Patent ID: 9027462
Filing Date: 2015-05-12
Classification: F16J

Abstract:
1. A piston ring for a piston of internal combustion engine with an engine cylinder; said piston ring comprising: a body member for sitting in a ring groove of said piston; said body member having an inner periphery, upper wall, lower wall and an outer periphery; said outer periphery having a concavity therein for storing lubricant therein; said upper wall having an outer section proximate to said outer periphery being constructed to be resiliently flexible between a flexed and unflexed position such that during a portion of a power stroke, the volume of said concavity to store said lubricant is decreased by the flexing of said upper wall to the flexed position for expelling lubricant from the concavity to a wall of said cylinder, and said upper wall resiliently returns to said unflexed position during other times to allow excess lubricant from said wall of said cylinder to pass into said concavity; an insert member being housed in said concavity that is porous to absorb lubricant and compressible to release said lubricant; and a positive stop member for limiting the flexing of said upper wall and the compression of said insert member.