Impact Tool Vibration Reducing Member Positioning
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Solution Overview
Problem
Existing impact tools that rectilinearly drive tool bits via a swinging member do not adequately reduce vibrations, particularly during strong pressing operations, where vibration reduction is crucial.
Innovation Solution
The impact tool incorporates a vibration reducing member, including a dynamic vibration reducer with a weight that moves rectilinearly under an elastic biasing force, and a swinging member that rotates and swings in the axial direction, positioned close to the tool bit's working axis to enhance vibration reduction. This setup actively drives the weight to counteract vibrations, ensuring effective vibration reduction regardless of the vibration magnitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a dynamic vibration reducer is provided in the impact tool, then vibration reduction function is provided, but the vibration reducing performance is insufficient under high vibration conditions
Solution Approach 1:
The patent applies mechanical vibration principles by introducing a vibration reducing member that generates counter-vibration to cancel the harmful vibrations during hammering operation. The vibration reducing member is specifically positioned to create opposing vibrational forces that neutralize the impact vibrations transmitted to the tool body.
Solution Approach 2:
The vibration reducing member functions as a counterweight mechanism, positioned on the opposite side of the working axis from the rotating shaft. This counterweight arrangement creates balanced forces that offset the unbalanced vibrations generated by the swinging member during impact operation.
2Object-affected harmful factors
If the vibration reducing member is positioned away from the axis of vibration, then the structure is simplified, but the vibration reducing performance deteriorates
Solution Approach 1:
The patent applies local quality by positioning the vibration reducing member at a specific location close to the axis of vibration where it can most effectively counteract the harmful vibrations. This localized positioning optimizes the vibration reduction effect at the critical area without requiring complex overall structural changes.
3Productivity
If the impact tool operates under strong pressing force, then productivity increases, but vibration magnitude increases making vibration reduction more difficult
Solution Approach 1:
The vibration reducing member provides preliminary anti-action by continuously generating counter-vibrations that oppose the harmful vibrations before they can fully propagate through the tool body. This preemptive vibration cancellation works effectively regardless of the magnitude of the pressing force applied during hammering operation.
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 improves vibration reduction performance by positioning the vibration reducing member close to the axis of maximum vibration amplitude, ensuring effective operation even under high vibration conditions, such as strong pressing forces, and prevents unintentional striking movements during drilling mode.
Implementation Method 1
a weight which rectilinearly moves in the axial direction of the tool bit under a biasing force of an elastic element
Implementation Method 2
the dynamic vibration reducer forcibly drives the weight and thereby reduces vibration caused during operation of the tool bit
Data Source
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AI summary
A technique for further improving vibration reducing performance is provided in an impact tool that rectilinearly drives a tool bit in an axial direction of the tool bit via a swinging member. An impact tool includes a motor 111, a rotating shaft 125 rotationally driven by the motor 111, a swinging member 129 that swings in the axial direction of a tool bit 119 by rotation of the rotating shaft 125, a tool driving mechanism 141, 143, 145 that is connected to an end region of the swinging member 129 in a direction transverse to the axis of the rotating shaft 125, and is caused to rectilinearly move in the axial direction of the tool bit 119 by swinging movement of the swinging member 129, thereby rectilinearly driving the tool bit 119, and a vibration reducing member 151 for reducing vibration caused in the axial direction of the tool bit 119 during operation of the tool bit 119. The vibration reducing member 151 is disposed on an opposite side of a rectilinear working axis of the tool bit 119 from the rotating shaft 125 and connected to a connecting part between the swinging member 129 and the tool driving mechanism 141, 143, 145 in such a manner as to be driven.