Patent Publication Number: US-11024983-B2

Title: Terminal-equipped electric wire

Description:
CROSS-REFERENCE TO RELATED APPLICATION(S) 
     The present application claims priority to and incorporates by reference the entire contents of Japanese Patent Application No. 2019-095021 filed in Japan on May 21, 2019. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a terminal-equipped electric wire. 
     2. Description of the Related Art 
     Conventionally, there have been techniques for applying a resin to a terminal-equipped electric wire as disclosed in Japanese Patent Application Laid-open No. 2016-181387 and Japanese Patent Application Laid-open No. 2015-41404, Japanese Patent Application Laid-open No. 2016-181387 discloses a terminal-equipped electric wire including a covered electric wire, a terminal including a conductor crimp portion and a covering crimp portion, and an ultraviolet-curable resin member covering the conductor exposed from an insulating covering. In the terminal-equipped electric wire of Japanese Patent Application Laid-open No. 2016-181387, the whole of the conductor crimping portion and the covering crimp portion is covered with a resin member. 
     Here, applying a resin to the covering crimp portion might cause an increase in the terminal height. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a terminal-equipped electric wire capable of improving the anticorrosion performance while suppressing the terminal height. 
     In order to achieve the above mentioned object, a terminal-equipped electric wire according to one aspect of the present invention includes an electric wire having a core wire and a covering that exposes an end portion of the core wire and covers the core wire; a crimp terminal having a core wire crimp portion crimped to the core wire, and a covering crimp portion crimped to the covering; and a resin that integrally covers a range from a tip of the core wire to a side surface of the covering crimp portion and that shields the core wire from an external space, wherein the covering crimp portion includes a bottom wall portion, a first crimping piece extending from one end of the bottom wall portion in a width direction, and a second crimping piece extending from another end of the bottom wall portion in the width direction, the covering crimp portion has a configuration in which each of the bottom wall portion, the first crimping piece, and the second crimping piece is in close contact with the covering, and the covering crimp portion is crimped to the covering with the first crimping piece laid over a tip portion of the second crimping piece, and the resin closes a gap surrounded by a tip surface of the second crimping piece, an inner surface of the first crimping piece, and an outer surface of the covering, from the core wire crimp portion side. 
     The above and other objects, features, advantages and technical and industrial significance of this invention will be better understood by reading the following detailed description of presently preferred embodiments of the invention, when considered in connection with the accompanying drawings. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a perspective view illustrating a crimp terminal and an electric wire of an embodiment; 
         FIG. 2  is a cross-sectional view of an electric wire according to an embodiment; 
         FIG. 3  is a cross-sectional view of a terminal crimping device according to an embodiment; 
         FIG. 4  is a front view of a terminal crimping device of an embodiment when an upper mold is at a bottom dead center; 
         FIG. 5  is a plan view of a terminal-equipped electric wire according to an embodiment before a resin is applied; 
         FIG. 6  is a cross-sectional view of a core wire crimp portion of a terminal-equipped electric wire according to an embodiment; 
         FIG. 7  is a cross-sectional view of a covering crimp portion of a terminal-equipped electric wire according to an embodiment; 
         FIG. 8  is a plan view illustrating a resin application range of an embodiment; 
         FIG. 9  is a plan view of a terminal-equipped electric wire according to an embodiment; 
         FIG. 10  is a longitudinal cross-sectional view of a terminal-equipped electric wire according to an embodiment; 
         FIG. 11  is a lateral cross-sectional view of a terminal-equipped electric wire according to an embodiment; and 
         FIG. 12  is a front view of an application device according to an embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, a terminal-equipped electric wire according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited by the embodiment. Moreover, components in the following embodiment include those that can be easily assumed by those skilled in the art or substantially identical. 
     Embodiment 
     An embodiment will be described with reference to  FIGS. 1 to 12 . The present embodiment relates to a terminal-equipped electric wire.  FIG. 1  is a perspective view illustrating a crimp terminal and an electric wire of the embodiment.  FIG. 2  is a cross-sectional view of the electric wire according to the embodiment.  FIG. 3  is a cross-sectional view of a terminal crimping device according to the embodiment.  FIG. 4  is a front view of the terminal crimping device of the embodiment when an upper mold is at the bottom dead center.  FIG. 5  is a plan view of the terminal-equipped electric wire according to the embodiment before resin is applied.  FIG. 6  is a cross-sectional view of a core wire crimp portion of the terminal-equipped electric wire according to the embodiment.  FIG. 7  is a cross-sectional view of a covering crimp portion of the terminal-equipped electric wire according to the embodiment.  FIG. 8  is a plan view illustrating a resin application range of the embodiment.  FIG. 9  is a plan view of the terminal-equipped electric wire according to the embodiment.  FIG. 10  is a longitudinal cross-sectional view of the terminal-equipped electric wire according to the embodiment.  FIG. 11  is a lateral cross-sectional view of the terminal-equipped electric wire according to the embodiment. 
       FIG. 6  illustrates a cross section taken along line VI-VI of  FIG. 5 .  FIG. 7  illustrates a cross section taken along line VII-VII of  FIG. 5 .  FIG. 10  illustrates a cross section taken along line X-X of  FIG. 9 .  FIG. 11  illustrates a cross section taken along line XI-XI of  FIG. 9 . 
     As illustrated in  FIG. 1 , a crimp terminal  1  according to the present embodiment includes a terminal connecting portion  11 , a core wire crimp portion  12 , and a covering crimp portion  13 . The terminal connecting portion.  11 , the core wire crimp portion  12 , and the covering crimp portion  13  are arranged in this order in a longitudinal direction of the crimp terminal  1 . The crimp terminal  1  is formed from a conductive metal plate (for example, a copper plate or a copper alloy plate) as a base material. The crimp terminal  1  is formed into a predetermined shape by punching or bending the base material. The surface of the crimp terminal  1  may be plated with tin (Sn) or the like. 
     In the description of the crimp terminal  1  in the present specification, a connection direction with the counterpart terminal, that is, an insertion direction with respect to the counterpart terminal is referred to as a first direction L. The first direction L is the longitudinal direction of the crimp terminal  1 . A width direction of the crimp terminal  1  is referred to as a second direction W. The second direction W is orthogonal to the first direction L. In the crimp terminal  1 , a direction orthogonal to both the first direction L and the second direction W is referred to as a third direction H. The third direction H is a compression direction by an upper mold  50  when the crimp terminal  1  is crimped. The third direction H is a height direction of the crimp terminal  1 . 
     The terminal connecting portion  11  is a portion electrically connected to a counterpart terminal. The shape of the terminal connecting portion  11  of the present embodiment is a rectangular tube shape. The core wire crimp portion  12  is a portion to be crimped to a core wire  61  of an electric wire  60 . The electric wire  60  includes a core wire  61  and an insulating covering  62  covering the core wire  61 . Examples of the material of the core wire  61  include copper and aluminum. As illustrated in  FIG. 2 , the cross-sectional shape of the electric wire  60  of the present embodiment is circular. The outer diameter of the electric wire  60  is referred to as a finished outer diameter D. The finished outer diameter D is the outer diameter of the electric wire  60  before the crimp terminal  1  is crimped to the electric wire  60 . The finished outer diameter D of the terminal-equipped electric wire  2  (refer to  FIG. 8  or the like) corresponds to an outer diameter of the covering  62  of a portion  60   a  of the electric wire  60  to which the crimp terminal  1  is not crimped. 
     As illustrated in  FIG. 1 , in the electric wire  60 , the covering  62  at the end is removed to expose the core wire  61  by a predetermined length. The core wire  61  of the present embodiment is a group of a plurality of strands. Alternatively, the core wire  61  may be a single wire such as a coaxial cable. The crimp terminal  1  is crimped to the end portion of the electric wire  60  and thereby electrically connected to the exposed core wire  61 . 
     The shape of the core wire crimp portion  12  before being crimped to the core wire  61  is a U-shape as illustrated in  FIG. 1 . The core wire crimp portion  12  includes a bottom wall portion  21 , a first crimping piece  22 , and a second crimping piece  23 . The bottom wall portion  21  is a portion to be a bottom wall of the core wire crimp portion  12 , and is supported by a lower mold  40  described below. The first crimping piece  22  and the second crimping piece  23  are a pair of conductor crimping pieces to be crimped to the core wire  61 . The first crimping piece  22  is a side wall portion extending from one end of the bottom wall portion  21  in the width direction. The second crimping piece  23  is a side wall portion extending from the other end in the width direction of the bottom wall portion  21 . The first crimping piece  22  and the second crimping piece  23  extend in a direction intersecting the width direction of the bottom wall portion  21 . The first crimping piece  22  and the second crimping piece  23  face each other in the second direction W. As illustrated in  FIG. 1 , the interval between the first crimping piece  22  and the second crimping piece  23  increases from the bottom wall portion  21  side toward the tip side. 
     As illustrated in  FIG. 1 , the covering crimp portion  13  includes a bottom wall portion  31 , a first crimping piece  32 , and a second crimping piece  33 . The shape of the covering crimp portion  13  before being crimped to the covering  62  is a U-shape as illustrated in  FIGS. 1 and 3 . The bottom wall portion  31  is a portion to be a bottom wall of the covering crimp portion  13 . The first crimping piece  32  and the second crimping piece  33  are a pair of covering crimping pieces to be crimped to the covering  62 . The first crimping piece  32  is a side wall portion extending from one end of the bottom wall portion  31  in the width direction. The second crimping piece  33  is a side wall portion extending from the other end of the bottom wall portion  31  in the width direction. The first crimping piece  32  and the second crimping piece  33  face each other in the second direction W. The interval between the first crimping piece  32  and the second crimping piece  33  increases from the bottom wall portion  31  side toward the tip side. 
     The terminal connecting portion  11  and the core wire crimp portion  12  are connected via an intermediate portion  14 . The height of the intermediate portion  14  is lower than any of the height of the terminal connecting portion  11  and the height of the core wire crimp portion  12 . The core wire crimp portion  12  and the covering crimp portion  13  are connected via an intermediate portion  15 . The intermediate portion  15  includes a bottom wall portion  15   a  and a side wall portion  15   b . The bottom wall portion  15   a  connects the bottom wall portion  21  of the core wire crimp portion  12  with the bottom wall portion  31  of the covering crimp portion  13 . The side wall portion  15   b  extends from both ends of the bottom wall portion  15   a  in the width direction. One side wall portion  15   b  connects the first crimping piece  22  of the core wire crimp portion  12  with the first crimping piece  32  of the covering crimp portion  13 . The other side wall portion  15   b  connects the second crimping piece  23  of the core wire crimp portion  12  with the second crimping piece  33  of the covering crimp portion  13 . The height of the side wall portion  15   b  is lower than any of the heights of the crimping pieces  22  and  23  of the core wire crimp portion  12  and the heights of the crimping pieces  32  and  33  of the covering crimp portion  13 . 
     As illustrated in  FIG. 1 , the electric wire  60  is mounted on the crimp terminal  1  such that an axial-direction of the electric wire  60  is aligned with the longitudinal direction of the crimp terminal  1 . In a state of being mounted on the crimp terminal  1 , a tip  61   a  of the core wire  61  is directed to the terminal connecting portion  11 . The core wire  61  exposed to the outside from the covering  62  is mounted on the core wire crimp portion  12 . At this time, the tip  61   a  of the core wire  61  may protrude from the core wire crimp portion  12  to the terminal connecting portion  11  side. The covering  62  of the electric wire  60  is mounted on the covering crimp portion  3 . The electric wire  60  is installed so that a tip  62   a  of the covering  62  is positioned between the core wire crimp portion  12  and the covering crimp portion  13 , for example. 
     The core wire crimp portion  12  and the covering crimp portion  13  are crimped to the electric wire  60  by the lower mold  40  and the upper mold  50  as illustrated in  FIG. 3 . The lower mold  40  and the upper mold  50  are components of a terminal crimping device  100 . The lower mold  40  is a support-side mold that supports the core wire crimp portion  12  and the covering crimp portion  13  from below. A support surface  40   a  of the lower mold  40  supports an outer surfaces of the bottom wall portions  21  and  31  of the crimp terminal  1 . The cross-sectional shape of the support surface  40   a  is an arc shape, for example.  FIG. 3  illustrates the covering crimp portion  13  supported by the lower mold  40 . The first crimping piece  32  and the second crimping piece  33  are in a posture extending diagonally upward from the bottom wall portion  31  in a state where the covering crimp portion  13  is supported by the lower mold  40 . Similarly, the lower mold  40  supports the core wire crimp portion  12  from below. 
     In the covering crimp portion  13  of the present embodiment, the length of the second crimping piece  33  is equal to the length of the first crimping piece  32 . Therefore, in a state where the covering crimp portion  13  is mounted on the support surface  40   a , a tip surface  33   a  of the second crimping piece  33  is positioned at the same height as a tip surface  32   a  of the first crimping piece  32  in the third direction H. 
     The upper mold  50  is a terminal crimping mold that sandwiches the crimp terminal  1  and the electric wire  60  between the lower mold  40  and oneself and thereby crimps the crimp terminal  1  to the electric wire  60 . The upper mold  50  sandwiches the core wire crimp portion  12  and the core wire  61  between the lower mold  40  and oneself and thereby crimps the core wire crimp portion  12  to the core wire  61 . In addition, the upper mold  50  sandwiches the covering crimp portion  13  and the covering  62  between the lower mold  40  and oneself and thereby crimps the covering crimp portion  13  to the covering  62 . As illustrated in  FIG. 3 , the upper mold  50  is disposed above the lower mold  40 . The upper mold  50  moves relative to the lower mold  40  in the third direction H. The terminal crimping device  100  includes a driving device that moves the upper mold  50  up and down in the third direction H. 
     The upper mold  50  has a crimping surface  51  that crimps the covering crimp portion  13 . The crimping surface  51  includes a first wall surface  52 , a second wall surface  53 , and a facing surface  54 . The first wall surface  52 , the second wall surface  53 , and the facing surface  54  are continuous with each other and form a groove opening downward. The first wall surface  52  and the second wall surface  53  face each other in the second direction W. The first wall surface  52  includes a flat portion  52   a  and a curved portion  52   b . The second wall surface  53  includes a flat portion  53   a  and a curved portion  53   b . The flat portions  52   a  and  53   a  extend in the first direction L and the third direction H, and are orthogonal to the second direction W. The flat portions  52   a  and  53   a  face each other in the second direction W and are parallel to each other. 
     The curved portions  52   b  and  53   b  extend downward from the flat portions  52   a  and  53   a , respectively. The curved portions  52   b  and  53   b  face each other in the second direction W, and are gently curved so that the interval between the curved portions increases downward. A boundary  52   c  between the flat portion  52   a  and the curved portion  52   b  is located above a boundary  53   c  between the flat portion  53   a  and the curved portion  53   b . This gives a sufficient time difference between the timing when the second crimping piece  33  starts to bend and the timing when the first crimping piece  32  starts to bend. Accordingly, in the crimping step, the second crimping piece  33  is wound around the covering  62  before the first crimping piece  32 . In other words, the second crimping piece  33  enters between the first crimping piece  32  and the covering  62 . 
     The facing surface  54  connects an upper end of the first wall surface  52  and an upper end of the second wall surface  53 . The facing surface  54  faces the support surface  40   a  of the lower mold  40  in the third direction H. The facing surface  54  is a curved surface that is recessed upward. The facing surface  54  includes a central portion  54   a  located at the center in the second direction W, and connecting portions  54   b  and  54   c  located at both ends in the second direction W. The central portion  54   a  and the connecting portions  54   b ,  54   c  are each curved to protrude upward. 
     The connecting portion  54   b  connects the central portion  54   a  with the flat portion  52   a  of the first wall surface  52 . The connecting portion  54   c  connects the central portion  54   a  with the flat portion  53   a  of the second wall surface  53 . The curvatures of the connecting portions  54   b  and  54   c  gradually vary from the central portion  54   a  toward the flat portions  52   a  and  53   a.    
     The flat portions  52   a  and  53   a  of the present embodiment are configured to enable the first crimping piece  32  and the second crimping piece  33  to be brought into close contact with the covering  62  of the electric wire  60 , as described below. More specifically, an interval Wd 1  between the flat portion  52   a  of the first wall surface  52  and the flat portion  53   a  of the second wall surface  53  is defined so as to allow the covering  62  to be compressed from both sides in the second direction W by the crimping pieces  32  and  33 . The interval Wd 1  in the second direction W satisfies the following Formula (1). The interval Wd 1  preferably satisfies the following Formula (2). Here, D: the finished outer diameter of the electric wire  60 , and t: the plate thickness of the covering crimp portion  13 .
 
 Wd 1 &lt;D+ 2× t   (1)
 
 Wd 1&gt; D   (2)
 
     The position of the bottom dead center of the upper mold  50  is defined to enable the first crimping piece  32  and the second crimping piece  33  to be brought into close contact with the covering  62  of the electric wire  60 .  FIG. 4  illustrates the terminal crimping device  100  in a state where the upper mold  50  is at the bottom dead center. In a case where the upper mold  50  is at the bottom dead center, a distance Ht 1  between the support surface  40   a  and the facing surface  54  is defined to allow the covering crimp portion  13  to compress the covering  62  from both sides in the third direction H. Note that the distance Ht 1  is a distance in the third direction H from a lowermost portion  40   b  of the support surface  40   a  to an uppermost portion  54   d  of the facing surface  54 . In the present embodiment, the lowermost portion  40   b  of the support surface  40   a  corresponds to the center of the support surface  40   a  in the second direction W. The uppermost portion  54   d  of the facing surface  54  corresponds to the center of the facing surface  54  in the second direction W. That is, the lowermost portion  40   b  and the uppermost portion  54   d  are on an identical line in the third direction H. 
     The distance Ht 1  satisfies the following Formula (3). The distance Ht 1  preferably satisfies the following Formula (4).
 
 Ht 1&lt; D+ 3× t   (3)
 
 Ht 1&gt; D+t   (4)
 
     A downward movement of the upper mold  50  to the bottom dead center will allow the crimp terminal  1  to be crimped to the electric wire  60  as illustrated in  FIGS. 5 to 7 . As illustrated in  FIG. 5 , the core wire crimp portion  12  is crimped to the core wire  61 . The tip  61   a  of the core wire  61  protrudes from the core wire crimp portion  12  toward the terminal connecting portion  11 . The covering crimp portion  13  is crimped to the covering  62 . An intermediate exposed portion  61   b  of the core wire  61  is exposed between the core wire crimp portion  12  and the covering crimp portion  13 . Furthermore, the end of the covering  62  is exposed from the covering crimp portion  1  toward the core wire crimp portion  12  side. 
     As illustrated in  FIG. 6 , the core wire crimp portion  12  is crimped to the core wire  61  in a substantially B shape. The cross-sectional shape of each of the first crimping piece  22  and the second crimping piece  23  after crimping is a curved shape protruding toward the side opposite to the bottom wall portion  21  side. More specifically, the first crimping piece  22  has a curved portion  22   b  and a base portion  22   c . The base portion  22   c  is a portion extending linearly from the bottom wall portion  21  in the third direction H. The curved portion  22   b  is a portion of the first crimping piece  22  on more tip side compared with the base portion  22   c , and is curved outward. 
     The second crimping piece  23  includes a curved portion  23   b  and a base portion  23   c . The base portion  23   c  is a portion extending linearly from the bottom wall portion  21  in the third direction H. The curved portion  23   b  is a portion of the second crimping piece  23  on more tip side compared with the base portion  23   c , and is curved outward. A portion where an outer surface  22   d  of the first crimping piece  22  and an outer surface  23   d  of the second crimping piece  23  come in contact is formed into a groove  24 . The groove  24  extends in the first direction L. 
     As illustrated in  FIG. 7 , the covering crimp portion  13  has an annular shape, and is crimped to the covering  62  with the first crimping piece  32  layered over the second crimping piece  33 . Each of the cross-sectional shapes of the first crimping piece  32  and the second crimping piece  33  after crimping is a shape protruding outward. More specifically, the first crimping piece  32  has a curved portion  32   b  and a base portion  32   c . The base portion  32   c  is a portion extending linearly from the bottom wall portion  31  in the third direction H. The curved portion  32   b  is a portion of the first crimping piece  32  on more tip side compared with the base portion  32   c . The curved portion  32   b  is curved outward. In the curved portion  32   b , the tip is located on the uppermost side. 
     The second crimping piece  33  has a curved portion  33   b  and a base portion  33   c . The base portion  33   c  is a portion extending linearly from the bottom wall portion  31  in the third direction H. The curved portion  33   b  is a portion of the second crimping piece  33  on more tip side compared with the base portion  33   c , and is curved outward. The tip surface  33   a  of the second crimping piece  33  is located on more toward the first crimping piece  32  side of a center  31   c  of the bottom wall portion  31  in the width direction of the bottom wall portion  31 . Furthermore, the tip surface  33   a  of the second crimping piece  33  is directed toward the bottom wall portion  31  side and faces the bottom wall portion  31  in the third direction H. The curved portion  33   b  of the second crimping piece  33  covers an upper portion  62   b  of the covering  62  and is in close contact with the upper portion  62   b.    
     The second crimping piece  33  is crimped to the covering  62  such that the tip surface  33   a  is buried in the covering  62 , for example. In the crimping step, the first crimping piece  32  is layered over a tip portion  33   e  of the second crimping piece  33  and pushes the tip portion  33   e  toward the covering  62 . This results in formation of a recess  62   c  corresponding to a corner  33   g  of the second crimping piece  33 , in the covering  62 . The corner  33   g  is a portion at which the inner surface of the second crimping piece  33  and the tip surface  33   a  intersect. The tip surface  33   a  faces an outer surface  62   d  of the covering  62 , and preferably is in contact with the covering  62 . 
     The first crimping piece  32  is layered over the tip portion  33   e  of the second crimping piece  33 . More specifically, the first crimping piece  32  is layered over a portion of the second crimping piece  33  between the tip surface  33   a  and a top  33   f . The top  33   f  is a portion of the curved portion  33   b , that is located farthest from the bottom wall portion  31  in the third direction H. That is, the first crimping piece  32  covers substantially half of the curved portion  33   b  on the base portion  32   c  side. 
     In the terminal-equipped electric wire  2  of the present embodiment, a gap  4  is closed by the resin  3  described below. The gap  4  is a gap surrounded by the tip surface  33   a  of the second crimping piece  33 , an inner surface  32   e  of the first crimping piece  32 , and the outer surface  62   d  of the covering  62 . The gap  4  might have a cross-sectional area large enough to be visually recognized or might be too small to be visually recognized. The gap  4  is a gap that allows infiltration of water, for example. In the terminal-equipped electric wire  2  of the present embodiment, closing the gap  4  with the resin  3  will ensure the anticorrosion performance. 
     In the covering crimp portion  13  after the crimping, the base portion  32   c  of the first crimping piece  32  may be parallel to the base portion  33   c  of the second crimping piece  33 . In the present embodiment, the outer surface of the base portion  32   c  and the outer surface of the base portion  33   c  are parallel to each other and are orthogonal to the second direction W. The base portions  32   c  and  33   c  are respectively formed by the flat portions  52   a  and  53   a  of the upper mold  50 . 
     In the covering crimp portion  13 , the bottom wall portion  31 , the first crimping piece  32 , and the second crimping piece  33  are each in close contact with the covering  62 . In other words, the covering crimp portion  13  is in close contact with the outer peripheral surface of the covering  62  over the entire circumference. Furthermore, the covering crimp portion  13  compresses the covering  62  inward in the radial direction over the entire circumference. Accordingly, the covering  62  is compressed in a state of being sandwiched between the covering crimp portion  13  and the core wire  61 . As a result, the covering  62  generates a repulsive force repelling toward the covering crimp portion  13 . Therefore, generation of a gap between the covering crimp portion  13  and the covering  62  is suppressed. 
     The covering crimp portion  13  according to the present embodiment is cramped to the covering  62  so as to satisfy the following Formulas (5) and (7). The covering crimp portion  13  is preferably crimped to the covering  62  so as to satisfy the following Formulas (6) and (8). Here, CH: terminal height in the covering crimp portion  13 , and CW: terminal width in the covering crimp portion  13 . The terminal height CH of the covering crimp portion  13  is, for example, the maximum dimension in the third direction H in the lateral cross section of the covering crimp portion  13 . The terminal height CH of the present embodiment is a height from the outer surface of the center  31   c  of the bottom wall portion  31  to the outer surface of the tip of the first crimping piece  32 . The terminal width CW of the covering crimp portion  13  is, for example, the maximum dimension in the second direction W in the lateral cross section of the covering crimp portion  13 . The terminal width CW of the present embodiment is a distance in the second direction W from the outer surface of the base portion  32   c  to the outer surface of the base portion  33   c.  
 
 CH&lt;D+ 3× t   (5)
 
 CH&gt;D+t   (6)
 
 CW&lt;D+ 2× t   (7)
 
 CW&gt;D   (8)
 
     When Formulas (5) and (7) are satisfied, the covering crimp portion  13  is crimped to the covering  62  while compressing the covering  62  toward the core wire  61  in each of the second direction W and the third direction H. The covering crimp portion  13  of the present embodiment is crimped so that the terminal width CW and the terminal height CH are substantially equal to each other. However, the relationship between the terminal width CW and the terminal height CH is not limited to the above relationship. For example, the covering crimp portion  13  may be crimped so that the terminal width CW is larger than the terminal height CH, or may be crimped so that the terminal height CH is larger than the terminal width CW. 
     Furthermore, in the terminal-equipped electric wire  2  of the present embodiment, the shape of the covering crimp portion  13  after crimping is designed so that the gap  4  can be easily closed by the resin  3 . Specifically, a height ΔH of the tip portion  33   e  of the second crimping piece  33  satisfies the following Formula (9). Here, the height ΔH is a distance in the third direction H from the top  33   f  to the lower end of the tip surface  33   a . The gap  4  is located near the top  33   f  in the third direction H, making it easy to apply the resin  3  so as to close the gap  4 .
 
 t&lt;ΔH≤ 2× t   (9)
 
     After completion of the crimping step of crimping the crimp terminal  1  on the electric wire  60 , an application step of applying a resin  3  is executed.  FIG. 8  illustrates an application range B 1  within which the resin  3  is applied. The application range B 1  is a region expanding in the first direction L and the second direction W. The application range B 1  is a range including from the tip  61   a  of the core wire  61  to side surfaces  32   d  and  33   d  of the covering crimp portion  13 . More specifically, the application range B 1  is a region including the tip  61   a  of the core wire  61  including an end surface  61   c , a bottom portion  14   a  and an end surface  14   b  of the intermediate portion  14 , the groove  24  of the core wire crimp portion  12 , the intermediate exposed portion  61   b , an end surface  15   c  of the intermediate portion  15 , the side surface  32   d  of the first crimping piece  32 , and the side surface  33   d  of the second crimping piece  33 . The side surfaces  32   d  and  33   d  are side surfaces on the core wire crimp portion  12  side, and are surfaces facing the core wire crimp portion  12  side. 
     In the application step, the resin  3  is applied by an application device  70  illustrated in  FIG. 12 , for example. The application device  70  includes a main body  71 , an injection unit  72 , and a holding unit  73 . The injection unit  72  is supported by the main body  71  via an arm unit  74 . The injection unit  72  includes a nozzle  72   a  and an injection mechanism  72   b . The nozzle  72   a  is a cylindrical hollow member. a ejection port  72   c  at the tip of the nozzle  72   a  faces the holding unit  73 . The injection mechanism  72   b  is a mechanism for intermittently injecting droplets  7  of the resin  3  from the nozzle  72   a.    
     The holding unit  73  is a portion that holds the crimp terminal  1 , and is relatively movable with respect to the main body  71 . The application device  70  injects the droplets  7  of the resin  3  from the nozzle  72   a  while moving the holding unit  73  so as to apply the resin  3  to the electric wire  60  and the crimp terminal  1 . The applied resin  3  is an ultraviolet curable resin, for example. The resin  3  to be used may be a thermosetting resin or a two-component curable resin, for example. 
     As illustrated in  FIGS. 9 and 10 , the application device  70  applies the resin  3  to the application range B 1 . The core wire  61  is shielded from the external space by the applied resin  3 . The resin  3  serves as a protective film that covers the electric wire  60  and the crimp terminal  1  integrally and protects the core wire  61 . As illustrated in  FIG. 11 , the resin  3  is applied so as to close the gap  4  from the core wire crimp portion  12  side. That is, the resin  3  is applied so as to close the opening formed by the tip surface  33   a  of the second crimping piece  33 , the inner surface  32   e  of the first crimping piece  32 , and the outer surface  62   d  of the covering  62 . 
     The resin  3  is applied so as to cover the side surface  32   d  of the first crimping piece  32  and the side surface  33   d  of the second crimping piece  33 . The resin  3  is applied so as to cover a range from the outer surface of the covering  62  to the side surface  32   d  of the first crimping piece  32  in the radial direction. An application region of the resin  3  in the radial direction includes at least the tip surface  33   a  of the second crimping piece  33 . The resin  3  may be applied so as to cover the entire side surface  32   d  of the first crimping piece  32  and the entire side surface  33   d  of the second crimping piece  33 , as illustrated in  FIG. 11 . 
     When the application step is completed, a curing step is executed. The curing step is a step of curing the applied resin  3 . The ultraviolet curing resin  3  is irradiated with ultraviolet rays in a curing step. The curing step is executed to fix the resin  3  to the core wire  61 , the covering  62 , and the crimp terminal  1  so as to form a resin film that integrally covers the core wire  61 , the covering  62 , and the crimp terminal  1 . The curing step cures the resin  3  to complete formation of the terminal-equipped electric wire  2 . The resin.  3  cures in a state where the gap  4  is shielded from the core wire crimp portion  12  side. 
     As illustrated in  FIG. 11 , in the terminal-equipped electric wire  2  of the present embodiment, the tip surface  33   a  of the second crimping piece  33  is located farther, compared with the end surface  15   c  of the intermediate portion  15 , from the bottom wall portion  31  in the third direction H. Accordingly, the gap  4  is located above the end surface  15   c . This configuration makes it possible to allow the resin  3  applied to easily close the gap  4 . 
     Furthermore, as illustrated in  FIG. 10 , the tip  62   a  of the covering  62  protrudes from the covering crimp portion  13  toward the core wire crimp portion  12 . This enables the gap  4  to be easily closed by the resin  3  applied to the outer surface of the covering  62 . Furthermore, as illustrated in  FIG. 11 , the recess  62   c  formed in the covering  62  has a substantially V-shaped cross section. An other words, the shape of the recess  62   c  is a groove shape opening toward the side opposite to the bottom wall portion  31 . The applied resin  3  is stored in the recess  62   c , enabling the gap  4  to be easily closed by the resin  3 . 
     According to the terminal-equipped electric wire  2  of the present embodiment, infiltration of water is suppressed by the covering crimp portion  13  and the resin  3 , leading to suppression of a decrease in electrical performance. For example, when water enters the gap  4 , the water is blocked by the resin  3  film. The resin  3  regulates the entry of water into the electrical connection between the core wire  61  and the crimp terminal  1 , thereby suppressing occurrence of corrosion of the core wire  61  and the crimp terminal  1 . In addition, the covering crimp portion  13  is in close contact with the outer peripheral surface of the covering  62 , and suppresses the infiltration of water. In other words, the covering  62  functions as a seal in close contact with the covering crimp portion  13 . 
     As a comparative example, a terminal-equipped electric wire in which the resin  3  is applied to the upper surface of the covering crimp portion  13  in the application step will be considered. In the terminal-equipped electric wire of the comparative example, the terminal height CH in the covering crimp portion  13  is increased by an amount corresponding to the height of the applied resin  3 , leading to enlargement of the terminal-equipped electric wire. In contrast, the terminal-equipped electric wire  2  of the present embodiment can improve the anticorrosion performance without increasing the terminal height CH. Therefore, it is possible to improve the anticorrosion performance while using the existing combination of the crimp terminal  1  and the housing as is. 
     As described above, the terminal-equipped electric wire  2  according to the present embodiment includes the electric wire  60 , the crimp terminal  1 , and the resin  3 . The electric wire  60  includes: the core wire  61 ; and the covering  62  that exposes the end of the core wire  61  and covers the core wire  61 . The crimp terminal  1  includes: the core wire crimp portion  12  crimped to the core wire  61 ; and the covering crimp portion  13  crimped to the covering  62 . The resin  3  integrally covers the range from the tip  61   a  of the core wire  61  to the side surfaces  32   d  and  33   d  of the covering crimp portion  13  so as to shield the core wire  61  from the external space. 
     The covering crimp portion  13  includes the bottom wall portion  31 , the first crimping piece  32 , and the second crimping piece  33 . The first crimping piece  32  extends from one end of the bottom wall portion  31  in the width direction, and the second crimping piece  33  extends from the other end of the bottom wall portion  31  in the width direction. In the covering crimp portion  13 , the bottom wall portion  31 , the first crimping piece  32 , and the second crimping piece  33  are each crimped in close contact with the covering  62 . In addition, the covering crimp portion  13  is crimped with the first crimping piece  32  laid over the tip portion  33   e  of the second crimping piece  33 . 
     The resin  3  closes the gap  4  surrounded by the tip surface  33   a  of the second crimping piece  33 , the inner surface  32   e  of the first crimping piece  32 , and the outer surface  62   d  of the covering  62 , from the core wire crimp portion  12  side. According to the terminal-equipped electric wire  2  of the present embodiment, the infiltration of water through the gap  1  is suppressed by the resin  3 . In addition, the bottom wall portion  31 , the first crimping piece  32 , and the second crimping piece  33  are each in close contact with the covering  62 , making it possible to suppress infiltration of water into the electrical connection. Therefore, the terminal-equipped electric wire  2  of the present embodiment can improve the anticorrosion performance while suppressing the terminal height CH. 
     The crimp terminal  1  of the present embodiment includes the intermediate portion  15  that connects the bottom wall portion  31  with the core wire crimp portion  12  in the axial direction of the electric wire  60 . The tip surface  33   a  of the second crimping piece  33  is located farther, compared with the end surface  15   c  of the intermediate portion  15 , from the bottom wall portion  31  in the height direction of the crimp terminal  1 . The position of the tip surface  33   a  makes it easy to close the gap  4  with the applied resin  3 . 
     The terminal-equipped electric wire  2  of the present embodiment satisfies Formulas (5) and (7). Accordingly, it is possible to eliminate a gap between the covering crimp portion  13  and the covering  62 , enabling generation of a repulsive force in the covering  62 . This makes it possible to suitably suppress the infiltration of the corrosive liquid such as salt water into the electrical connection between the core wire  61  and the crimp terminal  1 .
 
 CH&lt;D+ 3× t   (5)
 
 CW&lt;D+ 2× t   (1)
 
     The tip surface  33   a  of the second crimping piece  33  of the present embodiment is located on more toward the first crimping piece  32  side of the center  31   c  of the bottom wall portion  31  in the width direction of the bottom wall portion  31 . The terminal-equipped electric wire  2  satisfies Formula (9) when the height from the tip surface  33   a  in the height direction of the crimp terminal  1  to the top  33   f  of the second crimping piece  33  is ΔH. Accordingly, the position of the gap  4  is a position that is easily closed by the applied resin  3 .
 
 t&lt;ΔH≤ 2× t   (9)
 
     Modification of Embodiment 
     A modification of an embodiment will be described. The crimping shape of the covering crimp portion  13  is not limited to the shape exemplified in the above embodiment. For example, the range in which the first crimping piece  32  and the second crimping piece  33  are laid with each other is appropriately determined. 
     The application range B 1  is not limited to the range exemplified in the above embodiment. The application range B 1  is appropriately determined so that the resin  3  integrally covers a range from the tip  61   a  of the core wire  61  to the side surfaces  32   d  and  33   d  of the covering crimp portion  13 . 
     The contents disclosed in the above embodiments and modification examples can be executed in appropriate combination with each other. 
     In the terminal-equipped electric wire according to the present embodiment, a covering crimp portion has a bottom wall portion, a first crimping piece, and a second crimping piece, each of which being close contact with the covering, and the covering crimp portion is crimped to the covering with the first crimping piece laid over a tip portion of the second crimping piece. Accordingly, the resin closes a gap surrounded by the tip surface of the second crimping piece, an inner surface of the first crimping piece, and an outer surface of the covering, from the side of the core wire crimp portion. It is possible to regulate infiltration of water through a covering crimp portion without applying resin to the upper surface of the covering crimp portion. Therefore, there is an effect of improving the anticorrosion performance while suppressing the terminal height. 
     Although the invention has been described with respect to specific embodiments for a complete and clear disclosure, the appended claims are not to be thus limited but are to be construed as embodying all modifications and alternative constructions that may occur to one skilled in the art that fairly fall within the basic teaching herein set forth.