Crankshaft -aircraft engine-

Engine Component

Function of Crankshaft

• Changes reciprocating motion of pistons into rotating motion to drive propeller

• Constructed of chrome-nickel-molybdenum-steel• May be one piece or as many as three separate

pieces• The propeller mounts to the front of the

crankshaft using a spline, taper, or flange• The crankshaft rotates within the crankcase and is

supported by main bearing journals• Crankshaft throws or crankpins are off center and

account for the reciprocating motion of the pistons

TYPES OF CRANKSHAFT

• same plane • cross plane crank shaft

TYPES OF CRANKSHAFT

• Single-trow • Two-trow • Four-trow• Six-trow

Crankshaft Main Bearing Journal, Pin, Arm

Crankshaft

Crankshaft Ends For Mounting Propellers

How Crankshaft works ?

2 PIECE CRANKSHAFT WITH COUNTERWEIGHTS (SINGLE THROW, SINGLE CYLINDER )

STRESS ON CRANKSHAFT

• The shaft is subjected to various forces but generally needs to be analysed in two positions. Firstly, failure may occur at the position of maximum bending; this may be at the centre of the crank or at either end. In such a condition the failure is due to bending and the pressure in the cylinder is maximal. Second, the crank may fail due to twisting, so the conrod needs to be checked for shear at the position of maximal twisting. The pressure at this position is the maximal pressure, but only a fraction of maximal pressure

CRANKSHAFT

LOCATION

• CRANKSHAFT LOCATED AT AIRCRAFT ENGINEe

Materials

THE END