JP6448237B2 - Case waterproof structure - Google Patents

Description

  The present invention relates to a waterproof structure for a housing that includes a case and a cover and has a plurality of wire lead portions.

  An electrical junction box in which electrical components and the like are accommodated in a housing is disclosed in Patent Document 1 below, for example. The electric junction box has an electric wire drawing portion, and the electric wire is drawn through the electric wire drawing portion. The wire drawing portion is preferably structured so that the wire can be drawn with flexibility. In Patent Document 1, a rubber grommet is employed. The grommet is excellent in waterproofness in a state where the electric wire is inserted, but the grommet is not limited to such a grommet, and a corrugated tube formed in a bellows-shaped tube body may be employed.

  In Patent Document 1 below, there is one wire lead-out portion, but a plurality of wire drawing portions may be provided as necessary.

JP 2007-288908 A

  If a plurality of wire lead-out portions are provided and one of them is not used temporarily, an unused wire lead-out portion remains open. Therefore, there is a problem that waterproofness cannot be ensured.

  The present invention has been made in view of the above-described circumstances, and provides a waterproof housing structure that can ensure waterproofness even if there is a wire lead portion that is not used temporarily among a plurality of wire lead portions provided. This is the issue.

The case waterproof structure of the present invention according to claim 1, which has been made to solve the above-described problem, is provided with a plurality of wire lead portions in a case including a case and a cover that covers an opening of the case ,
The said conductive lead-out portion,
A corrugated tube fixing part for fixing the corrugated tube through which the electric wire is inserted ;
A waterproof plug fixing portion for fixing a waterproof plug that closes the wire drawing portion when the electric wire is not pulled out ;
Form the
The corrugated tube fixing part is
A first rib formed inside the case and formed with a notch that can be engaged with the bellows recess of the corrugated tube;
A second rib which is opposed to the first rib at a predetermined interval and is formed on the outside of the case and has a notch that can be engaged with the corrugated recess of the corrugated tube;
Including
The waterproof plug fixing part is
Formed between the first rib and the second rib,
Further, the between the waterproof plug fixing portion and the case bottom wall in a by and said first rib and said second rib of the position of the wire lead-out portion with the formation of, forming a drain hole It is characterized by doing.

  According to a second aspect of the present invention, in the case waterproof structure according to the first aspect, the bottom wall is formed with a misassembly preventing portion as a misassembly preventing portion for the waterproof plug. To do.

  According to the first aspect of the present invention, since the corrugated tube fixing portion and the waterproof plug fixing portion are formed in the wire drawing portion of the housing, the wire drawing portion that is not used temporarily among the plurality of wire drawing portions. Even if it exists, there exists an effect that waterproofness can be ensured by plugging this unused electric wire drawer part with a waterproof plug. In addition, according to the present invention, not only is the wire lead portion covered with the waterproof plug, but also the water drainage hole is prevented from accumulating moisture, so that the waterproof property can be enhanced.

  According to the second aspect of the present invention, since the erroneous assembly preventing portion is formed on the bottom wall of the case of the housing, the operator can be made aware even if the waterproof plug is closed in a different direction, for example. There is an effect that can be done.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view of the terminal block which employ | adopts the housing | casing waterproof structure of this invention, (a) is a figure of the state which used all the electric wire extraction parts, (b) is waterproof without using one of the electric wire extraction parts. It is a figure of the state closed with the stopper. It is a perspective view of the case of FIG. FIG. 3 is a diagram of the case of FIG. 2, (a) is a view as viewed from A, and (b) is an enlarged view of a main part of (a). It is sectional drawing of the waterproofing stopper fixing | fixed part of FIG. It is a figure of the waterproof stopper of FIG. 1, (a) is a perspective view, (b) is a front view, (c) is a side view. It is a perspective view of the state which attached the waterproof plug to the waterproof plug fixing part. It is a figure of the state which assembled | attached the waterproof plug to the waterproof plug fixing | fixed part, (a) is sectional drawing which can understand the external shape of a waterproof plug, (b) is sectional drawing which can understand the back surface shape of a waterproof plug.

  As a structure on the housing side, a corrugated tube fixing portion and a waterproof plug fixing portion are formed in the wire lead-out portion. Even if there is a wire lead portion that is not used among a plurality of wire lead portions provided, waterproofness can be ensured by closing the wire lead portion with a waterproof plug. Further, if water drain holes are further formed, it is possible to prevent water from being accumulated.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 is a perspective view of a terminal block adopting the waterproof case structure of the present invention, in which (a) shows a state in which all the wire lead-out portions are used, and (b) uses one of the wire lead-out portions. It is a figure of the state closed without waterproofing stopper. FIG. 2 is a perspective view of the case of FIG. 3 is a view of the case of FIG. 2, (a) is a view of A view, and (b) is an enlarged view of a main part of (a). 4 is a cross-sectional view of the waterproof plug fixing portion of FIG.

  FIGS. 5A and 5B are views of the waterproof plug of FIG. 1, in which FIG. 5A is a perspective view, FIG. 5B is a front view, and FIG. FIG. 6 is a perspective view of a state in which the waterproof plug is assembled to the waterproof plug fixing portion. 7 is a view showing a state in which the waterproof plug is assembled to the waterproof plug fixing portion. FIG. 7A is a sectional view showing the outer shape of the waterproof plug, and FIG. 7B is a sectional view showing the rear shape of the waterproof plug.

  In FIG. 1, reference numeral 1 indicates a terminal block adopting the waterproof case structure 2 of the invention. The terminal block 1 is mounted on, for example, a vehicle such as an automobile, and is configured so that electrical connection can be made therein. Specifically, the housing 3, a resin corrugated tube 5 fixed to the pair of wire lead portions 4 of the housing 3, an electrical portion (not shown) provided inside the housing 3, and the corrugated An electric wire (not shown) that is inserted into the tube 5 and electrically connected inside the housing 3 is provided.

  The electrical parts (not shown) include connectors, fuses, joint connectors, terminal blocks, and the like. The case waterproof structure 2 includes a structure on the case 3 side and a waterproof plug 51 used when the wire lead-out portion 4 is not used. First, the above configuration will be described.

  The housing 3 includes a resin case 7 and a resin cover 8. On the other hand, the corrugated tube 5 is also made of resin. A known corrugated tube 5 having a circular cross section is employed. The corrugated tube 5 is a flexible tube and is formed in a bellows shape. Specifically, it has a bellows recess 9 that is a recess in the circumferential direction and a bellows projection 10 that is larger in diameter than the bellows recess 9 and convex in the circumferential direction, and these bellows recess 9 and bellows protrusion 10. Are formed in a tubular body having a shape such that the corrugated tube 5 is alternately continuous in the extending direction of the corrugated tube 5. In other words, it is formed into a tubular body having a shape in which a valley and a mountain are continuous.

  1 to 4, in the present embodiment, the case 7 includes a rectangular bottom wall 11 in which the side in the longitudinal direction is formed to be much longer than the side in the short direction, and the above-described case in the bottom wall 11. A pair of long side walls 12 coupled to the position of the side in the longitudinal direction, a pair of short side walls 13 coupled to the side in the short direction of the bottom wall 11, and an opening located above the bottom wall 11 14 and an internal space 15 are formed in the illustrated shape. The case 7 is formed in such a shape that the short side wall 13 is positioned in the wire lead-out portion 4 in the housing 3.

  The bottom wall 11 is formed as a portion arranged at the bottom of the terminal block 1 in the gravity direction. The bottom wall 11 has a flat surface both inside and outside, and a plurality of drain holes 45 described later are formed only through the end portion 16. A plurality of case-side lock portions 17 for the cover 8 are formed on the outer surfaces of the pair of long side walls 12. Moreover, the vehicle fixing | fixed part 18 with respect to the bracket which is not shown in figure is formed in the outer surface of one longitudinal side wall 12 of a pair.

  Reference numeral 19 indicates a corrugated tube fixing portion. The corrugated tube fixing portion 19 is a portion for fixing the corrugated tube 5 on the case 7 side, and is disposed and formed so as to straddle the inner surface of the bottom wall 11, the inner surface of the long side wall 12, and the short side wall 13. The Specifically, two fixing ribs constituted by the case-side ribs 20 and 21 are applicable. The case side ribs 20 and 21 are arranged and formed with a predetermined interval.

  The case-side rib 20 is a fixing rib disposed on the inner side. For example, a wall continuous with the inner surface of the bottom wall 11 and the inner surface of the long side wall 12 is cut out in a U shape from the opening 14 side. It is formed in the shape as it was. The U-shaped bottom portion is formed in a semicircular arc portion that matches the diameter of the bellows recess 9 of the corrugated tube 5. The arc portion is formed as a portion that is inserted into and engaged with the bellows recess 9. On the other hand, the straight part from the opening 14 is formed as a part for guiding the corrugated tube 5 to the arc part. This straight guide portion is also inserted into the bellows recess 9.

  The case-side rib 20 is formed as a guide / fixing function portion 22 with respect to the corrugated tube 5 by cutting out the U-shaped portion. In addition to the guide / fixing function portion 22, the wall function portion 23 is formed continuously to the inner surface of the bottom wall 11 and the inner surface of the longitudinal side wall 12.

  On the other hand, the case-side rib 21 is a fixing rib disposed on the outside, and is formed in a shape in which the short side wall 13 is cut out in a U shape from the opening 14, that is, in the same shape as the case-side rib 20. Is done. The U-shaped bottom portion of the case side rib 21 is formed in a semicircular arc portion that matches the diameter of the bellows recess 9 of the corrugated tube 5. The arc portion is formed as a portion that is inserted into and engaged with the bellows recess 9. On the other hand, the straight part from the opening 14 is formed as a part for guiding the corrugated tube 5 to the arc part. This straight guide portion is also inserted into the bellows recess 9.

  The case-side rib 21 is also formed as a guide / fixing function portion 24 with respect to the corrugated tube 5 by cutting out the U-shaped portion. Further, except for the guide / fixed function portion 24, the wall function portion 25 is formed which exhibits the original function of the short side wall 13.

  Reference numeral 41 indicates a waterproof plug fixing portion. The waterproof plug fixing portion 41 is a portion for fixing the waterproof plug 51, and is disposed and formed between the case side ribs 20 and 21. The waterproof plug fixing portion 41 includes a pair of locking portions 42 arranged and formed on the inner surface of the longitudinal side wall 12 or in the vicinity thereof, a waterproof plug accommodation space 43, and an erroneous assembly prevention portion 44. In addition, the waterproof plug fixing portion 41 includes a pair of drain holes 45.

  A pair of latching | locking part 42 is formed as a part which can latch the waterproof plug 51 detachably. The pair of locking portions 42 are formed by projecting from the inner surface of the longitudinal side wall 12 or by bridging the case side ribs 20 and 21. In the present embodiment, the latter is adopted. The erroneous assembly preventing portion 44 is formed as a protruding portion that protrudes from the inner surface of the bottom wall 11 toward the opening 14. The misassembly prevention portion 44 is formed as a portion that can be noticed by an operator when the waterproof plug 51 is to be closed with the orientation of the waterproof plug 51 being changed, for example. The erroneous assembly preventing portion 44 is disposed and formed at a position slightly shifted from the center of the bottom wall 11.

  The pair of drain holes 45 is formed as a portion for preventing moisture from collecting between the waterproof plug 51 and the bottom wall 11. As the pair of drain holes 45, holes generated when the pair of locking portions 42 are punched are used. The pair of drain holes 45 is a portion that is generated along with the formation of the pair of locking portions 42, and is formed so as to penetrate the bottom wall 11.

  Returning to FIG. 1, the cover 8 has a cover body 26 that covers the opening 14 of the case 7 and a corrugated tube fixing portion 27 on the cover side, and is formed in the illustrated shape. The cover 7 is formed so that the corrugated tube fixing portion 27 is positioned at the wire lead-out portion 4 in the housing 3. The cover body 26 is formed with a plurality of cover side lock portions 28 for the case side lock portion 17 of the case 7.

  The corrugated tube fixing portion 27 is a portion for fixing the corrugated tube 5 on the cover 8 side, and is formed to be a wall-shaped rib. Specifically, the wall located outside the short side wall 13 of the case 7 is formed in a shape that is cut out into a semicircular arc portion at the tip of the wall. The arc portion is formed in accordance with the diameter of the bellows recess 9 of the corrugated tube 5. The arc portion is formed as a portion that is inserted into and engaged with the bellows recess 9. The corrugated tube fixing portion 27 has an arc portion formed as a fixing function portion with respect to the corrugated tube 5. Further, the portion other than the fixed function portion is formed as a wall function portion.

  In FIGS. 1 and 5, the waterproof plug 51 is formed as a member that is inserted into the waterproof plug fixing portion 41 of the case 7 and closes the wire lead-out portion 4. In this embodiment, it is formed by resin molding (not limited to resin, but may be made of rubber, for example). The waterproof plug 51 has a pair of locking projections 52, a rib engagement portion 53, and an incorrect assembly prevention portion 54 and is formed in the illustrated shape.

  The pair of locking projections 52 are portions that are detachably locked to the pair of locking portions 42 in the waterproof plug fixing portion 41 of the case 7, and have a substantially equilateral triangular cross section in the present embodiment. It is formed. The rib engaging portion 53 is a U-shaped protruding portion that is engaged with the outer case side rib 21 in the corrugated tube fixing portion 19 of the case 7 and is formed as a portion that closes the opening of the case side rib 21. The The erroneous assembly preventing portion 54 is formed in a stepped shape by the concave portion 55 and the convex portion 56. When the waterproof plug 51 is misassembled, the convex portion 56 abuts against the misassembly prevention portion 44 of the case 7, and when it is properly assembled, the convex portion 56 is formed on the inner surface of the bottom wall 11 of the case 7. At the same time, the concave portion 55 comes into contact with the erroneous assembly preventing portion 44 of the case 7.

  Note that the waterproof plug 51 is formed in a shape having a constant wall thickness in order to stabilize the shape after resin molding (to prevent sink marks) (see FIG. 7B. Reference numeral 57 denotes a reference numeral 57). Shows meat stealing part).

  Next, the waterproof housing structure 2 of the invention will be described based on the above configuration and structure.

  In FIG. 2, the corrugated tube 5 in a state where an electric wire (not shown) is inserted is assembled to the corrugated tube fixing portion 19 of the case 7. At this time, the corrugated tube 5 is fixed by the bellows recess 9 being guided by the case side ribs 20 and 21. In FIG. 2, only one corrugated tube 5 is assembled and one corrugated tube fixing portion 19 is opened. That is, this is a case where the wire lead-out portion 4 is not used.

  When the wire lead-out portion 4 is not used, the waterproof plug 51 is inserted into the waterproof plug fixing portion 41 between the case side ribs 20 and 21 in the corrugated tube fixing portion 19 so that the assembled state as shown in FIGS. To do.

  In FIG. 1B, after the corrugated tube 5 is assembled to the case 7 and further the waterproof plug 51 is assembled to the waterproof plug fixing portion 41, the cover 8 is assembled to the case 7 so as to cover the opening 14. At this time, in the corrugated tube 5, the bellows concave portion 9 is fixed by one corrugated tube fixing portion 27 of the cover 8. The waterproof plug 51 is also fixed by the other corrugated tube fixing portion 27. When these fixings are finished, a series of assembly is completed.

  As described above with reference to FIGS. 1 to 7, according to the present invention, the corrugated tube fixing portions 19 and 27 and the waterproof plug fixing portion 41 are formed in the wire lead-out portion 4 as the structure of the housing 3. Therefore, even if there is a wire lead portion 4 that is not used temporarily among the plurality of wire lead portions 4, the waterproof property can be secured by closing the unused wire lead portion 4 with the waterproof plug 51. Play.

  In addition, according to the present invention, not only is the wire lead-out portion 4 closed with the waterproof plug 51 but also the water drainage hole 45 is prevented from collecting water, so that the waterproof property can be enhanced.

  It goes without saying that the present invention can be variously modified without departing from the spirit of the present invention. For example, not only the terminal block 1 but also a broad electrical connection box may be used.

  DESCRIPTION OF SYMBOLS 1 ... Terminal block, 2 ... Case waterproof structure, 3 ... Housing, 4 ... Electric wire extraction part, 5 ... Corrugated tube, 7 ... Case, 8 ... Cover, 9 ... Bellows recessed part, 10 ... Bellows convex part, 11 ... Bottom Wall, 12 ... Long side wall, 13 ... Short side wall, 14 ... Opening, 15 ... Inner space, 16 ... End part, 17 ... Case side lock part, 18 ... Vehicle fixing part, 19 ... Corrugated tube fixing part, 20, 21 ... Case side ribs, 22, 24 ... Guiding / fixing functional parts, 23, 25 ... Wall functional parts, 26 ... Cover body, 27 ... Corrugated tube fixing part, 28 ... Cover side locking part, 41 ... Waterproof plug fixing part, 42 ··· Locking portion, 43 ··· Waterproof stopper housing space, 44 ··· Misassembly prevention portion, 45 ··· Drain hole, 51 ··· Waterproof stopper, 52 ··· Locking convex portion, 53 ··· Rib engagement portion, 54 ··· Prevention of incorrect assembly Stop part, 55 ... concave part, 56 ... convex part, 57 ... meat stealing part

Claims (2)

Providing a plurality of wire lead portions in a case including a case and a cover that covers the opening of the case ,
The said conductive lead-out portion,
A corrugated tube fixing part for fixing the corrugated tube through which the electric wire is inserted ;
A waterproof plug fixing portion for fixing a waterproof plug that closes the wire drawing portion when the electric wire is not pulled out ;
Form the
The corrugated tube fixing part is
A first rib formed inside the case and formed with a notch that can be engaged with the bellows recess of the corrugated tube;
A second rib which is opposed to the first rib at a predetermined interval and is formed on the outside of the case and has a notch that can be engaged with the corrugated recess of the corrugated tube;
Including
The waterproof plug fixing part is
Formed between the first rib and the second rib,
Further, the between the waterproof plug fixing portion and the case bottom wall in a by and said first rib and said second rib of the position of the wire lead-out portion with the formation of, forming a drain hole A waterproof structure for the housing. The waterproof housing structure according to claim 1,
The case waterproof structure, wherein the bottom wall is formed with a misassembly preventing portion as a portion for preventing misassembly with respect to the waterproof plug.

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