Multi-mode integrated starter-generator device
AssigneeDeere & Company
InventorsSteven R. Fliearman, Lisa R. Lloyd, Jeffrey S. Turner
Life of this patent
Estimating the term…
Abstract
A combination starter-generator device is provided for a work vehicle having an engine. The starter-generator device includes an electric machine; and a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction. The gear set is configured to operate in one of multiple relatively high-torque, low-speed start gear ratios in the first power flow direction and a relatively low-torque, high-speed gear ratio in the second power flow direction.
Claims18
A combination starter-generator device for a work vehicle having an engine, the starter-generator device comprising:
- an electric machine;
- and
- a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in one of multiple high-torque, low-speed start gear ratios in the first power flow direction and a low-torque, high-speed gear ratio in the second power flow direction;
- wherein the multiple start gear ratios include a first start gear ratio greater than a second start gear ratio;
- and
- wherein the first start gear ratio corresponds to a cold engine start mode of the starter-generator device and the second start gear ratio corresponds to a warm engine start mode of the starter-generator device.
A combination starter-generator device for a work vehicle having an engine, the starter-generator device comprising:
- an electric machine;
- and
- a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in one of multiple high-torque, low-speed start gear ratios in the first power flow direction and a low-torque, high-speed gear ratio in the second power flow direction;
- wherein the gear set includes a compound epicyclic gear train including first-stage and second-stage sun gears, first-stage and second-stage planet gears, first-stage and second-stage carriers, and a ring gear;
- and
- wherein the first-stage planet gears have a different tooth count than the second-stage planet gears.
A drivetrain assembly for a work vehicle, comprising:
- an engine;
- an electric machine;
- and
- a gear set configured to receive rotational input from the electric machine and from the engine and to couple the electric machine and the engine in a first power flow direction and a second power flow direction, the gear set configured to operate in one of multiple high-torque, low-speed start gear ratios in the first power flow direction and a low-torque, high-speed gear ratio in the second power flow direction;
- wherein the gear set includes a compound epicyclic gear train including first-stage and second-stage sun gears, first-stage and second-stage planet gears, first-stage and second-stage carriers, and a ring gear;
- wherein the first-stage planet gears have a different tooth count than the second-stage planet gears;
- and
- wherein rotational power from the electric machine moves in the first power flow direction from the first-stage sun gear to the ring gear to the engine, and rotational power from the engine moves in the second power flow direction from the ring gear to the first-stage sun gear to the electric machine.
Dependencies are inferred from the claim text.