JP4763427B2 - Wire seal member - Google Patents

Description

  The present invention relates to a wire seal member that is used, for example, in a connector of an automobile wire harness and prevents water from entering the housing.

  As shown in FIG. 5, the housing 1 of the conventional electrical connector is provided with a plurality of terminal accommodating holes 2, and the terminal accommodating holes 2 accommodate the connection terminals 4 connecting the electric wires 3 to the rear part. . And between the terminal accommodation hole 2 and the electric wire 3, the sealing member 5 inserted and attached to the electric wire 3 is press-fitted, and the water permeation into the housing 1 from the outside is prevented.

  However, when the connection terminal 4 is inserted into the terminal accommodating hole 2, it is difficult to insert the connection terminal 4 while rotating the connection terminal 4 in the correct direction, for example, because the wire 3 is difficult to grip when it is hard or short. It is.

  Further, when the electric wire 3 is abruptly bent from the base at the end of the housing 1 with the connection terminal 4 inserted into the housing 1, between the seal member 5 and the electric wire 3 or between the seal member 5 and the terminal accommodating hole 2. There is a possibility that a gap is formed and water easily enters.

  An object of the present invention is to provide an electric wire seal member that solves the above-described problems and that can securely grip even a hard or short electric wire and that the electric wire is not easily bent at the end of the housing.

An electric wire seal member according to the present invention for achieving the above object is an electric wire seal member that is inserted into an electric wire connected to a connection terminal and press-fitted together with the electric wire into a terminal accommodating hole of the housing, and is made of a cylindrical synthetic resin The core member is composed of an elastic member having a sealing function, and the elastic member is attached to both the front and rear ends of the core member, and the crimping portion of the connection terminal is fixed to the front end portion of the core member. A plurality of notches are provided in the longitudinal direction at the rear end of the core member to which the elastic member is not attached, and the rear end extends to the outside rear of the housing when press-fitted into the terminal receiving hole. characterized by standing.

  The electric wire seal member according to the present invention can grip the electric wire via the core material by extending the rear end portion of the core material and providing the cut portion, and can bend the electric wire outside the housing. Can be prevented.

The present invention will be described in detail based on the embodiment shown in FIGS.
FIG. 1 shows a cross-sectional view of a connector housing 11 made of a synthetic resin used in, for example, an automobile wire harness. In the housing 11, a plurality of terminal receiving holes 12 are formed, for example, in two upper and lower stages. Yes. The cross-sectional shape of the rear part of the terminal accommodating hole 12 is substantially circular, and a flexible arm 14 having a locking claw 13 is formed in the terminal accommodating hole 12 obliquely forward.

  The terminal accommodating hole 12 accommodates a connection terminal 16 connected to the rear portion of the electric wire 15 and is locked by a locking claw 13 of the flexible arm 14 so as not to come out of the housing 11. A substantially cylindrical sealing member 18 is inserted on the covering 17 of the electric wire 15 for waterproofing, and is in close contact with the covering 17 and is also in close contact with the peripheral wall portion of the rear portion of the terminal accommodating hole 12.

  FIG. 2 is a perspective view of the seal member 18, and FIG. 3 is a cross-sectional view thereof. The seal member 18 has an elastic surface made of, for example, synthetic rubber on the inner and outer surfaces of the central portion of the cylindrical core member 21 made of synthetic resin. The member 22 is pasted by injection molding. The core member 21 is provided with a plurality of holes 23, the elastic member 22 is integrated on the inner and outer surfaces, and the corrugated portions 24 and 25 are provided on both the inner and outer surfaces to make it difficult for water to enter. Yes.

  The front end portion of the core member 21 is covered with an elastic member 22 and is formed into a cylindrical portion 27 having an annular portion 26 made of the elastic member 22 at the tip, and the cover crimping portion 16a of the connection terminal 16 is caulked as shown in FIG. The seal member 18 is made difficult to come off from the connection terminal 16. In addition, two notches 29 are formed in the longitudinal direction from the rear in the rear end portion 28 of the core member 21 that is not attached to the elastic member 22 and is not accommodated in the housing 11. Furthermore, a plurality of ribs 30 are formed on the outer periphery of the rear end portion 28 of the core member 21 so as to make it easier to grip the core member 21, and the inner wall of the rear end portion 28 is used to hold the electric wire 15. A hemispherical wire pressing portion 31 protrudes inward. Further, a taper portion 32 is formed on the surface between the rear end portion 28 of the core member 21 and the elastic member 22 so as to expand rearward.

  The electric wire sealing member configured in this manner holds the electric wire 15 by pinching the rear end portion 28 of the core member 21 and pressing it as shown by the arrow in FIG. 4 when inserting the connection terminal 16 into the terminal accommodating hole 12. By gripping, the connection terminal 16 can be easily inserted into the terminal receiving hole 12 of the housing 11 in the correct orientation.

  Further, due to the presence of the rear end portion 28, the electric wire 15 is not suddenly bent outside the housing 11. Furthermore, if the tapered portion 32 is not visible in the housing 11, it can be confirmed that the connection terminal 16 has been inserted to the correct position.

  Further, when it becomes necessary to pull out the connection terminal 16 from the housing 11 for some reason, the engagement of the engagement claw 13 with the engagement claw 13 is released by a jig, and the rear end portion 28 of the seal member 18 is gripped. Thus, the connection terminal 16 can be pulled out to the rear of the housing 11. Note that the number of the cut portions 29 provided in the rear end portion 28 of the core material 21 is not limited to two, and may be three or more.

It is sectional drawing of the state which press-fitted the connection terminal in the housing. It is a perspective view of an electric wire seal member. It is sectional drawing. It is sectional drawing of the state which attached the electric wire to the connection terminal. It is sectional drawing of the state which press-fit the connection terminal of the prior art example in the housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Housing 12 Terminal accommodation hole 15 Electric wire 16 Connection terminal 17 Cover 18 Seal member 21 Core material 22 Elastic member 28 Rear end part 29 Cut part 30 Rib 31 Electric wire holding part 32 Tapered part

Claims (5)

A wire seal member that is inserted into an electric wire connected to a connection terminal and press-fitted into the terminal receiving hole of the housing together with the electric wire, and includes a core material made of a cylindrical synthetic resin and an elastic member having a sealing function, The elastic member is attached to both the inner and outer surfaces of the front end portion and the central portion of the material, the crimping portion of the connection terminal is fixed to the front end portion of the core member, and the rear end portion of the core member not attached to the elastic member longitudinally provided with a plurality of notches, wire seal member the rear end when press-fitted into the terminal accommodating hole, characterized in that extending outside the rear of the housing.   The wire seal member according to claim 1, wherein a rib for facilitating gripping of the rear end portion is formed on an outer periphery of the rear end portion of the core material.   The electric wire seal member according to claim 1 or 2, wherein a protruding electric wire pressing portion for pressing an electric wire is formed on an inner wall of a rear end portion of the core member.   The taper part is formed near the said center part of the rear-end part of the said core material, The insertion state to the said housing of the said core material is confirmed by this taper part, The Claims 1-3 characterized by the above-mentioned. The electric wire seal member according to any one of claims.   The wire seal member according to any one of claims 1 to 4, wherein the elastic member is made of synthetic rubber.

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