Wheel Clutch Unlocking for Hand-Propelled Self-Driving Machines
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Solution Overview
Problem
Conventional hand-propelled, self-driving traveling machines face difficulties in efficiently disconnecting the transmission between the wheel and motor shaft, leading to a 'lock-up' issue when the motor stops, requiring significant user force to pull the machine backward and causing inconvenience.
Innovation Solution
The design incorporates a clutch system with a movable pin and friction members that allows for automatic unlocking by reversing the motor shaft rotation, ensuring the clutch remains in an unlocked state even when the motor stops, preventing the wheel from driving the motor shaft and allowing free rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional clutch is used to allow asynchronous rotation of left and right wheels, then the machine can take turns, but the clutch cannot disconnect transmission when the motor stops and the user pulls the machine backward, causing a lock-up
Solution Approach 1:
The clutch mechanism is designed to automatically disconnect when the transmission shaft rotates in reverse direction. Instead of requiring user force to overcome engaged friction members, the reverse rotation inherently causes the movable pin to shift and disengage the friction members, enabling easy backward pulling without lock-up
2Power
If the clutch remains engaged to drive the wheel, then power transmission is efficient, but the user cannot pull the machine backward freely without exerting large force
Solution Approach 1:
The clutch mechanism dynamically transitions between engaged and disengaged states based on rotation direction. During forward motion, friction members are pressed together for efficient power transmission. During backward pulling, reverse rotation automatically disengages the friction members, reducing required user force
3Ease of operation
If the movable pin is designed to move between locked and unlocked positions, then the clutch can disconnect transmission, but the pin may tip over causing reliability failure
Solution Approach 1:
The limiting slot acts as an intermediary guide structure that constrains the movable pin's movement path. The slot's geometry prevents the pin from tipping over by providing lateral guidance and support, ensuring reliable operation during position transitions
4Extent of automation
If friction members are used to engage and disengage the clutch, then automatic unlocking is achieved, but noise is generated during operation
Solution Approach 1:
The friction members are designed with gradual engagement and disengagement characteristics that cushion the transition process. By controlling the rate of contact and separation, the design minimizes impact noise while maintaining automatic unlocking functionality
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
This solution enhances the reliability of the clutch system, preventing failure due to tipping and maintaining the unlocked state through frictional forces, reducing the effort required to manage the machine and minimizing noise during operation.
Implementation Method 1
a fixed friction member, fixed to the chassis or constituting a part of the chassis, where the fixed friction member is in a frictional contact with the movable friction member
Data Source
AI summary
A hand-propelled, self-driving, traveling machine that includes a clutch which enables transmission between a wheel and a transmission shaft. The clutch provides a drive state in which the transmission shaft drives the wheel to rotate and an unlocked state in which the wheel is rotatable relative to the transmission shaft. The clutch includes a driving member, combined with the transmission shaft, a movable pin, movable between a locked position in which the clutch is in the drive state and an unlocked position in which the clutch is in the unlocked state, a transmission member connected to the wheel, a movable friction member provided with a limiting slot, where the movable pin is partially disposed in the limiting slot, and a fixed friction member that is fixed to the chassis and that is in a frictional contact with the movable friction member.