Power Tool Handle Vibration Damping via Rotation Urging Unit
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Solution Overview
Problem
Power tools with vibration-proof handles face a challenge in balancing initial load of the coil spring, where reducing initial load to absorb low vibrations leads to backlash, and increasing it to prevent backlash results in insufficient vibration absorption, affecting workability.
Innovation Solution
A power tool design featuring a rotation urging unit between the housing and the handle, which provides urging power to rotate the handle, reducing the initial load on the elastic unit and incorporating a stopper to restrict spacing, ensuring effective vibration damping across low and high vibration areas while preventing backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the initial load of the coil spring is reduced to absorb low vibration, then vibration absorption capability is improved, but backlash is produced due to accuracy error
Solution Approach 1:
The elastic unit is divided into multiple elastic support members (first elastic support member, second elastic support member, third elastic support member) that work together to provide cumulative elastic force. This segmentation allows the system to achieve sufficient vibration absorption without requiring a single high-load spring, thereby avoiding backlash while maintaining low initial load
Solution Approach 2:
The patent changes the structural parameters of the elastic unit by introducing multiple elastic support members with different configurations (grooves, cylindrical portions, bar portions) to distribute the elastic force. This parameter change enables the system to maintain low initial load while preventing backlash through the combined effect of multiple components
2Manufacturing precision
If the initial load of the coil spring is increased to prevent backlash, then manufacturing precision is improved, but vibration absorption in low vibration area becomes insufficient
Solution Approach 1:
The elastic unit is divided into multiple elastic support members (first elastic support member, second elastic support member, third elastic support member) that work together to provide cumulative elastic force. This segmentation allows the system to achieve sufficient vibration absorption without requiring a single high-load spring, thereby avoiding backlash while maintaining low initial load
Solution Approach 2:
The patent changes the structural parameters of the elastic unit by introducing multiple elastic support members with different configurations (grooves, cylindrical portions, bar portions) to distribute the elastic force. This parameter change enables the system to maintain low initial load while preventing backlash through the combined effect of multiple components
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 effectively reduces the initial load on the elastic unit, allowing for efficient vibration damping in the low vibration area, improving workability and preventing backlash, thereby enhancing operational ease and effectiveness.
Implementation Method 1
The coil spring is arranged in the first groove, and provided between the first elastic support member and the semi-cylindrical part. One end of the handle portion is urged by the coil spring from the tool body side in the direction of one end.
Implementation Method 2
The first elastic support member is fixed to the tool body, and forms a first groove and a second groove communicating with the first groove. The second elastic support member is fixed to one end of the handle portion.
Data Source
AI summary
An elastic unit includes a transatory unit including a first elastic support member, a second elastic support member and not-shown four round bar-shaped elastic bodies made of rubber. A rotation urging unit is composed of a Neidhart spring including an outer frame, a shaft, a rotary member, and four rubber rods. The rotary member is in a state where it is rotated at 10° counterclockwise from an initial state. Therefore, the rubber rod deforms upon reception of rolling friction from the outer frame and the rotary member, and the rotation urging unit gives the handle portion the urging power by which the handle portion is rotated so that one end of the handle portion is spaced away from a gear housing 31 in the direction of the handle portion.