Motor-integrated pump and fuel supply system therewith
A motor-integrated pump (10) includes a pump portion (12) and a motor portion (14) integrally. The pump portion (12) permits fluid to be drawn thereinto, pressurized and discharged, while the motor portion (14) drives the pump portion (12). A pump-portion fluid path (47), which permits fluid to flow through the pump portion (12), is independent of a motor-portion fluid path 48, which permits fluid to flow through the motor portion (14). A fuel supply system (70) includes the fuel pump (i.e., the motor-integrated pump) (10), a suction filter (72) and a regulator valve (74) in a modularized manner. Excess fuel discharged from the regulator valve 74 is introduced into the motor-portion fluid path (48) of the motor portion (14).
This application claims priority to Japanese patent application serial number 2005-183340, the contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a motor-integrated pump and a fuel supply system therewith.
2. Description of the Related Art
Certain engines use a fuel supply system provided with a motor-integrated pump as an in-tank fuel pump. The fuel supply system includes a returnless system that permits fuel within a fuel tank to be supplied into an internal combustion engine thereof. The returnless system refers to a system constructed so as to process excess fuel within the fuel tank instead of returning it to the fuel tank via the engine. This system is shown in
As shown in
The fuel pump 310 is a motor-integrated pump including a pump portion 312 and a motor portion 314. The pump portion 312 permits fuel to be drawn in, pressurized and discharged, while the motor portion 314 drives the pump portion 312. The fuel pump 310 permits fuel in the reservoir cup 378 to be drawn in and pressurized by the pump portion 312. Then, the fuel is discharged into the high-pressure filter 373 through the pump portion 312. It should be noted that the motor portion 314 is constructed with a brush-type DC motor including a commutator (not shown) and brushes (not shown) slidingly contacting with each other. Also, when flowing through the motor portion 314, the fuel, on one hand, cools and lubricates the motor portion 314. On the other hand, foreign particles (not shown) included in the fuel and motor-generated particles (shown as symbol ◯ in
The suction filter 372 is disposed upstream of the fuel pump 310 so as to capture and remove relatively large foreign particles (shown as symbol □ in
On the other hand, as shown in
The regulator valve 374 does not only regulate fuel pressure of the pressurized fuel coming through the high-pressure filter 373, but also discharges excess fuel into the reservoir cup 378. The pressurized fuel (the pressure being regulated by the regulator valve 374) goes through an in-tank fuel supply line 386 disposed within the fuel tank 376 so as to be discharged into an out-tank fuel supply line 388 disposed outside of the fuel tank 376. As shown in
With respect to the said fuel supply system 370, when the fuel pump 310 is driven by the motor portion 314, the fuel in the reservoir cup 378 of the fuel tank 376 is drawn into the suction filter 372 and pressurized. Then, the fuel passes through the pump portion 312 so as to be supplied to the high-pressure filter 373. The fuel having passed through the high-pressure filter 373 is supplied to the out-tank fuel supply line 388 from the in-tank fuel supply line 386. The regulator valve 374 controls the fuel pressure of the pressurized fuel in the in-tank fuel supply line 386 so as to discharge excess of the high-pressure fuel therefrom into the reservoir cup 378. Also, relatively large particles (shown as symbol □ in
U.S. Pat. No. 7,025,561 discloses a motor-integrated pump similar to the fuel pump 310 that permits fuel discharged from a pump portion to be introduced into a motor portion. On the other hand, Japanese Laid-Open Patent Publication No. 11-201085 discloses a motor-integrated pump that does not permit fuel discharged from a pump portion to be introduced into a motor portion. Further, Japanese Laid-Open Patent Publication No. 11-218057 discloses a fuel supply system that permits excess fuel discharged from a regulator valve disposed on the engine side to be returned into a fuel tank. The fuel pump disclosed in Japanese Laid-Open Patent Publication No. 11-218057 also permits fuel discharged from the pump portion to be introduced into the motor portion. Further, according to Japanese Laid-Open Patent Publication No. 11-218057, excess fuel from the regulator valve and cooling fluid are respectively introduced into each chamber formed outer periphery of the fuel pump so as to cool the fuel pump and the fuel including excess fuel.
The fuel pump disclosed in Japanese Laid-Open Patent Publication Nos. 2000-16312 and 11-218057, and the aforementioned fuel pump 310 of the fuel supply system 370 permit fuel pressurized by the pump portion 312 to be introduced into the motor portion 314. This is why motor-generated particles (shown as symbol ◯ in
Accordingly, the conventional fuel supply system 370 requires not only the suction filter 372 but also the high-pressure filter 373. This requirement forces the size and production cost of the fuel supply system 370 to become increased. This drawback is also found in the fuel supply system disclosed in Japanese Laid-Open Patent Publication No. 11-218057. On the other hand, according to the fluid pump of Japanese Laid-Open Publication No. 11-201085, problems caused by motor-generated particles are avoided, because the fuel pressurized by the pump portion is not introduced into the motor portion. However, this construction is not preferable, not only because it is difficult to cool the motor portion efficiently, but also because it is impossible to lubricate sliding contacts in the motor portion and to discharge motor-generated particles having generated in the motor portion.
SUMMARY OF THE INVENTIONIt is accordingly an object of the present invention to provide an improved motor-integrated pump and a fuel supply system therewith, in which the motor portion is not only cooled and lubricated but also motor-generated particles are discharged without permitting the fluid discharged from the pump portion to be introduced into the motor portion.
According to one aspect of the present invention, a motor-integrated pump is provided that may include a pump portion for drawing fluid thereinto, pressurizing and then discharging the fluid therefrom, and a motor portion for driving the pump portion. The pump portion includes a pump-portion fluid path permitting the fluid to be introduced into the pump portion, while the motor portion includes a motor-portion fluid path independent of the pump-portion fluid path so as to permit fluid to be introduced into the motor portion. This allows the fluid flowing through the pump-portion fluid path to be discharged without permitting the fluid to be introduced into the motor-portion fluid path. Thus, the fluid introduced into the motor-portion fluid path may cool and lubricate the motor portion, as well as discharging motor-generated particles.
Preferably, the motor portion may include a brush-type DC motor having a commutator and brushes slidingly contacting with each other such that the fluid introduced into the motor-portion fluid path is directed toward the sliding contacts between the commutator and the brushes. According to the motor-integrated pump, the fluid introduced into the fluid path of the motor portion including the brush-type DC motor is directed toward the sliding contacts between the commutator and the brushes. This may eliminate or at least reduce adhesion and biting of foreign particles into the sliding contacts between the commutator and the brushes.
Preferably, the motor portion includes a non-contacting, brushless motor. This configuration makes it possible to cool the motor portion, i.e., a magnetic circuit around a coil or an electrical circuit, with the fluid introduced into the motor-portion fluid path, so as to reduce characteristic changes caused by the exothermic heat. Also, it is possible to eliminate or at least reduce wear on sliding portions such as bearings of the motor portion because the sliding portions are lubricated by the fluid introduced into the motor-portion fluid path.
Preferably, the motor portion includes a rotor such that the fluid introduced into the motor-portion fluid path flows in the direction of the rotor rotation. This may lower rotational resistance of the rotor so as to reduce electric current consumption of the motor portion.
According to another aspect of the present invention, a fuel supply system is provided that may include a fluid pump, a filter, and a motor (also referred to as a motor portion herein). The fluid pump includes an inlet member and an outlet member for bringing fluid in and out. The filter is positioned adjacent the inlet member of the fluid pump. The motor having an inlet member and an outlet member for bringing fluid in and out. The outlet member of the fluid pump is connected to the inlet member of the motor.
Preferably, the fuel supply system further includes a regulator valve, which is positioned between and connected to the fluid pump outlet member and the motor inlet member. More preferably, the fuel supply system includes a jet pump, which is connected to the motor outlet member. Yet more preferably, the fuel supply system further includes a multilayered filter, which includes an outer layer having a coarse filter and an inner layer having a fine filter. Still more preferably, the fuel supply system further includes a plurality of sealing members, at least one of which is positioned adjacent the fluid pump outlet member, the regulator valve, and the motor inlet member.
According to yet another aspect of the present invention, a fuel supply system is provided that may include an in-tank fuel pump for drawing fuel thereinto from a fuel tank, pressurizing and then discharging the fluid therefrom, a suction filter for capturing and removing foreign particles in the fuel drawn into the fuel pump, a regulator valve for controlling fuel pressure of the pressurized fuel by discharging excess fuel from the fuel pump. Preferably, the aforementioned elements are modularized. Also, the fuel pump includes the aforementioned motor-integrated pump such that the excess fuel is discharged and introduced from the regulator valve into the motor-portion fluid path of the motor-integrated pump. This makes it possible to omit a high-pressure filter conventionally required to be disposed downstream of the fuel pump because there are no motor-generated particles included in the fuel introduced into the pump-portion fluid path. This allows the fuel supply system to be more compact and reduces costs.
Since the foreign particles, which are included in the fuel drawn into the fuel pump so as to affect on the contact portions in the pump portion, are captured and removed by the suction filter, it is possible to eliminate or at least reduce problems occurring at sliding contacts in devices disposed downstream of the fuel pump (i.e., the regulator valve, the injector, and the like) such that the life of the fuel pump is increased.
Preferably, the regulator valve is integrated into the fuel pump such that the fuel supply system is made more compact.
Preferably, the fuel pump is provided with a vapor discharge port for permitting vapor included in the fuel introduced into the motor-portion fluid path to be discharged to the outside of the fuel pump.
Preferably, the fuel supply system further includes a jet pump driven by the fuel flow coming through the motor-portion fluid path of the fuel pump so as to transfer fuel. For example, in the case that the fuel supply system includes a reservoir cup disposed within the fuel tank so as to reserve fuel drawn by the fuel pump, it is possible for the jet pump to transfer fuel from the outside of the reservoir cup into the reservoir cup within the fuel tank.
Preferably, the jet pump is integrated into the fuel pump of the fuel supply system. This makes the fuel supply system miniaturized.
Preferably, the fuel supply system further includes a return path for permitting the fuel coming through the motor-portion fluid path of the fuel pump to flow into the suction filter. This mitigates negative pressure occurring within the suction filter not only due to fuel drawing force exerted by the pump portion of the fuel pump but also due to resistance when the fuel passes through the suction filter. Thus, less amount of vapor is formed in the suction filter even when low boiling point components included in the fuel boils in decompression environment under elevated temperature or subatmospheric pressure, so that it is possible to eliminate or at least reduce a drop of the discharge flow amount occurring when the pump portion of the fuel pump draws vapor thereinto.
Preferably, the fuel supply system further includes a vapor separator in the return path. Thus, the vapor separator may separate vapor from the fuel flowing through the return path so as to eliminate or at least reduce the vapor entering into the suction filter.
Preferably, the suction filter further includes multilayered filter media. Thus, foreign particles included in the fuel are efficiently captured and removed by the multilayered filter media in the suction filter.
Preferably, the multilayered filter media are provided with outer layers having coarse filter media, and inner layers having fine filter media. Thus, larger foreign particles are captured and removed by the coarse filter media of the outer layers, while smaller foreign particles are captured and removed by the fine filter media of the inner layers. Accordingly, foreign particles are captured and removed in a phase manner such that the fine filter media of the inner layers are prevented from clogging. As a result, the suction filter becomes longer lasting.
BRIEF DESCRIPTION OF THE DRAWINGSAdditional objects, features and advantages of the present invention will be readily understood after reading the following detailed description together with the claims and the accompanying drawings, in which:
Each of the additional features and teachings disclosed above and below may be utilized separately or in conjunction with other features and teachings to provide an improved motor-integrated pump and a fuel supply system therewith. Representative examples of the present invention, which examples utilize many of these additional features and teachings both separately and in conjunction with each other, will now be described in detail with reference to the attached drawings. This detailed description is merely intended to teach a person of skill in the art further details for practicing preferred aspects of the present teachings and is not intended to limit the scope of the invention. Only the claims define the scope of the claimed invention. Therefore, combinations of features and steps disclosed in the following detailed description may not be necessary to practice the invention in the broadest sense, and are instead taught merely to particularly describe representative examples of the invention. Moreover, various features of the representative examples and the dependent claims may be combined in ways that are not specifically enumerated in order to provide additional useful embodiments of the present teachings. Referring now to the drawings, embodiments of the present invention will be described below.
First Embodiment A motor-integrated pump of a first embodiment is shown in FIGS. 1 to 5. The motor-integrated pump described as this embodiment is of Westco or impeller type. As shown in
Firstly, the motor portion 14 will be described. The motor portion 14 includes a motor such as a brush-type DC motor. The motor portion 14 also includes magnets 23 fixed inside of the tubular shell 16, and a rotor 24 rotatably driven in the tubular shell 16. The rotor 24 includes a substantially cylindrical rotor body 25 having an iron core, a coil, a commutator 26, and the like, as well as a substantially round-bar shaped rotor shaft 27 passing generally through the axis of the rotor body 25 in up and down directions. One end of the rotor shaft 27 (i.e., the upper end in
As shown in
As shown in
Next, the pump portion 12 will be described. As shown in
The wall surface of the pump cover 18, which is opposed to the impeller 37, is provided with a substantially arc-shaped or C-shaped flow channel 41 associated with the vane grooves 38 of the impeller 37. Similarly, the wall surface of the pump plate 18, which is also opposed to the impeller 37, is provided with a substantially arc-shaped or C-shaped flow channel 42 associated with the vane grooves 38 of the impeller 37. The flow channel 42 of the pump plate 19 and the flow channel 41 of the pump cover 18 are configured in symmetrical relation with respect to the impeller 37.
As shown in
Next, the operation of the motor-integrated pump 10 will be described. When the coil of the rotor 24 of the motor portion 14 (see
As opposed to the pump-portion fluid path 47, fluid coming from the inflow port 33 of the motor cover 17 is introduced into the motor compartment 20 so as to be discharged to the outside of the pump 10 through the outflow port 35 of the motor cover 17 as shown in
As shown in
Further, as the motor portion 12 includes a brush-type DC motor, the fluid introduced into the motor-portion fluid path 48 is directed toward the sliding contacts between the commutator 26 and the brushes 30. According to the present embodiment, the fluid is introduced into the motor portion 14 through the inflow port 33 so as to be directed toward the brush-contacting end face 26a of the commutator 26. Thus, it is possible to remove foreign particles (mainly, brush-wear particles and commutator-wear particles) from the brush-contacting end face 26a of the commutator 26 so as to eliminate or at least reduce adhesion and biting of such foreign particles into the sliding contacts between the commutator 26 and the brushes 30. It should be noted that the “sliding contacts between the commutator and the brushes” may not only include the brush-contacting end face 26a of the commutator 26, but also include the commutator-contacting end faces of the brushes 30 and the sliding contacts between the commutator 26 and the brushes 30. Preferably, fluid may be directed to flow from the inflow port 33 of the motor portion 14 to the sliding contacts between the commutator 26 and the brushes 30.
The motor portion 14 may include a non-contacting, brushless motor instead of the brush-type DC motor. This configuration makes it possible to cool the motor portion 14 (i.e., the magnetic circuit around the coil) or the electrical circuit with the fluid flowing into the motor-portion fluid path 48, so as to control characteristic changes caused by the exothermic heat. Also, it is possible to eliminate or at least reduce wear on sliding portions such as bearings of the motor portion 14 because the sliding portions are lubricated by the fluid flowing into the motor-portion fluid path 48.
Second EmbodimentReferring to FIGS. 6 to 8, a motor-integrated pump of a second embodiment will be described. Since the second embodiment is a modification of the first embodiment, the elements previously mentioned above will not be described further. This statement is applicable to the other embodiments disclosed herein.
In the motor-integrated pump 10 of the second embodiment, the inlet port 44 and the outlet port 43 of the pump portion 12, and the inflow port 33 and the outflow port 35 of the motor portion 14 are modified from those of the first embodiment. As shown in
With respect to the motor portion 14, as shown in
Referring to
As shown in
As shown in
According to the aforementioned motor-integrated pump 10 of the third embodiment, the same effects and results are obtained as in the first and second embodiments. Since the fluid flowing through the fluid path 48 in the motor portion 14 (more specifically, in the motor compartment 20) passes by the rotor 24 along the rotational direction thereof (see arrow Y in
Referring to
As shown in
Firstly, referring to
As shown in
The regulator valve 74 controls the fuel pressure of the pressurized fuel in the in-tank fuel supply line 86 so as to discharge excess of the high-pressure fuel. The fuel discharge port of the regulator valve 74 is connected to a return line 98, which leads to the inflow port 33 of the motor portion 14 in the fuel pump 10. Then, the outflow port 35 of the motor portion 14 in the fuel pump 10 is connected to a return line 100, the downstream end of which opens into the reservoir cup 78.
Referring to
Then, the fuel having passed the filter media 80 in the suction filter 72 is drawn from the inlet port 43 of the fuel pump 10 into the pump-portion fluid path 47 in the pump portion 12, while being pressurized. Thereafter, the fuel is discharged from the outlet port 44 into the in-tank fuel supply line 86. Further, the fuel passes through the in-tank fuel supply line 86 so as to be supplied to the out-tank fuel supply line 88.
The fuel pressure of the pressurized fuel in the in-tank fuel supply line 86 is controlled by the regulator valve 74 to a predetermined pressure. As shown in
According to this embodiment, as shown in
Since the foreign particles, which are included in the fuel drawn into the fuel pump 10 so as to affect the sliding portions mounted in the pump portion 12, are captured and removed by the filter media 80 in the suction filter 72, it is possible to eliminate or at least reduce problems occurring at sliding contacts in devices disposed downstream of the fuel pump 10 (i.e., the regulator valve 74, the injector 29, and the like) such that the life of the fuel pump 10 is increased.
Further, the filter media 80 in the suction filter 72 is configured as multilayered in order to at least include the outer-layer coarse filter media 81 and the inner-layer fine media 82 as shown in
Still further, the multilayered filter media 80 is configured such that the coarse filter media 81 are disposed in the outer layers, while the fine filter media 82 are disposed in the inner layers as shown in
Since the fuel discharged from the regulator valve 74 is used not only for discharging the motor-generated particles but also for lubricating and cooling the motor portion 14 of the fuel pump 10, the performance degradation of the motor portion 14 is prevented or at least reduced. Also, since the motor compartment 20 of the fuel pump 10 serves as a decompression chamber in order to separate vapor from the fuel discharged from the regulator valve 74, noise produced by the motor portion 14 is advantageously lowered.
Fifth Embodiment Referring to
As shown in
According to this embodiment, fuel leakage is prevented or at least reduced due to the sealed connections by the sealing members 103 and 105, respectively between the outlet port 44 of the fuel pump 10 and the upstream end of the in-tank fuel supply line 86, and between the return line 98 and the regulator valve 74. Also, fuel leakage between the inflow port 33 of the fuel pump 10 and the downstream end of return line 98 is prevented or at least reduced due to the sealing connection by the sealing member 108.
Sixth Embodiment Referring to
As shown in
Referring to
As shown in
As shown in
According to the fuel supply system 70 of this embodiment, the vapor discharge port 110 of the fuel pump 10 permits vapor, which is included in the fuel flowing through the motor-portion fluid path 48 (more specifically, in the motor compartment 20) in the motor portion 14, to be discharged to the outside of the pump 10. Vapor included in fuel is discharged to the outside through both of the vapor discharge ports 110 and 126. The vapor discharge port 110 of the fuel pump 10 serves as main, while the vapor discharge port 126 of the vapor separator 112 serves as auxiliary. If all the vapor is discharged through the vapor discharge port 110 of the fuel pump 10, the vapor discharge port 126 of the vapor separator 112 might be omitted. In this case, the vapor separator 112 might serve merely as a relay portion.
Since the fuel supply system 70 further includes a return path 120 for permitting the fuel coming through the motor-portion fluid path 48 of the fuel pump 10 to flow via the return line 100 into the suction filter 72, it is possible to mitigate negative pressure occurring within the suction filter 72 not only due to fuel drawing force exerted by the pump portion 12 of the fuel pump 10 but also due to resistance when the fuel passes through the suction filter 72. Thus, less amount of vapor is formed in the suction filter 72 even when low boiling point components included in the fuel boils in decompression environment under elevated temperature or subatmospheric pressure environments, so that it is possible to eliminate or at least reduce a drop of the discharge flow amount occurring when the pump portion 12 of the fuel pump 10 draws vapor thereinto.
The return path 120 is provided with the vapor separator 112, which may separate the vapor from the fuel flowing through the return path 120 so as to eliminate or at least reduce the vapor entering into the suction filter 72. It should be noted that the vapor separator 112 may be omitted because it is provided as needed.
Since the fuel flowing the return path 120 is decompressed in the expansion chamber 114 of the vapor separating housing 113 such that the vaporizable components in the fuel are transformed into vapor bubbles, the vapor is readily separated from the pressurized fuel. Further, since the passage of the vapor is restricted by the vapor separating filter 118, which is a part of the filter media 80 of the suction filter 72, it is possible to eliminate or at least reduce the vapor entering into the suction filter 72. Still further, since a part of the filter media 80 of the suction filter 72 is used to form the vapor separating filter 118, it is possible to reduce the number of elements of the fuel supply system 70 so as to permit smaller size and cost than in the case of additionally providing a dedicated vapor separating filter.
Eighth Embodiment Referring to
As shown in
According to the fuel supply system 70 of this embodiment, the same effects and results are obtained as in the seventh embodiment shown in
Referring to
As shown in
According to the fuel supply system 70 of this embodiment, the same effects and results are obtained as in the seventh embodiment shown in
Also, the vapor is readily separated from the pressurized fuel, because the pressurized fuel flow entering into the expansion chamber 114 of the vapor separating housing 113 is stirred during the collision with a bottom wall 124a of the preparation chamber 124 such that the vaporizable components in the fuel are transformed into vapor bubbles.
Tenth Embodiment Referring to
As shown in
According to the fuel supply system 70 of this embodiment, the same effects and results are obtained as in the seventh embodiment shown in
Referring to
As shown in
The jet pump 130 uses a negative pressure effect generated when the pressurized fuel introduced via the return line 100 is discharged into the reservoir cup 78 via the fuel discharge line 132. The effect permits the fuel existing outside of the reservoir cup 78 and within the fuel tank 76 to be drawn into the fuel suction line 131 so as to flow in the jet pump 130 via the fuel suction port (not shown) such that the fuel is fed into the reservoir cup 78 via the fuel discharge line 132. The basic configuration of the jet pump 130 is well known in the art, and will not be described further herein.
Twelfth Embodiment Referring to
As shown in
The jet pump 130 uses a negative pressure effect generated when the pressurized fuel introduced via the vapor discharge line 134 is discharged into the reservoir cup 78 via the fuel discharge line 132. The effect permits the fuel existing outside of the reservoir cup 78 and within the fuel tank 76 to be drawn from the fuel suction line 131 so as to flow in the jet pump 130 via the fuel suction port (not shown) such that the fuel is fed into the reservoir cup 78 via the fuel discharge line 132. The jet pump 130 is driven by the fuel coming through the motor-portion fluid path 48 in the fuel pump 10 so as to transfer fuel from outside of the reservoir cup 78 into the reservoir cup 78 within the fuel tank 76. According to the fuel supply system 70 of this embodiment, the same effects and results are obtained as in the eleventh embodiment shown in
Referring to
As shown in
Referring to
As shown in
The jet pump 130 uses a negative pressure effect generated when the pressurized fuel introduced via the in-tank fuel supply line 86 is discharged into the reservoir cup 78 via the fuel discharge line 132. The effect permits the fuel existing outside of the reservoir cup 78 and within the fuel tank 76 to be drawn into the fuel suction line 131 so as to flow in the jet pump 130 via the fuel suction port (not shown) such that the fuel is fed into the reservoir cup 78 via the fuel discharge line 132. The jet pump 130 is driven by the fuel coming through the pump-portion fluid path 47 in the fuel pump 10 so as to transfer fuel from outside of the reservoir cup 78 into the reservoir cup 78 within the fuel tank 76.
Fifteenth Embodiment Referring to
As shown in
The jet pump 130 uses a negative pressure effect generated when the pressurized fuel introduced via the vapor discharge line 139 is discharged into the reservoir cup 78 via the fuel discharge line 132. The effect permits the fuel existing outside of the reservoir cup 78 and within the fuel tank 76 to be drawn from the fuel suction line 131 so as to flow in the jet pump 130 via the fuel suction port (not shown) such that the fuel is fed into the reservoir cup 78 via the fuel discharge line 132. The jet pump 130 is driven by the fuel coming through the pump-portion fluid path 47 in the fuel pump 10 so as to transfer fuel from the outside of the reservoir cup 78 into the reservoir cup 78 within the fuel tank 76. According to the fuel supply system 70 of this embodiment, the same effects and results are obtained as in the fourteenth embodiment shown in
The invention has been described in detail with particular reference to certain representative embodiments thereof, but it will be understood that variations and modifications may be effected within the spirit and scope of the invention.
For example, the motor-integrated pump 10 of the present invention is widely applicable to fluid other than fuel. Also, the present invention is applicable to a multistage motor-integrated pump 10, which includes a plurality of impellers 37. Further, the present invention is applicable to a motor-integrated pump 10, which is of a type other than Westco type, e.g. axial flow type, gear type, and the like. Further, the fuel supply system 70 of the present invention is applicable not only to a returnless system but also to a return system, which permits excess fuel discharged from a regulator valve disposed on the engine side to be returned into a fuel tank. Further, the reservoir cup 78 may be omitted because it is provided as needed. Further, the return line 100 may be omitted because it is provided as needed. Further, the fluid flowing through the motor-portion fluid path 48 may be substituted by fluid other than fuel. Further, at least one of the inlet, outlet, inflow, and outflow ports of the fuel pump 10 may be plurally provided.
Claims
1. A motor-integrated pump, comprising:
- a pump portion for drawing fluid thereinto, pressurizing and then discharging the fluid therefrom, said pump portion including a pump-portion fluid path permitting the fluid to flow through the pump portion; and
- a motor portion for driving the pump portion, said motor portion including a motor-portion fluid path independent of the pump-portion fluid path so as to permit fluid to be introduced into the motor portion.
2. The motor-integrated pump as in claim 1, wherein the motor portion includes a brush-type DC motor having a commutator and brushes slidingly contacting with each other such that the fluid introduced into the motor-portion fluid path is directed toward the sliding contacts between the commutator and the brushes.
3. The motor-integrated pump as in claim 1, wherein the motor portion further includes a non-contacting, brushless motor.
4. The motor-integrated pump as in any one of claims 1, wherein the motor portion further includes a rotor such that the fluid introduced into the motor-portion fluid path flows in the direction of the rotor rotation.
5. A fuel supply system, comprising:
- a fluid pump, said fluid pump having an inlet member and an outlet member for bringing fluid in and out;
- a filter positioned adjacent the inlet member of the fluid pump; and
- a motor, said motor having an inlet member and an outlet member for bringing fluid in and out,
- wherein the outlet member of the fluid pump is connected to the inlet member of the motor.
6. The fuel supply system as in claim 5, further comprising a regulator valve, wherein the regulator valve is positioned between and connected to the fluid pump outlet member and the motor inlet member.
7. The fuel supply system as in claim 6, wherein the regulator valve is positioned on the motor.
8. The fuel supply system as in claim 5, further comprising a vapor discharge device.
9. The fuel supply system as in claim 8, wherein the vapor discharge device includes a vapor discharge member positioned on the motor.
10. The fuel supply system as in claim 8, wherein the vapor discharge device is positioned between the motor outlet member and the filter.
11. The fuel supply system as in claim 10, wherein the vapor discharge device includes a preparation chamber, a separation chamber, a vapor discharge member and a vapor separating filter, further wherein the vapor separating filter is connected to the filter.
12. The fuel supply system as in claim 5, further comprising a jet pump.
13. The fuel supply system as in claim 12, wherein the jet pump is connected to the motor outlet member.
14. The fuel supply system as in claim 13, wherein the jet pump is positioned on the motor.
15. The fuel supply system as in claim 12, wherein the motor includes a vapor discharge member, further wherein the jet pump is connected to the vapor discharge member.
16. The fuel supply system as in claim 12, wherein the jet pump is connected to the fluid pump outlet member.
17. The fuel supply system as in claim 5, wherein the filter includes a multilayered filter.
18. The fuel supply system as in claim 17, wherein the multilayered filter includes an outer layer having a coarse filter and an inner layer having a fine filter.
19. The fuel supply system as in claim 6, further comprising a plurality of sealing members, wherein at least one of the plurality of sealing members is positioned adjacent the fluid pump outlet member, the regulator valve, and the motor inlet member.
20. A fuel system for providing fuel to an engine, the fuel system comprising:
- a fuel supply line for supplying fuel to the engine; and
- a motor-integrated pump means having a pump portion and a motor portion, the motor-integrated pump means being able to direct fuel from the pump portion to the fuel supply line prior to the fuel interacting with the motor portion, and further to direct any excess fuel to the motor portion.
Type: Application
Filed: Jun 15, 2006
Publication Date: Dec 28, 2006
Inventor: Masaki Ikeya (Aichi-ken)
Application Number: 11/453,201
International Classification: F04D 5/00 (20060101);