EP0373322A1 - Knocked-down fan for engine cooling and other applications - Google Patents

Knocked-down fan for engine cooling and other applications Download PDF

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Publication number
EP0373322A1
EP0373322A1 EP89119282A EP89119282A EP0373322A1 EP 0373322 A1 EP0373322 A1 EP 0373322A1 EP 89119282 A EP89119282 A EP 89119282A EP 89119282 A EP89119282 A EP 89119282A EP 0373322 A1 EP0373322 A1 EP 0373322A1
Authority
EP
European Patent Office
Prior art keywords
fan
hub
assemblies
spokes
blades
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.)
Withdrawn
Application number
EP89119282A
Other languages
German (de)
English (en)
French (fr)
Inventor
Tomomi Masatsugu
Yoshiaki Matoba
Tomoharu Nonaka
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.)
Caterpillar Japan Ltd
Hoei Kogyo KK
Hoei Industries Co Ltd
Caterpillar Mitsubishi Ltd
Original Assignee
Hoei Kogyo KK
Hoei Industries Co Ltd
Caterpillar Mitsubishi Ltd
Shin Caterpillar Mitsubishi 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 Hoei Kogyo KK, Hoei Industries Co Ltd, Caterpillar Mitsubishi Ltd, Shin Caterpillar Mitsubishi Ltd filed Critical Hoei Kogyo KK
Publication of EP0373322A1 publication Critical patent/EP0373322A1/en
Withdrawn legal-status Critical Current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
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • 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
    • F04D29/34—Blade mountings

Definitions

  • This invention relates generally to fans, and particularly to those of the class used for engine cooling and like applications. Still more particularly, the invention pertains to a fan of novel knock-down construction designed for the ease of assemblage and high performance characteristics.
  • fan any propeller-type device for imparting motion and acceleration to air or other gases and operating on the centrifugal principle.
  • the invention should be construed to comprehend devices that may be commonly classified as blowers.
  • Internal-combustion engines such as those used on motor vehicles are normally equipped with a fan as a part of the engine-cooling system.
  • a fan Normally mounted on the water-­pump shaft driven from the engine via a fan belt, the engine fan functions to provide a powerful draft of air through the radiator.
  • a typical construction of the engine fan has been such that a set of fan blades have been riveted respectively to arms or spokes radiating from a hub.
  • the hub and spokes may be a unitary piece of sheet metal.
  • the present invention provides a fan of novel knocked-down construction whereby any desired practical number or size of fan blades can be employed without the possibility of interfering with the assemblage of fan.
  • each fan assembly comprises hub means having an axis of rotation, and a plurality of fan blades riveted or otherwise attached radially to the hub means with equal angular spacings between the fan blades.
  • the fan assemblies are combined by having their hub means joined together, typically by riveting, in axial alignment and with the fan assemblies angularly displaced from each other by half the pitch of the fan blades of each fan assembly.
  • the fan blades are to be riveted to the hub means of the two separate fan assemblies before they are joined together.
  • the angular distances between the fan blades are twice as much as those between the fan blades of the completed fan.
  • Each blade can therefore be riveted to the hub means of each fan assembly without being hampered by the neighboring blades.
  • the fan can be readily assembled with use of practically any desired number or size of blades to provide a desired rate of air delivery at constant pressure.
  • each fan assembly takes the form of a sheet-metal hub integral with radiating spokes each having one blade riveted thereto.
  • the spokes of both fan assemblies may be offset toward each other to an extent equal to half the thickness of the sheet metal of which hubs and spokes are made.
  • FIG.1 the knocked-down engine fan exemplifying the invention is shown as a combination of two fan assemblies 12 and 12′ of like construction disposed one behind the other.
  • the front fan assembly 12 is shown by itself in FIG.2, and the rear fan assembly 12′ in FIG.3.
  • FIGS.2 and 3 show the fan assemblies 12 and 12′ in the same angular positions about their axes as they are depicted in FIG.1.
  • the front fan assembly 12 comprises a hub member 14 known to the specialists as a spider because of the resemblance of its appearance, and a plurality of, four in this embodiment, fan blades 16 fastened to the spider 14.
  • This spider takes the form of a sheet-metal punching integrally comprising a hub 18 and a set of four arms or spokes 20 extending radially from the hub with a constant angular pitch spacing of 90 degrees.
  • the fan blades 16 are riveted at 22 to the respective hub spokes 20 via sheet-metal retainers 24, with each fan blade engaged between one hub spoke 20 and one retainer 24.
  • the four fan blades 16 of the front fan assembly 12 employed in this embodiment are angularly spaced from one another much more widely than the eight fan blades of the complete fan 10 of FIG.1. Therefore, if the fan blades 16 are riveted to the hub spokes 20 before the two fan assemblies 12 and 12′ are joined together, the riveting of each fan blade will not be hampered by the neighboring fan blades of the same fan assembly. It will also be understood that the width, or dimension in the circumferential direction of the fan, of each fan blade 16 can be far greater than if the fan 10 were not divided into the two separate assemblies 12 and 12′, as has been the case heretofore.
  • the hub 18 has a mounting hole 26 of relatively large diameter formed centrally therethrough for use in mounting the fan 10 on, for example, the water-pump shaft of an internal-combustion engine.
  • An annular row of six additional mounting holes 28 of smaller diameter are formed concentrically around the central mounting hole 26 for use in fastening the fan 10 to, for example, a fan pulley on the water-pump shaft.
  • Another annular row of eight holes 30 in the hub 18, also centered about the hub axis, are rivet holes for use in fastening together the two fan assemblies 12 and 12′.
  • the holes 26, 28 and 30 be formed in the hub 18 before the front fan assembly 12 is combined with the rear fan assembly 12′ as in FIG.1.
  • the rivet holes 30, in particular, should preferably be formed after the two fan assemblies 12 and 12′ are held together in the correct axial and angular positions as in FIG.1, in order to firmly unite the fan assemblies in the required relative positions.
  • the two fan assembly 12 and 12′ are fastened together by rivets 32 passing through the rivet holes 30 and 30′ in the hubs 18 and 18′.
  • the fan assemblies are united in alignment about the hub axis X-X but with an angular difference equal to half the pitch of the fan blades 16 and 16′ of each fan assembly. Since each fan assembly 12 or 12′ has four blades with a pitch angle of 90 degrees in this particular embodiment, the two fan assemblies 12 and 12′ are joined with an angular displacement of 45 degrees from each other about the hub axis X-X, providing a total of eight fan blades 16 and 16′ with an equal pitch spacing of 45 degrees.
  • FIG.4 shows only the spiders 14 and 14′ of the fan assemblies 12 and 12′ in their correct relative positions, together with only fan blade 16′ in order to reveal the twist imparted to each hub spoke 20 or 20′.
  • Such twist of the hub spokes 20 and 20′, and the resulting angles of the fan blades 16 and 16′ with respect to the principal plane of the fan 10, is of course needed for the air-moving function of the fan.
  • the two fan assemblies 12 and 12′ are essentially alike in construction, a slight difference exists in this embodiment in order to make the fan blades 16 and 16′ of both fan assemblies rotate in one and the same plane.
  • the hub spokes 20′ of the rear fan assembly 12′ are offset into coplanar relation with the hub spokes 20 of the front fan assembly 12, as discussed in more detail in the following.
  • each hub spoke 20′ of the rear fan assembly 12′ is each twisted at its region Y, in the immediate vicinity of the hub 18′, to hold the associated fan blade 16′ at the required angle set forth with reference to FIG.4.
  • each hub spoke 20′ is offset forwardly a distance equal to the thic­kness T of the sheet metal of which the spiders 14 and 14′ are made, into coplanar relation with the hub spokes 20 of the front fan assembly 12.
  • the hub spokes 20 and 20′ of both, rather than either, of the fan assemblies 12 and 12′ may be offset into coplanar relation with each other. This alternative is preferred because then both fan assemblies 12 and 12′ can be exactly alike in construction, making possible the easier mass production of fans at reduced costs.
  • FIGS.7A and 7B illustrate how to offset the hub spokes 20 and 20′ of both fan assemblies 12 and 12′. It will be seen that each hub spoke 20 or 20′ is offset at its twisted part Y a distance equal to half the thickness T of the sheet metal of which the spiders 14 and 14′ are made. So constructed, the spiders 14 and 14′ may be held against each other to bring their offset spokes 20 and 20′ into coplanar, interdigitating relation.
  • each fan blade 16 or 16′ illustrated therein is not of bilateral symmetry with respect to its centerline extending radially of the spider 14 or 14′. Therefore, in the fan assemblies 12 and 12′ constructed in accordance with the teachings of FIGS.7A and 7B, the two sets of fan blades 16 and 16′ must be riveted in the opposite directions to the hub spokes 20 and 20′. No such discrimination between the two sets of fan blades 16 and 16′ will be necessary in cases where the fan blades in use are of bilateral symmetry.
  • the mounting holes 26, 26′, 28 and 28′ and rivet holes 30 and 30′ may not necessarily be formed in the hubs 18 and 18′ before the fan assemblies 12 and 12′ are united as shown in FIG.1. Only the central mounting holes 26 and 26′ may be preformed in the hubs 18 and 18′ to facilitate the boring and other operations to be performed subsequently on the hubs.
  • the holes may be arranged as shown in FIG.5 in the hub 18′ of the rear fan assembly 12′ and as shown in FIG.8 in the hub 18 of the front fan assembly 12. Since each hub has four spokes in this embodiment, the eight rivet holes 30 and 30′ can be of the same arrangement in each hub 18, 18′.
  • the arrangement of the six mounting holes 28, 28′ must differ between the hubs 18 and 18′.
  • the angle Z, FIG.8. between one of the mounting holes 28 in the hub 18 and the centerline of the adjacent spoke 20 is 15 degrees whereas the angle Z′, FIG.5, between one of the mounting holes 28′ in the hub 18′ and the centerline of the adjacent spoke 20′ is 30 degrees.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
EP89119282A 1988-12-13 1989-10-17 Knocked-down fan for engine cooling and other applications Withdrawn EP0373322A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP16081688U JPH0280798U (enrdf_load_stackoverflow) 1988-12-13 1988-12-13
JP160816/88U 1988-12-13

Publications (1)

Publication Number Publication Date
EP0373322A1 true EP0373322A1 (en) 1990-06-20

Family

ID=15723042

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89119282A Withdrawn EP0373322A1 (en) 1988-12-13 1989-10-17 Knocked-down fan for engine cooling and other applications

Country Status (3)

Country Link
EP (1) EP0373322A1 (enrdf_load_stackoverflow)
JP (1) JPH0280798U (enrdf_load_stackoverflow)
CA (1) CA2000293A1 (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493342A1 (en) * 1990-12-21 1992-07-01 NEW HOLLAND FIAT S.p.A. Axial fan, particularly for motor vehicles for agricultural use

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2098640A (en) * 1936-05-15 1937-11-09 Hayes Ind Inc Fan construction
US2140017A (en) * 1938-07-15 1938-12-13 Westinghouse Electric & Mfg Co Fan construction
US2328072A (en) * 1941-06-18 1943-08-31 Edmund E Hans Fan
US2500071A (en) * 1948-03-12 1950-03-07 Edmund E Hans Fan
US2853140A (en) * 1956-01-03 1958-09-23 Brookside Products Company Inc Resiliently mounted impeller blades
US3147811A (en) * 1962-12-24 1964-09-08 Torrington Mfg Co Fan assembly
DE2710041A1 (de) * 1977-03-08 1978-09-14 Torin Corp Schaufelrad

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1213404A (en) * 1981-11-13 1986-11-04 Theodore E. Spielberg Ultrafiltering hybrid artificial organ

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2098640A (en) * 1936-05-15 1937-11-09 Hayes Ind Inc Fan construction
US2140017A (en) * 1938-07-15 1938-12-13 Westinghouse Electric & Mfg Co Fan construction
US2328072A (en) * 1941-06-18 1943-08-31 Edmund E Hans Fan
US2500071A (en) * 1948-03-12 1950-03-07 Edmund E Hans Fan
US2853140A (en) * 1956-01-03 1958-09-23 Brookside Products Company Inc Resiliently mounted impeller blades
US3147811A (en) * 1962-12-24 1964-09-08 Torrington Mfg Co Fan assembly
DE2710041A1 (de) * 1977-03-08 1978-09-14 Torin Corp Schaufelrad

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0493342A1 (en) * 1990-12-21 1992-07-01 NEW HOLLAND FIAT S.p.A. Axial fan, particularly for motor vehicles for agricultural use
US5221187A (en) * 1990-12-21 1993-06-22 Flatgeotechtechnologie Per La Terra S.P.A. Axial fan, particularly for motor vehicles for agricultural use

Also Published As

Publication number Publication date
JPH0280798U (enrdf_load_stackoverflow) 1990-06-21
CA2000293A1 (en) 1990-06-13

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