A chainless geared bicycle derailleur

Abstract

This utility model discloses a chainless geared bicycle derailleur, belonging to the field of bicycle gear shifting technology. It includes: a large gear assembly (first, second, third, and fourth large gears fixed to a large disc and distributed from the outside to the inside), a small gear assembly (first, second, third, and fourth small gears with teeth on the inside and outside respectively meshing with the large gears; one-way gears can also be used), a bearing rod assembly (a telescopic bearing rod with a one-way latch, driving only one small gear to rotate), and a gear shifting control system (the gear lever drives the bearing rod to switch gears left and right via a connecting line and an automatically returning intermediate connecting rod). By switching the meshing of different small gears with the large gears, multi-gear shifting is achieved, solving the problem of traditional chains easily falling off, ensuring smooth gear shifting, meeting the needs of climbing and accelerating, and enhancing the riding experience.

Description

Technical Field

[0001] This utility model belongs to the field of bicycle gearbox technology, specifically relating to a chainless geared bicycle gearbox. Background Technology

[0002] Traditional bicycles mostly use chain-driven gear transmission, which has drawbacks such as easy chain slippage and complicated maintenance, affecting the riding experience. At the same time, chainless bicycle gear shifting devices are relatively rare, making it difficult to meet the needs of multi-gear and smooth gear changes. The limitations of traditional structures are even more prominent in scenarios such as climbing hills and accelerating. Utility Model Content

[0003] The present invention aims to solve the above problems by providing a chainless geared bicycle transmission with smooth multi-gear shifting and no risk of chain slippage, thereby improving riding convenience and enjoyment.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] A chainless geared bicycle derailleur includes:

[0006] The large gear assembly includes a first large gear, a second large gear, a third large gear, and a fourth large gear, which are fixed on the same large disk and distributed sequentially from the outer side of the large disk to the center.

[0007] The pinion assembly includes a first pinion, a second pinion, a third pinion, and a fourth pinion. The first pinion meshes with a first large gear, the second pinion meshes with a second large gear, the third pinion meshes with a third large gear, and the fourth pinion meshes with a fourth large gear. The first pinion, the second pinion, the third pinion, and the fourth pinion are gears with teeth on both the inside and outside.

[0008] A bearing rod assembly includes a bearing rod that can extend and retract along its own axis. The bearing rod is provided with a one-way buckle. When the bearing rod rotates forward, the one-way buckle engages with the internal teeth of the pinion to drive the corresponding pinion to rotate. When the bearing rod moves, the one-way buckle can retract to switch the engagement with different pinions.

[0009] The transmission control system includes a gear lever, a connecting cable, and a transfer connecting rod. The gear lever drives the transfer connecting rod to move via the connecting cable. The transfer connecting rod pushes the bearing rod to move left and right along the axis to switch the engagement with the first pinion, the second pinion, the third pinion, and the fourth pinion. The transfer connecting rod automatically returns to its original position after being released.

[0010] Furthermore, the first pinion, the second pinion, the third pinion, and the fourth pinion are unidirectional gears.

[0011] Furthermore, the first, second, third, and fourth large gears are arranged in concentric circles on the large disk, with their radii decreasing sequentially.

[0012] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0013] 1. Gear transmission is used, and the multi-speed shifting is smooth and easy to operate;

[0014] 2. Chainless design completely solves the "chain falling off" problem;

[0015] 3. Multiple gears adapt to scenarios such as climbing hills and accelerating, enhancing the riding experience and convenience. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the gear transmission part in this utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the small gear in this utility model;

[0018] Figure 3 This is a schematic diagram of the speed control system structure in this utility model. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] In the description of the embodiments of this utility model, it should be noted that if terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," or "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, terms such as "first," "second," and "third" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0021] Furthermore, the use of terms such as "horizontal," "vertical," and "sag" does not imply that the component must be absolutely horizontal or suspended, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0022] In the description of the embodiments of this utility model, "a plurality of" means at least two.

[0023] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" 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 according to the specific circumstances.

[0024] Example:

[0025] like Figure 1-3 As shown, the present invention provides a chainless geared bicycle derailleur, comprising the following components:

[0026] Large gear assembly: includes a first large gear A, a second large gear B, a third large gear C, and a fourth large gear D fixed on the same large disk; the four large gears are distributed sequentially from the outside to the center of the large disk, forming a concentric gear structure with different radii.

[0027] The pinion assembly includes a first pinion A1, a second pinion B1, a third pinion C1, and a fourth pinion D1, which mesh with the first large gear A, the second large gear B, the third large gear C, and the fourth large gear D, respectively. The pinions are gears with teeth on both the inner and outer sides. One-way gears can also be used to improve the smoothness of transmission. However, it is also possible to achieve this without one-way gears, as long as the gears on the bicycle's concentric shaft are one-way.

[0028] Bearing rod assembly: includes a bearing rod 100 that can retract and extend along its own axis. The bearing rod 100 is provided with a one-way buckle. When the bearing rod rotates forward, the one-way buckle locks onto the internal teeth of the pinion (driving the corresponding pinion to rotate), and the one-way buckle can retract freely when the bearing rod moves (to achieve switching between different pinions).

[0029] The gear shift control system includes a gear lever 200, a connecting cable 300, and a transfer connecting rod 400. The gear lever 200 can be installed in any position on the bicycle. When rotating forward / reverse, the connecting cable 300 drives the transfer connecting rod 400 to move left and right. The transfer connecting rod moves one gear each time it is pulled and automatically returns to its original position when released, thereby pushing the bearing rod to switch gears axially.

[0030] Working principle

[0031] When the bearing rod drives the first pinion to rotate, the first large gear (the outermost ring of the large disc) is subjected to force, and the transmission ratio is the largest (the least effort is required, but the large disc rotates the slowest), which is suitable for climbing slopes.

[0032] The bearing rod is pushed toward the center of the large disc, which in turn drives the second and third small gears to mesh with the corresponding second and third large gears, and the speed of the large gear gradually increases.

[0033] When the bearing rod moves to the far right, it drives the fourth pinion to mesh with the fourth large gear (the innermost part of the large disc), resulting in the smallest transmission ratio (the largest disc rotates the fastest), thus achieving speed increase.

[0034] In the reverse direction, the rotation of the large disc can also drive the bearing rod through gear meshing. The movement of the bearing rod can change the rotation speed, flexibly adapting to the riding conditions.

[0035] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A chainless geared bicycle derailleur, characterized in that, include: The large gear assembly includes a first large gear, a second large gear, a third large gear, and a fourth large gear, which are fixed on the same large disk and distributed sequentially from the outer side of the large disk to the center. The pinion assembly includes a first pinion, a second pinion, a third pinion, and a fourth pinion. The first pinion meshes with a first large gear, the second pinion meshes with a second large gear, the third pinion meshes with a third large gear, and the fourth pinion meshes with a fourth large gear. The first pinion, the second pinion, the third pinion, and the fourth pinion are gears with teeth on both the inside and outside. A bearing rod assembly includes a bearing rod that can extend and retract along its own axis. The bearing rod is provided with a one-way buckle. When the bearing rod rotates forward, the one-way buckle engages with the internal teeth of the pinion to drive the corresponding pinion to rotate. When the bearing rod moves, the one-way buckle can retract to switch the engagement with different pinions. The transmission control system includes a gear lever, a connecting cable, and a transfer connecting rod. The gear lever drives the transfer connecting rod to move via the connecting cable. The transfer connecting rod pushes the bearing rod to move left and right along the axis to switch the engagement with the first pinion, the second pinion, the third pinion, and the fourth pinion. The transfer connecting rod automatically returns to its original position after being released.

2. The chainless geared bicycle derailleur according to claim 1, characterized in that: The first pinion, the second pinion, the third pinion, and the fourth pinion are unidirectional gears.

3. A chainless geared bicycle derailleur according to claim 1, characterized in that: The first, second, third, and fourth large gears are arranged in concentric circles on the large disk, with their radii decreasing sequentially.

Images