JPS6234935B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vortex forming passage in an intake system of a reciprocating piston type internal combustion engine. the passageway is bent in the desired swirl-forming direction and has an intake valve located in the cylinder head, the swirl-forming passageway being curved into an S-shape connected to a helically bent passageway section; a guide passage section, the helical passage section being provided between the S-shaped curved guide passage section and the cylinder chamber, one of the S-shaped curved guide passage sections; of a passage cross-section extending parallel to the passage cross-section, the end point of which lies on the passage cross-section passing through the cylinder axis and the valve axis, and the other end point of which lies the opening of the guide passage section to the intake pipe; The spiral axis of the helical passage section is located above the passage cross section passing through the cylinder axis and the valve axis, and is eccentrically arranged with respect to the valve axis, so that the helical passage section is approximately constant. and a helical formation angle of at least 220° C. and a substantially constant spacing between the helical axis and the opposing passageway side wall; The end of the passage section facing the cylinder chamber opens into the cylinder chamber via a cylindrical valve-opening passage section.

A swirl-forming channel of this type consists essentially of three channel sections, starting from the cylinder of the internal combustion engine, the first channel section being a cylindrical valve opening channel section, which The channel section connected to the open channel section is designed as a helically wound channel section, and the channel section connected to this channel section is designed as an S-curved guide channel section. The guide channel section leading from the so-called deflection point to the so-called spiral point with such a channel configuration advantageously has a channel cross section that does not change over its entire length and has a helical channel section with the same cross section. is moving to. The helical channel section forming the connection section from the guide channel section to the inlet opening of the valve opening channel section also has an unchanged cross section. In this case the spacing from each side wall to the spiral point is the same or approximately the same. The valve guide and the walls of the guide passage adjacent to the valve guide are arranged so that, on the one hand, the helix point is located in the passage cross-section through the valve guide, and on the other hand, the guide passage can be brought hydrodynamically satisfactorily close to the helix point. A guide vane is provided between the two. This guide vane is connected at its root to the wall of the guide channel and at its tip to the valve guide. This guide vane limits the length of the helical passage section from the inlet to the valve opening passage. The air flowing through the channel is therefore forced by the guide vanes into the helical channel on the one hand and into the valve opening channel on the other hand.

The object of the invention is to start from such a passage, in particular a helical passage section, in which the air is particularly strongly pressed against one wall of the helical passage section, that is to say on the wall opposite to the opening of the valve opening passage. The object of the present invention is to improve the air flow so that the air reaches the cylinders of an internal combustion engine in a targeted manner and at a high velocity and with a strong turbulence.

This object is achieved according to the invention in that the cross section of the helical channel section is trapezoidal from the inlet to the valve opening channel.

Due to the trapezoidal configuration of the channel, in particular the helical channel section, the air is forced from the top side of the trapezoidal cross section to the bottom side of the trapezoidal cross section as it passes over both inclined surfaces or walls. In this case, this pressing force is likewise increased by the inclined guide surfaces of the trapezoidal guide vanes. In this way, the air is guided through the threaded surface, ie the trapezoidal base, and thereby into the valve opening channel which opens cylindrically into the cylinder of the internal combustion engine. Experiments have shown that a helical channel section configured in this way provides a very good swirling flow. This vortex therefore results in very good mixing between the fuel and the combustion air.

According to a further embodiment of the invention, the bottom surface of the trapezoidal cross section is located opposite the opening of the valve opening channel.

In order to avoid bottlenecks in the helical section of the passage, the central region of the side wall of the trapezoidally configured helical passage section is inclined towards the valve opening passage.
They have the same or approximately the same spacing from the sidewalls to the helical axis.

The invention will now be explained with reference to the drawings: The passage according to the invention is formed from approximately three passage sections. One of these three passage sections is connected to the cylinder of the internal combustion engine and is designed as a valve opening passage section 3.
A helical passage section 4 connected to this valve opening passage section 3 is arranged between the valve opening passage section 3 and a guide passage section 5 connected to the helical passage section. The end of this guide channel section 5 opposite to the helical channel section opens into the intake pipe 15 .
Passage cross section K passing through cylinder axis X and valve axis V
and a passage cross-section parallel to the passage cross-section K, in which the guide passage section 5 opens into the intake pipe 15.
The guide channel section 5 located between K' is preferably curved in an S-shape and passes from a circular or square cross section to a trapezoidal cross section of the helical channel section 4. . The helical passage section 4 is trapezoidally configured from its inlet to the valve opening passage section 3, the bottom surface 16 of the trapezoid being located opposite the opening of the valve opening passage section 3. side wall 1
8 and 19 as well as a bottom surface 16 and a top surface 17 facing this bottom surface, the trapezoidal passage section 4 is arranged inclined toward the valve opening along a spiral with a constant slope and is arranged inclined towards the valve opening. The guide vane 7, which connects the guide 9 with the wall of the guide channel section 5, likewise has a guide surface that is inclined towards the valve opening channel section 3. The helical axis Y of the helical passage section 4 is offset from the central longitudinal axis of the valve, ie from the valve axis V, by a distance a. The helical channel section is therefore wound around this axis towards the valve opening channel section 3. Side walls 18, 19 of the helical passage section
In order to make it easier to understand, this is indicated by hatching in FIG. Due to this embodiment of the helical channel section 4, the air 20 passing through it is influenced by the laterally inclined walls 18, 19 to the bottom surface 1 of the trapezoidal channel cross section.
It is forced against 6. This gives the air an extremely strong vortex. The point of deflection of the channel 1 is also located on the straight line E in this embodiment, so that the air 20 passing through the channel 1 is guided by the helical channel section 4.
By the shape given to the valve opening passage section 3
be introduced within. In this valve opening channel, the air continues to be guided by the cylinder wall in a swirling state. The distance b from the side wall 18 to the helical axis Y is the same or approximately the same if the inclined position of the side wall 18 is considered. In this case, this distance is preferably measured in a suitable central region 21 of the side wall 18.

After considerable experimentation with the passage of the invention, it has been found that it is advantageous for the cross-section of the trapezoidal passage section 4 to be approximately 10 cm ² per liter of stroke volume in order to obtain the desired swirling conditions. Of course, this value can be varied proportionally to these values, depending on the size and power of the engine.

In one embodiment of the passageway shown in FIG.
At its end facing the helical channel section 4, the S-shaped guide channel section 5 is likewise trapezoidally designed. In this case, the bottom surface 16 of the cross section is S
Already at the transition between the curved guide channel section 5 and the helical channel section 4 it begins to slope.
This slope is skewed to α as shown in FIG. This helix formation angle α must be at least 220° in order to provide the air supplied to the cylinder 2 with a sufficient swirling state.

[Brief explanation of the drawing]

The drawings show one embodiment of the invention,
FIG. 1 shows the second helical passage section of the passage of the present invention.
FIG. 2 is a cross-sectional view taken along line - in FIG. 1, and FIG. 2 is a cross-sectional view taken along line - in FIG. 1... passage, 2... cylinder, 3... valve opening passage section, 4... spiral passage section, 5... guide passage section,
7... Guide vane, 9... Valve guide, 14... Deflection point, 15
...Intake conduit, 16...Bottom surface, 17...Top surface, 18,1
9...Side wall, 20...Air, 21...Central range.

Claims (1)

[Scope of Claims] 1. A vortex forming passage in the intake system of a reciprocating piston internal combustion engine, where the vortex forming passage is desired in order to impart rotational motion to a gaseous medium passed through the vortex forming passage. a passage section 4 which is bent in the direction of vortex formation and has an intake valve located in the cylinder head, the vortex formation passage being helically bent, and a guide passage connected thereto which is curved in an S-shape; a helical passage section 4 is provided between the S-shaped curved guide passage section 5 and the cylinder chamber; for said passage cross-section K, one end point of which lies on said passage cross-section K passing through the cylinder axis X and the valve axis V, and the other end point of which lies the opening 15 of the guide passage section 5 for the intake pipe. The spiral axis Y of the helical passage section 4 lies on a passage cross section K, which runs parallel to the cylinder axis eccentrically arranged, the helical channel section 4 is arranged along a helix having a substantially constant slope and a helix forming angle α of at least 220° C. and facing the helical axis Y; The end of the helical passage section 4 facing the cylinder chamber opens into the cylinder chamber via the cylindrical valve opening passage section 3. Swirl-forming channel of the type characterized in that the cross-section of the helical channel section 4 from the inlet to the valve opening channel section 3 is trapezoidally configured. 2. Swirl-forming channel according to claim 1, wherein the base of the trapezoidal cross section is located on the opposite side of the opening of the valve opening channel section 3.