US3667868A - Radial piston pump - Google Patents

Radial piston pump Download PDF

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Publication number
US3667868A
US3667868A US8681A US3667868DA US3667868A US 3667868 A US3667868 A US 3667868A US 8681 A US8681 A US 8681A US 3667868D A US3667868D A US 3667868DA US 3667868 A US3667868 A US 3667868A
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United States
Prior art keywords
pump
base plate
radial piston
cylinder blocks
casing
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Expired - Lifetime
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US8681A
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English (en)
Inventor
Rudolf Brunner
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Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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Priority claimed from DE19691906773 external-priority patent/DE1906773A1/de
Application filed by Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG filed Critical Heilmeier and Weinlein Fabrik fuer Oel Hydraulik GmbH and Co KG
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/053—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders
    • F04B1/0536—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement with actuating or actuated elements at the inner ends of the cylinders with two or more serially arranged radial piston-cylinder units
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
    • F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
    • F04B1/0404—Details or component parts

Definitions

  • L l -i I n 8 i n may :Q h
  • radial piston pumps the cylinder blocks are arranged in asterisk shape around an eccentric shaft and the pistons disposed in the cylinders are actuated in the direction of their working stroke by cams positioned on the eccentric shaft while they are returned under the force of springs or by positive guidance.
  • the expression asterisk shape is to include also the extreme case of radical arrangement of a single cylinder block at the eccentric shaft although, as a rule, three, five, or seven cylinder blocks will be distributed around the circumference of the eccentric shaft to form a star with the eccentric shaft having three, five, or as well.
  • Such an astrisk arrangement constitutes a row of cylinder blocks distributed around the circumference of the eccentric shaft.
  • a multiple-row radial piston pump the only type with which the present invention is concerned, comprises a plurality of such stars or rows arranged successively on the eccentric shaft.
  • the cylinder blocks of such a radial piston pump are arranged within the pump casing in a bath of the hydraulic medium.
  • the pump casing accordingly, is provided with a suction opening for the hydraulic medium.
  • the invention relates to a radial piston pump of the type described above wherein a first row of cylinder blocks arranged in asterisk shape about a common eccentric shaft at one side of a base plate provided with an outlet manifold and a second row of cylinder blocks arranged in asterisk shape about the eccentric shaft at the other side of said base plate are disposed between two pump casing halves, in each of which the eccentric shaft is supported and which together form a pump casing enclosing also the base plate and being filled with a hydraulic medium, a high pressure pipe connected to the outlet manifold of the base plate passing through said pump casing to the outside.
  • the base plate is made of steel or a similar high pressure resistant material
  • the pump body or casing consists of a pressure casting or is made of another less pressure resistant material, including plastic material.
  • One suction opening in one half of the pump casing is suflicient if the bath of the hydraulic medium communicates across the base plate through a corresponding passage or aperture in the base plate.
  • the invention provides that the two pump casing halves of the pump structure as described above are clamped against each other axially by means of clamping bolts and that the rows of cylinder blocks and the associated base plate are sandwiched on the clamping bolts and clamped together axially between the two halves of the pump casing.
  • multiple-row radial piston pumps may be constructed by arranging several two-row assemblies successively on the clamping bolts, each of the assemblies being composed of a first asterisk-shaped row of cylinder blocks, a base plate, and a second asteriskshaped row of cylinder blocks, all being clamped together by the two pump casing halves.
  • the interior surface of the circumference of the pump casing formed by the two casing halves may even be spaced from the cylinder blocks and from each base plate.
  • both pump casing halves to be clamped together without any positive centralizing means and by merely interposing a resilient seal.
  • the invention provides that with multiplerow radial piston pumps comprising several base plates, at either side of each of which there is arranged a row of cylinder blocks, all the outlet manifolds of the base plates are connected to a common main collecting pipe extending within the pump casing and leading to a common pump outlet.
  • this pump outlet may be disposed at an end face of the pump, the more convenient location is at the pump circumference.
  • the structure of the novel pump permits to fasten a connecting pipe of the high pressure outlets of different base plates at the base plates. This avoids the effect of a hydraulic force which would urge the two interconnected base plates apart if the connecting pipes were inserted loosely.
  • the invention comprises different possibilities of a sealing engagement between the pump outlet and the circumference of the pump casing enclosing the bath of the hydraulic medium.
  • the invention is not limited to radial piston pumps comprising an even number of rows of cylinder blocks. It is possible, for instance, to connect additional rows of cylinder blocks through at least one adjacent row of cylinder blocks to a base plate by interconnecting the outletpipes of a plurality of cylinders in the axial direction of the pump.
  • FIG. 1 is an axial sectional elevation of a two-row radial piston pump embodying the invention
  • FIG. 2 is a section of a transverse sectional elevation through the central plane of the base plate of the radial piston pump shown in FIG. 1, taken in the area where the pump outlet pipe is secured at the high pressure outlet of the base plate;
  • FIG. 3 is a side elevational view, partly in section, of a four-row radial piston pump embodying the invention
  • FIG. 4 is a sectional view, partly in cross section through the central plane of a base plate and partly in cross section directly before one side surface of the base plate, showing the position where the pump outlet pipe is secured to the common high pressure outlet of the one base plate of the radial piston pump shown in FIG. 3;
  • FIG. 5 is an axial sectional elevation of a six-row radial piston pump embodying the invention.
  • FIG. 6 is a longitudinal sectional elevation similar to FIG. 1, showing a modified embodiment of a two-row radial piston pump embodying the invention
  • FIG. 7 is a longitudinal sectional elevation of a fourrow radial piston pump constructed in accordance with the design principle of FIG. 1;
  • FIG. 8 is a longitudinal sectional elevation of a six-row radial piston pump constructed in accordance with the design principle of FIG. 1;
  • FIGS. 9 and 10 are fragmentary axial sectional views taken approximately on lines 99 and 10--10, respectively, of FIG. 11;
  • FIG. 11 is a fragmentary transverse sectional view of a modification of the four-row radial piston pump shown in FIG. 7.
  • All six pump arrangements having different numbers of rows, as shown in FIGS. 1, 3, and 5 to 8, comprise an eccentric shaft 1 extending axially through the pump.
  • the pump body or casing comprises two halves 3 and 5 made from aluminum pressure castings facing each other and with their edges abutting against each other.
  • Each pump casing half 3 and 5 carries a main bearing 7 for the eccentric shaft 1. The latter projects only out of casing half 5, the projecting end constituting a drive stub shaft 9.
  • a gasket 10 forms a seal between the eccentric shaft 1 and easing half 5.
  • Cylinder blocks 14 are provided which are arranged in asterisk shape and radially with respect to the eccentric shaft 1.
  • FIGS. 1 and 6 show, there are two such rows 12a and 12b of cylinder blocks; according to FIGS. 3 and 7 there are four rows 12a, 12b, 12c, and 12d; and according to FIGS. 5 and 8 there are six rows 12a, 12b, 12c, 12d, 12e, 12f.
  • In each row there are, for instance, three, five, or seven cylinder blocks spaced evenly around the circumference of the eccentric shaft 1.
  • German Gebrauchsmuster (utility model) 6 600 315 for a detailed description of a suitable design of the cylinder blocks reference may be had to German Gebrauchsmuster (utility model) 6 600 315.
  • the cylinder blocks 14 of the two rows 12a and 12b are arranged at either side of a steel base plate 30a formed with a system of bores 32 which serve as outlet manifold for the cylinder blocks of rows 12a and 12b adjacent the base plate 30a and which, therefore, are connected by portions 34 extending parallel to the eccentric shaft 1 to all the outlet valves of the cylinder blocks of these rows.
  • the four-row and six-row pumps shown in FIGS. 3 and 7, respectively, and 5 and 8, respectively, are provided between the cylinder block rows 12c and 12d with a second base plate 30b having an outlet manifold 32 for all the cylinder blocks 14 of rows 12c and 12d adjacent this base plate.
  • the cylinder blocks 14 of the two rows 12:: and 12f are arranged at either side of a base plate 300 of similar structure as base plates 30a and 30b and provided with an outlet manifold 32 for the cylinder blocks of these rows.
  • Narrow spacers 38 only are arranged in axial direction of the eccentric shaft 1 between the successive structural elements, namely between the half of the main bearing 7 fixed on the eccentric shaft and the cam 22 and the half of the ball bearing 24 fixed thereto pertaining to the first row 12a, the half of the secondary bearing 36 fixed on the eccentric shaft 1 and the cam and the half of the ball bearing fixed thereto pertaining to the next row 1212, etc.
  • the axial length of all these members, the axial space requirement of all cylinder blocks and of the base plate(s) arranged between the same, as Well as the axial length of the two casing halves 3 and 5 are chosen such that the cylinder blocks of the various rows and the base plate(s) disposed between the cylinder blocks can be sandwiched and clamped by means of clamping studs 44 between annular end face portions 40 and 42 of the two pump casing halves 3 and 5.
  • the clamping studs 44 extend parallel to the eccentric shaft 1 through the entire pump and at the same time serve to locate the cylinder blocks in radial direction and in circumferential direction. For this purpose the clamping sutds 44 engage in corresponding recesses in the cylinder blocks.
  • the peripheral portions 46 and 48 thereof surround not only the cylinder blocks 14 but also the base plate 30a or all base plates 30a, 30b, 304:, respectively.
  • the free edges of the pump casing halves 3 and 5 meet in a butt joint at 50a.
  • a sealing ring 52a inserted at the butt joint projects somewhat out of the flat abutment surface and is compressed under the compressive force as the pump casing halves are clamped together. If the drawing shows the sealing ring completely within the flat abutment surface, this is nothing but diagrammatic idealization. This arrangement does not provide for positive centralizing of the two pump casing halves with respect to each other since this is unnecessary in view of the fact that the overall arrangement results in selfcentralization.
  • a stepped arrangement may be provided, as shown at 50b in FIGS. 3 and to 8, without effecting positive centralizing of the two shell halves 3 and 5 relative to each other.
  • the sealing ring 52 inserted between the steps affords a certain degree of radial freedom.
  • the relatively great axial length of portion 54 of casing half 5 extending over the outer periphery of the sealing ring 52b and some clearance 56 between said portion 54 and the axially adjacent portion of the stepped surface of easing half 3 warrant that also with this arrangement the cylinder blocks 14 and base plate(s) are properly clamped between the casing halves 3 and 5.
  • the suction opening 60a, through which the hydraulic medium flows into the hydraulic bath enclosed by the pump casing 3, 5 is formed as an integral part of the pressure casting at the front end of easing half 3.
  • the multi-row radial piston pumps according to FIGS. 3, 5, and 8 instead have the pump inlet 60b formed at the periphery of casing half 5.
  • the high pressure outlets of the radial piston pumps may be provided either at an end face of the pump or at the circumference thereof. The latter solution provides an especially compact structure of the pump and therefore has been chosen for all the embodiments represented in the present application.
  • the opening 72 provided in casing half 5, into which opening the high pressure pipe 70 forming the pump outlet is inserted in sealing engagement by means of sealing ring 74, is not disposed opposite the high pressure outlet 80a of the base plate 30a.
  • the pump outlet pipe 70 for this reason comprises a portion 82 bent at an angle and ending in an extension 84 or 184 to be fastened at the high pressure outlet 80a.
  • An annular seal 86 is arranged between the extension 84 and the high pressure outlet 80a of the base plate 30a.
  • Two fastening bolts 88 (FIG.
  • FIGS. 7 and 8 show amplifications of the double-row structural design to constitute four-, six-, or corresponding multiple-row radial piston pumps.
  • the extension piece 84 of the double-row arrangement according to FIG. 1 is replaced by a high pressure pipe extension 184 of the bent portion 82 reaching up to base plate 3% in FIG. 7 and to base plates 30b and 300 in FIG. 8, respectively.
  • the individual high pressure outlets a of the various base plates, being sealed off by an annular seal 86 each, are connected to said pipe extension 184.
  • the pump casing halves 3 and 5 be arranged with radial clearance relative to the various base plates and rows of cylinder blocks and their high pressure connecting pipe 184.
  • FIGS. 3 and 5 show another arrangement of fourand six-row pumps to solve the problem of installation. On principle, this solution could also be applied to tworow radial piston pumps. A detailed description of this other installation arrangement will be given further below.
  • a common high pressure outlet 90 for all the base plates is provided at base plate 80a.
  • the high pressure outlets 80b of base plate 30b and of base plate 30c as well as of any further base plate are each connected to the common high pressure outlet 90 by a bridging high pressure pipe 92, being embodied by a single bridging high pressure pipe 92 where several base plates 30b and 300 are connected to the high pressure outlet 90 in a series arrangement as shown in FIG. 5.
  • the high pressure bridging pipe 92 is rigidly connected to the base plates, the high pressure outlet manifolds 32 of which it interconnects, as indicated by the brazing or welding lines 94 in the pipe sections forming the bridging pipe 92, see FIGS. 3 and 5.
  • the tubular pipe sections of the bridging pipe 92 are connected in a manner not particularly specified in the present application by means of intermediary pieces 96b and 900 which are secured to the base plate 30b or 300, rsepectively, in a manner similar to that of extension 84 (FIG. 2).
  • an extension 96a which corresponds to extension 84 of FIG. 2. Besides being connected to the high pressure outlet 80a of the base plate 30a and to the bridging pipe 92, this extension 96a is connected in radial direction in a straight line to the pump outlet pipe 70 with which it forms an integral structural unit. As may be gathered from FIG. 4, the extension 96a is mounted in the same manner as extension 84 according to FIG. 2. In this case, too, an annular seal 86 and two fastening bolts 88 offset in circumferential direction of the base plate 30a are provided. A portion bent at an angle of the pump outlet pipe 70, as shown in FIG.
  • the clearance opened at the opposite side is doubled and will correspond exactly to the dimension of the head of a fastening bolt 88, thus enabling a tool for handling the bolt to be inserted between the high pressure pipe 70 and the edge of the aperture 102.
  • the other fastening bolt can be rendered accessible by relative rotation between the base plate 30a and easing half in the opposite sense.
  • the double-row radial piston pump according to FIG. 6 differs from all other radial piston pumps shown in that the high pressure pipe 170 leading out of the pump casing constitutes a rigid projection of the base plate 130a With this design the assembly is facilitated in that the base plate is formed as a particular ring member having a wide inner bore 172 which is dimensioned such that the base plate may be pushed over the adjacent ball bearing 24 so that, with casing half 5 removed, the rigid projection 170 may be pushed from inside into the aperture 72 in casing half 3.
  • FIGS. 9, and 11 illustrate a modification of the invention in which a four-row radial piston pump of the nature shown in FIG. 7 has different base plates 30a and 30b connected to different high pressure pump outlets, so that a unitary pump assembly will give the functions of two pumps.
  • a high pressure pump outlet 70 extends through and is sealed in an opening 72 in the peripheral part of casing half 5 and has a relatively long lateral extension 18411 which is connected near its end with the pressure manifold 32 of base plate 30b.
  • a second high pressure pump outlet 71 (FIGS. 10 and v1) extends through and is sealed in a second opening 72a formed in the peripheral part of easing half 5 at a location spaced angularly away from the location of outlet 70.
  • the second outlet 71 has a relatively short lateral extension 1 84b that is connected near its end with the pressure manifold 32 of base plate 30a.
  • a radial piston pump for hydraulic pressure systems comprising mating hollow casing members which together form a pump casing adapted to hold a bath of hydraulic pressure fluid, a rotary shaft extending into said casing and supported rotatably therein by bearing means on opposite end portions of said casing members, at least one two-row assembly of radial piston pumps disposed about said shaft inside said casing, each said assembly including a base plate lying transverse to said shaft and provided with manifold for fluid under pressure and, at either side of said base plate, an asterisk-shaped row of cylinder blocks each of which contains a cylinder having a piston reciprocable radially therein and having a fluid outlet connected with said manifold, said shaft having eccentric means thereon for displacing the pistons in the cylinder blocks of each said row so as to pump fluid into the manifold of the related base plate, pipe means for fluid under high pressure connected with each said manifold and extending from it through said pump casing to the outside, and clamping bolts extending between opposite end wall portions of said cas
  • a radial piston pump according to claim 1 a part of said pipe means being fastened to a peripheral portion of the base plate of each said assembly.
  • a radial piston pump according to claim 1 the largest diameter of the components of each said assembly being smaller than the inner diameter of the circumferential wall portions of said casing members.
  • a radial piston pump according to claim 1 said casing members having mating circumferential edge surfaces on respective circumferential wall portions thereof, said edge surfaces being clamped against each other in confronting relation With resilient sealing means disposed therebetween.
  • a radial piston pump according to claim 1, one of said casing members having an aperture extending through a circumferential wall portion thereof, the manifold of the base plate of each said assembly having an outlet located axially beyond the axial extent of said one cas ing member, said pipe means including a pump outlet fitted into said aperture in sealing engagement therewith, a pipe extending inside said casing at an angle from said pump outlet to said manifold outlet of at least one said assembly, and means fastening said pipe in sealed relation to said manifold outlet.
  • said eccentric means including an eccentric cam member on said shaft for each said row and an annular anti-friction hearing fitted upon each said cam member between the same and the radially inner ends of the pistons in the cylinder blocks of such row, the base plate of each said assembly having an annular anti-friction bearing fitted in a central bore thereof and fitting upon said shaft for additionally supporting said shaft.
  • a radial piston pump according to claim 6 the axial extent of each said eccentric cam member and said bearing fitted thereupon being smaller than the axial extent of the associated cylinder blocks, and annular spacers being fitted on said shaft between the successive cam members and bearings thereon.
  • a radial piston pump according to claim 1 one of said casing members having an aperture extending through a circumferential wall portion thereof, the base plate of one said assembly being disposed susbtantially in radial alignment with said aperture, said pipe means comprising a rigid tubular pump outlet projecting radially from said base plate through and sealed to the margin of said aperture.
  • a radial piston pump according to claim 1 said casing members being composed of a metal material or a plastic material that would not safely resist the output fluid pressure of the pump.
  • a radial piston pump according to claim 1 having a plurality of said two-row assemblies clamped one axially against another along said bolts inside said pump casing, with at least one said row of cylinder blocks of each said assembly bearing laterally against an adjacent said row of cylinder blocks of another said assembly.
  • a radial piston pump according to claim 10 said pipe means comprising a single pipe for fluid under pressure connected in common with the respective manifolds of the base plates of all said assemblies.
  • a radial piston pump according to claim 10 said pipe means comprising one pipe for fluid under pressure connected with the manifold of the base plate of at least one of said assemblies and a separate pipe for fluid under pressure connected with the manifold of the base plate of at least one other of said assemblies.
  • a radial piston pump according to claim 10 one of said casing members having an aperture extending through a circumferential wall portion thereof, the base plate of one of said assemblies being disposed substantially in radial alignment with said aperture, said pipe means comprising a pipe for fluid under pressure connected in common with the manifolds of the respective base plates of all said assemblies, a pump outlet disposed in said aperture, said pipe leading into said pump outlet, and means fastening said pump outlet to a peripheral portion of said one base plate, said aperture being sufficiently larger than said pump outlet in the circumferential direction of said casing that a clearance enabling manipulation of said fastening means from outside said one casing member may be provided between said pump outlet and the margin of said aperture, and resilient means fitted between said margin and said pump outlet for sealing the latter in said aperture.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US8681A 1969-02-11 1970-02-04 Radial piston pump Expired - Lifetime US3667868A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19691906773 DE1906773A1 (de) 1969-02-11 1969-02-11 Radialkolbenpumpe mit beidseitig einer Grundplatte aufgespannten Zylinderbloecken
CH120270A CH504622A (de) 1969-02-11 1970-01-28 Radialkolbenpumpe

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US3667868A true US3667868A (en) 1972-06-06

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US8681A Expired - Lifetime US3667868A (en) 1969-02-11 1970-02-04 Radial piston pump

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US (1) US3667868A (enrdf_load_stackoverflow)
AT (1) AT296032B (enrdf_load_stackoverflow)
BE (1) BE745745A (enrdf_load_stackoverflow)
GB (1) GB1264583A (enrdf_load_stackoverflow)
NL (1) NL7001958A (enrdf_load_stackoverflow)
SE (1) SE357033B (enrdf_load_stackoverflow)

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CN109944759B (zh) * 2019-02-25 2024-05-03 浙江工业大学 一种一体式多排高压径向多柱塞变量泵
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Also Published As

Publication number Publication date
GB1264583A (enrdf_load_stackoverflow) 1972-02-23
AT296032B (de) 1972-01-25
BE745745A (fr) 1970-07-16
SE357033B (enrdf_load_stackoverflow) 1973-06-12
NL7001958A (enrdf_load_stackoverflow) 1970-08-13

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