Internal Hub Brake Disc for Bicycle Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Bicycle brake disc units are prone to bending from external shocks, causing potential injury and steering instability due to their exposed and offset position.
Innovation Solution
A hub unit design with a brake disc fixed internally within the hub body, utilizing a brake shoe and piston member with elastic members to absorb shocks and maintain disc centrality, and a hydraulic pressure system for effective braking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the brake disc is exposed and disposed on the outside of the hub body, then the braking function is accessible, but the disc becomes bent by external shock or force and causes injury risk
Solution Approach 1:
The brake disc is nested within the hub body structure, specifically disposed in a recessed portion of the hub body. This nesting arrangement protects the brake disc from external shocks and forces while maintaining its functional accessibility for braking operations.
Solution Approach 2:
The hub body acts as an intermediary structure between the external environment and the brake disc. By positioning the brake disc within the hub body's recessed portion, the hub body shields the disc from direct external impacts that could cause bending or injury.
2Device complexity
If the brake disc is offset to one side of the hub body, then the braking mechanism is simplified, but a moment is generated in one direction during braking causing steering instability
Solution Approach 1:
The invention uses symmetric arrangement of brake discs on both sides of the hub body, creating balanced moments that cancel each other out during braking. This symmetric configuration eliminates the unidirectional moment that would cause steering instability.
Solution Approach 2:
The brake disc on one side of the hub body acts as a counterweight to the brake disc on the other side. During braking, the moments generated by each disc counterbalance each other, preventing steering instability while maintaining braking effectiveness.
3Ease of operation
If the brake disc is exposed on the outside of the hub body, then the brake pad can easily contact the disc, but the sharp disc edge can cause injury to a person
Solution Approach 1:
The brake disc is nested within the hub body's recessed portion, which conceals the sharp edges of the disc while maintaining the functional interface between the brake pad and disc. This nesting protects users from injury while preserving braking efficiency.
Solution Approach 2:
The hub body's recessed portion serves as an intermediary structure that houses the brake disc. This intermediate structure provides protection against the sharp edges of the disc while allowing the brake pad to maintain effective contact with the disc surface for braking.
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
Prevents disc bending, eliminates injury risks, and stabilizes steering by center-mounting the brake disc, ensuring consistent braking performance.
Implementation Method 1
An elastic member is disposed in or on the fixed shaft and supplies elastic force to an axial outward side or external side of the brake shoe
Implementation Method 2
a brake pad is disposed to come in contact with the brake disc. A braking force applier for supplying a braking force to the hub body wherein the brake pad and the brake disc are in contact with each other
Data Source
AI summary
A hub unit has a brake disc and a hub body disposed to rotate with a rim on which a tire is mounted. An internal space is formed in the hub body, wherein the brake disc is fixed in the internal space. A fixed shaft is disposed and fixed along a rotation center shaft of the hub body. A brake shoe is coupled to the fixed shaft. A brake pad is disposed to contact the brake disc. A braking force applier supplies a braking force to the hub body wherein the brake pad and the brake disc are in contact with each other.