DEST006019MA - - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

Registration date: February 25, 1953. Advertised on September 20, 1956

GERMAN PATENT OFFICE

The invention relates to a four-stroke internal combustion engine with a crankcase pump and two cylinders each cooperating with the crankcase pump, in which the pistons of both Cylinder at the same time reach the top or bottom dead center and the sucked in mixture is alternately fed to the respective cylinder to be filled.

There are internal combustion engines in designs

to various types known in which the fuel mixture passed through the crankcase will. The mixture feed through the crankcase is for cooling the crankcase of the Motor drive advantageous and allows an increase in the compression ratio, whereby a further increase in engine performance is achieved. Many of these for two-stroke engines The mixture feed to the combustion chamber that is used has also already been used in four-stroke engines has been, the charging is done by crankcase pumps. Other engines where the intake flow is fed to the crankcase via a rotary valve controlled by the crankshaft will have a mixture feed through the hollow crank pin to one at each Turn once to open the suction valve. Such suction processes result in filling losses and thus lower engine performance. As-

609 619/221

Claims (1)

St 6019Ia / 46a ⁹ the other four-stroke combustion engines control the gas mixture through rotary valves to the crankcase in connection with a control by the lower edge of the piston. Also in this case step significant filling losses. Finally, there is a control of the gas flow to the crankcase known by rotary valve arranged on the camshaft in four-stroke combustion engines the inside of the crankcase for two cylinders each ίο is united in such a way that both pistons together make the Suck fuel mixture into the crankcase. When the pistons go down to the bottom dead center the aspirated double the stroke volume is then applied to one or the other cylinder forwarded. The rotary valve is combined with the camshaft. : According to the invention, in such a four-stroke internal combustion engine the inlet to the crankcase is controlled by two rotary valves, which are located at the two ends of the camshaft, wherein the fresh mixture is fed into the camshaft chamber through an inlet duct. In the drawing is in schematic representations in Fig. Ι shows the open crankcase and a section through a cylinder, the Intake channels 1 and 2 and the overflow channel 7 for a better understanding, in contrast to Fig..2, have been relocated to the cut; Fig. 2 shows a plan view of the cylinder seat surface of the crankcase with a partial horizontal section through the center of the camshaft chamber is laid. The process is as follows: The gas mixture passes through the intake duct 1 in the cylinder (Fig. 1) through the feed line 2 in the crankcase into the camshaft chamber 3. The camshaft 4, which is equipped with four cams for the two-cylinder engine, carries on both of them Ends the rotary valve ^ and 4 _b (Fig. 2). The camshaft is therefore located in its entire length and with its valve tappet pressure points in the intake flow. The rotary valves \ _a and 4 _{b have milled grooves 5 fl} , 5 _& , 5 _C , 5 _rf in their round valve body, whereby a connection is made twice between the camshaft chamber 3 and the crankcase interior during one camshaft revolution. For this purpose there are slots 6 _a and 6 ₆ in the crankcase. During the downward movement of the piston, during which work cycle the slots 6 _a and 6 _b are closed by the rotary valve, an inlet valve opens and the piston in question sucks in the gas mixture. At the same time, however, the mixture located inside the crankcase is also pressed through the overflow channel 7 into the combustion chamber 8. This enables good flushing of the combustion chamber and a relatively high level of overloading, with, on the other hand, simultaneously connected with heat dissipation from the interior of the crankcase. With this operation, when using a gasoline-oil mixture, a lower dosage of the oil is possible compared to the previously usual method, since the oil reaching the cylinder walls is only burned with every second piston stroke. The cylinder walls are evenly wetted with oil over the entire running surface, in contrast to the cylinder strip found in two-stroke engines, which is located on the exhaust slot side and is always kept relatively dry by the combustion process. All the control parts in the crankcase are also supplied with plenty of lubricant from the gasoline-oil mixture. Likewise, the lubrication of the engine and control mechanism is carried out in a known manner an oil pump possible. In this case, a pure fuel-air mixture is used for operation and the excess oil is sucked off again after the dry sump lubrication system and returned to the oil container pumped back. PATIiNTAXS PRUCII Four-stroke internal combustion engine with two cylinders and a crankcase pump, in which the pistons of both cylinders reach top and bottom dead center at the same time and the sucked-in mixture is fed to the cylinder to be filled, characterized in that the inlet into the common crankcase is through two rotary valves (4 _fl , 4 _b ) , which are located at the two ends of the camshaft (4) and are combined in a known manner with the camshaft (4), and that the fresh mixture through an inlet channel (2) into the camshaft chamber (3) . is directed. Considered publications:
German Patent No. 734 142;
Swiss Patent No. 154282;
British Patent No. 680 357. 1 sheet of drawings