Electricity: circuit makers and breakers – Periodic – Contact breaker detail
Patent
1990-01-10
1991-10-15
Scott, J. R.
Electricity: circuit makers and breakers
Periodic
Contact breaker detail
200 19DR, H01H 1900, F02P 702, H01R 3960
Patent
active
050576534
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a high-voltage distributor for ignition systems of internal combustion engines.
A high-voltage distributor is known comprising a distributor cap of insulating material with a center electrode and several fixed electrodes and a distributor rotor with a rotor electrode which rotates synchronously with a cam shaft of the associated internal combustion engine and establishes an electrical connection one-after-the-other between the center electrode and each of the fixed electrodes. The center electrode which is coaxial with respect to the axis of rotation of the distributor rotor has an axially displaceable pin resting in a cylindrical guide in the distributor cap which rests on a rotor electrode in the distributor rotor under the action of a precompressed compression spring to establish an electric contact with the distributor rotor.
For reasons of space available during the assembly of such high-voltage distributors, the distributor cap must be pushed laterally, that is to say radially with respect to the center electrode, onto the distributor housing containing the distributor rotor or onto the cylinder head so that it can then be connected to the distributor housing or the cylinder head in the centered end position, in which the pin, which in most cases consists of carbon or carbon-containing material and will subsequently be called carbon, is then placed onto the rotor electrode and is partially inserted into the distributor cap against the action of the compression spring. The carbon, which protrudes far out of the distributor cap in the unloaded state due to the compression-spring loading, can be radially loaded by rotor parts or engine parts or the distributor housing coming into contact with the carbon during the lateral insertion of the distributor cap, even a slight bending stress leading to fracture of the carbon.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a high-voltage distributor of the above-described kind in which fracture of the carbon during assembly is avoided.
According to our invention the cylindrical guide is widened in the vicinity of the pin emergence opening in the distributor opening to form a funnel-shaped widening.
By comparison, the high-voltage distributor according to the invention, having the characterizing features of claim 1, has the advantage that due to the funnel-shaped widening of the cylindrical carbon guide near the opening where the carbon emerges from the carbon guide, a flexible flexurally elastic mounting of the carbon in the distributor cap is achieved during the assembly. The carbon, which is pushed out into the widening with its compression-spring-side end in the unloaded state can be laterally deflected during the lateral insertion of the distributor cap and, as a result, is not exposed to any bending stress After assembly, the carbon, which has been pushed back again deeply into the carbon guide, is mainly carried in the cylindrical part of the guide.
If, in accordance with an advantageous embodiment of the invention, the rotor electrode is surrounded by a guide edge in the support area of the carbon, an additional guidance of the carbon is achieved and a protection against any lateral drifting away of the carbon in the operating condition is created. In this case, the cylindrical guide can have a loose fit for the carbon. The lateral guide edge in this arrangement can be integrally provided at a contact plate mounted on the rotor electrode or molded onto the distributor rotor.
DETAILED DESCRIPTION OF THE DRAWING
In the description following, the invention is explained in greater detail with reference to illustrative embodiments shown in the drawing, in which:
FIG. 1 is a longitudinal cross sectional view of a high-voltage distributor according to our invention, and
FIG. 2 is a detailed longitudinal cross sectional view of another embodiment of a high-voltage distributor according to our invention.
DETAILED DESCRIPTION OF THE INVENTION
The high-voltage distributor, s
REFERENCES:
patent: 1370077 (1921-03-01), Whisler
patent: 2174081 (1939-09-01), Fitzsimmons
patent: 3951508 (1976-04-01), Farrer et al.
patent: 4023546 (1977-05-01), Kawakami
patent: 4384178 (1983-05-01), Nagai et al.
patent: 4562317 (1985-12-01), Gerber et al.
patent: 4575593 (1986-03-01), Welker et al.
patent: 4632077 (1986-12-01), Novak et al.
Haug Heinz
Perner Matthias
Robert & Bosch GmbH
Scott J. R.
Striker Michael J.
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