Lawn Mower Blade Lifting Geometry for Flattened Grass Discharge
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Solution Overview
Problem
Existing lawn mower blades fail to efficiently lift and cut flattened grass while creating a favorable air flow for upward discharge of cut grass clippings, leading to inefficiencies and potential clogging.
Innovation Solution
A blade design featuring a convex center part, curved sides, a blade body with a sharp edge, and a lifting part that creates a whirling wind to lift and discharge grass efficiently, with a symmetrical shape and controlled bending to optimize airflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional blade design is used, then the structure is simple, but the blade cannot efficiently lift flattened grass and create favorable airflow for upward discharge of cut grass
Solution Approach 1:
The blade is divided into distinct functional segments: a cutting edge portion, a lifting portion with upward curvature, and a discharge portion. Each segment performs a specific function - the cutting edge cuts grass, the lifting portion generates airflow to lift flattened grass, and the discharge portion directs cut grass upward. This segmentation allows the blade to simultaneously perform multiple functions without excessive overall complexity.
Solution Approach 2:
Different portions of the blade have different local geometries optimized for their specific functions. The lifting portion has an upward curvature and specific angle to generate effective airflow, while the discharge portion has a different orientation to direct grass upward. The cutting edge has a sharp, flat surface for efficient cutting. This local optimization of geometry at each functional zone maximizes performance while maintaining a relatively simple overall structure.
2Ease of operation
If the blade lifts flattened grass effectively, then cut grass can be discharged upward efficiently, but the blade design becomes more complex
Solution Approach 1:
The lifting portion of the blade features an upward curvature that is essential for generating airflow to lift flattened grass. The curved surface creates a pressure differential that draws air and grass upward. This curvature is a simple geometric feature that can be formed in standard blade manufacturing processes, adding functionality without significant complexity.
Solution Approach 2:
The blade exhibits asymmetric geometry in its lifting and discharge portions, with the lifting portion having a specific upward angle and the discharge portion oriented differently to direct grass upward. This asymmetric design optimizes airflow patterns and grass discharge efficiency. The asymmetry is incorporated through straightforward geometric shaping that does not require complex manufacturing processes.
3Productivity
If the blade creates strong whirling wind for grass discharge, then cut grass is discharged efficiently, but the blade structure becomes more complex
Solution Approach 1:
The lifting portion of the blade is designed to create dynamic whirling airflow during rotation. The upward curvature and specific geometry cause air to swirl around the blade, generating a vortex effect that effectively lifts and discharges cut grass. This dynamic airflow pattern is achieved through simple geometric design rather than complex mechanical structures, as the whirling effect is a natural result of the blade's shape and rotation.
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 blade effectively lifts flattened grass vertically and discharges cut grass upwards, enhancing mowing efficiency by preventing clogging and ensuring clean ejection of clippings.
Implementation Method 1
a lifting part formed by bending or folding a portion of the blade body to protrude to a certain height and create whirling wind
Data Source
AI summary
A lawn mower blade includes: a convex center part with a central hole formed where a bolt can be fastened from below; a curved part formed on both sides of the convex center part and bent downward; a blade body extending from both sides of the curved part; a side edge formed on the blade body with a sharp surface for cutting grass; and a lifting part formed by bending or folding a portion of the blade body to protrude to a certain height and create whirling wind.