Abstract: A silent chain has a plurality of interconnected plates adapted for operative engagement with toothed surfaces of a sprocket. Each of the plates has flank surface portions and crotch surface portions, with the crotch surface portions having protruding portions. The protruding portions of the crotch surface portions make contact with the toothed surfaces of the sprocket at the beginning of engagement of each plate with the sprocket and are spaced away from the toothed surfaces of the sprocket at least during engagement of the flank surface portions with toothed surfaces of the sprocket.

Abstract: A plate for a silent chain has a side punched into a forked shape for engagement with a sprocket. The forked side of the plate has inner engaging surfaces opposing each other, outer engaging surfaces, and an arcuate leg-side end surface connecting the inner engaging surfaces. The leg-side end surface, on which stress is likely to be concentrated, has a shear face tissue along at least 70% of the thickness of the plate. A silent chain having such a plate has a high plate fatigue strength and enhanced durability and reliability, and can be manufactured at a low cost.

Abstract: A silent chain, as well as a rocker pin and a plate of the silent chain, are provided which are capable of enhancing the transmission efficiency, and improving the fatigue strength of the plate to thereby prolong the service life of the silent chain. Rocker pins are inserted into the pin holes of each plate of a plurality of plates of a silent chain. The rocker pins are located closer to outer ends of the plate and are formed with generally flat plate abutting surfaces. The plate abutting surfaces are received by generally flat pin seating surfaces of the pin holes, respectively, to surely prevent rotation of the rocker pins relative to the pin holes. Further, in addition to the generally flat pin seating surfaces, generally flat and short continuous surfaces are formed centrally up and down of each pin hole. Thus, stress concentration on the plate is diminished and the fatigue strength of the plate is improved.

Abstract: A silent chain is provided in which a plurality of link plates of a certin configuration may have an identification indicator marked on a reference surface thereof at the time connecting pin inserting holes are punched into the link plates in order to ensure the link plates are properly directed in the same direction, are superposed on the connecting pins, and are constituted in a chain-like manner by the connecting pins so that meshing surfaces of the link plates mesh smoothly to prevent any meshing noise.

Abstract: A pin-ball type reduction gear comprising of a casing rotatably supporting an input shaft and an output shaft such that the input shaft is butted against the output shaft with an interval. A planetary disk eccentrically and rotatably supported by the input shaft. A wave-shaped epitrochoid curve groove, and balls in the number larger than that of the waves of the epitrochoid curve groove, which are provided between the casing and the planetary disk in such a manner as to be engaged with each other and a plurality of pins provided between planetary disk and the output shaft so as to be in parallel to the input shaft and the output shaft, and pin insertion holes each inserted with the pins. The pins and pin insertion holes in the same number are disposed along a circle of the planetary disk or output shaft around the axis of the planetary disk or output shaft and gaps allowing the eccentric motion of the planetary disk to the output shaft are each formed between the pin insertion holes and pins.

Abstract: A novel and improved rotary shaft coupling including a ball-type speed reducer. A driving disc is coupled to a driven disc through a plurality of balls loosely held in a circular array of holes. Each ball registers with opposing faces of elliptic and hypocycloidal grooves of the driven and driving disc, respectively. When the driving disc is rotated, the balls transmit a turning force through the grooves to the driven disc. Speed reduction is determined by the number of waves in the hypocycloidal groove exceeding, by an even number, the number of balls.

Abstract: An auxiliary intake passage system for internal combustion engines having a main carburetor delivering a lean mixture to main combustion chambers through a main intake passage, and an auxiliary carburetor delivering a rich mixture to auxiliary combustion chamber through an auxiliary intake passage. The auxiliary intake passage system is comprised of an induction passage leading from the auxiliary carburetor to an auxiliary intake distribution chamber. A plurality of branch passages extend laterally from said auxiliary intake distribution chamber and lead to the auxiliary combustion chambers. The induction passage comprises a first portion of substantially uniform cross-sectional area connected to a second portion which is tapered and so formed that the internal wall of the tapered section is outside the axial projection of the internal wall of the first portion, thus minimizing resistance to fluid flow and improving fuel distribution and homogenation to each combustion chamber.