Abstract: The invention relates to a device for controlling the contact pressure of a transmission element of a continuously variable transmission, especially the traction element of a flexible drive for motor vehicles. The inventive device is provided with at least two levers as the transmission elements that provide the contact pressure depending on torque and ratio. Said levers are pivoted to the driving transmission elements and to the driven transmission elements and act upon an axially displaceable transmission element that indirectly or directly exerts the contact pressure via at least one rolling element each. The lever length effective to exert the contact pressure can be varied in accordance with the selected transmission ratio.

Abstract: A continuously variable transmission comprises a housing (1) which accommodates two pulley sets (2, 3) and an endless flexible drive element (24) fitted around said pulley sets for transferring a torque, one of said pulley sets being provided with coupling means (14) for an ingoing shaft and the other with coupling means (22) for an outgoing shaft, said pulley sets each comprising two discs (4, 5) enclosing a groove which increases in radially outward direction, and screw drive means (6) for changing the distance between the two discs of each pulley set with the aim of changing the transmission ratio. Each disc is connected to a hub unit (7, 8) comprising a rolling element bearing means (9, 10, 30) for rotatably supporting the disc, each hub unit being axially displaceably supported with respect to the housing.

Abstract: A belt clamping pressure setting device includes: a belt clamping pressure setting unit that sets a belt clamping pressure of a continuously variable transmission that includes an input-side pulley, an output-side pulley, and a belt running between the input-side pulley and the out-side pulley; an input revolution detection sensor that detects a number of input revolutions of the input-side pulley; an output revolution detection sensor that detects a number of output revolutions of the output-side pulley; an input torque detection unit that detects an input torque to the input-side pulley; a reference clamping pressure computing unit that computes a reference clamping pressure, based on the number of input revolutions detected by the input revolution detection sensor, the number of output revolutions detected by the output revolution detection sensor, and the input torque detected by the input torque detection unit; and a belt clamping pressure computing unit that computes the belt clamping pressure to be set

Abstract: The invention relates to a control circuit for generating a control signal (I) for controlling the transmission ratio adjustment of a belt transmission continuously adjustable with respect to its transmission ratio. The belt transmission includes a drive end (7), an output end (8) and a primary valve (15) for adjusting the transmission ratio. The primary valve (15) is driven by the control signal (I). The control circuit includes means for generating the control signal (I) in dependence upon operating parameters of the vehicle transmitted to the control circuit. It is suggested that the control signal (I) is generated in dependence upon a value (y) for a desired speed of the transmission ratio change or from a quantity derived therefrom. The value (y) for the desired speed of the transmission ratio change is determined from the operating parameters transmitted to the control circuit.

Abstract: A ball screw mechanism that can drive a movable pulley disk in an axial direction includes a screw cylinder and a nut member. A stopper pin is inserted through the screw cylinder from one end surface of the circumferential wall of the screw cylinder to the other end surface. As an end portion of the stopper pin is engaged with a notch portion of a transmission case, the rotation of the screw cylinder is inhibited. A stopper projection is provided on the nut member. As the other end portion of the stopper pin abuts against the stopper projection, the rotation range of the nut member is regulated. The stopper projection and the stopper pin function as excessive fastening preventing means for preventing the excessive fastening of the ball screw mechanism.

Abstract: Cooling efficiency of cooling air is enhanced and durability of a continuously variable transmission is improved. The continuously variable transmission to be mounted on a vehicle has a transmission case. A primary pulley driven by an engine and a primary pulley linked to drive wheels are rotatably accommodated in the transmission case. A V-belt is provided to extend for winging between the primary pulley and the secondary pulley, and the rotation of the primary pulley is continuously changed and transmitted to the secondary pulley. Fan blades are formed in the primary pulley, and a scroll surface is formed in transmission case from an intake region of the cooling air toward a discharge region thereof so as to gradually away from top faces of the fan blades in a radial-outer direction. Thereby, blowing efficiency of the cooling air can be enhanced and an interior of the transmission case can be sufficiently cooled, whereby the durability of the V-belt can be enhanced.

Abstract: A hydraulic transmission (21) has an electric actuator (86) for changing its output/input rotation speed ratio. A controller (19) of the actuator memorizes a command current value to the actuator supposing that load is not applied on the hydraulic transmission, and calculates a value of load applied on the hydraulic transmission by calculating a difference between an actual command current value to the actuator and the memorized command current value. A command current value is compensated based on the value of load, and the actuator receives feedback to be controlled. A vehicle may have a differential mechanism (10), which combines rotation powers on input side and output side of the hydraulic transmission. A detector (82) detects rotation speed of a main speed change output shaft (27) serving as an output shaft of the differential mechanism.

Abstract: In an actuator device which comprises a screw shaft, a nut member, and balls, the nut member moves relatively to the screw shaft in a first axial direction and a second axial direction opposite thereto in a manner such that it is continually subjected to a load in the first axial direction. A ball screw groove of the screw shaft is formed having a loaded surface which is pressed against the balls, on the side of a groove base in the first axial direction. A ball screw groove of the nut member is having a loaded surface which is pressed against the balls, on the side of its groove base in the second axial direction. These loaded surfaces are finished so that their surface roughness is lower than that of the unloaded surfaces.

Abstract: A power transmission comprises a belt type continuously variable ratio-change mechanism CVT and a fixed ratio rotational transmission mechanism GT, which transmit the rotational driving force of a primary shaft 1 rotationally driven by an engine to a countershaft 3 with a speed ratio change. The continuously variable ratio-change mechanism comprises a drive pulley 10, a driven pulley 15 and a metal belt 14 while the fixed ratio rotational transmission mechanism GT comprises a forward drive gear train, a forward output transmission gear train, and a reverse drive gear train. The forward drive gear train transmits the rotation of an input drive gear 31 on the primary shaft 1 through an idler gear 32 to a LOW driven gear 33 on a secondary shaft 2, and the forward output transmission gear train transmits the rotation of the secondary shaft 2 to the countershaft 3.

Abstract: The chain according to the invention comprises a plurality of linking members arranged one behind the other so as to form a closed loop, each linking member comprising two end links intended to come into contact with truncated surfaces of the continuously variable transmission, as well as intermediate links, while pivot pins are provided, allowing the mutual pivoting of two adjacent linking members, which extend through the openings made at least in these intermediate links.

Abstract: A driven unit for a continuously-variable-ratio drive, having a fixed half-pulley assembly having a fixed half-pulley connected to an output member of the drive; a movable half-pulley assembly having a movable half-pulley mounted to slide axially with respect to the fixed half-pulley to form with it a V-shaped groove of variable width for a V-shaped belt; and a spring which forces the half-pulleys towards each other to keep the half-pulleys in contact with the belt; the fixed half-pulley assembly has one or more threaded through axial holes in which to screw respective screws, which cooperate with an annular surface axially facing the holes in the fixed half-pulley assembly to exert thrust on the surface and part the half-pulleys in opposition to the spring.

Abstract: Since a pressing force applied to a pulley has ability to regulate a rotation speed and an elastic force applied to the pulley has ability to regulate torque, by independently applying the pressing force and/or the elastic force to the single pulley, and externally regulating the pressing force and/or elastic force to arbitrary values independently, a practical speed-change range is widened irrespective of a type of belt and high effective transmission is achieved. The pulley pressure control system comprises pressure application means for applying at least one of a pressing force and an elastic force to each movable disk, in which the pressing force applied to the movable disk regulates a rotation speed of each pulley by shifting a position of the endless belt on the pulley and the elastic force applied to the movable disk regulates torque using a frictional force.

Abstract: In a slippage prevention apparatus of a belt-drive continuously variable transmission for an automotive vehicle in which a transmission ratio is controlled by a speed-change hydraulic pressure brought closer to a desired speed-change hydraulic pressure, a quick-acceleration-frequency decision section is provided to determine whether a frequency of quick accelerating operations is low or high. Also provided is a desired hydraulic pressure decision section that sets the desired speed-change hydraulic pressure used during an operating mode that the frequency of quick accelerating operations is low to a relatively lower pressure level than the desired speed-change hydraulic pressure used during an operating mode that the frequency of quick accelerating operations is high.

Abstract: A gear reducer having a hollow shaft is telescopically mounted on the upper end of a vertical conveyor drive shaft. The gear reducer is removed for repair by raising the gear reducer housing to separate the hollow shaft from the drive shaft while the drive shaft remains on the drive frame.

Abstract: The invention relates to a device for converting a rotational movement into an axial movement, comprising driven planetary rollers (10) and a sliding body (5) that can be axially displaced by means of the planetary rollers (10). The planetary rollers (10) are fixed axially in a driven carrier (9), are rotationally mounted and are provided with grooves (11). The grooves (11) of said planetary rollers (10) engage in a thread-type groove of the sliding body (5). In the centre of the carrier (9), a bearing body (7), which engages in the grooves (11), is provided. The aim of the invention is to construct said device in a simple manner and at the same time configure it to be devoid of slip.

Abstract: The rigidity of a movable pulley half is enhanced by the rigidity of a cylinder fixed to a back surface of the movable pulley half and influences of a controlled hydraulic pressure and a centrifugal hydraulic pressure which are exerted in a hydraulic fluid chamber partitioned in the cylinder. On the other hand, an annular protruding portion having detection teeth for a rotation sensor is formed on a back surface of an outer circumferential portion of a fixed pulley half, whereby the difference in rigidity between both the pulley halves is reduced by the effect of the annular protruding portion to improve the rigidity of the fixed pulley half, thereby making it possible to allow the variation characteristics of a misalignment relative to a drive ration to approach a characteristic set in advance.

Abstract: A transmission system includes a shaft and a first disk is fixedly mounted to the shaft and a second disk is movably mounted to the shaft. Each of the first disk and the second disk includes an inclined surface which face with each other. The second disk has a third inclined surface located in opposite to the second inclined surface. A cap is fixedly mounted to the shaft and a plurality of pushing members are pivotably connected to the cap. The pushing members each have a distal end so as to push the third inclined surface of the second disk toward the first disk when the shaft is rotated. A belt reeves around the shaft and is movably clamped between the first inclined surface and the second inclined surface.

Abstract: The invention relates to an arrangement and a method for determining the transmission ratio of a continuously variable transmission having a drive end and an output end. A signal, which represents the transmission ratio, is computed in dependence upon a primary rpm of the drive end and a secondary rpm of the output end which are transmitted to the arrangement. A fault signal is generated which is dependent upon the instantaneous primary rpm and/or the instantaneous secondary rpm and indicates whether a value for the transmission ratio is to be outputted as the signal representing the transmission ratio. This value is computed from the detected instantaneous values for the primary rpm and the secondary rpm.

Abstract: A continuously variable reversible transmission including an input shaft (2), a housing (1), an input arm (4), first and second CVT shafts (5.6), a fixed input wheel (35), a ratio selector mechanism, an overall output wheel (36) and an output shaft (24). The input arm (4) is fixed to the input shaft (2) and extends substantially perpendicular to the input shaft. At each end of the input arm, a first (5) and second (6) CVT shaft is rotatably mounted, with the axes of the CVT shafts extending parallel to the input shaft. The fixed input wheel (35) may be aligned with the axis of the input shaft. The first CVT shaft (5) is coupled with the fixed input wheel (35), the second CVT shaft (6) is coupled with the first CVT shaft (5) and the output wheel (36) which is fixed to the output shaft (24) is coupled with the second CVT shaft.

Abstract: A transmission equipped with a continuously variable ratio-change mechanism CVT and a LOW rotational transmission mechanism GT, which are disposed parallel with each other, comprises a forward clutch 65 and a reverse brake 66, which are used to set a power transmission through the continuously variable ratio-change mechanism, a LOW clutch 46, which is used to set a power transmission through the LOW rotational transmission mechanism, and a control unit ECU and a hydraulic control valve HV, which control the engagement of the clutches and the brake. When the transmission is switched from its neutral mode to its in-gear mode, at first, the forward clutch 65 is brought gradually into engagement, and then it is released before the LOW clutch 46 is brought into engagement in a squat control.

Abstract: A variable speed transmission including a housing, a drive shaft having an axis of rotation and rotatably supported in the housing, an output shaft having an axis of rotation and rotatably supported in the housing, a first pulley and a second pulley both having a common axis of rotation, a third pulley having an axis of rotation and rotatably attached to the drive shaft, and a belt. The output shaft is operatively connected to the drive shaft. The first pulley and the second pulley each have a variable pitch diameter and changes in the first and second pulley variable pitch diameters being inversely proportional. The third pulley and one of the first and the second pulleys are in engagement though the belt.

Abstract: A power transmission device for utility machinery is disclosed, the device including:

Abstract: A continuously variable transmission (CVT) assembly includes first and second pulley pairs having a drive belt extended therebetween. A transmission case cover includes a threaded aperture. A threaded sleeve and bearing assembly is positioned on a stationary pulley member and threadedly engaged with the threaded aperture. The threaded sleeve and bearing assembly is engaged with the stationary pulley member such that rotation of the threaded sleeve and bearing assembly causes axial adjustment of the stationary pulley member. A lock feature locks the threaded sleeve and bearing assembly in the desired rotational position, thereby locking the stationary pulley member in an axially adjusted position.

Abstract: The invention describes a method and a device for controlling a drive train of a motor vehicle with a drive assembly and a continuously variable automatic transmission with a variable speed gear, wherein an electronic control unit for controlling at least the continuously variable automatic transmission and an emergency device are provided, with this unit being activated in the event of failure of the electronic control unit and a constant pressure/force ratio being established in the variable speed gear. Pursuant to the invention, in the event of failure of the electronic control unit the frictional connection between the drive assembly and the continuously variable automatic transmission is interrupted before the emergency driving mode is made available through the emergency device by re-establishing the frictional connection.

Abstract: A V-belt type of automatic transmitting mechanism. The mechanism includes a drive pulley and a V-belt, and the drive pulley includes a fixed sheave which is fixed to a drive shaft and a movable sheave which is movable in a direction of the drive shaft. When the drive shaft rotates at a higher speed, the movable sheave is moved towards the fixed sheave so that the radius of engagement between each of the sheaves and the V-belt increases. The conical pressure surface of the movable sheave is formed so that an inclined angle thereof is uniform from its radially inner peripheral part to its radially outer peripheral part. Meanwhile, the conical pressure surface of the fixed sheave is formed so that an inclined angle of its radially inner peripheral part is smaller than that of its radially outer peripheral part.

Abstract: A belt type continuously variable transmission includes a drive pulley having a fixed pulley half and a movable pulley half; a driven pulley having a fixed pulley half and a movable pulley half; and a metal belt. The metal belt includes a metal ring assembly having a plurality of endless metal rings laminated on one another and a plurality of metal elements supported on the metal ring assembly. The metal belt is wound around the drive pulley and the driven pulley. The movable pulley half of the drive pulley has a flexural stiffness higher than that of the fixed pulley half of the drive pulley, wherein it is difficult for the edges of the metal ring assembly to contact the metal elements and a V-face of the drive pulley.

Abstract: A rotary woodworking machine includes a longitudinally extending transmitting shaft having two ends respectively coupled to two rotary woodworking members. A speed ratio varying device is disposed to couple the transmitting shaft to an output shaft of a motor, and includes two pitch-variable first and second pulleys mounted on the transmitting shaft and the output shaft, a belt trained on the pulleys, and a control unit operable to move a movable disc of the first pulley toward or away from a fixed disc of the first pulley so as to vary the radial distances between the belt and each of the shafts, thereby varying the speed ratio of the transmitting shaft to the output shaft.

Abstract: A pulley system for use in a constant variable transmission includes a pair of pulley sheaves or flanges mechanically linked by a belt so that the outer surfaces of the belt interact with the inner surfaces of the flanges. At least one of the pulley flanges has an inclined inner surface disposed at an angle that changes progressively based on a curve have a variable radius. For example, the sheave angle can change progressively from 9 degrees to 12 degrees or from 12 degrees to 14 degrees, with no sharp or stepped edges. The belt can have a complementary angled surface also. The progressively variable angle allows the flange surface to more closely match the side surface of the belt, which can increase the belt life be reducing stress experienced by the belt. The pulley system is useable in a transmission for a vehicle, for example a snowmobile or an all terrain vehicle.

Abstract: An adjustable pulley for use in a continuously variable transmission has two coaxial flanges at least one of which is a composite flange having an annular main section with a conical surface adjacent a reinforcing liner of wear resistant material. The liner is secured to the main section of the composite flange by a one-piece or composite disc-shaped insert one side of which has several portions affixed (such as bonded and/or riveted) to the adjacent side of the liner, and the other side of which has several portions affixed to the conical surface and/or another part of the main section. Those portions of the one side of the insert which are affixed to the liner are out of register with those portions of the other side of the insert which are affixed to the main section to thus enable the liner to move relative to the conical surface in one or more directions other than circumferentially of the main section.

Abstract: An apparatus for varying the rate of seed population by planters or drills, comprising first and second squeeze jack variable speed pulleys, and a belt running around the pulleys; a cog mounted on the first pulley and a cog mounted on the second pulley, and a drive chain running around the cog mounted on the first pulley and a row unit chain running around the cog mounted on the second pulley; and apparatus to vary selectively the speed of the row unit chain at any given speed of the drive chain and at any slope of the apparatus above or below level ground.

Abstract: A variable speed transmission includes an actuator mechanism that can be remotely activated to cause engagement of a drive unit and to subsequently vary the speed of the drive unit using the same activation mechanism. The variable speed transmission can include a first pulley that has a first and second face that are movable relative to each other by activation of the actuator mechanism. When the first and second faces of the first pulley are located in a first position, a belt located on the first pulley remains motionless. The first and second faces can be moved by the actuator mechanism into a second position where the first and second plates engage the belt with enough frictional force to cause the belt to start moving about the first pulley. The first and second faces of the first pulley can also be moved between the second position and a third position such that the space between the faces becomes smaller.

Abstract: An improvement relating to an infinitely variable ratio transmission having a pair of oppositely oriented variable diameter torque input and output pulleys is disclosed wherein the conical surfaces of the pulleys include a multiplicity of axially and circumferentially movable sprocket bars to accommodate the fixed length of an inextensible drive belt or chain wrapping about the pulleys.

Abstract: An endless metallic belt has at its outer peripheral surface a layer provided with a compressive residual stress by shot peening, and also has at its inner peripheral surface a layer provided with a compressive residual stress by shot peening. In a method for manufacturing the endless metallic belt, both outer and inner peripheral surfaces of the endless metallic belt are subjected to shot peening, wherein the inner peripheral surface is shot peened prior to the outer peripheral surface. The method produces an endless metallic belt having its fatigue strength improved without suffering any significant deformation.

Abstract: A continuously variable transmission, provided with two adjustable pulleys, each pulley comprising a pair of mutually displaceable essentially frusto-conical pulley sheaves having a radial dimension provided on a pulley shaft, each sheave having a sheave face, whereby the sheave faces of a pulley are mutually oriented at a pulley angle, and with an endless flexible belt for transmitting torque comprising two lateral side faces, which are mutually oriented at a belt angle ( alpha ) such that the flexible belt tapers radially inwardly and which are intended for interacting with the sheave faces of a pulley under the influence of a clamping force to be exerted on the flexible belt by the sheaves. The belt angle is marginally, but notionally, larger than the pulley angle (beta) of at least one pulley for at least a substantial part of the radial dimension of the pulley sheaves.

Abstract: A variable speed transmission includes an actuator mechanism that can be remotely activated to cause engagement of a drive unit and to subsequently vary the speed of the drive unit using the same activation mechanism. The variable speed transmission can include a first pulley that has a first and second face that are movable relative to each other by activation of the actuator mechanism. When the first and second faces of the first pulley are located in a first position, a belt located on the first pulley remains motionless. The first and second faces can be moved by the actuator mechanism into a second position where the first and second plates engage the belt with enough frictional force to cause the belt to start moving about the first pulley. The first and second faces of the first pulley can also be moved between the second position and a third position such that the space between the faces becomes smaller.

Abstract: A continuously variable transmission for a motor vehicle. The transmission includes an adjustable width drive pulley and an adjustable width output pulley that are drivingly connected by an endless torque-transmitting member. The drive pulley includes a spring to bias the movable element of the pulley toward a position at which the spacing between the conical disks that define the pulley are at a minimum, to avoid damage to the transmission when the vehicle is being towed.

Abstract: An infinitely variable transmission has a pair of driving conical flanges arranged on a first shaft and a pair of driven conical flanges arranged on a second shaft. Each pair has one axially movable conical flange and one axially fixed conical flange. The transmission is equipped with a locking device which when necessary can frictionally lock at least one driving conical flange to a driven conical flange.

Abstract: A belt type transmission improves the durability of a support portion of a driven shaft by reducing a load acting on a driven shaft, and improves the durability of the belt and reduces noise by suppressing vibration of a driven pulley. The belt type transmission includes a driven pulley having a fixed pulley piece and a movable pulley piece fitted to a driven shaft. The fixed pulley piece is rotatably supported, respectively, on the driven shaft and a bearing holder, being a constructional element of a transmission case. The bearing holder has a size overlapping only the driven pulley, and is coupled to a left case, which is a constructional element of the transmission case, in the vicinity of the driven pulley. As a result, the rigidity for supporting the fixed pulley piece on the driven side can be increased, thereby enabling suppression of vibration by the driven pulley.

Abstract: Transmission unit for motor vehicles of the type containing a continuous variable transmission (2) consisting of an ingoing shaft (3), a driven shaft (4), two pulleys (5-6) situated on the ingoing shaft (3) and the driven shaft (4) respectively, and an endless transmission element (7) provided between said pulleys (5-6), whereby the above-mentioned pulleys (5-6) each consist of two pulley halves (8-9, 10-11) with conical contact surfaces (12) which can be axially adjusted in relation to one another, such that the transmission ratio between the ingoing shaft (3) and the driven shaft (4) can be continuously altered, whereby the transmission element (7) consists of a lubricated belt which is provided with metal parts (13) having contact surfaces (14) which work in conjunction with the above-mentioned conical contact surfaces (12) of the pulley halves (8-9, 10-11), and whereby the contact surfaces (14) of the parts (13) have a profiling (17), in particular a profiling (17) procuring a thin-film lubrication, where

Abstract: A device for changing the drive belt in a machine having power transmitted by a trapezoidal flexible drive belt, a circular adapter plate for attachment to the terminal end of the shaft having the pulley having the spring means having an attachable compressor with a bail and a connector yoke, the connector yoke being shaped approximating a semi-circular flattened annulus, the inner radius being sized to fit about the adapter plate carried on the shaft, the outer being sufficiently larger to provide the necessary strength and provide for the attachment of the bail; the bail being pivotally attached to the yoke and having a planer graspable handle and an offset bearing pad, the bearing pad extending outwardly from the plane of the bail and affixed proximate the pivotal attachment to the connector yoke forming the “L” shape of the bail, the bearing pad further being adapted to engage the extension of the movable sheave of pulley with the spring means.

Abstract: A fan drive arrangement and method is provided for facilitating the cooling of engine coolant flowing through a radiator and an engine. The fan drive arrangement includes a variable pitch sheave assembly which moves between a first high speed position and a second low speed position. Variable pitch sheave assembly is interconnected by first and second drive belts to first and second drive pulleys operatively connected to the crankshaft of the engine and by first and second fan belts to corresponding fan pulleys connected to a fan shaft of a fan. Variable pitch sheave assembly includes first and second drive belt receiving grooves for receiving corresponding drive belts therein and first and second fan belt grooves for receiving corresponding fan belts therein. The depths of the fan belt grooves and the drive belt grooves of the variable pitch sheave assembly are varied in response to the temperature of the engine coolant flowing through the radiator so as to vary the fan speed accordingly.

Abstract: A pulley gear for an infinitely-variable pulley drive has one pulley disposed on a drive shaft and another pulley disposed on an output shaft, and a transmission element circulating between the pulleys. An output side pressing force is applied to the output side pulley by a pressure medium and a drive side pressing force is applied to the drive side pulley by the pressure medium. The pulley gear has a valve that generates a torque-dependent pressure through the torque-dependent relative movement of a first ring, a jacket, and a second ring, thereby providing a load-dependent pressing force. A cylinder and the second ring form a first cylinder-piston aggregate, and the jacket and first and second rings form a second cylinder-piston aggregate. The first ring has a first cam track thereon and the second ring has a second cam track.

Abstract: A continuously variable reversible transmission including an input shaft (2), a housing (1), an input arm (4), first and second CVT shafts (5.6), a fixed input wheel (35), a ratio selector mechanism, an overall output wheel (36) and an output shaft (24). The input arm (4) is fixed to the input shaft (2) and extends substantially perpendicular to the input shaft. At each end of the input arm, a first (5) and second (6) CVT shaft is rotatably mounted, with the axes of the CVT shafts extending parallel to the input shaft. The fixed input wheel (35) may be aligned with the axis of the input shaft. The first CVT shaft (5) is coupled with the fixed input wheel (35), the second CVT shaft (6) is coupled with the first CVT shaft (5) and the output wheel (36) which is fixed to the output shaft (24) is coupled with the second CVT shaft.

Abstract: A belt type infinite variable-speed drive using a ball screw is proposed which is compact and noise-free. The nut of the ball screw mechanism is fixed to a casing and the threaded shaft is rotatably coupled to a movable pulley member through a ball bearing so that ball circulating portions on the nut will not rotate while the movable pulley member is movable axially. Also, the ball circulating portions, which are low in the load bearing capacity, are oriented in such a direction that load hardly acts on the ball screw mechanism. This makes it possible to compactly and rationally design a belt type infinite variable-speed drive and to suppress noise due to vibration of the balls in the ball circulating portions.

Abstract: The present invention relates to a friction clutch having a pair of clutch members opposite to each other in a radial direction with a plurality of rollers held between them, an angle of a turning axis of each roller relative to the rotation axis of a clutch member is made more than 10° and less than 20°, and in the meantime, the angle of the turning axis of each roller relative to the plane including the rotation axis of the clutch member is made more than 25° and less than 90°, so that a stable frictional force may be generated at all times. In this case, when a load in an axial direction is added to the clutch member, each roller generates sliding friction while turning, and therefore, a wear is extremely smaller than that of a structure of bringing the respective fellow clutch plates into surface contact with each other like a multiple disk clutch.

Abstract: The drive assembly has: an input member and an intermediate shaft; an axial clutch device for connecting the input member and the intermediate shaft in rotary manner; and a pulley connected in rotary manner to the intermediate shaft and defined by two half-pulleys movable axially with respect to each other and engaging a drive belt, the distance between the half-pulleys determining the winding radius of the belt. A push member, movable axially, along the intermediate shaft, between two limit positions, exerts thrust on the two half-pulleys to determine, in direct relation with its own axial position, the axial distance between the two half-pulleys, and alternatively exerts thrust on the clutch device to release the clutch device when moved axially in the direction increasing the distance between the half-pulleys. A control device is also provided to vary, on command, the axial position of the push member.

Abstract: A method and a device for actuating a motor vehicle clutch device (4). A control device (12) automatically influence the frictional power of the clutch device (4) in accordance with predetermined criteria (19) by varying the continuously variable ratio of a vehicle transmission (2).

Abstract: A belt-type continuously variable transfer system (15) includes a driving pulley assembly (20), a driven pulley assembly (22) and a V-shaped belt (24) engaged to transfer rotary power therebetween. The driven pulley assembly (22) can include a ratio adjustment mechanism (46) that adjusts the position of a rear sheave (40) relative to a forward sheave (42). The adjustment mechanism (46) includes a motor (170) and a worm gear mechanism (171, 172) that rotates an actuation screw (154). Rotation of the actuation screw (154) is reacted by a split nut (158) so that as the screw (154) rotates is translated along the axis (B) of the driven pulley assembly (22). Translation of the actuation screw (154) exerts pressure against the rear sheave (40) to push it toward the forward sheave (42), thereby altering the drive ratio of the pulley assembly.

Abstract: A thrust ratio calculation section 50 calculates a thrust ratio based on driving pulley thrust from a driving pulley thrust calculation section 44 and following pulley thrust from a following pulley thrust calculation section 48. A thrust ratio state of change identifying section 52 detects a peak of a thrust ratio caused by changing of the following pulley thrust, based on the thrust ratio and the following pulley thrust. The following pulley thrust is maintained such that the thrust ratio remains at the peak. This enables appropriate control of the pulley thrust.

Abstract: An apparatus for varying the rate of seed population by planters or drills, comprising first and second squeeze jack variable speed pulleys, and a belt running around the pulleys; a cog mounted on the first pulley and a cog mounted on the second pulley, and a drive chain running around the cog mounted on the first pulley and a row unit chain running around the cog mounted on the second pulley; and apparatus to vary selectively the speed of the row unit chain at any given speed of the drive chain.