Torsional Vibration Damper Axial Connection Segmentation

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Solution Overview

Problem

Existing torsional vibration damper arrangements in vehicle drivetrains face challenges in maintaining a stable coupling between cover disk elements, particularly under centrifugal forces, which can lead to axial spreading and potential breakage of connection elements due to overloading.

Innovation Solution

The implementation of second connection elements, such as rivet pins, radially outside the damper spring arrangement, which provide axial support and prevent axial movement between cover disk elements, ensuring a fixed rotational connection only through first connection elements, while allowing for a gap-like intermediate space for relative movement and tilting, thus preventing torque transmission and reducing the risk of overloading.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If first connection elements are used to fix cover disk elements axially and transmit torque, then torque transmission is improved, but the risk of overloading and breakage increases under centrifugal forces

Engineering Contradiction:

Improvetorque transmissionVSAvoidconnection element durability

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The connection function is segmented into two distinct tasks: first connection elements (radially inside) handle torque transmission, while second connection elements (radially outside) handle axial positioning. This division allows each element type to be optimized for its specific function, preventing overload of the torque-transmitting elements by centrifugal forces.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second connection elements act as intermediary support structures that bear the centrifugal loads and prevent axial spreading, thereby protecting the first connection elements from overload. These intermediary elements absorb the harmful centrifugal forces before they can affect the torque transmission elements.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If connection elements are rigidly fixed to prevent axial movement, then axial stability is improved, but torque transmission capability deteriorates due to overloading

Engineering Contradiction:

Improveaxial stabilityVSAvoidtorque transmission

Core Design Contradiction:

Stability of the object's compositionVSPower

Solution Approach 1:

The connection system is segmented into two functional groups: second connection elements (radially outside) provide axial stability by preventing spreading, while first connection elements (radially inside) provide torque transmission. This segmentation allows independent optimization of each function without compromise.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the cover disk elements are assigned different connection qualities: the radially outer region (second connection elements) provides rigid axial support, while the radially inner region (first connection elements) provides flexible torque transmission. This local differentiation of connection properties resolves the contradiction.

Inventive Principle:

Principle #3Local quality

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 configuration ensures a stable and defined axial connection between cover disk elements, preventing axial spreading and overloading, while maintaining effective torque transmission through the first connection elements, thereby enhancing the durability and reliability of the torsional vibration damper arrangement.

Implementation Method 1

a torsional vibration damper with a primary side and a secondary side that is rotatable with respect to the primary side around an axis of rotation against the action of a damper spring arrangement

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

the cover disk elements are connected to one another by first connection elements radially inside the damper spring arrangement so as to be fixed axially and so as to transmit torque

Methodology Applied

Scientific EffectTorque transmission: Torque

Implementation Method 3

the cover disk elements are connected to one another by second connection elements in such a way that they are prevented from moving axially away from one another so that substantially no torque can be transmitted between the cover disk elements by the second connection elements

Methodology Applied

Scientific EffectCentrifugal force resistance: Centrifugal Force

Data Source

PatentUS8960396B2Torsional vibration damping arrangement, particularly for the power train of a vehicle

Publication Date: 2015.02.24 ZF FRIEDRICHSHAFEN AG

AI summary

A torsional vibration damper arrangement including a torsional vibration damper with a primary side and a secondary side rotatable with respect to the primary side around an axis of rotation against the action of a damper spring arrangement. One side of the primary side and secondary side includes two cover disk elements and a central disk element arranged between the cover disk elements. The cover disk elements are connected to one another by first connection elements radially inside the damper spring arrangement so as to be fixed axially and so as to transmit torque. The cover disk elements are connected to one another by second connection elements in such a way that they are prevented from moving axially away from one another. No torque can be transmitted between the cover disk elements by the second connection elements.