Dual-Turbine Torsional Vibration Damper with Centrifugal Pendulum
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Solution Overview
Problem
Existing torsional vibration dampers for motor vehicle drivetrains, particularly those with hydrodynamic torque converters, face challenges in design complexity and axial space constraints, especially for dual-turbine dampers, which require multiple components and offset spring elements, making them costly and difficult to implement in small vehicles.
Innovation Solution
A dual-turbine torsional vibration damper design featuring two energy storage elements connected in series with an intermediate mass and a centrifugal pendulum device, where the energy storage elements are positioned on a common circumference and the centrifugal pendulum device is integrated on the intermediate mass, allowing for efficient damping with reduced axial space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dual-turbine damper with multiple components is used to achieve effective damping, then damping performance is improved, but device complexity and production cost increase
Solution Approach 1:
The patent combines two dampers into a single integrated unit where the first and second dampers share a common intermediate mass and are circumferentially displaced from each other. This merging approach maintains the dual-turbine damping functionality while reducing the overall number of separate components, thereby improving reliability without proportionally increasing device complexity
Solution Approach 2:
The intermediate mass serves multiple functions simultaneously: it acts as the moving mass for both the first and second dampers, provides mounting points for both energy storage elements, and serves as the attachment point for the centrifugal pendulum device. This multi-functionality reduces the total component count while maintaining effective damping performance
2Reliability
If spring elements are offset axially in a double damper design, then damping effectiveness is improved, but axial construction space increases
Solution Approach 1:
Instead of offsetting spring elements axially (one dimension), the patent positions the first and second dampers circumferentially displaced from each other around the common intermediate mass. This dimensional shift from axial to circumferential arrangement allows both energy storage elements to be effectively positioned for damping while minimizing axial construction space
Solution Approach 2:
The first and second dampers are arranged concentrically around the common intermediate mass, with each damper occupying a different circumferential sector. This nested arrangement allows both dampers to share the same axial space efficiently, reducing the overall axial footprint while maintaining the offset positioning needed for damping effectiveness
3Reliability
If a centrifugal pendulum device is added to cancel periodic torsional vibrations, then vibration damping is improved, but axial construction space and device complexity increase
Solution Approach 1:
The centrifugal pendulum device is integrated with the dual-damper system by attaching it to the common intermediate mass. This merging allows the pendulum device to function as part of the overall damping system without requiring separate mounting structures, thereby improving vibration damping while minimizing the increase in device complexity
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 design enables effective damping of rotational irregularities in both pump and turbine operations while minimizing axial construction space, simplifying the design and reducing component count, thus addressing the complexity and space issues of traditional dual-turbine dampers.
Implementation Method 1
a first damper (11) having a first energy storage element (131), a second damper (12) having a second energy storage element (132)
Implementation Method 2
a centrifugal pendulum device (14) having a plurality of pendulum masses (140) attached to the intermediate mass (110)
Data Source
AI summary
The invention relates to a torsional vibration damper, in particular a dual-turbine damper, for a drivetrain of a motor vehicle, preferably for a drivetrain of a motor vehicle having a hydrodynamic torque converter, having a first damper and a second damper connected to the latter in series, where the two dampers are situated essentially on a common circumference or essentially in a common plane of the torsional vibration damper, there being a damper intermediate mass connected between the two dampers connected in series, and a centrifugal pendulum device provided on the damper intermediate mass.