A motorcycle fork shock absorber

Abstract

The present application relates to the field of shock absorber, especially to a motorcycle front fork shock absorber, which mainly solves the problem of poor damping effect of the motorcycle front fork shock absorber in the prior art, comprising a hydraulic cylinder, a first sleeve, a second sleeve, a piston, a first spring, a second spring, a first bushing, a first sealing cover, a second sealing cover, a connecting plate and an adjusting device, the first sealing cover is arranged at the upper end of the hydraulic cylinder, the adjusting device is arranged at the lower part of the hydraulic cylinder, the first sleeve is arranged in the hydraulic cylinder, the second sealing cover is arranged at the upper end of the first sleeve, a first communication hole is arranged at the lower part of the first sleeve and in the hydraulic cylinder, the second sleeve is arranged in the first sleeve, the lower end of the second sleeve is arranged out of the first sleeve and connected with the adjusting device, a supporting ring is arranged at the upper end of the second sleeve, the piston is arranged on the second sleeve, and a second communication hole, a third communication hole and a fourth communication hole are arranged at the upper part of the second sleeve and in the first sleeve respectively.

Description

Technical Field

[0001] The present invention relates to the field of shock absorbers, in particular to a motorcycle front fork shock absorber. Background Art

[0002] In order to mitigate and attenuate the impact and vibration caused by uneven roads during driving, ensure smoothness and comfort of driving, and help improve the service life and handling stability of the motorcycle, motorcycles are equipped with shock absorbers.

[0003] The Chinese application number is 03234269.1, and the authorization announcement number is CN 2621963Y. The invention discloses an inverted front shock absorber with an inner monotube damper, which is suitable for mid- and high-end off-road vehicles and racing cars. The invention comprises a bottom tube, a front fork tube, a dust cover, an outer tube, an end cover, a buffer pad, a bushing seat, a gasket, an oil seal, a shock absorber spring, a base, a positioning seat, a screw, a locking nut, an open washer, a retaining ring, a piston body, a limit pad, a buffer spring, a working cylinder, a guide seat, a connecting rod, and a damper. One end of the front fork tube is provided with a bottom tube, and the other end is provided with an outer tube. A bushing is provided between the outer wall of the front fork tube and the inner wall of the outer tube. A damper is provided in the front fork tube, and a shock absorber spring is provided on the damper. One end of the shock absorber spring contacts the positioning seat, and the other end is limited by the bushing seat provided on the damper. A piston ring is provided between the bushing seat and the inner wall of the front fork tube. During operation, the outer cylinder is mated to the upper and lower portions of the vehicle's steering column. Shock absorber oil is added to the monotube damper, and the oil level is higher than the piston body. External force exerts on the outer cylinder (4), which drives the damper to the left. This forces the damper in the working cylinder to generate compression resistance through the damping hole in the piston body, creating a high-pressure chamber inside the damper. This compresses the shock spring, achieving the damping effect. As the shock spring returns to its original length, force acts on the bushing seat, which, through the positioning tube, drives the damper to the left and right. This forces the shock absorber oil in the left end of the working cylinder to flow through the damping hole in the piston body, generating restoring resistance and returning the shock spring to its original position. During this entire movement, the outer wall of the front fork tube and the inner wall of the outer cylinder are shielded from direct contact by the bushing and support, reducing friction and improving the shock absorber's flexibility and bending strength.

[0004] However, the above-mentioned motorcycle shock absorber cannot meet the shock absorption requirements of motorcycles under different road conditions, different jumping degrees, and different turning angles, so that the shock absorber cannot absorb vibrations and impacts from the road comfortably, stably, flexibly, and effectively; especially for racing motorcycles, its shock absorption effect is poor. Summary of the Invention

[0005] Therefore, in view of the above problems, the present invention provides a motorcycle front fork shock absorber, which mainly solves the problem of poor shock absorption effect of motorcycle front fork shock absorbers in the prior art.

[0006] To achieve the above object, the present application adopts the following technical solutions:

[0007] A motorcycle front fork shock absorber, comprising a hydraulic cylinder, a first sleeve, a second sleeve, a piston, a first spring, a second spring, a first bushing, a first sealing cover, a second sealing cover, a connecting plate and an adjusting device, the lower end of the hydraulic cylinder is provided with a first mounting seat, the first mounting seat is provided with a first mounting hole extending in the radial direction of the hydraulic cylinder, the upper part of the hydraulic cylinder and on both sides of the hydraulic cylinder in the radial direction are respectively provided with a second mounting seat and a third mounting seat, the second mounting seat is provided with a second mounting hole, the third mounting seat is provided with a third mounting hole, the middle part of the hydraulic cylinder and on the same side as the third mounting seat are provided with a fourth mounting seat, the fourth mounting seat is provided with a fourth mounting hole, the upper and lower ends of the connecting plate are respectively locked on the third mounting seat and the fourth mounting seat through bolts, the first sealing cover is arranged at the upper end of the hydraulic cylinder, the adjusting device is arranged at the lower part of the hydraulic cylinder, the first sleeve is arranged in the hydraulic cylinder, and the upper end of the first sleeve extends outward through the first sealing cover, the second sealing cover is arranged at the upper end of the first sleeve, the lower part of the first sleeve and in the hydraulic cylinder is provided with a first communication hole, the second sleeve is arranged in the first sleeve, the lower end of the second sleeve extends out of the first sleeve and is connected with the adjusting device, the upper end of the second sleeve is provided with a support ring, the piston is arranged on the second sleeve and is distributed in the first sleeve, the upper part of the second sleeve and in the first sleeve are respectively provided with a second communication hole, a third communication hole and a fourth communication hole, the second communication hole, the third communication hole and the fourth communication hole are distributed on the lower side of the piston, the distance size between the second communication hole and the piston is smaller than the distance size between the third communication hole and the piston, the distance size between the third communication hole and the piston is smaller than the distance size between the fourth communication hole and the piston, the lower part of the second sleeve is provided with two fifth communication holes, the first bushing is arranged between the first sleeve and the second sleeve and is distributed on the lower side of the piston, the first spring is arranged in the first sleeve, and the two ends of the first spring are respectively abutted on the second sealing cover and the support ring, the second spring is sleeved on the second sleeve, and the two ends of the second spring are respectively connected with the support ring and the piston, a first cavity is formed through the second sealing cover, the first sleeve, the second sleeve, the piston and the adjusting device, a second cavity is formed through the first sealing cover, the hydraulic cylinder, the first sleeve, the second sleeve and the piston, the first cavity and the second cavity are both filled with damping oil, and the flow rate of the damping oil into and out of the first cavity is adjusted by the adjusting device.

[0008] Further, the adjusting device comprises an adjusting seat and an adjusting rod, the adjusting seat is fixed on the hydraulic cylinder, the adjusting seat is provided with an adjusting hole in the axial direction of the hydraulic cylinder, the lower end of the second sleeve is embedded in the adjusting hole, the adjusting rod is embedded in the adjusting hole and is rotationally connected with the adjusting seat, the adjusting rod is externally threaded, the upper part of the adjusting rod is embedded in the second sleeve and is threadedly connected with the second sleeve.

[0009] Further, the first sealing cover comprises an end cover, a top ring, an elastic sleeve, a metal elastic ring and a second bushing, the upper surface of the top ring abuts against the lower end surface of the end cover, the upper surface and the lower surface of the elastic sleeve are respectively provided with an upper annular groove and a lower annular groove, the lower end surface of the top ring abuts against the upper end surface of the elastic sleeve, the metal elastic ring is clamped on the circumferential outer surface of the elastic sleeve, and the upper end of the second bushing is embedded in the lower annular groove.

[0010] Further, the upper end surface of the elastic sleeve is divided into an inner ring and an outer ring through the upper annular groove, the circumferential outer surface of the top ring is provided in the form of an inclined surface, the lower end surface of the top ring abuts against the inner ring, and the circumferential outer surface of the top ring abuts against the outer surface of the upper annular groove.

[0011] Further, the metal elastic ring has a notch, the metal elastic ring comprises a first curved portion, a second curved portion, a third curved portion, a fourth curved portion and a fifth curved portion which are integrally connected in sequence, the first curved portion and the second curved portion are axially symmetrically distributed along the center line of the third curved portion with the fifth curved portion and the fourth curved portion, the concave surface of the first curved portion faces the inner surface, the concave surface of the second curved portion faces the outer surface, the curvature radius of the second curved portion is smaller than that of the first curved portion, and the curvature radius of the first curved portion is smaller than that of the third curved portion.

[0012] Further, the hydraulic cylinder is provided with a fifth mounting seat and a sixth mounting seat in the form of a triangular structure on the lower side of the second mounting seat, the sixth mounting seat is distributed on the lower side of the fifth mounting seat, the cross-sectional area of the sixth mounting seat is larger than that of the fifth mounting hole, the fifth mounting seat is provided with the fifth mounting hole, and the sixth mounting seat is provided with the sixth mounting hole.

[0013] Further, the lower part of the fifth mounting seat is provided with a first extension, and the first extension is provided with a seventh mounting hole.

[0014] Further, the lower part of the sixth mounting seat is provided with a second extension, and the second extension is provided with an eighth mounting hole and a ninth mounting hole.

[0015] Further, the hydraulic cylinder is provided with a reinforcing rib distributed in the axial direction thereof.

[0016] Furthermore, a first connecting hole and a second connecting hole are respectively provided in the middle of the connecting plate, and the central axes of the first connecting hole and the second connecting hole are perpendicular to the central axis of the third mounting hole.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are as follows: the upper end of the first sleeve of the motorcycle front fork shock absorber is installed on the fork shoulder of the motorcycle front fork, and is connected to the motorcycle body through the first mounting seat, the second mounting seat, the third mounting seat and the fourth mounting seat of the hydraulic cylinder, and the third mounting seat and the fourth mounting seat are connected by the connecting plate, so that the connection between the shock absorber and the motorcycle is firm, and the mounting seat arrangement on the hydraulic cylinder can balance the impact and vibration generated during the running of the motorcycle on the hydraulic cylinder, thereby improving the connection strength between the hydraulic cylinder and the mounting seat, avoiding the problem of breakage caused by large impact, and when in use, the impact force The first sleeve is used to make the first sleeve and the hydraulic cylinder slide toward each other. Similarly, the first sleeve and the second sleeve slide toward each other, so that the piston on the second sleeve squeezes the damping oil in the first sleeve, and the support ring on the second sleeve squeezes the first spring. The piston slides upward, so that the volume of the first cavity is reduced, and then the damping oil in the first cavity flows out through the second flow hole, the third flow hole, the fourth flow hole and the two fifth flow holes on the second sleeve into the second cavity. In this way, energy is consumed by the flow of the damping oil, thereby eliminating the impact force and achieving a buffering effect. When the impact force is small, the first sleeve and the second sleeve The relative sliding movement distance of the cylinder is small, and the second flow hole, the third flow hole and the fourth flow hole are not separated from the first bushing. Since the first bushing is embedded between the first sleeve and the second sleeve, the distance between the two is small, and the flow path area of ​​the damping oil is relatively small, so the flow rate of the damping oil is reduced, thereby forming a smaller damping effect; when the impact force is large, the relative sliding movement distance of the first sleeve and the second sleeve is large. At this time, the second flow hole, the third flow hole and the fourth flow hole are separated from the first bushing in turn as the impact force increases, and the first flow channel connects the inner and outer sides of the first sleeve, increasing the flow path formed by the second flow hole, the third flow hole, the fourth flow hole and the two third flow holes. The damping oil flowing out of the five flow circulation holes flows into the flow path area of ​​the second cavity, thereby increasing the flow rate of the damping oil, thereby forming a larger damping effect, and by setting the distance between the second connecting hole and the piston to be smaller than the distance between the third connecting hole and the piston, and the distance between the third connecting hole and the piston to be smaller than the distance between the fourth connecting hole and the piston, it can be adaptively adjusted according to the size of the impact force, so as to adapt to various road conditions and improve the use effect. At the same time, the flow rate of the damping oil in and out of the first cavity is adjusted by the adjustment device, so that the adjustment damping range of the shock absorber is improved, further adapting to various road conditions and improving the use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0019] Figure 2 is a schematic diagram of the decomposed structure of the first state of an embodiment of the present invention;

[0020] Figure 3 is a schematic diagram of the decomposed structure of the second state of an embodiment of the present invention;

[0021] Figure 4 is a schematic diagram of the decomposed structure of the third state of the embodiment of the present invention;

[0022] Figure 5 is a schematic diagram of the decomposed structure of the fourth state of an embodiment of the present invention;

[0023] Figure 6 is a schematic diagram of the decomposed structure of the fifth state of the embodiment of the present invention;

[0024] Figure 7 It is a schematic cross-sectional view of the hydraulic cylinder, the first sleeve, the second sleeve, the piston, the first bushing and the adjusting device in an embodiment of the present invention;

[0025] Figure 8 1 is a schematic diagram of the three-dimensional structure of the first sleeve, the piston and the first bushing in an embodiment of the present invention;

[0026] Figure 9 1 is a schematic diagram of the three-dimensional structure of the hydraulic cylinder in an embodiment of the present invention;

[0027] Figure 10 1 is a schematic diagram of the three-dimensional structure of the first sleeve in an embodiment of the present invention;

[0028] Figure 11 1 is a schematic diagram of the three-dimensional structure of the second sleeve in a front view according to an embodiment of the present invention;

[0029] Figure 12 is a schematic diagram of the three-dimensional structure of the second sleeve in a rear view state in an embodiment of the present invention;

[0030] Figure 13 It is a schematic diagram of the three-dimensional structure of the metal elastic ring in an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0032] The embodiments of the present invention are:

[0033] refer to Figures 1 to 13As shown, a motorcycle front fork shock absorber includes a hydraulic cylinder 1, a first sleeve 2, a second sleeve 3, a piston 4, a first spring 5, a second spring 6, a first bushing 7, a first sealing cover 8, a second sealing cover 9, a connecting plate 10 and an adjusting device 11. The lower end of the hydraulic cylinder 1 is provided with a first mounting seat 12, and the first mounting seat 12 is provided with a first mounting hole 13 extending in the radial direction of the hydraulic cylinder 1. The upper part of the hydraulic cylinder 1 and the radial sides of the hydraulic cylinder 1 are respectively provided with a second mounting seat 14 and a third mounting seat 16, the second mounting seat 14 is provided with a second mounting hole 15, the third mounting seat 16 is provided with a third mounting hole 17, and the middle part of the hydraulic cylinder 1 and the same side as the third mounting seat 16 are distributed A fourth mounting seat 18 is provided, and a fourth mounting hole 19 is provided on the fourth mounting seat 18. The upper and lower ends of the connecting plate 10 are respectively fastened to the third mounting seat 16 and the fourth mounting seat 18 by bolts. The first sealing cover 8 is provided at the upper end of the hydraulic cylinder 1, and the adjusting device 11 is provided at the lower part of the hydraulic cylinder 1. The first sleeve 2 is provided in the hydraulic cylinder 1, and the upper end of the first sleeve 2 extends outward through the first sealing cover 8. The second sealing cover 9 is provided at the upper end of the first sleeve 2. A first communicating hole 31 is provided at the lower part of the first sleeve 2 and is located in the hydraulic cylinder 1. The second sleeve 3 is provided in the first sleeve 2, and the lower end of the second sleeve 3 passes through the first sleeve 2 and is connected to the adjusting device 11. A support ring 30 is provided at the upper end of the second sleeve 3. The piston 4 is provided on the second sleeve 3 and distributed in the first sleeve 2. A second communicating hole 32, a third communicating hole 33 and a fourth communicating hole 34 are respectively provided in the upper part of the second sleeve 3 and located in the first sleeve 2. The second communicating hole 32, the third communicating hole 33 and the fourth communicating hole 34 are distributed on the lower side of the piston 4. The distance between the second communicating hole 32 and the piston 4 is smaller than the distance between the third communicating hole 33 and the piston 4. The distance between the third communicating hole 33 and the piston 4 is smaller than the distance between the fourth communicating hole 34 and the piston 4. Two fifth communicating holes 35 are provided at the lower part of the second sleeve 3. The first bushing 7 is provided between the first sleeve 2 and the second sleeve. 3, and is distributed on the lower side of the piston 4. The first spring 5 is inserted into the first sleeve 2, and the two ends of the first spring 5 respectively abut against the second sealing cover 9 and the support ring 30. The second spring 6 is sleeved on the second sleeve 3, and the two ends of the second spring 6 are respectively connected to the support ring 30 and the piston 4. A first cavity 100 is formed by the second sealing cover 9, the first sleeve 2, the second sleeve 3, the piston 4 and the adjusting device 11. A second cavity 200 is formed by the first sealing cover 8, the hydraulic cylinder 1, the first sleeve 2, the second sleeve 3 and the piston 4. The first cavity 100 and the second cavity 200 are both filled with damping oil, and the flow rate of the damping oil in and out of the first cavity 100 is adjusted by the adjusting device 11.

[0034] The motorcycle front fork shock absorber, the upper end of the first sleeve 2 is installed on the fork shoulder of the motorcycle front fork, and is connected to the motorcycle body through the first mounting seat 12, the second mounting seat 14, the third mounting seat 16 and the fourth mounting seat 18 of the hydraulic cylinder 1, and the third mounting seat 16 and the fourth mounting seat 18 are connected by the connecting plate 10, so that the connection between the shock absorber and the motorcycle is firm, and the mounting seat arrangement on the hydraulic cylinder 1 can balance the impact and vibration generated during the driving of the motorcycle on the hydraulic cylinder, improve the connection strength between the hydraulic cylinder 1 and the mounting seat, and avoid the problem of breakage caused by large impact. When in use, the impact force acts on the first sleeve 2, causing the first sleeve 2 and the hydraulic cylinder 1 to slide toward each other. In the embodiment of the present invention, the first sleeve 2 and the second sleeve 3 slide toward each other, so that the piston 4 on the second sleeve 3 squeezes the damping oil in the first sleeve 2, and the support ring 30 on the second sleeve 3 squeezes the first spring 5. The piston 4 slides upward, so that the volume of the first cavity 100 is reduced, and the damping oil in the first cavity 100 flows out through the second flow hole 32, the third flow hole 33, the fourth flow hole 34 and the two fifth flow flow holes 35 on the second sleeve 3 into the second cavity 200. In this way, energy is consumed by the flow of the damping oil, thereby eliminating the impact force and achieving a buffering effect. When the impact force is small, the relative sliding distance between the first sleeve 2 and the second sleeve 3 is less than 100. The distance between the first sleeve 2 and the second sleeve 3 is small, and the second flow hole 32, the third flow hole 33 and the fourth flow hole 34 are not separated from the first bushing 7. Since the first bushing 7 is embedded between the first sleeve 2 and the second sleeve 3, the distance between the two is small, and the flow path area of ​​the damping oil is relatively small, so the flow rate of the damping oil is reduced, thereby forming a smaller damping effect; when the impact force is large, the relative sliding movement distance between the first sleeve 2 and the second sleeve 3 is large. At this time, the second flow hole 32, the third flow hole 33 and the fourth flow hole 34 are separated from the first bushing 7 in turn as the impact force increases, and the first flow hole 31 is connected to the inside and outside of the first sleeve 2, increasing the flow path area of ​​the second flow hole 32, the third flow hole 33, the fourth flow hole 34 and the two third flow holes The damping oil flowing out of the five flow holes 35 flows into the flow path area of ​​the second volume chamber 200, thereby increasing the flow rate of the damping oil, thereby forming a larger damping effect, and the distance between the second connecting hole 32 and the piston 4 is smaller than the distance between the third connecting hole 33 and the piston 4, and the distance between the third connecting hole 33 and the piston 4 is smaller than the distance between the fourth connecting hole 34 and the piston 4. It can be adaptively adjusted according to the size of the impact force, so as to adapt to various road conditions and improve the use effect. At the same time, the flow rate of the damping oil entering and exiting the first volume chamber 100 is adjusted by the adjustment device 11, so that the adjustment damping range of the shock absorber is improved, further adapting to various road conditions and improving the use effect.

[0035] Specifically, the adjusting device 11 includes an adjusting seat 111 and an adjusting rod 112. The adjusting seat 111 is fixed on the hydraulic cylinder 1. An adjusting hole 113 is provided on the adjusting seat 111 and along the axial direction of the hydraulic cylinder 1. The lower end of the second sleeve 3 is embedded in the adjusting hole 113. The adjusting rod 112 is passed through the adjusting hole 113 and is rotatably connected to the adjusting seat 111. The adjusting rod 112 has an external thread. The upper part of the adjusting rod 112 is embedded in the second sleeve 3 and is threadedly connected to the second sleeve 3. By rotating the adjusting rod 112, the second sleeve 3 threadedly connected to the adjusting rod 112 is rotated. The sleeve 3 moves up and down along its axial direction. When the second sleeve 3 moves upward, the compression stroke of the first spring 5 is reduced, the piston 4 is separated from the first flow hole 31, and the second flow hole 32 is separated from the first bushing 7, or the second flow hole 32 and the third flow hole 33 are separated from the first bushing 7 together; when the second sleeve 3 moves downward, the compression stroke of the first spring 5 is increased, and the two fifth flow holes 35 are embedded in the adjustment seat 111; the fourth flow hole 34 is separated from the first bushing 7, so that the flow path area of ​​the damping oil in and out of the first cavity 100 changes, the flow rate changes, and the damping size of the shock absorber changes.

[0036] In addition, the first sealing cover 8 includes an end cover 81, a top ring 82, an elastic sleeve 83, a metal elastic ring 84 and a second bushing 85. The upper surface of the top ring 82 abuts against the lower end surface of the end cover 81. The upper and lower surfaces of the elastic sleeve 83 are respectively provided with an upper annular groove 86 and a lower annular groove 87. The lower end surface of the top ring 82 abuts against the upper end surface of the elastic sleeve 83. The metal elastic ring 84 is clamped on the circumferential outer surface of the elastic sleeve 83. The upper end of the second bushing 85 is embedded in the lower annular groove 87. The upper end surface of the elastic sleeve 83 is divided into an inner ring and an outer ring by the upper annular groove 86. The circumferential outer side surface of the top ring 82 is arranged in an inclined surface. The lower end surface of the top ring 82 abuts on the inner ring, and the circumferential outer side surface of the top ring 82 abuts against the outer surface of the upper annular groove 86.

[0037] In this way, when the end cover 81 is screwed into the hydraulic cylinder 1, the end cover 81 squeezes the elastic sleeve 83 through the top ring 82, so that the outer ring of the elastic sleeve 83 squeezes the inner wall of the hydraulic cylinder 1, and the outer ring squeezes the outer wall of the first sleeve 2. At the same time, the metal elastic ring 84 provided has high clamping elasticity, so that the elastic sleeve 83 is better fixed, and by being clamped in the middle, the axial ends of the elastic sleeve 83 with elasticity are slightly tilted outward, thereby improving the fit, and the second bushing 85 is embedded in the lower annular groove 87 on the lower end surface of the elastic sleeve 83, thereby improving the sealing effect of the first sealing cover 8.

[0038] Furthermore, the metal elastic ring 84 has a notch 846, and the metal elastic ring 84 includes a first curved portion 841, a second curved portion 842, a third curved portion 843, a fourth curved portion 844 and a fifth curved portion 845 that are connected in sequence. The first curved portion 841 and the second curved portion 842 are axially symmetrically distributed with the fifth curved portion 845 and the fourth curved portion 844 along the center line of the third curved portion 843. The concave surface of the first curved portion 841 faces the inner side surface, and the concave surface of the second curved portion 842 faces the outer side surface. The curvature radius of the second curved portion 482 is smaller than the curvature radius of the first curved portion 841, and the curvature radius of the first curved portion 841 is smaller than the curvature radius of the third curved portion 843.

[0039] With this design, the first curved portion 841, the third curved portion 843 and the fifth curved portion 845 support the second curved portion 842 and the fourth curved portion 844, and the elastic sleeve 83 is clamped inward by the second curved portion 842 and the fourth curved portion 844 to achieve fixation. At the same time, the notch 846 provided on the metal elastic ring 84 maintains the elastic potential energy of the metal elastic ring 84, achieves better fixed clamping, and facilitates the installation of the metal elastic ring 84. During the movement of the first sleeve 2, the diameter error of the second sleeve 3 caused by its radial runout and processing accuracy can be ensured by this design to ensure that the elastic sleeve 83 is always clamped on the outer side surface of the second sleeve 3, thereby improving the sealing effect.

[0040] In this embodiment, a fifth mounting seat 20 and a sixth mounting seat 22 in a triangular structure are respectively provided on the hydraulic cylinder 1 and located on the lower side of the second mounting seat 14. The sixth mounting seat 22 is distributed on the lower side of the fifth mounting seat 20. The cross-sectional area of ​​the sixth mounting seat 22 is larger than the cross-sectional area of ​​the fifth mounting hole 20. The fifth mounting seat 20 is provided with a fifth mounting hole 21, and the sixth mounting seat 22 is provided with a sixth mounting hole 23. The lower part of the fifth mounting seat 21 is extended with a first extension portion 24, and the first extension portion 24 is provided with a seventh mounting hole 25. The sixth mounting seat 22 is provided with a seventh mounting hole 25. A second extension portion 26 is extended from the lower portion of the mounting seat 22, and an eighth mounting hole 27 and a ninth mounting hole 28 are provided on the second extension portion 26. A first connecting hole 101 and a second connecting hole 102 are respectively provided in the middle portion of the connecting plate 10. The central axis of the first connecting hole 101 and the second connecting hole 102 is perpendicular to the central axis of the third mounting hole 17. This design facilitates the installation of the front disc brake device of the motorcycle and improves the firmness of the installation. The connection strength between the hydraulic cylinder 1 and the mounting seat is guaranteed, while reducing the mass of the hydraulic cylinder 1 and improving the handling performance of the motorcycle.

[0041] Furthermore, the hydraulic cylinder 1 is provided with reinforcing ribs 50 distributed along its axial direction, and a support block 60 is provided in the middle of the outer surface of the hydraulic cylinder 1 , thereby improving the strength of the hydraulic cylinder 1 .

[0042] In this embodiment, the piston 4 includes a piston body 41, a piston sleeve 42 and a piston end cover 43. The upper end of the piston sleeve 42 is provided with a convex ring 44 extending radially inward. The piston body 41 is embedded in the piston sleeve 42. Four protrusions 45 are provided around the upper surface of the piston body 41. A through groove 46 is formed between two adjacent protrusions 45. The upper end of each protrusion 44 abuts against the lower surface of the convex ring 45. The piston end cover 43 is covered on the convex ring 44. The piston end cover 43 has a conical surface. The inner edge is embedded between the second sleeve 3 and the convex ring 44. When the shock absorber rebounds, the damping oil in the first sleeve 2 and on the upper side of the piston 4 acts on the piston end cover 43, and is guided into the interior of the piston 4 through the piston end cover 43, flows through the through groove 46 between the convex rings 44, and squeezes the piston sleeve 42 from the inside to the outside, so that the piston sleeve 42 is separated from the piston body 41, and enters the second cavity 200. At the same time, when the shock absorber is compressed, the sealing effect of the piston 4 and the inner wall of the first sleeve 2 can be ensured, thereby improving the shock absorption effect of the shock absorber.

[0043] Although the present invention has been particularly shown and described in conjunction with preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made to the present invention without departing from the spirit and scope of the invention as defined in the appended claims, and all such changes are within the scope of protection of the present invention.

Claims

1. A motorcycle front fork shock absorber, characterized in that: The hydraulic cylinder comprises a first sleeve, a second sleeve, a piston, a first spring, a second spring, a first bushing, a first sealing cover, a second sealing cover, a connecting plate and an adjusting device. The lower end of the hydraulic cylinder is provided with a first mounting seat, the first mounting seat is provided with a first mounting hole extending in the radial direction of the hydraulic cylinder, the upper part of the hydraulic cylinder and located on both sides of the radial direction of the hydraulic cylinder are respectively provided with a second mounting seat and a third mounting seat, the second mounting seat is provided with a second mounting hole, the third mounting seat is provided with a third mounting hole, the middle part of the hydraulic cylinder and on the same side as the third mounting seat are provided with a fourth mounting seat, the The fourth mounting seat is provided with a fourth mounting hole, and the upper and lower ends of the connecting plate are respectively locked on the third mounting seat and the fourth mounting seat by bolts, the first sealing cover is provided on the upper end of the hydraulic cylinder, and the adjusting device is provided on the lower part of the hydraulic cylinder, the first sleeve is passed through the hydraulic cylinder, and the upper end of the first sleeve extends outward through the first sealing cover, the second sealing cover is provided on the upper end of the first sleeve, the lower part of the first sleeve and a first communicating hole is provided in the hydraulic cylinder, the second sleeve is passed through the first sleeve, the lower end of the second sleeve passes through the first sleeve and is connected to the adjusting device, the second A support ring is provided at the upper end of the sleeve, the piston is provided on the second sleeve and distributed in the first sleeve, the upper part of the second sleeve and located in the first sleeve are respectively provided with a second communicating hole, a third communicating hole and a fourth communicating hole, the second communicating hole, the third communicating hole and the fourth communicating hole are distributed on the lower side of the piston, the distance between the second communicating hole and the piston is smaller than the distance between the third communicating hole and the piston, the distance between the third communicating hole and the piston is smaller than the distance between the fourth communicating hole and the piston, the lower part of the second sleeve is provided with two fifth communicating holes, the first bushing is provided between the first sleeve and the second sleeve The first spring is inserted into the first sleeve, and the two ends of the first spring respectively abut against the second sealing cover and the support ring. The second spring is sleeved on the second sleeve, and the two ends of the second spring are respectively connected to the support ring and the piston. A first volume cavity is formed by the second sealing cover, the first sleeve, the second sleeve, the piston and the adjusting device. A second volume cavity is formed by the first sealing cover, the hydraulic cylinder, the first sleeve, the second sleeve and the piston. The first volume cavity and the second volume cavity are both filled with damping oil. The flow rate of the damping oil in and out of the first volume cavity is adjusted by the adjusting device. The adjusting device includes an adjusting seat and an adjusting rod. The adjusting seat is fixed on the hydraulic cylinder. An adjusting hole is provided on the adjusting seat along the axial direction of the hydraulic cylinder. The lower end of the second sleeve is embedded in the adjusting hole. The adjusting rod is passed through the adjusting hole and is rotatably connected to the adjusting seat. The adjusting rod has an external thread. The upper part of the adjusting rod is embedded in the second sleeve and is threadedly connected to the second sleeve.

2. The motorcycle front fork shock absorber according to claim 1, characterized in that: The first sealing cover includes an end cover, a top ring, an elastic sleeve, a metal elastic ring and a second bushing. The upper surface of the top ring abuts against the lower end surface of the end cover. The upper surface and lower surface of the elastic sleeve are respectively provided with an upper annular groove and a lower annular groove. The lower end surface of the top ring abuts against the upper end surface of the elastic sleeve. The metal elastic ring is clamped on the circumferential outer surface of the elastic sleeve. The upper end of the second bushing is embedded in the lower annular groove.

3. The motorcycle front fork shock absorber according to claim 2, characterized in that: The upper end surface of the elastic sleeve is divided into an inner ring and an outer ring by an upper annular groove. The circumferential outer side surface of the top ring is arranged as an inclined surface. The lower end surface of the top ring abuts against the inner ring, and the circumferential outer side surface of the top ring abuts against the outer side surface of the upper annular groove.

4. The motorcycle front fork shock absorber according to claim 3, characterized in that: The metal elastic ring has a notch, and includes a first curved portion, a second curved portion, a third curved portion, a fourth curved portion, and a fifth curved portion that are integrally connected in sequence. The first curved portion and the second curved portion are axially symmetrically distributed with the fifth curved portion and the fourth curved portion along the center line of the third curved portion. The concave surface of the first curved portion faces the inner side surface, and the concave surface of the second curved portion faces the outer side surface. The curvature radius of the second curved portion is smaller than the curvature radius of the first curved portion, and the curvature radius of the first curved portion is smaller than the curvature radius of the third curved portion.

5. The motorcycle front fork shock absorber according to any one of claims 1 to 4, characterized in that: A fifth mounting seat and a sixth mounting seat in a triangular structure are respectively provided on the hydraulic cylinder and located on the lower side of the second mounting seat. The sixth mounting seat is distributed on the lower side of the fifth mounting seat. The cross-sectional area of ​​the sixth mounting seat is larger than the cross-sectional area of ​​the fifth mounting hole. The fifth mounting seat is provided with a fifth mounting hole, and the sixth mounting seat is provided with a sixth mounting hole.

6. The motorcycle front fork shock absorber according to claim 5, characterized in that: A first extension portion is extended from the lower portion of the fifth mounting seat, and a seventh mounting hole is provided on the first extension portion.

7. The motorcycle front fork shock absorber according to claim 6, characterized in that: A second extension portion is extended from the lower portion of the sixth mounting seat, and an eighth mounting hole and a ninth mounting hole are formed on the second extension portion.

8. The motorcycle front fork shock absorber according to claim 7, characterized in that: The hydraulic cylinder is provided with reinforcing ribs distributed along its axial direction.

9. The motorcycle front fork shock absorber according to claim 8, characterized in that: A first connecting hole and a second connecting hole are respectively provided in the middle of the connecting plate, and the central axes of the first connecting hole and the second connecting hole are perpendicular to the central axis of the third mounting hole.

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