Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-01-17
2002-09-17
Martin, David (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C174S1170FF, C174S034000
Reexamination Certificate
active
06452812
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
The present application is based on Japanese Patent Application No. 2001-8361, the entire contents of which are incorporated herein by reference.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electromagnetic wave shielding structure for connecting multiple shielded wires to a conductive ground member.
2. Related Art
To connect a power feed cable or control signal cable to an arbitrary electric device, including a motor mounted in a vehicle such as an electric car, normally, electromagnetic wave shielding is required. Electromagnetic wave shielding is performed in order to prevent the destabilization of the operation of the electric device due to various types of electrical noise.
A conventional electromagnetic wave shielding structure will now be explained while referring to
FIGS. 6 and 7
. For this shielding multiple shielded wires
101
are employed. These wires
101
are connected to a conductive ground member
105
, such as a motor case, by multiple terminals
102
that are connected to the braided shields of the respective shielded wires
101
, and a first holder
103
and a second holder
104
between which the terminals
102
are cramped. By using this arrangement, electromagnetic wave shielding can be provided.
The individual components will now be described. Each shielded wire
101
consists of a core line
106
surrounded by an insulating cover
107
and overlaid by a braided shield (not shown), and an outer cover
108
that encloses the braided shield (see FIG.
7
). The shielded wire
101
obtained by the terminal process is employed, and a LAN terminal
109
is connected to the core line
106
through the terminal process. Further, the terminals
102
are connected to the braided shields (not shown).
Each of the terminals
102
includes a main terminal body
110
and a ring member
111
, while an annular portion
112
and a braided shield folding portion (not shown) are formed for the main terminal body
110
. The annular portion
112
is cramped by the first holder
103
and the second holder
104
, and the braided shield (not shown) is folded over the braided shield folding portion (not shown). The ring member
111
is inserted into the outside of the folded over braided shield (not shown), and is caulked at a plurality of positions using a caulking device (not shown).
The fist holder
103
, which is conductive, includes: a pair of fixed portions
113
, which are securely connected to the grounding member
105
; three electric contact portions
114
, which have a spring property and which are formed into an arched shape; connecting portions
115
, which are located between the fixed portions
113
and the electric contact portions
114
; and flat connecting portions
116
, which are located between the electric contact portions
114
. Bolt through holes
17
are formed in the fixed potions
113
and the connecting portions
115
are formed by bending the fixed portions
113
and the electric contact portions
114
, while the connecting portions
116
are formed parallel to the grounding member
105
.
The second holder
104
, which is conductive, includes: a pair of fixed potions
118
, which are lapped over the fixed portions
113
of the first holder
103
; three arched pressing portions
119
, which press the terminals
102
against the corresponding electric contact portions
114
; connecting portions
120
, which are formed between the fixed portions
118
and the pressing portions
119
; and flat connecting portions
121
, which are formed between the pressure portions
119
. Further, bolt through holes
123
are formed in the fixed portions
118
for the insertion of the bolts
122
, and the pressing portions
119
have a curvature greater than that of the annular portions
112
of the terminals
102
.
With this arrangement, the bolts
122
are inserted through the bolt through holes
123
and
117
and engage the grounding member
105
. Then, the respective terminals
102
are cramped between the pressing portions
19
and the electric contact portions
114
, and the shielded wires
101
are connected to the ground member
105
. In this manner, electromagnetic wave shielding is provided.
According to the conventional technique, however, the following four problems with the second holder
104
have arisen.
Since the pressing portions
119
are arched and have a curvature greater than that provided for the annular portions
112
of the terminals
102
, when due to a specific factor an external force is applied to the terminals
102
in the direction indicated by an arrow P in
FIG. 8
, that is, widthwise relative to the terminals
102
. The terminals
102
, which are held so that they closely contact the electric contact portions
114
by the spring force thereof, may be shifted from their predetermined locations (since each terminal
102
respectively contacts, at only one location each, the electric contact portion
114
and the pressing portion
119
, a terminal
102
may be shifted from its predetermined location upon the application of an external force in the direction indicated by the arrow P).
Further, since the pressing portions
119
are simply curved, when due to a specific factor the external force is exerted on the terminals
102
in the direction indicated by an arrow Q in
FIG. 9
, which is the longitudinal direction of the terminal
102
, the terminals
102
may also be shifted in the direction indicated by the arrow Q.
In addition, since the contact load imposed on the terminals
102
and the electric contact portions
114
must be equalized, forming the pressing portion
19
into the arched shape required to press the terminals
102
against the electric contact portions
114
is not easy. As a result, this has an adverse effect on the manufacturing costs.
Furthermore, since a satisfactory rigidity is required to press the terminals
102
against the electric contact portions
114
, the thicknesses of the members are increased.
SUMMARY OF THE INVENTION
To solve the above shortcomings, it is one objective of the present invention to provide an electromagnetic wave shielding structure that can prevent the shifting of grounding terminals that are cramped between a first holder and a second holder, and that can reduce both the manufacturing costs of a second holder and the weight thereof.
To achieve the above objective, according to a first aspect of the invention, there is provided an electromagnetic wave shielding structure comprising: A shielded wire; a terminal connected to a braided shield of the shielded wire, the terminal is cramped between a first holder and a second holder; the first holder including electric contact portion; the second holder including pressing portion, the pressing portion having a pair of first position regulators and a pair of second position regulators; and a conductive ground member provided so that the shielded wire is connected to the conductive ground member through the terminal and the first holder and the second holder, wherein the electric contact portion contacts the terminal, and the pressing portion presses the terminal against the electric contact portion, and wherein the pair of first regulators contact an outer wall of the terminal in the widthwise direction of the terminal at two places, and a pair of second position regulators contact both ends of the terminal in the longitudinal direction of the terminal.
According to a second aspect of the invention, for the electromagnetic wave shielding structure of the first aspect, the pressing portion is formed in a plate shape.
According to a third aspect of the invention, for the electromagnetic wave shielding structure of the second aspect, a reinforcement rib is formed on the pressing portion.
According to a fourth aspect of the invention, for the electromagnetic wave shielding structure of the first aspect, the pressing portion is provided with a substantially rectangular opening and the pair of first position regulators and the pair of second regulators are formed at e
Hotta Daiji
Ikeda Tomohiro
Saito Satoshi
Shiraki Kazuyuki
Wakui Masanori
Martin David
Phan Thanh S.
Yazaki -Corporation
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