Centrifugal Pendulum Coupling for Quiet Torque Transmission
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Solution Overview
Problem
Existing torque transmitting devices in motor vehicle drive trains suffer from inefficient and unreliable centrifugal pendulums, leading to increased torsional vibrations and operating noise.
Innovation Solution
The torque transmitting device incorporates a centrifugal pendulum design with improved efficiency and reliability, featuring a dual pendulum mass configuration and advanced coupling means, such as spring elements and connecting elements, to reduce torsional vibrations and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a centrifugal pendulum is used to reduce torsional vibrations, then vibration reduction is achieved, but operating noise increases
Solution Approach 1:
The pendulum mass is divided into multiple segments (first pendulum mass part and second pendulum mass part) arranged on opposite axial sides of the pendulum mass carrier. This segmentation allows the pendulum masses to counterbalance each other's gravitational effects, reducing operating noise while maintaining vibration reduction capability
Solution Approach 2:
The first and second pendulum mass parts are arranged on opposite axial sides of the pendulum mass carrier, creating a counterweight configuration. This arrangement causes the gravitational forces of the two mass parts to oppose each other, significantly reducing operating noise during electric driving while preserving the centrifugal force generation for torsional vibration reduction
2Reliability
If coupling means are added to connect pendulum masses, then reliability is improved, but device complexity increases
Solution Approach 1:
The coupling means are integrated into the existing pendulum mass structure, combining the connection function with the pendulum mass components themselves. This merging approach improves reliability by ensuring secure connection while avoiding the need for separate, complex coupling mechanisms
Solution Approach 2:
The coupling means use uniform structural elements and materials consistent with the existing pendulum mass design. This homogeneity simplifies manufacturing and assembly while ensuring reliable connection, avoiding the introduction of disparate components that would increase complexity
3Object-generated harmful factors
If pendulum masses are arranged on opposite axial sides, then noise is reduced, but manufacturing complexity increases
Solution Approach 1:
The pendulum mass is segmented into two parts arranged on opposite axial sides, which can be manufactured separately and then assembled. This segmentation enables modular manufacturing, reducing the complexity of producing a single large balanced mass while achieving the noise reduction benefit of opposite-side arrangement
Solution Approach 2:
The first and second pendulum mass parts are positioned to nest or align with each other on opposite axial sides of the pendulum mass carrier. This nested arrangement optimizes space utilization and simplifies the overall structure, making the dual-mass configuration more manufacturable while maintaining the noise reduction advantage
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 enhanced centrifugal pendulum design significantly reduces torsional vibrations and operating noise, especially during electric driving, while maintaining efficient torque transmission.
Implementation Method 1
A centrifugal pendulum causes a counterbalancing of torsional vibrations
Implementation Method 2
The first pendulum mass part and the second pendulum mass part can be elastically coupled to one another via spring elements
Data Source
AI summary
A torque transmitting device for a drive train for transmitting an input torque provided by at least one drive element to an output element. The device including: an electric motor having a stator and a rotor which can be rotated relative to said stator for providing a further drive torque; a separating clutch arranged operatively between the first drive element and the electric motor; and at least one centrifugal pendulum which is arranged operatively between the separating clutch and the output element and has at least two pendulum masses which are accommodated so as to be deflectable to a limited extent along a pendulum path and so as to be peripherally adjacent to one another on at least one pendulum mass carrier that can be rotated about an axis of rotation, wherein the peripherally adjacent pendulum masses are coupled to one another via coupling means.