Aisin Seiki Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Marujun Seiki Ind. Co., Ltd.

Toyota Jidosha Kabushiki Ksiahs

Shigeo Takahashi

Hiroaki Maeda

Masanori Sato

Satomi Suzuki

Kiyofumi Mizuno

Kiyohumi Mizuno

Hiromi Hasegawa

Tsukasa Watanabe

Yoshitaka Soga

Tatsuo Ohhashi

Hirotaka Ito

Yutaka Taga

Kunio Morisawa

Noboru Murakami

Toshiaki Ishiguro

Masato Shimei

Shigeki Goto

Choji Furusawa

Noriyoshi Kondoh

Koichiro Hirozawa

Tatsuya Nishino

A hydraulic control apparatus for an automatic transmission which supplies a controlled hydraulic pressure to a engagement element includes a control valve unit including a line pressure input port, an output port for outputting the controlled hydraulic pressure, a spool for selectively opening and closing the line pressure input port and the output port, a spring for biasing the spool in one direction, a feedback hydraulic chamber, a pilot pressure chamber, a pilot pressure control device, a sleeve, a plunger positioned inside of the sleeve, and at least one plunger hydraulic chamber for pushing the plunger when the controlled hydraulic pressure is introduced therein so as to push the spool in a direction against the biasing direction of the spring. The hydraulic control apparatus further includes a switching device provided at a hydraulic passage between the output port and the plunger hydraulic chamber and for selectively establishing a communication therebetween.

Hydraulic control apparatus for automatic transmission

A torque converter with a lockup clutch includes a fluid passage into which flows operation oil supplied from a converter chamber, which is surrounded by the pump impeller and the turbine runner, to a lockup chamber in which engagement and disengagement of the lockup clutch are performed, the fluid passage being connected to an oil drain passage for the operation oil without passing through an engaging portion of the lockup clutch, and a valve formed at a point on the fluid passage and capable of controlling a flow amount of operation oil.

Torque converter with lockup clutch

A pressure-receiving plate for a friction device includes an annular portion and pawls formed integrally on the inner or outer periphery of the annular portion. The annular portion has one side provided with a friction surface which contacts a friction disk engaged with one of a driving member and a driven member, and another side provided with reduced-thickness portions formed by applying crushing work that takes hardness and surface roughness of the friction surface into consideration. The pawls are engaged with the other of the driving member and driven member.

Method for manufacturing a force-receiving plate for friction device

Force-receiving plate for friction device

A disk assembly is comprised of a circular plate having an outer flange portion extending in the radial direction and a plurality of tongues each of which is pressed out in the axial direction and an annular member whose inner radius is equals to that of each tongue, wherein each distal end of each tongue is snugly fitted in the annular member and the outer flange portion is fixed to one side of the annular member.

Disk assembly

A retarding control apparatus for an automotive vehicle includes first retarding signal output circuit for calculating a speed of a decrease in engine output based upon an engine output detecting signal, and outputting a corresponding retarding signal to a retarder; and first cutting circuit for cutting a connection between first retarding signal output circuit and retarder when a rate of decrease in distance to an object ahead of the vehicle calculated based upon a distance detection signal is less than a predetermined value and the distance to the object is greater than a predetermined value.

Retarding apparatus for automotive vehicles

In a hydraulic pressure control apparatus for an automatic transmission, a retarding control apparatus has a first retarding signal output for processing the engine output decreasing rate and outputting a corresponding retarding signal, the absorbed power of the engine upon retarder operation is sensed, and the pressure oil is regulated to a predetermined pressure wherein the predetermined pressure is modulated responsive to the absorbed power of the engine. A second retarding signal outputting outputs a retarding signal corresponding to braking operation and a switch changes over the connection to the retarder, upon detecting a braking operation, from the first retarding signal to the second retarding signal and vice versa. The shifting shock during operation of retarder is eliminated even under elevated hydraulic pressure during the retarder operation.

Hydraulic pressure control apparatus for automatic transmission

An automatic transmission control system includes a shift valve having a valve body, a spool, a sleeve, a plunger and a return spring. An area of the plunger is acted on by a throttle pressure and is smaller than an area of a land acted on by the throttle pressure. Accordingly, the spool is movable against the throttle pressure to make a upshift when the governor pressure is over a predetermined value in relation to the throttle pressure.

Automatic transmission hydraulic control system

A control apparatus for an automatic transmission connected to a hydraulic control circuit having a first changeover valve for switching a main transmission mechanism having at least two speed ratios between high and low speed ratios in dependence upon at least vehicle velocity, and a second changeover valve for switching an auxiliary transmission mechanism, which is provided in addition to the main transmission mechanism and has at least two speed ratios, between high and low speed ratios at a vehicle velocity higher than a changeover velocity of the first changeover valve. The control apparatus has a third changeover valve for switching the auxiliary transmission mechanism from low to high at a vehicle velocity lower than the changeover velocity of the first changeover valve, and from high to low when the vehicle velocity rises above the changeover velocity of the first changeover valve. The third changeover valve is capable of forming an intermediate speed, such as a 1.5 or 2.5. speed, by changing over the auxiliary transmission mechanism from low to high while the main transmission mechanism is low.

Intermediate shift control apparatus for automatic transmission

In the conventional cam device for a pressure regulating valve, when the cam is rotated abruptly, a contact force between the roller and the cam surface decreases abruptly particularly during the cam return stroke. On the other hand, a rotational force also tends to be applied to the plunger during the plunger return stroke. Therefore, there exists a problem in that the roller rotates together with the plunger out of a correct engagement between the roller and the cam surface. To overcome this problem, the roller and the cam surface are engaged in convex and concave engagement relationship. A convex is formed in the roller and a concave is formed in the cam surface or vice versa.

Cam device for pressure regulating valve

A rotary cam assembly includes a support shaft provided on a fixed bracket, a cam follower supported on the bracket so as to be slidably displaceable, a plate cam the outer circumferential portion of which has a cam surface contacted by the cam follower, the plate cam being freely rotatably mounted on the support shaft at a center hole, a cylindrical member extending along the central axis of the support shaft and having one end connected to the plate cam via coupling means formed in the center hole of the plate cam, and an input member connected to the other end of the cylindrical member for rotating the plate cam.

Rotary cam assembly

A control method of an automatic transmission for an automobile with exhaust brake provided, which includes a control signal given from an exhaust brake control arrangement, if a sensor indicates that the degree of throttle opening is zero and if a judging arrangement indicates that the downshift point is not yet passed over, downshift is performed by an automatic speed change, whereby the engine brake in addition to the exhaust brake is made effective to thereby secure a large braking force.

Control method of automatic transmission for automobiles with exhaust

A pressure modulator valve device having adjacent modulator valves, each including a sleeve, a plunger slidably fitted in the sleeve and a cam, the cams being connected to each other by a connecting member, a single supporting member for operatively supporting each of the cams and which is in contact with each sleeve so as to cover a front surface of each modulator valve, and a spring for biasing each sleeve in the direction of the single supporting member.

Pressure modulator valve device

A throttle valve assembly for displacing the plungers of at least two contiguous throttle valves in correspondence with the degree of throttle opening of an engine includes a first cam rotatably mounted on a stationary bracket fixed to the throttle valve bodies and having a cam face for displacing the plunger of the first throttle valve and an axially extending boss, a second cam rotatably mounted on the bracket and having a cam face for displacing the plunger of the second throttle valve and an axially extending boss, the first and second cams being coupled via coupling means formed on the opposing bosses, and a cable operatively associated with the engine torque demand for rotating the cams. The cam faces of the cams are formed to have a shape capable of providing the desired throttle pressure characteristic, the shapes of the cam faces differing from each other in order to obtain the optimum speed-change performance.

Growing community of inventors

Anjo, Japan

Shigeo Takahashi