Power Tool Double Housing Resin Metal Insulation
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Solution Overview
Problem
Power tools face challenges in ensuring insulation of electric components and maintaining the accuracy of the housing's outer circumferential surface, as resin housings deform due to moisture absorption or temperature changes, while metal housings lack adequate insulation.
Innovation Solution
A double housing structure is implemented, with an internal resin housing for insulation and an external metal housing to prevent deformation, ensuring reliable electrical and thermal insulation and maintaining the accuracy of the contact surface, allowing smooth movement of the tool unit relative to the base device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is made of resin to ensure insulation of electric components, then insulation is improved, but the housing deforms due to moisture absorption or temperature changes
Solution Approach 1:
The housing is constructed as a composite structure with an inner resin portion for electrical insulation and an outer metal portion for dimensional stability. The resin portion maintains insulation properties while the metal portion prevents deformation from moisture and temperature changes, resolving the contradiction between insulation reliability and configuration stability.
2Stability of the object's composition
If the housing is made of metal to prevent deformation, then stability of outer circumferential surface is improved, but insulation of electric components deteriorates
Solution Approach 1:
The housing combines metal and resin materials in a layered structure where the inner resin portion provides electrical insulation for components while the outer metal portion ensures dimensional stability and prevents deformation. This composite approach simultaneously achieves both insulation reliability and configuration stability.
Solution Approach 2:
The housing is divided into two functional segments: an inner resin portion dedicated to electrical insulation and an outer metal portion dedicated to structural stability. This segmentation allows each material to perform its optimal function without compromising the other, resolving the contradiction between insulation and stability.
3Reliability
If the housing is made of resin to ensure insulation, then electrical insulation is improved, but manufacturing precision of contact surface deteriorates
Solution Approach 1:
The outer metal portion is specifically designed to define the contact surface with high precision, while the inner resin portion maintains electrical insulation. The metal portion's inherent dimensional stability ensures accurate contact surface geometry, resolving the contradiction between insulation reliability and manufacturing precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The double housing structure provides effective insulation and prevents deformation, ensuring the tool unit can be accurately positioned and smoothly moved, maintaining the integrity of the housing's configuration and size.
Implementation Method 1
The internal housing portion may be made of a first material... for ensuring insulation of the drive motor and the other electric components disposed within the housing
Implementation Method 2
the resin molded housing is deformed due to absorption of moisture or is flexed due to change of temperature
Implementation Method 3
deformed due to absorption of moisture
Data Source
AI summary
A power tool has a tool unit and a base device. The tool unit has a housing having a drive device disposed therein. The base device has a clamp surface that can clamp a contact surface of the housing for supporting the tool unit. The housing may include an internal housing portion and an external housing portion positioned on an outer side of the internal housing portion. The external housing portion may define the contact surface of the housing. The internal housing portion may be made of a first material. The external housing portion may be made of a second material that is different from the first material.