Abstract: A V-belt type stepless transmission, comprising: an input pulley and an output pulley mounted on parallel input and output shafts, respectively, each pulley having a stationary flange and a movable flange axially displaceable relative to the stationary flange and rotatable integrally therewith; an endless V-belt lapped around the input and output pulleys to transmit power therebetween, a servo mechanism for the movable flange, including a drive member having a first screw or a second screw, the first screw formed on the movable flange or on a structure integrally connected to the movable flange, the second screw threadedly engaged with the first screw for axially displacing the movable flange by rotation of the second screw relative to the first screw, and a brake provided between the drive member and a transmission case for braking the drive member, and a torsion spring interposed between the movable flange and the drive member; anda cam mechanism provided at least on one of the input and output shafts to va

Abstract: A V-belt type stepless transmission, basically including an input pulley and an output pulley mounted on parallel input and output shafts, respectively, each of the input and output pulleys having a stationary flange and a movable flange axially displaceable relative to the stationary flange and rotatable integrally therewith; an endless V-belt lapped around the input and output pulleys to transmit power therebetween; a servo mechanism for the movable flange, constituted by a drive member having a first screw or a second screw, the first screw formed on the movable flange or on a structure integrally connected to the movable flange, the second screw threadedly engaged with the first screw for axially displacing the movable flange by rotation of the second screw relative to the first screw, and a drive mechanism for the drive member; and a cam mechanism provided at least on one of the input and output shafts to vary compressive belt gripping force of the stationary and movable flanges in proportion to the torq

Abstract: An automatic transmission provided with a combination of a belt drive continuously-variable speed transmission mechanism and a hydraulic control circuit. The belt drive continuously-variable speed transmission mechanism has an input variable-pitch pulley assembly and an output variable-pitch pulley assembly. The hydraulic control circuit includes a regulator valve, a throttle pressure valve, a reduction ratio detecting valve, a reduction ratio control valve and a reduction ratio control mechanism. The reduction ratio control valve has an axially slidable spool and two pressure chambers formed in the valve body thereof at both axial ends of the spool respectively. The reduction ratio control mechanism includes conduits for conducting the working fluid of a throttle pressure to the pressure chambers of the reduction ratio control valve and two solenoid valves adapted to drain the corresponding pressure chambers, respectively, when actuated.

Abstract: A stepless or continuously variable automatic transmission for motor vehicle, including a first shaft coupled with the output shaft of the engine and rotatably supported by the transmission case consisting of a torque converter case accommodating a fluid joint, a transmission case fastened to the torque converter case and accommodating a V-belt type stepless transmission and a center case interposed between the torque converter and transmission cases; a second shaft disposed parallel with the first shaft and supported by the transmission case rotatably at three support points on the torque converter case, transmission case and center case; and a third shaft disposed parallel with the second shaft and rotatably supported by the transmission case, transmitting power from the first to second shaft by the V-belt type stepless transmission and from the second and third shaft by meshed engagement with a helical output gear mounted on the second shaft and a helical input gear mounted on the third shaft, the stepless

Abstract: A stepless or continuously variable automatic transmission for motor vehicles including a first shaft coupled with the output shaft of an engine and rotatably supported by the transmission case, a second shaft disposed parallel with the first shaft and supported by the transmission case rotatably at three support points, and a third shaft disposed parallel with the second shaft and rotatably supported by said transmission case, transmitting power from said first to second shaft by a V-belt type stepless transmission and from the second to third shaft by meshed engagement of an output gear mounted on the second shaft and an input gear mounted on the third shaft, said stepless automatic transmission being characterized in that: the second shaft is divided into an input section mounting an output pulley of said V-belt type stepless transmission and an output section mounting the output gear, one of the input and output sections being rotatably supported at one outer support point and an intermediate support poin

Abstract: An overdrive unit in an automatic transmission having a planetary gear set including a helical gear and a thrust bearing interposed between the sun gear and revolving carrier for supporting any thrust loads produced between the sun gear and the carrier, thereby reducing the amount of any external force to be exerted on the outer race of the one-way clutch and thus improving the durability of the one-way clutch.

Abstract: In a belt type stepless shifter, movable flanges of pulleys are driven by hydraulic cylinders, and each of the cylinders is provided with a plurality of pressure carrying surfaces disposed in the axial direction, thereby a great amount of torque can be transmitted at low hydraulic pressure or at a small outer diameter. The belt type stepless shifter is adapted for use in a transmission apparatus of vehicles.

Abstract: Hydraulic control means for an automatic transmission having an improved shift valve which reduce the speed change shock at the speed change. Said shift valve has a sleeve having an oil chamber in which throttle pressure is put and an oil chamber by which governor pressure or servo pressure is received, a spring installed withstands the throttle pressure and governor pressure or servo pressure, and a spool which installs an oil chamber wherein the above-mentioned governor pressure is put, opens(closes) an oil passage connecting to the above-mentioned friction elements when the pressure in this oil chamber is more than the appointed value, and closes or opens the oil passage when the pressure is less than the appointed value, said spool forming an oil chamber wherein the servo pressure or governor pressure supplied to an oil chamber of the above-mentioned sleeve is put when the governor pressure is less than the appointed value.

Abstract: The transmission comprises a hydraulic power transmission device, a V-belt stepless shifter and a planetary gear train. At restart time when the vehicle is at rest with the V-belt stepless shifter in high gear, the hydraulic power transmission device is operated to shift for providing a relatively high torque ratio, rather than the V-belt stepless shifter. A smooth restart is thus made possible. In addition, the planetary gear train permits the shifter smoothly to switch between forward and reverse. Both features meet the transmission needs of all vehicles.

Abstract: A pressure regulating device for use in a hydraulic control system for an automatic transmission having a torque convertor, a gear transmission and an hydraulic control system provides a first pressure regulating valve for regulating the pressurized fluid output from a pump to a line pressure level, and applying the line pressure to the hydraulic control system. A second pressure regulating valve regulates the pressure of an excess portion of fluid supplied to the hydraulic control system from the first pressure regulating valve, and supplies the excess fluid to the torque convertor and regions requiring lubrication. Overheating of fluid in the torque convertor is prevented at low pressures by a bypass passage which assures at least a minimum fluid flow through the torque convertor at all times.

Abstract: An overdrive unit in an automatic transmission having a planetary gear set including a helical gear and a thrust bearing interposed between the sun gear and revolving carrier for supporting any thrust loads produced between the sun gear and the carrier, thereby reducing the amount of any external force to be exerted on the outer race of the one-way clutch and thus improving the durability of the one-way clutch.

Abstract: A one-way brake having end bearings the support wall of each of which is protruded at the inner race side portion thereof in the outward direction with respect to a space between inner and outer races from that surface of the support wall which is contacted by a support means connected to the outer race, to thereby increase the area of that portion of the inner race which is in sliding contact with an inner rib of the support wall. Accordingly, the wear resistance and stiffness of the end bearings can be increased without increasing an attaching space.

Abstract: A governor hydraulic pressure supply apparatus is provided for use with the vehicle automatic transmission system and includes a governor valve mounted on a rotary output shaft from the automatic transmission, the output shaft having an internal input fluid line for supplying a line pressure to the governor valve and an internal output fluid line receiving a governor pressure from the governor valve, and the governor valve body having an internal input fluid line to be connected to the input line from the output shaft and an internal governor pressure output line to be connected to the output line in the shaft, wherein the joined faces between the governor valve and output shaft at which the fluid lines are respectively connected with each other are brought in close contact with each other by tightening the two element by means of a tightening bolt adjacent to the joined faces, thereby preventing fluid leak from the faces.

Abstract: In an hydraulic control system for an automatic transmission of a vehicle, when a low range frictional engagement mechanism is engaged in response to shift-down operation of the transmission, a flow regulator valve serves to steplessly regulate flow of fluid from a source of line pressure to the low range frictional engagement mechanism in accordance with changes of travel speed of the vehicle.

Abstract: An accumulator for a hydraulic control system of frictional engagement mechanisms comprises a housing with a stepped bore, a first stepped piston reciprocable within the bore to form a back pressure chamber communicated with a source of line pressure, a second piston reciprocable within the first piston in a predetermind stroke to form an accumulation chamber communicated with the line pressure source, and a spring for biasing the second piston toward the accumulation chamber. In the initial stage, only the second piston is retracted against biasing force of the spring to modulate the line pressure acting on the frictional engagement mechanisms and is engaged at its retracted stroke end with the first piston. Subsequently, the first piston is retracted together with the second piston against the biasing force and the pressure in the back pressure chamber to further modulate the line pressure.