Vertically Stacked Lawn Mower Blade Assembly to Reduce Motor Load
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Solution Overview
Problem
Motor-driven lawn mowers in the related art have an unreasonable blade structure, leading to a large load on the motor and low cutting efficiency.
Innovation Solution
A blade assembly for lawn mowers with a first cutting portion above a second cutting portion, optimized to reduce motor load and enhance cutting efficiency, featuring a specific rotation diameter, sweep volume, and phase angle, allowing for a smaller motor load and higher cutting efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional blade structure is used in motor-driven lawn mowers, then the cutting function is achieved, but the motor load becomes large and cutting efficiency decreases
Solution Approach 1:
The blade assembly is divided into multiple independent blades (first blade, second blade, third blade, fourth blade) arranged at different heights and angles. Each blade independently cuts grass, distributing the cutting workload and reducing the motor load while maintaining high cutting efficiency through parallel operation of multiple cutting elements
Solution Approach 2:
The patent introduces a vertical dimension to the traditional horizontal blade arrangement by stacking blades at different heights (first blade at highest position, second blade below it, third blade below second, fourth blade at lowest position). This three-dimensional arrangement allows multiple blades to cut grass simultaneously at different levels, significantly improving cutting efficiency without increasing motor load proportionally
2Use of energy by moving object
If the blade assembly rotation diameter and mass are optimized, then energy consumption is reduced and battery life is extended, but cutting performance must be maintained
Solution Approach 1:
The patent optimizes specific parameters including the rotation diameter D (200-700mm), blade mass M (350g-1.8kg), and the product parameter D×N×M (3.5×10^5-7.3×10^7 mm·g) to reduce energy consumption while maintaining cutting performance. These parameter optimizations balance the trade-off between energy efficiency and cutting effectiveness
Solution Approach 2:
The blade assembly is designed with dynamic characteristics including specific moment of inertia (8000-23000 kg·mm²) and rotational speed (2000-6000 rpm) to optimize energy efficiency. The dynamic design allows the blades to maintain cutting performance while reducing energy consumption through optimized rotational dynamics
Data Source
AI summary
A lawn mower includes a blade assembly configured to perform a cutting function. The blade assembly includes an upper blade mounted about a blade rotation axis and an upper blade proximal portion being substantially flat and including a first cutting edge. A lower blade is mounted in overlap with the upper blade about the blade rotation axis. The lower blade includes a lower blade proximal portion positioned outward from the lower blade mounting portion in a radial direction, a lower blade end portion positioned outward from the lower blade proximal portion and below the lower blade proximal portion, and a second cutting edge. A lower blade falling portion transitions from the lower blade proximal portion to the lower blade end portion.