A cam device having a drive cam and a driven cam; and a friction engagement device having at least one friction plate and at least one separation plate are provided. The friction engagement device is configured so as to be put into a connected state by pressing the friction plate and the separation plate against each other by the driven cam, and a disconnected state. Also provided are a rotation transmission state switching device having a first member and a second member coaxially arranged, and a mode selecting part configured to rotate or displace in the axial direction according to rotation of the drive cam. The rotation transmission state switching device has at least one mode of a free mode and a lock mode of the first member and the second member, and a one-way clutch mode.

A hydraulic pressure control device of a vehicle driving device, the hydraulic pressure control device includes a range switcher having a first signal solenoid valve capable of supplying a first signal pressure and a spool switchable between a first position reached via the first signal pressure and a second position reached via a biasing force of a biasing member.

In a drive mechanism, a two-stage gear has an input gear and a sun gear. A planetary gear is engaged with both of outer teeth of the sun gear and inner teeth of a ring gear. A carrier, which is capable of rotating together with a rotational shaft, supports the planetary gear, and outputs drive force. A drive force transmission switching member switches between a connecting state connecting the two-stage gear and the carrier such that they rotate together via the rotational shaft, and a separating state separating the two-stage gear and carrier such that they rotate relative to each other. A one-way clutch allows the ring gear to rotate in one of a pair of opposite directions about the central axis of the rotational shaft, and prohibits the ring gear from rotating in the other one of the pair of opposite directions.

In a drive mechanism, a two-stage gear has an input gear and a sun gear. A planetary gear is engaged with both of outer teeth of the sun gear and inner teeth of a ring gear. A carrier, which is capable of rotating together with a rotational shaft, supports the planetary gear, and outputs drive force. A drive force transmission switching member switches between a connecting state connecting the two-stage gear and the carrier such that they rotate together via the rotational shaft, and a separating state separating the two-stage gear and carrier such that they rotate relative to each other. A one-way clutch allows the ring gear to rotate in one of a pair of opposite directions about the central axis of the rotational shaft, and prohibits the ring gear from rotating in the other one of the pair of opposite directions.

An axle center transmission for transmitting a driving torque received from a drive device to two half shafts of an axle of a vehicle comprises a transmission gearing for transmitting a driving torque received at an input element and having at least two selectively switchable gear transmission ratios and a differential for distributing the transmitted driving torque to two output elements. The transmission gearing has a first gear that is formed as a planetary transmission and comprises a first sun gear, a first planet carrier having one or more planet gears, and a first annulus gear. The transmission gearing furthermore has a second gear that is formed as a planetary transmission and comprises a second sun gear, a second planet carrier having one or more planet gears, and a second annulus gear. The first sun gear forms said input element; the first planet carrier is stationary; and the second sun gear is couplable or coupled to the first annulus gear for a common rotation.

A number of variations may include a product comprising an electrical machine operatively connected to a driveline module comprising a gear train having a fixed gear ratio, a first planetary gear set having multiple gear ratios operatively connected to the gear train, a second planetary gear set having a fixed gear ratio operatively connected to the first planetary gear set, and a synchronizer, wherein the synchronizer is operatively connected to the first planetary gear set and is positioned between the first and second planetary gear set; a differential operatively connected to the second planetary gear set; wherein the electrical machine selectively transmits power to the differential through the gear train, the first planetary gear set, the synchronizer, and the second planetary gear set, and wherein the synchronizer is constructed and arranged to shift the driveline module into a high range mode, a low range mode, and a neutral mode.

The present invention relates to a two-speed transmission for an electric driving vehicle and the two-speed transmission for an electric vehicle has only one actuator. The transmission comprises a planetary gear mechanism (12), an elastic body (44), an armature (26) to integrally rotate with an input axis, an electromagnetic coil (46) and a multi-plate friction clutch (30). A ring gear (20) is fixed to a housing. The armature (26) comprises clutch projection portions (26-1). A dog clutch is constituted by the clutch projection portions (26-1) and recess portions (18-2) of a sun gear (18). When the electromagnetic coil (46) is not electrically energized, the dog clutch is engaged. The rotation of the input axis is reduced and is transmitted to an output axis via the sun gear (18) and a carrier (16). When the electromagnetic coil (46) is electrically energized, the armature (26) is displaced against elastic force, the dog clutch becomes a non-engaging state, a multi-plate friction clutch (30) becomes an engaging state by pressing flange portions (26-4) of the armature (26) and the rotation of the input axis is transmitted to the output axis with a one-to-one relationship. The transmission can comprise a one-way clutch to prevent torque interruption when switching the gear ratio.

A turbomachine dual spool transmission system can include a transmission assembly configured to connect to a combination output of a dual spool differential at a transmission input to be driven by the combination output to turn a transmission output. The transmission assembly can be configured to provide a first output gear ratio in a first state and a second output gear ratio in a second state. The system can include the dual spool differential. The dual spool differential can include a gear assembly configured to combine a low pressure spool input and a high pressure spool input into a combination output to provide an output speed range smaller than a low pressure speed range alone.

A gearbox for vehicles that include a split gearbox, a main gearbox and a range gearbox. The range gearbox is shiftable into a low range gear, a high range gear and a reverse gear. The range gearbox includes a planetary gear, which may be shifted into a reverse gear. The split gearbox and the main gearbox are together arranged to have a combined ratio spread larger than 5, in that the split gearbox and the main gearbox are together arranged to have a combined largest gear ratio over 4:1, and in that the planetary gear in the range gearbox has a gear ratio less than 4:1 when shifted into the reverse gear.

The invention relates to a transmission (100) for a hybrid drive arrangement which can be coupled to two drive assemblies (7, 8), comprising an input shaft (10) and an output shaft (11), at least one first, second, third, fourth, fifth, sixth and seventh shifting element (SE1, SE2, SE3, SE4, SE5, SE6, SE7), and at least one planetary gear (5). The input shaft can be coupled to a first transmission shaft (16) by means of the first shifting element (SE1) and the input shaft can be coupled to a second transmission shaft (17) by means of the second shifting element (SE2), and the first transmission shaft (16) can be coupled to the second transmission shaft (17) by means of the third shifting element (SE3), and the first transmission shaft (16) can be coupled to the sun gear of the planetary gear (5) by means of the fourth shifting element (SE4), the first transmission shaft (16) can be coupled to the ring gear of the planetary gear (5) by means of the fifth transmission shaft (SE5), the second transmission shaft (17) can be coupled to the planet carrier of the planetary gear (5) by means of the sixth shifting element (SE6) and the second transmission shaft (17) can be coupled to the sun gear of the planetary gear (5) by means of the seventh shifting element (SE7), the output shaft (11) being coupled to the planet carrier of the planetary gear (5).