Electricity: conductors and insulators – Conduits – cables or conductors – Combined
Reexamination Certificate
1999-10-12
2001-07-17
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Conduits, cables or conductors
Combined
C174S078000
Reexamination Certificate
active
06262374
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a shielded cable connecting structure applied to various electrical equipment such as motors in an electrical vehicle, and more particularly to a shield cable connecting structure which provides both a shielded connection and waterproofing.
2. Description of the Related Art
When making connections of high-voltage cables to motors or making connections to control signal cables in electrical vehicles, for example, it is necessary to provide both electromagnetic shielding and waterproofness. This electromagnetic shielding is done to avoid unstable motor operation caused by various types of noise, and waterproofing is done to prevent the intrusion of corrosion damage to electrical contact parts by the intrusion of rain moisture into the motor via the shielded cable.
A shielded cable connecting structure that provides electromagnetic shielding and waterproofing is disclosed in the Japanese laid open patent application publication H10-112924, which is illustrated in FIG.
1
and
FIG. 2A and 2B
. As shown in
FIG. 1
, the shielded cable connecting structure makes connection to the braid
6
a
of the shielded cable
6
, via a substantially cylindrical housing
3
, a bolt
4
, and a shield connection ring
5
that serves as a shield connection member within a cable insertion hole
2
a
in the motor case
2
of the main equipment to which connection is made. That is, the outer peripheral surface
3
a
of the housing
3
is fitted into the cable insertion hole
2
a
of the motor case, a mounting flange
3
b
used for this purpose being held fast by the bolt
4
, so that the housing
3
through which the shielded cable
6
is inserted in mounted to the motor case
2
.
As shown in FIG.
2
A and
FIG. 2B
, the braid
6
a
of the shielded cable
6
, which is inserted into the housing
3
is folded back onto a peripheral depression at the end of the housing
3
, this folded-back braid
6
a
being sandwiched by the shield connection ring
5
that is fitted over the peripheral depression
3
c
at the end of the housing
3
. This shield connection ring
5
is made of a metal having good resilience, and is formed so to have a gap opening in its center, the folded-back braid
6
a
of the shielded cable
6
being freely held in place to prevent the pulling out thereof, by a plurality of spring places
3
a
and a fang piece
5
b
. Additionally, each of the spring pieces
5
a
of the shield ring
5
is in resilient contact with the cable insertion hole
2
a
of the motor case
2
. According to this configuration, the braid
6
a
of the shielded cable
6
is grounded via the motor case
2
.
The annular groove
3
d
formed at the outer peripheral surface
3
a
of the housing
3
has an O-ring
7
that fitted therein, which provide an intimate seal between the housing
3
and the motor case
2
. Additionally, a substantially cylindrically shaped waterproof cover
8
is inserted between the outer insulation covering
6
b
of the shielded cable
6
and the housing
3
. The above-noted O-ring
7
and waterproof cover
8
reliably prevent the intrusion of rain moisture into the motor case
2
from the outside. The shielded cable
6
, which is inserted through a corrugated tube
9
, is inserted into the cable insertion hole
2
a
of the housing
2
. Additionally, the inner conductor
6
d
which is exposed from the inner insulation covering
6
c
of the shielded cable
6
has crimped onto it a connection terminal (not shown in the drawing) that makes connection with a motor terminal (not shown in the drawing).
Art similar the above-noted shielded cable connecting structure is disclosed, for example, in the Japanese laid-open patent application publication H9-180824.
In the above-described shielded cable connecting structure
1
, however, because the spring force of the shield connection ring
5
in used to make a connection between the cable insertion hole
2
a
of the motor case
2
and the braid
6
a
of the shielded cable
6
, fatiguing of the spring characteristics of the shield connection ring
5
with the passage of time and other phenomena lead to the danger of a deterioration of the shielding characteristics Additionally, because the same surface of the cable insertion hole
2
a
of the motor case
2
serves as the surface that shields the braid
6
a
and the waterproofing surface that makes contact with the O-ring
7
, when mounting the housing
3
to the motor case using the bolt
4
, there was a danger of damaging this waterproofing surface, thereby causing a worsening of waterproofness. Additionally, because the housing
3
is mounted to the motor case
2
via the flange
3
b
and the bolt
4
, it is absolutely necessary to provide sufficient space for mounting, thereby causing an increase in size of the overall structure.
Accordingly it is an object of the present invention to solve the problems described above in the related art, by providing a shielded cable connecting structure that provides reliable shield connection and waterproofness, and which also enables an overall savings in space.
SUMMARY OF THE INVENTION
To achieve the above-noted object, a first aspect of the present invention is a shielded cable connecting structure provided with a cable insertion hole, for passage of the shielded cable, at a prescribed position on the equipment to be connected, wherein the braid of a shielded cable passed through this cable insertion hole is connected to a prescribed position of the cable insertion hole, via a shield connection member, this shielded cable connecting structure having a shield connection part and a female thread part inside the shielded cable insertion hole, the shield connection member to which is connected the braid of the shielded cable, via a hollow pressure member through which the shielded cable passes, being connected to the shield connection part, a hollow bolt through which the shielded cable passes being screwed into the female thread of the cable insertion hole, with the tightening of this bolt acting to freely press the shield connection member in the direction that presses it up against the shield connection part of the cable insertion hole.
According to the above-noted shielded cable connecting structure, because the tightening of a hollow bolt through which the shielded cable is passed acts to press a hollow pressure member, thereby causing the shield connection member that is connected to the braid of the shielded cable to make contact with the shield connection part of the cable insertion hole, the shield connection between the equipment and the braid of the shielded cable is reliably made, and shielding performance is improved. Additionally, because a hollow bolt is tightened into a female thread that is provided concentrically with the cable insertion hole of the equipment to which connection is to be made, so as to mike a shield connection between the equipment and the braid of the shielded cable, it is possible to achieve a space savings in the shielded cable connecting structure, thereby making the overall structure more compact.
A second aspect of the present invention is a variation of the first aspect described above, this variation having a shield connection member housing part for housing the shield connection member in the cable insertion hole, an inclined part being provided on the shield connection part side of the boundary between this shield connection member housing part and the shield connection part, an inclined part of the shield connection member being caused to press against this inclined part.
According to the above-noted shielded cable connecting structure, because a hollow pressure member that is pressed by the tightening of the bolt through which the shielded cable passes acts to make a reliable contact between the inclined part of the shield connection member, to which is connected the braid of the shielded cable, and the inclined part of the shield connecting member of the cable insertion hole, the shield connection between the equipment and the braid o
Deno Masahiro
Hamada Haruki
Hirai Toshihiro
Ishizaki Kazuhisa
Matsumoto Mitsuhiro
Finnegan Henderson Farabow Garrett & Dunner L.L.P.
Mayo, III William H
Reichard Dean A.
Yazaki -Corporation
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