EP0430099A1 - Pompe à pistons radiaux, en particulier pour des installations hydrauliques, ainsi que l'élément de mise sous pression - Google Patents

Pompe à pistons radiaux, en particulier pour des installations hydrauliques, ainsi que l'élément de mise sous pression Download PDF

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Publication number
EP0430099A1
EP0430099A1 EP90122409A EP90122409A EP0430099A1 EP 0430099 A1 EP0430099 A1 EP 0430099A1 EP 90122409 A EP90122409 A EP 90122409A EP 90122409 A EP90122409 A EP 90122409A EP 0430099 A1 EP0430099 A1 EP 0430099A1
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EP
European Patent Office
Prior art keywords
piston
pressure generating
generating element
pressure
radial
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90122409A
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German (de)
English (en)
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EP0430099B1 (fr
Inventor
Bernd Dämmrich
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Individual
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Individual
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Publication of EP0430099A1 publication Critical patent/EP0430099A1/fr
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Classifications

    • 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
    • F04B1/0421—Cylinders
    • 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
    • F04B1/0439—Supporting or guiding means for the pistons

Definitions

  • the present invention relates to radial piston pumps, in particular for hydraulic systems, and a pressure generating element therefor.
  • radial piston pumps as are known for example from DE-OS 35 00 432, DE-OS 34 24 862, DE-OS 30 39 197 and DE-GM 85 04 213, a plurality of cylindrical pressure generating elements with piston receiving part and sliding therein the piston is screwed radially to a drive shaft with an eccentric in a common pump housing.
  • the pressure generating elements or more precisely the piston receiving parts of the pressure generating elements have a cuboid shape and are screwed onto carrier elements or onto the pump housing.
  • the design of the pressure generating elements as separate components that are detachable from the radial piston pump as a whole allows the flexible adaptation of one and the same pump body to different requirements with regard to the media to be conveyed, the pressures to be generated, etc.
  • radial piston pumps such as those described in DE-PS 923 589 are known, however, there is the disadvantage that there is a risk of deforming the piston bore in the piston receiving part by screwing the cuboid piston receiving part onto the pump housing or onto a carrier part. Since radial piston pumps are also operated at speeds of up to 3000 revolutions per minute and more, this can easily lead to the destruction of the pressure generating elements.
  • the sensible arrangement of the valves presents difficulties, since valves or suction and pressure connections can be arranged only with great difficulty transversely to the screwing direction.
  • the pressure element By providing a receiving opening in the pump housing or in a part connected to the pump housing and running axially to the drive shaft, it is possible to install the pressure element in a form-fitting manner in the radial piston pump.
  • the radial forces exerted by the eccentric are thus transmitted positively and no longer only frictionally to the component carrying the receiving opening.
  • the component supporting the receiving opening can be designed according to different requirements, such as mechanical strength, vibration and sound absorption behavior, corrosion resistance, specific weight, etc.
  • the component carrying the receiving opening can simultaneously take over the function of the piston head. Due to the axial arrangement of the pressure generating element in the component carrying the receiving opening, the pressure and suction connections or pressure and suction valves can be arranged almost anywhere in or on the pressure generating element.
  • the receiving opening and / or the pressure generating element or piston receiving part inserted into the receiving opening is symmetrical, in particular point symmetrical, with respect to the axial installation direction.
  • the receiving opening can thus be designed in the form of a bore with a constant cross section. This simplifies the manufacture of the radial piston pump according to the invention.
  • the receiving opening and / or the outside of the pressure generating element or the piston receiving part is profiled.
  • this profiling can have a favorable influence on the noise emission and, on the other hand, the piston receiving part can be locked in a simple manner tangential to the drive shaft.
  • the locking of the pressure generating element or the piston receiving part in the component carrying the receiving opening can additionally or alternatively by a fastening means, e.g. in the form of a pin.
  • the size of the pressure generating element, in particular the piston receiving part, can be reduced.
  • a particularly suitable pressure generating element is provided. Because the piston receiving part is arranged transversely to the direction of movement of the piston, an axial installation of the pressure generating element in a radial piston pump is possible.
  • FIGs 1, 2, 3 and 4 show a first embodiment of the radial piston pump according to the invention the pressure generating element.
  • the radial piston pump has a drive shaft 2 which is mounted in a pressure plate 4 and a flange plate 6.
  • An annular or cylindrical pump housing 8 extends between the pressure plate 4 and the flange plate 6, in the wall of which the receiving openings 10 are in the form of bores.
  • Pressure generating elements 12 with piston receiving part 14, piston 16, piston bore 18 and suction channel 20 and pressure channel 22 are installed in the receiving openings.
  • Pressure plate 4, flange plate 6 and pump housing 8 enclose a piston drive chamber 7 from which the fluid to be compressed is sucked in via the suction channel 20.
  • the piston 16 is moved during the pressure stroke by an eccentric 24 fastened on the drive shaft 2; up in the drawing.
  • the piston 16 is hollow and, together with the piston bore 18, forms a compression space 17.
  • the piston 16 can be sealed against the piston bore 18 with a seal, not shown, which surrounds the piston 16 in a ring.
  • the piston 16 is moved by a piston spring 26 - downward in the drawing - which is arranged in the interior of the piston 16 and is supported in the piston 16 itself and in the piston receiving part 14 at the bottom of the piston bore 18.
  • the suction channel 20 is integrated in the piston 16, while the pressure connection is provided laterally in the piston receiving part 14 in contact with the pressure plate 4.
  • a suction valve 30 or a pressure valve 32 is arranged in the form of ball valves.
  • the suction valve 30 consists of a ball 34 which is pressed by a suction valve spring 36 against a suction valve seat 38 inside the piston 16 and seals the suction channel 20 against the piston drive chamber 7 during the pressure stroke.
  • the suction valve spring 36 is supported on the bottom of the piston bore 18 on the piston receiving part 14 and on the ball 34.
  • the pressure channel 22 connects the compression space 17 to a pressure connection line 40 accommodated in the pressure plate 4.
  • the pressure valve 32 is accommodated with a pressure valve spring 42, a ball 44 and a ball stop 46.
  • the pressure channel 22 is sealed off from the pressure plate 4 by a seal 48.
  • the piston 16 Due to the rotary movement of the drive shaft 2, the piston 16 is periodically pushed into the piston receiving part 14 by the eccentric 24 - pressure stroke - and periodically pushed out of the piston receiving part 14 again by the piston spring 26 to the lower reversal point.
  • the ball 34 is lifted off the ball seat against the suction valve spring 36 and the fluid can flow through the T-shaped suction channel 20 into the compression space 17 into the piston bore 18.
  • the pressure channel 22 is closed off by the ball 44 loaded by the pressure valve spring 42.
  • the piston 16 If, during the pressure stroke, the piston 16 is moved into the upper reversal point by the eccentric 24, the suction valve spring 36 and the higher pressure which builds up pushes the ball 34 onto the suction valve seat 38 and the ball 44 is pressed against the pressure valve spring 42 due to the high pressure building up lifted from their seat.
  • the ball stop 46 limits the possible path of the ball 44 in the fluid flowing into the pressure channel 22.
  • the suction valve 30 is arranged at the end of the T-shaped suction channel 20 in the interior of the piston 16.
  • the suction valve 30 can, however, not only be accommodated in the piston, but almost anywhere in the pressure generating element. Examples of this are shown in the pressure generating elements 60 and 70 according to FIGS. 6 and 7.
  • the embodiment of the pressure generating element 60 according to FIG. 6 has a suction channel 62 which is arranged in parallel next to the piston bore 18.
  • the suction channel 62 opens next to the piston bore 18 in the piston drive chamber 17, so that the fluid to be compressed can be sucked out of the piston drive chamber 17.
  • a suction valve 66 is arranged immediately behind the mouth of the suction channel 62 in the piston drive chamber 17.
  • the suction valve 66 differs from the suction valve 30 only in the configuration of the suction valve spring.
  • the suction valve 66 has a suction valve spring 68 which is supported on a shoulder 69 and not on the bottom of the piston bore 18, as is the case with the suction valve spring 36 of the above-described embodiments.
  • the suction channel 62 opens into the pressure channel 22 in the the pressure valve 32 is housed.
  • the design and function of the pressure valve 32 and the other components completely match the design and function of the embodiments according to FIGS. 1 to 5, so that a detailed description is unnecessary.
  • FIG. 7 shows a further embodiment of a pressure generating element 70.
  • the pressure generating element 70 has a suction channel 72, which does not open into the piston drive chamber, but rather into a suction feed line 74 accommodated in the flange plate 6. Suction channel 72 or suction feed line 74 are sealed by a seal 76 .
  • the suction valve 78 accommodated in the suction channel 72 corresponds completely to the suction valve 66 of the pressure generating element 60.
  • the embodiment according to FIG. 7 is particularly advantageous in the case of fluids to be compressed which, owing to their chemical (for example corrosive), physical (for example temperature) and / or biological (for example bacteriologically contaminated) properties, are to be carried out separately from the other parts of the radial piston pump .
  • FIG. 8 shows a design of a piston 80 that is particularly suitable for the delivery of such fluids.
  • a piston spring 82 surrounds the piston 80 in the region that protrudes from the piston bore.
  • the piston spring 82 is supported on the edge of the piston bore 18 and on a shoulder 84.
  • the embodiment of the piston according to FIG. 8 is not limited to the conveyance of corrosive media.
  • FIG. 9 shows a special embodiment of a piston 90.
  • the piston 90 consists of a piston part 91 and a sliding washer 92.
  • the separation of the piston 90 in the piston part 91 and the sliding washer 92 makes it possible to reduce transverse forces which can occur due to manufacturing tolerances.
  • Through a more or less central bore 94 in the piston part or 95 in the sliding washer 92 there is a hydrostatic one Relief of the piston 90 possible.
  • this type of hydrostatic relief is only possible if the suction channel is not inside the piston.
  • the embodiment of the piston 90 is therefore particularly suitable for the pressure generating element 60 shown in FIG. 6.
  • the piston 100 shown in FIG. 10 shows a possibility for a hydrostatic relief.
  • a relief bore 104 is placed in the direction of movement of the piston so that it does not pass through a transverse T-shaped suction channel 102.
  • the relief bore 104 is shown in FIG. 10 offset by 90 ° for reasons of drawing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
EP90122409A 1989-11-27 1990-11-23 Pompe à pistons radiaux, en particulier pour des installations hydrauliques, ainsi que l'élément de mise sous pression Expired - Lifetime EP0430099B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3939184 1989-11-27
DE3939184A DE3939184A1 (de) 1989-11-27 1989-11-27 Radialkolbenpumpe, insbesondere fuer hydraulikanlagen sowie druckerzeugungselement hierfuer

Publications (2)

Publication Number Publication Date
EP0430099A1 true EP0430099A1 (fr) 1991-06-05
EP0430099B1 EP0430099B1 (fr) 1994-10-05

Family

ID=6394279

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90122409A Expired - Lifetime EP0430099B1 (fr) 1989-11-27 1990-11-23 Pompe à pistons radiaux, en particulier pour des installations hydrauliques, ainsi que l'élément de mise sous pression

Country Status (2)

Country Link
EP (1) EP0430099B1 (fr)
DE (2) DE3939184A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999042725A3 (fr) * 1998-02-17 1999-11-18 Continental Teves Ag & Co Ohg Pompe a piston

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4241827A1 (de) * 1992-12-11 1994-06-16 Teves Gmbh Alfred Geräuschreduziertes Pumpenaggregat, insbesondere für geregelte Bremsanlagen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR22669E (fr) * 1919-12-24 1921-08-04 Francois Louis Caut Dispositif rotatif pouvant servir de pompe, de moteur transmetteur de mouvement, de frein et autres applications
GB533405A (en) * 1939-11-03 1941-02-12 Automotive Prod Co Ltd Improvements in or relating to reciprocating pumps
FR2323031A1 (fr) * 1975-09-08 1977-04-01 Ferodo Sa Machine tournante hydraulique
DE3330803A1 (de) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Foerderelement
EP0304743A1 (fr) * 1987-08-25 1989-03-01 WEBER S.r.l. Pompe à pistons radiaux

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE923589C (de) * 1949-11-18 1955-02-17 Heilmeier & Weinlein O H G Hydraulik-Kolbenpumpe

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR22669E (fr) * 1919-12-24 1921-08-04 Francois Louis Caut Dispositif rotatif pouvant servir de pompe, de moteur transmetteur de mouvement, de frein et autres applications
GB533405A (en) * 1939-11-03 1941-02-12 Automotive Prod Co Ltd Improvements in or relating to reciprocating pumps
FR2323031A1 (fr) * 1975-09-08 1977-04-01 Ferodo Sa Machine tournante hydraulique
DE3330803A1 (de) * 1983-08-26 1985-03-14 Robert Bosch Gmbh, 7000 Stuttgart Foerderelement
EP0304743A1 (fr) * 1987-08-25 1989-03-01 WEBER S.r.l. Pompe à pistons radiaux

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999042725A3 (fr) * 1998-02-17 1999-11-18 Continental Teves Ag & Co Ohg Pompe a piston
US6450787B1 (en) 1998-02-17 2002-09-17 Continental Teves Ag & Co., Ohg Piston pump

Also Published As

Publication number Publication date
EP0430099B1 (fr) 1994-10-05
DE3939184C2 (fr) 1991-11-14
DE59007385D1 (de) 1994-11-10
DE3939184A1 (de) 1991-05-29

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