US3765390A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Solid state breakerless ignition system for internal combustion engines
Assignee: Bendix Corp
•
Filing: 1971-03-10
•
Granted: 1973-10-16
•
Expires: 1991-03-10
Abstract
Abstract A breakerless ignition system designed for installation on one and two cylinder spark ignited large horizontal engines having a flywheel. The ignition system is comprised of: a ferromagnetic flux conducting plate mounted on the flywheel of the engine; a stator assembly mounted on the engine, having a coil and a magnetic field responsive to the movement of the plate so that when the flywheel revolves and the flux conducting plate passes the stator assembly a voltage pulse is induced in the coil; and a control circuit for receiving and applying the voltage pulse induced in the coil to the spark plug at predetermined intervals. The control circuit is capable of advancing and retarding the engine spark as the speed of the engine changes.
Inventors
- 👤 D Loudon
- 👤 H Bernhardt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:34
CPC Classifications
F; F02; F02P; F02P1/00; F02P1/08; F02P1/086
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
202 words
In combination with an internal combustion engine of the type having a flywheel and a spark plug to ignite fuel in the engine, a breakerless ignition system comprising: a non-magnetized magnetic flux conducting plate mounted on the flywheel of said engine; a stator assembly having a coil and a magnetic field responsive to the movement of said plate, said stator assembly including a generally C-shaped configuration comprised of: a first magnetic flux conducting member; a second magnetic flux conducting member in generally parallel relationship to and spaced from said first member; a third magnetic flux conducting member disposed between and generally perpendicular to said first and second members to form said generally C-shaped configuration; and wherein said stator coil is dis-posed around a portion of said first member; and wherein said second member includes a permanent magnet disposed so that the magnet''s polar axis is perpendicular to said third member; means for mounting said stator assembly adjacent to the flywheel so that when the flywheel revolves and said plate passes said stator assembly a voltage pulse is induced in the coil; and control means for receiving and applying the voltage pulse from said coil to said spark plug in a predetermined manner.
Claim 2
Dependent Claim
202 words
In combination with an internal combustion engine of the type having a flywheel and a spark plug to ignite fuel in the engine, a breakerless ignition system comprising: a non-magnetized magnetic flux conducting plate mounted on the flywheel of said engine; a stator assembly having a coil and a magnetic field responsive to the movement of said plate, said stator assembly including a generally C-shaped configuration comprised of: a first magnetic flux conducting member; a second magnetic flux conducting member in generally parallel relationship to and spaced from said first member; a third magnetic flux conducting member disposed between and generally perpendicular to said first and second members to form said generally C-shaped configuration; and wherein said stator coil is dis-posed around a portion of said first member; and wherein said second member includes a permanent magnet disposed so that the magnet''s polar axis is perpendicular to said third member; means for mounting said stator assembly adjacent to the flywheel so that when the flywheel revolves and said plate passes said stator assembly a voltage pulse is induced in the coil; and control means for receiving and applying the voltage pulse from said coil to said spark plug in a predetermined manner.
Claim 3
Dependent Claim
56 words
The combination as recited in claim 1 wherein said control means includes an ignition coil for amplifying the pulses received from said stator coil before applying them to said spark plug, said ignition coil having a primary winding in circuit relationship with said stator coil and a secondary winding in circuit relationship with said spark plug.
Claim 4
Dependent Claim
144 words
The combination as recited in claim 2 wherein said control means comprises: a capacitor in circuit relationship with said stator coil and the primary winding of said ignition coil; a circuit for periodically discharging said capacitor through the primary winding of said ignition coil, said circuit including a solid state electronic switching device selectively rendered electrically conductive to permit discharge of said capacitor through the primary winding of said ignition coil and nonconductive to permit charging of said capacitor by the voltage pulses produced by said stator coil, said switching device having an anode, a cathode and a control electrode; and trigger means for controlling said solid state switching device, said trigger means including means for generating trigger pulses having a repetition rate dependent upon the angular velocity of said flywheel and out of phase with said voltage pulses produced by said stator coil.
Claim 5
Dependent Claim
126 words
The combination as recited in claim 3 wherein said means for generating trigger pulses includes a metal trigger pin mounted On said flywheel and a second stator assembly having a coil and a permanent magnet in electromagnetic relationship, said second stator coil electrically responsive to movement of said trigger pin and in circuit relationship with the cathode and control electrode of said solid state switching device, said second stator assembly mounted adjacent said flywheel so that when said flywheel revolves and said metal trigger pin passes said second stator coil, a voltage is induced in said coil causing the solid state switching device to conduct thereby permitting the capacitor to discharge through the primary winding of said ignition coil and supply energy to said spark plug.
Claim 6
Dependent Claim
88 words
The combination as recited in claim 4 wherein said means for generating trigger pulses includes a second metal trigger pin angularly spaced from said first trigger pin in the direction of rotation of the flywheel, said second trigger pin having a greater clearance from said second stator assembly than said first trigger pin so that as the angular velocity of said flywheel increases the trigger pulses generated by said second trigger pin passing said second stator assembly increases to sufficient magnitude to trigger said solid state control device.
Claim 7
Dependent Claim
21 words
The combination as recited in claim 5 wherein there are a plurality of nonmagnetized flux conducting plates mounted on the flywheel.
References Cited (Backward Citations)
US2980093A
Cited
US3251351A
Cited
US3356896A
Cited
US3500809A
Cited
US3490426A
Cited
US3599615A
Cited
US3623467A
Cited
US3619634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |