A modular transmission assembly facilitates its use in all classes of trucks. The transmission is designed to receive one, two or three inputs. In addition, it can add torque multiplying gearsets when needed. The transmission assembly utilizes two gearsets configured in ring-carrier/ring-carrier configuration to operate as a four-node transmission. Two input shafts are coaxial with one inside the other (input shaft 1 inside input shaft 2) allowing torque from the second input to be received directly at the output shaft of the transmission. The transmission includes two controllable clutches coupling the second input with the two gearsets. Two controllable brakes selectively couple various gears of the gearsets to ground. Controlling the clutches and brakes controls the torque of the output shaft as a function of torques received by the first and second input shafts.

A modular transmission assembly facilitates its use in all classes of trucks. The transmission is designed to receive one, two or three inputs. In addition, it can add torque multiplying gearsets when needed. The transmission assembly utilizes two gearsets configured in ring-carrier/ring-carrier configuration to operate as a four-node transmission. Two input shafts are coaxial with one inside the other (input shaft 1 inside input shaft 2) allowing torque from the second input to be received directly at the output shaft of the transmission. The transmission includes two controllable clutches coupling the second input with the two gearsets. Two controllable brakes selectively couple various gears of the gearsets to ground. Controlling the clutches and brakes controls the torque of the output shaft as a function of torques received by the first and second input shafts.

Provided is an automatic transmission capable of smoothly switching a switching mechanism. A control part ECU of a transmission recognizes an input torque and a friction torque when an instruction to switch a two-way clutch from a fixed state to a reverse rotation prevention state is received while a first clutch, a second clutch and a third clutch are in an open state, and switches the two-way clutch from the fixed state to the reverse rotation prevention state when the input torque is equal to or greater than the friction torque.

An epicyclic gear train includes a housing, an input shaft, a first sun gear fixedly connected to the input shaft, an output shaft, a second sun gear fixedly connected to the output shaft, a planetary gear carrier arranged to be movable with respect to the first and second sun gears, and first and second planetary gears arranged to move on the planetary gear carrier. The planetary gears are fixedly connected to one another and disposed in engagement with the first and second sun gears, The epicyclic gear train further includes a first clutch device is disposed between the planetary gear carrier and the first sun gear, and a second clutch device is disposed between the housing and the planetary gear carrier. The first and second clutch devices block a relative movement between the planetary gear carrier and the first sun gear or between the planetary gear carrier and the housing.

An automatic two-mode high reduction power transmission system. A power transmission system includes a first device that delivers a first input and receives a second output. A second device delivers a second input and receives a first output. A power transmission has two planetary gear sets and operates in a first mode at a first speed ratio, where the first input is received from the first device and in response, the first output is delivered to the second device. The power transmission operates in a second mode at a second speed ratio that is different than the first speed ratio, where the second input is received from the second device and in response, the second output is delivered to the first device. A pair of freewheel mechanisms automatically couple one of the first or second devices with the power transmission to provide the two modes.

An automatic two-mode high reduction power transmission system. A power transmission system includes a first device that delivers a first input and receives a second output. A second device delivers a second input and receives a first output. A power transmission has two planetary gear sets and operates in a first mode at a first speed ratio, where the first input is received from the first device and in response, the first output is delivered to the second device. The power transmission operates in a second mode at a second speed ratio that is different than the first speed ratio, where the second input is received from the second device and in response, the second output is delivered to the first device. A pair of freewheel mechanisms automatically couple one of the first or second devices with the power transmission to provide the two modes.

Provided herein is a transmission system including: a housing; a pair of double-layered gears for transmitting a power from a motor to a screw driver shaft defining a transmission axis, the pair of gears including a first bigger gear and a first smaller gear; a torque cup for covering a leading end portion of the housing through which the shaft is extended from the housing; a first set of planetary gears for driving the shaft, regularly surrounding and meshing the first smaller gear; and a first ring gear for sliding axially against the housing and meshing the first bigger gear and/or the first set of planetary gears; wherein the torque cup can be turned to force the first ring gear to slide axially.

Provided herein is a transmission system including: a housing; a pair of double-layered gears for transmitting a power from a motor to a screw driver shaft defining a transmission axis, the pair of gears including a first bigger gear and a first smaller gear; a torque cup for covering a leading end portion of the housing through which the shaft is extended from the housing; a first set of planetary gears for driving the shaft, regularly surrounding and meshing the first smaller gear; and a first ring gear for sliding axially against the housing and meshing the first bigger gear and/or the first set of planetary gears; wherein the torque cup can be turned to force the first ring gear to slide axially.

Provided herein is a transmission system including: a housing; a pair of double-layered gears for transmitting a power from a motor to a screw driver shaft defining a transmission axis, the pair of gears including a first bigger gear and a first smaller gear; a torque cup for covering a leading end portion of the housing through which the shaft is extended from the housing; a first set of planetary gears for driving the shaft, regularly surrounding and meshing the first smaller gear; and a first ring gear for sliding axially against the housing and meshing the first bigger gear and/or the first set of planetary gears; wherein the torque cup can be turned to force the first ring gear to slide axially.

Provided herein is a transmission system including: a housing; a pair of double-layered gears for transmitting a power from a motor to a screw driver shaft defining a transmission axis, the pair of gears including a first bigger gear and a first smaller gear; a torque cup for covering a leading end portion of the housing through which the shaft is extended from the housing; a first set of planetary gears for driving the shaft, regularly surrounding and meshing the first smaller gear; and a first ring gear for sliding axially against the housing and meshing the first bigger gear and/or the first set of planetary gears; wherein the torque cup can be turned to force the first ring gear to slide axially.