Provided is a structure for lubricating a clutch, the structure including: an oil capturing groove provided along an inner circumference of a ring gear at one side of a pinion gear; and an oil hole connected to an inside of a clutch hub through the oil capturing groove.

An automatic transmission includes: a frictional engagement element including first and second annular friction plates; a pressing member moving in the axial direction relative to the transmission case and press the frictional engagement element in the axial direction; and a lubricating oil. Further, the transmission case includes a contact portion on the inner wall so that the contact portion is separated from a back surface of the pressing member when the frictional engagement element is in an engagement state and comes into contact with the back surface of the pressing member when the frictional engagement element is in a disengagement state.

A gear assembly comprises an axle defining an axis of rotation, a gear mounted to the axle for rotation relative to the axle about the axis of rotation, a pin, and a thrust washer disposed axially adjacent to the gear. The pin is disposed in a portion of the thrust washer and extends into the axle.

Disclosed is a support structure for a ring gear (32), which includes: a clutch drum (6) coupled by spline fitting with the ring gear (32); and first and second snap rings (38, 39) mounted to a circumferential wall (62) of the clutch drum (6) and supporting the ring gear (32). The first snap ring (38) is positioned so as not to overlap with the ring gear (32) in a radial direction. The second snap ring (39) is positioned so as to overlap with the ring gear (32) in the radial direction. A length (a1) of the first snap ring (38) in the radial direction is longer than a length (a2) of the second snap ring (39) in the radial direction.

A kit for modifying an OE vehicle transmission includes a replacement forward piston housing, forward clutch hub and a forward clutch and a replacement direct piston housing, direct clutch hub and a direct clutch. A drum extends between and operably connects the replacement forward piston housing and direct piston housing. The kit includes a replacement sprag shaft. The forward clutch hub and forward clutch and the direct clutch hub and direct clutch are positioned between the forward piston housing and the direct piston housing. At least a portion of the forward clutch and at least a portion of the direct clutch are operably mounted to the drum. The forward piston housing and direct piston housing do not counter rotate relative to one another. A power flow module for an OE vehicle automatic transmission is disclosed.

A forward/reverse switching mechanism is provided with a planetary gear set, a reverse brake and a forward clutch. The planetary gear set includes a sun gear which serves as an input part, a carrier which serves as an output part, and a ring gear. The reverse brake is adapted to fix the ring gear. The forward clutch is adapted to connect the ring gear and the sun gear to each other. The ring gear, a drive plate provided on a ring gear side of the reverse brake and a driven plate provided on a ring gear side of the forward clutch are spline-fitted to a clutch drum.

Disclosed is a support structure for a ring gear, which includes: a clutch drum coupled by spline fitting with the ring gear; and first and second snap rings mounted to a circumferential wall of the clutch drum and supporting the ring gear. The first snap ring is positioned so as not to overlap with the ring gear in a radial direction. The second snap ring is positioned so as to overlap with the ring gear in the radial direction. A length of the first snap ring in the radial direction is longer than a length of the second snap ring in the radial direction.

A kit for modifying a transmission input housing includes an overrun piston sleeve positioned on an outer surface of an input housing inner stepped portion, an overrun piston configured to mate with the overrun piston sleeve, and a replacement forward piston housing. An inner diameter of the overrun piston is larger than an inner diameter of an OE overrun piston. A forward piston sleeve is positioned on the outer surface of the input housing inner stepped conical portion adjacent the overrun sleeve. A forward piston mates with the forward piston sleeve. The forward piston has an inner diameter that is larger than an inner diameter of an OE forward piston. Seals are positioned between the forward piston and the forward piston sleeve and between the overrun piston and the forward piston at an outer diameter of the overrun piston.

A torque transfer device has a ring gear and inner and outer planet gear sets, which may not be orbiting but rotating in fixed positions relative to a housing. One of the gear sets may comprise compound gears. There may also be a sun gear connected to a planet gear set. The sun gear may be an input and the ring gear an output for a reducing gear system to act as a torque amplifier. The gears may be tapered and there may also be an axial force applied to one of the gear sets to tighten the meshing between the tapered gears. One of the gear sets, for example a gear set to which an axial force is applied, may be floating.

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.