Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
2002-04-24
2003-12-02
Nguyen, Chau N. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
C174S08400S
Reexamination Certificate
active
06657126
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a structure and a method for branching a conductive wire from a shielded wire which including a core conductive wire and an insulating sheath.
A related-art example of this kind has been disclosed in Japanese Patent Publication No. 4-269470A shown in
FIGS. 17 and 18
.
In a branching structure shown in
FIG. 17
, an insulating outer sheath
101
provided in the vicinity of the end of a shielded wire
100
is partially peeled and a braided wire
102
to be a shielding cover is exposed. An insulating outer sheath
104
provided on the end of a grounding wire
103
is peeled to expose a conductive wire
105
. The braided wire
102
of the shielded wire
100
and the conductive wire
105
of the grounding wire
103
are pressed and fixed through a coupling member
106
.
In a branching structure shown in
FIG. 18
, an insulating outer sheath
111
provided on the end of a shielded wire
110
is peeled to expose a drain wire
112
, and the drain wire
112
thus exposed is used as a grounding wire.
However, both of the branching structures have a problem in that the number of steps is great and a large number of manual works are to be carried out. For this reason, automation cannot be achieved;
A related branching structure to solve such a problem has been disclosed in Japanese Patent Publication No. 11-135167A shown in
FIGS. 19 and 20
.
In the branching structure shown in
FIGS. 19 and 20
, a braided wire
120
d
of a shielded wire
120
is electrically connected to a conductive wire
123
a
of a grounding wire
123
by an ultrasonic horn
125
through a pair of resin members
121
and
122
.
In other words, the shielded wire
120
is constituted by one shielding core
120
c
having a core
120
a
covered with an insulating inner sheath
120
b,
a conductive braided wire
120
d
for covering the outer periphery of the shielding core
120
c,
and an insulating outer sheath
120
e
for further covering the outer periphery of the braided wire
120
d.
A pair of resin members
121
and
122
have concave portions
121
b
and
122
b
for forming a hole corresponding to the outer sectional shape of the shielded wire
120
with mutual bonding faces
121
a
and
122
a
buffed against each other, respectively. The grounding wire
123
is constituted by the conductive wire
123
a
and an insulating outer sheath
123
b
for covering an outer periphery thereof. The ultrasonic horn
125
is constituted by a lower support base (not shown) provided in a lower part and an ultrasonic horn body
125
a
provided in an upper part.
Next, a blanching procedure will be described. The lower resin member
122
is provided on the lower support base (not shown) of the ultrasonic horn
125
, the shielded wire
120
is mounted from thereabove, one end of the grounding wire
123
is mounted thereon, and furthermore, the upper resin member
121
is put from thereabove. Thus, the shielded wire
120
is provided In the concave portions
121
b
and
122
b
of the resin members
121
and
122
, and the grounding wire
123
is provided between the shielded wire
120
and the upper resin member
121
.
In this state, a vibration is applied by the ultrasonic horn
125
while applying compression force between the resin members
121
and
122
. Consequently, the insulating outer sheath
120
e
of the shielded wire
120
and the Insulating outer sheath
123
b
of the grounding wire
123
are fused and scattered by the internal heat generation of a vibration energy so that the conductive wire
123
a
of the grounding wire
123
and the braided wire
120
d
of the shielded wire
120
come in electrical contact with each other. Moreover, each of the contact portions of the bonding faces
121
a
and
122
a
of the resin members
121
and
122
, the contact portion of the internal peripheral faces of the concave portions
121
b
and
122
b
of the resin members
121
and
122
, the insulating outer sheath
120
e
of the shielded wire
120
, the contact portion of the insulating resin
123
b
of the grounding wire
123
, and the resin members
121
and
122
are fused by the heat generation of the vibration energy and the fused portions are solidified after the ultrasonic vibration is completely applied. Consequently, the resin members
121
and
122
, the shielded wire
120
and the grounding wire
123
are fixed to each other.
According to the branch processing, it is not necessary to peel the insulating outer sheaths
120
e
and
123
b
of the shielded wire
120
and the grounding wire
123
, and the lower resin member
122
, the shielded wire
120
, the grounding wire
123
and the upper resin member
121
are simply assembled in this order to give the ultrasonic vibration. Consequently, the number of steps is decreased, and a complicated manual work is not required and automation can also be achieved.
Accordingly, the grounding wire
123
of the shielded wire
120
is thus caused to branch so that a noise flowing through the core wire
120
c
can be caused to escape from the braided wire
120
d
toward the ground through the conductive wire
123
a
of the grounding wire
123
.
In such a wire branch processing, however, the shielding cover of the shielded wire
120
is the braided wire
120
d.
Therefore, the contact of the braided wire
120
d
with the conductive wire
123
a
has a relationship in which the surfaces of sectional circular lines come in contact with each other and their contact area is decreased so that their connecting reliability is deteriorated as shown in FIG.
19
.
Moreover, the contact area of the braided wire
120
d
and the conductive wire
123
a
is decreased so that the amount of escaped noise is reduced. Consequently, a drain wire (not shown) is provided in the shielded wire
120
to maintain the amount of escape of the noise. In this case, it is necessary to additionally provide the drain wire. Therefore, the number of members is increased with a complexity of the structure so that the cost of the shielded wire
120
is increased, and furthermore, a weight becomes greater.
In the branching structure, the single core type shielded wire
120
can be properly shielded. However, if the same structure is applied to a multicore type shielded wire having a different internal configuration, the following drawbacks would be occurred.
More specifically, a multicore shielded wire has such a structure that a plurality of shielded core wires are accommodated with a clearance in the internal space of an insulating outer sheath and a braided wire. For this reason, the degree of a close contact and the arrangement relationship between the braided wire and the shielded core wires are indefinite with an interposition between the resin members
121
and
122
. In some cases in which the degree of a close contact is excessive, the insulating inner sheath of the shielded core wire is broken or cut upon receipt of the transmission of great vibration energy. Consequently, the grounding wire or the shielding cover comes in contact with the core to cause a short circuit, and furthermore, the strength of the multicore shielded wire is reduced.
In order to eliminate such a drawback, it can be proposed that the vibration energy to be applied by the ultrasonic vibration is reduced. However, in such a condition, a bonding strength based on the fusion and solidification between the resin members
121
and
122
is accordingly reduced.
SUMMARY OF THE INVENTION
It is therefore a first object of the present invention to provide a structure and a method for branching a shielded wire in which the connecting reliability of a branch wire branched from the shielded wire can be enhanced and the structure can be simplified to decrease the number of members.
It is a second object of the invention to provide a structure and a method for branching a multicore shielded wire in which a pair of resin members can be connected firmly, and furthermore, a short circuit can be prevented from being caused by the contact of a grounding wire or a shielding cover with a core wire so that th
Asakura Nobuyuki
Ide Tetsuro
Mita Akira
Nguyen Chau N.
Sughrue & Mion, PLLC
Yazaki -Corporation
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