Wednesday, May 13, 2020

Oil cooled piston of medium speed diesel engine

Piston above has an alloy steel crown containing chromium and molybdenum to give increased strength and resist corrosion at high temperatures. Suitable for burning residual fuels. Aluminium alloy skirt (subject to lower thermal and mechanical loads) is light and has low inertia, reducing stress reversal on bottom end bolts. Clearances are larger than for a cast iron skirt, which although heavier has a low coefficient of expansion and self lubricating properties giving a low coefficient of friction.
Large diameter gudgeon (piston) pin and large bearing surface keeps bearing loads to acceptable limits, eliminating edge loading due to bending of pin

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