EP0528254B1 - Dispositif de régulation pour pompes à déplacement positif - Google Patents

Dispositif de régulation pour pompes à déplacement positif Download PDF

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Publication number
EP0528254B1
EP0528254B1 EP92113259A EP92113259A EP0528254B1 EP 0528254 B1 EP0528254 B1 EP 0528254B1 EP 92113259 A EP92113259 A EP 92113259A EP 92113259 A EP92113259 A EP 92113259A EP 0528254 B1 EP0528254 B1 EP 0528254B1
Authority
EP
European Patent Office
Prior art keywords
control
control rod
pressure
piston
throttle
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
EP92113259A
Other languages
German (de)
English (en)
Other versions
EP0528254A3 (en
EP0528254A2 (fr
Inventor
Reiner Mayer
Wolgang Hohl
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Publication of EP0528254A2 publication Critical patent/EP0528254A2/fr
Publication of EP0528254A3 publication Critical patent/EP0528254A3/de
Application granted granted Critical
Publication of EP0528254B1 publication Critical patent/EP0528254B1/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
    • 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 for positive displacement pumps, in particular for vane pumps, in which a pressure chamber is connected via a throttle device to an outlet connected to a consumer. Furthermore, a flow control piston which is displaceable in a housing bore is provided, the end face of which closes a bore section which has a connection to the pressure chamber. Another end face of the flow control piston projects into a space which is connected to an outlet downstream of the throttle device. The flow control piston releases a connection from the pressure chamber to a pump inlet channel as a function of a differential pressure acting on the two end faces.
  • a control pin with a control contour extends on the pressure outlet side into a stationary bushing, which is designed such that, together with an opening, there is a variable passage cross section.
  • a throttle device cooperating with a control device according to the preamble of claim 1 is already known from EP-A-26 586.
  • a flow control piston is provided, the displacement of which is used at the same time to regulate the consumer flow.
  • a conical control pin rests under spring force on its end face of the flow control piston, the control pin, depending on the cut-off position of the flow control piston, releasing with its conical area a more or less large ring cross section at a throttle opening of a bushing.
  • Such a throttle device must be installed directly behind the flow control piston because of the contact with it.
  • the dependence of the throttle device on the position of the flow control piston gives one pressure-dependent flow.
  • the flow rate characteristic which should not rise again after the cut-off point at approx. 1,000 rpm, therefore shows a more or less steep increase, depending on the outlet pressure.
  • the aim is to maintain a characteristic curve that is as falling or horizontal as possible, in particular for the supply of power steering systems, at all pressures.
  • a flow control piston is designed so that it not only connects the pressure side of the pump to a return line as a function of speed, but at the same time the pressure side via a variable ring cross-section, in accordance with the aforementioned document, connects to the consumer outlet.
  • the throttle bore which can be changed via a fixed control pin, is located in the flow control piston, so that this flow rate also receives a pressure dependency with the characteristic curve deviation explained above.
  • the invention has for its object to provide a control device which provides a pressure-independent, falling flow rate over the speed, the throttle device should be designed so that a variety of modifications of the flow rate characteristic are possible in a simple manner. Another essential requirement is to retrofit the throttle device into the pressure outlet of existing pumps with little construction, so that the characteristic curve can be modified depending on the intended use.
  • Claims 2 to 6 contain advantageous embodiments of the invention.
  • the function of the throttle device is independent of the flow control piston in the pressure outlet the pump, the control pin being fixed.
  • a piston that can be moved against the force of a spring by the differential pressure surrounds the control pin and forms the variable control orifice with it.
  • the throttle device can also be inexpensively installed in already existing pumps, it is advantageously carried out as a press-in or screw-in cartridge.
  • the simple construction also contributes to the fact that the control pin is held in a guide part pressed into the cartridge.
  • a conical control contour of the control pin is provided.
  • the control contour can also have a concave or convex shape.
  • tapered control contour produces a continuously falling characteristic curve
  • concave design results in a disproportionately low and the convex curve a disproportionately falling curve.
  • a step-shaped control contour with a largest diameter in the rear area results in a step-wise falling characteristic.
  • a drive shaft 3 is mounted in a housing 2 closed by a cover 1.
  • the drive shaft 3 carries a rotor 4 in a conventional manner on a spline.
  • Radially movable vanes 5 are guided in radial slots of the rotor 4 and slide along them sealingly in a cam ring 6.
  • a pressure plate 7 lies sealingly on the pump package consisting of rotor 4, blades 5 and cam ring 6.
  • Another pressure plate 8 is also due to the force of a spring 10 on the pump package.
  • the wings 5 enclose not visible delivery chambers between them, which are connected to a suction port 11.
  • the pumped pressure oil enters a pressure chamber 12 via the pressure openings 8 of the pressure plate 8, which are also not visible.
  • the pressure chamber 12 has part-annular channels 13 and 14 with under wing spaces 15 and 16 connection. This makes it possible to press the vanes passing through the pressure zone outwards into the cam ring 6.
  • a flow control valve 18 and a throttle device 20 are installed coaxially with one another.
  • a piston 21 of the flow control valve 18 controls, in a known manner, an inlet channel 23 with a control collar 22 Starting position, the control collar 22 rests against the throttle device 20 under the load of a spring 24.
  • the inlet channel 23 is closed by the control collar 22.
  • a bore section 17A to the right of the control collar, which also represents the pressure outlet, can be connected to the inlet channel 23.
  • In the bore section 17A there is a pipe screw connection 25 connected to a consumer, for example an auxiliary power steering system.
  • An inlet channel 26 connects the pressure chamber 12 to the bore section 17A.
  • the throttle device 20 is designed as a press-in or screw cartridge 27, which contains a control pin 28 and a throttle piston 30 surrounding the control pin.
  • the throttle piston 30 is supported in its starting position under the force of a spring on a stop 32.
  • the control pin 28 is held in a guide part 33 which also supports the spring 31.
  • Fig. 2 shows the guide member 33 as a narrow web which is pressed into the cartridge 27. In this way there is enough space on the side for oil to pass through.
  • the control pin 28 has a conical central section 34 as the control contour. Depending on the desired characteristic curve, however, the central section can also be stepped, convex or concave. Other control contours are also conceivable.
  • a space 35 receiving the spring 24 of the flow control piston 21 is connected to an outlet 40 of the pipe screw connection 25 via a control line 36 indicated by a broken line, an annular groove 37 and a throttle point 38.
  • the control device works as follows: The entire delivery flow of the pump flows via the inlet channel 26 into the bore section 17A. Up to the cut-off point at a pump speed of, for example 1 000 min -1 the flow flows past the front of the control collar 22 over to the outlet 40. The flow corresponds to the cross section drawn between the control pin 28 and the throttle piston 32. The flow control piston 21 adjusts slightly to the left, but the control collar 22 still does not begin with the opening of the inlet channel 23.

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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)

Claims (6)

  1. Dispositif de régulation pour des pompes de refoulement, notamment des pompes à ailettes, ayant les caractéristiques suivantes:
    - une chambre de pression (12) est couplée à une sortie (40) connectée à un utilisateur par l'intermédiaire d'un dispositif d'étranglement (20)
    - une face frontale d'un piston de régulation de flux (21) logé dans un alésage d'un boîtier (17) obture un fraisage (17A) adjacent à un alésage qui est en liaison avec la chambre de pression (12)
    - une autre face frontale du piston de régulation du flux (21) obture une chambre (35) qui est couplée à la sortie (40),
    - le piston de régulation du flux (21) libère un passage entre la chambre de pression (12) et un canal d'entrée (23) en fonction d'une pression différentielle agissant sur les deux faces frontales,
    - une goupille de régulation (28) s'étend sur le côté d'évacuation de la pression d'une douille fixe (27), le profil de commande de cette goupille étant agencé de telle manière qu'une section transversale de passage variable (fente de régulation) se forme en liaison avec une ouverture,
    caractérisé en ce que:
    - le dispositif d'étranglement est disposé dans le fraisage (évacuation de la pression) (17A) de la pompe, dans laquelle la goupille de régulation (28) est montée rigidement, de sorte que le dispositif d'étranglement est fonctionnellement indépendant du piston de régulation du flux (21);
    - un piston d'étranglement (30) coulissant actionné par la pression différentielle contre la force appliqué par un ressort (31) et disposé dans la douille fixe (27) entoure la goupille de régulation (28) et constitue avec cette dernière la fente de régulation variable.
  2. Dispositif de régulation selon la revendication 1, caractérisé en ce que le dispositif d'étranglement (20) est conformé en cartouche (27) engagée de force ou vissée.
  3. Dispositif de régulation selon la revendication 1, caractérisé en ce que la goupille de régulation (28) est maintenue dans une pièce de guidage (33) engagée de force dans ladite cartouche (27).
  4. Dispositif de régulation selon la revendication 1, caractérisé en ce que le profil de commande de la goupille de régulation (28) est conique.
  5. Dispositif de régulation selon la revendication 1, caractérisé en ce que le profil de commande de la goupille de régulation (28) a des sections de dimensions progressives.
  6. Dispositif de régulation selon la revendication 1, caractérisé en ce que le profil de commande de la goupille de régulation (28) est concave ou convexe.
EP92113259A 1991-08-08 1992-08-04 Dispositif de régulation pour pompes à déplacement positif Expired - Lifetime EP0528254B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4126217 1991-08-08
DE4126217A DE4126217A1 (de) 1991-08-08 1991-08-08 Regeleinrichtung fuer verdraengerpumpen

Publications (3)

Publication Number Publication Date
EP0528254A2 EP0528254A2 (fr) 1993-02-24
EP0528254A3 EP0528254A3 (en) 1993-10-20
EP0528254B1 true EP0528254B1 (fr) 1996-11-13

Family

ID=6437898

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92113259A Expired - Lifetime EP0528254B1 (fr) 1991-08-08 1992-08-04 Dispositif de régulation pour pompes à déplacement positif

Country Status (2)

Country Link
EP (1) EP0528254B1 (fr)
DE (2) DE4126217A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4335376A1 (de) * 1993-10-16 1995-04-20 Luk Fahrzeug Hydraulik Ventilanordnung
DE4426652C1 (de) * 1994-07-15 1995-11-23 Luk Fahrzeug Hydraulik Ventilanordnung
DE19652420A1 (de) * 1996-12-09 1998-06-10 Luk Fahrzeug Hydraulik Stromregelanordnung für eine hydraulische Fördereinrichtung
DE19832719B4 (de) * 1998-07-21 2006-10-26 Zf Friedrichshafen Ag Flügelzellenpumpe
DE10233579A1 (de) * 2002-07-24 2004-02-05 Zf Lenksysteme Gmbh Ventil für eine Pumpe

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB510737A (en) * 1937-08-23 1939-08-08 Maschb Ag Improvements in or relating to stepless discharge control of piston compressors
US3359913A (en) * 1965-10-22 1967-12-26 Chrysler Corp Hydraulic pump
GB1356906A (en) * 1971-10-08 1974-06-19 Ford Motor Co Rotary positive displacement pump
DE2704754A1 (de) * 1977-02-04 1978-08-17 Speck Kolbenpumpen Fabrik Ventilanordnung
US4251193A (en) * 1979-09-27 1981-02-17 General Motors Corporation Flow control valve

Also Published As

Publication number Publication date
DE59207514D1 (de) 1996-12-19
EP0528254A3 (en) 1993-10-20
DE4126217A1 (de) 1993-02-11
EP0528254A2 (fr) 1993-02-24

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