Toyota Jidosha Kogyo Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Aisin-warner Limited

Aisin-warner Kabushiki Kaisha

Toyota Motor Corporation

Aisin Aw Co., Ltd.

Koujiro Kuramochi

Seitoku Kubo

Tatsuo Kyushima

Akio Numazawa

Tokuyuki Takahashi

Fumitomo Yokoyama

Yukio Terakura

Kazuaki Watanabe

Yoshinari Kuwayama

Tatsuya Iwatsuki

Kazumasa Tsukamoto

Masahiro Hayabuchi

Mitsuru Takada

Mutsumi Kawamoto

Takeshi Inuzuka

Shinya Nakamura

Masakatsu Miura

Makoto Funahashi

Takenori Kano

Hajime Arai

Yasunari Nakamura

Nobuyuki Kato

Masaharu Tanaka

Kiyoshi Ohnuma

Yoshihiro Yamada

Ryoichi Shirai

Mitsugu Tatsuta

Shin Miyajima

Seitok Kubo

Syoichi Sayou

Yasuo Houjo

In a vehicle in which opening of an intake throttle valve is controlled in accordance with stepping-on amount of an accelerator pedal by way of an electronic throttle opening control device, a hydraulic pressure control device is provided so as to detect a discrepancy between the stepping-on amount of the accelerator pedal and the opening of the intake throttle valve and to automatically cancel supply of hydraulic pressure to a selected one of friction engaging devices of an automatic transmission of the vehicle when the discrepancy exceeds a certain allowable limit value.

Hydraulic control device in automatic transmission in vehicle equipped

A differential motion limiting device, for a power transmission device for four wheel drive vehicle, to regulate differential motion of a center differential device includes a wet-type multi plate clutch and an hydraulic actuator. And a switching valve is attached to an oil passage to the hydraulic actuator. In normal running condition, a switching valve is in connecting condition, and a hydraulic pressure being varied by driving conditions is applied to a hydraulic actuator. Under this condition, the clutch is slippingly engaged by certain engaging force so that torque, per certain ratio, is transmitted to the front and the rear wheels. In high speed condition, such as the maximum speed state like an overdrive, or a vehicle speed more than 100 km/h, sensors detect such state, then the switching valve is switched, and the clutch is released. As a result, lubrication oil is flowed between friction plates and separators of the clutch to release heat therefrom.

Power transmission device for four wheel drive vehicles

In a hydraulic torque converter having a torus of flatness ratio (L/H) within the range 0.82-0.9, the outer and inner contours of the turbine in a meridional plane through the axis of the turbine each comprises a combination of a plurality of circular arcs, wherein the ratios between the radii of the circular arcs constituting said outer contour is substantially less than 2, and the ratios between the radii of the circular arcs constituting said inner contour is substantially less than 2. As a result, fluid flows through the turbine stably without being biased, increasing the velocity of relative flow along the turbine blade, and raising the normal speed ratio at which the absolute flow is in the direction of no impact, enabling a higher stall torque ratio without reduction in efficiency.

Hydraulic torque converter

The hydraulic pressure for operating the two wheel drive/four wheel drive switchover clutch in the part-time type four wheel drive device or the central differential lock-up clutch in the full-time type four wheel drive device is produced by a combination of a pressure regulation valve and two switchover valves to be selectable among several substantially different pressure levels so that the four wheel drive device can be quickly switched over between the complete four wheel operation and the complete two wheel operation, including one or more intermediate half clutched incomplete four wheel operation.

Hydraulic pressure control device for clutch for controlling drive

A strainer is mounted in an oil passage within a valve body constituting the hydraulic control unit of an automatic transmission. The strainer includes a frame (4) fitted into the oil passage, a reticulate member (5) secured to the frame (4) so as to form a barrier across the oil passage, and a permanent magnet (8) secured by press-fitting or by bonding to frame at a position ahead of the reticulate member (5) in terms of the direction of working oil flow. Foreign matter contained in the working oil is removed by the reticulate member (5) while extremely small contaminants exhibiting a magnetic property, such as ferrous chips, that cannot be removed by the reticulate member (5) are removed by the magnet (8).

Magnetic oil strainer

An automatic transmission includes a fluid torque converter and a first and second gear transmission mechanisn, each of which has two coaxial drive members--a power input member and a power output member--and is selectable to any one of several speed radios. Rotational power is output from the fluid torque converter to the power input member of the first gear transmission mechanism. The torque converter, and the first gear transmission mechanism including the power input and output members thereof are all coaxial on a first axis. The power input and output members of the second gear transmission mechanism rotate around a second axis parallel to the first axis, and a first lay shaft element is coupled to this power input member and extends along this second axis out from one side of the second gear transmission mechanism and is rotationally coupled to the power output member of the first gear transmission mechanism by a rotational power transfer mechanism, while a second lay shaft element is coupled to the power output member of the second gear transmission mechanism and extends along this second axis out from the other side of the second gear transmission mechanism and is fixedly coupled to a power output gear wheel.

Transverse type automatic transmission with two separate lay shaft

In an automatic transmission control system incorporating the conventional line, throttle, and governor fluid pressure regulation valves, mannual selector valve, and shift valves such as 1/2, 2/3, and 3/4 shift valves, there is further incorporated a modulator fluid pressure control valve which produces a modulator fluid pressure of a predetermined constant level from the line pressure available from a port of the manual selector valve when it is shifted to a lower range, such as, for example, 2 range. The line fluid pressure regulation valve, which is normally boosted by the throttle pressure, is instead boosted by the modulator fluid pressure when the modulator fluid pressure is present while the throttle fluid pressure is very low as at the time when the manual selector valve has been shifted from the D range to the 2 range for effecting rapid deceleration of the vehicle, so as to support the governor pressure, generated from the line pressure, at a high level while the vehicle speed is still high. A shift valve, which, for example, is the 2/3 shift valve, which is normally shifted by a balanced between the throttle pressure and the governor pressure, is instead shifted by a balance between the modulator fluid pressure and the governor pressure when the modulator pressure is present and the throttle pressure is very low, so that downshifting to 2nd. gear is prevented until the vehicle speed is reduced to a predetermined value. The modulator fluid pressure is supplied to a friction engaging mechanism which provides engine braking in 2nd. gear.

Transmission control system with protection against excessively high

A torque converter includes a coaxially mounted pump impeller, turbine, and stator, each of which includes an outer shell, an inner shell, and vanes extending between the outer shell and the inner shell having edges which define an inlet and outlet. The pump impeller outlet is proximate to the turbine inlet, the turbine outlet is proximate to the stator inlet, and the stator outlet is proximate to the pump impeller inlet. The outer and inner shells cooperate to define outer and inner toroidal surfaces, which together define a hollow toroidal hydraulic fluid circulation path. The ratio between the axial extent and the radical extent of a section of the outer toroidal surface is less than approximately 0.9. The axial distance between the general axial position of the edges of the stator vanes which define the stator inlet and the axial position of the edge of the stator inner shell in the direction of the stator inlet is substantially greater than zero, and the stator vanes which define the stator inlet extend more towards the direction of the turbine outlet than does the edge of the stator inner shell in the direction of the stator inlet.

Fluid torque converter with axially cut away stator inner shell

A rotary power transmission device including a hydraulic torque converter which transmits rotary power between coaxial power input and power output shafts, and a lock up clutch system which also transmits rotary power between the power input and power output shafts, wherein the lock up clutch system includes a rotary shock absorber including a disk shaped plate element and two ring shaped plate elements cooperating with an outer peripheral portion of the disk shaped plate element in an axially superposed manner so as to provide a rotary shock absorber, one of the two ring shaped plate elements being positioned between the other ring shaped plate element and the disk shaped plate element, the assembly of the two ring shaped plate elements and the outer peripheral portion of the disk shaped plate element being positioned in an annular space formed adjacent an outer peripheral portion of the turbine of the hydraulic torque converter, while the radially inner portion of the disk shaped plate element is rotationally connected to the power output shaft in parallel with the turbine, wherein more than two circumferentially elongated slot shaped apertures are formed in the middle ring shaped plate element, through each of which a pin rotatably supporting an annular bearing element is passed and mounted at its opposite ends to the other ring shaped plate element and the disk shaped plate element with the annular bearing element being engaged with either a radially inner or a radially outer arcuate edge of the slot shaped aperture.

Torque converter lock up clutch rotary shock absorber with inner plate

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 opposite ends of the rear wheel driving mechanism, whereby the rear wheel driving mechanism is disposed in a cavity within the case which can be filled with a lubricant different from that used for lubricating the transmission unit, the front wheel driving mechanism and the center differential unit, without risk of the different lubricants mixing. The oil separating structure may be so arranged that the cavity for the rear wheel driving mechanism surrounds the other cavity, the connecting member being cylindrical and defining an annular wall separating the cavities between the sealing members.

Oil separating structure of automatic transmission

A control system for an intermediate differential in a four-wheel drive vehicle, the intermediate differential being provided with a lock mechanism which is operated under control of an actuator to selectively maintain the intermediate differential in a locked condition or an unlocked condition. The control system includes a first sensor arranged to detect a steering angle of a dirigible road wheel for producing a first detection signal therefrom when the steering angle exceeds a predetermined value, a second sensor arranged to detect disconnection of the drive power transmitted to the intermediate differential from a prime mover of the vehicle for producing a second detection signal therefrom when transmission of the drive power is disconnected, and a control device responsive to the first and second detection signals from the sensors for controlling the actuator in such a manner that the lock mechanism is operated to release the locked condition of the intermediate differential when the steering angle exceeds the predetermined value in a condition where the transmission of the drive power is disconnected.

Control system for intermediate differential in four-wheel drive vehicle

A governor valve for a hydraulic controller in an automatic transmission, which is disclosed herein, comprises an adapter having a line pressure supply bore made therethrough, a cylindrical governor rotary shaft loosely fitted into the adapter sleeve and having a line pressure supply port made therein, the port including notches intersecting the axis at right angles, a centrifugal weight mounted on one end of the governor rotary shaft and having a return spring, and a spool adapted to slide within the governor rotary shaft with the weight being urged against one end thereof. In this governor valve, there are provided dirt and dust collecting means for preventing dirt and dust separated by a centrifugal action from collecting in the line pressure supply port during the stoppage of the governor rotary shaft so as to make the shaft stick.

Governor valve

An improved transverse-mount type driving device for an automobile, having an output gear provided between last and intermediate planetary gear units of an auxiliary speed change gear assembly, the output gear meshing with a driven gear on a transmission shaft which extends parallel with the auxiliary speed change gear assembly and mounts a drive gear at an end proximate of the torque converter for meshing engagement with a differential drive gear which in turn transmits power to right and left axle shafts. A parking gear is provided on the transmission shaft for selective engagement to prevent rotation of the transmission shaft when the automobile is in park.

Automobile transmission with output shaft parallel to crank shaft and

A one-way clutch biasing means for an automatic transmission, comprising: an inner spline formed on a one-way clutch retaining member; an outer spline formed on the outer race of the one-way clutch and loosely meshed with the inner spline; and a resilient member fitted between a side wall surface of the inner spline of the retaining member and an opposing side wall surface of the outer spline of the outer race to urge the outer race constantly in the locking direction of the one-way clutch.

One-way clutch mounting means for automatic transmissions

An internal-gear pump with a partition plate, comprising: an arcuate chamfer formed at an inner edge of an end face of the partition plate rotationally opposing an inner gear of the pump and having a curvature at least greater than that of tooth tip edges of the inner gear.

Growing community of inventors

Okazaki, Japan

Koujiro Kuramochi