Energy-saving bicycle continuously variable transmission

Abstract

The present application relates to a kind of continuously variable transmission, especially a kind of energy-saving bicycle continuously variable transmission.The present application is mainly composed of box, driving shaft, driving disc key shaft, driving disc, self-tightening disc device, passive disc key shaft, passive disc, friction wheel, friction wheel support, guide rail, reset device, speed regulator, cable, cable tube, the compression device originally arranged in the both ends of driving disc is changed to utilize roller and inclined plane to generate strong self-tightening clamping force, so that greater friction force is generated between driving disc, friction wheel and passive disc, the present application utilizes self-tightening disc device to generate strong friction force to transmit torque, and the transmitted torque is greater than that of the comparative patent, so that it is more labor-saving when riding, after using the present application technology on bicycle, it is more labor-saving when riding, the energy-saving effect is better, the structure is also simple, the cost is low, and installation is also convenient.

Description

Technical Field

[0001] This invention relates to a continuously variable transmission (CVT), and more particularly to an energy-saving CVT for bicycles. Background Technology

[0002] Currently, there is a type of bicycle on the market called New Vinci continuously variable transmission (CVT). Its compact gear structure and ease of use have earned it widespread praise. However, its complex structure and cumbersome processing result in high manufacturing costs and selling prices, limiting its market share. Shanghai Xineng Gongyan Technology Intelligent Partnership applied for a patent in 2023 (a type of continuously variable transmission for bicycles, 2023100811509), which features a unique structure. In this structure, the friction force driving the driven disc is generated by the pressure of the outermost two pressure rollers. One side of the pressure roller is pressed against the driven disc, while the other side is pressed against the outer shell. However, the disadvantages of this structure are that the pressure force generated by the spring is not large, resulting in relatively low friction. Furthermore, due to the frictional resistance between the pressure roller, the outer shell, and the driven disc, energy consumption is high, parts are easily damaged, and installation is also cumbersome. Summary of the Invention

[0003] The purpose of this invention is to introduce an improved energy-saving continuously variable transmission (CVT) for bicycles. This transmission has a simple structure, no friction between itself and the outer casing, makes riding easier, is easy to manufacture and assemble, has low cost, and has significant economic benefits.

[0004] This invention is implemented in the following manner: The invention mainly comprises a housing, a drive shaft, a drive disc keyshaft, a drive disc, a self-tightening disc device, a driven disc keyshaft, a driven disc, a friction wheel, a friction wheel bracket, a guide rail, a reset device, a speed regulator, a cable, and a cable tube. The housing is composed of two parts and has symmetrical parallel drive shaft holes and driven disc keyshaft holes. Several driven discs are fitted onto the driven disc keyshaft via keyways. The driven disc keyshaft is installed inside the housing, with its two ends fitted into the driven disc keyshaft holes. The drive disc and driven disc are installed parallel to each other and interlocked inside the housing. The interlocking positions of the drive disc and driven disc... The device comprises a friction wheel arranged radially, a guide rail housed within the housing, and friction wheels movably fixed to a friction wheel bracket, which in turn is movably fixed to the guide rail. The friction wheel bracket is moved along the guide rail by a cable and a reset device. A speed controller drives the cable. The device is characterized by: several drive discs mounted on drive disc key shafts via keyways; two sets of self-tightening disc devices respectively located at both ends of the drive discs; a hole on one side of each self-tightening disc device is fixed to the drive shaft via a pin, while a hole on the other side is mounted on the drive disc key shaft via a keyway; the drive shaft is fitted with drive disc key shafts and installed within the housing, with both ends located within drive shaft holes. Each self-tightening disc device consists of rollers and a set of inclined discs, with a relative rotation angle of less than 45 degrees between the two discs. The housing is equipped with a bracket device for fixing to the bicycle frame. A sprocket is directly mounted on the driven disc key shaft, or the sprocket is driven by a bridge gear or planetary gear. The reset device is a reset spring or a reset cable. Compared with the prior art, the present invention has the following characteristics:

[0005] 1. Simple structure; 2. Low cost; 3. Easy to manufacture; 4. High power transmission. Attached Figure Description

[0006] Figure 1 This is a structural diagram of a specific embodiment of the present invention.

[0007] Figure 2 This is a sectional view (A-A') of a specific embodiment of the present invention.

[0008] Figure 3 This is a rendering of the invention installed on a bicycle according to a specific embodiment. Specific implementation methods

[0009] Specific embodiments of the present invention, for example Figure 1 , Figure 2As shown, it mainly consists of a housing 1, a drive shaft 2, a drive disc keyshaft 3, a drive disc 4, a self-tightening disc device 5, a driven disc keyshaft 6, a driven disc 7, a friction wheel 8, a friction wheel bracket 9, a guide rail 10, a reset device 11, a speed controller 12, a cable 13, and a cable tube 14. The housing 1 is composed of two parts and has symmetrical parallel drive shaft holes and driven disc keyshaft holes. Several driven discs 7 are fitted onto the driven disc keyshaft 6 through keyways. The driven disc keyshaft 6 is installed inside the housing 1, with its two ends fitted into the driven disc keyshaft holes. The drive disc 4 and driven disc 7 are installed parallel to each other and interlocked inside the housing 1. Friction wheels are radially arranged between the drive disc 4 and driven disc 7 at the interlocking positions. 8. The guide rail 10 is set inside the housing 1. The friction wheel 8 is movably fixed on the friction wheel bracket 9, which is in turn movably fixed on the guide rail 10. The friction wheel bracket 9 is driven to move on the guide rail 10 by the cable 13 and the reset device 11. The speed regulator 12 drives the cable 13 to work. The feature is that several driving discs 4 are fitted onto the driving disc key shaft 3 via keyways. Two sets of self-tightening disc devices 5 are respectively set at both ends of the driving discs 4. One hole of the self-tightening disc device 5 is fixed to the driving shaft 2 by a pin, while the other hole is fitted onto the driving disc key shaft 3 via a keyway. The driving shaft 2 is fitted with the driving disc key shaft 3 and installed inside the housing 1, with both ends located in the driving shaft holes. The self-tightening disc device 5 consists of rollers and a set of inclined discs, with a relative rotation angle of less than 45 degrees between the two discs. The self-tightening disc device 5 consists of several inclined discs and rollers, with a relative rotation angle of less than 45 degrees between the two discs. The housing 1 is equipped with a bracket device 16 fixed to the bicycle frame 15. A sprocket 17 is directly mounted on the passive key shaft 6, or driven by a bridge gear or planetary gear. The reset device 11 is a reset spring or a reset cable. In this embodiment, the friction wheel 8 is mounted on a friction wheel bracket 9, which is movably mounted on a guide rail 10 inside the housing 1 and is moved back and forth by the speed controller 12, cable 13, cable tube 14, and reset device 11. The reset device 11 adopts a reset spring structure, a reset cable, or other reset structure; such as... Figure 1 , Figure 2As shown, in the initial position, the speed controller 12 is in its minimum position, and there is no tension on the cable 13. The reset device 11, under the action of the return spring, pulls the friction wheel bracket 9 back to the initial position (i.e., on the right side, near the axis of the drive shaft 2). When riding for the first time, the pedal 18 drives the drive shaft 2 to rotate. The drive shaft 2 drives the outer disc of the self-tightening disc device 5 at both ends to rotate. Since the self-tightening disc device 5 consists of rollers and a set of discs with inclined surfaces, or the self-tightening disc device 5 consists of several discs with inclined surfaces and rollers (the function of the rollers is to reduce friction), and there is a rotation angle of less than 45 degrees between the two discs, and the rollers and inclined surfaces correspond to each other, when the outer disc of the self-tightening disc device 5 (fixed to the drive shaft 2 by a pin) is in When the drive shaft 2 rotates, the disc on the other side of the self-tightening disc device 5, which is stuck on the key shaft 3 of the drive disc, does not rotate due to resistance. The inclined surface and roller on it will squeeze the other side of the self-tightening disc device 5 to one side when the self-tightening disc device 5 rotates relative to it. In this way, the two self-tightening disc devices 5 at both ends will squeeze the other side of the self-tightening disc device 5 towards the middle. The gaps between the various self-tightening disc devices 5, the drive disc 4, the driven disc 7, and the friction wheel 8 will disappear as the self-tightening disc devices 5 rotate relative to each other and squeeze. Friction will be generated between the drive disc 4, the friction wheel 8, and the driven disc 7. As the drive shaft 2 continues to rotate and the self-tightening disc device 5 continues to act, the squeezing force will increase. In this way, the drive disc 4 can transmit power through friction. On the driven chainring 7, the gear shifting works as follows: the driving chainring 4 continues to rotate. Since the friction wheel 8 is in its initial position (near the center of the drive shaft 2), the radius of the driving chainring 4 is very small, and its linear velocity is also very low. Similarly, the linear velocity of the driven chainring 7, which is in contact with the friction wheel 8, is also very low. However, this contact point is relatively far from the center of the driven chainring key shaft 6. Therefore, the rotational speed of the driven chainring 7 driven by the friction wheel 8 is much lower than that of the driving chainring 4. Consequently, the rotational speed of the sprocket 17 driven by the driven chainring key shaft 6 is also lower, resulting in a slower bicycle speed. Because this is a situation where the smaller wheel drives the larger wheel, although the speed is slow, it requires very little effort. Once the bicycle starts moving, as... As the rider pedals, the drive chainring 4 rotates. Gradually increasing the speed setting 12 moves the friction wheel bracket 9 to the left via the cable 13. As a result, the friction wheel 8 moves further away from the axis of the drive chainring key shaft 3. The further away from the axis of the drive chainring key shaft 3, the higher its linear velocity, and the faster the friction wheel 8 rotates. Conversely, the friction wheel 8 moves closer and closer to the axis of the driven chainring key shaft 6. Compared to the initial position at the edge of the driven chainring 7, as the friction wheel 8 rotates faster and faster, it gets closer to the axis of the driven chainring key shaft 6. Because the linear velocity is higher at this point, the rotation speed of the driven chainring 7 also increases. Therefore, by increasing the speed setting 12 while keeping the pedaling speed constant, the rotation speed of the driven chainring 7 can be increased, making the bicycle go faster and faster.When the speed regulator is downshifted to gear 12, the friction wheel 8 gradually moves away from the axis of the driven disc key shaft 6 and towards the axis of the driving disc key shaft 3 under the action of the reset device 11. The distance between the friction wheel 8 and the driving disc key shaft 3 also becomes smaller and smaller, and the linear velocity of the friction wheel 8 slows down. As a result, the rotation speed of the driven disc 5 also slows down, and the speed of the bicycle also slows down as the rotation speed of the driven disc 7 decreases. Figure 3 This is a rendering of the invention installed on a bicycle.

[0010] The present invention has a simple and reliable structure, is easy to manufacture and assemble, has low cost and selling price, and has considerable economic benefits. Compared with the comparative patent, it eliminates friction and saves physical effort.

Claims

1. An energy-saving continuously variable transmission (CVT) for bicycles, mainly composed of a housing (1), a drive shaft (2), a drive disc key shaft (3), a drive disc (4), a self-tightening disc device (5), a driven disc key shaft (6), a driven disc (7), a friction wheel (8), a friction wheel bracket (9), a guide rail (10), a reset device (11), a speed regulator (12), a cable (13), and a cable tube (14). The housing (1) is composed of two parts and has symmetrical parallel drive shaft holes and driven disc key shaft holes. Several driven discs (7) are fitted onto the driven disc key shaft (6) through keyways. The driven disc key shaft (6) is mounted on... Inside the housing (1), both ends are fitted into the key shaft holes of the driven disc. The driving disc (4) and the driven disc (7) are installed parallel to each other and interlocked inside the housing (1). A friction wheel (8) is radially provided between the driving disc (4) and the driven disc (7) at the interlocked position. The guide rail (10) is set inside the housing (1). The friction wheel (8) is movably fixed on the friction wheel bracket (9). The friction wheel bracket (9) is movably fixed on the guide rail (10). The friction wheel bracket (9) is driven to move on the guide rail (10) by the cable (13) and the reset device (11). The speed regulator (12) drives the cable (13) to work. Its characteristics are: Several drive discs (4) are fitted onto the drive disc key shaft (3) via keyways. Two sets of self-tightening disc devices (5) are respectively set at both ends of several drive discs (4). The hole on one side of the self-tightening disc device (5) is fixed to the drive shaft (2) by a pin, while the hole on the other side is fitted onto the drive disc key shaft (3) via a keyway. The drive shaft (2) is fitted with the drive disc key shaft (3) and installed inside the housing (1), with both ends located in the drive shaft hole.

2. The energy-saving continuously variable transmission for bicycles according to claim 1, characterized in that: The self-tightening disc device (5) consists of rollers and a set of discs with inclined surfaces, with a relative rotation angle of less than 45 degrees between the two discs.

3. The energy-saving continuously variable transmission for bicycles according to claim 1, characterized in that: The self-tightening disc device (5) consists of several inclined discs and rollers, with a relative rotation angle of less than 45 degrees between the two discs.

4. The energy-saving continuously variable transmission for bicycles according to claim 1, characterized in that: The housing (1) is provided with a bracket device (16) for fixing to the bicycle frame (15).

5. The energy-saving continuously variable transmission for bicycles according to claim 1, characterized in that: The sprocket (17) is directly mounted on the passive key shaft (6) or driven by a bridge gear or planetary gear.

6. The energy-saving continuously variable transmission for bicycles according to claim 1, characterized in that: The reset device (11) is a reset spring or a reset cable.

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