Wheel Drive Clutch Control Using Motor Reverse Shutdown

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Solution Overview

Problem

The clutch in existing hand-propelled working machines, such as snow throwers, cannot be effectively shut down and tripped when the user pushes or rotates the wheels, leading to potential damage and reduced reliability.

Innovation Solution

A controller is used to control the motor's rotational speed to a negative speed, reversing its rotation to automatically unlock the clutch, thereby ensuring reliable shutdown and trip of the clutch.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the clutch is designed to be manually unlocked by rotating wheels, then the structure remains simple, but the clutch fails to unlock reliably when the user pushes and pulls the wheels

Engineering Contradiction:

Improveclutch shutdown reliabilityVSAvoidmanual wheel rotation requirement

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the manual mechanical operation of rotating wheels to unlock the clutch with an automated motor-driven system. The motor rotates in reverse to automatically drive the clutch to the unlocked state, eliminating the need for manual wheel rotation and ensuring reliable clutch shutdown.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

Instead of using forward rotation to engage the clutch, the patent employs reverse rotation of the motor to disengage and unlock the clutch. This inversion of the rotation direction enables automatic unlocking without requiring manual intervention to rotate the wheels.

Inventive Principle:

Principle #13The other way round (Inversion)

2Strength

If the clutch remains locked when the motor stops, then power transmission is maintained, but reverse torque damages parts and reduces service life

Engineering Contradiction:

Improvepart durabilityVSAvoidclutch unlock function

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The patent performs preliminary action by automatically unlocking the clutch before the motor fully stops or when reverse torque might occur. The controller detects the stop condition and initiates reverse rotation to disengage the clutch, preventing reverse torque from damaging the parts.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The controller uses feedback from the motor's operational state to determine when to unlock the clutch. By monitoring the motor stop condition, the controller automatically activates reverse rotation to disengage the clutch, preventing damage from reverse torque and extending part service life.

Inventive Principle:

Principle #23Feedback

Data Source

PatentEP4364551B1Hand-propelled working machine

Publication Date: 2025.09.10 NANJING CHERVON IND

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AI summary

Provided is a hand-propelled working machine including a body; a traveling wheel group including wheels; a motor including a motor shaft for driving wheels to rotate; a controller; a transmission mechanism for implementing transmission between the motor shaft and the wheels and having a first state and a second state, where when the transmission mechanism is in the second state, the wheels are rotatable freely relative to the motor shaft; and an operation member operated to have at least a first operation state for controlling the motor to start and a second operation state for controlling the motor to stop; where when the operation member is switched from the first operation state to the second operation state, a target rotational speed of the motor is set to a first rotational speed so that the transmission mechanism is switched from the first state to the second state, where the first rotational speed is a negative rotational speed. The negative rotational speed is applied to the motor, achieving the shutdown and trip of the motor and a clutch and high trip reliability.