Stand-On Mower Drive Wheel Torque for Stable Uphill Mobility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing stand-on mowers face challenges in providing sufficient traction and stability when operating on slopes, particularly when moving uphill, due to insufficient driving force and weight distribution.
Innovation Solution
The stand-on mower is equipped with a walking assembly comprising at least two drive wheels driven by walking electric motors, a power supply that outputs torque to drive the mower, and a cutting assembly powered by a mowing element, with torque and power ratios optimized for stability and uphill mobility, along with features like a transmission assembly and adjustable damping systems for enhanced control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the walking assembly is equipped with high-torque drive wheels and walking electric motors, then the driving force and uphill stability are improved, but the device complexity and weight increase
Solution Approach 1:
The walking assembly is divided into independent drive wheels, each equipped with its own walking electric motor. This segmentation allows each motor to independently control torque to the ground, improving uphill stability and traction without requiring a single complex high-power motor system
Solution Approach 2:
The patent specifies that the ratio of maximum output torque of a single drive wheel to the unladen weight of the stand-on mower is greater than or equal to 1.2 N·m/kg. This parameter optimization ensures sufficient driving force for slope operation while avoiding excessive motor sizing that would increase overall system complexity
2Force
If the power supply outputs high torque to drive wheels, then uphill mobility is improved, but the energy consumption increases
Solution Approach 1:
The patent optimizes the torque-to-weight ratio parameter to be ≥1.2 N·m/kg, which provides sufficient torque for uphill operation without excessive energy consumption. This parameter optimization balances driving performance with energy efficiency
Solution Approach 2:
The independent wheel motors can independently regulate their torque output based on actual operating conditions, allowing the system to consume only the necessary energy for current terrain requirements rather than continuously operating at maximum torque
3Stability of the object's composition
If the stand-on mower is designed for stable uphill movement, then the traction is improved, but the device complexity increases
Solution Approach 1:
The walking assembly uses multiple independently motorized drive wheels instead of a single complex differential system. Each wheel can independently adjust torque, providing stable uphill movement through distributed traction control
Solution Approach 2:
The patent specifies the torque-to-weight ratio should be ≥1.2 N·m/kg, which ensures sufficient traction for stable uphill operation without requiring overly complex mechanical systems
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 ensures stable uphill movement on slopes of up to 20° with minimal deviation, providing strong driving force and improved traction, while maintaining operational efficiency and safety.
Implementation Method 1
at least two walking electric motors drive the at least two drive wheels one to one
Implementation Method 2
a walking assembly of the stand-on mower is required to provide sufficient traction so that the stand-on mower can overcome the gravity
Implementation Method 3
a power supply configured to power at least the walking assembly to enable the at least two drive wheels to output torque
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A stand-on mower (100) includes a foot pedal (61) for a user to stand on; a walking assembly (40) including at least two drive wheels (411L, 411R) and at least two walking electric motors (42L, 42R), where the at least two walking electric motors (42L, 42R) drive the at least two drive wheels (411L, 411R) one to one; and a power supply (20) configured to power at least the walking assembly (40) to enable the at least two drive wheels (411L, 411R) to output torque to drive the stand-on mower (100) to walk and further configured to power at least a cutting assembly (80) to enable a mowing element to cut vegetation. The ratio of maximum output torque of a single drive wheel (411) to an unladen weight of the stand-on mower (100) is greater than or equal to 1.2 N·m/kg.