JP2019030974A - Mounting structure of resin part - Google Patents

Abstract

To provide means capable of sufficiently suppressing occurrence of resonance to a resin part, confirming fusion accuracy (airtightness), and preventing a fused part from exposing from the resin part.SOLUTION: A mounting structure of a resin part of this invention comprises: a resin case 2 opening to one side; a resin cover 7 that covers an opening of the case 2 and is fused to the case 2 entirely circumferentially; a resin columnar support 8 that is vertically provided on a bottom part 21 of the case 2 in an extending manner to a cover 7 side, engages with the cover 7, and is formed separately from the cover 7. The cover 7 and the columnar support 8 are fused to one another circumferentially at engaging faces thereof. And, a through hole 70 is formed in the cover 7 to be positioned inside relative to the fused part of the cover 7 and the columnar support 8 viewed from a thickness direction of the cover.SELECTED DRAWING: Figure 2

Description

  The technology disclosed in this specification relates to a resin component mounting structure.

  A resin component mounting structure is known in the prior art.

  The conventional resin parts mounting structure has a mounting boss protruding on one side of the resin parts to be bonded and fixed to each other, and an insertion hole through which the mounting boss is inserted. There is one in which both resin parts are joined by welding and crimping the tip of the mounting boss after the boss is inserted through the insertion hole (see, for example, Patent Document 1).

Japanese Patent No. 3939185

  According to Patent Document 1, after mounting the mounting boss is inserted into the insertion hole, the tip of the mounting boss is welded and crimped to secure the shear strength and prevent the airtight resin component from being suppressed. It can be carried out.

  However, since the caulking portion is exposed from the other resin component in the one of Patent Document 1, if an article adopting the attachment structure is attached somewhere, the caulking portion may interfere with the attachment.

  The technology disclosed in the present specification has been made in view of the above points, and the problem is to sufficiently suppress the occurrence of resonance in the resin component and to improve the welding accuracy (airtightness). It is to be able to confirm and prevent the welded portion from being exposed from the resin component.

  The technology disclosed in this specification includes a resin case that opens toward one side, a resin cover that covers the opening of the case and is welded to the case, and a bottom portion of the case. The resin component mounting structure includes a resin-made support column that is erected so as to extend toward the cover and is separate from the cover that contacts the cover. The cover and the support column are welded circumferentially at the contact surface. And the through-hole is formed in the said cover so that it may be located inside the welding part of the said cover and the said support | pillar when it sees from the thickness direction.

  According to the technology disclosed in this specification, it is possible to sufficiently suppress the occurrence of resonance in the resin parts by attaching the resin parts more securely, and it is possible to confirm the welding accuracy (airtightness) by air leak inspection or the like. The welded part is not exposed from the resin part.

It is a disassembled perspective view which shows the electrostatic detection sensor unit which employ | adopted the attachment structure of the resin component which concerns on exemplary embodiment. It is sectional drawing which shows an electrostatic detection sensor unit. It is sectional drawing which shows the principal part of an electrostatic detection sensor unit. It is a top view which shows an electrostatic detection sensor unit. FIG. 9 is a view corresponding to FIG. 3 illustrating an electrostatic detection sensor unit according to Modification Example 1; FIG. 10 is a view corresponding to FIG. 3 illustrating an electrostatic detection sensor unit according to Modification 2. FIG. 10 is a view corresponding to FIG. 3 showing an electrostatic detection sensor unit according to Modification 3. FIG. 10 is a view corresponding to FIG. 3 illustrating an electrostatic detection sensor unit according to Modification Example 4; FIG. 10 is a view corresponding to FIG. 3 illustrating an electrostatic detection sensor unit according to Modification Example 5. FIG. 10 is a view corresponding to FIG. 2 and showing an electrostatic detection sensor unit according to Modification 6. FIG. 9 is a view corresponding to FIG. 4 and showing an electrostatic detection sensor unit according to Modification 7. It is sectional drawing which shows the principal part of the electrostatic detection sensor unit which concerns on the modification 8. FIG. 10 is a view corresponding to FIG. 4 and showing an electrostatic detection sensor unit according to Modification 9;

  Hereinafter, exemplary embodiments will be described in detail with reference to the drawings.

  FIG. 1 is an exploded perspective view showing an electrostatic detection sensor unit employing the resin component mounting structure according to the present embodiment, FIG. 2 is a cross-sectional view showing the electrostatic detection sensor unit, and FIG. 3 is an electrostatic detection sensor. Sectional drawing which shows the principal part of a unit, FIG. 4 is a top view which shows an electrostatic detection sensor unit.

  The electrostatic detection sensor unit 1 is attached to a vehicle, for example. The electrostatic detection sensor unit 1 includes a resin case 2 (resin component), a first sensor plate 3, a second sensor plate 4, a resin holder 5 (resin component), a ground substrate 6, and a resin. And a cover 7 (resin component).

  The case 2, the first sensor plate 3, the second sensor plate 4, the holder 5, the ground substrate 6 and the cover 7 are arranged in this order in the arrangement direction of the first sensor plate 3, the second sensor plate 4 and the ground substrate 6 (hereinafter, This arrangement direction is referred to as “substrate arrangement direction”).

  The case 2 houses the electrostatic detection sensor main body composed of the first sensor plate 3, the second sensor plate 4, the holder 5, the ground substrate 6 and the like together with the cover 7. Case 2 is formed in a rectangular parallelepiped box shape. The case 2 opens toward one side (the cover 7 side). A step portion 20 is formed over the entire periphery of the opening periphery of the case 2. Boss portions 22 are formed in a cylindrical shape at the four corners of the bottom portion 21 of the case 2 so as to extend toward the cover 7.

  The first sensor plate 3, the second sensor plate 4, and the ground substrate 6 are printed circuit boards. The first sensor plate 3, the second sensor plate 4, and the ground substrate 6 are formed in a substantially rectangular shape. First insertion holes 30, 40, and 60 are formed in a circular shape at the center of the first sensor plate 3, the second sensor plate 4, and the ground substrate 6. In the four corners of the first sensor plate 3, the second sensor plate 4 and the ground substrate 6, second insertion holes 31, 41 and 61 are formed in a circular shape. Electrodes are formed on the first sensor plate 3 and the second sensor plate 4. A ground electrode is formed on the ground substrate 6.

  The holder 5 has a skeleton structure formed in a substantially rectangular parallelepiped shape. One support column 8 is integrally formed at the center of the holder 5 so as to extend on both sides in the substrate arrangement direction. That is, the column 8 is separate from the case 2 and the cover 7. The support column 8 is formed in a bottomed and uncovered cylindrical shape that opens toward the cover 7 side. The column 8 has a smaller diameter on the cover 7 side than on the case bottom 21 side. The column 8 is inserted through the first insertion holes 30, 40, 60 of the first sensor plate 3, the second sensor plate 4, and the ground substrate 6, and both end surfaces in the axial direction are the back surfaces of the case bottom 21 (case bottom 21 And the back surface of the cover 7 (the surface of the cover 7 on the case 2 side). Thereby, the support | pillar 8 is standingly arranged so that it may extend in the center part of the case bottom 21 to the cover 7 side.

  The first sensor plate 3, the second sensor plate 4, and the ground substrate 6 are fixed to the holder 5 with screws. In the holder 5 to which the first sensor plate 3, the second sensor plate 4 and the ground substrate 6 are fixed, the boss portion 22 of the case 2 is inserted through the second insertion holes 31 and 41 of the first sensor plate 3 and the second sensor plate 4. In this state, the screw is fixed to the boss portion 22 with a screw inserted through the second insertion hole 61 of the ground substrate 6. Thereby, the support column 8 is fixed to the case 2.

  The cover 7 is a member that covers the opening of the case 2. The cover 7 is formed in a substantially rectangular shape. A through hole 70 is formed in a circular shape at the center of the cover 7. The through hole 70 is formed so as to be located on the inner side of the hollow portion 8a of the support column 8 when viewed from the substrate arrangement direction. That is, the through hole 70 has a smaller hole diameter than the hollow portion 8a. Ribs 71 are formed on the back surface of the cover 7. The outer peripheral edge portion of the cover 7 is continuously welded to the step portion 20 of the case 2 by laser welding (hereinafter, this welded portion is referred to as “the entire circumferential welded portion W1 between the case 2 and the cover 7”). ). The cover 7 and the support column 8 are continuously laser-welded in a circumferential manner at the contact surfaces 72 and 80 (hereinafter, this weld portion is referred to as “welding portion W2 between the cover 7 and the support column 8”). Thereby, the through-hole 70 of the cover 7 is located inside the welded portion W <b> 2 between the cover 7 and the column 8 when viewed from the substrate arrangement direction (the thickness direction of the cover 7).

  Here, when confirming the accuracy (air tightness) of the entire circumference welding of the case 2 and the cover 7 and the welding of the cover 7 and the support column 8, an air leak inspection is performed using a vacuum type air leak inspection apparatus. Specifically, the electrostatic detection sensor unit 1 is accommodated in the chamber, the gap space between the chamber and the electrostatic detection sensor unit 1 is reduced to a predetermined pressure, and after further reducing the pressure in the chamber from this state, The pressure in the chamber is measured, and the leakage of gas from the through hole 70 of the cover 7 is detected based on the measurement result. If the accuracy of the welding of the entire circumference of the case 2 and the cover 7 or the welding of the cover 7 and the support column 8 is insufficient, the gas in the electrostatic detection sensor unit 1 leaks from the circumferential welding portion W1 and the through hole 70. Come out.

  As described above, according to the present embodiment, in addition to the cover 7 and the case 2 being welded all around, the cover 7 and the support column 8 erected on the case bottom 21 so as to extend toward the cover 7 are provided. Since the contact surfaces 72 and 80 are circumferentially welded, even if the cover 7 is fixed at the approximate center and vibration is applied to the electrostatic detection sensor unit 1, the resonance frequency of the cover 7 is set to the high frequency side. Therefore, the occurrence of resonance in the cover 7 can be sufficiently suppressed.

  Further, since the through hole 70 is formed in the cover 7 so as to be located inside the welded portion W2 between the cover 7 and the support column 8 when viewed in the thickness direction, the through hole 70 is used. By performing the air leak inspection, it is possible to confirm whether not only the case 2 and the cover 7 but also the cover 7 and the support column 8 are welded without a gap.

  Further, since the cover 7 and the support column 8 are welded at the contact surfaces 72 and 80, the welded portion W <b> 2 between the cover 7 and the support column 8 is not exposed from the cover 7.

  Moreover, since the support | pillar 8 is formed in the cylindrical shape opened toward the cover 7, the support | pillar 8 can be formed easily.

-Modification 1-
This modification is different from the above exemplary embodiment in the configuration of the contact surface 80 of the support column 8 with the cover 7, but is the same configuration as the above exemplary embodiment in other respects. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 5 is a view corresponding to FIG. 3 showing the electrostatic detection sensor unit 1 according to this modification. On the contact surface 80 of the support column 8 with the cover 7, a welding rib 81 is formed in a circumferential shape as a welding allowance. Thereby, welding with the cover 7 and the support | pillar 8 becomes more reliable, and the welding precision (airtightness) of this welding part W2 can be improved. FIG. 5 is a diagram showing a state before welding, and the state after welding is equivalent to the state shown in FIG.

-Modification 2-
In this modification, the configuration of the contact surfaces 72 and 80 between the cover 7 and the support column 8 is different from that in the above exemplary embodiment, but the other points are the same as those in the above exemplary embodiment. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 6 is an equivalent view of FIG. 3 showing the electrostatic detection sensor unit 1 according to this modification. A concave portion 82 is formed in a circular shape at the center of the contact surface 80 of the support column 8 with the cover 7. On the contact surface 72 of the cover 7 with the support column 8, a convex portion 73 that fits into the concave portion 82 is formed in a cylindrical shape at a portion corresponding to the concave portion 82. The hollow portion of the convex portion 73 forms a part of the through hole 70 of the cover 7.

  As described above, according to this modification, the recess 82 is formed on the contact surface 80 of the support column 8 with the cover 7, and the recess 82 is fitted on the contact surface 72 of the cover 7 with the support column 8. Since the convex portion 73 is formed, the cover 7 can be reliably positioned with respect to the case 2 coupled to the holder 5 by fitting the convex portion 73 into the concave portion 82.

-Modification 3-
This modified example is different from the modified example 2 in the configuration of the contact surfaces 72 and 80 between the cover 7 and the support column 8, but is the same as the modified example 2 in other points. Therefore, in the following description, a duplicate description of the same components as those of the second modification may be omitted.

  FIG. 7 is an equivalent view of FIG. 3 showing the electrostatic detection sensor unit 1 according to this modification. The contact surfaces (side contact surfaces) 82a and 73a between the recess 82 and the projection 73 excluding the contact surface between the bottom surface of the recess 82 of the support column 8 and the top surface of the projection 73 of the cover 7 are from the cover 7 side. The inclined surface extends linearly and in a cross-sectional view so as to approach the through hole 70 of the cover 7 toward the opposite side. That is, the hole diameter of the concave portion 82 and the outer diameter of the convex portion 73 are reduced from the cover 7 side toward the opposite side. Thereby, the convex part 73 can be easily fitted to the concave part 82, and the positioning of the cover 7 with respect to the case 2 coupled to the holder 5 can be performed more reliably.

-Modification 4-
This modified example is different from the modified example 3 in the configuration of the through hole 70 of the cover 7, but is the same as the modified example 3 in other points. Therefore, in the following description, a duplicate description of the same components as those of Modification 3 may be omitted.

  FIG. 8 is a view corresponding to FIG. 3 showing the electrostatic detection sensor unit 1 according to this modification. The through hole 70 has the same diameter after being reduced in diameter as it goes from the cover 7 side to the opposite side. Thereby, since it becomes easy to visually recognize the position of the through-hole 70, the positioning workability | operativity with respect to the case 2 combined with the holder 5 of the cover 7 can be improved.

-Modification 5-
In this modification, the configuration of the contact surfaces 72 and 80 between the cover 7 and the support column 8 is different from that in the above exemplary embodiment, but the other points are the same as those in the above exemplary embodiment. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 9 is a view corresponding to FIG. 3 showing the electrostatic detection sensor unit 1 according to this modification. A concave portion 74 is formed in a circular shape at the center of the contact surface 72 of the cover 7 with the support column 8. On the contact surface 80 of the support column 8 with the cover 7, a convex portion 83 that fits into the concave portion 74 is formed in a cylindrical shape at a portion corresponding to the concave portion 74. The contact surfaces 74 a and 83 a (hereinafter referred to as side contact surfaces 74 a and 83 a) between the recess 74 and the projection 83 excluding the contact surface between the bottom surface of the recess 74 and the top surface of the projection 83 are the cover 7. The inclined surface extends linearly in a cross-sectional view so as to move away from the through hole 70 of the cover 7 from the side toward the opposite side. That is, the hole diameter of the concave portion 74 and the outer diameter of the convex portion 83 are each increased from the cover 7 side toward the opposite side.

  As described above, according to the present modified example, the recess 74 is formed in the contact surface 72 of the cover 7 with the support column 8, and the contact surface 80 of the support column 8 with the cover 7 is fitted into the recess 74. Since the convex portion 83 is formed, the cover 7 can be reliably positioned with respect to the case 2 coupled to the holder 5 by fitting the convex portion 83 into the concave portion 74.

  Further, since the side contact surfaces 74a and 83a between the concave portion 74 and the convex portion 83 are inclined surfaces, the convex portion 83 can be easily fitted into the concave portion 74 and coupled to the holder 5 of the cover 7. The positioning with respect to the case 2 can be performed more reliably.

  In this modification, the diameter of the hole 74 of the concave portion 74 and the outer diameter of the convex portion 83 are increased from the cover 7 side toward the opposite side, whereby the side contact surface 74a between the concave portion 74 and the convex portion 83 is obtained. 83a are inclined surfaces, but the present invention is not limited to this, and the hole diameter of the recess 74 and the outer diameter of the protrusion 83 may be the same.

-Modification 6
The present modification is different from the exemplary embodiment in the configuration of the support column 8, but is the same as the exemplary embodiment in other points. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 10 is a view corresponding to FIG. 2 showing the electrostatic detection sensor unit 1 according to the present modification. The column 8 is integral with the case 2 and is separate from the holder 5. The support 8 is inserted into the first sensor plate 3, the second sensor plate 4, the first insertion holes 30, 40, 60 of the ground substrate 6 and the holder 5, and the end surface on the cover 7 side in the axial direction is the cover 7. Abuts the back side. Thereby, it is possible to sufficiently suppress the occurrence of resonance in the cover 7, and it is possible to confirm the accuracy (airtightness) of the entire circumference welding between the case 2 and the cover 7 and the welding between the cover 7 and the support column 8. A resin part mounting structure in which the welded portion W2 with the support column 8 is not exposed from the cover 7 can be realized.

-Modification 7-
This modified example is different from the above exemplary embodiment in the configuration of the welded portion W2 between the cover 7 and the support column 8, but is otherwise the same as the above exemplary embodiment. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 11 is a view corresponding to FIG. 4 showing the electrostatic detection sensor unit 1 according to the present modification. The welded portion W2 between the cover 7 and the support column 8 is a straight line L that connects the center C of the cover 7 and an arbitrary point in the entire circumferential welded portion W1 between the case 2 and the cover 7 (in the example of FIG. (L3 is shown in the figure), and the distance from each arbitrary point to the welded portion W2 between the cover 7 and the column 8 is substantially the same (in the example of FIG. 11, it is substantially X-shaped). Yes. Thereby, since the resonance frequency of the cover 7 can be set to the high frequency side, the occurrence of resonance in the cover 7 can be sufficiently suppressed, and the resonance frequency can be made substantially unambiguous. Vibration noise can be reduced.

-Modification 8-
This modification is different from the above exemplary embodiment in the contact configuration between the case 2 and the support column 8, but is the same as the above exemplary embodiment in other points. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 12 is a cross-sectional view showing a main part of the electrostatic detection sensor unit 1 according to this modification. Similar to the contact surfaces 72 and 80 between the cover 7 and the support column 8, the case 2 and the support column 8 are continuously laser-welded circumferentially at the contact surfaces 23 and 84. A through hole 24 is formed in the case bottom portion 21 so as to be located inside a welded portion between the case 2 and the support column 8 when viewed from the thickness direction.

  As described above, since the cover 7 and the case 2 are welded all around, the case 2 and the support column 8 are welded circumferentially at the contact surfaces 23 and 84, so that the resonance frequency of the case 2 is reduced. Since it can be on the high frequency side, the occurrence of resonance in the case 2 can be suppressed.

  Moreover, since the through hole 24 is formed in the case bottom 21 so as to be located inside the welded portion between the case 2 and the support column 8 when viewed in the thickness direction, the through hole 24 is used. By performing the air leak inspection, it is possible to confirm the accuracy of the entire circumference welding between the case 2 and the cover 7, the welding between the case 2 and the column 8, and the welding between the cover 7 and the column 8 (airtightness).

  Further, since the case 2 and the support column 8 are welded at the contact surfaces 23 and 84, the welded portion between the case 2 and the support column 8 is not exposed from the case 2.

-Modification 9-
This modified example is different from the above exemplary embodiment in the configuration of the through hole 70, but is otherwise the same as the above exemplary embodiment. Therefore, in the following description, overlapping description may be omitted for the same constituent elements as those of the exemplary embodiment.

  FIG. 13 is an equivalent view of FIG. 4 showing the electrostatic detection sensor unit 1 according to this modification. The through-hole 70 is composed of two substantially semicircular holes by laying a beam 75 extending in the diametrical direction at the central portion thereof. By adopting such a configuration, the following effects can be obtained.

  When the cover 7 is formed by injection molding, for example, in the case of a circular through hole 70 as shown in FIG. 4, a weld portion (portion where the resin merges) is generated in the vicinity of the through hole 70 depending on the diameter. In this weld portion, the strength may be lower than in other portions. Therefore, in this modification, a beam 75 is formed in the central portion of the through hole 70 so as to extend in the diameter direction. Thereby, since the weld part is reinforced, sufficient strength can be obtained even in the vicinity of the through hole 70 in the cover 7.

  In the present modification, only one beam 75 is formed. However, the present invention is not limited to this. For example, a plurality of beams 75 may be formed, or may be formed in a cross shape or a radial shape. Moreover, you may form a beam in the through-hole 24 of case 2 in FIG.

(Other exemplary embodiments)
In the exemplary embodiment and each of the modifications described above, the resin component mounting structure is employed in the electrostatic detection sensor unit 1, but is not limited thereto, for example, electrostatic detection including a device body to be housed and protected in a case. You may employ | adopt in apparatus units other than the sensor unit 1. FIG.

  In the exemplary embodiment and each of the modifications described above, one support column 8 is formed, but a plurality of support columns 8 may be formed.

  Further, in the exemplary embodiment and each of the above-described modifications, the support column 8 is formed in a bottomed and uncovered cylindrical shape, but is not limited thereto, and may be formed in, for example, a bottomless uncovered cylindrical shape or a columnar shape. .

  Further, in the exemplary embodiment and each of the modifications described above, the cover 7 and the support column 8 are welded circumferentially at the contact surfaces 72 and 80. However, the present invention is not limited thereto, and for example, the cover 7 and the support column 8 are welded in a rectangular circumferential shape. May be.

  In addition, the constituent elements of the exemplary embodiment and the modifications may be arbitrarily combined without departing from the spirit of the technology disclosed in this specification.

  As described above, the technique disclosed in this specification can be applied to a resin component mounting structure or the like.

1 Electrostatic detection sensor unit 2 Case (resin parts)
21 Case bottom 23 Contact surface 24 Through hole 7 Cover (resin part)
70 Through-hole 72 Contact surface 73 Projection 73a Contact surface 74 Concave surface 74a Contact surface 75 Beam 8 Post 80 Contact surface 81 Welding rib 82 Concave surface 82a Contact surface 83 Projection 83a Contact surface 84 Contact surface C Cover Center L A straight line W1 connecting the center of the cover and an arbitrary point in the welded portion between the case and the cover W2 a circumferential welded portion between the case and the cover W2 welded portion between the cover and the column

Claims (8)

A resin case opening toward one side;
A resin cover that covers the opening of the case and is welded to the case all around,
A resin column that is erected so as to extend to the cover side at the bottom of the case, and is separate from the cover that contacts the cover;
The cover and the support column are welded circumferentially at the contact surface,
A resin part mounting structure in which a through hole is formed in the cover so as to be located inside a welded portion between the cover and the support column when viewed in the thickness direction. In claim 1,
The support column is a resin component mounting structure formed in a cylindrical shape opening toward the cover. In claim 1,
A resin part mounting structure in which a welding rib is formed in a circumferential shape on a contact surface of the support column with the cover. In claim 1,
One of the contact surface of the cover with the support column and the contact surface of the support column with the cover is formed with a recess, and the other is formed with a protrusion that fits into the recess. Mounting structure. In claim 4,
The contact structure between the concave portion and the convex portion is a resin component mounting structure in which an inclined surface is provided. In claim 1,
The welded portion between the cover and the support column is formed from each arbitrary point on each straight line connecting the center of the cover and an arbitrary point in the entire circumferential welded portion between the case and the cover. The resin component mounting structure is formed so that the distance to the welded portion is substantially the same. In claim 1,
The support column is separate from the case that contacts the bottom of the case.
The case and the support column are welded circumferentially at the contact surface thereof,
A resin part mounting structure in which a through hole is formed in a bottom portion of the case so as to be located inside a welded portion between the case and the support column when viewed from the thickness direction. In claim 1 or 7,
A resin part mounting structure in which a beam is formed in the through hole so as to extend in a diameter direction.

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