Electric Lawn Mower Motor Positioning for Compact Multi-Blade Design
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Solution Overview
Problem
Conventional multi-blade mowers with internal combustion engines are large and heavy, limiting their use in compact applications such as ride-on, walk-behind, remote-controlled, and autonomous robotic mowers, and they often require complex and heavy electrical systems.
Innovation Solution
A compact electric mower design with an electric motor positioned between the cutting deck and blade synchronization mechanism, utilizing high-capacity batteries for extended autonomy, and featuring a lightweight, easy-to-maintain construction with reduced wire and connection complexity, along with a synchronization mechanism to prevent blade collisions and facilitate efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multi-blade mowers are equipped with internal combustion engines to provide sufficient power, then cutting capability is improved, but size and weight increase significantly
Solution Approach 1:
The patent replaces the internal combustion engine with an electric motor system. The electric motor is housed in the casing between the cutting plate and blade synchronization mechanism, eliminating the need for a combustion engine while providing sufficient power for multi-blade cutting. This substitution significantly reduces weight while maintaining cutting capability.
Solution Approach 2:
The patent utilizes vertical stacking of cutting blades in multiple tiers, transitioning from horizontal to vertical arrangement. This allows multiple blades to be driven by a single electric motor through a synchronization mechanism, reducing the number of motors needed and thereby reducing overall system weight while maintaining multi-blade cutting power.
2Productivity
If multiple electric motors are used to drive each blade, then cutting performance is improved, but device complexity and wire complexity increase
Solution Approach 1:
The patent merges multiple blade drive functions into a single electric motor. One motor drives a synchronization mechanism that coordinates multiple blades, eliminating the need for separate motors for each blade. This reduces wire complexity and electrical connection complexity while maintaining the productivity benefits of multiple blades.
Solution Approach 2:
The single electric motor performs multiple functions: it directly drives one blade and simultaneously drives the synchronization mechanism that coordinates all other blades. This multi-functional approach reduces the number of electrical components and simplifies the overall electrical system while maintaining cutting efficiency.
3Productivity
If conventional multi-blade mowers are designed with large cutting widths, then productivity is improved, but maneuverability and adaptability to compact applications deteriorate
Solution Approach 1:
The patent arranges cutting blades in vertical tiers stacked above each other, creating a multi-level cutting structure. This vertical arrangement enables a large effective cutting width without increasing the horizontal footprint of the mower, improving maneuverability while maintaining productivity.
Solution Approach 2:
The cutting system is segmented into multiple independent blade tiers, each capable of operating independently. This segmentation allows the mower to maintain a compact horizontal design for better maneuverability while achieving large cutting width through vertical stacking of cutting elements.
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
Enables a compact, lightweight mower with a cutting width greater than 60 cm, suitable for various applications, including ride-on and autonomous configurations, while ensuring reliability and durability through efficient energy management and simplified maintenance.
Implementation Method 1
an electric motor for driving the blades is located in the housing
Implementation Method 2
utilizing high-capacity batteries for extended autonomy
Data Source
Figure 1
Figure 2~3
Figure 4A~4C
AI summary
The invention relates to an electric mower which comprises a cutting unit (20) with: a cutting plate (24) provided with at least two cutting blades (46) mounted respectively on blade shafts (42, 44); a casing (32) attached to the cutting plate; at least one electric motor (60) driving the cutting blades; and a blade-synchronisation mechanism (70). According to the invention, the electric motor (60) is arranged in the casing (32) between the cutting plate (46) and the blade-synchronisation mechanism (70).