Abstract: A drive assembly for a two-wheeled vehicle, wherein a closed chain is guided around a drive pinion and a sprocket for output. The chain is formed by pins, on each a bush rotatable about the center longitudinal axis of the pin, a roller provided on each bushing, for rotation around the bushing and has play, and the pins being connected to each other at two opposite ends by means of plates. The outer surface of the bushings and the rollers is coated with pure ta-C, having no further chemical elements except for unavoidable trace elements resulting from production in a PVD method. An Ra roughness between 0.03 ?m and 0.2 ?m and/or an Rz roughness between 0.3 ?m and 2 ?m is adhered to the surface of the coatings. The surfaces of the pinion and the sprocket in contact with the rollers do not have a coating of diamond-like carbon.

Abstract: The invention relates to a roller for a chain which is constructed by a shell roller part and a core roller part, wherein the shell roller part comprises a first outer cylinder, a first inner cylinder which is positioned concentrically inside the first outer cylinder, and a bottom which is positioned at and connected to one end of the first inner cylinder and the first outer cylinder; and wherein the bottom is stretched from the first inner cylinder to the first outer cylinder; wherein the core roller part comprises a second outer cylinder, a second inner cylinder which is positioned concentrically inside the second outer cylinder, and a top which is positioned at and connected to one end of the second inner cylinder and the second outer cylinder; and wherein the top is stretched from the second inner cylinder to the second outer cylinder; wherein the core roller part is positioned concentrically in the space surrounded by the first inner cylinder, the first outer cylinder and the bottom.

Abstract: A bicycle chain is used to transmit the drive force to at least one chain wheel and contains chain rollers and inner and outer plates which are connected to each other by means of pins. As a result of a corresponding shaping of the extremely hard inner plate, the wear on the teeth which cooperate with the inner plate can be reduced on the chain wheels or sprockets.

Abstract: A bicycle chain includes inner link members and outer link member. An inner link having two connecting openings which are formed at a distance from each other, pass through the inner link in the thickness direction thereof and are each designed for receiving a connecting component in order to connect the inner link to a further inner link in order to form an inner link member of a bicycle chain. An outer link member may be formed and attached to the inner link. The inner and/or outer links may be formed with features asymmetric about various orientations of the links.

Abstract: A linear extension and retraction mechanism includes a plurality of first pieces shaped like a plate and coupled bendably with one another by first hinge sections, and a plurality of second pieces C-shaped or hollow square-shaped in transverse section. Each of the first hinge sections is made up of a shaft, columnar in shape, and bearing sections for the shaft, the bearing sections being provided on front and rear ends of each of the first pieces. A flange, non-circular in shape, is provided at a rear end of the shaft. A receiving section shaped as a recess and configured to accommodate a shape of the flange is provided in the bearing section at the front or rear end of the first piece. The flange is fitted in the receiving section.

Abstract: An object of the present invention is to provide a chain and a chain transmission device capable of reducing sliding resistance of the chain to a guide lip portion and stably maintaining an oil film between the guide lip portion and an outer plate. Provided is a chain 20 wherein a plurality of link plates 40 and 60 include outer plates 60, each of the outer plates 60 has a pair of front and rear pin holes 61 into which connecting pins 50 are inserted, a guide-side end surface 62 that faces a traveling guide surface 81a side of a chain guide 80, and a contact convex portion 63 that protrudes from an outer surface of the outer plate 60, and the contact convex portion 63 is formed in an area between the pin holes 61 and the guide-side end surface 62 in a plate height direction.

Abstract: Provided is a chain guide and a chain transmission that can reduce sliding resistance between the chain and guide lips, and can maintain a consistent oil film between the guide lips and outer plates. Guide lips each include a first contact convex portion formed on an upstream end in a chain running direction, and a second contact convex portion formed downstream of the first contact convex portion. The first contact convex portion includes a first peak and a first upstream slope formed upstream of the first peak. The second contact convex portion includes a second peak and a second upstream slope formed upstream of the second peak. The dimension in the chain running direction from an upstream end of a guide rail surface to the first peak is set smaller than a chain pitch.

Abstract: A method of reducing stress concentration in a material subjected to a predominant stress in a direction parallel to an axial plane defined through an axis of a circular cylindrical hole in the material between a first material surface and a second material surface, the material having a material thickness defined between the first material surface and the second material surface, the method comprising: forming a first proximal recess in the first material surface on the axial plane having a depth less than the material thickness, the first proximal recess having an outer edge spaced a first proximal dimension in the axial plane from a first rim of the hole; and forming a second proximal recess in the second material surface on the axial plane having a depth less than the material thickness, the second proximal recess having an outer edge spaced a second proximal dimension in the axial plane from a second rim of the hole, wherein the first proximal dimension on the first material surface is diametrically oppo

Abstract: A bicycle chain having an alternate succession of outer links and inner links connected to each other at respective end portions thereof. Each outer link and inner link comprises two respective plates arranged parallel to and spaced apart from one another to define a housing space for a tooth of a sprocket or toothed wheel. Each plate of each outer link has, at a central portion thereof, a first thickness. Each plate of each inner link has, at a central portion thereof, a second thickness. Each plate of each outer link and inner link has, at said respective end portions, a third thickness that is less than the sum of said first thickness and second thickness.

Abstract: An outer link plate for a bicycle chain is provided. The outer link plate has an interior surface configured to face another counterpart outer link plate in an assembled state and an exterior surface opposite to the interior surface. The outer link plate has an outer perimeter, and first and second end portions including respective first and second openings each having corresponding parallel center axes. An intermediate portion is provided interconnecting the first end portion and the second end portion. The intermediate portion has an axially recessed portion formed along the outer perimeter on the exterior surface, the intermediate portion having a pair of intermediate edges formed along the outer perimeter, the axially recessed portion being formed on at least one of the intermediate edges and including a chamfered portion connecting the at least one of the intermediate edges to the exterior surface of the outer link plate.

Abstract: An escalator has a step belt or moving walkway has a plate belt, wherein the belt includes at least one link chain arranged to circulate between a first deflecting region and a second deflecting region of the escalator or the moving walkway. Guide rollers as well as steps or plates are arranged at the link chain. The link chain additionally includes system rollers. The guide rollers and the system rollers are arranged on at least three tracks lying adjacent to one another with respect to a direction of circulation of the link chain, wherein one of the tracks is occupied by the guide rollers and at least two of the tracks are occupied by the system rollers.

Abstract: The oil recovery system is used to remove oil from water. The system includes rollers rotatably supported on a frame, one of the rollers having drive sprockets. A belt extends between the first and second rollers and a roller press squeezes the belt to thereby remove oil from the belt. The belt has a first layer of oleophilic material, a second layer of oleophilic material and a third central reinforcing scrim layer between the first and second layer. Chains extend along the side edges of the belt, and are driven by the sprockets. The chains are connected to the side edges by a plurality of flanges that are integral the chains, reinforcing cords extending along the side edges, reinforcing strips wrapped around the reinforcing cords and extending along the side edges, and a plurality of pins that extend through the flanges, the strip and the three layers.

Abstract: A bicycle chain comprises a first outer link plate, a first inner link plate, and a first link pin. The first outer link plate comprises a first end portion, a second end portion, and a first intermediate portion. The first end portion includes a first opening having a first center axis. A first outer-link distance is defined from the first center axis to a first end edge. The first inner link plate comprises a third end portion, a fourth end portion, and a second intermediate portion. The third end portion includes a third opening having a third center axis. A first inner-link distance is defined from the third center axis to a third end edge. A second inner-link distance is defined from the third center axis to a third end edge. The first inner-link distance is larger than the second inner-link distance and the first outer-link distance.

Abstract: A bicycle chain comprises a first outer link plate. The first outer link plate comprises a first end portion, a second end portion, and a first intermediate portion. The first end portion, the second end portion and the first intermediate portion defines a first outer peripheral edge. The first outer peripheral edge comprises a first end edge, a second end edge, a pair of first intermediate edges, and a first recessed edge. The first end edge extends about the first end portion. The second end edge extends about the second end portion. The pair of first intermediate edges extends along the first intermediate portion between the first end edge and the second end edge. The first recessed edge is provided between the first end edge and one of the first intermediate edges.

Abstract: A link chain is provided, in particular a drive chain of a combustion engine, with chain links connected one to another by a chain articulation. The inner and outer chain links, which preferably are arranged in alternation, each have at least two link plates arranged in parallel with each other, each with two link openings. One link pin in each case extends through one of the link openings of the link plates to form a chain articulation. In this design, the link plates are made of a boron-manganese steel.

Abstract: A roller chain may include a series of roller links and pin links Each pin link may include composite pin link plates, each having a metallic plate component and a plastic plate component. The metallic plate component may be fixedly mounted on a pair of spaced metallic pin members, and the plastic plate component may be fixedly connected to the metallic plate component and have a pocket formed therein that complementarily receives the metallic plate component.

Abstract: There is provided a wear-resistant chain having a high durability even in severe use environments such as those of a timing chain of an engine even though it is highly efficient and productive. A miniaturizing agent containing silicon is doped in a vanadium cementation process of a base material of steel. Vanadium carbide forming a surface-hardened layer contains a secondary phase composed of an amorphous structure containing silicon within crystal grains and a crystal grain size of the vanadium carbide is miniaturized to 1 ?m or less.

Abstract: Provided are a chain and a connecting pin that enable reduction in the number of components and the workload involved in chain assembly, and that enhances the strength of a connecting pin. A chain 100 has inner plates 110, outer plates 120 and connecting pins 130. Each connecting pin 130 has a pair of outer shaft sections 131 formed on both end sides of the pin and fixed into pin holes 121 of the outer plates 120; a pair of inner shaft sections 132 formed inward of the pair of outer shaft sections 131 in the pin longitudinal direction and freely fitted into pin holes 111 of the inner plates 110; and a movement restricting section 133 formed inward of the left-right pair of inner shaft sections 132 in the pin longitudinal direction and restricting the movement of the inner plates 110 in the chain width inward direction.

Abstract: The invention relates to an engagement chain type driving device including a pair of driving sprockets, which rotate positively and reversely in opposite directions about a pair of rotating shafts, a pair of engagement chains, which engage with each other by the pair of driving sprockets so to be integrated together, and a driving source, which drives the pair of driving sprockets, wherein the engagement chain includes inner tooth plates and outer tooth plates, which each include buckling limiting flat surfaces, the inner tooth plates and outer tooth plates being brought opposite to each other and into contact with each other when the engagement chains are integrated by the pair of driving sprockets, such that the flat surfaces hold the chain engagement position.

Abstract: A bushing including a wall having a generally cylindrical configuration with the first and second ends at the outer surface joined to define a continuous outer diameter and the first and second ends at the inner surface disposed adjacent to define a discontinuous inner diameter and a seam that may extend from the inner surface toward the outer surface to an end point along approximately 40-50% of the thickness of the wall.

Abstract: In a timing chain drive, a hybrid driving sprocket, having roller-engaging teeth and side sprocket teeth, cooperates with a hybrid chain having rollers that mesh with the roller-engaging teeth and toothed link plates that mesh with the side sprocket teeth. A driven sprocket from which the chain travels toward the driving sprocket has a cyclically varying tooth pitch that compensates for tension variations due to cyclic variations in the rotational speed of the driving sprocket or to cyclic variations in the load applied to the driven sprocket. The driven sprocket can be a roller sprocket or a hybrid sprocket having roller-engaging teeth and side sprocket teeth for engagement with the teeth on the link plates of the chain.

Abstract: In a chain transmission using a hybrid chain having inner and outer links with bushings, or with bushings and rollers, the rollers mesh with a central sprocket, and the link plates have teeth that function as a silent chain, meshing with side sprockets fixed to the central sprocket. The teeth of the link plates of the inner links have a shape different from that of the teeth of the link plates of the outer links. The outer flanks of the teeth can all have the same shape, and the shape difference can be in the shapes of the inner flanks.

Abstract: The chain comprises a plurality of external links (2), each defined by a pair of parallel external plates (4, 5) and by two rotation pivots (6) interpositioned between the two external plates (4, 5). The chain also comprises a plurality of internal links (3), each defined by a pair of parallel internal plates (7, 8) and by two bushes (9) interpositioned between the plates and each internal link (3). Each of the rotation pivots (6) is inserted coaxially in a bush (9) and so defines an alternated succession of external links (2) and internal links (3) and defines with the bush (9) a spherical coupling surface. The chain also comprises anti-rotation elements (12) for reducing a possibility of rotation with respect to an alignment direction of each pair of adjacent links (2, 3).

Abstract: A roller chain comprising pins, bushes, rollers, inner fishplates and outer fishplates. Two bushes are connected to each other by at least two inner fishplates and form a chain link. A roller surrounding each bush is mounted rotatably on its respective bush. Adjacent chain links are connected to each other in an articulated manner as a result of each bush being disposed on a pin protruding beyond both ends of the bush, and two pins surrounded by two successive chain links are connected at least by two outer fishplates. At least a part of the bushes comprises a copper alloy. The bushes are produced in a massive forming process.

Abstract: A hoisting and lowering driving engagement multi-row chain is disclosed, in which bending of the connecting pins in the chain is suppressed to avoid fatigue failure. Additionally, the load carrying balance in the chain width direction is improved, and contact vibrations and contact noises generated between the chain and the hoisting and lowering sprockets are suppressed. Endurance of the bush in the chain is thereby improved. Bending of connecting pins is avoided by press-fitting bushes, through which connecting pins pass, into intermediate tooth plates. This also improves load carrying balance widthwise. Contact noises and vibrations between the bushes and sprockets are suppressed by providing bushes with a separate sprocket engagement portion having a larger diameter than the press-fitting portion of the bushes.

Abstract: A bearing roller chain which is sealed by a seal mechanism which prevents entry of foreign substances from the outside and leakage of lubricating oil leakage from the inside to the outside, resulting in an improvement in wear resistance of the bearing roller and avoidance both of rotation failure of the roller and of increased traveling resistance of the chain. A seal mechanism is provided between an inner link plate of a bearing roller chain and a bearing roller assembly carried by the link plate. The bearing roller assembly is formed by a plurality of anti-friction rollers between a hollow roller and a bush. The seal mechanism comprises an inner annular oil seal member, a spacer and a disk-shaped seal member having a flange extended toward an outer side surface of the hollow roller loosely into an outer circumferential concave groove on an end surface of the hollow roller. The disk-shaped seal member slidably comes into close contact with the inner link plate and the spacer, respectively.

Abstract: An outer chain plate is configured to aid in downshifting such that a chain moves more smoothly from an outer chain ring (sprocket) to an inner chain ring (sprocket) with either no downshifting recess being provided on the outer chain ring or at least a shallower than normal downshifting recess being provided on the outer chain ring. At least a bottom part of the outer chain plate that faces a center axis of a sprocket when in use has a portion removed to minimize contact with outer chain ring when downshifting. Preferably, the bottom part of the outer chain plate has a chamfered outer edge portion along a cutout portion that defines a reduced area portion.

Abstract: A bicycle chain connecting link basically has a first link plate, a second link plate, a first link pin and a second link pin. The first link plate has a longitudinal slot. The second link plate has a pair of pin attachment openings. The first and second link pins each have a first pin end retained to the first link plate and a second pin end releasably coupled in the pin attachment openings of the second link plate to be separated from the second link plate and reattached to the second link plate. At least one of the first pin ends of the first and second link pins is slidable within the longitudinal slot of the first link plate in a longitudinal direction of the longitudinal slot of the first link plate.

Abstract: An oil-free chain has bushings which protrude from the outer surfaces of the inner link plates into which they are press-fit, and extend into bushing supporting bores formed in the inner surfaces of the outer link plates of the chain. These bushing supporting bores are formed by a pressing operation which produces offsets in portions of the outer plate, so that, as the bushing supporting bores are formed in the inner surfaces of the outer plates, bosses are simultaneously formed on the outer surfaces. The connecting pins of the chain are press-fit into pin holes in these bosses. The bushing supporting bores are formed without removal of material by machining, and therefore the strength of the outer plates is not compromised.

Abstract: A device for inserting an articulation pin (28) to pivotally connect the outer plates (12) and the inner plates (14) of a chain, particularly a bicycle chain. The device comprises an articulation pin (28) and a guide element (30) which is to be separated from the pin (28) after the insertion of the pin (28) within aligned holes (16, 18) of the plates (12, 14). The pin (28) is provided at one end thereof with a snap engaging portion (38) shaped so as to expand the holes (16) of the outer plates (12) in a radial direction during the insertion of the pin.

Abstract: In a seal chain having ring-shaped seals sealed between outer plates and inner plates, by reducing the thickness of the outer plates and the inner plates, a distance between inner side surfaces of the both inner plates and a distance between outer side surfaces of the both outer plates are set to be same as those of a standard chain, and the length of pins is set to be same as that of the standard chain, so that a narrow seal chain in which a standard guide can be used, and a standard attachment can be attached is achieved.

Abstract: A method of manufacturing a link plate for a roller chain, and the resulting link plate in which (1) the link plate has a shape comprising a pair of right and left pin holes, a pair of right and left half arcs, which are spaced outwardly from the pin holes respectively, and a pair of upper and lower straight line portions connecting both ends of the pair of right and left half arcs. There are shaved lengths along the pair of upper and lower straight line portions extending into the half arcs, the shaved length extending between the outermost positions of both ends of said pin holes.

Abstract: In a roller chain or a rollerless bushing chain, each outer link plate is a gourd-shaped plate having, along the direction of elongation of the chain, a narrow middle portion between two end portions larger than the middle portion. The back height of each outer link plate, is smaller than the back height of each of the inner link plates. The area of each cross-section of each outer link plate, on a section plane perpendicular to the direction of chain elongation and passing through the center of a connecting pin, is at least as large as the area of each cross-section of each inner link plate taken on a section plane perpendicular to the direction of chain elongation and passing through the center of a bushing.

Abstract: A chain includes a plurality of inner links in which adjacent two are connected by an outer link. The inner link includes at least one first bushing mounted between the two inner plates and at least one roller mounted in the inner link, outer link and first bushing. The roller includes an engaging section which extends on its outer periphery thereof and in a curved shape with a uniform radial distance with respect to a center thereof. The first bushing includes a retaining section in which the engaging section of the roller moveably fits, and the first bushing and roller includes a gap defined therebetween so that the outer link is able to tilt together relative to the inner link.

Abstract: The outer link plates of a roller chain or rollerless bushing chain have one or more curved grooves formed by pressing, on their inner faces. The grooves connecting one of two pin holes formed in each plate to the other pin hole.

Abstract: A chain and a chain and sprocket assembly for a roller, bush, or inverted tooth chain is disclosed. The chain has at least two types of link plates having different profiles, with at least one type of link plate having a leading corner for interaction with a contact ring on the sprocket, thereby reducing noise by reducing chordal action and by breaking up the regular timing of roller-sprocket (or bushing-sprocket) and link plate-sprocket impact. A method of reducing noise in a chain and sprocket assembly is also disclosed.

Abstract: The plates of transmission chain for an engine are formed with a guide-contacting configuration composed of spaced flat surfaces that come into sliding contact with a flat chain guide, and convex surfaces, continuous with and between the flat surfaces, for sliding contact with a convex chain guide. The convex surfaces are connected by a concave surface that, with the guide surface, forms an oil-retaining clearance. The radius of curvature of the convex curved surfaces of the plate preferably increases gradually from the location where they meet the flat surfaces toward the location where they meet the concave surface. The plates can have the same configuration on the side facing the inside of chain loop as on the side facing the outside of the chain loop.

Abstract: A flexible bicycle chain comprises a plurality of chain unit, each chain unit including: two inner chain plates; each inner chain plate having a shape like an “8”, two outer chain plates; each outer chain plate having a shape like an “8”, a size of each outer hole of the outer chain plate being smaller than that of each inner hole of each outer chain plate; a roller unit having a receiving space; a connecting pin received in the receiving space of the roller unit; the connecting pin being longer that the roller unit. Each roller unit includes a middle annular groove, two inclined annular surfaces; the middle annular groove is at a middle section of the roller unit and has a concave cambered shape; and the two inclined annular surfaces are at two ends of the middle annular groove.

Abstract: A bicycle chain connecting pin comprises a pin body dimensioned to fit within an opening in a link plate of a bicycle chain, wherein the pin body has an intermediate part and first and second ends. At least one of the first and second ends has a corresponding first or second recess defining a floor that faces in a longitudinal direction of the pin away from the pin. The floor has a floor diameter of from approximately 60% to approximately 90% of an outer diameter of the intermediate part.

Abstract: The invention concerns a chain for a chain transmission with chain links coupled by a parellel chain pins, each chain link having at least one link plate, the chain pins forming pivot axes for the link plates at a pitch distance whereby a chain link axis perpendicularly intersects the two pivot axes, said link plates having towards at least one end side of the link plate a cam surface for supporting the link plate on a cylindrical support surfaces of a sprocket wheel with a pitch angle. In accordance with the invention the cam surface ends in a convex curved plane with near the end side an increasing slope angle with the link axis whereby the slppe angle increases to at least half of the pitch angle or to at least seven degrees.

Abstract: A cylindrical roller-incorporated roller chain, which can reduce wear of the side plates and also can reduce radial wear. A roller chain for a conveyor in which a plurality of cylindrical rollers are composed of either a casehardened steel cylindrical roller 4 or an oil-impregnated sintered alloy cylindrical roller 5. The casehardened steel cylindrical rollers 4 and the oil-impregnated sintered alloy cylindrical rollers 5 are alternately disposed in a circumferential direction. A pair of side plates 6, 6 are each composed of an oil-impregnated sintered alloy having a collar portion 6a and a cylindrical portion 6b. One axial end surface of each collar portion 6a abuts on an end surface of the hollow roller 3 (having no collar), and each cylindrical portion 6b is fitted between the inner circumferential surface of the roller 3 and the outer circumferential surface of the bushing 2.

Abstract: A roller chain for bicycles having outer and inner chain links. The outer and inner chain links have outer and inner link plates, respectively. The chain links are joined by tubular pins. The chain links have holes for receiving the tubular pins. The holes have an outward-opening conical contour for receiving a deformed head of the pin. The roller chain is assembled into a working unit by using a closing link to join two inner chain links. The closing link can be assembled and dismantled without plastic deformation or press-fitting forces on the closing link. The configuration of the hole contour and deformed heads allows the outer link plates to enter into a connection with the pins such that a slight movement of the pin in its seat in the hole in the outer link plate.

Abstract: A Continuously Variable Transmission (CVT) for use in applications where a transmission is desired to change the speed of the motor relative to the speed of the final drive. The CVT has a set of chains or belts that are mounted around a set of pins set in radially cut slots of a set of spindles so that the pattern of pins are able to expand and contract radially around the CVT axis via these slots. Sprockets that freely spin in either direction unless a chain or belt has fully seated on at least one tooth are arranged on the pins so that only one sprocket engages one chain or belt allowing for smooth ratio changes while the load in engaged. The spindles share a set of springs that act to return the transmission to a higher ratio at moments the load is overcome.

Abstract: In an oil-free roller chain rollerless bushing, bushing protrude outward past the inner link plates and are received in supporting bores formed in the inner faces of the outer link plates, the bores being coaxial with the holes in which the connecting pins of the chain are press-fit. The relationship between the protruding parts of the bushings and the supporting bores establishes a labyrinth that resists leakage of lubricating oil from the space between the pin and the interior of the bushing. The mutually facing overlapping faces of the plates of the chain are have roughened surfaces that also form a labyrinth structure that further resists oil leakage. A groove formed in the connecting pin allows for an increased supply of sealed lubricating oil.

Abstract: An investment cast, stainless steel chain link is provided for chains used in water and wastewater treatment. The chain link comprises a pair of spaced apart, elongated sidebars having forward ends and rearward ends. The forward ends are spread apart and are provided with outwardly and laterally extending bosses having transverse boss pin bores coaxially aligned with each other. The rearward ends are interconnected by a cylindrical barrel having a barrel pin bore extending through each of the sidebars. The sidebars are formed with outwardly and laterally projecting reinforcing ribs-extending between the bosses and the barrel pin bore along a substantial length of the sidebars. A freely rotatable chain pin is inserted through aligned boss and barrel pin bores from either end thereof for interconnecting first and second pairs of sidebars. An arrangement is provided for preventing the lateral dislodgement of the chain pin from the sidebars.

Abstract: A bicycle chain has an outer link with two outer link plates, an inner link formed with two inner link plates and a link pin connecting adjacent ones of the together. The link plates are configured to aid in smoothly shifting a chain moves between sprockets. The outer link plates have the outer link peripheral edges that are shaped differently. One of the outer link plates has an exteriorly facing surface with a first chamfered outer edge portion extending along a section of its outer link peripheral edge at a first end portion and a first reduced area part having a reduced radial dimension with respect to a radial dimension of the first end portion lying along a longitudinal axis. The inner link plates have center connecting portions with different minimum widths.

Abstract: In a roller chain transmission, the chain has rollers which are tapered from a central region toward their ends, and the teeth of the sprockets in driving and driven relationship with the chain have concave surfaces that contact the tapered parts of the rollers on both sides of a central region. However, there is no contact between the rollers and the sprockets in the central region. The central regions of the rollers can be provided with compressible external resin rings that cushion the impact on engagement of a roller with a sprocket tooth.

Abstract: A corrosion resistant roller chain which exhibits protection against corrosion for a long period of time under corrosive conditions such as saltwater, acid, alkali or the like comprises outer plates 110 and inner plates 130 which comprise a zinc-aluminum system alloy coating which is thinner than required by JIS and a chemical conversion coating which covers the zinc-aluminum system alloy coating.

Abstract: In a roller chain transmission, the diameter D of the rollers, the outer diameter d of the pins and height H of the inner plates satisfy the relationships 0.72P?D?0.79P, 0.40P?d?0.44P, and 0.96P?H, with respect to the chain pitch P. The sprocket teeth are asymmetric in that the chain entering side and the chain leaving side differ, and the radius R1 of an arc of the tooth gap bottom, the radius R2 of the chain entering side tooth flank and the radius R3 of the chain entering side tooth head portion satisfy the relationships 0.505D?R1?0.505D+0.069D, P?(0.505D+0.069D)?R2?P?0.505D, and 0.08?R3?0.13P. The transmission chain exhibits improved endurance and quietness, smooth operation, and resistance to elongation due to wear.

Abstract: A bicycle chain includes a plurality pairs of outer plates and inner plates. Each pair of the outer plates is connected at two opposite ends to two pairs of the inner plates by connectors connected to the inner plates. Each connector has a rivet extending therethrough and two ends of the rivet are respectively connected to the two opposite ends of the outer plates. Each rivet has a protrusion extending radially outward from the outer periphery thereof and the protrusion is in contact with an inner periphery of a central passage of the connector corresponding thereto. There is a gap defined between the rivet and the inner periphery of the central passage so that the chain has more flexibility.