CN211820454U

CN211820454U - Damping coupling

Info

Publication number: CN211820454U
Application number: CN201922367895.3U
Authority: CN
Inventors: 孙靖; 陈云飞; 付天娇; 梁文强
Original assignee: Yinlong New Energy Co Ltd
Current assignee: Yinlong New Energy Co Ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-10-30
Anticipated expiration: 2029-12-25

Abstract

The utility model provides a damping shaft coupling, include: the end surface of the first end part is provided with a first boss; the second end part is in a sleeve shape with one open end, the inner end surface of the second end part is provided with a second boss, and at least one part of the first end part can extend into the second end part; the connecting claw is arranged between the first end part and the second end part and is provided with a connecting concave part, the second boss extends into the connecting concave part and is in contact fit with two sides of the connecting concave part, the second end part and the connecting claw synchronously rotate, and the first boss extends into the connecting concave part and is in clearance fit with the side wall of the connecting concave part to form a hydraulic cavity; and an elastic member disposed in the hydraulic chamber and providing an elastic force for connecting the side wall of the recess and the side wall of the first boss to move in a direction away from each other. The utility model provides a hard link problem that produces the damage easily between automobile motor and the axle among the prior art.

Description

Damping coupling

Technical Field

The utility model relates to a shaft coupling technical field particularly, relates to a damping shaft coupling.

Background

The existing elastic coupling is to add elastic material between the master and slave connecting claws to realize the elastic function of the coupling. However, the damping capacity of the existing elastic coupling is closely related to the elastic coefficient of the elastic material, and the performance and the service life of the elastic coupling are directly influenced because the elastic material is easy to fatigue and age after long-term use.

In the field of new energy automobiles, a transmission shaft is directly connected with a motor and an axle of an existing new energy automobile, the transmission shaft is mostly a spline connection shaft with universal joints at two ends, although the transmission shaft can transmit the torque and the rotating speed of the motor to the axle in real time and can also transmit the state of the axle to the motor in real time, the axle and the motor are in hard connection, independent action intervals are lacked before each other, abnormal sound is easily caused by resonance, and the motor and the axle are easily damaged.

SUMMERY OF THE UTILITY MODEL

A primary object of the present invention is to provide a damping coupling to solve the problem of damage easily caused by hard links between the automobile motor and the axle in the prior art.

In order to achieve the above object, the utility model provides a damping coupling, include: the end surface of the first end part is provided with a first boss; the second end part is in a sleeve shape with one open end, the inner end surface of the second end part is provided with a second boss, and at least one part of the first end part can extend into the second end part; the connecting claw is arranged between the first end part and the second end part and is provided with a connecting concave part, the second boss extends into the connecting concave part and is in contact fit with two sides of the connecting concave part, the second end part and the connecting claw synchronously rotate, and the first boss extends into the connecting concave part and is in clearance fit with the side wall of the connecting concave part to form a hydraulic cavity; the elastic piece is arranged in the hydraulic cavity, two ends of the elastic piece are respectively abutted against the side wall of the connecting concave part and the side wall of the first boss, and the elastic piece provides elastic force for moving in the direction away from each other for the side wall of the connecting concave part and the side wall of the first boss.

Furthermore, the connecting concave part comprises a first concave part and a second concave part which are axially arranged, the first boss extends into the first concave part, two ends of the elastic piece are respectively abutted against the first boss and the first concave part, the second boss extends into the second concave part, and along the circumferential direction of the connecting claw, the arc length of two sides of the first concave part is greater than that of two sides of the second concave part.

Furthermore, the first bosses are fan-shaped and are multiple, and the first bosses are arranged at intervals along the circumferential direction of the first end part; and/or the second boss is fan-shaped and a plurality of, and each second boss sets up along the circumference interval of second tip.

Furthermore, a limiting groove is formed in the middle of the first end portion and the second end portion, and the middle of the connecting claw extends into the limiting groove and rotates in the limiting groove.

Further, the side walls of the first boss and the connecting concave part are provided with mounting holes, the elastic piece is accommodated in the mounting holes, and the sum of the depths of the two mounting holes is larger than the minimum length of the elastic piece.

Furthermore, the elastic pieces are multiple, and at least one elastic piece is arranged between the connecting concave part and the two adjacent side faces of the first boss.

Further, the periphery side of the first end portion is provided with an oil guide groove, the oil guide groove extends along the circumferential direction of the first end portion and is communicated with the hydraulic cavity.

Further, the damping coupling also comprises a cover plate, the cover plate is covered at the opening end of the second end part, and the first end part is stopped from retreating from the second end part.

Further, the damping coupling still includes pars contractilis, universal joint portion and the connecting portion that connect in order, and pars contractilis is connected with first end or second end, and connecting portion are connected with external equipment.

Further, the telescopic part includes: the telescopic shaft sleeve is connected with the first end part or the second end part; the telescopic shaft is connected with the universal joint part, penetrates through the telescopic shaft sleeve and can axially move relative to the telescopic shaft sleeve.

Furthermore, the inner wall of the telescopic shaft sleeve and the outer wall of the telescopic shaft are provided with splines, and the splines are meshed with each other, so that the telescopic shaft sleeve and the telescopic shaft rotate synchronously.

Further, the gimbal portion includes: the main fork is connected with the telescopic part; a secondary fork; the fork joint extends into the through holes of the main fork and the auxiliary fork and connects the main fork and the auxiliary fork; the bearing is sleeved on the shaft of the fork joint.

Use the technical scheme of the utility model, through set up first boss in the first end, set up the second boss in the second end, be clearance fit and contact fit respectively between the connection concave part of connection claw and first boss and the second boss, and be provided with the elastic component between connection claw and first boss, when first end rotates like this, first boss extrusion elastic component, the elastic component extrusion connection claw, connection claw extrudes the second boss, thereby realize that first end drives the synchronous pivoted effect of second end, because first boss and the clearance of being connected between the concave part, make and have small relative rotation between connection claw and the first end. The above-mentioned mode of setting up has utilized the damping characteristic to eliminate the resonance frequency interval to eliminate the abnormal sound, simultaneously because the setting in hydraulic pressure chamber makes first end and second end all have certain independent activity interval separately, has avoided the injury of hard impact to the two. And because the second end is the cover barrel-shaped, therefore the part of its side can reduce the risk that hydraulic oil leaked, and the installation between messenger's connection claw and first end and the second end is more convenient in the detachable mode that sets up of connection claw.

Drawings

The accompanying drawings, which form a part of the present application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 shows a schematic structural view of the damping coupling of the present invention;

FIG. 2 shows an exploded view of the damping coupling of FIG. 1;

FIG. 3 shows an exploded view of the first end, the second end and the connecting jaws of the damping coupling of FIG. 1;

FIG. 4 shows a front view of FIG. 3;

FIG. 5 shows a top view of FIG. 3;

FIG. 6 shows a schematic view of a first end of the damping coupling of FIG. 1;

FIG. 7 shows a schematic view of the coupling jaws of the damping coupling of FIG. 1;

FIG. 8 shows a schematic view of the second end of the damping coupling of FIG. 1;

FIG. 9 shows a schematic structural view of the telescoping section of the damping coupling of FIG. 1;

fig. 10 shows a schematic view of the joint part and the connection part of the damping coupling in fig. 1.

Wherein the figures include the following reference numerals:

10. a first end portion; 11. a first boss; 12. a limiting groove; 13. mounting holes; 14. an oil guide groove; 20. a second end portion; 21. a second boss; 30. a connecting claw; 31. a connecting recess; 311. a first recess; 312. a second recess; 40. an elastic member; 50. a cover plate; 60. a telescopic part; 61. a telescopic shaft sleeve; 62. a telescopic shaft; 70. a gimbal portion; 71. a main fork; 72. a secondary fork; 73. a fork joint; 74. a bearing; 80. a connecting portion.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

It is noted that, unless otherwise indicated, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

In the present application, where the contrary is not intended, the use of directional words such as "upper, lower, top and bottom" is generally with respect to the orientation shown in the drawings, or with respect to the component itself in the vertical, perpendicular or gravitational direction; likewise, for ease of understanding and description, "inner and outer" refer to the inner and outer relative to the profile of the components themselves, but the above directional words are not intended to limit the invention.

In order to solve the problem that the hard link produced the damage easily between the car motor among the prior art and the axle, the utility model provides a damping shaft coupling.

A damping coupling as shown in fig. 1 to 10 comprises a first end portion 10, a second end portion 20, a connecting claw 30 and an elastic member 40, wherein the end surface of the first end portion 10 is provided with a first boss 11; the second end part 20 is in a sleeve shape with one open end, the inner end surface of the second end part 20 is provided with a second boss 21, and at least one part of the first end part 10 can extend into the second end part 20; the connecting claw 30 is arranged between the first end part 10 and the second end part 20 and is provided with a connecting concave part 31, the second boss 21 extends into the connecting concave part 31 and is in contact fit with two sides of the connecting concave part 31, the second end part 20 and the connecting claw 30 rotate synchronously, and the first boss 11 extends into the connecting concave part 31 and is in clearance fit with the side wall of the connecting concave part 31 to form a hydraulic cavity; the elastic member 40 is disposed in the hydraulic chamber, and both ends of the elastic member 40 abut against the side wall of the connection recess 31 and the side wall of the first boss 11, respectively, and provide elastic force for the side wall of the connection recess 31 and the side wall of the first boss 11 to move in directions away from each other.

In the embodiment, the first boss 11 is arranged in the first end portion 10, the second boss 21 is arranged in the second end portion 20, the connection concave portion 31 of the connection claw 30 is in clearance fit and contact fit with the first boss 11 and the second boss 21 respectively, and the elastic member 40 is arranged between the connection claw 30 and the first boss 11, so that when the first end portion 10 rotates, the first boss 11 extrudes the elastic member 40, the elastic member 40 extrudes the connection claw 30, and the connection claw 30 extrudes the second boss 21, thereby realizing the effect that the first end portion 10 drives the second end portion 20 to synchronously rotate, and because of the clearance between the first boss 11 and the connection concave portion 31, the connection claw 30 and the first end portion 10 slightly rotate relatively. The arrangement mode utilizes the damping characteristic to eliminate the resonant frequency interval, thereby eliminating abnormal sound, and simultaneously, the arrangement of the hydraulic cavity ensures that the first end part 10 and the second end part 20 respectively have certain independent moving intervals, thereby avoiding the damage of hard impact to the first end part and the second end part. And because the second end portion 20 is sleeve-shaped, the lateral part of the second end portion can reduce the risk of hydraulic oil leakage, and the connection claw 30 is detachably arranged, so that the connection claw 30 and the first end portion 10 and the second end portion 20 are more convenient to mount.

In the present embodiment, the damping coupling is applied to an automobile as an example, in which the first end portion 10 is drivingly connected to a motor as a driving end, and the second end portion 20 is drivingly connected to an axle as a driven end. Of course, the master-slave relationship between the first end 10 and the second end 20 may be varied depending on the application.

It should be noted that, in the present embodiment, the contact fit between the second boss 21 and the connection recess 31 means that both side surfaces of the second boss 21 are in contact with the connection recess 31, that is, the second boss 21 and the connection recess 31 are in close fit, as shown in fig. 4, the two move synchronously, and do not rotate relatively, and the first boss 11 and the connection recess 31 rotate relatively.

The connecting claw 30 of the present embodiment includes a central circular portion and a sector portion located outside the circular portion, as shown in fig. 7, wherein the center of the sector portion is connected to the circular portion, so that the portion outside the circular portion without the entity of the sector portion is the connecting concave portion 31. Similarly, the same is true for the first boss 11 on the first end portion 10 and the second boss 21 on the second end portion 20, and taking the first end portion 10 and the connecting claw 30 as an example, the portion of the first end portion 10 without the first boss 11 is a concave portion, when the connecting claw 30 is butted with the first end portion 10, the first boss 11 extends into the connecting concave portion 31, and the fan-shaped portion extends into the concave portion, so that the butting is realized.

The second end portion 20 of the present embodiment includes an integral outer portion and an end portion, as shown in fig. 8, wherein the outer portion is in a sleeve shape with two open ends, and the end portion shields one end of the outer portion, so that the other end of the outer portion is open, so that the first end portion 10 enters into the butt joint, and the second boss 21 is disposed on the end surface of the end portion facing the inner cavity of the outer portion.

In the present embodiment, the connecting recess 31 includes a first recess 311 and a second recess 312 arranged axially, as shown in fig. 7, the first boss 11 extends into the first recess 311, two ends of the elastic member 40 respectively abut against the first boss 11 and the first recess 311, the second boss 21 extends into the second recess 312, and the arc length of two sides of the first recess 311 is greater than the arc length of two sides of the second recess 312 along the circumferential direction of the connecting claw 30.

Specifically, for the convenience of processing, the first boss 11 and the second boss 21 of the present embodiment are identical in size and shape, on the basis that the connection claw 30 of the present embodiment is formed by integrally stacking a base plate and a connection plate, the connection recess 31 penetrates the base plate and the connection plate in the axial direction of the connection claw 30, the portion of the connection recess 31 on the base plate is the second recess 312, the portion of the connection recess 31 on the connection plate is the first recess 311, when the connection claw 30 is butted against the first end portion 10 and the second end portion 20, the first boss 11 only extends into the first recess 311 and does not extend into the second recess 312, similarly, the second boss 21 only extends into the second recess 312 and does not extend into the first recess 311, the first recess 311 and the second recess 312 are fan-shaped, and are substantially similar in shape, except that the fan-shaped portions are slightly smaller in size, the second recess 312 on the base plate is smaller than the first recess 311, that is, the arc length of both sides of the first recess 311 is greater than that of both sides of the second recess 312, as shown in fig. 5, because the connecting claw 30 is in clearance fit with the first end 10, and thus the arc length of the first recess 311 needs to be greater, so that a hydraulic pressure chamber is naturally formed with the first boss 11, and the second recess 312 is in contact fit with the second boss 21, so that the size of the second recess 312 is substantially the same as that of the second boss 21.

It should be noted that the above arrangement is based on the same size and shape of the first boss 11 and the second boss 21, that is, the present embodiment realizes the matching relationship between the first end portion 10 and the second end portion 20 by changing the shape structure of the connecting claw 30. Besides, the fitting relationship can also be realized by changing the size of the first boss 11, for example, the size of the first recess 311 and the size of the second recess 312 are the same, and the size of the first boss 11 is slightly smaller than the size of the second boss 21, so that the clearance fit between the first boss 11 and the first recess 311 can also be realized, and the contact fit between the second boss 21 and the second recess 312 can also be realized.

Alternatively, as shown in fig. 6 and 8, the first bosses 11 are fan-shaped and plural, and each first boss 11 is arranged at intervals in the circumferential direction of the first end portion 10, and similarly, the second bosses 21 are fan-shaped and plural, and each second boss 21 is arranged at intervals in the circumferential direction of the second end portion 20. The first boss 11 and the second boss 21 of the present embodiment are provided with two bosses, and are respectively symmetrically provided along the circumferential direction of the first end portion 10 and the second end portion 20, and correspondingly, the first recess 311 and the second recess 312 are also provided with two bosses, so that the first boss 11 and the first recess 311, and the second boss 21 and the second recess 312 are respectively provided in a one-to-one correspondence manner, thereby reducing impact damage and ensuring stability and reliability of transmission.

Optionally, a limiting groove 12 is formed in the middle of the first end portion 10 and the second end portion 20, that is, a circular groove is formed between the two first bosses 11, the circular portion in the middle of the connecting claw 30 can extend into the limiting groove 12 and rotate in the limiting groove 12, and the rotation of the connecting claw 30 is limited by the matching of the limiting groove 12 and the circular portion, so that the connecting claw 30 can only rotate in a specific circumferential range, and stable and continuous operation of the damping coupler is ensured.

In the present embodiment, the elastic member 40 is provided between the connecting recess 31 and the adjacent two side surfaces of the first boss 11, as shown in fig. 5, and abuts against the two side surfaces. The side walls of the first boss 11 and the first recess 311 are provided with mounting holes 13, as shown in fig. 6 and 7, the central axes of the two mounting holes 13 are overlapped, the elastic member 40 is a spring, one end of the spring is accommodated in the mounting hole 13 of the first boss 11, the other end of the spring is accommodated in the mounting hole 13 of the first recess 311, and the sum of the depths of the two mounting holes 13 is greater than the minimum length of the elastic member 40 which is compressed. Thus, the adjacent both side surfaces of the first boss 11 and the first recess 311 are moved away from each other by the elastic force of the elastic member 40.

Preferably, the elastic member 40 is plural, and at least one elastic member 40 is disposed between all the connecting recesses 31 and the adjacent two sides of the first bosses 11. Because the first boss 11 and the first recess 311 are both provided with two, the number of the elastic members 40 is four, and the elastic members 40 are distributed in four hydraulic cavities formed by the first boss 11 and the first recess 311, for one first boss 11, the elastic members 40 on both sides of the first boss apply opposite forces to the first boss 11, and when the damping coupling is not subjected to an external force, the first boss 11 is located in the middle position of the first recess 311 under the combined action of the two elastic members 40, so that automatic resetting is realized.

The outer diameter of the connecting claw 30 of the present embodiment is substantially the same as the inner diameter of the second end portion 20, and the outer wall of the connecting claw 30 and the inner wall of the second end portion 20 are seamlessly attached to each other and can smoothly rotate. In the present embodiment, the oil guiding groove 14 is formed on the outer peripheral side of the first end portion 10, as shown in fig. 4 and fig. 6, the oil guiding groove 14 extends along the circumferential direction of the first end portion 10 and is communicated with the hydraulic chambers, so as to facilitate the flow of the hydraulic oil in each hydraulic chamber, when the connecting claw 30 and the first end portion 10 rotate relatively, the volume of some hydraulic chambers may be reduced, the volume of some hydraulic chambers may be increased, and the hydraulic oil in the hydraulic chambers with reduced volume may enter the hydraulic chambers with increased volume through the oil guiding groove 14.

In this embodiment, the damping coupling further includes a cover plate 50, and since the first end portion 10 needs to be connected with other components, the cover plate 50 is provided with a central hole, and the diameter of the central hole is smaller than that of the first end portion 10, so that when the cover plate 50 covers the opening end of the second end portion 20, the cover plate 50 can stop the first end portion 10 from exiting the second end portion 20, thereby sealing the hydraulic pressure chamber and facilitating the connection of the first end portion 10 with other components.

In this embodiment, the damping coupler further includes a telescopic portion 60, a universal joint portion 70 and a connecting portion 80 which are connected in sequence, the telescopic portion 60 of this embodiment is provided with one, and the universal joint portion 70 and the connecting portion 80 are both provided with two, wherein the telescopic portion 60, the universal joint portion 70 and the connecting portion 80 are sequentially provided on one side of the first end portion 10 away from the second end portion 20, and the universal joint portion 70 and the connecting portion 80 are sequentially provided on one side of the second end portion 20 away from the first end portion 10, so that the connection between the damping coupler and the external device is realized.

As shown in fig. 9, the telescopic portion 60 includes a telescopic shaft sleeve 61 and a telescopic shaft 62, the telescopic shaft sleeve 61 is connected to the end surface of the first end portion 10 far from the second end portion 20, or may be disposed on the end surface of the second end portion 20 far from the first end portion 10, and the cover plate 50 is sleeved on the outer side of the telescopic shaft sleeve 61; the telescopic shaft 62 is connected with the universal joint part 70 and is arranged in the telescopic shaft sleeve 61 in a penetrating mode, the telescopic shaft sleeve 61 can move axially, the overall length of the damping coupler can be adjusted by adjusting the axial position relation between the telescopic shaft 62 and the telescopic shaft sleeve 61, and therefore the length of the damping coupler is matched with the installation requirement.

Optionally, splines are arranged on the inner wall of the telescopic shaft sleeve 61 and the outer wall of the telescopic shaft 62, and the splines on the telescopic shaft sleeve 61 and the splines on the telescopic shaft 62 are engaged with each other, so that the telescopic shaft sleeve 61 and the telescopic shaft 62 can only move axially relative to each other through the engagement between the splines, and the splines and the telescopic shaft 62 rotate synchronously in the circumferential direction.

As shown in fig. 10, the universal joint portion 70 includes a main fork 71, an auxiliary fork 72, a fork joint 73 and a bearing 74, the main fork 71 of one universal joint portion 70 is connected with the telescopic shaft 62 of the telescopic portion 60, the main fork 71 of the other universal joint portion 70 is connected with the second end portion 20, two opposite sides of the main fork 71 are provided with through holes, two opposite sides of the auxiliary fork 72 are also provided with through holes, the fork joint 73 is a cross fork, four shafts of the cross fork respectively extend into the four through holes, so that the main fork 71 and the auxiliary fork 72 are connected, and the four shafts of the cross fork are further sleeved with the bearing 74.

The connection portion 80 of this embodiment is a flange, and the flange is connected to the secondary fork 72.

It should be noted that, a plurality in the above embodiments means at least two.

From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects:

1. the problem that in the prior art, the hard link between the automobile motor and the axle is easy to damage is solved;

2. the damping characteristic is utilized to eliminate the resonant frequency interval, thereby eliminating abnormal sound;

3. the hydraulic cavity is arranged, so that the second end part and the second end part respectively have a certain independent moving area, and the damage of hard impact to the second end part and the second end part is avoided;

4. the lateral part of the second end can reduce the risk of leakage of hydraulic oil;

5. the connecting claw is detachably arranged, so that the connecting claw is more convenient to install between the first end part and the second end part;

6. the arrangement of the telescopic portion, the universal joint portion and the connecting portion facilitates connection of the damping coupler and external equipment.

It is obvious that the above described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or described herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A damping coupling, comprising:

a first end portion (10), an end face of the first end portion (10) having a first boss (11);

a second end part (20), wherein the second end part (20) is in a sleeve shape with one open end, the inner end surface of the second end part (20) is provided with a second boss (21), and at least one part of the first end part (10) can extend into the second end part (20);

the connecting claw (30) is arranged between the first end part (10) and the second end part (20) and is provided with a connecting concave part (31), the second boss (21) extends into the connecting concave part (31) and is in contact fit with two sides of the connecting concave part (31), the second end part (20) and the connecting claw (30) rotate synchronously, and the first boss (11) extends into the connecting concave part (31) and is in clearance fit with the side wall of the connecting concave part (31) to form a hydraulic cavity;

the elastic piece (40) is arranged in the hydraulic cavity, two ends of the elastic piece (40) are respectively abutted to the side wall of the connecting concave part (31) and the side wall of the first boss (11), and elastic force moving towards the direction away from each other is provided for the side wall of the connecting concave part (31) and the side wall of the first boss (11).

2. The damping coupling according to claim 1, characterized in that the connecting recess (31) comprises a first recess (311) and a second recess (312) which are axially aligned, the first boss (11) extends into the first recess (311), both ends of the elastic member (40) abut against the first boss (11) and the first recess (311), respectively, the second boss (21) extends into the second recess (312), and in the circumferential direction of the connecting claw (30), the arc length on both sides of the first recess (311) is greater than the arc length on both sides of the second recess (312).

3. The damping coupling according to claim 1, characterized in that the first bosses (11) are fan-shaped and are multiple, and each first boss (11) is arranged at intervals along the circumference of the first end portion (10); and/or the second bosses (21) are fan-shaped and are multiple, and the second bosses (21) are arranged at intervals along the circumferential direction of the second end part (20).

4. Damping coupling according to claim 1, characterized in that the first end part (10) and the second end part (20) are formed with a limiting groove (12) in the middle, and the connecting claw (30) is formed with a limiting groove (12) in the middle, which extends into the limiting groove (12) and rotates in the limiting groove (12).

5. Damping coupling according to claim 1, characterized in that the side walls of the first boss (11) and the connecting recess (31) each have a mounting hole (13), the elastic member (40) is received in the mounting hole (13), and the sum of the depths of the two mounting holes (13) is greater than the minimum length of the elastic member (40).

6. Damping coupling according to claim 1, characterized in that said elastic element (40) is in plurality and that between said connection recess (31) and the adjacent sides of said first boss (11) there is provided at least one said elastic element (40).

7. Damping coupling according to claim 1, characterized in that the outer circumferential side of the first end part (10) is provided with an oil guiding groove (14), which oil guiding groove (14) extends in the circumferential direction of the first end part (10) and communicates with the hydraulic chamber.

8. The damping coupling according to claim 1, characterized in that it further comprises a cover plate (50), said cover plate (50) covering the open end of said second end portion (20) and stopping said first end portion (10) from exiting said second end portion (20).

9. Damping coupling according to claim 1, characterized in that it further comprises a telescopic part (60), a gimbal part (70) and a connection part (80) connected in sequence, said telescopic part (60) being connected with said first end (10) or said second end (20), said connection part (80) being connected with an external device.

10. Damping coupling according to claim 9, characterized in that the bellows (60) comprises:

a telescopic shaft sleeve (61), said telescopic shaft sleeve (61) being connected to said first end (10) or said second end (20);

the telescopic shaft (62) is connected with the universal joint part (70), penetrates through the telescopic shaft sleeve (61), and can axially move relative to the telescopic shaft sleeve (61).

11. Damping coupling according to claim 10, characterized in that the inner wall of the telescopic shaft sleeve (61) and the outer wall of the telescopic shaft (62) are provided with splines, and the splines engage with each other to make the telescopic shaft sleeve (61) and the telescopic shaft (62) rotate synchronously.

12. Damping coupling according to claim 9, characterized in that the universal joint part (70) comprises:

a main fork (71), wherein the main fork (71) is connected with the telescopic part (60);

a sub fork (72);

a fork joint (73), wherein the fork joint (73) extends into the through holes of the main fork (71) and the auxiliary fork (72) and connects the main fork (71) and the auxiliary fork (72);

the bearing (74), bearing (74) cover is established on the axle of fork festival (73).