Dual Blade Assembly for Lower Motor Load and Efficient Mowing
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Solution Overview
Problem
Motor-driven lawn mowers suffer from an unreasonable blade structure, leading to high motor load and low cutting efficiency.
Innovation Solution
A dual blade assembly design with a first cutting portion above and a second cutting portion below, optimized for a specific rotation diameter and sweep volume, along with a battery pack configuration to ensure a balanced load and efficient power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional single blade structure is used, then the blade assembly is simple, but the motor load is high and cutting efficiency is low
Solution Approach 1:
The blade assembly is segmented into a first blade and a second blade positioned at different heights, with each blade having independent cutting portions. This segmentation allows the cutting function to be distributed across multiple elements, reducing the load on the motor while maintaining or improving cutting efficiency through coordinated operation of multiple cutting surfaces
2Productivity
If the blade assembly mass is increased to improve cutting performance, then cutting efficiency improves, but motor load increases
Solution Approach 1:
Instead of using one heavy blade, the cutting function is segmented into two lighter blades working in coordination. The first blade and second blade share the cutting load, allowing the system to achieve high cutting efficiency without requiring excessive mass in any single blade component
Solution Approach 2:
The blade assembly extends in the vertical dimension with blades positioned at different heights above the cutting surface. This three-dimensional arrangement allows multiple cutting portions to engage grass at different levels simultaneously, improving cutting efficiency without increasing the horizontal footprint or excessive mass
3Productivity
If the rotation diameter is increased to improve cutting coverage, then cutting efficiency improves, but the product of rotation diameter, battery cells, and blade mass increases
Solution Approach 1:
The cutting coverage is achieved through segmented blades with multiple cutting portions distributed around the rotation path. Each cutting portion contributes to the overall coverage area, allowing effective cutting with a moderate rotation diameter rather than requiring a large single blade
Solution Approach 2:
The patent specifies an optimized rotation diameter range (200-700mm) and controls the product of rotation diameter, battery cells, and blade mass within a specific range. This parameter optimization ensures adequate cutting coverage while maintaining energy efficiency and balancing the load on the battery-powered motor system
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 design achieves a smaller motor load and higher cutting efficiency, with extended battery life and improved cutting performance.
Implementation Method 1
a battery pack configured to provide power source for the motor. The battery pack includes a battery pack housing and battery cells provided in the battery pack housing
Implementation Method 2
a motor configured to drive the blade assembly to rotate about a rotation axis
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 below the first cutting portion. The battery pack includes a battery pack housing and battery cells provided in the battery pack housing.