Riding Lawn Mower Motor Airflow Channel for Cooling
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Solution Overview
Problem
Riding lawn mowers face challenges with motor temperature rise during operation, particularly due to high output power, and existing solutions do not effectively address the cooling needs.
Innovation Solution
The design incorporates a riding lawn mower with a first motor that partially extends into the mowing space, featuring a rotor assembly, stator assembly, and motor housing. An airflow channel is formed between supporting and mounting portions of the motor housing, allowing cooling airflow to enter the mowing space through a first through hole in the deck.
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 during operation
Solution Approach 1:
The patent utilizes the harmful hot air generated by motor operation and converts it into a beneficial cooling mechanism. The hot air exhaust outlet directs hot air away from the motor, while the cold air inlet introduces cooler ambient air to replace it, creating a natural convection current that continuously cools the motor during high-power operation without requiring additional cooling components
Solution Approach 2:
The patent employs pneumatic principles by utilizing air flow to achieve motor cooling. The housing includes a cold air inlet and a hot air exhaust outlet that work together to create a forced air circulation system, using the movement of air (pneumatics) to remove heat from the motor, thereby addressing the temperature rise issue during high output power operation
2Temperature
If a traditional cooling system is added to cool the motor, then the device complexity increases
Solution Approach 1:
The motor cooling system is designed to be self-regulating and automatic. The housing structure itself provides the cooling function through integrated cold air inlet and hot air exhaust outlets. The system uses natural convection and pressure differentials created during motor operation to drive air flow, eliminating the need for external fans, sensors, or control mechanisms, thereby maintaining device simplicity while achieving effective cooling
Solution Approach 2:
The cooling function is merged with the motor housing structure. The housing is designed to incorporate both the cold air inlet and hot air exhaust outlet directly into its body, combining the structural support function with the thermal management function. This integration eliminates separate cooling components and reduces overall system complexity while maintaining effective motor cooling
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 effectively generates a cooling airflow to cool the motor, reducing temperature rise and improving operational efficiency.
Implementation Method 1
a rotor assembly including a rotor shaft enabled to rotate about a rotation axis; a stator assembly including a stator coil and a stator core
Implementation Method 2
a rotor assembly including a rotor shaft enabled to rotate about a rotation axis; a stator assembly including a stator coil and a stator core
Implementation Method 3
an airflow channel communicating with the first through hole is formed between the supporting portion and the mounting portion; when the mowing element rotates, the airflow channel allows 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 cutting system comprising a mowing element for cutting vegetation and a deck surrounding and forming a mowing space for accommodating at least part of the mowing element. The riding lawn mower includes a walking system comprising walking wheels and a power supply device for providing power to the cutting system. The riding lawn mower includes a housing system comprising a storage box for placing an item and a USB interface is provided in the storage box for charging a device.