US3861373A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto ignition system for internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1974-03-08
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Granted: 1975-01-21
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Expires: 1994-03-08
Abstract
Abstract To provide for better uniformity of ignition pulses in capacitor discharge ignition systems, the magneto armature is formed with two windings of different numbers of turns which are both coupled to the charge circuit for the ignition capacitor, but uncoupled from each other by diodes, and a further control winding is wound on one of the cores associated with each one of the windings, connected in opposite phase with respect to the winding on the associated core, and electrically connected to trigger discharge of the capacitor through an ignition coil.
Inventors
- 👤 Heribert Allwang
- 👤 Georg Haubner
- 👤 Walter Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:20
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
224 words
Magneto ignition system for internal combustion engines comprising an armature (12), a rotating magnet (11) magnetically coupled to the armature, an ignition storage capacitor (20), a charging circuit (17, 18) connecting the capacitor and the armature to charge the capacitor, and a discharge circuit (26, 24, 27) including a discharge control winding (25) polarized oppositely to the armature and connected to the capacitor to discharge the capacitor through an ignition coil (21) to generate an ignition spark pulse for a spark plug (23), and wherein the armature comprises two individual cores (13, 14) and two windings (15, 16) each located on an individual core (13, 14); the charging circuit comprises diodes (17, 18) connected and poled to electrically uncouple said two windings (15, 16) from each other, characterized in that the numbers of turns of the windings (15, 16) are different to provide charge energy to the capacitor (20) over a wide range of engine speed; and in that the control winding (25) is a separate winding wound on one of said individual cores, and connected in phase opposition with respect to the winding on said one core to provide energy to control the discharge of the capacitor when no charge energy is required from the armature windings, and to generate said control energy independently of induction in any one of the armature windings.
Claim 2
Dependent Claim
224 words
Magneto ignition system for internal combustion engines comprising an armature (12), a rotating magnet (11) magnetically coupled to the armature, an ignition storage capacitor (20), a charging circuit (17, 18) connecting the capacitor and the armature to charge the capacitor, and a discharge circuit (26, 24, 27) including a discharge control winding (25) polarized oppositely to the armature and connected to the capacitor to discharge the capacitor through an ignition coil (21) to generate an ignition spark pulse for a spark plug (23), and wherein the armature comprises two individual cores (13, 14) and two windings (15, 16) each located on an individual core (13, 14); the charging circuit comprises diodes (17, 18) connected and poled to electrically uncouple said two windings (15, 16) from each other, characterized in that the numbers of turns of the windings (15, 16) are different to provide charge energy to the capacitor (20) over a wide range of engine speed; and in that the control winding (25) is a separate winding wound on one of said individual cores, and connected in phase opposition with respect to the winding on said one core to provide energy to control the discharge of the capacitor when no charge energy is required from the armature windings, and to generate said control energy independently of induction in any one of the armature windings.
Claim 3
Dependent Claim
36 words
System according to claim 1, wherein the cores (13, 14; 37, 38) have different cross-sectional area, the control winding (25x) and one of the armature windings (15x) being located on the core of greater cross-sectional area.
Claim 4
Dependent Claim
30 words
System according to claim 2, wherein the cores form the leg parts (37, 38) of a U-shaped core structure (36) in which the leg parts are of different cross-sectional area.
Claim 5
Dependent Claim
44 words
System according to claim 1, wherein the magnet (41, 42) is located at the inner surface of a hollow rotating structure (40); the armature cores (13, 14) are located within the hollow structure on chords with respect to the center of the rotation thereof.
Claim 6
Dependent Claim
39 words
System according to claim 4, wherein the armature cores are separate core elements; a carrier (44) and means securing the armature core elements to the carrier while providing for magnetic isolation of said cores with respect to each other.
Claim 7
Dependent Claim
26 words
System according to claim 4, wherein the armature cores are separate core elements (13, 14) located magnetically in parallel with respect to the magnet (41, 42).
Claim 8
Dependent Claim
26 words
System according to claim 1, wherein the control winding (25) is located on the core (14) carrying the winding (16) with the smaller number of turns.
Claim 9
Dependent Claim
29 words
System according to claim 1, wherein the cross-sectional area of the cores is different and the control winding (25) is located on the core with the smaller cross-sectional area.
Claim 10
Dependent Claim
34 words
System according to claim 1, wherein one, terminal, each, of both windings (15, 16) of the armature windings, and of the control winding (25) are commonly connected to ground, or chassis of the engine.
Claim 11
Dependent Claim
64 words
System according to claim 1, wherein the engine has a fly-wheel (40) having a cylindrical, hollow portion; the magnet (41) is located at the inner surface of the fly-wheel, and the armature cores are located inside said hollow portion, magnetically coupled to the magnet; a support carrier (44) facing said hollow portion; and non-magnetic attachment means (43) attaching the cores to the support portion.
Claim 12
Dependent Claim
70 words
System according to claim 10, wherein the cores are located adjacent and parallel to each other, spanning a chord of the cylindrical portion, and the attachment means comprises axially extending pins (43) passing through said cores, separating said cores from each other, while attaching both said cores to the carrier; the control winding (25) is located on the core (14) carrying the winding (16) with the smaller number of turns.
Claim 13
Dependent Claim
43 words
System according to claim 1, wherein the cores (13, 14) are of different cross-sectional area, and the winding (16) having the smaller number of turns, as well as the control winding (25) are located on the core (14) having the smaller cross-sectional area.
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) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |