String-like Resin Rotary Cutters for Low-Noise Mowing
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Solution Overview
Problem
Conventional mowers driven by engines generate loud noise and high energy consumption due to metal blades rotating at high speeds, which is undesirable in electric work machines aimed at reducing environmental impact.
Innovation Solution
A mower equipped with string-like resin rotary cutters that rotate about a vertical axis, reducing noise and energy consumption, and featuring a wavy peripheral wall to enhance mowing efficiency and prevent grass escape during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If metal blades rotate at high speed to perform mowing work, then cutting performance is improved, but noise increases and energy consumption increases
Solution Approach 1:
The patent changes the material parameter of the rotary cutter from metal to resin, and changes the shape parameter from blade-like to string-like. This transforms the cutting mechanism from high-speed blade rotation to slower string rotation, fundamentally altering how cutting is achieved and eliminating wind noise generation while maintaining cutting effectiveness
Solution Approach 2:
The patent uses resin material for the rotary cutter instead of traditional metal blades. This material substitution enables the cutter to rotate at lower speeds without generating excessive noise, while still providing sufficient cutting force through the string-like configuration and resin material properties
2Productivity
If metal blades rotate at high speed to perform mowing work, then cutting performance is improved, but energy consumption increases
Solution Approach 1:
The patent changes the rotational speed parameter from high speed to low speed, and changes the material parameter from metal to resin. This combination reduces the kinetic energy required for rotation while maintaining cutting effectiveness through the string-like configuration, thereby reducing overall energy consumption
Solution Approach 2:
Using resin material for the rotary cutter reduces the mass compared to metal blades, which decreases the moment of inertia and the energy required to rotate the cutter at operational speeds, thereby reducing energy consumption while maintaining cutting performance
3Object-generated harmful factors
If string-like resin rotary cutters are used to reduce noise and energy consumption, then noise and energy consumption are reduced, but cutting effectiveness may be compromised
Solution Approach 1:
The patent divides the rotary cutter into multiple string-like elements instead of using a single solid blade. This segmentation allows each string to rotate independently at lower speeds, reducing noise while collectively providing sufficient cutting force through the cumulative effect of multiple cutting elements
Solution Approach 2:
The string-like rotary cutters have a curved, flexible configuration that allows them to bend and conform to the grass profile during rotation. This curvature enables the strings to maintain contact with the grass surface throughout the rotation cycle, ensuring effective cutting despite the lower rotational speeds and flexible material
Data Source
AI summary
A mower mounted to a travel machine body includes a mower deck that is open downward and at least one rotary cutter located inside the mower deck and configured to rotate about a vertical axis, the at least one rotary cutter being a string-like resin member.