# US 8,998,732 B2 · Device for damping vibrations in a drive train

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- Number: US 8,998,732 B2
- Document ID: US8998732B2
- Status: Granted
- Kind: B2
- Application number: 13/812,705
- Filed: 2011-07-21
- Published: 2013-05-16
- Granted: 2015-04-07
- Earliest claimed: 2010-07-29
- Assignees: Andritz Inc.
- Applicants: Roman Eichinger
- Inventors: Roman Eichinger
- Web page: https://patentgrep.com/patent/US8998732B2

## CPC

- F16D 3/14: combined with a friction coupling for damping vibration or absorbing shock
- F16D 7/021: {with radially applied torque-limiting friction surfaces (F16D7/022 takes precedence)}
- F16F 7/02: with relatively-rotatable friction surfaces that are pressed together (F16F7/01 takes precedence; one of the members being a spring F16F13/02 {; friction devices between relatively-movable parts of a hinge E05D11/08; braking devices for wings E05F5/00})
- F16F 7/08: with friction surfaces rectilinearly movable along each other (F16F7/01 takes precedence {; one of the members being a spring F16F13/02})
- F16F 15/10: Suppression of vibrations in rotating systems by making use of members moving with the system (by balancing F16F15/22 {; yielding couplings F16D3/00} ; with flywheels acting variably or intermittently F16H {; construction providing resilience or vibration-damping for gear elements F16H55/14})
- F16F 15/12: using elastic members or friction-damping members, e.g. between a rotating shaft and a gyratory mass mounted thereon ({F16F15/14} , F16F15/16 take precedence)
- F16C 3/02: Shafts; Axles
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16F: SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

A device for damping vibrations in a drive train, in particular for plug screws in the pulp and paper industries. The device is principally characterized in that a cylindrical shaft, preferably designed as a hollow shaft, is provided, wherein the cylindrical shaft is arranged between the halves of a coupling and at least one ring having friction surfaces is arranged around the cylindrical shaft. Stick-slip vibrations that occur can thereby be favorably eliminated, and thus the gearbox and the motor of the drive train can be protected.

## Claims

### Claim 1

A device for damping vibrations in a drive train, comprising:
a cylindrical shaft having opposing ends, each end having a circumferential flange for mounting the device, the circumferential flanges defining a torsion spring element of the device;
at least one ring arranged around the cylindrical shaft and having friction surfaces on the outside of each of the at least one ring; and
a hollow cylinder arranged around the at least one ring and rotatably engaging the friction surfaces of the at least one ring, the hollow cylinder having slots which extend axially and are arranged around a circumference of the hollow cylinder.

### Claim 2 (depends on 1)

The device as claimed in claim 1, wherein the hollow cylinder is divided into at least two separate parts.

### Claim 3 (depends on 1)

The device as claimed in claim 1, wherein a tangentially preloaded clamping band is provided around the hollow cylinder for imparting damper torque.

### Claim 4 (depends on 1)

The device as claimed in claim 1, wherein a plurality of preloaded tie rods arranged tangentially around the circumference are provided for imparting damper torque.