JP2011238483A - Bus bar relay stand - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus bar relay stand which can connect two bus bars directly with a together-fastening method and respond even with thermal expansion of the bus bar.SOLUTION: The bus bar relay stand for overlapping two bus bars B and fastening them by a fastening bolt V, includes: a stand body made of a synthetic resin; a nut screwed with the fastening bolt V; a nut housing chamber 28 formed in the stand body; a nut insertion port which is opened to a side part of the stand body and enables insertion of the nut into the nut housing chamber 28; a coming-off prevention engaging surface 29 which prevents the nut from coming off in an axial direction of the fastening bolt V; and a retainer which prevents the nut housed in the nut housing chamber 28 from coming off.

Description

  The present invention relates to a bus bar relay stand.

  2. Description of the Related Art Conventionally, for example, in an electric vehicle, a terminal block described in Patent Document 1 is known as a terminal block that connects a bus bar extending from a power supply device side and a bus bar extending from a motor side. This terminal block is configured such that nuts are received in nut receiving recesses provided at both ends of a base body made of synthetic resin, and both end portions of one relay bus bar are covered above each nut. Since the relay bus bar is fixed to the terminal block by being pressed by a cover or the like, the relay bus bar and thus each nut does not fall off. Then, the relay bus bar of the terminal block and each bus bar extending from the power supply device and the motor are fastened together by bolts to electrically connect the power supply device and the motor.

JP 2004-327184 A

  However, the structure as in Patent Document 1 requires one relay bus bar and two sets of nuts and bolts in order to electrically connect the two bus bars. Therefore, in recent years, a structure has been studied in which two bus bars to be connected to each other are jointly fastened with one bolt for the purpose of cost reduction and the relay bus bar is omitted.

  However, if the relay bus bar is omitted simply as a set of bolts and nuts, the function of preventing the nut from being lifted up by the relay bus bar is also lost. The problem of getting out occurs. However, if a structure is adopted in which the nut is held by press-fitting into the nut housing recess or by insert molding, the position of the nut is fixed, so if a large current flows through the bus bar and the bus bar thermally expands, the nut A force for displacing the nut is applied to the housing recess. When this is repeated, there is a problem that the nut is gradually loosened in the nut housing recess, and the fastening portion of the bus bar is not sufficiently held.

  The present invention has been completed based on the above-described circumstances, and provides a bus bar relay stand that can directly connect two bus bars together and can cope with thermal expansion of the bus bars. With the goal.

  As a means for achieving the above object, the present invention provides a bus bar relay stand for overlapping two bus bars and fastening them with bolts, a base body made of synthetic resin, and a female screw into which the bolts are screwed. And a nut provided with an outer peripheral protruding portion that protrudes from the outer periphery of the female screw portion, and the female screw portion while leaving a gap in the nut body at least in a direction along the longitudinal direction of the bus bar. A nut housing chamber that accommodates the end surface of the base body exposed on the surface of the base body, and an opening in a side portion of the base body that passes through the female thread portion and the outer peripheral protrusion of the nut. A nut insertion opening that allows the nut to be inserted into the accommodation chamber from a direction intersecting the axial direction of the bolt; and the nut provided in the nut accommodation chamber and accommodated through the nut insertion opening. And a shaft movement restricting portion that restricts movement of the nut in the axial direction by engaging the outer peripheral protruding portion, and a base body that is mounted so as to close the nut insertion port and accommodated in the nut accommodating chamber. And a retainer for preventing the nut from coming off.

  According to the bus bar relay stand having such a configuration, the nut in the nut housing chamber is restricted from moving in the axial direction by the shaft movement restricting portion, and the retainer is restricted from dropping off through the nut insertion path. Even in the state before fastening, the nut can be held in the nut receiving recess without dropping off. Further, when the bus bar is fastened, the end face of the female threaded portion of the nut is exposed from the bolt insertion hole of the nut housing chamber, and the nut, the bus bar, and the bolt can be directly brought into contact and fastened together. Further, since the nut is accommodated in the nut accommodating chamber with a gap in the direction along the length of the bus bar, even if the temperature of the bus bar rises due to energization, the gap allows the nut to be displaced and excessive heat. It can cope with the generation of stress.

The following configuration is desirable as an embodiment of the present invention.
The projecting portion may be provided on the side surface of the nut over the entire circumference. According to such a configuration, since the protruding portion is formed over the entire circumference of the nut, a sufficient contact area with the retaining portion can be secured, and the nut can be securely held in the nut receiving recess. it can.

  A corner portion may be provided in the outer peripheral protruding portion, and a detent portion that holds the posture of the nut by contacting the corner portion may be provided in the nut housing chamber. According to such a configuration, when the bolt is fastened to the nut, the nut is not rotated together with the bolt, and the tightening operation can be performed smoothly.

  The base body may be configured such that an insertion portion through which the bolt can be inserted is provided on the surface of the nut housing chamber opposite to the side where the bolt is inserted so as to penetrate the base body. . According to such a configuration, when bolt fastening is performed, the bolt tip portion passes through the insertion portion, whereby interference between the bolt and the base body can be prevented during bolt fastening.

  According to the present invention, it is possible to provide a bus bar relay stand that can directly connect two bus bars in a co-tightening manner and can also cope with thermal expansion of the bus bars.

An exploded perspective view of the bus bar relay stand according to the present embodiment Plan view Side view Bottom view The top view which shows the state which fixed the bus bar relay stand to the fixed part Side view showing a state where the bus bar is fastened together with fastening bolts Rear view Bottom view IX-IX line sectional view of FIG. XX sectional view of FIG. XI-XI line sectional view of FIG.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
The bus bar relay stand of this embodiment is attached to the attachment part P of an apparatus as shown in FIG.5 and FIG.6, for example in an electric vehicle or a hybrid vehicle. And each bus bar B extended from the power supply device which is not shown in figure and the motor which is not shown in figure is arrange | positioned, and each bus bar B is electrically connected by co-fastening with the fastening bolt V (it corresponds to a volt | bolt).
The bus bar relay base includes a base body 20 made of synthetic resin, a metal nut 40, and a synthetic resin retainer 50 that prevents the nut 40 from coming off. In the following description, the vertical direction refers to the vertical direction of FIG. 6 in this embodiment as a reference, and the mounting portion P side of the device is the front side.

As shown in FIGS. 1 and 4, the base body 20 includes a bus bar installation base 21 having a rectangular plate shape, and a pair extending from one side edge on the long side of the bus bar installation base 21 in a direction orthogonal to the bus bar installation base 21. Mounting piece 22. Further, the upper surface of the bus bar installation base 21 is a bus bar installation surface 21A for arranging the bus bar B.
A fixing bolt insertion hole 24 into which the fixing bolt 23 can be inserted is formed at the center of each mounting piece 22, and a metal collar 25 is attached to the fixing bolt insertion hole 24. Then, the base body 20 is fixed to the mounting portion P by inserting the fixing bolt 23 into the collar 25 and screwing it into a screw hole (not shown) of the mounting portion P.

  As shown in FIGS. 1 and 11, the bus bar installation base 21 has a box-shaped protrusion 26 formed at the center of the lower surface opposite to the bus bar installation surface 21 </ b> A. Is provided with a reinforcing wall 27. The reinforcing wall 27 is integrally connected to the lower surface of the bus bar mounting base 21 and the rear surface of the mounting piece 22.

As shown in FIGS. 1 and 11, a nut housing chamber 28 for housing the nut 40 is provided inside the protruding portion 26 with the upper and lower and rear surfaces open. A nut insertion port 30 for inserting a nut 40 into the nut housing chamber 28 is provided on the open surface on the rear side of the nut housing chamber 28.
As shown in FIG. 1, the nut insertion port 30 is provided on the side end surface on the rear side of the protruding portion 26, and the opening direction thereof is orthogonal to the axial direction of the fastening bolt V screwed into the nut 40. Yes.
In addition, a bolt insertion portion 31 (corresponding to the insertion portion) connected to the lower opening is provided on the lower side of the nut housing chamber 28 to prevent the front end of the fastening bolt V from interfering with the base body 20.
On the other hand, as shown in FIGS. 5, 7, and 8, a retainer 50 that closes the nut insertion port 30 is attached to the rear side surface of the protruding portion 26 to prevent the nut 40 inserted into the nut housing chamber 28 from falling off. .

As shown in FIGS. 1 to 4, the retainer 50 has a retainer body 51 having a rectangular plate shape, and a pair of elastic members extending toward the nut insertion port 30 at both ends in the long side direction of the retainer body 51. A frame piece 52 is provided.
As shown in FIGS. 4 and 7, the elastic frame piece 52 engages with a pair of locking projections 32 provided on the lower surface of the protruding portion 26, so that the retainer main body 51 is attached to the peripheral edge portion of the nut insertion port 30. It fixes to the protrusion part 26 so that it may contact | abut.
The retainer body 51 is formed with a pair of positioning ribs 53 extending toward the nut insertion port 30 in a manner orthogonal to the elastic frame piece 52. The positioning rib 53 is inserted into the rib housing chambers 33 provided on both sides of the nut housing chamber 28 when the retainer 50 is mounted, so that the retainer main body 51 is brought into a predetermined position of the nut insertion port 30. invite.

  As shown in FIG. 1, the nut 40 accommodated in the nut accommodating chamber 28 has a female thread part 41 having a cylindrical shape and a bolt fastening hole 41 </ b> A, and a flange 42 projecting from the outer peripheral surface of the female thread part 41. (Corresponding to the outer peripheral protrusion). The flange 42 is formed so as to protrude from the entire circumference of the female screw portion 41 and has a square plate shape as a whole, and the four corners of the flange 42 are corner portions 42A.

On the other hand, as shown in FIGS. 10 and 11, the nut housing chamber 28 includes a female screw housing portion 28 </ b> A for housing the female screw portion 41 and a flange housing portion 28 </ b> B for housing the flange 42. The female screw accommodating portion 28A is located above the projecting portion 26 and is open to the bus bar installation surface 21A of the bus bar installation base 21, and the flange accommodating portion 28B is located below the projecting portion 26 and the female screw accommodating portion. It is formed integrally with 28A.
Also, a female screw insertion path 34 that extends straight from the female screw accommodating portion 28A to the side surface of the protruding portion 26 to which the retainer 50 is mounted is provided in the bus bar installation base 21 (see FIG. 1). The female screw insertion path 34 is formed to have a passage width that is slightly larger than the outer diameter of the female screw portion 41 of the nut 40.
The female screw housing portion 28A has a semicircular inner surface located on the opposite side of the female screw insertion path 34, and the inner diameter dimension of the semicircular portion is slightly larger than the outer diameter dimension of the female screw portion 41. The passage width dimension of the screw insertion path 34 is the same.

  Further, the vertical dimension of the female screw accommodating portion 28A is set slightly shorter than the length dimension of the female screw portion 41 extending upward from the position of the upper surface of the flange 42, as shown in FIGS. As described above, when the female screw portion 41 of the nut 40 is inserted into the female screw housing portion 28A, the end surface of the female screw portion 41 slightly protrudes upward from the female screw housing portion 28A.

On the other hand, as shown in FIGS. 1 and 9, the flange accommodating portion 28 </ b> B is wider than the female screw accommodating portion 28 </ b> A located above and the bolt insertion portion 31 located below, and the protruding portion 26 to which the retainer 50 is attached. It is provided in a form that is open to the side surface, and the shape thereof is formed in a flat rectangular parallelepiped shape corresponding to the flange 42 of the nut 40 in a plan view.
The inner surface of the flange accommodating portion 28B is a rotation preventing portion 35, and when the fastening bolt V is screwed to the nut 40, the corner portion 42A of the flange 42 abuts so that the nut 40 is pulled by the fastening bolt V and does not rotate. To regulate.

  Further, as shown in FIGS. 10 and 11, since the flange accommodating portion 28B is formed wider than the female screw accommodating portion 28A and the bolt insertion portion 31, the inner surface located in the vertical direction of the flange accommodating portion 28B is a nut. A retaining engagement surface 29 corresponding to an axial movement restricting portion with which 40 flanges 42 can abut is provided. When the nut 40 is inserted into the nut housing chamber 28, the nut 40 is brought into contact with the flange 42, and the nut 40 is in the vertical direction of the nut housing chamber 28 (the axial direction in which the fastening bolt is inserted) or more than a predetermined dimension. Regulate not to move.

In addition, since the length dimension of the flange accommodating portion 28B in the direction along the long side of the bus bar mounting base 21 is slightly larger than the width dimension of the flange 42 of the nut 40, the nut 40 is provided in the nut accommodating chamber 28. When the retainer 50 is mounted, a slight gap is formed in the four sides of the flange 42 of the nut 40 as shown in FIG.
On the other hand, as shown in FIG. 1, the nut insertion port 30 for inserting the nut 40 into the nut housing chamber 28 includes an opening on the side surface of the female screw insertion path 34 and an opening on the side surface of the flange housing portion 28B. Are formed integrally, and the female screw insertion path 34 and the flange accommodating portion 28B are slightly larger than the nut 40, so that the opening is slightly larger than the side view shape of the nut 40.

On the other hand, the retainer 50 is provided integrally with the retainer main body 51 on the surface of the retainer main body 51 that contacts the protruding portion 26 when the retainer 50 is attached to the protruding portion 26 so as to block the female screw insertion path 34. ing. The closing portion 54 has a plate shape parallel to the elastic frame piece 52, and the plate pressure dimension thereof is set to be substantially the same as the vertical dimension of the female screw accommodating portion 28A.
The distal end portion of the closing portion 54 is formed in an arc shape that is recessed toward the proximal end side of the closing portion 54, and when the female screw insertion path 34 is closed by the closing portion 54, the distal end portion of the closing portion 54 is female. Along with the screw accommodating portion 28A, a substantially circular bolt insertion hole that is slightly larger than the outer peripheral shape of the female screw portion 41 of the nut 40 is formed (see FIG. 5).

The bus bar relay stand according to the present embodiment has the structure as described above. Next, the procedure for assembling the bus bar relay stand and the method for connecting the bus bars will be described, together with the effects thereof.
First, the nut 40 is fitted into the nut housing chamber 28 provided in the base body 20 so that the female screw portion 41 corresponds to the female screw housing portion 28A and the flange 42 corresponds to the flange housing portion 28B. The nut 40 is inserted until 42 is completely accommodated in the nut accommodating chamber 28.

Next, with the nut 40 inserted into the nut housing chamber 28, the positioning rib 53 of the retainer 50 is fitted into the rib housing chamber 33 to guide the retainer 50 to a predetermined position of the protruding portion 26. When the retainer 50 is mounted on the protruding portion 26 of the base body 20, the elastic frame piece 52 of the retainer 50 rides on the locking protrusion 32 of the protruding portion 26 and bends and deforms outward, so that the retainer main body 51 of the retainer 50 is deformed. Is brought into contact with the side surface of the protruding portion 26, the contact state between the elastic frame piece 52 and the locking projection 32 is released, and the elastic frame piece 52 is locked to the locking projection 32. As a result, the retainer 50 is attached to the protruding portion 26 of the base body 20, and the nut 40 is prevented from coming off so as not to fall off from the nut insertion port 30. At this time, since the flange 42 of the nut 40 is in contact with the retaining engagement surface 29 in the flange accommodating portion 28B, the nut 40 is inserted with the fastening bolt V in the nut accommodating chamber 28. It is held in a state where it is prevented from coming off in the axial direction.
Further, since the vertical dimension of the female screw accommodating part 28A of the nut accommodating chamber 28 is set smaller than the length dimension of the female screw part 41 extending upward from the flange 42, the bus bar of the bus bar installation base 21 is set. From the installation surface 21A, the end surface of the female screw portion 41 of the nut 40 is slightly protruded.

Next, the bus bar relay stand assembled in this way is arranged on the mounting portion P of the device and fixed by the fixing bolt 23. Specifically, the bus bar relay stand is formed by inserting the fixing bolt 23 into the collar 25 of the fixing bolt insertion hole 24 of the mounting piece 22 provided in the base body 20 and screwing the fixing bolt 23 into the mounting portion P of the device (not shown). Is fixed to the mounting portion P.
And it arrange | positions in the state which piled up two bus bars B on the bus-bar installation stand 21 of the base main body 20 fixed to the attaching part P, and fastens together with the fastening bolt V. FIG. Specifically, for example, each bus bar B extending from a power supply device (not shown) and a motor (not shown) from both sides of the long side direction of the bus bar installation table 21 is set along the bus bar installation surface 21A of the bus bar installation table 21 and at the center of the bus bar installation table 21. Two bus bars B are arranged in a stacked state. At this time, the bus bar B is arranged so that the insertion hole B1 provided in the bus bar B and the bolt fastening hole 41A of the female screw portion 41 of the nut 40 are connected.

  Subsequently, the fastening bolt V is passed through the insertion hole B1 of the bus bar B from above, and the fastening bolt V is screwed into the bolt fastening hole 41A of the nut 40 accommodated in the base body 20. At this time, the nut 40 starts to rotate with the fastening bolt V, but the rotation of the nut 40 is restricted by the corner portion 42A of the flange 42 coming into contact with the anti-rotation portion 35 of the flange accommodating portion 28B. Thus, the fastening bolt V can be screwed normally. Thereby, the two bus bars B are fastened together by the nut 40 and the fastening bolt V, and the mutual bus bars B are fastened in an electrically connected state. Since the end surface of the female thread portion 41 of the nut 40 slightly protrudes from the bus bar installation surface 21A of the bus bar installation table 21, the bus bar B arranged on the bus bar installation surface 21A as shown in FIGS. Are fastened in contact with the female thread 41 of the nut 40.

As described above, the bus bar relay stand according to the present embodiment omits the relay bus bar as compared with the conventional type, and the cost can be reduced by reducing the number of bolts and nuts to one set. Further, by holding the flange 42 of the nut 40 in the flange housing portion 28B, the nut 40 can be prevented from falling off in the vertical direction (the axial direction of the fastening bolt).
Further, since the end surface of the female thread portion 41 of the nut 40 slightly protrudes from the bus bar installation surface 21A, the nut 40 and the bus bar B can be brought into a co-tightened state in direct contact, and a creep phenomenon (synthesis) It is possible to cope with the property that the synthetic resin is deformed slowly when a strong pressure is applied to the resin for a long time.
Further, since a slight clearance is provided between the side surface of the nut 40 and the inner side surface of the nut housing chamber 28, a large current flows through the fastened bus bar B, and the bus bar B thermally expands. Even when the bus bar B is displaced in one direction, the nut 40 can move in the nut accommodating chamber 28 with respect to the direction in which the bus bar B extends, so that the bus bar relay stand is not damaged.
In addition, since the base body 20 is provided with the bolt insertion portion 31 below the protruding portion 26, the fastening bolt V of the fastening bolt V is used even when a fastening bolt V having a long dimension penetrating the protruding portion 26 is used. The tip can be prevented from interfering with the base body 20, and the degree of freedom in selecting the fastening bolt V can be increased.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above embodiment, the nut 40 is constituted by the cylindrical female screw portion 41 and the flange 42 protruding from one opening edge portion of the female screw portion 41, but the present invention is limited to such an embodiment. For example, a female screw part may be formed by knocking out a bolt fastening part of the plate nut, and a plate nut having a plate-like part as an outward projecting part may be used.
(2) In the said embodiment, although the internal thread part 41 was made into the cylindrical shape structure, this invention is not restrict | limited to such an aspect, For example, you may comprise in a rectangular tube shape.

(3) In the above embodiment, the flange 42 is configured in a flange shape that protrudes from the outer peripheral surface of the female screw portion 41 over the entire circumference. However, the present invention is not limited to such an aspect. You may comprise the flange 42 in the shape protruded from a part of outer peripheral surface of the internal thread part 41. FIG.
(4) In the above embodiment, the flange housing portion 28B has a depth dimension substantially equal to the one side dimension of the flange 42 of the nut 40, and the flange housing portion 28B opens on the side surface of the base body 20. Is not limited to such a mode. For example, the flange accommodating portion 28B is formed at a deeper (front side) position than the above-described embodiment, and the flange is inserted from the nut insertion port 30 that opens on the side surface of the base body 20. It is good also as a structure which provides the nut insertion path through which the flange 40 passes at the time of mounting | wearing of the nut 40 between the accommodating parts 28B.

20: Stand main body 28: Nut accommodating chamber 29: Retaining engagement surface (shaft movement restricting portion)
30: Nut insertion port 31: Bolt insertion part (insertion part)
35: Non-rotating part 40: Nut 41: Female thread part 42: Flange (periphery protruding part)
42A: Corner 50: Retainer B: Bus bar V: Fastening bolt (bolt)

Claims (4)

A bus bar relay stand for overlapping two bus bars and fastening them with bolts,
A base body made of synthetic resin, a nut having a female screw portion to which the bolt is screwed, and an outer peripheral protruding portion protruding from an outer periphery of the female screw portion, and a nut formed on the base body and at least the nut of the bus bar A nut housing chamber that accommodates in a state in which a gap is left in a direction along the longitudinal direction and an end surface of the female screw portion is exposed on the surface of the base body; A nut insertion port that allows the nut to be inserted into the nut housing chamber from a direction intersecting the axial direction of the bolt by passing the female screw portion and the outer peripheral protruding portion, and the nut housing chamber. A shaft movement restricting portion for restricting movement of the nut in the axial direction by engaging the nut accommodated through the nut insertion port with the outer peripheral protrusion, and the nut insertion port on the base body Bus bar attendant with a retainer for retaining the nut accommodated in the nut accommodating chamber is mounted on Guyo.   The bus bar relay stand according to claim 1, wherein the outer peripheral protruding portion is provided on the side surface of the nut over the entire periphery.   The corner of the outer periphery is provided with a corner, and the nut housing chamber is provided with a detent for holding the posture of the nut by contacting the corner. The bus bar relay stand according to claim 2.   The base body is provided with an insertion portion through which the bolt can be inserted through a surface of the nut housing chamber opposite to the side where the bolt is inserted. The bus bar relay stand according to any one of claims 1 to 3.

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