JP3565386B2 - Hyuze secondary short-circuit prevention mechanism - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuse fuse secondary short-circuit prevention mechanism used in an electric circuit of an automobile or the like, and particularly for preventing a secondary short-circuit by contacting each holding piece holding the fusing portion after the fusing portion is blown. The present invention relates to an improved fuse short-circuit prevention mechanism.
[0002]
[Prior art]
A schematic configuration of a general fuse applied to a connector for connecting a wire harness of an automobile or the like will be described with reference to FIGS. 8, 9, and 10. The fuse 50 has a fuselage link 51 formed in a required shape, an insulation that incorporates the fuselable link 51 therein, and is detachably attached to a high-density multi-pole connector (not shown) to enable terminal connection. And a housing 61 made of the same.
[0003]
The usable link 51 has a pair of female terminal portions 52, 52 facing each other, and each locking piece 53 is cut and raised on the non-facing surface side of each female terminal portion 52. Each of the holding pieces 54 extending upward with a relatively small width from each of the non-opposite surfaces is bent and connected to each other, and an intermediate portion of the connection portion matches the allowable fusing capacity. A fusing portion 55 having a small width is formed.
[0004]
The housing 61 is divided by an insulating partition 64 at the lower half of one of the inner wall surfaces facing each other to receive the female terminal portions 52, each of which is provided with an insertion opening 63 for a male terminal. A pair of terminal housings 62, 62 and a locking groove 65 for locking each locking piece 53 are formed respectively.
[0005]
Further, a pair of guide grooves 67, 67 each having a protruding end formed by an inclined surface 67 a for guiding each locking piece 53 in the fusing chamber 66 are formed in the upper half side of the inner wall surface. A lid member 68 is fitted into the upper opening.
[0006]
Incorporation of the fusible link 51 into the housing 61 is performed by aligning the locking pieces 53 of the fusible link 51 along the guide grooves 67 from the upper opening side of the housing 61 using an appropriate insertion jig or the like. By pushing the housing 61 into the housing 61, the usable link 51 is incorporated. That is, the pair of female terminal portions 52, 52 are exposed in the corresponding terminal storage portions 62 in a correct posture by being pushed in this way.
[0007]
Next, with the progress of the insertion operation, the locking pieces 53 are pressed and accumulated inward by the respective inclined surfaces 67a. Thereafter, when the female terminal portions 52 are received in the terminal storage portions 62, the locking pieces 53 are restored from the pressed state, and are locked in the locking grooves 65, thus completing the assembly.
[0008]
In the fuse 50 having the above configuration, each female terminal portion 52 is inserted through an insertion opening 63 into each male terminal portion protruding into a mounting portion of a high-density multipolar connector (not shown). In this state of use, when a current exceeding the allowable value flows through the attached circuit device, the fusing portion 55 is melted by the Joule heat, thereby breaking the circuit and ensuring the safety of the device.
[0009]
[Problems to be solved by the invention]
However, in the case of the conventional fuse 50 described above, if the fuse 50 is used in an extremely violent place, such as an automobile, where the vibration and impact are severe, as shown in FIG. Each support piece 54, which has lost its support due to melting, may incline inward due to vibration or impact and may come into contact again in ab of FIG. 10, and these may come into contact with each other to cause a secondary short circuit accident. Will occur.
[0010]
In order to prevent the occurrence of such a secondary short-circuit accident, for example, a fuse as disclosed in Japanese Utility Model Laid-Open Publication No. 64-33146 has been proposed. However, the secondary short-circuit prevention structure according to the fuse has a relatively complicated structure, and has problems in reliability and cost.
[0011]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems, and it is possible to prevent occurrence of a secondary short circuit accident due to contact between holding pieces after fusing of a fusing portion by a simple structure. And a secondary short-circuit prevention mechanism for the fuse.
[0012]
[Means for Solving the Problems]
The above object of the present invention is the first configuration of the present invention, in which one end in the longitudinal direction forms a male terminal receiving portion to be electrically connected by engaging with the male terminal portion, and the other end is formed by a fusible conductor. A pair of female terminals connected to the other end of the fuselage to form a fuse fusing portion, and extending in the vertical direction to accommodate these female terminals and to vertically separate the female terminals in a loosely fitted state. A housing provided with an insulating partition wall, each male terminal receiving portion having a pressing contact portion which protrudes upward and downward at two locations along the longitudinal direction at two different locations, and wherein the upper pressing contact portions are each formed of the insulating material. This can be achieved by a fuse secondary short circuit prevention mechanism which is directed to the partition wall and at least one of the pressing contact portions has elasticity.
[0013]
The fuse has a secondary short-circuit preventing mechanism according to the first configuration of the present invention, wherein the male terminal is provided in the male terminal receiving portion of the housing in such a manner that the male terminal protrudes in the male terminal receiving portion so as to face two upper and lower portions along the longitudinal direction thereof. It is inserted between the parts and is supported stepwise from the left and right by two raised parts. The male terminal receiving portion is housed in the housing in parallel with the insulating partition of the housing by receiving a force for rotating the upper portion of the male terminal receiving portion to the outside of the housing by the raised portion of the elastic pressing contact portion. When the fuse fusing portion is blown by the overcurrent, the balance between the male terminal receiving portions is broken, so that the upper portion of each male terminal receiving portion pivots outward by the force of rotating outwardly of the housing. . As a result, the interval between the blown fusing portions is increased, and when these fusing portions are subjected to vibration or the like, the danger of re-contacting and causing a secondary short circuit is avoided.
[0014]
According to one preferred embodiment of the present invention, a portion above the pressing contact portion is an elastic projection, and a portion below the pressing contact portion is a projection made of an elastic spring member. As a result, the turning force of the female terminal portion when the fuse is blown is increased, and the male terminal portion is more easily fitted.
[0015]
According to another preferred embodiment of the present invention, the upper portion of the pressing contact portion is a doubly supported leaf spring, and the lower portion has a lower end fixed to the female terminal receiving portion. In addition to the effects of the preferred embodiment, the male terminal can be easily inserted with a small pressing force, especially since the upper end of the lower pressing contact portion extends in the length direction and is deformable. And at the same time, the elastic biasing force of the female terminal is reduced, so that the rotation of the female terminal after the fusing is flexible and the recoil due to the fusing can be suppressed to be small.
[0016]
The insulating partition of the housing is formed such that the width of the lower portion is smaller than the width of the upper portion, and secures a space for pivoting the male terminal receiving portion when the fuse blowing portion is blown. This makes it easier for the lower portion to pivot inward when the male terminal receiving portion pivots outward, further enhancing the effect of the mechanism of the present invention.
[0017]
Further, the above object is a second configuration of the present invention, in which a longitudinal end is formed with a male terminal receiving portion which is engaged with a male terminal and is electrically connected thereto, and the other end is formed of a fusible conductor at the other end. And a housing having a pair of female terminal members connected to the fuse terminal to form a fuse fusing portion, and an insulating partition that accommodates the female terminal members and extends vertically to separate the female terminal members from side to side. In the fuse-use secondary short-circuit prevention mechanism used for an electric circuit of an automobile or the like, the insulating partition has a space which is close to the center axis plane toward the lower part of the housing, and each male terminal receiving portion is provided. Has a pressing contact portion which protrudes oppositely at two locations along the longitudinal direction and is stepped, and the upper pressing contact portion is respectively directed to the opposite side to the insulating partition wall, and the upper end thereof is insulated. On the slope of the bulkhead A cantilevered leaf spring formed with a free end movably elastically contacted, a lower pressing contact portion forming a contact portion integral with the male terminal receiving portion, and the fuse blowing portion caused by heat generation; As soon as the pair of female terminal members are separated by the fusing, the upper pressing contact portion generates an elastic repulsive force against the inserted male terminal through the entire male terminal receiving portion, and The present invention is also achieved by a secondary short-circuit prevention mechanism for fuses, characterized in that the space is pivotable so as to close the space toward the inclined surface of the partition wall with the upper corner of the pressing contact portion as a fulcrum. I can do it.
[0018]
According to the above-described configuration, when the fuse fusing section is blown by the passage of the male terminal overcurrent to the male terminal receiving section mounted in the housing, the left and right male terminals acting between the male terminal receiving sections and the insulating partition wall. The tension balance caused by the elastic force of the upper pressing contact portions acting between them is broken, and each male terminal receiving portion is substantially formed by a step existing between the upper corner portion of the lower pressing contact portion and the upper receiving portion. And act as a pivot point to close the cavity in the direction in which the lower ends approach each other, so that the upper fusing portions pivot outwardly away from each other. As a result, the space between the blown out portions is widened, and when these blown end portions are subjected to vibration or the like, the left and right male terminal receiving portions are formed on the inclined surface of the insulating partition wall by the large elastic force of the upper pressing contact portions. The risk of being pressed against and causing a re-contact of the fusing end to cause a secondary short circuit is more reliably avoided.
[0019]
Further, according to a preferred embodiment of the present invention having such a configuration, the upper pressing contact portion forms a contact point with the male terminal and has a mountain-shaped vertical cross-sectional shape having a top serving as a point of action at the same time, The lower pressing contact portion has a trapezoidal vertical cross-sectional shape in which the upper side forms a wide contact surface with the male terminal below the top. With such a configuration, the male terminal can obtain a large contact area near the base thereof, so that the conductivity becomes good, and an accident such as heat generation due to poor contact can be avoided.
[0020]
Further, according to another preferred embodiment, the inner surface of the male terminal receiving portion which can be pressed against the insulating partition wall is constituted by a double plate formed by folding one fusible conductive metal plate. The upper pressing contact portion is an elongated bent piece obtained by punching the inner plate along the longitudinal direction, and the upper end which is a free end thereof has a cutout portion formed in the outer plate. It penetrates and makes slidable elastic contact with the inclined surface of the insulating partition wall. With such a configuration, the punching process can be completed only once, and the manufacturing process is rationalized. In addition, relatively expensive materials can be saved.
[0021]
Similarly, according to another preferred embodiment, the inner surface of the male terminal receiving portion that can be pressed against the insulating partition wall is a double plate formed by folding a single fusible conductive metal plate. The outer plate is provided with an elastic support piece, which is an elongated bent piece that is stamped along its longitudinal direction and extends substantially parallel to the pressing contact portion, and has a free end formed on the inclined surface of the insulating partition wall. And elastically extended. By providing such an elastic support piece, a separation interval between the pair of male terminal receiving portions and the lower end portion of the insulating partition at the time of non-fusing is secured, and an elastic buffering action against pivoting of the male terminal receiving portion at the time of fusing is provided. The fusible link that has been applied and blown is prevented from recoiling against pivotal movement, and secondary contact is reliably prevented.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment relating to a first configuration of a fuse secondary short-circuit prevention mechanism according to the present invention will be described with reference to FIGS. 1, 2, and 3. FIG. FIG. 1 is a perspective view showing a schematic configuration of a fuse to which the secondary short-circuit prevention mechanism according to the present embodiment is applied, FIG. 2 is a longitudinal sectional view of a male terminal receiving portion constituting the secondary short-circuit prevention mechanism, and FIG. FIG. 5 is a longitudinal sectional view in a state where the fuse of FIG.
[0023]
As shown in FIGS. 1 to 3, a fuse 10 of the present embodiment includes a fuselage link 11 formed in a required shape, a fuselage link 11 incorporated therein, and a high-density multipole connector (FIG. 2 and FIG. 3 show only one portion of one terminal pin) and a housing 31 made of an electrically insulating material such as plastic, which is detachably mounted to enable terminal connection.
[0024]
The usable link 11 includes a pair of female terminal members 20 facing each other, and each locking piece 13 is formed on the non-facing surface side of each male terminal receiving portion 12 by being cut and raised upward. I have.
[0025]
Further, from the non-opposing surface side of each female terminal portion 12, a holding piece 14 extending upward is provided. Each holding piece 14 is composed of a tip portion 16 bent inward through an upper bent portion 15. The end portions 16, 16 of the holding pieces 14 are set to have a narrow width corresponding to the fusing capacity and are connected by a fusing portion 17 provided with a tin chip.
[0026]
The housing 31 is in the form of a rectangular tube, and a pair of spaced terminal housings 32 for receiving the male terminal receivers 12 are provided on the lower half of one of the inner walls facing each other. In order to assure the above, the partition is defined by a vertical insulating partition 34 reaching the upper half side. As shown in FIG. 3, the pair of terminal storage sections 32 have an insertion opening 33 of the male terminal 40 formed in the bottom, and each of the locking pieces 13 is locked to the inner wall of the housing. A locking groove 35 that is continuous upward from the lower bottom surface side is formed.
[0027]
As shown in FIG. 2, in use, the male terminal 40 is inserted through the insertion opening 33 at the lower end, and is firmly fixed to the housing 31 by a fitting such as a socket or a bush (not shown), and the male terminal is received. It is inserted inside the part 12. The male terminal is supported at two upper and lower locations in the male terminal receiving portion by pressing contact portions 41 and 42 which are raised to face each other stepwise. The pressing contact portion 41 disposed in the upper portion has a central portion protruding toward the insulating partition wall 34 extending vertically upward, and is formed by a doubly supported plate integrally stamped with one portion of the male terminal receiving portion. And the other end is in contact with the diametrically opposed surface of the male terminal 40.
[0028]
It is preferable that the pressing contact portion 41 arranged on the upper portion has elasticity itself in consideration of frictional resistance when the male terminal is inserted. However, the pressing contacting portion 41 does not need to have elasticity. This is because the function of the pivot point with respect to the terminal can be performed.
[0029]
The other pressing contact portion 42 disposed below the pressing contact portion 41 is implemented by, for example, a cantilever leaf spring member having a raised portion whose lower end is fixed to the lower end of the male terminal receiving portion. In this configuration, as soon as the fusing portion 17 is melted, the double-supported elastic pressing contact portion 41 and the contact portion 42 of the cantilevered leaf spring member have the male point with the point A in FIG. A force is applied to rotate the receiving portion 12 in the Z direction, that is, in the housing 31, to rotate the upper end of the male terminal receiving portion 12 outward.
[0030]
When receiving the above-described rotational force, the lower end of the male terminal receiving portion 12 moves toward the insulating partition 34 of the housing 31. In order to receive this movement, the lower end 34a of the insulating partition wall 34 is formed to have a smaller diameter than the upper end 34b, so as to secure a space where the lower end of the female terminal member 20 slightly rotates. Therefore, when viewed from the whole of the fusible link 11, the melting of the fusing portion causes the two female terminal members to rotate individually in the opposite directions at the same time, and both stop in the expanded state, and the left and right holding pieces 14 are stopped. The tips "a" and "b" have no possibility of permanent contact, and a secondary short circuit is avoided.
[0031]
In the case of the present embodiment, the incorporation of the fusible link 11 into the housing 31 is carried out by using an appropriate insertion jig or the like, and engaging the locking pieces 13 of the fusible link 11 with the guide grooves from the upper opening side of the housing 31. Push in along 37 (FIG. 3). Thereafter, the upper portion of the housing 31 is covered and sealed with the lid 36, but when each male terminal receiving portion 12 is received in each terminal storage portion 32, each locking piece 13 is restored from the pressed state, It is locked in each locking groove 35. The locking piece 13 prevents the fusible link 11 from being pushed upward when the male terminal 40 is inserted into the male terminal receiving portion 12 of the female terminal member 20.
[0032]
Briefly describing the connection between terminals using the fuse 10 according to the present embodiment, each female terminal portion 12 is inserted through an insertion opening 33 with respect to each male terminal projecting into a mounting portion of a high-density multipolar connector (not shown). Used by connecting. Then, when a current exceeding a permissible value is applied to the corresponding circuit device in this use state, the fusing portion 17 is melted by the Joule heat, and the circuit is cut off to secure the safety of the device.
[0033]
Next, one embodiment of the second configuration of the present invention will be described with reference to FIGS. In addition, the same reference numerals as those used in the embodiment relating to the above-described first configuration use the numbers with 100 added to facilitate understanding of the description.
[0034]
FIG. 4 is a longitudinal sectional view showing a state where the fusible link 111 is incorporated in the housing 131 in the secondary short-circuit prevention mechanism of the fuse 110 according to the present embodiment. FIG. 5 is a partial vertical cross-sectional view of the secondary short-circuit prevention mechanism of FIG. 4 in a normal use state, that is, before a fuse is blown, in a used state, in which the male terminal 140 is inserted into the female terminal member 120. FIG. 6 is a longitudinal sectional view of the secondary short-circuit prevention mechanism similar to FIG. 4 when the fuse is blown. The blowout portion 117 at the tip end portion 116 of the fusible link holding piece 114 is separated into two parts a and b. ing. FIG. 7 is a partially enlarged longitudinal sectional view of the state of FIG. 6, and shows a state in which the female terminal member 120 has pivoted inside the housing 131.
[0035]
In FIG. 4, the upper portions of a pair of elongated strip-shaped holding pieces 114 extending vertically upward are abutted with the tip portions 116 in the horizontal direction via bent portions 115, and welded together with a tin block to be joined by heating and fusing. The upper part of the U-shape formed with 117 and a pair of male terminal receiving parts 112 punched out of one heat-soluble metal plate integrally with the upper part and bent in the shape of a box-shaped cylinder are attached to the lower part. Is shown in a state in which the fusible link 111 is incorporated in the housing 131. The fusible link 111 substantially forms the female terminal member 120 in the present invention.
[0036]
In FIG. 4, the female terminal member 120 has not yet received the male terminal 140, and the lower part inside the housing is defined by an insulating partition 134 so as to be equally divided in the vertical direction. A state in which a pair of left and right male terminal receiving portions 112 are accommodated in one terminal accommodating portion 132 is shown. The fusible link 111 is positioned in the terminal storage portion while being guided from above by a pair of opposing guide grooves 137 formed in the left and right inner walls of the housing 131. At this time, the holding piece 114 of the male terminal receiving portion 112 is At the upper part of the rectangular outer wall 112b coupled to the same vertical plane, a locking piece 113 cut obliquely upward and outward toward the outside is provided with a locking groove 135 vertically recessed facing the housing inner wall. And is engaged under the housing projection 131a protruding inward of the housing to prevent the housing from being pulled out of the housing. Finally, the cover 136 is fitted over the open upper portion of the housing 131, thereby completing the assembly.
[0037]
Regarding the internal structure of the housing 131, as shown in detail in FIG. 5, an inclined wall 134a of an insulating partition wall 134 is formed to extend vertically to approximately half the height of the housing 131 so as to face the locking groove 135. The inclined surface 134a is inwardly inclined so as to gradually decrease its thickness from the central portion to the lower end portion of the partition wall with respect to the central axis plane V, and the inner wall 112a directly facing the insulating partition wall 134 of the male terminal receiving portion 112. A space 146 having an acute triangular cross section is formed between the two. The apex angle α of this cavity 146 is shown in FIGS. 5 and 7 by arrows. As will be described later in detail, the apex angle α is the same as the pivot angle when the female terminal member 120 is separated right and left and pivots in opposite directions when the fuse is blown.
[0038]
Next, the configuration and operation of the male terminal receiving portion 112 of the female terminal member 120 will be described with reference to FIGS. 5 and 7. Each male terminal receiving portion 112 has a step at two upper and lower positions along the longitudinal direction. And press-contact portions 141 and 142 that protrude in the opposite direction. The upper pressing contact portions 142 project on the opposite side from the insulating partition 134, respectively, and form a single contact point with the male terminal 140 inserted through the insertion opening 133 of the housing 131, and at the same time act when pivoting. It is formed of an elongated leaf spring having a chevron-shaped vertical cross-sectional shape having a top portion 142b serving as a point of force. Further, its upper end 144 forms a free end and is in slidable elastic contact with the inclined surface 134a of the insulating partition wall, while its lower end 145 is fixed to the inner wall 112a of the male terminal receiving portion 112. A contact portion with the male terminal is formed.
[0039]
The lower pressing contact portion 141 has a trapezoidal vertical cross-sectional shape that forms an extensive contact surface 141a whose upper side extends in the longitudinal direction with the male terminal 140 below the top 142b of the upper pressing contact portion 142 and has a male terminal receiving portion. It is formed integrally with the outer wall 112b of the portion 112, and is in direct contact with the root portion of the inserted male terminal 140 on a wide contact surface 141a extending in the longitudinal direction.
[0040]
As soon as the pair of female terminal members 120 are separated by the fusing of the fuse blowing portion 117 due to heat generation, the elastic force of the lower pressing contact portion 141 with respect to the male terminal 140 is slightly released, and at the same time, the upper pressing contact portion 142 An elastic repulsive force is generated against the upper portion of the male terminal 140, and the entire contact portion is directed toward the inclined surface 134a of the partition 134 with the upper corner portion 141b of the lower pressing contact portion 141 as a fulcrum. It pivots over the apex of the acute triangle forming the cavity 146 to press against. As a result, the lower ends of the receiving portions are pivoted in a direction approaching each other, and the upper fusing portions are pivoted in a direction away from each other outward.
[0041]
As a result, the space between the blown portions a and b is widened, and when these blown ends are subjected to vibration or the like, the left and right male terminal receiving portions 112 are separated from each other by the elastic force of the upper pressing contact portions 142. By pressing against the inclined surface 134a of 134, the danger that the fusing ends a and b come into contact again to cause a secondary short circuit is more reliably avoided.
[0042]
The male terminal 140 of the lower pressing contact portion 141 has a wide elastic contact area at a portion close to the base thereof, so that the conductivity becomes good, and an accident such as heat generation due to poor contact can be avoided. Also, in combination with such good contact holding properties, since the upper pressing contact portion has a chevron-shaped vertical cross-sectional shape, the point of action on the male terminal surface is concentrated at one point, and a flexible rebound resilience of the portion is obtained. Thus, re-contact due to secondary vibration caused by excessive repulsion is prevented.
[0043]
The inner wall 112a of the male terminal receiving portion 112 which can be pressed against the insulating partition wall 134 is formed of a double plate formed by folding a single fusible conductive metal plate, and the upper pressing contact portion 142 has an inner side. The plate 142a is formed by an elongated bent piece obtained by punching the plate 142a in the longitudinal direction. The upper end 144, which is a free end, penetrates a cutout 147 formed in the outer plate 143a and is in slidable elastic contact with the inclined surface 134a of the insulating partition.
[0044]
Further, the outer plate 143a, which is folded back and comes into surface contact with the inner plate 142a, has an elastic support piece 143 composed of an elongated bent piece punched along the longitudinal direction, and is substantially parallel to the pressing contact portion 142. And a free end 143c is also in elastic contact with the insulating partition slope 134a. Therefore, this elastic support piece 143 ensures that both male terminal receiving portions 112 are separated from the insulating partition wall 134 at an equal distance before the fuse is blown, and at the same time, cooperates with the lower pressing contact portion 141 to form an upper portion. Exerts an elastic biasing force against the pivotal movement of the pressing contact portion 142 on the inclined surface 134a, but not so large as to overcome the elastic repulsion of the upper pressing contact portion. The damper 116 has a buffering function to prevent recoil and prevent a secondary short circuit at the fusing point.
[0045]
With such a configuration, such a fusible link 111 can perform a single punching step in manufacturing, thereby streamlining the manufacturing process and, at the same time, saving relatively expensive materials used.
【The invention's effect】
Since the secondary short-circuit prevention mechanism of the fuse according to the first and second configurations of the present invention is provided with the configuration as described above, after the fusing section is blown, each of the female terminal members is rotated outward toward the upper end thereof. The occurrence of a secondary short circuit caused by the contact of the holding pieces with each other by the holding pieces being smoothly pivoted in the separating direction can be achieved by manufacturing the fusible link by only a small sheet metal forming process. There is an effect that the prevention can be surely achieved with a simple structure without providing.
[Brief description of the drawings]
FIG. 1 is a perspective view showing one embodiment of a fuse secondary short-circuit prevention mechanism according to a first configuration of the present invention, showing a schematic configuration of a fuse.
FIG. 2 is an enlarged partial sectional view showing a male terminal receiving portion of one female terminal portion.
FIG. 3 is a longitudinal sectional view showing a state in which a fusible link is incorporated in a housing in the embodiment of FIG. 1;
FIG. 4 is a longitudinal sectional view showing one embodiment of a fuse secondary short-circuit prevention mechanism according to the second configuration of the present invention, showing a state where a fusible link is incorporated in a housing.
FIG. 5 is a partial longitudinal sectional view of the secondary short-circuit prevention mechanism of FIG. 4 in a normal use state.
FIG. 6 is a view similar to FIG. 4, but showing the fusible link in a blown state.
7 is a partially enlarged longitudinal sectional view similar to FIG. 5, showing a state in which the female terminal member of FIG. 6 is pivoted in the housing.
FIG. 8 is a perspective view showing a conventional fusible link.
FIG. 9 is a schematic longitudinal sectional view showing a state in which the conventional fusible link shown in FIG. 8 is incorporated in a housing.
FIG. 10 is a schematic longitudinal sectional view showing a state in which the fusing portion in FIG. 8 is melted.
[Explanation of symbols]
10 Heyuz
11 Huge Link
12 Female terminal
14 Holding piece
20 female terminals
31 Housing
34 insulating partition
34a Lower end of insulating partition
34b Upper end of insulating partition
40 male terminal
41 Upper bump press contact
42 Lower ridge press contact
111 Huge Link
112 Male terminal receiving part
112a inner wall
114 Holding piece
117 fuse blown part
120 female terminal member
131 housing
134 insulating partition
134a slope
140 male terminal
141 Upper Press Contact
141a contact surface
141b upper corner
142 Lower press contact
142a inner plate
142b top
143a Outside plate
143b top
144 Upper end of upper pressing contact
145 Lower end of upper contact portion
147 Notch
V center axis plane

Claims (8)

In the fuse's secondary short-circuit prevention mechanism used for electric circuits such as automobiles,
A pair of female terminals, one end of which in the longitudinal direction is engaged with the male terminal to form a male terminal receiving portion to be electrically connected, and the other end is connected to the other end by a fusible conductor to form a fuse fusing portion. A housing having an insulating partition extending vertically to accommodate these female terminal members and to separate the female terminal members left and right in a loosely fitted state while accommodating these female terminal members,
Each male terminal receiving portion has a pressing contact portion protruding stepwise oppositely at two places in the upper and lower portions along the longitudinal direction, the upper pressing contact portion is directed to the insulating partition, and at least one of the pressing contact portions is directed to the insulating partition wall. The fuse has a secondary short-circuit preventing mechanism, wherein a pressing contact portion has elasticity. 2. The mechanism according to claim 1, wherein an upper portion of the pressing contact portion is an elastic projection, and a lower portion of the pressing contact portion is a projection made of an elastic spring member. The upper part of the elastic pressing contact part is a doubly supported leaf spring, and the lower part is a cantilever leaf spring having a lower end fixed to the female terminal receiving part. Secondary short circuit prevention mechanism of fuse. The width of the lower part of the insulating partition of the housing is formed to be narrower than the width of the upper part, so as to secure a space for allowing the male terminal receiving part to rotate when the fuse blowing part is blown. 2. The secondary short-circuit prevention mechanism of the fuse according to 1. A pair of female terminals, one end of which in the longitudinal direction is engaged with the male terminal to form a male terminal receiving portion to be electrically connected, and the other end is connected to the other end by a fusible conductor to form a fuse fusing portion. Secondary short-circuit of a fuse used in an electric circuit of a car or the like comprising a member and a housing having an insulating partition extending in a vertical direction for accommodating the female terminal members and for separating the female terminal members from side to side. In the prevention mechanism,
The insulating bulkhead has a cavity close to the center axis plane toward the lower part of the housing,
Each male terminal receiving portion has a pressing contact portion that protrudes oppositely at two places in the upper and lower directions along the longitudinal direction,
An upper pressing contact portion is formed to form a cantilevered leaf spring whose free end is slidably and elastically contacted with the inclined surface of the insulating partition while the upper end is directed to the opposite side to the insulating partition. Yes,
The lower pressing contact portion forms a contact portion integral with the male terminal receiving portion, and as soon as the pair of female terminal members are separated by the fusing of the fuse blowing portion due to heat generation, the upper pressing contact portion. The portion generates an elastic repulsive force against the inserted male terminal with respect to the entire male terminal receiving portion, and the empty space is directed toward the inclined surface of the partition wall with the upper corner of the lower pressing contact portion as a fulcrum. The fuse has a secondary short-circuit prevention mechanism, which is capable of pivoting so as to close. The upper pressing contact portion is a chevron-shaped vertical cross-sectional shape having a top that forms a contact point with the male terminal and serves as a point of action at the same time, and the lower pressing contact portion is below the top and has an upper side with the male terminal. 6. The fuse-use secondary short-circuit prevention mechanism according to claim 5, wherein the fuse has a trapezoidal vertical cross-sectional shape forming a wide contact surface. An inner wall of the male terminal receiving portion that can be pressed against the insulating partition is formed of a double plate formed by folding a single fusible conductive metal plate, and the upper pressing contact portion extends the inner plate longitudinally. An elongated bent piece punched along the direction, and the upper end, which is a free end, penetrates a notch formed in the outer plate and is elastically slidable with the inclined surface of the insulating partition. 7. The fuse according to claim 5, wherein the fuse is in contact with the secondary fuse. An inner wall of the male terminal receiving portion which can be pressed against the insulating partition wall is constituted by a double plate formed by folding a single fusible conductive metal plate, and an outer plate thereof is punched along a longitudinal direction. And having an elastic supporting piece that is an elongated bent piece extending substantially parallel to the pressing contact portion,
8. The mechanism according to claim 7, wherein a free end thereof is in elastic contact with an inclined surface of the insulating partition.

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