US20150354581A1 - Electric motor for a water pump - Google Patents

Electric motor for a water pump Download PDF

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Publication number
US20150354581A1
US20150354581A1 US14/729,428 US201514729428A US2015354581A1 US 20150354581 A1 US20150354581 A1 US 20150354581A1 US 201514729428 A US201514729428 A US 201514729428A US 2015354581 A1 US2015354581 A1 US 2015354581A1
Authority
US
United States
Prior art keywords
shaft
housing
electric pump
rotor
bearing
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.)
Abandoned
Application number
US14/729,428
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English (en)
Inventor
Thomas Gillespie
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.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
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 Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Priority to US14/729,428 priority Critical patent/US20150354581A1/en
Assigned to Schaeffler Technologies AG & Co. KG reassignment Schaeffler Technologies AG & Co. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GILLESPIE, THOMAS
Publication of US20150354581A1 publication Critical patent/US20150354581A1/en
Abandoned legal-status Critical Current

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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/049—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • 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
    • F04D13/0673—Units comprising pumps and their driving means the pump being electrically driven the motor being of the inside-out type
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/043—Shafts
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps 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
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
    • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type

Definitions

  • the present invention relates to an integrated electric motor/pump assembly, and in particular, an electric motor driven water pump for use in a cooling system in a vehicle.
  • the electric motor driven water pump includes a hydrodynamic bearing which does not provide an accurate axial location and has more friction than other types of bearings, i.e., rolling bearings.
  • most electric motors include an inner rotor mounted on a bearing supported shaft, that is surrounded by the stator. This either results in increased axial length for the water pump or may require the use of non-standard bearings, making the water pump more costly.
  • a further issue with most electric water pump motors is that they require non-standard mounting and/or packaging in the engine compartment for internal combustion engines. Mounting or replacing the electric motor bearings on the shaft in the known conventional electric water pumps is also time and labor consuming.
  • an electric pump assembly preferably for water or coolant
  • a housing and a housing sleeve adapted to receive a bearing assembly connected to the housing.
  • An integral shaft bearing assembly is mounted inside the housing sleeve.
  • the integral shaft bearing assembly includes a shaft, an outer bearing ring, and at least one bearing element, preferably in the form of a row of rolling elements, located between the shaft and the outer bearing ring.
  • An impeller is connected to the shaft and located in the pump chamber.
  • An electric motor is mounted to the housing, with the electric motor including a stator connected to an outside of the housing sleeve and a rotor mounted to the shaft on an opposite end from the impeller. The rotor is located opposite from and rotatable relative to the stator.
  • This arrangement allows for the use of an integral shaft bearing assembly which takes less space and has reduced tolerances than the prior known hydrodynamic bearings.
  • the integral shaft bearing assembly is used in connection with a mechanical seal located between the housing and the shaft so that the bearing is isolated from the cooling fluid or other fluid carried by the pump. This can result in longer bearing life and higher accuracy for the axial position of the shaft due to the use of a rolling bearing versus hydrodynamic bearing. Further, due to the use of the integral shaft bearing assembly, repair and replacement of the bearing is less time consuming and easier to achieve.
  • the housing also includes a pump chamber with an inlet, an outlet.
  • a pump chamber with an inlet, an outlet.
  • the rotor is cup-shaped and extends from the opposite end of the shaft about the housing sleeve so that the rotor is located outside of and rotates about the stator.
  • the stator includes a stator iron connected to the outside of the housing sleeve.
  • the integral shaft bearing assembly includes two rows of rolling elements located between the shaft and the outer bearing ring.
  • the rolling elements are preferably separated by cages.
  • plain bearings can be utilized with a separate axial stop.
  • bearing seals are located between the shaft and the outer bearing ring at each of the bearings to prevent ingress of debris into the bearings of the ISB.
  • the rotor may include an integrated cooling fan located in an axial end surface thereof.
  • permanent magnets are also connected to the rotor located in a cylindrical portion thereof that surrounds the stator.
  • FIG. 1 is a perspective view, partially in cross-section, of an electric water pump according to the invention.
  • FIG. 2 is a perspective, cross-sectional view similar to FIG. 1 of a second embodiment of an electric water pump according to the invention.
  • an electric pump assembly 10 preferably for water or coolant, according to the present invention is shown.
  • the electric pump assembly 10 integrates an electric motor 40 with the pump housing 12 to form a single electric pump unit 10 .
  • a preferred application is for an electric water or coolant pump for a motor vehicle, and the electric pump is also referred to as an electric water pump assembly herein, without being limiting.
  • the electric water pump assembly 10 includes the housing 12 , and can include a pump chamber 13 located therein with an inlet 14 and an outlet 16 , and a housing sleeve 32 adapted to receive a bearing assembly.
  • the housing 12 can just include the housing sleeve 32 and a cover portion adapted to close the volute chamber that receives the impeller that is formed on the mating component of the engine.
  • the sleeve 32 could optionally be formed as a separate component that is connected to the housing 12 .
  • the inlet and outlet can also be located on the mating component of the engine.
  • the housing 12 is preferably a cast or machined aluminum part and/or can be formed by a sintered material to a near net shape. Other materials can be utilized, for example cast iron or plastic.
  • the ISB 20 is mounted inside the housing sleeve 32 .
  • the ISB 20 includes a shaft 22 and outer bearing ring 30 and at least one bearing element, preferably in the form of at least one row of rolling elements 24 A, 24 B located between the shaft 22 and the outer bearing ring 30 .
  • preferably two bearing elements 24 A, 24 B are provided between the shaft 22 and the outer bearing ring 30 .
  • the bearing elements 24 A, 24 B are preferably rows of rolling elements, and more preferably ball bearings or rollers and include rolling elements separated by cages 26 A, 26 B, and the shaft 22 preferably includes grooves that act as inner races for the rolling elements.
  • FIG. 1 An integral shaft bearing assembly (ISB) 20 is mounted inside the housing sleeve 32 .
  • the ISB 20 includes a shaft 22 and outer bearing ring 30 and at least one bearing element, preferably in the form of at least one row of rolling elements 24 A, 24 B located between the shaft 22 and the outer bearing ring 30 .
  • bearing seals 28 A, 28 B are located between the shaft 22 and the outer bearing ring 30 in proximity to each of the bearings 24 A, 24 B.
  • the ISB 20 including the shaft 22 , outer bearing ring 30 , bearings 24 A, 24 B with cages 26 A, 26 B, and the bearing seals 28 A, 28 B, is preferably a pre-assembled unit and can be installed as a single part into the electric water pump assembly 10 .
  • the ISB 20 is pressed into the housing sleeve 32 .
  • a seal 34 is preferably located between the shaft 22 and the housing 12 .
  • the seal separates the bearing element(s) 24 A, 24 B from the pump chamber 13 and any fluid being carried by the pump.
  • the seal 34 can be a mechanical seal, a lip seal, or other suitable seal arrangement to prevent the ingress of coolant being handled by the pump. This is important to increase the life of the bearings.
  • an impeller 18 is connected to the shaft 22 and located in the pump chamber 13 .
  • the impeller 18 is preferably a centrifugal impeller which takes fluid from the inlet 14 and forces it radially outwardly in a given rotational direction such that the fluid exits the pump chamber 13 via the outlet 16 to be circulated, for example, in a cooling system of a vehicle, which could be an electric vehicle or a vehicle with an internal combustion engine. This can be used, for example, for cooling an electric motor in the electric vehicle or for cooling a battery compartment.
  • the electric motor 40 is mounted to the housing 12 .
  • the electric motor 40 includes a stator formed by a stator iron 42 as well as a stator coil 44 connected to an outside of the housing sleeve 32 .
  • a rotor 46 is mounted to the shaft 22 on an opposite end from the impeller 18 .
  • the rotor 46 is located outside of and rotatable about the stator parts 42 , 44 .
  • the rotor 46 is cup-shaped and includes an axial disc portion 47 as well as a cylindrical portion 49 that extends circumferentially about the stator parts 42 , 44 .
  • Rotor magnets 50 are preferably located on the cylindrical portion 49 of the rotor 46 .
  • FIG. 2 second embodiment of an electric pump assembly 10 ′ is shown.
  • the electric pump assembly 10 ′ is the same as the electric pump assembly 10 except that here optional cooling fan fins 48 have been punched into the axial disc portion 47 . This provides for cooing of the electric rotor 40 without the need for a separate fan since the fins 48 are stamped into the rotor 46 .
  • the stator 42 , 44 located outside of the housing 12 on the housing sleeve 32 is supplied with commutated power in order to rotate the rotor 46 in order to drive the shaft 22 to rotate the pump impeller 18 . Accordingly, a compact electric water pump 10 , 10 ′ is provided having fewer parts and a more compact arrangement, specifically in the axial direction, than prior known conventional electric water pumps.
US14/729,428 2014-06-05 2015-06-03 Electric motor for a water pump Abandoned US20150354581A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/729,428 US20150354581A1 (en) 2014-06-05 2015-06-03 Electric motor for a water pump

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201462008105P 2014-06-05 2014-06-05
US14/729,428 US20150354581A1 (en) 2014-06-05 2015-06-03 Electric motor for a water pump

Publications (1)

Publication Number Publication Date
US20150354581A1 true US20150354581A1 (en) 2015-12-10

Family

ID=54549064

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/729,428 Abandoned US20150354581A1 (en) 2014-06-05 2015-06-03 Electric motor for a water pump

Country Status (2)

Country Link
US (1) US20150354581A1 (de)
DE (1) DE102015210154A1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113482939A (zh) * 2021-08-13 2021-10-08 宁德时代电机科技有限公司 集成控制器高效水冷外转子式永磁智能水泵
TWI799190B (zh) * 2022-03-15 2023-04-11 大井泵浦工業股份有限公司 馬達模組及具有馬達模組的水冷式泵浦

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018125569A1 (de) * 2018-10-16 2020-04-16 Schaeffler Technologies AG & Co. KG Wälzlagerung und Wasserpumpe

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698542A (en) * 1980-05-10 1987-10-06 Papst-Motoren Gmbh & Co. K.G. Brushless direct current motor system
US4715780A (en) * 1984-09-10 1987-12-29 Nippon Seiko Kabushiki Kaisha Water pump
US5478222A (en) * 1991-04-10 1995-12-26 Heidelberg; Goetz Fluid pump having a pressure sealed motor chamber
US5783881A (en) * 1995-10-21 1998-07-21 Emb Elektrobau Mulfingen Gmbh & Co. Brushless electric motor with heat sink and mounting arrangement thereof
US6033456A (en) * 1998-02-06 2000-03-07 Texaco Inc. Integration of partial oxidation process and direct reduction reaction process
US6104112A (en) * 1999-08-19 2000-08-15 Vanjani; Chandu R. Brushless electric motor assembly
US6524083B2 (en) * 2000-04-25 2003-02-25 Aisan Kogyo Kabushiki Kaisha Magnetic coupling pump
US20030068240A1 (en) * 2001-10-09 2003-04-10 Hsieh Hsin Mao Cooling fan dust guard
US20080024023A1 (en) * 2006-07-28 2008-01-31 Delta Electronics, Inc. Fan for vehicle and its motor
US7804213B2 (en) * 2003-03-07 2010-09-28 Resmed Motor Technologies Inc. Low profile d.c. brushless motor for an impeller mechanism or the like
US8967981B2 (en) * 2010-01-11 2015-03-03 Pierburg Pump Technology Gmbh Mechanical combustion engine coolant pump

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4698542A (en) * 1980-05-10 1987-10-06 Papst-Motoren Gmbh & Co. K.G. Brushless direct current motor system
US4715780A (en) * 1984-09-10 1987-12-29 Nippon Seiko Kabushiki Kaisha Water pump
US5478222A (en) * 1991-04-10 1995-12-26 Heidelberg; Goetz Fluid pump having a pressure sealed motor chamber
US5783881A (en) * 1995-10-21 1998-07-21 Emb Elektrobau Mulfingen Gmbh & Co. Brushless electric motor with heat sink and mounting arrangement thereof
US6033456A (en) * 1998-02-06 2000-03-07 Texaco Inc. Integration of partial oxidation process and direct reduction reaction process
US6104112A (en) * 1999-08-19 2000-08-15 Vanjani; Chandu R. Brushless electric motor assembly
US6524083B2 (en) * 2000-04-25 2003-02-25 Aisan Kogyo Kabushiki Kaisha Magnetic coupling pump
US20030068240A1 (en) * 2001-10-09 2003-04-10 Hsieh Hsin Mao Cooling fan dust guard
US7804213B2 (en) * 2003-03-07 2010-09-28 Resmed Motor Technologies Inc. Low profile d.c. brushless motor for an impeller mechanism or the like
US20080024023A1 (en) * 2006-07-28 2008-01-31 Delta Electronics, Inc. Fan for vehicle and its motor
US8967981B2 (en) * 2010-01-11 2015-03-03 Pierburg Pump Technology Gmbh Mechanical combustion engine coolant pump

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113482939A (zh) * 2021-08-13 2021-10-08 宁德时代电机科技有限公司 集成控制器高效水冷外转子式永磁智能水泵
TWI799190B (zh) * 2022-03-15 2023-04-11 大井泵浦工業股份有限公司 馬達模組及具有馬達模組的水冷式泵浦

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Date Code Title Description
AS Assignment

Owner name: SCHAEFFLER TECHNOLOGIES AG & CO. KG, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GILLESPIE, THOMAS;REEL/FRAME:035777/0263

Effective date: 20150602

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION