Abstract: A belt-type continuously variable transmission includes a primary sheave including a pair of first clamp surfaces, a secondary sheave including a pair of second clamp surfaces, and a belt endlessly wound between both of the primary and secondary sheaves. The belt includes contact surfaces clamped between the first clamp surfaces and between the second clamp surfaces. Powder having infusibility as a friction enhancing material is held on at least one of the first clamp surfaces of the primary sheave, the second clamp surfaces of the secondary sheave, and the contact surfaces of the belt.

Abstract: A continuously variable transmission (CVT) is provided for use on a recreational or utility vehicle. The CVT is electronically controlled by a control unit of the vehicle. The CVT includes a primary clutch having a first sheave and a second sheave moveable relative to the first sheave. An actuator may be positioned between the primary and secondary clutches.

Abstract: A speed control mechanism for controlling selective engagement of the self-propelled transmission assembly for a walk-behind lawn mower is provided. The speed control mechanism is also configured to control the relative output speed of the transmission assembly. The speed control mechanism includes a speed engagement assembly and a speed adjustment assembly, wherein the speed engagement assembly includes a pair of rotatable levers for causing the transmission assembly to actuate between a disengaged position and an engaged position and the speed adjustment assembly includes a rotatable knob for causing the relative output speed of the transmission assembly to the wheels of the lawn mower to increase or decrease.

Abstract: A method of manufacturing a pulley system includes spin-forming metal to form an annular wall of a sheave, pressing powdered metal to form a hub of the sheave, and fastening together the annular wall and the hub.

Abstract: A power transmission chain includes a plurality of links respectively having front and rear insertion parts into which pins are inserted, a plurality of first pins and a plurality of second pins which are arranged in front and back for connecting the links A plurality of the links includes two types of the links having different pitch lengths, wherein provided that a radius of a pulley shaft is RA, a radius of curvature of a face of the link having a shorter pitch length at an inner diameter side of the chain is RS, and a radius of curvature of a face of the link having a longer pitch length at an inner diameter side of the chain is RL, relation is set to be RA?RS?1.5 RA, and RS<RL.

Abstract: An IVT machine includes an input shaft, a drive wheel on the input shaft, an output shaft, a ratio changing device which is mounted on the output shaft, an endless belt which passes over the drive wheel and in an open loop on the ratio changing device, control elements for enlarging and reducing the belt loop dimension about the output shaft axis, belt guide elements providing a throat through which the belt enters and leaves its loop on the ratio changing device, and a drive arrangement on the ratio changing device for the transmission of drive power to the output shaft and is engaged with the belt in a portion of its loop on the device and engageable with the belt on both sides of the throat in its transition across the throat during rotation of the ratio changing device.

Abstract: With respect to a belt type continuously variable transmission in which a belt is wound around between a primary pulley and a secondary pulley, each of which includes a stationary sheave and a movable sheave, and a transmission is carried out by forwardly and backwardly moving the movable sheave with respect to the stationary sheave, a boss portion that protrudes in an axial direction is integrally formed with the stationary sheave of the secondary pulley, and a parking gear is provided on the outer circumferential side of the boss portion. Further, the configuration to hold the bearing is achieved using the inner circumferential portion of the boss portion integrally formed with the stationary sheave, that is, the inner circumferential portion of the parking gear so as to shorten the axial length of the secondary shaft, whereby achieving cost reduction.

Abstract: A power transmission device includes a tubular stabilizer which is arranged between a primary pulley and a secondary pulley, and through which a string portion of a power transmitting chain is passed so as to be movable relative to the stabilizer whereby movement of the power transmitting chain is restricted. The stabilizer is supported by the power transmitting chain and is moved in the traveling direction of the power transmitting chain as the power transmitting chain moves in the traveling direction, and a movement of the stabilizer of which the amount is larger than or equal to a predetermined amount is restricted by a restricting device.

Abstract: A belt type continuously variable transmission for a vehicle includes: an input shaft and an output shaft disposed in parallel with each other; a pair of groove width variable pulleys disposed on the outer circumferential sides of the input shaft and the output shaft; and a transmission belt wound around each of V-grooves of the pair of the groove width variable pulleys, the belt type continuously variable transmission for a vehicle changing a winding diameter of the transmission belt by changing the groove widths of the V-grooves so as to continuously vary a gear ratio, wherein the groove width variable pulley includes a fixed sheave fixed to an outer circumferential surface of one of the input shaft and the output shaft, and a movable sheave disposed relatively non-rotatably on the one shaft and relatively movably in the direction of the shaft center of the one shaft so as to form the V-groove with the fixed sheave, wherein the belt type continuously variable transmission for a vehicle is disposed with a pa

Abstract: An engine unit includes a crank shaft that receives a driving force of an engine and a moving pulley that is movable in an axial direction. Keyholes are formed on an outer peripheral surface of the crank shaft. Axially extending guide holes are formed on a boss portion of the moving pulley in positions that correspond to the keyholes. Ends of keys are mounted to the keyholes. The guide holes receive therein bases of the keys to guide relative movements of the moving pulley and the crank shaft in an axial direction.

Abstract: A power transmission device that includes an uppermost side bearing; a lower side bearing; an uppermost side lubricating medium storage portion defined between the uppermost side bearing and the case to guide a lubricating medium to the uppermost side bearing; a lower side lubricating medium storage portion defined between the lower side bearing and the case to guide a lubricating medium to the lower side bearing, and located below the uppermost side lubricating medium storage portion when installing the power transmission device for a vehicle on the vehicle; and a communicating passage formed in the case to communicate the uppermost side lubricating medium storage portion and the lower side lubricating medium storage portion with each other.

Abstract: A hybrid accessory drive system having two operational modes, a mechanical mode and an electric mode. The accessory is typically a cooling fan. A continuously variable mechanical belt drive mechanism drives the accessory as one mode of operation. An electric motor along with a planetary roller screw mechanism which converts rotary motion to axial motion is used to change the sheave position and thus the drive ratio. Upon disengagement of the mechanical drive mode, the electric motor can be used to drive the accessory in a second mode.

Abstract: Methods and devices for tailoring the functional relationship between the shift ratio of a CVT and the radial force (FR) into the cam surfaces of a CVT's helix. Such tailoring may effect downshifting, and the separation of the design of the upshift function from the design of the backshift function. Such tailoring may be effected by schemes that include the use of a helix with other than a constant distance from the rotational axis to the touch point (touch-point radius), a touch-point radius that is a monotonic function of the shift ratio, or a touch-point radius that is a meandering function of the shift ratio.

Abstract: A transmission controller for a continuously variable transmission system steadily returns a gear ratio toward the low-ratio range, even after a driving pulley has stopped during sudden deceleration. A control unit is provided which drives an actuator to move a driving-pulley movable half part to a position in the low-ratio range when a vehicle speed sensor detects the sudden deceleration of a body, a pulley number-of-revolution sensor detects stopping of the driving pulley, and then a gear ratio sensor detects that the gear ratio of the continuously variable transmission system has not returned to the low-ratio range where a sufficient acceleration is obtainable at the time of restart. Upon detecting a restart, the control unit presses the driving-pulley movable half part onto a V-belt to prevent sliding therebetween and thereby reduce a loss in the transmission of a driving force at the time of restart.

Abstract: A continuously variable transmission includes a first shaft integrally rotatably coupled to a primary pulley, a second shaft integrally rotatably coupled to the secondary pulley, a first gear mounted on the first shaft and relatively rotatable with respect to the first shaft, a second gear fixed on the second shaft and engaged with the first gear, a forward clutch for coupling an engine and the first shaft, and a reverse clutch for coupling the engine and the first gear.

Abstract: A clamp force control method for a continuous variable transmission may include a first process that fixes clamp force of any one of a driving pulley and a driven pulley, and a second process that finds a section where a transmission ratio may be the minimum while gradually decreasing the clamp force from a current clamp force of the other pulley of which the clamp force may not be fixed in the first process and sets the clamp force in the section where the transmission ratio may be the minimum as the clamp force of the other pulley, which may not be fixed.

Abstract: Pulley assembly for a continuously-variable vehicle transmission, comprising a support element having an axis, a first half-pulley rotationally connected to the support element, a second half-pulley facing the first half-pulley to define a seating adapted to house a drive belt, the second half-pulley being axially and circumferentially mobile in relation to the support element, and cam means functionally inserted between the second half-pulley and the support element to control the position of the second half-pulley. The cam means define a plurality of circumferential cavities carried by a peripheral portion of the second half-pulley, said cavities being defined by the first and second sides which are transverse to axis, and comprise a plurality of cam-followers which are connected to the support element and housed in the corresponding circumferential cavities to cooperate selectively with the first and second sides.

Abstract: A vehicle transmission with continuously variable transmission ratios, which has a first conical disk pair arranged on a first shaft, and a second conical disk pair arranged on a second shaft, a belt arranged between the conical disk pairs, and an input shaft which has an output wheel mounted rotatably thereon. The input shaft can optionally be rotationally engaged with the first or second shaft and the output wheel can be rotationally engaged with the respectively other shaft. Also, a multi-disk clutch transmits a rotational force between the input shaft and the first or second shaft and the output wheel can be rotationally engaged with the other shaft by way of a dog clutch. The first multi-disk clutch and the first dog clutch can be actuated by a first hydraulically actuated device and the second multi-disk clutch and the second dog clutch can be actuated by a second hydraulically actuated device.

Abstract: The invention relates to a disk set arrangement with a driving disk set and a driven disk set for a chain-type CVT, wherein each disk set of said arrangement comprises two disks that are axially displaceable relative to one another on a shaft and a chain arrangement comprising thrust pieces that are active between said disks. The longitudinal axis of said thrust pieces runs parallel to the rotational axis of the shaft, and the frictional surfaces of the disks and the thrust pieces have a curvature determined by a radius and an eccentricity, wherein the eccentricity of the disk in the driving disk set is different to that of the driven disk set.

Abstract: An engine having an engine case on one side of which a V-belt type of continuously variable transmission is provided, the CVT being placed in a transmission case and constituted that a V-belt is routed around a drive pulley and a driven pulley, the drive pulley being attached to one end of a crankshaft, the driven pulley being attached to one end of a transmission shaft parallel to the crankshaft, characterized in that the crankshaft is supported for free rotation with the engine case, one end of the crankshaft is projected in cantilever fashion from the engine case into the transmission case, the drive pulley is attached to the projected portion, and the transmission case is made as a component separate from or independent of the engine case and supported with the engine case so that a space is present between the engine case and the transmission case.

Abstract: In an automatic transmission with a speed changer having a plurality of engagement elements and configured to shift the speed changer into a selected one of a plurality of shift stages by switching engaged and disengaged states of the engagement elements, a first rotation sensor is provided for detecting input rotation of the speed changer and a second rotation sensor for detecting output rotation of the speed changer. Also provided is a transmission controller configured to determine whether a change in input torque inputted into the speed changer occurs. The transmission controller is further configured to determine that interlock has occurred in the speed changer, when there is no pulse signal output from the second rotation sensor though, during a vehicle stopped state, the input-torque change has occurred and the pulse signal from the first rotation sensor has been outputted.

Abstract: A belt-type continuously variable transmission (CVT) with reduced vibration at high engine speeds. A secondary sheave includes a fixed sheave member, a moving sheave member, a compression coil spring, and an outside spring guide. The compression coil spring urges the moving sheave member toward the fixed sheave member. The outside spring guide prevents the compression coil spring from buckling during compression.

Abstract: An electric-control belt-type continuous variable-speed transmission mechanism includes a driving-shaft, a driven-shaft, a driving-wheel, a driven-wheel, a transmission belt, a force-exerting device, an electric-control motor speed-adjusting device and an idle wheel. The electric-control motor speed-adjusting device operates along with the driving-wheel and the driven-wheel to dynamically control and adjust the overall configuration position of the transmission belt to thereby achieve effects of variable speeds, separation and restoration of dynamics. The idle wheel is rotatably disposed on the driving-shaft or the driven-shaft to axially support the transmission belt during the state of separate dynamics to prevent friction therebetween.

Abstract: A pulley for a belt transmission device of the type including at least one shaft and two flanges supported by the shaft, one of the flanges, recessed centrally and received so as to fit onto the shaft for an axially free installation being fitted with return elements to return in the direction of the other flange, and delimiting with the other flange a groove of variable dimension inside which it is possible for the belt to be inserted, at least one of the flanges being a flange made of synthetic material furnished, on its surface facing the other flange, with a centrally recessed dish made of metal. The or each dish is, in its zone adjacent to the central recess, separated from the flange that it lines by a space, called a peripheral space, which reduces in the zone the thermal exchanges between flange and dish.

Abstract: An electrical control belt continuously variable transmission system controls a movable driving half-pulley or movable driven half-pulley initiatively, by changing a driving interval between the movable driving half-pulley and a fixed driving half-pulley or a driven interval between the movable driven half-pulley and a fixed driven half-pulley, respectively, depending on different statuses, in order to adjust a velocity ratio. By manipulating the movable driving half-pulley or the movable driven half-pulley, the system may further form a driving gap between the movable driving half-pulley and a transmission belt or a driven gap between the movable driven half-pulley and the transmission belt, such that the power is cut off. Clamping the movable driving half-pulley or the movable driven half-pulley to the transmission belt may restore the outputting of the power.

Abstract: A continuously variable conical pulley transmission having pairs of conical pulleys which are rotationally fixedly arranged on drive input and drive output shafts and of which in each case one is fixed to the shaft and one is axially movable, and between which a traction mechanism belt for power transmission circulates. In order that it is not necessary to provide otherwise unutilized regions of the conical pulley surfaces to allow for corresponding wear, it is proposed that a stop for limiting the transmission ratio, which stop acts substantially in the radial direction on the traction mechanism belt, be provided in at least one conical pulley pair. It is intended in particular that the peripheral surface of the drive input shaft serves as a stop. It is also proposed that a chain as a traction mechanism belt be correspondingly matched to a device of said type by virtue of the contour of the links of said chain being matched to the contour of the drive input shaft.

Abstract: A pulley for a continuously variable transmission and a method of creating an engineered surface on an outer surface of a pulley of a continuously variable transmission, with the engineered surface engaging with a belt or chain of the continuously variable transmission. The method comprising the steps of: determining an actual engineered roughness (Rpk) on the outer surface needed to obtain a predetermined friction between the engineered surface and the belt or chain; and etching microgrooves in at least a portion of the outer surface to create the engineered surface by employing a laser to etch the microgrooves, the microgrooves being formed to a depth that produces the actual engineered roughness (Rpk).

Abstract: A fixed sheave mounted on an input shaft and a movable sheave mounted on a cylindrical member that is slidably supported in the axial direction relative to the input shaft are respectively structured using annular members having the same shape. With this structure, the fixed sheave and the movable sheave can be common structural components, thereby enabling the structural components to be easily formed by making the shape thereof relatively simple. As a result, productivity can be further improved.

Abstract: A simplified continuously variable transmission system control provides a variable clamping force and a differential cylinder pressure manipulation to change sheave ratios. The system control uses two pumps. The first pump provides the variable clamping force. The second pump provides pressure changes to effect ratio changes. The clamping force can be varied based upon operator demand on an associated engine.

Abstract: A belt type CVT, which has a variable drive pulley controlling a transmission gear ratio by varying a diameter and a variable driven pulley connected to the variable drive pulley by a belt and controlling a tension of the belt by varying a diameter in a manner opposite to that of the variable drive pulley, in which each of the variable drive and driven pulleys includes belt supports movably installed between a pair of pulley plates, and transmission plates mounted to outside surfaces of respective pulley plates and rotated in opposite directions, thereby moving the plurality of belt supports in the radial directions, and the inner surface of the belt is provided with ratchet gear parts engaged with the belt holding ratchet gear parts of the belt supports, so that the diameters of the variable drive pulley and the variable driven pulley can be more easily and efficiently varied.

Abstract: An automatic transmission in the form of a belt-driven conical-pulley transmission having conical disk sets on the power input and power output sides, and an endless torque-transmitting member interconnecting the input side and the output side disk sets for transmitting torque therebetween. At least one stop at at least one of the end positions of at least one axially displaceable disk is provided with a cushioned retarding component for minimizing disk impact loads.

Abstract: A power transmission apparatus for a vehicle is provided which is equipped with a power split device and a speed variator. The power transmission device is designed to set a speed ratio of speed of rotation of an output of a power source to speed of rotation of a driven wheel in a power circulation mode of a power split device to lie within one of a positive range in which a sign of the speed ratio is positive and a negative range in which a sign of the speed ratio is negative. This results in a decrease in degree of torque acting on the speed variator such as a continuously variable transmission, thus permitting a required degree of durability of the speed variator to be reduced.

Abstract: A continuously variable transmission in which a sliding member is prevented from inclining is provided. The continuously variable transmission has a first oil passage provided in a movable sheave, and a second oil passage provided in a primary shaft supporting the movable sheave and connected in series to the first oil passage. A working oil is discharged from a hydraulic chamber via the first and second oil passages. The working oil is more difficult to discharge from the second oil passage than the first oil passage.

Abstract: A sheave for use in a continuously variable transmission comprises a truncated, substantially conical portion having an inner radius, an outer radius and a contact surface extending between the inner radius and the outer radius. The contact surface of the sheave may include a plurality of concentric step features such that the contact surface is graduated between the inner radius and the outer radius. Each step feature may include a rise portion and a pitch portion. The rise portion of each step feature and the pitch portion of each step feature may extend in a circumferential direction on the contact surface.

Abstract: When a vehicle decelerates rapidly, a lower limit secondary pulley pressure (Plmt) is calculated on the basis of a primary pulley rotation speed (Npri) detected by a primary pulley rotation sensor. When a deceleration speed (Gdata) is greater than a predetermined deceleration speed (G1) and a secondary pulley pressure (Psec) detected by a secondary pulley pressure sensor is lower than the lower limit secondary pulley pressure (Plmt), it is determined that slippage is about to occur in a V-belt 4 on a primary pulley side in particular, and therefore speed ratio fixing control is performed.

Abstract: A continuously variable belt transmission for a vehicle which can generate a cancellation hydraulic pressure for cancellation with a simple construction, as well as urge a movable sheave in the direction for producing a belt pressing force even at the time a vehicle is towed. A member to form a first hydraulic chamber P1 where a pressing force acting on the movable sheave is generated and a circular member forming a part of a second hydraulic chamber P2 where a hydraulic pressure is generated to cancel a centrifugal hydraulic pressure generated in the first hydraulic chamber P1 are provided, wherein the circular member is formed of an elastic member urging the movable sheave in the direction for generating the belt pressing force at a position of the movable sheave in a predetermined gear ratio.

Abstract: In a metal ring for a metal belt of a belt type continuously variable transmission, a relationship is established between a compressive residual stress of a metal ring of an innermost layer imparted by a nitriding treatment and a free state radius of the metal ring nondimensionalized by a minimum winding radius. In the relationship, the sum of a compressive residual stress acting on the inner peripheral face of the metal ring, a compressive stress due to flexure and a contact stress does not exceed the elastic deformation limit of the metal ring. The maximum compressive stress of the metal ring does not become excessive, and an abrasion resistance of the surfaces of the metal ring is guaranteed.

Abstract: A disk set arrangement for a chain-CVT having a function-optimized disk set surface contour. The CVT includes a first drive disk set and a second driven disk set, wherein the disk sets of the disk set arrangement in each case include two disks mounted on respective shafts. One disk of each of the disk sets can be displaced axially relative to an opposed axially fixed disk. An endless chain arrangement with rocker pressure pieces is operative between the disk sets to transmit torque. The rocker pressure pieces have longitudinal axes that extend parallel to the rotational axes of the shafts, and include outer axial ends that contact the contoured disk surfaces.

Abstract: A method and apparatus for determining a motion transmission value that provides security of motion transmission between two components that transfer motion through frictional engagement. The motion transmission value provides security of motion transmission through the reaction of the motion transmitted to a change in the contact force between the components that are frictionally engaged. The contact force is modulated in a predetermined frequency range during the motion transmission, and the change in the motion transmitted during the modulation of the contact force is detected. The change in the motion transmitted is evaluated using a filtering process, and the motion transmission value is determined as the result of the evaluation.

Abstract: A pulley support structure for a belt-drive continuously variable transmission and a belt-drive continuously variable transmission are provided that are able to control the occurrence of Mindlin slip itself, and in cases where Mindlin slip has occurred, are able to effectively reduce the effects thereof. In this pulley support structure for a belt-drive continuously variable transmission, 2500 MPs or less is the maximum contact pressure during use between the raceway surfaces of the inner wheel and outer wheel and the rolling elements in the various roller bearings for rotatably supporting the pulleys for the continuously variable transmission. The rolling element surface hardness is HRc 60 or greater, and is at least 1 HRc harder than that of the raceway surfaces. The surface of the rolling element is nitrided or carbonitrided, and the nitrogen concentration in the surface is 0.2% by mass or greater and 2.0% by mass or less.

Abstract: A vehicle transmission with continuously variable transmission ratios, which has a first conical disk pair arranged on a first shaft, and a second conical disk pair arranged on a second shaft, a belt arranged between the conical disk pairs, and an input shaft which has an output wheel mounted rotatably thereon. The input shaft can optionally be rotationally engaged with the first or second shaft and the output wheel can be rotationally engaged with the respectively other shaft. Also, a multi-disk clutch transmits a rotational force between the input shaft and the first or second shaft and the output wheel can be rotationally engaged with the other shaft by way of a dog clutch. The first multi-disk clutch and the first dog clutch can be actuated by a first hydraulically actuated device and the second multi-disk clutch and the second dog clutch can be actuated by way of a second hydraulically actuated device.

Abstract: A snowmobile is disclosed having improved drive train including a continuously variable transmission (CVT) having a drive belt looped around a driving pulley and a driven pulley, and a transversely arranged jackshaft wherein the driven pulley is connected directly onto the outer surface of one end of the jackshaft. The transverse jackshaft is preferably made from a thin-walled hollow tube and the driven pulley is preferably press fitted thereon. A method of assembling a snowmobile drive train is also disclosed.

Abstract: Pulley alignment apparatus for aligning pulleys when the operating position of a variable sheave pulley of a pulley system has changed is provided. The pulley alignment apparatus has an adjustable laser light unit that can be adjusted to compensate for the resulting displacement of the centerline of the variable sheave pulley when the operating position is changed. The pulley alignment apparatus also has a set of gauges for determining the operating position of a variable sheave pulley and determining if a belt is adequate for the variable sheave pulley at the operating position.

Abstract: A power unit includes an engine having a crankshaft, and a continuously variable transmission having a drive pulley operatively connected with the crankshaft, a driven pulley, and a belt extended between and wrapped around the drive pulley and the driven pulley. The power unit further includes a transmission input clutch, which allows or interrupts the transmission of a rotational drive force of the crankshaft to the drive pulley, mounted on a drive pulley shaft; and a starter clutch, which allows or interrupts the transmission of a rotational drive force of the driven pulley to the drive wheel, mounted on a driven pulley shaft. The transmission input clutch and the starter clutch are arranged such that a continuously variable transmission is sandwiched therebetween.

Abstract: A transmission system for a vehicle with an electric motor includes a continuously variable transmission having a drive pulley, a driven pulley connected to one wheel of the vehicle, and a belt operatively connected between the drive pulley and the driven pulley such that a pitch radius of the belt in contact with each pulley is variable. The transmission system further includes a planetary gear set having a sun gear connected to the output of the motor, a ring gear connected to the drive pulley, and a planet gear operatively connected between the sun gear and the ring gear. The planet gear is rotatable about a respective planet gear axis which is fixed in position relative to the sun gear axis such that the planetary gear set is arranged to be operable at a fixed gear reduction.

Abstract: A continuously variable transmission (CVT) with a roller variator as an actuator for adjusting the speed ratio of the CVT. The CVT is of the variable-diameter pulley type and has first and second variable-diameter pulleys mechanically linked by a drive belt or other flexible drive member, the pulleys each having first and second relatively axially movable pulley portions. A roller variator is operatively connected to the first pulley, preferably the drive pulley, for control of its effective diameter. The roller variator has first and second disks mounted on the axis of the first pulley, a roller interconnecting the disks, and a roller support adapted to tilt the spin axis of the roller so as to change its points of contact with the disks and thereby change the speed ratio of the variator. The first disk is rotatably fixed with respect to the first pulley portion of the first pulley, for example, the pulley portion fixed to an engine shaft.

Abstract: An electronically controlled CVT driving pulley comprising a pair of opposed sheaves adapted to rotate about a driving pulley rotation axis is hereby provided, one of the sheaves including an axial protrusion including a series of teeth cooperating with an axial bearing mechanism providing a relative axial displacement between the opposed sheaves and to transmit a torque between the opposed sheaves. A kit and a method for transmitting a torque between two opposed sheaves of an electronically controlled CVT is also provided.

Abstract: A belt and conical pulley transmission including pairs of conical pulleys on the drive side and on the driven side, each pair of pulleys including an axially movable and an axially fixed conical pulley. A plate-link chain is disposed between the pulley pairs to transmit torque and includes pressure pieces. A slide rail guides the chain in a chain movement direction and is tiltably supported for tilting movement relative to a support. The slide rail is also movable along the support in a transverse direction relative to the chain movement direction to guide the chain during transmission ratio changes to minimize chain transverse oscillations and consequent acoustic disturbances.

Abstract: A process for producing a pulley for a belt drive CVT, including subjecting tapered surfaces of a preform of at least one of input and output pulleys to surface hardening, subjecting the surface-hardened tapered surfaces of the preform to hard turning to form microgrooves radially spaced from one another thereon, between which microprojections are formed, and reducing a height of the microprojections. Alternatively, a process for producing a pulley for a belt drive CVT, including subjecting tapered surfaces of a preform of at least one of input and output pulleys to surface hardening, subjecting the surface-hardened tapered surfaces of the preform to shot peening, and subjecting the shot-peened tapered surfaces of the preform to finishing to form microgrooves having a substantially equal pitch thereon.

Abstract: To obtain a compact structure and to increase at the same time the structural stiffness of an apparatus for plastically deforming and strengthening the links, which are intercoupled by rocker pins, of a complete endless transmission chain, said apparatus comprises a first and a second pair respectively of conical supporting surfaces for the ends which protrude outside said links of the rocker pins of a transmission chain, mounted thereon, said surfaces having a controllable mutual distance, the invention propose to add a third similar pair of supporting surfaces, provided for cooperation with the first and second shaft. This measure also speeds up the treatment of the transmission chain.