DE596288C - Double-acting ring cylinder two-stroke internal combustion engine with a crank mechanism engaging in the center of the piston - Google Patents

Description

Double-acting ring cylinder two-stroke internal combustion engine with in the center of the piston attacking crank mechanism There are already double-acting ring cylinder two-stroke engines with hollow, cross-shaped annular pistons, in which the crank mechanism is switched off a crosshead guide engages the annular piston directly, became known. The scavenging air is generated in part by utilizing both piston shafts as a pump piston or by means of an attached double-acting scavenging air pump, with complicated diversions must be accepted and the advantage of the direct attack of the crank mechanism is lost on the annular piston.

The object of the invention now forms a double-acting two-stroke internal combustion engine with a hollow, cross-shaped annular piston, in which the crank mechanism is switched off of the cross head attacks in the center of the piston and in which the burned gases in the Direct current through purging air in the upper and lower piston position through radial offset exhaust slots - flushed out in the middle of the cylinder. The engine generates its scavenging air in a single-acting piston pump above the combustion cylinder itself and pushes the scavenging air through the hollow piston skirt and through radial slots into the combustion chamber. When the piston moves upwards, the flushing pump creates a vacuum, whereby a valve located in the upper hollow shaft is blocked.

The subject of the invention is shown in the drawing in one embodiment as a four-cylinder engine in elevation (Fig. i), in plan (Fig. a) and in side view (Fig.3).

In Fig. 3, the engine is in section in the uppermost piston position shown. The scavenging air reaches the radial antechamber through the scavenging air line i .2 and through radial slots 3 in the flushing pump cylinder q .. When the Piston 5 will immediately close the slots 3; the purge air passes through the radial piston slots 6 and the valve 7 in the hollow, cross-shaped piston 8, which can be in two parts for better accommodation of the piston pin 9.

In the upper and lower shaft of the piston 8 there are radial scavenging slots io through which the scavenging air in the end positions expels the burned gases in cocurrent through radially offset exhaust slots ii in the cylinder center 1z into the exhaust ring line 13 or exhaust line 14. The pump piston 5 is placed on the upper piston shaft 8 and fastened by a threaded nut 15. A cast-on cooling jacket 16 is used to accommodate the water jacket 17, which is connected to the water jacket 1a of the lower cylinder cover 19. For the unimpeded connection of the water jacket 17, outer walls 2o of the exhaust ring line 13 are arranged.

Fuel nozzles 21 spray in conjunction with one driven by the engine Fuel pump the finely divided fuel into cylinder 12. The Zvlinder 12 are by screws 22 with the crankcase upper part2g and the lower part2q. connected, and compensation holes 25 are inside the crankcase for the scavenging air arranged so that if the scavenging air pump piston is sufficiently dimensioned, its fuller The cross-section is effective, there is always a large reserve of purge air.

This new type of internal combustion engine is slightly larger in diameter than an engine of conventional design. The very small stroke, with a favorable expansion ratio stroke / ring width - 1.5, creates extremely high-speed runners. As a result, liter outputs of up to 80 HP and more are easily possible at moderate piston speeds and pressures.

Another advantage is the extremely low overall height, which in the Means only the fourth part of normal, double-acting motors with crosshead guidance so that the dead weight of the new engines is at least three times less are. The constant and extensive purging air cooling of the piston eliminates the inconvenient Oil or water cooling of the pistons of normal, double-acting internal combustion engines path. Furthermore, the ratio of the cooled cylinder areas in ring cylinder engines cheaper.

Claims (1)

PATENT CLAIM: Double-acting ring cylinder two-stroke internal combustion engine with a crank mechanism engaging in the center of the piston, in which the Purge air pump with a large piston diameter generates purge air through the hollow piston shaft in the upper and lower piston position by means of slots in the piston skirt into the Reaches combustion chambers and flushes them in cocurrent, characterized in that that the only single-acting flushing or mixture pump in the top dead center position Sucks in scavenging air through inlet slots controlled by the piston and this during downward gear of the piston into the hollow piston skirt through slots in the piston skirt wall and a valve located under these in the upper part of the piston shaft presses the is closed when the piston moves upwards.