Electricity: circuit makers and breakers – Periodic – Contact breaker detail
Patent
1990-01-10
1991-10-01
Scott, J. R.
Electricity: circuit makers and breakers
Periodic
Contact breaker detail
200 19DC, 200 19DR, H01H 1900, F02P 702
Patent
active
050535870
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a high-voltage distributor for an ignition system of an internal combustion engine.
A high-voltage distributor for an ignition system is known comprising a distributor cap of insulating material, which has a center electrode and several fixed electrodes and a distributor rotor which rotates synchronously with the camshaft of the internal combustion engine establishing in each case an electrical connection between the center electrode and one of the fixed electrodes via a rotor electrode.
In the known high-voltage distributors of this type, the center electrode for establishing the electrical contact with the distributor rotor is provided with a carbon electrode or carbon contacting body. The contacting body or carbon electrode is axially displaceably held in a guide sleeve in the distributor cap and rests with a convex portion on its front face on the rotor electrode in the distributor rotor under the action of a compression spring. The compression spring is supported at the bottom of the guide sleeve on a contact plate, which is electrically connected to a distributor connection and, at the same time, is used for supplying high voltage to the carbon electrode or contacting body.
This type of construction of the center electrode requires very low tolerances in the linear alignment of the axis of rotation of the distributor rotor and the longitudinal axis of the carbon contacting body, which passes through the highest point of the convex portion of the contacting body. The point of contact between the carbon contacting body and the rotating rotor electrode, which is desirable for reasons of low wear, is worn away in operation with even slight eccentricity between the axis of rotation and the longitudinal axis and the carbon contacting body travels over the rotor electrode along a circular track as a result of which a much higher wear is produced in the carbon electrode or carbon contacting body.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a high-voltage distributor for an ignition system of an internal combustion engine of the above-described type, in which a low-wear point contact between the center electrode and the rotor electrode is maintained in operation even with an eccentricity between the axis of rotation of the distributor rotor and the longitudinal axis of the pin-shaped sliding contacting body (for example, a carbon electrode).
According to the present invention the distributor rotor has a dome, which is integral therewith, coaxial with the distributor rotor and protrudes towards the distributor cap. The dome has a centrally located cylindrical guide connected with the rotor electrode. In the cylindrical guide there is an axially displaceable pin-shaped sliding contacting body which contacts with its front face against the center electrode under the action of a compression spring which is supported directly or indirectly on the rotor electrode.
By comparison, the high-voltage distributor according to the invention, has the advantage that the low-wear point contact between center electrode and rotor electrode is maintained even with an eccentricity between the axis of rotation of the distributor rotor and the longitudinal axis of the pin-shaped sliding contacting body, for example a carbon electrode. The prerequisite for this is a wobble-free rotation of the distributor rotor, which is generally always a feature of the above type of distributors.
According to another feature of the invention the distributor rotor has an annular wall surrounding the dome and spaced a distance therefrom. This annular wall protrudes beyond the free end of the dome and is integral with the distributor rotor.
The pin-shaped sliding contacting body can slide with a close fit in the guide and has convex portion with a tip on its front face to provide contact with the center electrode. The tip of the convex portion is preferably located approximately on the axis of rotation of the distributor rotor.
The compression spring may be sup
REFERENCES:
patent: 1370077 (1921-01-01), Whisler
patent: 1665265 (1928-04-01), Hosterman
patent: 1890305 (1932-12-01), Schwarzman
patent: 2418504 (1947-04-01), Frei
patent: 4023546 (1977-05-01), Kawakami
patent: 4562317 (1985-12-01), Gerber et al.
patent: 4575593 (1986-03-01), Welker et al.
patent: 4632077 (1986-12-01), Novak et al.
Robert & Bosch GmbH
Scott J. R.
Striker Michael J.
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