JP2013152803A - Rubber plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve followability for bending of an electric wire while preventing insertion force into a cavity from increasing.SOLUTION: There is provided a rubber plug 20 that is inserted into a cavity 41 of a housing 40 from behind, the rubber plug including a crimp part 21 crimped to an electric wire W run through an electric wire insertion hole H with an insulation barrel 33 of terminal metal fittings 30, a front seal part 22 provided behind the crimp part 21 and coming into contact with an outer peripheral surface of the electric wire W and an inner peripheral surface of the cavity 41, and a rear seal part 23 provided behind the front seal part 22 and coming into contact with the outer peripheral surface of the electric wire W and the inner peripheral surface of the cavity 41. An outer peripheral lip 22B arranged on an outer peripheral side and an inner peripheral lip 22A arranged on an inner peripheral side are arranged at the same position in a front-rear direction at the front seal part 22, and an outer peripheral lip 23B arranged on an outer peripheral side and an inner peripheral lip 23A arranged on an inner peripheral side are arranged at positions shifting in the front-rear direction at the rear seal part 23.

Description

  The present invention relates to a rubber plug that is formed in a cylindrical shape in which a wire insertion hole through which an electric wire passes is provided so as to penetrate in the front-rear direction, and is inserted from the rear into a cavity of a housing.

  As this type of rubber plug, for example, a rubber plug described in Patent Document 1 below is known. The rubber plug includes a seal portion that is in close contact with the outer peripheral surface of the electric wire and the inner peripheral surface of the cavity of the housing, and a bending receiving portion that is formed behind the seal portion. This bending receiving portion is configured to increase in thickness toward the rear. When the electric wire drawn out behind the rubber plug is bent, the outer periphery taper surface of the bending receiving portion is received by the edge of the opening at the rear end of the cavity, so that the bending of the electric wire itself is regulated and the adhesion at the seal portion is maintained. Waterproofing is ensured.

Japanese Patent Laid-Open No. 10-247546

  However, in the rubber plug described above, it is necessary to perform the insertion work by pushing the bending receiving portion into the cavity, and the insertion force into the cavity increases as the latter half of the insertion process, and thus the insertion work becomes difficult.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to improve followability to bending of an electric wire while preventing an increase in insertion force into a cavity.

  The present invention is a rubber plug inserted into the cavity of the housing from the rear, with a wire insertion hole through which an electric wire is inserted penetrating in the front-rear direction, and the wire insertion hole by the barrel of the terminal fitting A crimping portion to be crimped to the electric wire passed through, a front seal portion provided behind the crimping portion and in close contact with the outer peripheral surface of the electric wire and the inner peripheral surface of the cavity, and an electric wire provided behind the front seal portion. The rear seal portion is in close contact with the outer peripheral surface of the cavity and the inner peripheral surface of the cavity. In the front seal portion, the outer peripheral lip disposed on the outer peripheral side and the inner peripheral lip disposed on the inner peripheral side are front and rear. In the rear seal portion, the outer peripheral lip disposed on the outer peripheral side and the inner peripheral lip disposed on the inner peripheral side are disposed at positions shifted in the front-rear direction. However, it has characteristics.

  According to such a configuration, at the front seal portion, the inner peripheral lip is pressed against the outer peripheral surface of the electric wire by the force received by the outer peripheral lip from the inner peripheral surface of the cavity, and the inner peripheral lip portion receives the force from the outer peripheral surface of the electric wire. By pressing the outer peripheral lip against the inner peripheral surface of the cavity, a high contact surface pressure can be secured. That is, the front seal portion is tightly sandwiched between the inner peripheral surface of the cavity and the outer peripheral surface of the electric wire, and the reliability of the sealing performance can be improved. On the other hand, in the rear seal portion, the force that the outer peripheral lip receives from the inner peripheral surface of the cavity is not transmitted to the inner peripheral lip, and the force that the inner peripheral lip receives from the outer peripheral surface of the electric wire is not transmitted to the outer peripheral lip. Contact surface pressure is not generated. Therefore, a frictional force generated between the outer peripheral lip and the inner peripheral surface of the cavity is reduced, and an increase in insertion force into the cavity can be prevented.

The following configuration is preferable as an embodiment of the present invention.
The protruding end of the outer peripheral lip of the rear seal portion has a larger dimension from the axial center of the wire insertion hole than the protruding end of the outer peripheral lip of the front seal portion, and the protruding end of the inner peripheral lip of the rear seal portion is It is good also as a structure where the dimension from the axial center of an electric wire penetration hole is smaller than the protrusion end of an inner peripheral lip.
According to such a configuration, when the electric wire is bent, the outer peripheral surface of the electric wire tends to be separated from the inner peripheral lip of the rear seal portion, but this inner peripheral lip is more than the inner peripheral lip of the front seal portion. Since it protrudes to the outer peripheral surface side of the electric wire, it is difficult to form a gap between the outer peripheral surface of the electric wire and the inner peripheral lip of the rear seal portion. Similarly, although the outer peripheral lip of the rear seal portion tends to be separated from the inner peripheral surface of the cavity, the outer peripheral lip protrudes closer to the inner peripheral surface of the cavity than the outer peripheral lip of the front seal portion. It is difficult to form a gap between the inner peripheral surface and the outer peripheral lip of the rear seal portion. Therefore, even when the electric wire is bent, it is difficult to form a gap inside and outside the rear seal portion, and the followability to the bending of the electric wire can be improved.

The dimension between the projecting end of the outer peripheral lip of the rear seal part and the inner peripheral surface of the outer peripheral lip is smaller than the dimension between the projecting end of the outer peripheral lip and the projecting end of the inner peripheral lip of the front seal part. The dimension between the protruding end of the inner peripheral lip of the seal part and the outer peripheral surface of the inner peripheral lip is equal to or smaller than the dimension between the protruding end of the outer peripheral lip of the front seal part and the protruding end of the inner peripheral lip. Also good.
According to such a structure, the thickness of the position passing through the outer peripheral lip of the rear seal portion can be made smaller than the thickness of the position passing through each lip of the front seal portion, and passes through the inner peripheral lip of the rear seal portion. The thickness of the position can be made equal to or less than the thickness of the position passing through each lip of the front seal portion. Therefore, the rear seal portion can be made more flexible than the front seal portion, and the followability to the bending of the electric wire can be further improved.

The outer peripheral lip and the inner peripheral lip of the rear seal portion may be arranged so as not to have overlapping regions in the front-rear direction.
According to such a configuration, the outer peripheral lip and the inner peripheral lip of the rear seal portion do not interfere with each other, and the frictional force generated between the outer peripheral lip and the inner peripheral surface of the cavity is further reduced. The increase in power can be prevented more.

The inner peripheral surface of the outer peripheral lip of the rear seal portion may be arranged at a position that does not contact the outer peripheral surface of the electric wire passed through the electric wire insertion hole.
According to such a configuration, when the electric wire is inserted into the electric wire insertion hole of the rubber plug, the inner peripheral surface of the rear seal portion and the outer peripheral surface of the electric wire do not contact each other, and no frictional force is generated between them. . That is, a gap is formed between the outer peripheral surface of the electric wire passed through the electric wire insertion hole and the inner peripheral surface of the outer peripheral lip of the rear seal portion. For this reason, when the rubber plug is inserted into the cavity, the outer peripheral lip of the rear seal portion is allowed to move from the inner peripheral surface of the cavity to the gap. Therefore, the frictional force generated between the outer peripheral lip of the rear seal part and the inner peripheral surface of the cavity can be further reduced.

The protruding end of the inner peripheral lip of the rear seal portion may be arranged behind the protruding end of the outer peripheral lip.
According to such a configuration, when the electric wire is bent, the inner peripheral lip that is easily affected by the bending is first arranged behind the outer peripheral lip, so that the followability to the bending of the electric wire can be further improved.

  ADVANTAGE OF THE INVENTION According to this invention, the followable | trackability with respect to the bending of an electric wire can be improved, preventing the increase in the insertion force to a cavity.

Sectional drawing which showed the internal structure of the connector provided with the rubber stopper in embodiment FIG. 1 is a cross-sectional view showing a state where a terminal fitting is in a half-inserted state in the connector of FIG. The principal part expanded sectional view which expanded and showed the rubber stopper vicinity in FIG. Sectional drawing which showed the state by which the electric wire was bent from the state of FIG. Sectional drawing which shows the state which cut | disconnected the rubber stopper along the shaft center Front view of rubber stopper Back view of rubber stopper

<Embodiment>
An embodiment of the present invention will be described with reference to the drawings of FIGS. In the present embodiment, the rubber plug 20 attached to the waterproof connector 10 is described as an example. As shown in FIG. 1, the waterproof connector 10 includes an electric wire W, a terminal fitting 30 connected to the end of the electric wire W, a housing 40 in which a cavity 41 for accommodating the terminal fitting 30 is formed, and a housing 40. The cover 50 is mounted, the short terminal 60 is connected to the terminal fitting 30, and the seal ring 70 is mounted on the cover 50. In this embodiment, the direction in which the terminal fitting 30 is inserted into and removed from the cavity 41 is the front-rear direction, and the left side in FIG. 1 is the front side.

  The terminal fitting 30 includes a rectangular tube-shaped connecting tube portion 31 to which the short terminal 60 is connected, a wire barrel 32 provided behind the connecting tube portion 31, and an insulation provided behind the wire barrel 32. A barrel 33 is provided. On the upper surface of the connecting tube portion 31, a locking step portion 34 is provided that protrudes upward.

  The wire barrel 32 is crimped to the core wire exposed by peeling off the insulation coating of the electric wire W. On the other hand, the insulation barrel 33 is pressure-bonded to the insulation coating of the electric wire W together with the rubber plug 20.

  The housing 40 is made of synthetic resin and has a hood portion 42 that opens forward. A short terminal 60 press-fitted and held inside the cover 50 can be inserted into the back wall 43 of the hood portion 42. The short terminal 60 passes through the back wall 43 of the hood portion 42 and is connected to the terminal fitting 30. Similarly, a hole for forming the lance 44 is formed in the back wall 43 of the hood portion 42, and a retainer 51 provided in the cover 50 can be inserted into the hole.

  The lance 44 is formed on the upper surface of the inner wall of the cavity 41, and has a cantilever shape that protrudes forward. The lance 44 prevents the terminal fitting 30 from coming off by coming into contact with the locking step portion 34 of the terminal fitting 30 from behind. Further, a retainer 51 is inserted into the bending space of the lance 44 from the front, and the terminal fitting 30 is prevented from coming off in a double-locked state by restricting the bending of the lance 44. When the terminal fitting 30 is in a half-inserted state with respect to the cavity 41, as shown in FIG. 2, the lance 44 remains pushed into the bending space by the locking step portion 34. The half insertion of the terminal fitting 30 is detected by abutting the tip of 44 and the tip of the retainer 51.

  As shown in FIG. 1, a seal ring mounting portion 52 to which a seal ring 70 is fitted is formed at the proximal end portion of the retainer 51. The seal ring mounting portion 52 is accommodated in a substantially rear half portion in the hood portion 42 together with the seal ring 70. Further, a seal ring pushing portion 53 for pushing the seal ring 70 from the front is formed at the base end portion of the seal ring mounting portion 52. The seal ring pushing portion 53 is fitted in a substantially front half portion in the hood portion 42.

  The rubber plug 20 is made of an elastic material such as silicone rubber, and has a substantially cylindrical shape in which an electric wire insertion hole H through which the electric wire W passes is provided in the front-rear direction, as shown in FIG. The rubber plug 20 is attached to the crimping portion 21 that is crimped to the insulation coating of the electric wire W by the insulation barrel 33, and is provided in contact with the outer peripheral surface of the electric wire W and the inner peripheral surface of the cavity 41. A front seal portion 22, a rear seal portion 23 provided continuously behind the front seal portion 22 and in close contact with the outer peripheral surface of the electric wire W, and a follower portion 24 provided continuously behind the rear seal portion 23. Are integrally provided. That is, the electric wire insertion hole H is configured by the internal space of the crimping portion 21, the internal space of the front seal portion 22, the internal space of the rear seal portion 23, and the internal space of the follower portion 24.

  The outer peripheral surface of the crimping portion 21 is inclined so as to approach the axis P of the wire insertion hole H as it goes forward. Further, the inner peripheral surface of the crimping portion 21 is configured to extend in the front-rear direction so as to be parallel to the axis P of the electric wire insertion hole H. A front end tapered surface 21 </ b> A is provided around the outer peripheral surface of the front end portion of the crimp portion 21. As shown in FIG. 3, the front end tapered surface 21 </ b> A is disposed in front of the insulation barrel 33, and the rubber that is caulked by the insulation barrel 33 and pushed forward in front of the insulation barrel 33 is radially outward. When the rubber plug 20 is inserted into the cavity 41, the frictional force is generated between the rubber plug 20 and the inner wall of the cavity 41 or the rubber plug 20 is turned over. doing. In addition, the thickness of the crimping | compression-bonding part 21 becomes small gradually, so that it goes to the front, and it becomes small rapidly by the front end taper surface 21A.

  The front seal portion 22 includes an inner peripheral lip 22A disposed on the inner peripheral side thereof and an outer peripheral lip 22B disposed on the outer peripheral side thereof. The inner peripheral lip 22A and the outer peripheral lip 22B are arranged so as to be aligned in the radial direction of the wire insertion hole H. In other words, in the front seal portion 22, the protruding end of the outer peripheral lip 22B and the protruding end of the inner peripheral lip 22A are arranged at the same position in the front-rear direction. For this reason, when the front seal portion 22 is inserted into the cavity 41, the front seal portion 22 is tightly sandwiched between the outer peripheral surface of the electric wire W and the inner peripheral surface of the cavity 41. Can be increased.

  The rear seal portion 23 includes an inner peripheral lip 23A disposed on the inner peripheral side and an outer peripheral lip 23B disposed on the outer peripheral side. The inner peripheral lip 23A is disposed behind the outer peripheral lip 23B. The inner peripheral lip 23A and the outer peripheral lip 23B are arranged so as not to overlap with each other in the front-rear direction.

  For this reason, in the rear seal portion 23, the inner peripheral lip 23A and the outer peripheral lip 23B do not interfere with each other. Therefore, when the electric wire W is inserted into the electric wire insertion hole H, the frictional force generated between the outer peripheral surface of the electric wire W and the inner peripheral lip 23A of the rear seal portion 23 can be reduced. Further, when the rear seal portion 23 is inserted into the cavity 41, the frictional force generated between the inner peripheral surface of the cavity 41 and the outer peripheral lip 23B of the rear seal portion 23 can be reduced.

  Further, as shown in FIG. 3, the inner peripheral surface 25 of the outer peripheral lip 23 </ b> B of the rear seal portion 23 is arranged at a position where it does not contact the outer peripheral surface of the electric wire W passed through the electric wire insertion hole H. For this reason, when the electric wire W is inserted into the electric wire insertion hole H, no frictional force is generated between the outer peripheral surface of the electric wire W and the inner peripheral surface 25 of the outer peripheral lip 23B of the rear seal portion 23.

  Further, as shown in FIG. 5, the inner peripheral surface 25 of the outer peripheral lip 23 </ b> B has a shape extending in the front-rear direction, and the rear edge of the inner peripheral lip 22 </ b> A of the front seal portion 22 and the inner peripheral lip of the rear seal portion 23. It is arranged between the front edge of 23A. The inner peripheral surface of the crimping portion 21 is arranged between the inner peripheral surface 25 of the outer peripheral lip 23B of the rear seal portion 23 and the protruding end of the inner peripheral lip 22A of the front seal portion 22 in the radial direction of the wire insertion hole H. Has been.

  The follower 24 has a cylindrical shape, and a guide surface 26 is formed at the rear end portion of the inner peripheral surface of the follower 24 so as to be inclined radially outward of the electric wire insertion hole H toward the rear. ing. Further, the inner peripheral surface of the follower portion 24 is arranged between the inner peripheral surface 25 of the outer peripheral lip 23B of the rear seal portion 23 and the protruding end of the inner peripheral lip 23A in the radial direction of the electric wire insertion hole H. On the other hand, the outer peripheral surface of the follower portion 24 is configured to be flush with the outer peripheral surface 27 of the inner peripheral lip 23A of the rear seal portion 23 and extend in the front-rear direction.

  The inner diameter of the follower 24 is made smaller than the outer diameter of the electric wire W. When the electric wire W is passed through the electric wire insertion hole H, the outer peripheral surface of the electric wire W comes into contact with the inner peripheral surface of the follower 24. . On the other hand, the outer diameter of the follower 24 is larger than the inner diameter of the cavity 41, and when the follower 24 is inserted into the cavity 41, the outer peripheral surface of the follower 24 comes into contact with the inner peripheral surface of the cavity 41. Yes.

  A dimension L3 from the axis P of the wire insertion hole H to the protruding end of the outer peripheral lip 23B of the rear seal portion 23 is a dimension L4 from the axis P of the electric wire insertion hole H to the protruding end of the outer peripheral lip 22B of the front seal portion 22. Bigger than. For this reason, even when the electric wire W is bent and the rear seal portion 23 is about to be separated from the inner peripheral surface of the cavity 41, there is a gap between the outer peripheral lip 23 </ b> B of the rear seal portion 23 and the inner peripheral surface of the cavity 41. It is not formed, and sealing performance is ensured between them.

  The dimension L1 from the axis P of the electric wire insertion hole H to the protruding end of the inner peripheral lip 23A of the rear seal portion 23 is the protruding end of the inner peripheral lip 22A of the front seal portion 22 from the axial center P of the electric wire insertion hole H. It is smaller than the dimension L2. For this reason, even when the electric wire W is bent and the outer peripheral surface of the electric wire W tries to be separated from the rear seal portion 23, a gap is formed between the outer peripheral surface of the electric wire W and the inner peripheral lip 23A of the rear seal portion 23. The sealing performance is ensured between them. Further, since the inner peripheral lip 23A of the rear seal portion 23 is arranged behind the outer peripheral lip 23B, when the electric wire W is bent, a gap is formed by the inner peripheral lip 23A that is easily affected by the bending first. Can be regulated reliably. Therefore, it is possible to improve the reliability of the sealing performance while ensuring the followability to the bending of the electric wire W in the rear seal portion 23.

  The dimension between the protruding end of the outer peripheral lip 23B of the rear seal portion 23 and the inner peripheral surface 25 of the outer peripheral lip 23B is between the protruding end of the outer peripheral lip 22B of the front seal portion 22 and the protruding end of the inner peripheral lip 22A. Smaller than dimensions. That is, the thickness at the position passing through the protruding end of the outer peripheral lip 23B of the rear seal portion 23 is smaller than the thickness at the position passing through the protruding end of each lip 22A, 22B of the front seal portion 22.

  The dimension between the protruding end of the inner peripheral lip 23A of the rear seal portion 23 and the outer peripheral surface 27 of the inner peripheral lip 23A is such that the protruding end of the outer peripheral lip 22B and the protruding end of the inner peripheral lip 22A of the front seal portion 22 are as follows. Is less than the dimension between. That is, the thickness at the position passing through the protruding end of the inner peripheral lip 23A of the rear seal portion 23 is set to be equal to or less than the thickness at the position passing through the protruding end of each lip 22A, 22B of the front seal portion 22.

  The present embodiment is configured as described above, and its operation will be described subsequently. First, a procedure for attaching the rubber plug 20 to the electric wire W will be described. The rubber plug 20 is passed through the electric wire W in advance, and the core wire is exposed by peeling off the insulation coating at the end of the electric wire W. Here, the rubber plug 20 that has been passed through is moved to the end of the electric wire W, and the insulation coating slightly protrudes from the front end of the crimping portion 21. Then, by crimping the insulation barrel 33, the insulation barrel 33 is crimped together with the crimping portion 21. At the same time, the wire barrel 32 is crimped and crimped to the core wire. In this way, the electric wire W with the terminal fitting 30 in which the electric wire W and the terminal fitting 30 are connected to be conductive is completed.

  Next, the electric wire W with the terminal fitting 30 is inserted into the cavity 41 of the housing 40 from the rear. Then, after each barrel 32, 33 of the terminal fitting 30 was inserted into the cavity 41, the front seal portion 22 of the rubber plug 20 was inserted into the cavity 41, and the substantially front half portion of the rear seal portion 23 was inserted into the cavity 41. By the way, the terminal metal fitting 30 reaches the normal insertion position with respect to the cavity 41, and the lance 44 is locked in a state of being in contact with the locking step portion 34 from the rear. As a result, the terminal fitting 30 is held in the cavity 41 in the retaining state. Although the follower 24 is located outside the cavity 41, the inner peripheral lips 22 </ b> A and 23 </ b> A are in close contact with the outer peripheral surface of the electric wire W, so that there is sufficient space between the electric wire W and the rubber plug 20. Sealability is ensured. On the other hand, since the outer peripheral lips 22 </ b> B and 23 </ b> B are in close contact with the inner peripheral surface of the cavity 41, sufficient sealing performance is ensured between the rubber plug 20 and the housing 40.

  Next, when the cover 50 is attached to the hood portion 42 from the front, as shown in FIG. 1, the terminal fittings 30 are short-circuited by the short terminals 60, and the retainer 51 enters the bending space of the lance 44. The metal fitting 30 is held in a double locked state. Further, when the seal ring 70 is in close contact with the seal ring mounting portion 52 and the inner peripheral surface of the hood portion 42, it is restricted that water enters the housing 40 from between the cover 50 and the housing 40. As shown in FIG. 2, when the terminal fitting 30 is in a half-inserted state with respect to the cavity 41, it is possible to detect half-insertion of the terminal fitting 30 with the cover 50 and the hood portion 42 fitted. As for the seal, although the inner peripheral lip 23A of the rear seal portion 23 is located outside the cavity 41, the front seal portion 22 is inserted into the cavity 41, so that the inside of the cavity 41 is formed by the lips 22A and 22B. It is kept in a sealed state.

  As described above, in the present embodiment, the lips 22A and 22B of the front seal portion 22 are arranged in alignment in the front-rear direction, and the lips 23A and 23B of the rear seal portion 23 are arranged shifted in the front-rear direction. Therefore, the front seal portion 22 is tightly sandwiched between the outer peripheral surface of the electric wire W and the inner peripheral surface of the cavity 41, and the front seal portion 22 can secure a sufficient sealing performance, and the cavity 41 of the rear seal portion 23 can be secured. The increase in insertion force with respect to can be regulated.

  Further, since the protruding end of the inner peripheral lip 23A of the rear seal portion 23 is closer to the axis P of the electric wire insertion hole H than the protruding end of the inner peripheral lip 22A of the front seal portion 22 is shown in FIG. Thus, when the electric wire W is bent, it can control that a clearance gap generate | occur | produces with the internal peripheral lip 23A of the back seal part 23. FIG. Further, since the protruding end of the outer peripheral lip 23B of the rear seal portion 23 is farther from the axis P of the electric wire insertion hole H than the protruding end of the outer peripheral lip 22B of the front seal portion 22, the electric wire W is bent. In this case, it is possible to restrict the generation of a gap at the outer peripheral lip 23B of the rear seal portion 23. Therefore, the followability with respect to the bending of the electric wire W can be improved.

<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 above embodiment, the inner peripheral lip 22A and the outer peripheral lip 22B of the front seal portion 22 are illustrated as being provided one by one. However, according to the present invention, the inner peripheral lip and the outer periphery of the front seal portion are illustrated. A plurality of lips may be provided.

  (2) In the above embodiment, the inner peripheral lip 23A and the outer peripheral lip 23B of the rear seal portion 23 are illustrated as being provided one by one. However, according to the present invention, the inner peripheral lip and the outer periphery of the rear seal portion are illustrated. A plurality of lips may be provided.

  (3) Although the front seal portion 22 and the rear seal portion 23 do not have a region overlapping in the front-rear direction in the above embodiment, according to the present invention, the front seal portion 22 and the rear seal portion 23 are partially in the front-rear direction. It is good also as an aspect which has the area | region which overlaps.

  (4) In the above embodiment, the inner lip 23A of the rear seal portion 23 is illustrated behind the outer lip 23B. However, according to the present invention, the outer lip of the rear seal portion is the inner periphery. It may be arranged behind the lip.

  (5) In the above embodiment, the inner peripheral surface 25 of the outer peripheral lip 23B of the rear seal portion 23 is illustrated as not contacting the outer peripheral surface of the electric wire W. However, according to the present invention, the outer peripheral lip of the rear seal portion The inner peripheral surface may be in contact with the outer peripheral surface of the electric wire W.

20 ... Rubber plug 21 ... Crimp 22 ... Front seal 22A ... Inner lip 22B ... Outer lip 23 ... Rear seal 23A ... Inner lip 23B ... Outer peripheral lip 25 ... Inner peripheral surface of outer peripheral lip of rear seal part 30 ... Terminal metal fitting 33 ... Insulation barrel 40 ... Housing 41 ... Cavity H ... Electric wire insertion hole P ... Axle W ... Electric wire

Claims (6)

It is a rubber plug inserted into the cavity of the housing from the rear, with a tubular shape in which a wire insertion hole for passing an electric wire passes through in the front-rear direction,
A crimping portion to be crimped to the wire passed through the wire insertion hole by the barrel of the terminal fitting;
A front seal portion that is provided behind the crimping portion and is in close contact with the outer peripheral surface of the electric wire and the inner peripheral surface of the cavity;
A rear seal portion provided behind the front seal portion and in close contact with the outer peripheral surface of the electric wire and the inner peripheral surface of the cavity;
In the front seal portion, the outer peripheral lip disposed on the outer peripheral side and the inner peripheral lip disposed on the inner peripheral side are disposed at the same position in the front-rear direction,
In the rear seal part, the outer peripheral lip disposed on the outer peripheral side and the inner peripheral lip disposed on the inner peripheral side are disposed at positions shifted in the front-rear direction. The protruding end of the outer peripheral lip of the rear seal portion has a larger dimension from the axial center of the wire insertion hole than the protruding end of the outer peripheral lip of the front seal portion,
2. The rubber according to claim 1, wherein the protruding end of the inner peripheral lip of the rear seal portion has a smaller dimension from the axial center of the wire insertion hole than the protruding end of the inner peripheral lip of the front seal portion. plug. The dimension between the protruding end of the outer peripheral lip of the rear seal part and the inner peripheral surface of the outer peripheral lip is smaller than the dimension between the protruding end of the outer peripheral lip of the front seal part and the protruding end of the inner peripheral lip. ,
The dimension between the protruding end of the inner peripheral lip of the rear seal part and the outer peripheral surface of the inner peripheral lip is less than the dimension between the protruding end of the outer peripheral lip of the front seal part and the protruding end of the inner peripheral lip. The rubber stopper according to claim 1 or 2, wherein the rubber stopper is provided.   The rubber plug according to any one of claims 1 to 3, wherein the outer peripheral lip and the inner peripheral lip of the rear seal portion are arranged so as not to have an overlapping region in the front-rear direction.   The inner peripheral surface of the outer peripheral lip of the rear seal portion is disposed at a position that does not contact the outer peripheral surface of the electric wire passed through the electric wire insertion hole. The rubber stopper according to item.   The rubber plug according to any one of claims 1 to 5, wherein a protruding end of the inner peripheral lip of the rear seal portion is disposed rearward of a protruding end of the outer peripheral lip.

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