阅读说明：本技术 一种联轴器和调节其刚度的方法 (Coupling and method for adjusting rigidity thereof ) 是由 伍保华 胡伟辉 刘文松 秦中正 彭浩坤 陆响 于 2019-07-26 设计创作，主要内容包括：本发明提出了一种轨道车辆用联轴器和调节其刚度的方法,该联轴器包括两个相对式设置的弹性体连接装置,各弹性体连接装置具有星形架,且星形架具有星形架主体和与星形架主体固定连接的周向间隔设置的多个第一臂端凸台,在第一臂端凸台上对应式设置有扇状的周向间隔的弹性元件,该联轴器的结构非常紧凑,可靠性高,安装维护也非常的便利。(The invention provides a coupler for a railway vehicle and a method for adjusting the rigidity of the coupler, wherein the coupler comprises two elastomer connecting devices which are oppositely arranged, each elastomer connecting device is provided with a star frame, the star frame is provided with a star frame main body and a plurality of first arm end bosses which are fixedly connected with the star frame main body and are circumferentially arranged at intervals, and fan-shaped elastic elements which are circumferentially arranged at intervals are correspondingly arranged on the first arm end bosses.)

1. The coupler is characterized by comprising two elastomer connecting devices which are oppositely arranged, each elastomer connecting device is provided with a star frame, each star frame is provided with a star frame main body and a plurality of first arm end bosses which are fixedly connected with the star frame main body and are circumferentially arranged at intervals, and fan-shaped elastic elements which are circumferentially arranged at intervals are correspondingly arranged on the first arm end bosses.

2. The coupling according to claim 1, wherein the elastic member includes a middle block, elastic pieces respectively provided on both sides of the middle block in a circumferential direction, and end plates provided on outer sides of the elastic pieces in the circumferential direction, wherein the middle block is provided on an outer side in an axial direction thereof with a first groove for insertion of the first arm end boss.

3. The coupling of claim 2 wherein said intermediate block is bolted to said first arm end boss at the location of said first groove.

4. a coupling according to claim 2 or 3, wherein a spider is coaxially arranged axially inwardly of the spider, a plurality of second arm end bosses are circumferentially spaced on an outer wall of the spider, and a securing block is arranged on each of the second arm end bosses and is radially extendable between and connectable to adjacent ones of the resilient elements.

5. A coupling according to claim 4 wherein said spider is telescopically connected to said spider.

6. A coupling according to claim 4 or 5, wherein adjacent first arm end bosses are connected by a concave curve and the second arm end bosses axially project into the concave curve.

7. the coupling according to any one of claims 4 to 6, wherein six of the first arm end bosses and the second arm end bosses are provided circumferentially evenly one each, and the second arm end boss is located intermediate two adjacent first arm end bosses.

8. a coupling according to any one of claims 4 to 7, wherein first step surfaces are provided on both circumferential sides of the fixed block, respectively, so that a cross-sectional area of the fixed block at a radially outer side is reduced, and second step surfaces are provided on the end plate for engagement with the respective first step surfaces.

9. A coupling according to any one of claims 4 to 8, wherein a second groove is provided on a radially inner end surface of the fixing block to cooperate with a first positioning projection provided on the second arm end boss.

10. The coupling according to any one of claims 4 to 9, wherein a gap is provided between a radially inner end surface of the fixed block and a radially outer end surface of the second arm end boss, and a regulating washer for regulating a size of the gap is selectively provided at the gap.

11. The coupling according to any one of claims 4 to 10, wherein a pressing piece is provided at a radially outer end of the fixing piece, both sides of which can be lapped on the end plate, and the fixing piece is connected to the second arm end boss after passing through the pressing piece and the fixing piece by a bolt.

12. A coupling according to any one of claim 11, wherein there is a male-female fit between the compression plate and the respective anchor block or the respective end plate.

13. A coupling according to any one of claims 4 to 12, further comprising an axially extending connecting shaft for connecting the elastomer connecting means, wherein one end of the connecting shaft is an input end and first connecting teeth are provided on an axially inner wall surface of the spider at the end, the other end of the connecting shaft is an output end and second connecting teeth are provided on an axially outer wall surface of the spider at the end.

14. The coupling of claim 13 wherein said star disc at the output end is an integral member with said connecting shaft.

15. A coupling according to claim 14 or 15, wherein there is an angular difference in the circumferential direction between the two elastomeric connecting means.

16. a method of adjusting the stiffness of a coupling according to any one of claims 1 to 15, characterized in that the amount of radial deformation of the resilient members of the resilient elements is adjustable by setting a gap.

Technical Field

The invention relates to the technical field of locomotive vehicle transmission systems, in particular to a coupler for a rail vehicle and a method for adjusting the rigidity of the coupler.

Background

in mechanical systems, different mechanical transmission devices require certain components to be connected in order to transmit motion and torque backwards.

The coupler has good displacement compensation performance and vibration and noise reduction capability in a mechanical system, and is often widely applied to connection of mechanical transmission equipment in industries such as vehicles, ships, cranes, chemical engineering, logistics and the like. Particularly in the field of rail transit, the requirements on a locomotive vehicle transmission system are extremely high, the size of a transmission space is strictly limited, and as a key component of the transmission system, a locomotive coupler is required to be capable of improving and optimizing axial vibration frequency, reducing vibration amplitude, compensating axial space for displacement and reducing noise.

The traditional rigid coupling or the large-size elastic coupling can not meet the development requirement of the rail transit vehicle. Therefore, the invention is necessary to provide a coupling with compact structure space, high reliability and convenient installation and maintenance.

Disclosure of Invention

The present invention is directed to a coupling and a method of adjusting the stiffness thereof that addresses some or all of the above-mentioned problems with the prior art. The coupler is very compact in structure, high in reliability and very convenient to install and maintain.

According to an aspect of the present invention, a coupling is provided, comprising two elastomer connecting devices arranged oppositely, each elastomer connecting device having a spider frame with a spider frame body and a plurality of circumferentially spaced first arm end bosses fixedly connected to the spider frame body, wherein the first arm end bosses are correspondingly provided with fan-shaped circumferentially spaced elastic elements.

In one embodiment, the elastic element includes a middle block, elastic pieces respectively provided on both sides of the middle block in the circumferential direction, and an end plate provided on the outer side of each elastic piece in the circumferential direction, wherein the outer side of the middle block in the axial direction is provided with a first groove for insertion of the first arm end boss.

In one embodiment, the intermediate block is bolted to the first arm end boss at the location of the first groove.

in one embodiment, a spider is coaxially disposed axially inward of the spider, a plurality of second arm end bosses are circumferentially spaced on an outer wall of the spider, and a securing block is disposed on each second arm end boss and is capable of extending radially between and connecting adjacent ones of the resilient members.

in one embodiment, the spider is connected to the spider in a telescoping configuration.

in one embodiment, adjacent first arm end bosses are connected by a concave curved surface and second arm end bosses project axially into the concave curved surface.

In one embodiment, six first arm end bosses and six second arm end bosses are uniformly arranged in the circumferential direction, and each second arm end boss is located between two adjacent first arm end bosses.

In one embodiment, first step surfaces are respectively arranged at two circumferential sides of the fixed block so that the cross-sectional area of the fixed block at the radial outer side is reduced, and second step surfaces are arranged on the end plate and used for being matched with the corresponding first step surfaces.

In one embodiment, a second groove is provided on a radially inner end surface of the fixing block to mate with a first positioning projection provided on the second arm end boss.

In one embodiment, a gap is provided between the radially inner end surface of the fixed block and the radially outer end surface of the second arm end boss, and an adjustment washer for adjusting the size of the gap is selectively provided at the gap.

In one embodiment, a pressing sheet is arranged at the radial outer end of the fixing block, two sides of the pressing sheet can be lapped on the end plate, and the pressing sheet and the fixing block are connected to the second arm end boss after penetrating through the pressing sheet and the fixing block through bolts.

In one embodiment, there is a male-female fit between the compression tabs and the respective anchor blocks or the respective end plates.

In one embodiment, the elastic body connecting device further comprises an axially extending connecting shaft for connecting the elastic body connecting device, wherein one end of the connecting shaft is an input end, a first connecting tooth is arranged on the axial inner wall surface of the star-shaped disc at the end, the other end of the connecting shaft is an output end, and a second connecting tooth is arranged on the axial outer wall surface of the star-shaped frame at the end.

in one embodiment, the star-shaped disk at the output end is an integral member with the connecting shaft.

In one embodiment, the two elastomeric coupling devices are circumferentially angularly offset.

According to another aspect of the present invention, there is provided a method of adjusting the stiffness of the coupling described above by setting a gap to enable adjustment of the amount of radial deformation of the resilient members of the resilient elements.

Compared with the prior art, the shaft coupling has the advantages that due to the existence of the elastic element, the displacement can be well compensated, the proper flexibility is provided in the torsion direction, the torsion vibration of the shaft system puncture torque is eliminated, and the stable running of a vehicle is ensured. Furthermore, the elastic elements of the coupling are arranged through the star frame and distributed at intervals in the circumferential direction, so that the coupling is reasonable in layout and compact in structure. In addition, corresponding elastic elements are fixed through the first arm end bosses of the star frame and are divided into blocks, so that the installation is convenient due to the independence of the elastic elements, and the later maintenance and replacement are facilitated.

Drawings

Preferred embodiments of the present invention will be described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 shows a perspective view of a coupling according to an embodiment of the invention;

FIG. 2 shows an axial cross-section of a coupling according to an embodiment of the invention;

FIG. 3 shows an input spider according to one embodiment of the present invention;

FIG. 4a shows a spring element according to an embodiment of the invention;

FIG. 4b shows a spring element according to another embodiment of the invention;

FIG. 5 shows a star disk according to one embodiment of the present invention;

FIG. 6 shows a perspective view of a portion of the components of a coupling according to one embodiment of the present invention;

FIG. 7a shows a fixed block according to one embodiment of the invention;

FIG. 7b shows a fixed block according to another embodiment of the invention;

FIG. 8 shows a schematic view of the mounting of a mounting block according to one embodiment of the invention;

FIG. 9 shows an output spider according to one embodiment of the present invention;

FIG. 10 shows a connecting shaft according to an embodiment of the invention;

FIG. 11 shows a left side view of an embodiment in accordance with the invention;

Figure 12 shows a compression tab according to one embodiment of the present invention.

in the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.

Detailed Description

The invention will be further explained with reference to the drawings.

Fig. 1 and 2 show a coupling 100 according to an embodiment of the invention. As shown in fig. 1 and 2, the coupling 100 includes two elastomeric coupling devices 90, and the two elastomeric coupling devices 90 are oppositely disposed. Specifically, each elastomer connection device 90 has a spider 1. As shown in fig. 3, the spider 1 has a spider body 11 and a plurality of first arm end bosses 12. The spider body 11 is cylindrical. The first arm end boss 12 is fixedly connected to the spider body 11 and extends radially outward. A plurality of first arm end bosses 12 are circumferentially spaced. The first arm end bosses 12 are correspondingly provided with fan-shaped elastic elements 2, and a plurality of elastic elements are circumferentially spaced.

Therefore, the coupling 100 has the elastic element 2, so that displacement can be well compensated, proper flexibility is provided in the torsion direction, the torsional vibration of shafting puncture torque is eliminated, and the stable running of a vehicle is ensured. And, elastic element 2 sets up and distributes in circumference through star frame 1 for rationally distributed, compact structure. In addition, the corresponding elastic elements 2 are fixed through the plurality of first arm end bosses 12 of the star frame 1, so that the elastic elements 2 are divided into blocks, installation and replacement are convenient, and parts in the elastic elements can be replaced in later maintenance to save cost.

In a specific embodiment, as shown in fig. 4a, the elastic member 2 includes a middle block 21, elastic pieces 22 respectively provided on both sides of the middle block 21 in the circumferential direction, and end plates 23 provided on the outer sides of the respective elastic pieces 22 in the circumferential direction. Wherein the axially outer side of the intermediate block 21 is provided with a first groove 24. During installation, the first arm end boss 12 can be radially inserted into the first recess 24. Meanwhile, the first arm end boss 12 is provided with a third step surface 13 for positioning the intermediate block 21, as shown in fig. 3. The elastic element 2 with the structure can better play a role in vibration reduction and buffering, so that the rigidity performance of the coupler in the radial direction and the transverse direction is matched, the displacement can be well supplemented, the proper flexibility is provided in the torsion direction, the torsion vibration of shafting puncture torque is eliminated, and the stable running of a vehicle is ensured. The connection mode of the elastic element 2 and the star frame 1 can ensure good positioning of the elastic element 2 and the first arm end boss 12, simplify installation operation, greatly improve the stress state of the bolt 14 (detailed later) and prolong service life. In order to increase the rigidity of the spring element 2, a spacer 25 can be inserted into the spring element 22. For example, the intermediate block 21, the elastic member 22, the end plate 23 and the partition plate 25 may be disposed together by vulcanization. This arrangement can increase the rigidity of the elastic member 2, and the number of the partition plates 25 to be arranged can be selected according to the actual situation.

As shown in fig. 6, at the position of the first groove 24, the intermediate block 21 of the elastic member 2 and the first arm end boss 12 are connected by the bolt 14. The connecting bolt 14 here extends axially through the intermediate block 21 and the first arm end boss 12 for connection. The connecting mode is simple, the installation and the disassembly are easy, and the connection can be completed without other tool equipment.

As shown in fig. 1, a spider 3 is coaxially provided inside the spider 1. As shown in fig. 5, the star disk 3 itself has a cylindrical shape. And a plurality of second arm end bosses 31 are provided circumferentially at intervals on the outer wall of the spider 3. A fixing block 4 is provided on the outer wall of each second arm end boss 31. The fixing blocks 4 can extend radially between adjacent elastic elements 2 and be connected to the elastic elements 2. The mode of utilizing the fixed block 4 to connect the elastic elements 2 on the two sides in the circumferential direction enables the operation to be simple and convenient, and the operations such as installation and disassembly can be realized without the help of a tool.

In particular, the spider 1 is connected with the spider 3 in a telescopic structure. For example, as shown in fig. 3 and 5, respectively, a connection sleeve 15 axially protrudes from the spider body 11 of the spider 1 to match the inner bore of the spider 3, so that the spider 1 and the spider 3 are partially connected in a sleeved manner. The connection relation is simple and easy to realize, and the coaxial requirement between the two can be well ensured.

as shown in fig. 3, adjacent first arm end bosses 12 are connected by a concave curved surface 16. This arrangement contributes to reducing automation and reducing weight. On the other hand, a space for compensation of the twisting direction of the coupling 100 can be provided. As shown in fig. 5, the second arm end boss 31 axially protrudes and can extend into the concave curved surface 16. The second arm end bosses 31 and the first arm end bosses 12 are arranged in a staggered mode, so that the axial space of the concave curved surface 16 is better utilized, the structure is more compact, and the novel telescopic arm is suitable for being installed in a vehicle transmission system. Fig. 9 also shows a spider 1, similar in construction to the spider 1 shown in fig. 3, but with some adaptations for connection to other components.

In the preferred embodiment, six first arm end bosses 12 and six second arm end bosses 31 are provided circumferentially uniformly each. And the second arm end boss 31 is located intermediate two adjacent first arm end bosses 12. For example, the second arm end boss 31 is at an angle of 30 degrees to the adjacent first arm end boss 12. The uniformly arranged elastomer connecting device 90 can better improve the stress balance and is helpful for maintaining the overall dynamic balance of the coupling 100.

First step surfaces 41 are provided on both sides of the fixed block 4 in the circumferential direction, respectively, so that the sectional area of the fixed block 4 on the radially outer side is reduced, as shown in fig. 7 a. Correspondingly, the end plate 23 is configured in a "7" shape, i.e. provided with a second step surface 26, as shown in fig. 4 a. Meanwhile, a second groove 42 is provided on a radially inner end surface of the fixed block 4. Correspondingly, a first positioning projection 311 is provided on the second arm end boss 31 to mate with the second groove 42. During mounting, the fixing blocks 4 are inserted into the gaps between the elastic elements 2. Meanwhile, the second groove 42 on the radially inner end surface of the fixed block 4 is snapped onto the first positioning projection 311, and the first step surface 41 is opposed to the second step surface 26.

In a more preferred embodiment, fifth step surfaces 44 are further provided on both axial sides of the fixed block 4, so that the cross-sectional area of the fixed block 4 on the radially inner side is reduced, as shown in fig. 7 b. That is, the sectional area of the radially middle of the fixing block 4 is larger than the sectional areas of both ends. Correspondingly, the end plate 23 is configured in a plate-like manner and is provided with axially extending recesses on the circumferential outer wall surface. That is, a sixth step surface 27 is also provided on the end plate 23 so as to oppose the second step surface 26. During mounting, the fixing block 4 is fitted into the gap of the elastic member 2, with the first step surface 41 facing the second step surface 26 and the fifth step surface 44 facing the sixth step surface 27. This arrangement facilitates the mounting of the fixing block 4 and, in addition, better ensures the clearance 5, thereby facilitating the setting of the adjusting shim 6 (mentioned later). Further, the first step surface 41 and the second step surface 26, and the fifth step surface 44 and the sixth step surface 27 are provided with a ratchet-like snap structure (indicated by reference numeral 28 in fig. 4b and reference numeral 45 in fig. 7 b) to define the position between the fixing block 4 and the end plate 23, and to help to maintain stability therebetween, particularly during forced twisting.

A gap 5 is provided between the radially inner end surface of the fixed block 4 and the radially outer end surface of the second arm end boss 31. It should be noted that, if the fixed block 4 is arranged as shown in fig. 7b and the elastic member 2 is arranged as shown in fig. 4b, after the fixed block 4 is interposed between the elastic members 2, the radially inner end surface of the fixed block 4 is spaced from the radially outer end surface of the second arm end boss 31 to form the gap 5, which is easy to understand; whereas if the fixing block 4 is arranged as shown in fig. 7a and the elastic member 2 is arranged as shown in fig. 4a, after the fixing block 4 is interposed between the elastic members 2, the radially inner end surface of the fixing block 4 may contact the radially outer end surface of the second arm end boss 31, but the fixing block 4 may be radially moved such that the radially inner end surface of the fixing block 4 is spaced apart from the radially outer end surface of the second arm end boss 31 by a distance which also belongs to the gap 5. That is, the fixing block is fitted between the two elastic members 2 so that, for example, the spacer 6 or the like may be inserted between the fixing block 4 and the second arm end boss 31 to form the gap 5. In addition, a regulating shim 6 for regulating the size of the gap 5 is selectively provided at the gap 5, as shown in fig. 11. By this arrangement, the size of the gap 5 can be adjusted, and the force applied by the elastic member 22 can be adjusted, so that the rigidity of the coupling 100 can be adjusted.

as shown in fig. 8, a pressing piece 7 having both ends capable of being lapped on the end plate 23 is provided on the radially outer side of the fixing block 4. The bolt 14' penetrates through the pressing sheet 7 and the fixing block 4 and then is fixedly connected with the second arm end boss 31. That is, the pressing piece 7, the fixing block 4, and the second arm end boss 31 are fixed together by the bolt 14'. For example, as shown in fig. 4a and 12, respectively, a second positioning projection 231 may be provided on the end plate 23 to cooperate with the positioning hole 71 provided on the pressing piece 7. Meanwhile, a notch 72 is arranged on the pressing sheet 7 to be clamped with the protruding positioning strip 43 arranged on the fixed block 4. The arrangement facilitates the installation and positioning of the pressing sheet 7 and defines the positions of the pressing sheets after the installation is completed. The shape of the second positioning protrusion 231 may be changed according to actual needs, and may be, for example, a cylindrical shape or a square-cylindrical shape.

In the matching and connecting structure of the fixed block 4 and other components, not only is the mounting and positioning operation easy, but also a force locking relation can be formed in the matching, and the stress state of the structure can be greatly improved.

As further shown in fig. 1 and 2, the coupling 100 further includes an axially extending coupling shaft 8 for coupling to the elastomeric coupling device 90. One end of the connecting shaft 8 is an input end (a right end in fig. 1, and a left end in fig. 2), and a first connecting tooth 32 is provided on an axial inner wall surface of the star-shaped disk 3 at the end. The other end of the connecting shaft 8 is an output end, and the axial outer wall surface of the star frame 1 at the end is provided with a second connecting tooth 17. In use, the input is connected to the gearbox 80. And the output is connected to the axle 70. The power is transmitted from the gear box, and is transmitted to the elastic element 2 and the fixed block 4 at the input end through the star-shaped disc 3 at the input end. Because the elastic element 2 is fixedly connected with the input end star frame 1, the power is transmitted to the connecting shaft 8 through the input end star frame 1. The connecting shaft 8 transmits power to the elastic member 2 through the output side spider 3 and the fixed block 4, and the power is transmitted to the axle 70 through the output side spider 1 since the elastic member 2 is connected to the output side spider 1. Due to the existence of the elastic element 2, the coupler 100 can compensate displacement, provide proper flexibility in the torsional direction, eliminate torsional vibration transmitted by a shafting and ensure stable and low-noise running of a vehicle. In addition, the first connecting teeth 32 and the second connecting teeth 17 are arranged to realize a tooth connection form with other parts, so that the disassembly and maintenance are convenient.

Preferably, the star-shaped disk 3 at the output end and the connecting shaft 8 may be an integral member, as shown in fig. 10. The connection mode is simple and easy to realize. In addition, an angular difference is provided between the two elastomer couplings 90, which may be configured, for example, in the case of the above-described construction, as 30 degrees, with the first arm end projection 12 of one elastomer coupling 90 corresponding exactly to the second arm end projection 31 of the other elastomer coupling 90. This arrangement improves the overall dynamic balance of the coupling 100.

The installation of the coupling 100 and the method of adjusting the stiffness are described in detail below with respect to fig. 1-12.

The elastomer connecting device 90 at the input end is firstly installed, and the star-shaped frame 1 and the star-shaped disc 3 are firstly connected together according to the requirements of coaxial and arm end staggered installation. The separate mounting of the elastic element 2 is then carried out, the elastic element 2 is arranged on the respective spider 1 such that the first recess 24 cooperates with the first arm end boss 12 and the elastic element 2 is fixed to the spider 1 by means of the bolt 14. Then, the fixing block 4 is axially pushed and enters the space between the adjacent elastic elements 2, so that the fixing block 4 is disposed on the second arm end boss 31 and the second groove 42 is ensured to be engaged with the first positioning projection 311. Next, the pressing piece 7 is placed, and the bolt 14' penetrates through the pressing piece 7 and the fixing block 4 to be connected with the second arm end boss 31. The fixing block 4, the elastic element 2 and the second arm end boss 31 have equal widths in the axial direction, so as to ensure that the axial outer wall surface of the elastic body connecting device 90 is neat. When the screw bolt 14' is screwed into the threaded hole of the boss 31 of the second arm end of the connecting star-shaped disc 3, the end plate 23 of the elastic element 2 moves radially at the moment, and when the end plate 23 and the fixed block 4 cannot move radially further and fit well, the prepressing of the elastic element 2 is completed, and at the moment, the elastic element 22 is in a compression state, which is beneficial to providing the product rigidity of the coupling 100 and the fatigue life of the elastic element.

And then the star-shaped disc 3 on the connecting shaft 8 is connected with the star-shaped frame 1 at the output end by the same or similar mounting method as that described above, and the mounting of the elastic body connecting device 90 at the output end is completed. For convenience of installation, the connection relationship between the output-side spider 1 and the spider 3 may also be a partially sleeved connection.

Next, the input-side elastic body coupling device 90 and the output-side elastic body coupling device 90 are coupled to the gear case 80 and the axle 70, respectively.

Finally, the connection shaft 8 is connected through the gear box 80 to the input-side elastomer connection 90, wherein an angular difference between the input-side elastomer connection 90 and the output-side elastomer connection 90 is to be ensured.

after the elastic elements 2 are installed on the coupling 100, and the fixing block 4 is installed between the elastic elements 2, a larger gap 5 is formed radially between the fixing block 4 and the second arm end boss 31. The present coupling 100 realizes the adjustment of the rigidity by controlling the size of the gap 5. The larger the gap 5, the greater the coupling 100 preload and the greater the torsional stiffness. Therefore, at the beginning of the design, by providing rigidity adjusting spacers 6 of different thicknesses between the gaps 5, the rigidity is adjusted. For example, a preferred set of shims 6 is 4 in number, with a 3mm stack thickness, two for 0.5mm, and 1 for each 1mm shim. In a specific embodiment, the overall stiffness of the coupling 100 will be increased by 4% by calculating an increase of 0.5mm in the clearance 5. Therefore, a 3mm gap is reserved, and the phenomenon that the rigidity is smaller due to rubber creep and aging can be compensated. At the beginning of the design of the coupler 100, the fixed block 4 and the second arm end boss 31 can be adjusted well according to the rigidity clearance required by a customer, and the rigidity of the coupler 100 meets the requirement when the length is 5 mm. At the moment, the distance of the gap 5 is changed from 5mm to 8mm by processing the arm end of the second arm end boss 31, and then the rigidity adjusting gasket 6 is plugged into the gap 5, so that the distance between the lower end of the fixing block 4 and the second arm end boss 31 is restored to 5mm, and the rigidity meets the use requirement. As the coupling 100 continues to be used, the elastomer 22 rubber ages or creeps, at which point the stiffness of the coupling 100 diminishes and the vehicle vibrates. At this time, the stiffness of the coupling 100 in operation at this time is acquired through professional detection, and the stiffness change rate is obtained. The rigidity of the coupler 100 can be increased and restored to a normal rigidity value by only drawing out the rigidity adjusting gasket 6 without replacing the elastic element 2, so that the product cost and the installation and maintenance time are saved, and the service life is prolonged.

The above is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily make changes or variations within the technical scope of the present invention disclosed, and such changes or variations should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.