Internal-combustion engines – Igniters – Sparkers
Patent
1983-06-23
1985-09-03
Cox, Ronald B.
Internal-combustion engines
Igniters
Sparkers
123420, 200 19DR, F02P 100
Patent
active
045385645
DESCRIPTION:
BRIEF SUMMARY
STATE OF THE ART
In known ignition devices, the adjustment of ignition timing is attained via centrifugal and vacuum devices of the ignition distributor. At the same time, the distributor rotor is adjusted by the centrifugal adjuster; that is, over the entire engine speed range the rotor has the same position relative to the cap electrode. The diameter of the high-voltage distributor can therefore be relatively small. Furthermore, the rotor electrode and the cap electrodes of the high-voltage distributor must be dimensioned such that a sparkover of the ignition spark occurs reliably at all the prespecified ignition adjustment angles, yet at the same time a sparkover to an incorrect electrode (an incorrect cylinder) is precluded.
In fully electronic ignition timing adjustment, this is accomplished electronically, and the ignition triggering means must therefore be separate from the centrifugal adjuster. As a result of this necessary separation of the centrifugal adjuster from the triggering means, however, it is attained that the follow-up is no longer effective; this necessitates an increase in the diameter of the high-voltage distributor. A high-voltage distributor of larger diameter causes problems, however, because the necessary access to the individual assemblies in the engine area is already problematical, given the usually cramped conditions there.
ADVANTAGES OF THE INVENTION
The problem discussed in the above section is solved with the ignition device for internal combustion engines according to the invention. The concept on which the invention is based is the coordinated adjustment of the distributor rotor in accordance with the electronically generated ignition timing.
Advantageous further developments of the invention are described in the dependent claims. With the further features of the ignition device of a plate secured to a coupler sheath, and an adjustable connection between rotor and plate an adjustment of the distributor rotor is possible. If the device a ring with members which engage the housing and the outer rotor electrode and in particular with claim 6, then as a result all the tolerances of the cooperating parts, except for the adjusting tolerance, can be ignored. As a result, greater high-voltage strength is attained in the high-voltage distributor.
DRAWING
One exemplary embodiment of the invention is shown in the drawing and explained in detail in the description below. Shown in actual size are:
FIG. 1, is a cutaway view, a vertical section taken through an ignition distributor;
FIG. 2, a top plan view on an adjusting ring and a distributor rotor; and
FIG. 3, in an enlarged detail view, a radial section taken along the line III--III of FIG. 2.
DESCRIPTION OF THE EXEMPLARY EMBODIMENT
As part of an ignition device for internal combustion engines having an electronic system for adjusting the instant of ignition, FIG. 1 shows an ignition distributor 10 having a cup-shaped housing 11 secured on the engine block (not shown) and a cap 12 of insulating material. Supported in the housing 11 are a drive shaft 13 and an inductive transducer 14, which generates pulses and supplies them for processing to a network device (not shown). Molded in the cap 12 are fixed electrodes 15, corresponding in number to the number of engine cylinders, and a middle electrode 16.
A distributor rotor 17 supplies the high voltage of the middle electrode 16 via a rotor electrode 18 to the individual fixed electrodes 15 and to the spark plugs, not shown, connected therewith.
A centrifugal adjuster 19 is connected to the drive shaft 13 and coupled via a pair of springs 21 with a coupler sheath 20 supported on the end segment 22 of the drive shaft 13. A plate 23 having three internal threads 24 (only one of which is shown) is connected in an undetachable manner with the coupler sheath 20 by caulking.
The distributor rotor 17 has a plurality of protrusions 25 supported on the plate 23 and a plurality of flange segments 26, each having a molded sleeve 27. Each sleeve has an oblong slot 28, through which the t
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patent: 2305018 (1942-12-01), MacGillivray
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patent: 3577963 (1971-05-01), Bechmann
patent: 3600530 (1971-08-01), Dusenberry
patent: 3906917 (1975-09-01), Lorti
patent: 4315493 (1982-02-01), Onishi et al.
Ehrmann Karl
Gerber Richard
Cox Ronald B.
Robert & Bosch GmbH
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