Zf Friedrichshafen Ag

Gerhard F&uuml;hrer

Hermann Lanz

Roland Stauber

Marcus Raeder

In a transmission ( ) for a motor vehicle with a main transmission part ( ) which possesses a plurality of gear steps and wherein, between each step a step-jump in the gear ratio is provided, and with a split transmission part ( ) for the separation of the step-jumps of the gear steps of the main transmission part ( ) and with an area group transmission part ( ) for the extension of the over-all gear ratio of the gear steps of the main transmission part with a slow and a rapid gear ratio area, the average gear step-jump of the upper gear steps is approximately at least 0.7% less than the geometric step-jump calculated theoretically from the total gear ratio.

Vehicle transmission with progressive stepping

Multi-speed step-change transmission for commercial vehicles having an one input shaft, a main shaft placed in an axial extension, one countershaft parallel thereto and one intermediate shaft parallel to the two shafts for the reverse gear and the shafts have gear wheels forming the ratio steps of the transmission. The sum of the tip radii of the intermediate gear ( ) for the reverse gear and of the main shaft gear ( ) for the first gear is smaller than the axial separation (a) between the main shaft ( ) and the intermediate shaft ( ).

Step-change gearbox

In the case of a vehicle transmission ( ) with two counter shafts placed in a transmission housing ( ) for the distribution of load, with one input shaft ( ) and one main shaft ( ) coaxially aligned with the input shaft ( ), a gear ( ) is placed in the area between the input shaft ( ) and the main shaft ( ). The gear ( ) is secured by a bearing ( ) between the input shaft ( ) and the main shaft ( ) and secured radially by bearings between the two counter shafts. The bearing ( ) constitutes the exclusive axial bearing between the input shaft ( ) and output shaft ( ). The axial bearing comprises two axial effective roller bearings ( ) which lie on opposed sides of a projection ( ) of the gear ( ).

Gearwheel bearing in gearboxes

The invention relates to a synchronization device ( ) for torque-transmitting components ( ) of a transmission comprising a disk set ( ) which has several disks ( ) and a synchronizer sleeve ( ) connected to a shifting device ( ). The synchronizer system ( ) has mechanisms ( ) that divide the torque among the torque transmitting components ( ) into an initial lower torque and a subsequent larger synchronizing torque. This is preferably achieved by a gradation of the disk ( ) that enables a successive engagement of the disks on the torque transmission.

Growing community of inventors

Friedrichshafen, Germany

Gerhard Führer

Growing community of inventors

Friedrichshafen, Germany

Gerhard F&uuml;hrer

Gerhard Führer