CN102052216B

CN102052216B - Fuel supply device

Info

Publication number: CN102052216B
Application number: CN 201010219827
Authority: CN
Inventors: 瓜生拓也; 大西善彦
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2009-10-26
Filing date: 2010-06-23
Publication date: 2013-10-16
Anticipated expiration: 2030-06-23
Also published as: DE102010023853B4; JP2011089501A; CN102052216A; DE102010023853A1; JP4896201B2

Abstract

The invention provides a fuel supply device capable of improving the lubricity of the bearing of a motor, which has a stable fuel pressure and high reliability.According to the device, a pump part (2B) is driven by a motor part (2A).The inhaled fuel is pressurized and then is discharged by the pump part (2B).The motor part (2A) comprises a stator (9), a rotor (10) arranged opposite to the stator (9), a bottomed cylindrical partition body (17) separating the stator (9) from the rotor (10) and a bearing (20). The stator (9) is equipped with a support (6), an iron core (8) and a coil wound on the iron core (7). The rotor (10) rotates relative to a shaft (11).The partition body (17) communicates with the pump part (2B) and is filled with fuel. The bearing (20) arranged at the bottom of the partition body (17) supports one end of the shaft (11) of the rotor (10). The rotor (10) is equipped with a plurality of fuel path (14) penetrating the rotor (10) parallel to the shaft (11).

Description

Fuel supplying device

Technical field

The present invention relates to a kind of fuel supplying device of fuel injection system feed fuels of for example combustion motor.

Background technique

About fuel supplying device, in the disclosed fuel supplying device, stator and control gear have been accommodated in bottom shell body in the patent documentation 1, at the inner peripheral surface that is disposed at the bearing of section in the housing a plurality of recesses are set, and with this path that acts as a fuel.

In addition, although be not fuel supplying device, but for example disclose the electric water pump that adopts following structure in patent documentation 2, have the partition body that cuts off fluid and stator, the fluid supply passage that will be lubricated for the bearing to the impeller opposition side that is disposed at section in the partition body is located at rotor magnet.

Patent documentation 1: No. 3402330 communique of Japanese Patent Laid

Patent documentation 2: Japanese Patent Laid-Open 2000-213490 communique

In the fuel supplying device of patent documentation 1, since as being recessed in of stream bearing inner surface with slip surface axle on be formed at vertically many places, therefore, in order to ensure the meticulous processing of precision needs of bearing, cause the increase of processing cost and the leakproofness that needs increase the accuracy control of part.In addition, because the slip surface of bearing and axle becomes discontinuous because of depression, the such problem of reason of the vibration of the rotor when therefore also existence easily becomes rotation and the generation of extraordinary noise.

In addition, in the electric water pump of patent documentation 2, because with the angle setting of fluid supply passage with respect to rotor shaft direction inclination regulation, therefore existing needs to process towards the hole that magnet tilts, the problem that causes processing cost to increase.

Summary of the invention

The present invention does for solving the problems of the technologies described above, its purpose is to provide a kind of fuel supplying device, this fuel supplying device can not form because of the fuel passage that bearing lubrication is used and cause cost to increase, can improve the greasy property of bearing, realize the reduction that bearing wear, temperature rise, improve the reliability of bearing.

In the fuel supplying device involved in the present invention, the rotation by motor part comes driven pump section, and the fuel that sucks is pressurizeed in pump section and with its discharge, wherein, motor part comprises: stator, and it is made of support, iron core and the coil that is wound in iron core; Rotor, it is relative with said stator, rotates centered by axle; The partition body that bottomless drum shape is arranged, it separates stator and rotor, and is communicated with pump section, and inside is full of fuel; And bearing, it is located at the bottom of aforementioned barriers body, and an end of the axle of supporting rotor, rotor are provided with a plurality of fuel passage that run through abreast rotor with axle.

According to the present invention, can not cause cost to increase, and can prevent the wearing and tearing of bearing of motor of fuel supplying device and overheated.In addition, owing to can reduce the slip loss of bearing, therefore can suppress the consumes power of motor, moreover, rise owing to can suppress the temperature of fuel, therefore can reduce the steam because of the gasification generation of fuel, the vapour locking of pump be can avoid, the stability of combustion pressure and the reliability of fuel supplying device improved.In addition, because the bearing of motor is carried out enough lubricating, therefore, even if fuel supplying device tilts with respect to substantially horizontal, can not cause obstruction to the rotation of motor yet.Therefore, can increase the degrees of freedom of the installing posture of fuel supplying device.

Description of drawings

Fig. 1 is the structural drawing of general fuel system.

Fig. 2 is the sectional view of the fuel supplying device of expression embodiment of the present invention 1.

Fig. 3 is the figure of rotor of the fuel supplying device of expression mode of execution 1, Fig. 3 (a) is sectional view, Fig. 3 (b) is the sectional view from the cross section of the A-A line of direction of arrow observation Fig. 3 (a), and Fig. 3 (c) is the plan view of observing Fig. 3 (a) from the arrow B direction.

Fig. 4 is the chart of measurement result of the bearing temperature of expression mode of execution 1.

Fig. 5 is the figure of rotor of the fuel supplying device of expression embodiment of the present invention 2, and Fig. 5 (a) is the plan view of the part of expression rotor, and Fig. 5 (b) is the sectional view in cross section of observing the D-D line of Fig. 5 (a) from the direction of arrow.

Fig. 6 is the figure of rotor of the fuel supplying device of expression embodiment of the present invention 3, Fig. 6 (a) is sectional view, Fig. 6 (b) is the sectional view from the cross section of the C-C line of direction of arrow observation Fig. 6 (a), and Fig. 6 (c) is the plan view of observing Fig. 6 (a) from arrow D direction.

Fig. 7 is the figure of rotor of the fuel supplying device of expression embodiment of the present invention 4, Fig. 7 (a) is sectional view, Fig. 7 (b) is the sectional view from the cross section of the E-E line of direction of arrow observation Fig. 7 (a), and Fig. 7 (c) is the plan view of observing Fig. 7 (a) from arrow F direction.

(symbol description)

1 fuel tank, 2 fuel supplying devices, the 2A motor part, 2B pump section, 3 pressure regulation devices, 4 fuel injection systems, 5 control units, 6 supports, 7 stator cores, 8 stator coils, 9 stators, 10 rotors, 11 axles, 12 magnets, the 12a plastic magnet, 13 non magnetic supporting masses, 14 fuel passage, 15 steering channels, 16 plane of inclination, 17 partition bodies, 18 flanges, 19 sealing components, 20 clutch shaft bearings, 21 second bearings, 22 openings, 23 shells, 24 suction valves, 25 expulsion valves, 26 plates, 27 pistons, 28 cylinders, 29 springs, 30 pumping chambers, 31 inhalation ports, 32 discharge port

Embodiment

Mode of execution 1

Fig. 1 is the structural drawing of the fuel system used in the fuel supplying device of the present invention.By the drive fuel supplying device 2 from control unit 5, fuel supplying device 2 is from fuel tank 1 via filter suction fuel and with its discharge.The fuel of discharging is adjusted to authorized pressure by pressure regulation device 3, and supplies to fuel injection system 4 via the fuel under high pressure pipe arrangement.Fuel injection system 4 is according to the rotating speed of motor and load etc., and by the driving signal from control unit 5, control discharge time and emitted dose inject fuel into sucking pipe.

Fig. 2 is the sectional view of the structure of expression fuel supplying device 2, and fuel supplying device 2 is made of motor part 2A and the 2B of pump section.Motor part 2A has stator 9, and this stator 9 is by consisting of along the stator core 7 that configures in interior week of support 6 and a plurality of stator coils 8 that are wound in this stator core 7.Stator 9 is according to the driving signal from control unit 5, and converted magnetic pole under the effect of stator coil 8 produces rotating magnetic field.

The internal configurations of stator 9 has rotor 10.Rotor 10 comprises axle 11 and the magnet 12 of rotation centered by this axle 11.Fig. 3 is the figure of the concrete structure of expression rotor 10.Magnet 12 forms ring-type, and periphery is magnetized to a plurality of magnetic poles.

Magnet 12 is for example by the inserts ester moulding, and the non magnetic supporting mass 13 that utilizes resin to form is fixed in axle 11.Part at the outer circumferential face of axle 11 is formed with not shown annular knurl or H shape grooving etc., by shaping resin being flowed into this position, according to the spline that engages (anchor) effect and realize axle 11 and non magnetic supporting mass 13.Non magnetic supporting mass 13 between magnet 12 and the axle 11 roughly is the drum shape, interior week and the both ends of the surface of supporting magnet 12.In non magnetic supporting mass 13, the fuel passage 14 that runs through abreast with axle 11 arranges many places, for example is located at the periphery with rotor 10 is become on the position that concentrically ringed circumference uniformly-spaced cuts apart.The sectional shape of fuel passage 14 is not limited to circle, also can be slotted hole, ellipse and semilune.In a side of non magnetic supporting mass 13, be the end outer surface of the 2B of pump section side, as the fan axle position, the roughly fan-shaped steering channel 15 that is communicated with fuel passage 14 is towards the periphery formation of rotor 10 with fuel passage 14.In addition, be formed with plane of inclination 16 towards the taper of rotor periphery in the end outer surface that is provided with steering channel 15.The main cause of a plurality of fuel passage 14 and steering channel 15 vibration when thereby the first-class arranged spaced of circumference can not become rotor.

Between stator 9 and rotor 10, there is the partition body 17 of round-ended cylinder shape to be configured in the interior week of stator core 7.Side at partition body 17 is formed with flange 18, disposes sealing component 19 in the periphery of flange 18, in the can 23 and the fuel in the partition body 17.Flange 18 is clamped by motor part 2A and the pump 2B of section described later, stationary barrier body 17 self.Partition body 17 is shaped by in-mould injection, is made of the nonmagnetic substance of similar resin.Rotor 10 is housed in the inside of partition body 17 with rotating freely.

One end of the axle 11 of rotor 10 is configured in clutch shaft bearing 20 supportings of the bottom (inner section) of partition body 17.When being shaped formation partition body 17 by in-mould injection, also can forming clutch shaft bearing 20 by insert part forming, or behind in-mould injection, clutch shaft bearing 20 be inserted partition bodies 17.The other end of axle 11 is fixed in the second bearing 21 supportings of flange 18 sides of partition body 17.In the drawings, the second bearing 21 is the sliding bearings with penetration hole, also can be rolling bearing.In the second bearing 21, be provided with the opening 22 that is communicated with the pump 2B of section and rotor 10 sides.The end that is provided with steering channel 15 of rotor 10 is configured near the second bearing 21 sides.

Then, the 2B of pump section is described.The 2B of pump section has the shell 23 that flange 18 and motor part 2A by partition body 17 are combined airtightly.Shell 23 comprises the suction valve 24 that links to each other with fuel tank 1 and the expulsion valve 25 that links to each other with fuel injection system 4.The piston 27 that in shell 23, is provided with the axle head that is fixed in axle 11 and the plate that is rotated 26, is driven by plate 26 and cylinder 28, to spring 29 of piston 27 application of forces etc.

The angle that plate 26 tilts regulation is fixed in the front end of axle 11, and rotates along with the rotation of axle 11.The head of piston 27 contacts with the plane of inclination of plate 26, because the rotation of plate 26, piston 27 is interior back and forth at cylinder 28, flows into fuel in the shells 23 from inhalation port 31 and is sent to pumping chambers' 30 pressurizations in the cylinder 28, and gone out by force feed from discharging port 32 by expulsion valve 25.Partly be full of fuel with the accommodating of rotor 10 of the partition body 17 that links to each other with shell 23 by opening 22 in the shell 23.

When the fuel supplying device 2 of said structure turns round, rotation along with rotor 10, near the end face of rotor 10 fuel along the end face of rotor 10 towards the periphery side flow, by the gap between rotor 10 and the partition body 17, supplies to clutch shaft bearing 20 sides of 17 li sections of partition body under the effect of centrifugal force.The fuel that flows to clutch shaft bearing 20 sides is got back to the side of rotor 10 again through the fuel passage 14 of being located at non magnetic supporting mass 13, form circulating of fuel.

At this moment, because the width of steering channel 15 fan opens arrival rotor peripheral part take the position that is communicated with fuel passage 14 as starting point towards the peripheral direction of rotor 10, relative with the internal face of partition body 17, therefore, fuel easily flows along steering channel 15 towards the rotor peripheral direction, the pressure drop of fuel passage 14 sides, easily make fuel flow into fuel passage 14, the fuel of discharging from steering channel 15 along the inwall of partition body 17 flow into partition body 17 in section, by this, can improve the cycle efficiency of fuel.In addition, owing to being provided with plane of inclination 16 in the end of rotor 10, therefore, 16 fuel that flow easily flow into the gap of rotor 10 and partition body 17 along the plane of inclination.

As mentioned above, because to the clutch shaft bearing 20 of section in the partition body 17 feed fuels constantly, be lubricated and cool off, the temperature that therefore can suppress bearing 20 parts rises, and can suppress by this rising of fuel temperature.Consequently, can reduce the bearing wear that causes owing to lack of lubrication, the increase of the sliding torque of wearing and tearing is followed in inhibition, and can suppress the increase of the consumes power of motor.In addition, can suppress the sintering of bearing, improve the reliability of fuel supplying device.

Fig. 4 be expression with respect to elapsed time, adopt the actual measurement chart of temperature of the bearing of structure of the present invention, the longitudinal axis represents bearing temperature, transverse axis represents the transit time.Among the figure, dot and dash line is illustrated in fuel passage 14 is not set in the rotor 10, and solid line represents to adopt structure of the present invention.Can confirm to obtain roughly 19 ℃ temperature decreasing effect by the circulating path that fuel is set.

The effect that circulates that acts as a fuel owing to suppressing because the heat of the inside of the partition body 17 that the heat that motor produces causes does not circulate, can suppress the rising of fuel temperature of the inboard volume of partition body 17, reduces the steam owing to the fuel gasification generation.Consequently, steam is difficult for the 2B of inflow pump section, can suppress the so-called vapour locking of petrolift, combustion is pressed stable, and can realize the stabilization of the performance of fuel supplying device.

In addition, according to the present invention, to the lack of lubrication of bearing, therefore can increase the degrees of freedom of installing direction, the easy layout of in limited space, carrying out in the time of avoiding that fuel supplying device is installed in vehicle (namely tilt installing) and vehicle climbing walking sideling.

Mode of execution 2

Mode of execution 2 related fuel supplying devices have stipulated to be located at the position and the position relationship that is installed on the plate 26 of axle 11 of the fuel passage 14 of rotor 10, and other structures are identical with mode of execution 1.

Fig. 5 (a) is the plan view of rotor 10 ends, and Fig. 5 (b) is the sectional view from the cross section of the D-D line of direction of arrow observation Fig. 5 (a).As shown in Figure 5, in the structure of mode of execution 2, with respect to line 35 symmetries of the upper dead center 33 that connects the plate 26 that tilts to be located at axle 11 and lower dead centre 34 and uniformly-spaced to configure fuel passage 14 and steering channel 15.According to this configuration, by fuel passage 14 and steering channel 15 are set, has when rotated not vibrative effect of the motor of making.

Mode of execution 3

The feature of the fuel supplying device that mode of execution 3 is related is the formation position of fuel passage 14, and other structures are identical with mode of execution 1.

Fig. 6 (a) is the sectional view of rotor 10, and Fig. 6 (b) is the sectional view from the cross section of the C-C line of direction of arrow observation Fig. 6 (a), and Fig. 6 (c) is the plan view of observing Fig. 6 (a) from arrow D direction.As shown in Figure 6, in the structure of mode of execution 3, fuel passage 14 is formed at the inner peripheral surface of the magnet 12 of ring-type.Non magnetic supporting mass 13 is identical with mode of execution 1, forms the drum shape, is formed with the steering channel 15 that is communicated with fuel passage 14 in the one side end face.In addition, plane of inclination 16 also similarly forms with mode of execution 1.

Adopt at inner peripheral surface in the formation of rotor 10 and to be provided with in advance under the situation of magnet 12 of depression of the path 14 that acts as a fuel, when adopting the method identical with mode of execution 1, magnet 12 and axle 11 are formed when integrated by insert part forming, for making shaping resin not flow into the depression of magnet 12, in forming die, for example be provided with pin-shaped shape, seal depressed part, by this, can guarantee after shaping, fuel passage 14 is formed on the separatrix of magnet 12 and the resin of non magnetic supporting mass 13.

According to the structure of mode of execution 3, because the fuel passage of concavity towards axially being formed at the magnet inner peripheral surface, therefore, also can being passed through sintering, injection molding etc. and make magnet, can increase the kind of applicable magnet.

Mode of execution 4

The feature of the fuel supplying device that mode of execution 4 is related is the formation of the magnet of rotor, and other structures are identical with mode of execution 1.

Fig. 7 (a) is the sectional view of rotor 10, and Fig. 7 (b) is the sectional view from the cross section of the E-E line of direction of arrow observation Fig. 7 (a), and Fig. 7 (c) is the plan view of observing Fig. 7 (a) from arrow F direction.As shown in Figure 7, in the structure of mode of execution 4, as magnet, adopt the plastic magnet 12a of injection molding formula.Like this, plastic magnet 12a directly is formed on the axle 11 by injection molding.The fuel passage 14 identical with mode of execution 1 and steering channel 15 and the shaping of plastic magnet 12a are formed simultaneously.For the magnetic circuit in 14 couples of plastic magnet 12a of fuel passage is not impacted, guarantee that fuel passage 14 is apart from the distance (thickness) of the outer circumferential face regulation of plastic magnet 12a.On a side end face of the rotor 10 that is formed by plastic magnet 12a, when the injection molding of plastic magnet 12a, form the steering channel 15 that is communicated with fuel passage 14.In addition, also form simultaneously plane of inclination 16.

According to the structure of mode of execution 4, except the shaping that can make fuel passage hole and magnet forms simultaneously, can also reduce number of spare parts, realize cost degradation.

Claims

1. fuel supplying device, by the rotary actuation pump section of motor part, pump section pressurizes to the fuel that sucks and with its discharge, it is characterized in that,

Described motor part comprises:

Stator, this stator are by support, iron core and be wound in this coil unshakable in one's determination and consist of;

Rotor, this rotor is relative with described stator, rotates centered by axle;

The partition body that bottomless drum shape is arranged, this partition body separates described stator and described rotor, and is communicated with described pump section, and inside is full of fuel; And

Bearing, this bearing is located at the bottom of described partition body, supports an end of the axle of described rotor,

Described rotor is made of the non magnetic supporting mass of the drum shape that is fixed in described axle and the magnet that is fixed in around this non magnetic supporting mass, described rotor is provided with a plurality of fuel passage that run through abreast described rotor with described axle, be formed with the steering channel of the fuel that is communicated with described fuel passage on the described non magnetic supporting mass end face of described pump section side towards the outer circumferential side ground of described rotor, described steering channel forms fan-shaped as the fan axle position of described fuel passage.

2. fuel supplying device as claimed in claim 1 is characterized in that,

Described fuel passage is formed at described non magnetic supporting mass.

3. fuel supplying device as claimed in claim 1 is characterized in that,

Described fuel passage is formed on the separatrix of described magnet and described non magnetic supporting mass.

4. fuel supplying device as claimed in claim 1 is characterized in that,

Described non magnetic supporting mass is formed by resin, and described magnet is fixed in described axle by the inserts ester moulding.

5. fuel supplying device as claimed in claim 1 is characterized in that,

Described fuel passage with the concentric circle of described rotor periphery on uniformly-spaced to arrange.

6. fuel supplying device as claimed in claim 1 is characterized in that,

On the described pump section side end of described rotor shaft, with respect to described axle the plate that the piston to compressed fuel drives is installed obliquely.

7. fuel supplying device as claimed in claim 6 is characterized in that,

Described fuel passage is with respect to the upper dead center of the plane of inclination that connects described plate and the line balanced configuration of lower dead centre.

8. fuel supplying device as claimed in claim 1 is characterized in that,

Circumferential part in the described pump section side end face of described rotor is provided with the plane of inclination towards described bearing side.