Magnetic Gear Arrangement for Hand-Held Power Tools

Solution Overview

Problem

Hand-guided and hand-held power tools face issues with wear, noise emission, weight, size, vibrations, and maintenance requirements due to mechanical gear arrangements, which are prone to wear and require lubrication and cooling.

Innovation Solution

The use of magnetic gear arrangements that transmit rotational movement and torque without mechanical contact, providing overload protection, reducing noise and vibrations, and eliminating the need for lubrication and maintenance, by utilizing magnetic fields to transfer power between the motor and the working element.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical gear arrangements are used to transmit rotational movement and torque, then torque transmission is achieved, but wear and maintenance requirements increase

Engineering Contradiction:

ImprovedurabilityVSAvoidmaintenance requirements

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces mechanical gear arrangements with a magnetic gear arrangement that uses magnetic fields to transmit rotational movement and torque. The magnetic coupling between the motor shaft and working element eliminates mechanical contact, thereby eliminating wear and maintenance requirements while maintaining reliable torque transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the motor shaft and working element. This magnetic field acts as a mediator to transmit torque without direct mechanical contact, resolving the contradiction between achieving torque transmission and avoiding wear.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Power

If mechanical gear arrangements are used, then torque transmission is achieved, but noise emission increases

Engineering Contradiction:

Improvetorque transmissionVSAvoidnoise emission

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent replaces mechanical gear arrangements with a magnetic gear arrangement that uses magnetic fields to transmit rotational movement and torque. The magnetic coupling between the motor shaft and working element eliminates mechanical contact, thereby eliminating wear and maintenance requirements while maintaining reliable torque transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the motor shaft and working element. This magnetic field acts as a mediator to transmit torque without direct mechanical contact, resolving the contradiction between achieving torque transmission and avoiding wear.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Power

If mechanical gear arrangements are used, then torque transmission is achieved, but vibrations increase

Engineering Contradiction:

Improvetorque transmissionVSAvoidvibrations

Core Design Contradiction:

PowerVSObject-generated harmful factors

Solution Approach 1:

The patent replaces mechanical gear arrangements with a magnetic gear arrangement that uses magnetic fields to transmit rotational movement and torque. The magnetic coupling between the motor shaft and working element eliminates mechanical contact, thereby eliminating wear and maintenance requirements while maintaining reliable torque transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the motor shaft and working element. This magnetic field acts as a mediator to transmit torque without direct mechanical contact, resolving the contradiction between achieving torque transmission and avoiding wear.

Inventive Principle:

Principle #24Intermediary (Mediator)

4Power

If mechanical gear arrangements are used, then torque transmission is achieved, but weight and size increase

Engineering Contradiction:

Improvetorque transmissionVSAvoidtool weight

Core Design Contradiction:

PowerVSWeight of moving object

Solution Approach 1:

The patent replaces mechanical gear arrangements with a magnetic gear arrangement that uses magnetic fields to transmit rotational movement and torque. The magnetic coupling between the motor shaft and working element eliminates mechanical contact, thereby eliminating wear and maintenance requirements while maintaining reliable torque transmission.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a magnetic field as an intermediary between the motor shaft and working element. This magnetic field acts as a mediator to transmit torque without direct mechanical contact, resolving the contradiction between achieving torque transmission and avoiding wear.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 magnetic gear arrangement enhances durability, reduces noise and vibrations, and provides low-maintenance operation with high reliability, protecting the tool and user from excessive force, while maintaining high torque transmission efficiency.

Implementation Method 1

at least one magnetic gear arrangement using magnetic fields to transmit the rotational movement and torque from the motor to the working element without mechanical contact

Methodology Applied

Scientific EffectMagnetic field: Magnetic Field

Data Source

PatentUS11325238B2Hand guided and/or hand held electric or pneumatic power tool

Publication Date: 2022.05.10 VALENTINI GUIDO (I) (IT)

AI summary

The invention refers to a hand guided and/or hand held electric or pneumatic power tool (1, 1′), comprising an electric or pneumatic motor (15, 100), a working element (9) realizing a working movement (11), when the motor (15, 100) is activated, and at least one gear arrangement functionally located between the motor (15, 100) and the working element (9) for transmitting a rotational movement and torque from the motor (15, 100) to the working element (9) in order to realize the working movement (11). It is suggested that the at least one gear arrangement is embodied as a magnetic gear arrangement (20, 21, 41) using magnetic fields to transmit the rotational movement and torque from the motor (15, 100) to the working element (9) without mechanical contact, in order to realize the working movement (11).