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WO2012069046A1 - Pompe à pistons radiaux - Google Patents

Pompe à pistons radiaux Download PDF

Info

Publication number
WO2012069046A1
WO2012069046A1 PCT/DE2011/075268 DE2011075268W WO2012069046A1 WO 2012069046 A1 WO2012069046 A1 WO 2012069046A1 DE 2011075268 W DE2011075268 W DE 2011075268W WO 2012069046 A1 WO2012069046 A1 WO 2012069046A1
Authority
WO
WIPO (PCT)
Prior art keywords
radial
piston pump
housing
radial piston
suction
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.)
Ceased
Application number
PCT/DE2011/075268
Other languages
German (de)
English (en)
Inventor
Karl Prinzhorn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ixetic Bad Homburg GmbH
Original Assignee
ixetic Bad Homburg GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by ixetic Bad Homburg GmbH filed Critical ixetic Bad Homburg GmbH
Priority to DE112011103896T priority Critical patent/DE112011103896A5/de
Publication of WO2012069046A1 publication Critical patent/WO2012069046A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • F04B1/0443—Draining of the housing; Arrangements for handling leaked fluids
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections

Definitions

  • the invention relates to a radial piston pump according to the preamble of claim 1.
  • Radial piston pumps of the type discussed here are known. They have a housing with a drive shaft, which is associated with a non-rotatable eccentric. This lies within a cylinder block having at least one radial bore. In this a piston is movably arranged, which cooperates with the eccentric. A radial shaft seal surrounding the drive shaft seals the housing from the environment. The suction region of the radial piston pump is provided on the eccentric side facing the at least one piston and thus also surrounds the drive shaft. If a negative pressure occurs in the suction area, this can act up to the radial shaft seal, so that a secure seal of the housing is not guaranteed.
  • the object of the invention is therefore to provide a radial piston pump which does not have this disadvantage.
  • a radial piston pump of the above type which comprises the features listed in claim 1. It has a separate fluid connection between the side of the radial shaft sealing ring facing the inside of the housing and a suction region of the radial piston pump. A vacuum in the suction area can not spread in this way to the radial shaft seal. Rather, it is ensured that sufficient pressure is applied to the radial shaft sealing ring in each operating state of the radial piston pump, so that the sealing effect can be taken over by a sealing lip of the radial shaft sealing ring. Dust lips of the radial shaft seal must therefore not support the sealing effect.
  • the radial piston pump is characterized in that the separate fluid connection is realized at least partially by a screw hole.
  • the fluid connection comprises an additional channel between the radial shaft seal and the screw hole. It is thus possible to create a fluid connection to the radial shaft sealing ring from a screw hole, which is fixed in its position by the basic structure of the radial piston pump.
  • the fluid connection comprises a provided in a contact region between the housing and cylinder block channel.
  • the radial piston pump is usually realized by a plurality of components which are pressure-tightly secured to each other. It is possible here to realize a channel in the area of contact between two parts, in this case between the housing and the cylinder block. This is preferably feasible by a groove which is provided in the housing and / or in the cylinder block. Such a fluid connection is easily realized.
  • a preferably actively designed suction throttle is provided between the intake and suction. With this, the volume flow of the radial piston pump can be adjusted.
  • an embodiment of the radial piston pump which is characterized by a bearing for supporting the drive shaft in the housing and in that for its lubrication between the bearing and suction a fluid path is provided. About this fluid path, the funded by the pump medium can be used and used for lubrication of the bearing.
  • Another preferred embodiment of the radial piston pump is characterized in that the fluid path continues to the suction region, wherein the flow resistance between the intake and bearing is smaller than that between the bearing and suction.
  • the flow direction of the medium present in the intake region can be defined. It forcibly flows through the bearing when there is less pressure in the suction area than in the suction area. At the same time, it is prevented that a negative pressure in the suction area can have a negative effect on the radial shaft seal.
  • Figure 2 is an end view of the reproduced in Figure 1 radial piston pump.
  • the radial piston pump 1 serves to convey a medium, preferably oil, and has a housing 3 in which a drive shaft 5 is mounted with an eccentric 7 connected to it in a rotationally fixed manner. It also comprises a cylinder block 9 with at least one preferably radially extending bore, that is, with a bore which is perpendicular to a central axis 1 1 of the drive shaft 5 is arranged. In this at least one hollow piston, not shown here, is arranged to be radially movable, which cooperates with the eccentric 7.
  • the piston Upon rotation of the drive shaft and thus of the eccentric 7, the piston is pressed against the force of a spring radially outward, whereby the medium is conveyed into a pressure range, which is connected to a consumer, and whereby in the region in which the piston Excess 7 touches the suction area 14, a negative pressure is built up to suck the medium.
  • a negative pressure is built up to suck the medium.
  • the drive shaft of the at least one piston is pressed, for example by a spring inwardly in the direction of the central axis 1 1, whereby the conveying medium enters the piston.
  • the medium passes from the outside into the intake region of the radial piston pump 1, preferably via a suction throttle 13.
  • the function of a radial piston pump 1 is basically known, so that will not be discussed in detail here.
  • the drive shaft 5 - here on the left - emerges from the housing 3. It is here provided in the outlet region for sealing the housing with a radial shaft sealing ring 15, which, seen in cross section, U-shaped, wherein a first leg 17 rests on the peripheral surface of the drive shaft 5 and a second leg 19 inside the housing 3. The enclosed by the two legs 17 and 19 cavity 20 opens inwardly into the housing. 3
  • the radial piston pump 1 has a separate fluid connection 21, which extends to the side of the radial shaft sealing ring 15 facing the inside of the housing, that is, up to the cavity 20 delimited by the legs 17 and 19. From the partial longitudinal section through the radial piston pump 1 according to FIG it can be seen that the separate fluid connection 21 is realized at least in regions by a screw hole 23.
  • a screw 25 is used, which has a screw head 27, a shaft 29 and an external thread 31.
  • the screw 25 passes through a first housing part 33/1 and the cylinder block 9 and extends into a second housing part 33/2.
  • the two housing parts 33/1 and 33/2 surround the cylinder block 9 and thus form the housing 3 of the radial piston pump first By the screw 25, the housing parts 33/1 and 33/2 are firmly connected and close the cylinder block 9 pressure-tight.
  • the radial piston pump 1 has a plurality of such screws 25 in order to ensure a secure and stable connection of the housing parts 33/1 and 33/2. They are all housed in screw holes 23, at least part of which is the fluid connection 21.
  • the second housing part 33/2 is formed as a central plate which separates the radial piston pump 1 from at least one further pump unit which is combined with the radial piston pump 1. This should not be discussed further here.
  • the drive shaft 5 is mounted via a bearing in the housing 3, here via a first bearing 35/1 in the first housing part 33/1 and via a second bearing 35/2 in the second housing part 33/2.
  • the two bearings are here exemplified as plain bearings. From Figure 1 it can be seen that the drive shaft 5 protrudes from the second housing part 33/2 and engages in the at least one further pump unit, thus also serves as a drive shaft for the at least one further pump unit.
  • the external thread 31 of the screw 25 engages in an internal thread 37 in the second housing part 33/2, which is formed in the region of a blind hole 39.
  • FIG. 1 shows that the right end of the shaft 29 of the screw 25 engages in a blind hole 39.
  • the right end of the screw is tightly closed.
  • the screw head 27 At the opposite end of the screw 25 is the screw head 27, which is in engagement with the housing 3, here with the housing part 33/3.
  • the screw hole 23 is sealed.
  • an O-ring can be provided, which surrounds the shaft 29 and closes tight.
  • the shaft 29 of the screw 25 passes through the first housing part 33/1, and also the cylinder block 9.
  • the screw hole 23 forming part of the fluid connection 21 extends from the first housing part 33/1 into the cylinder block 9 and ends in the blind hole 39 the contact area of the first housing part 1 with the cylinder block 9 must be ensured that a tight seal is given here.
  • an O-ring surrounding the screw hole 23 is provided between the first housing part 33/1 and the cylinder block 9, said O-ring surrounding the screw hole 23. dial piston pump 1 is clamped so that the screw hole 23 and thus the fluid connection 21 is sealed to the outside.
  • the fluid connection 21 comprises an additional channel 41, which extends between the screw hole 23 and the radial shaft sealing ring 15, more precisely ends on the inside of the housing 3 side facing and thus is also in fluid communication with the cavity 20.
  • a likewise the separate fluid connection 21 attributable channel 43 is provided, on the one hand with the screw hole 23 and on the other hand with a bore 45 in the second housing part 33/2 of the housing 3 in Connection stands.
  • the bore 45 which also forms part of the fluid connection 21, is also connected to the suction region of the radial piston pump 1 in such a way that the suction throttle 13 has no influence on the flow cross section in the fluid connection between bore 45 and suction.
  • the screw hole 23 and the bore 45 are preferably parallel to the central axis 1 1 of the drive shaft fifth
  • the channel 43 can be realized by a groove arranged in the contact area between the cylinder block 9 and the housing 3, in this case the second housing part 33/2, which is provided either only in the surface of the cylinder block 9 or in the surface of the second housing part 33/2 is.
  • This embodiment has the advantage that, for example, a known, unchanged cylinder block for the realization of the radial piston pump 1 can be used, which is combined with a modified second housing part 33/2.
  • an existing second housing part 33/2 can be combined without groove with a cylinder block 9, which is designed with a groove for the realization of the channel 43. It is thus possible to use existing elements of a radial piston pump 1 for the realization of the channel 43. But it is also possible, in both adjacent part, ie in the cylinder block 9 and in the second housing part 33/2, which - as I said - can also be designed as a center plate, each introducing a groove to form the channel 43.
  • the fluid connection 21 is therefore after all connected on the one hand via the bore 45 with the suction of the radial piston pump 1, on the other hand with the cavity 20 of the radial shaft sealing ring 15th
  • a first portion 47/1 of a fluid path 49 is provided so that the funded by the radial piston pump 1 medium, in particular oil, for the lubrication of can serve the first camp 35/1.
  • the fluid path 49 continues over a second section 47/2 to the suction region 14, the second section 47/2 extending between the first bearing 35/1 and the suction region 14.
  • the first leg 17 can lift off from the drive shaft 5 and / or the second leg 19 from the inside of the housing 3 and the first housing part 33/1.
  • FIG. 2 shows the radial piston pump 1 in front view, here is a view of the left side in Figure 1 side.
  • the same and functionally identical parts are provided with the same reference numerals; In this respect, reference is made to the description of FIG.
  • the representation according to FIG. 2 serves to clarify the sectional plane selected in FIG. For this purpose, this sectional plane is shown in Figure 1 by a dashed line ll. It runs from the top right to the middle of the screw 25 and from there to the bottom right through the central axis 1 1 of the drive shaft fifth
  • the suction throttle 13 can be seen, also an intake port 51 through which the radial piston pump 1 sucks a medium.
  • the flow direction of this medium is indicated by a double arrow 53.
  • the intake of the radial piston pump 1 is quasi defined here.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

L'invention concerne une pompe à pistons radiaux (1) dotée : d'un boîtier (3); d'un arbre d'entraînement (5); d'un excentrique (7) accouplé de manière solidaire en rotation à l'arbre d'entraînement (5); d'un bloc-cylindres (9); d'au moins un alésage radial dans le bloc-cylindres (9); d'au moins un piston coopérant avec l'excentrique (7) et pouvant être déplacé dans l'alésage radial; d'une bague d'étanchéité d'arbre radial (15) entourant l'arbre d'entraînement (5) et étanchéifiant le boîtier (3) par rapport à l'environnement; d'une zone d'aspiration (14) disposée sur le côté du ou des pistons opposé à l'excentrique (7); et d'une communication fluidique (21) séparée entre le côté de la bague d'étanchéité d'arbre radial (15) tourné vers le côté intérieur du boîtier (3) et une zone d'aspiration de la pompe à pistons radiaux (1). La pompe à pistons radiaux se caractérise par le fait que la communication fluidique (21) séparée est réalisée au moins par endroits à travers un trou de vis (23).
PCT/DE2011/075268 2010-11-24 2011-11-11 Pompe à pistons radiaux Ceased WO2012069046A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE112011103896T DE112011103896A5 (de) 2010-11-24 2011-11-11 Radialkolbenpumpe

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102010060768 2010-11-24
DE102010060768.1 2010-11-24

Publications (1)

Publication Number Publication Date
WO2012069046A1 true WO2012069046A1 (fr) 2012-05-31

Family

ID=45855428

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2011/075268 Ceased WO2012069046A1 (fr) 2010-11-24 2011-11-11 Pompe à pistons radiaux

Country Status (2)

Country Link
DE (1) DE112011103896A5 (fr)
WO (1) WO2012069046A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002462A (en) * 1957-08-13 1961-10-03 Racine Hydraulics & Machinery Fluid translating apparatus
DE19612412A1 (de) * 1996-03-28 1997-10-02 Rexroth Mannesmann Gmbh Regelung für ein Druckfluid-Versorgungssystem, insbesondere für den Hochdruck in einem Kraftstoff-Einspritzsystem
DE19926308A1 (de) * 1999-06-09 2000-12-21 Bosch Gmbh Robert Pumpenanordnung für Kraftstoff
WO2001033077A1 (fr) * 1999-11-04 2001-05-10 Luk Fahrzeug-Hydraulik Gmbh & Co. Kg Pompe a pistons radiaux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002462A (en) * 1957-08-13 1961-10-03 Racine Hydraulics & Machinery Fluid translating apparatus
DE19612412A1 (de) * 1996-03-28 1997-10-02 Rexroth Mannesmann Gmbh Regelung für ein Druckfluid-Versorgungssystem, insbesondere für den Hochdruck in einem Kraftstoff-Einspritzsystem
DE19926308A1 (de) * 1999-06-09 2000-12-21 Bosch Gmbh Robert Pumpenanordnung für Kraftstoff
WO2001033077A1 (fr) * 1999-11-04 2001-05-10 Luk Fahrzeug-Hydraulik Gmbh & Co. Kg Pompe a pistons radiaux

Also Published As

Publication number Publication date
DE112011103896A5 (de) 2013-08-22

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