Inductor devices – With outer casing or housing
Reexamination Certificate
2001-07-02
2002-12-31
Mai, Anh (Department: 2832)
Inductor devices
With outer casing or housing
C336S092000, C336S096000
Reexamination Certificate
active
06501360
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ignition coil for motor vehicles, comprising a single output terminal, designed to be mounted directly on the end portion of a corresponding spark plug. Coils of this type comprise a body carrying at one end a flexible cap provided with a seat designed to receive the end of a spark plug. The cap comprises a high-voltage terminal electrically connected to the high-voltage winding of the coil and provided with a connection portion designed to receive a terminal of the plug.
Spark plugs of the type specified above, provided with a diode connected in series between the high-voltage winding and the high-voltage terminal of the coil are known. The use of a high-voltage diode in a single-output coil has the peculiar function of eliminating the overvoltages generated by the oscillations of the primary current at the start of the charging cycle. These overvoltages may cause undesired pre-ignition. In coils of the known type, the high-voltage diode is set inside the coil body.
The aim of the present invention is to provide an ignition coil of the type described above that is simpler from the constructional standpoint, more reliable, and of smaller dimensions than known coils.
SUMMARY OF THE INVENTION
According to the present invention the above purpose is achieved by an ignition coil having the characteristics that form the subject of the main claim.
REFERENCES:
patent: 3563334 (1971-02-01), McCarter
patent: 4388549 (1983-06-01), Bensman
patent: 5349320 (1994-09-01), Suzuki et al.
patent: 5370100 (1994-12-01), Benedikt et al.
patent: 5411006 (1995-05-01), Noble et al.
patent: 5419300 (1995-05-01), Maruyama et al.
patent: 2 252 454 (1992-08-01), None
patent: 05 172028 (1993-07-01), None
Bernardi Giorgio
Martagni Enrico
Poletti Gabriele
Federal-Mogul Ignition Srl
Mai Anh
Reising Ethington, Barnes, Kisselle, Learman & McCulloch, P.C.
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