Abstract: An automatic transmission includes an input shaft, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. The engagement mechanism includes first to seventh engagement devices. Nine or more forward transmission gear ratios are established by setting each of at least three engagement devices among the first to seventh engagement devices in an engagement mode.

Abstract: An automatic transmission includes an input shaft, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. Each of a plurality of gear ratios is provided by setting at least three of first to third clutches and first to third brakes in a connection state.

Abstract: An automatic transmission includes an input shaft, a first planetary gear mechanism, a second planetary gear mechanism, a third planetary gear mechanism, a fourth planetary gear mechanism, a first engagement device, a second engagement device, a third engagement device, a fourth engagement device, a fifth engagement device, a sixth engagement device, and a seventh engagement device. Ten forward gears of the automatic transmission are established by bringing at least three of the first to seventh engagement devices into the engagement state.

Abstract: An automatic transmission includes an input shaft, first to fourth planetary gear mechanisms and first to seventh engagement devices. Ten forward gears of the automatic transmission are established by bringing at least three of the first to seventh engagement devices into an engagement state.

Abstract: An automatic transmission includes an input shaft, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. The engagement mechanism includes first to seventh engagement devices. Nine or more forward transmission gear ratios are established by setting each of at least three engagement devices among the first to seventh engagement devices in an engagement mode.

Abstract: A vehicle engine starting device includes a drive starter gear provided on an output shaft of a transmission and a driven starter gear provided on a crankshaft of an engine are meshed, not only is it possible to start the engine by cranking the crankshaft by means of the driving force transmitted from a driven wheel without requiring a starter motor, but it is also possible to prevent the dragging of the transmission since the driving force is not transmitted to the crankshaft via the transmission. Further, since the gear ratio of the drive starter gear and the driven starter gear is set so that the rotational speed of the crankshaft attains a rotational speed that can start the engine when the vehicle speed reaches a predetermined vehicle speed for starting the engine, it is possible to reliably start the engine by cranking the crankshaft at an optimum speed.

Abstract: Provided is an automatic transmission capable of reducing friction loss. The automatic transmission is provided with an input shaft (2) coupled with a sun gear (Sa), an output member (3), a first to third planetary gear mechanisms (4, 5, 6), a first engagement mechanism (C1) coupling the input shaft (2) with a ring gear (Rc) releasably, a second engagement mechanism (C2) coupling a carrier (Ca) with a carrier (Cc) releasably, a third engagement mechanism (C3) coupling the carrier (Ca) with a second coupling body (Rb-Sc) releasably, a fourth engagement mechanism (B1) fixing a first coupling body (Ra-Cb) to a transmission case (1) releasably, a fifth engagement mechanism (B2) fixing a sun gear (Sb) to the transmission case (1) releasably, and a sixth engagement mechanism (B3) fixing the ring gear (Rc) to the transmission case (1) releasably.

Abstract: An automatic transmission includes an input shaft, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. The engagement mechanism includes first to sixth engagement assemblies. Each of a plurality of gear ratios is provided by setting three of the first to sixth engagement assemblies in a engagement state.

Abstract: An automatic transmission includes a single-pinion first planetary gear mechanism including a first sun gear, a first ring gear, and a first carrier that each correspond to one of first to third elements in a velocity diagram. A double-pinion second planetary gear mechanism includes a second sun gear, a second ring gear, and a second carrier that each correspond to one of fourth to sixth elements in a velocity diagram. The fifth element is connected to the second element to form a first connected body that is connected to an input shaft. A single-pinion third planetary gear mechanism includes a third sun gear, a third ring gear, and a third carrier that each correspond to one of seventh to ninth elements in a velocity diagram. The eighth element is connected to an output member, and the ninth element is connected to the third element to form a second connected body.

Abstract: An automatic transmission includes a first single-pinion planetary gear mechanism including a first sun gear, a first ring gear, and a first carrier that each correspond to one of first to third elements in a velocity diagram. The second element is connected to the input shaft. A second single-pinion planetary gear mechanism including a second sun gear, a second ring gear, and a second carrier that each correspond to one of fourth to sixth elements in a velocity diagram. The fourth element is connected to the first element to form a first connected body. A double-pinion third planetary gear mechanism includes a third sun gear, a third ring gear, and a third carrier that each correspond to one of seventh to ninth elements in a velocity diagram. The eighth element is connected to the fifth element to form a second connected body that is connected to the output member.

Abstract: An automatic transmission includes an input shaft, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. The engagement mechanism includes first to sixth engagement assemblies. Each of a plurality of gear ratios is provided by setting three of the first to sixth engagement assemblies in a engagement state.

Abstract: An automatic transmission includes an input shaft, an output member, a first planetary gear system, a second planetary gear system, a third planetary gear system, a fourth planetary gear system, and an engagement mechanism. The input shaft is configured to be rotated with power of a driving source relative to the transmission case. The output member is to output rotation of the input shaft using multiple gear-shifting. The multiple gear-shifting is provided by setting at least three of first to third clutches and first to third brakes in a connection state.

Abstract: An automatic transmission includes an input shaft, an output member, a first planetary gear set, a second planetary gear set, a third planetary gear set, a fourth planetary gear set, and an engagement mechanism. Each of a plurality of gear ratios is provided by setting at least three of first to third clutches and first to third brakes in a connection state.

Abstract: An automatic transmission includes a first single-pinion planetary gear mechanism including a first sun gear, a first ring gear, and a first carrier that respectively correspond to first to third elements in a velocity diagram. A second single-pinion planetary gear mechanism includes a second sun gear, a second ring gear, and a second carrier that respectively correspond to fourth to sixth elements in a velocity diagram. The fourth element is connected to the first element to form a first connected body. A double-pinion third planetary gear mechanism includes a third sun gear, a third ring gear, and a third carrier that respectively correspond to seventh to ninth elements in a velocity diagram. The ninth element is connected to the third element to form a second connected body. The eighth element is connected to the fifth element to form a third connected body.

Abstract: An automatic transmission that includes two adjacent clutches. Two clutches each include a clutch drum, a piston that structures an operating oil chamber with a portion of the clutch drum used as a cylinder, a plurality of friction plates that engage with the clutch drum, a cancel oil chamber that is arranged on a back surface side of the piston and that cancels a centrifugal oil pressure acting on the operating oil chamber, and a return spring that is provided within the cancel oil chamber and that is structured between a cancel plate and a back surface of the piston and that biases the piston toward the operating oil chamber.

Abstract: An automatic transmission includes a first single-pinion planetary gear mechanism including a first sun gear, a first ring gear, and a first carrier that respectively correspond to first to third elements in a velocity diagram. A second single-pinion planetary gear mechanism includes a second sun gear, a second ring gear, and a second carrier that respectively correspond to fourth to sixth elements in a velocity diagram. The fourth element is connected to the first element to form a first connected body. A double-pinion third planetary gear mechanism includes a third sun gear, a third ring gear, and a third carrier that respectively correspond to seventh to ninth elements in a velocity diagram. The ninth element is connected to the third element to form a second connected body. The eighth element is connected to the fifth element to form a third connected body.

Abstract: An automatic transmission includes a single-pinion first planetary gear mechanism including a first sun gear, a first ring gear, and a first carrier that each correspond to one of first to third elements in a velocity diagram. A double-pinion second planetary gear mechanism includes a second sun gear, a second ring gear, and a second carrier that each correspond to one of fourth to sixth elements in a velocity diagram. The fifth element is connected to the second element to form a first connected body that is connected to an input shaft. A single-pinion third planetary gear mechanism includes a third sun gear, a third ring gear, and a third carrier that each correspond to one of seventh to ninth elements in a velocity diagram. The eighth element is connected to an output member, and the ninth element is connected to the third element to form a second connected body.

Abstract: An automatic transmission includes a first single-pinion planetary gear mechanism including a first sun gear, a first ring gear, and a first carrier that each correspond to one of first to third elements in a velocity diagram. The second element is connected to the input shaft. A second single-pinion planetary gear mechanism including a second sun gear, a second ring gear, and a second carrier that each correspond to one of fourth to sixth elements in a velocity diagram. The fourth element is connected to the first element to form a first connected body. A double-pinion third planetary gear mechanism includes a third sun gear, a third ring gear, and a third carrier that each correspond to one of seventh to ninth elements in a velocity diagram. The eighth element is connected to the fifth element to form a second connected body that is connected to the output member.

Abstract: An automatic transmission that includes two clutches that are provided in mutually different positions in a radial direction while overlapping each other in an axial direction. The two clutches each include a clutch drum; a piston that structures a operating oil chamber while using a part of the clutch drum as a cylinder; a plurality of friction plates that engage the clutch drum; and a cancel oil chamber that is disposed on a back face side of the piston and that cancels a centrifugal hydraulic pressure acting on the operating oil chamber.

Abstract: An automatic transmission that includes one clutch that includes a clutch drum; a piston that forms a hydraulic oil chamber using a part of the clutch drum as a cylinder; a plurality of friction plates that engage with the clutch drum; and a cancel oil chamber that is provided on a rear side of the piston and that cancels a centrifugal oil pressure that acts on the hydraulic oil chamber. Oil is supplied to the cancel oil chamber from a boss portion formed in the clutch drum on a radially inner side, and the oil is discharged from discharge holes formed in the boss portion to an outside of a hydraulic oil chamber side of the clutch drum.