Aisin Aw Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Aisin-Warner Kabushiki Kaisha

Aisin-Warner Limited

Other

Nok Corporation

Toyota Motor Corporation

Aisin Aw Kabushiki Kaisha

Fumitomo Yokoyama

Takenori Kano

Yoshinari Kuwayama

Masakatsu Miura

Yasuo Hojo

Kazuhisa Ozaki

Yasunari Nakamura

Haruki Takemoto

Mamoru Niimi

Isao Takase

Atsushi Tabata

Kagenori Fukumura

Koujiro Kuramochi

Makoto Hijikata

Hideki Miyata

Nobuaki Takahashi

Takao Taniguchi

Masahiko Ando

Akira Fukatsu

Yasunori Nakawaki

Masaharu Tanaka

Akihito Hongoya

Mitsugu Tatsuta

Akihiro Kuroyanagi

Kazumasa Tsukamoto

Seitoku Kubo

Shiro Sakakibara

Nobuaki Miki

Mikio Iwase

Tatsuo Kyushima

Teruo Akashi

Tatsuya Iwatsuki

Kouji Ohbayashi

Isamu Minemoto

Masanori Kadotani

Naohisa Momiyama

Toshiyuki Mae

Michio Maruki

Ryoichi Shirai

Shoichi Sayo

Motoyuki Sakai

Yoshimi Watanabe

Koji Tsukamoto

Shinobu Maseki

Hideji Kato

Masayuki Tsurumi

Masataka Shimazaki

Masayoshi Imakire

Katsuyuki Asaoka

Shin Miyajima

Harumichi Tsuboi

Yoshiaki Hirota

Parking device for automatic transmission

An automatic transmission including at least one rotary member; a rotary member enclosure enclosing the rotary member; and an oil reservoir arranged below the rotary member enclosure for collecting and reserving the oil. An oil separator is located facing the outer circumference of the rotary member for separating the oil adhering to the rotary member. Because the amount of oil left on the surface of the rotary member is reduced, the amount of oil recovered in the oil reservoir is accordingly increased and the level of the oil surface in the oil reservoir is prevented from falling.

Automatic transmission with a separator for removing oil from the

An oil seal member is compressed between a connecting pipe for supplying oil to an oil chamber of a hydraulic servo and the cylinder drum of the hydraulic servo. The cylinder drum has an interior oil chamber and turns through a predetermined angle upon operation of a frictional engagement element by the hydraulic servo. The end of the seal member pressed against the cylindrical drum surrounds an oil hole 73 formed in the cylindrical drum, and oil pressure is supplied to the oil chamber through an oil passage in which the seal member is mounted and through the oil hole. A recess is formed in the outer surface of the cylindrical drum around the oil hole and the end of the seal member is received in the recess. When the cylindrical member turns within the predetermined angular range, the end of the seal member is protected by the recess. As a result, the end of the seal member is not damaged and the integrity of the seal is protected.

Oil seal for automatic transmission

A control system for an automatic transmission, in which a first frictional engagement element and a second frictional engagement element are released according to a shift from a running range to a non-running range. The shift from the running range to the non-running range is detected, and the reduction in the oil pressure of the second frictional engagement element is controlled on the basis of the reduction in the oil pressure of the first frictional engagement element when the shift from the running range to the non-running range is detected.

Control system for automatic transmission, including coordinated

An oil temperature responsive hydraulic control system for an automatic transmission includes a hydraulic servo for applying/releasing a frictional engagement element; a pressure regulator valve for regulating oil pressure fed to the hydraulic servo; and a signal pressure oil passage for applying a pressure regulating signal pressure to the pressure regulator valve. A control valve is arranged in the signal pressure oil passage for changing the effective diameter of the signal pressure oil passage responsive to change in oil temperature.

Oil temperature responsive hydraulic control system for an automatic

A lockup clutch for torque converter which prevents engaging and disengaging shock when a transmission torque suddenly changes, includes a lockup clutch assembly, a lockup clutch piston operating the lockup clutch assembly, and a damper device disposed between the lockup clutch piston and an output member for absorbing changes of transmission torque occurring in association with the operation of the lockup clutch assembly. The lockup clutch piston is made of steel and has a thermally treated portion placed at a surface in contact with springs of the damper device wherein the thermally treated portion is hardened by rapid local melting with high density energy radiation such as electron beam followed by rapid cooling.

Lockup clutch for a torque converter and method of thermally treating a

An automatic transmission for a transverse engine vehicle having a first shaft aligned with an engine crankshaft, a second shaft and third shafts driving front wheels of the vehicle. The first, second and third shafts are arranged in a triangular configuration in an end view. A fluid coupling, a main transmission and a counter drive gear are arranged on the first shaft. A counter driven gear, meshing with the counter drive gear, and a reduction gear are both arranged on the second shaft. A differential unit is interposed to drive the third shafts and has a ring gear meshing with the reduction gear. The counter drive gear is located on the first shaft between the fluid coupling and the main transmission, has a supporting boss portion extending toward the main transmission and is supported by the transmission case. The first shaft extends from the fluid coupling and through the counter drive gear for connection to at least one input element of the main transmission. The differential unit has a casing with left-hand and right-hand extensions which are supported by the transmission case through bearings. The plane of rotation of the ring gear and reduction gear meshed therewith is interposed between the planes in which the bearings support the left-hand and right-hand extensions.

Automatic transmission for transverse engine vehicle

Thrust force generated by a hydraulic actuator is absorbed in a attachment device for a four speed automatic transmission mechanism. When hydraulic pressure is applied to the hydraulic actuator to engage a third and a fourth clutches, pressing force from a piston works on a strut member situated between the third and fourth clutches as a compression force, while a force working on a drum member as a tension force, so that these forces are counterbalanced and absorbed in the attachment device. Consequently, one directional move of the attachment device is supported by a little force such as contacting a snap ring and a thrust washer to a clutch drum, on the other hand, another move of the attachment device is supported by a little force such as connecting the drum member and a big ring gear by a snap ring.

Floating structure for interconnecting three clutches with a single

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

A centrifugal hydraulic pressure cancel chamber is arranged at the back of a second piston member of a second hydraulic actuator for the second clutch. A first piston member of a first hydraulic actuator for a first clutch is situated behind the second piston. A centrifugal hydraulic pressure cancel plate is set at an inner periphery on a rotating member to prohibit axial movement and set at an outside periphery in a inside of the piston member oil-tightly. The inside surface of the second piston member and the cancel plate compose the centrifugal hydraulic pressure cancel chamber. A spring is placed between the second piston member and the cancel plate, and the centrifugal hydraulic cancel chamber and the spring work correspondingly to the first and the second piston members.

Hydraulic device for an automatic transmission

Reverse shift control device on automatic transmission

A hydraulic control device which has a check valve controlling hydraulic pressure to a hydraulic actuator. Hydraulic pressure is selectively supplied to one of plural oil passages having different capacity orifices by a switching valve which switches high speed rotation mode and low speed rotation mode. A hydraulic power source and plural oil passages having different capacity orifices are connected to the switching valve which is controlled by hydraulic pressure varying according to vehicle speed. When rotation of the input shaft is low, the switching valve is connected to the oil passage having small capacity orifice, then hydraulic pressure is supplied to the hydraulic actuator through the orifice of small capacity. At this stage, as centrifugal force working on the ball in the check valve is low, the check valve is closed by even small amount of oil supply through the small capacity orifice, and raises hydraulic pressure in the actuator, so the clutch is engaged smoothly. When rotation of the input shaft is high, the switching valve is connected to the oil passage having the large capacity orifice, then hydraulic pressure is supplied to the hydraulic actuator through the large capacity orifice. At this stage, even if centrifugal force works on the ball is large, the check valve is closed by large amount of oil supply through the large capacity orifice, and raises hydraulic pressure in the hydraulic actuator, so the clutch is engaged smoothly.

Hydraulic control device for an automatic transmission

A rotation detecting sensor is situated on the inside of a sleeve, so that the sensor detects a detected member, such as an input shaft and the like for an automatic transmission, from the inside of the sleeve. A hub projected toward inside a case is constituted, a sleeve enclosing the hub is fixed on the rotating shaft, the rotation detecting sensor is installed on the hub so that the sensor faces a detected member constituted on the inner surface of the sleeve. By this, the rotating shaft such as the input shaft and the like rotates with being supported by the hub of the case, and the sleeve fixed on the rotating shaft rotates together. The detected member is detected by the rotation detecting sensor placed at the hub.

Rotation detecting device of an automatic transmission

A power transmission device for four wheel drive vehicle includes a differential motion limiting device, for limiting differential motion of a center differential device, which is made up by a wet-type frictional clutch and a hydraulic actuator. Under running condition, the frictional clutch is engaged by certain engaging force, and considering frictional coefficient of roads, the clutch is engaged with some slips so that torque distribution to front and rear wheels becomes even (50:50), then torque is distributed from the center differential device to front and rear wheels. The line pressure is applied to the hydraulic actuator through a regulator valve. In normal running condition, the regulator valve reduces the line pressure pre certain ratio, the reduced pressure is applied to the hydraulic actuator. In the case the manual valve being shifted to R range or low speed position, the regulator valve is switched to apply the line pressure directly to the hydraulic actuator. In the case of the manual valve being shifted to a low speed position, then from the low speed port of the manual valve, the line pressure is applied to a modulator valve where the line pressure is modulated, and applied to a back pressure port of a primary regulator valve to boost the line pressure up to certain volume.

An intake adapter is provided on an oil intake opening formed in a transaxle casing. A tightly sealed space in communication with an oil pump is provided in the lower part of the transaxle housing, formed in such a manner that it can be opened by the removal of a cover member which is secured to the transaxle casing in a freely mountable and removable manner. An oil strainer is housed in the tightly sealed space and an intake adapter is provided in communication with the tightly space and an oil sump. As a result the oil in the oil sump is taken into the intake opening of the oil strainer from the adapter, and foreign matter such as iron particles and the like is removed in a filter element and the filtered oil is supplied to an oil pump.

Hydraulic apparatus for an automatic transmission

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Anjo, Japan

Fumitomo Yokoyama