Spring Damper Layout With Dual Overload Couplings for Torque Relief
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Solution Overview
Problem
Existing spring dampers in motor vehicle drive trains have complex structures with high mass inertia, leading to high torque loads on transmission input shafts and potential overloading, as torque limiters are often positioned close to the damper springs.
Innovation Solution
A second overload protection coupling is inserted radially within the first overload protection coupling between the output of the first coupling and the hub element, providing additional protection and allowing relative rotation above a torque threshold, while a flange element is directly supported on a damper spring to reduce torque loads, and disk regions with friction linings are used for efficient assembly and improved damping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a torque limiter is positioned close to the damper springs to protect the damping mechanism, then the damping mechanism is reliably protected, but the mass moment of inertia of the component connected to the transmission input shaft increases, leading to high torque loads on the transmission input shaft
Solution Approach 1:
The patent divides the protection function into two separate torque limiters: a first torque limiter (6) positioned near the damper springs to protect the damping mechanism, and a second torque limiter (7) positioned near the transmission input shaft to protect the transmission. This segmentation allows each limiter to be optimized for its specific protection target without compromising the other, resolving the contradiction between protecting the damping mechanism and reducing torque loads on the transmission input shaft
Solution Approach 2:
The patent introduces an intermediary component (support segment 12 with disk regions 14, 15, 18) that connects the two torque limiters and provides a structural interface between the damping mechanism and the transmission input shaft. This intermediary allows the torque limiters to be positioned at optimal locations while maintaining structural integrity and minimizing the mass moment of inertia of the rotating assembly
2Reliability
If a spring damper with torque limiter is designed with robust protection, then reliability is improved, but the structure becomes complex with high mass inertia
Solution Approach 1:
The patent merges the two torque limiters (6 and 7) into a single integrated assembly where the support segment 12 with disk regions 14, 15, 18 serves as a common structural element for both limiters. This merging reduces the overall number of separate components and simplifies the assembly process while maintaining the dual-protection functionality, thus improving reliability without proportionally increasing structural complexity
Solution Approach 2:
The support segment 12 with its disk regions 14, 15, 18 performs multiple functions: it serves as the structural connection between the primary and secondary parts, provides mounting surfaces for both torque limiters, and acts as part of the damping mechanism itself. This multi-functionality reduces the need for separate components, thereby reducing structural complexity while maintaining robust protection
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
The solution reduces torque loads on the transmission input shaft and damper springs, enabling a more compact and robust spring damper design that prevents overloading during torque impulses, with both the transmission input shaft and damper mechanism receiving reliable protection.
Implementation Method 1
a secondary part (4) which is supported in a spring-damped manner relative to the primary part (3) by means of several damper springs (9)
Implementation Method 2
a friction device (17) which is operatively inserted between the primary part (3) and the secondary part (4) and has an inhibiting effect on relative rotation between the primary part (3) and the secondary part (4)
Implementation Method 3
The first disk region (14) and the second disk region (15) may each receive a friction lining (16a, 16b) bearing against the secondary part (4)
Data Source
AI summary
A spring damper for a motor vehicle drive train includes a primary part, a secondary part, a hub element, a first overload protection coupling operatively inserted between the secondary part and the hub element and a second overload protection coupling. The secondary part is rotatably received relative to the primary part in a spring-damped manner. The first overload protection coupling includes an output and the second overload protection coupling is operatively inserted between the output and the hub element. The second overload protection coupling is arranged radially within the first overload protection coupling. The first overload protection coupling is closed below a threshold of a torque to be transmitted, and the first overload protection coupling releases a relative rotation between the secondary part and the hub element above the threshold.