F - Mech Eng,Light,Heat,Weapons – 02 – B
Patent
F - Mech Eng,Light,Heat,Weapons
02
B
171/29
F02B 75/24 (2006.01) F01B 9/04 (2006.01) F01B 11/00 (2006.01) F02B 33/06 (2006.01) F02B 71/04 (2006.01) F02B 75/02 (2006.01)
Patent
CA 1152004
ABSTRACT TITLE: INTERNAL COMBUSTION ENGINE From one aspect the invention is a reciprocating piston internal combustion engine comprising a piston axially slidable in a cylinder to define between them a combustion chamber and characterised by a scavenging plate disposed in the combustion chamber and axially movable therein to expel combustion gases from the chamber. In one embodiment the engine is a two stroke engine and the scavenging plate acts as a free piston. The scavenging plate may be arranged to be retained against the cylinder head during the power stroke of the piston and to be released for axial movement in the combustion chamber towards the end of the power stroke, and movement of the scavenging plate away from the cylinder head may be by means of compressed gas which forms the fresh charge of fuel for introduction into the combustion chamber, the scavenging plate being provided with a one-way valve through means which the fresh charge passes to enter the combustion chamber proper. The engine may comprise an oscillating disc inlet valve mounted for rotation on a rod which engages a cam track on the piston rod so that reciprocation of the piston rod causes oscillating rotation of the inlet valve disc. In another embodiment the piston head is axially movable in the cylinder relative to the piston body to assist expulsion of combustion gases. From another aspect the invention is a reciprocating piston machine comprising a main piston secured to a piston rod, a cylinder in which the piston can slide, the piston and cylinder defining a chamber, and characterised by one or more subsidiary pistons fixed on the piston rod below the main piston and slidable in cylinders defining pumping chambers by means of which gas can be forced into the chamber above the main piston at super-atmospheric pressure. The pumping chambers of the subsidiary pistons may communicate with an intermediate chamber disposed above the main piston. One or more of the sub-pistons may be arranged to pump a liquid, and the swept volume of the liquid pumping cylinder may be relatively small as compared with the swept volume of the main piston cylinder. The piston rod may be connected to drive an output shaft by means of a sector pinion, and the mating teeth of the sector pinion may be resilient, e.g. of a textiles reinforced elastomer. The engine may comprise an opposed pair of main pistons secured to opposite ends of coupled piston rods.
344505
Fromson Bertram W.
Gowling Lafleur Henderson Llp
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