A camshaft is a shaft tae which a cam is fastened or o which a cam forms an integral pairt.
The camshaft wis first describit in Turkey (Diyarbakır) bi Al-Jazari in 1206. He employed it as pairt o his automata, watter-raisin machines, an watter clocks sic as the castle clock. The camshaft later appeared in European mechanisms frae the 14t century.
Amang the first caurs tae utilize ingines wi single owerheid camshafts war the Maudslay designed bi Alexander Craig an introduced in 1902, an the Marr Auto Car designed bi Michigan native Walter Lorenzo Marr in 1903.
In internal combustion ingines wi pistons, the camshaft is uised tae operate poppet valves. It consists o a cylindrical rod running the lenth o the cylinder bank wi a nummer o oblong lobes protruding frae it, ane for each valve. The cam lobes force the valves open bi pressing on the valve, or on some intermediate mechanism, as thay rotate.