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The crankshafts are built-up types. For the semi-built type, the forged main bearing journals are shrunk into cast steel crank throws with a crank journal and two crank throws as one unit. In the fully built type, the crank throws are shrunk onto main journals and crank journals. The crank throws are displaced from each other to obtain the same number of degrees between the different crank throws. The crankpin journals are provided with large bores for balancing purpose.



Related Terms

CRANK WEB

The arm of a crank connecting the crankshaft to crankpin, or connecting two adjacent crankpins.

CRANK ANGLE

  1. The angle between a crank and some reference direction. 2. Specifically, the angle between the crank of a slider crank mechanism and a line from crankshaft to the piston.

DOUBLE-CRANK PRESS

A mechanical press with a single wide slide operated by a consisting of an inner and an outer tube; the crankshaft having two crank pins.

OVERRUNNING CLUTCH

A clutch that allows the driven shaft to turn freely only under certain conditions; for example, a clutch in an engine starter that allows the crank to turn freely when the engine attempts to run.

SHAFT-TO-BORE MISALIGNMENT (S.T.B.M.)

The amount by which the shaft is off centre, with respect to bores centre.

LABYRINTH SEAL

A clearance seal with no friction contact. Used on turbines as shaft seals.

TAIL SHAFT

The ships propeller shaft

CAM

Eccentric shaft used in most internal combustion engines to open and close valves.

HYDRAULIC MOTOR

A hydraulic actuator of rotary type. Has a cylindrical cartridge with several hydraulic cylinders which rods linear movement converted into shaft rotation. Direction of shaft rotation depends on sequence of working cylinders activation.

BEARING

A support or guide by means of which a moving part such as a shaft or axle is positioned with respect to the other parts of a mechanism.

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