JPH07245149A - Waterproofing rubber plug - Google Patents

Abstract

PURPOSE:To enhance the waterproofing of a rubber plug by furnishing an elongating/contracting deformation part between a fastening connection part and the tail, and thereby absorbing dispersion of the position of the waterproof rubber plug despite dispersing position of the fastening connection to the termination of an electric wire concerned. CONSTITUTION:A waterproof rubber plug 25 is fitted with a lid 49 contacting the peripheral edge 47 of an opening 45 on the wire drawout side of a terminal accommodation chamber 31, and an elongating/contracting deformation part 43 is furnished between a fastening connection part 33 and a seal part 35. The deformation part 43 is made thinner than the seal part 35 and formed with a smaller wall thickness than the same 35. In the condition that the plug 25 is formed, the part swells outward and is possible to make elongation and contraction in the axial direction of an electric wire 27 and also capable of deforming in the direction across the wire axial direction. Accordingly a dislocation of the plug 25 is absorbed by contraction of the deformation part 43, so that the plug positions relative to the parts 35 and 49 are free from risk of changing, and also there is no risk of the plug tail intruding into the chamber 31, which should lead to enhancement of the waterproofing performance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof rubber stopper which is caulked and connected to a terminal of an electric wire together with a terminal fitting to waterproof the terminal accommodating chamber.

[0002]

2. Description of the Related Art FIG. 7 shows a waterproof rubber plug 1 described in Japanese Utility Model Laid-Open No. 62-163879. This waterproof rubber stopper 1
Is integrally formed of soft synthetic rubber, and is crimped and connected to the end of the electric wire 3 together with the crimping portion 7 of the terminal 5, and the inner wall of the terminal accommodating chamber 11 in which the terminal 5 is accommodated. And a seal portion 13 that comes into close contact with 11a,
The electric wire 3 is inserted in the inside along the axial direction in a close contact state.

The caulking connection portion 9 is sandwiched between the caulking portion 7 of the terminal 5 and the outer circumference of the electric wire 3, whereby the waterproof rubber plug 1 is fixed to the electric wire 3. The seal portion 13 is provided with annular lip portions 15 and 15 protruding from the outer peripheral surface, and when inserted into the terminal accommodation chamber 11, the terminal accommodation chamber 11
The inner wall 11a of the terminal 3 is closely contacted with the inner wall 11a to seal between the outer periphery of the electric wire 3 and the inner wall 11a of the terminal accommodating chamber 11.

In order to accommodate the terminal 5 of the wire end to which the waterproof rubber plug 1 is connected in the terminal accommodating chamber 11, the terminal 5 is inserted through the opening 17 at the rear end of the terminal accommodating chamber 11.
Further, the waterproof rubber plug 1 is pushed into the terminal accommodating chamber 11. The terminal 5 is accommodated in the terminal accommodating chamber 11 by engaging the terminal 5 with a flexible locking arm (not shown) protruding from the inner wall 11 a of the terminal accommodating chamber 11.

At this time, in the waterproof rubber plug 1 pushed into the terminal accommodating chamber 11 together with the terminal 5 from the opening 17 side, the lip portions 15 and 15 are in close contact with the inner wall 11a of the terminal accommodating chamber 11 and the electric wire Since 3 is inserted into the inner wall of the waterproof rubber stopper 1 in a close contact state, the waterproof rubber stopper 1 and the outer periphery of the electric wire 3 and the inner wall 11a of the terminal accommodating chamber 11 are sealed and the inside of the terminal accommodating chamber 11 is sealed. Is guaranteed to be waterproof.

[0006]

However, when pushing such a waterproof rubber plug 1 together with the terminal 5 into the terminal accommodating chamber 11, if it is pushed too far into the terminal accommodating chamber 11,
As shown in FIG. 7, the rear end portion 19 of the waterproof rubber plug 1 enters the terminal accommodating chamber 11 from the edge of the opening of the terminal accommodating chamber 11, and a step portion 21 is generated.

If the position of the caulking portion 7 of the terminal 5 with respect to the caulking connection portion 9 varies, the position of the waterproof rubber plug 1 in the terminal accommodating chamber 11 also varies, and the caulking connection portion 9 is sealed. If it is caulked on the side of the portion 13, the rear end portion 19 of the waterproof rubber plug may enter the terminal accommodating chamber 11 and the step portion 21 may be formed as described above.

When such a step portion 21 is formed, water is likely to accumulate in this portion, and the accumulated water enters between the waterproof rubber plug 1 and the inner wall 11a of the terminal accommodating chamber 11 due to heat or vibration, and the terminal There is a risk of leakage between the terminals and corrosion of the terminal 5. As a result, poor contact may occur.

Further, as shown in FIG. 8, when the caulking connection portion 9 is displaced in a direction intersecting the axial direction of the electric wire 3, the sealing portion 13 on the caulking connection portion 9 side is also offset. However, the inner wall 11a of the terminal accommodating chamber 11 cannot be uniformly brought into close contact with the inner wall 11a. Therefore, the sealing is performed only at the rear end portion of the seal portion 13, that is, at the side of the opening 17, so that there is a problem that the waterproof performance is deteriorated.

Therefore, the object of the present invention is to provide a waterproof rubber plug capable of improving the waterproof performance by absorbing the variation of the position of the waterproof rubber plug even if the caulking connection position to the electric wire terminal is varied. And

[0011]

In order to achieve the above object, in the invention according to claim 1, a crimping connection portion crimped and connected to a terminal of an electric wire together with a terminal fitting, and a terminal accommodating chamber accommodating the terminal fitting. A waterproof rubber plug having a seal portion that comes into close contact with the inner wall of the electric wire and through which the electric wire is inserted in the close state, and expands and contracts in the axial direction of the electric wire between the caulking connection portion and the rear end portion. It is characterized in that an expandable / contractible deformable portion which can be deformed in a direction intersecting the axial direction of the electric wire is provided.

According to the second aspect of the present invention, there is provided a caulking connection portion which is caulked and connected to the end of the electric wire together with the terminal fitting, and a seal portion which comes into close contact with the inner wall of the terminal accommodating chamber in which the terminal fitting is accommodated. A waterproof rubber plug having an electric wire inserted through the inside thereof is provided with a lid portion that comes into contact with a peripheral portion of an opening of the terminal accommodation chamber on the electric wire drawing side, and an electric wire is provided between the caulking connection portion and the lid portion. It is characterized in that an expansion / contraction deformable portion is provided which is expandable / contractible along the axial direction and is deformable in a direction intersecting the axial direction of the electric wire.

According to a third aspect of the present invention, the invention according to the first and second aspects is characterized in that the elastic deformation portion is formed between the caulking connection portion and the seal portion.

According to a fourth aspect of the present invention, there is provided the invention according to the first and second aspects, wherein the expansion / contraction deformation portion is provided in the seal portion, and between the plurality of lip portions that come into close contact with the inner wall of the terminal accommodating chamber. It is characterized by being formed.

According to a fifth aspect of the present invention, the invention according to the second aspect is characterized in that the elastic deformation portion is formed between the seal portion and the lid portion.

According to the invention described in claim 6,
The invention according to 3, 4, and 5 is characterized in that the elastic deformation portion is formed in a thin portion thinner than the thickness of the seal portion.

According to the invention of claim 7, claims 1, 2 and
The invention described in 3, 4, and 5 is characterized in that the elastic deformation portion is formed in a bellows shape.

According to the invention described in claim 8, claims 2, 3,
In the inventions described in paragraphs 4 and 5, the lid portion has a flange portion having a diameter larger than the inner diameter of the opening of the terminal accommodation chamber on the wire drawing side, and abutting on the peripheral edge portion of the opening, the outer periphery of the inserted electric wire and the terminal accommodation chamber. It is characterized in that it comprises an electric wire insertion portion that abuts in a close contact state outside the opening on the electric wire drawing side.

[0019]

According to the first aspect of the present invention, by pushing the waterproof rubber plug together with the terminal into the terminal accommodating chamber, the seal portion is brought into close contact with the inner wall of the terminal accommodating chamber to waterproof the terminal accommodating chamber. When the caulking connection position of the waterproof rubber plug to the wire end is on the seal side, the waterproof rubber plug is displaced to the inner side of the terminal accommodating chamber, but this displacement is absorbed by the expansion and contraction deformation portion. Further, when the crimping connection position of the waterproof rubber plug to the wire end is on the tip end side of the crimping connection part, the waterproof rubber plug is displaced to the outside of the terminal accommodating chamber, but the expansion and contraction deformation part contracts, The gap is absorbed. Further, even when the caulking connection portion is displaced in the direction intersecting the axial direction of the electric wire, the displacement is absorbed by the expansion / contraction deformation portion being deformed in this direction. Therefore, even if the position of the caulking connection portion is displaced, the displacement of the waterproof rubber plug is absorbed by the expansion / contraction deformation portion, so that the rear end portion does not enter the terminal accommodating chamber and the step portion does not occur.

According to the second aspect of the present invention, the waterproof rubber stopper is pushed into the terminal accommodating chamber together with the terminal, so that the seal portion comes into contact with the inner wall of the terminal accommodating chamber in a close contact state and at the wire drawing side of the terminal accommodating chamber. The lid contacts the peripheral edge of the opening.
As a result, the terminal accommodating chamber is waterproofed. In this case, the rear end of the waterproof rubber plug is not pushed into the inner part of the terminal accommodating chamber by the contact of the lid with the peripheral edge of the electric wire outlet side opening of the terminal accommodating chamber. Further, even if there is a variation in the axial position where the terminals are caulked together with the terminal, the expansion / contraction deformation part expands / contracts in the axial direction to absorb the displacement of the waterproof rubber plug. Further, even if the caulking connection position is displaced in the direction intersecting the axial direction of the electric wire, the displacement of the waterproof rubber plug is absorbed by the deformation of the elastic deformation portion.

According to the third aspect of the invention, even if there is a variation in the axial position where the terminals are crimped together with the terminal, the expansion / contraction deformation part expands / contracts in the axial direction of the electric wire or intersects with the axial direction. The deformation of the waterproof rubber plug is absorbed by the deformation. In this case, since the expansion / contraction deformation part is formed between the caulking connection part and the seal part, even if the position of the caulking connection part is displaced, only the caulking connection part is displaced, and the sealing part,
The lid will not shift.

According to the fourth aspect of the invention, even if there is a variation in the axial position where the terminals are crimped together, the elastic deformation portion expands or contracts in the axial direction of the electric wire or intersects the axial direction. The deformation of the waterproof rubber plug is absorbed by the deformation in the direction. In this case, since the elastic deformation portion is formed between the lip portions of the seal portion, the lip portion on the caulking connection portion side and the caulking connection portion may be displaced, and the lip portion on the lid portion side and the lid portion may shift. Absent.

According to the fifth aspect of the present invention, even if there is a variation in the axial position where the terminals are caulked together, the expansion / contraction deformation part expands / contracts in the axial direction of the electric wire or intersects with the axial direction. The deformation of the waterproof rubber plug is absorbed by the deformation. In this case, since the expansion / contraction deformation portion is formed between the seal portion and the lid portion, the caulking connection portion and the seal portion do not shift and the lid portion does not shift.

According to the sixth aspect of the present invention, even if there is a variation in the position where the terminals are caulked and connected, the displacement of the waterproof rubber plug is absorbed by the expansion and contraction of the thin portion. Thereby, for example, the electric wire is not drawn into the terminal accommodating chamber, and a step portion is not formed between the waterproof rubber plug and the peripheral edge of the electric wire drawing side opening of the terminal accommodating chamber.

According to the seventh aspect of the present invention, even if there is a variation in the position where the terminals are caulked and connected, the displacement of the waterproof rubber plug is absorbed by the expansion and contraction of the bellows portion. Thereby, for example, the electric wire is not drawn into the terminal accommodating chamber, and a step portion is not formed between the waterproof rubber plug and the peripheral portion of the opening on the electric wire drawing side.

According to the invention of claim 8, when the waterproof rubber stopper is pushed into the terminal accommodating chamber together with the terminal, the collar portion abuts on the peripheral edge portion of the opening of the terminal accommodating chamber, whereby the rear end portion of the waterproof rubber stopper. Does not enter the terminal accommodating chamber, and no step is formed between the peripheral edge of the opening of the terminal accommodating chamber and the rear end of the waterproof rubber plug. Further, the electric wire inserted through the waterproof rubber plug comes into close contact with the electric wire insertion portion outside the electric wire pull-out side opening of the terminal accommodating chamber.

[0027]

Embodiments of the waterproof rubber stopper according to the present invention will be described below with reference to the drawings. FIG. 1A is a perspective view showing a waterproof rubber plug 25 of the embodiment and a terminal fitting 29 to which the waterproof rubber plug 25 is caulked and connected to an end of an electric wire 27,
(B) is a cross-sectional view showing the waterproof rubber plug 25 attached to the rear end portion of the terminal accommodating chamber 31. 2 and 3 are cross-sectional views showing a waterproof rubber plug attached to the rear end of the terminal accommodating chamber 31.

As shown in FIGS. 1 to 3, the waterproof rubber plug 25 of the present embodiment accommodates the terminal fitting 29 and the crimping connection portion 33 to be caulked and connected to the terminal of the electric wire 27 together with the terminal fitting 29. And a seal portion 35 that abuts the inner wall 31a of the terminal accommodating chamber 31 in a close contact state.

The caulking connection portion 33 is formed in a tubular shape so as to be fitted tightly around the entire outer periphery of the electric wire 27, and the caulking portion 37 of the terminal fitting 29 is wound around the outer periphery. As a result, the caulking connection portion 33 is clamped between the outer peripheral surface of the electric wire 27 and the waterproof rubber plug 25 is attached to the end of the electric wire 27.

The seal portion 35 is provided on the outer peripheral surface thereof with the terminal accommodating chamber 31.
Annular lip portion 3 that comes into close contact with the inner wall 31a of the
9, 39, 39 are formed, and annular lip portions 39, 39, 39 that come into close contact with the outer peripheral portion of the electric wire 27 are also formed on the inner wall portion of the insertion hole 41 into which the electric wire 27 is inserted. Therefore, the seal portion 35 comes into close contact with the inner wall 31a of the terminal accommodating chamber 31 and also comes into close contact with the electric wire 27 to thereby seal between the outer periphery of the electric wire 27 and the inner wall 31a of the terminal accommodating chamber 31. It is supposed to do.

Further, the waterproof rubber plug 25 of the present embodiment is provided with a lid 49 that abuts on the peripheral edge portion 47 of the opening 45 on the wire lead-out side of the terminal accommodating chamber 31, so that the caulking connection portion 33 and the sealing portion 35 are connected. A stretchable deformation portion 43 is provided between them.

The lid 49 comprises a flange portion 51 having a diameter larger than the inner diameter of the opening 45 on the wire drawing side of the terminal accommodating chamber 31, and an insertion portion 53 into which the electric wire 27 is inserted in a close contact manner. Tsubabe 51
When the waterproof rubber plug 25 is attached to the terminal accommodating chamber 31, it comes into contact with the peripheral edge portion 47 of the opening 45 on the wire drawing side.
The insertion portion 53 has an opening 4 when the flange portion 51 abuts on the peripheral edge portion 47.
The outer side of the wire 5 is in close contact with the outer circumference of the wire 27.

The elastic deformation portion 43 is formed thinner than the seal portion 35, and its thickness dimension L1 (see FIG. 2) is
It is set to be thinner than the thickness L2 of the seal portion 35. When the waterproof rubber plug 25 is molded, the waterproof rubber plug 25 bulges outward, is expandable and contractable along the axial direction of the electric wire 27, and is deformable in a direction intersecting the axial direction of the electric wire 27.

To mount such a waterproof plug 25 in the terminal accommodating chamber 31, the terminal fitting 29 is crimped to the end of the electric wire 27 together with the terminal fitting 29, and the terminal fitting 29 is attached.
The terminal fitting 29 is housed in the terminal housing chamber 31 by inserting the flexible fitting arm 55 provided in the terminal housing chamber 31 into the locking hole 57 of the terminal fitting 29. In this state, the lip portions 39, 39, 39 of the seal portion 35 come into close contact with the inner wall of the terminal accommodating chamber 31 and the electric wire 27
Is inserted into the insertion portion 53 in a close contact state,
The inside of the terminal accommodating chamber 31 is waterproof.

At this time, the caulking connection portion 33 and the seal portion 35 of the waterproof rubber plug 25 are also pushed into the terminal accommodating chamber 31, but the flange portion 51 of the lid 49 causes the lead-out side of the terminal accommodating chamber 31. The rear end portion of the waterproof rubber stopper 25 does not enter the terminal accommodating chamber 31 because the rear end portion of the waterproof rubber stopper 25 comes into contact with the peripheral edge portion 47 of the opening 45.

When the position of the caulking connection portion 33 to the wire end is varied, for example, as shown in FIG.
When the caulking connection portion 33 is caulked on the distal end side, the expansion and contraction deforming portion 43 contracts along the axial direction of the electric wire 27, whereby only the position of the caulking connection portion 33 is displaced and the sealing portion 3 is formed.
5. The lid 49 is not displaced. That is, the contraction of the elastic deformation portion 43 absorbs the displacement of the waterproof rubber plug 25. As a result, the positions of the seal portion 35 and the lid portion 49 of the waterproof rubber stopper 25 do not shift, and the rear end portion of the waterproof stopper 25 does not enter the terminal accommodating chamber 31.

The caulking portion of the wire end is the seal portion 3.
When the caulking is performed on the fifth side, the caulking connection portion 33 is located on the inner side of the terminal accommodating chamber 31, and the sealing portion 35 is formed.
Is pulled to the inner side of the terminal accommodating chamber 31, but the expansion and contraction deforming portion 43 extends so that the seal portion 35 and the lid 49 are not displaced to the inner side of the terminal accommodating chamber 31. That is, the elastic deformation portion 43 absorbs the displacement of the waterproof rubber plug 25. As a result, the seal portion 35 of the waterproof rubber plug 25 and the lid portion 49 are not displaced from each other, so that the periphery of the opening 45 on the wire lead-out side of the terminal accommodating chamber 31 and the rear end portion of the waterproof rubber plug 25 are prevented. There is no stepped part on the surface, and water does not collect.

Further, as shown in FIG. 4, even if the caulking connection portion 33 is displaced in the direction intersecting the axial direction, the expansion / contraction deforming portion 43 is deformed in the direction intersecting the axial direction. Therefore, the seal portion 35 and the lid portion 49 do not shift in the direction intersecting the axial direction.

Therefore, in the waterproof rubber plug 25 of the present embodiment, even if the caulking connection position of the wire end has a variation, the expansion / contraction deformation portion 43 can absorb the variation and improve the waterproof performance. I can.

Further, according to this embodiment, the caulking connection portion 3
Since the seal portion 35 and the lid portion 49 are not displaced only by the displacement of 3, the sealing performance is not deteriorated.

Further, by providing the lid portion 49, a step portion does not occur and water does not collect. Therefore, the waterproof performance can be improved.

Although the lid portion 49 is provided at the rear end portion of the waterproof rubber plug 25 of this embodiment, only the elastic deformation portion 43 may be provided and the lid portion 49 may not be provided.

Next, another embodiment will be described. Figure 5
The waterproof rubber plug 59 shown in FIG.
It is formed between the three lip portions 65, 65.

The caulking position of the caulking connection portion 33 is the electric wire 27.
When the elastic deformation portion 61 expands and contracts in the axial direction, the caulking connection portion 33 and the lip portions 65, 65 on the caulking connection portion 33 side are displaced in the axial direction and the terminal is accommodated. It is attached to the chamber 31. When the caulking connection portion 33 is displaced in the direction intersecting the axial direction, the expansion / contraction deforming portion 61 is deformed in the direction intersecting the axial direction.

The waterproof rubber plug 59 shown in FIG. 5 also absorbs the variation in the position of the waterproof rubber plug, even if the caulking connection position to the electric wire terminal varies, like the waterproof rubber plug 25 of the above embodiment. The waterproof performance can be improved. In this waterproof rubber plug 59, the positions of the seal portion 63 and the lip portions 65, 65 on the caulking connection portion 33 side are not displaced, and the lid portion 49 and the lip portion 65 on the lid portion 49 side are not displaced.

In the waterproof rubber plug 67 shown in FIG. 6, a stretchable deformation portion 69 is formed between the seal portion 35 and the lid portion 49.

The caulking position of the caulking connection portion 33 is the electric wire 27.
In the case where the crimping connection portion 33 and the lip portions 39, 39 on the crimping connection portion 33 side are displaced in the axial direction by the expansion and contraction of the expansion and contraction deformable portion 61 in the axial direction, the terminals are accommodated. It is attached to the chamber 31. When the caulking connection portion 33 is displaced in the direction intersecting the axial direction, the expansion / contraction deforming portion 69 is deformed in the direction intersecting the axial direction.

Similarly to the waterproof rubber plug 25 of the above-mentioned embodiment, the waterproof rubber plug 67 shown in FIG. 6 also absorbs the variation in the position of the waterproof rubber plug even if the caulking connection position to the wire end varies. The waterproof performance can be improved.

In each of the above embodiments, the expansion / contraction deformation section 4 is used.
Although the thin portions 3, 61 and 69 are formed, the elastic deformation portions 43, 61 and 69 may be formed in a bellows shape.

[0050]

As described above, according to the invention of claim 1, it is possible to expand and contract along the axial direction of the electric wire between the caulking connection portion and the rear end portion, and to the axial direction of the electric wire. By providing the elastic deformation part that can be deformed in the intersecting direction, even if the caulking connection position to the wire end varies, the elastic deformation part can absorb the variation in the position of the waterproof rubber plug, and the waterproof performance Can be improved.

According to the second aspect of the present invention, a lid portion is provided which abuts on the peripheral edge portion of the opening of the terminal accommodating chamber on the wire lead-out side, and is provided between the caulking connection portion and the lid portion in the axial direction of the electric wire. By providing an elastic deformation part that can be expanded and contracted and can be deformed in a direction intersecting the axial direction of the wire, even if the caulking connection position to the wire end varies, the elastic deformation part It is possible to absorb the variation in the position of
When the lid contacts the peripheral edge of the opening, the waterproof rubber plug is prevented from being drawn into the terminal accommodating chamber. Therefore,
Since no step portion is formed between the rear end portion of the waterproof rubber plug and the peripheral edge portion of the opening of the terminal accommodating chamber, water does not collect. Therefore, the waterproof performance can be improved.

According to the third aspect of the present invention, the expansion / contraction deformation portion is formed between the caulking connection portion and the seal portion, so that the position of the caulking connection portion is in the axial direction of the electric wire or the axial direction of the electric wire. Even if they are displaced in the direction intersecting with each other, the expansion / contraction deformation part absorbs this displacement and only the caulking connection part moves, and the seal part and lid part do not move. Therefore, it is possible to ensure waterproofing without lowering the waterproof performance.

According to the fourth aspect of the present invention, since the expansion / contraction deformation portion is formed between the lip portions of the seal portion, the lip portion on the caulking connection portion side and the caulking connection portion move, and the lid portion on the lid portion side is moved. The lip and lid do not move. Therefore, it is possible to ensure waterproofing without lowering the waterproof performance.

According to the fifth aspect of the invention, since the expansion / contraction deformation portion is formed between the seal portion and the lid portion, the caulking connection portion intersects the axial direction of the electric wire or the axial direction of the electric wire. Even if the cover portion is displaced in the direction of movement, the expansion / contraction deformation portion does not absorb the displacement and the lid portion does not move. Therefore, since no step portion is formed between the rear end portion of the waterproof rubber plug and the peripheral edge portion of the opening, water does not collect and reliable waterproofing can be achieved.

According to the sixth aspect of the present invention, even if there is a variation in the position where the terminals are caulked and connected, the thin portion expands and contracts to absorb the displacement of the waterproof rubber plug. Therefore, the electric wire is not drawn into the back of the terminal accommodating chamber, a gap portion is not formed between the waterproof rubber plug and the electric wire, and the waterproof performance can be improved.

According to the seventh aspect of the invention, even if there is a variation in the position where the terminals are caulked and connected, the displacement of the waterproof rubber plug is absorbed by the expansion and contraction of the bellows portion. This prevents the electric wire from being drawn into the terminal accommodating chamber, and does not cause a gap between the waterproof rubber plug and the electric wire. Therefore, the waterproof performance can be improved.

According to the invention of claim 8, when the waterproof rubber stopper is pushed into the terminal accommodating chamber together with the terminal, the collar portion abuts on the peripheral edge portion of the opening of the terminal accommodating chamber, whereby the rear end portion of the waterproof rubber stopper. Does not enter the terminal accommodating chamber, and no step is formed between the peripheral edge of the opening of the terminal accommodating chamber and the rear end of the waterproof rubber plug. Further, the electric wire inserted through the waterproof rubber plug comes into close contact with the electric wire insertion portion outside the electric wire pull-out side opening of the terminal accommodating chamber. Therefore, there is no gap or step between the waterproof rubber stopper and the electric wire, or between the rear end of the waterproof rubber stopper and the peripheral edge of the opening of the terminal accommodating chamber. , The waterproof performance can be improved.

[Brief description of drawings]

FIG. 1 shows an embodiment of a waterproof rubber stopper according to the present invention,
(A) is a perspective view showing a state where the end of the electric wire is swaged together with the terminal, and (b) is a cross-sectional view showing a state where the electric wire end is swaged together with the terminal and attached to the terminal housing.

FIG. 2 is a cross-sectional view showing a waterproof rubber stopper according to the present invention, showing a state in which a tip portion of a caulking connection portion is caulked and connected to an end of an electric wire.

FIG. 3 is a cross-sectional view showing a waterproof rubber stopper according to the present invention, showing a state in which the waterproof rubber plug is caulked and connected to an end of an electric wire through a sealing portion of a caulking connection portion.

FIG. 4 is a cross-sectional view showing a waterproof rubber stopper according to the present invention, showing a state in which a caulking connection portion moves in a direction intersecting an axial direction of an electric wire.

FIG. 5 is a cross-sectional view showing another embodiment of the waterproof rubber plug according to the present invention, in which an expansion / contraction deformation part is provided in the expansion / contraction deformation part and the seal part.

FIG. 6 is a cross-sectional view showing another embodiment of the waterproof rubber plug according to the present invention, in which an elastic deformation portion is provided between a seal portion and a lid portion.

FIG. 7 is a cross-sectional view showing a state where a conventional waterproof rubber plug is mounted in a terminal accommodating chamber.

FIG. 8 is a cross-sectional view showing a state in which a conventional rubber plug is mounted in a terminal accommodating chamber and a state in which a caulking connection portion is displaced in a direction intersecting the axial direction.

[Explanation of symbols]

 25, 59, 67 Waterproof rubber plug 27 Electric wire 29 Terminal fitting 31 Terminal accommodating chamber 31a Inner wall 33 Caulking connection part 35, 63 Seal part 43, 61, 69 Expansion / contraction deformation part 45 Opening 47 Peripheral part 49 Lid part 51 Collar part 53 Insertion Department

Claims (8)

[Claims] 1. An inside of an electric wire is provided with a caulking connection part which is caulked and connected to a terminal of an electric wire together with a terminal fitting, and a seal part which comes into close contact with an inner wall of a terminal accommodating chamber in which the terminal fitting is accommodated. In the waterproof rubber plug which is inserted in a close contact state, it is possible to expand and contract along the axial direction of the electric wire between the caulking connection portion and the rear end portion, and deformable in a direction intersecting the axial direction of the electric wire. A waterproof rubber stopper that is provided with a stretchable deformation part. 2. The inside of the electric wire is provided with a caulking connection portion which is caulked and connected to the end of the electric wire together with the terminal fitting, and a seal portion which comes into close contact with the inner wall of the terminal accommodating chamber in which the terminal fitting is accommodated. In a waterproof rubber plug that is inserted in a close contact state, a lid portion that comes into contact with the peripheral portion of the opening of the terminal housing chamber on the wire drawing side is provided, and an axial direction of the wire between the caulking connection portion and the lid portion. A waterproof rubber plug, which is provided with an expansion / contraction portion that can be expanded / contracted along a line and can be deformed in a direction intersecting an axial direction of an electric wire. 3. The waterproof rubber plug according to claim 1, wherein the elastic deformation portion is formed between the caulking connection portion and the seal portion. 4. The invention according to claim 1, wherein the elastic deformation portion is formed between a plurality of lip portions provided on the seal portion and abuttingly contacting an inner wall of the terminal accommodating chamber. Waterproof rubber stopper characterized by being 5. The waterproof rubber plug according to claim 2, wherein the elastically deformable portion is formed between the seal portion and the lid portion. 6. The waterproof rubber plug according to claim 1, 2, 3, 4, or 5, wherein the elastic deformation portion is formed in a thin portion thinner than the thickness of the seal portion. . 7. The waterproof rubber plug according to claim 1, 2, 3, 4, or 5, wherein the elastically deformable portion is formed in a bellows shape. 8. The collar according to claim 2, 3, 4, or 5, wherein the lid has a diameter larger than an inner diameter of an opening of the terminal accommodating chamber on a wire drawing side and is in contact with a peripheral edge of the opening. And a wire insertion portion that comes into close contact with the outer circumference of the inserted wire and the opening of the terminal housing chamber on the wire pull-out side.