Power Tool Dynamic Vibration Reducer Mechanism
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Solution Overview
Problem
Existing power tools with dynamic vibration reducers have complex and irrational constructions due to aligned crank mechanisms for hammering and vibration reduction, which complicates weight saving and efficiency.
Innovation Solution
A power tool design that incorporates a dynamic vibration reducer with a forcible vibration exerting mechanism, featuring a weight surrounded by springs and an eccentric cam mechanism, actively drives the vibration reducer to reduce vibrations during operation, simplifying the construction and reducing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a second crank mechanism is disposed at one side of the crank mechanism opposed to the motor to actuate the dynamic vibration reducer, then vibration generated during operation is decreased, but the construction of the power tool becomes complicated and irrational for weight saving
Solution Approach 1:
The patent combines the vibration reduction function with the existing crank mechanism by disposing the second crank mechanism adjacent to and integrated with the first crank mechanism, rather than separating them. This merging approach allows the dynamic vibration reducer to be actuated while maintaining a compact, rational construction that avoids excessive complexity and weight.
2Object-affected harmful factors
If a second crank mechanism is disposed at one side of the crank mechanism opposed to the motor, then vibration generated during operation is decreased, but the power tool size increases
Solution Approach 1:
The patent implements a nested arrangement where the second crank mechanism is disposed within the spatial envelope of the first crank mechanism and motor assembly. The second crank mechanism is positioned adjacent to the motor with its axis extending in the longitudinal direction, allowing it to be nested within the existing structural footprint rather than adding external volume, thus reducing overall power tool size while maintaining vibration reduction capability.
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 vibrations during hammering operations while simplifying the tool's design and reducing its size and weight, enhancing operational efficiency and cost-effectiveness.
Implementation Method 1
a second crank mechanism which is disposed at one side of the crank mechanism opposed to the motor and actuates a weight (153) of a dynamic vibration reducer (151) aggressively
Implementation Method 2
a dynamic vibration reducer (151) which comprises a weight (153) and springs (155F, 155R)
Data Source
AI summary
A power tool, which actuates a tool (119) linearly in a longitudinal direction of the tool (119) the power tool performs a predetermined operation to a workpiece, comprising: a drive mechanism (113,115) which actuates the tool (119); a rotational shaft (121) which actuates the drive mechanism (113, 115); a swing lever (167) which swings along the longitudinal direction by a rotational motion of the rotational shaft; and a dynamic vibration reducer (151) which alleviates vibration generated during the predetermined operation. The dynamic vibration reducer (151) includes a weight (153) which is linearly movable in the longitudinal direction an elastic member (155F, 155R) which biases the weight (153). The weight (153) is adapted to be actuated mechanically and forcibly by a motion component with respect to the longitudinal direction of a swinging motion of the swing lever (167) in a state that the weight (153) is biased by the elastic member (155F, 155R).