Vehicle Wheel Bearing Pilot Geometry for Knuckle Assembly
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Solution Overview
Problem
Existing bearing devices for vehicle wheels face issues with assemblability to the knuckle due to a small fitting gap, which can lead to gouging and impaired assembly, and current solutions that enhance bearing rigidity increase costs.
Innovation Solution
A bearing device with a pilot portion featuring a guide portion that gradually decreases in diameter from the inner-side end toward the inner side, including tapered surfaces and a chamfered portion, which guides the knuckle's opening portion onto the fitting portion, improving insertability without the need for a cover with rust prevention properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cover with rust prevention function is used to reduce fitting gap, then bearing rigidity is enhanced, but manufacturing cost increases
Solution Approach 1:
The invention extracts and eliminates the cover component from the bearing assembly, achieving rust prevention and fitting gap reduction through the guide portion's geometric design alone, thereby reducing manufacturing cost while maintaining bearing rigidity
Solution Approach 2:
The invention changes the geometric parameters of the pilot portion by introducing a guide portion with specific taper angle and dimensions, transforming the fitting interface to achieve both rust prevention and reduced fitting gap without additional components
2Strength
If fitting gap between pilot portion and knuckle is reduced to enhance bearing rigidity, then bearing rigidity is improved, but gouging occurs and assemblability deteriorates
Solution Approach 1:
The guide portion performs preliminary action by guiding the knuckle opening portion onto the fitting portion before final engagement, preventing gouging and ensuring proper alignment even with reduced fitting gap
Solution Approach 2:
The guide portion employs a tapered curved surface geometry that gradually guides the fitting components together, distributing contact stress and preventing gouging while maintaining reduced fitting gap for enhanced rigidity
Data Source
AI summary
Provided is a bearing device for a vehicle wheel that is suitable in being able to prevent impairment in assemblability of the bearing device for a vehicle wheel to a knuckle without cost increase. A bearing device for a vehicle wheel (1) is provided with an inner member and an outer ring (2) which is an outer member having a vehicle-body-mounting flange part (2d), wherein the outer ring (2) has a pilot part (2e) disposed inward of the vehicle-body-mounting flange part (2d), and the pilot part (2e) has a fitting portion (2f) configured to be fitted to a knuckle (10) and a guiding portion (2g) having a diameter which gradually decreases inward from the inner-side end of the fitting portion (2f).