Abstract: Power output produced by an engine changes depending upon different fuel, in octane number, supplied thereto. In order to meet this change in the engine power output, a transmission drivingly connected to the engine is selectively set at different states, each corresponding to the fuel supplied to the engine.

Abstract: A final gear train includes a differential case rotatably mounted within a bell shaped portion of a transmission case between it and a bearing retainer attached to the transmission case by means of two bearings, one bearing being disposed at the bottom of the bell shaped portion, the other bearing disposed around a portion of the bearing retainer to rotatably support a final gear attachment portion of the differential case. The final gear attachment portion is in the form of an axially extending annular portion axially extending from a main body portion of the differential case. This bearing arrangement provides a strong radial rigidity to the final gear attachment portion and prevents deformation of the final gear attachment portion during the transmission of torque.

Abstract: A converter fluid supply passage is situated between a transmission input shaft and a pilot sleeve shaft and a converter fluid return passage is defined between the transmission input shaft and the stationary sleeve shaft extension so that the annular space between the pump drive shaft and the transmission input shaft may be used only as a lockup control passage.

Abstract: The present invention concerns an automatic transaxle wherein connecting passages between an oil pan and a final gear chamber are arranged at a higher level, being formed in the bottom portion of a transmission chamber wall above the oil pan. The transmission chamber also communicates with the final gear chamber. Oil flows between the final gear chamber and oil pan only through the connecting passages so that the oil level in the oil pan will not drop below the level of an oil intake port.

Abstract: An automotive automatic power transmission system having a torque converter contained in a converter housing and a planetary gear system powered by the torque converter. The planetary gear system is contained in a gear housing detachably secured to the converter housing. The planetary gear system has an output shaft carrying an output gear meshing with an idler gear which is in turn in meshed relationship with a driven gear of a final drive unit. The aforesaid gears are of the helical type and are rotatable about parallel axes, with a resulting axial thrust on the output shaft in a direction towards the planetary gear system during rotation of the output gear in the forward direction. The output shaft is journalled between first and second thrust bearings, with the first thrust bearing being carried on a hollow member detachably fixed to the converter housing and protruding axially therein to support the torque converter stator on a one-way clutch.

Abstract: Front-drive automatic transmission includes an output gear positioned between a planetary gear system and a hydrokinetic torque converter. A differential is provided to deliver torque from the output gear to each of two axle shafts. A transmission case for the planetary gear system and a torque converter housing for the torque converter are connected to each other to define an interface which lies in a plane disposed outboard of the inboard face of the output gear with respect to the gear system. The transmission case is formed with a valve cover attachment surface which extends up to a location adjacent the plane.

Abstract: A drum member has a circular base portion and a cylindrical side portion which is formed with holes at positions facing a brake band wrapping the drum member. A cylindrical member is coaxially disposed within the drum member with its one longitudinal end entirely secured to the inside surface of the circular base portion of the drum member. The cylindrical member is formed with holes or openings and is formed with longitudinally extending spline portions to which clutch plates are splined. The other end of the cylindrical member is entirely in contact with the inner surface of the cylindrical side portion of the drum member so that an enclosed chamber is defined by the drum member and the cylindrical member.

Abstract: A transmission case of an automatic transmission is formed with a fluid passage fluidly connecting a fluid pressure pump to a hydraulic control valve body for controllably operating a planetary gear system disposed in the case. The fluid passage is located adjacent a closed end of the transmission case and connected to control valve body in order to reduce the overall length of the transmission case in its axial direction.

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: 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 solenoid plunger and a retaining hole lock a selector lever inoperative when the transmission is in the neutral or parking position and a safety belt of a driver's seat is not worn, without hindering the car engine from being started. A switch unrelated to engine ignition and responsive to the wearing of the safety belt governs a current flow through the solenoid, so that the selector lever becomes operative when the safety belt is worn.