Piston for an internal combustion engine

Abstract

A cooling structure for an internal combustion engine piston is provided. The piston includes an oil cooling channel integrated in the piston. The oil cooling channel has a bottom surface facing towards a top surface of the piston and a top surface facing away from the top surface of the piston. The oil cooling channel is provided with an oil inlet and an oil outlet which are laterally separated from each other. The bottom surface and/or the top surface of the oil cooling channel is slanted relative to a central axis of a wrist pin opening provided in said piston.

1 . A cooling structure for an internal combustion engine piston comprising an oil cooling channel integrated in the piston, the oil cooling channel having a bottom surface facing towards a top surface of the piston and a top surface facing away from the top surface of the piston, the oil cooling channel being provided with an oil inlet and an oil outlet which are laterally separated from each other, the bottom surface and/or the top surface of the oil cooling channel being slanted relative to a central axis of a wrist pin opening provided in the piston, wherein the bottom surface is slanted downwards, relative to the wrist pin opening, from the oil inlet to the oil outlet, and the top surface is slanted upwards, relative to the wrist pin opening, from the oil inlet to the oil outlet. 
     
     
         2 - 3 . (canceled) 
     
     
         4 . The cooling structure according to  claim 1 , wherein the oil outlet is provided with a mechanical stop. 
     
     
         5 . The cooling structure according to  claim 1 , wherein the oil inlet is provided with a mechanical stop. 
     
     
         6 . A method of cooling a piston in an internal combustion engine, comprising the steps of
 providing an oil cooling channel in the piston,   providing oil into the oil cooling channel via an oil inlet, transferring oil from the oil inlet to an oil outlet provided in the oil channel,   forcing the oil from the oil inlet to the oil outlet by a bottom surface of the oil cooling channel which is slanted relative to a central axis of a wrist pin opening provided in the piston while the piston is moving from a Bottom Dead Centre (BDC) to a Top Dead Centre (TDC) and/or by a top surface of the oil cooling channel which is slanted in an opposite direction relative the bottom surface while the piston is moving from the TDC to the BDC.