Drivetrain Torque Limiter With Dual-Radius Friction Lining Slip
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Solution Overview
Problem
Existing torque limiters for drivetrains require increased assembly and production effort due to the need for positive or material connections between friction linings and surfaces, leading to higher costs.
Innovation Solution
A torque limiter design featuring friction linings with different mean radii, where one surface is designed for sliding and the other for frictional connection without material or positive connections, utilizing a bias spring for pre-stress and incorporating cutouts and elevations to manage torque transmission and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If positive connections (riveting, profilings) or material bonding (cementing) are used to fix friction linings on one friction surface, then slipping is prevented on that surface ensuring stable slip torque, but assembly and production effort increases and costs rise
Solution Approach 1:
The invention extracts the positive connection elements (rivets, profilings) and material bonding agents (cement) from the friction lining assembly process. Instead of fixing the friction lining to one surface, the design allows both friction surfaces to remain free, with the friction lining able to slip on both surfaces when limiting torque is exceeded, thereby eliminating the need for complex assembly operations while maintaining torque limiting functionality
Solution Approach 2:
The invention changes the friction characteristics by providing different friction coefficients on the two friction surfaces. The first friction surface has a first friction coefficient and the second friction surface has a second friction coefficient, where at least one differs from the other. This parameter differentiation allows the friction lining to naturally preferential slip on one surface while maintaining frictional connection on the other, achieving stable torque limiting without positive connections
2Reliability
If friction linings are materially bonded or positively connected to one friction surface, then slipping is controlled on that surface, but production costs increase
Solution Approach 1:
The invention removes the need for costly material bonding agents and positive connection hardware by designing a system where the friction lining interacts with both friction surfaces through friction alone, with differential friction coefficients guiding the slipping behavior without requiring additional components or complex assembly processes
Solution Approach 2:
By changing the friction coefficient parameter on one or both friction surfaces, the invention achieves controlled slipping behavior that maintains consistent torque limiting performance without incurring the additional production costs associated with special materials, bonding agents, or positive connection elements
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 design allows for efficient torque transmission and wear management, reducing assembly complexity and costs while maintaining effective torque limiting functionality.
Implementation Method 1
a bias spring (9) which acts on the friction linings (7, 8) with a pre-stress (9)
Implementation Method 2
The drive side (5) and the output side (6) are connected with one another in a torque-transmitting manner through at least one friction lining (7, 8) under a pre-stress (9) acting in the axial direction
Implementation Method 3
When the limiting torque is exceeded, the at least one friction lining (7, 8) is disposed slidingly on a first friction surface (11)... At the same time, the at least one friction lining (7, 8) is (furthermore) frictionally connected to a second friction surface (12)
Data Source
AI summary
A torque limiter for a drivetrain includes a friction lining, a drive side, and an output side, connected to the drive side by the friction lining until a limiting torque is reached. The torque limiter also has a first friction surface on the drive side or the output side, a first contact surface between the friction lining and the first friction surface, a second friction surface on the other of the drive side or the output side, and a second contact surface between the friction lining and the second friction surface. The first contact surface has a first mean friction radius and the second contact surface has a second mean friction radius, different than the first mean friction radius. When the limiting torque is exceeded, the friction lining is positioned slidingly on the first friction surface, and the friction lining is frictionally connected to the second friction surface.