Abstract: In a method of preventing vibration noise in change-speed gearboxes, in particular of motor vehicles, with an electronic control of the ignition and the fuel measuring control of the internal combustion engine which is variable timewise as a function of events, the internal combustion engine is controlled as a function of the occurrence of gearbox vibration noise in order to change the combustion process of the said internal combustion engine so that no irregularities occur in the rotational vibration behavior.

Abstract: The invention relates to a transmission for vehicles, in particular for automobiles with front wheel drive, which have a driving motor mounted transverse to the longitudinal direction of the vehicle, whose drive shaft drives the primary shaft of an infinitely variable belt drive having a secondary shaft driven in the same direction of rotation by means of a drive belt and mounted coaxially with the drive pinion of a differential gear provided with output shafts. A reversing and reduction gearing, designed as a planetary gearset, is mounted coaxially with the secondary shaft of the belt drive and connected through its input member to the secondary shaft and through its output member to the drive pinion of the differential gearing, while its reactive section is fixed to the casing. As a result, a very compact transmission unit is achieved, having in forward drive position an output rotation in the same direction as the input rotation.