Variable speed transmission and system using same
AssigneeNuovo Pignone Tecnologie Srl
InventorsGianluca BOCCADAMO, Giuliano MILANI
Life of this patent
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Abstract
The system includes: a driver; a rotating load configured to be driven into rotation by the driver; a controller, for controllably changing a rotation speed of the load; and a variable speed transmission, arranged between the driver and the load. The variable speed transmission includes a speed summing gear arrangement with a first input shaft, a second input shaft and an output shaft. The output shaft is drivingly coupled to the rotating load. The first input shaft is drivingly coupled to the driver. A continuous variable transmission device is mechanically coupled to the driver and to the second input shaft of the speed summing gear arrangement. The continuous variable transmission device is functionally coupled to the controller.
Claims13
A system comprising:
- a constant-speed driver;
- a rotating load configured to be driven into rotation by the constant-speed driver;
- a controller, for controllably changing a rotation speed of the load;
- and
- a variable speed transmission, arranged between the constant-speed driver and the load;
- wherein the variable speed transmission comprises a speed summing gear arrangement with a first input shaft, a second input shaft and an output shaft;
- wherein the output shaft is drivingly coupled to the rotating load;
- wherein the first input shaft is drivingly coupled to the constant-speed driver;
- wherein the speed of the output shaft is a function of the speeds of the first input shaft and of the second input shaft;
- wherein a continuous variable transmission device is mechanically coupled to the constant-speed driver and configured to modify the speed of the second input shaft of the speed summing gear arrangement;
- and
- wherein the continuous variable transmission device is functionally coupled to the controller, such that the rotation speed of the load drivingly coupled to the output shaft can be modulated, while the rotation speed of the constant-speed driver remains constant.
A method for operating a variable-speed rotating load, comprising:
- driving the rotating load with a constant-speed driver through a speed summing gear arrangement comprised of a first input shaft, a second input shaft and an output shaft;
- wherein the first input shaft is drivingly coupled to the constant-speed driver, the output shaft is drivingly coupled to the load;
- and
- the speed of the output shaft is a function of the speeds of the first input shaft and of second input shaft varying the speed of the rotating load by transmitting a fraction of power from the constant-speed driver through a continuous variable transmission device mechanically coupled to the constant-speed driver and to the second input shaft of the speed summing gear arrangement.
Dependencies are inferred from the claim text.