DE102011010834A1 - Adjusting device for adjustment of delivery volume of positive displacement pump, has actuating medium formed by electrically operable valve control gear, where control valve is applied with adjusting force in ballast position - Google Patents

Adjusting device for adjustment of delivery volume of positive displacement pump, has actuating medium formed by electrically operable valve control gear, where control valve is applied with adjusting force in ballast position

Info

Publication number
DE102011010834A1
DE102011010834A1 DE201110010834 DE102011010834A DE102011010834A1 DE 102011010834 A1 DE102011010834 A1 DE 102011010834A1 DE 201110010834 DE201110010834 DE 201110010834 DE 102011010834 A DE102011010834 A DE 102011010834A DE 102011010834 A1 DE102011010834 A1 DE 102011010834A1
Authority
DE
Germany
Prior art keywords
control
control valve
switching position
positive displacement
displacement pump
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
DE201110010834
Other languages
German (de)
Inventor
Jürgen Ernst
Robert Greunz
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.)
Audi AG
Original Assignee
Audi 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 Audi AG filed Critical Audi AG
Priority to DE201110010834 priority Critical patent/DE102011010834A1/en
Publication of DE102011010834A1 publication Critical patent/DE102011010834A1/en
Application status is Ceased legal-status Critical

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/002Hydraulic systems to change the pump delivery
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/02Stopping, starting, unloading or idling control
    • F04B49/03Stopping, starting, unloading or idling control by means of valves

Abstract

The adjusting device (4) has an actuating medium formed by an electrically operable valve control gear (11). A control valve (5) is applied with an adjusting force in a ballast position (C), and with another adjusting force in another ballast position (D). The former ballast position is a switching position (A) of the control valve, where the latter ballast position is another switching position (B) of the control valve.

Description

  • The invention relates to an adjusting device for the adjustment of the delivery volume of a positive displacement pump, with a control valve which is adapted to selectively control a switching element of the positive displacement pump with a first or a second pressure level, wherein the control valve adjustable by an actuating device between a first and a second switching position is, and wherein the first switching position is associated with the first pressure level and the second switching position associated with the second pressure level.
  • From the DE 10 2007 033 146 A1 an adjusting valve for the adjustment of the delivery volume of a positive displacement pump is known, which is designed to control a switching element of a positive displacement pump with two different pressure levels. The adjustment valve is designed as a proportional valve and includes a solenoid adjustment, which is switched with a pulse width modulated electrical control signal. However, this control is relatively expensive.
  • The object of the invention is to avoid this disadvantage and to enable a cost-effective adjustment of the delivery volume of a positive displacement pump.
  • According to the invention this is achieved in that the actuating device is formed by an electrically actuated ballast valve which acts on the control valve in a first Vorstellstellung with a first adjusting and in a second Vorschaltstellung with a second adjusting, wherein the first Vorschaltstellung the first switching position of the control valve and the second Vorschaltstellung the second switching position of the control valve is assigned, and wherein preferably the first and / or second adjusting force can be applied by a preferably hydraulic control medium. In a particularly advantageous embodiment of the invention it is provided that the control valve has a valve housing axially displaceably mounted control piston, which has at least a first and at least a second pressure application surface for the control medium, wherein the first pressure application surface in at least the first Vorschaltstellung the Vorschaltventils and the second pressure application surface in the second Vorschaltstellung with the control medium can be acted upon.
  • The electromagnetically actuated feed valve thus connects the two hydraulically active pressure application surfaces of the control piston. In this case, one of the two pressure application surfaces may be formed as an annular surface and the other as an end surface, wherein the two pressure application surfaces may be arranged separately from each other on the control piston.
  • In order to enable a rapid response, designed as an annular surface first pressure application surface is acted upon in both the first and in the second Vorschaltstellung with control pressure. In the second Vorschaltstellung the pilot valve in addition to the first pressure application surface and the second pressure application surface is acted upon by the control pressure. This causes an increase in the control pressure and subsequently a drop in the pump delivery pressure to the lower pressure level, since the control piston and thus the control member of the positive displacement pump is switched to the second switching position.
  • In a particularly simple embodiment, it is provided that the upstream valve is connected on the input side to the pressure side of the positive displacement pump.
  • In a particularly advantageous embodiment, it is provided that a throttle device is arranged between the control valve and the switching element of the positive displacement pump. The throttle device has, for example, a cross section of 1.5 mm to 4 mm and causes an increase in the filling time and the discharge time of the pressure chamber of the switching element of the positive displacement pump. This ensures that the control quality meets the requirements of, for example, an internal combustion engine, and that delivery pressure pulsations can be kept as low as possible.
  • In a further embodiment of the invention can be provided that the control piston has at least one cylindrical shell portion which closes at axial displacement of the control piston a Abregelbohrung in the valve housing in at least one switching position and opens in at least one other switching position, wherein - viewed in the direction of the axis of the control piston - The diameter of the Abregelbohrung is greater than the width of the lateral surface, wherein preferably adjacent to the lateral surface at least one chamfering is arranged, wherein preferably the lateral surface is flanked on both sides by chamfers. This measure also causes an increase in the filling and emptying time and ensures that delivery pressure pulsations can be kept as low as possible.
  • The invention will be explained in more detail below with reference to FIGS.
  • Show it 1 a circuit diagram of an adjusting device according to the invention for the adjustment of the delivery volume of a positive displacement pump, 2 a control valve of the adjusting in one Longitudinal section 3 the detail III out 2 and 4 the control valve in section along the line IV-IV in 3 ,
  • A trained as Außenenzradradpumpe positive displacement pump 1 has a switching element 2 for adjusting the funding volume. The adjustment of the delivery volume takes place in the external gear pump of the example by adjusting the tooth engagement length of the two gears 1a . 1b , wherein by applying a pressure chamber 3 with a control medium the gear 1b against a return spring 14 can be moved axially. Is in 1 the gear 1b shifted to the right, so there is set a first pressure level p 1, it is moved to the left, so there is set a second pressure level p 2, which is less than the first pressure level p. 1
  • The adjusting device 4 for the positive displacement pump 1 has a control valve 5 on, which is adjustable between a first and a second switching position A, B. The adjustment takes place in that a control piston 6 of the control valve 5 in a housing 7 axially by hydraulic pressurization of a first and a second pressure application surface 8th . 9 against the force of a return spring 10 is moved. The pressurization is via a pilot valve 11 controlled, its input 12a . 12b with the pressure side 13 the positive displacement pump 1 fluidly connected. The electrically actuated pilot valve 11 has a first and a second Vorschaltstellung C, D, wherein the first Vorschaltstellung C of the first switching position A of the control valve 5 and the second Vorschaltstellung D of the second switching position B of the control valve 5 assigned. In the in 1 shown switching position C is only the pressure application surface 8th acted upon by switch pressure. In the second ballast position D, both the first and the second pressure application surface 8th . 9 pressurized with pilot pressure, causing the control piston 6 of the control valve 5 is moved to the second switching position B. In this second switching position B, the pressure chamber 3 with the pressure side 13 the positive displacement pump 1 fluidly connected, whereby the switching element 2 against the force of the return spring 14 is deflected. Will the pilot valve 11 back in his in 1 shown brought first control position C, so also switches the control valve 5 in its first switching position A, since only the first pressure application surface 8th is acted upon by the control medium. This switching movement is caused by the return spring 10 caused. In the first switching position A, the control line 15 with a tank 17 connected.
  • To keep delivery pressure pulsations as low as possible, is in the control line 15 a throttle device 16 arranged, wherein the diameter of the throttle body may be, for example, between 1.5 mm and 4 mm. Through the throttle device 16 becomes the filling time and the emptying time of the pressure chamber 3 increases, whereby Förderdruckpulsationen can be effectively reduced.
  • In 2 is a designed as a control oil pump positive displacement pump 1 shown, wherein in a housing 7 both an external gear pump and a control valve 5 with a control piston 6 is arranged. The control piston 6 is in the case 7 mounted axially displaceable and has hydraulic first and second pressure application surfaces 8th . 9 on, which to corresponding pressure chambers 8a and 9a limits. In the first pressure room 8a opens a first Vorschaltleitung 8b and in the second pressure chamber 9a a second ballast line 9b , where the two Vorschaltleitungen 8b and 9b with the pilot valve 11 are connected. The first pressure room 8a is in the first, as well as in the second Vorschaltstellung C, D with the pressure side 13 the positive displacement pump 1 connected. The second pressure chamber 9a is only in the second Vorstellstellung D with the pressure side 13 connected. In this second switching position D, the control piston 6 by the control pressure in the Vorschaltleitungen 8b . 9b against the force of the return spring 10 in the second switching position B of the control valve 5 postponed. 2 shows the control valve 5 in an intermediate position in which the Abregelbohrung 19 , which via a control line 20 to the spring chamber 21 of the switching element 2 is connected, as well as the Abregelbohrung 22 , which with the pressure chamber 3 leading control line 15 is connected, each by a cylindrical outer surface 23 . 24 of the control piston 6 closed is.
  • In order to achieve a high control quality with low delivery pressure pulsations during the switching process, that is in the direction of the axis 6a of the control piston 6 measured width b of the lateral surface 23 . 24 less than the diameter d of the corresponding control bore 19 . 22 as in the 3 and 4 is shown. The lateral surfaces 23 . 24 are thereby by Anphasungen 25 flanked. These measures ensure that in intermediate positions control medium between the control lines 18 . 20 such as 18 and 15 can flow, resulting in a smoother adjustment of the displacement of the positive displacement pump 1 allows.
  • QUOTES INCLUDE IN THE DESCRIPTION
  • This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
  • Cited patent literature
    • DE 102007033146 A1 [0002]

Claims (6)

  1. Adjusting device ( 4 ) for the adjustment of the delivery volume of a positive displacement pump, with a control valve ( 5 ), which is adapted to a switching device ( 2 ) of the positive displacement pump ( 1 ) optionally with a first pressure level (p 1 ) or a second pressure level (p 2 ) to control, wherein the control valve ( 5 ) by an actuating device between a first and a second switching position (A, B) is adjustable, and wherein the first switching position (A) the first pressure level (p 1 ) and the second switching position (B) is associated with the second pressure level (p 2 ) , characterized in that the actuating device by an electrically actuated ballast valve ( 11 ) is formed, which the control valve ( 5 ) in a first Vorschaltstellung (C) with a first adjusting force and in a second Vorschaltstellung (D) acted upon by a second adjusting, wherein the first Vorschaltstellung (C) of the first switching position (A) of the control valve ( 5 ) and the second Vorschaltstellung (D) of the second switching position (B) of the control valve ( 5 ), and wherein preferably the first and / or second adjusting force can be applied by a preferably hydraulic control medium.
  2. Adjusting device ( 4 ) according to claim 1, characterized in that the control valve ( 5 ) one in a housing ( 7 ) has axially displaceably mounted control piston, which at least a first and at least one second pressure application surface ( 8th . 9 ) for the control medium, wherein the first pressure application surface ( 8th ) in at least the first Vorschaltstellung (C) of the Vorschaltventils ( 11 ) and the second pressure application surface ( 9 ) can be acted upon in the second Vorschaltstellung (D) with the control medium.
  3. Adjusting device ( 4 ) according to claim 1 or 2, characterized in that the pilot valve ( 11 ) on the input side with the pressure side ( 13 ) of the positive displacement pump ( 1 ) connected is.
  4. Adjusting device ( 4 ) according to one of claims 1 to 3, characterized in that between the control valve ( 5 ) and the switching element ( 2 ) of the positive displacement pump ( 1 ) in at least one control line ( 15 ) a throttle device ( 16 ) is arranged.
  5. Adjusting device ( 4 ) according to one of claims 1 to 4, characterized in that the control piston ( 6 ) of the control valve ( 5 ) at least one cylindrical lateral surface ( 23 . 24 ), which in axial displacement of the control piston ( 6 ) a Abregelbohrung ( 19 . 22 ) in the housing ( 7 ) closes in at least one switching position (A, B) and opens in at least one other switching position (B, A), wherein - in the direction of the axis ( 6a ) of the control piston ( 6 ) - the diameter (d) of the Abregelbohrung ( 19 . 22 ) is greater than the width (b) of the lateral surface ( 23 . 24 ).
  6. Adjusting device ( 4 ) according to claim 5, characterized in that adjacent to the lateral surface ( 23 . 24 ) at least one phasing ( 25 ) is arranged, wherein preferably the lateral surface ( 23 . 24 ) on both sides of Anphasungen ( 25 ) is flanked.
DE201110010834 2011-02-10 2011-02-10 Adjusting device for adjustment of delivery volume of positive displacement pump, has actuating medium formed by electrically operable valve control gear, where control valve is applied with adjusting force in ballast position Ceased DE102011010834A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE201110010834 DE102011010834A1 (en) 2011-02-10 2011-02-10 Adjusting device for adjustment of delivery volume of positive displacement pump, has actuating medium formed by electrically operable valve control gear, where control valve is applied with adjusting force in ballast position

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110010834 DE102011010834A1 (en) 2011-02-10 2011-02-10 Adjusting device for adjustment of delivery volume of positive displacement pump, has actuating medium formed by electrically operable valve control gear, where control valve is applied with adjusting force in ballast position

Publications (1)

Publication Number Publication Date
DE102011010834A1 true DE102011010834A1 (en) 2012-08-16

Family

ID=46579557

Family Applications (1)

Application Number Title Priority Date Filing Date
DE201110010834 Ceased DE102011010834A1 (en) 2011-02-10 2011-02-10 Adjusting device for adjustment of delivery volume of positive displacement pump, has actuating medium formed by electrically operable valve control gear, where control valve is applied with adjusting force in ballast position

Country Status (1)

Country Link
DE (1) DE102011010834A1 (en)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10104298A1 (en) * 2000-05-11 2001-11-15 Mannesmann Rexroth Ag Hydraulic control device for damping travel vibrations of mobile work apparatus involves hydro-cylinder supporting work tool, cylinder chambers of which are connectable via control valve arrangement with pressure medium source or tank
DE10242866A1 (en) * 2001-09-25 2003-04-24 Avl List Gmbh Variable valve train
DE10237801A1 (en) * 2002-01-12 2003-07-31 Dieter Voigt Device for regulating the pressure of hydraulic pumps
DE10306963A1 (en) * 2002-02-19 2003-08-28 Gen Motors Corp Line pressure control for a continuously variable transmission
DE102005053699A1 (en) * 2004-11-18 2006-05-24 General Motors Corp., Detroit Hydraulic control system for a continuously variable transmission mechanism
DE102006018434A1 (en) * 2006-04-20 2007-10-25 Zf Friedrichshafen Ag Mobile vehicle`s drive, has internal combustion engine and hydraulic engine connectable with drive of vehicle wheel, and hydraulic pump and engine operated in closed cycle, where engine and pump are connected with inlet and return pipe
DE102007033146A1 (en) 2007-07-13 2009-01-15 Schwäbische Hüttenwerke Automotive GmbH & Co. KG Adjustment valve for adjusting the delivery volume of a positive displacement pump

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10104298A1 (en) * 2000-05-11 2001-11-15 Mannesmann Rexroth Ag Hydraulic control device for damping travel vibrations of mobile work apparatus involves hydro-cylinder supporting work tool, cylinder chambers of which are connectable via control valve arrangement with pressure medium source or tank
DE10242866A1 (en) * 2001-09-25 2003-04-24 Avl List Gmbh Variable valve train
DE10237801A1 (en) * 2002-01-12 2003-07-31 Dieter Voigt Device for regulating the pressure of hydraulic pumps
DE10306963A1 (en) * 2002-02-19 2003-08-28 Gen Motors Corp Line pressure control for a continuously variable transmission
DE102005053699A1 (en) * 2004-11-18 2006-05-24 General Motors Corp., Detroit Hydraulic control system for a continuously variable transmission mechanism
DE102006018434A1 (en) * 2006-04-20 2007-10-25 Zf Friedrichshafen Ag Mobile vehicle`s drive, has internal combustion engine and hydraulic engine connectable with drive of vehicle wheel, and hydraulic pump and engine operated in closed cycle, where engine and pump are connected with inlet and return pipe
DE102007033146A1 (en) 2007-07-13 2009-01-15 Schwäbische Hüttenwerke Automotive GmbH & Co. KG Adjustment valve for adjusting the delivery volume of a positive displacement pump

Similar Documents

Publication Publication Date Title
EP2821619B1 (en) Connecting rod for a two-stage variable compression
DE102012112461A1 (en) Reversing valve for controlling engine oil of internal combustion engine i.e. petrol engine, in motor car, has groove connecting first and second hydraulic fluid lines to vent channel in first and second switch positions, respectively
DE102010016037A1 (en) Switchover valve, particularly for controlling hydraulic fluid flow of internal combustion engine, has ballpoint mechanism, which is engaged by applying actuating impulse to actuating unit of ballpoint mechanism
EP1584822A3 (en) Hydraulic control system and construction machine
DE10325070A1 (en) Control valve for operating hydraulic coupling has sliding valve element in slide valve bore and pressure transition region formed by reduced diameter section on surface of sliding element
WO2001053693A3 (en) Valve for controlling liquids
DE102011010566B4 (en) Dekompressionsschaltventil
US9890702B2 (en) Switching valve and internal combustion engine having such a switching valve and a method for a switching valve
US6786205B2 (en) Hydraulically intensified high pressure fuel system for common rail application
US20040025845A1 (en) Fuel injection device with pressure intensifying device, and pressure intensifying device
DE102007012967B4 (en) Valve, in particular cartridge valve, with integrated non-return valve
JP5136533B2 (en) Electromagnetic pump
JP4015956B2 (en) Power steering device
WO2004102011A1 (en) Valve
JP5625054B2 (en) Hydraulic valve for use in the control module of automatic transmission
US8397759B2 (en) Electromagnetic spool valve
DE102004005790B4 (en) Hydraulic control and a transmission
US20090133761A1 (en) Control valve unit with alternating stop
DE102015204061A1 (en) Variable displacement pump
DE112007001455T5 (en) Fluid controlled valve
DE102012105676A1 (en) Device and method for controlling hydraulic pressure of an automatic transmission
JP2010535670A (en) Brake system for vehicles
US20110067771A1 (en) Spool valve
KR101934686B1 (en) Gate-type pressure regulating valve with improved damping behavior
JP5316263B2 (en) Solenoid valve

Legal Events

Date Code Title Description
R163 Identified publications notified
R012 Request for examination validly filed

Effective date: 20120712

R002 Refusal decision in examination/registration proceedings
R003 Refusal decision now final