Internal combustion engine using opposed pistons

An internal combustion engine, comprising:

• an engine block having a pair of end portions;
• at least two combustion cylinders disposed within the engine block, each combustion cylinder defining opposing end portions and having a piston reciprocally secured within each end portion of the cylinder, the pistons within each combustion cylinder defining a combustion chamber therebetween;
• a piston rod extending from each of the pistons;
• a bearing pack secured to each of the piston rods, each bearing pack comprising a power bearing and a retractor bearing, the power bearing and retractor bearing being substantially coaxial;
• a rotatably mounted cam corresponding to each end portion of the engine, each cam defining a power track corresponding to the power bearing, and a return track corresponding to the return bearing;
• whereby reciprocating movement of the pistons rotates each cam;
• and
• wherein the retractor bearing is biased towards the return track.

An internal combustion engine, comprising:

• an engine block having a pair of end portions;
• at least two combustion cylinders disposed within the engine block, each combustion cylinder defining opposing end portions and having a piston reciprocally secured within each end portion of the cylinder, the pistons within each combustion cylinder defining a combustion chamber therebetween, each piston having a high pressure side facing the combustion chamber and a low pressure side, each piston further having a piston ring defining a plurality of lift pockets, and a plurality of trenches defined between the lift pockets, the trenches being in communication with the low pressure side of the piston, the lift pockets being structured to direct an airflow to a location between the piston ring and a wall of the combustion cylinder, the trenches being structured to permit any blowby from the high pressure side of the piston to flow to the low pressure side of the piston while resisting the flow of blowby within the lift pockets;
• a piston rod extending from the low pressure side of each of the pistons;
• a bearing pack secured to each of the piston rods, each bearing pack comprising a power bearing and a retractor bearing, the power bearing and retractor bearing being substantially coaxial;
• and
• a rotatably mounted cam corresponding to each end portion of the engine, each cam defining a power track corresponding to the power bearing, and a return track corresponding to the return bearing;
• whereby reciprocating movement of the pistons rotates each cam.