Abstract: In a silent chain comprising guide link plates, connecting pins fixed to pin holes of the guide link plates, and toothed inner link plates, and wherein connecting pins fit loosely in the pin holes of the inner link plates, the base material of the inner link plates is an austenite stainless steel, a martensite stainless steel, a precipitation-hardening steel, a high-carbon chromium bearing steel or an alloy tool steel, and is subjected to heat curing. The inner walls of the pin holes are coated with TiN, CrN, DLC, Al2O3, Mo, TiAlN, TiC, TiCN, AlN, Si3N4, SiC or NiP. The surface of each connecting pin is coated with a metallic hard coating containing at least one element selected from Cr, V, Nb, Ti, Zr, Ta, Mo and W. The base material of the connecting pins and the base material of the inner link plates are different from each other.

Abstract: A drive chain suitable for use in a continuously variable transmission of a motor vehicle, the transmission having two pairs of spaced drive members about which the chain passes to transfer torque from one drive member to the other. The chain includes a plurality of link elements that include spaced, side-by-side plate links. The plate links include openings in which pairs of parallel rocker members are disposed for relative rocking movement of at least one rocker member about its longitudinal axis. The rocker members extend outwardly beyond the plate links and are retained in position by retaining members that engage particular rocker members. A method for stretching the chain is also disclosed in which areas of some of the plate links are plastically deformed before the chain is put to use.

Abstract: This invention relates to a guide bar for a drive chain, provided with two orifices for passage of a pintle pin, each orifice being substantially triangular in shape, with substantially identical edges, in the form of arc of circle and concave. The bar is provided with a recess which extends, from an outer edge of the bar, in the direction of an opposite edge, between the afore-mentioned orifices. The bar comprises, on either side of the recess, two series of two convex edges in the form of an arc of circle, each of these convex edges being centred on the geometrical centre of one of the concave edges of a triangular orifice.

Abstract: A short pitch tooth chain that reduces the level of impact noise generated during operation is disclosed. A chain system includes a first sprocket having a plurality of sprocket teeth spaced apart by a first distance, a second sprocket also having a plurality of sprocket teeth spaced apart by the first distance, and a short pitch tooth chain wrapped around the first and second sprockets. The short pitch tooth chain includes a first link having a first aperture spaced from a second aperture by a second distance, a second link having a first toe spaced from a second toe by the first distance, the second link having a third aperture and being connected to the first link by a first pin extending through the first and third apertures, and a third link having a third toe spaced from a fourth toe by the first distance, the third link having a fourth aperture and being connected to the first link by a second pin extending through the second and fourth apertures.

Abstract: A power transmission chain having a plurality of inside links and guide links. Each inside link has at least one inverted tooth adapted to contact the teeth of an associated sprocket. Each link has a pair of apertures which are connected by connecting pins inserted through the apertures. The chain is provided with projections acting to maintain a spaced relationship between the guide links and the inside links. The spacing of the guide link away from the inside links is accomplished by spacing elements which may include projections formed on the guide link or an outer face of the outermost inside link, or by washers or spacers interposed therebetween.

Abstract: A silent chain includes guide link rows and joint link rows arranged alternately and articulately connected in an endless fashion by rocker joint pins each composed of a longer pin and a shorter pin. In each guide link row, the longer pin is fitted with two guide plates and also inserted through link plates disposed between the guide plates. In each joint link row, the shorter pin is inserted through link plates. The longer pin and the shorter pin are initially formed in a straight configuration and have the same cross-sectional shape. When the silent chain is stretched substantially straight after having been subjected to a proof load, the pitch of the guide plates is made slightly greater than the pitch of adjacent contact points between the longer pins and the shorter pins of the rocker joint pins in the guide link rows so that the longer pins are elastically deformed into a bow-like configuration bent toward the mating shorter pins.

Abstract: In a transmission having a silent chain meshing with a sprocket, each link plate of the chain includes inside engaging surfaces and outside engaging surfaces having the same shape as that of a tooth profile of a hob cutter for shaping the sprocket teeth. The sprocket, which engages the outside engaging surfaces of the link plates when the chain is seated on the sprocket teeth, includes tooth head portions shaped to avoid contact interference with inwardly curved portions of the link plates. The silent chain transmission device controls the engagement time of the inside engaging surface, and thereby decrease vibration noise and impact noise, and prevents stress concentration and wear loss on the inside engaging surface, the inwardly curved inside portion of the link plate, and the tooth head portion of the sprocket, thereby improving durability making assembly easier, and improving production accuracy.

Abstract: In a silent chain, the inner, toothed, plates and the outer guide plates are formed so that, when the centers of the holes for receiving connecting pins are disposed on a straight pitch line, the back surfaces of the guide plate are lower than the back surfaces of the inner plates by at least ½ of the difference between the inner diameters of the pin holes of the inner plates and the outer diameter of the connecting pins. As a result, the backs of the guide plates are either in flush relationship with, or below the backs of the inner plates. Pressure exerted by a guide on the back of the chain is distributed uniformly over a large area, and concentrated loads on the guide plates, which can cause dislodgment of the pins from the pin holes in the guide plates are avoided.

Abstract: A rocker joint silent chain includes rocker joints articulately connecting together multiple interleaved link plates and guide plates located outside the interleaved link plates in the widthwise direction of the chain. Each of the rocker joints is composed of a longer pin firmly fitted at opposite ends thereof in a pair of aligned pin-accommodation holes of two opposed guide plates, and a shorter pin having opposite ends projecting from opposite outer surfaces of the interleaved link plates. The ends of the shorter pin are in slight contact with inner surfaces of the guide plates. High-frequency noise and abrasive wear of the rocker joints and link plates, which may occur due to free movement of the shorter pin in the widthwise direction of the chain, can be avoided.

Abstract: A silent chain transmission mechanism comprises a silent chain, for example, a valve timing chain, composed of link rows connected to one another by connecting pins, each link row consisting of toothed link plates selected at random and arranged in parallel, side-by-side, relationship to one another, the link plates of each link row being interleaved with link plates of two adjacent link rows, and a sprocket in mesh with the chain, the sprocket having teeth cut with a hob cutter having a hob pitch smaller than the pitch of the chain. By combining the valve silent chain with the sprocket a low noise and low vibration silent chain transmission mechanism can be realized.

Abstract: A silent chain power transmitting apparatus includes a silent chain and two or more sprockets with different number of teeth, wherein the sprockets each have a tooth form formed by hobbing with a hob cutter having teeth profiled similarly with the profile of a series of trapezoidal teeth formed by the inside flanks of longitudinally overlapping link plates of the silent chain so as to cut the periphery of a cylindrical workpiece with an amount of addendum modification set in such a manner that an engagement height of the inside flank at the onset of the meshing engagement between the silent chain and the sprocket is in equal to the distance between the sprocket center and the connecting pin centers when the silent chain is wrapped around and seated on the sprocket. The outside flanks of the silent chain have a first portion profiled by an envelope that is tangent to every one of a group of tooth forms of the sprockets when the silent chain is wrapped around the sprockets with different numbers of teeth.

Abstract: A link plate for silent chains 10 includes a pair of teeth or toes 10a each formed of an inside flank 11 and an outside flank 12 and a pair of pin apertures 10b to insert connecting pins 3 thereinto. A moment M around a pin 3 is shown as follows: M=F×Lo where F is a force applied by a tooth 21 of a sprocket 20 against a meshing point 12e on the outside flank 12, and Lo is a length of a perpendicular drawn from a center O of a pin aperture 10b to an action line m of the force F. In order to decrease this moment M, the length Lo of the perpendicular is shortened, said link plate having an engaging point E with a tooth of a sprocket on an intersection between a straight line n and a flank, said straight line n and the direction of a central line connecting each center O of pin apertures forming a pressure angle &agr;, and being in contact with a circle C, said circle C having a center located at a center O of said pin aperture and a radius r≦0.25×P, where P is a pin aperture pitch.

Abstract: In a silent chain transmission, sprocket teeth have different forms, depending on the number of teeth on each sprocket. The engagement level of a chain advancing onto each sprocket matches the radius of the chain's pitch circle when seated on the sprocket. The teeth of all the sprockets are produced by a hob cutter having tooth forms substantially similar to the shapes of the inside flanks of the chain's link plates. The profiles of the outside flanks of the link plates of the chain are composed of a linear tooth head line for contacting a sprocket having a minimum number of teeth, and an arc-shaped tooth bottom line for contacting a sprocket having a maximum number of teeth, connected by an arc-shaped intermediate line. Chordal action is avoided in all the sprockets, and vibration and noise are reduced, suppressing changes in tension in the chain and resulting in improved durability.

Abstract: The chain and sprocket design of the present invention is applicable to sprockets (9) which have an even number of teeth and chains which use inward-pointing teeth and parallel links (2) and outer guides (8). The sprocket is designed such that alternate teeth (6) of the sprocket are of increased width such that when the sprocket is properly oriented they extend outward between outer guide links, which are shaped to allow the teeth to enter the inter-guide gap. If the chain attempts to jump a tooth, such that the sprocket is oriented with the wider teeth aligned with the outer guide links, the wider teeth will contact the guide links and prevent the chain from seating in the sprocket.

Abstract: A limited articulation chain design that prevents or reduces chain jumping at a given amount of chain slack comprises a chain having a plurality of alternating inner and outer links having ends interconnected by pins, wherein the ends of the outer links are partially or substantially squared on the sprocket side, such that the ends of adjacent outer links limit articulation of the links around the pins to a predetermined radius, by interfering with the adjacent outer links at the predetermined radius.

Abstract: A silent chain comprises a plurality of link plates, each having a pair of tooth parts and pin holes, stacked in the thickness direction as well as in the length direction and linked together using linking pins. Guide links are provided on the outermost sides of the link plates and are press-fit to the ends of linking pins. The guide links and link plates are relatively positioned to reduce wear on a chain guide surface by causing either the guide links or the link plates to substantially contact the guide surface.

Abstract: In a silent chain, wear of the connecting pins and bushings, and wear elongation of the chain itself, are suppressed by the formation of through holes in the approximate centers of the teeth of toothed link elements for relieving strains in the inner peripheries of the bushings due to press-fitting of the bushings into the toothed link elements. The shortest distances between the bushing hole on the one hand, and the through-hole, the outside tooth surface and the inside tooth surface, on the other hand, are made substantially equal to one another. The through holes also reduce the weights of the individual link elements and contribute to a reduction in overall weight of the chain.

Abstract: A silent chain and sprocket assembly is disclosed for use with a chain tensioner that provides driving contact on both sides of the chain and improved system wear, noise and vibration characteristics without adding to the chain's weight or material costs. The front-side sprockets employ sprocket teeth and engage the front-side silent chain links in conventional fashion. The back-side driven sprockets differ from prior silent chain sprockets in that the sprockets employ small protrusions instead of traditional teeth. The silent chain engages a back-side sprocket protrusion using the geometry of either a single link, or that of two adjacent links, as the chain wraps on the back-side sprocket.

Abstract: A tooth chain includes a plurality of links, each link having at least two spaced-apart apertures, and a plurality of pins received in the apertures for joining together the links to thereby define inner links and outer links. Each pin has a length which is sized to terminate within the aperture of the outer link, wherein the aperture has a cross sectional profile which corresponds to a cross sectional profile of a pin end at a slight clearance fit to leave a space sufficient to allow the pin end to be joined with a wall of the aperture, without projecting beyond an outer surface of the outer link.

Abstract: A sprocket for engaging a power transmission chain and for limiting motion of the chain along the radial direction of the sprocket is disclosed. The sprocket supports the chain at sprocket teeth to limit chain motion in the radial direction of the sprocket at the sprocket teeth. The support limits chain motion in the radial direction including motion induced by chordal fall.

Abstract: A rocker pin type silent chain in which a joint row and a guide row are arranged in alternation and their link plates are interleaved and articulably connected by long and short rocker pins. The linear pitch, defined by the separation of points on a pitch line intersected by lines tangent to the rolling surfaces of the rocker pins at the contact point when the chain is in a straight condition, is made equal to the chordal pitch, defined by the linear distance between intersection of similar lines with a pitch circle when adjacent links are bent as the chain is wrapped around a sprocket. With a silent chain thus constructed each link in the silent chain meshes properly with the teeth of the sprocket torque is distributed uniformly over the teeth in mesh with the sprocket.

Abstract: A silent chain comprises a link assembly including at least two inner link plates each having a pair of teeth and bushing holes and connected and fixed to each other with a pair of bushings press-fit into said respective bushing holes, an intermediate link plate including a pair of teeth and bushing holes, and a guide plate including a pair of pin holes. The members are combined and articulably connected to by other with connecting pins. A row of link assemblies is disposed in the center with respect to the width direction of the chain and extends along the longitudinal direction of the chain. The intermediate link plates are disposed on both sides of the link assembly and guide plates are disposed on outer sides of each of the intermediate link plates. Each bushing in the link assembly disposed between said intermediate link plates has a length substantially equal to the spacing space between the intermediate link plates.

Abstract: A link plate for silent chains includes a circumferential edge beveled to a greater extent at at least one of opposite longitudinal ends of the link plate than at another part including a pair of link teeth, so as to form a tapered butt-inserting portion which enables smooth intermeshing engagement of the link plate relative to a pair of laterally spaced ones of such link plates when the link plates at opposite ends of an elongated chain is connected together to form an endless chain.

Abstract: A power transmission chain having a plurality of inside links and guide links. Each inside link has at least one inverted tooth adapted to contact the teeth of an associated sprocket. Each link has a pair of apertures which are connected by connecting pins inserted through the apertures. The chain is provided with projections acting to maintain a spaced relationship between the guide links and the inside links. The spacing of the guide link away from the inside links is accomplished by spacing elements which may include projections formed on the guide link or an outer face of the outermost inside link, or by washers or spacers interposed therebetween.

Abstract: In an inner link plate, which forms a link assembly of a silent chain, positions K, L, M and N where the respective distances between a bush hole, and the outside surface portion, the inside surface portion, the back surface portion and the shoulder portion reach the shortest distances are located in the vicinity of a hypothetical circle substantially concentric with the bush hole, and at the same time the shortest distances k, 1, m and n in the respective positions K, L, M and N are formed to be the plate thickness t of the inner link plate or more.

Abstract: An inverted tooth chain which transmits power through compression. The chain has two kinds of elements, connected together by pins: inner sprocket-engaging blocks, and outer force-transmitting guide links. The ends of the sprocket-engaging blocks are connected by pins to adjoining guide links. A retaining band, preferably made of a number of laminated steel bands, runs over the backs of the sprocket-engaging blocks, and is held in place by pins running across the chain between the tops of the guide links. The sprocket engaging blocks have teeth extending inward to engage the mating teeth of sprockets, and the outward facing backs of the blocks are preferably curved and crowned to form a surface for the steel bands to center themselves as they run. The guide links are shaped to transfer the load from link to link through flat end surfaces, and are extended outward so that the pairs of guide links form rails within which the steel bands are contained.

Abstract: A chain pin includes a carbide layer that is principally composed of vanadium carbide, but also contains a small quantity of chromium carbide formed on the top of the steel forming the base metal of the chain pin. A boundary layer (i.e., chrome-rich layer) is formed in the boundary region between the carbide layer and the base metal. The vanadium carbide content decreases sharply and the chromium carbide content increases sharply in the boundary layer. Since the carbide layer formed on the top of the base metal consists principally of vanadium carbide, it is possible to prevent peeling from the surface of the carbide layer. Moreover, the boundary layer between the carbide layer and the base metal contains a relatively large quantity of chrome, so the bonding force between the base metal and the carbide layer is increased via the boundary layer. This prevents the carbide layer from peeling from the base metal. Thus, even at high surface pressures, it is possible to improve the wear resistance of the pin.

Abstract: A random arrangement type silent chain restricting run-upon phenomenon to sprocket teeth to reduce contact noise at inner engagement surface and vibration noise of free span and restricting abnormal elongation and excessive load during power transmission, is provided. In the silent chain a first link plate, which begins to engage with the sprocket tooth by an inner crotch and sits on by an outer flank, and a second link plate, which engages with and sits on the sprocket tooth only by the outer flank, are mixed and combined endlessly in a chain longitudinal direction. A mixture ratio of the first link plates to the total link plates is set to less than 50% and at least one or more of the second link plates are randomly arranged before and after the first link plates. The run-upon phenomenon to the sprocket teeth is thus restricted.

Abstract: A double-meshing-type silent chain includes link plates having the identical side profile. Each link plate has two meshing teeth and a flat back face formed opposite to the meshing teeth. Two kinds of links are alternately arranged in the longitudinal direction of the chain, while the adjacent links are connected by pins. In one kind of link, an odd number of the link plates are disposed in the width direction of the chain. In the other kind of link, an even number of the link plates are disposed in the width direction of the chain. In each link, the link plates are oriented such that the meshing teeth of link plates located at widthwise opposite ends project outwardly with respect to the chain and the meshing teeth of the remaining link plates project inwardly with respect to the chain.

Abstract: To provide a silent chain that can restrict abrasion of connection pins and the bushings and can restrict the abrasive elongation of chain so as to be especially used for a diesel engine. A circularity of bushings used in the link assembly thereof is easily maintained. The silent chain includes: a guide plate; a link assembly having an inner link plate; a middle link plate; and a connection pin that connects them freely bendably. The bushings of the link assembly have no seam being made as solid type, and a plurality of concave areas for reserving oil are formed on surfaces of both end portions thereof. The notched concave areas have a depth that does not reach the inner link plate fixed to the bushing.

Abstract: A silent chain for use with a sprocket has a plurality of interleaved rows of link plates connected together in an endless fashion, each link plate having a pair of teeth. Each of the teeth has an inside flank and an outside flank surface merging at a tip of the tooth. The inside flank has a smooth contact surface which is smaller in width than the smooth contact surface of the outside flank surface. The point where the link plate starts to move into contact with the tooth flank of the sprocket is set to locate in an area having the smooth contact surface at a relatively high rate of occupancy. With this arrangement, noise occurring at the mesh between the link plate and the sprocket can be reduced. The point where the meshing engagement completes is set to locate in an area having the smooth contact surface at a relatively high rate of occupancy. This arrangement improves the wear resistance and fatigue strength of the link plate.

Abstract: A silent chain with strength and elongation of respective link rows made uniform, elongation of every link made equal regardless of elastic and/or plastic deformation, and inexpensive production cost, is provided. The silent chain includes a first link row, a second link row, a connection pin and a pin stopper. Each of the first and second link row consists of a guide plate and a same number of link plates whose shapes and sizes are the same to configure the equal adjacent link rows. The first and second link rows are arranged in a stagger state in the chain longitudinal direction and connected alternately with the connection pins. The guide plates and the link plates of the first and second link row are composed relatively rotatable to the connection pins. A plurality of the first and second link rows are alternately arranged in mirror image symmetry.

Abstract: To provide a silent chain in which a number of parts and weight thereof are reduced and a sprocket designed optimally for the silent chain. The silent chain is made up of guide plates arranged inside in the chain width direction; link assemblies, at least one of which is arranged on both outsides of the guide plate; and outer link plates further arranged on outermost sides, and they are assembled in an interlinked manner and connected by connection pins freely bendable. The link assembly has a unified structure in which at least two inner link plates having a pair of teeth that engage with the sprocket teeth are connected by a pair of bushings. The sprocket thereof has a groove capable of inserting the guide plate being arranged inside in the silent chain width direction, and formed with a ring shape inside of an outer circumference width direction.

Abstract: A novel chain and sprocket design which is applicable to sprockets (9) which have an even number of teeth and chains which use inward-pointing teeth and parallel links (2) and outer guides (8). The sprocket is designed such that alternate teeth (6) of the sprocket are of increased width such that when the sprocket is properly oriented they extend outward between outer guide links, which are shaped to allow the teeth to enter the inter-guide gap. If the chain attempts to jump a tooth, such that the sprocket is oriented with the wider teeth aligned with the outer guide links, the wider teeth will contact the guide links and prevent the chain from seating in the sprocket.

Abstract: A silent chain power transmitting device includes a driving sprocket and at least one drive sprocket, and a silent chain stretched over the driving and driven sprockets to provide a tension run and a slack run on opposite sides of the driving sprocket. The driving and driven sprockets have a sprocket pitch (chordal pitch) designed to become substantially equal to a chain pitch of the tension run of the silent chain while operating under load. By thus designing the sprocket pitch relative to the chain pitch, toothed link plates of the silent chain are smoothly guided into sliding contact with teeth of the sprockets without causing objectionable interference or collision. The sprockets and silent chain are substantially free from abnormal wear and hence have an increased degree of durability.

Abstract: A power transmission chain having a plurality of inside links and guide links. Each inside link has at least one inverted tooth adapted to contact the teeth of an associated sprocket. Each link has a pair of apertures which are connected by connecting pins inserted through the apertures. The chain is provided with projections acting to maintain a spaced relationship between the guide links and the inside links. The spacing of the guide link away from the inside links is accomplished by spacing elements which may include projections formed on the guide link or an outer face of the outermost inside link, or by washers or spacers interposed therebetween.

Abstract: A rocker joint silent chain has guide link rows and articular link rows articulately connected by double rocker joint pins in an alternate fashion along the length of the chain. Guide link plates in each guide link row and articular link plate in each articular link row each have a pair of pin holes, and each of the double rocker joint pins is composed of a longer pin and a shorter pin that are inserted through each of the pin holes. The pin holes of at least the articular link plates have been subjected to a shaving process so as to improve the surface roughness and dimensional accuracies of inner peripheral surfaces of the pin holes. The longer and shorter pins have a hardened peripheral surface layer formed of a hard metal carbide of at least one of Cr, Ti, V, Nb and W. The double rocker joint pins and the shorter pins in particular are substantially free from local wear with the result that the wear elongation of the silent chain can be suppressed.

Abstract: A emergency replacement belt for replacing a broken fan or drive belt. The emergency replacement belt includes a flexible elongate element with a pair of opposite ends that are detachably attached together with a connector having either a J-shaped or a T-shaped hooking portion.

Abstract: A chain such as these used in a fork lift truck carriage lifting mechanism has a plurality of interleaved link assemblies each having a pair of outer link plates and a plurality of intermediate link plates. The outer link plate has a strength less than that of any intermediate link plate when measured in an unassembled state. The reduced strength may be achieved by a reduction in thickness or head area of the link plate. The outer link plates may have a stiffness of 60% to 90% of the average stiffness across the chain and a first group of intermediate link plates of certain chain configurations have a stiffness of 70% to 90% of the average stiffness of the chain. The invention provides for a chain in which the load is more evenly shared between link plates and allows a single composite chain to be replaced by two smaller chains without loss of load capacity.

Abstract: A wear-elongation resistant silent chain includes guide link rows and articular link rows articulately connected together in an alternate fashion along the length of the chain by means of connecting pins inserted through respective pin holes of guide plates, guide link plates and articular link plates, with guide plate retainers secured to respective both ends of the connecting pins so as to keep the guide plates in position against removal from the connecting plates. The guide link plate and the articular link plates have different thicknesses so dimensioned as to balance the tensile strength of the guide link plate in one guide link row and the tensile strength of the articular link plates in the adjacent articular link row connected together by one of the connecting pins, thereby suppressing bending of the connecting pin. By thus suppressing the bending of connecting pin, wear elongation of the chain is prevented from occurring during power transmitting operation of the chain.

Abstract: A silent chain for use with a driving or driven sprocket includes a plurality of link plates each having a pair of teeth engageable with teeth of the sprocket. In each of the link plates, the teeth have a pair of symmetric outside flanks that are caused to be seated on corresponding teeth of the sprocket when the teeth of the link plate are placed in full meshing engagement with the corresponding sprocket teeth, and a pair of symmetric inside flanks each having an arcuately convex profile protruding toward the other inside flank in such a manner that a leading one of the inside flanks of the link plate interferes with one of the corresponding teeth of the sprocket at the onset of the meshing engagement between the link plate and the corresponding sprocket teeth. These link plates are interconnected serially, by a plurality of pivot pins, into a longitudinally articulated strand.

Abstract: A chain includes a pair of rocker joint pins inserted through laterally aligned pin holes of two adjacent link plates. The pin holes have a pair of upper and lower pin-position constraining surfaces arranged to face upper and lower flat surfaces, respectively, of each rocker joint pin with a very small clearance defined therebetween so that the rocker joint pin is always kept in position against displacement in a vertical direction relative to the link plates. When the chain is urged to warp or bend into a V shape, each of the rocker joint pins is gripped by the upper pin-position constraining surface of one of the two adjacent link plates and a warp blocking surface of the other of the two adjacent link plate. Thus, such warping of the chain does not take place.

Abstract: A small pitch silent chain for automotive vehicle or industrial drive applications having freely rotating pins. The chain includes interleaved rows of links which are interconnected by cylindrical pins. The pins are allowed to rotate freely with respect to the links. Washers press-fit to the ends of the pins secure the pins in the chain. The pins are provided with a surface coating of vanadium carbide or chromium carbide.

Abstract: A silent chain power transmitting apparatus includes a silent chain and two or more sprockets with different number of teeth, wherein the sprockets each have a tooth form formed by hobbing with a hob cutter having teeth profiled similarly with the profile of a series of trapezoidal teeth formed by the inside flanks of longitudinally overlapping link plates of the silent chain so as to cut the periphery of a cylindrical workpiece with an amount of addendum modification set in such a manner that an engagement height of the inside flank at the onset of the meshing engagement between the silent chain and the sprocket is in equal to the distance between the sprocket center and the connecting pin centers when the silent chain is wrapped around and seated on the sprocket. The outside flanks of the silent chain have a first portion profiled by an envelope that is tangent to every one of a group of tooth forms of the sprockets when the silent chain is wrapped around the sprockets with different numbers of teeth.

Abstract: In a double-sided meshing type silent chain, guide plates each having a flat back face formed on one side thereof and a pair of pin-accommodation holes formed therein are disposed at opposite widthwise ends of the chain with the pin-accommodation holes press-fit with connecting pins which are each adapted to articulately connect two adjacent rows of link plates with each other in an interleaved fashion. The guide plates do not take part in meshing engagement with a sprocket but operate to guide the travel of the chain stably without causing flattering or vibration. The guide plates further serves as a strengthening member of the chain.

Abstract: A flexible torque-transmitting device (1) such as a chain belt that runs in an endless loop around a first and second pair of conical disks in a continuously variable transmission of a motor vehicle includes means to keep the transverse force-transfer elements (2a, 2b) from becoming dislodged out of their seating positions in the lengthwise-running links (3a, 3b, 3c) of the chain belt.

Abstract: A power transmitting silent chain apparatus comprises a silent chain and a sprocket. The silent chain is comprised of a plurality of link plates interconnected by connector pins. Each link plate has a pair of teeth. The sprocket has a plurality of involute teeth for meshing with the link plate teeth. The link plate teeth have inner and outer flanks profiled to satisfy the expression Hi=Ho+Hs, where Hi is a distance from a pitch line of the chain to a pitch line of the inner flanks, Ho is a distance from the chain pitch line to a pitch line of the outer flanks, and Hs is an amplitude of a polygonal motion of the chain.

Abstract: A silent chain includes guide links and articular links arranged in the longitudinal direction of the chain. The guide links each include one or more guide link plates, and the articular links each include two or more articular link plates. When the chain is in the straight-line state, the inside flank of each meshing tooth of any one of the link plates projects outwardly from the outside flank of each meshing tooth of another laterally adjacent one of the link plates. The projecting length of the inside flank relative to the outside flank is allowed to vary between the adjacent links, either in a random fashion or in a regular alternate fashion, along the length of the chain.

Abstract: Each link plate of a low noise silent chain has an inside meshing surface formed on the inside flank of each link tooth. The inside meshing surface includes a convexly arcuate mesh start portion disposed on a tip side of each link tooth, and a convexly arcuate mesh guide portion disposed on a root side of each link tooth. The arcuate mesh guide portion has a radius of curvature and a circular arc length which are greater than a radius of curvature and a circular arc length, respectively, of the convexly arcuate mesh start portion. When the silent chain engages a sprocket, the engagement proceeds smoothly and continuously from the inside meshing surface to the outside meshing surface. This contributes to the reduction of the noise level of the silent chain as a whole through suppression of meshing sound of the outside meshing surface and vibratory chain noise.

Abstract: A silent chain for use with a sprocket has a plurality of interleaved rows of link plates connected together in an endless fashion, each link plate having a pair of teeth. Each of the teeth has an inside flank and an outside flank surface merging at a tip of the tooth. The inside flank has a smooth contact surface which is smaller in width than the smooth contact surface of the outside flank surface. The point where the link plate starts to move into contact with the tooth flank of the sprocket is set to locate in an area having the smooth contact surface at a relatively high rate of occupancy. With this arrangement, noise occurring at the mesh between the link plate and the sprocket can be reduced. The point where the meshing engagement completes is set to locate in an area having the smooth contact surface at a relatively high rate of occupancy. This arrangement improves the wear resistance and fatigue strength of the link plate.