Power Head Layout With Ventilated Motor Cavity Cooling
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Solution Overview
Problem
Conventional power heads face issues such as unreasonable structure, heat concentration, difficulty in heat dissipation, and complex assembly, particularly in lithium battery-driven motors used in garden tools, which also suffer from large vibration, high noise, and serious pollution.
Innovation Solution
A power head design featuring a motor bracket with a motor assembly cavity, a housing with a gap, and a battery pack, where the motor rotor and stator are directly assembled, enhancing heat dissipation through a heat dissipation passage with fans and ventilation openings, and a compact, easy-to-assemble structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motor is assembled in a protected cavity, then the motor is protected, but heat dissipation becomes difficult and heat concentration occurs
Solution Approach 1:
The patent uses a protective cavity with heat dissipation passages that allow thermal energy to transfer through the cavity walls. The cavity structure incorporates thin film or shell designs that maintain mechanical protection while enabling heat transfer to the external environment, resolving the contradiction between protection and heat dissipation.
2Reliability
If the motor is assembled in a protected cavity, then the motor is protected, but assembly becomes complex
Solution Approach 1:
The patent integrates the protective cavity structure with the motor assembly by directly assembling the motor within the cavity space. The motor bracket and cavity are designed as a unified structure where the motor components (stator, rotor, output shaft) are directly mounted, eliminating the need for separate assembly steps and reducing overall complexity while maintaining protection.
3Ease of manufacture
If the output shaft is perpendicular to the machine installation surface, then the structure is conventional, but the power head has unreasonable structure for modern applications
Solution Approach 1:
The patent changes the orientation parameter of the output shaft from perpendicular to parallel relative to the machine installation surface. This parameter modification optimizes the power transmission path, improves the overall structural layout, and enhances adaptability for modern power tool applications while maintaining manufacturability through standard machining processes.
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 design improves heat dissipation capacity, reduces assembly complexity, and addresses vibration and noise issues, making it a suitable replacement for gasoline engines with enhanced environmental friendliness.
Implementation Method 1
heat dissipation passage with fans and ventilation openings
Data Source
AI summary
A power head includes a motor bracket, a housing, a motor and a battery pack. The motor bracket is provided with a motor assembly cavity, and a bottom of the motor bracket is provided with a machine installation surface. The housing is fixed above the motor bracket, and a gap is formed between the housing and the motor bracket. The motor includes a motor stator, a motor rotor and an output shaft. The motor stator is fixedly assembled in the motor assembly cavity. The motor rotor is assembled in the motor assembly cavity and rotates with respect to the motor stator. The output shaft is fixed with the motor rotor, and the output shaft is substantially parallel to the machine installation surface. The battery pack is installed in the housing to provide energy for the power head.