Cylinder of a combustion engine for a vehicle and corresponding manufacturing method, means for manufacturing the cylinder, spark plug, combustion engine and vehicle

Abstract

A cylinder of a combustion engine for a vehicle includes at least one intake duct and a spark plug which in turn includes a ground electrode. The spark plug is mounted in the cylinder such that during an operation of the combustion engine the ground electrode is cooled in as optimum a manner as possible by an airflow generated by the at least one intake duct. A spark plug and a method for manufacturing a cylinder of a combustion engine are also provided.

Claims

1. In a combustion engine for a vehicle, a cylinder configuration comprising: a cylinder including exactly two intake ducts and a spark plug; said cylinder being formed with a mounting hole having an internal thread for receiving said spark plug; said spark plug including a ground electrode, a spark plug collar, and an external thread; said ground electrode having an open end; said ground electrode being attached to said spark plug collar at a given circumferential location on said spark plug collar, said given circumferential location on said spark plug collar and said external thread being oriented in a predetermined spatial orientation with respect to one another, the predetermined spatial orientation ensuring that said open end of said ground electrode is directed, with a given tolerance, between said two intake ducts, when said spark plug is mounted in said internal thread of said cylinder; and said internal thread of said cylinder and said external thread of said spark plug being adapted to one another such that, when said spark plug is screwed with a given torque in said internal thread of said cylinder, said open end of said ground electrode is directed, with the given tolerance, between said two intake ducts in order to provide an increased cooling of said ground electrode, during an operation of the combustion engine, by an airflow generated by said two intake ducts.

2. The cylinder configuration according to claim 1, wherein the given tolerance is within a range of 90 to 5.

3. A manufacturing method for manufacturing a cylinder configuration of a combustion engine for a vehicle, comprising the steps of: providing a cylinder having exactly two intake ducts and a spark plug, the cylinder being formed with a mounting hole having an internal thread for receiving the spark plug, the spark plug including a ground electrode, a spark plug collar, and an external thread, the ground electrode having an open end; and mounting the spark plug in such a manner in the cylinder such that the ground electrode is attached to the spark plug collar at a given circumferential location on the spark plug collar, wherein the given circumferential location on the spark plug collar and the external thread are oriented in a predetermined spatial orientation with respect to one another, wherein the predetermined spatial orientation ensures that the open end of the ground electrode is directed, with a given tolerance, between the two intake ducts, when the spark plug is mounted in the internal thread of the cylinder, and wherein the internal thread of the cylinder and the external thread of the spark plug are adapted to one another such that, when the spark plug is screwed with a given torque in the internal thread of the cylinder, the open end of the ground electrode is directed, with the given tolerance, between the two intake ducts in order to provide an increased cooling of the ground electrode, during an operation of the combustion engine, by an airflow generated by the two intake ducts.

4. The manufacturing method according to claim 3, which comprises placing the spark plug in the cylinder by rotating the spark plug about a central longitudinal axis of the spark plug and rotating the spark plug so that the open end of the ground electrode points with the given tolerance between the two intake ducts.

5. The cylinder configuration according to claim 1, wherein said external thread of said spark plug has a surface with a profile, said profile of said surface of said external thread being a rolled profile.

6. The cylinder configuration according to claim 1, wherein said spark plug has a spark plug ceramic and a spark plug collar, and wherein said spark plug collar extends on a combustion chamber side thereof so that said spark plug collar terminates at least with said spark plug ceramic.

7. The cylinder configuration according to claim 1, wherein said spark plug has a spark plug ceramic and a spark plug collar, and wherein said spark plug collar extends on a combustion chamber side thereof so that said spark plug collar protrudes to some extent beyond said spark plug ceramic.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a diagrammatic plan view of a cylinder head as viewed from the interior space of the cylinder in accordance with the invention;

(2) FIG. 2 is a diagrammatic sectional view of the cylinder head along section line 6 in FIG. 1 in accordance with the invention;

(3) FIG. 3 is a diagrammatic sectional view of a spark plug according to the invention; and

(4) FIG. 4 is a schematic view of a vehicle according to the invention having a combustion engine in accordance with the invention.

DETAILED DESCRIPTION OF THE INVENTION

(5) Referring now to the figures of the drawings in detail and first, particularly, to FIG. 1 thereof, there is shown a cylinder head 100 as viewed from the interior space of the cylinder. Two intake ducts 4 and two outlet ducts 5 can be seen, wherein a spark plug 1 is mounted symmetrically in the middle of these intake ducts 4 and outlet ducts 5. The cylinder is formed with a mounting hole having an internal thread 100a for receiving the spark plug 1. The spark plug 1 has an external thread 1a.

(6) In FIG. 2, a sectional view is shown which depicts a section, represented by reference character 6 in FIG. 1, through the center of the cylinder head or, respectively, of the combustion chamber. Here, an intake duct 4 is shown on the left (in FIG. 2), an outlet duct 5 on the right, and the spark plug 1 in the middle. The ground electrode 2 of the spark plug 1 can be seen, wherein the ground electrode 2 is curved from the outer edge of the spark plug 1 toward the longitudinal central axis of the spark plug 1. The open end of the ground electrode 2, which is denoted by the reference character 3, is aligned exactly toward the left in the FIG. 2 (in other words exactly in the direction of the section 6). The open end 3 of the ground electrode 2 is therefore aligned exactly between the two intake ducts 4.

(7) A section through the spark plug 1 is shown in FIG. 3. The spark plug collar 12 ends flush with the spark plug ceramic 14 or even protrudes beyond the spark plug ceramic 14. The spark plug ceramic 14 is shielded in the spark plug housing 11 and forms the insulator.

(8) A vehicle 10 in accordance with the invention which has a combustion engine 8 according to the invention is shown in FIG. 4. This combustion engine 8 in turn includes four cylinders 7 according to the invention.