Inductor devices – Relatively movable coils – With core
Reexamination Certificate
1998-02-18
2001-04-17
Mai, Anh (Department: 2832)
Inductor devices
Relatively movable coils
With core
C336S117000, C336S119000
Reexamination Certificate
active
06218924
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to an arrangement for contactless transmission of a deployment signal from a control circuit arranged on a motor vehicle chassis to an air bag installed in a steering wheel. whose primary and secondary windings are in separate pot-type cores which can rotate in opposite directions about the axis of rotation of the steering wheel.
BACKGROUND INFORMATION
German Patent Application No. 24 33 555 describes a conventional transformer arrangement.
An important criterion for the reliable operation of an air bag is that switching operations or short-circuits in a primary circuit of the transformer must not erroneously deploy the air bag. The transformer absorbs a relatively high magnetic energy in sudden startup and shutdown operations; this energy is discharged mainly in a load connected in a secondary circuit. With an air bag, this load is the firing pellet (squib) resistor. If the energy fed into the squib resistor exceeds a predetermined threshold, the air bag is deployed.
Therefore, the object of the present invention is to provide an arrangement of the type defined in the preamble that will avoid unintentional deployment of the air bag when sudden startup or shutdown operations occur in the primary circuit of the transformer or short-circuits occur between the squib and the power supply lines of the vehicle battery.
SUMMARY OF THE INVENTION
According to the present invention, one of two pot cores of the transformer is not designed as a solid ring but is instead made of one or more ring segments. Accordingly, an inductance of the transformer is reduced so that the magnetic energy absorbed, e.g., when there is a short-circuit to power supply lines in the primary circuit, is not sufficient to deploy the air bag. The magnetic energy absorbed by the transformer can be further reduced by limiting the current in the primary circuit by a higher-resistance design of the primary winding. The segmentation of the pot core also permits a reduction in weight, which has especially advantageous effects with respect to the steering wheel.
REFERENCES:
patent: 2838737 (1958-06-01), Duncan
patent: 3317873 (1967-05-01), Himmelstein et al.
patent: 4038624 (1977-07-01), Namba et al.
patent: 4167719 (1979-09-01), Forge
patent: 5498911 (1996-03-01), Bossler et al.
patent: 5945744 (1999-08-01), Dobler et al.
patent: 2509773A1 (1976-04-01), None
patent: 1239290 (1971-07-01), None
patent: 55-50610 (1980-09-01), None
patent: 235187 (1964-07-01), None
Dukart Anton
Zabler Erich
Kenyon & Kenyon
Mai Anh
Robert & Bosch GmbH
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