Impact Tool Housing Assembly for Shorter Front-End Fixation
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Solution Overview
Problem
Conventional power tools experience an increase in total length due to screws used for fixing the housings, which are arranged between the motor and the rotation mechanism.
Innovation Solution
The power tool design fixes the motor housing and rotation mechanism case together using a screw member that reaches from the rear side, eliminating the need for a left-right space for screws and reducing the overall length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are arranged between the motor and rotation mechanism to fix the housings, then the housing fixation is achieved, but the total length of the power tool increases
Solution Approach 1:
The screw member is configured to reach the rotation mechanism case from the rear side of the motor housing, changing the fixing direction from the conventional left-right direction to the front-rear direction. This dimensional change allows the screw to pass through the motor housing and fix both housings without requiring additional left-right space, thereby reducing the total length of the power tool while maintaining reliable housing fixation
2Reliability
If multiple screws are used to fix the motor and housings, then the fixation reliability is improved, but the number of parts and weight increase
Solution Approach 1:
The screw member is designed to perform multiple functions simultaneously: it fixes the motor to the motor housing, fixes the motor housing to the rotation mechanism case, and secures the bearing holding member. By merging these multiple fixing functions into a single screw member, the number of parts is reduced and weight is decreased while maintaining comprehensive fixation reliability
Data Source
AI summary
A power tool includes: a motor; a motor housing that houses the motor; a rotation mechanism disposed on a front side of the motor and including an output portion rotated based on a rotational force of the motor; a rotation mechanism case that is disposed on a front side of the motor housing and houses at least a part of the rotation mechanism; and a screw member that fixes the motor housing and the rotation mechanism case to each other, the screw member reaching the rotation mechanism case from a rear side of the motor housing. The motor is fixed together with the motor housing and the rotation mechanism case by the screw member.