JP2007315255A - Fuel supply system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel supply system capable of lessening noises leaked out from a pump. <P>SOLUTION: The fuel supply system comprises the pump 16, a pump support member 22 for supporting the pump 16 in the inside of a fuel tank 18, and a filter member 54 for removing foreign substances from the fuel. The pump 16 includes a pump operation section 50b which performs supply of the fuel, and a motor section 50a for driving the pump operation section 50b. The pump operation section 50b and motor section 50a are covered by the filter member 54 and pump support member 22. The route for transmitting operational noises starts from the inside toward the outside of the filter member 54. The cross section of the transmitting route is complicatedly changed while sound waves are being transmitted from the inside to the outside in the route. An intake area of the filter member 54 also becomes large since the filter member 54 covers the whole area of the pump operation section 50b and motor section 50a. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel supply system, and more particularly to a structure around a pump.

Among fuel supply systems for supplying fuel to an engine, those that handle dimethyl ether (C ₂ H ₆ O, hereinafter referred to as DME) as a fuel have a pump for pumping the fuel from the fuel tank to the fuel injection device. May include.
In the suction portion of such a pump, a filter is provided in order to prevent suction of foreign matter existing in the fuel tank. This filter is attached in a bag shape to the tip of a suction pipe extending outward from the pump.
An example of such a fuel supply system is shown in Patent Document 1.

JP-A-10-67237

However, the conventional fuel supply system as shown in Patent Document 1 has a problem that noise leaking outside the pump is large.
The noise referred to here includes that caused by pump operating noise and that caused by cavitation caused by a decrease in pressure near the pump inlet due to filter clogging or the like. In particular, in the configuration having a bag-like filter at the tip of the suction pipe as in Patent Document 1, the suction area of the filter is small and clogging is likely to occur.

  The present invention has been made to solve such problems, and an object of the present invention is to provide a fuel supply system that reduces noise leaking outside the pump.

  In order to solve the above problems, a fuel supply system according to the present invention includes a fuel tank, a pump that supplies fuel from the fuel tank to an external internal combustion engine, and a pump support member that supports the pump inside the fuel tank. The pump is supported by a pump support member, and includes a pump action part that supplies fuel, a motor part that drives the pump action part, and a filter member for removing foreign matter from the fuel. The filter member has a bottomed cylindrical shape having an open end on one side and a bottom on the other side. The filter member is attached to the pump support member at the open end, and is pumped by the filter member and the pump support member. And the motor part are covered.

Since the bottomed cylindrical filter member covers the entire pump action part and the motor part, the path through which the operating sound propagates is a path from the inside to the outside of the filter member. In this path, as the sound wave propagates from the inside to the outside, the cross-sectional area of the propagation path changes in a complicated manner.
Further, since the filter member covers the entire pump action portion and the motor portion, the suction area of the filter member is large and clogging is unlikely to occur.

The filter member may include a mesh-like filter and a filter frame that supports the filter and has an opening.
The filter member includes a lid portion constituting the bottom portion and a cylindrical filter portion having both ends opened. Between the filter portion and at least one of the lid portion and the pump support member, a gap therebetween is provided. A seal ring for sealing may be arranged.
The filter member may include a bottomed cylindrical filter portion having an open end on one side, and a seal ring that seals between the open end of the filter portion and the pump support member may be disposed.
The pump may include a relief valve, and when the pressure in the pump action unit reaches a predetermined value, the relief valve may return the fuel in the pump action unit to the fuel tank without passing through the filter member.

According to the present invention, in the fuel supply system, the pump support member and the filter member cover the entire pump action portion and the motor portion, so that the cross-sectional area of the propagation path of the operating sound generated in the pump body changes in a complex manner. For this reason, the operating sound of the pump leaking to the outside of the pump can be reduced, and the noise can be reduced.
Moreover, since the suction area of the filter member is large, cavitation due to clogging of the filter can be prevented, and noise due to cavitation can be prevented.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
Embodiment 1 FIG.
1-4 is a figure which shows the structure of the fuel supply apparatus 10 which concerns on Embodiment 1 of this invention.
FIG. 1 shows a configuration including the entire fuel supply apparatus 10.

A fuel injection device 14 for supplying fuel to the engine 12 is attached to the engine 12 which is an internal combustion engine. The fuel supply device 10 supplies fuel to the fuel injection device 14 and is connected to the fuel injection device 14 via a pipe 20.
The fuel supply device 10 includes a fuel tank 18 that stores fuel, and a pump 16 that is provided in the fuel tank 18 and that pumps fuel from the fuel tank 18 to a pipe 20.

A circular pump mounting opening 18 a is provided on the bottom surface of the fuel tank 18. The fuel supply device 10 includes a pump mounting plate 22 that is a pump support member. The pump mounting plate 22 closes the pump mounting opening 18a from the outside of the fuel tank 18, that is, from below, and supports the pump 16 inside the fuel tank 18. . The pump mounting plate 22 is fixed to the fuel tank 18 by bolts 24.
The pump 16 includes a suction port 32 that sucks fuel in the fuel tank 18, and a discharge port 30 is attached to the pump mounting plate 22. The pump 16 pumps the fuel sucked from the suction port 32 to the pipe 20 through the discharge port 30.

The pump mounting plate 22 is provided with a relief valve 34 inside the fuel tank 18 for protecting the pump 16 from high pressure above a certain level. Although the relief valve 34 is normally closed, it opens when the pressure in the pump action part 50b (see FIG. 2) reaches a certain value, and the high pressure fuel in the pump action part 50b is returned to the fuel tank 18 to return to the pump 16. The internal pressure is lowered to prevent deterioration and breakage of the pump 16. Such an abnormal high pressure may occur, for example, when the pump 16 is started.
The pump 16 acts as a pressurizing means for the fuel injection device 14, and the pressurization is usually a pressure higher than the saturation pressure of the fuel when the fuel injection device 14 is at a high temperature, that is, the fuel. It is made to the pressure where no vaporization occurs. When the fuel is DME, this pressurization is performed to about 3 MPa, for example. In this case, the pressure at which the relief valve 34 opens is, for example, 3.5 MPa.

FIG. 2 shows an enlarged cross-sectional view of the pump 16 of FIG. 1 and its surroundings. The pump 16 includes a pump body 50 and a bottomed cylindrical filter member 51 for removing foreign matters and the like from the fuel before the fuel is sucked from the suction port 32.
The filter member 51 includes a cylindrical filter portion 54 having a thickness and an opening end on both sides as a cylindrical portion. In addition, the filter member 51 includes a motor plate 52 that is a lid portion attached to one open end of the filter portion 54. The motor plate 52 is attached above the pump body 50, that is, in the direction toward the inside of the fuel tank 18. The motor plate 52 has a disc shape and is made of an aluminum material.
The filter unit 54 is mounted between the pump mounting plate 22 and the motor plate 52 so as to cover the pump main body 50, and defines an inner space 18b of the fuel tank 18 that is the outer side and an intake space 16b that is the inner side. To do.
The pump main body 50 includes a gear housing 58 attached to the pump attachment plate 22 and a motor housing 56 attached to the gear housing 58.

Of the pump main body 50, the gear housing 58, the pump mounting plate 22, and the inside thereof constitute a pump action unit 50 b that supplies fuel to the fuel injection device 14. The suction port 32 described above is provided in the gear housing 58.
Further, in the pump body 50, a portion between the joint portion of the motor housing 56 and the gear housing 58 and the joint portion of the motor housing 56 and the motor plate 52 is a motor portion 50a that drives the pump action portion 50b. That is, the motor unit 50a is disposed in the fuel tank 18 in the inner direction than the pump action unit 50b.
The motor plate 52 is fixed and supported on the motor housing 56 by bolts 48. Further, the motor housing 56, the gear housing 58, and the pump mounting plate 22 are fixed together by bolts 41.

  As shown in FIGS. 1 and 2, the suction port 32 opens to the suction space 16 b and sucks the fuel that has passed through the filter member 51. The relief valve 34 is provided at a position not covered by the pump mounting plate 22 and the filter member 51, that is, in the internal space 18 b of the fuel tank 18. For this reason, the relief valve 34 returns the fuel of the pump action part 50 b to the internal space 18 b of the fuel tank 18 without passing through the filter member 51.

  A drive shaft 80 is rotatably provided inside the pump body 50. The upper end of the drive shaft 80 is received by the motor plate 52 and supported by the motor housing 56 via the bearing 90. An intermediate portion of the drive shaft 80 penetrates the gear housing 58 and is supported by the gear housing 58 via a bearing 92. A lower side of the drive shaft 80, that is, an end on the pump mounting plate 22 side, is supported by the pump mounting plate 22 via a bearing 94.

  A rotor 82 is fixed in the motor housing 56 so as to be rotatable integrally with the drive shaft 80. A stator 84 is fixed to the inner peripheral surface of the motor housing 56 so as to surround the rotor 82. Further, a coil 86 is wound around the stator 84, and when the coil 86 is energized via the terminals 26 and 28, the rotor 82 and the drive shaft 80 rotate.

  The pump action part 50 b of the pump body 50 has a gear chamber 100 that is a space between the gear housing 58 and the pump mounting plate 22. In the pump mounting plate 22, a recess 102 and a recess 104 facing the gear chamber 100 are formed, and the lower end of the bearing 94 and the drive shaft 80 described above are accommodated in the recess 102. In the gear housing 58, a recess 106 facing the gear chamber 100 is formed at a position facing the recess 104 of the pump mounting plate 22.

  In the gear chamber 100, a driven shaft 81 is disposed in which both ends are accommodated in the recess 106 of the gear housing 58 and the recess 104 of the pump mounting plate 22. The upper and lower ends of the driven shaft 81 are supported by the gear housing 58 and the pump mounting plate 22 through bearings 96 and 98, respectively. The axes of the drive shaft 80 and the driven shaft 81 are parallel.

  In the gear chamber 100, a drive gear 110 is formed around the drive shaft 80, and a driven gear 111 is formed around the driven shaft 81. The drive gear 110 and the driven gear 111 are arranged so as to mesh with each other. When the drive gear 110 rotates, the driven gear 111 rotates in the opposite direction. When the drive gear 110 and the driven gear 111 are engaged and rotated in this manner, the pump 16 pumps fuel from the suction port 32 to the discharge port 30.

  FIG. 3 is an enlarged view of a part of the joint between the fuel tank 18 and the pump mounting plate 22 in FIG. The pump mounting plate 22 and the fuel tank 18 have a stepped portion 22c and a stepped portion 18c facing each other, and a gasket is provided between the stepped portion 22c of the pump mounting plate 22 and the stepped portion 18c of the fuel tank 18. 120 is clamped. Further, an O-ring groove 18 d is formed in the fuel tank 18, and an O-ring 122 is disposed therein, and the O-ring 122 is sandwiched between the fuel tank 18 and the pump mounting plate 22 so that the inside of the fuel tank 18 is separated. Seal the outside.

4 is a cross-sectional view taken along line IV-IV in FIG. However, the cross section of the motor housing 56 and the inside thereof are not shown, and only the position of the suction port 32 is shown. Further, illustration of the outside of the filter member 51 is also omitted.
As shown in FIGS. 2 and 4, the motor housing 56 and the gear housing 58 each have a cylindrical surface-shaped small-diameter portion 56 b, 58 b having a thickness, and a flange 56 a that protrudes radially outward therefrom and accommodates the bolt 41. , 58a. Six bolts 41 are arranged at an interval of 60 ° from each other.

  As shown in FIGS. 2 and 4, the suction space 16b has a cylindrical shape having a thickness d1 that is defined by the filter member 51 and the motor housing 56 at a portion above which the flanges 56a and 58a are not formed. It includes a passage 16b1 that is a space. On the other hand, in the portion below which the flanges 56a and 58a are formed, the suction space 16b has a circumferential length d2 sandwiched by the adjacent flanges 56a and 58a in the cylindrical surface space having the thickness d1. The inter-bolt channel | path 16b2 which is a space which has is included.

The structure which supports the filter part 54 of the filter member 51 is demonstrated using FIGS.
The gear housing 58 has an annular stepped portion 58c that protrudes further outward than the flange 58a at the lower end thereof, and the stepped portion 58c supports the lower end 54b of the filter portion 54 from the inside. The pump mounting plate 22 has a protruding portion 22d (see FIG. 3) protruding upward on the outer periphery of the upper end surface thereof, and the protruding portion 22d supports the lower end 54b of the filter portion 54 from the outside.

  The motor plate 52 has an annular notch 52a on the outer periphery of the lower end, and the notch 52a supports the upper end 54a of the filter part 54 from the inside. Further, an annular ring is formed between the filter portion 54 and the motor plate 52 that contacts the filter portion 54 at the upper end 54a thereof, that is, between the upper end 54a of the filter portion 54 and the upper end 52b of the notch portion 52a. A seal ring 130 is disposed. The seal ring 130 is sandwiched between the motor plate 52 and the filter portion 54 from above and below to seal the internal space 18b of the fuel tank 18 and the suction space 16b therebetween. The seal ring 130 is an elastic body made of PTFE (polytetrafluoroethylene). The seal ring 130 may be sandwiched between the pump mounting plate 22 and the lower end 54b of the filter portion 54. Further, the seal ring 130 may be sandwiched between both the motor plate 52 and the upper end 54 a of the filter part 54 and between the pump mounting plate 22 and the lower end 54 b of the filter part 54.

  Thus, the pump mounting plate 22 covers the lower part of the pump action part 50b, and the filter part 54 covers the periphery of the pump action part 50b and the motor part 50a. The upper end of the filter unit 54 is supported by a motor plate 52 that closes the upper end of the motor unit 50a. Therefore, the pump mounting plate 22 and the filter member 51 cover the entire pump action part 50b and the motor part 50a.

Next, the configuration of the filter unit 54 will be described with reference to FIG.
FIG. 5 shows a state before the filter portion 54 is formed in a cylindrical shape. The filter portion 54 is configured by overlapping a mesh-shaped filter 54x and a filter frame 54y having a large number of communication holes 54y ′ that support the filter 54x. It is arranged to become. The filter 54x and the filter frame 54y are fixed to each other by spot welding. Moreover, the filter part 54 is formed in a cylindrical shape by welding the welded parts 54c at both ends in the circumferential direction.

  The filter 54x is configured by weaving stainless fibers extending in two directions. The diameter of the fiber is, for example, 60 μm, and the aperture ratio is, for example, about 40 to 50%. The filter frame 54y is formed of a stainless steel plate. As a specific arrangement example of the communication holes 54y ′ of the filter frame 54y, the pitch p1 in the circumferential direction and the pitch p2 in the vertical direction are each 9 mm, the communication holes 54y ′ are aligned in the circumferential direction, An arrangement that aligns in a direction that forms an angle θ, for example, 60 ° may also be mentioned. Further, the diameter of the communication hole 54y 'is, for example, 6 mm.

  When the sound wave generated by the operation of the motor unit 50a and the pump action unit 50b propagates from the inside to the outside of the filter unit 54 inside the filter unit 54, it first passes through the opening of the filter frame 54y, and then It will pass through the opening of the filter 54x. Here, as described above, the opening of the filter 54x is relatively fine, the opening of the filter frame 54y is relatively coarse, and these are arranged in an overlapping manner. For this reason, as the sound wave propagates from the inside to the outside of the filter unit 54, the cross-sectional area of the propagation path changes in a complicated manner, so that the viscous resistance of the fuel increases extremely, and the dissipation amount of the sound wave energy increases due to fluid friction. Become. That is, the sound wave is converted into thermal energy and attenuates rapidly.

  As described above, according to the fuel supply device 10 according to the first embodiment, the pump mounting plate 22 and the filter member 51 cover the entire pump action unit 50b and the motor unit 50a, and thus are generated in the pump body 50. The cross-sectional area of the propagation path of the operating sound changes in a complicated manner. For this reason, the operation sound of the pump 16 leaking to the outside of the pump 16 can be reduced, and the noise can be reduced. Accordingly, it is possible to suppress the fuel tank 18 from resonating with the operating sound.

Since the filter member 51 covers the entire pump action portion 50b and the motor portion 50a, the area of the filter member 51 is large, and therefore the total opening area is also large. For this reason, compared with a pump configured to provide a filter only around the suction port, the suction area, that is, the flow path cross-sectional area of the filter portion, is large, so that the suction resistance can be further reduced. For this reason, inhalation failure and cavitation due to filter clogging can be prevented, the filter life can be extended, and noise due to cavitation can also be prevented.
The flow path from the internal space 18b of the fuel tank 18 to the inside of the pump action portion 50b includes the filter portion 54, the passage 16b1 and the inter-bolt passage 16b2 in the suction space 16b, and the suction port 32. In particular, the inter-bolt passage 16b2 has a space between the bolts 41 as a passage. Thus, since there is no tubular structure in the filter part 54 and its periphery, the suction resistance can be further reduced.

In the prior art, there is a configuration in which a large part of the outer periphery of the pump is covered with a foaming resin for soundproofing. However, when such a configuration is applied to a pump for DME, the foamed resin deteriorates due to DME, and the noise The prevention effect cannot be expected to last. On the other hand, since the fuel supply device 10 according to the first embodiment does not use the foamed resin, the noise prevention effect can be maintained without being deteriorated in the soundproof structure due to DME.
In addition to the noise prevention effect, the filter unit 54 also has an effect of a conventional filter, that is, an effect of removing foreign matters from the fuel. For this reason, it is not necessary to separately provide a structure for sound reduction and a structure for removing foreign substances, and the structure can be simplified and the number of parts can be reduced.

Between the upper end 54a of the filter part 54 and the upper end 52b of the notch part 52a of the motor plate 52, the seal ring 130 which is an elastic body is arrange | positioned, and the tolerance between these is absorbed. For this reason, the accuracy required for the attachment of the filter unit 54 can be kept low, and the accuracy can be roughened.
Moreover, since the filter part 54 does not need to be incorporated in the pump body 50, the structure of the filter part 54 can be simplified, and the entire size of the pump 16 can be reduced. Moreover, the attachment work of the filter part 54 can also be made simple.
Furthermore, since the outer shape of the entire pump 16 is substantially cylindrical, in the operation of attaching the pump 16 to the fuel tank 18, the operation of inserting the pump 16 from the outside of the pump attachment opening 18a can be easily performed.

As shown in FIG. 1, the relief valve 34 is provided on the outer periphery of the pump mounting plate 22, and thus opens to the internal space 18 b of the fuel tank 18 instead of the suction space 16 b inside the filter member 51. That is, the relief valve 34 is provided outside the space covered by the pump mounting plate 22 and the filter member 51.
For this reason, even when the relief valve 34 is opened and high-pressure fuel is blown out, this fuel is not blown into the filter portion 54 from the inside, so that deterioration and breakage of the filter portion 54 can be prevented. .

In the first embodiment described above, the filter unit 54 includes the filter 54x and the filter frame 54y. However, as a modification, the filter unit 54 may not include the filter frame 54y but may have a configuration including only the filter 54x.
Even in such a configuration, as the sound wave propagates from the inside to the outside of the filter 54x, the cross-sectional area of the propagation path changes, so that a certain noise prevention effect can be maintained, and the filter frame can be maintained. Since 54y is not included, the number of parts can be reduced.

Embodiment 2. FIG.
The second embodiment has a configuration in which an additional filter frame is added to the filter unit 54 in the fuel supply device 10 according to the first embodiment. Only the parts different from the first embodiment will be described below.
FIG. 6 shows the configuration of the filter unit 154 according to the second embodiment. FIG. 6 is a diagram corresponding to FIG. 4 in the first embodiment. However, FIG. 6 shows only the configuration of the filter unit 154, and the other configurations are not shown.

Filter unit 154 includes a filter 54x and a filter frame 54y having the same configuration as in the first embodiment. Furthermore, the filter unit 154 includes an inner peripheral filter frame 54z that is disposed on the inner peripheral side of the filter frame 54y with an interval of, for example, 3 mm.
The support structure for the upper and lower ends of the inner peripheral filter frame 54z may be appropriately designed according to the configuration of the pump. For example, the pump mounting plate 22 and the motor plate 52 in the first embodiment may each have an annular groove, and the lower end and the upper end of the inner peripheral filter frame 54z may be fitted and fixed in the respective grooves.

The inner peripheral filter frame 54z has the same configuration as that of the filter frame 54y of FIG. 5, and has a large number of communication holes as with the filter frame 54y. Here, the opening area per communication hole in the inner peripheral filter frame 54z and the pitch of the communication holes may be the same as those in the filter frame 54y, but are preferably different. For example, the inner peripheral filter frame 54z has a larger opening area and a larger pitch.
The inner peripheral filter frame 54z is made of a resin material such as PTFE as a material that does not corrode by DME and has a higher sound reduction effect than metal.

As described above, according to the fuel supply apparatus according to the second embodiment, the filter unit 154 further includes the inner peripheral filter frame 54z in addition to the filter unit 54 of the first embodiment. Changes more complicatedly. For this reason, the operation sound which leaks outside the pump can be further reduced.
Further, since the inner peripheral filter frame 54z is made of a resin material instead of a metal, it is possible to particularly reduce high frequency sound of 1 kHz or more.

Embodiment 3 FIG.
In the fuel supply device 10 according to the first embodiment, the third embodiment changes the shape of the filter portion 54 to form a bottomed cylindrical surface having a thickness. Only the parts different from the first embodiment will be described below.
In FIG. 7, the structure of the filter member 251 and the filter part 254 which concern on Embodiment 3 is shown. FIG. 7 is a diagram corresponding to FIG. 2 in the first embodiment.

The filter member 251 includes a motor plate 252 and a bottomed cylindrical filter portion 254 having a thickness. The filter portion 254 has a bottomed cylindrical shape including a cylindrical portion 254p having a thickness and a disk-like upper bottom portion 254q. That is, the filter portion 254 has a cylindrical shape having an open end on one side and a closed end on the other side. In the present embodiment, the cylindrical portion 254p is a cylindrical portion, and the motor plate 252 and the upper bottom portion 254q constitute a lid portion.
The cylindrical portion 254p has the same configuration as the filter portion 54 of the first embodiment, and the lower end 254b is supported in the same manner as the first embodiment. The upper end of the cylindrical portion 254p and the periphery of the upper bottom portion 254q are welded as a joint portion 254a. The filter portion 254 has a rigidity that can be elastically deformed to some extent throughout.
The upper bottom portion 254q is fastened and fixed to the motor plate 252 with a bolt 248 that fixes the motor plate 252 and the motor housing 56. Unlike the first embodiment, since the upper portion of the filter portion 254 is fixed by the bolt 248, the motor plate 252 does not need to support the inner periphery of the cylindrical portion 254p, and therefore the diameter thereof is the motor plate 52 of the first embodiment. It can be smaller.

As described above, according to the fuel supply device according to the third embodiment, the upper bottom portion 254q in addition to the cylindrical portion 254p functions as a filter. Can be further reduced.
Further, since the filter portion 254 can be elastically deformed and its upper portion is fixed by a bolt 248, it is not necessary to align with members such as the motor plate 52 and the seal ring 130 of the first embodiment, and the mounting accuracy is further increased. It can be rough.

  In the above-described third embodiment, a modification as in the second embodiment may be applied. For example, a filter frame may be further disposed on the inner periphery of the cylindrical portion 254p, and a filter frame may be further disposed on the lower side of the upper bottom portion 254q. By adopting such a configuration, all the effects of the second and third embodiments can be obtained.

It is a figure which shows the structure containing the fuel supply apparatus which concerns on Embodiment 1 of this invention. It is an expanded sectional view of a pump and its periphery of the fuel supply apparatus of FIG. It is the figure which expanded a part of joining part of the fuel tank and pump attachment plate in FIG. It is sectional drawing in the IV-IV line of FIG. It is a figure which shows the state before a filter part is formed in a cylindrical shape. FIG. 5 is a diagram corresponding to FIG. 4 in the first embodiment, showing a configuration of a filter unit according to the second embodiment. FIG. 6 is a view corresponding to FIG. 2 in the first embodiment, showing the configuration of the filter member according to the third embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Fuel supply system, 12 Engine (internal combustion engine), 16 Pump, 18 Fuel tank, 22 Pump attachment plate (pump support member), 34 Relief valve, 50a Motor part, 50b Pump action part, 51,251 Filter member, 52, 252 Motor plate (lid part), 54, 154, 254 Filter part, 54x filter, 54y Filter frame, 130 Seal ring.

Claims (5)

A fuel tank,
A pump for supplying fuel from the fuel tank to an external internal combustion engine;
A pump support member that supports the pump inside the fuel tank;
The pump is
A pump action unit supported by the pump support member for supplying the fuel;
A motor unit for driving the pump action unit;
A fuel supply system including a filter member for removing foreign matter from the fuel,
The filter member has a bottomed cylindrical shape having an open end on one side and a bottom on the other side,
The filter member is attached to the pump support member at the open end,
The fuel supply system, wherein the pump action part and the motor part are covered by the filter member and the pump support member.   The fuel supply system according to claim 1, wherein the filter member includes a mesh-like filter and a filter frame having an opening that supports the filter. The filter member is
A lid portion constituting the bottom portion;
Including a cylindrical filter part having both ends open,
The fuel supply system according to claim 1, wherein a seal ring that seals between the filter part and at least one of the lid part and the pump support member is disposed. The filter member includes a bottomed cylindrical filter portion having an open end on one side,
The fuel supply system according to claim 1, wherein a seal ring that seals between the opening end of the filter unit and the pump support member is disposed. The pump has a relief valve;
The relief valve returns the fuel in the pump action part to the fuel tank without passing through the filter member when the pressure in the pump action part reaches a predetermined value. Fuel supply system.

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