Internal combustion engine

Claim 1

A two-stroke internal combustion engine comprising: (i) a cylinder (ii) a piston movable in said cylinder and defining a combustion chamber therein (iii) a crank-case having an arcuate face (iv) an air chamber disposed laterally at the upper part of said crank-case (v) an air inlet on said air chamber, said air inlet having thereon a non-return air inlet valve for said air chamber (vi) a guide plate spaced from and extending along said arcuate face of said crank-case so as to define therewith an air flow passageway opening at one end into said air chamber and continually open at the other end into the lower portion of said crank-case (vii) means in said crank-case and cylinder defining a combustible mixture ejecting port communicating at one end with said crank-case and at the other end with said combustion chamber, said port being opened at said other end when the piston is at and approaching bottom dead centre position (viii) a passage-forming means defining an air ejecting port communicating at one end with said air chamber and at the other end with said combustion chamber adjacent to said mixture ejecting port said air ejecting port being positioned above said mixture ejection port and directed in relation to said mixture ejecting port such that, upon opening of said mixture ejecting port subsequent to the opening of said air ejecting port during passage of said piston during a downstroke, air forced by said piston from said crank-case through said air passageway into said air chamber and thence through said air ejecting port into said combustion chamber is impinged on by fuel mixture ejected by said piston from said crank-case through said mixture ejecting port and is thereby constrained to flow along the wall of the cylinder and form over the whole of said wall a lamina within which said ejected fuel mixture is contained.