Crankshaft

related topics
{ship, engine, design}
{@card@, make, design}
{acid, form, water}
{rate, high, increase}
{math, energy, light}
{car, race, vehicle}
{land, century, early}

The crankshaft, sometimes casually abbreviated to crank, is the part of an engine which translates reciprocating linear piston motion into rotation. To convert the reciprocating motion into rotation, the crankshaft has "crank throws" or "crankpins", additional bearing surfaces whose axis is offset from that of the crank, to which the "big ends" of the connecting rods from each cylinder attach.

It typically connects to a flywheel, to reduce the pulsation characteristic of the four-stroke cycle, and sometimes a torsional or vibrational damper at the opposite end, to reduce the torsion vibrations often caused along the length of the crankshaft by the cylinders farthest from the output end acting on the torsional elasticity of the metal.

Contents

History

Classical Antiquity

The earliest evidence for the crank as part of a machine, that is in combination with a connecting rod, anywhere in the world appears in the late Roman Hierapolis sawmill from the 3rd century AD and two Roman stone sawmills at Gerasa, Roman Syria, and Ephesus, Asia Minor (both 6th century AD).[1] On the pediment of the Hierapolis mill, a waterwheel fed by a mill race is shown powering via a gear train two frame saws which cut rectangular blocks by the way of some kind of connecting rods and, through mechanical necessity, cranks. The accompanying inscription is in Greek.[2]

Full article ▸

related documents
Browning Hi-Power
AK-74
Dinghy
Sleeve valve
AK-47
Rifling
Vacuum cleaner
Reactive armour
Compression ratio
IMI Galil
Hollow-point bullet
Hydrofoil
Self-propelled artillery
Armoured fighting vehicle
Delta wing
SM-65 Atlas
Bristol Blenheim
Hybrid rocket
AH-1 Cobra
Longship
Heinkel He 162
Turbopump
Mir
Flintlock
Apollo 11
Percussion cap
M249 Squad Automatic Weapon
RMS Olympic
Ground effect in aircraft
Mary Rose