Caterpillar Inc.
Piston having oil gallery drain outlets biased in distribution to anti-thrust side

Abstract:

A piston for an internal combustion engine includes a piston crown and a piston skirt, and an oil gallery formed between the piston crown and the piston skirt. A gallery inlet to the oil gallery, and a plurality of gallery drain outlets are formed in the piston skirt. The gallery drain outlets have, circumferentially around the piston center axis, a non-axisymmetric arrangement in a distribution biased to an anti-thrust side of the piston.