since the outlet of the buffer oil passage 12 is arranged on the circumferential surface of the clutch shaft 1, the buffer oil chamber 7 is located between the main piston 3 and the buffer piston 2. In order to facilitate the mutual communication between the buffer oil passage 12 and the buffer oil chamber 7, in the The sliding part 315 of the main piston 3 is provided with a buffer oil hole 3151 (as shown in FIG. 3 ). The buffer oil hole 3151 is arranged on the part where the main piston 3 contacts the clutch and is arranged along the radial direction of the clutch shaft 1 . The oil hole 3151 is connected to the buffer oil passage 12 and the buffer oil chamber 7 respectively, and the buffer oil hole 3151 plays the 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 , which is used to provide hydraulic load force and reset driving force for the main piston 3 .

Further, as shown in FIGS. 3 and 5 , the buffer piston 2 includes a buffer base 21 and a buffer seal layer 22 , the buffer base 21 is sleeved on the clutch shaft 1 , and a buffer seal layer 22 is provided on the outside of the buffer base 21 , and the buffer seal The layer 22 abuts against the main piston 3 for sealing the gap between the main piston 3 and the buffer base 21 .

Specifically, the buffer base 21 includes a first buffer part 211 , a second buffer part 212 , a third buffer part 213 and a fourth buffer part 214 , the first buffer part 211 , the third buffer part 213 and the fourth buffer part 214 are arranged perpendicular to the axial direction of the clutch shaft 1 , and the second buffer portion 212 is arranged between the first buffer portion 211 and the third buffer portion 213 and is arranged parallel to the axial direction of the clutch shaft 1 . The first buffer portion 211 and the second buffer portion 212 extend into the hub 4 by a bending structure, and a buffer seal layer 22 is provided at the end of the fourth buffer portion 214 that is not connected to the third buffer portion 213 . The buffer seal layer 22 It is wrapped around the end of the end, so that the buffer oil chamber 7 of the sealing structure is formed between the main piston 3 and the buffer piston 2 .

In order to further improve the stability of the clutch during the combination process and the sensitivity during separation, as shown in FIG. 3 , the buffer clutch further includes a reset member 10 , which can be a spring, and the reset member 10 is sleeved on the clutch shaft 1 . , the reset member 10 is located between the buffer piston 2 and the main piston 3 and can abut with them respectively. Specifically, the reset member 10 is disposed around the first main connecting portion 311 , the second main connecting portion 312 , the sliding portion 315 of the main piston 3 , the first buffer portion 211 and the second buffer portion 212 of the clutch shaft 1 and the buffer piston 2 . into the space.

When the clutch is engaged, the main pressure oil entering the main oil chamber 9 pushes the main piston 3 to move toward the friction plate assembly 6, and the inner side of the main piston 3 abuts against the reset member 10, and then gradually compresses during the continuous movement. The reset piece 10, at this time, the main piston 3 needs to overcome the hydraulic load force of the buffer pressure oil on the main piston 3 and the force of the spring at the same time, thereby enhancing the stability of the movement of the main piston 3 to the direction of the friction plate assembly 6, and greatly reducing the The impact of shifting is improved; when the clutch is disengaged, under the hydraulic load pressure generated by the buffer pressure oil on the main piston 3 and the restoring force of the reset member 10, the main piston 3 can quickly return to the position, cut off the power transmission, and realize the clutch quickly. Separation, avoiding the gear interference problem during gear switching, and significantly improving the reliability of the transmission system.

Since the hub 4 is sleeved on the clutch shaft 1, in order to ensure the connection stability between the two, the buffer clutch also includes a first retaining ring 13, the first retaining ring 13 is sleeved on the clutch shaft 1, and the hub 4 passes through The first retaining ring 13 is installed on the clutch shaft 1, and the first retaining ring 13 plays a role of fixing and installation. Optionally, the buffer clutch further includes a second retaining ring 14 , the second retaining ring 14 is sleeved on the clutch shaft 1 , and both sides of the second retaining ring 14 abut against the buffer piston 2 and the hub 4 respectively. The ring 14 acts as an axial limiter.

Among them, the hub 4 is provided with an accommodating groove along its axial direction on the side close to the buffer piston 2, and the accommodating groove plays the role of partially accommodating the buffer piston 2, providing a certain accommodating space for the buffer piston 2 for the buffer piston 2 avoidance.

In order to realize the selective connection between the hub 4 and the gear assembly 5, a friction plate assembly 6 is provided between the hub 4 and the gear assembly 5. The friction plate assembly 6 includes a driving friction plate 61 and a driven friction plate 62. The plate 61 is sleeved on the wheel hub 4, the active friction plate 61 is located between the wheel hub 4 and the gear assembly 5 and is connected to the wheel hub 4, the driven friction plate 62 is opposite to the active friction plate 61 and is connected to the gear assembly 5. The friction plate 61 can abut against the main piston 3 , so that the driven friction plate 62 can selectively abut against the driving friction plate 61 , thereby realizing power transmission and cutting between the hub 4 and the gear assembly 5 .

Among them, the number of the active friction plates 61 and the driven friction plates 62 is multiple, and a driven friction plate 62 is arranged between two adjacent active friction plates 61, so that the active friction plates 61 and the driven friction plates 62 are arranged in a staggered manner. Increase the power transmission effect between the hub 4 and the gear assembly 5.

Since the middle driven friction plate 62 is sandwiched between the two adjacent active friction plates 61, the driven friction plate 62 farthest from the master piston 3 may be suspended and affect the power transmission effect. In order to solve this problem The problem, the friction plate assembly 6 also includes a baffle bracket 63, which is installed on the hub 4 and is located on the side away from the main piston 3, so that the two sides of the driven friction plate 62 farthest from the main piston 3 are respectively It can abut against an active friction plate 61 and a baffle bracket 63, and the baffle bracket 63 acts as a resistance to avoid the suspension of the driven friction plate 62, so that each of the active friction plate 61 and the driven friction plate 62 can be affected. Force against pressure to ensure the stability of the power combination.

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 retaining ring 17 , which are all sleeved on the clutch shaft 1 . A bearing 15 is specifically a needle bearing. The first bearing 15 is sleeved on the clutch shaft 1 and is located between the clutch shaft 1 and the gear assembly 5 to ensure smooth rotation of the gears. The second bearing 16 is specifically a thrust bearing, the number of the second bearing 16 is two, the two second bearings 16 are respectively arranged on both sides of the gear assembly 5 , and one second bearing 16 is located between the first retaining ring 13 and the gear assembly 5 . Between the assemblies 5 , another second bearing 16 is located between the gear assembly 5 and the third retaining ring 17 , and the third retaining ring 17 plays a limiting role. Through the cooperation of the first bearing 15 , the second bearing 16 and the third retaining ring 17 , the gear assembly 5 is stably supported on the clutch shaft 1 through the first bearing 15 , the second bearing 16 and the third retaining ring 17 .

It should be noted that 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 are all two, and are symmetrically arranged on both sides of the spacer 8 respectively. Symmetrical setting to meet the shifting requirements of different gears. It can be understood that the part of the dashed line in the main oil passage 11 is not shown in the current section, but is the part that is blocked. As shown in FIG. 3 , the number of main oil passages 11 is two, the two main oil passages 11 are independent of each other, and each main oil passage 11 is connected to a main oil chamber 9 for controlling the hub 4 on the same side of the spacer frame 8 Combination and separation of gear assembly 5. For example: the main pressure oil entering the main oil passage 11 indicated by the solid line is used to push the main piston 3 located on the right side of the spacer 8 to achieve 1st gear; the main pressure oil entering the main oil passage 11 indicated by the dashed line is used to push The main piston 3 on the left side of the spacer frame 8 realizes 2nd gear.

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

When combined, the pressure of the main pressure oil is about 1.2MPa～2.3MPa, the main pressure oil enters the main oil chamber 9 through the main oil passage 11, and pushes the main piston 3 to move in the direction close to the friction plate assembly 6; the pressure of the buffer pressure oil is about The buffer pressure oil passes through the buffer oil passage 12 and the buffer oil hole 3151 in sequence, and enters the buffer oil chamber 7 between the main piston 3 and the buffer piston 2, and generates a hydraulic load force on the main piston 3, so that the main pressure The oil pushes the main piston 3 to press the driving friction plate 61 smoothly and quickly, so that the driving friction plate 61 and the driven friction plate 62 abut each other, so that the 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 gear assembly 5.

During separation, the main pressure oil flowing from the main oil passage 11 to the main piston 3 is cut off. Under the hydraulic load force generated by the buffer pressure oil on the main piston 3 and the reset action of the reset member 10, the main piston 3 returns quickly to cut off the power transmission. , to realize the rapid separation of the clutch. When the reset member 10 breaks or the spring force of the reset member 10 decays, the hydraulic load force generated by the buffer pressure oil can ensure that the main piston 3 returns in time to avoid the buffer clutch slipping for a long time. Component 6 sintering, etc.

The present embodiment also provides a gearbox, including the above-mentioned buffer clutch, which has smooth and fast shifting, good shifting comfort, and ensures the reliability of the transmission system.

In the description herein, it should be understood that the terms "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of description and simplified operation, It is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

In the description of this specification, reference to the description of the terms "an embodiment", "example", etc. means 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 present invention middle. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example.

In addition, the above are only preferred embodiments of the present invention and applied technical principles. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and can also include more other equivalent embodiments without departing from the concept of the present invention. The scope is determined by the scope of the appended claims.

Claims (10)

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.

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