Patent ID: 8061324
Filing Date: 2011-11-22
Classification: F02F,F05C

Abstract:
1. A piston internal combustion engine formed of a high performance synthetic resin material, comprising: an engine block formed of said synthetic resin material and having at least once cylinder therein; a crank mounted in the engine block; and at least one piston that travels over a stroke distance in said at least one cylinder; and for each said piston a connecting rod that has one end journalled in the associated piston and another end journalled on said crank; wherein said at least one piston is formed of said high performance synthetic resin material, and has a profile that is a regular polygon; said at least one cylinder has a profile that is in the form of said regular polygon to match the profile of the associated piston; and is formed of a plurality of flat vertical walls, of said high performance synthetic resin material, which each meet adjacent ones of said walls at corners thereof; said cylinder walls having a plurality of transverse semi-cylindrical grooves therein at respective axial levels on said side walls, such that the grooves at each said level combine to form a polygonal annular channel having an open side thereof facing towards the associated piston; a plurality of roller bearings positioned in said transverse grooves, such that said roller bearings each bear against a flat side of the associated piston; and a plurality of angle support pieces fitted within the polygonal annular channels at respective ones of said corners, adapted for rotationally supporting the ends of adjacent ones of said roller bearings and also filling a triangular space defined between the adjacent ends of successive ones of said roller bearings, such that said bearings are disposed in annular rows of bearings at each said level in the cylinder walls.