US1904799A - Pump mechanism - Google Patents

Description

Patented Apr. l8,

UNITED STATES. PATENT omen HARRY A. PALMER, OI BOSTON, ASSIGKOB TO more INCORPORATE), A CORPORATION 01' rune Application fled Alix-11', 1938. Serial No.

This invention relates to a pump mechanism designed primarily for supplying fuel to the combustion chamber of an internal combustion; engine, but it is to be understood thata pump mechanism, in accordance with this invention may be employed in any connection for which itis found applicable, ,and the invention has for its object to provide, in

a manner as hereinafter-set forth, a mecha- 19 nism of the class referred to so constructed and arranged whereby its intake action for .the fuel will be had on the compression stroke of the engine and the ex lling action of the pump for injecting the el into the combuson and before the completion of .the compression stroke of the engine.

A further object of he invention is to provide, a pumping mechanism for the purpose set forth, including a plunger element, acting to seal the intake to and outlet from the plunger chamber of the pumi until the start of the compression stroke of t e engine there by preventing'leakage and siphoning of oil during the other cycles of the engine."

A further object of the invention is to pro- I vide, in a manner as hereinafter set forth, a mechanism of the class referred to'including an oil expelling plunger. acting to instantly cut off the fuel to the plunger c amber at-the expiration of the :ex'pelling action of. the

y A further object of the invention is to rovide, in a manner as hereinafter set fort a pumping mechanism having itsioperation for intaking fuel thereto for expulsion to the combustion chamber of the engine, so timed to prevent the fuel intakingpperation of a com-. bined fuel intaking and el expelling plunger until the piston of the engine starts .up on its compresslon stroke. I

To the above ends essentially and to others which m'ayhereinafter appear, the invention consists of such parts, and such combination of parts which invention as claimed.

The pumping mechanism as hereinafter more specifically referred to is similar to that disclosed in my co-pending application, part Serial Number 608,329, filed April 29, 1932.

A I In the drawings:

tion chamber of the engine will also be had all within the scope of the Figure 1 is a lengthwise sectional view of Y Y.

a fuel pumping'mechanism in accordance-Q with thisfinvention illustrating'theplunger of the mechanism in fuel intaking position. T

' Figure 2 is a section on line 2-2 Figure 3 is a sectional view taken at right angles to Figure 1. f 3

Figure 4 is a s'ection on line 44; Figure 3. Figure 5 is a fragmentary view in'section 00 online5--5Figure 6. n v Figure 6 is a-view similar to Figure 1, illustratin the plunger of the mechanism atthe end 0 its expelling stroke.

Figure 7 is a fragmentary view ,in section. on line 7-7 Figure 6; Referring to the drawings, 1 indicates a pump casing open at its topand formed with abottom 2 provided with a central enlarged. opening 3. Extended from casing 1 is a pair of spacedparallel arms 4, 5, the former is provided with. an opening 6 in which is arranged] .aneccentric bearing 7.

s d b Tlie arm 54hasard1 o nin'S. u o e yt earms ,5' an T 'm sunt l thereifi is a throttle shaft'9,formed 7 ofan enlarged intermediate pa'rtlO and a. pair of reducedend parts 11, 12. Thepart 10 has one end thereof seated in opening 8. Theendpart 11 extends through'bearingcollar 7 and carries alock ring 13, Thepart 12 has connected thereto, by the binding screw 14 a control .15for shaft 9. The bearing 7- .is keyed topart 11 of shaft 9. The purpose of bearing 7 will be presently referred to.

,Seated on the open top of and extended into casing 1 is apump body 16 formed of a centrally circular apertured head.part 17 and 'acylindrical guide part 18, the former bein of .a width greater than the diameter-of an integral at its inner end with the latter. The 99 wall of the aperture or inner side ofpart 17 is upon two different diameters. That pertion of the inner side ofpart 17 .of-greatest inner diameter is'indicated at 19 and that portion of smallest inner diameter at 20. The.portion 19 is of less length than portion. 1 20, and opens at the outer end of the'headpart 17. "The providing of the inner side of 17 of two difierent diameters forms 'an internal shoulder orseat 21. Theportion 19 9 of the inner side ofpart 17 is threaded. The inner diameter ofpart 18 is uniform throughout and is the same as and forms a continuation of theportion 20 of the inner side ofpart 17.. The latter is rabbeted on its outer side, as at 22 to provide forpart 17 to seat on the outer end edge of and extend into the casing 1. Thepump body 16 is secured to I casing 1 byholdfast devices 23. A part of the portion of the inner side ofpart 17 and the entire inner side ofpart 18 provides achamber 24 for a combined fuel intaking and fuel expellingreciprocatory plunger 25 which has a snug sliding fit with the wall ofchamber 24. The latter isopen at its inner end and closed at its outer end by a peripherally threaded andshouldered plug 26 formed with aport 27 extending from the inner end of and opening into avalve pocket 28 formed in theplug intermediate its ends. Theplug 26 is formed with anannular opening 29 of greater diameter than and which opens at its inner end intopocket 28. The outer end of opening 29 communicates with acavity 30 formed in the outer end ofplug 26. The wall of opening 29 is threaded. Theplug 26 has a reducedinner part 26 which extends into theportion 19 of the inner side ofpart 17 ofpump body 16. The peripheral shoulder of the plug engages a packing 26" mounted onseat 21. The threads of the plug engage with the threadedportion 19 of the inner side of thepump body 16. Theplug 26 extends outwardly from the latter.

Secured to the wall of opening 29 is a tubulax-coupling member 31 formed of an intermediate, an outer and aninner part 32, 33

and 34 respectively. Thepart 32 is of greater diameter thanparts 33, 34. The part-33 is of greater outer diameter thanpart 34. The inner diameter ofparts 32, 33 is the same, but of less diameter than the inner diameter ofpart 34. Theparts 33, 34 are peripherally threaded. Thepart 34 engages with the wall of opening 29 and has its innerdiameter the same as the diameter ofpocket 28.Part 32 is arranged within and extends fromcavity 30. At the point of mergence ofpart 34 withpart 32, avalve seat 35 is formed for a portedvalve 36 of T-shape cross section. Arranged withinpart 34, surrounding the stem ofvalve 36 and interposed between the head of the latter and acheck valve 37 is acontrolling spring 38. Thevalve 37 is normally ar-.

ranged inpocket 29. The stem ofvalve 36 is spaced fromvalve 37 and constitutes a stop for the arresting of the opening movement of the latter. Extended into the outer end ofpart 33 is afuel conducting pipe 39 which leads to an ejector nozzle, not shown, for extension into the combustion chamber, not shown, of the engine. A packing 40 surroundspipe 38 and is seated on the outer edge ofpart 33. A packinggland 41 surroundspipe 39, encloses packing 40 and threadedly posed at right angles tochamber 24 and has I 1ts top wall 43' below and in very close proximity to the inner end ofplug 26. The bottom wall 44 ofchamber 42 is arranged in close proximity to the inner end ofplug 26. Communication is had between thechamber 42 and the upper end ofchamber 24 by a series of spacedports 45 in thewall 43. The arrangement is such that when theplunger 25 moves inwardly about .006 of an inch, the intake from chamber 42' tochamber 24 starts. Thepart 17 ofpump body 16 is formed with acircular opening 46 having the wall thereof threaded for securing thereto a fuel supply nozzle 47 Theopening 46 communicates with the open outer end ofchamber 42 and nozzle 47 llkewise. The nozzle 47 comprises atubular body portion 48 having an enlargedouter part 49 and a reducedinner part 50, the latter being peripherally threadedto secure it to the threaded wall ofopening 46. Arranged withinpart 49 is a collar'51 carrying avalve stop 52. Positioned inpart 49 and bearing against the outer end edge ofcollar 51, is asleeve 53, having its inner end formed with a valve seat 54. The outer end 55 ofsleeve 53 is beveled. Slidably mounted insleeve 53 is the stem of acheck valve 56 which coacts with the seat 54 for closing thenozzle 49 to supply and to arrest any outward expulsion of the fuel fromchamber 42 from passing to the supply orfeed pipe 57, which is clamped against the outerend ofsleeve 53 by'aitubular plug 58, mounted onpipe 57 and threadedly engaging with the inner, face ofpart 49 at the outer end of the latter.

Theplunger 25 is formed with an annularperipheral shoulder 59 for a purpose to be referred to. Surrounding and extending inwardly from the part 18-of thepump body 16, is areciprocatory driver 60 for theplunger 25, and which acts upon. the latter to provide its fuel expelling stroke. Thedriver 60 coacts with theshoulder 59. Thedriver 60 includes asleeve 61 formed at its outer end with an outwardly directed annular flange Thedriver 61 and is interposed betweenflange 62 and thebottom 2 of easing er 25, areabutment mem rs 68 each avin a flat workingsurface 69..

Pivotally mounted onart 11 of shaft 9,

is a pawl 70 for shiftingp unger 25 inwardly to provide fordriver 60 to compress spring bifurcated inner part to form a pair 0 64. The pawl includes a centrally aperturedintermediate part 71, an outer end part 72 formed with a and a Spaced arms 74 for straddlin the 'portion- 65 ofplunger 25. Thearms 4 haveflat working surfaces 7 5v for seating upon the working surepending nose 73f,

faces 69 of theabutment members 68,' The arms 74 are maintained againstsurfaces 69 by a retaining s ring 76 which surrounds the 'irmer portion 0plunger 25 and is interposed betweenflange 63 and the upper edges of arms74. a p Arranged adjacent to and below shaft 9 is astationa 78, 78' and aving a peripheral combined sto andspacing boss 7 9.in proximity to one en Thesupport 78 carries a combined spacing and stopsleeve 80. Revolubly mounted on shaft 77 betweenbos 79 andcollar 80 is acam operating shaft 81. The

cam, indicatedat 821s 1nte al withshaft 81 at one end of the latter. tegral with the other end ofshaft 81 is anpheral collar 83. encompassed and driven om adriver 84, which is connected to and operated from any suitable means, not shown, actuated from the engine. The arrangement is to be such thatshaft 81,cam 82, collar-83 anddriver 84 will revolve tofi ther bodily, except when the engine back- The driver The-collar 83 is cut out on one side, as at 86 to provide a shoulder 87. 1 Arran with-. in pocket and engaging the shou der 87 is a. spring controlledlatch 88 which couples the collar anddriver 84 together to provide for the bodily movement re erred to. When 50 the engine backfires and reverses, the moveopposite y disposedlobes 91, 92.

ment-ofdriver 84, thecam shaft 81 remainsstationa ,.until thedriver 84 operates-in its normal irectionand the latch-88 engages shoulder 87 Thecam 82 isformed with a pair of ogpositelf disposed workingsurfaces 89, 90 w 1ch gr uall rise and terminate into a pair of The nose 73 of pawl 70, travels successively upon thesurfaces 89, 90" from the low part to the. high part of the latter, whereby the pawl 70 is shifted pn its shaft 9. in a manner to lower the; arms74 thereof, .until the nose 73 clears [the lobes anddrops u n the low parts of thesurfaces 89,90. en the v plun chamber 24.- shaft 77 mounted in supports es'fand'causes the driver to operatereversely.i c 84 is formed withapocket 85.

W170 is shifted to lower its arms 74, the. atter themembers 68, will 7 shift theplunger 25 inwardly to open the fuel intake chamber Q to the chamber '24 drawingfuel into the latter forwardly ofr 25. When the latter is moved inwar y, theshoulder 59 hearing againstflange 63, will carrydriver 60 therewith com-' Pm mg a lobe thednver 60 will be released andspring 64 acting upon the latter will projectspring 64. Upon the nose 73clear driver 60 outwardly, which carries theplunger 25 therewith and'provides the fuel expelling stroke for the latter. e

The foregoing operation is to be carried out duriinfilthe compression stroke of the en" ginea emechanism is so connected with the engine to provide for its operation'at the riod as referred to. Thepl Y r 25, after.

its fuel expellin' stroke will be. eld tightly against lug 26y 64 and 74, to preventl'anda 'cose'ports'45. Theport 27 in plug provides the outlet for l'x aThe cpntr'olshift th kc f g Permits r ius g c n re 0' the pump, 'due'tofthe' fact that such elements.providefor p p 82 so that the duration of the travelling 0011-. tact of the nomwithfthe camwill varyto change the-operatin stroke of the puin '7 be short the ump that the stro of that the travelling be long it inobvious pum 'willbeincreased.

atIclaimis:

:1. In a fuel pumping mechanism forinconnection with pawl70 relative to cam ternal combustion engines, a tubular structure having a part thereof of uniform inner diameterto provide a chamber for afuel in--' takeand expelling plunger, said chamber bei 1n open at its inner end, a-no closed f va ve controlled fuel outlet structure secured to the tubular structure and having-a reduced 1 portion extending into the outer portion and abutting the inner face of said: art to provide a normally closed a outer wall I for said chamber, said tubular ineluding a valve controlled fuel intake nor-- mall closed to a source of fuel su ply, said inta e a inwardly of an in very close proximity to said wall, at

right angles to the latter and opening into said chamber at the extreme outer end of plunger for intakin fuel into and for expelling it from sai mechanism, abutment means carriedv by and at each side of. one end of the plunger inwardly of said structure, a 5 pivot arranged adjacent to and forwardlyof said means, an actuable pawl pivotally mounted intermediate its ends on said pivot, said pawl including a bifurcated inner part bearing against said members for intermittently imparting a fuel intake stroke to the plunger against the action of the controlling spring for said structure, said pawl having its outer end provided with a depending nose, a rotatable cam arranged outwardly w1th respect to said pivot and coacting with said nose to actuate the pawl in a dlrection for intermittently imparting a fuel intake stroke to the plunger, said driving structure includingme'ans for intermittently imparting an expelling stroke to said plunger, a coiled spring encompassing the plunger and interposed between said structure and inner part of said pawl, said pivot being adjustable for varying the stroke of the plunger, means integral with the pivot for adjusting it, and supporting means common to said pivot and adjusting means.

In testimony whereof, I afiix my signature ereto. HARRY A.

Images