JP6505189B1 - Fuel supply system - Google Patents

Abstract

An object of the present invention is to obtain a highly reliable fuel supply device without causing cracks and the like even if the internal pressure changes frequently. A case body 2 includes butt ends 21fp of outer peripheral portions 21p and 22p of two molded bodies divided by a horizontal cutting surface so as to be divided into a top surface 8ft side and a bottom surface 8fb side of a communication flow channel 8t. , 22 fp, and in each of the two moldings, intermediate wall portions 21 wm and 22 wm are formed on the bottom surface 8 fb or top surface 8 ft of the communication flow channel 8 t and project from the middle portion of the flow channel width The butt ends 21 fm and 22 fm of the intermediate wall portions 21 wm and 22 wm are also configured to be joined to each other when the butt ends of the outer peripheral portion are welded. [Selected figure] Figure 1

Description

  The present invention relates to a type of fuel supply apparatus which sucks fuel from a fuel tank and pressurizes and supplies it to a fuel consuming apparatus such as an engine, which is inserted from an opening in a bottom of the tank.

  Among fuel supply devices for vehicles, a fuel supply device for a motorcycle is assumed to be inserted into the tank from the bottom of the tank and installed so as to stand up from the bottom of the tank because of the structure of the fuel tank. In such a fuel supply device, a case body containing a pump, a filter, and the like is fitted into a flange-like lid member fixed in a fluid-tight manner to the opening of the tank bottom.

  The main body of the case is a pump, a primary filter for filtering the fuel drawn by the pump, a high pressure filter for filtering the fuel pressurized by the pump, and the excess fuel discharged from the pump. A member such as a back pressure valve is accommodated. Among them, the pump and the high pressure filter are bulky members which can not break the cylindrical form, and can not be arranged in a straight line due to the restriction of the tank height.

  Therefore, the high-pressure filter is arranged side by side horizontally with respect to the pump that needs to be disposed so as to suck up from below and discharge upward, so that it is folded back from the pump to the high-pressure filter above the case body member It is necessary to form a communication channel in the On the other hand, since the case body can not be integrally molded including the communication flow channel for the convenience of incorporation of a pump, a filter, etc., the case separately integrated by welding so as to be divided at the communication flow channel portion It forms a body (see, for example, Patent Document 1).

JP, 2011-117323, A (paragraph 0013-0027, FIGS. 1-4)

  In the integration by welding as described above, the bonding area is secured by making the thickness of the outer peripheral portion surrounding the communication flow passage a predetermined value or more, and the internal pressure of several hundred kPa can be tolerated. However, in a fuel consuming device such as an engine in a vehicle, the frequency of operation stoppage is high, and accordingly, the internal pressure applied to the flow path also changes frequently. Therefore, the wall surface of the flow path including the joint portion is curved or returns to the original state, fatigue of the joint portion is accumulated, the strength is reduced, and the generation of a crack or the like is a concern.

  The present invention has been made to solve the problems as described above, and has an object of obtaining a highly reliable fuel supply device without generating cracks and the like even if the internal pressure changes frequently.

The fuel supply apparatus of the present invention, a motor portion and a pump portion is directly connected in the axial direction, and has a fuel flow path through the motor section, suction write port of the fuel on one side of the axis direction, on the other side A fuel pump having a pressurized fuel discharge port, a cylindrical high-pressure filter that is cylindrical and purifies fuel radially discharged from the fuel pump with respect to a filter medium, and a fuel tank A lid member fixed to the opening on the bottom side of the housing and the lid member held by the lid member so as to stand up from the lid member, and the shaft of the fuel pump is accommodated so as to open the discharge port upwards; A first accommodation space, a second accommodation space horizontally adjacent to the first accommodation space, and axially accommodating the high pressure filter such that the fuel inlet is open at the upper side; It extends horizontally above the second accommodation space, Serial and discharge port and the inlet and resin case body forming a communication passage for communicating the, wherein the communication passage, along vertical cross section a rectangular in the flow direction, wherein at the bottom side An insertion opening for inserting a high-pressure filter is open, and the case body is an outer peripheral portion of two moldings divided by a horizontal cutting surface so as to be divided into a top surface side and a bottom surface side of the communication channel. An intermediate wall portion projecting from an intermediate portion of the channel width is formed on each of the two molded bodies on the bottom or top surface of the communication channel, The butt ends of the parts are also joined to each other during welding of the butt ends of the outer peripheral portion.

  According to the fuel supply device of the present invention, since the intermediate wall portion connecting the top surface and the bottom surface is provided at the middle portion in the width direction of the linear flow path, deformation of the wall surface when pressure changes is suppressed. Even if the internal pressure changes frequently, a highly reliable fuel supply device can be obtained without the occurrence of cracks or the like.

It is a figure which shows the state before welding of two members which comprise the case body in the fuel supply apparatus concerning Embodiment 1 of this invention. It is a flowchart which shows the installation state in the tank of the fuel supply apparatus concerning Embodiment 1 of this invention. FIG. 1 is a perspective view of a fuel supply device according to a first embodiment of the present invention. 1 is a plan view of a fuel supply device according to a first embodiment of the present invention. It is sectional drawing of the main-body part which comprises the case body in the fuel supply apparatus concerning Embodiment 1 of this invention. It is sectional drawing parallel to the axial direction and communication flow path of the fuel supply apparatus concerning Embodiment 1 of this invention. It is sectional drawing perpendicular | vertical to the communication flow path of the fuel supply apparatus concerning Embodiment 1 of this invention. It is a perspective view which shows a mode that a high voltage | pressure filter is integrated in the case body of the fuel supply apparatus concerning Embodiment 1 of this invention. It is a perspective view of the case body of the fuel supply apparatus concerning Embodiment 1 of this invention.

Embodiment 1
FIGS. 1 to 9 are for explaining the configuration of the fuel supply device according to the first embodiment of the present invention, and FIG. It is the figure seen from each welding side side before welding of a part and a cover part. FIG. 2 is a flow diagram also showing a schematic cross-sectional view for explaining the relationship between the flow path system of the fuel and the components when the fuel supply device is installed in the fuel tank, and FIGS. 3 and 4 are each a fuel supply device Is a perspective view and a plan view when viewed from above. FIG. 5 is a cross section of the main body constituting the case body, and the cutting position corresponds to the line A-A in FIG.

  6 is a cross-sectional view taken along the line B-B in FIG. 4 and is a cross-sectional view parallel to the axial direction of the fuel supply device and the communication flow path. FIG. 7 is a cross-sectional view taken along the line C-C in FIG. It is sectional drawing perpendicular | vertical to a communicating flow path. 8 is a perspective view showing how a high pressure filter is incorporated into the main body of the case body of the fuel supply device, and FIG. 9 is as shown in FIG. 1 after the high pressure filter is incorporated into the main body as shown in FIG. It is a perspective view of the case body which welded and formed the cover body.

  The fuel supply device according to the first embodiment of the present invention supplies fuel to, for example, a fuel consumption device such as an engine mounted on a vehicle. Therefore, as a basic configuration, as shown in FIG. 2, the suction filter 4 for removing contaminants in the fuel 990 and the fuel 990 in the fuel tank 920 via the suction filter 4 are sucked, pressurized and discharged. The fuel pump 5 is provided. Then, for example, the high-pressure filter 6 for removing impurities and the like in the high-pressure fuel generated in the fuel pump 5, and the fuel 990 which was not consumed by the fuel consumption device such as the engine 910 while maintaining the pressure And a back pressure valve 7 for returning to the

  In particular, as in the case of a motorcycle, the fuel supply device 1 according to the present embodiment is inserted into the tank through an opening provided on the bottom side of the fuel tank and installed so as to stand up from the inner bottom surface of the fuel tank. It is assumed that Therefore, as shown in FIG. 3 and FIG. 4, the cover 3 for fixing to the opening (not shown) of the bottom of the fuel tank 920 and the lower part are fixed to the cover 3 and arranged so as to rise upward. The case 10 is formed by the case body 2 to be formed.

  The lid member 3 has a cylindrical shape with a bottom, and is formed to stand up to the disk-like flange 3f functioning as a lid of the tank opening and the flange 3f, and supports the case body 2 and also as a sub tank And a cylindrical support 3s that functions. And it is integrally molded by resin, such as polyacetal (POM: Poly Oxy Methylene), including the electrical connector which does not attach discharge piping 3e for supplying a fuel to the fuel consumption apparatus out of a tank, and a code | symbol.

  The case body 2 is supported by the lid member 3 and is welded to the main body portion 21 accommodating the main device as a pump and the main body portion 21 so that the inflow port of the high pressure filter 6 from the discharge port 5 x of the fuel pump 5 It comprises with the cover part 22 which forms the communication flow path 8t (FIG. 2) folded back to 6i. The main body portion 21 and the cover portion 22 are formed by molding a resin such as POM in the same manner as the lid member 3. Although it is not necessary to form the same material, it is desirable to configure so as to be a combination of materials having similar thermal properties and having mutual affinity so as to enable good welding.

  As shown in FIG. 5, the main body portion 21 includes a pump space 21sp opened downward to accommodate the fuel pump 5, and a high pressure filter space 21sf opened upward to accommodate the high pressure filter 6. Have. An attachment hole 2jp for the fuel pump 5 is formed in the upper part of the pump space 21sp, and an attachment hole 2jf for the high pressure filter 6 is formed in the lower part of the high pressure filter space 21sf. The upper part is opened from the upper partition 21wt connected to the mounting hole 2jp for the fuel pump 5, and below the mounting hole 2jf for the high pressure filter 6, a communication hole communicating with the discharge piping 21e is formed as the discharge flow path 8e. It is done.

  The cylindrical partition 21wf that forms the high pressure filter space 21sf and the flat partition 21wt that communicates with the partition 21wf at the upper part form a substantially cylindrical partition that forms the pump space 21sp in order to ensure the strength against the pressure difference. It is thicker than 21 wp. Then, the end face of the partition wall (peripheral portion 21p) surrounding the periphery extends to the same plane above the flat partition wall 21wt, and a welding surface (referred to as a butt end 21fp) is formed.

  Furthermore, the surface on the front side of the partition wall 21wt (bottom surface 8fb of the communication flow channel 8t) connecting the mounting hole 2jp for the fuel pump 5 and the opening portion of the high pressure filter space 21sf is shown in FIGS. Thus, a space for forming the communication flow channel 8t is formed. An intermediate wall portion that protrudes from the bottom surface 8fb (partition 21wt) of the flow passage to the same plane as the butt end 21fp and extends along the flow passage at an intermediate portion in the flow passage width direction of the communication flow passage 8t. 21 wm is formed. The cut surface of FIG. 6 is on the near side of the cut surface of FIG. 5, and a mounting hole 2jr for the back pressure valve 7 opened downward for mounting the back pressure valve 7 is drawn.

  The cover portion 22 forms the case body 2 which is a joined body with the main body portion 21 by welding to form the communication flow passage 8t, and as shown in FIG. It has an oblong bottomed rectangular shape having the same outer shape in a plane perpendicular to the part of and the axis. Then, a butt end 22fp corresponding to the butt end 21fp of the main body portion 21 and an annular butt end 22fj corresponding to the butt end 6fj of the annular projection portion 21cu of the high-pressure filter 6 fitted into the main body portion 21 are formed. It has an annular wall 22j. Furthermore, in order to correspond to middle wall 21wm of main part 21, it has middle wall 21wm which protrudes from top face 8ft of communicating channel 8t. A rib extending along the width direction and the flow direction is formed from the top surface 8ft of the cover portion 22 to a portion of a predetermined height not reaching the butt end 22fp of the outer peripheral portion 22p. The intermediate wall portion 22 wm is formed to extend a part of the rib extending along the flow direction to the height of the butt end 22 fp.

  Next, a flow channel system of fuel constituted by the above-described parts and the like will be described. In the housing 10, as shown in FIG. 2 and FIGS. 6 and 7, the suction filter 4 for removing contaminants in the fuel 990, and the fuel 990 in the fuel tank 920 via the suction filter 4 A fuel pump 5 that sucks, pressurizes and discharges is arranged in line in a straight line. A communication passage 8 t is formed at the top of the case body 2 to change the direction of the flow of fuel discharged from the fuel pump 5 from upward to horizontal and further downward. For the fuel 990 whose flow is changed downward by the communication passage 8t, the fuel not consumed by the fuel consumption device such as the engine 910 and the like is discharged while maintaining the pressure while the fuel 990, such as the engine 910, is removed. The back pressure valve 7 is disposed in line with the fuel pump 5 in a straight line. An oil level detection gauge (not shown) is provided outside the housing 10.

  On the other hand, in the vicinity of the upper end portion of the support portion 3s functioning as a sub tank, a gap 8g communicating with the fuel tank 920 is formed between the case body 2 and the fuel 990 stored in the fuel tank 920. You can come and go freely as long as you don't have it. Thus, a fuel flow path system is formed in the housing 10 from the fuel tank 920 to the engine 910 (a fuel control device such as an injector for injecting fuel to the engine is also collectively referred to as the engine 910). . Specifically, a suction filter 4 for removing fuel contamination in the sub tank, a fuel pump 5 for sucking, pressurizing, and discharging the fuel purified by the suction filter 4, and a high pressure filter 6 for purifying the pressurized fuel The fuel flow path 8 is formed from the suction filter 4 to the engine 910 which is a fuel consumption device downstream thereof.

  In the downstream portion of the high-pressure filter 6 which is an intermediate portion of the fuel flow passage 8, a return flow passage 8r for returning the surplus fuel not consumed by the engine 910 among the fuel discharged by the fuel pump 5 into the sub tank. It is formed. In the fuel flow passage 8, the return flow passage 8r communicates with the back pressure valve 7, and the portion (discharge flow passage 8e) directed to the other fuel consuming device communicates with the discharge pipe 3e.

  The fuel pump 5 has a pump unit connected directly to the rotary shaft of a motor unit (not shown), and the motor unit and the pump unit are arranged along the rotary shaft and sucks from one end side in the axial direction and discharges at the other end side It is configured as follows. Therefore, the flow path through which the fuel flows along the axial direction in the motor unit is formed. In addition, it has a cylindrical shape as a whole and requires a predetermined length in the axial direction.

  The high-pressure filter 6 has a cylindrical shape in consideration of the pressure resistance of the housing 10, and a filter material capable of transmitting fuel is, for example, disposed on the circumference while being bent to form a chrysanthemum shape, and is radially outside The fuel is configured to permeate from the inside to the inside. From the viewpoint of pressure resistance and the balance with the diameter of the fuel pump 5 aligned in the horizontal direction, the diameter can not be made extremely large and the high pressure filter 6 also needs to have a predetermined length in the axial direction in order to secure the filtration area. It becomes.

  The back pressure valve 7 is a valve for keeping the pressure on the primary side constant, and when the pressure on the primary side exceeds a predetermined value, the valve opens to discharge the fuel 990 into the internal space functioning as a sub tank of the housing 10 It is configured to close when it is below the value.

  On the other hand, the suction filter 4 is covered on the entire surface with a filter material formed of a non-woven fabric or the like through which fuel can permeate, and when the fuel 990 flows into the interior, it removes contaminants and discharges the clean fuel 990.

  The incorporation of these members into the housing 10 will be described. The high-pressure filter 6 is inserted before the cover 22 is welded to the main body 21 of the case body 2 as shown in FIG. 8 and opens above the main body 21 (on the bottom surface 8fb of the communication flow path 8t). It is inserted into the high pressure filter space 21sf from the port 21h. Then, as shown in FIG. 6, a discharge port 6x fitted in the mounting hole 2jf and provided on the inner peripheral portion on the lower end side of the high pressure filter 6 opens in the fuel flow passage 8 provided in the main body portion 21. . However, by inserting a sealing material 6s such as an O-ring between the outer peripheral surface of the lower annular projection 6cd and the mounting hole 2jf, the inside from the outer peripheral side (primary side) in the vicinity of the discharge port 6x The fuel is prevented from leaking before filtration to the circumferential side (secondary side).

  And as shown in FIG. 1, the cover part 22 and the main-body part 21 are welded. At this time, the communication channel 8t is formed by welding the butt end 21fp of the outer peripheral portion 21p of the main body portion 21 and the butt end 22fp of the outer peripheral portion 22p of the cover portion 22. By welding the upper annular butt end 6fj of the high pressure filter 6 fitted in the main body portion 21 and the butt end 22fj of the cover portion 22, the gap between the outer peripheral surface of the high pressure filter 6 and the inner surface of the partition 21wf is fixed. It becomes the inlet 6i of the filter 6. Further, the fuel is prevented from dropping from the outer peripheral side (primary side) to the inner peripheral side (secondary side) in the vicinity of the inlet 6i.

  Furthermore, an intermediate wall 21wm provided parallel to the flow passage provided in the main body 21 and an intermediate wall 22wm provided parallel to the flow passage provided in the cover 22, which are features of the present invention Butt ends 21fm and 22fm are welded together. Thereby, in the communication flow channel 8t, in a straight section with a rectangular cross section perpendicular to the flow and no change in flow, a partition extending parallel to the flow channel so as to divide the flow in the middle portion of the flow channel width. Will be formed.

  Thus, with respect to the housing 10 formed as shown in FIG. 9, the fuel pump 5 faces the suction port 5i downward in the drawing and the discharge port 5x in the drawing as shown in FIGS. It is inserted from the opening 2 h and installed so that the rotation axis is close to vertical so as to open upward. At this time, in the fuel pump 5, the discharge port 5x is fitted in the mounting hole 2jp of the case body 2 through a sealing material 5s such as an O-ring, and the fuel pump 5 is connected in a fluid-tight manner. On the other hand, the suction port 5i of the fuel pump 5 is connected to the suction filter 4 by using a relay member without a reference numeral.

  The back pressure valve 7 is branched as a return flow path 8r in the vicinity of the discharge port 6x and fitted in a mounting hole 2jr provided in the main body 21 so as to open downward, and liquid tight by a sealing material 7s such as an O ring. It is maintained and connected to the outlet 6x of the high pressure filter 6.

  Thereafter, the fuel pump 5, the suction filter 4, and the back pressure valve 7 are fixed by fitting the case body 2 into the lid member 3. At this time, in the vicinity of the discharge port 6x of the high-pressure filter 6, the discharge pipe 21e to be the discharge flow path 8e is connected to the discharge pipe 3e formed in the lid member 3 via a seal member not shown. Thereby, the fuel flow path 8 described in FIG. 2 is constructed in the housing 10.

Based on the configuration described above, the operation of the fuel supply device 1 will be described.
In the fuel tank 920, for example, when the fuel 990 is sufficiently stored such that the liquid level is above the gap 8g in FIG. Is filled with In this state, when an electric current is supplied to the fuel pump 5, an impeller (not shown) rotates with an internal rotor with a shaft (not shown) in the fuel pump 5 as a rotation shaft. Along with this rotation, the fuel 990 in the sub tank is cleaned of impurities by the suction filter 4, introduced into the fuel pump 5, pressurized and discharged into the communication passage 8t. The discharged boosted fuel passes through the filter from the outer peripheral side of the high pressure filter 6 and flows into the inner peripheral side, and is supplied to the engine 910 from the discharge port 6x through the discharge pipe 3e.

  On the other hand, the surplus fuel 990 which can not be consumed by the engine 910 is returned from the back pressure valve 7 to the internal space functioning as a sub tank through the return flow passage 8 r branched from the fuel flow passage 8. Then, the back pressure control function of the back pressure valve 7 keeps the supply pressure to the engine 910 at a predetermined value. As a result, even if the amount consumed by the engine 910 suddenly changes, it is possible to supply the amount of fuel 990 required by the engine 910 at a constant pressure. In addition, in the back pressure valve 7, since a rapid pressure fluctuation arises, air bubbles may be generated. Therefore, not only liquid fuel but also air bubbles are discharged into the inner space functioning as a sub tank, but since it escapes from the gap 8g, it is possible to suck in fuel containing no air bubbles from the suction filter 4.

  At this time, in the case body 2, high-pressure fuel flows inside in the section downstream of the mounting hole 2 jp of the fuel pump 5, upstream of the discharge pipe 21 e and upstream of the mounting hole 2 jr of the back pressure valve 7. . On the other hand, in the case body 2, a portion on the upstream side of the mounting hole 2 jp of the fuel pump 5 or a portion on the downstream side of the mounting hole 2 jr of the back pressure valve 7 has normal pressure. That is, a pressure difference is generated between the wall surface surrounding the communication flow passage 8t and the wall surface accommodating the high pressure filter 6 with the outside.

  On the other hand, in the main body portion 21 and the cover portion 22, as described above, the wall material surrounding the high-pressure filter space 21sf and the thickness of the wall material disposed above the partition wall 21wt take pressure resistance into consideration. And is thicker than the other parts. Therefore, there is no possibility of damage just by applying the pressure required to supply the engine 910. Further, the joint strength is designed to withstand the assumed pressure only with the welding areas of the butt ends 21fp and 22fp of the outer peripheral portions 21p and 22p. Therefore, the start of the fuel supply device 1 does not cause the main body portion 21 and the cover portion 22 to immediately separate at the joint J2 even when the internal pressure is increased.

  However, in the fuel supply system 1 for vehicles, the pressure does not constantly apply, and the pressure changes each time the engine is started and stopped. At that time, in the high pressure filter 6 portion, the partition wall 21 wf has a cylindrical shape and has a circular cross section. Therefore, even if the internal pressure is applied, the members only extend uniformly, and the curvature does not change significantly. In addition, even if the both ends of the cylinder are flat, since they are reinforced by the adjacent curved side surfaces, the curvature is not significantly deformed at both end portions.

  On the other hand, the space to be the communication flow passage 8t is formed by welding two members, but the butt ends to be the joint J2 are along the joining direction so that there is no deformation due to softening during welding. Need to be curvilinear. That is, the portion crossing the seam J2 needs to be formed flat. Then, since most of the outer peripheral portions 21p and 22p along the flow path are linearly formed, of the side surfaces of the communication flow path 8t, the portion along the flow path is flat.

  Therefore, when an internal pressure is applied, the joint J2 portion is not only extended, but a force is exerted to deform so that the cross section perpendicular to the flow path becomes concave or convex. Of course, as described with reference to FIG. 1, the top surface 8 ft of the cover portion 22 is formed with a rib extending along the channel width direction to a portion of a predetermined height not reaching the butt end 22 fp. It functions to suppress the deformation of the wall material forming 8 ft and the deformation of the wall material of the side surface 22s part connected to the joint J2.

  However, since the ribs extend in the direction of closing the flow path, they need to be recessed to a certain distance or more behind the butt end 22fp, and the deformation suppressing effect is limited. Further, welding of the high-pressure filter 6 and the cover 22 does not contribute to fixing the positions of the cover 22 and the main body 21. Therefore, when joining of the case body 2 is performed only by the outer peripheral portions 21p and 22p, the deformation due to the internal pressure and the restoration due to the release of the pressure are repeated in the vicinity of the joint J2 each time the start and stop are performed.

  It is not impossible to keep the joint strength at the joint J2 at a certain level or more by devising the temperature control and pressing pressure at the time of welding. However, even if welding can be performed firmly, the mechanical properties of the joint J2 may change discontinuously if the joint J2 has higher or lower rigidity compared to the integrally formed peripheral part. Therefore, in the case of deformation, stress is concentrated at the joint J2 or a portion immediately thereabout. Therefore, it is necessary to consider the possibility of occurrence of a fuel leak or the like, which may cause the occurrence and progress of a crack at or near the seam J2 due to repeated deformation and restoration.

  Therefore, in the fuel supply device 1 according to the embodiment of the present invention, among the ribs to be projected from the top surface 8ft of the cover portion 22, a part of the rib extending along the flow path is extended to the butt end 22fp to form an intermediate wall portion I formed 22 wm. Corresponding to that, on the surface of the partition wall 21wt of the main body portion 21, an intermediate wall portion 21wm projecting from the bottom surface 8fb is formed. Thereby, the main body portion 21 and the cover portion 22 are fixed by the solid wall material at the middle portion of the flow path width, and the deformation of the top surface 8 ft of the cover portion 22 is almost completely suppressed in any direction it can. Therefore, the positions of the top surface 8ft and the bottom surface 8fb which are both ends of the side surface 22s are completely fixed, and the deformation of the side surface 22f can be sufficiently suppressed.

  In other words, in a straight channel where there is no seal or change in the flow direction and no support material is required as the flow channel, an intermediate wall (ribs connected by welding) extending along the flow to the middle part in the width direction and the flow direction I dare to form. As a result, it is possible to prevent fuel leakage from the seam J2 or the immediate portion thereof, and a highly reliable fuel supply system can be obtained.

  The present invention is not limited to the above embodiment, and modifications can be made without departing from the scope of the present invention. For example, the middle wall portion 22wm may be protruded separately from the rib. The number of intermediate wall portions 21wm and 22wm is not limited to one, and may be divided into a plurality along the flow direction, or a plurality may be provided in the flow direction. Further, in consideration of pressure loss, it is preferable to extend linearly, but it may be formed in a curved shape or a bent shape or meandering. There is no limitation on the length in the flow direction, but it is closer to the discharge opening 5x with respect to the center of the straight line connecting the discharge opening 5x of the fuel pump 5 and the insertion opening 21h of the high pressure filter 6 at the shortest It is desirable that there be joints between the butt ends 21fm and 22fm on the side and the side close to the insertion opening 21h, respectively.

  As described above, according to the fuel supply device 1 according to the first embodiment of the present invention, the motor unit and the pump unit directly connected in the axial direction, and the fuel flow path passing through the motor unit The fuel pump 5 is provided with a fuel suction port 5i on one side and a fuel discharge port 5x pressurized on the other side, and has a cylindrical shape, and the fuel discharged from the fuel pump 5 has a diameter relative to the filter medium The cylindrical high-pressure filter 6 that transmits and cleans in the direction, the lid member 3 fixed to the opening on the bottom side of the fuel tank 920, and the lid member 3 so as to stand up from the lid member 3 The first accommodation space (pump space 21sp) for accommodating the fuel pump 5 upright so that the fuel pump 5 opens upward, and the first accommodation space horizontally adjacent to the first accommodation space, and the fuel inlet 6i opens upward The high-pressure filter 6 so that A resin that extends horizontally in the upper side of the second accommodation space (the high pressure filter space 21sf) and the first accommodation space and the second accommodation space, and forms a communication channel 8t that communicates the discharge port 5x with the inflow port 6i. The communication channel 8t has a rectangular cross section perpendicular to the flow direction, and an insertion port 21h for inserting the high-pressure filter 6 is opened on the bottom surface 8fb side, and the case 2 is The butt ends of the outer peripheral portions 21p and 22p of two molded bodies (the main body portion 21 and the cover portion 22) divided by a horizontal cutting surface so as to be divided into the top surface 8ft side and the bottom surface 8fb side of the communication flow channel 8t. 21 fp and 22 fp are joined bodies by welding, in each of the two molded bodies, in the bottom surface 8 fb or top surface 8 ft of the communication flow channel 8 t, intermediate wall portions 21 wm and 22 wm projecting from the middle portion of the flow channel width Made is, intermediate wall portion 21Wm, butted end 21fm of 22wm, 22fm also during the welding of the butt end of the outer peripheral portion, and configured as being joined together. As a result, despite having a flat-plate-like structure, the bottom rib 8fb which is the surface of the partition 21wt having high rigidity by maintaining the structure at the lower part maintains the shape of the top 8ft which can not be sufficiently reinforced with imperfect ribs. can do. As a result, even if there is pressure fluctuation, the positions and angles of both end portions of the side face are fixed, and the curvature of the side face portion including the seam J2 is not extremely changed or bent, without generating cracks or the like. A highly reliable fuel supply device 1 can be obtained.

  In particular, since each of the intermediate wall portions 21wm and 22wm is configured to extend in the flow direction, it has a rectifying effect rather than disturbing the flow of fuel in the communication flow passage 8t. Further, the positional relationship between the top surface 8 ft and the bottom surface 8 fb can be more firmly maintained by the support along the flow direction formed by the junction of the intermediate wall portions 21 wm and 22 wm, and the stress on the joint J 2 can be reduced.

  Furthermore, since the intermediate wall portions 21wm and 22wm connect the butt ends 21fm and 22fm in the flow direction, respectively in the portion closer to the insertion opening 21h than the discharge opening 5x and in the portion closer to the discharge opening 5x than the insertion opening 21h The positional relationship between the bottom surface 8fb and the top surface 8ft is fixed at the main portion of the communication flow path, and stress on the joint J2 can be reduced.

1: Fuel supply device 2: Case body 3: Lid member 5: Fuel pump
5i: suction plug mouth, 5x: discharge port, 6: high-pressure filter, 6i: flow inlet,
8fb: bottom, 8ft: top, 8t: communicating channel, 21: main body,
21fm: butt end, 21fp: butt end, 21h: insertion port,
21p: outer periphery, 21wm: middle wall, 22: cover,
22fm: butt end, 22fp: butt end, 22p : outer peripheral portion,
22 wm: middle wall, 920: fuel tank, 990: fuel.

Claims (3)

A motor unit and a pump unit directly connected in the axial direction, and a fuel flow passage passing through the motor unit;
Suction write port of the fuel on one side of the axial direction, a fuel pump discharge port of pressurized fuel to the other side is provided,
A cylindrical high-pressure filter which is cylindrical and purifies the fuel discharged from the fuel pump radially through the filter medium;
A lid member fixed to the opening on the bottom side of the fuel tank;
A first accommodation space, which is held by the lid member so as to stand up from the lid member and holds the fuel pump upright so that the discharge port opens upward, and in a direction parallel to the first accommodation space A second accommodation space adjacently accommodating the high pressure filter so that the fuel inlet is opened upward, and extends horizontally above the first accommodation space and the second accommodation space, It includes a resin case body forming a communication passage for communicating the discharge port and said inlet, and
The communication channel has a rectangular cross section perpendicular to the flow direction, and an insertion port for inserting the high-pressure filter is opened on the bottom surface side,
The case body is a joined body by welding of butt ends of outer peripheral portions of two molded bodies divided by a horizontal cutting surface so as to be divided into a top surface side and a bottom surface side of the communication channel,
Each of the two molded bodies is provided with an intermediate wall portion projecting from an intermediate portion of the channel width on the bottom or top surface of the communication channel, and the butt end of the intermediate wall is also a butt of the outer peripheral portion A fuel supply device, which is joined to one another during welding of the ends.   The fuel supply device according to claim 1, wherein each of the middle wall portions extends in the flow direction. The butt ends of the intermediate wall portion are joined at each of a portion closer to the insertion port than the discharge port and a portion closer to the discharge port than the insertion port in the flow direction. The fuel supply apparatus according to claim 1 or 2.

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