JP5810067B2 - Fastening member guide structure - Google Patents

Description

  In the unfastened portion before the fastening member is fastened to the fastening portion of the fastening target member to be fastened by the fastening member by screwing, the fastening member in the unfastened state disposed at the unfastened portion is provided. The present invention relates to a fastening member guide structure including guide means for guiding the fastening member so that the fastening member and the fastening portion are screwed together in a state where a screw shaft and a screw shaft of the fastening portion are aligned.

  For example, the fastening member guide structure described above is often provided in a housing such as a relay box or a fusible link. As an example of the configuration, a “fusible link unit” disclosed in Patent Document 1 has been proposed.

  Such a fusible link includes a fusible link unit disclosed in Patent Document 1, and constitutes a connecting portion for connection with a crimp terminal crimped to the tip of a power supply electric wire.

  In the connecting portion, the stud bolt is erected from the housing side, and the crimp terminal is connected by screwing the nut to the stud bolt and fastening it with the crimp terminal crimped to the tip of the electric wire interposed.

  Tighten the nut by inserting the nut into the nut holding head provided at the tip of the fastening tool and setting the nut holding head in an unfastened position in that state. By rotating around, the nut is fastened at the fastening point by screwing the nut onto the stud bolt with the crimp terminal interposed.

  Here, if the nut is about to be screwed with respect to the stud bolt, that is, if the screw shaft of the nut and the screw shaft of the stud bolt do not coincide with each other, the nut cannot be fastened smoothly. There is a problem that a sufficient fastening force cannot be exhibited and a stable electrical connection state with the crimp terminal at the connection portion cannot be obtained.

  For this reason, according to the configuration of the “fusible link unit” disclosed in Patent Document 1, the connection portion is a hollow cylindrical shape capable of guiding a fastening tool arranged at an unfastened location on the outer periphery of a standing stud bolt. The guide member is arranged.

  However, as described above, when the guide member arranged at the connection portion is firmly guided by abutting the fastening tool holding the nut from the outer peripheral side of the unfastened portion, the guide member is rotated when the fastening tool is rotated. There arises a problem that there is a risk of hindering the smooth screwing operation of the fastening tool.

  On the other hand, in order to ensure smooth rotation of the fastening tool, when a gap (play) is provided between the fastening tool placed at the unfastened location and the guide member, it is placed at the unfastened location by the guide member. Since the fastening tool cannot be firmly guided and a sufficient guide function cannot be achieved, there has been a problem that the inclination of the nut with respect to the stud bolt cannot be prevented.

JP 2010-40254 A

  An object of the present invention is to provide a fastening member guide structure that can smoothly and firmly fasten the fastening member to the fastening portion without the fastening member being inclined with respect to the fastening portion.

The present invention relates to an unfastened state of the fastening member that is disposed at the unfastened portion at an unfastened portion before the fastening member is fastened by screwing to a fastening portion of the fastening target member that is a fastening target of the fastening member. A fastening member guide structure comprising guide means for guiding the fastening member so that the fastening member and the fastening part are fastened in a state where the screw shaft and the screw shaft of the fastening part coincide with each other. , said with projecting from the outer peripheral side of the unfastened position to allow guiding the fastening member in the radially inward direction, the retractably formed from a non-fastening position radially outward direction with the fastening of the fastening member, the guide Means for guiding the fastening member disposed at the unfastened location from below, and upper placement guide for guiding the fastening tool for fastening the fastening member disposed at the unfastened location from above. And Characterized in that it was.

  By the above-described guide means, it is possible to guide the fastening member in an unfastened state arranged at an unfastened location so that the screw shaft of the fastening member and the screw shaft of the fastening portion are in a coincident state. The fastening member can be firmly and smoothly fastened without being inclined with respect to the fastening portion.

  Specifically, according to the configuration described above, the guide means protrudes in the radially inward direction from the outer peripheral side of the unfastened location, so that when the fastening member is disposed at the unfastened location, the fastening member Abuts on the guide means. Accordingly, the screw shaft of the fastening member and the screw shaft of the fastening portion are guided to coincide with each other.

  Therefore, the fastening member can be fastened firmly and smoothly without being inclined with respect to the fastening portion.

  Further, the fastening member is fastened to the fastening portion from the unfastened location to the fastened location by forming the guide means so that it can be retracted from the unfastened location in the radially outward direction when the fastening member is fastened. When doing so, the guide means can be smoothly fastened without obstruction.

Further, the guide means is guided from the upper side by a lower placement guide means for guiding the fastening member arranged at the unfastened location from below and a fastening tool for fastening the fastening member arranged at the unfastened location. By constituting with the upper arrangement guide means, the lower arrangement guide means and the upper arrangement guide means can guide the fastening tool so as to be sandwiched from the upper and lower sides. Since it can be guided in a stable state without being fixed in the axial direction, it can be guided accurately and firmly.

  Here, the fastening member may be either a nut or a bolt, and when the fastening member is formed of a nut, the fastening portion can be formed of a bolt formed with a male screw. . Or when the said fastening member is formed with a volt | bolt, a fastening part can be formed with the nut in which the female screw part was formed, for example. In this way, the fastening member and the fastening portion may have any configuration as long as they can be screwed together.

  In addition, the guide means does not need to protrude and be guided from the fastening target member like a wall provided on the outer peripheral side of the unfastened portion, and thus can be reduced in height.

As described above, the guide means is formed so as to be retractable, for example, includes that formed so as to be elastically deformable.
Further, the guide means is not limited to being configured integrally with the fastening member, but may be configured as a separate body that is detachable from the fastening member.

  As an aspect of the present invention, a guide wall portion for guiding a fastening tool for fastening the fastening member to the unfastened location can be formed on the outer peripheral side of the unfastened location.

  As described above, by forming the guide wall portion on the outer peripheral side of the unfastened portion, the fastening member arranged at the unfastened portion and the fastening tool for fastening the fastening member are guided from the outer peripheral side. Can do.

  Specifically, since the guide wall portion can be arranged in a wide range on the outer peripheral side of the unfastened location, the fastening tool arranged in the unfastened location can be guided in a wide range from the outer peripheral side. it can.

  On the other hand, since the said guide means protrudes and forms the said fastening member so that guidance is possible, since it becomes difficult to produce the clearance gap equivalent to a play with a fastening tool, it can guide firmly.

  In this way, by configuring the guide wall portion in addition to the guide means, it is possible to guide firmly utilizing the features of both the guide means and the guide wall portion.

  Further, as an aspect of the present invention, the fastening portion protrudes from the bottom portion of the fastening portion to which the fastening member and the fastening portion are fastened toward the unfastened portion, and a protruding male member having a screw portion formed on the outer periphery. It can be constituted by a screw part, and the guide means can be arranged at a position corresponding to the formed end part on the tip side in the axial direction of the screw part.

  When the screwed portion of the fastening member and the screwed portion of the fastening portion are engaged with each other, the screw shaft of the fastening member and the screw shaft of the fastening portion are aligned with each other. Therefore, the inclination of the fastening member with respect to the fastening portion can be accurately and reliably corrected.

  Therefore, the fastening member can be fastened to the fastening portion more firmly and smoothly.

  Here, the protruding male screw portion includes, for example, a protruding portion of a stud bolt erected at a predetermined position of the fastening target member.

  Moreover, as an aspect of the present invention, a guide surface for guiding the fastening member in the guiding means is directed from the radially outward direction to the radially inward direction and close to the fastening portion side where the fastening member and the fastening portion are fastened. It can be formed with an inclined surface.

  As described above, by forming the guide surface with the inclined surface, the fastening member is arranged so that the screw shaft of the fastening member coincides with the screw shaft of the fastening portion. It can be actively guided using gravity.

  In addition, not only the inclination of the fastening member with respect to the fastening portion, but also the radial position of the fastening member can be corrected.

Therefore, the fastening member can be fastened to the fastening portion more firmly and smoothly.
The inclined surface may be, for example, tapered, multistage, or curved.

  Further, as an aspect of the present invention, the three guiding means are provided, and each of them can be arranged substantially equally in the circumferential direction.

  According to the above-described configuration, since the three guiding means are provided, and the fastening members can be guided in a balanced manner by the respective guiding means by arranging them substantially equally in the circumferential direction, the fastening members Can be guided without being inclined with respect to the fastening portion.

  In addition, since the three guide means are provided and each of them is arranged approximately equally in the circumferential direction, the guide can be efficiently guided by the minimum guide means. The configuration is not complicated as in the case of the arrangement, and the manufacturing cost can be reduced.

As an aspect of the present invention, a holding portion that holds the fastening member disposed at a fastening portion where the fastening member and the fastening portion are fastened can be configured in the guide means.

As an aspect of the present invention, a pressing surface for pressing a fastening member disposed at a fastening location where the fastening member and the fastening portion are fastened can be formed on the guide means.

  With the configuration described above, loosening of the fastening member can be prevented. In addition, since the fastening state of the fastening member can be confirmed based on the shape of the guide means that is deformed by the reaction force received by the fastening member from the fastening member, it can be accurately and easily determined whether the fastening member is firmly fastened. can do.

  Moreover, as an aspect of the present invention, the fastening object member can be set in a housing of an electrical junction box.

  According to the above-described configuration, for example, a crimp terminal that is crimped to the tip of the power supply electric wire is firmly connected to the electric terminal such as a fusible link without causing poor contact due to the fastening between the fastening member and the fastening part. Can be attached to equipment.

  The fastening target member is not limited to the fusible link described above, and may be a fastening target member such as an electrical connection box such as a relay box or a fuse box or a housing such as an electronic device. There is no particular limitation.

  An object of the present invention is to provide a fastening member guide structure capable of fastening the fastening member smoothly and firmly to the fastening portion without tilting the fastening member with respect to the fastening portion.

The perspective view of a relay box. The perspective view of an external terminal connection unit. The top view of an external terminal connection unit. The longitudinal cross-sectional view of an external terminal connection unit in case a nut exists in an unfastened location. Action | operation explanatory drawing of an external terminal connection unit. The longitudinal cross-sectional view of an external terminal connection unit in case a nut exists in a fastening location. The longitudinal cross-sectional view of the external terminal connection unit in 2nd Embodiment. Action | operation explanatory drawing of the external terminal connection unit in 2nd Embodiment. The longitudinal cross-sectional view of the external terminal connection unit in 2nd Embodiment. The longitudinal cross-sectional view of the external terminal connection unit in 3rd Embodiment. The top view of the external terminal connection unit in 3rd Embodiment. The longitudinal cross-sectional view of the external terminal connection unit in 4th Embodiment. The top view of the external terminal connection unit in 4th Embodiment. Explanatory drawing of the external terminal connection unit in other embodiment. Explanatory drawing of the guide wall part in other embodiment.

An embodiment of the present invention will be described below with reference to the drawings.
(First embodiment)
FIG. 1 is a perspective view of the relay box 1, and more specifically, a perspective view of the base block 2 in the relay box 1 as viewed obliquely from the upper right. FIG. 2 is a perspective view of the external terminal connection unit 10 and its peripheral portion as viewed from the upper left. FIG. 3 is a plan view of the external terminal connection unit 10 of the first embodiment.

4 is a longitudinal sectional view of the external terminal connection unit 10 in the case where the nut 80 is in the unfastened location T, and the operation thereof, FIG. 5 is an operation explanatory view of the external terminal connection unit 10, and FIG. It is a longitudinal cross-sectional view of the external terminal connection unit 10 when there exists in the fastening location S. FIG.
4 to 6 are cross-sectional views taken along the line AOB in FIG. 3, but the terminal fitting 60 and the wire tip 51 are shown as viewed from the front side.

The relay box 1 in the present embodiment includes a base block 2 and an upper cover (not shown) that covers the base block 2 from above. The base block 2 includes two resin members, a base block main body 3 and a nut holder 4. Are integrally formed as shown in FIG.
The base block body 3 constitutes a connector housing for connecting a connector, fuse, and relay of an external harness. The nut holder 4 includes, for example, an external connection terminal connection unit 10 serving as a connection location of a terminal fitting 60 as an external terminal connected to an external device such as a fusible link or an alternator.

  The external connection terminal connection unit 10 described above is disposed at a predetermined location of the relay box 1 as shown in FIG. 1 in a state where the base block body 3 and the nut holder 4 are fitted.

  As shown in FIG. 4, the external connection terminal connection unit 10 has a stud bolt 12 erected from the base 11 of the external connection terminal connection unit 10. A male screw portion 14 is formed on the outer periphery of the stud bolt 12 from the base portion to the distal end side.

  The terminal fitting 60 described above includes a connecting portion 61 whose tip is formed in an annular shape so that it can be inserted into the stud bolt 12, and the connecting portion 61 inserted into the stud bolt 12 is a nut 80 screwed into the stud bolt 12. Accordingly, as shown in FIG. 6, the nut 80 is fastened in a state of being interposed between the base portion 11 and the nut 80.

  In addition, the connection part 61 of the terminal metal fitting 60, the washer 85, and the nut 80 are arranged in this order so that the washer 85 is interposed between the connection part 61 of the terminal metal fitting 60 and the nut 80. Is inserted through.

  The connecting portion 61 of the terminal fitting 60 is not limited to an annular shape, and can be connected to the stud bolt 12 such as a pair of protruding pieces protruding at an interval corresponding to the outer diameter of the stud bolt 12. If there is no particular limitation.

  Here, in the axial direction of the stud bolt 12, the place fastened by the nut 80 while being inserted into the stud bolt 12 until the annular connecting portion 61 comes into contact with the base portion 11 is set as the fastening place S (see FIG. 6). . Further, the portion corresponding to the formation end portion 13a of the male screw portion 14 on the distal end side of the stud bolt 12, in other words, the state immediately before the female screw portion 81 of the nut 80 is screwed into the male screw portion 14 of the stud bolt 12. The place where the nut 80 is arranged is set to an unfastened place T (see FIG. 4).

  Furthermore, in the following description, the protruding direction of the stud bolt 12 in the axial direction of the stud bolt 12 is set to the upward direction Du, and the direction opposite to the protruding direction is set to the downward direction Dd.

  As shown in FIGS. 2 and 3, the terminal fitting 60 forms the above-described annular connecting portion 61 on the tip side, and crimps and connects the wire tip 51 on the tip side of the wire 50 to the base side. A barrel portion 62 is formed. The barrel portion 62 includes a wire barrel portion 63 that crimps the conductor tip portion 52 that peels off the insulation coating 53A from the wire tip portion 51 and exposes the conductor 52A, and a proximal end side of the conductor tip portion 52 in the wire tip portion 51. It is comprised with the insulation barrel part 64 which crimps | bonds the coating | coated front-end | tip part 53 coat | covered with the insulation coating 53A.

  In addition, a resin guide wall portion 41 that guides the fastening tool 70 that assists the fastening of the nut 80 to the unfastened location T is formed on the outer peripheral side of the fastened location S and the unfastened location T. In addition, the front-end | tip part of the fastening tool 70 is provided with the head part 71 (holding part) which hold | maintains (chucks) the nut 80. FIG.

  The guide wall 41 is formed so as to protrude from the outer peripheral side of the base portion 11 in the same direction (Du) as the protruding direction of the stud bolt 12 at least from the protruding height of the stud bolt 12.

  Specifically, the guide wall portion 41 is disposed at the unfastened location T so that the entire outer periphery of the head portion 71 can be firmly guided from the outside in a state where the head portion 71 of the fastening tool 70 is disposed at the unfastened location T. For example, the head portion 71 is formed with a height of 45 mm so as to be higher than the base end portion (upper end portion).

  As shown in FIG. 3, the guide wall portion 41 is formed in a C-shape in a plan view having a terminal arrangement allowable slit 41 </ b> A in which a part of the cylindrical circumferential direction is cut out in a part of the circumferential direction. The terminal arrangement allowable slit 41 </ b> A is formed so that the terminal fitting 60 in a state in which the connection portion 61 is inserted into the stud bolt 12 has a width that allows communication between the radially inner side and the radially outer side with respect to the guide wall portion 41. ing.

  In addition, as shown in FIG. 2, the guide wall portion 41 is provided with slits 41 </ b> B that are long in the vertical direction at appropriate intervals, and a portion between the slits 41 </ b> B is formed in a beam shape. It is formed to be able to bend and deform in the radial direction.

  Further, the guide wall portion 41 is formed with an inner diameter that is slightly larger than the outer diameter of the head portion 71 of the fastening tool 70 so that the head portion 71 of the fastening tool 70 holding the nut 80 can be guided from the outside. Specifically, as shown in FIGS. 3 and 4, the guide wall portion 41 has a clearance ΔL (which can be rotated in a state where the head portion 71 of the fastening tool 70 is inserted into the guide wall portion 41. Play) is formed with an inner diameter secured between the head portion 71 and the head.

Further, a guide protrusion 20 is formed on the inner peripheral surface of the guide wall portion 41 so as to project radially inward so that the nut 80 can be fastened to the stud bolt 12 at an unfastened location T.
Specifically, the guide protrusion 20 is a protrusion that guides the nut 80 and the stud bolt 12 to be fastened at the unfastened location T, and the screw of the unfastened nut 80 disposed at the unfastened location T. The inner periphery of the guide wall portion 41 can be guided in a state where the head portion 71 of the fastening tool 70 is supported from below so that the nut 80 is held in a state where the shaft 80a and the screw shaft 13 of the stud bolt 12 coincide with each other. It is formed in a protruding shape having a substantially triangular shape when viewed from the vertical section (see FIG. 4).

The guide protrusion 20 is formed with the upper surface of the guide protrusion 20 as a guide surface 21 for guiding the nut 80. As shown in FIG. 4, the guide surface 21 is directed from the radially outward direction to the radially inward direction, in other words, in the direction approaching the fastening portion S side from the base side to the distal end side in the protruding direction (downward direction Dd ). That is, the guide surface 21 is formed as an inclined surface that gradually descends from the base side in the protruding direction to the tip.
Note that the guide surface 21 is not limited to a linear inclined surface when the guide protrusion 20 is viewed in a longitudinal section, and may be formed as a curved inclined surface.

  The guide projecting piece 20 has an arrangement height on the inner peripheral surface of the guide wall portion 41 that can be guided in a state where the fastening tool 70 arranged at the unfastened location T is supported from below, that is, the inner periphery of the guide wall portion 41. The surface is arranged at a height corresponding to the formation end portion 13a of the male screw portion 14 on the tip end side in the axial direction of the stud bolt 12.

  As shown in FIG. 3, the guide protrusions 20 are provided in the circumferential direction at the above-described arrangement height on the inner peripheral surface of the guide wall portion 41. These three guide protrusions 20 are arranged on the inner peripheral surface of the guide wall portion 41 at approximately 120 ° intervals and at the same height so that the circumferential direction of the guide wall portion 41 is equally divided into three. ing.

  Specifically, as shown in FIG. 3, two of the three guide protrusions 20 are set as the first guide protrusion 20A and the second guide protrusion 20B, respectively. 20A and the 2nd guide protrusion 20B are each arrange | positioned at the both ends of the terminal arrangement | positioning permissible slit 41A of the circumferential direction of the guide wall part 41. As shown in FIG. The remaining one of the three guide protrusions 20 is set as the third guide protrusion 20C, and the third guide protrusion 20C is formed in the terminal arrangement allowable slit 41A on the inner peripheral surface of the guide wall portion 41. On the other hand, it arrange | positions in the part which opposes across the center part of the inner side space of the guide wall part 41. FIG.

  Further, the guide protrusion 20 and the peripheral portion of the guide protrusion 20 in the guide wall portion 41 are out of diameter by the head portion 71 of the fastening tool 70 being lowered from the unfastened portion T as the nut 80 is fastened. It is integrally formed with the guide wall portion 41 by resin molding so as to be elastically deformed so as to be recessed so as to be retractable in the direction.

Next, a procedure for connecting the terminal fitting 60 to the external terminal connection unit 10 described above will be described with reference to FIGS. 2 and 4 to 6.
First, the connection part 61 of the terminal fitting 60 is inserted into the stud bolt 12 erected from the base part 11 of the external terminal connection unit 10. Further, the nut 80 is inserted into the inner space of the guide wall portion 41 in a state where the nut 80 is fitted and held in the head portion 71 of the fastening tool 70.

  Then, as shown in FIGS. 2 and 4, in a state where the head portion 71 of the fastening tool 70 is disposed at the unfastened location T, the state is supported by the guide protrusion 20.

  Due to the gravity of the fastening tool 70 and the nut 80 or the pressing force of the fastening tool 70 downward on the head portion 71, the fastening tool 70 has three guide protrusions 20 (20 </ b> A, 20 </ b> B, 20 </ b> C) at the unfastened location T. Each guide surface 21 is guided.

  Thus, like the nut 80 indicated by the phantom line in FIG. 4, the screw shaft 80 a of the nut 80 is temporarily inclined with respect to the screw shaft 12 a of the stud bolt 12 at the unfastened portion T. Even in this case, as shown in FIG. 4, the nut 80 is guided so that the screw shaft 80 a of the nut 80 and the screw shaft 12 a of the stud bolt 12 are aligned with each other. Can be corrected.

  Therefore, the female screw portion 81 (see FIG. 5) of the nut 80 and the male screw portion 14 of the stud bolt 12 are engaged with each other without being turned, and the nut 80 is smoothly and appropriately engaged with the stud bolt 12. Can do.

After the nut 80 is once screwed into the stud bolt 12, the nut 80 can be screwed into the stud bolt 12 by, for example, swinging the fastening tool 70 as a fastening operation by the fastening tool 70. it can.
At that time, the lower end portion of the head portion 71 of the fastening tool 70 is in contact with the guide surface 21 of the guide protrusion 20, but as the nut 80 is screwed relative to the stud bolt 12, Since the guide protrusion 20 is pressed by the lower end portion, as shown in FIG. 5, the guide protrusion 20 formed so as to be elastically deformable by a resin material is compressed and deformed in the radially outward direction.

  As a result, as shown in FIG. 6, the guide protrusion 20 does not prevent the nut 80 from being screwed downward in the axial direction of the stud bolt 12, and the nut 80 has the terminal fitting 60 at the fastening point S. The connection part 61 can be fastened smoothly and firmly.

In addition, after fastening the connection part 61 of the terminal metal fitting 60 in the fastening location S, the nut 80 can be released with respect to the holding by the fastening tool 70 by lifting the fastening tool 70.
At that time, since the compression by the fastening tool 70 is released, the guide projection piece 20 is restored from the compressed shape to the original projection shape by the elasticity of the guide projection piece 20 (see FIG. 6).

The external terminal connection unit 10 described above can achieve the following operational effects.
As described above, the guide projecting piece 20 is formed so as to project the nut 80 in the radially inward direction from the outer peripheral side of the unfastened portion T of the guide wall portion 41, and as shown in FIG. It is possible to guide the nut 80 in the unfastened state arranged in the nut 80 so that the screw shaft 80a of the nut 80 and the screw shaft 12a of the stud bolt 12 are aligned. Accordingly, the nut 80 can be firmly and smoothly fastened without being inclined with respect to the stud bolt 12.

  Furthermore, as shown in FIG. 5, the nut 80 is moved from the unfastened location T to the fastened location S by forming the guide protrusion 20 so as to be retracted from the unfastened location T in the radially outward direction when the nut 80 is fastened. When fastening to the stud bolt 12, the nut 80 can be smoothly fastened without being in the way.

  Moreover, since the guide wall part 41 which guides the fastening tool 70 which fastens the nut 80 to the unfastened location T is formed on the outer peripheral side of the unfastened location T, the nut 80 and the nut 80 arranged at the unfastened location T are fastened. The head part 71 of the fastening tool 70 can be guided from the outer peripheral side.

  Specifically, since the guide wall portion 41 can be disposed in a wide range on the outer peripheral side of the unfastened location T, the head portion 71 of the fastening tool 70 disposed in the unfastened location T is firmly attached from the outer peripheral side. Can guide. Moreover, the guide wall portion 41 can smoothly guide the head portion 71 to a position where it can be guided by the guide protrusion 20.

  On the other hand, since the guide protrusion 20 is formed so as to project the nut 80 so that it can be guided, the guide protrusion 20 can be firmly guided without a gap ΔL corresponding to play with the fastening tool 70.

  In this way, by configuring the guide wall portion 41 in addition to the guide projection piece 20, it is possible to guide firmly by making use of the features of both the guide projection piece 20 and the guide wall portion 41.

  The stud bolt 12 protrudes from the base portion 11 of the fastening portion S where the stud bolt 12 and the nut 80 are fastened toward the non-fastened portion T, and a male screw portion 14 is formed on the outer periphery. The male screw portion 14 is disposed at a position corresponding to the forming end portion 13a on the distal end side in the axial direction.

  Thus, when the female screw portion 81 of the nut 80 and the male screw portion 14 of the stud bolt 12 are engaged with each other, the nut 80 is connected to the screw shaft 80a of the nut 80 and the screw shaft 12a of the stud bolt 12. Since it can guide so that it may correspond, it can correct the inclination of nut 80 to stud bolt 12 accurately and surely.

  Accordingly, the nut 80 can be fastened to the stud bolt 12 more firmly and smoothly.

  Further, the guide surface 21 for guiding the nut 80 in the guide protrusion 20 is formed by an inclined surface close to the fastening portion S side where the nut 80 and the stud bolt 12 are fastened from the radially outward direction to the radially inward direction. By doing so, the nut 80 can be actively guided using the gravity of the nut 80 so that the screw shaft 80a of the nut 80 and the screw shaft 12a of the stud bolt 12 are aligned. .

  In addition, not only the inclination of the nut 80 with respect to the stud bolt 12 but also the radial position of the nut 80 inside the guide wall portion 41 can be corrected.

  Accordingly, the nut 80 can be fastened to the stud bolt 12 more firmly and smoothly.

  In addition, three guide protrusions 20 having the same height and the same shape are provided, and each guide protrusion 20 is arranged approximately equally in the circumferential direction, so that each guide protrusion 20 (20A, 20B, 20C) Since the nut 80 can be guided in a well-balanced manner, the nut 80 can be stably guided without being inclined with respect to the stud bolt 12.

  In addition, since the guide can be efficiently guided by the minimum number of guide protrusions 20, the configuration is not complicated as in the case where four or more guide protrusions 20 are disposed, and the manufacturing cost is reduced. Can be reduced.

Hereinafter, the external terminal connection units 10P1, 10P2, and 10P3 in other embodiments will be described.
However, among the configurations of the external terminal connection units 10P1, 10P2, and 10P3 described below, the same configurations as those of the external terminal connection unit 10 in the first embodiment described above are denoted by the same reference numerals, and the description thereof is omitted. Omitted.

(Second Embodiment)
FIG. 7 is a longitudinal sectional view of the external terminal connection unit 10P1 according to the second embodiment when the nut 80 is located at the unfastened portion T, and an operation description thereof, and corresponds to FIG. FIG. 8 is an explanatory diagram of the operation of the external terminal connection unit 10P1, and corresponds to FIG. FIG. 9 is a longitudinal sectional view of the external terminal connection unit 10P1 in the case where the nut 80 is at the fastening point S, and corresponds to FIG.

  The guide protrusion 20P1 of the second embodiment is formed in an elongated shape, and as shown in FIG. 7, a bent portion 25 bent at a substantially middle portion in the longitudinal direction, and on one side portion with respect to the bent portion 25 The upper piece portion 26 corresponds to the lower piece portion 27 corresponding to the other side portion.

  As shown in FIG. 7, the guide protrusion piece 20 </ b> P <b> 1 of the second embodiment has an end portion in the longitudinal direction of the guide protrusion piece 20 </ b> P <b> 1 at the portion between the unfastened place T and the fastened place S of the guide wall portion 41. In addition to being connected at a height corresponding to the fastening location T, the other end in the longitudinal direction of the guide protrusion 20P1 is connected to a height corresponding to the fastening location S. Thereby, the guide protrusion 20P1 of the second embodiment is arranged in a shape protruding in the radial direction with the bent portion 25 bent.

  The guide protrusion 20P1 of the second embodiment includes a guide surface 21 that guides the upper surface of the upper piece 26 of the guide protrusion 20P1 while supporting the fastening tool 70 at the unfastened location T. On the lower surface of the lower piece portion 27 of the piece 20P1, a holding surface 27a for holding the nut 80 of the fastening portion S is configured.

  Specifically, as shown in FIG. 7, the guide surface 21 of the guide protrusion 20 </ b> P <b> 1 is configured to be capable of guiding in a state where the nut 80 arranged at the unfastened location T is indirectly supported via the fastening tool 70. Yes. Furthermore, as shown in FIG. 9, the pressing surface 27a of the guide protrusion 20P1 is configured so that the upper portion of the nut 80 disposed at the fastening location S can be locked by pressing.

The external terminal connection unit 10P1 described above can achieve the following operational effects.
The guide surface 21 of the guide protrusion 20P1 can guide the nut 80 disposed at the unfastened location T in a state where the nut 80 is supported from below via the fastening tool 70.

On the other hand, as shown in FIG. 9, the pressing surface 27a of the guide protrusion 20P1 abuts on the nut 80 in the fastening state arranged at the fastening point S, so that the fastening of the nut 80 is loosened and floats. Even if it tries to rise, the guide protrusion 20P1 is elastically deformed, and the upper portion of the nut 80 disposed at the fastening point S can be pressed and held by the pressing surface 27a by utilizing the elastic force.
Thereby, the firm fastening state of the nut 80 can be ensured.

  As described above, two types of actions and effects of guiding the nut 80 disposed at the non-fastened location T and pressing and holding the nut 80 disposed at the fastened location S can be achieved by one type of guide protrusion 20P1.

  Further, as shown in FIGS. 8 and 9, when the nut 80 does not reach the fastening portion S, the guide protrusion 20P1 is bent and deformed. For this reason, it can be easily determined visually that the nut 80 has not reached the fastening point S based on the fact that the guide protrusion 20P1 is greatly bent and deformed. That is, the guide protrusion 20P1 can be used as a means for confirming the fastening condition of the nut 80.

  Further, when the guide protrusion 20P1 is bent, or when the guide wall portion 41 is bent radially outward in accordance with the bending of the guide protrusion 20P1, the base block body 3 of the present embodiment is compared. When the upper cover is to be fitted, the upper cover may interfere with the bent and deformed guide protrusion 20P1 or the bent and deformed guide wall portion 41, and the upper cover cannot be fitted.

  Accordingly, since the upper cover can be fitted only when the nut 80 is sufficiently fastened at the fastening point S, it is possible to realize a firm fastening without being conscious of it, so that the reliability of electrical connection is improved. Can be easily achieved.

(Third embodiment)
The external terminal connection unit 10P2 of the third embodiment is fastened at the unfastened location T in addition to the above-described guide protrusion 20 that guides the fastening tool 70 placed at the unfastened location T from the lower side. The guide protrusion 20 is configured to contact the upper end portion of the head portion 71 of the tool 70 and lock the fastening tool 70.

Specifically, the guide protrusion 20 sets the guide protrusion 20 of the first embodiment to the lower guide protrusion 20d, and guides the fastening tool 70 for fastening the fastening tool 70 disposed at the unfastened location T from above. The upper guide protrusion 20u is set.
The upper guide protrusion 20 u has a lower surface that abuts on the upper portion of the head portion 71 of the fastening tool 70 as a guide surface 21.

  Two upper guide protrusions 20u are provided, each of which includes a first upper guide protrusion 20uA and a second upper guide protrusion 20uB. Each of the first upper guide protrusion 20uA and the second upper guide protrusion 20uB is disposed at the same height at a position corresponding to the upper portion of the fastening tool 70 disposed at the unfastened position T in the guide wall portion 41. Yes.

  Further, as shown in FIG. 11, the first upper guide protrusion 20uA and the second upper guide protrusion 20uB include a first lower guide protrusion 20dA and a second lower guide protrusion 20dB arranged on the lower side. The third lower guide projection piece 20dC is arranged on the inner wall side of the guide wall portion 41 at a shifted position without matching (without overlapping) in the circumferential direction.

  Specifically, the first upper guide protrusion 20uA and the second upper guide protrusion 20uB are virtual lines L1 that connect the intermediate portion in the width direction of the terminal arrangement allowable slit 41A and the second lower guide protrusion 20dB. On the orthogonal line L2 orthogonal to the virtual line L1 passing through the standing position of the stud bolt 12, the guide wall portion 41 faces the stud bolt 12 at a standing position (center portion of the guide wall portion 41). Arranged on each side.

The external terminal connection unit 10P2 described above can achieve the following operational effects.
The lower guide protrusion 20d for guiding the guide protrusion 20 from the lower side to the nut 80 disposed at the unfastened location T, and the upper side for guiding the fastening tool 70 holding the nut 80 disposed at the unfastened location T from above. By constituting the guide projection piece 20u, the lower guide projection piece 20d and the upper guide projection piece 20u can guide the fastening tool 70 so as to be sandwiched from the upper and lower sides. Can be guided in a stable state without being fixed in the axial direction, and therefore can be guided accurately and firmly.

  As described above, the first upper guide protrusion 20uA and the second upper guide protrusion 20uB disposed on the upper side, the first lower guide protrusion 20dA, the second lower guide protrusion 20dB disposed on the lower side, And the third lower guide protrusion 20dC are not aligned with each other in the circumferential direction (without overlapping), but are arranged at a shifted position on the inner wall side of the guide wall portion 41, thereby lowering the upper guide protrusion 20u and the lower guide protrusion 20dC. The guide wall portion 41 including the side guide protrusion 20d can be easily configured by molding.

(Fourth embodiment)
FIG. 12 is a longitudinal sectional view and an operation explanation of the external terminal connection unit 10P3 of the fourth embodiment in the case where the nut 80 is in the unfastened portion T, and is a diagram corresponding to FIG. 4 in detail. FIG. 13 is a plan view of the external terminal connection unit 10P3 of the third embodiment.

  In the external terminal connection unit 10P3 of the fourth embodiment, the guide wall portion 41Z is formed with a low profile as compared with the guide wall portion 41 of the above-described embodiment, and the guide protrusions are formed on the inner wall surface of the guide wall portion 41. 20, three guide projecting wall portions 91 projecting radially inward from the inner wall surface are arranged in the circumferential direction. The guide protruding wall portion 91 is formed in a small protruding shape that protrudes along the vertical direction Dd of the inner wall surface of the guide wall portion 41, and includes a tapered guide portion 91a and a linear guide portion 91b.

  The tapered guide portion 91a is formed to have a tapered guide surface 21 in a portion corresponding to the upper portion of the unfastened portion T, and is approximately the same diameter as the outer diameter of the fastening tool 70 so that the fastening tool 70 can be inserted. Until it becomes, it gradually protrudes in the radially inward direction from the upper end to the lower side.

  The straight guide portion 91b has a screw shaft of the stud bolt 12 at a lower portion of the guide protrusion wall portion 91 than the taper guide portion 91a, that is, a portion corresponding to the unfastened portion T and a lower portion of the portion. It has a linear guide surface 21 parallel to 12a.

That is, the guide protrusion 91 is formed by a linear guide 91b at a portion corresponding to the unfastened portion T in the vertical direction Dd of the guide protrusion 91.
Further, the guide wall portion 41Z is not formed with the slit hole 41B in order to increase the rigidity and enhance the guide function than the above-described guide wall portion 41.

The external terminal connection unit 10P3 described above can achieve the following operational effects.
Since the upper part of the guide protruding wall portion 91 is formed by the taper guide portion 91a, the head portion 71 of the fastening tool 70 can be smoothly inserted into the guide wall portion 41Z, and the inserted head portion 71 is not fastened. The taper-shaped guide surface 21 can smoothly correct the inclination and position of the head portion 71 as it is inserted until the point T is reached.

  And as above-mentioned, since the guide protrusion wall part 91 forms the part equivalent to the unfastened location T in the up-down direction Dd of this guide protruded wall part 91 by the linear guide part 91b, the unfastened location T The head portion 71 of the fastening tool 70 arranged in the above can be guided by the linear guide portion 91b.

  In this case, the clearance (play) between the linear guide portion 91 b and the head portion 71 is set between the inner surface of the guide wall portion 41 </ b> Z that does not form the guide projection wall portion 91 and the head portion 71. It can be kept smaller than the clearance (play).

  Therefore, by guiding the head portion 71 of the fastening tool 70 arranged at the unfastened location T with the linear guide portion 91b, it is guided by the inner surface of the guide wall portion 41Z that does not form the guide protruding wall portion 91. However, the head portion 71 can be firmly guided.

  Further, by forming the guide protruding wall portion 91 in the guide wall portion 41Z, in particular, the tapered guide portion 91a, the fastening tool 70 can be smoothly guided to the unfastened portion T without securing the guide length of the guide wall portion 41Z. In addition, since the guide can be guided so as to correct the inclination and position of the head portion 71, the height of the guide wall portion 41Z is not required, and the guide wall portion 41Z can be formed with a low height.

  The guide wall portion 41Z is formed without the slit hole 41B because bending flexibility is not required, but the slit hole 41B may be formed to reduce the amount of material used.

  Further, as shown in FIG. 13, the guide protruding wall portion 91 includes three guide wall portions 41Z on the inner wall surface, and the three guide protruding wall portions 91 are equally distributed in the circumferential direction of the guide wall portion 41Z. The guide wall portion 41Z may be provided with a number other than three on the inner wall surface of the guide wall portion 41Z, and the guide protrusion wall portion 91 is a guide wall portion like a guide protrusion wall portion 91A shown in FIG. You may form in the whole circumferential direction of 41Z.

  FIG. 14 is a diagram illustrating the configuration of another embodiment. Specifically, FIG. 14 (a) is an explanatory view showing a guide protrusion 91A of another embodiment. FIG. 14B is an explanatory view showing a guide protrusion 20X of another embodiment described later.

In addition, the guide protrusion 20 is not limited to a triangular shape in a longitudinal section, and for example, has a trapezoidal shape in a longitudinal section with a distal end made flat like a guide protrusion 20X shown in FIG. It may be formed.
Thereby, the guide protrusion 20X can remove the tip portion which is unnecessary when guiding the head portion 71 of the fastening tool 70. For this reason, while the head part 71 of the fastening tool 70 arranged at the unfastened location T can be reliably guided, the pressure from the head part 71 is accompanied by the downward screwing of the nut 80 screwed to the stud bolt 12. Even if the guide projection piece 20X is received, the guide projection piece 20X can be easily retracted and the fastening tool 70 can be screwed downward without the guide projection piece 20X getting in the way.

  As described above, the guide protrusion 20 is not limited to the triangular shape in the longitudinal section view and the trapezoidal shape in the longitudinal section view, but may be formed in various shapes such as an arc shape in the longitudinal section view and a rectangular shape in the longitudinal section view.

  Further, like the external connection terminal connection unit 10 ′ in another embodiment shown in FIG. 15, the guide wall portion 41Z1 has the guide wall portion Z1 in a state where the head portion 71 of the fastening tool 70 is disposed at the unfastened location T. The upper end portion of the head portion 71 may be formed to be substantially the same height as the base end portion (upper end portion) of the head portion 71. Specifically, the guide wall portion 41Z1 is formed at a height of 35 mm, which is about 10 mm lower than the height of the guide wall portion 41 of the first embodiment formed at a height of 45 mm, and the external terminal connection of the fourth embodiment. The unit 10P3 is formed with a lower profile than the guide wall 41Z.

  According to such a configuration, the entire outer periphery of the head portion 71 in a state where it is arranged at the unfastened location T can be firmly guided from the outside, and the head portion 71 of the fastening tool 70 is placed inside the guide wall portion Z1. Therefore, the nut 80 held by the head portion 71 at the unfastened portion T can be easily screwed into the stud bolt 12.

  In addition, as described above, the guide wall portion of the present invention is formed at a height higher than the base end portion of the head portion 71 in a state where it is arranged at the unfastened location T, or You may form not only in the same height but in a low profile rather than the base end part of the head part 71 arrange | positioned in the unfastened location T. FIG.

In the correspondence between the configuration of the present invention and the embodiment,
The fastening member guide structure of the present invention corresponds to the external connection terminal connection units 10, 10P1, 10P2, 10P3, 10 ′,
Similarly,
The bottom part of the fastening part corresponds to the base part 11,
The projecting male screw portion having a screw portion formed on the fastening portion or the outer periphery corresponds to the stud bolt 12,
The forming end portion on the front tip side in the axial direction of the screw portion of the male screw portion corresponds to the forming end portion 13a of the male screw portion,
The screw part of the male screw part corresponds to the male screw part 14,
The guide means corresponds to the guide protrusion 20,
The fastening member corresponds to the nut 80,
The present invention is not limited to the configuration of the above-described embodiment, but can be applied based on the technical idea shown in the claims, and many embodiments can be obtained.

DESCRIPTION OF SYMBOLS 1 ... Relay box 10, 10P1, 10P2, 10P3, 10 '... External connection terminal connection unit 11 ... Base part 12 ... Stud bolt 13 ... Screw shaft 13a of a stud bolt ... End part 14 of a male screw part ... Male screw part 20 , 20P1, 20P2, 20X ... guide protrusion 21 ... guide surface 27a for guiding the nut ... pressing surface 41, 41Z, 41Z1 ... guide wall portion 61 ... connecting portion 70 ... fastening tool 80 ... nut 80a ... screw shaft 81 of the nut ... Female thread portion 91, 91A ... guide protrusion wall portion S ... fastened location T ... unfastened location

Claims (8)

In an unfastened location before the fastening member is fastened to the fastening portion of the fastening target member to be fastened by the fastening member by screwing, the screw shaft of the fastening member in the unfastened state disposed at the unfastened location and the A fastening member guide structure comprising guide means for guiding the fastening member so that the fastening member and the fastening portion are fastened in a state where the screw shaft of the fastening portion is coincident,
The guiding means;
The fastening member protrudes in a radially inward direction from the outer peripheral side of the unfastened location, and is formed so as to be retractable radially outward from the unfastened location with the fastening of the fastening member ,
A lower arrangement guide means for guiding the fastening member arranged at the unfastened location from the lower side;
A fastening member guide structure constituted by upper arrangement guide means for guiding a fastening tool for fastening the fastening member arranged at the unfastened portion from above . The fastening member guide structure according to claim 1, wherein a guide wall portion that guides a fastening tool for fastening the fastening member to the unfastened location is formed on an outer peripheral side of the unfastened location. The fastening portion,
The fastening member and the fastening part project from the bottom part of the fastening part to be fastened to the unfastened part, and are constituted by a protruding male screw part having a screw part formed on the outer periphery,
The guiding means;
The fastening member guide structure according to claim 1, wherein the fastening member guide structure is disposed at a position corresponding to a forming end portion on a distal end side in the axial direction of the screw portion. The guide surface that guides the fastening member in the guide means is formed by an inclined surface that is close to a fastening portion side where the fastening member and the fastening portion are fastened from the radially outward direction to the radially inward direction. The fastening member guide structure according to any one of 1 to 3. The fastening member guide structure according to any one of claims 1 to 4, wherein the guide member includes three guide means, and each of the guide means is arranged substantially equally in the circumferential direction. The fastening member guide structure according to any one of claims 1 to 5 , wherein the guide means includes a holding portion that holds the fastening member disposed at a fastening portion where the fastening member and the fastening portion are fastened . The fastening member guide structure according to any one of claims 1 to 6 , wherein the guide means includes a pressing surface that presses a fastening member disposed at a fastening portion where the fastening member and the fastening portion are fastened . The fastening member guide structure according to any one of claims 1 to 7 , wherein the fastening target member is set in a housing of an electrical junction box.

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