Abstract: A gear train for transmitting the rotation from an input shaft to an output shaft is constituted such that a plurality of speeds are set by a plurality of planetary gear sets, each of which is provided with components including a sun gear, a ring gear and a carrier, and one of the planetary gear sets on one of the speeds does not participate in the transmission of torque from the input shaft to the output shaft. Also, single or a plurality of uniting clutches are provided to selectively interconnect at least either two of the components in the planetary gear set adapted not to participate in the transmission of torque.

Abstract: An automatic transmission, in which a gear train including a plurality of planetary gear sets each composed of a sun gear, a carrier and a ring gear is accommodated in a casing so that the transmission of a drive force from an input shaft to an output shaft may be changed to set a plurality of gears. The automatic transmission includes a first brake connected to the carrier of the first one of the plural planetary gear sets for fixing the same to the casing; a first clutch arranged at the same side as is the connecting position of the carrier and the first brake means with respect to the first planetary gear set for connecting the carrier selectively to a rotating member such as the sun gear, carrier or ring gear of one of other planetary gear sets; and a second clutch arranged closer to the first planetary gear set than it is to the first clutch for connecting the sun gear of the first planetary gear set selectively to the rotating member.

Abstract: A gear train for changing the rotational speed of an input shaft to transmit the resultant rotation to an output shaft consists of single pinion type first and second planetary gear sets and a double pinion type third planetary gear set.

Abstract: A speed changing gear device for a motor vehicle, including a first and a second single-pinion type planetary gear unit and a third double-pinion planetary gear unit, which are coaxially disposed so as to provide different speed reduction ratios. The three gear units have respective first, second and third sun gears, respective first, second and at least one pair of planetary pinions, respective first, second and third ring gears, and respective first, second and third carriers. The first and third ring gears are fixed to each other for rotation as a unit, or connectable to each other by clutch means. The first sun gear and the second ring gear are fixed to each other or connectable by clutch means. The second and third carriers are fixed to each other or connectable to each other by clutch means. The second and third sun gears are fixed to each other or connectable by clutch means.

Abstract: An automatic transmission having a gear train comprising first, second and third single-pinion planetary gear sets. The ring gear of the first single-pinion planetary gear set is connected integrally or selectively to the carrier of the second single-pinion planetary gear set, the carrier of the first single-pinion planetary gear set is connected integrally or selectively to the ring gear of the third single-pinion planetary gear set is connected integrally or selectively to the carrier of the third single-pinion planetary gear set, and the sun gear of the second single-pinion planetary gear set is connected integrally or selectively to the sun gear of the third single-pinion planetary gear set. The automatic transmission is capable of being placed in any one of at least five forward gears and one reverse gear.

Abstract: A gear train for changing the rotational speed of an input shaft to transmit the resultant rotation to an output shaft consists of single pinion type first and third planetary gear sets and a double pinion type second planetary gear set. A sun gear of the first planetary gear system is normally or selectively connected to a carrier of the third planetary gear set, the carrier of the third planetary gear set is normally or selectively connected to a sun gear of the second planetary gear set, a carrier of the first planetary gear set is normally or selectively connected to a ring gear of the third planetary gear set, a ring gear of the first planetary gear set is normally or selectively connected to a ring gear of the second planetary gear set, the sun gear of the second planetary gear set is normally or selectively connected to a sun gear of the third planetary gear set, whereby at least five forward speeds and one reverse are permitted to be set.

Abstract: A transmission including a first and a second single-pinion planetary gear unit and a third double-pinion planetary gear unit, which are coaxially disposed so as to provide different speed reduction ratios. The three gear units have respective first, second and third sun gears, respective first, second and third planetary gears, respective first, second and third ring gears, and respective first, second and third carriers. The first and second sun gears are fixed to each other for rotation as a unit, or connectable to each other by a coupling device. The first carrier and the second ring gear are fixed to each other or connectable by a coupling device. The first and third ring gears are fixed to each other or connectable to each other by a coupling device. The second and third carriers are fixed to each other or connectable by a coupling device. This arrangement allows shifting operations of the transmission, without racing of the engine or locking of the transmission.

Abstract: An automatic transmission including gear trains, which are constructed of at least three planetary gear sets each having three rotating members. A first clutch is arranged closer to an input shaft than the first planetary gear set for connecting any one of the rotating members of the first planetary gear set arranged adjacent to the input shaft. A second clutch is also arranged closer to the input shaft than the first planetary gear set for connecting another of the rotating members of the first planetary gear set and the input shaft. A third clutch is interposed between the first planetary gear set and the second planetary gear set for connecting any one of the rotating members of the second planetary gear set arranged at the opposite side to the input shaft across the first planetary gear set and the any one or the another of the rotating members of either one of the first clutch and the second clutch or the first planetary gear set.

Abstract: Herein disclosed is a brake system for use with an automatic transmission for braking a rotatable member such as a brake drum, which is accommodated in a casing and connected to the sun gear or the like of a planetary gear mechanism, by bringing a brake band having two ends into contact with the outer circumference with the rotatable member.

Abstract: A planetary gear type speed change device having two simple planetary gear mechanisms positioned axially adjacent with one another with each carrier thereof being connected with each ring gear of the other, three clutches and three brakes assembled together between an input rotational member and an output rotational member so as to provide six monotonously changing gear ratios between the input and the output rotational members according to combinations of engagement and disengagement of the three clutches and the three brakes.

Abstract: Herein disclosed is a transaxle casing to be used with a transverse type automatic transmission. An arcuate partition extending from the top to the bottom of a transmission gear case is disposed between the radially outermost rotary member of the transmission gear seat and a cover wall and in front of the transmission gear set with respect to the running direction of a vehicle. An oil sump is disposed below the transmission gear set. Thus, the lubricating oil splashed away the rotary member is guided into an oil return passage extending between the partition and the cover wall and opening into the oil sump so that it may be prevented from being caught again by the transmission gear set and heated to a high temperature.

Abstract: A transmission for a vehicle wherein a single pinion type planetary gear mechanism and a double pinion type planetary gear mechanism are operatively combined by clutches and brakes in various manners to provide five or even six speed stages and a reverse stage, the overall gear ratio between the lowest speed stage and the highest speed stage thereof being relatively small in spite of the five or even six speed stages. The transmission, by further incorporating one way clutches, is generally shifted between each two adjacent speed stages by only newly putting one of the clutches or brakes into engagement or out of engagement with no need of timely related operations of other clutches or brakes.