Variable-diameter gear device of bicycle speed change system
By designing a variable diameter gear device in the bicycle transmission system, the coordination of the positioning disc and the gear adjustment disc can achieve automatic adjustment of the gear diameter, solving the gear shifting jams and safety hazards of traditional transmission systems, and achieving smooth speed change and low-cost maintenance.
Patent Information
- Application Number
- CN202421555644.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-03
- Publication Date
- 2025-05-02
- Estimated Expiration
- 2034-07-03
AI Technical Summary
Traditional bicycle transmission systems have problems such as shifting, complex operation, high cost of continuous-speed transmission technology, difficulty in maintenance and safety hazards.
A variable diameter gear device for a bicycle speed change system is designed. Through the gear sliding between the first positioning disc and the second positioning disc, combined with the distance adjustment of the gear position adjustment disc, the automatic adjustment of the gear diameter is realized, thereby achieving smooth speed change.
It realizes shifting gears without the need for chain jump, avoiding the safety hazards of chain slipping, and the overall structure is simple, low cost and convenient maintenance.
Smart Images
Figure CN222823685U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of bicycles, in particular to a variable diameter gear device of a bicycle speed change system. Background Art
[0002] Traditional bicycle speed-changing systems mainly achieve speed changes by operating the chain to jump between gears of different sizes. However, this speed-changing method has problems such as gear shifting frustration and complicated operation. In addition, although continuously variable speed technology can achieve smoother speed changes, it is costly, difficult to maintain, and prone to safety hazards due to chain slippage.
[0003] Therefore, developing a variable diameter gear device for a bicycle transmission system that can automatically adjust the gear diameter to achieve smooth speed change has important practical significance and broad market prospects.
[0004] Therefore, it is necessary to provide a new variable diameter gear device of a bicycle speed change system to solve the above technical problems. Utility Model Content
[0005] The technical problem solved by the utility model is to provide a variable diameter gear device of a bicycle speed change system which can automatically adjust the gear diameter according to riding requirements to achieve speed change.
[0006] In order to solve the above technical problems, the variable diameter gear device of the bicycle speed change system provided by the utility model includes: a first positioning plate and a second positioning plate, a first one-way ratchet is installed on the first positioning plate, a second one-way ratchet is installed on the second positioning plate, a gear is slid between the first positioning plate and the second positioning plate, the gear includes a plurality of tooth blocks distributed in an annular shape, and the plurality of tooth blocks are slidably connected to the first positioning plate and the second positioning plate, a gear adjustment plate is provided on the side of the second positioning plate away from the first positioning plate, one side of the gear adjustment plate passes through the first positioning plate and the second positioning plate, and the gear is sleeved on the outer side of the gear adjustment plate.
[0007] Preferably, the first positioning plate and the second positioning plate are each provided with six groups of sliding guide holes distributed in a ring shape, and the number of the sliding guide holes in each group is two.
[0008] Preferably, the number of the tooth blocks is six, and two slide seats are fixedly mounted on both sides of the tooth block, and the slide seats slide in corresponding sliding guide holes.
[0009] Preferably, a plurality of convex plates distributed in an annular shape are fixedly mounted on one side of the gear adjustment plate close to the first positioning plate, a plurality of table surfaces are arranged on the convex plates, and the gear sleeves are arranged on the outer sides of the six convex plates.
[0010] Preferably, the first positioning plate and the second positioning plate are both provided with mounting holes, and the convex plate passes through the two corresponding mounting holes.
[0011] Compared with the related art, the variable diameter gear device of the bicycle speed change system provided by the utility model has the following beneficial effects:
[0012] The utility model provides a variable diameter gear device for a bicycle speed change system, which radially limits a gear 3 composed of a plurality of tooth blocks on a first positioning plate 1 and a second positioning plate 4, and directly controls the effective outer diameter of the gear 3 through the distance between a gear adjustment plate 6 and the positioning plates, thereby enabling gear shifting without chain jumping, thereby preventing the chain from slipping and causing safety hazards, and the overall structure is relatively simple, the cost is low, and maintenance is more convenient. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 A schematic structural diagram of a preferred embodiment of a variable diameter gear device of a bicycle speed change system provided by the utility model;
[0014] Figure 2 for Figure 1 Schematic diagram of the burst structure shown;
[0015] Figure 3 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate in the first gear shown;
[0016] Figure 4 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate in the second gear shown;
[0017] Figure 5 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate when in the third gear shown;
[0018] Figure 6 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate when the gear is in the fourth gear shown;
[0019] Figure 7 for Figure 1 The schematic diagram of the structure when installed on a bicycle is shown.
[0020] Numbers in the figure: 1, first positioning plate, 2, first one-way ratchet, 3, gear, 4, second positioning plate, 5, second one-way ratchet, 6, gear adjustment plate, 7, bicycle guide. DETAILED DESCRIPTION
[0021] The utility model is further described below in conjunction with the accompanying drawings and implementation modes.
[0022] Please refer to Figure 1-Figure 7 ,in, Figure 1 A schematic structural diagram of a preferred embodiment of a variable diameter gear device of a bicycle speed change system provided by the utility model; Figure 2 for Figure 1 Schematic diagram of the burst structure shown; Figure 3 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate in the first gear shown; Figure 4 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate in the second gear shown; Figure 5 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate when in the third gear shown; Figure 6 for Figure 1 The schematic diagram of the state structure of the second positioning plate, the gear and the gear adjustment plate when the gear is in the fourth gear shown; Figure 7 for Figure 1 The structure diagram when it is installed on the bicycle is shown. The variable diameter gear device of the bicycle speed change system mainly consists of a first positioning plate 1 and a second positioning plate 4, a first one-way ratchet 2 and a second one-way ratchet 5, a gear 3, a gear adjustment plate 6, and a bicycle guide wheel 7. Among them, the first positioning plate 1 and the second positioning plate 4 are respectively installed on the central axis of the rear wheel of the bicycle through the first one-way ratchet 2 and the second one-way ratchet 5, and the first positioning plate 1 and the second positioning plate 4 are provided with six groups of sliding guide holes distributed in an annular manner. In this embodiment, the number of each group of sliding guide holes is two, and the gear 3 is composed of a plurality of tooth blocks. The width of the sliding guide hole matches that of each tooth block. In this embodiment, there are a total of six tooth blocks, each of which has four protruding slide seats. The width of the sliding guide hole allows the slide seat to pass through and slide on the sliding guide hole. The first positioning plate 1 and the second positioning plate 4 clamp the six tooth blocks through the sliding guide hole, and limit their positions to slide only in the radial direction. There is a mounting hole in the middle of every two sliding guide holes, through which the gear adjustment disk 6 can pass. There are six protruding triangular convex plates on the gear adjustment disk 6, which can pass through the mounting hole in the middle of the sliding guide holes, limiting the gear adjustment disk 6 to only slide axially. The inclined surface of the convex plate contacts the six gears 3, and four countertops are provided on the inclined surface for limiting the position of the gear 3.
[0023] The working principle of the variable diameter gear device of the bicycle speed change system provided by the utility model is as follows:
[0024] The steel wire of the bicycle is connected to the gear adjustment disk 6. The distance between the gear adjustment disk 6 and the first positioning disk 1 and the second positioning disk 4 is controlled by adjusting the steel wire. The convex plate of the gear adjustment disk 6 pushes the gear 3 to move radially between the first positioning disk 1 and the second positioning disk 4, thereby changing the effective diameter between the gears 3. When the gear diameter needs to be increased, the gear adjustment disk 6 moves toward the first positioning disk 1 and the second positioning disk 4 to reduce the gap between the two; when the gear diameter needs to be reduced, the gear adjustment disk 6 moves outward to increase the gap between the two, and the convex platform of the gear adjustment disk 6 is designed with four limit platforms, i.e., four gears, to limit its fixed diameter so that it can match the chain.
[0025] Positioning and fixing: There are several sliding guide holes distributed in an annular pattern on the first positioning plate 1 and the second positioning plate 4, and each sliding guide hole has a limited size. The convex plate of the gear adjustment plate 6 is provided with a table surface for fixing the diameter of the gear, ensuring that the gear 3 will not shake or fall off during the speed change process.
[0026] Compared with the related art, the variable diameter gear device of the bicycle speed change system provided by the utility model has the following beneficial effects:
[0027] The utility model provides a variable diameter gear device for a bicycle speed change system, which radially limits a gear 3 composed of a plurality of tooth blocks on a first positioning plate 1 and a second positioning plate 4, and directly controls the effective outer diameter of the gear 3 through the distance between a gear adjustment plate 6 and the positioning plates, thereby enabling gear shifting without chain jumping, thereby preventing the chain from slipping and causing safety hazards, and the overall structure is relatively simple, the cost is low, and maintenance is more convenient.
[0028] The above description is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A variable diameter gear device for a bicycle speed change system, characterized in that: include: A first positioning plate and a second positioning plate, a first one-way ratchet is installed on the first positioning plate, a second one-way ratchet is installed on the second positioning plate, a gear is slidably provided between the first positioning plate and the second positioning plate, the gear includes a plurality of tooth blocks distributed in a ring shape, and the plurality of tooth blocks are slidably connected to the first positioning plate and the second positioning plate, a gear adjustment plate is provided on a side of the second positioning plate away from the first positioning plate, one side of the gear adjustment plate passes through the first positioning plate and the second positioning plate, and the gear is sleeved on the outer side of the gear adjustment plate.
2. The variable diameter gear device of the bicycle speed change system according to claim 1, characterized in that: The first positioning plate and the second positioning plate are each provided with six groups of sliding guide holes distributed in a ring shape, and the number of the sliding guide holes in each group is two.
3. The variable diameter gear device of the bicycle speed change system according to claim 2, characterized in that: The number of the tooth blocks is six, and two slide seats are fixedly installed on both sides of the tooth block, and the slide seats slide in corresponding sliding guide holes.
4. The variable diameter gear device of the bicycle speed change system according to claim 1, characterized in that: A plurality of convex plates distributed in an annular shape are fixedly mounted on one side of the gear adjustment plate close to the first positioning plate, a plurality of table surfaces are arranged on the convex plates, and the gear sleeves are arranged on the outer sides of the six convex plates.
5. The variable diameter gear device of the bicycle speed change system according to claim 4, characterized in that: The first positioning plate and the second positioning plate are both provided with mounting holes, and the convex plate passes through two corresponding mounting holes.