JPH0982401A - Waterproof connector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect electric wirings arranged respectively inside and outside a casing without leaking the liquid stored in the casing to outside. SOLUTION: A waterproof connector 100 has a housing 20 set in a hole 11 for leading out a cable, an O ring 30 for sealing liquidtightly the space between the periphery of the barrel and the hole 11 for leading a cable, being attached on the periphery of the body barrel 21 of that O ring 20, and a tubular elastic cover 40 capable of expansion and contraction in the axial direction, being set freely around the said body barrel 21 so as to cover that O ring 30. In condition before the housing 20 being set in the hole 11 for leading out a cable, the O ring 30 is protected, being covered with the elastic cover 40. When the housing 20 is set in the hole 11 for leading out a cable, the said elastic cover 40 is caught in the axial direction between the flange 23 for regulation and the said casing 2 so as to seal the outside periphery of the hole 11 for leading out a cable.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for connecting electrical wiring, and more particularly to a waterproof connector for connecting electrical wiring provided inside and outside a casing containing a liquid therein.

[0002]

2. Description of the Related Art There are various types of connectors for connecting electrical wiring. Among them, there are various types of connectors, such as an automatic transmission of an automobile, inside and outside a casing containing a liquid (mission oil) therein. There is a waterproof connector that connects the electrical wiring provided. Since this type of waterproof connector is fitted in a mounting hole penetrating the casing, it is possible to connect electrical wiring while preventing the liquid contained inside the casing from leaking to the outside. It has a structure.

As an example of such a connector, there is a waterproof connector disclosed in Japanese Utility Model Laid-Open No. 4-76086. As shown in FIG. 4, this waterproof connector 1 is fitted in a hole 2a penetrating a casing 2 of an automobile transmission, and has wiring 3 of an electric device arranged inside the casing 2, The wiring 4 of the control device arranged outside the casing 2 is connected to each other. Then, in the tubular housing 5 of the waterproof connector 1, the gap between the housing 5 and the inner peripheral surface of the hole 2a is liquid-tightly sealed so that the oil in the casing does not leak outside. An O-ring 6 which is a sealing member is attached. On the other hand, an elastic member 7 is fitted inside the housing 5 to close the space inside the housing 5. A liquid-tight resin 8 is filled around the connection between the wiring 3 and the wiring 4 penetrating the elastic member 7 so that the oil in the casing does not leak from the inside of the housing 5 to the outside. There is.

[0004]

By the way, since the O-ring 6 is exposed before the waterproof connector 1 is fitted into the hole 2a of the casing 2 as described above, dust is not formed on the surface of the O-ring 6. It may adhere or be scratched. When the waterproof connector 1 is fitted into the hole 2a with dust or scratches on the O-ring 6, the seal by the O-ring 6 becomes incomplete and the oil in the casing 2 leaks to the outside. there is a possibility.

Further, in the above-mentioned waterproof connector 1, a stopper portion 5a is provided at the tip of the housing 5 in the insertion direction to prevent it from coming off, and a stopper provided at the rear end of the housing 5 to serve as a stopper in the insertion direction. The wall of the casing 2 is held by the portion 5b, and the housing 5 is locked in the hole 2a of the casing 2. However, these stopper portion 5a and stopper portion 5b
Since both are injection-molded integrally with the housing 5 from a synthetic resin material, they do not have sufficient elasticity.

In order to securely lock the waterproof connector 1 on the wall of the casing 2, the stopper portion 5a is provided.
The distance between the stopper and the stopper portion 5b must be set wider than the thickness of the wall body. Therefore, the waterproof connector 1
When vibration is applied to the waterproof connector 1, the waterproof connector 1 is displaced in the axial direction and the O-ring 6 and the inner wall surface of the hole 2a slide.
There is a problem that the O-ring 6 may wear gradually.

That is, the waterproof connector 1 as described above is
Although the gap between the housing 5 and the inner peripheral surface of the hole 2a is liquid-tightly sealed only by the O-ring 6 which is the outer seal, the O-ring 6 alone prevents oil from leaking out of the casing. There is a problem that the reliability of the function of preventing the intrusion of water or the like from the outside is low. Therefore,
It is an object of the present invention to solve the above-mentioned problems, and to prevent the liquid contained in the casing from leaking outside, it is possible to connect the electric wirings arranged inside and outside the casing, respectively, which is a good waterproof property. To provide a connector.

[0008]

The above object of the present invention is to electrically connect the electric wirings arranged inside and outside the casing and to seal the wire drawing hole provided in the casing. A waterproof connector, a housing fitted into the wire drawing hole, and a seal member mounted on an outer peripheral surface of the housing to seal a gap between the wire drawing hole in a liquid-tight manner, and the sealing member A cylindrical elastic cover which is arranged on the outer peripheral portion of the housing to extend and contract in the axial direction so as to cover the housing, and the housing is inserted into the wire drawing hole when the housing is inserted. The waterproof connector characterized in that the elastic cover mounted between the casing and the regulating flange portion provided at the rear end in the direction of insertion and the casing seals the outer periphery of the wire drawing hole. More is achieved. The elastic cover is preferably formed in a bellows shape.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a waterproof connector according to the present invention will be described below in detail with reference to the accompanying drawings. As shown in FIGS. 1 and 2, the waterproof connector 100 of the present embodiment has a housing 20 fitted in a wire drawing hole 11 penetrating a wall of a casing 10, and an outer peripheral surface of the housing 20. O as a seal member attached to
A ring 30 and a cylindrical elastic cover 40 arranged on the outer peripheral portion of the housing 20 to cover the O-ring 30 are provided.

The housing 20 is injection-molded from a synthetic resin material, and is provided at the tip of the cylindrical main body portion 21 fitted in the wire drawing hole 11. Connector fitting portion 22 for fitting with a mating connector (not shown), and an insertion direction regulating flange portion 23 provided at a rear end of the main body portion 21 in the insertion direction.
And

The outer peripheral surface 21a of the main body portion 21 is
At the tip of the collar, a brim-shaped engaging portion 2 is provided over the entire circumference.
8 are protruded. As a result, when the housing 20 is fitted into the wire drawing hole 11, the locking portion 28 engages with the inner wall surface 12 of the wall body of the casing 10, and the housing 2
0 is locked so as not to slip out from the wire drawing hole 11. The shape of the locking portion 28 is not limited to the shape of this embodiment, but may be, for example, a plurality of locking lance shapes appropriately arranged along the circumferential direction. Further, the O-ring 30 is mounted in a recessed groove 24 that is recessed in the outer peripheral surface 21a of the main body portion 21 and extends in the circumferential direction.

On the other hand, the inner space of each of the main body portion 21 and the connector fitting portion 22 is partitioned by a partition wall 25. Then, the male terminal 52 attached to the tip of the electric wiring 51 extending from the control device arranged outside the casing penetrates the partition wall 25, and the tip thereof is inside the inner space of the connector fitting portion 22. It is protruding. Further, the electric wiring 51 penetrates a disk-shaped closing member 26 formed of a rubber material that closes the inner space of the main body portion 21.

The partition wall 25 and the closing member 2
6 is filled with a liquid-tight resin 27 having excellent insulating properties, heat resistance, and oil resistance, such as epoxy resin or silicon resin, which fills and closes the periphery of the male terminal 52. The oil is prevented from leaking to the outside after passing between the core wire and the coating of the electric wiring 51 in the housing 20.

The elastic cover 40 is injection-molded from a rubber material in a bellows shape, and is inserted in a loosely fitted state between the locking portion 28 and the regulating flange portion 23.
The elastic cover 40 is configured to cover the O-ring 30 when the elastic cover 40 is fitted to the main body portion 21 of the housing 20. As a result, the O before the waterproof connector 100 is attached to the casing 10
The ring 30 is covered and protected by the elastic cover 40, and it is possible to prevent dust from adhering to or scratching the surface of the ring 30. Incidentally, the base end portion 41 of the elastic cover 40 is locked to the regulating flange portion 23, and the tip end portion 4
Only 2 may be the free end.

Next, a state in which the waterproof connector 100 of the present embodiment having the above-described structure is attached to the wire drawing hole 11 will be described with reference to FIG. When the main body portion 21 of the housing 20 is inserted into the wire drawing hole 11, the elastic cover 40 is pressed by the outer wall surface 13 of the casing 10 and gradually compressed in the axial direction, so that the O-ring 3
Expose 0. Then, the O-ring 30 comes into close contact with the inner peripheral surface of the wire drawing hole 11 and seals the gap between the inner peripheral surface of the wire drawing hole 11 and the housing outer peripheral surface 21a. This prevents the oil in the casing from leaking out.

The elastic cover 40 mounted axially between the regulating flange portion 23 and the outer wall surface of the casing 10 has its base end portion 41 and tip end portion 42 due to its own elastic force. 2 for regulating flange
3 and the outer wall surface 13 are closely attached. As a result, foreign matter such as rainwater and earth and sand scattered around the casing 10 is blocked by the elastic cover 40, and the outer periphery of the wire drawing hole 11 is sealed.

At the same time, the elastic cover 40, which is sandwiched between the regulating flange portion 23 and the casing 10 and compressed, causes the locking portion 28 of the housing 20 to always be kept inside the casing 10 by its own elastic force. Since the waterproof connector 100 is urged in a direction to be engaged with the wall surface 12 and has a damper function, the casing 10 and the housing 20 are unlikely to be displaced relative to each other even when vibration is applied to the waterproof connector 100, and the O-ring 30 and the electric wire. Since the inner peripheral surface of the pull-out hole 11 does not slide, the O-ring 30 is not worn and the sealing performance is not impaired.

That is, in a state before the waterproof connector 100 of this embodiment is fitted into the wire drawing hole 11, O
Since the ring 30 is covered and protected by the elastic cover 40, dust does not adhere to the surface of the O-ring 30. As a result, it is possible to prevent the oil in the casing from leaking to the outside by damaging the sealing by the O-ring 40 when the casing is mounted.

Further, since the elastic cover 40 of this embodiment is formed in a bellows shape from a rubber material, its rigidity in the radial direction is high. Accordingly, when the waterproof connector 100 is fitted into the wire drawing hole 11, even if an operator accidentally drops the waterproof connector 100 on the floor, the oil seal 30 is not directly hit. The surface of the O-ring 30 is not scratched and the sealing performance is not impaired.

Further, when the waterproof connector 100 is fitted in the wire drawing hole 11, the elastic cover 40 covers the outer periphery of the wire drawing hole 11 to block the foreign matter, so that the foreign matter is drawn into the wire drawing hole 11. The sealing performance of the O-ring 30 will not be deteriorated by entering the gap between the inner peripheral surface of the housing 11 and the outer peripheral surface 21a of the housing. Further, the waterproof connector 100 has a damper function due to the elastic force of the elastic cover 40, and even if vibration is applied to the waterproof connector 100, the casing 10 and the housing 20 are displaced relative to each other and the O-ring 30 and the electric wire are drawn out. Since the inner peripheral surface of the hole 11 does not slide, the O-ring 30 is not worn and the sealing performance is not impaired.

Although the waterproof connector according to one embodiment of the present invention has been described in detail above, it goes without saying that the present invention is not limited to the above-described embodiment and various modifications can be made. For example, in the above-described embodiment, the elastic cover is formed of a bellows-shaped rubber material, but it is not necessary to be caught by this, and the sealing member should be covered before the waterproof connector is fitted into the wire drawing hole. Various forms can be adopted as long as they can be protected and can be brought into close contact with the outer wall of the casing by elastic force when the waterproof connector is fitted in the wire drawing hole.

[0022]

As described above, according to the waterproof connector of the present invention, the seal member is covered and protected by the elastic cover before the waterproof connector is fitted into the wire drawing hole. As a result, the surface of the seal member does not have dust or scratches on it, and the sealing performance is not impaired. You can prevent it. Further, when the waterproof connector is fitted in the wire drawing hole, the elastic cover covers the outer periphery of the wire drawing hole to block foreign matter, so that the foreign matter is prevented from entering the inner surface of the wire drawing hole and the outer circumference of the housing. The sealing performance of the seal member is not deteriorated by entering the gap between the seal member and the surface. Further, the waterproof connector has a damper function by the elastic force of the elastic cover, and even if vibration is applied to the waterproof connector, the casing and the housing are displaced relative to each other, and the sealing member and the inner peripheral surface of the wire drawing hole are formed. Does not slide, the seal member is not worn and the sealing performance is not impaired. Therefore, it is possible to provide a good waterproof connector capable of connecting the electric wirings arranged inside and outside the casing without leaking the liquid contained inside the casing to the outside.

[Brief description of drawings]

FIG. 1 is a partially cutaway overall perspective view of a waterproof connector according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view of the waterproof connector shown in FIG.

FIG. 3 is a vertical cross-sectional view showing a mounted state of the waterproof connector shown in FIG.

FIG. 4 is a vertical sectional view of a conventional waterproof connector.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Casing 11 Hole for pulling out electric wire 20 Housing 21 Main body part 22 Connector fitting part 23 Regulation flange part 24 Recessed groove 26 Closing member 27 Liquid-tight resin 28 Locking part 30 O-ring 40 Elastic cover 51 Electrical wiring 52 Male terminal 100 waterproof connector

Claims (2)

[Claims] 1. A waterproof connector for electrically connecting electrical wirings arranged inside and outside a casing and for sealing a wire drawing hole provided in the casing, wherein the wire drawing hole is provided. And a sealing member that is mounted on the outer peripheral surface of the housing to seal the gap between the electric wire drawing hole and the housing for liquid-tightly, and the outer peripheral portion of the housing that covers the sealing member. And a tubular elastic cover that is capable of expanding and contracting in the axial direction, and when the housing is fitted in the wire drawing hole, the housing is inserted in the insertion direction rear end in the insertion direction. The waterproof connector, wherein the elastic cover sandwiched between the restriction flange portion and the casing seals the outer periphery of the wire drawing hole. 2. The waterproof connector according to claim 1, wherein the elastic cover is formed in a bellows shape.