Torque Limiter Friction Lining for Predefined Slip Control
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Solution Overview
Problem
Existing torque limiters in drive trains require increased assembly complexity and higher costs due to form-fit or substance-bonded fixing of friction linings, which complicates production and increases costs.
Innovation Solution
A torque limiter design featuring friction linings with different friction coefficients, arranged to slip on one friction surface while remaining connected to another, eliminating the need for circumferential direction connections, and utilizing a composite material with distinct friction coefficients and a preload spring for assembly simplicity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If friction lining is fixed to friction surface via form-fit connections (riveting or intermeshing profiling), then the friction lining is securely attached, but assembly complexity and production costs increase
Solution Approach 1:
The invention extracts and eliminates the form-fit connection structure (such as rivets or intermeshing profiles) from the friction lining attachment system. Instead of using these additional connecting elements, the patent relies solely on frictional forces between the friction lining and friction surfaces to secure the lining during operation, thereby reducing assembly complexity while maintaining attachment reliability
Solution Approach 2:
The invention introduces a preload mechanism (such as a spring) as an intermediary element that generates axial pressing force between the friction lining and the friction surfaces. This preload acts as a mediator to create sufficient normal force for frictional attachment, replacing the need for direct form-fit connections and simplifying the overall assembly structure
2Reliability
If friction lining is connected to friction surface via substance bonding (adhesive), then the friction lining is securely attached, but production costs and assembly complexity increase
Solution Approach 1:
The invention extracts and eliminates the adhesive substance bonding from the friction lining attachment system. By relying on frictional forces generated through preload, the patent removes the need for adhesives entirely, thereby reducing production costs and simplifying the manufacturing process while maintaining secure attachment
Solution Approach 2:
The preload mechanism serves as an intermediary that generates the necessary normal force to create frictional attachment between the friction lining and friction surfaces. This mechanical intermediary replaces the chemical bonding function of adhesives, achieving secure attachment through physics-based friction rather than chemical adhesion
3Ease of manufacture
If friction lining has uniform friction coefficient on both surfaces, then manufacturing is simpler, but predefined slipping control at specific friction surface becomes difficult
Solution Approach 1:
The invention applies local quality by creating asymmetric friction coefficients on different surfaces of the friction lining. The first friction surface has a first friction coefficient while the second friction surface has a second friction coefficient, allowing different functional requirements to be met at different locations. This enables precise control of slipping behavior at the first surface while maintaining frictional connection at the second surface
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
Enables predefined slipping and efficient torque transmission without additional connections, reducing assembly complexity and costs while maintaining effective torque limiting functionality.
Implementation Method 1
The drive side (5) and the output side (6) are connected together torque-transmissively via at least one friction lining (7, 8) and under a preload (9) acting in the axial direction (3)
Implementation Method 2
under a preload acting in the axial direction
Data Source
AI summary
A torque limiter for a drive train includes a rotational axis extending in an axial direction, a drive side, an output side, a first friction surface on a one of the drive side or the output side, a second friction surface on the other of the drive side or the output side, and a friction lining. The friction lining has a first material with a first friction coefficient facing the first friction surface and a second material with a second friction coefficient, different from the first friction coefficient, facing the second friction surface. The friction lining is under a preload acting in the axial direction, torque-transmissively connects the output side to the drive side until a limit torque is reached, and is arranged to slip on the first friction surface when the limit torque is exceeded.