JPH09147967A - Waterproof structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the waterproof performance by preventing the uneven distortion of a rubber plug. SOLUTION: A tubular rubber tube 50 penetrable by a wire 20 forms a waterproof part 51 which can be contacted closely on the inner peripheral surface of a terminal metal fitting housing 11 to be a wire leading-in hole, at one end side divided in the axial direction, and an engaging part 52 forming a first flange 52a and a second flange 52b is provided at the other end side. By pinching with clamping pieces 61 and 61 forming semicircular holding grooves 62 and 62 corresponding to the engaging part 52, the first flange 52a is entered into the engaging grooves 62a in the holding grooves 62 and pinchedly held by covering the whole periphery by engaging the projections and the recesses impossible to displace in the axial direction. As a result, the rubber tube 50 can be held solidly without generating an uneven distortion to the engaging part 52 itself, so as to generate no uneven distortion as in case of pressure contacting by the barrel of a terminal metal fitting. Consequently, it is unnecessary to exercise the waterproof property more than necessary by assuming such a distortion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure mounted on an electric wire for use, and more particularly to a waterproof structure suitable for use in waterproofing a lead-out portion of an electric wire of a connector or the like having a terminal fitting crimped thereto.

[0002]

2. Description of the Related Art A conventional waterproof structure is shown in FIGS. In the figure, the rubber plug 1 is formed in a tubular shape and has lips formed on the inner peripheral surface and the outer peripheral surface. Further, one end in the axial direction is formed as a small diameter without forming the lip. .

The electric wire 2 is inserted through the rubber plug 1, the tip of the electric wire 2 is peeled off, and the wire barrel 4 of the terminal fitting 3 is crimped and fixed. The small-diameter portion of the rubber plug 1 is the same. It is fixed by crimping with the insulation barrel 5 of 3.

[0004]

In the above-mentioned conventional waterproof structure, since the barrel of the terminal fitting is caulked and fixed, it may be distorted depending on how the barrel is bent. Therefore, there is a problem in that the waterproof performance is dealt with with a margin, and the waterproof performance more than necessary is inevitably provided.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a waterproof structure capable of dealing with necessary and sufficient waterproof performance.

[0006]

In order to achieve the above object, the invention according to claim 1 is formed in a cylindrical shape that can be penetrated by an electric wire, and a part of the area divided in the axial direction is an outer peripheral surface. A rubber plug having a seal lip that can be in close contact with the inner peripheral surface of the cylindrical electric wire outlet for drawing out the electric wire, and a cover that sandwiches and presses the outer peripheral surface from the entire circumference at a portion other than the seal lip of the rubber plug. And is configured to include.

[0007] The invention according to claim 2 is based on claim 1.
In the waterproof structure described in (1), the cover can be engaged and fixed to a housing having the electric wire outlet. Further, the invention according to claim 3 is the waterproof structure according to claim 1 or claim 2, wherein the cover is configured to be able to hold a plurality of the rubber plugs by sandwiching them. Furthermore, the invention according to claim 4 is the waterproof structure according to any one of claims 1 to 3, wherein the cover is separable and united so that the rubber plug can be held.

Further, the invention according to claim 5 is the waterproof structure according to any one of claims 1 to 4, wherein a concavo-convex engagement structure is formed at a facing portion between the rubber plug and the cover.

[0009]

In the invention according to claim 1 configured as described above, an electric wire is passed through a rubber stopper formed in a tubular shape, and the cover covers the outer peripheral surface from the entire circumference except the seal lip of the rubber stopper. Insert and press. Since it is sandwiched and pressed from the entire circumference, the distortion is uniform, and the seal lip formed outside the sandwiching range is not unevenly distorted. In this way, when the electric wire is inserted into the cylindrical electric wire outlet, the seal lip comes into close contact with the inner peripheral surface of the electric wire outlet to form a watertight surface.

Further, in the invention according to claim 2 configured as described above, the cover is engaged and fixed to the housing in which the wire lead-out port is formed, so that when the lead-out wire is pulled, stress is exerted. Will be hung on the cover, and the housing can bear the load without hitting the rubber stopper. Further, in the invention according to claim 3 configured as described above,
By holding a plurality of rubber stoppers by sandwiching them with one cover, the respective electric wires can be grouped together.

Further, in the invention according to claim 4 configured as described above, since the cover is divided,
The rubber plugs are sandwiched from multiple directions in a divided state, and they are united and sandwiched. Further, in the invention according to claim 5 configured as described above, the rubber plug and the cover are engaged in a concavo-convex manner at the confronting portion, and cannot move in the axial direction.

[0012]

As described above, according to the present invention, in order to prevent uneven distortion of the rubber stopper, it is sufficient to have a design sufficient to exhibit the original waterproof performance, and it is necessary to have more than necessary waterproof performance. A waterproof structure that can be eliminated can be provided.

Further, according to the invention of claim 2, since the cover is fixed to the housing, the rubber plug is prevented from coming off from the wire lead-out port, and the pulling of the wire is not transmitted to the rubber plug. It is possible to prevent the deterioration of the waterproof performance at the time of deformation. further,
According to the third aspect of the invention, since the plurality of rubber stoppers are held by one cover, the electric wires do not become disjointed, and workability can be improved at the time of cabling work.

Further, according to the invention of claim 4,
Since the cover is divided, the mounting workability is good. Further, according to the invention of claim 5, since the rubber plug and the cover are engaged with each other in a concavo-convex manner, it becomes difficult for the rubber plug to come off from the cover, and the rubber plug cannot move in the axial direction.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a state where a waterproof structure according to an embodiment of the present invention is applied to a connector housing, FIG. 2 is a virtual perspective view showing an assembled state, and FIG. The attached state is shown by a perspective view. In the figure, a connector housing 10 is formed in a rectangular box shape in which two terminal fitting housing chambers 11 and 11 are arranged side by side. In each terminal fitting housing chamber 11, a terminal fitting 30 to which a wire 20 is crimped and connected, A waterproof structure 40 penetrated at 20 can be inserted. In the present embodiment, the member to which the waterproof structure 40 is attached is a connector, but the member is not necessarily a connector and can be widely applied to a portion where an electric wire is generally led out. Also,
The terminal fitting 30 can also be changed to a male side or a female side as appropriate.

The waterproof structure 40 is composed of a rubber plug 50 and a cover 60 for sandwiching and holding the two rubber plugs 50, 50. The rubber plug 50 is formed in a tubular shape through which the electric wire 20 can be inserted. The rubber plug 50 is axially sectioned and has a seal lip 51 in one range and an engaging portion 52 in the other range. The seal lip 51 has a triple lip 51a formed on the outer peripheral surface thereof, and when the lip 51a is inserted into the terminal fitting housing chamber 11, the lip 51a comes into close contact with the inner peripheral surface thereof to form a watertight surface. There is. In the present embodiment, the triple lip 51a is formed, but the lip 51a is not necessarily formed as long as it can be adhered to the inner peripheral surface of the cylinder such as the terminal fitting housing chamber 11. Further, although the rubber plug 50 and the terminal fitting accommodating chamber 11 have a substantially cylindrical shape, they do not necessarily have to have a cylindrical shape, and may be formed in a rectangular shape depending on an application target.

The engaging portion 52 has a first flange 52a formed at the end, and the first flange 52a and the seal lip 51.
And a second flange 52b formed between the two.
On the other hand, the cover 60 is divided into upper and lower parts, which form sandwiching pieces 61, 61, respectively. Semi-circular holding grooves 62, 62 are formed on the divided surfaces of each holding piece 61, and a cylindrical hole is formed when the upper and lower holding pieces 61, 61 face each other. The cylindrical hole covers the engagement portion 52 of the rubber plug 50 so as to cover the entire peripheral surface thereof.
An annular engagement groove 62a is formed so as to correspond to the first flange 52a formed at the second end portion. The second flange 52b is in contact with the side surface of the sandwiching piece 61 outside the holding groove 62. Since the second flange 52b comes into contact with the side surface of the sandwiching piece 61 from the seal lip 51 side, it is possible to generate a large drag force against the pulling of the electric wire 20.

In the present embodiment, the cover 60 is composed of the two holding pieces 61, 61, but it may be any type as long as it holds the engagement portion 52 of the rubber plug 50 so as to cover the entire circumference. , It is not always necessary to form a separate holding piece 61 by connecting with a hinge. Further, although one cover 60 holds the two rubber plugs 50, a larger number of rubber plugs 50 may be arranged and held. In this case, one cover 60 is divided into two holding pieces 61, 61.
Instead of sandwiching it, as shown in FIG. 4, when the terminal fitting accommodating chamber 11 is three-dimensionally arranged as 2 × 2, another sandwiching piece 63 should be interposed therebetween. You can The holding pieces 63 have two holding grooves 62 formed on each of the upper surface and the lower surface, and one holding piece 61 can be mounted on each of the upper surface and the lower surface. In this way, one cover 60 can hold the four rubber plugs 50.

By the way, the sandwiching pieces 61, and the sandwiching piece 6
1 and a sandwiching piece 63, one side wall surface adjacent to each other is formed with a loop-shaped lock piece 64 extending toward the other side wall surface side, and the other side wall surface is provided with a locking projection at a position covered by the lock piece 64. 65 is formed. Here, since the lock pieces 64 and the locking projections 65 are alternately formed on both side wall surfaces, there is no directivity in the vertical direction, and the number of types of parts is reduced. When the sandwiching pieces 61, 61 are combined to sandwich the engaging portion 52 of the rubber plug 50, the first flange 52a enters the engaging groove 62a in the holding groove 62 and cannot be displaced in the axial direction. In this embodiment,
Although the rubber plug 50 and the cover 60 are engaged with each other by such a concavo-convex engagement structure, the concavo-convex can be reversed, or another concavo-convex shape that is at least immovable in the axial direction can be used. Also, when sandwiching between the sandwiching pieces 61, 61, pressure may be applied to press them so that they cannot be displaced in the axial direction. At this time, if an annular rib is formed inside the holding groove 62 so as to press the electric wire 20 as well, the electric wire 2
0 becomes difficult to slip through.

On the cover 60, lock pieces 66, 66 similar to the lock piece 64 united by the holding pieces 61 are also extended toward the connector housing 10 side, similarly to the locking projection 65. Locking projections 12, 12 are also formed on both side wall surfaces of the connector housing 10. Therefore, when the cover 60 is assembled and is pressed against the opening surface of the terminal fitting housing chamber 11 of the connector housing 10, the lock pieces 66, 66 are locked.
While being pressed so as to sandwich both side surfaces of the above, they come into contact with the locking projections 12, 12 and get over and lock.

Since the cover 60 is fixed to the connector housing 10, the rubber plug 50 is also fixed to the connector housing 10. For example, even if the electric wire 20 is pulled, the cover 60 is held by the connector housing 10. So you won't get out. Of course, the cover 60 can be fixed to the connector housing 10 not only by the combination of the lock piece 66 and the locking projection 12 but also by another locking structure or the like as appropriate.

Next, the operation of this embodiment having the above configuration will be described. The electric wire 20 is passed through the rubber plug 50, and a terminal fitting is crimp-connected to the tip of the electric wire 20, and the engaging portion 52 of the rubber plug 50 is mounted in the holding groove 62 of the sandwiching piece 61. Next, the other sandwiching piece 61 is covered from above, and the locking piece 64 and the locking projection 65 are engaged on both side surfaces. When the cover 60 is united in this way, the cover 60 is inserted into the terminal fitting housing chamber 11 of the connector housing 10 from the terminal fitting 30 side. When the seal lip 51 of the rubber stopper 50 is inserted into the terminal fitting housing chamber 11, the connector housing 1
Lock pieces 66, 66 for 0 sandwich both side wall surfaces,
The locking projections 12, 12 are passed over and engaged. in this case,
The terminal fitting may be inserted into a predetermined position in the terminal fitting housing chamber 11 first, and the rubber plug 50 may be displaced with respect to the electric wire 20 to engage the cover 60 with the connector housing 10. The rubber plug 50 may also be slid into the terminal fitting housing chamber 11 while inserting the plug.

As described above, the cylindrical rubber plug 50 which can be penetrated by the electric wire 20 has a seal lip which can be adhered to the inner peripheral surface of the terminal fitting accommodating chamber 11 which serves as an electric wire outlet on one end side divided in the axial direction. 51 is provided and the first flange 5 is provided on the other end side.
2a and a second flange 52b are formed in the engaging portion 52, and the semicircular holding groove 6 corresponding to the engaging portion 52.
The first flange 52a is engaged with the engaging groove 6 in the holding groove 62 by being sandwiched by the sandwiching pieces 61, 61 having the grooves 2, 62 formed therein.
The rubber stopper 50 is firmly held without causing uneven distortion in the engaging portion 52 itself, because the engaging portion 52 itself is clamped so as to wrap around the entire circumference while entering into 2a and engaging in a concave and convex shape so as not to be displaced in the axial direction. This makes it possible to prevent uneven distortion such as when crimping with the barrel of the terminal fitting. Therefore, it is not necessary to form such a distortion so as to exert more waterproof performance than necessary.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a waterproof structure according to an embodiment of the present invention.

FIG. 2 is a virtual perspective view of a waterproof structure assembled.

FIG. 3 is a perspective view of an assembled state of the waterproof structure.

FIG. 4 is an exploded perspective view of a waterproof structure according to a modification.

FIG. 5 is a perspective view of a conventional rubber stopper.

FIG. 6 is a side view showing a state where a conventional rubber plug is fixed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Connector housing 11 ... Terminal metal housing chamber 20 ... Electric wire 30 ... Terminal metal 40 ... Waterproof structure 50 ... Rubber stopper 51 ... Seal lip 52 ... Engagement portion 60 ... Cover 61 ... Clamping piece 63 ... Clamping piece

Claims (5)

[Claims] 1. A cylindrical shape that can be penetrated by an electric wire, and a part of the area divided in the axial direction can be in close contact with the inner peripheral surface of the cylindrical electric wire outlet from which the electric wire is drawn out on the outer peripheral surface. A waterproof structure comprising: a rubber stopper having a different seal lip; and a cover that presses the outer peripheral surface of the rubber stopper by sandwiching the outer peripheral surface from the entire circumference with a portion other than the seal lip. 2. The waterproof structure according to claim 1, wherein the cover can be engaged and fixed to a housing having the wire outlet. 3. The waterproof structure according to claim 1 or 2, wherein the cover can hold a plurality of the rubber stoppers by sandwiching the rubber stoppers. 4. The waterproof structure according to any one of claims 1 to 3, wherein the cover is separable and united to hold the rubber plug. 5. The waterproof structure according to any one of claims 1 to 4, wherein a concavo-convex engagement structure is formed at an opposing portion of the rubber plug and the cover so as not to move in the axial direction. Construction.