Electric Working Machine Heat Dissipation via Metal Support Rod

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Solution Overview

Problem

The control unit in electric working machines generates excessive heat due to increased motor output, leading to potential malfunctions if not adequately cooled.

Innovation Solution

A heat transfer structure is integrated to transfer heat from the control unit to a metal support rod, which acts as a heat dissipator, and a fan-driven cooling system enhances heat dissipation within the support rod, while a sealed housing protects the control unit from water and dust.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If the output of the motor is increased, then the power of the electric working machine is improved, but the heat generated by the control unit increases correspondingly

Engineering Contradiction:

Improvemotor outputVSAvoidcontrol unit temperature

Core Design Contradiction:

PowerVSTemperature

Solution Approach 1:

The patent converts the harmful heat generated by the control unit into a beneficial cooling mechanism by transferring it to the support rod, which then dissipates the heat to the surrounding air, thereby preventing overheating while maintaining high motor output

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The support rod acts as an intermediary heat transfer medium between the control unit and the surrounding air. The heat transfer structure conducts heat from the control unit to the support rod, which then dissipates it to the environment, effectively managing thermal load

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

This configuration significantly improves cooling performance for the control unit, preventing overheating and ensuring reliable operation while allowing safe handling of the device even when the support rod is at high temperatures.

Implementation Method 1

a heat transfer structure configured to transfer heat of the control unit to the support rod

Methodology Applied

Scientific EffectThermal conduction: Conduction (thermal)

Implementation Method 2

the support rod can function as a heat dissipator that dissipates the heat of the control unit

Methodology Applied

Scientific EffectThermal radiation: Thermal Radiation

Implementation Method 3

the support rod can function as a heat dissipator that dissipates the heat of the control unit

Methodology Applied

Scientific EffectConvection: Convection

Data Source

PatentUS11559916B2Electric working machine

Publication Date: 2023.01.24 MAKITA CORP

AI summary

An electric working machine may include: a support rod constituted of metal; a tool disposed at a front end of the support rod; a motor configured to drive the tool; a control unit disposed at a rear end of the support rod and configured to control the motor; and a heat transfer structure configured to transfer heat from the control unit to the support rod.