JPH088128B2 - Waterproof connector - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a waterproof connector in which air permeability to a core portion of a coated lead wire is secured, and particularly relates to improvement of waterproofness thereof.

[Prior Art] As an exhaust gas sensor for an internal combustion engine, an air-fuel ratio sensor in which one electrode is exposed to exhaust gas and the other electrode is brought into contact with the atmosphere to form an oxygen concentration cell is used. As shown in FIG. 8, this sensor A has a core wire portion wrapped in an electrically insulating and waterproof coating used as a ventilation hole, and is covered with a reinforcing thin metal wire braid that also serves as a ground electrode. The covered lead wire B is connected. To the control electronic device C which uses the output of the sensor A as an input signal, an ordinary coated lead wire D in which a core wire made of a bundle of thin metal wires is coated with an insulating and waterproof property is connected. The sensor side lead wire B and the device side lead wire D
Are connected by a watertight fit between a waterproof connector E attached to the end of the lead wire B and a connector EF attached to the lead wire D. The sensor A includes a control electronic device C.
In the case, air is supplied through the core portion of the lead wire D, the connectors E and F, and the lead wire B while preventing water and dust from entering the sensor.

As shown in the eighth, the applicant of this patent discloses that, as shown in the eighth example, one end of the connector housing 101 is watertightly closed with a plug 102, and the end of the lead plug B is pierced through the plug 102. A waterproof connector is proposed in which the core wire and the braid are led to the inside of the housing 101 and connected to the terminal fittings 103 and 104 for fixing the inside of the housing 101, respectively (Shokai 59-43076).

[Problems to be Solved by the Invention] However, in the above-mentioned waterproof connector, since the plug body 102 is formed of the water repellent material and the fitting portion between the plug body 102 and the lead wire B is fixed by the adhesive, The waterproof pressure between the coating of the lead wire B and the plug body 102 was low, and water was likely to infiltrate into the connector under a severe usage condition in which a high water pressure was applied such as when traveling on a submerged road. Also usually connector housing 101
The plug and plug 102 are made of plastic and easily deform over time under use conditions such as the engine room of a vehicle where heat and vibration are applied, resulting in insufficient waterproof durability and semi-permanent maintenance-free performance. Absent. Further, if the connector housing is made to have a large physique and a robust structure in order to improve these performances, it causes a decrease in mountability, an increase in weight and an increase in manufacturing cost.

An object of the present invention is to increase the size of the connector housing,
In particular, increase in cross-sectional area in the direction orthogonal to the longitudinal direction (large diameter)
(EN) Provided is a waterproof type connector which can increase the waterproof pressure between the coated lead wire and the connector housing without being deteriorated and has excellent waterproof durability.

[Means for Solving the Problems] In order to achieve the above object, in a waterproof connector of the present invention, an end portion of a coated lead wire is made to face a connector housing, and the lead wire is attached to a terminal fitting held in the housing. In a waterproof connector in which the core wire is connected and the cover of the lead wire and the housing are watertightly fitted, the end portion of the lead wire is integrally molded with rubber or elastomer, and is protruded from the cover. At the protruding portion of the mold body having a small cross-sectional area (small diameter) in the direction orthogonal to the longitudinal direction of the core wire, the core wire is molded while maintaining air permeability, and at the tip of the protruding portion of the mold body. The terminal fitting was fixed, the core wire was connected to the terminal fitting, and the tip of the protruding portion of the molded body was watertightly fitted in the housing.

[Operation and Effect of the Invention] In this waterproof connector, the end portion of the coated lead wire is integrally molded with rubber or elastomer, and the core wire protruding from the coating of the lead wire is projected from the molded body. Molding is performed by holding the air permeability to the core wire portion with the projecting portion of, and the tip of the projecting portion having a small diameter of the molded body is fitted into the housing, so that the diameter of the housing is increased. Instead, the lead wire coating and the core wire are closely embedded in the mold body. Since this mold body is tightly fitted in the housing, the seal at this portion can be made strong. For this reason, since the waterproof body has a high waterproof pressure and the elastic mold body is press-fitted into the housing, the durability of the waterproof sealing property due to deformation over time is also high.

Further, the diameter of the entire waterproof connector is not increased by these.

[Embodiment] Next, the present invention will be explained based on an embodiment shown in FIG. 1 to FIG.

Reference numeral 1 denotes a waterproof connector according to the present invention, a connector housing 2 which is a plastic molded product, a coated lead wire 3 having one end connected to an exhaust gas sensor and the other end to which the connector housing 2 is attached, and the lead. The other end of the wire 3 is provided with a molded body 4 made of an elastomer such as rubber or synthetic rubber integrally molded. 5 and 6
Is a terminal fitting connected to the core wire 31 of the lead wire and the outer braid 35 of the lead wire. Elastomer is a polymeric substance that has rubber-like elasticity at room temperature and includes derivatives such as natural, synthetic, and polymer plastics.

As shown in FIGS. 2 to 4, the housing 2 has a recess 21 at one end into which the mating housing is fitted, and the recess 21 and the recess 21 are arranged side by side so as to communicate with each other.
Through holes 22 and 23. In these through holes 22 and 23, the tip ends 22A and 23A are used as fitting portions of the terminal fittings 5 and 6 having a substantially rectangular cross section, and the other rear end portions 22B and 23B are protruded from the tip of the mold body. It has a circular hole in cross section into which a small protruding part is fitted.

The lead wire 3 is composed of the core wire 31 formed by covering the outer circumference of the coil 32 with an inner braid 33 made of a fine metal wire, a plastic electrically insulating flexible covering 34 arranged on the outer circumference thereof, and an outer circumference of the covering. And an outer braid 35 made of covered metal wire. The core wire 31 is connected to the atmosphere side electrode of the exhaust sensor, and the outer braid 35 is connected to the exhaust side electrode and serves as a ground electrode. At the end of the lead wire 3, the outer braid 35 is peeled from the coating 34, and the core wire 31 is further projected from the coating 34 at the tip thereof.

As shown in FIGS. 5 to 7, the molded body 4 includes a large diameter portion 41 for molding the end portion of the lead wire 3,
A first cylindrical protruding portion 42 protruding from this large-diameter portion and having a core containing a protruding portion 31A from the coating 34 of the core wire 31, and a protruding portion parallel to the first cylindrical protruding portion 42 are provided inside the peeling portion. And a second tubular projecting portion 43 in which the stripped end portion 35A of the outer braid 35 is included. It should be noted that only the inner braid 33 of the core wire may be included in the first cylindrical protruding portion. At the tips of the first and second tubular projecting portions 42 and 43, there are provided fastening (fixing) portions 46 and 47 of terminal fittings having tip flanges 44 and 45 and having a slightly small outer diameter, and behind them. Includes a brim 48 for sealing having a ridge-shaped outer peripheral wall with a slightly large outer diameter and
49 are provided. Further, behind the large-diameter portion 41, a thin coating 40 for coating the outer braid 35 is extended.

The rear ends 51 and 61 of the terminal fittings 5 and 6 are wound around and fixed to the fastening portions 46 and 47 of the first and second cylindrical projecting portions 42 and 43 of the molded body, respectively, and the rear end portions thereof are further fixed. The leading end of the protruding portion 31A of the core wire 31 and the leading end of the peeling end portion 35A of the outer braid 35 are held by the crimped portions 52 and 62 adjacent to the crimped portions 52 and 62, and are fixed and connected by crimping. Further, the terminal fittings 5 and 6 are the first and the second of the molded body.
Together with the cylindrical projections 42 and 43 of the housing through hole 2
Inserted from the rear end into 2 and 23, terminal fittings 5 and 6
The intermediate portions 54 and 64 with the locking claws 53 and 63 are fitted into the tip portions 22A and 23A of the through holes, and the tip portions 55 and
65 projects into the recess 21 of the housing.

Further, in the first and second cylindrical projecting portions 42 and 43 of the mold body, the sealing brim portions 48 and 49 are firmly fitted in the rear end portions 22B and 23B of the through holes.

In addition, as shown in FIG.
To the end of the fitting part that is fitted into the housing from
The distance L to 48 and 49 and the outer diameter D thereof are preferably L> 2D. Thereby, the vibration of the engine is absorbed in this portion, and it is prevented that a strong vibration is constantly applied to the fitting portion, and the durability is improved.

In the present invention, the coated lead wire may have a structure in which a core wire formed by bundling a large number of fine wires made of a good conductor is provided with a waterproof insulating coating, and in this case, the protruding portion protruding from the mold body is They are unitary, and if necessary, they are juxtaposed and fitted into the connector housing.

The outer braid 35 has its peeling portion 35A and the outer braid 35, and since it is molded with the molding body, the watertightness is greatly enhanced, and there is no leakage for water pressure of about 1 kg / cm ^2. There is. However, depending on the place of use,
More water tightness may be required. In that case, water-tightness at a higher pressure can be obtained by filling solder or the like into either the peeling portion 35A or the portion 35B in the mold (FIG. 1) or both to solidify or mold the mesh. . Instead of solder, the portion may be filled with a molding material in advance and the mesh may be molded separately.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a waterproof connector of the present invention, FIG.
FIG. 4 is a left side view of the connector housing, FIG. 3 is a front view thereof, FIG. 4 is a right side view thereof, FIG. 5 is a left side view of the lead wire molded body, and FIG. FIG. 7 is a front view thereof, and FIG. 8 is a sectional view of a conventional waterproof connector. In the figure, 1 ... Waterproof connector, 2 ... Connector housing, 3 ... Coated lead wire, 4 ... Molded body, 5,6 ...
… Terminal fittings, 31 …… Core wire, 34 …… Coating, 42,43 …… Projections with small diameter

Claims (4)

[Claims] 1. A connector housing is made to face an end of a coated lead wire, a core of the lead wire is connected to a terminal fitting held in the housing, and the coating of the lead wire and the housing are water-tightly fitted. In a waterproof type connector to be worn, the end portion of the lead wire is integrally molded with rubber or elastomer, and the core wire projected from the coating,
The projecting portion of the molded body having a small diameter is molded while maintaining air permeability to the core wire, the terminal metal fitting is fixed to the tip of the projecting portion of the mold body, and the core wire is fixed to the terminal metal fitting. And a tip of a protruding portion of the mold body is watertightly fitted in the housing. 2. The lead wire has an outer braid of a fine metal wire covered on the outer periphery of the coating, and the mold body has a large-diameter portion formed by molding the end portion of the lead wire and a protrusion from the large-diameter portion. A cylindrical first small-diameter protruding portion provided with a core wire projecting from the coating and having the core portion serving as an air passage, and the large-diameter portion to the first small-diameter portion. And a columnar second small-diameter projecting portion that projects in parallel with the projecting portion and that includes an outer braid peeled from the coating in the core portion, The core wire and the outer braid are connected to the respective terminal fittings while being fixed to the respective tips of the second small diameter projecting portions, and the housing is fitted with the first and second small diameter projecting portions. Claim 2 characterized in that it has two through holes arranged side by side. Waterproof connector. 3. The protruding portion of the mold body has a cylindrical shape, and the length from the root to the end of the fitting portion fitted into the housing is at least twice the diameter of the protruding portion. The waterproof connector according to claim 1 or 2, characterized in that. 4. An outer braid or at least one of its exfoliated portions is solidified with solder, or is pre-molded alone, and then the molded body of the preceding paragraph is formed. The waterproof connector according to any one of items.