Oscillating Power Tool Bearing Layout for Lower Vibration Noise
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Solution Overview
Problem
Existing oscillating power tools generate excessive noise due to high-frequency vibrations, which affects the operating experience of the operator, especially during cutting operations.
Innovation Solution
The power tool incorporates a shock absorbing mechanism with strategically positioned shock absorbers and a polarization mechanism that includes an eccentric shaft and a shift fork assembly, optimized to reduce vibration and noise by adjusting the relative positions of bearing assemblies and the oscillating member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-frequency vibration is used to drive the oscillating member for cutting operations, then cutting efficiency is improved, but noise level increases excessively
Solution Approach 1:
The patent applies vibration damping elements that convert the harmful high-frequency vibrations into beneficial shock absorption, reducing noise while maintaining cutting efficiency. The damping elements transform the excessive vibrational energy into heat through controlled dissipation, thereby converting the harmful noise-generating vibration into a beneficial damping effect.
Solution Approach 2:
The patent introduces vibration damping elements as intermediary components between the oscillating member and the tool housing. These damping elements act as mediators that absorb and reduce the high-frequency vibrations before they propagate to the housing and generate noise, while still allowing the oscillating member to maintain its cutting efficiency.
2Object-generated harmful factors
If vibration damping elements are added to reduce noise, then noise level is reduced, but device complexity increases
Solution Approach 1:
The patent merges the vibration damping function with existing structural components of the oscillating power tool. The damping elements are integrated into the housing structure and mounting mechanisms, combining noise reduction functionality with structural support and component mounting, thereby avoiding significant increases in device complexity.
Solution Approach 2:
The vibration damping elements are designed to serve multiple functions: they dampen high-frequency vibrations to reduce noise, provide shock absorption to protect internal components, and maintain structural stability during cutting operations. This multi-functionality reduces the need for separate components for each function, thereby limiting the increase in 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
The solution significantly reduces the vibration and noise of the power tool, improving the operator's experience and reducing fatigue, while also enhancing the structural stability and efficiency of the machine.
Implementation Method 1
at least two vibration damping elements are separately provided between the housing and the inner wall of the housing
Implementation Method 2
a first bearing assembly is sleeved on the output shaft, and the first bearing assembly is located on the upper side of the oscillating member; a second bearing assembly is sleeved on the output shaft, and the second bearing assembly is located on the lower side of the oscillating member
Data Source
Figure 1
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AI summary
A power tool includes a housing, a motor, a ball sleeve, an oscillating member with a mounting portion, and an output shaft rotating around an output shaft axis. The oscillating member and the ball sleeve are engaged in an engagement region on the oscillating member, and the geometric center of the engagement region is an engagement center. A first plane bisects the first bearing assembly along a direction of the output shaft axis, and a second plane bisects the second bearing assembly along the direction of the output shaft axis. The height from the engagement center to the first plane is a first height H1, the height from the engagement center to the second plane is a second height H2, and the ratio H1/H2 of the first height H1 to the second height H2 is greater than or equal to 0.5 and less than or equal to 1.4.