Impact Rotation Tool Vibration Reducer Design

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Solution Overview

Problem

Existing impact rotation tools transmit striking vibrations to the motor, which can cause breakage of the motor coil, separation of the magnet, or other damage due to the lack of vibration attenuation.

Innovation Solution

Incorporating a vibration reducer, such as motor vibration rubber guards, between the housing and the motor seat to absorb and reduce the striking vibrations transmitted to the motor.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the motor seat and housing are both rigid bodies, then the motor is securely held and positioned, but striking vibration is transmitted to the motor causing potential damage

Engineering Contradiction:

Improvemotor holding stabilityVSAvoidstriking vibration transmission

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A vibration reducer is introduced as an intermediary component between the motor seat and housing. This mediator absorbs and attenuates striking vibrations while maintaining the secure positioning of the motor, thus resolving the contradiction between stable motor holding and vibration transmission prevention

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The vibration reducer changes the mechanical parameters (rigidity, damping characteristics) of the connection between motor seat and housing. By modifying these parameters, the system achieves both secure motor positioning and vibration attenuation, preventing transmission of harmful strikes to the motor

Inventive Principle:

Principle #35Parameter changes

2Reliability

If vibration reducer is added to attenuate striking vibration, then motor damage is prevented, but device complexity increases

Engineering Contradiction:

Improvemotor protection from vibrationVSAvoidhousing structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The vibration reducer is applied locally at the critical interface between motor seat and housing where vibration transmission occurs. This localized approach provides motor protection without requiring complex vibration attenuation mechanisms throughout the entire device structure

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The vibration reducer is designed as a simple, cost-effective component that can be easily replaced if needed. This approach protects the expensive motor from vibration damage while using a relatively simple and economical vibration reduction element

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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 vibration reducers effectively attenuate the striking vibrations, preventing motor damage and ensuring efficient torque transmission for fastening and loosening operations without compromising the motor's integrity.

Implementation Method 1

The vibration reducer is located in the housing to reduce striking vibration transmitted to the motor

Methodology Applied

Scientific EffectVibration attenuation: Damping

Data Source

PatentUS10335931B2Impact rotation tool

Publication Date: 2019.07.02 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

An impact rotation tool includes a motor, an impact mechanism, and a housing, which covers the motor and the impact mechanism. The impact mechanism includes an output shaft, which is rotatable by the motor, and an anvil, which is rotatable integrally with the output shaft. The impact mechanism applies a striking impact to the anvil when the motor outputs rotation. The impact rotation tool further includes a motor seat and a vibration reducer. The motor seat is fastened to the motor to hold the motor in the housing. The vibration reducer is located in the housing to reduce striking vibration transmitted to the motor.