JP2011069439A - Fastening structure for fastening screw - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastening structure for fastening a screw having a screw slack preventing function in a screw mounting section in which a screw fastening implement is mounted. <P>SOLUTION: A first plate section 7 with a first through hole 7a for fastening, a second plate section 9 which is arranged so that it may be superimposed on the first plate section 7 through a clearance and has a second through hole 9a for fastening, and a bending section 8 and a butting section 10 which are arranged at locations that they separate from the first through hole 7a for fastening and second through hole 9a for fastening and keep a clearance dimension between the first plate section 7 and second plate section 9 are provided in a screw mounting section 6. Furthermore, a connecting terminal 40 is fixed by fastening the first plate section 7, the second plate section 9, and connecting terminal 40 with a bolt 30 and nut 31 penetrated through the first through hole 7a for fastening and second through hole 9a for fastening. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a screw fastening structure that fixes a member to be fastened by a screw fastening force.

  The screw fastening structure has been conventionally applied to various parts, for example, it is also applied to a terminal fixing portion of a fusible link mounted on a vehicle (see Patent Document 1). A fusible ring to which a conventional screw fastening structure is applied is shown in FIGS.

  11 to 14, the fusible link 100 includes a bus bar 101 made of a conductive material, and an insulating resin portion 110 formed by insert molding the bus bar 101 as an internal component. The bus bar 101 is provided with two connection holes 102 and 103 and a soluble portion 104 (shown in FIGS. 14A and 14B) interposed between the two connection holes 102 and 103. Is provided. A battery connection terminal (not shown) is fixed using one of the connection holes 102 and is directly attached to a battery post (not shown) via the battery connection terminal. A bolt 105 is inserted into the other connection hole 103. The head portion 105 a of the bolt 105 is prevented from rotating by the insulating resin portion 110 and is prevented from coming off from the connection hole 103. A load-side connection terminal (not shown) is fastened with screws using bolts 105.

  In this screw fastening, a load-side connection terminal (not shown) is inserted into the screw portion 105b of the bolt 105, and a nut (not shown) is screwed into the screw portion 105b into which the load-side connection terminal is inserted. The bus bar 101 and the connection terminal on the load side are tightened with the bolt 105 and the nut. Thereby, the connection terminal on the load side is fixed to the fusible link 100. Here, a nut having a spring function is generally used, and screw loosening due to vehicle vibration or the like is prevented by a spring reaction force of the nut.

JP 2009-56992 A

  As described above, in the conventional screw fastening structure, a screw loosening prevention measure is provided on the nut side which is the screw fastener, but a screw loosening prevention measure is provided on the fusible link 100 on the screw mounting portion side. Absent. For this reason, the tightening torque is set high. However, there are cases where only the screw loosening prevention measures on the screw fastener side are not sufficient, and there is a demand for a screw mounting portion with a screw loosening prevention measure.

  Therefore, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a screw fastening structure having a screw loosening prevention function at a screw mounting portion to which a screw fastener is mounted.

  The invention of claim 1 includes a first plate portion having a first fastening insertion hole, a second plate portion disposed so as to overlap the first plate portion with a gap, and having a second fastening insertion hole; A gap holding portion that is disposed at a position spaced apart from the first fastening insertion hole and the second fastening insertion hole, and that holds a gap dimension between the first plate portion and the second plate portion. The tightened member is fastened together with the first plate portion and the second plate portion using a screw fastener that is provided in the first fastening insertion hole and the second fastening insertion hole. The member is fixed.

  The invention of claim 2 is the screw fastening structure according to claim 1, wherein the screw mounting portion is formed by an integral member.

  The invention of claim 3 is the screw tightening fastening structure according to claim 2, wherein the screw mounting portion is configured as a part of a bus bar of a fusible link, and the bus bar has a fusible portion. And

  According to the first aspect of the present invention, the first plate portion and the second plate portion are bent and deformed by the tightening force of the screw fastener, and the return force of the bending deformation always acts on the screw fastener. Screw loosening of the fastener is prevented. From the above, it is possible to provide a screw fastening structure having a screw loosening prevention measure on the screw mounting portion side.

  According to the invention of claim 2, the screw mounting portion can be manufactured with the minimum number of parts.

  According to invention of Claim 3, since the 1st plate part and 2nd plate part of a fusible link become an electricity supply path and an electricity supply path mass increases, the temperature rise by heat_generation | fever can be reduced and an allowable electric current value can be enlarged. . Moreover, since the temperature difference between the location of the first plate portion and the second plate portion and the location of the fusible portion is expanded by reducing the temperature rise of the first plate portion and the second plate portion, the blow-off characteristic can be made quick blow. . Furthermore, since the distance between the first plate portion and the second plate portion and the fusible portion can be reduced by reducing the temperature rise of the first plate portion and the second plate portion, the fusible link can be reduced in size. .

1 is a perspective view of a fusible link according to an embodiment of the present invention. 1 is a front view of a fusible link according to an embodiment of the present invention. FIG. 3 shows an embodiment of the present invention and is a cross-sectional view taken along line AA in FIG. 2. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, where (a) is a perspective view of a bus bar, and (b) is a perspective view of the bus bar viewed from a direction different from (a). 1 shows an embodiment of the present invention and is a front view of a bus bar. FIG. 1 is a bottom view of a bus bar according to an embodiment of the present invention. 1 shows an embodiment of the present invention and is a side view of a bus bar. FIG. It is principal part expanded sectional drawing which shows one Embodiment of this invention and shows the state which fastened the connection terminal to the bus-bar. It is a perspective view of the bus bar which concerns on a modification. It is the perspective view of the bus-bar which concerns on the modification seen from the direction different from FIG. It is a perspective view of a fusible link which shows a conventional example. It is a front view of a fusible link which shows a conventional example. FIG. 13 shows a conventional example and is a cross-sectional view taken along the line BB of FIG. A prior art example is shown, (a) is a perspective view of a bus bar, (b) is a sectional view of the bus bar.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(Embodiment)
1 to 8 show an embodiment in which the screw fastening structure of the present invention is applied to a fusible link. 1 is a perspective view of the fusible link 1, FIG. 2 is a front view of the fusible link 1, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, FIG. b) is a perspective view of the bus bar 2 viewed from a direction different from FIG. 4A, FIG. 5 is a front view of the bus bar 2, FIG. 6 is a bottom view of the bus bar 2, FIG. 7 is a side view of the bus bar 2, and FIG. FIG. 4 is an enlarged cross-sectional view of a main part showing a state where the connection terminal 40 is fastened to the bus bar 2.

  As shown in FIGS. 1 to 3, the fusible link 1 includes a bus bar 2 made of a conductive material, an insulating resin portion 20 formed by insert-molding the bus bar 2 as an internal component, and a detachable attachment to the insulating resin portion 20. A freely soluble portion cover 21 is provided.

  As shown in detail in FIGS. 4 to 7, the bus bar 2 includes a first bus bar portion 3 and a second bus bar portion 4 bent in a direction orthogonal to the first bus bar portion 3. The first bus bar portion 3 is provided with a connection hole 3a. The periphery of the connection hole 3 a is exposed from the insulating resin portion 20. A battery connection terminal (not shown) is fixed using the connection hole 3a, and is directly attached to a battery post (not shown) via the battery connection terminal.

  The second bus bar portion 4 is provided with a fusible portion 5 and a screw mounting portion 6 continuously thereto. The screw mounting portion 6 includes a first plate portion 7 arranged in the same plane continuously with the fusible portion 5, a bent portion 8 bent from one end of the first plate portion 7, and the bent portion 8. The second plate portion 9 is connected to the first plate portion 7 so as to overlap the first plate portion 7 with the gap dimension d therebetween, and the second plate portion 9 is cut, and the cut portion is located on the first plate portion 7 side. And a butting portion 10 whose front end surface is in contact with the first plate portion 7, and a plate opening prevention claw portion that extends from the second plate portion 9 and is folded at the edge of the first plate portion 7. 11. The screw mounting portion 6 is formed from an integral member by bending. The first plate portion 7 and the second plate portion 9 are provided with a first fastening insertion hole 7a and a second fastening insertion hole 9a at the same position. The bent portion 8 and the abutting portion 10 are positioned away from the first fastening insertion hole 7a and the second fastening insertion hole 9a, specifically, outside the range where the head 30a of the bolt 30 contacts. The gap holding portion is arranged at a position and holds the gap dimension d between the first plate portion 7 and the second plate portion 9 so as not to be narrowed. The plate opening blocking claw portion 11 holds the gap dimension d between the first plate portion 7 and the second plate portion 9 so as not to widen.

  The bolt 30 which is one of the screw fasteners has a screw portion 30b inserted into the second fastening insertion hole 9a and the first fastening insertion hole 7a from the second plate portion 9 side. The head 30a of the bolt 30 is prevented from rotating by the insulating resin portion 20, and is prevented from coming off from the fastening insertion holes 7a, 9a. The front end side of the screw part 30 b of the bolt 30 protrudes from the first bus bar part 3.

  As shown in FIGS. 1 and 4A, the screw fastener is a bolt 30 fixed to the fusible link 1 and a nut 31 to be screwed into the bolt 30, and the bolt 30 and the nut 31 are used. The connecting terminal 40 on the load side, which is a member to be fastened, is fixed. The nut 31 is integrally provided with a spring washer portion 31a.

  Next, the fixing operation of the connection terminal 40 on the load side will be described. The load-side connection terminal 40 is inserted into the threaded portion 30b of the bolt 30 protruding from the bus bar 2, and then the nut 31 is screwed into the threaded portion 30b of the bolt 30. Then, as shown by the phantom line in FIG. 8, between the first plate portion 7 and the second plate portion 9 that are arranged in parallel with a predetermined gap dimension d therebetween, due to the fastening force of the bolt 30 and the nut 31, As shown by a solid line in FIG. 8, the first plate portion 7 and the second plate portion 9 are bent and deformed in a direction approaching each other. Specifically, since the gap between the first plate portion 7 and the second plate portion 9 is held by the bent portion 8 and the abutting portion 10, the peripheral portion of the first fastening insertion hole 7 a of the first plate portion 7. And the second plate portion 9 is bent and deformed in a direction in which the vicinity of the second fastening insertion hole 9a approaches. Since this bending return force always acts on the bolt 30 and the nut 31, screw loosening of the bolt 30 and the nut 31 is prevented. Therefore, the screw fastening structure having the screw loosening prevention function can be provided to the fusible link 1. Further, since the nut 31 has the spring washer portion 31a, the spring reaction force of the spring washer portion 31a always acts on the bolt 30 and the nut 31. This also prevents the bolt 30 and the nut 31 from loosening. That is, since a screw loosening prevention measure is applied to both the screw mounting portion side and the screw fastener side, a strong screw loosening prevention effect can be obtained.

  Since the screw mounting portion 6 is formed of an integral member, it can be manufactured with a minimum number of parts.

  The screw mounting portion 6 is configured as a part of the bus bar 2 of the fusible link 1, and the bus bar 2 has a soluble portion 5. Therefore, since the first plate portion 7 and the second plate portion 9 of the fusible link 1 serve as a current path and the mass of the current path increases, the temperature rise due to heat generation can be reduced and the allowable current value can be increased. Further, since the temperature difference between the first plate portion 7 and the second plate portion 9 and the fusible portion 5 is expanded by reducing the temperature rise of the first plate portion 7 and the second plate portion 9, the fusing characteristics Can be quick blow. Furthermore, since the temperature L of the first plate portion 7 and the second plate portion 9 is reduced, the distance L between the first plate portion 7 and the second plate portion 9 and the fusible portion 5 can be reduced. The Bulllink 1 can be reduced in size.

  In this embodiment, the screw fastener is the bolt 30 and the nut 31, but may be a single screw.

  In this embodiment, the nut 31 has a spring function. However, even if a nut 31 having no spring function is used, the screw fastener can be prevented from loosening.

(Modification of bus bar)
9 and 10 show a modified example of the bus bar 2A of the embodiment, FIG. 9 is a perspective view of the modified bus bar 2A, and FIG. 10 is a perspective view of the modified bus bar 2A viewed from a direction different from FIG. It is.

  12 and 13, the bus bar 2A of the modified example is different in position of the bent portion 8 from that of the above-described embodiment, and accordingly the positions of the abutting portion 10 and the plate opening prevention claw portion 11 are different. Has been changed. That is, in the said embodiment, the bending part 8 is provided in the side end of the 1st plate part 7, and the bending part 8 is provided in the lower end of the 1st plate part 7 in the modification.

  Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same components and the description thereof is omitted.

  Even the fusible link using the bus bar 2 </ b> A of this modified example can provide the same operation and effect as the above embodiment.

DESCRIPTION OF SYMBOLS 1 Fusible link 2 Bus bar 5 Soluble part 6 Screw mounting part 7 1st plate part 7a 1st insertion hole 8 Bending part (gap holding part)
9 2nd plate part 9a 2nd fastening insertion hole 10 Abutting part (gap holding part)
30 bolts (screw fasteners)
31 Nut (screw fastener)

Claims (3)

A first plate portion having a first fastening insertion hole; a second plate portion disposed so as to overlap the first plate portion with a gap and having a second fastening insertion hole; and the first fastening insertion. A gap holding portion that is disposed at a position spaced from the hole and the second fastening insertion hole, and that holds a gap dimension between the first plate portion and the second plate portion, is provided in the screw mounting portion;
The member to be fastened is fixed by tightening the member to be fastened together with the first plate portion and the second plate portion using a screw fastener passed through the first fastening insertion hole and the second fastening insertion hole. Screw fastening structure characterized by that. The screw fastening structure according to claim 1,
A screw fastening structure, wherein the screw mounting portion is formed of an integral member. The screw fastening structure according to claim 2,
The screw mounting structure is characterized in that the screw mounting portion is configured as a part of a bus bar of a fusible link, and the bus bar has a fusible portion.

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