Lawn Mower Blade Assembly Synchronous Rotation
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Solution Overview
Problem
Motor-driven lawn mowers have an unreasonable blade structure, leading to a large load on the motor and low cutting efficiency due to inadequate design, which affects the performance and efficiency of the mowing process.
Innovation Solution
A lawn mower design featuring a blade assembly with a first and second blade, where the swept volume is optimized between 400 cm3 and 8000 cm3, and the blades are positioned to rotate synchronously with a phase angle between 0 and 90 degrees, reducing the load on the motor and enhancing cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the blade structure is optimized with specific swept volume and phase angle, then cutting efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the blade structure by changing key parameters: the swept volume is set between 400-8000 cm³ and the phase angle between 0-90 degrees. These parameter adjustments improve cutting efficiency while maintaining reasonable structural complexity, directly resolving the contradiction between productivity and device complexity.
2Productivity
If the blade assembly design is optimized, then cutting performance is improved, but the load on motor increases
Solution Approach 1:
The patent changes the blade assembly parameters including swept volume (400-8000 cm³) and phase angle (0-90 degrees) to optimize the balance between cutting performance and motor load. The optimized parameters enable effective cutting while controlling the load on the motor within acceptable ranges.
3Productivity
If the swept volume is increased to improve cutting efficiency, then productivity increases, but the mass of blade assembly increases
Solution Approach 1:
The patent optimizes the swept volume parameter within the range of 400-8000 cm³ to achieve the best balance between cutting efficiency and blade assembly mass. This parameter optimization ensures that the blade assembly is lightweight enough for battery-powered operation while maintaining sufficient cutting efficiency.
Data Source
AI summary
A lawn mower includes a blade assembly configured to perform a cutting function, a deck formed with an accommodation space for accommodating at least a portion of the blade assembly, a motor configured to drive the blade assembly to rotate about a rotation axis, and a battery pack configured to power the motor. The blade assembly includes a first cutting portion configured to cut grass and a second cutting portion configured to cut grass. In the direction parallel to the rotation axis, the second cutting portion is located under the first cutting portion. The battery pack includes a battery pack housing and battery cells provided in the battery pack housing.