Garden Tool Independent Front and Rear Wheel Drive Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing garden tools with lithium battery power face issues with insufficient walking power on uneven ground and inability to move backward, leading to slipping and difficulty in maneuvering at dead corners.
Innovation Solution
A garden tool with a traveling assembly featuring a front-wheel and rear-wheel drive mechanism, controlled by a speed regulating switch that allows forward and backward movement, equipped with a control assembly to manage rotational speed and an alarm system to ensure smooth transitions and prevent overloading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the garden tool uses a self-propelled mechanism on the rear wheel axle, then the structure is simple, but the tool slips on uneven ground and cannot move backward
Solution Approach 1:
The drive mechanism is segmented into independent front and rear wheel drive systems, each with its own motor. This allows each wheel to operate independently, improving traction on uneven ground while enabling backward movement through coordinated operation of both drive systems.
Solution Approach 2:
The front and rear wheel drive mechanisms are designed with identical structures, allowing them to perform multiple functions: forward movement, backward movement, and independent traction control. This universal design enables the tool to handle various terrain conditions and movement directions.
2Ease of operation
If the speed regulating switch transitions from forward to backward position, then the movement direction changes, but the motor may overload during direction reversal
Solution Approach 1:
When the speed regulating switch transitions from forward to backward position, the control assembly automatically stops the motor for a preset time before activating it in the reverse direction. This preliminary stopping action prevents current surges and overloading during direction reversal, protecting the motor while enabling smooth direction changes.
Solution Approach 2:
The control assembly monitors the position of the speed regulating switch and provides feedback control to the motor. When direction reversal is detected, the system automatically adjusts the motor operation by implementing a stopping period, ensuring reliable operation while maintaining ease of direction switching.
3Use of energy by moving object
If the garden tool uses lithium battery power, then the energy efficiency is improved, but the motor torque is insufficient to drive both the main blade and walking wheel simultaneously
Solution Approach 1:
The power transmission system is segmented into independent drive paths for the main blade and walking wheels, with the motor capable of selectively powering either component. This segmentation allows the limited torque from the lithium battery-powered motor to be effectively allocated to either blade operation or wheel drive as needed.
Solution Approach 2:
The drive system is designed to dynamically switch between different operational modes: blade-only operation, walking wheel-only operation, and coordinated operation. This dynamic flexibility allows the motor to optimize torque distribution based on real-time operational requirements, maximizing the utility of the limited power available from the lithium battery.
Data Source
Figure 1
Figure 2
Figure 3
AI summary
The invention provides a garden tool (100), which comprises a traveling assembly (20), a travel-driving assembly (30) and a control assembly (40). The traveling assembly (20) comprises a front wheel (21) and a rear wheel (23). The travel-driving assembly (20) comprises a front-drive mechanism (31) for driving the front wheel (21) and a rear-drive mechanism (32) for driving the rear wheel (23). The control assembly (40) controls the operation of the front-drive mechanism (31) and the rear-drive mechanism (32), so as to enable the front wheel (21) and the rear wheel (23) to respectively move forward or backward under the action of the front-drive mechanism (31) and the rear-drive mechanism (32). Compared with the prior art, the garden tool drives the front wheels (21) and the rear wheels (23) to move forward or backward respectively through the front-drive mechanism (31) and the rear-drive mechanism (32), and thus not only does the garden tool automatically walk backwards, but also the traveling assembly (20) can be ensured to obtain sufficient power, thereby the garden tool is prevented from slipping when climbing and retreating.