SU62306A1 - Two-stroke pre-chamber engine Diesel dual action - Google Patents

Description

Known two-stroke pre-chamber diesel engines of double action, equipped with a fixed piston septum. This partition divides the cavity inside the working piston into two parts — the working and the compressor.

The described engine is of the type of the above-mentioned engines, but differs from them by a special pre-chamber device. The latter is made movable in the direction of the cylinder axis and at the same time serves as a spool that communicates alternately its (prechamber) cavity with the compressor cavity inside the working piston, then with the nozzle inside the fixed piston partition, or with the working cavity inside the working piston.

The drawing schematically shows the engine in longitudinal section.

The cavity of the engine cylinder 4 is divided into two parts by a fixed piston septum 75, inside of which is a pre-chamber 6 with a spring-loaded rod 14. The partition is supported by a hollow rod 5 inserted inside the cylinder. The same partition divides the cavity inside the working piston also into two parts - working and compressor.

Air into the pre-chamber cavity 8 is injected from the upper part of the piston-cylinder 2 through the opening 9, the automatic valve 0 and the opening 21. The fuel is injected into the prechamber by the nozzle / 7. located inside the fixed piston septum. The latter is cooled through a rod (not shown in the drawing).

The master cylinder 4 operates in a two-stroke cycle and has a continuous purge through the window 7 and the valve /. The lower part of the piston of cylinder 2 also operates in a two-stroke cycle with continuous purging through inlet ports 12, 12a with exhaust ports 13, I, 20. In the fixed bulkhead there is a nozzle 19, the opening of which at known moments coincides with the window 18 of the prechamber 6. Through the nozzle 19, the gases are transferred from the prechamber to the lower part of the piston of the cylinder.

No. 62306

Engine performance is as follows. When the piston of the cylinder 2 moves up in the lower working part of the piston of the cylinder, air is compressed. All windows are closed. At that moment, when the piston-cylinder passes upwards approximately 0.8 of its stroke, the chamber 6 is lowered to such a position that its window 18 coincides with the nozzle 19. At the same time, the opening 5 / is closed by the pre-chamber. As the piston moves further, air from the lower part of the piston-cylinder is distilled into the prechamber through nozzle 19. At the end of the stroke of the piston-cylinder 2, windows 22 and 16 are aligned and the air supplied by the Ruth supercharger enters the upper compressor part of the piston. Then, using nozzles 5 and / 7, fuel is injected into cylinder 4 and into the prechamber. A working stroke occurs and the piston-cylinder begins to move downward. In the upper part of the piston-cylinder, air is compressed, windows 7, / 5 are opened. // and 20. Following this, the pre-chamber 6 is raised to the position indicated on the drawing (initial). Thereafter, the inlet flush ports 12, 12a and the valve / open. The air from the upper compressor part of the piston-cylinder through the valve W and the hole 21 passes into the pre-chamber. Then, the piston-cylinder 2 at the end of the purge begins to move upwards and the cycle of the engine is repeated.

Subject invention

Two-stroke dual-chamber pre-chamber engine with a fixed piston partition dividing the cavity inside the working piston into two parts - working and compressor, characterized in that the pre-chamber is movable in the direction of the axis of the cylinder and simultaneously serves as a valve that alternately communicates the cavity of the pre-chamber with the compressor cavity inside working piston, then with a nozzle inside a fixed piston septum, then with a working cavity inside the working piston.