Lawn Edger Carbon-Fiber Structure for High Power Density
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Solution Overview
Problem
Existing lawn edgers have low performance and are heavy, making them difficult to handle and causing user fatigue during operation.
Innovation Solution
A lawn edger with an electric motor that achieves a power-to-weight ratio of at least 180 W/kg, utilizing a high-power, lightweight design with a carbon fiber tube and efficient power transmission, including a flexible shaft and vibration-reducing bending, along with a wireless communication system and brake protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the whole machine is made bigger and heavier to improve performance, then the output power is improved, but the weight increases making the machine difficult to handle
Solution Approach 1:
The patent employs a carbon fiber tube as the protective casing material, which provides high strength and rigidity while maintaining extremely low weight. This composite material approach allows the machine to achieve improved performance without increasing overall weight, directly resolving the contradiction between power output and weight.
Solution Approach 2:
The patent achieves a power-to-weight ratio of at least 180 W/kg by optimizing the electric motor parameters and overall machine configuration. This parameter optimization allows the machine to deliver high output power while maintaining a lightweight design, effectively resolving the contradiction between power and weight.
2Ease of operation
If the machine is made lighter to improve ease of operation, then the weight is reduced, but the output power may be compromised
Solution Approach 1:
The carbon fiber tube provides structural integrity and protection for internal components while being extremely lightweight. This allows the machine to maintain high ease of operation with reduced weight while still housing powerful components that deliver sufficient output power.
Solution Approach 2:
By achieving a power-to-weight ratio of at least 180 W/kg, the patent ensures that even though the machine is lightweight for ease of operation, it still delivers adequate output power through optimized motor performance and efficient power transmission.
3Length of moving object
If a long rod assembly is used to connect the working head to the operation assembly, then the operational reach is improved, but the machine becomes heavier and more difficult to handle
Solution Approach 1:
The carbon fiber tube serves as both the protective casing and the structural element providing operational reach. This composite material allows the machine to maintain a long operational reach while keeping the overall weight low, resolving the contradiction between length and weight.
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 improves machine performance by maintaining a light weight while enhancing power density, reducing user fatigue, and providing operational convenience through efficient power transmission and safety features.
Implementation Method 1
an electric motor, wherein the electric motor drives the output shaft to rotate
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A lawn edger includes an output shaft, a shield, a front housing, a rear housing, an electric motor, a connection assembly, and a transmission assembly. The output shaft is used for mounting a blade for cutting grass. The front housing accommodates at least part of the output shaft. The rear housing is formed with a coupling portion for coupling a battery pack. The electric motor is mounted in the rear housing to drive the output shaft. The connection assembly is used for connecting the front housing to the rear housing. The transmission assembly is used for transmitting power between the electric motor and the output shaft. When the electric motor is in a maximum-efficiency state, the ratio of output power of the electric motor to the weight of the lawn edger is greater than or equal to 180 W/kg.