Torsional Vibration Damper Cam Mechanism for Precise Release Torque
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Solution Overview
Problem
Existing torsional vibration dampers with torque limiters have limited precision in setting the release moment and high manufacturing costs, along with complex structures that occupy significant installation space.
Innovation Solution
A torsional vibration damper with a torque limiter featuring an input part and an output part connected via cam mechanisms and a spring device, allowing for a torsion curve with a damper stage and an end stage, where the end stage specifies torque limitation, enabling precise setting of the release moment and reducing installation space and manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a series-connected friction clutch is used as a torque limiter, then the drive train is protected from over-moments, but the precision of setting the release moment is limited by contact force and component stiffness
Solution Approach 1:
The patent replaces the friction-based torque limiter with a cam mechanism that uses geometric profiles to control torque transmission. The cam profile geometry directly determines the release moment, eliminating dependence on friction coefficients and contact forces, thereby achieving precise and repeatable torque limitation.
Solution Approach 2:
The invention changes the controlling parameter from friction-based contact force to cam profile geometry. By designing specific cam contour shapes and dimensions, the release moment can be precisely calculated and manufactured, providing better control over the torque limiter's activation point.
2Strength
If traditional torque limiter designs are used, then the structure provides sufficient strength, but manufacturing costs are high and installation space is large
Solution Approach 1:
The patent combines the torque limiter function with the torsional vibration damper into a single integrated component. The cam mechanisms are incorporated within the existing damper structure, eliminating the need for separate torque limiting components and reducing overall device complexity and installation space.
Solution Approach 2:
The cam mechanisms serve multiple functions: they act as torque limiters while also contributing to the torsional vibration damping through their geometric profiles. This multi-functionality reduces the number of components needed and simplifies the overall structure.
3Strength
If traditional torque limiter designs are used, then the structure provides sufficient strength, but manufacturing costs are high
Solution Approach 1:
The invention changes from friction-based components requiring precise surface treatments and material selections to cam mechanisms where the critical parameter is geometric profile. This allows for more straightforward manufacturing processes such as CNC machining or casting, reducing manufacturing costs while maintaining strength.
4Strength
If traditional torque limiter designs are used, then the structure is robust, but installation space is significant
Solution Approach 1:
The cam mechanisms are nested within the existing torsional vibration damper structure. The torque limiting components are integrated into the space already occupied by the damper, eliminating the need for additional installation space while maintaining structural robustness.
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 allows for precise setting of the release moment and reduces manufacturing costs by utilizing cam mechanisms and a spring device to create a torsion curve that effectively dampens and limits torque, absorbing impacts without significant increase in moment transmission.
Implementation Method 1
an output part (18) arranged so as to be rotatable to a limited extent about the rotation axis (12) relative to the input part (14) against the effect of a spring device (16)
Implementation Method 2
at least two torque-transmitting intermediate elements (20) are arranged between the input part (14) and the output part (18) so as to be moved radially by means of cam mechanisms (22) on a relative rotation of the input part (14) and the output part (18)
Implementation Method 3
the friction linings can slip if they receive at least a prespecified torque value, whereby the torque is limited or impacts are absorbed
Data Source
AI summary
A torsional vibration damper (10) with a torque limiter includes an input part (14), an output part (18), and at least two torque-transmitting intermediate elements (20) arranged between the input part (14) and the output part (18) so as to move radially by cam mechanisms (22) in the case of a relative rotation of the input part (14) and the output part (18). In the case of a relative rotation between the input part and the output part, a torsional characteristic curve (32) of a drive torque over the rotary angle has a damper stage (34) and an end stage (36) which adjoins the damper stage (34), he damper stage (34) specifies a damper capacity of the drive torque over the rotary angle, and the end stage (36) includes a torque limitation of the drive torque over the rotary angle.