Hydromechanical power splitting transmission for vehicles
Vehicle drive device with a hydrostatic-mechanical power splitting transmission
Infinitely variable hydrostatic mechanical power shift gear with group shiftings
Continuous-acting hydrostatic-mechanical power-shift transmission with toothed clutches
Mechanical-hydraulic transmission gear system and method of controlling power transmission using the system
Control of a displacement machine of a hydrostatic-mechanical torque shift transmission Patent #: 5207736
ApplicationNo. 212314 filed on 03/14/1994
US Classes:475/72, Fluid pump and motor in one of plural paths to or from planetary gearing475/76, Speed responsive control475/80, Plural speed ranges475/81With constant speed ratio between input and one fluid unit
ExaminersPrimary: Wright, Dirk
Assistant: Ta, Khoi Q.
Attorney, Agent or Firm
Foreign Patent References
International ClassesF16H 037/08
Foreign Application Priority Data1987-05-12 DE
AbstractThe 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.