Power Tool Bearing Layout for Shorter Front-Rear Length
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Solution Overview
Problem
Existing power tools have a large total length due to the arrangement of bearings on both the front and rear surfaces of the support plate, increasing the dimension in the front-rear direction.
Innovation Solution
A power tool design that includes a bearing holding member which holds a second bearing that supports a first bearing via a rotating member, allowing both bearings to be arranged on the same plane, reducing the dimension of the bearing holding member in the front-rear direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bearings are arranged on both front and rear surfaces of the support plate, then bearing support function is improved, but the dimension in the front-rear direction increases
Solution Approach 1:
The patent transitions from arranging bearings on separate front and rear surfaces (two-dimensional arrangement) to arranging both bearings on the same front surface (one-dimensional arrangement), thereby reducing the front-rear dimension while maintaining bearing support functionality through the rotating member's holding capability
Solution Approach 2:
The rotating member functions as a holding member that nestedly holds the first bearing within its structure, allowing the first bearing to be positioned on the front surface of the support plate in proximity to the second bearing, thus consolidating the bearing arrangement in a compact configuration
Data Source
AI summary
A power tool includes: a motor including a rotor that rotates about a rotation axis and a stator disposed around the rotor; a first bearing that supports the rotor in a rotatable manner; a rotating member that is rotated by the rotor; a second bearing that supports the rotating member in a rotatable manner; and a bearing holding member that holds the second bearing. The second bearing holds the first bearing via the rotating member.