IP Library › Granted Patent US 10,072,727
Granted Patent B2
US 10,072,727 · App. 15/898,345 · Granted Sep 11, 2018

Torsional-vibration damping system for a vehicle drive train

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Quick Facts
Patent No.
US 10,072,727
App. No.
15/898,345
Granted
Sep 11, 2018
Kind
B2
Abstract

A drive train is disclosed that includes an engine operable in a first engine operating state and a second engine operating state and a torsional-vibration damping system operatively connected to the engine. The torsional-vibration damping system includes a first torsional-vibration damper having a primary inertial mass and a secondary inertial mass, a second torsional-vibration damper, a first centrifugal pendulum arranged on the secondary inertial mass of the first torsional-vibration damper, and a second centrifugal pendulum arranged on the second torsional-vibration damper.

Claims (13)

1. A drive train, comprising:

an engine operable in a first engine operating state and a second engine operating state;

a torsional-vibration damping system operatively connected to the engine, the torsional-vibration damping system including:

a first torsional-vibration damper having a primary inertial mass and a secondary inertial mass;

a second torsional-vibration damper;

a first centrifugal pendulum arranged on the secondary inertial mass of the first torsional-vibration damper; and

a second centrifugal pendulum arranged on the second torsional-vibration damper.

2. The drive train of claim 1 , wherein the first centrifugal pendulum is configured to control a torsional-vibration behavior of the engine during the first engine operating state, and the second centrifugal pendulum is configured to control the torsional-vibration behavior of the engine during the second engine operating state.

3. The drive train of claim 2 , wherein the first centrifugal pendulum is configured to control the torsional-vibration behavior of the engine with torsional vibrations of vibration order two, and the second centrifugal pendulum is configured to control the torsional-vibration behavior of the engine with torsional vibrations of vibration order one.

4. The drive train of claim 1 , wherein the first torsional-vibration damper further includes a first spring device of a first stiffness with a first spring rate, and the second torsional-vibration damper further includes a second spring device of a second stiffness with a second spring rate, wherein the second stiffness of the second spring device is greater than the first stiffness of the first spring device.

5. The drive train of claim 4 , wherein the first spring device includes arc springs.

6. The drive train of claim 4 , wherein the first spring device is provided for torques up to a maximum switch-off torque, and the second spring device is provide for torques higher than the maximum switch-off torque.

7. The drive train of claim 1 , wherein the first torsional-vibration damper and the second torsional-vibration damper are one-stage dampers.