Motor Inner Ring Tilt via Non-Uniform Bias Spring
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Solution Overview
Problem
Conventional motors using ball bearings face noise and vibration issues due to sliding contact between the inner ring and rotary shaft, which are not adequately suppressed by existing methods.
Innovation Solution
A motor design incorporating a pressurizing spring washer that applies different bias forces to the inner ring, causing it to tilt and maintain stable contact with the rotary shaft, thereby eliminating sliding contact and reducing noise and vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional washer is used to apply uniform bias force to the inner ring, then the bearing structure is simple, but sliding contact occurs between the inner ring and rotary shaft causing noise and vibration
Solution Approach 1:
The pressurizing spring washer applies bias force non-uniformly to specific localized areas of the inner ring rather than uniformly across the entire surface. This localized pressurization causes the inner ring to tilt and form stable contact points with the rotary shaft, eliminating sliding contact and the associated noise and vibration while maintaining structural simplicity
Solution Approach 2:
The invention changes the distribution pattern of the bias force parameter from uniform to non-uniform. By controlling the pressurizing spring washer to apply different magnitudes of force to different areas of the inner ring, the system transforms the contact mechanics between the inner ring and rotary shaft, converting sliding contact to stable point contact and thereby reducing noise and vibration
2Stability of the object's composition
If uniform bias force is applied to the inner ring, then the washer design is simple, but the positional relation between inner ring and rotary shaft is unstable
Solution Approach 1:
The pressurizing spring washer is designed with non-uniform pressurization characteristics, applying different bias forces to different localized areas of the inner ring. This localized differential pressurization creates stable contact points that fix the positional relation between the inner ring and rotary shaft, preventing instability while keeping the washer design relatively simple
Solution Approach 2:
The pressurizing spring washer acts as an intermediary element between the bearing structure and the rotary shaft. By controlling the bias force distribution through this intermediary component, the system achieves stable positional relations without requiring complex modifications to either the bearing or shaft structures
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
The solution effectively reduces noise and vibration by stabilizing the positional relation between the inner ring and rotary shaft, suppressing backlashes and extending the bearing's lifetime.
Implementation Method 1
the pressurizing spring applies different bias forces to the inner ring, causing it to tilt and maintain stable contact with the rotary shaft
Data Source
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AI summary
A motor according to the present invention includes bearing (11) which includes: inner ring (11a) having upper end surface (11d), outer ring (11b), and balls (11c) between inner ring (11a) and outer ring (11b). Pressurizing spring (12) is inserted onto rotary shaft (3), is located between core (4) and bearing (11), and provides bias forces in the axial direction of rotary shaft (3). Outer ring (11b) is pressed to fit into bearing holding part (9a). Inner ring (11a) is fitted onto rotary shaft (3) with gap (15) therebetween. Upper end surface (11d) of inner ring (11a) is in contact with pressurizing spring (12). Pressurizing spring (12) applies the bias forces of different strengths onto a surface in which upper end surface (11d) contacts with pressurizing spring (12), along a circumferential direction with the axial direction as a center.