Crank Pin

Crank Pin is a cylindrical piece which forms the handle of a crank or to which a connecting rod is attached. In a reciprocating engine, the crankpins, also known as crank journals are the journals of the big end bearings, at the ends of the connecting rods opposite to the pistons.

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Detailed Description for Crank Pin

Mechanical cranks convert linear motion into rotary motion or vice versa. In general, cranks consist of a main shaft which rotates, a crank pin which revolves like a planet around it, and a crank throw to solidly connect them. Handles or knobs on hand-driven cranks may either comprise the crank pins or spin freely on the crank pins. Crank pins are most often parallel to their main shafts. For cranks that can turn through a full 360 degrees, their crank pins must be offset to the side of the main shaft.

Cranks can be found at work in every area of life wherever manual motion is converted to rotary motion. Fishing reels, manual winches, meat grinders, and garden hose reels all use cranks to allow people to easily create continuous rotary motion. Bicycle pedals function as crank pins between the rider’s foot and the pedal crank that drives the chain.


A crank pin may be a pin, bolt, or screw, or it may be machined into the crank as one piece. On the classic steam locomotives that ruled the tracks of the early to mid-1900s, the crank pins were part of the large main drive wheels. Long steel rods connected the steam cylinders on each side of the locomotive to one of these wheels. The remainder of the drive wheel crank pins were connected by a single long beam that kept the wheels on each side turning in unison. 


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