Patent Number: 7,762,227

Title: Coolable piston for internal combustion engine

Abstract: A coolable piston for internal combustion engines is disclosed herein. The coolable piston includes a head portion with a crown and an annular wall. First and second shoulders are defined in annular wall adjacent to one another. A collar is formed on a distal end of the annular wall and flanged over to project radially inwardly from the distal end. An annular rib extends from the crown and within the annular wall to thereby define an annular cavity with the annular wall. The annular cavity extends along the longitudinal axis from a first end closed by the crown to a second end at the distal end of the annular wall. The coolable piston also includes first and second pin bosses disposed at a distal end of the annular rib. The coolable piston also includes an annular notch formed in the annular rib and substantially opposing the first shoulder. The coolable piston also includes a ring member closing the second end of the annular cavity. The ring member is releasably engaged with both of the annular rib and the annular wall for servicing. The ring member has an inner periphery supported against movement along the longitudinal axis by the annular notch. The ring member has an outer periphery disposed between the first shoulder and the second shoulder. The coolable piston also includes a locking ring disposed in the collar against the second shoulder and supporting the outer periphery of the ring member against axial movement.

Inventors: Sadowski; Michael S. (Elmhurst, IL), Mickelson; Michael L. (Gurnee, IL)

Assignee: Federal Mogul Corporation

International Classification: F16J 1/14 (20060101)

Expiration Date: 7/27/12018