Dry Damper in Drive Series with Dual Mass Flywheel

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Solution Overview

Problem

Current MHEV architectures lack flexibility to offer different powertrain configurations within the same platform without extensive changes in drivetrain components, limiting cost structures and part universality across product lines.

Innovation Solution

The introduction of a dry damper assembly in the P1 hybrid system, which utilizes existing components from the P2 application, allows for the disconnection of the engine and enhances damping characteristics, enabling the same family of vehicles to use either P1 or P2 systems with reduced costs and common parts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a P2 architecture with disconnect clutch is used, then the electric motor can be disconnected from the ICE, but the device complexity increases and requires additional components not needed in P1 architecture

Engineering Contradiction:

Improveability to disconnect electric motor from ICEVSAvoidnumber of additional components

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The dual mass flywheel is designed to serve multiple functions: it provides damping for the P1 architecture while also serving as the disconnect mechanism for P2 architecture. The dry damper assembly integrated into the DMF provides vibration isolation in P1 mode, while the same component enables motor disconnection in P2 mode, eliminating the need for separate disconnect clutch hardware.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent combines the disconnect clutch functionality with the dual mass flywheel assembly. The dry damper assembly is integrated into the DMF structure, merging what would traditionally be separate components (clutch, damper, flywheel) into a unified assembly that works for both P1 and P2 architectures.

Inventive Principle:

Principle #5Merging (Combining)

2Adaptability or versatility

If different MHEV architectures are offered within the same platform, then product line flexibility improves, but manufacturing costs increase due to extensive changes in drivetrain components

Engineering Contradiction:

Improveproduct line flexibilityVSAvoidmanufacturing costs

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The dual mass flywheel with integrated dry damper assembly is designed as a universal component that can be used across both P1 and P2 MHEV architectures. This single component design allows manufacturers to offer different hybrid configurations within the same platform without requiring extensive changes to drivetrain components, thereby reducing manufacturing costs while maintaining product line flexibility.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The drivetrain is segmented into modular components, with the dual mass flywheel assembly serving as a self-contained module that can be configured for different architectures. This modularity allows the same family of vehicles to be produced with either P1 or P2 systems using mostly common parts.

Inventive Principle:

Principle #1Segmentation

3Reliability

If a dry damper is added in series after the DMF, then damping isolation capabilities are improved, but the device complexity increases

Engineering Contradiction:

Improvedamping isolation capabilitiesVSAvoidnumber of components

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The dry damper assembly is merged with the dual mass flywheel into a single integrated unit. The dry damper components (springs, dampers, housing) are incorporated within the DMF structure, providing enhanced damping isolation capabilities without adding a separate standalone damper assembly. This integration improves vibration isolation while avoiding the complexity of additional discrete components.

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

This solution enables the use of common components across different MHEV architectures, optimizing damping and reducing production costs by allowing the same vehicles to be offered with either P1 or P2 systems, and enabling universal parts usage across different product lines.

Implementation Method 1

The dry damper assembly may include a coil spring, or a plurality of coil springs that are circumferentially spaced apart, located between the input flange and the output flange

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 2

The dry damper assembly may have a centrifugal pendulum absorber located between the input flange and the output flange

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 3

dry damper

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS11028899B1Dry damper in drive series with dual mass flywheel for hybrid drive

Publication Date: 2021.06.08 SCHAEFFLER TECHNOLOGIES AG & CO KG

AI summary

A hybrid drive system includes a dual mass flywheel having an input side adapted for connection to a crankshaft of an internal combustion engine and an output. A dry damper assembly having an input flange is connected to an output of the dual mass flywheel and an output flange. An electric motor having a fixed mounted stator and a rotor is provided, and the output flange is connected to the rotor. A torque converter having a torque converter input is connected to the rotor and a torque converter output flange is adapted for connection to a downstream drive input shaft.