CN106014723A

CN106014723A - Fuel supply apparatus

Info

Publication number: CN106014723A
Application number: CN201610182513.8A
Authority: CN
Inventors: 田村伸二; 铃木拓郎
Original assignee: Keihin Dock Co Ltd
Current assignee: Hitachi Astemo Ltd
Priority date: 2015-03-31
Filing date: 2016-03-28
Publication date: 2016-10-12
Anticipated expiration: 2036-03-28
Also published as: JP6487750B2; JP2016191339A; CN106014723B; BR102016006221A2; BR102016006221B1

Abstract

The invention provides a fuel supply apparatus by which the maximum liquid surface of fuel that when gas is sucked in a fuel pump from a vapor discharge channel when pores in a sucking filter are blocked can be adjusted without change on design of a filter apparatus. A surround wall, which encloses the periphery of the filter apparatus from overlook view, is formed on the upper part of the vapor discharge channel. An opening part is formed on the upper end or the side surface of the surround wall and is opened at the position bing higher than a lower end of the filter so as to communicate the internal spaces of the surround wall and the fuel pump. When the liquid level of fuel in the fuel tank is lower than the lower end of hte opening part, gas in the fuel tank is sucked into the fuel pump from the vapor discharge channel to cause adverse, thereby measuring pore blocking of the sucking filter in the fuel pump. The maximum liquid surface of fuel that when gas is sucked in a fuel pump from a vapor discharge channel when pores in a sucking filter are blocked can be adjusted just by simple change on design of height of the lower end of the opening part (the height of the upper end of hte surround wall), so that the structure, compared with design change of filter apparatus, is reduced in cost.

Description

Fuel supply system

Technical field

The present invention relates to fuel supply system, it has: housing, and it is installed into the peristome of closure fuel tank；Combustion Material pump, it is supported on described housing, is sprayed from ejiction opening by the fuel sucked from suction inlet through filter by suction Go out；Steam discharge hole, it is arranged on described petrolift, the steam produced is discharged in fuel；Steam is discharged Path, its one end is connected with described steam discharge hole and the other end extends to than this steam discharge hole position by the top； And defecator, it is connected with the other end of described steam drain passageway, and has cancellous filtration at outer peripheral face Device.

Background technology

This fuel supply system is known technology as disclosed in Patent Document 1.Fig. 1 of patent documentation 1 Fuel supply system described in Fig. 2 is provided with defecator 20, and this defecator 20 is from petrolift 18 The upper end of the steam drain passageway 42 that steam discharge hole 40 extends upward has the filter 58 being made up of porous body. Therefore, when the level of fuel of fuel tank is less than filter 58, it is arranged at the suction inlet 32 of petrolift 18 Filter by suction (not shown) there is eyelet blocking and steam discharge hole 40 when becoming negative pressure, from filter 58 The gas being inhaled into petrolift 18 through steam drain passageway 42 and steam discharge hole 40 can be supplied to electromotor, The undesirable conditions such as electromotor generation surge, thereby, it is possible to detect the eyelet blocking of the filter by suction of petrolift.

The applicant proposes the combustion of the defecator including possessing said function in Japanese Patent Application 2014-69877 Material feedway.The defecator at outer peripheral face with the tubular of multiple filter is connected to by this fuel supply system The upper end of steam drain passageway, and peristome (aperture) is set in the lower end of the cap assembly of the periphery covering defecator And make it connect with the inside of fuel tank.

Prior art literature

Patent documentation

Patent documentation 1: Japanese Unexamined Patent Publication 2013-117198 publication

It addition, in the case of the fuel in fuel tank is sky, when filter by suction eyelet blocks in the same manner as, from Petrolift supplies and is mixed with gas to the fuel of electromotor and makes electromotor produce undesirable condition, it is therefore desirable to distinguish This undesirable condition is owing to the fuel in fuel tank is that sky causes, or due to the filter by suction eyelet of petrolift Blocking causes.That is, if causing combustion during electromotor supply gas owing to the eyelet of filter by suction blocks Feed liquid face is low, then it is empty and make a distinction the situation of electromotor supply gas for being difficult to the fuel in fuel tank, thus It is difficult to determine the reason that electromotor produces undesirable condition.

The technology proposed as Japanese Patent Application 2014-69877, when the filter by suction eyelet of petrolift blocks, If the liquid level of fuel is below the height of the lower end of the filter of defecator, then electromotor can produce undesirable condition, The height becoming to make the lower end of the filter of defecator by design alteration uprises, it is possible to the fuel in fuel tank be Situation that is empty and that make electromotor produce undesirable condition makes a distinction, it is possible to the eyelet reliably detecting filter by suction blocks up Plug.

But, owing to defecator is combined with multiple filter, thus be formed as complicated shape, it is being set The problem that the cost of the mould that there will be shaped filtration device during meter change raises.

Summary of the invention

The present invention is exactly to complete in view of the foregoing, its object is to without being designed just changing to defecator When can adjust the blocking of filter by suction eyelet, gas is inhaled into the maximum liquid of the fuel of petrolift from steam drain passageway Face.

In order to reach above-mentioned purpose, the 1st aspect of the present invention proposes a kind of fuel supply system, and it has: housing, It is installed into the peristome of closure fuel tank；Petrolift, it is supported in described housing, will be through filter by suction And the fuel sucked from suction inlet sprays from ejiction opening；Steam discharge hole, it is arranged on described petrolift, will fire The steam produced in material is discharged；Steam drain passageway, its one end is connected with described steam discharge hole and the other end extends to Than this steam discharge hole position by the top；And defecator, it is connected with the other end of described steam drain passageway, And at outer peripheral face, there is cancellous filter, this fuel supply system is characterised by, at described steam drain passageway Top be provided with the surrounding wall of the periphery surrounding described defecator when top view, in the upper end of described surrounding wall Or side is formed with peristome, this peristome is at the position opening higher than the lower end of described filter, and encloses described Connect around the inner space of the inner space of wall with described fuel tank.

It addition, the 2nd aspect of the present invention proposes a kind of fuel supply system, its structure based on the 1st aspect, it is special Levying and be, described surrounding wall is integrated into the top of described steam drain passageway, and described peristome is formed on institute State the upper end of surrounding wall.

It addition, the 3rd aspect of the present invention proposes a kind of fuel supply system, its structure based on the 2nd aspect, it is special Levy and be, cover described surrounding wall and described defecator from top cap assembly, formed on the top of described cap assembly The space also will not being full of by fuel when even if to have the fuel in described fuel tank be full amount, upper at described defecator Portion is formed with the intercommunicating pore connected with described space, is being arranged at the sidewall of described cap assembly and vertically extending It is formed with described peristome between seam and the upper end of described surrounding wall.

Additionally, the 1st housing 11 of embodiment is corresponding to the housing of the present invention, the cover cylinder 36 of embodiment corresponds to The cap assembly of the present invention.

The effect of invention

According to the structure of the present invention the 1st aspect, fuel supply system has: housing, and it is installed into closure fuel tank Peristome；Petrolift, it is supported in housing, by the fuel that sucks from suction inlet through filter by suction from spray Outlet ejection；Steam discharge hole, it is arranged at petrolift, the steam produced is discharged in fuel；Steam is discharged logical Road, its one end is connected with steam discharge hole and the other end extends to than this steam discharge hole position by the top；And mistake Filter device, it is connected with the other end of steam drain passageway, and has cancellous filter at outer peripheral face.

When the filter by suction generation eyelet of petrolift blocks, the steam discharge hole of petrolift can become negative pressure, and The top of steam drain passageway is provided with the surrounding wall of the periphery surrounding defecator when top view, at surrounding wall Upper end or side are formed with peristome, the position opening that this peristome is high in the lower end than filter, and make surrounding wall Inner space connect with the inner space of fuel tank, therefore at the level of fuel of fuel tank higher than the lower end of peristome In the case of, from peristome flow into the fuel of inner space of surrounding wall in the filter of defecator by and by without barrier Suck petrolift with hindering.If it addition, the level of fuel of fuel tank is less than the lower end of peristome, then lodge in around After a small amount of fuel in the inner space of wall is inhaled into petrolift by the filter of defecator, pass through opening The gas in fuel tank behind portion can be inhaled into petrolift through steam drain passageway and steam discharge hole so that starts Machine becomes undesirable condition such that it is able to detect the eyelet blocking of the filter by suction of petrolift.

Only by carry out change peristome lower end height simple design alteration and without to owing to having filter And structure becomes in the case of complicated defecator is designed change, it becomes possible to adjust gas and be inhaled into petrolift The maximum fuel liquid level of fuel tank, therefore phase comparison defecator is capable of cost for being designed situation about changing Reduce.

It addition, according to the structure of the present invention the 2nd aspect, will be around wall and be integrally formed at the top of steam drain passageway, Peristome is formed around the upper end of wall, and therefore the shaping not only about wall becomes easy, additionally it is possible to be easily adjusted The height of peristome.

It addition, according to the structure of the present invention the 3rd aspect, cover surrounding wall and defecator from top with cap assembly, The space also will not being full of by fuel when even if the fuel that the top of cap assembly is formed in fuel tank is full amount, filtering The top of device is formed with the intercommunicating pore connected with space, is being arranged at the sidewall of cap assembly and vertically extending Being formed with peristome between seam and the upper end of surrounding wall, therefore at the fuel in fuel tank, for sky, petrolift sucks Time under the state of gas to fuel tank fuel feeding, the gas in petrolift can from steam discharge hole by steam drain passageway and The intercommunicating pore of defecator and be discharged in the space in cap assembly such that it is able to make fuel be full of the interior of petrolift Portion and prevent idle running.

Further, since peristome is covered by cap assembly, therefore it is less than opening when the level of fuel of fuel tank at level of fuel When there occurs variation under the state of the lower end in portion, entered the inner space of cap assembly, energy from peristome by suppression fuel Gas is enough made to suck petrolift from steam drain passageway, it is possible to reliably detect the eyelet blocking of filter by suction.And, If in the range of the seam of cap assembly, only just can be changed by the height of the upper end of the surrounding wall of change defecator The height of the lower end of peristome, therefore, it is possible to adjust gas to be inhaled into petrolift in the case of using same cap assembly The maximum fuel liquid level of fuel tank.

Accompanying drawing explanation

Fig. 1 is the axonometric chart of the fuel supply system of embodiment of the present invention.

Fig. 2 is the exploded perspective view of this fuel supply system.

Fig. 3 is the sectional view of the 3-3 line along Fig. 1.

Fig. 4 is the sectional view of the 4-4 line along Fig. 1.

Label declaration

T: fuel tank, Tb: peristome, 11: the 1 housings (housing), 13: petrolift, 22: suction inlet, 24: filter by suction, 25: steam discharge hole, 26: steam drain passageway, 26b: surrounding wall, 27: filter dress Put, 27a: intercommunicating pore, 28: filter, 36: cover cylinder (cap assembly), 36a: seam, 36b: space, 39: spray Outlet, 43: peristome.

Detailed description of the invention

Below according to accompanying drawing, embodiments of the present invention are described.

First, in Fig. 1～Fig. 4, at the base plate Ta (with reference to Fig. 3 and Fig. 4) of the fuel tank T being equipped on vehicle On, the present embodiment that the fuel in fuel tank T supplies the Fuelinjection nozzle (not shown) to electromotor is installed Fuel supply system D.

This fuel supply system D has: plastic 1st housing being installed on the base plate Ta of fuel tank T 11；Plastic 2nd housing 12 linked with the 1st housing 11 and be configured in fuel tank T；And quilt It is held in the petrolift 13 between the 1st housing the 11 and the 2nd housing 12.

Being formed with on 1st housing 11: the base portion 16 of bottomed cylindrical, its underpart has fuel and takes out pipe 14, Top has the mounting flange 15 that the peristome Tb of the base plate Ta around fuel tank T installs, and this base portion 16 is closed and opened Oral area Tb；Cross section is that a pair pump of arc-shaped keeps wall 17, and they erect from the bottom of this base portion 16；Surround wall 19, its by surround these pumps keep wall 17 bottom in the way of erect from the Inner peripheral portions of mounting flange 15, and with Pump keeps marking off bunkering portion 18 between wall 17；And bottom declines cartridge 20, it takes out pipe with fuel 14 erect from the bottom of base portion 16 communicatively, and bottom declines cartridge 20 and is connected as with the inner peripheral portion surrounding wall 19 Integrally.Bunkering portion 18 accepts the fuel in fuel tank T by surrounding the otch 21 of wall 19.Fuel takes out Pipe 14 can supply fuel to the Fuelinjection nozzle of not shown electromotor.

A pair pump holding wall 17 is configured to constitute the sidewall opposite each other of cylinder, keeps wall 17 at these pumps Inner circumferential on from top embed petrolift 13 is installed.The suction inlet 22 of petrolift 13 is prominent from its lower surface, should Suction inlet 22 connects the suction tube 23 having T-shaped, and the entrance connection of this suction tube 23 is accommodated in bunkering portion Cross section in 18 is the filter by suction 24 of arc-shaped.

In the diagram, the lower surface of petrolift 13 is provided with the steam row discharged by the steam produced in petrolift 13 Portal 25, steam discharge hole 25 by be formed at the intercommunicating pore 23a of the inside of suction tube 23 and with the steaming of L-shaped The lower end of vapour drain passageway 26 connects.This steam drain passageway 26 extends upward along the side of petrolift 13, The large-diameter portion 26a of upper end being formed at this steam drain passageway 26 is connected with the lower end of the defecator 27 of tubular.? The periphery of the first half of defecator 27 is provided with the filter 28 being made up of cancellous porous body, defecator 27 Inside and outside connected by this filter 28.It addition, intercommunicating pore 27a is in the upper end open of defecator 27, filter The inside and outside of device 27 is connected by this intercommunicating pore 27a.Big from steam drain passageway 26 of the surrounding wall 26b of tubular The periphery of footpath portion 26a extends in the way of surrounding the periphery of defecator 27 upward, the upper end of this surrounding wall 26b Reach the pars intermedia of the short transverse of filter 28.

In figs. 2 and 3, the 2nd housing 12 is formed with: cross section be arc-shaped be fitted together to wall 29 for a pair； The ejiction opening admission extinguisher 30 that one sidepiece of these two chimeric walls 29 is joined to one another；Cylindric actuator keeps Cylinder 31；Cylindric reinforcement cylinder 33, its in the substantially length range of this actuator holding cylinder 31 across space 32 Around this actuator holding cylinder 31, and the other side of two chimeric walls 29 is joined to one another；Radially join The multiple ribs 34 put, it links actuator holding cylinder 31 and strengthens cylinder 33 through space 32；With ejiction opening The top that one sidepiece of admission extinguisher 30 connects declines cartridge 35；And decline the side of cartridge 35 with this top The cover cylinder 36 that portion connects.Top declines cartridge 35 and actuator holding cylinder 31 is configured in ejiction opening admission extinguisher 30 Both sides, connection cartridge 37 be integrally formed at the 2nd housing 12, this connection cartridge 37 is to connect aforementioned three 30, the mode of 31,35 linearly and flatly configures.Regulation is made being internally formed of this connection cartridge 37 Device holding cylinder 31, ejiction opening admission extinguisher 30 decline, with top, the intercommunicating pore 37a that the inside of this three of cartridge 35 connects. The peristome of intercommunicating pore 37a is closed by key 38.

The wall 29 that is fitted together to for a pair of the 2nd housing 12 is configured to constitute the sidewall opposite each other of cylinder, and its underpart is embedding Together in the periphery of minor diameter part 13a on the top of petrolift 13, and it is embedded in pump and keeps the inner circumferential of wall 17.And, Pump keeps wall 17 and chimeric wall 29 cooperation to keep petrolift 13.Petrolift 13 makes ejiction opening 39 end face from it Prominent, this ejiction opening 39 is embedded in the inner circumferential of ejiction opening admission extinguisher 30 by seal member 40.It addition, top Decline cartridge 35 and be embedded in the upper end of bottom decline cartridge 20 by seal member 41.Therefore, from combustion The fuel of ejiction opening 39 ejection of material pump 13 declines cartridge 35 by top from intercommunicating pore 37a and bottom declines Cartridge 20 and be supplied to fuel take out pipe 14.It addition, the inner circumferential in actuator holding cylinder 31 is pressed into pressure tune The urceolus 42a of joint device 42, and the bottom of actuator holding cylinder 31 is riveted on interior side, so that this urceolus 42a Fixed.

In the diagram, the cover cylinder 36 of the 2nd housing 12 is at the defecator 27 of the upper end covering steam drain passageway 26 While be embedded in surrounding wall 26b and the periphery of large-diameter portion 26a.It is formed at above-below direction in the side of cover cylinder 36 Extend and seam 36a that lower end is open, cover cylinder 36 inside and outside by the upper end in the upper end of seam 36a with surrounding wall 26b Between formed peristome 43 and connect.Position by the top, the upper end of the ratio seam 36a in the inside of cover cylinder 36, The space 36b also will not being full of by fuel when even if the fuel being formed in fuel tank T is completely measured.

In FIG, arm 44 is flatly stretched out from the side strengthening cylinder 33 of the 2nd housing 12.? The terminal part of this arm 44 is provided with liquid level sensor 45, the rotor 45a of this liquid level sensor 45 with Swing arm 47 links, and swing arm 47 is bearing in float floating on the level of fuel in fuel tank T by terminal part 46.Therefore, in owing to the fuel make up of fuel tank T and the fuel consumption of electromotor are made fuel tank T During level of fuel lifting, float 46 can lift therewith, and therefore the height change of level of fuel can be as swing arm 47 Pendulum angle and be delivered to liquid level sensor 45, liquid level signal is exported to not shown by liquid level sensor 45 Display part.

And, by making multiple engagement pawl 29a being arranged on the chimeric wall 29 of the 2nd housing 12 locking to being arranged at The pump of the 1st housing 11 keeps in the multiple stop hole 17a on wall 17, the 1st housing the 11 and the 2nd housing 12 by with The mode that can dismount combines.

Then, the effect possessing the embodiment of the present invention of said structure is described.

In figure 3, by the operating of petrolift 13, the fuel in fuel tank T is in the suction in bunkering portion 18 In filter 24 by and after being filtered, be inhaled into suction inlet 22 through suction tube 23.Spray from ejiction opening 39 Fuel from connection cartridge 37 intercommunicating pore 37a through top decline cartridge 35, bottom decline cartridge 20 Take out pipe 14 with fuel and be supplied to electromotor.Now, pressure regulator 42 is by the ejiction opening from petrolift 13 The residual compression part of 39 fuel being ejected into intercommunicating pore 37a is discharged in fuel tank T, will take out pipe 14 from fuel Supply is adjusted to setting to the fuel pressure of Fuelinjection nozzle.

In the diagram, the steam produced in the inside of petrolift 13 can be arranged from the steam discharge hole 25 of petrolift 13 Go out the lower end to steam drain passageway 26, and fill in the filtration having passed through to be connected with the upper end of steam drain passageway 26 After putting filter 28 or the intercommunicating pore 27a of 27, from peristome 43 quilt on the top of the seam 36a being formed at cover cylinder 36 It is discharged in fuel tank T, thus is mixed into steam during the fuel to electromotor supply can be prevented.

Then, illustrate that gas (air and the gaseous mixture of steam) is inhaled into fuel to the fuel in fuel tank T for sky The state of the inside of pump 13 supplies oil condition to fuel tank T.

In figs. 3 and 4, when the level of fuel in fuel tank T be gradually increasing by fuel feeding, fuel is flowed into combustion Time in material reservoir 18, this fuel can flow into combustion through suction tube 23 and suction inlet 22 from filter by suction 24 The inside of material pump 13, the gas of the inside therefore residuing in petrolift 13 can be expressed into steaming from steam discharge hole 25 Vapour drain passageway 26.Now, even if touching fuel at the filter 28 being made up of porous body of defecator 27 And eyelet blocking thus under the state that cannot pass through of gas, this gas also can be by the company of the upper end of defecator 27 Through hole 27a and flow into the space 36b of the upper end of cover cylinder 36, and through being formed at the seam 36a of cover cylinder 36 at this The peristome 43 of upper end and be unimpededly discharged to the inner space of fuel tank T.Thus, fuel will not be residual Stay the gas in the inside of petrolift 13 to hinder, and can flow swimmingly along with the rising of the level of fuel of fuel tank T Enter the inside of petrolift 13, thus petrolift 13 can not dally to electromotor supply fuel.

If it addition, life-time service petrolift 13, then the filter by suction 24 filtering fuel can be owing to comprising in fuel Foreign body and cause eyelet to block, the steam discharge hole 25 of petrolift 13 becomes negative pressure sometimes.

Now, if the level of fuel of fuel tank T is higher than the lower end (combustion with reference to Fig. 4 of the peristome 43 of cover cylinder 36 Material height L), then by the negative pressure occurred at steam discharge hole 25, the fuel in fuel tank T is opened from cover cylinder 36 Oral area 43 is inhaled into steam discharge hole 25 by filter 28 and the steam drain passageway 26 of defecator 27, And it is supplied to electromotor from petrolift 13 together with the fuel sucked from suction inlet 22.From steam drain passageway 26 suck fuel in the filter 28 of defecator 27 by and be removed foreign body, be therefore supplied to The fuel of electromotor will not be mixed into foreign body.

On the other hand, if the level of fuel of fuel tank T is low when filter by suction 24 causes eyelet to block In the lower end (with reference to fuel height L of Fig. 4) of the peristome 43 of cover cylinder 36, then it is stored in surrounding wall 26b time initially Some fuel of inner side can be inhaled into petrolift 13 by filter 28 from steam drain passageway 26, but enclosing After level of fuel around the inner side of wall 26b arrives the lower end of filter 28, fuel is to the suction of steam drain passageway 26 Being interrupted, the gas in fuel tank T is discharged through peristome 43, filter 28, steam drain passageway 26 and steam Hole 25 and be inhaled into petrolift 13.Its result is, supplies from petrolift 13 and is mixed with gas to the fuel of electromotor Body, can be blocked the eyelet of Pilot Report's filter by suction 24 by undesirable conditions such as electromotor generation surges.

It addition, when the filter by suction 24 of petrolift 13 occurs eyelet to block, in fuel tank T In the case of fuel is sky, supply from petrolift 13 to the fuel of electromotor, also can be mixed with gas and make send out Motivation becomes undesirable condition, it is desirable to can be easily due to the eye of filter by suction 24 to this undesirable condition Hole plug and cause, or due to the fuel in fuel tank T be empty cause make a distinction.If owing to suck The eyelet blocking of filter 24 and level of fuel L when making gas be inhaled into electromotor be (lower end of peristome 43 Highly) relatively low, then it is difficult to and owing to the fuel in fuel tank T is empty to the situation causing gas to be inhaled into electromotor Make a distinction, the most preferably the lower end height of peristome 43 is set to higher as far as possible.

In No. 2014-69877 described invention of Japanese Patent Application, filter by suction generation eyelet blocking and to starting The maximum fluid of fuel during machine supply gas determines according to the height of the foot of the filter in defecator, because of This is in order to adjust the maximum fluid to fuel during electromotor supply gas, needs to be designed defecator entirety becoming More.But, defecator is combined with multiple filter and is formed as complicated shape, when it is designed change There will be the problem that die cost improves.

In contrast, according to present embodiment, maximum fluid L of the fuel when adjusting electromotor supply gas In the case of, it is not necessary to defecator 27 is designed change, only by change peristome 43 lower end height, The i.e. upper end level of the surrounding wall 26b of steam drain passageway 26, steam drain passageway 26 compares defecator It is the relatively simple parts of shape for 27, therefore, it is possible to die cost adjoint for design alteration is suppressed relatively low. If especially in the range of the seam 36a of cover cylinder 36, the most only by changing the surrounding wall 26b's of defecator 27 The height of upper end just can change the height of the lower end of peristome 43, therefore, it is possible in the situation using same cover cylinder 36 Lower adjustment gas is inhaled into the maximum fuel liquid level L of the fuel tank T of petrolift 13.

It addition, peristome 43 quilt cover cylinder 36 covers, therefore when level of fuel at the level of fuel of fuel tank T less than opening When changing under the state of the lower end of oral area 43, enter the sky in cover cylinder 36 by suppression fuel from peristome 43 Between, it is possible to gas is stably drawn into petrolift 13 from steam drain passageway 26, it is possible to reliably detect and sucked The eyelet blocking of filter 24.

This concludes the description of embodiments of the present invention, but the present invention can carried out without departing from the range of its purport Various design alterations.

Such as, in embodiments peristome 43 is formed around the upper end of wall 26b and cover cylinder 36 seam 36a it Between, but cover cylinder 36 is not necessarily required to parts, as long as peristome 43 is opened in the position higher than the lower end of filter 28 Mouth is so that the inner space of surrounding wall 26b connects with the inner space of fuel tank T.Therefore peristome 43 may not One upper end open being scheduled on surrounding wall 26b, it is also possible at the lateral opening of surrounding wall 26b.

Claims

1. a fuel supply system, it has: housing (11), and it is installed into opening of closure fuel tank (T) Oral area (Tb)；Petrolift (13), it is supported in described housing (11), will be through filter by suction (24) The fuel sucked from suction inlet (22) sprays from ejiction opening (39)；Steam discharge hole (25), it is arranged at institute State on petrolift (13), the steam produced in fuel is discharged；Steam drain passageway (26), its one end and institute State that steam discharge hole (25) connects and the other end extends to than this steam discharge hole (25) position by the top；And Defecator (27), it is connected with the other end of described steam drain passageway (26), and has mesh at outer peripheral face The filter (28) of shape, this fuel supply system is characterised by,

Described defecator (27) is surrounded when the top of described steam drain passageway (26) is provided with at top view The surrounding wall (26b) of periphery, be formed with peristome (43) in the upper end of described surrounding wall (26b) or side, should Peristome (43) is at the position opening higher than the lower end of described filter (28), and by described surrounding wall (26b) Inner space connect with the inner space of described fuel tank (T).

Fuel supply system the most according to claim 1, it is characterised in that

Described surrounding wall (26b) is integrated into the top of described steam drain passageway (26), described peristome (43) upper end of described surrounding wall (26b) it is formed on.

Fuel supply system the most according to claim 2, it is characterised in that

Described surrounding wall (26b) and described defecator (27) is covered, at described cover from top cap assembly (36) Parts (36) though the fuel that is formed in described fuel tank (T) of top for completely amount time also will not be full of by fuel Space (36b), be formed with the connection connected with described space (36b) on the top of described defecator (27) Hole (27a), is being arranged at the sidewall of described cap assembly (36) and vertically extending seam (36a) with described Between the upper end of surrounding wall (26b), it is formed with described peristome (43).