US20080216904A1 - Fuel supply system - Google Patents
Fuel supply system Download PDFInfo
- Publication number
- US20080216904A1 US20080216904A1 US11/836,421 US83642107A US2008216904A1 US 20080216904 A1 US20080216904 A1 US 20080216904A1 US 83642107 A US83642107 A US 83642107A US 2008216904 A1 US2008216904 A1 US 2008216904A1
- Authority
- US
- United States
- Prior art keywords
- fuel
- case
- filter
- supply system
- pump
- 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
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 105
- 239000002828 fuel tank Substances 0.000 claims abstract description 26
- 238000003466 welding Methods 0.000 claims description 13
- 239000011347 resin Substances 0.000 description 12
- 229920005989 resin Polymers 0.000 description 12
- 239000000428 dust Substances 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229930182556 Polyacetal Natural products 0.000 description 1
- 230000004323 axial length Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 229920006324 polyoxymethylene Polymers 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/44—Filters structurally associated with pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/04—Feeding by means of driven pumps
- F02M37/08—Feeding by means of driven pumps electrically driven
- F02M37/10—Feeding by means of driven pumps electrically driven submerged in fuel, e.g. in reservoir
- F02M37/103—Mounting pumps on fuel tanks
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/22—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system
- F02M37/32—Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines, e.g. arrangements in the feeding system characterised by filters or filter arrangements
- F02M37/50—Filters arranged in or on fuel tanks
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/50—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition
- B01D29/56—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with multiple filtering elements, characterised by their mutual disposition in series connection
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0273—Filtering elements with a horizontal or inclined rotation or symmetry axis submerged in tanks or reservoirs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
- B01D35/027—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks rigidly mounted in or on tanks or reservoirs
- B01D35/0276—Filtering elements with a vertical rotation or symmetry axis mounted on tanks or reservoirs
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T137/00—Fluid handling
- Y10T137/8593—Systems
- Y10T137/85978—With pump
Definitions
- the present invention relates to a fusel supply system for feeding under pressure fuel within a fuel to injectors of an internal combustion engine of a vehicle, and more particularly to a structure capable of improving a mounting property to the inside of the fuel tank and an antivibration property.
- a suction filter made of, for example, a nylon mesh material having relatively rough meshes
- foreign substances including foreign substances having passed through the suction filter and dust resulting from wear of a brush, a commutator and the like which form a motor unit of the fuel pump are captured by a high-pressure filter such as a filter element made of paper provided downstream of the fuel pump (that is, next stage of the fuel pump along a fuel flow path).
- the suction filter Since the suction filter is located in a so-called upstreammost position in a fuel supply line, the suction filter is generally located in a lowest bottom portion of the fuel tank so that fuel still can be supplied even though fuel remaining with the fuel tank is reduced.
- the high-pressure filter is provided on a flange of the fuel supply system, that is, directly underneath an upper side of the fuel tank so as to send fuel discharged from the high-pressure filter to, for example, a discharge pipe provided on the flange without any delay.
- a feeding pin can be insert molded in the lid and static electricity can be discharged from the lower housing.
- a lower housing is required to cover the height dimension of the filter element, and this means that a welding portion between the lid, which prevents the leakage of fuel, and the lower housing has to lie in the vicinity of a root portion where high stress is highly possibly expected to occur.
- the strength of the welding portion of resins tends to be lower than the strength of matrix resins, and because of this. Therefore, in case strong vibrations generated while the vehicle is being driven are applied to the welding portion, the welding portion may cracks and fuel leakage may be caused.
- a yoke included in the fuel pump includes a first cylindrical yoke disposed on an inner circumference of a ring-shaped magnet of a rare earth and a second cylindrical yoke provided on an outer circumference of the first cylindrical yoke, whereby even with a magnet of a rare earth of a high holding force which requires a strong magnetizing force, the degree of freedom in configuring a magnetic circuit by the magnet and the yoke increases, and the miniaturization of a magnetizer for the magnet and, hence, the reduction in the axial size of the fuel pump are able to be attained.
- An object of the invention is to provide a fuel supply system in which no fuel leakage is caused from not only the welding portions but also a filter case that accommodates a filter element therein by using a shortened fuel pump.
- a fuel supply system including: a flange mounted at an upper opening in a fuel tank; a fuel pump that discharges fuel in the fuel tank; a high-pressure filter that filters fuel discharged from the fuel pump; and a filter case that accommodates the high-pressure filter and includes an upper case and a lower case, the upper case integrally formed with the flange, wherein the fuel pump is fitted to an underside of the lower case to be positioned substantially coaxial with the high-pressure filter.
- FIG. 1 is an external perspective view of a fuel supply system according to an embodiment of the invention
- FIG. 2 is an exploded perspective view of the fuel supply system in FIG. 1 ;
- FIG. 3 is a sectional view of a fuel pump in FIG. 1 .
- a fuel supply system 101 includes: a flange 1 that is formed from an insulating resin and integrally molded to include an upper case 1 a that incorporates therein an element that forms a high-pressure filter (described later); a lower case 2 made from an insulating resin to be secured to the upper case 1 a through heat plate welding; a pump holder 3 engaged with the lower case through, for example, snap-fit and to hold therein a fuel pump (described later); and a suction filter 4 inserted from an opening in the pump holder 3 so as to be fitted to a suction port of the fuel pump.
- reference numeral 1 c denotes a connector molded integrally with the flange 1 for supplying electric power to the fuel pump, the illustration of lead wires that are provided to extend from the connector 1 c are omitted.
- a filter case 5 is formed by the upper case 1 a and the lower case 2 .
- An element 6 is inserted in the upper case 1 a .
- the element 6 is obtained by mounting a member 6 b on an outer circumference of an inner tube 6 a .
- the mounting member 6 b is obtained by forming a sheet of a material, such as resin fibers of polyester added to pulp, around an axis of the inner tube 6 a in a chrysanthemum-like fashion.
- the inner tube 6 a has upper and lower collar portions and which is formed from a conductive resin.
- An axial dimension of the upper case 1 a is equal to an overall length of the element 6 .
- the filter case 5 is formed by securing both the upper case 1 a and the lower case 2 together through heat plate welding, and as this occurs, since the inner tube 6 a and the lower case 2 are also welded together at the same time, the element 6 also comes to be secured.
- a plurality of communication holes which establish a communication between the inside and outside of the inner tube 6 a are provided in the vicinity of a lower portion of the upper collar portion of the inner tube 6 a , and the inner tube 6 a communicates with the discharge pipe 1 b . Therefore, a fuel path is secured from a discharge pipe of the fuel pump to the discharge pipe 1 b.
- An opening 3 a is provided in a bottom side of the pump holder 3 , and a recess portion is formed to match the configuration of a bottom portion of the fuel pump 7 (see FIG. 3 ), whereby when the fuel pump 7 is inserted into the pump holder 3 , the fuel pump 7 comes to be held in a predetermined position within the pump holder 3 .
- a suction port 21 a of the fuel pump 7 is positioned in the opening 3 a , a connecting portion 4 a of the suction filter 4 is connected to the suction port 21 a , whereby fuel inside the fuel tank (not shown) is sucked by the fuel pump 7 via the suction filter 4 .
- a fuel suction port 2 a is provided in the lower case 2 , and this fuel suction port 2 a is securely fitted on a discharge pipe 15 a of the fuel pump 7 via a connecting pipe 8 when the lower case 2 is engaged with the pump holder 3 through snap-fit in the way described above, whereby the fuel supply system 101 is completed, that is, a fuel flow path from the suction filter 4 to the discharge pipe 1 b is completed.
- the opening in the upper side of the fuel tank is closed by the flange 1 , and fuel inside the fuel tank is pressurized by driving the fuel pump 7 and supplied to injectors of a fuel injection system via a fuel hose (not shown) that is connected to the discharge pipe 1 b.
- the fuel pump 7 includes the motor portion 10 and a pump portion 20 .
- a magnet 13 of a cylindrical shape is disposed on an inner circumferential surface of a yoke 11 to be spaced at a predetermined distance from an outer circumferential surface of an armature 12 . Together with the yoke 11 , the magnet 13 forms a magnetic circuit at an outer circumference of the armature 12 .
- the yoke 11 includes a first cylindrical yoke 11 a and a second cylindrical yoke 11 b , which are made of an STKM (a carbon steel pipe for machine structure), in which the first cylindrical yoke 11 a is press fitted in the second tubular yoke 11 b from an axial direction until the first cylindrical yoke 11 a comes into abutment with a projecting portion 11 c of the second cylindrical yoke 11 b.
- STKM carbon steel pipe for machine structure
- the second cylindrical yoke 11 b integrates the following components together which include a bearing holder 15 , an inlet housing 21 and an outlet housing 22 .
- the bearing holder 15 which is formed of an insulating resin mainly made of polyacetal, accommodates therein a check valve 16 , a bearing 17 which supports the shaft 14 , a conductive brush 18 , a coil spring 19 which pushes the brush 18 against a commutator 12 a , a lead wire 18 a which supplies a current to the brush 18 through a connector 1 c (refer to FIG. 1 ) and the like.
- a shaft stopper 23 is accommodated in the inlet housing 21 , which is formed from a resin, and the inlet port 21 a is formed in the inlet housing 21 .
- the outlet housing 22 is also formed from a resin, and a discharge port 22 a is provided therein for discharging fuel which is pressurized in a flow path 24 toward the armature 12 , and a bearing 25 which rotatably supports the shaft 14 is also accommodated in the outlet housing 22 .
- a D-cut portion 14 a formed into a D-shape in cross section at an end portion of the shaft 14 is fitted in a D-shaped hole in a central portion of an impeller 26 formed from a resin and having a plurality of blade grooves formed on an outer circumference thereof.
- the flow path 24 is formed by the plurality of blade grooves on the impeller 26 and recessed grooves 21 b , 22 b respectively formed on the inlet housing 21 and the outlet housing 22 .
- the operation of the fuel pump 17 will be described.
- the armature 12 rotates together with the impeller 16 on the shaft 14 as a rotational shaft based on the principle of direct current electric motor.
- fuel within the fuel tank is introduced to the suction port 21 a after foreign matters contained therein have been removed at the suction filter 4 .
- the fuel is pressurized within the flow path 24 and passes through the discharge port 22 a , thereby entering a space within the motor portion 10 .
- the pressurized fuel When flowing through a space between the armature 12 and the magnet 13 inside the motor portion 10 , the pressurized fuel cools the armature 12 and causes the check valve 16 to open so as for the fuel to be discharged from the discharge pipe 15 a .
- the discharged pressurized fuel is introduced into the element 6 , where foreign substances including foreign matters having passed through the suction filter 4 and dust resulting from wear of the brush 18 and the like are captured, and is thereafter supplied to injectors of the fuel injection system.
- the filter case 5 is streamlined, or more specifically, an outside diameter thereof is made equal to or smaller than that of the pump holder 3 , and the filter case 5 and the pump holder 3 are provided so that axial centers thereof are aligned substantially coaxially. Consequently, a difference in outside diameter between the flange 1 and the filter case 5 can be increased without increasing (changing) the outside diameter of the flange 1 .
- the filter case 5 is formed by welding the upper case 1 a and the lower case 2 together, there occurs neither fuel leakage from the securing portion where the upper and lower cases are secured to each other through such welding nor reduction in fuel pressure due to such a fuel leakage. Furthermore, in the embodiment, since static electricity generated when the pressurized fuel passes through the element 6 is discharged via the inner tube 6 a , an inexpensive insulating resin is used for the upper case 1 a having a relatively large surface area, and since the upper case 1 a is formed integrally with the flange 1 , as described above, the securing portion resulting from the welding is provided below the element 6 . Namely, since the securing portion is spaced apart from the root portion so that generation of stress is reduced remarkably, the inexpensive fuel supply system can be provided which is free from fuel leakage from the securing portion which would otherwise be caused due to vibrations being applied thereto.
- the so-called heat plate welding becomes possible, whereby in conjunction with the fact that the formation of the filter case 5 is implemented at the same time that the element 6 is fixed, the production costs can be expected to be reduced.
- a pressure regulator used to maintain the pressure of fuel in supply thereof is not included, such a pressure regulator is not necessarily attached to the fuel supply system or is not necessarily an element in the fuel supply system. Instead, a method may be adopted in which a pressure regulator is provided outside the fuel tank and between the discharge pipe 1 b and the injectors, and a pipe for excess fuel therefrom is inserted into the fuel tank.
Abstract
A fuel supply system includes: a flange mounted at an upper opening in a fuel tank; a fuel pump that discharges fuel in the fuel tank; a high-pressure filter that filters fuel discharged from the fuel pump; and a filter case that accommodates the high-pressure filter and includes an upper case and a lower case, the upper case integrally formed with the flange. The fuel pump is fitted to an underside of the lower case to be positioned substantially coaxial with the high-pressure filter.
Description
- This application is based upon and claims the benefit of priority from Japanese Patent Application No. 2007-057516, filed on Mar. 7, 2007, the entire contents of which are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a fusel supply system for feeding under pressure fuel within a fuel to injectors of an internal combustion engine of a vehicle, and more particularly to a structure capable of improving a mounting property to the inside of the fuel tank and an antivibration property.
- 2. Description of the Related Art
- In order to capture foreign matters such as dust contained in fuel for stable supply of the fuel to, for example, injectors of a fuel injection system mounted on an engine, foreign matters contained in fuel within a fuel tank are firstly removed by a suction filter made of, for example, a nylon mesh material having relatively rough meshes, and then, foreign substances including foreign substances having passed through the suction filter and dust resulting from wear of a brush, a commutator and the like which form a motor unit of the fuel pump are captured by a high-pressure filter such as a filter element made of paper provided downstream of the fuel pump (that is, next stage of the fuel pump along a fuel flow path).
- Since the suction filter is located in a so-called upstreammost position in a fuel supply line, the suction filter is generally located in a lowest bottom portion of the fuel tank so that fuel still can be supplied even though fuel remaining with the fuel tank is reduced. On the other hand, in many cases, the high-pressure filter is provided on a flange of the fuel supply system, that is, directly underneath an upper side of the fuel tank so as to send fuel discharged from the high-pressure filter to, for example, a discharge pipe provided on the flange without any delay. Namely, as long as the fuel supply system can be accommodated within the fuel tank having a limited height dimension, it is conceivable that the fuel supply system is provided within the fuel tank to occupy the whole of the height dimension (for example, see JP-B-3256973 (from line 9 in a right-side column on
page 3 to line 49 in a left-side column on page 4, FIG. 1); hereinafter referred to as Document 1). - As shown in FIG. 1 of
Document 1, since a fuel pump having a relatively large capacity is used, the fuel pump and a high-pressure filter overlap each other, that is, the fuel pump is accommodated within an inner circumference of the high-pressure filter which is formed substantially into a C-shaped configuration (a filter housing inDocument 1; and hereinafter referred to as a housing). Therefore, a clearance between an opening in an upper side of a fuel tank and the housing becomes extremely small. Consequently, when accommodating the fuel supply system within the fuel tank, an edge portion of the opening in the upper side may contact with the housing, which may result in fuel leakage from the fuel tank due to a damage made as a result of the contact. - In view of a main feature of
Document 1, by dividing the housing into a first housing (a lid) and a second housing (a lower housing) and, furthermore, into an insulating part and a conductive part, a feeding pin can be insert molded in the lid and static electricity can be discharged from the lower housing. As a result, however, a lower housing is required to cover the height dimension of the filter element, and this means that a welding portion between the lid, which prevents the leakage of fuel, and the lower housing has to lie in the vicinity of a root portion where high stress is highly possibly expected to occur. In general, the strength of the welding portion of resins tends to be lower than the strength of matrix resins, and because of this. Therefore, in case strong vibrations generated while the vehicle is being driven are applied to the welding portion, the welding portion may cracks and fuel leakage may be caused. - WO2004/073145 discloses a further miniaturized fuel pump. Namely, a yoke included in the fuel pump includes a first cylindrical yoke disposed on an inner circumference of a ring-shaped magnet of a rare earth and a second cylindrical yoke provided on an outer circumference of the first cylindrical yoke, whereby even with a magnet of a rare earth of a high holding force which requires a strong magnetizing force, the degree of freedom in configuring a magnetic circuit by the magnet and the yoke increases, and the miniaturization of a magnetizer for the magnet and, hence, the reduction in the axial size of the fuel pump are able to be attained. An object of the invention is to provide a fuel supply system in which no fuel leakage is caused from not only the welding portions but also a filter case that accommodates a filter element therein by using a shortened fuel pump.
- According to an aspect of the invention, there is provided a fuel supply system including: a flange mounted at an upper opening in a fuel tank; a fuel pump that discharges fuel in the fuel tank; a high-pressure filter that filters fuel discharged from the fuel pump; and a filter case that accommodates the high-pressure filter and includes an upper case and a lower case, the upper case integrally formed with the flange, wherein the fuel pump is fitted to an underside of the lower case to be positioned substantially coaxial with the high-pressure filter.
-
FIG. 1 is an external perspective view of a fuel supply system according to an embodiment of the invention; -
FIG. 2 is an exploded perspective view of the fuel supply system inFIG. 1 ; and -
FIG. 3 is a sectional view of a fuel pump inFIG. 1 . - As shown in
FIG. 1 , afuel supply system 101 includes: aflange 1 that is formed from an insulating resin and integrally molded to include anupper case 1 a that incorporates therein an element that forms a high-pressure filter (described later); alower case 2 made from an insulating resin to be secured to theupper case 1 a through heat plate welding; apump holder 3 engaged with the lower case through, for example, snap-fit and to hold therein a fuel pump (described later); and a suction filter 4 inserted from an opening in thepump holder 3 so as to be fitted to a suction port of the fuel pump. In addition, whilereference numeral 1 c denotes a connector molded integrally with theflange 1 for supplying electric power to the fuel pump, the illustration of lead wires that are provided to extend from theconnector 1 c are omitted. In addition, afilter case 5 is formed by theupper case 1 a and thelower case 2. - An assembling procedure of this
fuel supply system 101 will be described with reference toFIG. 2 . Anelement 6 is inserted in theupper case 1 a. Theelement 6 is obtained by mounting amember 6 b on an outer circumference of aninner tube 6 a. Themounting member 6 b is obtained by forming a sheet of a material, such as resin fibers of polyester added to pulp, around an axis of theinner tube 6 a in a chrysanthemum-like fashion. Theinner tube 6 a has upper and lower collar portions and which is formed from a conductive resin. An axial dimension of theupper case 1 a is equal to an overall length of theelement 6. Namely, when theelement 6 is inserted into theupper case 1 a and the upper collar portion of theinner tube 6 a abuts on a ceiling of theupper case 1 a (in other words, a bottom side of the flange 1), a lower end face of theupper case 1 a and a projecting surface (formed into a convex shape and not shown) of the lower collar portion of theinner tube 6 a become flush with each other. On the other hand, upper end faces of thelower case 2 for respectively receiving surfaces of the lower end face and the projecting surface also become flush with each other. Namely, as described above, thefilter case 5 is formed by securing both theupper case 1 a and thelower case 2 together through heat plate welding, and as this occurs, since theinner tube 6 a and thelower case 2 are also welded together at the same time, theelement 6 also comes to be secured. - In securing the
element 6, in the event that for example, a terminal member of a conductive resin (not shown) is attached in advance to thelower case 2 to be exposed from an outer surface of thelower case 2, the projecting surface is welded to the terminal member, and by drawing an earth wire from this terminal member, static electricity generated in theelement 6 can be discharged. In addition, although a lower end of theinner tube 6 a is closed by virtue of the securing of theelement 6 in the way described above, since an inner wall of thelower case 2 forms a through hollow space and a space is formed between an inner wall of theupper case 1 a and theelement 6, fuel is allowed to flow into theelement 6. In addition, a plurality of communication holes which establish a communication between the inside and outside of theinner tube 6 a are provided in the vicinity of a lower portion of the upper collar portion of theinner tube 6 a, and theinner tube 6 a communicates with thedischarge pipe 1 b. Therefore, a fuel path is secured from a discharge pipe of the fuel pump to thedischarge pipe 1 b. - An
opening 3 a is provided in a bottom side of thepump holder 3, and a recess portion is formed to match the configuration of a bottom portion of the fuel pump 7 (seeFIG. 3 ), whereby when thefuel pump 7 is inserted into thepump holder 3, thefuel pump 7 comes to be held in a predetermined position within thepump holder 3. In addition, since asuction port 21 a of thefuel pump 7 is positioned in theopening 3 a, a connectingportion 4 a of the suction filter 4 is connected to thesuction port 21 a, whereby fuel inside the fuel tank (not shown) is sucked by thefuel pump 7 via the suction filter 4. - A
fuel suction port 2 a is provided in thelower case 2, and thisfuel suction port 2 a is securely fitted on adischarge pipe 15 a of thefuel pump 7 via a connectingpipe 8 when thelower case 2 is engaged with thepump holder 3 through snap-fit in the way described above, whereby thefuel supply system 101 is completed, that is, a fuel flow path from the suction filter 4 to thedischarge pipe 1 b is completed. By inserting thefuel supply system 101 so completed from an opening in an upper side of the fuel tank (not shown) the opening in the upper side of the fuel tank is closed by theflange 1, and fuel inside the fuel tank is pressurized by driving thefuel pump 7 and supplied to injectors of a fuel injection system via a fuel hose (not shown) that is connected to thedischarge pipe 1 b. - Next, the
fuel pump 7 and driving thereof will be described with reference toFIG. 3 . As shown inFIG. 3 , thefuel pump 7 includes themotor portion 10 and apump portion 20. In themotor portion 10, amagnet 13 of a cylindrical shape is disposed on an inner circumferential surface of ayoke 11 to be spaced at a predetermined distance from an outer circumferential surface of anarmature 12. Together with theyoke 11, themagnet 13 forms a magnetic circuit at an outer circumference of thearmature 12. In addition, theyoke 11 includes a firstcylindrical yoke 11 a and a secondcylindrical yoke 11 b, which are made of an STKM (a carbon steel pipe for machine structure), in which the firstcylindrical yoke 11 a is press fitted in the secondtubular yoke 11 b from an axial direction until the firstcylindrical yoke 11 a comes into abutment with a projectingportion 11 c of the secondcylindrical yoke 11 b. - By being bent toward an axial center of a
shaft 14 at both end portions, the secondcylindrical yoke 11 b integrates the following components together which include abearing holder 15, aninlet housing 21 and anoutlet housing 22. In addition, thebearing holder 15, which is formed of an insulating resin mainly made of polyacetal, accommodates therein acheck valve 16, abearing 17 which supports theshaft 14, a conductive brush 18, acoil spring 19 which pushes the brush 18 against acommutator 12 a, alead wire 18 a which supplies a current to the brush 18 through aconnector 1 c (refer toFIG. 1 ) and the like. - As for the
pump portion 20, ashaft stopper 23 is accommodated in theinlet housing 21, which is formed from a resin, and theinlet port 21 a is formed in theinlet housing 21. Theoutlet housing 22 is also formed from a resin, and adischarge port 22 a is provided therein for discharging fuel which is pressurized in aflow path 24 toward thearmature 12, and abearing 25 which rotatably supports theshaft 14 is also accommodated in theoutlet housing 22. A D-cut portion 14 a formed into a D-shape in cross section at an end portion of theshaft 14 is fitted in a D-shaped hole in a central portion of animpeller 26 formed from a resin and having a plurality of blade grooves formed on an outer circumference thereof. Theflow path 24 is formed by the plurality of blade grooves on theimpeller 26 andrecessed grooves 21 b, 22 b respectively formed on theinlet housing 21 and theoutlet housing 22. - Next, the operation of the
fuel pump 17 will be described. When current is supplied from the battery (not shown) to thearmature 12 via theconnector 1 c, thelead wire 18 a, the brush 18 and thecommutator 12 a, thearmature 12 rotates together with theimpeller 16 on theshaft 14 as a rotational shaft based on the principle of direct current electric motor. In conjunction with the rotation of theimpeller 26, fuel within the fuel tank is introduced to thesuction port 21 a after foreign matters contained therein have been removed at the suction filter 4. Then, the fuel is pressurized within theflow path 24 and passes through thedischarge port 22 a, thereby entering a space within themotor portion 10. When flowing through a space between thearmature 12 and themagnet 13 inside themotor portion 10, the pressurized fuel cools thearmature 12 and causes thecheck valve 16 to open so as for the fuel to be discharged from thedischarge pipe 15 a. The discharged pressurized fuel is introduced into theelement 6, where foreign substances including foreign matters having passed through the suction filter 4 and dust resulting from wear of the brush 18 and the like are captured, and is thereafter supplied to injectors of the fuel injection system. These are the summary and configuration of the fuel supply system of the embodiment. - Although not described in detail, since in particular, the axial length of the
fuel pump 7 is suppressed as much as possible, as shown inFIG. 1 , even in the event that theelement 6 and thefuel pump 7 are arranged in series in the vertical direction, when compared with the conventional fuel supply system, the overall lengths of the two systems differ little from each other. Then, thefilter case 5 is streamlined, or more specifically, an outside diameter thereof is made equal to or smaller than that of thepump holder 3, and thefilter case 5 and thepump holder 3 are provided so that axial centers thereof are aligned substantially coaxially. Consequently, a difference in outside diameter between theflange 1 and thefilter case 5 can be increased without increasing (changing) the outside diameter of theflange 1. This means that a sufficient clearance can be secured between the opening in the upper side of the fuel tank and thefilter case 5 without expanding the opening more than required. Therefore, when assembling thefuel supply system 101 into the fuel tank, a damage to thefilter case 5 can be prevented which would otherwise be made due to contact between the edge portion of the opening in the upper side of the fuel tank and thefilter case 5, hence, a fuel leakage from the damaged portion can be prevented. - In addition, since the
filter case 5 is formed by welding theupper case 1 a and thelower case 2 together, there occurs neither fuel leakage from the securing portion where the upper and lower cases are secured to each other through such welding nor reduction in fuel pressure due to such a fuel leakage. Furthermore, in the embodiment, since static electricity generated when the pressurized fuel passes through theelement 6 is discharged via theinner tube 6 a, an inexpensive insulating resin is used for theupper case 1 a having a relatively large surface area, and since theupper case 1 a is formed integrally with theflange 1, as described above, the securing portion resulting from the welding is provided below theelement 6. Namely, since the securing portion is spaced apart from the root portion so that generation of stress is reduced remarkably, the inexpensive fuel supply system can be provided which is free from fuel leakage from the securing portion which would otherwise be caused due to vibrations being applied thereto. - Furthermore, when forming (welding) the
filter case 5, since the lower end face of theupper case 1 a is flash with the projecting surface of the lower collar portion of theinner tube 6 a, and the upper end faces of the lower case which respectively forms the receiving surfaces of the lower end face and the projecting surface are also flush with each other, the so-called heat plate welding becomes possible, whereby in conjunction with the fact that the formation of thefilter case 5 is implemented at the same time that theelement 6 is fixed, the production costs can be expected to be reduced. In addition, in this embodiment, although a pressure regulator used to maintain the pressure of fuel in supply thereof is not included, such a pressure regulator is not necessarily attached to the fuel supply system or is not necessarily an element in the fuel supply system. Instead, a method may be adopted in which a pressure regulator is provided outside the fuel tank and between thedischarge pipe 1 b and the injectors, and a pipe for excess fuel therefrom is inserted into the fuel tank.
Claims (4)
1. A fuel supply system comprising:
a flange mounted at an upper opening in a fuel tank;
a fuel pump that discharges fuel in the fuel tank;
a high-pressure filter that filters fuel discharged from the fuel pump; and
a filter case that accommodates the high-pressure filter and includes an upper case and a lower case, the upper case integrally formed with the flange,
wherein the fuel pump is fitted to an underside of the lower case to be positioned substantially coaxial with the high-pressure filter.
2. The fuel supply system according to claim 1 , wherein an abutment position between the upper case and the lower case is arranged below the high-pressure filter.
3. The fuel supply system according to claim 1 , wherein an abutment position between a lower end face of the upper case and an upper end face of the lower case and an abutment position between a lower end face of the high-pressure filter and the upper end face of the lower case are at the same height.
4. The fuel supply system according to claim 2 , wherein the filter case is formed by welding at the abutment position.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007-057516 | 2007-03-07 | ||
JP2007057516A JP4561761B2 (en) | 2007-03-07 | 2007-03-07 | Fuel supply device |
Publications (1)
Publication Number | Publication Date |
---|---|
US20080216904A1 true US20080216904A1 (en) | 2008-09-11 |
Family
ID=39740440
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/836,421 Abandoned US20080216904A1 (en) | 2007-03-07 | 2007-08-09 | Fuel supply system |
Country Status (5)
Country | Link |
---|---|
US (1) | US20080216904A1 (en) |
JP (1) | JP4561761B2 (en) |
KR (1) | KR20080082425A (en) |
CN (1) | CN101260853B (en) |
TW (1) | TWI341365B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110192381A1 (en) * | 2010-02-09 | 2011-08-11 | Denso Corporation | Fuel supply apparatus |
US20180138775A1 (en) * | 2015-07-16 | 2018-05-17 | Continental Automotive Gmbh | Fuel delivery pump |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102052217B (en) * | 2009-11-05 | 2013-03-06 | 三菱电机株式会社 | Fuel supply device |
JP5110099B2 (en) * | 2010-02-09 | 2012-12-26 | 株式会社デンソー | Fuel supply device |
JP5713665B2 (en) * | 2010-12-27 | 2015-05-07 | 三菱電機株式会社 | Fuel supply device |
JP6444481B1 (en) * | 2017-12-14 | 2018-12-26 | 株式会社ケーヒン | Manufacturing method of fuel supply device |
WO2019151296A1 (en) * | 2018-02-01 | 2019-08-08 | 株式会社デンソー | Fuel supply device |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5520156A (en) * | 1993-02-26 | 1996-05-28 | Technoflow Tube-Systems Gmbh | Internal combustion engine apparatus with fuel filter for motor vehicle |
US20050118044A1 (en) * | 2003-02-14 | 2005-06-02 | Seizo Inoue | Dc motor type fuel pump |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0612100B2 (en) * | 1989-01-19 | 1994-02-16 | 京三電機株式会社 | Fuel supply system for automobiles |
JPH11241659A (en) * | 1998-02-25 | 1999-09-07 | Mitsubishi Electric Corp | Fuel supply device |
JP2004124817A (en) * | 2002-10-02 | 2004-04-22 | Mitsubishi Electric Corp | Fuel pump module, and fuel tank internal pressure sensor for vehicle |
JP2005226459A (en) * | 2004-02-10 | 2005-08-25 | Nifco Inc | Structure of joint of fuel filter with fuel pump |
-
2007
- 2007-03-07 JP JP2007057516A patent/JP4561761B2/en active Active
- 2007-08-09 US US11/836,421 patent/US20080216904A1/en not_active Abandoned
- 2007-09-04 TW TW096132840A patent/TWI341365B/en not_active IP Right Cessation
- 2007-09-12 KR KR1020070092620A patent/KR20080082425A/en not_active Application Discontinuation
- 2007-09-18 CN CN200710151283XA patent/CN101260853B/en not_active Expired - Fee Related
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5520156A (en) * | 1993-02-26 | 1996-05-28 | Technoflow Tube-Systems Gmbh | Internal combustion engine apparatus with fuel filter for motor vehicle |
US20050118044A1 (en) * | 2003-02-14 | 2005-06-02 | Seizo Inoue | Dc motor type fuel pump |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110192381A1 (en) * | 2010-02-09 | 2011-08-11 | Denso Corporation | Fuel supply apparatus |
US8869775B2 (en) | 2010-02-09 | 2014-10-28 | Denso Corporation | Fuel supply apparatus |
US20180138775A1 (en) * | 2015-07-16 | 2018-05-17 | Continental Automotive Gmbh | Fuel delivery pump |
US10330108B2 (en) * | 2015-07-16 | 2019-06-25 | Continental Automotive Gmbh | Fuel pump having electrically insulated bearings |
Also Published As
Publication number | Publication date |
---|---|
TW200837274A (en) | 2008-09-16 |
JP2008215305A (en) | 2008-09-18 |
KR20080082425A (en) | 2008-09-11 |
CN101260853A (en) | 2008-09-10 |
TWI341365B (en) | 2011-05-01 |
JP4561761B2 (en) | 2010-10-13 |
CN101260853B (en) | 2012-05-30 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: MITSUBISHI ELECTRIC CORPORATION, JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KANAMARU, SHIGEKI;YOSHIOKA, HIROSHI;REEL/FRAME:019673/0641 Effective date: 20070731 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |