Abstract: A transmission control system for controlling a transmission. The system has a main transmission with a speed changing mechanism and an output shaft, a substransmission connected to the output shaft, and a control system for receiving outputs from a number of sensors which sense the running state of the vehicle. The control system itself has two outputs, there being two separate hydraulic controls connected to the two system outputs, respectively. The two hydraulic controls control the speed changing mechanisms of the main and subtransmissions, respectively. Also provided is a hydraulic pressure source which supplies a working fluid to the two hydraulic controls. The control system determines whether the main and subtransmissions are in a transient period of the speed changing operation and, as long as one of the two transmissions is in the transient period, inhibits the speed changing operation of the other transmission.

Abstract: A four-wheel drive vehicle has an engine output shaft; a transmission having an input shaft connected to the output shaft and an output shaft connected through a transmission mechanism to the input shaft; a drive gear meshed with an output gear connected to the output shaft of the transmission; a front wheel side power transmitting mechanism; a rear wheel side power transmitting mechanism; a center differential mechanism coaxial with the drive gear and having an input member connected to the drive gear, a first output member connected to the front wheel side power transmitting mechanism, and a second output member connected to the rear wheel side power transmitting mechanism; a front differential gear coaxial with the center differential mechanism and connected to the first output member of the center differential mechanism; a power converting gear mechanism for converting a rotation about a first axis to a rotation about a second axis being perpendicular to the first axis to transmit power to the rear side p

Abstract: A device for supplying lubricating oil in a transmission mechanism, the transmission mechanism comprising: an input shaft; an output shaft disposed parallel to the input shaft; a first rotary body provided on the input shaft; a second rotary body provided on the output shaft; a transmission member for interlocking the first rotary body with the second rotary body; and, a transmission mechanism case forming a transmission mechanism chamber separated from the exterior for housing the transmission mechanism; and, the lubricating oil supply device comprising: a partition wall assembly with an opening disposed in the transmission mechanism case chamber and defining an oil chamber to contain the lubricating oil scattered by the rotation of the transmission mechanism through the opening; and, a lubricating oil supply passage connected to the oil chamber to supply the transmission mechanism with lubricating oil, the passage being disposed at a level lower than the opening, whereby oil scattered by operation of the tr

Abstract: A four-wheel drive vehicle has a front wheel side having a front wheel set, a rear wheel side having a rear wheel set, an engine having an output shaft extending in a transverse direction of a vehicular body, a transmission having an input shaft connected to the output shaft of the engine and an output shaft connected through a transmission mechanism to the input shaft such as to extend in a transverse direction of the vehicular body, a rotating member connected to the output shaft of the transmission, a front differential gear, a first output member connected between the rotating member and one of the wheel sets for transmitting power to one of the wheel sets through the front differential gear, a second output member coaxial with the first output member, a rear wheel propeller mechanism between the second output member and the other wheel set, and operative to convert the rotation of the second output member into rotation about an axis perpendicular to the axis of rotation of the second output member for dr

Abstract: Described herein is a hydraulic servo for a friction coupling element of an automatic transmission, which is mounted in association with a one-way clutch and which has reduced dimensions in radial and axial directions. The hydraulic servo essentially comprises: an annular drum splined with a sleeve portion of the inner race of the one-way clutch and arranged to receive the reaction of the one-way clutch by a fixed member in the automatic transmission case; a piston fitted in the annular drum; and a return spring mounted in the drum for returning the piston.

Abstract: Described herein is a hydraulic control system for vehicular automatic transmission, including an accumulator back pressure control circuit which is provided between a line pressure conduit and a back pressure supply conduit, and comprises a first accumulator control valve for dropping the line pressure according to the throttle opening, and a second accumulator control valve receiving an input pressure commensurate with the throttle opening and dropping the output pressure of the first accumulator control valve according to the throttle opening to apply to the piston of the accumulator a back pressure varying in corresponding to the engine output shaft torque.

Abstract: A vehicular automatic transmission control system comprising: a hydraulic control circuit including a hydraulic pressure source, a pressure regulator valve for producing a line pressure by regulating the oil pressure supplied from the pressure source, a number of shift valves for selectively engaging and releasing friction members of the automatic transmission according to operating conditions of a vehicle such as vehicle speed and throttle opening rate, and a solenoid valve blocking switching operation of a highest shift gear toward a highest gear position of the transmission; and an electronic control circuit for controlling on- and off-ranges of the solenoid valve, including a manual mode switch for setting the control either in a highest speed non-cancel mode permitting shifts to the highest gear position or a highest speed cancel mode inhibiting shifts to the highest gear position and forcibly effecting a downshift when selected during operation in the highest gear position, and a vehicle speed sensor; c

Abstract: A vehicular automatic transmission control system comprising: a hydraulic control circuit including a hydraulic pressure source, a pressure regulator valve for producing a line pressure by regulating the oil pressure supplied from the pressure source, a number of shift valves for selectively engaging and releasing friction members of the automatic transmission according to operating conditions of a vehicle such as vehicle speed and throttle opening rate, and a solenoid valve blocking switching operation of a highest shift gear toward a highest gear position of the transmission; and an electronic control circuit for controlling on- and off-ranges of the solenoid valve, including a manual mode switch for setting the control either in a highest speed non-cancel mode permitting shifts to the highest gear position or a highest speed cancel mode inhibiting shifts to the highest gear position and forcibly effecting a downshift when selected during operation in the highest gear position, vehicle speed sensor, and a k

Abstract: A supporting mechanism for a transmission shaft in an automatic transmission apparatus for use in a vehicle, wherein said shaft is rotatably supported at both end portions (1A), (1C) and at the intermediate portion (1B), and the amount of play of said shaft at said intermediate portion is set greater than those at the end portions, with a view to preventing oscillation of the shaft at the intermediate portion between the supporting points and favorably overcoming difficulty in assembly work, e.g., centering associated with supporting at three points.

Abstract: A transmission for a vehicle has a shift mechanism, a hydraulic actuator for operating the shift mechanism and a hydraulic control for supplying and discharging working oil to and from the hydraulic actuator to control the shift of the shift mechanism. The hydraulic control includes a flow regulating valve for regulating flow of the working oil supplied to the hydraulic actuator, as a function of pressure of the working oil supplied to the hydraulic actuator.

Abstract: A four-wheel drive vehicle has an engine output shaft; a transmission having an input shaft connected to the output shaft and an output shaft connected through a transmission mechanism to the input shaft; a drive gear meshed with an output gear connected to the output shaft of the transmission; a front wheel side power transmitting mechanism; a rear wheel side power transmitting mechanism; a center differential mechanism coaxial with the drive gear and having an input member connected to the drive gear, a first output member connected to the front wheel side power transmitting mechanism, and a second output member connected to the rear wheel side power transmitting mechanism; a front differential gear coaxial with the center differential mechanism and connected to the first output member of the center differential mechanism; a power converting gear mechanism for converting a rotation about a first axis to a rotation about a second axis being perpendicular to the first axis to transmit power to the rear side p

Abstract: A four-wheel drive vehicle has a front wheel side having a front wheel set, a rear wheel side having a rear wheel set, an engine having an output shaft extending in a transverse direction of a vehicular body, a transmission having an input shaft connected to the output shaft of the engine and an output shaft connected through a transmission mechanism to the input shaft such as to extend in a transverse direction of the vehicular body, a rotating member connected to the output shaft of the transmission, a front differential gear, a first output member connected between the rotating member and one of the wheel sets for transmitting power to one of the wheel sets through the front differential gear, a second output member coaxial with the first output member, a rear wheel propeller mechanism between the second output member and the other wheel set, and operative to convert the rotation of the second output member into rotation about an axis perpendicular to the axis of rotation of the second output member for dr

Abstract: A fluid pressure actuator for a frictionally engaged unit of a vehicular transmission includes a first transmission and a second transmission coupled to the output side of the first transmission and provided with a speed step change mechanism which has a frictionally engaging element for engaging a rotary member to a fixed member in such a manner as to enable an optional disengagement between the rotary member and the fixed member.

Abstract: In an automatic transmission, friction elements are engaged and disengaged by a hydraulic servo connected alternately to a pressure source or to a drain through a selector valve, and an accumulator is connected to the line between the selector valve and the servo. The resistance against the oil discharged from the accumulator, the resistance against the oil discharged from the servo, and the return biasing forces in the accumulator and servo are adjusted so that the hydraulic pressure at the servo is lower than the hydraulic pressure of the accumulator for a predetermined time when the selector valve connects the servo with the drain. In one embodiment, a relief valve responsive to a vehicle running condition, controls the discharge rate of working oil through the drain. In another embodiment, a pressure regulator varies the level of the pressure of the working oil discharged from the accumulator in response to variations in a vehicle running condition.

Abstract: A main transmission has a transfer gear attached to its output shaft. The transfer gear provides two wheel high speed drive, four wheel high speed drive, and four wheel low speed drive. A control system controls the main transmission according to a detected speed mode of the transfer gear. The control system uses an electrical detector for sensing the speed mode of the transfer gear.

Abstract: A four wheel drive automatic transmission, comprising: a speed-changing transmission unit; a front wheel transmission mechanism driven by the transmission unit and having a large driving gear and bearings for the large driving gear; a center differential unit having an input member driven by the large driving gear and two output members for driving front wheels and for driving rear wheels, respectively; a transfer with a rear wheel driving transmission having a driving gear member disposed coaxially with the output member for rear wheel driving, a connecting member between the output member for rear wheel driving and the driving gear member and a transfer output gear member driven by the driving gear member; a case in which the front wheel transmission mechanism, the center differential unit and the transfer are disposed; and, an oil separating structure defining separately lubricatable cavities within the case, the structure comprising two seal members, disposed between the connecting member and the case at

Abstract: In a clutch mechanism for a power transmission system which effects engagement and disengagement between a central shaft and an outer peripheral shaft provided on the outer periphery of the central shaft, an improvement characterized by comprising splines provided on the outer periphery of the central shaft, and an inner tube of an annular clutch cylinder containing a piston of a fluid actuator and a clutch plate of a multiple disk clutch, the inner tube being fitted on the outer periphery of the central shaft through the splines.

Abstract: Described herein is a brake support mechanism particularly suitable for use in a 4-wheel drive auxiliary transmission to reduce the axial dimensions and to facilitate assembling of the transmission, the brake support mechanism essentially comprising: a transmission case; a cylindrical rotary member mounted in the transmission case; a multiple disk brake constituted by a combination of brake plates splined on the inner periphery of the transmission case and brake disks splined on the outer periphery of the rotary member; a center support fitted in the transmission case in a position adjacent the multiple disk brake; and a hydraulic actuator including an annular cylinder formed in the center support on the side of the multiple disk brake, a piston slidably fitted in the cylinder, an operating fluid supply passage formed in the center support, a return spring located on the outer periphery of the multiple disk brake and having one end thereof abutted against the transmission case, and a return spring mounting me

Abstract: A power delivery system including an input shaft for transmitting driving power of an engine, an output shaft mounted concentrically with the input shaft, a pump mounted concentrically between the input and output shafts and connected to the input shaft, a fluid coupling having a turbine connected to the output shaft, a case containing the fluid coupling, and a power cut-off device, characterized in that the power cut-off device is provided with a frictional coupling element and a servo mechanism thereof and mounted in the aforementioned case.

Abstract: An automatic transmission for motorcar of the type including a main transmission and an auxiliary transmission is disclosed. The auxiliary transmission has a plurality of speed changing stages and when it assumes a certain lower speed stage, any speed changing to higher speed stage is inhibited in the main transmission. The main transmission is provided with a solenoid valve which makes it possible to carry out speed changing to higher speed stage when it is turned on, while the auxiliary transmission is provided with a hydraulic control device which is communicated with a hydraulic servo via a hydraulic passage. The hydraulic servo is operatively associated with a speed reduction frictional engagement element which allows the auxiliary transmission to assume a certain lower speed stage.