Abstract: A connection structure of an electric wire and a terminal is provided. The terminal includes a U-shaped base portion extending from a terminal body, a first barrel erected from a first edge of one of opposite side walls of the base portion to crimp and connect a front end portion of the core wire at an end portion of the electric wire, a second barrel erected from a second edge of another of the side walls of the base portion to crimp and connect a rear end portion of the core wire. The first barrel and the second barrel are formed separately and independently, and offset from each other in an axial direction of the base portion. Further, the first barrel crimps and connects the front end portion of the core wire more strongly than crimping of the rear end portion of the core wire by the second barrel.

Abstract: A crimping terminal comprises: a conductor crimping portion including a bottom plate and a pair of conductor crimping tabs, the conductor crimping tabs being extending from both sides of the bottom plate in a widthwise direction perpendicular to a lengthwise direction of the crimping terminal and being configured to crimp a conductor of an electrical cable so as to wrap the conductor, the conductor being formed by a bundle of wires and serving as a crimping subject disposed on the bottom plate along the lengthwise direction, the inner surface of the conductor crimping portion being provided with serrations including a plurality of uniformly cylindrical recesses with a diameter smaller than the diameter of the wire of the conductor, and wherein, in the plurality of recesses, the adjacent recesses deviated from each other in the widthwise direction of the crimping terminal partly overlap each other when seen from the lengthwise direction.

Abstract: There is provided a method for manufacturing a terminal-equipped electric wire to which a terminal fitting is connected. The terminal fitting includes a core wire crimp portion crimped to a core wire of an electric wire, a coating fixing portion fixed to a coating of the electric wire, and a joint portion connecting the core wire crimp portion and the coating fixing portion. The method includes: applying a first resin to a core wire protrusion region located at an end portion of the core wire crimp portion; curing the first resin; applying a second resin to at least a joint region in which the core wire passes through the joint portion; allowing a penetration time to elapse until the second resin penetrates at least around the core wire and among strands constituting the core wire; and curing the second resin.

Abstract: A terminal-equipped electric wire includes: an electric wire including a core wire covered with a coating; and a terminal fitting connected to an end portion of the electric wire in which the core wire is exposed. The terminal fitting includes: a core wire crimp portion crimped to the core wire; a coating fixing portion surrounding the coating with a gap; and a joint portion provided between the core wire crimp portion and the coating fixing portion. The joint portion is sealed by a resin filled to surround an entire circumference of the core wire in the joint portion. The coating fixing portion is fixed to the coating by the resin filled in the joint portion and guided to the gap.

Abstract: A method for manufacturing a terminal-equipped electric wire includes a coating forming process for forming, on a terminal-equipped electric wire having a terminal including a core wire crimping part that holds a core wire of an electric wire and a covering crimping part crimped to a covering of the electric wire, a coating of an ultraviolet-curing resin that integrally covers the core wire and the terminal, and an irradiating process for irradiating the coating with ultraviolet rays. At the coating forming process, while a discharge port that intermittently ejects droplets of the ultraviolet-curing resin and the terminal-equipped electric wire are moved relative to each other, the coating is formed from the ultraviolet-curing resin ejected from the discharge port. A direction of the relative movement of the discharge port and the terminal-equipped electric wire at the coating forming process includes directions orthogonal to an ejection direction of the droplets.

Abstract: A method for manufacturing a terminal-equipped electric wire includes a coating forming process for forming, on a terminal-equipped electric wire having a terminal including a core wire crimping part that holds a core wire between tips of a pair of conductor crimping pieces connected to a bottom wall and the bottom wall and a covering crimping part crimped to a covering, a coating of an ultraviolet-curing resin that integrally covers the core wire and the terminal, and an irradiating process for irradiating the coating with ultraviolet rays. At the coating forming process, the terminal is maintained at an inclined attitude directed upward in a vertical direction from the covering crimping part toward the core wire crimping part in an axial direction, and the coating is formed from droplets of the ultraviolet-curing resin intermittently ejected from a discharge port on the terminal-equipped electric wire at the inclined attitude.

Abstract: A first contact part in which three or more first indent parts are projectingly provided on the same circumference and a second contact part in which one second indent part is projectingly provided, in a terminal insertion process, the first indent part of the first contact part slides on the second contact part and the second indent part of the second contact part slides on the first contact part, and at a terminal insertion completion position, the second indent part intrudes into a position surrounded by the three or more first indent parts and outer circumference surfaces of the first indent parts come into contact with outer circumference surfaces of the second indent part, respectively.

Abstract: A contacting section protrudes from the elastic piece, has a hemispherical shape, and includes a hollow portion and a contact portion. The hollow portion is located at a center of the contacting section, has a recess in a direction away from a connecting part of a counterpart terminal, and has no contact with a surface of the connecting part. The contact portion is located to sandwich the hollow portion in a plan view of the elastic piece and comes in contact with the surface of the connecting part. The hollow portion has a circular shape in the plan view of the elastic piece. The contact portion has an annular shape located on an outer periphery of the hollow portion in the plan view of the elastic piece.

Abstract: A contact connection structure includes: a first contact portion including an indent portion spherically protruding, the first contact portion including a plating layer formed on a surface of the first contact portion; and a second contact portion including a plating layer formed on a surface of the second contact portion. The indent portion of the first contact portion is slidable on a contact surface of the second contact portion. The indent portion of the first contact portion at a terminal insertion completed position is in contact with the second contact portion. The contact surface of the second contact portion includes an oxide-film shaving portion having an annular arc portion curved along a circumference portion of the indent portion.

Abstract: A contact connection structure includes: a first contact portion including an indent portion spherically protruding, the first contact portion including a plating layer formed on a surface of the first contact portion; and a second contact portion including a plating layer formed on a surface of the second contact portion. The indent portion of the first contact portion is slidable on a contact surface of the second contact portion. The indent portion of the first contact portion at a terminal insertion completed position is in contact with the second contact portion. The contact surface of the second contact portion includes an oxide-film shaving portion having an annular arc portion curved along a circumference portion of the indent portion.

Abstract: A first contact part in which three or more first indent parts are projectingly provided on the same circumference and a second contact part in which one second indent part is projectingly provided, in a terminal insertion process, the first indent part of the first contact part slides on the second contact part and the second indent part of the second contact part slides on the first contact part, and at a terminal insertion completion position, the second indent part intrudes into a position surrounded by the three or more first indent parts and outer circumference surfaces of the first indent parts come into contact with outer circumference surfaces of the second indent part, respectively.

Abstract: A contacting section protrudes from the elastic piece, has a hemispherical shape, and includes a hollow portion and a contact portion. The hollow portion is located at a center of the contacting section, has a recess in a direction away from a connecting part of a counterpart terminal, and has no contact with a surface of the connecting part. The contact portion is located to sandwich the hollow portion in a plan view of the elastic piece and comes in contact with the surface of the connecting part. The hollow portion has a circular shape in the plan view of the elastic piece. The contact portion has an annular shape located on an outer periphery of the hollow portion in the plan view of the elastic piece.

Abstract: A crimp terminal (10) includes a conductor crimp portion (12) having a cross section formed into a U-shape by a bottom plate (13) and a pair of conductor crimping pieces (14, 14) provided to extend on both sides of the bottom plate (13) and crimped to wrap a conductor (Wa) of an electric wire (W) disposed on an inner surface (13a) of the bottom plate (13). The conductor crimp portion (12) is crimped and connected to the conductor (Wa) and includes serrations (16) at respective lattice points of a lattice (21, 22, 23) assumed in an inner surface (13a, 14a) of the conductor crimp portion (12) and obliquely crossing in a longitudinal direction of the conductor (Wa). The serrations (16) are consisted of cylindrical recesses having the same shape.

Abstract: A crimping terminal includes a conductor crimping portion which is connected to an electric cable so as to crimp the electric cable. The conductor crimping portion includes a bottom plate on which a conductor is placed and a pair of conductor crimping tabs which is provided on both sides of the bottom plate. The conductor crimping portion includes serrations that are formed at least a part of the inner surface thereof and retains the conductor of the electric cable inside the conductor crimping portion and at least one bead that protrudes from the inner surface.

Abstract: Concave serrations are provided in an inner surface of a conductor crimping portion of a crimp terminal. A number of circular concave portions are provided in the inner surface of the conductor crimping portion as the concave serrations so as to be scattered in a state of being spaced aside from one another. A diameter of an inner bottom surface of each circular concave portion is set within a range of 0.15 (an error range is ±0.04) mm to 0.8 (the error range is ±0.04) mm. A serration angle between an extension surface of the inner bottom surface and an inner side surface of each circular concave portion is set within a range of 60 to 90 degrees. A shortest distance of a flat surface portion between peripheries of mutually adjacent circular concave portions is set to be 0.17 (the error range is ±0.09) mm.

Abstract: In a crimp terminal (1) with a conductor crimp portion (11) having recessed serrations in the inner surface (11R), circular recesses (20) as serrations are provided in an inner surface (11R) of the conductor crimp portion (11) to be scattered so as to be spaced from each other before the conductor crimp portion (11) is crimped to a conductor (Wa) of an electric wire (W). A strip-shaped serration non-forming region (22) is provided in an intermediate portion in a front-back direction of the conductor crimp portion (11) and formed without the recesses (20).

Abstract: There is provided a method of evaluating a clamping portion of an electric wire and a terminal, which can determine whether a clamping quality is good, or not, through simple test, and can easily test all of the clamping portions. The method of evaluating the clamping portion of an electric wire (W) and a terminal (10) includes measuring a length (L1) of the terminal (10) after clamping to detect an expansion of the terminal (10) after clamping to a length (L0) of the terminal (10) before clamping, determining that the clamping quality is “good” when the expansion falls within an allowable range between a given lower limit and a given upper limit, and determining that the clamping quality is “no good” when the expansion falls outside the allowable range.

Abstract: Disclosed is a crimp terminal (1) provided with a conductor crimp unit (3A) that has a base (4) and a swage unit (5), which extends from the sides of the base (4) and swages in such a manner that a conductor (20) on the base (4) is crimped. Circular serrations (10a, 10b) are multiply provided to the inner surface of the conductor crimp unit (3A). The serrations (10a, 10b) have different sizes according to region.

Abstract: A conductor crimp portion (11) before being crimped to a conductor (Wa) of an electric wire includes, in an inner surface (11R) of the conductor crimp portion (11), circular recesses (20) as serrations of the conductor crimp portion (11) scattered to be spaced from each other. The recesses (20) each has an inner bottom surface (20A) in a form of a hemispherical surface.

Abstract: A conductor crimp portion (11) before being crimped to a conductor (Wa) of an electric wire includes, in an inner surface (11R) of the conductor crimp portion (11), circular recesses (20) as serrations of the conductor crimp portion (11) scattered to be spaced from each other. At an inner periphery corner portion where an inner bottom surface (20A) and an inner periphery side surface (20B) of each of the recesses (20) intersect with each other, a roundness portion (20C) for connecting the inner bottom surface (20A) with the inner periphery side surface (20B) by a smooth continuous curved surface are provided.