CN101418756B

CN101418756B - Fuel supply apparatus

Info

Publication number: CN101418756B
Application number: CN2008101249389A
Authority: CN
Inventors: 楠本教志; 能濑慎也; 大西善彦
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2007-10-26
Filing date: 2008-06-17
Publication date: 2011-07-20
Anticipated expiration: 2028-06-17
Also published as: DE102008017040A1; DE102008017040B4; JP4335938B2; CN101418756A; JP2009108683A

Abstract

The invention relates to a fuel supply device, which can reduce size change caused by thermal deformation and water absorption of a resin body to generate load deviation among components, can use a body made of resin, and can realize miniaturization, light weight and low cost. A disk spring (34) is compressed and arranged between the bottom of a receiving part (2) and a shell (7), and the shell (7), a valve assembly (21) and a bushing (7) arranged in the axial direction of the receiving part (2) are pressed and held among outer fittings (36) in a state of mutual contact.

Description

Fuel supplying device

Technical field

The present invention relates to the in-line arrangement fuel supplying device in a kind of fuel distribution tube that is configured between fuel tank and the fuel injection system.

Background technique

Because environmental problem such as global warming, the restriction of petrolic fuel cost and tail gas is become more and more stricter.In recent years, also the float tolerance motor of small-sized two-wheel car etc. is limited.In addition,, fuel system need be transformed into electronic control type, promptly carry out the fuel injection from mechanical type, require to realize miniaturization, lightweight and the low cost of fuel supplying device in order to realize that petrolic fuel cost descends and the purification of tail gas.

Employing such as automobile, medium-and-large-sized two-wheel vehicle be arranged on in-line arrangement fuel supplying device in the fuel tank.But under the situation of float tolerance motor, propellant capacity is little, in order to install the in-line arrangement fuel supplying device, need change the layout of fuel tank significantly.Therefore, for the fuel of realizing float tolerance motor sprays, wish to have the in-line arrangement fuel supplying device of small-sized, the light weight on a kind of pipe arrangement that is installed between fuel tank and the Fuelinjection nozzle.In addition, the in-line arrangement fuel supplying device need carry out self-priming to the fuel in the fuel tank, therefore adopts the good reciprocating pump of self-priming performance.

Axial piston pump in the past assembles as follows: the bottom that valve plate is configured in round-ended cylinder shape pump case, to partly be configured on the valve plate for the cylinder that piston inserts, with motor configurations on cylinder part, cap is inserted with in the pump case of round-ended cylinder shape with the form that is configured on the motor, and make the open end of pump case become circle, thereby finish assembling.By making motor action, the fuel that the suction connection that forms from cap sucks is discharged (for example with reference to patent documentation 1) by the discharge connecting tube that forms from the pump case bottom.

Patent documentation 1: the Japan Patent spy opens the 2001-065447 communique

In axial piston pump in the past,, then can there be the problem of discharge flow rate decline if between valve plate and the cylinder part and the sealing variation between valve plate and the pump case.In addition since between valve plate and the cylinder part and valve plate contact by intermetallic with sealing between the pump case and guarantee, so the surface pressure of regulation to be arranged.But, because axial piston pump in the past is to utilize the riveted joint of the open end of pump case to guarantee above-mentioned surface pressure, therefore need the thickness of slab of thickening pump case to improve rigidity, existence can't realize miniaturization and light-weighted problem.In addition, there is the shape restriction in the metal workpieces that thickness of slab is thicker because of processing problems, and assembly equipment is also expensive, and existence can't realize problem cheaply.

If realization miniaturization, lightweight and low-cost and use resinous pump case, then can cause dimensional changes to increase because of the suction that serviceability temperature changes after caused thermal distortion and the assembling, the load meeting that produces between each part produces deviation.Thus, can make the sealing variation between each part, produce the problem that discharge flow rate descends.

Summary of the invention

In view of the above problems, the object of the present invention is to provide and a kind ofly reduce, can use resinous body, and can realize miniaturization, lightweight and fuel supplying device cheaply because of load deviation that the thermal distortion of resin system body and the caused dimensional changes that absorbs water produce between each part.

Fuel supplying device of the present invention comprises: resinous body, and it has accommodation section that bottom tube-like is arranged, the opening side in this accommodation section forms and the discharge port that fuel sucked the inhalation port in this accommodation section and form in the bottom of this accommodation section and this fuel is discharged towards the outside; Drive portion, the axle that it has resinous exterior component, is located at the motor body portion in this exterior component and is supported in this exterior component with the form that can rotate freely and rotates under the effect of this motor body portion by bearing, the axle center that makes this is with the axial consistent of described accommodation section and this a end is stretched out in this accommodation section, be fixed on this accommodation section described exterior component is fastening, thereby seal the opening of this accommodation section; Swash plate, its end with the described axle that stretches out in described accommodation section is affixed, rotates linkedly with this rotation; Metal cylinder, it is provided in the described accommodation section, so that the hole direction of piston patchhole forms with the axial consistent form of this accommodation section; Piston, it, is provided in the described piston patchhole on described swash plate in the application of force effect lower support of spring, and slides in this piston patchhole linkedly with the rotation of this swash plate and to move; Metal housing, it is provided in the exhaust end oral-lateral of the described cylinder in the described accommodation section; Metal valve assembly, it is provided between the described cylinder and described housing in the described accommodation section, linkedly described fuel is supplied with towards described case side from described cylinder side with the action of described piston; The fuel pressure maintaining valve, it is installed in the penetration hole that is equipped with on the described housing, and when the described fuel that this case side of present dynasty is supplied with surpassed authorized pressure, this fuel pressure maintaining valve was opened, thereby this fuel is supplied with towards the exhaust end oral-lateral; Lining, it is provided in the drive portion side of the described cylinder in the described accommodation section; And elastic member, its compression is arranged between the bottom and described housing of described accommodation section, and described exterior component between will this accommodation section axially on this housing, described valve assembly, described cylinder and described lining the state pressurization clamping of arranging to contact with each other.

Adopt the present invention, the elastic member compression is arranged between the bottom and housing of accommodation section, and exterior component between will the accommodation section axially on housing, valve assembly, cylinder and lining the state pressurization clamping of arranging to contact with each other, therefore, the contour projector of elastic member can along with the thermal distortion that changes the resin system body cause because of serviceability temperature and assembling afterwards the body caused dimensional changes that absorbs water change, can guarantee the surface pressure of valve assembly.Therefore, resinous body can be used, miniaturization, lightweight and the low cost of fuel supplying device can be realized.

Description of drawings

Fig. 1 is the sectional view of structure of schematically representing the fuel supplying device of the invention process form 1.

Fig. 2 is the valve assembly major component sectional view on every side of the fuel supplying device of expression the invention process form 1.

Fig. 3 is illustrated in the load of the belleville spring of using in the fuel supplying device of the invention process form 1 and the figure of the relation between the deflection.

Fig. 4 is the sectional view of structure of schematically representing the fuel supplying device of the invention process form 2.

Fig. 5 is the sectional view of structure of schematically representing the fuel supplying device of the invention process form 3.

Fig. 6 is illustrated in the load of the body of using in the fuel supplying device of the invention process form 3 and the figure of the relation between the axial elongation amount.

Fig. 7 is illustrated in the load of the belleville spring of using in the fuel supplying device of the invention process form 3 and the figure of the relation between the deflection.

Fig. 8 is the sectional view of structure of schematically representing the fuel supplying device of the invention process form 4.

(symbol description)

1,1A, 1B body

2,2A, 2B accommodation section

The 2a cylindrical part

3 inhalation ports

4 discharge port

7 housings

8 penetration holes

9 spools (fuel pressure maintaining valve)

10 balls (fuel pressure maintaining valve)

11 springs (fuel pressure maintaining valve)

13 cylinders

14 piston patchholes

17 pistons

19 springs

21 valve assemblys

30 linings

34,50 belleville springs (elastic member)

35,35A drive portion

36 exterior components

38 motor body portions

43 bearings

47

49 swash plates

Embodiment

Example 1

Fig. 1 is the sectional view of structure of schematically representing the fuel supplying device of the invention process form 1, and Fig. 2 is the major component sectional view around the valve assembly of fuel supplying device of expression the invention process form 1.

In Fig. 1 and Fig. 2, fuel supplying device comprises: the resinous body 1 of making the round-ended cylinder shape; Be provided in the discoid housing 7 of the bottom side in the body 1; Be provided in the cylinder 13 of the body openings side of housing 7; Be clipped in the valve assembly 21 between housing 7 and the cylinder 13; Be provided in the cylindric lining 30 of the body openings side of cylinder 13; With the fastening drive portion 35 fixing and that the piston 17 that is installed on the cylinder 13 is driven of the form of the opening portion of enclosed body 1; And be clipped in belleville spring 34 between the bottom of housing 7 and body 1 as elastic member.

Body 1 for example with resin molded shapings such as nylon, comprising: inhalation port 3 that the accommodation section 2 of round-ended cylinder shape is arranged, 2 opening side forms in the accommodation section and the discharge port 4 that 2 bottom forms in the accommodation section.

Housing 7 is for example made with iron type materials has discoid with the peripheral shape of the inner peripheral surface of accommodation section 2 coupling, is equipped with penetration hole 8 on the central position.Spool 9 is pressed into the body openings side of the penetration hole 8 that remains on housing 7 with valve seat 9a towards the form of exhaust end oral-lateral, and ball 10 is setting with the valve seat 9a contact of spool 9, the form of separating, and spring 11 is provided with the form compression towards valve seat 9a pushes ball 10.At this, spool 9, ball 10 and spring 11 constitute the fuel pressure maintaining valve.

0 shape ring 32 is installed in the groove 12, and this groove 12 is provided with around circumferential whole circumference depression on the periphery wall of housing 7, thereby prevents that fuel is via between the outer circumferential face of the inner peripheral surface of accommodation section 2 and housing 7 and leak to the exhaust end oral-lateral.

Cylinder 13 is for example made cylindric with the peripheral shape of the inner peripheral surface coupling with accommodation section 2 with iron type materials, and piston patchhole 14 and filter mounting hole 15 make the direction in hole and axially as one man wearing in pairs of cylinder 13.In Fig. 1 and Fig. 2, only show a piston patchhole 14, but in fact on cylinder 13, be formed with three piston patchholes 14 on circumferential first-class angle intervals ground.In addition, be formed with three filter mounting holes 15 accordingly with piston patchhole 14.

Filter 16 is installed in each filter mounting hole 15, and piston 17 is installed in each piston patchhole 14 with the form that can slide vertically.Be installed in spring 19 on the spring seat 18 and engage with ring 20 on being installed in piston 17 and be installed on the piston 17 with sheathed state, and towards the body openings side to piston 17 application of forces.

Valve assembly 21 is for example made discoid with iron type materials, comprising: be equipped with the base portion 22 of access 23 and with first valve plate 24 and second valve plate 26 of the form configuration of clamping base portion 22 on the position relative with piston patchhole 14.On the body openings side surface of base portion 22 so that the form that access 23 is communicated with filter mounting hole 15 is concaved with first connecting path 28.On the surface of the body openings side of housing 7 so that the form that access 23 is communicated with penetration hole 8 is concaved with second connecting path 29.

First valve plate 24 is for example made lamellar around first connecting path 28 with the austenitic stainless steel material, with surface contact state by base portion 22 and cylinder 13 clampings, thereby prevent that fuel from leaking to outside diameter from first connecting path 28.First valve plate 24 has suction valve 25, this suction valve 25 according to the pressure difference between first connecting path 28 and the filter mounting hole 15 and with the surface contact of the exhaust end oral-lateral of cylinder 13, separate, thereby to opening and closing between first connecting path 28 and the filter mounting hole 15.

Second valve plate 26 is for example made lamellar around second connecting path 29 with the austenitic stainless steel material, with surface contact state by 7 clampings of base portion 22 housings, thereby prevent that fuel from leaking to outside diameter from second connecting path 29.Second valve plate 26 has expulsion valve 27, this expulsion valve 27 according to the pressure difference between second connecting path 29 and the access 23 and with the surface contact of the exhaust end oral-lateral of base portion 22, separate, thereby to opening and closing between second connecting path 29 and the access 23.

Lining 30 is for example made the drum that has with the peripheral shape of the inner peripheral surface of accommodation section 2 coupling with iron type materials, on lining 30 so that the form of inhalation port 3 and lining 30 internal communication is formed with access 31.Belleville spring 34 usefulness elastic materials are made the cone shape cylinder of decaptitating of the axial length with regulation, between the surface with the exhaust end oral-lateral of the inner bottom surface of the accommodation section 2 that is clamped in body 1 around the penetration hole 8 of housing 7 and the form of discharging the opening of port 4 and housing 7.

Drive portion 35 comprises: the exterior component 36 made of resin such as nylon for example; Be arranged on the motor body 38 in the exterior component 36; And by bearing 43 can support in the piece installing outside 36 with rotating freely, effect by this motor body 38 is rotated axle 47.Exterior component 36 utilizes screw 48 fastening fixing after the lip part 5 of lip part 37 and body 2 is crashed, with the closure of openings of the accommodation section 2 of body 2.At this moment, O shape ring 33 is installed in the groove 6, and this groove 6 is provided with around circumferential whole circumference depression on the opening side end face of body 1, thereby prevents that fuel is via between body 1 and the exterior component 36 and leak to outside diameter.

Motor body 38 comprises: with a pair of stator 39 of exterior component 36 integrally moulded formation and be fixed on rotor 44 on the axle 47.Stator 39 comprises: coil 40 that is formed by Wire-wound and the aerial lug 42 with the bonder terminal 41 that is connected with this coil 40.Rotor 44 has: be fixed on lining 45 and the sheathed permanent magnet 46 that is fixed on the drum on this lining 45 on the axle 47.Swash plate 49 is fixed on the external part of axle 47 exhaust end oral-lateral, the application of force effect of piston 17 by spring 19 and the surperficial butt of the exhaust end oral-lateral of swash plate 49.

When the fuel supplying device of this structure of assembling, at first belleville spring 34 is configured on the inner bottom surface of accommodation section 2 of body 1, and housing 7 is pressed in the accommodation section 2.Then, valve assembly 21 is inserted accommodation section 2 with the form that is positioned on the housing 7, cylinder 13 is inserted accommodation section 2 with the form that is positioned on the valve assembly 21, and lining 30 is inserted in the accommodation section 2.Then, the lip part 37 of the exterior component 36 that is incorporated with axle 47, rotor 44 and swash plate 49 and the lip part 5 of body 1 are crashed, and utilize screw 48 to make exterior component 36 fastening fixing with body 1.

Action to fuel supplying device describes below.

Though not shown, fuel supplying device is configured in the pipe arrangement way between fuel tank and the Fuelinjection nozzle.At this moment, inhalation port 3 is connected with the fuel tank side, discharges port 4 and is connected with the Fuelinjection nozzle side.Then, by 42 pairs of coils of aerial lug 40 power supply, axle 47 is driven by motor body 38 and rotates, and makes swash plate 49 rotations.

Then, under the application of force effect of the rotation of swash plate 49 and spring 19, piston 17 moves back and forth in piston patchhole 14 in the axial direction.Move in the inhalation process on Fig. 1 right side at piston 17, along with moving of piston 17, the pressure in first connecting path 28 and the access 23 descends.Thus, the pressure in first connecting path 28 and the access 23 become and are lower than pressure in second connecting path 29 and the filter mounting hole 15, and expulsion valve 27 is close to the exhaust end oral-lateral surface of base portion 22, and suction valve 26 leaves from the exhaust end oral-lateral surface of cylinder 13.That is, expulsion valve 27 cuts out, and suction valve 26 is opened, and the fuel that flows in the accommodation section 2 from inhalation port 3 is inhaled in the piston patchhole 14 via first connecting path 28 from filter mounting hole 15.At this moment, the impurity in the fuel is filtered device 16 and removes.

Then, move in the discharge operation in Fig. 1 left side at piston 17, along with moving of piston 17, the pressure in first connecting path 28 and the access 23 rises.Thus, the pressure in first connecting path 28 and the access 23 become and are higher than pressure in second connecting path 29 and the filter mounting hole 15, and expulsion valve 27 leaves from the exhaust end oral-lateral surface of base portion 22, and suction valve 26 is close to the exhaust end oral-lateral surface of cylinder 13.That is, expulsion valve 27 is opened, and suction valve 26 cuts out, and the fuel in the piston patchhole 14 is discharged in second connecting path 29 via first connecting path 28 and access 23.

Then, when the pressure of the fuel in being introduced into second communication paths 29 became greater than the application of force of spring 11, ball 10 left from valve seat 9a.Thus, the fuel of the fuel pressure that is set by the application of force of spring 11 is discharged to discharging port 4 from second connecting path 29, supplies with to Fuelinjection nozzle.

Because what this fuel supplying device used is resinous body 1, therefore, body 1 produces dimensional changes because of the variation thermal distortion of serviceability temperature or because of assembling the back suction, and accommodation section 2 is extended in the axial direction.In this example 1, belleville spring 34 compresses between the bottom surface and housing 7 of the accommodation section 2 that is arranged on body 1, and therefore, when extended in the axial direction accommodation section 2, the contour projector of belleville spring 34 diminished.That is, belleville spring 34 recoveries of contraction and the corresponding length of axial elongation amount of accommodation section 2.Thus, the surface pressure and the surface pressure between second valve plate 26 and the housing 7 that can suppress between surface pressure, second valve plate 26 and the base portion 22 between surface pressure, first valve plate 24 and the cylinder 13 between first valve plate 24 and the base portion 22 descends.Like this, even if use resinous body 1, also can guarantee the sealed department between sealed department, second valve plate 26 and the base portion 22 between sealed department, first valve plate 24 and the cylinder 13 between first valve plate 24 and the base portion 22 and the surface pressure of the sealed department between second valve plate 26 and the housing 7, keep the sealing of these sealed departments, and suppress the decline of discharge flow rate.Therefore, resinous body 1 can be used, miniaturization, lightweight and fuel supplying device cheaply can be realized.

Belleville spring 32, housing 7, valve assembly 21, cylinder 13 and lining 30 are accommodated in the accommodation section 2 of body 1 in the axial direction overlappingly, drive portion 35 is by being installed on the body 1 from axial foreign side fastening screw trip bolt 48, therefore, constituent part only is an axial side to the installation direction of body 1, can improve the assembling of fuel supplying device.

Study the surface pressure of the sealed department of valve assembly 21 below.At this, with the sealed department of the sealed department between the sealed department between the sealed department between the sealed department between first valve plate 24 and the base portion 22, first valve plate 24 and the cylinder 13, second valve plate 26 and the base portion 22 and second valve plate 26 and the housing 7 as valve assembly 21.Have the constituent part of influence as surface pressure, body 1, lining 30, cylinder 13, valve assembly 21, housing 7 etc. are for example arranged valve assembly 21 sealed departments.

As shown in Figure 3, belleville spring 34 has following spring performance, and promptly till loading to 1500N, deflection roughly is directly proportional with load, and when load surpassed 1500N, the deflection quantitative change was big.And when load surpassed 1800N, deflection became greatly, then is deformed into planar, and deflection becomes zero.That is, the spring performance of belleville spring 34 disappears.Therefore, the maximum working load of belleville spring 34 is 1800N.

If will guarantee that the required loading range of sealing of these valve assembly 21 sealed departments for example is made as 800N～1800N, then as shown in Figure 3, the deflection of belleville spring 34 is 0.2mm～0.7mm.Therefore, making the deflection of belleville spring 34 become 0.2mm～0.7mm being dimensioned to of constituent part on the basis of the size deviation of the constituent part of need when considering assembling gets final product.

The surface pressure of the sealed department of the valve assembly 21 after the thermal distortion of constituent part took in when research was to temperature variation is below guaranteed.

If the bottom surface of accommodation section 2 and the axially spaced-apart between the exterior component 36 are made as A, the axial length of lining 30 is made as B, the axial length of cylinder 13 is made as C, the axial length of valve assembly 21 is made as D, the axial length of housing 7 is made as E, the preseting length of belleville spring 34 is made as F, then satisfies formula (1).

A=B+C+D+E+F ... formula (1)

Therefore, if satisfy formula (2), even then constituent part produces thermal distortion along with temperature variation, but the also surface pressure of check valve assembly 21 sealed departments change.

Wherein, Δ A is the variable quantity of the body 1 that causes because of temperature variation, Δ B is the variable quantity of the axial length of the lining 30 that causes because of temperature variation, Δ C is the variable quantity of the axial length of the cylinder 13 that causes because of temperature variation, Δ D is the variable quantity of the axial length of the valve assembly 21 that causes because of temperature variation, and Δ E is the variable quantity of the axial length of the housing 7 that causes because of temperature variation.

At this, body 1 is a resin system, and the base portion 22 of lining 30, cylinder 13, valve assembly 21 and housing 7 are metallic.

Thermal expansion coefficient as the nylon monomer of the material of body 1 is 85.0 * 10 ^-6(/T).And contain the nylon of 15 weight % glass fibres, the thermal expansion coefficient that contains the nylon of 30 weight % glass fibres is respectively 35.0 * 10 ^-6(/T) and 17.5 * 10 ^-6(/T).That is, can by adjust glass fibre with respect to the content of nylon adjust body 1 thermal expansion coefficient, be the variable quantity on formula (2) left side.

On the other hand, the thermal expansion coefficient as iron type materials, austenitic stainless steel and the aluminium of metallic material is respectively 11.0 * 10 ^-6(/T), 17.3 * 10 ^-6(/T), 24.0 * 10 ^-6(/T).Because therefore first valve plate 24 and second valve plate, 26 elasticity of demand of valve assembly 21 use the austenitic stainless steel material.In order to suppress the variable quantity that causes because of temperature variation on formula (2) left side and the right, need make at least one the thermal expansion coefficient in the thermal expansion coefficient of the right part greater than left side part.In this case, if lining 30, cylinder 13, base portion 22 and housing 7 are all made of iron type materials, then the variable quantity on formula (2) the right diminishes, and the glass fibre that need make the left side becomes excessive with respect to the content of nylon.

Therefore, in axial length long lining 30, cylinder 13 and the housing 7 at least one made by the aluminium of thermal expansion coefficient maximum in the above-mentioned metallic material, thereby can increase the variable quantity on formula (2) the right, can enlarge the adjustment range of the glass fibre on the left side with respect to the content of nylon, even during the thermal distortion of the constituent part that has produced having taken place to follow temperature variation, also can guarantee the surface pressure of the sealed department of valve assembly 21.

At this, for the employed body 1 of fuel supplying device, glass fibre about 15%～35% is being suitable roughly generally with respect to the content of nylon, if 15% with next intensity variation, if in deterioration of impact resistance then more than 35%.In this case, the setting range of the thermal expansion coefficient of body 1 is roughly 15.0 * 10 ^-6(/T) be above, 35.0 * 10 ^-6Below the (/T), owing to be in the above-mentioned example 1 by using aluminium to adjust the variable quantity on formula (2) the right, therefore the thermal expansion coefficient of body 1 need being set at below the thermal expansion coefficient of aluminium.Therefore, preferably the content of glass fibre is adjusted to and makes the thermal expansion coefficient of body 1 become 15.0 * 10 ^-6(/T) be above, 20.0 * 10 ^-6Below the (/T).

In above-mentioned example 1, the resin material of body 1 is a nylon, but body 1 is not limited to nylon, for example can use PPS engineering plastics such as (poly-p-phenylene sulfides).Be the thermal expansion coefficient of adjusting body 1 by the content of adjusting glass fibre in the above-mentioned example, but the material that the thermal expansion coefficient of body 1 is adjusted is not limited to glass fibre, for example also fiber such as available carbon fiber is adjusted.

Example 2

In Fig. 4, belleville spring 50 comprises: the cone shape cylinder 50a that decaptitates, first 50b of eaves portion that extends from the path side end of cylinder 50 towards internal side diameter and second 50c of eaves portion that extends towards outside diameter from the big footpath side end of cylinder 50a, and between the exhaust end oral-lateral surface with the inner bottom surface of the accommodation section 2 that is sandwiched in body 1 around the penetration hole 8 of housing 7 and the form of discharging the opening of port 4 and housing 7.

Except replacing the belleville spring 34 with belleville spring 50, this example 2 similarly constitutes with above-mentioned example 1.

Adopt this example 2, first 50b of eaves portion is face with the ring-type of surrounding penetration hole 8 with the exhaust end oral-lateral surface of housing 7 and contacts, second 50c of eaves portion is face with the ring-type of the opening of surround discharging port 4 with the inner bottom surface of accommodation section 2 and contacts, and therefore, belleville spring 50 plays a role as sealed member.Thus, the low-pressure fuel of the fuel under high pressure of belleville spring 50 internal side diameters and belleville spring 50 outside diameters is isolated, and can save the O shape ring 32 as sealed member.

Example 3

In Fig. 5, body 1A is formed with cylindrical part 2a, and this cylindrical part 2a will have the axial part of perisporium of the accommodation section 2A of round-ended cylinder shape to make thin-walled on the whole circumference direction.

Except replacing the body 1 with body 1A, this example 3 similarly constitutes with above-mentioned example 1.

At this, the solid line among Fig. 6 is represented is the relation that acts between the axial elongation amount of tension load on the accommodation section 2A of body 1A and accommodation section 2A.Dotted line among Fig. 6 is represented is the relation that acts between the axial elongation amount of tension load on the accommodation section 2 of body 1 and accommodation section 2.

As shown in Figure 6, the axial elongation amount of the accommodation section 2 of

body

1,1A, 2A increases with tension load with being directly proportional.In addition, because the accommodation section 2A of body 1A is formed with the cylindrical part 2a of thin-walled, therefore compare easy elongation with accommodation section 2.

What Fig. 7 represented is the deflection of belleville spring and the relation between the load.Among Fig. 7, solid line is represented is the deflection of belleville spring of fuel supplying device of example 3 and the relation between the load, and dotted line is represented is the deflection of belleville spring of fuel supplying device of example 1 and the relation between the load.The deflection of the belleville spring when among Fig. 7 being the minimum value (800N) of necessary loading range with load in addition, is made as zero.

As shown in Figure 7, in the fuel supplying device of example 1, load is big with respect to the slope of deflection.Therefore, during assembling in order to ensure in the necessary loading range of loading on of belleville spring 34, the size deviation that need dwindle constituent part.In addition, consider the dimensional changes that assembling back body 1 causes because of suction, in the necessary loading range of loading on of belleville spring 34, need further dwindle the size deviation of constituent part.

As shown in Figure 7, in the fuel supplying device of this example 3, load is little with respect to the slope of deflection.This is because be provided with the cylindrical part 2a of thin-walled on the 2A of the accommodation section of body 1A, thereby increased the axial elongation amount with respect to load of body 1A.Therefore, even enlarge the tolerance of the size deviation of constituent part, also can guarantee in the necessary loading range of loading on of belleville spring 34.In addition, even the body 1A after the assembling has produced dimensional changes because of suction, also can guarantee in the necessary loading range of loading on of belleville spring 34.

Like this, adopt this example 3, on the 2A of the accommodation section of body 1A, be provided with the cylindrical part 2a of thin-walled, increased the axial elongation amount of body 1A with respect to load, therefore, but the using scope of belleville spring 34 can be enlarged, but the surplus of the using scope of belleville spring 34 can be guaranteed.

Example 4

In Fig. 8, body 1B comprises: the accommodation section 2B of round-ended cylinder shape and the discharge port 4 that forms in the bottom of accommodation section 2B are arranged.Drive portion 35A so that the axially consistent form of inhalation port 3 with spools 47 axis direction be formed on the exterior component 36.

Other structure and above-mentioned example 1 similarly constitute.

In the fuel supplying device of this example 4, the axle center of body 1B is a vertical, and drive portion 35A is configured to be positioned at respect to body 1B the top of vertical.

Therefore, fuel is introduced in the inhalation port 3 via pipe arrangement from fuel tank, and is inhaled in the 2B of accommodation section behind the gap of flowing through between bearing 43 and rotor 44 and the stator 39.At this moment, the fuel from the low temperature of fuel tank cools off motor body 38.

Fuel is heated in the inside of accommodation section 2B and the inside of drive portion 35A, produces steam.This steam moves towards the vertical top, and turns back to the fuel tank side from inhalation port 3.Thus, can suppress in the 2B of accommodation section and the rising of the temperature of the fuel in the drive portion 35A.

Adopt this example 4, can improve the cooling performance of motor body 38, and suppress in the 2B of accommodation section and the rising of the temperature of the fuel in the drive portion 35A, therefore, the temperature that can suppress body 1B rises, and the water absorption rate that suppresses in the body 1B rises.Consequently, the dimensional changes of the body 1B that causes because of suction reduces, and can suppress the sealing variation of valve assembly 21 sealed departments that the dimensional changes because of body 1B causes.

Claims

1. a fuel supplying device is characterized in that, comprising:

The discharge port that resinous body, this body have accommodation section that bottom tube-like is arranged, the opening side in this accommodation section forms and fuel sucked the inhalation port in this accommodation section and form in the bottom of this accommodation section and described fuel is discharged towards the outside;

Drive portion, the axle that this drive portion has resinous exterior component, be located at the motor body portion in this exterior component and be supported in the described exterior component with the form that can rotate freely and rotate under the effect of described motor body portion by bearing, the axle center that makes this is with the axial consistent of described accommodation section and this a end is stretched out in this accommodation section, be fixed on this accommodation section described exterior component is fastening, thereby seal the opening of this accommodation section;

Swash plate, this swash plate is affixed with an end of the described axle that stretches out in described accommodation section, rotates linkedly with this rotation;

Metal cylinder, this cylinder is provided in the described accommodation section, so that the hole direction of piston patchhole forms with the axial consistent form of this accommodation section;

Piston, this piston, and slide in described piston patchhole linkedly with the rotation of described swash plate and to move on described swash plate and be provided in the described piston patchhole in the application of force effect lower support of spring;

Metal housing, this housing are provided in the exhaust end oral-lateral of the described cylinder in the described accommodation section;

Metal valve assembly, this valve assembly are provided between the described cylinder and described housing in the described accommodation section, linkedly described fuel are supplied with towards described case side from described cylinder side with the action of described piston;

The fuel pressure maintaining valve, this fuel pressure maintaining valve is installed in the penetration hole that wears on described housing, when the described fuel that the described case side of present dynasty is supplied with surpassed authorized pressure, described fuel pressure maintaining valve was opened, thereby described fuel is supplied with towards the exhaust end oral-lateral;

Lining, this lining are provided in the drive portion side of the described cylinder in the described accommodation section; And

Elastic member, the compression of this elastic member is arranged between the bottom and described housing of described accommodation section, and and described exterior component between will described accommodation section axially on described housing, described valve assembly, described cylinder and the described lining arranged with the state that the contacts with each other clamping of pressurizeing.

2. fuel supplying device as claimed in claim 1 is characterized in that, the axial part of the perisporium of described accommodation section forms thin-walled on whole circumference.

3. fuel supplying device as claimed in claim 1 or 2 is characterized in that, described elastic member is a belleville spring.

4. fuel supplying device as claimed in claim 3, it is characterized in that, described belleville spring is made into following state: be face with the bottom of described accommodation section in the form of a ring with the form around the opening of described discharge port and contact, and be face with described housing in the form of a ring with the form that centers on described penetration hole and contact.

5. fuel supplying device as claimed in claim 1 or 2 is characterized in that, the thermal expansion coefficient of described body is less than in the thermal expansion coefficient of described housing, described cylinder and described lining at least one.

6. fuel supplying device as claimed in claim 1 or 2 is characterized in that, at least one in described housing, described cylinder and the described lining made with aluminium.

7. fuel supplying device as claimed in claim 1 or 2 is characterized in that, the resin that described body and function contains glass fibre is made.

8. fuel supplying device as claimed in claim 7 is characterized in that, the thermal expansion coefficient of described body is 15.0 * 10 ^-6(/T) be above, 20.0 * 10 ^-6Below the (/T).

9. a fuel supplying device is characterized in that, comprising:

The discharge port that resinous body, this body have accommodation section that bottom tube-like is arranged and form in the bottom of this accommodation section and fuel is discharged towards the outside;

Drive portion, this drive portion has resinous exterior component, be located at motor body portion in this exterior component, be supported in the described exterior component with the form that can rotate freely and axle that rotates under the effect of described motor body portion and the inhalation port that forms on described exterior component by bearing, the axle center that makes described axle is with the axial consistent of described accommodation section and this a end is stretched out in this accommodation section, be fixed on this accommodation section described exterior component is fastening, thereby seal the opening of this accommodation section;

Piston, this piston, is provided in the described piston patchhole on described swash plate in the application of force effect lower support of spring, and slides in described piston patchhole linkedly with the rotation of described swash plate and to move;

10. fuel supplying device as claimed in claim 9 is characterized in that, the axial part of the perisporium of described accommodation section forms thin-walled on whole circumference.

11., it is characterized in that described elastic member is a belleville spring as claim 9 or 10 described fuel supplying devices.

12. fuel supplying device as claimed in claim 11, it is characterized in that, described belleville spring is made into following state: be face with the bottom of described accommodation section in the form of a ring with the form around the opening of described discharge port and contact, and be face with described housing in the form of a ring with the form that centers on described penetration hole and contact.

13., it is characterized in that the thermal expansion coefficient of described body is less than in the thermal expansion coefficient of described housing, described cylinder and described lining at least one as claim 9 or 10 described fuel supplying devices.

14., it is characterized in that at least one in described housing, described cylinder and the described lining made with aluminium as claim 9 or 10 described fuel supplying devices.

15., it is characterized in that the resin that described body and function contains glass fibre is made as claim 9 or 10 described fuel supplying devices.

16. fuel supplying device as claimed in claim 15 is characterized in that, the thermal expansion coefficient of described body is 15.0 * 10 ^-6(/T) be above, 20.0 * 10 ^-6Below the (/T).