EP0483769A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Improved control valve and anchor for an electromagnetic internal combustion engine fuel injector

Assignee: Elasis SCpA

•

Filing: 1991-10-29

•

Granted: —

•

Expires: 2011-10-29

📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract A control valve (19) for an injector (10) comprising a valve body (38) having of a control chamber connected to a drain conduit via a hole (49) terminating at a flat surface (68) of the valve body (38). The plunger of the valve (19) consists of a plate (67) housed in a seat (66), the bottom wall (86) of which arrests the travel ("b") of the plate (67). This is controlled by the anchor (28) of an electromagnet (20), which anchor (28) presents a rod (31) arrested directly by an adjustable stop (78) after traveling a distance "a" greater than travel "b". The opening and closing time of the valve (19) is therefore unaffected by wear on the stop (78) of the anchor (28). The rod (31) of the anchor (28) is in one piece with a stem (37) activating the plate (67), and with a threaded portion (77) screwed to the anchor (28).

Inventors

👤 Mario Ricco
👤 Sisto Luigi De Matthaeis
👤 Rita Di Gioia

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-06 17:18

CPC Classifications

F; F02; F02M; F02M47/00; F02M47/02; F02M47/027; F02M61/00; F02M61/16; F02M61/168; F02M63/00; F02M63/0012; F02M63/0014; F02M63/0015; F02M63/0017; F02M63/0031; F02M63/0033; F02M63/004; F02M63/0043; F02M63/007; F02M63/0075; F02M2200/00; F02M2200/80; F02M2200/8076; F02M2200/8092

Claims Analysis

Total Claims: 8

Claim 1

Independent Claim 110 words

An electromagnetic internal combustion engine fuel injector comprising a control valve (19) for opening an injection nozzle (12) and in turn comprising a hole (49) connecting a control chamber (47) to a drain conduit (33), and a plunger (67) controlled by the anchor (28) of an electromagnet (20), stop means (78) being provided for arresting the travel (a) of said anchor (28) when attracted by said electromagnet (20); characterised by the fact that the travel of said plunger (67) is arrested by a stop (86) independent of said stop means (78) and such that the travel (b) of said plunger (67) is less than that (a) of said anchor (28).

Claim 2

Dependent Claim 67 words

An injector as claimed in Claim 1, wherein said anchor consists of a disc (28) integral with a rod (31), and wherein said stop means comprise an element (78) on an adjustable pin (79) coaxial with said rod (31); characterised by the fact that the free surface (83) of said element (78) is rounded and provides for directly arresting the free surface (82) of said rod (31).

Claim 3

Dependent Claim 79 words

An injector as claimed in Claim 2, characterised by the fact that said hole (49) terminates at a flat surface (68) of a valve member (38); said plunger consisting of a plate (67) having a flat face (70) mating with said flat surface (68); the opposite face (71) of said plate (67) being engaged by a stem (37) integral with said rod (31) and extending from the opposite side of said disc (28) in relation to said rod (31).

Claim 4

Dependent Claim 53 words

An injector as claimed in Claim 3, characterised by the fact that said rod (31) comprises a threaded portion (75) by which it is rigidly secured to said disc (28); said stem (37) being in one piece with said rod (31) and guided by a sleeve (54) fitted to said valve body (38).

Claim 5

Dependent Claim 59 words

An injector as claimed in Claim 4, characterised by the fact that said valve body (38) is sealed inside a hollow body (11) by means of a threaded ring nut (52) and a bell-shaped member (51) supporting said sleeve (54); said plate (67) moving inside a seat (66) formed in said bell-shaped member (51) and comprising said stop (86).

Claim 6

Dependent Claim 40 words

An injector as claimed in one of the foregoing Claims from 2 to 5, characterised by the fact that said hole (49) terminates in a larger-diameter portion (87) for increasing the discharge coefficient of the fuel from said chamber (47).

Claim 7

Dependent Claim 35 words

An injector as claimed in one of the foregoing Claims from 3 to 6, characterised by the fact that said plate (67) is substantially polygonal for facilitating the fall in pressure of said chamber (47).

Claim 8

Dependent Claim 25 words

An injector as claimed in Claim 7, characterised by the fact that said polygon comprises a series of alternating flat (89) and rounded (88) sides.

References Cited (Backward Citations)

DE2051944A1 Cited

WO1985001561A1 Cited

EP0385397A2 Cited

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag

Select Category

Notes (Optional)