JP7236968B2 - fuel pump module - Google Patents

Description

The present invention relates to a fuel pump module for supplying fuel to an internal combustion engine.

2. Description of the Related Art Vehicles equipped with an internal combustion engine, such as motorcycles, are conventionally known to have a fuel pump module arranged outside a fuel tank to supply fuel in the fuel tank to the internal combustion engine (for example, See Patent Document 1).

In the fuel pump module disclosed in Patent Document 1, a filter, a pump body, and the like are housed inside a substantially cylindrical module case having an opening at one end. The module case is provided with a suction pipe for introducing fuel through a filter into the pump suction port of the pump body, and a feed pipe for feeding the fuel discharged from the pump body to the internal combustion engine. An opening on one end side of the module case is closed by a separate module cover. The module case and the module cover are made of a resin material, and the module cover is fixed by welding to the periphery of the opening of the module case.

Japanese Patent No. 6444481

In the pump module disclosed in Patent Literature 1, the module case and the module cover are sealed only by welding. In order to prevent multiple leaks of fuel from between the module case and the module cover, interposition of an annular seal member between the module case and the module cover is currently under consideration.

In this case, for example, a peripheral wall protruding in a cylindrical shape is provided radially inside the welded portion of the module cover, and the peripheral wall is inserted into the opening of the module case. It is conceivable to interpose an annular seal member therebetween. However, if a sealing member is attached to the outer peripheral surface of the peripheral wall of the module cover before the module cover is assembled to the module case, and an attempt is made to insert the peripheral wall of the module cover into the opening of the module case in that state, the sealing member may be damaged at the peripheral edge of the opening. It may be pressed against the edge of the part. Then, if the sealing member is strongly pressed against the edge portion, the possibility of damage to the sealing member increases. When the gap between the peripheral wall of the module cover and the opening is small, the escape space (deformation space) of the seal member when the edge portion hits the seal member becomes small, and the seal member receives damage at this time. becomes larger. Therefore, it is difficult to sufficiently narrow the gap between the peripheral wall of the module cover and the opening.

On the other hand, if the gap between the peripheral wall of the module cover and the opening becomes large, when the module cover and the module case are welded together, the melted resin at the welded part passes through the gap and contacts the sealing member, resulting in deterioration of the sealing member. It is feared that

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a fuel pump module that can prevent deterioration of a seal member during assembly or welding.

In order to solve the above problems, a fuel pump module according to the present invention employs the following configuration.
That is, the fuel pump module according to the present invention comprises a substantially cylindrical module case having an opening at one end in the axial direction, a pump main body housed inside the module case, and fixed to one end in the axial direction of the module case. and an annular sealing member interposed between the module case and the module cover. The module cover includes a base wall that covers the opening, and an annular shape that is positioned on the outer peripheral edge of the base wall and is fixed by welding to the end surface of the module case on one end side in the axial direction. and an inner peripheral wall projecting cylindrically from a radially inner position of the welding wall and inserted into the opening, wherein the inner peripheral wall is closer to the projecting end than the base end. A seal holding portion for holding a member is provided, and between the outer peripheral surface of the inner peripheral wall and the chamfered portion, the outer peripheral surface of the inner peripheral wall and the chamfered portion cooperate to hold the end face of the module case and the chamfered portion. A burr receiving portion is formed to receive a welding burr at the welded portion with the welding wall, and the sealing member is in contact with the outer peripheral surface of the inner peripheral wall and the inner peripheral surface of the opening.

The module cover has an outer peripheral wall that protrudes in a cylindrical shape from a radially outer position of the weld wall and covers an outer peripheral surface of the module case on one end side in the axial direction, and the outer peripheral wall protrudes from the weld wall. The length may be set longer than the length from the welding wall to the seal holding portion.

A second burr receiving portion is formed between the inner peripheral surface of the outer peripheral wall and the outer peripheral surface of the module cover to receive a welding burr at the welded portion between the end surface of the module case and the welding wall. Also good.

The module case may have a protective wall that protrudes radially outward from an outer peripheral surface near one end in the axial direction and faces an end surface of the outer peripheral wall.

Contents are assembled inside the module case so as to face the base wall of the module cover, and the protruding end of the inner peripheral wall abuts against the outer peripheral edge of the contents to displace the contents. You may make it comprise the displacement control part which controls.

According to the present invention, the space between the module cover and the module case can be double-sealed by welding and the sealing member, and the chamfered portion of the module case eliminates the edge contact of the sealing member at the time of assembly. The gap between the opening and the inner peripheral wall of the module cover can be sufficiently narrowed. Therefore, when the present invention is adopted, it is possible to prevent deterioration of the sealing member due to the edge contact of the sealing member during assembly, and when the module case and the module cover are welded together, the sealing member melts through the gap between the opening and the inner peripheral wall. It is also possible to prevent deterioration of the seal member due to contact of the resin with the seal member.

1 is an external perspective view of a fuel pump module according to an embodiment; FIG. 2 is an exploded perspective view of the fuel pump module of the embodiment; FIG. Sectional drawing corresponding to the III-III section of FIG. 6 of the fuel pump module of embodiment. Sectional drawing corresponding to the IV-IV section of FIG. 6 of the fuel pump module of embodiment. The perspective view of the 1st module cover of embodiment. The rear view of the passage block of embodiment. The perspective view of the passage block of embodiment. 7A and 7B are sectional views corresponding to the III-III section of FIG. 6, showing the initial state (A) and the state (B) after the assembly of the module case and the first module cover of the embodiment; FIG. 7 is a cross-sectional view corresponding to the III-III cross section of FIG. 6 showing the state (A) before welding and the state (B) after welding between the module case and the first module cover of the embodiment; The enlarged view of the X section of FIG.9(B) of the fuel pump module of embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is an external perspective view of the fuel pump module 1 of the embodiment. FIG. 2 is an exploded perspective view of the fuel pump module 1. FIG. 3 is a sectional view corresponding to the III-III section of FIG.
The fuel pump module 1 of the present embodiment is arranged, for example, outside a fuel tank (not shown) of a straddle-type vehicle such as a motorcycle. ) to an internal combustion engine (not shown). Of course, the fuel pump module 1 can also be mounted on other vehicles such as four-wheeled vehicles.

The fuel pump module 1 includes a substantially cylindrical module case 2 that is long in the axial direction, a first module cover 4 (module cover) that closes an opening 3 on one end side of the module case 2 in the axial direction, and an axis of the module case 2 . and a second module cover 6 that closes an opening (not shown) on the other end side of the direction. Both the module case 2 and the first and second module covers 4 and 6 are made of a resin material. The fuel pump module 1 of this embodiment is mounted below a fuel tank (not shown), for example, with the central axis of the module case 2 directed horizontally. The outer peripheral surface of the module case 2 is provided with an intake pipe 7 for sucking fuel from the fuel tank, a delivery pipe 8 for delivering the sucked fuel to the internal combustion engine, and a return pipe 9 for returning surplus fuel to the fuel tank. ing. These pipes (suction pipe 7, delivery pipe 8, return pipe 9) are connected to the fuel tank side and the internal combustion engine side via hoses or the like. The fuel pump module 1 is mounted below the fuel tank with the hose connecting ends of the intake pipe 7 and the return pipe 9 facing vertically upward.

Inside the substantially cylindrical module case 2 are a filter cartridge 10 for filtering fuel introduced into the interior through the suction pipe 7, and a pump body 11 for pressurizing and discharging the fuel that has passed through the filter 10a of the filter cartridge 10. , is housed. In the filter cartridge 10, bellows-folded filters 10a are arranged in an annular shape. The filter 10a is attached to a case portion 10b made of resin. The filter 10a, which is arranged in an annular shape, has an outer peripheral side serving as a fuel introduction side (pre-filtering side) and an inner peripheral side serving as a fuel outlet side (post-filtering side). The pump main body 11 incorporates an electric motor 11a (see FIG. 3) and is driven by the power of the electric motor 11a. The pump main body 11 sucks the fuel that has passed through the filter 10a from a pump suction port 11b on one axial end side and discharges it from a pump discharge port 11c on the other axial end side.

The suction pipe 7, the delivery pipe 8, and the return pipe 9 protrude from one end side (opening 3 side) of the module case 2 in the axial direction to a position separated by approximately two-thirds of the axial length of the module case 2. is set. Inside the module case 2, at a position separated from one axial end side of the module case 2 in the axial direction by approximately two-thirds of the axial length of the module case 2, the inside of the module case 2 is provided as a pump accommodating chamber. 12 (see FIG. 3) and a filter accommodating chamber (not shown) are separated from each other by a partition wall (not shown). The suction pipe 7 communicates with the filter housing chamber side, and the delivery pipe 8 and the return pipe 9 communicate with the pump housing chamber 12 side. A through hole (not shown) is provided in the partition wall of the module case 2, and the inner cylinder 10c of the case portion 10b of the filter cartridge 10 is fitted into the through hole. Reference numeral 13a in FIG. 2 denotes a sealing member for sealing between the inner cylinder 10c and the through hole. The inner cylinder 10c passing through the through hole is connected to the pump suction port 11b of the pump main body 11. As shown in FIG.

3, a pump holding wall 14 for holding the pump body 11 is integrally formed inside the pump accommodating chamber 12 of the module case 2, and a delivery pipe 8 extends. there is The delivery pipe 8 extends radially inward of the module case 2 from the peripheral wall 2 b of the module case 2 and then extends substantially along the axial direction of the module case 2 toward the opening 3 . A connector 15 (see FIGS. 1 and 2) for connecting a three-phase power cable is provided integrally with the peripheral wall 2b surrounding the outside of the pump housing chamber 12 of the module case 2. As shown in FIG. The three-phase terminals of the connector 15 are connected to the power supply section of the pump main body 11 (electric motor 11a) through the relay cable unit 16 inside the pump housing chamber 12 .

The second module cover 6 includes a cover bottom wall 6a that covers an opening at the other end of the module case 2 in the axial direction, a plurality of lock tongues 6b that axially bend and extend from the outer peripheral edge of the cover bottom wall 6a, have. A plurality of locking tongues 6b are extended at regular intervals on the outer peripheral edge of the cover bottom wall 6a. Further, the locking tongue piece 6b is formed with an engaging hole 6c penetrating in the thickness direction of the locking tongue piece 6b. A plurality of lock protrusions 2a are provided on the outer peripheral surface of the module case 2 on the other end side in the axial direction. The lock protrusions 2a are provided so as to correspond to the lock tongues 6b of the second module cover 6 on a one-to-one basis. In a state where the opening of the module case 2 is covered with the cover bottom wall 6a, the second module cover 6 elastically deforms the lock tongues 6b so that the engagement holes 6c of the lock tongues 6b are aligned with the corresponding lock projections. It is fitted in the portion 2a. Thereby, the second module cover 6 is fixed to the axial end of the module case 2 in a snap-fit manner. The second module cover 6 is fixed to the axial end of the module case 2 after the filter cartridge 10 is accommodated in the filter accommodation chamber of the module case 2 . 2 denotes a sealing member for sealing the space between the second module cover 6 and the module case 2. As shown in FIG.

FIG. 4 is a cross-sectional view corresponding to the IV-IV cross section of FIG. FIG. 5 is a perspective view of the first module cover 4. FIG.
The first module cover 4 includes a disk-shaped base wall 4a that covers the opening 3 on one axial end side of the module case 2, and an annular welded wall 4b that extends radially outward from the outer peripheral edge of the base wall 4a. , an inner peripheral wall 4c protruding cylindrically from the boundary between the base wall 4a and the welded wall 4b (from a radially inner position of the welded wall 4b); and an outer peripheral wall 4d that protrudes into. The inner peripheral wall 4c and the outer peripheral wall 4d are formed coaxially with respect to the disk-shaped base wall 4a. The inner peripheral wall 4c is inserted into the opening 3 on the one end side of the module case 2 in the axial direction. The outer peripheral wall 4d covers the outer peripheral side of the peripheral wall 2b on the one end side of the module case 2 in the axial direction. An end surface 2c of the peripheral wall 2b of the module case 2 on one end side in the axial direction is abutted against the welding wall 4b. The welding wall 4b is fixed by welding to the end surface 2c on the one end side of the peripheral wall 2b.

The peripheral wall 2b of the module case 2 is provided with a chamfered portion 2d on the inner peripheral edge of the end surface 2c on the one axial end side. The chamfered portion 2d is formed in a tapered shape so that the wall thickness of the peripheral wall 2b gradually decreases toward the distal end side of the peripheral wall 2b. The chamfered portion 2d of the peripheral wall 2b forms a burr receiving portion 17 with the inner peripheral wall 4c of the first module cover 4. As shown in FIG. The burr receiving portion 17 is a space for receiving melted resin (welding burrs) when the welding wall 4b of the first module cover 4 is welded to the end surface 2c of the peripheral wall 2b of the module case 2. As shown in FIG. Further, a minute gap is secured between the outer peripheral surface of the peripheral wall 2b of the module case 2 on one end side in the axial direction and the inner peripheral surface of the outer peripheral wall 4d of the first module cover 4 . This gap constitutes a second burr receiving portion 35 for receiving molten resin (welding burrs) when the welding wall 4b of the first module cover 4 is welded to the end surface 2c of the peripheral wall 2b of the module case 2. are doing.
A strip-shaped protective wall 32 is integrally formed on the outer peripheral surface of the peripheral wall 2b of the module case 2 near one end in the axial direction so as to protrude radially outward and have an end face in the axial direction facing the end face of the outer peripheral wall 4d. It is The radial projection height of the protective wall 32 is set to be higher than the outer diameter dimension of the outer peripheral wall 4d.

The inner peripheral wall 4c of the first module cover 4 has an annular base portion 18 which is inserted into the opening 3 of the module case 2 with a small gap therebetween, and an annular stepped surface 19 on the projecting end side of the annular base portion 18. and a small-diameter portion 20 that is continuously provided. The outer peripheral surface of the small diameter portion 20 is formed to have a smaller diameter than the outer peripheral surface of the annular base portion 18 . The outer peripheral surface of the small-diameter portion 20 near the annular base portion 18 and the stepped surface 19 form a seal holding portion 22 for holding an annular seal member 21 . The seal holding portion 22 is located closer to the projecting end of the inner peripheral wall 4c than the chamfered portion 2d (burr receiving portion 17). The seal member 21 held by the seal holding portion 22 is in close contact with the outer peripheral surface of the inner peripheral wall 4 c (small diameter portion 20 ) and the inner peripheral surface of the opening 3 of the module case 2 .

A passage block 23 (contents) is assembled at a position facing the rear surface of the first module cover 4 inside the module case 2 . Hereinafter, for convenience of explanation, the side of the passage block 23 facing the back surface of the first module cover 4 is called the front side, and the side opposite to the front side is called the back side.

6 is a rear view of the passage block 23, and FIG. 7 is a perspective view of the passage block 23 viewed from the front side.
The passage block 23 is made of a resin material and has a short axis columnar shape. The axial direction of the passage block 23 is the direction along the depth direction of the opening 3 of the module case 2 . A first concave portion 24 to which the pump discharge port 11c of the pump main body 11 is connected, and the module case 2 of the delivery pipe 8 are provided on the end face on the back side of the passage block 23 (the end face on the side facing the inside of the module case 2 in the axial direction). A second recess 25 to which an inner end is connected and a third recess 27 to which a pressure regulating valve 26 (pressure regulator) is assembled by press fitting are formed.

The first recess 24, the second recess 25, and the third recess 27 are all formed by substantially circular holes. The first concave portion 24 is fitted with the boss portion 11 d of the pump body 11 where the pump discharge port 11 c is formed, and the second concave portion 25 is fitted with the end portion of the delivery pipe 8 inside the module case 2 . A check valve 50 is attached to the pump discharge port 11c of the pump main body 11 to prevent reverse flow of fuel from the direction of the passage block 23, as shown in FIG. Sealing members 51 are interposed between the first recess 24 and the boss portion 11 d and between the second recess 25 and the delivery pipe 8 to prevent leakage of fuel.

The third recessed portion 27 is formed on the end surface of the passage block 23 at a position offset from a straight line connecting the axial centers of the first recessed portion 24 and the second recessed portion 25 . That is, the first recess 24 , the second recess 25 , and the third recess 27 are arranged at the vertices of an imaginary triangle when viewed from the end face of the passage block 23 .

As shown in FIG. 6, the passage block 23 has a first connecting hole 28 connecting the bottoms of the first recess 24 and the second recess 25, and connecting the bottoms of the third recess 27 and the second recess 25. A second connection hole 29 is formed. The first connection hole 28 and the second connection hole 29 extend in a direction substantially orthogonal to the axial direction of the passage block 23 at the same height position in the axial direction of the passage block 23 . The axis 28 o of the first connection hole 28 and the axis 29 o of the second connection hole 29 intersect each other near the bottom of the second recess 25 .
In the case of this embodiment, the first recess 24, the first connection hole 28, and the second recess 25 constitute a connection passage 30 that connects the pump discharge port 11c and the delivery pipe 8, and the second connection hole 29 and the third recess 27 constitutes a branch passage 31 branching from the connection passage 30 .

As shown in FIG. 4, the pressure regulating valve 26 assembled in the third recess 27 includes a valve seat component 53 having a valve hole 53a inside a substantially cylindrical casing 52, and a spherical valve for opening and closing the valve hole 53a. It has a body 54 and a spring 55 that biases the valve body 54 in the valve closing direction (the direction to close the valve hole 53a). The valve body 54 opens and closes the valve hole 53 a from the pump housing chamber 12 side of the module case 2 . When the pressure of the fuel in the connection passage 30 connecting the pump discharge port 11c and the delivery pipe 8 rises above the set pressure, the pressure regulating valve 26 causes the valve body 54 to move against the urging force of the spring 55 to close the valve hole 53a. Open to return excess fuel into the pump housing chamber 12 . As a result, the pressure of the fuel sent to the delivery pipe 8 is regulated so as to be equal to or lower than the set pressure. The pressure regulating valve 26 has a metallic casing 52 fixed to the third recess 27 by press fitting. A sealing member 56 is interposed between the third recess 27 and the pressure regulating valve 26 to prevent leakage of fuel.

As shown in FIGS. 3, 4, and 7, the passage block 23 has a large-diameter peripheral wall 23a inserted into the opening 3 of the module case 2 with a minute gap therebetween, and an axial direction of the large-diameter peripheral wall 23a. has a small-diameter peripheral wall 23c continuous with a stepped wall 23b interposed therebetween, and a top wall 23d closing the end of the small-diameter peripheral wall 23c. The outer diameter of the small-diameter peripheral wall 23c is set smaller than the outer diameter of the large-diameter peripheral wall 23a. The small-diameter peripheral wall 23c and the top wall 23d are arranged inside the inner peripheral wall 4c of the first module cover 4, as shown in FIGS. The protruding end 4e (the protruding end of the small diameter portion 20) of the inner peripheral wall 4c of the first module cover 4 is in contact with the stepped wall 23b. The passage block 23 is axially pressed at its outer peripheral edge by the inner peripheral wall 4c of the first module cover 4, and as a result, axial displacement is restricted. In this state, a predetermined gap d is secured between the top wall 23d of the passage block 23 and the base wall 4a of the first module cover 4. As shown in FIG. A restricting protrusion 23e is provided on the outer peripheral edge of the stepped wall 23b for restricting radial displacement of the protruding end 4e (the protruding end of the small diameter portion 20) of the inner peripheral wall 4c of the first module cover 4. ing.
A protruding end 4e of the inner peripheral wall 4c constitutes a displacement restricting portion that restricts displacement of the passage block 23 (contents).

A first connection hole 28 connecting the bottom of the first recess 24 and the bottom of the second recess 25 and a second connection hole 29 connecting the bottom of the third recess 27 and the bottom of the second recess 25 are formed in the passage block 23. It is shaped by a molding pin (not shown) at the time of molding. At this time, the forming pins are arranged so that the axes 28 o and 29 o intersect near the second recess 25 . Since each molding pin is arranged so as to penetrate a part of the small diameter peripheral wall 23c of the passage block 23, after the passage block 23 is molded, a hole after the molding pin is pulled out remains in the small diameter peripheral wall 23c. The hole is closed by heat staking the perimeter of the hole.

Specifically, when the passage block 23 is formed by molding, a boss portion projecting radially outward is formed in a portion of the small-diameter peripheral wall 23c where the drawing-out hole for the molding pin remains. Heat crimping is performed by crushing the tip of the boss portion into a spherical shape with a crimping jig of the shape. As a result, the tip of the boss melts so as to flow toward the center, and as a result, the remaining end of the hole is closed with the molten resin. Reference numeral 33 in FIG. 7 denotes a closed portion of the hole by heat caulking.
In this embodiment, the bottoms of the first recess 24, the second recess 25, and the third recess 27 are connected by the first connection hole 28 and the second connection hole 29 that intersect at the second recess 25. Two connection holes may be formed so as to cross each other at the first recess 24 and the third recess 27 .

FIG. 8 is a diagram showing how the first module cover 4 is attached to one axial end of the module case 2 before welding. FIG. 8(A) is a sectional view corresponding to the section III-III in FIG. 6 showing the initial state of assembly of the module case 2 and the first module cover 4. FIG. FIG. 8B is a sectional view corresponding to the section III-III in FIG. 6 showing the state after the module case 2 and the first module cover 4 have been assembled.
As shown in FIG. 8(A), the outer peripheral wall 4d of the first module cover 4 has a projection length L1 from the welding wall 4b, which is a length L2 from the welding wall 4b to the seal holding portion 22 (seal member 21). is set longer than Therefore, when assembling the first module cover 4 with the sealing member 21 attached to the peripheral wall 2b of the module case 2, the end of the outer peripheral wall 4d is first attached to the module case 2 as shown in FIG. 8(A). By fitting over the edge of the peripheral wall 2b, the first module cover 4 can be centered with respect to the module case 2 so as to avoid hard contact between the edge of the peripheral wall 2b and the sealing member 21. FIG.

When the first module cover 4 is pushed toward the module case 2 from the state shown in FIG. is pushed into the inner side of the peripheral wall 2b via the chamfered portion 2d (see FIG. 8(B)). At this time, since the edge of the sealing member 21 does not come into contact with the inner peripheral edge of the peripheral wall 2b, the sealing member 21 is less likely to be damaged during the assembly process.

FIG. 9 shows how the first module cover 4 is welded to one end of the module case 2 in the axial direction. FIG. 9A is a sectional view corresponding to the section III-III in FIG. 6 showing the state before the module case 2 and the first module cover 4 are welded together. FIG. 9B is a sectional view corresponding to the section III-III in FIG. 6 showing the state after the module case 2 and the first module cover 4 are welded. Moreover, FIG. 10 is the figure which expanded and showed the X section of FIG. 9, 3, and 4, illustration of welding burrs that have flowed into the burr receiving portion 17 and the second burr receiving portion 35 is omitted.
As shown in FIG. 9(A), the welding wall 4b of the first module cover 4 is abutted against the end surface 2c of the peripheral wall 2b of the module case 2, and in this state, a laser welding machine or the like is applied to the abutting portions of both. Welding is performed using When the peripheral wall 2b of the module case 2 and the abutting portion of the first module cover 4 are welded in this manner, the molten resin (welding burr) is formed between the radially inner burr receiving portion 17 and the burr receiving portion 17 as shown in FIG. It is received by the radially outer second burr receiving portion 35 . At this time, since the gap between the outer peripheral surface of the annular base portion 18 of the inner peripheral wall 4c and the peripheral wall 2b of the module case 2 is set to be sufficiently small, the molten resin that has flowed into the burr receiving portion 17 will reach the position of the sealing member 21. It does not flow into the part where it is exposed.

(Effect of embodiment)
As described above, in the fuel pump module 1 of the present embodiment, the molten resin (welding A burr receiving portion 17 for receiving burrs is formed. Therefore, it is possible to realize smooth welding between the module case 2 and the first module cover, and to suppress deterioration of the appearance due to adhesion of burrs.

Further, the fuel pump module 1 of the present embodiment has an annular opening that seals between the first module cover 4 and the module case 2 on the side of the pump accommodating chamber 12 from the welded fixing portion between the first module cover 4 and the module case 2 . A seal member 21 is arranged. Therefore, fuel leakage from the opening 3 side of the module case 2 can be prevented doubly, and fuel leakage can be suppressed even if deterioration should occur in the welded portion. Furthermore, in the case of the present embodiment, the sealing member 21 can prevent the fuel in the pump housing chamber 12 from directly contacting the welded portion, so that deterioration of the welded portion due to the fuel can be suppressed.

Further, in the fuel pump module 1 of this embodiment, the chamfered portion 2d is arranged on the inner peripheral edge portion of the axial end surface 2c of the module case 2, so that the first module cover 4 is assembled to the module case 2 before welding. When attaching, it is possible to prevent the edge of the sealing member 21 attached to the inner peripheral wall 4c of the first module cover 4 from contacting the inner peripheral edge of the axial end surface 2c of the module case 2 . Therefore, when the fuel pump module 1 of this embodiment is employed, damage to the seal member 21 during assembly can be suppressed.

Further, in the fuel pump module 1 of the present embodiment, since it is possible to prevent the seal member 21 from coming into contact with the inner peripheral edge of the axial end surface 2c of the module case 2 during assembly, the annular base 18 of the inner peripheral wall 4c can be suppressed. and the inner peripheral surface of the opening 3 can be sufficiently narrowed. That is, when the gap between the annular base portion 18 of the inner peripheral wall 4c and the inner peripheral surface of the opening 3 is narrowed and the edge of the sealing member 21 abuts against the module case 2, an escape space (deflection space) of the sealing member 21 is provided. ) is almost eliminated, the damage to the sealing member 21 is increased. However, in the case of the fuel pump module 1 of this embodiment, since the edge of the sealing member 21 does not come into contact with the module case 2, the sealing member 21 is not greatly damaged during assembly. Therefore, the gap between the annular base portion 18 of the inner peripheral wall 4c and the inner peripheral surface of the opening 3 can be sufficiently narrowed.
Therefore, when the fuel pump module 1 of the present embodiment is employed, it is possible to prevent the melted resin from flowing out toward the sealing member 21 during welding, thereby protecting the sealing member 21 from the heat of the molten resin. .

Further, in the fuel pump module 1 of the present embodiment, the chamfered portion 2d is arranged on the inner peripheral edge portion of the axial end surface 2c of the module case 2, so that the welded portion of the axial end surface 2c of the module case 2 is They are spaced radially outward of the seal member 21 across the chamfered portion 2d. Therefore, when laser welding is performed on the abutting portions of the module case 2 and the first module cover 4 , it is possible to prevent the seal member 21 from being irradiated with the laser beam of the laser welding machine. Therefore, when the fuel pump module 1 of this embodiment is employed, damage to the seal member 21 during laser irradiation can also be suppressed.

Further, in the fuel pump module 1 of this embodiment, the length L1 of protrusion of the outer peripheral wall 4d of the first module cover 4 from the welding wall 4b is set longer than the length L2 from the welding wall 4b to the seal holding portion 22. It is Therefore, when the first module cover 4 is assembled to the one end side of the module case 2 in the axial direction, the protruding end side of the outer peripheral wall 4d of the first module cover 4 is placed on the outer periphery of the one end side of the module case 2 in the axial direction. The first module cover 4 can be centered with respect to the module case 2 by engaging the surfaces. Therefore, when the fuel pump module 1 of the present embodiment is adopted, the assembly of the first module cover 4 and the module case 2 can be facilitated, and the seal member 21 is positioned on the axial end face of the module case 2. contact from an unexpected position or direction.

Furthermore, in the fuel pump module 1 of this embodiment, the space between the inner peripheral surface of the outer peripheral wall 4d on the side of the first module cover 4 and the outer peripheral surface of the peripheral wall 2b on the side of the module case 2 is the module case 2 and the first module cover 4. It constitutes a second burr receiving portion 35 for receiving the welding burr of the welded portion. Therefore, when the module case 2 and the first module cover 4 are welded together, the amount of molten resin flowing into the burr receiving portion 17 on the inner peripheral edge of the peripheral wall 2b can be reduced. Therefore, it is possible to further suppress the molten resin generated during welding from flowing in the direction of the seal member 21 .

Further, in the fuel pump module 1 of this embodiment, a protective wall 32 is integrally formed on the outer peripheral surface of the module case 2 at one end in the axial direction so as to face the end surface of the outer peripheral wall 4 d of the first module cover 4 . . Therefore, when an external object advances toward the axial end face of the outer peripheral wall 4d of the first module cover 4, the protective wall 32 prevents the external object from directly contacting the end face of the outer peripheral wall. can be avoided. Therefore, when this configuration is adopted, it is possible to prevent the first module cover 4 from receiving a load in the direction of detachment from the module case 2 due to contact with an external object or the like.

Further, in the fuel pump module 1 of this embodiment, the protruding end 4e of the inner peripheral wall 4c of the first module cover 4 abuts against the outer peripheral edge of the passage block 23 to restrict displacement of the passage block 23. constitutes Therefore, the projecting end 4e of the inner peripheral wall 4c can suppress rattling of the passage block 23, and the gap d between the central region of the passage block 23 and the rear surface of the first module cover 4 can be accurately managed. be able to. Therefore, a necessary and sufficient space is secured between the central region of the passage block 23 and the rear surface of the first module cover 4, and transmission of vibrations and operating noise of the pump body 11 to the first module cover 4 is suppressed. can do.

The present invention is not limited to the above-described embodiments, and various design changes are possible without departing from the gist of the present invention.

REFERENCE SIGNS LIST 1 fuel pump module 2 module case 2d chamfered portion 3 opening 4 first module cover (module cover)
4a... Base wall 4b... Welding wall 4c... Inner peripheral wall 4d... Outer peripheral wall 4e... Protruding end 11... Pump main body 17... Burr receiving part 21... Seal member 22... Seal holding part 23... Passage block (contents)
32... Protective wall 35... Second burr receiving portion

Claims (5)

a substantially cylindrical module case having an opening at one end in the axial direction;
a pump body housed inside the module case;
a module cover that is fixed to one axial end of the module case and closes the opening;
an annular seal member interposed between the module case and the module cover;
The module case has a chamfered portion on the inner peripheral edge portion of the end face on one end side in the axial direction,
The module cover is
a base wall covering the opening;
an annular welding wall positioned on the outer peripheral edge of the base wall and to which the end face of the module case on one axial end side is welded and fixed;
an inner peripheral wall projecting cylindrically from a radially inner position of the welding wall and inserted into the opening;
The inner peripheral wall has a seal holding portion that holds the seal member closer to the protruding end than the base end,
Between the outer peripheral surface of the inner peripheral wall and the chamfered portion, the outer peripheral surface of the inner peripheral wall and the chamfered portion cooperate to receive the welding burr of the welded portion between the end face of the module case and the welding wall. A burr receiving part is formed to
The fuel pump module, wherein the sealing member is in contact with the outer peripheral surface of the inner peripheral wall and the inner peripheral surface of the opening. 2. The fuel pump module of claim 1, wherein
The module cover has an outer peripheral wall that protrudes in a cylindrical shape from a radially outer position of the welding wall and covers an outer peripheral surface of the module case on one end side in the axial direction,
A fuel pump module, wherein a length of protrusion of the outer peripheral wall from the welded wall is set longer than a length from the welded wall to the seal holding portion. A second burr receiving portion is formed between the inner peripheral surface of the outer peripheral wall and the outer peripheral surface of the module cover for receiving a welding burr at the welded portion between the end surface of the module case and the welding wall. 3. The fuel pump module of claim 2, wherein: In the fuel pump module according to claim 2 or 3,
The fuel pump module, wherein the module case has a protective wall that protrudes radially outward from an outer circumferential surface near one end in the axial direction and faces an end surface of the outer circumferential wall. In the fuel pump module according to any one of claims 1 to 4,
a content assembled inside the module case so as to face the base wall of the module cover;
A fuel pump module, wherein a protruding end of the inner peripheral wall forms a displacement restricting portion that abuts against an outer peripheral edge of the content to restrict displacement of the content.

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