Motor Bearing Coupling via Sintering Member
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Solution Overview
Problem
The coupling between the rotation shaft and the upper bearing in electric power-assist steering systems can disintegrate due to excessive pressure from the output clutch, leading to inaccurate rotation and potential noise and vibration issues.
Innovation Solution
A motor design that incorporates a sintering member with lugs symmetrically arranged about the output clutch, which contacts the inner race of the upper bearing, preventing axial movement of the rotation shaft and maintaining contact to minimize slip and ensure stable rotational operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the output clutch receives continuous pressing force during repetitive steering operations, then the coupling between the rotation shaft and the upper bearing becomes disintegrated, but the motor can still transmit power to the steering shaft
Solution Approach 1:
A sintering member is introduced as an intermediary component between the output clutch and the rotation shaft. This sintering member has a clutch coupling portion that couples to the output clutch and a shaft coupling portion that couples to the rotation shaft, distributing the pressing force and preventing direct disintegration of the rotation shaft-bearing coupling while maintaining power transmission functionality
2Power
If the coupling force between the rotation shaft and the output clutch is greater than the coupling force between the rotation shaft and the upper bearing, then the output clutch can transmit power effectively, but the coupling between the rotation shaft and the upper bearing becomes vulnerable to disintegration
Solution Approach 1:
The coupling system is segmented into multiple coupling interfaces: output clutch-sintering member coupling and sintering member-rotation shaft coupling. This segmentation distributes the high coupling force across multiple interfaces, preventing concentration of stress at any single point and protecting the vulnerable rotation shaft-bearing interface while maintaining effective power transmission
Data Source
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AI summary
A motor is provided, the motor including a motor housing (10), a stator (20) fixedly coupled to the motor housing (10), a rotor (30) rotatably installed at a center of the stator (20) by a rotation shaft (30a), upper and bottom bearings having an outer race (42) fixed to the motor housing (10) and an inner race (41) coupled to the rotation shaft (30a), and an output clutch (100) contacting an inner race (41) of the upper bearing (40).