Electric Power Tool Magnet Coupling for Quieter Rotary Impacts
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Solution Overview
Problem
Existing electric power tools, such as drill drivers and rotary impact tools, produce significant noise due to mechanical torque transmission and impact mechanisms, necessitating improved quietness.
Innovation Solution
The implementation of a magnet coupling mechanism for contactless torque transmission, which includes a driving magnet member and a driven magnet member with alternating S-poles and N-poles, allows for quiet operation by transmitting torque magnetically and applying intermittent rotary impacts through synchronization loss and relative rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If mechanical torque transmission is used in electric power tools, then torque transmission efficiency is maintained, but noise is generated due to mechanical contact and impact
Solution Approach 1:
The patent replaces the mechanical torque transmission system with a magnetic coupling system. The driving magnet member and driven magnet member generate magnetic attraction forces to transmit torque without mechanical contact, thereby eliminating mechanical impact noise while maintaining torque transmission efficiency. This substitution of mechanical interaction with magnetic field interaction directly addresses the noise problem.
Solution Approach 2:
The patent introduces a magnetic field as an intermediary between the driving shaft and output shaft. The magnetic coupling mechanism acts as a mediator that transmits torque through magnetic attraction forces rather than direct mechanical contact. This intermediary approach allows torque transmission while avoiding the mechanical contact that causes noise.
2Productivity
If a rotary impact mechanism is used to apply striking impact, then work capability is enhanced, but impact noise is produced when the hammer strikes the anvil
Solution Approach 1:
The patent replaces the traditional mechanical hammer-anvil impact mechanism with a magnetic coupling system that applies intermittent rotary impacts through magnetic attraction forces. The driving magnet member and driven magnet member create magnetic forces that produce rotational impacts without direct mechanical striking, thereby maintaining work capability while eliminating impact noise.
Solution Approach 2:
The patent employs periodic magnetic attraction and release cycles to create intermittent rotary impacts. The magnetic coupling mechanism periodically engages and disengages, producing rhythmic rotational impacts that provide the necessary work capability. This periodic magnetic action replaces the continuous mechanical impact of traditional hammers, reducing noise while maintaining effectiveness.
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 magnet coupling mechanism effectively reduces noise by transmitting torque without mechanical contact and applies intermittent rotary impacts, enhancing tool quietness while maintaining high torque transmission efficiency.
Implementation Method 1
a magnet coupling (20) including a driving magnet member (21) coupled to a side of the driving shaft (4) and a driven magnet member (22) coupled to a side of the output shaft (6), and driving magnet member (21) and driven magnet member (22) being provided such that magnetic surfaces (21c, 22c) face each other, S-poles and N-poles being alternately arranged on magnetic surfaces (21c, 22c)
Data Source
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AI summary
An electric power tool 1 comprising: a driving shaft 4 that is rotated by a motor 2; an output shaft 6 on which a front-end tool is attachable; and a torque transmission mechanism 5 that transmits a torque produced by the rotation of the driving shaft 4 to the output shaft 6, wherein the torque transmission mechanism 5 includes a magnet coupling 20, 20a, 20b including a driving magnet member 21, 31 coupled to a side of the driving shaft 4 and a driven magnet member 22, 32 coupled to a side of the output shaft 6, the driving magnet member 21, 31 and the driven magnet member 22, 32 are provided such that respective magnetic surfaces 21c, 22c face each other, S-poles and N-poles being alternately arranged on each of the magnetic surfaces, and the magnet coupling 20, 20a, 20b has a function of applying an intermittent rotary impact force to the output shaft 6.