JP2017034871A - Electric connection box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric connection box in a novel structure capable of eliminating a gap to be generated between a lock part provided in an electric component mounting part and a locked part provided in an electric component after the lock part and the locked part are engaged.SOLUTION: In an electric connection box 10, on a sidewall 20 of an electric component mounting part 16, an elastic projection piece 26 is provided protrusively, and a lock part 28 provided in the elastic projection piece 26 is engaged to a locked part 30 provided on a peripheral wall of an electric component 18, such that the electric component 18 is prevented from being detached from the electric component mounting part 16. On a bottom wall 22 of the electric component mounting part 16, energizing parts 34 and 36 are provided for energizing the electric component 18 upwards and keeping the state where the lock part 28 of the elastic projection piece 26 is abutted to the locked part 30 of the electric component 18.SELECTED DRAWING: Figure 5

Description

  The present invention relates to an electrical junction box in which an internal circuit is disposed, and more particularly to an electrical junction box in which a component mounting portion for mounting an electrical component conducted to the internal circuit is provided on an outer surface of a case.

  2. Description of the Related Art Conventionally, as an electrical connection box mounted on an automobile or the like, an electrical connection box having an internal circuit and an electrical component mounting portion for mounting an electrical component such as a relay or a fuse conducting to the internal circuit is known. For example, those described in JP-A-9-35605 (Patent Document 1).

  By the way, such an electrical component is fitted and mounted in a predetermined electrical component mounting portion, and is held by a locking means so as not to come off from the electrical component mounting portion. For example, as shown in Patent Document 1, on the side wall of the relay mounting portion, there is an elastic projecting piece that protrudes toward the upper side of the case with a free end on both sides facing each other with the relay interposed therebetween. Is provided. At the tip of the elastic protrusion, a locking portion is formed that protrudes inside the relay mounting portion and can be locked to a protruding locking portion provided in the relay. When the relay is inserted, the locking portion comes into contact with the relay, and the elastic protruding piece bends to the outside of the relay mounting portion to allow the relay to be inserted. Then, when the relay is pushed further downward and the locking part gets over the locked part provided on the relay, the elastic protruding piece elastically returns to the inside of the relay mounting part so that the locking part becomes locked. Engage with. Thereby, a relay is hold | maintained in a desired fitting position, without removing | separating from a relay mounting part.

  However, in such a locking means, since the locking portion of the elastic protruding piece elastically deforms outward so as to be able to get over the locked portion, it is elastically restored and disposed above the locked portion. In the normal fitting position of the locking means, a gap is generated between the upper end portion of the locked portion and the lower end portion of the locking portion. Therefore, when vibration is applied when the vehicle is traveling, the relay vibrates in the vertical direction due to the gap, and the relay mounting condition becomes unstable, or the relay There was a possibility that abnormal noise would occur due to repeated contact with the wall.

Japanese Patent Laid-Open No. 9-35605

  The present invention has been made in the background of the circumstances as described above, and the problem to be solved is that after engaging the locking portion provided in the electrical component mounting portion and the locked portion provided in the electrical component, It is an object of the present invention to provide an electrical junction box having a novel structure that can eliminate a gap generated between the two.

  A first aspect of the present invention includes a case in which an internal circuit is disposed, and an electrical component mounting portion for mounting an electrical component that conducts to the internal circuit is disposed on the outer surface of the case. An elastic projecting piece projects from the side wall of the mounting portion, and the engaging portion provided on the elastic projecting piece engages with the engaged portion provided on the peripheral wall of the electrical component. In the electrical junction box designed to prevent the electrical component from being detached from the electrical component mounting portion, the electrical component is biased upward on the bottom wall of the electrical component mounting portion, An urging portion is provided to hold the locking portion of the elastic protrusion piece in contact with the previously locked portion of the electrical component.

  According to this aspect, the latching portion of the elastic protrusion provided on the electrical component mounting portion by urging the electrical component upward is applied to the bottom wall of the electrical component mounting portion against the locked portion of the electrical component. An urging portion for holding the contacted state is provided. As a result, when the electrical component is mounted on the electrical component mounting portion, the locking portion of the elastic protrusion provided on the side wall of the electrical component mounting portion abuts on the locked portion of the electrical component and bends outward. After that, the clearance generated between the locking portion and the locked portion can be eliminated when the locked portion is overcome and elastically recovered and disposed immediately above the locked portion. Therefore, it is possible to reduce or eliminate the risk that the electrical component will vibrate in the vertical direction due to such a gap, and to prevent the problem that the mounting state of the electrical component becomes unstable or abnormal noise is generated. can do.

  In addition, as a biasing portion that biases the electrical component upward, for example, after allowing the locking portion to move over the locked portion, it is necessary to fill a gap between them, and thus has a spring property. Arbitrary structures such as a structure in which a coil spring is arranged on the bottom wall of the electrical component mounting part or a structure in which a bending piece protruding upward in an arc shape from the bottom wall of the electrical component mounting part is adopted. Is possible.

  A second aspect of the present invention is the one described in the first aspect, wherein a bending piece having both ends connected to the bottom wall is configured between a pair of slits formed in the bottom wall. When the entire bottom surface of the electrical component is brought into contact with the bottom wall of the electrical component mounting portion, the locking portion of the elastic protrusion and the locked portion of the electrical component in the mounting direction of the electrical component A protrusion protruding at a height larger than a gap dimension generated between the protrusions is provided at the center of the bending piece, and the biasing part is configured by cooperation of the bending piece and the protrusion. .

  According to this aspect, when the entire bottom surface of the electric component is brought into contact with the bottom wall of the electric component mounting portion at the center portion of the bending piece, the locked portion of the electric component and the electric component in the mounting direction of the electric component Since there is a protrusion that protrudes with a height that is greater than the gap dimension that occurs between the locking parts of the mounting part, when the electrical part is pushed into the electrical part mounting part from above, the protrusion of the flexure piece becomes the electrical part. The flexure piece is pressed and deformed downward while abutting against the bottom surface. As a result, the locking portion is allowed to get over the locked portion, and an engagement state in which the locking portion is disposed immediately above the locked portion is realized. Then, after the locking portion is elastically restored, the electric component is biased upward by the elastic restoring force of the bending piece, and the locking portion and the locked portion are held in contact. In this way, the urging portion can be configured without requiring separate parts by a simple structure in which the slit and the protrusion are provided on the bottom wall.

  A third aspect of the present invention is the one described in the first aspect, wherein the bottom wall is thinned so as to be able to bend and deform, while a height larger than the gap dimension is provided at the center of the bottom wall. A projecting portion that projects in size is provided, and the urging portion is configured by the cooperation of the thin bottom wall and the projecting portion.

  According to this aspect, the protruding portion that protrudes with a height dimension larger than the clearance dimension between the locked portion of the electrical component and the locking portion of the electrical component mounting portion is provided in the center portion of the bottom wall that is thin. It has been. Accordingly, the bottom wall can be bent and deformed in the vertical direction, and when the electrical component is pushed into the electrical component mounting portion from above, the protrusion comes into contact with the bottom surface of the electrical component and the bottom wall is pressed and deformed downward. . As a result, the locking portion is allowed to get over the locked portion, and an engagement state in which the locking portion is disposed immediately above the locked portion is realized. Then, after the locking portion is elastically restored, the electrical component is biased upward by the elastic restoring force of the bottom wall, and the locking portion and the locked portion are held in contact. In this manner, the urging portion can be configured without requiring a separate part by a simple structure in which the protrusion is provided at the center portion of the thinned bottom wall.

  According to the present invention, the latching portion of the elastic protrusion provided on the electrical component mounting portion by urging the electrical component upward is applied to the bottom wall of the electrical component mounting portion against the locked portion of the electrical component. An urging portion for holding the contacted state is provided. Thereby, when mounting | wearing an electrical component to an electrical component mounting part, the clearance gap produced between a latching | locking part and a to-be-latched part can be lose | disappeared. Therefore, it is possible to reduce or eliminate the risk that the electrical component will vibrate in the vertical direction due to such a gap, and to prevent the problem that the mounting state of the electrical component becomes unstable or abnormal noise is generated. can do.

The disassembled perspective view which shows the electrical-connection box as one Embodiment of this invention. The perspective view of the assembly | attachment state of the electrical-connection box shown in FIG. The top view of the case shown in FIG. The top view of the electrical-connection box shown in FIG. The principal part enlarged view of the VV cross section in FIG. It is a top view which shows the other aspect of the electrical component mounting part of the case which comprises the electrical junction box of this invention, Comprising: The figure corresponding to FIG. It is a top view of the state which assembled | attached the electrical component to the electrical component mounting part of the case shown in FIG. 6, Comprising: The figure corresponding to FIG. The principal part enlarged view of the VIII-VIII cross section in FIG. It is a cross-sectional enlarged view of the electrical component mounting part in the conventional electrical junction box, Comprising: The figure corresponding to FIG.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 to 5 show an electrical junction box 10 as one embodiment of the present invention. The electrical junction box 10 includes a case 12 in which an internal circuit (not shown) is disposed. The case 12 is integrally formed by injection molding or the like with a synthetic resin such as polypropylene (PP) or polyamide (PA). Further, in the following description, “upper” means the upper side in FIG. 1, and “lower” means the lower side in FIG.

  As shown in FIGS. 1 and 2, the case 12 has a substantially rectangular block shape as a whole. A high voltage relay mounting portion 16, which is an electrical component mounting portion, is disposed at a substantially central portion of the outer surface 14 of the case 12. The high voltage relay mounting unit 16 is mounted with a high voltage relay 18 that is an electrical component for high voltage. More specifically, the high-voltage relay mounting portion 16 is formed by a substantially square-shaped side wall 20 protruding upward from the outer surface 14 of the case 12 and the outer surface 14 of the case 12 surrounded by the side wall 20. The bottom wall 22 is configured. Of the side walls 20a to 20d constituting the side wall 20, the central portions of the side walls 20a and 20c facing the length direction of the case 12 (left and right direction in FIG. 3) are each substantially rectangular in front view opening in the vertical direction. A cutout portion 24 having a shape is formed, and an elastic projection piece 26 having a substantially rectangular frame shape is projected upward from the bottom wall 22 in the cutout portion 24 in a front view. Further, an engagement hole 28 that is a locking portion is provided in the thickness direction on the distal end side that is the free end of the elastic projection piece 26, and the high-voltage relay 18 faces the engagement hole 28. By engaging the lock portion 30, which is a locked portion having a substantially triangular cross-section, protruding from the peripheral wall from above, the high voltage relay 18 is fixed to the high voltage relay mounting portion 16, and the high voltage relay 18 has a high voltage. Detachment from the relay mounting portion 16 is prevented.

  On the other hand, a pair of slits 32, 32 extending in the length direction (left and right direction in FIG. 3) are provided on both sides of the bottom wall 22 of the high voltage relay mounting portion 16 in the width direction (up and down direction in FIG. 3). In addition, a bent piece 34 is formed between the pair of slits 32, 32, both ends of which are connected to the bottom wall 22 and can be bent and deformed in the thickness direction. In addition, a protrusion 36 that protrudes upward in a substantially semicircular cross-sectional shape is provided at the center in the length direction of the bending piece 34. The height dimension H1 (see FIG. 5) of the projection 36 is such that the entire bottom surface 38 of the high voltage relay 18 is brought into contact with the bottom wall 22 of the high voltage relay mounting portion 16, that is, the high voltage of the electrical connection box 2 having a conventional structure. When the high voltage relay 18 is placed on the bottom wall 6 of the relay mounting part 4, the engagement hole between the lock part 30 of the high voltage relay 18 and the high voltage relay mounting part 4 in the mounting direction of the high voltage relay 18 (vertical direction in FIG. 9). 28 is formed so as to be larger than the dimension 8 of the gap 8 generated between the layers 28 (see FIG. 9). As shown in FIG. 3, in plan view, the two protrusions 36 provided in the two pairs of slits 32 of the bottom wall 22 are arranged so that the center of gravity of the high-voltage relay 18 is located between them. It is installed. Further, a pair of high-voltage relay terminal insertion holes 40 and 40 are provided in the center portion of the bottom wall 22 of the high-voltage relay mounting portion 16, and the terminals of the high-voltage relay 18 are inserted, so It is designed to be connected to the circuit.

  Next, details of mounting the high-voltage relay 18 on the high-voltage relay mounting portion 16 will be described. First, the high voltage relay 18 is inserted into the high voltage relay mounting part 16 from above. As shown in FIG. 5, since the lower end surface 42 of the lock portion 30 of the high voltage relay 18 is a tapered inclined surface, the lower end surface 42 of the lock portion 30 of the high voltage relay 18 is the high voltage relay mounting portion. By pushing further downward from the state of contact with the tip of the elastic projection piece 26, the distal end side of the elastic projection piece 26 which is the free end of the elastic projection piece 26 is outside the high-voltage relay mounting portion 16 by the action of the tapered inclined surface. The high-voltage relay 18 is allowed to be inserted into the back of the high-voltage relay mounting portion 16. When the high voltage relay 18 is further pushed into the depth of the high voltage relay mounting portion 16 and the lock portion 30 of the high voltage relay 18 exceeds the upper end surface of the engagement hole 28 of the elastic protrusion 26, the elastic protrusion 26 is elastic. After returning, the lock portion 30 of the high-voltage relay 18 is inserted into the engagement hole 28 of the elastic protrusion 26. As a result, the lock portion 30 of the high-voltage relay 18 is engaged with the engagement hole 28 of the elastic protruding piece 26 so that the high-voltage relay 18 is held against the high-voltage relay mounting portion 16. In this state, a gap 8 is generated between the lock portion 30 and the engagement hole 28 of the high-voltage relay 18 (see FIG. 9), as in the electrical junction box 2 of the conventional structure (see FIG. 9). A bent piece 34 is formed on the bottom wall 22 of 16 and has a protrusion 36 protruding in a height dimension larger than the dimension of the gap 8 and can be bent and deformed in the thickness direction. Therefore, the high pressure relay 18 is urged upward by the cooperation of the bending piece 34 and the protrusion 36, and the lock portion 30 of the high voltage relay 18 is held in contact with the engagement hole 28 of the elastic protrusion 26. In other words, the gap 8 between the lock portion 30 of the high-voltage relay 18 and the engagement hole 28 can be eliminated. In short, the urging portion that urges the high-voltage relay 18 upward and holds the lock portion 30 in contact with the engagement hole 28 is configured by the cooperation of the bending piece 34 and the protrusion 36. .

  According to the electrical junction box 10 of the present embodiment having such a structure, the biasing portion that biases the high-voltage relay 18 upward and holds the lock portion 30 in contact with the engagement hole 28 is provided. This is configured by the cooperation of the bending piece 34 and the projection 36 in the bottom wall 22 of the high voltage relay mounting portion 16. Thereby, the engagement between the high voltage relay mounting part 16 and the high voltage relay 18 is constituted by the engagement hole 28 of the elastic protrusion 26 of the high voltage relay mounting part 16 and the lock part 30 of the high voltage relay 18. In addition, the gap 8 that has been generated between the engagement hole 28 and the lock portion 30 can be eliminated. Therefore, the risk that the high-voltage relay 18 vibrates in the vertical direction due to the gap 8 can be reduced or eliminated, and the mounting state of the high-voltage relay 18 becomes unstable or abnormal noise is generated. It can be prevented in advance. In addition, the urging portion can be configured without requiring separate parts by a simple structure in which the bending piece 34 and the protrusion 36 are provided on the bottom wall 22 of the high voltage relay mounting portion 16. In addition, since the two protrusions 36 provided in the two pairs of slits 32 of the bottom wall 22 are arranged so that the center of gravity of the high-voltage relay 18 is positioned between them in a plan view, the high-voltage relay 18 can be stably held by the two protrusions 36.

  Next, other aspects of the high voltage relay mounting portion 16 of the above embodiment will be described in detail with reference to FIGS. 6 to 8, but members and parts having the same structure as the above embodiment are shown in the drawings. By attaching the same reference numerals as those in the above embodiment, detailed description thereof will be omitted. In the high voltage relay mounting portion 44 of the present embodiment, the bottom wall 46 is thinned so as to be able to bend and deform, and a height dimension H2 larger than the dimension 8 of the gap 8 at the center portion of the bottom wall 46 (FIG. 8). The projecting portion 48 projecting in FIG. 6 is provided, and an urging portion is configured by the cooperation of the thin bottom wall 46 and the projecting portion 48, showing an embodiment different from the above embodiment. .

  More specifically, the bottom wall 46 is thin with a thickness dimension: t that can be bent and deformed in the vertical direction, while the side wall 20 has a thickness dimension: T that requires rigidity to stably hold the high-voltage relay 18. It is thick (see FIG. 8). Therefore, when the high-voltage relay 18 is pushed into the high-voltage relay mounting portion 44 from above, the protruding portion 48 protruding from the thin wall 46 contacts the bottom surface 38 of the high-voltage relay 18 and the thin wall 46 is lowered. Is pressed and deformed. Thereby, the lock portion 30 is allowed to get over the tip end portion of the elastic projection piece 26, and the engagement state between the lock portion 30 of the high voltage relay 18 and the engagement hole 28 of the elastic projection piece 26 is realized. In this engaged state, the high voltage relay 18 is biased upward by the elastic restoring force of the bottom wall 46, so that the lock portion 30 of the high voltage relay 18 and the engagement hole 28 of the elastic protrusion 26 are held in contact. Is done. As described above, also in the present embodiment, the urging portion can be configured without requiring a separate part due to the simple structure in which the protrusion 48 is provided at the center of the thin bottom wall 46.

  As mentioned above, although embodiment of this invention was explained in full detail, this invention is not limited by the specific description. For example, in addition to the structure illustrated in the above embodiment, the structure of the urging unit includes a structure in which a coil spring or the like is disposed, and the high-voltage relay 18 is urged upward to lock the lock 30 and the elastic protrusion 26 of the high-voltage relay 18. Any structure that holds the engagement hole 28 in a contact state can be employed. Further, the engagement between the high-voltage relay 18 and the high-voltage relay mounting portion 44 is not limited to that by the illustrated engagement hole 28 and the lock portion 30, and any structure can be adopted. Further, in the above embodiment, two pairs of slits 32 are provided on the bottom wall 22 and the urging portions are formed by the bending pieces 34 and the projections 36 respectively. However, the slits 32 may be provided in pairs or in three or more pairs. Good. In addition, in another aspect of the above-described embodiment, a plurality of protrusions 48 may be provided on the bottom wall 46. In addition, by arranging the plurality of protrusions 48 evenly around the center of gravity of the high-voltage relay 18, the high-voltage relay 18 can be stably held by the plurality of protrusions 48.

10: Electrical connection box, 12: Case, 14: Outer surface, 16, 44: High voltage relay mounting part (electric part mounting part), 18: High voltage relay (electric part), 20, 20a-d: Side wall, 22: Bottom wall , 26: elastic protrusion, 28: engagement hole (locking portion), 30: lock portion (locked portion), 32: slit, 34: bending piece (biasing portion), 36: protrusion (biasing portion) ), 38: bottom surface, 46: bottom wall (biasing portion), 48: protrusion (biasing portion)

Claims (3)

An electrical component mounting portion for mounting an electrical component that conducts to the internal circuit is disposed on the outer surface of the case.
An elastic protrusion is provided on the side wall of the electrical component mounting portion, and the locking portion provided on the elastic protrusion is engaged with the locked portion provided on the peripheral wall of the electrical component. By doing so, in the electrical junction box adapted to prevent the electrical component from being detached from the electrical component mounting portion,
On the bottom wall of the electrical component mounting portion, the electrical component is urged upward, and the locking portion of the elastic protrusion is held in contact with the previously locked portion of the electrical component. An electrical connection box characterized in that an urging portion is provided.   A bending piece having both ends connected to the bottom wall is configured between a pair of slits formed in the bottom wall, and the entire bottom surface of the electrical component is brought into contact with the bottom wall of the electrical component mounting portion. A protrusion projecting at a height larger than the gap formed between the locking portion of the elastic protruding piece and the locked portion of the electric component in the mounting direction of the electric component. The electrical junction box according to claim 1, wherein the electrical connection box is provided at a central portion, and the urging portion is configured by cooperation of the bending piece and the protrusion.   While the bottom wall is thin so as to be able to bend and deform, a projection that protrudes at a height larger than the gap is provided at the center of the bottom wall, and the thin bottom wall and the projection The electrical connection box according to claim 1, wherein the urging portion is configured by cooperation of the portions.

Images