An Electric Tag Axle has a differential connected to two axle shafts. A two speed gearbox is connected to the differential by way of a ring and pinion gear. A longitudinally arranged electric motor/generator is connected to the two speed gearbox. A single wheel disconnect mechanism within the axle allows for neutral operation by allowing the differential to freewheel. A vehicle energy management system is connected to the Electric Tag Axle and to a traction battery pack, and is configured to operate the Electric Tag Axle in a low range motoring mode, a high range motoring mode, a regenerative braking mode, and in the neutral mode. This allows the Electric Tag Axle are able to efficiently make use of a limited amount of stored electrical energy during vehicle takeoff, while efficiently supplementing propulsion power during motoring at cruise speeds, and while efficiently recapturing kinetic energy during regenerative braking.

A drill head for a rotation drilling rig, including: a rotation motor, a drill head spindle, and a gear change transmission between the rotation motor and the drill head spindle, the gear change transmission including an input shaft connected to the rotation motor and an output shaft connected to the drill head spindle. The input shaft is co-axial with the output shaft, the input shaft is permanently coupled to an intermediate shaft over a first speed reduction gear couple, the gear change transmission) includes a clutch being shiftable between a first position interconnecting the input and output shafts for obtaining the same rotational speed for the input and output shafts, and a second position connecting the intermediate shaft to the output shaft over a second speed reduction gear couple. The invention also relates to a rig.

A drill head for a rotation drilling rig, including: a rotation motor, a drill head spindle, and a gear change transmission between the rotation motor and the drill head spindle, the gear change transmission including an input shaft connected to the rotation motor and an output shaft connected to the drill head spindle. The input shaft is co-axial with the output shaft, the input shaft is permanently coupled to an intermediate shaft over a first speed reduction gear couple, the gear change transmission) includes a clutch being shiftable between a first position interconnecting the input and output shafts for obtaining the same rotational speed for the input and output shafts, and a second position connecting the intermediate shaft to the output shaft over a second speed reduction gear couple. The invention also relates to a rig.

A drive transmission mechanism includes a first gearbox including a driving source, a first gear train, a first frame configured to support one ends of a plurality of shafts of the first gear train, and a first gear cover configured to support the other ends of the shafts of the first gear train, wherein the first gear box is configured to transmit a driving force from the driving source; and a second gearbox including a second gear train, a second frame configured to support one ends of a plurality of shafts of the second gear train, and a second gear cover configured to support the other ends of the shafts of the second gear train, wherein the second gearbox is configured to receive the driving force from the driving source through the first gear train and configured to transmit the driving force. The second gearbox is fixed to the first gearbox.

A drive transmission mechanism includes a first gearbox including a driving source, a first gear train, a first frame configured to support one ends of a plurality of shafts of the first gear train, and a first gear cover configured to support the other ends of the shafts of the first gear train, wherein the first gear box is configured to transmit a driving force from the driving source; and a second gearbox including a second gear train, a second frame configured to support one ends of a plurality of shafts of the second gear train, and a second gear cover configured to support the other ends of the shafts of the second gear train, wherein the second gearbox is configured to receive the driving force from the driving source through the first gear train and configured to transmit the driving force. The second gearbox is fixed to the first gearbox.

An electric drive axle with an electric motor having a motor shaft that is rotatable about an axis, a differential, and a transmission. The transmission transmits rotary power between the motor shaft and the differential. The multi-speed reduction has an input shaft and at least three on-axis gears. The input shaft is rotatably coupled to the motor shaft. Each of the at least three on-axis gears is co-axial with the input shaft and is rotatable relative to the input shaft in at least one of a first speed ratio and a second speed ratio. The input shaft is axially movable along the axis between a first position, in which a first one of the at least three on-axis gears is rotationally coupled to the input shaft, and a second position in which a second one of the at least three on-axis gears is rotationally coupled to the input shaft.

An electric drive axle with an electric motor having a motor shaft that is rotatable about an axis, a differential, and a transmission. The transmission transmits rotary power between the motor shaft and the differential. The multi-speed reduction has an input shaft and at least three on-axis gears. The input shaft is rotatably coupled to the motor shaft. Each of the at least three on-axis gears is co-axial with the input shaft and is rotatable relative to the input shaft in at least one of a first speed ratio and a second speed ratio. The input shaft is axially movable along the axis between a first position, in which a first one of the at least three on-axis gears is rotationally coupled to the input shaft, and a second position in which a second one of the at least three on-axis gears is rotationally coupled to the input shaft.

An electric drive axle with an electric motor having a motor shaft that is rotatable about an axis, a differential, and a transmission. The transmission transmits rotary power between the motor shaft and the differential. The multi-speed reduction has an input shaft and at least three on-axis gears. The input shaft is rotatably coupled to the motor shaft. Each of the at least three on-axis gears is co-axial with the input shaft and is rotatable relative to the input shaft in at least one of a first speed ratio and a second speed ratio. The input shaft is axially movable along the axis between a first position, in which a first one of the at least three on-axis gears is rotationally coupled to the input shaft, and a second position in which a second one of the at least three on-axis gears is rotationally coupled to the input shaft.

A gear box includes an output shaft defining multiple output drivers and includes a plurality of gear sets having the same diametral pitch. A common input shaft is operatively attached to each of the plurality of gear sets such that the gear sets rotate continuously and concurrently with rotation of the input shaft. Each of the output drivers is operatively attached to the output shaft and rotatably driven by a respective one of the plurality of gear sets. The multiple output drivers share a common axis of rotation with the output shaft. The output speed of the gear box may be changed by disconnecting one of the output drivers from a driven device and reconnecting another one of the output drivers to the driven device. The output speed of the gear box may be changed without having to disengage and/or change out any of the gears in the gear box.

A gear box includes an output shaft defining multiple output drivers and includes a plurality of gear sets having the same diametral pitch. A common input shaft is operatively attached to each of the plurality of gear sets such that the gear sets rotate continuously and concurrently with rotation of the input shaft. Each of the output drivers is operatively attached to the output shaft and rotatably driven by a respective one of the plurality of gear sets. The multiple output drivers share a common axis of rotation with the output shaft. The output speed of the gear box may be changed by disconnecting one of the output drivers from a driven device and reconnecting another one of the output drivers to the driven device. The output speed of the gear box may be changed without having to disengage and/or change out any of the gears in the gear box.