Abstract: A set of planetary pinions forming part of a planetary gear system are meshed with a ring gear which is secured to a power output shaft operatively connected to a final drive unit. The ring gear is formed at its outer peripheral surface with teeth of worm which mesh with a worm wheel connected to a governor valve body for producing a governor pressure in accordance with the rotational speed of the power output shaft.

Abstract: In a hydraulic control system of an automatic power transmission is provided a first-second gear shift valve which is to be acted upon through only one fluid inlet port by a signal fluid pressure representative of a manual first forward drive range selected at the manually operated gear shift lever, the port being used not only as the port to receive the signal fluid pressure but as a switching port so that the shift valve is conditioned to produce the first gear in the transmission mechanism in the presence of the signal fluid pressure.

Abstract: Grooves formed in a cylindrical member of the high-and-reverse clutch are designed to receive therein detents or teeth of clutch plates respectively and each of openings formed in a drum member of forward drive clutch is designed to receive therein at least two adjacent teeth of each clutch plate so that these high-and-reverse and forward drive clutches can use common clutch plates.

Abstract: An output gear of a power transmission is drivably connected through an idler gear to an input gear of a final drive unit having a differential. The idler gear is mounted through a pair of tapered roller bearings on a sleeve shaft which is supported by opposite two walls between which the idler gear is located. An end portion of the sleeve shaft is adjustably received within a recess formed at the inner surface of one of the walls in a manner that a bolt securing the sleeve shaft is screwed into a boss formed in the recess of the wall.

Abstract: First and second bearings are arranged on either side of an output gear of the transmission to bear the same, and third and fourth bearings are arranged to bear an idler gear which meshes with the output gear to transmit the revolution of the output gear to a final drive assembly mounted on a side of the transmission. The first bearing is supported by part of a converter housing, the second bearing is supported by a separate member disposed within and detachably connected to the converter housing, and the third and fourth bearings are supported on a support which extends between the housing and the separate member.

Abstract: Simple passage structure of a lock-up torque converter is disclosed. With this passage structure an output shaft without any circumferential groove can be used. The output shaft has an axial passage and a radial passage communicating with the axial passage. A first spacer is mounted within an annular space between the output shaft and a stationary sleeve to divide the annular space into a first annular chamber and into a second annular chamber. The first annular chamber communicates with the inside of a turbine runner, while the second annular chamber communicates with the radial passage of the output shaft and with a control valve. A second spacer is mounted axially spaced from the first spacer and forms with the first annular spacer the second annular chamber. The second annular chamber and the radial and axial passages of the output shaft provide communication between the control valve and a clutch chamber of a direct drive clutch.

Abstract: A governor is disclosed in which dust which may comprise steel powder, fine particles of sand and so on will be removed from a hydraulic working fluid by subjecting the working fluid to centrifugal force. A fluid passage for the working fluid is formed in a housing of the governor and a chamber communicates with the passage at the opening. The fluid passage has an opening located such that dust contained in working fluid will enter into the chamber through the opening while the housing is rotating. Within the chamber working fluid will be stagnant and dust sedimented.

Abstract: In an automatic power transmission including hydrodynamic torque transmitting means such as a torque converter or a fluid coupling and fluid-operated direct-drive clutch means combined with the torque converter or fluid coupling, control valve means is provided so that the direct-drive condition is achieved from the top-gear condition at a retarded timing after the top gear has been attained under low-load conditions of the engine although direct-drive condition is established simultaneously when an upshift is made to the top gear under high-load operating conditions of the engine.

Abstract: A four-speed transmission having an over drive is disclosed which comprises two basic planetary gearsets and one dual intermeshed planet pinion planetary gearset and three clutches and two brakes. The construction and arrangement is such that an appropriate reduction ratio is provided for each of forward speeds without causing rotary members between input and output shaft to rotate faster than the input and output shafts.

Abstract: A hydraulic system for an automatic power transmission of a motor vehicle and adapted for preventing creep of the motor vehicle when the vehicle comes to a complete halt. The hydraulic system includes a first shift valve responsive to throttle pressure and governor pressure to control supply of line pressure into servo means for actuating a friction element to provide lower gear reduction ratio, and a second shift valve responsive to released condition of an accelerator pedal of the vehicle for supplying line pressure into a governor pressure port of the first shift valve, whereby the first shift valve is moved in dependence on throttle pressure and line pressure into a position to supply line pressure into the servo means for thereby effecting shift into the lower gear reduction ratio in the power transmission.

Abstract: A valve mechanism is comprised of first and second valves, the first valve producing a first fluid pressure in dependence on engine intake manifold vacuum while the second valve produces a second fluid pressure in response to the first pressure. A first valve spool is connected at its one end to a vacuum diaphragm responsive to the engine intake manifold vacuum. A valve spool land is exposed to the second pressurized fluid so that the spool is biased in one direction by the force developed by the second pressurized fluid acting on the valve land. A second valve spool is movable in response to the first fluid pressure to a position to reduce the pressure level of the second fluid when the engine intake manifold vacuum reaches a predetermined value.