Abstract: The assembly method includes packaging of items for shipment and secures components of the assembly in a fashion and in the related position required for further assembly, as a unit, to an engine that is in the process of being assembled. The timed assembly arrives at the engine plant secured together such that it allows handling, at least in part, as a single component and with its parts arranged in the relative position required for proper timing and for securing to other components of the engine. The chain (44) is pinned between a tensioner pin (66) and the tensioner chain contacting surface (60) and between a guide pin (74) and the guide or snubber chain contacting surface (88). The tensioner is preferably pinned in a state of minimum extension.

Abstract: In a tensioner for a timing chain, a spring-biased plunger for urging a shoe into sliding engagement with the chain is temporarily held in a retracted condition, prior to installation of the tensioner, by a stopper having a pin that extends through a hole in the tensioner housing and engages a grove formed in the plunger. The stopper is bent so that its handle extends away form the pin axis at an angle greater than zero but not greater than 90°. Removal of the stopper from the tensioner can be carried out by rotating the handle to avoid interference with engine components in the vicinity of the tensioner.

Abstract: A blade tensioner comprising a blade shoe, a sliding surface with a first and a second side, a ratchet rod attached to the distal end of the blade shoe having a length of teeth, and a spring clip for receiving the ratchet rod and being slidable along the second side of the sliding surface. When the slack on the chain increases, a distal end of the blade shoe pivots and slides on the first side of the sliding surface, and the spring clip slides on the second side of the sliding surface a distance limited by the engagement of the tab of the spring clip with the corresponding indentation on the second side of the sliding surface and the edge of the spring clip engages the teeth of the ratchet rod.

Abstract: Longitudinal grooves having rectangular cross-sections are formed by surface pressing in the front and/or back surfaces of the metal base plate of a chain guide. In the case of a chain guide for a roller chain, the grooves can be positioned so that they are located opposite the parts of the shoe surface that is contacted by the link plates on both sides of the chain.

Abstract: A tensioner for imparting tension to a chain having a body, a resilient chain guide element, at least one blade spring, and at least one bracket. The body of the tensioner has a surface with a profile of the path of a new chain and a groove found longitudinally along the length of the surface. The resilient chain guide element, on the surface of the body has a chain contact surface and two ends wrapped around the ends of the body, with the chain guide being sufficiently larger than the body, such that the chain contact surface is capable of being biased away from the body. The blade spring is present in the groove with its end in the containments means of the groove, biasing the chain guide out and away from the body. At least one bracket is fixedly attached to the body and has a pivot.

Abstract: A guide for an engine timing chain comprises a metal supporting base and a resin shoe, the shoe having integrally formed hooks for attachment to the supporting base, and integrally formed side walls for limiting lateral movement of the chain on the sliding contact surface of the shoe. A central portion of the shoe has a sandwich injection molded structure and comprises a high strength core of glass fiber-reinforced polyamide resin, and a polyamide skin layer. The side walls and the hooks are formed entirely of the skin layer material.

Abstract: A belt guide and an image forming apparatus having the same are disclosed. The image forming apparatus includes a belt supported by supporting rollers and circulates endlessly. A belt guide is disposed on contact portions between the belt and each of the supporting rollers to prevent a separation of the belt from the supporting rollers. The belt guide is formed in a multi-step concave-convex shape, e.g., a staircase-like shape or a square wave shape. Accordingly, a contact area between the belt and the supporting roller is maximized, thereby effectively preventing wear, separation and color mis-registration of the belt due to meandering thereof.

Abstract: A toothed plate-link chain composed of a plurality of interconnected plates that form chain links. The chain links are hingedly interconnected to adjacent links by transversely-extending hinge pins. A least some of the links include outer guide plates having convexly-curved ends that are so configured that the ends of adjacent guide plates contact each other when the chain is at a predetermined limiting angle of deflection during a swing-back mode, which deflection direction is in a direction opposite to the direction of deflection of the chain as it passes around a toothed wheel. The limitation of chain deflection during a swing-back mode serves to limit the frequency and amplitude of strand oscillations and thereby reduces the noise that would otherwise result from strand oscillations.

Abstract: A belt assembly, particularly for driving camshafts of an internal combustion engine, includes a driving gear, at least one driven gear, a belt, and a first and a second tensioner blade that are joined to one another for transmitting a defined force and motion. One tensioner blade can be subjected to the action of tension force by use of a first tensioning device supported on the tensioner blade on one side and externally on the other, and the tensioner blades can be subjected to the action of tension force by use of a second tensioning device both with regard to one another as well as with regard to a case of the internal combustion engine.

Abstract: A straddle type all terrain vehicle is provided with a chain guide for covering an outer peripheral edge of at least an engaged portion of a driven sprocket with a drive chain from outside in a radial direction inside a chain cover. A rear axle housing is formed with upper and lower flange portions extending upward and downward at opposite end portions in the vehicle width direction of the rear axle housing. The rear axle housing is coupled to a rear end portion of the rear swing arm for swinging forward and rearward about mounted portions of the upper flange portion. The chain cover is mounted on the swing arm side and the chain guide is mounted on the rear axle housing side, respectively.

Abstract: A tension or guide rail for a flexible drive means, in particular for a timing chain of an internal combustion engine, with a carrier body and guide track which can be pressed onto the flexible drive means, where the tension or guide rail comprises an installation channel which is independent of the action of the guide track. The carrier body can comprise at least a first and at least a second carrier-body side part, which are permanently joined together and which jointly define the installation channel. Furthermore, an internal combustion engine with a timing drive comprising a flexible drive means and at least one such tension or guide rail, whereby the flexible drive means is in contact with the guide track and an additional component acting interactively with the internal combustion engine extends through the installation channel at least in some regions.

Abstract: A device for detecting the speed of an endless torque-transmitting member that passes around a pair of spaced conical pulley pairs of a continuously variable transmission. The device includes a sensor that is positioned adjacent the endless torque-transmitting member and that detects the speed of the endless torque-transmitting member at a point that is located relative to the movement course of the endless torque-transmitting member that is independent of the rotational speed relationship of the pulley pairs.

Abstract: A mechanical power-transmission system with chain including a mechanical tightener acting on a branch of the chain and having in turn a base, a tightening shoe in dragging contact with the chain and a sliding wedge under the thrust of a first spring in an irreversible manner between the base and the shoe to cause progressive withdrawal of the base and the shoe in the tightening direction of the chain so that between the wedge and the shoe there is an elastic thrust member for thrusting the shoe in the tightening direction.

Abstract: In a guide for a transmission chain, a slide rail elongated in the direction of travel of the chain, and having a front surface for sliding engagement with the chain, is supported by a rail support which extends perpendicularly from the back side of the slide rail. The guide is formed by sandwich molding and comprises a glass fiber-reinforced polymer resin forming a core of the rail support, and a wear-resistant polymer resin forming both the slide rail, and a skin layer on the rail support, the skin layer of the rail support being unitary with the slide rail. A plurality of hollow, heat-dissipating, cavities extend inwardly from both sides of the slide rail in directions transverse to the direction of elongation of the slide rail.

Abstract: In a guide for a timing chain, a slide rail and a rail support are formed by sandwich molding. The rail support includes a core formed of a glass fiber reinforced polyamide 66 resin and a skin layer formed of a polyamide 66 resin. The slide rail is composed entirely of a polyamide 66 resin and is continuous with the skin layer of the rail support. A narrow connecting region formed of polyamide 66 resin is disposed between the rail support and the slide rail. The narrow connecting region prevents the glass fiber-reinforce resin from entering the slide rail in the sandwich molding process.

Abstract: A guiding and tensioning device for chain drives in vehicles is provided, having a guiding and tensioning element that can be fastened at a supporting part (4) of the vehicle and can be brought into an effective contact with the chain (1) of the chain drive. The device is provided as a rail (2) arranged in a plane of the chain drive and supported at the carrying part (4), which in order to reduce oscillations created by the chain drive can be acted on by at least one actuator with a force acting in the direction of the chain. In order to effectively and permanently suppress chain whining in such chain drives, the rail (2) is provided as a carrier supported on two supports. One support is formed by a drag bearing (3) arranged on the supporting part (4) in a locally fixed manner and the other support is a movable support (8) on the rail (2), which can be displaced in the longitudinal direction. At least one actuator (6a, 6b, 6c, 6d) is arranged between the supports and engages the rail (2).

Abstract: A transfer guide for a high-speed power transmission, which can cancel a change in a transmission chain speed so that smooth transmission timing can be realized and a driving power and vibration noises of the transmission chain can be significantly reduced. A curve track T for a transfer guide 100 for a high-speed power transmission disposed in a transfer position X2 just before a transmission chain, which is traveled at a fixed speed by pressing the chain on the inner circumferential side of the chain with a travel limiting guide R, is meshed with a sprocket S, is defined along an movement passage of the roller C2 in the transfer position X2. Thus, the change in the transmission chain speed is canceled so that smooth transmission timing can be reliably realized and the driving power and vibration noise of the transmission chain can be significantly reduced.

Abstract: In a chain drive for an internal combustion engine, said chain drive comprising a driving wheel (2), a driven wheel (3), an endlessly circulating chain (1) that connects the driving wheel (2) and the driven wheel (3), a chain tensioner (9) acting on the slack strand (7) of the chain (1), and an additional tensioning device (12) that is loaded by a spring (13) and acts on the tight strand (6) of the chain (1) while being arranged for pivoting, a further driven wheel (4) is installed in the tight strand (6) of the chain drive and is used as a driving wheel for a rotatably mounted compensating shaft for offsetting free forces and moments that occur during operation of the internal combustion engine.

Abstract: A tensioning device for a chain drive of an internal combustion engine, having a support member (1) which is pivotally mounted thereupon and is axially snapped onto and retained on a bearing journal (4) of the support member (1) via a bearing lug (5). The support member (1) is formed as a deep-drawn sheet metal component and is formed in a single piece with the bearing journal (4). The bearing journal (4) is provided with a cup-shaped hollow form. The tensioning rail (2) is axially secured to the support member (1) by a wrap-around (12).

Abstract: A chain guide, such as a fixed chain guide or a tensioner arm, includes a bracket adapted for being secured to an associated engine. The bracket includes a support surface, a leading end and a trailing end spaced from the leading end in a chain movement direction. A guide blade includes a leading end, a trailing end spaced from the leading end in the chain movement direction, a chain guide surface and an inner surface positioned adjacent the support surface of the bracket. The guide blade is selectively movable slidably on the support surface in the chain movement direction and an opposite direction between a first position where the blade is separable from the bracket and a second position where the blade is fixedly secured to the bracket.

Abstract: In a pivoting guide for a traveling transmission chain, composed of a synthetic resin body having a shoe and a slotted reinforcement, and a plate fitting into the slot, the plate has a mounting hole received on a boss formed on the guide body and coaxial with a mounting hole on the guide body which receives a pivot shaft. This structure facilitates assembly and mounting because the plate is securely attached to the guide body before the assembly is mounted. The plate does not contact the pivot shaft, and therefore full advantage is taken of the self-lubricating property of the synthetic resin. The boss may be elongated so that the length of the mounting hole of the guide body is greater than the width of the shoe so that wear in of the guide body due to biased loads is dispersed, and the useful life of the guide is extended.

Abstract: A device having an allowance for creeping is provided. The device includes: a base member having a receiving element; and an overlaying member, subject to creeping, overlaying on top of the base member, the overlaying member having a region at one end thereof, wherein a tip member is free from restriction or force exerted thereon due to creeping deformation thereof.

Abstract: A pivoting chain guide and tensioner assembly for use with an endless chain loop comprising: at least one bracket plate, a tensioner attached to the at least one bracket plate, and a guide attached to the bracket plates. The bracket plate surrounds the chain at least partially between a driving and a driven sprocket and at least one of the plates has a hole for a pivot at a center axis. The tensioner comprises a tensioner arm with a chain sliding face for contacting the outside of the chain and a biasing means. The guide has a chain sliding face that contacts the outside of the chain. When a high local load is applied to the chain, the load is received by the end of the guide, forcing the guide to move away from the chain, such that the bracket plate pivots, moving the tensioner relative to the chain.

Abstract: A wear strip easily mountable on an outer surface of a support member or structure of a feeder of an agricultural combine, for preventing wear of the support member and a feeder chain movable thereover. The wear strip includes an elongate body of a molded plastics material having a longitudinal extending side to be positioned in facing relation to the chain and an opposite longitudinally extending mounting side to be mounted on the support member, the mounting side including at least one molded plastics mounting tab extending outwardly therefrom in a position for insertion into at least one hole through the support member, respectively.

Abstract: In a sliding contact guide for a flexible power transmission medium such as a chain or belt, the guide body includes a shoe and a plate-receiving portion integrally molded as a unit from a synthetic resin. A reinforcing plate is inserted into a slot in the plate-receiving portion. A surface of the reinforcing plate is of a concavo-convex shape. The concavo-convex shape enhances the strength of the reinforcing plate without increasing the overall weight of the guide. By controlling the spacing of the bend lines forming the concavo-convex configuration, the strength of the guide can be controlled in accordance with strength requirements for different regions of the guide.

Abstract: A chain guide with Multiple Joints having a plurality of sections (62, 64, 66) with each section conjoined together via a link (68) is provided. Each of the plurality of sections (62, 64, 66) has a partial upper side (12i) which forms, in part, an upper side of the chain guide. All of the partial upper side (12i) of the plurality of sections (62, 64, 66) together form the upper side of the chain guide.

Abstract: To enable the simultaneous achievement of the enhancement of an oscillation absorption function of a tensioner arm for a transmission chain and the enhancement of wear resistance in a chain tensioner. A tensioner arm is composed of an elastic band tensioner arm body curved toward a transmission chain and a flexible tensioner shoe which covers the front of the tensioner arm body and which is provided with a chain guide groove to the front of which the transmission chain is slidably fitted. The width of the middle in the longitudinal direction of the tensioner arm body is set so that the width is smaller than the width of each end of the arm body.

Abstract: The present invention provides a blade-type tensioner system for a chain that can easily improve spring properties. A blade-type tensioner includes a blade shoe and a blade spring positioned on the back side of chain sliding surface of the blade shoe so as to impart tension to a chain through the blade shoe. The blade shoe is pivotably supported around a shoulder bolt inserted into a proximal end portion of the blade shoe, and a distal end portion of the blade shoe is slidably supported on a supporting face provided in the engine. The distal end portion of the blade shoe contacts a flat, first supporting face at a point. When tension in the chain is increased, the distal end portion contacts a concave, second supporting face at a point which is continuous with the first supporting face.

Abstract: A slide rail and a rail support are integrally formed from a high-strength first polymer resin. A wear-resistant second polymer resin, applied to the slide rail and rail support in the process of sandwich molding, entirely covers the slide rail and rail support, including the inner circumferential surface of a pivoting hole in the rail support, and an engine block-engaging seating surface of a boss surrounding the pivoting hole. The tensioner lever exhibits excellent mechanical strength and wear resistance, low weight and reduced production cost, and can be recycled easily. The covering of wear-resistant polymer particularly prevents wear on the inner circumferential surface of the pivoting hole and the seating surface of the boss.

Abstract: A wear strip easily mountable on an outer surface of a support member or structure of a feeder of an agricultural combine, for preventing wear of the support member and a feeder chain movable thereover. The wear strip includes an elongate body of a molded plastics material having a longitudinal extending side to be positioned in facing relation to the chain and an opposite longitudinally extending mounting side to be mounted on the support member, the mounting side including at least one molded plastics mounting tab extending outwardly therefrom in a position for insertion into at least one hole through the support member, respectively.

Abstract: A synthetic resin guide for a chain, or other flexible transmission medium comprises a synthetic resin guide body having a shoe on which the transmission medium slides, and a slotted, plate-receiving portion integrally molded on the back side of the shoe for receiving a reinforcing plate. The plate-receiving portion is composed of a pair of opposed, longitudinally extending, slot-defining walls. A convex pressing member, integrally molded with one of the walls protrudes into the slot through a partially cut-away portion of the wall and exerts a resilient pressing force on the reinforcing plate. The guide suppresses shock noises due to wobbling of the guide during operation. Increased molding tolerances are made possible, and higher productivity in the assembly of the guide is achieved.

Abstract: A preassembled drive means unit provided with a support body comprising at least one wheel receiver, which is adapted to receive therein a respective drive means wheel, and an endless drive means, which is adapted to be put around said drive means wheels. This drive means unit comprises a replaceable mounting aid which is arranged in the area of the wheel receiver instead of a drive means wheel. One or a plurality of the drive means wheels can be replaced by the mounting aid. The whole preassembled drive means unit is held in position by the mounting aid, although one or a plurality of the drive means wheels of the drive means unit are not installed. In this way, it will be more easily possible to assemble the drive means unit and to attach the drive means wheels.

Abstract: A device such as a chain tensioner arm and the method of forming the same are provided. The device includes a top wearing member and a bottom structural member, in which the device is produced by forming the top wearing member and the bottom structural member in a single molding cycle.

Abstract: A belt drive for a machine for printing images on a flat printing material, having a continuous belt revolving during operation, includes a belt guide having stops for two protruding edges of the belt, the edges being oriented in a longitudinal direction of the belt and opposite one another in a transverse direction of the belt; and a machine for printing images on flat printing material having such a belt drive.

Abstract: A chain guide includes a bracket adapted for being secured to an engine. The bracket includes a support surface including a leading end and a trailing end, and further includes a first saw-tooth fixing element. A guide shoe includes: (i) a shoe leading end; (ii) a shoe trailing end spaced from the shoe leading end in a chain movement direction; (iii) a chain guide surface extending between the shoe leading end and the shoe trailing end and adapted for slidably supporting an associated chain moving in the chain movement direction; and, (iv) an inner surface positioned adjacent the support surface of the bracket. The guide shoe further includes a second saw-tooth fixing element that mates with the first saw-tooth fixing element of the bracket to inhibit disconnection of said the guide shoe and the bracket.

Abstract: A blade-type tensioner for applying tension to a chain comprising a base, an arcuately shaped blade shoe having a chain sliding face, a spring provided on a back side of the blade shoe, and a guide member. The blade shoe has a proximal end portion and a distal end portion, where the proximal end portion is swingably supported on the base, and the distal end portion is slidably supported on a slide plate of the base. The slide plate is arcuately shaped to form a concavely arcuate arc face on an opposite side of the distal end portion of the blade shoe, and the distal end portion of the blade shoe has a convexly arcuate arc face corresponding to the concavely arcuate arc face of the slide plate. The distal end portion of the blade shoe is guided by a self-aligning action of the concavely arcuate arc face of the slide plate in such a way that the distal end portion is centrally positioned in a lateral direction on the slide plate.

Abstract: The present invention relates to a tensioning rail for a traction drive, especially for an internal combustion engine, said tensioning rail comprising a fastening end section with a pivotable fastening means and a tensioning arm area having, at a predetermined distance from said pivotable fastening means, a pressure-application region for contact with a tensioning piston of a tensioning device, at least one second pressure-application region being arranged on the tensioning arm area at a predetermined different distance from said pivotable fastening means.

Abstract: In a movable guide for transmission device in which a guide body is formed from a synthetic resin and comprises a chain-contacting shoe and a plate-receiving portion formed as a unit with the shoe on the back side thereof, the plate-receiving portion has plural, longitudinally extending slots, each receiving a reinforcing plate. The plural reinforcing plates improve the bending rigidity, toughness, strength and wear properties of the guide, prevent falling down of the guide and guide torsion, ensure stable travel of the chain, and prevent running of the chain off the guide in a widthwise direction. Improved compactness of the guide and of the overall mechanism, is made possible by the use of plural plates. The plates can be connected to one another by a tensioner-contacting portion, formed as a unit with the plates.

Abstract: A tensioner lever for a chain or belt power transmission comprises a resin shoe having a shoe surface on which the chain or belt slides, and a back surface with a plunger-engaging part adjacent one end and a lever shaft bearing adjacent the other end. A shape-retaining groove extends longitudinally along the shoe through the plunger engaging part and the lever shaft bearing. A part of a strength-maintaining plate is fits in the shape-retaining groove and a part of the strength-maintaining plate is exposed. Simplification and weight reduction in the tensioner lever can be realized, and molding accuracy requirements are reduced. Assembly is simplified by pawls formed in openings in a side wall of the shoe, which cooperate with locking holes in the strength-maintaining plate. The pawls simplify disassembly for recycling and may be notched so that they can be broken away.

Abstract: An engine chain or belt tensioning system includes a tensioner pivot arm with a ratcheting means that includes backlash in an engine timing system. The tensioner system includes a tensioner pivot arm having a fixed pin, ratchet teeth, and a connection for a rotation-causing device, all being spaced radially outward from a pivoting feature. The pivoting feature and the fixed pin are positioned between two strands of a chain. An arm carrying a shoe extended outside the strands of chain and positioned to contact an outside portion of chain is pivotally mounted to the fixed pin. Rotation of the pivot arm causes the arm and shoe to draw inwards, imparting tension to the chain strand. The ratchet teeth allow free rotation of the tensioner arm in one direction, but not the other.

Abstract: In a sliding contact guide for a drive chain or other flexible transmission device, a guide body includes a shoe 102 and a slotted, plate-receiving portion 102 integrally molded on the back of the shoe. A reinforcing plate is inserted into the slot. The guide body has a mounting hole near one end for receiving a mounting shaft. The reinforcing plate, on the other hand, has an arcuate bearing portion which extends only part way around the mounting shaft.

Abstract: In a sliding contact guide for a chain, a guide body is composed of a shoe having a front surface on which the chain slides, and a plate-receiving portion provided on the back of the shoe. The shoe and plate-receiving portion are integrally molded from a synthetic resin. A reinforcing plate is inserted and fitted into a longitudinal slot in the plate-receiving and the sliding contact guide is attached to a frame by a pivot pin which extends through aligned mounting holes in the guide body and the reinforcing plate. Locking pieces formed in the plate-receiving portion, have tapered surfaces on their tips that engage locking holes in the plate and exert a biasing force on edges of the locking holes which urges the plate against the back of the shoe. The reinforcing plate and the guide body are reliably secured together and, even when the guide is vibrated, movement of the reinforcing plate in the slot of the guide body is prevented, so that low noise and long life are attained.

Abstract: A plastic movable guide for a chain or other traveling transmission medium, comprises a guide body composed of a shoe and a slotted plate-receiving portion integrally molded as a unit from a resin, and a reinforcing plate inserted into the slot. A mounting hole adjacent one end of the guide body is aligned with a hole adjacent one end of the reinforcing plate. The diameter of the hole in the reinforcing plate is larger than the diameter of the mounting hole in the guide body, so that the inner periphery of the hole in the reinforcing plate does not extend inward past the edge of the mounting hole. The guide so configured exhibits excellent quietness and assembly efficiency and can be produced at a relatively low cost.

Abstract: A chain guide, such as a fixed chain guide or a tensioner arm, includes a bracket adapted for being secured to an associated engine. The bracket includes a support surface, a leading end and a trailing end spaced from the leading end in a chain movement direction. A guide blade includes a leading end, a trailing end spaced from the leading end in the chain movement direction, a chain guide surface and an inner surface positioned adjacent the support surface of the bracket. The guide blade is selectively movable slidably on the support surface in the chain movement direction and an opposite direction between a first position where the blade is separable from the bracket and a second position where the blade is fixedly secured to the bracket.

Abstract: A device such as a chain tensioner arm and the method of forming the same are provided. The device includes a top wearing member and a bottom structural member, in which the device is produced by forming the top wearing member and the bottom structural member in a single molding cycle.

Abstract: A wear strip easily mountable on an outer surface of a support member or structure of a feeder of an agricultural combine, for preventing wear of the support member and a feeder chain movable thereover. The wear strip includes an elongate body of a molded plastics material having a longitudinal extending side to be positioned in facing relation to the chain and an opposite longitudinally extending mounting side to be mounted on the support member, the mounting side including at least one molded plastics mounting tab extending outwardly therefrom in a position for insertion into at least one hole through the support member, respectively.

Abstract: A blade tensioner of a blade tensioner system for a chain that drivingly connects a drive shaft to a driving shaft in an engine, that improves the chain-damping efficiency in a blade tensioner applied to the chain within an engine, prevents the sideways tilt of the blade tensioner during operation, in a blade tensioner applied to the chain in an engine, and provides a blade tensioner with a functionality that allows it to transversely guide a chain along the chain sliding face in a blade shoe, while maintaining the flexural deformability (i.e., the flexibility) of the blade shoe.

Abstract: A guide for a transmission chain, belt or the like includes a synthetic resin shoe having a sliding surface, a synthetic resin plate portion integrally molded on the back side of the shoe, and a plate which reinforces the guide body fitting into a longitudinal slot in the plate portion. The reinforcing plate is provided with punched windows, open in the direction of the plate thickness, and a through hole, aligned with a guide body mounting hole provided on an end portion of the guide. The total weight of the guide is reduced, and, even if the thermal expansion coefficients of the guide body and reinforcing plate differ, deformation of the guide and breakage of the guide can be prevented.

Abstract: An engine chain or belt tensioning system includes a tensioner pivot arm with a ratcheting means that includes backlash in an engine timing system. The tensioner system includes a tensioner pivot arm having a fixed pin, ratchet teeth, and a connection for a rotation-causing device, all being spaced radially outward from a pivoting feature. The pivoting feature and the fixed pin are positioned between two strands of a chain. An arm carrying a shoe extended outside the strands of chain and positioned to contact an outside portion of chain is pivotally mounted to the fixed pin. Rotation of the pivot arm causes the arm and shoe to draw inwards, imparting tension to the chain strand. The ratchet teeth allow free rotation of the tensioner arm in one direction, but not the other.

Abstract: In a pivoting guide for a traveling transmission chain, composed of a synthetic resin body having a shoe and a slotted reinforcement, and a plate fitting into the slot, the plate has a mounting hole received on a boss formed on the guide body and coaxial with a mounting hole on the guide body which receives a pivot shaft. This structure facilitates assembly and mounting because the plate is securely attached to the guide body before the assembly is mounted. The plate does not contact the pivot shaft, and therefore full advantage is taken of the self-lubricating property of the synthetic resin. The boss may be elongated so that the length of the mounting hole of the guide body is greater than the width of the shoe so that wear in of the guide body due to biased loads is dispersed, and the useful life of the guide is extended.