US3728043A - Flexible blade fan with ribbed blades - Google Patents

Flexible blade fan with ribbed blades Download PDF

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Publication number
US3728043A
US3728043A US00217350A US3728043DA US3728043A US 3728043 A US3728043 A US 3728043A US 00217350 A US00217350 A US 00217350A US 3728043D A US3728043D A US 3728043DA US 3728043 A US3728043 A US 3728043A
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US
United States
Prior art keywords
blade
arm
improvement
ribs
extending
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
US00217350A
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English (en)
Inventor
S Pratinidhi
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
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Publication of US3728043A publication Critical patent/US3728043A/en
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
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
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
    • F04D29/38—Blades
    • F04D29/382—Flexible blades

Definitions

  • Winchester 57 ABSTRACT A flexible bladed automotive cooling fan in which the blades are provided with a plurality of radially spaced, transversely extending, raised ribs on the side thereof opposite the arms to which the blades are connected, the ribs extending from the leading edges of the arms to a position intermediate the trailing edges of the anns and the blades.
  • This invention relates to automotive cooling fans and more particularly to an improved flexible bladed fan.
  • the invention features, in a fan having a hub, a plurality of arms extending radially from the hub, and flexible blades connected adjacent their leading edges to the arms, the provision of a plurality of radially spaced, transversely extending raised ribs in the blades, the ribs extending from adjacent the leading edges of the arms to a position intermediate the trailing edges of the arms and the blades.
  • one of the ribs is positioned at the edge of each blade adjacent the hub, a plurality of ribs are positioned between the blade edge adjacent the hub and the tip end of the arm, and a radially extending rib or crimp is provided along the leading edge of the blade.
  • FIG. 1 is a plan view of the downstream side of a fan embodying the invention
  • FIG. 2 is a sectional view taken along the line 2-2 of FIG. I;
  • FIG. 3 is a sectional view taken along the line 3-3 of FIG. 2.
  • fan comprises a hub 12 having a plurality of arms 14 extending generally radially therefrom. Secured to each arm 14 is a fan blade 16 of resilient material, AISI 301 stainless steel, 0.015 inch thick, in a preferred embodiment.
  • Each blade 16 is positioned directly against the downstream side of an arm 14, having its leading edge 20, defined by the direction of fan rotation, forward of the leading edge 22 of the arm 14.
  • Blade 16 extends transversely to a trailing edge 24 behind the trailing edge 26 of arm 14 and is curved toward the downstream side behind arm 14, presenting a convex surface on the upstream side of the blade 16.
  • Blade 16 is secured to arm 14 by a plurality of fasteners, e.g., rivets l8, radially spaced along arm 14 and blade 16, the heads of the rivets bearing directly on the downstream side of the blade. Blade 16 extends radially along arm 14 and beyond theend thereof.
  • each blade 16 Radially spaced along each blade 16 are a plurality of raised ribs 28, 30, 32, 34, therein, protruding downstream away from arm 14 and extending transversely from adjacent the leading edge 22 of arm 14 to a position intermediate the trailing edges 24, 26 of blade 16 and arm 14, as best shown in FIGS. 2 and 3.
  • the leading edges 36 of ribs 28, 30, 32, 34 are aligned with the arm 14 leading edge 24 and the trailing edges 38 thereof are positioned immediatelyvbehind the arm 14 trailing edge 26 blending into the trailing portion of blade 16 as it curves downstream to minimize stress risers thereat.
  • One rib 28, essentially an upturned edge, is provided along the blade edge adjacent hub 12.
  • the other ribs 30, 32, 34 are radially spaced between rib 28 and the end of arm 14 with rivets 18 positioned therebetween.
  • a radially extending rib in the form of a crimp or bend along line 40 is provided along the entire leading portion of blade 16.
  • the blades 14 In operation, as fan 10 is rotated at increasing rotational speeds, the blades 14 decamber behind ribs 28, 30, 32, 34 due to the effects of centrifugal force and air pressure.
  • the ribs 28, 30, 32, 34 control the blade flexure and prevent stress risers around rivets 18.
  • Crimp 40 provides longitudinal blade stability.
  • the reinforcing cap usually employed with flexible bladed fans is eliminated with a resultant design simplification and weight and cost reduction without material functional impairment.
  • an automotive cooling fan comprising a hub, a plurality of arms radially extending from said hub, and radially extending resilient blades which decamber as rotational speed increases connected to said arms, said arms and blades also extending transversely between leading and trailing edges thereof defined by the direction of fan rotation, and said blades each connected adjacent its leading edge to arm and extending transversely to its trailing edge behind the trailing edge of said arm, that improvement in which each said blade is provided with a plurality of raised ribs radially spaced along said blade and extending transversely thereof from adjacent the leading edge of said arm to which said blade is connected to a position intermediate the trailing edges of said arm and said blade, said ribs raised on the side of said blade away from said arm.
  • said blade includes a transversely extending inner edge adjacent said hub and said ribs are radially spaced along said blade between said inner edge and the outer end of said arm.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US00217350A 1972-01-12 1972-01-12 Flexible blade fan with ribbed blades Expired - Lifetime US3728043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US21735072A 1972-01-12 1972-01-12

Publications (1)

Publication Number Publication Date
US3728043A true US3728043A (en) 1973-04-17

Family

ID=22810702

Family Applications (1)

Application Number Title Priority Date Filing Date
US00217350A Expired - Lifetime US3728043A (en) 1972-01-12 1972-01-12 Flexible blade fan with ribbed blades

Country Status (3)

Country Link
US (1) US3728043A (enrdf_load_stackoverflow)
JP (1) JPS4881110A (enrdf_load_stackoverflow)
CA (1) CA955905A (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860362A (en) * 1973-12-14 1975-01-14 Ford Motor Co Flexible bladed fan
USD245426S (en) * 1975-04-07 1977-08-16 Flex-A-Lite Corporation Fan
US4242046A (en) * 1978-06-15 1980-12-30 Wallace Murray Corporation Fan spider with rake angle
US4547126A (en) * 1983-12-08 1985-10-15 Jackson Samuel G Fan impeller with flexible blades
US20080101933A1 (en) * 2006-10-17 2008-05-01 Inventec Corporation Airflow generating apparatus
US10539157B2 (en) 2015-04-08 2020-01-21 Horton, Inc. Fan blade surface features

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111043079A (zh) * 2019-12-31 2020-04-21 潍柴动力股份有限公司 一种风扇叶片及风扇

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190912846A (en) * 1909-06-01 1910-04-21 William Cochrane An Improved Propeller for Ships, Boats, Flying Machines and the like.
DE559674C (de) * 1931-03-24 1932-09-23 Aeg Regelungsvorrichtung zur Veraenderung der Steigung eines Propellers, insbesondere zum Ansaugen der Kuehlluft fuer Kraftfahrzeuge
FR939847A (fr) * 1947-01-21 1948-11-25 Hélice aérienne souple
CH326684A (fr) * 1954-12-20 1957-12-31 American Radiator & Standard Hélice de ventilateur
US3406760A (en) * 1967-09-18 1968-10-22 Wallace Murray Corp Flexible blade fan
US3490686A (en) * 1968-03-14 1970-01-20 Wallace Murray Corp Fan drive
US3639079A (en) * 1970-03-12 1972-02-01 Fram Corp Flexible-bladed fan with improved reinforcing cap
US3679321A (en) * 1971-04-26 1972-07-25 Fran Corp Prestressed flexible bladed fan
US3698835A (en) * 1971-02-01 1972-10-17 John C Kelly Fan construction

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190912846A (en) * 1909-06-01 1910-04-21 William Cochrane An Improved Propeller for Ships, Boats, Flying Machines and the like.
DE559674C (de) * 1931-03-24 1932-09-23 Aeg Regelungsvorrichtung zur Veraenderung der Steigung eines Propellers, insbesondere zum Ansaugen der Kuehlluft fuer Kraftfahrzeuge
FR939847A (fr) * 1947-01-21 1948-11-25 Hélice aérienne souple
CH326684A (fr) * 1954-12-20 1957-12-31 American Radiator & Standard Hélice de ventilateur
US3406760A (en) * 1967-09-18 1968-10-22 Wallace Murray Corp Flexible blade fan
US3490686A (en) * 1968-03-14 1970-01-20 Wallace Murray Corp Fan drive
US3639079A (en) * 1970-03-12 1972-02-01 Fram Corp Flexible-bladed fan with improved reinforcing cap
US3698835A (en) * 1971-02-01 1972-10-17 John C Kelly Fan construction
US3679321A (en) * 1971-04-26 1972-07-25 Fran Corp Prestressed flexible bladed fan

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3860362A (en) * 1973-12-14 1975-01-14 Ford Motor Co Flexible bladed fan
USD245426S (en) * 1975-04-07 1977-08-16 Flex-A-Lite Corporation Fan
US4242046A (en) * 1978-06-15 1980-12-30 Wallace Murray Corporation Fan spider with rake angle
US4547126A (en) * 1983-12-08 1985-10-15 Jackson Samuel G Fan impeller with flexible blades
US20080101933A1 (en) * 2006-10-17 2008-05-01 Inventec Corporation Airflow generating apparatus
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

Also Published As

Publication number Publication date
JPS4881110A (enrdf_load_stackoverflow) 1973-10-30
CA955905A (en) 1974-10-08

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Legal Events

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