US3669361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic fuel injectors for internal combustion engines
Assignee: Societe des Procedes Modernes dInjection SOPROMI
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Filing: 1970-07-09
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Granted: 1972-06-13
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Expires: 1990-07-09
Abstract
Abstract An electromagnetically controlled injector for internal combustion engines adapted to cut out the effects on uniformity of feed of all parasitic phenomena such as the rebounds of the needle and modifications in the pressure prevailing in the feed pipes. To this end, the liquid fuel is protected against the formation of waves by a throttling of the incoming liquid in a channel extending laterally of the stationary armature or else axially through the latter directly into the needle. Thus it is possible to obtain for the curve of injected fuel amounts vs. time a straight line between the desired minimum and maximum amount values.
Inventors
- 👤 Herve Gueret
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:37
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/06; F02M51/061; F02M51/0625; F02M51/0635; F02M51/0642; F02M51/0653; F02M51/0657; F02M51/08
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
214 words
An electromagnetic fuel injector for an internal combustion engine comprising an elongated body having a fuel input port and a fuel output port disposed adJacent the opposite ends thereof, a stationary armature mounted in the body, an electromagnetic winding for inducing flux in the stationary armature, a movable armature slidably mounted within the body for longitudinal movement to and from a closing position, the movable armature having a needle at one end thereof for closing the output port when the movable armature moves to the closing position, a fuel chamber surrounding the needle of the movable armature adjacent to the output port and being in communication with the fuel output port when the movable armature is moved from the closing position, the fuel chamber having a reduced volume, and an elongated fuel passage in the body extending from the fuel input port to the fuel chamber, the fuel passage having a small bore, the small bore of the fuel passage restricting the flow of fuel from the fuel output port when the movable armature initially moves from the closing position, thus reducing the amount of fuel per unit of time initially discharged from the fuel output port during the transient fuel flow period when the needle is initially moved from the fuel output port.
Claim 2
Dependent Claim
214 words
An electromagnetic fuel injector for an internal combustion engine comprising an elongated body having a fuel input port and a fuel output port disposed adJacent the opposite ends thereof, a stationary armature mounted in the body, an electromagnetic winding for inducing flux in the stationary armature, a movable armature slidably mounted within the body for longitudinal movement to and from a closing position, the movable armature having a needle at one end thereof for closing the output port when the movable armature moves to the closing position, a fuel chamber surrounding the needle of the movable armature adjacent to the output port and being in communication with the fuel output port when the movable armature is moved from the closing position, the fuel chamber having a reduced volume, and an elongated fuel passage in the body extending from the fuel input port to the fuel chamber, the fuel passage having a small bore, the small bore of the fuel passage restricting the flow of fuel from the fuel output port when the movable armature initially moves from the closing position, thus reducing the amount of fuel per unit of time initially discharged from the fuel output port during the transient fuel flow period when the needle is initially moved from the fuel output port.
Claim 3
Dependent Claim
18 words
An electromagnetic injector in accordance with claim 1 in which the fuel passage has an approximately uniform cross-section.
Claim 4
Dependent Claim
39 words
An electromagnetic fuel injector in accordance with claim 2 in which the fuel passage has a circular cross-section, the ratio of the length of the fuel passage to the diameter thereof being equal to or greater than about 10.
Claim 5
Dependent Claim
21 words
An electromagnetic fuel injector in accordance with claim 3 in which the diameter of the fuel passage is approximately 2 millimeters.
Claim 6
Dependent Claim
53 words
An electromagnetic fuel injector in accordance with claim 2 in which at least a substantial portion of the fuel passage extends along the longitudinal axis of the stationary and movable armatures, the movable armature having a port therein adjacent the needle for communicatively connecting the longitudinally extending fuel passage with the fuel chamber.
Claim 7
Dependent Claim
66 words
An electromagnetic fuel injector in accordance with claim 2 in which the body further comprises a space surrounding the movable armature, a first portion of the fuel passage communicatively connecting the fuel input port and the space, the first portion of the fuel passageway extending laterally around the electromagnetic winding, and a second portion of the fuel passage communicatively connecting the space and the fuel chamber.
Claim 8
Dependent Claim
209 words
An electromagnetic fuel injector in accordance with claim 1 wherein the body comprises an upper portion and a nozzle portion, the upper portion for mounting the stationary armature therein with a portion of the stationary armature adjacent one end thereof, the one end of the upper portion being adapted to engage the nozzle portion, the nozzle portion for mounting the movable armature for longitudinal movement therein, the nozzle portion engaging the upper portion for positioning the movable armature adjacent to but spaced apart from the stationary armature, the movable armature being biased against the nozzle portion, the nozzle portion being constructed of a material having a low thermal expansion coefficient, and a ring constructed of an amagnetic material being disposed between the upper portion and the nozzle portion and abutting a portion of the upper portion and another portion of the nozzle portion for spacing the nozzle portion with respect to the upper portion, the ring thus establishing the spaced apart relationship of the stationary armature and the movable armature, the combination of the amagnetic ring and the nozzle portion constructed of a material having a low thermal expansion coefficient for reducing the sensitivity of the fuel injector to expansion caused by magnetic field generated by the electromagnetic winding.
Claim 9
Dependent Claim
57 words
An electromagnetic fuel injector in accordance with claim 1 wherein the stationary armature has three parallel core members, the middle core member being surrounded by the electromagnetic winding, the stationary armature being laminated, The movable armature comprising a laminated plate having an upper surface adjacent to but spaced apart from the lower surface of the stationary armature.
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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |