Bicycle Operating Base Member Structure for Bore Deformation Control
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Solution Overview
Problem
Bicycle operating devices made of resin materials face deformation issues during manufacturing, affecting the inner peripheral surfaces of cylinder bores, which compromises their structural integrity and functionality.
Innovation Solution
Incorporating recesses and ribs on the outer surfaces of the base member, strategically positioned to reduce deformation and maintain strength, along with a reservoir bore connected to the cylinder bore, enhances the manufacturing process and structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the base member is made of resin material, then manufacturing cost and weight are reduced, but deformation of the inner peripheral surface of the cylinder bore occurs during manufacturing
Solution Approach 1:
The patent applies local quality by providing recesses at specific locations on the outer peripheral surface of the base member, particularly at positions where deformation is most likely to occur during manufacturing. These localized structural modifications allow the resin material to maintain overall strength while preventing deformation of the cylinder bore's inner peripheral surface during the manufacturing process.
2Manufacturing precision
If recesses are added to the base member to reduce deformation, then manufacturing precision improves, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the base member's outer peripheral surface into multiple regions and providing recesses at specific segmented locations. Rather than modifying the entire surface uniformly, recesses are strategically placed at positions where deformation is most likely to occur, such as around the cylinder bore area. This segmented approach effectively reduces deformation while minimizing the overall increase in device complexity.
3Strength
If the base member structure is simplified, then device complexity is reduced, but strength of the base member decreases
Solution Approach 1:
The patent maintains base member strength by applying local quality enhancements through strategically positioned recesses. These recesses are located at critical areas where deformation resistance is most needed, such as around the cylinder bore, rather than uniformly across the entire base member. This allows the structure to maintain adequate strength with minimal additional complexity.
Data Source
AI summary
A bicycle operating device comprises a base member made of a resin material. The base member includes an outer surface, a cylinder bore, and at least one recess. The outer surface includes a first surface, a second surface, a third surface, a fourth surface, a fifth surface, and a sixth surface. The cylinder bore has a cylinder center axis. The cylinder bore is provided between the first surface and the second surface and between the third surface and the fourth surface as viewed along the cylinder center axis. The at least one recess defines a cylinder wall between the cylinder bore and the at least one recess. The at least one recess is provided on at least two of the first surface, the second surface, the third surface, the fourth surface, the fifth surface, and the sixth surface.