DE409919C - Two-stroke internal combustion engine with two opposing cylinders - Google Patents

Description

Two-stroke internal combustion engine with two opposing cylinders. Two-stroke internal combustion engines are known in which the fuel-air mixture is sucked into the crankcase and compressed in this. With such engines the lubricating oil in the bearings of the crankshaft is decomposed by the fuel and thus unusable after a short time. In addition, two-stroke engines are also known, in which there is one located on the piston crown for the inlet, and even a second one on the upper piston head arranged special valve must be provided because a Flashback of the fuel-air mixture into the crankcase during precompression of the mixture must be prevented. In addition, such pistons work by means of Connecting rods to the crankshaft, which gives the engine a relatively long time Design as well as unfavorable vibrations due to the moving masses.

The invention is a two-stroke internal combustion engine with opposite Cylinders, in which the individual parts known per se in such a Association work together that an overall impact is achieved that is significant goes beyond the individual effects of the various components. So z. B. that Crankcase in no way interacts with the adverse mixture neither directly still indirectly in contact brought, therefore remains completely pure and the constantly changing mixture flows do not reduce its service life in any Way diminished.

Another advantage is the omission of any valve - especially of the inlet valve; the channels required are in the middle Relocated part of each cylinder - thereby greatly simplifying the engine in terms of moving parts and control is achieved. Neither connecting rods nor Eccentrics, springs, valve plates and the like are provided, as are the additional work associated with the use of these parts, e.g. B. of grinding in, replacing, checking, etc. Instead of all these organs, simple, Inlet slots provided in the engine cylinder, which are relatively narrow, however are kept very long and therefore for a fast runner (about 3ooo to 4ooo turns for 1 minute) are suitable. After all, the engine has a very compact design, because the vibrating connecting rods are no longer needed and this one is used instead Slider crank is used, which forms a rigid whole with the piston. Even this training causes the motor at the high speeds on the one hand the the required stability and, on the other hand, a smooth, shock-free gait is provided, These important advantages allow the engine to be used primarily as a Bicycle engine or also as a small car engine, in which vehicles relatively There is little space available for the motor because of the other accessories.

The novelty of the invention is that the pump chambers in which the fuel-air mixture is pre-compressed, is shut off from the crankcase, that the inlet for the pump chambers and the overflow and exhaust duct from the piston are controlled and. that the transfer of the piston movement to the rotating Crankshaft takes place by means of a crank loop.

In the drawing, an embodiment of such a verb is internal combustion engine in Figs. i and 2 in longitudinal section, but offset by 90 °, and in Fig. 3 are the Operations indicated schematically.

With a, the opposite cylinders are referred to in a known manner, which are closed against the crankcase by bottom-like stuffing boxes c, so that the front spaces of the cylinders a are completely separated from the crankcase. With d, the known transfer channels are referred to, which from the lower End of the cylinder starting in the middle of the latter in the plane of the channel f open, which latter is opposite the Einmüridungsstelle and the exhaust port for the burned gases. The suction slot e is also iii the center of each Zvlindersa so that it only opens at the end of the inward stroke will. Of the other channels, the exhaust channel f is opened earlier than the mouth of the overflow channel d. The webs bl on the piston crown, which are also known per se b prevent the fuel-air mixture from spreading immediately in the explosion room. Rather, they lead the mixture in the explosion chamber to the cylinder head while the burnt gases emerge from the opening f. This piston position show the Fig. 2 and 3 on the right. The explosion in the right cylinder the piston moving to the left compresses the sucked-in fuel-air mixture (s. Piston position of the right cylinder in Fig. 3). It opens simultaneously or briefly one after the other the exhaust duct f and the overflow duct d. The exhaust gases will be due to the pre-compressed, inflowing fuel-air mixture completely out of your Cylinder flushed, the channels being kept very wide and narrow.

The returning piston closes channels d, f, compresses the fuel-air mixture again and at the end of this piston stroke sucks in mixture again through channel d. In addition, the piston rods attack a loop g in which the bearing h for the rotating crank k slides so that the connecting rods are omitted, there are no moving parts inside the piston and crankcase and the overall length of the engine is very short.

Claims (1)

PATENT CLAIM: Two-stroke combustion engine with two opposite one another Cylinders, characterized in that the pump chambers in which the fuel-air mixture is pre-compressed, are shut off by the crankcase so that the inlet to the pump chamber, the overflow and the exhaust duct are controlled by the piston and that the transmission the piston movements on the rotating crankshaft by means of a crank loop he follows.