JP4309791B2 - Fuse holder and fuse unit - Google Patents

Description

  The present invention relates to a space-saving fuse holder and fuse unit.

  Various electronic devices are mounted on automobiles as vehicles. For this reason, the said automobile has wired the wire harness. The wire harness includes a plurality of electric wires and connectors. The electric wire includes a conductive core wire and an insulating covering portion that covers the core wire. The connector includes a terminal fitting made of metal and an insulating connector housing that houses the terminal fitting. The terminal fitting is attached to the electric wire and electrically connected to the core wire of the electric wire. The connector housing is formed in a cylindrical shape or a box shape and accommodates the terminal fitting described above.

  The wire harness having the above-described configuration is routed in an automobile such that the connector is fitted to the connector of the electronic device described above. And a wire harness electrically connects each electric wire and an electronic device via the terminal metal fitting etc. which were mentioned above. The wire harness electrically connects the electronic devices described above according to a predetermined pattern, and supplies necessary signals and electric power to each electronic device.

  The above-described wire harness is provided with a fuse unit (see, for example, Patent Document 1) that cuts off the current flowing through the electric wire when the current exceeds a certain value. The fuse unit includes a fuse holder made of an insulating synthetic resin and a fuse.

  The fuse holder is provided with a connecting portion in which a fuse electrode and an electric connecting portion of a terminal fitting, to which an electric wire is attached, are sequentially stacked on a nut. The connecting portion fixes the above-described fuse and the terminal fitting to which the electric wire is attached to the holder body, and electrically connects the fuse and the terminal fitting.

  The fuse includes a pair of electrodes and a fusible body that electrically connects the electrodes. The fusible material melts when a certain amount of current exceeds a certain value as described above.

The terminal fitting includes a caulking piece for caulking the core wire of the electric wire and a caulking piece for caulking the covering portion in order to fix the electric wire closely.
JP 2003-31108 A

  The terminal fitting of the conventional fuse unit described above has caulked the core of the electric wire and the covering portion. Therefore, the terminal fitting is long in the longitudinal direction of the electric wire. Therefore, the whole fuse holder also tended to increase in size.

  To shorten the terminal fitting, if the caulking piece is not caulked and the fuse unit is attached to an automobile or the like, the core wire is repeatedly bent in the vicinity of the caulking piece caulking this core wire due to vibration, It can be considered to break.

Accordingly, an object of the present invention is to fuse holder more compact, the core wire of the electric wire to be connected to the fuse is to provide a fuse holder and the fuse unit can be prevented from being broken by vibration.

In order to achieve the object by solving the above problems, the fuse holder of the present invention as set forth in claim 1, a box-shaped holder main body, and, provided the pair on the holder main body, take the electrodes and wire fuses connecting part for connecting the biasing only terminal fitting in a fuse holder wherein the terminal fitting, only the core wire of the electric wire with the caulking caulking portion, the holder body, the wire attached to the terminal fitting A locking portion for locking the covering portion, and a terminal locking portion for locking the terminal metal fitting , and the terminal locking portions correspond to the connection portions, respectively, It is provided between the connection portions .

Fuse holder according to the invention as set forth in claim 2 is the fuse holder according to claim 1, wherein the holder body is provided with a bottom wall fitted with the connecting portion, the locking portion is standing from said bottom wall A pair of standing walls provided, and protrusions projecting from surfaces facing each other of the pair of standing walls, and the electric wire is press-fitted between the protrusions and locked to the locking portion. It is characterized by having.

  According to a third aspect of the present invention, there is provided a fuse unit comprising the fuse holder according to the first or second aspect.

According to the fuse holder of the present invention as set forth in claim 1, the holder body includes the locking portion for locking the covering portion of the electric wire, and the terminal locking portion for locking the terminal metal fitting , and the terminal lock. Since the stop portions are respectively provided between the locking portions and the connection portions corresponding to the connection portions, it is possible to prevent the core wire in the vicinity of the connection portions from being repeatedly bent when vibration is transmitted to the electric wire. Further, since the holder body is provided with the locking portion, the terminal fitting does not need to be provided with a caulking piece for caulking the covering portion of the electric wire.

  According to the fuse holder of the present invention described in claim 2, the protrusion is restrained from being displaced in the direction opposite to the direction in which the electric wire locked to the locking portion is press-fitted into the protrusion. The electric wire is surrounded on three sides by a bottom wall of the holder main body and a pair of standing walls standing from the bottom wall. For this reason, the latching | locking part can latch an electric wire reliably.

  According to the fuse unit of the present invention described in claim 3, since the holder main body includes the locking portion for locking the covering portion of the electric wire, when the vibration is transmitted to the electric wire, the core wire in the vicinity of the connecting portion is Repeated bending can be prevented. Further, since the holder body is provided with the locking portion, the terminal fitting does not need to be provided with a caulking piece for caulking the covering portion of the electric wire.

As described above, the present invention according to claim 1 is a terminal for locking a terminal fitting provided between a locking part for locking a covering part of an electric wire and a locking part and a connection part. Even if vibration is transmitted to the electric wire by the locking portion, it is possible to prevent the core wire of the electric wire near the connecting portion from being repeatedly bent. For this reason, it can prevent that the core wire of an electric wire breaks by vibration. Further, since it is not necessary to provide a crimping piece for caulking the covering portion on the terminal fitting, the terminal fitting can be shortened. Therefore, it is possible to reduce the size of the fuse holder.

  According to the second aspect of the present invention, since the three sides are surrounded by the bottom wall and the pair of upright standing walls, it is possible to prevent the electric wires from dropping from the locking portions. For this reason, the latching | locking part can latch an electric wire reliably.

  According to the third aspect of the present invention, even if vibration is transmitted to the electric wire by the engaging portion that engages the covering portion of the electric wire, the core wire of the electric wire near the connecting portion can be prevented from being repeatedly bent. For this reason, it can prevent that the core wire of an electric wire breaks by vibration. Further, since it is not necessary to provide a crimping piece for caulking the covering portion on the terminal fitting, the terminal fitting can be shortened. Therefore, it is possible to reduce the size of the fuse holder.

  An embodiment of a fuse unit according to the present invention will be described below in detail with reference to FIGS.

  As shown in FIGS. 1 to 4, a fuse unit 1 according to an embodiment of the present invention includes a fuse 2, a pair of terminal fittings 3, and a fuse holder 4.

  The fuse 2 has a cylindrical shape, and includes a pair of electrodes 5, a cylindrical portion 6, and a soluble body (not shown) as shown in FIGS. The electrode 5 is made of a conductive metal and is formed in a plate shape. A hole 7 passes through each electrode 5. Of course, the hole 7 is exposed to the outside of the cylindrical portion 6.

  The cylindrical portion 6 is made of an insulating material and is formed in a cylindrical shape with both ends closed. One end of the electrode 5 is positioned in the cylindrical portion 6. The fusible body is made of a conductive metal and is accommodated in the cylindrical portion 6. The fusible body connects one end portions of the pair of electrodes 5 to each other. In the fuse 2 described above, when the current value of the current flowing through one electrode 5, the fusible body, and the other electrode 5 sequentially exceeds a predetermined value, the fusible body is blown. The fuse 2 cuts off the electric current flowing between the electrodes 5 described above by melting the fusible body.

  As for the terminal metal fitting 3, the electric wire 8 is electrically and mechanically connected, respectively. As shown in FIGS. 2 to 4, the electric wire 8 includes a conductive core wire 9 and an insulating covering portion 10. The core wire 9 is configured by twisting a plurality of strands. Each strand is made of a conductive metal. The covering portion 10 is made of an insulating synthetic resin and covers the core wire 9. The core wire 9 is exposed at the end of the electric wire 8.

  Each of the terminal fittings 3 is made of a conductive thick sheet metal. As shown in FIGS. 1 to 4, the terminal fitting 3 includes a caulking portion 11 and an electrical contact portion 12. As shown in FIG. 5, the caulking portion 11 caulks only the core wire 9 exposed from the end of the electric wire 8. The caulking part 11 caulks only the core wire 9 of the electric wire 8 and is electrically and mechanically connected to the electric wire 8.

  The electrical contact portion 12 is continuous with the caulking portion 11. The electrical contact portion 12 is formed in a flat plate shape, and the hole 13 passes therethrough. The planar shape of the electrical contact portion 12 is formed in a short shape. The electrical contact portion 12 of the terminal fitting 3 is overlapped with a nut 14 (to be described later) of the fuse holder 4, and further, the electrode 5 of the fuse 2 is overlapped, and the bolt 15 is screwed into the nut 14, so that the fuse 2 is interposed. Are electrically connected to each other. Further, the electrical contact portion 12 of the terminal fitting 3 is mechanically connected to the fuse electrode 5 by the bolt 15 and the nut 14 described above.

  As shown in FIGS. 1 to 4, the fuse holder 4 includes a holder main body 16, a pair of connection portions 17, a pair of terminal locking portions 18, and a pair of locking portions 21. The holder body 16 includes a plate-like bottom wall 19 and a plurality of peripheral walls 20 erected from the outer edge of the bottom wall 19 and is formed in a box shape. The planar shape of the bottom wall 19 is formed in a short shape. The peripheral wall 20 is erected from the outer edge of the bottom wall 19. The peripheral wall 20 is erected in the same direction from the outer edge of the bottom wall 19. The peripheral walls 20 are opposed to each other at intervals along the width direction of the bottom wall 19.

  The connecting portions 17 are provided at both ends in the longitudinal direction of the holder body 16. The connecting portion 17 includes a nut 14 and a bolt 15 that is screwed into the nut 14. The nut 14 is made of a conductive metal, and the screw hole 14 a is embedded in the bottom wall 19 so as to be exposed in the holder body 16. Since the nut 14 is embedded in the bottom wall 19 of the holder body 16, the connection portion 17 is attached to the bottom wall 19 of the holder body 16.

  The bolt 15 is made of a conductive metal, and integrally includes a screw portion 23 that is screwed into the screw hole 14 a of the nut 14 and a head portion 24 that is continuous with one end portion of the screw portion 23. The head 24 is convex in the outer circumferential direction from the screw portion 23. The bolt 15 has both the electrical contact portion 12 of the terminal fitting 3 and the electrode 5 of the fuse 2 between the head 24 and the nut 14 by screwing the screw portion 23 into the screw hole 14 a of the nut 14. Between.

  In the connecting portion 17 having the above-described configuration, the electrical contact portion 12 of the terminal fitting 3 and the electrode 5 of the fuse 2 are sequentially stacked on the nut 14, and the screw portion 23 of the bolt 15 is screwed into the hole 25 a of the electrode 5. The electrode 5 of the fuse 2 and the electrical contact portion 12 of the terminal fitting 3 are electrically connected to each other and fixed to the holder body 26. Thus, the connection portion 17 electrically and mechanically connects the electrode 5 provided with the hole 7 of the fuse 2 and the electrical contact portion 12 provided with the hole 13 of the terminal fitting 3 to which the electric wire 8 is attached. .

  The terminal locking portions 18 are respectively provided corresponding to the connection portions 17. One terminal locking portion 18 corresponds to one connection portion 17. The terminal locking portion 18 is provided between the connection portion 17 and a standing wall 30 of the locking portion 21 described later. Each terminal locking portion 18 includes a pair of locking pieces 25. The locking piece 25 stands from the bottom wall 19 in the same direction as the peripheral wall 20 and the standing wall 30.

  The pair of locking pieces 25 are arranged at intervals along the width direction of the holder body 16. The locking piece 25 is integrally provided with a standing portion 26 erected from the bottom wall 19 and a locking claw 27 provided at an end of the erected portion 26 on the side away from the bottom wall 19. . The locking claw 27 extends from the standing portion 26 in a direction in which the pair of locking pieces 25 approach each other. The terminal locking portion 18 configured as described above press-fits the terminal fitting 3 between the locking pieces 25 and is positioned between the bottom wall 19 and the locking claw 27 to lock the terminal fitting 3.

  The locking portions 21 are provided corresponding to one connection portion 17 and one terminal locking portion 18, respectively. As shown in FIG. 6, the locking portion 21 includes a pair of standing walls 30 and a protrusion 22 that protrudes from surfaces facing each other of the pair of standing walls 30. The standing wall 30 is erected from the bottom wall 19. The pair of standing walls 30 are arranged along the width direction of the bottom wall 19 with a space therebetween. Each of the standing walls 30 is continuous with the peripheral wall 20. The locking portion 21 press-fits the covering portion 10 of the electric wire 8 attached to the terminal fitting 3 between the protrusions 22 and positions the covering portion 10 between the bottom wall 19 and the protrusion 22 (terminal fitting 3 Lock to the sheath 10 of the wire 8 (at the end of the end). As described above, the locking portion 21 is surrounded by the bottom wall 19 and the pair of standing walls 30 and locked to the covering portion 10 of the electric wire 8 in the vicinity of the terminal fitting 3 (at the terminal near the terminal fitting 3). To do.

  In the fuse unit 1 having the above-described configuration, current flows from the core wire 9 in the one electric wire 8 through the terminal fitting 3 to the one electrode 5 and the fusible body of the fuse 2 in this order. Furthermore, the current passed through the fusible body of the fuse 2 flows to the core wire 9 in the other electric wire 8 through the other electrode 5 and the other terminal fitting 3. Here, when a current of a certain level or more flows, the fusible body of the fuse 2 is blown, so that the fuse unit 1 cuts off an excessive current entering the circuit.

  According to the present embodiment, the fuse unit 1 is provided with the locking portion 21 for caulking the covering portion 10 of the electric wire 8 on the holder main body 16 of the fuse holder 4, and the caulking portion 11 caulks only the core wire 9 in the electric wire 8. Thus, the terminal fitting 3 can be simplified. For this reason, it is not necessary to provide a portion for crimping the covering portion 10 on the terminal fitting 3, and the overall length of the terminal fitting 3 in the longitudinal direction of the electric wire 8 can be shortened. Therefore, the fuse unit 1, that is, the fuse holder 4 can be reduced in size.

  Further, since the fuse unit 1 holds the electric wire 8 by the engaging portion 21 and the terminal engaging portion 18 provided in the holder main body 16, it is possible to prevent the core wire 9 near the connecting portion 17 from being repeatedly bent due to vibration. For this reason, it can prevent that the core wire 9 of the electric wire 8 breaks.

  Since the protrusion 22 of the fuse unit 1 protrudes from the standing wall 30, the press-fitted electric wire 8 is prevented from displacing in the direction opposite to the direction in which it is press-fitted between the protrusions 22. That is, the protrusion 22 makes it difficult to pull out the electric wire 8. Further, the electric wire 8 is surrounded on three sides by the bottom wall 19 and the standing wall 30. For this reason, the latching | locking part 21 hold | maintains the electric wire 8 reliably. Therefore, breakage of the core wire 9 in the vicinity of the connecting portion 17 caused by vibration can be prevented.

  The above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

It is a perspective view which shows the fuse unit which concerns on one Embodiment of this invention. FIG. 2 is an exploded perspective view of the fuse unit shown in FIG. 1. FIG. 2 is a plan view of the fuse unit shown in FIG. 1. It is sectional drawing which follows AA in FIG. FIG. 3 is a sectional view taken along line BB in FIG. 2. It is sectional drawing which follows CC in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fuse unit 2 Fuse 3 Terminal metal fitting 4 Fuse holder 5 Electrode 8 Electric wire 9 Core wire 10 Cover part 11 Caulking part 16 Holder main body 17 Connection part 19 Bottom wall 21 Locking part 22 Projection 30 Standing wall

Claims (3)

Box-shaped holder main body, and, provided the pair in said holder body, the connecting portion for connecting the terminal fitting has attach the electrode and wire fuses in the fuse holder with a
The terminal fitting includes a crimping crimping portion only core wire of the electric wire,
The holder body, and the locking portion for locking the cover portion of the wire attached to the terminal fitting, and a terminal locking portion for locking the terminal fitting and the terminal locking portion, wherein A fuse holder, wherein the fuse holder is provided between the locking portion and the connection portion, corresponding to each connection portion . The holder body is provided with a bottom wall fitted with the connecting portion,
The locking portion is provided with a pair of upright wall erected from the bottom wall, and a projection which projects from opposite surfaces to each other of the pair of upright walls, and
The fuse holder according to claim 1, wherein the electric wire is press-fitted between the protrusions and is locked to the locking portion .   A fuse unit comprising the fuse holder according to claim 1.

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