Abstract: A pulley for a continuously-variable-ratio drive, having a fixed half-pulley fitted to a shaft of the drive; a movable half-pulley mounted to slide axially with respect to the fixed half-pulley to define with it a V groove of variable size for a V belt; and a torque-sensitive, axial thrust compensating device having an acceleration cam and a deceleration cam, which are interposed between the fixed half-pulley and the movable half-pulley to generate thrust on the movable half-pulley in the compression direction of the belt in response to both a drive torque and a braking torque.

Abstract: A driven pulley system for use in a torque converter of a vehicle is disclosed. The driven pulley system includes a cam. The cam is arranged to be removed from the driven pulley system for replacement of the cam.

Abstract: The driving pulley comprises two centrifugal mechanisms, namely a positive assembly and a negative assembly. Both assemblies comprise a respective set of flyweights subjected to the centrifugal force when the driving pulley rotates. The positive assembly is used as a conventional speed governor that moves one of the two flanges of the driving pulley towards the other in order to increase its winding diameter when the rotation speed increases. The negative assembly is used to apply an opposite force on the positive assembly when the rotation speed is above a threshold value so as to defer the upshift of the CVT to a higher ratio under the action of the positive assembly. This allows to maintain, for instance, a high rotation speed during an intense acceleration and a lower rotation speed when cruising at low vehicle speeds.

Abstract: A belt-driven clutch system having a driven clutch with a particular arrangement of cam followers and cam slots. One embodiment of the invention is a clutch having a fixed sheave, a movable sheave and a housing mounted to the movable sheave. The housing has a cam slot with first and second cam surfaces. The clutch also includes a pair of cam followers that is secured to the fixed sheave for acting upon the cam surfaces of the cam slot. A first cam follower of the pair of cam followers acts upon a first cam surface of the cam slot and a second cam follower of the pair of cam followers acts upon the second cam surface of the cam slot to reduce backlash. The invention also provides adjustment of spring tension and belt width of the clutch without requiring removal or disassembly of the clutch.

Abstract: The double-sided sliding button comprises two spaced-apart sliding button halves configured and disposed with reference to a curved medial axis. Each half has a front side, provided with a contact surface, and a rear side. Both contact surfaces are mutually opposite and both sides of each half intersect the curved medial axis. A bridge member allows to rigidly connect the rear side of the two halves. With this configuration, each sliding button can be easily installed and secured in a clamp attached to a part of the driven pulley. Each double-sided sliding button is capable of working in both directions, thereby reducing the number of individual sliding buttons to be installed by 50%.

Abstract: A belt tensioner for use with a torque converter to adjust the overall speed of a vehicle is disclosed. The belt tensioner includes motion transmitting fixed unit configured to be fixed to a vehicle output shaft for movement therewith and a belt tensioning movable unit configured for movement relative to the fixed unit. The fixed unit includes a cam and the movable unit includes a cam follower and a rotation limiter. The cam follower is configured to follow the cam to tension a belt located between flanges of the fixed and movable units. The rotation limiter is configured to engage the cam to limit relative rotation between the cam and the cam follower away from one another.

Abstract: A driven pulley system for use in a torque converter of a vehicle is disclosed. The driven pulley system includes a motion-transmitting fixed unit and a belt-tensioning movable unit. The fixed unit is arranged to be fixed to a rotatable output shaft of the vehicle for rotation therewith to transmit motion between the output shaft and a belt included in the torque converter and includes a fixed flange and a cam. The belt-tensioning movable unit is arranged for movement relative to the fixed unit and includes a movable flange and a cam follower. The fixed flange and the movable flange cooperate to receive the belt therebetween for engagement therewith. The movable flange includes a rotation limiter arranged to engage the cam to limit rotation of the cam relative to the cam follower in a second direction opposite to the first direction.

Abstract: The driven pulley comprises a first sheave and a second sheave coaxially mounted around a main shaft. The first sheave is fixed with reference to the main shaft while the other is allowed to slide and rotate with reference to the main shaft. The driven pulley is designed so that a portion of the second sheave can enter inside the first sheave. The return spring is also provided inside the driven pulley. This driven pulley can be designed as a reversible driven pulley by adding a second set of ramps and followers. The design of the driven pulley allows it to be constructed in a very compact manner and consequently, with a smaller weight compared to an equivalent conventional driven pulley.

Abstract: A vehicle with a continuously variable transmission (continuously variable transmission) includes a torque responsive clutch having a cam and at least one coupling. The cam has a plurality of projecting surfaces, and a plurality of slots being defined between the projecting surfaces. The slots of the cam are used to direct cam followers that move across the slot surfaces as the vehicle is driven forward or in reverse. As the vehicle adjusts from forward to reverse or vice versa, the cam followers may jump from one side of the slot to the other.

Abstract: A driven pulley system for use in a torque converter of a vehicle is disclosed. The driven pulley system includes a cam. The cam is arranged to be removed from the driven pulley system for replacement of the cam.

Abstract: A driven pulley system for use in a torque converter of a vehicle is disclosed. The driven pulley system includes a motion-transmitting fixed unit and a belt-tensioning movable unit. The fixed unit is arranged to be fixed to a rotatable output shaft of the vehicle for rotation therewith to transmit motion between the output shaft and a belt included in the torque converter and includes a fixed flange and a cam. The belt-tensioning movable unit is arranged for movement relative to the fixed unit and includes a movable flange and a cam follower. The fixed flange and the movable flange cooperate to receive the belt therebetween for engagement therewith. The movable flange includes a rotation limiter arranged to engage the cam to limit rotation of the cam relative to the cam follower in a second direction opposite to the first direction.

Abstract: A driven pulley system for use in a torque converter of a vehicle is disclosed. The driven pulley system includes relatively axially movable first and second flanges arranged to squeeze a belt of the torque converter therebetween. The driven pulley system also includes a spring positioner that includes a worm gear and a worm arranged to rotate the worm gear to wind or unwind a spring to cause relative axial movement between the first and second flanges to adjust the squeeze of the belt by the first and second flanges.

Abstract: The driven pulley comprises a first sheave and a second sheave coaxially mounted around a main shaft. The first sheave is fixed with reference to the main shaft while the other is allowed to slide and rotate with reference to the main shaft. The driven pulley is designed so that a portion of the second sheave can enter inside the first sheave. The return spring is also provided inside the driven pulley. This driven pulley can be designed as a reversible driven pulley by adding a second set of ramps and followers. The design of the driven pulley allows it to be constructed in a very compact manner and consequently, with a smaller weight compared to an equivalent conventional driven pulley.

Abstract: The invention relates to a contact pressure system, that can be utilized particularly for continuously variable transmissions, with a torque sensor system as well as a continuously variable transmission.

Abstract: A belt tensioner for use with a torque converter to adjust the overall speed of a vehicle is disclosed. The belt tensioner includes motion transmitting fixed unit configured to be fixed to a vehicle output shaft for movement therewith and a belt tensioning movable unit configured for movement relative to the fixed unit. The fixed unit includes a cam and the movable unit includes a cam follower and a rotation limiter. The cam follower is configured to follow the cam to tension a belt located between flanges of the fixed and movable units. The rotation limiter is configured to engage the cam to limit relative rotation between the cam and the cam follower away from one another.

Abstract: Provided is an infinitely variable cone pulley transmission for which the contact pressure between the cone pulley pairs and the traction is generated hydraulically on one transmission side and mechanical, with the aid of a spring, on the other transmission side. The second transmission side is provided with an axially fixed and an axially movable cone pulley with extended hub. The contact pressure mechanism includes a cam sleeve that is fixed relative to the shaft, a cam sleeve formed by the free end of the hub and roll bodies for the force transmittal, which are inserted between opposite arranged cam curves and rotate around axes extending radial to the transmission shaft. The roll bodies are guided by rings and are held at a mutual distance to each other and with spring force in the axial center region between the cam sleeves, wherein the spring is arranged coaxial on the extended hub.

Abstract: The invention relates to a speed transmission for a mower, in particular a lawnmower, comprising a speed changer. This transmission is characterized in that the speed changer is constituted by a transmission with a belt (5) between a drive pulley (6) mounted on the motor shaft (1) that bears the blades and a driven pulley (7) mounted on the input shaft (2) of the reducer (4), the drive pulley (6) and the driven pulley (7) each having flanges (6A, 6B) (7A, 7B) that are movable, the movement of the flanges (6A, 6B) of the drive pulley (6), ensuring continuous tensioning of the belt, being controlled automatically as a function of the couple transmitted between said pulleys by means of a member (8) for the continuous adjustment of the tension of the belt (5) while the movement of the flanges (7A, 7B) of the driven pulley (7), ensuring the speed change, is controlled manually by means of a control member (12).

Abstract: A driven element (100) has a first sheave (13) and a second moveable sheave (9). The sheaves (9 and 13) are rotatably tied together so that there is no relative motion between the two sheaves (9 and 13).

Abstract: A clutch assembly for a personal recreational vehicle is disclosed. The clutch assembly includes a stationary shave including a central shaft-receiving portion for receiving a shaft. The shaft-receiving portion includes first and second ends. Each of the first and second ends includes a seal receiving section. Sealing members are received into a respective seal receiving section. A volume is created between the shaft and the have receiving portion when the seals are received into their respective seal receiving section. Optionally, a lubricant can be confined within the sealed volume.

Abstract: A pulley for a continuously-variable-ratio drive, having a fixed half-pulley fitted to a shaft of the drive; a movable half-pulley mounted to slide axially with respect to the fixed half-pulley to define with it a V groove of variable size for a V belt; and a torque-sensitive, axial thrust compensating device having an acceleration cam and a deceleration cam, which are interposed between the fixed half-pulley and the movable half-pulley to generate thrust on the movable half-pulley in the compression direction of the belt in response to both a drive torque and a braking torque.

Abstract: A variable-speed V-belt drive includes: a drive pulley; a driven pulley including a fixed sheave with a cylindrical shaft and a movable sheave mounted on the cylindrical shaft so that the movable sheave can rotate and axially move; a V belt extended between the drive and driven pulleys; and a pressure mechanism of applying pressure to the movable sheave of the driven pulley. The pressure mechanism includes a helical cam groove formed in one of the cylindrical shaft and the movable sheave of the driven pulley, and a roller mounted on other of the cylindrical shaft and the movable sheave of the driven pulley so that the roller engages with the cam groove. The cam groove has opposite first and second working surfaces. The second working surface has a retaining surface of retaining the roller thereon when the vehicle travels in the engine-braking mode. The variable-speed V-belt drive can maintain the effect of engine brake at a high level even when traveling down a steep hill.

Abstract: The invention relates to a belt-driven clutch system having a driven clutch with a particular arrangement of cam followers and cam slots. One embodiment of the invention is a clutch having a fixed sheave, a movable sheave and a housing mounted to the movable sheave. The housing has a cam slot with first and second cam surfaces. The clutch also includes a pair of cam followers that is secured to the fixed sheave for acting upon the cam surfaces of the cam slot. A first cam follower of the pair of cam followers acts upon a first cam surface of the cam slot and a second cam follower of the pair of cam followers acts upon the second cam surface of the cam slot to reduce backlash and provide more responsive operation. The invention also provides adjustment of spring tension and belt width without requiring removal or disassembly of the clutch.

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 continuously variable transmission including two pairs of conical disks of which one disk of each pair is axially movable toward and away from the other disk and having an endless loop member in the form of a belt that passes around each pair of disks and transfers torque between the pairs of disks. The axially movable conical disk includes a contact pressure chamber to move the disk axially by the application of hydraulic pressure. The movable disk also includes an integrated torque sensor that is operative for controlling the contact pressure between the disks of a pair of disks and the endless loop member as a function of the torque.

Abstract: A one-way bearing or clutch is provided to decouple a continuously variable transmission from the final drive member during reverse torque conditions.

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: An adjustable ramp helix is disclosed for attachment to the clutch of a snowmobile or other vehicle. The adjustable ramp helix may include a base having a throat. Extending upwardly from the base opposite to the throat may be three equally sized ramp supports where each ramp support has an adjustable ramp. Each adjustable ramp is preferably pivotally attached to the top portion of a corresponding ramp support for positioning to the interior thereof. Each of the adjustable ramps includes an arcuate foot section which passes through an arcuate aperture in the base. A threaded outer dial collar may be rotatably engaged to the throat for positioning with respect to the collar. The collar engages the arcuate foot sections of the adjustable ramps to uniformly and simultaneously elevate the adjustable ramps above the ramp supports.

Abstract: The invention relates to a speed transmission for a mower, in particular a lawnmower, comprising a speed changer. This transmission is characterized in that the speed changer is constituted by a transmission with a belt (5) between a drive pulley (6) mounted on the motor shaft (1) that bears the blades and a driven pulley (7) mounted on the input shaft (2) of the reducer (4), the drive pulley (6) and the driven pulley (7) each having flanges (6A, 6B) (7A, 7B) that are movable, the movement of the flanges (6A, 6B) of the drive pulley (6), ensuring continuous tensioning of the belt, being controlled automatically as a function of the couple transmitted between said pulleys by means of a member (8) for the continuous adjustment of the tension of the belt (5) whilst the movement of the flanges (7A, 7B) of the driven pulley (7), ensuring the speed change, is controlled manually by means of a control member (12).

Abstract: A continuously variable drive element (100) has its torque transmission separate from its belt-squeezing function. The torque transmission is provided by only a first and second torque transmission tower and the belt-squeezing function is provided only by first and second belt-squeezing features. The preload of a compression spring is remotely adjustable without the need of disassembling the drive element.

Abstract: A variable-speed V-belt drive includes: a drive pulley; a driven pulley including a fixed sheave with a cylindrical shaft and a movable sheave mounted on the cylindrical shaft so that the movable sheave can rotate and axially move; a V belt extended between the drive and driven pulleys; and a pressure mechanism of applying pressure to the movable sheave of the driven pulley. The pressure mechanism includes a helical cam groove formed in one of the cylindrical shaft and the movable sheave of the driven pulley, and a roller mounted on other of the cylindrical shaft and the movable sheave of the driven pulley so that the roller engages with the cam groove. The cam groove has opposite first and second working surfaces. The second working surface has a retaining surface of retaining the roller thereon when the vehicle travels in the engine-braking mode. The variable-speed V-belt drive can maintain the effect of engine brake at a high level even when traveling down a steep hill.

Abstract: A continuously variable transmission comprising a main shaft (2), a fixed flange (14) and a movable flange (16), a first cam system comprising a cam plate (22) provided with cam surfaces (24), and corresponding cam followers (28), a second cam system also comprising a cam plate (40), provided with cam surfaces (42) and corresponding cam followers (46). During a normal forward rotation of the driven pulley (10), corresponding to a forward motion of the vehicle, the first cam system is automatically disabled and the position of the movable flange (16) is governed by the second cam system. However, under motor-braking conditions, the first cam system takes over the control and the second cam system is disabled. Similarly, the first cam system governs the position of the moveable flange (16) during normal reverse rotation of the driven pulley (10) and the second cam system takes over the control under motor-braking conditions as the vehicle is traveling rearwards.

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: Provided is a bevel gear unit with continuous gearing adjustment, for which the contact pressure between the bevel gear pairs and the traction means is generated hydraulically on one gear unit side and mechanically, with the aid of a spring, on the other gear unit side. For this, the second gear unit side is provided with an axially fixed bevel gear and an axially movable bevel gear with extended hub, wherein the bevel gears are connected so as to rotate jointly on their gear unit shaft and are coupled to the shaft via a contact pressure mechanism that depends on the rotational moment or a rotational moment and the gearing. The contact pressure mechanism consists of a cam sleeve that is fixed relative to the shaft, a cam sleeve formed by the free end of the hub and roll bodies for the force transmittal, which are inserted between opposite arranged cam curves and rotate around axes extending radial to the gear unit shaft.

Abstract: A one-way bearing or clutch is provided to decouple a continuously variable transmission from the final drive member during reverse torque conditions.

Abstract: The driven pulley (10) is used in a continuously variable transmission (CVT). It is coaxially mountable around a main shaft (12) and comprises two opposite conical flanges, namely a first flange (14) and a second flange (18), which face each other. An annular cam plate (40) is coaxially connected to the side of the second flange (18) that is opposite the first flange (14). The cam plate (40) comprises at least two inclined first cam surfaces (42) and at least two inclined second cam surfaces (44) having an inverted inclination with reference to the first cam surfaces (42). A first radially-extending support (50) bears a set of first cam followers (54). The first support (50) is at a fixed axial distance from the first flange (14) and each first cam follower (54) is engaged with a respective one of the first cam surfaces (42). Similarly, a second radially-extending support (60) bear a set of second cam followers (64).

Abstract: A continuously variable transmission for use in the power train of a motor vehicle has parallel input and output shafts, an adjustable pulley on each shaft, an endless torque transmitting chain or belt trained over the pulleys, and a torque sensor which transmits variable torque from the engine of the motor vehicle to the pulley on the input shaft. The torque sensor also serves to initiate and regulate the adjustments of the pulleys.

Abstract: A power transmission apparatus of a working machine transmits power of an engine to a drive wheel through a drive pulley, a belt, a driven pulley, an input shaft and a clutch. The driven pulley has a movable sheave fitted to the input shaft so as to rotate and move in the axial direction, and a fixed sheave fixed to the input shaft. When the clutch disconnects the movable sheave moves away from the fixed sheave, and when the clutch connects the movable sheave moves toward the fixed sheave. The engine power can be transmitted gradually avoiding abrupt transmission when the clutch connects.

Abstract: A variable speed belt drive bearing assembly including an enclosed helical ramp assembly or torque sensing helix (4) which is mounted on the driven or secondary clutch (20). The helix (4) includes a plurality of ramps (10) that include both an upper bearing surface (13) and a lower bearing surface (9). This arrangement ensures that the torque transferring roller or button (18) is always in contact with either one or both of the surfaces. The cover (68) of the driving or primary clutch assembly (65) includes an enlarged opening (61) to permit the mounting of a sleeve (60) which slides over the engine clutch shaft (66).

Abstract: A torque-responsive clutch has an output shaft and an output pulley mounted with respect to the shaft. The output pulley includes a first sheave fixed with respect to the shaft and a second sheave axially movable with respect to the shaft. A helix is mounted with respect to the shaft. In the improvement, a roller container is mounted for driven engagement with the shaft and such container has an interior surface with a plurality of helix-contacting devices, e.g., rollers, mounted adjacent thereto. The helix extends into the container and contacts the devices. In other aspects of the improved clutch, the roller container and the second sheave define a chamber and the helix-contacting devices are confined in such chamber.

Abstract: An infinitely variable speed transmission in which the transmission ratio results from the equilibrium of the total contact pressure force on the one V-belt pulley and the contact pressure force on the other V-belt pulley determined by a V-belt. The total contact pressure force having a torque-dependent proportion and a proportion which is a function of at least one outside operating parameter.

Abstract: The driven pulley is used in a variable-speed belt drive. It includes a clutch for transferring torque from the belt to the main shaft of the driven pulley. The clutch is alternatively movable between a disengaged position where the belt can still be in movement without transferring torque, and an engaged position where the torque is transferred to the main shaft. The clutch is controlled by the winding diameter of the belt. A plurality of rods is also provided for keeping the flanges from rotating relative to each other and for transferring torque from the flanges to a movable plate at the back of the clutch. This driven pulley reduces the wear of the belt, decreases the response time and increases the maximum torque that can be transferred compared with the conventional driven pulleys.

Abstract: The invention in a torque responsive actuator device for a belt drive system as is commonly utilized with snowmobile and like type vehicles. An actuator cover plate of the invention is connected by rods to a lower half of a split pulley, with the upper pulley half mounting a helix or cam cone extending towards the actuator cover plate undersurface that includes a plurality of cam tracks formed therein that are each to receive a cam follower for travel therealong that extends from the actuator cover plate undersurface. Movement of the actuator cover plate towards the top face of the pulley upper half is thereby translated through the rods to spread the pulley upper and lower halves apart, opening a V slot therebetween to a drive belt that is maintained therein.

Abstract: A cam for axially shifting the pulley faces of a variable width, torque sensing V-belt pulley in a variable speed, belt-type transmission system. The cam includes a plurality of cam lobes that extend in an axial direction at a predetermined radial distance from the pulley axis. Each cam lobe is triangular and is symmetrical about a cam lobe axis that is parallel with the pulley axis, and each cam lobe includes two cam surfaces that engage with respective cam followers to change the pulley face spacing as the load on the belt changes. The cam surfaces are convex and are in the form of circular arcs. The transmission system incorporating the cam structure is particularly suitable for vehicular use, and it provides improved performance by reducing engine overspeed upon initial acceleration and provides a smoother backshift when climbing hills.

Abstract: A transmission includes first and second members which are supported for independent rotation about an axis, and a drive arrangement which effects rotation of the first member about the axis in a rotational direction. A cam is provided on one of the first and second members, and a cam follower is provided on the other thereof, the cam follower being movable between positions disengaged from and engaged with the cam and the cam follower moving along the cam in response to rotation of the first member in the rotational direction relative to the second member when the cam follower is engaged with the cam.

Abstract: A continuously variable transmission utilizes a cam loading device with a hydraulically controlled CVT of the metal V-belt type. The cam loading device applies an axial loading force to the pulley flanges in proportion to the output torque. A hydraulic mechanism positions the pulley flanges to compensate for the limited axial movement of the cam mechanism. A preload spring and hydraulic cushion provide a necessary preload while cushioning shock from reversal of torque. The loading force on the CVT is permitted to vary with the output torque to provide improved efficiency for a full range of automotive driving conditions.

Abstract: A cone disk transmission, particularly for motor vehicles, has an infinitely settable and variable ratio. The transmission uses two pairs of cone disks (2, 3), connected by a coupling belt or chain (24). On cone disk of each pair is axially displaceable, and selectively positionable against the traction element running between the cone pairs by a hydraulic positioning system, for generating engagement or gripping or clamping forces. The positioning pressure is controlled by pressure fluid derived from a spool valve (10). Torque sensors (16, 17) located on the transmission shafts throttle return flow of hydraulic pressure fluid from the control valve, as a function of load. In accordance with the invention, the torque sensors are immediately activated as a function of the intended operating state of the transmission, that is, the direction of transfer of power between the pairs of cone disks, by coupling both of the torque sensors to a transfer valve (FIG.

Abstract: A belt-type stepless speed shifting transmission consisting of: (1) an input section having an input shaft with a rotational axis, a stationary pulley piece fixedly mounted on the input shaft, a pulley piece mounted on the input shaft and movable axially relative to the input shaft and stationary pulley piece with the stationary and movable pulley pieces cooperatively defining a groove for reception of a belt, and bearing structure for exerting an axial force on the movable pulley piece in the direction of the stationary pulley piece which axial force increases with the speed of the input shaft; and (2) an output section having an output shaft with a rotational axis, a second stationary piece fixedly mounted on the output shaft, a second pulley piece mounted on the output shaft and movable axially relative to the output shaft and second stationary pulley piece with the second stationary and movable pulley pieces cooperatively defining a groove for reception of a belt, a stop element, and cooperating cams on t

Abstract: In a pulley type speed-shifting device with a belt trained between a pair of variable speed pulleys, a movable sheave of each pulley is driven by a cam mechanism. Each cam mechanism has a cylindrical cam arranged concentrically with a rotary shaft and a cam follower which is arranged concentrically with a rotary shaft and carries a rolling body which makes contact with the cam as it is rolling on a cam face. The movable sheave is driven in axial direction by either the cylindrical cam or the cam follower rotating around the rotary shaft and rotating relatively to the other. As the cam follower makes contact with the cam face through the medium of the rolling body, resistance is small and the transmission ratio can be shifted with light handling force.

Abstract: A variable speed pulley adapted to be mounted on a shaft has a resilient member with an exterior surface adapted to support a belt thereon. The compression of the resilient member is controlled to adjust the location of the exterior surface of the resilient member. The effective diameter of the pulley increases or decreases as a function of the location of the exterior surface of the resilient member.

Abstract: An infinitely variable belt-type transmission for an agricultural machine or the like includes drive and driven pulleys and a pair of inversely variable diameter pulleys mounted on a shaft that is shiftable to vary the diameter of the pulleys and consequently the drive ratio of the transmission. The inner halves of the adjacent variable diameter pulleys are drivingly connected through a cam that exerts a force on the inner pulley halves tending to increase the pulley diameters and thereby increase the belt tension in response to an increase in torque transmitted through the transmission, and the shiftable pulley half on at least one of the pulleys is splined to its mating half so that the shifting movement in response to the torque increase results only in axial motion of the shiftable pulley half.