Riding Lawn Mower Motor Cooling Using Deck Airflow
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Solution Overview
Problem
Riding lawn mowers face challenges with high motor temperatures due to their high output power, leading to increased maintenance costs and environmental pollution from diesel fuel.
Innovation Solution
The design incorporates a first motor with a rotor assembly and stator assembly, where the motor housing is partially located in the mowing space, and an airflow channel allows cooling airflow to enter the mowing space, effectively cooling the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the motor output power is increased to meet high power requirements, then the motor temperature rises excessively
Solution Approach 1:
The patent moves the motor from a traditional horizontal mounting configuration to a vertical mounting configuration, where the motor shaft extends in the vertical direction. This dimensional change allows the motor to be positioned such that its cooling surface faces the downward airflow generated by the mower deck, enabling effective cooling without compromising power output.
Solution Approach 2:
The patent utilizes the airflow generated by the mower deck operation to cool the motor. The downward airflow created during mowing is directed through the motor housing, providing passive pneumatic cooling that reduces motor temperature without requiring additional active cooling systems.
2Power
If diesel fuel is used to power the riding lawn mower, then high power output is achieved, but environmental pollution increases and maintenance costs rise
Solution Approach 1:
The patent replaces the diesel fuel combustion system with an electric motor system. This substitution eliminates the harmful emissions associated with diesel combustion while providing sufficient power output for lawn mowing operations, thereby reducing environmental pollution and maintenance requirements.
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 solution provides a riding lawn mower with an improved cooling effect, reducing motor temperature and associated maintenance costs while promoting environmental sustainability by potentially using electric power instead of diesel.
Implementation Method 1
an airflow channel allowing a cooling airflow outside the mowing space to pass through the airflow channel and the first through hole to enter the mowing space
Data Source
AI summary
A riding lawn mower includes a seat, a frame, a mowing element, a deck surrounding, and forming a mowing space for accommodating at least part of the mowing element, and a first motor for driving the mowing element to rotate. The riding lawn mower may further include a footrest provided on a front side of the seat and used to support a user's feet, wherein the footrest comprises a bottom plate and a front cover protruding relative to the bottom plate. The riding lawn mower may include an indicator device for displaying a remaining capacity of the power supply device, and the indicator device is at least partially mounted to the front cover of the footrest.