Patent Publication Number: US-11050185-B2

Title: Connector

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. 2019-043287 filed in Japan on Mar. 11, 2019. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a connector. 
     2. Description of the Related Art 
     Conventionally, there is a connector having a packing. Japanese Patent Application Laid-open No. 2004-327169 discloses a technology of a connector having a packing provided between a first article and a second article to keep a space these articles watertight. The packing of Japanese Patent Application Laid-open No. 2004-327169 includes a protruding piece protruding from a position bisecting a thickness of a packing body and a fixed portion provided on the protruding piece and fixed to the first article. According to the packing of Japanese Patent Application Laid-open No. 2004-327169, the packing can be miniaturized, and the space between the articles can be surely waterproofed. 
     There is still room for improvement in suppressing displacement or detachment of the packing. For example, it is preferable that displacement or detachment of the packing in a case where a force acts on the packing can be more surely suppressed. 
     SUMMARY OF THE INVENTION 
     An object of the present invention is to provide a connector in which displacement of a packing or detachment of the packing can be suppressed. 
     In order to achieve the above mentioned object, a connector according to one aspect of the present invention includes a packing that includes a seal portion having an annular shape and a piece portion protruding from the seal portion and having a through-hole; and a fitting portion that holds a terminal, is mounted with the packing, and is fitted to a target to be fitted so that a space between the fitting portion and the target to be fitted is sealed by the packing, wherein the fitting portion includes: a first member that includes a cylindrical portion having an outer surface on which the seal portion is mounted; a second member that is attached to the cylindrical portion; a projection portion that is provided in one member of the first member and the second member, is inserted into the through-hole, and includes a tip projecting from the through-hole; and an opening portion that is provided in the other member of the first member and the second member and into which the tip is inserted. 
     According to another aspect of the present invention, in the connector, it is preferable that the through-hole is located closer to the target to be fitted than the seal portion is, in a direction in which the fitting portion and the target to be fitted are fitted to each other. 
     According to still another aspect of the present invention, in the connector, it is preferable that the piece portion includes a base portion that protrudes from the seal portion along the direction in which the fitting portion and the target to be fitted are fitted to each other and a tip portion that protrudes from the base portion toward a center of the seal portion, and the through-hole is formed in the tip portion. 
     According to still another aspect of the present invention, in the connector, it is preferable that the other member includes a second through-hole that penetrates the other member along the direction in which the fitting portion and the target to be fitted are fitted to each other, one end of the second through-hole being the opening portion, and the projection portion is inserted into the second through-hole. 
     According to still another aspect of the present invention, in the connector, it is preferable that the first member is a housing that holds the terminal, and the second member is a holder that is fitted to the cylindrical portion. 
     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 THE DRAWINGS 
         FIG. 1  is a perspective view of a connector and a male connector according to an embodiment; 
         FIG. 2  is an exploded perspective view of the connector according to the embodiment; 
         FIG. 3  is a side view of a housing according to the embodiment; 
         FIG. 4  is a side view of a first packing according to the embodiment; 
         FIG. 5  is a view for describing a procedure for assembling the first packing in the embodiment; 
         FIG. 6  is a plan view of the connector in which the first packing and a front holder are assembled; 
         FIG. 7  is a cross-sectional view of the connector in which the first packing and the front holder are assembled; and 
         FIG. 8  is a view for describing fitting of the male connector to the connector of the embodiment. 
     
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Hereinafter, a connector 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 this embodiment. In addition, components in the following embodiment include components that can be easily assumed by those skilled in the art or components that are substantially the same as each other. 
     Embodiment 
     An embodiment will be described with reference to  FIGS. 1 to 8 . The present embodiment relates to a connector.  FIG. 1  is a perspective view of a connector and a male connector according to an embodiment,  FIG. 2  is an exploded perspective view of the connector according to the embodiment,  FIG. 3  is a side view of a housing according to the embodiment,  FIG. 4  is a side view of a first packing according to the embodiment,  FIG. 5  is a view for describing a procedure for assembling the first packing in the embodiment,  FIG. 6  is a plan view of the connector in which the first packing and a front holder are assembled,  FIG. 7  is a cross-sectional view of the connector in which the first packing and the front holder are assembled, and  FIG. 8  is a view for describing fitting of the male connector to the connector of the embodiment. 
     As illustrated in  FIG. 1 , a connector  1  according to the present embodiment is a female connector having female terminals  6 . The connector  1  is fitted to a male connector  100  that is a target to be fitted. The female terminals  6  are electrically connected to male terminals of the male connector  100  by fitting the connector  1  to the male connector  100 . In the present specification, a direction in which the connector  1  and the male connector  100  are fitted to each other is referred to as a “first direction X”. 
     As illustrated in  FIGS. 1 and 2 , the connector  1  includes a first fitting portion  2 , a second fitting portion  3 , a first packing  4 , a second packing  5 , and the female terminals  6 . The first fitting portion  2  is a fitting portion that is fitted to a housing  101  of the male connector  100 . The second fitting portion  3  is a fitting portion that is fitted to a housing of a device such as an inverter. In the following description, a target device to which the connector  1  is to be fixed is simply referred to as “a fixing target device”. The connector  1  of the present embodiment is fitted to a case of the fixing target device and is fixed to the case. The male connector  100  is connected to the connector  1  fixed to the fixing target device. The male connector  100  is connected to, for example, a power supply. In this case, power output from the power supply is supplied to the fixing target device through the male connector  100  and the connector  1 . 
     As illustrated in  FIGS. 1 and 2 , the first fitting portion  2  includes a housing  7  and a front holder  8 . The housing  7  and the front holder  8  are molded from, for example, an insulating synthetic resin. The housing  7  includes a body portion  71 , a first cylindrical portion  72 , a second cylindrical portion  73 , terminal covers  74 , and attaching portions  75 . The body portion  71  includes a cylindrical outer shell portion  71   a  and a wall portion  71   b . An axial direction of the outer shell portion  71   a  matches the first direction X. The wall portion  71   b  is formed integrally with the outer shell portion  71   a . The wall portion  71   b  is a partition wall-like component that partitions an internal space of the outer shell portion  71   a.    
     The first cylindrical portion  72  is a cylindrical component. The first cylindrical portion  72  protrudes from the body portion  71  along the first direction X. A cross-sectional shape of the first cylindrical portion  72  is a substantially rectangular shape. More specifically, the cross-sectional shape of the first cylindrical portion  72  is a shape in which each side of a rectangle is curved outward and four corners of the rectangle are formed in an arc shape. 
     The first cylindrical portion  72  includes projection portions  76 . The projection portion  76  is a convex component provided at an edge portion  72   a  of a tip of the first cylindrical portion  72 . The projection portion  76  protrudes along the first direction X as compared with an adjacent portion in the edge portion  72   a . The first cylindrical portion  72  of the present embodiment includes two projection portions  76 . The projection portions  76  are arranged on long side portions of the first cylindrical portion  72 . More specifically, the projection portions  76  are arranged at central portions of the long side portions of the first cylindrical portion  72 . 
     In the following description, a long side direction of the first cylindrical portion  72  is referred to as a “second direction Y”, and a short side direction of the first cylindrical portion  72  is referred to as a “third direction Z”. The second direction Y and the third direction Z are orthogonal to each other, and are each orthogonal to the first direction X. A long side direction of a second cylindrical portion  73  to be described later is the second direction Y, and a short side direction of the second cylindrical portion  73  is the third direction Z. 
     The two projection portions  76  face each other in the third direction Z. The edge portion  72   a  is provided with notches  72   b  adjacent to both sides of the projection portion  76 . As illustrated in  FIG. 3 , a tip  76   a  of the projection portion  76  protrudes further than a portion other than the projection portion  76  in the edge portion  72   a  along the first direction X. A shape of the projection portion  76  of the present embodiment is a plate shape. A cross-sectional shape of the projection portion  76  in a cross section orthogonal to the first direction X is a substantially rectangular shape, and is slightly curved outward in the third direction Z. The tip  76   a  of the projection portion  76  is flat. 
     The second cylindrical portion  73  is a cylindrical component. The second cylindrical portion  73  protrudes from the body portion  71  along the first direction X. A protruding direction of the second cylindrical portion  73  is opposite to a protruding direction of the first cylindrical portion  72 . A cross-sectional shape of the second cylindrical portion  73  is similar to a cross-sectional shape of the first cylindrical portion  72 . 
     The second cylindrical portion  73  includes projection portions  77 . The projection portion  77  is a convex component provided at an edge portion  73   a  of a tip of the second cylindrical portion  73 . The second cylindrical portion  73  includes two projection portions  77 . The projection portions  77  are arranged on long sides of the second cylindrical portion  73 . More specifically, the projection portions  77  are arranged at central portions of the long sides of the second cylindrical portion  73 . 
     The two projection portions  77  face each other in the third direction Z. The edge portion  73   a  is provided with notches  73   b  (see  FIG. 5 ) on both sides of the projection portion  77 . As illustrated in  FIG. 3 , a tip  77   a  of the projection portion  77  protrudes further than a portion other than the projection portion  77  in the edge portion  73   a  along the first direction X. 
     The terminal cover  74  protrudes from the wall portion  71   b  of the body portion  71  along the first direction X. A protruding direction of the terminal cover  74  is the same as that of the first cylindrical portion  72 . The terminal cover  74  covers the female terminal  6  to prevent a worker&#39;s finger or a tool from erroneously coming into contact with the female terminal  6 . The connector  1  of the present embodiment includes two terminal covers  74 . The two terminal covers  74  are arranged along the second direction Y. 
     The attaching portion  75  is a portion fixed to the fixing target device. The attaching portion  75  protrudes from the outer shell portion  71   a  in a direction orthogonal to the first direction X. The housing  7  of the present embodiment includes four attaching portions  75 . The attaching portions  75  are arranged at four corners of the outer shell portion  71   a , respectively. The attaching portion  75  includes a hole  75   a  into which a fastening member such as a screw is inserted. The attaching portion  75  is fixed to the housing of the fixing target device by the fastening member inserted into the hole  75   a.    
     The front holder  8  is a member attached to the first cylindrical portion  72  of the housing  7 . As illustrated in  FIG. 2 , the front holder  8  includes a body portion  81 , a columnar portion  82 , and engaging portions  83 . The body portion  81 , the columnar portion  82 , and the engaging portions  83  are formed integrally with one another. The body portion  81  is an annular component. A shape of the body portion  81  when viewed from the first direction X corresponds to the cross-sectional shape of the first cylindrical portion  72 . A shape of an outer edge of the body portion  81  is a shape in which each side of a rectangle is curved outward and four corners of the rectangle are formed in an arc shape. An outer edge portion of the body portion  81  abuts the edge portion  72   a  of the first cylindrical portion  72 . 
     The body portion  81  includes a cylindrical portion  81   a  fitted to the first cylindrical portion  72 . The cylindrical portion  81   a  is arranged at the outer edge portion of the body portion  81 , and protrudes along the first direction X. A cross-sectional shape of the cylindrical portion  81   a  corresponds to that of the first cylindrical portion  72 . The cylindrical portion  81   a  is fitted to the first cylindrical portion  72  so that an outer peripheral surface of the cylindrical portion  81   a  and an inner peripheral surface of the first cylindrical portion  72  face each other. The columnar portion  82  is a rod-shaped or plate-shaped component extending along the third direction Z. The columnar portion  82  connects long sides of the body portion  81  to each other. 
     The engaging portion  83  fixes the front holder  8  to the housing  7  by engaging with an engaging portion provided in the housing  7 . The engaging portion  83  protrudes from a facing surface of the body portion  81  along the first direction X. The facing surface of the body portion  81  is a surface facing the edge portion  72   a  of the first cylindrical portion  72 . The engaging portions  83  are arranged on long side portions and short side portions of the body portion  81 , respectively. The engaging portion  83  includes a hole  83   a . The hole  83   a  engages with a projection provided on an inner surface of the housing  7 , and is locked by the projection. 
     The body portion  81  includes two second through-holes  84 . The second through-holes  84  are arranged on long side portions of the body portion  81 , respectively. The second through-holes  84  penetrates the body portion  81  along the first direction X. The second through-holes  84  are arranged at positions corresponding to the projection portions  76  of the housing  7 . A shape of the second through-hole  84  when viewed from the first direction X is a substantially rectangular shape in which the second direction Y is a longitudinal direction. A width of the second through-hole  84  in the second direction Y and a width of the second through-hole  84  in the third direction Z are slightly larger than a width and a thickness of the projection portion  76 , respectively. That is, the second through-hole  84  is formed so that there is a slight gap between the second through-hole  84  and the projection portion  76  when the projection portion  76  is inserted into the second through-hole  84 . 
     The first packing  4  is a waterproof member formed of a resin such as rubber. The first packing  4  includes a seal portion  41  and piece portions  42 . The seal portion  41  and the piece portions  42  are formed integrally with each other. The seal portion  41  is formed in an annular shape, and is mounted on an outer surface of the first cylindrical portion  72 . A shape of the seal portion  41  when viewed from the first direction X corresponds to the cross-sectional shape of the first cylindrical portion  72 . The seal portion  41  seals a space between the housing  101  of the male connector  100  and the first cylindrical portion  72 . 
     The piece portion  42  protrudes from the seal portion  41 , and includes a through-hole  45 . The first packing  4  of the present embodiment includes two piece portions  42 . The piece portions  42  are arranged on long side portions of the seal portion  41 , respectively. More specifically, the piece portions  42  are arranged at central portions of the long side portions of the seal portion  41 . The two piece portions  42  face each other in the third direction Z. 
     The piece portion  42  includes a base portion  43  and a tip portion  44 . The base portion  43  protrudes from the seal portion  41  along the first direction X. The base portion  43  is formed in a plate shape. A protruding direction of the base portion  43  is a direction toward the male connector  100  that is the target to be fitted. The base portion  43  protrudes from a first side surface  41   a  of the seal portion  41 . The first side surface  41   a  is a side surface facing the male connector  100 , of two side surfaces of the seal portion  41 . In other words, the first side surface  41   a  is a side surface facing the body portion  81  of the front holder  8 , of the two side surfaces of the seal portion  41 . 
     The tip portion  44  protrudes from a tip of the base portion  43  toward the center of the seal portion  41  along the third direction Z. In other words, the tip portion  44  protrudes from the base portion  43  toward a space portion surrounded by the seal portion  41 . The tip portion  44  is formed in a plate shape. The tip portion  44  of the present embodiment protrudes in a direction orthogonal to the base portion  43 . Therefore, two tip portions  44  protrude so that tip surfaces of the tip portions  44  face each other in the third direction Z. 
     The through-hole  45  penetrates the piece portion  42 . The through-hole  45  of the present embodiment penetrates the base portion  43  and the tip portion  44 . That is, the through-hole  45  continuous from the base portion  43  to the tip portion  44  is formed in the piece portion  42 . A shape of a portion of the through-hole  45  formed at the tip portion  44  corresponds to the cross-sectional shape of the projection portion  76 . A shape of the through-hole  45  when viewed from the first direction X is a substantially rectangular shape in which the second direction Y is a longitudinal direction. The through-hole  45  is formed so that there is a slight gap between the through-hole  45  and the projection portion  76  when the projection portion  76  is inserted into the through-hole  45 . 
     A rear holder  9  is a member attached to the second cylindrical portion  73  of the housing  7 . The rear holder  9  is molded from, for example, an insulating synthetic resin. The second fitting portion  3  includes the housing  7  and the rear holder  9 . As illustrated in  FIG. 2 , the rear holder  9  includes a body portion  91  and a cylindrical portion  92 . The body portion  91  and the cylindrical portion  92  are formed integrally with each other. The body portion  91  is an annular component. A shape of the body portion  91  when viewed from the first direction X corresponds to the cross-sectional shape of the second cylindrical portion  73 . A shape of an outer edge of the body portion  91  is a shape in which each side of a rectangle is curved outward and four corners of the rectangle are formed in an arc shape. The body portion  91  abuts the edge portion  73   a  of the second cylindrical portion  73 . 
     The cylindrical portion  92  protrudes from an outer edge portion of the body portion  91  along the first direction X. The cylindrical portion  92  is a cylindrical component, and is fitted to the second cylindrical portion  73  of the housing  7 . A cross-sectional shape of the cylindrical portion  92  corresponds to that of the second cylindrical portion  73 . The cylindrical portion  92  is fitted to the second cylindrical portion  73  so that an inner peripheral surface of the cylindrical portion  92  and an outer peripheral surface of the second cylindrical portion  73  face each other. That is, the cylindrical portion  92  covers a tip portion of the second cylindrical portion  73  from outside. 
     The body portion  91  includes two second through-holes  93 . The second through-holes  93  are arranged on long side portions of the body portion  91 , respectively. The second through-holes  93  penetrate the body portion  91  along the first direction X. The second through-holes  93  are arranged at positions corresponding to the projection portions  77  of the housing  7 . A shape of the second through-hole  93  when viewed from the first direction X is a substantially rectangular shape in which the second direction Y is a longitudinal direction. A width of the second through-hole  93  in the second direction Y and a width of the second through-hole  93  in the third direction Z are slightly larger than a width and a thickness of the projection portion  77 , respectively. That is, the second through-hole  93  is formed so that there is a slight gap between the second through-hole  93  and the projection portion  77  when the projection portion  77  is inserted into the second through-hole  93 . 
     The second packing  5  is a waterproof member formed of a resin such as rubber. The second packing  5  includes a seal portion  51  and piece portions  52 . The seal portion  51  and the piece portions  52  are formed integrally with each other. The seal portion  51  is formed in an annular shape, and is mounted on an outer surface of the second cylindrical portion  73 . A shape of the seal portion  51  when viewed from the first direction X corresponds to the cross-sectional shape of the second cylindrical portion  73 . The seal portion  51  seals a space between the housing of the fixing target device and the second cylindrical portion  73 . 
     The piece portion  52  protrudes from the seal portion  51 , and includes a through-hole  55 . The second packing  5  of the present embodiment includes two piece portions  52 . The piece portions  52  are arranged on long side portions of the seal portion  51 , respectively. More specifically, the piece portions  52  are arranged at central portions of the long side portions of the seal portion  51 . The two piece portions  52  face each other in the third direction Z. 
     The piece portion  52  includes a base portion  53  and a tip portion  54 . The base portion  53  protrudes from the seal portion  51  along the first direction X. A protruding direction of the base portion  53  is a direction toward the case of the fitting target device. The base portion  53  protrudes from a first side surface  51   a  of the seal portion  51 . The first side surface  51   a  is a side surface facing the case of the fitting target device, of two side surfaces of the seal portion  51 . In other words, the first side surface  51   a  is a side surface facing the body portion  91  of the rear holder  9 , of the two side surfaces of the seal portion  51 . 
     The tip portion  54  protrudes from a tip of the base portion  53  toward the center of the seal portion  51  along the third direction Z. In other words, the tip portion  54  protrudes from the base portion  53  toward a space portion surrounded by the seal portion  51 . The tip portion  54  of the present embodiment protrudes in a direction orthogonal to the base portion  53 . Therefore, two tip portions  54  protrude so that tip surfaces of the tip portions  54  face each other in the third direction Z. 
     The through-hole  55  penetrates the piece portion  52 . The through-hole  55  of the present embodiment penetrates the tip portion  54 . A shape of the through-hole  55  corresponds to the cross-sectional shape of the projection portion  77 . A shape of the through-hole  55  when viewed from the first direction X is a substantially rectangular shape in which the second direction Y is a longitudinal direction. The through-hole  55  is formed so that there is a slight gap between the through-hole  55  and the projection portion  77  when the projection portion  77  is inserted into the through-hole  55 . 
     A procedure for assembling the first packing  4  in the embodiment will be described with reference to  FIGS. 5  and  6 . First, the first packing  4  is attached to the housing  7 , as illustrated in  FIG. 5 . The seal portion  41  of the first packing  4  is mounted on an outer peripheral surface of the first cylindrical portion  72 . The first packing  4  is mounted on the first cylindrical portion  72  in a posture where the piece portion  42  is directed to an opposite side to the body portion  71  of the housing  7 . Therefore, in the first packing  4  mounted on the first cylindrical portion  72 , the piece portion  42  protrudes from the seal portion  41  toward a tip side of the first cylindrical portion  72 . 
     The projection portion  76  of the first cylindrical portion  72  is inserted into the through-hole  45  of the piece portion  42 , and protrudes from the through-hole  45  along the first direction X. When viewed from the body portion  71 , the tip  76   a  of the projection portion  76  is located farther in the first direction X than the piece portion  42 . The tip portion  44  of the piece portion  42  enters the notch  72   b  of the first cylindrical portion  72 , and is accommodated in the notch  72   b . A depth of the notch  72   b  is greater than a thickness of the tip portion  44 . Therefore, it is difficult for the piece portion  42  to interfere with other members, and damage to the piece portion  42  is thus suppressed. 
     In the second direction Y, a slight gap may be generated between the projection portion  76  and the piece portion  42 . A size of the gap is, for example, a degree generated by a dimensional tolerance of the projection portion  76  or the through-hole  45 . Therefore, the projection portion  76  can accurately position the first packing  4  in the second direction Y. In addition, in a case where the first packing  4  attempts to rotate relatively with respect to the first cylindrical portion  72 , the projection portion  76  and the notch  72   b  lock the piece portion  42 . Therefore, the projection portion  76  and the notch  72   b  can restrict the relative rotation of the first packing  4  with respect to the first cylindrical portion  72 . 
     After the first packing  4  is mounted on the first cylindrical portion  72 , the front holder  8  is attached to the housing  7 . The front holder  8  is attached to the housing  7  in a posture where the engaging portion  83  is directed to the housing  7 . When the front holder  8  is inserted deeply into the first cylindrical portion  72 , the engaging portion  83  of the front holder  8  is locked by the housing  7 . Thus, the front holder  8  is fixed to the housing  7 . In addition, when the front holder  8  is inserted into the first cylindrical portion  72 , the projection portion  76  of the first cylindrical portion  72  is inserted into the second through-hole  84  of the front holder  8 . 
     As illustrated in  FIG. 5 , the second through-hole  84  has an opening portion  84   a . The opening portion  84   a  is an opening portion opened toward a protruding direction of the cylindrical portion  81   a , of two opening portions of the second through-hole  84 . The projection portion  76  is inserted from the opening portion  84   a  into the second through-hole  84 . In a state where the front holder  8  is fixed to the housing  7 , the tip  76   a  of the projection portion  76  may be located inside the second through-hole  84 , or may protrude from the second through-hole  84 . The connector  1  of the present embodiment is configured so that the tip  76   a  of the projection portion  76  protrudes from the second through-hole  84 . 
     The second through-hole  84  holds a portion of the projection portion  76  inserted into the second through-hole  84 . A size of the gap between the second through-hole  84  and the projection portion  76  is determined so that the piece portion  42  of the first packing  4  cannot pass through this gap. Therefore, the projection portion  76  is inserted into the second through-hole  84  to restrict the piece portion  42  from being detached from the projection portion  76 . 
     As illustrated in  FIG. 5 , the cylindrical portion  81   a  of the front holder  8  includes a notch  81   b . The notch  81   b  is formed at a position corresponding to the piece portion  42  in the cylindrical portion  81   a . In the second direction Y, a width Wdz of the notch  81   b  is slightly larger than a width Wd 1  of the piece portion  42 . A protruding height of the cylindrical portion  81   a  is substantially zero at a portion of the notch  81   b . That is, the cylindrical portion  81   a  is divided into two parts by the notch  81   b.    
     As illustrated in  FIG. 6 , when the front holder  8  is fixed to the housing  7 , a part of the piece portion  42  is accommodated in the notch  81   b . The notch  81   b  faces a side surface of the piece portion  42  in the second direction Y. The body portion  81  of the front holder  8  covers the piece portion  42 , and protects the piece portion  42 . For example, when the connector  1  is fitted to the male connector  100 , the body portion  81  protects the piece portion  42  so that the piece portion  42  does not interfere with the male connector  100 . 
       FIG. 7  illustrates a cross section taken along line VII-VII of  FIG. 6 . The projection portion  76  of the housing  7  is inserted through the through-hole  45  of the first packing  4 , and is further inserted through the second through-hole  84  of the front holder  8 . The tip  76   a  of the projection portion  76  protrudes from the through-hole  45 , such that a hooking margin of the projection portion  76  to the piece portion  42  is increased. Therefore, it is difficult for the piece portion  42  to be detached from the projection portion  76 . Further, the projection portion  76  is inserted into the opening portion  84   a  of the second through-hole  84 , such that the detachment of the piece portion  42  from the projection portion  76  is effectively suppressed. 
     In addition, the body portion  81  of the front holder  8  is close to the piece portion  42  in the first direction X. More specifically, the body portion  81  is located in the vicinity of the tip portion  44  of the piece portion  42  in the first direction X, and faces the tip portion  44 . Therefore, the body portion  81  restricts the first packing  4  from being moved relatively with respect to the first cylindrical portion  72  in the first direction X. The body portion  81  restricts displacement of the first packing  4  to suppress deterioration of water cut-off performance of the first packing  4 . 
     In addition, the housing  7  and the front holder  8  can suppress turn-up or floating of the first packing  4 , as described below.  FIG. 8  illustrates the male connector  100  fitted to the connector  1 . The housing  101  of the male connector  100  is fitted to the connector  1  while relatively moving along the first direction X with respect to the connector  1 . The housing  101  includes a cylindrical portion  102  fitted to the first cylindrical portion  72  of the connector  1 . A cross-sectional shape of the cylindrical portion  102  corresponds to that of the first cylindrical portion  72 . The cylindrical portion  102  is fitted to the first cylindrical portion  72  while accommodating the first cylindrical portion  72  therein. The seal portion  41  of the first packing  4  is sandwiched between the outer surface of the first cylindrical portion  72  and an inner surface of the cylindrical portion  102  to seal a space between the outer surface of the first cylindrical portion  72  and the inner surface of the cylindrical portion  102 . 
     When the cylindrical portion  102  is fitted to the first cylindrical portion  72 , a force F 1  illustrated in  FIG. 8  acts on the seal portion  41 . The force F 1  is a force in a direction in which the seal portion  41  is separated from the outer surface of the first cylindrical portion  72 . In a case where the force F 1  acts on the seal portion  41 , the projection portion  76  locks the tip portion  44  of the first packing  4  to suppress floating or turn-up of the seal portion  41 . The piece portion  42  of the present embodiment protrudes from the seal portion  41  toward the male connector  100  in the first direction X. Therefore, when the force F 1  acts, the piece portion  42  attempts to move in a direction indicated by an arrow Y 1 . The projection portion  76  restricts the movement of the piece portion  42  toward the arrow Y 1 , and resultantly suppresses the floating or the turn-up of the seal portion  41 . 
     As described above, in the connector  1  of the present embodiment, the relative rotation of the first packing  4  with respect to the first cylindrical portion  72 , and the floating or the turn-up of the seal portion  41  are suppressed. Therefore, in the connector  1  of the present embodiment, it is possible to suppress the deterioration of the water cut-off performance of the first packing  4 . 
     A procedure for assembling the second packing  5  is similar to the procedure for assembling the first packing  4 . That is, the second packing  5  is attached to the second cylindrical portion  73  of the housing  7 , and the rear holder  9  is then attached to the second cylindrical portion  73 . As illustrated in  FIG. 2 , the seal portion  51  of the second packing  5  is mounted on the second cylindrical portion  73  in a posture where the piece portion  52  is directed to an opposite side to the body portion  71  of the housing  7 . In this case, the projection portion  77  of the second cylindrical portion  73  is inserted into the through-hole  55  of the piece portion  52 . 
     When the rear holder  9  is attached to the second cylindrical portion  73 , the projection portion  77  is inserted into the second through-hole  93  of the rear holder  9 . The rear holder  9  may be fixed directly to the housing  7  or may be fixed to the housing  7  through another member. The projection portion  77  and the rear holder  9  can restrict relative rotation of the second packing  5  with respect to the second cylindrical portion  73 , and can suppress floating and turn-up of the seal portion  51 . 
     As described above, the connector  1  according to the present embodiment includes the packing (the first packing  4  and the second packing  5 ) and the fitting portion (the first fitting portion  2  and the second fitting portion  3 ). An example of a water cut-off structure by a combination of the first packing  4  and the first fitting portion  2  will be described in detail. The first packing  4  includes the seal portion  41  having the annular shape and the piece portion  42  protruding from the seal portion  41  and including the through-hole  45 . The first fitting portion  2  holds the female terminals  6  therein, and is mounted with the first packing  4 . The first fitting portion  2  is fitted to the male connector  100  so that a space between the first fitting portion  2  and the male connector  100  is sealed by the first packing  4 . 
     The first fitting portion  2  includes the housing  7  as a first member, the front holder  8  as a second member, the projection portions  76 , and the opening portions  84   a . The housing  7  includes the first cylindrical portion  72 , and the seal portion  41  is mounted on the outer surface of the first cylindrical portion  72 . The front holder  8  is a member attached to the first cylindrical portion  72 . The projection portion  76  is provided in the housing  7 , is inserted into the through-hole  45 , and includes the tip  76   a  protruding from the through-hole  45 . The opening portion  84   a  is provided in the front holder  8 , and the tip  76   a  of the projection portion  76  is inserted into the opening portion  84   a.    
     According to the configuration of the connector  1  described above, the tip  76   a  of the projection portion  76  protrudes from the through-hole  45  and is inserted into the opening portion  84   a , such that the detachment of the piece portion  42  of the projection portion  76  is suppressed. Therefore, detachment of the first packing  4  from the first cylindrical portion  72  is suppressed. In addition, the projection portion  76  is inserted into the through-hole  45 , such that displacement of the first packing  4  with respect to the first cylindrical portion  72  is suppressed. For example, the relative rotation of the first packing  4  with respect to the first cylindrical portion  72  is restricted. 
     In the connector  1  of the present embodiment, the through-hole  45  is located closer to the male connector  100  than the seal portion  41  is, in the first direction X in which the first fitting portion  2  and the male connector  100  are fitted to each other. Therefore, the turn-up or detachment of the seal portion  41  when the first fitting portion  2  and the male connector  100  are fitted to each other is suitably suppressed. 
     The piece portion  42  of the present embodiment includes the base portion  43  and the tip portion  44 . The base portion  43  protrudes from the seal portion  41  along the first direction X. The tip portion  44  protrudes from the base portion  43  toward the center side of the seal portion  41 . The through-hole  45  is formed in the tip portion  44 . Therefore, the projection portion  76  can support the piece portion  42  to restrict the turn-up or the detachment of the seal portion  41 , in a case where a force in a direction orthogonal to the first direction X acts on the first packing  4 . 
     The front holder  8  of the present embodiment includes the second through-holes  84 . The second through-hole  84  penetrates the front holder  8  along the first direction X, and one end of the second through-hole  84  is the opening portion  84   a . Side surfaces of the projection portion  76  are covered with the second through-hole  84 , such that detachment of the first packing  4  from the projection portion  76  is suitably suppressed. In addition, the projection portion  76  inserted from the opening portion  84   a  can protrude from an opening portion on an opposite side of the second through-hole  84 . In this case, detachment of the first packing  4  from the projection portion  76  is more surely suppressed. 
     Modification of Embodiment 
     A modification of the embodiment will be described. In the above embodiment, in the first packing  4 , the piece portion  42  is provided on the long side portion of the seal portion  41 . However, in addition to or instead of this, the piece portion  42  may be provided on a short side portion of the seal portion  41 . The piece portion  42  is arranged, for example, at the center of the short side portion. The same applies to the second packing  5 , and the piece portion  52  may be provided on a short side portion of the seal portion  51 . 
     In the front holder  8 , a portion into which the projection portion  76  is inserted may not penetrate the front holder  8 . That is, the portion into which the projection portion  76  is inserted may be a recess portion instead of the second through-hole  84 . One end of the recess portion is opened toward the housing  7  in the opening portion  84   a . The other end of the recess portion is closed or is narrowed so that the projection portion  76  cannot pass therethrough. The same applies to the rear holder  9 , and a recess portion into which the projection portion  77  is inserted may be provided instead of the second through-hole  93 . 
     The shapes of the projection portions  76  and  77  are not limited to the illustrated shapes. The shapes of the projection portions  76  and  77  may be, for example, rod shapes or cylindrical shapes. The cross-sectional shapes of the projection portions  76  and  77  in a case where the shapes of the projection portions  76  and  77  are the rod shapes may be polygonal shapes or circular shapes. It is preferable that shapes of the opening portions provided in the front holder  8  or the rear holder  9  are shapes corresponding to the cross-sectional shapes of the projection portions  76  and  77 . For example, in a case where the cross-sectional shape of the projection portion  76  is a circular shape, it is preferable that the shape of the opening portion  84   a  is a circular shape. 
     The projection portion  76  may be provided with a lock structure. For example, the front holder  8  may be provided with an engagement protrusion, and the projection portion  76  may be provided with an engagement recess portion engaging with the engagement protrusion. Conversely, the projection portion  76  may be provided with an engagement projection, and the front holder  8  may be provided with an engagement recess portion. The projection portion  76  is provided with the lock structure, such that components can be simplified. For example, in the front holder  8 , the engaging portions  83  can be omitted. 
     Shapes or arrangements of the piece portions  42  and  52  are not limited to the exemplified shapes or arrangements. For example, protruding directions of the piece portions  42  and  52  may be opposite to the illustrated directions. That is, the piece portions  42  and  52  may protrude from the seal portions  41  and  51  toward the body portion  71  of the housing  7 , respectively. 
     The seal portion  41  of the first packing  4  may be mounted on the front holder  8 , instead of being mounted on the first cylindrical portion  72 . In this case, the front holder  8  is provided with a cylindrical portion on which the seal portion  41  can be mounted. The first packing  4  may be fixed to the front holder  8  in advance. As an example, the first packing  4  may be formed on the front holder  8  by two-color molding. The seal portion  51  of the second packing  5  may be mounted on the rear holder  9 , instead of being mounted on the second cylindrical portion  73 . In this case, the rear holder  9  is provided with a cylindrical portion on which the seal portion  51  can be mounted. The second packing  5  may be fixed to the rear holder  9  in advance by two-color molding or the like. 
     Contrary to the above embodiment, the front holder  8  may be provided with a projection portion, and the housing  7  may be provided with an opening portion. In this case, the projection portion of the front holder  8  is inserted into the through-hole  45  of the first packing  4 , and a tip of the projection portion is inserted into the opening portion of the housing  7 . The opening portion of the housing  7  may be one end of a recess portion extending along the first direction X or may be one end of a through-hole penetrating the housing  7  along the first direction X. 
     The contents disclosed in the above embodiment and modification can be executed in appropriate combination. 
     The connector according to the embodiment includes the packing that includes the seal portion having the annular shape and the piece portion protruding from the seal portion and having the through-hole, and the fitting portion that holds the terminal, is mounted with the packing, and is fitted to the target to be fitted so that the space between the fitting portion and the target to be fitted is sealed by the packing. The fitting portion includes the first member that includes the cylindrical portion having the outer surface on which the seal portion is mounted, the second member that is attached to the cylindrical portion, the projection portion that is provided in one member of the first member and the second member, is inserted into the through-hole, and includes the tip projecting from the through-hole, and the opening portion that is provided in the other member of the first member and the second member and into which the tip of the projection portion is inserted. 
     According to the connector of the embodiment, the projection portion provided in one member is inserted into the through-hole of the packing, and the tip of the projection portion is inserted into the opening portion of the other member. Therefore, displacement of the packing is suppressed by the projection portion. In addition, since the tip of the projection portion is inserted into the opening portion of the other member, the piece portion of the packing is not easily detached from the projection portion. Therefore, the connector according to the embodiment has an effect that the detachment of the packing can be more surely suppressed. 
     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.