US20150198165A1 - Electric fan - Google Patents

Electric fan Download PDF

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Publication number
US20150198165A1
US20150198165A1 US14593396 US201514593396A US20150198165A1 US 20150198165 A1 US20150198165 A1 US 20150198165A1 US 14593396 US14593396 US 14593396 US 201514593396 A US201514593396 A US 201514593396A US 20150198165 A1 US20150198165 A1 US 20150198165A1
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US
Grant status
Application
Patent type
Prior art keywords
electric
hub
motor
impeller
rotor
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
US14593396
Inventor
Giuliano Gabbin
Ermanno PROCOPIO
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.)
Johnson Electric SA
Original Assignee
Johnson Electric SA
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

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D25/00Pumping installations or systems
    • F04D25/02Units comprising pumps and their driving means
    • F04D25/06Units comprising pumps and their driving means the pump being electrically driven
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D19/00Axial-flow pumps
    • F04D19/002Axial flow fans
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/26Rotors specially for elastic fluids
    • F04D29/32Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329Details of the hub
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/668Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations

Abstract

An electric fan, for cooling a heat exchanger of a motor vehicle, has an electric motor including a rotor and a stator, and an axial impeller including a central hub from which a plurality of blades extends. The hub is connected to the rotor at a number of connecting points. At each connecting point, the hub of the impeller is connected to the rotor by means of a respective connecting device including a resilient vibration damper.

Description

    CROSS REFERENCE TO RELATED APPLICATIONS
  • [0001]
    This non-provisional patent application claims priority under 35 U.S.C. §119(a) from Utility Model Application No. TO 2014 U 000003 filed in Italy on Jan. 10, 2014, the entire contents of which are hereby incorporated by reference.
  • FIELD OF THE INVENTION
  • [0002]
    This invention relates to an electric fan and in particular, to a cooling fan for a heat exchanger of a motor vehicle.
  • BACKGROUND OF THE INVENTION
  • [0003]
    More specifically, the invention proposes an electric fan of the type comprising: an electric motor, including a rotor and a stator, and an axial impeller, including a central hub from which a plurality of blades extends, the huh being connected to the rotor of the motor at one or more connecting points or areas.
  • [0004]
    In operation, the electric motor of an electric fan of this type generates considerable vibration, which is transmitted to the impeller and causes the generation of acoustic noise which is rather annoying to the human ear, particularly at low speeds.
  • SUMMARY OF THE INVENTION
  • [0005]
    Hence there is a desire for an electric fan of this type, made in such a way as to overcome the aforementioned drawback of electric fans according to the prior art.
  • [0006]
    This is achieved by the present invention with an electric fan of the type specified above, in which, at each of the aforesaid one or more connecting points or areas, the impeller hub is connected to the rotor of the electric motor by means of a respective connecting device including a resilient vibration damper.
  • [0007]
    Accordingly, in one aspect thereof, the present invention provides an electric fan, for a heat exchanger of a motor vehicle, comprising: an electric motor including a rotor and a stator; and an axial impeller including a central huh from which a plurality of blades extends, the hub being connected to the rotor of said motor at one or more connecting points or areas, wherein at these one or more connecting points or areas, the hub of the impeller is connected to the rotor of the electric motor by means of a respective connecting device including a resilient vibration damper.
  • [0008]
    Preferably, the hub of the impeller has a substantially bowl-like shape, with an end wall connected to an annular lateral wall which is at least approximately cylindrical, and wherein the rotor of the electric motor has a crown which extends inside the hub of the impeller, near the end wall of said hub, to which it is connected by means of a plurality of said connecting devices including respective resilient vibration dampers.
  • [0009]
    Preferably, each of these one or more connecting devices comprises an annular damping member of resilient material, positioned in a through opening of the hub and penetrated by a fastening member for fastening the hub to the rotor of the motor.
  • [0010]
    Preferably, the resilient material is an elastomeric material.
  • [0011]
    Preferably, a tubular element of essentially rigid material, is interposed between each damping member and the corresponding fastening member.
  • [0012]
    Preferably, the tubular element is of a metallic material.
  • [0013]
    Preferably, the fastening member is a screw or bolt having an end head, and said rigid tubular element has at one end a flange-like formation interposed between the head of the corresponding screw or bolt and said damping member.
  • [0014]
    Preferably, the or each resilient vibration damper is in the form of a cylindrical ring, and has an outer peripheral groove that engages with an edge of said through opening of the hub of the impeller.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • [0015]
    A preferred embodiment of the invention will now be described, by way of example only, with reference to figures of the accompanying drawings. In the figures, identical structures, elements or parts that appear in more than one figure are generally labeled with a same reference numeral in all the figures in which they appear. Dimensions of components and features shown in the figures are generally chosen for convenience and clarity of presentation and are not necessarily shown to scale. The figures are listed below.
  • [0016]
    FIG. 1 is a perspective front elevation view of an electric cooling fan according to the invention;
  • [0017]
    FIG. 2 is a partial, perspective view, on an enlarged scale, which shows, in particular, the hub of the impeller of FIG. 1; and
  • [0018]
    FIG. 3 is a partial sectional view taken along line III-III of FIG. 2.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • [0019]
    In the drawings, an electric fan according to the present invention is indicated as a whole by 1. The electric fan 1 comprises, in a known way, a substantially plate-like supporting structure or cowl 2, having a main circular opening 3 in which an impeller, indicated as a whole by 4, is rotatably mounted. The impeller 4 is connected to the rotor 8 of an electric motor which is not visible in FIGS. 1 and 2, but is partially illustrated in FIG. 3, where it is indicated as a whole by 5.
  • [0020]
    The electric motor 5 comprises a stator 6, fastened in a known way to the supporting structure or cowl 2, for example by means of a plurality of spokes 7 as shown in FIG. 1. The electric motor 5 also comprises a rotor 8, including an axial end surface or crown.
  • [0021]
    The impeller 4 comprises a central hub 9 from which a plurality of curved blades 10 extends, the outermost ends of which are joined to a peripheral ring 11 (FIG. 1). The hub 9 of the impeller 4 is connected to the rotor 8 of the electric motor 5 at one or more connecting points or areas.
  • [0022]
    In the embodiment illustrated by way of example in the drawings, the hub 9 is connected to the crown of the rotor 8 of the motor 5 at three connecting points or areas, indicated by 12, located at the same distance d from the axis X-X of the impeller (FIG. 3).
  • [0023]
    In the illustrated embodiment, the hub 9 of the impeller 4 has a substantially bowl-like shape, with an end wall 9 a connected to an annular lateral wall 9 b which is at least approximately cylindrical. The crown of the rotor 8 of the electric motor 5 extends inside the hub 9, near the end wall 9 a of the latter, to which it is connected at the aforesaid three connecting points or areas 12 by means of devices 13 including respective resilient vibration dampers, which are described more fully below.
  • [0024]
    With particular reference to FIG. 3, each connecting device 13 comprises an annular damping member 14 made of resilient material, preferably an elastomeric material (vulcanized rubber). The damping member 13 is positioned in a through opening 9 c of the end wall 9 a of the hub 9 of the impeller. The damping member 14 essentially takes the form of a cylindrical ring, and in its axially intermediate part it has an outer peripheral groove 14 a in which the edge of the through opening 9 c of the hub 9 of the impeller 4 is engaged.
  • [0025]
    The damping member 14 is penetrated by a corresponding member 15 for fastening the impeller to the rotor crown 8 of the electric driving motor 5. The fastening member 15 is, for example, a screw or a bolt, having an end head 15 a. Between the annular damping member 14 and the screw or bolt 15 there is interposed a tubular element 16 of essentially rigid material, for example a metallic material. The rigid tubular element 16 conveniently has a flange-like end formation 16 a, interposed between the head 15 a of the screw or bolt 15 and the adjacent end of the annular damping member 14.
  • [0026]
    The threaded shank of the screw or bolt 15 engages in a correspondingly threaded opening in the crown of the rotor 8.
  • [0027]
    Tests conducted by the applicant have demonstrated that the use of the solution according to the present invention provides a noticeable reduction, of the order of 10 dBA or more, in the acoustic noise generated, particularly in the range from about 100 Hz to 1 kHz.
  • [0028]
    In the description and claims of the present application, each of the verbs “comprise”, “include”, “contain” and “have”, and variations thereof, are used in an inclusive sense, to specify the presence of the stated item or feature but do not preclude the presence of additional items or features.
  • [0029]
    It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination.
  • [0030]
    The embodiments described above are provided by way of example only, and various other modifications will be apparent to persons skilled in the field without departing from the scope of the invention as defined by the appended claims.

Claims (8)

  1. 1. Electric fan, for a heat exchanger of a motor vehicle, comprising:
    an electric motor including a rotor and a stator; and
    an axial impeller including a central hub from which a plurality of blades extends, the hub being connected to the rotor of said motor at one or more connecting points or areas,
    wherein at these one or more connecting points or areas, the hub of the impeller is connected to the rotor of the electric motor by means of a respective connecting device including a resilient vibration damper.
  2. 2. The electric fan of claim 1, wherein the hub of the impeller has a substantially bowl-like shape, with an end wall connected to an annular lateral wall which is at least approximately cylindrical, and wherein the rotor of the electric motor has a crown which extends inside the hub of the impeller, near the end wall of said hub, to which it is connected by means of a plurality of said connecting devices including respective resilient vibration dampers.
  3. 3. The electric fan of claim 1, wherein each of these one or more connecting devices comprises an annular damping member of resilient material, positioned in a through opening of the hub and penetrated by a fastening member for fastening the hub to the rotor of the motor.
  4. 4. The electric fan of claim 3, wherein each damping member is of elastomeric material.
  5. 5. The electric fan of claim 3, wherein a tubular element of essentially rigid material, is interposed between the damping member and the corresponding fastening member.
  6. 6. The electric fan of claim 5, wherein the tubular element is of a metallic material.
  7. 7. The electric fan of claim 5, wherein said fastening member is a screw or bolt having an end head, and said rigid tubular element has at one end a flange-like formation interposed between the head of the corresponding screw or bolt and said damping member.
  8. 8. The electric fan of claim 3, wherein the or each resilient vibration damper is in the form of a cylindrical ring, and has an outer peripheral groove that engages with an edge of said through opening of the hub of the impeller.
US14593396 2014-01-10 2015-01-09 Electric fan Pending US20150198165A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ITTO20140003 2014-01-10
ITTO2014U000003 2014-01-10

Publications (1)

Publication Number Publication Date
US20150198165A1 true true US20150198165A1 (en) 2015-07-16

Family

ID=53485090

Family Applications (1)

Application Number Title Priority Date Filing Date
US14593396 Pending US20150198165A1 (en) 2014-01-10 2015-01-09 Electric fan

Country Status (4)

Country Link
US (1) US20150198165A1 (en)
JP (1) JP2015132262A (en)
CN (1) CN104776064A (en)
DE (1) DE102015100130A1 (en)

Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987242A (en) * 1957-10-29 1961-06-06 Gen Electric Resilient fan guard support
US3756551A (en) * 1971-10-27 1973-09-04 Lord Corp Anti-vibration support
US3757914A (en) * 1970-11-21 1973-09-11 Dynair Ltd Fan drives
US4321011A (en) * 1978-11-23 1982-03-23 Aisin Seiki Kabushiki Kaisha Fan assembly
US4917573A (en) * 1989-05-31 1990-04-17 Deere & Company Cooling fan isolation mount
US5397206A (en) * 1994-03-15 1995-03-14 Chrysler Corporation Vibration isolating fastener
US5464323A (en) * 1994-03-02 1995-11-07 Hunter Fan Company Vibration isolation system for fan blade
US6328293B1 (en) * 1998-09-18 2001-12-11 Lord Corporation Multi-linkage suspension system including outboard isolators
US6328513B1 (en) * 1999-05-19 2001-12-11 Nichias Corporation Vibration floating washer assembly and method of attaching the same to heat insulating plate
US6384494B1 (en) * 1999-05-07 2002-05-07 Gate S.P.A. Motor-driven fan, particularly for a motor vehicle heat exchanger
US20030038548A1 (en) * 2001-08-20 2003-02-27 Sylvain Nadeau Double stage engine cooling module suspension
US6908284B2 (en) * 2001-10-30 2005-06-21 Robert Bosch Gmbh Fan attachment with dynamic out-of-balance equalization
US20050271527A1 (en) * 2003-10-29 2005-12-08 Yung Chen Electrical insulation arrangements for electric fans, motor assemblies and controls therefor
US7786629B2 (en) * 2005-03-09 2010-08-31 Mitsuba Corporation Electric motor mounting structure
US8727732B2 (en) * 2009-11-18 2014-05-20 Hunter Fan Company Fan blade mounting system
US8814519B2 (en) * 2008-11-03 2014-08-26 Robert Bosch Gmbh Fan, method for assembling a fan wheel and device
US9039377B2 (en) * 2010-08-09 2015-05-26 Lowe's Companies, Inc. Fan assemblies and methods for assembling same
US9182008B2 (en) * 2009-05-13 2015-11-10 Robert Bosch Gmbh Adjustment device for a rotating body and rotating body
US9291190B2 (en) * 2010-09-06 2016-03-22 Facc Ag Fixing device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1555429A (en) * 1976-11-15 1979-11-07 Caterpillar Tractor Co Mouting grommet
DE102011016204A1 (en) * 2011-04-06 2012-10-11 Man Truck & Bus Ag Drive system of the engine cooling for motor vehicles

Patent Citations (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2987242A (en) * 1957-10-29 1961-06-06 Gen Electric Resilient fan guard support
US3757914A (en) * 1970-11-21 1973-09-11 Dynair Ltd Fan drives
US3756551A (en) * 1971-10-27 1973-09-04 Lord Corp Anti-vibration support
US4321011A (en) * 1978-11-23 1982-03-23 Aisin Seiki Kabushiki Kaisha Fan assembly
US4917573A (en) * 1989-05-31 1990-04-17 Deere & Company Cooling fan isolation mount
US5464323A (en) * 1994-03-02 1995-11-07 Hunter Fan Company Vibration isolation system for fan blade
US5397206A (en) * 1994-03-15 1995-03-14 Chrysler Corporation Vibration isolating fastener
US6328293B1 (en) * 1998-09-18 2001-12-11 Lord Corporation Multi-linkage suspension system including outboard isolators
US6384494B1 (en) * 1999-05-07 2002-05-07 Gate S.P.A. Motor-driven fan, particularly for a motor vehicle heat exchanger
US6328513B1 (en) * 1999-05-19 2001-12-11 Nichias Corporation Vibration floating washer assembly and method of attaching the same to heat insulating plate
US20030038548A1 (en) * 2001-08-20 2003-02-27 Sylvain Nadeau Double stage engine cooling module suspension
US6908284B2 (en) * 2001-10-30 2005-06-21 Robert Bosch Gmbh Fan attachment with dynamic out-of-balance equalization
US20050271527A1 (en) * 2003-10-29 2005-12-08 Yung Chen Electrical insulation arrangements for electric fans, motor assemblies and controls therefor
US7786629B2 (en) * 2005-03-09 2010-08-31 Mitsuba Corporation Electric motor mounting structure
US8814519B2 (en) * 2008-11-03 2014-08-26 Robert Bosch Gmbh Fan, method for assembling a fan wheel and device
US9182008B2 (en) * 2009-05-13 2015-11-10 Robert Bosch Gmbh Adjustment device for a rotating body and rotating body
US8727732B2 (en) * 2009-11-18 2014-05-20 Hunter Fan Company Fan blade mounting system
US9039377B2 (en) * 2010-08-09 2015-05-26 Lowe's Companies, Inc. Fan assemblies and methods for assembling same
US9291190B2 (en) * 2010-09-06 2016-03-22 Facc Ag Fixing device

Also Published As

Publication number Publication date Type
JP2015132262A (en) 2015-07-23 application
CN104776064A (en) 2015-07-15 application
DE102015100130A1 (en) 2015-07-16 application

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Date Code Title Description
AS Assignment

Owner name: JOHNSON ELECTRIC S.A., SWITZERLAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:GABBIN, GIULIANO;PROCOPIO, ERMANNO;REEL/FRAME:034735/0973

Effective date: 20141204