Motor Mount Flange Axial Lateral Alignment Power Tool
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Solution Overview
Problem
Existing power tool motor mounts fail to ensure consistent axial and lateral alignment between the motor and gear box, leading to side loading and potential mechanical failure due to improper alignment.
Innovation Solution
A motor mounting system comprising a motor mount with a flange and radially-extending arms that couples to the motor and gear case, using shoulder pins and a bearing to secure the motor and gear case axially and laterally, preventing misalignment and side loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional motor mount is used to connect the motor to the gear box, then the motor can be mounted, but axial and lateral alignment between the motor and gear box cannot be guaranteed, leading to side loading and potential mechanical failure
Solution Approach 1:
The motor mount is divided into multiple functional segments: a first portion that axially locates the motor, a second portion that laterally locates the motor, and a third portion that axially locates the gear box. This segmentation allows each portion to independently control specific alignment parameters, ensuring precise axial and lateral alignment while maintaining structural simplicity.
2Reliability
If the motor mount does not provide precise axial location, then the structure can be simpler, but side loading of the motor shaft and bearing occurs, causing excessive current draw and mechanical failure
Solution Approach 1:
The motor mount incorporates a shouldered pin with a shoulder that preliminarily establishes the axial position of the motor shaft before final assembly. This preliminary action ensures proper axial location is achieved during assembly, preventing side loading and bearing misalignment while maintaining ease of manufacture through simple shouldered pin geometry.
3Reliability
If the motor mount does not provide lateral location, then the structure can be simpler, but the motor becomes misaligned with the gear box, causing high current draw or other failures
Solution Approach 1:
The motor mount acts as an intermediary component between the motor and gear box, with its second portion specifically designed to laterally locate the motor. This intermediary structure provides the necessary lateral positioning to ensure proper motor-gear box alignment without requiring complex integration into either the motor or gear box themselves.
Data Source
AI summary
A power tool includes a motor having a can and a shaft extending axially from the can, a gear case having an inner surface that defines an opening, a bearing positioned around a portion of the shaft that extends from the can and at least partially within the opening in the gear case, and a motor mount coupled to the motor. The motor mount includes a flange extending away from the motor. The flange of the motor mount and the inner surface of the gear case axially and laterally locate the motor and the gear case on the bearing.