JP2007002733A - Motor integrated pump and fuel supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a motor integrated pump capable of cooling and lubricating a motor part and of discharging motor foreign matters without making fluid discharged from a pump part flow in the motor part, and a fuel supply device. <P>SOLUTION: The motor integrated pump 10 is provided with the pump part 12 sucking, pressurizing and discharging fluid and the motor part 14 driving the pump part 12. Each of a fluid system 47 in which fluid is flowed in the pump part 12 and a fluid system 48 in which fluid is flowed in the motor part 14 is constituted by an independent fluid system. The fuel supply device 70 is provided with the fuel pump (motor integrated pump) 10, a suction filter 72 and a pressure regulating valve 74 and is modularized. Surplus fuel discharged from the pressure regulating valve 74 is introduced to the fluid system 48 of the motor part 14 of the pump 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a motor-integrated pump and a fuel supply device.

A conventional example of a fuel supply apparatus including a motor-integrated pump as an in-tank fuel pump will be described. This fuel supply device is a fuel supply device in a returnless system that mainly supplies fuel in a fuel tank mounted on a vehicle such as an automobile to an internal combustion engine, a so-called engine. The returnless system is a system configured to process excess fuel in the fuel tank and not return to the fuel tank via the engine side. 24 is a schematic diagram showing the fuel supply device, and FIG. 25 is a flow path system diagram of the fuel supply device.
As shown in FIG. 24, the fuel supply device 370 is provided with a suction filter 372, a high-pressure filter 373, and a pressure regulating valve 374 in addition to the fuel pump 310, and is modularized and a reserve cup 378 installed in the fuel tank 376. Placed inside. The fuel pump 310 is also called a “fuel pump”. The high-pressure filter 373 is also called a “fuel filter” or a “post-filter”. The pressure regulating valve 374 is also referred to as a “pressure regulator”. The suction filter 372 is also called a “suction filter”, “low pressure filter”, or “pre-filter”. The reserve cup 378 is also called a “cup” or a “sub tank”.

  The fuel pump 310 is a motor-integrated pump including a pump unit 312 that sucks and pressurizes and discharges fuel, and a motor unit 314 that drives the pump unit 312. The fuel pump 310 sucks and pressurizes the fuel in the reserve cup 378 by the pump unit 312, then flows through the pump unit 312 and discharges it to the high-pressure filter 373. The motor unit 314 is configured by a brushed DC motor including a commutator (not shown) and a brush (not shown) that are in sliding contact with each other, for example. Further, the motor 314 is cooled and lubricated by the fuel flowing through the motor unit 314, and the foreign matter contained in the fuel, the commutator (not shown), and the brush (not shown) are in sliding contact. The generated motor foreign matter (see a circle in FIG. 25) is discharged out of the motor unit 314. The motor foreign matter includes brush wear powder and commutator wear powder generated by sliding contact between a commutator (not shown) of the motor unit 314 and a brush (not shown).

The suction filter 372 is placed in front of the fuel pump 310 and captures relatively large foreign matters (see □ in FIG. 25) contained in the fuel sucked into the pump unit 312 of the fuel pump 310. This prevents or reduces troubles in later (downstream) devices (for example, the fuel pump 310).
Further, the high-pressure filter 373 (see FIG. 25) is placed behind the fuel pump 310, and relatively small foreign matters (see Δ in FIG. 25) contained in the fuel, and the motor foreign matter. Capturing and removing (see the circle in FIG. 25) prevents or reduces troubles in later (downstream) devices (for example, the pressure regulating valve 374, the injector 392 (see FIG. 24), etc.). To do.
The pressure regulating valve 374 adjusts the fuel pressure of the pressurized fuel discharged from the high pressure filter 373 and discharges excess high pressure fuel into the reserve cup 378. The pressurized fuel whose fuel pressure has been adjusted by the pressure regulating valve 374 is discharged from the fuel supply line 386 in the fuel tank 376 to the fuel supply line 388 outside the fuel tank 376. As shown in FIG. 24, the fuel discharged to the tank external fuel supply line 388 is injected through the engine delivery pipe 390 and the injector 392, and reaches the combustion chamber (not shown) of the engine body 394.

  In the fuel supply device 370, when the fuel pump 310 is driven by the motor unit 314, the fuel in the reserve cup 378 of the fuel tank 376 is sucked through the suction filter 372 and pressurized, and then the pump It circulates in the section 312 and is supplied to the high pressure filter 373. The fuel that has passed through the high pressure filter 373 is supplied from the fuel supply line 386 in the tank to the fuel supply line 388 outside the tank. Further, the fuel pressure of the pressurized fuel in the in-tank fuel supply line 386 is adjusted by the pressure regulating valve 374, and surplus high pressure fuel is discharged into the reserve cup 378. Further, among the foreign matters contained in the fuel, relatively large foreign matters (see □ in FIG. 25) are captured by the suction filter 372 and removed. Further, relatively small foreign matters (see Δ in FIG. 25) and motor foreign matters (see ○ in FIG. 25) contained in the fuel are captured and removed by the high-pressure filter 373.

A motor-integrated pump in which fuel discharged from the pump unit circulates in the motor unit, such as the fuel pump 310, is described in Patent Document 1, for example.
A motor-integrated pump in which fuel discharged from the pump unit does not flow through the motor unit is described in Patent Document 2, for example.
A fuel supply device that returns excess fuel discharged from a pressure regulating valve arranged on the engine side to a fuel tank is described in, for example, Patent Document 2. Also in the fuel pump in Patent Document 2, the fuel discharged from the pump unit flows through the motor unit. Further, in Patent Document 2, surplus fuel and cooling fluid from the pressure regulating valve are circulated through the respective chambers formed on the outer peripheral portion of the fuel pump, thereby cooling the fuel pump and fuel (including surplus fuel).
JP 2005-16312 A JP-A-11-201085 JP-A-11-218057

In the fuel pump 310 provided in the fuel supply device 370, the fuel pressurized by the pump unit 312 is circulated in the motor unit 314. The same applies to the fuel pumps described in Patent Documents 1 and 3.
For this reason, it is necessary to place a high-pressure filter 373 behind the fuel pump 310 in the fuel supply device 370. The reason is that motor foreign matter (see ◯ in FIG. 25) and relatively small foreign matter (see △ in FIG. 25) are devices (for example, pressure regulating valve 374, injector 392, etc.) thereafter (downstream). This is because it is captured and removed so as not to cause problems.
In addition, the suction filter 372 needs to be placed in front of the fuel pump 310. The reason is that a relatively large foreign substance (see a circle in FIG. 25) contained in the fuel in the fuel tank 376 (or the reserve cup 378) is used after the device (for example, the fuel pump 310). This is because it is captured and removed so as not to cause a problem in the pump unit 312 or the like.

Therefore, in the conventional fuel supply device 370, not only the suction filter 372 but also the high-pressure filter 373 is required, so the fuel supply device 370 must be increased in size and cost. The same applies to the fuel supply device described in Patent Document 3.
Moreover, in the fluid pump of patent document 2, since the fuel pressurized by the pump part is not distribute | circulated in a motor part, the problem by a motor foreign material is eliminated. However, since fluid does not flow through the motor unit, it is difficult not only to cool the motor unit efficiently, but also because the sliding contact part of the motor unit cannot be lubricated and motor foreign matter generated in the motor unit cannot be discharged. It is not preferable.

  SUMMARY OF THE INVENTION Problems to be solved by the present invention include a motor-integrated pump and a fuel supply device that can cool and lubricate a motor unit and discharge motor foreign matter without causing fluid discharged from the pump unit to flow through the motor unit. Is to provide.

The above-described problems can be solved by a motor-integrated pump and a fuel supply device having the structure described in the claims of the present invention.
That is, according to the motor-integrated pump described in claim 1, the fluid system in which the fluid flows in the pump section and the fluid system in which the fluid flows in the motor section are independent fluid systems. It is composed. Accordingly, the fluid that has flowed through the fluid system of the pump unit can be discharged without flowing through the fluid system of the motor unit, and cooling and lubrication of the motor unit and the motor can be performed by the fluid flowing through the fluid system of the motor unit. Foreign matter can be discharged.

  Further, according to the motor-integrated pump described in claim 2, the fluid flowing into the fluid system of the motor unit constituted by the brushed DC motor is caused to slide between the commutator and the brush. It flows toward the sliding contact part. Thereby, the adhesion and biting of foreign matters at the sliding contact portion between the commutator and the brush can be prevented or reduced.

  According to the motor-integrated pump described in claim 3, the motor part (magnetic circuit part centered on the coil) or the electric circuit constituted by a non-contact brushless motor having no brush The part can be cooled by the fluid flowing into the fluid system of the motor part, and the performance change due to the heat generation can be suppressed. Further, the sliding portion such as the bearing of the motor portion is lubricated by the fluid flowing into the fluid system of the motor portion, so that wear of the sliding portion can be prevented or reduced.

  Further, according to the motor-integrated pump described in claim 4 of the claims, the fluid flowing through the fluid system of the motor unit flows along the rotation direction of the rotor of the motor unit. Thereby, the rotational resistance of a rotor can be reduced and the current consumption of a motor part can be reduced.

Further, according to the fuel supply device described in claim 5, the in-tank type fuel pump that sucks in and pressurizes the fuel in the fuel tank, and in the fuel sucked into the fuel pump. The intake filter that captures and removes foreign matter and a pressure regulating valve that adjusts the fuel pressure of the pressurized fuel discharged from the fuel pump and discharges excess pressurized fuel are modularized. And the structure which introduces the surplus fuel discharged | emitted from a pressure regulation valve into the fluid system of the motor part of the motor integrated pump using the motor integrated pump as described in any one of Claims 1-3 as a fuel pump It is what.
Therefore, the fuel that has flowed through the fluid system of the pump unit can be discharged without flowing through the fluid system of the motor unit, and cooling and lubrication of the motor unit and motor foreign matter can be performed by the fuel flowing through the fluid system of the motor unit. It is possible to provide a fuel supply device provided with a motor-integrated pump capable of discharging the fuel as a fuel pump.
Further, since the motor foreign matter is not included in the fuel that has flowed through the fluid system of the pump unit, it is possible to omit a high-pressure filter that conventionally needs to be placed behind the fuel pump. Therefore, by omitting the high-pressure filter, the fuel supply device can be made compact and the cost can be reduced.
Further, in the intake filter, the foreign matter in the fuel sucked into the fuel pump and the foreign matter affecting the sliding portion of the pump portion are captured and removed, so that the life of the fuel pump is increased and the fuel pump is removed. It is possible to prevent or reduce troubles of sliding parts in subsequent devices (for example, pressure regulating valves, injectors, etc.).

  Moreover, according to the fuel supply device described in claim 6 of the claims, the fuel supply device can be miniaturized by integrating the pressure regulating valve into the fuel pump.

  According to the fuel supply device described in claim 7 of the claims, the fuel pump is provided with the vapor discharge port for discharging the vapor contained in the fuel flowing through the fluid system of the motor unit to the outside of the pump. Yes. Thereby, the vapor contained in the fuel flowing through the fluid system of the motor unit can be discharged out of the pump from the vapor discharge port.

  Further, according to the fuel supply device described in claim 8, the fuel is transferred by the jet pump driven by using the fuel flow flowing out from the fluid system of the motor part of the fuel pump as the drive source. be able to. For example, when a reserve cup is provided that is installed in the fuel tank and stores the fuel sucked into the fuel pump, the fuel in the fuel tank and outside the reserve cup can be transferred into the reserve cup by the jet pump. it can.

  According to the fuel supply device described in claim 9 of the claims, the fuel supply device can be miniaturized by integrating the jet pump with the fuel pump.

  Further, according to the fuel supply device described in claim 10 of the claims, a return system for providing the fuel flowing out from the fluid system of the motor part of the fuel pump into the suction filter is provided. Thereby, the negative pressure generated in the suction filter can be relieved by the fuel suction input by the pump portion of the fuel pump and the fuel passage resistance of the suction filter. Therefore, the generation of vapor in the suction filter due to the low-pressure boiling of low-boiling components in the fuel at high temperatures or in low-pressure environments is suppressed, and the discharge flow rate is reduced by the fuel pump pump sucking the vapor. Can be prevented or reduced.

  Moreover, according to the fuel supply device described in claim 11 of the claims, the return system is provided with a vapor separation device for separating vapor contained in the fuel. Thus, the vapor contained in the fuel flowing through the return system can be separated by the vapor separation device, and the vapor can be prevented or reduced from entering the suction filter.

  According to the fuel supply device of the twelfth aspect of the present invention, the suction filter includes a filter medium having a multilayer structure. As a result, the foreign matters contained in the fuel can be effectively captured and removed by the filter medium having the multilayer structure of the suction filter.

  According to the fuel supply device described in claim 13 of the claims, the multilayered filter medium is configured such that the outer layer side is a coarse filter medium and the inner layer side is a fine filter medium. Thereby, a large foreign material can be captured and removed by the coarse filter medium on the outer layer side, and a small foreign material can be captured and removed by the fine filter medium on the inner layer side. Accordingly, by capturing and removing foreign substances in stages, clogging of the fine filter medium on the inner layer side can be suppressed, and the life of the suction filter can be extended.

  According to the motor-integrated pump and the fuel supply device of the present invention, the fluid that has flowed through the fluid system of the pump unit can be discharged without flowing through the fluid system of the motor unit, and the fluid flows through the fluid system of the motor unit. By circulating, the motor part can be cooled and lubricated, and motor foreign matter can be discharged.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to the following examples.

[Example 1]
A motor-integrated pump according to Example 1 of the present invention will be described. In this embodiment, a Wesco type (also called impeller type) motor-integrated pump will be described. 1 is a cross-sectional view showing a motor-integrated pump, FIG. 2 is also a top view, FIG. 3 is a bottom view, FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. It is a road system diagram.
As shown in FIG. 1, the motor-integrated pump 10 integrally includes a pump unit 12 that sucks and pressurizes and discharges a fluid, and a motor unit 14 that drives the pump unit 12.
The pump casing 15 that forms the outer shell of the motor-integrated pump 10 includes a substantially cylindrical housing cylinder 16, a motor cover 17 that closes one end face (the upper end face in FIG. 1) of the housing cylinder 16, and the housing cylinder 16. A pump cover 18 that closes the end surface (the lower end surface in FIG. 1), and a pump housing 19 that is provided on the pump cover 18 in a superposed manner and partitions the inside of the pump casing 15 into a motor chamber 20 and a pump chamber 21. Yes.

First, the motor unit 14 will be described. The motor unit 14 is constituted by a DC motor with a brush, for example. The motor unit 14 includes a magnet 23 fixed to the inside of the housing cylinder 16 and a rotor 24 that is driven to rotate within the housing cylinder 16.
The rotor 24 includes a substantially cylindrical rotor body 25 including an iron core, a coil, a commutator 26, and the like, and a substantially round bar-shaped rotor shaft 27 penetrating the axial center portion of the rotor body 25 in the vertical direction. One end portion (upper end portion in FIG. 1) of the rotor shaft 27 is rotatably supported by the motor cover 17 via a bearing 28. Further, the other end portion (lower end portion in FIG. 1) of the rotor shaft 27 is rotatably supported by the pump housing 19 via a bearing 29 in a state of penetrating the pump housing 19. The commutator 26 of the rotor body 25 faces the motor cover 17 at a predetermined interval.

  As shown in FIG. 4, the motor cover 17 incorporates a brush 30 that slides into contact with the commutator 26 of the rotor body 25 of the rotor 24 and a spring 31 that presses the brush 30 against the commutator 26. Although not shown, the motor cover 17 is provided with a connector portion including a terminal electrically connected to the brush 30. The rotor 24 is driven to rotate when a coil (not shown) of the rotor body 25 is energized through the terminal of the connector portion, the brush 30 and the commutator 26.

  As shown in FIG. 1, the motor cover 17 is formed with an inlet 33 and an outlet 35 that communicate with the motor chamber 20 and open upward in FIG. 1 (see FIG. 2). The opening end surface of the inflow port 33 on the motor chamber 20 side (lower side in FIG. 1) faces the end surface (upper end surface in FIG. 1) of the commutator 26 of the rotor body 25 of the rotor 24. Moreover, the inflow port 33 and the outflow port 35 are formed symmetrically between the rotor shafts 27 of the rotor 24 (see FIGS. 1 and 2).

  Next, the pump unit 12 will be described. As shown in FIG. 1, a substantially disc-shaped impeller 37 is rotatably provided in the pump chamber 21. A large number of blade grooves 38 arranged at predetermined intervals in the circumferential direction are formed on the outer peripheral portion of the impeller 37 in a symmetrical manner. The front and back blade grooves 38 are communicated with each other through a communication hole 39. A shaft hole 37 a is formed at the center of the impeller 37. In the shaft hole 37a, the end portion (the lower end portion in FIG. 1) of the rotor shaft 27 of the rotor 24 is engaged so that torque can be transmitted.

In the pump cover 18, a wall surface facing the impeller 37 is formed with an arc-shaped (for example, C-shaped) channel groove 41 corresponding to the blade groove 38 of the impeller 37.
In the pump housing 19, an arc-shaped (for example, C-shaped) flow channel groove 42 corresponding to the blade groove 38 of the impeller 37 is formed on the wall surface facing the impeller 37. The flow channel groove 42 of the pump housing 19 and the flow channel groove 41 of the pump cover 18 are formed symmetrically with respect to the impeller 37 therebetween.

  The pump cover 18 is formed with a suction port 43 that communicates with the starting end of the flow channel 41 and opens downward in FIG. 1 (see FIG. 3). Further, the pump cover 18 is formed with a discharge port 44 that communicates with the terminal end of the flow channel 41 and opens downward in FIG. 1 (see FIG. 3). Further, a vapor discharge port 45 is formed in the pump cover 18 so as to communicate in the middle from the start end to the end of the flow channel 41 and open downward in FIG. 1 (see FIG. 3). The vapor discharge port 45 discharges the vapor contained in the fuel in the pump stroke by the rotation of the impeller 37 to the outside of the pump chamber 21.

Next, the operation of the motor integrated pump 10 will be described.
The rotor 24 is rotationally driven by energization of the coil of the rotor 24 of the motor unit 14 (see FIG. 1). Then, in conjunction with the rotation of the rotor 24, the impeller 37 is rotated in a predetermined direction, thereby generating a pump action. Accordingly, the fluid is sucked into the starting end portion of the flow channel 41 from the suction port 43 of the pump cover 18. The fluid receives kinetic energy from the blade grooves 38 on both the front and back surfaces that communicate with each other through the communication hole 39 of the impeller 37, and the flow passage grooves 41 and 42 of the pump cover 18 and the pump housing 19 are changed from the start end to the end. It is sent while being pressurized. And the fluid sent to the terminal part of both flow-path grooves 41 and 42 is discharged out of the pump from the discharge port 44 of the pump cover 18. In addition, the flow path through which the fluid flows in the pump unit 12 is referred to as “the fluid system of the pump unit” (reference numeral 47) (see FIG. 5).
In addition to the fluid system 47 of the pump unit 12, the fluid that flows into the motor chamber 20 from the inlet 33 of the motor cover 17 flows through the motor chamber 20 and is then pumped from the outlet 35 of the motor cover 17. It is discharged outside (see FIG. 1). In addition, the flow path through which the fluid flows in the motor unit 14 is referred to as “the fluid system of the motor unit” (reference numeral 48) (see FIG. 5). The fluid system 48 of the motor unit is completely or almost completely isolated from the fluid system 47 of the pump unit, and the fluid does not flow from the pump chamber 21 to the motor chamber 20.

  According to the motor-integrated pump 10 described above, the fluid system 47 through which fluid flows in the pump section 12 and the fluid system 48 through which fluid flows in the motor section 14 are configured by independent fluid systems (see FIG. 5). As a result, the fluid flowing through the fluid system 47 of the pump unit 12 can be discharged without flowing through the fluid system 48 of the motor unit 14. At the same time, when the fluid flows through the fluid system 48 of the motor unit 14, the motor unit 14 can be cooled and lubricated, and motor foreign matter can be discharged. “Lubrication of the motor unit 14” refers to lubrication of the sliding contact portion in the motor unit 14. Further, “discharge of the motor foreign matter” means that the foreign matter generated in the motor unit 14 is discharged together with the fluid.

Further, the fluid flowing into the fluid system 48 of the motor unit 14 constituted by the DC motor with brush flows toward the sliding contact portion between the commutator 26 and the brush 30 that are in sliding contact with each other. Incidentally, in this embodiment, the fluid that has flowed in through the inlet 33 of the motor unit 14 flows out to the brush sliding contact side end surface 26 a of the commutator 26.
Therefore, when the fluid from the inlet 33 of the motor unit 14 flows out to the end surface 26a on the brush sliding contact side of the commutator 26, foreign matter (mainly brush wear powder, commutator wear powder) from the end surface 26a. Can be removed. As a result, it is possible to prevent or reduce foreign matter adhesion and biting at the sliding contact portion between the commutator 26 and the brush 30. The “sliding contact portion between the commutator and the brush” in this specification includes the end surface 26a on the brush sliding contact side of the commutator 26, the end surface on the commutator sliding contact side of the brush 30, the commutator 26 and the brush. 30 corresponds to the sliding contact portion. Then, it is desirable that the fluid from the inlet 33 of the motor unit 14 flows out toward the sliding contact portion between the commutator 26 and the brush 30.

  In addition, the motor unit 14 can be configured by a non-contact brushless motor having no brush, instead of the brushed DC motor. Then, the motor part 14 (magnetic circuit part centered on the coil) or the electric circuit part composed of a non-contact brushless motor having no brush is cooled by the fluid flowing into the fluid system 48 of the motor part 14. Therefore, the performance change due to the heat generation can be suppressed. Further, the sliding portion such as the bearing of the motor portion 14 is lubricated by the fluid flowing into the fluid system 48 of the motor portion 14, whereby wear of the sliding portion can be prevented or reduced.

[Example 2]
A second embodiment of the present invention will be described. Since the present embodiment is a modification of part of the first embodiment, a duplicate description is omitted. In the following embodiments, the same description will be omitted. 6 is a sectional view showing the motor-integrated pump, FIG. 7 is a top view, and FIG. 8 is a bottom view.
In the second embodiment, the suction port 43 and the discharge port 44 in the pump unit 12 in the motor-integrated pump 10 in the first embodiment and the inflow port 33 and the outflow port 35 in the motor unit 14 are changed.
That is, as shown in FIG. 6, in the pump portion 12, the pump casing 15 has an opening substantially radially outward (leftward in FIG. 8) and branches in the middle thereof, and the flow channel groove 41 of the pump cover 18 and A suction port 51 is formed in communication with each end of the flow channel 41 of the pump housing 19.
Further, the pump casing 15 communicates with the flow channel 41 of the pump cover 18 and the end of the flow channel 41 of the pump housing 19 and joins in the middle of the pump casing 15 so as to be substantially radially outward (leftward in FIG. 6). ) Is formed.
The suction port 51 and the discharge port 55 are parallel to each other (see FIG. 8).

Further, as shown in FIGS. 6 and 7, in the motor portion 14, the outer end (inlet side end) of the inlet 33 of the motor cover 17 is opened outward in the radial direction, and the outlet 35 of the outlet 35 is opened. The outer end (outflow side end) is opened outward in the radial direction. Further, the outer end portions of the inflow port 33 and the outflow port 35 are directed in the opposite direction (left and right direction in FIGS. 6 and 7).
Also with the motor-integrated pump 10 of the above-described second embodiment, the same operation and effect as the first embodiment can be obtained.

[Example 3]
A third embodiment of the present invention will be described. In this embodiment, a part of the second embodiment is modified. FIG. 9 is a sectional view showing the motor-integrated pump, and FIG. 10 is a top view of the same.
In the third embodiment, the inlet 33 and the outlet 35 in the motor unit 14 in the motor-integrated pump 10 in the second embodiment are modified. That is, as shown in FIG. 9, in the motor portion 14, the housing cylinder 16 is formed with an inlet 60 that opens an end portion (lower end portion in FIG. 9) near the pump housing 19 of the motor chamber 20.
The housing cylinder 16 is formed with an outlet 62 that opens an end (upper end in FIG. 9) of the motor chamber 20 near the motor cover 17.
Accordingly, the inflow port 60 and the outflow port 62 are formed so as to be arranged in a tangential line along the rotation direction of the rotor 24 as shown in FIG. The inflow port 60 allows fluid to flow into the motor chamber 20 from the outside of the motor chamber 20 along the rotation direction of the rotor 24 (see arrow Y in FIG. 10). The outflow port 62 allows the fluid in the motor chamber 20 to flow out along the direction of rotation of the rotor 24 (see arrow Y in FIG. 10). Therefore, the fluid flowing in the motor chamber 20 flows along the rotation direction of the rotor 24 of the motor unit 14 (see arrow Y in FIG. 10).

Also with the motor-integrated pump 10 of the above-described third embodiment, the same operation and effect as in the first and second embodiments can be obtained.
Further, the fluid flowing through the fluid system 48 of the motor unit 14 (specifically, in the motor chamber 20) flows along the rotation direction of the rotor 24 of the motor unit 14 (see arrow Y in FIG. 10). Thereby, the rotational resistance of the rotor 24 can be reduced and the current consumption of the motor part 14 can be reduced.

[Example 4]
Embodiment 4 of the present invention will be described. In this embodiment, there is provided a fuel supply device for a returnless system in which the motor-integrated pump 10 of the first embodiment (see FIG. 1) is used as an in-tank fuel pump (same reference numeral as that of the motor-integrated pump) 10. Illustrate. FIG. 11 is a schematic diagram showing the fuel supply device, and FIG. 12 is a flow path system diagram of the fuel supply device.
As shown in FIG. 11, the fuel supply device 70 includes an intake filter 72 and a pressure regulator (referred to as a pressure regulating valve) 74 in addition to the fuel pump 10 that is the motor-integrated pump 10 of the first embodiment (see FIG. 1). Are arranged in a reserve cup (simply referred to as a cup) 78 that is modularized and installed in the fuel tank 76. Note that the reserve cup 78 is also called a sub tank, a reservoir cup, or the like, and is disposed at the bottom of the fuel tank 76 so that the fuel in the fuel tank 76 can flow in and can be stored (FIG. 12). reference.).

First, the suction filter 72 will be described. The suction filter 72 in the present embodiment is an “integrated filter” having both functions of the suction filter 372 and the high-pressure filter 373 in the conventional example (see FIGS. 24 and 25). The suction filter 72 has a filter medium 80 formed in a substantially bag shape, and a connection port (not shown) that communicates the internal space of the filter medium 80 to the outside. The connection port (not shown) is connected to the suction port 43 of the pump unit 12 of the fuel pump 10. Further, the filter medium 80 captures and removes foreign matters in the fuel sucked into the pump portion 12 of the fuel pump 10 from the reserve cup 78.
Further, the filter medium 80 of the suction filter 72 in the present embodiment has a multilayer structure (two layers in this embodiment), and the outer layer side is a coarse filter medium 81 and the inner layer side is a fine filter medium 82 (FIG. 12). The coarse filter medium 81 on the outer layer side has, for example, a foreign matter capturing / removing function substantially equivalent to the foreign matter capturing / removing function of the conventional suction filter 372 (see FIG. 25). Further, the fine filter medium 82 having a fine inner layer side has, for example, a foreign matter capturing / removing function substantially equivalent to the foreign matter capturing / removing function of the conventional high-pressure filter 373 (see FIG. 25).

  As shown in FIG. 11, an out-tank fuel supply line 88 outside the fuel tank 76 is connected to the discharge port 44 of the fuel pump 10 via an in-tank fuel supply line 86 in the fuel tank 76. The fuel discharged to the fuel supply line 88 outside the tank is injected through an engine delivery pipe 90 and an injector 92, and reaches a combustion chamber (not shown) of the engine body 94. A check valve 96 (see FIG. 11) for preventing the back flow of fuel is provided in a portion of the in-tank fuel supply line 86 near the discharge port 44 of the fuel pump 10.

  The pressure regulating valve 74 adjusts the fuel pressure of the pressurized fuel in the in-tank fuel supply line 86 and discharges excess high-pressure fuel. The fuel discharge port of the pressure regulating valve 74 is connected to the inlet 33 of the pump unit 12 of the fuel pump 10 via a return line 98. A return line 100 that opens into the reserve cup 78 is connected to the outlet 35 of the pump portion 12 of the fuel pump 10.

The operation of the fuel supply device 70 will be described (see FIGS. 11 and 12).
When the fuel pump 10 is driven, the fuel in the reserve cup 78 is filtered by passing through the filter medium 80 of the suction filter 72. At this time, when the fuel passes through the filter medium 80 of the suction filter 72, a relatively large foreign substance (see □ in FIG. 12) in the fuel is captured and removed by the coarse filter medium 81. Further, relatively small foreign matters (see Δ in FIG. 12) in the fuel are captured and removed by the fine filter medium 82.

  Thereafter, the fuel that has passed through the filter medium 80 of the suction filter 72 is sucked and pressurized from the suction port 43 of the fuel pump 10 into the fluid system 47 of the pump unit 12 of the pump unit 12 and then from the discharge port 44 into the tank. The fuel is supplied to the fuel supply line 86. Further, the fuel flows through the tank fuel supply line 86 and is supplied to the fuel supply line 88 outside the tank.

  The fuel pressure of the pressurized fuel in the tank fuel supply line 86 is adjusted to a predetermined pressure by the pressure regulating valve 74. Then, the high pressure fuel surplus due to the pressure adjustment flows from the pressure regulating valve 74 through the return line 98 to the motor chamber 20, that is, the fluid system 48 of the motor unit 14 from the inlet 33 of the motor unit 14 of the fuel pump 10. Is done. Further, the fuel flows through the fluid system 48 of the motor unit 14, and then is discharged from the outlet 35 of the motor unit 14 into the reserve cup 78 through the return line 100.

According to the fuel supply device 70 described above, the fuel that has flowed through the fluid system 47 of the pump unit 12 can be discharged without flowing through the fluid system 48 of the motor unit 14, and the fuel is supplied to the fluid system 48 of the motor unit 14. It is possible to provide the fuel supply device 70 including the fuel pump 10 that can cool and lubricate the motor unit 14 and discharge the motor foreign matter by circulating (see FIG. 12).
In addition, since the motor foreign matter is not included in the fuel that has flowed through the fluid system 47 of the pump unit 12, the high-pressure filter 373 (see FIG. 25) that has been conventionally required to be placed behind the fuel pump 10 is omitted. It becomes possible. Therefore, by omitting the high pressure filter 373, the fuel supply device 70 can be made compact and the cost can be reduced.

  Further, in the filter medium 80 of the suction filter 72, the foreign matter in the fuel sucked into the fuel pump 10 and the foreign matter that affects the sliding portion of the pump unit 12 are captured and removed, thereby extending the life of the fuel pump 10. While increasing, the trouble of the sliding part in the apparatus after the fuel pump 10 (for example, the pressure regulation valve 74, the injector 92, etc.) can be prevented or reduced.

  The filter medium 80 of the suction filter 72 includes a multilayer filter medium 80 including a coarse filter medium 81 on the outer layer side and a fine filter medium 82 on the inner layer side (see FIG. 12). Thereby, foreign matters contained in the fuel can be effectively captured and removed by the filter medium 80 having a multilayer structure of the suction filter 72.

  Further, the filter medium 80 having a multilayer structure is configured such that the outer layer side is a coarse filter medium 81 and the inner layer side is a fine filter medium 82 (see FIG. 12). As a result, large foreign substances can be captured and removed by the coarse filter medium 81 on the outer layer side, and small foreign substances can be captured and removed by the fine filter medium 82 on the inner layer side. Accordingly, by capturing and removing foreign substances in stages, clogging of the fine filter medium 82 on the inner layer side can be suppressed, and the life of the suction filter 72 can be extended. In addition, the filter medium 80 having a multilayer structure can also be configured with three or more layers of filter medium. Moreover, it can change suitably also about the hierarchy of the filter medium which comprises the filter medium of a multilayer structure. The suction filter 72 can be replaced with a filter medium having a single-layer structure instead of the filter medium 80 having a multilayer structure.

Moreover, since the fuel discharged from the pressure regulating valve 74 cools and lubricates the motor unit 14 of the fuel pump 10 and discharges motor foreign matter, the motor unit 14 can be effectively cooled. Therefore, it is possible to prevent or reduce performance degradation of the motor unit 14.
Further, the vapor contained in the fuel discharged from the pressure regulating valve 74 can be separated by the motor chamber 20 of the fuel pump 10. That is, the vapor contained in the fuel can be separated by using the motor chamber 20 as a decompression chamber. This is also advantageous in reducing the noise of the motor unit 14.

[Example 5]
A fifth embodiment of the present invention will be described. In this embodiment, a part of the fourth embodiment (see FIG. 11) is modified. FIG. 13 is a cross-sectional view showing the periphery of the fuel pump of the fuel supply apparatus.
In the fifth embodiment, as shown in FIG. 13, the upstream end of the fuel supply line 86 in the tank is inserted into the discharge port 44 of the fuel pump 10 in a sealed state via a seal member 103 such as an O-ring. Connected by coupling. In addition, the “insertion coupling” in the present specification refers to a connection using a wire joint by a receiving port and an insertion port.
A return line 98 is integrally formed with the fuel supply line 86 in the tank. A pressure regulating valve 74 is connected to the return line 98 through a seal member 105 such as an O-ring in a sealed state.
The downstream end of the return line 98 is connected to the inlet 33 of the fuel pump 10 in a sealed state via a seal member 108.

According to the present embodiment, the discharge port 44 of the fuel pump 10 and the upstream end of the in-tank fuel supply line 86 are connected in a sealed state via the seal member 103, so that fuel leaks from the connecting portion. Can be prevented or reduced.
Further, since the return line 98 and the pressure regulating valve 74 are connected in a sealed state via the seal member 105, fuel leakage from the connecting portion can be prevented or reduced.
Further, since the inlet 33 of the fuel pump 10 and the downstream end of the return line 98 are connected in a sealed state via the seal member 108, fuel leakage from the connecting portion can be prevented or reduced. it can.

[Example 6]
Embodiment 6 of the present invention will be described. In this embodiment, a part of the fourth embodiment (see FIG. 11) is modified. FIG. 14 is a schematic view showing a fuel supply device.
In the sixth embodiment, as shown in FIG. 14, the pressure regulating valve 74 in the fourth embodiment is integrated with the motor cover 17 of the fuel pump 10. The check valve 96 is incorporated in the discharge port 44 of the fuel pump 10.
Therefore, according to the fuel supply device 70 (see FIG. 14) of the present embodiment, the fuel supply device 70 can be downsized by integrating the pressure regulating valve 74 with the fuel pump 10.

[Example 7]
A seventh embodiment of the present invention will be described. In this embodiment, a part of the fourth embodiment (see FIG. 11) is modified. FIG. 15 is a schematic view showing a fuel supply device.
In the seventh embodiment, the fuel pump 10 (for example, the motor cover 17 (see FIG. 1)) is provided with a vapor discharge port 110 that allows the motor chamber 20 to communicate with the outside. The vapor discharge port 110 is formed so that the vapor contained in the fuel flowing through the fluid system 48 of the motor unit 14 can be discharged out of the pump.
A vapor separator 112 is provided on the filter medium 80 of the suction filter 72. The vapor separation device 112 includes a vapor separation housing 113 provided in a reverse cup shape on the filter medium 80 of the suction filter 72. The vapor separation housing 113 forms an expansion chamber 114 having a passage cross-sectional area larger than that of the return line 100. A downstream end portion of the return line 100 is connected to the upper wall portion of the vapor separation housing 113. In the filter medium 80 of the suction filter 72, a portion facing the lower end opening surface of the expansion chamber 114 is a vapor separation filter 118.
The check valve 96 is incorporated in the discharge port 44 of the fuel pump 10.

  According to the fuel supply device 70 of the present embodiment, the fuel pump 10 has the vapor discharge port 110 for discharging the vapor contained in the fuel flowing through the fluid system 48 (specifically, the motor chamber 20) of the motor unit 14 to the outside of the pump. Is provided. Thereby, the vapor contained in the fuel flowing through the fluid system 48 of the motor unit 14 can be discharged from the vapor discharge port 110 to the outside of the pump.

  Further, a return system 120 is provided for allowing the fuel flowing out from the fluid system 48 of the motor unit 14 of the fuel pump 10 to flow into the suction filter 72 via the return line 100. Thereby, the negative pressure generated in the suction filter 72 can be relieved by the fuel suction input by the pump portion 12 of the fuel pump 10 and the fuel passage resistance of the suction filter 72. Accordingly, the generation of vapor in the suction filter 72 due to the low-pressure boiling of low-boiling components in the fuel at high temperature or in a low-pressure environment is suppressed, and the discharge caused by the pump unit 12 of the fuel pump 10 sucking in the vapor. A decrease in flow rate can be prevented or reduced.

  Further, the return system 120 is provided with a vapor separation device 112 for separating vapor contained in the fuel. Thereby, the vapor contained in the fuel flowing through the return system 120 can be separated by the vapor separation device 112, and the vapor can be prevented or reduced from entering the suction filter 72. Note that the vapor separator 112 can be omitted because it is provided as necessary.

Further, the fuel flowing through the return system 120 is decompressed in the expansion chamber 114 in the vapor separation housing 113, whereby the vaporized component in the fuel can be bubbled. For this reason, the vapor contained in the pressurized fuel can be easily separated.
Further, the vapor separation filter 118 that is a part of the filter medium 80 of the suction filter 72 restricts the passage of the vapor contained in the pressurized fuel, so that the vapor contained in the pressurized fuel enters the suction filter 72. Intrusion can be prevented or reduced.
Further, a vapor separation filter 118 is formed using a part of the filter medium 80 of the suction filter 72. Thereby, compared with the case where a dedicated vapor separation filter is separately provided, the number of parts can be reduced and the fuel supply device 70 can be reduced in size and cost.

[Example 8]
Embodiment 8 of the present invention will be described. In this embodiment, a part of the seventh embodiment (see FIG. 15) is modified. FIG. 16 is a schematic view showing a fuel supply device.
In the eighth embodiment, as shown in FIG. 16, the motor-integrated pump 10 in the third embodiment (see FIG. 9) is used as the fuel pump 10. In the fuel pump 10, the connection port (not shown) of the suction filter 72 is connected to the suction port 43 of the pump unit 12 in a state where the fuel pump 10 is disposed horizontally. At the same time, the outlet 35 of the motor unit 14 is in contact with the filter medium 80 of the suction filter 72 in a surface contact manner. In the filter medium 80 of the suction filter 72, a portion facing the opening end surface of the outlet 35 of the motor unit 14 is a vapor separation filter 122.
Similarly to the seventh embodiment (see FIG. 15), the fuel pump 10 is provided with a vapor discharge port 110 that communicates the motor chamber 20 to the outside.
The check valve 96 is incorporated in the discharge port 44 of the fuel pump 10.

Also by the fuel supply device 70 of the present embodiment, substantially the same operations and effects as those of the seventh embodiment (see FIG. 15) can be obtained.
Further, by arranging the fuel pump 10 in a horizontal state, the overall height of the fuel supply device 70 can be reduced.

[Example 9]
Embodiment 9 of the present invention will be described. In this embodiment, a part of the seventh embodiment (see FIG. 15) is modified. FIG. 17 is a schematic view showing a fuel supply device.
In the ninth embodiment, the expansion chamber 114 of the vapor separation housing 113 in the vapor separation device 112 has a bottomed spare chamber 124 that does not communicate with the filter medium 80 of the suction filter 72 and a lower surface opening facing the filter medium 80 of the suction filter 72. The separation chamber 125 has a shape and communicates with the preliminary chamber 124 in the upper portion. A downstream end portion of the return line 100 is connected to the upper wall portion of the preliminary chamber 124. Further, a vapor discharge port 126 through which vapor can be discharged is formed on the upper surface of the separation chamber 125.

Also by the fuel supply device 70 of the present embodiment, substantially the same operations and effects as those of the seventh embodiment (see FIG. 15) can be obtained.
Of the fuel flow that has flowed from the return line 100 into the reserve chamber 124 of the expansion chamber 114, a strong fuel flow collides with the bottom wall portion 124 a of the reserve chamber 124 and rebounds. In the expansion chamber 114, the vapor contained in the fuel flowing into the separation chamber 125 from the preliminary chamber 124 is discharged through the vapor outlet 126 of the separation chamber 125. Then, the pressurized fuel containing almost no vapor flows into or returns to the filter medium 80 of the suction filter 72 from the separation chamber 125 through the vapor separation filter 118. Thereby, the vapor contained in the pressurized fuel can be prevented or reduced from entering the suction filter 72.

  In addition, the pressurized fuel flow that has flowed into the expansion chamber 114 of the vapor separation housing 113 collides with the bottom wall portion 124a of the preliminary chamber 124 and is agitated, whereby the vaporized component in the pressurized fuel is bubbled. Can do. For this reason, the vapor contained in the pressurized fuel can be easily separated.

[Example 10]
A tenth embodiment of the present invention will be described. In this embodiment, a part of the seventh embodiment (see FIG. 15) is modified. FIG. 18 is a schematic view showing a fuel supply device.
In Example 10, as shown in FIG. 18, the vapor separation housing 113 of the vapor separation device 112 is formed in a vertically long shape with its lower surface in contact with the filter medium 80 of the suction filter 72 in surface contact. . The return line 100 is connected to the center of the vapor separation housing 113 in the height direction. A vapor discharge port 128 through which vapor can be discharged is formed at the upper end of the vapor separation housing 113.

Also by the fuel supply device 70 of the present embodiment, substantially the same operations and effects as those of the seventh embodiment (see FIG. 15) can be obtained.
Further, since the vapor separation housing 113 of the vapor separation device 112 is formed in a vertically long shape, the vapor in the fuel can be separated by gravity separation, and the vapor can be discharged from the vapor discharge port 128. Thereby, the vapor contained in the pressurized fuel can be prevented or reduced from entering the suction filter 72.

[Example 11]
Embodiment 11 of the present invention will be described. In this embodiment, a part of the fourth embodiment (see FIG. 11) is modified. FIG. 19 is a schematic view showing a fuel supply device.
In the eleventh embodiment, as shown in FIG. 19, a jet that transfers fuel outside the reserve cup 78 into the reserve cup 78 using the fuel flow flowing out from the fluid system 48 of the motor unit 14 of the fuel pump 10 as a drive source. A pump 130 is provided. That is, the return line 100 is connected to a transfer fuel introduction port (not shown) of the jet pump 130. A fuel suction line 131 for sucking fuel outside the reserve cup 78 in the fuel tank 76 is connected to the fuel suction port of the jet pump 130. A fuel discharge line 132 that opens into the reserve cup 78 is connected to the discharge port of the jet pump 130.

  The jet pump 130 removes fuel outside the reserve cup 78 in the fuel tank 76 due to negative pressure generated when the pressurized fuel introduced from the return line 100 is discharged into the reserve cup 78 through the fuel discharge line 132. The fuel is sucked from the fuel suction line 131 through the fuel suction port and fed into the reserve cup 78 through the fuel discharge line 132. That is, the jet pump 130 is a pump action that transfers fuel outside the reserve cup 78 in the fuel tank 76 into the reserve cup 78 using the fuel flow flowing out from the fluid system 48 of the motor unit 14 of the fuel pump 10 as a drive source. Fulfill. In addition, since the basic structure of the jet pump 130 is a well-known thing, the description is abbreviate | omitted.

  According to the fuel supply device 70 described above, the fuel in the fuel tank 76 and outside the reserve cup 78 is driven by the jet pump 130 driven by the fuel flow flowing out from the fluid system 48 of the motor unit 14 of the fuel pump 10 as a drive source. Can be transferred into the reserve cup 78.

[Example 12]
A twelfth embodiment of the present invention will be described. In this embodiment, a part of the embodiment 11 (see FIG. 19) is modified. FIG. 20 is a schematic view showing a fuel supply device.
In the twelfth embodiment, as shown in FIG. 20, the return line 100 in the eleventh embodiment is not connected to the jet pump 130 and is opened in the reserve cup 78.
Similarly to the seventh embodiment (see FIG. 15), the fuel pump 10 (for example, the motor cover 17) is provided with a vapor discharge port 110 that communicates the motor chamber 20 to the outside.
The vapor discharge port 110 is formed so that the vapor contained in the fuel flowing through the fluid system 48 of the motor unit 14 can be discharged out of the pump. A vapor discharge line 134 connected to the vapor discharge port 110 is connected to a transfer fuel introduction port of the jet pump 130.

The jet pump 130 generates fuel outside the reserve cup 78 in the fuel tank 76 due to negative pressure generated when the pressurized fuel introduced from the vapor discharge line 134 is discharged into the reserve cup 78 through the fuel discharge line 132. Is sucked from the fuel suction line 131 through the fuel suction port and fed into the reserve cup 78 through the fuel discharge line 132. That is, the jet pump 130 is a pump action that transfers fuel outside the reserve cup 78 in the fuel tank 76 into the reserve cup 78 using the fuel flow flowing out from the fluid system 48 of the motor unit 14 of the fuel pump 10 as a drive source. Fulfill.
Therefore, also with the fuel supply device 70 of the present embodiment, substantially the same operations and effects as those of the eleventh embodiment (see FIG. 19) can be obtained.

[Example 13]
A thirteenth embodiment of the present invention will be described. In this embodiment, a part of the embodiment 11 (see FIG. 19) is modified. FIG. 21 is a schematic view showing a fuel supply device.
In the thirteenth embodiment, as shown in FIG. 21, the jet pump 130 in the eleventh embodiment (see FIG. 19) is integrated with the motor cover 17 of the fuel pump 10.
Therefore, according to the fuel supply apparatus 70 (see FIG. 21) of the present embodiment, the fuel supply apparatus 70 can be reduced in size by integrating the jet pump 130 with the fuel pump 10.

[Example 14]
Embodiment 14 of the present invention will be described. In this embodiment, a part of the embodiment 11 (see FIG. 19) is modified. FIG. 22 is a schematic view showing a fuel supply device.
In the fourteenth embodiment, as shown in FIG. 22, the return line 100 in the eleventh embodiment is not connected to the jet pump 130 and is opened in the reserve cup 78.
Further, a branch line 136 is branched from the fuel supply line 86 in the tank in the eleventh embodiment. This branch line 136 is connected to the introduction port of the transfer fuel of the jet pump 130. The branch line 136 is provided with a check valve 137 for preventing the back flow of fuel.

  The jet pump 130 reserves in the fuel tank 76 due to the negative pressure generated when the pressurized fuel introduced from the fuel supply line 86 in the tank through the branch line 136 is discharged into the reserve cup 78 through the fuel discharge line 132. The fuel outside the cup 78 is sucked from the fuel suction line 131 through the fuel suction port and fed into the reserve cup 78 through the fuel discharge line 132. That is, the jet pump 130 uses the fuel flow that flows out from the fluid system 47 of the pump unit 12 of the fuel pump 10 as a drive source to pump the fuel outside the reserve cup 78 into the reserve cup 78 within the fuel tank 76. Fulfill.

  According to the fuel supply device 70 of the present embodiment, the jet pump 130 that is driven by using the fuel flow flowing out from the fluid system 47 of the pump unit 12 of the fuel pump 10 as a drive source inside the fuel tank 76 and outside the reserve cup 78. Of the fuel can be transferred into the reserve cup 78.

[Example 15]
A fifteenth embodiment of the present invention will be described. In the present embodiment, a part of the embodiment 14 (see FIG. 22) is modified. FIG. 23 is a schematic view showing a fuel supply device.
In the fifteenth embodiment, as shown in FIG. 23, the branch line 136 in the fourteenth embodiment is omitted.
A vapor discharge line 139 connected to the vapor discharge port 45 (see FIG. 3) of the pump cover 18 in the pump portion 12 of the fuel pump 10 is connected to the transfer fuel introduction port of the jet pump 130.

The jet pump 130 removes fuel outside the reserve cup 78 in the fuel tank 76 by the negative pressure generated when the pressurized fuel introduced through the vapor discharge line 139 is discharged into the reserve cup 78 through the fuel discharge line 132. The fuel is sucked from the fuel suction line 131 through the fuel suction port and fed into the reserve cup 78 through the fuel discharge line 132. That is, the jet pump 130 uses the fuel flow that flows out from the fluid system 47 of the pump unit 12 of the fuel pump 10 as a drive source to pump the fuel outside the reserve cup 78 into the reserve cup 78 within the fuel tank 76. Fulfill.
Therefore, the fuel supply device 70 of the present embodiment can obtain substantially the same operations and effects as those of the fourteenth embodiment (see FIG. 22).

  The present invention is not limited to the above-described embodiments, and modifications can be made without departing from the gist of the present invention. For example, the motor-integrated pump 10 of the present invention can be widely applied as a pump for fluids other than fuel. The present invention can also be applied to a multistage motor-integrated pump 10 provided with a plurality of impellers 37. The present invention can also be applied to a motor-integrated pump 10 of a type other than a Wesco type (for example, an axial flow type, a gear type, etc.). Further, the present invention can be applied not only to the fuel supply device 70 of the returnless system, but also to the fuel supply device of the return system that returns the surplus fuel discharged from the pressure regulating valve arranged on the engine side to the fuel tank. . Further, the reserve cup 78 can be omitted because it is provided as necessary. Further, the return line 100 is provided as necessary and can be omitted. The fluid flowing through the fluid system 48 of the motor unit can be replaced with a fluid other than fuel. In addition, a plurality of at least one of the suction port, the discharge port, the inflow port, and the outflow port of the fuel pump 10 can be provided.

It is sectional drawing which shows the motor integrated pump concerning Example 1 of this invention. It is a top view of a motor integrated pump. It is a bottom view of a motor integrated pump. FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2. It is a flow-path system diagram of a motor integrated pump. It is sectional drawing which shows the motor integrated pump concerning Example 2 of this invention. It is a top view of a motor integrated pump. It is a bottom view of a motor integrated pump. It is sectional drawing which shows the motor integrated pump concerning Example 3 of this invention. It is a top view of a motor integrated pump. It is the schematic which shows the fuel supply apparatus concerning Example 4 of this invention. It is a flow-path system diagram of a fuel supply apparatus. It is sectional drawing which shows the peripheral part of the fuel pump of the fuel supply apparatus concerning Example 5 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 6 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 7 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 8 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 9 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 10 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 11 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 12 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 13 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 14 of this invention. It is the schematic which shows the fuel supply apparatus concerning Example 15 of this invention. It is the schematic which shows the fuel supply apparatus concerning a prior art example. It is a flow-path system diagram of a fuel supply apparatus.

Explanation of symbols

10 Motor integrated pump (fuel pump)
DESCRIPTION OF SYMBOLS 12 Pump part 14 Motor part 24 Rotor 26 Commutator 30 Brush 47 Fluid system of pump part 48 Fluid system of motor part 70 Fuel supply device 72 Suction filter 74 Pressure regulating valve 80 Filter medium of multilayer structure 81 Coarse filter medium 82 Fine filter medium 110 Vapor discharge Outlet 112 Vapor separator 120 Return system 130 Jet pump

Claims (13)

A motor-integrated pump comprising a pump unit that sucks and pressurizes and discharges fluid, and a motor unit that drives the pump unit,
A motor-integrated pump, wherein a fluid system in which fluid flows in the pump section and a fluid system in which fluid flows in the motor section are configured as independent fluid systems. The motor-integrated pump according to claim 1,
The motor unit is composed of a DC motor with a brush provided with a commutator and a brush that are in sliding contact with each other,
The motor-integrated pump, wherein the fluid flowing into the fluid system of the motor unit flows toward the sliding contact portion between the commutator and the brush of the motor unit. The motor-integrated pump according to claim 1,
A motor-integrated pump characterized in that the motor section is constituted by a non-contact brushless motor having no brush. The motor-integrated pump according to any one of claims 1 to 3,
A motor-integrated pump characterized in that a fluid flowing through a fluid system of the motor unit flows along a rotation direction of a rotor of the motor unit. An in-tank fuel pump that sucks and pressurizes and discharges fuel in the fuel tank;
A suction filter that captures and removes foreign matter in the fuel sucked into the fuel pump;
A fuel supply device modularized with a pressure regulating valve that adjusts the fuel pressure of the pressurized fuel discharged from the fuel pump and discharges excess pressurized fuel,
As the fuel pump, the motor-integrated pump according to any one of claims 1 to 3,
The fuel supply device, wherein the surplus fuel discharged from the pressure regulating valve is introduced into a fluid system of a motor portion of the motor-integrated pump. The fuel supply device according to claim 5,
A fuel supply apparatus, wherein the pressure regulating valve is integrated with the fuel pump. The fuel supply device according to claim 5 or 6,
A fuel supply apparatus, wherein the fuel pump is provided with a vapor discharge port for discharging vapor contained in fuel flowing through the fluid system of the motor unit to the outside of the pump. The fuel supply device according to any one of claims 5 to 7,
A fuel supply apparatus comprising: a jet pump driven by using a fuel flow flowing out from a fluid system of a motor section of the fuel pump as a drive source. The fuel supply device according to claim 8,
A fuel supply apparatus, wherein the jet pump is integrated with the fuel pump. The fuel supply device according to any one of claims 5 to 9,
A fuel supply apparatus comprising a return system for allowing fuel flowing out from a fluid system of a motor section of the fuel pump to flow into the suction filter. The fuel supply device according to claim 10,
A fuel supply device, wherein a vapor separator for separating vapor contained in fuel is provided in the return system. The fuel supply device according to claim 10 or 11,
The fuel supply device, wherein the suction filter includes a filter medium having a multilayer structure. The fuel supply device according to claim 12, comprising:
The fuel supply apparatus according to claim 1, wherein the filter medium having a multilayer structure is configured such that the outer layer side is a coarse filter medium and the inner layer side is a fine filter medium.

Images