Mazda Motor Corporation

Kensuke Ueda

Tatsuhiko Iwasaki

Masanori Sasaki

Norio Iwashita

Masamichi Fujikawa

Kazuhiro Yamada

Shinya Kamada

Tatsutoshi Mizobe

Toshihisa Marusue

Tomotaka Ishizaka

Junichi Doi

Tokimori Saka

Takamichi Teraoka

Hideo Toyota

Narihito Hongawara

Naohiro Sakaue

Kyosei Nakashima

Yasuo Miura

Takeyuki Tanaka

Hirokazu Kouno

Takashi Miyamoto

Ryohei Hanamure

Siyuan Tao

Sayaka Katayama

An automatic transmission is provided, which includes a transmission case having a vertical wall part, a clutch disposed on a first side of the vertical wall part in an axial direction, a given component disposed on the second side of the vertical wall part, and a sleeve having a cylindrical body and a flange part coupled to the second side of the vertical wall part and disposed radially inward of the given component. The hydraulic fluid is supplied to the clutch from radially inward of the clutch through the vertical wall part. An oil supply passage is configured to supply the hydraulic fluid to the radially inward of the clutch through a first oil passage extending in the axial direction via a coupling part between the vertical wall part and the flange part, a second oil passage inside the flange part, and a third oil passage inside the cylindrical body.

Automatic transmission

A power transmission device in an automatic transmission includes a friction tightening element (a second brake) having a drum member, and a transmission path constituent member (a third ring gear) coupled to the drum member via a coupling part extending circumferentially along the drum member, the drum member having low-rigidity parts (long holes) provided at a plurality of circumferential positions on the drum member in at least one of portions radially outside and inside the coupling part.

Automatic transmission power transmission device

An automatic transmission includes: a brake device including a friction plate set configured with fixation friction plates and rotation friction plates alternately arranged, a piston, and an oil pressure chamber supplied with oil pressure that moves the piston toward the friction plate set side; a first rotating member; and second and third rotating members arranged at both respective axial sides of the first rotating member and each having an outer diameter smaller than that of the first rotating member. The friction plate set and the oil pressure chamber are arranged at both respective axial sides of the first rotating member and also arranged at an outer periphery side of the second rotating member and at the outer periphery side of the third rotating member, respectively. The piston extends from the oil pressure chamber toward the friction plate set side through the outer periphery side of the first rotating member.

An automatic transmission is provided, which includes a double-sun-gear-type planetary gear set including coaxial first and second sun gears, a ring gear, a pinion meshed with the sun gears and the ring gear, and a carrier supporting the pinion and having a pinion shaft and a carrier body. The carrier body includes first and second plates supporting the pinion shaft, a coupling part coupling the first and second plates, and a center plate extending inward in radial directions of the gear set from the coupling part by passing between the sun gears, and coupled to a rotational member. An inlet port is formed at an inner circumferential end of the center plate, and a center plate oil path extends radially outward from the inlet port. A lubricant oil supply path communicates with a bearing from the inlet port through the center plate oil path.

Automatic transmissionincludes second friction platesconnecting a second drumto a second hub, a second engagement hydraulic chamber, a second centrifugal balance chamber, and a second pistonengaging and disengaging the second friction plates. The second centrifugal balance chamberoverlaps the second friction platesin the axial direction in the automatic transmission. The automatic transmissionfurther includes a second oil passagefor discharging hydraulic oil in the second centrifugal balance chamberto a position not overlapping the second friction platesin the axial direction.

An automatic transmission has first, second and third gear sets, first and second clutches, and first, second and third brakes. First, second and third sun gears, and a first carrier are interconnected with a second sun gear, a second carrier, a third carrier, an input shaft and an output gear, respectively. The first clutch selectively connects the first sun gear and the second sun gear to the input shaft, and the second clutch selectively connects the first ring gear and the second carrier to the input shaft. The first brake selectively connects the first ring gear and the second carrier to a casing. The second brake selectively connects the second ring gear and the third carrier to the casing, and the third brake selectively connects the third ring gear to the casing.

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Aki-gun, Japan

Kensuke Ueda