JP3000133B2 - Wire holding structure of insulation displacement connector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wire holding structure of a press-connecting connector for preventing a wire from coming off of a press-connecting connector for press-fitting a covered wire to a press-connecting blade.

[0002]

2. Description of the Related Art Various types of wire holding structures for press-connecting connectors have been known. For example, Shokai 6
A structure disclosed in Japanese Patent Application Laid-Open No. 2-118363 is known. That is, as shown in FIG. 8, the electric wire holding structure 51 of the press-connecting connector includes a housing 53 in which a plurality of terminal accommodation chambers 52 extending in the front-rear direction are arranged side by side.
1 provided with a terminal 58. An upper wall 54 is provided at a front portion of the housing 53, and a cover 55 connected to a rear end of the upper wall 54 by a hinge (not shown) is provided so as to cover a rear portion of the housing 53. A locking claw 56 is provided at the rear end of the cover 55 so as to be locked to a bar 57 fixed to the rear end of the housing 53.

On the other hand, a contact piece fitting portion 59 for fitting with a mating contact piece (not shown) is provided at a front portion of the terminal 58. A bottom plate 60 having the same width is integrally extended from the lower rear end of the contact piece fitting portion 59 rearward, and a U-shaped press-contact blade 61 is formed. A slot (not shown) that opens upward is provided at the center of the press contact blade 61. further,
An electric wire caulking portion 63 for caulking the covered electric wire 62 is provided at the rear end of the bottom plate 60.

The contact piece fitting portion 59 in the terminal accommodating chamber 52 has a locking shoulder 64 provided at the front end of the upper wall 54 and a locking piece 65 provided at the front end of the cover 55.
Are positioned in the front-rear direction. A bottom hole 67 is provided at the rear end of the bottom plate 66 of the housing 53, and a bent portion 69 is formed in the electric wire 62 by a projection 68 provided to protrude downward on the lower surface of the rear end of the cover 55. It has become.

In the above construction, first, when the covered electric wire 62 is press-fitted from above the press contact blade 61, the covering portion is cut into a slot and the core portion of the electric wire 62 comes into contact with the press contact blade 61. Is electrically connected to the terminal 58. Further, the electric wire 62 is caulked by the electric wire caulking portion 63. Next, after the terminal 58 is housed in the terminal accommodating chamber 52 with the front end abutting on the locking shoulder 64, the cover 55 which is vertically raised by the hinge at the rear end of the upper wall 54 moves in the closing direction. When the locking pawl 56 is locked on the crosspiece 57 by rotation, the electric wire 62 is
7 to form a bent portion 69. Also,
At the same time, the rear end of the contact piece fitting portion 59 is locked rearward by the locking piece 65, thereby completing the assembly.

[0006] The wire holding structure 51 of the press-connecting connector includes:
Even if the electric wire 62 is pulled strongly backward, the tensile force is absorbed by the bent portion 69 and the electric wire caulking portion 63 and does not reach the press contact blade 61, that is, a so-called strain relief structure is provided.
That is, by forming the bent portion 69 in the electric wire 62, the electric wire 62 is prevented from coming out of the terminal 58 and the conduction is prevented from being poor.

Another conventional example is disclosed in Japanese Utility Model Laid-Open No.
A structure disclosed in Japanese Patent Application Publication No. 161 is known. The electric wire holding structure will be described with reference to the electric wire holding structure shown in FIG. 8. A leaf spring is provided integrally with the bottom plate 66 from the front and rear at the bottom of a bottom hole 67 provided at the rear end of the bottom plate 66 of the housing 53. The height of the projection 68 provided on the cover 55 is relatively low.
Therefore, even if the outer diameter of the electric wire 62 is slightly different due to this leaf spring, the bent portion 69 is always urged upward by an appropriate force, and the frictional force between the electric wire 62 and the projection 68 is always appropriate. Is kept at a value. Therefore, when the electric wire 62 is pulled backward, the electric wire holding action by the strain relief structure acts reliably and smoothly.

[0008]

However, in the conventional wire holding structure of the press-connecting connector, since the height of the projection 68 of the cover 55 is constant, if the outer diameter of the wire 62 is small, the distance between the bent portion 69 and the projection 68 is small. There is a problem that the frictional force of the wire decreases and the wire holding action decreases. Conversely, the electric wire 62
When the outside diameter of the cover 55 is large, the pushing force of the cover 55 for forming the bent portion 69 becomes large, and there has been a problem that the assembling work becomes difficult. Further, the electric wire 62 is pressed by the projection 68 to form a bent portion 69,
After a lapse of time after the assembly, the bent portion 69 is permanently deformed, and the frictional force with the projection 68 is reduced, so that there is a problem that the wire holding function is reduced.

Further, another conventional wire holding structure of a press-connecting connector has a plate spring provided before and after a bottom hole 67 so that the frictional force between the bent portion 69 and the projection 68 even when the outer diameter of the wire 62 changes. Is always kept at an appropriate value, but there is no element for enhancing the frictional force even if the electric wire 62 is pulled strongly backward. Therefore, there was a problem that the allowable tensile force could not be significantly increased, and the reliability of the wire holding action could not be improved.

SUMMARY OF THE INVENTION The object of the present invention has been made in view of the above-mentioned problems, and is intended to prevent a change in the diameter of an electric wire, a lapse of time after assembling, and an action of a strong pulling force behind the electric wire.
An object of the present invention is to provide an electric wire holding structure of a press-connecting connector in which a reliable electric wire holding action is ensured.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to press-connect an electric wire to a press-connecting blade comprising a U-shaped slot provided in a terminal, and to bend the wire into a housing and a cover behind the press-connecting blade. In the wire holding structure of the press-connecting connector, a reinforcing holding mechanism for increasing the holding force of the wire when an external force is applied in the backward direction of the wire includes a rear end portion of the terminal corresponding to a bent portion of the wire and a rear end portion of the cover. And a wire holding structure for a press-connecting connector.

Another object of the present invention is to hold an electric wire 5 by press-connecting a wire 5 to a press-connecting blade formed of a U-shaped slot provided in a terminal, and to bend the wire in the housing and the cover behind the press-connecting blade. In the structure, a reinforcing holding mechanism for increasing the holding force of the electric wire when an external force acts in the backward direction of the electric wire includes an elastic member provided at a terminal rear end corresponding to a rear portion of the bent portion of the electric wire, and a cover rear end. This can be achieved by the wire holding structure of the press-connecting connector, which is constituted by an inclined surface provided on the lower surface.

The above object can be attained by the elastic member being inclined in accordance with the inclination angle of the inclined surface.

The above object can be attained by the elastic member being bent forward and inclined from the rear end of the bottom plate of the terminal, and smoothly bent downward from the contact point with the electric wire.

Further, the above object is achieved by the elastic member being raised from the rear portion of the bottom plate of the terminal, and then gradually bent so as to form a plurality of vertices abutting on the rear portion of the bent portion of the electric wire. can do.

Further, the above object can be attained by forming a non-slip mechanism on a bottom wall of the housing in contact with the elastic member.

[0017]

In the wire holding structure of the press-connecting connector according to the present invention, a reinforcing holding mechanism for increasing the holding force of the wire when an external force acts in the backward direction of the wire includes a terminal rear end corresponding to a rear portion of the bent portion of the wire. And the rear end of the cover. Therefore, after the wire is first press-fitted and connected to the press contact blade, when the terminal caulked by the wire caulking portion is accommodated in the housing, the cover is attached to the housing from above. Then, a bent portion which can cope with a strong tensile force is formed in the electric wire by being sandwiched by the reinforcing holding mechanisms provided at the rear end of the terminal and the rear end of the cover. That is, even if the wire is pulled backward after assembly, it is more firmly held by the reinforcing holding mechanism,
A highly reliable strain relief structure can be formed.

Further, in the wire holding structure of the press-connecting connector according to the present invention, the reinforcing holding mechanism for increasing the holding force of the wire when an external force acts in the backward direction of the wire includes a terminal corresponding to the rear portion of the bent portion of the wire. It consists of an elastic member provided at the rear end and an inclined surface provided on the lower surface of the cover rear end. Therefore, the reinforcement holding mechanism is constituted by the elastic member of the terminal and the inclined surface of the cover,
When the cover is attached from above the housing, a bent portion is formed in the electric wire, and a rear portion of the bent portion is pressed by an appropriate urging force by the elastic member and the inclined surface. Then, when the electric wire is pulled backward, the electric wire is more firmly pressed and held on the inclined surface by the elastic member, and the electric wire holding action works more reliably.

Further, since the elastic member is inclined corresponding to the inclination angle of the inclined surface, the electric wire is firmly held between the elastic member and the inclined surface, and when the electric wire is pulled backward, The elastic member presses and holds the inclined surface more firmly, and the electric wire holding action is reliably performed.

Further, since the elastic member is bent forward and inclined from the rear end of the bottom plate of the terminal and smoothly bent downward from the contact point with the electric wire, when the electric wire is pulled backward, the elastic member is bent. Is displaced so that the contact point with the electric wire approaches the inclined surface. Therefore, the electric wire is bitten more firmly by the elastic member formed by the simple bending process having the inclined surface, and is pressed and held on the inclined surface, so that the electric wire holding action is reliably performed.

Further, the elastic member is raised from the rear portion of the bottom plate of the terminal, and thereafter is gradually bent so as to form a plurality of vertexes which are in contact with the rear portion of the bent portion of the electric wire. Therefore, when the electric wire is pulled backward, the vertices, which are a plurality of contact points of the elastic member with the electric wire, are displaced so as to approach the inclined surface. The surface is pressed and held in a shared manner, and a stable electric wire holding action is reliably performed.

Further, since the non-slip mechanism is formed on the bottom wall of the housing with which the elastic member contacts, when the electric wire is pulled backward, the contact of the elastic member with the electric wire is stabilized by the non-slip mechanism. It is displaced so as to approach the inclined surface. Therefore, the electric wire is more firmly and stably pressed and held on the inclined surface by the elastic member, and the stable electric wire holding action is reliably performed.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a wire holding structure for a press-connecting connector according to the present invention will be described below in detail with reference to FIGS. 1 to 4 and 6. FIG. 1 is an exploded perspective view showing an electric wire holding structure of the press-connecting connector according to the present embodiment, FIG. 2 is a cross-sectional view showing a state where assembly is completed in FIG. 1, FIG. 3 is a partially enlarged view showing a main part in FIG. FIG. 6 is a partially enlarged view showing a main part of the terminal in FIG. 3, and FIG. 6 is an operation explanatory view showing an electric wire holding operation when a tensile force acts in FIG.

As shown in FIG. 1, an electric wire holding structure 1 of a press-connecting connector includes a housing 2, a cover 3 covering a rear portion of the housing 2, and a terminal 4 for connecting electric wires. In the housing 2, a plurality of terminal accommodation chambers 6 for accommodating and holding a plurality of terminals 4 are partitioned by side walls 7 and arranged side by side. The upper wall 9 of the housing 2 is provided only at the front part of the housing 2, and the rear part is opened for convenience of assembling the terminals and the electric wires. A lance groove 10 is provided along the accommodation chamber at the front end of the bottom wall 8, and a locking shoulder 11 for locking the front end of the terminal 4 is provided below the front end of the upper wall 9. It is provided to protrude.

The cover 3 is locked in a locking groove 13 in the rear end of the upper wall 9 of the housing 2 by a locking piece 12 provided in the front end, and by a locking hole 14 provided in the rear end. It is configured to be locked by locking projections 15 provided on both side walls 7 of the housing 2. Further, an inclined surface 16 having a downwardly-facing shape is provided on the lower surface of the rear end portion of the cover 3, and a projection 17 projecting downward is provided in front of the inclined surface 16. A groove 18 for preventing interference between the projection 17 and the inclined surface 16 is provided in the side wall 7.

At the front end of the terminal 4, there is provided a hollow rectangular cylindrical contact piece fitting portion 19 into which a contact piece of a mating connector is fitted. The bottom plate of the contact piece fitting portion 19 extends rearward to form the bottom plate 20 of the terminal 4. At the front end of the bottom plate 20, a leaf spring-shaped lance 21 for preventing the terminal 4 from slipping back is provided so as to project obliquely rearward on the lower surface. A press-contact blade 22 is formed in the middle of the terminal 4 by bending the bottom plate 20 into an inverted U-shape. A U-shaped slot 23 is formed at the center of the press contact blade 22. Further, an electric wire caulking portion 24 for caulking the electric wire 5 is provided upright on both side ends of the bottom plate 20 behind the pressure welding blade 22.

The rear end of the bottom plate 20 is inclined forward and bent upward, and is smoothly bent downward at the highest contact point P to form a spring piece 25 as an elastic member.
Are formed. Therefore, after assembling the wire 5,
The wire crimping portion 24, the protrusion 17, the inclined surface 16, and the spring piece 25 are bent in the vertical direction to form a bent portion 26 (FIG. 2).
) Is formed. That is, the reinforcement holding mechanism 27 is constituted by the spring piece 25 and the inclined surface 16. As shown in FIG. 4, a non-slip mechanism 28 having a saw-tooth cross-section centered on the top of the spring piece 25, that is, the contact point P contacting the electric wire 5.
Is desirably provided.

In this embodiment having the above-described structure, when the electric wire 5 is first pushed in from above the press contact blade 22 of the terminal 4, the covering portion of the electric wire 5 is cut into the slot 23 and the core wire is pressed against the press contact blade 22. Thus, the electric wire 5 is electrically connected to the terminal 4. Then, the terminal 4 to which the electric wire 5 whose periphery has been crimped by the electric wire caulking portion 24 is connected rearward is housed in the terminal accommodating chamber 6 of the housing 2 and the lance 21 is provided at the rear end step of the lance groove 10. Locked. Furthermore, when the cover 3 is strongly pressed downward after the locking piece 12 of the cover 3 is hooked in the locking groove 13, the locking hole 14 is locked by the locking protrusion 15, so that the assembling is performed. Is completed.

At this time, as shown in FIG. 2 and FIG.
And the spring piece 25 is bent to form a bent portion 26. The electric wire 5 is pressed against the inclined surface 16 by an appropriate force by the spring piece 25 even if its outer diameter is slightly different. The front and rear ends of the contact piece fitting portion 19 are positioned in the front and rear direction by the locking shoulder 11 and the locking piece 12.

Next, the operation of the reinforcing holding mechanism 27 will be described. As shown in FIG. 3, the inclination angle α of the inclined surface 16 with respect to the horizontal plane, and the contact point P at which the spring piece 25 and the electric wire 5 are in contact with each other.
It is desirable that the relationship between the angle β between the line connecting the rear end E of the spring piece 25 and the horizontal plane be β <(α + 90 °). In other words, it is desirable that the line PE is inclined forward of the perpendicular to the inclined surface 16.

That is, as shown in FIG. 6, when the electric wire 5 is strongly pulled rearward and there is no slip at the contact point P, the line PE is pivotally displaced upward about the point E.
The contact point P is displaced in a direction approaching the inclined surface 16. Therefore, the electric wire 5 is sandwiched between the spring piece 25 and the inclined surface 16 with a stronger force, and the electric wire holding action works effectively. Therefore, the pulling force behind the electric wire 5 does not reach the press contact blade 22, so that even if electric wires having slightly different outer diameters are connected, the reliability of the electric wire holding action can be maintained.

As is apparent from the above description, there is no effect if a slip occurs between the contact point P of the spring piece 25 and the electric wire 5, so that the contact point P of the spring piece 25 as shown in FIG. It is desirable to provide a non-slip mechanism 28 having a saw blade cross section in the vicinity.

Next, a description will be given of a second embodiment of the wire holding structure of the press-connecting connector according to the present invention with reference to FIGS.
In the second embodiment, since the shape of the spring piece 30 as an elastic member is different from the shape of the spring piece 25 in the first embodiment, common parts are denoted by the same reference numerals, and description of common parts is omitted. I do. As shown in FIG. 5, the spring piece 30 is raised from the rear of the bottom plate 20 of the terminal 4, the apex T is brought into contact with the lower surface of the electric wire 5 behind the bent portion 26, and the bottom wall 8 has a bottom point B. A plurality of progressively continuous bent shapes that are in contact with each other are formed. It is desirable that the relationship between the angle β and the inclination angle α of the line TB connecting the vertex T and the bottom point B with respect to the horizontal plane is β <(α + 90 °).

That is, as shown in FIG. 7, when the electric wire 5 is strongly pulled backward, assuming that there is no slip at the apex T and the bottom point B, the line TB is rotated backward about the bottom point B. Therefore, the vertex T is displaced in a direction approaching the inclined surface 16.
Therefore, the electric wire 5 is sandwiched between the spring piece 30 and the inclined surface 16 with a stronger force. Moreover, since the apex T is formed at three places, the holding force is further stronger than the holding force in the first embodiment, and the electric wires 5 are substantially uniformly pressed against the inclined surface 16 because they are dispersed at the three places. Will be. Therefore, the stable wire holding action will work more reliably, and the rearward pulling force of the wire 5 will not reach the pressure welding blade. The reliability of the holding mechanism will be further improved.

Further, as is clear from the above description,
There is no effect if slippage occurs at the top point T and the bottom point B. Regarding the vertex T, the shape of the vertex T is acute,
Considering that the coating of is made of a soft synthetic resin material, the inconvenience of slipping hardly occurs. More preferably, a non-slip mechanism having a sawtooth-shaped cross section is provided at the apex T as in the above-described embodiment. As for the bottom point B, since the bottom wall 8 of the mating housing 2 is made of a hard synthetic resin material, a non-slip mechanism 31 having a sawtooth cross section is provided on the upper surface of the bottom wall 8 and the rear end of the bottom wall 8 is provided. It is desirable to form the stopper 32 at the bottom. Therefore, the reinforcement holding mechanism 33 is constituted by the spring piece 30 and the inclined surface 16.

It should be noted that the present invention is not limited to the above-described embodiment, but can be carried out in other modes by making appropriate changes. For example, in the present embodiment, in order to prevent interference with the side wall 7, the inclined surface 16 and the protrusion 17
Is provided with a groove 18 in the axial direction, but in order to prevent the strength of the inclined surface 16 and the cover 3 from being reduced, it is also possible to provide a notch for preventing the groove 18 and preventing interference on the side wall 7 side. Can be.

[0037]

As described above, according to the wire holding structure of the press-connecting connector of the present invention, the reinforcing holding mechanism for increasing the holding force of the wire when an external force acts in the backward direction of the wire,
The terminal is provided at the rear end of the terminal corresponding to the rear of the bent portion of the electric wire and at the rear end of the cover. Therefore, a bent portion which can cope with a strong tensile force by being held by the reinforcing holding mechanism is formed in the electric wire. That is, even if the electric wire is pulled rearward after assembling, it is more firmly held by the reinforcing holding mechanism, so that a highly reliable strain relief structure can be formed.

Further, a reinforcing holding mechanism for increasing the holding force of the electric wire when an external force acts in the backward direction of the electric wire includes an elastic member provided at the rear end of the terminal corresponding to the rear portion of the bent portion of the electric wire, It is composed of an inclined surface provided on the lower surface of the end. Therefore, since the reinforcing holding mechanism is constituted by the elastic member of the terminal and the inclined surface of the cover, the rear part of the bent portion of the electric wire is pressed by the elastic member and the inclined surface with an appropriate urging force. Therefore, even if the electric wire is pulled rearward, the electric wire holding action in which the electric wire is more strongly pressed and held on the inclined surface by the elastic member works.

Further, since the elastic member is inclined corresponding to the inclination angle of the inclined surface, the electric wire is firmly held between the elastic member and the inclined surface, and when the electric wire is pulled backward, The elastic member presses and holds the inclined surface more firmly, so that the electric wire holding action reliably works.

Further, since the elastic member is bent forward and inclined from the rear end of the bottom plate of the terminal and smoothly bent downward from the contact point with the electric wire, when the electric wire is pulled backward, the elastic member is bent. Is displaced so that the contact point with the electric wire approaches the inclined surface. Therefore, the electric wire holding action in which the electric wire is more firmly pressed and held on the inclined surface by the elastic member formed by the simple bending process having the inclined surface surely works.

Further, the elastic member is raised from the rear portion of the bottom plate of the terminal, and thereafter is gradually bent so as to form a plurality of apexes which are in contact with the rear portion of the bent portion of the electric wire. Therefore, when the electric wire is pulled backward, the electric wire is shared by the elastic members on the inclined surface at a plurality of positions, and the electric wire holding action of more strongly pressing and holding works reliably and stably.

Further, since the anti-slip mechanism is formed on the bottom wall of the housing with which the elastic member comes into contact, when the electric wire is pulled backward, the anti-slip mechanism allows the reinforcing holding mechanism to operate stably without malfunction. Therefore, the wire is more securely, stably and reliably pressed and held on the inclined surface by the elastic member, so that the wire holding action reliably works, and a wire holding structure with excellent reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a first embodiment of an electric wire holding structure of a press-connecting connector of the present invention.

FIG. 2 is a cross-sectional view showing a completed assembly state in FIG. 1;

FIG. 3 is a partially enlarged view of a reinforcement holding mechanism in FIG. 2;

FIG. 4 is a partially enlarged view in which an anti-slip mechanism is provided on the elastic member in FIG. 3;

FIG. 5 is a partially enlarged view of a reinforcing holding mechanism showing a second embodiment of the wire holding structure of the press-connecting connector of the present invention.

FIG. 6 is an operation explanatory view showing a state where a tensile force acts in FIG. 3;

FIG. 7 is an operation explanatory view showing a state where a tensile force acts in FIG. 5;

FIG. 8 is a cross-sectional view showing a conventional wire holding structure of a press-connecting connector.

[Explanation of symbols]

 2 Connector housing (housing) 3 Cover 4 Terminal 5 Electric wire 8 Bottom wall 16 Inclined surface 17 Projection 19 Contact piece fitting part 20 Bottom plate 22 Pressure contact blade 23 Slot 24 Wire crimping part 25, 30 Spring piece (elastic member) 26 Bending part 27 , 33 Reinforcement holding mechanism 28, 31 Non-slip mechanism α Tilt angle P Contact point T Vertex B Bottom point

Claims (6)

(57) [Claims] 1. An electric wire holding structure for a press-connecting connector, wherein an electric wire 5 is press-connected to a press-connecting blade comprising a U-shaped slot provided in a terminal, and the wire is bent in a housing and a cover behind the press-connecting blade. In the above, the reinforcing holding mechanism for increasing the holding force of the wire when an external force acts in the backward direction of the wire is provided at the terminal rear end and the cover rear end corresponding to the bent portion rear portion of the wire. An electric wire holding structure for a press-connecting connector. 2. An electric wire holding structure for a press-connecting connector, wherein an electric wire is press-connected to a press-connecting blade formed of a U-shaped slot provided in a terminal, and the wire is bent in a housing and a cover behind the press-connecting blade. An elastic member provided at a rear end of the terminal corresponding to a rear portion of a bent portion of the electric wire, wherein a reinforcing holding mechanism for increasing a holding force of the electric wire when an external force acts in a backward direction of the electric wire; An electric wire holding structure for a press-connecting connector, comprising an inclined surface provided on a lower surface of an end portion. 3. An electric wire holding structure for a press-connecting connector according to claim 2, wherein said elastic member is inclined in accordance with an inclination angle of said inclined surface. 4. The terminal according to claim 2, wherein the elastic member has a shape that bends obliquely forward from a rear end of a bottom plate of the terminal and smoothly bends downward from a contact point with the electric wire. 4. The electric wire holding structure of the press-connecting connector according to 3. 5. The method according to claim 5, wherein the elastic member is raised from a rear portion of a bottom plate of the terminal, and then is gradually bent so as to form a plurality of vertexes abutting on a bent portion rear portion of the electric wire. The wire holding structure for a press-connecting connector according to claim 2 or 3, wherein: 6. An electric wire holding structure for a press-connecting connector according to claim 5, wherein a non-slip mechanism is formed on a bottom wall of said housing with which said elastic member contacts.