JP2982101B2 - Waterproof rubber stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof rubber which is attached to an insulated wire to which a terminal is crimped at the end and which is waterproof when the terminal at the end of the insulated wire is mounted in a terminal receiving hole of a connector housing. It is about a stopper.

[0002]

2. Description of the Related Art An end portion of a wire harness of an automobile or the like is connected to a lead wire of an electric device or the like via a connector. In the case where a raindrop or the like is expected to enter, waterproof treatment may be applied when wiring is connected by a connector. As the waterproofing treatment, the entire connector may have a waterproof structure, or a waterproof rubber plug attached to the electric wire may be used to waterproof the electric wire drawn into the connector.

FIGS. 4 and 5 show a conventional example of a waterproof rubber plug 2 to be attached to a covered electric wire 1 and a waterproof structure of a connector 3 using the waterproof rubber plug 2. FIG. The waterproof rubber plug 2 is disclosed in Japanese Utility Model Laid-Open Publication No. 63-3074, and has a substantially cylindrical shape through which the covered electric wire 1 can be inserted as shown in FIG. Although formed as a product, it is functionally provided with three parts: a front tube part 5, an intermediate tube part 6, and a rear tube part 7.

Here, the front tubular portion 5 is a tubular portion which is fastened and fixed together with the inserted electric wire 1 by a caulking piece 10 of a terminal 9 (see FIG. 5). The small-diameter portion 11 includes a large-diameter portion 12 that is located at the front end of the small-diameter portion 11 and prevents the caulking piece 10 from coming off the tightening portion.

The intermediate cylindrical portion 6 is provided so as to be continuous with the rear end of the front cylindrical portion 5, and has an outer peripheral portion provided with an inner peripheral portion of a terminal receiving hole 15 of a connector housing 14 for receiving and holding the terminal 9. The annular projections 16 that are in close contact with the surface
This is a cylindrical portion provided with a plurality of annular inner wall projections 17 provided at regular intervals on the inner wall 19a of the intermediate cylindrical portion 6 and in close contact with the outer coating 18 of the electric wire 1. The outer diameter of the annular projection 16 is larger than the enlarged diameter portion 12 of the front tubular portion 5, and the inner diameter of the annular inner wall projection 17 is set smaller than the diameter of the electric wire.

The rear cylinder 7 is provided with the intermediate cylinder 6
And is a tubular portion that is provided continuously with the rear end portion and that fits tightly into the outer sheath 18 of the inserted electric wire 1. The waterproof rubber plug 2 is formed with an electric wire insertion hole 19 through which the covered electric wire 1 is inserted together with the outer sheath 18 through the front tubular portion 5, the intermediate tubular portion 6, and the rear tubular portion 7. The diameter of the electric wire insertion hole 19 is set to be smaller than the electric wire diameter at the rear cylindrical portion 7. This is to ensure watertightness between the insulated wire 1 and the insulated wire 1 by closely fitting the insulated wire 18 to the outer sheath 18.

In this case, the terminal 9 is a so-called male terminal, and a crimping piece 10 for gripping a small-diameter portion 11 of the waterproof rubber plug 2 through which the coated electric wire 1 is inserted is provided at the base end side. When,
A crimping piece 22 that is crimped to the conductor 21 of the covered electric wire 1 to perform an electrical connection with the covered electric wire 1;
The distal end portion 23 connected to the base end portion is a tongue-shaped protruding piece that fits both ends of the female terminal.

The crimping of the terminal 9 to the covered electric wire 1 is performed by first penetrating the end of the covered electric wire 1 through the waterproof rubber plug 2 with the outer sheath 18 attached thereto. The end of the covered electric wire 1 is made to protrude from the part 5 by a certain length. Next, the outer sheath 18 on the distal end side of the insulated wire 1 is peeled to expose the conductive wire portion 21, and the exposed conductive wire portion 21 is attached to the crimping piece 22 of the terminal 9.
The terminal 9 is longitudinally attached to the front tubular portion 5 of the waterproof rubber plug 2 and the conductive wire portion 21 protruding from the front tubular portion 5 so that the terminal 9 comes to the position. Then, the terminal 9 is mechanically fixed to the waterproof rubber plug 2 and the insulated wire 1 by first caulking the caulking piece 10, and then the crimping piece 22 is caulked to electrically connect the insulated wire 1 and the terminal 9. Connected state.

On the other hand, at a position near the distal end of the terminal accommodating hole 15 of the connector 3, a locking projection (a lance) for preventing the terminal 9 from coming off by engaging with the terminal 9 inserted into the terminal accommodating hole 15. ) 25 are equipped.

Therefore, when the terminal 9 connected to the end of the insulated wire 1 is inserted to the specified position of the terminal receiving hole 15 of the connector housing 14, the locking projection 25 is engaged with a predetermined portion of the terminal 9. At the same time, the terminal 9 is prevented from coming off, and at the same time, the annular projection 16 of the waterproof rubber plug 2 is tightly fitted to the inner peripheral surface of the terminal receiving hole 15 so that the terminal receiving hole 15 and the waterproof rubber plug 2 Between the annular inner wall projection 17 and the rear tubular portion 7 and the covered electric wire 1.
The waterproofing between the waterproof rubber plug 2 and the covered electric wire 1 is also realized by the close contact with the outer covering 18, and as a result, the waterproofing of the connector 3 at the insertion portion of the covered electric wire 1 is realized.

[0011]

By the way, the rear tubular portion 7 of the waterproof rubber plug 2 is bent in order to ensure waterproofness when the coated electric wire 1 drawn from the connector 3 is bent in an arbitrary direction. It is desirable that the flexibility is appropriately increased so that the stress does not reach the intermediate cylindrical portion 6 of the waterproof plug and the adhesiveness to the external coating of the electric wire 1 is ensured.

However, the rear tubular portion 7 is a portion which is tightly fitted to the covered electric wire 1, and if only the flexibility is improved by simply reducing the thickness of the peripheral wall, as shown in FIG. When inserting the electric wire 1 into the waterproof rubber plug 2, there is a problem that the rear tubular portion 7 bends and the insertion work of the covered electric wire 1 becomes difficult.

Such bending of the rear cylindrical portion 7 occurs particularly remarkably when the waterproof rubber plug 2 and the insulated wire 1 are butted against each other with their center axes shifted from each other. When inserting 1 into the waterproof rubber stopper 2, it is necessary to carefully align the respective center axis positions and perform the insertion work.
This was also desired as a cause of the work delay.

[0014] Therefore, an object of the present invention is to solve the above problems, and when inserting a covered electric wire into a waterproof rubber plug,
Deflection that hinders the insertion operation into the rear cylindrical portion of the waterproof rubber plug is unlikely to occur, and it is not necessary to particularly perform an operation of precisely aligning the center axes of the waterproof rubber plug and the covered electric wire, and the sheath is easily and quickly covered. An object of the present invention is to provide a waterproof rubber stopper capable of completing insertion of an electric wire.

[0015]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a front tubular portion which has a substantially cylindrical shape through which a covered electric wire can be inserted, and which is fixed together with the inserted electric wire by a crimping piece of a terminal. An intermediate cylindrical portion provided continuously with a rear end portion of the front cylindrical portion and having an annular projection provided on an outer peripheral portion thereof in close contact with an inner peripheral surface of a terminal accommodating hole of the connector housing for accommodating and holding the terminal; And a rear tubular portion which is provided continuously with the rear end of the portion and closely fits into the outer coating of the inserted electric wire, and is inserted into the inner peripheral surface of the terminal receiving hole and the terminal receiving hole. A waterproof rubber plug for waterproofing between the electric wires provided, and ridges extending linearly along the axial direction of the rear cylinder portion are provided on the outer periphery of the rear cylinder portion at appropriate intervals in the circumferential direction. This is achieved by a waterproof rubber stopper characterized in that it is provided.

The ridge has a projecting end projecting rearward from a rear end of the rear tubular portion, and the projecting end is provided with an end of a covered electric wire to be inserted into the waterproof rubber plug. The above object can also be achieved by a configuration in which a tapered surface serving as a guide surface for guiding into the rear cylindrical portion is provided.

[0017]

According to the above construction of the present invention, the ridge provided linearly along the axial direction on the outer peripheral portion of the rear tubular portion reinforces the rear tubular portion in the axial direction, thereby providing a waterproof rubber plug. When the covered electric wire is inserted into the rear tubular portion, the rear tubular portion is prevented from bending. In addition, since the ridges provided on the outer peripheral portion of the rear tubular portion are spaced apart from each other at appropriate intervals in the circumferential direction, adhesion to the covered electric wire due to thinning of the peripheral wall of the rear tubular portion is improved. The flexibility makes it possible to improve the rigidity of the rear tubular portion at the time of inserting the covered electric wire without sacrificing much, and it is possible to easily insert the covered electric wire into the waterproof rubber plug.

In addition, if the protrusion provided on the outer peripheral portion of the rear cylindrical portion is provided with a projecting end, and the projecting end is provided with a tapered surface for guiding the coated electric wire into the rear cylindrical portion, the tapered surface is used. Therefore, the center axis positions of the waterproof rubber plug and the insulated wire are automatically aligned, so that there is no need to perform an operation of precisely aligning the center axes of the waterproof rubber plug and the insulated wire with each other. In addition, it is possible to complete the insertion of the covered electric wire quickly.

[0019]

1 to 3 show one embodiment of a waterproof rubber stopper according to the present invention. FIG. 1 shows a waterproof rubber stopper 3 of one embodiment.
FIG. 2 is a perspective view showing a waterproof structure of the connector 3 using the “0”.
And FIG. 3 are each a longitudinal sectional view showing the configuration of the waterproof rubber plug 30 of one embodiment.

The connector 3 has a connector housing 14 made of synthetic resin having excellent insulation properties and a suitable number of terminal receiving holes 15 arranged in a row. An engaging projection (lance) 25 for preventing the terminal 9 from coming off by engaging with the male terminal 9 inserted into the terminal receiving hole 15 is provided. And
In this connector 3, the waterproof rubber plug 30 attached to the covered electric wire 1 connected to the base end of the terminal 9 waterproofs the electric wire inserted into each terminal accommodating hole 15. As shown in FIGS. 2 and 3, the waterproof rubber plug 30 has a substantially cylindrical shape through which the covered electric wire 1 can be inserted, and is formed as an integrally molded product such as synthetic rubber. Specifically, three parts are provided: a front cylinder part 5, an intermediate cylinder part 6, and a rear cylinder part 7.

Here, the front tubular portion 5 is a tubular portion that is fastened and fixed together with the inserted electric wire 1 by a crimping piece 10 (see FIG. 1) of the terminal 9. As shown in FIG. A small-diameter portion 11 fastened by the caulking piece 10;
An enlarged diameter portion 12 is provided at the front end of the small diameter portion 11 to prevent the caulking piece 10 from coming off from the tightened portion.

The intermediate cylindrical portion 6 is provided so as to be continuous with the rear end of the front cylindrical portion 5, and has an outer peripheral portion provided with an inner peripheral portion of a terminal receiving hole 15 of a connector housing 14 for receiving and holding the terminal 9. The annular projections 16 that are in close contact with the surface
This is a cylindrical portion provided with a plurality of annular inner wall projections 17 provided at regular intervals on the inner wall 19a of the intermediate cylindrical portion 6 and in close contact with the outer coating 18 of the electric wire 1. The outer diameter of the annular projection 16 is larger than the enlarged diameter portion 12 of the front cylindrical portion 5, and the inner diameter of the annular inner wall projection 17 is set smaller than the diameter of the electric wire 1.

The rear cylinder 7 is provided with the intermediate cylinder 6
And a thin cylindrical portion closely fitted to the outer sheath 18 of the inserted electric wire 1. On the outer periphery of the rear tubular portion 7, three protrusions 33 are provided at equal intervals in the circumferential direction. Here, each of the protrusions 33 is linearly extended along the axial direction of the rear tubular portion 7.

The ridge 33 has a projecting end 34 projecting rearward from the rear end of the rear tubular portion 7. The projecting end 34 has a coating to be inserted into the waterproof rubber plug 30. A tapered surface 35 serving as a guide surface for guiding the end of the electric wire 1 into the rear tubular portion 7 is provided.

The waterproof rubber plug 30 is provided with an electric wire insertion hole 19 through which the coated electric wire 1 is inserted together with the outer coating 18 thereof.
Is formed so as to penetrate the front tubular portion 5, the intermediate tubular portion 6, and the rear tubular portion 7. The diameter of the electric wire insertion hole 19 is set to be the smallest in the portion of the rear tubular portion 7. I have. This is to ensure watertightness between the insulated wire 1 and the insulated wire 1 by closely fitting the insulated wire 18 to the outer sheath 18.

In this case, the terminal 9 is a so-called male terminal, and a crimping piece 10 for holding the small-diameter portion 11 of the waterproof rubber plug 30 through which the coated electric wire 1 is inserted is provided on the base end side.
And a crimping piece 22 that is crimped to the conductor 21 of the covered electric wire 1 to make an electrical connection with the covered electric wire 1. The distal end 23 connected to the base end is provided with a distal end of the female terminal. It is a tongue-shaped protruding piece that fits both sexes.

The crimping of the terminal 9 to the insulated wire 1 is performed by first passing the tip of the insulated wire 1 through the waterproof rubber plug 30 with the outer sheath 18 attached thereto.
The front end of the covered electric wire 1 is made to protrude by a certain length from the front cylindrical portion 5 of the wire. Next, the outer sheath 18 on the distal end side of the insulated wire 1 is peeled off to expose the conducting wire portion 21, and the waterproofing is performed so that the exposed conducting wire portion 21 comes to the position of the crimping piece 22 of the terminal 9. The terminal 9 is longitudinally attached to the front cylindrical portion 5 of the rubber plug 30 and the conductor 21 protruding from the front cylindrical portion 5. Then, the crimping piece 10 is crimped first to mechanically fix the terminal 9 to the waterproof rubber plug 30 and the covered electric wire 1, and then the crimping piece 22 is crimped.
The insulated wire 1 and the terminal 9 are electrically connected.

The terminal 9 connected to the end of the insulated wire 1 in this manner is connected to the terminal receiving hole 15 of the connector housing 14.
When the locking projection 25 is engaged with a predetermined portion of the terminal 9, the terminal 9 is prevented from coming off, and at the same time, the annular projection 16 of the waterproof rubber plug 30 is The terminal fitting hole 15 and the waterproof rubber plug 30 are tightly fitted to the inner peripheral surface of the receiving hole 15 to realize waterproof between the terminal receiving hole 15 and the waterproof rubber plug 30. Waterproof rubber stopper 30 due to close contact with outer coating 18
The waterproofing between the connector 3 and the insulated wire 1 is also realized.

By the way, the waterproof rubber plug 3 of the above embodiment is
0, a ridge 33 provided on the outer peripheral portion of the rear tubular portion 7
Reinforces the rear tubular portion 7 in the axial direction thereof, and suppresses the occurrence of bending of the rear tubular portion 7 when the covered electric wire 1 is inserted into the waterproof rubber plug 30.

Moreover, the projecting ridges 33 provided on the outer peripheral portion of the rear tubular portion 7 are spaced apart from each other in the circumferential direction, so that the covered electric wire is formed by making the peripheral wall of the rear tubular portion 7 thinner. 1
The rigidity of the rear tubular portion 7 at the time of insertion of the insulated wire 1 can be improved without sacrificing the adhesion and flexibility to the waterproof wire plug 30. Work can be facilitated.

Moreover, the projecting end portion 34
The overhanging end 34 is provided with a tapered surface 35 for guiding the covered electric wire 1 into the rear tubular portion 7. When the covered electric wire 1 is inserted, as shown in FIG.
As a result, the center axis position of the waterproof rubber plug 30 and the insulated wire 1 is automatically aligned, and the waterproof rubber plug 3
It is not necessary to perform an operation of precisely aligning the center axes of the 0 and the covered electric wire 1 with each other, and it is possible to complete the insertion of the covered electric wire more simply and quickly.

The specific structure of the connector 3 in which the waterproof rubber plug 30 of the present invention is used and the structure of the terminal 9 are not limited to those of the embodiment. For example, the rear tubular portion 7 of the waterproof rubber stopper is not necessarily entirely covered with the outer coating 1 of the electric wire 1.
8 does not need to be in close contact with the annular inner wall projection 1 of the intermediate cylindrical portion 6.
As in the case of 7, the inner wall of the rear tubular portion 7 may be provided with a plurality of annular inner wall projections and brought into close contact with the outer coating 18.

[0033]

According to the waterproof rubber plug of the present invention, the ridge provided linearly along the axial direction on the outer peripheral portion of the rear cylindrical portion reinforces the rear cylindrical portion in the axial direction. When the covered electric wire is inserted through the waterproof rubber plug, the occurrence of bending in the rear tubular portion is suppressed. Moreover, since the ridges provided on the outer peripheral portion of the rear tubular portion are spaced apart from each other in the circumferential direction at appropriate intervals, it is possible to improve the adhesion to the covered electric wire by reducing the thickness of the peripheral wall of the rear tubular portion. Flexibility, without sacrificing much,
The rigidity of the rear tubular portion at the time of inserting the covered electric wire can be improved, and the work of inserting the covered electric wire into the waterproof rubber plug can be facilitated. Moreover, if the protrusion provided on the outer peripheral portion of the rear tubular portion is provided with a projecting end, and the projecting end is provided with a tapered surface for guiding the coated electric wire into the rear tubular portion, the waterproofing is achieved by the tapered surface. The center axis position of the rubber plug and the insulated wire is automatically aligned, eliminating the need to perform special operations to accurately align the center axes of the waterproof rubber plug and the insulated wire, making it easier and faster. It is possible to complete the insertion of the covered electric wire.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view of a waterproof rubber plug according to one embodiment of the present invention.

FIG. 3 is another vertical sectional view of the waterproof rubber plug according to the embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a conventional waterproof rubber stopper.

FIG. 5 is an explanatory view of a waterproof structure of a connector using a conventional waterproof rubber stopper.

FIG. 6 is a schematic diagram for explaining a disadvantage when an electric wire is inserted into a conventional waterproof rubber plug.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulated wire 3 Connector 5 Front cylinder part 6 Middle cylinder part 7 Rear cylinder part 9 Terminal 10 Caulking piece 11 Small diameter part 12 Large diameter part 14 Connector housing 15 Terminal accommodation hole 16 Annular projection 19 Electric wire insertion hole 30 Waterproof rubber plug 33 Ridge 34 overhanging end 35 tapered surface

Claims (2)

(57) [Claims] 1. A front tubular portion which has a substantially cylindrical shape through which a covered electric wire can be inserted, is fastened and fixed by a crimping piece of a terminal together with the inserted electric wire, and is provided continuously with a rear end portion of the front tubular portion. And an outer peripheral portion provided with an intermediate cylindrical portion provided with an annular projection which is in close contact with the inner peripheral surface of the terminal housing hole of the connector housing for housing and holding the terminal, and provided at a rear end of the intermediate cylindrical portion. Waterproof rubber for waterproofing between the inner peripheral surface of the terminal accommodating hole and the electric wire inserted into the terminal accommodating hole by forming a structure having a rear tubular portion that fits tightly to the outer sheath of the inserted electric wire. A plug, on the outer periphery of the rear tubular portion , along the axial direction of the rear tubular portion.
A waterproof rubber plug, wherein linearly extending protrusions are provided at appropriate intervals in a circumferential direction. 2. The ridge has a projecting end projecting rearward from a rear end of the rear tubular portion, and an end of a covered electric wire to be inserted into the waterproof rubber plug is provided at the projecting end. The waterproof rubber plug according to claim 1, further comprising a tapered surface serving as a guide surface for guiding into the rear cylindrical portion.