Chainsaw Handle Base Covering Air Inlet for Control Unit Cooling
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Solution Overview
Problem
Chainsaws with brushless electric motors face challenges in cooling their control units due to the risk of wood chips, dust, and water droplets entering through air inlets, which can contaminate the internal components and reduce cooling efficiency.
Innovation Solution
A chainsaw design featuring a handle with a base portion that covers the air inlet, positioning the control unit between the air inlet and the cooling fan to prevent contamination and ensure effective cooling, while allowing outside air to be introduced for cooling the control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an air inlet is formed in the body casing to allow outside air to be introduced for cooling the control unit, then cooling efficiency is improved, but wood chips, dusts or water droplets can enter the body casing and contaminate the control unit
Solution Approach 1:
The base portion of the handle serves as an intermediary element that selectively mediates between the need for air intake (cooling) and the need to prevent contamination. It covers the air inlet while maintaining controlled air passage, acting as a protective interface between the external environment and the control unit
Solution Approach 2:
The base portion of the handle is designed to perform multiple functions simultaneously: it structurally supports the handle assembly, provides mechanical attachment to the body casing, and functions as a protective cover for the air inlet. This multi-functionality resolves the contradiction by integrating protection and cooling functions into a single component
2Temperature
If the control unit is positioned closer to the air inlet for better cooling, then cooling efficiency is improved, but the risk of contamination by wood chips, dusts or water droplets increases
Solution Approach 1:
The base portion acts as an intermediary barrier between the air inlet and the control unit. It allows thermal coupling for cooling while providing physical protection against contaminants, enabling the control unit to be positioned optimally for cooling without direct exposure to harmful particles
3Object-affected harmful factors
If the air inlet is completely covered to prevent contamination, then protection against wood chips, dusts or water droplets is improved, but cooling of the control unit becomes insufficient
Solution Approach 1:
The base portion implements local quality by providing selective coverage - it covers the air inlet to prevent contamination while maintaining localized air passage characteristics that enable cooling. The structure creates different functional zones: a protective covering zone and a controlled air flow zone
Solution Approach 2:
The base portion functions as a flexible protective shell that covers the air inlet while allowing controlled air passage. This thin-walled structure provides protection against contaminants while maintaining thermal and fluid communication for cooling purposes
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 design effectively prevents contamination by wood chips and dust, ensuring efficient cooling of the control unit and maintaining the chainsaw's performance and reliability.
Implementation Method 1
a cooling fan is provided on a rotary shaft rotatable along with driving of the electric motor, and an air inlet is formed in a body casing to allow outside air to be introduced into the body casing therethrough during rotation of the cooling fan, to thereby cool the control unit
Data Source
AI summary
Disclosed is a chainsaw capable of introducing outside air into a body casing by rotation of a cooling fan to adequately cool a control unit provided inside the body casing. The chainsaw is configured to cool a control unit provided inside a body casing by a cooling fan being rotated under driving of an electric motor, wherein a handle comprises a base portion through which the handle (30) is attached to the body casing, and a grip formed to extend from the base portion in such a manner as to be grippable by a worker; and an air inlet is formed in a counter wall of the body casing opposed to the base portion of the handle, and wherein the base portion is attached to the counter wall of the body casing to cover the air inlet in an air introduceable state.