connector

Abstract

To provide a connector capable of enhancing a tenacity against a terminal metal fitting, and avoiding an increase of the size.SOLUTION: A box part 61 of a terminal metal fitting 60, includes: an inner wall part 69 that segments an inner part space; and an outer wall part 71 that is arranged so as to be overlapped to an outer peripheral surface of the inner wall part 69. The outer wall part 71 includes a return part 87 that is coated to one end side of a width direction of a first plate part 72 of the inner wall part 69. A Lance 22 includes: an inner side engagement surface 31 that can be engaged to a plate thickness surface of the first plate part 72; an outer side engagement surface 32 that can be engaged to the plate thickness surface of the return part 87; and a tip end projection part 33 that is arranged so as to be paralleled to the outer side engagement surface 32 on the other end side of the width direction of the outer side engagement surface 32, is projected to a front side from the outer side engagement surface 32, and is opposite to the other end side of the width direction of the first plate part 72 from the outside.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to connectors. [Background technology]

[0002] The connector described in Patent Document 1 includes a housing having a cavity (terminal receiving hole) with a lance (terminal locking lance) protruding therefrom, and a terminal fitting inserted into the cavity and locked by the lance. The terminal fitting has a cylindrical box portion (terminal fitting portion). The box portion has a bottom wall, which has a double-wall structure with an inner and outer wall overlapping each other. The lance has a locking surface located opposite the thick-wall surface of the double wall of the bottom wall. The lance also has a tip protrusion that protrudes forward from the locking surface and faces the outer surface of the outer wall of the double wall. Connectors equipped with terminal fittings locked by lances are also disclosed in Patent Documents 2 to 5. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-79721 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-209222 [Patent Document 3] Japanese Patent Application Publication No. 8-148214 [Patent Document 4] Japanese Patent Application Laid-Open No. 2010-55880 [Patent Document 5] Patent Publication No. 2021-47995 Summary of the Invention [Problem to be solved by the invention]

[0004] In the case of Patent Document 1, the locking surface of the lance is locked not by a single wall but by the thick plate surface of a double wall, thereby increasing the holding force to the terminal fitting. However, in the case of Patent Document 1, the locking surface and the tip protrusion are stacked in the height direction, which is the overlapping direction of the double walls, so there was a concern that the lance would become larger in the height direction, and therefore the connector would become larger in the height direction.

[0005] Therefore, an object of the present disclosure is to provide a connector that can increase the holding force for terminal fittings while avoiding an increase in size. [Means for solving the problem]

[0006] The connector of the present disclosure comprises a housing having a plate-shaped terminal fitting having a cylindrical box portion extending in the front-to-rear direction, a cavity capable of accommodating the terminal fitting, and an elastically deformable lance protruding forward from the inner wall of the cavity, wherein the box portion has an inner wall portion that partitions an internal space, and an outer wall portion arranged to overlap the outer surface of the inner wall portion, the inner wall portion having a first plate portion along a width direction that intersects the overlapping direction of the inner wall portion and the front-to-rear direction and the outer wall portion, and the outer wall portion has a return portion that covers one end side of the first plate portion in the width direction, and the lance has an inner locking surface that can engage with the plate thickness surface of the first plate portion, an outer locking surface that can engage with the plate thickness surface of the return portion, and a tip protrusion that is arranged alongside the outer locking surface at the other end side of the outer locking surface in the width direction, protrudes forward from the outer locking surface, and faces the other end side of the first plate portion in the width direction from the outside. [Effects of the Invention]

[0007] According to the present disclosure, it is possible to provide a connector that can increase the holding force for terminal fittings and avoid an increase in size. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view of a connector according to a first embodiment of the present disclosure, with the housing cut away to show a state in which a terminal fitting is inserted into a cavity of the housing and is arranged so as to be lockable with a lance. [Figure 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. [Figure 3] FIG. 3 is a view corresponding to FIG. 2, illustrating a state in which a rearward pulling force acts on the terminal fitting and the lance is displaced in the reverse direction. [Figure 4] FIG. 4 is a side cross-sectional view of the state shown in FIG. [Figure 5] FIG. 5 is a perspective view of the front part of the terminal fitting as seen obliquely from below. [Figure 6] FIG. 6 is a front view showing a guide portion formed at the opening edge of the cavity on the front surface of the housing. [Figure 7] FIG. 7 is a perspective view of the lance protruding into the cavity as viewed obliquely from the upper right. [Figure 8] FIG. 8 is a perspective view of the lance protruding into the cavity as viewed obliquely from above left. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of the embodiments of the present disclosure] First, embodiments of the present disclosure will be listed and described. The connector of the present disclosure comprises: (1) A housing having a plate-shaped terminal fitting having a cylindrical box portion extending in the front-to-rear direction, a cavity capable of accommodating the terminal fitting, and an elastically deformable lance protruding forward from the inner wall of the cavity, wherein the box portion has an inner wall portion that partitions an internal space, and an outer wall portion arranged to overlap the outer surface of the inner wall portion, the inner wall portion having a first plate portion along a width direction that intersects the overlapping direction of the inner wall portion and the front-to-rear direction and the outer wall portion, and the outer wall portion has a return portion that covers one end side of the first plate portion in the width direction, and the lance has an inner locking surface that can engage with the plate thickness surface of the first plate portion, an outer locking surface that can engage with the plate thickness surface of the return portion, and a tip protrusion that is arranged alongside the outer locking surface at the other end side of the outer locking surface in the width direction, protrudes forward from the outer locking surface, and faces the other end side of the first plate portion in the width direction from the outside.

[0010] When a backward pulling force is applied to the terminal, the inner locking surface of the lance locks against the thick surface of the first plate, and the outer locking surface of the lance also locks against the thick surface of the barb, thereby increasing the holding force on the terminal. Furthermore, the tip protrusion abuts on the first plate, preventing the lance from reversing and the terminal from moving backward. Furthermore, because the tip protrusion and the outer locking surface are aligned in the width direction, the lance does not need to be large in height, which in turn helps prevent the connector from becoming too large.

[0011] (2) The lance has a lance body connected to the inner wall of the cavity and extending in the fore-and-aft direction, and a locking protrusion protruding from the lance body toward the inside of the cavity, and it is preferable that the inner locking surface is arranged on the front surface of the locking protrusion, and the outer locking surface and the tip protrusion are arranged side by side in the width direction on the front surface of the lance body.

[0012] Because the inner locking surface is located on the front surface of the locking protrusion, a large locking margin can be secured relative to the plate thickness surface of the first plate portion. Because the front surface of the lance body is cut out, the barb fits inside the cutout, stabilizing the locking state between the lance and the barb.

[0013] (3) The positions of the center of the box portion and the center of the locking projection in the width direction may be aligned inside the cavity.

[0014] Since the locking protrusion is not misaligned (offset) in the width direction relative to the box portion, the die-cut hole portion for forming the locking protrusion (refer to cut-out portion 41 shown in the following embodiment 1, Figure 6) can be properly formed in the widthwise center to match the guide shape of the mating terminal fitting formed on the front surface of the housing.

[0015] (4) The box portion preferably has a second plate portion at a position opposite the first plate portion, and the second plate portion preferably has an excessive deflection prevention portion that is bent at its rear end and faces the lance side.

[0016] When a rearward pulling force acts on the terminal fitting, the lance abuts against the excessive deflection restricting portion, thereby preventing the lance from being excessively deflected.

[0017] [Details of the embodiments of the present disclosure] Specific examples of the present disclosure will be described below with reference to the drawings. However, the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0018] <Embodiment 1> The connector 10 according to the first embodiment includes a housing 20 made of synthetic resin and terminal fittings 60 made of conductive metal. As shown in FIG. 1, the terminal fittings 60 are accommodated in the housing 20. The housing 20 is mated with a mating housing (not shown). In the following description, the front side of the housing 20, which faces the mating connector at the start of mating, is referred to as the front. The up-down direction is based on the up-down direction in each figure. The left-right direction is based on the left-right direction in FIGS. 2 and 3. In FIGS. 1 to 3, the front, upper side, and right side are indicated by the symbols "X," "Y," and "Z," respectively. The up-down direction and the left-right direction are synonymous with the height direction and the width direction, respectively. These directional references are for convenience and do not necessarily coincide with the directional references when the connector 10 is installed in a vehicle (not shown).

[0019] (Terminal fittings) The terminal fitting 60 is formed by bending a single metal plate or the like into a shape elongated in the front-to-rear direction, as shown in Figures 1 and 4. The terminal fitting 60 has a box portion 61 on the front side, barrel portions 62 and 63 on the rear side, and a connecting portion 64 between the box portion 61 and the barrel portions 62 and 63. The terminal fitting 60 also has a band-shaped base portion 65 extending over its entire length in the front-to-rear direction. The base portion 65 constitutes a part of each of the box portion 61, the connecting portion 64, and the barrel portions 62 and 63.

[0020] The barrel portions 62, 63 have a wire barrel portion 62 on the front side and an insulation barrel portion 63 on the rear side. The wire barrel portion 62 is crimped and electrically connected to the core wire 52 exposed by removing the coating 51 at the end portion of the electric wire 50. The insulation barrel portion 63 is crimped and mechanically connected to the coating 51 at the end portion of the electric wire 50.

[0021] As shown in Figure 5, the connecting portion 64 has a strip-shaped connecting body portion 66 extending in the front-rear direction, and a pair of side portions 67 that are bent downward from both left and right ends of the connecting body portion 66 and arranged parallel to each other. The connecting body portion 66 forms the middle portion of the base portion 65 in the front-rear direction. The rear end of each side portion 67 is connected to the wire barrel portion 62. The front end of each side portion 67 is connected to a fourth plate portion 75 and a sixth plate portion 83, respectively, which will be described later. The space below the connecting portion 64 forms a receiving space 68 into which a locking protrusion 26 of the lance 22, which will be described later, can enter.

[0022] 2 and 3, the box portion 61 has an inner wall portion 69 that defines an inner space 70, and an outer wall portion 71 that is disposed radially outward of the inner wall portion 69 and along the outer surface of the inner wall portion 69. The inner wall portion 69 has a first plate portion 72 that is disposed along the left-right direction, a second plate portion 73 that is disposed above and parallel to the first plate portion 72, a third plate portion 74 that extends in the up-down direction and is connected to the right ends of the first plate portion 72 and the second plate portion 73, and a fourth plate portion 75 that rises from the left end of the first plate portion 72 and is disposed parallel to the third plate portion 74.

[0023] 4, the first plate portion 72 has a receiving portion 76 at its intermediate portion in the front-rear direction, the receiving portion 76 having a shape that bulges out toward the internal space 70. The upper surface of the receiving portion 76 is disposed along the front-rear direction.

[0024] As shown in Figures 2, 3, and 5, the second plate portion 73 has a fixing portion 78 that protrudes leftward near the rear end and enters a fixing hole 77 formed in the upper left corner of the box portion 61. The second plate portion 73 has a shape that extends forward from the fixing hole 77 in a cantilevered manner, and as shown in Figure 4, has a contact portion 79 that protrudes downward from the front end side. The second plate portion 73 is elastically deformable in the vertical direction, with the fixing hole 77 side where it enters the fixing hole 77 as a fulcrum. When the housing 20 is mated with the mating housing, a male tab 100 of the mating terminal fitting enters between the contact portion 79 of the second plate portion 73 and the receiving portion 76 from the front, and when the second plate portion 73 is in an elastically deformed state, the contact portion 79 is electrically connected to the male tab 100.

[0025] As shown in Figures 4 and 5, the rear end of the second plate portion 73 is disposed along the inner surface of the connecting body portion 66. The second plate portion 73 has, at its rear end, an excessive deflection restricting portion 81 that is bent downward and hangs down. As shown in Figures 2 and 3, the excessive deflection restricting portion 81 has a rectangular shape when viewed from the front, and is disposed in the upper right corner of the inner space 70. The lower end of the excessive deflection restricting portion 81 faces the receiving space 68 above the lower ends of the side portions 67 (see Figure 5).

[0026] As shown in Figures 2 and 3, the outer wall portion 71 has a fifth plate portion 82 that extends to the right from the upper end of the fourth plate portion 75 and overlaps the outer surface (top surface) of the second plate portion 73, a sixth plate portion 83 that extends downward from the right end of the fifth plate portion 82 and overlaps the outer surface (right surface) of the third plate portion 74, and a return portion 87 that bends to the left and extends a short distance from the lower end of the rear end of the sixth plate portion 83.

[0027] 5, the return portion 87 overlaps the outer surface of the rear end portion of the first plate portion 72 so as to partially cover the outer surface (lower surface) of the right end side (one end side in the width direction) of the rear end portion of the first plate portion 72. The rear end surface (thickness surface) of the return portion 87 and the rear end surface (thickness surface) of the first plate portion 72 are arranged side by side at the same position in the front-to-rear direction (see FIG. 4).

[0028] 5, the outer wall 71 has a front plate 88 that extends leftward from the lower end of the front end of the sixth plate 83 and overlaps the outer surface of the front end of the first plate 72. The sixth plate 83 has a protruding piece 89 that protrudes downward near the rear end. The protruding piece 89 is positioned forward of the return portion 87 with its plate surface facing left and right. The protruding piece 89 can function as a stabilizer that guides the insertion of the terminal fitting 60 into the housing 20.

[0029] (housing) 1 and 4, the housing 20 has a cavity 21 extending in the front-to-rear direction. The front and rear ends of the cavity 21 open to the front and rear surfaces of the housing 20, respectively. Although not shown, a plurality of cavities 21 are formed in the housing 20. Also, although not shown, the housing 20 has a lock arm that engages with a mating housing and holds the housing 20 and the mating housing in a mated state.

[0030] The housing 20 has a lance 22 that protrudes forward from the lower surface of the inner wall of the cavity 21. The lance 22 is elastically deformable in the vertical direction with a base end 23 that is connected to the lower surface of the inner wall of the cavity 21 as a fulcrum. The cavity 21 has a deflection space 24 below the lance 22 that allows elastic displacement of the lance 22.

[0031] The lance 22 has a lance body 25 extending forward from a base end 23 and a locking projection 26 projecting from the upper surface of the lance body 25 into the cavity 21 .

[0032] 6, a first pressed surface 27 and a second pressed surface 28 are formed on the upper surface of the lance body 25 at both left and right ends of the locking projection 26. The first pressed surface 27 and the second pressed surface 28 are arranged along the front-rear direction and are pressed by a jig (not shown) when the locked state of the lance 22 is released.

[0033] 8, the lance body 25 has a guide slope 29 formed by cutting out the upper left front corner. The guide slope 29 is continuous with the first pressed surface 27 and serves to guide the jig to the first pressed surface 27. As shown in FIG. 6, the second pressed surface 28 is positioned lower than the first pressed surface 27 to avoid interference with the protruding piece 89 of the terminal fitting 60. As shown in FIGS. 7 and 8, the rear surface of the locking protrusion 26 is inclined forward. The front surface of the locking protrusion 26 is configured as an inner locking surface 31 that can lock the rear end surface (thickness surface) of the first plate portion 72 of the terminal fitting 60. The inner locking surface 31 extends in the left-right direction and, as shown in FIGS. 1 and 4, is positioned in a direction that is inclined relative to the up-down direction so that its upper end protrudes forward. As shown in FIG. 6, the inner locking surface 31 has a trapezoidal shape with a wider lower end when viewed from the front, and is positioned in the center of the lance 22 in the left-right direction.

[0034] As shown in Figure 6, the front surface of the lance body 25 has an outer locking surface 32 that can lock onto the rear end surface (thickness surface) of the barb 87 of the terminal fitting 60. The outer locking surface 32 is continuous with the inner locking surface 31 below it without any step, and is located forward and to the left of the second pressed surface 28. The outer locking surface 32 is located on the front surface of the lance body 25, offset to the right of the center of the lance body 25 in the left-right direction. The left-right dimension (width dimension) of the outer locking surface 32 is smaller than the left-right dimension of the inner locking surface 31. Also, as shown in Figure 1, the upper end of the outer locking surface 32 is inclined forward and is continuous with the inner locking surface 31 at the same inclination angle.

[0035] 6 to 8, the lance body 25 has a tip projection 33 that projects forward from the outer locking surface 32, at a position to the left of the outer locking surface 32 and aligned with the outer locking surface 32 in the left-right direction. The tip projection 33 is plate-shaped and aligned with the outer locking surface 32 in the left-right direction. The tip projection 33 and the outer locking surface 32 are positioned so as to overlap each other in the up-down direction. Specifically, the outer locking surface 32 is positioned within the up-down range of the tip projection 33.

[0036] The outer locking surface 32 is disposed so as to intersect and be continuous with the right side surface of the tip projection 33. As shown in Fig. 7, the lance body 25 has a notched recess 34 formed by the right side surface of the tip projection 33 and the outer locking surface 32, which has an L-shaped cross section.

[0037] 2 and 3, the upper surface of the tip projection 33 forms an opposing surface 35 that faces and can come into contact with the outer surface (lower surface) of the first plate portion 72 of the terminal fitting 60. As shown in Fig. 8, the opposing surface 35 of the tip projection 33 intersects with the inner locking surface 31 and is a flat surface that is continuous with the first pressed surface 27 in the front-to-rear direction without any steps.

[0038] 1 and 6, the housing 20 has a front wall 37 that closes the front of the cavity 21, leaving the tab insertion hole 36. A guide portion 38 that tapers and widens from the opening of the tab insertion hole 36 is formed on the front surface of the front wall 37. The guide portion 38 serves to guide the male tab 100 of the mating terminal fitting into the tab insertion hole 36. Although not shown, the male tab 100 is inserted through the tab insertion hole 36 into the inside of the box portion 61 of the terminal fitting 60 arranged in the cavity 21 for connection.

[0039] Furthermore, a die-removal hole 39 resulting from the removal of a die (not shown) that forms the lance 22 is formed in the front surface of the housing 20. The die-removal hole 39 communicates with the deflection space 24 inside the housing 20. As shown in FIG. 6, the die-removal hole 39 includes a cutout portion 41 that is shaped by cutting out the middle portion in the left-right direction at the lower end of the guide portion 38. The inner locking surface 31 of the locking projection 26 is visible from the front through the cutout portion 41.

[0040] (Connector function) The terminal fitting 60, with the electric wire 50 connected to the barrel portions 62, 63, is inserted into the cavity 21 of the housing 20 from the rear. During the insertion of the terminal fitting 60, the box portion 61 slides on the rear surface of the locking protrusion 26, and the lance 22 elastically deforms into the deflection space 24. As shown in Figures 1 and 4, when the box portion 61 abuts against the rear surface of the front wall 37 and reaches a position where the insertion of the terminal fitting 60 is stopped (normal insertion position), the lance 22 elastically returns to its original position, and the locking protrusion 26 enters the receiving space 68, so that the inner locking surface 31 of the locking protrusion 26 is positioned opposite the rear end surface of the box portion 61 so as to be able to come into contact with it. 2, the upper end of the inner locking surface 31 of the locking projection 26 faces the rear end surface of the first plate portion 72 in the left-right middle portion in a manner that allows contact with it along the left-right direction, and the right end of the inner locking surface 31 of the locking projection 26 faces the left end of the barb portion 87 in a manner that allows contact with it. Note that when the box portion 61 abuts against the rear surface of the front wall 37 and the lance 22 is in its natural state, the outer locking surface 32 is positioned below the barb portion 87. The lower end of the excessive deflection restricting portion 81 faces the upper surface of the locking projection 26.

[0041] In this state, the wire 50 drawn out from the housing 20 may be pulled backward, causing a backward pulling force to act on the terminal 60. When this pulling force acts, the terminal 60 retracts from the state shown in FIGS. 1 and 4 until the rear end surface of the box portion 61 contacts the inner locking surface 31 of the locking projection 26. As the pulling force continues to act and the terminal 60 further retracts, the rear end surface of the first plate 72 slides toward the lower end of the inner locking surface 31, causing the lance 22 to elastically deform upward, reversing its orientation. As a result, as shown in FIG. 3 , the rear end surface of the first plate 72 is engaged with the lower end of the inner locking surface 31 across a wide area in the left-right direction. The barb 87 then enters the recess 34, and the rear end surface of the barb 87 engages with the outer locking surface 32. This restricts further retraction of the terminal 60, preventing it from slipping out of the cavity 21. At this time, the opposing surface 35 of the tip projection 33 abuts against the outer surface (lower surface) of the rear end portion of the first plate portion 72. Furthermore, the upper surface of the locking projection 26 can also abut against the lower end of the excessive deflection restricting portion 81. In this way, the lance 22 abuts against the first plate portion 72 and the excessive deflection restricting portion 81, and the upward displacement of the lance 22 is suppressed, thereby restricting the retreat of the terminal fitting 60. As a result, the terminal fitting 60 is reliably prevented from coming out of the cavity 21.

[0042] As described above, according to the first embodiment, when a rearward pulling force is applied to the terminal fitting 60, not only the inner locking surface 31 of the lance 22 is locked with the rear end surface of the first plate portion 72, but also the outer locking surface 32 of the lance 22 is locked with the rear end surface of the barb 87, thereby increasing the holding force on the terminal fitting 60. Furthermore, the tip projection 33 abuts against the outer surface of the first plate portion 72, thereby reliably preventing the lance 22 from displacing upward and the terminal fitting 60 from moving backward. Furthermore, because the tip projection 33 and the outer locking surface 32 are arranged side by side in the left-right direction, the lance 22 does not need to be large in height, which in turn prevents the connector 10 from becoming large.

[0043] Furthermore, since the inner locking surface 31 is located on the front surface of the locking projection 26, a large locking margin can be secured with respect to the rear end surface of the first plate portion 72. Furthermore, the barb portion 87 fits inside the notched recess 34 of the lance body 25, thereby stabilizing the locking state between the lance 22 and the barb portion 87.

[0044] Furthermore, in the case of the first embodiment, as shown in Figures 2 and 3, the left-right centers of the box portion 61 and the locking protrusion 26 are located at the same position in the left-right direction. Therefore, the locking protrusion 26 is not misaligned (offset) in the left-right direction relative to the box portion 61, and the cutout portion 41 can be formed in the left-right center (middle portion) of the lower end of the guiding portion 38, as shown in Figure 6. This allows the guiding portion 38 to properly perform its function of guiding the male tab 100.

[0045] Furthermore, when a rearward pulling force acts on the terminal fitting 60, the lance 22 also abuts against the excessive deflection restricting portion 81, thereby preventing the lance 22 from being excessively deflected.

[0046] [Another embodiment of the present disclosure] The first embodiment disclosed herein should be considered to be illustrative in all respects and not restrictive. In the first embodiment, the inner and outer locking surfaces are arranged continuously on the lance without any step. In contrast, in other embodiments, the inner contact surface and the outer locking surface may be arranged on the lance with a step therebetween. In the first embodiment, the inner locking surface is disposed at an angle on the front surface of the locking protrusion. However, the inner locking surface may be disposed along the vertical direction on the front surface of the locking protrusion. [Explanation of symbols]

[0047] 10...Connector 20…Housing 21...cavity 22...Lance 23...Proximal end 24...Deflection space 25...Lance body 26...Latching protrusion 27...First pressed surface 28...Second pressed surface 29...Guidance slope 31...Inner locking surface 32...Outer locking surface 33...Tip protrusion 34...Notched recess 35...opposing surface 36...Tab insertion hole 37...Front wall 38...Invitation Section 39...Mold hole 41...Resection part 50...Electric wire 51...Covering 52...Core wire 60...Terminal fitting 61...Hakobe 62...Wire barrel part (barrel part) 63...Insulation barrel part (barrel part) 64...Connection part 65...Base 66...Connecting body 67...Side 68...Receptive space 69…Inner wall 70...Inner space 71...Outer wall part 72…First plate part 73…Second plate part 74...Third plate part 75…4th plate part 76...Receiving part 77…Fixing hole 78…Fixed part 79...Contact point 81...Excessive deflection control section 82...5th plate part 83…6th plate part 87...Returned part 88...Front plate part 89...Protruding piece part 100...Male tab

Claims

1. a housing having a plate-like terminal fitting having a cylindrical box portion and extending in a front-rear direction, a cavity capable of accommodating the terminal fitting, and an elastically deformable lance protruding forward from an inner wall of the cavity; The box portion has an inner wall portion that partitions an internal space and an outer wall portion that is arranged to overlap an outer surface of the inner wall portion, the inner wall portion has a first plate portion along a width direction intersecting with an overlapping direction of the inner wall portion and the outer wall portion and the front-rear direction, the outer wall portion has a return portion that covers one end side of the first plate portion in the width direction, The lance is an inner engaging surface that can be engaged with the plate thickness surface of the first plate portion; an outer engaging surface that can be engaged with the plate thickness surface of the return portion; A connector having a tip protrusion arranged alongside the outer engaging surface at the other end side of the outer engaging surface in the width direction, protruding forward from the outer engaging surface and facing the other end side of the first plate portion in the width direction from the outside.

2. The lance includes a lance body connected to an inner wall of the cavity and extending in the front-rear direction; a locking projection projecting from the lance body toward the inside of the cavity, The inner locking surface is disposed on a front surface of the locking protrusion, The connector according to claim 1 , wherein the outer engaging surface and the tip projection are arranged side by side in the width direction on a front surface of the lance body.

3. The connector according to claim 2 , wherein the positions of the center portions in the width direction of the box portion and the locking projection are aligned inside the cavity.

4. the box portion has a second plate portion at a position opposite to the first plate portion, The connector according to claim 1 , wherein the second plate portion has an excessive deflection restricting portion bent at a rear end portion and facing the lance side.

Images