JP4024916B2 - Waterproof stopper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a waterproof plug that provides watertightness between a wire and a wire insertion passage when the wire is connected to a terminal-connected wire and attached to a wire insertion passage of a connector housing.
[0002]
[Prior art]
Wire harnesses of automobiles are connected to lead wires of electrical equipment etc. via connectors, but if the connection location between the connectors is predicted to enter raindrops etc. from the outside, the connectors should be waterproofed It is necessary to apply. As a waterproofing treatment, there is a simple type in which a waterproof plug is attached to each electric wire and pulled into the electric wire insertion path of the connector housing.
[0003]
7 and 8 show such a conventional waterproof structure. FIG. 7 shows a waterproof plug used in the waterproof structure, and FIG. 8 shows an electric wire to the connector housing using the waterproof plug. The inserted connector is shown. As shown in FIG. 7, the waterproof plug 50 has a substantially cylindrical shape having an electric wire insertion hole 51 through which the electric wire 60 can be inserted, and is formed as an integrally molded product such as rubber. Part 53.
[0004]
Here, the terminal crimping cylinder portion 52 is a cylindrical portion that is fastened and fixed by the crimping piece 62 of the terminal 61 (see FIG. 8) together with the inserted electric wire 60. A diameter portion 54 and a diameter-enlarged portion 55 that is located at the front end of the small-diameter portion 54 and prevents the caulking piece 62 from coming off from the tightening portion are configured. The seal portion 53 is provided continuously to the rear end portion of the terminal caulking tube portion 52, and when inserted into the connector housing 70 on the outer peripheral surface thereof, the inner periphery of the wire insertion passage 71 of the connector housing 70 is provided. This is a cylindrical portion provided with a plurality of sealing annular protrusions 57 that are in close contact with the surface. In this example, the terminal 61 is a so-called male terminal. On the proximal end side, a crimping piece 62 for crimping and crimping the small diameter portion 54 of the waterproof plug 50 together with the electric wire 60 and a conductor 60b of the electric wire 60 are provided. And a crimping piece 63 electrically connected to the electric wire 60 is provided. The distal end portion 64 connected to the base end portion is a tongue-like protruding piece that protrudes from the terminal accommodating chamber 72 that communicates with the wire insertion passage 71 and is electrically connected to the female terminal.
[0005]
When the waterproof plug 50 configured as described above is attached to the electric wire 60 connected to the terminal 61 and is inserted into the electric wire insertion passage 71 of the connector housing 70, the concave portion 65 of the terminal 61 becomes the terminal accommodating chamber. By being engaged with a flexible locking piece (lance) 73 provided at 72 so that it cannot be pulled out backward, it is mounted in the electric wire insertion passage 71. In this mounted state, the waterproof plug 50 is suitably waterproofed by sealing the annular protrusion 56 for sealing against the inner peripheral surface of the wire insertion passage 71 and watertight between the wire 60 and the connector housing 70. .
[0006]
[Problems to be solved by the invention]
By the way, in such a connector, electric wires of various sizes (diameters) are used. Then, one of the three types of terminals 61 of large, medium, and small is selected by sharing those having a size of 2-3. Therefore, when the wire size is thick, as shown in FIG. 9, the ends 62a and 62a of the crimping piece 62 of the terminal 61 cannot be overlapped, and when the crimping piece 62 is narrowed down in this state, The water of the waterproof plug 50 is brought to one side along with the deformation of the crimping piece 62, and a part of the waterproof plug 50 is sandwiched between both ends 62 a and 62 a of the crimping piece 62, and the waterproof plug 50 may be damaged. There is. If it is used for a long time in such a state, the crack spreads and eventually leads to cutting, and there is a possibility that the terminal 61 and the waterproof plug 50 are separated and the waterproof plug 50 comes out of the connector housing 70.
[0007]
The present invention has been made in order to solve such problems of the prior art, and its purpose is to crimp a terminal without damaging the terminal even when crimping the terminal to a thick electric wire. It is to provide a waterproof plug.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the waterproof plug of the present invention includes a terminal crimping cylinder portion having a wire insertion hole in the shaft core and a crimping piece of the terminal being crimped and engaged at the tip, and the outer periphery of the rear end A sealing portion having an annular projection for sealing, inserting an electric wire into the electric wire insertion hole, engaging a crimping piece of the terminal with the terminal crimping cylinder portion, and inserting the crimping piece into the connector housing, In the waterproof plug in which the annular projection for sealing is brought into close contact with the waterproof plug insertion passage of the connector housing, the terminal crimping cylinder portion includes a narrow diameter portion that is tightened by the crimping piece, and the crimping portion at a front end of the narrow diameter portion. A large- diameter portion that prevents the piece from coming off, and a large number of substantially hemispherical protrusions are formed on the entire engagement surface of at least the small-diameter portion of the terminal caulking tube portion, and the caulking piece is caulked. When tightened, the protrusion is deformed to absorb the deformation amount of the crimping piece. It has to so that.
[0009]
A large number of substantially hemispherical protrusions are formed on the terminal crimping cylinder.
[0010]
According to the waterproof plug of the present invention, when the crimping piece is squeezed, each protrusion formed on the terminal crimping cylinder portion absorbs the deformation amount of the crimping piece. The flesh of the portion is not brought to one side with the deformation of the crimping piece, and there is no possibility that a part of the terminal crimping cylinder portion is sandwiched between both ends of the crimping piece. Therefore, even when the terminal crimping cylinder portion is thicker than the length of the crimping piece, the terminal crimping cylinder portion is prevented from being sandwiched between both ends of the crimping piece, and the waterproof plug is prevented from being damaged.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the waterproof plug according to the present invention will be described in detail with reference to the drawings. Prior to the description of the embodiment of the present invention, a reference example having the same configuration as that of the present invention will be described. FIG. 1 shows a first reference example of a waterproof plug according to the present invention, FIG. 2 shows a state where electric wires and terminals are assembled to the waterproof plug, and FIG. 3 shows a waterproof plug with electric wires and terminals assembled to a connector housing. It shows the assembled state.
[0012]
As shown in FIG. 1, the waterproof plug 10 has a substantially cylindrical shape having a wire insertion hole 11 through which the electric wire 60 can be inserted as a whole, and is formed as an integrally molded product such as synthetic rubber. In particular, it has two parts, a terminal crimping cylinder portion 12 and a seal portion 13. Here, the terminal crimping cylinder portion 12 is a cylindrical portion that is clamped and fixed from the outside by the crimping piece 21 (see FIG. 2) of the terminal 20 together with the electric wire 60 inserted through the electric wire insertion hole 11. A narrow-diameter portion 14 that is fastened by the crimping piece 21, and a large-diameter portion 15 that is positioned at the front end of the narrow-diameter portion 14 and prevents the caulking piece 21 from coming off from the tightening portion. . For example, six ridges 16 that are parallel to the wire insertion hole 11 are formed at equal intervals on the outer peripheral surface of the small-diameter portion 14. Although not shown, the wire insertion hole 11 is set such that its inner diameter is the smallest in the seal portion 13 and a plurality of concave and convex portions are formed along the inner peripheral surface. Yes. With such a structure, the waterproof plug 10 is configured such that the contradictory functions of the insertion property and adhesion of the electric wire 60 are simultaneously achieved. Further, the seal portion 13 is a cylindrical portion that is continuous with the rear end portion of the terminal crimping cylinder portion 12 and has annular seal projections 17 provided at three positions at regular intervals on the outer peripheral portion. The sealing annular protrusion 17 has an outer diameter dimension so as to be in close contact with the inner peripheral surface of the waterproof plug insertion passage 32 communicating with the terminal accommodating chamber 31 of the connector housing 30 (see FIG. 3). It is larger than the enlarged diameter portion 15 of the crimping cylinder portion 12.
[0013]
In this example, the terminal 20 is a so-called male terminal. On the base end side, a crimping piece 21 that holds the narrow-diameter portion 14 of the waterproof plug 10 through which the electric wire 60 is inserted, and the electric wire 60. And a crimping piece 22 which is crimped to the conductor 60b to make electrical connection with the electric wire 60, and a distal end portion 23 connected to the base end portion is a tongue-like shape fitted to the distal end of the female terminal. It is a protruding piece.
[0014]
In crimping the terminal 20 to the electric wire 60, first, the tip of the electric wire 60 is passed through the electric wire insertion hole 11 of the waterproof plug 10 with the outer covering 60a attached, and the terminal crimping cylinder portion of the waterproof plug 10 is inserted. 12 is performed with the tip of the electric wire 60 protruding by a certain length. Next, the outer sheath 60a on the distal end side of the electric wire 60 is peeled to expose the conductor 60b, and the waterproof plug 10 is placed so that the exposed conductor 60b is at the position of the crimping piece 22 of the terminal 20. The terminal 20 is vertically attached to the terminal crimping cylinder portion 12 and the conductor 60b protruding from the terminal crimping cylinder portion 12. Then, the crimping piece 21 of the terminal 20 is crimped to the terminal crimping cylinder portion 12 of the waterproof plug 10 to couple the terminal 20 to the waterproof plug 10. At that time, as shown in FIG. 4, each projection 16 is deformed to absorb the deformation amount of the crimping piece 21. Therefore, even when the terminal crimping cylinder portion 12 is thicker than the length of the crimping piece 21, the terminal crimping cylinder portion 12 is not sandwiched between the both end portions 21 a and 21 a of the crimping piece 21. Next, the crimping piece 21 is caulked to electrically connect the conductor 60 b and the terminal 20.
[0015]
Thus, the waterproof plug 10 to which the terminal 20 is coupled is inserted into the connector housing 30. The connector housing 30 is formed of synthetic resin or the like having excellent insulating properties, and is engaged with the male terminal 20 inserted into each terminal accommodating chamber 31 at a position near the tip in the terminal accommodating chamber 31. A lance 33 is provided to prevent the terminal 20 from falling behind. In this connector, the waterproof rubber plug 10 attached to the electric wire 60 connected to the terminal 20 provides waterproofing in the connector housing 30 in units of electric wires.
[0016]
In this way, when the terminal 20 connected to the tip of the electric wire 60 is inserted to the specified position of the terminal accommodating chamber 31 of the connector housing 30, the lance 33 is engaged with the recess 24 of the terminal 20, thereby At the same time, the waterproof plug 10 is press-fitted into the waterproof plug insertion passage 32, and the sealing annular projection 17 is tightly fitted to the inner peripheral surface of the waterproof plug insertion passage 32 so as to be a connector. Waterproofing between the housing 30 and the waterproof plug 10 is realized. Further, since the convex portion of the electric wire insertion hole 11 is in close contact with the outer sheath 60 a of the electric wire 60, waterproofing between the waterproof plug 10 and the electric wire 60 is also realized.
[0017]
In the first reference example , the deformation amount of the crimping piece 21 is absorbed by forming the ridge 16 on the narrow diameter portion 14 of the waterproof plug 20, and the terminal crimping cylinder portion 12 is the length of the crimping piece 21. Even when the terminal crimping cylinder portion 12 is thick, the terminal crimping cylinder portion 12 is prevented from being sandwiched between the two end portions 21a and 21a of the crimping piece 21, but the small diameter as in the second reference example shown in FIG. A groove 18a may be formed in the portion 14, and the protrusion 18 may be formed at a portion defined by the groove 18a. The outer periphery of the small-diameter portion 14 as in the embodiment of the present invention shown in FIG. A large number of hemispherical protrusions 19 may be formed on the entire surface. In short, by forming protrusions on the narrow-diameter portion 14, the deformation amount of the crimping piece 21 may be absorbed by each protrusion.
[0018]
【The invention's effect】
As is clear from the embodiment described above, in the waterproof plug according to the present invention, a large number of substantially hemispherical protrusions are formed on the small diameter part to which the crimping piece of the terminal is crimped. The amount of deformation of the crimping piece is absorbed. Therefore, even when the terminal crimping cylinder portion is thicker than the length of the crimping piece, the terminal crimping cylinder portion is prevented from being sandwiched between both ends of the crimping piece, and the waterproof plug is prevented from being damaged.
[Brief description of the drawings]
FIG. 1 is a conceptual perspective view showing a first reference example of a waterproof plug according to the present invention.
2 is a perspective view showing a state in which a wire is attached to the waterproof plug shown in FIG. 1 and a terminal is attached. FIG.
3 is a cross-sectional view showing a state where an electric wire equipped with the terminal shown in FIG. 2 is attached to a connector housing. FIG.
4 is a cross-sectional view showing a state in which a crimping piece of a terminal is crimped and crimped to a crimping tube portion of the waterproof plug shown in FIG. 1. FIG.
FIG. 5 is a conceptual perspective view showing a second reference example of the waterproof plug according to the present invention.
FIG. 6 is a conceptual perspective view showing an embodiment of a waterproof plug according to the present invention.
FIG. 7 is a perspective view of a conventional waterproof plug.
8 is a cross-sectional view of a state where an electric wire is attached to a connector housing using the conventional waterproof plug shown in FIG.
FIG. 9 is a cross-sectional view for explaining problems of the conventional waterproof plug shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Waterproof plug 11 Electric wire insertion hole 12 Terminal crimping cylinder part 13 Seal part 14 Thin diameter part 15 Wide diameter part 16 Convex strip 17 Ring-shaped protrusion 18 For convexity 18a Groove 19 Protrusion 20 Terminal 21 Crimping piece 21a End part 22 Crimp Piece 23 Tip 30 Connector housing 31 Terminal accommodating chamber 32 Waterproof plug insertion passage 33 Lance 60 Electric wire 60a Outer sheath 60b Conductor

Claims (1)

The shaft core has a wire insertion hole, and at the tip thereof is provided with a terminal crimping cylinder portion on which a crimping piece of a terminal is fastened and engaged, and a seal portion having an annular projection for sealing on the outer periphery of the rear end, The electric wire is inserted into the electric wire insertion hole, the terminal caulking piece is engaged with the terminal caulking tube portion and is inserted into the connector housing, and the sealing annular protrusion is inserted into the waterproof plug insertion passage of the connector housing. In waterproofing stoppers that are closely
The terminal crimping cylinder portion includes a narrow diameter portion that is tightened by the crimping piece, and a large diameter portion that prevents the crimping piece from coming off at a front end of the narrow diameter portion, A large number of substantially hemispherical protrusions are formed on the entire engaging surface of at least the small-diameter portion of the cylindrical portion, and when the caulking piece is caulked, the protrusion is deformed to reduce the deformation amount of the caulking piece. Waterproof stopper characterized by absorption.

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