Internal-combustion engine with opposed pistons

An internal-combustion engine comprising a housing including at least one cylinder unit comprising a cylinder bore with two opposed pistons each having two working faces slidably mounted therein and with fuel admission means, first, second, third and fourth annular channels extending around and adjacent the wall of the cylinder bore over a portion of the length thereof, each of said annular channels being in communication with the interior volume of the cylinder bore through spaced apart openings, the first and fourth annular channels being located at one end of the cylinder bore and the second and third annular channels being located at the opposite end of the cylinder bore;

• transfer channel means having a length extending lengthwise of the cylinder bore and extending around and adjacent a portion of the wall of the cylinder bore, said transfer channel means being in direct communication with said first second and third annular channels;
• air intake pipe means extending lengthwise adjacent and along the length of said transfer channel means, a common partition between the air intake pipe means and the transfer channel means along the length of said transfer channel means, said common partition having a plurality of spaced apart apertures therethrough distributed lengthwise of the transfer channel means, said apertures having one-way low-inertia gate means allowing a high rate of air flow from the air intake pipe means through the transfer channel into the cylinder bore and substantially no air flow back from the cylinder bore through the transfer channel means into the air intake pipe means;
• and an exhaust pipe connected to said fourth annular channel for discharge of the spent products of combustion.