Dr.-Ing. Georg Jehle


Friction Induced Vibrations in Shift Gearboxes

Components of a shift gearbox: Pressure plate (PP), clutch disc (CD), gears (G1,G2), shafts
Shift gearbox (elastic lamella)

A shift gearbox is a commonly used element in automotive transmissions, which is needed for two reasons. Firstly, it transmits the driving torque of the motor. Secondly, because a combustion engine works best at its nominal speed, it changes the gears. Experimental data reveal that in a shift gearbox, friction-induced vibrations are possible during the shifting period. The vibrations are visible in the pressure signal of the actuation of the clutch, which implies a coupling with the axial movement of the gear unit input shaft.

The suggested model consists of a pressure plate, a clutch disc, a gear unit input shaft and a tooth contact. The gear unit input shaft is rigidly connected to the gearing and the clutch disc and has translational and rotational degrees of freedom. The tooth contact imposes a kinematic constraint. This is why the sliding friction torque is transformed into forces in axial and radial direction of the shaft. Depending on the gearing parameters and the slip, the contact normal force between clutch disc and pressure plate is amplified (motor accelerating) or reduced (motor slowing down) by the toothing. For both shifting situations, there can be found a region of flutter instability in the parameter space.

Besides the stationary solution, also periodic orbits are possible. E.g. there exists a stable piecewise-continuous limit cycle for a slowing down motor: During one period, the contact between the clutch disc and the pressure plate opens shortly. This limit cycle depends on parameters (masses, stiffnesses, ...) as well as on operation conditions.

Contact: Prof. A. Fidlin



G. Jehle, 2016.
Zur Modellbildung und Simulation reibungserregter Schwingungen in Pkw-Schaltgetrieben.
KITopen, DOI 10.5445/IR/1000063372.

G. Jehle, A. Fidlin, O. Drozdetskaya, 2016.
Nonlinear dynamics of gearboxes with flexible friction clutch.
Proc. of ICTAM, 2016.

G. Jehle, A. Fidlin, 2016.
On the influence of the lamella's elasticity on self-excited vibrations in gearboxes.
PAMM, 16: 273-274. DOI:10.1002/pamm.201610125

G. Jehle, A. Fidlin, 2015.
Simulation starrer Verzahnung mit Reibung.
VDI-Berichte 2262, 9. Fachtagung Schwingungen in Antrieben 2015, Fulda, 28. und 29. Oktober 2015, VDI Verlag Düsseldorf 2015, S. 61-72

G. Jehle, A. Fidlin, 2015.
Numerical and experimental investigation of the effect of a fluid pipe on systems subjected to forced vibrations.
Proc. of ICoEV 2015, International Conference on Engineering Vibration, Ljubljana, 7-10 September 2015, p. 1079-1087.

Jehle, G. and Fidlin, A., 2015.
A DAE formulation for geared rotor dynamics including frictional contact between the teeth.
PAMM., 15: 251–252. doi: 10.1002/pamm.201510116

G. Jehle, M. Köster, A. Fidlin, A. Fridrich, 2014.
On the influence of the fluid pipe on the stability of a mechanical system subjected to friction-induced vibrations
Proc. of ENOC 2014, Eighth EUROMECH Nonlinear Dynamics Conference, 06 – 11 July 2014, Vienna, Austria, 2 p, ISBN: 978-3-200-03433-4.

Koester, M., Jehle, G. and Fidlin, A. 2014.
System Identification based on Model Synchronization
PAMM, 14: 929–930. doi: 10.1002/pamm.201410445

Jehle, G. and Fidlin, A., 2014.
Influence of the hydraulic fluid pipe on the dynamic stability of a shift gearbox
PAMM, 14: 279–280. doi: 10.1002/pamm.201410127

G. Jehle and A. Fidlin, 2014.
Friction induced vibrations in shift gearboxes
ZAMM, 94, No. 11, 911 – 916 (2014) / DOI 10.1002/zamm.201300252

G. Jehle, A. Fidlin, 2013.
Schwingungen in Schaltgetrieben: Selbsterregung durch Reibung in der Kupplung und Modenkopplung in der Verzahnung
VDI-Berichte 2197, 8. Fachtagung Schwingungen in Antrieben 2013, Fulda, 5. und 6. November 2013, VDI Verlag Düsseldorf 2013, S. 209-222

D. Kern, G. Jehle, W. Seemann, 2010.
A Wavebased Micromotor for Plane Motions (3-DoF)
Proc. of COMSOL User Conference 2010 (Paris 2010)