Lawn Mower Power Unit Cooling via Forced Air Convection
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Solution Overview
Problem
Engine-driven lawn mowers generate excessive heat, which can damage the motor and control board, and electrical lawn mowers lack effective heat dissipation mechanisms.
Innovation Solution
A hand-pushed lawn mower design featuring a power unit with a detachable housing containing a motor and circuit board, equipped with an air inlet and outlet, and a fan that rotates to facilitate airflow for cooling, ensuring the motor and circuit board are effectively cooled.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If engine-driven or electrical lawn mowers are used, then cutting efficiency and power are improved, but heat generation increases causing damage to motor and control board
Solution Approach 1:
The patent extracts the harmful heat generated by the motor and control board by introducing a dedicated cooling system with air inlet, air outlet, and fan. The cooling mechanism separates the heat dissipation function from the cutting function, allowing the motor to operate at high power while the cooling system actively removes generated heat through forced air circulation.
2Productivity
If electrical lawn mower components (motor and control board) are used, then cutting performance is improved, but heat accumulation damages these components
Solution Approach 1:
The patent implements preliminary cooling action by positioning air inlets to direct cool air toward the motor and control board before heat accumulation becomes problematic. The fan creates continuous air flow that preemptively removes heat, preventing temperature rise that would otherwise damage components and reduce reliability.
3Temperature
If a cooling system with air inlet and outlet is added, then heat dissipation is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by integrating the fan into the existing lawn mower structure, where it serves both as a cooling device and as part of the overall power transmission system. The air inlet and outlet channels are designed to work with the housing structure, allowing the cooling system to perform heat dissipation while utilizing existing structural elements, thereby reducing overall complexity.
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 cooling mechanism extends the endurance and reliability of the lawn mower by efficiently dissipating heat, preventing damage to the motor and circuit board, and allowing for continuous operation without the need for frequent charging.
Implementation Method 1
a fan that rotates about a rotating axis... When the fan is rotated, the air flow which flows into the containing chamber from the air inlet at least contacts with the circuit board and then flows out of the containing chamber through the air outlet
Data Source
AI summary
A hand pushed lawn mower includes a power unit including a motor and a circuit board, a support device for supporting the power unit, and a fan that rotates about a rotating axis. The power unit is detachably connected with the support device and includes a power unit housing. The power unit housing includes a containing chamber for containing the motor and the circuit board, an air inlet allowing an air flow to flow into the containing chamber, and an air outlet allowing the air flow to flow out of the containing chamber. When the fan is rotated, the air flow which flows into the containing chamber from the air inlet at least passes in contact with the circuit board and then flows out of the containing chamber through the air outlet.