JP2010116914A - Electric pump unit - Google Patents

Electric pump unit Download PDF

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Publication number
JP2010116914A
JP2010116914A JP2009084436A JP2009084436A JP2010116914A JP 2010116914 A JP2010116914 A JP 2010116914A JP 2009084436 A JP2009084436 A JP 2009084436A JP 2009084436 A JP2009084436 A JP 2009084436A JP 2010116914 A JP2010116914 A JP 2010116914A
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JP
Japan
Prior art keywords
motor
bearing
housing
rotor
cylindrical
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.)
Pending
Application number
JP2009084436A
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Japanese (ja)
Inventor
Hiroki Kagawa
Masahiko Kono
Takatoshi Sakata
晶彦 河野
隆敏 阪田
弘毅 香川
Original Assignee
Jtekt Corp
株式会社ジェイテクト
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
Priority to JP2008264791 priority Critical
Application filed by Jtekt Corp, 株式会社ジェイテクト filed Critical Jtekt Corp
Priority to JP2009084436A priority patent/JP2010116914A/en
Priority claimed from CN200980140311.5A external-priority patent/CN102177343B/en
Publication of JP2010116914A publication Critical patent/JP2010116914A/en
Pending legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide an electric pump unit capable of further downsizing and reduction in weight and cost.
An electric pump unit includes a cylindrical motor rotor 20 extending radially outward from one end of a pump drive motor shaft 16 cantilevered in a unit housing 1 by a bearing device 15 and surrounding an outer periphery of the bearing device 15. And a motor stator 22 fixed to the unit housing 1. The axial position of the center of gravity of the rotating portion including the motor shaft 16 and the motor rotor 20 is within the axial range of the bearing device 15.
[Selection] Figure 1

Description

  The present invention relates to a hydraulic pump unit used as, for example, a hydraulic pump of an automobile.

  In recent years, as a hydraulic pump for automobiles, it has been designed to save energy by finely controlling its start and stop, and to ensure the supply of hydraulic pressure to the drive system such as the transmission even when the engine is stopped due to idling stop In addition, an electric pump unit is used.

  Since the electric pump unit for automobiles is mounted in a limited space of the vehicle body, downsizing is required, and weight reduction and cost reduction are also required. As an electric pump unit that meets this requirement, an electric pump unit in which an electric motor and a pump are integrated in a common unit housing has been proposed (for example, see Patent Document 1).

Japanese Patent Laid-Open No. 2006-274821

  In the above conventional electric pump unit, two axial bearings of the pump drive motor shaft are supported by two rolling bearings arranged in the unit housing, and the motor rotor is disposed on the motor shaft portion located between these bearings. It is formed.

  Since this electric pump has a structure in which rolling bearings are arranged on both sides of the motor rotor, the length of the motor shaft is correspondingly increased, and there is a limit to downsizing. In addition, one bearing can be supported by a cylindrical portion formed integrally with a pump housing constituting the unit housing, but a member for supporting the other bearing is required, and the number of parts is increased. This is a factor that hinders weight and cost reduction.

  An object of the present invention is to provide an electric pump unit that solves the above-described problems and that can be made more compact and can be reduced in weight and cost.

  An electric pump unit according to the present invention includes a cylindrical motor rotor extending radially outward from one end of a pump drive motor shaft that is cantilevered by a bearing device in the unit housing, and fixed to the unit housing. And the axial position of the center of gravity of the rotating part including the motor shaft and the motor rotor is within the axial range of the bearing device.

  Since the motor rotor is provided so that one axial direction of the motor shaft is cantilevered by the bearing device and the outer periphery of the bearing device is surrounded, the length of the motor shaft can be shortened, and further compactness can be achieved. Is possible. In addition, since the axial position of the center of gravity of the rotating portion including the motor shaft and the motor rotor is within the axial range of the bearing device, the rotating portion can be stably supported and rotated.

  Preferably, the axial position of the center of gravity of the rotating portion is at the center of the axial range of the bearing device.

  In the electric pump unit of the present invention, for example, the unit housing includes a cylindrical motor housing and a pump housing connected to one end of the motor housing, and the pump housing has a small-diameter cylinder extending inside the motor housing. A bearing device is provided inside the cylindrical portion, and a motor stator is provided on the inner periphery of the motor housing.

  In this case, the bearing device can be supported only by the cylindrical portion formed integrally with the pump housing, and other members for supporting the bearing device are unnecessary. For this reason, the number of parts can be further reduced, and further weight reduction and cost reduction are possible.

  In the electric pump unit of the present invention, for example, the bearing device includes two rolling bearings adjacent in the axial direction.

  In this case, the rotating portion can be stably supported by the two rolling bearings, and the life of the rolling bearing is extended.

  Preferably, the axial position of the center of gravity of the rotating part is between the two rolling bearings.

  In the electric pump unit of the present invention, for example, the bearing device is composed of one needle roller bearing.

  Since the needle roller bearing has a certain length in the axial direction, the rotating portion can be stably supported.

  Preferably, the axial position of the center of gravity of the rotating portion is at the center of the axial length of the needle roller bearing.

  The electric motor constituting the electric pump unit is, for example, a DC brushless motor. There are two types of brushless motors, one that performs control by detecting the rotation angle (rotation position) of a motor shaft using a rotation angle sensor, and one that does not use a rotation angle sensor.

  In the pump unit of the present invention, for example, the rotor of the rotation angle sensor is provided on the outer periphery of the motor shaft radially inward from the cylindrical motor rotor, and the stator of the rotation angle sensor faces the rotor of the rotation angle sensor. It is provided on the side part.

  The rotation angle sensor is, for example, a resolver.

  Further, for example, the rotor of the rotation angle sensor is provided on the outer periphery of the motor shaft radially inward from the cylindrical motor rotor, and the stator of the rotation angle sensor is provided on the inner periphery of the cylindrical portion facing the rotor of the rotation angle sensor. It has been.

  In this way, the electric motor can be controlled by detecting the rotation angle of the motor shaft by the rotation angle sensor. Since the rotor of the rotation angle sensor and the stator are opposed to each other in the radial direction, an increase in the axial length of the electric pump unit can be suppressed and downsizing can be achieved.

  According to the electric pump unit of the present invention, it is possible to further reduce the size as described above.

  Further, further weight and cost reduction is possible.

FIG. 1 is a longitudinal sectional view of an electric pump unit showing a first embodiment of the present invention. FIG. 2 is a longitudinal sectional view of an electric pump unit showing a second embodiment of the present invention. FIG. 3 is a longitudinal sectional view of an electric pump unit showing a third embodiment of the present invention.

  Hereinafter, several embodiments in which the present invention is applied to a hydraulic pump of an automobile will be described with reference to the drawings.

  FIG. 1 is a longitudinal sectional view of an electric pump unit showing a first embodiment of the present invention. In the following description, the left side of the drawing is the front and the right side is the rear.

  The electric pump unit is a unit housing (1) in which a pump (2) and an electric motor (3) for rotationally driving the pump (2) are integrated. In this example, the controller (4) of the motor (3) is also incorporated in the housing (1). In this example, the pump (2) is a trochoid pump, and the motor (3) is a DC brushless sensorless motor having a three-phase winding.

  The unit housing (1) consists of a pump housing (5), pump plate (6), motor housing (7) and lid (8), and is waterproof by the pump housing (5), motor housing (7) and lid (8). A housing (9) is constructed.

  The pump housing (5) has a thick plate shape that extends in a direction perpendicular to the front-rear direction, and a pump chamber (10) having an open front is formed at the center thereof. A pump plate (6) is fixed to the front surface of the pump housing (5) via an O-ring (11), and the front surface of the pump chamber (10) is closed. An outer gear (12) constituting the pump (2) is rotatably accommodated in the pump chamber (10), and an inner gear (13) that meshes with the inner gear (12) is disposed inside the outer gear (12). Although not shown, the pump plate (6) is provided with an oil inlet and an oil outlet.

  The motor housing (7) has a cylindrical shape, and its front end is fixed to a portion near the outer periphery of the rear surface of the pump housing (5) via a seal (14). The rear end opening of the motor housing (7) is closed by the lid (8).

  A cylindrical portion (5a) having a smaller diameter than the motor housing (7) is integrally formed at the center of the rear end surface of the pump housing (5), and a bearing device (15) provided at the rear portion in the cylindrical portion (5a) A pump drive motor shaft (16) extending in the front-rear direction is cantilevered. In this example, the bearing device (15) includes two ball bearings (17) that are adjacent to the front and rear, and the inner ring (17a) of each bearing (17) is fixed to the motor shaft (16). The outer ring (17b) is fixed to the cylindrical portion (5a). The front part of the motor shaft (16) passes through the hole (18) formed in the rear wall of the pump housing (5) and enters the pump chamber (10), and the front end of the motor shaft (16) reaches the inner gear (13). It is connected. A seal (19) is provided between a portion of the cylindrical portion (5a) in front of the bearing device (15) and the motor shaft (16).

  A motor rotor (20) constituting the motor (3) is fixed to a rear end portion of the motor shaft (16) protruding rearward from the cylindrical portion (5a). The rotor (20) has a cylindrical shape extending in the radial direction from the rear end of the motor shaft (16) and surrounding the outer periphery of the bearing device (15), and a permanent magnet (21) is provided on the outer periphery. The axial position of the center of gravity of the rotating portion including the motor shaft (16), the rotor (20), and the inner gear (13) of the pump (2) is within the axial range of the bearing device (15). In this example, the axial position of the center of gravity is between the two ball bearings (17) constituting the bearing device (15).

  A motor stator (22) constituting the motor (3) is fixedly provided on the inner periphery of the motor housing (7) facing the rotor (20). In the stator (22), an insulator (synthetic resin insulator) (24) is incorporated in a core (23) made of laminated steel plates, and a coil (25) is wound around the insulator (24). In this example, the stator (22) is fixed to the inner periphery of the motor housing (7) by appropriate means such as adhesion.

  The substrate (26) of the controller (4) is fixed to the rear end of the insulator (24), and the component (27) constituting the controller (4) is mounted on the front surface of the substrate (26).

  In this electric pump unit, a motor shaft (16) is cantilevered in one axial direction by a bearing device (15), and a motor rotor (20) is provided so as to surround the outer periphery of the bearing device (15). Therefore, the length of the motor shaft (16) can be shortened, and further downsizing can be achieved. Further, since the axial position of the center of gravity of the rotating part including the motor shaft (16), the motor rotor (20) and the inner gear (13) of the pump (2) is within the axial range of the bearing device (15), the rotating part Can be stably rotated. Furthermore, since the position of the center of gravity in the axial direction is between the two ball bearings (17) constituting the bearing device (15), the rotating part can be supported in a more stable manner. Further, the bearing device (15) can be supported only by the cylindrical portion (5a) formed integrally with the pump housing (5), and no other member for supporting the bearing device (15) is required. For this reason, the number of parts can be further reduced, and further weight reduction and cost reduction are possible.

  FIG. 2 is a longitudinal sectional view of an electric pump unit showing a second embodiment of the present invention.

  The second embodiment has the same configuration as that of the first embodiment except for the bearing device (30). 2, parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

  In the second embodiment, the bearing device (30) is composed of one needle roller bearing (31). In this example, it is a needle roller bearing with a cage comprising a cage (31a) and a plurality of needle rollers (31b) supported thereby. The roller (31b) rolls between the outer peripheral surface of the motor shaft (16) and the cylindrical portion (5a), and both front and rear end surfaces of the cage (31a) are formed on the inner periphery of the cylindrical portion (5a). Further, the axial position of the bearing (31) is regulated by coming into contact with the front surface of the rearward annular end surface (32) and the radially extending portion of the rotor (20). The axial position of the center of gravity of the rotating part including the motor shaft (16), the rotor (20) and the inner gear (13) of the pump (2) is within the axial range of the bearing device (30). In this example, the axial position of the center of gravity is at the center of the axial length of the needle roller bearing (31) constituting the bearing device (30).

  In the case of the second embodiment, the needle roller bearing (31) has a certain length in the axial direction, so that the rotating part can be stably supported.

  FIG. 3 is a longitudinal sectional view of an electric pump unit showing a third embodiment of the present invention.

  In the third embodiment, the rotation angle (rotation position) of the motor shaft (16) is detected and controlled by the rotation angle sensor (33). Except for this point, the third embodiment has the same configuration as the first embodiment. Have. 3, parts corresponding to those in FIG. 1 are denoted by the same reference numerals.

  The rotation angle sensor (33) is provided in the unit housing (1). The rotation angle sensor (33) includes a rotor (33a) and a stator (33b), and is a resolver in this example. The sensor rotor (33a) is provided on the outer periphery of the motor shaft (16) radially inward from the cylindrical motor rotor (20), and the sensor stator (33b) is disposed on the unit housing (1) side facing the sensor rotor (33a). It is provided in the part. In this example, the sensor rotor (33a) is provided on the outer periphery of the motor shaft (16) between the bearing device (15) and the seal (19), and the sensor stator (33b) is opposed to the sensor rotor (33a). It is provided on the inner periphery of the cylindrical portion (5a) of (5). An electric wire (34) connected to the sensor stator (33b) is drawn out from the motor housing (7).

  In the case of the third embodiment, the rotation angle sensor (33) can detect the rotation angle of the motor shaft (19) to control the electric motor, and the rotor (33a) and stator ( Since 33b) is opposed in the radial direction, an increase in the axial length of the electric pump unit can be suppressed, and downsizing can be achieved.

  The overall configuration of the electric pump unit and the configuration of each unit are not limited to those of the above-described embodiment, and can be changed as appropriate.

  For example, in the above embodiment, the bearing device is configured by a rolling bearing, but the bearing device may be configured by a slide bearing.

  Moreover, this invention is applicable also to electric pump units other than the electric pump unit for motor vehicles.

(1) Unit housing
(5) Pump housing
(5a) Cylindrical part
(7) Motor housing
(15) (30) Bearing device
(16) Motor shaft
(17) Ball bearing
(20) Motor rotor
(22) Motor stator
(31) Needle roller bearings
(33) Rotation angle sensor
(33a) Rotor
(33b) Stator

Claims (6)

  1. A cylindrical motor rotor extending radially outward from one end of a pump drive motor shaft that is cantilevered by a bearing device within the unit housing and surrounding the outer periphery of the bearing device; and a motor stator fixed to the unit housing; With
    An electric pump unit characterized in that an axial position of a center of gravity of a rotating portion including a motor shaft and a motor rotor is within an axial range of the bearing device.
  2. The unit housing includes a cylindrical motor housing and a pump housing connected to one end of the motor housing,
    The pump housing is formed with a small-diameter cylindrical portion extending inside the motor housing, a bearing device is provided inside the cylindrical portion, and a motor stator is provided on the inner periphery of the motor housing. The electric pump unit according to claim 1.
  3.   The electric pump unit according to claim 1 or 2, wherein the bearing device comprises two rolling bearings adjacent in the axial direction.
  4.   The electric pump unit according to claim 1 or 2, wherein the bearing device comprises a single needle roller bearing.
  5.   The rotor of the rotation angle sensor is provided on the outer periphery of the motor shaft radially inward of the cylindrical motor rotor, and the stator of the rotation angle sensor is provided on the unit housing side portion facing the rotor of the rotation angle sensor. The electric pump unit according to claim 1.
  6.   The rotor of the rotation angle sensor is provided on the outer periphery of the motor shaft radially inward from the cylindrical motor rotor, and the stator of the rotation angle sensor is provided on the inner periphery of the cylindrical portion facing the rotor of the rotation angle sensor. The electric pump unit according to claim 2.
JP2009084436A 2008-10-14 2009-03-31 Electric pump unit Pending JP2010116914A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2008264791 2008-10-14
JP2009084436A JP2010116914A (en) 2008-10-14 2009-03-31 Electric pump unit

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2009084436A JP2010116914A (en) 2008-10-14 2009-03-31 Electric pump unit
CN200980140311.5A CN102177343B (en) 2008-10-14 2009-10-14 Electric pump unit
EP09820594.1A EP2336565B1 (en) 2008-10-14 2009-10-14 Electric pump unit
PCT/JP2009/067773 WO2010044416A1 (en) 2008-10-14 2009-10-14 Electric pump unit
US12/998,362 US8790095B2 (en) 2008-10-14 2009-10-14 Electric pump unit

Publications (1)

Publication Number Publication Date
JP2010116914A true JP2010116914A (en) 2010-05-27

Family

ID=42304723

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2009084436A Pending JP2010116914A (en) 2008-10-14 2009-03-31 Electric pump unit

Country Status (1)

Country Link
JP (1) JP2010116914A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2565376A2 (en) 2011-08-31 2013-03-06 Jtekt Corporation Electric pump unit
EP2597761A2 (en) 2011-11-25 2013-05-29 Jtekt Corporation Electric motor and electric unit including the same
EP2610492A1 (en) 2011-12-28 2013-07-03 Jtekt Corporation Motor control unit and electric pump unit
WO2013100017A1 (en) 2011-12-28 2013-07-04 株式会社ジェイテクト Motor control device and electric pump unit
JP2014031724A (en) * 2012-08-01 2014-02-20 Jtekt Corp Motor control device and electric pump unit
JP2014034932A (en) * 2012-08-09 2014-02-24 Jtekt Corp Motor control device and electric pump unit
JP2014034911A (en) * 2012-08-08 2014-02-24 Jtekt Corp Motor control device and electric pump unit
KR20140145490A (en) * 2013-06-13 2014-12-23 엘지이노텍 주식회사 Electric Pump
EP3183458B1 (en) 2014-08-18 2018-08-01 GETRAG B.V. & Co. KG Fluid supply device for a transmission for a motor vehicle

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5523343A (en) * 1978-08-07 1980-02-19 Hitachi Ltd Motor pump
JPH06346874A (en) * 1993-06-10 1994-12-20 Toshiba Ave Corp Fluid compressor
JP2002522696A (en) * 1998-08-06 2002-07-23 オートモウティヴ、モウシャン、テクノラジ、リミティド Motor driven pump
JP2004222342A (en) * 2003-01-09 2004-08-05 Nippon Densan Corp Motor and fuel supply pump equipped therewith
JP2005245199A (en) * 2004-02-27 2005-09-08 Daimler Chrysler Ag Oil pump driven by electric motor
JP2005256705A (en) * 2004-03-11 2005-09-22 Nippon Densan Corp Elongated centrifugal fan

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5523343A (en) * 1978-08-07 1980-02-19 Hitachi Ltd Motor pump
JPH06346874A (en) * 1993-06-10 1994-12-20 Toshiba Ave Corp Fluid compressor
JP2002522696A (en) * 1998-08-06 2002-07-23 オートモウティヴ、モウシャン、テクノラジ、リミティド Motor driven pump
JP2004222342A (en) * 2003-01-09 2004-08-05 Nippon Densan Corp Motor and fuel supply pump equipped therewith
JP2005245199A (en) * 2004-02-27 2005-09-08 Daimler Chrysler Ag Oil pump driven by electric motor
JP2005256705A (en) * 2004-03-11 2005-09-22 Nippon Densan Corp Elongated centrifugal fan

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013064395A (en) * 2011-08-31 2013-04-11 Jtekt Corp Electric pump unit
EP2565376A3 (en) * 2011-08-31 2014-12-17 Jtekt Corporation Electric pump unit
EP2565376A2 (en) 2011-08-31 2013-03-06 Jtekt Corporation Electric pump unit
US9422939B2 (en) 2011-11-25 2016-08-23 Jtekt Corporation Electric motor and electric unit including the same
EP2597761A2 (en) 2011-11-25 2013-05-29 Jtekt Corporation Electric motor and electric unit including the same
US9145876B2 (en) 2011-12-28 2015-09-29 Jtekt Corporation Motor control unit and electric pump unit
WO2013100017A1 (en) 2011-12-28 2013-07-04 株式会社ジェイテクト Motor control device and electric pump unit
US9683573B2 (en) 2011-12-28 2017-06-20 Jtekt Corporation Motor control apparatus and electric pump unit
EP2610492A1 (en) 2011-12-28 2013-07-03 Jtekt Corporation Motor control unit and electric pump unit
JP2014031724A (en) * 2012-08-01 2014-02-20 Jtekt Corp Motor control device and electric pump unit
JP2014034911A (en) * 2012-08-08 2014-02-24 Jtekt Corp Motor control device and electric pump unit
JP2014034932A (en) * 2012-08-09 2014-02-24 Jtekt Corp Motor control device and electric pump unit
KR20140145490A (en) * 2013-06-13 2014-12-23 엘지이노텍 주식회사 Electric Pump
KR102158264B1 (en) * 2013-06-13 2020-09-21 엘지이노텍 주식회사 Electric Pump
EP3183458B1 (en) 2014-08-18 2018-08-01 GETRAG B.V. & Co. KG Fluid supply device for a transmission for a motor vehicle

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