DE2321577A1 - COMBUSTION MACHINE - Google Patents

Description

Dr. Ing.b.c. F. PORSCHE AKTIENGESELLSCHAFT ■ 7 STUTTGART-ZU FFENHAUSEN · FORSCH ESTRASSE42

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Internal combustion engine

The invention relates to an internal combustion engine with a Combustion space that is delimited by a cylinder head surface and the end surface of a piston.

There are internal combustion engines with combustion chambers of the aforementioned Kind of known in which to achieve better combustion in the area above the top piston ring of the Piston is convex or chamfered in this area. This has proven to be insufficient, in particular, since a significant improvement in HC emissions could not be achieved as a result.

The object of the invention is to provide a combustion chamber for To create internal combustion engines through which the HC emissions can be significantly reduced.

According to the invention this object is achieved in that the combustion chamber above the first piston ring, recesses on the cylinder liner and, if necessary, on these recesses includes subsequent recesses on the cylinder head. It has proven to be particularly advantageous that the recess by a circumferential concave recess on the cylinder liner and a recess adjoining this recess in the area of the spark plug is formed in the cylinder head, or that the recess by a circumferential concave recess on the cylinder liner and a circumferential concave Recess is formed on the cylinder head.

409846 / Ό 541 '

Vorstoäiderdes Aufsidilsrols- Dr. lie H. cTerdinand Porsche Management Board: Dr. Ernst Fuhrmann, Heinz Branilzki Seat of the Cesel'sdiaif: StuMgait · Segistergencht: District Court Stuttgart, HRB-Nr. 5211 - Telefo., 07Π / 8203-Ι · Telex 07-2187) Porsdieauto Stuttgart ■ Postfach Ί0064Ο

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The advantages achieved by the invention are in particular that a Combustion chamber to be produced easily and cost-effectively was created in which there is sufficient combustion HC emissions in the area above the top piston ring is considerably reduced.

In the drawings showing two exemplary embodiments of the invention are

Figure 1 is a cross section through the upper part of the cylinder and the lower part of the cylinder head of a Internal combustion engine with circumferential concave recesses in the cylinder liner and in the Cylinder head,

Figure 2 is a cross section through the upper part of the cylinder and the lower part of the cylinder head of an internal combustion engine with a circumferential concave recess in the cylinder liner and one in the The area of the spark plug to this recess subsequent recess in the cylinder head.

In FIG. 1, 1 denotes a cylinder liner, 2 denotes a cylinder head, 5 denotes a piston and 4 denotes the top piston ring. In the area above the piston ring 4, the cylinder liner has a circumferential concave recess 5, which continues in a circumferential concave recess 6 in the cylinder head 2. As a result, the _{combustion chamber labeled s} 7 is enlarged in the area above the piston ring 4, which ensures that the fuel mixture burns through in this area, especially since the combustion process can be initiated in this zone before top dead center. As a result, the proportion of HC emissions that occurs just above the upper piston ring 4 between the piston 3 and the cylinder liner 1 is considerably reduced.

4 098A6 / 054T

232157?

29

In FIG. 2, 8 denotes a cylinder liner, 9 denotes a cylinder head, 10 denotes a piston and 11 denotes the top piston ring. The cylinder liner 8 has a circumferential concave recess 12 above the piston ring 11, which continues in a recess Ik of any shape in the area of a spark plug 15, whereby the combustion chamber 15 above the piston ring 11 and in the area of the spark plug 15 is enlarged. In this way, essentially the same advantages are achieved as already described for FIG.

The invention is not restricted to the recess shapes shown in FIGS. 1 and 4, but is any other form of recesses and recess combinations conceivable between cylinder liner and cylinder head, as far as This results in a significant improvement in HC emissions in the area above the top piston ring between the pistons and cylinder liner is guaranteed. A simultaneous Bevelling of the piston in the area above the top piston ring is also possible. In addition, you can Of course, these recesses can also be inserted directly into the internal combustion engine without an additional cylinder liner

Crankcase are introduced.

409846/0541

Claims (1)

-4 - R 29 Proprietary rights sayings ! ../ Internal combustion engine with a combustion chamber that is from a cylinder head surface and the end face of a piston, characterized in that the combustion chamber (7, 15) above the first piston ring (4, II) recesses (5, 12) on the cylinder liner (1, 8) and if necessary comprises recesses (6, 14) on the cylinder head (3, 9) adjoining these recesses (5, 12). 2 ο internal combustion engine according to claim 1, characterized in that that the recess is formed by a circumferential concave recess (12) on the cylinder liner (8) and a recess (14) in the cylinder head (9) adjoining this recess (12) in the area of the spark plug (13) becomes,.; «■ 3 «internal combustion engine according to claim 1, characterized in that the recess by a circumferential concave Recess (5) on the cylinder liner (1) and a circumferential concave recess (6) on the cylinder head (2) is formed. = 409846/0541