A speed reducer includes a transmission unit rotating around an axis, an annular member having a cylindrical shape surrounding the axis, rotating around the axis together with the transmission unit, and having an oil sump having a recessed groove recessed in an inner peripheral surface and a lubricating oil supply hole extending and opening radially outward from the recessed groove, and a sliding portion provided radially outward of the lubricating oil supply hole of the annular member.

In a brake device of a transmission, rotation side friction plates are engaged with a cylindrical part of a rotation side holding member, and fixed side friction plates are engaged with a spline part that is provided on an outer peripheral surface of an inner cylindrical part of a fixed side holding member opposed to a cylindrical part of the rotation side holding member. The fixed side holding member includes an inflow oil passage that supplies lubricating oil from the outside to the inside of the radial direction thereof. An annular space communicating with an inflow oil passage is provided on the inside of the cylindrical part of the fixed side holding member. Oil discharge holes supplying lubricating oil, which was flowed into the annular space, to the rotation side and fixed side friction plates are provided on the cylindrical part of the fixed side holding member.

Provided is an automatic transmission with a compact arrangement that prevents rotation of a hub member, and efficiently supplies lubrication hydraulic oil to the friction plates. The automatic transmission comprises a brake in which a plurality of friction plates are arranged between the hub member and a drum member, wherein a biasing member, an engagement hydraulic pressure chamber, and a disengagement hydraulic pressure chamber are arranged radially inward of the friction plates at positions radially overlapping each other. The hub member comprises: a first hub member comprising a cylindrical portion having a splined region with which the friction plates are spline-engaged, wherein the first hub member s spline-engaged with a transmission casing; and a second hub member formed with a part of a lubrication oil supply passage, wherein the second hub member is fittingly engaged with the transmission casing such that it is connected to a valve body.

The present disclosure relates to a transmission arrangement. The transmission arrangement comprises at least a first and a second planetary gear set and a first and a second brake mechanism respectively configured to optionally apply a braking torque to a respective member of the respective planetary gear set. Each one of the first and second brake mechanisms comprises a respective brake disc, a normally disengaged brake for acting on the brake disc, and a normally engaged brake for acting on the brake disc.

A system is disclosed for locking and unlocking a rotatable shaft connected to a drive motor. The system includes a fluid actuated lock piston operable to move between locked and unlocked positions to selectively lock the rotatable shaft to a fixed housing.

Methods of modifying a GM Powerglide low range servo assembly for high line pressure applications as well as replacement components for Powerglide low range servo assemblies and replacement low range servo assemblies.

A system is disclosed for locking and unlocking a rotatable shaft connected to a drive motor. The system includes a fluid actuated lock piston operable to move between locked and unlocked positions to selectively lock the rotatable shaft to a fixed housing.

In a brake device of a transmission, rotation side friction plates are engaged with a cylindrical part of a rotation side holding member, and fixed side friction plates are engaged with a spline part that is provided on an outer peripheral surface of an inner cylindrical part of a fixed side holding member opposed to a cylindrical part of the rotation side holding member. The fixed side holding member includes an inflow oil passage that supplies lubricating oil from the outside to the inside of the radial direction thereof. An annular space communicating with an inflow oil passage is provided on the inside of the cylindrical part of the fixed side holding member. Oil discharge holes supplying lubricating oil, which was flowed into the annular space, to the rotation side and fixed side friction plates are provided on the cylindrical part of the fixed side holding member.

An electric drive train for a military vehicle includes an electric motor, and a gearbox. The gearbox is driven by the electric motor and drives a tractive element. The gearbox includes input and output shafts, a pair of clutches, and a pair of planetary gearsets. The input shaft receives torque from the electric motor. The output shaft outputs torque to the tractive element. The first clutch is operable to engage an element of the first planetary gearset and the second clutch is operable to engage an element of the second planetary gearset. The first clutch and the second clutch are operable to engage the element of the first planetary gearset and the second planetary gearset to transition the electric drive train between a park mode, a neutral mode, a first driving mode, and a second driving mode, and to provide braking for the electric drive train.

A military vehicle includes an electric motor, a gearbox, a hydraulic system, and a control system. The gearbox is driven by the electric motor and drives a tractive element. The gearbox includes a first planetary gearset, a second planetary gearset, a first brake, and a second brake. Processing circuitry is configured to obtain one or more control inputs including a brake request or a mode selection. The processing circuitry operates the hydraulic system of the military vehicle to transition the gearbox between a park mode, a neutral mode, a first driving mode, and a second driving mode according to the mode selection. The processing circuitry operates the hydraulic system to provide variable pressurization to a chamber corresponding to one of the first brake or the second brake in order to perform the brake request while operating according to the first driving mode or the second driving mode.