Abstract: A deep groove ball bearing having an inner ring, an outer ring and a plurality of rolling elements set between the inner and outer rings. The rolling elements have a diameter DW?0.5H1, up to DW?0.35H1. H1 is the radial dimension of the bearing in the sense of thickness and is numerically equal to half of the difference between the outer diameter and inner diameter of the bearing.

Abstract: A continuously variable transmission including a first pulley means, a second pulley means and an elongate, flexible endless transmission element that is passed over both the first pulley means and the second pulley means, wherein the first pulley means include two sheaves which are adjustable in an axial direction of the first rotation axis line, and an adjusting means for moving the two adjustable sheaves toward and away from each other in the axial direction for setting an operative radius of the first pulley means at which the transmission element is passed over the first pulley means, wherein the first pulley means is provided with alignment means for causing the two movable sheaves to jointly move additionally in the axial direction of the first rotation axis under the influence of a force exerted in axial direction on the first pulley means by the transmission element while maintaining the operative radius.

Abstract: A cone-pulley flexible transmission is disclosed that comprises a first shaft having a first cone-pulley pair and a second shaft having a second cone-pulley pair. The first and second cone-pulley pairs each have a first cone pulley movable in an axial direction and a second cone pulley stationary in the axial direction. A flexible transmission means may be arranged between the first and second cone-pulley pairs for torque transmission. The first and second shafts may be rotatably supported by a bearing. The bearing of the first shaft or the second shaft may be a fixed bearing. The fixed bearing may include an inner bearing ring arranged on an outer circumferential surface of a corresponding shaft and an outer bearing ring fastened to a transmission housing by a sleeve extending through a wall of the transmission housing.

Abstract: A chain (endless flexible member) is looped over an input pulley and an output pulley. Each of the input pulley and the output pulley includes a pair of a fixed sheave and a movable sheave. The fixed sheave and the movable sheave have tapered faces that are opposed to each other to define a V-shaped groove. A vibration damping plate (vibration damping member) is fixed to each fixed sheave, and is in contact with the outer peripheral face of the fixed sheave. When the fixed sheave vibrates, the vibrations are damped by the friction between the outer peripheral face of the fixed shave and the vibration damping plate.

Abstract: An arrangement for supplying oil to a chain drive which drives a transmission oil pump that is axially offset relative to a torque converter and embedded in an intermediate plate in a vehicle having a torque converter. The driven sprocket of the chain drive is supported by a converter neck mounted in a centering plate. A seal is provided between the converter neck and the sprocket and is arranged adjacent the sliding fit between the converter neck and the sprocket. To compensate for the suppression of lubrication of the seal, the neck bearing and the chain drive, a valve is integrated in the intermediate plate, and a duct is provided in the plane, in which the centering plate is screwed to the intermediate plate, such that excess oil flowing from the valve is selectively directed to the seal, the neck bearing and the chain drive.

Abstract: A continuously variable transmission belt includes rings each superimposing annular component pieces on each other's inner and outer peripheries, and plural elements attached to the rings side by side in a circumferential direction. Each element includes a neck portion. The rings are disposed on opposite sides of the neck portion. The elements contact a driving pulley and a driven pulley. A lubrication oil discharge mechanism discharges out a lubrication oil in at least one of a gap between the component pieces, and a gap between each ring and the elements. A function of discharging the lubrication oil present in a region remote from the neck portion is higher than a function of discharging the lubrication oil present in a region near the neck portion. Thereby, the rings to which the elements are attached or the component pieces of the rings restrain decline in the centering characteristic in the width direction.

Abstract: Continuously variable transmission with a drive belt (3) and with two pulleys (1, 2) that are each provided with two pulley discs (4, 5) with a running surface (8) for arriving in friction contact with a side face (35) of the drive belt (3), wherein both the running surfaces (8) of the pulleys (1, 2) and the side face (35) of the drive belt (3) are made of steel and wherein during operation of the transmission the friction contact is cooled by lubrication oil. At least one of the running surfaces (8) is provided with a multitude of (micron-scale) dimples (11, 13) and/or of grooves (12, 14, 15) arranged in a specific pattern for taking up lubrication oil.

Abstract: A motorcycle compensator-sprocket-wheel-hub lubricating system has a lubricant-collection plate (2) (30) attachable to a sprocket-gear housing (1) of a motorcycle for catching lubricant falling from a sprocket-wheel chain (4) and conveying the lubricant to a compensator-sprocket-wheel hub (33) which is provided with enhanced lubrication of rotating-contact and sliding-contact parts with lubricant conveyed from the lubricant-collection plate (2) (30).

Abstract: A transmission 20 includes an input shaft 12, an output shaft 13, a primary sheave 23 that rotates together with the input shaft 12, a secondary sheave 24 that rotates together with the output shaft 13, and a belt 25 wound around both the primary sheave 23 and the secondary sheave 24. The transmission 20 includes a motor 22 that shifts a transmission ratio by driving a movable sheave 23a of the primary sheave 23. A control device (ECU 5) of the transmission 20 includes a secondary sheave rotation speed sensor 28 that detects rotation of the belt 25, and a control portion 55 of the ECU 5 performs a sheave position control (normal control of the transmission ratio) after rotation of the belt 25 is detected after starting.

Abstract: A CVT transmission comprising a shaft journalled to a housing, a first sheave fixed to the shaft, a second sheave moveable parallel to an axis of rotation of the shaft, the second sheave locked in rotating relation with the first sheave by a first sheave member cooperatively engaged with a second sheave receiving member, the second sheave receiving member disposed at a helical angle (HA) with respect to the axis of rotation, a sprocket journalled to the housing, the sprocket threadably engaged with a movable member, a bearing disposed between the movable member and the second sheave, the movable member engaged with the housing whereby movement of the movable member is parallel with the axis of rotation, an electric actuator engaged with the sprocket, and the second sheave is axially movable upon a rotation of the sprocket.

Abstract: When a minimum thickness h of a part where an outer ring raceway is provided on a middle portion in the axial direction of an outer ring and a diameter Da of each rolling element satisfy the relationship 0.4Da?h 0.8Da, even when the outer ring is fixed in a transmission case of low-rigidity, elastic deformation of the outer ring can be prevented without increasing the thickness of the outer ring. When an outer diameter D of an outer ring, a width W of this outer ring in the axial direction, a minimum thickness h of a part where the outer ring raceway is provided on a middle portion in the axial direction of the outer ring, and a diameter Da of each ball are controlled such that a value K calculated by {(h1.5·W)/(Da1.1·D0.5)} satisfies the relationship 1.20?K?2.00, sufficient rigidity of the outer ring can be maintained, and premature flaking based on elastic deformation of the outer ring can be prevented without needlessly increasing the size of the outer ring.

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: 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 bearing for engaging an associated shaft and an associated body for axial movement on the associated shaft which includes a housing; a first set of a plurality of mounting shafts carried by said housing, each mounting shaft in said first set of a plurality of mounting shafts having a center line; and a first set of a plurality of rollers, each roller being carried a respective one of said plurality of mounting shafts and mounted for rotation about the centerline of the respective mounting shaft, each roller being dimensioned and configured for abutting relationship with the associated shaft.

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 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: A lubrication device for a belt type continuously variable transmission is provided in which a nozzle tube (25) communicating with an oil supply source (26) is disposed between a drive pulley (5) and a driven pulley (6) of a belt type continuously variable transmission (2) along the axial direction of the drive pulley (5) and the driven pulley (6), this nozzle tube (25) being provided with first and second oil spray holes (27, 28) for spraying oil toward belt grooves (12, 21) of the two pulleys (5, 6) respectively, wherein the first oil spray hole (27) is made to be open toward a large-diameter portion of a belt contact face (21a) of a fixed pulley half body (19) of the one, of the drive pulley (5) and the driven pulley (6), that is positioned on an upstream side of the nozzle tube (25), and the second oil spray hole (28) is made to be open toward the belt groove (12) of the other of the drive pulley (5) and the driven pulley (6) at a position downstream of the nozzle tube (25) relative to the first oil spray

Abstract: A motorcycle including a power transmission device including a continuously variable transmission having a belt wound around a drive pulley and around a driven pulley and a hydraulically-operated clutch provided on at least one of a drive pulley shaft and a driven pulley shaft and an internal combustion engine wherein a supply of working oil to the clutch and of lubricating oil to a continuously variable transmission is enabled while avoiding a complication of an oil passage configuration and an increase in the diameter of the pulley shaft. A clutch control oil passage directs working oil to a clutch and a lubricating oil passage directs lubricating oil to a continuously variable transmission are provided in the particular pulley shaft on which the clutch is provided, so as to be coaxial with each other and be axially isolated from each other.

Abstract: In a motorcycle having a V-belt type continuously variable transmission, a resin washer made of a nylon resin is interposed between a boss fixed to a moving sheave half of a secondary sheave and a spring bearing member. The boss contacts the spring bearing member through the resin washer, whereby the moving sheave half is restricted to a Top position, in which a spacing between it and a stationary sheave half becomes maximum. In this manner, the maximum speed is not changed by exchange of the V-belt, the V-belt does not slip or become considerably abraded or deteriorated, and noise generation is suppressed.

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 continuously variable transmission has an input pulley assembly connected to a first transfer pulley assembly with a first chain and a second transfer pulley assembly connected to an output pulley assembly with a second chain. The first transfer pulley assembly and the second transfer pulley assembly shaft a common shuttle disk that moves axially on a countershaft that carries the first and second transfer pulleys. The input pulley assembly and the output pulley assembly are generally axially aligned and a bearing carrier is positioned between the pulleys. A high pressure fluid supply system reduces or eliminates axial loading on the shafts of the transmission.

Abstract: Transmissions and drive systems for a self-propelled machine and related methods are provided. An input shaft having an axis and extending transverse to an output shaft is provided. The input shaft can be rotatable about the axis of the input shaft and configured to drivingly engage the output shaft. A variable pitch pulley can be disposed axially on the input shaft and configured to rotate about the axis of the input shaft. The variable pitch pulley can be configured to change pitch diameter to regulate the speed at which the input shaft is rotated. Further, the input shaft can be at least partially rotatable about an axis of the output shaft to vary the pitch of the variable pitch pulley to regulate the speed at which the input shaft drives the output shaft.

Abstract: A continuously variable transmission has an input pulley assembly connected to a first transfer pulley assembly with a first chain and a second transfer pulley assembly connected to an output pulley assembly with a second chain. The first transfer pulley assembly and the second transfer pulley assembly shaft a common shuttle disk that moves axially on a countershaft that carries the first and second transfer pulleys. The input pulley assembly and the output pulley assembly are generally axially aligned and a bearing carrier is positioned between the pulleys. A high pressure fluid supply system reduces or eliminates axial loading on the shafts of the transmission.

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 power unit including an internal combustion engine with a crankshaft and a power transmission system. The power transmission system being equipped with a belt-type continuously variable transmission having a drive shaft and a driven shaft. The belt-type continuously variable transmission being disposed below the axis of the crankshaft wherein the torque from the crankshaft is transmitted to the drive shaft for rotating the crankshaft and the drive shaft rotate in opposite directions. An output shaft, linked and interlocked with the driven shaft via a gear transmission system, is disposed above the continuously variable transmission. A gear transmission mechanism includes a single idle shaft, which has an axis parallel to the crankshaft, and being arranged between the driven shaft and the output shaft for rotating the driven shaft and the output shaft in the same direction.

Abstract: A continuously variable transmission having two pairs of conical disks operatively connected by an endless torque-transmitting belt. One of each of the disk pairs is axially movable relative to the other along a supporting shaft. The movable disk includes an inner tooth system that engages with an outer tooth system formed on the supporting shaft. The internal tooth system can be produced by a broaching process. The inner tooth system extends outwardly of the conical disk.

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 regulatable continuously variable transmission in which one multiple-jet nozzle (4) is used for supplying cooling and lubricant oil to the variator. The flow diameter (9, 10) of the nozzle (4) is created so that a stationary flow exists in the nozzle (4) and the continuity equation results in a constant value.

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: In a chamber R1 which accommodates a transmission device comprising a drive pulley 8, a driven pulley 9 and a belt 10, a cover 51 is provided to cover the lower peripheral portion of the drive pulley 8 along the periphery. The drive pulley is positioned below the driven pulley, and raised portions 52 which are used for the detection of the rotational speed of the drive pulley are provided on the periphery of the drive pulley. The end surface 51bs of the cover facing the inner wall 54 of the pulley chamber is positioned away from the inner wall with a clearance V therebetween. In a vehicular transmission which is constructed in this arrangement, the amount of lubrication oil that flows near to the periphery of the pulley which is positioned lower is comparatively small. Thus, this arrangement restricts agitation of the lubrication oil, which may be caused by the raised portions of the rotating pulley.

Abstract: A housing 2 for a vehicular transmission comprises a first room R1 which accommodates a continuous speed change mechanism and a second room R2 which accommodates a driving force transmission mechanism including a starting mechanism, a reduction train, a differential mechanism, a power supply mechanism for an oil pump, etc. In each room, inlet openings 72 through 74 for oil discharge passages are provided near and above both the sides of an oil pan 26 in the horizontal direction perpendicular to the input and output shafts of the continuous speed change mechanism, to return lubrication oil to the oil pan 26. Also, walls 61 through 65 are provided in the rooms to lead the lubrication oil into the respective inlet openings. In this construction, the lubrication oil returning from each room to the oil pan 26 is stabilized at each room and discharged to the oil pan 26, and thereby the lubrication oil achieves homogeneity in the oil pan 26.

Abstract: An adjustable-slope torque bracket which includes an annular ramp support for holding multiple triangularly shaped camming ramps. The annular support includes a squared "U" shaped annular recess which opens in the direction of the axis of rotation of the annular support. Each of the triangular shaped camming ramps has a base portion which is shaped to fit within the annular recess. The base portion is raised slightly from the bottom of the recess and pinned between the inner and outer walls of the recess by an axle positioned adjacent one end of the base. The other end of the base is free to move relative to the bottom wall of the annular recess when the camming ramp pivots about the axle. An adjusting bolt is threadably inserted through the free end of the camming ramp and is of sufficient length to abut the bottom wall of the annular recess to raise or lower the free end of the base portion relative to the bottom wall of the annular recess.

Abstract: A modularly constructed pulley for a continuously variable transmission, provided with at least two discs on a pulley shaft and/or sleeve of the pulley shaft, one or more discs fixed as individual components to the pulley shaft and/or sleeve, and having at least one disc which is axially displaceable, by, e.g., a piston/cylinder assembly with pistons or cylinders individually fixed to the disc.

Abstract: This idler pulley includes a pulley body 1 made, e.g., by pressing a steel plate, and a ball bearing 2 fitted in the inner diameter of the pulley body 1. The contact position Z on the pulley peripheral surface 1a1 of the pulley body to be contacted by the belt center and the bearing centerline Y of the ball bearing 2 are axially offset by an amount .delta..

Abstract: A continuously variable transmission of an automotive vehicle has a start assist device, a forward-reverse changeover device, and a V-belt type transmission. The changeover device has an input shaft for receiving power from the start assist device. The V-belt type transmission has a drive shaft connected to a drive pulley. The input shaft and the drive shaft are aligned along a common longitudinal central axis. A fluid passage arrangement for the transmission includes a hydraulic fluid passage for a chamber of the drive pulley, which passage includes mutually communicating axial holes formed in the input shaft and the drive shaft. One of the axial holes communicates with a hydraulic fluid supply, while the other axial hole communicates with the chamber. The fluid passage arrangement further has lubricating fluid passages for the transmission and the changeover device.

Abstract: Method for lubricating and/or cooling a transmission unit, in particular a transmission unit of the type which makes use of a continuously variable transmission (2) with pulleys (5-6) and an endless transmission element (7) provided in between, at least one hydraulic cylinder/piston unit (13) with a pressure chamber (15) which cooperates with the continuously variable transmission (2), and a pressure compensation chamber (23) cooperating with the above-mentioned pressure chamber (15), wherein at least part of the hydraulic medium coming out of the pressure compensation chamber (23) is guided back via a number of parts of the transmission unit (1) to be lubricated and/or cooled, so as to provide for the lubrication and/or cooling of these parts.

Abstract: An arrangement is proposed for guiding a movable disk (3) in a continuously variable belt-drive transmission. The movable disk (3) is supported on balls (4) embedded in a mounting (5). The mountings (5) are interconnected in a narrow area. The axial travel of the arrangement is determined by bearing surfaces.

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: In a continuously variable transmission, a bolt hole of a casing and a female screw hole of a bearing fixing plate are arranged such that the bolt hole positionally corresponds to the female screw hole when an outer diameter portion of a bearing is engaged with a recess of the plate, and a pin of the plate is inserted into a positioning hole of the casing.

Abstract: The present invention provides a radial drive connection between a movable flange and the shaft of an adjustable pulley. Specifically the movable flange is driven through the use of supports fixed to the shaft which radially fix the movable flange while allowing for axial movement. The supports are provided through a rigid disc splined to the shaft. The disc has an annular extension extending therefrom. Attached at one end to the disc and at the opposite end to the extension is at least one guide. Each guide includes a bolt or pin and an annular sleeve. The movable flange is configured to have a foot which has an annular wall to it. Through this wall the movable flange slidably engages the guide and provides a radial drive connection. Because the wall and guide slide, however, the movable flange is permitted to move in the axial direction.

Abstract: The present invention provides a radial drive connection between a movable flange and the shaft of an adjustable pulley. Specifically the movable flange is driven through the use of supports fixed to the shaft which radially fix the movable flange while allowing for axial movement. The supports are provided through a rigid disc splined to the shaft. The disc has an annular extension extending therefrom. Attached at one end to the disc and at the opposite end to the extension is at least one guide. Each guide is made from a bolt or pin and an annular sleeve. The movable flange is designed to have a foot which has an annular wall to it. Through this wall the movable flange slidably engages the guide and provides a radial drive connection. Because the wall and guide slide, however, the movable flange is permitted to move in the axial direction.

Abstract: A high pressure circuit is connected between a secondary pressure control valve and a lockup clutch control valve for actuating a lockup clutch of a torque converter. A low pressure circuit is connected between the lockup clutch control valve and a continuously variable transmission. A high relief valve is provided in the high pressure circuit for controlling the lockup clutch with high pressure. A low relief valve is provided in the low pressure circuit for lubricating a transmission belt so as to improve cooling efficiency.

Abstract: A lubricating system which is for an automatic transmission having planetary gear sets and producing various speeds by selectively engaging friction elements. The lubricating system is provided with a first lubricating circuit which usually supplies lubricant to planetary gear sets, bearings and the like, and a second lubricating circuit which supplies lubricant to friction elements during a shift.

Abstract: A speed variator pulley provided with reduced flexion removable rings is used in a variable speed transmission of the V pulley type, provided with a trapezoidal belt. Transmissions of this type are, for example, used in snow scooters, motorcycles, utilitarian or pleasure vehicles or cars without permit or of the TQM type. The pulley of the invention has an arrangement which makes it possible to reduce the axial friction forces which are the cause of a hysteresis effect in the operation of the pulley.

Abstract: A non-stage automatic transmission for vehicles includes a pair of adjustable pulleys supported for rotation within a transmission casing, and an endless metal belt which is wound around and frictionally engaged with the pulleys for rotation therewith. A mechanism for supplying lubricating oil between the belt and the pulleys is provided, along with an arrangement for directing lubricating oil, which has been scattered from the belt onto the transmission casing, back toward the belt.

Abstract: A bearing assembly for a continually variable cone-pulley belt drive transmission includes a primary shaft defining a conical pulley that is rotatably mounted, and an axially displaceable conical pulley that is movable along the axis of the primary shaft. A secondary shaft rotatably mounted parallel to the primary shaft defines an axially nondisplaceable conical pulley and an axially displaceable pulley movable parallel to the axis of the secondary shaft. The pulleys on the primary and secondary shafts are drivably connected by an endless drive belt that engages the pulleys on the shaft at a variable radius, whereby the secondary shaft is driven at a variable speed with respect to the primary shaft. The primary and secondary shafts are mounted in the casing of the transmission by a fixed bearing and a loose bearing. The fixed bearing on the primary shaft has its outer race easily displaceable by an axial-linear guide in the form of a group of ball bearings carried in a bearing cage.

Abstract: A variable speed drive pulley, especially for automobile vehicles, comprises coaxial first and second pulley flanges which rotate with a hub and are in axial face-to-face relationship to receive a belt between them. At least the first pulley flange is a mobile pulley flange slidably mounted on the hub with radial clearance. It is thus movable along the hub between two extreme configurations, in at least one of which a primary bearing surface on the mobile pulley flange is in axial face-to-face relationship with a secondary bearing surface. An anti-friction member is disposed axially between the primary and secondary bearing surfaces.

Abstract: A pulley device has a shaft provided at its one end with a disk extending radially outwardly therefrom, a tubular member provided at its one end with a disk extending radially outwardly therefrom and concentrically enclosing the shaft to cooperate with the disk of the shaft to define therebetween a V-shaped annular groove for a driving belt, and a roll pin extending in the shaft in the diametrical direction of the shaft so as to engage with both of the shaft and the tubular member. In order to facilitate the relative sliding movement between the shaft and the tubular member, oilless bearings are provided to both ends of the tubular member. Furthermore, an oilless bushing is disposed between the roll pin and the tubular member or the shaft to facilitate the rolling of the roll pin.

Abstract: A pulley device comprises a pair of discs both slidably mounted onto a driving shaft and urged by the respective coil springs, three roll pins provided in the respective discs and extending radially, and a pair of end members each having a cylindrical portion in which three axial notches are formed for receiving the roll pins. These roll pins are borne in the openings of the discs by means of the oilless bearings disposed therein for a rotation about the axis of the roll pin and for a slidable movement along the axis thereof.