Interlocking piston button

Abstract

An engine piston assembly includes a piston with two opposing boss bores, a first interlocking piston button with at least one interlocking protrusion compatible with at least one interlocking recess in the first boss bore, and a second interlocking piston button with at least one interlocking protrusion compatible with at least one interlocking recess in the second boss bore. The interlocking protrusions serve to prevent the buttons from rotating inside the boss bores and deforming an oil control ring inside an oil control ring groove of the piston assembly.

What is claimed is: 
     
         1 . An engine piston assembly comprising:
 a piston including an oil control ring groove and a boss bore, the boss bore including an interlocking feature;   an interlocking piston button that fits within the boss bore and is rotationally fixed with reference to the interlocking feature, the interlocking piston button including a flattened area that aligns with the oil control ring groove when fit within the boss bore of the piston.