Bicycle Rear Derailleur Intermediate Member Secure Mounting
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Solution Overview
Problem
Existing bicycle rear derailleurs face challenges in securely mounting the intermediate member without additional placement members, leading to increased manufacturing costs and potential misalignment issues.
Innovation Solution
The design incorporates a base member with a fastening member featuring a threaded portion and a placement portion with a smaller inner diameter, preventing accidental removal of the intermediate member by ensuring it is securely disposed on the placement portion, which includes a non-threaded section and a tool engagement portion for improved installation efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an additional placement member is used to secure the intermediate member, then the intermediate member can be securely mounted, but manufacturing costs increase
Solution Approach 1:
The patent merges the placement member function into the fastening member by integrating a placement portion directly onto the fastening member body. This eliminates the need for a separate placement member while maintaining the secure mounting function, thereby reducing part count and manufacturing cost while achieving reliable intermediate member retention
Solution Approach 2:
The fastening member is designed to perform multiple functions: it provides both the placement function (through the placement portion with smaller inner diameter) and the fastening function (through the threaded portion). This multi-functionality eliminates the need for additional dedicated placement members, reducing manufacturing complexity and cost while ensuring reliable mounting
2Ease of operation
If the intermediate member can be easily removed, then installation and maintenance are simpler, but security and stability are compromised
Solution Approach 1:
The fastening member features local quality variation through its dual-structure design: the placement portion has a smaller inner diameter for secure retention, while the threaded portion has a larger outer diameter for engagement. This localized structural differentiation provides both security during normal operation and controlled accessibility when removal is needed with appropriate tools
Solution Approach 2:
The placement portion acts as an intermediary structure between the fastening member and the intermediate member. Its smaller inner diameter creates a interference fit that secures the intermediate member during operation, while still allowing controlled removal when necessary, thus mediating between security and ease of operation
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively prevents the intermediate member from being removed without additional placement members, reducing manufacturing costs and ensuring secure mounting, thereby enhancing the installation efficiency and maintaining the rotational orientation of the derailleur.
Implementation Method 1
The intermediate member has a second threaded portion configured to threadedly engage with the first threaded portion of the fastening member
Data Source
AI summary
A bicycle rear derailleur is basically provided with a base member including a frame mounting portion having a mounting opening, and a fastening member extending through the mounting opening of the base member. The fastening member has a first threaded portion and a placement portion adjacent to the first threaded portion. An adjusting member is configured to adjust a position of the bicycle rear derailleur relative to a bicycle. An intermediate member includes a contact portion disposed between the adjusting member and the bicycle. The intermediate member has a second threaded portion configured to threadedly engage with the first threaded portion of the fastening member. The second threaded portion has an innermost diameter that is smaller than the outermost diameter of the first threaded portion. The intermediate member is disposed on the placement portion of the fastening member.