Geared Motor Restriction Portion Radial Stress
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Solution Overview
Problem
Existing geared motors transmit radial stress from the input member to the support shaft through the speed reduction-output member and restriction portion, potentially damaging the support shaft.
Innovation Solution
The geared motor design includes a restriction portion located between the outer circumferential surface of the support shaft and the inner circumferential surface of the accommodation recess, positioned differently from where the speed reduction-output member abuts against the input member, to absorb and redirect radial stress, reducing transmission to the support shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the restriction portion is positioned at the abutment location between the speed reduction-output member and input member, then the radial stress is effectively transmitted to the support shaft, but the support shaft may be damaged due to excessive stress concentration
Solution Approach 1:
The restriction portion is positioned in the axial direction at a location different from the radial abutment position, utilizing the axial dimension to redistribute stress paths and avoid concentration at the critical radial interface between the speed reduction-output member and support shaft
Solution Approach 2:
The restriction portion acts as an intermediary element that intercepts and redirects radial stress away from the support shaft, preventing direct stress transmission through the abutment interface
Data Source
AI summary
A geared motor includes a motor and a reduction drive. The reduction drive includes a gear housing, a speed reduction-output member, and a restriction portion. The gear housing includes a support shaft. The speed reduction-output member includes a reduction gear, an output gear meshed with an input member, and an accommodation recess. The speed reduction-output member is rotationally supported by the support shaft. The restriction portion is configured to restrict movement of the speed reduction-output member relative to the support shaft. The restriction portion is located between an outer circumferential surface of the support shaft and an inner circumferential surface of the accommodation recess. The restriction portion is located in an axial direction of the support shaft at a position that differs from a portion where the speed reduction-output member abuts in a radial direction against the input member.