دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a mechanical drive using a driving chain and chain gears to transmit power. Power transmissions use a roller chain, in which each link is made of side bars, transverse pins, and rollers on the pins. A double roller chain is made of two connected rows of links, a triple roller chain of three, and so forth. chain guard n: in a chain-and-sprocket drive, a case that protects workers from the moving drive. It also protects die drive from dirt and is part of the cooling and lubrication systems. Some enclose only one drive and some enclose several drives. May be made of sheet metal or plate metal. Heavier guards also support the shafts on bearings. Both types have access panels for inspection and maintenance.

n: The compounding transmiting and variable speed driving rig whose power package uses multi-line roller chain.

n: in roller chain, the width of the rollers, which is the distance between the inside faces of the roller link plates.

n: in roller chain, a type of link used to make a continuous loop of chain by connecting the two ends of the chain. The connector link is a pin link with either a spring clip or a cotter to hold the pins.

n: 1. the male threaded section of a tool joint. 2. on a bit, the threaded bit shank. 3. one of the pegs that are fitted on each side into the link plates (side bars) of a chain link of roller chain and that serve as the stable members onto which bushings are pressfitted and around which rollers move. See wrist pin.

n: the male section of threaded connection.

n: in roller chain, about 5/16 of the pitch. See pitch.

n: a link of roller chain consisting of four parts-two side bars and two pins. The pins are press-fitted into the side bars (pin link plates).

n: in roller chain, the plate into which the pin link pins ends are immovably fixed. The pins are riveted to the link plate on one side and either riveted or fixed with cotters to the other pin link plate. pin packer n: a packer in which the packing element is held in position by brass or steel pins. When weight is put on the packer, two metal sleeves telescope, shearing the pins and allowing the element to fold and pack off.

n: 1. in wireline spooling, the degree of slope that the wireline travels in going from one wrap to the next. 2. in roller chain, the distance (in inches or millimetres) between the centres of two members next to one another, i.e., the distance between the centres of the bushings or rollers. 3. on offshore floating rigs, the up-and-down movement of the hull from the bow to the stem.

n: one of the links in a roller chain. It consists of two txlshings press-fitted into the link plates (side bars) and two rollers that fit over the bushings. The bushings are locked into the link plates to prevent rotation.