US 2392279 A
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Description (OCR text may contain errors)
Jan. 1', 1946. R. J. wooDs 2,392,279
. PRESSURED FLUID PUMP.OR MOTOR I Filed Nov. 2, 1944 INVENTOR RoBER'r J. Wqons am,m, cz-mmm Patented Jan. 1, 1946 I siren stares TENT orrlca PRESSURED YLUHP PUMP OR MOTOR Robert J. Woods, Grand Island, N. Y., assignor to Bail Aircraft Corporation, Buffalo, N. Y.
Application November 2, 1e44, Serial No. 561,507
6 Claims. This invention relates to fluid pumps or motors, and more particularly to an improved wobble plate type variable displacement constant pressure pump or motor.
A primary object of the invention is to provide a structurally simplified and improved pump or motor of the type referred to which is relatively inexpensive to manufacture and adapted to be mechanical drive means.
In the drawing: Fig. l is a vertical longitudinal section through a low pressure pulsating flow type pump of the invention;
Fig. 2 is a section, as along line 11-11 of Fig. 1; Fig. 3 is a vertical longitudinal section through a high pressure integrated flow type pump of the invention I and Fig. 4 is a section as along line IV-IV of Fig. 3; I
In Figs. 1 and 2 the invention is illustrated by way of example in a pump comprising a housing It which is formed with a fluid intake'port 52 leading to fluid channels lt-IB. Check valves "-88 are disposed within the fluid channels l5- 6, respectively, and are backed by compression springs 20-21 so as to be adapted toseat against how of fluid in reverse direction or to-l ward the intake port (2. The channels l4-l6 lead into communication with chambers ,2224 respectively; and outlet channels 26-28 lead from the chambers 12-24 to corresponding outof the diaphragm into fluid-tight abutting relation against a central face portion of the pump casing l0. Thus, as shown more clearly i Fig. 2,
the pump diaphragm is provided with a pair of fluid chambers 50-52 at positions above and below the partition wall 46 thereof; and the chambers 5052 are in open communication, respectively, with the chambers 22-24 of the pump casing N.
A wobble plate type unit is operably connected to the end wall 45 of the diaphragm for actuating the latter so as to alternately expand and contract the volumetric capacities of the fluid chambers 5d52 mteriorly of the diaphragm. For this purpose the wobble plate mechanism is illustrated to comprise a frame 55 carrying a dual race bearing 66; the outer race portion of the bearing being fixedly mounted within the frame by means of bolts 44. The diaphragm 40 also ineludes an elastic top cover portion 15, titloning wall 48 is formed integrally cover 58 to extend transversely c1 and a parwith the top the interior and the inner race portion thereof being pivotally mounted as by means of a transverse pin 62 upon the inner end of the pump drive shaft 65. The drive shaft 55 is carried by a bearing 66 to be rotatably mounted upon a housing 10 which encloses the diaphragm 80 and clamps to the casing Ill, as by means of the bolts 44.
Thus, it will be understood that the pin connection between the shaft 85 and the inner race of the bearing will cause the latter to rotate with the drive shaft while the'outer race of the bearing 60 is non-rotativeand fixed to the diaphragm 40. A wobble plate angle adjustment device is illustrated in the drawing to comprise an arm 12, the main body portion of which is slipfltted longitudinally within a bored portion of the drive shaft $5 so as to be guided thereby, while a bent end portion 14 of the arm 12 extends laterally of the drive shaft through a suitable aperture therein and terminates in a bearing ball l5 which is so arranged to press against the inner race of the bearing 60. At its outer end 11 the arm 12 is formed to operatively connect to any suitable manual or automatic adjustment device, whereby it will be understood that the adjustment arm E2 may be displaced at will in directions axially of the drive shaft by simple operations performed externally of the pump and pump drive mechanism.
Inasmuch as the inner bearing race and the angle adjuster arm bearing 15 both rotate with the drive shaft 65, it will be appreciated that whenever the adjuster arm 72 is positioned so as to set the wobble plate at an inclination relative to the drive shaft, for example as viewed in Fig. 1, subsequent rotation of the drive shaft 65 will cause the inner race of the wobble plate to c: a
clically cam the outer rim portion or the diaphragm in such manner that the cells 50-52 inpressed. Cords or coil springs or the like as in-.
dicated at tawill'preferably be embedded in the rubber material so. as to encircle the fluid cells to reinforce the latter against lateral defame-- tions during the pump operation.
Thus, it will be understod that a pump of the character of the pump illustrated in Figs. 1-2 may be provided to be of utmost structural simplicity and to embody a minimum of fluid-sealing relatively moving parts such as' require'high precij sion manufacturing methods andcareful servicing. A pump of this type is adapted to displace fluids at varying rates of displacement, as controlled simply by setting of the position of the adjuster arm 12 from externally of the pump and drive devices; and such adjustments may be made while the pump is operating as well as when it 3 is inoperative. Thus, the rate of displacement of the pump is infinitely variable between zero rate of displacement and the maximum rate of displacement as determined by the dimensioning of the displacement providing elements of the mechanism.
It will be appreciated, however, that the pump of Figs. l-2-will be of the so-called pulsating fiow type because of the opposed settings of the fluid 1 cells interiorly of the diaphragm; and that therefore a pump device of this form is best adapted for service wherever relatively low pressures and pulsating flow performances are satisfactory.
Figs. 3-4 illustrate another form of pump or motor of the invention which is adapted to provide relatively high pressure and integrated type flow performances. In this case the valve casing Hill is formedwith afiuicl inlet port I02 carrying a fluid sealing packing lull through which extends one end of the drive shaft-"I05. A valve plate N38 is carried by the drive shaft 35 and is keyed thereto so as to rotate with the drive shaft. A packing Hi8 fluid-seals the periphery of the valve plate Hit-relative to the casing Hit, and the valve plate m6 is positioned so as to slidingly hear at its inner side face against a stationary valve plate Hll which is clamped to the casing Hill by bolts i I2. The diaphragm i is of the pump of Figs. 3-4 is generally similar to the diaphragm of Figs. 1-2,
I but differs therefrom in that it contains a relatively large number of fluid cells I it (see Fig; 4)
spaced concentrically of the drive shaft axis. The wobble plate and plate angle adjustment devices l2il--i22 respectively, are illustrated to be identical to the corresponding devices of the mechanism illustrated in Figs. 1-2.
The fixed valve plate l is is formed with a plurality of apertures 125 which are disposed inopen communication respectively with corresponding fluid cells H3 in the diaphragm H5. The rotating valve plate 906 is formed with a fluid outlet aperture I26 in the segment of the plate we corresponding to the segment of the diaphragm H5 which is squeezed whenever the wobble plate is set at an inclination by adjustment of the control arm H2; and the valve plate y; it also carries a fluid intake port [28 at a position therein diametrically opposed to the position of the fluid outlet port i28 thereof. fluid inlet port of the valve plate we is in open communication with a channel are disposed interiorly of the valve plate and leading into a centrally bored portion i of the drive shaft 505; the bored portion IBB of the drive shaft being extended to open into the fluidinlet port 5132 of the pump casing.
Thus, it will be of the drive shaft 605 while the wobble plate are is set at an inclination relative to the axis of the drive shaft, the wobble plate will operate to successively compress and squeezethe fluid cells lit of the diaphragm as the depressed segment of the wobble plate cycles around the annulus of fluid cells; and that the fluid outlet aperture lid of the rotating valve plate accompanies this progression of the wobble plate so as to permit the fluid as it is squeezed out of the cells to pass into the interior of the valve casing its for discharge through a port B32 thereof. At the same time the fluid inlet port portion 42s of. the rotating valve plate progresses in parallel with the segment of the wobble plate which is causing successive stretching of the diaphragm cells as the retarded portion of the wobble plate cycles around the annulus of fluid cells.
The mechanism of Figs. 3-4 is suited to function in the manner of a motor as well as a pump, as by response to introduction of pressured fluid through the port 32. In any case it will be appreciated that the mechanism of Figs. 3-4 will be adapted to provide a smoother flow of transmitted power than in the case of Figs. 1-2; but it must also be appreciated that ineither of the examples illustrated the power output will be relatively smooth because the elastic properties of the diaphragm in either case will tend automatically to provide absorption of pressure peaks.
If desired, coil springs or the like may be em H5, as explained in that pump or motor devices of the invention may be constructed more cheaply than similar type pumps or motors of the prior art and will give less service trouble than such prior art types. Although only a limited number of forms of the invention have been shown and described in detail it will be apparent to those skilled in the art that the invention is not so limited that various changes may be made therein without departing from the spirit of the inventionor the scope of the appended claims.
I claim: v
1. A pressured fluid displacement mechanism comprising an elastic body having a fluid cell therein adapted to be dimensionally increased and decreased in one direction upon elastic deformation of said body, a fluid inlet-outlet systent in open communication with said fluid cell,
check valve means associated with said fluid inlet-outlet system for controlling fluid to travel in only one direction therethrough in response to alternate suction andpressure forces therein,
understood that upon rotation a,sca,ave
means operably connected to said elastic body for displacement incidental toelastic deformation of said body to procure alternate expansion and contraction oi said fluid cell, and reinforcing means within said body encircling said cell and flexible in said one direction and substantially rigid against deflections radially thereof,
2. A fluid'pump comprising an elastic body having a fluid cell therein, a fluid inlet-outlet system in open communication vwith said fluid cell, check valve means associated with said fluid means operably connected to said elastic for elastic elongation deformation thereof to proinlet-outlet system for controlling fluid to travel in only one direction therethrough in response'toalternate suction and pressure. forces therein, means operably connected to said elastic body for elastic deformation thereof to produce alterpressure forces therein, and means operably con-- nected to said elastic body for universal bending elastic deformation thereof to produce alternate expansioniand contractionof said fluid cells in ,nate expansion and contraction of said fluid cell cure and contraction of said cell, and means retarding radial expansionand contraction of said f fluidcell while permitting longitudinal deformations thereof.
5. A fluid pump comprising an elastic body having a plurality of annularly spaced fluid cells therein, fluid inlet and outlet conduits, valve means movable to provide alternate connection of said fluid cells successively with said fluid inlet and outlet conduits, check valve means associated with said fluid inlet and outlet conduits for controlling fluid to travel in only one direction therethrough in response .to alternate suction and pressure forces therein, means operably connected to said elastic body for cyclic elastic elongation and shortening of annular portions thereof in consonance with movements of said valve means for successively elongating and shortening 7 said cells, and means retarding lateral expansion and contraction of said fluid cells incidental to longitudinal deformation thereof.
6. A pressured fluid displacement mechanism comprising an elastic body having a plurality of fluid cells therein arranged concentrically 01 an axis, fluid inlet and outlet conduits, check valve means associated with said fluid inlet and outlet conduits for controlling fluld to"travel in only one direction therethrough ln response to alternate suction and pressure forces therein, valve means rotatable about said axis to provide alternate consonance with movements of said valve means.
4. A fluid pump comprising an elastic body having a fluid cell therein, a fluid inlet-outlet system in open communication with said fluid cell, check valve means associated with said fluid inlet-outlet system for controlling fluid to travel in only onedirection therethrough in response to alternate suction and pressure forces therein,
connection of said fluid cells successively with said fluid inlet and outlet'conduits, and means operably connected to saidelastic body for elastic deformation there to produce alternate expansion and contraction of said fluid cells cyclically in synchronism with rotation of said valve means,
. ROBERT J. woons.