Anti-skid shock-absorbing bushing for automobile swing arm

Abstract

The present invention relates to the technical field of shock-absorbing bushings, and specifically to an anti-skid shock-absorbing bushing for an automobile swing arm, comprising an outer tube rubber spring and an inner tube, wherein the outer tube, the rubber spring and the inner tube are coaxially sleeved from outside to inside, the rubber spring comprising an annular groove and a connecting portion, wherein the connecting portions are 2 in number and symmetrically arranged at the front and rear ends of the rubber spring, the annular groove is located between the connecting portions on both sides, the outer tube, the connecting portion and the annular groove form a buffer chamber, and hydraulic oil is arranged in the buffer chamber; the present invention arranges an annular skeleton at the front and rear ends of the rubber spring, and the outer end of the skeleton is welded and fixed to the inner wall of the outer tube, thereby avoiding axial relative sliding between the rubber spring and the outer tube when the rubber spring is subjected to an axial load, thereby ensuring the buffering effect of the bushing, and at the same time, the annular weld between the skeleton and the outer tube ensures the sealing of the buffer chamber, thereby avoiding leakage of the hydraulic oil in the buffer chamber from between the connecting portion and the outer tube, thereby further ensuring the buffering effect of the bushing.

Description

Technical Field

[0001] The invention relates to the technical field of shock-absorbing bushings, in particular to an anti-skid shock-absorbing bushing for an automobile swing arm. Background Art

[0002] The automobile suspension system is a component connecting the frame and the wheels, including swing arms, connecting rods, shock absorbers and springs. The suspension system supports and buffers the impact force transmitted to the frame from the road surface, providing passengers with a more comfortable driving experience. Among them, for conventional vehicles such as private cars and taxis, the swing arms in the suspension system are usually softly connected to the frame through bushings to buffer vibrations and impacts during driving.

[0003] The bushing is usually composed of an outer tube, a rubber spring and an inner tube coaxially arranged, wherein the outer tube and the inner tube are made of metal, the rubber spring is made of rubber, and the rubber spring is bonded to the outer tube and the inner tube through a rubber vulcanized layer. During the driving process of the vehicle, the bushing is not only subjected to radial loads, but also to axial loads. When the bushing is subjected to axial loads, it is easy to cause the vulcanized layer between the rubber spring and the outer tube and the inner tube to tear, thereby causing the rubber spring to tear, resulting in reduced buffering performance or failure of the bushing. In response to the above problems, the prior art has proposed some solutions, such as arranging an inner retaining spring in the outer tube to limit the axial displacement of the rubber spring. However, the retaining spring does not act on the entire end face of the rubber spring. When the rubber spring undergoes elastic deformation, shear force is generated between the retaining spring and the rubber spring, which is easy to tear at the end face of the rubber spring. For example, patent application No. CN202010977543.4 provides a good-performance automobile swing arm bushing. The technical solution is achieved by designing the bushing as a first clamp seat, a side shock absorber assembly, a central shock absorber assembly, and a second clamp seat, and the four are connected by a connecting sleeve. The tube is coaxially connected, and when the bushing is connected to the swing arm, the outer wall of the central shock absorbing assembly is directly connected to the swing arm. The bushing is designed into multiple parts, and the parts are directly plugged and installed, so as to reduce the tearing failure of the rubber parts in the bushing. However, the integrity of the bushing in this scheme is poor, and the processing technology of the parts is complicated and the processing cost is high. For example, patent application No. CN202020915469.9 provides a rear swing arm bushing for an automobile. This technical scheme increases the vulcanization area of ​​the exoskeleton and the rubber layer by setting an arc-shaped groove in the middle of the exoskeleton, thereby reducing the risk of tearing of the rubber layer. However, in the bushing in this technical scheme, the elasticity of the rubber spring is completely used for shock absorption, and the shock absorption effect is affected by the performance of the rubber spring, and the shock absorption effect is poor. In order to improve the buffering performance, a buffer chamber is set between the outer tube and the rubber spring for some bushings, and the buffer chamber is filled with hydraulic oil to improve the buffering effect of the bushing. The setting of the buffer chamber reduces the rubber layer area between the outer tube and the rubber spring, which is easy to cause the tearing of the rubber spring and the leakage of hydraulic oil, thereby reducing the buffering effect of the bushing. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-skid shock-absorbing bushing for an automobile swing arm, so as to solve the problem that the area of ​​the vulcanized layer between the rubber spring and the outer tube in the bushing is too small, and the outer tube and the rubber spring are easily torn when the bushing is subjected to axial load, thereby causing the rubber spring to tear, resulting in reduced or ineffective buffering performance of the bushing, and at the same time solving the deficiencies of the prior art.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A non-slip shock-absorbing bushing for an automobile swing arm comprises an outer tube, a rubber spring and an inner tube. The inner wall of the outer tube is in contact with the outer wall of the rubber spring, and the inner wall of the rubber spring is in contact with the outer wall of the inner tube. The outer tube, the rubber spring and the inner tube are all revolving body structures and are coaxial. The axial length of the inner tube is greater than that of the outer tube. The outer tube and the inner tube are made of metal material, and the rubber spring is made of elastic rubber.

[0007] Specifically, the rubber spring includes an annular groove and a connecting part. The number of the connecting parts is 2 and they are symmetrically arranged at the front and rear ends of the rubber spring. The annular groove is located between the connecting parts on both sides. The outer tube, the connecting part and the annular groove form a buffer chamber. Hydraulic oil is arranged in the buffer chamber. A skeleton is arranged in each of the two connecting parts. The skeleton is annular, and the outer end of the skeleton extends to the outside of the connecting part and is welded to the outer tube. By arranging an annular skeleton in the connecting parts on both sides and welding the outer end of the skeleton to the inner wall of the outer tube, the axial relative sliding between the rubber spring and the outer tube is avoided when the rubber spring is subjected to an axial load, and the buffering effect of the bushing is ensured. At the same time, the annular weld between the skeleton and the outer tube ensures the sealing of the buffer chamber, and avoids the leakage of the hydraulic oil in the buffer chamber from between the connecting part and the outer tube, and further ensures the buffering effect of the bushing.

[0008] Preferably, the skeleton includes a welding section, a conical section and a welding section, the welding section is tubular, and the outer wall of the welding section is fitted with the inner wall of the outer tube, the outer end of the welding section is welded to the outer tube, the conical section is frustum-shaped, and the large end of the conical section is connected to the welding section, and the small end is connected to the welding section, the angle between the welding section and the conical section is an obtuse angle, the angle between the welding section and the welding section is a right angle, and the conical section and the welding section are both embedded in the rubber spring. By embedding the conical section and the welding section in the rubber spring, the connection parts on both sides of the rubber spring are supported, the tear resistance of the connection parts is improved, the integrity of the rubber spring is ensured, and the service life of the bushing is improved.

[0009] Furthermore, the minimum diameter of the welding section is d1, and the minimum diameter of the annular groove is d2, wherein d1<d2; through this arrangement, when the rubber spring is subjected to an axial load and deforms in the axial direction, since d2>d1, a shoulder exists on the rubber spring between the two skeletons, and the welding section is restricted by the shoulder and deforms along with the rubber spring, thereby avoiding excessive shear force between the inner ring of the welding section and the connecting part when the rubber spring undergoes axial compression deformation, thereby reducing the risk of tearing of the connecting part, ensuring the integrity of the rubber spring, and thereby improving the service life of the bushing.

[0010] Preferably, the connecting part is divided into an inner rubber layer and an outer rubber layer by a skeleton, the inner rubber layer is connected to the buffer chamber, a soft rubber layer is provided at the angle between the tapered section and the outer tube, and the roughness of the surfaces where the outer tube, tapered section, inner rubber layer and soft rubber layer are bonded is Ra12.5-Ra25μm.

[0011] By setting the tapered section, an angle is formed between the tapered section and the inner wall of the outer tube, that is, the inner rubber layer and the tapered section are wedge-fitted. By setting a soft rubber layer at the angle between the tapered section and the outer tube, when the liquid pressure in the buffer chamber increases, the hydraulic oil pressure in the buffer chamber acts on the inner rubber layer and squeezes the soft rubber layer toward the tapered section. Due to the wedge-fitting, the sealing of the buffer chamber is further improved, and leakage of the hydraulic oil in the buffer chamber is avoided.

[0012] Furthermore, by providing a soft rubber layer at the angle between the tapered section and the outer tube, when the rubber spring is sleeved into the outer tube, the soft rubber layer plays a role of pre-fixation, which reduces the processing difficulty and assembly requirements of the bushing and facilitates the production and processing of the bushing; and the roughness of the surfaces where the outer tube, tapered section, inner rubber layer and soft rubber layer are bonded is Ra12.5-Ra25μm, which ensures the bonding effect of the soft rubber layer with the outer tube, tapered section and inner rubber layer, and facilitates processing.

[0013] Preferably, the welding section is provided with a plurality of forming grooves, the forming grooves run through the front and rear sides of the welding section, and the plurality of forming grooves are evenly distributed along the circumference of the axis of the skeleton.

[0014] Preferably, the plurality of forming grooves are all in the shape of an isosceles trapezoid, and the lower bottom edge of the forming groove is located on the inner side of the welding section, and the angles of the forming grooves are all provided with rounded corners.

[0015] By setting the forming groove, the connection between the inner rubber layer and the outer rubber layer is increased, and at the same time, the contact length between the inner ring of the welding section and the connecting part is increased. Therefore, when the rubber spring is subjected to axial load, the shear stress can be better dispersed, thereby improving the tear resistance of the connecting part, ensuring the integrity of the rubber spring, and improving the service life of the bushing.

[0016] Furthermore, when the rubber spring is subjected to a torque load, the rubber spring is twisted and deformed. Since the skeleton cannot rotate, a shear force is generated between the rubber spring and the molding groove. By setting the molding groove to an isosceles trapezoidal shape and the lower bottom edge of the molding groove to be arranged on the inner side of the welding section, the force relationship between the rubber spring and the welding section is similar to the force relationship between the external gear and the internal gear ring, thereby reducing the risk of tearing of the rubber spring at the inner ring position of the welding section when the rubber spring is subjected to a torque load, thereby improving the service life of the rubber spring. At the same time, by setting fillets at the angles of the molding groove, stress concentration is avoided, thereby further reducing the risk of stress concentration between the rubber spring and the welding section when the rubber spring is subjected to a torque load, thereby ensuring the service life of the bushing.

[0017] Preferably, a limiting portion is coaxially arranged on the outer side wall of the rubber spring, the limiting portion is located in the annular groove, and the limiting portion is symmetrical front to back, a plurality of limiting protrusions are arranged on the outer side wall of the inner tube, the plurality of limiting protrusions are embedded in the limiting portion, the plurality of limiting protrusions are evenly distributed along the circumference of the axis center line of the inner tube, the side wall of the limiting protrusion is an arc surface, the axis center lines of the plurality of limiting protrusions are parallel to the axis center line of the inner tube, and the axis center line of the limiting protrusion is located outside the inner tube.

[0018] Preferably, both the front and rear ends of the limiting protrusion are provided with spherical surfaces.

[0019] Preferably, the surfaces of the limiting protrusion and the spherical surface are both provided with anti-slip patterns, and the anti-slip patterns are in a mesh shape.

[0020] Through the arrangement of the limiting portion and the limiting block, when the rubber spring is subjected to an axial load, the axial limiting effect of the limiting block prevents relative sliding between the rubber spring and the inner tube; when the rubber spring is subjected to a torque load, the radial limiting effect of the limiting block also prevents relative rotation between the rubber spring and the inner tube.

[0021] Furthermore, if the front and rear ends of the limit block are flat, when the rubber spring is subjected to an axial load, a shear force will be generated between the rubber spring and the limit block, which may easily cause the rubber spring to tear at the joints between the limit portion and the front and rear ends of the limit block. Therefore, by setting the front and rear ends of the limit block to be spherical surfaces, when the rubber spring is subjected to an axial load, the connection between the limit block and the limit portion is an extrusion force, which reduces the risk of the rubber spring tearing at the joints between the limit portion and the front and rear ends of the limit block, thereby ensuring the integrity of the rubber spring and improving the service life of the bushing.

[0022] Furthermore, since the limit block is embedded in the limit part, if the rubber spring is formed and then matched with the inner tube, the existence of the limit block and the spherical surface is not conducive to the installation and matching of the rubber spring and the inner tube. Therefore, preferably, compression molding is adopted between the inner tube and the rubber spring, and a mesh anti-slip pattern is provided on the limit block and the spherical surface to ensure the vulcanization bonding effect between the rubber spring and the inner tube, thereby ensuring the service life of the bushing.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The present invention arranges annular frames at the front and rear ends of the rubber spring, and the outer ends of the frames are welded and fixed to the inner wall of the outer tube, thereby avoiding axial relative sliding between the rubber spring and the outer tube when the rubber spring is subjected to axial load, thereby ensuring the buffering effect of the bushing. At the same time, the annular weld between the frame and the outer tube ensures the sealing of the buffer chamber, thereby avoiding leakage of hydraulic oil in the buffer chamber from between the connecting part and the outer tube, thereby further ensuring the buffering effect of the bushing.

[0025] 2. The present invention increases the connection between the inner rubber layer and the outer rubber layer by arranging an isosceles trapezoidal molding groove on the skeleton, and at the same time increases the contact length between the inner ring of the welding section and the connecting part, so that when the rubber spring is subjected to axial load, the shear stress can be better dispersed, thereby improving the tear resistance of the connecting part, ensuring the integrity of the rubber spring, and improving the service life of the bushing.

[0026] 3. The present invention provides a limiting portion and a limiting block, and both the front and rear ends of the limiting block are set as spherical surfaces. When the rubber spring is subjected to an axial load, the axial limiting of the limiting block avoids relative sliding between the rubber spring and the inner tube, and the connection between the spherical surface and the limiting portion is an extrusion force, which reduces the risk of tearing of the rubber spring at the fitting points between the limiting portion and the front and rear ends of the limiting block, thereby ensuring the integrity of the rubber spring and improving the service life of the bushing; when the rubber spring is subjected to a torque load, the radial limiting effect of the limiting block also avoids relative rotation between the rubber spring and the inner tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of assembling the swing arm and the anti-skid shock-absorbing bushing of the present invention;

[0028] Figure 2 It is a structural schematic diagram of the anti-skid and shock-absorbing bushing of the present invention;

[0029] Figure 3 An exploded view of the anti-skid and shock-absorbing bushing of the present invention;

[0030] Figure 4 It is a front view of the anti-skid shock-absorbing bushing of the present invention;

[0031] Figure 5 for Figure 4 Sectional view at AA in the middle;

[0032] Figure 6 for Figure 5 Magnified view at B in the middle;

[0033] Figure 7 for Figure 5 Sectional view at CC;

[0034] Figure 8 for Figure 5 Sectional view at DD in the middle;

[0035] Fig. 9 for Figure 8 Cross-sectional view at EE, EE and Figure 8 The transverse center axis is offset by 25°.

[0036] In the figure: 1. outer tube; 2. rubber spring; 201. connecting part; 2011. outer rubber layer; 2012. inner rubber layer; 202. annular groove; 203. buffer chamber; 204. limiting part; 205. soft rubber layer; 3. inner tube; 301. limiting protrusion; 3011. anti-slip pattern; 302. spherical surface; 4. skeleton; 401. welding section; 402. conical section; 403. welding section; 4031. molding groove; 4032. fillet; 5. swing arm. DETAILED DESCRIPTION

[0037] See also Figures 1 to 9 The present invention provides an anti-skid and shock-absorbing bushing for an automobile swing arm, and the technical solution is as follows:

[0038] See also Figures 1 to 3 A non-slip shock-absorbing bushing for an automobile swing arm comprises an outer tube 1, a rubber spring 2 and an inner tube 3. The inner wall of the outer tube 1 fits with the outer wall of the rubber spring 2, and the inner wall of the rubber spring 2 fits with the outer wall of the inner tube 3. The outer tube 1, the rubber spring 2 and the inner tube 3 are all rotating body structures and are coaxial. The axial length of the inner tube 3 is greater than the axial length of the outer tube 1. The outer tube 1 and the inner tube 3 are made of 40Cr, and the rubber spring 2 is made of elastic rubber.

[0039] See also Figures 3 to 6 , Fig. 9The rubber spring 2 includes an annular groove 202 and a connecting portion 201. The connecting portions 201 are 2 in number and are symmetrically arranged at the front and rear ends of the rubber spring 2. The annular groove 202 is located between the connecting portions 201 on both sides. The outer tube 1, the connecting portion 201 and the annular groove 202 form a buffer chamber 203. Hydraulic oil is arranged in the buffer chamber 203. The two connecting portions 201 are both provided with a skeleton 4. The skeleton 4 is annular. The skeleton 4 includes a welding section 401, a conical section 402 and a welding section 403. The welding section 401 is tubular, and the outer wall of the welding section 401 is in contact with the inner wall of the outer tube 1. The outer end of the welding section 401 is welded to the outer tube 1. The conical section 402 is frustum-shaped, and the large end of the conical section 402 is connected to the welding section 403. The rubber spring 201 is connected to the outer tube 1, and the small end is connected to the welding section 403. The angle between the welding section 401 and the conical section is obtuse, and the angle between the welding section 403 and the welding section 401 is right angle. The conical section 402 and the welding section 403 are both embedded in the rubber spring 2. The minimum diameter of the welding section 403 is d1, and the minimum diameter of the annular groove 202 is d2, d1<d2; the connecting portion 201 is divided into an inner rubber layer 2012 and an outer rubber layer 2011 by the skeleton 4, the inner rubber layer 2012 is connected to the buffer chamber 203, and a soft rubber layer 205 is provided at the angle between the conical section 402 and the outer tube 1, and the roughness of the surfaces where the outer tube 1, the conical section 402, the inner rubber layer 2012 and the soft rubber layer 205 are bonded is Ra12.5.

[0040] See also Figure 5 and Figure 8 , 8 forming grooves 4031 are provided on the welding section 403, and the forming grooves 4031 run through the front and rear sides of the welding section 403. The 8 forming grooves 4031 are evenly distributed along the circumference of the axis of the skeleton 4. The 8 forming grooves 4031 are all in the shape of isosceles trapezoids, and the lower bottom edge of the forming groove 4031 is located on the inner side of the welding section 403, and the included angles of the forming grooves 4031 are all provided with rounded corners 4032.

[0041] See also Figure 3 , Figure 5 and Figure 7 A limiting portion 204 is coaxially arranged on the outer wall of the rubber spring 2, the limiting portion 204 is located in the annular groove 202, and the limiting portion 204 is symmetrical front to back, and six limiting protrusions 301 are arranged on the outer wall of the inner tube 3, the six limiting protrusions 301 are embedded in the limiting portion 204, the six limiting protrusions 301 are evenly distributed along the circumference of the axis of the inner tube 3, the side wall of the limiting protrusion 301 is an arc surface, the axis of the six limiting protrusions 301 are parallel to the axis of the inner tube 3, and the axis of the limiting protrusion 301 is located outside the inner tube 3, the front and rear ends of the limiting protrusion 301 are provided with spherical surfaces 302, the surfaces of the limiting protrusion 301 and the spherical surface 302 are provided with anti-slip patterns 3011, and the anti-slip patterns 3011 are mesh-shaped.

[0042] Please refer to Figures 1 to 9It should be noted that, when the bushing is processed, the inner tube 3, the rubber spring 2 and the skeleton 4 are integrally formed by compression molding, wherein the connection between the inner rubber layer 2012 and the welding section 401 and the tapered section 402 reserves an installation position for the soft rubber layer 205; after the inner tube 3, the rubber spring 2 and the skeleton 4 are compression molded, the rubber spring 2 is inserted into the outer tube 1, wherein the outer tube 1 is provided with two glue inlet holes and one liquid inlet hole, the two glue inlet holes correspond to the soft rubber layers 205 on both sides respectively, and the liquid inlet hole corresponds to the buffer chamber 203, after the rubber spring 2 is inserted into the outer tube 1, the glue is injected into the installation groove of the soft rubber layer 205 through the two glue inlet holes, the glue adopts polyurethane glue, and the riveting method is adopted after the glue injection is completed. The two glue inlet holes are closed, and after the soft glue layer 205 solidifies, the welding sections 401 on both sides are welded, and the height of the weld leg is equal to the wall thickness of the welding section 401; after welding is completed, hydraulic oil is injected into the buffer chamber 203 through the liquid inlet, and hydraulic pressure is applied to the hydraulic oil in the buffer chamber 203 during the injection process, and observe whether there is leakage at the front and rear ends of the rubber spring 2. If there is leakage, the skeleton 4 on the leakage side is re-polished and reworked to ensure that there is no hydraulic oil leakage during the pressure test in the buffer chamber 203; if there is no leakage, the liquid inlet hole is closed by riveting; after completing the glue injection, welding and liquid injection, the outer wall of the outer tube 1 is turned to the required size of the drawing by a lathe, and the processing of the bushing is completed.

[0043] When installing the bushing and the swing arm 5, the outer tube 1 and the swing arm 5 are interference fit, and the bushing is pressed into the mounting hole of the swing arm 5 by a hydraulic tool. When the two side surfaces of the outer tube 1 are flush with the two side surfaces of the swing arm 5, the installation of the bushing and the swing arm 5 is completed; then the inner hole of the inner tube 3 is coaxially aligned with the mounting hole on the frame (not shown in the figure), and the bolts are inserted through the mounting hole of the frame and the inner hole of the inner tube 3. The bolts are pre-tightened first, and then the vehicle is placed on the ground to a natural state, and then the bolts are tightened until the two sides of the inner tube 3 are in contact with the frame, and the installation of the bushing, the swing arm 5 and the frame is completed.

[0044] When the vehicle bumps, the bushing is subjected to axial load, radial load and torque load respectively; when the bushing is subjected to axial load, the swing arm 5 undergoes axial displacement, while the inner tube 3 is fixedly connected to the frame, and under the limiting action of the limit block and the spherical surface 302, the inner wall of the rubber spring 2 does not undergo axial displacement, that is, the inner wall of the rubber spring 2 and the inner tube 3 remain stationary, and the skeleton 4 follows the outer tube 1 to undergo axial displacement. Due to the limiting effect of the skeleton 4 on the rubber spring 2 on both sides, the outer side wall of the rubber spring 2 follows the outer tube 1 to undergo displacement, and the rubber spring 2 undergoes elastic deformation. After the axial load on the bushing is eliminated, the rubber spring 2 returns to its original state; when the bushing is subjected to radial load, the swing arm 5 undergoes radial displacement, and the outer tube 1 follows the swing arm to undergo radial displacement, while the inner tube 3 is fixedly connected to the frame, the position of the inner tube 3 remains unchanged, the rubber spring 2 undergoes elastic deformation, and at the same time the volume of the buffer chamber 203 decreases, and the volume of the buffer chamber 203 decreases. The pressure increases, and the liquid pressure in the buffer chamber 203 acts on the inner rubbers on both sides and squeezes the soft rubber layer 205 toward the conical surface section. After the radial load on the bushing is eliminated, the rubber spring 2 returns to its original state, the volume in the buffer chamber 203 returns to its original volume, and the liquid pressure in the buffer chamber 203 decreases to its original pressure; the bushing is subjected to the torque load, the swing arm 5 is twisted, and the outer tube 1 is twisted following the swing arm 5, while the inner tube 3 is fixedly connected to the frame, and the inner tube 3 does not twist. Under the limiting action of the limit block, the inner wall of the rubber spring 2 does not twist, that is, the inner wall of the rubber spring 2 and the inner tube 3 remain stationary, and the skeleton 4 is twisted following the outer tube 1. Due to the limiting effect of the skeletons 4 on both sides on the rubber spring 2, the outer wall of the rubber spring 2 is twisted following the outer tube 1, and the rubber spring 2 is twisted and deformed. After the torque load on the bushing is eliminated, the rubber spring 2 returns to its original state.

[0045] A specific embodiment of the present invention is described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above described embodiment. For those skilled in the art, various changes, modifications, substitutions and variations of these embodiments without departing from the principles and ideas of the present invention should still fall within the scope of protection of the present invention.

Claims

1. An anti-skid shock-absorbing bushing for an automobile swing arm, comprising an outer tube (1), a rubber spring (2) and an inner tube (3), wherein the outer tube (1), the rubber spring (2) and the inner tube (3) are coaxially sleeved from outside to inside, and characterized in that: The rubber spring (2) comprises an annular groove (202) and a connecting portion (201). The connecting portions (201) are two in number and are symmetrically arranged at the front and rear ends of the rubber spring (2). The annular groove (202) is located between the connecting portions (201) on both sides. The outer tube (1), the connecting portion (201) and the annular groove (202) form a buffer chamber (203). Hydraulic oil is arranged in the buffer chamber (203). The two connecting portions (201) are each provided with a skeleton (4). The skeleton (4) is annular, and the outer end of the skeleton (4) extends outside the connecting portion (201) and is welded to the outer tube (1). The skeleton (4) comprises a welding section (401), a conical section (402) and a welding section (403); the welding section (401) is tubular, and the outer wall of the welding section (401) is in contact with the inner wall of the outer tube (1); the outer end of the welding section (401) is welded to the outer tube (1); the conical section (402) is frustum-shaped, and the large end of the conical section (402) is connected to the welding section (401), and the small end is connected to the welding section (403); the angle between the welding section (401) and the conical section is an obtuse angle, and the angle between the welding section (403) and the welding section (401) is a right angle; the conical section (402) and the welding section (403) are both embedded in the rubber spring (2); the minimum diameter of the welding section (403) is d1, and the minimum diameter of the annular groove (202) is d2, and d1<d2; The connecting portion (201) is divided into an inner rubber layer (2012) and an outer rubber layer (2011) by a skeleton (4); the inner rubber layer (2012) is connected to the buffer chamber (203); a soft rubber layer (205) is provided at an angle between the tapered section (402) and the outer tube (1); and the roughness of the surfaces where the outer tube (1), the tapered section (402), the inner rubber layer (2012) and the soft rubber layer (205) are bonded is Ra12.5-Ra25 μm.

2. The anti-skid shock-absorbing bushing for an automobile swing arm according to claim 1, characterized in that: The welding section (403) is provided with a plurality of forming grooves (4031), the forming grooves (4031) penetrate the front and rear sides of the welding section (403), and the plurality of forming grooves (4031) are evenly distributed along the circumference of the axis of the skeleton (4).

3. The anti-skid shock-absorbing bushing for automobile swing arm according to claim 2, characterized in that: The plurality of forming grooves (4031) are all in the shape of an isosceles trapezoid, and the lower bottom edge of the forming groove (4031) is located on the inner side of the welding section (403), and the included angles of the forming grooves (4031) are all provided with rounded corners (4032).

4. The anti-skid shock-absorbing bushing for automobile swing arm according to claim 1, characterized in that: A limiting portion (204) is coaxially arranged on the outer wall of the rubber spring (2), the limiting portion (204) is located in the annular groove (202), and the limiting portion (204) is symmetrical in front and back. A plurality of limiting protrusions (301) are arranged on the outer wall of the inner tube (3), the plurality of limiting protrusions (301) are embedded in the limiting portion (204), the plurality of limiting protrusions (301) are evenly distributed along the circumference of the axis of the inner tube (3), the side wall of the limiting protrusion (301) is an arc surface, the axis of the plurality of limiting protrusions (301) are parallel to the axis of the inner tube (3), and the axis of the limiting protrusion (301) is located outside the inner tube (3).

5. The anti-skid shock-absorbing bushing for automobile swing arm according to claim 4, characterized in that: The limiting protrusion (301) is provided with spherical surfaces (302) at both the front and rear ends.

6. The anti-skid shock-absorbing bushing for automobile swing arm according to claim 4, characterized in that: The surfaces of the limiting protrusion (301) and the spherical surface (302) are both provided with anti-slip grooves (3011), and the anti-slip grooves (3011) are in a mesh shape.

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