Patent ID: 6561938
Filing Date: 2003-05-13
Classification: F16H

Abstract:
A hydrodynamic-mechanical multispeed compound transmission with at least four speeds with a transmission input shaft and a transmission output shaft, said transmission comprising:a hydrodynamic transmission part and a mechanical transmission part connected in series, viewed in the direction of power flow, with means for circumventing the hydrodynamic transmission part during the transmission of power being provided; said hydrodynamic transmission part includes at least one hydrodynamic speed-torque converter; said mechanical transmission part includes a mechanical speed-torque converter device with at least two planetary gear trains, said mechanical transmission part designed in such a manner that a translation in the theoretically possible and successive gear steps that can be used cause gear step jumps, each said gear step jump representing a gear step increase from one gear step to a higher gear step, each said gear step jump having a gear translation ratio between said gear steps associated therewith, said gear translation ratio being defined as phi, phi&lE;1.45 associated with each said gear step jump where the gear steps theoretically directly follow one another, said mechanical transmission part further including a mechanical rear-mounted train, the output of said mechanical speed-torque converter being coupled to the input of the mechanical rear-mounted train, said rear mounted train comprising at least one planetary gear train including a sun gear, an internal-geared wheel, planet gears, and a planet carrier, the first transmission element of the first planetary gear train and the first transmission element of the second planetary gear train as well as the input of the rear-mounted train being formed in each instance by a web of the planetary gear trains; and a coupling between the first transmission element of the first planetary gear train and the first transmission element of the second planetary gear train of the mechanical speed-torque converter device, said coupling forming the output of the mechanical speed-torque converter device, said coupling being coupled to the input of the rear-mounted train.