Abstract: A plastic movable guide for a belt or chain transmission has a plunger-engaging portion for contact with the plunger of a tensioner at a location remote from its pivot axis. A reinforcing plate is located in a slot in a resin guide body, and is slightly recessed at the location of the plunger-engaging portion so that it does not protrude from the slot opening and is not contacted by the plunger of the tensioner. Superior quietness of operation, ease of assembly, and reduction of production cost are achieved.

Abstract: A guide for a chain, or similar endless, flexible, power transmission device, is composed of a molded guide body, and a reinforcing plate fitting into a slot in the guide body. A nearly circular, but slightly elongated, mounting hole in the guide body is elongated in the front-to-back direction of the guide. The elongated mounting hole overlaps a circular mounting hole in the reinforcing plate, and allows relative adjustment of the positions of the holes so that the guide can be more easily mounted on an inner wall of an engine by a bolt or pin which extends through both mounting holes.

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 movable lever for a transmission chain, which is able to pivot smoothly, and avoid seizing on its supporting shaft, comprises a unitary, molded resin lever body composed of a chain-engaging shoe and a plate-receiving portion, and a reinforcing plate in a slot in the plate-receiving portion. The plate and the plate-receiving portion have coaxial, cofastening mounting holes which receive the mounting shaft. Reinforcing ribs are provided on a side of the plate-receiving portion and their ends are notched to provide grooves which promote the flow of oil, which accumulates on the lever, toward the mounting holes so that adequate lubrication of the mounting hole in the plate is achieved.

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: A bicycle includes a conventional pedal crank and chain drive together with a conventional derailleur shifting mechanism operative to selectively transfer the drive chain between alternative rear sprockets of the bicycle drive system. A chain ring is rotatable in response to pedal crank rotation to transfer pedal crank power to the rear sprockets. A pair of guide blocks define respective internal guide channels through which the drive chain passes toward and from engagement with the chain ring. The guide blocks are maintained at their respective positions by a guide support plate secured to the bicycle frame.

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.

Abstract: A blade-type tensioner for chain drives which is suitable for use as a tensioner on the timing chain of a motor vehicle engine. The present invention is a chain tensioner particularly suited for use in confined spaces having a blade spring element mechanically interlocked with a plastic shoe. The shoe may be of rigid filled nylon and engages the chain to be tensioned. The spring element is interlocked to the plastic shoe by having ends inserted into grooves formed in the opposite ends of the shoe. The shoe has a metal bushing fixed in one end. The shoe is rotatably attached to a metal pin inserted through the bushing, the pin being fixed to a base.

Abstract: To improve a mounting configuration for a chain guide of a cam chain for transmitting power to a power system of an internal combustion engine to make mounting of a chain guide and a cylinder block simple and easy. A mounting device for a cam chain guide for an internal combustion engines constructed such that rotation of a crank shaft is transmitted to a cam shaft provided externally of a cylinder bore by a cam chain 3 to operate an intake/exhaust valve through a push rod and a rocker arm. A first protrusion provided in the vicinity of a lower end of a chain guide is fitted into a first locating groove provided in the vicinity of a crank shaft of a crank casing, and a second protrusion provided in the vicinity of an upper end of a chain guide is fitted into a second locating groove provided in a lower surface of a cylinder block and gradually enlarged from a protrusion fixed position toward an opening.

Abstract: A blade tensioner of s 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 device such as a chain or belt, is injection molded using a sandwich-molding process. The process avoids the need for a complex mold and complex manufacturing steps. The guide exhibits enhanced mechanical strength and excellent sliding contact properties and wear resistance in a compatible manner, and is also light in weight and has excellent durability. The sandwich-molded guide comprises a slide rail on which a chain or belt slides, and a rail supporting member integrally provided along with the slide rail. The slide rail is composed of a material the principal component of which is a first polymeric material having wear resistance and heat resistance, and the rail supporting member is composed of a material the principal component of which is a second polymeric material having higher strength than the material having the first polymeric material as its principal component.

Abstract: A tensioning device for a chain (1) comprising a housing (3), said housing (3) carries a first sliding shoe (6) for contact with a first side (7) of the chain (1) with the tensioning device further comprising a tensioning piston (5,23) that is guided on the housing (3) and comprises a second sliding shoe (8,24) for contact with a second side (9) of the chain (1) whereby in an economic and simple-to-manufacture tensioning device, the housing (3) and the first sliding shoe (6) are made in one piece with each other.

Abstract: A tensioning device for a chain (1) comprising a housing (3), said housing (3) carries a first sliding shoe (6) for contact with a first side (7) of the chain (1) with the tensioning device further comprising a tensioning piston (5,23) that is guided on the housing (3) and comprises a second sliding shoe (8,24) for contact with a second side (9) of the chain (1) whereby in an economic and simple-to-manufacture tensioning device, the housing (3) and the first sliding shoe (6) are made in one piece with each other.

Abstract: An engine tensioning system including tensioner arms and a rotary actuating tensioner capable of driving multiple tensioner arms making multiple chain or belt contacts. The rotary actuating tensioner has connector pins fixed to a rotating surface to which tensioner arms are attached. Rotation of this surface is accomplished through a combination of springs and hydraulic pressure. When the surface rotates, the attached tensioner arms are driven laterally against the engine chain or belt, keeping it taut.

Abstract: A blade tensioner is configured with a blade shoe provided with a chain sliding face, several plate-spring-like blade springs stacked on the reverse side of the chain sliding face of the blade shoe in order to apply a spring force to the blade shoe, and friction plates provided respectively between adjoining blade springs to increase the dampening of the blade tensioner.

Abstract: A plastic movable guide is disclosed wherein a reinforcing plate for reinforcing a guide body is simplified in shape, permitting easy assembly and prevention of disengagement. The movable guide is constituted by a guide body and a reinforcing plate fitted into the guide body. The guide body is made up of a shoe, a vertical plate, a flange, and a boss. The vertical plate has a slit which opens in an end portion on a flange side of the vertical plate. The reinforcing plate is fitted into the slit. A pair of windows are formed in the vertical plate and tongue pieces extending in the fitted direction of the reinforcing plate are formed in the windows respectively. The tongue pieces each comprises a base end portion having the same thickness as the vertical plate and a retaining portion formed on a front end side. The retaining portion has an expanded face for advance into the slit and a truncated face which is contiguous to the expanded face.

Abstract: A pivot shaft member is disclosed which can be mounted to a fixed frame such as a frame of a drive unit in a positive and simple manner while correcting a positional deviation, if any, between mounting holes through which the pivot shaft member is inserted, the mounting holes being formed respectively in a lower side wall of a guide body of a slide contact guide for a transmission device as assembled and in a reinforcing plate. The pivot shaft member is provided with a tapered, truncated cone-like guide inserting portion and a cylindrical support portion, the tapered, truncated cone-like guide inserting portion being inserted into the mounting holes while correcting a positional deviation between the mounting holes at the time of mounting the guide to a fixed frame, the cylindrical guide support portion being contiguous to the truncated cone-like guide inserting portion and onto which inner peripheral surfaces of the mounting holes are flushly fitted and supported after the mounting of the guide.

Abstract: A cam drive assembly for an automotive engine comprises a crankshaft sprocket mounted for rotation with a crankshaft, a camshaft sprocket mounted for rotation with a camshaft, and a chain rotatably operable between the crankshaft sprocket and the camshaft sprocket. A chain tensioner provides tension to the chain and is supported only by an engine block side wall. The chain tensioner is comprised of a stationary portion and a flexible spring portion supported thereto, and a nylon shoe fixed to the flexible spring portion to provide a contact surface for the chain. The stationary portion has a geometrical interlocking feature to mate with a complementary geometric feature in the engine block side wall to restrict upper and lower movement of the chain tensioner. The geometrical interlocking feature of the chain tensioner may be a concave retention portion, which fits over a complementary convex nub in the engine block side wall to restrict movement of the chain tensioner by part interference.

Abstract: A blade tensioner includes a blade shoe having a chain slide face, a plurality of blade springs for applying spring force to the blade shoe, and a spacer member interposed between the adjacent blade springs. Each of the blade springs is in the shape of a leaf spring. The blade springs are positioned and layered on the opposite side of the blade shoe from the chain slide face. The spacer member preferably contacts the corresponding blade spring at two contact points apart from each other at a uniform distance. In the blade tensioner of this invention, the blade spring contacts the spacer member at a constant span, which causes the damping coefficient of the whole blade spring to be constant and also causes the damping performance of the blade tensioner to be stable.

Abstract: A blade-type chain tensioner includes a blade shoe having a chain sliding face, a blade spring biasing the blade shoe toward an associated chain, and a bracket to rotatably support the fixed end of the blade shoe. The length of the blade spring is shorter than that of the chain sliding face of the blade shoe. The first end of the blade spring is attached onto the fixed end of the blade shoe and slidably contacts the distal end of the bracket at a contact point located between the fixed and free ends of the shoe.

Abstract: According to an embodiment of the invention, blade tensioner is configured with blade shoe having chain sliding face, base that supports base part of blade shoe while allowing it to pivot freely, and blade spring in which base part is fixed to tip part of blade shoe. Warped part provided at the tip contacts inner face of blade shoe, and curved part provided at the midpoint of base contacts sliding face of base. In this case, the damping force of the blade tensioner increases due to sliding resistance generated between warped part of blade spring and inner face and between curved part and sliding face.

Abstract: A blade tensioner which imparts tension to a chain includes a blade shoe with an arcuately curved chain sliding face and small strip-shaped guide pieces upraised from side edges of the chain sliding face in numerous places following the chain sliding face. The blade tensioner also includes a leaf spring-shaped blade spring disposed on the opposite side of the blade shoe from the chain sliding face which applies spring force to the blade shoe. The two guide pieces in a pair of guide pieces are preferably disposed opposite each other on the right side edge and left side edge of the chain sliding face, respectively. Alternatively, the guide pieces are not in pairs. Instead, the guide pieces are disposed alternately on the right and left side edges of the chain sliding face. Consequently, the blade shoe preferably has either a nearly U-shaped cross section or a nearly L-shaped cross section where the guide pieces are formed.

Abstract: A blade tensioner includes a blade shoe having a chain sliding face and a plurality of blade springs disposed and stacked at the opposite side to the chain sliding face. A clip is provided on the blade springs. The clip includes a clip body encompassing the blade springs, which elastically contacts the blade springs, and an engaging portion integrally formed with the clip body. The engaging portion includes an engagement hole to engage a tool.

Abstract: A tensioner lever for chain drives has an internal space formed therein for accommodating within it at least a coiled portion of a torsion coil spring. The internal space has an opening for enabling the torsion coil spring to be assembled in the internal space. The lever body further has a boss disposed inside the internal space. The boss has an axial hole through which a pivot shaft extends and an outer peripheral surface around which the coiled portion of the torsion coil spring is loosely fitted, the axial hole and the outer peripheral surface being concentric with each other. The tensioner lever of the foregoing construction requires only a small space for installation to a mount surface and can be easily and speedily assembled onto the mount surface.

Abstract: A guide for a power transmission device includes a one-piece guide body molded of synthetic resin having a longitudinal groove extending in a carrier along the length thereof and opening to a longitudinal edge of the carrier facing away from a shoe surface, and a reinforcement plate fitted in the longitudinal groove of the guide body and having a through-hole at one end thereof, the through-hole being alined with a mount hole formed in the carrier of the guide body.

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 chain drive is provided which includes a chain, a driven sprocket and a drive sprocket. A single portion of the chain is tensioned by two spring tensioners. The spring tensioners can act on a single side of the chain portion or on opposite sides of the chain portion.

Abstract: A chain tensioner apparatus includes a mounting bracket adapted for connection to an associated engine block. The mounting bracket defines a pivot point and a support surface. A blade is connected to the bracket and includes: (i) first and second opposite end portions joined together by a central portion; (ii) a hub defined by the first end portion; and, (iii) a first end wall connecting the hub to the central portion. The hub of the blade is pivotably connected to the bracket at the pivot point and the second end of the blade abuts the support surface. The blade defines an exterior chain guide surface adapted for slidingly abutting an associated chain of an associated chain drive system. The chain tensioner apparatus further includes a tensioning spring connected to the blade, the spring having opposite first and second ends located respectively adjacent the first and second opposite end portions of the blade. The spring contacts and exerts a biasing force on the central portion of the blade.

Abstract: A fastenerless chain snubber is provided that consists of a snubber body, and one or more attachment arms that form positioning blocks. The snubber is positioned in a housing by channel surfaces in the chain housing that locate the positioning blocks of the snubber. The snubber is firmly secured during chain operation by the substantial contact between the snubber attachment arm surfaces opposite the chain cover and the corresponding surface of the installed chain cover.

Abstract: A chain tensioner blade having a supporting bracket and a blade shoe supported on the bracket is described, wherein a resiliently deformable intermediate layer is provided between the bracket and the shoe. The intermediate layer is preferably rubber, and allows the shoe to conform to the curvature of the chain. The contact stiffness between the chain and the tensioner blade is thereby reduced, resulting in a more even distribution of chain load, and enhanced wear and noise properties.

Abstract: A blade-type tensioner for chain drives which is suitable for use as a tensioner of the timing chain of a motor vehicle engine. The present invention is a chain tensioner particularly suited for use in confined spaces having a blade spring element mechanically interlocked with a plastic shoe. The shoe may be of rigid filled nylon and engages the chain to be tensioned. The spring element is interlocked to the plastic shoe by having ends inserted into grooves formed in the opposite ends of the shoe. The shoe is rotatably fixed to a base by way of a pin. The groove at the fixed end of the shoe extends towards the tip of the fixed end of the shoe past the pin attachment point. The groove at the free end of the shoe extends toward the tip of the free end of the shoe past the point at which the free end of the shoe bears upon a sliding surface formed on the base.

Abstract: An engine tensioning system including a pivoting tensioner arm used to simultaneously tension two separate strands of the same chain in an engine timing system. The tensioner arm includes an body with essentially an “I” shape with upper and lower extending legs with attached shoes. In the center of the body a pivot bore and pivot pin allows the body to rotate. At least one pair of shoes are attached to the body by way of tabs extending in a perpendicular direction from the legs. The body rotates causing the shoes to contact and impart tension to the separate strands of the chain simultaneously and act to dampen vibrations in one strand of chain by transferring the energy through the body to the other shoe and strand.

Abstract: A bicycle includes a conventional pedal crank and chain drive together with a conventional derailleur shifting mechanism operative to selectively transfer the drive chain between alternative rear sprockets of the bicycle drive system. A chain ring is rotatable in response to pedal crank rotation to transfer pedal crank power to the rear sprockets. A pair of guide blocks define respective internal guide channels through which the drive chain passes toward and from engagement with the chain ring. The guide blocks are maintained at their respective positions by a guide support plate secured to the bicycle frame.

Abstract: A chain tensioner apparatus and a method for mounting the chain tensioner apparatus to an engine component is disclosed. The chain tensioner apparatus includes a bracket having a first surface and a second surface, and a pivot pin secured to the bracket. The pivot pin includes a first portion extending from the first surface and a second portion extending from the second surface. A shoe sub-assembly is pivotally mounted to the pivot pin first portion. The method includes the steps of inserting the pivot pin second portion into a bore associated with the engine component, and securing the bracket to the engine component with a fastener.

Abstract: A chain guide member used in a chain transmission apparatus, and manufacturing method and apparatus thereof. The chain guide member has a sliding contact section extending along a traveling surface of a chain and coming into sliding contact with the chain, and a reinforcement main body reinforcing and supporting the sliding contact section along the traveling surface of the chain. A part or all of a joint portion between the sliding contact section and the reinforcement main body is joined by melting.

Abstract: A chain drive is used for driving camshafts, secondary shafts or the like, from a crankshaft, in an internal combustion engine. A tensioner blade and a sliding blade rest against the loose end and against the load end of a chain of the chain drive. For compensating component tolerances, the sliding blade and the tensioner blade are each disposed in an articulated manner at a proximal end via a bolt. An adjusting device is applied to a distal end of each of the sliding blade and the tensioner blade, respectively.

Abstract: To improve a mounting configuration for a chain guide of a cam chain for transmitting power to a power system of an internal combustion engine to make mounting of a chain guide and a cylinder block simple and easy. A mounting device for a cam chain guide for an internal combustion engine is constructed such that rotation of a crank shaft is transmitted to a cam shaft provided externally of a cylinder bore by a cam chain 3 to operate an intake/exhaust valve through a push rod and a rocker arm. A first protrusion provided in the vicinity of a lower end of a chain guide is fitted into a first locating groove provided in the vicinity of a crank shaft of a crank casing, and a second protrusion provided in the vicinity of a lower end of a chain guide is fitted into a second locating groove provided in a lower surface of a cylinder block and gradually enlarged from a protrusion fixed position toward an opening.

Abstract: A movable backup bar assembly includes an endless drive chain, a sprocket or the like for coupling the drive chain to the power source, and a backup bar for guiding the drive chain. The assembly has two positions: a first position for holding the drive chain in engagement with the chain to be driven and a second position for holding the drive chain away from the driven chain. An actuator is provided for positively shifting the assembly between these two positions.

Abstract: A chain guide includes an angle-like guide base having a single mounting portion bolted to a mount surface on the interior side of an endless chain and projecting to the exterior side of the chain through a space defined between the chain and the mount surface. A shoe supporting portion of the angle guide base projects perpendicularly from an exteriorly projecting end of the mounting portion and is provided with a plurality of nose locking projections spaced in a direction of travel of the chain. A guide shoe is provided with a plurality of generally hook-shaped resilient locking prongs projecting from a rear surface on a side opposite to a shoe surface. The locking prongs are snap-fitted with the locking projections to attach the guide shoe to the guide base with the shoe supporting portion held between the rear surface of the guide shoe and the locking prongs. The angle guide base is highly rigid and hence is able to suppress vibration and noises generated while the chain is running.

Abstract: A tensioner has a substantially U-shaped stopper pin hooked at opposite end parts on a tensioner body and part of a plunger, respectively, to keep the plunger in a retracted position against the force of a spring before the tensioner is mounted to an engine body at an appropriate position relative to a power transmitting chain.

Abstract: A chain guide for guiding a chain includes an elongated chain guide body pivotally connected at one end to a fixed support member and having an aperture formed in an opposite end of the chain guide body, and a collar loosely fitted in the aperture in such a manner that a clearance is defined between the chain guide body and the collar at least on that side of the collar which is aligned with a direction of pivotal movement of the chain guide body. The collar is firmly secured to the fixed support member so that the chain guide body is allowed to pivot within the range of the clearance. With the clearance thus provided, the chain is protected against excessive tightening or loosening which may otherwise occur when the chain guide is mounted on the fixed support member.

Abstract: A variable speed drive comprising two drives, an output drive wheel and an endless, extendible member that is driven by the drives and extends around and rotates the output drive wheel. The drives are operable to move the endless member around an endless path at a first speed at a first driving position and at a second speed at a second position. This causes local expansion or contraction of the endless member around the output drive wheel and so varies its speed.

Abstract: A guide or tensioner arm including a bracket made from a formed sheet metal stamping. The bracket is formed of a body portion with a series of tabs formed along a bottom edge. The tabs are bent perpendicular to the body portion of the bracket in an alternating fashion. This forms a bracket having a T-shape providing a flat base for mounting a plastic shoe. Since the body portion is centered with respect to the alternating tabs a strong bracket for holding the plastic shoe is provided to guide or tension an associated strand of chain in a power transmission system.

Abstract: To effectively reduce noise caused by an attachment part of a cam chain guide without increasing a pressing force of a cam chain tensioner more than is necessary. A cam chain guide for slidably guiding a cam chain at a valve gear of a four cycle engine is made of resin. An attachment hole for an attachment bolt is provided at an attachment end section for the crankcase. Side surface projections are provided equally spaced at the periphery of an attachment surface surrounding the attachment hole so as to project from a normal surface. Annular recesses are formed at the peripheries of each of the side surface projections. Furthermore, inner surface projections are provided at the inner peripheral surface of the attachment hole equally spaced about the periphery so as to project in a central direction.

Abstract: A chain tensioner assembly including a blade spring in interlocked association with a plastic shoe. The shoe includes slots at one end and a protruding portion and cylindrical hollow sleeve located at the other end to securely hold the blade spring thereagainst. The assembled shoe and blade spring is pivotally mounted to a bracket. The bracket has a tab with a notch in alignment with the hollow sleeve. A removable retaining pin engages the notch in the bracket and passes through the hollow sleeve to secure the tensioner to the bracket in a retracted state for shipping and subsequent application to an engine.

Abstract: A chain saw comprises interconnected center links and side links. The side links include front and rear heels having front and bottom contact surfaces, respectively, which slidably engage an edge rail of a chain saw guide bar. The bottom contact surface of at least one of the heels includes a recess formed therein. The recess has an open front end and a closed rear end. The recess is of less width than a width of the respective bottom contact surface, whereby portions of the contact surface straddle the recess. The depth and width of the recess gradually decrease from the front end toward the rear end. During a cutting operation, lubricant enters the recess and creates a pressure which lifts the heel slightly off the rail, eliminating metal to metal contact.

Abstract: In a link plate for use in a power transmission chain driven to run while a side edge of the link plate is in sliding contact with a shoe surface a chain guide member, the side edge of the link plate has a pair of contact portions near opposite longitudinal ends thereof for sliding contact with the shoe surface, and a recessed central portion extending between the contact portions. The recessed central portion together with the shoe surface forms a space which is capable of collecting and holding lubricating oil when the contact portions are in sliding contact with the shoe surface. As the link plate slides on the shoe surface, the lubricating oil trapped inside the space gradually enters between the contact portions and the shoe surface to thereby form an oil film. With this oil film, friction between the link plate and the shoe surface is reduced, leading to reduction of running resistance of the power transmission chain.

Abstract: A combine chain and slat crop conveyor includes a plurality of feed drum chain guides. Each chain guide is a generally cylindrical ring which encircles and is attached to the conveyor feed drum and is shaped as a “W” in cross section. Each chain guide includes two outer flanges which extend away from the feed drum surface at an angle, e.g. in a range from 20 to 70 degrees from parallel with the drum surface. The angled outer flanges insure that, as a chain starts to wander out of its path, it will get tighter, which forces it back toward the center of the guide ring. Each guide ring also has an elevated center portion which directly contacts the chain rollers, thus providing a rolling surface for the chain rollers, which puts all relative rolling motion and metal to metal contact between chain roller and roller pin.

Abstract: A chain tensioner system having a hydraulic tensioner and a tensioner arm with a spring blade. A hydraulic tensioner applies force against the end of the tensioner arm. The arm is pivotally supported at one end and supported by the tensioner piston at the other end. A blade spring into inserted into the plastic shoe to provide tension to the arm.

Abstract: To provide a pivotal structure of an oscillating member facilitating management of parts and fixing work. The cylindrical peripheral face (11A) of a collar (11), which is fixedly secured by screwing a bolt (4) being inserted in a bolt insertion hole (11C ) into a tapped hole (13) in a fixed part (12), is rotatably fitted in a bearing hole (9) bored in a pivot guide portion (6) provided on the side of the pivotal support end of an oscillating member and, by means of collar movement restricting faces (8A, 10A) at the pivot guide portion (6), the cylindrical peripheral face (11A) is prevented from coming off the bearing hole (9). Since, the collar (11) is previously incorporated in the pivot guide portion (6) before the oscillating member is secured to the fixed part (12) and such assemblies can be arranged as a set of parts, management of parts and fixing work are made easier.