US2565208A

US2565208A - Pump

Info

Publication number: US2565208A
Application number: US640655A
Authority: US
Inventors: John D Dietiker
Original assignee: Vickers Inc
Current assignee: Vickers Inc
Priority date: 1946-01-11
Filing date: 1946-01-11
Publication date: 1951-08-21
Anticipated expiration: 1968-08-21

Description

Aug. 21, 1951 Filed Jan. 11, 1946 J. D. DIETIKER PUMP Fig]

4 Sheets-Sheet 1 INVENTOR. JOHN D. DIETIKER ATTORNEY A 21, 1 51 J. D. MHKER- 2,56 08 PUMP Filed Jan. 11, 1946 4 Sheets-Sheet 2 INVEN TOR. JOHN D. DIETIKER WXZW ATTORNEY J. D. DIETIKER Aug. 21, 1951 PUMP Filed Jan. 11, 1946 4 Sheets-Sheet 5 INVENTOR. JOHN D. DIETIKER ATTORNEY 21, 1951 J. D. DIETIKER 2,565,208

' PUMP Filed Jan. 11, 1946 4 Sheets-Sheet 4 INVENTOR. J OH N D. DIETIKER BY A ATTORNEY Patented Aug. 21, '1951 PUMP - John D. Dietiker, Detroit, Mich., assignor to -V1ckers Incorporated, Detroit, Mich., a corporation of Michigan Application January 11,1946, Serial No. 640,655

7 Claims. (Cl. 103-462) This invention relates to power transmissions, particularly to those of the type comprising two or more fluid pressure energy translating devices, one of which may function as a pump and another as a fluid motor. I

The present invention is particularly concerned with fluid pressure energy translating devices of the axial piston type having a swinging two-arm yoke member for varying the displacement of the device.

In the past it has been customary to pivotally journal the yoke arms within the casing member upon some stationary form of pintle construction also connected to the casing member. It has also been the practice to connect inlet and outlet flanges in line with the pintles which extend beyond the housing, resulting in increasing the width of the pump at the pintles. This arrangement is found to be inadequate for certain installations and, even where found adequate, when it became necessary to remove the pintle assembly for inspection or maintenance, the type of pintle assembly construction used combined with the constructional arrangement of the inlet and outlet flanges proved to be cumbersome.

It is an object of the present invention, therefore, to provide an improved pump or motor construction of the axial piston type having a swinging yoke for varying the displacement of the device wherein the width of the device is decreased at the pintles with consequent reduction in the weight and size of the pump.

It is also an object of the present invention to provide in pumps and motors of this general class a pintle assembly for pivotally connecting the yoke arms within the casing member of such a construction as to be in cartridge form easily insertable in and removable from the casing and yoke and, once removed, easily disassembled and reassembled.

It is a further object of the present invention to provide a pump or motor of this general class of improved and more rugged, compact and reliable construction capable of satisfactory operation over a long and useful life at extremely high pressures and high speeds.

Further objects and advantages of the present invention will be apparent from the following description, reference being had to the accompanying drawings wherein a preferred form of the present invention is clearly shown.

In the drawings:

Figure 1 is a longitudinal cross section of a fluid pressure energy translating device embodying a preferred form of the present invention.

Figure 2 is a plan view of the invention shown in Figure 1.

Figure 3 is a sectional view taken on line 3-3 of Figure 2.

Figure 4 is a sectional view of a portion of the invention shown in Figure 1. t

Figure 5 is a view of the valve plate incorporated in Figure 1.

Figure 6 is a partial sectional view of the valve plate shown in Figure 5 shown from the opposite side.

Figure 7 is a view taken on line 1-1 of Figure 5.

' Figure 8 is a view taken on line 8-8 of Figure 2.

Figure 9 is a broken sectional end view of the invention shown in Figure 1.

Referring now to Figure 1, there is illustrated a pump of the variable displacement type comprising generally a main frame or casing member' l0 having flange means 12 for attachment to a suitable support. The casing I0 is pro vided with radial anti-friction and thrust bearings l4 on which a main drive shaft I8 is journalled. A seal for the projecting end of the shaft I6 is provided for by a closure member 18. The shaft I6 is provided with a socket flange 20 carrying a plurality of ball sockets 22 in which are mounted ball-ended connecting rods 24 carrying reciprocating pistons 26.

The casing I0 is provided with two inwardlyprojecting tongues 28 and 30 having similar bores 32 and 34 in alignment, respectively, with similar bores 36 and 38 formed in the side walls of the casing member I 0. An inlet passage 39 is formed in the side walls of the housing Ill which extends from the end of said housing opposite the shaft 16 laterally to bore 36, while a similar outlet passage 4| extends from the same end of the housing to bore 38. An inlet flange 43 and an outlet flange 45 registering with passages 39 and 4|, respectively, are mounted on casing ID by suitable bolts 41.

A yoke 40, to which is rigidly attached a valve plate 42 and which is provided with

duplicate arms

44 and 46 having similar bores 48 and 50, respectively, is pivotally connected by the

arms

44 and 46 within the casing member ID by means hereinafter described in such a manner that the yoke bores 48 and 50 are in alignment, respectively, with the casing bores 36 and 38.

A cylinder barrel 52, having a plurality of cylinder bores 54 in which the pistons 26 are reciprocable, is journalled on a ball bearing 56 carried by a stud 58 which is rigidly secured to the valve plate 42 by means of a suitable bolt 59 threaded into the stud 58 and a pin Bl driven through the shaft and fitting into a slot 63 of within bore II4.

the valve plate 42, as is shown more clearly in Figure 5. Each cylinder bore 54 is provided with a cylinder port 60 opening to the bottom face of the barrel 52, in Figure 1, which are adapted to cooperate with a kidney-shaped intake port 62 in the valve plate 42 on the suction stroke of pistons 26 and with a similarly-shaped output port 64 therein adjacent port 62 on the pressure stroke of said pistons as the barrel 52 is rotated. The barrel 52 for this purpose is driven from the shaft I6 through the medium of a Cardan shaft 66 having universal joints 68. A coupling shaft I0, which is splined to match the drive shaft I6, is provided for driving the pump. A light spring TI urges the shaft 66 downwardly to take up any lost motion in the axial direction inherent in the universal joints 68. Another light spring I3 mounted on the shaft 58 tends to aid in urging proper contact between the opposite faces of the cylinder barrel 52 and the valve plate 42. I

As is more clearly shown in Figures 5, 6 and '7, the valve plate 42, which is rigidl secured to the yoke 40 by suitable bolts placed through mounting holes I2 provided for that purpose, contains two parallel longitudinal bores I4 and I6, both of which are in communication with intake and

output ports

62 and 64. The valve plate 42 also is provided with two transverse ports I8 and 80 adjacent to each other located between one end of the valve plate 42 and intake port 62, the former being in communication with bore I4 and the latter with bore I6. In addition, two similar

transverse ports

82 and 84 are located between the opposite end of valve plate 42 and output port 64, the former being in communication with bore I4 and the latter with bore "I6. Two suitable relief valve assemblies 86 and 88 are mounted inversely to each other in bores I4 and I6, and the bores are closed at each end by suitable plugs 90.

As shown in Figure 1, transverse ports I8 and 80 register with duplicate passages 92 in the yoke body, one only of which is shown in dotted lines, which extend into the arm 44 of said yoke and finally communicate with bore 48. Likewise,

transverse ports

82 and 84 register with duplicate passages 94 in the yoke body, one only of which is shown in dotted lines, which extend into the other arm 46 of said yoke and finally communicate with bore 50.

Due to the fact that the methods of pivotally connecting the

arms

44 and 46 within the casing member I are identical, an explanation of connecting one of said arms will suflice.

The bore 48 of arm 44 is provided with a sleeve 96 having a shoulder 98 resting on a shoulder I00 within bore 48 and is locked into arm 44 by means of a pin IOI. An additional sleeve I02 having a plurality of ports I04 and a shoulder I06 is also inserted in bore 48 with shoulder I06 resting on shoulder I00 and abutting shoulder 98 of sleeve 96. When '50 inserted, ports I04 register with the yoke arm passages 92. A pintle assembly I08, shown in Figure 4, is then inserted within bore 48 and within sleeves 96 and I02 with the assembly I08 being held within said bore and sleeves by use of a snap ring IIO.

As is shown in Figure 4, pintle assembly I08 comprises a cylindrical pintle H2 having a longitudinal bore I I4 closed at its open end by means of a plug II6 which may be hydrogen-brazed Pintle I I2 is provided with a plurality of ports II8 intersecting bore II4 adapted to register with ports I04 of sleeve I02 and with a plurality of ports I20 also intersecting bore II4 adapted to register with a plurality of ports I22 in a sleeve I24 surrounding the upper periphery of pintle H2, in Figure 4. Duplicate split-type expansion seals I26 and I28 surround pintle II2, although other suitable seals may be used, and are spaced apart by means of a light spring I30 so that ring seal I26 abuts the upper side of a flange I32 on pintle H2 and seal I28 abuts the inner end of sleeve I24. Suitable seals I33 and I35 surround the outer periphery of sleeve I24 above and below ports I22, and a suitable seal I3I is provided for pintle H2 adjacent to seal I33. A loose-fitting pin I34 and a snap ring I36 securely lock the members of the assembly in assembled position.

It should be noted that, by providing a separate sleeve for and forming a flange on the pintle I I2, proper abutment members are automatically provided for the duplicate sealing rings I26 and I28 which, together with the spring I30, become an integral part of the cartridge upon assembly. When assembling, the cartridge seals I26 and I28 spaced apart by spring I30 may be mounted on the pintle II2 with seal I26 abutting the upperside of flange I32. When sleeve I24 is positioned upon pintle H2 and connected thereto by means of loose-fitting pin I34 and snap ring I36 so that ports I20 and I22 of pintle H2 and sleeve I24, respectively, register with each other, the inner extremity of sleeve I24 forms an abutment for ring seal I28. With the pintle and sleeve thus connected, spring I30 not only properly spaces apart the seals I26 and I28 above and below ports I I8 permitting communication between ports I I8 and ports I04 of sleeve I02, but also holds the same in abutment against flange I32 and the inner end of sleeve I24.

A threaded bore I38 is provided at the closed end of pintle II2 for convenience in threading a proper tool therein for easy removal of the complete assembly I08 simply by removing snap ring IIO. Once the assembly I08 is removed, it may be easily disassembled simply by removing pin I34, shifting sleeve I24 against the slight resistance offered by spring I30 and removing snap ring I36. The point of insertion of assembly I08 is limited by a shoulder I40 of sleeve I24 forming an abutment against a shoulder I42 formed within bore 36 of casing I0.

A hearing I44, resting on the flange I 32 of pintle H2 and shoulders 98 and I06 of sleeves 96 and I02, respectively, and abutting the outer periphery of pintle H2 and the inner periphery of sleeve 96, provides for proper pivotal bearing movement of yoke 40.

Referring now to Figures 1, 5 and 6, pintle assembly I08 serves to pivotally connect the yoke 40 within the casing member I0 in such a manner that fluid will be conducted on the suction stroke of pistons 26 through inlet passage 39 and ports I22 and I20 of sleeve I24 and pintle II2, respectively, to bore II4 of pintle II2. From bore I I4, fluid is conducted through ports I I8 and I04 of pintle H2 and sleeve I02, respectively, and by means of yoke passages 92 to ports I8 and of valve plate 42 and within such valve plate to bores I4 and I6.

The resistance offered by relief valve 88 and the fact that the flow is blocked in the opposite direction by relief valve 86 prevents fluid from entering

ports

82 and 84 and fluid enters the cylinder bores 54 containing the pistons 26 acting on the suction stroke by means of intake port 62 in valve plate 42. As the barrel 52 rotates,

the fluid is forced out of bores 54 on the pressure stroke of pistons 26 to bores I4 and 16 of valve plate 42 by means of output pqrt 64 Where, inversely, the resistance offered by relief valve 86 and the blocking of fluid flow 'btprelief valve 88 prevents fluid from flowing through ports I8 and 80. Pressure fluid is then conducted by means of

ports

82 and 84 of plate 42 to yoke passages 94 which register therewith and by means of pas sages 94 to bore H4 of the opposite pintle II2 by means of corresponding ports I04 and H8, respectively, in the corresponding sleeve I02 and pintle II2. through corresponding ports I20 and I22, respectively, of corresponding pintle H2 and sleeve I02 to outlet passage 4| and thence to outlet 45.

In order to vary the volume of fluid according to pressure requirements. suitable means may be provided to automatically regulate the movement of the yoke which in turn changes the angle between the cylinder barrel and the main drive shaft.

As is more clearly shown in Figures 3, 8 and 9, a pressure control body I46, containing suitable pressure control mechanisms, not shown, is mounted on casing member I between inlet flange 43 and outlet flange 45. Pressure control body I46 has a portion I48 extending into a bore I50. Portion I48 may contain suitable pressure responsive mechanism I52 linked to yoke 40 capable of shifting the angle of. yoke 40 toward the neutral position after a. predetermined pressure has been reached.

As is more clearly shown in Figures 3 and 9, at the end of casing member I0 on which control body I46 is mounted, a passage I54 extends completely through casing member I0 and is closed by suitable plugs I56. Duplicate passages I58 and I60 are provided which extend from the end of casing member I8, passage I58 communieating directly with passage I54 and inlet passage 39, while passage I60 communicates directly with passage I54 and outlet passage 4'. Another passage IE2 is connected to passage I54 and is adapted to register with ports, not shown. in control body I46. Duplicate check valves I63 and IE4 are mounted in passages I58 and I60 for permitting the pressure controlling mechanism to be effective in either direction of rotation of shaft I6. The inverse mounting of the relief valves 86 and 88 makes the valve plate porting immediately adaptable without any change to this reversal of rotation of shaft I6, while check valves I52 and I64 permit the pressure regulating mechanism to be equally effective for shifting the yoke in case of such reversal of rotation.

It should be noted that the placing of the inlet and outlet flanges at the end of the casing member does not in any way increase the length of the pump because of the fact that the pressure control body mounted on the casing member extends out to a distance equal to the extended distance of the inlet and outlet flanges. The placing of these flanges at the end of the pump does, however, greatly reduce the width of the pump at the pintles.

It should also be noted that the pintle assembly is completely removable from the casing member and the arms of the yoke simply by threading a proper pintle removal tool in the bore provided for that purpose and removing the snap ring fitting into a groove in the casing. Also it is important to not that, upon removal of the From bore II4, fluid is conducted complete assembly, it is a simple matter to disassemble and reassemble the same.

It should also be noted that, because of the inverse mounting the duplicate relief valves in the valve plate, the device is readily adaptable for reverse rotation of the drive shaft simply by rearranging the inlet and outlet flanges. In addition, the pressure regulating mechanism which changes the angle of the yoke toward a neutral position after a certain range of pressure has been reached is readily adaptable without any changes in the device for reverse rotation of the pump. This immediate adaptation to reverse rotation of the device is made possible by use of the novel mounting arrangement of the duplicate check valves which permits pressure fluid being delivered by the pump on the pressure stroke of the pistons, no matter what the direction of rotation of the main drive shaft, to enter the pressure control body from the casing conduit being used as an outlet and preventing reverse flow through the casing conduit being used as an inlet passage.

While the form of embodiment of the invention as herein disclosed constitutes a preferred form, it is to be understood that other forms might be adopted, all coming Within the scope of the claims which follow.

What is claimed is as follows:

1. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device including inlet and outlet connections, a two-armed swinging yoke having inlet and outlet passages formed in its arms, means for transferring fluid from the inlet passage to the outlet passages, hollow pintle bearing means associated with the casing and with said arms to provide a pivot for the yoke and to conduct fluid into and out of said passages, said pintle means being located for removal from the casing without disturbing the inlet and outlet connections, and means including fluid conduits extendingtransversely to the axis of said pintle bearing means at a point closely adjacent the yoke arms for carrying fluid between the hollow pintle bearing means and the inlet and outlet connections.

2. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device including inlet and outlet connections, a two-armed swinging yoke having inlet and outlet passages formed in its arms, means for transferring fluid from the inlet passage to the outlet passage, a unitary pintle cartridge assembly having sealing means formed as an integral part thereof associated with the casing and with said arms to provide a pivot for the yoke and to conduct fluid into and out of said passages, said cartridge assembly being located for removal from the casing without disturbing the inlet and outlet connections, and means including fluid conduits extending transversely to the axis of said pintle cartridge at a point closely adjacent the yoke arms for carry-- ing fluid between the pintle cartridge and the inlet and outlet connections.

3. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device including inlet and outlet connections, a two-armed swinging yoke having inlet and outlet passages formed in its arms, means for transferring fluid from the inlet passage to the outlet passage, a unitary pintle cartridge assembly having an internal cylindrical cavity mounted in the casing and proamazes viding journals within the casing upon which the yoke arms are pivotally mountable, said cartridge assembly being located for removal from the oasing without disturbing the inlet and outlet cannections, means including fluid conduits extending transversely to the axis of said cartridge assembly at a point closely adjacent the yoke arms, and a plurality of ports in said cartridge in communication with said cavity registering with the yoke passages and with the casing fluid conduits for carrying fluid from the inlet connection to the yoke and from the yoke to the outlet connection.

4. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device having a removable access cover, a two-armed swinging yoke having inlet and outlet passages formed in its arms, means for transferring fluid from the inlet passage to the outlet passage, hollow pintle bearing means associated with the casing and with said arms to provide a pivot for the yoke and to conduct fluid into and out of said passages, inlet and outlet connections formed in the casing, and means including fluid conduits extending to said pintle bearing means at a point closely adjacent the yoke arms for carrying fluid between the hollow pintle bearing means and the inlet and outlet connections, said pintles being removable from the exterior of the casing without disturbing the inlet and outlet connections whereby the yoke may be removed from the casing upon removal of the access cover while the inlet and outlet connections remain connected.

5. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device, inlet and outlet connections formed therein, means forming a pair of duplicate bores in said casing, duplicate conduits extending from said connections to the bores, a two-armed swinging yoke, inlet and outlet ports formed therein, means for transferring fluid from the inlet port to the outlet port, means forming a bore in each arm adapted to register with the casing bores, inlet and outlet passages in said arms extending from the yoke inlet and outlet ports to the yoke bores, cylindrical pintle bearing means having an internal cavity stationarily mountable within the casing bores and extending into the yoke arm bores providing a pivot therefor, a first plurality of ports in said pintle means intersecting said cavity and registering with the casing inlet and outlet conduits for conducting fluid from the inlet connection to the pintle cavity and from the pintle cavity to the outlet connection, and a second plurality of ports in said pintle means also intersecting the cavity and registering with the yoke arm inlet and outlet passages for carrying fluid to and from the cavity and the yoke inlet and outlet ports.

6. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device, inlet and outlet connections formed in one end of the casing, means forming a pair of duplicate bores in the sides of said casing, a two-armed swinging yoke, inlet and outlet ports formed therein, means for transferring fluid from the inlet port to the outlet port. means forming a bore in each arm adapted to register with the casing bores, inlet and outlet passages in said arms extending from the yoke inlet and outlet ports to the yoke bores, cylindrical pintle bearing means having an internal cavity stationarily mountable within the casing bores and extending into the yoke arm bores providing a pivot therefor, duplicate conduits connected to the casing inlet and outlet connections and extending laterally in the side walls of the casing to the casing bores at a, point closely adjacent the yoke arms, a first plurality of ports in said pintle means intersecting said cavity and registering with the casing inlet and outlet conduits for conducting fluid from the inlet connection to the pintle cavity and from the pintle cavity to the outlet connection, and a second plurality of ports in said pintle means also intersecting the cavity and registering with the yoke arm inlet and outlet passages for carrying fluid to and from the cavity and the yoke inlet and outlet ports.

7. In a fluid pressure energy translating device of the variable displacement type, the combination of a casing for the device including inlet and outlet connections, a two-armed swinging yoke having inlet and outlet passages formed in its arms, means for transferring fluid from the inlet passage to the outlet passage, pintle hearing means mounted within the casing and providing journals upon which the yoke arms are pivotally connected, said pintle bearing means being located for removal from the casing without disturbing the inlet and outlet connections, said pintle bearing means having an internal cylindrical cavity and a first plurality of ports and a second plurality of ports in communication with the cavity, said first plurality of ports registering with the yoke arm inlet and outlet passages for conducting fluid between the pintle REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 372,069 Home Oct. 25, 1887 1,835,877 Joyce Dec. 8, 1931 2,155,460 Wishart Apr. 25, 1939 2,277,570 Vickers Mar. 24, 1942 2,288,768 Zimmerman July 7, 1942 2,313,407 Vickers Mar. 9, 1943