JP2013124629A - Fuel pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress electrolytic corrosion of terminals in a fuel pump.SOLUTION: The fuel pump includes a housing 32, a first terminal 62 and a second terminal 64 which are provided on a first plane in the housing 32 and are connected to an external power source, and a motor that is connected to the first terminal 62 and the second terminal 64 and is rotated by the power supplied via the first terminal and the second terminal from an external power source. The first terminal 62 and the second terminal 64 are protruded from the first plane with a space therebetween, and a droplet formation preventing means 70 that prevents droplets that contact both the first terminal and the second terminal from being formed is provided between the first terminal 62 and the second terminal 64 in the first plane.

Description

  The present specification relates to a fuel pump.

  In the fuel pump disposed in the fuel tank, the terminal may be eroded by water contained in the fuel or deteriorated fuel. Patent Document 1 discloses a technique for solving such a problem. In the technique of Patent Document 1, a liquid discharge port is formed in a connector portion of a fuel pump into which a power connector is inserted. When the liquid level in the fuel tank decreases and the connector part is completely exposed to the air, the fuel entering the connector part is discharged from the liquid discharge port. This is supposed to prevent electrical corrosion of the terminals.

JP-A-7-91343

  With the technique of Patent Document 1, the fuel that has entered the connector portion of the fuel pump can be discharged to some extent from the liquid discharge port, but the fuel that has entered the connector portion of the fuel pump cannot be completely discharged. That is, a small amount of fuel remains in the connector portion of the fuel pump due to the surface tension of the fuel. If fuel remains in the vicinity of the terminal of the fuel pump, there is a possibility that the terminal may be eroded by the remaining fuel.

  This specification aims at disclosing the fuel pump which can suppress the electric corrosion of the terminal of a fuel pump more.

  A fuel pump disclosed in the present specification is a fuel pump disposed in a fuel tank, and is provided with a housing and a first wiring provided on a first plane of the housing and connected to a first wiring connected to an external power source. A terminal, a second terminal provided on a first plane of the housing and connected to a second wiring connected to an external power source, and connected to the first terminal and the second terminal; A motor that rotates by electric power supplied through the second terminal is provided. The first terminal and the second terminal protrude from the first plane while being spaced apart from each other. A droplet formation preventing means is provided between the first terminal and the second terminal on the first plane to prevent the formation of droplets in contact with both the first terminal and the second terminal. .

  In this fuel pump, the droplet formation preventing means is provided on the first plane on which the first terminal and the second terminal are projected. For this reason, it is prevented that droplets that contact both the first terminal and the second terminal are formed, and current is prevented from flowing between the first terminal and the second terminal via the fuel droplet. The As a result, electrolytic corrosion of the first terminal and the second terminal can be prevented.

  The droplet formation preventing means is formed on the first terminal side with the fuel on the first plane located between the first terminal and the second terminal, and on the second terminal side. It can be separated into droplets. According to such a configuration, even if fuel remains on the first plane between the first terminal and the second terminal, they are separated into droplets on the first terminal side and droplets on the second terminal side. Is done. For this reason, it is prevented that an electric current flows between a 1st terminal and a 2nd terminal, and the electrolytic corrosion of a 1st terminal and a 2nd terminal can be prevented.

  In one embodiment of the above fuel pump, the droplet formation preventing means is a groove formed in the first plane, and one end of the groove reaches the periphery of the first plane and is opened. According to such a configuration, the fuel on the first plane between the first terminal and the second terminal can flow through the groove and be discharged to the outside from the peripheral edge of the first plane.

  In the above case, the bottom of the groove is preferably inclined toward the one end. According to such a configuration, the fuel in the groove can easily flow toward the one end.

  The width in the direction perpendicular to the longitudinal direction of the groove is shorter than the width in the direction connecting the first terminal and the groove on the first plane between the first terminal and the groove, and between the second terminal and the groove. The width is preferably shorter than the width in the direction connecting the second terminal and the groove on the first plane between them. According to such a configuration, it is possible to prevent the droplet on the first terminal side and the droplet on the second terminal side from being connected beyond the recess.

  Moreover, it is preferable that the width | variety of the direction orthogonal to the longitudinal direction of said groove | channel is longer than the depth of a groove | channel. According to such a configuration, it is possible to further prevent the droplets on the first terminal side and the droplets on the second terminal side from being connected beyond the recess.

  In another embodiment of the fuel pump described above, connectors are provided at ends of the first wiring and the second wiring, and the first and second terminals are inserted into the first and second terminals. The terminal and the first wiring may be connected and the second terminal and the second wiring may be connected. In this case, when the connector is inserted into the first terminal and the second terminal, the connector further includes a stopper that comes into contact with the bottom surface of the connector. A gap may be formed between the first plane and the first plane. According to such a configuration, an appropriate gap is formed between the bottom surface of the connector and the first plane, and fuel can be prevented from remaining between the bottom surface of the connector and the first plane.

The longitudinal cross-sectional view of the fuel pump of 1st Example. The top view of a top cover. The figure which shows the connector part formed in a top cover, and the wiring connector inserted in the connector part. FIG. 4 is a sectional view taken along line IV-IV in FIG. 2. The elements on larger scale which expand and show a part of FIG. FIG. 6 is a sectional view taken along line VI-VI in FIG. 2. The figure which shows the state by which the connector was inserted in the connector part of the top cover. FIG. 6 is a plan view of a top cover according to the second embodiment. FIG. 6 is a view showing a connector portion formed on the top cover of the second embodiment. XX sectional drawing of FIG. The elements on larger scale which expand and show a part of FIG. XII-XII sectional view taken on the line of FIG. FIG. 6 is a plan view of a top cover according to a third embodiment. The XIV-XIV sectional view taken on the line of FIG. The figure which expands and shows a part of FIG. FIG. 6 is a diagram for explaining a modification of the first embodiment. FIG. 6 is a diagram for explaining another modification of the first embodiment. XVIII-XVIII sectional view taken on the line of FIG. The figure which shows the state by which the connector was inserted in the connector part of the top cover in the other modification of Example 1. FIG. The figure which shows the experimental result which measured the leakage current.

  The fuel pump of Example 1 is demonstrated using figures. The fuel pump of the present embodiment is a fuel pump for an automobile, and is disposed in a fuel tank and used to supply fuel to an automobile engine. As shown in FIG. 1, the fuel pump 10 includes a motor unit 12 and a pump unit 14, and the motor unit 12 and the pump unit 14 are accommodated in a housing 16. The motor unit 12 has a rotor 18. The rotor 18 includes a shaft 20, a laminated iron core 22 fixed to the shaft 20, a coil (not shown) wound around the laminated iron core 22, and a commutator to which an end of the coil is connected. 24. The shaft 20 is rotatably supported by bearings 26 and 28 with respect to the housing 16. A permanent magnet 30 is fixed inside the housing 16 so as to surround the rotor 18. The top cover 32 attached to the upper portion of the housing 16 is provided with a connector portion 60 (terminals 62 and 64), which will be described in detail later, and power is supplied to the motor portion 12 via the connector portion 60. When the coil is energized through the brush 34 and the commutator 24, the rotor 18 and the shaft 20 rotate.

  A pump portion 14 is accommodated in the lower portion of the housing 16. The pump unit 14 includes a substantially disk-shaped impeller 36. On the upper surface of the impeller 36, a recess group 36a is provided along the outer peripheral edge. A recess group 36 b is provided on the lower surface of the impeller 36 along the outer peripheral edge. A through-hole that engages with the shaft 20 so as not to rotate relative to the shaft 20 is provided at the center of the impeller 36. When the shaft 20 rotates, the impeller 36 also rotates.

  The pump casing that houses the impeller 36 includes a discharge side casing 38 and a suction side casing 40. A groove 38 a is formed in the discharge-side casing 38 in a region facing the outer peripheral edge of the impeller 36. The groove 38 a is formed in a substantially C shape extending from the upstream end to the downstream end along the rotation direction of the impeller 36. A discharge port 50 is formed in the discharge side casing 38 from the downstream end of the groove 38 a to the upper surface of the discharge side casing 38. The discharge port 50 communicates the inside and outside of the pump casing (the internal space of the motor unit 12).

  A groove 40 a is formed in the suction casing 40 in a region facing the outer peripheral edge of the impeller 36. Similarly to the groove 38a, the groove 40a is also formed in a substantially C-shape extending from the upstream end to the downstream end along the rotation direction of the impeller 36. The suction side casing 40 is formed with a suction port 42 extending from the lower surface of the suction side casing 40 to the upstream end of the groove 40a. The suction port 42 communicates the inside and outside of the pump casing (outside of the fuel pump). Further, a vapor discharge port 41 is formed in the suction side casing 40. The vapor discharge port 41 discharges the vapor generated in the groove 40a to the outside of the pump. A pump flow path 44 is formed by the recess groups 36a and 36b, the groove 38a, and the groove 40a so as to cover the outer peripheral edge of the impeller 36.

  When the impeller 36 rotates in the pump casings 38 and 40, the fuel is sucked into the pump portion 14 from the suction port 42 and introduced into the pump flow path 44. The fuel whose pressure is increased while flowing through the pump flow path 44 is sent out from the discharge port 50 to the motor unit 12 side. The fuel sent to the motor unit 12 passes through the motor unit 12 and is sent to the outside from a discharge port 48 formed in the top cover 32.

  Next, the connector part 60 formed in the top cover 32 is demonstrated with reference to FIGS. As shown in FIGS. 2 to 7, the connector portion 60 has a protruding wall 66 protruding from the upper surface of the top cover 32. The connector 80 is inserted into a space formed by the protruding wall 66 and the top cover 32 (that is, a space where the upper end is opened). As shown in FIG. 3, a slit hole 76 is formed in the protruding wall 66. A convex portion 84 is formed on the connector housing 86 of the connector 80. When the connector 80 is inserted into the connector portion 60, the convex portion 84 of the connector housing 86 engages with the slit hole 76 of the protruding wall 66. This prevents the connector 80 from dropping from the connector portion 60.

  Terminals 62 and 64 are disposed on the bottom surface 68 of the connector portion 60 (the top surface of the top cover 32). The terminals 62 and 64 protrude upward from the bottom surface 68 of the connector portion 60 (see FIGS. 4 and 6). The terminals 62 and 64 are arranged with a space therebetween. The terminals 62 and 64 are surrounded by a protruding wall 66, and the upper ends of the terminals 62 and 64 are set lower than the upper edge of the protruding wall 66. As a result, the terminals 62 and 64 are protected by the protruding wall 66. The bottom surface 68 of the connector portion 60 has recesses 78b and 78a formed around the terminals 62 and 64. The recesses 78b and 78a are provided to prevent the burrs from rising on the terminals 62 and 64 when the terminals 62 and 64 and the top cover 32 are integrally formed by insert molding.

  As shown in FIGS. 3 and 7, when the connector 80 is inserted into the connector portion 60, the wirings 82 b and 82 a are connected to the terminals 62 and 64. Thus, the terminals 62 and 64 are connected to an external power source (not shown) via the wirings 82b and 82a. That is, one of the terminals 62 and 64 is connected to the positive electrode (+ electrode) of the external power supply, and the other of the terminals 62 and 64 is connected to the negative electrode (−electrode) of the external power supply. Therefore, power from the external power supply is supplied to the motor unit 12 via the terminals 62 and 64. As is clear from the above description, the top cover 32 is an example of a “housing” in the claims, and the bottom surface 68 (the upper surface of the top cover 32) corresponds to an example of a “first plane” in the claims. The terminals 62 and 64 correspond to examples of “first terminal” and “second terminal” in the claims, and the wirings 82a and 82b are “first wiring” and “second wiring” in the claims. It corresponds to an example.

  As shown in FIG. 2, grooves 70, 72 a, 72 b, 74 a, 74 b are formed on the bottom surface 68 of the connector portion 60. The grooves 74a and 74b extend in the y direction (that is, the direction from the terminal 64 toward the terminal 62). The groove 74 a extends along the inner peripheral surface of the protruding wall 66. The groove 74 b is provided between the groove 74 a and the terminals 62 and 64. Both ends of the groove 74 b reach the protruding wall 66. The grooves 72a and 72b extend along the inner peripheral surface of the protruding wall 66 extending in the x direction. One ends of the grooves 72a and 72b are connected to one ends of the grooves 74a and 74b. The groove 70 is provided at the center of the terminals 62 and 64 and extends in the x direction. One end of the groove 70 is connected to 74a and 74b. The other end of the groove 70 passes through the slit hole 76 of the protruding wall 66 and reaches the periphery of the upper surface of the top cover 32 and is opened (see FIGS. 3 and 6). The grooves 70, 72a, 72b, 74a, 74b are not connected to the recesses 78a, 78b formed around the terminals 62, 64.

  As shown in FIGS. 4 and 5, the width b of the grooves 70, 72a, 72b (the dimension in the direction perpendicular to the longitudinal direction of the grooves) is longer than the depth c of the grooves 70, 72a, 72b. This prevents droplets from being formed across the grooves 70, 72a, 72b. Although the grooves 74a and 74b are not shown in FIGS. 4 and 5, the width and depth of the grooves 74a and 74b are also the same as the width and depth of the grooves 70, 72a, and 72b.

  Further, the width b of the grooves 70, 72 a, 72 b, 74 a, 74 b is made smaller than the width a 2 of the flat portions 68 b, 68 c of the bottom surface 68 between the terminals 62 and 64. Here, the flat surface portion 68 b is located in the range from the concave portion 78 a to the groove 70, and the flat surface portion 68 c is located in the range from the concave portion 78 b to the groove 70. Further, the width b of the grooves 70, 72 a, 72 b, 74 a, 74 b is smaller than the width a 3 of the flat portion 68 a of the bottom surface 68 between the protruding wall 66 and the terminal 64 and between the protruding wall 66 and the terminal 62. It is made smaller than the width a1 of the flat portion 68d of a certain bottom surface 68. The widths a1, a2 and a3 of the flat portions 68a, 68b, 68c and 68d are 2 mm or less. As is apparent from FIG. 2, the width of the flat surface portion (the length in the x direction) of the bottom surface 68 between the grooves 74a and 74b and the bottom surface 68 between the grooves 74b and the recesses 78a and 78b. The width of the flat portion (the length in the x direction) is narrower than the width of the flat portions 68a, 68b, 68c, and 68d, and is 2 mm or less.

  In the fuel pump 10 described above, when the liquid level in the fuel tank is lowered and the connector part 60 is completely exposed to the air, the fuel entering the connector part 60 is discharged from the grooves 70, 72a, 72b, 74a, 74b. The Here, since grooves 70, 72a, 72b, 74a, 74b are formed on the bottom surface 68 of the connector portion 60, the bottom surface 68 of the connector portion 60 has an area by the grooves 70, 72a, 72b, 74a, 74b. .. Are divided into a plurality of small flat portions 68a, 68b, 68c, 68d. As a result, the droplets due to the surface tension of the fuel on the bottom surface 68 are broken, and large fuel droplets are prevented from being formed. As a result, the fuel on the bottom surface 68 flows into the grooves 70, 72a, 72b, 74a, 74b, and is discharged from one end of the groove 70 (the end portion on the slit hole 76 side) into the fuel tank. Grooves 72a, 72b, 74 are formed in the vicinity of the protruding wall 66 where the fuel tends to remain. For this reason, the fuel in the vicinity of the protruding wall 66 flows into the grooves 72 a, 72 b and 74, passes through the groove 70, and is discharged out of the connector portion 60. As a result, the fuel is discharged from the connector portion 60, so that electrolytic corrosion of the terminals 62 and 64 is prevented.

  Further, a groove 70 is formed between the terminals 62 and 64 to divide the bottom surface 68 between the terminals 62 and 64. Therefore, even if fuel remains between the terminals 62 and 64 of the connector portion 60, the fuel is prevented from becoming droplets that come into contact with both the terminals 62 and 64. That is, the groove 70 separates the droplet on the terminal 62 side and the droplet on the terminal 64 side. In particular, the width a2 of the flat portions 68b and 68c between the terminals 62 and 64 is 2 mm or less, the width b of the groove 70 is smaller than the width a2 of the flat portions 68b and 68c, and the width b of the groove 70 is It is larger than the depth c. By these, it is suitably prevented that droplets are formed across the groove 70. For this reason, it is possible to prevent current from flowing between the terminals 62 and 64 via the fuel droplets, and to prevent electrolytic corrosion of the terminals 62 and 64.

  Here, an experimental example in which the current flowing between the terminals is measured using the fuel pump according to Example 1 and the conventional fuel pump (comparative example) will be described. In the experiment, a predetermined amount of fuel was dropped on the connector portion while a voltage was applied between the terminals of the fuel pump, and the current flowing between the terminals was measured. As shown in FIG. 20, in the fuel pump of Example 1, the fuel dripped onto the connector portion was quickly discharged from the connector portion, and the current flowing between the terminals decreased in a short time. On the other hand, in the fuel pump of the comparative example, the fuel dropped on the connector portion was not discharged from the connector portion, and current flowed between the terminals for a long period. From this, it was confirmed that in the fuel pump of Example 1, fuel was quickly discharged from the connector portion, and electrolytic corrosion of the terminals could be prevented.

  A fuel pump of Example 2 will be described with reference to the drawings. The fuel pump of the second embodiment is obtained by changing a part of the fuel pump of the first embodiment. Therefore, here, differences from the fuel pump of the first embodiment will be described. In addition, about the same member as the fuel pump of Example 1, the same code | symbol is used and the detailed description is abbreviate | omitted.

  As shown in FIGS. 8 to 12, in the fuel pump of the second embodiment, the shapes of the grooves 100 a, 100 b, 102 a, 102 b formed on the bottom surface 68 of the connector portion 60 are different from those of the first embodiment. That is, on the bottom surface 68, grooves 100a and 100b extending in the x direction and five grooves 102a and 102b extending in the y direction are formed. The grooves 100 a and 100 b extend along the protruding wall 90. The grooves 100a and 100b pass through the fuel discharge ports 94a and 94b formed in the protruding wall 90, respectively, and one end of the grooves 100a reaches the periphery of the upper surface of the top cover and is opened (see FIGS. 9 and 12).

  The five grooves 102a and 102b are arranged at substantially equal intervals in the x direction. Each groove 102a has one end connected to the groove 100a and extends from the groove 100a in the y direction (specifically, the negative direction of the y axis). Of the five grooves 102 a, one groove 102 a disposed at one end (minus side end) in the x direction extends along the protruding wall 90. Of the five grooves 102a, the three grooves 102a arranged at the other end in the x direction (the end on the plus side) have a base end portion formed between the groove 100a and the recess 78b, and a tip portion thereof. It is formed between the recess 78b and the recess 78a. These grooves 102a are connected at their base end portions and distal end portions via recesses 78b. On the other hand, one end of the groove 102b is connected to the groove 100b, and extends from the groove 100b in the y direction (specifically, the positive direction of the y axis). Of the five grooves 102 b, the groove 102 a disposed at one end in the x direction extends along the protruding wall 90. Of the five grooves 102b, the three grooves 102b arranged at the other end in the x direction have a base end portion formed between the groove 100b and the concave portion 78a, and a tip portion between the concave portion 78a and the concave portion 78b. Is formed. These grooves 102b have a base end portion and a tip end portion connected via a recess 78a.

  As shown in FIG. 11, the width a4 (interval in the y direction) of the flat portion 168 between the grooves 102a and 102b is 2 mm or less, and from the width b of the grooves 100a, 100b, 102a, and 102b. Has also been enlarged. As in the first embodiment, the grooves 100a, 100b, 102a, and 102b have the same dimensions (that is, width b and depth c), and the width b of the grooves 100a, 100b, 102a, and 102b. (Dimension in a direction perpendicular to the longitudinal direction of the groove) is longer than the depth c of the grooves 70, 72a, 72b.

  Note that an engagement hole 92 having a smaller opening area than the slit hole 76 of the first embodiment is formed in the protruding wall 90 (see FIG. 9). When the connector 80 is inserted into the connector portion 60, the convex portion 84 of the connector housing 86 engages with the engagement hole 92 of the protruding wall 90. This prevents the connector 80 from dropping from the connector portion 60.

  Also in the fuel pump of the second embodiment, when the liquid level of the fuel tank is lowered and the connector part 60 is completely exposed to the air, the fuel entering the connector part 60 is discharged from the grooves 100a, 100b, 102a, 102b. . Since the bottom surface 68 of the connector portion 60 is divided by the grooves 100a, 100b, 102a, and 102b, large fuel droplets are prevented from being formed on the bottom surface 68. As a result, the fuel on the bottom surface 68 passes through the grooves 100a, 100b, 102a, 102b, and is suitably discharged into the fuel tank from one end of the grooves 100a, 100b (the end on the fuel discharge ports 94a, 94b side). . Further, since the grooves 100a, 100b, 102a, and 102b are formed along the protruding wall 90, fuel is prevented from remaining in the vicinity of the protruding wall 90. As a result, the fuel is suitably discharged from the connector portion 60, and electrolytic corrosion of the terminals 62 and 64 is prevented.

  Further, a part of the grooves 102 a and 102 b is formed between the terminals 62 and 64. Specifically, a part of the grooves 102 a and 102 b is formed between a recess 78 b formed around the terminal 62 and a recess 78 a formed around the terminal 64. As a result, even if fuel remains between the terminals 62 and 64, the fuel is prevented from becoming droplets that come into contact with both the terminals 62 and 64. For this reason, it is possible to prevent current from flowing between the terminals 62 and 64 via the fuel droplets, and to prevent electrolytic corrosion of the terminals 62 and 64.

  A fuel pump of Example 3 will be described with reference to the drawings. The fuel pump of the third embodiment is obtained by changing a part of the fuel pump of the second embodiment. Therefore, here, differences from the fuel pump of the second embodiment will be described. In addition, about the same member as the fuel pump of Example 2, the same code | symbol is used and the detailed description is abbreviate | omitted.

  As shown in FIGS. 13 to 16, in the fuel pump of the third embodiment, the shapes of the grooves 110 a, 110 b, 112, 114 a, 114 b, 116 formed on the bottom surface 68 of the connector portion 60 are different from those of the second embodiment. That is, on the bottom surface 68, grooves 110a, 110b, 112 extending along the protruding wall 90, grooves 114a, 114b formed in the corner portion of the protruding wall 90, and two terminals formed between the terminals 62, 64 are formed. The groove 116 is formed. One end of each of the grooves 110a and 110b passes through a fuel discharge port (not shown) formed in the projecting wall 90, and the one end reaches the peripheral edge of the upper surface of the top cover and is opened.

  The groove 112 connects the other end of the groove 110a and the other end of the groove 110b. A groove 114a is formed in the vicinity of the connection portion between the groove 112 and the groove 110a, and the groove 112 and the groove 110a are further connected via the groove 114a. Further, a groove 114b is formed in the vicinity of the connection portion between the groove 112 and the groove 110b, and the groove 112 and the groove 110b are further connected via the groove 114b.

  As shown in FIG. 13, the two grooves 116 are formed so as to intersect in the vicinity of the center of the terminals 62 and 64. As shown in FIGS. 14 and 15, the width a5 of the flat portion 178a between the concave portion 78a and the groove 116 (and the width of the flat portion 178b of the concave portion 78b and the groove 116) is 2 mm or less, and the grooves 110a and 110b. 112, 114a, 114b, 116 is made larger than the width b. Note that two grooves 116 intersect each other in the cross section along the line XIV-XIV in FIG. For this reason, the width d of the groove 116 in the y direction is larger than the width b of the groove 116, but is smaller than the width a5 of the planar portions 178a and 178b.

  Also in the fuel pump of the third embodiment, the bottom surface 68 of the connector portion 60 is divided by the grooves 110a, 110b, 112, 114a, 114b, 116 as in the first and second embodiments. Therefore, the fuel on the bottom surface 68 is suitably discharged into the fuel tank through the grooves 110a, 110b, 112, 114a, 114b, and 116. In addition, grooves 110 a, 110 b, and 112 are formed along the protruding wall 90, and grooves 114 a and 114 b are formed in the corner portion of the protruding wall 90. This prevents fuel from remaining in the vicinity of the protruding wall 90. As a result, the fuel is suitably discharged from the connector portion 60, and electrolytic corrosion of the terminals 62 and 64 is prevented.

  Further, a groove 116 is formed between the terminals 62 and 64, and the formation of fuel droplets contacting both the terminals 62 and 64 is prevented. For this reason, it is possible to prevent current from flowing between the terminals 62 and 64 via the fuel droplets, and to prevent electrolytic corrosion of the terminals 62 and 64.

  Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.

  For example, the groove formed in the bottom surface 68 of the connector part 60 may be inclined toward the discharge end. For example, as shown in FIG. 16, the groove 120 may be formed to be inclined toward the discharge end. According to such a configuration, the fuel that has flowed into the groove 120 can be suitably discharged into the fuel tank. In addition, the structure which inclines a groove | channel toward a discharge end is applicable to each Example mentioned above.

  Furthermore, a gap may be formed between the bottom surface 68 of the connector portion 60 and the connector 80 (connector housing 86) when the connector 80 is inserted into the connector portion 60. For example, as shown in FIGS. 17 to 19, stoppers 122 a, 122 b, 122 c, and 122 d are formed on the bottom surface 68 of the protruding wall 66 at the four corner portions of the protruding wall 66. In such a configuration, when the connector 80 is inserted into the connector portion 60, the connector housing 86 and the stoppers 122 a, 122 b, 122 c, 122 d abut, and a gap is formed between the bottom surface 68 of the connector portion 60 and the connector housing 86. The For this reason, it can suppress more that a fuel remains between the connector part 60 and the connector housing 86. FIG. In addition, it is preferable that the clearance gap formed between the bottom face 68 of the connector part 60 and the connector housing 86 shall be 0.3 mm or more. By setting the gap to be 0.3 mm or more, it is possible to suitably suppress the fuel from remaining between the two. In addition, the structure which forms a stopper in the bottom face of a connector part is applicable to each Example mentioned above.

  In each of the embodiments described above, the recesses 78b and 78a are formed around the terminals 62 and 64. However, the present invention is not limited to such a form. For example, when the terminals 62 and 64 and the top cover 32 are not integrally formed by insert molding and the terminals 62 and 64 are press-fitted and held in the top cover 32, recesses are formed around the terminals 62 and 64. There is no need.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. Moreover, the technique illustrated in this specification or the drawings achieves a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

12: motor part 14: pump part 16: housing 18: rotor 20: shaft 22: laminated iron core 24: commutator 26, 28: bearing 30: permanent magnet 32: top cover 34: brush 36: impeller 36a, 36b : Recess 38: discharge casing, 38a: groove 40: suction side casing, 40a: groove 42: suction port 44: pump flow path 48: discharge port 50: discharge port 60: connector portion 62, 64: terminal 66: protrusion Wall 68: bottom surface 70, 72a, 72, 74a, 74b: groove 76: slit hole 78a, 78b: recess 80: connector 82a, 82b: wiring 86: connector housing

Claims (7)

A fuel pump disposed in the fuel tank,
A housing;
A first terminal provided on a first plane of the housing and connected to a first wiring connected to an external power source;
A second terminal provided on a first plane of the housing and connected to a second wiring connected to an external power source;
A motor connected to the first terminal and the second terminal, and rotated by the electric power supplied from the external power source through the first terminal and the second terminal,
The first terminal and the second terminal protrude from the first plane in a state of being spaced apart from each other,
Between the first terminal and the second terminal on the first plane, there is provided a droplet formation preventing means for preventing droplets contacting both the first terminal and the second terminal from being formed. pump.   The droplet formation preventing means includes a fuel on a first plane located between the first terminal and the second terminal, a droplet formed on the first terminal side, a droplet formed on the second terminal side, The fuel pump according to claim 1, which is separated into two parts.   3. The fuel pump according to claim 1, wherein the droplet formation preventing means is a groove formed in the first plane, and one end of the groove reaches the periphery of the first plane and is open.   The fuel pump according to claim 3, wherein a bottom of the groove is inclined toward the one end.   The width in the direction perpendicular to the longitudinal direction of the groove is shorter than the width in the direction connecting the first terminal and the groove on the first plane between the first terminal and the groove, and between the second terminal and the groove. The fuel pump according to claim 3 or 4, wherein the fuel pump is shorter than a width in a direction connecting the second terminal and a groove on a first plane.   The fuel pump according to any one of claims 3 to 5, wherein a width in a direction orthogonal to a longitudinal direction of the groove is longer than a depth of the groove. Connectors are provided at end portions of the first wiring and the second wiring, and the first terminal and the first wiring are connected to each other by inserting the connector into the first terminal and the second terminal, and the second terminal. And the second wiring is connected,
A stopper that contacts the bottom surface of the connector when the connector is inserted into the first terminal and the second terminal;
The fuel pump according to any one of claims 1 to 6, wherein a gap is formed between the bottom surface of the connector and the first plane when the bottom surface of the connector comes into contact with the stopper.

Images