JP2001057143A - Fuse unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuse unit allowing a fuse to be replaced easily. SOLUTION: In this fuse unit 10, a fuse 11 is held firmly by a holder 12 by screwing a male screw part 21 formed on the outside peripheral surface of the fuse 11 into a female screw part 22 formed on the inside peripheral surface of the holder 12, and thus a conductive connections of respective terminals 13, 14 of the fuse 11 to respective connection parts 16, 17 of the holder 12 are implemented. For the fuse unit 10, the mounting and dismounting of the fuse 11 can be carried out by turning the fuse 11 to carry out the screwing and unscrewing between the screw parts 21, 22 and to directly fit and remove the fuse 11 to/from the holder 12, and the need to use another component is obviated. Therefore, the fuse unit 10 allows the fuse 11 to be replaced easily.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuse unit for mounting a fuse.

[0002]

2. Description of the Related Art FIG. 5 shows an example of a conventional fuse unit provided in a power line of an electric vehicle, for example. The fuse unit 1 includes bolts 6, 6 standing from both ends of the fuse holder 3, and fuses 2.
The fuses 2 are fixed to the fuse holder 3 by penetrating the terminals 5, 5 provided at both ends of the fuse holder 3 and tightening the nuts 4, 4 from above.

[0003]

When replacing the fuse 2 in the fuse unit 1 described above, the two nuts 4 and 4 are removed, the fuse 2 is replaced with a new one, and the two nuts 4 and 4 are again replaced. In particular, in a narrow space such as the inside of an electric vehicle, it is very difficult to replace the fuse. Therefore, there has been a demand for the development of a fuse unit that can easily perform a fuse replacement operation. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuse unit capable of easily replacing a fuse.

[0004]

According to one aspect of the present invention, there is provided a fuse, a fuse holder for holding a fuse, and a fuse and a fuse holder. A screw portion that is screwed together by being rotated relative to the screw holder and a fuse holder. When the fuse reaches an end position of the screwing, it is conductively connected to a pair of terminals provided on the fuse. It is characterized by having a pair of terminal connection portions.

The invention according to claim 2 comprises a fuse and a fuse holder for holding the fuse. When the fuse is held in the fuse holder, a pair of terminals provided in the fuse and a pair of terminals provided in the fuse holder. In the fuse unit in which the terminal connection portion is conductively connected, the fuse is formed in an axial shape, while the fuse holder is
The fuse is formed in a cylindrical shape that can be fitted inside, and the fuse and the fuse holder are held in a mutually fitted state by screwing of the screw portions formed on the peripheral surface of the fuse and the fuse holder. In addition, the terminal and the terminal connection portion are characterized in that they are arranged so as to be electrically connected to each other when the fuse reaches the end position of the screwing to the fuse holder.

According to a third aspect of the present invention, in the fuse unit according to the second aspect, one of the terminals is disposed on a front end surface of the fuse in the fitting direction, and the other end is abutted against the front end surface of the fuse in the fuse holder. One terminal connection portion is arranged on the back wall provided so that the other terminal and the other terminal connection portion are respectively provided on portions of the peripheral surface of the fuse and the fuse holder where the fuses face each other at the terminal position. Is characterized by the arrangement of.

According to a fourth aspect of the present invention, in the fuse unit according to the second or third aspect, a handle portion for screwing the fuse is provided on a rear end face of the fuse in the fitting direction. It is characterized by where it is.

[0008]

<Functions and Effects of the Invention><Inventions of Claims 1 and 2> In the inventions of Claims 1 and 2, the fuse itself is provided with a screw portion, which is screwed directly to the fuse holder and attached. Because of the configuration, the replacement work of the fuse is simplified as compared with the conventional one, and the fuse can be easily replaced. Moreover, according to the second aspect of the present invention, the fuse holder has a cylindrical shape, and can protect the fuse housed inside the fuse holder.

According to the third aspect of the present invention, when the fuse is screwed into the fuse holder, one of the terminals disposed on the front end surface of the fuse and the rear wall of the fuse holder are disposed. The one terminal connection portion is electrically connected to the other terminal connection portion disposed on the peripheral surface of the fuse and the other terminal connection portion disposed on the peripheral surface of the fuse holder.

According to the invention of claim 4, since the handle is provided on the fuse, the fuse can be screwed into the fuse holder by operating the handle without using a tool. As a result, the replacement work of the fuse is further facilitated.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A fuse unit according to one embodiment of the present invention will be described below with reference to FIGS. The fuse 11 of the fuse unit 10 of the present embodiment is shown in FIG. 1, and the known fuse 2 (hereinafter, referred to as “general-purpose fuse 2” for convenience) described in the related art is, for example, a synthetic resin housing. 30 covered. This general-purpose fuse 2 has projecting piece-shaped terminals 5 and 5 protruding from both ends of a cylindrical main body 2A.
Each terminal 5 has a hole 5A through which a bolt is inserted. In the present embodiment, the pin 14A is press-fitted into the hole 5A of one terminal 5 of the general-purpose fuse 2 and
The tip of 4A is made to protrude upward from the outer peripheral surface of the main body 2A of the general-purpose fuse 2 in FIG. Then, the general-purpose fuse 2 is inserted into a resin molding die, and the periphery thereof is covered with a synthetic resin, whereby the synthetic resin housing 30 is formed.

The housing 30 has a shape provided with a handle portion 23 on the rear end surface of the cylindrical portion 18 covering the general-purpose fuse 2. The handle portion 23 has a T-shape as a whole, and is formed such that the central axis of the T-shape is aligned with the axial center of the cylindrical portion 18. The tip of the pin 14A pressed into one terminal 5 of the general-purpose fuse 2 is exposed from a position near the rear end of the cylindrical portion 18 of the housing 30, and a hemispherical portion formed at the tip of the pin 14A is exposed. Thereby, a rear terminal 14 (corresponding to a “terminal” of the present invention) of the fuse 11 of the present embodiment is configured. The distal end of the other terminal 5 provided in the general-purpose fuse 2 is exposed at the distal end surface of the cylindrical portion 18 of the housing 30, and the front terminal 13 (corresponding to the “terminal” of the present invention) of the fuse 11 of the present embodiment is exposed. Make up). Therefore, the front terminal 13 has an elongated rectangular parallelepiped shape extending in the longitudinal direction of the column portion 18. Now, on the peripheral surface of the cylindrical portion 18, a male screw portion 21 is formed from a position slightly away from the front end in a longitudinal direction to a position closer to the center. The male screw portion 21 is formed, for example, so as to protrude from the outer peripheral surface of the column portion 18, and the tip of the screw thread is lower than the rear terminal 14.

On the other hand, the fuse unit 10 of the present embodiment
Fuse holder 12 (hereinafter, "holder 12")
2), as shown in FIG. 2, a case 19 is formed in a cylindrical shape having a bottom with a synthetic resin, and the fuse 11 is inserted into the case 19. The back wall 19A of the case 19 has a back connection portion 1
6 (corresponding to the “terminal connection portion” of the present invention).
Installed via B. An open-side connecting portion 17 (corresponding to the “terminal connecting portion” of the present invention) is provided on the open side of the case 19, and the open-side connecting portion 17 is curved along the inner periphery of the holder 12. The contact plate 17A is bent
B (see FIG. 3). These two connecting parts 1
6 and 17 are inserted into a mold, and a synthetic resin is filled in the mold to form a case 19 and connect the connecting portions 16 and 17 to the case 19. A female screw portion 22 is formed on the inner peripheral surface of the case 19 from a position slightly away from the inner wall 19A in the longitudinal direction to a position closer to the center. Female thread part 2
2 is formed so as to protrude inward from the inner peripheral surface of the case 19.

The operation and effect of the fuse unit 10 according to this embodiment will be described. Although not shown, the fuse unit 10 connects, for example, a power cable of an electric vehicle to the tip of each of the connection portions 16 and 17 extending outside the holder 12.

First, the fuse unit 1 of the present embodiment
The operation of mounting the fuse 11 at 0 will be described. The handle portion 23 of the fuse 11 is gripped, and the front end of the fuse 11 is inserted into the insertion opening 15 of the holder 12. When the front end of the male screw portion 21 and the rear end of the female screw portion 22 abut, the fuse 11 is rotated by operating the handle portion 23 to screw the male screw portion 21 and the female screw portion 22 together. The screwing of the screw portions 21 and 22 proceeds, and the fuse 1
When the first terminal 1 approaches the back wall 19A of the holder 12, the front terminal 1
3 abuts against the contact disk 16A of the back side connection portion 16, elastically deforms the spring 16B and pushes the contact disk 16A forward.

Then, as shown in FIG.
Reaches the screwing end position, the male screw portion 21 and the female screw portion 22
And the fuse 11 and the holder 12 are firmly held. At this time, the front terminal 13 holds the contact disk 16A in a pressed state, and the rear connection portion 16 presses the contact disk 16A against the front terminal 13 by the elastic reaction force of the spring 16B. Thereby, the front terminal 13
And the back side connection part 16 are electrically connected. On the other hand, although the rear terminal 14 is located on the upper surface of the fuse 11 in FIG. 2, the rotation of the fuse 11 faces the open connection portion 17 as shown in FIG. In addition, the open-side connecting portion 17 presses the contact plate 17A against the rear terminal 14 by the elastic reaction force of the bending piece 17B. Thereby, the rear side terminal 14 and the open side connection portion 1
7 are electrically connected.

Thus, the fuse unit 10
Attaches the fuse 11 and electrically connects the fuse 11 to a power line (not shown). Here, the fuse unit 10 accommodates and protects the fuse 11 inside the holder 12, and conducts electrical connection between each terminal 13, 14 and each connection portion 16, 17 inside the holder 12 to connect the fuse 11. Protecting parts.

Next, the replacement operation of the fuse 11 will be described. As described above, the fuse 11 (see FIG. 3) attached to the holder 12 is rotated in the opposite direction to the case of attachment by operating the handle portion 23, so that the screw portion 21,
The screws 22 are released from each other. Then, handle part 23
, The fuse 11 is removed from the holder 12 to remove the fuse 11. Then, the removed fuse 11 is replaced with a new one, and the new fuse 11 is mounted on the holder 12 in the same manner as the mounting operation described above.
Thus, the replacement of the fuse 11 in the fuse unit 10 of the present embodiment is completed.

As described above, according to the fuse unit 10 of this embodiment, the fuse 11 can be attached and detached by directly fitting and removing the fuse 11, and other components such as the nut 4 are used as in the conventional example. No need. Further, in the present embodiment, a handle portion 23 is formed in the fuse 11, and the fuse 11 can be attached and detached by operating the handle portion 23. Thereby, in the conventional example, the nut 4
There is no need to use a tool such as a wrench required for attaching and detaching. In addition, the handle portion 23 is located outside the holder 12 even when the fuse 11 is fitted to the holder 12. This facilitates the operation of the fuse 11. Therefore, according to the fuse unit 10 of the present invention,
The replacement of the fuse 11 can be easily performed.

Further, the fuse unit 10 protects the fuse 11 by the holder 12,
Since the conductive connection between the connection portions 3 and 14 and the connection portions 16 and 17 can be protected, the reliability can be improved. Further, in the present embodiment, the fuse 11 is manufactured using the general-purpose fuse 2, so that the economy is excellent.

<Other Embodiments> The present invention is not limited to the above embodiments. For example, the following embodiments are also included in the technical scope of the present invention.
In addition to the following, various changes can be made without departing from the scope of the invention. (1) In the above embodiment, the external thread 21 is connected to the fuse 1
1, the female screw portion 22 is formed on the inner circumferential surface of the holder 12, but the male screw portion may be formed on the fuse holder, and the male screw portion may be formed on the fuse. For example, as shown in FIG. 4, a female screw part 22 is recessed on the tip end surface of the fuse 11, and a male screw part 21 is protruded on the inner wall 19 </ b> A of the holder 12.
3 and 14 are formed at the front and rear portions of the outer peripheral surface of the fuse 11, and the pair of connecting portions 16 and 17 of the holder 12 are formed at the front and rear portions of the inner peripheral surface of the holder 12. good.

(2) In the above embodiment, the fuse 11
Is a general-purpose production of the fuse 2 of the conventional example, but may be a production of a fuse dedicated to the fuse unit according to the present invention.

(3) In the above embodiment, the front terminal 13
Is provided on the front end surface of the fuse 11 in the fitting direction, the rear terminal 14 is provided on the outer peripheral surface of the rear portion of the fuse 11, and the connection portions 16 and 17 are arranged on the holder 12 correspondingly. However, the present invention is not limited to this. For example, each terminal may be formed on the outer peripheral surface of the fuse, and each terminal connection portion may be provided in the fuse holder in correspondence with the terminal.

(4) In the above embodiment, the back side connection portion 1
Reference numeral 6 denotes a configuration in which the contact disk 16A is pressed by the spring 16B to the front terminal 13 to be connected thereto, and the open-side connecting portion 17 is configured to press the contact plate 17A to the rear terminal 14 by the bending piece 17B to be connected thereto. However, the present invention is not limited to this, and any configuration may be used as long as each terminal connection portion and each terminal can be connected. (5) In the above embodiment, the handle portion 23 is formed in a T-shape. However, the handle portion 23 may have another shape, for example, a cylindrical shape provided coaxially with the fuse. (6) In the above embodiment, the holder 12 includes the fuse 11, but may expose the fuse.

[Brief description of the drawings]

FIG. 1 is a sectional view of a fuse according to an embodiment of the present invention.

FIG. 2 is a partially cutaway perspective view of a fuse unit.

FIG. 3 is a sectional view of a fuse unit.

FIG. 4 is a sectional view of a fuse unit according to another embodiment.

FIG. 5 is a perspective view of a conventional fuse unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Fuse unit 11 ... Fuse 12 ... Fuse holder 13 ... Front terminal (terminal) 14 ... Rear terminal (terminal) 16 ... Back side connection part (terminal connection part) 17 ... Open side connection part (terminal connection part) 19A ... Back wall 21, 22 ... screw part 23 ... handle part

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazunori Chikada 1-7-10 Kikusumi, Minami-ku, Nagoya-shi, Aichi Prefecture Inside Harness Research Institute, Inc. 14 Sumitomo Wiring Systems, Inc. F-term (reference) 5G502 AA01 BA07 CC16 CC26 CC41

Claims (4)

[Claims] A fuse, a fuse holder for holding the fuse, a fuse provided on the fuse and the fuse holder,
A screw portion that is screwed together by rotating the fuse relative to the fuse holder; provided on the fuse holder, when the fuse reaches an end position of the screwing, A fuse unit comprising: a pair of terminal connecting portions electrically connected to the pair of terminals provided. 2. A fuse comprising: a fuse; and a fuse holder for holding the fuse. When the fuse is held by the fuse holder, a pair of terminals provided on the fuse and a pair of terminals provided on the fuse holder. In the fuse unit in which the connection portion is conductively connected, the fuse is formed in a shaft shape, while the fuse holder is formed in a cylindrical shape capable of fitting the fuse inside, and the fuse and the fuse holder are formed. The fuse and the fuse holder are held in a mutually fitted state by screwing of screw portions formed on a peripheral surface, and the terminal and the terminal connection portion are configured such that the fuse is connected to the fuse holder. Characterized in that they are arranged so as to be electrically connected to each other when reaching the terminal position of the screwing. Zuyunitto. 3. The fuse according to claim 1, wherein one of the terminals is disposed on a front end face in a fitting direction of the fuse, and one of the terminals is disposed on an inner wall of the fuse holder so as to abut against the front end face of the fuse. Arranging the terminal connection portion, and arranging the other terminal and the other terminal connection portion on each of portions of the peripheral surface of the fuse and the fuse holder where the fuse faces each other at the terminal position. 3. The fuse unit according to claim 2, wherein: 4. The fuse unit according to claim 2, wherein a handle portion for screwing the fuse is provided on a rear end face of the fuse in the fitting direction. .