Abstract: An adjustable tensioner with a base, a pivot-arm that oscillates about a pivot secured to the base, a pulley attached to the pivot-arm, a compression spring with a first end operatively connected to the pivot-arm and a second end operatively connected to a shoe that presses a convex surface of the shoe against a concave arcuate surface of the pivot-arm, to the shoe held in place against a protuberance secured to the base by a balance of forces. An adjustment feature allows setting a base position with respect to an indicated predetermined belt spring force.

Abstract: A belt driving apparatus has a motor for generating the driving force, a toothed driving pulley rotating by the driving force, an endless toothed belt wound on the pulley, wherein a first surface of the toothed belt has teeth corresponding to teeth of the pulley and a second surface of the toothed belt is substantially smooth, an auxiliary roller for holding the toothed belt in a gap defined by the pulley and the auxiliary roller, a roller holding unit for holding the pulley and the auxiliary roller to be able to respectively rotate on axes of the pulley and the auxiliary roller and maintaining the gap between the pulley and the auxiliary roller and an urging member for urging the roller holding unit in a direction to the toothed belt around the pulley in order for the auxiliary roller hold by the roller holding unit to provide a tension to the toothed belt.

Abstract: In an auxiliary-driving system in an engine, a crank pulley, a first auxiliary pulley and an idler pulley having a tensioner function are disposed in a triangular configuration with the idler pulley located in an uppermost position; and a second auxiliary pulley is disposed in a space surrounded by these pulleys. An endless transmitting belt is reeved around the pulleys. An inner surface of the transmitting belt is reeved around the first auxiliary pulley; and an outer surface of the transmitting belt is reeved around the second auxiliary pulley. Thus, the adjustment of the tension of the transmitting belt and other maintenance are facilitated, the transmitting efficiency of the transmitting belt can be enhanced, and compactness of the auxiliary-driving system itself and improvement in mileage can be achieved.

Abstract: An asymmetric damping mechanism for use in a belt tensioner. The damping mechanism comprises two parts having substantially similar arcuate shapes for engaging a tensioner. The first part is in contact with the second part at a pivotable point of contact. The point of contact position is determined according to the desired asymmetric damping factor. The first part is also in contact with a spring. The second part is in contact with a tensioner arm. The damping mechanism also comprises two damping shoes, each having a damping band. The damping band is joined to the damping shoe by a plurality of vertical grooves on the damping shoe cooperating with a plurality of grooves on the damping band. The damping mechanism has an asymmetric damping factor in the range of approximately 1.5 to 5.

Abstract: A rotary grinding machine includes a rotary grinding member for grinding a workpiece on a workpiece feeding member. The grinding member is coupled with an output shaft of a motor through a drive transmission mechanism. The feeding member is coupled with the output shaft of the motor through a reduction gear mechanism, a transmission shaft and an endless tensible transmission member. To maintain an operating tension of the tensible transmission member when the feeding member is moved relative to the grinding member, a tensioning mechanism is disposed to enable effective transmission of a drive force from the reduction gear mechanism to the feeding member.

Abstract: A belt drive cantilever tensioner. The tensioner is particularly suited to belt drive systems having a high belt tension. The tensioner comprises a pulley journaled to a cantilever arm. The cantilever arm is pivotably attached to a mounting surface by a fastener at a pivot. The cantilever arm further comprises a hole disposed radially from the pivot for containing an embedded resilient member. A second fastener extends through the resilient member fixing it in a position relative to the first fastener. A load applied to the pulley causes the arm to pivot thereby causing a lever action to exert a force upon the resilient member. The resilient member has a limit of movement as well as an asymmetric force characteristic which increases in proportion to an arm rotation.

Abstract: A continuously variable transmission having an endless V belt running across a driving pulley and a driven pulley, a transmission ratio changing mechanism for changing the running diameters of the belt around the pulleys radially in opposite directions to each other, and a tension-adjusting unit for pressing the belt to obtain belt tension. The tension-adjusting unit includes a tension roller coming into pressure contact with the slack side of the belt from outside, a swing arm having an end rotatably supported on a transmission case, a link member having an end rotatably supporting a shaft of the tension roller and another end rotatably coupled with another end of the swing arm, and an urging member for swingingly urging the swing arm so that the tension roller presses the belt. A linkage structure having two degrees of freedom is used for supporting the tension roller, so that the tension roller can automatically move to a position where it does not interfere with either pulley at any transmission ratio.

Abstract: A system and method for tensioning a belt drive in a remotely controlled video camera is provided in which the belt drive tensioning system has an accessory pulley. A receptacle has a substantially circular opening and an extension. The extension is disposed partially around a periphery of an end of the circular opening and projects partially over the opening. A drive pulley is substantially coplanar with the accessory pulley. A housing has a body wall, a first longitudinal axis and a substantially circular tab provided at an end region of the body wall. The substantially circular tab has a second longitudinal axis which is parallel and eccentric to the first longitudinal axis. A drive pulley is substantially coaxially aligned along the first longitudinal axis and is rotatably coupled to the housing. The housing is configured to engage the receptacle in a first position where the drive pulley is at a first distance from the accessory pulley.

Abstract: A vehicle includes an automated drive device for powered sliding movement of the door into open or closed positions. The drive device includes a belt that cooperates with a track. A biasing member urges the belt into engagement with a corresponding portion of the track to ensure adequate engagement to achieve the desired movement of the door responsive to rotary movement of the belt. In one example, the belt and track include teeth that cooperate such that rotary movement of the belt results in linear movement of the door relative to the vehicle body.

Abstract: A two speed shift mechanism for a belt drive, including a rotatable shaft including a first pulley mounted thereon for rotation therewith, a tube concentric with the shaft and rotatable therearound, the tube including a shift hub mounted around a portion thereof for rotation therewith, and the shift hub supporting a second pulley in axially spaced relation to the first pulley for concentric rotation about the shift hub. The mechanism includes a collar mounted around the shift hub in the space between the pulleys for rotation with the shift hub and for axial movement relative thereto between a position adjacent the first pulley and a position adjacent the second pulley.

Abstract: A rotary shaft and a rotating body are connected in such a way as to stably control the tilt of a wafer platen in an ion implanter. The rotary shaft has a key way and the rotating body has a boss into which the rotary shaft extends. A key integrates the rotary shaft and the rotary body so that they rotate together without slipping relative to each other. An end cap is screwed onto the rotary body over the end of the rotary shaft and the key. As a result, the wafer platen can be maintained at an accurate orientation or tilt relative to the ion beam produced by the implanter.

Abstract: A continuously variable transmission comprises a driving pulley (11), a driven pulley (21), an endless dry-type belt (15) wound around both pulleys, a tension-adjusting device (50) arranged between the driving and driven pulleys for pressing the slack side of the belt to generate belt tension, stroke mechanisms (14, 22) provided on the driving and driven pulleys respectively for axially shifting the movable sheaves depending on inputted rotational force, a ratio-changing motor (40), and a gear mechanism for transmitting the rotational force generated by the motor to both stroke mechanisms as well as for mechanically connecting both stroke mechanisms in such a way that the movable sheaves of both pulleys can be shifted synchronously and axially oppositely in relation to the fixed sheaves. With this arrangement, the belt is prevented from slipping, the transmission ratio can be controlled precisely and stably, and the shift-response of this transmission can be improved.

Abstract: A belt driving apparatus has a motor for generating the driving force, a toothed driving pulley rotating by the driving force, an endless toothed belt wound on the pulley, wherein a first surface of the toothed belt has teeth corresponding to teeth of the pulley and a second surface of the toothed belt is substantially smooth, an auxiliary roller for holding the toothed belt in a gap defined by the pulley and the auxiliary roller, a roller holding unit for holding the pulley and the auxiliary roller to be able to respectively rotate on axes of the pulley and the auxiliary roller and maintaining the gap between the pulley and the auxiliary roller and an urging member for urging the roller holding unit in a direction to the toothed belt around the pulley in order for the auxiliary roller hold by the roller holding unit to provide a tension to the toothed belt.

Abstract: An engine accessory belt drive includes a self-aligning pulley assembly including a relatively stationary outer assembly and a universally pivotable inner assembly supported by the outer assembly and able to be locked in position by tightening of a fastener. During alignment of the self-aligning pulley with the belt, the fastener is maintained in the loose position, allowing limited universal pivoting of the rotational axis of the pulley as a result of belt tension forces which act to align the pulley. After the pulley is aligned, the fastener is tightened to fix the rotational axis of the pulley and the inner assembly in the aligned position of the pulley. Features of the inner and outer assemblies of the pulley assembly are also described.

Abstract: An idler pulley is provided with a plurality of attachment locations, or holes, extending through a hub portion of the pulley to allow the pulley to be attached to a stationary object in a plurality of alternative configurations in order to provide a way for adjusting or selecting the tension of a belt used in conjunction with the idler pulley. Threaded fasteners pass through selected attachment locations of the hub portion of the idler pulley and are threaded into anchor locations on a stationary object, such as an internal combustion engine.

Abstract: A vegetation mower incorporating a drive train using two mechanical transmissions to selectively drive the ground engaging wheels at different speeds. The drive train incorporates a single pulley belt to transfer power from the mower engine to the drive wheels.

Abstract: A tension roller with eccentric internal pivot and a tensioning device consists of a cylindrical roller having a shape adapted for each type of transmission housing one or several roller bearings, which are integral with a hub including a large base plate pivoting about a fixed axis. The eccentricity between the fixed axis and the axis of rotation of the roller enables, by the pivoting of the device about an axis, to cause the roller to travel along a circular path, with an amplitude twice the value fo the eccentricity, which provides the tensioning stroke of the transmission. The flange, housed in the hub, in its central part, is actuated by the screw clamping the device on the bearing surface. The hub may comprise one or several driving arms which enable to simultaneously exert and measure the tensile load of the transmission, using standard clamping tools available off-the-shelf.

Abstract: The invention is an improved locked-center idler of the type having a pulley supported by a bearing. The bearing is mounted upon a tension adjusting member. It is improved by the tension adjusting member being in communication with a dual function fastener.

Abstract: A piston rod position detecting mechanism is proposed which can detect continuously or in a multiple-point manner that the piston rod position has changed due to increase or decrease in the protruding amount of the piston rod due to aging. The protruding amount from a cylinder end wall is detected by a position detecting mechanism comprising a detecting coil housed in a bobbin provided at the cylinder end, a flange portion formed on the piston rod, and a coil spring. Also, an autotensioner and an electromagnetic valve with such a position detector are proposed. Further, a belt tension adjusting device is provided with a detector for detecting the position of a tension pulley which is pivotable with increase or decrease in the belt tension.

Abstract: An idle wheel adjustment assembly has a generally L-shaped frame, a coiled spring, an oblong rocking frame, a first shaft pin, a first bearing, a first idle wheel, a second shaft pin, a second bearing, and a second idle wheel. The generally L-shaped frame has a through hole and an end column. The oblong rocking frame has a main shaft, an upper pillar, an upper circular hole, and a lower round hole. The first bearing is inserted in the first idle wheel. The second bearing is inserted in the second idle wheel. The first shaft pin is inserted through the upper circular hole and the first bearing. The second shaft pin is inserted through the lower round hole and the second bearing. The main shaft is inserted through the through hole. The coiled spring has a first hook end connected to the upper pillar and a second hook end connected to the end column.

Abstract: Crank drive belt systems feature a triple pulley tensioner which may be applied in various ways to provide proper tensioning on belt spans adjacent a motor generator for both starting and generating functions of the system. The tensioner provides adequate belt wrap and damping functions for the systems. In a simplified embodiment, the belt system connects a crankshaft or crank pulley with a motor generator pulley and at least one accessory drive pulley, such as an air conditioner compressor. The triple pulley tensioner includes a fixed tensioner housing mounting a fixed rotatable pulley and two tensioner arms carrying pulleys for tensioning the belt spans on either side of the motor generator. The fixed pulley is positioned on a third belt span between the accessory and the crank and combines with the tensioner pulleys to maximize belt wrap around the MG pulley, the crank pulley, and the accessory pulley, if needed. Numerous alternative arrangements may be provided.

Abstract: An asymmetric damping mechanism for use in a belt tensioner. The damping mechanism comprises two parts having substantially similar arcuate shapes for engaging a tensioner. The first part is in contact with the second part at a pivotable point of contact. The point of contact position is determined according to the desired asymmetric damping factor. The first part is also in contact with a spring. The second part is in contact with a tensioner arm. The damping mechanism also comprises two damping shoes, each having a damping band. The damping band is joined to the damping shoe by a plurality of vertical grooves on the damping shoe cooperating with a plurality of grooves on the damping band. The damping mechanism has an asymmetric damping factor in the range of approximately 1.5 to 5.

Abstract: A tensioner for generating tension in a power-transmitting belt is provided. The tensioner includes a base, which may be secured to an engine, and an arm that is movably attached to the base. A pulley is rotatably attached to the arm for engaging the belt. A spring is operatively connected to the arm and the base for urging the arm to move relative to the base in a first direction. When the arm is moved in the first direction, the pulley is moved into engagement with the belt with a force to tension the belt. The tensioner further includes a stop that is adjustably positioned on the base to limit the movement of the arm in a second direction. The position of the stop on the base may be automatically adjusted by the spring during installation of the tensioner.

Abstract: A combination starter-generator system for use in a vehicle is provided. The vehicle has an internal combustion engine and a battery. The system includes a starter-generator electrically coupled to the battery to generate a current and to start the internal combustion engine. A drive mechanism connects the starter-generator machine and the internal combustion engine. The starter-generator machine generates the current by receiving a charging torque from one side of the drive mechanism and starts the internal combustion engine by imparting a starting torque to a different side of the drive mechanism. The charging torque or the starting torque is a greater torque. A passive tensioning system cooperates with the drive mechanism to tension the drive mechanism only at the side of the greater torque.

Abstract: The invention is an improved belt drive system of the type having an automatic belt tensioner, an automatic belt tensioner pulley, a crankshaft pulley, an accessory pulley, and a power transmission belt trained about the automatic belt tensioner pulley, the crankshaft pulley, and the accessory pulley. It is improved by the inclusion of an initial tensioner.

Abstract: A traction device for an internal combustion engine includes a tensioning device having two lever arms of different lengths which are rigidly connected together and which are pivotally mounted for rotation about a rotation axis. Each of the lever arms supports on one end a tension pulley. The tensioning device is provided for positioning the tension pulleys on a pulling strand and a return strand by imposing an elastic force thereon.

Abstract: The invention comprises an asymmetric damping tensioner system for belt drives on an engine. A belt is connected between a driver pulley on a crankshaft and any number of driven pulleys. Each driven pulley is connected to an accessory such as an alternator, power steering pump, compressor or the like. The tensioner is placed anywhere before the first component of significant effective inertia, in the belt movement direction. A biasing member in the tensioner is used to maintain a tension in the belt. The tensioner further comprises a damping mechanism to damp belt vibrations caused by the operation of the engine. Tensioner damping friction is unequal or asymmetric, depending upon the direction of movement of the tensioner arm. During acceleration the damping friction of the tensioner in the unloading direction is significantly lower than the damping friction in the opposite, or loading direction, as is the case during deceleration.

Abstract: The invention comprises a belt drive cantilever tensioner. The tensioner is particularly suited to belt drive systems having a high belt tension. The tensioner comprises a pulley journaled to a cantilever arm. The cantilever arm is pivotably attached to a mounting surface by a fastener at a pivot. The cantilever arm further comprises a hole disposed radially from the pivot for containing an embedded resilient member. A second fastener extends through the resilient member fixing it in a position relative to the first fastener. A load applied to the pulley causes the arm to pivot thereby causing a lever action to exert a force upon the resilient member. The resilient member has a limit of movement as well as an asymmetric force characteristic which increases in proportion to an arm rotation.

Abstract: A method and system are taught for a tensioner for an endless power transmission belt in an engine. The method and system comprise an AGS pulley and crankshaft pulley coupled to the belt, one of the AGS pulley or the crankshaft pulley operating as a driving pulley that drives the belt so that a tight span and slack span are created in the belt on opposite sides of the driving pulley. The method and system also comprise accessory pulleys coupled to the belt. The tensioner comprises first and second arms, each arm rotatably coupled to a pulley, the pulleys being positioned such that a first one of the pulleys is coupled to the tight span and a second one of the pulleys is coupled to the slack span.

Abstract: The invention comprises a method of using tensioners to tune a belt drive system. A tensioner having a damping rate is used on an accessory belt slack side and a tensioner having a having a damping rate is used on an accessory belt tight side. Outside of a predetermined engine speed range, the tight side tensioner arm does not move because the dynamic tension in the span is less than the tight side tensioner friction damping. Within a predetermined engine speed range the tight side tensioner arm moves in order to damp a belt drive system vibration.

Abstract: A belt tensioner for a power transmission belt is provided that operates on an endless path and that utilizes asymmetric motion control. The belt tensioner has an arm with a belt engaging section and a drum section, a support member for securing the tensioner relative to the belt, where the arm pivots about the support member, and a tension spring that urges the arm to pivot about the support member in a first direction and urges the belt engaging section against the belt with a force to tension the belt. The belt tensioner further comprises a cavity between the arm and the support member and a bushing comprising a bowed flange positioned in the cavity.

Abstract: A combination comprises a belt trained about a plurality of pulleys and a tensioner assembly including a rotary member rotatively engaged by one side of the belt at an operative position. The rotary member is rotatably mounted on an arm pivoted about a fixed pivotal axis and has a rotational axis parallel with the fixed pivotal axis. The vector force applied by the belt to the periphery of the rotary member at the bisector of the belt wrap angle extends through the rotational axis and is related by at least a small angle to a line passing through the rotational and pivotal axis. The vector force acts in a direction to bias the arm to pivot about the pivotal axis in a direction to move the rotary member into the operative position. The rotary member is initially installed into the operative position by moving the arm in the direction from an installation position.

Abstract: A belt tensioner for a power transmission belt may be provided that operates on an endless path and that utilizes asymmetric motion control. The belt tensioner may have an arm with a belt engaging section and a drum section, a support member for securing the tensioner relative to the belt, where the arm pivots on the support member, and a tension spring that urges the arm to pivot about the support member in a first direction and urges the belt engaging section against the belt with a force to tension the belt. The tensioner also may have a fluid filled chamber inside a portion of the drum section of the arm and a valve pivotally attached to the tensioner so that the valve extends across the fluid containing chamber.

Abstract: An idler assembly which is easily removable from a mower deck is disclosed. The idler assembly is rotatably mounted to the mower deck about a shouldered shaft and held in place by an easily removable spring clip. An idler pulley is rotatably attached to the other end of the idler arm. A spring is connected to a spring clip which is secured to the top of the idler arm. The spring causes the idler arm to rotate about the shouldered shaft and forces the idler pulley to apply tension to the drive belt. The idler arm also includes an extension which protrudes beyond the radius of the idler pulley to contact a snubber or bumper. The snubber is secured to the mower deck by a snubber bracket.

Abstract: A transmission drives a radial fan about a fan axis in a vehicle cooling unit including a plurality of heat exchangers arranged to surround the radial fan to receive a radial air flow therefrom. A driving pulley, a driven pulley, and a idler pulley of the heat exchangers.

Abstract: A belt tensioner for a power transmission belt is provided that operates on an endless path and that utilizes asymmetric motion control. The belt tensioner has an arm with a belt engaging section and a drum section, a support member for securing the tensioner relative to the belt, where the arm pivots about the support member, and a tension spring that urges the arm to pivot about the support member in a first direction and urges the belt engaging section against the belt with a force to tension the belt. The tensioner also has a stator inside the drum section utilized to form arcuate spaces circumferentially spaced around the stator between the stator and the drum section and arcuate shaped wedges in the arcuate spaces.

Abstract: A belt tensioner for a power transmission belt is provided that operates on an endless path and that utilizes asymmetric motion control. The belt tensioner has an arm with a belt engaging section and a drum section, a support member for securing the tensioner relative to the belt, where the arm pivots about the support member, and a tension spring that urges the arm to pivot about the support member in a first direction and urges the belt engaging section against the belt with a force to tension the belt. The tensioner also has a stator inside the drum section utilized to form arcuate spaces circumferentially spaced around the stator between the stator and the drum section and arcuate shaped wedges in the arcuate spaces. The tensioner further has a Bellville spring coupled to the arm and a friction device positioned between the wedges and Bellville spring.

Abstract: A damping mechanism used in a tensioner for tensioning a power transmission belt including a damping plate having a friction surface, at least one ramp surface and first and second contact points for operatively connecting a spring whereby the spring torque applied to damping mechanism in combination with a reactive force at the pivot surface generates a normal force.

Abstract: A tensioner having a pulley journaled to a housing. The housing further comprises a guide. The guide slidingly engages rails on a base. The guide and rails constrain the housing to move in a predetermined linear path. The rails are horizontally offset from two axis defined by the pulley. The pulley load is also vertically offset from the axis of movement of the guide. The guide and rails have a predetermined frictional coefficient so that the cumulative result is an asymmetric damping effect. Further, a linkage is connected between the housing and a camming body. The camming body is rotatably connected to the base. A biasing member such as a torsion spring biases the camming body against the belt load through the linkage. The radius of the camming body is variable to maintain a constant belt load as the tensioner pulley moves in response to a load change.

Abstract: A tensioner for an endless power transmission belt, the belt being driven about a sheave. The tensioner may comprise a base, a resilient device, and first and second arms pivotally coupled for movement in an open and a closed direction. The tensioner may also comprise first and second pulleys rotatably coupled to the first and second arms, the resilient device biasing the arms in the closed direction in which the first and second pulleys apply tension to the belt. The tensioner may also comprise first and second stops positioned outside the arms on the base to limit the movement of the arms in the open direction in response to an increase in tension in the belt.

Abstract: A drive belt tensioning method and assembly using a spring loaded, non-active tensioner. The spring is mounted between a base plate, and a tensioner arm, both of which rotate. A belt tensioning pulley is mounted on the tensioner arm, such that the belt tensioning pulley is adjacent to the drive belt. The tension of the spring causes the tensioner arm to rotate which causes the belt tensioning pulley to tension the drive belt. The spring chosen has a predetermined working length at which the drive belt has the desired tension. Because both the base plate and the tensioner arm rotate, the spring may be kept at this predetermined working length for each belt adjustment. This enables the drive belt to maintain the desired tension. An alignment index integral to the assembly may be used to ensure that the spring is at the predetermined working length.

Abstract: A combination belt tensioner and idler has a fixed pivot structure. A moveable arm is mounted for pivotable movement about the pivot structure. A belt tensioning pulley is mounted on the moveable arm. A helical coil spring biases the moveable arm in a direction so as to force the pulley into tensioning engagement with a belt. A mounting bolt mounts the fixed pivot structure on a motor vehicle engine. An idler pulley is mounted for rotational movement about an axis defined by the mounting bolt.

Abstract: The invention comprises a belt tensioner having a pivot arm biased toward a belt by a torsion spring. The tensioner also comprises a one-way clutch coupled with a friction clutch. The pivot arm of the tensioner is connected to a one-way clutch. The one-way clutch is cooperatively connected to a friction clutch having a predetermined friction torque caused by frictionally engaged radially extending surfaces. The pivot arm may move relatively freely toward a belt by operation of the one-way clutch. At the limit of arm movement the one-way clutch engages, preventing travel away from the belt in an opposite direction. The arm may only travel away from the belt when a belt tension torque exceeds the spring force plus a friction torque of the friction clutch.

Abstract: A belt apparatus is provided for use in a document processing system having a baseplate, a removable bearing assembly connected to the baseplate and having a drive pulley to which a drive belt is drivingly coupled. The belt apparatus comprises a bracket coupled to the baseplate and for supporting the drive belt when the bearing assembly including the drive pulley is removed from the baseplate. The bracket supports the drive belt below the baseplate to allow the drive belt and the drive pulley of a replacement bearing assembly to be easily coupled together without having to lift the baseplate to gain access to the space below the baseplate. Preferably, the bracket comprises a substantially U-shaped bracket. The bracket may include a pair of flanges on which the drive belt rests when the bearing assembly is removed from the baseplate. The pair of flanges extend in substantially opposite directions relative to each other and substantially parallel with the plane in which the baseplate lies.

Abstract: The invention comprises a self-contained mechanical belt tensioner that produces damping which is a function of the applied hubload through the effect of frictional forces derived from the sliding action of mutually opposing wedges. A first wedge or conical piston is contained within a housing. The conical piston cooperates with a second or conical wedge. A surface of the conical wedge slides on the inner surface of the housing. The conical wedge is expandable in a direction normal to the inner surface of the housing. A spring urges the conical wedge into engagement with the conical piston. As the pulley is loaded, as with an impulse load, the piston will move into the conical wedge. This, in turn, will cause the conical wedge to expand against the inner surface of the housing. The expansion of the conical wedge in the housing will increase the frictional force between the conical wedge and the housing. This will have the effect of damping movements of the conical piston and, in turn, of the pulley.

Abstract: An idler assembly which is easily removable from a mower deck is disclosed. The idler assembly is rotatably mounted to the mower deck about a shouldered shaft and held in place by an easily removable spring clip. An idler pulley is rotatably attached to the other end of the idler arm. A spring is connected to a spring clip which is secured to the top of the idler arm. The spring causes the idler arm to rotate about the shouldered shaft and forces the idler pulley to apply tension to the drive belt. The idler arm also includes an extension which protrudes beyond the radius of the idler pulley to contact a snubber or bumper. The snubber is secured to the mower deck by a snubber bracket.

Abstract: Use of the present invention enables the alignment and servicing of the rear derailleur of a bicycle without having the rear wheel or a specialized fixture mounted in the dropouts. For the present invention, the apparatus is placed on the frame of the bicycle and the chain routed over a toothed pulley. A tensioning spring in the apparatus provides the proper chain tension and allows the rear derailleur to be serviced or aligned.

Abstract: An autotensioner comprises a cup-shaped stationary member, an arm rotatably attached to an opening of the stationary member. An axial bore is formed in the bottom of the stationary member. A rocking wall extending to the bottom is provided at the arm. A first friction member is provided between the rocking wall and the inner wall of the opening. The first friction member is gripped between the rocking wall and the inner wall. A rocking shaft extending to the bottom is provided at the center of a lid portion of the arm. The rocking shaft is inserted in the axial bore. A second friction member is provided between the rocking shaft and the axial bore. The first friction member and the second friction member are formed of a synthetic resin mainly comprised of PPS, exhibit high limited PV factors, and exhibit low coefficients of friction.

Abstract: A tensioning device for attraction mechanism including a receiving and mounting housing, a roller carrier pivotably connected to the mounting housing, a bearing which radially supports the roller carrier relative to the mounting housing, a spring between the roller carrier and the mounting housing for applying a tensioning force, and a damping device. The damping device includes a damping bush which, by friction, dampens any movement between the roller carrier and the mounting housing in such a way that damping is greater in the direction of an increasing tension force than in the direction of decreasing tension force. A flat band spring applies the friction force to the damping bush. The flat band spring is secured, at a first end, to the receiving and mounting housing in a rotationally fast way, and at a second end to the damping bush in a rotationally fast way.

Abstract: A continuously variable transmission has an endless V belt (15) running across a driving pulley (11) and a driven pulley (21), a transmission ratio changing mechanism for changing the running diameters of the belt around the pulleys radially in opposite directions to each other, and a tension-adjusting unit (50) for pressing the belt to obtain belt tension. The tension-adjusting unit (50) includes a tension roller (51) coming into pressure contact with the slack side of the belt (15) from outside, a swing arm (53) having an end rotatably supported on a transmission case (6), a link member (52) having an end rotatably supporting a shaft of the tension roller (51) and another end rotatably coupled with another end of the swing arm (53), and urging means (54, 55) for swingingly urging the swing arm (53) so that the tension roller (51) presses the belt (15).