Information
-
Patent Grant
-
6244898
-
Patent Number
6,244,898
-
Date Filed
Thursday, August 24, 200023 years ago
-
Date Issued
Tuesday, June 12, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
- Bradley; Paula
- Ta; Tho D.
Agents
- Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
-
CPC
-
US Classifications
Field of Search
US
- 439 587
- 439 589
- 439 271
- 439 274
- 439 275
- 439 279
-
International Classifications
-
Abstract
A waterproof connector 1 includes: a plurality of terminal accommodating chambers 4, 6A arranged in the vertical and the traverse direction of a connector housing 2; and a plurality of rubber plug accommodating chambers 6B communicated with the terminal accommodating chambers 6A, wherein a rubber plug 8 in which an electrical wire insertion hole 8a is formed is arranged in each rubber plug accommodating chamber 6B, a terminal 9 connected with an electrical wire W is capable of being freely accommodated in each terminal accommodating chamber 4, 6A, a plug material injection port 7A, plug material path 7B and vent hole 7C are serially formed in each row of the rubber plug accommodating chambers 6B in one of the vertical and the traverse direction of the peripheral wall 5d and the partition wall 5e which form the rubber plug accommodating chambers 6B of the connector housing, plug material is injected into the rubber plug accommodating chambers 6B of each row from the plug material injection port 7A of each row so as to integrally form rubber plugs 8 in which electrical wire insertion holes 8a having a plurality of sealing portions 8b closely coming into contact with the outer circumferences of the electrical wires W are formed.
Description
BACKGROUND OF THE INVENTION
1. Technical Field
The present invention relates to a small multipolar waterproof connector in which the waterproof property is enhanced between a connector housing and a plurality of electrical wires connected with terminals.
2. Related Art
FIG. 9
shows one type of waterproof connector. A connector housing
102
of this waterproof connector
101
has formed therein a plurality of terminal accommodating chambers
103
each of which forms at its rear portion an electric wire sealing chamber
104
so that the sealing chamber
104
is communicated therewith. Also, each terminal accommodating chamber
3
accommodates a female terminal
106
having an electric wire connected thereto with the female terminal
106
being engaged with a lance (flexible engaging arm)
107
. Further, each terminal accommodating chamber
103
and its corresponding electric wire
105
are sealed by a rubber plug
108
forced into the electric wire sealing chamber
104
.
It is to be noted that similar techniques regarding the waterproof connector
101
are disclosed in Japanese Patent Examined Publication No. Hei. 5-65996 and Japanese Patent Unexamined Publication No. Hei. 1-213973.
However, in the above-described waterproof connector
101
, as shown in
FIG. 10
, the diameter L of the electric wire sealing chamber
104
must be made larger than the diameter of the terminal accommodating chamber
103
for the purpose of mold releasing or terminal insertion. Therefore, the terminal-to-terminal pitch X is limited with the result that the connector housing
102
has become large in size. Also, since the rubber plug
108
is exposed from a rear surface side of the connector housing
102
to the outside, the rubber plug
108
is damaged or deformed during high-tension cleaning or due to contact therewith of a machine tool or the like, with the result that a desired level of sealing performance was not obtained.
SUMMARY OF THE INVENTION
The present invention has been achieved with such points in mind.
It therefore is an object of the present invention to provide a multi-polar waterproof connector which enables the miniaturization of the connector housing as well as the enhancement of the sealability and assemblability thereof and a method of assembling the same.
To achieve the object, according to a first aspect of the present invention, there is provided a waterproof connector including: an inner housing having formed therein terminal accommodating chamber in which terminals to which electric wires are to be connected are accommodated; rubber plugs for sealing the electric wires, the rubber plugs having formed therein holes through which the electric wires are inserted and passed; and an outer housing into which the inner housing is fitted, an one wall portion of the outer housing opposing to the terminal accommodating chambers being formed with electric wire insertion and passing holes into which the electric wires are inserted and passed, an inside portion of the one wall portion of the outer housing corresponding to the electric wire insertion and passing holes being formed with rubber plug accommodating recessed portions for accommodating therein the rubber plugs, wherein the electric wires that have been inserted and passed through the electric wire insertion and passing holes and the holes of the rubber plugs are connected to the terminals which are accommodated in the terminal accommodating chambers.
In this waterproof connector, since the diameter of the rubber plug accommodating recessed portions of the outer housing can be minimized irrespective of the size of the terminal accommodating chambers of the inner housing, the terminal-to-terminal's pitch becomes small with the result that it is possible to miniaturize a multipolar connector housing (which is composed of the inner housing and the outer housing). Also, since the rubber plugs are not exposed to the outside from the one wall portion of the outer housing, the degradation of the sealing performance of the rubber plugs due to an external force does not occur, with the result that the reliability on the waterproofness effected with the rubber plugs is enhanced.
According to a second aspect of the present invention, as it depends from the first aspect, there is provided a waterproof connector wherein, a tapered surface is formed on an inlet side of the rubber plug accommodating recessed portion; a tapered surface is formed on each side of the rubber plug; and a rubber plug guiding portion to guide the rubber plug is formed at a position of the inner housing corresponding to the tapered surface of the rubber plug.
In this waterproof connector, the rubber plug guiding portion off the inner housing, the tapered surface on an inlet side of the rubber plug accommodating recessed portion of the outer housing, the tapered surface of the rubber plug, and the electric wire serve and operate as guides, whereby the rubber plug is accommodated reliably in a simple way in the rubber plug accommodating recessed portion of the outer housing. As a result, the reliability on the waterproofness effected with the rubber plugs is further enhanced.
According to a third aspect of the present invention, there is provided a method of assembling a waterproof connector including the steps of: inserting and setting rubber plugs for sealing the electric wires in rubber plug accommodating recessed portions formed in an inside portion of a one wall portion of an outer housing; inserting and passing the electric wires into and through electric wire insertion and passing holes formed in the outer housing at the positions of the one wall portion opposed to the terminal accommodating chambers; inserting and passing the electric wires which are passing through the electric wire insertion and passing holes into and through holes which are formed in the rubber plugs; connecting the electric wires passed through the holes of the rubber plugs to the terminals accommodated in the terminal accommodating chambers; and fitting the inner housing into the outer housing.
In this method of assembling a waterproof connector, a small-in-size and multipolar waterproof connector having excellent waterproofness is assembled smoothly in a simple way and in a short time.
The invention provides a waterproof connector including: a plurality of terminal accommodating chambers arranged in the vertical and the traverse direction of a connector housing; and a plurality of rubber plug accommodating chambers communicated with the terminal accommodating chambers, wherein a rubber plug in which an electrical wire insertion hole is formed is arranged in each rubber plug accommodating chamber, a terminal connected with an electrical wire is capable of being freely accommodated in each terminal accommodating chamber, each terminal accommodating. chamber and an electrical wire are sealed by the rubber plug, a plug material injection port, plug material path and vent hole are serially formed in each row of the rubber plug accommodating chambers in one of the vertical and the traverse direction of the peripheral wall and the partition wall which form the rubber plug accommodating chambers of the connector housing, plug material is injected into the rubber plug accommodating chambers of each row from the plug material injection port of each row so as to integrally form rubber plugs in which electrical wire insertion holes having a plurality of sealing portions closely coming into contact with the outer circumferences of the electrical wires are formed.
In this waterproof connector, plug material is injected into each rubber plug accommodating chamber of each row from the plug material injection port of each row, so that the rubber plug can be integrally formed in which an electrical wire insertion port having a plurality of sealing portions tightly coming into contact with the outer circumference of the electrical wire is integrally formed. Therefore, no workers forget to attach the rubber plugs, and sealing can be positively made between each rubber plug accommodating chamber of the connector housing and the rubber plug and also between the rubber plug and the electrical wire. Therefore, the waterproof performance and the waterproof reliability can be enhanced. Due to the foregoing, it becomes unnecessary to provide a process in which the rubber plug is attached to the connector housing when the waterproof connector is assembled. Therefore, the multipolar waterproof connector, the sealing property of which is high, can be assembled in a short period of time, and the entire assembling property can be more enhanced.
The invention provides a waterproof connector wherein the positions of the plurality of sealing portions arranged in the electrical wire insertion holes of the rubber plugs integrally formed in the rubber plug accommodating chambers in each row are arranged so that they can not be the same as the positions of the plug material injection ports, plug material paths and vent holes in each row.
In this waterproof connector, the positions of a plurality of sealing portions in the electrical wire insertion holes of the rubber plugs integrally formed in the rubber plug accommodating chambers in each row are made different from the positions of the plug. material injection ports of each row. Therefore, it is possible to prevent the deterioration of the waterproof performance with respect to a plurality of sealing portions in the electrical wire insertion holes of the rubber plug. Accordingly, the waterproof performance and the waterproof reliability of the waterproof connector can be more enhanced.
The present invention provides a waterproof connector:
a connector housing;
a terminal accommodating chamber provided in the connector housing; and
a rubber plug accommodating chamber provided in the connector housing and adapted to pass a wire therethrough, one open end of the rubber plug accommodating chamber being connected to the terminal accommodating chamber, the other open end of the rubber plug accommodating chamber being communicated with an exterior of the connector housing so that the rubber plug accommodating chamber communicates an interior of the connector housing with the exterior via the terminal accommodating chamber, the rubber plug accommodating chamber including,
two ports provided at a portion between the one open end and the other open end to communicate an interior of the rubber plug accommodating chamber with an exterior of the rubber plug accommodating chamber and located opposite from each other with respect to the rubber plug accommodating chamber, and
a rubber plug accommodated in the rubber plug accommodating chamber and the ports, and adapted to seal the terminal accommodating chamber and the wire passed through the rubber plug accommodating chamber.
The present invention provides a method of providing waterproof characteristic to a waterproof connector made of resin material, the connector including: a connector housing; a terminal accommodating chamber provided in the connector housing; and a rubber plug accommodating chamber provided in the connector housing and communicated with the terminal accommodating chamber, the method including the steps of:
providing a port communicated with an interior of the rubber plug accommodating chamber setting a rubber forming mold in the rubber plug accommodating chamber;
injecting molten rubber material from the port to a space defined by the rubber plug accommodating chamber and the rubber forming mold to mold a rubber plug in the rubber plug accommodating chamber; and
removing the rubber forming mold from the rubber plug accommodating chamber.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG.
1
(
a
) is a cross-sectional view showing a state before the waterproof connector of an embodiment of the present invention is assembled.
FIG.
1
(
b
) is a cross-sectional view showing a state after the waterproof connector of an embodiment of the present invention has been assembled.
FIG. 2
is a cross-sectional view showing an outer housing used for the waterproof connector.
FIG. 3
is a cross-sectional view showing a state in which a rubber plug is molded integrally with the outer housing.
FIG. 4
is a rear view showing an outer housing with which the rubber plug is integrally molded.
FIG.
5
(
a
) is a partially cross-sectional view of a primary portion of an outer housing with which the rubber plug is integrally formed.
FIG.
5
(
b
) is a partially cross-sectional view of a comparative example of the primary portion.
FIG. 6
is a cross-sectional view showing a state before a waterproof connector of the present invention is assembled.
FIG. 7
is a partially cross-sectional perspective view showing a state before the waterproof connector of the present invention is assembled.
FIG.
8
(
a
) is a cross-sectional view showing a state before the waterproof connector of the present invention is assembled.
FIG.
8
(
b
) is a cross-sectional view showing a state in which a spacer is engaged with an outer housing of the waterproof connector.
FIG.
8
(
c
) is a cross-sectional view showing a state in which an electrical wire is penetrated through the outer housing and spacer.
FIG.
8
(
d
) is a cross-sectional view showing a state in which the electrical wire is connected with a terminal accommodated in a terminal accommodating chamber of an inner housing.
FIG.
8
(
e
) is a cross-sectional view showing a state in which the waterproof connector has been assembled.
FIG. 9
is a sectional view showing a conventional example of a waterproof connector.
FIG. 10
is an explanatory view showing the pitch between terminals of the conventional waterproof connector.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENT
Referring to the drawings, an embodiment of the present invention will be explained below.
First embodiment
FIG. 6
is a cross-sectional view showing a state before a waterproof connector of an first embodiment of the present invention is assembled.
FIG. 7
is a partially cross-sectional perspective view showing a state before the waterproof connector is assembled. FIG.
8
(
a
) is a cross-sectional view showing a state before the waterproof connector is assembled. FIG.
8
(
b
) is a cross-sectional view showing a state in which a spacer is engaged with an outer housing of the waterproof connector. FIG.
8
(
c
) is a cross-sectional view showing a state in which an electrical wire is penetrated through the outer housing and spacer. FIG.
8
(
d
) is a cross-sectional view showing a state in which the electrical wire is connected with a terminal accommodated in a terminal accommodating chamber of an inner housing. FIG.
8
(
e
) is a cross-sectional view showing a state in which the waterproof connector has been assembled.
As shown in
FIGS. 6
to
8
, the connector housing
11
of the waterproof connector
10
includes: an inner housing
12
made of synthetic resin in which a plurality of terminal accommodating chambers
13
are integrally formed; an outer housing
17
made of synthetic resin into which this inner housing
12
is inserted; and a spacer
28
made of synthetic resin, which is interposed between the inner housing
12
and the outer housing
17
, for holding the female terminals
14
accommodated in the terminal accommodating chambers
13
of the inner housing
12
.
As shown in
FIGS. 6 and 7
, the inner housing
12
has a box section
12
a
, the upper and the lower face on the rear side thereof are respectively open. In the inner housing
12
, the terminal accommodating chambers
13
are formed in a space which is formed by the horizontal wall
12
b
at the center and the vertical side walls
12
c
which are also used as partition walls. A female terminals
14
are accommodated in these terminal accommodating chambers
13
, respectively. The engaging claws
15
are integrally protruded from both sides and the center of the upper and the lower face of the box section
12
a
. Further, the flange sections
16
are integrally protruded from the front end on both sides at the center. A rectangular insertion hole
12
d
is formed at a position opposed to each terminal accommodating chamber
13
on the front wall of the box
12
a
. A male terminal of the opponent connector not shown is inserted into the rectangular insertion hole
12
d
. Further, a pair of pressure-contact blades
14
b
,
14
b
are formed by bend on both side plates at the rear of the box section
14
a
of the female terminal
14
.
As shown in
FIGS. 6 and 7
, the outer housing
17
includes: an inner wall section
17
a
shaped a substantially square cylinder; an outer wall section
17
b
shaped substantially a square cylinder and enclosing the inner wall section
17
a
; and a bottom wall section
17
c
for connecting the rear sections of the inner wall section
17
a
and the outer wall section
17
b
, wherein the outer housing
17
is formed into a double-box-shape, the front side of which is open. The center of this bottom wall section
17
c
forms a thick section. Rubber plug accommodating recess sections
19
are formed at the positions on the front side in the thick section of the bottom wall section
17
c
and opposed to the terminal accommodating chambers
13
. The diameters of the rubber plug accommodating recess sections
19
are large and the cross section of which are circular. The waterproof rubber plugs
18
are accommodated into the rubber plug accommodating recess section
19
by means of press-fitting. Electrical wire insertion holes
21
are formed on the rear side of the thick section, the diameters of which are small and the cross-sections of which are circular. The electrical wires are inserted into the electrical wire insertion holes
21
. The electrical wire insertion holes
21
are adapted to be communicated with corresponding rubber plug accommodating recess section
19
. Each waterproof rubber plug
18
is formed into a substantially cylindrical shape, the inner and the outer circumferential face of which are respectively protruded and recessed, so that the electrical wire
20
can penetrate the waterproof rubber plug
18
without leaving any gaps.
Engaging holes
22
are provided respectively on both sides of the front portions of the upper and the lower wall of the inner wall section
17
a
of the outer housing
17
. The engaging claws
15
on both sides of the upper and the lower face of the box section
12
a
of the inner housing
12
are engaged with the engaging hole
22
, respectively.
Rectangular long engaging holes
23
are provided respectively at the centers on the front side of the upper and the lower wall of the inner wall section
17
a
. The engaging claws
15
at the centers of the upper and the lower face of the box section
12
a
of the inner housing
12
are engaged with the rectangular long engaging holes
23
, respectively. A V-shaped packing receiving section
25
for receiving the annular waterproof packing
24
made of rubber is provided at the inner portion on the outer face side of the inner wall section
17
a
of the outer housing
17
. There is respectively formed a tapered-face
26
at a position opposing to each engaging hole
22
,
23
at the front-edge on the inner face side of the inner wall section
17
a
of the outer housing
17
. An engaging hole
27
is formed respectively on the front side of the upper and the lower wall of the outer wall section
17
b
of the outer housing
17
. A flexible engaging arm of the connector on the opponent side not shown is engaged with the engaging hole
27
.
As shown in
FIGS. 6 and 7
, the spacer
28
includes: a body section
28
a
engaged with the inner face side of the inner wall section
17
a
of the outer housing
17
, the shape of which is substantially cylindrical; a flange section
28
b
engaged with the outer face side of the inner wall section
17
a
of the outer housing
17
, the shape of which is substantially cylindrical, which is integrally formed so that it is bent backward from the front end portion of the body section
28
a
; and a bottom wall section
28
c
of the body section,
28
a
, wherein the spacer
28
is formed into a box-shape, the front side of which is open.
The box section
12
a
of the inner housing
12
is engaged inside the body section
28
a
of the spacer
28
. On the inner faces of the upper and the lower wall of the body section
28
a
of the spacer
28
, there are respectively provided rib-shaped protrusions
29
for preventing the terminal from coming off by engaging with the rear end edge of the box section
12
a
of the housing
12
and also by engaging with the rear end edge of the box section
14
a
of the female terminal
14
accommodated in each terminal accommodating chamber
13
.
Cutout sections
30
,
31
are formed respectively at the positions on the front side of the connecting section of the body section
28
a
and the flange section
28
b
of the spacer
28
to where the engaging claws
15
and the flange section of the inner housing
12
are opposed. Engaging claws
32
, which are integrally protruded, engaged with the engaging holes
23
of the outer housing
17
are provided on the outer face side of the upper and the lower wall of the body section
28
a
of the spacer
28
between the cutout sections
30
,
30
on the upper and the lower side. Further, the forward end section of the flange section
28
b
of the spacer
28
holds the packing
24
engaged with the packing receiving section
25
of the inner wall section
17
a
of the outer housing
17
.
Electrical wire insertion holes
33
are respectively formed at the positions in the bottom wall section
28
c
of the spacer
28
which are opposed to the electrical wire insertion holes
21
of the outer housing
17
. The bottom wall section
28
c
of the spacer
28
holds the rubber plugs
18
inserted into the rubber plug accommodating recesses
19
of the bottom wall section
17
c
of the outer housing
17
when the engagement with the outer housing
17
has been completed. As shown in
FIG. 6
, each electrical wire
20
penetrating each electrical wire insertion hole
21
of the outer housing
17
, each rubber plug
18
and each electrical wire insertion hole
33
of the spacer
28
is connected with pressure between a pair of pressure-contact blades
14
b
,
14
b
of each male terminal
14
accommodated in each terminal accommodating chamber
13
of the inner housing
12
. Therefore, each terminal accommodating chamber
13
and each electrical wire
20
are sealed by each rubber plug
18
and packing
24
.
In the case of assembling the above waterproof connector
10
, as shown in FIG.
8
(
a
), first, the rubber plug
18
is inserted in the connector housing engaging direction into each rubber plug accommodating recess section
19
inside the bottom wall section
17
c
of the outer housing
17
. At the same time, the packing
24
is inserted into the packing receiving section
25
of the inner wall section
17
a
of the outer housing
17
.
After that, as shown in FIG.
8
(
b
), the body section
28
a
of the spacer
28
is inserted into the inner wall section
17
a
of the outer housing
17
, and each engaging claw
32
of the body section
28
a
of the spacer
28
is engaged with each engaging hole
23
of the inner wall section
17
a
of the outer housing
17
. When each engaging hole
23
of the inner wall section
17
a
of the outer housing
17
is engaged with each engaging claw
32
of the body section
28
a
of the spacer
28
, each rubber plug
18
is prevented from coming off by the bottom wall section
17
c
of the outer housing
17
, and at the same time the packing
24
is prevented from coming off by an inclined end portion of the flange section
28
b
of the spacer
28
. Therefore, the waterproof property of the entire connector housing can be more enhanced.
Next, as shown in FIG.
8
(
c
), the electrical wire
20
is penetrated through each rubber plug
18
and each electrical wire insertion hole
33
of the bottom wall section
28
c
of the spacer
28
from each electrical wire insertion hole
21
of the bottom wall section
17
c
of the outer housing
17
. Next, as shown in FIG.
8
(
d
), each electrical wire
20
is connected with pressure to a pair of pressure-contact blades
14
b
,
14
b
of the female terminal
14
accommodated in each terminal accommodating chamber
13
of the inner housing
12
composing the inside of the connector housing
11
.
Next, as shown in FIG.
8
(
e
), the inner housing
12
is inserted into the body section
28
a
of the spacer
28
, and each engaging claw
15
of the box section
12
a
of the inner housing
12
is engaged with the each engaging hole
23
of the inside wall section
17
a
of the outer housing
17
. In this way, assembling of the waterproof connector
10
is completed. In this case, the rear edge end of the box section
12
a
of the inner housing
12
and the rear edge end of the box section
14
a
of the female terminal
14
accommodated in each terminal accommodating chamber
13
are respectively locked by the protrusions
29
protruding onto the inner faces of the upper and the lower wall of the body section
28
a
of the spacer
28
, and further the protrusions
29
are not deformed outside. Accordingly, the female terminal
14
can be positively prevented from coming off from each terminal accommodating chamber
13
. Further, both the female terminal
14
and the rubber plug
18
can be simultaneously held by the spacer
28
. Therefore, it is unnecessary to provide exclusive parts used for preventing the rubber plug from coming off. Accordingly, the number of parts can be reduced and the manufacturing cost can be decreased. Further, the spacer
28
is locked double by the engagement of each engaging claw
32
of the spacer
28
with engaging hole
23
of the outer housing
17
and also by the engagement of each engaging claw
15
of the inner housing
12
with each engaging hole
23
of the outer housing
17
. Therefore, each rubber plug
18
and packing
24
can be positively prevented from coming off. Accordingly, reliability of the waterproof connector can be more enhanced.
Second Embodiment
Second embodiment improves the efficiency of the waterproof connector
10
of the first embodiment.
FIG.
1
(
a
) is a cross-sectional view showing a state of a waterproof connector of an second embodiment of the present invention before it is assembled. FIG.
1
(
b
) is a cross-sectional view showing a state of the. waterproof connector after it has been assembled.
FIG. 2
is a cross-sectional view of an outer housing used for the waterproof connector.
FIG. 3
is a cross-sectional view showing a state in which a rubber plug is integrally formed in the outer housing.
FIG. 4
is a rear view of the outer housing in which the rubber plug is integrally formed. FIG.
5
(
a
) is a partially cross-sectional view of a primary portion of an outer housing with which the rubber plug is integrally formed. FIG.
5
(
b
) is a partially cross-sectional view of a comparative example of the primary portion.
As shown in FIGS.
1
(
a
),
1
(
b
) and
4
, the connector housing
2
of the waterproof connector
1
includes: an inner housing
3
made of synthetic resin in which a plurality of terminal accommodating chambers
4
are integrally formed in the vertical and the horizontal direction (two stages of the terminal accommodating chambers
4
are formed in the vertical direction and three stages of the terminal accommodating chambers
4
are formed in the horizontal direction); and an outer housing
5
made of synthetic resin into which the inner housing
3
is inserted.
This inner housing
3
includes: a box section
3
a
, the upper and the lower face on the rear side of which are open, which is engaged with the inner face of the inner wall of the outer housing
5
; and a flange section
3
b
, the shape of which is substantially cylindrical, which is integrally formed in such a manner that it is bent backward from the front end of the box section
3
a
and which-is engaged with the outer face of the inner wall section
5
a
of the outer housing
5
. Each terminal accommodating chamber
4
is formed in a space formed by the central horizontal wall
3
c
of the box section
3
a
and each vertical side wall
3
d
also used as a partition wall. Each terminal accommodating chamber
4
accommodates the female terminal (terminal)
9
with which electrical wire W is connected.
Engaging claws (engaging section)
3
e
to be engaged with the engaging holes
5
f
of the outer housing
5
are provided at the centers on both sides of the box section
3
a
of the inner housing
3
. These engaging claws
3
e
are integrally protruded from both sides of the box section
3
a
. The front end portion of the flange section
3
b
of the inner housing
3
holds packing P which is inserted onto the outer face side of the inner wall section
5
a
of the outer housing
5
when engagement of the inner housing
3
with the outer housing
5
is completed. In this connection, a rectangular insertion hole
3
f
, into which the male terminal of the opponent connector not shown, is inserted is formed at a position opposed to each terminal accommodating chamber
4
on the front wall of the box section
3
a
. A pair of pressure-contact blades
9
b
,
9
b
with which electrical wire W is connected with pressure are provided in both side plate sections at the rear of the box section
9
a
of the female terminal
9
. These pair of pressure-contact blades
9
b
,
9
b
are formed by bending.
The outer housing
5
includes: an inner wall section
5
a
, the shape of which is substantially square cylindrical; an external wall section
5
b
, the shape of which is substantially square cylindrical, which encloses this inner wall section
5
a
; and a bottom wall section (one wall section)
5
c
which connects the inner wall section
5
a
with the outer wall section
5
b
. Therefore the outer housing
5
is formed into a double box, the front side of which is open. A peripheral wall
5
d
which protrudes outside in such a manner that the peripheral wall
5
d
continues to the inner wall section
5
a
is provided at the center of this bottom wall section
5
c
. A terminal accommodating chamber
6
A, the cross-section of which is circular via the partition wall
5
e
, is provided at a position corresponding to each terminal accommodating chamber
4
on the front side of this peripheral wall
5
d
. On the rear side of the peripheral wall
5
d
, there is provided a rubber plug accommodating chamber
6
B, the cross-section of which is circular, communicating with each terminal accommodating chamber
6
A via the partition wall
5
e.
As shown in
FIGS. 2
to
4
, in the rows in the vertical direction of the peripheral wall
5
d
and the partition wall
5
e
forming the rubber plug accommodating chamber
6
B of the outer housing
5
, there are provided a plug material injection port
7
A, plug material path
7
B and vent hole
7
C which are serially arranged in this order from the upper to the lower portion. In this case, the rows in the vertical direction of the peripheral wall
5
d
and the partition wall
5
e
are three vertical rows including the left, central and right rows. Molten rubber material (plug material) not shown is injected into each rubber plug accommodating chamber
6
B in each row from the plug material injection port
7
A of each row. In this way, the rubber plug
8
is integrally formed on the outer circumference of electrical wire W being closely contacted with electrical wire W. The sealing portion
8
b
, which is protruded, the cross-section of which is formed into a reverse U-shape, is integrally formed into an annular shape in the electrical wire insertion hole
8
a
of each rubber plug
8
. That is, in the case where the rubber plug
8
is integrally formed in each rubber plug accommodating chamber
6
in each row of the outer housing
5
, first, the outer housing
5
is formed into the shape shown in
FIG. 2
by means of molding. After that, a rubber forming mold not shown is arranged in the inner-wall section
5
a
, outer wall section
5
b
, peripheral wall
5
d
and partition wall
5
e
of the outer housing
5
, and molten rubber material is made to flow into the cavity of the rubber forming mold from the plug material injection port of each row. In this way, the rubber plug
8
is integrally formed in each rubber plug accommodating chamber
6
B of each row of the outer housing
5
.
As shown in FIG.
5
(
a
), the following inequality is satisfied,
A−B>C,
where A is an inner diameter of each rubber plug accommodating chamber
6
B of the outer housing, B is an inner diameter of each sealing portion
8
b
in the electrical wire insertion hole
8
a
of each rubber plug
8
, and C is an outer diameter of electrical wire W. Further, the positions of a pair of sealing portions
8
b
,
8
b
in the electrical wire insertion hole
8
a
of the rubber plug
8
integrally formed in each rubber plug accommodating chamber
6
B in each row are arranged so that they can not be the same as the positions of the plug material injection port
7
A, plug material path
7
B and vent hole
7
C of each row. That is, the pair of sealing portions
8
b
,
8
b
of the rubber plug
8
are located at positions distant from the plug material injection hole
7
A and others by the substantially same distance.
Rectangular engaging holes (engaging sections)
5
f
which are attached to and detached from the engaging claws
3
e
arranged on both sides of the box section
3
a
of the inner housing
3
are provided on both sides of the front of the inner wall section
5
a
of the outer housing
5
. Further, an annular waterproof packing P made of rubber is inserted into the inner portion on the outer face side of the inner wall section
5
a
of the outer housing
5
.
The waterproof connector
1
of the above embodiment is assembled as follows. Packing P is previously inserted into the inner part on the outer face side of the inner wall section
5
a
of the outer housing
5
which forms the outside of the connector housing
2
. Next, as shown in FIG.
1
(
a
), electrical wire W is penetrated from the outside into the electrical wire insertion hole
8
a
of the rubber plug
8
integrally formed in each rubber plug accommodating chamber
6
B of the outer housing
5
. Next, electrical wires W are connected with pressure with a pair of pressure-contact blades
9
b
,
9
b
of each female terminal
9
accommodated in the plurality of terminal accommodating chambers
4
of the inner housing
3
composing the. inside of the connector housing
2
.
Next, electrical wire W is drawn in the direction of the outside of the outer housing
5
. While electrical wire W is being slid with respect to the electrical. wire insertion hole
8
a
of the rubber plug
8
integrally formed in each rubber plug accommodating chamber
6
B of the outer housing
5
, the inner housing
3
is engaged with the inner wall section
5
a
of the outer housing
5
as shown in FIG.
1
(
b
). Due to the above engagement, each engaging claw
3
e
of the box section
3
a
of the inner housing is engaged with each engaging hole
5
f
of the inner wall section
5
a
of outer housing
5
. In this way, assembling the waterproof connector
1
is completed. When this assembling work is completed, the pressure-contact blade
9
b
of each female terminal
9
is accommodated in each terminal accommodating chamber
6
A of the outer housing
5
.
As described above, the rubber plug
8
tightly coming into contact with the outer circumference of electrical wire W is formed in each rubber plug accommodating chamber
6
B when plug material is injected from each plug material injection port
7
A of each row in the vertical direction of the outer housing
5
. Therefore, the cycle time of integrally forming rubber material is shortened, that is, the molding time can be reduced. Each rubber plug accommodating chamber
6
B is made to adhere to each rubber plug
8
by primer. Therefore, it is possible to provide a perfect waterproof performance. Further, the rubber plug
8
having a pair of sealing portions
8
b
,
8
b
tightly coming into contact with the outer circumference of electrical wire W is integrally formed in each rubber plug accommodating chamber
6
B of the outer housing
5
. Therefore, there is no possibility that a worker forgets to attach the rubber plug
8
, and sealing can be easily and positively made between the rubber plug
8
and electrical wire W. Therefore, the waterproof performance and the waterproof reliability can be more enhanced. Due to the foregoing, it becomes unnecessary to provide a process in which the rubber plug
8
is attached to each rubber plug accommodating chamber
6
B of the outer housing
5
when the waterproof connector
1
is assembled. Therefore, the multipolar waterproof connector
1
, the sealing property of which is high, can be simply assembled in a short period of time. Accordingly, the entire assembling property can be more enhanced.
As shown in FIG.
5
(
a
), the positions of a pair of sealing portions
8
b
,
8
b
in the electrical wire insertion hole
8
a
of the rubber plug
8
integrally formed in each rubber plug accommodating chamber
6
B in each row of the outer housing
5
are made to be different from the positions of the plug material injection port
7
A and others in each row. Therefore, it is possible to positively prevent the deterioration of the waterproof performance of electrical wire W with respect to the pair of sealing portions
8
b
,
8
b
in the electrical wire insertion hole
8
a
of each rubber plug
8
. That is, as shown in FIG.
5
(
b
), in the case where the position of the sealing portion
8
b
in the electrical wire insertion hole
8
a
of the rubber plug
8
′ integrally formed in each rubber plug accommodating chamber
6
B in each row is made to coincide with the position of the plug material injection port
7
A in each row, when electrical wire W is inserted into the electrical wire insertion hole
8
a
of the rubber plug
8
′, the rubber plug
8
′ is elastically deformed via the sealing portion
8
b
from the plug material injection port
7
A in the direction of an arrow shown in FIG.
5
(
b
). Therefore, resiliency of the sealing portion
8
b
is lowered, and the sealing property is deteriorated. However, in this embodiment, there is no possibility that the above phenomenon occurs. Accordingly, the waterproof performance and the waterproof reliability of the waterproof connector
1
can be more enhanced.
In the above embodiment, the electrical wire is connected to the crimp-style terminal by crimping. However, it should be noted that the present embodiment is not limited to the crimp-style terminal of course, the present embodiment can be applied to a case in which the electrical wire is connected to the pressure-connected terminal by pressure. Further, the rubber plug is not necessarily made of pure rubber. As long as it is an elastic material such as soft resin, it is possible to use the material for the rubber plug.
As explained above, according to the invention, plug material is injected from the plug material injection port in each row of the connector housing into each rubber plug accommodating chamber in each row, so that the rubber plug can be integrally formed in which the electrical wire insertion hole having a plurality of sealing portions tightly coming into contact with the outer circumference of the electrical wire is formed. Therefore, no workers forget to attach the rubber plugs, and sealing can be positively made between each rubber plug accommodating chamber of the connector housing and the rubber plug and also between the rubber plug and the electrical wire. Therefore, the waterproof performance and the waterproof reliability can be enhanced. Due to the foregoing, It becomes unnecessary to provide a process in which the rubber plug is attached to the connector housing when the waterproof connector is assembled. Therefore, the multipolar waterproof connector, the sealing property of which is high, can be assembled in a short period of time, and the entire assembling property can be more enhanced.
The present invention provides a waterproof connector, in which the positions of the plurality of sealing portions arranged in the electrical wire insertion holes of the rubber plugs integrally formed in the rubber plug accommodating chambers in each row are arranged so that they can not be the same as the positions of the plug material injection ports, plug material paths and vent holes in each row. Therefore, it is possible to prevent the deterioration of the waterproof performance with respect to a plurality of sealing portions in the electrical wire insertion holes of the rubber plug. Accordingly, the waterproof performance and the waterproof reliability of the waterproof connector can be more enhanced.
Claims
- 1. A waterproof connector comprising:a connector housing including a peripheral wall and at least one partition wall; a plurality of terminal accommodating chambers provided in said connector housing and arranged in vertical and horizontal direction of said connector housing, each of said terminal accommodating chambers adapted to accommodate an associated terminal connected to a wire; a plurality of rubber plug accommodating chambers provided in said connector housing and defined by said peripheral wall and said at least one partition wall, each of said rubber plug accommodating chambers communicated with a corresponding one of said terminal accommodating chamber; and a plurality of rubber plugs, for sealing said terminal accommodating chambers and said wire, respectively arranged at said rubber plug accommodating chambers, each of said rubber plugs forming a wire insertion hole; wherein said peripheral wall and said at least one partition wall form a plug material injection port, at least one plug material path and a vent hole such that said plug material injection port, said at least one plug material path and said vent hole are serially arranged in each row in one of said vertical direction and said horizontal direction; wherein said rubber plugs are integrally formed by injecting plug material into said rubber plug accommodating chambers from said plug material injecting port.
- 2. A waterproof connector according to claim 1, wherein each of said rubber plugs form a sealing portion close contacted with an outer circumference of said wire.
- 3. A waterproof connector according to claim 2, wherein a position of said sealing portion is offset from a position of said plug material injection port, said at least one plug material path and vent holes in a direction in which said wire is insertable into said rubber plug.
- 4. A waterproof connector:a connector housing; a terminal accommodating chamber provided in said connector housing; and a rubber plug accommodating chamber provided in said connector housing and adapted to pass a wire therethrough, one open end of said rubber plug accommodating chamber being connected to said terminal accommodating chamber, the other open end of said rubber plug accommodating chamber being communicated with an exterior of said connector housing so that said rubber plug accommodating chamber communicates an interior of said connector housing with said exterior via said terminal accommodating chamber, said rubber plug accommodating chamber including, two ports provided at a portion between said one open end and the other open end to communicate an interior of said rubberplug accommodating chamber with an exterior of said rubber plug accommodating chamber and located opposite from each other with respect to said rubber plug accommodating chamber, and a rubber plug accommodated in said rubber plug accommodating chamber and said ports, and adapted to seal said terminal accommodating chamber and said wire passed through said rubber plug accommodating chamber.
- 5. A waterproof connector according to claim 4, wherein a plurality of said rubber plug accommodating chambers are lineally arranged in a row in such a manner that rubber plugs in said adjacent rubber plug accommodating chambers are communicated together through said ports positioned between said adjacent rubber plug accommodating chambers.
- 6. A waterproof connector according to claim 4, wherein a plurality of said rubber plug accommodating chambers are arranged in vertical and horizontal direction to form a plurality of rows thereof.
- 7. A waterproof connector according to claim 6, wherein rubber plugs in said adjacent rubber plug accommodating chambers are communicated together through said ports positioned between said adjacent rubber plug accommodating chambers in each said row.
- 8. A waterproof connector according to claim 4, wherein a sealing portion is projected from an inside surface of said rubber plug for closely contact with, an outer circumference of said wire.
- 9. A waterproof connector according to claim 8, wherein a position of said sealing portion is offset from a position of said port in a direction in which said wire is insertable into said rubber plug.
Priority Claims (1)
Number |
Date |
Country |
Kind |
11-240187 |
Aug 1999 |
JP |
|
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
4961713 |
McCracken et al. |
Oct 1990 |
|
5485673 |
Lau |
Jan 1996 |
|
5823811 |
Blanchfield et al. |
Oct 1998 |
|
6102740 |
Murakami et al. |
Aug 2000 |
|
6174201 |
Murakami et al. |
Jan 2001 |
|
Foreign Referenced Citations (2)
Number |
Date |
Country |
2803849 |
Jul 1998 |
JP |
WO 8904072 |
May 1989 |
WO |