Hydromechanical transmission and control method
AssigneeDana Italia S.R.L.
InventorsLorenzo Dalla Palma, Fabio Gunsch, Mario Gelmini, Giovanni Profumo
Life of this patent
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Abstract
Methods and systems for a hydromechanical transmission. In one example, the transmission system includes a hydrostatic assembly including a variable displacement hydraulic pump and a hydraulic motor and a planetary gearset coupled to a multi-speed gearbox, a hydraulic motor, and an output shaft via separate gears and shafts. In the system the variable displacement hydraulic pump is coupled to an input of the multi-speed gearbox, the multi-speed gearbox includes one or more clutches and is coupled to a prime mover and the output shaft is designed to couple to an axle.
Claims17
A transmission system, comprising:
- a hydrostatic assembly including a variable displacement hydraulic pump and a hydraulic motor;
- and
- a planetary gearset mechanically coupled to a first shaft and mechanically coupled to an output shaft via a first gear;
- an input shaft coupled to a second gear that is mechanically coupled to a second shaft via the second gear that meshes with a third gear;
- wherein the third gear is mechanically coupled to the second shaft;
- wherein the variable displacement hydraulic pump is selectively mechanically coupled to the second shaft via a first clutch that is positioned coaxial to the input shaft;
- wherein the input shaft is mechanically coupled to a prime mover;
- and
- wherein the output shaft is:
- mechanically coupled to an axle;
- and
- selectively coupled to the hydraulic motor via a second clutch that is positioned coaxial to the output shaft;
- a third clutch that is positioned coaxial to the first clutch;
- and
- a fourth clutch positioned coaxial to the second shaft and selectively mechanically coupling the input shaft to the second shaft via a fourth gear.
A hydromechanical variable transmission, comprising:
- a hydrostatic assembly including a variable displacement hydraulic pump and a variable displacement hydraulic motor;
- wherein the variable displacement hydraulic pump is mechanically coupled to a first clutch via a first gear that is positioned coaxial to an input shaft;
- a carrier included in planetary gearset mechanically coupled to an output shaft;
- a third clutch positioned coaxial to the first clutch, wherein the first clutch is a forward drive clutch and the third clutch is a reverse clutch;
- and a fourth clutch positioned coaxial to a second shaft and selectively mechanically coupling the input shaft to the second shaft via a second gear;
- wherein the input shaft is mechanically coupled to a prime mover;
- wherein the input shaft includes the first clutch positioned coaxial thereto and configured to selectively mechanically couple the variable displacement hydraulic pump to [a] the second shaft;
- wherein the output shaft is designed to couple to an axle;
- and wherein the output shaft is selectively coupled to the variable displacement hydraulic motor via a second clutch that is positioned coaxial to the output shaft.
Dependencies are inferred from the claim text.