JP2018112138A - Fuel tank lid unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank lid unit including a storage part, where a technique is disclosed for suppressing temperature rise in the storage part while securing a clearance between a tank lid part and the storage part.SOLUTION: A fuel tank lid unit includes the tank lid part, the storage part, and a support part, the tank lid part closing an opening in the upper part of a fuel tank, the storage part being provided on the tank lid part and having an internal space storing an electronic circuit, the support part being provided between the tank lid part and the bottom of the storage part and forming a clearance between the tank lid part and the storage part. On the wall face of the storage part of the fuel tank lid unit, a protrusion is provided protruding to the outside of the storage part. The protrusion is provided at least on the bottom of the storage part. The clearance between the tank lid part and the storage part is communicated with a space outside the tank lid unit.SELECTED DRAWING: Figure 3

Description

  The present specification relates to a fuel tank lid unit used as a fuel tank lid.

  Patent Document 1 discloses a fuel tank lid unit in which a housing portion that houses an electronic circuit that drives a pump in a fuel tank is attached to a lid portion (tank lid portion) of the fuel tank. In patent document 1, the clearance gap (ventilation space) is provided between the tank cover part and the accommodating part. In Patent Document 1, by providing a gap between the tank lid portion and the accommodating portion, the vaporized fuel that has permeated through the tank lid portion is discharged into the external space without entering the accommodating portion.

Japanese Patent Laid-Open No. 2016-23592

  If a gap is provided between the tank lid portion and the accommodating portion, the height of the fuel tank lid unit is increased by the gap. On the other hand, if a gap is provided between the tank lid portion and the housing portion without changing the height of the fuel tank lid unit, the space in the housing portion becomes narrow, and the atmospheric temperature in the housing portion becomes high due to the heat generated in the electronic circuit. Become. If the ambient temperature around the electronic circuit becomes high, there is a concern that the operation of the electronic circuit may be adversely affected. The present specification discloses a technique for suppressing a temperature rise in the housing portion while securing a gap between the tank lid portion and the housing portion in a tank lid unit including the housing portion.

  The fuel tank lid unit disclosed in this specification includes a tank lid portion, a storage portion, and a support portion. The tank lid closes the opening at the top of the fuel tank. The accommodating portion is provided on the tank lid portion, and an electronic circuit is accommodated in the internal space. The support portion is provided between the tank lid portion and the bottom portion of the storage portion, and forms a gap between the tank lid portion and the storage portion. In this fuel tank lid unit, a protruding portion that protrudes toward the outside of the accommodating portion is provided on the wall surface of the accommodating portion. In addition, the protrusion part is provided in the bottom part of the accommodating part at least. Further, the gap between the tank lid portion and the accommodating portion communicates with a space outside the fuel tank lid unit.

  In the fuel tank lid unit, a protruding portion that protrudes outward is provided on the wall surface of the housing portion. By providing the protrusion, the surface area of the wall surface (outer wall surface) increases, and the contact area between the wall surface and the outside air increases. It becomes easy for the heat | fever in a accommodating part to be discharge | released from a wall surface to external air, and it can suppress that the inside of a accommodating part becomes high temperature. In the fuel tank lid unit, a protrusion is provided at least on the bottom of the housing. The protrusion provided at the bottom protrudes toward the tank lid. That is, the protruding portion protrudes into the gap between the accommodating portion and the tank lid portion. Even if the projecting portion is provided at the bottom, the height of the accommodating portion (fuel tank lid unit) does not increase. The protrusion provided at the bottom increases the contact area between the wall surface of the housing and the outside air without increasing the height of the fuel tank lid unit.

Sectional drawing of the basic structure of a fuel tank cover unit is shown. The top view of the basic structure of a fuel tank cover unit is shown. Sectional drawing of the fuel tank cover unit of 1st Example is shown. Sectional drawing of the fuel tank cover unit of 2nd Example is shown. Sectional drawing of the fuel tank cover unit of 3rd Example is shown. Sectional drawing of the fuel tank cover unit of 4th Example is shown. Sectional drawing of the fuel tank cover unit of 5th Example is shown. Sectional drawing of a protrusion part is shown. Sectional drawing of a protrusion part is shown. Sectional drawing of a protrusion part is shown. Sectional drawing of a protrusion part is shown. Sectional drawing of the fuel tank cover unit of 6th Example is shown. Sectional drawing of the fuel tank cover unit of 7th Example is shown. Sectional drawing of the fuel tank cover unit of 8th Example is shown. Sectional drawing of the fuel tank cover unit of 9th Example is shown. Sectional drawing of the fuel tank cover unit of 10th Example is shown. Sectional drawing of the conventional fuel tank cover unit is shown.

  The main features of the fuel tank lid unit disclosed in this specification are listed below. Note that the technical elements described below are independent technical elements, and exhibit technical usefulness alone or in various combinations. In this specification, expressions such as “upper”, “upper” and “upper” mean the upper side in the direction of gravity, and expressions such as “lower”, “lower” and “lower” refer to the lower side of the direction of gravity. means.

  The fuel tank lid unit may be disposed at the upper part of the fuel tank and may close the opening at the upper part of the fuel tank. The fuel tank lid unit may include a tank lid portion that closes the opening of the upper portion of the fuel tank, and a storage portion that is provided on the tank lid portion. The accommodating part may be supported by the tank lid part by the support part. A gap may be provided between the tank lid portion and the accommodating portion. The gap may communicate with a space outside the fuel tank lid unit (external space). That is, the support part is provided between the tank cover part and the bottom part of the storage part, and a gap communicating with the external space may be formed between the tank cover part and the storage part. The support portion may be integral with the tank lid portion. Further, the support part may be integrated with the bottom part of the accommodating part. Alternatively, the tank lid portion, the support portion, and the bottom portion of the storage portion may be integrated. The term “integrated” as used in this specification means an inseparable integrated product that is integrally molded by extrusion molding or the like.

  The accommodating part may be provided with an internal space for accommodating the electronic circuit. The housing portion may include a side portion that surrounds the internal space and extends in the vertical direction, a bottom portion that is provided below the side portion, and an upper lid portion that is provided above the side portion. The side and bottom may be integral. Further, the side part and the upper cover part may be separable separate bodies. In addition, the above-mentioned support part may support the edge part (part from which a side part is extended in an up-down direction) of the bottom part, and is supporting parts (parts away from the side part) other than the edge part of a bottom part. May be. When a support part supports the edge part of a bottom part, the support part may be continuously extended from the side part of the accommodating part. That is, when the accommodating part is viewed in plan, the support part and the side part of the accommodating part may overlap.

  The tank lid part and the accommodating part may be made of resin. Moreover, the tank lid part and the side part and bottom part of the accommodating part may be formed of the same resin material. The upper lid of the housing part may be the same resin material as the other parts (side part, bottom part) of the housing part, or may be a different resin material. The upper lid may be made of a material other than resin, for example, metal.

  A protruding portion that protrudes toward the outside of the accommodating portion may be provided on the wall surface of the accommodating portion. Examples of the wall surface of the housing part include the upper lid, the side part, and the bottom part. The protruding portion may be formed by protruding the wall surface of the housing portion toward the outside, or may be formed by attaching a member (protruding member) different from the housing portion to the wall surface of the housing portion. In any form, since the surface area of the wall surface (surface area of the outer wall) increases, the contact area between the wall surface and the outside air increases, and the heat in the housing portion is easily released to the outside air. That is, the heat radiation property (coolability in the housing portion) of the housing portion is improved. When the protruding member is attached to the wall surface of the housing portion, the material of the protruding member may be the same as the material of the wall surface or may be different from the material of the wall surface. For example, when the material of the wall surface is a resin, the heat dissipation can be improved by attaching a metal protruding member to the wall surface than attaching the protruding member of the same material (made of resin) to the wall surface.

  The protruding portion may be provided at least at the bottom of the accommodating portion. Providing a protruding part at the bottom of the housing part can increase the surface area of the wall surface (bottom part) of the housing part without changing the height of the housing part (fuel tank lid unit) (heat dissipation of the housing part). Can be improved). One protrusion part may be provided in the bottom part of the accommodating part, and multiple may be provided. Moreover, in addition to the bottom part of the accommodating part, the protrusion part may be provided in the upper part of the accommodating part and / or the side part of the accommodating part. Furthermore, the heat dissipation of the accommodating part can be improved. The number of protrusions provided on the upper part and the side part of the housing part may be one or plural.

  The protruding portion provided at the bottom of the housing portion may be in contact with the tank lid portion. Since the accommodating portion is supported by the tank lid portion by the protruding portion, the rigidity of the accommodating portion is improved.

  A depression may be formed on the inner space side of the protrusion. That is, the outer surface of the wall surface of the housing portion may protrude outward, and the inner surface of the wall surface of the housing portion may also protrude outward. By providing the recess in the housing part, the area of the wall surface (inner surface) that defines the internal space of the housing part increases. The contact area between the internal space of the housing part and the wall surface is increased, and heat in the housing part is easily transferred to the wall surface. In addition, when the some protrusion part is provided in the wall surface of the accommodating part, the dent may be formed in the internal space side of all the protrusion parts, or a dent is only in the internal space side of some protrusion parts. It may be formed. That is, it is only necessary that a recess is formed on the inner space side of at least one protrusion.

  The cross-sectional shape of the protruding portion of the portion where the depression is formed may be a shape in which one side of a square (square, rectangle, trapezoid) is deleted, or a shape in which one side of a triangle is deleted, It may be arcuate. Further, the inner surface of the recess may be inclined from the opening of the recess toward the bottom of the recess with respect to the non-recessed surface where the recess is not formed. Here, “inclination” means that the angle formed by the first extension line extending the non-recessed surface and the second extension line extending the inner surface of the recess is less than 90 degrees. That is, when the recess is viewed in plan (observed from a direction orthogonal to the opening of the recess), the entire inner surface of the recess (the inner surface of the protrusion that defines the recess) may be observed. The wall surface of the housing portion can receive radiant heat uniformly, and the temperature of the wall surface can be prevented from excessively rising. That is, there is no surface that is difficult to receive radiant heat, and heat is received by the entire wall surface of the housing portion, and as a result, an increase in the temperature of the wall surface can be suppressed. In particular, an effect of suppressing the softening of the resin or the like can be obtained in the resin housing portion.

  The entire wall surface of the housing portion may protrude outward and a recess may be formed in the housing portion. That is, the wall surface of the housing portion may be curved from the end portion of the wall surface toward the center portion. Also in this case, the area of the wall surface (outer surface area) is increased, and the heat dissipation of the housing portion can be improved. That is, the entire wall surface of the housing portion may protrude outward, and the housing portion may have a protruding portion, or a part of the wall surface of the housing portion may protrude outward.

  The electronic circuit accommodated in the accommodating portion may include a substrate and a plurality of electronic components arranged on the substrate. Further, at least a part of the electronic component may be located in the recess. Note that the electronic circuit may include at least a capacitor. In that case, at least a part of the capacitor may be located in the recess. Typically, a capacitor has the largest size among electronic components mounted on an electronic circuit. Therefore, the height of the accommodating portion is suppressed by positioning the capacitor in the recess. That is, a recess may be provided at the bottom of the housing portion so that a part of the capacitor mounted on the electronic circuit is present in the recess.

  In addition, when the whole bottom part of an accommodating part protrudes toward the exterior, the electronic component accommodated in an accommodating part may be a thing in which the capacitor is mounted in the center of an electronic circuit. Since the capacitor can be disposed at a portion where the height of the internal space is high, it is possible to suppress the height of the housing portion from being increased.

  An internal terminal and an external terminal may be connected to the electronic circuit. The internal terminal may pass from the inside of the housing portion to the inside of the fuel tank through the bottom portion of the housing portion and the tank lid portion. The internal terminal may pass through a support portion that supports the housing portion. In this case, the internal terminal extends from the accommodating portion into the fuel tank without being exposed to the outside of the fuel tank lid unit. The internal terminal may connect an electronic circuit in the housing unit and an electronic device in the fuel tank. The external terminal may extend from the internal space of the housing part to an external terminal that passes through the bottom part and / or the side part and is disposed outside the housing part. The external terminal may connect the electronic circuit and the external terminal.

  With reference to FIG.1 and FIG.2, the basic structure of the fuel tank cover unit 1 is demonstrated. As shown in FIG. 1, the fuel tank lid unit 1 constitutes a part of the fuel supply device 100. The fuel supply device 100 includes a fuel tank 50 and a fuel tank lid unit 1. A fuel pump (not shown) for sending fuel to the internal combustion engine is disposed in the fuel tank 50. The fuel tank lid unit 1 includes a tank lid portion 2, a storage portion 6, and a support portion 5. The tank lid 2 closes an opening provided in the upper part of the fuel tank 50. The accommodating portion 6 is arranged on a part of the tank lid portion 2 by the support portion 5. An electronic circuit 8 that controls the fuel pump is disposed in the housing 6.

  An internal terminal 10 and an external terminal 12 are connected to the electronic circuit 8. The internal terminal 10 connects the fuel pump and the electronic circuit 8. The internal terminal 10 passes through the tank lid portion 2 and extends from the accommodating portion 6 into the fuel tank 50. The external terminal 12 connects an external terminal (not shown) and the electronic circuit 8. The external terminal 12 passes through the wall of the accommodating portion 6 and extends to the connector 4 to which the external terminal is connected. As shown in FIG. 2, the tank cover 2 is a circular plate, and a discharge port 60 for discharging the fuel sent from the fuel tank 50 is also provided on the tank cover 2.

  Hereinafter, specific examples (accommodating portions 6a to 6j) of the accommodating portion 6 will be described. In the following description, illustration of the internal terminal 10, the external terminal 12, and the connector 4 is omitted.

(First embodiment)
The accommodating part 6a is demonstrated with reference to FIG. The accommodating portion 6 includes a bottom portion 18, a side portion 14, and an upper lid 16. The accommodating portion 6 is supported on the tank lid portion 2 by the support portion 5. As a result, a gap 70 is provided between the tank lid portion 2 and the accommodating portion 6. In addition, the tank cover part 2, the support part 5, and the accommodating part 6 (the bottom part 18 and the side part 14) are integrated, and are one part. The tank lid part 2, the support part 5, and the accommodating part 6 (the bottom part 18 and the side part 14) are made of resin. The upper lid 16 is made of metal and is fixed to the side portion 14. In addition, the support part 5 can also be regarded as the extension part by which the edge part of the side part 14 or the bottom part 18 extended to the tank cover part 2 side.

  A protruding portion 20 that protrudes toward the tank lid portion 2 is provided on the bottom portion 18. A plurality of protrusions 20 are provided on the bottom 18 at substantially equal intervals. The thickness of the bottom portion 18 in the protruding portion 20 is equal to the thickness of the bottom portion 18 where the protruding portion 20 is not provided. Therefore, a recess 22 is formed in the accommodating portion 6a corresponding to a portion where the protruding portion 20 is provided. That is, a recess 22 is formed on the inner space side of the protrusion 20.

  An electronic circuit 8 is disposed in the housing 6a. The electronic circuit 8 is fixed to a support column 13 extending from the bottom portion 18 and is disposed above the housing portion 6a. The column 13 is fixed on the bottom 18 of the portion where the protrusion 20 is not provided. That is, the column 13 does not exist in the recess 22. The electronic circuit 8 includes a plurality of electronic components 7. An internal terminal (see FIG. 1) connected to the electronic circuit 8 passes through the side portion 14, the support portion 5, and the tank lid portion 2, and extends into the fuel tank 50 from the accommodating portion 6 a. .

  Advantages of the fuel tank lid unit 1 including the accommodating portion 6a will be described. As described above, the electronic circuit 8 is disposed in the accommodating portion 6a. The electronic circuit 8 generates heat when driven. As a result, the temperature in the accommodating part 6a rises. If the temperature in the accommodating part 6a rises, the operation of the electronic circuit 8 may be adversely affected. The accommodating part 6 a is provided with a protruding part 20 on the bottom part 18. For this reason, the contact area between the bottom 18 (the outer surface of the bottom 18) and the gap 70 (external space) is increased as compared with the conventional housing 106 in which no protrusion is provided on the bottom 18 shown in FIG. Therefore, the housing 6a is more likely to release the heat in the housing 6a to the outside as compared to the housing 106. By improving the heat dissipation, the temperature rise in the housing portion 6a is suppressed, and it is possible to prevent adverse effects on the operation of the electronic circuit 8.

  Moreover, in the accommodating part 6a, the hollow 22 is provided in the position in which the protrusion part 20 is provided. Therefore, the contact area between the internal space of the storage portion 6a and the bottom portion 18 (the inner surface of the bottom portion 18) of the storage portion 6a increases as compared with the storage portion 106 (see FIG. 17). Compared with the accommodating part 106, the accommodating part 6a is easy to transfer the heat in the accommodating part to the bottom part 18, and the heat dissipation is further improved.

  Another advantage of the fuel tank lid unit 1 including the accommodating portion 6a will be described. The fuel tank lid unit 1 is made of resin, and is molded by filling a mold with resin. In the fuel tank lid unit 1, a mold part having the shape of the gap 70 is used to form the gap 70. By providing the protrusion 20 on the bottom 18, a thick part and a thin part can be provided in the mold part for forming the gap 70. By providing the thick part in the mold part, the rigidity of the mold part can be increased and the life of the mold can be extended. Moreover, since the rigidity of the mold parts is increased, the gap 70 between the tank lid portion 2 and the accommodating portion 6a can be formed with high accuracy. In the case of the accommodating portion 106, the mold part for forming the gap 70 is a flat plate.

  Hereinafter, the accommodating parts 6b-6j are demonstrated. The accommodating parts 6b-6j are modifications of the accommodating part 6a. In the accommodating parts 6b-6j, about the feature which is common in the accommodating part 6a, description may be abbreviate | omitted by attaching | subjecting the accommodating part 6a with the same reference number.

(Second embodiment)
The accommodating part 6b is demonstrated with reference to FIG. The accommodating part 6b is provided with a protruding part 20 on the outer surface of the bottom part 18 (surface on the tank lid part 2 side). The protrusion 20 and the bottom 18 are integrated. That is, the material of the protrusion 20 and the bottom 18 is the same. In the accommodating part 6b, the hollow is not formed in the bottom part 18 (refer FIG. 3 for comparison). Therefore, in the accommodating part 6b, it can be grasped | ascertained that the thickness of the bottom part 18 is thick in the part in which the protrusion part 20 is provided. The housing 6b also has a larger contact area between the outer surface of the bottom 18 and the external space (gap 70) than the housing 106 (see FIG. 17). Moreover, since the thickness of the bottom part 18 is partially thick, the accommodating part 6b can make the rigidity of the bottom part 18 high.

  The protruding portion 20 may be a separate component from the bottom portion 18. That is, a protruding member (projecting portion 20) that is a separate component from the bottom portion 18 may be attached to the bottom portion 18. In this case, the protrusion 20 can use a material different from that of the bottom 18. For example, the heat dissipation can be further improved by using the metal protrusion 20.

(Third embodiment)
The accommodating part 6c is demonstrated with reference to FIG. In the accommodating part 6c, the protrusion part 30 and the hollow 32 are provided also in the upper cover 16c. The shape of the protrusion 30 and the recess 32 is substantially equal to the protrusion 20 and the recess 22 provided on the bottom 18. By providing projecting portions (projecting portions 20 and 30) on both the upper lid 16c and the bottom portion 18, the contact area between the outer surface and the external space on the upper and lower sides of the accommodating portion 6c increases, and the heat dissipation can be further improved. . Further, by providing depressions (depressions 22 and 32) in both the upper lid 16c and the bottom portion 18, the contact area between the inner surface of the accommodating portion 6c and the internal space of the accommodating portion 6c is further increased, and the wall surfaces (the upper lid 16c and the bottom portion are increased). The heat transfer to 18) is further improved.

  The upper lid 16c is a separate member from the other wall surfaces (side portion 14 and bottom portion 18) of the accommodating portion 6c. The accommodating part 6c is equivalent to the accommodating part 6a (see FIG. 3) using the upper lid 16c instead of the upper lid 16. Also in the accommodating part 6b (refer FIG. 4), it can replace with the upper cover 16 and can use the upper cover 16c.

(Fourth embodiment)
The accommodating part 6d is demonstrated with reference to FIG. The accommodating part 6d is a modification of the accommodating part 6c. In the accommodating part 6d, the protruding part 40 is also provided on the side part 14d. The housing portion 6d can increase the contact area with the external space more than the housing portion 6c, and can further improve heat dissipation. Note that the feature of providing the protruding portion on the side wall can also be applied to the accommodating portions 6a and 6b.

(5th Example)
The accommodating part 6e is demonstrated with reference to FIG. In the accommodating part 6e, the bottom part 18 inclines toward the front-end | tip (end part by the side of the tank cover part 2) of the protrusion part 20 from the starting point of the protrusion part 20 in the part in which the protrusion part 20 is formed. In other words, the inner surface of the recess 22 is inclined from the opening of the recess 22 toward the bottom of the recess 22 with respect to the non-recessed surface where the recess 22 is not formed (the surface of the bottom 18 where the support column 13 is provided). doing. Since the accommodating part 6e is provided with the inclined protrusion part 20, the heat from the electronic circuit 8 is easily transmitted to the entire bottom part 18. Since the accommodating part 6e can receive heat in the whole wall surface, it can suppress that a wall surface temperature rises excessively compared with the form in which the part which is hard to receive heat is provided in the wall surface.

  With reference to FIG.8 and FIG.9, the advantage provided with the protrusion part 20 which inclined is demonstrated in detail. The protrusion 20a in FIG. 8 has a shape in which the inner surface of the recess 22 has one side of the rectangle removed, and corresponds to the protrusion 20 formed in the housing portions 6a and 6c. In the protruding portion 20 a, the inner surface of the recess 22 is composed of a wall surface 52 and a bottom surface (bottom portion) 54. The wall surface 52 is perpendicular to the non-recessed surface 56 where the recess 22 is not formed. That is, the angle formed by the wall surface 52 and the non-recessed surface 56 is 90 degrees, and the wall surface 52 is not inclined from the opening of the recess 22 toward the bottom of the recess 22. Therefore, in the protrusion 20a, the wall surface 52 is not observed when the recess 22 is viewed in plan (observed in the direction of the arrow 55).

  The protruding portion 20b in FIG. 9 has a shape in which one side of the triangle is deleted from the inner surface of the recess, and corresponds to the protruding portion 20 formed in the accommodating portion 6e. In the protruding portion 20 e, the inner surface of the recess 22 is composed of wall surfaces 52 and 52. The intersection 54 of the wall surfaces 52, 52 is the bottom of the recess 22. The wall surface 52 is inclined from the opening of the depression 22 toward the bottom of the depression 22 (intersection 54). That is, the angle formed by the wall surface 52 and the non-recessed surface 56 is less than 90 degrees. Therefore, in the protrusion 20b, the entire inner surface (wall surface 52) of the recess 22 is observed when the recess 22 is viewed in plan (observed in the direction of the arrow 55).

  As described above, when the protruding portion 20b is observed in the direction of the arrow 55 (the recess 22 is viewed in plan), the entire inner surface (wall surface 52) of the recess 22 is observed. Therefore, radiant heat from the electronic component 7 reaches the entire inner surface of the recess 22. The protrusion 20b can receive the radiant heat of the electronic component 7 over the entire inner surface of the recess 22 (see also FIG. 7). On the other hand, in the case of the protruding portion 20a (see FIG. 8), the wall surface 52 is not observed when the recess 22 is viewed in plan, so that the radiant heat generated in the electronic component 7 does not easily reach the wall surface 52. The protrusion 20 a has a surface (wall surface 52) in the recess 22 that is difficult to absorb the radiant heat of the electronic component 7. The protrusion part 20b can enlarge the heat receiving area of a radiant heat compared with the protrusion part 20a.

  10 and the protruding portion 20d shown in FIG. 11 also have the wall surface 52 of the depression 22 with respect to the non-depression surface 56 when the depression 22 is viewed in a plan view (observed in the direction of the arrow 55). Inclined and extended from the opening of the recess 22 toward the bottom 54 of the recess 22. The protrusions 20 c and 20 d can also receive radiant heat over the entire inner surface of the recess 22.

The forms described in the first to fifth embodiments are summarized as above.
Form A: Projections are provided only at the bottom of the housing (housing 6a, 6b, 6e)
Form B: Projections are provided on the bottom and top lid of the housing (housing 6c)
Form C: Form in which protrusions are provided on the bottom, top lid, and side of the housing (housing 6d)
Protrusion form 1: A depression is formed on the inner space side of the protrusion (accommodating portions 6a, 6c, 6d, 6e).
Projection form 2: No depression is formed on the inner space side of the accommodating part (accommodating part 6b, side part 14d of accommodating part 6b).

  Further, with respect to the projecting form 1, the projecting form 1a: projecting part 20a (FIG. 8), projecting form 1b: projecting part 20b (FIG. 9), projecting form 1c: projecting part 20c (FIG. 10), projecting form 1d: projecting part 20d (FIG. 11) has been described.

  The technique disclosed in the present specification is not limited to the housing portions 6a to 6d, and any one of the protruding forms 1a, 1b, 1c, 1d and the protruding form 2 can be applied to the form A. Any of the protruding forms 1a, 1b, 1c, 1d and the protruding form 2 can be applied to B, and any of the protruding forms 1a, 1b, 1c, 1d and the protruding form 2 can be applied to the form C. . Moreover, you may apply any of the protrusion form 1a, 1b, 1c, 1d, and the protrusion form 2 to the form (form D: illustration abbreviation) by which the protrusion part is provided in the bottom part and side part of the accommodating part. What is common to all the forms is that at least the bottom portion of the storage portion is provided with a protruding portion that protrudes toward the clearance (the clearance between the storage portion and the tank lid portion). By providing the protruding portion at the bottom of the housing portion, the area of the outer surface of the housing portion can be increased without substantially increasing the space size of the fuel tank lid unit including the housing portion, and the heat radiation of the housing portion can be increased. Can be improved.

  The description of the examples continues. The accommodating portions 6f to 6j described below are modifications of the accommodating portion 6a. That is, a protrusion is provided only at the bottom of the housing part (form A), and a recess is formed on the inner space side (protrusion form 1). About the accommodating parts 6f-6j, only difference with the accommodating part 6a is demonstrated, About the characteristic which is common in the accommodating part 6a, description may be abbreviate | omitted by attaching | subjecting the same reference number as the accommodating part 6a.

(Sixth embodiment)
The accommodating part 6f is demonstrated with reference to FIG. The housing portion 6 f is provided with a through hole 24 in a part of the bottom portion 18. The through-hole 24 is provided in a portion (non-recessed surface) where the protruding portion 20 is not provided. Further, the waterproof film 26 is provided on the surface of the bottom portion 18 (the surface inside the housing portion 6f) so as to cover the through hole 24. By providing the through hole 24, the heat in the housing portion 6f is easily released to the outside of the housing portion 6f. The waterproof film 26 has air permeability and waterproofness. Therefore, it is possible to prevent moisture from entering the housing portion 6f through the through hole 24. As the waterproof membrane 26, for example, a vent filter provided with a PTFE (polytetrafluoroethylene) porous membrane is used.

(Seventh embodiment)
The accommodating part 6g is demonstrated with reference to FIG. In the accommodating portion 6g, the end portion of the protruding portion 20 is in contact with the tank lid portion 2. That is, a part of the bottom portion 18 of the accommodating portion 6 g is in contact with the tank lid portion 2. The accommodating portion 6g can increase the rigidity of the accommodating portion 6g while ensuring a gap between the bottom portion 18 and the tank lid portion 2.

  The storage portions 6f and 6g described above have a feature that the waterproof film 26 is provided (feature x), and the protruding portion 20 is in contact with the tank lid portion 2 (feature y). The features x and y can be applied to all of the accommodating portions to which any one of the protruding forms 1a, 1b, 1c, and 1d and the protruding form 2 is applied to any of the above forms A to D.

(Eighth embodiment)
The accommodating part 6h is demonstrated with reference to FIG. In the accommodating part 6h, the electronic circuit 8a is arrange | positioned in the accommodating part 6h. The electronic circuit 8a includes a plurality of electronic components 7a, 7b, and 7c. Of the electronic components 7a, 7b and 7c, the electronic component 7c has the largest size (length in the vertical direction). The electronic component 7c is a capacitor. In the housing portion 6h, the lower part of the electronic component 7c is located in the recess 22. By positioning a part of the electronic component 7 c in the recess 22, the height (length in the vertical direction) of the accommodating portion 6 h is suppressed from increasing. In other words, by positioning a part of the electronic component 7 c in the recess 22, the bottom 18 of the portion where the small electronic component (electronic component 7 a, 7 b) is placed is positioned upward, and the size of the gap 70 is increased. I am letting.

(Ninth embodiment)
The accommodating part 6i is demonstrated with reference to FIG. In the accommodating part 6i, the bottom part 18 inclines below toward the protrusion part 20 from the edge part (side part 14 side). Therefore, the area of the bottom part 18 becomes larger than the accommodating part 6h (refer FIG. 14), and heat dissipation is further improved.

  In the housing 6h described above, the shape of the protruding portion 20 is the protruding configuration 1a (see the protruding portion 20a, FIG. 9), and the receiving portion 6i has the protruding portion 20 in the protruding configuration 1b (the protruding portion 20b, FIG. 10). See). In the accommodating part 6h and the accommodating part 6i, as long as the hollow 22 into which a part of the electronic component 7c can enter is provided, the shape of the protruding part 20 may be any of the protruding forms 1a to 1d. Moreover, in the accommodating part of form BD, the hollow 22 into which a part of electronic component 7c can penetrate | invade can also be provided.

(Tenth embodiment)
With reference to FIG. 16, the accommodating portion 6j will be described. In the accommodating portion 6j, the bottom portion 18 is curved in an arc shape downward from the end portion (side portion 14 side) toward the center portion. In the accommodating portion 6j, the entire bottom portion 18 protrudes in an arc shape toward the tank lid portion 2. That is, the protrusion 20 is formed by the entire bottom 18, and the recess 22 is formed by the entire inner space side of the bottom 18 (protrusion 20). The accommodating portion 6j accommodates an electronic circuit in which a large electronic component 7b, 7c is arranged at the center among a plurality of mounted electronic components 7a, 7b, 7c, 7d, like the electronic circuit 8b. Is suitable. Specifically, the accommodating portion 6j can be suitably used for accommodating an electronic circuit in which a capacitor is disposed in the center of the electronic circuit. The feature that the bottom 18 is curved in an arc shape can also be applied to the accommodating portions of the forms B to D.

  In the above embodiment, the fuel tank lid unit in which the housing portion and the tank lid portion are integrated (integrated molding) has been described. However, the accommodating portion and the tank lid portion may be separate. In other words, the fuel tank lid unit may be configured by connecting the separate housing portion and the tank lid portion. Further, the upper lid of the housing portion may be made of resin. In this case, the material of the upper lid may be the same resin as the side part, or may be a resin different from the side part. What is important is that a gap is provided between the accommodating portion and the tank lid portion, and at least a bottom portion of the accommodating portion is provided with a protruding portion that protrudes toward the tank lid portion.

  As mentioned above, although embodiment of this invention was described in detail, these are only illustrations and do not limit a claim. The technology described in the claims includes various modifications and changes of the specific examples illustrated above. 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. In addition, the technology illustrated in the present specification or the drawings achieves a plurality of objects at the same time, and has technical utility by achieving one of the objects.

1: Fuel tank lid unit 2: Tank lid portion 5: Support portion 6: Housing portion 8: Electronic circuit 20: Protruding portion 22: Depression 50: Fuel tank 70: Clearance

Claims (9)

A tank lid that closes the opening at the top of the fuel tank;
A storage part that is provided on the tank lid part and in which an electronic circuit is stored in the internal space;
A support portion provided between the tank lid portion and the bottom portion of the storage portion, and forming a gap between the tank lid portion and the storage portion;
A fuel tank lid unit comprising:
Protruding portions that protrude toward the outside of the accommodating portion are provided on the wall surface of the accommodating portion,
The protruding portion is provided at least at the bottom of the accommodating portion,
The fuel tank lid unit, wherein the gap communicates with a space outside the fuel tank lid unit.   The fuel tank lid unit according to claim 1, wherein a plurality of protrusions are provided on the bottom.   The fuel tank lid unit according to claim 1, wherein a protruding portion is provided on an upper portion of the housing portion.   The fuel tank lid unit according to any one of claims 1 to 3, wherein a protruding portion is provided on a side portion of the housing portion.   The fuel tank lid unit according to any one of claims 1 to 4, wherein a recess is formed on the inner space side of at least one protrusion.   6. The fuel tank lid unit according to claim 5, wherein an inner surface of the recess is inclined from an opening of the recess toward a bottom of the recess with respect to a non-recessed surface where the recess is not formed.   The fuel tank lid unit according to any one of claims 1 to 6, wherein a through hole is provided in the wall surface, and an opening of the through hole is covered with a waterproof film having air permeability.   The fuel tank lid unit according to any one of claims 1 to 7, wherein a protruding portion provided on the bottom portion is in contact with the tank lid portion.   The fuel tank lid unit according to any one of claims 1 to 8, wherein the tank lid portion and the accommodating portion are integrated.

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