EP2930368B1 - Water pump - Google Patents

Water pump Download PDF

Info

Publication number
EP2930368B1
EP2930368B1 EP13860855.9A EP13860855A EP2930368B1 EP 2930368 B1 EP2930368 B1 EP 2930368B1 EP 13860855 A EP13860855 A EP 13860855A EP 2930368 B1 EP2930368 B1 EP 2930368B1
Authority
EP
European Patent Office
Prior art keywords
storage space
yoke
liquid storage
housing
clutch
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.)
Not-in-force
Application number
EP13860855.9A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2930368A1 (en
EP2930368A4 (en
Inventor
Junichiro Sakurai
Yosuke Suzuki
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
Publication of EP2930368A1 publication Critical patent/EP2930368A1/en
Publication of EP2930368A4 publication Critical patent/EP2930368A4/en
Application granted granted Critical
Publication of EP2930368B1 publication Critical patent/EP2930368B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • 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
    • F04D29/10—Shaft sealings
    • F04D29/106—Shaft 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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5893—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps heat insulation or conduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2260/00—Function
    • F05D2260/60—Fluid transfer
    • F05D2260/602—Drainage
    • F05D2260/6022—Drainage of leakage having past a seal

Definitions

  • This invention relates to a water pump which includes a driving rotary body being drivingly rotated by a drive mechanism, a pump shaft rotating by a power transmission from the driving rotary body, a housing being inserted with the pump shaft, an impeller being fixed at one end side of the pump shaft, an electromagnetic clutch including a clutch portion being disposed at the other end side of the pump shaft, the clutch portion switching on and off the power transmission from the driving rotary body to the pump shaft, a mechanical seal being disposed at a position between the impeller and the clutch portion, the mechanical seal being mounted between the pump shaft and the housing, and a liquid storage space allowing to store a liquid leaking out from a side of the impeller to a side of the clutch portion via the mechanical seal.
  • the electromagnetic clutch includes a yoke holding an electromagnetic coil and the liquid storage space is formed at the housing.
  • a mechanical seal mounted between a pump shaft and a housing prevents a liquid from leaking out while allowing a seal member fixed at a side of the pump shaft and a seal member fixed at a side of the housing to relatively slide with each other. Thus, the liquid cannot be prevented from leaking out from a side of an impeller to a side of a clutch portion through a gap between the seal members.
  • a water pump in which a liquid storage space which is able to store such a liquid is formed at the housing is disclosed.
  • the housing is formed with an opening portion opening the liquid storage space to a side of a yoke and is provided with a cap which closes the opening portion.
  • the cap is formed with a drain hole which is able to drain the liquid stored in the liquid storage space outside the housing.
  • the water pump is configured such that the heat of the yoke heated by a heat generated by the energization to the electromagnetic coil is conducted to the housing via a fixing bracket fixing the yoke to the housing to heat the liquid storage space and the heat of the yoke vaporizes the liquid stored in the liquid storage space. Accordingly, the liquid and the vapor stored in the liquid storage space can be drained outside the housing via the drain hole formed at the cap.
  • WO 2010/058233 A1 discloses a water pump including a housing, a pumping mechanism and a pulley that receives an input torque.
  • Patent Document 1 JP2010-242623A
  • the heat of the yoke that is heated by generation of heat of the electromagnetic coil is conducted to the housing via the fixing bracket, the heat of the yoke is easily radiated outside the fixing bracket before heating the liquid storage space sufficiently.
  • the liquid storage space cannot be easily and sufficiently heated.
  • an amount of the liquid which can be vaporized at the liquid storage space is reduced, the liquid stored in the liquid storage space is increased early and is easily drained outside from the drain hole.
  • a trouble of unexpected leak of the liquid from the pump occurs.
  • the present invention is made in light of the above-described circumstance and a purpose of the present invention is to provide a water pump that does not easily drain a liquid stored in a liquid storage space outside.
  • the yoke is in contact with the housing. Accordingly, the heat held at the yoke that is heated by a heat generated by the energization to the electromagnetic coil is effectively conducted to the housing without involving a member intervening between the yoke and the housing.
  • the temperature of the liquid storage space is easily increased and because an amount of the liquid which can be vaporized at the liquid storage space is increased, the early increase of the liquid stored in the liquid storage space is prevented. Accordingly, the liquid stored in the liquid storage space is not easily drained outside.
  • Fig. 1 shows a water pump P for circulating cooling water, the water pump P mounted to an engine E (an example of a drive mechanism) for a vehicle according to this invention.
  • the water pump P includes a drive pulley (an example of a driving rotary body) 1, a pump shaft 2, a pump housing 3, an impeller 4, an electromagnetic clutch 5, a mechanical seal 6 and a liquid storage space 7.
  • the drive pulley 1 is drivingly rotated by the engine E.
  • the pump shaft 2 rotates by a power transmission from the drive pulley 1.
  • the pump housing 3 is inserted with the pump shaft 2.
  • the impeller 4 is fixed at one end side of the pump shaft 2.
  • the electromagnetic clutch 5 includes a clutch portion 5a being disposed at the other end side of the pump shaft 2, the clutch portion 5a switching on and off the power transmission from the drive pulley 1 to the pump shaft 2.
  • the mechanical seal 6 is disposed at a position between the impeller 4 and the clutch portion 5a, and is mounted between the pump shaft 2 and the pump housing 3.
  • the liquid storage space 7 allows to store a liquid leaking out from a side of the impeller 4 to a side of the clutch portion 5a via the mechanical seal 6.
  • the pump housing 3 is integrally formed with a fixed flange portion 8 and a cylindrical shaft portion 9 which are made from a metal material, for example, aluminum alloy.
  • the fixed flange portion 8 is fixed to an engine E.
  • the cylindrical shaft portion 9 is formed in a cylindrical shape and the pump shaft 2 is inserted in the cylindrical shaft portion.
  • the fixed flange portion 8 is formed with a circular shaft through hole 8a which is centered on a rotary axis X.
  • the cylindrical shaft portion 9 is coaxial with the rotary axis X so as to be communicated with the shaft through hole 8a and is integrally formed with the fixed flange portion 8.
  • the cylindrical shaft portion 9 is integrally provided with a large diameter cylindrical shaft portion 9a which is continuously provided with the fixed flange portion 8 and a small diameter cylindrical shaft portion 9b which is continuously provided with the large diameter cylindrical shaft portion 9a.
  • the inner diameter of the large diameter cylindrical shaft portion 9a is formed to include the same diameter as the diameter of the shaft through hole 8a.
  • the inner diameter of the small diameter cylindrical shaft portion 9b is formed to include the diameter smaller than the diameter of the shaft through hole 8a.
  • the pump shaft 2 is inserted to be positioned inside the shaft through hole 8a and the cylindrical shaft portion 9 and is rotatably supported at an inner circumferential side of the small diameter cylindrical shaft portion 9b about the rotary axis X via a pump bearing 10.
  • the mechanical seal 6 is mounted between an outer circumferential portion of the pump shaft 2 and an inner circumferential portion of the shaft through hole 8a.
  • the drive pulley 1 is rotatably supported at an outer circumferential side of the small diameter cylindrical shaft portion 9b about the rotary axis X via a pulley bearing 11.
  • the pump shaft 2 and the drive pulley 1 are relatively rotatably supported about the rotary axis X.
  • the drive pulley 1 is made from a magnetic body material, for example, an iron material or a nickel alloy material, and is integrally provided with a cylindrical outer circumferential wall 1a, a cylindrical inner circumferential wall 1b and a side end wall 1c.
  • the outer circumferential wall 1a is centered on the rotary axis X.
  • the inner circumferential wall 1b is disposed at an inner side of the outer circumferential wall 1a and is centered on the rotary axis X.
  • the side end wall 1c connects each end portion of the outer circumferential wall 1a and the inner circumferential wall 1b, the end portions which are disposed opposite to a side of the impeller 4.
  • the side end wall 1c is disposed in an orientation orthogonal to the rotary axis X.
  • the drive pulley 1 is formed with an annular space 12 which is surrounded by the outer circumferential wall 1a, the inner circumferential wall 1b and the side end wall 1c, and which opens to the side of the impeller 4.
  • An electromagnetic solenoid 13 of the electromagnetic clutch 5 is positioned inside the annular space 12.
  • a belt wound portion 14a wound with a drive belt 14 is formed at an outer circumferential surface of the outer circumferential wall 1a.
  • the pulley bearing 11 is disposed such that an outer race is in contact with an inner circumferential surface of the inner circumferential wall 1b.
  • a clutch surface 16 attracting an armature (a clutch plate) 15 is formed at an outer surface side of the side end wall 1c, the outer surface side which is disposed in a direction opposite to a side of the electromagnetic solenoid 13.
  • the side end wall 1c is formed with plural through holes 16a which is long in a circumferential direction and which penetrates the clutch surface 16.
  • the through holes 16a are disposed apart from one another at an interval in the circumferential direction.
  • the drive belt 14 is hung and wound around an output pulley provided at the crankshaft of the engine E and the drive pulley 1 and drivingly rotates the drive pulley 1 continuously when starting up the engine E.
  • the switching of the power transmission operated by the electromagnetic clutch 5 is controlled on the basis of detection results of a temperature sensor (not shown in the drawings) detecting, for example, the water temperature of cooling water.
  • the electromagnetic clutch 5 is maintained off state (disconnected state) to facilitate the warm up.
  • the electromagnetic clutch 5 is switched to an on state (connected state) to circulate cooling water by the drive rotation of the impeller 4.
  • the electromagnetic clutch 5 is configured with the electromagnetic solenoid 13 which is housed in the annular space 12 of the drive pulley 1, and a clutch unit 17 which integrally rotates with the pump shaft 2.
  • a magnetic circuit which applies the magnetic flux transmitted from the electromagnetic solenoid 13 on the armature 15 is formed on the drive pulley 1.
  • the electromagnetic solenoid 13 includes a solenoid portion 18 which generates the magnetic flux by energization, and a yoke 19 which is made from a magnetic body material, for example, an iron material or a nickel alloy material to transmit the magnetic flux transmitted from the solenoid portion 18 to the drive pulley 1.
  • a solenoid portion 18 which generates the magnetic flux by energization
  • a yoke 19 which is made from a magnetic body material, for example, an iron material or a nickel alloy material to transmit the magnetic flux transmitted from the solenoid portion 18 to the drive pulley 1.
  • the yoke 19 is integrally formed with an inner cylindrical portion 19a, an outer cylindrical portion 19b and an annular connection plate portion 19c to be formed in an annular shape including the C-shape cross section.
  • the inner cylindrical portion 19a and the outer cylindrical portion 19b are formed in a cylindrical shape and are coaxially disposed with the rotary axis X.
  • the connection plate portion 19c connects each end portion of the inner cylindrical portion 19a and the outer cylindrical portion 19b, the end portions disposed at the side of the impeller 4.
  • the inner cylindrical portion 19a is disposed close to the inner circumferential wall 1b, and the outer cylindrical portion 19b is disposed close to the outer circumferential wall 1a, and the connection plate portion 19c is disposed in the orientation orthogonal to the rotary axis X.
  • the electromagnetic clutch 5 includes the yoke 19 which holds the electromagnetic coil 18b inside the yoke 19.
  • the clutch unit 17 includes a bush 20 which is fitted onto an end portion of the pump shaft 2, and plural spring plates 21 which bias the annular armature 15 to be away from the side end wall 1c of the drive pulley 1 while supporting the armature 15 to the bush 20.
  • the armature 15 is made from a magnetic body, for example, an iron material or a nickel alloy material.
  • a plate material which can be elastically deformed as spring steel is used for the spring plates 21, and one end is connected to a flange portion of the bush 20 and the other end is connected to the armature 15.
  • the electromagnetic solenoid 13 When the electromagnetic solenoid 13 is energized, a part of the magnetic flux formed at the magnetic circuit which is configured by the yoke 19 and the drive pulley 1 leaks outward via the through hole 16a of the side end wall 1c and affects the armature 15.
  • the armature 15 is attracted to the clutch surface 16 and the electromagnetic clutch 5 is switched to be in the on state. Accordingly, the clutch unit 17 configures the clutch portion 5a which switches on and off the power transmission from the drive pulley 1 to the pump shaft 2.
  • the fixed flange portion 8 configuring the pump housing 3 is integrally provided with a cylindrical wall portion 22 which is coaxial with the rotary axis X, and the cylindrical wall portion 22 is fixed to the yoke 19.
  • the liquid storage space 7 is formed annularly and is disposed between the cylindrical wall portion 22 and the large diameter cylindrical shaft portion 9a.
  • An opening portion 23 opening the liquid storage space 7 to the side of the yoke 19 is formed between respective end portions of the cylindrical wall portion 22 and the large diameter cylindrical shaft portion 9a.
  • the connection plate portion 19c is directly in contact with the cylindrical wall portion 22 and is positioned so as to close an outer circumferential side portion of the opening portion 23 of the liquid storage space 7.
  • an inflow hole 24 which flows, for example, cooling water leaking out from the mechanical seal 6 to a side of the pump bearing 10 to the liquid storage space 7 by its own weight is formed through in a cylindrical diameter direction.
  • each of drain holes 26 which can drain, for example, cooling water vaporized in the liquid storage space 7 outside is formed through at an upper portion and a side portion of the cylindrical wall portion 22.
  • the drain hole 26 may be single or plural, and can drain water vapor of cooling water (liquid) W stored in the liquid storage space 7 to an upper side of the pump housing 3.
  • the heat held at the yoke 19 that is heated by the heat generated by the energization to the electromagnetic coil 18b can be effectively conducted to the liquid storage space 7 via the connection plate portion 19c and the cylindrical wall portion 22, the evaporation of cooling water stored in the liquid storage space 7 can be facilitated.
  • a plate-shaped cap 25 which is made of resin or metal and which closes the entire circumference and the entire area of the opening portion 23 of the liquid storage space 7 is mounted so as be in contact with a plate surface of the connection plate portion 19c.
  • the yoke 19 can be exposed to the liquid storage space 7 by including the cap 25 which closes only a gap between the yoke 19 and the cylindrical shaft portion 9 or by not being mounted with the cap 25.
  • Fig. 3 shows another embodiment of a water pump P according to this invention.
  • a lower side portion of the liquid storage space 7 is defined by a bottom surface 27 which becomes lower as being closer to the side of the yoke 19. That is, the inclination bottom surface 27 which becomes lower as being closer to the side of the yoke 19 is formed at a portion of a lower end side, in a vertical direction, of the inner circumferential surface of the cylindrical wall portion 22.
  • cooling water flowing into the liquid storage space 7 is flown to be close to the side of the yoke 19 by its own weight and the evaporation of cooling water can be facilitated.
  • Other construction is identical to the first embodiment.
  • a surface of the yoke 19 which exposes to and faces the liquid storage space 7 can be provided with a projecting and recessed portion by being formed with, for example, a projecting and recessed surface or a rough surface at the surface of the yoke 19, or, by being projectingly fixed with, for example, a metal fin, which are not shown in the drawings.
  • the heat radiation area from the yoke 19 to the liquid storage space 7 may be further increased to enhance the evaporation effect of cooling water.
  • the water pump of this invention can be applied to various types of water pumps which include electromagnetic clutches.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP13860855.9A 2012-12-04 2013-11-21 Water pump Not-in-force EP2930368B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012265496A JP6107092B2 (ja) 2012-12-04 2012-12-04 ウオータポンプ
PCT/JP2013/081348 WO2014087845A1 (ja) 2012-12-04 2013-11-21 ウオータポンプ

Publications (3)

Publication Number Publication Date
EP2930368A1 EP2930368A1 (en) 2015-10-14
EP2930368A4 EP2930368A4 (en) 2015-12-23
EP2930368B1 true EP2930368B1 (en) 2019-04-03

Family

ID=50883269

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13860855.9A Not-in-force EP2930368B1 (en) 2012-12-04 2013-11-21 Water pump

Country Status (3)

Country Link
EP (1) EP2930368B1 (ja)
JP (1) JP6107092B2 (ja)
WO (1) WO2014087845A1 (ja)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11988218B2 (en) 2021-03-10 2024-05-21 Multi Parts Supply Usa, Inc. Electric coolant pump with expansion compensating seal

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6678002B2 (ja) 2015-10-20 2020-04-08 株式会社Tbk 流体ポンプ
CN108104937A (zh) * 2017-11-30 2018-06-01 无锡惠山泵业有限公司 一种离合器变量水泵
KR102188166B1 (ko) * 2019-09-30 2020-12-07 현대자동차주식회사 워터펌프-쿨링팬 조립체 및 그의 제어방법

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JP2862695B2 (ja) * 1991-02-14 1999-03-03 富士通株式会社 回路モジュールの実装構造
JPH0635870U (ja) * 1992-10-20 1994-05-13 大阪瓦斯株式会社 ガスエンジンヒートポンプ
JP3383888B2 (ja) * 1994-05-17 2003-03-10 愛知機械工業株式会社 ウォータポンプ構造
JPH10165297A (ja) * 1996-12-11 1998-06-23 Showa Alum Corp 電磁調理用器物及びその製造方法
JP2001044347A (ja) * 1999-07-28 2001-02-16 Furukawa Electric Co Ltd:The ヒートシンクおよびその製作方法
JP4013713B2 (ja) * 2002-09-18 2007-11-28 アイシン精機株式会社 ウォータポンプ
JP2005251861A (ja) * 2004-03-02 2005-09-15 Denso Corp 車両用電子制御装置およびその組付方法
JP5011968B2 (ja) * 2006-11-10 2012-08-29 アイシン精機株式会社 ウォータポンプ
JP4693850B2 (ja) * 2007-02-23 2011-06-01 シャープ株式会社 壁材
WO2010058233A1 (en) * 2008-11-18 2010-05-27 Wop Industria E Comércio De Bombas Ltda. Pump having an electromagnetic clutch system
JP2010242623A (ja) * 2009-04-07 2010-10-28 Hitachi Automotive Systems Ltd ウォータポンプ
JP2011075140A (ja) * 2009-09-29 2011-04-14 Noritz Corp ドレン水排出抑制機能を備えた空調装置およびこれを備えたレンジフード

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11988218B2 (en) 2021-03-10 2024-05-21 Multi Parts Supply Usa, Inc. Electric coolant pump with expansion compensating seal

Also Published As

Publication number Publication date
JP2014109261A (ja) 2014-06-12
EP2930368A1 (en) 2015-10-14
JP6107092B2 (ja) 2017-04-05
WO2014087845A1 (ja) 2014-06-12
EP2930368A4 (en) 2015-12-23

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