Aisin Aw Co., Ltd.

Toyota Jidosha Kabushiki Kaisha

Aisin Takaoka Co., Ltd.

Aisin Seiki Kabushiki Kaisha

Akihito Hongoya

Takaaki Kato

Hiroyuki Tsukamoto

Tsuyoshi Fukaya

Atsushi Tabata

Yasuo Hojo

Kagenori Fukumura

Kazuhisa Ozaki

Masaru Morise

Fumitomo Yokoyama

Masafumi Kinoshita

Akihiro Kuroyanagi

Takashi Ogawa

Kazumasa Tsukamoto

Satoru Kasuya

Takao Taniguchi

Mikio Iwase

Yoshiharu Harada

Takayuki Kawakami

Hideki Miyata

Haruhisa Suzuki

Yasunori Nakawaki

Yasunari Nakamura

Atsushi Hanawa

Nobuaki Takahashi

Tsuyoshi Yamaguchi

Toru Souda

Koichi Miyamoto

Yoshinori Shibayama

Makoto Hijikata

Akira Matsuo

Shoichi Sayo

Takahiro Torii

Katsuyuki Asaoka

Makoto Kaneso

Kamishima Hirofumi

Hirofumi Kamishima

An automatic transmission that includes an input shaft; an output shaft; and a speed change mechanism portion that shifts a rotation of the input shaft to be transmitted to the output shaft, wherein: the output shaft has a spline formed in a range in which the output shaft fits in a power transmission shaft included in a vehicle, and n-stage (n is an integer of at least 2) chamfering is performed on a larger diameter portion of the spline.

Automatic transmission

An automatic transmission in which first to third clutches which can couple an input shaft to a first element of a first multiple planetary gear set and second and fourth elements of the second multiple planetary gear set, respectively, are arranged on a front side of the first multiple planetary gear set. Thus, it is possible to prevent a situation in which disengaging of the third clutch in the first speed causes the fourth element of the first multiple planetary gear set to rotate in reverse and generate a large relative rotation with the first element.

An automatic transmission is provided having appropriately spaced gear ratios for eight forward speeds to be capable of obtaining a shift feeling in all of the eight speeds, and is reduced in size and weight. Rotation of an input shaft is transmitted to an output shaft at a speed selected from a plurality of shift speeds by first and second clutches selectively transmitting the rotation of the input shaft to first and second compound planetary gears, and by first to fourth brakes selectively fixing each element of the first and second compound planetary gears, the first compound planetary gear includes first and second sun gears, a common carrier rotatably supporting a long pinion and a pinion, and a common ring gear that meshes with the first sun gear through the long pinion or the pinion and also meshes with the second sun gear through the long pinion and the pinion.

In single pinion planetary gear mechanisms, a second sun gear is linked to an input shaft in a power-transmissible manner, a first sun gear is linked to a third control brake, and a first carrier and a second ring gear which are linked to each other are linked to a first control brake. In single pinion planetary gear mechanisms, a third sun gear and a fourth sun gear which are linked to each other are linked to the input shaft disengageably by a first control clutch, and a third ring gear and a fourth ring gear are linked to a second control brake and a fourth control brake, respectively. Furthermore, in the single pinion planetary gear mechanisms, a third carrier is linked to the input shaft disengageably by a second control clutch and a fourth carrier is linked to an output shaft.

To provide an automatic transmission apparatus for forward 8-speed, which keeps a transmission gear ratio step in good balance. The apparatus includes: a first planetary gear device PGhaving a ring gear Rconnected to an input shaft; a second planetary gear device PGhaving a carrier Cconnected to a carrier Cof the first planetary gear device, and a sun gear Sconnected to R; a third planetary gear device PGhaving a ring gear Rconnected to C; a fourth planetary gear device PGhaving a sun gear Sconnected to a sun gear Sof the third planetary gear device; a first clutch C-that selectively connects Sto the input shaft; a second clutch C-that selectively connects Cto the input shaft; a first brake B-that selectively regulates the rotation of R; a second brake B-that selectively regulates the rotation of R; a third brake B-that selectively regulates the rotation of S; and a fourth brake B-that selectively regulates the rotation of R. The apparatus further includes a third clutch C-that connects Rand Sto the input shaft, or connects Rto C. PGto PGare each provided as a single pinion type.

An oil pump includes a pump cover covering a recess in a side face of a pump body to form a gear compartment therebetween. A drive gear and a rotatably driven gear are meshed and mounted in the gear compartment. Working spaces R are formed by the engagement of the meshed gear teeth. Discharge ports are formed in both the pump body and the pump cover in communication with the gear compartment. A notch is formed in the pump body at the bottom of the gear compartment and extends from the front end of the discharge port in the pump body to the rear end of a discharge area for the working spaces. Another notch is formed in the inner side face of the pump cover, and extends from the front end of the discharge port in the cover to the rear end of the discharge area.

Oil pump and automatic transmission including the same

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

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Okazaki, Japan

Akihito Hongoya