Aisin-warner Kabushiki Kaisha

Toyota Jidosha Kabushiki Kaisha

Aisin Aw Co., Ltd.

Other

Keizo Kobayashi

Kazuhisa Ozaki

Mikio Iwase

Kouzi Kobayashi

Atsushi Tabata

Hiromichi Kimura

Hiroshi Kato

Kazunori Ishikawa

Yasuo Hojo

Kagenori Fukumura

Nobuaki Miki

Kazutoshi Nozaki

Kazuyuki Watanabe

Naoyuki Fukaya

Hideki Miyata

Koichi Tanaka

Nobutada Sugiura

Yoshinobu Nozaki

Yoshihiro Iijima

Youichi Hayakawa

Hideaki Ogasawara

Koji Kobayashi

Hiroyuki Tsukamoto

Masahiro Itou

Shoichi Sayo

Yuuji Kashihara

Shigeki Hiramatsu

Toshihiro Tomino

Futomi Hanji

Tatsuo Tozuka

Second and third clutches are axially aligned so that the back side of the second clutch and the front side of the third clutch oppose each other, and a first clutch is positioned radially inward of the second and third clutches. Further, a clutch drum is extended so as to be used in common by the second and third clutches, the second clutch is engaged and disengaged from the axial front side by a second piston of a second oil pressure actuator, and the third clutch is engaged and disengaged from the axial rear side by a third piston of a third oil pressure actuator. The first through third clutches are positioned in a compact manner and can be independently operated.

Automatic transmission

To prevent the neutral state from being formed in a change gear apparatus and allow the obtaining of an intended gear change appropriately during a servo malfunction. Hydraulic servos engage and disengage a plurality of friction engagement elements; a hydraulic pressure supply system supplies the hydraulic servo of a predetermined friction engagement element with hydraulic pressure; and an auxiliary hydraulic pressure supply systems supplies a predetermined hydraulic servo with another hydraulic pressure, in the case where the hydraulic pressure supply system is placed in a first unsupplied state where the hydraulic pressure supply system cannot supply the hydraulic servo of the predetermined friction engagement element with hydraulic pressure. The auxiliary hydraulic pressure supply system does not supply the predetermined hydraulic servo with the other hydraulic pressure, in the case that the hydraulic pressure supply system is placed in a second unsupplied state where the hydraulic pressure supply system does not supply the hydraulic servo of the predetermined friction engagement element with hydraulic pressure.

Hydraulic control apparatus for automatic transmission

A gear having high pitching resistance, sufficient surface hardness, sufficient hardened depth, high abrasion resistance, high breakage resistance, high fatigue resistance, and low gear noises. A material equivalent to JIS-SCM420 is soft nitrided for two hours in a mixture gas containing 45 to 65 volume % of residual NH.sub.3 at a gas temperature of 530 to 565.degree. C., thus producing a compound layer having a hardness equal to or higher than that of the material plus Hv 50 and a thickness of 200 .mu.m or more.

Soft nitrided gear and method of fabricating the same

A clutch piston slidably mounted for motion in the axial direction on the turbine shaft or the turbine runner of a torque converter comprising a pump, an impeller, a turbine runner and a stator. A direct coupling clutch is positioned between the clutch piston and the housing of a torque converter. Pressurized oil is supplied for releasing the clutch within an oil chamber between one side of the clutch piston and the housing. A converter pressure is continuously applied to the oil chamber and to the other side of the clutch piston, which is the operating chamber of the torque converter. Thereby, the direct coupling clutch is continuously released. When the automatic transmission is in a selected high speed position, a line pressure higher than the converter pressure, is applied to the operating chamber causing the direct coupling clutch to engage. Converter pressure is applied continuously to the operating chamber of the torque converter through one port of a check valve. The other check valve port is connected to the line pressure only when the automatic transmission is shifted to said high speed position, causing the direct coupling clutch to automatically engage.

Direct coupling clutch control system for automatic transmission

The automatic transmission comprises a torque converter having a pump, a turbine, a stator and a direct-coupling clutch adapted to engage the pump with the transmission casing, and a transmission gear having multiple forward gears and a reverse gear. A lockup control valve comprising a spool on which a governor pressure and the force of a spring act oppositely, and a switch valve adapted to change-over the oil-hydraulic circuits for the release or the engagement of the direct-coupling clutch, are provided for the oil-hydraulic control circuit of the automatic transmission. The direct-coupling clutch can become engaged only if the governor pressure should exceed a predetermined pressure and the transmission be in a select high speed range.

Direct-coupling clutch control system for an automatic transmission

A hydraulic circuit system in the automatic transmission has a hydraulic line or passage through which a hydraulic fluid delivered from a hydraulic power source or a hydraulic fluid output provided by a regulator valve is directly supplied to a torque converter, so that the overheat that may otherwise occur in the hydraulic fluid within the torque converter during the low engine output can effectively be prevented.

Hydraulic circuit system for automatic transmission

A control apparatus for a torque converter direct coupling clutch in an automatic transmission of a type which permits the shift pattern selectively to be switched over between the three forward speed shift ranges and four forward speed shift ranges according to the desire of a car driver, wherein the improved control apparatus controls the torque converter direct coupling clutch so as to be engaged at the highest speed gear ratio (shift range) in each shift pattern gear ranges.

Control apparatus for torque converter direct coupling clutch in

Growing community of inventors

Anjo, Japan

Keizo Kobayashi