公开(公告)号：US10774781B2

公开(公告)日：2020-09-15

申请号：US15414954

申请日：2017-01-25

Applicant: FEDERAL-MOGUL CORPORATION

Inventor： Miguel Azevedo ,  Warran Boyd Lineton ,  Geoffrey Neil Ainsworth

IPC: F02F3/22 ,  F02F3/00

Abstract: A steel piston with anti-coking design features is provided. The piston includes an upper crown portion and a lower crown portion forming an outer cooling gallery therebetween. The outer cooling gallery is substantially closed except for an oil inlet, oil outlet, and optional oil passage(s) to a central cooling gallery. According to one embodiment, at least one anti-coking insert is disposed in the outer cooling gallery and sized to prevent escaping through the oil inlet or the oil outlet. For example, the insert(s) can comprise a helical coil, a plurality of steel balls, coil springs, or chips formed of polymer with abrasive filler. Alternatively, an outer gallery floor to the outer cooling gallery includes a plurality of anti-coking openings disposed sequentially in decreasing spaced relation from one another, or anti-coking openings with varying lengths.