JP6499617B2 - Waterproof structure between case and cover - Google Patents

Description

  The present invention relates to a waterproof structure between a case and a cover, and more particularly to a waterproof structure in which the case and the cover are not easily damaged even in an environment subjected to vibration.

  In a waterproof structure using a conventional case and cover, an O-ring is generally used. By interposing the O-ring between the case and the cover, waterproofness of the internal space provided by the case and the cover is ensured. For example, as disclosed in Patent Document 1 and the like, a waterproof structure in which an O-ring is sandwiched in a fitting direction of a case and a cover is common. Specifically, an O-ring is first inserted into an O-ring receiving groove of a case serving as a base. Then, a cover having an internal space is fitted into the case and fixed with screws or the like. At this time, the cover is provided with a protrusion that presses the O-ring from above, and the O-ring is pressed by the protrusion to prevent water from entering from the outside. That is, the O-ring has a structure that is pressed using the fitting force between the case and the cover.

JP 2012-085044 A

  If an O-ring is interposed between the case and the cover for waterproofing, the reaction force of the fitting force between the case and the cover is the periphery of the O-ring, specifically, the O-ring receiving groove into which the O-ring is inserted. Concentrate in the vicinity of the protrusion that presses the O-ring. For example, when the case and the cover are firmly fixed with screws or the like, the vicinity where the reaction force is concentrated may be damaged, or the O-ring may be damaged. Further, for example, in the case of an in-vehicle antenna in which waterproofness is ensured by a case and a cover, the case and the cover receive vibration from the vehicle. In such a case, breakage such as cracks may occur in the vicinity where the reaction force is concentrated. In recent years, since the weight reduction of the vehicle is also demanded, increasing the strength of the case and the cover increases the weight, so it is difficult to simply increase the strength.

  In view of such circumstances, the present invention intends to provide a waterproof structure between a case and a cover that can improve waterproofness while preventing damage to the case and the cover.

  In order to achieve the above-described object of the present invention, a waterproof structure between a case and a cover according to the present invention includes a case side wall erected so as to surround the inside of the case in the fitting direction with the cover, and the case side wall. A cover side wall provided so as to cover the outer side surface of the cover, an inner wall of the cover which is erected in a fitting direction with the case so as to surround the inside of the cover inside the case side wall along the inside of the cover side wall, and the case A band-shaped annular waterproof pad disposed between the inner side surface of the side wall and the outer side surface of the cover inner wall, the outer waterproof rib contacting the inner side surface of the case side wall, and the inner waterproof rib contacting the outer side surface of the cover inner wall A waterproof pad.

  Here, the outer waterproof rib and the inner waterproof rib may have different height levels at the positions where the inner surface and the outer surface of the waterproof pad are arranged.

  Also, the back surface of the waterproof pad at the position where the outer waterproof rib is disposed contacts the outer surface of the inner wall of the cover, and the rear surface of the waterproof pad at the position where the inner waterproof rib is disposed contacts the inner surface of the case side wall. It ’s fine.

  Further, the outer waterproof rib and / or the inner waterproof rib of the waterproof pad may be a double waterproof rib.

  Moreover, the waterproof pad may have a through-hole through which the cable or the notification unit is inserted between the outer waterproof rib and the inner waterproof rib having different height levels.

  Further, the waterproof pad may be tapered from the cover side toward the case side.

  The waterproof structure between the case and the cover of the present invention has an advantage that the waterproof property can be enhanced while preventing the case and the cover from being damaged.

FIG. 1 is a schematic sectional side view for explaining the overall structure of a waterproof structure between a case and a cover of the present invention. FIG. 2 is a schematic sectional side view for explaining the details of the periphery of the waterproof pad of the waterproof structure between the case and the cover of the present invention. FIG. 3 is a schematic view for explaining the details of the periphery of the through hole of the waterproof pad having a waterproof structure between the case and the cover of the present invention. FIG. 4 is a schematic view for explaining an additional function of a waterproof pad having a waterproof structure between the case and the cover of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described together with illustrated examples. FIG. 1 is a schematic sectional side view for explaining the overall structure of a waterproof structure between a case and a cover of the present invention. In the present specification, for the sake of convenience, the lower one is referred to as the case 10 and the upper one is referred to as the cover 20 in the drawings, but the names of the case 10 and the cover 20 are not particularly limited thereto. Of course, the reverse is also possible. The case 10 and the cover 20 are provided with an internal space by fitting them. The case 10 and the cover 20 may be fastened and fixed using, for example, screws, or may be engaged and fixed using hooks. In the illustrated example, the vehicle-mounted antenna is applied with the waterproof structure of the present invention. That is, the electronic circuit 2 and the antenna device 3 are accommodated in the internal space provided by the case 10 and the cover 20. The waterproof structure of the present invention is for waterproofing between the case 10 and the cover 20. This ensures the water tightness of the internal space.

  As shown in the figure, the waterproof structure between the case 10 and the cover 20 of the present invention mainly includes a case side wall 11, a cover side wall 21, a cover inner wall 22, and a waterproof pad 30. Details of each component will be described below.

  The case side wall 11 is erected so as to surround the inside of the case 10 in the fitting direction with the cover 20. That is, the case 10 is formed in a box shape together with the case side wall 11. The case 10 is generally made of a synthetic resin such as ABS resin, and the case side wall 11 may be formed integrally with the case 10. An internal space is provided inside the case 10 by the case side wall 11. Here, in the illustrated example, an example in which the electronic circuit 2 and the antenna device 3 provided on the substrate 1 are fixed to the cover 20 side is shown. However, the present invention is not limited to this, and these may be fixed to the case 10 side.

  The cover side wall 21 is provided so as to cover the outer surface of the case side wall 11. That is, the cover side wall 21 is slightly larger than the case side wall 11. The cover 20 is formed in a box shape together with the cover side wall 21. The cover 20 is also generally made of a synthetic resin such as ABS resin, and the cover side wall 21 may be integrally formed with the cover 20. An outer shape of the cover 20 is defined by the cover side wall 21.

  And the cover inner wall 22 is provided as a characteristic part of the waterproof structure of this invention. The cover inner wall 22 is provided along the inside of the cover side wall 21. Specifically, the cover inner wall 22 is erected in the fitting direction with the case 10 so as to surround the inside of the cover 20 inside the case side wall 11. That is, the cover inner wall 22 is slightly smaller than the case side wall 11. An inner space is provided inside the cover 20 by the cover inner wall 22. The cover inner wall 22 may be formed integrally with the cover 20.

  Moreover, the waterproof pad 30 is provided as a further characteristic part of the waterproof structure of this invention. The waterproof pad 30 is a band-shaped ring and is disposed between the inner side surface of the case side wall 11 and the outer side surface of the cover inner wall 22. The waterproof pad 30 has an outer waterproof rib 31 and an inner waterproof rib 32. The outer waterproof rib 31 is a rib that contacts the inner surface of the case side wall 11. The inner waterproof rib 32 is a rib that abuts against the outer surface of the cover inner wall 22. The waterproof pad 30, the outer waterproof rib 31, and the inner waterproof rib 32 may be made of a rubber material such as silicone rubber, and these may be integrally formed. Specifically, the waterproof pad 30 may be disposed so that the inner surface of the waterproof pad 30 contacts the outer surface of the cover inner wall 22. That is, it is preferable that the circumferential length of the outer surface of the cover inner wall 22 and the circumferential length of the waterproof pad 30 are substantially the same, and a certain amount of tension of the waterproof pad 30 is applied to the cover inner wall 22. At the time of assembly, first, the substrate 1 on which the electronic circuit 2 and the antenna device 3 are provided is fixed in the internal space of the cover 20. Thereafter, the waterproof pad 30 is disposed on the outer surface of the cover inner wall 22. When the case 10 is fitted to the cover 20, the inner side surface of the case side wall 11 comes into contact with the outer side surface of the waterproof pad 30. Thereby, the water tightness of the internal space is ensured.

  In the example shown in FIG. 1, the waterproof pad 30 is tapered from the cover 20 side toward the case 10 side. Thereby, when fitting the case 10 to the cover 20 at the time of assembly, workability | operativity improves. That is, at the time of assembly, the case 10 can be easily fitted to the cover 20 without the top of the case side wall 11 being caught by the waterproof pad 30 disposed on the outer surface of the cover inner wall 22.

  As illustrated, the waterproof structure between the case and the cover of the present invention is a structure in which the space between the case side wall 11 and the cover inner wall 22 is waterproofed by a waterproof pad 30. Therefore, unlike the conventional structure in which the case 10 and the cover 20 are pressed using a fitting force that fixes the case 10 and the cover 20 with screws or the like, the waterproof pad 30 can ensure waterproofness regardless of the fitting direction. That is, the waterproof pad 30 having the waterproof structure of the present invention has a distance between the case sidewall 11 and the cover inner wall 22 and the thickness of the waterproof pad 30 (more specifically, from the tip of the outer waterproof rib 31 to the tip of the inner waterproof rib 32). This is a structure that is pressed in relation to the length). For this reason, the reaction force of the fitting force between the case 10 and the cover 20 is not given to the periphery of the waterproof pad 30. Therefore, even if the case 10 and the cover 20 are firmly fixed by screws or the like, the waterproof structure of the present invention is not affected at all. Further, even when the waterproof structure between the case and the cover of the present invention is applied to the vehicle-mounted antenna, the waterproof structure is not directly subjected to vibration from the vehicle. Therefore, the case 10 and the cover 20 are not damaged by the reaction force of the waterproof pad 30. Further, the waterproof structure between the case and the cover of the present invention takes into account the fitting force between the case 10 and the cover 20 if the distance between the case side wall 11 and the cover inner wall 22 and the thickness of the waterproof pad 30 are manufactured as designed. Without having to do so, there is also an effect that the waterproof performance as designed can be obtained.

  Furthermore, as shown in the figure, the waterproof pad 30 is disposed further inside the case side wall 11 inside the cover side wall 21, and therefore, the waterproof property deterioration due to aged deterioration and deformation of the cover side wall 21 hardly occurs.

  Next, details of the waterproof pad 30 will be described with reference to FIG. FIG. 2 is a schematic sectional side view for explaining the details of the periphery of the waterproof pad of the waterproof structure between the case and the cover of the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same parts. In addition, in order to describe the waterproof rib in detail, a partially enlarged view surrounded by a dotted circle is also shown. The outer waterproof rib 31 and the inner waterproof rib 32 shown in FIG. 1 each have a single layer, that is, a single rib. However, in the waterproof structure of the present invention, the outer waterproof rib 31 and the inner waterproof rib 32 may each be composed of two ribs in order to improve waterproofness. That is, FIG. 2 shows an example in which the outer waterproof rib 31 and the inner waterproof rib 32 are each constituted by a double waterproof rib. In the illustrated example, both the outer waterproof rib 31 and the inner waterproof rib 32 are composed of double waterproof ribs, but the present invention is not limited to this, and either one may be double. By using the double waterproof rib, the waterproof property can be enhanced and the reaction force applied to the case side wall 11 and the cover inner wall 22 can be dispersed. That is, if the reaction force is high, a strong force is required when assembling the case 10 and the cover 20, so that it is possible to improve workability by dispersing.

  Further, in the example shown in FIG. 2, the outer waterproof rib 31 and the inner waterproof rib 32 have different height levels at positions arranged on the inner surface and the outer surface of the waterproof pad 30. Specifically, in the illustrated example, the inner waterproof rib 32 is disposed at a higher position than the outer waterproof rib 31. By making the height level at which the outer waterproof rib 31 and the inner waterproof rib 32 are arranged different from each other, the reaction force applied to the case side wall 11 and the cover inner wall 22 can be dispersed. Thereby, workability | operativity at the time of an assembly improves.

  At this time, if the reaction force becomes too low, the waterproof property is lowered. Therefore, the reaction force is preferably as designed. For example, as shown in the figure, the back surface of the waterproof pad 30 at the position where the outer waterproof rib 31 is disposed may be configured to contact the outer surface of the cover inner wall 22. Similarly, the back surface of the waterproof pad 30 at the position where the inner waterproof rib 32 is disposed may be configured to contact the inner surface of the case side wall 11. That is, the back surface side of the outer waterproof rib 31 and the inner waterproof rib 32 is configured to always abut against the wall, and the back surface side only needs to be configured to be held by the wall even when the waterproof rib is pressed. With this configuration, the outer waterproof rib 31 and the inner waterproof rib 32 can be configured so that the distance between the gaps to be arranged is constant, so that a reaction force as desired is applied.

  Moreover, you may vary the direction which the front-end | tip of the outer side waterproof rib 31 and the inner side waterproof rib 32 faces like the example of illustration. At the time of assembly, the waterproof pad 30 is inserted from the lower side to the upper side in the drawing, so that the inner waterproof rib 32 has its tip directed downward. Thereafter, when the case 10 is fitted to the cover 20, the case side wall 11 is inserted from the lower side to the upper side in the drawing, so that the outer waterproof rib 31 has its tip directed upward. As a result, both the outer waterproof rib 31 and the inner waterproof rib 32 reliably come into contact with the cover inner wall 22 and the case side wall 11.

  Note that the waterproof structure between the case and the cover of the present invention is not limited to the illustrated example described above, and more ribs may be provided. For example, a rib disposed at a position between the cover side wall 21 and the cover inner wall 22 may be additionally provided on the waterproof pad 30 as appropriate.

  Further, in the example shown in FIG. 2, the waterproof pad 30 itself is not tapered, but the cover 10 has a shape in which the case 10 side (front end side) is inclined toward the internal space side together with the cover inner wall 22. Thereby, the annular waterproof pad 30 was configured to be tapered as a whole from the cover 20 side toward the case 10 side. Even if comprised in this way, since case side wall 11 becomes easy to fit, workability | operativity improves when fitting case 10 to cover 20 at the time of an assembly.

  Further, in the example shown in FIG. 2, an example in which the substrate 1 is fixed to the cover inner wall 22 is shown. As shown in the drawing, a welding pin 5 for fixing the substrate 1 may be provided on the top of the cover inner wall 22 so that the substrate can be appropriately fixed.

  Next, the through hole of the waterproof pad 30 will be described with reference to FIG. FIG. 3 is a schematic diagram for explaining the details of the periphery of the through hole of the waterproof pad having a waterproof structure between the case and the cover of the present invention, and FIG. 3 (a) is a side sectional view passing through the through hole. 3 (b) is a front view of a portion where a through hole is provided. In the figure, the same reference numerals as those in FIGS. 1 and 2 denote the same components. As illustrated, the waterproof pad 30 is provided with a through hole 35. For example, a cable from an antenna device or an amplifier circuit provided in an internal space provided by the case 10 and the cover 20 is inserted into the through hole 35. Moreover, notification parts, such as LED and a speaker, may be inserted. Here, the through-hole 35 should just be provided between the outer side waterproof rib 31 and the inner side waterproof rib 32 from which the height level of the position to arrange | position differs. As shown in the figure, only the periphery of the through-hole 35, the back surface of the waterproof pad 30 at the position where the waterproof ribs 31 and 32 are disposed does not contact the cover inner wall 22 or the case side wall 11, and is provided on the case 10 It is also possible to adopt a structure that abuts against the cover side wall 21. However, the present invention is not limited to this, and as in the example shown in FIGS. 1 and 2, for example, the inner wall 22 of the cover extends to the bottom of the case 10 and is waterproof at a position where the outer waterproof rib 31 is disposed. The back surface of the pad 30 may be configured to contact the outer surface of the cover inner wall 22. Of course, waterproof ribs may be additionally provided at other locations as appropriate. For example, additional waterproof ribs are arranged at different height levels on the back surface of the waterproof pad 30 at the position where the outer waterproof rib 31 is disposed or on the back surface of the waterproof pad 30 at the position where the inner waterproof rib 32 is disposed. You may do it.

  Thus, in the waterproof structure between the case and the cover of the present invention, even if the through hole 35 serving as an access port between the internal space and the outside is provided, the periphery of the through hole can be waterproofed by the waterproof rib.

  Next, an additional function of the waterproof pad will be described with reference to FIG. FIG. 4 is a schematic diagram for explaining an additional function of a waterproof pad having a waterproof structure between the case and the cover of the present invention, FIG. 4 (a) is a side sectional view, and FIG. 4 (b) is a cover. FIG. In the figure, the same reference numerals as those in FIGS. 1 to 3 denote the same parts. As illustrated, the waterproof pad 30 may be provided with a cushion portion 36. The cushion portion 36 is provided in a direction perpendicular to the belt-shaped annular waterproof pad 30. That is, the cushion part 36 may be provided in a direction perpendicular to the fitting direction of the case 10 and the cover 20. The cushion portion 36 may be integrally formed with the waterproof pad 30. As shown in the figure, the substrate 1 can be securely fixed by providing the cushion portion 36 between the substrate 1 on which the electronic circuit 2 and the antenna device 3 are provided and the protrusion 15 provided on the case 10. It becomes. For example, when the substrate 1 is fixed to the cover 20 with the welding pins 5, the substrate 1 may be detached from the cover 20 due to vibration. Therefore, the substrate 1 is fixed by sandwiching the cushion portion 36 between the substrate 1 and the protruding portion 15, and it is possible to make it difficult for the substrate 1 to be detached from the welding pins 5 even when subjected to vibration or the like. In addition, since the cushion part 36 is not for waterproofing, the pressing force by the protrusion part 15 does not need to be high. Therefore, there is no fear of the case 10 being damaged by the reaction force from the cushion portion 36.

  It should be noted that the waterproof structure between the case and the cover of the present invention is not limited to the illustrated example described above, and it is needless to say that various modifications can be made without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Board | substrate 2 Electronic circuit 3 Antenna apparatus 5 Welding pin
DESCRIPTION OF SYMBOLS 10 Case 11 Case side wall 15 Protrusion part 20 Cover 21 Cover side wall 22 Cover inner wall 30 Waterproof pad 31 Outer waterproof rib 32 Inner waterproof rib 35 Through-hole 36 Cushion part

Claims (8)

A waterproof structure for waterproofing between the case and the cover,
A case side wall erected so as to surround the inside of the case toward the fitting direction with the cover;
A cover side wall provided to cover an outer surface of the case side wall;
A cover inner wall erected in the fitting direction with the case so as to surround the inside of the cover inside the case side wall along the inside of the cover side wall;
A belt-shaped annular waterproof pad disposed between the inner side surface of the case side wall and the outer side surface of the cover inner wall, and stands vertically or obliquely in the fitting direction of the case and the cover so as to contact the inner side surface of the case side wall. an outer waterproof rib is set, and a waterproof pad having an inner waterproof rib erected on vertically or obliquely in the fitting direction of the case and the cover so as to abut against the outer surface of the cover inner wall,
A waterproof structure between the case and the cover.   2. The waterproof structure between the case and the cover according to claim 1, wherein the outer waterproof rib and the inner waterproof rib have different height levels at positions arranged on the inner surface and the outer surface of the waterproof pad. Waterproof structure between case and cover.   The waterproof structure between the case and the cover according to claim 1 or 2, wherein the back surface of the waterproof pad at the position where the outer waterproof rib is disposed contacts the outer surface of the inner wall of the cover, and the inner waterproof rib is disposed. A waterproof structure between a case and a cover, characterized in that the back surface of the waterproof pad at the position abuts against the inner surface of the case side wall.   The waterproof structure between the case and the cover according to any one of claims 1 to 3, wherein the outer waterproof rib and / or the inner waterproof rib of the waterproof pad is a double waterproof rib. Waterproof structure between covers.   5. The waterproof structure between the case and the cover according to claim 2, wherein the waterproof pad includes a cable between the outer waterproof rib and the inner waterproof rib having different height levels at positions of the waterproof pads. Or it has a through-hole which penetrates an alerting | reporting part, The waterproof structure between a case and a cover.   6. The waterproof structure between the case and the cover according to claim 1, wherein the waterproof pad is tapered from the cover side toward the case side. Construction.   The waterproof structure between the case and the cover according to any one of claims 1 to 6, wherein the outer waterproof rib is erected obliquely from the case toward the cover direction, and the inner waterproof rib is extended from the cover to the case direction. Waterproof structure between the case and the cover, characterized in that it is erected diagonally toward the cover.   A waterproof structure for waterproofing between the case and the cover,
  A case side wall erected so as to surround the inside of the case toward the fitting direction with the cover;
  A cover side wall provided to cover an outer surface of the case side wall;
  A cover inner wall erected in the fitting direction with the case so as to surround the inside of the cover inside the case side wall along the inside of the cover side wall;
  An annular waterproof pad disposed between the inner side surface of the case side wall and the outer side surface of the cover inner wall, the outer waterproof rib contacting the inner side surface of the case side wall, and the inner waterproofing contacting the outer side surface of the cover inner wall The outer waterproof ribs have different height levels at the positions where the outer waterproof ribs and the inner waterproof ribs are disposed on the inner surface and the outer surface of the waterproof pad, and the height levels of the disposed positions are different. A waterproof pad having a through-hole through which a cable or a notification part is inserted between the inner waterproof rib and the inner waterproof rib;
  A waterproof structure between the case and the cover.