US2633084A

US2633084A - Fuel injection pump

Info

Publication number: US2633084A
Application number: US50277A
Authority: US
Inventors: Robert A Lasley
Original assignee: LOUIS G SIMMONS
Current assignee: LOUIS G SIMMONS
Priority date: 1948-09-21
Filing date: 1948-09-21
Publication date: 1953-03-31
Anticipated expiration: 1970-03-31

Description

Patented Mar. 31, 1953 flpbertAuLasley-phibago, Ill., assignor, by mesne assignments; toyliouisfi. Simmnngflhicagmjll. Annlihaztiumseptemherzl, r948; serialcNo..5p;zg-'1 (Cl. mar-2.02

ro ;,isproyided;.wit ventaholeszinathez i o reventing @mpression: clients;- P. ody.- pening.uu mrl cipizocaethan tonzlandizspringtcum" Iluesztorzthe; eu eder oned imfllela niieetiomimlmps; Y .4 ilf past-the-pistom inevitable and fuel oil 7 gleakmsefromzztheapumps escapesithroush th=3V$Jl1;1hO1eS in the spring cup. In order to prevent objectionable dilution of th lu atinsroiii f theen ineers; the fuel oil eaka e, at empts have..heen,madestotcollectlth fuel oil" as it is discharged 'from rthesspring cupg vent-holes in an annular receptacle surrounding the push rod irrthe enginebloek -openings, but such attempts have not m ith sucoesseduee aree xz o hez aet thett a-h speed reeiproeae fth pus damlwthe- .umumistomoauses mpin econztheepushgodsend h. o lthuse olleetin ,omtheipusmrod woman's We on .thee ushirodandintosthe lubricatin ils t he eua ne,-.

Furthena erupts torpneventthisgobjectionable QhfillfiiQhhhW hyolveclflthe 111serof-3 splaslrguards or baflles of generally umbrella shape carried by the push rod, butsuch expedients likewise have not been successful because of the tendency of the leakage-oil collecting on the lower edge of the umbrella to work its way up the under' side of the umbrella and onto the push rod during reciprocation of the parts. It is a further object of this invention, therefore, to provide in a fuel injection pump an improved spring cup construction for insuring that the fuel oil leakage from the pump is effectively conducted to the receptacle therefor, whereby dilution of the lubricating oil of the engine is minimized. i In carrying out the invention in one form a oflthi s n peotivelyz pntain ngean.. mendin -fi d pump; of: the; clasm described provided-. with a sprin cup; in; Whifihn vent;h01es; are formed. in"; the; bottom: wall. immediately adjacent.- the outer edge? thereoii and: a: cylindrical.- sleeve extending;

from the bottom wall and disposed inwardly of the; vent holes; is: provided for: guiding; into: a receptacle;thefuel1oilrleakagesdischarged' through.- the vent; holes; the: sleeve being, of. greater. length. than; theg-axial displacement; of thesspring,

cup during; operation: oft. the pump For more; completeunderstanding; of; the in!" vention" reference should: now; be. had. to. the; drawing in: which t the; single; figure; is an e1e. va'.--= tional view; of; atfuelfiinjectiom pump; embodying;

they presentinvention; mounted, on; an. engines block, a p0rtion..of-:. theipump, and-thev bloclo. be:- ing; sectioned-1 along; the; axial. center: line; of: the: pump moteiclearly; to; illustrateethe construction;

Referring nowl totha-drawing;.theeinventiong-is shown asembodiediimaefueltiniectionpumpthavi gfpumn; body -zl 0'.- provided with an; annular: ex ternal flan e :1 Lby means of.iwhichstheipumpimay beasecured-zto,the:.engineb10ck.; l 2 by; suitable'voap boltss (not;.-sho.wn) t he: pump: body? I01 and. the: engines block; l2; being; provided;-: with aligned; openings; l'3- and.' 14;,respectively: Theiifuel injectionvpumpg,iissofeaatyp'e.generallytknown nithe arts anddncludes a; cylindertbarrele I-Se; the-flower:- endqof; which extends intofv thezlopening l3- and; a. recip ro.catableipistoml 6, the g-lowerend. of which extends from.-. the. cylinder barret 5,1, as; shown; Thee P1 1 11; is: of thei. type';in.. wh1ch: they; pump? function :iSz'iEtGhiGVEd .-by.;-thezreciprocating; move?" menta-of the-2 pistom I lip-and.- the amount of? :fuel'i deliyered in eachstrokeqiseadjusted byirotationof the piston, |6:i1'l-. the icylinderxbarrel't The manner in which the rotation Oi'TthEDi'StOIII-J is utilizedto 'controluthe-amount of; fuel delivered by the pump; will: bet. well understood--. by; those:

skilled; int. the. art. and; no detailed; explanation:

iss thoughttto; be .-.necessary; other; thanjtot. points. out that a longitudinally movable rack 11 is arranged to effect rotation of a sleeve [8 having a slot l9 adapted slidably to engage an upstanding finger 20 extending from a collar 2| which is rigidly secured to the piston IB. Adjacent its lower end the piston I6 is provided with a head 22 for receiving a spring retainer 23 adapted to be engaged by the lower end of a spring 24, the upper end of which bears against a spring retainer or washer 25 arranged to engage a suitable shoulder 26 formed in the pump body (0.

Surrounding the spring 24 and the lower end of the piston I6 is a spring cup 21 which slidably engages the walls of the pump body forming the opening l3. The bottom wall of the spring cup 21 engages the lower end of the piston l6 and the spring retainer 23 and is in turn engaged by an operating member or a push rod 28 which is adapted to be reciprocated in timed relation to the engine by suitable engine driven means (not shown). Disposed within the opening 14 in the engine block l2 and surrounding the push rod 28 is a guide 29 which is formed as shown to provide an annular channel or receptacle 30 surrounding the push rod. It will be understood that suitable outlet or drainage means (not shown) are provided for withdrawing from the annular receptacle 30 any fuel oil which accumulates therein.

During operation of the pump piston 16 by the push rod 28 the sprin cup 21 reciprocates in the opening l3 at high speed and in order to prevent compression efiects within the opening l3 of the pump body the bottom wall of the spring cup 27 must be provided with vent holes. In accordance with the present invention a series of vent holes 31 are provided disposed adjacent the outer peripheral edge of the bottom wall of the spring cup.

Although the piston 16 of the fuel pump is provided, in accordance with the usual practice, with a plurality of sealing grooves 32, it will be understood that oil leakage past the piston is inevitable under the high pressures developed by the pump and it will be apparent that such oil leakage will be discharged through the vent holes iii in the bottom wall of the spring cup 21. The vent holes 3| are disposed, as shown, immediately above the annular receptacle 30 and in order effectively to guide the oil leakage into the receptacle even though'the spring cup is reciprocating at high speed, a cylindrical sleeve 33 is provided, extending downwardly from the bottom wall of the spring cup, the sleeve 33 being disposed inwardly of the vent holes 3|. The length of the sleeve 33 exceeds the stroke of the pump and the push rod 28' and consequently oil leakage accumulating on the lower edge of the sleeve 33 cannot workits wayup the inner surface of the sleeve 33 to such an extent as to reach the push rod 28. Consequently the fuel oil which leaks from the pump and is discharged through the vent holes 3| will be substantially entirely confined to the receptacle 30 and dilution of the lubricating oil of the engine is avoided. While the sleeve 33 has been shown as having been formed'integrally with the'spring cup 21 it will, of course, be understood that this sleeve may be made as a separate part if desired and secured to the bottom wall of the spring cup in any suitable fashion.

While a particular embodiment of the invention has been shown, it will be understood, of course, that the invention is not to be limited thereto, since many modifications may be made.

4 and it is contemplated, therefore, by the appended claims, to cover any such modifications as fall within the true spirit and scope of the invention.

What is desired to be secured by Letters Patent of the United States is:

1. A spring cup for a fuel injection pump of the class described, said spring cup having a vent hole in the bottom wall thereof disposed adjacent the outer edge of said bottom wall and a cylindrical'sleeve rigid with said cup extending from said bottom wall and disposed inwardly of said vent hole for guiding fuel leakage from said pump discharged from said cup through said vent hole.

2. A spring cup for a fuel injection pump of the class described, said spring cup having vent holes in the bottom wall thereof disposed adjacent the outer edge of said bottom wall and a cylindrical sleeve rigid with said cup and extending from said bottom wall disposed inwardly of said vent holes for guiding fuel leakage from said pump discharged from said cup through said vent holes, said sleeve being movable with said cup and having a length greater than the axial displacement of said spring cup during operation of said pump.

3. A spring cup for a fuel injection pump of the class described, said spring cup having vent holes in the bottom wall thereof disposed adjacent the outer edge of said bottom wall and a cylindrical sleeve rigid with and extending from said bottom Wall immediately adjacent and inwardly of said vent holes for guiding fuel leakage from said pump discharged through said vent holes.

4. A spring cup for a fuel injection pump of the class described, said spring cup having vent holes in the bottom wall thereof disposed ad: jacent the outer edge of said bottom wall and a cylindrical sleeve rigid with said cup and extending from said bottom wall immediately adjacent and inwardly of said vent holes for guiding fuel leakage from said pump discharged through said vent holes, said sleeve being longer than the stroke of the pump.

ROBERT A. LASLEY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 2,414,267 Meitzler Jan. 14, 1947