Abstract: An oil pump for an automatic transmission includes a pump body having a pump chamber, a pump cover disposed so as to oppose to the pump body, an inner rotor disposed in the pump chamber and driven by a driving force from a torque converter and an outer rotor meshed with the inner rotor. The pump body includes a pump suction port, a pump discharge port a first oil, passage for supplying oil from a oil pan to the pump suction port, a second oil passage for returning excess oil of a first regulator to the first oil passage and a third oil passage having an outlet port for returning excess oil of a second regulator to the pump suction port.

Abstract: A planetary gear structure includes a carrier, a plurality of pinion shafts each inserted into a bore in the carrier, and a stopper plate arranged between a pair of the pinion shafts to hold the pinion shafts without any revolutions on its own axis.

Abstract: An automatic transmission apparatus comprising, a first member rotating integrally with an input shaft and including a first cylindrical portion having an inner spline at an inner peripheral surface, a second member including a second cylindrical portion having an outer spline for engaging with the inner spline of the first member and a depressed portion formed on the second member and a clearance, which establishes a communication between an inner portion surrounded by the first and the second members and an outer portion of the first and the second members, is formed between the depressed portion of the second member and the inner surface of the first member.

Abstract: An output shaft supporting structure includes an output shaft having a hollow space opened in one end side, an intermediate shaft whose one end having an insert portion inserted into the hollow space, an extension housing placed on the edge of a casing, a first bearing and a second bearing disposed between the outer peripheral surface of the output shaft and the inner peripheral surface of the extension housing, a third bearing disposed between the outer peripheral surface of the insert portion and the inner peripheral surface of the hollow space. A part of rotational elements of a planetary gear set is supported between the outer peripheral surface of the insert portion closer to one end of the intermediate shaft than the third bearing and the inner peripheral surface of the hollow space, and at least a portion of axial position of the third bearing is located between the first bearing and the second bearing.

Abstract: A lubricating system for an automatic transmission including at least one planetary gear set and plural friction engagement elements includes an oil pump which pumps oil to generate oil pressure in response to activation of a driving power source and an introducing passage which is provided at a planetary carrier of the at least one planetary gear set, receives the oil from the oil pump and directs the oil for purposes of lubrication.

Abstract: A planetary gear includes a sun gear, a ring gear, a plurality of pinion gears geared with the sun gear and the ring gear, a plurality of pinion pins provided at internal peripheral side and coaxial to the pinion gear to be rotatable relative to the pinion gear, a carrier having penetration bores inserted with axial end portions of the pinion pin for supporting the pinion pins so that the pinion gears rotate about the sun gear, a plate member provided on the carrier, a slit formed on an axial end portion of the pinion pin projected from one of the penetration bores, a fitting portion unitary formed on the plate member to be fitted into the slit, a recess portion of the carrier recessed in an axial direction, and a projecting portion unitary formed on the plate member to be engaged with the recess portion of the carrier.

Abstract: An automatic transmission apparatus comprising, a first member rotating integrally with an input shaft and including a first cylindrical portion having an inner spline at an inner peripheral surface, a second member including a second cylindrical portion having an outer spline for engaging with the inner spline of the first member and a depressed portion formed on the second member and a clearance, which establishes a communication between an inner portion surrounded by the first and the second members and an outer portion of the first and the second members, is formed between the depressed portion of the second member and the inner surface of the first member.

Abstract: A planetary gear mechanism which includes a sun gear having an introduction passage and a communication passage for communicating the introduction passage and an outside of the sun gear, a ring gear, a plurality of pinion gears geared with the sun gear and the ring gear, a plurality of pinion pins rotatable relative to the pinion gears, a carrier having a penetration bore inserted with the pinion pin for supporting the pinion pins so that the pinion gears rotate about the sun gear, a washer provided between the pinion gear and the carrier being inserted with the pinion pin, a slit formed on the carrier formed radially inward relative to the penetration bore, the slit being formed facing the washer, a restriction portion formed on the washer, and an extension portion formed on the washer and extended radially inward relative to a tooth flank of the pinion gear.

Abstract: An oil pump for an automatic transmission includes a pump body having a pump chamber, a pump cover disposed so as to oppose to the pump body, an inner rotor disposed in the pump chamber and driven by a driving force from a torque converter and an outer rotor meshed with the inner rotor. The pump body includes a pump suction port, a pump discharge port a first oil, passage for supplying oil from a oil pan to the pump suction port, a second oil passage for returning excess oil of a first regulator to the first oil passage and a third oil passage having an outlet port for retuning excess oil of a second regulator to the pump suction port.

Abstract: A planetary gear structure includes a carrier, a plurality of pinion shafts each inserted into a bore in the carrier, and a stopper plate arranged between a pair of the pinion shafts to hold the pinion shafts without any revolutions on its own axis.

Abstract: A lubricating system for an automatic transmission including at least one planetary gear set and plural friction engagement elements includes an oil pump which pumps oil to generate oil pressure in response to activation of a driving power source and an introducing passage which is provided at a planetary carrier of the at least one planetary gear set, receives the oil from the oil pump and directs the oil for purposes of lubrication.

Abstract: An output shaft supporting structure includes an output shaft having a hollow space opened in one end side, an intermediate shaft whose one end having an insert portion inserted into the hollow space, an extension housing placed on the edge of a casing, a first bearing and a second bearing disposed between the outer peripheral surface of the output shaft and the inner peripheral surface of the extension housing, a third bearing disposed between the outer peripheral surface of the insert portion and the inner peripheral surface of the hollow space. A part of rotational elements of a planetary gear set is supported between the outer peripheral surface of the insert portion closer to one end of the intermediate shaft than the third bearing and the inner peripheral surface of the hollow space, and at least a portion of axial position of the third bearing is located between the first bearing and the second bearing.

Abstract: A planetary gear mechanism which includes a sun gear having an introduction passage and a communication passage for communicating the introduction passage and an outside of the sun gear, a ring gear, a plurality of pinion gears geared with the sun gear and the ring gear, a plurality of pinion pins rotatable relative to the pinion gears, a carrier having a penetration bore inserted with the pinion pin for supporting the pinion pins so that the pinion gears rotate about the sun gear, a washer provided between the pinion gear and the carrier being inserted with the pinion pin, a slit formed on the carrier formed radially inward relative to the penetration bore, the slit being formed facing the washer, a restriction portion formed on the washer, and an extension portion formed on the washer and extended radially inward relative to a tooth flank of the pinion gear.

Abstract: A planetary gear includes a sun gear, a ring gear, a plurality of pinion gears geared with the sun gear and the ring gear, a plurality of pinion pins provided at internal peripheral side and coaxial to the pinion gear to be rotatable relative to the pinion gear, a carrier having penetration bores inserted with axial end portions of the pinion pin for supporting the pinion pins so that the pinion gears rotate about the sun gear, a plate member provided on the carrier, a slit formed on an axial end portion of the pinion pin projected from one of the penetration bores, a fitting portion unitary formed on the plate member to be fitted into the slit, a recess portion of the carrier recessed in an axial direction, and a projecting portion unitary formed on the plate member to be engaged with the recess portion of the carrier.

Abstract: A clutch device for an automatic transmission includes an input member, a first output member, a second output member, a first clutch mechanism formed between the input member and the first output member, a first piston movable in a first axial direction for engaging the first clutch mechanism to transmit rotation torque from the input member to the first output member by receiving oil pressure, and a second clutch mechanism formed between the input member and the second output member radially outwardly of the first clutch mechanism. The first clutch mechanism and the second clutch mechanism are located in axially overlapping relation to each. A second piston is movable toward the second axial direction that is inverse to the first axial direction for engaging the second clutch mechanism to transmit rotation torque from the input member to the second output member by receiving oil pressure.

Abstract: A clutch device for an automatic transmission includes an input member, a first output member, a second output member, a first clutch mechanism formed between the input member and the first output member, a first piston movable in a first axial direction for engaging the first clutch mechanism to transmit rotation torque from the input member to the first output member by receiving oil pressure, and a second clutch mechanism formed between the input member and the second output member radially outwardly of the first clutch mechanism. The first clutch mechanism and the second clutch mechanism are located in axially overlapping relation to each. A second piston is movable toward the second axial direction that is inverse to the first axial direction for engaging the second clutch mechanism to transmit rotation torque from the input member to the second output member by receiving oil pressure.

Abstract: A hydraulic accumulator for vehicle transmission includes a valve body incorporated into the transmission casing, a piston disposed in a space provided in the valve body and dividing the space into first and second pressure chambers and a cylindrical sleeve member for closing the space. The sleeve member includes a cylindrical portion formed integral with a cover portion for slidable engagement with the piston. The thickness of the cylindrical portion is variable and permits the changing of the effective area difference between the opposite sides of the piston so that desired pressure characteristics can be obtained.