Infinitely variable hydrostatic mechanical power shift gearbox
March 14, 2014. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3580107 3709060 3884095 3888139 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 InventorsAssigneeApplicationNo. 212314 filed on 03/14/1994US 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 unitExaminersPrimary: Wright, DirkAssistant: Ta, Khoi Q. Attorney, Agent or FirmForeign Patent References
International ClassesF16H 037/08F16H 047/04 Foreign Application Priority Data1987-05-12 DEAbstractThe 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. | |
