Connecting rod

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Piston (top) an connecting rod frae teepical automotive ingine (scale is in centimetres)

A connecting rod is a shaft which connects a piston tae a crank or crankshaft in a reciprocating ingine. Thegither wi the crank, it forms a semple mechanism that converts reciprocating motion intae rotating motion.

A connecting rod mey an aw convert rotating motion intae reciprocating motion, its oreeginal uise. Earlier mechanisms, sic as the chain, coud anly impart pulling motion. Bein rigid, a connecting rod mey transmit aither push or pull, allouin the rod tae rotate the crank throu baith halves o a revolution. In a few twa-stroke ingines the connecting rod is anly required tae push.

The day, the connecting rod is best kent throu its uise in internal combustion piston ingines, sic as automobile ingines. Thir are o a distinctly different design frae earlier forms o connecting rod uised in steam ingines an steam locomotives.