Shock-Absorbing Tool Housing With Controlled Elastic Compression
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Solution Overview
Problem
Conventional electric tool housings face issues with varying gaps between shells due to torque control difficulties, leading to inconsistent compression ratios of elastic bodies, which can result in either over-compression or no compression, affecting shock absorption effectiveness.
Innovation Solution
A shock-absorbing housing design featuring a shell unit with limiting portions and a shock-absorption unit containing elastic bodies with specific compressive sections, allowing for controlled compression ratios that maintain effective shock absorption despite dimensional tolerances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gap between shells is reduced to prevent over-compression, then the compression ratio is controlled, but the shock absorption effect deteriorates due to insufficient compression
Solution Approach 1:
The elastic body is divided into two functional segments: a protruding portion for shock absorption and a non-protruding portion for positioning. This segmentation allows the protruding portion to be compressed while maintaining a minimum gap, preventing over-compression while ensuring sufficient shock absorption effect.
Solution Approach 2:
The non-protruding portion of the elastic body acts as an intermediary element between the shell and the protruding portion. It maintains a controlled gap that prevents direct contact and over-compression, while still allowing the protruding portion to compress sufficiently for shock absorption.
2Reliability
If the original length of the protruding portion is reduced to avoid over-compression, then the compression ratio is controlled, but the shock absorption effect deteriorates due to insufficient compression
Solution Approach 1:
The elastic body is divided into two functional segments: a protruding portion for shock absorption and a non-protruding portion for positioning. This segmentation allows the protruding portion to be compressed while maintaining a minimum gap, preventing over-compression while ensuring sufficient shock absorption effect.
Solution Approach 2:
Different portions of the elastic body have different functional qualities: the protruding portion is optimized for compression and shock absorption, while the non-protruding portion is optimized for positioning and maintaining the gap. This local differentiation allows each part to perform its specific function effectively.
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 design ensures consistent compression ratios for the elastic bodies, preventing excessive compression and maintaining optimal shock absorption performance even with varying shell gaps, thus improving the overall shock absorption effect.
Implementation Method 1
Each of the elastic bodies 131 has a protruding portion 132 that protrudes from an inner surface of the housing 11 in an axis direction (X) and that is adapted to be pushed by the switch 12 to deform elastically. The protruding portions 132 of the elastic bodies 131 absorb vibration energy
Implementation Method 2
a compression length (d3) (i.e., an amount of compression) of each of the protruding portions 132 in the axis direction (X) is 0.35 mm, a compression ratio of each protruding portion 132 can be calculated and preset to be 0.35/0.5=70%
Data Source
AI summary
A shock-absorbing housing for an electric tool includes a shell unit and a shock-absorption unit connected to the shell unit. The shell unit includes limiting portions each having a first hole-defining section that defines a first hole, and a second hole-defining section that defines a second hole. The first hole has a diameter greater than that of the second hole. The shock-absorption unit includes elastic bodies. Each of the elastic bodies includes a first compressive section that extends through the first hole and that is spaced apart from the first hole-defining section, and a second compressive section that is opposite to the first compressive section and that extends through the second hole. The first compressive section has a protruding portion that protrudes outwardly from the first hole-defining section, and that is adapted for abutting against a trigger device of the electric tool.