JP2007234523A - Holding structure of nut for jointly fastening and fusible link unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a holding structure of a jointly fastening nut, capable of simply and surely holding the jointly fastening nut at a proper position. <P>SOLUTION: A terminal 20 is inserted in the terminal insertion hole 11 of a housing 10 from the upper part, the lower end side 20a of the terminal in which a bolt passing hole 21 is formed is made to pass through the lower side of the terminal insertion hole. On the other hand, a nut 30 to jointly fasten the terminal and a counterpart terminal in cooperation with a bolt passed through the bolt passing hole from is inserted from the lower part in a position adjacent to the lower end side of the terminal on the lower side of the terminal insertion hole, and a locking part 22 formed on the lower end side of the terminal is locked to the lower side of the nut. Thereby, the nut is prevented from dropping off to the lower part and coming off to the upper part. In addition, a space 15 to allow deflection of the lower end side of the terminal when the locking part is locked to the lower side of the nut is secured at the position adjacent to the lower end side of the terminal, and a groove 12 for the locking part to pass through is formed on the inner wall surface of the terminal insertion hole. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a holding structure for a terminal fastening nut used at a place where another terminal (for example, an LA terminal) is fastened with a bolt to a terminal attached to a housing, and a fusible link unit employing the structure. About.

  For example, a fusible link unit having a chain-type fuse circuit body as disclosed in Patent Document 1 is used for a power supply circuit mounted on a vehicle. 9 to 14 show examples of the fusible link unit described in Patent Document 1. FIG.

  As shown in FIG. 9, the fusible link unit 100 includes first and second fuse circuit constituent bodies 110 and 120 made of bus bars, and the first and second fuse circuit constituent bodies 110 and 120 with a predetermined distance from each other. And a synthetic resin housing 200 which is assembled by opening the door.

  As shown in FIG. 10, one example (first fuse circuit structure 110) is representative of the fuse circuit components 110 and 120, and each of the fuse circuit components 110 and 120 has a fusible body on the lower edge of the connection plate 111. A plurality of female terminals 112 and bolting terminals 113 connected in a chain through 117, a battery terminal 114 directly connected to one end in the longitudinal direction of the connecting plate 111, and a fusible body 118 at the other end And a common terminal 115 connected to each other. The fusible bodies 117 and 118 have a function in which a low-melting-point metal is caulked and fixed in the middle and melts when a current of a predetermined value or more flows.

  The housing 200 has a circuit body accommodation chamber 201 having an upper surface open at the top, and a plurality of connector housing portions 211 and a plurality of terminal support portions 222 are provided on the lower side thereof. A terminal insertion hole 202 (see FIG. 14) penetrating in the vertical direction is provided between the upper circuit body accommodation chamber 201, the lower connector housing portion 211, and the plurality of terminal support portions 222. The lower end sides of the terminals 112 and 113 of the fuse circuit components 110 and 120 can be inserted into the terminal insertion hole 202.

  The assembly of the fusible link unit 100 will be briefly described. First, the first and second fuse circuit components 110 and 120 are inserted into the circuit body accommodation chamber 201 from above. When the first and second fuse circuit constituent bodies 110 and 120 are inserted into the circuit body housing chamber 201, the connecting plate 111 is disposed inside the circuit body housing chamber 201, and the lower ends of the terminals 112 and 113 are connected to the terminal insertion holes 202. And is set at a predetermined position in the connector housing portion 211 or the terminal support portion 222.

  At this stage, as shown in FIG. 13, the bolt fastening terminal 113 is formed with a bolt through hole 113a on the lower end side and a lance 113b for preventing the terminal from being removed on the upper side. As shown in FIG. 14, the lance 113 b is locked at a predetermined position in the terminal insertion hole 202, and the lower bolt through hole 113 a is positioned at a predetermined position of the terminal support portion 222.

  Further, the common terminals 115 of the first and second fuse circuit components 110 and 120 are in close contact with each other to form an alternator terminal, and the first and second fuse circuit components 110 and 120 are connected via the common terminal 115. Are electrically connected to form a fuse circuit.

  Next, the battery cable terminal is connected to the battery terminal 114, and the alternator cable terminal is connected to the alternator terminal (common terminal 115). Further, as shown in FIGS. 11, 12, and 14, each male terminal of a mating connector (not shown) is connected to each female terminal 112 in each connector housing portion 211, and the bolt terminal 113 is connected to each bolt terminal 113. The LA terminal 280 is connected by the nut 250 and the bolt 290. At this time, the nut 250 is adjacent to the lower end side of the bolt fastening terminal 113 from the lower side of the housing 200 in a state where the nut 250 slides in the groove 224 of the terminal support portion 222 to prevent the nut 250 from rotating. Insert set in position. Each male terminal and each LA terminal 280 of the mating connector are connected in advance to loads (not shown) via cables.

By connecting in this way, the power from the battery and the alternator is distributed and supplied to each load via the fuse circuit of the fusible link unit 100. Further, when the power of the battery decreases, charging is performed by supplying power from the alternator to the battery. Moreover, when a predetermined current or more flows through the fusible bodies 117 and 118 due to a short circuit accident on the load side, the fusible bodies 117 and 118 are melted by heat generation, thereby preventing an accident based on overcurrent.
JP 2004-127698 A

  By the way, in the fusible link unit 100 described above, the bolt fastening terminal 113 and the LA terminal 280 are fastened together with the bolt 290 and the nut 250. At that time, the nut 250 is tightened until the bolt 290 is fastened. Work while holding by hand. Otherwise, it will fall off, but there is a problem that the assembly workability is not good. In addition, the nut 250 can be press-fitted and fixed to the housing 200 in advance, but in such a case, it is necessary to press-fit while aligning the bolt through hole 113a of the bolt fastening terminal 113 and the hole of the nut 250. The work was troublesome.

  In consideration of the above circumstances, the present invention has a holding structure for a nut for tightening that can easily and surely hold the nut for tightening in an appropriate position without the need for complicated labor such as insertion and press fitting, And it aims at providing the fusible link unit which employ | adopted the holding structure.

  According to the first aspect of the present invention, there is provided a holding structure for a terminal fastening nut, wherein a terminal is inserted into a terminal insertion hole of a housing from above, and a lower end side of a terminal having a bolt through hole formed below the terminal insertion hole. A nut for fastening the terminal and the mating terminal together in cooperation with a bolt passed through the bolt through-hole from below at a position adjacent to the lower end side of the terminal below the terminal insertion hole. Is inserted, and the locking portion formed at the lower end of the terminal is locked to the lower side of the nut, thereby preventing the nut from falling downward, and the bolt through hole and the bolt hole position coincide with each other. It is characterized by holding.

  The invention of claim 2 is a holding structure for a terminal co-fastening nut according to claim 1, wherein the locking portion is locked to the lower side of the nut so that the nut is dropped downward. It is characterized by preventing the terminal from coming off upward.

  The invention of claim 3 is the holding structure for a terminal co-fastening nut according to claim 1 or 2, wherein the locking portion is a lance imparted with flexibility to itself. To do.

  According to a fourth aspect of the present invention, there is provided the holding structure for a terminal co-fastening nut according to the first or second aspect, wherein the locking portion is engaged with the lower side of the nut by utilizing the bending of the substrate portion of the terminal. It is the launching convex part which stops.

  A fifth aspect of the present invention is the holding structure for a terminal co-fastening nut according to any one of the first to fourth aspects, wherein the locking portion is located at a position adjacent to the lower end side of the terminal. A space that allows bending of the lower end side of the terminal when locked to the lower side is secured, and a groove through which the locking portion passes is formed on the inner wall surface of the terminal insertion hole. To do.

  A sixth aspect of the present invention is a fusible link unit including the holding structure for a terminal co-fastening nut according to any one of the first to fifth aspects, wherein the housing is used in an in-vehicle power supply circuit. It is a housing of a flexible link unit, and the terminal is a bolt terminal for connecting to a load side connected via a fusible element to a connecting plate for supplying power to a fuse circuit component of the fusible link unit. It is characterized by.

  According to the first aspect of the present invention, since the nut is held by locking the locking portion formed on the lower end side of the terminal to the lower side of the nut, the nut is inserted from below the housing, and the terminal is inserted from above By simply doing this, the nut can be prevented from falling off easily and securely, and the trouble of press-fitting the nut can be eliminated. Further, since the nut is locked by the locking portion provided directly on the terminal, there is no trouble in aligning the terminal and the nut. In addition, since it is only necessary to provide a locking portion below the bolt through-hole, even when the locking portion is formed by cutting and raising (in the case of a lance), a hole (lance hole) generated due to the cutting and raising is also present. , It will be located below the bolting position. Therefore, if the upper terminal part from the bolting position is used as a conductive path in order to flow a large current, it is not necessary to form useless holes (lance holes) in the middle of the conductive path, and the cross section of the conductive path is reduced. Can be avoided as much as possible, and can contribute to suppression of heat generation due to energization.

  According to the second aspect of the present invention, the one locking portion formed on the lower end side of the terminal simultaneously prevents the nut from dropping and the terminal from coming off, so that it is necessary to increase the number of additional locking portions without increasing the number of locking portions. The function can be achieved, and the structure can be simplified. In particular, the latching portion for preventing the terminal from being removed is normally provided, and it is easy to use both by simply changing the position of the latching portion to the lower side of the nut. Can be accommodated by design changes. In addition, even if it is difficult to provide a locking part for retaining the terminal above the bolt through hole due to space constraints, it is only necessary to provide a locking part for nut locking below the bolt through hole. In addition, it is possible to prevent the terminal from coming off while keeping space restrictions.

  According to the invention of claim 3, since the nut is locked by the lance having flexibility in itself, the terminal and the nut can be reliably positioned with a simple configuration.

  According to the invention of claim 4, when the projecting convex portion formed on the terminal gets over the nut and locks to the lower side of the nut, it gets over by utilizing the bending of the board portion of the terminal. The nut can be locked, and the holding force between the nut and the terminal can be increased.

  According to the invention of claim 5, a space allowing the bending of the lower end side of the terminal when the locking portion is locked to the lower side of the nut is secured at a position adjacent to the lower end side of the terminal, and the terminal insertion hole Since the groove through which the locking part passes is formed on the inner wall surface of the, the terminal (lower side) of the terminal is not forcedly bent when the terminal is passed through the terminal insertion hole. It can be passed through the terminal insertion hole. Therefore, the forcible bending does not cause the locking portion (lance) to sag after passing and the locking effect is lowered, and the insertion resistance at the time of inserting the terminal can be reduced. Further, since it is not necessary to provide a passage margin for the locking portion (lance) in the dimension of the terminal insertion hole (the dimension of the portion other than the groove), it is possible to prevent the terminal from being loose.

  When the locking portion (especially the lance) gets over the pre-inserted nut, the locking portion (lance) bends. At that stage, the space allowing the bending becomes the locking portion (lance). ), It is possible to get over the nut by bending the board portion of the terminal even if the locking portion itself does not bend. Therefore, it is possible to prevent an excessive sag from occurring in the locking portion (lance).

  In addition, even when the locking part is a projecting convex part, there is a space allowing bending at the back of the projecting convex part over the nut, so that the board portion of the terminal can be flexed without difficulty. The projecting convex part can get over the nut. Further, when the projecting convex portion passes through the terminal insertion hole, it passes through the groove portion, so that excessive insertion resistance does not occur.

  According to the invention of claim 6, since the above-described holding structure of the nut for fastening is used for a portion for fastening the bolt fastening terminal for connecting the load side of the fusible link unit with the terminal on the other side. The workability at the time can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 is a cross-sectional view of an embodiment in which the present invention is applied to a part of a fusible link unit, FIG. 2 is an enlarged view of a main part (II part of FIG. 1), FIG. 3 is a schematic perspective view of a terminal, and FIG. FIG. 5 is a perspective view showing a relationship between a locking portion of the terminal and a groove formed in the inner wall of the terminal insertion hole.

  In the figure, 10 is a housing of a fusible link unit used in an in-vehicle power supply circuit, and 20 is a load side connection connected via a fusible member to a connecting plate for power supply of a fuse circuit component of the fusible link unit. The bolt fastening terminal 30 is a nut for fastening. The housing 10, the terminal 20, and the nut 30 correspond to the housing 200, the bolt fixing terminal 113, and the nut 250 in the conventional example shown in FIGS.

  As shown in FIGS. 1 and 2, a terminal insertion hole 11 penetrating in the vertical direction is formed in the housing 10. A terminal 20 is inserted into the terminal insertion hole 11 from above, and the lower side of the terminal insertion hole 11. Further, the lower end side 20a of the terminal in which the bolt through hole 21 is formed penetrates.

  At a position adjacent to the lower end side 20a of the terminal on the lower side of the terminal insertion hole 11, the terminal 20 and the other party cooperate with a bolt (corresponding to the bolt 290 in FIG. 14) passed through the bolt through hole 21 from below. A nut 30 for fastening together with a terminal (corresponding to the LA terminal 280 in FIGS. 11 and 14) is inserted, and a locking portion 22 formed on the lower end side of the terminal 20 is on the lower side of the nut 30. By locking, the nut 30 is prevented from dropping downward, and the terminal 20 is prevented from falling upward. The nut 30 is prevented from rotating by sliding the square flange 31 into the insertion groove 16 of the housing 10.

  Further, at the position adjacent to the lower end side 20 a of the terminal that penetrates to the lower side of the terminal insertion hole 11, bending of the lower end side 20 a of the terminal when the locking portion 22 is locked to the lower side of the nut 30 is allowed. A space 15 is secured, and a narrow terminal insertion hole is formed on the inner wall surface of the terminal insertion hole 11 when the groove 12 through which the locking portion 22 passes is provided on the lower end side 20a of the terminal as shown in FIG. 11 is formed so that the lance 22a is flattened while being buckled and the nut 30 cannot be held.

  In this way, when the nut 30 is held by locking the locking portion 22 formed on the lower end side 20a of the terminal 20 to the lower side of the nut 30, the nut 30 is inserted from below the housing 10, and the terminal By simply inserting 20 from above, the nut 30 can be prevented from falling off easily and reliably, so that the trouble of press-fitting the nut 30 can be eliminated. Further, since the nut 30 is locked by the locking portion 22 provided directly on the terminal 20, it is possible to eliminate the trouble of aligning the bolt holes between the terminal 20 and the nut 30.

  In addition, if the single locking portion 22 formed on the lower end side 20a of the terminal 20 prevents the nut 30 from dropping and the terminal 20 from coming off at the same time, the necessary functions can be achieved without increasing the number of additional locking portions. Therefore, the structure can be simplified. In particular, the locking portion 22 for preventing the terminal 20 from coming off is normally provided. By providing the groove 12 in the terminal insertion hole 11, the locking portion 22 can be locked without flattening the protrusion. As shown in FIG. 3, the position of the portion 22 can be changed to the lower side of the nut 30, and can be used for both locking. Therefore, a simple design change can be used. In addition, even when it is difficult to provide a locking portion for retaining the terminal 20 above the bolt through hole 21 due to space restrictions, the nut locking portion 22 is placed below the bolt through hole 21. By providing only on the side, it is possible to prevent the terminal 20 from coming off while keeping space restrictions.

  As the locking portion 22 in this case, the lance 22a provided with flexibility to itself as shown in FIGS. In the case of the lance 22a, it is formed by cutting and raising the board portion of the terminal 20, so that the lance hole 22b remains in the board portion. The position of the lance 22a is below the bolt through hole 21. Therefore, when using the terminal part on the upper side from the bolting position (position of bolt through hole 21) as a conductive path in order to flow a large current, there is no need to form a useless hole (lance hole 22b) in the middle of the conductive path. Therefore, a reduction in the cross section of the conductive path can be avoided as much as possible, which can contribute to suppression of heat generation due to energization.

  That is, in the fuse circuit structure (see FIG. 10), the bolting terminal 20 is connected to the power supply side connecting plate via the fusible member, and the upper portion from the bolt through-hole 21 conducts a large current. Although it becomes a path, heat generation due to a reduction in the cross section can be suppressed by the amount that no extra hole (lance hole 22b) exists in the conductive path.

  FIG. 5 is an operation explanatory diagram when inserting a terminal when a lance 22 a is provided as the locking portion 22.

  At the time of assembly, as shown in FIG. 5A, the lower end side 20a of the terminal 20 is inserted into the terminal insertion hole 11 from the top to the bottom, and the nut 30 is inserted from the bottom to the top. When the lower end side 20a of the terminal passes through the terminal insertion hole 11, the protruding lance 22a easily passes through the groove 12 formed in the inner wall of the terminal insertion hole 11, so that forced forcible bending causes No sagging and insertion resistance is small.

  Then, the lance 22a gets over the nut 30 at the stage of passing through the terminal insertion hole 11, but at that stage, the space 15 allowing bending is present behind the lance 22a. Even if it is not greatly bent, the board portion of the terminal 20 is bent to some extent, so that the nut 30 can be easily overcome. Therefore, it is possible to prevent an excessive sag from occurring in the lance 22a and to increase the locking strength with respect to the nut 30. Further, since it is not necessary to provide a passage allowance for the lance 22a in the dimension of the terminal insertion hole 11 (the dimension of the portion other than the groove 12), it is possible to prevent the terminal 20 from being loose.

  In the above description, the case where the locking portion 22 is the lance 22a has been described. However, in addition to the lance 22a, the lower side of the nut 30 using the bending of the board portion of the terminal 20 as shown in FIGS. The projecting protrusions 22b and 22c may be provided so as to be engaged with each other. FIG. 6 shows an example in which the launching convex portion 22b is indented, and FIG. 7 shows an example in which the launching convex portion 22c is processed by caging.

  When such projecting protrusions 22b and 22c are provided, as shown in FIGS. 8 (a) and 8 (b), the board portion on the lower end side 20a of the terminal 20 is caused by its own elasticity when getting over the nut 30. By projecting toward the space 15 side, the projecting protrusions 22 b and 22 c get over the nut 30 and are locked to the lower side of the nut 30. Therefore, the nut 30 can be locked with a force stronger than that of the lance 22a, and the holding force between the nut 30 and the terminal 20 can be increased.

  Even when the projecting protrusions 22b and 22c are provided, when the projecting protrusions 22b and 22c pass through the terminal insertion hole 11, they pass through the groove 12, so that excessive insertion resistance does not occur. . Further, if the projecting protrusions 22b and 22c have sufficient deformation strength, and the housing 10 is made of a highly elastic material such as nylon, the insertion hole 11 is deformed in the direction of expansion even if the groove 12 is not provided. The projecting protrusion can be inserted, and the locking effect of the present technology can be obtained.

  As described above, by holding the nuts 30 for fastening together with the locking portions 22 (22a, 22b, 22c) formed on the terminals 20, it is possible to improve workability when the fusible link unit is assembled. it can.

It is sectional drawing of the holding structure of the nut for terminal fastening of embodiment of this invention. It is an enlarged view of the II section of FIG. It is a schematic perspective view of the terminal in the holding structure. It is a perspective view which shows the relationship between the latching | locking part of the same terminal, and the groove | channel formed in the inner wall of a terminal insertion hole. FIG. 6 is an explanatory view of the operation when assembling the terminal when the locking portion is a lance, (a) is a sectional view showing a state in the middle of insertion, and (b) is a state where the insertion is completed and the lance is locked to the lower side of the nut. It is sectional drawing which shows the state. It is sectional drawing which shows the other example of the said latching | locking part. It is a figure which shows the further another example of the said latching | locking part, (a) is sectional drawing, (b) is a perspective view. FIG. 9 is an explanatory diagram of the operation when assembling the terminal when the locking portion is a blow-out convex portion, where (a) is a cross-sectional view showing a state in the middle of insertion, and (b) is a bottom view of the nut after the insertion is completed It is sectional drawing which shows the state latched by. It is a disassembled perspective view of the conventional chain-type large current fusible link unit. It is a front view of the fuse circuit structure in the same unit. It is a perspective view which shows the assembly completion state of the unit. It is a longitudinal cross-sectional view of the same state. It is a schematic perspective view of the terminal for bolt fixation in the unit. It is a cross-sectional view of a part of the unit.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Housing 11 Terminal insertion hole 12 Groove 20 Terminal 20a Lower end side 21 Bolt through-hole 22 Locking part 22a Lance 22b, 22c Launching convex part 30 Nut

Claims (6)

  A terminal is inserted into the terminal insertion hole of the housing from above, and the lower end side of the terminal in which the bolt through hole is formed penetrates the lower side of the terminal insertion hole, while the terminal on the lower side of the terminal insertion hole At a position adjacent to the lower end side, from below, a nut for co-tightening the terminal and the mating terminal is inserted in cooperation with the bolt passed through the bolt through hole, and a locking portion formed on the lower end side of the terminal A holding structure for a terminal co-fastening nut, wherein the nut is prevented from falling off by being locked to the lower side of the nut. The holding structure for a nut for fastening terminals according to claim 1,
Holding the nut for terminal tightening, wherein the locking portion is locked to the lower side of the nut, thereby preventing the nut from dropping downward and preventing the terminal from coming off upward. Construction. A holding structure for a nut for fastening terminals according to claim 1 or 2,
A holding structure for a terminal co-fastening nut, wherein the locking portion is a lance imparted with flexibility to itself. A holding structure for a nut for fastening terminals according to claim 1 or 2,
A holding structure for a terminal co-fastening nut, wherein the locking portion is a projecting convex portion that locks to the lower side of the nut by using the bending of the substrate portion of the terminal. It is a holding structure of the nut for terminal joint tightening according to any one of claims 1 to 4,
A space is provided at a position adjacent to the lower end side of the terminal to allow bending of the lower end side of the terminal when the engaging portion is engaged with the lower side of the nut, and the inner wall surface of the terminal insertion hole A holding structure for a terminal co-fastening nut, wherein a groove through which the locking portion passes is formed. A fusible link unit including the holding structure for a terminal tightening nut according to any one of claims 1 to 5,
The housing is a housing of a fusible link unit used in an in-vehicle power supply circuit, and the terminal is connected to a connecting plate for power supply of a fuse circuit component of the fusible link unit via a fusible member. A fusible link unit characterized in that it is a bolt terminal for side connection.

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