JP5450117B2 - Rubber stopper and waterproof connector - Google Patents

Description

  The present invention relates to a rubber plug and a waterproof connector using the rubber plug.

  Conventionally, what was described in patent document 1 is known as an example of the waterproof connector which aimed at individual waterproofing. This is a rubber in which a wire barrel of a terminal fitting is crimped to the end of a core wire in an electric wire in which a metal core wire is covered with an insulating coating, and a lip is provided around the outer peripheral surface of the terminal end of the insulating coating. The insulation barrel of the terminal fitting is pressure-bonded to the mounting cylinder part provided on the front end side of the rubber stopper and the end of the insulation coating, and the terminal fitting is placed in the cavity provided in the connector housing. As a result, the rubber plug is fitted into the rear end portion of the cavity, and the lip is sealed by elastically contacting the inner peripheral surface of the cavity. Further, in order to keep the insertion resistance of the rubber plug small, a guide portion having a tapered shape is provided at the rear end of the cavity.

  By the way, in the field of automobile wire harnesses, aluminum wires have been used for the purpose of reducing the weight of the wires. Aluminum wires have a core wire made of aluminum or aluminum alloy, but they don't like the formation of a strong oxide film on the surface of the core wire, and a wire barrel is crimped to the core wire to connect the terminal fitting to the terminal. In such a case, there is a concern that the contact resistance increases due to the presence of an oxide film between the two. For this reason, the oxide film is broken and peeled by crimping the wire barrel with high compression, and the exposed new surface of the core wire is brought into contact with the inner surface of the wire barrel so that the contact resistance is reduced, that is, the electrical performance is improved. Yes. However, when the wire barrel is crimped with high compression, the crimped portion and thus the entire terminal fitting extend in the axial direction, and as a result, it is inevitable that the position of the rubber plug crimped by the insulation barrel is shifted backward.

JP 2002-280108 A

  In addition to the above, there are the following circumstances when the rubber plug is pressure-bonded together with the end of the insulation coating with the insulation barrel. In other words, it is quite difficult to accurately position and fit the rubber plug with respect to the end of the insulation coating. Therefore, normally, the mounting cylinder provided at the front end of the rubber plug has a margin in the axial length The insulation barrel is formed to be long so that the insulation barrel can be securely crimped to the mounting cylinder even if the fitting position of the rubber plug is slightly deviated.

  Here, if the fitting position of the rubber plug is shifted rearward, the insulation barrel will be crimped to the front end of the mounting cylinder, but in that case, the rubber plug itself will be rearward with respect to the terminal fitting. It will be in a shifted state. In addition, when the insulation barrel is crimped to the mounting cylinder, the mounting cylinder is elongated in the axial direction. However, if the insulation barrel is crimped to the front end of the mounting cylinder as described above, The tube portion mainly extends rearward, and the rubber stopper is pushed further rearward. The higher the compression of the insulation barrel in order to obtain a higher holding force, the greater the elongation.

If the above conditions overlap, even if the terminal fitting is inserted to the proper position in the cavity, the rubber plug will remain considerably behind the normal fitting position. The lip thus retracted to the position of the guide portion, and there was a risk that the sealing performance would be impaired due to insufficient amount of lip compression.
In addition, when copper wire is used for the electric wire, there is a similar concern that the rubber plug will shift backward when the rubber plug mounting cylinder is crimped by the insulation barrel, depending on the conditions such as the shape of the housing cavity. There is a risk that the sealing performance may be lowered.
The present invention has been completed based on the above circumstances, and an object of the present invention is to ensure the sealing of the cavity by the rubber plug.

The rubber plug of the present invention is fixed to the terminal of the electric wire together with the terminal fitting, and is fitted on the rear end portion of the cavity as the terminal fitting is inserted into the cavity of the connector housing, and is provided on the outer peripheral surface. A rubber plug in which a lip is elastically adhered and sealed to the inner peripheral surface of the cavity, and the rubber plug is fitted to an end of the insulation coating on the electric wire, and the terminal fitting is also connected to the end of the insulation coating A mounting cylinder part to which the insulation barrel provided on the pressure-bonding part is crimped is provided, and a portion of the mounting cylinder part that is caulked to the insulation barrel is formed in a form that is divided into a high compression part and a low compression part in the axial direction. And the high compression portion is arranged on the front side.

In the waterproof connector of the present invention, a wire barrel of a terminal fitting is crimped to an end of the core wire in an electric wire in which a metal core wire is covered with an insulation coating, and a lip is provided on an outer peripheral surface of the end of the insulation coating. An insulation barrel of the terminal fitting is pressure-bonded to the mounting tube portion provided on the rubber stopper and the end of the insulating coating, and the terminal fitting is connected to the connector. As the rubber stopper is inserted into the cavity provided in the housing, the rubber plug is fitted to the rear end of the cavity so that the lip is in close contact with the inner peripheral surface of the cavity for sealing. in the waterproof connector that, a portion caulked to the insulation barrel of the mounting cylinder portion of the rubber plug is divided into a high compression portion and a low compression portion in the axial direction Having characterized in that formed in the state, and high compression portion is disposed on the front side.

According to the above configuration, when the insulation barrel is pressure-bonded to the front side of the portion of the mounting cylinder portion that is crimped to the insulation barrel, the position of the rubber plug is shifted to the rear to some extent. Although it cannot be avoided, about the extension of the attachment cylinder part accompanying crimping | compression-bonding, the front high compression part is mainly crimped | bonded, and it is controlled that a rubber stopper is pushed back further. Therefore, the position of the lip of the rubber stopper remains on the sealing surface side of the cavity, and a reliable seal is taken.

In addition, it is good also as following structures.
(1) The high compression part of the attachment cylinder part in the rubber plug is formed by expanding the outer periphery of the attachment cylinder part or reducing the inner periphery. The outer periphery of the mounting cylinder portion is enlarged, that is, thickened to form a high compression portion. When the inner circumference of the mounting cylinder portion is reduced in diameter, a portion with the reduced diameter is raised and expanded in diameter as the insulation coating of the electric wire is inserted to form a high compression portion. .

(2) The high compression portion of the mounting tube portion in the rubber plug is tapered such that the outer periphery of the mounting tube portion gradually increases in diameter toward the front side, or the inner periphery of the mounting tube portion is on the front side. The taper is gradually reduced in diameter toward the end.
If the inner circumference of the mounting cylinder is tapered with the diameter gradually reduced toward the front side, the outer circumference becomes tapered with the diameter gradually enlarged toward the front side as the insulation coating of the wire is inserted. As a result, the high compression part is formed. When the insulation barrel is pressure-bonded to the tapered high-compression part whose outer periphery gradually expands toward the front side, including the case where it is formed in the same shape in advance, Under the force, the high compression part tends to extend forward.

(3) A concave portion is provided around the outer surface of the low compression portion in the mounting cylinder portion. When the low compression portion is further thinned and the insulation barrel is pressure-bonded, the amount of compression is further reduced, and the backward extension is further restricted.
(4) A C surface is formed at a corner on the front side of a surface of the terminal fitting that is in close contact with the outer periphery of the mounting tube portion of the rubber plug in the insulation barrel. Since the taper surface of the high compression portion is pressed by a taper surface which is a C surface provided at the edge of the insulation barrel, the high compression portion is more reliably released forward.
(5) The said electric wire is an aluminum electric wire provided with the core wire made from aluminum or aluminum alloy. This is particularly useful when an aluminum electric wire that tends to jump out rearward of the rubber plug is used.

  According to the present invention, the cavity can be reliably sealed with the rubber plug.

1 is a partially cutaway side view of a rubber plug and an electric wire according to Embodiment 1 of the present invention. Partially cutaway side view showing the operation of crimping the end of a wire and a rubber plug to a female terminal Sectional drawing which shows operation | movement which inserts a female terminal and a rubber stopper in the cavity of a female housing Partial enlarged sectional view showing the crimping operation of the insulation barrel Sectional drawing which shows the state in which the female terminal and the rubber plug were inserted into the cavity of the female housing The partial expanded sectional view which shows the crimping | compression-bonding operation | movement of the insulation barrel which concerns on Embodiment 2. FIG. Partially cutaway side view of rubber plug and electric wire according to Embodiment 3 Sectional view with the wires inserted Partial cutaway side view of rubber plug and electric wire according to Embodiment 4 Sectional view with the wires inserted

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
In this embodiment, a female terminal fitting 20 (hereinafter referred to as a female terminal 20) is connected to the end of the aluminum electric wire 10, and the female terminal 20 is inside the cavity 51 of the female connector housing 50 (hereinafter referred to as a female housing 50). A waterproof connector is illustrated in which the rear end of the cavity 51 is closed and sealed together with the rubber plug 30 together with the rubber plug.
As shown in FIG. 1, the aluminum electric wire 10 has a core wire 11 formed of a stranded wire formed by twisting a plurality of strands made of aluminum or an aluminum alloy, and an insulating coating 12 made of a synthetic resin surrounds the core wire 11. It has a covered structure.

The female terminal 20 is formed by, for example, pressing a copper alloy plate, and as shown in FIG. 2, a terminal having a substantially rectangular tube shape that is electrically connected to a mating male terminal (not shown). In this structure, a wire barrel 25 and an insulation barrel 26 are provided behind the connecting portion 21.
An elastic contact piece 23 is provided inside the terminal connection portion 21 so as to be folded back from the front edge of the bottom plate 22, and the above-mentioned tab of the mating male terminal is inserted into the terminal connection portion 21 from the front. The male terminal and the female terminal 20 are electrically connected by elastically contacting the elastic contact piece 23. A lance hole 24 is formed in the bottom surface of the terminal connection portion 21.

  The wire barrel 25 is an open barrel type, and a pair of left and right wide barrel pieces 25 </ b> A are formed to rise from the left and right side edges of the bottom plate 22. The wire barrel 25 is caulked and crimped to the end of the core wire 11 of the aluminum electric wire 10 described above, and both barrel pieces 25A hold the outer ends of the ends of the core wire 11 from both the left and right sides while abutting the protruding ends. In other words, it can be caulked into a so-called heart shape.

The insulation barrel 26 is also of an open barrel type, and a pair of left and right barrel pieces 26A that are narrower and taller than the barrel pieces 25A on the wire barrel 25 side are similarly connected to each other from the left and right side edges of the bottom plate 22. It is formed so as to face each other.
On the other hand, a rubber plug 30 to be described later is fitted to the end of the insulating coating 12 where the aluminum electric wire 10 is left, and the above-described insulation barrel 26 is attached to the terminal of the insulating coating 12 and the mounting tube portion 40 of the rubber plug 30. It is caulked and crimped over. The insulation barrel 26 can be caulked into a so-called overlap type, for example, by embedding the outer periphery of the mounting tube portion 40 of the rubber plug 30 from both the left and right sides while the two barrel pieces 26A overlap each other. ing.

The rubber plug 30 is made of oil-impregnated silicon or the like and is formed in a cylindrical shape that is long in the front-rear direction as shown in FIG. The insulating coating 12 of the aluminum electric wire 10 is inserted into the inner peripheral side of the rubber plug 30, that is, in the center hole 31.
The rubber plug 30 has a main region 32 having a large diameter (thick wall) in the length region of about 2/3 on the rear side, and the remaining length region on the front side has the female terminal 20 as described above. This is an attachment tube portion 40 to which the insulation barrel 26 is caulked.

The outer lip 34 that elastically adheres to the inner peripheral surface of the cavity 51 formed in the female housing 50 is provided on the outer peripheral surface of the main body portion 32 of the rubber plug 30, specifically, the outer peripheral surface of the front half portion of the main body portion 32. Is protruding. The outer lip 34 has a mountain shape in cross section and is formed in an annular shape over the entire circumference, and is formed in two strips at intervals in the front and rear direction.
The center hole 31 of the rubber plug 30 has a diameter through which the insulating coating 12 of the aluminum electric wire 10 is inserted almost tightly in the mounting cylinder portion 40, and is smaller in the latter half portion of the main body portion 32, and between them. In the position, two inner lips 35 shown in the figure are formed at intervals in the front-rear direction.

As shown in FIG. 3, the female housing 50 is formed with a cavity 51 in which the female terminal 20 connected to the terminal of the aluminum electric wire 10 can be inserted from the rear. The front wall 52 of the cavity 51 has a terminal insertion port 53 into which a tab of a mating male terminal is inserted, and a lance 54 that can be elastically displaced is provided on the front bottom wall.
In addition, a seal portion 55 having a circular cross section is formed on the rear side of the cavity 51 over a region that is a little less than half the entire length. Specifically, the seal portion 55 is configured by an equal-diameter portion 56 having an inner diameter smaller than the outer diameter of the outer lip 34 of the rubber plug 30 by a predetermined dimension. In addition, a guide portion 57 for guiding that tapers toward the opening edge is formed at the rear end of the seal portion 55 in a form connected to the equal-diameter portion 56.

Now, the attachment tube portion 40 of the rubber plug 30 will be further described. As described above, the insulation barrel 26 of the female terminal 20 is caulked on the mounting cylinder portion 40, and as shown in FIG. 4, a flange 41 for retaining is formed at the tip portion. Yes. A rear region of the flange 41 in the mounting cylinder portion 40 is a region 42 (hereinafter, referred to as a caulking portion 42) in which the insulation barrel 26 can be caulked, and is a length slightly less than twice the width of the barrel piece 26A of the insulation barrel 26. Have
The caulking portion 42 in the mounting cylinder portion 40 is divided into a front half portion and a rear half portion with a substantially central portion in the length direction sandwiched between them, and the rear half portion has a constant outer diameter, whereas the front half portion is The boundary with the second half is the same outer diameter as the second half, and the diameter gradually increases from there toward the front.
In other words, the front half is formed in a tapered shape that gradually increases in thickness toward the front, forming a high compression portion 43, and the rear half is a relatively constant thin low compression portion 44.

The operation of this embodiment will be described. The procedure for crimping the female terminal 20 and the rubber plug 30 to the end of the aluminum electric wire 10 is as follows.
As shown in FIG. 1, the rubber plug 30 is passed through the end of the aluminum wire 10, and the end of the insulating coating 12 of the aluminum wire 10 is peeled in a state where the rubber plug 30 is once retracted backward (same as above). The part of the core wire 11 is exposed over a predetermined length. After that, as shown in FIG. 2, the rubber plug 30 is moved forward, and is fitted into the outer periphery of the terminal of the insulating coating 12 where the mounting cylinder part 40 is left.

  Then, the female terminal 20 and the rubber plug 30 are crimped and connected to the end of the aluminum electric wire 10 using a crimping device. Specifically, the crimping device is provided with an anvil and a crimper, and the exposed end of the core wire 11 with respect to the wire barrel 25 of the female terminal 20 and the remaining insulation coating with respect to the insulation barrel 26. The twelve terminals and the mounting cylinder portion 40 of the rubber plug 30 fitted thereto are set in a state where they are arranged, and both the barrels 25 and 26 are crimped between the anvil and the crimper. As a result, the female terminal 20 is fixed to the end of the aluminum electric wire 10 by pressing together with the rubber plug 30.

  Here, the aluminum electric wire 10 has a situation that an oxide film is likely to be formed on the surface of the core wire 11 when outside air comes into contact with it. In order to peel off the oxide film, the wire barrel 25 is highly compressed in the crimping process. It is crimped, that is, crimped. As a result, the contact resistance between the core wire 11 and the wire barrel 25 can be reduced. On the other hand, the crimped portion of the wire barrel 25 extends in the axial direction, and the entire length of the female terminal 20 is extended. Unavoidable.

  In addition to the above, there are the following circumstances when the rubber plug 30 is crimped together with the end of the insulating coating 12 by the insulation barrel 26. That is, before the above-described crimping operation, when the rubber plug 30 is moved forward and fitted to the end of the insulating coating 12, it is quite difficult to accurately position the mounting tube portion 40. Therefore, this embodiment Then, as shown in FIG. 4, the caulking portion 42 of the mounting cylinder portion 40 is formed long with a margin in the axial direction, and the mounting position of the rubber plug 30 is slightly deviated from the mounting cylinder portion 40. Thus, the insulation barrel 26 can be securely crimped.

Here, when the fitting position of the rubber plug 30 is shifted backward, the insulation barrel 26 is located at the same position corresponding to the front end side of the caulking portion 42 of the mounting cylinder portion 40 as shown by a chain line in FIG. It will be crimped to. When crimped in this way, the entire rubber plug 30 is shifted to the rear of the female terminal 20.
Further, when the insulation barrel 26 is pressure-bonded to the mounting cylinder part 40, the mounting cylinder part 40 is elongated in the axial direction. However, the caulking part 42 of the mounting cylinder part 40 has the same thickness over the entire length. When the crimping is performed on the front end side of the caulking portion 42 as described above, the attachment tube portion 40 mainly extends rearward, and the rubber plug 30 is pushed further rearward. As the insulation barrel 26 is compressed with a high load in order to secure a high holding force, the elongation increases.

  In this regard, in this embodiment, the front half portion of the caulking portion 42 of the mounting tube portion 40 of the rubber plug 30 is formed as a high compression portion 43 having a tapered shape that gradually becomes thicker toward the front. When the barrel 26 is crimped to the front side of the caulking portion 42 of the mounting cylinder portion 40, it is inevitable that the position of the entire rubber plug 30 is shifted to the rear of the female terminal 20 to some extent. As for the high compression part 43 on the front side, the rubber plug 30 tends to escape forward by being mainly compressed, and extends almost only forward by receiving the component force of the crimping force acting on the tapered surface 43A. It is restricted to be pushed backwards.

The female terminals 20 and the rubber plugs 30 fixed to the ends of the aluminum electric wires 10 as described above are inserted from the rear into the corresponding cavities 51 of the female housing 50 as shown by the arrows in FIG. As shown in the figure, when the lens is inserted to the normal position, it is retained by the lance 54.
As described above, because the rubber plug 30 can be restricted to the extent that the mounting cylinder portion 40 can be ignored when the insulation barrel 26 is crimped, the rubber plug 30 can be regulated at the seal portion 55 of the cavity 51 of the female housing 50. With respect to the diameter portion 56, the rubber plug 30 only needs to have a length so as to absorb the rearward displacement of the rubber plug 30 caused by the elongation of the wire barrel 25 and the pressure-bonding position of the insulation barrel 26 with respect to the mounting cylinder portion 40. The two outer lips 34 including the rear side are held at positions where they enter the equal-diameter portion 56 in the seal portion 55 of the cavity 51. As a result, both the outer lips 34 can be in close contact with the inner peripheral surface of the cavity 51 with a sufficient amount of compression, and as a result, the seal between the aluminum electric wire 10 and the cavity 51 can be reliably taken.
In short, it is possible to reliably perform the sealing function by the rubber plug 30 while suppressing the enlargement of the female housing 50 as much as possible.

<Embodiment 2>
FIG. 6 shows Embodiment 2 of the present invention. In the second embodiment, a barrel piece 26 </ b> A that is stacked on the lower side of the insulation barrel 26 of the female terminal 20, that is, a barrel piece 26 </ b> A that is in close contact with the caulking portion 42 of the mounting tube portion 40 of the rubber plug 30, A C surface 28 is formed at the front corner.
Other structures including the shape of the rubber plug 30 are the same as those in the first embodiment.

  According to the second embodiment, when the insulation barrel 26 is pressure-bonded to the mounting tube portion 40 of the rubber plug 30, the tapered surface 43A of the high compression portion 43 is the C surface 28 provided at the edge of the barrel piece 26A. Since it is pressed by a taper surface having a certain large area, the high compression portion 43 is more reliably released forward, that is, extended. Occurrence of a situation where the rubber plug 30 is pushed backward due to the extension of the mounting cylinder portion 40 is more reliably regulated.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIGS.
In the third embodiment, the caulking portion 62 of the mounting tube portion 60 of the rubber plug 30A is contrived with a shape on the inner peripheral side, contrary to the first embodiment. That is, as shown in FIG. 7, on the inner peripheral surface of the caulking portion 62 of the mounting cylinder portion 60, the inner diameter is constant in the latter half portion sandwiching the substantially central portion in the length direction, whereas the first half portion is the latter half portion. The boundary with the part has the same inner diameter as that of the latter half part, and the diameter is gradually reduced from there toward the front. In other words, a tapered portion 63 that gradually increases in thickness toward the front is formed on the inner surface of the front half of the caulking portion 62.
About another structure, it is the same as that of the rubber plug 30 illustrated in Embodiment 1, and the overlapping description is abbreviate | omitted by attaching | subjecting the same code | symbol about the part and site | part which have the same function.

In the rubber plug 30 </ b> A of the third embodiment, as shown in FIG. 8, as the end of the insulating coating 12 of the electric wire 10 is tightly inserted into the mounting cylinder 60, The taper-shaped portion 63 protruding to the outside is pushed outward, and the outer periphery gradually increases in diameter toward the front side and rises, and as in the first embodiment, the first half of the caulking portion 62 of the mounting cylinder portion 60 The portion is substantially formed with a high compression portion 43 having a tapered shape gradually becoming thicker toward the front.
As a result, as in the first embodiment, even when the insulation barrel 26 is crimped to the caulking portion 62 of the mounting tube portion 60, particularly the front side thereof, the front high compression portion 43 is mainly compressed, so that In addition, by receiving a component of the pressure-bonding force acting on the taper surface 43A, the rubber plug 30A is restricted from being pushed back and pushed backward.

<Embodiment 4>
9 and 10 show Embodiment 4 of the present invention. In the rubber plug 30B of the fourth embodiment, a plurality of concave portions 65 are formed on the outer peripheral surface of the rear half portion, which is the low compression portion 44 in the caulking portion 62B of the mounting cylinder portion 60, with respect to the rubber plug 30A of the third embodiment. Are formed over the entire circumference with an angular interval of.
According to this rubber plug 30B, the amount of compression when the insulation barrel 26 is pressure-bonded to the low compression portion 44 is further reduced by further reducing the thickness of the low compression portion 44 in the caulking portion 62B of the mounting cylinder portion 60. Thus, the rearward escape, that is, the rearward extension is further restricted.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the said embodiment, although the high compression part and low compression part which are provided in the attachment cylinder part of a rubber plug were formed in the length of about half each, the ratio of the length can be set arbitrarily .
(2) In the above embodiment, the high compression portion is formed in a tapered shape. However, the high compression portion is formed to have a thicker diameter than the low compression portion, and a step is formed between the high compression portion and the low compression portion. It may be provided in a shape.

(3) When the rubber plug illustrated in the third and fourth embodiments is used, the C-surface is formed on the back corner of the barrel piece that is in close contact with the caulking portion of the mounting portion of the rubber plug in the insulation barrel. Similarly, the high compression portion can be more reliably released forward.
(4) As a form in which the concave portion is provided in the low compression portion of the mounting cylinder portion illustrated in the fourth embodiment, a circumferential groove over the entire circumference may be formed.
(5) Also in the rubber plug of the first embodiment, a recess may be provided in the low compression portion.

(6) The present invention is also applicable to the case where a rubber plug is crimped to the male terminal together with the end of the electric wire.
(7) When the insulation barrel is pressure-bonded to the attachment tube portion of the rubber plug, the situation in which the attachment tube portion is stretched is also the case where the rubber plug is fitted to a copper electric wire having a copper or copper alloy core wire. Since it is the same, this invention is applicable also when using a copper electric wire as an electric wire, and can obtain an effect.

10 ... Aluminum wire (wire)
DESCRIPTION OF SYMBOLS 11 ... Core wire 12 ... Covered electric wire 20 ... Female terminal (terminal metal fitting)
25 ... Wire barrel 26 ... Insulation barrel 26A ... Barrel piece 28 ... C side 30,30A, 30B ... Rubber stopper 34 ... Outer lip (lip)
40 ... Installation cylinder part 42 ... Caulking part 43 ... High compression part 43A ... Tapered surface 44 ... Low compression part 50 ... Female housing (connector housing)
51 ... Cavity 60 ... Mounting cylinder part 62, 62B ... Caulking part 65 ... Concave part

Claims (9)

A lip that is fixed to the end of the electric wire together with the terminal fitting, and is fitted to the rear end of the cavity as the terminal fitting is inserted into the cavity of the connector housing, and is provided on the outer peripheral surface of the cavity. A rubber plug that elastically adheres and seals to the surface,
The rubber plug is provided with a mounting cylinder portion fitted on the end of the insulation coating of the electric wire, and the insulation barrel provided on the terminal fitting is crimped together with the end of the insulation coating . The rubber plug is characterized in that the portion crimped to the insulation barrel is formed in a form that is divided into a high compression portion and a low compression portion in the axial direction, and the high compression portion is arranged on the front side. The rubber plug according to claim 1, wherein the high compression portion of the mounting tube portion is formed by expanding an outer periphery of the mounting tube portion or reducing an inner periphery thereof. The high compression portion is formed in a tapered shape in which the outer periphery gradually increases in diameter toward the front side, or in a tapered shape in which the inner periphery gradually decreases in diameter toward the front side. Rubber stopper. The rubber plug according to any one of claims 1 to 3, wherein a concave portion is provided around an outer surface of the low compression portion in the mounting cylinder portion. A wire barrel of a terminal fitting is crimped to the end of the core wire in an electric wire in which a metal core wire is covered with an insulation coating, and a rubber plug having a lip around the outer peripheral surface is fitted to the end of the insulation coating. Insulation barrels of the terminal fittings are crimped to the mounting tube portion provided on the rubber plug and the end of the insulation coating, and the terminal fittings are inserted into cavities provided in the connector housing. In connection with the waterproof connector, the rubber plug is fitted to the rear end of the cavity, and the lip is sealed by elastically contacting the inner peripheral surface of the cavity.
The portion of the mounting tube portion of the rubber plug that is caulked to the insulation barrel is formed to be divided into a high compression portion and a low compression portion in the axial direction, and the high compression portion is disposed on the front side. Waterproof connector featuring. 6. The waterproofing according to claim 5, wherein the high compression portion of the mounting tube portion in the rubber plug is formed by expanding the outer periphery of the mounting tube portion or reducing the inner periphery thereof. connector. The high compression portion of the mounting tube portion of the rubber plug is formed into a tapered shape in which the outer periphery of the mounting tube portion gradually expands toward the front side, or the inner periphery of the mounting tube portion gradually toward the front side. The waterproof connector according to claim 6, wherein the waterproof connector is formed in a tapered shape with a reduced diameter. The C surface is formed in the corner | angular part of the front side of the surface closely_contact | adhered to the outer periphery of the said attachment cylinder part of the said rubber plug in the said insulation barrel of the said terminal metal fitting. The waterproof connector according to any one of 7. The waterproof connector according to any one of claims 5 to 8, wherein the electric wire is an aluminum electric wire provided with a core wire made of aluminum or an aluminum alloy.

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