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EP1022461B1 - Pompe haute pression - Google Patents

Pompe haute pression Download PDF

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Publication number
EP1022461B1
EP1022461B1 EP00100848A EP00100848A EP1022461B1 EP 1022461 B1 EP1022461 B1 EP 1022461B1 EP 00100848 A EP00100848 A EP 00100848A EP 00100848 A EP00100848 A EP 00100848A EP 1022461 B1 EP1022461 B1 EP 1022461B1
Authority
EP
European Patent Office
Prior art keywords
piston
pressure pump
pump
accordance
secondary piston
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.)
Expired - Lifetime
Application number
EP00100848A
Other languages
German (de)
English (en)
Other versions
EP1022461A3 (fr
EP1022461A2 (fr
Inventor
Bernhard Arnold
Thomas Hofmann
Franz Wirzberger
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1022461A2 publication Critical patent/EP1022461A2/fr
Publication of EP1022461A3 publication Critical patent/EP1022461A3/fr
Application granted granted Critical
Publication of EP1022461B1 publication Critical patent/EP1022461B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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

Definitions

  • the invention relates to a high-pressure pump, in particular a radial piston pump according to the claim 1.
  • Radial piston pumps are used to generate high pressures, For example, as a high-pressure fuel pump in common-rail injection systems used. These pumps stand out due to low leakage and high volumetric efficiency from, with the comparatively simple constructive Construction it allows sealing gaps with those for minimization the leakage required to carry out manufacturing tolerances.
  • DE 195 07 295 A1 discloses a high-pressure pump, in particular a radial piston pump, with at least one driven by a drive shaft pump unit with a Displacer housing 30 in which a piston 2 is guided axially displaceable, with a Sliding 62 abuts an eccentric ring, the one, the piston 2 at least partially encompassing at a distance, guided in the displacer housing 30 and in a Plant position biased support piston 34 is supported.
  • piston 2 does not attack any return device (holding device), the piston 2 is located rather loosely on the shoe 62.
  • the support piston is hydraulically controlled.
  • a holding device 40 via which the extension movement of the Support piston 24 can be transferred to the piston 12.
  • US A 5,752,430 discloses a high pressure pump, in particular radial piston pump, with at least one driven by a drive shaft 100 pump unit with a Displacer housing 21 in which a piston 14 is guided axially displaceable.
  • the pump unit has a shoe 37 and a support piston 36 which are integral with each other are trained Since it is the slide shoe 37 and the support piston 36 is a component, of course, not the a component (support piston) to be biased against the other component (shoe), as this The subject of the present invention is.
  • DE 197 27 29 4 A1 shows a high pressure pump, for example, three or five of one Eccentric shaft driven pumping units in a pump housing are included.
  • Each of the pumping units has an in a positive displacement piston guided over a Slide shoe rests on an eccentric ring, which rotates an eccentric of the eccentric shaft is mounted. It lies the shoe on a flattening of the eccentric ring.
  • the eccentric ring shifted with the flattening perpendicular to the piston axis, so that a corresponding relative movement and the associated Friction between the sliding block and the eccentric ring arises.
  • this relative movement and the associated friction between the eccentric ring and shoe for tilting the eccentric ring and thus lead to destruction of the pump.
  • a support piston in the displacer housing stored which surrounds the piston in the distance and biased by a compression spring against the eccentric ring is, so that a tilting or twisting of the eccentric ring is practically excluded.
  • the piston via a retaining washer with the support piston connected so that the piston extract, i. the movement of the piston in the radial direction inward substantially caused by the coupling to the support piston, biased by the compression spring against the eccentric ring becomes.
  • the invention is based on the object to create a high-pressure pump in which the wear is reduced.
  • the support piston not as in State of the art - on the eccentric ring but on the Slider supported, so that there is no significant relative movement transverse to the support piston axis in the contact area of the support piston can come. That is, the supporting force of the Support piston is on the slide shoe on the eccentric ring transferred, with the relative movement between shoe and eccentric ring does not matter, since the shoe in terms his choice of material to an optimal anyway Slipperiness and abrasion resistance is selected.
  • the invention covers exemplary embodiments, in which the Supporting piston directly is supported on the shoe.
  • the support piston with a driving shoulder is executed, which is to transfer the extension movement on the piston in contact with the holding device can be brought.
  • This holding device is advantageously as Holding disk designed with a hub-shaped central portion is placed on the piston and the peripheral portion to the piston extract in contact with the support piston can be brought.
  • the Support piston directly on the shoe on.
  • the support piston is preferably with a radial shoulder provided, in which the peripheral portion the retaining disk dives, so that this in the piston extraction movement (radially inward) of the support piston is taken.
  • the shoe is very easy to install, if he means of a locking ring in a frontal Recording of the support piston is fixed.
  • the holding disc is preferably pressed onto the piston.
  • the contact pressure of the sliding shoe on the eccentric ring can be optimized even at high speeds, by providing breakthroughs in the support piston, can be introduced via the pressure medium in a pressure chamber to also to bias the shoe hydraulically against the eccentric ring.
  • Figure 1 shows a rear view of a feed pump 1, such as For example, in common rail fuel injection systems is used for internal combustion engines.
  • a feed pump such as For example, in common rail fuel injection systems is used for internal combustion engines.
  • a high pressure pump to pressurize the fuel with Pressing up to 2000 bar are usually radial piston pumps used in which several pumping units, for example three pumping units 2a, 2b, 2c in a pump housing 4 are included.
  • FIG. 2 shows a partial view of a section through the radial piston pump according to FIG. 1 along the line A-A. Accordingly, each pump unit 2 has a displacer housing 6 with a cylinder head 8 and in the radial direction extending inwardly, relative to the cylinder head 8 radially recessed cylinder 10, which is in the pump housing 4 dips.
  • the eccentric ring 16 is on a sliding bush 18 an eccentric 20 of a drive shaft 22 mounted, in turn About slide bearing in the pump housing 4 is performed.
  • a suction channel 28 In the cylinder head is a suction channel 28 with a suction valve 30 arranged over which the pressure medium (fuel) can be fed.
  • Pressure side is a pressure channel 32 in the cylinder head 8 is provided which leads to a pressure valve 34, in the parting plane between the cylinder head 8 and a Mounting flange of the pump housing 4 is arranged.
  • the output of the pressure valve 34 is via a pump housing side Pressure channel 36 with a not shown Connected to the manifold of the three pumping units 2a, 2b, 2c promoted pressure medium (fuel) a Consumable, in the present case fed to a common rail is.
  • the suction connection of the pump is via a pump housing side Suction channel 38 with the input of the suction valve 30th connected.
  • the pressure valve 34 and the suction valve 30 are both as spring-loaded seat valves, in particular as Check valves executed.
  • the piston 12 is connected via a retaining disk with the support piston 24 connected so that a pull-out movement of the support piston 24 to the axis 42 of the drive shaft 22 toward the introduction a suction stroke is transmitted to the piston 12.
  • FIG. 3 shows the contact area of the support piston 24 shown on the shoe 14 in an enlarged view, wherein the drawing part shown on the left of the piston axis 44 a first embodiment and the right of the Piston axis 44 shown drawing part another Embodiment show.
  • Cylinder 10 has a cylinder bore 46 in which the Piston 12 is guided.
  • the cylinder bore 46 is in the mouth area radially expanded, so that an annular space 48 is formed is from the piston 12, the shoe 14 and the Support piston 24 is limited.
  • the retaining washer 40 has a hub-shaped projection 50, with which they on the bottom in Figure 3 end portion of the piston 12 is pressed.
  • the hub-shaped projection 50 dips into the annulus 48 on.
  • the lower in Figure 3 end face of the retaining disc Aligns approximately with the adjacent end face of the piston 12, so that this and the retaining plate 40 flat on the Sliding shoe.
  • An outer peripheral portion 56 of the retaining washer 40 extends into the receptacle 54, so that the support piston 24 with an annular end face 58 on the retaining disc 40 and this in turn rests on the shoe 14. that is, in the embodiment shown on the left is based the support piston 24 via the drive plate 40 on the Slide shoe 14 off. This is about one in an annular groove the recording 54 recorded circlip 60 in the axial direction secured to a shoulder of the shoe 14 is present. This shoulder is characterized by a demotion of the formed frontal support surface 62 of the shoe 14, so that the bearing surface of the shoe 62 is slightly reduced becomes. However, this is accepted as the Assembly of the shoe 14 by inserting the mounting ring 60 is considerably simplified.
  • annular skirt of the support piston 24 In the annular skirt of the support piston 24 are two axiallybabstandete Breakthroughs 64, 66 formed by the lower Outer peripheral edge 68 of the cylinder 10 in succession on or are zuu Kunststoffbar.
  • the openings 64, 66 open in the region of the spring chamber of the support piston 24, with Pressure medium (for example, fuel) is filled. that is, through the apertures opened over the peripheral edge 68 64 and 66 can enter pressure medium in the annular space 48 and the retaining washer 40 and the shoe 14 in the direction biasing on the eccentric ring 16.
  • Pressure medium for example, fuel
  • FIG. 3 shows an improved right of the central axis 44 Embodiment, which is substantially different from the above Embodiment differs in that the Support piston 24 not on the retaining plate 40 but directly is supported on the shoe 14.
  • the support piston 24 has a Radial shoulder 70, the outer periphery of the retaining washer 40th surrounds and rests on the shoe 62.
  • the holding disc 40 associated annular end face 58 is formed, that they with a minimal gap to the retaining disc 40 stands, so that virtually no support force on the retaining disc 40 is introduced into the shoe 14.

Landscapes

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

Claims (7)

  1. Pompe haute pression, en particulier pompe à pistons radiaux comprenant au moins une unité de pompe (2) entraínée par un arbre moteur (22), comportant un carter volumétrique (6) dans lequel un piston (12) est guidé pour un déplacement axial et qui porte par l'intermédiaire d'un coulisseau (14) sur un anneau excentrique (16) qui est supporté par un piston de support (24) entourant le piston (12) à distance au moins par sections, qui est guidé dans le carter volumétrique (6) et est contraint dans une position d'appui, le mouvement de retrait du piston de support (24) pouvant être transmis au piston (12) par l'intermédiaire d'un dispositif de retenue (40), le piston de support (24) étant précontraint directement contre le coulisseau (14).
  2. Pompe haute pression selon la revendication 1, caractérisée en ce que le piston de support (24) comporte un épaulement d'entraínement (58) qui peut être mis en appui contre le dispositif de retenue (40) afin de transmettre le mouvement de retrait.
  3. Pompe haute pression selon la revendication 1 ou 2, caractérisée en ce que le dispositif de retenue est un disque de retenue (40) qui est relié au piston (12) par une partie en forme de moyeu (50) et dont la partie périphérique (56) s'appuie sur le piston de support (24) afin d'effectuer le retrait du piston.
  4. Pompe haute pression selon la revendication 2, caractérisée en ce que le piston de support (24) présente un étage radial dans la partie d'appui sur le coulisseau (14) et dans lequel plonge une partie périphérique (56) du disque de retenue (40).
  5. Pompe haute pression selon l'une des revendications précédentes, caractérisée en ce que le piston de support (24) comporte un logement (54) pour l'appui de la face frontale du coulisseau (14), un anneau de fixation (60) pour la fixation axiale du coulisseau (14) étant disposé dans une rainure circulaire de la paroi périphérique du logement (54).
  6. Pompe haute pression selon l'une des revendications 3 à 5, caractérisée en ce que le disque de retenue (40) est chassé par pression sur le piston (12).
  7. Pompe haute pression selon l'une des revendications précédentes, caractérisée en ce que la paroi du piston de support (24) présente au moins un passage (64, 66) pouvant être commandé en ouverture au cours du mouvement axial du piston de support (24) de sorte que du fluide sous pression peut être introduit dans un espace de pression (48) adjacent au coulisseau (24).
EP00100848A 1999-01-21 2000-01-17 Pompe haute pression Expired - Lifetime EP1022461B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19902324A DE19902324A1 (de) 1999-01-21 1999-01-21 Hochdruckpumpe
DE19902324 1999-01-21

Publications (3)

Publication Number Publication Date
EP1022461A2 EP1022461A2 (fr) 2000-07-26
EP1022461A3 EP1022461A3 (fr) 2001-01-03
EP1022461B1 true EP1022461B1 (fr) 2004-10-06

Family

ID=7894979

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00100848A Expired - Lifetime EP1022461B1 (fr) 1999-01-21 2000-01-17 Pompe haute pression

Country Status (2)

Country Link
EP (1) EP1022461B1 (fr)
DE (2) DE19902324A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10300144B3 (de) * 2003-01-07 2004-05-19 Siemens Ag Radialkolbenpumpe
DE102004053270A1 (de) * 2004-11-04 2006-05-11 Robert Bosch Gmbh Hochdruckpumpe, insbesondere für eine Kraftstoffeinspritzeinrichtung einer Brennkraftmaschine
DE102006042765A1 (de) * 2006-09-12 2008-03-27 Siemens Ag Niederhalter für Hochdruckkolben, Anordnung und Verwendung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19507295B4 (de) * 1995-03-02 2004-09-02 Siemens Ag Radialkolbenpumpe, insbesondere Kraftstoffpumpe für einen Verbrennungsmotor
DE59706937D1 (de) * 1996-07-01 2002-05-16 Rexroth Mannesmann Gmbh Vorrichtung zur Stabilisierung des Exzenterrings einer Radialkolbenpumpe
JPH1030525A (ja) * 1996-07-16 1998-02-03 Denso Corp 高圧サプライポンプ
DE19727294A1 (de) 1997-06-27 1999-01-07 Saarbergwerke Ag Behälter für Fluide
DE19943160A1 (de) * 1998-09-10 2000-03-16 Denso Corp Kraftstoffeinspritzpumpe

Also Published As

Publication number Publication date
DE19902324A1 (de) 2000-07-27
DE50008042D1 (de) 2004-11-11
EP1022461A3 (fr) 2001-01-03
EP1022461A2 (fr) 2000-07-26

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