Lawn Mower Cutting Blade Structure for Reduced Ineffective Load
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Solution Overview
Problem
Existing lawn mower blades face inefficiencies due to high ineffective loads, which affect endurance and mowing performance, making it difficult to optimize overall performance.
Innovation Solution
The cutting blade design includes extension portions with a main body that has symmetrical cross-sections and a balanced load distribution, reducing blade load by ensuring a high ratio of cross-sectional area to equivalent load region, and incorporating a rib for strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the blade strength is increased to meet design requirements, then the blade can withstand higher loads, but the ineffective load of the blade increases, which reduces endurance and mowing performance
Solution Approach 1:
The blade is divided into distinct functional zones: a first extension portion with a first cross-sectional area and a second extension portion with a second cross-sectional area. This segmentation allows different parts of the blade to have different structural characteristics optimized for their specific functions, reducing overall ineffective load while maintaining necessary strength in critical areas.
Solution Approach 2:
Different regions of the blade are given different local qualities through varying cross-sectional areas. The first extension portion has a larger cross-sectional area for enhanced strength where needed, while the second extension portion has a smaller cross-sectional area to reduce ineffective load. This local differentiation optimizes the balance between strength and endurance.
2Strength
If the blade cross-sectional area is increased to maintain strength, then the blade can handle higher stresses, but the ineffective load increases, reducing mowing performance
Solution Approach 1:
The blade structure is segmented into portions with different cross-sectional areas, allowing the design to maintain sufficient strength in critical regions while reducing the cross-sectional area in non-critical regions. This segmentation enables the blade to achieve adequate strength without the penalty of uniformly large cross-sections that would increase ineffective load and reduce mowing performance.
Solution Approach 2:
The blade implements local quality variations by assigning different cross-sectional areas to different extension portions. The first extension portion has a larger cross-sectional area localized where higher strength is needed, while the second extension portion has a smaller cross-sectional area localized where less strength is required, thereby optimizing the balance between strength and mowing performance.
3Ease of manufacture
If the blade design is simplified to reduce manufacturing complexity, then production cost decreases, but the ability to optimize load distribution and reduce ineffective load is limited
Solution Approach 1:
The blade design segments the extension portions into distinct zones with different cross-sectional areas, creating a modular structure that can be manufactured using standard processes. Each segment can be produced independently or as part of a unified blank, allowing for relatively simple manufacturing while achieving optimized load distribution across the different portions.
Solution Approach 2:
The design incorporates local quality variations in the cross-sectional areas of different extension portions, which can be achieved through conventional manufacturing methods such as varying the blank dimensions or using selective material removal. This approach enables optimized load distribution and reduced ineffective load without requiring complex manufacturing processes.
Data Source
AI summary
A cutting blade is capable of being driven to rotate around a first axis. The cutting blade includes cutting portions comprising cutting edges for cutting and extension portions closer to the first axis relative to the cutting portions. Each of the extension portions comprises an upper surface and a lower surface, at least part of the upper surface is a part of a side surface of a first cone with the first axis as an axis, and at least part of the lower surface is a part of a side surface of a second cone with the first axis as an axis.