Bicycle Rear Derailleur Bracket Axial Arm Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The usability of existing rear derailleur systems for bicycles is limited by their rigidity, weight, and the ease of adjustment and attachment to the frame, which affects the overall performance and user experience.
Innovation Solution
A bracket device with a base element, movable element, and linkage mechanism is designed for mounting the rear derailleur, featuring a frame attachment end and derailleur attachment end, with specific arm configurations and fastener elements that enhance rigidity, reduce weight, and facilitate easy adjustment and attachment, including an angular position adjustment structure for optimal orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the rear derailleur is mounted on a single arm, then the structure is simple, but the rigidity is insufficient
Solution Approach 1:
The bracket device is divided into multiple arms (first arm and second arm) that are spaced apart from each other in the axial direction. Each arm has its own attachment opening through which the rear-wheel axis passes, creating a distributed structural configuration that enhances rigidity while maintaining simplicity
Solution Approach 2:
The patent transitions from a single-arm configuration to a multi-arm configuration where arms are arranged in the axial direction. This dimensional arrangement creates spacing between arms, forming a more rigid structure that can better support the rear derailleur while keeping the overall design simple
2Ease of operation
If the rear derailleur projects more from the axial center plane, then the adjustment range is larger, but the usability is reduced
Solution Approach 1:
The patent employs asymmetric positioning of the arms relative to the axial center plane. The first arm and second arm are spaced apart such that they create an asymmetric configuration that reduces the projection distance of the rear derailleur from the axial center plane while maintaining adequate adjustment range through the spacing between arms
Solution Approach 2:
By arranging arms in the axial direction rather than radially, the patent utilizes the axial dimension to reduce projection distance. The spacing between arms in the axial direction allows the rear derailleur to be positioned closer to the axial center plane while still providing sufficient adjustment capability
3Strength
If the bracket device uses more materials to increase rigidity, then the strength improves, but the weight increases
Solution Approach 1:
The bracket device uses multiple arms spaced apart in the axial direction, creating a segmented structure that achieves high rigidity through geometric distribution rather than material quantity. This segmentation allows the use of thinner, lighter materials while maintaining structural strength through the spaced arrangement
Solution Approach 2:
The patent transitions from a radial arm arrangement to an axial arrangement, utilizing the axial dimension to achieve rigidity. This dimensional change allows for reduced material usage because the spacing between arms in the axial direction creates structural stiffness without requiring thick or heavy materials
Data Source
AI summary
A bracket device is configured to mount a bicycle rear derailleur on a rear-wheel axis of a bicycle. The bracket device includes a frame attachment end for coupling to a bicycle frame and a derailleur attachment end for coupling to the bicycle rear derailleur. The frame attachment end has a first arm and a second arm, which are spaced apart in an axial direction with respect to the rear-wheel axis. The first arm has a first attachment opening through which the rear-wheel axis coaxially passes in a mounting state of the bracket device. The second arm has a second attachment opening through which the rear-wheel axis coaxially passes in the mounting state of the bracket device. The derailleur attachment end has a third attachment opening configured to receive a derailleur fastener for coupling to the base element of the bicycle rear derailleur.