DE2641217C3 - Piston internal combustion engine, in the cylinder wall of which outlet slots are provided - Google Patents

Description

The invention relates to a piston internal combustion engine which has a piston which is movable in a cylinder has, wherein outlet slots are provided in the cylinder wall for the outlet of the combustion gases, which are distributed over an area of the cylinder circumference and are connected to an outlet receiver.

Particularly in engines with transverse scavenging, this occurs as a result of the asymmetrical relief of the piston crown and the piston ring gaps when passing over the outlet slots a piston transverse force, which adversely affects the piston movement in the cylinder.

The aim of the invention is to remedy this disadvantage.

This line is achieved according to the invention in that over one of the area essentially diametrically opposite area of the cylinder circumference auxiliary outlet slots are distributed, which with a Expansion tanks are connected.

This achieves a significant reduction in the piston transverse force, although the energy which is contained in the combustion gas is retained and can be fed to the turbocharger.

The invention is explained in more detail on the basis of exemplary embodiments in conjunction with the following Drawing. It shows

1 shows a longitudinal section of a cylinder of a reciprocating internal combustion engine,

F i g. 2 shows the section along the line H of FIG. 1,
3 shows a corresponding section through several cylinders arranged next to one another with an expansion tank and outlet receiver,

4 shows a corresponding section through a another embodiment, wherein the expansion tank is connected to the outlet receiver,

5 shows a corresponding section through a further embodiment, with different cylinders

Ό are connected to different expansion tanks, Fig. 6 shows a diagram of the pressure curve in the cylinder and in the expansion tank as a function of the crank angle
and

7 shows a schematic representation of the piston positions in the cylinder at the crank angles shown in Figure 6.

A cylinder jacket 1 (Fig. 1) is provided with a cylinder insert 2 provided. This has outlet slots 3 and flushing slots 4. In addition, there are auxiliary outlet slots 5 intended. The cylinder jacket 1 has a connection channel 6 to the outlet receiver 10 (FIG. 3). A connection channel 7 to the expansion tank 11 is also provided. The flushing slots 4 is a Associated with connecting channel 8 A cooling water channel is denoted by 9

According to one embodiment of the invention, several cylinders lying next to one another are connected to a common expansion tank 11 (FIG. 3). The respective cylinders 2, 2a and 2b are connected to the outlet receiver 10 via the connecting channels 6, 6a and 66 and are connected to the expansion tank 11 via the connecting channels 7, 7a and Tb. The direction of gas flow from the outlet receiver 10 to the turbocharger (not shown) is indicated by the arrow 12

According to another embodiment of the invention, an expansion tank 15 (Fig. 4) is above a Connecting line 13 with a throttle point 14 with the outlet receiver 10 in connection. By means of this Device can thus adjust the gas pressure in the expansion tank 15 to an optimal level. In order to compensate for any pressure interference between different cylinders, at least a diaphragm 16 can be arranged between different cylinders.

According to a further embodiment of the invention, different cylinders are different Expansion tanks 17, 18 (Fig.5) connected. One The cover 19 is also arranged in the expansion tank 17.

An example of the pressure curve in the cylinder and in the expansion tank 11 is shown in the diagram according to FIG. 6 illustrates. The abscissa axis denotes the crank angle λ and the ordinate axis denotes the pressure ρ in the cylinder or in the expansion tank 11. The crank angle at the bottom dead center of the piston is denoted by UTP on the abscissa axis. The curve 20 shows the pressure curve in the cylinder and the curve 21 the pressure curve in the expansion tank 11. The corresponding approximate piston positions are shown schematically in FIG. At the crank angle the piston control edge is located in the vicinity of the outlet slots 3 and auxiliary outlet slots 5 (FIG. 7).

In this case, the cylinder pressure is pi and the pressure in the expansion tank is p \. At the crank angle & i , the exhaust ports become 3 and the auxiliary exhaust ports

opened, whereby the pressure in the expansion tank 11 gt and at the crank angle 3 its maximum value pi 5icht. As the piston moves further downwards, the scavenging slots 4 and the curves 20 and 21 run approximately parallel until at the crank angle α pressure equalization in the cylinder and in the expansion tank 11 takes place. The pressure in the cylinder and in the expansion tank is then the same up to the bottom dead center UTP. The height of the highest point fa) of curve 21 depends on the volume of the expansion tank and decreases with increasing volume of the same.

In addition 6 sheets of drawings

Claims (7)

Patent claims: 1. Piston internal combustion engine, which has a piston movable in a cylinder, wherein in the Cylinder wall for the outlet of the combustion gases are provided, soft over a Area of the cylinder circumference are distributed and connected to an exhaust receiver, thereby characterized in that one of the region is substantially diametrically opposite Auxiliary outlet slots (5) are distributed around the circumference of the cylinder, soft with an expansion tank (11,15,17,18) are connected. 2. Piston internal combustion engine according to claim 1, characterized in that the auxiliary outlet slots (5) are distributed over the remaining part of the cylinder circumference. 3. Piston internal combustion engine according to claim 1, characterized in that the expansion tank (ll, 17:18) is closed 4. Piston internal combustion engine according to claim 1, characterized in that the expansion tank (15) with the outlet receiver (10) via a connecting line (13) with a throttle point (14) connected is 5. Piston internal combustion engine according to claim 1, characterized in that C ¹ Ie auxiliary outlet slots (5) of different cylinders with different expansion tanks (17,18) are connected. 6. Piston internal combustion engine according to claim 1, characterized in that the auxiliary outlet slots (5) of various cylinders are connected to a common expansion tank (it) . 7. Piston internal combustion engine according to claim 1, characterized in that the expansion tank d * r (15, 17) is provided with at least one diaphragm (16, 19)