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 for use in a piece of an appliance includes a drive shaft and a first rotary coupling and a second rotary coupling. When the drive shaft is rotated in a first direction, the first rotary coupling and the second rotary coupling rotate about an axis of the drive shaft at a same speed. When the drive shaft is rotated in a second opposite direction, the first rotary coupling and the second rotary coupling rotate about the axis of said drive shaft at different speeds.

A method to control a power tool, especially a core drill, including a motor as the drive for the power tool, a control unit, a power display, a transmission having at least a first gear and a second gear, a first sensor to detect the rotational speed of at least one component of the transmission and a second sensor to detect the rotational speed of the motor. The method includes the following steps: ascertaining a first rotational speed of the at least one component of the transmission when the transmission has been put into a gear, ascertaining a first rotational speed of the motor when the transmission has been put into a gear, ascertaining the selection of the gear on the basis of a first prescribed ratio of the first rotational speed of the at least one component of the transmission and of the first rotational speed of the motor on the basis of a look-up table, and setting the limit value of the power display on the basis of the look-up table as a function of the gear that has been selected. A power tool for purposes of using the method.

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 vehicle transmission using a gearset. Multi-mode clutches selectively couple components of the gearset. The transmission operates in and shifts between a first forward gear and a second forward gear using a change in input rotation. An electric motor coupled to the input may be used to change the input rotation direction.

A shifting assembly for a transmission at least has a first component, a second component, and a third component, the components interacting according to the shift state in that a friction clutch is arranged between the first component and the second component, a positively-locking clutch is arranged between the second component and the third component, and a freewheel unit is arranged between the second component and the third component. A connection means is provided which connects a clutch part of the friction clutch to a clutch part of the positively-locking clutch.

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 gearbox includes a planetary gear assembly, a first gear assembly, and a second gear assembly. The first gear assembly is engaged to provide a first rotational input to the planetary gear assembly when an input shaft is rotating in a first direction and is disengaged when the input shaft is rotating in a second direction. The second gear assembly provides a second rotational input to the planetary gear assembly when the input shaft is rotating in the first direction and provides a third rotational input to the planetary gear assembly when the input shaft is rotating in the second direction.

A gear ratio mechanism includes an input shaft, a first planetary gear set, a second planetary gear set, and a carrier link associated with an output shaft. The carrier link is configured to couple the first planetary gear set and the second planetary gear set. The carrier link is selectively driven by the first planetary gear set and the second planetary gear set in response to rotation of the input shaft.

The present invention discloses a power transmission apparatus. The power transmission apparatus includes: an input shaft including a male screw portion formed thereon; a pair of input gears formed on the input shaft to be freely rotatable with the male screw portion being interposed therebetween; an output gear formed to be rotatable in a state of being linked with the pair of input gears; and a power interrupting unit screw-coupled to the male screw portion of the input shaft, and configured to rectilinearly reciprocate along the input shaft by a rotation of the input shaft to be selectively engaged with any one of the pair of input gears so as to transmit a power.