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EP3724504B1 - Verstellbare flügelzellenpumpe mit schmiermittel - Google Patents

Verstellbare flügelzellenpumpe mit schmiermittel Download PDF

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Publication number
EP3724504B1
EP3724504B1 EP17816761.5A EP17816761A EP3724504B1 EP 3724504 B1 EP3724504 B1 EP 3724504B1 EP 17816761 A EP17816761 A EP 17816761A EP 3724504 B1 EP3724504 B1 EP 3724504B1
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EP
European Patent Office
Prior art keywords
pump
pressure
control ring
pilot chamber
lubricant
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.)
Active
Application number
EP17816761.5A
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English (en)
French (fr)
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EP3724504A1 (de
Inventor
Carmine Cuneo
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.)
Pierburg Pump Technology GmbH
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Pierburg Pump Technology GmbH
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Filing date
Publication date
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Publication of EP3724504A1 publication Critical patent/EP3724504A1/de
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Publication of EP3724504B1 publication Critical patent/EP3724504B1/de
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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
    • F04C2/00—Rotary-piston machines or pumps
    • F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
    • F04C2/34—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members
    • F04C2/344—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in groups F04C2/08 or F04C2/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
    • 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
    • F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
    • F04C14/22—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members
    • F04C14/223—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by changing the eccentricity between cooperating members using a movable cam
    • 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
    • F04C2270/00—Control; Monitoring or safety arrangements
    • F04C2270/18—Pressure
    • F04C2270/185—Controlled or regulated

Definitions

  • the invention is directed to a variable lubricant vane pump for providing pressurized lubricant, in particular a mechanical variable displacement lubricant vane pump for providing pressurized lubricant for an internal combustion engine.
  • variable lubricant vane pump is mechanically driven by the engine, for example via a gear or belt, and is fluidically coupled to the engine for pumping the pressurized lubricant to and through the engine.
  • the pump outlet pressure or the lubricant gallery pressure in the engine needs to be controlled and stabilized to a set pressure value.
  • WO 2015/074700 A1 discloses a typical variable lubricant vane pump for providing pressurized lubricant for an internal combustion engine.
  • the variable lubricant vane pump is provided with a static pump housing, a shiftable control ring and a rotatable pump rotor comprising several rotor vanes rotating within the shiftable control ring.
  • the control ring is shiftable with respect to the pump rotor to thereby vary the eccentricity of the control ring with respect to the pump rotor for controlling the displacement and, as a result, the volumetric pump performance.
  • variable lubricant vane pump is provided with a control ring preload spring arranged within a spring chamber, and preloading and pushing the shiftable control ring into a high-eccentricity direction.
  • the pump is also provided with a pilot chamber which is loaded with the pump outlet pressure causing the shiftable control ring to move into a low-eccentricity direction against the control ring preload spring.
  • the pump is provided with a control valve to regulate the hydraulic spring chamber pressure in a range between the pump outlet pressure and atmospheric pressure and, as a result to control the eccentricity of the control ring and thereby the volumetric pump performance.
  • the control valve allows providing different pump outlet set-pressure values.
  • WO 2016/010551 A1 discloses a variable lubricant vane pump, the spring chamber of which is in direct fluidic communication with a pump inlet chamber and thus loaded with a pump inlet pressure, and the hydraulic pilot chamber pressure of which is controlled by a control valve substantially in a range between a pump outlet pressure and the pump inlet pressure.
  • variable lubricant pumps are mechanically driven by the engine, variations of the engine rotational speed cause variations of the volumetric pump performance.
  • These pump performance variations are compensated by a closed-loop control of the eccentricity of the control ring via the control valve.
  • the closed-loop control of the control ring eccentricity can cause low-frequency oscillations of the control ring, in particular oscillations with frequencies in the range of 5 Hz to 50 Hz.
  • the control ring oscillations cause fluctuations of the pump outlet pressure and can reduce the pump efficiency.
  • the control ring oscillations are particularly present at relatively low pump outlet set pressures.
  • variable lubricant vane pump is provided with a static pump housing defining a pump inlet and a pump outlet.
  • the pump housing also defines a pump chamber wherein a shiftable control ring is provided.
  • the control ring can be supported at the pump housing being shiftable strictly linear or can be provided pivotable so that the control ring is moved along an arch-like path.
  • variable lubricant vane pump is also provided with a rotatable pump rotor located within the control ring.
  • the pump rotor comprises several rotor vanes defining several pump chamber compartments. The rotor vanes and, as a result, the pump chamber compartments rotate within the control ring.
  • the pump rotor axis of rotation is static so that a shifting of the control ring changes the eccentricity of the pump rotor with respect to the surrounding control ring to thereby control the displacement and, as a result, the volumetric performance of the pump.
  • variable lubricant vane pump is also provided with a control ring preload spring preloading and pushing the shiftable control ring into a high-eccentricity direction.
  • the pump In the maximum-eccentricity position, the pump provides the highest displacement and, as a result, the highest volumetric performance for a defined rotational speed.
  • the preload spring is arranged within a hydraulic spring chamber being pressure controlled by a pressure control valve.
  • the pressure control valve is fluidically connected to a load pressure and to an atmospheric pressure.
  • the control valve can control the spring chamber pressure between the load pressure and the atmospheric pressure to control the control ring eccentricity and thereby the volumetric pump performance to define and assure at least two different pump set-pressure values.
  • the control ring preload spring is provided with a low stiffness to allow low pump set-pressure values.
  • variable lubricant vane pump is also provided with a pilot chamber which is hydraulically pressurized with the load pressure via a hydraulic pilot chamber load line.
  • the pilot chamber load line is the only hydraulic connection of the pilot chamber so that the flow rate into/out of the pilot chamber is determined by the throughput of the hydraulic load line.
  • the pilot chamber pressure causes a movement of the control ring against the preload spring into a low-eccentricity direction.
  • variable lubricant vane pump is also provided with a hydraulic restrictor element restricting the throughput of the pilot chamber load line and thereby restricting the total flow rate into/out of the pilot chamber. Since the control ring movement changes the pilot chamber volume, a restriction of the hydraulic flow rate into/out of the pilot chamber damps the control ring movement in both directions. As a result, control ring oscillations can be avoided or at least minimized.
  • the load pressure being provided to the pilot chamber and via the control valve to the spring chamber is a gallery pressure of the engine being provided with the lubricant.
  • the engine gallery pressure is the controlled pressure parameter of the pump.
  • the internal combustion engine is supplied with the pressurized lubricant coming from the pump outlet and having the pump outlet pressure.
  • the pressure parameter to be controlled is the combustion engines gallery pressure, not the pump outlet pressure.
  • the load pressure is the pump outlet pressure being provided to the engine.
  • the pump outlet pressure is the controlled pressure parameter of the pump so that the engine is provided with a controlled pressure.
  • the pilot chamber is pressurized with the pump outlet pressure via a hydraulic pilot chamber load line being defined by the pump housing and directly fluidically connecting the pump outlet to the pilot chamber.
  • the pilot chamber load line can be a bore within the pump housing. This allows a compact pump set-up not requiring any external hydraulic connection for the pilot chamber.
  • the restrictor element is provided with a hydraulic cross section in the range of 0.25 mm 2 to 4 mm 2 . This allows a very efficient damping of the control ring movement.
  • the pressure control valve is a proportional valve allowing a continuous control of the spring chamber pressure and thereby of the control ring movement.
  • the pump performance can be controlled very accurate allowing a continuously variable and stable control of the pump outlet set pressure or of the engine gallery set pressure, respectively.
  • the shiftable control ring is provided shiftable exactly linear with respect to the pump rotor axis of rotation. This allows a simple frictional bearing of the control ring within the control ring housing body not requiring any hinges or pivoting bearings.
  • the lubricant pump is provided with a set-pressure control unit.
  • the set-pressure control unit controls the pressure control valve to adjust the pump set pressure corresponding to the requirements of the engine.
  • the set-pressure control unit can receive a set-pressure value from an engine control unit or can provide a temperature-dependent pump set-pressure control.
  • Figure 1 shows a schematic representation of a lubrication circuit arrangement of an internal combustion engine 100 including a variable lubricant vane pump 102 providing the engine 100 with pressurized lubricant.
  • the lubricant pump 102 is mechanically driven by the engine 100 so that the rotational speed of the lubricant pump 102 is proportional to the rotational speed of the engine 100.
  • the lubricant pump 102 sucks lubricant with atmospheric pressure PA from a lubricant tank 104 through a pump inlet 106 and provides pressurized lubricant with a pump outlet pressure PO through a pump outlet 108 via a lubricant supply line 110 to the engine 100.
  • the lubricant flows from the engine 100 via a lubricant return line 112 back to the lubricant tank 104.
  • the lubricant pump 102 comprises a pump housing 114 defining an inlet chamber 116, an outlet chamber 118, a pumping chamber 120 with a rotatable pump rotor 122 and with a shiftable control ring 124, a spring chamber 126 with a control ring preload spring 128, and defining a pilot chamber 130.
  • the pump inlet chamber 116 is provided with lubricant with atmospheric pressure PA via the pump inlet 106.
  • the pump outlet chamber 118 is pressurized with the pump outlet pressure PO and is fluidically connected to the pump outlet 108.
  • the pump rotor 122 is located within the control ring 124 and rotates in clockwise direction about a static axis of rotation A.
  • the pump rotor 122 is provided with five rotor vanes 123 being supported radially slidable within corresponding vane slits.
  • the pump housing 114, the control ring 124 and the rotor vanes 123 define five rotating pumping chamber compartments 125.
  • the control ring 124 is radially supported by the pump housing 114 via two radially protruding plungers 129,131.
  • the control ring 124 is shiftable exactly linear with respect to the pump rotor 122 whereby the first plunger 129 is moved within the spring chamber 126 and the second plunger 131 is moved within the pilot chamber 130.
  • the volumetric pump performance of the lubricant pump 102 can be controlled by moving the control ring 124 and thereby varying the eccentricity of the pump rotor 122 with respect to the surrounding control ring 124.
  • the control ring 124 is preloaded by the control ring preload spring 128 pushing the control ring 124 into a high-eccentricity direction H. As a result, if no other forces in shifting direction of the control ring 124 are effective with respect to the control ring 124, the control ring 124 is pushed into the maximum-eccentricity position providing the maximum volumetric pump performance.
  • the control ring preload spring 128 is provided with a low stiffness to allow low pump set-pressure values.
  • the control ring 124 is loaded in the high-eccentricity direction H by the pressure of the spring chamber 126.
  • the spring chamber pressure is controlled by a pressure control valve 132.
  • the control valve 132 is a proportional valve and is fluidically connected to an engine gallery pressure inlet 134 being provided with an engine gallery pressure PG.
  • the control valve 132 is also fluidically connected to the lubricant tank 104 via a lubricant outlet 136.
  • the control valve 132 allows controlling the spring chamber pressure in a pressure range between the atmospheric pressure PA and the engine gallery pressure PG to define and assure different pump set-pressure values.
  • the pressure control valve 132 is controlled by a set-pressure control unit 133 to adapt the pump set pressure to the requirements of the engine.
  • the control ring 124 is loaded in an opposing low-eccentricity direction L by the pressure of the pilot chamber 130.
  • the pilot chamber 130 is fluidically connected to the gallery pressure inlet 134 via a hydraulic pilot chamber load line 138. As a result, the pilot chamber is pressurized with the engine gallery pressure PG.
  • the radial position of the shiftable control ring 124 depends on the ratio of the spring chamber pressure to the pilot chamber pressure and, as a result, can be controlled via the control valve 132.
  • the second control ring plunger 131 moves within the pilot chamber 130.
  • the pilot chamber load line 138 is provided with a restrictor element 140 restricting the throughput of the pilot chamber load line 138.
  • the restrictor element 140 is provided with a minimum hydraulic cross section in the range of 0.25 mm 2 to 4 mm 2 , whereas all other hydraulic lines have minimum hydraulic cross section of at least 7 mm 2 .
  • the lubricant flow rate into/out of the pilot chamber 130 is restricted so that the movement of the control ring 124 is damped.
  • the damping of the control ring 124 movement minimizes the control ring oscillations and, as a result, minimizes the pump outlet pressure fluctuations.
  • Figure 2 shows a schematic representation of an alternative lubrication circuit arrangement with an alternative variable lubricant vane pump 202 according to the invention.
  • the features of the lubrication circuit and the lubricant pump 202 of figure 2 which correspond with the features of the lubrication circuit and the lubricant pump 102 of figure 1 have a reference number increased by 100.
  • the pressure control valve 232 is fluidically connected to the pump outlet chamber 218 via a valve supply line 242 and fluidically connected to the lubricant tank 204 via the lubricant outlet 236. As a result, the control valve 232 allows controlling the pressure of the spring chamber 230 in a pressure range between the atmospheric pressure PA and the pump outlet pressure PO.
  • the pilot chamber 230 is directly fluidically connected to the pump outlet chamber 218 via a pilot chamber load line 238 being defined by the pump housing 214. As a result, the pilot chamber 230 is pressurized with the pump outlet pressure PO.
  • the pilot chamber load channel 238 is provided with restrictor element 240 being provided by an orifice 241 with a hydraulic cross section in the range of 0.25 mm 2 to 1 mm 2 .
  • the restrictor element 240 restricts the throughput of the pilot chamber load channel 238 and, as a result, damps the movement of the control ring 224.

Landscapes

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

Claims (8)

  1. Verstellbare Schmiermittel-Flügelzellenpumpe (102, 202) zur Bereitstellung von unter Druck stehendem Schmiermittel mit einem Pumpenauslassdruck (PO), mit
    einem feststehenden Pumpengehäuse (114, 214), das einen Pumpeneinlass (106, 206) und einen Pumpenauslass (108, 208) bildet, einem verschiebbaren Steuerring (124, 224), der in Bezug auf einen Pumpenrotor (122, 222) verschiebbar ist, um dadurch zur Steuerung der volumetrischen Pumpenleistung die Exzentrizität des Steuerrings (124, 224) in Bezug auf den Pumpenrotor (122, 222) zu verändern,
    dem drehbaren Pumpenrotor (122, 222), der mehrere Rotorflügel (123, 223) umfasst, die sich innerhalb des verschiebbaren Steuerrings (124, 224) drehen,
    einer Steuerringvorspannfeder (128, 228), die in einer Federkammer (126, 226) angeordnet ist und den verschiebbaren Steuerring (124, 224) vorspannt und in eine Richtung hoher Exzentrizität drückt,
    einem Drucksteuerventil (132, 232), das den Federkammerdruck zwischen einem Beaufschlagungsdruck (PG, PO) und einem Atmosphärendruck (PA) steuert, um dadurch mindestens zwei verschiedene Pumpen-Solldruckwerte zu definieren,
    eine Vorsteuerkammer (230), die über eine Vorsteuerkammerbeaufschlagungsleitung (138, 238), die die einzige hydraulische Verbindung der Vorsteuerkammer (130, 230) bereitstellt, mit dem Beaufschlagungsdruck (PG, PO) beaufschlagt wird, wobei der Vorsteuerkammerdruck bewirkt, dass sich der verschiebbare Steuerring (124, 224) gegen die Steuerringvorspannfeder (128, 228) in eine Richtung niedriger Exzentrizität (L) bewegt, und
    ein hydraulisches Drosselelement (140, 240), das den Durchsatz der Vorsteuerkammerbeaufschlagungsleitung (138, 238) begrenzt.
  2. Verstellbare Schmiermittel-Flügelzellenpumpe (102) nach Anspruch 1, wobei der Beaufschlagungsdruck ein Motorgaleriedruck (PG) ist.
  3. Verstellbare Schmiermittel-Flügelzellenpumpe (202) nach Anspruch 1, wobei der Beaufschlagungsdruck der Pumpenauslassdruck (PO) ist.
  4. Verstellbare Schmiermittel-Flügelzellenpumpe (202) nach Anspruch 3, wobei die Vorsteuerkammerbeaufschlagungsleitung (238) durch das Pumpengehäuse (214) gebildet wird und den Pumpenauslass (208) direkt fluidisch mit der Vorsteuerkammer (230) verbindet.
  5. Verstellbare Schmiermittel-Flügelzellenpumpe (102, 202) nach einem der vorhergehenden Ansprüche, wobei das Drosselelement (140, 240) einen hydraulischen Querschnitt zwischen 0,25 mm2 und 4 mm2 aufweist.
  6. Verstellbare Schmiermittel-Flügelzellenpumpe (102, 202) nach einem der vorhergehenden Ansprüche, wobei das Drucksteuerventil (132, 232) ein Proportionalventil ist.
  7. Verstellbare Schmiermittel-Flügelpumpe (102, 202) nach einem der vorhergehenden Ansprüche, wobei der verschiebbare Steuerring (124, 224) in Bezug auf den Pumpenrotor (122, 222) exakt linear verschiebbar ausgebildet ist.
  8. Verstellbare Schmiermittel-Flügelzellenpumpe (102, 202) nach einem der vorhergehenden Ansprüche, wobei die Schmiermittelpumpe (102, 202) eine Solldrucksteuereinheit (133, 233) aufweist, die das Drucksteuerventil (132, 232) steuert.
EP17816761.5A 2017-12-13 2017-12-13 Verstellbare flügelzellenpumpe mit schmiermittel Active EP3724504B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/082638 WO2019114948A1 (en) 2017-12-13 2017-12-13 Variable lubricant vane pump

Publications (2)

Publication Number Publication Date
EP3724504A1 EP3724504A1 (de) 2020-10-21
EP3724504B1 true EP3724504B1 (de) 2023-06-28

Family

ID=60702756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17816761.5A Active EP3724504B1 (de) 2017-12-13 2017-12-13 Verstellbare flügelzellenpumpe mit schmiermittel

Country Status (3)

Country Link
EP (1) EP3724504B1 (de)
JP (1) JP7026786B2 (de)
WO (1) WO2019114948A1 (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111196116B (zh) * 2018-11-16 2024-04-09 株式会社爱信 减震器

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2742861A (en) * 1950-12-26 1956-04-24 Houdaille Industries Inc Stabilized variable displacement pump
JP6423431B2 (ja) 2013-11-21 2018-11-14 ピアーブルグ パンプ テクノロジー ゲゼルシャフト ミット ベシュレンクテル ハフツングＰｉｅｒｂｕｒｇ Ｐｕｍｐ Ｔｅｃｈｎｏｌｏｇｙ ＧｍｂＨ 可変容量潤滑剤ポンプ
US10563652B2 (en) * 2014-07-18 2020-02-18 Melling Tool Company Variable displacement vane pump
JP2017137854A (ja) * 2016-01-29 2017-08-10 株式会社山田製作所 可変容量ベーンポンプ
EP3526447B1 (de) * 2016-10-12 2024-08-14 Pierburg Pump Technology GmbH Variable mechanische kfz-schmierstoffpumpe

Also Published As

Publication number Publication date
WO2019114948A1 (en) 2019-06-20
JP2020537086A (ja) 2020-12-17
EP3724504A1 (de) 2020-10-21
JP7026786B2 (ja) 2022-02-28

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