Vehicle Wheel Bearing Cap Member Tapered Fitting Section
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Solution Overview
Problem
Conventional vehicle wheel bearing devices face issues with muddy water ingress, leading to premature wear and assembly challenges due to interference between the cap member's fitting section and the vehicle body-side member's fitting hole section, which affects the assembling property of automobiles.
Innovation Solution
The bearing device features a cap member with a large-diameter section on the outer side and a small-diameter section on the inner side of the fitting cylinder, formed by bending a metal steel plate, and includes a tapered portion based on the spring back angle to prevent interference with the inner peripheral edge of the fitting hole section, ensuring smooth assembly and supporting an encoder and sensor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the fitting section of the cap member is opened radially outward due to spring back, then the cap member can be fitted over the fitting cylinder section, but the fitting section may interfere with the inner peripheral edge of the fitting hole section and cannot be fitted smoothly
Solution Approach 1:
The tapered portion is pre-formed on the fitting section at an angle equal to or greater than the spring back angle, anticipating the radial outward opening that occurs during fitting. This preliminary geometric compensation ensures that when spring back occurs, the fitting section maintains proper alignment and does not interfere with the inner peripheral edge of the fitting hole section, enabling smooth assembly.
Solution Approach 2:
The fitting section is designed with a specific tapered angle parameter that is equal to or greater than the spring back angle. By changing the geometric parameter (tapered angle) of the fitting section, the design compensates for the spring back effect, allowing the cap member to be fitted smoothly over the fitting cylinder section without interference with the fitting hole section's inner peripheral edge.
2Ease of manufacture
If the cap member is formed by bending a metal steel plate, then the cap member can be manufactured with the required shape, but the fitting section may open radially outward due to spring back
Solution Approach 1:
The tapered portion is pre-formed on the fitting section during the bending process, anticipating the spring back that will occur afterward. This preliminary geometric compensation ensures that even though spring back causes the fitting section to open radially outward, the tapered geometry maintains proper fit and prevents interference with the fitting hole section.
Solution Approach 2:
The design incorporates a tapered angle parameter on the fitting section that is equal to or greater than the expected spring back angle. By adjusting this geometric parameter during design, the patent compensates for the shape instability caused by spring back, allowing the bent metal steel plate to maintain its functional geometry after manufacturing.
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
This design enhances the assembling property of automobiles by preventing cap member interference and maintaining the integrity of the cap member's structure, ensuring reliable fitment and preventing cap member fall-off, while supporting sensors without distorting the cover plate.
Implementation Method 1
the cap member is formed by bending a metal steel plate, to have a cover plate section that closes an inner open end of the outer member and have a fitting section that is fitted over a small-diameter section, and to be provided with a tapered portion based on a spring back angle of the fitting section, on an outer peripheral edge at an outer end section of the fitting section
Data Source
AI summary
In a bearing device for a vehicle wheel (1), a large-diameter section (2i) is formed on an outer side of a fitting cylinder section (2h), and a small-diameter section (2j) is formed on an inner side of the fitting cylinder section (2h). A cap member (8) is formed by bending a metal steel plate, and has a cover plate section (81) which closes the inner open end of an outer member (2) and a fitting section (82) which is fitted over the small-diameter section (2j). A tapered portion (83) based on the spring back angle θ of the fitting section (82) is provided at the outer peripheral edge of the outer end section of the fitting section (82).