Abstract: ABSTRACT OF THE DISCLOSURE: An object of the present invention is to provide a silent chain drive device that can minimize loss of strength and wear of link plates, as well as prevent the chain from lifting up to achieve better power transmission efficiency. The silent chain drive device includes a silent chain designed for inside flank meshing/inside flank seating, and a sprocket with sprocket teeth. The plurality of link plates in the silent chain, which each have a pair of teeth, are configured to make contact with the sprocket teeth only at the inside flanks of each pair of teeth when the silent chain wraps around the sprocket and meshes with all of the sprocket teeth.

Abstract: Problem to be solved To provide an aluminum pipe support having lighter weight and higher rigidity compared to an iron pipe support. Solution An aluminum pipe support 1 is configured with two pieces of pins 2A, an inner pipe 3 having an outer periphery formed in any one of a regular hexagonal shape, a regular octagonal shape, and a regular decagonal shape, and having, at a position not subjected to insertion of the pin 2A, a cross-sectional area of 1.96 times or larger than a cross-sectional area at a corresponding position of an inner pipe of a targeted-size iron pipe support, an outer pipe 2 having an inner shape allowing the inner pipe 3 to be inserted into, and having, at a position not subjected to the insertion of the pin 2A, a cross-sectional area of 1.35 times or larger than a cross-sectional area at a corresponding position of an outer pipe of the targeted-size iron pipe support.

Abstract: Two reduction gears have at least two common rotation center axes. A first power source (121) is coupled to the high-speed side of a first reduction gear (111) on a first rotation center axis (101). A second power source (122) is coupled to the high-speed side of a second reduction gear (112) on a second rotation center axis (102). A first input/output shaft (141) is coupled to the low-speed side of the second reduction gear (112) on the first rotation center axis (101). The high-speed side of the first reduction gear (111) is coupled to the low-speed side of the second reduction gear (112) on the first rotation center axis (101) via a first clutch (131). The low-speed side of the first reduction gear (111) is coupled to the high-speed side of the second reduction gear (112) on the second rotation center axis (102) via a second clutch (132).

Abstract: To provide a metal chain having reduced weight and size but uncompromized strength, and manufacturable/assemblable with reduced work burden and cost. A metal chain is formed by coupling together a plurality of inner links and outer links alternately and pivotably in a longitudinal direction of the chain. Each of the outer link includes a pair of front and back pins and a pair of left and right outer plates. Each of the inner links includes a pair of front and back bushings and a pair of left and right inner plates. The pair of front and back bushings and the pair of left and right inner plates of the inner link are integrally formed as one component.

Abstract: To provide a metal chain having reduced weight and size but uncompromised strength, and manufacturable/assemblable with reduced work burden and cost. A metal chain is formed by coupling together a plurality of inner links and outer links alternately and pivotably in a longitudinal direction of the chain. Each of the outer link includes a pair of front and back pins and a pair of left and right outer plates. Each of the inner links includes a pair of front and back bushings and a pair of left and right inner plates. The pair of front and back bushings and the pair of left and right inner plates of the inner link are integrally formed as one component.

Abstract: In a silent chain, rocker joint pins are composed of first and second rocker pins having mutually engaging front rolling surfaces. Each first rocker pin is fixed to pin fixing link plates of a first link, and extends through holes in other link plates of the first link. Each first pin has a back surface engaged with portions of the pin holes in the other link plates of the first link on the inner side of a pitch line, but is spaced by a gap from portions of the same pin holes on the outer side of the pitch line. The second rocker pin moves with link plates of a second link which forms a link pair with the first link, and elastically deforms the first rocker pin when the second link is flexed relative to the first link, thereby resisting flexion of the link pair and reducing impact noise.

Abstract: In a silent chain of the inner flank engagement and outer flank seating type, the link plate teeth are arranged so that their rearwardly facing inner flanks protrude slightly beyond the outer flank overlapping link plate teeth in a preceding row when the chain is straight and in tension. The rearwardly facing inner flank is composed of an arc-shaped engagement starting region adjacent the tip and a straight engagement guiding region extending toward the root.

Abstract: There is provided a chain comprising guide link rows and non-guide link rows disposed alternately along the length of the chain with each plate of each row overlapping each plate of each of two adjacent rows. For each guide link row, a pair of pins is provided for connecting the guide link rows and non-guide link rows in articulating relationship. The first connecting pin extends into a first hole of each of the guide plates of its guide link row and into and through the second hole of each link plate of an adjacent non-guide link row. The second connecting pin extends into a second hole of each of the guide plates extends into and through a first hole of each link plate of an adjacent non-guide link row. The connecting pins fit tightly into each first hole into which it extends and fits loosely in each second hole into which it extends.

Abstract: In a silent chain, rocker joint pins are composed of first and second rocker pins having mutually engaging front rolling surfaces. Each first rocker pin is fixed to pin fixing link plates of a first link, and extends through holes in other link plates of the first link. Each first pin has a back surface engaged with portions of the pin holes in the other link plates of the first link on the inner side of a pitch line, but is spaced by a gap from portions of the same pin holes on the outer side of the pitch line. The second rocker pin moves with link plates of a second link which forms a link pair with the first link, and elastically deforms the first rocker pin when the second link is flexed relative to the first link, thereby resisting flexion of the link pair and reducing impact noise.

Abstract: In a chain transmission incorporating a silent chain engaged with a sprocket, the plates of the chain are connected by sets of rocker pins extending through pin holes in the plates. The pin holes are elongated toward the center of each plate, and the elongation of each pin hole is greater than the maximum amount by which the distance between points on the respective rocker pins of each set increases when said chain is inflected to the maximum extent permitted by the sprocket in a portion of the chain in seating engagement with said sprocket.

Abstract: In a silent chain, cushion pads are provided in the inner flank regions of at least every second link row. These cushion pads restrict inward flexion of the chain and reduce vibration of the free span regions of the chain. The cushion pads can be individual pads each associated with a link plate, or elongated pads each associated with a row of link plates. In either case, side parts protruding toward the outside of the loop formed by the chain can also restrict outward flexion of the chain.

Abstract: There is provided a chain comprising guide link rows and non-guide link rows disposed alternately along the length of the chain with each plate of each row overlapping each plate of each of two adjacent rows. For each guide link row, a pair of pins is provided for connecting the guide link rows and non-guide link rows in articulating relationship. The first connecting pin extends into a first hole of each of the guide plates of its guide link row and into and through the second hole of each link plate of an adjacent non-guide link row. The second connecting pin extends into a second hole of each of the guide plates extends into and through a first hole of each link plate of an adjacent non-guide link row. The connecting pins fit tightly into each first hole into which it extends and fits loosely in each second hole into which it extends.

Abstract: In a rocker joint silent chain, the link plates have two different engagement pitches, and the connecting pins are composed of combinations of rocker pins and joint pins, where each rocker pin has one of two thicknesses and each joint pin has one of two thicknesses, so that the rocker joint pins of the chain have three different thicknesses. The link plates and connecting pins are arranged randomly along the length of the chain.

Abstract: In a silent chain having interleaved guide rows and joint rows, guide plates at the outer sides of the guide rows are connected by engagement pins which extend through overlapping recesses formed on the outer flanks of the guide row plates, and on the inner flanks of the joint row plates. The engagement pins contact sprocket teeth before the outer flanks of the guide row plates contact the sprocket teeth. Cutouts formed in the guide plates adjacent the engagement pins allow the guide plates to deform and thereby absorb the impact imparted to the engagement pins by the sprocket teeth.

Abstract: In a chain transmission incorporating a silent chain engaged with a sprocket, the plates of the chain are connected by sets of rocker pins extending through pin holes in the plates. The pin holes are elongated toward the center of each plate, and the elongation of each pin hole is greater than the maximum amount by which the distance between points on the respective rocker pins of each set increases when said chain is inflected to the maximum extent permitted by the sprocket in a portion of the chain in seating engagement with said sprocket.

Abstract: In a silent chain of the inner flank engagement and outer flank seating type, the link plate teeth are arranged so that their rearwardly facing inner flanks protrude slightly beyond the outer flank overlapping link plate teeth in a preceding row when the chain is straight and in tension. The rearwardly facing inner flank is composed of an arc-shaped engagement starting region adjacent the tip and a straight engagement guiding region extending toward the root.

Abstract: In a silent chain comprising interleaved and relatively pivotable rows of link plates, protrusions formed in the link plates contact relatively pivotable link plates in adjacent rows so that the area of contact is reduced. The protrusions can be annular, or they can be in the form of arcs that are of a size and position such that the arcuate protrusions of each plate do not interfere with the arcuate protrusions of an adjacent plate as the chain bends during use. The plates can have rectangular protrusions, or arcuate protrusions each consisting of an arc-shaped collection of dot-shaped protrusions.

Abstract: In a silent chain, cushion pads are provided in the inner flank regions of at least every second link row. These cushion pads restrict inward flexion of the chain and reduce vibration of the free span regions of the chain. The cushion pads can be individual pads each associated with a link plate, or elongated pads each associated with a row of link plates. In either case, side parts protruding toward the outside of the loop formed by the chain can also restrict outward flexion of the chain.

Abstract: In a silent chain having interleaved joint link plates and guide link plates each having a pair of teeth and a pair of pin holes, the pin holes in each of the joint link plate are elongated in the direction of elongation of the chain, and extend toward each other from the two connecting pins extending through the pin holes so that a gap is formed between each of the two connecting pins and the other. The pin holes of each of the toothed guide link plates are circular pin holes. The elongation of the pin holes of the joint link plates allows the joint links to shift longitudinally with respect to the guide link plates on engagement of the chain with a sprocket, reducing clashing noise.

Abstract: In a silent chain having interleaved guide rows and joint rows, guide plates at the outer sides of the guide rows are connected by engagement pins which extend through overlapping recesses formed on the outer flanks of the guide row plates, and on the inner flanks of the joint row plates. The engagement pins contact sprocket teeth before the outer flanks of the guide row plates contact the sprocket teeth. Cutouts formed in the guide plates adjacent the engagement pins allow the guide plates to deform and thereby absorb the impact imparted to the engagement pins by the sprocket teeth.