Lawn Mower Wheel Drive with Centrifugal Auto-Walking Clutch
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Solution Overview
Problem
Conventional lawn mowers with battery power systems are labor-intensive and have low work efficiency due to the need for manual pushing or pulling, especially on lawns with gradients.
Innovation Solution
A garden tool power system with an automatic walking function, comprising a motor, reducer, and transmission shaft, where the motor drives wheels through a pinion and gear mechanism, utilizing centrifugal blocks and springs to enable self-propelling and manual operation modes, allowing for efficient switching between automatic and manual walking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a battery-powered lawn mower is used, then working noise is reduced and energy conservation is achieved, but work efficiency decreases and labor intensity increases due to manual pushing or pulling
Solution Approach 1:
The patent applies dynamics by making the transmission system adaptable between two states: engaged state for automatic walking (motor powered) and disengaged state for manual pushing. The clutch mechanism dynamically connects or disconnects the motor's transmission shaft from the wheel drive, allowing the lawn mower to switch between self-propelled mode and manual mode, thereby resolving the contradiction between low noise/battery power and work efficiency.
Solution Approach 2:
The patent implements multi-functionality by designing a transmission system that can perform dual functions: automatic self-propelled walking when the motor is engaged, and manual pushing when disengaged. This universal transmission mechanism allows the same device to adapt to different working conditions (flat lawns vs. sloped lawns), improving overall productivity while maintaining the benefits of battery power.
2Use of energy by moving object
If a battery-powered lawn mower is used, then energy conservation is achieved, but labor intensity increases due to manual pushing or pulling especially on lawns with gradients
Solution Approach 1:
The dynamic clutch mechanism allows the operator to engage motor power when needed (on sloped or difficult lawns) and disengage for manual pushing on flat areas, optimizing the balance between energy conservation and ease of operation. This dynamic adaptability reduces labor intensity on gradients while maintaining energy efficiency overall.
Solution Approach 2:
The self-propelled automatic walking function allows the lawn mower to propel itself using the motor's power, eliminating the need for the operator to manually push or pull the heavy device, especially on sloped lawns. This self-service capability significantly reduces labor intensity while the battery-powered motor maintains energy conservation.
3Productivity
If an automatic walking function is added to the lawn mower, then work efficiency is improved, but device complexity increases
Solution Approach 1:
The patent uses a clutch mechanism as an intermediary component that simply engages or disengages the transmission shaft from the wheel drive. This intermediary device adds minimal complexity while enabling the automatic walking function, as it only requires basic clutch components (clutch plate, spring, actuator) rather than a completely complex transmission system.
Solution Approach 2:
The transmission system is segmented into separable components: the motor's transmission shaft, the clutch mechanism, and the wheel drive. This segmentation allows the automatic walking function to be added as a modular component rather than redesigning the entire system, thereby limiting the increase in device complexity while achieving improved work efficiency.
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
Enhances work efficiency by enabling automatic walking when the motor is operational and allowing manual operation when stopped, while reducing manufacturing costs with a simple reducer structure.
Implementation Method 1
Each guiding rod has a spring surrounded therearound and each of the springs is located between the two centrifugal blocks and has two opposite ends respectively abutted against a corresponding portion of the centrifugal blocks
Implementation Method 2
two centrifugal blocks located between the guiding rods
Data Source
AI summary
A garden tool power system comprises a motor, a reducer and a transmission shaft. The motor transmits the power to the transmission shaft through the reducer to drive wheels on the transmission shaft. The reducer comprises a pinion connected to an output end of the motor and a gear engaged with the pinion. The transmission shaft includes left and right shafts connected with each other through a connecting shaft. The gear mounted on the connecting shaft has at least two guiding rods transversely located thereon and two centrifugal blocks located between the guiding rods. Each guiding rod has a spring surrounded therearound and each spring located between two centrifugal blocks has two opposite ends respectively abutted against the corresponding portions of the centrifugal blocks. A fixing sleeve provided on the periphery of the centrifugal blocks is mounted on the transmission shaft and has buckle structures matching with the centrifugal blocks.