US3711219A - Fan connecting reinforcing cap to hub - Google Patents

Fan connecting reinforcing cap to hub Download PDF

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Publication number
US3711219A
US3711219A US00181664A US3711219DA US3711219A US 3711219 A US3711219 A US 3711219A US 00181664 A US00181664 A US 00181664A US 3711219D A US3711219D A US 3711219DA US 3711219 A US3711219 A US 3711219A
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US
United States
Prior art keywords
hub
plane
arms
improvement
reinforcing
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
US00181664A
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English (en)
Inventor
K Strick
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.)
Siemens Bendix Automotive Electronics Ltd
Bendix Engine Components Ltd
Fram Corp
Original Assignee
Fram Corp
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 Fram Corp filed Critical Fram Corp
Application granted granted Critical
Publication of US3711219A publication Critical patent/US3711219A/en
Assigned to SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS LIMITED reassignment SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS LIMITED MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: OCT. 1, 1988 Assignors: 67393 ONTARIO LIMITED, BENDIX ELECTRONICS LIMITED, SBAE CANADA HOLDINGS LIMITED
Assigned to BENDIX ELECTRONICS LIMITED reassignment BENDIX ELECTRONICS LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DATE: 06/02/86 Assignors: BENDIX ENGINE COMPONENTS LIMITED
Assigned to BENDIX ENGINE COMPONENTS LIMITED reassignment BENDIX ENGINE COMPONENTS LIMITED CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE 10-01-85 Assignors: CANADIAN FRAM LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • F04D29/34—Blade mountings
    • F04D29/36—Blade mountings adjustable
    • F04D29/362—Blade mountings adjustable during rotation
    • F04D29/366—Adjustment by interaction of inertion and lift
    • 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
    • F04D29/328—Rotors specially for elastic fluids for axial flow pumps for axial flow fans with unequal distribution of blades around the hub
    • 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
    • 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

Definitions

  • the invention features a blade on one side of each fan arm, a reinforcing cap fixedly connected by arm fastening members against the side of each blade opposite the associated arm and the extension of each reinforcing cap inwardly to the hub of the fan, each cap also being fixedly connected by a hub fastening member to the hub.
  • the invention additionally features positioning the blades on the downstream sides of the arms and the reinforcing caps on the downstream sides of the blades; the securement of the reinforcing caps to the hub in a second plane downstream ofa first plane defined at the position of joinder of the hub and the arms; a bead along the leading edge of the reinforcing caps; flexible fan blades and a leg of the reinforcing caps between the arms and blades preventing contact therebetween; ribs in the arms and hub; and the extension of the caps to the second plane to define a space between the caps at the junction of the arms to the hub.
  • FIG. 1 is a plan view of the upstream side of an engine cooling fan embodying the invention
  • FIG. 2 is an enlarged end view of an arm, blade and associated structure taken along the line 22 of FIG.
  • FIG. 3 is a reduced plan view of the downstream side of the arm, blade and associated structure taken along the line 33 of FIG. 2;
  • FIGS. 4, 5, 6 and 7 are enlarged sectional views taken, respectively, along the lines 44, 5-5, 6-6 and 7-7 of FIG. 1.
  • the fan 10 comprises, generally, a central hub 12, arms 24 integral with the hub and projecting radially therefrom, blades 32 on one side of the arms, reinforcing caps 36 wrapped about the leading edges of the blades, and arm fastening members in the form of rivets 40 fixedly connecting the blades and reinforcing caps to the arms.
  • the arms 24 are asymmetrically positioned about the hub 12 and are arranged for balance of the fan, the arcuate distances between radial reference lines at the arms (drawn parallel to the leading and trailing edges of the arms and the attached blades, respectively) being shown in FIG. 1.
  • the root 26 of each arm intermediate the hub 12 and the blade 32 is twisted as shown in FIGS. 2, 4, 5, 6 and 7, so that the plane of each arm throughout its major extent, between root26 and the outer tip 31 of blade 32, is at a 25 angle to the plane of fan rotation, i.e., the plane of the hub mounting face 14, where the blade is attached thereto.
  • each arm transversely comprises a planar leading portion 27 and, a trailing portion 28 curved toward the upstream side of the fan, i.e., convexly as viewed from the downstream side.
  • the hub and arms are formed of relatively rigid steel (SAE 950 AK steel, 0.120 inch thick).
  • each arm Positioned on the downstream side of each arm is a blade 32 curved, transversely between the leading edge 33 and trailing edge 35 thereof, away from the plane of arm 24, i.e., with the convex side of the blade adjacent the downstream side of the arm, best shown in FIG. 2.
  • the blade is formed of a resilient, flexible steel (AISI 301 stainless steel, 0.015 inch thick) and defines an air moving surface extending a substantial distance behind the trailing portion 28 of the arm 24.
  • the chord angle between the arm leading edge at 27 and the blade trailing edge 35 is about 45.
  • the mutual configuration of the arm trailing portion 28 and the blade 32 thereat provides a separation thereof at a generally acute angle as shown in FIG. 2.
  • a weight 34 Provided at the trailing edge 35 of each blade is a weight 34 comprising an integral portion of blade 32 folded back upon itself to engage the convex side of the blade, as shown and described in US. Pat. No. 3,594,098, issued July 20, 1971.
  • Reinforcing cap 36 comprises in section two generally parallel legs 37, 39, connected by a tubular bead 38 along the leading edge thereof.
  • the cap is constructed of light gage steel (SAE 950 A, cold rolled prepainted steel, 0.020 inch thick).
  • the reinforcing cap is located on the downstream side of arm 24 and sandwiches the leading portion and edge 33 of blade 32 therein between legs 37 and 39 as shown in FIG. 2.
  • Bead 38 is symmetrically arranged relative to legs 37, 39 and as shown in FIG. 3 extends radially the length of arm 24.
  • the bead 38 is accommodated in a corresponding concave groove or rib 30 on the downstream side of arm 24 extending radially the length of the arm and terminating at the inner end of the arm at hub 12.
  • the leg 39 on the upstream side of blade 32 conforms transversely to the shape of the downstream side of arm 24 particularly the curved trailing portion 28 thereof, extending slightly therebehind along the radial extent thereat of blade 32.
  • the downstream leg 37 extends transversely only a limited distance toward the trailing edge of arm 24, to the point at which the curvature of the trailing portion 28 commences, to avoidinterference with blade 32 in operation of the fan.
  • the cap extends radially outward along about 85 percent of the radial length of blade 32 whereas the arm extends along only about percent of the radial length of the blade.
  • Rivets 40 extending through arm 24, blade .32 and both legs 37, 39 of cap 36, and bearing on the upstream side of arm 24 and the downstream side of leg 37, fixedly connect blade and cap to arm 24.
  • the fan hub 12 comprises a planar mounting face 14 having a central pilot hole 16 and symmetrically disposed mounting holes 18 therethrough.
  • Mounting face 14 is in the same first plane as arms 24 .at the point of joinder of the root 26 thereof with hub 12, best shown in FIG. 7.
  • an annular groove 22 is formed to provide an annular rib 23 in a second plane axially spaced downstreamof the mounting face 14 and the first plane.
  • symmetrically disposed in the mounting face 14, between mounting holes 18, are a number of ribs or projections 20 extending to a third plane upstream of the mounting face 14 and the first plane.
  • cap 36 extends inwardly of the periphery of hub 12 and is fixedly connected by hub connecting member, rivet 42, through legs 37, 39 to rib 23 in the second plane downstream of the plane of mounting face 14 and arm 24.
  • Cap 36 extends in a straight line inwardly from adjacent blade 32 and the innermost of rivets 40, which is spaced radially outwardly from hub 12, contacting arm 24 at the outer portions of root 26, FIGS. 4, and 7, but, as the root 26 reaches the plane of its joinder to hub 12, FIGS. 6 and 7, the cap becomes axially spaced from root 26 as the cap continues in a straight line inwardly and downstream to rib 23.
  • the operation of the fan imposes bending and centrifugal stresses on the arms 24 which are at their highest level at the root 26 particularly where joined to the hub 12.
  • the bending stresses tend to bend the arms toward the upstream side of the fan.
  • the reinforcing cap may be of lighter materials than heretofore employed since the upstream legs 39, against which blade 32 decambers, is supported by arm 24.
  • materials costs may be lowered and a weight reduction achieved, a particularly important feature in automotive fans which are typically mounted in cantilever fashion on a water pump shaft and the weight of which affects the life of the water pump shaft and bearings.
  • the extension of the upstream leg 39 of prepainted cap 36 beyond the trailing edge of the arm 24 eliminates the necessity for prepainting the arms which is otherwise required if the blades 32 are able to contact the arms, thus achieving further production cost savings.
  • a fan comprising a hub, a plurality of arms in tegral with said hub and projecting outwardly therefrom, a blade positioned against one side of each of said arms, a reinforcing cap positioned against each said blade on the side thereof opposite the arm against which said blade is positioned, each said blade thereby positioned between an overlying cap and an arm, and arm fastening members radially spaced from said hub fixedly connecting each said blade and cap to an arm, that improvement in which each said reinforcing cap extends radially inwardly to said hub and hub fastening members are provided inwardly of the periphery of said hub fixedly connecting each of said reinforcing caps to said hub.
  • said hub has a central mounting face in said first plane and an annular rib about said mounting face, inwardly of said arms, said rib projecting said hub thereat downstream and defining on the downstream side thereof said second plane, said hub fastening members connecting said reinforcing caps in said second plane to the downstream side of said annular rib.
  • said reinforcing caps each comprise a pair of closely spaced legs sandwiching the leading portions of said blades therebetween, said legs connected by a tubular bead in said reinforcing cap, said bead extending radially and connecting said legs from adjacent said hub outwardly along said leading portion of said blade.
  • said hub has a central mounting face in said first plane and an annular rib about said mounting face, inwardly of said arms, said rib projecting said hub thereat downstream and defining on the downstream side thereof said second plane, said hub fastening members connecting said reinforcing caps in said second plane to the downstream side of said annular rib.
  • said blades each comprise a flexible, resilient member, extending transversely to a position trailing said arms, which decambers toward the upstream side of said fan as rotational speed increases, and the legs of said reinforcing caps on the upstream sides of said blades extending transversely from the leading edges of said blades to the trailing edges of said arms thereby preventing contact between said arms and said blades.
  • said blades and said reinforcing caps are positioned on the downstream side of said arms, said blades each comprise a flexible, resilient member, extending transversely to a position trailing said arms, which decambers toward the upstream side of said fan as rotational speed increases, and in which said reinforcing caps each comprise a pair of closely spaced legs sandwiching the leading portions of said blades therebetween, said legs integrally connected at the leading edges of said reinforcing caps and the legs of said reinforcing caps on the upstream sides of said blades extending transversely from the leading edges of said blades to the trailing edges of said arms.
  • said hub has a central mounting face in said first plane and an annular rib about said mounting face, inwardly of said arms, said rib projecting said hub thereat downstream and defining on the downstream side thereof said second plane, said hub fastening members connecting said reinforcing caps in said second plane to the downstream side of said annular rib.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00181664A 1971-09-20 1971-09-20 Fan connecting reinforcing cap to hub Expired - Lifetime US3711219A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18166471A 1971-09-20 1971-09-20

Publications (1)

Publication Number Publication Date
US3711219A true US3711219A (en) 1973-01-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00181664A Expired - Lifetime US3711219A (en) 1971-09-20 1971-09-20 Fan connecting reinforcing cap to hub

Country Status (10)

Country Link
US (1) US3711219A (fr)
JP (1) JPS4838505A (fr)
AU (1) AU456684B2 (fr)
BE (1) BE788971A (fr)
CA (1) CA959026A (fr)
DE (1) DE2244805C3 (fr)
FR (1) FR2154116A5 (fr)
GB (1) GB1400469A (fr)
IT (1) IT972099B (fr)
ZA (1) ZA725140B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799697A (en) * 1972-11-29 1974-03-26 Fram Corp Flexible bladed fan with tab connected reinforcing member
US3850545A (en) * 1972-09-07 1974-11-26 Hayes Albion Corp Flex fan
US6821091B2 (en) 2002-06-05 2004-11-23 Litex Industries Inc. Securing device
US20100028154A1 (en) * 2008-07-31 2010-02-04 Samsung Electronics Co., Ltd Axial flow fan
US9039377B2 (en) 2010-08-09 2015-05-26 Lowe's Companies, Inc. Fan assemblies and methods for assembling same
US20180187699A1 (en) * 2016-12-30 2018-07-05 Asustek Computer Inc. Centrifugal fan
US10480527B2 (en) 2017-05-05 2019-11-19 Robert Bosch Gmbh Axial fan with unbalanced blade spacing

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5113746Y1 (fr) * 1970-12-11 1976-04-13
JPS5732320Y2 (fr) * 1976-11-04 1982-07-15
JPS5936117B2 (ja) * 1977-01-19 1984-09-01 ウオ−レス・ムレイ・コ−ポレ−シヨン 薄板フアン組立体
CN111425454B (zh) * 2020-03-31 2021-11-09 Tcl空调器(中山)有限公司 轴流风叶和空调室外机
CN111911458B (zh) * 2020-09-22 2021-10-26 江西艾斯欧匹精密智造科技有限公司 一种用于风机的叶片

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1246086A (en) * 1916-11-04 1917-11-13 Ernst Glantzberg Fan or blower.
US2395193A (en) * 1944-04-24 1946-02-19 Torrington Mfg Co Propeller assembly
US3044557A (en) * 1959-01-08 1962-07-17 American Metal Prod Variable pitch fan blade
US3406760A (en) * 1967-09-18 1968-10-22 Wallace Murray Corp Flexible blade fan
US3594098A (en) * 1969-02-28 1971-07-20 Fram Corp Fan with weighted flexible blades
US3679321A (en) * 1971-04-26 1972-07-25 Fran Corp Prestressed flexible bladed fan

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289924A (en) * 1965-05-10 1966-12-06 William Wallace Corp Flexible blade fan

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1246086A (en) * 1916-11-04 1917-11-13 Ernst Glantzberg Fan or blower.
US2395193A (en) * 1944-04-24 1946-02-19 Torrington Mfg Co Propeller assembly
US3044557A (en) * 1959-01-08 1962-07-17 American Metal Prod Variable pitch fan blade
US3406760A (en) * 1967-09-18 1968-10-22 Wallace Murray Corp Flexible blade fan
US3594098A (en) * 1969-02-28 1971-07-20 Fram Corp Fan with weighted flexible blades
US3679321A (en) * 1971-04-26 1972-07-25 Fran Corp Prestressed flexible bladed fan

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3850545A (en) * 1972-09-07 1974-11-26 Hayes Albion Corp Flex fan
US3799697A (en) * 1972-11-29 1974-03-26 Fram Corp Flexible bladed fan with tab connected reinforcing member
US6821091B2 (en) 2002-06-05 2004-11-23 Litex Industries Inc. Securing device
US20100028154A1 (en) * 2008-07-31 2010-02-04 Samsung Electronics Co., Ltd Axial flow fan
US8303259B2 (en) * 2008-07-31 2012-11-06 Samsung Electronics Co., Ltd. Axial flow fan
US9039377B2 (en) 2010-08-09 2015-05-26 Lowe's Companies, Inc. Fan assemblies and methods for assembling same
US20180187699A1 (en) * 2016-12-30 2018-07-05 Asustek Computer Inc. Centrifugal fan
US10519979B2 (en) * 2016-12-30 2019-12-31 Asustek Computer Inc. Centrifugal fan
US10480527B2 (en) 2017-05-05 2019-11-19 Robert Bosch Gmbh Axial fan with unbalanced blade spacing

Also Published As

Publication number Publication date
FR2154116A5 (fr) 1973-05-04
GB1400469A (en) 1975-07-16
JPS4838505A (fr) 1973-06-06
AU4500572A (en) 1974-02-07
DE2244805B2 (de) 1979-01-25
AU456684B2 (en) 1975-01-09
DE2244805C3 (de) 1979-09-13
DE2244805A1 (de) 1973-03-29
IT972099B (it) 1974-05-20
BE788971A (fr) 1973-01-15
CA959026A (en) 1974-12-10
ZA725140B (en) 1973-04-25

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Date Code Title Description
AS Assignment

Owner name: BENDIX ELECTRONICS LIMITED

Free format text: CHANGE OF NAME;ASSIGNOR:BENDIX ENGINE COMPONENTS LIMITED;REEL/FRAME:005271/0503

Effective date: 19860105

Owner name: SIEMENS-BENDIX AUTOMOTIVE ELECTRONICS LIMITED

Free format text: MERGER;ASSIGNORS:SBAE CANADA HOLDINGS LIMITED;67393 ONTARIO LIMITED;BENDIX ELECTRONICS LIMITED;REEL/FRAME:005271/0515

Effective date: 19881001

Owner name: BENDIX ENGINE COMPONENTS LIMITED

Free format text: CHANGE OF NAME;ASSIGNOR:CANADIAN FRAM LIMITED;REEL/FRAME:005224/0475

Effective date: 19880911