crankpin
Noun
Meaning
English Wikipedia has an article on:crankpinWikipedia
crankpin (plural crankpins)
The pin that attaches a connecting rod to a crank
Examples
Fatigue strength The fatigue strength of crankshafts is usually increased by using a radius at the ends of each main and crankpin bearing.
However, in 1978 Chevrolet introduced a 90° 200/229 V6, which had a compromise 'semi-even firing' design using a crankpin that was offset by only 18°.
In the process, it powers a piston that transmits power directly through a connecting rod (US: main rod) and a crankpin (US: wristpin) on the driving wheel (US main driver) or to a crank on a driving axle.
Most V8 engines share a common crankpin between opposite cylinders in each bank, and a 90° V8 crankshaft has just four pins shared by eight cylinders, with two pistons per crankpin, allowing a cylinder to fire every 90° to achieve smooth operation.
Such a 'split' crankpin is weaker than a straight one, but modern metallurgical techniques can produce a crankshaft that is adequately strong.