Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
2002-04-24
2004-01-06
Mayd, III, William H. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
C174S09400S
Reexamination Certificate
active
06674007
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to the shielding method and structure for a multicore shielded wire for electrically connecting a shielding cover of the multicore shielded wire and a grounding wire.
A related shield processing structure is disclosed in Japanese Patent Publication No. 11-135167A as shown in
FIGS. 8 and 9
.
In the branching structure shown in these figures, 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
butted 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 branching 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 thereabove, one end of the grounding wire
123
is mounted thereon, and furthermore, the upper resin member
121
is put 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 complicated manual work is not required and automation can also be achieved.
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 occur.
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 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 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 an object of the invention to provide a structure and a method for shielding a multicore shielded wire in which 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 the strength of the multicore shielded wire can be prevented from being reduced.
In order to achieve the above object, according to the present invention, there is provided a multicore shielded wire, comprising:
a plurality of shielded core wires, each having a first diameter;
a conductive cover member, which covers the shielded core wires;
a first insulating sheath, which covers the conductive cover member; and
a pair of resin members, each formed with a groove having a semi-ellipsoidal shape and thermally integrated with each other for forming an ellipsoidal through hole while accommodating the first insulating sheath therein,
wherein a major axis length of a cross section of the ellipsoidal through hole is substantially identical with a length obtained by adding each first diameter, twice a thickness of the conductive cover member and twice a thickness of the first insulating sheath; and
wherein a minor axis length of a cross section of the ellipsoidal through hole is substantially identical with a length obtained by adding the first diameter, twice the thickness of the conductive cover member and twice the thickness of the first insulating sheath.
Preferably, the multicore shielded wire further comprises a branch wire, in which a conductive core wire is covered with a second insulating sheath, the branch wire sandwiched between the first insulating sheath and one of the resin members. A part of the first insulating sheath and a part of the second insulating sheath are thermally fused so that the conductive cover member and the conductive core wire are electrically connected.
In order to attain the same advantages, according to the present invention, there is also provided a multicore shielded wire, comprising:
a plurality of shielded core wires, each having a first diameter;
at least one drain wire, having a second diameter which is smaller than the first diameter;
a conductive cover member, which covers the shielded core wires and the drain wire;
a first insulating sheath, which covers the conductive cover member, and
a pair of resin members, each formed with a groove having a semi-ellipsoidal shape and thermally integrated with each other for forming an ellipsoidal through hole while accommodating the first insulating sheath therein,
wherein a major axis length of a cross section of the ellipsoidal through hole is substantially identical with a length obtained by adding each first diameter, the second diameter, twice a thickness of the conductive cover member and twice a thickness of the first insulating sheath; and
wherein a minor axis length of a cross section of the ellipsoidal through hole is substantially identi
Asakura Nobuyuki
Ide Tetsuro
Mita Akira
Mayd, III William H.
Yazaki -Corporation
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