Power Tool Anti-Vibration Assembly Design
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Solution Overview
Problem
Existing power tools, particularly portable ones, suffer from vibration transmission that reduces their manipulability, and existing anti-vibration solutions either fail to effectively reduce vibration or increase manufacturing costs and ergonomics issues.
Innovation Solution
An anti-vibration assembly is integrated into the power tool, comprising anti-vibration members between the supporting unit and the outer housing, which are free of direct contact with the inner housing, to absorb vibration energy before it reaches the outer housing, using elastomeric elements or rubber pins that extend perpendicular to the output shaft axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a thicker elastomeric film is wrapped on the handle portion to absorb more vibration, then vibration absorption effectiveness is improved, but manufacturing cost increases and ergonomic grip deteriorates
Solution Approach 1:
The anti-vibration function is segmented into multiple discrete anti-vibration members (first anti-vibration member between supporting unit and outer housing, second anti-vibration member between inner housing and outer housing) rather than using a single thick continuous film. This segmentation allows effective vibration absorption while maintaining manufacturing simplicity and ergonomic grip on the handle portion.
Solution Approach 2:
The patent introduces intermediary anti-vibration members that act as mediators between the supporting unit and outer housing, and between inner housing and outer housing. These intermediary elements absorb vibration energy without requiring thick elastomeric films on the handle, thus reducing manufacturing cost while maintaining vibration reduction effectiveness.
2Object-affected harmful factors
If a thicker elastomeric film is wrapped on the handle portion to absorb more vibration, then vibration absorption effectiveness is improved, but ergonomic grip deteriorates
Solution Approach 1:
The anti-vibration function is segmented into multiple discrete anti-vibration members positioned at specific locations (between supporting unit and outer housing, between inner housing and outer housing) rather than using a single thick continuous film on the handle. This segmentation maintains the handle's ergonomic grip characteristics while effectively absorbing vibration energy through the distributed anti-vibration members.
Solution Approach 2:
The intermediary anti-vibration members serve as mediators that absorb vibration energy without interfering with the user's grip on the handle portion. By positioning these members between the supporting unit/inner housing and the outer housing, the design maintains ergonomic grip while reducing vibration transmission to the user's hand.
3Object-affected harmful factors
If anti-vibration members are mounted between supporting unit and outer housing, then vibration reduction effectiveness is improved, but device complexity increases
Solution Approach 1:
The anti-vibration members serve multiple functions: they absorb vibration energy, provide mechanical isolation between components, and maintain structural integrity of the housing assembly. By making these elements multi-functional, the patent reduces the need for additional separate components, thereby limiting the increase in device complexity while achieving effective vibration reduction.
Solution Approach 2:
The patent merges the anti-vibration function with the existing housing and supporting unit structure by mounting anti-vibration members between these existing components. Rather than adding entirely separate anti-vibration systems, the design integrates vibration reduction into the existing structural framework, minimizing the increase in overall device complexity.
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
Effectively reduces vibration transmission to the outer housing, enhancing user comfort and maintaining ergonomic grip without increasing manufacturing costs.
Implementation Method 1
the first anti-vibration member is an elastomeric element
Implementation Method 2
an anti-vibration assembly configured to reduce vibration to the outer housing
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A power tool, comprising: an outer housing; a motor disposed within the outer housing; an output shaft for performing an operation on a work piece, the output shaft adapted to be driven by the motor; a bearing configured to bear the output shaft; an inner housing at least partially disposed within the outer housing and configured to receive a portion of the bearing; and an anti-vibration assembly configured to reduce vibration to the outer housing, wherein the anti-vibration assembly comprises a first anti-vibration member mounted between the bearing and the outer housing, the first anti-vibration member adapted to be in direct or indirect contact with the bearing and the outer housing and being free of direct contact with the inner housing.