JP2013020832A - Fitting confirmation structure for terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fitting confirmation structure for a terminal, the structure enables a user to confirm the fitting of a terminal in a housing with less steps, capable of surely guiding the terminal into the housing to securely lock it to a locking lance.SOLUTION: A fitting confirmation structure for a terminal is provided, the structure has a pin 5 for confirming the fitting of a terminal, the pin penetrating a terminal accommodating room 7 in an insulating housing 1 and a box-shaped part 9 of a terminal 8. The pin has a claw part 6 at its front end. With the claw part locked to an end part 10a that is positioned in the pin penetrating direction of the box-shaped part, the terminal is inserted into and locked to the terminal accommodating room in the direction opposite to the pin penetrating direction. While pressing the claw part in the unlocking direction by a flexible locking lance 31 in the terminal accommodating room, the pin can be pulled out in the terminal inserting direction by locking the locking lance to the end part of the box-shaped part. The pin 5 has a step portion 16 at lengthwise intermediate position, and a pin portion 5a, that is a portion from the step portion to the claw part 6, is arranged eccentrically in the direction to the end part side inner surface 10b of the box-shaped part 9. A pair of contact ribs 20 for the mating terminal are provided at the inner surface 10b of the box-shaped part 9, and the pin 5 is penetrated between the pair of contact ribs into the box-shaped part.

Description

  The present invention relates to a terminal fitting confirmation structure for confirming that a terminal is inserted and locked in a housing of an electrical connection box, a connector of a wire harness, or the like.

  6 (a) and 6 (b) show an embodiment of a conventional terminal fitting confirmation structure.

  In this terminal fitting confirmation structure, for example, a female terminal 53 with an electric wire is inserted into a terminal accommodating chamber 52 of a housing 51 made of an insulating resin in a relay block, a connector, or the like, and a flexible engagement in the terminal accommodating chamber 52 is performed. The rectangular electrical contact portion 55 of the female terminal 53 is locked by the locking lance 54, and the checker (jig rod) is inserted into the bending space 56 of the locking lance 54 in the normal fitting state of the female terminal 53 of FIG. ) 57 is completely inserted and the normal fitting of the female terminal 53 is confirmed.

  Further, in the irregular (semi) fitting state of the female terminal 53 in FIG. 6B, the tip of the checker 57 is attached to the tip of the locking lance 54 that is pushed by the electrical contact portion 55 and bent into the bending space 56. When the checker 57 is incompletely inserted, the irregular (half) fitting of the female terminal 53 is detected. Before checking the terminal fitting by the checker 57, it is also checked whether the female terminal 53 is pulled out by pulling the terminal-attached electric wire.

  A male terminal of an electric component (not shown) such as a relay or a fuse is inserted into the housing 51 of the relay block (electric connection box) and connected to the female terminal 53. A connector housing 51 (not shown) is fitted into the connector housing 51, and the male terminal in the mating housing is connected to the female terminal 53.

  When a male terminal (not shown) is inserted in the terminal insertion chamber (52) of the housing (51) instead of the female terminal 53, a box-shaped portion (following the flat or pin-shaped electrical contact portion of the male terminal ( (Not shown) is locked by a locking lance (54), and the flat or pin-shaped electrical contact portion protrudes into the hood portion from the hole in the front wall of the terminal accommodating chamber (52), and the other side of the hood portion enters the hood portion. A housing containing a female terminal is fitted.

  As a means for preventing incomplete fitting of the terminal to the connector housing, for example, in Patent Document 1 (not shown), as a terminal insertion device, a guide rod is provided on a support base so as to be able to advance and retract. When inserting a terminal with a wire that has been gripped by a chuck into the terminal housing chamber of the connector housing, the tip of the terminal is magnetically attached with the guiding rod inserted into the terminal housing chamber, and the retracting operation of the guiding rod is performed. The terminal is pushed into the terminal accommodating chamber with a chuck while guiding the terminal into the terminal accommodating chamber.

JP 2002-110310 A

  However, in the conventional terminal fitting confirmation structure shown in FIG. 6, after inserting the terminal 53 into the housing 51, the checker (jig bar) 57 must be inserted into and removed from the housing 51. However, there is a problem that the number of assembling steps for the relay block, the connector, and the like increases due to the trouble of inserting and removing the checker 57.

  Moreover, in the terminal insertion device described in the above-mentioned conventional Patent Document 1, for example, when the magnetic force of the guide rod is weakened, the inductivity of the terminal to the terminal housing chamber of the connector housing may decrease. There was concern.

  In view of the above-described points, the present invention can perform the fitting confirmation of the terminal in the housing with a small number of man-hours, and reliably guides the terminal into the housing and securely locks the terminal to the locking lance. An object of the present invention is to provide a terminal fitting confirmation structure.

  In order to achieve the above object, a terminal fitting confirmation structure according to claim 1 of the present invention includes a terminal fitting confirmation pin that passes through a terminal accommodating chamber of an insulating housing and a box-shaped portion of a terminal. The pin has a claw at the tip, and the pin is inserted into the terminal receiving chamber in a direction opposite to the pin penetration direction, with the claw being engaged with the end of the box-like portion in the pin penetration direction. By inserting and fitting, the locking lance is locked to the end of the box-shaped portion while pressing the claw portion in the unlocking direction with a flexible locking lance in the terminal accommodating chamber. The pins can be extracted in the terminal insertion direction.

  With the above configuration, the pin penetrates the terminal receiving chamber of the housing and the box-shaped portion of the terminal, the claw portion of the pin engages with the end of the box-shaped portion of the terminal, and the pin is pulled in the opposite direction in that state. While being guided, the terminal is smoothly guided and guided into the terminal accommodating chamber of the housing by the pin without interference. At the same time that the terminal is completely inserted (fitted) into the terminal accommodating chamber, the locking lance in the terminal accommodating chamber pushes the pin claw in the unlocking direction, and the spring force of the locking lance is greater than the spring force of the pin. Largely, the pin is bent and unlocked, and at the same time, the locking lance is engaged with the end of the box-shaped portion of the terminal (the end is locked) to prevent the terminal from coming off.

  The terminal fitting confirmation structure according to claim 2 is the terminal fitting confirmation structure according to claim 1, wherein the pin has a stepped portion at a middle portion in the longitudinal direction, and the pin between the stepped portion and the claw portion. The portion is eccentric toward the inner surface on the end side of the box-shaped portion.

  With the above configuration, the pin portion between the stepped portion of the pin and the claw portion is in close contact with the inner surface of the terminal box-shaped portion without any gap, and the pin claw portion firmly catches and locks the end of the box-shaped portion. .

  The terminal fitting confirmation structure according to claim 3 is the terminal fitting confirmation structure according to claim 1 or 2, wherein a pair of contact ribs for the mating terminal is provided on the inner surface of the box-shaped portion, and the pin is the pair of contact ribs. The box-shaped portion is passed through between the contact ribs.

  With the above configuration, the pin is inserted into the box-shaped portion using the dead space between the pair of contact ribs. When a female terminal is used as the terminal, for example, the mating male terminal elastically contacts the contact spring piece facing the contact rib, but the pin passes through without contacting the contact spring piece and contacts. The spring property of the spring piece is ensured.

  According to the first aspect of the present invention, since the pin retraction operation is performed simultaneously with the terminal insertion operation in the state where the terminal fitting confirmation pin is inserted into the housing and the terminal, the terminal is fitted into the housing. Confirmation can be performed with less man-hours. Further, in a state where the terminal is locked by the claw portion of the pin penetrating the housing, the terminal can be reliably guided into the housing and securely locked to the locking lance of the housing.

  According to the second aspect of the present invention, the pin portion that follows the claw portion is brought into close contact with the inner surface of the terminal box-shaped portion with no gap by the stepped portion of the pin, so that the pin claw portion is firmly attached to the end of the box-shaped portion. Can be prevented, and the engagement confirmation accuracy of the terminal to the housing can be improved, and the inductivity of the terminal to the terminal receiving chamber of the housing can be increased.

  According to the invention of claim 3, the pin of the contact spring piece in the box-shaped part when the female terminal is used as the terminal is inserted by using the space between the pair of contact ribs of the box-shaped part. It is possible to prevent the elastic deformation and to secure the electrical contact property of the contact spring piece.

It is a longitudinal cross-sectional view which shows the state before terminal insertion in one Embodiment of the terminal fitting confirmation structure which concerns on this invention. It is a disassembled perspective view which shows one form of the terminal used with a terminal fitting confirmation structure, and the pin for terminal fitting confirmation. It is a longitudinal cross-sectional view which shows the state in the middle of terminal insertion in a terminal fitting confirmation structure. Similarly, it is a longitudinal cross-sectional view (the inside of a frame is a principal part enlarged view) which shows the state which inserted the terminal completely. It is a longitudinal section showing the state where a pin is similarly extracted from a terminal. 1A and 1B show a form of a conventional terminal fitting confirmation structure, in which FIG. 4A is a longitudinal sectional view of a terminal in a properly fitted state, and FIG.

  1 to 5 show an embodiment of a terminal fitting confirmation structure according to the present invention.

  As shown in FIG. 1, a housing 1 made of insulating resin is stably supported by a horizontal wall 3 'and a vertical wall 3 of a metal or synthetic resin cradle 2 for inserting pins into the vertical wall 3. The hole 4 is provided, and a pin 5 for confirming terminal fitting made of metal or synthetic resin is provided in the hole 4 so as to be movable forward and backward (horizontal direction).

  The inner width W in the vertical direction of the hole 4 is slightly larger than the thickness T of the claw 6 at the tip of the pin 5, and the inner width (not shown) in the horizontal direction of the hole 4 is the pin 5 (FIG. 2). The pin 5 slides along the inner surface of the hole 4 without any positional deviation in the vertical and horizontal directions, and the claw portion 6 at the tip can enter the hole 4 (from the hole 4). You can go outside).

  The pin 5 penetrates the terminal insertion chamber 7 of the housing 1 from the front to the rear, and further along the inner surface of the upper wall 10 of the rectangular box-shaped electrical contact portion (box-shaped portion) 9 of the female terminal (terminal) 8 with electric wire. Through the gap between the upper wall 10 and the contact spring piece 14, the electrical contact portion 9 passes through from the front to the rear.

  The terminal 8 with the electric wire is positioned with respect to the terminal accommodating chamber 7 by holding the rear electric wire 11 with the chuck 12 in the vicinity of the terminal 8. It is preferable that the terminal 8 is previously bent and corrected with respect to the electric wire 11 so as to be positioned straight forward in the axial direction of the electric wire 11.

  As shown in FIG. 2, the pin 5 has an upper and lower wide surface 13 and a left and right narrow surface 15 and is formed in a rectangular shape in cross section, and a protruding claw portion on the tip side of the horizontal upper surface 13. 6 is integrated. The claw portion 6 includes an inclined surface 6a on the front end side (rear end side), a vertical locking surface 6b on the base end (front end), and a horizontal flat surface 6c between the inclined surface 6a and the locking surface 6b. Have.

  The pin portion 5a following the claw portion 6 is bent in a step shape from the top to the bottom in the middle portion in the longitudinal direction (the step portion is indicated by reference numeral 16), and the rear side (claw portion 6 side) upper surface 13 is a short step having an inclined shape. It continues to the upper surface 13 on the front side via the surface 16a. Similarly, the rear lower surface (not shown) continues to the front lower surface (not shown) via a short step surface 16b. The stepped portion 16 positions the front end side (rear end side) pin portion 5a eccentrically toward the upper wall 10 of the electrical contact portion 9 of the terminal 8 with respect to the front pin portion 5b.

  As shown in FIG. 1, the front end (rear) pin portion 5 a penetrates the electrical contact portion 9 of the terminal 8, and the claw portion 6 is locked to the rear end (end portion) 10 a of the upper wall 10 of the electrical contact portion 9. The top surface 13 of the pin portion 5a on the distal end side is in close contact with the inner surface 10b of the upper wall 10 of the electrical contact portion 9, and the step portion 16 of the pin 5 is on the distal end (front end) side of the electrical contact portion 9. Located exposed. A portion 5 b on the front side of the stepped portion 16 of the pin 5 passes through the hole portion (mating terminal insertion hole) 17 of the terminal accommodating chamber 7 of the housing 1 from the hole portion 4 of the cradle 2. The claw 6 is positively brought into contact with the upper wall 10 of the electrical contact portion 9 by the step portion 16 of the pin 5. Thereby, the nail | claw part 6 of the pin 5 is reliably latched by the rear end 10a of the upper wall 10 of the electrical contact part 9, and the pressing of the contact spring piece 14 by the pin 5 is also prevented.

  As shown in FIG. 2, the female terminal 8 is an existing one, and an electric contact portion main body (indicated by reference numeral 9) formed in a rectangular cylindrical shape by plate-like wall portions 10, 18 (FIG. 1), 19 on the upper, lower, left and right sides. The electric contact portion 9 is constituted by the contact spring piece 14 folded upward and rearward from the front end of the lower wall portion 18 (FIG. 1). A pair of left and right contact ribs 20 in the terminal longitudinal direction bulge inwardly on the upper wall 10, and the distance between the pair of contact ribs 20 is greater than the lateral width W2 of the pin 5 (the lateral width W2 of the pin 5 is a pair of contact) The pin 5 enters between the pair of contact ribs 20, and the upper surface 13 of the pin 5 contacts the inner surface 10 b (FIG. 1) of the upper wall 10 of the electrical contact portion 9.

  The mating male terminal (not shown) linearly contacts the protruding tips of the pair of contact ribs 20 and flexes the contact spring piece 14 downward to elastically contact the contact spring piece 14. The thickness T2 of the pin 5 is smaller than the thickness of the mating male terminal (not shown) (for example, about half the thickness), and the pin 5 is lightly in contact with the contact spring piece 14. Thus, the contact spring piece 14 is not bent.

  A pair of front walls 21 are bent inward from the front ends of the left and right wall portions 19 of the electrical contact portion main body 9, and a substantially slit-shaped insertion port 22 for the mating male terminal and the pin 5 is formed on the upper side of the front wall 21. Has been. At least the lower wall 18 (FIG. 1) of the electrical contact portion main body 9 is integrally formed with a crimp connection portion 23 for the core wire portion 11a on the front side of the electric wire 11 and a crimp fixing portion 24 for the insulation coating portion 11b on the rear side of the electric wire 11. in the process of.

  As shown in FIG. 1, the housing 1 is formed in a rectangular shape having upper and lower and left and right outer walls 25, 26, 27, and has at least two upper and lower terminal accommodating chambers 7, 7 'horizontally. Each terminal accommodating chamber 7, 7 ′ has a slit-shaped or rectangular small hole (opening) 17 for inserting a mating terminal and inserting a pin in the vertical front wall 28, and a female terminal insertion at the rear end. It has rectangular large openings 7a and 7a ', and has downward flexible terminal locking lances 31 and 32 on the horizontal storage chamber upper walls 29 and 30, respectively.

  In this example, the lower locking lance 31 includes a flexible lance main body (substitute with reference numeral 31) extended on the same plane as the housing chamber upper wall 29, and a front end (front end) side of the lance main body 31. The upper locking lance 32 is composed of a downwardly projecting protrusion 31a. The upper locking lance 32 is a flexible lance main body (substitute with reference numeral 32) inclined forward and downward, and a stepped protrusion at the tip (front end) of the lance main body 32. 32a, and the male terminal insertion / pin insertion hole 17 is positioned slightly forward of the protrusions 31a and 32a. The housing 1 is an existing one. For example, the housing 1 may be formed integrally with an insulating resin block main body for an electrical junction box, or may be a connector housing for a wire harness (the connector is composed of the housing 1 and the terminal 8). Configured).

  As shown in FIG. 1, the terminal 8 with the electric wire grips the electric wire portion 11 with the chuck 24 and moves forward toward the rear opening 7 a of the terminal accommodating chamber 7 of the housing 1, and the tip (front end) of the terminal 8 is the rear part. Oppositely located close to the opening 7a. A pin 5 is inserted into the terminal accommodating chamber 7 of the housing 1 through the hole 4 of the receptacle 2 and the front opening 17 of the terminal accommodating chamber 7 in the opposite direction to the terminal insertion, and protrudes rearward from the rear opening 7a. The claw portion 6 at the tip of the pin 5 is in sliding contact along the inner surface 10b of the upper wall 10 through the gap between the upper wall 10 of the electric contact portion 9 of the terminal 8 and the contact spring piece 14, and the electric contact portion 9 And is caught by the rear end 10a of the upper wall 10 to be locked. In a state where the main body portion 5 a having a rectangular cross section of the pin 5 is supported upward by the contact spring piece 14, the claw portion 6 is reliably engaged with the rear end 10 a of the upper wall 10.

  The forward movement of the terminal 8 and the backward movement of the pin 5 may be performed simultaneously or separately. The forward / backward movement of the pin 5 is performed straight (horizontal) using a driving means (not shown) such as a horizontal air cylinder or solenoid. Each terminal 8 may be inserted into the upper and lower terminal accommodating chambers 7 and 7 'separately or simultaneously. Corresponding to each terminal accommodating chamber 7, 7 ', each pin 5 is advanced or retracted separately or simultaneously.

  While the pin 5 is pulled back horizontally from the state of FIG. 1, the terminal 8 is horizontally moved forward by the chuck 12, whereby the terminal 8 is guided to the pin 5 as shown in FIG. The tip is smoothly inserted into the terminal accommodating chamber 7 without being brought into contact with (interfering with) the rear end edge 7 a of the terminal accommodating chamber 7.

  In FIG. 3, the terminal 8 is in the middle of insertion, and the locking lance 31 of the housing 1 is pushed upward and bent by the upper wall 10 of the electrical contact portion 9 of the terminal 8. The bending force (elastic force) of the pin 5 in the plate thickness direction is smaller than the elastic force (pressing force) of the locking lance 31, and the locking lance 31 can easily deflect the pin 5.

  3, the front end of the terminal 8 is brought into contact with the inner surface of the front wall 28 of the housing 1 as shown in FIG. At the same time, the projection 31a of the locking lance 31 pushes the claw 6 at the tip of the pin 5 downward as shown by the arrow A, that is, in the direction opposite to the bending of the locking lance 31, The engagement between the claw portion 6 and the rear end 10 a of the upper wall 10 of the electrical contact portion 9 of the terminal 8 is released, and the vertical front end face 31 a ′ of the protrusion 31 a of the locking lance 31 is located behind the upper wall 10 of the terminal 8. Engage with the end 10a to lock the terminal 8 without being pulled out.

  By pulling the pin 5 forward in this state, the pin 5 is smoothly pulled out from the terminal 8 and the housing 1 with its claw portion 6 slidingly contacting the inner surface 10b of the upper wall 10 of the terminal 8 as shown in FIG. . When the extraction of the pin 5 is completed, it is detected that the locking lance 31 has locked the terminal 8. That is, it is confirmed that the terminal 8 is completely fitted in the terminal accommodating chamber 7.

  If the insertion of the terminal 8 into the terminal accommodating chamber 7 is incomplete in FIG. 4, the upper wall 10 of the terminal 8 abuts against the protrusion 31a of the locking lance 31 as in FIG. Since the stop lance 31 remains bent outward (upward), the projection 31a of the lock lance 31 cannot press the claw portion 6 of the pin 5 inward (downward), and the nail Since the portion 6 is caught by the rear end 10a of the upper wall 10 of the terminal 8 and the pin 5 is prevented from being pulled out forward, it is detected that the terminal 8 is incompletely fitted in the terminal accommodating chamber 7. The

  In the above embodiment, the housing 1 is horizontally arranged on the cradle 2 and the terminals 8 are horizontally inserted toward the housing 1. However, the housing 1 is formed integrally with an insulating block for an electrical connection box such as a relay block. When the terminal is inserted into the housing 1, the insulation block is large (the area that hits the vertical wall 3 of the cradle 2 is large), and therefore the housing 1 is placed vertically rather than horizontally on the cradle 2 (FIG. 1). Terminal 8 is vertically gripped by, for example, a horizontal chuck 12 and inserted into the housing 1 from the top downward, and at the same time, the pin 5 is moved from the bottom upward into the housing 1. It is preferable that the terminal 8 penetrates vertically into the electrical contact portion 9 of the terminal 8 and is guided downward into the vertical terminal accommodating chamber 7. In this case, for example, the upper and lower wall portions 25, 26, 10, and 18 of the housing 1 and the terminal 8 in the above description are front and rear or left and right wall portions.

  In the above embodiment, the example in which the female terminal 8 is inserted into the housing 1 has been described. However, as described in the background art, a male terminal (not shown) is accommodated in the housing (1) instead of the female terminal 1. In this case, the pin 5 is passed through the rectangular cylindrical box-shaped portion (9) following the tab-shaped or pin-shaped electrical contact portion of the male terminal, and the rear end 10a of the box-shaped portion (9) is connected to the pin 5. At the same time as the male terminal is engaged with the terminal housing chamber (7) of the housing (1), the claw part (6) is pushed inward with the locking lance (31) in a box shape. The locking with the portion (9) is released, the protrusion (31a) of the locking lance (31) is locked with the rear end (10a) of the box-shaped portion (9), and the pin 5 is pulled forward in that state. Thus, the complete fitting of the male terminals can be detected.

  In this case, the box-shaped part (9) has a length in the front-rear direction shorter than the half of the rectangular box-shaped electric contact part main body 9 of FIG. A pin insertion hole communicating with the male terminal insertion hole is provided on the front wall of the terminal accommodating chamber (for example, a pin insertion hole having a width smaller than that of the male terminal insertion hole 17 is continuously provided above the terminal insertion hole 17 in FIG. ). A hood portion that covers the electrical contact portion of the male terminal is integrally provided in front of the male terminal insertion hole (17) of the housing (1).

  Moreover, the structure demonstrated by the said embodiment of this invention is effective also as a terminal fitting confirmation method other than as a terminal fitting confirmation structure.

  The terminal fitting confirmation structure according to the present invention easily confirms whether or not the terminal is inserted into the housing of the relay block or fuse block or the housing of the connector of the wire harness and completely locked with less man-hours, The terminal can be used to guide the terminal smoothly and reliably in the housing without interference and to securely lock the terminal to the locking lance.

DESCRIPTION OF SYMBOLS 1 Housing 5 pin 5a Pin part 6 Claw part 7 Terminal accommodation chamber 8 Female terminal (terminal)
9 Electric contact part (box-like part)
10a Rear end (end)
10b Inner surface 16 Stepped portion 20 Contact rib 31 Locking lance

Claims (3)

  A pin for confirming terminal fitting that penetrates the terminal accommodating chamber of the insulating housing and the box-shaped part of the terminal is provided, the pin has a claw part at the tip, and the pin of the box-shaped part penetrates the claw part. With the end in the direction locked, the terminal is inserted and fitted into the terminal accommodating chamber in the direction opposite to the pin penetration direction, and the claw is engaged with the flexible locking lance in the terminal accommodating chamber. A terminal fitting confirmation structure characterized in that the pin can be extracted in the terminal insertion direction by locking the locking lance to the end portion of the box-shaped portion while pressing in the locking release direction.   The pin has a step portion in a middle portion in a longitudinal direction, and a pin portion between the step portion and the claw portion is eccentric toward an inner surface of the box-like portion on the end side. Item 1. The terminal fitting confirmation structure according to Item 1.   The pair of contact ribs for the mating terminal is provided on the inner surface of the box-shaped part, and the pin passes through the box-shaped part through the pair of contact ribs. Terminal fitting confirmation structure.

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