US20060222527A1 - Electric pump and fluid supply apparatus - Google Patents

Electric pump and fluid supply apparatus Download PDF

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Publication number
US20060222527A1
US20060222527A1 US11/354,894 US35489406A US2006222527A1 US 20060222527 A1 US20060222527 A1 US 20060222527A1 US 35489406 A US35489406 A US 35489406A US 2006222527 A1 US2006222527 A1 US 2006222527A1
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United States
Prior art keywords
opening portion
fluid
discharge port
communication
pump
Prior art date
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Abandoned
Application number
US11/354,894
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English (en)
Inventor
Hirotaka Kurita
Eiji Miyachi
Hideki Nakayoshi
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.)
Aisin Corp
Original Assignee
Aisin Seiki Co Ltd
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 Aisin Seiki Co Ltd filed Critical Aisin Seiki Co Ltd
Assigned to AISIN SEIKI KABUSHIKI KAISHA reassignment AISIN SEIKI KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KURITA, HIROTAKA, MIYACHI, EIJI, NAKAYOSHI, HIDEKI
Publication of US20060222527A1 publication Critical patent/US20060222527A1/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/0021—Generation or control of line pressure
    • F16H61/0025—Supply of control fluid; Pumps therefore
    • F16H61/0031—Supply of control fluid; Pumps therefore using auxiliary pumps, e.g. pump driven by a different power source than the engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
    • F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
    • F04C14/26—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves using bypass channels
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0057—Driving elements, brakes, couplings, transmission specially adapted for machines or pumps
    • F04C15/008—Prime movers
    • 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
    • F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C2/10—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member
    • F04C2/102—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of internal-axis type with the outer member having more teeth or tooth-equivalents, e.g. rollers, than the inner member the two members rotating simultaneously around their respective axes
    • 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
    • F04C2240/40—Electric motor
    • 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

Definitions

  • the present invention relates to an electric pump and a fluid supply apparatus which includes the electric pump. More particularly, the present invention pertains to an electric pump and a fluid supply apparatus which is constructed using the electric pump which drives a rotor housed in a pump body by a brushless sensorless motor in order to discharge fluid, which is sucked through an intake port provided at the pump body, through a discharge port.
  • Electric pumps for conveying fluid are applied, for example, to a continuously variable-speed transmission (CVT) for a vehicle and to a power steering device in order to supply working oil to a hydraulic pressure drive portion thereof.
  • CVT continuously variable-speed transmission
  • a known CVT includes a first pump, which is a mechanical pump, and a second pump, which is an electric pump, for a hydraulic pressure drive.
  • first pump which is a mechanical pump
  • second pump which is an electric pump
  • Electric pumps applied to a CVT for a vehicle is used in a high-temperature environment because of being assembled in the vicinity of the engine, and is used in a severe humidity environment because of water drops by rains, or the like.
  • a brushless motor may be applied.
  • brushless motors require a sensor for detecting an angular position of a rotor, and thus durability of the sensor is an issue.
  • a brushless sensorless motor is applied as an auxiliary hydraulic pressure supply device for the CVT (i.e., JP2002-27776A).
  • a compact synchronous motor with a permanent magnet is applied to the brushless sensorless motor.
  • a driver includes an inverter, and a direct current power from a battery is inverted into alternating current power to be inputted into the motor.
  • a voltage of the given alternating current power is constant
  • an electric current phase of the motor advances when a frequency is increased.
  • the motor is controlled using frequency.
  • a brushless sensorless motor uses counter electromotive force of the motor as a positional signal of a rotor in order to detect an angular position of the rotor.
  • drive electric power of a low frequency is applied to the motor from the driver. Accordingly, rotor is attracted, and the motor starts to rotate.
  • counter electromotive force is generated at the rotor synchronously to a rotation speed.
  • An angular position of the rotor is detected from a waveform of the counter electromotive force.
  • a rotation frequency of the rotor is detected from the waveform of the counter electromotive force, and an electric current is controlled so as to achieve a predetermined initial rotation speed.
  • Such motors can be applied to a brushless sensorless motor.
  • a further improved brushless sensorless motor is applied.
  • the drive electric power to be given to the rotor has to be a square wave.
  • the drive electric power is a sine wave
  • the counter electromotive force of the rotor cannot be detected.
  • an electric current control using a sine wave is more desirable than an electric voltage control using a square wave for a motor.
  • a motor which does not detect position thereof, applies electric power with sine wave from a driver thereto, detects a phase difference between an electric voltage and an electric current at a timing and controls frequency so that the phase difference becomes zero, and controls the electric current so that the frequency becomes a predetermined level, can be applied.
  • a pressure sensor may be provided at the discharge port of the electric pump, and the electric pump may be activated after confirming a decline of a working oil pressure.
  • providing an additional sensor complicates a construction of the CVT, increases manufacturing hours of the electric pump, and increases manufacturing cost.
  • the present invention provides an electric pump, which includes a pump body, an intake port formed in the pump body, a discharge port formed in the pump body for discharging fluid pumped from the intake port, a rotor housed in the pump body, a brushless sensorless motor which rotates the rotor, and a mechanism for preventing losing synchronism of the brushless sensorless motor by controlling hydraulic pressure in the discharge port not to exceed a predetermined pressure.
  • a fluid supply apparatus includes a first pump which pumps fluid from a fluid reservoir, a first supply passage for conveying pumped fluid to a destination of the fluid to be supplied, a relief valve provided on the first supply passage, the relief valve preventing an increase of fluid pressure in the first supply passage to be equal to or greater than a predetermined pressure, an intake port which pumps fluid from either the fluid reservoir or a separately provided fluid reservoir, an electric driven second pump having a discharge port for discharging pumped fluid, a second supply passage merged with the first supply passage between the first pump and the relief valve, a rotor provided on the second pump and electrically driven by a brushless sensorless motor, and a mechanism for preventing losing synchronism of the brushless sensorless motor by controlling hydraulic pressure in the discharge port not to exceed a predetermined pressure value lower than operational pressure of the relief valve.
  • FIG. 1A is a cross-sectional view of an electric pump according to an embodiment of the present invention.
  • FIG. 1B is a partial cross-sectional view of the electric pump where a mechanism D for preventing a losing synchronism is in operation according to the embodiment of the preset invention.
  • FIG. 2 is a schematic view of a fluid supply apparatus applied with the electric pump according to the embodiment of the present invention.
  • FIG. 3 is a graph explaining operational characteristics of the electric pump according to the embodiment of the present invention.
  • FIG. 4 is a partial cross-sectional view of a variation of an electric pump according to the embodiment of the present invention.
  • a pump body 1 of an electric pump includes a first housing 1 a, a second housing 1 b, and a third housing 1 c.
  • the first housing 1 a is provided with a motor 5 for rotating a rotor 4 , and a control means 6 for controlling the motor 5 .
  • a rotor 8 is provided on a first end of a rotational shaft 7 which is a part of the rotor 4 .
  • a permanent magnet 8 a is provided on an external periphery of the rotor 8 .
  • the rotor 8 is positioned in a recess portion 9 of the first housing 1 a.
  • An induction coil 10 is positioned enclosing the rotor 8 .
  • a known motor is applied as the motor 5 , which rotates the rotor 8 with sensor-less and brushless construction.
  • the second housing 1 b is arranged adjacent to the first housing 1 a in an extending direction of the rotational shaft 7 , and connected to the first housing 1 a.
  • a pump mechanism which includes an inner rotor 41 and an outer rotor 42 is provided at the second housing 1 b.
  • An outer gear formed on the inner rotor 41 is fitted to a second end of the rotation shaft 7 .
  • An outer rotor 42 which includes an inner gear is eccentrically engaged with the inner rotor 41 . Accordingly, a space 11 which is formed between the outer gear and the inner gear, because of the eccentric engagement of the inner gear 41 and the outer gear 42 , serves as a pump chamber.
  • An intake port 2 and a discharge port 3 which are configured to be in communication with the space 11 is formed on the second housing 1 b.
  • the third housing 1 c is arranged adjacent to the second housing 1 b in the extending direction of the rotational shaft 7 , and connected to the second housing 1 b.
  • the first housing 1 a, the second housing 1 b, and the third housing 1 c are connected by means of a connecting bolt 12 .
  • a mechanism D for preventing losing synchronism, which appropriately maintains a rotation of the rotor 4 by adjusting a discharge pressure of the fluid from the discharge port 3 is provided on the third housing 1 c.
  • the rotor 8 and the induction coil 10 are separated from each other (no-contact) in a brushless sensorless motor applied to the embodiment of the present invention, the rotor 8 and the induction coil 10 may lose synchronism when the fluid resistance which the rotor 4 receives is increased.
  • FIG. 3 A relationship between discharge pressure and amount of fluid when operating a brushless sensorless motor is as shown in FIG. 3 .
  • the discharge pressure of the fluid is shown at a horizontal axis, and the amount of fluid is shown at a vertical axis.
  • the amount of the fluid linearly declines in accordance with an increase of the pressure. Because an increase of the fluid pressure at the discharge port 3 corresponds to an increase of the resistance when the fluid is discharged, the discharged fluid amount is declined as a consequence.
  • the motor 5 performs an electric current control, and when a rotation speed of the rotor 8 declines in accordance with an increase of the discharge pressure, the control means 6 increases an electric current value that is to be applied to the induction coil 10 in order to increase rotation speed of the rotor 8 .
  • rotation of the rotor 8 starts to show a tendency of a losing synchronism.
  • a rotation of the rotor 8 and the rotor 4 is not immediately stopped, however, rotation speed of the rotor 8 and the rotor 4 is maintained to some degree, and working point of the discharge pressure and the amount of fluid moves to the right along line A.
  • the degree of pressure reaches pressure Pc
  • degree of losing synchronism becomes excessive, a rotation of the rotor 8 and the rotor 4 cannot be maintained, and the rotor 8 and the rotor 4 stop the rotation.
  • the electric pump according to the embodiment of the present invention includes the mechanism D for preventing losing synchronism which restrains an increase of pressure at the discharge port 3 .
  • a cylinder 15 including an opening portion 13 at discharge side which is in communication with the discharge port 3 and an opening portion 14 at intake side which is in communication with the intake port 2 is formed on the third housing 1 c.
  • An extending direction of the cylinder 15 is approximately perpendicular to an extending direction of the rotational shaft 7 .
  • the discharge port 3 and the intake port 2 which are provided at the second housing 1 b can be connected through the cylinder 15 unforcedly.
  • the third housing 1 c does not excessively project in the extending direction of the rotational shaft 7 , the electric motor can be constructed in compact.
  • the opening portion 13 at the discharge side is formed at side wall of the cylinder 15 to be in communication with the intake port 2 in a longitudinal direction of the cylinder. 15 .
  • the opening portion 14 at the intake side is formed at side wall of the cylinder 15 to be in communication with the discharge port 3 .
  • a piston 16 arranged inside the cylinder 15 is formed with a communication passage 17 which is formed in the piston 16 .
  • a first end of the communication passage 17 opens to a top portion of the piston 16 which faces the opening portion 13 at the discharge side.
  • a second end of the communication passage 17 opens to an external periphery surface of the piston 16 through plural holes (e.g., four holes) with even intervals along a periphery direction.
  • the piston 16 is constantly biased towards the opening portion 13 at the discharge side by means of a coil spring 18 a.
  • the piston 16 contacts the opening portion 13 at the discharge side (shown in FIG. 1A ).
  • the piston 16 is pushed to an opposite side of the opening portion 13 at the discharge side against biasing force of the coil spring 18 a serving as a biasing member 18 .
  • the communication of the opening portion 14 at the intake side with the intake port 2 is established through the communication passage 17 (i.e., shown in FIG. 1 b ).
  • the fluid inside of the discharge port 3 returns to the intake port 2 which is applied with the lower pressure than in the discharge port 3 , and a degree of the pressure at the discharge port 3 declines. Because of the decline of the fluid pressure at the discharge port 3 , resistance, which disturbs a rotation of the rotor 4 , is decreased, and a rotation of the rotor 4 is appropriately maintained.
  • the piston 16 When the pressure in the discharge port 3 increases during the operation of the electric pump, as shown in FIG. 3 , the working point of the pressure and the amount of fluid moves to the right on line A. However, by providing the mechanism D for preventing losing synchronism, the piston 16 is pushed to establish the communication between the intake port 2 and the discharge port 3 at timing when the pressure is increased to a predetermined level. As illustrated in FIG. 3 , the working point declines along line B when the pressure reaches a predetermined pressure Pa. That is, the discharge pressure when the communication between the discharge port 3 and the intake port 2 is established is the predetermined pressure Pa. In circumstances where the discharge pressure is further increased after exceeding the predetermined pressure Pa, the piston 16 is further pushed.
  • the discharge pressure of the fluid is gradually increased, and the amount of the fluid becomes zero when the discharge pressure reaches a predetermined pressure Pb.
  • the predetermined pressure Pb is determined within a range of discharge pressure by which the rotor 4 does not lose synchronism. More particularly, the predetermined pressure Pb is determined on the basis of dimensions of cross-section of the piston 16 and biasing force of the coil spring 18 a, or the like. For example, by changing the coil spring 18 a to another having different modulus of elasticity, the predetermined pressure Pb can be varied. As shown in FIG. 1 , the coil spring 18 a can be easily changed only by removing a plug bolt.
  • the electric pump can cope with a fluctuation of pressure at the discharge port 3 by using biasing force of the biasing member 18 without additionally providing a pressure sensor.
  • the electric pump can cope with a fluctuation of pressure at the discharge port 3 by using biasing force of the biasing member 18 without additionally providing a pressure sensor.
  • generation of a load exceeding operational limit of an electric pump can be prevented, losing synchronism of the brushless sensorless motor can be securely prevented.
  • fluid pressure which operates the piston 16 can be set at an appropriate value by adjusting biasing force of the biasing member 18 , a range of application of the electric pump can be widen.
  • the mechanism D for preventing losing synchronism is not limited to a construction where the fluid at the discharge port 3 returns to the intake port 2 .
  • a mechanism D′ for preventing losing synchronism including a piston 116 , a communication passage 117 , and a biasing member 118 is configured to establish a communication between an oil pan 120 and an opening portion 113 at the discharge side through the communication passage 117 .
  • Other construction of this variation is the same with the embodiment of the present invention. With this construction, the fluid at the discharge port 3 is discharged outside the pump body 1 , and is returned to the separately provided reservoir.
  • the mechanism D for preventing losing synchronism is not limited to a spool type in which the piston 16 and the cylinder 15 are applied, and other constructions can be applied.
  • a mechanism which is provided with other relief functions such as a valve body which swings, and a ball type check valve can be applied.
  • any mechanisms can be applied as long as the mechanism returns fluid in the discharge port 3 to the intake port 2 in accordance with an increase of the fluid pressure in the discharge port 3 , or the mechanism discharges fluid by establishing the communication between the discharge port 3 and the outside of the pump body 1 .
  • the electric pump is applied to an fluid supply apparatus for a CVT.
  • the fluid supply apparatus includes a first pump PI which pumps oil from an oil reservoir 20 a serving as a fluid reservoir 20 , and a first supply passage R 1 which conveys pumped oil to the CVT which is a destination of the oil.
  • the first pump PI is a mechanical pump which utilizes rotational force of a crankshaft of an engine, or the like.
  • a relief valve 21 which prevents that a degree of the oil pressure is increased to be equal to or greater than a predetermined pressure, is provided on the first supply passage Ri.
  • a second pump P 2 which pumps oil from the oil reservoir 20 a or from the separately provided oil reservoir 120 , and a second supply passage R 2 which includes a one-way valve 22 are provided.
  • a brushless sensorless motor which includes the mechanism D for preventing losing synchronism is applied to the second pump P 2 .
  • the second supply passage R 2 merges together with the first supply passage R 1 between the first pump P 1 and the relief valve 21 .
  • the second pump P 2 is, for example, applied for supplying working oil to the CVT at a stage where the engine stops.
  • it is required that the working oil is supplied immediately after the engine stops.
  • an oil pressure in the first supply passage RI maintains high pressure immediately after the engine stops.
  • the pressure in the discharge port 3 is high enough to be resistance against a start of the second pump P 2 , and drawbacks such as that the rotor 4 does not start to rotate or lose synchronism, or the like is caused.
  • the fluid supply apparatus includes the relief valve 21 which is provided at the first supply passage R 1 as a means for resolving an increase of the oil pressure, and the mechanism D for preventing losing synchronism provided at the second supply passage R 2 .
  • the relief valve 21 is capable of preventing supply of oil having an excessive pressure to the CVT which is the destination of the supplied oil. Because the first pump P 1 is a mechanical pump, the first pump PI can supply oil having high pressure easily. However, oil having high pressure is not necessarily required depending on a drive mechanism at a destination of the oil. Accordingly, the relief valve 21 is provided on the first supply passage R 1 in order to supply oil having an optimum pressure.
  • the one-way valve 22 provided at the second supply passage R 2 , oil having the high pressure does not reverse to the second pump P 2 side during the operation of the first pump P 1 .
  • the mechanism D for preventing losing synchronism provided at the second pump P 2 maintains a rotation of the rotor 4 by restraining an excessive load by the hydraulic pressure of oil.
  • the second pump P 2 assists the first pump P 1 to supply oil when the first pump P 1 is stopped or when oil to be supplied is at low temperature.
  • the second pump P 2 also assists the first pump P 1 to supply oil to the CVT in place of the first pump P 1 .
  • the second pump P 2 cannot be operated and drawbacks such as losing synchronism of the motor is likely caused even during the operation of the second pump P 2 .
  • the electric pump which is durable in the high temperature environment and high humidity environment can be obtained. Because the rotor and the induction circuit are not in contact each other with the brushless sensorless motor, the brushless sensorless motor is likely to lose synchronism in accordance with an increase of fluid pressure at the discharge port. However, with the construction in which a part of the fluid in the discharge port is either returned to the intake port or discharged to the outside of the pump body, hydraulic pressure in the discharge port can be set within a predetermined initial range. In a consequence, the electric pump, which effectively prevents losing synchronism of the brushless sensorless motor and excels in stable supply of the oil, can be obtained.
  • an increase of the fluid pressure in the discharge port can be restrained by the mechanism for preventing losing synchronism including the cylinder, the piston, and the biasing member, without providing a separate pressure sensor. Because the mechanism for preventing losing synchronism determines a position of the piston by balancing the biasing force of the biasing member and the hydraulic pressure in the discharge port, which is a simple structure, highly reliable device can be obtained. Further, because the setting of the hydraulic pressure to return the fluid in the discharge port can be easily changed, for example, by changing the biasing member to another having different modulus of elasticity, widely applicable electric pump can be obtained.
  • the fluid supply apparatus which includes an auxiliary function to supply fluid can be obtained, which is usable in the severe environment.
  • the rotor can securely start to rotate when the second pump is in operation. Further, because the rotor which once start to rotate securely maintains the rotation, the fluid supply apparatus which excels in operational stability can be obtained.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Details And Applications Of Rotary Liquid Pumps (AREA)
  • Rotary Pumps (AREA)
US11/354,894 2005-02-24 2006-02-16 Electric pump and fluid supply apparatus Abandoned US20060222527A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-049553 2005-02-24
JP2005049553A JP2006233867A (ja) 2005-02-24 2005-02-24 電動ポンプ及び流体供給装置

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US20060222527A1 true US20060222527A1 (en) 2006-10-05

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US11/354,894 Abandoned US20060222527A1 (en) 2005-02-24 2006-02-16 Electric pump and fluid supply apparatus

Country Status (4)

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US (1) US20060222527A1 (de)
EP (1) EP1705378A3 (de)
JP (1) JP2006233867A (de)
CN (1) CN100593899C (de)

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US20090175751A1 (en) * 2008-01-08 2009-07-09 Aisin Seiki Kabushiki Kaisha Electric pump
US20090196772A1 (en) * 2008-02-05 2009-08-06 Hitachi, Ltd. Oil Pump
US20100008797A1 (en) * 2006-12-19 2010-01-14 Jtekt Corporation Electric pump unit and electric oil pump
US20110095714A1 (en) * 2008-05-21 2011-04-28 Jtekt Corporation Electric pump device
US20130228148A1 (en) * 2010-11-19 2013-09-05 Jtekt Corporation Oil pump apparatus
CN103314215A (zh) * 2011-01-04 2013-09-18 株式会社捷太格特 电动泵设备
US20150300355A1 (en) * 2012-10-29 2015-10-22 Pierburg Pump Technology Gmbh Automotive electric liquid pump
US20160084372A1 (en) * 2012-10-31 2016-03-24 Allison Transmission, Inc. Engine-off auxiliary hydraulic pressurization system and method for a transmission
US20170097001A1 (en) * 2015-10-05 2017-04-06 Ebm-Papst St. Georgen Gmbh & Co. Kg Pump and motor combination
US10920771B2 (en) * 2016-02-15 2021-02-16 Bühler Motor GmbH Pump drive for conveying a reducing agent for motor vehicle exhaust gas systems, modular motor and pump family for forming different pump drives with several such electric motors
CN112761941A (zh) * 2021-01-19 2021-05-07 济南德创试验仪器有限公司 一种内啮合变量齿轮泵
US11988218B2 (en) 2021-03-10 2024-05-21 Multi Parts Supply Usa, Inc. Electric coolant pump with expansion compensating seal

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JP5511770B2 (ja) 2011-11-08 2014-06-04 三菱電機株式会社 電動ポンプ、及び電動ポンプの製造方法
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EP1705378A2 (de) 2006-09-27
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CN100593899C (zh) 2010-03-10
JP2006233867A (ja) 2006-09-07

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