JP2018073652A - Terminal board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a nut to a nut installation part from being loosed, and eliminate the need of a flexure processing exclusive jig.SOLUTION: A terminal board 10 comprises: a bus bar 30 in which a fastening part 31 having a bolt insertion hole 36 and a relay part 32 orthogonally arranged to the fastening part 31 are connected in an L-shape by a bent part 33; a nut 40 that includes a screw hole 41 provided in an inner peripheral surface, and is arranged so that the screw hole 41 and the bolt insertion hole 36 are coaxial with each other; and a resin part 20 that includes a nut mounting part 22 in which the nut 40 is inserted into a space opening at a fastening part 31 side, and is integrally formed to the relay part 32. A height dimension H1 from a lower surface to an upper surface of the nut 40 is equal to a dimension H2 from a supporting surface 25 that supports the lower surface of the nut 40 to the fastening part 31 in the nut mounting part 22, and a jig part 42 formed in a shape along an inner surface of the bent part 33 is integrally provided on the nut 40.SELECTED DRAWING: Figure 7

Description

  The technique disclosed by this specification is related with a terminal block.

  Conventionally, a current sensor described in, for example, Japanese Patent Application Laid-Open No. 2014-87192 (Patent Document 1) is known as a resin molded product in which a bus bar is insert-molded in a mold member provided with a nut housing portion that accommodates a nut inside. It has been. The bus bar has a bent extension part that is bent at a right angle so as to cover the opening of the nut accommodating part, and between the nut accommodated in the nut accommodating part and the bent extension part of the bus bar, A predetermined clearance is provided. In a state before the bent extension portion is provided, the opening of the nut housing portion is not closed, and the nut is housed inside the nut housing portion through this opening, and then the opening of the nut housing portion is closed. The jig is arranged, and the bending extension is formed by performing right-angle bending with the tip of the jig as the bending center. Thereafter, when the jig is removed, a clearance remains in the portion where the jig is removed.

JP 2014-87192 A

  According to the current sensor, since the bus bar is bent after the nut is accommodated in the nut accommodating portion, the entire periphery of the nut can be covered with a wall, and the nut can be prevented from falling off. There are advantages. However, if the screw part of the bolt is inserted into the bolt insertion hole of the bent extension part and tightened into the screw hole of the nut, the nut will be drawn toward the bent extension part side by the clearance. As a result, the nut tends to loosen with respect to the nut housing portion. However, if the jig is thinned so as to reduce the clearance, the rigidity of the jig is lowered, so that stress is easily applied to the mold member when the bus bar is bent.

  The terminal block disclosed in this specification includes a bus bar in which a fastening part having a bolt insertion hole and a relay part arranged perpendicular to the fastening part are connected in an L shape by a bending part, and an inner peripheral surface. A nut having a provided screw hole, wherein the screw hole and the bolt insertion hole are arranged coaxially, and a nut mounting portion into which the nut is inserted in a space opened to the fastening portion side. And a height of the nut from the lower surface to the upper surface of the nut is a support surface that supports the lower surface of the nut at the nut mounting portion. To the fastening portion, and a jig portion having a shape along the inner surface of the bent portion is provided integrally with the nut.

  According to such a configuration, since the top surface of the nut is easily in contact with the fastening portion of the bus bar when the nut is mounted on the nut mounting portion, the bolt shaft portion is inserted into the bolt insertion hole and tightened into the nut screw hole. At this time, the nut is not pulled toward the fastening portion side. Therefore, loosening of the nut with respect to the nut mounting portion can be prevented.

  Further, since the bus bar can be bent using the jig portion of the nut, it is not necessary to use a dedicated jig for bending. Furthermore, a fastening part can be formed by insert-molding the bus bar in a straight shape without a primary mold, mounting a nut on the nut mounting part, and bending the bus bar to form a bent part. Therefore, the resin part can be formed by one molding, and the manufacturing cost can be reduced by eliminating the need for the primary mold.

The terminal block disclosed by this specification is good also as the following structures.
The said jig part is good also as a structure provided over the upper surface from the lower surface of the said nut.
According to such a configuration, when the bus bar is bent using the jig portion of the nut, a large force is applied to the jig portion, but the jig portion is provided from the lower surface to the upper surface of the nut. Therefore, the force applied to the jig portion can be dispersed over a wide range, and deformation of the jig portion can be prevented.

The side surface of the jig portion may have a configuration along the inner surface of the relay portion.
According to such a structure, since the inner surface of a relay part can be received by the side surface of a jig | tool part at the time of the start of a bending process, it can avoid applying a stress to a resin part directly.

  According to the terminal block disclosed in this specification, it is possible to prevent the nut from loosening with respect to the nut mounting portion, and there is no need to use a dedicated jig for bending.

The perspective view of the terminal block in an embodiment A perspective view of the terminal block showing a state before the nut is mounted on the nut mounting portion. A perspective view of the terminal block showing the state after the nut is mounted on the nut mounting portion Plan view of terminal block showing the state before bending the bus bar Plan view of terminal block showing the state after bending the bus bar AA line sectional view in FIG. BB sectional view in FIG.

<Embodiment>
The embodiment will be described with reference to the drawings of FIGS. The terminal block 10 in the present embodiment is attached to a case of a device (not shown), and relay-connects internal wiring disposed inside the device and external wiring such as a wire harness. The terminal block 10 includes a resin portion 20, a plurality of bus bars 30 that are insert-molded in the resin portion 20, and a plurality of nuts 40 and 50.

  As shown in FIGS. 2 and 3, the resin portion 20 has a hood portion 21 that opens upward, and a plurality of nut mounting portions 22 to which a plurality of nuts 40 are mounted are provided inside the hood portion 21. It has been. Further, as shown in FIG. 7, a nut accommodating portion 23 that accommodates the nut 50 therein is provided at the lower end portion of the resin portion 20. The nut mounting portion 22 is configured to open upward, and the nut 40 is mounted from above, whereas the nut housing portion 23 is configured to open downward, and the nut 50 extends from below to the inside. It is to be accommodated. The nut 40 mounted on the nut mounting portion 22 and the nut 50 housed inside the nut housing portion 23 are arranged orthogonal to each other when viewed from the side.

  As shown in FIG. 4, the nut 40 is in the form of a block having a vertically long rectangular shape in plan view. A screw hole 41 is provided at a position farther from the bus bar 30 than the central portion of the nut 40. Inside the screw hole 41, a female screw (not shown) that can be screwed with a shaft portion of a bolt is formed. The nut mounting portion 22 has a peripheral wall 24 that surrounds the nut 40 from three directions. The peripheral wall 24 has a vertically long gate shape that is continuous along the outer peripheral side surface of the nut 40 and opens upward from the bus bar 30 side. Therefore, the nut 40 is accommodated in the peripheral wall 24 from above.

  As shown in FIG. 7, the bus bar 30 has an L shape as a whole, a pair of upper and lower fastening portions 31, a relay portion 32 that continues upward from the lower fastening portion 31, and an upper fastening portion 31 and a relay portion. 32 and a bent portion 33 disposed between the two. The relay part 32 is arranged to be orthogonal to the upper fastening part 31. Each fastening portion 31 is provided with a bolt insertion hole 36 through which a shaft portion of a bolt (not shown) is inserted. The bolt insertion hole 36 and the screw hole 41 of the nut 40 are arranged so as to be coaxial.

  The bus bar 30 is formed in an L shape by punching a conductive metal flat plate to form an I-shaped bus bar 34 shown in FIG. 6 and bending the I-shaped bus bar 34 at a right angle. It is like that. The I-shaped bus bar 34 includes a pair of upper and lower fastening portions 31 and a relay portion 35 disposed between the fastening portions 31. A portion of the relay portion 35 of the I-shaped bus bar 34 is embedded in the resin portion 20, and the remaining portion of the relay portion 35 (a portion protruding upward from the resin portion 20) is bent at a right angle so that L A bent portion 33 of the character-shaped bus bar 30 is formed.

  Now, the nut 40 of this embodiment has the jig | tool part 42 distribute | arranged to the inner side of the bending part 33 of the bus-bar 30, as shown in FIG. The jig portion 42 functions as a jig for bending the I-shaped bus bar 34 at a right angle, has a shape along the inner surface of the bending portion 33, and is provided integrally with the nut 40. The jig portion 42 is provided from the lower surface to the upper surface of the nut 40, and the side surface of the jig portion 42 has a shape along the inner surface of the relay portion 32. For this reason, the jig part 42 is in surface contact from the inner surface of the bending part 33 to the inner surface of the relay part 32.

  A height dimension H1 (see FIG. 6) from the lower surface to the upper surface of the nut 40 is a dimension H2 (see FIG. 7) from the support surface 25 that supports the lower surface of the nut 40 to the upper fastening portion 31 in the nut mounting portion 22. equal. In other words, the upper fastening portion 31 is in surface contact with the upper surface of the nut 40. For this reason, the nut 40 is in a state where movement in the vertical direction is restricted between the support surface 25 and the upper fastening portion 31 even when a bolt (not shown) is tightened. Further, as shown in FIG. 2, a plurality of protrusions 26 for press-fitting and holding the nut 40 inserted into the nut mounting portion 22 are provided on the inner wall of the nut mounting portion 22.

  The present embodiment is configured as described above, and its operation will be described subsequently. First, the terminal block 10 before bending shown in FIG. 2 will be described. A plurality of I-shaped bus bars 34 are set in a mold (not shown) for molding the resin portion 20. Then, after the mold is closed, the molten resin is injected, the resin is cooled and solidified, and then the mold is opened to form the terminal block shown in FIG. Next, the nuts 40 are inserted into the inner spaces of the nut mounting portions 22 in a press-fit state while the protrusions 26 are crushed, and the nuts 50 are inserted into the inner spaces of the nut housing portions 23 in a press-fit state.

  In this state, as shown in FIG. 6, since the relay portion 35 of the bus bar 34 is in contact with the side surface of the jig portion 42, the portion of the bus bar 34 that protrudes above the nut 40 is placed on the upper surface of the nut 40. When pushed in the clockwise direction, the relay portion 35 is bent at a right angle around the jig portion 42. When the relay portion 35 is bent at a right angle, as shown in FIG. 7, an L-shaped bus bar 30 is formed, and each fastening portion 31 is in contact with the upper surface of each nut 40, and the terminal block shown in FIG. 10 is completed.

  Next, while arranging the bus bar on the wire harness side on the upper surface of each fastening portion 31 and inserting the shaft portion of the bolt into the bolt insertion hole 36 and tightening it into the screw hole 41 of the nut 40, The bus bar 30 of the terminal block 10 is connected to be conductive. Here, since the upper surface of the nut 40 is in contact with the fastening portion 31, the nut 40 is not pulled toward the fastening portion 31 as the bolt is tightened, and the press-fit state of the nut 40 by the protrusion 26 is maintained. The nut 40 does not loosen with respect to the nut mounting portion 22.

  As described above, in the present embodiment, since the top surface of the nut 40 is easily in contact with the fastening portion 31 of the bus bar 30 in a state where the nut 40 is mounted on the nut mounting portion 22, the bolt shaft portion is inserted into the bolt insertion hole 36. Thus, when the nut 40 is tightened into the screw hole 41 of the nut 40, the nut 40 is not pulled toward the fastening portion 31 side. Therefore, loosening of the nut 40 with respect to the nut mounting portion 22 can be prevented.

  Further, since the bus bar 34 can be bent using the jig portion 42 of the nut 40, there is no need to use a dedicated jig for bending. Further, the fastening portion 31 can be formed by insert-molding the bus bar 34 in a straight shape without a primary mold, mounting a nut on the nut mounting portion 22, and bending the bus bar 34 to form the bent portion 33. Therefore, the resin part 20 can be formed by one molding, and the manufacturing cost can be reduced by eliminating the need for a primary mold.

The jig portion 42 may be configured to be provided from the lower surface to the upper surface of the nut 40.
According to such a configuration, when the bus bar 34 is bent using the jig portion 42 of the nut 40, a large force is applied to the jig portion 42, but the jig portion 42 is located on the lower surface of the nut 40. Since the force applied to the jig part 42 can be dispersed over a wide range, deformation of the jig part 42 can be prevented.

The side surface of the jig portion 42 may be configured to have a shape along the inner surface of the relay portion 35.
According to such a configuration, since the inner surface of the relay portion 35 can be received by the side surface of the jig portion 42 at the start of the bending process, it is possible to avoid direct stress on the resin portion 20.

<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings, and includes, for example, the following various aspects.
(1) In the above embodiment, the example in which the fastening portion 31 of the bus bar 30 is in contact with the upper surface of the nut 40 is illustrated, but a slight clearance is formed between the fastening portion 31 and the upper surface of the nut 40. But you can. Similarly, a slight clearance may be formed between the inner surface of the bent portion 33 and the jig portion 42, and a slight clearance is formed between the side surface of the jig portion 42 and the inner surface of the relay portion 32. It may be what is done.

  (2) Although the resin part 20 is formed by one molding without the primary mold in the above embodiment, the primary molded part is formed by the primary mold, and the bus bar 30 and the nut 40 are assembled integrally with the primary molded part. The resin portion may be formed by secondary molding using a core as a core.

  (3) Although the portal-shaped peripheral wall 24 having no wall on the relay part 32 side of the bus bar 30 is illustrated in the above embodiment, it may be a square peripheral wall surrounding the nut 40 over the entire periphery. In this case, a jig part may be provided only on the upper side of the peripheral wall so as to avoid the peripheral wall.

DESCRIPTION OF SYMBOLS 10 ... Terminal block 20 ... Resin part 22 ... Nut mounting part 25 ... Support surface 30 ... Bus bar 31 ... Fastening part 32 ... Relay part 33 ... Bending part 36 ... Bolt insertion hole 40 ... Nut 41 ... Screw hole 42 ... Jig part H1 ... Height dimension from bottom to top of nut H2 ... Dimension from support surface of nut mounting part to fastening part of bus bar

Claims (3)

A bus bar in which a fastening part having a bolt insertion hole and a relay part arranged perpendicular to the fastening part are connected in an L shape by a bending part;
A nut having a screw hole provided in an inner peripheral surface, and the screw hole and the bolt insertion hole arranged coaxially;
A terminal block having a nut mounting portion into which the nut is inserted in a space opened on the fastening portion side, and a resin portion integrally formed with the relay portion;
The height dimension from the lower surface to the upper surface of the nut is equal to the dimension from the support surface that supports the lower surface of the nut to the fastening portion in the nut mounting portion, and the jig forms a shape along the inner surface of the bent portion A terminal block with a portion provided integrally with the nut.   The terminal block according to claim 1, wherein the jig portion is provided from a lower surface to an upper surface of the nut.   The terminal block according to claim 1, wherein a side surface of the jig portion has a shape along an inner surface of the relay portion.

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