Abstract: A transmission includes an input shaft; a torque converter having an output and having an input drivingly connected to the input shaft, the torque converter being axially aligned with the input shaft; an infinitely variable V-belt transmission unit including a primary shaft and a secondary shaft, the primary and secondary shafts being parallel to and offset from the input shaft and torque converter; a transmission output shaft drivingly connected to the secondary shaft; a first power path between the input shaft and the seconary shaft, including the torque converter and a first gear set drivingly connecting the output of the torque converter to the secondary shaft whereby the first power path does not make use of the V-belt transmission; and a second power path between the input shaft and the secondary shaft including a mechanical clutch drivingly connecting the input shaft through a second gear set with the primary shaft whereby the secondary shaft is driven by the V-belt transmission.

Abstract: A process for machining the transverse elements of a composite driving belt having a substancially trapezoidal cross-section and intended for use on V-shaped pulleys, consisting of an endless carrier in the form of at least one metallic band and a plurality of transverse elements which rest against one another with the parallel parts of their principal faces and which have been mounted slidably on the carrier, by which the side faces (1, 1a) of the elements (1-2a) which will come into contact with the pulleys are roughened.

Abstract: Infinitely variable transmission for a device with an internal combustion engine (67) is provided with an endless transmission member (14) which has been looped over two pulleys, each having a running groove situated between conical pulley halves (2,3 and 8,9 resp.), at least one conical half of each pulley being axially movable through an associated hydraulic cylinder (4,12), also provided with a first control valve (40) for regulation of the fluid pressure in the cylinder (12) of the driven pulley and in the supply line to a second control valve (20), which second valve is intended for the adjustment of the transmission ratio by regulation of the amount of fluid supplied to and discharged from the cylinder (4) of the driving pulley. Devices have been provided for the operation of the first control valve (40) which bring about an increase or a decrease of the fluid pressure in the cylinder (12) of the driven pulley, depending on the movements of the engine block.

Abstract: A process for the assembly of a composite driving belt having a substantially trapezoidal cross-section and intended for use on V-shaped pulleys, consisting of an endless carrier in the shape of at least one metallic band and of a plurality of transverse elements which rest against one another with the parallel parts of their principal faces and which have been mounted slidably on the carrier, while lateral recesses have been provided for receiving the band(s), in such a fashion that the transverse elements are in contact with one another.

Abstract: An infinitely variable transmission has a primary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, a secondary pulley having a hydraulically shiftable disc and a hydraulic cylinder for operating the disc, and a belt engaged with both pulleys. A hydraulic circuit having a transmission ratio control valve is provided for shifting the disc of the primary pulley in the downshift direction and upshift direction. The transmission ratio control valve is operated to shift the disc of the primary pulley in the downshift direction when the throttle valve of the engine is rapidly opened for accelerating the engine.

Abstract: A system for controlling clutch torque for a vehicle having a transmission and an electromagnetic clutch provided between an engine and the transmission. The system comprises an engine speed sensor, a computing unit for determining the speed of a driven member of the electromagnetic clutch, an accelerator pedal switch for detecting the acceleration of the vehicle and for producing an acceleration signal, and a comparator for comparing the engine speed with the speed of said driven member and for producing an output when both speeds substantially coincide with each other. The system has an AND gate responsive to the acceleration signal and the output for producing a clutch engaging signal, thereby engaging the electromagnetic clutch.

Abstract: A system for controlling an infinitely variable transmission is provided with a vehicle speed sensor for sensing vehicle speed and for producing a signal when the vehicle speed exceeds a predetermined value, a neutral range sensor of the transmission, a drive range sensor, and an accelerator pedal release sensor. The system further has an actuator for cutting off fuel. When the vehicle coasts under conditions of the drive range, accelerator pedal release, and at a higher vehicle speed than the predetermined value, fuel is cut off. When the neutral range is selected under the fuel cut off state, the clutch is engaged with a delay.

Abstract: A system for controlling an electromagnetic clutch has a reference valve generator which produces clutch-engaging and clutch-disengaging engine speed signals in a low vehicle speed range. Engine speed is compared with the engine speed signals by a comparator. The clutch is engaged at a higher engine speed than a clutch disengaging speed and disengaged at a lower engine speed than a clutch engaging speed in accordance with the result of the comparison.

Abstract: A system for controlling clutch torque for a vehicle which has a transmission and an electromagnetic clutch provided between an engine and the transmission, the clutch current being increasing with increase of engine speed. The system comprises an engine speed sensor for sensing the speed of the engine and for producing an engine speed signal in proportion to the engine speed, and an acceleration detecting switch for producing an acceleration signal.A vehicle speed detecting unit is provided for sensing the vehicle speed and for producing an output when the vehicle speed reaches a predetermined value at a low engine speed.A clutch current control unit is provided to respond to the output of the vehicle speed detecting unit and to the acceleration signal for increasing the clutch current along at an inclination up to a rated current.

Abstract: A driving belt of the type comprising an endless carrier supporting a plurality of transverse elements is disclosed. The element includes at least one recess for receiving the carrier and is provided with a convex surface in the longitudinal and transverse directions for contacting the carrier. A method and apparatus for producing the curved surface includes a stationary hollow cylindrical grinding wheel and an apparatus for moving the element in an arcuate path while contacting the grinding wheel. An alternative embodiment provides for the element to remain stationary and the rotating grinding wheel moving in an arcuate path to produce the convex surface.

Abstract: A control system for a belt-drive infinitely variable transmission. The transmission is connected to a crankshaft of an engine through an electromagnetic clutch. The control system is provided with an engine speed signal producing circuit, a vehicle speed producing circuit and an arithmetic circuit for controlling the clutch current flowing through the coil of the clutch in dependency on the engine speed signal and vehicle speed signal. The arithmetic circuit is so arranged as to cut off the clutch current when the engine speed decreases to a predetermined value which is slightly higher than an engine speed at which the engine stalls during shiftdown operation of the transmission.

Abstract: A transmission, in particular for a motor vehicle, includes an infinitely variable V-belt transmission with a primary pulley having a primary shaft and a secondary pulley, each having two conical sheaves, a primary and a secondary hydraulic operating cylinder, respectively, for the axial displacement of at least one of the conical sheaves of each pulley, a hydraulic control valve for the control of the transmission ratio, the valve having a housing and an internal valve spool that can be displaced from an end position in which the valve spool rests against a stop and the valve housing having ports openable for the discharge of fluid from the primary operating cylinder and/or the supply of fluid to the secondary operating cylinder, to a center position where ports are substantially closed, so that virtually no supply of fluid to and discharge of fluid from at least one of the operating cylinders can take place, a hydrodynamic transmission unit having a rotary output member connected to said primary shaft and a

Abstract: A motor vehicle transmission includes an infinitely variable V-belt transmission having a primary (driving) pulley connected to an annular channel which is radially closed from the outside and into which a stationary pitot tube terminates for sensing the pressure of the fluid present in the channel in order to produce a fluid-pressure signal proportional to the speed of rotation of the primary pulley and further includes an input shaft which can be connected to the primary pulley through a fluid-pressure-operated driving away clutch. The input shaft of the transmission is connected to a second annular channel radially closed from the outside into which a second stationary pitot tube terminates for sensing the pressure of the fluid present in the second channel in order to produce a second fluid-pressure signal proportional to the speed of rotation of the input shaft.

Abstract: The invention relates to an infinitely variable transmission provided with an endless transmission member and at least one V-shaped pulley of which at least one sheave is rigidly connected to a hydraulic cylinder-piston unit for the axial displacement of this sheave. The said cylinder-piston unit being provided with a pressure-equalizing chamber for the compensation of pressure rises in the cylinder space due to centrifugal forces. The pressure-equalizing chamber can be supplied with fluid from the cylinder space through a charging port. In order to overcome the drawback of particles obstructing regularly the charging port, ahead of the charging port a filtering member is provided through which the fluid flow must pass.

Abstract: A transmission mechanism in particular for automobiles with a front wheel drive comprises a planetary forward-reverse gear set and a continuously variable pulley drive that is drivingly connected to a differential gearing. A forward friction disk clutch provided for obtaining a forward driving direction of the transmission mechanism may be selectively operated by a servo piston that is fixedly connected in an axially stationary manner to the adjusting piston of a hydraulic adjusting means provided for the selective adjustment of the movable sheave of a primary pulley of said pulley drive whereby the mutual arrangement is chosen in such a manner that the adjusting cylinder being fixedly connected to this movable sheave at least partly surrounds the servo piston. By this particular arrangement the axial dimension of the entire transmission mechanism may be reduced without the requirement of a separate starting clutch for the entire clutch assembly.

Abstract: A transmission, in particular for a motor vehicle, provided with an infinitely variable V-belt transmission having a primary and a secondary pulley over which the V-belt has been looped and provided with an input shaft, which is connected through a reversing gear to the primary pulley. The reversing gear being operated by means of a forward and a reverse command, respectively, in such a way as to transmit the same or the opposite direction of rotation. The primary pulley of said transmission is connected to an annular channel radially closed from the outside and into which a stationary pitot tube terminates for picking up a hydraulic signal depending on the speed of rotation, whereby the incorporation of means of control which prevent the reverse signal putting into operation the reversing gear, depending on the hydraulic signal.

Abstract: The invention relates to a transmission for vehicles, in particular for automobiles with front wheel drive, which have a driving motor mounted transverse to the longitudinal direction of the vehicle, whose drive shaft drives the primary shaft of an infinitely variable belt drive having a secondary shaft driven in the same direction of rotation by means of a drive belt and mounted coaxially with the drive pinion of a differential gear provided with output shafts. A reversing and reduction gearing, designed as a planetary gearset, is mounted coaxially with the secondary shaft of the belt drive and connected through its input member to the secondary shaft and through its output member to the drive pinion of the differential gearing, while its reactive section is fixed to the casing. As a result, a very compact transmission unit is achieved, having in forward drive position an output rotation in the same direction as the input rotation.

Abstract: In apparatus for controlling the transmission ratio of an infinitely variable V-belt transmission of the kind including a fluid control valve which supplies fluid to and relieves fluid from a cylinder space the volume of which controls the transmission ratio by adjusting the axial position of a first conical sheave portion relative to a second conical sheave portion, the valve including a valve housing and an internal axially displaceable valve body, the improvement which includes an electromagnet having a displaceable armature and a winding which upon electrical energization produces a displacing force on the armature; a spring connected between the armature and the axially displaceable valve body, the arrangement being such that a displacing force on the armature produced by energization of the electromagnet produces a displacing force, via the spring on the valve body in a first direction; and a fluid connection device controlled by the position of the armature for supplying fluid pressure to the valve bod

Abstract: Apparatus for controlling the transmission ratio of an infinitely variable motor vehicle transmission of the type including a belt and two pulleys each having conical discs which are hydraulically movable toward and away from each other, the apparatus including a hydraulic valve having an axially movable internal pilot slide for supplying and exhausting hydraulic fluid to the movable pulley discs to effect movement thereof, a first device responsive to actual engine speed for urging the slide in a first direction, a second device responsive to desired engine speed for applying an urging force on the slide in a second, opposite direction, and a third device for limiting the resulting urging force on the slide in the second direction, the third means being responsive to the transmission ratio.

Abstract: A V-belt comprising an endless flexible carrier provided with a plurality of substantially non-deformable transverse elements which are arranged slidably on the endless carrier and a plurality of intermediate elements disposed between the flanks of the endless carrier and the transverse elements so that the flanks do not contact the transverse elements, said intermediate elements extending longitudinally along more than one transverse element.