US2130299A

US2130299A - Radial pump

Info

Publication number: US2130299A
Application number: US63146A
Authority: US
Inventors: Ernst Walter
Original assignee: HYDRAULIC PRESS CORP Inc
Current assignee: HYDRAULIC PRESS Corp Inc
Priority date: 1936-02-10
Filing date: 1936-02-10
Publication date: 1938-09-13
Anticipated expiration: 1955-09-13

Description

Sept. 13, 1938.- w, ERNST 2,130,299

RADIAL PUMP Filed Feb. 10, 1936 3' Sheets-Sheet l INVENTOR lmzn'e ,se/vsr Sm +6MLM ATTORNEYS Sept. 13, 1938. w. ERNST 2,1 9

RADIAL PUMP Filed Feb. 10, 193 :5 sheets-sh et'z INVENTOR mu 7,52 ie/vsr.

BY Q SMJZW #JW 67 65' ATTORNEYS I Patented Sept. 13, 1938 UNITED, STATES PATENT OFFICE Walter Ernst, Mount Gilead, Ohio, asslgnor to The Hydraulic Press Corporation, Inc., Wilmington, Del., a corporation 01' Delaware Application February 10, 19.36, Serial No. 63,146

. v 12 Claims.

This invention relates to hydraulic pumps or motors, and in particular, to a hydraulic pump having radial pistons and cylinders. One object of this invention is to provide a hydraulic pump or motor having a primary rotor with radial cylinder bores, the pistons whereof engage segmental crosshead blocks, whichin turn, engage anti-friction bearing elements mounted in a shift ring surrounding the entire assembly.

Another object is to provide such a pump or motor, wherein the head of each piston is rounded and rests in a recess in the inner side of the guide block.

Another object is to provide a pump or motor of this description, wherein the segmentalguide blocks are spaced apart from one another and separately engage difierent anti-friction bearing elements disposed around the inner surface of the shift ring, the latter serving as an outer bearing race for the anti-friction bearing elements.

,Another object is to provide a hydraulic pump or motor, wherein the radial pistons reciprocating in a radially bored primary rotor have rounded ends resting in tapered recesses in the inner sides of segmental guide blocks so as to enable the pistons to rock back andforth in the tapered recesses, the outer sides of the guide blocks engaging roller'bearings held in place by a bearing race which is laterally movable to serve also as a shift ring to vary the eccentricity between the shift ring and the primary rotor,

and thereby to produce reciprocation of thepistons.

Another object is to provide a hydraulic pump or motor of the type previously described, wherein a second pump is coupled therewith to provide super-charging for the first-mentioned pump,'

charging pump taken along the line 2-2 of Figure 1.

Figure 3 is a top plan view of the pump assembly shown in Figure 1.

Figure 4 is a left-hand end elevation of the pumpassembly shown in Figures 1 and 3.

Figure 5 is an enlarged cross section through the pintle of the main pump, taken along the line 5-5 of Figure 1.

Figure 6 is a longitudinal, vertical section through the pump assembly shown in Figure 1, taken along the axis of the main drive shaft and pintle.

Figure 7 is a .transverse section through the 10 main pump, taken along the line 'l-'|' of Figure 6.

Figure 8 is a left-hand end elevation of the pintle shown in Figure 9.

Figure 9 is a side elevation, partly in section, of the pintle used in the radial or main pump of my invention.

Figure 10 is a right-hand end elevation of the pintle shown in Figure 9.

Figure 11 is a cross section through the pintle taken' along the line ll--H'of Figure 9.

Figure 12 is a side elevation of a complete assembly of piston crosshead guide blocks.

Figure 13 is a cross section along the line l3-i3 of Figure 12.

Figure 14 is a perspective view of a piston employed in the pump or motor of this invention.

Figure 15 is a perspective view of a modified form of piston, showing a wrist pin for retaining the piston'in engagement with its crosshead guide block. I 30 Figure 16 is an enlarged cross section taken along the axis of a piston, and showing the modified form of piston of Figure 15 secured to its crosshead guide block.

General construction and circuit 35 Referring to the drawings in detail, Figures 1 and 6 show the pump assembly of this invention as consisting of a main pump, generally desig hated it], on the left-hand side of the figures, 40 and a super-charging pump, generally designated ii, on the right-hand side thereof. The main pump is of the radial piston type. The supercharging pump may be of any suitable type, and is shown as a'gear pump. The two pumps are driven by a common drive shaft, and the supercharging pump supplies pressure to the main pump so that the pistons are maintained in engagement with their crosshead guide blocks even during the suction strokes thereof.

The inlet I? (Figure 3) from the source of fluid, such as a tank, is connected to the intake side of the super-charging pump H, from the outlet side of which the pipe idruns to the inlet side of themain pump it. A branch it offthe pipe is is 5 ton serving to shift the control device, for thepump and reduce its delivery when the outlet pressure exceeds a predetermined amount.

Main pump construction The main pump I0 is of the variable delivery radial piston type, and is contained within the

casing halves

20 and 2|, these being held together by the machine screws 22. The casing half 2| is supplied with a projecting portion 23, having a bore 24 which serves to support the pintle 25. The projecting portion 28 is provided with a threaded passage 26, serving as an outlet port and connected to the outlet pipe I1. A similar threaded passage 21 connects the opposite side of the projecting portion 28 with the inlet pipe IS. The

passages

26 and 21 lead inwardly so as to communicate with the

ducts

28 and 29. respectively, leading to the outlet and inlet passages 20 and II of the pintle 25. From the threaded passage 22 the branch passage is leads tothe pilot line II. as shown in Figure 5. The outlet and inlet passages 20 and SI lead to the transverse ducts 22- and 22, opening into the

cutaway portions

24 and 25 near the mid-portion of the pintle. By this means fluid is conducted to and from the cylinders of the pump, as hereinafter explained.

Immediately adjacent the

cutaway portions

24 and 25 the pintle 25 is provided with an enlarged portion 28. Immediately beyond the latter is a "portion 21 which is substantially the same diameter as the pintle portion 28 supported in the end projecting part 23 of the casing half 2|. The

pintle terminates .at its right-hand end in a threaded portion 22. Surrounding the

pintle portions

21 and 82, respectively, are the inner races 40 and ll of

tapered roller bearings

42 and 42, the outer races 44 and 4! of which are mounted in depressions l2 and 41 in the opposite ends of a cylinder barrel or primary rotor 42. The latter at,

its central portion closely surrounds thevpintle portion 82, and is provided with radial cylinder bores 42 communicating with the

cutaway portions

24 and 2! of the pintle 2!, and having pistons ll reciprocabie therein.

The pistons 52 are provided with rounded outer ends II which are adapted to serve as crossheads enlailnl the segmental crosshead guide blocks. 52 in the tapered recesses 62 thereof (Figures i2 and '13). An arcuate groove l4 traverses each segmental guide block from one end to the other. The peripheral surface ll of each segmental guide block l2 is rounded, or otherwise relieved at its ends so as to provide for the easy motion of the guide blocks 82 as they move to and fro during the operation of the pump or motor. The cylinder barrel 42 is provided with a series of segmental ridges 56, extending between the cylinder ,bores 49 and adapted to provide additional support for the pistons I0 during their reciprocation. The grooves 84 in the guide blocks I2 are provided to enable the guide blocks to pass easily over the ridges 58-, as shown in Figure 6.

The .peripheral surfaces ll of the segmental guide blocks I2 engage anti-friction bearing elements, such as .the rollers 51, these (in turn, engaging the inner surface 58 of, the shift ring 59, the latter serving as an outer bearing race. The rollers 51 are maintained in position by retaining rings 60 resting in the recesses Si in the shift ring 59, and having annular grooves 82 engaging the corresponding projections 83 on the ends of the rollers 51. At the top andbottom thereof the shift ring 59 is provided with flattened portions 84 and 65, respectively engaging the corresponding

flattened portions

86 and, 61 of the casing half 2i. A the opposite ends of its horizontal diameter the shift ring 59 is provided with

fiattened portions

68 and 69. 'The ,fiattened portion 88 is engaged by a coil spring 10, mounted in a boss 1|, having a threaded bore 12 closed by a threaded adjusting plug 13. By varying the position of the plug 13in the threaded bore 12 the tension of the spring 10 is adjusted. The flattened portion 89, however, isengaged by one end.

of a pilot piston 14, reciprocating in a cylinder bore 15 in a boss 18 of the casing half 2|. The cylinder bore 15 is provided with a threaded outlet port", in which is secured the end of the pilot line It leading from the pressure outlet side of the pump.

The threaded portion 22, at the inner end of the pintle 2!, is provided with a nut 1| and a lockwasher 12 adapted to engage the inner race 40 of the tapered roller bearing 42. A keyway I! is also provided in the threaded end portion is,

and extends into the pintle portion 81. A key (not shown) within the keyway 80 engages a corresponding slot in the loclrwasher 19 and prevents it from rotating, and at the same time the ear extending from the lockwasher 19 engages one of the flat sides of the nut 18 and prevents the rotation of the latter. The opposite or outer end of the pintle 25 is similarly provided with a threaded portion", having a keyway '22 therein. A key within the keyway 22 engages a corresponding slot in the lockwasher l5 and prevents the lockwasher from turning, whereas the ear on the lockwasher engages the flat side of the nut 22, threaded upon the threaded portion s2, and prevents the rotation of the nut.

Ky turning the nut with the lockwasher ll released, the pintle 2! may be made to move longitudinally to adjust the clearances of the tapered roller bearings 42 and-ll. When, for

. example, the pintle 2I,is moved to the left, the

nut 12 and its lockwasher 1. push the inner race 40 against the rollers 42, and the latter push the outer race I and the cylinder barrel 42 to the left; This action closes the clearances existingbetween the rollers 42 and the inner and outer bearing races II and ll, the inner bearing 7 race ll being kept from moving by its engagement with the inner wall of the casing half 2|. After this adjustment is made the lockwasher ll may v be bentto lock the nut 22 in the position of adjustment. The casing half 22 of the main pump II is provided with a recess 21 in which is mounted the'outer race ll of a ball bearing I,

the inner race so of which is mountedupon the enlargement ll of the drive shaft 9:. The latter is provided with a further enlarged portion 22, which is secured to the cylinder barrel 0 by means of the screws 04 (Figure 6).

P I'Y-charginfl P mp pair of end plates ll and s2, spaced apart from -threaded plugs I06, I01, I08 and I09 (Figure 6).

The outer end of the stub shaft I03 extends into the socket H0 in the threaded plug 109, whereas the main drive shaft 92 passes through the threaded plug I01. The end plate 95 of the I super-charging pump II is joined to the casing respectively.

half as of the main pump it by means of the machine bolts Hi. i

The dowel pins i i2 assist. in maintaining accurate alignment between the

end plates

95 and 98 and the spacing ring 97 (Figure 6). The

spacingring 91 is provided'with an intake passage H3 and an outlet passage H4, these terminating in the junction members Band 6, secured to the opposite sides of the spacing ring 9! by the machine screws iii. The junction members H5 and iii are provided with threaded bores H8 and H 9, adapted to receive the threaded ends of the intake and outlet pipes i2 and i3,

The modified construction shown in Figure 16 is similar to that shown in Figure 6', except that a pin I20 passes through a transverse hole 52! in the crosshead guide block 52, and likewise passes through, a hole 122 in the piston 50. Consequently, by this construction the pisconnection.

Operation In the operation of the pump assembly of this invention, power is appliedto the drive shaft 92 from any convenient source, such as an electric motor. The rotation of the drive shaft 92 causes the rotation of the pump gears 99 and I00, and in turn, causes fluid to bedrawn from the tank (not shown) through the intake line i2, and discharged through the outlet line it. The fluid passes from the outlet line I! of the super-charging pump il into the inlet passage 21 of the main pump i0, thence through the pintle passage 3| and the cutaway portion 35, into the various cylinder bores 69 as these present themselves opposite the cutaway portion 35.

When theshift ring 59 is moved laterally so that its axis is eccentric to that of the pintle 25, the pistons'5li reciprocate in their cylinder bores when the rotation of the drive shaft ,92 rotates the primary rotor or cylinder barrel 58. As the pistons reciprocate their rounded ends 5| engage the tapered recesses 53 in the segmental guide blocks 52, and the latter will 'move in an annular path with their peripheral surfaces 55 engaging the rollers 5?, approaching the center of the pump during one-half of the revolution and receding during the other half. The pressure from the branch line 14 through the relief valve l5, into the discharge line l6, and thence bac tothe tank.

The reciprocation of the pistons 50 within the main pump I 0 in this manner causes pressure fluid to be discharged from the outlet line Il' thereof, and this fluid passes onward to the machinery or circuit which it is intended to operate. If thefluid pressure rises beyond a predetermined point, the fluid reaching the pilot cylinder 15 through the branch line l8 acts upon the pilot piston 14 (Figure 7), urgingit to the left and with it the shift ring 59, thereby overcoming the thrust of the coil spring 10. This action tends to return the shift ring 59 to its neutral position and reduce the discharge of the pump.

It will Ice-understood that I desire to comprehend within my invention such modifications as come within the scope of the claims and the invention.

Having thus fully described my invention,

what I claim as new and desire to secure by Let- 'means for supplying pressure fluid tothe pistons in said cylinder bores to maintain them in said contacting engagement with said guide blocks during the suction strokes thereof.

2. A pump assembly comprising a casing, a

pintle, a cylinder. barrel with radial cylinder bores, pistons reciprocable therein, segmental guide blocks adapted to have contacting engagement with the outer ends of the pistons, a shift member,anti-friction bearing elements arranged between said shift member and said guide blocks, said anti-friction bearing elements being secured to said shift member in an annular path therearound and having their inner portions exposed for direct-engagement by said guide blocks, and an auxiliary pump adapted to supply pressure fluid to the pistons to maintain them in said contacting engagement with the guide blocksduring the suction strokes thereof. L

3. A fluid pressure pump or motor comprising a'cylinder barrel having cylinder bores, pistons reciprocable therein, a segmental guide block for each piston, a shift member, and anti-friction bearing elements directly engaged by and ar-. ranged between said guide blocks and said shift member, said anti-friction. bearing elements being secured to said shift member in an annular path therearound and having their inner portions exposed for direct engagement by said guide blocks. I

4. A fluid pressure pump or motor comprising a cylinder barrel having cylinder bores, "pistons reciprocable therein, a segmental guide block for each piston, a shift member, and anti-friction bearing elements directly engaged by and arranged between said guide blocks' and said shift member, said anti-friction bearing elements being secured to said shift member in an annular path therearound' and having their inner portions exposed for direct engagement by said guide blocks, said-pistons having rounded ends and said guide blocks having recesses adapted to receive said rounded ends.

5. A fluid pressure pump or motor comprising acylinder barrel having cylinder bores, pistons reciprocable therein, a segmental guide blmk for each piston,'a shift member, and anti-friction bearing elements directly engaged by and arranged between said guide blocks and said shift member, said anti-friction bearing elements being secured to said shift member in an annular path therearound and having their inner portions exposed for direct engagement by said guide.

blocks, said' pistons having contacting engagement with said guide blocks, and means for supplying pressure fluid to said pistons to maintain said pistons against said guide blocks and said guide blocks against said bearing elements during the suction stroke. a

6. A fluid pressure pump or motor comprising a cylinder barrel having cylinder bores, pistons reciprocable therein, a segmental guide block for each piston, a shift member, and anti-friction bearing elements directly engaged by and arranged between said guidebloclrs and said shift member, said anti-friction bearing elements being secured to said shift member in an annular path therearound and having their inner portions exposed for direct engagement by said guide blocks, said segmental guide blocks being spaced apart from each other in a circumferential d1? rection. 4

7. A fluid pressure pump or motor comprising a cylinder barrel having cylinder bores, pistons reclprocable therein, a segmental guide block for.

each piston, a shift member, anti-frictionbearing elements directly engaged by and arranged between said guide blocks and said shift member, said anti-friction bearing elements being secured to said shift member in an annular path there-- around and having their inner portions exposed for-direct engagement by said guide blocks, and means for retaining said bearing elements in association with said shift member.

8. A fluid pressure pump or motor comprising a cylinder barrel having cylinder bores, pistons reciprocable therein, a segmental guide block for each piston, a shift member, anti-friction bearing elements directly engaged by and arranged between said guide blocks and said shift member, said anti-friction bearing'elements being secured to said shift member in an annular path therearound and having their inner portions'exposed for direct engagement by said guide blocks, and retaining members secured to said shift member to retain said bearing elements in association therewith. I

9. A fluid pressure pump or motor comprising a casing. a pintle therein, a cylinder barrel rotatably supported on said pintle, pistons reciprocable radially in said cylinder barrel, each piston having an outwardly disposed head, a shift member with orbitally disposed anti-friction bearing elements, and segmental guide blocks arranged between and directly engflins said bearing elements and said piston heads, said anti-friction bearing elements b01 8 secured to said shift member in an annular path with the outer portions thereof ensaging said shift member and with the inner portions thereof exposed for direct engagement by said guide blocks.

10. A fluid pressure pump or motor comprising a casing, a pintle therein, a cylinder barrel rotatably supported on said .pintle, pistons reciprocable radially in said cylinder barrel, each piston having a rounded head, a shift member with orbitally disposed anti-friction bearing elements, and segmental guide blocks arranged between and directly engaging said bearing elements and said piston heads, said anti-friction bearing elements being secured to said shift member in an annu-.

lar path with the outer portions thereof engaging said shift member and with the inner portions thereof exposed for direct engagement by said guide blocks, said segmental guide blocks 11. A fluid pressure pump or motor comprising a casing, a pintle therein, a cylinder barrel rotatablysupported on said pintle, pistons reciprocable radially in said cylinder barrel, each piston having an outwardly disposed head, a shift member supported by said casing for lateral movement relatively to said pintle, anti-friction bearing elements carried by. said shift member, and segmental guide blocks arranged between and directly engaging said bearing elements and saidpiston heads, said anti-friction bearing elements being secured to said shift member in an annular path with the outer portions thereof engaging said shift member and with the inner portions thereof exposed for direct engagement bysaid guide blocks. F

12. A fluid pressure pump or motor comprising a casing, a pintle therein, a cylinder barrel rotatably supported on said pintle, pistons reciprocable radially in said cylinder barrel, each piston having an outwardly dbpoeed head, a shift member supported by said casing for lateral movement relatively to said pintle, anti-friction bearing elements carried by said shift member, segmental guide blocks arranged between and directly enusing said bearing elementseand said piston heads, said anti-friction bearing elements being secured to said shift member in an annular path with the outer portions-thereof engaging said shift member and with the inner portions thereof exposed for direct engagement by said guide blocks, and retaining means secured to said shift ring to maintain said bearing elements in asso ciation therewith.

' WALTER IRNB'I.

having recesses arranged to receive said rounded piston heads.