Bearing Retaining Structure That Protects Rolling Surface Geometry
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Solution Overview
Problem
Conventional gear devices experience a reduction in circularity or cylindricity of the rolling surface when the restriction member is fastened, leading to potential breakage of the rolling surface.
Innovation Solution
A bearing retaining mechanism that includes a first member with an internal screw portion, a second member with a rolling surface, and a restriction member with an external screw portion, where the second member is positioned to create a gap between itself and the restriction member, distributing the fastening pressure to the first member, thereby reducing the pressure on the rolling surface and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the restriction member is fastened to the carrier to restrict crankshaft movement, then the crankshaft axial movement is restricted, but the fastening torque causes reduction in circularity or cylindricity of the rolling surface
Solution Approach 1:
A buffer member is introduced as an intermediary component between the restriction member and the carrier. This buffer member absorbs the fastening torque and prevents direct transmission of clamping force to the rolling surface, thereby maintaining the circularity and cylindricity of the rolling surface while still restricting crankshaft axial movement through the restriction member.
Solution Approach 2:
The carrier is divided into multiple segments or sections, with the rolling surface area separated from the fastening area. This segmentation allows the fastening torque to be applied to one part of the carrier without directly affecting the rolling surface geometry, thus preventing deformation while maintaining axial movement restriction.
2Reliability
If the restriction member is fastened tightly to ensure stability, then the crankshaft positioning is improved, but the rolling surface may be broken due to reduced circularity or cylindricity
Solution Approach 1:
The buffer member serves as a protective intermediary that decouples the fastening force from the rolling surface. This allows the restriction member to be fastened tightly for stable crankshaft positioning while the buffer member protects the rolling surface from deformation and potential breakage.
Solution Approach 2:
The buffer member provides beforehand cushioning by absorbing and distributing the fastening torque before it can reach the rolling surface. This pre-cushioning effect prevents the rolling surface from experiencing excessive stress that could lead to deformation or breakage, ensuring both positioning stability and surface integrity.
Data Source
AI summary
One object is to reduce an effect of fastening of a restriction member, thereby to increase durability of a bearing retaining mechanism. The present invention relates to a bearing retaining mechanism. A bearing retaining mechanism according to an embodiment includes: a first member having an inner peripheral surface including an internal screw portion; a second member disposed on the inner peripheral surface; a rolling member configured to roll on a rolling surface formed on the second member; a crankshaft rotatably supported on the second member via the rolling member; and a restriction member supported on the first member and the second member, the restriction member including an external screw portion screwed on the internal screw portion of the first member.