US2628567A - Reversible variable capacity fluid pump - Google Patents

Description

Feb. 17, 1953 w. H. DE LANCEY ErAL 2,628,567

REVERSIBLE VARIABLE CAPACITY FLUID PUMP Filed Dec. 12, 1946 2 Sl-lEETS-Sl-IEET 1 .59 6Z v \Y bk 60 1 IN H Mrrm Hazing .l'dm'r: E W

17, 1953 w. HIDE LANCEY ETAL. 7

REVERSIBLE VARIABLE CAPACITY FLUID PUMP Filed Dec. 12, 1946 Patented Feb. 17, 1953 2,628,567 REVERSIBLE VARIABLE CAPACITY FLUID PUMP Warren -H. De Laneey and Edwin E. Vincent,

Springfield, Mass assignors,

by-mesne a'ssignmerits, to Houdaille-Hershcy CorporatioznDetroit', Mich.,.a corporation of-Michigan l Application December 12, 1946, Serial No.'715, 84 4 "13 Claims. (Cl. 103-120) This invention relates to a variable capacity fluid pump of the vane type, and more particularly to that'type of variable capacity pump in which the displacement automatically adjusts itself to compensate for variations in the driving speed or output requirements-the displacement being modulated from maximum to zeroby comparatively slight increases of pressure after reaching a predetermined point. That is, the volume of the pumps output decreases as the delivery pressure increases, so that the pump is not required to operate under any appreciable back pressure in periods of zero output requirements.

A primary object of the present invention is to provide such a variable capacity pump with component parts such that the' direction of the pump rotor may be reversed by merely altering the relative positions of these parts thereby to permit the pump to be operated efficiently in either a clockwise or a counterclockwise direction depending upon the disposition of these component parts.

Another object of the presentinvention is to provide such a variable capacity pump with means whereby the fluid pressure produced by the pump maybe varied.

A further object of this invention is to simplify the construction of pumps having the above noted capabilities to the'end that they maybe manufactured at a minimum expense.

With the above and other objects in view as will hereinafter-appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

In the accompanying drawings:

Fig. 1 represents a sectional view of a piunp incorporating the present invention, the section being taken transversely of the rotor shaft.

Fig. 2 represents a sectional view taken substantially along line 1-2 of Fig. 1.

Fig. 3 represents. a front view, in reduced scale, of the device as disclosed in Fig. 1 with the component parts thereof so assembled as to enable the rotor shaft to rotate in a counterclockwise direction.

Fig. 4 represents a front view, in reduced scale, of the present device as disclosed in Fig. 1 with the component parts thereof assembled in a manner suchas to enable the rotor shaft thereof to rotate in a clockwise direction.

Fig. 5 represents a face view of aport-containing disk.

:Fig. 6 represents a sectional view of theele- 2 ment disclosed in "Fig. S5 and taken substantially along the line 6-6 of Fig.5.

Fig. 7 illustrates "the real-end viewof "theelement disclosed in Fig. "5.

Fig. 8 represents a sectional view of the element disclosed inFig. "7 jand'taken substantially along "the line 8-'80f Fig. '7.

Like reference characters refer to like parts in the differentfigures.

Referring particularly to Figs. :1 and 2, the presentinvention is'inco'rporatedin a pumping unit which comprisesaghousing element III of, a generally annular form and "having an end plate ll secured overoneend thereof'by means of a plurality of suitable bolts l2 which pass through holes 13, provided in the end plate ll thus to bethreaded directly: into the housing Ill. The housing Ill is formed-with'a'central'bore 14 opening directly into a substantially cylindrical chamber 15 whichis closed over byjmeans of the end plate II.

Rotatably journaled within the bore 14 'is a rotor shaft 16 which may be driven in "any suitable manner, asbymeans of a driving gear, not shown herein, which'may'imesh with a .gear l1 keyed or otherwise suitablysecured upon the distal end of the rotor shaft '15. The shaft .IB passes through the'chamberliand carries within'this chamber a pump rotor .l'8,the latter having an inner hub portion "which surroundssaid shaft and is keyedthereto' as shownat 20. The pump rotor is formed in the usual manner with a series of radial slots 2!, in each of which is disposed a radial slidable vane 22. The outer ends of said vanes'are adapted, according to this invention. to work against the interior'periphery of a ring-like modulato'r'member '23 which surrounds the rotor ill in the pumpspace provided by the cylindrical chamber 15 of the housing I'D, said member 23 as well as the-several vanes 22 extending across said space from side to side, between opposed inner faces 25 and 26 'of the housing I 0 and a port-containing member "27 which will be hereinafter described.

Thering-like member on its outer periphery is appreciably smaller in diameter than the chamber of bore .l5,.and on its inner periphery is appreciably larger in 'diameterthan the pump rotor I 8, in consequence *ofthisthere is ample opportunity in the'pump space surrounding the rotor l8 for'free movement of said member 2 3, into positions of varying eccentricity relative to the rotor l8, to vary thepumping action 'ofthe latters slidable vanes 22,:22.

A simple and'highly advantageous mounting of member. 23,.for purposes of such eccentricitymovements isobtained by providing on-theoutside surface of said member 23,.andpreferab1y across its entire width a rib 28 of substantially triangular ,cross .1 section; and with side surfaces at an acute angle to each other so as to form at their intersection a virtual knife edge, as indicated at 29. For the reception of the rib 28 the surface of bore 15, as shown in Fig. 2, is provided with a two-side indentation or cleft 38, somewhat shallower than the rib 28 and with its intersecting sides at an appreciably larger angle to each other than the intersecting sides of said rib, thus to give ample clearance for free and frictionless rocking movements of the ring 23 on the axis afforded by the bottoming of the rib edge '29 in the angular indentation 30. A similar indentation or cleft 3| is formed in the bore I5 at a point diametrically opposite the indentation 38. By providing this second indentation- 3| the ring 23 may be assembled into the pumping unit in either of two positions thereby to permit, as hereinafter described, the shaft It to be rotated in either a clockwise or a counterclockwise direction. Provided on the outside periphery of the modulator ring 23, at a point diametrically opposite the rib 29, is an arcuate boss 32 which is adapted to engage the inner periphery of the bore I5 for the purpose of maintaining the rib 28 within its proper indentation, whether it be indentation 30 or 3!.

The ring 23 presents a continuous unbroken interior cylindrical surface to the ends of the vanes 22, 22 there being no .need to provide said ring with fluid openings to the spaces between the vanes since the ingress of fluid to and its exit from said spaces is obtained laterally by way of passages leading into the pumping spaces through the port-containing member 21.

Referring particularly to Figs. 1, 5, 6, '1, and 8, the forward end of the shaft 16 projects into a bore 33 provided axially of the port-containing member 21 which is snugly positioned within a cylindrical recess 34 provided within the inner face of the end plate ll. Asherein shown, the member 21 provides a fluid intake passage 35 and a fluid delivery or offtake passage 36. Both of these passages 35 and 38 communicate with the opposite face of the member 21 by means of conduits 31 and 38 respectively. Formed on the inner face 26 of the member 21 are arcuately shaped fluid-conducting passages 39 and 40 which communicate respectively with the conduits 31 and 38. As shown in Figs. 3 and 4, the elongated passageway 39 is disposed'in the fluid intake zone and the elongated passage 40 is disposed in the fluid delivery zone of the path of travel of the vanes 22, .22. The function of these grooves is principally to insure an unrestricted internal flow of fluid as drawn into and expelled from the spaces between the vanes 22, 22 by the rotation of the rotor 18 within the ring 23 in the directions of the arrows 4| and 42 associated with the Figs. 3 and 4 respectively.

The intake groove is preferably made wide enough to overlap the ring 23 on both sides, thereby to give the enteringfluid access to the space between said ring and the bore 15, and to reduce the fluids tendency to become aerated by reason of undue restriction of its flow. Furthermore, this-construction will permit the delivery of a small portion of the fluid to a conduit 43 disposed within thehousing ID for the purpose of providing a means whereby fluid may be delivered from the chamber l5 to the outer periphery of the shaft I'Bthereby to lubricate the latter element. This conduit also functions to prevent the pumping elements from forcing fluid from the chamber l5 out of the casing [0 along the shaft [6.

As best shown in Fig. 1, the rotors inner hub portion I9 is of less width, axially of-the shaft [6, than the vanes 22, 22, this reduction of the width resulting from the rotors opposite faces being formed with circular recesses 44 and 45. Since these recesses 44 and 45 are intersected by the inner ends of the radial slots 2|, 2!, it follows that the end extremities of the inner edges of the several vanes 22, 22 are located in these face recesses 44 and 45 of the rotor I8. Also located in such recesses 44 and 45 are loose rings 46 and 41, respectively, each encircling the shaft I6 and having an external diameter that gives it virtual peripheral contact with the inner edge portion of each of the several vanes 22, 22 of the rotor. Each of the rings 46 and 41, by its ability to move about freely in its associated recess, serves as a shiftable backing for the vanes 22, 22, the said rings 46 and 41 changing their positions in the respective recesses as the eccentricity between the rotor l8 and the surrounding ring 23 is increased or decreased, as the case may be, and in the operation of the pump. Whatever the pumping position may be, said rings 48 and 41 maintain their peripheral contact with the inner edges of the vanes 22, 22 and thus insure the vanes contact by the outer edges with the inner periphery of the modulating ring 23.

In Fig. 2 the ring '23 is shown in its position of maximum eccentricity, relative to the rotor l8, its movement to this position (of maximum pumping action by the vanes 22, 22) being obtained by the thrust thereupon of a suitable spring 48 disposed within an opening or socket 50 provided in the peripheral wall of the bore 15. One end of this spring engages the deepest or base portion of the opening or socket 59 and the other end of the spring is seated within a recess 5| provided in the peripheral portion of the ring 23 opposite the socket 50. The pressure of the spring 48 against the ring 23 biases the ring about its pivot rib 28 to the end that the lower portion of the ring (as depicted in Fig. 2) will normally approach contacting relation with the lower portion of the bore [5. It is to be understood that the spring 48 virtually floats between the ring 23 and the base portion of the opening 58 thereby to provide a movable direction of spring thrust. Should the ring 28, with its pump inactive or at rest, be in any way displaced under pressure from the spring 48, from the position of Fig. 2, so as not to sit perfectly on its edge 29 in its angular indentation 38, it is evident that upon starting up of the rotor's rotation in the direction of the arrow 42, the ring 23 will be immediately and automatically moved to correct seating position due to the pressure of fluid against the interior surface of the ring in the zone of said seating, which causes the edge 29 to bottom in the indentation 30. If fluid in excess of output requirements is being delivered to the pump, the resulting increase of fluid pressure in the wedge shaped zone 49 between rotor and modulator ring becomes immediately effective against the rings surface in said zone to move said ring, against the pressure of the spring 48, towards a less eccentric position relative to rotor l8 which automatically reduces the pumping action of the vanes 22, 22

' to a point in keeping with the output requirements. Thus, under all conditions, the pump will automatically adjust itself to deliver fluid under pressure only in the amounts required by the device or devices which it is supplying.

Referring particularly to Figs. 1, 2, 3, and 4,

"the-hub portion 5| of the-port-containing member 21 is received within :an axial bore 52pm.- .vided in the end cap H. The one end of the shaft l6 projects forwardly of the member "27 and into the bore 52 for the purpose of providing a means upon which an'o'il seal 53 may be placed within the-end cap ll thereby to prevent the egress of fluid along the shaft "l6 and out through the axialopening of the-end cap H. A similar oil-seal 53"is"provided about the other end of'the shaft l6 and within an'ap'erture '54 provided in the rear wall ofthe housing in. This oil seal 53 will prevent the egress of oilalong the shaft and out'through'the rear end portionof the housing l0.

Provided-in the peripheral portion-of the housing I0 is a pair of spaced apertures 55 and 55 which communicate respectively witha pair of longitudinally disposed passageways Hand '58 which are formed in' the'housing Hl'thus to communicate with'the end" cap H. Referring particularly to Figs. 1, 3, and-4, the end cap I l is provided with raised portions 59 and 66 which contain'passageways 6! and '62 respectively. When the end cap II is placed'in its proper position over the housing It the passageways 6| and 62 are disposed in register over the passageways 51 and 58, respectively, for the'purpose of placing these latter passageways in communication with the passageways '36 and 35 respectively of the port-containing member 21. Referring particularly to Fig. 4, it is to be understood that the passageway 58 is adapted to-deliver oil tothe intake or low pressureside of the rotor through the passageway Brand the oil passageway 35 the latter of which isformed in the port-containing member 2'1. It isa'lso to be-understood thatthe oil which is forced under pressurethrough'the outlet passageway 36 of the member 2! will find its way out of the housing 10 by way-of-the passageway GI and the passageways 5 and 55.

In the event that it is desired-to rotate the shaft I6 in the direction of the arrow ll as disclosed in Fig. 3, it is merely necessary in the present device to reverse the position of'the ring 23 as shown in Figp2so that the-rib member 28 will be positioned within-the-cleft 3l rather than within the cleft 30. This will, of course, not affect the eificiency of the pumping unit as it will merely permit the ring 23 to .function within the cleft 3| in exactly'the same manner as it functioned within the cleft '30. When this change is made, however, some provision must be made whereby the inletandoutlet ports may be shifted so'that they 'mayproperly conduct oil to and from the pumping'unit. In orderto accomplish this objective, the present port-containing member 2'! has been so designed'that it may be shifted from the position shown in Fig, 4 to the position shown in Fig. 3. This change involves merely turning the member '21 within the bore 34 of the end plate I I until, it is disposed in the position as disclosed in Fig. 3. It is to be understood that when the member 21 is so shifted there is a complete reversal of the functions of the oil intake and'outtake passages which are provided within the housing H). In other words, whenever the plate 21 is so shifted the intake aperture 31 provided in the member 21 is moved from register with the passageway 62 ofthe end plate H into register with the passageway 6| of the end plate, and by the same token the outlet passage 38 is shifted from register with' passageway 61' of the end plate ll into register with the'passageway 62'of theen'd plate." There- 6 fore, to reverse the present sum-ping iuiit come pletely one need only *shift 'the nembr '21 "as 'hereinabove described, -'-'reverse the position of the ring 23, and switch @thefiu'id intake and inlet lilies-which would hermally be attached to the bores "55 and 5'5 of-thehous'ing l-D.

As shown particularly 'ih Fig. '1, "the members 21 and 'll are provided with dowel pin apertures 63 and54, respectively, "for the purpose of receiving a 'clowel pin 65 which'functions to place the member 21 in its proper position relativeto the rotor. As maybenot'ed "in 'Fig. '7, the member 2'1 is provided' with' a second dowel pin hole 66 which may 'be utilized whenever the member-21 is-shiftedintothe position as in- (heated in Fig. f3 thereby {to 'pern'iit the dowel pin 65to align the dowel "pin hole 66 with the dowel-pin hole 63 of the-member -I I. From this it will be understood-that the member 21 may be accurately positioned-within'the end cap II for either "clockwise or counterclockwise rotation of theshaft l6.

Referring p'articularlyto Figs? and 4, it is to be understood that as the port-containing memher 21 is shifted s'lidingly in a -'counterclockwise direction about theshaft IGthearea ofapplied thrust outwardly against the ring 23 will shift from zone 49*"to "a "point-,"closer to the rib 28. By so-shifting the direction-of thrustthe oil will be required to -produce a=greater force upon the ring 23 in orderto shift'the'sameto its position of minimum eccentricity. "By the same token, it isto be understood that if the'memher were to be shiftedin a clockwise-direction, as vieweclin Fig. 4, 'the'oil wouldfbe required to produce a lesser force-upon the ring 23 in order to shift the same to its position of minimumeccentricity. Thisisfor the reason-that theeifective-lever distance' from thespring 48*to the fulcrum point 29 ofthe ring23 remains substantially constant while the effective lever distance from the area of applied thrust-against the ring to the fulcrum point 29 is decreased or increased, depending upon whether *the member 21 is rotated in a counterclockwise 'or a clockwise direction From theabove it is to be'und'erstood that by so shifting the member'il-ab'out the shaft IS the effective-pressure of the oil iiowing out of the pump casing will be increased as the member is turn'ed'ina counterclockwisedirection and will be-decreasedasit is turned in a clockwise direction. However, when the member 2! is positioned within the pumpunit as illustrated in Fig. 3, it must be adjusted in a manner just opposite to that as above described in order to effect the same results. But inorder to so alter the positionof the'memberl"! some'adjusting' means required. The present invention contemplates the provision of such means.

'It'willbe-understood that whenever it is desired *toincor'porate the hereiuabove noted adjusting means within the present. oil pump, the dowel pin 55 must be omitted'from the assembly. In lieu of this dowel'pin'there is provided a worm gear 61 which isjournaled withi'n'the end plate H. The inner end of the worm gear 61' may be formed with a bearing member 68 ad'apted to be received within a cylindricalseat 69 formed in the bottom portion ofa bore 10 which is adapted to receive'thelarge cylindflcaiehdpoition H of the worm 61. The outerend of the member H projects out ofthebore 10 and has formed thereon a; head member "TI-the function of which. is to provide meahswheiebfth wornrmalf'brotated.

A screw 13 is threaded into the plate II for the purpose of projecting into an annular groove 13' formed about the member I I Thus, the worm is prevented from shifting lengthwise of itself. A set screw 14, also threaded into the plate II, is adapted to engage the member H thereby to lock the same in any desired position.

The worm 61 is adapted to mesh with gear teeth 15 provided on the outer periphery of the member 21. Referring particularly to Fig. '1, it will be seen that the teeth 15 are disposed about the peripheral portions of the member 21 for the purpose of providing means whereby the member 2'! maybe rotatably adjusted whether it be in the position disclosed in Fig. 3 or in Fig. 4. From this it is to be understood that the rotation of the worm 61 will be effective to rotate the member 21 within the bore 34 of the end plate to the end that the pressure of the oil flowing from the pump may be varied. It will occur to those skilled in the art that other means could be provided for adjusting the member 21 about the shaft ii. For example, link and crank elements could be substituted in lieu of the worm and wheel expedient herein used. However, such modifications all come within the scope of the present invention.

From the above it is to be understood that the present invention provides a novel and extremely efficient pump which is adapted to be assembled in two different ways thereby to produce a pump which will rotate in either of two directions.

Furthermore, this pump is so constructed that by a very simple manipulation the unit may be effective to produce various pressures upon the oil which is forced therethrough.

We claim:

1. In a variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a rotor having radially slidable vanes and rotatable in said chamber, a ring-like member pivotally mounted at one side thereof within said chamber and disposed so as to surround said rotor and cooperating by its inner surface with said vanes to produce the pumping action, yieldable means biasing said member about its pivotal mounting to eccentric position relative to said rotor for maximum pumping action by said vanes, said intake and delivery connections being so disposed I relative to said ring-like member as to cooperate with said rotor in producing a pumping pressure acting on an inner surface area of said ringlike member between said pivotal mounting and said biasing means, in a direction to move said ring in opposition to said biasing means toward concentric or non-pumping position to minimize the pumping action, means adjustable to alter the position on said inner surface of said ringlike member at which said pumping pressure is applied, and means extending out of said housing for effecting the adjustment of said last named means.

2. In a reversible variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a rotor having radially slidable vanes and rotatable in said chamber, a ring-like member pivotally mounted at one side thereof within said chamber and disposed so as to surround said rotor and cooperating by its inner surface with said vanes to produce the pumping action, yieldable means biasing said member about its pivotal mounting to eccentric position relative to said rotor for maximum pumping action by said vanes, said biasing means thrusting said member to move pivotally in the same general direction as the direction of rotation of said rotor and in opposition to a tendency of the member to pivot in the opposite direction responsive to pumping pressure acting on an inner surface area of said member between said pivotal mounting and said biasing means for modulating the pumping pressure, means provided in said housing so that the relative positions of said pivotal mounting and said biasing means may be reversed whenever the direction of rotation of said rotor is to be reversed thereby to permit said biasing means to urge said member about its pivotal mounting in the same general direction as the direction of rotor rotation in either of said positions of the pivotal mounting, means adjustably disposed within said housing and having spaced intake and delivery ports therein connecting said intake and delivery connections with said chamber, and means for adjusting said last named means within said housing so that a portion of its delivery port may be selectively positioned at various locations between said biasing means and said pivotal mounting in either of said positions of the pivotal mounting of the member.

3. In a reversible variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a moduiator ring, said housing and said modulator ring having means cooperating to define a pair of spaced selectively usable fulcrum points with respect to which the modulator ring is adapted to be rockably mounted in said chamber to rock about either selective one of said pair of spaced fulcrum points, a rotor having radially slidable vanes and being rotatable in said ring in either direction so as to produce the pumping action by cooperation of said vanes with the interior surface of said ring, means movably disposed within said housing and having spaced intake and delivery ports therein connecting said intake and delivery connections with said chamber, means for maintaining said last mentioned means in a selective one of two positions to which it may be moved within said housing depending upon about which of the selective fulcrum points the modulator ring is rockable, a portion of said ring's interior surface in the zone of said delivery port being acted on by the pumping pressure in a direction tending to shift said ring toward a position concentric with said rotor to thereby minimize the pumping pressure, and spring means acting on said ring in opposition to the pumping pressure and tending to rock said ring to a position eccentric to said rotor for increasing the pumping pressure.

4. In a variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a pair of fulcrum means disposed substantially at diametrically opposed points relative to each other at the inner peripheral portion of said chamber, a ring-like member having a pivotal element formed on the periphery thereof, said ring-like member being assembled into said chamber with its pivotal element in engagement with a selective one 'or" said fulcrum means, a rotor having radially slidable vanes and the rotor being selectively reversely rotatable in said ring-like member so that in either direction of rotation said vanes will produce the pumping action, and spring means disposed substantially degrees out of phase with each of said fulcrum means for urging said ring-like member into eccentric position relative to said rotor'f -or gagement of the pivotal element with either selective one of said fulcrum means conformable to the direction of rotation of said rotor to thereby enable the ring-like member to rock about either fulcrum in the general respective direction of rotation of the rotor.

5. ma variable delivery fluid pump, a housing providing a chamber and having fluid intake and delivery passages, a modulator movably mounted in said chamber and having'a circular pump chamber therein, a selectively reversibly rotatable rotor having pumping means engaging the wall defining saidpumping chamber within the modulator to effect fluid displace ment upon rotation of the rotor, the modulator being movable in saidhousing chamber to vary the relationship of the pumping chamber wall cccentrically with respect to the'roto'r for"va1i able fluid displacement by the pumping means, a member assembled within said housing between the modulator and rotor and saidfluid intake and delivery passages and having spaced intake and delivery ports therein for connecting said intake and delivery passages with said pump chamher, said member being movable within'the hous ing and relative to said rotor for adjusting the relative positions of said intake and delivery ports to accommodate the respective reverse pumping "rotations of the rotor, and an element having engagement with the housing and with said memher for retaining'the latter in any position to which "said member may be moved within the housing for proper relationship of the intake and delivery ports with respect to the direction of rotation of the rotor.

6. A pump construction as defined in claim 5 wherein said element comprises a dowel and the housing and said member have respective dowel sockets for inter-engagement therein of the dowel.

'7. A pump construction as defined in claim 5 wherein said elementcomprises a manually operable screwhaving a manipulating portion externally of the housing.

' 8. In a reversible variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a ring-like modulator member pivotally mounted at one side thereof Within said chamber, a rotor having radially slidable vanes and rotatable within said ringlike member to produce the pumping action, means biasing said member about its pivotal mounting to eccentric position relative to said rotor for maximum pumping action'by said vanes, the thrust of said biasing means on said member being in the same general direction'as the direction of rotation of said rotor, said biasing means being yieldable to enable pivoting of said member in opposition to said thrust for varying the pump capacity responsive to pumping pressure acting on an inner surface of said member between said pivotal mounting and said biasing means, means provided in said housing so that the relative positions of said pivotal mounting and said biasing means may be reversed whenever the direction of rotation of said rotor is to be reversed thereby to permit said biasing means to urge said member about its pivotal mounting in the same general direction as" the reversed direction of rotor roanoameans' disposed within said housing for movement within and relative to the housing and having spaced intake and delivery ports therein connecting said intake and s ctiv'e fulcrum means" enabling reversal of the ring-like member for'erv' portion of said modulator 'memberfor'se delivery connections with said chamber, and

means for securing said last 'namedme'aris' in a selective one of 'twopositions to 'wh'ich it is moved within said housing so thatat'least a portion of its delivery port may be positioned substantially between said" biasing mea11s""and the "pivotal mounting in either of said pivotal""mounting positions of said member to accommodate said reversals of rotation'of the rotor.

91111 a reversible variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and deliveryconnections; a "pair" of fulcrum means disposed substantially at diametrically opposed points relative" to eachbther' at theinner peripheralportion of saidchambe'r, a ring-like modulator" member movablymounted' in said chamber, a rotor or smaller diameter than the" inner diameter'of said modulator member and rotatable within themodulator 'm'ember'an'd having" radially movable "elements cooperating with'the modulator member to produce a pu p: in'g action'upon rotation of the rotor in'th moa lator member, means'dis'p'o'sed' upon the outer portiorr' of said modulator member *for selected engagemenhwith one or 'said pair of fulcrum means to thereby provide with" either of said fulcrum'means' a pivotal mounting" for said'modu lator member for varying pump displaement'by swiii'ging of the modulatonmember about the selected'pivot, means disposed substantially degrees out of phase "with each of "Said fulcrum means for urgin said modulator member 'to' swing about the' selected one of said'fulc'rum means into an "eccentric position relative to said rotor "for maximum pumping action by said a: dially movable elements, and "means movably disposed within said housingfor 'efiecting operative connection between said intake and delivery conmotions in either of the selective pivotal mount ings of the modulator member; said movably disposed means having intake and delivery ports connected with"'said'intake and delivery connec tions'and being adapted to be selectively moved and position'ed'within said housing complemenf tary to the respective pivotal mountings of the modulator member tocontrol the application of pumping pressure'to an' inner surfac area of said modulator memberloc'ated between the selected'one of said fulcrum'means engaged by said means on the outer portion of the" fulcrum member and said biasing means for moving the modulator member towards concentric or non pumping position'r'elative to the rotor and in opposition to said biasing means for reducing the pumping'action of sai'delements.

' 10'. In a reversible'variabledelivery fluid pump, an'oute'r housing'providing ahollow chamber and fluid intake and delivery connections, a pairof fulcrum means disposed substantially at diametrically opposed points relative to eachother at the inner peripheral portion of said chamber, a ring-like modulator member movably mounted in'said chambena rotor of smaller diameter than the" inner diameter of said'modulator member and rotatable'within 'themodulator member and having radially movable elements cooperating with" the modulator member'to produce'a pumping 'action'upon rotation of the rotor in the modulator member, means'disposedupon the outer ted ng e e w th "one f sa d a rflo rul r mesns m therebyprdvide with either-bf sa'i'diulcrummeans a pivotal mounting for said modulator member for varying pump displacement by swinging of the modulator member about the selected pivot, means disposed substantially 90 degrees out of phase with each of said fulcrum means for urging said modulator member to swin about the selected one of said fulcrum means into an eccentric position relative to said rotor for maximum pumping action by said radially movable elements, means movably disposed within said housing for effecting operative connection between said intake and delivery connections in either of the selective pivotal mountings of the modulator member, said movably disposed means having spaced intake and delivery ports therein for connecting said intake and delivery connections with the interior of the modu lator member, and means for securing said movably disposed means in a selective one of two positions into which it may be moved within said housing so that at least a portion of its delivery port may be positioned substantially between said biasing means and the selected fulcrum means that is engaged selectively by said means disposed on the outer portion of the modulator member and the inner peripheral wall of the modulator member thereby subjected to pump pressure in opposition to said biasing means for automatically varying the pump pressure responsive to increase of pump pressure beyond a predetermined value.

11. In a reversible variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a pair of fulcrum means disposed substantially at diametrically opposed points relative to each other within said chamber, a ring-like modulator member movably mounted in said chamber, a rotor of smaller diameter than the inner diameter of said modulator member and rotatable within the modulator member and having radially movable elements cooperatin with the inner peripheral wall defining the modulator member to produce a pumping action upon rotation of the rotor in the modulator member, means disposed upon the outer portion of said modulator member for selected engagement with one of said pair of fulcrum means to thereby provide with either of said fulcrum means a pivotal mounting for said modulator member for varying pump displacement by swinging of the modulator member about the selected pivot, means disposed substantially 90 degrees out of phase with each of said fulcrum means for urging said modulator member to swing about the selected one of said fulcrum means into an eccentric position relative to said rotor for maximum pumping action by said radially movable elements, and means movably disposed within said housing for effectiv operative connection between said intake and delivery connection in either of the selective pivotal mountings of the modulator member, said movably disposed means having two different selective positions of assembly within the housing correspondin generally to the respective reverse mountin positions of the modulator member so that in either of said reverse mounting positions of the modulator member at least a portion of the delivery port of said movably disposed means will be positioned substantially between said biasing means and the respective engaged fulcrum means.

12. In a variable delivery fluid pump, an outer housing providing a hollow chamber and fiuid intake and delivery connections, a ring-like modulator member within said chamber and having pivotal connections at one side of the member for rocking thereof within the chamber, a rotor rotatable on a fixed axis and disposed within said modulator member and having radially movable elements cooperating with the inner surface of the modulator member to produce a pumping action, means biasing said modulator member about its pivotal mounting to eccentric position relative to said rotor for attaining maximum pumping action by said elements, said biasing means being yieldable responsive to internal pumping pressure within the modulator member to permit movement of the modulator member to positions of less eccentricity with respect to the rotor in order to vary the pump displacement, and means for connecting said fluid intake and delivery connections with the interior of the modulator member, said last mentioned means being adjustable relative to the modulator member to alter the effective fluid pressure upon the modulator ring to shift it in opposition to said biasing means during rotation of the rotor.

13. In a variable delivery fluid pump, an outer housing providing a hollow chamber and fluid intake and delivery connections, a ring-like modulator member within said chamber and having pivotal connections at one side of the member for rocking thereof within the chamber, a rotor rotatable on a fixed axis and disposed within said modulator member and having radially movable elements cooperating with the inner surface of the modulator member to produce a pumping action, means biasing said modulator member about its pivotal mounting to eccentric position relative to said rotor for attaining maximum pumping action by said elements, said biasing means being yieldable responsive to internal pumping pressure within the modulator member to permit movement of the modulator member to positions of less eccentricity with respect to the rotor in order to vary the pump displacement, means for connecting said fluid intake and delivery connections with the interior of the modulator member, and means for a fiusting and maintaining said last mentioned means relative to said housing in predetermined respective positions of said ports relative to said modulator member.

WARREN H. DE LANCEY. EDWIN E. VINCENT.

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

UNITED STATES PATENTS

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