Reinforced sealing type insert bearing for new energy automobile

Abstract

The invention belongs to the technical field of insert bearings, and discloses a reinforced sealing insert bearing for a new energy automobile, which comprises a sealing mechanism, the sealing mechanism comprises a support ring, a snap ring, a sealing ring, a first sealing lip, a buffer air bag, a labyrinth groove, a folding air bag and a first spring; through cooperation of the labyrinth groove, the buffering air bag and other structures, the sealing effect of the device is improved, and when impurities abut against the buffering air bag, the buffering air bag can buffer the impurities and absorb part of impact force; the situation that the impurities can pass through the first sealing lip due to the fact that the impact force borne by the first sealing lip is large when the impurities suddenly collide with the first sealing lip is avoided, pressure can be better dispersed when the sealing lip is extruded by the impurities, the situation that local stress is too large is relieved, and therefore the service life of the first sealing lip is prolonged, and the service life of the sealing lip is prolonged. The maintenance and replacement frequency of the sealing structure is reduced, and the overall service life of the bearing is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of outer spherical bearings, and in particular is a reinforced sealed outer spherical bearing for new energy vehicles. Background Art

[0002] As the world's attention to environmental protection and sustainable development continues to increase, the new energy vehicle industry is booming. New energy vehicles, especially electric vehicles, have gradually become the mainstream development direction of the automobile market with their advantages such as zero emissions and low noise. During the operation of new energy vehicles, various mechanical components need to work together efficiently and stably. As one of the key components, outer spherical bearings play a vital role. Outer spherical bearings are usually used in the hubs, motors, transmissions and other parts of new energy vehicles. They are responsible for supporting and guiding rotating parts to ensure the stability and reliability of the vehicle during driving. However, compared with traditional fuel vehicles, the operating conditions of new energy vehicles are unique. On the one hand, the motor speed of new energy vehicles is higher and can output strong torque instantly, which puts extremely high demands on the high-speed performance and load-bearing capacity of outer spherical bearings. On the other hand, the battery system of new energy vehicles needs to work in a relatively stable temperature and humidity environment to ensure its performance and life. This requires outer spherical bearings to have good sealing performance to prevent the intrusion of external dust, moisture and impurities, and avoid damage to key components such as motors and batteries.

[0003] The bearing seal of the existing outer spherical bearing for new energy vehicles may only rely on a simple sealing lip structure, lacking an effective buffering and impurity energy consumption mechanism. This makes it easy for the sealing lip to be broken by impurities when facing external impurities, resulting in poor sealing effect. At the same time, in the complex environment faced by new energy vehicles, the sealing structure is easily hit by impurities, resulting in excessive local force, which is easy to cause wear to the sealing structure. Therefore, a reinforced sealing outer spherical bearing for new energy vehicles is proposed. Summary of the invention

[0004] In order to solve the problems raised in the above background technology, the present invention provides a reinforced sealed outer spherical bearing for new energy vehicles.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a reinforced sealed outer spherical bearing for new energy vehicles, comprising a main body mechanism, and also comprising: A sealing mechanism, wherein the sealing mechanism is arranged inside the main body mechanism; Among them, the sealing mechanism includes a supporting ring, a clamping ring, a sealing ring, a first sealing lip, a buffer airbag, a labyrinth groove, a folding airbag and a first spring. The outer side of the supporting ring is fixedly connected with a clamping ring for fixing, the inner wall of the supporting ring is fixedly connected with a sealing ring, the side of the sealing ring away from the clamping ring is fixedly connected with a first sealing lip for sealing, the first sealing lip is fixedly connected with a buffer airbag for buffering, a plurality of labyrinth grooves for changing the direction of impurities and consuming impurity energy are evenly arranged inside the sealing ring, a folding airbag for further consuming impurity energy is arranged inside the labyrinth groove, and the inner wall of the folding airbag is fixedly connected with a first spring for resetting the folding airbag.

[0006] Preferably, the labyrinth groove has an "S" shape, one end of the labyrinth groove is located on the side of the first sealing lip close to the buffer airbag, the labyrinth groove is located above the buffer airbag, and there are two support rings.

[0007] Preferably, a supporting mechanism is provided inside the sealing mechanism, and the supporting mechanism includes a cavity, a piston rod is slidably connected inside the cavity, one end of the piston rod is fixedly connected to a supporting plate, the bottom of the sealing ring is fixedly connected to a second sealing lip, the bottom of the sealing ring is fixedly connected to a fixing block, the side of the fixing block away from the sealing ring is fixedly connected to a supporting airbag, and a vent hole is opened inside the fixing block.

[0008] Preferably, the vent hole passes through the inner wall of the fixed block and is in communication with the support airbag, the end of the piston rod close to the support plate passes through the inner wall of the cavity and extends between the two sealing rings, the top of the vent hole passes through the bottom of the sealing ring and is in communication with the cavity, the second sealing lip is located between the support plate and the fixed block, and the side of the support plate away from the piston rod is in contact with the second sealing lip.

[0009] Preferably, a plurality of cavities are evenly opened inside the sealing ring, a plurality of the labyrinth grooves are respectively communicated with the plurality of cavities, the fixing block is located between the first sealing lip and the second sealing lip, the size of the first sealing lip is larger than the size of the second sealing lip, and the ends of the first sealing lip and the second sealing lip away from the sealing ring are both biased toward the side away from the support plate.

[0010] Preferably, a rotating mechanism is arranged inside the sealing mechanism, and the rotating mechanism includes an inner ring and rivets. A slide groove is provided on the surface of the inner ring, and a plurality of balls are slidably connected to the slide groove. Two retaining frames are arranged on the sides of the balls, and the two retaining frames are fixed by rivets.

[0011] Preferably, the balls are rotatably connected to the two retaining frames, and a plurality of the balls are evenly distributed inside the slide groove.

[0012] Preferably, the inner ring is located on a side of the first sealing lip away from the sealing ring, one end of the first sealing lip and the second sealing lip away from the sealing ring abuts against a surface of the inner ring, and the retaining frame is located between the two sealing rings.

[0013] Preferably, the main body mechanism comprises an outer ring, and the inner wall of the outer ring is provided with two slots.

[0014] Preferably, the support ring is clamped between a clamping ring and a clamping groove, the support ring is located between the outer ring and the inner ring, a sliding groove is provided on the inner wall of the outer ring, and the ball is located between the two sliding grooves.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention improves the sealing effect of the device by arranging the cooperation of structures such as the labyrinth groove and the buffer airbag. When the impurities collide with the buffer airbag, the buffer airbag will buffer the impurities and absorb part of the impact force, thereby preventing the impurities from suddenly colliding with the first sealing lip and causing the first sealing lip to be subjected to a large impact force, resulting in the impurities being able to pass through the first sealing lip. When the sealing lip is squeezed by the impurities, the pressure can be better dispersed, and the situation of excessive local force is alleviated, thereby extending the service life of the first sealing lip, reducing the maintenance and replacement frequency of the sealing structure, and improving the overall service life of the bearing. Subsequently, the impurities will move along the curvature of the first sealing lip in the direction close to the labyrinth groove sealing ring, so that the impurities enter the labyrinth groove, constantly change direction in the curved channel inside the labyrinth groove and gradually lose energy, thereby reducing the possibility of impurities breaking through the first sealing lip from the source. The present invention improves the sealing stability of the first sealing lip by providing the cooperation of the folding airbag and the supporting airbag. During the movement of impurities and as the impurities accumulate, the folding airbag is squeezed, so that the folding airbag is folded in the direction close to the cavity, the space is compressed and the first spring is squeezed, so that the air pressure is increased and the supporting airbag connected thereto is gradually filled by the air pressure, and finally the supporting airbag is abutted against the side of the first sealing lip away from the buffer airbag, so as to support and buffer the first sealing lip, enhance the stability of the first sealing lip, make the first sealing lip more difficult to be broken, further enhance the sealing effect, and ensure that the inside of the bearing is not contaminated by external impurities. The present invention facilitates the improvement of the sealing defense line by arranging the cooperation of structures such as the support plate and the second sealing lip. The increase of air pressure will increase the supporting force on the piston rod, so that the piston rod increases the supporting strength of the second sealing lip through the support plate. When the impurities in the labyrinth groove accumulate to a certain extent, some tiny particles break through the first sealing lip and enter between the first sealing lip and the second sealing lip. When the particles break through, the first sealing lip will be displaced in the direction close to the supporting airbag, squeezing the supporting airbag to further increase the air pressure in the sealing ring, further increasing the supporting strength of the support plate, avoiding deformation of the second sealing lip, thereby ensuring the sealing strength of the second sealing lip, preventing impurities from further entering the interior of the bearing, and improving the sealing effect of the entire sealing system. From the perspective of the double-layer sealing lip, a more reliable sealing defense line is constructed, reflecting the adaptive ability of the sealing structure, so that the sealing structure can maintain good sealing performance under different impurity environments and adapt to the complex and changeable working environment of new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a schematic diagram of the cross-sectional structure of the sealing mechanism of the present invention; Figure 3 For the present invention Figure 2 The enlarged structural diagram at A in the middle; Figure 4 It is a schematic diagram of the cross-sectional structure of the rotating mechanism of the present invention; Figure 5 It is a schematic diagram of the three-dimensional structure of the rotating mechanism of the present invention; Figure 6 It is a schematic diagram of the internal structure of the main mechanism of the present invention; Figure 7 For the present invention Figure 6 The enlarged structural diagram at B in the middle; Figure 8 It is a schematic diagram of the three-dimensional structure of the support structure of the present invention.

[0017] In the figure: 1. Sealing mechanism; 101. Support ring; 102. Snap ring; 103. Sealing ring; 104. First sealing lip; 105. Buffer airbag; 106. Labyrinth groove; 107. Folding airbag; 108. First spring; 2. Support mechanism; 201. Cavity; 202. Piston rod; 203. Support plate; 204. Second sealing lip; 205. Fixed block; 206. Support airbag; 207. Vent; 3. Rotating mechanism; 301. Inner ring; 302. Slide groove; 303. Ball; 304. Retaining frame; 305. Rivet; 4. Main body mechanism; 401. Outer ring; 402. Snap groove. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] like Figures 1 to 8 As shown, the present invention provides a reinforced sealed outer spherical bearing for new energy vehicles, including a main body mechanism 4, and also including: A sealing mechanism 1, which is arranged inside the main body mechanism 4; Among them, the sealing mechanism 1 includes a supporting ring 101, a retaining ring 102, a sealing ring 103, a first sealing lip 104, a buffer airbag 105, a labyrinth groove 106, a folding airbag 107 and a first spring 108. The outer side of the supporting ring 101 is fixedly connected with a retaining ring 102 for fixing, the inner wall of the supporting ring 101 is fixedly connected with a sealing ring 103, the side of the sealing ring 103 away from the retaining ring 102 is fixedly connected with a first sealing lip 104 for sealing, the first sealing lip 104 is fixedly connected with a buffer airbag 105 for buffering, a plurality of labyrinth grooves 106 for changing the direction of impurities and consuming impurity energy are evenly opened inside the sealing ring 103, a folding airbag 107 for further consuming impurity energy is arranged inside the labyrinth groove 106, and a first spring 108 for resetting the folding airbag 107 is fixedly connected to the inner wall of the folding airbag 107.

[0020] The labyrinth groove 106 has an “S” shape. One end of the labyrinth groove 106 is located on a side of the first sealing lip 104 close to the buffer airbag 105 . The labyrinth groove 106 is located above the buffer airbag 105 . There are two supporting rings 101 .

[0021] A rotating mechanism 3 is arranged inside the sealing mechanism 1, and the rotating mechanism 3 includes an inner ring 301 and a rivet 305. A slide groove 302 is provided on the surface of the inner ring 301, and a plurality of balls 303 are slidably connected to the slide groove 302. Two retaining frames 304 are arranged on the side of the ball 303, and the two retaining frames 304 are fixed by rivets 305. The main mechanism 4 includes an outer ring 401, and two card grooves 402 are provided on the inner wall of the outer ring 401.

[0022] The above scheme is adopted: by setting the cooperation of structures such as the labyrinth groove 106 and the buffer airbag 105, the sealing effect of the device is improved. When impurities collide with the buffer airbag 105, the buffer airbag 105 will buffer the impurities and absorb part of the impact force, preventing the impurities from suddenly colliding with the first sealing lip 104 so that the first sealing lip 104 is subjected to a large impact force, resulting in the impurities passing through the first sealing lip 104. When the sealing lip is squeezed by impurities, the pressure can be better dispersed, and the situation of excessive local force is alleviated, thereby extending the service life of the first sealing lip, reducing the maintenance and replacement frequency of the sealing structure, and improving the overall service life of the bearing. Subsequently, the impurities will move along the curvature of the first sealing lip 104 toward the direction of the labyrinth groove 106 sealing ring 103, so that the impurities enter the interior of the labyrinth groove 106, constantly change direction and gradually lose energy in the curved channel inside it, thereby reducing the possibility of impurities breaking through the first sealing lip from the source.

[0023] like Figures 3 to 8 As shown, a support mechanism 2 is arranged inside the sealing mechanism 1, and the support mechanism 2 includes a cavity 201, a piston rod 202 is slidably connected inside the cavity 201, one end of the piston rod 202 is fixedly connected to a support plate 203, a second sealing lip 204 is fixedly connected to the bottom of the sealing ring 103, a fixing block 205 is fixedly connected to the bottom of the sealing ring 103, a support airbag 206 is fixedly connected to the side of the fixing block 205 away from the sealing ring 103, and a vent hole 207 is opened inside the fixing block 205.

[0024] The vent hole 207 passes through the inner wall of the fixed block 205 and communicates with the support airbag 206. The end of the piston rod 202 close to the support plate 203 passes through the inner wall of the cavity 201 and extends between the two sealing rings 103. The top of the vent hole 207 passes through the bottom of the sealing ring 103 and communicates with the cavity 201. The second sealing lip 204 is located between the support plate 203 and the fixed block 205. The side of the support plate 203 away from the piston rod 202 is against the second sealing lip 204. A plurality of cavities 201 are evenly opened inside the sealing ring 103. A plurality of labyrinth grooves 106 are respectively communicated with the plurality of cavities 201. The fixed block 205 is located between the first sealing lip 104 and the second sealing lip 204. The size of the first sealing lip 104 is larger than that of the second sealing lip 204. The ends of the first sealing lip 104 and the second sealing lip 204 away from the sealing ring 103 are both biased toward the side away from the support plate 203.

[0025] The balls 303 are rotationally connected to the two retaining frames 304, and several balls 303 are evenly distributed inside the slide groove 302. The inner ring 301 is located on the side of the first sealing lip 104 away from the sealing ring 103, and the ends of the first sealing lip 104 and the second sealing lip 204 away from the sealing ring 103 are against the surface of the inner ring 301. The retaining frame 304 is located between the two sealing rings 103, and the support ring 101 is clamped between the clamping ring 102 and the clamping groove 402. The support ring 101 is located between the outer ring 401 and the inner ring 301. The inner wall of the outer ring 401 is provided with a slide groove 302, and the balls 303 are located between the two slide grooves 302.

[0026] The above scheme is adopted: by providing the cooperation of the folding airbag 107 and the supporting airbag 206 and other structures, the sealing stability of the first sealing lip 104 is improved. During the movement of impurities and as the impurities accumulate, the folding airbag 107 will be squeezed, so that the folding airbag 107 is folded in the direction close to the cavity 201, the space is compressed and the first spring 108 is squeezed, so that the air pressure is increased and the supporting airbag 206 connected thereto is gradually filled through the air pressure, and finally it will abut against the side of the first sealing lip 104 away from the buffer airbag 105, support and buffer the first sealing lip 104, enhance the stability of the first sealing lip 104, make the first sealing lip 104 more difficult to be broken, further enhance the sealing effect, and ensure that the inside of the bearing is not contaminated by external impurities; By arranging the cooperation of the support plate 203 and the second sealing lip 204 and other structures, it is convenient to improve the sealing defense line. The increase of air pressure will increase the supporting force on the piston rod 202, so that the piston rod 202 increases the supporting strength of the second sealing lip 204 through the support plate 203. When the impurities in the labyrinth groove 106 accumulate to a certain extent, some tiny particles break through the first sealing lip 104 and enter between the first sealing lip 104 and the second sealing lip 204. When the particles break through, the first sealing lip 104 will be displaced in the direction close to the supporting airbag 206, squeezing the supporting airbag 206 to further increase the air pressure in the sealing ring 103, further increase the supporting strength of the support plate 203, avoid deformation of the second sealing lip 204, thereby ensuring the sealing strength of the second sealing lip 204, preventing impurities from further entering the bearing, and improving the sealing effect of the entire sealing system. From the perspective of the double-layer sealing lip, a more reliable sealing defense line is constructed, reflecting the adaptive ability of the sealing structure, so that the sealing structure can maintain good sealing performance under different impurity environments and adapt to the complex and changeable working environment of new energy vehicles.

[0027] The working principle and use process of the present invention are as follows: First, when the bearing is working, the impurities outside the bearing will first collide with the buffer airbag 105, and the buffer airbag 105 will buffer the impurities and absorb part of the impact force, so as to prevent the impurities from suddenly colliding with the first sealing lip 104, so that the first sealing lip 104 is subjected to a large impact force, resulting in the impurities passing through the first sealing lip 104. Then, the impurities will move along the curvature of the first sealing lip 104 toward the direction of the labyrinth groove 106 sealing ring 103, so that the impurities enter the labyrinth groove 106, and the impurities inside the labyrinth groove 106 will be The direction is constantly changed and the energy is gradually lost in the curved channel, which serves as the initial defense line of the device. Meanwhile, during the movement of impurities and as the impurities accumulate, the folded airbag 107 is squeezed, causing the folded airbag 107 to fold toward the cavity 201, compressing the space and squeezing the first spring 108, increasing the air pressure and gradually filling the supporting airbag 206 connected thereto, and finally abutting against the side of the first sealing lip 104 away from the buffer airbag 105, supporting and buffering the first sealing lip 104, which serves as the second defense line of the device. The increase in air pressure will also increase the support force on the piston rod 202, so that the piston rod 202 increases the support strength of the second sealing lip 204 through the support plate 203. When the impurities in the labyrinth groove 106 accumulate to a certain extent, some tiny particles break through the first sealing lip 104 and enter between the first sealing lip 104 and the second sealing lip 204. When the particles break through, the first sealing lip 104 will move toward the direction of the support airbag 206, squeezing the support airbag 206 to further increase the air pressure in the sealing ring 103, further increasing the support strength of the support plate 203, avoiding the deformation of the second sealing lip 204, and preventing impurities from further entering the bearing, which serves as the third line of defense. When the bearing is not working, the first spring 108 will reset the folded airbag 107 through elastic force, so that the impurities that have lost energy in the labyrinth groove 106 are discharged and slide down along the curvature of the first sealing lip 104, thereby preventing the impurities from remaining in the labyrinth groove 106 and affecting the sealing performance when the bearing works next time.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reinforced sealed outer spherical bearing for new energy vehicles, comprising a main body (4), characterized in that: Also includes: A sealing mechanism (1), wherein the sealing mechanism (1) is arranged inside the main body mechanism (4); The sealing mechanism (1) comprises a support ring (101), a snap ring (102), a sealing ring (103), a first sealing lip (104), a buffer airbag (105), a labyrinth groove (106), a folding airbag (107) and a first spring (108); the outer side of the support ring (101) is fixedly connected to a snap ring (102) for fixing; the inner wall of the support ring (101) is fixedly connected to a sealing ring (103); and the side of the sealing ring (103) away from the snap ring (102) is fixedly connected to a A first sealing lip (104) for sealing, a buffer airbag (105) for buffering being fixedly connected to the first sealing lip (104), a plurality of labyrinth grooves (106) for changing the direction of impurities and consuming impurity energy being evenly arranged inside the sealing ring (103), a folding airbag (107) for further consuming impurity energy being arranged inside the labyrinth groove (106), and a first spring (108) for resetting the folding airbag (107) being fixedly connected to the inner wall of the folding airbag (107).

2. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 1, characterized in that: The labyrinth groove (106) has an "S" shape, one end of the labyrinth groove (106) is located on a side of the first sealing lip (104) close to the buffer airbag (105), the labyrinth groove (106) is located above the buffer airbag (105), and there are two support rings (101).

3. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 1, characterized in that: A support mechanism (2) is arranged inside the sealing mechanism (1), and the support mechanism (2) comprises a cavity (201), a piston rod (202) is slidably connected inside the cavity (201), one end of the piston rod (202) is fixedly connected to a support plate (203), a second sealing lip (204) is fixedly connected to the bottom of the sealing ring (103), a fixing block (205) is fixedly connected to the bottom of the sealing ring (103), a support airbag (206) is fixedly connected to the side of the fixing block (205) away from the sealing ring (103), and a vent hole (207) is provided inside the fixing block (205).

4. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 3, characterized in that: The vent hole (207) passes through the inner wall of the fixing block (205) and communicates with the support airbag (206); one end of the piston rod (202) close to the support plate (203) passes through the inner wall of the cavity (201) and extends to between the two sealing rings (103); the top of the vent hole (207) passes through the bottom of the sealing ring (103) and communicates with the cavity (201); the second sealing lip (204) is located between the support plate (203) and the fixing block (205); and the side of the support plate (203) away from the piston rod (202) abuts against the second sealing lip (204).

5. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 3, characterized in that: A plurality of cavities (201) are evenly arranged inside the sealing ring (103); a plurality of the labyrinth grooves (106) are respectively communicated with the plurality of cavities (201); the fixing block (205) is located between the first sealing lip (104) and the second sealing lip (204); the size of the first sealing lip (104) is larger than the size of the second sealing lip (204); and the ends of the first sealing lip (104) and the second sealing lip (204) away from the sealing ring (103) are both biased towards a side away from the support plate (203).

6. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 3, characterized in that: A rotating mechanism (3) is arranged inside the sealing mechanism (1), and the rotating mechanism (3) comprises an inner ring (301) and a rivet (305). A sliding groove (302) is provided on the surface of the inner ring (301), and a plurality of balls (303) are slidably connected to the sliding groove (302). Two retaining frames (304) are arranged on the side surfaces of the balls (303), and the two retaining frames (304) are fixed by rivets (305).

7. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 6, characterized in that: The balls (303) are rotatably connected to the two retaining frames (304), and a plurality of the balls (303) are evenly distributed inside the slide groove (302).

8. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 6, characterized in that: The inner ring (301) is located on a side of the first sealing lip (104) away from the sealing ring (103); one end of the first sealing lip (104) and the second sealing lip (204) away from the sealing ring (103) abuts against a surface of the inner ring (301); and the retaining frame (304) is located between the two sealing rings (103).

9. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 6, characterized in that: The main body mechanism (4) comprises an outer ring (401), and the inner wall of the outer ring (401) is provided with two slots (402).

10. The reinforced sealed outer spherical bearing for new energy vehicles according to claim 9, characterized in that: The support ring (101) is clamped between a clamping ring (102) and a clamping groove (402); the support ring (101) is located between an outer ring (401) and an inner ring (301); a sliding groove (302) is provided on an inner wall of the outer ring (401); and the ball (303) is located between the two sliding grooves (302).

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