JP2021188576A - Pump case - Google Patents

Abstract

To provide a pump case which can prevent fragments of a metal mold from scattering due to the breakage of the metal mold which is used at injection molding, and can be accurately formed.SOLUTION: A pump case comprises a case main body 11 having a cylindrical peripheral wall 11c, and return piping 14 extending in a direction intersecting with an axial direction D1 of the case main body 11. The case main body 11 has a pump accommodation chamber 15 and a filter accommodation chamber 16 which are formed inside one end side and the other end side of the case main body 11 in the axial direction D1, and a bulkhead 17 for defining the accommodation chambers. The return piping 14 and the pump accommodation chamber 15 communicate with each other via a communication port 18, a distance between a position of an internal peripheral face 18a of the communication port 18 and a first face 17a of the bulkhead 17 at the pump accommodation chamber 15 side is within 1 mm, the bulkhead 17 has a recess 19 formed at an external peripheral face 17b of a side at which the communication port 18 of the first face 17a is formed, and the recess 19 has a bottom part 19a protruding toward the filter accommodation chamber 16 from the pump accommodation chamber 15.SELECTED DRAWING: Figure 3

Description

The present invention relates to a pump case.

Conventionally, a vehicle equipped with an internal combustion engine such as a motorcycle has been known to be provided with a fuel pump module arranged outside the fuel tank and supplying fuel in the fuel tank to the internal combustion engine (for example, patent documents). 1).

The fuel pump module described in Patent Document 1 includes a pump body (fuel pump) that pressurizes and discharges fuel, and a pump case (pump body) that houses the pump body. The pump case has a first storage chamber (pump storage chamber) in which the pump main body is housed inside the peripheral wall. On the outer peripheral surface of the peripheral wall forming the first storage chamber of the pump case, a pipe extending in a direction intersecting the axial direction of the pump case is provided. The fuel discharged from the pressure regulator is circulated in the pipe in order to keep the fuel pressure in the fuel flow path constant. The pipe and the first storage chamber are communicated with each other through a communication port so that fuel can pass therethrough.

Japanese Unexamined Patent Publication No. 2006-144552

Inside the peripheral wall of the pump case, a second storage chamber in which a filter for filtering fuel or the like is arranged may be provided in addition to the first storage chamber. In this case, a partition wall is provided that separates the inside of the peripheral wall into the first accommodation chamber and the second accommodation chamber.
By the way, the pump case used for the fuel pump module is formed by resin molding. The resin molding mold has a core and a cavity for forming the first storage chamber and the second storage chamber. The molten resin flows between the core and the cavity to form the first storage chamber, the second storage chamber, and the partition wall. The pipe extending from the first accommodation chamber is formed by a slide core pin that slides in a direction intersecting the mold release direction of the mold.

In the pump case as described above, for example, when the communication port between the pipe and the first storage chamber is provided in the vicinity of the partition wall, in order to accurately position the slide core pin, the communication port of the first storage chamber is used. It is desirable to form a recess in which the tip of the slide core pin is fitted at the corresponding position.
However, the positions of the partition wall-side end and the recess of the core forming the first accommodation chamber are too close to each other, and the wall thickness between the partition wall-side end and the recess of the core becomes thinner than the other portions. It ends up.
When the injection pressure of the resin was applied to the slide core pin, the concave portion of the core was damaged, and the fragments of the core (mold) could be scattered.
Further, if the core is damaged, the slide core pin supported by the core may be displaced due to the injection pressure of the resin. If the slide core pin is displaced, the slide core pin will enter the position that becomes the partition wall. If injection molding is performed in this state, the wall thickness of the partition wall becomes partially thin, and there is a possibility that the pump case cannot be manufactured accurately.

Therefore, the present invention provides a pump case that can prevent the mold used during injection molding from being damaged and the fragments of the mold from being scattered, and can be molded with high accuracy.

In order to solve the above problems, the pump case according to the present invention has a case body having a tubular peripheral wall for accommodating a pump body that sucks and discharges fuel inside, and a shaft of the case body from the case body to the case body. A first accommodation that is formed inside the case body on one end side in the axial direction and houses the pump body, and includes a pipe that extends in a direction intersecting the direction and through which the fuel flows. It has a chamber, a second storage chamber formed inside the other end side of the case body in the axial direction, and a partition wall separating the first storage chamber and the second storage chamber, and has the piping. The first storage chamber is communicated through a communication port through which the fuel passes, and is between the position of the inner peripheral surface of the communication port and the first surface of the partition wall on the first storage chamber side. The distance is within 1 mm, the partition wall has a recess formed in the outer peripheral portion of the first surface on the side where the communication port is formed, and the recess is from the first storage chamber to the first. 2 It is characterized by having a bottom protruding toward the containment chamber.

In the above configuration, the recess may be formed deeper toward the radial outer side of the case body.

In the above configuration, the protruding height of the bottom portion toward the second storage chamber side may be increased toward the radial outer side of the case body.

In the above configuration, the surface of the bottom portion on the side of the second storage chamber may be formed in a curved shape.

According to the present invention, it is possible to provide a pump case which can prevent the mold used at the time of injection molding from being damaged and the fragments of the mold from being scattered and can be molded with high accuracy.

It is an external perspective view of the fuel pump module of an embodiment. It is an exploded perspective view of the fuel pump module of an embodiment. FIG. 3 is a cross-sectional view taken along the line I-I of FIG. It is sectional drawing which shows the state which the mold was clamped. FIG. 3 is a schematic cross-sectional view showing a state in which a pump case is formed by cooling and solidifying the molten resin injected into the cavity from the state shown in FIG. FIG. 5 is a schematic cross-sectional view showing a state in which the mold is released from the state shown in FIG. 5 and the pump case is taken out. FIG. 3 is a schematic cross-sectional view showing a state in which a pump case is formed in a state where the molten resin is injected into the cavity and the slide core pin is displaced from the state shown in FIG.

Next, an embodiment of the present invention will be described with reference to FIGS. 1 to 7.
FIG. 1 is an external perspective view of the fuel pump module 1.
The fuel pump module 1 of the present embodiment shown in FIG. 1 is arranged outside a fuel tank (not shown) of a saddle-type vehicle such as a motorcycle, and is a liquid fuel such as gasoline in the fuel tank (hereinafter, referred to as “)”. It is applied to the application of pumping "fuel") toward an internal combustion engine (not shown). The fuel pump module 1 can also be mounted on other vehicles such as automobiles and four-wheeled vehicles.

FIG. 2 is an exploded perspective view of the fuel pump module 1.
As shown in FIGS. 1 to 2, the fuel pump module 1 closes a pump case 10 having a cylindrical case body 11 long in the axial direction D1 and an opening on one end 11a side of the case body 11 in the axial direction D1. It includes a first module cover 30 and a second module cover 40 that closes an opening on the other end 11b side of the axial direction D1 of the case body 11.
The pump case 10 and the first and second module covers 30 and 40 are both made of a resin material. The fuel pump module 1 of the present embodiment is mounted below the fuel tank (not shown), for example, in a posture in which the central axis of the pump case 10 is oriented in the horizontal direction. On the outer peripheral surface of the case body 11, a suction pipe 12 for sucking fuel from the fuel tank, a delivery pipe 13 for sending the sucked fuel to the internal combustion engine, and a return pipe 14 for circulating surplus fuel and returning it to the fuel tank (claimed claim). (Equivalent to the piping of) and is provided.

The suction pipe 12, the delivery pipe 13, and the return pipe 14 are provided at positions separated from one end 11a side of the axial direction D1 of the case main body 11 by a predetermined distance. These pipes 12, 13 and 14 (suction pipe 12, delivery pipe 13, return pipe 14) extend from the outer peripheral surface of the case main body 11 in a direction intersecting the axial direction D1. The suction pipe 12 is connected to the fuel tank via a hose (not shown) or the like. The delivery pipe 13 is connected to the internal combustion engine via a hose (not shown) or the like. The return pipe 14 is connected to the fuel tank via a hose (not shown) or the like. The fuel pump module 1 is mounted below the fuel tank with the hose connection ends of the suction pipe 12 and the return pipe 14 facing upward in the vertical direction.

FIG. 3 is a cross-sectional view taken along the line I-I of FIG.
As shown in FIG. 3, a partition wall 17 is formed inside the case body 11 at a position separated from one end 11a side of the axial direction D1 of the case body 11 by a predetermined distance (see FIG. 2). The case main body 11 is formed with a pump storage chamber 15 (corresponding to the first storage chamber according to claim) and a filter storage chamber 16 (corresponding to the second storage chamber according to claim) on both sides of the partition wall 17 in the axial direction D1. Will be done. In other words, the partition wall 17 separates the pump accommodating chamber 15 and the filter accommodating chamber 16 inside the case main body 11. Specifically, the pump accommodating chamber 15 is formed inside the case body 11 on the one end 11a side. A filter accommodating chamber 16 is formed inside the other end 11b side of the case body 11.

The suction pipe 12 leads to the filter accommodating chamber 16 side. The delivery pipe 13 leads to the pump accommodating chamber 15. The return pipe 14 and the pump accommodating chamber 15 communicate with each other through a communication port 18 through which fuel passes. The distance in the axial direction D1 between the position of the inner peripheral surface 18a of the communication port 18 and the first surface 17a on the pump accommodating chamber 15 side of the partition wall 17 is within 1 mm, and the inner peripheral surface 18a of the communication port 18 is. The partition wall 17 is located on the pump accommodation chamber 15 side in the axial direction D1 with respect to the first surface 17a on the pump accommodation chamber 15 side of the partition wall 17.

The outer peripheral portion 17b of the first surface 17a of the partition wall 17 is continuous with the inner peripheral surface of the case body 11. A recess 19 is formed in the vicinity of the communication port 18 in the outer peripheral portion 17b. The recess 19 has a bottom portion 19a that projects from the pump storage chamber 15 toward the filter storage chamber 16.

The recess 19 is formed deeper toward the outside of the case body 11 in the radial direction D2. The protruding height of the recess 19 toward the filter accommodating chamber 16 side increases toward the outside of D2 in the radial direction. The surface of the recess 19 on the filter accommodating chamber 16 side is formed in a curved shape.

On the other hand, as shown in FIG. 2, a plurality of lock convex portions 11d are projected on the outer peripheral surface of the case main body 11 on the other end 11b side. The lock protrusion 11d engages with the second module cover 40.

Further, a connector 21 for connecting a three-phase power cable is integrally provided on the peripheral wall 11c surrounding the outside of the pump accommodating chamber 15 of the case main body 11. The three-phase terminals of the connector 21 are connected to the power supply unit of the pump main body 3 via the relay cable unit 5 inside the pump accommodating chamber 15.

The pump accommodating chamber 15 accommodates a pump body 3 that sucks in and discharges the fuel introduced inside through the suction pipe 12. The pump body 3 has a built-in electric motor (not shown) and is driven by the power of the electric motor. The pump main body 3 sucks the sucked fuel from the pump suction port 3a on one end side in the axial direction D1 and discharges it from the pump discharge port 3b on the other end side in the axial direction D1.

The filter accommodating chamber 16 accommodates a filter cartridge 2 that filters the fuel introduced inside through the suction pipe 12 before introducing it into the pump body 3. The filter cartridge 2 is formed by arranging a filter (filter element) 2a folded in a bellows shape in an annular shape. The filter 2a is attached to the resin case portion 2b. The outer peripheral side of the filter 2a is the fuel introduction side (pre-filtration side), and the inner peripheral side is the fuel lead-out side (post-filtration side).

The case portion 2b of the filter cartridge 2 is provided with an inner cylinder 2c. The inner cylinder 2c is connected to the pump suction port 3a of the pump body 3 through a through hole (not shown) provided in the partition wall 17. A sealing member 20 for sealing is provided between the inner cylinder 2c and the through hole of the partition wall 17. The seal member 20 is formed in an annular shape when viewed from the axial direction D1.

The second module cover 40 provided on the other end 11b side of the axial direction D1 of the case main body 11 has a cover bottom wall 41 that covers the opening of the other end 11b of the case main body 11 and a shaft from the outer peripheral edge portion of the cover bottom wall 41. It has a plurality of lock tongue pieces 42 that bend in the direction D1 and extend toward the pump case 10 side. The plurality of lock tongue pieces 42 extend at equal intervals on the outer peripheral edge of the cover bottom wall 41. The lock tongue piece 42 is provided so as to have a one-to-one correspondence with the lock convex portion 11d of the case body 11. Further, the lock tongue piece 42 is formed with an engagement hole 43 penetrating in the thickness direction of the lock tongue piece 42 (the radial direction D2 of the case body 11).

In the second module cover 40, in a state where the cover bottom wall 41 covers the opening on the other end 11b side of the case body 11, each lock tongue piece 42 is elastically deformed, and the engagement hole 43 of each lock tongue piece 42 is formed. , Fitted to the corresponding lock protrusion 11d. As a result, the second module cover 40 is snap-fitted to the axial end of the case body 11. The second module cover 40 is fixed to the other end 11b of the axial direction D1 of the case main body 11 after accommodating the filter cartridge 2 in the filter accommodating chamber 16 of the case main body 11. A sealing member 44 for sealing is provided between the second module cover 40 and the case body 11. The seal member 44 is formed in an annular shape when viewed from the axial direction D1.

The first module cover 30 provided on the one end 11a side of the axial direction D1 of the case main body 11 is a disk-shaped base wall 31 covering the opening on the one end 11a side of the axial direction D1 of the case main body 11 and the base wall 31. Cylindrical from the annular welding wall 32 extending outward from the outer peripheral edge in the radial direction D2 and from the boundary between the base wall 31 and the welding wall 32 (from the inner position of the welding wall 32 in the radial direction D2) toward the pump case 10. It is provided with an inner peripheral wall (not shown) projecting from the outer peripheral wall 32, and a cylindrical outer peripheral wall 33 projecting from the outer peripheral edge portion of the welding wall 32 to the same side as the inner peripheral wall. The inner peripheral wall and the outer peripheral wall 33 are formed coaxially with the disk-shaped base wall 31. The inner peripheral wall is inserted into the opening on the one end 11a side of the case body 11 in the axial direction D1. The outer peripheral wall 33 covers the outer peripheral side of the peripheral wall 11c on the one end 11a side of the axial direction D1 of the case main body 11. The end face on the one end 11a side of the peripheral wall 11c of the case main body 11 is abutted against the welding wall 32, and the end face on the one end 11a side is fixed by welding in that state.

A sealing member 34 is provided between the outer peripheral surface of the inner peripheral wall of the first module cover 30 and the inner peripheral surface of the opening on the one end 11a side of the case main body 11. The seal member 34 is formed in an annular shape when viewed from the axial direction D1.

A passage block 50 is assembled at a position in the pump case 10 facing the back surface of the first module cover 30. Hereinafter, for convenience of explanation, the side of the passage block 50 facing the back surface of the first module cover 30 is referred to as a front surface, and the side opposite to the front surface is referred to as a back surface.

The entire passage block 50 is formed in a short-axis columnar shape by a resin material. The axial direction of the passage block 50 is along the axial direction D1 of the case body 11. Three recesses are provided on the end surface on the back surface side of the passage block 50 (the end surface on the side facing the inside of the pump case 10 in the axial direction). Of the three recesses provided in the passage block 50, the pump discharge port 3b of the pump body 3 is connected to one recess, and the end of the pump case 10 of the delivery pipe 13 is connected to the one recess. A pressure regulator 4 is press-fitted into one recess.

A seal member 52 for preventing fuel leakage is provided between one recess of the passage block 50 and the pump discharge port 3b and between one recess of the passage block 50 and the end of the delivery pipe 13. ing. The seal member 52 is formed in an annular shape when viewed from the axial direction D1.
A seal member 51 for preventing fuel leakage is provided between the recess of the passage block 50 and the pressure regulator 4. The seal member 51 is formed in an annular shape when viewed from the axial direction D1.

(Manufacturing method of pump case)
Next, a method of manufacturing the pump case 10 will be described with reference to FIGS. 4 to 7. FIG. 4 is a schematic cross-sectional view showing a state in which the mold 60 is molded. FIG. 5 is a schematic cross-sectional view showing a state in which the molten resin 6 injected into the cavity 61 is cooled and solidified to form the pump case 10 from the state shown in FIG. FIG. 6 is a schematic cross-sectional view showing a state in which the mold 60 is released from the state shown in FIG. 5 and the pump case 10 is taken out. Note that FIG. 6 shows a state in which only the core 62 and the slide core pin 63 of the mold 60 are moved in order to make the explanation easy to understand. FIG. 7 is a schematic cross-sectional view showing a state in which the pump case 10 is formed in a state where the molten resin 6 is injected into the cavity 61 and the slide core pin 63 is displaced from the state shown in FIG.
The manufacturing method of this embodiment is roughly divided into a mold clamping step (see FIG. 4), a molding step after the mold clamping step (see FIG. 5), and a take-out step after the molding step (see FIGS. 6 and 7). There is.

First, the configuration of the mold 60 will be described. As shown in FIG. 4, the mold 60 includes a cavity 61 and a core 62 for forming a pump accommodating chamber 15 (see FIG. 5) and a filter accommodating chamber 16 (see FIG. 5), and a slide core pin formed in a cylindrical shape. It has 63 and.

The cavity 61 is a member constituting the outer shell of the mold 60. The inside of the cavity 61 is a cavity for arranging the core 62. The cavity 61 is formed with an insertion hole 61a for inserting the slide core pin 63 toward the internal cavity.

The core 62 is a member arranged inside the cavity 61. The core 62 has a first core 64 forming an inner peripheral surface of the pump accommodating chamber 15 and a second core 65 forming an inner peripheral surface of the filter accommodating chamber 16.

The first core 64 is formed in a columnar shape. A recess 64a into which the tip end portion 63a of the slide core pin 63 is fitted is formed on the outer peripheral surface 64c of the first core 64. The axial distance between the axial end surface 64a1 on the second core 65 side and the axial end surface 64b of the first core 64 on the side surface of the recess 64a is within 1 mm. The recess 64a is formed in a circular shape when viewed from the radial direction of the first core 64. The end surface 64b of the first core 64 is provided with a core convex portion 64d protruding in the axial direction of the first core 64. One core convex portion 64d is provided in the vicinity of the concave portion 64a in the outer peripheral edge portion of the end surface 64b. The core convex portion 64d is provided at the same position as the concave portion 64a when viewed from the axial direction of the first core 64. The core convex portion 64d is formed so as to taper from the outer peripheral surface 64c toward the inner side in the radial direction of the first core 64. The radial inner end of the core convex portion 64d is located radially inward with respect to the concave portion 64a.

The second core 65 is formed in a cylindrical shape. A core recess 65b is provided at one of the outer peripheral edges of the axial end surface 65a of the second core 65. The inner peripheral surface of the core recess 65b approaches the end surface 65a from the outer peripheral surface 65c of the second core 65 toward the radial inward side of the second core 65. The inner peripheral surface of the core recess 65b is formed in a curved shape.

The outer diameter of the slide core pin 63 is smaller than the inner diameter of the insertion hole 61a of the cavity 61. The outer diameter of the tip portion 63a of the slide core pin 63 to be fitted into the recess 64a is formed to be substantially the same as or slightly larger than the inner diameter of the recess 64a of the first core 64.
Subsequently, each step of the manufacturing method of the pump case 10 will be described in detail below.

(Molding process)
As shown in FIG. 4, when the mold 60 is molded, the core 62 is arranged inside the cavity 61, and the first space S1 is formed between the cavity 61 and the core 62. More specifically, when the mold 60 is molded, the first core 64 and the second core 65 are arranged so that the end surface 64b of the first core 64 and the end surface 65a of the second core 65 face each other. At this time, the axial direction of the first core 64 is along the axial direction of the second core 65. The end surface 64b of the first core 64 and the end surface 65a of the second core 65 are separated in the axial direction. Then, the second space S2 is formed between the end surface 64b of the first core 64 and the end surface 65a of the second core 65. The core convex portion 64d provided on the end surface 64b is arranged at the same position as the core concave portion 65b provided on the end surface 65a when viewed from the axial direction. The radial inner end of the core recess 65b is located radially inside the recess 64a of the first core 64. As a result, the concave space S2a is formed between the end surface 64b of the first core 64 and the end surface 65a of the second core 65. The concave space S2a constitutes a part of the second space S2.

Further, when the mold 60 is molded, the slide core pin 63 is inserted into the insertion hole 61a of the cavity 61, and the tip portion 63a of the slide core pin 63 is fitted into the recess 64a of the first core 64. At this time, the outer peripheral surface of the slide core pin 63 and the inner peripheral surface of the insertion hole 61a are separated from each other. Then, a third space S3 is formed between the outer peripheral surface of the slide core pin 63 and the inner peripheral surface of the insertion hole 61a.
The space S is composed of the first space S1, the second space S2, and the third space S3.

(Molding process)
After forming the space S by the mold clamping step described above, as shown in FIG. 5, the molten resin 6 heated to a predetermined temperature through a runner (not shown) and a gate (not shown) is injected, for example, at a predetermined injection speed and injection. It is ejected into the first space by pressure. Then, the molten resin 6 is sufficiently distributed in the space S (see FIG. 4).
At this time, the slide core pin 63 is fitted into the recess 64a, and the thickness of the recess 64a is secured by the core convex portion 64d. As a result, the slide core pin 63 is prevented from being displaced by the injection pressure of the molten resin 6.

After the injection of the molten resin 6, the pump case 10 is formed by cooling and solidifying the molten resin 6. More specifically, the molten resin 6 filled in the first space S1 forms the peripheral wall 11c of the case body 11. The molten resin 6 filled in the second space S2 forms the partition wall 17 of the case body 11. The molten resin 6 filled in the concave space S2a forms the concave portion 19 of the partition wall 17. The molten resin 6 filled in the third space S3 forms the return pipe 14.

Here, in the above-mentioned molding step, the slide core pin 63 may be tilted due to the injection pressure of the molten resin 6. Since the distance between the inner peripheral surface 18a of the communication port 18 and the partition wall 17 is within 1 mm in the axial direction D1, when the slide core pin 63 is tilted, the tip portion 63a of the slide core pin 63 enters the partition wall 17 into the second space S2 (bulkhead). There is a possibility that a part of the partition wall 17 after molding will be thinned. However, since the core convex portion 64d is formed on the end surface 64b of the first core 64, the slide core pin 63 does not get stuck in the partition wall 17, and the wall thickness of the partition wall 17 is secured.

(Extraction process)
As shown in FIG. 6, after the pump case 10 is formed, the cavity 61 and the core 62 are released from each other. At this time, the first core 64 and the second core 65 are released from the mold. The slide core pin 63 slides from the first core 64 along a direction (slide direction) orthogonal to the mold release direction of the first core 64 in accordance with the mold release between the first core 64 and the second core 65. It is released. After that, the pump case 10 is taken out from the inside of the mold 60.
The pump case 10 is manufactured as described above.

Further, as shown in FIG. 7, it can be assumed that the slide core pin 63 is displaced while being fitted in the recess 64a during the molding process. Even in the case as shown in FIG. 7, since the thickness of the concave portion 64a is secured by the core convex portion 64d, the concave portion 64a of the first core 64 is damaged by the injection pressure of the molten resin 6, and the fragments of the mold 60 are broken. Can be prevented from scattering.
In the above-mentioned manufacturing method, the description of the manufacturing process of the parts other than the case main body 11 and the return pipe 14 in the pump case 10 is omitted. For example, the suction pipe 12, the delivery pipe 13, and the like are formed by the same method as the return pipe 14.

(Action effect)
According to the above-described embodiment, the partition wall 17 has a recess 19 formed in the outer peripheral portion 17b on the side where the communication port 18 of the first surface 17a is formed.
Thereby, in order to form the concave portion 19 in the partition wall 17, the core convex portion 64d can be provided in the first core 64. Since the thickness of the recess 64a into which the slide core pin 63 is fitted is secured by the core convex portion 64d, the rigidity of the recess 64a can be ensured. Therefore, when the injection pressure of the molten resin 6 is applied to the slide core pin 63, the recess 64a of the first core 64, which is a part of the mold 60, is damaged, and the fragments of the mold 60 can be prevented from scattering. ..
Further, since it is possible to prevent the first core 64 from being damaged, it is possible to prevent the slide core pin 63 from being displaced due to the injection pressure of the molten resin 6. As a result, it is possible to prevent the slide core pin 63 from entering the second space S2 which is the partition wall 17. Therefore, it is possible to prevent the partition wall 17 from being partially thinned, so that the pump case 10 can be formed with high accuracy.
The recess 19 has a bottom portion 19a that projects from the pump storage chamber 15 toward the filter storage chamber 16.
As a result, it is possible to prevent the thickness of the partition wall 17 from being partially thinned in the recess 19, so that the rigidity of the partition wall 17 can be ensured.

Further, the recess 19 is formed deeper toward the outer side of the radial direction D2 of the case body 11.
As a result, a draft is formed inside the core convex portion 64d for forming the concave portion 19 in the radial direction. Therefore, after the pump case 10 is formed, the first core 64 can be easily released from the mold.

The protruding height of the recess 19 toward the filter accommodating chamber 16 side increases toward the outside of D2 in the radial direction.
As a result, the space of the filter accommodating chamber 16 can be expanded as compared with the case where the surface of the recess 19 on the filter accommodating chamber 16 side is formed in an L shape in a side view. Therefore, the layout in the filter accommodating chamber 16 can be improved.
In addition, when the recess 19 is formed deeper toward the outer side of the radial direction D2 of the case body 11, the thickness of the partition wall 17 can be more reliably suppressed from being partially thinned in the recess 19, so that the partition wall 17 can be prevented from becoming partially thin. The rigidity of the can be further secured.

Further, the surface of the recess 19 on the filter accommodating chamber 16 side is formed in a curved shape.
As a result, the layout in the filter accommodating chamber 16 can be further improved as compared with the case where the surface of the recess 19 on the filter accommodating chamber 16 side is formed in an L-shape in a side view.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments. The configuration may be added, omitted, replaced, or otherwise changed without departing from the spirit of the present invention. The present invention is not limited by the above description, but only by the appended claims.

In addition, as long as the gist of the present invention is not deviated, the constituent elements in the above-described embodiment may be appropriately replaced with well-known constituent elements, and the above-mentioned modifications may be appropriately combined.

3 ... Pump body, 10 ... Pump case, 11 ... Case body, 11a ... One end, 11b ... The other end, 11c ... Circumferential wall, 14 ... Return piping (pipe), 15 ... Pump accommodation room (first storage room), 16 ... Filter accommodating chamber (second accommodating chamber), 17 ... partition wall, 17a ... first surface, 17b ... outer peripheral portion, 18 ... communication port, 18a ... inner peripheral surface, 19 ... concave portion, 19a ... bottom, D1 ... axial direction, D2 … Radial direction

Claims (4)

A case body with a cylindrical peripheral wall that houses the pump body that sucks in and discharges fuel,
A pipe extending from the case body in a direction intersecting the axial direction of the case body and through which the fuel is circulated is provided.
The case body
A first storage chamber formed inside the case body on one end side in the axial direction and accommodating the pump body, and a first storage chamber.
A second storage chamber formed inside the other end of the case body in the axial direction, and
It has a partition wall that separates the first accommodation chamber and the second accommodation chamber.
The pipe and the first storage chamber are communicated with each other through a communication port through which the fuel is passed.
The distance between the position of the inner peripheral surface of the communication port and the first surface of the partition wall on the first accommodation chamber side is within 1 mm.
The partition wall has a recess formed in the outer peripheral portion of the first surface on the side where the communication port is formed.
The pump case is characterized in that the recess has a bottom portion protruding from the first storage chamber toward the second storage chamber. The pump case according to claim 1, wherein the recess is formed deeper toward the radial outer side of the case body. The pump case according to claim 1 or 2, wherein the protruding height of the bottom portion toward the second storage chamber side increases toward the radial outer side of the case body. The pump case according to claim 3, wherein the surface of the bottom portion on the side of the second storage chamber is formed in a curved shape.

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