US2146205A

US2146205A - Filter

Info

Publication number: US2146205A
Application number: US142616A
Authority: US
Inventors: Herbert C Edwards; Albert F Campbell
Original assignee: Timken Roller Bearing Co
Current assignee: Timken Co
Priority date: 1937-05-14
Filing date: 1937-05-14
Publication date: 1939-02-07
Anticipated expiration: 1956-02-07

Description

Feb.. 7 1939.y H. c. EDWARDS ET AL 2,146,205

' FILTER I Filed May 14, 19,37

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UNITED STATES PATENT oFFicE ken Roller Bearing corporation of hio Company, Canton, Ohio, a

Application May 14. 1937, serian No. 14am calme. (o1. cremes) E f spe'ctive semi-cylindrical, end pieces` or dams 8 This invention relates to filters, particularly filters for the injection systems of internal combustion engines.' of the Diesel type.- It has for its principalobjcts to provide the fuel supply passageway of such a system with a simple and A eihcient lter of economical construction and vcompact.' design. `.The invention consists in .the-

iilterin'g element and in the construction, combi-r 'nations and arrangements of parts hereinafter described and claimed \In the accompanying drawing, which forms part of this specification and wherein like symvbols referto like parts Wherever they occur,

Fig. 1 1s a part sideelevauonal and part longif tudinal sectional vview of a fuel injector provided view similar to Fig. 1,

Fig,- 3 .is a central longitudinal section on the line 3--3 in F18. 2, i

Figs. 4 and 5' are cross-sections on the lines l 4 4 and 5 5, respectively, 'in Fig. 2; and

Fig. 6 is a perspective view of one of thel end, pieces for closing one end of the helical grooves of the filtering element. l For purposes of illustration, our invention is shown in and ,embodied in a fuel injector l of the kind used for supplying fluid'fuel to anV internal.

combustion engine of the compression-ignition type. Said injector has a fuel supply passageway 2 therein leading to a4 discharge -oriiice 3l corrtrolled by a spring-loaded, hydraulically operated plunger valve l. This construction of fuel injector' is well known and it is considered unnecessary to illustrate it in detail.

According to the present invention, the fuel supply jfpa'ssageway 2 haga cylindrical ltering element A mounted therein having double helicall` ribs 5 that tsaid passageway andform a helical inlet groove E anda helical outlet groove 1."

"I'he end of the helical inlet groove 6 that faces the direction ohfuel ilow is left open; and the opposite end of said groove is closed by a semidouble helical ri-b to the required diameter.

pressure supplied by the usual injection pumpcli` (not shown), enters the open end of the helical inlet groove 6 and follows said groove until stopped by the semi-cylindrical end piece or dani 8 -at the rear end thereof. 'I'he fuel, after filling said inlet groove is then forced bylthe pressure exerted thereon between the wall of the fuel supply passageway and the peripheral surface of the double helical rib 5 into the helical outlet groove 1 and thence iiows through the open end of said groove into said passageway. The double helical rib 5 is accurately ground to provide a fairly close iit in the fuel discharge passageway' li! and thus serves to hold back or strain out the sediment which might interfere with the operation of the injector, which sediment is retained in moved from the fuel supply passageway.

The hereinbefore described filtering device has several advantages; it can be easily and economi- N vcally manufactured; it is adapted for use in passageways of small diameter; it can be readily removed, cleaned and replaced; and the filtering action can -beeasily controlled by grinding the What we claim is:

` 1. A member 'a passageway with a smoth portion and means in said passageway for filtering fluid passing therethrough, said means comprising a member 'fitting the smooth portion of said passageway and having two external helical `grooves therein, one ofsaid grooves being closed at one end of said member and the other of said grooves being closed at the opposite end of said member, said member being made from a flat strip twisted into the form of a double helix having separate end members rigid therewith that constitute closures for said ends of said grooves;

2. A fuel injector having va. fuel delivery pas-- sageway with smooth portionand means in saidl passageway vfor ltering uid passing therethrough, said means comprising a member fitting the smooth portion of said passageway and having two external helical grooves therein, one of said grooves being closed at one end of said` member and the other of saidgrooves beingclosed at the opposite end of said member, said member being made frbm aat'strip twisted into the form of a double helix with its end portions left fiat and having semi-cylindrical members secured thereto that constitute closures i'or saidy ends of said grooves.

3. An element for a iter of the kind described comprising a thin strip twisted to form two helical grooves and having its ends left flat and members secured to said iiat ends `l'for closing one groove at one end of said element and the other groove atthe opposite end of said element.

4. An element for a illter of the kind described comprising a strip vof sheet metal twisted to form two helical grooves and having its ends lett iiat, semi-cylindrical end members for closing one groove at one end oi.' said element and the other groove at the other end of said element, said end members having slots therein adapted to receive the fiat ends of said strip, and welds for securing said ends in said slots.

5. A member having a passageway with a smooth portion and means in said passageway for mtering uid passing therethrough, said means comprising a. member fitting the smooth portion of said passageway and having two exthat constitute closures for said ends of said grooves, said members having slots therein adapted to receive the fiat ends of said strip, and welds for securing said ends in said slots.

HERBERT C. EDWARDS. ALBERT F. CAMPBELL