Bicycle Control Mount Structure for Higher Rigidity in Tight Space
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Solution Overview
Problem
Human-powered vehicle operating devices lack sufficient rigidity and efficient space utilization, leading to reduced performance under applied forces.
Innovation Solution
The operating device features a base member with a mounting part that includes multiple contact surfaces and a cylinder bore, along with an intermediate hole, to distribute and absorb forces effectively, enhancing rigidity and allowing for efficient space use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single contact surface is used in the mounting part, then the structure is simpler, but the rigidity of the operating device is insufficient
Solution Approach 1:
The mounting part is divided into multiple contact surfaces (first contact surface, second contact surface, and mounting contact surface) that are spaced apart in the axial direction. This segmentation allows forces applied to the operating member to be distributed across multiple contact points with the tubular part, thereby improving rigidity and reducing the influence of applied forces on the operating device's stability.
2Strength
If the base member structure is expanded to improve rigidity, then the rigidity increases, but the space utilization around the operating device decreases
Solution Approach 1:
The multiple contact surfaces are arranged in the axial direction (along the opening center axis), utilizing the axial dimension rather than expanding radially or laterally. This allows the operating device to achieve improved rigidity through axial distribution of contact surfaces without encroaching on the lateral space around the device, thus maintaining efficient space utilization.
3Strength
If multiple contact surfaces are added to improve rigidity, then the rigidity improves, but the manufacturing complexity increases
Solution Approach 1:
The first contact surface, second contact surface, and mounting contact surface are all integrally formed as part of the same mounting part structure. This merging of multiple contact surfaces into a single integrated component simplifies manufacturing compared to assembling multiple separate parts, while still achieving the rigidity improvement through the distributed contact surface configuration.
Data Source
AI summary
An operating device comprises a base member and an operating member. The base member includes a base body and a mounting part. The mounting part includes a mounting contact surface contactable with a tubular part of the human-powered vehicle in a mounting state where the mounting part couples the base body to the tubular part of the human-powered vehicle. The base member includes a first contact surface and a second contact surface. The first contact surface is contactable with the tubular part of the human-powered vehicle in the mounting state. The first contact surface is spaced apart from the mounting contact surface in an axial direction. The second contact surface is contactable with the tubular part of the human-powered vehicle in the mounting state. The second contact surface is spaced apart from the mounting contact surface and the first contact surface in the axial direction.