EP0528254A2 - 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
EP0528254A2
EP0528254A2 EP92113259A EP92113259A EP0528254A2 EP 0528254 A2 EP0528254 A2 EP 0528254A2 EP 92113259 A EP92113259 A EP 92113259A EP 92113259 A EP92113259 A EP 92113259A EP 0528254 A2 EP0528254 A2 EP 0528254A2
Authority
EP
European Patent Office
Prior art keywords
control
piston
throttle
flow
pin
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
EP92113259A
Other languages
German (de)
English (en)
Other versions
EP0528254B1 (fr
EP0528254A3 (en
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.
  • a flow control piston which can be displaced in a housing bore is also provided, the end face of which has a connection to the pressure chamber.
  • Another end face of the flow control piston projects into a chamber which is connected to the 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 device cooperating with a throttle device according to the preamble of claim 1 is already known from DE 41 01 210.
  • a further piston is used as a throttle device in a stepped housing bore arranged parallel to the flow control piston, which piston can be adjusted by the pump pressure against the force of a spring.
  • In the cylindrical surface of this piston there is an opening which is connected to an outlet via an internal piston bore.
  • the step in the housing bore which acts as a control edge, allows the passage cross section of the opening to be more or less throttled when the piston is adjusted.
  • the operating current of the pump can therefore be limited as a function of the pump speed and thus of the delivery rate offered.
  • the residual current that is not required is regulated by the flow control piston controlled by a differential pressure to the pump inlet.
  • the control device is constructed so that the associated throttle device is accommodated as a cross-sectional narrowing bush in a housing bore leading to the consumer (Fig. 4).
  • the differential pressure generated by this throttle point also serves to control a flow control piston.
  • 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 application.
  • the novel throttle device located in the pressure outlet of the pump consists of a control pin fixed in the housing, which has a control contour.
  • the control pin In the area of the control contour, the control pin is surrounded by a piston which can be displaced against the force of a spring and which forms a variable control orifice with the latter.
  • the throttle device can also be inexpensively installed in 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 tapered control contour of the control pin is provided.
  • the control contour can also have a concave or convex shape.
  • the concave version gives a disproportionately large and the convex version a less than proportional curve.
  • a step-shaped control contour with a largest diameter in the rear area results in a step-wise falling characteristic.
  • the throttle device works without loss of performance, because only the consumer current is conducted through it.
  • 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 blades 5 are guided in radial slots of the rotor 4 and slide along them in a sealing ring 6 in a sealing manner.
  • a pressure plate 7 lies sealingly against 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 from the delivery chambers via pressure openings 8 of the pressure plate 8, which are likewise 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 invention consists in that the throttle device 20 is designed as a press-in 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 part 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 a 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 flow of the pump flows through 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 flows the flow at the front of the control collar 22 over to the outlet 40. The flow corresponds to the cross section shown between the control pin 28 and the throttle piston 32. The flow control piston 21 is adjusted slightly to the left, but the control collar 22 is not yet begins with the opening of the inlet channel 23.
  • Reference numerals 1 cover 21 piston 2nd casing 22 Tax union 3rd drive shaft 23 Inlet duct 4th rotor 24th feather 5 wing 25th Pipe fitting 6 Curve ring 26 Inlet channel 7 printing plate 27th Press-in cartridge 8th printing plate 28 Control pin 9 - 29 - 10th feather 30th Throttle piston 11 Suction connection 31 feather 12th Pressure chamber 32 attack 13 partially annular channel 33 Guide part 14 partially annular channel 34 tapered 15 Lower wing room Middle section 16 Lower wing room 35 room 17th Housing bore 36 Control line 17A Hole section 37 Ring groove (Pressure outlet) 38 Throttling point 18th Flow control valve 39 - 19th - 40 Outlet 20th Throttle device

Landscapes

  • 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)
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
DE4126217A DE4126217A1 (de) 1991-08-08 1991-08-08 Regeleinrichtung fuer verdraengerpumpen
DE4126217 1991-08-08

Publications (3)

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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0648931A1 (fr) * 1993-10-16 1995-04-19 LuK Fahrzeug-Hydraulik GmbH & Co. KG Arrangement de soupape
EP0846994A1 (fr) * 1996-12-09 1998-06-10 LuK Fahrzeug-Hydraulik GmbH & Co. KG Dispositif de régulation de débit pour une pompe hydraulique
WO2004015271A1 (fr) * 2002-07-24 2004-02-19 Zf Lenksysteme Gmbh Soupape de regulation de debit non proportionnelle pour pompe a cellules en ailettes

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4426652C1 (de) * 1994-07-15 1995-11-23 Luk Fahrzeug Hydraulik Ventilanordnung
DE19832719B4 (de) * 1998-07-21 2006-10-26 Zf Friedrichshafen Ag Flügelzellenpumpe

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

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0648931A1 (fr) * 1993-10-16 1995-04-19 LuK Fahrzeug-Hydraulik GmbH & Co. KG Arrangement de soupape
EP0846994A1 (fr) * 1996-12-09 1998-06-10 LuK Fahrzeug-Hydraulik GmbH & Co. KG Dispositif de régulation de débit pour une pompe hydraulique
US6012907A (en) * 1996-12-09 2000-01-11 Luk Fahrzeug-Hydraulik Gmbh & Co. Kg Flow-regulating arrangement for a hydraulic transporting device
WO2004015271A1 (fr) * 2002-07-24 2004-02-19 Zf Lenksysteme Gmbh Soupape de regulation de debit non proportionnelle pour pompe a cellules en ailettes

Also Published As

Publication number Publication date
EP0528254B1 (fr) 1996-11-13
DE59207514D1 (de) 1996-12-19
EP0528254A3 (en) 1993-10-20
DE4126217A1 (de) 1993-02-11

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