Crimp terminal and terminal crimping device

1. A crimp terminal comprising:

a terminal connecting portion electrically connected to a counterpart terminal;

an electric wire connecting portion electrically connected to an end of an electric wire placed on an inner wall surface side by crimping process performed with the electric wire connecting portion sandwiched between a first die and a second die; and

a coupling portion that couples the terminal connecting portion and the electric wire connecting portion, wherein

the electric wire connecting portion is divided into a bottom placed on a recessed surface of the first die and on which the end of the electric wire is placed during the crimping process, a first barrel piece extending from a first end of the bottom and wound around the end of the electric wire, and a second barrel piece extending from a second end of the bottom and wound around the end of the electric wire, and

the bottom has, in an area on which a core wire at a distal end of the electric wire is placed, a recess formed on an outer wall surface on the recessed surface side and into which a protrusion formed on the recessed surface is inserted during the crimping process, and a protrusion on the inner wall surface formed along with formation of the recess.

2. The crimp terminal according to claim 1 , wherein

the recess and the protrusion on the bottom and the protrusion on the recessed surface are formed into respective shapes such that the protrusion on the bottom protrudes from the inner wall surface of the bottom even when the core wire compresses the protrusion on the bottom during the crimping process.

3. The crimp terminal according to claim 1 , wherein

a size of an internal space of the recess is smaller than a size of the protrusion on the recessed surface so that the protrusion on the recessed surface is capable of being thrusted into the recess during the crimping process, to push out the protrusion on the bottom toward the core wire side.

4. The crimp terminal according to claim 2 , wherein

a size of an internal space of the recess is smaller than a size of the protrusion on the recessed surface so that the protrusion on the recessed surface is capable of being thrusted into the recess during the crimping process, to push out the protrusion on the bottom toward the core wire side.

5. The crimp terminal according to claim 1 , wherein

the recess and the protrusion on the bottom are formed in a core wire holding area on which the core wire is held when the core wire holding area is formed on the inner wall surface of the bottom.

6. The crimp terminal according to claim 2 , wherein

the recess and the protrusion on the bottom are formed in a core wire holding area on which the core wire is held when the core wire holding area is formed on the inner wall surface of the bottom.

7. The crimp terminal according to claim 3 , wherein

the recess and the protrusion on the bottom are formed in a core wire holding area on which the core wire is held when the core wire holding area is formed on the inner wall surface of the bottom.

8. A terminal crimping device comprising:

a terminal supplying device that transfers a crimp terminal to a crimping position at which the crimp terminal is crimped to an electric wire;

a crimping device that crimps the crimp terminal transferred to the crimping position to an end of the electric wire using a first die and a second die; and

a driving device that reduces a gap between the first die and the second die during crimping process and increases the gap between the first die and the second die after the crimping process is completed, wherein

the crimp terminal includes a terminal connecting portion electrically connected to a counterpart terminal, an electric wire connecting portion electrically connected to the end of the electric wire placed on an inner wall surface side by the crimping process, and a coupling portion that couples the terminal connecting portion and the electric wire connecting portion,

the electric wire connecting portion is divided into a bottom placed on a recessed surface of the first die and on which the end of the electric wire is placed during the crimping process, a first barrel piece extending from a first end of the bottom and wound around the end of the electric wire, and a second barrel piece extending from a second end of the bottom and wound around the end of the electric wire, and

the bottom has, in an area on which a core wire at a distal end of the electric wire is placed, a recess formed on an outer wall surface on the recessed surface side and into which a protrusion formed on the recessed surface is inserted during the crimping process, and a protrusion on the inner wall surface formed along with formation of the recess.

9. The terminal crimping device according to claim 8 , wherein

the recess and the protrusion on the bottom and the protrusion on the recessed surface are formed into respective shapes such that the protrusion on the bottom protrudes from the inner wall surface of the bottom even when the core wire compresses the protrusion on the bottom during the crimping process.

10. The terminal crimping device according to claim 8 , wherein

a size of the protrusion on the recessed surface is larger than a size of an internal space of the recess so that the protrusion on the recessed surface is capable of being thrusted into the recess during the crimping process, to push out the protrusion on the bottom toward the core wire side.

11. The terminal crimping device according to claim 9 , wherein

a size of the protrusion on the recessed surface is larger than a size of an internal space of the recess so that the protrusion on the recessed surface is capable of being thrusted into the recess during the crimping process, to push out the protrusion on the bottom toward the core wire side.