Electrical connectors – With vitreous-type envelope – Having bayonet-coupling contact
Reexamination Certificate
2001-03-06
2002-10-15
Ta, Tho D. (Department: 2833)
Electrical connectors
With vitreous-type envelope
Having bayonet-coupling contact
C439S065000, C439S095000, C439S101000, C439S386000
Reexamination Certificate
active
06464538
ABSTRACT:
BACKGROUND OF THE INVENTION
1. (Field of the Invention)
The present invention relates to a shield connector to be used for accommodating a terminal of a shielding electric wire.
Further, the present invention relates to a device for connecting a terminal of a shielding electric wire to a terminal provided in an apparatus.
2. (Related Art)
The present applicant has developed a shield connector using an aluminum die cast part as a shield countermeasure part in order to mainly enhance a shield performance and has disclosed Japanese Patent Application No. Hei 11-235984 filed earlier, for example. The shield connector is typically shown in FIG.
6
.
More specifically, a connector body to be fixed to a shield wall such as an electric apparatus is molded through an aluminum die cast, a cylindrical housing portion
1
is formed in the connector body, and a contact
2
taking the shape of a double enveloping louver is fitted and attached into the housing portion
1
. On the other hand, a shield layer
4
comprising a braided wire is exposed to a terminal of a shielding electric wire
3
and is wound upon a terminal of a sheath
5
, and furthermore, a terminal fixture
7
is connected to a core
6
. The terminal fixture
7
is inserted into the contact
2
so that the shield layer
4
is elastically pressed into the inner periphery of the contact
2
. Consequently, the shield layer
4
is conducted to the housing portion
1
, and furthermore, a shield wall through the contact
2
.
With such a structure, the terminal of the shielding electric wire
3
is wholly surrounded without a clearance by the cylindrical housing portion
1
formed of an aluminum die cast. Therefore, an excellent shield performance can be displayed.
(Problems to be Solved)
In order to display the shield performance in the structure described above, it is necessary to take an electrical connection from the terminal of the shield layer
4
in the shielding electric wire
3
to the contact
2
and the housing portion
1
. However, the aluminum die cast tends to form an oxide coat on a surface thereof, and the oxide coat acts as an insulating layer. Consequently, the electrical connection between the contact
2
and the housing portion
1
tends to be unstable.
For this reason, conventionally, the internal surface of the aluminum die cast, that is, the housing portion
1
has been subjected to tinning, thereby enhancing connecting stability. However, since a material is aluminum, it is necessary to carry out the tinning again after copper plating is performed. Consequently, there has been a problem in that a manufacturing cost is increased. Therefore, further improvement has been desired eagerly.
The invention has been completed based on the demand described above and has an object to provide a shield connector capable of obtaining a reliable shield performance at a low cost.
(Related Art)
Further, conventionally, a structure shown in
FIG. 13
has been employed in a portion where a terminal of a motor cable comprising a shielding electric wire is connected to a stator terminal of a motor. More specifically, in a terminal of a motor cable
101
, a shield cylinder
102
is fitted into a terminal of a shield layer
101
A comprising a braided wire and a ground portion
102
A is overhung over the outer periphery thereof, and furthermore, a seal ring
102
B is fitted into the front end side and a terminal fixture
103
is connected to a core
101
B. On the other hand, a fixing hole
105
is opened on a case
104
A of a motor
104
. The terminal fixture
103
formed on a tip of the motor cable
101
is inserted into the motor case
104
A through the fixing hole
105
and is connected to a stator terminal
107
with a bolt
106
. In addition, a seal ring
102
B of the shield cylinder
102
is tightly fitted in the fixing hole
105
to obtain a waterproofing property. Moreover, the ground portion
102
A of the shield cylinder
102
is fixed to the motor case
104
A with a bolt
108
to take a ground. Consequently, an electromagnetic shielding structure can be obtained.
(Problems to be Solved)
In other words, conventionally, the terminal of the motor cable
101
has been directly connected to the stator terminal
107
through the motor case
104
A. Therefore, a work for connecting the motor cable
101
is to be carried out together with a step of assembling the motor
104
into a vehicle. Consequently, the degree of freedom of the assembling step is restricted. Moreover, also in the case in which the motor cable
101
is to be exchanged for maintenance, it is necessary to disassemble the motor
104
from the vehicle, which is complicated.
The invention has been completed in consideration of the circumstances and has an object to increase the degree of freedom of the assembling step and to enhance maintenance properties.
SUMMARY OF THE INVENTION
(Means for Solving the Problems)
In order to achieve the above object, a first aspect of the invention is directed to a shield connector comprising a cylindrical housing portion formed of an aluminum die cast, a contact being fitted and attached into the housing portion and a shield member provided on a terminal of a shielding electric wire being caused to elastically come in contact with the contact, wherein the contact is fixed to the housing portion with a bolt.
A second aspect of the invention is directed to the shield connector according to the first aspect of the invention, wherein the contact is elastically deformable and cylindrical and the shield member of the terminal of the shielding electric wire can be fitted into the contact, and the contact is provided with a fixing portion extended from an edge in an axial direction thereof, the fixing portion being provided with an inserting hole for inserting the bolt to be screwed to a screw hole threaded in the housing portion.
Further, in order to achieve the above object described above, a third aspect of the invention is directed to a terminal connecting device for a shielding electric wire which serves to connect a terminal of a shielding electric wire to a terminal provided in an apparatus, wherein a shield case is fixed to an outer surface of the apparatus and one of ends of a conducting path having the other end connected to the terminal faces an inside of the shield case, the terminal of the shielding electric wire is inserted into an inserting portion formed on a side surface of the shield case so that a shield member provided on the terminal comes in contact with the inserting portion, and a terminal of a core of the shielding electric wire and the other end of the conducting path are coupled to each other on an insulating terminal board provided in the shield case.
A fourth aspect of the invention is directed to the terminal connecting device for a shielding electric wire according to the third aspect of the invention, wherein an operation opening is formed on a side surface corresponding to an outside of a portion in the shield case where the terminal board is provided, and a cover is removably put over the operation opening.
A fifth aspect of the invention is directed to the terminal connecting device for a shielding electric wire according to the third or fourth aspect of the invention, wherein the conducting path is formed of a bus bar.
(Function of the Invention)
<The Invention According to Aspect 1>
The contact is fixed to the housing portion through bolt fastening. The contact is pressed against the housing portion at a high contact pressure. Therefore, a conducting path for the contact—the bolt—the housing portion is constructed so that a reliable electrical connection between the contact and the bolt can be obtained.
More specifically, the plating is required to reduce the cost. Consequently, a reliable shield performance can be obtained.
<The Invention According to Aspect 2>
The contact is fixed by inserting the bolt into the inserting hole of the fixing portion and screwing the bolt into the screw hole of the housing portion. The fixing portion extended from the contact is fixed with the bolt. Therefo
Ito Keiichi
Iwakawa Hidehiko
Miyazaki Sho
Shiraki Kazuyuki
Wakui Masanori
Autonetworks Technologies Ltd.
Nguyen Truc
Oliff & Berridg,e PLC
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