Stand-On Mower Multi-Motor Drive for Stable Slope Traction

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Solution Overview

Problem

Existing stand-on mowers face challenges in providing sufficient traction and stability when operating on slopes due to their weight, leading to potential slipping and loss of control.

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 traction, along with a transmission assembly for torque conversion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the stand-on mower uses conventional drive systems, then the device complexity is low, but the traction and stability on slopes are insufficient

Engineering Contradiction:

Improvetraction and stability on slopesVSAvoiddrive system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The drive system is segmented into multiple independent drive wheels (at least two), with each wheel capable of being driven independently by separate walking electric motors. This segmentation allows for better weight distribution and traction control on slopes, as each wheel can independently engage with the ground surface.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The conventional mechanical drive system is replaced with walking electric motors that directly drive the wheels. This substitution provides more precise torque control and better adaptability to varying terrain conditions, improving reliability on slopes while maintaining reasonable system complexity through direct-drive architecture.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If the stand-on mower increases its weight to improve stability, then the stability improves, but the traction on slopes deteriorates due to inability to overcome gravity

Engineering Contradiction:

ImprovestabilityVSAvoidtraction on slopes

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The system changes the parameter of torque output from the walking electric motors to compensate for the effects of weight. By providing sufficient torque (ratio of maximum output torque of a single drive wheel to unladen weight ≥ 1.2 N·m/kg), the system enables the mower to overcome gravity on slopes without requiring excessive weight, thus maintaining both stability and traction.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The walking electric motors are designed to provide preliminary torque before the mower encounters steep slopes. This preliminary torque generation ensures that the drive wheels have sufficient grip and force储备 to tackle inclines effectively, preventing slipping before it occurs.

Inventive Principle:

Principle #10Preliminary action

3Reliability

If the stand-on mower uses higher power output to improve uphill capability, then the traction and uphill performance improve, but the power consumption increases

Engineering Contradiction:

Improveuphill capabilityVSAvoidpower consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The system uses multiple walking electric motors that can operate at partial capacity under normal conditions, consuming less energy. When uphill capability is needed, the motors can provide excessive torque temporarily (ratio ≥ 1.2 N·m/kg) to overcome gravity, then return to partial operation, optimizing the balance between performance and energy consumption.

Inventive Principle:

Principle #16Partial or excessive action

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 and improved traction on slopes, maintaining stability and control even at inclines of up to 20°, with enhanced power and torque distribution for efficient mowing performance.

Implementation Method 1

the walking assembly includes at least two drive wheels and at least two walking electric motors, and the at least two walking electric motors drive the at least two drive wheels one to one

Methodology Applied

Scientific EffectElectromagnetic conversion: Electromagnetic Induction

Implementation Method 2

a walking assembly supporting the body portion and configured to drive the stand-on mower to walk... configured to provide sufficient traction so that the stand-on mower can overcome the gravity

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20250331451A1Stand-on mower

Publication Date: 2025.10.30 NANJING CHERVON IND

AI summary

A stand-on mower includes a foot pedal for a user to stand on; a walking assembly including at least two drive wheels and at least two walking electric motors, where the at least two walking electric motors drive the at least two drive wheels one to one; and a power supply configured to power at least the walking assembly to enable the at least two drive wheels to output torque to drive the stand-on mower to walk and further configured to power at least a cutting assembly to enable a mowing element to cut vegetation. The ratio of maximum output torque of a single drive wheel to an unladen weight of the stand-on mower is greater than or equal to 1.2 N·m/kg.