Torque Transfer Device Centrifugal Pendulum Roller Collar
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Solution Overview
Problem
Torque transmission devices in motor vehicle drive trains experience noise issues during operation due to the interaction between pendulum masses and their carrier devices, which existing technologies have not adequately addressed.
Innovation Solution
The implementation of a centrifugal pendulum device with rollers having collars that prevent contact between pendulum masses and their carrier devices, combined with elastic or damping stop elements to limit movement and reduce noise, and axial stop elements to prevent contact at low speeds, along with a specific design of rollers and recesses for assembly and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pendulum masses are allowed to move freely relative to the pendulum mass carrier device, then the centrifugal pendulum device can effectively dampen torsional vibrations, but contact between pendulum masses and the carrier device generates undesirable noises during operation
Solution Approach 1:
The patent introduces an intermediary element (collar on the roller) between the pendulum mass and the pendulum mass carrier device. This collar prevents direct contact between the pendulum mass and the carrier device, thereby eliminating the noise-generating contact while still allowing the pendulum mass to move freely for vibration damping. The collar acts as a mediator that maintains the functional movement while preventing harmful contact.
2Object-generated harmful factors
If stop elements are added to limit the movement of pendulum masses, then contact between pendulum masses and the carrier device is prevented, but the device complexity increases
Solution Approach 1:
The patent merges the function of the collar and the stop element into a single integrated component. The collar on the roller serves both as a preventive measure against contact during normal operation and as a stop element that limits movement at extreme positions. This merging of functions reduces the number of separate components needed, thereby minimizing the increase in device complexity while still achieving noise reduction.
3Object-generated harmful factors
If axial stop elements are attached to prevent contact at low speeds, then noise is reduced during normal operation, but the ease of assembly and disassembly is reduced
Solution Approach 1:
The axial stop element is pre-installed on the pendulum mass or carrier device during manufacturing, forming an integrated assembly. This preliminary action ensures that the stop element is already in place before final assembly, simplifying the overall assembly process. The stop element is designed to be attached in a straightforward manner, minimizing the additional steps required for assembly and disassembly while still providing noise reduction during normal operation.
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 effectively dampens undesirable noises during operation by preventing contact between pendulum masses and their carrier devices, ensuring reliable assembly and preventing damage, while maintaining movement limitations to enhance noise reduction.
Implementation Method 1
the rollers each have at least one collar which, under the action of centrifugal force, acts on the pendulum mass in the axial direction between the pendulum mass and the pendulum mass carrier device
Implementation Method 2
the movement of the pendulum masses relative to the pendulum mass carrier device is limited by at least one stop element, which in the circumferential direction, at least partially, is designed to be elastic or dampening
Data Source
AI summary
The torque transmission device has a driven shaft e.g. a crankshaft and a transmission with one transmission input shaft. The castors (25,26,35,36) consists of a collar which is arranged between the pendulum mass (11,14,21,23) and the pendulum mass supporting unit (2) under the effect of the centrifugal force on the pendulum mass in axial direction.