JP4697797B2 - Fuse mounting structure - Google Patents

Description

  The present invention relates to a fuse mounting structure for mounting a fuse to a fuse box.

  As a conventional fuse mounting structure, the structure shown in FIG. 8 is known (see, for example, Patent Document 1).

  In the fuse mounting structure disclosed in Patent Document 1, the fuse 101 is mounted on the fuse holder 102 as shown in FIG. And this fuse holder 102 is assembled | attached to the fuse block main body 105 which accommodated the other party terminal 104 to which the tab terminal 103 of the fuse 101 is connected.

  The fuse holder 102 is formed in a rectangular cylindrical shape, and a pair of elastic locking arms 111 for locking the upper surface of the inserted fuse 101 is provided inside thereof. The elastic locking arm 101 extends in the vertical direction, and its lower end is connected to the inner surface of the peripheral wall of the fuse holder 102. A locking projection 113 for locking the upper surface of the fuse 101 is provided at the upper end of the elastic locking arm 111 exposed in the upper opening 112 of the fuse holder 102. The locking surface 113a of the locking projection 113 that contacts the upper surface of the fuse is a horizontal surface.

  The fuse 101 is inserted between the pair of elastic locking arms 111 from the upper opening 112 of the fuse holder 102. The fuse 101 slides into contact with the locking projection 113 and enters between the pair of elastic locking arms 111 while bending the elastic locking arms 111 outward, and the upper surface of the fuse 101 is returned to the elastic locking. It is locked to the locking protrusion 113 of the arm 111, and is thereby attached to the fuse holder 102.

JP 07-169382 A

  In the fuse mounting structure disclosed in Patent Document 1, the fuse 101 is inserted between the pair of elastic locking arms 111 only from above through the upper opening 112 of the fuse holder 102. Here, in recent years, due to demands for miniaturization of fuse boxes, fuses attached to fuse boxes have also been miniaturized, and generally flat and thin ones with a small thickness are used. The upper opening of the part is also narrow (the dimension in the direction corresponding to the thickness direction of the fuse is small). Therefore, it has become difficult to insert the fuse into the upper opening of the fuse mounting portion, and there is a concern that the workability of the fuse mounting work may be reduced.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuse mounting structure that is excellent in workability of fuse mounting work and excellent in holding power of the fuse after mounting.

  The above object is achieved by the following (1) to (3) fuse mounting structure according to the present invention.

(1) a fuse in which a fusible portion is installed between upper ends of a pair of terminal portions that are parallel to each other, and at least the upper end portions of the pair of terminal portions and the fusible portion are covered with an insulating housing;
A fuse box including a fuse mounting portion to which the fuse is mounted;
With
A pair of elastic locking arms, the fuse mounting portions facing each other so as to sandwich the fuse in the width direction and locking the upper surface of the housing of the fuse, the pair of elastic locking arms, and the pair of elastic engagements A frame surrounding the outer periphery of the fuse locked to the stop arm,
A notch reaching the upper edge of the frame is formed at a position facing the pair of elastic locking arms in the frame, and the width direction dimension of the notch is larger than the width direction dimension of the fuse. Is set,
Fuse mounting, wherein the fuse is inclined and inserted between the pair of elastic locking arms through the notch of the frame, and is locked to the pair of elastic locking arms by being raised Construction.

(2) The locking surface of the elastic locking arm that locks the upper surface of the housing of the fuse is an inclined surface,
When the fuse is inclined and inserted between the pair of elastic locking arms, a side edge of the fuse is in sliding contact with the locking surfaces of the pair of elastic locking arms. The fuse mounting structure described in (1) above.

(3) The housing covers an upper end portion and a soluble portion of the pair of terminal portions and an inner edge portion of the pair of terminal portions,
The rib according to (1) or (2), wherein a rib is formed in a region below the notch in the frame so as to contact a portion of the housing that covers an inner edge of the pair of terminal portions. Fuse mounting structure.

  In the fuse mounting structure of the present invention, the frame surrounding the pair of elastic locking arms and the fuse whose upper surface of the housing is locked to the pair of elastic locking arms is cut at a position facing the pair of elastic locking arms. A notch is formed, and the dimension in the width direction of the notch is set to be larger than the dimension in the width direction of the fuse. Therefore, the fuse can be inserted between the pair of elastic locking arms via the notch, and the fuse attached to the fuse box is flat, and the upper opening of the frame is narrowly formed correspondingly. Even in this case, the fuse can be efficiently inserted between the pair of elastic locking arms, and the workability of the fuse mounting operation can be improved.

  In the fuse mounting structure according to the present invention, when the fuse inserted at an angle between the pair of elastic locking arms is raised, the elastic locking arms of the side edges of the fuse that lock the upper surface of the fuse housing are provided. Although it is in sliding contact with the locking surface, this locking surface is an inclined surface. Therefore, the elastic locking arm can be flexed smoothly in sliding contact with the side edge of the fuse, and the workability of the fuse mounting operation can be further improved.

  Furthermore, in the fuse mounting structure according to the present invention, a rib is provided in a region below the notch in the frame, and this rib comes into contact with the portion of the housing that covers the inner edges of the pair of terminal portions. It is possible to fill a gap between the frame set for inserting the fuse and the fuse. As a result, the fuse can be held firmly and the inclination and rattling of the fuse can be prevented.

Hereinafter, preferred embodiments of a connector according to the present invention will be described with reference to the drawings.
1 is an external perspective view of a fuse box according to an embodiment of a fuse mounting structure of the present invention, FIG. 2 is an enlarged perspective view of a fuse mounting portion surrounded by a dotted circle II in FIG. 1, and FIG. 4 is an exploded perspective view of the fuse attached to the fuse box, FIG. 4 is a front view of the fuse of FIG. 3, FIGS. 5 and 6 are cross-sectional views showing the process of attaching the fuse to the fuse attachment portion, and FIG. FIG.

  As shown in FIGS. 1 and 2, the fuse box 1 is made of, for example, a synthetic resin and is formed in a box shape, and a fuse mounting portion 2 to which a fuse (see FIG. 3) is mounted is included in the fuse box 1. In addition, a relay attachment portion 3 and the like to which a relay (not shown) is attached are partitioned.

  As shown in FIG. 3, the fuse 20 to be mounted on the fuse mounting portion 2 of the fuse box is a fuse in which a fusible portion 22 is installed between the upper ends of a pair of flat plate terminal portions 21 and 21 arranged in parallel to each other. This is a blade-type fuse in which the element 25 is assembled in the insulating housing 23. Each of the flat terminal portions 21 has a substantially rectangular plate shape, and the fusible portion 22 has a predetermined cross-sectional area so as to be laid between the opposing inner edges 21a and 21a of the flat terminal portions 21 and 21. It is provided with.

  The insulating housing 23 includes a pair of housing members 24 and 24 having a substantially T shape, and is integrally coupled so as to sandwich the fuse element 25 from the thickness direction. A pair of large and small pins 24a and 24a are projected from the inner wall surface of each housing member 24, and each pin 24a faces each other after passing through a through hole 21b provided in each flat plate terminal portion 21. The housing member 24 is fitted into a fitting hole 24b formed in the inner wall surface. Accordingly, the fusible portion 22 of the fuse element 25, the upper end portion 21c of each flat plate terminal portion 21, and the inner edge portion 21a of each flat plate terminal portion 21 are covered with the insulating housing 23.

  Therefore, as shown in FIG. 4, the fuse 20 exposes the front and back surface regions 21 f from the lower end 21 e of the outer edge portion 21 d of each flat terminal portion 21 to the intermediate portion located on the side of the fusible portion 22. The front and back regions 21f are sandwiched in the thickness direction by a mating terminal 9 (see FIGS. 5 and 6) provided in the fuse mounting portion 2 described later, and are electrically connected to the mating terminal 9. The fuse 20 having such a configuration is thin and thin.

  As shown in FIG. 2, the fuse mounting portion 2 of the fuse box 1 to which the fuse 20 is mounted is arranged so as to be opposed to sandwich the fuse 20 in the width direction, and engages the upper surface of the housing 23 of the fuse 20. And a pair of elastic locking arms, and a frame 5 having a substantially rectangular shape in plan view surrounding the outer periphery of the fuse locked by the pair of elastic locking arms. .

  The elastic locking arm 4 extends in the vertical direction within the frame 5, and its lower end is connected to the inner surface of the frame 5. The elastic locking arm 4 has a bending space between the inner surface of the frame 5, extends upward from the lower end portion connected to the inner surface of the frame 5, and the upper end portion is exposed to the upper opening of the frame 5. I am letting. The upper end of the elastic locking arm 4 is provided with a locking projection 6 that protrudes toward the opposing elastic locking arm 4 as a pair.

  The fuse 20 is bent to the outside of each elastic locking arm 4 so that the upper end portion of each elastic locking arm 4 is retracted into a bending space between the elastic locking arm 4 and the inner surface of the frame 5. It is inserted between the pair of elastic locking arms 4, and the edge in the width direction on the upper surface of the housing 23 is locked by the locking projection 6, thereby being attached to the fuse box 1. Note that the lower surface (locking surface) 6 a of the locking projection 6 that locks the upper surface of the housing 23 has a gentle downward slope from the protruding end of the locking projection 6 toward the base end connected to the elastic locking arm 4. It is assumed to be an inclined surface.

  A cutout 7 reaching the upper edge of the frame 5 is formed in the frame 5 of the fuse mounting portion 2 at a location facing the pair of elastic locking arms 4. The width dimension W of the notch 7 is set to be larger than the width dimension of the fuse 20. Therefore, the fuse 20 can be inserted between the pair of elastic locking arms 4 not only through the upper opening of the frame 5 but also through the notch 7.

  Therefore, as shown in FIG. 5, the fuse 20 is inserted between the pair of elastic locking arms 4 through the notch 7 in an inclined state in which the lower ends 21 e of the pair of flat plate terminal portions 21 are inclined obliquely downward. In the process of being raised vertically from this state, the exposed outer edges of the pair of flat plate terminal portions 21 of the fuse 20 or the side edges of the housing 23 are in sliding contact with the lower surface 6a of the locking projection 6, and each elastic locking arm 4 is moved. Bend outward. Since the lower surface 6a of the locking projection 6 is inclined as described above, it can be smoothly slid in contact with the exposed outer edge of the pair of flat plate terminal portions 21 of the fuse 20 or the side edge of the housing 23. The elastic locking arm 4 can be bent outward.

  Then, as shown in FIG. 6, the fuse 20 is pushed down from the vertically raised state, and the edge in the width direction on the upper surface of the housing 23 is moved to the locking protrusion 6 of the elastic locking arm 4 that has returned from the bending. It is locked and thus attached to the fuse box 1. A tuning fork-type mating terminal 9 is installed at the bottom of the frame 5 of the fuse mounting portion 2, and when the fuse 20 is pushed down, the front and back surface regions 21 f of the flat-plate terminal portions 21 are formed on the mating terminal 9. It enters the slit 9a and is sandwiched in the thickness direction, and is electrically connected to the mating terminal 9.

  As described above, when the fuse 20 is attached to the fuse box 1, the notch 7 is formed in the frame 5, so that the upper part is not supported in the thickness direction, and the fuse 20 is inserted into the frame 5. As shown in FIG. 7, there is a possibility of tilting or rattling due to the gap between the frame 5 and the fuse 20 set for the purpose. Therefore, as shown in FIGS. 2 and 6, ribs 8 are formed in the region below the notch 7 in the frame 5 so as to protrude into the frame 5.

  The rib 8 extends in the vertical direction parallel to the insertion direction of the fuse 20 into the frame 5, fills a gap set between the frame 5 and the fuse 20, and a pair of flat plate terminals of the fuse 20. The fuse 20 is firmly held by contacting the portion 24c of the housing 23 that covers the inner edge of the portion 21.

  In addition, this invention is not limited to each embodiment mentioned above, In the range which does not deviate from the summary of this invention, it can change suitably. In addition, the material, shape, dimension, numerical value, form, number, arrangement location, and the like of each component in the above-described embodiment are arbitrary and are not limited as long as the present invention can be achieved.

1 is an external perspective view of a fuse box according to an embodiment of a fuse mounting structure of the present invention. FIG. 2 is an enlarged perspective view of a fuse mounting portion surrounded by a dotted circle II in FIG. 1. It is a disassembled perspective view of the fuse attached to the fuse box of FIG. FIG. 4 is a front view of the fuse of FIG. 3. It is sectional drawing which shows the process in which a fuse is attached to a fuse attachment part. It is sectional drawing which shows the process in which a fuse is attached to a fuse attachment part. It is sectional drawing which shows the state in which the fuse was inclined and attached. It is a top view of the conventional fuse mounting structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuse box 2 Fuse mounting part 4 Elastic locking arm 5 Frame 6a Locking surface 7 Notch 8 Rib 20 Fuse 21 Terminal part 22 Soluble part 23 Housing

Claims (3)

A fuse in which a fusible portion is installed between upper ends of a pair of terminal portions that are parallel to each other, and at least the upper end portions of the pair of terminal portions and the fusible portion are covered with an insulating housing;
A fuse box including a fuse mounting portion to which the fuse is mounted;
With
A pair of elastic locking arms, the fuse mounting portions facing each other so as to sandwich the fuse in the width direction and locking the upper surface of the housing of the fuse, the pair of elastic locking arms, and the pair of elastic engagements A frame surrounding the outer periphery of the fuse locked to the stop arm,
A notch reaching the upper edge of the frame is formed at a position facing the pair of elastic locking arms in the frame, and the width direction dimension of the notch is larger than the width direction dimension of the fuse. Is set,
Fuse mounting, wherein the fuse is inclined and inserted between the pair of elastic locking arms through the notch of the frame, and is locked to the pair of elastic locking arms by being raised Construction. The locking surface of the elastic locking arm that locks the upper surface of the housing of the fuse is an inclined surface,
When the fuse is inclined and inserted between the pair of elastic locking arms, a side edge of the fuse is in sliding contact with the locking surfaces of the pair of elastic locking arms. The fuse mounting structure according to claim 1. The housing covers an upper end portion and a soluble portion of the pair of terminal portions and an inner edge portion of the pair of terminal portions;
The rib which contacts the part of the said housing which covers the inner edge part of the said pair of terminal part is formed in the area | region below the said notch in the said frame, The Claim 1 or Claim 2 characterized by the above-mentioned. Fuse mounting structure.

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