EP0221062B1 - Dispositif de regulation pour une pompe volumetrique, en particulier une pompe a palettes - Google Patents

Dispositif de regulation pour une pompe volumetrique, en particulier une pompe a palettes Download PDF

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Publication number
EP0221062B1
EP0221062B1 EP85903278A EP85903278A EP0221062B1 EP 0221062 B1 EP0221062 B1 EP 0221062B1 EP 85903278 A EP85903278 A EP 85903278A EP 85903278 A EP85903278 A EP 85903278A EP 0221062 B1 EP0221062 B1 EP 0221062B1
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EP
European Patent Office
Prior art keywords
throttle
bore
regulation device
flow regulating
regulating 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
Application number
EP85903278A
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German (de)
English (en)
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EP0221062A1 (fr
Inventor
Günther SEIDL
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ZF Friedrichshafen AG
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ZF Friedrichshafen AG
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Publication date
Application filed by ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP0221062A1 publication Critical patent/EP0221062A1/fr
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Publication of EP0221062B1 publication Critical patent/EP0221062B1/fr
Expired legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels

Definitions

  • the invention relates to a control device according to the kind described in the preamble of claim 1.
  • Vane pumps in particular are very often used for supplying pressurized oil to power steering systems.
  • To regulate the flow rate for power steering it is known to narrow the pressure channel in the area of the tapping point. This measure results in a higher flow velocity and thus a reduction in the static pressure on the rear side of the flow control piston.
  • the differential pressure between the two piston surfaces increases and the flow control piston experiences a speed-dependent opening tendency, so that the inlet opening in the flow return line is released to a corresponding extent.
  • a «falling characteristic of the vane pump is thus achieved; d. H. the volume throughput is not increased further according to the performance of the vane pump from a certain cut-off point, but may even be reduced.
  • control slide is designed as a bow spring which is attached to the front of the flow control piston.
  • the free end of the bow spring correspondingly covers the throttle bore (s).
  • the object of the present invention is to create even more possible variations in comparison to this previously known solution with regard to the characteristic curves.
  • the inventive arrangement of the throttle bore or throttle bores in cooperation with the throttle plate means that numerous characteristic curve variants can be set without problems. To do this, it is only necessary to provide corresponding control slides. Another advantage is that this configuration is very simple and safe. Since there is a parallel displacement of the throttle plate to the displacement of the flow control piston and no bow spring is necessary, there is no risk of permanent failure. Furthermore, the control slide with the throttle plate can be produced easily and inexpensively.
  • the throttle device and the flow control piston are parallel to each other and that the throttle bore is arranged in a peripheral wall of the throttle device.
  • control slide no longer has to be firmly attached to the end face, but can, for. B. may be arranged in a transverse bore in the flow control piston. This means that a rigid attachment to the piston is not necessary and the control slide can be easily assembled or disassembled. In this way, changes to the characteristic are still possible without problems, or the control device can be manufactured in series and then adapted to the respective requirements by means of a corresponding control slide.
  • the throttle device can have a cylindrical shape at least in the region of the throttle bore.
  • the throttle plate will advantageously be at least approximately designed as a segment of a hollow cylindrical shape, the inner diameter of which is at least approximately matched to the outer diameter of the throttle device.
  • the throttle plate of the control slide is always free of play on the throttle device and the distance between the throttle device and the flow control piston can also be designed with large tolerances
  • the throttle plate can be pressed against the peripheral wall of the throttle device by a spring.
  • it can lie behind a pin of the control slide in a transverse bore designed as a blind bore or it is clamped between the underside of the throttle plate and the peripheral wall of the flow control piston.
  • the throttle device can also have a collar at the front end facing the pressure chamber. This collar serves to facilitate assembly and secures at the same time also that the throttle plate is held on the throttle device. In this way, additional security measures are unnecessary.
  • throttle bore is offset circumferentially from the throttle plate, further characteristic curve characteristics can be set.
  • further characteristic curve characteristics can be set.
  • the throttle bore or the throttle bores can be given any shape.
  • the throttle plate, in coordination with the throttle bore can have any shape in plan view, so that there are corresponding possible variations.
  • the throttle device has, in addition to the throttle bore, a bore with an unchangeable cross section for the passage of the pressure medium.
  • control slide can be provided with a notch, a cam or the like in the area of its web between the throttle plate and the flow control piston. In this way, there is a point of attack for installation or removal.
  • the vane pump is essentially of a known structure, which is why only the parts essential to the invention are shown and described here.
  • the pump has a rotor with wings in the usual way, the rotor being arranged between a front end plate (not shown) and a rear pressure plate 1. Behind the pressure plate 1 there is a pressure chamber 24 which is connected to pressure kidneys (not shown) via pressure bores.
  • the pressurized pressure medium passes after passing through a throttle device 2 to an outlet opening 3, from which a line to a consumer, for. B. to power steering.
  • the throttle device 2 has a throttle insert in the form of a cylinder.
  • a throttle bore 4 and a fixed bore 5 are arranged in the peripheral wall.
  • the bores 4 and 5 are used to connect the pressure chamber 2 to the outlet opening 3, the throttle insert 2 being provided with a longitudinal bore 6 for this purpose.
  • a flow control piston 7 protrudes into the pressure chamber 24 with its front face, the back of the pressure plate 1 also forming an end stop.
  • the flow control piston 7 is arranged displaceably in a bore in the housing or the cover of the vane pump.
  • the rear piston surface of the flow control piston 7 lies in a spring chamber 8 of the bore, in which a spring 9 is arranged, which exerts a closing force on the flow control piston 7 in the direction of the pressure plate 1.
  • the spring chamber 8 is connected via a transverse bore 10 to a pressure chamber 11, which is located behind the throttle device 2.
  • the flow control piston 7 is provided with a control edge 12, behind which there is an inlet opening 13 with an adjoining flow return line 14.
  • the throttle device 2 and the flow control piston 7 are parallel to each other.
  • the center line of the throttle bore 4 is perpendicular to the longitudinal axis of the flow control piston 7.
  • a control slide 15 consists of a throttle plate 16 and a web 17.
  • the web 17 is mounted in a transverse bore 18 of the flow control piston 7.
  • the transverse bore 18 is designed as a blind bore and a spring 19 is stretched between the bottom of the blind bore 18 and the rear end of the web 17. In this way, the throttle plate is always pressed against the peripheral wall of the throttle device 2.
  • the throttle plate 16 forms a segment of a hollow cylindrical shape, the inner diameter of which is at least approximately matched to the outer diameter of the throttle device. In this way, a good seal or throttling is provided. Furthermore, the control slide 15 also forms an anti-rotation device for the flow control piston 7.
  • the control slide can be simple and inexpensive, for. B. from pressure or injection molding. Also different materials, such as. B. plastic, possible.
  • a plurality of throttle bores can optionally also be arranged one behind the other in the longitudinal direction or in the circumferential direction in the throttle device 2.
  • Several throttle bores arranged one behind the other or next to one another can also be combined to form an elongated hole.
  • Throttle bores can also be offset on the circumference of the throttle plate 16. In this way, partial coverage may be possible and thus also a certain independence from the piston travel.
  • a pressure kidney 20, via which the pressure chamber 24 is supplied with pressure oil is indicated by dashed lines.
  • the cylindrical throttle device 2 has a collar 21 at the front end projecting into the pressure chamber 24, which collar forms a stop for the pressure plate 16. Furthermore, the web 17 of the control slide 15 can be provided in its free area with a notch 22 (shown in dashed lines in FIG. 1). In this way, a point of attack for easier assembly and disassembly is formed.
  • FIGS. 4-8 are only to be regarded as part of a multitude of possibilities. Depending on the application and the desired curve, there are numerous possible variations.
  • the bore 5 serves to improve the cold start behavior. In this case it works alone in the open position and the risk of cavitation is reduced due to the low flow rate.
  • a continuous transverse bore can optionally also be used. In this way there is symmetry and no assembly errors can occur.
  • the spring 19 is then arranged between the underside of the throttle plate 16 and the peripheral wall of the flow control piston 7 above the web 17.
  • the longitudinal bore 6 in the throttle device can be dimensioned such that it determines the cut-off point. All that is required for this is that the flow cross sections of the throttle bore 4 and the bore 5 together are larger than the flow cross section of the longitudinal bore 6.
  • this hole can also be used to influence the characteristic curve itself. Depending on their size, they can influence the "falling" tendency of the characteristic curves.
  • control slide 15 has a base part 25 with a thread in the lower region debolzen 26.
  • the web 17 is also inserted into a transverse bore of the base part 25, or it is integrally formed with this.
  • the front end face of the flow control piston 7 has a threaded hole into which the threaded bolt 26 of the control slide 15 can be screwed.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)

Abstract

Un dispositif de régulation pour une pompe volumétrique, en particulier une pompe à cellules semi-rotative, est doté d'un piston de régulation de l'écoulement (7) dont la surface de piston avant est en liaison avec un espace de pression (24) avant un dispositif d'étranglement (2) présentant au moins un trou d'étranglement (4) de section transversale d'ouverture modifiable grâce à un coulisseau de commande (15) fixé au piston de régulation de l'écoulement (7) et dont la surface de piston arrière est en liaison avec une chambre de pression (11) derrière le dispositif d'étranglement (2); il est également doté d'une canalisation de retour d'écoulement de transport (14) dont l'ouverture d'admission (13) est libérée en fonction de la position du piston de régulation de l'écoulement (7). L'ouverture d'entrée du trou d'étranglement (4) est au moins approximativement perpendiculaire à l'axe longitudinal du piston de régulation de l'écoulement (7). Le coulisseau de commande (15) comporte une plaque d'étranglement (16) déplaçable parallèlement à l'axe longitudinal du piston de régulation de l'écoulement (7) sur l'ouverture d'entrée du trou d'étranglement (4).

Claims (17)

1. Dispositif de régulation pour une pompe volumétrique, en particulier une pompe à palettes, avec un piston de régulation de débit (7) dont la surface frontale de piston est reliée à une chambre de pression (24), avant un dispositif d'étranglement (2) qui présente au moins un orifice d'étranglement (4) variable dans la section transversale de l'ouverture, au moyen d'une coulisse de commande (15) fixé sur le piston de régulation de débit (7), et dont la surface arrière du piston est reliée à une chambre de pression (11) derrière le dispositif d'étranglement (2), et avec une conduite de refoulement du débit (14) dont l'orifice d'alimentation (13) est libéré en fonction de la position du piston de régulation de débit, ce même piston étant disposé dans un alésage à côté du dispositif d'étranglement (2), caractérisé en ce que l'axe de l'orifice d'étranglement (4) est au moins approximativement perpendiculaire à l'axe longitudinal du piston de régulation de débit (7) et en ce que la coulisse de commande (15) est équipé d'une plaque d'étranglement (16) qui peut coulisser parallèlement à l'axe longitudinal du piston de régulation de débit (7) au niveau de l'entrée de l'orifice d'étranglement (4).
2. Dispositif de régulation selon revendication 1, caractérisé en ce que le dispositif d'étranglement (2) est parallèle au piston de régulation de débit (7) et l'orifice d'étranglement (4) est disposé en direction périphérique du dispositif d'étranglement (2).
3. Dispositif de régulation selon revendication 2, caractérisé en ce que le dispositif d'étranglement (2) a une forme cylindrique au moins au niveau de l'orifice d'étranglement (4).
4. Dispositif de régulation selon revendication 3, caractérisé en ce que la plaque d'étranglement (16) possède un segment de forme au moins approximativement cylindrique et creuse, dont le diamètre intérieur correspond à peu de chose près au diamètre extérieur du dispositif d'étranglement (2).
5. Dispositif de régulation selon une des revendications 1-4, caractérisé en ce que la plaque d'étranglement (16) est pourvue d'une traverse (17) qui loge dans un perçage transversal (18) du piston de régulation de débit (7).
6. Dispositif de régulation selon revendication 5, caractérisé en ce que un ressort (19) appuie contre le piston de régulation de débit (7), pressant la plaque d'étranglement (16) contre la paroi périphérique du dispositif d'étranglement (2).
7. Dispositif de régulation selon revendication 6, caractérisé en ce que le ressort (19) est placé dans l'alésage transversal finissant en trou borgne (18), derrière la traverse (17).
8. Dispositif de régulation selon revendication 6 caractérisé en ce que le ressort (19) est serré entre la partie inférieure de la plaque d'étranglement (16) et la paroi périphérique du piston de régulation de débit (7).
9. Dispositif de régulation selon une des revendications 1-8, caractérisé en ce que le dispositif d'étranglement (2) présente un épaulement (21) à l'extrémité frontale, orientée vers la chambre de pression (24).
10. Dispositif de régulation selon une des revendications 1-9, caractérisé en ce que l'orifice d'étranglement (4) est, en direction périphérique, décalé par rapport à la plaque d'étranglement (16).
11. Dispositif de régulation selon une des revendications 1-10, caractérisé en ce que l'orifice d'étranglement (4) a la forme d'un alésage oblong.
12. Dispositif de régulation selon une des revendications 1-11, caractérisé en ce que la plaque d'étranglement (16), vue de dessus, forme un rectangle.
13. Dispositif de régulation selon une des revendications 1-12, caractérisé en ce que l'arête frontale (23) de la plaque d'étranglement (16) s'écarte de la droite, par rapport au sens de fermeture, sous la forme d'évidements, d'entailles, de creux, d'arrondis, etc...
14. Dispositif de régulation selon une des revendications 1-13, caractérisé en ce que le dispositif d'étranglement (2) est pourvu d'un alésage (5), en plus de l'orifice d'étranglement (4), dont la section transversale est constante, permettant le passage du fluide de pression.
15. Dispositif de régulation selon revendication 5, caractérisé en ce que la traverse (17) présente une encoche, un ergot ou un équivalent dans la zone libre entre la plaque d'étranglement (16) et le piston de régulation de débit (7).
16. Dispositif de régulation selon une des revendications 1-15, caractérisé en ce que le dispositif d'étranglement (2) est pourvu d'un alésage longitudinal (6) dans lequel l'orifice d'étranglement (4) et éventuellement l'autre alésage (5) débouchent, et en ce que l'alésage longitudinal (6) est dimensionné de façon à définir le point de coupure.
17. Dispositif de régulation selon une des revendications 1-16, caractérisé en ce que la coulisse de commande (15) présente dans la partie inférieure une pièce de base (25) avec un goujon fileté (26), au moyen de laquelle il est relié, en tant qu'unité séparée réglable et réajustable au piston de régulation de débit (7).
EP85903278A 1984-07-12 1985-07-06 Dispositif de regulation pour une pompe volumetrique, en particulier une pompe a palettes Expired EP0221062B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
WOPCT/EP84/00214 1984-07-12
EP8400214 1984-07-12

Publications (2)

Publication Number Publication Date
EP0221062A1 EP0221062A1 (fr) 1987-05-13
EP0221062B1 true EP0221062B1 (fr) 1989-03-15

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85903278A Expired EP0221062B1 (fr) 1984-07-12 1985-07-06 Dispositif de regulation pour une pompe volumetrique, en particulier une pompe a palettes

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EP (1) EP0221062B1 (fr)
DE (1) DE3524413A1 (fr)
WO (1) WO1986000671A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4101210A1 (de) * 1990-01-17 1991-07-18 Zahnradfabrik Friedrichshafen Regeleinrichtung fuer verdraengerpumpen

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3909159A1 (de) * 1988-03-25 1989-10-05 Zahnradfabrik Friedrichshafen Regeleinrichtung fuer verdraengerpumpen
JP2852476B2 (ja) * 1990-07-20 1999-02-03 ツァーンラトファブリック フリードリッヒシャーフェン アクチェンゲゼルシャフト 排油ポンプの制御機構
DE102005043253B4 (de) * 2005-09-09 2014-09-04 Zf Lenksysteme Gmbh Verfahren zum Herstellen einer Verdrängerpumpe und eine danach hergestellte Verdrängerpumpe

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211948A1 (de) * 1982-03-31 1983-10-20 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Regelbare fluegelzellenpumpe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1653503B2 (de) * 1966-07-01 1976-12-02 Lucas Industries Ltd., Birmingham (Grossbritannien) Vorrichtung zur regelung der foerdermenge einer hydrostatischen verstellpumpe
FR2194241A5 (fr) * 1972-07-20 1974-02-22 Sonnberger Felix
US4361166A (en) * 1980-01-24 1982-11-30 Toyoda Koki Kabushiki Kaisha Flow controlling apparatus for power steering, operating fluid

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3211948A1 (de) * 1982-03-31 1983-10-20 Zahnradfabrik Friedrichshafen Ag, 7990 Friedrichshafen Regelbare fluegelzellenpumpe

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4101210A1 (de) * 1990-01-17 1991-07-18 Zahnradfabrik Friedrichshafen Regeleinrichtung fuer verdraengerpumpen
DE4101210C2 (de) * 1990-01-17 1998-10-08 Zahnradfabrik Friedrichshafen Regeleinrichtung für Verdrängerpumpen

Also Published As

Publication number Publication date
EP0221062A1 (fr) 1987-05-13
WO1986000671A1 (fr) 1986-01-30
DE3524413A1 (de) 1986-01-23

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