Bicycle Stem Internal Cable Routing and Friction Reduction
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Solution Overview
Problem
Current bicycle designs often suffer from cable entanglement and friction issues, which lead to reduced service life of braking and shifting mechanisms due to exposed cables that can rupture and cause mechanical failures.
Innovation Solution
A bicycle stem structure with a housing and vertical pipe design that separates and routes cables internally, using through holes and annular cavities to prevent entanglement and reduce friction, while also incorporating features like limiting grooves and protrusions to prevent cable bending and secure connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cables are exposed during bicycle operation, then cable routing is simple and accessible, but cables become entangled during handlebar rotation and friction with outer structures causes sheath rupture
Solution Approach 1:
The patent embeds cables within the hollow stem structure, routing them through the internal cavity of the stem rather than exposing them externally. The stem acts as a protective housing that contains the cables, allowing them to pass through the hollow interior from the handlebar side to the brake lever side without contacting external surfaces that could cause friction or entanglement.
Solution Approach 2:
The patent introduces guide structures and protective channels within the stem cavity to mediate cable movement. These intermediary elements guide cables through the hollow stem, preventing direct contact with rotating handlebar surfaces and reducing friction points that would otherwise lead to sheath rupture.
2Ease of manufacture
If multiple cables are routed externally for easy access, then installation and maintenance are simplified, but cables entangle during handlebar rotation affecting use
Solution Approach 1:
The patent nests cables within the hollow stem, using the stem's internal cavity as a protective corridor. This nesting approach allows cables to be routed through the stem's hollow interior, preventing entanglement during handlebar rotation while maintaining accessible entry and exit points for installation and maintenance.
Solution Approach 2:
The patent transitions cable routing from a two-dimensional external path to a three-dimensional internal pathway through the hollow stem. By utilizing the vertical and radial dimensions of the hollow stem cavity, cables are routed through the interior space, avoiding entanglement with external handlebar components during rotation.
3Device complexity
If cables are exposed for straightforward routing, then structural complexity is reduced, but friction with outer structures causes sheath rupture
Solution Approach 1:
The patent utilizes the hollow stem structure as a nested protective housing for cables. The stem's hollow cavity serves as an integrated protective channel, eliminating the need for separate external cable guards while preventing friction with outer structures that would cause sheath rupture.
Solution Approach 2:
The patent merges the stem structure with the cable routing function by utilizing the hollow stem cavity as both a structural support element and a protective cable conduit. This consolidation integrates cable protection into the stem itself, reducing overall structural complexity while enhancing reliability.
Data Source
AI summary
The bicycle stem structure includes a mounting seat, a housing, and a vertical pipe. The housing includes a first connecting member extending toward a front wheel and a second connecting member extending toward a rear wheel. The vertical pipe is located in the first through hole. The vertical pipe is spaced apart from an inner wall of the first through hole and forms an annular cavity in communication with the second through hole. The vertical pipe is provided with a third through hole along an axial direction thereof. The mounting seat is connected to the vertical pipe and provided with at least two cable through holes through which cables are passed. At least one cable through hole is in communication with the third through hole, and at least one cable through hole is in communication with the annular cavity.