Mower Motor Cover Vent Layout Against Grass and Water Ingress
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Solution Overview
Problem
Foreign matter such as grass, dirt, dust, and water can flow into the motor cover of a lawn mower through the cooling air exit port, causing accumulation and potential damage, especially when the cooling air current is weak or during washing.
Innovation Solution
The cooling air exit ports are positioned inside the peripheral wall of the motor cover and outside the inner hole of the cutter housing, allowing for efficient discharge of cooling air and reduction of foreign matter inflow, with inclined surfaces on the motor cover to facilitate the discharge of accumulated foreign matter and water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the cooling air exit port is positioned in the motor cover under the motor, then cooling air can be discharged into the cutter housing, but foreign matter can flow into the motor cover through the exit port
Solution Approach 1:
The cooling air exit port is repositioned from a vertical arrangement (under the motor) to a horizontal arrangement (in the peripheral wall). This dimensional change allows the port to be located outside the inner hole's projection area, enabling the cutter housing to cover it from below while the peripheral wall covers it from the side, thus blocking foreign matter pathways while maintaining cooling function
Solution Approach 2:
The cooling air exit port is nested within the peripheral wall structure rather than being a separate component. This integration allows the peripheral wall itself to serve as a protective barrier, eliminating the need for additional shielding structures while maintaining both cooling and protection functions
2Use of energy by moving object
If the cooling air current is weak during motor start or stop, then energy consumption is reduced, but foreign matter accumulation in the motor cover increases
Solution Approach 1:
The structural configuration of the cooling air exit port positioned outside the inner hole creates a preliminary protective barrier before foreign matter can enter. This passive geometric arrangement ensures protection is already in place before the motor starts or stops, eliminating the need for active measures during low-flow conditions
3Ease of manufacture
If the lawn mower is washed with the cutter housing facing upward, then cleaning effectiveness is improved, but water can flow into the motor cover through the cooling air exit port
Solution Approach 1:
By repositioning the exit port horizontally in the peripheral wall rather than vertically underneath, the design changes the exposure dimension. When the cutter housing is tilted upward for washing, the horizontal port remains protected by the peripheral wall structure, preventing water ingress while maintaining cleaning accessibility
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 prevents foreign matter and water from entering the motor cover, ensuring efficient cooling and preventing damage, while allowing for easy maintenance by allowing the motor cover to be disassembled.
Implementation Method 1
a cooling air exit port configured to discharge cooling air in the motor cover to outside
Implementation Method 2
cooling air that has cooled the motor is discharged into the cutter housing through the cooling air exit port
Data Source
AI summary
A mower comprises: a cutter housing having an inner hole in which an output shaft of a motor is inserted; and a motor cover provided above the cutter housing with a space therebetween, the motor cover covering the motor. Cooling air leadout openings for leading cooling air in the motor cover to the outside are formed in the motor cover, the cooling air leadout openings being positioned inward of a peripheral wall part of the motor cover and outward of the inner hole of the cutter housing.