Female terminal and terminal unit

Abstract

The invention provides a female terminal and a terminal unit. A central axis of a cylindrical connecting part can be easily aligned with a central axis of a columnar connecting part. The female terminal (31) is provided with: a cylindrical section (41) provided on the peripheral wall (40); a cylindrical section (51) provided on the peripheral wall (50) so as to face the cylindrical section (41); and a cylindrical connection section (60) comprising the cylindrical section (41) and the cylindrical section (51). The cylindrical connecting part is a part which is inserted into the cylindrical connecting part (201) along the third direction (Z1) and is electrically connected with the cylindrical connecting part (201). Both the cylindrical section (41) and the cylindrical section (51) have an introduction section (61) that is provided at a first end in the axial direction of the cylindrical connection section (60) and introduces the columnar connection section (201) into the cylindrical connection section. The inner peripheral surface of the introduction portion is formed as an inclined surface (63) inclined toward the outside in the radial direction of the cylindrical connection portion as the first opening end of the cylindrical connection portion toward the first end portion.

Description

Technical Field

[0001] The present disclosure relates to a female terminal and a terminal unit. Background Art

[0002] Conventionally, as a connector mounted on a vehicle, a connector having a female terminal and a housing for holding the female terminal is known. The columnar connecting portion of the male terminal is inserted into the cylindrical connecting portion of the female terminal, and the columnar connecting portion is electrically connected to the female terminal. Such a female terminal utilizes the elastic force of a biasing member such as a coil spring to stably ensure contact pressure on the columnar connecting portion of the male terminal (for example, see Patent Document 1). Prior art literature Patent Literature

[0003] Patent Document 1: Japanese Patent Application Publication No. 2021-28903 Summary of the invention Problems to be solved by the invention

[0004] However, in the above connector, it is desired to easily align the central axis of the cylindrical connection portion with the central axis of the cylindrical connection portion when the cylindrical connection portion is inserted into the cylindrical connection portion. An object of the present disclosure is to provide a female terminal and a terminal unit that can easily align the central axis of a cylindrical connecting portion with the central axis of a columnar connecting portion. Solutions to Solve Problems

[0005] The female terminal of the present disclosure comprises: a first peripheral wall extending along a first direction; a second peripheral wall extending along the first direction and facing the first peripheral wall in a second direction orthogonal to the first direction; a first cylindrical portion provided on the first peripheral wall; a second cylindrical portion provided on the second peripheral wall in a manner facing the first cylindrical portion; and a cylindrical connecting portion, which is composed of the first cylindrical portion and the second cylindrical portion, wherein the axial direction of the cylindrical connecting portion extends along a third direction intersecting both the first direction and the second direction, and the cylindrical connecting portion is provided for the male terminal The columnar connecting portion of the sub is inserted into the interior thereof along the third direction and is electrically connected to the male terminal, the first cylindrical portion and the second cylindrical portion both have a first introduction portion, the first introduction portion is arranged at the first axial end portions of the first cylindrical portion and the second cylindrical portion, and the columnar connecting portion is introduced into the interior of the cylindrical connecting portion, the inner circumferential surface of the first introduction portion is formed as a first inclined surface, and the first inclined surface is inclined toward the radial outer side of the cylindrical connecting portion as it moves toward the first opening end of the cylindrical connecting portion located at the first end portion. Effects of the Invention

[0006] According to the female terminal and the terminal unit of the present disclosure, it is possible to achieve an effect of being able to easily align the central axis of the cylindrical connecting portion with the central axis of the columnar connecting portion. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a perspective view showing a wire harness according to an embodiment. Figure 2 It is an exploded perspective view showing a wire harness according to an embodiment. Figure 3 It is an exploded perspective view showing a wire harness according to an embodiment. Figure 4 It is a perspective view showing a terminal unit according to one embodiment. Figure 5 It is a top view showing a terminal unit according to one embodiment. Figure 6 It is a top view showing a terminal unit according to one embodiment. Figure 7 is a cross-sectional view showing a terminal unit according to an embodiment ( Figure 5 and Figure 6 7-7 line section view in the figure). Figure 8 is a cross-sectional view showing a terminal unit according to an embodiment ( Figure 5 and Figure 6 8-8 line section view). Fig. 9 It is a top view showing a terminal unit according to one embodiment. Fig.10 It is a cross-sectional perspective view showing a female terminal according to an embodiment. Fig.11 It is a cross-sectional view showing a terminal unit according to one embodiment. Fig.12 is a cross-sectional view showing a female terminal according to an embodiment ( Figure 5 and Figure 6 12-12 line section view). Fig.13 is a cross-sectional view showing a female terminal according to an embodiment ( Fig.12 13-13 line cross-sectional view). Fig.14 It is a cross-sectional perspective view showing a female terminal according to an embodiment. DETAILED DESCRIPTION

[0008] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be described below. [1] The female terminal disclosed in the present invention comprises: a first peripheral wall extending along a first direction; a second peripheral wall extending along the first direction and facing the first peripheral wall in a second direction orthogonal to the first direction; a first cylindrical portion provided on the first peripheral wall; a second cylindrical portion provided on the second peripheral wall in a manner facing the first cylindrical portion; and a cylindrical connecting portion consisting of the first cylindrical portion and the second cylindrical portion, wherein the axial direction of the cylindrical connecting portion extends along a third direction intersecting both the first direction and the second direction, and the cylindrical connecting portion is provided The columnar connecting portion of the male terminal is inserted into the interior thereof along the third direction and is electrically connected to the male terminal, the first cylindrical portion and the second cylindrical portion both having a first introduction portion, the first introduction portion being arranged at the first axial ends of the first cylindrical portion and the second cylindrical portion, and introducing the columnar connecting portion into the interior of the cylindrical connecting portion, the inner peripheral surface of the first introduction portion being formed as a first inclined surface, and the first inclined surface being inclined toward the radially outer side of the cylindrical connecting portion as it approaches the first opening end of the cylindrical connecting portion located at the first end.

[0009] According to this configuration, the inner peripheral surface of the first introduction portion provided at the first axial end of the tubular connection portion is formed as a first inclined surface, and the first inclined surface is inclined radially outward as it approaches the first opening end of the first end. Therefore, when the columnar connection portion of the male terminal is inserted into the tubular connection portion, the terminal end of the columnar connection portion is guided to the inside of the tubular connection portion along the first inclined surface of the first introduction portion. Thus, even when the center axis of the columnar connection portion is offset relative to the center axis of the tubular connection portion, the center axis of the columnar connection portion can be aligned with the center axis of the tubular connection portion by moving the terminal end of the columnar connection portion along the first inclined surface. As a result, by providing the first introduction portion, the center axis of the tubular connection portion can be easily aligned with the center axis of the columnar connection portion when the columnar connection portion is inserted into the tubular connection portion.

[0010] [2] Preferably, in the above [1], the first introduction portion is formed to protrude outward from the outer circumference of the portion of the tubular connecting portion other than the first introduction portion, and the thickness of the first introduction portion is equal to the thickness of the portion of the tubular connecting portion other than the first introduction portion.

[0011] According to the above configuration, the first lead-in portion is formed to have the same thickness as the other parts of the tubular connecting portion. Therefore, compared with the case where the first inclined surface is formed by thinning the first lead-in portion toward the first opening end, the conductor cross-sectional area of ​​the tubular connecting portion can be increased. As a result, the heat capacity of the female terminal can be increased, and the conductor resistance of the female terminal can be reduced. As a result, the temperature rise of the female terminal when power is applied can be appropriately suppressed.

[0012] [3] Preferably, in the above [1] or [2], the first cylindrical portion and the second cylindrical portion both have a second introduction portion, the second introduction portion is arranged at the second axial end portions of the first cylindrical portion and the second cylindrical portion, and the columnar connecting portion is introduced into the interior of the cylindrical connecting portion, and the inner peripheral surface of the second introduction portion is formed as a second inclined surface, and the second inclined surface is inclined toward the radial outer side of the cylindrical connecting portion as it moves toward the second opening end of the cylindrical connecting portion located at the second end portion.

[0013] According to the above configuration, the first and second introduction parts are provided at the two axial ends of the cylindrical connection part, that is, the first and second ends, respectively. Therefore, no matter which end of the two ends of the cylindrical connection part the insertion port for inserting the columnar connection part into the cylindrical connection part is provided, the columnar connection part can be inserted into the inside of the cylindrical connection part while aligning the central axis of the cylindrical connection part with the central axis of the columnar connection part. Therefore, the restriction of the insertion direction of the columnar connection part relative to the axial direction of the cylindrical connection part can be eliminated.

[0014] [4] In any one of the above [1] to [3], the first cylindrical portion has a plurality of split cylindrical portions split along the axial direction, and each of the plurality of split cylindrical portions has a first inner surface opposite to the second cylindrical portion, and a protrusion protruding from the first inner surface toward the radial inner side of the cylindrical connecting portion with an arc-shaped cross-section.

[0015] According to the above-mentioned structure, when the columnar connection part of the male terminal is pressed into the cylindrical connection part, the protrusions provided on the first inner surface of each of the plurality of divided cylindrical parts contact the outer peripheral surface of the columnar connection part. Therefore, in the cylindrical connection part, the plurality of protrusions contact the outer peripheral surface of the columnar connection part at a plurality of locations separated in the axial direction. Thus, even in the case where, for example, the swing is transmitted to the male terminal, the male terminal can be properly prevented from being displaced due to the swing by the contact between the plurality of protrusions and the columnar connection part. That is, compared with the case where only one protrusion is provided on the first inner surface of the first cylindrical part, the displacement of the columnar connection part inside the cylindrical connection part can be suppressed by the contact pressure formed by the plurality of protrusions.

[0016] [5] Preferably, in the above [4], the plurality of divided cylindrical portions are two divided cylindrical portions, the first cylindrical portion has a slit that divides the two divided cylindrical portions, and the slit is provided at a central position of the cylindrical connecting portion in the axial direction.

[0017] According to the above configuration, the slit separating the two divided cylindrical parts is set at the axial center of the cylindrical connection part. In this case, when the columnar connection part of the male terminal inserted into the cylindrical connection part is displaced, the columnar connection part rotates with the axial center of the cylindrical connection part as the rotation center. In the case where the contact portion between the protrusion and the columnar connection part is set at such a rotation center, the contact pressure generated by the protrusion cannot be used as a force to suppress the displacement of the columnar connection part. In contrast, in the above configuration, the protrusion is set at a position different from the slit set at the axial center of the cylindrical connection part. Therefore, the protrusion can be made to contact the columnar connection part at a position different from the rotation center of the displacement of the columnar connection part. As a result, the contact pressure generated by the protrusion can be appropriately used as a force to suppress the displacement of the columnar connection part. As a result, the displacement of the columnar connection part inside the cylindrical connection part can be appropriately suppressed by the contact pressure generated by multiple protrusions.

[0018] [6] Preferably, in the above [5], the two split cylindrical portions each have a guide portion, the guide portion is provided at a third end portion directly connected to the slit, the inner peripheral surface of the guide portion is formed as a third inclined surface, the third inclined surface is inclined toward the radially outer side of the cylindrical connecting portion as it approaches the slit, and the guide portion is formed so that the thickness of the split cylindrical portion becomes thinner as it approaches the slit.

[0019] According to the above configuration, the inner peripheral surface of the guide portion provided at the third end of the split cylindrical portion is formed as a third inclined surface that is inclined radially outward as it approaches the slit. Therefore, when the terminal end of the columnar connecting portion passes through the slit and is inserted into the split cylindrical portion, the terminal end of the columnar connecting portion is guided to the inside of the split cylindrical portion along the third inclined surface of the guide portion. Thus, the columnar connecting portion can be smoothly guided to the inside of the split cylindrical portion.

[0020] [7] Preferably, in the above [6], the first inclined surface extends along a first inclined direction inclined at a first inclination angle relative to the center axis of the tubular connecting portion, the third inclined surface extends along a second inclination direction inclined at a second inclination angle relative to the center axis, and the size of the first inclined surface extending along the first inclination direction is larger than the size of the third inclined surface extending along the second inclination direction.

[0021] According to the above configuration, the first inclined surface can be formed longer along the first inclined direction. Thus, the distance from the first opening end to the contact portion of the cylindrical connection portion can be extended. Therefore, when the columnar connection portion is inserted into the cylindrical connection portion, the distance that the columnar connection portion is moved while the central axis of the cylindrical connection portion is aligned with the central axis of the columnar connection portion can be extended. Therefore, the alignment accuracy of the central axis of the cylindrical connection portion and the central axis of the columnar connection portion can be improved.

[0022] [8] Preferably, in the above [7], the first inclination angle is smaller than the second inclination angle. According to the above configuration, the first inclined surface is formed as an inclined surface that is more gently inclined than the third inclined surface. Therefore, when the columnar connecting part is inserted into the cylindrical connecting part, the pressure generated at the terminal end of the columnar connecting part and the first inclined surface can be reduced. As a result, the amount of wear of the cylindrical connecting part when the columnar connecting part is inserted can be reduced.

[0023] [9] Preferably, in any one of the above items [4] to [8], the second cylindrical portion has a second inner surface opposite to the first inner surface, and the female terminal also has a winding pressing portion that limits the spacing distance between the first inner surface and the second inner surface, and the winding pressing portion is formed as a whole with the second peripheral wall. The winding pressing portion extends from the second peripheral wall, wraps the end edge of the first peripheral wall inside and folds back, and contacts the outer surface of the first peripheral wall.

[0024] According to the above-mentioned structure, when the columnar connecting part of the male terminal is pressed into the cylindrical connecting part, the spacing distance between the first inner surface constituting the cylindrical connecting part and the second inner surface constituting the cylindrical connecting part can be increased by limiting the winding and pressing part. By limiting the winding and pressing part, the protrusion can be properly contacted with the outer peripheral surface of the columnar connecting part. As a result, the contact state between the cylindrical connecting part and the columnar connecting part can be stably maintained. Furthermore, the winding and pressing part is formed as a whole with the second peripheral wall. Therefore, compared with the case of using a single component such as a coil spring, the contact state between the cylindrical connecting part and the columnar connecting part can be maintained using a simple structure. That is, compared with the case of using a single component such as a coil spring, the structure of the female terminal can be simplified.

[0025]

[10] The terminal unit of the present disclosure comprises: the female terminal described in any one of [1] to [9] above; and a male terminal having the columnar connecting portion inserted into the cylindrical connecting portion. According to the above structure, the same effect as the female terminal of the above-mentioned [1] can be obtained.

[0026]

[11] Preferably, in the above-mentioned

[10] , the columnar connection portion has a terminal portion formed in a tapered shape, and an outer peripheral surface of the terminal portion extends parallel to the first inclined surface. According to the above configuration, when the columnar connection part is inserted into the cylindrical connection part, the outer peripheral surface of the terminal end of the columnar connection part and the first inclined surface extending parallel to the outer peripheral surface contact each other. Therefore, compared with the case where the inclined surface and the vertical surface contact each other, the contact area between the outer peripheral surface of the terminal end of the columnar connection part and the first inclined surface can be increased. As a result, the surface pressure applied to the first inclined surface from the terminal end of the columnar connection part can be appropriately reduced. Therefore, the amount of wear of the columnar connection part and the cylindrical connection part when the columnar connection part is inserted can be appropriately reduced.

[0027] [Detailed description of embodiments of the present disclosure] Below, specific examples of the female terminal and terminal unit disclosed in the present invention are described in conjunction with the accompanying drawings. In each of the accompanying drawings, for the sake of convenience, there is an exaggeration or simplification of a part of the structure. In addition, the size ratios of each part may be different in each of the accompanying drawings. "Parallel" and "orthogonal" in this specification not only refer to parallel and orthogonal in a strict sense, but also include the situation of being roughly parallel and orthogonal within the scope of being able to achieve the effect of the present embodiment. "Equal" in this specification not only refers to completely equal, but also includes the situation that there are certain differences between the comparison objects due to the influence of dimensional tolerance, etc. "Cylindrical" used in this specification includes not only a structure in which the peripheral wall is continuously formed along the entire circumference, but also a cylindrical structure composed of multiple parts, or a C-shaped or U-shaped structure with a notch in the circumference. In addition, the shape of "cylindrical" includes a circle, an ellipse, and a polygon with a sharp corner or a rounded corner, but is not limited to this. "Opposite" in this specification refers to the position where two surfaces or components are located in front of each other, including both the situation where they are completely in front of each other and the situation where they are partially in front of each other. In addition, "opposed" in this specification includes both the case where there are other components between the two parts and the case where there is no intervening object between the two parts. In addition, the terms "first", "second", "third", etc. in this specification are only used to distinguish objects and do not indicate the priority of the objects. The present invention is not limited to these examples, but is defined by the claims, and is intended to include all changes within the meaning and scope of the equivalents to the claims.

[0028] (Overall Structure of Wiring Harness W1) like Figure 1 As shown, the wiring harness W1 includes one or more (two in this embodiment) wires 20 and a connector C1 installed at the end of the wire 20. The wiring harness W1 electrically connects, for example, electrical devices for a vehicle to each other. Examples of electrical devices for a vehicle include an inverter and a motor for driving wheels. Although not shown in detail, the connector C1 is electrically connected to a counterpart connector provided on the electrical device. The counterpart connector includes, for example, one or more (two in this embodiment) male terminals 200 (see Figure 4 ), and a mating housing that holds two male terminals 200. In addition, the directions in the drawings do not necessarily indicate the postures of the connector C1 and the wire harness W1 when in use.

[0029] (Overall structure of connector C1) like Figure 2As shown in the figure, the connector C1 includes a housing 30 and a plurality of female terminals 31 connected to the ends of the plurality of electric wires 20, respectively. The housing 30 holds the plurality of electric wires 20 and the plurality of female terminals 31. The housing 30 has a housing body 110 that accommodates the plurality of female terminals 31, and a stopper 120 mounted on the housing body 110. In addition, the X-axis, Y-axis, and Z-axis that are orthogonal to each other are shown in each of the drawings. The first direction X1, which is one direction along the X-axis direction, and the first opposite direction X2, which is the opposite direction of the first direction X1, are shown in each of the drawings. The second direction Y1, which is one direction along the Y-axis direction, and the second opposite direction Y2, which is the opposite direction of the second direction Y1, are shown in each of the drawings. The third direction Z1, which is one direction along the Z-axis direction, and the third opposite direction Z2, which is the opposite direction of the third direction Z1, are shown in each of the drawings. Unless otherwise specified, the above directions refer to directions in a state where the connector C1 is assembled to the ends of the electric wires 20.

[0030] The female terminal 31 and the electric wire 20 are inserted into the housing body 110 along the first direction X1. The stopper 120 is installed in the housing body 110 along the third direction Z1. For example, the counterpart connector is connected to the connector C1 along the third direction Z1. For example, the male terminal 200 (see Figure 4 ) is inserted into the interior of the shell body 110 along the third direction Z1.

[0031] (Configuration of the Electric Wire 20) Each electric wire 20 includes a core wire 21 having conductivity and an insulating coating 22 surrounding the outer periphery of the core wire 21 and having insulation properties. For example, a stranded wire formed by twisting a plurality of metal spiral wires or a single core wire composed of a single conductor can be used as the core wire 21. The insulating coating 22 covers the outer peripheral surface of the core wire 21, for example, all over the circumference.

[0032] The end portion of the core wire 21 in the first direction X1 is exposed from the insulating coating 22. The female terminal 31 is connected to the end portion of the core wire 21 in the first direction X1 exposed from the insulating coating 22. like Figure 3 As shown, the end of the electric wire 20 in the first direction X1 is housed inside the housing body 110. The electric wire 20 is led out in the first opposite direction X2 from the end of the housing body 110 in the first opposite direction X2.

[0033] (Configuration of female terminal 31) like Figure 2 As shown, the two female terminals 31 are electrically connected to the two electric wires 20, respectively. The two female terminals 31 are arranged side by side, for example, along the Y-axis direction. The two female terminals 31 have, for example, the same structure. Here, the description will focus on the female terminal 31 arranged on the second direction Y1 side of the two female terminals 31.

[0034] Each female terminal 31 includes a wire connection portion 32 connected to the end of the wire 20, and a terminal connection portion 33 extending from the end of the wire connection portion 32 in the first direction X1 to the first direction X1. Each female terminal 31 is, for example, a single component in which the wire connection portion 32 and the terminal connection portion 33 are continuously formed as one body. Each female terminal 31 of the present embodiment is formed by bending a sheet of metal plate. Each female terminal 31 is made of, for example, metal. As the material of each female terminal 31, a copper-based or aluminum-based metal material can be used.

[0035] The wire connection portion 32 is connected to the end of the core wire 21 exposed from the insulating coating 22. The wire connection portion 32 is formed in a flat plate shape, for example. The wire connection portion 32 extends in a strip shape along the X-axis direction, for example. The wire connection portion 32 is connected to the core wire 21 by crimping or ultrasonic welding, for example. Thus, the wire connection portion 32 is electrically and mechanically connected to the core wire 21.

[0036] like Figure 4 As shown, the terminal connection part 33 is a female terminal part connected to the male terminal 200 of the other connector. Here, the male terminal 200 has a columnar columnar connection part 201. The columnar connection part 201 of this embodiment is formed in a cylindrical shape. In addition, the female terminal 31 and the male terminal 200 together constitute the terminal unit U1.

[0037] The terminal connection portion 33 includes: a peripheral wall 40 having a cylindrical portion 41; a peripheral wall 50 having a cylindrical portion 51 opposite to the cylindrical portion 41; and a cylindrical connection portion 60. The terminal connection portion 33 includes, for example, a connecting portion 70, a protruding portion 80, a winding pressing portion 90, and a protective portion 100. The peripheral wall 40 and the peripheral wall 50 are opposite to each other in the Y-axis direction.

[0038] (Configuration of Peripheral Wall 40 and Peripheral Wall 50) like Figure 4 and Figure 5 As shown, the end of the peripheral wall 40 in the first opposite direction X2 is connected to the end of the wire connecting portion 32 in the first direction X1. The peripheral wall 40 is formed in a strip shape extending along the first direction X1. The peripheral wall 40, for example, extends from the end of the wire connecting portion 32 in the first direction X1 to the first direction X1. The peripheral wall 40, for example, is formed in a flat plate shape. Figure 4 As shown, the peripheral wall 40 has an inner surface facing the peripheral wall 50 and an outer surface provided on the opposite side to the inner surface in the Y-axis direction.

[0039] like Figure 4 and Figure 6 As shown in FIG. 1 , the peripheral wall 50 is formed in a strip shape extending along the first direction X1. The peripheral wall 50 is formed in a flat plate shape, for example. Figure 4As shown, the peripheral wall 50 has an inner surface opposite to the inner surface of the peripheral wall 40, and an outer surface provided on the opposite side of the inner surface in the Y-axis direction. The inner surface of the peripheral wall 50 is provided separately from the inner surface of the peripheral wall 40 in the Y-axis direction. The peripheral wall 50 extends, for example, in parallel with the peripheral wall 40.

[0040] The cylindrical portion 41 is disposed at the middle position of the peripheral wall 40 in the X-axis direction. The cylindrical portion 41 is disposed between the winding pressing portion 90 and the protection portion 100 in the X-axis direction. The cylindrical portion 41 is formed in a half-cut cylindrical shape as a whole. Figure 5 As shown, the cylindrical portion 41 extends along the Z-axis direction over the entire length of the peripheral wall 40 in the Z-axis direction.

[0041] like Figure 4 As shown, the cylindrical portion 51 is arranged at the middle position of the peripheral wall 50 in the X-axis direction. The cylindrical portion 51 is arranged between the winding pressing portion 90 and the protection portion 100 in the X-axis direction. The cylindrical portion 51 is formed as a half-cut cylinder as a whole. The cylindrical portion 51 extends along the Z-axis direction over the entire length of the peripheral wall 50 in the Z-axis direction.

[0042] The cylindrical portion 41 and the cylindrical portion 51 are bent in a direction away from each other. The cylindrical portion 41 and the cylindrical portion 51 constitute the cylindrical connection portion 60. The cylindrical connection portion 60 is a portion into which the columnar connection portion 201 of the male terminal 200 is inserted along the third direction Z1 and to which the columnar connection portion 201 is electrically connected. The axial direction of the cylindrical connection portion 60 extends in a direction intersecting the direction in which the peripheral walls 40 and 50 extend (here, the X-axis direction), in this embodiment, the Z-axis direction. The cylindrical connection portion 60 is open at both ends in the Z-axis direction.

[0043] like Figure 7 As shown, the cylindrical connection part 60 is, for example, formed in a cylindrical shape as a whole. The cylindrical connection part 60 has, for example, a maximum inner diameter smaller than the maximum outer diameter of the columnar connection part 201. That is, the cylindrical connection part 60 is configured so that the columnar connection part 201 is pressed into the inside of the cylindrical connection part 60.

[0044] The cylindrical portion 41 has an inner surface 42 facing the second direction Y1, and an outer surface provided on the opposite side of the inner surface 42. The outer surface of the cylindrical portion 41 is formed as a curved surface, that is, the cross-sectional shape obtained by cutting the cylindrical portion 41 along a plane parallel to the X-axis direction is a curved surface bent into an arc shape. The outer surface of the cylindrical portion 41 protrudes in an arc-shaped cross section toward the radial outer side of the cylindrical connecting portion 60. Similarly, the inner surface 42 of the cylindrical portion 41 is formed to be recessed in an arc-shaped cross section toward the radial outer side of the cylindrical connecting portion 60.

[0045] A plurality of (two in this embodiment) linear contact portions 43 are provided on the inner surface 42 of the cylindrical portion 41, and the linear contact portions 43 protrude from the inner surface 42 toward the radial inner side of the cylindrical connecting portion 60. The two linear contact portions 43 are provided at positions separated from each other in the circumferential direction of the cylindrical connecting portion 60. For example, the two linear contact portions 43 are partially opposed to each other in the X-axis direction. Figure 5 As shown, each linear contact portion 43 extends, for example, along the axial direction (here, the Z-axis direction) of the cylindrical connecting portion 60 .

[0046] like Figure 7 As shown in FIG. 1 , the curvature of the inner surface 42 having two linear contact portions 43 is set to be smaller than the curvature of the outer peripheral surface of the columnar connection portion 201 of the male terminal 200. As a result, the two linear contact portions 43 can appropriately contact the outer peripheral surface of the columnar connection portion 201. At this time, each linear contact portion 43 contacts the outer peripheral surface of the columnar connection portion 201 in a linear shape along the axial direction of the cylindrical connection portion 60. That is, each linear contact portion 43 forms a linear contact with the outer peripheral surface of the columnar connection portion 201.

[0047] like Figure 6 As shown, the cylindrical portion 51 has a plurality of (two in the present embodiment) split cylindrical portions 52 split along the axial direction of the cylindrical connecting portion 60, and a slit 53 that separates the two split cylindrical portions 52. The two split cylindrical portions 52 are disposed separately from each other in the axial direction of the cylindrical connecting portion 60 with the slit 53 in between. The two split cylindrical portions 52 have, for example, the same structure. The two split cylindrical portions 52 are, for example, formed to be plane-symmetrical with respect to an imaginary plane that includes the center of the slit 53 in the Z-axis direction and extends along both the first direction X1 and the first opposite direction X2.

[0048] like Figure 8 As shown, each divided cylindrical portion 52 has an inner surface 54 facing the second opposite direction Y2 and an outer surface provided on the opposite side of the inner surface 54. Figure 7 As shown in the figure, the outer surface of each divided cylindrical portion 52 is formed as a curved surface, that is, a curved surface whose cross-sectional shape obtained by cutting the divided cylindrical portion 52 along a plane parallel to the X-axis direction is an arc-shaped curved surface. The outer surface of the divided cylindrical portion 52 protrudes in a circular arc-shaped cross-section toward the radial outer side of the cylindrical connecting portion 60. Similarly, the inner surface 54 of the divided cylindrical portion 52 is formed to be recessed in a circular arc-shaped cross-section toward the radial outer side of the cylindrical connecting portion 60.

[0049] like Figure 8 As shown, a recessed portion 55 is provided on the outer surface of each divided cylindrical portion 52, and is recessed from the outer surface toward the radial inner side of the cylindrical connecting portion 60. Figure 6As shown in FIG. 1 , the planar shape of the recessed portion 55 as viewed from the Y-axis direction is formed in, for example, a rectangular shape. The recessed portion 55 is formed over, for example, the entire length of the divided cylindrical portion 52 in the Z-axis direction.

[0050] like Figure 8 As shown, a protrusion 56 protruding from the inner surface 54 toward the radial inner side of the cylindrical connecting portion 60 is provided on the inner surface 54 of each divided cylindrical portion 52. The protrusion 56 is provided, for example, on the inner surface 54 of the divided cylindrical portion 52 where the recessed portion 55 is formed. The protrusion 56 can be formed, for example, by embossing. The protrusion 56 is formed into an embossed shape by pressurizing the outer surface of the divided cylindrical portion 52 using a mold.

[0051] The protrusion 56 is formed, for example, in a shape such that a cross-sectional shape obtained by cutting the protrusion 56 along a plane parallel to the axial direction (here, the Z-axis direction) of the cylindrical connection portion 60 is an arc-shaped protrusion toward the radial inner side of the cylindrical connection portion 60. The protrusion 56 protrudes from the inner surface 54 toward the radial inner side of the cylindrical connection portion 60 in an arc-shaped cross-sectional shape. The protrusion 56 extends along the circumferential direction of the cylindrical connection portion 60. The protrusion 56 extends along the axial direction of the cylindrical connection portion 60. The protruding tip 56A of the protrusion 56 is in point contact with the outer peripheral surface of the columnar connection portion 201 of the male terminal 200, for example.

[0052] like Fig. 9 As shown, each protruding end 56A is provided at the axial center of the divided cylindrical portion 52. Each protruding end 56A is provided at a position separated by a first distance L1 from the center A1 of the cylindrical connecting portion 60 in the axial direction of the cylindrical connecting portion 60. Each protruding end 56A is provided at the center of the divided cylindrical portion 52 in the X-axis direction.

[0053] The slit 53 is formed so as to penetrate the cylindrical portion 51 along the Y-axis direction. The slit 53 is provided at a central position of the cylindrical connecting portion 60 in the axial direction of the cylindrical connecting portion 60 . like Fig.10 As shown in the figure, the slit 53 extends along the circumferential direction of the cylindrical portion 51 over the entire circumferential length of the cylindrical portion 51. The slit 53 extends, for example, from the end surface of the peripheral wall 50 in the first direction X1 along the first opposite direction X2 and extends to a position closer to the first opposite direction X2 than the divided cylindrical portion 52. The slit 53 opens in the first direction X1. That is, the slit 53 is formed to be cut from the end surface of the peripheral wall 50 in the first direction X1 to the first opposite direction X2.

[0054] The end of the peripheral wall 50 in the first direction X1 is formed to be divided into two by the slit 53. That is, the end of the peripheral wall 50 in the first direction X1 has two divided portions 57 formed in a bifurcated shape. Each divided portion 57 has a divided cylindrical portion 52. Each divided portion 57 is formed, for example, to be supported in a cantilevered manner at the end of the peripheral wall 50 in the first opposite direction X2. The two divided portions 57 have, for example, the same structure. The two divided portions 57 are plane-symmetrical with respect to an imaginary plane that includes the center of the slit 53 in the Z-axis direction and extends along the X-axis direction.

[0055] like Figure 8 As shown, both ends of the cylindrical connection part 60 in the axial direction have introduction parts 61 and 62 for introducing the columnar connection part 201 of the male terminal 200 into the inside of the cylindrical connection part 60. The introduction part 61 is provided at the first end of the cylindrical connection part 60 in the axial direction, that is, the end of the cylindrical connection part 60 in the third opposite direction Z2. The introduction part 62 is provided at the second end of the cylindrical connection part 60 in the axial direction, that is, the end of the cylindrical connection part 60 in the third direction Z1. The introduction parts 61 and 62 are each formed throughout the entire circumference of the cylindrical connection part 60. The introduction parts 61 and 62 are each formed throughout the entire circumference of the cylindrical part 41, and are formed throughout the entire circumference of the cylindrical part 51. That is, both the cylindrical part 41 and the cylindrical part 51 have the introduction parts 61 and 62. Since the introduction part 62 has the same shape as the introduction part 61, the detailed description of the introduction part 62 is omitted here.

[0056] The introduction portion 61 is formed such that the opening area of ​​the cylindrical connection portion 60 increases as it approaches the first opening end of the first end portion of the cylindrical connection portion 60, that is, the opening end of the cylindrical connection portion 60 in the third opposite direction Z2. The introduction portion 61 is formed to protrude outward from the outer circumference of the portion of the cylindrical connection portion 60 other than the introduction portions 61 and 62. The thickness of the introduction portion 61 is equal to the thickness of the portion of the cylindrical connection portion 60 other than the introduction portions 61 and 62. In other words, the radial thickness (wall thickness) of the cylindrical connection portion 60 does not change over the entire length of the cylindrical connection portion 60 including the introduction portions 61 and 62.

[0057] like Fig.11As shown in FIG. 1 , the introduction portion 61 is formed such that the inner diameter and the outer diameter of the cylindrical connection portion 60 increase as the cylindrical connection portion 60 moves toward the first opening end of the cylindrical connection portion 60 in the axial direction of the cylindrical connection portion 60. The inner peripheral surface of the introduction portion 61 is formed as an inclined surface 63, and the inclined surface 63 is inclined toward the radial outer side of the cylindrical connection portion 60 as the cylindrical connection portion 60 moves toward the first opening end of the cylindrical connection portion 60 in the axial direction of the cylindrical connection portion 60. The inclined surface 63 is inclined toward a direction away from the columnar connection portion 201 as it moves toward the first opening end of the cylindrical connection portion 60. The inclined surface 63 extends along a first inclined direction S1 inclined at a first inclination angle relative to the central axis CA1 of the cylindrical connection portion 60. Here, the first inclination angle is an acute angle formed by the direction extending from the central axis CA1 and the first inclination direction S1 on the YZ plane. The first inclination angle is preferably in the range of 20° to 45°, and more preferably in the range of 30° to 40°. The outer peripheral surface of the introduction portion 61 is formed to be inclined toward the radial outer side of the cylindrical connection portion 60 as it moves toward the first open end of the cylindrical connection portion 60 in the axial direction of the cylindrical connection portion 60. The outer peripheral surface of the introduction portion 61 extends, for example, in parallel with the inclined surface 63. That is, the outer peripheral surface of the introduction portion 61 extends inclined at the same first inclination angle as the inclined surface 63. In other words, the outer peripheral surface of the introduction portion 61 extends along the first inclination direction S1.

[0058] The introduction portion 62 is formed so that the opening area of ​​the cylindrical connection portion 60 increases as it approaches the second opening end of the second end of the cylindrical connection portion 60, that is, the opening end of the cylindrical connection portion 60 in the third direction Z1. The inner peripheral surface of the introduction portion 62 is formed as an inclined surface 64, and the inclined surface 64 is inclined toward the radial outer side of the cylindrical connection portion 60 as it approaches the second opening end of the cylindrical connection portion 60 in the axial direction of the cylindrical connection portion 60. The inclined surface 64 extends obliquely with respect to the central axis CA1 of the cylindrical connection portion 60 at the same first inclination angle as the inclined surface 63. The introduction portion 62 is formed so as to protrude outward from the outer peripheral surface of the portion of the cylindrical connection portion 60 other than the introduction portions 61 and 62. The thickness of the introduction portion 62 is equal to the thickness of the portion of the cylindrical connection portion 60 other than the introduction portions 61 and 62.

[0059] Here, the columnar connection part 201 is inserted into the inside of the cylindrical connection part 60 along the third direction Z1. The columnar connection part 201 has a terminal part 202 formed in a shape that gradually becomes thinner toward the terminal end (tapered shape). The terminal part 202 is provided at the insertion terminal end of the columnar connection part 201, that is, the end of the columnar connection part 201 in the third direction Z1. The terminal part 202 becomes thinner as it approaches the terminal surface 203 of the columnar connection part 201, that is, the end surface of the columnar connection part 201 in the third direction Z1. Here, the terminal surface 203 is formed as a flat surface. The outer peripheral surface of the terminal part 202 is formed as an inclined surface 204 that is inclined toward the radial inner side of the columnar connection part 201 as it approaches the terminal surface 203 in the axial direction of the columnar connection part 201. The inclined surface 204 is inclined so as to approach the central axis CA2 of the columnar connection part 201 as it approaches the terminal surface 203. The inclined surface 204 extends, for example, in parallel with the inclined surface 63 of the introduction part 61. That is, the inclined surface 204 extends to be inclined at the same first inclination angle as the inclined surface 63 with respect to the central axis CA2 of the columnar connection portion 201. In other words, the inclined surface 204 extends along the first inclination direction S1.

[0060] Each of the lead-in portions 61 and 62 has the function of guiding the columnar connection portion 201 into the cylindrical connection portion 60 while aligning the central axis CA2 of the columnar connection portion 201 with the central axis CA1 of the cylindrical connection portion 60 when the columnar connection portion 201 of the male terminal 200 is inserted into the cylindrical connection portion 60. Such lead-in portions 61 and 62 are provided at both ends of the cylindrical connection portion 60 in the axial direction.

[0061] Each of the two divided cylindrical portions 52 has a third end portion that is directly connected to the slit 53. The third end portion of each divided cylindrical portion 52 is opposite to the other divided cylindrical portion 52. The third end portion of each divided cylindrical portion 52 has a guide portion 65. The guide portion 65 is formed so that the opening area of ​​the cylindrical connection portion 60 increases as it approaches the slit 53. For example, the guide portion 65 is formed so that the thickness of the divided cylindrical portion 52 decreases as it approaches the slit 53. The guide portion 65 is formed so that only the inner diameter of the cylindrical connection portion 60 increases as it approaches the slit 53 in the axial direction of the cylindrical connection portion 60. The inner peripheral surface of the guide portion 65 is formed as an inclined surface 66, and the inclined surface 66 is inclined toward the radial outer side of the cylindrical connection portion 60 as it approaches the slit 53 in the axial direction of the cylindrical connection portion 60. The inclined surface 66 is inclined toward the direction away from the columnar connection portion 201 as it approaches the slit 53. The inclined surface 66 extends along the second inclined direction S2 inclined at a second inclination angle relative to the central axis CA1 of the cylindrical connecting portion 60. The second inclination angle is an acute angle formed by the direction extending from the central axis CA1 on the YZ plane and the second inclination direction S2. The inclined surface 66 is formed, for example, over the entire circumference of the inner surface 54 of the divided cylindrical portion 52.

[0062] Here, the dimension of the inclined surface 63 along the first inclined direction S1 is larger than the dimension of the inclined surface 66 along the second inclined direction S2 . The first inclination angle of the inclined surface 63 is smaller than the second inclination angle of the inclined surface 66 .

[0063] like Figure 5 As shown, the peripheral wall 40 has, for example, a pair of notches 48. The pair of notches 48 are provided at both ends of the peripheral wall 40 in the Z-axis direction. The pair of notches 48 are provided in a mutually overlapping manner in a plan view observed from the Z-axis direction. The pair of notches 48 are provided adjacent to the connecting portion 70 and the winding pressing portion 90 in the X-axis direction. Each notch 48 penetrates the peripheral wall 40 along the Y-axis direction. Each notch 48 is formed by cutting from the end surface of the peripheral wall 40 in the Z-axis direction toward the inner side of the peripheral wall 40. In the portion where the pair of notches 48 are provided, the dimension of the peripheral wall 40 along the Z-axis direction is smaller than that of other portions.

[0064] like Figure 6 As shown, the peripheral wall 50 has, for example, a pair of notches 58. The pair of notches 58 are provided at both ends of the peripheral wall 50 in the Z-axis direction. The pair of notches 58 are provided so as to overlap each other in a plan view viewed from the Z-axis direction. The pair of notches 58 are provided adjacent to the connecting portion 70 and the winding pressing portion 90 in the X-axis direction. Fig.10 As shown, each notch 58 overlaps with each notch 48 in a plan view observed from the Y-axis direction. Each notch 58 penetrates the peripheral wall 50 along the Y-axis direction. Each notch 58 is formed by cutting from the end surface of the peripheral wall 50 in the Z-axis direction to the inside of the peripheral wall 50. In the portion where the pair of notches 58 are provided, the dimension of the peripheral wall 50 along the Z-axis direction is smaller than that of other portions.

[0065] (Configuration of the Connecting Section 70) The connecting portion 70 connects the peripheral wall 40 and the peripheral wall 50. The connecting portion 70 connects the end portion of the peripheral wall 40 in the third opposite direction Z2 and the end portion of the peripheral wall 50 in the third opposite direction Z2. The connecting portion 70 is formed integrally with the peripheral wall 40 and is formed integrally with the peripheral wall 50. The connecting portion 70 is formed so as to be folded back from the end surface of the peripheral wall 40 in the third opposite direction Z2 toward the end surface of the peripheral wall 50 in the third opposite direction Z2.

[0066] The connection portion 70 is provided, for example, at the end portion in the first opposite direction X2 of the peripheral wall 40. The connection portion 70 extends toward the first direction X1 from the end portion in the first opposite direction X2 of the peripheral wall 40. The connection portion 70 protrudes toward the third opposite direction Z2 from the end surface in the third opposite direction Z2 of the peripheral wall 40, and protrudes toward the third opposite direction Z2 from the end surface in the third opposite direction Z2 of the peripheral wall 50.

[0067] like Fig.12As shown, the connecting portion 70 includes an extension portion 71 extending from the end surface of the peripheral wall 40 in the third opposite direction Z2 to the third opposite direction Z2, and an extension portion 72 extending from the end surface of the peripheral wall 50 in the third opposite direction Z2 to the third opposite direction Z2. The connecting portion 70 includes a return portion 73 connecting the extension portion 71 and the extension portion 72.

[0068] The extension portion 71 is continuous with the peripheral wall 40 and is formed as one piece. The folding portion 73 is continuous with the extension portion 71 and is formed as one piece. The folding portion 73 is formed to fold back from the end of the extension portion 71 toward the peripheral wall 50. The folding portion 73 folds back in a U-shape from the end of the extension portion 71 toward the third direction Z1, for example. The extension portion 72 extends from the folding portion 73 toward the peripheral wall 50 along the third direction Z1. The extension portion 72 is continuously formed as one piece with the folding portion 73 and is continuously formed as one piece with the peripheral wall 50. The connecting portion 70 is composed of the extension portion 71, the folding portion 73 and the extension portion 72, and is formed into a U-shaped folded shape that protrudes in a direction away from the peripheral wall 40 and the peripheral wall 50 (here, the third opposite direction Z2). The connecting portion 70 is folded back in a manner that the peripheral wall 50 and the peripheral wall 40 are arranged opposite to each other. In other words, in the terminal connection portion 33 , the peripheral wall 50 is folded in two by the connecting portion 70 to cover the peripheral wall 40 .

[0069] The connection portion 70 is formed by, for example, bending a sheet of metal plate. Here, since the notches 48 and 58 are provided at positions adjacent to the connection portion 70, it is easy to bend the metal plate when forming the connection portion 70.

[0070] (Configuration of the protruding portion 80) like Fig.13 As shown, the protrusion 80 is provided on the end surface of the peripheral wall 50 in the third direction Z1. The protrusion 80 includes, for example, a protrusion base 81 extending from the end surface of the peripheral wall 50 in the third direction Z1 toward the third direction Z1, and a protrusion 82 extending from a portion of the protrusion end surface of the protrusion base 81 toward the third direction Z1. The protrusion base 81 is continuous with the peripheral wall 50 and formed integrally. The protrusion base 81 extends from the end surface of the peripheral wall 50 in the first opposite direction X2 along the first direction X1. The protrusion 82 is continuous with the protrusion base 81 and formed integrally. The protrusion 82 protrudes from the protrusion end surface of the protrusion base 81, here, the end surface in the third direction Z1, toward the third direction Z1. The protrusion 82 is provided, for example, only at the middle position of the protrusion base 81 in the X-axis direction. The protrusion 82 is formed, for example, such that the width along the X-axis direction decreases as it moves from the protrusion base 81 toward the protrusion end surface of the protrusion 82 in a plan view viewed from the Y-axis direction.

[0071] (Configuration of the Winding Pressing Section 90) like Figure 4As shown, the winding and pressing portion 90 is formed to limit the spacing distance between the inner surface 42 of the cylindrical portion 41 and the inner surface 54 of the cylindrical portion 51. The winding and pressing portion 90 limits the increase in the spacing distance between the inner surface 42 and the inner surface 54. The winding and pressing portion 90 limits the expansion of the connecting portion 70. The winding and pressing portion 90 is formed integrally with the peripheral wall 40. The winding and pressing portion 90 is, for example, provided at the end of the peripheral wall 40 in the third direction Z1. The winding and pressing portion 90 is formed to extend from the peripheral wall 40 and fold back in a manner that wraps the end edge of the peripheral wall 50 inside. The winding and pressing portion 90 is formed to fold back from the end surface of the peripheral wall 40 in the third direction Z1 in a manner that arranges the end surface of the peripheral wall 50 in the third direction Z1 inside. The winding and pressing portion 90 contacts the outer surface of the peripheral wall 50.

[0072] The winding pressing portion 90 is provided, for example, at the end portion of the peripheral wall 40 in the first opposite direction X2. The winding pressing portion 90 extends from the end portion of the peripheral wall 40 in the first opposite direction X2 toward the first direction X1. The winding pressing portion 90 is provided, for example, at a position overlapping with the connecting portion 70 in a plan view viewed from the Z-axis direction. For example, the winding pressing portion 90 is provided on the opposite side of the connecting portion 70 across the peripheral wall 40 in the Z-axis direction.

[0073] like Fig.12 As shown, the winding pressing portion 90 has an extension portion 91 extending from the end surface of the peripheral wall 40 in the third direction Z1 toward the third direction Z1, a folded portion 92 provided at the end of the extension portion 91, and a pressing portion 93 extending from the end of the folded portion 92 toward the peripheral wall 50.

[0074] The extension portion 91 is continuous with the peripheral wall 40 and is formed as a whole. The folding portion 92 is continuous with the extension portion 91 and is formed as a whole. The folding portion 92 is formed to fold back from the end of the extension portion 91 in the third direction Z1 toward the peripheral wall 50. The folding portion 92 folds back in a U-shape from the end of the extension portion 91 toward the third opposite direction Z2, for example. The pressing portion 93 is continuous with the folding portion 92 and is formed as a whole. The pressing portion 93 extends from the folding portion 92 toward the protrusion 80 and the peripheral wall 50 along the third opposite direction Z2. The winding pressing portion 90 is composed of the extension portion 91, the folding portion 92 and the pressing portion 93, forming a U-shaped folding shape that protrudes toward the direction away from the peripheral wall 40 and the peripheral wall 50 (here, the third direction Z1).

[0075] The pressing portion 93 is provided to press the outer surface of the peripheral wall 50 from the outside. The pressing portion 93 is provided, for example, to press the outer surface of the protruding base 81 from the outside. The pressing portion 93 has an opposing surface 94 that faces the outer surface of the peripheral wall 50. The opposing surface 94 extends, for example, parallel to the outer surface of the peripheral wall 50. The opposing surface 94 is in surface contact with the outer surface of the peripheral wall 50, for example.

[0076] like Figure 4As shown, the winding pressing portion 90 has a through hole 95 for the protrusion 82 to fit. The through hole 95 penetrates the winding pressing portion 90 along the thickness direction. The through hole 95 extends, for example, from the middle position of the folded portion 92 to the middle position of the pressing portion 93. The through hole 95 is designed to be large enough to fit the protrusion 82.

[0077] like Fig.14 As shown, the winding pressing portion 90 has an engaging surface 96 that forms a through hole 95 and engages with the protrusion 82. The engaging surface 96 faces, for example, the second direction Y1. The engaging surface 96 faces the inner surface of the protrusion 82 in the Y-axis direction. The engaging surface 96 extends, for example, parallel to the inner surface of the protrusion 82. The engaging surface 96 makes surface contact with the inner surface of the protrusion 82. The outer surface of the protrusion 82 is exposed from the winding pressing portion 90 through the through hole 95, for example.

[0078] In the terminal connection portion 33 of the present embodiment, the outer surface of the peripheral wall 50 is pressed from the outside by the pressing portion 93 of the winding pressing portion 90, and the engaging surface 96 of the winding pressing portion 90 is pressed from the outside by the protrusion 82 of the protruding portion 80. Thus, the increase in the spacing distance between the peripheral wall 40 and the peripheral wall 50 can be stably restricted.

[0079] The winding pressing portion 90 is formed by, for example, bending a sheet of metal plate. Figure 5 and Figure 6 As shown, since the notches 48 and 58 are provided at positions adjacent to the winding pressing portion 90 , it is easy to bend the metal plate when forming the winding pressing portion 90 .

[0080] (Configuration of Protection Unit 100) like Figure 4 As shown, the protection portion 100 is provided, for example, to protect the end portion in the first direction X1 of the terminal connection portion 33. The protection portion 100 is provided at the end portion in the first direction X1 of the peripheral wall 40. The protection portion 100 is formed, for example, as a single piece with the peripheral wall 40. The protection portion 100 is formed by folding back from the end portion in the first direction X1 of the peripheral wall 40 so as to arrange the end portion in the first direction X1 of the peripheral wall 50 inside.

[0081] The protection part 100 includes an extension part 101 extending from the end of the peripheral wall 40 in the first direction X1 to the second direction Y1, and a protection wall 102 extending from the end of the extension part 101 in the second direction Y1 to the peripheral wall 50. The extension part 101 is continuous with the peripheral wall 40 and formed as a whole. The protection wall 102 is continuous with the extension part 101 and formed as a whole. The protection part 100 is composed of the extension part 101 and the protection wall 102, and forms a U-shaped folded shape that is convex toward the direction away from the peripheral wall 50 (here, the first direction X1). The protection wall 102 is provided to be opposite to the end of the peripheral wall 50 in the first direction X1 in the Y-axis direction. The protection wall 102 is provided to be separated from the outer surface of the peripheral wall 50. That is, a gap is provided between the protection wall 102 and the outer surface of the peripheral wall 50. For example, the protection wall 102 is provided to be separated from the outer surface of the peripheral wall 50 in a state where the columnar connection part 201 is inserted into the cylindrical connection part 60.

[0082] (Configuration of Housing Body 110) like Figure 3 As shown, the housing body 110 holds the female terminal 31 so that the electric wire 20 is led out in the first opposite direction X2. The housing body 110 accommodates two female terminals 31. The housing body 110 is formed in a box shape as a whole, for example. The housing body 110 is made of synthetic resin, for example.

[0083] The housing body 110 has an opening 111 that opens in the first opposite direction X2. The electric wire 20 connected to the female terminal 31 is led out to the outside of the housing body 110 through the opening 111. The housing body 110 has, for example, a peripheral wall 112 disposed in the third opposite direction Z2 and a barrel 113 disposed on the outer surface of the peripheral wall 112. The barrel 113 is a fitting barrel for fitting with a counterpart housing of a counterpart connector (not shown). The barrel 113 is disposed at an end of the peripheral wall 112 in the first direction X1. The barrel 113 protrudes from the outer surface of the peripheral wall 112 toward the radial outer side of the housing body 110 (here, the third opposite direction Z2). The barrel 113 is formed, for example, in a square barrel shape.

[0084] The barrel 113 has an insertion hole 114. The insertion hole 114 is formed so as to communicate the inside and the outside of the housing body 110. The insertion hole 114 is open in the third direction Z1 and is open in the third opposite direction Z2. The insertion hole 114 penetrates the barrel 113, for example, along the Z-axis direction, and penetrates the peripheral wall 112 along the Z-axis direction. The insertion hole 114 is formed so as to expose the female terminal 31 housed in the housing body 110. Here, each female terminal 31 housed in the housing body 110 is arranged so that the open end of the cylindrical connecting portion 60 is exposed from the insertion hole 114.

[0085] (Configuration of Stopper 120) The stopper 120 is mounted on the barrel 113 of the housing body 110. The stopper 120 includes a main body 121 and one or more (two in this embodiment) limiting portions 122 that limit the movement of the female terminal 31 in the first opposite direction X2. The stopper 120 is, for example, a single component in which the main body 121 and the limiting portion 122 are continuously formed as one body. The stopper 120 is made of, for example, synthetic resin.

[0086] The main body 121 is formed in a frame shape as a whole, for example. The outer periphery of the main body 121 is formed in a quadrangular shape in a plan view viewed from the Z-axis direction, for example. The main body 121 is formed to cover the end surface of the cylinder 113 in the third opposite direction Z2, for example.

[0087] The main body 121 has one or more (two in this embodiment) insertion holes 123. Each insertion hole 123 penetrates the main body 121 along the Z-axis direction. Each insertion hole 123 is formed to communicate with the insertion hole 114 of the barrel 113. The two insertion holes 123 are formed, for example, to expose the opening ends of the cylindrical connecting parts 60 of the two female terminals 31 respectively housed in the housing body 110.

[0088] like Figure 2 As shown, two limiting parts 122 are respectively provided corresponding to two female terminals 31. The two limiting parts 122 are provided side by side, for example, along the Y-axis direction. Each limiting part 122 is formed, for example, in a cylindrical shape that accommodates a part of the female terminal 31. When the stopper 120 is installed to the housing body 110 along the third direction Z1, the female terminal 31 is inserted into the internal space of the limiting part 122. If the stopper 120 is installed to the housing body 110, the movement of the female terminal 31 in the first opposite direction X2 is limited by the limiting part 122.

[0089] Next, the effects of this embodiment will be described. (1) The female terminal 31 includes: a peripheral wall 40 extending along the first direction X1; and a peripheral wall 50 extending along the first direction X1 and facing the peripheral wall 40 in the second direction Y1 orthogonal to the first direction X1. The female terminal 31 includes: a cylindrical portion 41 provided on the peripheral wall 40, a cylindrical portion 51 provided on the peripheral wall 50 so as to face the cylindrical portion 41, and a cylindrical connecting portion 60 composed of the cylindrical portion 41 and the cylindrical portion 51. The axial direction of the cylindrical connecting portion 60 extends along the third direction Z1 intersecting both the first direction X1 and the second direction Y1. The cylindrical connecting portion 60 is a portion into which the columnar connecting portion 201 of the male terminal 200 is inserted along the third direction Z1 and electrically connected to the columnar connecting portion 201. Both the cylindrical portion 41 and the cylindrical portion 51 have an introduction portion 61, which is provided at the first axial end portion of the cylindrical connection portion 60, here, the end portion of the cylindrical connection portion 60 in the third opposite direction Z2, and introduces the columnar connection portion 201 into the inside of the cylindrical connection portion 60. The inner peripheral surface of the introduction portion 61 is formed as an inclined surface 63, and the inclined surface 63 is inclined toward the radial outer side of the cylindrical connection portion 60 as it moves toward the first opening end of the cylindrical connection portion 60 in the first end portion, here, the opening end of the cylindrical connection portion 60 in the third opposite direction Z2.

[0090] According to this configuration, the inner peripheral surface of the introduction portion 61 provided at the first end portion in the axial direction of the cylindrical connection portion 60 is formed as an inclined surface 63 that is inclined toward the radially outer side as it moves toward the first open end in the first end portion. Therefore, when the columnar connection portion 201 of the male terminal 200 is inserted into the cylindrical connection portion 60, the terminal end 202 of the columnar connection portion 201 is guided to the inside of the cylindrical connection portion 60 along the inclined surface 63 of the introduction portion 61. Thus, even in the case where the central axis CA2 of the columnar connection portion 201 is offset relative to the central axis CA1 of the cylindrical connection portion 60, the terminal end 202 of the columnar connection portion 201 moves along the inclined surface 63, so that the central axis CA2 can be aligned with the central axis CA1. As a result, by providing the introduction portion 61, when the columnar connection portion 201 is inserted into the cylindrical connection portion 60, the central axis CA1 of the cylindrical connection portion 60 can be easily aligned with the central axis CA2 of the columnar connection portion 201.

[0091] (2) The lead-in portion 61 is formed to have the same thickness as the other portions of the cylindrical connection portion 60. Therefore, compared with the case where the lead-in portion 61 is thinned toward the first opening end of the cylindrical connection portion 60 to form the inclined surface 63, the conductor cross-sectional area of ​​the cylindrical connection portion 60 can be increased. As a result, the heat capacity of the female terminal 31 can be increased, and the conductor resistance of the female terminal 31 can be reduced. As a result, the temperature rise of the female terminal 31 when power is applied can be appropriately suppressed.

[0092] (3) The introduction portion 61 and the introduction portion 62 are respectively provided at the two axial ends of the cylindrical connection portion 60, that is, the first end and the second end. Therefore, regardless of which of the two ends of the cylindrical connection portion 60 the insertion port for inserting the columnar connection portion 201 into the cylindrical connection portion 60 is set, the columnar connection portion 201 can be inserted into the inside of the cylindrical connection portion 60 while aligning the central axes CA1 and CA2. In this way, the restriction on the insertion direction of the columnar connection portion 201 with respect to the axial direction of the cylindrical connection portion 60 can be eliminated.

[0093] (4) The cylindrical portion 51 includes a plurality of divided cylindrical portions 52 divided along the axial direction of the cylindrical connecting portion 60. Each of the plurality of divided cylindrical portions 52 includes an inner surface 54 facing the cylindrical portion 41 and a protrusion 56 protruding from the inner surface 54 toward the radially inner side of the cylindrical connecting portion 60 with an arc-shaped cross section.

[0094] According to this configuration, when the columnar connection portion 201 of the male terminal 200 is pressed into the cylindrical connection portion 60, the protrusions 56 provided on the inner surfaces 54 of each of the plurality of divided cylindrical portions 52 are pressed against the outer peripheral surface of the columnar connection portion 201. Therefore, in the cylindrical connection portion 60, the plurality of protrusions 56 are pressed against the outer peripheral surface of the columnar connection portion 201 at a plurality of locations separated in the axial direction. Thus, even if, for example, shaking is transmitted to the male terminal 200, the displacement of the male terminal 200 caused by the shaking can be appropriately prevented by the contact between the plurality of protrusions 56 and the columnar connection portion 201. In other words, compared with the case where only one protrusion 56 is provided on the inner surface 54 of the cylindrical portion 51, the displacement of the columnar connection portion 201 inside the cylindrical connection portion 60 can be suppressed by the contact pressure of the plurality of protrusions 56.

[0095] (5) The slit 53 that separates the two divided cylindrical portions 52 is provided at the central position in the axial direction of the cylindrical connecting portion 60. Fig. 9As shown in the figure, if a shaking is transmitted from a counterpart electric wire (not shown) or the like to the columnar connection part 201 inserted into the cylindrical connection part 60, the columnar connection part 201 may be displaced in the direction of the arrow in the figure inside the cylindrical connection part 60 due to the shaking. Specifically, the columnar connection part 201 may rotate in the direction of the arrow in the figure with the center A1 of the cylindrical connection part 60 in the axial direction as the rotation center due to the above-mentioned shaking. In this case, for example, when the protruding end 56A of the protrusion 56 provided on the cylindrical part 51 is located at the center A1 of the cylindrical connection part 60, the contact portion between the protruding end 56A of the protrusion 56 and the columnar connection part 201 becomes the rotation center of the displacement of the columnar connection part 201. In this case, the contact pressure (contact pressure) between the protrusion 56 and the columnar connection part 201 will not function as a force to suppress the displacement of the columnar connection part 201. In contrast, in the female terminal 31 of the present embodiment, the protrusion 56 is provided at a position different from the slit 53 provided at the center A1. Therefore, the protrusion 56 can be brought into contact with the columnar connection part 201 at a position different from the rotation center of the displacement of the columnar connection part 201. Thus, the contact pressure of the protrusion 56 on the columnar connection part 201 can appropriately function as a force to suppress the displacement of the columnar connection part 201. As a result, the displacement of the columnar connection part 201 inside the cylindrical connection part 60 can be better suppressed by the contact pressure formed by the plurality of protrusions 56. In detail, when the contact pressure of each protrusion 56 on the columnar connection part 201 is F1 and the friction coefficient is μ, the displacement of the columnar connection part 201 can be suppressed by a force of F1×μ×L1. Therefore, the two protrusions 56 can suppress the displacement of the columnar connection part 201 by a force of 2×F1×μ×L1.

[0096] (6) The inner peripheral surface of the guide portion 65 provided at the third end of the split cylindrical portion 52 is formed as an inclined surface 66 that inclines radially outward as it approaches the slit 53. Therefore, when the distal end 202 of the columnar connecting portion 201 is inserted into the split cylindrical portion 52 through the slit 53, the distal end 202 of the columnar connecting portion 201 is guided into the interior of the split cylindrical portion 52 along the inclined surface 66 of the guide portion 65. Thus, the columnar connecting portion 201 can be smoothly guided into the interior of the split cylindrical portion 52.

[0097] (7) The inclined surface 63 extends along the first inclined direction S1 inclined at the first inclination angle with respect to the central axis CA1 of the cylindrical connection part 60. The inclined surface 66 extends along the second inclination direction S2 inclined at the second inclination angle with respect to the central axis CA1. The dimension of the inclined surface 63 along the first inclination direction S1 is larger than the dimension of the inclined surface 66 along the second inclination direction S2. According to this configuration, the inclined surface 63 can be formed long along the first inclination direction S1. Thus, the distance from the first opening end of the cylindrical connection part 60, that is, the opening end of the cylindrical connection part 60 in the third opposite direction Z2, to the contact part of the cylindrical connection part 60, that is, the part of the cylindrical connection part 60 excluding the introduction parts 61 and 62 can be increased. Therefore, when the columnar connection part 201 is inserted into the cylindrical connection part 60, the distance that the columnar connection part 201 is moved while aligning the central axis CA1 of the cylindrical connection part 60 with the central axis CA2 of the columnar connection part 201 can be increased. In this way, the alignment accuracy between the central axis CA1 of the tubular connection portion 60 and the central axis CA2 of the columnar connection portion 201 can be improved.

[0098] (8) The inclined surface 63 is formed to be more gently inclined than the inclined surface 66. Therefore, when the columnar connecting portion 201 is inserted into the cylindrical connecting portion 60, the pressure generated between the distal end portion 202 of the columnar connecting portion 201 and the inclined surface 63 can be reduced. As a result, the amount of wear of the cylindrical connecting portion 60 when the columnar connecting portion 201 is inserted can be reduced.

[0099] (9) When the columnar connection part 201 is pressed into the cylindrical connection part 60, the distance between the inner surface 42 constituting the cylindrical connection part 60 and the inner surface 54 constituting the cylindrical connection part 60 is restricted by the winding pressing part 90 to increase. Due to the restriction of the winding pressing part 90, the protrusion 56 and the linear contact part 43 can more appropriately contact the outer peripheral surface of the columnar connection part 201. As a result, the crimping state of the cylindrical connection part 60 and the columnar connection part 201 can be stably maintained. In addition, the winding pressing part 90 is formed integrally with the peripheral wall 40. Therefore, compared with the case where another component such as a coil spring is used, the crimping state of the cylindrical connection part 60 and the columnar connection part 201 can be maintained by a simple structure. In other words, compared with the case where another component such as a coil spring is used, the structure of the female terminal 31 can be simplified.

[0100] (10) The columnar connection part 201 has a terminal end 202 formed in a tapered shape (a shape that gradually tapers toward the terminal end). The outer peripheral surface of the terminal end 202 extends parallel to the inclined surface 63. In other words, the outer peripheral surface of the terminal end 202 is formed as an inclined surface 204 extending along the first inclined direction S1. According to this configuration, when the columnar connection part 201 is inserted into the cylindrical connection part 60, the inclined surface 204 of the terminal end 202 of the columnar connection part 201 and the inclined surface 63 extending parallel to the inclined surface 204 contact each other. Therefore, compared with the case where the inclined surface contacts the vertical surface, the contact area between the inclined surface 63 and the inclined surface 204 when the columnar connection part 201 is inserted can be increased. As a result, the surface pressure applied from the terminal end 202 of the columnar connection part 201 to the inclined surface 63 can be more appropriately reduced. Therefore, when the columnar connection part 201 is inserted, the amount of wear of the columnar connection part 201 and the cylindrical connection part 60 can be better reduced.

[0101] (Other embodiments) The above-mentioned embodiment can be modified as follows: The above-mentioned embodiment and the following modified examples can be implemented in combination with each other within the scope of no technical contradiction.

[0102] The configuration of the female terminal 31 in the above-described embodiment may be appropriately changed as necessary. The second inclination angle of the inclined surface 66 may be changed to be equal to the first inclination angle of the inclined surface 63 .

[0103] The dimension of the inclined surface 63 along the first inclined direction S1 can be changed to be equal to the dimension of the inclined surface 66 along the second inclined direction S2. The thickness of the introduction portions 61 and 62 may be formed to become thinner toward the axial opening end of the cylindrical connecting portion 60 .

[0104] The guide portion 65 in the split cylindrical portion 52 of the female terminal 31 may be omitted. In the female terminal 31 of the above embodiment, the inner surface 42 of the cylindrical portion 41 is provided with a plurality of linear contact portions 43, and the cylindrical portion 51 has a plurality of divided cylindrical portions 52 and a protrusion 56 provided on the inner surface 54 thereof, but the present invention is not limited thereto. For example, the cylindrical portion 51 may also be provided with a plurality of linear contact portions 43.

[0105] In the female terminal 31 of the above-described embodiment, each protrusion 56 may be provided only at an intermediate position in the axial direction of the divided cylindrical portion 52 . The number of divided cylindrical portions 52 included in the cylindrical portion 51 of the above-described embodiment is not particularly limited. For example, the cylindrical portion 51 may include three or more divided cylindrical portions 52 .

[0106] The configuration of the slit 53 in the above-described embodiment can be modified as appropriate. The slit 53 may be omitted. In this case, for example, the cylindrical portion 51 is not divided in the axial direction of the cylindrical connecting portion 60 , and one protrusion 56 is provided on the inner surface 54 .

[0107] The protection portion 100 in the above embodiment may be formed integrally with the peripheral wall 50. In this case, the protection portion 100 is formed so as to be folded back from the end of the peripheral wall 50 in the first direction X1 toward the end of the peripheral wall 40 in the first direction X1, for example.

[0108] The protection portion 100 of the female terminal 31 may be omitted. The position of the winding pressing portion 90 in the female terminal 31 can be changed as appropriate. For example, the winding pressing portion 90 can be provided at a position different from that of the connecting portion 70 in the X-axis direction.

[0109] In the above embodiment, the contact pressure on the columnar connection part 201 is ensured by limiting the distance between the inner surface 42 and the inner surface 54 by the winding pressing part 90, but the present invention is not limited thereto. For example, a biasing member such as a coil spring separate from the peripheral walls 40 and 50 may be used to ensure the contact pressure on the columnar connection part 201.

[0110] In the above embodiment, the wire connection portion 32 is formed integrally with the peripheral wall 40 , but the present invention is not limited thereto. For example, the wire connection portion 32 may be formed integrally with the peripheral wall 50 . In the female terminal 31 of the above embodiment, only the terminal connection part 33 of the wire connection part 32 and the terminal connection part 33 is formed by folding the peripheral wall 50 in two and overlapping the peripheral wall 40. The present invention is not limited to this, and for example, both the wire connection part 32 and the terminal connection part 33 may be formed by folding two plates.

[0111] The housing body 110 in the above-described embodiment may be modified as appropriate as long as it has a structure capable of accommodating the female terminal 31 . The configuration of the stopper 120 in the above-described embodiment can be modified as appropriate. For example, the restriction portion 122 may be omitted.

[0112] The shape of the terminal portion 202 of the columnar connection portion 201 in the above embodiment can be modified as appropriate. For example, the inclined surface 204 of the terminal portion 202 may be formed to be inclined at an angle different from that of the inclined surface 63 .

[0113] In the above embodiment, the columnar connection part 201 of the male terminal 200 is embodied as a cylindrical shape, but it is not limited thereto. For example, the columnar connection part 201 may be formed into a columnar shape other than a cylindrical shape. For example, the cross-sectional shape of the columnar connection part 201 may be formed into an elliptical or polygonal shape.

[0114] The embodiments disclosed herein are to be considered in all respects as illustrative rather than restrictive. The scope of the present invention should not be limited based on the above contents but should be indicated by the claims, and is intended to include all modifications within the scope and meaning equivalent to the claims. Description of Reference Numerals

[0115] 20…electric wire, 21…core wire, 22…insulating coating, 30…housing, 31…female terminal, 32…electric wire connection portion, 33…terminal connection portion, 40…peripheral wall (second peripheral wall), 41…cylindrical portion (second cylindrical portion), 42…inner surface (second inner surface), 43…linear contact portion, 48…notch, 50…peripheral wall (first peripheral wall), 51…cylindrical portion (first cylindrical portion), 52…divided cylindrical portion, 53…slit, 54…inner surface (first inner surface) Surface), 55...recessed portion, 56...protrusion, 56A...protruding end, 57...dividing portion, 58...notch portion, 60...tubular connecting portion, 61...introduction portion (first introduction portion), 62...introduction portion (second introduction portion), 63...inclined surface (first inclined surface), 64...inclined surface (second inclined surface), 65...guide portion, 66...inclined surface (third inclined surface), 70...connecting portion, 71, 72...extending portion, 73...returning portion, 80...protruding portion, 81...protruding portion base, 82... protrusion, 90... winding pressing portion, 91... extension portion, 92... folding portion, 93... pressing portion, 94... opposing surface, 95... through hole, 96... engaging surface, 100... protection portion, 101... extension portion, 102... protection wall, 110... housing body, 111... opening portion, 112... peripheral wall, 113... barrel portion, 114... insertion hole, 120... stopper, 121... main body, 122... restriction portion, 123... insertion hole, 200... male end Sub, 201…columnar connecting portion, 202…end portion, 203…end surface, 204…inclined surface, A1…center, C1…connector, U1…terminal unit, W1…wiring harness, CA1…center axis, CA2…center axis, L1…first distance, X1…first direction, X2…first opposite direction, Y1…second direction, Y2…second opposite direction, Z1…third direction, Z2…third opposite direction, S1…first inclined direction, S2…second inclined direction.

Claims

1. A female terminal, comprising: A first peripheral wall extending along a first direction; a second peripheral wall extending along the first direction and facing the first peripheral wall in a second direction orthogonal to the first direction; A first cylindrical portion, disposed on the first peripheral wall; a second cylindrical portion, provided on the second peripheral wall in a manner opposing the first cylindrical portion; as well as The cylindrical connecting portion is composed of the first cylindrical portion and the second cylindrical portion. The axial direction of the cylindrical connecting portion extends along a third direction intersecting both the first direction and the second direction. The cylindrical connection portion is a portion into which the columnar connection portion of the male terminal is inserted along the third direction and electrically connected to the male terminal. The first cylindrical portion and the second cylindrical portion both have a first introduction portion, the first introduction portion is provided at the first end portions in the axial direction of the first cylindrical portion and the second cylindrical portion, and introduces the columnar connection portion into the interior of the cylindrical connection portion. The inner peripheral surface of the first introduction portion is formed as a first inclined surface that is inclined toward the radially outer side of the cylindrical connection portion as it approaches a first opening end of the cylindrical connection portion located at the first end portion.

2. The female terminal according to claim 1, wherein: The first introduction portion is formed to protrude outward from the outer peripheral surface of the portion of the tubular connecting portion other than the first introduction portion. The thickness of the first introduction portion is equal to the thickness of a portion of the tubular connecting portion excluding the first introduction portion.

3. The female terminal according to claim 1, wherein: The first cylindrical portion and the second cylindrical portion both have a second introduction portion, the second introduction portion is provided at the second end portions in the axial direction of the first cylindrical portion and the second cylindrical portion, and introduces the columnar connection portion into the interior of the cylindrical connection portion. The inner peripheral surface of the second introduction portion is formed as a second inclined surface that is inclined toward the radially outer side of the tubular connecting portion as it moves toward a second opening end of the tubular connecting portion located at the second end portion.

4. The female terminal according to claim 1, wherein: The first cylindrical portion includes a plurality of divided cylindrical portions divided along the axial direction. Each of the plurality of divided cylindrical portions includes a first inner surface facing the second cylindrical portion and a protrusion protruding from the first inner surface toward the radially inner side of the cylindrical connecting portion with an arc-shaped cross section.

5. The female terminal according to claim 4, wherein: The plurality of split cylindrical portions are two split cylindrical portions, The first cylindrical portion has a slit that separates the two divided cylindrical portions. The slit is provided at a central position of the cylindrical connecting portion in the axial direction.

6. The female terminal according to claim 5, wherein: Each of the two divided cylindrical portions has a guide portion, and the guide portion is provided at a third end portion directly communicating with the slit. The inner peripheral surface of the guide portion is formed as a third inclined surface, and the third inclined surface is inclined toward the radially outer side of the cylindrical connecting portion as it approaches the slit. The guide portion is formed so that the thickness of the divided cylindrical portion becomes thinner toward the slit.

7. The female terminal according to claim 6, wherein: The first inclined surface extends along a first inclined direction inclined at a first inclination angle with respect to the central axis of the cylindrical connecting portion. The third inclined surface extends along a second inclined direction inclined at a second inclination angle relative to the central axis. A size of the first inclined surface extending along the first inclined direction is larger than a size of the third inclined surface extending along the second inclined direction.

8. The female terminal according to claim 7, wherein: The first inclination angle is smaller than the second inclination angle.

9. The female terminal according to claim 4, wherein: The second cylindrical portion has a second inner surface opposite to the first inner surface, The female terminal further includes a winding pressing portion for limiting the spacing distance between the first inner surface and the second inner surface. The winding pressing portion is formed integrally with the second peripheral wall. The wrapping and pressing portion extends from the second peripheral wall, is folded back while wrapping an end edge of the first peripheral wall inside, and is in contact with an outer surface of the first peripheral wall.

10. A terminal unit comprising: The female terminal according to any one of claims 1 to 9; and The male terminal includes the columnar connecting portion inserted into the cylindrical connecting portion.

11. The terminal unit according to claim 10, wherein: The columnar connection portion has a terminal portion formed in a tapered shape, and an outer peripheral surface of the terminal portion extends parallel to the first inclined surface.

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