US3675636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition device for internal combustion engines
Assignee: Siemens AG
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Filing: 1969-12-09
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Granted: 1972-07-11
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Expires: 1989-12-09
Abstract
Abstract Ignition device for an internal combustion engine having a spark gap ignitable by the secondary voltage of a transformer in accordance with mechanically controlled, brief variations in the primary voltage of the transformer includes a magnetic fielddependent resistance connectible to the primary coil of the transformer, permanent magnet means displaceable relative to the resistance, and yoke means comprising a circuit for magnetic flux from the permanent magnet means, the circuit being continuously maintainable irrespective of the displaced position of the permanent magnet means, the resistance being intermittently connectible in the circuit in the course of displacement of the permanent magnet means.
Inventors
- 👤 Paul Hini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:37
CPC Classifications
F; F02; F02P; F02P7/00; F02P7/06; F02P7/061
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
150 words
Ignition device for an internal combustion engine having a spark gap ignitable by the secondary voltage of a transformer in accordance with mechanically controlled, brief variations in the primary voltage of the transformer comprising a magnetic fielddependent resistance connectable to the primary coil of the transformer, permanent magnet means displaceable relative to said magnetic field-dependent resistance, said permanent magnet means having a pair of magnet poles and a plurality of pole shoes for one of said poles, and yoke means connected to the other of said magnet poles and comprising a circuit for magnetic flux from said permanent magnet means, said circuit being continuously maintainable for conducting a substantially constant magnetic flux in the same flow direction therethrough irrespective of the displaced position of said permanent magnet means, said magnetic field-dependent resistance being intermittently connectable in said magnetic flux circuit in the course of displacement of said permanent magnet means.
Claim 2
Dependent Claim
150 words
Ignition device for an internal combustion engine having a spark gap ignitable by the secondary voltage of a transformer in accordance with mechanically controlled, brief variations in the primary voltage of the transformer comprising a magnetic fielddependent resistance connectable to the primary coil of the transformer, permanent magnet means displaceable relative to said magnetic field-dependent resistance, said permanent magnet means having a pair of magnet poles and a plurality of pole shoes for one of said poles, and yoke means connected to the other of said magnet poles and comprising a circuit for magnetic flux from said permanent magnet means, said circuit being continuously maintainable for conducting a substantially constant magnetic flux in the same flow direction therethrough irrespective of the displaced position of said permanent magnet means, said magnetic field-dependent resistance being intermittently connectable in said magnetic flux circuit in the course of displacement of said permanent magnet means.
Claim 3
Dependent Claim
93 words
Ignition device according to claim 1 wherein said permanent magnet means comprises a permanent magnet and a disc engageable with a face of said permanent magnet, said permanent magnet being formed with a central bore within which a shaft rotatable by the internal combustion engine is mounted, said permanent magnet having magnetization extending in direction parallel to the axis of said rotary shaft, said disc being fastened to said rotary shaft so as to be rotatable therewith, said pole shoes being located equidistantly spaced from one another along the periphery of said disc.
Claim 4
Dependent Claim
145 words
Ignition device according to claim 2 wherein said yoke means is located in part at a side of said permanent magnet opposite said face thereof with which said disc is engageable and comprises three cross-pieces extending parallel to the axis of said rotary shaft and located along the periphery of said disc, said cross-pieces having end faces disposed so as to be nearly flush with said pole shoes of said rotary disc, said cross-pieces having predetermined mutual spacing and respective lengths along said periphery of said rotary disc for forming, in the course of rotation of said disc, continuous magnetic flux circuit means alternately through two pole shoes of said disc and both outer cross-pieces, on the one hand, and between one pole shoe of said disc and the middle cross-piece, on the other hand, said magnetic-field dependent resistance being connected in said middle cross-piece.
Claim 5
Dependent Claim
14 words
Ignition device according to claim 3 wherein said middle cross-piece is removable and replaceable.
Claim 6
Dependent Claim
76 words
Ignition device according to claim 2 wherein said yoke means is located in part adjacent a face of said permanent magnet opposite said face thereof with which said disc is engageable and comprises an annular ring disposed coaxially to said rotary shaft and having an end face nearly flush with said pole shoes of said rotary disc, said magnetic field-dependent resistance being disposed in an air space located between said annular ring and said disc teeth.
Claim 7
Dependent Claim
18 words
Ignition device according to claim 1 wherein said magnetic field-dependent resistance is formed of semiconductive crystalline indium antimonide.
Claim 8
Dependent Claim
23 words
Ignition device according to claim 6 wherein said semiconductive crystalline indium antimonide has inclusions of a second crystalline phase possessing relatively good conductivity.
Claim 9
Dependent Claim
28 words
Ignition device according to claim 2 including means for determining the rotary speed of said rotary shaft in accordance with an electrical signal from said magnetic field-dependent resistance.
Claim 10
Dependent Claim
126 words
Ignition device for an internal combustion engine having a spark gap ignitable by the secondary voltage of a transformer in accordance with mechanically controlled, brief variations in the primary voltage of the transformer comprising a magnetic field-dependent resistance formed of semiconductive crystalline indium antimonide having inclusions of a second crystalline phase formed of nickel antimonide and being connectible to the primary coil of the transformer, permanent magnet means displaceable relative to said magnetic field-dependent resistance, and yoke means comprising a circuit for magnetic flux from said permanent magnet means, said circuit being continuously maintainable irrespective of the displaced position of said permanent magnet means, said magnetic field-dependent resistance being intermittently connectible in said magnetic flux circuit in the course of displacement of said permanent magnet means.
Claim 11
Dependent Claim
126 words
Ignition device for an internal combustion engine having a spark gap ignitable by the secondary voltage of a transformer in accordance with mechanically controlled, brief variations in the primary voltage of the transformer comprising a magnetic field-dependent resistance formed of semiconductive crystalline indium antimonide having inclusions of a second crystalline phase formed of nickel antimonide and being connectible to the primary coil of the transformer, permanent magnet means displaceable relative to said magnetic field-dependent resistance, and yoke means comprising a circuit for magnetic flux from said permanent magnet means, said circuit being continuously maintainable irrespective of the displaced position of said permanent magnet means, said magnetic field-dependent resistance being intermittently connectible in said magnetic flux circuit in the course of displacement of said permanent magnet means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |