US2632400A - Hydraulic mechanism - Google Patents

Description

March 24, 1953 w, MA 2,632,400

HYDRAULIC MECHANISM Filed March 23, 1949 4 Sheets-Sheet l W VEN TOR Walter H Marsh F 6 Arlorn eys March 1953 w. H. MARSH 2,632,400

' HYDRAULIC MECHANISM Filed March 23, I949 4 Sheets-Sheet 2 //v VEN TOR Walter H. Marsh 5, ,mmz

A ffameys March 24, 1953 w. H. MARSH 2,632,400

HYDRAULIC MECHANISM Filed March 23, 1949 4 Sheets-Sheet 3 figs 94 //v VEN 70/ Walter H. Marsh 98 k Attorneys 6 i/MJ/ Mag-ch 24, 1953 w. H. MARSH I 2,532,400

' HYDRAULIC MECHANISM Filed March 25, 1949 4 Sheets-Sheet 4 //v VE/V 70/? Walter H. Marsh By /M wwaw A r for/1e ys Patented Mar. 24, 1953 HYDRAULIC MECHANISM Walter H. Marsh, Grafton, Pa., assignor to Rockwell Manufacturing Company, Pittsburgh, Pa., a corporation of Pennsylvania Application March 23, 1949, Serial No. 82,940

This invention relates to hydraulic apparatus or" the rotary type which may be used either as a motor or a pump and has for its general object and purpose to provide a simplified mechanism of this kind, the several parts of which may be quickly and accurately assembled within an outer casing for eflicient and reliable operation.

It is a more particular object of the invention to provide an improved rotor with an improved mounting of rotor vanes therein, together with a cooperating division plate for pre-assembly with the rotor and insertion therewith between the inlet and outlet ports in the wall of a working chamber.

Another object of the invention is to provide a double-acting hydraulic pump or motor having division plates spaced 180 degrees apart between inlet and outlet ports in a liner sleeve, together with operating gearing for the rotor vanes and means for accurately timing the rotation of the vanes by said gearing relative to the rotor so that the vanes will safely pass over the division plates without interference.

It is a further object of the invention to provide a novel rotor and chamber ring construction which facilitates the accurate assembly of the vanes therein and permits the use of large size bearings of substantially equal diameter to the vane.

An additional object of the invention resides in the provision of an annular peripheral fluid receiving chamber in the rotor intersecting the vane openings together with a novel sectional ring and division plate assembly in said chamber slidably keyed to the liner sleeve for axial movement with the rotor, and having a face to face sealing relation to the opposite side walls of said chamber.

With the above and other objects in view, the invention comprises the improved hydraulic apparatus as above characterized and the construction and relative arrangement of the several parts, as will hereinafter be more fully described, illustrated in the accompanying drawings and subsequently incorporated in the subjoined claims.

In the drawings wherein I have disclosed one simple and practical embodiment of the invention and in which similar reference characters designate corresponding parts throughout the several views:

Figure 1 is a horizontal longitudinal section taken substantially on the line 1-! of Figure 2 and showing a preferred assembly of my present improvements;

15 Claims. (Cl. 103-443) Figure 2 is a vertical transverse section taken substantially on the line 22 of Figure 1;

Figure 3 is a vertical longitudinal section of the outer casing taken substantially on the line 3-3 of Figure 2;

Figure 4 is a developed interior plan View of the casing;

Figure 5 is a vertical sectional view of the chamber ring and division plate assembly;

Figure 6 is an inner side elevation of one of the chamber ring sections;

Figure 7 is a transverse sectional view taken on the line 1-! of Figure 5;

Figure 8 is a detail plan view of the division plate;

Figure 9 is a side elevation of one of the rotor vanes; v

Figure 10 is an end view thereof on an enlarged scale.

Figure 11 is an outer side elevation of one rotor shaft bearing and housing assembly;

Figure 12 is a detail elevation of one of the end covers for the outer casing;

Figure 13 is an inner side elevation of the bearing housing and sun gear assembly;

Figure 14 is a vertical sectional view taken substantially on the line I l-l4 of Figure 1;

Figure 15 is a side elevation of a modified form of rotor; and

Figure 16 is a section taken on line 16-16 of Figure 15.

For purposes of illustration, in the present instance I have shown my improvements as applied to a hydraulic motor or pump of the double-acting type in which two intake and discharge phases occur in each revolution of the rotor. However, it will be understood that many of the novel features of the invention to be pres-, ently described are applicable as well to a pump or motor of the single-acting typeQ Referring for the present more particularly to Figures 2, 3 and 4 of the drawings, the outer casing or housing structure [0 is of general cylindrical form and provided with inlet and-outlet connections l2 and M respectively spaced degrees apart. The cylindrical wall of the casing may be externally provided with spaced. pairs of mounting lugs or ribs l6 and I8 respectively having tapped bores, which may be rigidly secured to a supportingbase 2!] by suitable bolts 22 with the. inlet connection l2 or outlet connection I4 disposed either vertically or horizontally with relation to the casingbody.

The casing in is internally formed with opposite end flanges 24 and anintermediateweb or rib 26 which is circumferentially continuous and direct communication with the respective inlet and outlet ports I2 and I l.

The liner sleeve 36 which provides the working chamber and all stationary and movable parts associated therewith are first assembled externally of the casing Ill and then insertedas a unit to operative position therein. The liner sleeve 36 is of slightly less length than the casing II] and is centrally provided with inlet ports 38 spaced apart 180 degrees and with outlet ports 40 also spaced apart 180 degrees and located in predetermined spaced relation from the respective inlet ports. When the liner sleeve is mounted in the casing, these ports 38 and 49 are in communication with the casing chambers 32 and 34 respectively at relatively opposite sides of two diametrically opposed sections 38 of the rib which segregates the chambers 32 and 34 from each other.

To an intermediate section of the rotor shaft 42, the rotor 44 is non-rotatably connected by the key 46. rotor shaft receive snap rings 59 to prevent axial displacement of the rotor relative to said shaft. The rotor 42 is formed with four cylindrical vane receiving openings 52 spaced apart 90 degrees Circumferential grooves 48 in the which are on uniform diameter from end to end of the rotor. The rotor is further provided intermediate of its ends with an annular fluid receiving chamber 54 which intersects the openings 52.

As seen in Figure 9 of the drawings, each of the rotor vanes comprises acylindrical body portion 56 which is cut away on one side intermediate of its ends to form a recess or pocket 58 having an arcuately concave bottom surface 60. The Width of this vane pocket is substantially equal to the width of the annular chamber 54 in the rotor. The vane body 56 is provided at each end with a coaxial diametrically reduced cylindrical extension 62 and 64 respectively which journal the vane in ball bearings 56 of equal diameter to the vane body 56 mounted in opposite ends of the opening 52 in the rotor. The bearings are held against axial movement by the snap rings 68 positioned at the outer sides of the bearings in grooves formed in the wall of opening 52. The extension 64 at one end of the vane body 56 has a further cylindrical reduced axially projecting portion I0 which is formed with splines I2 one of which is accurately centered on the diameter which bisects the recess or pocket 58.

The splined portion I0 has a further reduced threaded terminal extension '14 to receive a retaining nut I6 for the vane driving gear or, pinion I8. This vane gear is internally splined to mate with the splines I2 and the gear teeth are formed so that one tooth is in radial .alinement with a space between the internal splines so that the gear teeth will also be accurately positioned relative to the recess or pocket 58.

As shown in Figures 1 and 14 of the drawings between the vane gears I8 idler gears 80 are arranged. Each of these gears is fixed to a short 4 shaft 82 journalled at one end in a roller bearing 84 mounted in a recess in one end of the rotor 44. These shafts at their other ends are journalled in similar roller bearings 86 mounted in a cage member 88 which is rigidly secured to one end of the rotor 44 by suitable screws, indicated at 90 in Figure 14 of the drawing.

Referring now to Figures 5 to 8 of the drawings, a chamber ring and division plate assembly is arranged in a relatively stationary position within the annular chamber 54 of the rotor. In the present embodiment of the invention, the chamber ring consists of two substantially semi-circular sections 92 of equal diameter. Each of these ring sections is provided with openings 94 and 95 respectively which are adapted to register with respective inlet and outlet ports in the opposite sides of the liner sleeve 36. Each ring section is further provided with internal key-ways 98 extending from the openings 94 and 96 to the ends of the ring section. As shown in Figure 7 of the drawing, between each opening in the ring section and the adjacent end thereof, a counterbored screw receiving opening I60 is provided in intersecting relation to the key-way 98. The large diameter section of this opening receives the head of an attaching screw I62 for a division plate I04, said screw head bearing upon the shoulders I06 formed by the small diameter section of the opening I00 at each side of the keyway 98.

Each division plate I04 is arcuately curved to provide inner and outer surfaces substantially concentric with the ring sections 92. The outer surface of the division plate is centrally formed with a longitudinally extending key rib I08 for engagement in the key-ways 98 of adjoining ends of the two ring sections 92, and at each end thereof, is provided with a tapped opening III) to receive the threaded shanks of the attaching screws I02, the heads of which are received in recesses H2 in the key rib I08. Between the screw receiving openings I I I! in the division plate, said plate is centrally provided with a key receiving slot H4, in which a fiat metal key IIB has a driving fit and projects outwardly therefrom between the opposed ends of the ring sections 92 and in radially projecting relation to the outer circumference of said ring sections. As seen in Figure 2 of the drawings, these outwardly projecting portions of the two keys IIB are adapted to be fitted in diametrically opposite longitudinally extending internal key-ways II8 formed in the wall of the liner sleeve 36. Thus the chamber ring and the division plates will be non-rotatably held in position with respect to the liner 36. The outer edge faces of the chamber ring sections 92 form a running seal with the inner side walls of the rotor chamber 54 while the inner concave surfaces of the division plates I84 similarly form a running seal with the bottom of the fluid receiving chamber 54 of the rotor 44. The peripheral surfaces of the vanes 56; also have substantial fluid sealing contact with the. inner surfaces of ring sections 92'.

One end of the rotor shaft 42 is adapted to be journalled in a double roll ball. bearing 52!! mounted in a ring I22 having an external flange I2 1 for abutting contact against one end of the liner sleeve 36. A sun gear I26 is formed at one end of a sleeve I23 which loosely surrounds the rotor shaft 42. The other end of the sleeve I28 is provided with an outwardly extending annular flange I36 having a dowel pin I32 engaged in an opening I34 in the ring I22. The ring I22 and the sleeve flange I38 are rigidly secured together by means of screws I36. It will be noted from reference to Figure 13 of the drawings that one of the teeth on the sun gear I26 is accurately centered on the same radius as the dowel pin I32.

The outer face of the ring I22 is recessed to receive the retainer ring I38 for the outer race of bearing I25 which is secured to said member by suitable screws we while a retainernut I42 for the inner race of bearing I is threaded upon the reduced end of the rotor shaft 42.

As pointed out above, the splines 12 on vanes 58 are in predetermined position relative to the pockets 68, the teeth on the vane gears l8 are in predetermined position relative to the internal splines, and the teeth on the sun gear I26 are in predetermined position relative to the dowe1 pin opening I 34. This results in'simplicity'of manufacture of each individual part but does result in a cumulative error in the positioning of the vanes '55 relative to the division plates I04 as the rotor is rotated. It has been found preferable to thus simplify the individual parts and to eliminate the accumulated error at one point rather than to position the teeth, splines and dowel hole on each part so that no error is introduced. The accumulated error introduced by alining the teeth, splines and dowel hole as described above will vary depending upon the size of the unit, the number of gear or spline teeth and other factors and in one embodiment of the invention amounts to approximately three degrees, forty-nine minutes in the angular position of the sun gear.

In order to eliminate this accumulated error, the ring I22 is provided with a tapped hole I43 which is out of radial alinement with the dowel hole I32 by the amount of the accumulated error, which, in the embodiment mentioned, would be three degrees, forty-nine minutes.

A screw I46 having an enlarged head which projects outwardly from the ring I22 is threaded into the tapped hole Hi3. For a purpose which will be later described, the ring I22 is also provided with four tapped holes 14d of the same size as the hole I43, two holes I45 being on each side of the hole I43. tance from the center of the ring I 22 as the hole I43 and the two holes I44 on each side of the hole I43 are spaced seventy-three degrees apart and seventy-three degrees from the hole I43.

A flanged cover I48 is provided for this end of the outer casing or housing. The cover flange has a plurality of equi-distantly spaced openings I50 to receive attaching screws I52 threaded into tapped bores I54 in the end of the casing wall. Preferably an annular gasket I56 of suitable material is interposed between the cover flange and the casing wall. The inner face of cover mnember its is provided, on the same diameter as the openings I43 and I44 in ring I22, with a plurality of recesses I58 which are circumferentially spaced apart 72 degrees, the purpose of which will be presently explained in connection with the final assembly of several parts relative to the outer casing or housing. Preferably, an annulus of suitable packing material, indicated at I60, is also interposed between the inner face of cover member 548 and the bearing retaining ring I38.

The rotor shaft 42 is also journalled in a double row ball bearing I62 mounted in a housing member I64 having an external flange I66 abutting the opposite end of liner sleeve 36. A spacing collar is interposed between the inner face of the bearing and the snap ring 50 on the rotor shaft as indicated at I68. The housing member The holes I 54 are the same dis- I64 is provided with longitudinal key-ways I III to mate with the ends of key-ways H8 in the sleeve 36 and receive the keys indicated at I12. Member IE4 is further provided at diametrically opposits points with bores IE4 to receive the locate ing dowels I16 carried by the end cover member 78 for the casing I6, between which and the attaching flange of the cover member an annular gasket I88 is interposed. The cover flange is provided with circumferentially spaced openings similar to those in cover member I48 to receive the attaching bolts I82 threaded into the tapped bores I84 in the end of casing Ill.

As herein shown a flanged collar I86 is mounted in the cover member I18 and loosely surrounds the rotor shaft 42. It is held against rotation by the radial pin I 88 on the cover engaged ina slot in one end of said collar.. The collar I86 is surrounded by a fluid sealing ring I90 p'ositioned'in an annular groove formedin cover member I18. Between the flanged end of collar I86 and the inner race of bearing I62, arotating mechanical face type shaft'seal I92 is keyed to the shaft. Suitable seals are well known intheart. f

At the opposite end of the casing I6, between two of the bolt receiving bores I54, a dowel pin I4 is secured therein. Thispin is preferably located substantially mid-way between the inlet and outlet connections I2 and 'I4o f the casing and the projecting end thereof isadapted to be received in a cylindrical recess or bore I96 provided in the inner face ofthe attaching flange on cover member I48. As shown in Figure 12,

. one of the recesses I58 is in radial alinementwith the dowel hole I96. 7

In assembling the above described parts, with respect to the outer casing or housing, the bearing i253 with ring I22 and sun gear I26 are first assembled on the end of the rotor shaft 42. After applying one of the stop rings 56 to shaft 42, the rotor 44 with case 88 and idler gears therein is then mounted on the shaft'by means of key46 and the other stop ring 50 applied to the shaft. The idler gears are thus positioned in the radial plane of sun gear I26 and in meshtherewith. M

The vanes 56 with their end bearings 6-6 are now inserted longitudinally into the openings 52 of the rotor. For the purpose of accurately es tablishing an initial position of the vane pocket 58 radially of the rotor axis, each vane is preferably provided on its cylindrical surface at diametrically opposite sides thereof with longitudinally extending core lines or gauge marks 26!) which are circumferentially spaced a predetermined distance from the respective edges of the concave surface 60-of the vane. First two ofthe vanes are inserted into diametrically opposite openings 52 in the rotor with the gauge lines 206 on the Van-e in registration with the points of intersection of the circumferential base wall of chamber 54 with the opening 52 and with the pocket 58 in the vane facing inwardly towards the axis of the rotor. A rotation is now imparted to the rotor whereby idler gears 80 in mesh with the relatively stationary sun gear I26 and vane gears 18 will rotate the two vanes so that the pockets 58 thereof will open outwardly in. the chamber 54. The other two vanes are then inserted with the gauge marks 200 thereon registering with the points of intersection of the other openings 52 in the rotor with the circumferential surface o'f chamber 54. It will of course be understood'tha'fi 7 in the insertion of each vane to its applied position, the drive gear 18" therefor meshes with one of the idler gears 80.

The division plates I04 with keys II6 are now attached to relatively opposite ends of the respective chamber ring sections 92 by one screw I82 and said ring sections then inserted from opposite sides of the rotor into chamber 54 so that ends of the ring sections respectively opposing the ends of the ring section to which the division plates are attached will receive the key ribs I08 on the respective division plates and are then attached to said plates from the other screws I02. This rotor and division plate assembly is now inserted into the liner sleeve 36 from one end thereof, the projecting portions of the keys II6 being slidably fitted into the key-ways II8 of the sleeve wall. Thus, when the flange I24 on ring I22 abuts the end of sleeve 36 the rotor will be axially positioned with the division plates I04 located between the inlet and outlet ports 38 and 40 of the liner sleeve 36 and With openings 94 and 96 in the chamber ring sections in accurate registration with the respective ports in said sleeve. The peripheral surface of the ring I22 has a snu rotative fit within the end of the sleeve 36 for limited adjustment of said. housing member and the sun gear I26 when cover member I48 is applied, as will be presently explained.

Spacing member I68 is now inserted over the rotor shaft, and bearing I62 and its housing member I64, then inserted into the other end of the liner sleeve 36 with keys I12 locking said housing member to the sleeve against relative rotation. The rotating shaft seal member I92 is then inserted over end of shaft. When the cover member I18 isnow applied and its dowels I16 engaged in the bores I14 and secured to the end of the casing by bolts I82, the sleeve and bearing housing are rigidly held against rotative displacement relative to the casing.

The other end cover I48 for the casing is finally applied. The projecting end of dowel pin I914 is received in the bore I96 of the cover member while the head of screw of I46 is re ceived in a. recess I58 in said cover member. Thus as the cover member' I48 is moved to' its final position'in which the dowel pin I94 willenter the: dowel hole I96; aslight rotativem'ovement will be imparted to. the ring I22 and sun gear'l26 rotated through the same angle as the angle between dowel hole I34 and tapped hole- I4'3 in ring. I22.

Assembly of the cover I48 with the screw I46 in tapped hole I43 properly positions the vanes 56 if all of the parts are wholly accurate; If however there are mechanical inaccuracieswhich afiecttimin-g so that the vanes 56 do not properly clear the division plates I04 these inaccuracies can becompensated by removing the" screw I46 from the hole I 43 and placingit in one of the holes I44 where it will engage with a corresponding recess I58 in the cover I48. As pointed out above, the holes I44 are sp'acedseventy three deg-reesapart while the recesses I58 are only seventy two degrees apart so that the four holes I44 permit two degrees of adjustmentof the angular position of ring I22 and sungear I26'in each direction. If the sun gear I26 has twice as many teeth as the vane gears 18, a two degree change'in the angular position of the sun gear I26 causes a" four degree change. in

he an ular position, of r the. vanes i 6 relative to 8 the rotor. It will of course be understoodthat screw I46 functions as a key to restrain ring I22 against any further rotative movement relative to the liner leeve from its adjusted position and to retain the sun gear I26 in a stationary or fixed position relative to the rotor shaft.

From the above description, it will be seen that unlike prior apparatus of this kind, the division plates are notsecured in fixed position relative to the working chamber but are slid-' ably keyed to the liner sleeve 36. Thus, in the event of any slight axial play of the rotor shaft or axial displacement of the rotor relative to the shaft, the chamber ring sections and the attached division plates I04 will move axially as a unit therewith. In this manner, high frictional wear and excessive resistance to rotation of the rotor is avoided and precise axial positioning of the rotor with respect to the di" vision plates in assembling is rendered unnecessary.

The construction of the rotor and chamber ring by which the chamber ring extends into the chamber formed in the rotor is an important feature of the invention since it results in face sealing between the rotor and chamber ring rather than edge sealing and also permits the use of larger vane bearings. This simplifies and facilitates both manufacture and assembly of the apparatus.

While I prefer to make the rotor 44 of one piece and to make the chamber ring 82 of two pieces so that the chamber ring can be mounted in the chamber 54, it is possible. to make the rotor of two pieces as shown in Figures 15 and 16. The chamber ring 92 may then be made as shown in Figures 5, 6 and '1 but need not be separated for assembly or may be made of a single piece.

The rotor shown in Figures 15 and 16 comprises a body 2I8 having a central bore 2 for receiving the shaft 42. The body 2H3 has a reduced portion 2'I3 and a fiat wall portion 2I4 extending radially from one end of the reduced portion 2 I3. A flat plate 2 I5 is secured to the body 210 at the other end of the reduced portion H 3 by screws or bolts M6. The wall portion 2I4, reduced portion 213 and plate 2I5 form an annular fluid chamber identical in form with the fluid chamber 54.

While the plate 2 I 5 is'secured to the rotor body 2 I0, the vane openings 2 I1 and a keyway 2I8 are formed in the rotor body and plate assembly. The plate '2I5 may then be removed and the chamber ring and division plate assembly shown in Figure 5 may be placed in position without being disassembled. The plate 2I5 is secured to the rotor body 2I0'and the keyway 2I8 assures accurate alinement of the vane openings'in the plate and rotor body.

The liner sleeve 36 is maintained in a fixed axial position between the end cover members I48 and I18 for the outer casing While the dowels I16 serve to accurately position the liner sleeve with its inlet and outlet ports 38 and'48 respectively located at relatively opposite sides of the longitudinally extending portions '30 of the separating rib 26 between theinlet and outlet chambers 32 and 34 respectively of the casing I 6. Thus, it will be'understood, from reference'to' Figure 2 of the drawings that in each revolution of the rotor 44, each of the rotating vanes 58 operates to twice transfer liquid in predetermined volume from the inlet chamber 32 of the" casing I8 to the outlet present. improvements may be also applied to a' single acting type of hydraulic apparatus, in which the use of only one division plate is required.

It will be appreciated that the present invention provides an hydraulic apparatus of this kind involving a minimum number of mechanical parts of simple structural form which may be expeditiously and accurately assembled for maximum operating efficiency without necessitating special knowledge or unusual manual dexterity. While the mechanical principles of the invention are illustrated by a selected embodiment thereof, in the construction of apparatus of a required ca pacity designed for a particular use, it may be found desirable to substitute parts of somewhat difierent structural form but having equivalent functional characteristics of corresponding parts of the apparatus herein described.

The invention may be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiment is therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

What is claimed and desired to be secured by United States Letter Patent is:

1. In hydraulic apparatus of the rotary type having a cylindrical wall forming a working chamber and circumferentially spaced inlet and outlet ports, a rotor mounted in said chamber having an annular peripheral chamber in fluid communication with said inlet and outlet ports and a plurality of circumferentially spaced cylindrical openings extending longitudinally through the rotor in intersecting relation to said annular chamber, a relatively stationary division plate in said annular chamber between said ports, a sealing chamber ring fixed to said division plate between opposite side walls of said annular rotor chamber and in running contact with the inner faces thereof, said chamber ring having spaced openings therein registering with said inlet and outlet ports respectively, a vane rotatably moun ed in each of said openings, and means for operating said vanes in timed relation to the rotation of the rotor comprising a sun gear, means mounting said gear in fixed co-axial position in the working chamber relative to said rotor, a housing fixed to one end of the rotor, a plurality of idler gears in mesh with said sun gear each having a shaft journalled at opposite ends in said housing and rotor respectively, and a gear fixed to one end of each vane within said housing in meshed engagement with one of said idler gears 2. Hydraulic apparatus as defined in claim 1, together with additional means for rotatably adjusting the sun gear to initially establish a predetermined position of the vanes in the rotor for uninterrupted movement with and relative to the rotor over said division plate.

3. In hydraulic apparatus of the rotary type, a casing having fluid inlet and outlet connections, rotary mechanism mounted within said casing including a rotor having an annular peripheral chamber in fluid communication with said inlet and outlet connections and a plurality of vanes rotatably mounted in the rotor in intersecting relation with said chamber, a relatively stationary division plate in the rotor chamber between said inlet and outlet connections, and means for timing the rotation of said vanes relative to rotation of the rotor for non-interfering movement of the vanes over the division plate, comprising gearing operatively connected with the vanes and including a relatively stationary sun gear in co-axial relation with the rotor, an end cover for said casing, a member havin a fixed connection with said sun gear, and said cover having means co-acting with said member in movement of the cover to applied position relative to the casing to rotatably adjust the position of the sun gear and initially establish a predetermined position of the vanes in the rotor.

4. Hydraulic apparatus as defined in claim 3, wherein a recess is provided in said end cover and a dowel pin is fixed to the end of the casing and engaged in. said recess to support and direct the cover to its applied position.

5. Hydraulic apparatus as defined in claim 3, together with a ring, a bearing mounted in said ring, a supporting shaft for the rotor journalled at one end in said bearing and means rigidly ccnnecting said sun gear to said ring, and wherein said member is carried by said ring and coacts with the means on the cover to retain said sun gear and ring in a stationary position.

6. Hydraulic apparatus as defined in claim 5, in which said connecting means comprises an end flange on said sun gear and a dowel pin connecting said end flange to said ring and located in radially centered relation to a tooth on said sun gear, and wherein said ring is provided with a plurality of circumferentially spaced openings, said member being engaged in one of said openings adjacent to the dowel pin but out of radial alignment therewith) and the co-acting means on said cover comprises a plurality of recesses therein in different circumferentially spaced relation from the openings in said ring for selective engagement with said member.

7. In hydraulic apparatus of the rotary type, an outer casing provided with inlet and outlet connections, a unitary assembly axially insertable within said casing comprising a liner sleeve for the casing having circumferentially spaced inlet and outlet ports and an axial keywayextending between said ports, a shaft having a rotor fixed thereto provided with an annular peripheral chamber and a plurality of vanes mounted in said rotor and movable relative thereto, and a division plate in said rotor chamber provided with a key slidable in said keyway in the axial insertion of the shaft and rotor within said liner sleeve to position said division plate between the inlet and outlet ports in non-rotatable relation to the rotor and said liner sleeve,

8. Hydraulic apparatus as defined in claim 7, wherein said assembly further comprises bearing supporting housings for the rotor shaft, closing the opposite ends of said liner sleeve.

9. Hydraulic apparatus as defined in claim 8, together with operating means for the rotor vanes including a stationary member fixed to one of said bearing housings.

10. Hydraulic apparatus as defined in claim 7, wherein said assembly further comprises a hearing supporting housing for the rotor shaft fixed at one end to the liner sleeve, and an end cover member for the outer casing having means to co-act with means on said housing and non-rotatably position the liner sleeve in said casing with said inlet and outlet ports thereof in fluid communication with the inlet and outlet connections respectively of said casing.

11. In hydraulic apparatus of the rotary type, a casing having an inlet port and an outlet port spaced from said inlet port a rotor having a central hub portion and end plates extending outwardly from said hub portion to form an annular chamber, a chamber ring comprising two semicircular ring sections disposed between said end plates and in running contact therewith, said chamber ring having an inlet port and an outlet port spaced apart the same distance as the ports in said casing, a division plate connecting said semi-circular ring sections between said inlet port and said outlet port, means for positioning the chamber ring relative to the casing with the inlet openings and the outlet openings of the cas ing and chamber ring in alinement, and vanes rotatably mounted in said rotor within the annular chamber and means for rotating said vanes.

12. In a hydraulic mechanism of the rotary type, a rotor having an annular recess forming the bottom and sides of a fluid chamber, a chamber ring comprising a pair of semi-circular ring sections extending into said recess in running sealing relationship with the sides of said fluid chamber, a division plate connecting said semicircular ring sections and extending into said fluid chamber, said chamber ring having a fluid inlet port on one side of said division plate and a fluid outlet port .on the other side of said division plate,

and a plurality of vanes rotatably mounted inv said rotor and extending across said chamber.

13. In hydraulic mechanism of the rotary type, a housing having fluid inlet and fluid outlet means, a shaft rotatably mounted in said housing, a rotor fixed on said shaft, said rotor having an annular peripheral fluid chamber therein, a plurality of vanes rotatably mounted in said rotor parallel to said shaft and extending across said chamber, a chamber ring extending into said chamber, a division plate secured to said chamber ring within said chamber, said chamber ring having a fluid inlet opening on one side of said:

division plate and a fluid outlet opening on the other side of said division plate, means for axially slidably securing said chamber ring in said housing, means connecting the fluid inlet means of said housing with the fluid inlet opening of the chamber ring and means connecting the fluid outlet means of said housing with the fluid outlet opening of said chamber ring.

14. In hydraulic apparatus of the rotary type having a cylindrical wall forming a working chamber and provided with circumferentially spaced inlet and outlet ports; a rotor mounted in said working chamber having an annular peripheral chamber in fluid communication with said ports; vanes movably mounted .in said rotor to traverse said annular rotor chamber; a division plat in said annular rotor chamber; a pair of semi-circular sealing chamber ring sections flxed to said division plate between the opposite side walls of said annular rotor chamber and in running contact with the inner faces thereof, said chamber ring sections having spaced openings thereinregistering with said inlet and outlet ports respectively; and means non-rotatably connecting said division plate to the wall of said working chamber between the inlet and outlet ports for movement with said rotor axially of the working chamber.

15. In hydraulic apparatus of the double acting rotary type; a, cylinder providing a working chamber with circumferentially spaced inlet and outlet ports in opposite sides of the cylinder wall; a rotor mounted in said chamber having an annular peripheral chamber in fluid communication with said ports and a plurality of relatively movable vanes mounted in said rotor to traverse said annular chamber; a pair of division plates adapted to be assembled in the annular rotor chamber at diametrically opposite sides of the rotor, said plates each having means slidably coacting with means internally formed on the cylinder Wall in the axial movement of the rotor to operative position within the cylinder to retain said division plates against circumferential displacement relative to the cylinder wall and rotor while permitting axial unitary movement of said plates with the rotor in the operative position of the rotor; and a pair of stationary ring sections in the rotor chamber each fixed at its 0pposite ends to the respective division plates and having openings therein registering with said inlet and outlet ports at opposite sides of the cylinder, said ring sections having running seal contact with opposite side walls of the rotor chamber and the'rotor vanes.

WALTER H. MARSH.

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

UNITED STATES PATENTS Number Name Date Re. 19,772 Dudley Dec. 3, 1935 298,952 Donkin May 20, 1884 1,279,913 Roberts Sept. 24, 1918 1,565,401 Schaeren Dec. 15, 1925 1,743,977 Petersen Jan. 14, 1930 2,136,066 Walters Nov. 8, 1938 2,202,911 Johnson June 4, 1940 2,274,206 Marsh Feb. 24, 1942 2,296,768 Cochran Sept. 22, 1942 2,508,356 Allsup May 23, 1950 FOREIGN PATENTS Number Country Date 83,755 Germany of 1895 219,902 Germany Sept. 1907

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