DD147386A2 - DIESEL BURNING MACHINE WITH PISTON MOUNTED BALL SPACE - Google Patents

Abstract

The invention relates to a diesel engine with arranged in the piston ball-like combustion chamber with spout and eccentric Einspritzduese whose beam is directed in the direction of air vortex, in design gemaesz the PS 101941. Should be achieved high load capacity and favorable consumption even at increased Verdichtungsverhaelnis to about 20: 1 that limits blue smoke and pollutant emissions at start and idle. It is solved the task to change the Einroemverhaeltnisse the combustion chamber so that the swirl number becomes excessive even at high compression nivht. According to the invention, in the plane of the piston crown, the combustion chamber opening is designed to be approximately equal or up to 5% smaller than the maximum diameter of the spherical contour of the combustion chamber and an opening contour narrowed towards the combustion chamber center is provided with a gap between 8 degrees and 15 degrees.

Description

Title:

Diesel engine with a ball-like combustion chamber arranged in the piston

Field of application of the invention:

The invention relates to a diesel engine with arranged in the piston ball-like combustion chamber with a spout and eccentrically arranged injection nozzle, the beam is directed in the direction of the inlet vortex, in the embodiment according to DD-P 101 94-1 »wherein the longitudinal axis of the combustion chamber opposite to the cylinder axis parallel the spout, however, the axis of the combustion chamber opening is offset to the spout and forms the beam projection in the plan view of the combustion chamber with the tangential inlet contour, starting from the spout, an acute angle. The combustion chamber is generally sized so that almost the entire charge is compressed in it and does not affect the flow conditions of the charge through the inlet opening on the combustion chamber ·

Characteristic of the known technical solutions:

The diesel engine shown in the above section is previously known from DD-PS 101 941. In high-speed diesel engines of this type, with a relatively low cylinder volume of less than 600 cm, this solution provided optimum values in terms of load capacity and low consumption at compression ratios of 1:16

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until 1:17. - -

The behavior of this design in terms of consumption and load capacity, based on a certain allowable Abgastrübung, with an increase in the compression significantly over the above values with a corresponding proportional reduction of the combustion chamber dimensions to increase the process temperature levels in the combustion chamber proved to be disadvantageous. "The increase in compression is a common Development direction for reducing the blue smoke during the starting process and during idling and generally for reducing the aldehyde emission

Attempts have also been made to counteract the blue smoke during the starting process and during idling by forming the combustion chamber with tear-off edges (see DEAS 1 526 316) or also with thermal insulation of the combustion chamber using ceramic materials (see DE-OS 1 802 483). ,

The aforementioned measures brought more or less large reductions in the blue smoke, but always resulted in deterioration of the engine characteristics.

Object of the invention:

In the diesel engine of the type described and the DD-P 101 941 a high load capacity and a favorable consumption is to be achieved despite increased compression ratio, this being done in particular by influencing the inflow conditions at the combustion chamber opening.

Statements of the essence of the invention:

The invention has for its object to provide in the above-defined diesel internal combustion engines, even at increased compression favorable inflow, especially at the combustion chamber opening of the ball-like combustion chamber, which ensures a Luftwirbel speed, which ensures optimal Gemischbildungs- and combustion conditions. The combustion chamber should be interpretable up to a total compression ratio of 1:20.

According to the invention this object is achieved in that in the plane of the piston crown, the combustion chamber opening without the Schnaupenaussparung is about the same or up to 5% smaller than the maximum diameter of the ball contour des.Brennraumes and after the combustion chamber center out narrowed opening contour a slope between the 8th ° and 15 °. Preferably, the axis of the combustion chamber opening should have an offset in the direction of the spout from the cylinder axis, which is 80% to 100% of the size of the offset of the longitudinal axis of the combustion chamber from the cylinder axis in the opposite direction of the spout. With the design and position of the combustion chamber opening according to the invention, the ratio between the largest combustion chamber opening and the piston surface is more favorable and thus also the disturbing influence of the large squish intensity on the swirl flow in the combustion chamber largely eliminated. In addition, compared to the combustion chamber design according to WP 101 941, the more pronounced penetration contours between the two spatial body combustion chamber opening and Brennraumkugelkalotte advantageous to the mixture formation and the combustion process ·

Embodiment of the invention:

Reference to a drawing, an embodiment of the invention will be explained below. Show it:

1 shows a section through the inventively designed combustion chamber along section line A-A in Fig. 2nd

FIG. 2 is a plan view of the piston crown showing the combustion chamber opening and the projection of the spherical contour of the combustion chamber below

3 is a sectional view of the combustion chamber according to the section line BB in Fig ^.: 2.

FIG. 1 shows a cross section through the combustion chamber according to the invention in the piston. In the plane 1, the piston crown extends, with the combustion chamber 2 opening into its combustion chamber opening 3. This combustion chamber opening 3 is approximately

16731 -4-

equal to or up to 5% smaller than the maximum diameter of the spherical contour of the combustion chamber 2 and narrows with a slope 33 from 8 ° to 15 ° to the combustion chamber center (see Fig. 2 and 3).

The fuel injection nozzle - not shown directly - is arranged eccentrically, wherein the beam 4-1 in the direction of the air vortex at an acute angle from the outgoing from the spout 31 inlet contour 32 · The spherical part of the combustion chamber 2 has a longitudinal axis 5, the opposite the cylinder axis 6 is arranged with an offset a. The axis 7 of the combustion chamber opening is in turn provided with an offset b to the cylinder axis 6. This offset extends from the cylinder axis 6 in the direction of the fuel injector and spout 31 * while the offset a to the opposite of the cylinder axis 6 extends. The offset a is 3% to 7% of the maximum combustion chamber diameter, wherein the offset b is to be sized advantageously in a size of 80% to 100% of the offset a. For a 90 mm cylinder engine, the offset a was 1.5 mm and the offset b was 1.3 mm. smaller with a diameter of 32.5 mm.

The arrangement according to the invention eliminates a disadvantageous increase in the swirl in the smaller combustion chambers for higher compression ratios.

Claims (2)

Invention claim: 1 · Dieselbrennkraftmasctiine arranged in the piston ball-like combustion chamber with spout and eccentrically arranged in the cylinder injection nozzle, the beam is directed towards the intake vortex, wherein the longitudinal axis of the combustion chamber with respect to the cylinder axis parallel to the spout, but the axis of the combustion chamber opening is offset to the spout and while the Strahlproöektion in plan view of the combustion chamber with the tangential inlet contour, starting from the spout forms an acute angle according to DD-P 101 941, characterized in that in the plane (1) of the piston head, the combustion chamber opening (3) without the Schnaupenaussparung is approximately equal to or up to 5% smaller than the maximum diameter of the ball contour of the combustion chamber "(2) and an opening contour which is narrowed towards the center of the combustion chamber has a bevel (33) between 8 ° and 15 °. 2. Diesel engine according to item 1, characterized by in that the axis (7) of the combustion chamber opening (3) has an offset (b) in the direction of the spout (31) from the cylinder axis (6), which amounts to 80% to 100% of the offset (a) of the longitudinal axis (5) of the combustion chamber ( 2) of the cylinder axis (6). in the opposite direction of the spout (31) is * To do this, 1 soap drawings