US3043228A - Liquid pump - Google Patents

Description

July 10, 1962 w. 1 BENNETT LIQUID PUMP 5 Sheets-Sheet 1 Filed Feb. 20. 1958 5m N Nm QQ` July 10, 1962 w` L. BENNETT LIQUID PUMP Filed Feb. 20', 1958 3 Sheets-Shea?I 2 Worthy L. Bennett INVENTOR.

Y WWE/ms `July 10, 1962 w. BENNETT v 3,043,228 l LIQUID PUMP v Filed Feb. 20. 1958 3 Sheets-Sheet 5 Worf/1y L. Ben/7e# zNI/ENTOR.

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United States Patent Y antigas Patented .Fiuiy l0, 1952 dice 3,0335228 LFQUED PUMP Worthy L. Bennett, R0. Box 425, Cottonwood, Ariz., assigner of one-quarter to Ii. Norton, Cottonwood, Ariz.

Filed Feb. 2G, i958, Ser. No. 7l,4l1 6 Ciaims. (Cl. 10S- 38) This invention relates in general to new and useful improvements in pump construction, and more specically to an improved pu-mp of the metering type.

The primary object of this invention is to provide an improved liquid pump, the pump being so constructed whereby one basic design may be used for the manufacture of a multiple unit pump whereby a multiple unit pump may be constructed with any desired number of pump units without changing the basic design thereof.

Another object of this invention is to provide a liquid pump of the multiple pump unit type, the liquid pump being driven by a rotary drive shaft and there being a cam carried by the drive shaft drivingly connected to the pump units whereby the pump units are actuated in sequence.

Another object of this invention is to provide a multiple unit liquid pump of the metering type, the liquid pump including a plurality of individual identical pump units, each of the pump units being driven by means of a lever, there being a single cam engaging the levers of the pump units whereby one cam serves to operate all of the pump units, the pump units being operated in sequence.

A further object of this invention is to provide an improved liquid pump of the metering type, the liquid pump including a plurality of individual pump units, and there being drive means for operating the pump units in sequence with the volume of liquid pumped by the pump units being controllable.

A still further object of this invention is to provide an improved liquid pump of the type which includes a drive housing section having rotatably journaled therein a drive shaft and defining an axially elongated stroke adjustment chamber aligned with a chamber formed in a second housing section having a plurality of radially disposed individual pump units, the pump units being disposed in circumferentially spaced relation and being arranged axially with respect to the drive shaft, there being a lever for operating each of the pump units with equal strokes because of an axial support which pivotally mounts the levers in equal radial relation to the drive shaft journaled therein, there being a single cam carried by the drive shaft engaged with the levers remote from the pump units within the elongated stroke adjustment chamber for rocking the levers, the cam being shiftable longitudinally of said drive shaft and having a tapered surface whereby the eective strokes of the pump units may be varied with the degree of iineness desirable for metering apparatus, because ofthe axial length of the adjustment chamber and the equal -stroke levers.

These together with other objects and advantages which will become subsequently apparent reside in the details of Vconstruction and operation as more fully hereinafter described and claimed, reference being had Vto the accompanying drawings forming a part hereof, wherein like numerals refer to likeparts throughout, and in whichz' FIGURE `1 is a longitudinal sectional view taken through the liquid pump which is the subject of this invention and shows the general arrangement of the components thereof, the drive'cam being shown in a Yminimum stroke position in solid lines, and in a maximum stroke position by dotted lines; l

FIGURE 2 is a transverse sectional view taken sub- 2 stantially upon the plane indicated by the section line 2--2 of FIGURE l and shows the arrangement of the pistons of the pump units with respect to the drive shaft, there also being shown the mounting of the levers;

FIGURE 3 is an enlarged fragmentary sectional view taken substantially upon the plane indicated by the section line 3 3 of FIGURE 1 and shows the speciiic details of one of the pump units;

FIGURE 4 is a transverse sectional view taken substantially upon the plane indicated by the section line 4-4 of FIGURE 1 and shows the relationship of the levers with respect to the drive cam;

FIGURE 5 is an enlarged fragmentary sectional view taken substantially upon the plane indicated by the section line 5-5 of FIGURE 3 and shows the general cross section of the cylinder in the vicinity of the valve unit thereof;

FIGURE 6 is an enlarged perspective view of one or the valve bodies removed from its respective cylinder; and

FIGURE 7 lis an enlarged perspective View of one of the pistons removed from its respective cylinder.

Referring now to the drawings in detail, it will be seen that there is illustrated the liquid pump, which is the subject of this invention, the liquid pump being referred to in general by the reference numeral 10. The liquid pump 19 includes a housing which is referred to in general by the reference numeral 1-2. The housing :12 is made in two halves and includes a first half 14 and a second half The first half 14 is generally cylindrical in cross section, as is best shown in FIGURE 4, and includes an elongated body 18 defining a pump drive and stroke adjustment chamber which has the right end thereof, Aas viewed in FIGURE l, closed by a relatively thick end Wall 20'.

= The left end of the body 18 terminates in an outwardly projecting annular connecting ange 22.

The half 16 of the housing l2 is also circular in cross section defining a pump chamber, .as is best illustrated in FIGURE 2. The housing half 16 is provided with an annular recess 24 in that face thereof which opposes the housing half :14. The connecting iiange Z2 is seated in the annular recess 24 for accurately Valigning the pump and adjustment chambers and, is secured to the housing half 16 by means of a plurality of circumferentially spaced bolts 26.

As is best shown in FIGURES l and 2, the housing half'16 is hollow, the housing half 16 having a circular cross sectional opening therein. The housing half 16 is also provided with a plurality of circumferentially spaced axially arranged bores 28. The -bores 28 have internally threaded outer portions 30 and 'each of the bores 28 is provided adjacent its inner end with an annular recess 32 in which is seated an O-ring 34. Disposed intermediate the ends of each of the bores 23 is an annular recess 36 in which there is positioned a second O-ring 38.

Seated in each of the bores ZS is a pump unit which is referred to in general by the reference numeral 40. Each pump unit 4d includes a cylinder 42. Each cylinder 42 has an elongated body portion '44 which is provided adjacent the outer endl thereof with external threads 46 which mesh with the internal threads 30 to hold the cylinder 42 in the bore 2.8. The body portion 44 engages the O-rings E4 and 3S to form a sealwith respect to the walls of the bore 28. The outer part of each* of the cylinders 42 is in the `form of a nut portion 48 to facilitate the insertion and removal of the cylinder 42. The cylinder. V4Z is` further sealed with respect to the bore 2S by means of a gasket Si) disposedbetween'the nut portion 4S and the exterior surface of the housing half 16.

The cylinder 42 has an intermediate longitudinal bore 52 which defines a cylinder area for a piston S4. The

vcharge lines 11,18'Wil1 go to combustion engine.

piston 54 includes an extension 56 which extends inwardly into the housing half 16 beyond the cylinder 42.

As is best shown in FIGURES 3 and 7, eachV of the Y pistons 54 includes a piston portion 58 which is provided in the end thereof remote from the projecting portion 56 with a seat 60'. Disposed adjacent theend of the piston 8 in which the seat 60 is formed is an annular liquid receiving groove 62 whose purpose will beset forth in'detajl hereinafter. Also, there is provided an annular groove 64 in which there is seated an 0-ring 66. The

O-ring 66engages with the wall of the bore 52 to form Y a seal therewith and prevent the escape of liquid past the piston heads 58.

-The inner end of the cylinder 42 is provided with an enlarged bore 70 in which there is seated a seal 72. The seal 72Y engages the projecting portion 56 to bot seal and guide the piston 54.

Ihe outer end of the cylinder 42 is also provided with an enlarged bore 74. Thebore 74, however, is relatively deep and has seated thereina'valve housing 76. The valve housing 76 is retained in the bore 74 by turning down -a central part of the nut portion 48, as at 78.

The valve housing 76 includes a fluid inlet passage 80 YVand al uid outlet passage 82, the passages 86 `and 82 Y being disposed in parallel relation. sage 80 terminates in a reduced inner portion 83 which The huid inlet pasopens into the bore 52 of the cylinder 42 outwardly of the piston 54. The passage S0 includes an outer externally Vthreaded portion 84. Carried bythe externally threaded portion 84 is a ow control plug S6 through which there is a fluid passage 88. Also engaged in the threaded portion 84 is a fitting 98 which secures to the valve housing or valve block 76 afluid supply line 92.

The inner end of the plugV 88 is provided with a valve seat 94 for a ball check valve 96. The ball. check valve u 4 Y right end of the lever support 124 is in the form of a flange 128 which has vformed therein a plurality of circumferentially spaced axially extending slots 130. Disposed in each of the slots 130 is an enlarged central part 138 of a lever 132. It is t0 be understood that there is one slot 130 and one lever 132 for each of the pump units 40. Each lever 132 includes a irst end 13'4 which is aligned with the projecting portion 56 of its respective piston '54 and is engagedVV therewith. The iirst end 134 is rounded as fat 136 to eliminate friction between the piston projecting portion 56 and the lever :132 as the lever 132 is rocked. Incidentally, the lever 132 is pivotally mounted on a transverse pin 140 carried by the flange 128 in-substantial axial alignment with the dividing plane between the housing sections 14 and 16. Each of the projecting portions 56 is retained in engagement with its respective lever 132 by means of aV compression spring 142 disposed in the bore 52 and extending between the valve housing 76 and its respective piston 54, the spring 142 being seated in the seat 60. All of the levers '132 are therefore pivotally carried in equal radii relation to a central axis through the pump chamber.

The end wall 20 is provided in the extreme right hand end thereof with a recess 144 in which there Vis seated av bearing 146. The bearing 146 rotatably journals a drive shaft 148 extending through the housing 12 and disposed concentric with the longitudinal axis of the housing 12. The lever support 124 is provided'in the right end thereof, as viewed in FIGURE l, with a bore 150' in which there is seated a bearing 152. `Rota'tably journaled in the bearing 152 is a reduced left end 154 of the drive shaft 148 accordingly aligning the drive axis with the pump chamber axis so as to insure equal displacement of all 96 is urged into engagement with the valve seat 94 by Y means of a coilrspring `98.

The fluid passage 82 is provided at the other end thereof with an internally threaded'portion 100. Threadedly engaged in the inner part of the internally threaded por- 'tion 100 is a'plug 102 having a restricted iluid passage 104 therethrough. |Removably seated in the outer part -of the threaded portion 10i) is a fitting Y106 which con-V nects a discharge line 108 to the valve housing 76.V Y

Y The outlet passage l82 terminates at its inner end in an opening :110 which lopens into that portion of the bore `52Y above the piston 54. 'I'he inner end of the outlet Y Vand the plug V102.

-In order that'fluid may be supplied to the pump units Y40, there is carried by the housing half 16 an annular fluid supply manifold 118. The manifold 118 has conv nected thereto fthe fluid supply lines '92. The iluid discharge lines 108 may go to any desired source. However, if'the pump 10 is to Ibe used in conjunction with an in- Y ternal combustion engine for the purpose of metering fuel Y' to the various cylinders thereof, then of course the disthe Vcylinders of the internal Since the metering Vpurpose -for'the pump requires acu curacy, fluid escaping past the pistonr54 may be'rremoved f Vso as to prevent equal stoke disturbing flow thereof into the housing 12, there is provided :for each of the pump units `Y40 -a drainY line 120.` The drain line 120 is connected to the housing half 16 and communicated with aY Vdrain passage 122 which opens into the hore'52 as seen in FIGURE' 1 and groove 62. Y t. Removably carried 'by the housing half 16 is a lever thus receives fluid from the collector 'Y support 124 byk means of which equalization of the pump stokes is assured. The lever support 124 includes a shaft portion 126 which is seated inthe housing half 16. The

Y levers '132.

Carried 'by the drive shaft1t48 within the housing half 14 is a drive cam which is referred to in general by the reference numeral 156. The drive cam 156 is generally cup-shaped in outline and includes an end wall 158 and a body portion 168y having a cylindrical outer surface 162. The drive cam 156 is of the internal type andY includes an internal cam surface 164. The cam surface. 164 slopes to the right and` towards the drive shaft 148, as is best shown in FIGURE 1.r v

The end wall 158 has formed integral therewith a hub 166. The Ihub 166 is received on the drive'shaft 164 and is keyed thereto by means of a fkey 168.V The't between the hub 166 and the drive shaft 148 is such that while there is no play between the drive cam 1'56` and the drive shaft 148, the cam 156 may be slid longitudinally of the drive shaft 148 a substantial distance in'view of the axial elongation of the stroke adjustment chamber as compared to the pumpchamber in order to' effect a ne stoke variation. Y

The hub I166 is provided with a collar 170 which is spaced longitudinally from the end wall 158. Engaged over the hub 166 intermediate the end wall 158 and the collar 170 is a yoke 172 'which terminates at the inner ends thereof in rollers 174; Y Y` The housing half 14 is provided -With a projecting portion 175 in which there is VformedV a longitudinal slot 176. The yoke 172 includes a lever portion 178 which passes through the slot 176 and which is mounted for pivotal movement Von a pivot pin '18,0' carried by the housing hallf 14 at the vslot 176. The lever 178v is provided in the outer 'end thereof with anY opening 182 through which a suitable fastener (not shown)` may pass 'for the purpose of connecting a control to the lever 17S.

r[the individual levers 13-2 are provided with -a second end 184 spaced a greaterV distance `from pivot 140 than end 134 to more finely vary the pump stroke than the displacement variation resulting from axial shifting of the cam '160 Ywhich Vis'bifurcated andain which there is carried a transversely extending roller 186. The rollers 186engage the cam surface 1647.V The rollers 186 are held in vengagen'lent with theV cam surface 164 by means of springs 188 which extend between the lever support 124 and the levers 132.

It is to be understood t-hat a suitable mounting for the pump will rbe provided. However, inasmuch as the mounting does not play an important part of this invention, the details thereof are not set forth.

In the operation of the pump 10, the shaft 148 is rotated. As the shaft 148 rotates, the drive cam 156 rotates. Because of the shape of the c-am surface 164, as the drive cam 156 is rotated, the levers 132 are rocked about their pivot pins 146. 'Ihe rocking movement of the levers 132 effects the reciprocation of the pistons 54 within the cylinders 42. Incidentally, the axes of reciprocation of the pistons 54 are disposed normal to and intersect the longitudinal axis of the housing 12. The effective su'oke of the pistons 54 is controlled by shifting the drive cam 56 longitudinally of the drive shaft 148. Because of the tapered configuration of the cam surface 164, when the rollers 186 engage the left end of the cam surface 164, asis viewed in FIGURE 1, the effective stroke of the pistons 54 is the minimum. However, when the cam 156 -is shifted to the left, and the rollers 186 engage the right portion of the cam surface 164, the stroke of the pistons 54 is a maximum and the volume of liquid pumped is Aalso the maximum. Thus by controlling the position of the drive cam 156, the output of the individual pump units 40 may be controlled. In View of this, the uid pump 10 is a metering type pump. Also, because of the simplicity of construction of the pump, it will be readily apparent that the pump may be so manufactured whereby it is economically feasible. Further, the design of the pump is such that the pump may incorporate the desired number of pump units with a minimum of change in construction or design.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed as new is as follows:

one end of the casing means to vary the displacement stroke of the lever means and piston means, and biasing means mounted within each cylinder means for acting on the piston means for holding said piston means in contact with the lever means.

2. The combination of claim 1 wherein said axial support means comprises a shaft portion defining a radially inner limit for the contact arm portions of the lever means independent of the cam means and a ange portion disposed on one axial side of the housing means for pivotally mounting the lever means, and axial socket bearing means disposed in said iiange portion for rotatably receiving an inner end of the drive shaft means for journaling thereof.

3. The combination of claim 2, wherein said lever means comprises a plurality of lever members pivotally mounted by the axial support means substantially in alignment With the connection betweenl the housing means and casing means, each lever member having a contact arm portion and a cam follower portion extending in anaxial direction `and being longer than the contact arm portion to provide a fine variation in pump stroke in response l to slidable adjustment of the cam means.

1. A multiple fluid metering pump assembly compris* Y ing, radial pump housing means, axially elongated pump drive casing means removably connected to one axial side of the housing means in axial alignment therewith, axial support means xedly mounted in the housing means `and projecting into the casing means, elongated lever means pivotally mounted by the axial support means between the housing means and casing means, drive shaft means rotatably journaled by one end of the casing means and the axial support means in coaxial relation thereto, elongated variable cam means having an internal cam surface slidably mounted on the drive shaft means and rotatable therewith, in axial spaced relation to the radial pump housing means, a plurality of radially arranged reciprocating piston and cylinder pump means removably disposed in the housing means and engageable by contact arm portions of the lever means projecting into the housing means, said lever means also having cam follower portions projecting into the casing means for sequential displacement by the internal cam surface of the cam means in response to rotation of the drive shaftv means, control means mounted on the casing means and operatively connected to the cam means for axial adjustment thereof between said axial support means and said 4. The combination of claim 1, wherein said lever means comprises a plurality of lever members pivotally mounted by the axial support means substantially in alignment with the connection between the housing means and casing means, each lever member having a contact arm portion and a cam follower portion extending in an axial direction and being longer than the contact arm portion to provide a finer variation in pump stroke in response to slidable adjustment of the cam means.

5. The combination of claim 1, wherein said housing means and casing means form a continuons axial chamber, a plurality of radial bores formed in said housing means in communication with said axial chamber forV removably receiving the clyinder and piston pump means, spaced sealing means mounted in the radial bores and cooperating with the cylinder means to maintain the axial chamber in uid tight relation to the radial bores, and drain means mounted in the housing in communication with the radial bores between said spaced sealing means for removal of leakage fluid from the cylinder means.

6. The combination of claim 5 wherein said axial sup port means comprises a shaft portion defining a radiallyY inner limit for the contact arm portions of the lever means independent of the cam means Iand a flange portion disposed on one axial side of the housing means for pivotally mounting the lever means, and axial socket bearing means disposed in said flange portion for rotatably receiving an inner end of the drive shaft means for journaling thereof.

References Cited in the tile of this patent UNITED STATES PATENTS 672,477 Frith et al. Apr. 23, 1901 2,071,800 Mock Feb. 23, 1937 2,548,501 Simpson et al Apr. 10, 1951 2,553,063 Simpson et al. May 15, 1951 2,657,634 Greenland et al. Nov. 3, 1953 FOREIGN PATENTS 26,943 Sweden May 29, 1909 168,638 Great Britain Aug. 25, 1921 358,376 Francey Dec. l5, 1905 496,546 France Aug. 6, 1919 547,531 Italy Sept. 3, 1956

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