EP0681656B1 - Procede de regulation de la capacite de pompage de pompes a lubrifiant et pompe a lubrifiant appropriee - Google Patents

Procede de regulation de la capacite de pompage de pompes a lubrifiant et pompe a lubrifiant appropriee Download PDF

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Publication number
EP0681656B1
EP0681656B1 EP94905653A EP94905653A EP0681656B1 EP 0681656 B1 EP0681656 B1 EP 0681656B1 EP 94905653 A EP94905653 A EP 94905653A EP 94905653 A EP94905653 A EP 94905653A EP 0681656 B1 EP0681656 B1 EP 0681656B1
Authority
EP
European Patent Office
Prior art keywords
pump
pressure
temperature
lubricant
control
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
EP94905653A
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German (de)
English (en)
Other versions
EP0681656A1 (fr
Inventor
Uwe Lehmann
Bodo Stich
Maik Wilhelm
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.)
Daimler Benz AG
Original Assignee
Daimler Benz 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 Daimler Benz AG filed Critical Daimler Benz AG
Publication of EP0681656A1 publication Critical patent/EP0681656A1/fr
Application granted granted Critical
Publication of EP0681656B1 publication Critical patent/EP0681656B1/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
    • F04C14/18—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
    • F04C14/226—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 by pivoting the cam around an eccentric axis
    • 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
    • F04C2270/19—Temperature

Definitions

  • the present invention relates to a method for regulating the Pump performance of lubricant pumps, in which the pump performance over the prevailing at the pump outlet or at a consumption point Pressure is controlled so that the pressure increases Pump power is effectively reduced.
  • the present concerns Invention a controllable lubricant pump with a Control device through which to limit the flow rate Pump power is effectively reduced.
  • a corresponding procedure and a corresponding device are from DE 33 33 647 A1 known.
  • a controllable lubricant pump (Vane pump) with automatic pressure control with an in described a housing on one side pivoted cam ring, whose eccentricity from the pumped medium Pressure medium area by means of a spring biased counter bracket control device is adjustable, as well as with suction and pressure openings in the housing, whereby to the radial Support the wing of said vane pump against the Hubring at least two guide rings in chambers on the two End faces of the rotor body are arranged radially movable and a channel connects the pressure side with the chambers.
  • the counter bracket biased by a compression spring a stop has and the control device on the to tap the Hubringes opposite side is a control piston, the Inside via a control line directly with the pressure side of the pump connected is.
  • the application of the present invention is not limited to vane pumps.
  • the invention can also be applied to all controllable pumps, in particular also to those that only have a so-called loss control, i.e. which, when a predeterminable pressure is exceeded, excess lubricant over a Bypass bypass at points of consumption, only the pumped through the system Lubricant quantity (effective delivery quantity) is reduced, but not that by the pump self-funded amount.
  • loss control i.e. which, when a predeterminable pressure is exceeded, excess lubricant over a Bypass bypass at points of consumption, only the pumped through the system Lubricant quantity (effective delivery quantity) is reduced, but not that by the pump self-funded amount.
  • adjustable Pumps preferred, in which the delivery capacity of the pumps or their Delivery volume and not only the effective delivery volume can be influenced.
  • the term "effective delivery volume” is the volume of the lubricant understood which per unit of time through the consumption points, the corresponding feed and Discharges and any upstream units, such as Oil filter, under pressure is pumped. Oil which e.g. via bypass lines and to a pump sump is not considered part of the effective funding volume. That too Drainage of oil via bypass lines limits the pressure at the pump outlet and in entire system, whereby however no energy saving can be achieved. A noteworthy Energy reduction is only achieved if the pump-driven pump is used from the outset Volume is adapted to the requirements as with variable vane pumps or with multi-stage Constant pumps with register control.
  • Lubricant pumps of this type are primarily used for supplying lubrication points on internal combustion engines, in particular for motor vehicles.
  • the lubricant requirement or minimum requirement of an internal combustion engine is, however, of a number different factors.
  • the operating temperature is a key factor here the engine and / or the relevant lubrication points as well as the lubricant.
  • the oil generally used as a lubricant When cold, the oil generally used as a lubricant has a high viscosity and is difficult to push through narrow gaps in the lubrication points. At the same time, however, the lubricant requirement is also in the cold state of the internal combustion engine not excessively high, since the parts that move against each other in the cold state in general also have a smaller game against each other and the viscosity of the oil is large and therefore less oil can be passed through.
  • a pressure limitation is usually provided, which is either too much derives pumped lubricant via a bypass or the pump delivery rate immediately limited, so that the delivered lubricant at the predetermined limit pressure can be conveyed through the lubricant system.
  • the flow resistance in the lubricant system decreases, so that the delivery rate gradually can be increased, which happens, among other things, that the pressure is slightly below of the limit pressure drops, as a result of which the effective delivery rate or the pump output is increased accordingly.
  • the control characteristic of the known controllable pumps is included generally set so that the outlet pressure remains approximately constant and only the delivery rate varies depending on the flow resistance in the lubricant system.
  • the design point for the pump capacity is the oil requirement of the engine at idling speed when hot and with a correspondingly low-viscosity oil. Even in this condition Provide the pump with a certain minimum flow rate and thus a certain minimum oil pressure, the pump shaft generally being directly coupled to the motor, as previously mentioned.
  • the volumetric efficiency of the oil pumps decreases with decreasing temperature due to lower leakage losses.
  • the oil consumption of the Motors with falling temperature.
  • the engine throughputs of the Figure 1 does not reflect the amount of oil the engine actually has at the specified Speed and temperature as a minimum amount of lubricant, but only what he needs at constant pressure and the specified temperatures and speeds of lubricant records. The conveyance of lubricant that is not actually required in this quantity under pressure naturally costs energy.
  • this object is achieved in that a temperature and / or a speed detection an additional one from any pressure-dependent regulation independent regulation or limitation of the effective delivery volume takes place.
  • the temperature control permitted flow rate increases with temperature.
  • control device which has a temperature sensor and / or a speed sensor and an actuator which regardless of any pressure control, the effective delivery rate depending on the Temperature and / or speed reduced.
  • independent of any pressure control means in the sense of the present Invention does not necessarily mean that the temperature or speed control without any influence to the pressure control or from any pressure control in any operating condition remains unaffected, but only that temperature and / or speed as an additional, independent parameters for the setting of an oil flow and the resulting Oil pressure can be used.
  • the delivery rate is not only set so that at the points of consumption or any upstream or downstream aggregates, a specifiable maximum pressure is not exceeded, Instead, depending on the temperature and / or the speed, an additional further limitation of the flow rate can be adjusted so that the pressure at the outlet of the Pump or at the pressure measuring points provided for pump control still clearly remains below the predefinable maximum pressure, namely when the system z. B. at the suitable points measured temperature or in the low speed range has correspondingly lower lubricant requirements, so that the lubricant is not below the in particularly critical operating conditions require higher pressure or in a corresponding smaller amount must be provided (see Figure 2).
  • the lubricant pump according to the invention is an adjustable vane pump.
  • Adjustable vane pumps have the advantage that the mechanical adjustment of their cam ring in a relatively simple way Delivery volume can be adjusted. This has the advantage that the pump shaft directly with the Motor can be coupled and still a regulation of the delivery volume independent of the motor is possible.
  • other control devices are also conceivable, with which For example, the speed at which a lubricant pump is driven via pressure and / or temperature-related actuators is regulated. However, this requires one independent drive for the pump.
  • a wedge with a Thermostats such as a bimetallic strip, are provided, the one of which has a wedge flank the cam ring engages so that the cam ring is adjusted when the wedge is displaced.
  • a bimetal strip for example, can be part of the actuator or as an actuator itself are provided, such a bimetallic strip also being designed and can be arranged that, if desired, it engages directly with the cam ring and this is adjusted depending on the temperature of the bimetal strip.
  • Measurement and control can also take place, for example, via electrical elements, such as temperature-dependent electrical components, especially resistors, in an electrical Control loop are measured and emit an electrical signal as an output variable, the one adjustment of an actuator corresponding to the electrical signal.
  • electrical elements such as temperature-dependent electrical components, especially resistors
  • a special case of such a system is e.g. a stepped piston, one part of the surface for Pressure control from the outlet pressure of the pump or the pressure at a point of consumption is applied.
  • Another surface of the stepped piston can optionally be pressurized depending on the speed or temperature via a temperature or speed-controlled valve.
  • a temperature or speed-controlled valve At low temperature or speed, for example Valve must be open so that pressure is also applied to the second partial surface of the stepped piston is, which leads to a stronger adjustment of the stepped piston, so that the cam ring is set that there is a smaller delivery volume and thus a relatively small operating pressure sets.
  • the valve is switched over the temperature or Speed control closed, so that only a smaller area of the piston of Pressure is applied so that the pump to a higher outlet pressure and a higher Delivery rate is set.
  • the corresponding control and activation elements should be as simple as possible, so that the pump as a whole does not become much more complicated. This is especially true for the Use of the pump in standard situations, e.g. in internal combustion engines. In case of Motors or generally systems with a need for lubricants that change very strongly Operating conditions are exposed, but can also be a more complex temperature control the amount of lubricant appropriate and reasonable, provided that this additional effort correspondingly large energy savings due to the possible reduction in the amount of lubricant delivered.
  • the pressure in the feed lines to the engine has always the same value (e.g. 5 bar).
  • This pressure is designed so that in the most critical state, i.e. with the greatest oil demand, So at the highest temperature and the highest speed, with an oil of the lowest permissible viscosity the oil requirement of the engine is still covered.
  • a vane pump 1 with an adjustable lifting ring 2 is shown schematically in FIG.
  • a temperature controller for the eccentricity of the cam ring 2 is also shown schematically with respect to the pump shaft 6.
  • the temperature controller 3 consists of a temperature sensor or a thermosensitive element 4, a wedge 5 and a spring 7, which are in a row next to the Cam ring are arranged.
  • the temperature controller 3 is located inside, for example Pump housing and is in direct contact with the oil to be pumped, which by radial Openings penetrate into the cam ring and through axial openings in the pump housing again can leak. So that the thermosensitive element 4 is essentially at the temperature of the lubricant held.
  • element 4 could be, for example Be an element whose thermal expansion is relative in the temperature range of interest is large (for example, element 4 could contain a gas volume).
  • element 4 could contain a gas volume.
  • a compression spring 9 is provided, for example, which on a Actuating pin 10 of the cam ring 2 acts and this up against a flank of the wedge presses.
  • the cam ring 2 is relative to the pump shaft 6 so arranged that the cam ring eccentricity with respect to the shaft 6 by pivoting the Hubringes 2 upward about the axis 8, so when the wedge 5 moves to the right.
  • the cam ring 2 is flanked by one edge of the wedge 5 pressed down against the action of the spring 9 when the temperature of the lubricant system decreases or is lower, the wedge 5 shifting from right to left.
  • Suitable guides can ensure that the wedge 5 is not in the transverse direction to his can shift the intended travel range.
  • the vane pump can be essentially identical to the vane pump 4, only the control direction 3 is by a leaf spring or a bimetallic strip 4 ' replaced, which simultaneously the function of a temperature sensor and an actuator takes over. As the temperature increases, the two are firmly connected Metal strips of the bimetallic strip 4 'differ, so that depending on the relative arrangement of these two metal elements, the curvature of the leaf spring 4 'increases or decreases and the Eccentricity of the cam ring 2 with respect to the pump shaft is reduced accordingly or is enlarged.
  • an electrically controllable temperature controller is shown as an actuator 5, the measured by a temperature sensor and measured in a corresponding Control signal is implemented, which adjusts the cam ring in the desired direction, i.e. so, that its eccentricity increases with the temperature of the lubricant.
  • the remaining Details of the preload of the cam ring 2 by a spring 9 and the relative arrangement of lifting ring 2, bearing axis 8 and pump shaft 6 can with the embodiment of Figure 4 in be essentially identical.
  • FIG. 7 shows a further variant of the adjustment of the lifting ring of a vane pump shown.
  • a first partial area 11 of the step piston 5 constantly acted upon by the outlet pressure P2 of the pump, so that this provides a maximum pressure limitation.
  • a second stage of the Piston 5 on a surface 12 to which a pressure P1 can be applied which is the simplest Case is identical to pressure P2 and comes from the same source.
  • a controllable valve 13 is provided, which switches depending on the temperature and / or speed.
  • the valve 13 can be opened be so that both surfaces 11 and 12 are pressurized and thereby a larger Total force against the spring 9 acts as if only the surface 11 were pressurized.
  • the cam ring and shaft of the vane pump are arranged so that the eccentricity of the Lift ring by moving the actuator or step piston 5 down in Figure 7 is reduced.
  • the valve 13 With increasing temperature and / or speed, the valve 13 is closed, see above that only the surface 11 is pressurized and the cam ring under the effect of Spring 9 again in the direction of greater eccentricity and thus a higher delivery rate Vane pump is adjusted.
  • the valve can not only be temperature-dependent, but can also be switched depending on the speed. You have in addition to the pure Maximum pressure limitation and delivery volume control an additional limitation of the Delivery volume depending on the temperature and / or the speed of the motor.
  • the structure of the pump is somewhat reduced by the additional control elements provided more complicated, but the energy savings that can be achieved with the pump outweigh these small ones Disadvantage without further ado, especially since the embodiment according to FIG. 5 is a very simple implementation of the additional control according to the invention shows.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Rotary Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (2)

  1. Procédé pour régler la puissance de pompage d'une pompe à lubrifiant, dans laquelle au-dessus de la pression qui règne à la sortie de la pompe ou à l'emplacement d'un appareil d'utilisation, la puissance de pompage effective est réduite au moyen d'une régulation qui dépend de la pression,
    caractérisé en ce
    qu'une limitation indépendante supplémentaire de la puissance de refoulement est exécutée au moyen d'une détection de la température et/ou de la vitesse de rotation, la quantité de refoulement autorisée au moyen de la régulation de température étant limitée par rapport à la quantité de refoulement autorisée par la régulation qui dépend de la pression, lorsque la température et/ou la vitesse de rotation augmentent.
  2. Pompe à lubrifiant réglable, notamment pompe cellulaire à palettes, comportant un dispositif de régulation (2) commandé par la pression,
    caractérisée en ce
    qu'il est prévu un dispositif de régulation (3) comportant un capteur de la vitesse de rotation et/ou un capteur de température (4) et un organe de réglage (5) qui, en dehors du dispositif de régulation de la pression, règlent la quantité de refoulement effective en fonction de la vitesse de rotation et/ou de la température, l'élément de régulation de la pompe à lubrifiant pouvant être commandé électriquement, et l'organe de réglage (5) étant un piston étagé, dont au moins une partie peut être chargée par une pression par l'intermédiaire d'une soupape (13) pouvant être commandée en fonctionn de la température.
EP94905653A 1993-01-30 1994-01-27 Procede de regulation de la capacite de pompage de pompes a lubrifiant et pompe a lubrifiant appropriee Expired - Lifetime EP0681656B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4302610A DE4302610C2 (de) 1993-01-30 1993-01-30 Verfahren zum Regeln der Pumpleistung von Schmiermittelpumpen und Schmiermittelpumpe hierfür
DE4302610 1993-01-30
PCT/DE1994/000087 WO1994017308A1 (fr) 1993-01-30 1994-01-27 Procede de regulation de la capacite de pompage de pompes a lubrifiant et pompe a lubrifiant appropriee

Publications (2)

Publication Number Publication Date
EP0681656A1 EP0681656A1 (fr) 1995-11-15
EP0681656B1 true EP0681656B1 (fr) 1998-04-08

Family

ID=6479271

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Application Number Title Priority Date Filing Date
EP94905653A Expired - Lifetime EP0681656B1 (fr) 1993-01-30 1994-01-27 Procede de regulation de la capacite de pompage de pompes a lubrifiant et pompe a lubrifiant appropriee

Country Status (9)

Country Link
US (1) US5800131A (fr)
EP (1) EP0681656B1 (fr)
JP (1) JPH08505919A (fr)
KR (1) KR960700414A (fr)
CN (1) CN1051358C (fr)
BR (1) BR9406194A (fr)
DE (1) DE4302610C2 (fr)
ES (1) ES2117251T3 (fr)
WO (1) WO1994017308A1 (fr)

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CN110529720A (zh) * 2019-09-26 2019-12-03 淄博九洲润滑科技有限公司 一种全密封式润滑接力泵
CN113494600B (zh) * 2021-07-26 2022-08-23 潍柴动力股份有限公司 一种异常诊断方法及装置
CN114754282B (zh) * 2022-04-24 2024-06-21 浙江夏厦精密制造股份有限公司 一种改进型汽车用油泵

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DE4302610C2 (de) 1996-08-08
ES2117251T3 (es) 1998-08-01
CN1117307A (zh) 1996-02-21
JPH08505919A (ja) 1996-06-25
US5800131A (en) 1998-09-01
CN1051358C (zh) 2000-04-12
BR9406194A (pt) 1995-12-12
DE4302610A1 (de) 1994-08-04
WO1994017308A1 (fr) 1994-08-04
KR960700414A (ko) 1996-01-20
EP0681656A1 (fr) 1995-11-15

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