JP2019199872A - Electric pump - Google Patents

Electric pump Download PDF

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Publication number
JP2019199872A
JP2019199872A JP2018096552A JP2018096552A JP2019199872A JP 2019199872 A JP2019199872 A JP 2019199872A JP 2018096552 A JP2018096552 A JP 2018096552A JP 2018096552 A JP2018096552 A JP 2018096552A JP 2019199872 A JP2019199872 A JP 2019199872A
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Japan
Prior art keywords
pump
motor housing
rotor
housing
stator
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JP2018096552A
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JP7081298B2 (en
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藤川　透
Toru Fujikawa
透 藤川
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Aisin Corp
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Aisin Seiki Co Ltd
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Priority to JP2018096552A priority Critical patent/JP7081298B2/en
Priority to US16/403,663 priority patent/US20190353168A1/en
Priority to CN201910405507.8A priority patent/CN110500272B/en
Publication of JP2019199872A publication Critical patent/JP2019199872A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0606—Canned motor pumps
    • F04D13/0626—Details of the can
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0007—Radial sealings for working fluid
    • F04C15/0015—Radial sealings for working fluid of resilient material
    • 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
    • F04C15/0003—Sealing arrangements in rotary-piston machines or pumps
    • F04C15/0034—Sealing arrangements in rotary-piston machines or pumps for other than the working fluid, i.e. the sealing arrangements are not between working chambers of the machine
    • 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
    • F04C15/00—Component parts, details or accessories of machines, pumps or pumping installations, not provided for in groups F04C2/00 - F04C14/00
    • F04C15/0096—Heating; Cooling
    • 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
    • F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
    • F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
    • F04C18/10—Rotary-piston pumps specially adapted for elastic fluids 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
    • 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
    • F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
    • F04C29/04—Heating; Cooling; Heat insulation
    • F04C29/045—Heating; Cooling; Heat insulation of the electric motor in hermetic pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/08—Sealings
    • F04D29/086—Sealings especially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/005—Axial-flow pumps with a conventional single stage rotor
    • 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

Landscapes

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

Abstract

To provide an electric pump that can easily suppress deformation of a can.SOLUTION: An electric pump includes: a motor housing 32; a pump housing 12 adjacent to the motor housing 32; a rotor 34 that is accommodated in the motor housing 32 and is axially supported by a rotating shaft; a stator 33 that is disposed radially outside of the rotor 34 and is fixed to the motor housing 32; a pump unit that is accommodated in the pump housing 12, sucks in and discharges a fluid with rotation of the rotor 34; and a cup-shaped can 60 that is provided between the rotor 34 and the stator 33 to prevent the fluid in the pump unit from flowing into the stator 33. A seal member 65 is disposed between the can 60 and the motor housing 32, and a communication passage 70 for bringing the inner side of the can 60 and the outer side of the can 60 into communication with each other is formed between the motor housing 32 and the pump housing 12 and closer to an opening 61 side of the can 60 than the seal member 65.SELECTED DRAWING: Figure 3

Description

本発明は、電動ポンプに関する。   The present invention relates to an electric pump.

電動ポンプは、例えば、車両に搭載されるトランスミッション等の油圧装置に作動油を供給するために用いられる。こうした電動ポンプでは、モータ部の冷却効率を高めるために、電動ポンプから吐出される作動油の一部をモータ部のロータに流通させる場合がある。ただし、モータ部のステータに作動油が流入するとモータ部の動作に支障をきたすことになる。このため、作動油がステータに流入するのを防止するために、モータ部にはステータと回転軸に支持されたロータとの間にキャンが配置されている（例えば、特許文献１）。   An electric pump is used, for example, to supply hydraulic oil to a hydraulic device such as a transmission mounted on a vehicle. In such an electric pump, in order to increase the cooling efficiency of the motor unit, a part of the hydraulic oil discharged from the electric pump may be distributed to the rotor of the motor unit. However, if hydraulic oil flows into the stator of the motor unit, the operation of the motor unit will be hindered. For this reason, in order to prevent hydraulic oil from flowing into the stator, a can is disposed between the stator and the rotor supported by the rotating shaft in the motor unit (for example, Patent Document 1).

特開２０１５−２１８６５０号公報Japanese Patent Laying-Open No. 2015-218650

電動ポンプは、ステータとロータとの間の距離が小さいほどモータ効率を高めることができる。このため、ステータとロータとの間に配置されるキャンは可能な限り肉厚が薄い方が望ましい。キャンは、ロータに流入した作動油がステータに向けて流出しないようにその内部はポンプ部以外の外部とは遮断される密閉空間として構成されている。このため、ポンプ部からキャンの内部に作動油が流入することでキャンの内部において油圧が上昇する。キャンが薄い肉厚で構成されている場合には、キャンは内部の油圧上昇の影響を受けて変形する虞があり、変形量が増大することでキャンが破損する虞もある。そうなると、電動ポンプにおいてモータ部の機能が大きく損なわれる。   The electric pump can increase the motor efficiency as the distance between the stator and the rotor is smaller. For this reason, it is desirable that the can disposed between the stator and the rotor is as thin as possible. The can is configured as a sealed space in which the inside of the can is blocked from the outside other than the pump portion so that the hydraulic oil flowing into the rotor does not flow out toward the stator. For this reason, when the hydraulic oil flows from the pump unit into the can, the hydraulic pressure increases inside the can. When the can has a thin wall thickness, the can may be deformed due to an increase in internal hydraulic pressure, and the can may be damaged due to an increase in the amount of deformation. Then, the function of the motor unit is greatly impaired in the electric pump.

上記実情に鑑み、キャンの変形を容易に抑制することができる電動ポンプが望まれている。   In view of the above circumstances, an electric pump that can easily suppress deformation of a can is desired.

本発明に係る電動ポンプの特徴構成は、モータハウジングと、前記モータハウジングに隣接するポンプハウジングと、前記モータハウジングに収容され、回転軸によって軸支されるロータと、前記ロータの径方向外側に配置され、前記モータハウジングに固定されるステータと、前記ポンプハウジングに収容され、前記ロータの回転によって流体を吸入及び吐出するポンプ部と、前記ロータと前記ステータとの間に設けられ、前記ポンプ部の流体が前記ステータに流入することを防止するカップ状のキャンと、を備え、前記キャンと前記モータハウジングとの間にシール部材が配置されるとともに、前記モータハウジングと前記ポンプハウジングとの間であって、前記シール部材よりも前記キャンの開口側に、前記キャンの内部側と前記キャンの外部側とを連通させる連通路が形成されている点にある。   The characteristic configuration of the electric pump according to the present invention includes a motor housing, a pump housing adjacent to the motor housing, a rotor housed in the motor housing and pivotally supported by a rotating shaft, and arranged on a radially outer side of the rotor. A stator that is fixed to the motor housing, a pump unit that is housed in the pump housing and sucks and discharges fluid by rotation of the rotor, and is provided between the rotor and the stator. A cup-shaped can that prevents fluid from flowing into the stator, and a seal member is disposed between the can and the motor housing, and between the motor housing and the pump housing. In addition, the inner side of the can and the cam are closer to the opening side of the can than the seal member. Lies in the communication passage for communicating are formed and the outer side of the.

本構成によると、ポンプ部の流体は、キャンと、キャンとモータハウジングとの間に配置されたシール部材とによって、ポンプ部の流体がモータ部のロータに流入した場合でも、ステータに流入することが防止される。ここで、モータ部では、キャンの内部（ロータ）に流体が流入した場合、キャンの内部は流体量が増すことで流体圧が高くなることがある。そこで、本構成では、キャンの開口側にキャンの内部側とキャンの外部側とを連通させる連通路が形成されている。この連通路によって、キャンの内部に流入した流体をキャンの外部に容易に流出させることができる。これにより、キャンの内部は流体が流入しても流体圧の上昇が抑制されるため、キャンの肉厚が薄い場合であっても、キャンの変形を効果的に抑制することができる。その結果、電動ポンプは、キャンの肉厚を薄くしてモータ効率を高めることができる。   According to this configuration, the fluid in the pump part flows into the stator even when the fluid in the pump part flows into the rotor of the motor part by the can and the seal member disposed between the can and the motor housing. Is prevented. Here, in the motor unit, when fluid flows into the can (rotor), the fluid pressure in the can may increase due to an increase in the amount of fluid. Therefore, in this configuration, a communication path that connects the inner side of the can and the outer side of the can is formed on the opening side of the can. With this communication path, the fluid that has flowed into the can can easily flow out of the can. Thereby, even if a fluid flows into the inside of the can, the increase in fluid pressure is suppressed, so that even if the thickness of the can is thin, the deformation of the can can be effectively suppressed. As a result, the electric pump can increase the motor efficiency by reducing the thickness of the can.

他の特徴構成は、前記キャンは、開口側の端部に、前記モータハウジングと前記ポンプハウジングとの間を径方向外側に向かって延出するフランジを有し、前記シール部材は、弾性変形可能であって、前記モータハウジングと前記フランジとの間に配置され、前記キャンの前記フランジは、前記モータハウジングと間に間隙を有する状態で前記シール部材に当接するように構成され、前記間隙が狭くなることにより前記連通路が形成される点にある。   According to another characteristic configuration, the can has a flange extending radially outward between the motor housing and the pump housing at an end on the opening side, and the seal member is elastically deformable. The flange of the can is disposed between the motor housing and the flange, and the flange of the can is configured to contact the seal member with a gap between the motor housing and the gap is narrow. Thus, the communication path is formed.

本構成によれば、キャンのフランジは、シール部材に当接し、モータハウジングとは離間している。ここで、キャンの内部が流体量の増加によって流体圧が上昇すると、流体圧がキャンのフランジに作用してフランジがシール部材を押圧する。このとき、シール部材が弾性変形することで、フランジはモータハウジングに近接する。すなわち、フランジとモータハウジングとの間隙が狭くなり、フランジとポンプハウジングの端面との間にはキャンの内部とキャンの外部とを連通させる連通路が形成される。これにより、キャンの内部に流体が流入しても連通路から流体が排出可能になるため、キャンの内部において流体圧の上昇が抑制される。その結果、キャンが肉厚の薄い形状である場合でも、キャンの変形を効果的に抑制することができる。
また、キャンは、フランジがポンプハウジングの端面に当接した状態で配置されることで、キャンの内部を密閉空間として構成することができる。このように構成することで、キャンの外部からの内部への異物の混入を防止することもできる。 According to this configuration, the flange of the can contacts the seal member and is separated from the motor housing. Here, when the fluid pressure rises due to an increase in the amount of fluid inside the can, the fluid pressure acts on the flange of the can and the flange presses the seal member. At this time, the flange is close to the motor housing due to the elastic deformation of the seal member. That is, the gap between the flange and the motor housing is narrowed, and a communication path is formed between the flange and the end face of the pump housing to allow communication between the inside of the can and the outside of the can. Thereby, even if the fluid flows into the can, the fluid can be discharged from the communication path, so that an increase in the fluid pressure is suppressed inside the can. As a result, even when the can has a thin shape, the deformation of the can can be effectively suppressed.
In addition, the can can be configured as a sealed space by arranging the can in a state where the flange is in contact with the end face of the pump housing. By comprising in this way, mixing of the foreign material to the inside from the outside of a can can also be prevented.

本発明に係る電動ポンプの断面図である。It is sectional drawing of the electric pump which concerns on this invention. 電動ポンプの要部断面図である。It is principal part sectional drawing of an electric pump. 電動ポンプの要部断面図である。It is principal part sectional drawing of an electric pump. キャンの斜視図である。It is a perspective view of a can. 別実施形態の電動ポンプの要部断面図である。It is principal part sectional drawing of the electric pump of another embodiment.

以下、本発明の実施形態を図面に基づいて説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１に示すように、電動ポンプ１は、ポンプ部１０とモータ部３０とドライバ部５０から構成されている。電動ポンプ１は、例えば車両のトランスミッション等に作動油を供給するオイルポンプとして用いられる。尚、電動ポンプ１は作動油以外の流体の供給に使用しても良い。   As shown in FIG. 1, the electric pump 1 includes a pump unit 10, a motor unit 30, and a driver unit 50. The electric pump 1 is used, for example, as an oil pump that supplies hydraulic oil to a vehicle transmission or the like. The electric pump 1 may be used for supplying fluid other than hydraulic oil.

ポンプ部１０は、一端面に円形の収納凹部１８が形成されたポンプハウジング１２と、ポンプハウジング１２の収納凹部１８が形成された端面を覆うポンプカバー１１より構成されている。ポンプハウジング１２とポンプカバー１１とは共にアルミ合金製である。ポンプハウジング１２には収納凹部１８の中心から偏心した軸受孔１９が形成されている。軸受孔１９には回転軸１５が挿入され、軸受孔１９によって回転軸１５が回転自在に支持されている。   The pump unit 10 includes a pump housing 12 in which a circular storage recess 18 is formed on one end surface, and a pump cover 11 that covers an end surface of the pump housing 12 in which the storage recess 18 is formed. Both the pump housing 12 and the pump cover 11 are made of an aluminum alloy. A bearing hole 19 that is eccentric from the center of the housing recess 18 is formed in the pump housing 12. A rotation shaft 15 is inserted into the bearing hole 19, and the rotation shaft 15 is rotatably supported by the bearing hole 19.

収納凹部１８内に設けられたポンプ１４は、外歯を成すインナロータ２２と、これと噛合する内歯を成すアウタロータ２３から構成されている。アウタロータ２３は外周面が収納凹部１８に支持され、回転自在になっている。インナロータ２２は回転軸１５と同軸芯となるように回転軸１５の一方の端部に圧入固着されている。回転軸１５のインナロータ２２が固着された側と反対側の端部は、ポンプハウジング１２からモータ部３０に向けて突出している。   The pump 14 provided in the storage recess 18 includes an inner rotor 22 that forms external teeth and an outer rotor 23 that forms internal teeth that mesh with the inner rotor 22. The outer surface of the outer rotor 23 is supported by the storage recess 18 and is rotatable. The inner rotor 22 is press-fitted and fixed to one end of the rotary shaft 15 so as to be coaxial with the rotary shaft 15. An end of the rotating shaft 15 opposite to the side to which the inner rotor 22 is fixed protrudes from the pump housing 12 toward the motor unit 30.

互いに噛合するインナロータ２２、アウタロータ２３の歯部の間には、回転に伴い容積が増減するポンプ室２４が形成されている。ポンプカバー１１には、ポンプ室２４の作動油が吐出される吐出路２５及び作動油が吸入される吸入路２６が貫通形成されている。   Between the teeth of the inner rotor 22 and the outer rotor 23 that mesh with each other, a pump chamber 24 whose volume increases or decreases with rotation is formed. The pump cover 11 is formed with a discharge passage 25 through which the hydraulic oil in the pump chamber 24 is discharged and a suction passage 26 through which the hydraulic oil is sucked.

モータ部３０は、モータハウジング３２に、環状のステータ３３と、ステータ３３の内周面から所定の隙間をおいてその径方向内側に位置する円筒状のロータ３４とを収容して構成されている。ロータ３４は回転軸１５に軸支されている。モータハウジング３２はポンプハウジング１２に隣接して設けられる。ステータ３３及びロータ３４は、いずれも回転軸１５の軸芯と同軸である。ロータ３４は、電磁鋼板の薄板を積層して形成されるロータコア３５と、ロータコア３５を貫通する複数のスロットに収容される永久磁石３６とを備えている。ロータ３４は、モータハウジング３２に固定されたステータ３３と対向するように、ステータ３３の径方向内側に配設される。   The motor unit 30 is configured such that a motor housing 32 accommodates an annular stator 33 and a cylindrical rotor 34 that is located radially inward with a predetermined gap from the inner peripheral surface of the stator 33. . The rotor 34 is pivotally supported on the rotary shaft 15. The motor housing 32 is provided adjacent to the pump housing 12. The stator 33 and the rotor 34 are both coaxial with the axis of the rotating shaft 15. The rotor 34 includes a rotor core 35 formed by laminating thin electromagnetic steel plates and permanent magnets 36 accommodated in a plurality of slots penetrating the rotor core 35. The rotor 34 is disposed on the radially inner side of the stator 33 so as to face the stator 33 fixed to the motor housing 32.

ステータ３３は、電磁鋼板を積層したステータコア３９と絶縁体からなるコイル支持枠４１に巻回されたコイル４０から構成されている。ステータ３３の内周側には、ロータ３４との間に円筒空間３７が形成されている。   The stator 33 includes a stator core 39 in which electromagnetic steel plates are laminated and a coil 40 wound around a coil support frame 41 made of an insulator. A cylindrical space 37 is formed between the stator 33 and the rotor 34 on the inner peripheral side.

モータ部３０に対して、ポンプ部１０とは反対の側にドライバ部５０が設けられている。ドライバ部５０は、モータハウジング３２とカバー部５１とを組み合わせることで形成されるドライバ収容部５２に、電子部品が実装されたプリント基板５３が配置されて構成される。ドライバ部５０はステータ３３のコイル４０に通電して交番磁界を発生させ、ロータ３４を回転させる。ロータ３４の回転により回転軸１５を介してインナロータ２２が回転し、それに伴いアウタロータ２３が連れ回りする。これにより、吸入路２６を流通する作動油はポンプ室２４に吸入され、吐出路２５から吐出される。   A driver unit 50 is provided on the opposite side of the motor unit 30 from the pump unit 10. The driver unit 50 is configured by arranging a printed circuit board 53 on which electronic components are mounted in a driver housing unit 52 formed by combining the motor housing 32 and the cover unit 51. The driver unit 50 energizes the coil 40 of the stator 33 to generate an alternating magnetic field, and rotates the rotor 34. Due to the rotation of the rotor 34, the inner rotor 22 rotates through the rotating shaft 15, and the outer rotor 23 rotates with the rotation. As a result, the hydraulic oil flowing through the suction passage 26 is sucked into the pump chamber 24 and discharged from the discharge passage 25.

ロータ３４は円筒空間３７には、図４に示される、カップ状のキャン６０が配置されている。キャン６０は、非磁性体（例えば、ステンレス）等の板材によって構成され、有底筒状に形成されている。キャン６０は、円筒空間３７の内径とほぼ同じ外周径を有し、その側面はステータ３３とロータ３４との間に設けられる。すなわち、キャン６０の内部にロータ３４が収容されている。キャン６０は、ポンプ部１０の側に開口６１を有し、開口６１の側にフランジ６２を備える。フランジ６２はモータハウジング３２とポンプハウジング１２との間を径方向外側に向かって延出している。フランジ６２と、モータハウジング３２のポンプ部１０の側の端面４２との間にシール部材６５が配置されている。シール部材６５は、例えば弾性変形可能なＯリングで構成されており、端面４２に形成された円形の溝部４３にその一部が収容される。キャン６０のフランジ６２とフランジ６２に対向する端面４２との間には間隙７３が形成されている。キャン６０は、シール部材６５にフランジ６２が当接した状態で、フランジ６２がシール部材６５の弾性力によりポンプハウジング１２のモータ部３０の側の端面２７に押し付けられて保持される（図２参照）。   The rotor 34 is provided with a cup-shaped can 60 shown in FIG. The can 60 is made of a plate material such as a non-magnetic material (for example, stainless steel) and has a bottomed cylindrical shape. The can 60 has substantially the same outer diameter as the inner diameter of the cylindrical space 37, and its side surface is provided between the stator 33 and the rotor 34. That is, the rotor 34 is accommodated in the can 60. The can 60 has an opening 61 on the pump unit 10 side and a flange 62 on the opening 61 side. The flange 62 extends radially outward between the motor housing 32 and the pump housing 12. A seal member 65 is disposed between the flange 62 and the end face 42 of the motor housing 32 on the pump unit 10 side. The seal member 65 is composed of, for example, an elastically deformable O-ring, and a part thereof is accommodated in a circular groove 43 formed in the end face 42. A gap 73 is formed between the flange 62 of the can 60 and the end face 42 facing the flange 62. The can 60 is held by pressing the flange 62 against the end surface 27 of the pump housing 12 on the motor portion 30 side by the elastic force of the seal member 65 in a state where the flange 62 is in contact with the seal member 65 (see FIG. 2). ).

ポンプ１４が回転し作動油がポンプ室２４に吸入されると、ポンプ室２４内の作動油の一部は軸受孔１９と回転軸１５の隙間を流通し、キャン６０の内部に流入する。キャン６０の内部への作動油の流入量が少なく、キャン６０の内部の油圧が低圧状態のときは、図２に示すように、キャン６０のフランジ６２は、シール部材６５によってポンプハウジング１２のモータ部３０の側の端面２７に押し付けられる。これにより、キャン６０の内部はポンプ部１０以外の外部に対して密閉状態が維持される。   When the pump 14 rotates and hydraulic oil is sucked into the pump chamber 24, part of the hydraulic oil in the pump chamber 24 flows through the gap between the bearing hole 19 and the rotary shaft 15 and flows into the can 60. When the amount of hydraulic oil flowing into the can 60 is small and the oil pressure inside the can 60 is in a low pressure state, the flange 62 of the can 60 is sealed by the motor of the pump housing 12 by the seal member 65 as shown in FIG. It is pressed against the end surface 27 on the part 30 side. Thereby, the inside of the can 60 is kept sealed with respect to the outside other than the pump unit 10.

一方、電動ポンプ１の作動中に、キャン６０の内部に作動油が流入してキャン６０の内部の油圧が上昇して高圧状態になると、図３に示すように、フランジ６２に作動油の油圧が作用して、フランジ６２はシール部材６５をモータハウジング３２の端面４２に向けて押し上げる。このとき、シール部材６５は圧縮され弾性変形して、フランジ６２はモータハウジング３２の端面４２に近接する。すなわち、フランジ６２とモータハウジング３２の端面４２との間隙７３が狭くなり、フランジ６２とポンプハウジング１２の端面２７との間にはキャン６０の内部側（ロータ３４が収容された側）とキャン６０の外部側とを連通させる連通間隙７０（連通路の一例）が形成される。こうして、フランジ６２と、ポンプハウジング１２のモータ部３０の側の端面２７との間に連通路としての連通間隙７０が形成される。これにより、キャン６０の内部に作動油が流入して高圧状態になっても連通間隙７０からキャン６０の外部側に向けて作動油が排出されるため、キャン６０の内部においてそれ以上の油圧の上昇が抑制される。その結果、キャン６０が肉厚の薄い形状である場合でも、キャン６０の変形を効果的に抑制することができる。   On the other hand, when the hydraulic oil flows into the can 60 during the operation of the electric pump 1 and the hydraulic pressure inside the can 60 rises to a high pressure state, as shown in FIG. The flange 62 pushes up the seal member 65 toward the end face 42 of the motor housing 32. At this time, the seal member 65 is compressed and elastically deformed, and the flange 62 is close to the end face 42 of the motor housing 32. That is, the gap 73 between the flange 62 and the end surface 42 of the motor housing 32 is narrowed, and between the flange 62 and the end surface 27 of the pump housing 12, the inner side of the can 60 (the side where the rotor 34 is accommodated) and the can 60. A communication gap 70 (an example of a communication path) is formed that communicates with the outside. Thus, a communication gap 70 as a communication path is formed between the flange 62 and the end surface 27 of the pump housing 12 on the motor unit 30 side. As a result, even if the hydraulic oil flows into the can 60 and reaches a high pressure state, the hydraulic oil is discharged from the communication gap 70 toward the outside of the can 60. The rise is suppressed. As a result, even when the can 60 has a thin shape, the deformation of the can 60 can be effectively suppressed.

図２、図３に示すように、モータハウジング３２とポンプハウジング１２とは、モータハウジング３２の厚さより厚いカラー８０により端面４２と端面２７との間に間隙７２を有した状態で、ボルト８１により締結され固定されている。したがって、連通間隙７０を流通してキャン６０の外部に到達したキャン６０の内部の作動油は、更に間隙７２を流通して電動ポンプ１の外部に排出される。作動油が電動ポンプ１の外部に排出されても、電動ポンプ１が例えば油槽の中に配置される場合には、電動ポンプ１の外部に排出された作動油は油槽に排出されるため何ら問題はない。電動ポンプ１が例えば油槽の外側に取付けられる場合には、電動ポンプ１の外部に排出された作動油を、不図示の油路を介してオイルパン（不図示）や吸入路２６に戻すように構成してもよい。   As shown in FIGS. 2 and 3, the motor housing 32 and the pump housing 12 are attached by bolts 81 with a gap 72 between the end face 42 and the end face 27 by a collar 80 thicker than the thickness of the motor housing 32. Fastened and secured. Accordingly, the hydraulic oil inside the can 60 that has flowed through the communication gap 70 and reached the outside of the can 60 further flows through the gap 72 and is discharged to the outside of the electric pump 1. Even if the hydraulic oil is discharged to the outside of the electric pump 1, if the electric pump 1 is disposed in, for example, an oil tank, the hydraulic oil discharged to the outside of the electric pump 1 is discharged to the oil tank, so there is no problem. There is no. When the electric pump 1 is attached to the outside of the oil tank, for example, the hydraulic oil discharged to the outside of the electric pump 1 is returned to an oil pan (not shown) or the suction path 26 through an oil path (not shown). It may be configured.

図２に示す状態において、シール部材６５における、フランジ６２に対して垂直となる方向の長さを高さＨとし、モータハウジング３２の端面４２とキャン６０のフランジ６２との間の間隙７３の大きさを幅Ｔとした場合、シール部材６５の高さＨに対して、「幅Ｔ／高さＨ」が５〜５０％になるように幅Ｔが構成される。「幅Ｔ／高さＨ」が５％未満であると、間隙７３が小さすぎて、間隙７３が狭くなっても連通間隙７０の大きさを十分に確保できないため、キャン６０の内部から作動油を適正に排出することができない。一方、「幅Ｔ／高さＨ」が５０％超であると、シール部材６５が端面４２の溝部４３からはみ出やすくなり、シール部材６５によるシール機能が損なわれるおそれがある。   In the state shown in FIG. 2, the length of the seal member 65 in the direction perpendicular to the flange 62 is a height H, and the size of the gap 73 between the end face 42 of the motor housing 32 and the flange 62 of the can 60 is large. When the height is the width T, the width T is configured such that “width T / height H” is 5 to 50% with respect to the height H of the seal member 65. If the “width T / height H” is less than 5%, the gap 73 is too small, and even if the gap 73 becomes narrow, the size of the communication gap 70 cannot be secured sufficiently. Cannot be discharged properly. On the other hand, if “width T / height H” exceeds 50%, the sealing member 65 tends to protrude from the groove 43 of the end face 42, and the sealing function by the sealing member 65 may be impaired.

〔第２実施形態〕
図５に示すように、第２実施形態では、ポンプハウジング１２の端面２７に、フランジ６２の延出方向に沿って溝部２８が形成され、溝部２８はキャン６０の内部側とキャン６０の外部側とを連通させる連通路７１を構成している。連通路７１は、モータハウジング３２の端面４２とポンプハウジング１２の端面２７との間に形成された間隙７２に連通している。連通路７１によりキャン６０の内部の油圧に関係なく、キャン６０の内部側とキャン６０の外部側とが常時連通している。これにより、キャン６０の内部に流入した作動油は、連通路７１および間隙７２を介して電動ポンプ１の外部に排出することができる。連通路７１（溝部２８）は、１つだけ形成されていてもいいし、複数形成されていてもよい。 [Second Embodiment]
As shown in FIG. 5, in the second embodiment, a groove portion 28 is formed in the end surface 27 of the pump housing 12 along the extending direction of the flange 62, and the groove portion 28 is formed on the inner side of the can 60 and the outer side of the can 60. The communication path 71 is configured to communicate with each other. The communication path 71 communicates with a gap 72 formed between the end surface 42 of the motor housing 32 and the end surface 27 of the pump housing 12. Regardless of the hydraulic pressure inside the can 60, the inside of the can 60 and the outside of the can 60 are always in communication with each other by the communication path 71. As a result, the hydraulic oil that has flowed into the can 60 can be discharged to the outside of the electric pump 1 through the communication passage 71 and the gap 72. Only one communication passage 71 (groove portion 28) may be formed, or a plurality of communication passages 71 (groove portions 28) may be formed.

本実施形態では、キャン６０の内部に流入された作動油の量が少なく油圧が低圧状態のときであっても、連通路７１によって作動油をキャン６０の外部に排出可能である。このため、キャン６０の内部は、作動油の流入量が増加しても連通路７１から作動油が排出されることで油圧の上昇が抑制されるため、低圧状態の維持が可能になる。これにより、キャン６０の肉厚が第１実施形態と比較して薄い場合であっても、キャン６０の変形を効果的に抑制することができる。その結果、電動ポンプ１は、キャン６０の肉厚を薄くしてモータ効率を高めることができる。   In the present embodiment, the hydraulic oil can be discharged to the outside of the can 60 by the communication passage 71 even when the amount of the hydraulic oil flowing into the can 60 is small and the hydraulic pressure is low. For this reason, the inside of the can 60 can maintain the low pressure state because the increase in hydraulic pressure is suppressed by discharging the hydraulic oil from the communication passage 71 even if the inflow amount of the hydraulic oil increases. Thereby, even if it is a case where the thickness of the can 60 is thin compared with 1st Embodiment, a deformation | transformation of the can 60 can be suppressed effectively. As a result, the electric pump 1 can increase the motor efficiency by reducing the wall thickness of the can 60.

なお、本実施形態では、連通路７１の存在により、キャン６０の内部側と外部側とが常時連通した状態であるため、電動ポンプ１の外部から連通路７１を介して異物が侵入したりエアが流入したりする可能性がある。このため、異物の侵入を防止しエアの流入をできるだけ抑制する上で、連通路７１（溝２８部）の深さは可能な限り浅いことが好ましい。また、電動ポンプ１の外部からの異物の侵入を防止するために、電動ポンプ１の連通路７１に連続する通路の所定箇所に異物捕集用のフィルタを配置してもよい。   In the present embodiment, because of the presence of the communication passage 71, the inside and outside of the can 60 are always in communication with each other, so that foreign matter may enter from the outside of the electric pump 1 via the communication passage 71 or air May flow in. For this reason, it is preferable that the depth of the communication path 71 (groove 28 portion) is as shallow as possible in order to prevent the intrusion of foreign matter and suppress the inflow of air as much as possible. In addition, in order to prevent foreign matter from entering from the outside of the electric pump 1, a foreign matter collecting filter may be disposed at a predetermined position in a passage continuing to the communication passage 71 of the electric pump 1.

〔別実施形態〕
（１）上記の第２実施形態では、連通路７１を形成するためにポンプハウジング１２の端面２７に溝部２８を形成する例を示したが、キャン６０のフランジ６２に溝部を形成して連通路としてもよく、端面２７及びフランジ６２の両方に溝部を形成して連通路７１を構成してもよい。 [Another embodiment]
(1) In the second embodiment, the example in which the groove portion 28 is formed in the end surface 27 of the pump housing 12 in order to form the communication passage 71 is shown. However, the groove portion is formed in the flange 62 of the can 60 and the communication passage is formed. Alternatively, the communication path 71 may be configured by forming grooves on both the end face 27 and the flange 62.

（２）上記の実施形態では、キャン６０がフランジ６２を有する形状の例を示したが、キャン６０はフランジ６２を有さずに構成してもよい。この場合は、キャン６０の開口６１の端部の少なくとも一部とポンプハウジング１２の端面２７との間に、キャン６０の内部側とキャン６０の外部側とを連通させる連通路が形成される。当該連通路は、キャン６０の開口６１の端部に例えば切欠きを設けて形成してもよく、ポンプハウジング１２の端面２７に溝部を設けて形成してもよい。また、当該連通路は、キャン６０の切欠きとポンプハウジング１２の端面２７の溝部との両方によって形成される構成でもよい。 (2) In the above embodiment, an example in which the can 60 has the flange 62 is shown, but the can 60 may be configured without the flange 62. In this case, a communication path that connects the inner side of the can 60 and the outer side of the can 60 is formed between at least a part of the end portion of the opening 61 of the can 60 and the end surface 27 of the pump housing 12. The communication path may be formed by providing, for example, a notch at the end of the opening 61 of the can 60, or may be formed by providing a groove on the end surface 27 of the pump housing 12. Further, the communication path may be formed by both the notch of the can 60 and the groove portion of the end surface 27 of the pump housing 12.

（３）モータハウジング３２とポンプハウジング１２との間は、対向する端面４２，２７の一方または双方に溝部を形成することで、電動ポンプ１の外部と連通路とが連通する構成でもよい。この場合、間隙７２は不要となる。 (3) The motor housing 32 and the pump housing 12 may be configured such that a groove portion is formed in one or both of the opposed end faces 42 and 27 so that the outside of the electric pump 1 communicates with the communication path. In this case, the gap 72 is not necessary.

本発明は、キャンを備える電動ポンプに広く利用することができる。   The present invention can be widely used for an electric pump including a can.

１ ：電動ポンプ
１０ ：ポンプ部
１２ ：ポンプハウジング
１５ ：回転軸
２７ ：端面
２８ ：溝部
３０ ：モータ部
３２ ：モータハウジング
３３ ：ステータ
３４ ：ロータ
４２ ：端面
４３ ：溝部
６０ ：キャン
６１ ：開口
６２ ：フランジ
６５ ：シール部材
７０ ：連通間隙（連通路）
７１ ：連通路
Ｈ ：高さ
Ｔ ：幅 1: Electric pump 10: Pump part 12: Pump housing 15: Rotating shaft 27: End surface 28: Groove part 30: Motor part 32: Motor housing 33: Stator 34: Rotor 42: End face 43: Groove part 60: Can 61: Opening 62: Flange 65: Seal member 70: Communication gap (communication path)
71: Communication path H: Height T: Width

Claims (2)

モータハウジングと、前記モータハウジングに隣接するポンプハウジングと、
前記モータハウジングに収容され、回転軸によって軸支されるロータと、
前記ロータの径方向外側に配置され、前記モータハウジングに固定されるステータと、
前記ポンプハウジングに収容され、前記ロータの回転によって流体を吸入及び吐出するポンプ部と、
前記ロータと前記ステータとの間に設けられ、前記ポンプ部の流体が前記ステータに流入することを防止するカップ状のキャンと、を備え、
前記キャンと前記モータハウジングとの間にシール部材が配置されるとともに、
前記モータハウジングと前記ポンプハウジングとの間であって、前記シール部材よりも前記キャンの開口側に、前記キャンの内部側と前記キャンの外部側とを連通させる連通路が形成されている電動ポンプ。 A motor housing and a pump housing adjacent to the motor housing;
A rotor housed in the motor housing and supported by a rotating shaft;
A stator that is disposed radially outside the rotor and is fixed to the motor housing;
A pump unit housed in the pump housing and sucking and discharging fluid by rotation of the rotor;
A cup-shaped can that is provided between the rotor and the stator and prevents the fluid of the pump part from flowing into the stator;
A seal member is disposed between the can and the motor housing,
An electric pump between the motor housing and the pump housing, wherein a communication passage is formed on the opening side of the can from the seal member so as to communicate the inner side of the can and the outer side of the can . 前記キャンは、開口側の端部に、前記モータハウジングと前記ポンプハウジングとの間を径方向外側に向かって延出するフランジを有し、
前記シール部材は、弾性変形可能であって、前記モータハウジングと前記フランジとの間に配置され、
前記キャンの前記フランジは、前記モータハウジングと間に間隙を有する状態で前記シール部材に当接するように構成され、前記間隙が狭くなることにより前記連通路が形成される請求項１に記載の電動ポンプ。 The can has a flange extending radially outwardly between the motor housing and the pump housing at an opening end.
The seal member is elastically deformable and is disposed between the motor housing and the flange;
The electric motor according to claim 1, wherein the flange of the can is configured to contact the seal member with a gap between the motor housing and the communication path is formed by narrowing the gap. pump.
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