US2088614A

US2088614A - Injection valve

Info

Publication number: US2088614A
Application number: US46707A
Authority: US
Inventors: Oscar W Schey
Original assignee: Individual
Current assignee: Individual
Priority date: 1935-10-25
Filing date: 1935-10-25
Publication date: 1937-08-03
Anticipated expiration: 1954-08-03

Description

Aug. 3, 1937. O w sc INJECTION VALVE Filed Oct. 25, 1955 Patented Aug. 3, 1937 more!) STATES PATET OFFICE 1 Claim.

(Granted under the act of March 3, 1883, as amended April 30, 1928; 370 O. G. 757) This invention relates to injection valves, and it has a particular relation to injection valves for supplying a fuel charge to the cylinder or combustion chamber of an engine of the Diesel or spark ignition types.

One of the objects of the present invention is the provision of an injection valve of simple and compact construction for delivering the fuel in properly atomized condition to the combustion chamber, where it may be ignited by the heat of compression or by an electric spark.

Another object of the invention is the provision of an injection valve of the character described, embodying a flexible diaphragm for controlling the flow of fuel to the combustion chamber and which may be deflected in controllable amounts to regulate the pressure required to open the same.

With these and other objects in View, as well as other advantages which may be incident to the use of the improvements, the invention consists of the parts and combinations thereof hereinafter set forth and claimed, with the understanding that the several necessary elements constituting the same may be varied in proportion and arrangement without departing from the nature and scope of the invention, as defined in the appended claim.

In order to make the invention more clearly understood, there are shown in the accompanying drawing means for carrying the invention into practical efiect, without limiting the improvements in their useful application to the particular construction, which, for purposes of explanation, have been made the subject of illustration.

In the accompanying drawing:

Fig. 1 is a view, partly in side elevation and partly in longitudinal section, of an injection valve embodying the present invention;

Fig. 2 is a plan view of the shim or spacing washer;

Fig. 3 is a plan view of the diaphragm;

Fig. 4 is a bottom plan view of the structure shown in Fig. 1, and,

Fig. 5 is an enlarged, fragmentary, longitudinal, sectional view of the lower portion of the valve.

Referring to the drawing, an injection valve constructed in accordance with the present invention is shown as comprising a hollow outer member I 0 provided with screw threads H for engagement with a threaded opening in the combustion chamber or manifold of a Diesel or spark ignition engine, and with a hexagonal portion l2 for engagement by a wrench. The member I0 is also'formed with an internal annular shoulder l3 and with an end wall I4 having a concave inner face l5 provided with a plurality of outlet apertures it. An inner member I! having threads I8 is threaded into the correspondingly threaded upper portion of the member ID, and is also formed with a hexagonal portion IQ for engagement by a wrench. The inner member I1 is also provided with an annular shoulder 20 for engagement with a shim or spacing washer 2!, which is seated upon the shoulder I 3, and also with a cylindrical lower portion 22 provided with an axial protuberance 23 for engagement with a metal diaphragm 24. This diaphragm is supported adjacent to the end wall M in bridging relation to the concavity l5 therein, and is provided with a plurality of ports 25 in registering with the outlet apertures H6. The diaphragm 24 is prevented from rotating and disturbing the alignment of the ports 25 with the apertures It by means of a'key 26 engageable with a notch 27 formed in the periphery of the diaphragm.

The inner member I! is provided with an axially disposed fuel inlet passage 28 which extends throughout the length of the member ID and opens through the protuberance 23 and also with an upper screw threaded portion 29 for attachment to a suitable fuel line.

The shim 2i is of such thickness that when the inner member I! is threaded into the outer member ID the protuberance 23 will deflect the diaphragm 24 into the concavity l5 of the wall M a slight distance, as shown in Fig. 5, and normally close the inner end of the fuel inlet passage 28. The pressure of the fuel, however, will flex the diaphragm 24 outwardly so as to permit fuel to pass from the inlet passageway 28 into the spaceabove the diaphragm and thence through the ports 25 therein to the space between the diaphragm and the end wall M, from where it escapes through the outlet apertures 16. The pressure at which the fuel is delivered may be regulated by varying the thickness of the shim H, which controls the initial deflection of the dia-' phragm 24.

From the foregoing it will be apparent that a Very simple and eflicient injection valve is provided in which the only surface requiring lap:- ping is the lower surface of the protuberance 23.

In the event that excess pressure should develop in the inlet passage 28 the diaphragm 24 will be flexed to a position in which it is supported throughout its area by the end wall I 4 which prevents any further movement thereof. This eliminates any possibility of the diaphragm becoming ruptured by undue flexing. During the 2 explosion of the charge in the cylinder the diaphragm 24 seats firmly against the protuberance 23 and effectually seals the inlet passage 28 against the escape of gas into the fuel line.

It will be understood that communication past the diaphragm 24 may be obtained by providing suitable ports in the side wall of the member 10 instead of in the diaphragm itself, and also that the protuberance 23 may be provided on the diaphragm 24 instead of on the cylindrical member 22. Also, it will be apparent that the shim 2| may be seated between the member 22 and the outer circumference of the diaphragm 24, if so desired.

Other modifications in the proportions and arrangement of the parts may be made by those skilled in the art without departing from the nature and scope of the invention, as set forth in the appended claim.

The invention described herein may be manufactured and used by or for the Government of the United States of America for governmental purposes without the payment of any royalties thereon or therefor.

What is claimed is:

An injection valve comprising a hollow element adapted to be inserted in the spark-plug opening of an internal combustion engine, and having an annular shoulder and an inner reentrant end wall provided with a fuel outlet; an inner member threaded into said hollow element in seating engagement with said shoulder and formed with a centrally disposed protuberance provided with a fuel inlet; a perforated diaphragm mounted in said hollow element and seated at the periphery of said end Wall for engagement with said protuberance and adapted to close said inlet when the pressure of the fuel therein decreases to a predetermined value and to be flexed away from said protuberance to open said inlet for the passage of fuel therethrough when the pressure of the fuel inlet increases to a predetermined value, said protuberance maintaining said diaphragm under an initial vdeflection; and spacing means interposed between said shoulder and said inner v member for varying such initial deflection.

OSCAR W. SCHEY.