EP3382169A1 - Pompe à huile à déplacement réglable électriquement - Google Patents

Pompe à huile à déplacement réglable électriquement Download PDF

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Publication number
EP3382169A1
EP3382169A1 EP18161130.2A EP18161130A EP3382169A1 EP 3382169 A1 EP3382169 A1 EP 3382169A1 EP 18161130 A EP18161130 A EP 18161130A EP 3382169 A1 EP3382169 A1 EP 3382169A1
Authority
EP
European Patent Office
Prior art keywords
dielectric
axis
actuator
pump
rotation
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.)
Withdrawn
Application number
EP18161130.2A
Other languages
German (de)
English (en)
Inventor
Olivier Marie Heri Charvet
Istvan Denes
Klaus Kuhnen
Gabriele Michalke
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.)
Robert Bosch GmbH
VHIT SpA
Original Assignee
Robert Bosch GmbH
VHIT SpA
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 Robert Bosch GmbH, VHIT SpA filed Critical Robert Bosch GmbH
Publication of EP3382169A1 publication Critical patent/EP3382169A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/16—Controlling lubricant pressure or quantity
    • 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
    • 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
    • F04C2/3441—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 the inner and outer member being in contact along one line or continuous surface substantially parallel to the axis of rotation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0238—Rotary pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0207—Pressure lubrication using lubricating pumps characterised by the type of pump
    • F01M2001/0246—Adjustable pumps
    • 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
    • F04C2240/00—Components
    • F04C2240/80—Other components
    • F04C2240/811—Actuator for control, e.g. pneumatic, hydraulic, electric
    • 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
    • F04C2270/07—Electric current
    • 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
    • F04C2270/10—Voltage

Definitions

  • the present invention relates to oil pumps for the lubricant supply of internal combustion engines, in which the displacement is decoupled from the rotational speed of the drive source.
  • the speed of the vane pump is generally rigidly coupled to the engine speed. In the oil circuit of the engine, however, a predetermined oil pressure is required regardless of the engine speed. In order to decouple the displacement of the vane pump, and thus also the generated oil pressure from the engine speed, the ratio between the displacement and the engine speed is changed.
  • the oil pressure may be controlled purely hydraulically to a desired value by mechanically contrasting a spring force in such a way that the oil pressure in a control chamber tends to reduce said offset, while the spring force increases the offset, and thus the displacement.
  • a variable displacement vane pump comprises a housing having an inlet and an outlet, a rotor drivable for rotation about a rotation axis, and a plurality of vanes coupled to the rotor. Furthermore, a limiter ring is provided, with which the wings are engaged, so that they form a plurality of pumping chambers together with the limiter ring. These pumping chambers are alternately engageable with the inlet and the outlet as the vanes move through the rotor, with the change in volume experienced by the pumping chambers as the vanes move being dependent on the offset d between the symmetry axis of the limiter ring and the axis of rotation of the rotor ,
  • the limiter ring is coupled to at least one linear actuator.
  • This actuator is designed, upon application of an electrical voltage U, and / or with an electric current I, a force Fs, and / or a torque ms, to exert on the limiting ring, and thus the offset d between the axis of symmetry and the axis of rotation to change.
  • the applied force Fs or the applied torque ms
  • the oil pressure p is so far no longer available as an auxiliary power source.
  • the linear actuator is to be dimensioned larger in relation to the displacement and the exerted force.
  • the energy required for engagement in the displacement is no longer based on the mechanical energy supplied by the engine and stored in the oil pressure, but on the electrical system, which makes the detour via the alternator necessary and tends to reduce the efficiency.
  • the displacement By adjusting the displacement by electrical means, it is in particular possible to regulate the oil pressure p depending on the operating point of the internal combustion engine to any desired values, for example in the range between 1 and 4 bar, with the required accuracy of ⁇ 0.25 bar.
  • the electrical intervention in the displacement is possible with a significantly greater slope than a hydraulic engagement, in particular when the current oil pressure p is low. For example, a change from the lowest to the highest setpoint can be initiated within 0.7 s to 1 s.
  • the oil pump is easier and more compact to build, since effective areas and lines for the hydraulic feedback of the current oil pressure p can be omitted.
  • the oil pump is relevant for operational safety, as a shortage of oil can cause engine damage in a short time. Therefore, advantageously, the limiter ring is biased by a spring, which increases the offset d between the axis of symmetry of the limiter ring and the axis of rotation of the rotor, and thus the displacement per revolution of the rotor.
  • the spring is effective even in case of power failure. Thus, in the event of a fault, a displacement occurs, which may be unnecessarily high and consumes a lot of energy, but ensures reliable lubrication of the engine.
  • a safety circuit which transfers the actuator in case of failure of the electrical supply in a position corresponding to a higher offset d. Since steady state operation of the engine at an operating point does not require the oil pressure p to be changed permanently, it is advantageous in terms of energy consumption to use an actuator that maintains its current state even without permanently applying a voltage U or a current I. The flip side of this is that in case of failure, the spring used for the bias must overcome the holding force of the actuator, so that, for example, even with a sudden increase in load request to the engine sufficient oil is pumped. The safety circuit closes this gap.
  • the limiter ring is articulated in the housing at a pivot point. Then the force arm, with which the actuator, or the spring acts on the limiter ring, another degree of freedom for sizing.
  • the actuator is designed to change when exposed to the voltage U, and / or with the current I, its length L.
  • a piezoelectric element may be used.
  • Such an element has only a relatively small change in length with respect to the applied electric field, but the displacement can be increased, for example, with an inertial drive or an inchworm motor.
  • the actuator comprises at least one capacitor with two electrodes and an elastic dielectric disposed between the electrodes.
  • the electrodes may extend substantially in a plane. Storing charges in such a capacitor causes the oppositely charged electrodes to attract with a Maxwell force F M. This Maxwell force F M compresses the dielectric so that the capacitor as a whole contracts like a muscle. This condition is maintained even when the power source is removed. Only when the charge has drained from the electrodes, the elastic restoring force of the dielectric pushes the capacitor back to its original shape. In the context of the invention, this means that electrical energy must be expended only for a change in the displacement of the vane pump, but not for the mere maintenance of the current state.
  • the dielectric is an elastomer. Then, the compression of the dielectric by the Maxwell force is completely reversible, that is, the dielectric returns to its original shape. Over the lifetime of the oil pump, approximately 2 million cycles between the lowest and highest displacement are expected.
  • the elastomer has the lowest possible viscoelastic damping. This damping leads to mechanical energy losses and to a heating of the capacitor.
  • the capacitor may in particular be formed as a dielectric electro-active polymer, DEAP, in which the dielectric is fixedly coupled to two electrodes which can be stretched with the dielectric.
  • DEAP dielectric electro-active polymer
  • the dielectric may be coated on both sides with the electrodes.
  • the electrodes are stretchable with the dielectric, the applied between the electrodes electric field still affects the entire Dielectric, if this expands.
  • the compression of the dielectric is in some way a self-reinforcing effect: as the distance between the electrodes decreases, the same amount of charge on the electrodes increases the electric field, which is inversely proportional to the distance. This increases the Maxwell force F M and further compresses the dielectric. This cycle ends only when the Maxwell force F M and the elastic restoring force of the elastomer balance each other. For example, the dielectric can be compressed to 30% of its original thickness.
  • the dielectric has a dielectric constant ⁇ of 2 or more, preferably 3 or more.
  • ⁇ is also a measure of how well the dielectric is insulating, i.e., how long it takes for the capacitor to self-discharge and charges to be externally fed in order for the actuator to maintain its current state.
  • the actuator has a stack of several capacitors, wherein in each capacitor, the dielectric in the discharged state of the capacitor has a thickness of 100 microns or less.
  • the Maxwell force F M depends quadratically on the electric field strength, which in turn is inversely proportional to the thickness of the dielectric. By dividing the dielectric into many thin layers, the usable Maxwell force F M can be increased disproportionately.
  • the actuator has an electrically driven motor and means for translating the rotation of the motor in a linear movement.
  • the motor can drive a screw or a rack, which in turn engages the restrictor ring.
  • the vane pump 1 comprises a housing 2, in which a rotor 3 is rotatably mounted about an axis of rotation 30.
  • the connection to the internal combustion engine as a drive source is in FIG. 1 not shown.
  • the rotor 3 has slots 31-38 in which the wings 41-48 are guided. Springs 31a-38a push the wings 41-48 against the inner circumference of the limiter ring 5. As a result, pumping chambers 51-58 form.
  • the pumping chambers 51-58 have different volumes.
  • one of the pumping chambers 51-58 passes the inlet 21 of the vane pump 1, its volume becomes maximum, so that oil is sucked into this pumping chamber 51-58. If this pumping chamber 51-58 then moves in the direction of the outlet 22, the volume of this pumping chamber 51-58 steadily decreases, ie the oil contained therein is pressurized.
  • the reason for this is that the symmetry axis 50 of the limiter ring 5 is displaced by an offset d with respect to the axis of rotation 30 of the rotor. If the axis of symmetry 50 and the axis of rotation 30 were congruent, the volume of the pumping chambers 51-58 would no longer change, and at most it would still convey a minimal amount of oil.
  • the limiter ring 5 can be moved to the right on the jaws 23 and 24, which correspond to the position of the limiter ring 5, in which its axis of symmetry 50 is congruent with the axis of rotation 30 of the rotor 3.
  • the actuator 6 is driven with a voltage U from the voltage source 65 and shortens its length L, whereby a force Fs is exerted on the limiter ring 5.
  • FIG. 2 shows an embodiment of a capacitor 61, which can be used in an actuator 6 for power application.
  • the capacitor 61 is connected via a switch 64 to the voltage source 65.
  • the capacitor 61 consists of two electrodes 62a and 62b with an elastic dielectric 63 interposed therebetween.
  • the switch 64 is open. There is no charge on the electrodes 62a and 62b of the capacitor 61. Accordingly, the dielectric 63 is in the normal force-free state.
  • the switch 64 is closed.
  • the voltage U from the voltage source 65 is applied between the electrodes 62a and 62b of the capacitor 61. Accordingly, the electrodes 62a and 62b pull with the Maxwell force F M. By this force F M , the dielectric 63 is compressed.
  • the electrodes 62a and 62b are at a minimum distance from each other. Since the electrodes 62a and 62b are fixed to the dielectric 63 coupled, they expand laterally together with the dielectric 63.
  • FIG. 2c shows a safety circuit 67, with which the capacitor 67 can be discharged automatically when the voltage source 65 fails.
  • a change-over switch 66 is connected to the voltage source 65 via a control line. This switches the switch 66 against the restoring force of a spring 66a in the in Figure 2c shown switching position in which the electrode 62 a of the capacitor 61 is connected to the output of the switch 64.
  • the capacitor 61 can therefore be charged and compressed by closing the switch 64, and this state then remains even after the opening of the switch 64 is obtained.
  • the spring 66a pushes the switch 66 into the in Figure 2c not shown switching position in which the capacitor 61 is short-circuited via the discharge resistor 67a.
  • the capacitor 61 then returns to its original state.
  • the actuator 6 expands back to its original length L.
  • the spring 7 can convert the restrictor ring 5 back to the state of maximum offset d without being prevented from doing so by the actuator 6.
  • the discharge resistor 67a should be dimensioned such that the maximum discharge current of the capacitor 61 is limited to a value that does not yet result in damage to the electrodes 62a and 62b, and / or the dielectric 63. Such damage could be caused, for example, by the fact that electrodes 62a and 62b applied as thin layers to the dielectric 63 strongly heat up at a high discharge current.
  • FIG. 3 shows a further embodiment of the actuator 6.
  • an electric motor 68 drives a gear 69a, which engages in a rack 69b.
  • the gear 69a and the rack 69b form the means 69 for translating a rotational movement of the electric motor 68 in a linear movement of the limiter ring fifth
  • FIG. 4 shows a further embodiment of a vane pump 1.
  • the restrictor ring 5 is articulated at a point 27 in the housing 2 here.
  • This constraint condition converts the forces F F and Fs introduced by the spring 7 on the one hand and by the actuator 6 on the other hand into torques m F and ms, respectively.
  • the deflection as a displacement of the lever 59, at which the spring 7 and the actuator 6 attack each with the lever arm rs approximate.
  • the most important parameters for the specific dimensioning are the stiffness C P of the spring 7, the elastic Young's modulus Y S and the dielectric constant ⁇ of the dielectric 63 contained in the DEAP capacitor 61, the cross-sectional area As and edge length bs of the dielectric 63 and the bias voltages x P and X S of the spring 7 and the dielectric 63rd
  • FIG. 5 shows an embodiment of a voltage source 65 for feeding the capacitor 61 in the actuator 6 from the electrical system 8 of a motor vehicle.
  • the electrical system 8 carries the voltage Uv of typically 12 V, in commercial vehicles also 24 V.
  • a voltage U S of typically about 400 V is required. It is technically possible to bridge such a large voltage difference with a simple switching power supply, but the system dynamics are poor.
  • the voltage U V of the electrical system 8 is first raised with a first switching power supply 65 a to an intermediate level Uw, which is higher than the finally required level Us. With the voltage Uw, a buffer capacitor 65b is charged. The voltage Uw is then brought to the level Us with a second switching power supply 65c.
  • the first switching power supply 65a includes an input-side inductor Lv and two clocked switches S V1 and S V2 .
  • the switch S V1 consists of a switching element Z V1 and a diode Dvi connected in parallel therewith.
  • the switch S V2 consists of a switching element Z V2 and a diode D V2 connected in parallel therewith.
  • the choke Lv prevents the timing of the switches S V1 and S V2 feedbacks disturbances in the electrical system 8.
  • the second switching power supply 65c is constructed analogously with switches S W1 and S W2 , which comprise a switching element Z W1 and a diode D W1 parallel thereto, or a switching element Z W2 and a diode D W2 parallel thereto.
  • switches S W1 and S W2 which comprise a switching element Z W1 and a diode D W1 parallel thereto, or a switching element Z W2 and a diode D W2 parallel thereto.
  • a choke L W is arranged, which decouples the capacitor 61 from interference pulses by the timing of the switches S W1 and S W2 .
  • the capacitor 61 is in FIG. 5 drawn as an equivalent circuit diagram.
  • An ideal capacitance C S is drawn in series with an internal resistance R S and in parallel with a leakage resistance Gs which causes a self-discharge of the capacitance Cs.
  • the currents flowing on the three voltage levels Uv, Uw and Us are denoted by I V , I W and I S , respectively.
  • MOSFET transistors As switching elements Zvi, Z V2 , Z W1 and Z W2 can be used.
  • DEAP capacitors 61 which are operated with a voltage U S of 3 kV.
  • IGBT transistors can be used as switching elements Zvi, Z V2 , Z W1 and Z W2 .
  • the advantage of using MOSFET transistors is that the significantly higher possible switching frequency requires less energy to be converted in each individual switching cycle. Therefore, smaller and cheaper passive components can be used in power electronics.
  • the two switching power supplies 65a and 65c are operated asymmetrically: the first switching power supply 65a operates at a fixed switching frequency of .mu.m. present example 20 kHz.
  • the switching frequency of the second switching power supply 65c is adjusted depending on the situation in order to minimize the number of switching cycles.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
EP18161130.2A 2017-03-27 2018-03-12 Pompe à huile à déplacement réglable électriquement Withdrawn EP3382169A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017106546.6A DE102017106546A1 (de) 2017-03-27 2017-03-27 Ölpumpe mit elektrisch verstellbarer Verdrängung

Publications (1)

Publication Number Publication Date
EP3382169A1 true EP3382169A1 (fr) 2018-10-03

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EP18161130.2A Withdrawn EP3382169A1 (fr) 2017-03-27 2018-03-12 Pompe à huile à déplacement réglable électriquement

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DE (1) DE102017106546A1 (fr)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005034712A1 (de) * 2005-07-26 2006-02-16 Daimlerchrysler Ag Regelbare Ölpumpe
WO2007003048A1 (fr) * 2005-06-30 2007-01-11 Victhom Human Bionics Inc. Activateur polymère diélectrique
EP2138718A2 (fr) * 2008-06-26 2009-12-30 Hamilton Sundstrand Corporation Pompe à débit variable
DE102009039776A1 (de) * 2009-09-02 2011-03-03 Audi Ag Vorrichtung und Verfahren zur Regelung eines Schmierölstroms, insbesondere zur Kühlung und Schmierung eines Getriebes
US20120093672A1 (en) * 2009-03-05 2012-04-19 Florin Stratulat Direct control linear variable displacement vane pump
US20150285246A1 (en) 2013-01-21 2015-10-08 Toyota Jidosha Kabushiki Kaisha Variable displacement oil pump
DE102014221447A1 (de) * 2014-10-22 2016-04-28 Zf Friedrichshafen Ag Verstellpumpe
US9410514B2 (en) 2012-09-07 2016-08-09 Hitachi Automotive Systems, Ltd. Variable displacement oil pump

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007003048A1 (fr) * 2005-06-30 2007-01-11 Victhom Human Bionics Inc. Activateur polymère diélectrique
DE102005034712A1 (de) * 2005-07-26 2006-02-16 Daimlerchrysler Ag Regelbare Ölpumpe
EP2138718A2 (fr) * 2008-06-26 2009-12-30 Hamilton Sundstrand Corporation Pompe à débit variable
US20120093672A1 (en) * 2009-03-05 2012-04-19 Florin Stratulat Direct control linear variable displacement vane pump
DE102009039776A1 (de) * 2009-09-02 2011-03-03 Audi Ag Vorrichtung und Verfahren zur Regelung eines Schmierölstroms, insbesondere zur Kühlung und Schmierung eines Getriebes
US9410514B2 (en) 2012-09-07 2016-08-09 Hitachi Automotive Systems, Ltd. Variable displacement oil pump
US20150285246A1 (en) 2013-01-21 2015-10-08 Toyota Jidosha Kabushiki Kaisha Variable displacement oil pump
DE102014221447A1 (de) * 2014-10-22 2016-04-28 Zf Friedrichshafen Ag Verstellpumpe

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