Rearward Engine Lawn Mower Dust Filtering Case Design
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Solution Overview
Problem
Existing lawn mowers with box-shaped dust filtering netting positioned between the driver's seat and radiator face challenges in securing a large intake area, leading to high velocity cooling air that clogs the netting with dust, reducing its effectiveness.
Innovation Solution
A lawn mower design featuring a dust filtering case with a net portion that extends rearwardly beyond the radiator's front surface, increasing the air intake area and reducing air velocity, thereby preventing early clogging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the dust filtering netting is positioned between the driver's seat and radiator with a box-shaped configuration, then the overall length of the vehicle body is reduced, but the air intake area is insufficient causing high air velocity and early clogging
Solution Approach 1:
The dust filtering netting is extended in the longitudinal dimension beyond the front surface of the radiator, transforming from a simple box-shaped configuration to an extended structure that captures cooling air from multiple positions. This dimensional extension increases the air intake area without significantly increasing the overall vehicle body length, thereby resolving the contradiction between compact length and sufficient intake area.
2Device complexity
If the dust filtering netting has a limited air intake area, then the vehicle structure remains compact, but the cooling air velocity increases causing dust to adhere and clog the netting
Solution Approach 1:
By extending the dust filtering netting longitudinally beyond the radiator front surface, the air intake area is increased without adding complex multi-component structures. This simple dimensional extension reduces cooling air velocity by distributing airflow across a larger area, preventing dust adhesion and clogging while maintaining structural simplicity.
3Area of stationary object
If the dust netting is positioned forward of the radiator with extended rearward portions, then the air intake area is increased and air velocity is reduced, but the netting structure becomes more complex
Solution Approach 1:
The dust filtering netting is divided into a box-shaped portion and extended rearward portions, with each segment serving a specific function. The box-shaped portion provides initial filtration while the extended rearward portions capture additional cooling air. This segmentation allows the structure to achieve increased air intake area through simple geometric extension rather than complex three-dimensional configurations.
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 design enhances airflow through the dust netting, reducing the likelihood of clogging and ensuring continuous operation by increasing the air intake area and slowing down cooling air velocity.
Implementation Method 1
a dust filtering case disposed at a forward portion of the hood for allowing ambient cooling air to be drawn into the radiator, the dust filtering case surrounding at least a part of the radiator and having a net portion on at least one side
Data Source
AI summary
A lawn mower comprises: a plurality of wheels; a vehicle body supported by the wheels; a mower unit supported by said vehicle body; a driver's seat supported by said vehicle body; an engine supported by said vehicle body rearwardly of said driver's seat; a radiator disposed between said engine and said driver's seat; a hood for covering said engine; and a dust filtering case disposed at a forward portion of said hood for allowing ambient cooling air to be drawn into said radiator, the dust filtering case surrounding at least a part of the radiator and having a net portion on at least one side thereof, the net portion extending rearwardly beyond a front surface of said radiator.