Two-stroke diesel engine

Abstract

The invention relates to a two-stroke diesel engine. The two-stroke diesel engine comprises a cylinder sleeve, an exhaust pipe and a piston and is characterized in that a gas inlet pipe is arranged outside the cylinder sleeve, fresh air with certain pressure exists in the gas inlet pipe, the gas inlet pipe is communicated with a gas inlet on the cylinder sleeve through a gas inlet channel, and a gas inlet valve opening on the gas inlet channel is provided with a gas inlet valve which can open and close the gas inlet valve opening; an exhaust valve is opened and waste gas is exhausted before the piston moves down to a position at which a piston ring is close to the upper edge of the gas inlet; the gas inlet valve is opened, pressing of the fresh air is conducted and the waste gas is discharged further, when the piston continues to move down to the gas inlet and the piston is communicated with the inner cavity of the cylinder sleeve on the upper portion of the piston; and before the piston moves up and the piston ring is close to the upper edge of the gas inlet, the exhaust valve is closed firstly and the gas inlet valve is closed later. The gas inlet valve which is arranged at a position of the gas inlet channel is provided with the gas inlet opening. Even though the piston is far away from the gas inlet during the moving process, no fresh air leaks into a machine cavity on the lower portion through the gas inlet, the piston is not required to be lengthened and can moves a position which is far away from the gas inlet, and the stroke of the piston is increased greatly.

Description

technical field [0001] The invention relates to a diesel engine, in particular to a two-stroke diesel engine. Background technique [0002] Diesel engines are divided into four-stroke diesel engines and two-stroke diesel engines according to the stroke. The two-stroke diesel engines currently in use mainly have two structures: one is back-flow scavenging, and the other is direct-flow scavenging. [0003] The characteristic of backflow scavenging is that there is no valve device and the structure is simple. Such a diesel engine structure is disclosed in the Chinese invention patent "Exhaust Valve Type Two-stroke Diesel Engine with Supercharged Cross-flow Scavenging" as a patent No. ZL02140885.8 (publication number is CN1415846A). But because the structure of backflow scavenging is that the intake and exhaust ports are provided with the intake and exhaust ports on the side of the cylinder liner barrel, one side advances and one side exhausts. This structure will cause part o...

AI Technical Summary

Problems solved by technology

The disadvantages of this are: First, if a long-stroke diesel engine is to be designed, the piston must be very long

Second, because the upper end of the piston itself has a piston ring, and the lower end has a piston ring, the resistance increases when the piston moves up and down, the fuel consumption is high, and the wear and tear increases.

Not economical for practical use

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