A work vehicle reduction drive assembly includes a drive having a drive shaft mechanically linked to a movable work component through a planetary gear train is. The planetary gear train includes a ring gear having a tooth count of T.sub.ring, a sun gear having a tooth count of T.sub.sun, and a planet-carrier assembly including a plurality of planet gears each having a tooth count of T.sub.planet, T.sub.ring, T.sub.sun, and T.sub.planet are selected such that each planet gear in the plurality of planet gears contacts at least two teeth of the sun gear and at least two teeth of the ring gear in all rotational positions of the planetary gear train. The sum of T.sub.ring and T.sub.sun yields a positive integer when divided by a first number from a set {3, 4, 5} and when divided by a second number from the set {3, 4, 5}.

A work vehicle reduction drive assembly includes a drive having a drive shaft mechanically linked to a movable work component through a planetary gear train is. The planetary gear train includes a ring gear having a tooth count of T.sub.ring, a sun gear having a tooth count of T.sub.sun, and a planet-carrier assembly including a plurality of planet gears each having a tooth count of T.sub.planet, T.sub.ring, T.sub.sun, and T.sub.planet are selected such that each planet gear in the plurality of planet gears contacts at least two teeth of the sun gear and at least two teeth of the ring gear in all rotational positions of the planetary gear train. The sum of T.sub.ring and T.sub.sun yields a positive integer when divided by a first number from a set {3, 4, 5} and when divided by a second number from the set {3, 4, 5}.

A combination starter-generator device is provided for a work vehicle having an engine. The starter-generator device includes an electric machine; a gear set configured to couple the electric machine and the engine in first and second power flow directions, the gear set configured to operate in one of at least first, second, and third gear ratios in the first power flow direction and at least a fourth gear ratio in the second power flow direction; at least one clutch selectively coupled to the gear set to effect the first, second, and third gear ratios in the first power flow direction and the fourth gear ratio in the second power flow direction; and an actuator assembly including at least one electromagnet configured to selectively shift the at least one clutch between disengaged and engaged positions.

A combination starter-generator device is provided for a work vehicle having an engine. The starter-generator device includes an electric machine; a gear set configured to couple the electric machine and the engine in first and second power flow directions, the gear set configured to operate in one of at least first, second, and third gear ratios in the first power flow direction and at least a fourth gear ratio in the second power flow direction; at least one clutch selectively coupled to the gear set to effect the first, second, and third gear ratios in the first power flow direction and the fourth gear ratio in the second power flow direction; and an actuator assembly including at least one electromagnet configured to selectively shift the at least one clutch between disengaged and engaged positions.

A combination starter-generator device includes an electric machine and a gear set configured to couple the electric machine and the engine in first and second power flow directions. The gear set is configured to operate in one of at least a first mode, a second mode, or a third mode in the first power flow direction and at least a fourth mode in the second power flow direction. The starter-generator device includes a clutch arrangement with at least one clutch selectively coupled to the gear set to effect the first, second, and third mode in the first power flow direction and the fourth mode in the second power flow direction; and a cam plate configured to shift the at least one clutch between a disengaged position and an engaged position relative to the gear set.

A combination starter-generator device includes an electric machine and a gear set configured to couple the electric machine and the engine in first and second power flow directions. The gear set is configured to operate in one of at least a first mode, a second mode, or a third mode in the first power flow direction and at least a fourth mode in the second power flow direction. The starter-generator device includes a clutch arrangement with at least one clutch selectively coupled to the gear set to effect the first, second, and third mode in the first power flow direction and the fourth mode in the second power flow direction; and a cam plate configured to shift the at least one clutch between a disengaged position and an engaged position relative to the gear set.

An electric drive-unit encased in a housing includes an electric motor, a first output member, and a second output member. The drive-unit also includes first, second, and third planetary gear-sets, each having first, second, and third nodes. The first gear-set has one node connected to the electric motor. The second gear-set has one node connected to the first planetary gear-set, another node connected to the first output member, and the remaining node fixed to the housing. The third gear-set has one node connected to the first gear-set and another node connected to the second output member. The drive-unit additionally includes a first torque-transmitting device configured to selectively connect one third gear-set node to the housing to thereby affect a first speed-ratio. Furthermore, the drive-unit includes a second torque-transmitting device configured to selectively connect one first gear-set node to one of the third gear-set nodes to thereby affect a second speed-ratio.

An electric drive-unit encased in a housing includes an electric motor, a first output member, and a second output member. The drive-unit also includes first, second, and third planetary gear-sets, each having first, second, and third nodes. The first gear-set has one node connected to the electric motor. The second gear-set has one node connected to the first planetary gear-set, another node connected to the first output member, and the remaining node fixed to the housing. The third gear-set has one node connected to the first gear-set and another node connected to the second output member. The drive-unit additionally includes a first torque-transmitting device configured to selectively connect one third gear-set node to the housing to thereby affect a first speed-ratio. Furthermore, the drive-unit includes a second torque-transmitting device configured to selectively connect one first gear-set node to one of the third gear-set nodes to thereby affect a second speed-ratio.

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 engine. The gear set is configured to operate in one of at least a first, second, or third gear ratio in a first power flow direction and at least a fourth gear ratio in a second power flow direction. The starter-generator device further includes at least one clutch selectively coupled to the gear set to effect the gear ratios and an actuation assembly including at least one electromechanical solenoid device configured to selectively shift the at least one clutch from a disengaged position in which the at least one clutch is decoupled from the gear set into an engaged position in which the at least one clutch is coupled to the gear set.

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 engine. The gear set is configured to operate in one of at least a first, second, or third gear ratio in a first power flow direction and at least a fourth gear ratio in a second power flow direction. The starter-generator device further includes at least one clutch selectively coupled to the gear set to effect the gear ratios and an actuation assembly including at least one electromechanical solenoid device configured to selectively shift the at least one clutch from a disengaged position in which the at least one clutch is decoupled from the gear set into an engaged position in which the at least one clutch is coupled to the gear set.