Bicycle Component Mounting Structure for Rattle Elimination
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Solution Overview
Problem
Existing bicycle drive units with motor components experience rattling due to manufacturing tolerances creating gaps between side plates and mounting portions, leading to instability during travel.
Innovation Solution
A bicycle component with a housing that supports the crankshaft, featuring a first mounting portion with a male thread to press the housing and a second member with a female thread to press the frame, ensuring a stable mounting by applying force to move the housing and frame apart, thereby eliminating gaps and rattling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bolts are used to fasten the mounting portion between side plates, then the motor unit can be mounted to the bracket, but gaps form due to manufacturing tolerances causing rattling
Solution Approach 1:
The mounting portion is designed with a pressing mechanism that applies force to eliminate gaps between the mounting portion and side plates before the bicycle is put into service. This preliminary action of pressing removes the harmful gaps caused by manufacturing tolerances, preventing rattling noise from occurring during operation.
2Reliability
If the housing and frame are pressed together tightly, then gaps are eliminated and rattling is prevented, but the mounting structure becomes more complex
Solution Approach 1:
The mounting portion is designed to perform multiple functions: it serves as both the mounting interface and the pressing mechanism. The same mounting portion that attaches the housing to the frame also applies the necessary pressing force through its structural design, eliminating the need for separate pressing components and reducing overall structural complexity.
Data Source
AI summary
A bicycle component includes a housing that supports a crankshaft of a bicycle and a first mounting portion that mounts the housing on a frame of the bicycle. The first mounting portion is configured to apply force to the housing and the frame that moves the housing and the frame away from each other.