US 6,065,432 A · Two-stroke engine operation method and internal combustion two-stroke engine

Abstract

The present invention relates to operation processes of two-stroke engines. A two-stroke engine uses a slide valve (10) so that the inlet-outlet passage (9) connected to the exhaust manifold (18) may be connected to the inlet pipe after the outlet of exhaust gases from the cylinder (4). A fresh load is then introduced into the cylinder (4) simultaneously through a scavenging port (6) connected to the crankshaft chamber (2) by a scavenging passage, and through an inlet-outlet port (8) connected to the inlet pipe. The crankshaft chamber (2) is filled when the piston (5) moves from the bottom dead center after the port (8) is opened at its lower edge. Practically continuous feeding of fresh loads into a single-cylinder engine can thus be achieved. The increase in the time-section ration of the gas distribution organs ensures maximum filling of the cylinder (4) while reducing the time therefor and the losses to a minimum. The heat, which is emitted at the surface of the hottest parts after the outlet, is instantaneously eliminated by the cold fresh loads passing therethrough.

Claims11

Dependent claims

A method of operating a two-stroke internal combustion engine, said method comprising the steps of:

compressing and combusting a fresh charge within a cylinder as a piston ascends towards a top dead centre;
expanding combustion products in the cylinder as the piston descends from the top dead center;
exhausting spent gases from the cylinder through an inlet-outlet port uncovered by an upper edge of the piston, an inlet-outlet passage and a slide valve to an exhaust pipe;
scavenging and filling the cylinder with a compressed fresh charge admitted through a scavenging port when the piston approaches a bottom dead centre, wherein when the piston is near the bottom dead centre the inlet-outlet passage is disconnected by the slide valve from the exhaust pipe and connected through the slide valve to the inlet pipe,
wherein prior to the filling of the cylinder, the fresh charge is admitted into a crankshaft chamber through the slide valve, the inlet-outlet passage and the inlet-outlet port uncovered by the lower edge of the piston ascending towards the top dead centre, the steps of scavenging and filling the cylinder being performed by passing the charge from the crankshaft chamber.

2 more elements

Dependencies are inferred from the claim text.

Two-stroke engine operation method and internal combustion two-stroke engine

Life of this patent

Two-stroke engine operation method and internal combustion two-stroke engine

Life of this patent

Abstract

Claims11