Intermediate Element Reduces Heat Transfer in Hand-Held Power Tool
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Solution Overview
Problem
Hand-held power tools with plastic housings face damage due to heat generated during operation, as existing thermal insulation methods are complex and inefficient.
Innovation Solution
A simple configuration where the first bearing is supported by an intermediate element within a receptacle of the power tool housing, with a reduced support surface area less than 50% of an imaginary circular ring, reducing heat transfer and allowing uniform heat dissipation, and incorporating a grid-shaped structure with ribs and recesses for enhanced cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a thermal insulation coating is applied to the bearing element, then heat transfer to the housing is reduced, but the device complexity and manufacturing cost increase
Solution Approach 1:
An intermediate element is introduced between the bearing and the housing receptacle. This intermediate element serves as a thermal mediator with lower thermal conductivity than the housing material, reducing heat transfer from the bearing to the housing without requiring complex coatings on the bearing itself.
Solution Approach 2:
The thermal conductivity parameter is changed by selecting an intermediate element material with lower thermal conductivity than the housing material. This material parameter change achieves thermal insulation functionality through the intermediate element's inherent properties rather than through complex surface treatments.
2Device complexity
If the bearing is directly supported on the housing, then the structure is simple, but excessive local heating of the housing occurs
Solution Approach 1:
The intermediate element acts as a thermal mediator between the bearing and housing, distributing and reducing heat transfer to the housing while maintaining structural support functionality.
Solution Approach 2:
The intermediate element is positioned specifically in the receptacle area where heat transfer occurs, providing localized thermal insulation exactly where needed without affecting the overall structural simplicity of the bearing support system.
3Stability of the object's composition
If a large support surface area is used, then mechanical stability is high, but heat transfer to the housing increases
Solution Approach 1:
The intermediate element provides sufficient mechanical support at specific contact points while its lower thermal conductivity material ensures that even with contact, heat transfer is minimized. The support surface area is optimized to provide stability without maximizing thermal contact.
Solution Approach 2:
The intermediate element is made of material that combines adequate mechanical strength for support with lower thermal conductivity, creating a composite solution that simultaneously addresses both mechanical stability and thermal insulation requirements.
Data Source
AI summary
A hand-held power tool has a power tool housing made at least partially of plastic material. A drive motor is arranged in the power tool housing and a drive shaft driven connected to the drive motor is provided. A tool member is connected to the drive shaft and driven by the drive motor through the drive shaft. A first bearing rotatably supports the drive shaft relative to the power tool housing. An intermediate element supports the first bearing relative to the power tool housing. The intermediate element is arranged in a receptacle of the power tool housing and is supported on a support surface relative to the bottom of the receptacle. The support surface is less than approximately 50% of an imaginary circular ring surface defined between an outer circumference of the first bearing and the circumcircle of the receptacle.