Abstract: A bearing arrangement for a shaft, particularly a driveshaft (1) in a transmission housing (5) of an automatic transmission with an actuating piston (6) of a shifting element arranged inside the shaft. At least one self-sealing bearing is provided at least on the side of the transmission housing (5) remote from the motor to support the shaft.

Abstract: A power transmission configured with a mechanical pump that generates and deliver a fluid pressure to a clutch. An electromagnetic pump generates and delivers a fluid pressure to the clutch, and an accumulator connects the clutch and the electromagnetic pump, and accumulates fluid pressure acting there between. A switching valve selectively switches between connecting the mechanical pump side and the clutch in a fluid communicating manner and connecting the electromagnetic pump and the clutch in a fluid communicating manner. A valve drive portion that drives the switching valve so as to connect the mechanical pump side and the clutch when the mechanical pump is driving, and drives the switching valve so as to connect the electromagnetic pump and the clutch when the electromagnetic pump is driving in place of the mechanical pump.

Abstract: An automatic transmission is provided. One embodiment of the automatic transmission may include a valve body including control valves for hydraulically controlling a friction engaging element provided within said transmission. The automatic transmission may further include an electric control unit located on said valve body for controlling gear shifting of said automatic transmission. The automatic transmission may further include a transmission case having a peripheral wall for at least partially enclosing a gear shift mechanism and an outer wall provided adjacent to said peripheral wall, wherein said electric control unit is located within a containing space surrounded by said peripheral wall, said outer wall and said valve body.

Abstract: An automatic transmission control unit determines whether or not a constantly open failure, in which a switch valve cannot switch a pressure regulating valve and a second hydraulic chamber to a non-communicative state, has occurred on the basis of a parameter (an inertia phase time, for example) representing a dynamic characteristic during a shift from a first gear position to a second gear position. The determination of the constantly open failure is begun after initial variation in the parameter representing the dynamic characteristic during the shift has been eliminated through learning control in which the dynamic characteristic during the shift is caused to approach a target dynamic characteristic.

Abstract: A control device for a vehicular drive apparatus, includes: a torque converter having a pump wheel, a turbine wheel and a stator wheel rotatably disposed between the turbine wheel and the pump wheel; an electric motor operative to drive and/or apply a brake to the stator wheel; a first connecting/disconnecting means operable to connect/disconnect the electric motor and the stator wheel to and from each other; a second connecting/disconnecting means operable to connect/disconnect the electric motor and an output shaft to and from each other; and mode switching means for switching a first mode in which the first connecting/disconnecting means is held in a connecting state to allow the electric motor to control a rotating state of the stator wheel and a second mode in which the second connecting/disconnecting means is held in a connecting state to enable the electric motor to perform power running and regeneration, depending on a running condition of a vehicle.

Abstract: A hydraulic pressure control system for an automatic transmission is capable of reducing the size and simplifying the structure of a lockup controlling hydraulic circuit. An oil pressure output from a solenoid valve acts on an oil pressure chamber. The internal pressure of another oil pressure chamber becomes high only in a forward low-speed range and becomes low in all of the other gear shift ranges. The internal pressure of another oil pressure chamber becomes high only in forward ranges and becomes low in neutral and reverse ranges. The valve member moves in accordance with oil pressures applied to the oil pressure chambers to change over oil paths connected to a clutch control oil chamber and a torque converter oil chamber, whereby a lockup clutch assumes one of engaged, slip, and released states.

Abstract: An automatic transmission having a turbine, a pump, a first stator and a second stator and a speed changer having a planetary gear train composed of first and second planetary gears sharing one planetary carrier in common and a clutch or brake for controlling the planetary gear train. The turbine of the torque converter is coupled to a turbine shaft which transmits power from the turbine to the speed changer. A first stator is provided at a turbine side between the turbine and the pump, the first stator being coupled to a first stator shaft for transmitting power from the first stator to the speed changer a one-way clutch. A second stator is provided at a pump side between the turbine and the pump. The second stator is connected to a housing though a second stator shaft having a one-way clutch for transmitting power in a direction reverse to the rotation direction of the pump. A clutch or brake for controlling rotation speed of the first stator shaft is provided in the course of the first stator shaft.

Abstract: A stator shaft is press-fitted and secured to the inner peripheral surface of a pump cover positioned between a torque converter and a automatic transmission mechanism section. Bushings are fitted to a part opposing the press-fit section with reference to the outer peripheral surface of an input shaft fabricated with a uniform diameter with the exception of the rear end part, and to a part slightly forward of the above-mentioned part, respectively, and an oil channel for the torque converter feed pressure is formed between the two bushings. As a result, the forward end section of the input shaft is supported in a freely rotatable manner by the bushings which are relatively close to each other. The torque converter feed pressure is fed from an oil channel formed in the pump cover to an oil channel between the two bushings, and through the cross hole and the center hole formed in the input shaft to the torque converter.

Abstract: A method of monitoring an output and adjusting the action affecting the output continuously for an electronic automatic transmission system wherein a controller is programmed to "learn" from the results of its operation. The method includes monitoring the speed of an input member and the instantaneous fluid volume of a friction element. The method also includes setting a learned volume value equal to an instantaneous fluid volume whenever the input speed is within a predetermined range of a predetermined speed. The method further includes comparing the learned volume value to a stored fill volume value at the end of the shift and adjusting the stored fill volume value based on the difference between the learned volume value and the stored fill volume value.