دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an eccentrically shaped disk, mounted on a camshaft, that varies in distance from its centre to various points on its circumference. As the camshaft is rotated, a set amount of motion is imparted to a follower riding on the surface of the cam. In the intenal-combustion engine, cams are used to operate the intake and exhaust valves.

n: the cylindrical bar used to support a rotating device called a cam.

n: in the drawworks, the axle on which the drawworks drum rotates. See drawworks.

n: the action in which the clutch used between an auxiliary hydrodynamic brake and the drawworks drumshaft automatically disengages and runs freely while the empty block is being hoisted.

n: a special coupling between the camshaft and the magneto of a large engine. At cranking speeds the magneto is made to rotate in quick spurts to produce large pulses of voltage at the time of ignition for each cylinder.

n: (MSHA) a US government agency that evaluates research in the causes of occupational diseases and accidents. It is responsible for administration of the certification of respiratory safety equipment. Address: 4015 Wilson Blvd.;Arlington, VA 22203;(703) 235-1385.

abbr: Mine Safety and Health Administration.