US3822103A - Flexible fan - Google Patents

Flexible fan Download PDF

Info

Publication number
US3822103A
US3822103A US00318421A US31842172A US3822103A US 3822103 A US3822103 A US 3822103A US 00318421 A US00318421 A US 00318421A US 31842172 A US31842172 A US 31842172A US 3822103 A US3822103 A US 3822103A
Authority
US
United States
Prior art keywords
fan
edge portion
leading edge
flexible
blade
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.)
Expired - Lifetime
Application number
US00318421A
Inventor
T Hori
M Hayashi
M Yoshida
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
Application granted granted Critical
Publication of US3822103A publication Critical patent/US3822103A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/382—Flexible blades
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/384—Blades characterised by form
    • 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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction

Definitions

  • the invention relates to a flexible fan/comprising, a boss portion and a plurality of fan blades radially extended from the boss portion and integrally formed therewith, the boss portion and the fan blades being of one piece construction and made of synthetic resin material, the'flexible fan being characterized in that, a
  • FIG.1 ' sum 1 or 3 FIG.1
  • FIG. 5 is a distributive view of pressure operating the blades, when blades are flooded;
  • FIG. 6 is a view showingthe deformed condition of blades when the blades are flooded; and t I FIG. 7 is a view similar to that of FIG; 2, illustrating,
  • the reference numeral 10 designates a fan boss and a plurality of blades 11 are radially extended'from an outerperipheral portion 12 of the fan boss 10.
  • the fan boss 10 and the blades 11 are integrally formed and made of such as synthetic resin.
  • the reference numeral 13 is a pilot hole for connecting with a pulley seat, not shown,and a plurality of bolt holes 14 is provided on the fanboss 10.
  • the ventilation isgenerally ventilated almost parallel. to a rotational axle, not shown, Accordingto FIG. 2, the incidence angle against a rotational direction 15 of a warpedline 16 of the blades 11 in a leading edge portion 18 is" zero or a little negative angle-is applied to the leading edge portion l8.
  • the reference numeral 18a shows a leadingedge portion of a conventional blade, and assuming that an angle against a wing chord 17a of the leading edge portion 18a against the extension of the warped line 16 is [32, an angle a of inclination of the wingichord 17a againstthe rotational direction 15, is larger than the angle'fi of the leading-edge portion 18a and the leading edge portion 18a is spread from the rotational direction 15 in the upper direction (toward the radiator, not shown).
  • a groove'20 is provided on the middle portion of the blade 11 soas to easily bend a trailingedge portion 19 of the blade 11 when the hydraulic pressure orwind pressure is operated to the blade-'11 as shown in .FIGSJI and 2.
  • An arc-shaped groove or a thin face 21 may be formed on the trailing edge portion 19 of the blade in order to specially bend ing detailed description when considered in connection with the accompanying drawings, wherein like reference characters designate like or corresponding parts throughout the several views and wherein:
  • FIG. 1 is a front view of the fan assembly of this inve'ntion,. but partially illustrated;
  • FIG.' 2 is a sectional view taken along the line II'-II of FIG. 1;
  • the groove 20 can be on a surface 22 or the inside surface 23, or on both the sur- 1 face 22 and the surface 23 as shownin FIG. 3.
  • the ventilation speed of the surface 22 is swifter than I when on the inside 23 in the operating state, namely, Reynolds number ishigh and the fan efficiency is re-' I Jerusalem, therefore it is desirable to provide the groove 20 I on the inside 23. It is not necessary to provide the in this invention as viewed in FIG. 7.
  • the impact force at this moment and the increasing pressure force on the inside 23 of the blade 11 are very large and the positive pressure is normally applied to the inside 23 of the leading edge portion .18 as shown in FIG. 5, but the negative pressure is supplied thereto in this invention.
  • the positive pressure is provided on the inside 23 of the trailing edge portion 19 also in the normal blade or in the blade 11 according to this invention.
  • the warped line 16 of the leading edge portion 18 of the blade 11 is almost parallel'to or at a slight negative angle to the rotational direction so that only the impact force is applied to the leading edge portion 18 also at the moment of arrival at the flooded area 24 or thereafter, and the water pressure is supplied to the inside 23 of the blade 11 at the trailing edge portion 19 as viewed in FIG. 5 so that only the trailing edge portion 19 tends to bend upwards in FIG. 6.
  • the bending force is, however, absorbed by the groove 20 provided on the inside 23 of the blade 11. Therefore, the bending force does not influence the leading edge portion 18 and so the leading edge portion 18 of the blade 11 is not displaced with respect to face of the fan.
  • the abovementioned rate to the chord length of the bent portion of the leading edge shows the rate against the chord length of the length projected to the bent portion of the leading edge on the chord length.
  • said flexible fan having an angle a between a wing chord and the rotational direction of said fan blades and an angle B between said wing chord and a tangent line of a warped line in the'leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portion against a chord length of said fan blade is between 8 and percent.
  • a flexible fan comprising:
  • said flexible fan having anangle a between a wing chord and the rotational direction of said fan blades and an angle [3 between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portain against a chord length of said fan blade is between 20 and 24 percent.

Abstract

The invention relates to a flexible fan comprising, a boss portion and a plurality of fan blades radially extended from the boss portion and integrally formed therewith, the boss portion and the fan blades being of one piece construction and made of synthetic resin material, the flexible fan being characterized in that, alpha shows an angle of inclination of a wing chord against the rotational direction of the blade and beta shows an angle against the wing chord of a leading edge portion of the fan blades, and alpha </= beta is represented.

Description

United States Patent 1191 Hori et al.
11 3,822,103 July 2, 1974 [5 FLEXIBLE FAN [75] Inventors: Takanobu Hori; Masaharu Hayashi, both of Toyota; Motoharu Yoshida, lchimiya, all of Japan i 73 Assignee: Aisin SeikiKabushikiKaisha,
Kariya. Aichi Pref., Japan [22] Filed:' Dec. 26, 1972 1211 Appl. 1\16.5311;,421
[30] Foreign Application Priority Data [51] Int. Cl. F04d 29/38 58 Field f Search 416/132, 240, 241A [56] References Cited UNITED STATES PATENTS Antoni 416/132 x Japan 47 4800 521'u.s.c1.. ..416/-132,416 240,416/241 3,054,355 9/1962 Neely ..416/240x 3,409,968 1 1/1968 Denes' 3,584,969 6/1971 Aiki ct a1. 416/132 FOREIGN PATENTS OR APPLICATIONS 2,013,481 10/1970 Germany 416/132 Primary Examiner-Everette A. Powell, Jr. Attorney, Agent, or Firm-Pierce, Scheffler & Parker [57 ABSTRACT I The invention relates to a flexible fan/comprising, a boss portion and a plurality of fan blades radially extended from the boss portion and integrally formed therewith, the boss portion and the fan blades being of one piece construction and made of synthetic resin material, the'flexible fan being characterized in that, a
shows an angle of inclination of a wing chord against the rotational direction of the blade and B shows an angle against the wing chord of a leading edge portion of the-fan blades, and a 1 B is represented.
Clainis, 7 Drawing Figures PAIENIEDJuL 2:914 3.822.103
' sum 1 or 3 FIG.1
1 FLEXIBLE FAN BACKGROUND OF THE INVENTION that the road conditionsare satisfactory for running of the vehicle, if circumstances require the vehicle to run on a flooded road not only in the rainy season, but also Y in the normal state. In that case the water is driven up bythe front portion of the tire that is, the lowest portion of the fan is deformed and a lower part of the fan blade is flooded, sothat the blade is unusually deformed by the impact force of the water. The fan is susceptible to damage by contacting the radiator.
Therefore, in the conventional fan a large gap between the blade and the radiator is necessary in order to prevent'the fan from contacting with the radiator, or the thicknessof the leadingedge portion is reduced or a reinforced material is supplied. However, the cooling efficiency of the vehicle engine is reduced and an unreasonable arrangement in the engine compartment is necessary. The abovementioned drawbacks of the former is not fully overcome by the latter and further the weight of the fan blade is increased and the cooling efficiency of the vehicle engine is reduced in the latter.
SUMMARY OF THE INVENTION It is,itherefore, an object of the present invention to provide an improved fan assembly adapted for obviating the aforementioned drawbacks of the conventional fan assembly. I
It is another object of the present invention to provide an improved fan assembly for eliminating the displacement of thejleading edge portion of the blade toward the radiator when the blade encounters a flooded area. i c f It is still another object of the present invention to provide an improved fan assembly for raising the cooling efficiency of an engine by minimizing the gap between the radiator and the fan.
BRIEF DESCRIPTION OF THE DRAWINGS Various other objects," features and attendant advantages of this invention will be more fully appreciated as the same becomes better understood from the follow- 2 FIG. 5 is a distributive view of pressure operating the blades, when blades are flooded;
FIG. 6 is a view showingthe deformed condition of blades when the blades are flooded; and t I FIG. 7 is a view similar to that of FIG; 2, illustrating,
however, a fourth embodiment of this invention:
DESCRIPTION OF THE ILLUSTRATED I I EMBODIMENTS Referring now to the drawings, and more particularly to FIG. 1 thereof, the fanassembly of this invention will be described hereinbelow in detail.
In this Figure, the reference numeral 10 designates a fan boss and a plurality of blades 11 are radially extended'from an outerperipheral portion 12 of the fan boss 10. The fan boss 10 and the blades 11 are integrally formed and made of such as synthetic resin. The reference numeral 13 isa pilot hole for connecting with a pulley seat, not shown,and a plurality of bolt holes 14 is provided on the fanboss 10. The ventilation isgenerally ventilated almost parallel. to a rotational axle, not shown, Accordingto FIG. 2, the incidence angle against a rotational direction 15 of a warpedline 16 of the blades 11 in a leading edge portion 18 is" zero or a little negative angle-is applied to the leading edge portion l8. That is to say, supposing that an angle of inclination of a wing chord 17 against the rotational direction 15 of the warped line 16v is a and angle 6,, against the wing chord 17 of the leading edge portion 18 is nearly equal to the angled, or the angle [3, is only larger-than the angle a Next referring to FIG. 2, the reference numeral 18a shows a leadingedge portion of a conventional blade, and assuming that an angle against a wing chord 17a of the leading edge portion 18a against the extension of the warped line 16 is [32, an angle a of inclination of the wingichord 17a againstthe rotational direction 15, is larger than the angle'fi of the leading-edge portion 18a and the leading edge portion 18a is spread from the rotational direction 15 in the upper direction (toward the radiator, not shown). A groove'20 is provided on the middle portion of the blade 11 soas to easily bend a trailingedge portion 19 of the blade 11 when the hydraulic pressure orwind pressure is operated to the blade-'11 as shown in .FIGSJI and 2. An arc-shaped groove or a thin face 21 may be formed on the trailing edge portion 19 of the blade in order to specially bend ing detailed description when considered in connection with the accompanying drawings, wherein like reference characters designate like or corresponding parts throughout the several views and wherein:
FIG. 1 isa front view of the fan assembly of this inve'ntion,. but partially illustrated;
FIG.' 2 is a sectional view taken along the line II'-II of FIG. 1;
the trailing edge portion 19 thereof as viewed in FIG. 7.
As to the arrangement of the groove 20, it can be on a surface 22 or the inside surface 23, or on both the sur- 1 face 22 and the surface 23 as shownin FIG. 3. When the groove 20 is, however, provided on the surface 22 the ventilation speed of the surface 22 is swifter than I when on the inside 23 in the operating state, namely, Reynolds number ishigh and the fan efficiency is re-' I duced, therefore it is desirable to provide the groove 20 I on the inside 23. It is not necessary to provide the in this invention as viewed in FIG. 7.
When the blade 11 reaches a flooded area 24 in the increasing state of the number of fan rotation as seen groove 20, thearc-shaped groove, or the thin face 21 in FIG. 6, the impact force at this moment and the increasing pressure force on the inside 23 of the blade 11 are very large and the positive pressure is normally applied to the inside 23 of the leading edge portion .18 as shown in FIG. 5, but the negative pressure is supplied thereto in this invention. The positive pressure is provided on the inside 23 of the trailing edge portion 19 also in the normal blade or in the blade 11 according to this invention.
However, when the blade 11 reaches the flooded area 24 the blade 11 is bent almost parallel to the warped line 16a of the blade 11 in the normal fan and passes the flooded area 24, and then the blade 11 is restored to the original state.
The warped line 16 of the leading edge portion 18 of the blade 11 is almost parallel'to or at a slight negative angle to the rotational direction so that only the impact force is applied to the leading edge portion 18 also at the moment of arrival at the flooded area 24 or thereafter, and the water pressure is supplied to the inside 23 of the blade 11 at the trailing edge portion 19 as viewed in FIG. 5 so that only the trailing edge portion 19 tends to bend upwards in FIG. 6. The bending force is, however, absorbed by the groove 20 provided on the inside 23 of the blade 11. Therefore, the bending force does not influence the leading edge portion 18 and so the leading edge portion 18 of the blade 11 is not displaced with respect to face of the fan.
The result of the experiment between the fan accord- I ing to this invention and the fan according to conventional type is showed as follows;
Fan of this leading edge of fan (number of fan rotations 3000-3500 r.p.m.)
The abovementioned rate to the chord length of the bent portion of the leading edge shows the rate against the chord length of the length projected to the bent portion of the leading edge on the chord length.
lt is desirable, that the rate to the chord length'of one piece construction and made of synthetic res- Y inous material; said flexible fan having an angle a between a wing chord and the rotational direction of said fan blades and an angle B between said wing chord and a tangent line of a warped line in the'leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portion against a chord length of said fan blade is between 8 and percent.
2. The flexible fan as set forth in claim 1, wherein a groove is provided on said fan blade so that the trailing bent portion is 8-30 percent. But when the rate reaches over 8-3O percent the cooling efficiency becomes bad, and when the rate is under 20-24 percent the effect for preventing the bending becomes-little.
Obviously many changes and modifications of the edge portion of said fan blade is easily bent.
3. The flexible fan as set forth in claim 2, wherein said groove is formed on said trailing edgeportion.
4. The flexible fan as set forth in claim 2, wherein a thin face is formed on said trailing edge portion.
5. A flexible fan comprising:
a boss portion; and
a plurality of fan blades radially extended from said boss portion and integrally formed therewith; said boss portion and plurality of fan blades being of one piece construction and made. of synthetic resinous material;
said flexible fan having anangle a between a wing chord and the rotational direction of said fan blades and an angle [3 between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which a is not greater than B, said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portain against a chord length of said fan blade is between 20 and 24 percent.
6. The flexible fan as set forth in claim 5, wherein a groove is provided on said fan blade so that the trailing edge portion of said fan blade is easily bent.
7. The flexible fan as set forth in claim 6, wherein said groove is formed on said trailing edge portion.
8. The flexible fan as set forth in claim 6, wherein a thin face is formed on said trailing edge portion.

Claims (8)

1. A flexible fan comprising: a boss portion; and a plurality of fan blades radially extended from said boss portion and integrally formed therewith; said boss portion and plurality of fan blades being of one piece construction and made of synthetic resinous material; said flexible fan having an angle Alpha between a wing chord and the rotational direction of said fan blades and an angle Beta between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which Alpha is not greater than Beta , said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portion against a chord length of said fan blade is between 8 and 30 percent.
2. The flexible fan as set forth in claim 1, wherein a groove is provided on said fan blade so that the trailing edge portion of said fan blade is easily bent.
3. The flexible fan as set forth in claim 2, wherein said groove is formed on said trailing edge portion.
4. The flexible fan as set forth in claim 2, wherein a thin face is formed on said trailing edge portion.
5. A flexible fan comprisinG: a boss portion; and a plurality of fan blades radially extended from said boss portion and integrally formed therewith; said boss portion and plurality of fan blades being of one piece construction and made of synthetic resinous material; said flexible fan having an angle Alpha between a wing chord and the rotational direction of said fan blades and an angle Beta between said wing chord and a tangent line of a warped line in the leading edge of a leading edge portion in which Alpha is not greater than Beta , said warped line having a bent portion at said leading edge portion, and the bending rate of said bent portion in said leading edge portain against a chord length of said fan blade is between 20 and 24 percent.
6. The flexible fan as set forth in claim 5, wherein a groove is provided on said fan blade so that the trailing edge portion of said fan blade is easily bent.
7. The flexible fan as set forth in claim 6, wherein said groove is formed on said trailing edge portion.
8. The flexible fan as set forth in claim 6, wherein a thin face is formed on said trailing edge portion.
US00318421A 1972-01-08 1972-12-26 Flexible fan Expired - Lifetime US3822103A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP47004800A JPS512646B2 (en) 1972-01-08 1972-01-08

Publications (1)

Publication Number Publication Date
US3822103A true US3822103A (en) 1974-07-02

Family

ID=11593831

Family Applications (1)

Application Number Title Priority Date Filing Date
US00318421A Expired - Lifetime US3822103A (en) 1972-01-08 1972-12-26 Flexible fan

Country Status (3)

Country Link
US (1) US3822103A (en)
JP (1) JPS512646B2 (en)
GB (1) GB1379701A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914068A (en) * 1972-01-25 1975-10-21 Sueddeutsche Kuehler Behr Fan for motor vehicles
US4063826A (en) * 1975-05-20 1977-12-20 Waldemar Riepe Flexible, oscillating blade liquid pump
US4515511A (en) * 1982-12-31 1985-05-07 Siemens Aktiengesellschaft Axial fan with blades that automatically adjust to the direction of rotation
US4671739A (en) * 1980-07-11 1987-06-09 Robert W. Read One piece molded fan
US6554574B1 (en) * 1998-03-23 2003-04-29 Spal S.R.L. Axial flow fan
US6558123B1 (en) * 1998-03-23 2003-05-06 Spal S.R.L. Axial flow fan
US20090047131A1 (en) * 2007-08-14 2009-02-19 Neumann Joel G Electrical Generation Device - Turbine Rotor Shape For Electrical Power Generation From Moving Fluid
US20120100006A1 (en) * 2010-10-22 2012-04-26 Rolls-Royce Plc Blade
US10539157B2 (en) 2015-04-08 2020-01-21 Horton, Inc. Fan blade surface features
WO2022037850A1 (en) * 2020-08-17 2022-02-24 Siemens Aktiengesellschaft Fan, and dynamoelectric machine comprising a fan

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS53103907U (en) * 1977-01-26 1978-08-22
JPS6247800U (en) * 1985-09-12 1987-03-24

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798299A (en) * 1926-12-31 1931-03-31 Antoni Ugo Rotary flexible propeller
US3054355A (en) * 1961-04-25 1962-09-18 Lord Mfg Co Pump
US3409968A (en) * 1966-10-03 1968-11-12 Borg Warner Method of making a slotted blade by extruding
DE2013481A1 (en) * 1969-03-21 1970-10-08 Hill, Aubrey Colin, Warrnambool (Australien) Propeller
US3584969A (en) * 1968-05-25 1971-06-15 Aisin Seiki Flexible blade fan

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1798299A (en) * 1926-12-31 1931-03-31 Antoni Ugo Rotary flexible propeller
US3054355A (en) * 1961-04-25 1962-09-18 Lord Mfg Co Pump
US3409968A (en) * 1966-10-03 1968-11-12 Borg Warner Method of making a slotted blade by extruding
US3584969A (en) * 1968-05-25 1971-06-15 Aisin Seiki Flexible blade fan
DE2013481A1 (en) * 1969-03-21 1970-10-08 Hill, Aubrey Colin, Warrnambool (Australien) Propeller

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3914068A (en) * 1972-01-25 1975-10-21 Sueddeutsche Kuehler Behr Fan for motor vehicles
US4063826A (en) * 1975-05-20 1977-12-20 Waldemar Riepe Flexible, oscillating blade liquid pump
US4671739A (en) * 1980-07-11 1987-06-09 Robert W. Read One piece molded fan
US4515511A (en) * 1982-12-31 1985-05-07 Siemens Aktiengesellschaft Axial fan with blades that automatically adjust to the direction of rotation
US6554574B1 (en) * 1998-03-23 2003-04-29 Spal S.R.L. Axial flow fan
US6558123B1 (en) * 1998-03-23 2003-05-06 Spal S.R.L. Axial flow fan
US20090047131A1 (en) * 2007-08-14 2009-02-19 Neumann Joel G Electrical Generation Device - Turbine Rotor Shape For Electrical Power Generation From Moving Fluid
US7997870B2 (en) 2007-08-14 2011-08-16 B N Balance Energy Solutions, Llc Turbine rotor for electrical power generation
US20120100006A1 (en) * 2010-10-22 2012-04-26 Rolls-Royce Plc Blade
US8668456B2 (en) * 2010-10-22 2014-03-11 Rolls-Royce Plc Blade
US10539157B2 (en) 2015-04-08 2020-01-21 Horton, Inc. Fan blade surface features
US10662975B2 (en) * 2015-04-08 2020-05-26 Horton, Inc. Fan blade surface features
WO2022037850A1 (en) * 2020-08-17 2022-02-24 Siemens Aktiengesellschaft Fan, and dynamoelectric machine comprising a fan

Also Published As

Publication number Publication date
GB1379701A (en) 1975-01-08
JPS4874607A (en) 1973-10-08
JPS512646B2 (en) 1976-01-28

Similar Documents

Publication Publication Date Title
US3822103A (en) Flexible fan
US3751181A (en) Fan for cooling automotive vehicle engine
US5624234A (en) Fan blade with curved planform and high-lift airfoil having bulbous leading edge
US6287078B1 (en) Axial flow fan
US4222710A (en) Axial flow fan having auxiliary blade
US3044557A (en) Variable pitch fan blade
EP0192653A1 (en) High strength fan.
JP3082378B2 (en) Blower fan
US3373930A (en) Fan structure
US6206635B1 (en) Fan stator
GB1522594A (en) Supersonic blade cascades
US6402473B1 (en) Centrifugal impeller with high blade camber
US3584969A (en) Flexible blade fan
US2148555A (en) Propeller
US2149267A (en) Fan
US3915591A (en) Flexible blade fan
US3914068A (en) Fan for motor vehicles
US3356154A (en) Flexible blade engine cooling fan
US4105366A (en) Twisted flex fan
GB2055981A (en) Flexible fan
KR930004200B1 (en) Fan blade
US3901625A (en) Self-adjusting fan vane
US4147471A (en) Automotive cooling fan with biased flexible blades
US2370652A (en) Fan impeller
US3910718A (en) Limited deflection flexible bladed fan for use with viscous shear clutch