US2397594A - Hydraulic motor or pump - Google Patents

Description

April v1946- J. D. BUCHANAN 2,397,594

HYDRAULIC MOTOR OR PUMP Filed Jan. 6, 1945 2 Sheets-Sheet l 1 i .1; 3 2 19 4 5 1 @1 1 J /V 13 70 v w v J5 16 55 16 5239 8 J4 a? 5 a Z 1.6 ii? J4 19 17 13 F 1 D. .gUCH/J/VAN,

INVENTOR.

ATTORNEY.

April 1946. J, D. BUCHA'NA'N M 2,397,594

HYDRAULIC MOTOR OR PUMP Filed Jan. 6, 1945 2 Sheets- Sheet 2 w Pressure [319 4/.

WW 4 A l 57%7 fi s/must jfi'yufil I 1' I r ZID. fiucHA lA/w IINVENTOR.

ATTORNEY.

' whether inlet.

- plungers.

Patented Apr. 2, 1946 PAT HYDRAULIC Moron, on romp J. D. Buchanan, Burbank, Calif. Application January 6, 1945, Serial No. 571,631

I v Clainis. The invention relates to a *hydraulic'or fluid motor or pump of the. well-known type wherein therotor is" provided with a wobble plate 'actuated by or actuating a series of plungers, de-

pending upon whether the device is employed as a motor or pump. The rotor of thedevice is provided with a rotary valve to control the fluid flow.;

In one type' of. wobbl 'plate' motor or pump, as

constructed heretofore, the rotary valve is in the.

form or a. channel on the periphery of the rotor, one side of the channel lyin'g in aplane which is at rightangles' to thelongitudinal axis of the rotor, the other'side of the channel being in the form of a curve to supply'the fluidpressure to or from theplungers in sequence. The disadvantage of this construction is that the side- 1 walls of the channel are not symmetrical'as to their angular position with respect-to the axis or the rotor, whereby the inclined side wall has a thrust on the rotor.

I An obiect of the present invention is to avoid the above defect and this is'accomplished by providing an improved rotary valve having a construction which reduces or to a large extent eliminates the lateral thrust on the rotor.

Another object of the invention is to reduce:

or substantially eliminate longitudinal thrust on the'rotor due to the longitudinal thrust on the rotary valve and on the plungers associated with,

the wobble plate. This is accomplished by providing. stem end of the-rotary valve a piston area which ofisets the sum of the longitudinal thrust on the rotary valve and on the plungers, and by arranging at the other end of the valve a piston area-which oflsets the difference in those thrusts. The casing is provided with'a pair of. passages either of which may serve as in inlet when'the other is serving as 'an outletQso that the direction of rotation may be reversed, The feature last mentioned substantially balances the rotor for longitudinal thrust, regardless of one passage or the other is used as an For further details may lie-made to the drawings, wherein:

- Figure l is a longitudinal sectional view through an'improved 'motor or pumpaccording to the Fig. 1 with same construction shown in the other figures with the addition thereto oifsprings for operating the Referring in detail to the drawings, the motor or pump 1 is of the well-known wobble zplate lateral componentresulting in lateral or 'side.

time invention, reference wherein a wobble plate '2 is mounted on a ball bearing 3 suported on a bearing block 4 in a tilted position as'shown. The bearing blockA is secured by a keyli to the shaft 8 of the rotor I. o.

. Shaft 8- is supported in a bearing III in a cap and also ina bearing 9 in. one end wall .10 of the casing l l and in a bearing I2 in acap I3 at the other end 01 casing ll. I

by, or operates a series of plungers ll here, shown as six-in number, althougheanyothersuitable number may be used. Each of the plungers ll slides in a bore such as I! which-extends parallel to the axis of shaft I. The casing is provided with a valve bore l8 and all oi the plunger ably the piston bores l5 arearranged in pairs diametrically opposite each other so that the.

piston bores IS with the valve'borei6 may be drilled one pair at a time and the. outer end of the passage may then be sealedoil by a plug ,as indicated at Ill. The plugs for the other two pairs of plunger boresare indicated in Fig. 3 at 20 and 2|.

The shaft 6 which controls the fluid pressgre to and exhaust from the plungers. ll. At one end of valve 22 the casing III is provided, with a passage 23 which end of valve 22 casing H is provided witha passage24 adapted to serve as an outlet when 23 1 is an inlet,.and as an inlet when 23 is, an outlet. 5 'According to the present invention, the, valve 22 is provide'd with a pair 01 ' channels 25 and 26 each having side walls 21, 28 and 28, 80,, respectively, which are similarly inclined with respect to the longitudinal axisroftherotorl whereby side or lateral thruston the rotor l is, toa large extent, eliminated. v v v a The two channels '2! and 26 are separated by the inclined wall 3| so that each channel is always sealed oil from the other channel. In other 5 words, it we start atthe top or channel 25 in Fig. 1 and follow around this channel, we will arrive back at the starting point, and the same-is true of channel as; This is further illustrated mane 1 developed view in Fig. 4 wherein it isclearxthat if this figure were. rolled up into a cylinder, the opposite ends of channel 25. as shown in this fig-. ure would be connected together, and the sarne. is true of channel 2|. a j

Opposite the passage 22, the rotor 1 has a dimeter ora reduced section 22 which is smaller than the bore ii, the left sided the reduced section 82 merging with a wall portion." which extends at right angles to the axis-oiL-rotor 1. Around the reduced section" 22 is a chamber 24 which communicates with the passage 23, and

ENT

The wobb1e plate 2, as wellness, is operated bores such as I! open into the-bore l8. Prefercross passages like I! and I8 which connect the v is provided with a rotary valve 22 may be an inlet or an'outlet and at the other It will be apparent thatvarious may be made in the invention without departing.

groove 25 opens into this chamer at one side of rotor 1 where the inclined wall 21 intersects the straight wall 23 as indicated at 26. The opening 2 35 thus 'maintalnsthe groove always income.

munication with the passage 22. V

The channel 28 is similarly constructed except thatitsinclined wall 30 opens into the chamber 22 at a point 21, which is diametrically'opposite the point 35. Chamber 2| always communicates I with the passage 24. 7

when passage 22 is serving as an inlet; fluid pressure in channel 2! exerts a lateral pressure 1 on wall 28 in one direction of an amount just the same as that exerted on wall 21 in the opposite 1 direction, except forthe diflerence in the length of the lateral components'of these walls, due to ",the cut away portion 25 where channel opens 1 intothe. chamber 24. In onedesign, it was found i ;that.-this?diflerence is about ten percent (10%) which is permissible. The same considerations sage serves as an inlet. The rotor,therefore, is substantially balanced against lateral thrust regardless of which of the passages 22 and 24 serves asaninletf' Each of the plunger passages like l1 and ,II terminates'in a plunger port shown at I2 and I5 a,ao7,sa4 v V r 7 having a stator with inlet and exhaust passages and a seriesiof plungers,-and a cooperating rotor having a wobble plate, and having a rotary valve having a pair of peripheral channelscontrolling fluid supply to and exhaust'fi'om said plungers,

the improvement in said rotary'valve wherein said channels have side walls similarly inclined with respect to the axis of said valve to offset lat- .eral thrust on said valve from fluid pressure at said inlet.

2. ma wobble plate type of motor or pump havinga stator with inletand exhaust'passages and a series of lungers, and acooperating rotor having a wobble plate and having a rotary valve having a pair of peripheral channelscontrolling fluid supply to and exhaust from saidplunger's,

' the improvement which comprises a piston on apply towalls 28 and lfl of'cha'nnel 22, whenpas,

m Fig. -2. the six ports being indicatedat u to st .-in Fig. 4. The center linesof the plunger ports II to liilie in a plane which is at right. angles cated' by-the line 51in Fig. 4.v Also, as will be apparent from Fig. 1, and Fig. 4, that plane inl tersects-both of the channels 25 and 28 whereby.

certain of the plunger ports. are -connectedto the inlet supply at the time when other plunger;

ports are connected to the exhaust. .Also, one of the such ash is fully opened to'the'inlet pressure at thetime that a diametricallyopposite port is fully open to the exhaust. The channels '25 and 26' serve to'connect-the various plunger ports ii to 56 to the supply and'exhaust,

in the Opposite direction .on the left end of piston 28, which is provided with anrannular area 29 'suflicient to counterbalance those thrusts.

When passage 24 serves as an inlet, the longitudinal thrust onthe left end of. valve 22 is in 'a directionto the right, over an areaequal to the'diflerence in 'crosssectional'area of wall 3| m bore l6 and the area of shaft s in bearing a while an equal :thrust on the rotor due to the:

pressure operated plungers I4 is tothe left. The

.' rotor shaft I is, therefore, balanced against lon-I the -pasgitudinal'thrust regardless of which of sages 22 and 24 is used as an inlet.

I'n.the modification showninfFig. 5, a com pression spring like may be arranged in each plunger bore 42 inorder. to urge each plunger saidrotor to offset longitudinal thrust onsaid rotor due to the sum of the thrusts on said ro- 1 tary valve and on said plungers.

3. In a. wobble plat .type of motor or pump having a stator with inlet and exhaust passagesand a series of plungers, and a cooperating rotor having a wobble plate and'having a rotary valve having a pair ofperipheral channels controlling-.1 fluid supply to and exhaust from said plungers,

the improvement insaid rotary valve wherein said channels have sidewalls similarlyinclinedfj with respect to the axis of said valve to oflset so to the axis'of the-rotor 1, and this plane is indi-Q- lateral thrust on said valve from uid pressureat said inlet, and a; piston and shaft on said rotor at opposite ends of said rotary valve, said piston oil'setting longitudinal thrust on said rotor dueto the'sum of the longitudinal thrusts on said rotaryvalve and on said plungers, and the thrust on the difl'erenceinicross sectional area of said valve and said shaftofisetting longitudinal thrust on said rotor due to said plungers, whereby said rotor issubstantially balanced for longitudinal and lateral thrusts forflow inone direction or they reverse directionthroughsaid pas:-

' sages.

, casing"having inlet and exhaust passages and 4-. In a wobble plate type of motor or pump, av

plunger ports, arotary valve in said casing, said valve having two reversely inclined parallel channels of which one opens into one of said passages v at one side of said valve and the other channel opens into the other passage at the other side of said valve. the centers of said plunger ports lying in; a plan at right angles to the valve axis, said plane intersecting one portion of one of said channels and another portion of. the other channel and said channels being constructed and arranged ,to" connect said plunger ports to supply 7 and exhaust inaprogressive manner. v 5. A wobble plate'motor or pump havingga sta I tor with inlet and exhaust passages and a series .of plungers, a bearing in saidstator, a cooperat ing rotor-having a shaft,.said rotor having a wob- -ble plate on said shaft at one side of said bear- I ing and having a rotary valve on said shaft at the other side of said bearing, said rotary valve having a pair of peripheral channels controlling fluid like 43 against the wobble plate 44. Otherwise, 7 the construction in Fig. 5, is the same as that described above. a

fromthe spirit of I the following claims. I claim:

. 1. Ida wobble plate type-of'motor or pump.

4 g improvements supply. to and exhaust from said, plungers, said inlet communicating with th end of said rotary valve adjacent said bearing,vthe,thrust of said plungers on said wobble plate being effective in one direction of said rotor, and the cross-sec;

tional area of said shaft being smaller than. the

cross-sectional area of, said rotary valve to pro-' vide a thrustinthe opposite'direction whichoifsets said thrust of said plungers. j

. J, D.. 'B

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