Composite Mower Blade Cover for Impact and Wear Resistance
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Solution Overview
Problem
The existing mowers with chassis made of high-impact polypropylene (HIPP) suffer from insufficient rigidity, poor wear and impact resistance, and lack aesthetic appeal, failing to meet the increasing demands for improved mechanical performance and rotational speed of mowing blades.
Innovation Solution
The mower chassis and blade covers are made of a composite material comprising amorphous and crystalline plastics, such as a PC-PBT blend, enhancing impact resistance, wear resistance, and aesthetic appeal while maintaining rigidity and reducing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the chassis is made of high-impact polypropylene (HIPP), then the manufacturing cost is low and ease of manufacture is good, but the overall rigidity is insufficient, wear resistance and impact resistance are poor
Solution Approach 1:
The patent applies composite materials by combining amorphous plastic (providing toughness and impact resistance) with crystalline plastic (providing rigidity and wear resistance). This composite structure resolves the contradiction by achieving both high impact resistance and good rigidity while maintaining manufacturability through injection molding processes.
2Ease of manufacture
If the chassis is made of high-impact polypropylene (HIPP), then the manufacturing cost is low, but the surface gloss is moderate and aesthetic appeal is poor
Solution Approach 1:
The composite material system allows for superior surface finish properties while maintaining cost-effective manufacturing. The crystalline plastic component provides natural surface gloss and aesthetic appeal, resolving the contradiction between manufacturing cost and surface quality.
3Strength
If the blade cover is made of composite material with amorphous and crystalline plastic, then the impact resistance strength is greater than or equal to 50 MPa and wear resistance is improved, but the material complexity increases
Solution Approach 1:
The patent uses a two-component composite material system (amorphous plastic and crystalline plastic) that achieves high impact resistance (≥50 MPa) and improved wear resistance. While the material composition is more complex than single-material systems, the manufacturing process remains relatively simple through standard injection molding techniques.
Data Source
AI summary
A mower includes an operating assembly and a body. The operating assembly includes an operating portion for a user to operate. The body includes a traveling assembly and a cutting assembly. The cutting assembly includes a cutting blade and a blade cover, and the blade cover is formed with an accommodation portion for accommodating the cutting blade. The blade cover is made of a composite material, and the composite material includes at least an amorphous plastic and a crystalline plastic. The impact resistance strength of the blade cover is greater than or equal to 50 MPa.