Bicycle Stem Cable Routing to Prevent Steering Interference
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Solution Overview
Problem
Conventional bicycle frames with hollow tubular structures cause corrosion and vibration issues for cables, leading to reduced service life and safety concerns due to interference during steering.
Innovation Solution
A cable routing system featuring a stem with clamping members, a spacer, and a fork design that secures inner cables, preventing interference and oversteering by using an expander with cable passages and strategically positioned holes to maintain cable integrity and reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cables are disposed as inner cables by being passed through the bicycle frame via holes, then corrosion resistance is improved, but cable fixation firmness deteriorates and vibration noise increases
Solution Approach 1:
The patent applies local quality by creating a dedicated cable receiving space within the stem with specific local characteristics (smooth inner surface, appropriate dimensions) that provide firm cable fixation. This localized solution addresses the fixation issue without affecting the overall inner cable routing design, maintaining both corrosion resistance and fixation firmness.
2Shape
If inner cables are passed through the bicycle frame, then appearance is improved, but cable interference during steering occurs
Solution Approach 1:
The patent extracts the cable routing function from the traditional frame hole approach and relocates it to a dedicated receiving space within the stem. This separation removes the harmful interference effect while preserving the aesthetic benefits of inner cable routing, as cables are contained within the stem structure rather than running along the frame exterior.
Solution Approach 2:
The stem acts as an intermediary structure that houses the cable receiving space, mediating between the frame and handlebar while providing a controlled environment for cable routing. This intermediary solution allows cables to be routed internally without direct contact with moving steering components, eliminating interference while maintaining appearance.
3Reliability
If cables are routed through the frame, then cable protection is improved, but friction during steering increases causing safety issues
Solution Approach 1:
The patent applies beforehand cushioning by providing a pre-designed receiving space with smooth inner surfaces before cables undergo steering movements. This pre-prepared protective environment reduces friction from the outset, preventing cable damage and safety issues while maintaining the protective benefits of inner cable routing.
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
The system extends the service life of inner cables, enhances safety, and improves steering stability by securely routing cables and preventing friction-induced damage.
Implementation Method 1
an end of the fixing bolt is screwed with the expander, so that the expander expands to be tightly fixed in the steering tube
Implementation Method 2
the first clamping member and the second clamping member are adapted to be engaged with each other to clamp the handlebar
Data Source
AI summary
A cable routing system of a bicycle, including a stem having a receiving space and an engaging hole communicating with the receiving space, a frame, a fork, an expander, and at least one cable. A head tube of the frame has a top portion having an upper mounting hole and a bottom portion having a lower mounting hole. The fork sequentially passes through the lower mounting hole, the upper mounting hole, and the engaging hole to be connected to the stem. The expander is disposed in a steering tube of the fork and has at least one cable passage communicating with the receiving space and the engaging hole. The cable extends into the steering tube from outside by passing through the receiving space and the cable passage. An end of the cable is connected to a bicycle controller, and another end thereof is connected to a bicycle component.