JP2011076886A - Terminal connection structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely eliminate slanted fastening of a bolt. <P>SOLUTION: The terminal connection structure is structured of a terminal group consisting of an equipment-side terminal 21 connected to an equipment side and a wire-side terminal 32 connected to a wire side, a terminal block 15 fixed to an equipment-side case 20 with the terminal group arranged superposed, a nut 40 mounted on the terminal block 15 in an anti-turning state, a bolt 50 screwed with the nut 40, a fixing washer 53 fitted at the bolt 50, and for fastening the terminal group to the terminal block 15 by pressing down the terminal group to the nut 40 accompanying tightening of the bolt 50, and an induction hole 14A capable of being screwed to the bolt 50 further at this side in a tightening direction of the bolt 50 than the nut 40, for inducing the bolt 50 toward the nut 40 to be screwed by tightening the bolt 50. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a terminal connection structure.

  Conventionally, as a terminal connection structure using a bolt, for example, the one described in Patent Document 1 below is known. In this device, a nut is provided on a terminal block, and a bolt is fastened to the nut, whereby the electric wire side terminal and the equipment side terminal are bolted. In such a bolt fastening structure, there is a case where a so-called oblique fastening in which the bolt is fastened in an oblique direction with respect to a normal fastening direction may occur. When the diagonal tightening occurs, the terminals are poorly connected and connection reliability is lowered.

  Therefore, as described in Patent Document 2 below, there is known one that can detect oblique tightening by attaching a cover after bolt tightening. However, this does not improve the bolt fastening method itself and does not fundamentally solve the problem of oblique fastening.

  In that respect, the one described in Patent Document 3 below is formed by raising a bolt guiding portion above the bolt fastening portion, and by forming the inner peripheral surface of this bolt guiding portion in a tapered shape so that the bolt is on the nut side. A taper surface is formed to guide the bolt, and the bolt is guided in a normal tightening direction by the taper surface. This prevents the bolts from being obliquely tightened.

JP 2006-4733 A JP 2003-9351 A JP 2000-332446 A

  However, in the above-mentioned Patent Document 3, it is necessary to manually push the bolt from the position where the bolt is guided by the tapered surface to the position where the bolt starts to be screwed into the nut, and inadvertent force is applied to the bolt during this time. Therefore, there is a risk that the bolts may be tightened obliquely.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to reliably eliminate oblique tightening of bolts.

  The terminal connection structure of the present invention includes a terminal group consisting of a terminal connected to the device side and a terminal connected to the electric wire side, a terminal block fixed to the device-side case and overlaid with the terminal group, and a terminal A nut assembled in a state that it is locked to the base, a bolt that is screwed to the nut, and a bolt that is provided on the bolt, and by pressing the terminal group against the nut as the bolt is tightened, the terminal group becomes the terminal block A structure having a holding surface to be fastened, and a guide hole that can be screwed to the bolt in front of the nut in the tightening direction of the bolt, and that guides the bolt to the nut by tightening the bolt It has the characteristics in that place.

  According to such a configuration, the bolt can be guided to the nut and screwed by tightening the bolt screwed into the guide hole. In other words, since the bolt starts to be screwed into the nut while maintaining the state where the bolt is guided by the guide hole, the bolt can be surely eliminated from being obliquely tightened.

The following configuration is preferable as an embodiment of the present invention.
The bolt includes a large-diameter portion that is screwed into the guide hole, and a small-diameter portion that is smaller in diameter than the large-diameter portion and is not screwed into the guide hole. The large-diameter portion passes through the guide hole. A configuration may be adopted in which tightening of the bolt is completed in a state where the small diameter portion is inserted into the guide hole.
In a state where the large diameter portion is screwed into both the guide hole and the nut, the interval L1 between the guide hole and the nut is equal to an integral multiple of the pitch of the thread formed in the large diameter portion. Here, when the distance L1 does not coincide with the distance L2 between the guide hole and the nut in the natural state, stress is applied to the guide hole in the axial direction of the bolt. In that respect, according to the above configuration, since the small-diameter portion is inserted into the guide hole when the tightening of the bolt is completed, no stress is applied to the guide hole.

A fixing washer is attached and fixed between the induction hole and the terminal block in the bolt screwed into the induction hole, and the surface of the fixed washer facing the nut may be a pressing surface.
According to such a configuration, the diameter dimension of the bolt can be made the same in the portion screwed into the guide hole and the portion screwed into the nut. A fixing washer is attached and fixed by screwing a bolt into the guide hole and attaching the fixed washer to the bolt protruding from the guide hole to the nut side.

A device-side housing for fixing the terminal block to the device-side case may be provided, and the device-side housing may be configured to open between the guide hole and the terminal block in a direction crossing the bolt tightening direction. Good.
According to such a configuration, since the space between the guide hole and the terminal block in the device-side housing is opened in a direction intersecting with the tightening direction of the bolt, an advantage that a fixed washer can be easily attached to the bolt from this opening. There is.

It has a bolt guide part that constitutes a guide hole, and this bolt guide part is arranged between the nut and the head part of the bolt, and when the bolt is completely tightened, the bolt head part is the bolt guide part. It is good also as a structure which is non-contact.
According to such a configuration, the bolt head does not come into contact with the bolt guiding portion when the bolt tightening is completed, so that no stress is applied to the bolt guiding portion.

It is good also as a structure by which the elastic member which supports a nut so that a nut is loosely mounted is attached to the nut accommodating part which accommodates a nut in a terminal block.
According to such a configuration, the position of the bolt can be adjusted by bending and deforming the elastic member even when the nut center is not disposed in the bolt tightening direction.

The terminal block is equipped with a nut retainer that prevents the nut assembled to the terminal block from being removed, and one terminal of the terminal group is fastened to the terminal block while retaining the nut retainer. Also good.
According to such a configuration, the nut retainer is prevented from coming off by fastening one terminal to the terminal block, so that the nut can be prevented from coming off double by the nut retainer and the one terminal.

  According to the present invention, it is possible to reliably eliminate the oblique tightening of the bolt.

Perspective view of device side connector and shield connector The perspective view which showed the state by which the apparatus side connector was attached to the apparatus side case Front view showing the bolt in the middle of tightening Front view showing the bolts tightened AA line sectional view in FIG. BB sectional view in FIG. Sectional view showing how a fixed washer is attached and fixed to the large diameter part of the bolt

<Embodiment>
An embodiment of the present invention will be described with reference to the drawings of FIGS. In the terminal connection structure in this embodiment, as shown in FIG. 1, the case where the apparatus side connector 10 and the electric wire side connector 30 are connected is illustrated. The device-side connector 10 is formed integrally with a device (not shown) such as an inverter for an automobile, and this device includes a device-side case 20 that houses a device body as shown in FIG. It has been configured. The device-side case 20 is made of metal and is fixed to the body (not shown) of the automobile.

  The device-side connector 10 has a device-side housing 11 made of synthetic resin. On both side surfaces of the device-side housing 11, attachment portions 17 for the device-side case 20 are formed so as to protrude. Bolt holes are formed through the mounting portion 17, and bolts (not shown) are inserted into the bolt holes and tightened into the device-side case 20, whereby the device-side connector 10 is fixed to the device-side case 20. Has been. Further, as shown in FIG. 5, an attachment hole 25 is formed through the device side case 20, and the electric wire side connector 30 is connected to the device side connector 10 through the attachment hole 25.

  The electric wire side connector 30 has an electric wire side housing 31 made of synthetic resin. As shown in FIG. 1, the electric wire side housing 31 includes a horizontally long oval fitting portion 33, and a plurality of electric wire side terminals 32 are mounted inside the fitting portion 33. The tip of each electric wire side terminal 32 is mounted so as to protrude forward from the fitting surface of the fitting portion 33, and a bolt insertion hole 34 is formed through the protruding portion.

  A mounting groove 33A is provided around the outer peripheral surface of the fitting portion 33, and the seal ring 80 is fitted into the mounting groove 33A. As shown in FIG. 5, the seal ring 80 is in close contact with both the mounting groove 33 </ b> A and the inner peripheral surface of the mounting hole 25, and the device side case 20 is interposed between the mounting hole 25 and the fitting portion 33. It restricts the ingress of water into the inside of the. In addition, a partition wall 35 is formed between the adjacent wire side terminals 32 on the fitting surface of the fitting portion 33 so as to protrude forward, and the wire side terminals 32 are brought into contact with each other by the partition wall 35 and are short-circuited. To be regulated.

  A metal shield shell 36 is mounted at a position covering the electric wire side housing 31. A mounting portion 37 is formed over the entire periphery of the shield shell 36 at the edge facing the device-side case 20. Bolt holes are formed through the mounting portion 37, and bolts (not shown) are inserted into the bolt holes and tightened into the device-side case 20, so that the shield shell 36 is attached to the device-side case 20. Are connected and fixed so that they can conduct electricity.

  A braided wire (not shown) that collectively covers a plurality of wires (not shown) is crimped and connected to the cylindrical main body 38 that covers the electric wire side housing 31 in the shield shell 36 along the conductive path. It has become. The crimping is performed by arranging a caulking ring (not shown) so as to cover the braided wire and caulking the caulking ring to the main body portion 38.

  As shown in FIGS. 1 and 2, the device-side housing 11 has a substantially square block shape. Inside the device-side housing 11, a plurality of terminal accommodating portions 12 are provided in the inner and outer directions of the device-side case 20. It is formed through. Each terminal accommodating portion 12 is partitioned by a partition wall 13. In the device-side housing 11, a portion constituting the ceiling surface of each terminal accommodating portion 12 is a bolt guiding portion 14, and a portion constituting the bottom surface side of each terminal accommodating portion 12 is a terminal block 15.

  An electric wire side terminal 32 can enter the inside of the terminal accommodating portion 12. For this reason, when the fitting portion 33 is fitted into the mounting hole 25, the electric wire side terminal 32 enters the inside of the terminal accommodating portion 12. The partition wall 13 is formed with a through hole 13 </ b> A that accommodates the partition wall 35 of the electric wire side housing 31. For this reason, as shown in FIG. 2, the partition wall 35 is accommodated in the through hole 13 </ b> A in a state in which the fitting portion 33 is fitted in the attachment hole 25.

  As shown in FIG. 5, the terminal block 15 is provided with a nut accommodating portion 16 that accommodates the nut 40. The nut housing portion 16 is configured to open to the inner side of the device-side case 20, and the nut 40 is attached to the nut housing portion 16 through this opening. The nut 40 is mounted in a state in which the nut 40 is prevented from rotating inside the nut housing portion 16.

  In addition, a flexible cushion material 60 is attached to the inner wall surface of the nut housing portion 16 in a range from the bottom surface side to the side surface side of the nut 40. As a result, the nut 40 is supported so as to be free to move inside the nut housing portion 16 as the cushion material 60 is bent and deformed. Further, a nut retainer 70 is attached to a portion (hereinafter referred to as an opening) that opens to the inside of the device-side case 20 in the nut housing portion 16. The nut retainer 70 is held in the opening of the nut accommodating portion 16 by holding means (not shown), thereby preventing the nut 40 from coming off.

  A device-side terminal 21 is mounted on the terminal block 15 (a portion facing the bolt guiding portion 14). As shown in FIG. 5, the device-side terminal 21 has a wire-side connection portion 21 </ b> A formed in a substantially U-shape so as to sandwich the terminal block 15 from the vertical direction, and a device-side connection that extends downward from the terminal block 15. The unit 21B is integrally provided. A bolt insertion hole 22 is formed through the electric wire side connection portion 21A, and a bus bar connection hole 23 is formed through the device side connection portion 21B. A device-side bus bar connected to the device is bolted to the bus bar connection hole 23.

  A lance 15 </ b> A that can be bent in the vertical direction is formed below the terminal block 15. The lance 15 </ b> A has a form that protrudes in a cantilevered manner toward the inside of the device-side case 20. A locking projection 15B protruding downward is formed at the tip of the lance 15A. The locking projection 15B is fitted in a locking hole 24 formed through the lower surface of the electric wire side connecting portion 21A and locked in the horizontal direction. For this reason, the device-side terminal 21 attached to the terminal block 15 is restricted from being detached from the terminal block 15 when the locking projection 15B is locked in the locking hole 24.

  Now, as shown in FIG. 5, a guide hole 14A is formed through the bolt guide portion 14, and a female screw is formed on the inner peripheral surface of the guide hole 14A. A bolt 50 can be screwed into the guide hole 14A. The bolt 50 includes a head portion 51 and a shaft portion that protrudes downward from the head portion 51. The shaft portion includes a small-diameter portion 54 in which a male screw is not formed and a large diameter in which a male screw is formed. Part 52. The small diameter portion 54 is formed to have a smaller diameter than the large diameter portion 52 and is disposed between the head 51 and the large diameter portion 52. A fixed washer 53 is attached to the large-diameter portion 52 so as not to rotate in the middle of the large-diameter portion 52. The large diameter portion 52 can be screwed into the guide hole 14A in a vertical posture extending in the axial direction of the guide hole 14A.

  As shown in FIG. 7, a notch 55 is provided around the large diameter portion 52 at a position where the fixed washer 53 is mounted, and an engagement shaft 56 having a circular cross section is formed by providing the notch 55. Has been. On the other hand, the fixing washer 53 is formed with an engaging recess 57 that can accommodate the engaging shaft 56, and the opposing portion at the opening edge of the engaging recess 57 is an engaging protrusion 58. For this reason, the fixed washer 53 engages the engaging shaft 56 with the engaging shaft 56 after engaging the large diameter portion 52 with the guide hole 14 </ b> A and locks both engaging protrusions 58 with the engaging shaft 56. By doing so, it is attached and fixed substantially non-rotatably to the large diameter portion 52.

  On the other hand, as shown in FIG. 5, the device side terminal 21 and the wire side terminal 32 are arranged in the order from the bottom on the upper part of the terminal block 15, and the bolt insertion hole 22 and the wire of the device side terminal 21 are overlapped. The bolt insertion holes 34 of the side terminals 32 are arranged in alignment in the vertical direction. Further, the screw hole 41 of the nut 40 is also arranged in alignment with the bolt insertion holes 22 and 34 in the vertical direction. Therefore, by arranging the guide hole 14A so as to align with the bolt insertion holes 22 and 34 in the vertical direction, the large diameter portion 52 passes through the bolt insertion holes 22 and 34 as the bolt 50 is tightened. The nut 40 is screwed into the screw hole 41.

  Here, when the screwing hole 41 of the nut 40 is displaced with respect to the large diameter portion 52 of the bolt 50, that is, the axis passing through the axis of the screwing hole 41 of the nut 40 in FIG. When the axis passing through the axis of the 50 large-diameter portion 52 is P1, and P1 and P2 are displaced in the radial direction, the tapered guide surface 52A formed at the tip of the large-diameter portion 52 Comes into sliding contact with the opening edge of the screwing hole 41, and the nut 40 moves in the horizontal direction and is guided to the proper fastening position. Further, since the bolt 50 is guided in the vertical direction by the guide hole 14A and enters the screwing hole 41 of the nut 40 in a vertical posture, the bolt 50 is not obliquely tightened with respect to the nut 40. At this time, since the tip of the large diameter portion 52 starts to be screwed into the screw hole 41 of the nut 40 in a state where the large diameter portion 52 is screwed into the guide hole 14A, the bolt 50 is obliquely tightened with respect to the nut 40. Can be regulated with certainty.

  However, when the large-diameter portion 52 is screwed at two locations of the nut 40 and the guide hole 14A, the interval between the nut 40 and the guide hole 14A is determined based on the pitch of the thread of the large-diameter portion 52. It is conceivable that stress is applied to the bolt guiding portion 14 in the tightening direction of the bolt 50. In this regard, in this embodiment, when the tightening of the bolt 50 is completed, the large diameter portion 52 passes through the guide hole 14A and the small diameter portion 54 enters the guide hole 14A. Can be released. That is, the tightening of the bolt 50 is not completed while the large-diameter portion 52 is screwed at the two positions of the guide hole 14A and the screwing hole 41.

  Further, when the head 51 of the bolt 50 comes into contact with the bolt guiding portion 14 before the bolt 50 is completely tightened, stress is applied to the bolt guiding portion 14 in the tightening direction of the bolt 50. On the other hand, in this embodiment, since the head 51 of the bolt 50 is set so as not to contact the bolt guiding portion 14 when the tightening of the bolt 50 is completed, the bolt guiding portion 14 is the head of the bolt 50. The portion 51 is not subjected to stress. When the tightening of the bolt 50 is completed in this way, the terminals 21 and 32 are sandwiched between the lower surface of the fixed washer 53 and the upper surface of the nut 40 and are bolted to the terminal block 15. In the present embodiment, the lower surface of the fixed washer 53 corresponds to the “pressing surface” in the present invention.

  The present embodiment is configured as described above, and its operation will be described subsequently. First, the device-side connector 10 and the wire-side connector 30 are fixed to the device-side case 20, and the device-side terminal 21 and the wire-side terminal 32 are arranged over the terminal block 15 via the mounting holes 25. Next, the large-diameter portion 52 of the bolt 50 is screwed into the guide hole 14A of the bolt guiding portion 14 in a vertical posture so that the tip of the large-diameter portion 52 protrudes below the bolt guiding portion 14 by a predetermined dimension. Then, the fixed washer 53 is attached to the notch 55 of the large diameter portion 52. From this point, when the bolt 50 is tightened, the tip of the large diameter portion 52 passes through both the bolt insertion holes 22 and 34, and the guide surface 52 </ b> A contacts the opening edge of the screwing hole 41 of the nut 40. When the axis of the screw hole 41 is arranged coaxially with the axis of the large diameter portion 52 by the guide surface 52A, the large diameter portion 52 starts to be screwed into the screw hole 41.

  Since the large-diameter portion 52 starts to be screwed into the screw hole 41 of the nut 40 in a state of being screwed into the guide hole 14A, it is possible to reliably avoid the oblique tightening of the bolt 50. When the bolt 50 is further tightened, the lower surface of the fixed washer 53 comes into contact with the upper surface of the device-side terminal 21, and both the terminals 21 and 32 are sandwiched between the nut 40 and the fixed washer 53. The terminals 21 and 32 are connected so as to be conductive. When the tightening of the bolt 50 is completed, the small diameter portion 54 is disposed in the guide hole 14 </ b> A, and the head 51 of the bolt 50 is not in contact with the bolt guide portion 14. There is no stress in the tightening direction.

  In addition, since the terminal housing portion 12 that opens to the inside of the device-side case 20 is formed in the device-side housing 11, it is easy to attach the fixed washer 53 and it is easy to check the connection state of both terminals 21 and 32. Further, since the head 51 of the bolt 50 is not in contact with the bolt guiding portion 14 at the time when the tightening of the bolt 50 is completed, it can be controlled that stress is applied to the bolt guiding portion 14. Further, since the large diameter portion 52 is detached from the guide hole 14A and the small diameter portion 54 is disposed in the guide hole 14A when the tightening of the bolt 50 is completed, the large diameter portion 52 is screwed in two places. Can be avoided. Also by this, it can control that stress is applied to the bolt guidance part 14.

  Further, since the cushion material 60 is arranged around the nut 40, the nut 40 can be supported so as to be freely movable, and the nut 40 can be moved to a normal fastening position as the bolt 50 is tightened. In addition, since the nut retainer 70 is prevented from being detached by the device side terminal 21 when the bolt 50 is completely tightened, the nut 40 is retained by the nut retainer 70 and the device side terminal 21 in a double manner. Can do.

<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) Although the small diameter portion 54 is provided so that the bolt 50 is not screwed at two places in the above embodiment, according to the present invention, the bolt 50 is provided at two places of the guide hole 14A and the screwing hole 41 of the nut 40. The tightening of the bolt 50 may be completed while being screwed.
(2) Although the lower surface of the fixed washer 53 is used as the pressing surface in the above embodiment, according to the present invention, the lower surface of the stepped portion may be used as the pressing surface by using a so-called stepped bolt. That is, a stepped bolt may be configured by setting the side screwed into the screwing hole 41 of the nut 40 to a small diameter and setting the side screwed to the guide hole 14A of the bolt guiding part 14 to a large diameter. In this case, the fixed washer 53 may not be used.

(3) In the above embodiment, the terminal accommodating portion 12 penetrates in the inner and outer directions of the device side case 20, but according to the present invention, a terminal accommodating portion that opens only on the inner side of the device side case 20 is formed. Also good.
(4) Although the head 50 of the bolt 50 does not come into contact with the bolt guiding portion 14 when the tightening of the bolt 50 is completed in the above embodiment, the head 51 of the bolt 50 is bolt guided according to the present invention. The tightening of the bolt 50 may be completed in a state in which the bolt 14 is slightly in contact.

(5) Although the cushion material 60 is illustrated as an elastic member in the above embodiment, according to the present invention, instead of providing the cushion material 60, the nut 40 is disposed with a clearance with respect to the nut housing portion 16. May be. If it does in this way, since nut 40 will be able to move loosely by the amount of clearance, the fastening position of nut 40 can be adjusted with bolt 50 tightening.
(6) Although the nut retainer 70 is prevented from being detached by the device side terminal 21 in the above embodiment, according to the present invention, the nut retainer 70 may be retained by the device side case 20 or the wire side terminal 32.
(7) Although the bolt guiding portion 14 and the terminal block 15 are integrally formed in the above embodiment, according to the present invention, the bolt guiding portion 14 and the terminal block 15 are individually formed, and each is mounted on the device side case 20. It may be fixed.

DESCRIPTION OF SYMBOLS 11 ... Equipment side housing 14 ... Bolt guide part 14A ... Guide hole 15 ... Terminal block 16 ... Nut accommodating part 20 ... Equipment side case 21 ... Equipment side terminal 32 ... Electric wire side terminal 40 ... Nut 50 ... Bolt 51 ... Head 52 ... Large diameter part 53 ... Fixed washer 54 ... Small diameter part 60 ... Cushion material (elastic member)
70 ... Nut retainer

Claims (7)

A terminal group having a terminal connected to the device side and a terminal connected to the electric wire side;
A terminal block that is fixed to the device side case and overlaid with the terminal group;
A nut assembled in a state of being prevented from rotating on the terminal block;
A bolt screwed into the nut;
A holding surface that is provided on the bolt and fastens the terminal group to the terminal block by pressing the terminal group against the nut as the bolt is tightened;
A terminal connection structure provided with a guide hole that can be screwed to the bolt at a position closer to the bolt than the nut, and that guides the bolt to the nut by tightening the bolt. .   The bolt includes a large-diameter portion that is screwed into the guide hole, and a small-diameter portion that is smaller in diameter than the large-diameter portion and is not screwed into the guide hole. The large-diameter portion is the guide The terminal connection structure according to claim 1, wherein tightening of the bolt is completed in a state where the small diameter portion is inserted into the guide hole through the hole.   A fixed washer is attached and fixed between the guide hole and the terminal block in the bolt screwed into the guide hole, and a surface of the fixed washer facing the nut is the pressing surface. The terminal connection structure according to claim 1 or 2.   A device-side housing for fixing the terminal block to the device-side case is provided, and the device-side housing is configured to open between the guide hole and the terminal block in a direction crossing the tightening direction of the bolt. The terminal connection structure according to claim 3.   A bolt guide portion that constitutes the guide hole; the bolt guide portion is disposed between the nut and the head portion of the bolt; and when the bolt is completely tightened, the bolt head portion The terminal connection structure according to any one of claims 1 to 4, wherein the portion is not in contact with the bolt guiding portion.   The terminal connection structure according to any one of claims 1 to 5, wherein an elastic member that supports the nut so as to be freely movable is attached to a nut housing portion that houses the nut in the terminal block.   The terminal block is provided with a nut retainer for retaining the nut assembled to the terminal block, and one terminal of the terminal group is fastened to the terminal block while retaining the nut retainer. The terminal connection structure according to claim 1, wherein the terminal connection structure is provided.

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