Buffer body structure of chain wheel seat of large-displacement motorcycle and mounting method

Abstract

The invention belongs to the technical field of motorcycle driving, and particularly relates to a large-displacement motorcycle chain wheel seat buffer body structure and an installation method.The large-displacement motorcycle chain wheel seat buffer body structure comprises a chain wheel seat buffer body assembly and an integral type rim combination, and the chain wheel seat buffer body assembly is installed on the integral type rim combination in the mode that five hexagon socket screws penetrate through round through holes of a buffer body base; a rear wheel shaft penetrates through the center of the chain wheel base buffer body assembly and the center of the integral type rim combination and is locked and fixed through a rear wheel shaft locking nut, and a rear tire is installed on the outer side of the integral type rim combination. The chain wheel seat buffer body assembly comprises a chain wheel seat combination, five buffer rubber sleeve bushings and a buffer body base; according to the chain wheel buffering body, the novel structural design is utilized, the buffering body base is separated from the rear hub and serves as an independent part, maintenance is convenient, only the buffering body base needs to be replaced, and the whole rear rim and hub assembly does not need to be replaced.

Description

Technical Field

[0001] The invention belongs to the technical field of motorcycle driving, and in particular relates to a sprocket seat buffer body structure of a large-displacement motorcycle and an installation method thereof. Background Art

[0002] The motorcycle is rear-wheel driven, consisting of a driving sprocket on the engine output shaft, a chain and a driven sprocket (rear sprocket) mounted on the rear wheel hub. Its position and function: On a motorcycle, the sprocket usually works with the chain to transmit the engine's power to the rear wheel. Specifically, the driving sprocket (also called the front sprocket) and the driven sprocket (also called the rear sprocket) are connected and driven by a chain.

[0003] When the chain and driven sprocket transmit power, if the driving sprocket is directly installed on the rear wheel hub to form an integrated rigid connection, when the motorcycle is accelerating or decelerating, the impact of the instantaneous torque will damage the chain. At the same time, the friction between the tire and the ground will cause serious damage to the rear wheel net and even damage the rear wheel hub and the internal bearings.

[0004] Therefore, a sprocket buffer body is required on the driven sprocket of the rear wheel drive of a large displacement motorcycle, and a buffer rubber block is installed on the rear wheel hub as a buffer device, which buffers the impact force transmitted by the chain to the rear wheel hub to prevent damage to the rear wheel hub and the internal bearing of the motorcycle due to excessive impact force. It can reduce the hard collision between the rear wheel and the frame, extend the service life of the vehicle, and improve driving stability, providing the rider with a more reliable sense of control.

[0005] The existing technology is to install a buffer rubber block on the rear wheel hub, and the buffer bushing is directly pressed onto the rear wheel hub with an interference fit on the outer ring. The disadvantage is that it is inconvenient to repair when replacing the buffer bushing. The rear wheel hub is easily damaged when the buffer bushing is removed, and the entire rear wheel net assembly may even need to be removed for repair. In addition, this method requires high precision in the fitting clearance. If the clearance is large, the transmission effect is poor, the entire buffer rubber block is easily damaged, and the probability of repair is high. When the driven sprocket rotates and is subjected to the tension of the chain, it only relies on the bearing on the rear wheel rim hub as the force, which easily causes the bearing damage rate on the hub and a high repair rate.

[0006] In order to solve the above problems, the present application proposes a buffer body structure and installation method for a sprocket seat of a large-displacement motorcycle. Summary of the invention

[0007] In order to solve the problems raised in the above background technology, the present invention provides a large-displacement motorcycle sprocket seat buffer body structure and installation method, which has the characteristics of easy installation, easy disassembly, replacement and maintenance.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a large-displacement motorcycle sprocket seat buffer body structure, comprising a sprocket seat buffer body assembly and an integral rim assembly, wherein the sprocket seat buffer body assembly is installed on the integral rim assembly by passing through the circular through holes of the buffer body base with five hexagon socket bolts, a rear wheel axle passes through the center of the sprocket seat buffer body assembly and the integral rim assembly, and is locked and fixed by a rear wheel axle locking nut, and a rear tire is installed on the outer side of the integral rim assembly; the sprocket seat buffer body assembly comprises a sprocket seat The sprocket seat assembly is composed of a T-type bushing I, a dustproof sealing ring, an inner retaining ring for the hole, five locking nuts, a sprocket seat body, a driven sprocket, a bearing I, a T-type bushing II, a step bushing, a bearing II, a U-shaped groove bracket, and special bolts for sprockets. The buffer rubber sleeve bushing is composed of a steel bushing on the inner ring and a buffer rubber sleeve on the outer ring. The sprocket seat assembly is inserted into the steel bushing through the special bolts for sprockets, and the buffer rubber sleeve is inserted into the cylindrical hole of the buffer body base.

[0009] As a preferred structure of a buffer body for a sprocket seat of a large-displacement motorcycle of the present invention, the sprocket seat body is designed with a groove, a cylindrical inner hole and a step hole, a sprocket mounting step surface, a sprocket bolt mounting hole, and a mounting end face cylindrical hole.

[0010] As a preferred structure of a buffer body for a sprocket seat of a large-displacement motorcycle of the present invention, the integral rim assembly is composed of an aluminum alloy rim, a second bearing, a third bearing, and a spacer sleeve, and a threaded hole is provided on the aluminum alloy rim.

[0011] As a preferred structure of a buffer body for a sprocket seat of a large-displacement motorcycle of the present invention, the steel bushing is made of Q235 common carbon structural steel and is heat-treated, and the buffer rubber sleeve is a rubber sleeve structure made of polybutadiene with a Shore A hardness of 55±3.

[0012] As a preferred structure of a buffer body for a sprocket seat of a large-displacement motorcycle of the present invention, the U-shaped groove bracket is a plum blossom-shaped five-petal structure, each petal is provided with a U-shaped groove, and the sprocket-specific bolt is a multi-layer step structure and is formed with a boss matching the structure.

[0013] As a preferred structure of a buffer body for a sprocket seat of a large-displacement motorcycle of the present invention, the sprocket-specific bolt comprises a stepped cylindrical rod and a threaded rod, and the cylindrical rod and the inner surface of the steel bushing serve as a transition fit.

[0014] Also included is a method for installing a sprocket seat buffer structure of a large-displacement motorcycle, comprising the following steps: S1, assembling a driven sprocket and a sprocket seat assembly, specifically comprising: S11. Pressing assembly of sprocket seat assembly: first, place a step bushing into the cylindrical inner hole and the step hole of the sprocket seat body, press bearing II onto the step bushing with a hydraulic press, then place a T-type bushing II and a bearing I into the cylindrical inner hole and press them into place with a hydraulic press, then use a circlip pliers to install a hole inner circlip into the groove as an axial limit for bearing I and bearing II, finally install a dustproof seal ring into the cylindrical hole of the installation end face of the sprocket seat body, and clamp the T-type bushing I on the inner side of the dustproof seal ring; S12. Assemble the driven sprocket and the U-shaped groove bracket: first, place a driven sprocket on the sprocket mounting step surface of the sprocket seat body, so that the five sprocket bolt mounting holes correspond to the through holes of the driven sprocket, then fit the surface of the U-shaped groove bracket to the plane of one side of the driven sprocket, and then use one end of the threaded rods of the five sprocket special bolts to pass through the five U-shaped grooves of the U-shaped groove bracket, the five holes of the driven sprocket, and the five sprocket bolt mounting holes on the sprocket seat body in sequence, and then lock and fix them with the locking nuts; S2. Installation of the buffer body base and buffer rubber sleeve bushing, specifically including: S21. Assembly of the buffer body base and the integral wheel rim assembly: Use five hexagon socket head bolts to pass through the circular through holes of the buffer body base to fasten the buffer body base to the five threaded holes of the integral wheel rim assembly.

[0015] S22, place five buffer rubber bushings in the five cylindrical holes of the buffer body base respectively; S3. Assembly of the sprocket seat assembly and the buffer rubber sleeve bushing: insert the cylindrical rods of the five sprocket-specific bolts on the sprocket seat assembly into the corresponding steel bushing holes of the inner rings of the five buffer rubber sleeve bushings, then pass the rear wheel axle through the integral rim assembly, pre-tighten it with the rear wheel axle locking nut, and then install it on the corresponding hole position of the rear wheel assembly of the rear fork of the vehicle and lock it.

[0016] As a preferred method for installing a sprocket seat buffer structure of a large-displacement motorcycle of the present invention, the U-shaped groove bracket is designed with plane I, plane II, and arc surface as limiting surfaces, and the sprocket-specific bolt is designed with a multi-layer step shape, and the installation surfaces corresponding to the sprocket-specific bolt are as follows: 1. The stepped vertical surface I of the sprocket-specific bolt is installed on the plane I of the U-shaped groove bracket; 2. The stepped vertical surface II of the sprocket-specific bolt is installed on the plane II of the U-shaped groove bracket; 3. The arc surface of the sprocket-specific bolt is installed on the step arc surface of the U-shaped groove bracket; 4. The step surface of the sprocket-specific bolt is installed to fit the large plane of the U-shaped groove bracket.

[0017] Compared with the prior art, the present invention has the following beneficial effects: The sprocket buffer body of the present invention utilizes a new structural design, and the buffer body base is separated from the rear wheel hub as a separate part, which is easy to maintain. Only the buffer body seat needs to be replaced, and there is no need to replace the entire rear wheel rim and wheel hub assembly.

[0018] The newly-designed U-groove bracket for the sprocket mounting bolt is designed in a five-petal plum blossom shape. A U-groove is designed at each petal position to fix the corresponding bolt during installation and prevent circumferential rotation when the bolt is tightened.

[0019] The cylindrical buffer sleeve with a new structure is made of two materials. The inner ring is made of a steel tube bushing structure, and the outer ring is made of a rubber sleeve structure, which has a better buffering effect. It is installed in conjunction with the buffer body seat as a transition without the need for a complex press-fitting process using an oil hydraulic press. It is easy to repair and replace, and has a low maintenance cost.

[0020] The new structure of the driven sprocket mounting seat cylindrical inner hole is designed to install two deep groove ball bearings and two T-type bushings and a step bushing structure; the load-bearing capacity is enhanced to reduce the load capacity of the bearing on the rim; the driven sprocket is installed between the sprocket mounting seat and the buffer body base to ensure that the sprocket is evenly stressed and the sprocket is stressed on double bearings (two deep groove ball bearings). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings: Figure 1 It is a schematic diagram of the appearance structure of the present invention; Figure 2 It is a front structural schematic diagram of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the cross-sectional structure at AA; Figure 4 It is a schematic diagram of the installation structure of the sprocket seat assembly and the buffer rubber sleeve bushing of the present invention; Figure 5 It is a schematic diagram of the component installation structure of the present invention; Figure 6 It is a schematic diagram of the specific parts installation structure of the present invention; Figure 7 It is a schematic diagram of the installation structure of the U-shaped groove bracket and the sprocket special bolt in the present invention; Figure 8 It is a schematic diagram of the installation structure of the sprocket seat assembly, the buffer rubber sleeve bushing and the buffer body base in the present invention; Fig. 9 For the present invention Figure 3 A partial enlarged view of Fig.10It is a schematic cross-sectional structure diagram of the sprocket seat body in the present invention; In the figure: 10, hexagon socket bolt; 11, rear tire; 12, rear wheel shaft locking nut; 13, rear wheel shaft; 1100, sprocket seat buffer body assembly; 100, sprocket seat assembly; 101, T-type bushing I; 102, dustproof seal ring; 103, inner clamping spring for hole; 104, T-type bushing II; 105, step bushing; 110, locking nut; 120, bearing I; 130, bearing II; 140, sprocket special bolt; 141, step vertical surface I; 142, step vertical surface II; 143, step surface; 144, step arc surface; 145, cylindrical rod; 146, threaded rod; 150, sprocket seat body; 151, groove ;152, inner hole of cylinder;153, step hole;154, sprocket mounting step surface;155, sprocket bolt mounting hole;156, mounting end face cylindrical hole;160, driven sprocket;170, U-shaped groove bracket;171, plane I;172, plane II;173, large plane;174, arc surface;200, buffer rubber sleeve bushing;201, steel bushing;202, buffer rubber sleeve;300, buffer body base;301, cylindrical hole;302, circular through hole in buffer body base;400, integral rim assembly;401, aluminum alloy rim;402, bearing two;403, bearing three;404, spacer;405, threaded hole. DETAILED DESCRIPTION

[0022] 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.

[0023] In order to solve the problem of damage to the bearing inside the rear wheel hub caused by the impact force of a large-displacement motorcycle when it is running under high torque and high power, the present invention improves the structure of the buffer body and the buffer rubber sleeve of the large-displacement motorcycle, separates a buffer body base from the rear wheel hub to install the buffer rubber sleeve, and the buffer rubber sleeve adopts an inner ring steel bushing and an outer ring rubber sleeve structure. The inner ring steel bushing is wear-resistant, and the buffer rubber sleeve also plays a key role in protecting the vehicle. An additional U-shaped groove fixing bracket is used for fixing the sprocket mounting bolts and can also prevent circumferential rotation when tightening the locking nut.

[0024] A double bearing and three bushings, namely, two T-shaped bushings and one step bushing, are designed in the cylindrical hole of the sprocket mounting seat. The step bushing is installed to contact a bearing of the rear wheel hub.

[0025] The driven sprocket is installed between the sprocket mounting seat and the buffer body base to ensure that the sprocket is evenly stressed and the force of the sprocket is applied to the two deep groove ball bearings of the double bearings, thereby solving the above-mentioned problem.

[0026] like Figures 1 to 10 As shown; A large-displacement motorcycle sprocket seat buffer body structure, including a sprocket seat buffer body assembly 1100 and an integral rim assembly 400, the sprocket seat buffer body assembly 1100 is installed on the integral rim assembly 400 through five hexagon socket bolts 10 passing through the circular through hole 302 of the buffer body base, the rear wheel axle 13 passes through the center of the sprocket seat buffer body assembly 1100 and the integral rim assembly 400, and is locked and fixed by the rear wheel axle locking nut 12, and the rear tire 11 is installed on the outer side of the integral rim assembly 400; the sprocket seat buffer body assembly 1100 includes the sprocket seat assembly 100, five buffer rubber sleeves 200 and the buffer body base 30 0; the sprocket seat assembly 100 is composed of a T-type bushing I101, a dustproof sealing ring 102, an inner retaining ring 103 for the hole, five locking nuts 110, a sprocket seat body 150, a driven sprocket 160, a bearing I120, a T-type bushing II104, a step bushing 105, a bearing II130, a U-shaped groove bracket 170, and a sprocket-specific bolt 140. The buffer rubber sleeve bushing 200 is composed of an inner ring steel bushing 201 and an outer ring buffer rubber sleeve 202. The sprocket seat assembly 100 is inserted into the steel bushing 201 through the sprocket-specific bolt 140, and the buffer rubber sleeve 202 is inserted into the cylindrical hole 301 of the buffer body base 300.

[0027] In this embodiment: the integral rim assembly 400 of the present invention is connected to the sprocket seat assembly 100 through the buffer rubber sleeve bushing 200 and the buffer body base 300, wherein the sprocket seat assembly 100 receives the torque transmitted by the driving sprocket and the chain through the sprocket special bolt 140 and the driven sprocket 160. When accelerating, the driven sprocket 160 and the sprocket seat body 150 rotate counterclockwise, driving the integral rim assembly 400 to rotate counterclockwise. When decelerating or shifting gears, the rear wheel speed decreases or is affected by the braking force, and the rear wheel will generate a clockwise torque. At this time, the sprocket seat buffer body assembly 1100 and the cylindrical rod 145 of the sprocket bolt and the buffer body base 300 will play a buffering role when they collide with each other. The sprocket seat buffer body assembly 1100 of the present invention is plug-in during installation, and the installation and disassembly are convenient and quick, and it is easy to repair and replace.

[0028] More specifically: In an optional embodiment, the sprocket seat body 150 is designed with a groove 151, a cylindrical inner hole 152 and a step hole 153, a sprocket mounting step surface 154, a sprocket bolt mounting hole 155, and a mounting end face cylindrical hole 156.

[0029] In this embodiment: Fig. 9 and Fig.10 As shown, the sprocket seat body 150 of this structure makes the sprocket seat assembly 100 compact and the driven sprocket 160 firmly installed.

[0030] Going further: In an optional embodiment, the integral wheel rim assembly 400 is composed of an aluminum alloy wheel rim 401, a second bearing 402, a third bearing 403, and a spacer 404. A threaded hole 405 is provided on the aluminum alloy wheel rim 401.

[0031] Going further: In an optional embodiment, the steel bushing 201 is made of Q235 common carbon structural steel and is heat treated, and the buffer rubber sleeve 202 is made of a rubber sleeve structure, and the material is polybutadiene with a Shore A hardness of 55±3.

[0032] Going further: In an optional embodiment, the U-shaped groove bracket 170 is a plum blossom-shaped five-petal structure, each petal is provided with a U-shaped groove, and the sprocket-specific bolt 140 is a multi-layer step structure and is formed with a boss matching 170 .

[0033] In the present embodiment: through this design, through the five-petal U-groove bracket 170 and the five sprocket-specific bolts 140, the driven sprocket 160 can be better fixed, the force is balanced, and the circumferential displacement is prevented. The five buffer rubber sleeve bushings 200 evenly bear the circumferential force, reducing the pressure borne by a single buffer rubber sleeve bushing 200 and improving durability.

[0034] Going further: In an optional embodiment, the sprocket-specific bolt 140 includes a step surface 143, a cylindrical rod 145 and a threaded rod 146, the cylindrical surface of the cylindrical rod 145 serves as a working surface, and the cylindrical rod 145 and the inner surface of the steel bushing 201 serve as a transition fit.

[0035] In this embodiment: through this design, the edge of the cylindrical rod 145 and the plane where the hexagon socket bolt 10 is located are fitted and staggered, such as Figure 2 As shown, when a circumferential force occurs, the cylindrical rod 145 applies a force to the buffer body base 300, and the buffer body base 300 applies a force to the integral rim assembly 400 through the hexagon socket bolt 10. The buffering effect of the buffer body base 300 prevents the impact force from directly acting on the integral rim assembly 400, thereby achieving an improved buffering effect.

[0036] A method for installing a sprocket seat buffer structure of a large-displacement motorcycle comprises the following steps: S1. The assembly of the driven sprocket 160 and the sprocket seat assembly 100 specifically includes: S11. Pressing and installing the sprocket seat assembly 100: first, place a step bushing 105 into the cylindrical inner hole 152 and the step hole 153 of the sprocket seat body 150, press the bearing II 130 onto the step bushing 105 with a hydraulic press, then place a T-shaped bushing II 104 and a bearing I 120 into the cylindrical inner hole 152 and press them into place with a hydraulic press, then use a circlip pliers to install a hole inner circlip 103 into the groove 151 as an axial limit for the bearing I 120 and the bearing II 130, finally install a dustproof seal ring 102 into the cylindrical hole 156 of the mounting end face of the sprocket seat body 150, and snap the T-shaped bushing I 101 onto the inner side of the dustproof seal ring 102; S12, assembling the driven sprocket 160 and the U-shaped groove bracket 170: first, put a driven sprocket 160 into the sprocket mounting step surface 154 of the sprocket seat body 150, so that the five sprocket bolt mounting holes 155 correspond to the through holes of the driven sprocket 160, then fit the surface of the U-shaped groove bracket 170 with the plane of one side of the driven sprocket 160, and then use one end of the threaded rod 146 of the five sprocket special bolts 140 to pass through the five U-shaped grooves of the U-shaped groove bracket 170, the five holes of the driven sprocket 160 and the five sprocket bolt mounting holes 155 on the sprocket seat body 150 in sequence, and then lock and fix them with the locking nut 110; S2, the installation of the buffer body base 300 and the buffer rubber sleeve 200 specifically includes: S21, assembling the buffer body base 300 and the integral wheel rim assembly 400: fasten the buffer body base 300 to the five threaded holes 405 of the integral wheel rim assembly 400 with five hexagon socket head bolts 10 respectively penetrating the circular through holes 302 of the buffer body base.

[0037] S22, placing five buffer rubber sleeves 200 in the five cylindrical holes 301 of the buffer body base 300 respectively; S3. Assembly of the sprocket seat assembly 100 and the buffer rubber sleeve bushing 200: insert the cylindrical rods 145 of the five sprocket-specific bolts 140 on the sprocket seat assembly 100 into the corresponding holes of the steel bushing 201 of the inner ring of the five buffer rubber sleeve bushings 200, and then pass the rear wheel axle 13 through the integral rim assembly 400, and install it on the corresponding hole position of the rear wheel assembly of the rear fork of the whole vehicle after pre-tightening with the rear wheel axle locking nut 12 and locking it.

[0038] In this embodiment: the U-shaped groove bracket 170 is designed with a plane I171, a plane II172, and an arc surface 174 as limiting surfaces, and the sprocket-specific bolt 140 is designed with a multi-layer step shape. The installation surfaces corresponding to the sprocket-specific bolt 140 are as follows: 1. The stepped vertical surface I141 of the sprocket-specific bolt 140 is installed on the plane I171 of the U-shaped groove bracket 170; 2. The stepped vertical surface II142 of the sprocket-specific bolt 140 is installed on the plane II172 of the U-shaped groove bracket 170; 3. The arc surface 174 of the sprocket-specific bolt 140 is installed on the step arc surface 144 of the U-shaped groove bracket 170; 4. The step surface 143 of the sprocket-specific bolt 140 is installed to fit with the large plane 173 of the U-shaped groove bracket 170 .

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A buffer structure for a sprocket seat of a large-displacement motorcycle, characterized in that: The invention comprises a sprocket seat buffer body assembly (1100) and an integral wheel rim assembly (400); the sprocket seat buffer body assembly (1100) is installed on the integral wheel rim assembly (400) by means of five hexagon socket bolts (10) passing through circular through holes (302) of a buffer body base; a rear wheel axle (13) passes through the centers of the sprocket seat buffer body assembly (1100) and the integral wheel rim assembly (400) and is locked and fixed by means of a rear wheel axle locking nut (12); a rear tire (11) is installed on the outer side of the integral wheel rim assembly (400); the sprocket seat buffer body assembly (1100) comprises a sprocket seat assembly (100), five buffer rubber sleeves (200) and a buffer body base (300); the sprocket seat assembly (100) is composed of a T-shaped The sprocket assembly (100) is composed of a bushing I (101), a dustproof sealing ring (102), an inner retaining ring for a hole (103), five locking nuts (110), a sprocket seat body (150), a driven sprocket (160), a bearing I (120), a T-type bushing II (104), a step bushing (105), a bearing II (130), a U-shaped groove bracket (170), and a sprocket-specific bolt (140). The buffer rubber sleeve bushing (200) is composed of an inner ring steel bushing (201) and an outer ring buffer rubber sleeve (202). The sprocket seat assembly (100) is inserted into the steel bushing (201) through the sprocket-specific bolt (140), and the buffer rubber sleeve (202) is inserted into the cylindrical hole (301) of the buffer body base (300).

2. The large displacement motorcycle sprocket seat buffer structure according to claim 1, characterized in that: The sprocket seat body (150) is designed with a groove (151), a cylindrical inner hole (152) and a step hole (153), a sprocket mounting step surface (154), a sprocket bolt mounting hole (155), and a mounting end surface cylindrical hole (156).

3. The large displacement motorcycle sprocket seat buffer structure according to claim 2, characterized in that: The integral wheel rim assembly (400) is composed of an aluminum alloy wheel rim (401), a second bearing (402), a third bearing (403), and a spacer (404); a threaded hole (405) is provided on the aluminum alloy wheel rim (401).

4. The large displacement motorcycle sprocket seat buffer structure according to claim 1, characterized in that: The steel bushing (201) is made of Q235 common carbon structural steel and is heat treated. The buffer rubber sleeve (202) is made of a rubber sleeve structure and is made of polybutadiene with a Shore A hardness of 55±3.

5. The large displacement motorcycle sprocket seat buffer structure according to claim 1, characterized in that: The U-shaped groove bracket (170) is a plum blossom-shaped five-petal structure, each petal is provided with a U-shaped groove, and the sprocket-specific bolt (140) is a multi-layer step structure and is formed with a boss matching the (170).

6. The large displacement motorcycle sprocket seat buffer structure according to claim 5, characterized in that: The sprocket-specific bolt (140) comprises a stepped surface (143), a cylindrical rod (145) and a threaded rod (146), and the cylindrical rod (145) and the inner surface of the steel bushing (201) are used as a transition fit.

7. A method for installing a sprocket seat buffer structure for a large-displacement motorcycle, applied to the sprocket seat buffer structure for a large-displacement motorcycle as claimed in any one of claims 1 to 6, characterized in that: The following steps are included: S1. The assembly of the driven sprocket (160) and the sprocket seat assembly (100) specifically includes: S11. Pressing the sprocket seat assembly (100): first, insert a step bushing (105) into the cylindrical inner hole (152) and the step hole (153) of the sprocket seat body (150), press the bearing II (130) onto the step bushing (105) by using a hydraulic press, then insert a T-type bushing II (104) and a bearing I (120) into the cylindrical inner hole (152) and press them into place by using a hydraulic press, then use a circlip pliers to install a hole inner circlip (103) into the groove (151) to serve as an axial limit for the bearing I (120) and the bearing II (130), finally, install a dustproof seal (102) into the cylindrical hole (156) of the mounting end face of the sprocket seat body (150), and snap the T-type bushing I (101) onto the inner side of the dustproof seal (102); S12, assembling the driven sprocket (160) and the U-shaped groove bracket (170): first, place a driven sprocket (160) on the sprocket mounting step surface (154) of the sprocket seat body (150), so that the five sprocket bolt mounting holes (155) correspond to the through holes of the driven sprocket (160), then fit the surface of the U-shaped groove bracket (170) with the plane of one side of the driven sprocket (160), and then use one end of the threaded rod (146) of five sprocket special bolts (140) to pass through the five U-shaped grooves of the U-shaped groove bracket (170), the five holes of the driven sprocket (160) and the five sprocket bolt mounting holes (155) on the sprocket seat body (150) in sequence, and then lock and fix them with the locking nut (110); S2, installation of the buffer body base (300) and the buffer rubber sleeve bushing (200), specifically including: S21, assembling the buffer body base (300) and the integral wheel rim assembly (400): using five hexagon socket head bolts (10) to pass through the circular through holes (302) of the buffer body base to fasten the buffer body base (300) to the five threaded holes (405) of the integral wheel rim assembly (400); S22, placing five buffer rubber sleeve bushings (200) in the five cylindrical holes (301) of the buffer body base (300) respectively; S3, assembly of the sprocket seat assembly (100) and the buffer rubber sleeve bushing (200): insert the cylindrical rods (145) of the five sprocket special bolts (140) on the sprocket seat assembly (100) into the corresponding holes of the steel bushings (201) on the inner rings of the five buffer rubber sleeve bushings (200), and then pass the rear wheel axle (13) through the integral wheel rim assembly (400), and install it on the corresponding hole position of the rear wheel assembly of the rear fork of the whole vehicle after pre-tightening with the rear wheel axle locking nut (12) and locking it.

8. The method for installing the sprocket seat buffer structure of a large-displacement motorcycle according to claim 7, characterized in that: The U-shaped groove bracket (170) is designed with a plane I (171), a plane II (172), and an arc surface (174) as limiting surfaces, and the sprocket-specific bolt (140) is designed with a multi-layer step shape. The mounting surfaces corresponding to the sprocket-specific bolt (140) are respectively as follows: The stepped vertical surface I (141) of the sprocket-specific bolt (140) is mounted on the plane I (171) of the U-shaped groove bracket (170); The stepped vertical surface II (142) of the sprocket-specific bolt (140) is mounted on the plane II (172) of the U-shaped groove bracket (170); The arc surface (174) of the sprocket-specific bolt (140) is mounted on the stepped arc surface (144) of the U-shaped groove bracket (170); The step surface (143) of the sprocket-specific bolt (140) is installed to fit the large plane (173) of the U-shaped groove bracket (170).

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