Abstract: A pulley, in particular for a continuously variable transmission, provided with two sheaves placed on a pulley shaft, at least one sheave being movable in the axial direction relative to the pulley shaft by movement structure. This movement structure includes at least one piston/cylinder assembly, and also fixing structure which fixes the movable sheave in the direction of rotation relative to the pulley shaft. According to the invention, the fixing structure is fitted at least inside a cylinder of the piston/cylinder assembly.

Abstract: A continuously variable transmission, in particular for a motor vehicle, provided with a control for the transmission ratio of the transmission, which control in a first operating mode controls the transmission ratio on the basis of one or more input signals and in a second operating mode controls the transmission ratio, for example on the basis of an external signal originating from the driver of the motor vehicle, along one or more control curves of one or more sets of control curves, possibly within rotational speed limits imposed on the input speed of the transmission. One or more control curves and/or one or more rotational speed limits are a function of the input speed of the transmission in such a way that, in accordance with those functions, the input speed of the transmission is not zero for a notional output speed of the transmission of zero. In this way the drive characteristics of the transmission are appreciably improved, coupled with improved efficiency and optimum power.

Abstract: A method for controlling the transmission ratio (input speed/output speed) of a continuously variable transmission, in particular for a motor vehicle. The transmission can be set to a second operational state as a result of energization by an activation signal. In the second operational state, the transmission ratio increases or decreases in the event of a decrease of increase, respectively, in the output speed of the transmission. In the second operational state, the transmission ratio is controlled using a control line, which intersects a point determined by the instantaneous input speed and instantaneous output speed of the transmission at the instant of commencement of said second operational state and also intersects a starting point determined by an input speed equal to zero and an output speed notionally less than zero. The invention also relates to an apparatus for carrying out the method.

Abstract: The invention relates to a method for influencing the tension in a drive belt in a continuously variable transmission. According to the invention, the tensions in the drive belt are determined as a function of the speed of the drive belt. For part, parts or the entire range of the possible input speeds of the transmission, the input speed of the transmission is then increased and/or reduced to a desired speed range for the drive belt with an essentially relatively lower tension in the drive belt. The power density, the efficiency and the control range of the transmission can be improved by application of this method.

Abstract: Pulley, in particular for a continuously variable transmission. The pulley is provided with two discs on a pulley shaft, at least one disc being axially movable relative to the other disc by means of control means. The movable disc is connected to the pulley shaft by means of a key/groove connection. A radially inward profile of the key/groove connection is connected to the disc, and a radially outward profile of the key/groove connection is connected to the shaft.

Abstract: A transmission with a fixed transmission ratio comprises a pliable endless member which is provided with a profile of mainly transversely oriented teeth, and at least two pulleys which are each provided, on their circumferential surface, with recesses which mate with the teeth. The pliable member is a flexible belt which is stiff in its longitudinal direction and which may be made of metal, for example.

Abstract: A continuously variable transmission comprises a sun wheel (11, 66) and at least one planet wheel (3, 65) having a double, essentially conical surface (30, 31, 64, 71, 72), which planet wheel (3, 65) interacts on one side with the sun wheel (11, 66) and on the other side with an annulus wheel (2, 73), as well as adjusting structure (5, 6, 16) for changing the transmission ratio. Each planet wheel (3, 65) is provided with an intermediate wheel (9, 59) which interacts on one side with the sun wheel (11, 66) and on the other side with the planet wheel (3, 65). Each planet wheel (3, 65) and, where appropriate, intermediate wheel (9, 59) is also adjustable about an imaginary axis which runs transversely to the centre line of the sun wheel (11, 66), such that each planet wheel (3, 65) can be brought into positions with respect to the annulus wheel (2, 59) in which they can roll with respect to one another so as to describe a helical path.

Abstract: To obtain a flexible transmission system which can be adjusted to the meet the individual desires of a driver, the choice of the desired value of the rate of revolution of the primary axle in the system, based on the current position of an accelerator pedal, and based on the current rate of revolution of the secondary axle of the system, is influenced, whereby several sub ranges are composed from the range of possible desired rate of revolution values of the primary axle, so that the possible positional values of the accelerator pedal can be combined with one of the sub ranges, to choice. A sub range preferably serves as a model for a desired type of driving program. If desired, the boundary values of the sub range can be continuously adjusted through the use of potentiometers which are operated by the driver. To assist in the realization of a simple-to-implement digital construction, the sub range values are stored in a memory.

Abstract: The invention relates to a drive belt, in particular suitable for a continuously variable transmission, the configuration of the drive belt being such that the tilting of the transverse elements of the drive belt in the pulley of the continuously variable transmission is largely overcome. The drive belt can be produced in a relatively simple and cheap way, offers a higher efficiency and less wear.

Abstract: Pulley for a continuously variable transmission provided with a set of discs on a pulley shaft. At least one of the set of discs is axially movable, and at least one axially fixed bearing is interposed between the pulley and a transmission housing. One or more of the bearings are mounted on a disc of the pulley.

Abstract: A device for optically providing information pertaining to the value of the quotient of the rates of revolution of two axles contains converters connected to the axles, which converters generate electrical signals which are a measure for the rate of revolution of the respective axles. At least one of the signals is fed to a ladder network of resistances which contains tap-off points which are connected to similar inputs of comparator circuits. The other inputs of the various amplifiers receive as input the signal which is a measure for the rate of revolution of the other axle. The comparator circuits are each coupled to light-emitting elements of which a few, depending upon the quotient of the revolution rates, illuminate. When applied in a vehicle which is provided with a continuously variable transmission, optical information pertaining to the current value of the transmission ratio is thus provided.

Abstract: The invention relates to a drive belt, in particular suitable for a continuously variable transmission, the configuration of the drive belt being such that the tilting of the transverse elements of the drive belt in the pulley of the continuously variable transmission is largely overcome. The drive belt can be produced in a relatively simple and cheap way, offers a higher efficiency and less wear.

Abstract: An electronically controlled continuously variable transmission system is provided with a driving belt trained over a primary and secondary pulley. The primary pulley is provided on a primary shaft and the secondary pulley is provided on a secondary shaft. Each pulley has corresponding spaced, conical pulley halves and at least one of the corresponding pulley halves is axially movable by respective primary and secondary moving devices. The transmission further includes a primary electronic control system for controlling the transmission ratio and a secondary electronic control system for controlling the belt tension. The primary electronic control system permits the operator to select from fuel economy, sporting, and maximum comfort performance modes. The primary electronic control means controls the transmission ratio in accordance with the performance mode selected. The moving devices include standby operating valves to permit continued operation of the transmission in case of power failure.

Abstract: A transverse element for an endless transmission unit, which transmission unit comprises one or more carriers having transverse elements slidably disposed thereon, the transverse element being provided with coupling elements and also a tilting zone on at least one of the two main sides of the transverse element. According to the invention, the coupling elements and the tilting zone are integrated in a universal joint.

Abstract: In a continuously variable transmission which is provided with a primary pulley and a secondary pulley, between which a driving belt is mounted, primary and secondary control systems, which are coupled to the respective pressure chambers of the axially translatable pulley discs, are employed to precipitate current pressure values, in dependence upon desired pressure values. To this end, the control system employs a regulator to which only the difference between the desired and the measured pressure-value is supplied, whereby the regulator nevertheless only has to regulate the relatively rapidly changing variation in a rest value supplied separately by a rest state device. This greatly improves the dynamic behaviour of the controller, so that rapid variations in the desired value of the entrant pressure can be effectively followed by the control system.

Abstract: Transverse element for a drive belt of the kind in which transverse elements whose principal planes rest against each other are fitted displaceably on one or more supports. The transverse elements are provided with one or more supporting surfaces for the support(s), the supporting surface being profiled at least in the direction transverse to the principal planes of the transverse element. The supporting surface is profiled in such a manner that a resultant force, which is to be exerted by a support on the transverse element, essentially engages outside the center of the supporting surface delimited by the principal planes. Stable positioning of the transverse element in the pulleys is thereby obtained, slipping and wear are reduced and efficiency increased. Specifically, the crest of the supporting surface is laterally offset.

Abstract: An electronically controlled continuously variable transmission system is provided with a driving belt trained over a primary and secondary pulley. The primary pulley is provided on a primary shaft and the secondary pulley is provided on a secondary shaft. Each pulley has corresponding spaced, conical pulley halves and at least one of the corresponding pulley halves is axially movable by respective primary and secondary moving devices. The transmission further includes a primary electronic control system for controlling the transmission ratio and a secondary electronic control system for controlling the belt tension. The primary electronic control system permits the operator to select from fuel economy, sporting, and maximum comfort performance modes. The primary electronic control means controls the transmission ratio in accordance with the performance mode selected. The moving devices include standby operating valves to permit continued operation of the transmission in case of power failure.

Abstract: Pulley, in particular suitable for application in a continuously variable transmission, in which an endless belt can be fitted between the discs of the pulleys, the path of which endless belt can be influenced by a cylinder/piston device. The cylinder/piston device is provided with at least one pressure chamber provided with walls, one of the walls being provided with a resilient hinge, as a result of which elastic expansion of the wall around the hinge is achieved at relatively high pressures in the pressure chamber. Therefore, the shaft, along which at least one of the discs is axially displaceable, is not clamped and deformed to a lesser extent under heavy load, so that the action of the transmission is not impeded.

Abstract: The invention relates to a rotary pump for use in particular in a continuously variable transmission. The rotary pump comprises a drive shaft with a rotor, in radial grooves of which movable displacement elements are disposed and slide along the radial inner side of a surrounding cam ring, forming variable pump chambers. The rotor is bounded at both long sides by end faces, an end plate being provided with some play between at least one end face and the rotor. One or more seals are provided between the end face and the end plate, to seal the supply and/or discharge apertures of the pump in order to prevent leakages between the end plate and the end face.

Abstract: A rotary pump is provided with a pump housing, a rotor situated in the pump housing and rotatable by means of a drive shaft, and also blade elements which are accommodated so that they can slide in grooves on the periphery of the rotor, and which interact in a sealing manner with a fixed cam surface. The pump housing is composed of three pump housing parts tightly connected to each other, the central pump housing part containing the cam surface. In order to simplify the housing, a port plate is provided with supply ports and discharge ports and accommodated in the central pump housing part. Preferably, the blade elements rest with one of their sides faces against an end face which is formed by the inward-facing surface of an outer pump housing part.