Gear transmission bicycle

Abstract

The utility model relates to the technical field of bicycles, and particularly discloses a gear transmission bicycle which comprises a rear wheel, a frame, a front wheel, two transmission shaft boxes and a gearbox, a seat, a front fork and a bracket are installed on the frame, the front fork is connected with the front wheel through a front hub, the bracket is installed in the middle of the bottom end of the frame, the gearbox is installed on the bracket, and the gearbox is connected with the front hub. According to the bicycle, gear transmission is adopted, transmission is safe and reliable, transmission efficiency is high, power is provided by pedals, and the bicycle is environmentally friendly. According to the bicycle, the synchronizer structure is adopted, the synchronizer and the transmission systems on the two sides provide the speed change function for the gear transmission bicycle, after the transmission device on one side of the bicycle is damaged, the transmission system on the other side of the bicycle can still be used, the other side of the bicycle can still be used for continuous riding when a sudden failure occurs in the riding process, and the riding safety is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of bicycles, in particular to a gear transmission bicycle. Background Art

[0002] Bicycles, also known as bicycles or bikes, are usually small two-wheeled land vehicles. People ride on the bicycles and use pedals as power. It is a green and environmentally friendly means of transportation. Bicycles are widely used, but existing bicycles have many defects:

[0003] 1: According to the authorized patent number: CN202022772885.0, a chainless shaft-driven bicycle, this technology mainly uses bevel gear transmission technology to solve the transmission problem of the bicycle, achieving the effect of fast and comfortable riding, less maintenance, and green travel. However, this technology has the following defects: the bicycle transmission ratio is fixed and does not have a speed change function.

[0004] 2: According to the authorized patent number: CN202123231927.0, a gear-driven bicycle, this technology mainly adopts multi-stage gear transmission technology to solve the transmission problem of the bicycle, which is more stable than the chain transmission method of the traditional bicycle and will not cause the chain to fall off. However, this technology has the following defects: the gears of the transmission part of the bicycle are exposed to the air, without effective protection, easy to damage, and not conducive to long-term use.

[0005] 3: According to the authorized patent number: CN202220154810.2, a rear-drive chainless bicycle mainly adopts multi-stage gear transmission to directly solve the problem of chain falling off and getting stuck, and achieves the effect of reducing the energy loss caused by the friction of chain transmission. However, this technology has the following defects: the bicycle structure is not conducive to maintenance. Although the problem of chain falling off is solved, once the gear is fatigued or stuck by dirt, the bicycle will not be able to operate, and the transmission ratio is single and does not have the speed change function.

[0006] Therefore, it can be seen from the above that the existing technology first lacks a widely accepted reliable speed change solution, and most products do not have a speed change function. Secondly, there is a lack of consideration for the maintenance of the gear transmission system. Some products use open gear transmission, which has a poor working environment and is easily damaged. In addition, once the transmission is damaged, the repair of the gear system is relatively complicated and difficult compared to chain-driven bicycles. Considering that gear bicycles are relatively niche and there is no possibility of opening offline stores, the product will not be available during this period, and it is difficult to update and repair the equipment. For this reason, a gear-driven bicycle is provided. Utility Model Content

[0007] The purpose of the utility model is to provide a gear transmission bicycle to solve the problems raised by the above-mentioned background technology in view of the defects of the prior art.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a gear-driven bicycle, comprising a rear wheel, a frame, a front wheel, two transmission shaft boxes and a gearbox, the frame is equipped with a seat, a front fork and a bracket, the front fork and the front wheel are connected by a front hub, a bracket is installed at the middle of the bottom end of the frame, a gearbox is installed on the bracket, transmission shaft boxes are installed on both sides of the gearbox, one end of the transmission shaft box is connected to the rear wheel through the rear hub, a main shaft is provided in the middle of the gearbox, a first bevel gear is installed at one end of the main shaft, and a second bevel gear is installed at the other end of the main shaft, a right transmission shaft is provided inside the transmission shaft box on one side of the frame, a left transmission shaft is provided inside the transmission shaft box on the other side of the frame, one end of the right transmission shaft and the left transmission shaft are both equipped with a fourth bevel gear, and the other end of the right transmission shaft and the left transmission shaft are both equipped with a third bevel gear, a rear wheel rotating shaft is provided inside the rear hub, and bevel gear shafts are fixed at both ends of the rear wheel rotating shaft.

[0009] As a preferred technical solution of the utility model, the No. 3 bevel gears at the other ends of the right transmission shaft and the left transmission shaft are meshed and connected with the bevel teeth at both ends of the bevel gear shaft.

[0010] As an optimal technical solution of the utility model, the fourth bevel gear at one end of the left transmission shaft is meshed and connected with the second bevel gear on the main shaft, and the fourth bevel gear at one end of the right transmission shaft is meshed and connected with the first bevel gear on the main shaft.

[0011] As an optimal technical solution of the utility model, the main shaft is installed in the transmission shaft box through the left transmission shaft sleeve, the right transmission shaft sleeve and the sleeve, the left transmission shaft and the right transmission shaft are both installed inside the transmission shaft box through cylindrical roller bearings, and the rear hub is installed on the frame.

[0012] As a preferred technical solution of the utility model, a spline is provided in the middle section of the main shaft, which is connected to the synchronizer through the spline. A synchronizer sleeve is provided at each end of the main shaft. The synchronizer sleeve is connected to the left transmission sleeve and the right transmission sleeve through a flat key. The synchronizer sleeve is fixed on a deep groove ball bearing, one end of the synchronizer sleeve is engaged with the synchronizer, and the other end is connected to the transmission shaft box. A paddle is installed on the synchronizer, and the paddle is connected to the shift shaft. A return spring is provided on the shift shaft.

[0013] As a preferred technical solution of the utility model, both ends of the main shaft are fixedly connected through cranks and pedals, a support foot is installed on the transmission shaft box on one side of the frame, both ends of the gearbox are installed with gearbox end covers, front end upper end covers are installed on the tops of both sides of the gearbox, and front end lower end covers are installed on the bottoms of both sides of the gearbox.

[0014] As a preferred technical solution of the utility model, a rear end upper box body and a rear end lower box body are installed on the rear wheel, brakes are installed on the front fork and the frame through bolts, brake discs are installed on the front hub and the rear hub, the brakes are connected to the brake handle through a brake line, the brake handle is installed on the bicycle handle, the bicycle handle is installed on the front fork, and a speed switch is also installed on the bicycle handle, and the speed switch is connected to the gearbox through a speed change line.

[0015] As a preferred technical solution of the utility model, the rear hub is connected to the rear wheel through spokes, and the front hub is connected to the front wheel through spokes.

[0016] Compared with the prior art, the beneficial effects of the utility model are:

[0017] 1: The bicycle adopts gear transmission, which is safe and reliable, with high transmission efficiency. The power is provided by pedals, which is green and environmentally friendly.

[0018] 2: The bicycle is equipped with a box outside the gear transmission, which provides a good working environment for the gear transmission.

[0019] 3: The bicycle adopts a synchronizer structure, and the synchronizer and the transmission systems on both sides provide the gear transmission bicycle with a speed changing function.

[0020] 4: After the transmission device on one side of the bicycle is damaged, the transmission system on the other side can still be used. When encountering a sudden failure during riding, you can still use the other side to continue riding, ensuring the safety of riding.

[0021] 5: If the transmission device on one side of the bicycle is damaged, the transmission case on that side can be removed and mailed for repair. During this period, the bicycle can continue to be used with a single transmission ratio, and the repair will not cause inconvenience to the customer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the internal structure of the gearbox of the utility model;

[0024] Figure 3 This is a schematic diagram of the connection structure of the transmission shaft box of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the bracket of the utility model.

[0026] In the figure: 1, rear wheel; 2, spokes; 3, seat; 4, frame; 5, speed switch; 6, bicycle handlebars; 7, brake handle; 8, speed cable; 9, brake cable; 10, front fork; 11, front wheel; 12, brake disc; 13, rear upper housing; 14, rear lower housing; 15, brake; 16, kickstand; 17, drive shaft box; 18, bracket; 19, pedal; 20, crank; 21, front upper end cover; 22, front lower end cover; 23, front hub; 24, spindle; 25. Synchronous sleeve; 26. Deep groove ball bearing; 27. Transmission cover; 28. Synchronizer; 29. ​​Return spring; 30. Transmission; 31. Paddle; 32. Shift shaft; 33. Bevel gear shaft; 34. Bevel gear No. 3; 35. Cylindrical roller bearing; 36. Left transmission shaft; 37. Bevel gear No. 4; 38. Left transmission sleeve; 39. Bevel gear No. 2; 40. Bevel gear No. 1; 41. Right transmission sleeve; 42. Sleeve; 43. Right transmission shaft; 44. Rear hub. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0028] Example: See Figure 1-4 The utility model provides a technical solution: a gear-driven bicycle, comprising a rear wheel 1, a frame 4, a front wheel 11, two transmission shaft boxes 17 and a gearbox 30, a seat 3, a front fork 10, and a bracket 18 are mounted on the frame 4, the front fork 10 and the front wheel 11 are connected by a front hub 23, a bracket 18 is mounted at the middle of the bottom end of the frame 4, a gearbox 30 is mounted on the bracket 18 by screws, transmission shaft boxes 17 are mounted on both sides of the gearbox 30, one end of the transmission shaft box 17 is connected to the rear wheel 1 through a rear hub 44, and a main gearbox 30 is arranged in the middle of the gearbox 30. Axle 24, a first bevel gear 40 is installed at one end of the main shaft 24, a second bevel gear 39 is installed at the other end of the main shaft 24, a right-side transmission shaft 43 is arranged inside the transmission shaft box 17 on one side of the frame 4, a left-side transmission shaft 36 is arranged inside the transmission shaft box 17 on the other side of the frame 4, a fourth bevel gear 37 is installed at one end of the right transmission shaft 43 and the left transmission shaft 36, a third bevel gear 34 is installed at the other end of the right transmission shaft 43 and the left transmission shaft 36, a rear wheel shaft is arranged inside the rear hub 44, and bevel gear shafts 33 are fixed at both ends of the rear wheel shaft.

[0029] The third bevel gear 34 at the other end of the right transmission shaft 43 and the left transmission shaft 36 is meshed and connected with the bevel teeth at both ends of the bevel gear shaft 33 .

[0030] The fourth bevel gear 37 at one end of the left transmission shaft 36 is meshed and connected with the second bevel gear 39 on the main shaft 24 , and the fourth bevel gear 37 at one end of the right transmission shaft 43 is meshed and connected with the first bevel gear 40 on the main shaft 24 .

[0031] The main shaft 24 is installed in the transmission shaft box 17 through the left transmission shaft sleeve 38, the right transmission shaft sleeve 41 and the sleeve 42. The left transmission shaft 36 and the right transmission shaft 43 are both installed inside the transmission shaft box 17 through cylindrical roller bearings 35. The rear hub 44 is installed on the frame 4.

[0032] A spline is provided in the middle section of the main shaft 24, which is connected to the synchronizer 28 through the spline. A synchronizer sleeve 25 is installed at each end of the main shaft 24. The synchronizer sleeve 25 is connected to the left transmission sleeve 38 and the right transmission sleeve 41 through a flat key. The synchronizer sleeve 25 is fixed on the deep groove ball bearing 26. One end of the synchronizer sleeve 25 is meshed with the synchronizer 28, and the other end is connected to the transmission shaft box 17. A paddle 31 is installed on the synchronizer 28. The paddle 31 is connected to the shift shaft 32. A return spring 29 is sleeved on the shift shaft 32. When the speed switch is turned, the speed change line is pulled, thereby pulling the shift shaft to move, thereby driving the paddle. The paddle drives the synchronizer to move, changing the synchronizer sleeve meshed with it, so that the power is transmitted to different transmission boxes.

[0033] Both ends of the main shaft 24 are fixedly connected through the crank 20 and the pedal 19, a support foot 16 is installed on the transmission shaft box 17 on one side of the frame 4, both ends of the gearbox 30 are installed with gearbox end covers 27, the tops of both sides of the gearbox 30 are installed with front end upper end covers 21, and the bottoms of both sides of the gearbox 30 are installed with front end lower end covers 22.

[0034] A rear end upper box body 13 and a rear end lower box body 14 are installed on the rear wheel 1, a brake 15 is installed on the front fork 10 and the frame 4 through bolts, a brake disc 12 is installed on the front hub 23 and the rear hub 44, the brake 15 is connected to the brake handle 7 through a brake line 9, the brake handle 7 is installed on the bicycle handle 6, the bicycle handle 6 is installed on the front fork 10, and a speed switch 5 is also installed on the bicycle handle 6, and the speed switch 5 is connected to the gearbox 30 through a speed line 8.

[0035] The rear hub 44 is connected to the rear wheel 1 through the spokes 2 , and the front hub 23 is connected to the front wheel 11 through the spokes 2 .

[0036] Working principle: A gear-driven bicycle, firstly, adopts gear drive to solve the problems of chain dragging and chain breaking caused by chain drive of traditional bicycles; secondly, by adding a speed change system, the problem of difficult speed change for gear-driven bicycles is solved, so that gear-driven bicycles can achieve two-stage speed change; finally, by separately designing the speed change and transmission parts, the problem of difficult installation and maintenance of the transmission system of gear-driven bicycles, as well as the problem of being unable to use in case of emergencies such as gear damage, is solved.

[0037] When in use, the main shaft 24 is rotated by the pedal 19, thereby driving the second bevel gear 39 and the first bevel gear 40 to rotate, and the first bevel gear 40 and the second bevel gear 39 are used to rotate to drive the left transmission shaft 36 and the right transmission shaft 43 to rotate, and the left transmission shaft 36 and the right transmission shaft 43 are used to rotate around the cylindrical roller bearing 35, thereby driving the third bevel gear 34 to rotate, thereby driving the bevel gear shaft 33 on the rear hub 44 to rotate, thereby driving the rear wheel 1 on the rear hub 44 to rotate, thereby pushing the front wheel 11 to rotate forward, thereby pushing the entire bicycle forward, and when it is necessary to change speed, by adjusting the speed change switch 5, the speed change cable 8 is driven to pull the shift shaft 32 to move, thereby driving the shifter The paddle 31 drives the synchronizer 28 to move, changing the synchronizer sleeve 25 meshing with it, so that the power is transmitted to different transmission shaft boxes 17 to achieve the purpose of speed regulation. Specifically, the pedal drives the main shaft to rotate, and the main shaft drives the synchronizer to rotate through the spline. The synchronizer meshes with the synchronizer sleeve, driving the synchronizer sleeve to rotate, and the synchronizer sleeve drives the transmission sleeve to rotate through the flat key. By toggling the speed switch, the speed change line pulls the shift shaft to drive the paddle, and the paddle drives the synchronizer to mesh with the left and right synchronizer sleeves. Different bevel gears are installed on the synchronizer sleeves, thereby realizing the change of the transmission ratio, thereby realizing the speed change of the bicycle. When the speed switch 5 is restored to its original state, the synchronizer 28 is restored to its original state under the action of the return spring 29.

[0038] When braking is needed, the brakes 15 on the rear wheel 1 and the front wheel 11 are tightened by the brake handle 7 using the brake line 9, so that the brakes 15 are used to fix the brake discs 12 on the front hub 23 and the rear hub 44, thereby slowing down the rear wheel 1 and the front wheel 11.

[0039] The transmission shaft box 17 is composed of a front end box body, a transmission shaft box body, and a rear end box body. Both ends of the transmission shaft box 17 are flange-shaped and connected to the front and rear boxes by screws. The front end box body and the rear end box body of the transmission shaft box 17 are split, each divided into an upper and a lower part, and the two parts are connected by bolts and nuts.

[0040] The movement is realized by the main shaft 24 driving the synchronizer 28 to rotate, the synchronizer 28 drives the synchronization sleeve 25 to rotate, the synchronization sleeve 25 drives the left transmission sleeve 38 or the right transmission sleeve 41 to rotate through the flat key, the left transmission sleeve 38 and the right transmission sleeve 41 drive the second bevel gear 39 and the first bevel gear 40 to rotate, the second bevel gear 39 and the first bevel gear 40 drive the left transmission shaft 36 and the right transmission shaft 43 to rotate through the meshing of the bevel gears, and transmit the power to the bevel gear shaft 33, the bevel gear shaft 33 drives the rear hub 44 to rotate, and the rear hub 44 drives the rear wheel 1 to rotate, thereby realizing the rear drive of the bicycle.

[0041] The two synchronizing sleeves 25 in the gearbox 30 are respectively connected to the left transmission sleeve 38 and the right transmission sleeve 41 in the transmission case. After the transmission case on one side is missing, when the synchronizer is connected to the synchronizing sleeve on that side, pedaling will not drive the bicycle wheel to rotate, but when it is connected to the synchronizing sleeve on the other side, the transmission system on the corresponding side can still work.

[0042] The above embodiments only express the implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model.

Claims

1. A gear-driven bicycle, comprising a rear wheel (1), a frame (4), a front wheel (11), two transmission shaft boxes (17) and a gearbox (30), characterized in that: The frame (4) is provided with a seat (3), a front fork (10), and a bracket (18); the front fork (10) is connected to the front wheel (11) via a front hub (23); a bracket (18) is installed at the middle of the bottom end of the frame (4); a gearbox (30) is installed on the bracket (18); a transmission shaft box (17) is installed on both sides of the gearbox (30); one end of the transmission shaft box (17) is connected to the rear wheel (1) via a rear hub (44); a main shaft (24) is provided in the middle of the gearbox (30); a first bevel gear (40) is installed at one end of the main shaft (24); A second bevel gear (39) is installed at the other end of the right and left transmission shafts (24); a right transmission shaft (43) is installed inside the transmission shaft box (17) on one side of the frame (4); a left transmission shaft (36) is installed inside the transmission shaft box (17) on the other side of the frame (4); a fourth bevel gear (37) is installed at one end of the right transmission shaft (43) and the left transmission shaft (36); a third bevel gear (34) is installed at the other end of the right transmission shaft (43) and the left transmission shaft (36); a rear wheel shaft is installed inside the rear hub (44); and bevel gear shafts (33) are fixed at both ends of the rear wheel shaft.

2. The gear-driven bicycle according to claim 1, characterized in that: The third bevel gear (34) at the other end of the right transmission shaft (43) and the left transmission shaft (36) is meshed and connected with the bevel teeth at both ends of the bevel gear shaft (33).

3. The gear-driven bicycle according to claim 2, characterized in that: The fourth bevel gear (37) at one end of the left transmission shaft (36) is meshed and connected with the second bevel gear (39) on the main shaft (24), and the fourth bevel gear (37) at one end of the right transmission shaft (43) is meshed and connected with the first bevel gear (40) on the main shaft (24).

4. The gear-driven bicycle according to claim 3, characterized in that: The main shaft (24) is installed in a transmission shaft box (17) through a left transmission shaft sleeve (38), a right transmission shaft sleeve (41) and a shaft sleeve (42); the left transmission shaft (36) and the right transmission shaft (43) are both installed in the transmission shaft box (17) through cylindrical roller bearings (35); and the rear hub (44) is installed on a frame (4).

5. The gear-driven bicycle according to claim 4, characterized in that: The middle section of the main shaft (24) is provided with a spline, and is connected to a synchronizer (28) through the spline. A synchronizer sleeve (25) is sleeved on each of the two ends of the main shaft (24). The synchronizer sleeve (25) is connected to a left transmission sleeve (38) and a right transmission sleeve (41) through a flat key. The synchronizer sleeve (25) is fixed on a deep groove ball bearing (26). One end of the synchronizer sleeve (25) is meshed with the synchronizer (28), and the other end is connected to a transmission shaft box (17). A paddle (31) is installed on the synchronizer (28), and the paddle (31) is connected to a shift shaft (32). A return spring (29) is sleeved on the shift shaft (32).

6. The gear-driven bicycle according to claim 5, characterized in that: Both ends of the main shaft (24) are fixedly connected via a crank (20) and a pedal (19); a support foot (16) is installed on a transmission shaft box (17) on one side of the frame (4); both ends of the gearbox (30) are installed with gearbox end covers (27); both tops of the gearbox (30) are installed with front end upper covers (21); and both bottoms of the gearbox (30) are installed with front end lower covers (22).

7. The gear-driven bicycle according to claim 1, characterized in that: The rear wheel (1) is mounted with a rear upper box (13) and a rear lower box (14); the front fork (10) and the frame (4) are both mounted with a brake (15) via bolts; the front hub (23) and the rear hub (44) are both mounted with a brake disc (12); the brake (15) is connected to a brake handle (7) via a brake line (9); the brake handle (7) is mounted on a bicycle handle (6); the bicycle handle (6) is mounted on the front fork (10); a speed change switch (5) is also mounted on the bicycle handle (6); the speed change switch (5) is connected to a gearbox (30) via a speed change line (8).

8. The gear-driven bicycle according to claim 1, characterized in that: The rear hub (44) is connected to the rear wheel (1) via spokes (2), and the front hub (23) is connected to the front wheel (11) via spokes (2).

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