CN218512227U

CN218512227U - Bias torsion fatigue test device for rubber bushing

Info

Publication number: CN218512227U
Application number: CN202220943100.8U
Authority: CN
Inventors: 杨美钊
Original assignee: Boge Rubber and Plastics Zhuzhou Co Ltd
Current assignee: Boge Rubber and Plastics Zhuzhou Co Ltd
Priority date: 2022-04-22
Filing date: 2022-04-22
Publication date: 2023-02-21
Anticipated expiration: 2032-04-22

Abstract

The utility model relates to the technical field of fatigue tests of rubber vibration damping parts, in particular to a partial torsional fatigue test device of a rubber bushing, which comprises a deflection tool and a fixed tool arranged outside the deflection tool, wherein the middle part of the deflection tool is provided with a sleeved inner hole for accommodating the rubber bushing, and an outer sleeve of the rubber bushing is attached to the hole wall of the sleeved inner hole; the deflection tool comprises deflection inclined tables symmetrically arranged at two sides of the sleeved inner hole, and the fixing tool comprises a press mounting table which is arranged corresponding to the deflection inclined tables and can flatten the deflection inclined tables to fix the deflection angle of the rubber bushing; a locking connecting rod penetrates through an inner sleeve of the rubber bushing, and a torsion driving piece capable of driving the rubber bushing to be loaded in a torsion mode is arranged at the end portion of the locking connecting rod. The utility model discloses a deflection frock and a torsion drive spare can realize deflecting and twist reverse fatigue test, device simple structure.

Description

Bias torsion fatigue test device for rubber bushing

Technical Field

The utility model relates to a rubber bush's torsion fatigue test device partially belongs to rubber damping piece fatigue test technical field.

Background

The rubber bushing is an elastic body formed by vulcanizing a rubber body and a metal piece at high temperature and high pressure, has the functions of flexible connection and vibration buffering, can bear the fatigue action and instantaneous impact from multidirectional loads such as axial load, radial load, torsion load, deflection load and the like in a complex working environment, plays the roles of vibration damping and noise reduction, is widely applied to the ends of vibration dampers or connecting rod/swing arm ends in rail vehicles, automobiles and various engineering machinery, realizes the composite deformation of radial load, axial load, deflection load and torsion load similar to joint movement while realizing the force transmission and reliable connection through the elastic deformation of the rubber body, and plays the roles of flexible connection, vibration damping and impact resistance.

Under certain working conditions, the deflection and torsion performance of the rubber bushing are high in requirement, and based on the characteristics of the rubber bushing, certain reliability is required during the use process of the rubber bushing, so that the damage condition or the rigidity attenuation condition of the rubber bushing is controlled within a certain range when the rubber bushing bears the deflection torsion load or deformation. Therefore, a fatigue testing device is required to detect the partial torsional fatigue performance of the rubber bushing.

At present, a universal test device for a rubber bushing or a rubber joint carries out reciprocating loading through a controllable loading oil cylinder and a certain test fixture. Generally speaking, the deflection and torsion loading directions respectively need one actuating oil cylinder, and motion decoupling and compounding are carried out on a test tool through the action of the two actuating oil cylinders. The existing test device mainly has the following problems:

1. two oil cylinders are needed to respectively carry out deflection loading and torsion loading on the rubber bushing, the demand of test resources is large, and the test structure is complex.

2. The existing loading device can only carry out fatigue test on one rubber bushing at one time, has low test efficiency, and is difficult to carry out fixed-angle deflection and dynamic-angle torsion fatigue test on a plurality of rubber bushings at the same time.

In summary, how to design a testing device which has a simple structure and can simultaneously perform a fixed angle deflection and a dynamic angle torsion fatigue loading test on a plurality of rubber bushings is a problem which needs to be solved at present.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a rubber bush twist reverse fatigue test device partially, the deflection angle of rubber bush is injectd through the frock that deflects, and the rethread twists reverse the rubber bush that the driving piece drive has injectd the deflection angle and twists reverse the loading to this twists reverse fatigue test partially to rubber bush, test device simple structure, and the loading is efficient.

In order to achieve the above object, the utility model provides a following technical scheme: a bias torsion fatigue test device for a rubber bushing comprises a deflection tool and a fixing tool oppositely arranged on the outer side of the deflection tool, wherein a sleeving inner hole for accommodating the rubber bushing is formed in the middle of the deflection tool, and an outer sleeve of the rubber bushing is attached to the hole wall of the sleeving inner hole; the deflection tool comprises deflection inclined tables symmetrically arranged at two sides of the sleeved inner hole, and the fixing tool comprises a press mounting table which is arranged corresponding to the deflection inclined tables and can flatten the deflection inclined tables to fix the deflection angle of the rubber bushing; a locking connecting rod penetrates through an inner sleeve of the rubber bushing, and a torsion driving piece capable of driving the rubber bushing to be loaded in a torsion mode is arranged at the end portion of the locking connecting rod.

Preferably, the two deflection inclined platforms are symmetrically arranged, and the distance between the two deflection inclined platforms is S1 when the two deflection inclined platforms are deflected to the position parallel to the horizontal line according to the same deflection angle; two pressure equipment platforms are the symmetry and set up, and after two fixed frocks were to the dress, distance S2= S1 between two pressure equipment platforms.

Preferably, the two deflection inclined tables of the deflection tool are provided with cross sections parallel to the central axis L of the rubber bushing, and the cross sections are of parallelogram structures.

Preferably, the deflection tool is of a parallel quadrilateral body structure or a cylindrical structure with two end faces of a deflection sloping platform.

Preferably, bearing assemblies sleeved on the locking connecting rods are arranged on two sides of the rubber bushing, and a bearing mounting groove for fixing a bearing seat in the bearing assembly is formed in the fixing tool; the central axis defining the rubber bushing by the bearing assembly remains fixed to improve stability to torsional loading.

Preferably, an anti-slip gasket sleeved on the locking connecting rod is arranged between the rubber bushing and the bearing seat, and a locking sleeve sleeved on the locking connecting rod is arranged on the outer side of the bearing seat.

Preferably, a locking nut is arranged on the outer side of the locking sleeve, a swing arm for driving the rubber bushing to perform torsional loading is connected to the power output end of the torsional driving piece, and the swing arm is fixed between the locking nut and the locking sleeve at one side end of the locking connecting rod.

Preferably, in a cross-section of the parallelogram structure, the obtuse angle is divided by the diagonal d1 of the two obtuse angles of the parallelogram into two angles x and y, where x and y are both smaller than 90 °.

Preferably, a plurality of rubber bushings sleeved on the locking connecting rod are arranged between the bearing seats, and anti-skidding gaskets are arranged between the adjacent rubber bushings; and a deflection tool is matched and arranged on each rubber bushing.

Preferably, the shape, size or inclined angle of the deflection inclined table of the deflection tool on the plurality of rubber bushings can be the same or different.

Has the beneficial effects that:

1. the utility model discloses a deflection frock and fixed frock cooperate and carry out the angle of deciding of rubber bush and deflect the loading, for the test bench that deflects that the structure is complicated among the prior art, the simple structure of frock and fixed frock deflects, and the dismouting is convenient, and the deflection angle requirement according to the different rubber bush of operating condition adaptation that can be easier. After the deflection angle is fixed, the rubber bushing is driven by the torsion driving piece to perform angle torsion loading.

2. The utility model discloses can twist reverse the loading partially to a plurality of rubber bush simultaneously.

3. The utility model discloses in the cross section of well parallelogram structure, two obtuse diagonal d1 of parallelogram divide into two contained angles x and y with the obtuse angle, wherein x and y all are less than 90 to this ensures the application of force of the tight frock of rubber bush's the sloping platform accessible that deflects and is spacing in the position department parallel with the horizontal plane by the full degree of freedom.

4. The utility model provides a bearing assembly can support rubber bush and inject rubber bush and carry out fatigue test on the central axis L, prevents the in-process of load test, and rubber bush and relevant part can skew central axis L to the proof test effect.

Drawings

FIG. 1 is a schematic diagram of a testing apparatus according to an embodiment.

Fig. 2 is a left side view of fig. 1.

Fig. 3 isbase:Sub>A cross-sectional view taken along the linebase:Sub>A-base:Sub>A in fig. 2 (with the two-piece fixation sleeve not in alignment).

Fig. 4 isbase:Sub>A cross-sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2 (with the two-piece fastener sleeve mated).

Fig. 5 is a schematic structural diagram of a deflection tool in the first embodiment.

Fig. 6 is a first schematic cross-sectional view of two deflection ramps in the deflection tool of the first embodiment (the deflection ramp 201 has been pressed parallel to the horizontal plane by two flaps of the securing sleeve 301).

FIG. 7 is a schematic structural diagram of a second embodiment of the testing apparatus.

Fig. 8 is a front view of fig. 7 (with the two-piece fastener sleeve assembled).

Fig. 9 is a cross-sectional view taken along line B-B of fig. 8 (with the two-piece fixation sleeve not in alignment).

Description of the reference numerals:

1. a rubber bushing; 101. a jacket; 102. an inner sleeve; 103. a rubber vulcanizate; 2. a deflection tool; 201. a deflection ramp; 202. sleeving an inner hole; 301. fixing a sleeve; 302. a press mounting table; 303. a bearing mounting groove; 4. a cross-section; 5. an inscribed circle; 6. locking the connecting rod; 7. an anti-slip gasket; 8. a bearing assembly; 9. a locking sleeve; 10. locking the nut; 11. and (4) swinging arms.

Detailed Description

The present invention is described in further detail below with reference to fig. 1-9. The horizontal plane in the embodiment, i.e., the direction indicated by the center axes L of the rubber bush 1 and the lock link 6, is a vertical direction perpendicular to the horizontal plane.

Example one

A bias torsion fatigue test device for a rubber bushing comprises a deflection tool 2 and a fixing tool oppositely arranged on the outer side of the deflection tool 2, wherein the deflection tool 2 is used for limiting the deflection angle of the rubber bushing 1, and the fixing tool is used for fixing the deflection angle of the rubber bushing 1; and a torsion tool is further arranged on the outer side of the rubber bushing 1 and is used for carrying out torsion loading on the rubber bushing 1 after the deflection angle is limited and fixed. As shown in fig. 3, the rubber bushing 1 in this embodiment includes an outer sleeve 101, an inner sleeve 102, and a rubber vulcanized body 103 vulcanized between the outer sleeve 101 and the inner sleeve 102, wherein the inner sleeve 102 is of a metal structure, and the outer sleeve 101 is of a thin-layer metal structure having elasticity, or a nylon structure, or other composite structure.

As shown in fig. 3, the deflection tool 2 includes a group of deflection ramps 201 disposed in parallel on both sides of the central axis L of the rubber bushing 1, that is, the deflection ramps 201 include two deflection ramps disposed in parallel; the inclination angle α of the deflection ramp 201 is consistent with the deflection angle required by the rubber bushing 1, where the inclination angle α of the deflection ramp 201 is an included angle between the deflection ramp 201 and a horizontal plane, and α is set according to the deflection angle required by the rubber bushing 1 in an actual working condition. As shown in fig. 5, a sleeving inner hole 202 is formed in the middle of the deflection tool 2, and the sleeving inner hole 202 is used for sleeving the rubber bushing 1; the diameter of the sheathing inner hole 202 is consistent with that of the outer sleeve 101 in the rubber bushing 1, and after the rubber bushing 1 is sheathed and fixed in the sheathing inner hole 202, the peripheral surface of the outer sleeve 101 is attached to the hole wall of the sheathing inner hole 202.

As shown in fig. 3 and 4, the fixing tool is a two-piece assembly structure installed on the outer side of the deflection tool 2, and includes two symmetrically-arranged two-piece fixing sleeves 301, the fixing sleeves 301 are provided with press-fitting platforms 302 corresponding to the deflection sloping platforms 201, and the press-fitting platforms 302 are straight-wall structures parallel to the horizontal plane; as shown in fig. 4, two fixing sleeves 301 are assembled and pressed together, in the process of continuously pressing the fixing sleeves 301, a force is applied to the deflection ramp 201 by the press-fitting table 302 to drive the rubber bushing 1 to deflect, and when the two fixing sleeves 301 of the fixing tool are assembled and the deflection ramp 201 deflects to be parallel to the horizontal plane, the deflection angle is fixed at the set angle.

As shown in fig. 4, when the two deflecting ramps 201 are deflected to a position parallel to the horizontal line by the same deflection angle, the distance between the two deflecting ramps 201 is S1, and when the two-piece fastener pouch 301 is pressed against each other, the distance S2 between the two press-fitting ramps 302 of the two-piece fastener pouch 301 is equal to S1, so that when the two deflecting ramps 201 are deflected to a position parallel to the horizontal line, the press-fitting ramps 302 are pressed against the deflecting ramps 201.

Wherein, a cross section 4 parallel to the central axis L of the rubber bushing 1 is made between the two deflection inclined platforms 201 of the deflection tool 2, and the cross section 4 is of a parallelogram structure. Specifically, the deflection tool 2 may have a parallelogram structure, or may have a cylinder structure with two parallel deflection ramps 201 at two ends, and the deflection tool 2 in this embodiment has a parallelogram structure as shown in fig. 5. In the cross section 4 of the parallelogram structure, a diagonal d1 of two obtuse angles of the parallelogram divides the obtuse angle into two included angles x and y, wherein x and y are both smaller than 90 degrees, so that the deflection inclined table 201 of the rubber bushing 1 can deflect through the force application of a clamping tool and is limited at a position parallel to the horizontal plane by full freedom.

As shown in fig. 6 a, the included angle y is equal to 90 deg., and as shown in fig. 6B, the included angle is greater than 90 deg.. Taking the diagram B as an example, after the deflection ramp 201 contacts the press-fitting inner wall 302 of the two-piece fixing sleeve 301, the length of the obtuse diagonal line d1 in the cross section 4 of the parallelogram is greater than the length of the perpendicular line d2 of the press-fitting inner wall 302 on the side of the possible springback M direction of the deflection tool 2, during the fatigue loading process of the rubber bushing 1, the dimension of the deflection ramp 201 in the direction perpendicular to the press-fitting inner wall 302 tends to decrease, the deflection ramp 201 has the possibility of continuing to deflect, and the deflection ramp 201 will continue to deflect in the direction indicated by the M line and gradually disengage from the contact with the press-fitting inner wall 302. That is to say, when the fixed cover 301 of two lamella that press from both sides tight frock is tight to the clamping and the oblique platform 201 that deflects to parallel with the horizontal plane, the angle of deflection can not be fixed in the angle department of setting for, when other power disturbances, the oblique platform 201 that deflects can continue to deflect and no longer with pressure equipment inner wall 302 pressfitting butt, will influence the experimental precision that deflects, leads to even unable realization to carry out the technological effect of fixed angle deflection loading fatigue test to rubber bush 1.

As shown in fig. 6C, angle x and angle y are both less than 90 °; after the deflection inclined table 201 is contacted with the press-fitting inner wall 302 of the two-piece fixing sleeve 301, the length of the obtuse-angle diagonal line d1 in the cross section 4 of the parallelogram is greater than the length of the perpendicular line d2 of the press-fitting inner wall 302 on the side opposite to the possible rebound M direction of the deflection tool 2, in the process of fatigue loading of the rubber bushing 1, if the deflection inclined table 201 continuously deflects, the size of the deflection inclined table 201 tends to increase in the direction perpendicular to the press-fitting inner wall 302, the deflection inclined table 201 generates a jacking force which jacks towards the press-fitting inner wall 302 of the fixing sleeve 301, and the jacking force is shown as N1 in a C diagram; however, when the two-petal fixing sleeves 301 are abutted and pressed, the two-petal fixing sleeves 301 are fixed, the distance between the two press-fitting inner walls 302 is always equal to S2, the fixing sleeves 301 cannot be spread to increase S2, so that mutual thrust shown by N1 and N2 in a C diagram is generated between the deflection ramp 201 and the press-fitting inner walls 302 to be abutted and fixed, thereby realizing full freedom degree limitation on the deflection angle of the deflection ramp 201, and ensuring stability and reliability of deflection parameters in a test process.

As shown in fig. 3, an anti-slip gasket 7, a bearing assembly 8 and a locking sleeve 9 are sequentially arranged on two sides of a rubber bushing 1 from inside to outside, the rubber bushing 1, the anti-slip gasket 7, the bearing assembly 8 and the locking sleeve 9 are connected through a locking connecting rod 6, the rubber bushing 1, the anti-slip gasket 7, the bearing assembly 8 and the locking sleeve 9 are sleeved on the locking connecting rod 6 and are coaxially arranged with the locking connecting rod 6, and the central axes are all L-shaped; the torsion tool comprises a torsion driving piece connected to the end portion of one side of the locking connecting rod 6, the torsion driving piece in the embodiment is a torsion oil cylinder, a power output end of the torsion oil cylinder is connected with a swing arm 11, the swing arm 11 is fixedly connected with the locking connecting rod 6, and after a deflection angle of the rubber bushing 1 is fixed, the swing arm 11 is driven by the torsion oil cylinder to drive the locking connecting rod 6 and the rubber bushing 1 to perform torsion loading tests. The anti-skid gasket 7 is arranged between the rubber bushing 1 and the bearing seat, the bearing assembly 8 is arranged on the outer side of the anti-skid gasket 7, the locking sleeve 9 is arranged on the outer side of the bearing assembly 8, the swing arm 11 is arranged on the outer side of the locking sleeve 9 on one side, and the locking nut 10 is further arranged on the outer side of the swing arm 11; the other side of the locking connecting rod 6 relative to the bearing assembly 8 is also provided with a locking nut 10 positioned outside the locking sleeve 9, and the rubber bushing 1, the anti-skid gasket 7, the bearing assembly 8 and the locking sleeve 9 are fixed in series through the locking connecting rod 6 by the two locking nuts 10.

Since the torsional loading of the rubber bushing 1 is transmitted to the inner sleeve 106 of the rubber bushing 1 through the swing arm 11, and the tightening force of the lock nut 10 is not enough to transmit the torque to the inner sleeve 106, the friction force between the rubber bushing 1 and other components can be increased through the anti-slip washer 7 to assist the transmission of the torque of the swing arm 11. As shown in fig. 3 and 4, bearing mounting grooves 303 are formed in two sides of the fixing sleeve 301, the bearing mounting grooves 303 are used for fixing a bearing seat in the bearing assembly 8, when the two-piece fixing sleeve 301 is tightly assembled, an outer circle of the bearing seat in the bearing assembly 8 is pressed into the bearing mounting grooves 303, the bearing assembly 8 limits the axial position of the inner sleeve 102 of the rubber bushing 1 to be unchanged, supports the rubber bushing 1 and limits the rubber bushing 1 on a fixed central axis L for a fatigue test, and prevents the rubber bushing 1 from deviating from the central axis L in the process of a loading test, so that the test effect is ensured; as shown in fig. 3, the locking sleeve 9 is located outside the bearing assembly 8, and the inner outer circle of the locking sleeve 9 is fitted into the inner hole of the bearing, so that the locking sleeve 9 can further lock the rubber bushing 1, and the stability of torsional loading is improved.

The implementation mode is as follows:

the method comprises the steps of installing and fixing a rubber bushing 1 into a sleeving inner hole 202 of a deflection tool 2, then installing and fixing the rubber bushing 1 on a locking connecting rod 6 through an inner sleeve 102 in a sleeving manner, sequentially connecting an anti-slip gasket 7, a bearing assembly 8, a locking sleeve 9, a swing arm 11 and a locking nut 10 on the outer side of the rubber bushing 1, oppositely installing two-piece fixing sleeves 301, pressing a press-fitting table 302 to a deflection inclined table 201, applying force to the deflection inclined table 201 to deflect the deflection inclined table 201 to a position parallel to a horizontal plane, and installing the bearing assembly 8 into a bearing installation groove 303 at the same time, so that the deflection angle of the rubber bushing 1 is adjusted, and the rubber bushing 1 is subjected to fixed-angle deflection loading.

And starting the torsion oil cylinder, driving the swing arm 11 to swing through the torsion oil cylinder, driving the locking connecting rod 6 to swing through the swing arm 11, converting the reciprocating linear motion of the torsion oil cylinder into the reciprocating swing of the swing arm 11 and the locking connecting rod 6, and driving the inner sleeve 102 of the rubber bushing 1 to twist through the reciprocating swing of the locking connecting rod 6, thereby carrying out dynamic angle torsion loading on the rubber bushing 1.

Example two

The difference between the present embodiment and the first embodiment is that, as shown in fig. 7 to 9, a plurality of rubber bushings 1 are connected in series between the bearing assemblies 8, each rubber bushing 1 is provided with a deflection tool 2 in a matching manner, the deflection angles of the deflection ramps 201 of different rubber bushings 1 may be the same or different, and the deflection tool 2 is set according to the deflection angle of the rubber bushing 1, specifically: as shown in this embodiment, a set of fixing tools can be used for a plurality of rubber bushings 1, and a press-fitting table 302 matched with each rubber bushing 1 is arranged on the fixing sleeve 301 of the fixing tool at a position corresponding to each rubber bushing 1, so that after the two-piece fixing sleeve 301 is assembled, a distance S2 between the corresponding press-fitting tables 302 is equal to a distance S1 when the deflection inclined table 201 of the corresponding rubber bushing 1 is pressed to be parallel to a horizontal plane; and a matched independent fixing tool can be independently arranged on different rubber bushings 1. An anti-slip gasket 7 is arranged between two adjacent rubber bushings 1 to increase the friction force between the rubber bushings 1, so that the swing arm 11 can conveniently transmit the torsional torque to the rubber bushings 1.

The above embodiments are merely illustrative of the present invention, and are not intended to limit the present invention, and those skilled in the art can modify the embodiments of the present invention as required after reading the present specification without any inventive contribution, but only protected by the patent laws within the scope of the appended claims.

Claims

1. The device for testing the eccentric torsion fatigue of the rubber bushing is characterized by comprising a deflection tool (2) and a fixing tool arranged on the outer side of the deflection tool (2), wherein a sleeving inner hole (202) for accommodating the rubber bushing (1) is formed in the middle of the deflection tool (2), and an outer sleeve (101) of the rubber bushing (1) is attached to the hole wall of the sleeving inner hole (202); the deflection tool (2) comprises deflection inclined tables (201) symmetrically arranged on two sides of the sleeving inner hole (202), and the fixing tool comprises a press-mounting table (302) which is arranged corresponding to the deflection inclined table (201) and can flatten the deflection inclined table (201) to fix the deflection angle of the rubber bushing (1); a locking connecting rod (6) penetrates through an inner sleeve (102) of the rubber bushing (1), and a torsion driving piece capable of driving the rubber bushing (1) to be loaded in a torsion mode is arranged at the end portion of the locking connecting rod (6).

2. The device for testing the offset torsional fatigue of a rubber bushing according to claim 1, wherein the number of the deflection ramps (201) is two, and the distance between the two deflection ramps (201) when the two deflection ramps (201) are deflected to a position parallel to the horizontal line by the same deflection angle is S1; the press mounting tables (302) are symmetrically arranged, and after the two fixed tools are assembled in a butt mode, the distance S2= S1 between the two press mounting tables (302).

3. The device for testing the offset torsional fatigue of the rubber bushing according to claim 2, wherein a cross section (4) parallel to the central axis L of the rubber bushing (1) is made between two offset ramps (201) of the offset tooling (2), and the cross section (4) has a parallelogram structure.

4. The device for testing the offset torsional fatigue of the rubber bushing according to claim 3, wherein the deflection tool (2) is of a parallel quadrangular body structure or a cylindrical body structure with two end faces of the deflection ramp (201).

5. The device for testing the eccentric torsional fatigue of the rubber bushing according to claim 4, wherein bearing assemblies (8) sleeved on the locking connecting rods (6) are arranged on two sides of the rubber bushing (1), and a bearing mounting groove (303) for fixing a bearing seat in the bearing assembly (8) is formed in the fixing tool; the central axis L of the rubber bushing (1) defined by the bearing assembly (8) remains fixed to improve the stability of the torsional loading.

6. The device for testing the partial torsional fatigue of the rubber bushing according to claim 5, wherein an anti-skid gasket (7) sleeved on the locking connecting rod (6) is arranged between the rubber bushing (1) and the bearing seat, and a locking sleeve (9) sleeved on the locking connecting rod (6) is arranged on the outer side of the bearing seat.

7. The device for testing the partial torsional fatigue of the rubber bushing according to claim 6, wherein a lock nut (10) is arranged outside the locking sleeve (9), a swing arm (11) for driving the rubber bushing (1) to carry out torsional loading is connected to a power output end of the torsional driving member, and the swing arm (11) is fixed between the lock nut (10) and the locking sleeve (9) at one side end of the locking connecting rod (6).

8. The device for testing partial torsional fatigue of a rubber bushing according to claim 7, wherein in the cross section (4) of the parallelogram structure, the obtuse angle is divided by the diagonal d1 of the two obtuse angles of the parallelogram into two angles x and y, wherein x and y are both smaller than 90 °.

9. The device for testing the offset torsion fatigue of the rubber bushing according to the claim 8, characterized in that a plurality of rubber bushings (1) sleeved on the locking connecting rod (6) are included between the bearing assemblies (8), and an anti-skid gasket (7) is arranged between the adjacent rubber bushings (1); each rubber bushing (1) is provided with a deflection tool (2) in a matching manner.

10. The device for testing the offset torsional fatigue of the rubber bushing according to claim 9, wherein the shape and size of the deflection tooling (2) on the plurality of rubber bushings (1) or the inclination angle of the deflection ramp (201) can be the same or different.