JP2013062059A - Rubber plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deterioration in sealing properties between a connector housing and an electric wire.SOLUTION: A rubber plug 10 which is inserted into a cavity 21 provided on a connector housing 20 while being externally fitted to an electric wire W, and seals between an inner wall of the cavity 21 and the electric wire W, comprises: a cylindrical rearward sealing part 13 which is housed in the cavity 21 in the form of protruding rearward from the cavity 21; an adhering part 16 which is formed on a rear end part of the rearward sealing part 13; and an easily deformable part 17 which is provided on the rearward sealing part 13 so as to be disposed in the cavity 21.

Description

  The present invention relates to a rubber plug.

  Conventionally, the thing of patent documents 1 is known as a rubber stopper for sealing between a connector housing and an electric wire. This is provided with a cylindrical seal portion that is inserted together with a terminal fitting into a cavity provided in the connector housing in a state of being externally fitted to an electric wire. An outer peripheral lip that is in close contact with the inner peripheral surface of the cavity is formed on the outer peripheral surface of the seal portion, and an inner peripheral lip that is in close contact with the outer peripheral surface of the electric wire is formed on the inner peripheral surface of the seal portion. The seal portion seals the outer peripheral lip to the inner peripheral surface of the cavity and seals the gap between the connector housing and the electric wire in a liquid-tight manner by bringing the inner peripheral lip into close contact with the outer peripheral surface of the electric wire. . The seal portion is formed so as to protrude from the cavity in the direction in which the electric wire is drawn, and water flows between the inner peripheral surface of the cavity and the outer peripheral surface of the electric wire, so that the gap between the connector housing and the electric wire is Suppresses the accumulation of water.

Japanese Utility Model Publication No. 7-27069

  However, when the electric wire drawn out from the cavity is pulled in a direction intersecting the drawing direction of the electric wire and the electric wire is bent, a gap may be generated between the seal portion and the electric wire. If there is a gap between the seal part and the electric wire, water will flow into the gap and a water pool will be created in the gap or the accumulated water will freeze, resulting in a seal between the rubber plug and the electric wire. It will decline.

  This invention is completed based on the above situations, Comprising: It aims at suppressing that the sealing performance between a connector housing and an electric wire falls.

  As a means for achieving the above object, the present invention is inserted from the rear into a cavity provided in the connector housing in a state of being externally fitted to the electric wire, and seals between the inner wall of the cavity and the electric wire. A rubber plug, which is accommodated in the cavity in a form protruding rearward from the cavity in the direction in which the electric wire is drawn out, and is in close contact with the inner peripheral surface of the cavity from the rear end of the cavity toward the front Formed in the lead-out portion of the wire at the rear end portion of the seal portion, and a close-contact portion closely contacting the outer peripheral surface of the wire, and provided in the seal portion so as to be disposed in the cavity And an easily deformable portion formed thinner than the close contact portion.

According to the rubber plug having such a configuration, the easily deformable portion can be bent and deformed more easily than the close contact portion, so that the electric wire drawn backward from the cavity is pulled in a direction intersecting the electric wire drawing direction. When the wire is bent, the easily deformable portion can be deformed in accordance with the bending of the electric wire with the close contact portion being in close contact with the outer peripheral surface of the electric wire. That is, the seal part located behind the easily deformable part can follow the electric wire.
In addition, the seal part protrudes rearward from the cavity, and the seal part is in close contact with the inner peripheral surface of the cavity from the rear end of the cavity toward the front, so that the inner peripheral surface of the cavity and the outer peripheral surface of the electric wire Water can be prevented from flowing in between. Thereby, while being able to suppress that water accumulates between a connector housing and an electric wire, it can control that a crevice is made between a seal part and an electric wire, and the sealing nature between a rubber plug and an electric wire falls. Can be suppressed.

The following configuration is preferable as an embodiment of the present invention.
The inner wall of the seal portion between the easily deformable portion and the close contact portion may be configured to taper toward the axial center of the seal portion as it goes from the easy deformable portion to the close contact portion.
According to such a configuration, since the rigidity of the seal portion can be gradually increased from the easily deformable portion to the close contact portion, the seal portion can be easily followed by the electric wire starting from the easily deformable portion. In addition, since the inner wall of the seal portion is formed so as to taper toward the close contact portion from the easily deformable portion, when the electric wire is bent, the inner wall of the seal portion can be easily aligned with the bent electric wire. It is possible to further suppress the formation of a gap between the wire and the electric wire.
In addition, since the inner wall of the seal portion is tapered toward the close contact portion from the easily deformable portion, the insertion resistance of the wire can be reduced when the wire is inserted through the seal portion.

In front of the easily deformable portion, an inner peripheral lip that is in close contact with the outer peripheral surface of the electric wire is formed adjacent to the easily deformable portion by projecting inward from the inner surface of the seal portion over the entire circumference. It is good also as composition which has.
According to such a configuration, the inner peripheral lip is brought into close contact with the electric wire, whereby the easily deformable portion can be more easily bent and deformed with the vicinity of the easily deformable portion as a fulcrum from the inner peripheral lip.

  It is good also as a structure by which the bending space was provided between the said easily deformable part and the said electric wire. According to such a configuration, since the easily deformable portion can be deformed so as to narrow the bending space, the easily deformable portion can be more easily bent and deformed.

  ADVANTAGE OF THE INVENTION According to this invention, it can suppress that the sealing performance between a connector housing and an electric wire falls.

Cross section of rubber stopper Sectional drawing which shows the state inserted in the cavity in the state where the rubber plug was fitted on the electric wire Sectional drawing which shows the state by which the electric wire was pulled in the direction which cross | intersects the drawing-out direction of an electric wire in the state which inserted the rubber stopper

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
In this embodiment, in a state of being externally fitted to the electric wire W, it is inserted into the cavity 21 provided in the connector housing 20 made of synthetic resin together with the terminal fitting 30 from the rear, and the space between the inner wall of the cavity 21 and the electric wire W is sealed. A rubber stopper 10 is illustrated.

  The cavity 21 has a circular cross section and is formed through the connector housing 20 in the front-rear direction as shown in FIG.

  The terminal fitting 30 is made of a conductive metal and is connected to the end of the electric wire W. A barrel 31 is formed at the rear end portion of the terminal fitting 30, and the terminal fitting 30 is attached to the front end portion of the rubber plug 10 fitted on the electric wire W by caulking and crimping so that the terminal fitting 30 is rubber plugged. 10 is fixed to the end of the electric wire W.

  The rubber stopper 10 is made of an elastic member and has a substantially cylindrical shape as shown in FIG. The rubber plug 10 can be inserted into the cavity 21 with the electric wire W inserted therein, and is formed on the front end portion of the rubber plug 10 and behind the pressure bonding section 11. The front seal portion 12 and the rear seal portion 13 formed behind the front seal portion 12 are provided.

  As shown in FIGS. 2 and 3, an electric wire W is formed in the crimping portion 11 so as to be inserted from the rear. Further, the crimping portion 11 is caulked and crimped together with the electric wire W by the barrel 31 of the terminal fitting 30 at the end of the electric wire W.

  As shown in FIG. 1, the front seal portion 12 is located at a substantially central portion in the front-rear direction of the rubber plug 10 and is formed integrally with the crimp portion 11 and the rear seal portion 13. As shown in FIGS. 2 and 3, an electric wire W can be inserted from the rear inside the front seal portion 12, and an outer peripheral lip 14 projecting outward is formed on the outer peripheral surface of the front seal portion 12. An inner peripheral lip 15 that protrudes inward is formed on the inner peripheral surface of the front seal portion 12.

  The outer peripheral lip 14 is formed on the outer peripheral surface of the front seal portion 12 over the entire periphery, and is arranged in a plurality of rows (two in this embodiment) in the front-rear direction. Further, as shown in FIG. 2, the outer peripheral lip 14 is in close contact with the inner peripheral surface of the cavity 21 over the entire periphery, so that a liquid is formed between the outer peripheral surface of the front seal portion 12 and the inner peripheral surface of the cavity 21. It is designed to seal tightly.

The inner peripheral lip 15 is formed on the inner peripheral surface of the front seal portion 12 over the entire periphery, and is arranged in a plurality of rows (two in this embodiment) in the front-rear direction. Further, as shown in FIG. 2, the inner peripheral lip 15 is in close contact with the outer peripheral surface of the electric wire W over the entire periphery, so that a liquid is formed between the inner peripheral surface of the front seal portion 12 and the outer peripheral surface of the electric wire W. It is designed to seal tightly.
The outer peripheral lip 14 and the inner peripheral lip 15 are alternately formed in the front-rear direction, and the inner peripheral lip 15 is disposed at the rear end of the front seal portion 12.

  As shown in FIG. 1, the rear seal portion 13 is located at the rear end portion of the rubber plug 10, and the rear seal portion 13 has an electric wire from the rear as shown in FIGS. 2 and 3. W is formed to be insertable. Further, the outer peripheral shape of the rear seal portion 13 is linearly formed in the front-rear direction so as to follow the axial center of the rear seal portion 13, and is approximately the same size as the inner peripheral shape of the cavity 21 of the connector housing 20. Is formed. Further, as shown in FIG. 2, the rear seal portion 13 is disposed in the cavity 21 with the front end portion of the rear seal portion 13 in a state where the rubber plug 10 is inserted to the normal position with respect to the cavity 21. The rear end portion of the rear seal portion 13 is set so as to protrude rearward from the rear end portion of the cavity 21. Moreover, the electric wire W is pulled out rearward from the rear end portion of the rear seal portion 13.

  Now, at the rear end portion of the rear seal portion 13, a close contact portion 16 that is in close contact with the outer peripheral surface of the electric wire W is formed, and the front end portion of the rear seal portion 13 is thicker than the close contact portion 16. A thin easily deformable portion 17 is formed.

The close contact portion 16 has a form protruding toward the axis of the rear seal portion 13, and the inner diameter dimension of the close contact portion 16 is set smaller than the outer diameter dimension of the electric wire W.
The easily deformable portion 17 is formed adjacent to the rear side of the inner peripheral lip 15 formed at the rear end portion of the front seal portion 12. The inner surface of the easily deformable portion 17 is formed to be recessed outward from the adjacent inner peripheral lip 15, and the inner diameter dimension of the easily deformable portion 17 is set larger than the outer diameter dimension of the electric wire W.
Further, the inner wall of the rear seal portion 13 between the easily deformable portion 17 and the close contact portion 16 is formed so as to taper toward the axis of the rear seal portion 13 from the easy deformable portion 17 toward the close contact portion 16. Yes. That is, the inner wall of the rear seal portion 13 between the easily deformable portion 17 and the close contact portion 16 is formed in a mortar shape linearly widened from the thick close contact portion 16 toward the thin easily deformable portion 17. ing.

  Further, as shown in FIG. 2, the close contact portion 16 is in close contact with the outer peripheral surface of the electric wire W over the entire circumference in a state where the electric wire W is inserted into the rear seal portion 13. In a state where the electric wire W is inserted into the rear seal portion 13, the rear seal portion 13 is separated from the outer peripheral surface of the electric wire W. That is, as shown in FIG. 2, the inner wall of the rear seal portion 13 is gradually separated from the outer peripheral surface of the electric wire W as it goes from the rear to the front, and the inner peripheral surface of the easily deformable portion 17 and the outer periphery of the electric wire W. A bending space S is formed between the surfaces.

  The rubber plug 10 of the present embodiment has the above-described configuration. Next, the rubber plug 10 is assembled to the electric wire W, and the rubber plug 10 that is externally fitted to the electric wire W is connected to the cavity with the terminal fitting 30. The function and effect when inserted into 21 will be described. In addition, an operation and effect when the electric wire W drawn backward from the cavity 21 is pulled in a direction intersecting with the drawing direction of the electric wire W will be described.

  The electric wire W is inserted from behind the rear seal portion 13 in the rubber plug 10, and the electric wire W is inserted to a proper position where the end of the electric wire W is exposed from the front end of the crimping portion 11. Here, the inner wall of the rear seal portion 13 is formed in a mortar shape that is linearly widened from the thick contact portion 16 toward the thin easily deformable portion 17. Since the outer diameter of the electric wire W is set to be smaller than the outer diameter of the electric wire W, the outer peripheral surface of the electric wire W inserted into the rear seal portion 13 is closer to the inner wall of the rear seal portion 13 from the close contact portion 16 toward the easily deformable portion 17. It will be in a state separated from. That is, when the electric wire W is inserted into the rubber plug 10, the inner wall of the rear seal portion 13 near the easily deformable portion 17 and the outer peripheral surface of the electric wire W are not in contact with each other. Thereby, the insertion resistance at the time of inserting the electric wire W through the rubber plug 10 can be reduced as compared with the rear seal portion in which the entire inner wall contacts the outer peripheral surface of the electric wire W.

  Further, when the electric wire W is inserted to the proper position with respect to the rubber plug 10, the inner peripheral lip 15 of the front seal portion 12 closely contacts the outer peripheral surface of the electric wire W as shown in FIG. At the same time, the contact portion 16 of the rear seal portion 13 is in close contact with the outer peripheral surface of the electric wire W over the entire circumference, so that the space between the electric wire W and the rubber plug 10 is sealed in a liquid-tight manner. At this time, although not shown, the outer peripheral shape of the rear end portion of the rear seal portion 13 is slightly swollen outward by inserting the electric wire W into the rear seal portion 13. Yes.

  When the electric wire W is inserted through the rubber plug 10 to a proper position, the barrel 31 of the terminal fitting 30 is crimped to the crimping portion 11 of the rubber plug 10.

  Next, as shown in FIG. 2, the rubber plug 10 that is externally fitted to the electric wire W from the rear of the connector housing 20 is inserted together with the terminal fitting 30 to the normal position of the cavity 21. Here, the outer peripheral lip 14 of the front seal portion 12 is in close contact with the inner peripheral surface of the cavity 21 over the entire periphery. Further, the rear end portion of the rear seal portion 13 in a slightly swollen state is in close contact with the inner peripheral surface of the cavity 21 over the entire periphery, so that the outer periphery of the rear portion from the easily deformable portion 17 in the rear seal portion 13. The surface is in close contact with the inner peripheral surface of the cavity 21. Thereby, the space between the electric wire W and the inner wall of the cavity 21 is sealed in a liquid-tight manner, and the sealing performance between the connector housing 20 and the rubber plug 10 is improved as compared with the case where only the outer peripheral lip 14 is sealed. be able to. In addition, since the rear end portion of the rear seal portion 13 is set so as to protrude rearward from the rear end portion of the cavity 21, water accumulation between the connector housing 20 and the electric wire W is suppressed. Can be done.

By the way, the electric wire W pulled out backward from the cavity 21 due to the wiring of the electric wire W or the like may be pulled in a direction intersecting the electric wire drawing direction, and the electric wire may be bent.
At this time, according to the present embodiment, the easily deformable portion 17 of the rear seal portion 13 is formed thinner than the close contact portion 16 and gradually increases in thickness from the easily deformable portion 17 to the close contact portion 16. Therefore, the easily deformable portion 17 can be bent and deformed in accordance with the bending of the electric wire W in a state where the close contact portion 16 is in close contact with the outer peripheral surface of the electric wire W. In other words, the rear portion of the rear seal portion 13 can be made to follow the electric wire W in a state where the close contact portion 16 is in close contact with the outer peripheral surface of the electric wire W. Thereby, it can suppress that a clearance gap produces between the rear side seal part 13 and the electric wire W, and can suppress that the sealing performance between the rubber stopper 10 and the electric wire W falls.

  Moreover, according to this embodiment, since the inner wall of the rear seal part 13 is formed in a tapered mortar shape from the front to the rear, the inner wall of the rear seal part 13 is bent when the electric wire W is bent. It is possible to make it easy to follow the electric wire W. Thereby, it is possible to further suppress the formation of a gap between the rear seal portion 13 and the electric wire W.

  Furthermore, according to the present embodiment, the inner peripheral lip 15 of the front seal portion 12 is formed adjacent to the front side of the easily deformable portion 17, and the inner peripheral surface of the easily deformable portion 17 and the outer peripheral surface of the electric wire W are Since the bending space S is formed between them, the easily deforming portion 17 can be easily bent and deformed so as to narrow the bending space S with the vicinity of the easily deforming portion 17 from the inner peripheral lip 15 as a fulcrum. . Thereby, the back side seal part 13 can be made to follow the electric wire W more in the state which contact | adhered the contact part 16 to the outer peripheral surface of the electric wire W, and the sealing performance between the rubber plug 10 and the electric wire W falls. This can be further suppressed.

<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 outer peripheral surface of the easily deformable portion 17 is configured to contact the inner peripheral surface of the cavity 21 over the entire circumference, but the present invention is not limited to such an embodiment. For example, a gap may be formed between the outer peripheral surface of the easily deformable portion 17 and the inner peripheral surface of the cavity 21.
(2) In the above embodiment, the inner peripheral lip 15 and the outer peripheral lip 14 are alternately arranged in the front-rear direction. However, the present invention is not limited to such an embodiment. The lip 15 and the outer peripheral lip 14 may be arranged at the same position.
(3) In the above embodiment, the inner wall of the rear seal portion 13 is configured to linearly widen from the rear to the front. However, the present invention is not limited to such an embodiment. You may comprise in the form which the inner wall of the rear side seal part 13 curvedly widened toward the front from back.

10: Rubber stopper 13: Rear seal part (seal part)
15: Inner peripheral lip 16: Close contact portion 17: Easily deformable portion 20: Connector housing 21: Cavity S: Deflection space W: Electric wire

Claims (4)

A rubber plug that is inserted from behind into a cavity provided in the connector housing in a state of being externally fitted to the electric wire, and seals between the inner wall of the cavity and the electric wire,
A cylindrical seal portion that is housed in the cavity in a form protruding rearward from the cavity in the direction of drawing out the electric wire, and is in close contact with the inner peripheral surface of the cavity from the rear end portion of the cavity toward the front;
A close contact portion that is formed in a lead-out portion of the electric wire at a rear end portion of the seal portion, and is in close contact with an outer peripheral surface of the electric wire;
A rubber plug, comprising: an easily deformable portion provided in the seal portion so as to be disposed in the cavity and having a thickness thinner than that of the close contact portion.   The inner wall of the seal portion between the easily deformable portion and the close contact portion is formed so as to taper toward the axis of the seal portion as it goes from the easy deformable portion to the close contact portion. The rubber stopper according to claim 1.   In front of the easily deformable portion, an inner peripheral lip that is in close contact with the outer peripheral surface of the electric wire is formed adjacent to the easily deformable portion by projecting inward from the inner surface of the seal portion over the entire circumference. 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 a bending space is provided between the easily deformable portion and the electric wire.

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