Zahnradfabrik Friedrichshafen, Ag.

Other

Friedrich Jarchow

Peter Tenberge

Abdul Arain

Peter Dottger

Dietrich Haensel

Hans-Jurgen Eickhoff

The gearbox includes a multi-shaft toothed-wheel planetary gearing and a continuously adjustable hydrostatic transmission having toothed-wheel auxiliary transmission stages and gear-changing clutches. The hydrostatic transmission is associated with a displacement-type machine with constant displacement volume. In the planetary gearing, one shaft forms the input shaft to which the adjustable displacement-type machine is connected. A second shaft of the planetary gearing is connected to the constant-volume displacement-type machine. Third and fourth shafts of the planetary gearing represent coupling shafts. The coupling shafts alternately act via at least two auxiliary transmission stages, also called gears, on the output shaft. The coupling shafts change their speeds in such a manner that one coupling shaft becomes steadily faster and the other one becomes steadily slower. They behave in such a manner that they exhibit equal speeds in one extreme position. In the extreme positions of the hydrostatic transmission, gear-changing clutches handle the gear change free of load and without interruption of traction force when the speeds are synchronous. The automatic transmission is controlled and regulated by electronic and hydraulic means.

Infinitely variable hydrostatic mechanical power shift gearbox

Circuit change-over gear with infinitely variable transmission

Hydrostatic-mechanical power-distribution transmission

Superimposed steering gear for tracklaying vehicles

The gear consists of a four-shaft epicyclic gear, of which one shaft forms the input shaft which is in connection via an infinitely variable hydrostatic gear with the second shaft and of which the two remaining shafts represent connecting shafts which, in an extreme position of the hydrostatic gear, have the same speeds and behave during adjustment of the hydrostatic gear into the other extreme position in such a way that one becomes constantly slower and the other constantly faster, and which alternately act on the output shaft via gears of a gear group with following group shiftings. What is special is that the group shiftings make possible a multiple utilization of the gears of the gear group and that preparatory shifts for changing the group shifting provide the synchronization of idling gear parts, and that each gear change itself takes place at synchronous speeds, free from load and without tractive force interruption. Such gears require only small hydrostatic gears, have a particularly large transmission control range and favorable efficiencies. Its use in motor vehicles results in fuel savings and a superior acceleration behavior.

Infinitely variable hydrostatic mechanical power shift gear with group

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Friedrichshafen, Germany

Peter Tenberge