Connection structure of terminal fitting and connection method of terminal fitting

1. A provisional engaging structure of a terminal fitting and a connection terminal, comprising:

the terminal fitting comprising:

a terminal body; and

a plurality of terminal connection sections extended from the terminal body; and

the connection terminal configured to be connected to an end section of an electric wire,

wherein the connection terminal has a holding space defined by a pair of fastening caulking pieces provided so as to stand upright on both side sections of the connection terminal and upper end sections of the pair of fastening caulking pieces which are folded back inwardly, the pair of fastening caulking pieces being capable of caulking and fastening the connection terminal to the terminal fitting;

wherein a pair of caulked pieces is provided so as to stand upright on both side sections of the terminal connection section and is configured to be accommodated in the holding space of the connection terminal; and

wherein a provisional engaging mechanism that is detachably engaged with the pair of fastening caulking pieces when the pair of caulked pieces is accommodated in the holding space is provided between the pair of caulked pieces and the pair of fastening caulking pieces.

2. The provisional engaging structure according to claim 1 , wherein the provisional engaging mechanism comprises:

engaging protruding sections respectively provided so as to protrude at tip end sections of the upper end sections of the pair of caulked pieces and so as to make contact with the electric wire-side side faces of the pair of fastening caulking pieces; and

relief sections respectively provided so as to be cut out at tip end sections of bottom section sides of the pair of caulked pieces to avoid interference with the connection terminal when the tip end section of the terminal connection section is inserted into the holding space obliquely.

3. The provisional engaging structure according to claim 1 , wherein the provisional engaging mechanism comprises a pair of engaging protruding sections provided so as to protrude at tip end sections of upper end sections of the pair of caulked pieces and so as to be respectively opposed to both side faces of the pair of fastening caulking pieces along a connection direction of the connection terminal.

4. The provisional engaging structure according to claim 1 , wherein the provisional engaging mechanism comprises an engaging protruding piece provided so that a tip end of the upper end section of one of the caulked piece is bent to outside of the tip end section thereof so as to make contact with only the electric wire-side side face of one of the pair of fastening caulking pieces.

5. A connection structure of a terminal fitting, wherein the pair of fastening caulking pieces of the connection terminal according to claim 1 is caulked to the pair of caulked pieces, and the connection terminal is caulked and fastened to the terminal fitting.

6. A provisional engaging method of a terminal fitting and a connection terminal in a connection of the terminal fitting having a terminal body and a plurality of terminal connection sections extended from the terminal body, a pair of fastening caulking pieces of the connection terminal connected to an end section of an electric wire caulking to a pair of caulked pieces provided on both side sections of the terminal connection section,

the provisional engaging method comprising:

forming a holding space capable configured to accommodate the pair of caulked pieces in the connection terminal by folding back inward upper end sections of the pair of fastening caulking pieces provided so as to stand upright on both side sections of the connection terminal; and

detachably engaging the pair of fastening caulking pieces with the pair of caulked pieces using a provisional engaging mechanism provided between the terminal connection section and the connection terminal by inserting the pair of caulked pieces into the holding space.

7. The provisional engaging method according to claim 6 , wherein the provisional engaging mechanism comprises engaging protruding sections provided so as to protrude at tip end sections of upper end sections of the pair of caulked pieces and so as to make contact with the electric wire-side side faces of the fastening caulking pieces; and

wherein the upper end section of one of the fastening caulking pieces is hooked to a base end section side portion of the upper end section of one of the pair of caulked pieces, and the connection terminal is rotated around an axis along an insertion direction of the terminal connection section by using the upper end section of the one of the pair of caulked pieces as a fulcrum, whereby the pair of caulked pieces is accommodated into the holding space.

8. The provisional engaging method according to claim 6 , wherein the provisional engaging mechanism comprises an engaging protruding piece provided so that a tip end of the upper end section of one of the caulked pieces is bent to outside of the tip end section thereof so as to make contact with only the electric wire-side side face of one of the pair of the fastening caulking pieces; and

wherein the tip end section of the terminal connection section is inserted into the holding space by passing the engaging protruding piece through a clearance between the pair of fastening caulking pieces, and then the connection terminal is rotated around an axis along an insertion direction of the terminal connection section, whereby the pair of caulked pieces is accommodated into the holding space.

9. A connection method of a terminal fitting having a terminal body and a plurality of terminal connection sections extended from the terminal body, a pair of fastening caulking pieces of a connection terminal connected to an end section of an electric wire caulking to a pair of caulked pieces provided on both side sections of the terminal connection section,

the connection method comprising:

forming a holding space configured to accommodate the pair of caulked pieces in the connection terminal by folding back inward upper end sections of the pair of fastening caulking pieces provided so as to stand upright on both side sections of the connection terminal;

detachably engaging the pair of fastening caulking pieces with the pair of caulked pieces using a provisional engaging mechanism provided between the terminal connection section and the connection terminal by inserting the pair of caulked pieces into the holding space; and

caulking the pair of caulked pieces inside the holding space by crushing the fastening caulking pieces.