JP3083059B2 - Fusible link - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusible link (high-current fuse) used as a circuit protection member for a vehicle.
About.

As shown in FIG. 9, a fusible link has a pair of female terminals 22 and 22 fixed to both ends of a fusible conductor 21 inserted into a housing 24 made of a heat-resistant resin, and a cover 27 made of a transparent plastic. And a lock claw 25 and a lock piece 28 are used to lock both of them.
In some cases, a heat radiating plate 23 made of a low melting point metal is added to the fusing portion 21a to improve the fusing characteristics of the fusing portion 21a.

The cover 27 has a rated current value (30 A, 4
OA) is engraved or printed in advance, but a projection 26 is provided on the upper edge of the housing 24 and a recess 29 is provided on a corresponding portion of the cover 27 to prevent erroneous assembly.
FIGS. 10A to 10D show different positions a, b, and 4 with respect to housings 24a to 24d of four fusible links having different rated currents and their covers 27a to 27d.
The projections 26 and the depressions 29 are provided in c and d.

[0004]

As shown in FIGS. 9 and 10, a conventional fusible link has a convex portion 26 and a concave portion 29. As shown in FIG.
Is different for each rated current value.
And the structure of the mold of the cover 27 must be changed,
This was a factor of cost increase. Further, since the convex portion 26 and the concave portion 29 are small in view of the overall shape of the housing 24 and the like, the cover 27 and the housing 24
Even if the combination with is different, it will be locked,
There was a risk of incorrect assembly. An object of the present invention is to reduce costs by using a common mold for the housing,
An object of the present invention is to provide a fusible link having a structure capable of preventing erroneous assembly of a housing and a cover.

[0005]

According to the present invention, a pair of connection terminals provided at both ends of a fusible conductor are inserted into a heat-resistant resin housing. while, in the fusible link formed by lock covered with a transparent plastic cover displays the rated current value to the upper end opening of the housing, the rated current value
The cover is arranged at different positions according to
For sensor detection that can be distinguished for 180 ° rotation of
The concave portion or the convex portion is provided on the inner surface of the cover .

[0006]

[Function] Since the convex portion (or concave portion) indicating the difference in the rated current value is provided only on the cover, the housing and the molding die have the same structure, and the housing can be shared, so that the cost can be reduced. Becomes In addition, since the convex portion (or concave portion) of the cover is selected without error by, for example, the parts feeder by reading the sensor, erroneous assembly can be reliably prevented. Further, since the projections (or depressions) are provided on the inner surface of the cover, when the parts are fed by the parts feeder, there is no trouble such as catching, so that the parts can be smoothly supplied.

[0007]

In EXAMPLES 1 and 2, and inserting the pair of female terminals 2, 2 form with the opposite ends of the fusible conductor 1 to the housing 4 made of heat-resistant resin, covered with a cover ₆₁ of transparent plastic Lock with the lock claw 5 and the lock piece 7,
A radiator 3 made of a low-melting-point metal such as Sn is provided at the fusing portion 1a of the fusible conductor _1, and a rated current value (20A in the illustrated example, see FIG. 3) is displayed on the cover 61.
This embodiment shows an example in which a fusible conductor 1 and a pair of female terminals 2 and 2 are punched out of a single conductive metal plate (for example, a copper alloy such as brass) and formed integrally by bending. However, the fusible conductor 1 and the female terminal 2 may be formed as separate members and connected by known means such as spot welding or laser welding, or a male terminal may be used instead of the female terminal 2.

[0008] The above is the same as that of the conventional example, in the present invention, as shown in FIGS. 3 and 4, recesses 8 are provided on the inner surface of the cover _61. The recess 8 is provided in the cover 6
_Although it is provided as a small pin hole-shaped recess at the upper left corner when viewed from the front side of FIG. _1, it may be provided as a pin-shaped protrusion 8 'like a cover 61' shown in FIG.

FIGS. 6A to 6C show a case where the rated current value is 30.
A, 40A, and 50A covers 6_Two, 6_Three, 6_FourAbout
Without the concave portion 8, lower left corner B, upper right corner
The one provided in C is shown. In addition, the concave part 8 (or convex part)
The position of the portion 8 ') is ₁~ 6_FourRotate 180 °
The cover with different rated current values
Not to be provided.

As described above, the recesses 8 are provided in the transparent plastic covers 6 ₁ , 6 ₃ , and 6 ₄ at different positions due to the difference in the rated current.
The a cover 6 ₂ including without by detecting the position by a known sensor can determine the current rating of the cover. Although the cover 6 ₂ not provided with a recess 8, it is sufficient to those which are not sensitive in advance sensor for example and 30A cover.

FIG. 7 shows an example of a sensor device for detecting the recess 8. The sensor device 10 includes a case 11, a photoelectric switch 12, and an optical fiber 13. Case 11 notch 11c for positioning to receive the lock piece 7, 7 in the circumferential wall of the recess 11b to form a recess 11b to the cover ₆₁ by the midsole 11a provided at the lower end
Is provided. The optical fiber 13 is housed in the case 11, the distal end 13 c is exposed on the bottom surface of the midsole 11 a, and the proximal end is connected to the photoelectric switch 12. As shown in FIG. 8, the optical fiber 13 has a light projecting path 13a and a light receiving path 13b integrated together, and a light source (not shown) is disposed in the light projecting path 13a, and a photoelectric switch 1 is disposed in the light receiving path 13b.
The photoelectric switch 12 converts light into an electric signal and outputs a signal to an output device (not shown).

[0012] Therefore, when the cover ₆₁ is provided at a predetermined position by a parts feeder (not shown), the positioning of the cutout portion 11c and the lock piece 7 lowers the case 11 of the sensor device 10, the case cover ₆₁ 11 And the front end 13 c of the optical fiber 13 is opposed to the concave portion 8. The distance between the tip 13c of the optical fiber 13 and the bottom of the recess 8 is set in advance in the range of 1 to 10 mm, and the amount of reflected light received by the light receiving path 13b is set to about 30%.
An output signal from the output device is an OK signal. Therefore, if the concave portion 8 is not located at a predetermined position, the reflected light amount greatly exceeds 30%.

[0013] However, when the case 11 to cover ₆₁ is not covered perfect, because the amount of reflected light occurs greatly reduced to detect mistakes than 30%, the other to the reference measurement in order to prevent this One optical fiber 13 'is provided.
The optical fiber 13 'is set in advance 10mm or less the distance between the case of the optical fiber 13 as well as its tip and the cover ₆₁ of the surface, also the amount of reflected light that the light receiving path receives 100
%, And the detection circuit using the optical fiber 13 may be operated only when the amount of reflected light is 100%. At 100%, the output signal from the output device becomes an OK signal.

In the above description, the concave portion 8 or the convex portion 8 'is
_1, 6 _3, 6 ₄ of has been described an example in which one by one in different positions, may be two or three combinations, short or if detecting the difference in light sensor. Therefore,
The markings are not limited to the concave portions 8 and the convex portions 8 ', and may be provided with markings that do not allow light to pass through, such as textured slopes or paint, for example, simple figures and symbols such as ▲, Δ, and ●.

[0015]

As described above, according to the present invention, a pair of connection terminals provided at both ends of a fusible conductor are inserted into a heat-resistant resin housing, and a rated current value is indicated at an upper end opening of the housing. For a fusible link that is locked with a transparent plastic cover, the rated current
It is placed at different positions according to the
Sensor detection that makes it possible to distinguish 180 ° rotation
Since the recesses or protrusions of the use are those made by providing on the inner surface of the cover, it is common the structure of the housing of the different fusible link of the rated current, since the mold is the same, is possible to reduce the costs In addition, since the rated current value of the cover can be detected and selected by the sensor, erroneous assembly to the housing can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a fusible link showing one embodiment of the present invention.

FIG. 2 is a front view of the assembled state of FIG. 1;

3A is a plan view of the cover of FIG. 1, and FIG. 3B is a bottom view.

FIG. 4 is a sectional view taken along line XX of FIG.

FIG. 5 is a sectional view showing another embodiment of the present invention.

6 (A) to 6 (C) are plan views of covers each showing another embodiment of the present invention.

7 is an explanatory view of a sensor device for detecting the concave portion 8 of the cover ₆₁ in the FIG.

FIG. 8 is an explanatory diagram of the optical fiber of FIG. 7;

FIG. 9 is an exploded perspective view of a conventional fusible link.

FIGS. 10A to 10D are front views of a conventional fusible link.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 soluble conductor 2 female terminal 4 housing 5 lock claw 6 _{1 to} 6 ₄ housing 7 cover 8 concave part 8 'convex part

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tsune Hanasaki 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture Inside Yazaki Parts Co., Ltd. (72) Mitsuhiko Totsuka 206-1 Nunobikihara, Haibara-cho, Haibara-gun, Shizuoka Prefecture (56) References JP-A-61-294730 (JP, A) JP-A-59-83764 (JP, U) JP-A-6-9039 (JP, U) (58) Fields surveyed ( Int.Cl. ⁷ , DB name) H01H 37/76 H01H 69/02 H01H 85/00-87/00 B07C 1/00-9/00 B65D 35/44-35/54 B65D 39/00-55/16

Claims (1)

(57) [Claims] 1. A transparent plastic housing in which a pair of connection terminals provided at both ends of a fusible conductor are inserted into a housing made of a heat-resistant resin, and a rated current value is displayed in an opening at an upper end of the housing. In a fusible link that is locked with a cover, it is located at different positions according to the rated current value.
And the 180 ° rotation of the cover
Distinguishable and the recesses or protrusions for the sensor detection comprising
A fusible link provided on the inner surface of the cover .