A gas turbine engine includes a fan drive turbine driving a fan rotor through a main gear reduction. A primary lubricant system supplies lubricant to the main gear reduction. An auxiliary oil pump supplies oil to the main gear reduction. An auxiliary pump epicyclic gear train drives the auxiliary pump when the fan rotor is rotating in either direction. The main gear reduction is separate from the auxiliary pump epicyclic gear train.

A drive system having eCVT functionality with AMT cost advantages includes a transmission having a plurality of different operating modes. The system includes a transmission output shaft, a stationary member and a gear set including first, second, and third elements. The first element connects with the transmission output shaft. An output shaft of a non-electric power plant connects with the first element through the second element for driving the first element. A drive shaft of an electric power plant connects with the first element through the third element for driving the first element. The system includes a plurality of non-friction, controllable, coupling assemblies. A first coupling assembly has a first coupling state for grounding the second element to the stationary member, a second coupling state for grounding the third element to the stationary member and an uncoupling state to allow the second and third elements to drive the first element.

In an actuator having a reversible motor before a step-down gear, this can be optimized kinetically, geometrically and in terms of material engineering when different step-down ratios become active according to the different torque requirement for application and for release, in a manner dependent on direction of rotation, for example of a parking brake operated by an electric motor. For this purpose, two differently dimensioned idler wheels of the step-down gears that mesh, for example, with a stepped motor pinion, act via freewheels acting in opposite directions on a common gear shaft. Depending on direction of rotation of the motor, the gear shaft thereby rotates at different rpms, delivering correspondingly different torques.

A transmission comprising an input shaft connectable to a power generation device such that the input shaft is rotatable at a power input rotational speed, an output shaft connectable to a driveline of the vehicle, and a plurality of gear sets selectable to operably connect the input shaft to the output shaft providing a rotational speed reduction ratio therebetween. The gear sets comprise a master active gear set having a master gear ratio, a slave active gear set having a slave gear ratio, and a passive gear set having a passive gear ratio. The passive gear set is operable to selectively engage the master and slave active gear sets to provide the high numeric compound ratio rotational speed reduction that is the product of the master active gear ratio, the slave active gear ratio and the passive gear ratio.

A self-ventilated bi-directional traction drive unit (10) comprises a bi-directional motor (12), an asymmetric fan (14) for ventilating the motor (12), and a mechanical transmission (14) between a motor shaft (24) of the motor (12) and an asymmetric fan rotor (38) of the fan (14). The mechanical transmission (14) is operative to drive the fan rotor (38) in a preferred fan direction (102) with a first constant gear ratio Ri when the motor shaft (24) rotates in a first traction direction and to drive the fan rotor (38) in the preferred fan direction with a second constant gear ratio R2 when the motor shaft (24) rotates in a second traction direction opposite to the first traction direction. The mechanical transmission (14) includes a planetary gear train (28) comprising a sun gear (30), a sun gear (32) and a set of one or more planet gears (34) supported on at least one planet carrier (36) and further includes free wheels (40, 42, 44, 46, 48, 50, 52), A first (46) of the free wheels operates between the planet carrier (36) and the fan rotor (38) to block the rotation of the fan rotor (38) with respect to the planet carrier (36) in a direction opposite to the preferred fan direction and a second (50) of the free wheels operates between the ring gear (32) and the fan rotor (38) to block the rotation of the fan rotor (38) with respect to the ring gear (32) in the preferred fan direction and in that the mechanical transmission (14) is such that (I).

A combination engine starter and electric power generator device for a work vehicle has an electric machine and a gear set mounted to the electric machine. The gear set is configured to receive rotational input from the electric machine and from the work vehicle engine. The gear set mechanically couples the electric machine and the engine in first and second power flow directions in which in the first power flow direction the gear set effects a first gear ratio and in the second power flow direction the gear set effects a second gear ratio.

A transmission comprising an input shaft connectable to a power generation device such that the input shaft is rotatable at a power input rotational speed, an output shaft connectable to a driveline of the vehicle, and a plurality of gear sets selectable to operably connect the input shaft to the output shaft providing a rotational speed reduction ratio therebetween. The gear sets comprise a master active gear set having a master gear ratio, a slave active gear set having a slave gear ratio, and a passive gear set having a passive gear ratio. The passive gear set is operable to selectively engage the master and slave active gear sets to provide the high numeric compound ratio rotational speed reduction that is the product of the master active gear ratio, the slave active gear ratio and the passive gear ratio.

An electric vehicle drive apparatus includes a first motor, a second motor, a speed change mechanism coupled to the first motor and the second motor, and a controller controlling operation of the first motor and the second motor. The speed change mechanism includes a first planetary gear mechanism, a second planetary gear mechanism, and a one-way clutch that limits a rotation direction of a first carrier of the first planetary gear mechanism to a certain forward rotation direction. When rotating the first motor in a backward rotation direction opposite to the certain forward rotation direction and rotating the second motor in the forward rotation direction, the controller determines rotation speeds of the first motor and the second motor within a range indicated by Expression (1).

An electric motor comprises: a stator; a rotor having a rotor shaft; and a transmission coupled to the rotor shaft, wherein when the rotor shaft rotates in a first direction an output shaft of the transmission rotates in a second direction opposite to the first direction with a first gear ratio, and wherein when the rotor shaft rotates in the second direction the output shaft of the transmission rotates in the second direction with a second gear ratio different from the first gear ratio.

A combination engine starter and electric power generator device for a work vehicle has an electric machine and a gear set mounted to the electric machine. The gear set is configured to receive rotational input from the electric machine and from the work vehicle engine. The gear set mechanically couples the electric machine and the engine in first and second power flow directions in which in the first power flow direction the gear set effects a first gear ratio and in the second power flow direction the gear set effects a second gear ratio.