Internal-combustion engines – High tension ignition system – Having a specific ignition coil
Patent
1984-04-05
1985-10-15
Argenbright, Tony M.
Internal-combustion engines
High tension ignition system
Having a specific ignition coil
336110, 336234, F02P 302, H01F 2730
Patent
active
045467536
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS(s)
This U.S. application stems from PCT International Application No. PCT/FR83/00131 filed July 1, 1983.
The present invention relates to an ignition coil, for internal combustion engines, the ignition coil having a closed magnetic circuit constituted by metal sheets which are stamped and stacked one on the other; a permanent magnet disposed in an arm of thickness E of said circuit; primary and secondary windings housed in an insulating housing surrounding another arm of thickness E'.
This ignition coil includes a magnetic flux shunt circuit such that the flux inversion created in the arm of thickness E', by the current flowing in the primary winding, does not demagnetise the permanent magnet.
This magnetic flux shunt circuit is constituted by two metal plates of mild steel, which sheets have tabs each provided with a hole, or an opening, which receives a screw for fixing the ignition coil on the motor vehicle.
Such ignition coils, known particularly from French Patent Application Nos: FR-A-2.476.218 and 2.486.160, have the disadvantage that in order to render the arms of thickness E and E' rigid by means of rivets, it is necessary that the ends of the arm E' should be overlapped which requires the provision of one stamping tool for the metal sheets constituting the arm of thickness E' and three stamping tools for the group of sheets constituting the arm E.
Another disadvantage is that the magnetic circuit can only be made rigid after the insulating housing containing the primary and secondary windings has been located on the arm of thickness E' and, in a second stage a certain number of metal sheets have been stacked on the arm of thickness E, so as to constitute a stack of a thickness corresponding to the thickness E'.
After this, in a third stage, the circuit must be completed by the metal sheets of the arm of thickness E which ensure the overlapping of the ends of the arm of thickness E'.
These successive operations represent a portion of the cost price of these coils which is not negligible.
The object of the present invention is to remedy these disadvantages and to this end it relates to a coil having a closed magnetic circuit constituted by stamped metal sheets which are stacked one on the other, the ignition coil having a permanent magnet disposed in one of the arms of the closed magnetic circuit; primary and secondary windings housed in an insulating housing surrounding another arm, and a magnetic flux shunt circuit, characterized in that the closed magnetic circuit includes a first part of thickness E' and having a U-shape, of which one of the portions is stamped with a chamfered edge, and a second part of thickness E greater than the thickness E', which second part, being L-shaped, has a portion which is stamped with a chamfered edge in such a way that after the insulating housing containing the primary and secondary windings has been located on the arm of thickness E', and the first and second parts have been inserted between the chamfered portions, the said parts are made rigid by means of the metal plates constituting the magnetic flux shunt circuit.
A first advantage produced by this invention is that the stamping of the metal sheets of the magnetic circuit requires only one tool per part, which reduces the outlay for stamping tools.
A second advantage is the reduction in the assembly time, by reason of the fact that the metal sheets, which in the prior art ensured that the magnetic circuit was rigid by overlapping the ends of the arm E', are removed, the magnetic circuit being made rigid by an extension of the metal plates constituting the magnetic flux shunt circuit.
The description which follows, with reference to the accompanying drawings, will facilitate a better understanding of how the invention may be carried out.
FIG. 1 is a longitudinal view of an ignition coil in accordance with the invention.
FIG. 2 is a side view along the arrow A, of the ignition coil of FIG. 1.
FIG. 3 is a side view, along the arrow B, of the ignition coil of FIG. 1.
FI
REFERENCES:
patent: 1545429 (1925-07-01), Hunt
patent: 1623426 (1927-04-01), Mallory
patent: 1953174 (1935-04-01), Hartzell
patent: 4099510 (1978-07-01), Perrier et al.
Argenbright Tony M.
Ducellier & Cie
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