Friction Wheel Drive Adaptive Pressing Force
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Solution Overview
Problem
Friction wheel drives face inefficiency and excessive wear due to the need for high contact pressing forces to transmit maximum drive forces without excessive slip, which is not directionally adaptable.
Innovation Solution
The contact pressing force of the driving roller is automatically adjusted based on the driving force or torque to be transmitted, using mechanical coupling members and pivot levers to maintain acceptable slip and reduce unnecessary pressing forces, ensuring efficient force transmission in both directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact pressing force is set high to transmit maximum drive forces without excessive slip, then the drive force transmission is improved, but wear increases and efficiency decreases
Solution Approach 1:
The pressing force is made dynamic rather than static. The bearing unit can move transversely to the axis of rotation, allowing the contact pressing force to automatically increase when driving forces act in one direction, and decrease when no driving force is present. This dynamic adjustment eliminates the need for permanently high pressing forces, reducing wear and energy loss while maintaining reliable drive force transmission when needed.
2Reliability
If the contact pressing force is set high to prevent excessive slip, then slip control is improved, but wear increases
Solution Approach 1:
The pressing force adapts dynamically to the actual driving conditions. When driving forces are applied, the bearing unit displaces transversely, increasing the contact pressing force to maintain adequate friction and prevent excessive slip. When no driving force is present, the pressing force naturally decreases, minimizing wear. This dynamic behavior provides slip control only when necessary.
3Power
If the contact pressing force is set permanently high, then maximum drive force transmission is ensured, but efficiency reduces due to unnecessary pressing forces
Solution Approach 1:
The system transitions from static high pressing force to dynamic adaptive pressing force. The bearing unit's ability to move transversely allows the contact pressing force to be high only when drive forces are transmitted, and low when idle. This eliminates the continuous energy loss associated with permanently high pressing forces while maintaining the capability to transmit maximum drive forces when needed.
4Power
If the contact pressing force is increased to transmit higher driving forces, then power transmission is improved, but wear increases
Solution Approach 1:
The pressing force becomes a variable parameter that increases with the applied driving force. When high driving forces are transmitted in one direction, the bearing unit displaces transversely, increasing the contact pressing force to maintain adequate friction for power transmission. When no or low driving forces are present, the pressing force decreases naturally, minimizing wear. This creates a proportional relationship between power transmission needs and pressing force.
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 reduces wear and improves efficiency by dynamically adjusting the contact pressing force in response to varying driving forces, maintaining efficient force transmission without excessive slip in both directions.
Implementation Method 1
a circumferential surface of a driving roller co-operates with a friction surface, in such a way that the transmission of driving and braking forces of varying magnitudes in both directions is in each case possible
Data Source
AI summary
The invention is directed to a friction wheel drive with a driving roller capable of being driven in a rotary manner, which is mounted on a bearing unit so as to be rotatable about an axis of rotation. The bearing unit is displaceably guided transversely to the axis of rotation, and a circumferential surface of the driving roller can be brought into driving engagement with a friction surface. The bearing unit is coupled to a first mechanical forced guidance system, by which the driving roller, responding to a driving force acting in a first direction, can be automatically pressed against the friction surface with a contact pressing force that increases as the driving force increases. The bearing unit is also coupled to a second mechanical forced guidance system, by which the driving roller, responding to a driving force acting in an opposite second direction, can be automatically pressed against the friction surface with a contact pressing force that increases as the driving force increases.