Internal-combustion engines – Igniters – Sparkers
Patent
1991-05-15
1992-03-17
Nelli, Raymond A.
Internal-combustion engines
Igniters
Sparkers
200 19R, 200 19DR, 200 19DC, F02P 100
Patent
active
050958631
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to improvements in ignition distributor for internal combustion engines. The shielding of the ignition distributor is provided only when there is a perfectly conducting connection of the shielding cap to the grounded vehicle chassis. There is already known from German Utility Model No. 8,515,918.2 an ignition distributor in which there is inserted at each screwing in point at which the shielding cap is connected to the distributor cap and the latter is connected to the housing of the ignition distributor and thus to the vehicle chassis, a disc whose outer region is injected into the shielding cap and whose interior has internal teeth produced by stamping and projecting conically from the plane of the distributor ring. The grounding of the shielding cap to the housing of the ignition distributor takes place when, upon mounting the distributor cap, the screw head in each case brings the inner part of the disc to bear on one flat end face of the bush, and clamps it there. The known ignition distributor thus comprises in two parts, and it would be necessary to plan an additional operation during the final assembly, it being necessary to pay heed to exact seating of the shielding cap on the distributor cap, to the correct assignment of the discs to the bushes, and to clean surfaces, in order for a perfect grounding to take place.
OBJECTS AND SUMMARY OF THE INVENTION
It is a principal object of the ignition distributor according to the invention to provide the advantage that the distributor ring consists of a simpler disc in the form of a diaphragm spring, which is constructed as a flat disc in its internal region, and thus no longer has segments. The grounding between the shielding cap and bush, and thus to the ignition distributor housing is achieved by partial plastic deformation of the correspondingly configured bush with the interior of the diaphragm spring. In this way, an exactly fixed connection with very good grounding is achieved, especially if the plastic deformation is done in a point-like fashion and a high contact reliability is achieved via the high surface pressure thus attained.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention is represented in the drawing with reference to two figures, and explained in more detail in the following description.
FIG. 1 shows a longitudinal section through a part of an ignition distributor, and
FIG. 2 shows the points of connection between the bush and distributor ring in the direction of arrow Y in FIG. 1.
DETAILED DESCRIPTION
Represented in the drawing in FIG. 1 is a partial section through an ignition distributor 10, on the housing 12 of which a distributor cap 16 is fixed with a plurality of head screws 14. In the region of each screw passage, the distributor cap 16, which is made of plastic, has a cylindrical bush 18, which is connected as an insert in a form-locking fashion to the distributor cap, which is produced by plastic injection. On its one end face, which faces the head of the assigned head screw, the bush 18 bears in a radial extension a collar 22, provided with a shoulder 20, on which the internal section of a diaphragm spring constructed as a disc 24 bears and is covered by a step 25 in the collar 22. The external section of the disc 24 is connected as an insert in a form-locking fashion to a shielding cap 26, produced by plastic injection, which covers the distributor cap 16. In its outer region, the disc 24 has six projections 28, which are produced by stamping holes therethrough; the projections have axes extending approximately perpendicular to the base surface of the disc 24. The disc 24 is fixed securely in the shielding cap 26 with these projections 28. Underneath the collar 22, in the region of the cylinder shaft, the bush 18 has a second collar, via which, in turn, a form-locking connection is produced with the distributor cap 16.
FIG. 2 shows the bush 18 in the region of its collar 22 after the connection according to the invention of the disc 24. In this process, the collar 22 i
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Greigg Edwin E.
Greigg Ronald E.
Nelli Raymond A.
Robert & Bosch GmbH
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