Bicycle Derailleur Inner Wire Guide Bush Replacement
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Solution Overview
Problem
Existing bicycle derailleurs with inner wire guides face difficulties in exchanging the metal bush when it becomes worn out, as it is fixed in the through bore and not easily replaceable.
Innovation Solution
A bicycle derailleur design featuring a base member with an inner wire guide that includes an inlet and outlet portion, where the attachment member is detachably and rotatably attached to the outlet portion, allowing for easy replacement of the metal bush, using a fastener like a set screw for securement within a threaded bore.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the metal bush is fixed in the through bore of the inner cable guide by a swaging process, then the metal bush is securely held in place, but it becomes difficult to exchange the metal bush when worn out
Solution Approach 1:
The inner cable guide is divided into a body portion and a separate attachment member (metal bush) that can be independently replaced. The attachment member is detachably attached to the body portion, allowing the metal bush to be exchanged without replacing the entire inner cable guide assembly.
Solution Approach 2:
The attachment member is rotatably disposed in the through bore, transitioning from a static fixed position to a dynamic rotatable position. This rotational capability allows the metal bush to be easily removed and replaced by rotating it out of the bore, while still providing securement during operation.
2Device complexity
If the metal bush is fixed in the through bore, then the inner wire guide structure is simplified, but replacement of the metal bush requires damaging the inner wire guide
Solution Approach 1:
The inner cable guide is segmented into a body portion and a separate attachment member. This segmentation allows the attachment member to be independently manufactured and replaced without affecting the body portion, eliminating the need to damage the inner wire guide during replacement.
Solution Approach 2:
The attachment member is pre-configured with features (such as an annular groove or threaded bore) that enable easy attachment and detachment. This preliminary design allows for tool-free or simple tool-based replacement without requiring damage to the inner wire guide structure.
3Ease of repair
If the attachment member is rotatably disposed in the through bore, then the metal bush can be easily replaced, but additional structural features are required
Solution Approach 1:
The inner cable guide is divided into a body portion and a separate attachment member. This segmentation allows the attachment member to be independently replaced without affecting the body portion, eliminating the need to damage the inner wire guide during replacement.
Solution Approach 2:
The attachment member is pre-configured with features (such as an annular groove or threaded bore) that enable easy attachment and detachment. This preliminary design allows for tool-free or simple tool-based replacement without requiring damage to the inner wire guide structure.
Data Source
AI summary
A bicycle derailleur is basically provided with a base member, a movable member, a coupling structure and an attachment member. The base member is configured to be mounted to a bicycle. The base member has an inner wire guide. The inner wire guide has an inlet portion and an outlet portion. The movable member supports a chain guide. The coupling structure movably couples the movable member to the base member so that the movable member is selectively movable relative to the base member. The attachment member is detachably and/or rotatably attached to the outlet portion of the inner wire guide.