适用于折叠自行车的变速张紧一体化后拨
The integrated rear derailleur design with integrated gear shifting and tensioning solves the problem of chain slack and detachment during the shifting process of three-fold bicycles, achieving precise gear shifting and convenient folding, and is suitable for modification of derailleurs of various brands.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Filing Date
- 2025-10-09
- Publication Date
- 2026-07-17
AI Technical Summary
The existing three-fold bicycles have a separate design for the derailleur and tensioner, which can easily lead to chain drop and chain loosening during gear shifting, especially when the chain cannot stay taut during rotation and folding.
The rear derailleur with integrated speed change and tensioning uses a combination of guide sprockets and tension sprockets, along with the elastic support of a torsion spring, to ensure that the chain remains taut during speed changes and folding, preventing it from slipping off.
It achieves precise and rapid shifting of bicycle gears, keeps the chain taut during folding to prevent chain slippage, and makes rear wheel disassembly and maintenance more convenient. It is suitable for modification of various brands of derailleurs.
Smart Images
Figure CN224511379U_ABST
Abstract
Claims
1. A derailleur suitable for use with a folding bicycle, the derailleur comprising: a chain tensioner; and a rear derailleur, wherein the chain tensioner and the rear derailleur are integrated. The utility model relates to a bicycle chain tensioning device, including: Clamping arm A (5), fixedly connected with guide shaft (6) on clamping arm A (5), one end of guide shaft (6) is fixedly connected with clamping arm B (7), the middle part rotationally connected with guide sprocket (8) of guide shaft (6); Tensioning shaft (9) is fixed between clamping arm A (5) and clamping arm B (7) one end, the outer side of tensioning shaft (9) is hinged with chain tensioning assembly (10), is used for adjusting the tension of bicycle chain with guide sprocket (8).
2. A derailleur-tensioner integrated rear derailleur suitable for use with a folding bicycle according to claim 1, characterized in that: The chain tensioning assembly (10) includes: Tensioning arm (11), one end rotationally connected with tensioning sprocket (12) of tensioning arm (11) away from tensioning shaft (9), the one end close to tensioning shaft (9) of tensioning arm (11) is equipped with assembly cavity (13), the middle part of assembly cavity (13) is fixedly connected with sleeve (14), and tensioning arm (11) is set on the outside of tensioning shaft (9) through sleeve (14); Elastic member, the elastic member is arranged in the inside of assembly cavity (13), is used for cooperating tensioning arm (11) and continuously tightens bicycle chain.
3. A derailleur-tensioner integrated rear derailleur suitable for use with a folding bicycle according to claim 2, characterized in that: The elastic member includes: Torsion spring (16) is assembled in the inside of assembly cavity (13), the inner wall of assembly cavity (13) is equipped with clamping groove (15), and one end of torsion spring (16) extends to the inside of clamping groove (15), the one end close to torsion spring (16) of clamping arm A (5) is equipped with two mounting holes (17), and the other end of torsion spring (16) is clamped and connected in the inside of one mounting hole (17).
4. A derailleur-tensioner integrated rear derailleur suitable for use with a folding bicycle as defined in claim 1, characterized in that: The one side close to the insertion hole of clamping arm A (5) is fixedly connected with the insertion rod, and the clamping arm A (5) is fixedly connected in the insertion hole through the insertion rod, the insertion rod is equipped with the notches in the one end away from clamping arm A (5).
5. A derailleur-tensioner integrated rear derailleur suitable for use with a folding bicycle as defined in claim 1, characterized in that: The one end close to tensioning shaft (9) of clamping arm B (7) is fixedly connected with limit frame (18).
6. A derailleur-tensioner integrated rear derailleur suitable for use with a folding bicycle as defined in claim 5, characterized in that: The limit frame (18) is L-shaped.
7. A derailleur-tensioner integrated rear derailleur suitable for use with a folding bicycle as defined in claim 2, characterized in that: The one end towards clamping arm A (5) of assembly cavity (13) has the opening.