GB2079168A - Fluid filter - Google Patents

Fluid filter Download PDF

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Publication number
GB2079168A
GB2079168A GB8113751A GB8113751A GB2079168A GB 2079168 A GB2079168 A GB 2079168A GB 8113751 A GB8113751 A GB 8113751A GB 8113751 A GB8113751 A GB 8113751A GB 2079168 A GB2079168 A GB 2079168A
Authority
GB
United Kingdom
Prior art keywords
filter
fluid
filter medium
coarse
transmission
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.)
Granted
Application number
GB8113751A
Other versions
GB2079168B (en
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.)
SPX Corp
Original Assignee
SPX 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
Priority to US16769880A priority Critical
Application filed by SPX Corp filed Critical SPX Corp
Publication of GB2079168A publication Critical patent/GB2079168A/en
Application granted granted Critical
Publication of GB2079168B publication Critical patent/GB2079168B/en
Expired legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D35/00Other filtering devices; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B01D35/027Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
    • B01D35/0273Filtering elements with a horizontal or inclined rotation or symmetry axis submerged in tanks or reservoirs
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01MLUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/0004Oilsumps
    • F01M2011/0079Oilsumps with the oil pump integrated or fixed to sump
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16HGEARING
    • F16H57/00General details of gearing
    • F16H57/04Features relating to lubrication or cooling or heating
    • F16H57/0402Cleaning of lubricants, e.g. filters or magnets
    • F16H57/0404Lubricant filters

Abstract

A transmission fluid filter is arranged in the fluid circulation system of a transmission having a prespecified minimum operating temperature and a minimum fluid flow requirement for operation at the minimum operating temperature, and comprises a housing (10, 18) having a fluid inlet (36) and outlet (38), and a filter element (26) supported in the housing. The filter element is a composite assembly of a fine filtering medium (50), such as a phenolic resin-impregnated felt, having an opening therein, and a coarse filtering medium (54), such as polyester mesh, secured over the opening so as to provide through the respective media parallel continuous fluid flow paths. The surface area ratio of coarse to fine filter media is the minimum sufficient to permit the required flow through the coarse filtering medium at the prespecified minimum operating temperature. <IMAGE>

Description

SPECIFICATION Fluid filter The present invention relates to transmission fluid filters, and more particularly to continuous flow filters for transmissions having a prespecified minimum operating temperature.
It is conventional in transmissions for medium size automobiles to provide a transmission fluid filter having a filter medium consisting of a mesh or screen of natural or synthetic fibers or metal wire, for example. Such filter media are capable of filtering particles having a 130 micron particle mean size or diameter, and have been utilized satisfactorily for a number of years. However, the present trend towards "downsizing" of automobiles, including the transmission structure, requires more efficient filtration down to a particle size on the order of 60 microns, for example. Filter media have been proposed for enhanced filtering of particles in the transmission fluid down to the lesser particle size.However, under cold weather starting and operating conditions wherein the transmission fluid is substantially thickened, little fluid will flow through such felt filter media, which prevents proper shifting and operating of the transmission.
An object of the present invention is to provide a transmission fluid filter which provides minimum fluid flow needed for proper operation of the transmission at a minimum operating temperature prespecified by the transmission manufacturer, and which also under normal operating conditions provides enhanced filtering efficiency as compared with mesh and screen filters characteristic of the commercial prior art.
The invention resides in a transmission fluid filter comprising a filter element and support means for carrying said filter element to permit passage of transmission fluid through said element into a cavity defined between said Support means and said filter element and a fluid outlet from said cavity, said filter element -comprising a fine filter medium carried in a plane and having an aperture formed therein and a coarse filter medium secured to said fine filter medium covering said aperture in the plane of said fine filter medium such that said coarse and fine filter media provide separate parallel continuous flow paths for passage of filtered fluid to said cavity.
Also, in accordance with the invention there is provided, in a fluid circulation system in an automotive transmission having a prespecified minimum operating temperature and a minimum fluid flow requirement for operation of said prespecified minimum operating temperature, a transmission fluid filter comprising a housing having an inlet for receiving unfiltered fluid and an outlet, and filter medium means disposed within said housing between said inlet and said outlet, said filter medium means comprising separate coarse and fine filter media disposed for parallel continuous flow of fluid through said media, the surface area ratio of said coarse filter medium to said fine filter medium being a minimum sufficient to permit said minimum flow at said prespecified minimum operating temperature.
The invention is further described, by way of example, with reference to the accompanying drawings in which:~ Fig. 1 is a top plan view of one embodiment of a transmission fluid filter in accordance with the invention; Figs. 2 and 3 are sectional views taken along the respective lines 2-2 and 3-3 in Fig. 1; and Fig. 4 is an exploded elevational view of the transmission fluid filter shown in Figs. 1 to 3.
Referring to the drawings, one embodiment of a transmission fluid filter in accordance with the invention illustrated therein comprises a base pan 10 having a generally flat bottom wall 12 with a plurality of longitudinally extending parallel bosses or ribs 14 upstanding therefrom. A peripheral ledge 16 extends around base pan 10 and is spaced from the plane of wall 12. A cover 18 comprises a generally flat wall 20 and a plurality of longitudinally extending parallel ribs 22 integrally depending therefrom. A peripheral ledge 24 circumscribes cover 18 and is spaced from the plane of cover wall 20, as best seen in Figs. 2 and 3. A filter element 26 in the form of an elongated generally rectangular sheet is folded across its narrower dimension or width and disposed between cover 18 and base pan 10, with the three non-folded edges of filter element 26 extending around pan ledge 16.A flange 28 integrally extending from pan ledge 16 is crimped in sealing engagement over a lip 30 extending radially from cover ledge 24 so as to capture the filter element and cover in assembly against the pan ledge.
An inlet opening 32 (Fig. 4) in filter element 26 is aligned with a corresponding inlet opening 34 in cover wall 20, and is sealingly fastened thereto by a circumferentially continuous eyelet 36. A lift pipe 38 extends upwardly from an outlet opining 40 in cover 18 and is adapted at a cover-remc,.e end 42 to be press fitted into the fluid inlet opening of a transmission fluid pump 44. An annular lip 45 surrounds lift pipe 38 on an outer surface thereof so as to limit insertion of the lift pipe into pump housing 44. Lift pipe 38 thus serves the dual purposes of coupling outlet opening 40 of the transmission fluid filter to the pump housing 44 and of suspending the filter in a transmission fluid sump illustrated schematically at 46 in Fig. 3.As illustrated by the directional arrows in Fig. 3, transmission fluid is drawn in operation through eyelet 36 into the region between the folded and sandwiched planar sections of filter element 26, and then through the filter media into the respective cavities formed between the filter media and walls 1 2, 20. The filtered fluid then passes between base support ribs 14 and cover ribs 22 (which also serve to support the planar filter sections against suction from pump 44) to outlet opening 40, up lift pipe 38 and into the fluid pump housing. Preferably.
base pan 10 is provided in the form of a sheet metal stamping. Cover 18 and lift pipe 38 are provided as an integrally molded assembly of fiber-reinforced polyamide (nylon).
The filter element 26 comprises a composite assembly including a fine first filter medium 50 in sheet form having an opening or aperture 52 in its filter surface, and a coarse second filtering medium 54 secured to medium 50 over opening 52. Media 50, 54 provide separate continuous parallel flow paths for transmission fluid entering eyelet 36. As will be evident, the amount of fluid flowing through the parallel filter media 50, 54 will depend upon the resistance to fluid flow through the respective media which, in turn, is dependent in part upon fluid viscosity and temperature.In accordance with an important preferred feature of the present invention, the surface area ratio of coarse filter medium 54 to fine filter medium 50 is empirically selected as the minimum ratio sufficient to permit minimum flow of transmission fluid required for operation of the transmission at a particular minimum operating temperature prespecified by the transmission manufacturer. Stated differently, the surface area or amount of coarse filter medium 54 is the minimum necessary to provide minimum required fluid flow at prespecified minimum operating temperature, and the remainder of filter element 26 is the more efficient fine filter medium 50. This surface area ratio is presently determined by operating a transmission at the prespecified minimum operating temperature and varying the ratio of coarse to fine filter media until minimum fluid flow is obtained.
Preferably, coarse filter medium 54 comprises a screen of polyester monofilament woven in a 120 x 120 mesh i.e. a mesh having 120 x 120 openings over a square measuring 25.4 mm x 25.4 mm and having a 130 micron minimum particle size retention capability. Fine filter medium 50 comprises a phenolic resinimpregnated polyester felt having a 60 micron minimum particle size retention capability. In the particular filter shown in the drawings, coarse filter 54 occupies about 15% of the total filter surface area. This particular construction was found empirically to provide minimum flow requirements at a temperature of -34.40C for a particular model transmission.
It will be recognized that the particular filter assembly illustrated in the drawings is adapted for use in a particular transmission assembly. The invention, however, may be embodied in other types of filter structures for use in other transmission models without departing from the scope thereof. Two additional filter assembly structures in which the invention may be utilized are illustrated in U.S.A. Patent No. 4,136,011.
Similarly, filter media other than polyester mesh and resin-impr#gnated polyester felt may be utilized where greater or lesser filter efficiency is desired. Similarly, the ratio of coarse to fine filter surface area in the composite filter element will vary as a function of filter structure, transmission type and minimum specified operating temperature, as previously described.

Claims (6)

1. A transmission fluid filter comprising a filter element and support means for carrying said filter element to permit passage of transmission fluid through said element into a cavity defined between said support means and said filter element and a fluid outlet from said cavity, said filter element comprising a fine filter medium carried in a plane and having an aperture formed therein and a coarse filter medium secured to said fine filter medium# covering said aperture in the plane of said fine filter medium such that said coarse and fine filter media provide separate parallel continuous flow paths for passage of filtered fluid to said cavity.
2. In a fluid circulation system in an automotive transmission having a prespecified minimum operating temperature and a minimum fluid flow requirement for operation of said prespecified minimum operating temperature, a transmission fluid filter comprising a housing having an inlet for receiving unfiltered fluid and an outlet, and filter medium means disposed within said housing between said inlet and said outlet, said filter medium means comprising separate coarse and fine filter media disposed for parallel continuous flow of fluid through said media, the surface area ratio of said coarse filter medium to said fine filter medium being a minimum sufficient to permit said minimum flow at said prespecified minimum operating temperature.
3. A transmission fluid filter as claimed in claim 1 or 2, wherein said coarse filter medium comprises a mesh of woven fibres and said fine filter medium comprises resin-impregnated felt.
4. A transmission fluid filter as claimed in claim 3, wherein said coarse filter medium comprises a 120 x 120 mesh of polyester monofilament having a one hundred thirty micron particle diameter retention capability and said fine filter medium comprises a phenolic-impregnated polyester felt having a sixty micron particle diameter retention capability.
5. A transmission fluid filter as claimed in any preceding claim, wherein the surface area ratio of said coarse filter medium to said fine filter medium is substantially 85/1 5.
6. A transmission fluid filter, constructed substantially as herein described with reference to and as illustrated in the accompanying drawings.
GB8113751A 1980-07-11 1981-05-06 Fluid filter Expired GB2079168B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US16769880A true 1980-07-11 1980-07-11

Publications (2)

Publication Number Publication Date
GB2079168A true GB2079168A (en) 1982-01-20
GB2079168B GB2079168B (en) 1984-03-07

Family

ID=22608441

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8113751A Expired GB2079168B (en) 1980-07-11 1981-05-06 Fluid filter

Country Status (10)

Country Link
JP (1) JPS5938005B2 (en)
AU (1) AU540986B2 (en)
BE (1) BE888339A (en)
BR (1) BR8102560A (en)
CA (1) CA1159771A (en)
DE (1) DE3123269C2 (en)
FR (1) FR2486413B1 (en)
GB (1) GB2079168B (en)
IN (1) IN153653B (en)
MX (1) MX154375A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176416A (en) * 1985-06-08 1986-12-31 Sartorius Gmbh Fluid filter
US4889621A (en) * 1988-07-25 1989-12-26 Aisin Aw Co., Ltd. Oil strainer for an automatic transmission
FR2764636A1 (en) * 1997-06-17 1998-12-18 Ibs Filtran Kunststoff Metall OIL FILTER CARTRIDGE FOR ENGINE OR GEAR OIL PANES
US6488844B2 (en) 2001-01-23 2002-12-03 Federal-Mogul World Wide, Inc. Oil pan including a snap-fit cover and removable oil filter element
WO2002103170A1 (en) * 2001-06-15 2002-12-27 Sogefi Filtration Limited Filter arrangement
US6585889B2 (en) 2000-06-01 2003-07-01 Federal-Mogul World Wide Inc. Transmission oil pan module having filter with integrated drain plug

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3520876C1 (en) * 1985-06-11 1986-09-04 Peter Hufnagel Gmbh Device for feeding lubricating oil to the friction areas of a cam shaft.
JPH02239903A (en) * 1989-03-14 1990-09-21 Yamazaki Kiyouiku Kizai Kk Plane stock correction device
DE4003900A1 (en) * 1990-02-09 1991-04-11 Daimler Benz Ag Geared drive system with oil collector - has top inlet, and oil outlet closed by filter in container wall
DE4141823C2 (en) * 1991-12-18 1994-12-15 Mann & Hummel Filter Liquid filter
DE19508534A1 (en) * 1995-03-10 1996-09-12 Mann & Hummel Filter filter
DE19702404C2 (en) * 1997-01-24 1998-11-26 Johann Koppold Oil filter for cleaning the engine lubricating oil of petrol and diesel engines
DE19735445C2 (en) * 1997-06-17 1999-08-26 Ibs Filtran Kunststoff Metall Oil pan made of plastic for engines or transmissions
DE19731766B4 (en) * 1997-07-24 2007-07-12 Mahle Filtersysteme Gmbh Flat plate filter made of zig-zag folded filter web material and flat filter housing with such a plate filter
DE102005004287B4 (en) * 2005-01-28 2013-06-13 Mann + Hummel Gmbh Oil filter unit
DE102007005399A1 (en) * 2007-02-03 2008-08-07 Zf Friedrichshafen Ag Suction filter for use in oil sump, has upper shell including suction opening that is in connection with suction area, where sucking of oil from oil sump via suction opening at side of oil sump takes place in upper shell
DE102007023641B4 (en) * 2007-05-22 2015-04-02 Ibs Filtran Kunststoff-/ Metallerzeugnisse Gmbh Oil filter device
DE102008014416B4 (en) 2008-03-14 2014-12-18 Ibs Filtran Kunststoff-/ Metallerzeugnisse Gmbh Oil filter device
US8052867B2 (en) * 2008-04-03 2011-11-08 Filtran Llc Dual media fluid filter
JP6562753B2 (en) * 2015-07-31 2019-08-21 株式会社マーレ フィルターシステムズ Oil strainer

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559267A (en) * 1946-09-16 1951-07-03 Winslow Engineering Co Filter
US2850168A (en) * 1955-08-02 1958-09-02 Winslow Engineering And Mfg Co Full-flow filter
GB774968A (en) * 1955-08-05 1957-05-15 Fram Corp Improvements relating to oil filters
FR1189837A (en) * 1956-06-16 1959-10-07 Prec Mecanique Improved device for full flow filtration of fluids circulating in closed circuits
US3023906A (en) * 1958-11-21 1962-03-06 Winslow Engineering And Mfg Co Filter
NL130139C (en) * 1963-07-26
US3406832A (en) * 1964-06-10 1968-10-22 Gen Motors Corp Series parallel filter element
US3384241A (en) * 1966-01-12 1968-05-21 Nefco Filter Corp Graduated dual density liquid filter element
US3371793A (en) * 1966-05-12 1968-03-05 Gen Motors Corp Conformable oil filtering device
US3497065A (en) * 1966-11-01 1970-02-24 Gaf Corp Plate for plate and frame filter presses
BE629997A (en) * 1967-01-11 1900-01-01
US3480149A (en) * 1967-03-08 1969-11-25 Gen Motors Corp Flat casing filter device
DE7006262U (en) * 1970-02-21 1970-11-05 Mann & Hummel Filter DISPOSABLE FILTER FOR LIQUIDS.
GB1351220A (en) * 1970-06-22 1974-04-24 Bendix Corp Filter elements
US4056476A (en) * 1975-02-27 1977-11-01 Johnson & Johnson Blood filter media
US4136011A (en) * 1977-11-23 1979-01-23 Sealed Power Corporation Transmission fluid filter and method for manufacture thereof
US4187136A (en) * 1978-04-14 1980-02-05 Nelson Industries, Inc. Method of making a graduated density liquid filter element

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2176416A (en) * 1985-06-08 1986-12-31 Sartorius Gmbh Fluid filter
GB2176416B (en) * 1985-06-08 1989-07-26 Sartorius Gmbh Fluid filter
US4889621A (en) * 1988-07-25 1989-12-26 Aisin Aw Co., Ltd. Oil strainer for an automatic transmission
GB2221167A (en) * 1988-07-25 1990-01-31 Aisin Aw Co Oil filter
GB2221167B (en) * 1988-07-25 1992-07-15 Aisin Aw Co Oil strainer for an automatic transmission
FR2764636A1 (en) * 1997-06-17 1998-12-18 Ibs Filtran Kunststoff Metall OIL FILTER CARTRIDGE FOR ENGINE OR GEAR OIL PANES
US6585889B2 (en) 2000-06-01 2003-07-01 Federal-Mogul World Wide Inc. Transmission oil pan module having filter with integrated drain plug
US6488844B2 (en) 2001-01-23 2002-12-03 Federal-Mogul World Wide, Inc. Oil pan including a snap-fit cover and removable oil filter element
WO2002103170A1 (en) * 2001-06-15 2002-12-27 Sogefi Filtration Limited Filter arrangement

Also Published As

Publication number Publication date
JPS5732707A (en) 1982-02-22
AU6827381A (en) 1982-01-14
FR2486413B1 (en) 1985-05-17
BE888339A (en) 1981-10-09
FR2486413A1 (en) 1982-01-15
GB2079168B (en) 1984-03-07
IN153653B (en) 1984-08-04
CA1159771A1 (en)
AU540986B2 (en) 1984-12-13
BR8102560A (en) 1982-08-17
MX154375A (en) 1987-08-04
BE888339A1 (en)
DE3123269C2 (en) 1986-07-24
JPS5938005B2 (en) 1984-09-13
CA1159771A (en) 1984-01-03
DE3123269A1 (en) 1982-06-16

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PCNP Patent ceased through non-payment of renewal fee