Frequency Dynamic Absorber for Torsional Vibration Damper

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Solution Overview

Problem

Current hydrokinetic torque coupling devices with dynamic absorbers for torsional vibration damping face limitations in enhancing performance and reducing costs, particularly in effectively managing torsional vibrations and resonance frequencies at low engine rotational speeds.

Innovation Solution

A torsional vibration damper assembly is introduced, featuring a driven member, a retainer plate, and a plurality of damper elastic members, along with a dynamic absorber with an inertial member that is rotationally guided and centered, enhancing the damping of torsional vibrations and resonance frequencies by elastically coupling the retainer plate to the driven member.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a dynamic absorber with a heavy inertia member is added to the torsional vibration damper, then the resonance frequency is lowered and vibration damping performance is improved, but the device complexity and manufacturing cost increase

Engineering Contradiction:

Improvevibration damping performanceVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the dynamic absorber with the torsional vibration damper into a single integrated assembly. The inertial member of the dynamic absorber is mounted directly on the driven member of the vibration damper, and both share common elastic members (damper elastic members and absorber elastic members) that provide both damping and frequency-lowering functions. This merging eliminates the need for separate dynamic absorber and vibration damper components, reducing overall device complexity while maintaining improved vibration damping performance and lowered resonance frequency.

Inventive Principle:

Principle #5Merging (Combining)

2Reliability

Engineering Contradiction:

Improvevibration damping performanceVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent integrates the dynamic absorber and torsional vibration damper into one assembly, allowing both components to share common elements such as the driven member, retainer plate, and elastic members. This consolidation reduces the total number of parts that need to be manufactured and assembled, thereby lowering manufacturing costs despite the addition of the inertial member for improved vibration damping performance.

Inventive Principle:

Principle #5Merging (Combining)

3Object-affected harmful factors

If damper elastic members are used to elastically couple the retainer plate to the driven member, then torsional vibrations are damped, but the device complexity increases

Engineering Contradiction:

Improvetorsional vibrationsVSAvoiddevice complexity

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The damper elastic members serve dual functions: they provide torsional vibration damping by elastically coupling the retainer plate to the driven member, and they simultaneously support the inertial member of the dynamic absorber. This multi-functional use of the same elastic members eliminates the need for separate damping elements, thereby reducing device complexity while effectively damping torsional vibrations.

Inventive Principle:

Principle #5Merging (Combining)

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 torsional vibrations and reduces resonance frequencies at low engine speeds, improving the overall performance and cost-effectiveness of hydrokinetic torque coupling devices by utilizing a dynamic absorber with an inertial member to manage rotational fluctuations.

Implementation Method 1

a plurality of damper elastic members interposed between the first retainer plate and the driven member. The damper elastic members elastically couple the first retainer plate to the driven member

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The dynamic absorber includes an inertial member. The inertial member is mounted to the torsional vibration damper rotatably relative to the driven member

Methodology Applied

Scientific EffectInertia: Inertia

Data Source

PatentUS10054208B2Frequency dynamic absorber for torsional vibration damper of hydrokinetic torque coupling device

Publication Date: 2018.08.21 VALEO KAPEC CO LTD

AI summary

A torsional vibration damper assembly for a hydrokinetic torque coupling device, comprises a torsional vibration damper, and a dynamic absorber operatively connected to the torsional vibration damper. The torsional vibration damper comprises a driven member rotatable about a rotational axis, a first retainer plate rotatable relative to the driven member coaxially with the rotational axis, and a plurality of damper elastic members interposed between the first retainer plate and the driven member. The damper elastic members elastically couples the first retainer plate to the driven member. The dynamic absorber includes an inertial member. The inertial member is mounted to the torsional vibration damper rotatably relative to the driven member. The inertial member is rotationally guided and centered relative to the rotational axis by the driven member of the torsional vibration damper.