Lawn Mower Housing Protrusions for Grass Cutting Efficiency
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Solution Overview
Problem
Existing lawn mowers are not effectively designed to cut lawn grass, particularly in terms of efficiency and finish, due to limitations in blade design and interaction with the housing.
Innovation Solution
A lawn mower with a cutter blade system that includes a rotation shaft, overlapping blade members, and a housing with protrusions that guide and cut grass efficiently, featuring a peripheral wall with protrusions that facilitate cutting and reduce debris accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the cutter blade is designed with cutting portions facing the peripheral wall, then grass cutting efficiency is improved, but debris accumulation occurs between the blade and housing
Solution Approach 1:
The peripheral wall is segmented by adding protrusions that divide the space between the cutter blade and housing into multiple zones. This segmentation prevents continuous debris accumulation by creating discharge pathways through the gaps between protrusions, while maintaining the cutting efficiency provided by the cutting portions facing the peripheral wall.
Solution Approach 2:
The protrusions act as intermediary structures between the cutter blade and the housing peripheral wall. They mediate the interaction by providing both cutting assistance (through cutting portions on their surfaces) and debris management (through gaps that allow debris discharge), resolving the contradiction between cutting efficiency and debris accumulation.
2Object-generated harmful factors
If the peripheral wall is designed with protrusions, then debris accumulation is reduced, but device complexity increases
Solution Approach 1:
The protrusions are designed to serve multiple functions simultaneously: they assist in cutting grass (cutting portions on protrusion surfaces), guide debris flow (through their positioning), and enable debris discharge (through gaps between protrusions). This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while effectively reducing debris accumulation.
3Productivity
If cutting portions are provided at all portions of the cutter blade, then grass cutting efficiency is maximized, but the risk of debris accumulation increases
Solution Approach 1:
Instead of uniformly distributing cutting portions across the entire cutter blade, the invention applies cutting portions selectively at specific locations that face the peripheral wall. This local quality approach maintains cutting efficiency where needed while avoiding areas where debris accumulation would occur, and the protrusions further enhance this by providing localized cutting assistance and debris discharge pathways.
Data Source
AI summary
A lawn mower according to the present invention includes: a drive source provided with a rotation shaft; a cutter blade extending in a direction intersecting the rotation shaft; and a housing provided with a peripheral wall surrounding the cutter blade. The cutter blade is provided with a cutting portion, the cutting portion being provided at least at a portion of the cutter blade that faces the peripheral wall, and the peripheral wall is provided with protrusions protruding toward the rotation shaft from a surface of the peripheral wall that faces the direction of the rotation shaft.