دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: The bearing that can prevent the rotary table jumping due to the component force of gear.

n: one of a pair of toothed wheels whose working surfaces are inclined to nonparallel axes.

n: The maximal brake torque produced by brake gear when laying down safely.

n: Controlling drilling winch through brake gear.

n: (slang) a driller who is said to rely too heavily on the drawworks brake.

n: Slang. Depreciated name for the driller who depends on brake gear super.

n: the large circular gear in a mud pump that is driven by the prime mover and that, in turn, drives the connecting rods.

n: The big and round gear installed in drilling pump.

n: see chain drive. chain-and-sprocket drive n: a type of drive that consists of a loop of chain that goes around two shafts with sprockets fitted on the shafts. The driving shaft provides power and the driven shaft receives power. When the sprocket on the driving shaft turns, the chain moves and turns the driven sprocket. chainand- sprocket transmission n: a selective transmission made up primarily of chain-andsprocket drives. There are three two-strand chain-and-sprocket drives and a pair of gears for reversing, located between the input shaft coming from the compound, and the output shaft on a mechanically driven drawworks. Each of these chain-and- sprocket drives has a different sprocket ratio to provide three speeds to the high-drum drive and three to the low-drum drive. Com- pare gear transmission.

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: a meter index that has a pressure correction factor built into the gear ratio of the dial.