WO2007004676A1

WO2007004676A1 - Fuel pump

Info

Publication number: WO2007004676A1
Application number: PCT/JP2006/313414
Authority: WO
Inventors: Takao Ikarugi; Shinichiro Horisoko; Keizo Hayama; Katsutoshi Ito; Bunji Homma; Hideyuki Iwamoto; Masahiko Narushima
Original assignee: Mitsuba Corporation; Honda Giken Kogyo Kabushiki Kaisha
Priority date: 2005-07-06
Filing date: 2006-07-05
Publication date: 2007-01-11
Also published as: CN101238284A; CN101238284B; JP4939412B2; JPWO2007004676A1; BRPI0612100A2; BRPI0612100B1

Abstract

A fuel pump enabling a reduction in the size of a fuel feeder and a simplification in the structure thereof. The fuel pump (1) comprises a pump part (P) disposed on the lower part of a cylindrical yoke (3) and a brush type motor part (M) disposed on the upper part of the yoke (3) and driving the pump part (P). A pump bracket (10) covering the pump part (P) side end part of the yoke (3) comprises a fuel suction part (10c) sucking a fuel into the pump part (P) and a fuel discharge part (10d) discharging the fuel to the outside of the pump part (P).

Description

Specification

Fuel pump

Technical field

[0001] The present invention belongs to the technical field of fuel pumps mounted on vehicles such as motorcycles.

Background art

[0002] —Generally, some of the fuel pumps constituting the fuel supply device for this type of vehicle are configured such that the fuel pump is provided at the bottom of the fuel tank and the fuel pump is driven while immersed in the fuel. There is an in-tank type. In this case, the fuel pump is configured such that the pump portion is disposed below the cylindrical case body, and the motor portion that drives the pump portion is disposed above the case body, so that the fuel in the fuel tank is reduced. It also enables fuel supply.

[0003] By the way, as a motor unit used in a fuel pump, an electric power source is configured such that a commutator is provided on a motor shaft, an external power supply is supplied via a brush that is in sliding contact with the commutator, and thereby the motor shaft is rotated. There is a type using a motor, and in such a type, a fuel discharge part is provided on the motor part side (Patent Document 1).

When a fuel pump using such a motor unit is incorporated in an in-tank fuel supply device, the fuel discharge unit is provided with the fuel tank facing upward, so that a fuel tank is used using a pipe connected to the discharge unit. It will be pulled out from the inside and guided to the engine side (Patent Document 2).

Patent Document 1: JP-A-10-47291

Patent Document 2: Special Publication 2003/044357

Disclosure of the invention

Problems to be solved by the invention

However, in the conventional fuel pump, the fuel discharge part is provided on the motor part side, and the flow path of the fuel sucked into the case body is the inside of the case body of the fuel pump, that is, the motor. It is configured to pass between the rotor constituting the part and the case body to reach the bracket on the motor part side. For this reason, the permanent magnets arranged on the inner periphery of the case body and the rotor There is a problem that a fuel flow path must be ensured between the outer periphery and the motor unit is made compact, that is, there is a limit to the compactness of the fuel pump.

In addition, when a fuel pump equipped with such a motor unit is incorporated into an in-tank fuel supply device, the discharge unit is positioned in the fuel tank in a posture facing upward. For this reason, piping that leads from the discharge part to the engine side, drawn from the upper part of the fuel tank to the outside, must be routed toward the engine side. For this reason, if the fuel flow path becomes longer through the inside and outside of the fuel tank, the pressure loss increases, and accordingly, the output of the fuel pump has to be increased and the compactness of the fuel pump is impaired. There is also a problem that the piping that connects the inside and outside of the fuel tank by force is required, the number of parts increases, and the structure to connect by force becomes complicated as the fuel supply device becomes larger. There are issues to be addressed.

Means for solving the problem

The present invention has been created in view of the above-described circumstances for the purpose of solving these problems. The invention of claim 1 is directed to a fuel pump provided at the bottom of a fuel tank. In configuring the pump part built in the lower part and the motor part built in the upper part of the case body and driving the pump part, a fuel suction part for sucking fuel into the pump part is provided on the pump part side of the case body. The fuel discharge part for discharging the fuel to the outside of the pump part is formed in the vertical direction.

The invention of claim 2 is the fuel pump according to claim 1, wherein the fuel pump is supported in the fuel tank via a pump stay, and the pump stage communicates with the fuel tank and is below the bottom of the fuel tank. A fuel supply part is formed which stores fuel and supplies it to the suction part.

The invention of claim 3 is the fuel supply unit according to claim 2, wherein the fuel supply unit is provided with a fuel filter, and the fuel from the fuel tank is filtered and stored. A fourth aspect of the present invention is the pump stage according to any one of the second or third aspects, wherein the pump stage is formed with a guide path for guiding the fuel discharged from the fuel discharge portion to the outside.

The invention of claim 5 provides the pump stage according to any one of claims 2, 3 and 4. The force bra portion connected to the external power source is formed so as to protrude downward from the bottom of the fuel tank.

A sixth aspect of the present invention is the motor unit according to any one of the first to fifth aspects, wherein the motor portion is constituted by a brush type electric motor.

The invention's effect

[0006] With the invention of claim 1, the fuel pump can be made compact, the piping to the engine side can be shortened, and the configuration can be simplified.

With the invention of claim 2, the number of parts can be reduced and the configuration can be simplified, while the fuel supply to the fuel pump can be performed stably and reliably.

According to the invention of claim 3, a fuel filter having a large force can be used without separately providing a space for disposing the fuel filter, and a more excellent fuel pump can be obtained.

With the invention of claim 4, the configuration of the flow path to the engine side can be simplified, and the fuel supply device can be downsized.

According to the invention of claim 5, the configuration of the fuel supply device can be further simplified and compactness can be achieved.

Brief Description of Drawings

FIG. 1 is a cross-sectional front view of a fuel pump.

FIG. 2 is a perspective view of a partition plate.

Explanation of symbols

[0008] 1 Fuel pump

2 Fuel tank

2a base

2b Through hole

3 York

5 Armature

5a Armature axis

6 Commutator 7 Brush

8 Permanent magnet

9 Lower bracket

10 Pump bracket

10c Fuel inlet

lOd Fuel outlet

11 Impeller

13 Pump stay unit

13c piece

13f Fuel supply unit

13g fuel taxiway

14 Partition plate

15 Fuel filter

17 Pressure regulator

BEST MODE FOR CARRYING OUT THE INVENTION

Next, embodiments of the present invention will be described with reference to the drawings.

In the drawings, reference numeral 1 denotes a fuel pump constituting a fuel supply device. The fuel pump 1 is attached to a fuel tank 2 to be described later, and is a pump part P located below the bottom 2a side of the fuel tank 2 And a motor part M above the pump part P. The motor part M and the pump part P are configured to include a cylindrical yoke 3 that constitutes the case body of the present invention, and an upper step 3a is formed on the cylindrical end surface of the upper end of the yoke 3. An outer peripheral edge portion of the ring-shaped upper bracket 4 constituting the upper end portion of the case body is caulked to the upper step portion 3a.

[0010] Reference numeral 5 denotes a armature constituting the motor part M, and the upper end of the armature shaft (motor shaft) 5a constituting the armature 5 is a bearing part recessed in the shaft core part of the upper bracket 4 It is rotatably supported by 4a. Further, the force with which the commutator 6 is physically fitted to the upper end portion of the armature shaft 5a is connected to the outer peripheral surface of the resin ring-shaped portion 6a with the conductive commutator piece 6b surrounding it. Configured to be provided in multiple directions Has been. On the other hand, a pair of brush holders 4b are formed in the circumferential direction on the lower end surface of the upper bracket 4, and the brushes 7 biased toward the inner diameter side are respectively applied to the brush holder 4b. The tip end surface of each brush 7 on the inner diameter side is set so as to abut on the commutator piece 6b in a resilient manner. In addition, a plurality of ring-shaped core members 5b are externally fitted below the outer fitting portion of the commutator 6 of the armature shaft 5a. A plurality of coils 5c conducting to the commutator piece 6b are provided, and thereby the armature 5 is configured.

Reference numeral 8 denotes a pair of permanent magnets fixed to the inner peripheral surface of the yoke 3 facing the armature 5 at a predetermined interval in the circumferential direction. The permanent magnet 8 and the outer surface of the armature 5 are fixed to each other. The circumferences are set so as to be close to each other.

[0011] Further, the lower end 5d of the armature shaft 5a has a through hole 9a formed in the shaft core portion of the ring-shaped lower bracket 9 fixed to the lower end portion of the leg yoke 3 constituting the pump portion P. And is rotatably supported by a bearing 9b disposed in the through hole 9a. Then, as will be described later, by supplying an external power source to the brush 7, the coils 5c are excited via the commutator piece 6b, whereby the armature core 5 has a magnetic pole formed by the permanent magnet 8. It is set to rotate in the yoke 3.

[0012] The outer peripheral edge portion of the lower bracket 9 is disposed in abutting manner below the lower bracket 9, and together with the outer peripheral edge portion of the pump bracket 10 constituting the lower end portion of the case body of the present invention. A lower step 3b formed on the yoke 3 is caulked and the lower bracket 9 and the pump bracket 10 constitute a pump part P.

A recess 9c that opens downward is formed on the lower surface of the lower bracket 9, and the lower bracket 9 abuts the pump bracket 10 against the outer peripheral edge of the outer diameter side of the recess 9c. A pump chamber PR is formed between the bracket 9 and the pump bracket 10. A lower end portion 5d of the armature shaft 5a that protrudes downward through the through hole 9a of the lower bracket 9 protrudes into the pump chamber PR, and the protruding lower end portion 5d has an outer peripheral edge portion. The impeller 11 formed with the blade portion 11a is supported in a penetrating manner by being fitted with a key, so that the impeller 11 is set to rotate as the motor portion M is driven. Yes. [0013] Further, on the outer diameter side of the concave portion 9c of the lower bracket 9, a ring-shaped concave portion 9d serving as a fuel flow path is formed facing the blade portion 11a of the impeller 11, and the ring shape A motor part-side discharge part 9e that opens between the motor part M and the pump part P and communicates with the recess 9d in the vertical direction is provided. On the other hand, the upper surface of the pump bracket 10 is formed with a recess 10a that protrudes into the pump chamber PR and loosely fits the lower end portion 5d of the armature shaft 5a that supports the impeller 11 in a non-rotating manner, and the impeller blade portion 11a A ring-shaped recess 10b serving as a fuel flow path is formed facing the (lower bracket ring-shaped recess 9e). Furthermore, a cylindrical hole fuel suction portion 10c that penetrates in the vertical direction in a state of communicating with the ring-shaped recess 10b and sucks fuel is formed, and is located at a different circumferential position from the fuel suction portion 10c. In addition, a cylindrical fuel discharge portion 10d that penetrates in the vertical direction while communicating with the ring-shaped recess 10b and protrudes downward to discharge the fuel to the outside is formed.

12 is a check valve provided in the fuel discharge section 10d. The check valve 12 includes a bottomed cylindrical valve body 12a and a through-hole 12b opened at the bottom located above the valve body 12a. A spherical valve body 12c for sealing, and when the pressure of the fuel discharged from the fuel discharge portion 10d reaches a predetermined pressure, the valve body 12c opens the through hole 12b of the valve body 12a, and the fuel Is set to discharge to the discharge guiding path 13g side described later. Note that the check valve 12 is arranged so as to be movable in the vertical direction in the fuel discharge part 10d, and has a function as a relief valve, so that the fuel in the pipe connected to the discharge guiding path 13g side can be When the temperature becomes high and the pressure becomes high, the valve body 12a is displaced upward to reduce the fuel pressure on the discharge guiding passage 13g side.

On the other hand, a ring-shaped through hole 2b is formed in the bottom 2a of the fuel tank 2, and the through hole 2b is provided with a pump stay unit (corresponding to the pump stage of the present invention) 13. It is set to be sealed with. The pump stay unit 13 has a function of supporting the fuel pump 1 in the fuel tank 2.

That is, a bottomed cylindrical portion 13a is formed at a lower portion of the pump stay unit 13, and a flange portion 13b protruding to the outer diameter side is formed on the outer peripheral surface of the bottomed cylindrical portion 13a. ing. Then, the flange portion 13b is fixed by abutting against the fuel tank through hole 2b. By doing so, the bottomed cylindrical portion 13a is set so as to cover the fuel tank penetration 2a in a sealed manner, and in this state, the bottomed cylindrical portion 13a is disposed so as to protrude below the fuel tank 2. It is structured to be done.

Further, the pump stay unit 13 has a predetermined gap in the circumferential direction from the upper cylinder end of the bottomed cylindrical part 13a which is an upper part of the flange part 13b and is a part fitted into the fuel tank 2. A plurality of stage pieces 13c extending upward are formed as a body, and a fixed piece 13d bent toward the inner diameter side is formed at the upper end of these stage pieces 13c. Then, the pump stay unit 13 fixes the fixed piece 13d to the upper bracket 9 of the fuel pump 1 disposed in the fuel tank 2, so that the stage piece 13c is in close proximity to the yoke 3 and the fuel pump 1 The fuel pump 1 is fixedly supported in a standing posture in which the pump part P is in the lower side in the fuel tank 2.

[0015] Further, on the inner peripheral surface of the bottomed cylindrical portion 13a protruding outward (downward) from the fuel tank 2 of the pump stay unit 13, a step portion 13e having a small diameter on the lower side is formed. A disc-shaped partition plate 14 is fixed to the stepped portion 13 3e in a sealing and abutting manner, so that the partition plate 14 partitions the inside of the bottomed cylindrical portion 13a vertically. Is set. Here, the partition plate 14 is disposed below the bottom side 2a of the fuel tank 2, and faces the pump bracket 10 of the fuel pump 1 supported upright by the step piece 13c and the fixed piece 13d. It is set to be.

The partition plate 14 is provided with a fuel finisher 15, and the fuel flowing from the upper side of the partition plate 14 to the bottomed cylindrical portion 13 a side through the through hole 2 b of the fuel tank bottom 2 a is disposed in the fuel filter 15 installation portion. Accordingly, the lower portion of the bottomed cylindrical portion 13a partitioned by the partition plate 14 is a fuel supply portion 13f in which fuel filtered by the fuel filter 15 is stored. It is configured.

[0016] A cylindrical suction guide passage 14a is formed on the outer diameter side portion of the partition plate 14 facing the pump bracket 10 so as to face the fuel suction portion 10c and project upward. The suction guide passage 14a is formed in communication with the fuel supply portion 13f through a through hole 14b provided in the partition plate 14, and the projecting tip of the suction guide passage 14a has the above-described fuel. The pump 1 is connected by sealing it into the cylindrical fuel suction part 10c. It is. As a result, as the impeller 11 of the fuel pump 1 rotates, the fuel suction portion 10c is supplied with the filtered fuel stored in the fuel supply portion 13f via the suction guide passage 14a. It is structured as follows.

Further, on the outer diameter side of the partition plate 14, a discharge through hole 14 c is formed on the outer diameter side located at a portion facing the fuel discharge portion 10 d of the pump bracket 10. The discharge through hole 14c is configured as a through hole that vertically penetrates the partition plate 14, and is set so that the fuel discharge portion 10d on the fuel pump 1 side penetrates in a sealed manner. Then, the penetrating tip of the fuel discharge portion 10d fitted into the discharge through-hole 14c is sealed with a discharge guide passage (corresponding to the guide passage of the present invention) 13g formed in the bottomed tubular portion 13a. It is set to fit into the shape. The discharge guiding path 13g is partitioned from the fuel supply part 13f formed in the bottomed cylindrical part 13a, and is formed adjacent to the fuel supply part 13f. The bottom side of the bottomed cylindrical part 13a It is formed so as to extend toward the outer diameter side, and is set so that a pipe (not shown) from the engine side is connected to the extending end portion of the discharge guiding path 13g. .

[0017] Also, an external force bra (not shown) is connected to the outer peripheral portion of the bottomed cylindrical portion 13a exposed from the fuel tank 2 of the pump stay unit 13 and below the fuel tank bottom 2c. A force bra portion 13h for inputting an external power source is formed. Then, the external power input through the force bra portion 13h is transmitted through the L-shaped first terminal plate 16, the conductive plate 16a facing up and down, and the second terminal plate 16b. In addition, it is set so as to be supplied to the brush 7 disposed in the upper bracket 4 of the fuel pump 1.

[0018] Further, in the fuel pump 1 of the present embodiment, the upper bracket 4 constituting the motor unit M is provided with a pressure adjusting device 17 as an air vent means, and the pressure in the fuel pump 1 reaches a predetermined pressure. By adjusting the pressure in the fuel pump 1 by discharging the fuel in the fuel pump 1 to the fuel tank 2 side, it is possible to extract the air that has entered the fuel pump 1 to the outside. It has been done.

The pressure adjusting device 17 is provided in a recessed hole 4c formed in a recessed groove shape downward from the upper side surface of the upper bracket 4, and communicates with the bottom surface of the recessed hole 4c on the fuel tank 2 side. The through-hole 4d opened as described above, a spherical valve body 17a that closes the through-hole 4d, and the valve body 17a is elastically pressed toward the through-hole 4d, and the through-hole 4d is closed by the valve body 17a. The valve body 17c is opened when a pressure exceeding the urging force of the ammunition 17b is applied in the motor part M, and the yoke 17 is opened via the through hole 4d. The fuel in 3 is set to discharge to the fuel tank 2 side.

[0019] In the fuel pump 1 configured as described above, an external coupler connected to the force plastic portion 13h

When power is supplied to the brush 7 from the first terminal plate 16, the conductive plate 16a, and the second terminal plate 16b (not shown), the armature shaft 5a rotates, and the impeller 11 The body rotates. As a result, the fuel is sucked into the pump part P through the fuel suction part 1 Oc stored in the fuel supply part 13f in a filtered state from the fuel tank 2. The sucked fuel flows through the lower bracket ring-shaped concave portion 9d and the pump bracket ring-shaped concave portion 10b formed in the opposite portion of the impeller blade portion 11a as a flow path, and the upper bracket 9 discharge portion on the motor side. 9e and the fuel discharge part 10d of the pump bracket 10 are set to be guided to the engine side via the fuel guide path 13g. At this time, the pressure adjusting device 17 is in a closed state, and is opened when the pressure in the fuel pump 1 increases, and the fuel is discharged to the fuel tank 2 side, and the pressure in the fuel pump 1 is appropriately adjusted. It is set to adjust.

[0020] In this case, the fuel stored in the fuel supply unit 13f moves as a flow path from the fuel suction unit 10c formed in the pump bracket 10 of the pump unit P to the fuel discharge unit 10d. Therefore, a fuel flow path is not formed between the inner peripheral surface of the yoke 3 (permanent magnet 8) of the motor part M and the armature 5, so that the yoke 3 (permanent magnet) of the motor part M is formed. 8) The gap between the inner peripheral surface and armature 5 can be set as small as possible, and the fuel flow path is only at the pump part P, so the pressure loss can be reduced accordingly. Has been. Further, the fuel discharge part 10d is guided to the engine side through a fuel guide path 13g arranged adjacent to the fuel supply part 13e of the pump stay unit 13, and thus, Unlike the fuel supply device, the piping from the fuel discharge part of the fuel pump to the engine side does not need to be a complicated configuration that is pulled out from the fuel tank in a sealed manner, and the fuel supply device can be made compact. Configured as Yes.

[0021] In the present embodiment configured as described, the fuel pump 1 constituting the fuel supply device is configured such that the brush 7 is in sliding contact with the commutator 6 provided on the armature shaft 5a, and the outer periphery of the armature 5; The inner peripheral surface of the permanent magnet 8 provided on the inner peripheral surface of the yoke 3 is provided close to each other. In this case, since the fuel pump 1 is formed in a standing manner in the pump bracket 10 of the pump part P located on the lower side so that the fuel suction part 10c faces in the vertical direction, the fuel pump 1 Since the fuel discharge portion 10d is also formed in the pump bracket 10, the motor portion M side is filled with fuel, but the yoke 3, that is, the permanent magnet 8 is The outer periphery of the armature 5 and the inner peripheral surface of the yoke 3 are provided close to each other, as it is not necessary to form a flow path between the inner peripheral surface of the fixed yoke 3 and the outer surface of the armature 5. As a result, the fuel pump 1 can be made compact.

In this case, since the fuel discharge part 10d is formed on the pump part P side (downward), the piping configuration for forming the flow path to the engine side is made to penetrate through the inside and outside of the fuel tank 2. It is not necessary to provide any piping that leads to the outside, and the fuel flow path from the fuel discharge part 10d to the engine side can be shortened, so that not only the number of parts can be reduced but also the pressure loss can be reduced. The fuel supply device can be made more compact and the fuel tank 2 can be made more compact.

In this case, since the pressure adjusting device 17 is provided within the diameter of the pump part P, further compactness can be achieved.

Further, in the embodiment of the present invention, the fuel pump 1 is supported in the fuel tank 2 by the step piece 13c and the fixed piece 13d of the pump stay unit 13, and in this case, the pump stay unit 13 covers the through hole 2b of the bottom 2a of the fuel tank 2 in a sealing manner, and a bottomed cylindrical portion 13a is formed below the fuel tank bottom 2a. A fuel supply portion 13f that stores fuel to be supplied to the fuel suction portion 10c of the fuel pump 1 is formed in the bottomed cylindrical portion 13a. As a result, there is no need to separately provide a steering member for supporting the fuel pump 1 and the fuel supply unit, and the number of parts can be reduced and the configuration can be simplified. Moreover, the fuel supply unit 13f is lower than the fuel tank 2. Therefore, it is possible to supply the fuel pump 1 with fuel that will not be affected even if the oil level in the fuel tank 2 changes, and to ensure that the fuel in the fuel tank 2 is low Therefore, the fuel can be supplied to the fuel pump 1 in a stable manner. In addition, since the amount of effective fuel in the fuel tank 2 can be increased, the fuel tank 2 can be further reduced in size.

[0023] Further, in this apparatus, the fuel supply unit 13f is provided with the fuel filter 15 so that the fuel from the fuel tank 2 is filtered and stored in the fuel supply unit 13f. It is not necessary to secure a separate installation space, and the shape of the fuel filter 15 can be increased in accordance with the size of the fuel supply section 13f. S can.

[0024] In this case, the pump stay unit 13 is formed with a fuel guide path 13g as a fuel flow path from the fuel discharge portion 10d in the body, so that a flow path to the engine side is provided. Therefore, it is possible to reduce the size of the fuel supply system, which makes piping for the installation easy and does not require a complicated configuration.

[0025] In addition, in this device, since the force bra portion 13h for connecting an external force bra for supplying external power to the brush 7 is formed on the pump stay unit 13, the fuel supply device This can further simplify the configuration and contribute to downsizing.

[0026] The present invention is of course not limited to the above-described embodiment, and the motor portion may be configured to use a brushless type electric motor. Even in this case, the motor portion is disposed on the inner peripheral surface of the yoke. In addition, the distance between the inner peripheral surface of the stator coil and the outer peripheral surface of the rotor can be reduced to achieve compactness, and the fuel flow path can be shortened.

Industrial applicability

[0027] The present invention is useful for a fuel pump mounted on a vehicle such as a motorcycle, and it is not necessary to form a fuel flow path in the yoke. Therefore, the yoke inner peripheral surface and the armature outer surface are brought close to each other. In addition, it is possible to shorten the fuel flow path that does not need to be provided through the inside and outside of the piping structure for forming the fuel flow path to the engine side, so the number of parts can be reduced. Therefore, the pressure loss caused by the force can be reduced, and the fuel supply device and the fuel tank can be made compact.

Claims

The scope of the claims

[1] The fuel pump provided at the bottom of the fuel tank is composed of a pump part built in the lower part of the case body and a motor part built in the upper part of the case body to drive the pump part. A fuel pump characterized in that a fuel suction portion for sucking fuel into the pump portion and a fuel discharge portion for discharging fuel to the outside of the pump portion are formed on the pump portion side of the case body in the vertical direction. .

[2] In claim 1, the fuel pump is supported in the fuel tank via a pump stay, and the pump stage communicates with the fuel tank and is located below the bottom of the fuel tank. A fuel pump is provided with a fuel supply part that stores and supplies the fuel to the suction part.

[3] The fuel pump according to claim 2, wherein the fuel supply unit is provided with a fuel filter, and the fuel from the fuel tank is filtered and stored.

[4] The fuel pump according to any one of claims 2 and 3, wherein the pump stage is formed with a guide path that guides the fuel discharged from the fuel discharge portion to the outside.

[5] The fuel pump according to any one of claims 2, 3, and 4, wherein a force bra connected to an external power source is formed on the pump stage so as to protrude downward from the bottom of the fuel tank.

6. The fuel pump according to any one of claims 1 to 5, wherein the motor unit is configured by a brush-type electric motor.