A planetary carrier includes a plurality of pinion gears, a plurality of pinion shafts that are each inserted in the corresponding pinion gear, a first supporting plate that supports one end of each of the pinion shafts, a second supporting plate that supports the other end of each of the pinion shafts, and a plurality of bridge plates, one end of each of which is joined to the first supporting plate via a welding portion and the other end of each of which is joined to the second supporting plate via a welding portion and which connects the first and second supporting plates.

A transmission (G) for a motor vehicle. The transmission (G) has a drive shaft (GW1), an output shaft (GW2-A), first, second, third and fourth planetary gearsets (P1, P2, P3, P4) and first, second, third, fourth, fifth and sixth shift elements (B1, K1, K2, B2, K3, K4). Selective actuation of the six shift elements (B1, K1, K2, B2, K3, K4) implements eleven forward gears and two reverse gears between the drive shaft (GW1) and the output shaft (GW2-A). A drive train for a motor vehicle having such a transmission (G) is also disclosed.

A transmission (G) for a motor vehicle. The transmission (G) has a drive shaft (GW1), an output shaft (GW2-A), first, second, third and fourth planetary gearsets (P1, P2, P3, P4) and first, second, third, fourth, fifth and sixth shift elements (B1, K1, K2, B2, K3, K4). Selective actuation of the six shift elements (B1, K1, K2, B2, K3, K4) implements eleven forward gears and two reverse gears between the drive shaft (GW1) and the output shaft (GW2-A). A drive train for a motor vehicle having such a transmission (G) is also disclosed.

An automatic transmission includes: first, second, and third planetary gear sets each having three rotating elements; seven coupling elements variably providing a frictional force; and seven shafts. In particular, a first shaft is fixedly connected to a second rotating element of the third planetary gear set and an input shaft, a third shaft is fixedly connected to a third rotating element of the second planetary gear set, a fourth shaft is fixedly connected to a first rotating element of the second planetary gear set and a third rotating element of the third planetary gear set, a sixth shaft is directly connected to a first rotating element of the third planetary gear set and a transmission casing, a seventh shaft is fixedly connected to a third rotating element of the first planetary gear set and an output shaft, and remaining two shafts are selectively fixed to the transmission casing.

An automatic transmission includes: first, second, and third planetary gear sets each having three rotating elements; seven coupling elements variably providing a frictional force; and seven shafts. In particular, a first shaft is fixedly connected to a second rotating element of the third planetary gear set and an input shaft, a third shaft is fixedly connected to a third rotating element of the second planetary gear set, a fourth shaft is fixedly connected to a first rotating element of the second planetary gear set and a third rotating element of the third planetary gear set, a sixth shaft is directly connected to a first rotating element of the third planetary gear set and a transmission casing, a seventh shaft is fixedly connected to a third rotating element of the first planetary gear set and an output shaft, and remaining two shafts are selectively fixed to the transmission casing.

A power-split transmission comprises an electric variator (9) and an electric variator (10) which can be connected, by way of a clutch (8), for forward driving, and a clutch (7), for reverse driving, to the drive output shaft (5) in such manner that the drive output shaft (5) can be purely electrically driven even when the input shaft (2) is static.

A power-split transmission comprises an electric variator (9) and an electric variator (10) which can be connected, by way of a clutch (8), for forward driving, and a clutch (7), for reverse driving, to the drive output shaft (5) in such manner that the drive output shaft (5) can be purely electrically driven even when the input shaft (2) is static.

A transport apparatus includes: a driving source; an output shaft; and a power transmission device capable of performing power transmission between the driving source and the output shaft. The transport apparatus comprises a control device which controls the driving source and the power transmission device, wherein the power transmission device includes a connecting/disconnecting unit configured to control a fastened state in which the power transmission is performed, and a released state in which the power transmission is not performed, and wherein the control device controls the connecting/disconnecting unit based on a thermal history of the connecting/disconnecting unit.

A planetary gear assembly includes a wheel hub surrounding an axis, and having an end face and a plurality of engaging recesses formed in the end face, and a planetary gear reduce mechanism including a sun gear disposed on and rotatable about the axis, a plurality of planet gears, and first and second ring gears. The planet gears angularly surround the sun gear and mesh with the sun gear and the first and second ring gears. The first ring gear is stationary relative to the planet gears. The second ring gear is arranged between the wheel hub and the first ring gear along the axis. The second ring gear includes a wheel-hub-facing face surrounding the axis and facing the end face, and a plurality of joining protrusions disposed on the wheel-hub-facing face and respectively complementary in shape with and respectively engage the engaging recesses.

A planetary gear assembly includes a wheel hub surrounding an axis, and having an end face and a plurality of engaging recesses formed in the end face, and a planetary gear reduce mechanism including a sun gear disposed on and rotatable about the axis, a plurality of planet gears, and first and second ring gears. The planet gears angularly surround the sun gear and mesh with the sun gear and the first and second ring gears. The first ring gear is stationary relative to the planet gears. The second ring gear is arranged between the wheel hub and the first ring gear along the axis. The second ring gear includes a wheel-hub-facing face surrounding the axis and facing the end face, and a plurality of joining protrusions disposed on the wheel-hub-facing face and respectively complementary in shape with and respectively engage the engaging recesses.