Hydromechanical transmission and control method
AssigneeDana Italia S.R.L.
InventorsGiovanni PROFUMO, Lorenzo DALLA PALMA
Life of this patent
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Abstract
Methods and systems for a hydromechanical transmission are provided herein. In one example, the transmission system includes a hydraulic pump and a hydraulic motor rotationally coupled in parallel with a first planetary gear set and a second planetary gear set. In the system, sun gears of the planetary gear sets are rotationally coupled to the hydraulic motor, a carrier of the first planetary gear set is rotationally coupled to a first clutch and a second clutch, and a ring gear of the second planetary gear set is rotationally coupled to a third clutch.
Claims20
A transmission for a vehicle, comprising:
- a hydraulic pump and a hydraulic motor mechanically coupled to a first planetary gear set and a second planetary gear set;
- wherein sun gears of the first and second planetary gear sets are mechanically coupled to the hydraulic motor;
- and
- wherein a carrier of the second planetary gear set is mechanically coupled to the hydraulic pump.
A hydromechanical variable transmission comprising:
- a hydrostatic assembly mechanically coupled in parallel with a first planetary gear set and a second planetary gear set;
- wherein the hydrostatic assembly include a hydraulic pump and a hydraulic motor that are hydraulically coupled in parallel with one another;
- wherein a sun gear of the first planetary gear set is mechanically coupled to the hydraulic motor;
- wherein a sun gear of the second planetary gear set is mechanically coupled to the hydraulic pump;
- and
- wherein the hydromechanical variable transmission has asymmetric forward and reverse drive ranges.
A power split transmission in a vehicle, comprising:
- a hydrostatic assembly mechanically coupled in parallel with a first planetary gear set and a second planetary gear set;
- wherein the hydrostatic assembly include a hydraulic pump and a hydraulic motor that are hydraulically coupled in parallel with one another;
- wherein a sun gear of the first planetary gear set is mechanically coupled to the hydraulic motor;
- wherein a sun gear of the second planetary gear set is mechanically coupled to the hydraulic pump;
- wherein the power split transmission has asymmetric forward and reverse drive ranges;
- wherein a carrier of the first planetary gear set is mechanically coupled to a first clutch;
- and
- wherein the carrier of the first planetary gear set is mechanically coupled to a second clutch.
Dependencies are inferred from the claim text.