Bicycle transmission mechanism
By designing a single transmission mechanism, the problem of excessive length in traditional tandem bicycles has been solved, achieving a bicycle length similar to that of a single bicycle, thus improving riding flexibility and effort reduction.
Patent Information
- Application Number
- CN202522290858.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-29
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-10-29
AI Technical Summary
Traditional tandem bicycles have two drive mechanisms, resulting in a longer bicycle length, poor maneuverability, and an impact on other cyclists.
It adopts a single transmission mechanism, including a main chain wheel, axle, pedals and a bevel gear, and through chain drive and meshing gear structure, the length of the tandem bicycle is similar to that of the single bicycle, improving flexibility.
The bicycle is similar in length to a single-person bicycle, which improves riding flexibility, reduces the impact on other cyclists, and makes tandem riding more energy-efficient.
Smart Images
Figure CN224676331U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of transmission mechanism technology, specifically a bicycle transmission mechanism. Background Technology
[0002] Traditional tandem bicycles have two drive mechanisms, each of which can drive the bicycle to move. However, because tandem bicycles have two drive mechanisms, their installation requires more space, resulting in a longer length. As the length increases, the bicycle's maneuverability decreases, and the longer bicycle also has a greater impact on riders around it. Utility Model Content
[0003] The purpose of this invention is to provide a bicycle transmission mechanism that addresses the problems mentioned in the background section.
[0004] To achieve the above objectives, the present invention adopts the following technical solution: the bicycle transmission mechanism includes a mounting frame, a rotating shaft, a main sprocket, and a driven sprocket. The main sprocket is rotatably connected to the rotating shaft, and the main sprocket and the driven sprocket are driven by a chain. The main sprocket has grooves on both sides, and fixed helical toothed discs are installed inside the grooves. A main conical gear disk is respectively provided on the rotating shaft and on both sides of the main sprocket disk. A driven conical gear disk is provided on the mounting bracket. The driven conical gear disk is located between the two main conical gear disks and is engaged with both main conical gear disks at the same time. The two ends of the rotating shaft are respectively rotatably connected to a pedal, and the two ends of the pedal are respectively rotatably connected to a pedal. The pedal is connected to the main bevel gear disk through a screw and a nut. A movable helical gear disk that engages with a fixed helical gear disk is provided on one side of the main conical gear disk. A plurality of fixed rods that pass through and slide in connection with the main conical gear disk are provided on one side of the movable helical gear disk. A stop block is provided at one end of the fixed rod. A spring is sleeved on the fixed rod. The spring is located between the main conical gear disk and the movable helical gear disk.
[0005] Preferably, two limiting blocks are provided on the outer side of the main conical gear disk, and the two limiting blocks are used to limit the amplitude of the pedal swinging up and down.
[0006] Preferably, the vertical swing amplitude of the pedal is 40° to 50°.
[0007] Preferably, the width between the two pedals is 15cm to 25cm.
[0008] Preferably, the pedal, main conical gear disk, driven conical gear disk, fixed helical gear disk, and movable helical gear disk are all made of aluminum alloy.
[0009] The beneficial effects of this utility model are: Because this bicycle has only one transmission mechanism, its length is basically the same as that of a regular single-person bicycle, which improves the flexibility of riding the bicycle, meets the needs of two people riding together, and also reduces the impact on other cyclists. Attached Figure Description
[0010] Figure 1 This is a structural schematic diagram of a specific embodiment of the present utility model.
[0011] Figure 2 This is a schematic diagram of the transmission mechanism.
[0012] Figure 3 yes Figure 2 A top view of the current state.
[0013] Figure 4 This is an exploded view of the transmission mechanism.
[0014] In the diagram: 1. Bicycle; 2. Mounting bracket; 3. Axle; 4. Main sprocket; 5. Chain; 6. Groove; 7. Fixed helical gear; 8. Main bevel gear; 9. Driven bevel gear; 10. Pedal; 11. Pedal; 12. Screw; 13. Nut; 14. Movable helical gear; 15. Fixed rod; 16. Stop; 17. Spring; 18. Limiting block. Detailed Implementation
[0015] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings.
[0016] like Figure 1-4 As shown, a bicycle transmission mechanism includes a mounting bracket 2, a rotating shaft 3, a main sprocket 4, and a driven sprocket. The main sprocket 4 is rotatably connected to the rotating shaft 3, and the main sprocket 4 and the driven sprocket are driven by a chain 5. The main sprocket 4 has grooves 6 on both sides, and a fixed helical toothed disc 7 is installed inside the grooves 6; A main conical gear disk 8 is provided on the rotating shaft 3 and on both sides of the main sprocket disk 4. A secondary conical gear disk 9 is provided on the mounting bracket 2. The secondary conical gear disk 9 is located between the two main conical gear disks 8 and is engaged with both main conical gear disks 8 at the same time. The two ends of the rotating shaft 3 are respectively rotatably connected to the pedal 10, and the two ends of the pedal 10 are respectively rotatably connected to the pedal 11. The pedal 10 is connected to the main bevel gear disk 8 through the screw 12 and the nut 13. A movable helical gear disk 14 that engages with a fixed helical gear disk 7 is provided on one side of the main conical gear disk 8. Several fixed rods 15 that pass through and slide in connection with the main conical gear disk 8 are provided on one side of the movable helical gear disk 14. A stop block 16 is provided at one end of the fixed rod 15. A spring 17 is sleeved on the fixed rod 15. The spring 17 is located between the main conical gear disk 8 and the movable helical gear disk 14.
[0017] The transmission mechanism used in this bicycle 1 is suitable for two-person cooperative riding of the bicycle 1, for recreational purposes.
[0018] When riding on the course, two people sit on the seat and the back seat of bicycle 1, respectively. The two people first start moving bicycle 1, or the person in front steps on the two front pedals 11 while the person behind uses their brace to keep the bicycle 1 stable. Then, the person in front begins to step down on the higher pedal 11. As the pedal 11 is pressed down, it drives the pedal lever 10 to rotate around the pivot 3. At the same time, the pedal lever 10 drives the main bevel gear 8 to rotate through the engagement of the screw 12 and the nut 13. When the main bevel gear 8 rotates, it can drive the driven bevel gear 9 to rotate through meshing with the driven bevel gear 9. The driven bevel gear 9 can drive the other main bevel gear 8 to rotate. Due to the transmission through the driven bevel gear 9, the two main bevel gear 8 rotate in opposite directions, that is, one of the two front pedals 11 will move upward and the other downward.
[0019] Furthermore, when the main bevel gear 8 rotates, the movable helical gear 14 on its side will be engaged with the fixed helical gear 7 on the side of the main sprocket 4 under the action of the spring 17, thereby driving the main sprocket 4 to rotate. When the main sprocket 4 rotates, it can drive the sprocket to rotate through the chain 5, thereby making the bicycle 1 move, that is, the bicycle 1 can be ridden.
[0020] When one of the movable helical gears 14 is engaged with the fixed helical gear 7, since the other movable helical gear 14 rotates in the opposite direction to the first movable helical gear 14, the movable helical gear 14 will remain in contact with the fixed helical gear 7, thereby compressing the spring 17. Therefore, when the bicycle 1 is riding forward normally, only one set of movable helical gears 14 and fixed helical gear 7 can remain engaged, while the other set of movable helical gears 14 and fixed helical gear 7 cannot remain engaged, thus not affecting the reciprocating up-and-down swing of the pedal 10.
[0021] In this bicycle 1, the two riders, one in front and one in back, respectively pedal the two front pedals 11 and the other in back pedals 11. Both of their movements cause the main chain wheel 4 to rotate in the forward direction, enabling the bicycle 1 to be ridden normally. Therefore, it can save pedaling effort and make riding more convenient. At the same time, since the pedals of both riders are located near the main chain wheel 4, while traditional tandem bicycles 1 have two independent pedal transmission mechanisms and a longer overall length, this bicycle 1 only has one transmission mechanism, which can achieve the effect of two people riding together. At the same time, it can keep the length of the bicycle 1 basically the same as that of a conventional single bicycle 1, improving the riding flexibility of the bicycle 1.
[0022] Furthermore, two limiting blocks 18 are provided on the outer side of the main bevel gear disk 8. The two limiting blocks 18 are used to limit the range of vertical swing of the pedal 10, so as to avoid excessive rotation of the pedal 10 and cause excessive bending of the rider's legs, thereby improving riding comfort.
[0023] Furthermore, the pedal 10 swings up and down by an amplitude of 40° to 50°.
[0024] Furthermore, the width between the two pedals 10 is 15cm to 25cm to ensure that there is sufficient space between the rider's legs.
[0025] Furthermore, the pedal 10, the main bevel gear disk 8, the secondary bevel gear disk 9, the fixed helical gear disk 7, and the movable helical gear disk 14 are all made of aluminum alloy.
[0026] When bicycle 1 encounters a jamming problem while riding, it is necessary to check the condition of the parts in time, and apply lubricating grease to each transmission component in time to improve the smoothness of riding.
[0027] The speed of this type of bicycle 1 should not be too fast. It is recommended that the speed for two people riding together be below 25km / h. At the same time, this type of bicycle 1 with this transmission mechanism also allows single-person riding. The rider can move the bicycle 1 by controlling the two front pedals 11 to move up and down alternately.
[0028] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
Claims
1. A bicycle transmission mechanism, comprising a mounting bracket, a shaft, a main sprocket, and a driven sprocket, wherein the main sprocket is rotatably connected to the shaft, and the main sprocket and the driven sprocket are driven by a chain, characterized in that: The main sprocket has grooves on both sides, and fixed helical toothed discs are installed inside the grooves. A main conical gear disk is respectively provided on the rotating shaft and on both sides of the main sprocket disk. A driven conical gear disk is provided on the mounting bracket. The driven conical gear disk is located between the two main conical gear disks and is engaged with both main conical gear disks at the same time. The two ends of the rotating shaft are respectively rotatably connected to a pedal, and the two ends of the pedal are respectively rotatably connected to a pedal. The pedal is connected to the main bevel gear disk through a screw and a nut. A movable helical gear disk that engages with a fixed helical gear disk is provided on one side of the main conical gear disk. A plurality of fixed rods that pass through and slide in connection with the main conical gear disk are provided on one side of the movable helical gear disk. A stop block is provided at one end of the fixed rod. A spring is sleeved on the fixed rod. The spring is located between the main conical gear disk and the movable helical gear disk.
2. The bicycle transmission mechanism according to claim 1, characterized in that, Two limiting blocks are provided on the outer side of the main conical gear disk, and the two limiting blocks are used to limit the range of vertical swing of the pedal.
3. The bicycle transmission mechanism according to claim 2, characterized in that, The pedal swings up and down with an amplitude of 40° to 50°.
4. The bicycle transmission mechanism according to claim 1, characterized in that, The width between the two pedals is 15cm to 25cm.
5. The bicycle transmission mechanism according to claim 1, characterized in that, The pedal, main conical gear disk, secondary conical gear disk, fixed helical gear disk, and movable helical gear disk are all made of aluminum alloy.