DE1776180A1 - Inlet and outlet ducts in internal combustion engines - Google Patents

Description

Patent attorney WpI.-Ina. P .. Beetz u. Dipl.-Ing. To ρ right

MQndMn 22. SielmdoffMr. 10 233-13.80OP-Zj? (6) SV

P 17 905.0-13 Tr.A.

13 Aug 1969 1776180

Inlet and outlet ducts in internal combustion engines

You invention relates to an inlet and outlet channel Internal combustion engines, which are curved to produce a rotational movement of the air or the fuel mixture in the combustion chamber are, in accordance with the sense of the curvature of the inlet duct to facilitate the outflow of exhaust gas from the Cylinder also the exhaust duct is curved in the sense of the rotation of the gases that has continued until then, with the two Channels open out on the same side of the cylinder head, or each channel opens out on a different side of the cylinder head.

Internal combustion engines with inlet and outlet ducts of the type explained at the beginning, in which the inlet and outlet ducts open out on different sides of the cylinder head 8, Bind from DAS 1 032 972 and US Pat. 3,331,359 known. Sine Internal combustion engine with the inlet and outlet ducts explained above, these ducts on the same side of the cylinder head, comes from the British Pat. 410 047 as known.

Also known are helically curved "S inlet ducts". With the well-known channels Bind, however, if special Intense turning movements of the fuel mixture or the intake combustion air should be retained so that Cross-section · narrowed in the area of the Yentilführung.Soloh «in · Yer narrowing then not only has undesired throttling and thus poorer volumetric filling in the Sinlalkanal, but

auoh «in«

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Slower exhaust gas flow out of the cylinders at the exhaust ports.

The invention is therefore based on the object both an intense rotating movement of the fuel mixture or the Combustion air as well as a good degree of filling and a high exhaust gas velocity when the exhaust gas emerges from the To enable cylinders.

This object is achieved according to the invention in that the middle part of the wall of the channels in the area of penetration with the hub of the valve guide after a ball or a Ellipsoid is curved, the center points of which in relation to the longitudinal plane of the cylinder head passing through the valve guide axis is one hatred for the intake port and the exhaust port are offset eccentrically.

An exemplary embodiment and a variant of the gas exchange channels designed according to the invention are given below described in the drawing. Show it:

Fig. 1 is a vertical section through the cylinder head in the level AA of the inlet or Auelaßkanal j

Pig. 2 a horizontal section through the cylinder head in the plane BB of the inlet and outlet channels;

Fig. 3 shows a vertical piston through the cylinder head in the plane OO of the inlet or outlet channel j and

fig.4 a horizontal section through the cylinder head in an alternative arrangement of the channels, which are on the opposite sides of the cylinder head flow out.

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In i'ig.1 the center point 1 of the-ugel 2, which determines the design of an essential surface part of the duct wall, lies in the axis of the valve guide, while in FIGS. 2, 3 and 4 it lies approximately within the plane passing through the two valve guide axes at the inlet duct by the dimension e * , and at the outlet duct by the dimension e ~ is off-axis. This eccentricity achieves a desired asymmetry of the ball position 2 in relation to the position of the inlet or outlet valve and the respective valve guide, from which it follows that the penetration contour of the fcabe 3 of the valve guide 4 with the ball 2 - as a gas guide surface with an appropriately selected and constant variable radius 5-rounded, has a decreasing tendency in the direction of the valve seat 6, so that in the circumferential area of the valve guide hub 3 there is a helical gas guide with a corresponding slope.

The steepness of this screw gas guide surface depends on the eccentricity size e .., or e ^, which is chosen so that a rectified flow of the medium through the channels with the smallest possible throttling of this Durcliströniung is guaranteed. This is achieved by an appropriately chosen spherical or ellipsoidal design as the starting element for the formation of the essential surface area of the helical gas guide of the channel, to which the opening 7 of the valve seat 6 and at the same time also the supply or outlet part b of the inlet channel 9 or respectively of the outlet channel 10 continuously.

Optionally, the inlet part of the inlet channel 9 is through the vertical plane 11, which the flow of the entering Medium to the spherical or ellipoidal part of the circumference, one-sided and steadily narrowing, whereby a rotary movement of the medium is initiated, which is caused by the already mentioned

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Design of the transition surface in a screwing motion changes.

The Auelaß Canal 10 is designed in a similar catfish, with the difference that the rotary movement of the exhaust gases flowing out of the cylinder in the initial part of this Channel is converted into a helical movement. The gradually increasing cross-sectional profile of the discharging outlet duct part, which is flattened on one side by the wall surface 12, facilitates the outflow of the Gases from the cylinder head.

The arrangement of the inlet and the Auelaß canals, which in principle are identical or at least similar, is due to the opposite direction of the flow of the gases in these canals. When both channels open out on the same side of the cylinder head, the exhaust port represents approximately a mirror image of the inlet port, specifically in relation to the transverse plane of the cylinder head between the two ports. Thus it is achieved that the outflow of the exhaust gases from the cylinder, the same rotary sense how the inflow and the rotational movement of the medium in the cylinder head, as also illustrated in Figure 2 by the line of curvature and the designated by corresponding arrows steady flow Ever run.

If both channels open out on the same cylinder head side in FIG. 2, they can also open out on opposite sides, as is illustrated as a variant in FIG. Then, of course, the arrangement of the two channels must be adapted accordingly so that when the medium flows out of the cylinder, the flow also flows into the outlet channel with the same "drainage direction" with which it enters the cylinder from the inlet channel.

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kicked. In this pail bind the two channels are no longer related symmetrical on the transverse plane lying between them, the position of the outlet channel results rather from that of the inlet channel approximated by a 180 ° rotation around the cylinder axis, but with the eccentricity dimensions as a form deviation e .. and Θ2 of the centers of the spheres are no longer both of the Valve guide axes in opposite directions or approximately radially outward with respect to the cylinder axis, but lie in the same direction from the valve guide axes.

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Claims (1)

O stalemate 3 inlet and outlet ducts in internal combustion engines, which are curved to form a rotary movement of the air or the fuel mixture in the combustion chamber, in accordance with the meaning of the curvature of the inlet duct to facilitate the exhaust gas outflow from the cylinder and the exhaust duct in the sense of the continuing until then Rotary movement of the gases is curved, the two channels (9,10) open out on the same side of the cylinder head (Fig.2), or each channel opens out on a different side of the cylinder head (Fig.4), characterized in that the middle part of the wall of the channels (9,10) in the area of penetration with the hub (3) of the valve guide (4) is curved according to a ball (2) or an ellipsoid, the center points (1) of which with respect to the axis of the valve guide going longitudinal plane of the cylinder head at the inlet channel (9) and at the Aualaßkanal (10) are each offset eccentrically by one hatred (e ^ or eg). 109840/0526 Blank page