Patent US3667686A successfully refreshed from Google Patents.
US3667686A
Expired / Lapsed
US
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Electromagnetic fuel injectors
Assignee: Roto Diesel SA
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Filing: 1970-08-26
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Granted: 1972-06-06
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Expires: 1990-08-26
Abstract
Abstract Electromagnetic fuel injector comprising a cylindrical body to which is attached an injection nozzle containing a sliding metering pintle in rigidly fixed relation to a movable armature or pallet which is attracted at each injection stroke of the cycle by an inductor formed of a magnetic core which carries a field winding and housed within the said injector body, wherein a stack of grain-oriented laminations which are cut out in the shape of and form the inductor core is clamped at the end nearest the movable pallet within a hole formed through a holding disc of non-magnetic material which is stationarily secured within the injector body and at the opposite end by the clamping lips of two strips of non-magnetic metal each located within one of the two recesses which form a separation between the three magnetic arms of the said core and accomodate the field winding which is placed round the central arm, that end of the stack of laminations which is directed towards the movable pallet and that face of the holding disc which is also directed towards the said pallet being placed level with each other so as to form a reference plane which constitutes one side of the airgap.
Inventors
- 👤 Georges Garnier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:48
CPC Classifications
F; F02; F02M; F02M51/00; F02M51/005; F02M51/06; F02M51/061; F02M51/0614; F02M51/0625; F02M51/0635; F02M51/0642; F02M51/0653; F02M61/00; F02M61/16; F02M61/168
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
200 words
An electromagnetic fuel injector comprising a cylindrical body to which is attached an injection nozzle containing a sliding metering pintle in rigidly fixed relation to a movable armature or pallet which is attracted at each injection stroke of the cycle by an inductor formed of a magnetic core which carries a field winding and housed within the said injector body, wherein a stack of grain-oriented laminations having the shape of form the inductor core which is clamped at the end nearest the movable pallet within a hole formed through a holding disc of nonmagnetic material which is stationarily secured within the injector body and at the opposite end by the clamping lips of two strips of non-magnetic metal each located within one of the two recesses which form a separation between the three magnetic arms of the said core and accommodate the field winding which is placed round the central arm, that end of the stack of laminations which is directed towards the movable pallet and that face of the holding disc which is also directed towards the said pallet being placed level with each other so as to form a reference plane which constitutes one side of the airgap.
Claim 2
Dependent Claim
200 words
An electromagnetic fuel injector comprising a cylindrical body to which is attached an injection nozzle containing a sliding metering pintle in rigidly fixed relation to a movable armature or pallet which is attracted at each injection stroke of the cycle by an inductor formed of a magnetic core which carries a field winding and housed within the said injector body, wherein a stack of grain-oriented laminations having the shape of form the inductor core which is clamped at the end nearest the movable pallet within a hole formed through a holding disc of nonmagnetic material which is stationarily secured within the injector body and at the opposite end by the clamping lips of two strips of non-magnetic metal each located within one of the two recesses which form a separation between the three magnetic arms of the said core and accommodate the field winding which is placed round the central arm, that end of the stack of laminations which is directed towards the movable pallet and that face of the holding disc which is also directed towards the said pallet being placed level with each other so as to form a reference plane which constitutes one side of the airgap.
Claim 3
Dependent Claim
93 words
An electromagnetic injector in accordance with claim 1, wherein the holding disc which supports the inductor core is rigidly fixed to the extremities of the arms formed by a tube which is bent into a U-shape, the central portion of the U being joined to the fuel inlet union which is secured by crimping within one extremity of the injector body whilst the said central portion of the U-shaped tube is pierced by a hole which provides a communication between the interior of the tube and the axial bore of the said union.
Claim 4
Dependent Claim
178 words
An electromagnetic injector in accordance with claim 2, wherein the space formed between on the one hand the inductor face which is remote from the movable pallet and on the other hand the central portion of the U-shaped tube is occupied by an insulating casing having a generally circular shape which corresponds to the shape of the interior of the injector body and being provided with connector pins for the supply of electric current which are fixed in a transverse partition wall and rear extremities of which are connected by soldering to the ends of the field winding of the inductor, the said insulating casing being further provided on the one hand with two diametrically opposite recesses for the insertion of the two lateral arms of the U-shaped tube and on the other hand with at least one through bore for the injection into the portion of the injector body which is occupied by the inductor of a synthetic resin which is admitted above the casing through an opening formed in the wall of the said injector body.
Claim 5
Dependent Claim
109 words
An electromagnetic injector in accordance with claim 1 wherein the extremity of the metering pintle which is located nearest the inductor has an enlarged rectaNgular head whose two opposite sides are provided with two flanges between which are mounted laminations constituting the pallet the other two opposite sides of the said pintle head being provided with two rectilineal grooves defining an enclosed space in conjunction with recesses provided in opposite lugs which are formed on the said laminations and fit over the pintle head, the said enclosed space being filled with plastic material whereby a rigid bond is formed between the said pintle head and the said pallet laminations.
Claim 6
Dependent Claim
100 words
An electromagnetic injector in accordance with claim 4, wherein the cheeks or flanges of the pintle head each have a flat portion which serves as a bearing surface for the inwardly bent central portion of a semi-circular restoring spring of steel wire whose extremities are inserted in slots of a spacer washer, the said washer being placed between the nozzle which is crimped within the injector body and the inductor holding disc and the said disc being applied against an internal annular shoulder of the said injector body, the arrangement being such that each restoring spring is stressed in torsion.
References Cited (Backward Citations)
US3288379A
Cited
US3224677A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |