Multi-connecting-rod transmission system

Abstract

The utility model discloses a multi-connecting-rod transmission system which comprises a driving wheel rocker arm shaft, a rear wheel rocker arm, a frame, a driving hub and a rear wheel rocker arm switching block, a third sleeve is arranged in the middle of the frame, the driving wheel rocker arm shaft penetrates through and is rotationally installed in the third sleeve, and the rear wheel rocker arm switching block is provided with three installation holes located in the vertex positions of a triangle. The upper end of the frame is rotationally connected with a mounting hole located in the upper side of the rear wheel rocker arm adapter block, the rear wheel rocker arm comprises a rear wheel rocker arm lower fork and a rear wheel rocker arm upper fork, the right end of the rear wheel rocker arm lower fork is rotationally connected with the right end of the rear wheel rocker arm upper fork, and the right end of the rear wheel rocker arm upper fork is further rotationally mounted on a driving hub. The left end of the rear wheel rocker arm lower fork is rotationally connected with the driving wheel rocker arm shaft, the left end of the rear wheel rocker arm upper fork is rotationally connected with a mounting hole located below the right side of the rear wheel rocker arm adapter block, and a mounting hole located in the left side of the rear wheel rocker arm adapter block is used for mounting a damping assembly. According to the multi-connecting-rod transmission system, a four-connecting-rod movement mechanism is formed among the rear wheel rocker arm lower fork, the rear wheel rocker arm upper fork, the rear wheel rocker arm switching block and the frame, so that compared with a traditional two-wheel belt or chain transmission type rear wheel rocker arm connecting structure, the rear wheel rocker arm connecting structure has the advantages that the structure is simple; the motion stroke range of a rear wheel rocker arm connecting structure (a bicycle rear suspension system) is greatly expanded, so that the buffering performance and the shock absorption effect of the whole bicycle are remarkably improved, and the riding comfort is improved; and the device is wide in application range and is suitable for off-road bicycles, two-wheeled electric vehicles and two-wheeled motorcycles.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycle rear suspension systems, in particular to a multi-link transmission system. Background Art

[0002] A bicycle rear suspension system improves the riding comfort of a bicycle by allowing the bicycle's rear wheel to follow the terrain to a certain extent, and in particular for mountain bikes, by reducing the vibration effects felt on so-called "hardtail" mountain bikes (i.e. bicycles without a rear suspension system) when traversing uneven terrain. Figure 1 As shown, a traditional two-wheel transmission member two-transmission rear wheel rocker arm connection structure includes a rear wheel rocker arm 3a of a triangular frame structure, the front end of the rear wheel rocker arm 3a is rotatably mounted on the rocker arm shaft 2a, and the rear end is rotatably mounted on the wheel hub end of the rear wheel 4a, and the upper vertex of the rear wheel rocker arm 3a is rotatably connected to the rear shock absorber assembly mounting hole 1a. Since the rear wheel rocker arm is an integral structural frame, the travel range of the rear wheel is restricted by the travel range of the rear shock absorber assembly, so that the travel displacement of the rear wheel rocker arm is only the travel range of the rear shock absorber assembly, which results in the rear wheel travel distance range not being large enough, resulting in low buffering performance of the rear wheel and poor shock absorption effect. To this end, the utility model proposes a multi-link transmission system in order to solve the above technical problems. Summary of the invention

[0003] The purpose of the utility model is to overcome the defects in the prior art and provide a multi-link transmission system, in which a four-link motion mechanism is formed between a rear wheel rocker arm lower fork, a rear wheel rocker arm upper fork, a rear wheel rocker arm adapter block and a frame, thereby greatly improving the motion range of the rear wheel rocker arm connection structure (bicycle rear suspension system) compared with the traditional two-wheel belt or chain drive type rear wheel rocker arm connection structure, thereby significantly improving the buffering performance and shock absorption effect of the whole vehicle and improving the riding comfort; the utility model has a wide range of applications, and is applicable to off-road bicycles, two-wheel electric vehicles and two-wheel motorcycles; the overall structural design is simple, the production and processing difficulty is low, the component cost is low, and the economy and practicality are strong.

[0004] To achieve the above-mentioned purpose, the technical solution of the utility model is to design a multi-link transmission system, including a driving wheel rocker arm shaft, a rear wheel rocker arm, a frame, a driving wheel hub and a rear wheel rocker arm adapter block, the frame having a sleeve three in the middle portion, the driving wheel rocker arm shaft passing through and rotatably installed inside the sleeve three, the rear wheel rocker arm adapter block having three mounting holes located at the vertices of a triangle, the upper end portion of the frame being rotatably connected to the mounting holes located on the upper side of the rear wheel rocker arm adapter block, the rear wheel rocker arm comprising a rear wheel rocker arm lower fork and a rear wheel rocker arm upper fork, the right end of the rear wheel rocker arm lower fork being rotatably connected to the right end of the rear wheel rocker arm upper fork, the right end of the rear wheel rocker arm upper fork being also rotatably installed on the driving wheel hub, the left end of the rear wheel rocker arm lower fork being rotatably connected to the driving wheel rocker arm shaft, the left end of the rear wheel rocker arm upper fork being rotatably connected to the mounting hole located at the lower right side of the rear wheel rocker arm adapter block, and the mounting hole located on the left side of the rear wheel rocker arm adapter block being used for installing a shock absorber assembly.

[0005] The utility model discloses a multi-link transmission system, wherein a four-link motion mechanism is formed among a rear wheel rocker arm lower fork, a rear wheel rocker arm upper fork, a rear wheel rocker arm adapter block and a frame, thereby greatly improving the motion travel range of the rear wheel rocker arm connection structure (bicycle rear suspension system) compared with a traditional two-wheel belt or chain driven rear wheel rocker arm connection structure, thereby significantly improving the buffering performance and shock absorption effect of the whole vehicle and improving the riding comfort; the utility model has a wide range of applications, and is applicable to off-road bicycles, two-wheel electric vehicles and two-wheel motorcycles; the overall structural design is simple, the production and processing difficulty is low, the component cost is low, and the economy and practicality are strong.

[0006] The preferred technical solution is that the rear wheel rocker arm lower fork and the rear wheel rocker arm upper fork are both Y-shaped structures with an opening facing the right side, the rear wheel rocker arm lower fork includes two lower fork arms extending to the right side, the right end of the lower fork arm is provided with a U-shaped groove 1 with an opening facing the right side, and the left end of the rear wheel rocker arm lower fork is correspondingly provided with two ear plates located on the front and rear sides, and the two ear plates and the left end surface of the rear wheel rocker arm lower fork form a U-shaped groove 2 with an opening facing the left side;

[0007] The rear wheel rocker arm upper fork comprises two upper fork arms extending to the right, the right end of the upper fork arm is provided with a hook block and a connecting plate extending to the lower left side, the hook block and the connecting plate are respectively provided with mounting holes, the connecting plates located at the front and rear sides of the rear wheel rocker arm upper fork are respectively correspondingly embedded in the U-shaped groove 1 located at the front and rear sides of the rear wheel rocker arm lower fork, and are rotatably connected through the pin shaft assembly penetrating the mounting holes on the connecting plate and the mounting holes on the two side walls of the corresponding U-shaped groove 1, the hook blocks located at the front and rear sides of the rear wheel rocker arm upper fork are respectively fixedly installed at the two ends of the driving wheel hub, and the left end of the rear wheel rocker arm upper fork is fixedly provided with a sleeve 1. The rear wheel rocker arm lower fork and the rear wheel rocker arm upper fork have good adaptability, and the rotation connection method between the right ends of the two is simple, forming a rotation fulcrum 1 with good rotation flexibility, convenient installation and disassembly, and the adaptation stability of the U-shaped groove 1 and the connecting plate is good, ensuring that the multi-link transmission system of the utility model has good motion stability.

[0008] A further preferred technical solution is that the rear wheel rocker arm adapter blocks are two correspondingly arranged in parallel, the rear wheel rocker arm adapter blocks are a triangular plate structure, and the three vertices of the rear wheel rocker arm adapter blocks are respectively provided with mounting hole one, mounting hole two and mounting hole three, and bearings are respectively embedded at both ends of a sleeve one located at the left end of the rear wheel rocker arm upper fork, the sleeve one is correspondingly embedded in the mounting hole one position between the two rear wheel rocker arm adapter blocks, and a side of the rear wheel rocker arm adapter block facing the sleeve one is also provided with an annular flange surrounding the outer peripheral side of the mounting hole one, the sleeve one is rotatably connected to the two rear wheel rocker arm adapter blocks by a bolt assembly passing through the interior of the bearing one and the interiors of the two mounting holes one, and the end edge surface of the annular flange away from the rear wheel rocker arm adapter block abuts against the inner ring of the corresponding bearing one. The left end of the rear wheel rocker arm upper fork is rotatably connected and embedded between the two rear wheel rocker arm adapter blocks through a sleeve 1 to form a rotation fulcrum 2. The rotation connection method is simple and the rotation flexibility is good, ensuring that the multi-link transmission system of the utility model has good buffering performance and shock absorption effect.

[0009] The wheelbase is shortened and the strap is retracted to allow the rider to move forwards and backwards, the strap being configured to extend out of the wheelbase by a plurality of forceps extending along the strap to the forward and backward positions. Three front-to-rear symmetrical rotation fulcrums are formed between the upper ends of the two inclined sections of the frame and the two rear wheel rocker arm adapter blocks, ensuring that the frame has good swing flexibility and helping to improve the buffering performance and shock absorption effect of the entire vehicle body.

[0010] A further preferred technical solution is that the sleeve three is internally connected with a bushing three and a bearing four embedded at both ends of the bushing three, and the two ends of the bushing three are respectively abutted against the inner ring of the bearing four, the sleeve three is embedded in the U-shaped groove two at the left end of the rear wheel rocker arm lower fork, the two ear plates are respectively abutted against the two end portions of the sleeve three, the ear plate is also provided with a countersunk slot hole, the outer side of the driving wheel rocker arm shaft is also sleeved with a bushing two, the two ends of the bushing two are respectively embedded with bearings three, the inner ring of the bearing three is tightly against the shoulders at the two ends of the driving wheel rocker arm shaft, the bushing two is connected to the inside of the bushing three, the inner side surface of the bushing three is transitionally matched with the outer side surface of the bushing two, the outer side of one end of the bushing two is provided with an annular eaves body embedded in the countersunk slot hole on the corresponding ear plate, a locking nut is screwed on the threaded section on the outer side of the other end of the bushing two, and the two ear plates and the sleeve three are fixedly locked together by the bushing two, the annular eaves body and the locking nut. Sleeve three in the middle of the frame is embedded and rotatably installed in U-shaped groove two at the left end of the rear wheel rocker arm lower fork, and forms a fulcrum four with good rotation flexibility, which cooperates with the above-mentioned three fulcrums to ensure that the multi-link transmission system of the utility model has a four-link mechanism with good movement stability, thereby having good buffering performance and shock absorption effect.

[0011] A further preferred technical solution is that a weight-reducing hole is provided in the middle of the rear wheel rocker arm adapter block, which helps to improve the portability of the rear wheel rocker arm adapter block and the rotation flexibility of the fulcrum on the rear wheel rocker arm adapter block.

[0012] A further preferred technical solution is that threaded sections are respectively provided at both ends of the driving wheel rocker shaft, and the driving wheel rocker shaft is fixedly locked to the primary output wheel by a locking nut screwed on the threaded section at one end, and the driving wheel rocker shaft is fixedly locked to the secondary input wheel by a locking nut screwed on the threaded section at the other end.

[0013] A further preferred technical solution is that a rear wheel assembly located between the two lower fork arms and between the two upper fork arms on the rear wheel rocker arm is installed on the driving hub.

[0014] A further preferred technical solution also includes a motor, a primary input wheel is fixedly provided on the output shaft located at the front side of the motor, a primary output wheel is fixedly provided at the front end of the driving wheel rocker arm shaft, the primary input wheel and the primary output wheel are connected by transmission member 1, a secondary input wheel is fixedly provided at the rear end of the driving wheel rocker arm shaft, a secondary output wheel is fixedly provided at the rear end of the driving wheel hub, and the secondary input wheel and the secondary output wheel are connected by transmission member 2. Ensure that the rear wheel rocker arm connection structure of the utility model is also applicable to two-wheel electric vehicles or two-wheel electric bicycles. The motor, the primary input wheel, the primary output wheel, the secondary input wheel and the secondary output wheel form a two-stage coaxial transmission system, and have good synergistic adaptability with the rear wheel rocker arm connection structure (four-bar linkage) formed by the rear wheel rocker arm lower fork, the rear wheel rocker arm upper fork, the rear wheel rocker arm adapter block, and the frame, which greatly shortens the wheelbase between the two-stage coaxial transmission system and effectively improves the maneuverability of the whole vehicle.

[0015] A further preferred technical solution is that the transmission member 1 and the transmission member 2 are belts or chains.

[0016] The advantages and beneficial effects of the utility model are:

[0017] 1. The utility model discloses a multi-link transmission system, wherein a four-link motion mechanism is formed among a rear wheel rocker arm lower fork, a rear wheel rocker arm upper fork, a rear wheel rocker arm adapter block and a frame, thereby greatly improving the motion travel range of the rear wheel rocker arm connection structure (bicycle rear suspension system) compared with a traditional two-wheel belt or chain drive type rear wheel rocker arm connection structure, thereby significantly improving the buffering performance and shock absorption effect of the whole vehicle, and improving riding comfort; the utility model has a wide range of applications, and is applicable to off-road bicycles, two-wheel electric vehicles and two-wheel motorcycles; the overall structural design is simple, the production and processing difficulty is low, the component cost is low, and the economy and practicality are strong.

[0018] 2. The rear wheel rocker arm lower fork and the rear wheel rocker arm upper fork have good adaptability, and the rotation connection method between the right ends of the two is simple, forming a rotation fulcrum with good rotation flexibility, which is convenient for installation and disassembly, and the U-shaped groove and the connecting plate have good adaptability stability, ensuring that the multi-link transmission system of the utility model has good movement stability.

[0019] 3. The left end of the rear wheel rocker arm upper fork is rotatably connected and embedded between the two rear wheel rocker arm adapter blocks through a sleeve 1 to form a rotation fulcrum 2. The rotation connection method is simple and the rotation flexibility is good, ensuring that the multi-link transmission system of the utility model has good buffering performance and shock absorption effect.

[0020] 4. Three front-to-rear symmetrical rotation fulcrums are formed between the upper ends of the two inclined sections of the frame and the two rear wheel rocker arm adapter blocks, ensuring that the frame has good swing flexibility and helps to improve the buffering performance and shock absorption effect of the entire vehicle body.

[0021] 5. The sleeve three in the middle of the frame is embedded and rotatably installed in the U-shaped groove two at the left end of the rear wheel rocker arm lower fork, and forms a fulcrum four with good rotation flexibility, which cooperates with the above-mentioned three fulcrums to ensure that the multi-link transmission system of the utility model has a four-link mechanism with good movement stability, thereby having good buffering performance and shock absorption effect.

[0022] 6. The motor, the first-stage input wheel, the first-stage output wheel, the second-stage input wheel and the second-stage output wheel form a two-stage coaxial transmission system, and have good coordination and adaptability with the rear wheel rocker arm connection structure (four-bar linkage mechanism) formed by the rear wheel rocker arm lower fork, the rear wheel rocker arm upper fork, the rear wheel rocker arm adapter block and the frame, which greatly shortens the wheelbase between the two-stage coaxial transmission system and effectively improves the maneuverability of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 Schematic diagram of a conventional two-wheel transmission member two-drive rear wheel rocker arm connection structure in the background art;

[0024] Figure 2 It is a three-dimensional structural diagram of the multi-link transmission system of the utility model (the frame is hidden);

[0025] Figure 3 yes Figure 2 Partial cross-sectional view along the AA direction;

[0026] Figure 4 It is a three-dimensional structural diagram of a pair of rear wheel rocker arm adapter blocks;

[0027] Figure 5 It is a three-dimensional structural diagram of the rear wheel rocker arm;

[0028] Figure 6 It is a three-dimensional structural diagram of the multi-link transmission system of the utility model;

[0029] Figure 7 yes Figure 6 Partial cross-sectional view along the BB direction;

[0030] Figure 8 yes Figure 6 Partial cross-sectional view in the CC direction;

[0031] Fig. 9 It is a three-dimensional structural diagram of the frame;

[0032] Fig.10 It is a horizontal cross-sectional view of the multi-link transmission system of the utility model at the position of the driving wheel rocker arm shaft;

[0033] Fig.11 It is a usage state diagram of the multi-link transmission system of the utility model.

[0034] In the figure: 1, motor; 2, primary input wheel; 3, transmission component 1; 4, primary output wheel; 5, driving wheel rocker arm shaft; 6, rear wheel rocker arm lower fork; 7, rear wheel rocker arm upper fork; 8, secondary input wheel; 9, transmission component 2; 10, secondary output wheel; 11, driving wheel hub; 12, pin assembly; 13, frame; 14, rear wheel assembly; 15, rear wheel rocker arm adapter block; 16, locking screw; 17, bushing 1; 18, bolt assembly; 19, shock absorber assembly; 5-1, bushing 2; 5-2, annular eaves; 6-1, lower fork arm; 6-2, U-shaped groove 1; 6- 3. Ear plate; 6-4. U-shaped groove 2; 7-1. Upper fork arm; 7-2. Sleeve 1; 7-3. Hook block; 7-4. Connecting plate; 13-1. Y-shaped support arm; 13-1a. Inclined section; 13-1b. Vertical section; 13-2. Sleeve 2; 13-3. Sleeve 3; 13-4. Bushing 3; 15-1. Mounting hole 1; 15-1a. Annular flange; 15-2. Mounting hole 2; 15-3. Mounting hole 3; 15-4. Lightening hole; M. Bearing 1; N. Bearing 2; O. Bearing 3; P. Bearing 4; Q. Threaded section; R. Locking nut. DETAILED DESCRIPTION

[0035] The following is a further description of the specific implementation of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0036] Example

[0037] like Figures 2 to 11As shown, the utility model is a multi-link transmission system, including a driving wheel rocker arm shaft 5, a rear wheel rocker arm, a frame 13, a driving wheel hub 11 and a rear wheel rocker arm adapter block 15, wherein the frame 13 has a sleeve three 13-3 in the middle, the driving wheel rocker arm shaft 5 passes through and is rotatably installed inside the sleeve three 13-3, the rear wheel rocker arm adapter block 15 has three mounting holes located at the vertices of a triangle, the upper end of the frame 13 is rotatably connected to the mounting hole located on the upper side of the rear wheel rocker arm adapter block 15, and the The rear wheel rocker arm includes a rear wheel rocker arm lower fork 6 and a rear wheel rocker arm upper fork 7. The right end of the rear wheel rocker arm lower fork 6 is rotatably connected to the right end of the rear wheel rocker arm upper fork 7. The right end of the rear wheel rocker arm upper fork 7 is also rotatably installed on the driving wheel hub 11. The left end of the rear wheel rocker arm lower fork 6 is rotatably connected to the driving wheel rocker arm shaft 5. The left end of the rear wheel rocker arm upper fork 7 is rotatably connected to the mounting hole located at the lower right side of the rear wheel rocker arm adapter block 15. The mounting hole located on the left side of the rear wheel rocker arm adapter block 15 is used to install the shock absorber assembly 19.

[0038] Preferably, the rear wheel rocker arm lower fork 6 and the rear wheel rocker arm upper fork 7 are both Y-shaped structures with an opening toward the right side, the rear wheel rocker arm lower fork 6 includes two lower fork arms 6-1 extending toward the right side, the right end of the lower fork arm 6-1 is provided with a U-shaped groove 1 6-2 with an opening toward the right side, and the left end of the rear wheel rocker arm lower fork 6 is correspondingly provided with two ear plates 6-3 located at the front and rear sides, and the two ear plates 6-3 and the left end surface of the rear wheel rocker arm lower fork 6 form a U-shaped groove 2 6-4 with an opening toward the left side;

[0039] The rear wheel rocker arm upper fork 7 comprises two upper fork arms 7-1 extending to the right side, the right end portion of the upper fork arm 7-1 is provided with a hook block 7-3 and a connecting plate 7-4 extending to the lower left side, the hook block 7-3 and the connecting plate 7-4 are respectively provided with mounting holes, the connecting plates 7-4 located on the front and rear sides of the rear wheel rocker arm upper fork 7 are respectively correspondingly embedded in the U-shaped groove 6-2 located on the front and rear sides of the rear wheel rocker arm lower fork 6, and are rotatably connected by a pin shaft assembly 12 that penetrates the mounting holes on the connecting plate 7-4 and the mounting holes on the two side walls of the corresponding U-shaped groove 6-2, the hook blocks 7-3 located on the front and rear sides of the rear wheel rocker arm upper fork 7 are respectively fixedly installed on the two end portions of the driving wheel hub 11, and a sleeve 7-2 is fixedly provided on the left end of the rear wheel rocker arm upper fork 7.

[0040] Further preferably, the rear wheel rocker arm adapter block 15 is two corresponding parallel sets, the rear wheel rocker arm adapter block 15 is a triangular plate structure, the three vertices of the rear wheel rocker arm adapter block 15 are respectively provided with a mounting hole 15-1, a mounting hole 2 15-2 and a mounting hole 3 15-3, and the two ends of the sleeve 1 7-2 located at the left end of the rear wheel rocker arm upper fork 7 are respectively embedded with bearings 154, and the sleeve 1 7-2 is correspondingly embedded between the two rear wheel rocker arm adapter blocks 15. The mounting hole 15-1 is located at the position, and the side of the rear wheel rocker arm adapter block 15 facing the sleeve 7-2 is also provided with an annular flange 15-1a surrounding the outer peripheral side of the mounting hole 15-1. The sleeve 7-2 is rotatably connected with the two rear wheel rocker arm adapter blocks 15 through a bolt assembly 18 that penetrates the interior of the bearing M and the two mounting holes 15-1. The end edge surface of the annular flange 15-1a away from the rear wheel rocker arm adapter block 15 abuts against the inner ring of the corresponding bearing M.

[0041] Further preferably, the frame 13 includes a Y-shaped support arm 13-1 with an opening upward, the Y-shaped support arm 13-1 includes two inclined sections 13-1a extending symmetrically to the front and rear sides upward and a vertical section 13-1b located at the lower side, the lower ends of the two inclined sections 13-1a are fixedly arranged on the upper side of the sleeve three 13-3, the upper end of the vertical section 13-1b is fixedly arranged on the lower side of the sleeve three 13-3, the upper ends of the two inclined sections 13-1a are respectively provided with sleeves 13-2 with openings facing away from each other, the bottom of the sleeve 13-2 is provided with a threaded through hole, and the two rear wheel rockers The arm adapter block 15 is correspondingly embedded between the sleeves 13-2 at the upper ends of the two inclined sections 13-1a, and a bearing 2N is embedded inside the mounting hole 15-2 of the rear wheel rocker arm adapter block 15. The two rear wheel rocker arm adapter blocks 15 are respectively threadedly fixedly connected to the threaded through hole at the bottom of the sleeve 13-2 on the corresponding side inclined section 13-1a through a locking screw 16 that passes through the inner ring of the bearing 2N, and also include a bushing 17 sleeved on the locking screw 16, one end of the bushing 17 abuts against the outer side surface of the bottom of the sleeve 13-2, and the other end abuts against the inner ring of the bearing 2N.

[0042] Further preferably, the sleeve three 13-3 is internally connected with a bushing three 13-4 and bearings four P embedded at both ends of the bushing three 13-4, and the two ends of the bushing three 13-4 are respectively abutted against the inner ring of the bearing four P, the sleeve three 13-3 is embedded in the U-shaped groove two 6-4 at the left end of the rear wheel rocker arm lower fork 6, the two ear plates 6-3 are respectively corresponding to the two ends of the sleeve three 13-3, and the ear plates 6-3 are also provided with countersunk slots, the outer side of the driving wheel rocker arm shaft 5 is also sleeved with a bushing two 5-1, and the two ends of the bushing two 5-1 are respectively embedded with bearings 3-0, the inner ring of the bearing 3-0 is pressed against the shoulders at both ends of the driving wheel rocker shaft 5, the bushing 2 5-1 is connected to the inside of the bushing 3 13-4, the inner side of the bushing 3 13-4 is transitionally matched with the outer side of the bushing 2 5-1, the outer side of one end of the bushing 2 5-1 is provided with an annular eaves body 5-2 embedded in the countersunk slot hole on the corresponding ear plate 6-3, and a locking nut R is screwed on the threaded section Q on the outer side of the other end of the bushing 2 5-1, and the two ear plates 6-3 and the sleeve 3 13-3 are fixedly locked together by the bushing 2 5-1, the annular eaves body 5-2 and the locking nut R.

[0043] Further preferably, a weight-reducing hole 15 - 4 is provided in the middle of the rear wheel rocker arm adapter block 15 .

[0044] Further preferably, both ends of the driving wheel rocker arm shaft 5 are respectively provided with threaded sections Q, the driving wheel rocker arm shaft 5 is fixedly locked to the primary output wheel 4 by a locking nut R screwed on the threaded section Q at one end, and the driving wheel rocker arm shaft 5 is fixedly locked to the secondary input wheel 8 by a locking nut R screwed on the threaded section Q at the other end.

[0045] Further preferably, the driving hub 11 is mounted with a rear wheel assembly 14 located between the two lower fork arms 6 - 1 and between the two upper fork arms 7 - 1 on the rear wheel rocker arm.

[0046] Further preferably, it also includes a motor 1, a primary input wheel 2 is fixedly provided on the output shaft located on the front side of the motor 1, a primary output wheel 4 is fixedly provided at the front end of the driving wheel rocker arm shaft 5, the primary input wheel 2 and the primary output wheel 4 are connected by transmission member 1 3, a secondary input wheel 8 is fixedly provided at the rear end of the driving wheel rocker arm shaft 5, a secondary output wheel 10 is fixedly provided at the rear end of the driving wheel hub 11, and the secondary input wheel 8 and the secondary output wheel 10 are connected by transmission member 2 9.

[0047] Further preferably, the transmission member 1 3 and the transmission member 2 9 are belts or chains.

[0048] The utility model discloses a multi-link transmission system, wherein a four-link motion mechanism is formed among a rear wheel rocker arm lower fork, a rear wheel rocker arm upper fork, a rear wheel rocker arm adapter block and a frame, thereby greatly improving the motion travel range of the rear wheel rocker arm connection structure (bicycle rear suspension system) compared with a traditional two-wheel belt or chain driven rear wheel rocker arm connection structure, thereby significantly improving the buffering performance and shock absorption effect of the whole vehicle and improving the riding comfort; the utility model has a wide range of applications, and is applicable to off-road bicycles, two-wheel electric vehicles and two-wheel motorcycles; the overall structural design is simple, the production and processing difficulty is low, the component cost is low, and the economy and practicality are strong.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A multi-link transmission system, characterized in that: The invention comprises a driving wheel rocker arm shaft (5), a rear wheel rocker arm, a vehicle frame (13), a driving wheel hub (11) and a rear wheel rocker arm adapter block (15); the vehicle frame (13) has a sleeve three (13-3) in the middle; the driving wheel rocker arm shaft (5) passes through and is rotatably mounted inside the sleeve three (13-3); the rear wheel rocker arm adapter block (15) has three mounting holes located at the vertices of a triangle; the upper end of the vehicle frame (13) is rotatably connected to the mounting hole located on the upper side of the rear wheel rocker arm adapter block (15); the rear wheel rocker arm comprises a rear wheel rocker arm The lower fork (6) and the rear wheel rocker arm upper fork (7), the right end of the rear wheel rocker arm lower fork (6) is rotatably connected to the right end of the rear wheel rocker arm upper fork (7), the right end of the rear wheel rocker arm upper fork (7) is also rotatably mounted on the driving wheel hub (11), the left end of the rear wheel rocker arm lower fork (6) is rotatably connected to the driving wheel rocker arm shaft (5), the left end of the rear wheel rocker arm upper fork (7) is rotatably connected to the mounting hole located at the lower right side of the rear wheel rocker arm adapter block (15), and the mounting hole located at the left side of the rear wheel rocker arm adapter block (15) is used to install a shock absorbing assembly (19).

2. The multi-link transmission system according to claim 1, characterized in that: The rear wheel rocker arm lower fork (6) and the rear wheel rocker arm upper fork (7) are both Y-shaped structures with an opening toward the right side. The rear wheel rocker arm lower fork (6) comprises two lower fork arms (6-1) extending toward the right side. The right end of the lower fork arm (6-1) is provided with a U-shaped groove 1 (6-2) with an opening toward the right side. The left end of the rear wheel rocker arm lower fork (6) is correspondingly provided with two ear plates (6-3) located at the front and rear sides. The two ear plates (6-3) and the left end surface of the rear wheel rocker arm lower fork (6) form a U-shaped groove 2 (6-4) with an opening toward the left side. The rear wheel rocker arm upper fork (7) comprises two upper fork arms (7-1) extending to the right side, the right end of the upper fork arm (7-1) is provided with a hook block (7-3) and a connecting plate (7-4) extending to the left lower side, the hook block (7-3) and the connecting plate (7-4) are respectively provided with mounting holes, the connecting plates (7-4) located at the front and rear sides of the rear wheel rocker arm upper fork (7) are respectively correspondingly embedded in the U-shaped groove (6-2) located at the front and rear sides of the rear wheel rocker arm lower fork (6), and are rotatably connected through a pin assembly (12) penetrating the mounting holes on the connecting plate (7-4) and the mounting holes on the side walls of the corresponding U-shaped groove (6-2), the hook blocks (7-3) located at the front and rear sides of the rear wheel rocker arm upper fork (7) are respectively fixedly installed on the two ends of the driving wheel hub (11), and the left end of the rear wheel rocker arm upper fork (7) is fixedly provided with a sleeve (7-2).

3. The multi-link transmission system according to claim 2, characterized in that: The rear wheel rocker arm adapter block (15) is a triangular plate structure, and the three vertices of the rear wheel rocker arm adapter block (15) are respectively provided with a mounting hole 1 (15-1), a mounting hole 2 (15-2) and a mounting hole 3 (15-3). The two ends of the sleeve 1 (7-2) located at the left end of the rear wheel rocker arm upper fork (7) are respectively embedded with a bearing 1 (M). The sleeve 1 (7-2) is correspondingly embedded in the mounting hole 1 (15-2) between the two rear wheel rocker arm adapter blocks (15). 5-1) position, and a side surface of the rear wheel rocker arm adapter block (15) facing the sleeve one (7-2) is also provided with an annular flange (15-1a) surrounding the outer peripheral side of the mounting hole one (15-1), the sleeve one (7-2) is rotatably connected with the two rear wheel rocker arm adapter blocks (15) through a bolt assembly (18) penetrating the interior of the bearing one (M) and the interior of the two mounting holes one (15-1), and an end edge surface of the annular flange (15-1a) away from the rear wheel rocker arm adapter block (15) abuts against the inner ring of the corresponding bearing one (M).

4. The multi-link transmission system according to claim 3, characterized in that: The frame (13) comprises a Y-shaped support arm (13-1) with an opening facing upward, the Y-shaped support arm (13-1) comprises two inclined sections (13-1a) extending symmetrically to the front and rear sides upward and a vertical section (13-1b) located at the lower side, the lower ends of the two inclined sections (13-1a) are fixedly arranged on the upper side of the sleeve three (13-3), the upper ends of the vertical section (13-1b) are fixedly arranged on the lower side of the sleeve three (13-3), the upper ends of the two inclined sections (13-1a) are respectively provided with sleeves two (13-2) with openings facing in opposite directions, the bottom of the sleeve two (13-2) is provided with a threaded through hole, the two rear wheel rocker arm adapter blocks (15 ) is correspondingly embedded between sleeves 2 (13-2) at the upper ends of the two inclined sections (13-1a), and a bearing 2 (N) is embedded inside the mounting hole 2 (15-2) of the rear wheel rocker arm adapter block (15). The two rear wheel rocker arm adapter blocks (15) are respectively threadedly fixedly connected to the threaded through hole at the bottom of the sleeve 2 (13-2) on the corresponding side inclined section (13-1a) through a locking screw (16) inserted into the inner ring of the bearing 2 (N), and also include a bushing 1 (17) sleeved on the locking screw (16), one end of the bushing 1 (17) abuts against the outer side surface of the bottom of the sleeve 2 (13-2), and the other end abuts against the inner ring of the bearing 2 (N).

5. The multi-link transmission system according to claim 4, characterized in that: The sleeve three (13-3) is internally connected with a bushing three (13-4) and bearing four (P) embedded at both ends of the bushing three (13-4), and the two ends of the bushing three (13-4) are respectively abutted against the inner ring of the bearing four (P). The sleeve three (13-3) is embedded in the U-shaped groove two (6-4) at the left end of the rear wheel rocker arm lower fork (6). The two ear plates (6-3) are respectively corresponding to the two ends of the sleeve three (13-3). The ear plates (6-3) are also provided with countersunk slot holes. The outer side of the driving wheel rocker arm shaft (5) is also sleeved with a bushing two (5-1), and the two ends of the bushing two (5-1) are respectively embedded with bearing three (O). The inner ring of the bearing three (O) is pressed against the shoulders at both ends of the driving wheel rocker arm shaft (5), the bushing two (5-1) is connected to the inside of the bushing three (13-4), the inner side surface of the bushing three (13-4) is transitionally matched with the outer side surface of the bushing two (5-1), the outer side of one end of the bushing two (5-1) is provided with an annular eaves body (5-2) embedded in the countersunk slot hole on the corresponding ear plate (6-3), and a locking nut (R) is screwed on the threaded section (Q) on the outer side of the other end of the bushing two (5-1), and the two ear plates (6-3) and the sleeve three (13-3) are fixedly locked together through the bushing two (5-1), the annular eaves body (5-2) and the locking nut (R).

6. The multi-link transmission system according to claim 5, characterized in that: A weight-reducing hole (15-4) is provided in the middle of the rear wheel rocker arm adapter block (15).

7. The multi-link transmission system according to claim 6, characterized in that: The driving wheel rocker arm shaft (5) is provided with threaded sections (Q) at both ends respectively. The driving wheel rocker arm shaft (5) is fixedly locked to the primary output wheel (4) by a locking nut (R) screwed on the threaded section (Q) at one end, and the driving wheel rocker arm shaft (5) is fixedly locked to the secondary input wheel (8) by a locking nut (R) screwed on the threaded section (Q) at the other end.

8. The multi-link transmission system according to claim 7, characterized in that: The driving wheel hub (11) is provided with a rear wheel assembly (14) located between the two lower fork arms (6-1) and between the two upper fork arms (7-1) on the rear wheel rocker arm.

9. The multi-link transmission system according to any one of claims 1 to 8, characterized in that: The invention also comprises a motor (1), a primary input wheel (2) is fixedly arranged on the output shaft located at the front side of the motor (1), a primary output wheel (4) is fixedly arranged at the front end of the driving wheel rocker arm shaft (5), the primary input wheel (2) and the primary output wheel (4) are connected by transmission through a first transmission member (3), a secondary input wheel (8) is fixedly arranged at the rear end of the driving wheel rocker arm shaft (5), a secondary output wheel (10) is fixedly arranged at the rear end of the driving wheel hub (11), and the secondary input wheel (8) and the secondary output wheel (10) are connected by transmission through a second transmission member (9).

10. The multi-link transmission system according to claim 9, characterized in that: The transmission member 1 (3) and the transmission member 2 (9) are belts or chains.

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