Mower Motor Cooling via Guide Member Airflow Passage
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Solution Overview
Problem
Conventional mowers that use a motor to rotationally drive a rotary blade generate heat, necessitating effective cooling methods to prevent motor overheating and maintain performance.
Innovation Solution
A mower design incorporating a guide member forming an air flow passage along the motor, with fins extending from the motor's side surface to enhance cooling, and a fan driven by the motor to circulate air from the exterior to the interior, increasing airflow and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a motor is used to drive the rotary blade, then the mower can cut grass effectively, but the motor generates heat that requires cooling
Solution Approach 1:
The patent converts the harmful heat generated by the motor into a beneficial cooling mechanism. The heat causes air to expand and rise, creating a natural convection current that draws cool air from the exterior through the air flow passage and across the motor, effectively cooling the motor using its own heat generation as the driving force.
Solution Approach 2:
The patent employs pneumatic principles by utilizing air flow and pressure differentials to cool the motor. The guide member forms an air flow passage that directs ambient air across the motor, and the natural convection of heated air creates a continuous cooling flow without requiring mechanical cooling components.
2Temperature
If a guide member forms an air flow passage along the motor, then cooling efficiency is improved, but the device complexity increases
Solution Approach 1:
The guide member serves multiple functions: it forms the air flow passage for cooling, provides structural support for the motor, and potentially acts as a mounting surface for the fin. This multi-functionality reduces the need for separate cooling components, thereby limiting the increase in device complexity while still achieving effective cooling.
Solution Approach 2:
The patent merges the cooling function with the existing motor housing or support structure by forming the air flow passage along the motor using the guide member. This integration combines the structural and cooling functions into a single component, minimizing additional complexity.
3Temperature
If fins are added to the motor side surface, then heat dissipation is improved, but the manufacturing complexity increases
Solution Approach 1:
The fin structure changes the surface area parameter of the motor housing, increasing heat dissipation capability. The fin extends the surface area of the motor side surface, allowing more efficient heat transfer to the surrounding air flow without fundamentally changing the motor's core manufacturing process.
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 motor is effectively cooled through increased airflow and surface area, preventing overheating and maintaining the mower's operational efficiency without the need for a separate drive source for the fan.
Implementation Method 1
a fan, which sends air from the exterior of the mower deck to the interior via the air flow passage
Implementation Method 2
the motor includes at least one fin, which is formed so as to extend outward from the side surface, and such that an outer edge portion of the fin touches the guide member
Data Source
AI summary
A mower includes a rotary blade cutting grass due to being rotationally driven. A work motor rotationally drives the rotary blade. A mower deck houses the rotary blade in an interior thereof. A first shroud forms an air flow passage along the work motor. The air flow passage connects the interior and exterior of the mower deck.