US20080196678A1 - Radiator-Shroud Structure - Google Patents

Radiator-Shroud Structure Download PDF

Info

Publication number
US20080196678A1
US20080196678A1 US11/666,992 US66699205A US2008196678A1 US 20080196678 A1 US20080196678 A1 US 20080196678A1 US 66699205 A US66699205 A US 66699205A US 2008196678 A1 US2008196678 A1 US 2008196678A1
Authority
US
United States
Prior art keywords
radiator
rotary fan
shroud
air
guide portion
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.)
Abandoned
Application number
US11/666,992
Other languages
English (en)
Inventor
Naoya Kakishita
Itsuhel Kori
Tetsuzo Furuichi
Makoto Kameda
Yuji Inoue
Masayuki Ogasawara
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.)
Mitsubishi Fuso Truck and Bus Corp
Original Assignee
Mitsubishi Fuso Truck and Bus 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 Mitsubishi Fuso Truck and Bus Corp filed Critical Mitsubishi Fuso Truck and Bus Corp
Assigned to MITSUBISHI FUSO TRUCK AND BUS CORPORATION reassignment MITSUBISHI FUSO TRUCK AND BUS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OGASAWARA, MASAYUKI, KORI, ITSUHEI, KAKISHITA, NAOYA, FURUICHI, TETSUZO, INOUE, YUJI, KAMEDA, MAKOTO
Publication of US20080196678A1 publication Critical patent/US20080196678A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P11/00—Component parts, details, or accessories not provided for in, or of interest apart from, groups F01P1/00 - F01P9/00
    • F01P11/10—Guiding or ducting cooling-air, to, or from, liquid-to-air heat exchangers
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P2070/00—Details
    • F01P2070/50—Details mounting fans to heat-exchangers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F01P5/06—Guiding or ducting air to, or from, ducted fans

Definitions

  • the present invention relates to a radiator-shroud structure which is provided between a radiator and a fan of a vehicle so as to guide air, and more particularly, to a radiator-shroud structure capable of preventing reverse flow of centrifugal flow produced by means of a rotary fan.
  • an engine section 5 including a radiator 13 and a rotary fan 11 is disposed under a cab 3 , and air (wind) is taken from the outside via an air intake opening provided in an unillustrated front panel in the direction of arrow B, whereby the cooling capacity of the radiator 13 is enhanced.
  • a shroud 15 is provided between the radiator 13 and the rotary fan 11 , and guides air discharged from the radiator 13 to the rotary fan 11 .
  • Patent Document 1 Japanese Patent Application Laid-Open (kokai) No. 2002-38952
  • the shroud 15 is attached to the radiator 13 , and assumes a shape which surrounds the outer circumference of the rotary fan 11 . That is, as shown in FIG. 6 , the radiator 13 typically has a rectangular structure, and therefore, the shroud 15 assumes a rectangular shape at a connection portion at which the shroud 15 is connected to the radiator 13 . Further, since the radiator 13 is disposed at an inclined orientation so as to efficiently use a space, a lower side of the shroud 15 assumes a shape narrowing toward the rotary fan 11 . At a position corresponding to the outer circumference of the rotary fan 11 , the shroud 15 has a cylindrical surrounding portion 17 which surrounds the rotary fan 11 . Meanwhile, in the cab-over-type vehicle 1 , the rotary fan 11 is connected to the engine section 5 , because, in general, the rotary fan 11 rotates as a result of transmission of rotation of a crankshaft of the engine section 5 thereto.
  • Air having passed through the radiator 13 passes through the shroud 15 and the rotary fan 11 , and is discharged.
  • the clearance between the end of the fan and the shroud must be increased from the viewpoint of design of the vehicle.
  • an axial flow fan is employed, an air flow leaks through the clearance between the end of the fan and the shroud, and the amount of air passing through the radiator 13 decreases.
  • Such a leak which causes a reduction in the amount of air, can be prevented through employment of a fan which produces a centrifugal flow.
  • FIG. 8 shows the results of a simulation performed on turbulence of flow of air flowing through the radiator 13 , the shroud 15 , and the rotary fan 11 for the case where the shroud 15 is a conventional one.
  • a portion colored in black corresponds to a region where a large turbulence occurs.
  • the flow of air flowing out of the blade ends of the rotary fan 11 changes to the direction of arrow A′ or A′′, and turbulence occurs.
  • FIG. 8 also shows a flow of air which reversely flows from the end of the rotary fan 11 toward the radiator 13 . This reverse flow also hinders the flow of air discharged from the radiator 13 , and lowers the cooling capacity of the radiator.
  • this problem is not related to the present invention, and will not be described here.
  • the present invention has been accomplished in light of the above problems, and an object of the present invention is to provide a radiator-shroud structure which mitigates turbulence of centrifugally flowing air 21 discharged from the rotary fan 11 so as to suppress a decrease in the amount of air passing through the radiator 13 , to thereby enhance the cooling capacity of the radiator 13 .
  • the present invention which solves the above-described problem, is a radiator-shroud structure including a rotary fan which produces a centrifugal flow of air, a radiator provided in the vicinity of the rotary fan, and a shroud for forming an air guide passage extending from the radiator toward the rotary fan, the radiator-shroud structure being characterized by comprising a surrounding portion which surrounds the outer circumference of the rotary fan at one end of the shroud, and a guide portion extending from a circumferential edge of the surrounding portion in a radially outward direction.
  • the guide portion extending outward in the radial direction of the fan is provided at the circumferential edge of the surrounding portion of the shroud, the centrifugally flowing air discharged from the rotary fan flows along the guide portion. Therefore, the air flow turbulence at the end of the surrounding portion can be mitigated. Thus, a sufficient amount of air passing through the radiator is secured, and the cooling capacity of the radiator can be enhanced.
  • the width of the guide portion is desirably set to about 6% the diameter of the rotary fan. That is, when the rotary fan has a diameter of 500 mm, the width of the guide portion is about 30 mm. Further, the guide portion is desired to assume an annular shape and extend over the entire circumference. However, the guide portion may be partially removed so as to prevent interference with other parts such as a radiator hose.
  • the air flow turbulence at the end of the surrounding portion of the shroud can be mitigated, and the amount of air passing through the radiator is increased.
  • the cooling capacity of the radiator can be enhanced.
  • the clearance between the fan and the surrounding portion can be designed to be small so as to effectively prevent air leakage, and noise radiated from the shroud can be reduced.
  • FIG. 1 is a sectional view of a radiator-shroud structure according an embodiment of the present invention.
  • FIG. 2 is a perspective view of the radiator-shroud structure.
  • FIG. 3 shows results of flow simulation.
  • FIG. 4 is a graph showing the relation between length of a guide portion and air-amount change ratio.
  • FIG. 5 is an explanatory view of a cab-over-type vehicle.
  • FIG. 6 is a perspective view of a conventional radiator-shroud structure.
  • FIG. 7 is a sectional view of the conventional radiator-shroud structure.
  • FIG. 8 shows the results of simulation of turbulent flow for the case of the conventional radiator-shroud structure.
  • FIG. 1 is a sectional view of a radiator-shroud structure according an embodiment of the present invention
  • FIG. 2 is a perspective view of the radiator-shroud structure
  • FIG. 3 shows results of a simulation in which air flow is simulated for the case where the shroud has a guide portion
  • FIG. 4 is a graph showing the relation between length of the guide portion and air-amount change ratio.
  • a radiator 13 is attached to a frame extending under a cab 3 of a cab-over-type vehicle 1 .
  • the left side of the radiator 13 corresponds to the front direction of the vehicle 1 .
  • the radiator 13 is obliquely disposed as shown in the drawing in order to increase surface efficiency.
  • the rotary fan 11 can be of an axial flow type or a centrifugal flow type.
  • the rotary fan 11 is of an axial flow type, an air flow leaks at the clearance between the end of the fan and the shroud, and the amount of air passing through the radiator 13 decreases. Therefore, in the present embodiment, the rotary fan 11 is of a centrifugal flow type.
  • the centrifugal-flow-type rotary fan 11 can be obtained by determining the shape of the rotary fan 11 in consideration of the coarseness of the grid of the radiator 13 .
  • a shroud 15 is provided in order to guide to the rotary fan 11 air having passed through the radiator 13 .
  • the shroud 15 is formed of, for example, a metal or a resin, and is attached to the radiator 13 . As shown in FIG. 2 , at a portion where the shroud 15 is attached to the radiator 13 , the shroud 15 assumes a rectangular shape to match the shape of the radiator 13 . The shroud 15 narrows toward the rotary fan 11 , and in the vicinity of the rotary fan 11 , the shroud 15 is formed into a cylindrical shape so as to surround the rotary fan 11 . Further, in order to efficiently guide air to the rotary fan 11 , a tubular surrounding portion 17 is provided on the shroud 15 .
  • a guide portion 19 which preferably has an annular shape, is provided at an end portion of the surrounding portion 17 .
  • the surrounding portion 17 and the guide portion 19 of the shroud 15 may be formed as a single member or as separate members, which are then fixed together by use of rivets or the like.
  • the clearance between the shroud 15 and the rotary fan 11 is set to zero, from the viewpoint of efficient guiding of air.
  • the shroud 15 is attached to the radiator 13 and the rotary fan 11 is attached to the engine section 5 , the shroud 15 is designed and disposed in such a manner that a small space is provided between the shroud 15 and the rotary fan 11 in consideration of deformation and vibration during travel.
  • FIG. 3 shows the results of simulation of turbulent flow for the case where the guide portion 19 is provided. As can be seen from FIG. 3 , the turbulence is mitigated as compared with the case of FIG. 8 .
  • FIG. 4 shows the relation between the length of the guide portion 19 and the change ratio of amount of air passing through the radiator 13 .
  • the amount of air starts to increase when the length of the guide portion 19 is set to a or greater, and the increase in the amount of air saturates when the length becomes ⁇ or greater. Therefore, the length of the guide portion 19 is desired to be set to a value near ⁇ .
  • the present invention is not limited to the above-described embodiment, and may be modified in various manners, and these modifications fall within the technical scope of the present invention.
  • the length of the guide portion 19 is set to about 6% the diameter of the rotary fan 11 .
  • the length of the guide portion 19 is not limited thereto, and may change depending on the type of the rotary fan 11 , the shape of the shroud 15 , and the like.
  • the shroud may be fixed to the engine or the frame, rather than the radiator.
  • the vehicle is not limited to the cab-over-type vehicle, and the present invention can be applied to a hood-type vehicle.
  • the turbulence of air flowing out of the rotary fan 11 in the centrifugal direction can be mitigated, and the amount of air passing through the radiator 13 can be increased so as to enhance the cooling capacity of the radiator 13 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
US11/666,992 2004-11-04 2005-10-26 Radiator-Shroud Structure Abandoned US20080196678A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2004-320473 2004-11-04
JP2004320473A JP2006132379A (ja) 2004-11-04 2004-11-04 ラジエータ・シュラウド構造
PCT/JP2005/019668 WO2006049053A1 (ja) 2004-11-04 2005-10-26 ラジエータ・シュラウド構造

Publications (1)

Publication Number Publication Date
US20080196678A1 true US20080196678A1 (en) 2008-08-21

Family

ID=36319065

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/666,992 Abandoned US20080196678A1 (en) 2004-11-04 2005-10-26 Radiator-Shroud Structure

Country Status (7)

Country Link
US (1) US20080196678A1 (ja)
JP (1) JP2006132379A (ja)
KR (1) KR20070062595A (ja)
CN (1) CN101057064A (ja)
AU (1) AU2005301831A1 (ja)
DE (1) DE112005002736T5 (ja)
WO (1) WO2006049053A1 (ja)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120112492A1 (en) * 2009-05-05 2012-05-10 Eldon Grumbo Refuse vehicle with unique cab and method of manufacture
FR3016184A1 (fr) * 2014-01-07 2015-07-10 Peugeot Citroen Automobiles Sa Systeme de refroidissement d'un moteur a combustion interne
US9267419B2 (en) 2014-03-18 2016-02-23 Ford Global Technologies, Llc Convex fan shroud
US20230280100A1 (en) * 2022-03-07 2023-09-07 L & M Radiator, Inc. Radiator Assembly with Multiple Fans

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017095049A (ja) * 2015-11-27 2017-06-01 いすゞ自動車株式会社 車両用冷却装置
JP2018118571A (ja) * 2017-01-24 2018-08-02 いすゞ自動車株式会社 車両

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872916A (en) * 1973-04-05 1975-03-25 Int Harvester Co Fan shroud exit structure
US3903960A (en) * 1973-12-26 1975-09-09 Int Harvester Co Fan shroud entrance structure
US3937189A (en) * 1974-01-28 1976-02-10 International Harvester Company Fan shroud exit structure
US4061188A (en) * 1975-01-24 1977-12-06 International Harvester Company Fan shroud structure
US4136735A (en) * 1975-01-24 1979-01-30 International Harvester Company Heat exchange apparatus including a toroidal-type radiator
US4173995A (en) * 1975-02-24 1979-11-13 International Harvester Company Recirculation barrier for a heat transfer system
US5577888A (en) * 1995-06-23 1996-11-26 Siemens Electric Limited High efficiency, low-noise, axial fan assembly
US6142733A (en) * 1998-12-30 2000-11-07 Valeo Thermique Moteur Stator for fan
US20040146400A1 (en) * 2003-01-29 2004-07-29 Robb Neil E. Engine cooling fan having improved airflow characteristics
US20080193286A1 (en) * 2004-11-04 2008-08-14 Naoya Kakishita Radiator-Shroud Structure

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07238832A (ja) * 1994-02-25 1995-09-12 Toyo Radiator Co Ltd ファンシュラウド付き熱交換器

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872916A (en) * 1973-04-05 1975-03-25 Int Harvester Co Fan shroud exit structure
US3903960A (en) * 1973-12-26 1975-09-09 Int Harvester Co Fan shroud entrance structure
US3937189A (en) * 1974-01-28 1976-02-10 International Harvester Company Fan shroud exit structure
US4061188A (en) * 1975-01-24 1977-12-06 International Harvester Company Fan shroud structure
US4136735A (en) * 1975-01-24 1979-01-30 International Harvester Company Heat exchange apparatus including a toroidal-type radiator
US4173995A (en) * 1975-02-24 1979-11-13 International Harvester Company Recirculation barrier for a heat transfer system
US5577888A (en) * 1995-06-23 1996-11-26 Siemens Electric Limited High efficiency, low-noise, axial fan assembly
US6142733A (en) * 1998-12-30 2000-11-07 Valeo Thermique Moteur Stator for fan
US20040146400A1 (en) * 2003-01-29 2004-07-29 Robb Neil E. Engine cooling fan having improved airflow characteristics
US6827547B2 (en) * 2003-01-29 2004-12-07 Borgwarner Inc. Engine cooling fan having improved airflow characteristics
US20080193286A1 (en) * 2004-11-04 2008-08-14 Naoya Kakishita Radiator-Shroud Structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120112492A1 (en) * 2009-05-05 2012-05-10 Eldon Grumbo Refuse vehicle with unique cab and method of manufacture
US8590652B2 (en) * 2009-05-05 2013-11-26 Eldon Grumbo Refuse vehicle with unique cab and method of manufacture
FR3016184A1 (fr) * 2014-01-07 2015-07-10 Peugeot Citroen Automobiles Sa Systeme de refroidissement d'un moteur a combustion interne
US9267419B2 (en) 2014-03-18 2016-02-23 Ford Global Technologies, Llc Convex fan shroud
US20230280100A1 (en) * 2022-03-07 2023-09-07 L & M Radiator, Inc. Radiator Assembly with Multiple Fans

Also Published As

Publication number Publication date
JP2006132379A (ja) 2006-05-25
WO2006049053A1 (ja) 2006-05-11
CN101057064A (zh) 2007-10-17
KR20070062595A (ko) 2007-06-15
AU2005301831A1 (en) 2006-05-11
DE112005002736T5 (de) 2007-11-15

Similar Documents

Publication Publication Date Title
US20080193286A1 (en) Radiator-Shroud Structure
US4396351A (en) Engine cooling fan
US8573931B2 (en) Cooling apparatus for a motor vehicle
US20080196678A1 (en) Radiator-Shroud Structure
KR102169233B1 (ko) 방해받지 않는 출구를 구비하는 엔진 냉각 팬 캐스팅 셔라우드
US4173995A (en) Recirculation barrier for a heat transfer system
US4181172A (en) Fan shroud arrangement
TWI531723B (zh) 具有螺旋轂隔離槽之軸流風扇
US8459967B2 (en) Axial flow fan, in particular for a motor vehicle
EP0026997A1 (en) Shroud arrangement for engine cooling fan
JPH10205497A (ja) 冷却空気導入排出装置
US7632063B2 (en) Fan and blower unit having the same
JPH10115222A (ja) エンジン冷却装置
KR20140020329A (ko) 냉각팬 모듈
US20160305448A1 (en) Cooling fan module and system
JP2006132381A (ja) ラジエータ・シュラウド構造
JP2006132380A (ja) ラジエータ・シュラウド構造
EP2020489A1 (de) Vorrichtung zur Kühlung eines Motors
JP7429320B2 (ja) 送風装置
KR20100041127A (ko) 팬 및 쉬라우드 조립체
KR100648089B1 (ko) 축류송풍기
KR101156413B1 (ko) 팬 및 쉬라우드 조립체
JP6550909B2 (ja) 送風装置
JP5879203B2 (ja) 車両用送風装置
KR20030018118A (ko) 팬과 쉬라우드의 조립체

Legal Events

Date Code Title Description
AS Assignment

Owner name: MITSUBISHI FUSO TRUCK AND BUS CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAKISHITA, NAOYA;KORI, ITSUHEI;FURUICHI, TETSUZO;AND OTHERS;REEL/FRAME:020240/0253;SIGNING DATES FROM 20070516 TO 20070605

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION