Internal-combustion engines – Igniters – Sparkers
Patent
1982-08-27
1984-03-06
Nelli, Raymond A.
Internal-combustion engines
Igniters
Sparkers
1231465R, F02P 700, H02K 1100
Patent
active
044347545
DESCRIPTION:
BRIEF SUMMARY
This application relates to commonly assigned copending application Ser. No. 432,892, Filed Aug. 27, 1982, entitled "Distributor Construction and Signal Generator", invented by F. B. Casaceli; D. H. Fox and C. C. Kostan.
TECHNICAL FIELD
This invention relates to a method for orienting a magnetic element for producing an electrical signal in synchronism with the periodic movement of a piston in an internal combustion engine.
BACKGROUND ART
In machines having a cyclic operation, as in an internal combustion engine, certain operations or certain movements must be controlled or actuated in synchronism with the displacement or rotation of a part such as the crankshaft. For example, the occurrence of spark ignition, fuel injection, and movement of a valve, must be coordinated. One of the known difficulties is to mount a position sensor so that it has a fixed, known position with respect to a reference position of the moving engine. When an engine position is established so that the number one cylinder has a piston at top dead center, the distributor can be mounted on the engine so that the position sensor indicates the engine's position. However, such mounting is typically subject to a mechanical mounting error.
For example, U.S. Pat. No. 3,517,142 to Hans-Dieter Bastam et al teaches a typical mechanical connection where a signal generator assembly is mounted on a distributor shaft and cooperates with two pivotable contacts. U.S. Pat. No. 4,235,213 to Jellissen teaches an ignition system housing to provide timing signals fo an automotive ignition distributor system. A housing is mounted on a swing arm. The housing is fixed in position and locked in place by screws engaged in the threaded central bores of the housing. The housing is attached to the swing arm by having bosses positioned within the cavities.
In the systems taught in both these patents, the errors inherent in such mechanical mountings of the signal generating circuit reduce the correlation between the actual position of the engine and the indicated position to the engine. These are some of the problems this invention overcomes.
DISCLOSURE OF INVENTION
In accordance with an embodiment of this invention, a method of assembling a distributor includes integrally mounting a distributor rotor and shaft assembly directly to a camshaft, then positioning an uncharged magnet on the distributor shaft assembly and charging the magnet in place thereby insuring accurate engine initial timing. The charging occurs after a known engine position is established. Such in place charging of the magnet eliminates manufacturing tolerances that contribute to inaccuracies between the indicated and actual crankshaft positions.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a cross-section of a distributor mounted on an engine camshaft in accordance with an embodiment of this invention;
FIG. 2 is an end view of an intermediate shaft which is coupled to the engine camshaft;
FIG. 3 is an end view of a magnet to be mounted on the intermediate shaft in accordance with an embodiment of this invention;
FIG. 4 is an elevation view of a magnetic charging tool for a distributor in accordance with an embodiment of this invention;
FIG. 5 is a section view taken generally along section line 5--5 of FIG. 4 and includes a portion of the distributor of FIG. 1 to show how the magnetic charging tool mates with the distributor;
FIG. 6 is a top view of the rotor of a distributor in accordance with an embodiment of this invention; and
FIG. 7 is a side view of an engine and a distributor mounted thereon in accordance with an embodiment of this invention.
BEST MODE FOR CARRYING OUT THE INVENTION
Referring to FIGS. 1 and 7, distributor 10 is directly mounted on a camshaft 20 of an engine 22. An intermediate shaft 12 is mounted and oriented directly on camshaft 20 eliminating the need for any bearings. A ring-like magnet 14 is positioned on intermediate shaft 12 to provide an indication of the rotational position of intermediate shaft 12, of camshaft 20 and therefore of the engine cranksh
REFERENCES:
patent: 3783314 (1984-01-01), Kostan
patent: 4166966 (1979-09-01), Wittlinger et al.
patent: 4307698 (1981-12-01), Toshinari
patent: 4370965 (1983-02-01), Grossner et al.
Casaceli Frank B.
Fox David H.
Kostan Charles C.
Abolins Peter
Ford Motor Company
Nelli Raymond A.
Sanborn Robert D.
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