Internal-combustion engines – High tension ignition system – Specific coil location
Patent
1998-04-06
1999-04-06
Kwon, John T
Internal-combustion engines
High tension ignition system
Specific coil location
123143C, F02P 1100
Patent
active
058904735
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an ignition device for a multi-cylinder internal combustion engine.
BACKGROUND INFORMATION
An ignition device, in which a plurality of individual ignition coils are individually mounted in a supporting unit and protrude from the supporting unit with their high-voltage domes, is described in European Patent No. 0 512 357.
A support unit assembled in this manner can be installed as a single piece on the cylinder head of an internal combustion engine, whereby all spark plugs become connected with the respective ignition coils.
However, the ignition coils are disadvantageously rigidly fastened in the supporting unit, so that they are exposed to strong vibration accelerations during operation of the internal combustion engine, which may impair the operating reliability of the ignition device.
SUMMARY OF THE INVENTION
The ignition device according to the present invention has the advantage over the background art in that the aforementioned disadvantage is eliminated to a satisfactory degree. For this purpose, an end section of each ignition coil of the ignition device is formed by a part of the ignition coil core protruding from the ignition coil housing, on which a damper is mounted. Since the other end section of each ignition coil is connected to at least one elastic body, the ignition device can be elastically fastened on a cylinder head of the internal combustion engine using a fastening element.
Vibration acceleration during the operation of the internal combustion engine is thus dampened and the operating reliability of the ignition device is maintained even under such loads.
BRIEF DESCRIPTION OF THE DRAWING
The FIGURE shows a partially sectioned side view of an ignition device according to an embodiment of the present invention.
DETAILED DESCRIPTION OF THE INVENTION
An ignition device 11 illustrated in the figure for a multi-cylinder internal combustion engine comprises, depending on the number of cylinders of the internal combustion engine, a plurality of ignition coils 12. Ignition device 11 is designed for mounting on a cylinder head 13 of the internal combustion engine. "Spark plug pits" 15 with round average cross sections are arranged in cylinder head 13, each one assigned to one cylinder and each with an inlet opening 14. A spark plug 16 is fastened in a fixed position, recessed in each spark plug pit 15 in a known manner. Spark plug 16 has a high-voltage terminal 17 inside, facing inlet opening 14; said high-voltage terminal comprises a pin-shaped electrode 18 and a basically cylindrical insulating body 19 supporting electrode 18.
Ignition coils 12 are designed as rod coils with a cylindrical housing 20 made of elastic insulating material. The diameter of housing 20 is smaller than the diameter of spark plug pit 15 to allow some play. A first end section 21 for arranging the respective spark plug 16 on high-voltage terminal 17 and a second end section 22 as an extension of a core 23, otherwise running inside housing 20 of ignition coil 12, protrude from the housing.
Core 23 is rod-shaped, it is made of a layered, magnetically conductive material, and supports, in a known manner, a concentric arrangement of a primary and a secondary coil, not illustrated here.
Core 23 has a spray coating 24 of plastic material, which envelops core 23 over large areas, but at the beginning of second end section 22, at the outlet from housing 20, it is shaped as an axially oriented shell-shaped high-voltage dome 27, in addition to a radially extending peripheral shoulder 26, as a first end section 21 in the form of an extension of core 23. Recessed from the free end of high-voltage dome 27, an axially oriented pin-shaped high-voltage connecting element 28 is arranged in said high-voltage dome.
A damper 29 in the form of a hat-shaped rubber cap is mounted on the second end section 22, with bottom 31 in contact with the face of second end section 22, and with an external surface 32 laterally in contact with the second end section 22 up to shoulder 26
REFERENCES:
patent: 4706639 (1987-11-01), Boyer et al.
patent: 5109828 (1992-05-01), Tagami et al.
patent: 5111790 (1992-05-01), Grandy
patent: 5152274 (1992-10-01), Maekawa
patent: 5239973 (1993-08-01), Murata et al.
patent: 5501205 (1996-03-01), Betz et al.
patent: 5577921 (1996-11-01), Philyaw et al.
Betz Dieter
Hammer Uwe
Nuebel Karl-Heinz
Kwon John T
Robert & Bosch GmbH
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