JP6587149B2 - connector - Google Patents

Description

  The present invention relates to a connector.

  In Patent Document 1, a housing, a plurality of terminal fittings inserted in the housing in parallel in the width direction, and the housing are assembled in a direction crossing the insertion / extraction direction of the terminal fitting, and the terminal fitting is prevented from being removed. A connector with a retainer is disclosed. The retainer has a main body portion that rises in the same direction as the assembly direction of the retainer from the substrate portion. At the rising end of the main body portion, a retaining portion that is locked to the terminal fitting is formed.

  As shown in FIG. 12, the retainer 100 has a pair of left and right side wall portions 102 that rise in the same direction as the assembly direction of the retainer 100 from both edges in the width direction of the substrate portion 101. A locking projection 103 is formed on the rising edge of the side wall 102 so as to protrude toward the inner surface. In the process of assembling the retainer 100 to the housing (not shown), the locking projection 103 interferes with the retaining portion of the housing, so that the side wall portion 102 is elastically displaced outward in the width direction. When the retainer 100 is in a properly assembled state, the locking projection 103 is locked to the housing, and the retainer 100 is held in the assembled state.

JP 2013-008572 A

  The side wall part 102 is a form which protruded in parallel with the insertion / extraction direction of a terminal metal fitting (illustration omitted) from the width direction both ends of the main-body part 104. FIG. The locking protrusion 103 has a shape extending in parallel with the insertion / extraction direction of the terminal fitting, and the base end portion 105 in the length direction of the locking protrusion 103 is connected to both widthwise ends of the main body portion 104. In such a structure, since the rigidity of the side wall portion 102 is high, when a load, an impact, or the like acts on the locking projection 103, the boundary portion of the locking projection 103 with the main body portion 104 (the base end of the locking projection 103). There is a concern that the portion 105) is damaged.

  The present invention has been completed based on the above circumstances, and an object thereof is to prevent breakage of the locking protrusion.

The connector of the present invention
A housing;
A plurality of terminal fittings inserted in parallel in the width direction in the housing;
A retainer that is assembled to the housing in a direction that intersects with the insertion direction of the terminal fitting, and prevents the terminal fitting from being removed,
Configuring the retainer, and a board portion having a plate surface in a direction intersecting with the assembly direction of the retainer;
Configuring the retainer, and a body portion in a form rising from the substrate portion in the same direction as the assembly direction of the retainer;
A retaining portion that is formed at the rising end of the main body and retains the terminal fitting by being locked to the terminal fitting,
The retainer is configured to rise from both edges in the width direction of the substrate portion in the same direction as the assembly direction of the retainer, and protrude substantially parallel to the insertion direction of the terminal fitting from both width direction ends of the main body portion. A pair of side walls,
A locking protrusion formed on the rising end of the side wall, and holding the retainer in an assembled state with respect to the housing by locking to the housing;
A groove-shaped recess formed at a boundary portion with the inner surface of the side wall portion of the width direction end portion of the main body portion, and substantially parallel to the assembly direction of the retainer;
A first notch formed at the widthwise end of the main body and communicating with the outer surface of the main body at the end opposite to the substrate in the recess;
It is characterized in that it comprises a second cutout portion that communicates with the first cutout portion and separates the locking projection from the main body portion.

  In the present invention, a concave portion is formed at a boundary portion with the inner side surface of the side wall portion of the width direction end portion of the main body portion, and the end portion on the opposite side of the substrate portion in the concave portion is connected to the outer surface of the main body portion by the first cutout portion. Further, since the locking projection is separated from the main body portion by the second notch portion communicating with the first notch portion, the outer wall portion constituting the recess can be elastically displaced integrally with the side wall portion. ing. According to the present invention, a region that can be elastically displaced integrally with the side wall portion is secured to reduce the rigidity of the side wall portion, and the locking projection is separated from the main body portion. It is possible to prevent the locking protrusion from being damaged when acted.

The perspective view of the retainer of Example 1. The perspective view showing the state which cut off the standup end part of a side wall part Partial enlarged view of FIG. Rear view of retainer XX sectional view of FIG. Partial enlarged view of FIG. Side view of retainer Side sectional view showing the retainer assembled to the housing at the temporary locking position Side sectional view showing the state where the retainer is assembled to the housing in the fully locked position YY sectional view of FIG. ZZ line sectional view of FIG. Perspective view of conventional retainer

  In the connector according to the present invention, the locking protrusion may be disposed further in the assembly direction of the retainer than the first cutout portion. According to this configuration, since the rising dimension of the side wall portion extending from the substrate portion to the locking projection is increased, the rigidity of the side wall portion can be reduced.

  In the connector according to the present invention, a curved surface portion having a curved cross-sectional shape intersecting with the assembly direction of the retainer may be formed on the inner surface of the recess. According to this configuration, stress concentration on the inner side surface of the recess when the side wall portion is elastically displaced is reduced as compared with the case where the inner side surface of the recess is configured by only a flat surface.

  In the connector according to the present invention, the curved surface portion may be formed continuously over the entire width direction region of the concave portion. According to this configuration, stress concentration on the inner side surface of the concave portion when the side wall portion is elastically displaced is reduced as compared with a case where a part of the inner side surface of the concave portion in the width direction is a flat surface.

  In the connector according to the present invention, the cross-sectional shape of the curved surface portion may be configured only by an arc having a constant curvature. According to this configuration, stress concentration on the inner side surface of the concave portion when the side wall portion is elastically displaced is reduced as compared with the case where the curved surface portion is configured by a plurality of curved surfaces having different curvatures.

  In the connector according to the present invention, the inner side surface of the side wall portion and the inner side surface of the concave portion may be smoothly continuous. According to this configuration, when the boundary portion between the inner side surface of the side wall portion and the inner side surface of the concave portion has a stepped shape, or when the inner side surface of the side wall portion and the inner side surface of the concave portion are connected at an angle As compared with, the stress concentration in the boundary portion between the inner side surface of the side wall portion and the inner side surface of the recess when the side wall portion is elastically displaced is alleviated.

<Example 1>
A first embodiment embodying the present invention will be described below with reference to FIGS. As shown in FIGS. 8 and 9, the connector A according to the first embodiment includes a housing 10, a plurality of terminal fittings 20 inserted into the housing 10, and a retainer 30. In the following description, in the front-rear direction, the right side in FIGS. For the up and down directions, the directions appearing in FIGS.

  The housing 10 is made of synthetic resin, and a plurality of terminal accommodating chambers 11 penetrating in the front-rear direction are formed in the housing 10 in parallel in the width direction. A lance 12 is formed in the terminal fitting 20 so as to extend forward in a cantilevered manner. 8 and 9, only one terminal accommodating chamber 11 and one terminal fitting 20 are shown for convenience.

  The housing 10 is formed with an attachment hole 13 that opens to the lower surface (outer surface) of the housing 10 and communicates from the lower surface of the housing 10 into the terminal accommodating chamber 11. The attachment hole 13 is formed over a range including a formation region of the plurality of terminal accommodating chambers 11 in the width direction. A retainer 30 to be described later is assembled upward in the mounting hole 13.

  As shown in FIGS. 10 and 11, a pair of symmetrical locking spaces 14 are formed at both ends in the width direction of the mounting hole 13. A detachment restricting portion 15 is formed on the side surface of the locking space 14 on the outer side in the width direction. Similarly, a temporary locking groove portion 16 and a final locking receiving portion 17 disposed above the temporary locking groove portion 16 are formed on the side surface in the width direction of the locking space 14.

  As shown in FIGS. 8 and 9, the terminal fitting 20 includes a rectangular tube portion 21, a tab 22 that protrudes forward from the rectangular tube portion 21, and an open barrel-shaped crimp portion 23 that continues to the rear end of the rectangular tube portion 21. And has an elongated shape in the front-rear direction as a whole. An electric wire 26 is fixed to the crimping portion 23. A stepped primary locking portion 24 is formed on the upper surface (outer surface) of the rectangular tube portion 21. The rear end portion of the rectangular tube portion 21 is a secondary locking portion 25 having a step shape.

  The terminal fitting 20 is inserted into the terminal accommodating chamber 11 from the rear of the housing 10. In the insertion process, the lance 12 interferes with the rectangular tube portion 21 and elastically bends upward. When the terminal fitting 20 is inserted to the normal position, the elastically restored lance 12 is locked to the primary locking portion 24, whereby the terminal fitting 20 is prevented from being pulled out. In a state where the terminal fitting 20 is secured by the lance 12, the secondary locking portion 25 is positioned along the front end edge in the opening region of the attachment hole 13.

  The retainer 30 is made of a synthetic resin, and is a single component including a substrate portion 31, a main body portion 32, and a pair of symmetrical side wall portions 33. The plate surface of the substrate portion 31 faces the horizontal direction perpendicular to the assembly direction of the retainer 30 with respect to the housing 10. The substrate portion 31 has a substantially rectangular shape that closes the opening area of the mounting hole 13 on the lower surface of the housing 10. The main body portion 32 has a shape protruding upward from a substantially front half region of the upper surface of the substrate portion 31, and has a long block shape in the width direction (left-right direction) as a whole. The main body portion 32 is formed over the entire width of the substrate portion 31. The main body portion 32 is formed with a plurality of retaining protrusions 35 (a retaining portion described in claims) in a form protruding from the upper end surface 34 thereof. The plurality of retaining protrusions 35 are arranged so as to correspond to the plurality of terminal accommodating chambers 11.

  The side wall portion 33 has a form that rises in a cantilevered manner from both side edges in the width direction on the upper surface of the substrate portion 31. The formation region of the side wall portion 33 in the front-rear direction (direction parallel to the insertion direction of the terminal fitting 20) is a range from the rear end of the substrate portion 31 to the rear end of the main body portion 32. And the area | region of the substantially lower half among the side wall parts 33 continues to the rear surface of the width direction both ends of the main-body part 32. As shown in FIG. In other words, the side wall 33 has a form protruding rearward from both widthwise ends of the main body 32. The outer surface of the side wall 33 is continuous with the outer surface of the main body 32. Further, on the outer surfaces of the main body portion 32 and the side wall portion 33, a temporary locking-dedicated projection 36 that is elongated in the front-rear direction and protrudes in a rib shape is formed.

  The side view shape of the side wall 33 is substantially square. The side wall portion 33 can be elastically bent so as to be displaced in the width direction with a base end portion (lower end portion) and a front end edge (vertical edge portion connected to the main body portion 32) in the front-rear direction as fulcrums. Yes. A shared protrusion 37 (a locking protrusion described in claims) is formed on the upper edge (rising edge) of the side wall 33. The common protrusion 37 protrudes in a rib shape toward the inner side surface of the side wall portion 33, and is elongated in the front-rear direction. The formation region of the common protrusion 37 in the front-rear direction extends over substantially the entire region of the side wall portion 33 in the front-rear direction.

  The retainer 30 is assembled upward with respect to the housing 10 in which the terminal fitting 20 is not inserted. In the state where the retainer 30 is assembled at the temporary locking position, as shown in FIG. 10, the temporary locking dedicated projection 36 is locked from above with respect to the detachment restricting portion 15, and the common projection 37 is temporarily locked groove portion 16. Lock to. By these locking actions, the retainer 30 is held at the temporary locking position. In the assembling process of the retainer 30, the side wall 33 is elastically displaced in the width direction immediately before reaching the locked state. In a state where the retainer 30 is held at the temporary locking position, the upper end of the retaining projection 35 stands by at the same position as the lower surface of the terminal accommodating chamber 11 or a slightly lower position.

  The terminal fitting 20 is inserted into the terminal accommodating chamber 11 with the retainer 30 held at the temporary locking position. When inserting the terminal fitting 20, as shown in FIG. 8, the retaining projection 35 of the retainer 30 is retracted outside the terminal accommodating chamber 11, so that the terminal fitting 20 is connected to the retaining projection 35 (retainer 30). There is no interference. After all the terminal fittings 20 are inserted into the normal positions, the retainer 30 at the temporary locking position is pushed upward into the main locking position.

  In a state where the retainer 30 is assembled at the final locking position, as shown in FIG. 11, the common projection 37 is locked to the final locking receiving portion 17 from above. By this locking action, the retainer 30 is held at the final locking position. In the state where the retainer 30 is held at the final locking position, the retaining projection 35 is engaged with the secondary locking portion 25 of the terminal fitting 20 that has advanced into the terminal accommodating chamber 11 from the rear as shown in FIG. Stop. Due to the primary locking action by the lance 12 and the secondary locking action by the retainer 30, the terminal fitting 20 is securely held in the retaining state.

  The retainer 30 includes a means for preventing damage to the common protrusion 37. As shown in FIGS. 1 to 7, the breakage prevention means includes a pair of left and right symmetrical recesses 38, a pair of left and right symmetrical notches 41, and a pair of left and right symmetrical notches 42. Has been. The concave portion 38 has a shape in which both end portions in the width direction of the rear surface of the main body portion 32 are recessed in a vertical groove shape. The position where the recess 38 is formed is a boundary with the inner surface of the side wall 33 on the rear surface of the main body 32. The lower end surface of the concave portion 38 is continuous with the upper surface of the substrate portion 31 in the same shape (the same height). The upper end of the recess 38 is lower than the shared protrusion 37.

  As shown in FIG. 6, the inner surface of the recess 38 is composed of a pair of flat surface portions 39 and one curved surface portion 40 that face each other in the width direction. The pair of flat portions 39 is elongated in the vertical direction, and is disposed along the opening edge of the recess 38 on the rear surface of the main body portion 32. Of the pair of flat portions 39, the flat portion 39 positioned outside in the width direction is continuous with the front end portion of the inner surface of the side wall portion 33 in a flush manner. Further, by forming the recesses 38, outer wall portions 43 that are continuous with the front end portions of the side wall portions 33 are formed at both ends in the width direction of the main body portion 32. The outer wall 43 constitutes a recess 38, the inner surface of the outer wall 43 faces the recess 38, and the outer surface of the outer wall 43 constitutes the outer surface of the main body 32.

  The horizontal cross-sectional shape of the curved surface portion 40 (cross-sectional shape cut at right angles to the assembly direction of the retainer 30) is a semicircular arc shape with a constant curvature. The curved surface portion 40 is continuous over the entire width direction region of the recess 38. Further, the radius of curvature of the cross-sectional shape of the curved surface portion 40 is the same dimension as 1/2 of the width dimension of the recess 38. Then, both ends in the width direction of the curved surface portion 40 are tangentially continuous with the pair of flat surface portions 39. Therefore, the width dimension of the recess 38 is set to be smaller than the depth dimension of the recess 38.

  The first notches 41 are formed at both ends in the width direction of the main body 32. The first notch 41 communicates the upper end of the recess 38 (the end of the recess 38 opposite to the substrate 31) to the outer surface of the main body 32. The formation area of the first notch 41 in the front-rear direction is a range from the rear surface of the main body 32 to a position slightly ahead of the front end of the recess 38. On the outer surface of the main body 32, the first cutout 41 opens in a slit shape in the front-rear direction. By forming the first cutout portion 41, the upper end portion of the outer wall portion 43 is separated from the main body portion 32. Moreover, the 1st notch part 41 is formed in the height lower than a latching protrusion. In other words, the shared protrusion 37 is disposed further (upward) in the assembly direction of the retainer 30 than the first cutout portion 41.

  Similarly to the first notch 41, the second notch 42 is also formed at both ends in the width direction of the main body 32. The second notch portion 42 communicates the internal space defined by the inner surface of the side wall portion 33 and the rear surface of the main body portion 32 of the retainer 30 to the outer surface of the retainer 30. On the outer surface of the main body portion 32, the second cutout portion 42 opens in a vertical slit shape. The lower end portion of the second notch portion 42 communicates with the rear end portion of the first notch portion 41. The upper end portion of the second cutout portion 42 is opened upward from the retainer 30. That is, the 2nd notch part 42 has the form which isolate | separated the common protrusion 37 and the main-body part 32 in the front-back direction.

  According to the breakage prevention means having the above-described configuration, the outer wall portion 43 extends forward from the front end portion of the side wall portion 33 by forming the concave portion 38. In addition, since the first cutout portion 41 is formed, the upper end portion of the outer wall portion 43 is separated from the main body portion 32 and can be relatively displaced with respect to the main body portion 32. Furthermore, by forming the second cutout portion 42, the upper end portion (shared protrusion 37) of the side wall portion 33 is separated from the main body portion 32 and can be relatively displaced with respect to the main body portion 32.

  According to this configuration, the inner side surface of the side wall portion 33 is directly connected to the rear surface of the main body portion 32, and the front end portion of the common projection 37 is directly connected to the rear end portion of the main body portion 32. Compared with the case where it exists, the bending rigidity of the side wall part 33 when receiving the external force of the width direction is low. Therefore, when the side wall 33 is elastically deformed in the width direction, the stress generated in the side wall 33 is relieved, and the stress generated in the locking projection is greatly reduced.

  The connector A of the first embodiment is assembled to the housing 10, a plurality of terminal fittings 20 inserted in parallel in the width direction in the housing 10, and a direction intersecting the insertion direction of the terminal fitting 20 with respect to the housing 10. And a retainer 30. The retainer 30 includes a substrate portion 31, a main body portion 32, and a pair of left and right side wall portions 33. The board part 31 has a form in which the plate surface is oriented in a direction crossing the assembly direction of the retainer 30. The main body 32 has a form that rises from the substrate 31 in the same direction as the assembly direction of the retainer 30. At the rising end of the main body portion 32, a retaining protrusion 35 is formed for retaining the terminal fitting 20 by being locked to the terminal fitting 20.

  The pair of side wall portions 33 rises from both edges in the width direction of the substrate portion 31 in the same direction as the assembly direction of the retainer 30, and substantially parallel to the insertion direction of the terminal fitting 20 from both width direction end portions of the main body portion 32 (rear side). F) It is a protruding form. A common protrusion 37 that holds the retainer 30 in an assembled state with respect to the housing 10 by being engaged with the housing 10 is formed at the rising end of the side wall 33.

  A concave portion 38 having a groove shape substantially parallel to the assembling direction of the retainer 30 is formed at a boundary portion between the width direction end portion of the main body portion 32 and the inner surface of the side wall portion 33. In addition, a first notch 41 is formed at the end in the width direction of the main body 32 so as to communicate the upper end of the recess 38 opposite to the substrate 31 to the outer surface of the main body 32. Further, the retainer 30 has a form communicating with the first cutout portion 41, and a second cutout portion 42 that separates the common protrusion 37 from the main body portion 32 is formed.

  In the connector A of the present embodiment, a recess 38 is formed at the boundary with the inner surface of the side wall 33 among the widthwise ends of the main body 32, and the end of the recess 38 opposite to the substrate 31 is the first. The notch 41 communicates with the outer surface of the main body 32, and the locking protrusion is separated from the main body 32 by the second notch 42 communicating with the first notch 41. Thereby, the outer wall part 43 which comprises the recessed part 38 can be elastically displaced integrally with the side wall part 33. As shown in FIG. According to the connector A of the present embodiment, a region that can be elastically displaced integrally with the side wall portion 33 is secured to reduce the rigidity of the side wall portion 33, and the locking projection is separated from the main body portion 32. It is possible to prevent the locking protrusion from being damaged when a load, impact, or the like acts on the protrusion.

  Further, since the common protrusion 37 is arranged ahead of the first cutout portion 41 in the assembly direction of the retainer 30, a large rising dimension of the side wall portion 33 from the substrate portion 31 to the locking protrusion is ensured. . Thereby, the rigidity of the side wall part 33 can be reduced.

  Further, a curved surface portion 40 having a curved cross-sectional shape intersecting with the assembly direction of the retainer 30 is formed on the inner side surface of the recess 38. According to this configuration, stress concentration on the inner side surface of the recess 38 when the side wall 33 is elastically displaced is reduced as compared with the case where the inner side surface of the recess 38 is configured by only a flat surface.

  Further, the curved surface portion 40 is continuously formed over the entire width direction region of the concave portion 38. According to this configuration, the stress concentration on the inner surface of the recess 38 when the side wall 33 is elastically displaced is reduced compared to the case where a part of the inner surface of the recess 38 in the width direction is a flat surface.

  Further, the cross-sectional shape of the curved surface portion 40 is configured only by an arc having a constant curvature. According to this configuration, stress concentration on the inner side surface of the recess 38 when the side wall portion 33 is elastically displaced is reduced as compared with the case where the curved surface portion 40 is configured by a plurality of curved surfaces having different curvatures.

  Further, the inner side surface of the side wall portion 33 and the inner side surface (plane portion 39) of the recess 38 are smoothly continuous. According to this configuration, the boundary portion between the inner side surface of the side wall portion 33 and the inner side surface of the recess portion 38 is stepped, or the inner side surface of the side wall portion 33 and the inner side surface of the recess portion 38 are connected at an angle. Compared to the case where the side wall portion 33 is elastically displaced, the stress concentration at the boundary portion between the inner side surface of the side wall portion 33 and the inner side surface of the concave portion 38 is alleviated.

<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 lower end of the recess is the same height as the upper surface of the substrate portion, but the lower end of the recess may be located above the upper surface of the substrate portion.
(2) In the above embodiment, the recess, the first notch, and the second notch are formed at both ends in the width direction of the retainer, but the recess, the first notch, and the second notch are in the width direction of the retainer. You may form only in either one edge part.
(3) In the above embodiment, the width dimension of the recess is set to be smaller than the depth dimension of the recess, but the width dimension of the recess may be the same as the depth dimension or larger than the depth dimension.
(4) In the above embodiment, the common protrusion (locking protrusion) is disposed further in the retainer assembling direction than the first notch, but the common protrusion (locking protrusion) is the retainer assembling direction. In, it may be arranged at the same position as the first notch.
(5) In the above-described embodiment, the cross-sectional shape of the curved surface portion is a semicircular shape, but the cross-sectional shape of the curved surface portion may be an arc shape having a constant curvature whose circumference is less than a semicircle.
(6) In the above embodiment, the cross-sectional shape of the curved surface portion is an arc shape having a constant curvature, but the cross-sectional shape of the curved surface portion is a shape in which a plurality of curves having different curvatures are connected, such as a substantially semi-ellipse. There may be.
(7) In the above-described embodiment, the inner side surface of the concave portion is constituted by a flat surface portion and a curved surface portion. However, the inner side surface of the concave portion may be constituted only by a curved surface portion or may be constituted only by a flat surface portion.
(8) Although the side wall portion protrudes backward from the main body portion in the above embodiment, the present invention can also be applied to the case where the side wall portion protrudes forward from the main body portion.
(9) In the above-described embodiment, the common protrusion (locking protrusion) protrudes toward the inner surface of the side wall, but in the present invention, the common protrusion (locking protrusion) protrudes toward the outer surface of the side wall. It can also be applied to cases.
(10) In the above embodiment, the temporary locking dedicated projection is formed on the side wall, but the present invention can also be applied to the case where the temporary locking dedicated projection is formed on the outer surface of the main body. it can.

A ... Connector 10 ... Housing 20 ... Terminal fitting 30 ... Retainer 31 ... Substrate part 32 ... Main body part 33 ... Side wall part 35 ... Retaining protrusion (Retaining part)
37 ... Common projection (locking projection)
38 ... concave part 40 ... curved surface part 41 ... first notch part 42 ... second notch part

Claims (6)

A housing;
A plurality of terminal fittings inserted in parallel in the width direction in the housing;
A retainer assembled to the housing in a direction intersecting with the insertion direction of the terminal fitting;
Configuring the retainer, and a board portion having a plate surface in a direction intersecting with the assembly direction of the retainer;
Configuring the retainer, and a body portion in a form rising from the substrate portion in the same direction as the assembly direction of the retainer;
A retaining portion that is formed at the rising end of the main body and retains the terminal fitting by being locked to the terminal fitting,
The retainer is configured to rise from both edges in the width direction of the substrate portion in the same direction as the assembly direction of the retainer, and protrude substantially parallel to the insertion direction of the terminal fitting from both width direction ends of the main body portion. A pair of side walls,
A locking protrusion formed on the rising end of the side wall, and holding the retainer in an assembled state with respect to the housing by locking to the housing;
A groove-shaped recess formed at a boundary portion with the inner surface of the side wall portion of the width direction end portion of the main body portion, and substantially parallel to the assembly direction of the retainer;
A first notch formed at the widthwise end of the main body and communicating with the outer surface of the main body at the end opposite to the substrate in the recess;
A connector comprising: a second cutout portion that communicates with the first cutout portion and that separates the locking protrusion from the main body portion.   2. The connector according to claim 1, wherein the locking protrusion is disposed ahead of the first cutout portion in the assembly direction of the retainer.   The connector according to claim 1 or 2, wherein a curved surface portion having a curved cross-sectional shape intersecting with the assembly direction of the retainer is formed on an inner surface of the recess.   The connector according to claim 3, wherein the curved surface portion is continuously formed over the entire width direction region of the concave portion.   The connector according to claim 4, wherein the cross-sectional shape of the curved surface portion is constituted only by an arc having a constant curvature.   The connector according to any one of claims 1 to 5, wherein an inner surface of the side wall portion and an inner surface of the concave portion are smoothly continuous.

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