JP2014183030A - Rubber plug - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rubber plug capable of securing predetermined sealability even when a situation is changed.SOLUTION: A rubber plug 10 comprises a rubber plug body 11 penetrated with a wire insertion hole 17 in a longitudinal direction. A wire 90 is inserted through the wire insertion hole 17 in the rubber plug body 11 in a liquid-tight manner, and the rubber plug body 11 is inserted into a cavity 81 of a connector housing 80 from the back and elastically adhered on an inner peripheral surface of the cavity 81. In the rubber plug body 11, an inner/outer seal applicable rip 21 is provided which is capable of changing a position of adhesion to the connector housing 80 inside/outside of the cavity 81 from a rear end portion of the inner peripheral surface of the cavity 81 to the vicinity of an opening of the cavity 81 on a rear surface of the connector housing 80.

Description

  The present invention relates to a rubber plug.

  The rubber plug disclosed in Patent Document 1 includes a cylindrical rubber plug body having a wire insertion hole. The wire connected to the terminal fitting is inserted liquid-tightly into the wire insertion hole of the rubber plug body. A lip is provided around the outer peripheral surface of the rubber plug body. The rubber plug is inserted into the cavity of the connector housing following the terminal fitting, and the lip elastically adheres to the inner peripheral surface of the cavity, thereby fulfilling the role of keeping the inside of the cavity liquid-tight. In the case of Patent Document 1, when the rubber plug is inserted into the cavity, the rear end portion of the rubber plug main body jumps out of the cavity and is arranged.

JP 2010-73485 A

  By the way, for example, even when trying to share the rubber plug for a plurality of types of connector housings having different front and rear lengths of the cavity, the lip may not be accommodated in the cavity having a short front and rear length, and the cavity may protrude backward. There is a possibility that the inside cannot be sufficiently sealed. Even when applied to a single connector housing, for example, when a terminal fitting or an electric wire is elongated due to aging or thermal influence, the lip is not accommodated in the cavity as described above. There are circumstances that can not be sealed.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to provide a rubber plug capable of ensuring a predetermined sealing property even when the situation changes.

  The present invention is a rubber plug that is inserted into the cavity of the connector housing from the rear and elastically tightly contacts the inner peripheral surface of the cavity, thereby keeping the inside of the cavity liquid-tight. Continuing to the rear end of the rubber plug main body, it is possible to elastically contact the connector housing, and the position of contact with the connector housing is changed from the rear end of the inner peripheral surface of the cavity to the cavity on the rear surface of the connector housing. It is characterized in that it is provided with a lip corresponding to an inner and outer seal that can be changed in and out of the cavity around the opening.

  Even if the situation changes, the inner / outer seal compatible lip adheres to either the inner peripheral surface of the cavity or the rear surface of the connector housing, thereby preventing water from entering the cavity. Can be kept liquid-tight.

It is sectional drawing which shows the usage condition of the rubber stopper of Example 1. FIG. It is an expanded sectional view of the principal part of FIG. It is an expanded sectional view which shows another usage condition of a rubber stopper. It is an expanded sectional view which shows another usage condition of a rubber stopper. It is a perspective view of a rubber stopper. It is a side view of a rubber stopper. It is a front view of a rubber stopper.

Preferred embodiments of the present invention are shown below.
The lip corresponding to the inner and outer seals is in a natural state before being elastically deformed, and extends at least forward in an extension portion extending so as to protrude outward from the rear end portion of the rubber plug main body, and on the front end side of the extension portion. And a seal main body that protrudes and can be brought into close contact with the connector housing. Since the seal body portion has a portion protruding forward, the seal body portion can be closely adhered around the opening of the cavity on the rear surface of the connector housing. Moreover, when the extension part is deformed, it is possible to flexibly cope with a change in the situation. Moreover, the lip for inner and outer seals does not have a particularly complicated shape.

  An electric wire insertion hole is formed in the rubber plug main body so as to penetrate in the front-rear direction, and the rubber plug main body is elastically formed on the outer peripheral surface in front of the lip corresponding to the inner and outer seals and on the inner peripheral surface of the cavity. An outer peripheral lip that can be closely attached is provided around the inner peripheral surface of the wire insertion hole of the rubber plug body, and an inner peripheral lip that can be elastically attached to the outer peripheral surface of the electric wire is provided around the inner peripheral lip. It arrange | positions ahead rather than the said outer periphery lip. In the rear part of the rubber plug body, the gap between the inner peripheral surface of the wire insertion hole and the outer peripheral surface of the electric wire is filled by the outer peripheral lip and the inner / outer seal compatible lip. Even if water is going to enter, water immersion in the rear part of the rubber plug body is temporarily prevented. Also, even if water passes through the rear part of the rubber plug body, the water immersion at the front part of the rubber plug body is secondarily reliably prevented by the inner peripheral lip.

<Example 1>
A first embodiment of the present invention will be described with reference to FIGS. The rubber plug 10 according to the first embodiment is externally fitted to the electric wire 90 connected to the terminal fitting 60 and is inserted into the cavity 81 of the connector housing 80.

First, the connector housing 80 and the terminal fitting 60 will be briefly described.
The connector housing 80 is made of a synthetic resin and has a block shape. As shown in FIG. 1, a cavity 81 into which the terminal fitting 60 can be inserted is formed through the connector housing 80 in the front-rear direction. At the opening edge portion of the cavity 81 on the rear surface of the connector housing 80, a guiding edge portion 82 for guiding the terminal fitting 60 into the cavity 81 is formed to taper rearwardly. Further, a bendable lance 83 is formed on the inner wall of the cavity 81 of the connector housing 80 so as to protrude forward.

  The terminal fitting 60 is formed by bending a conductive metal plate or the like, and has a shape elongated in the front-rear direction as a whole as shown in FIG. Specifically, the terminal fitting 60 includes a cylindrical box portion 61, an open barrel-shaped wire barrel 62 that continues to the rear of the box portion 61, and an open barrel-shaped insulation barrel 63 that continues to the rear of the wire barrel 62. Consists of. A mating male tab (not shown) is inserted into the box portion 61 from the front to enable connection. The box portion 61 is provided with a lance receiving portion 64 that can be locked to the lance 83. The wire barrel 62 is connected by crimping to the core wire 92 exposed by removing the covering 91 at the terminal portion of the electric wire 90, and the insulation barrel 63 is connected by pressure bonding to the rubber plug 10 fitted to the terminal portion of the electric wire 90. ing. As shown in FIG. 1, when the electric wire 90 is properly inserted into the cavity 81 of the connector housing 80, the lance receiving portion 64 is elastically locked to the lance 83, whereby the terminal fitting 60 comes out of the cavity 81. Is to be prevented.

Next, the structure of the rubber plug 10 will be specifically described.
The rubber plug 10 is made of rubber such as silicon rubber, and includes a substantially cylindrical rubber plug main body 11 extending in the front-rear direction as shown in FIGS. 5 and 6. A step 12 in the radial direction is formed in the front-rear direction of the outer peripheral surface of the rubber plug body 11. In the rubber plug main body 11, a portion positioned forward with the step 12 as a boundary is a front portion 13, and a portion positioned rearward with the step 12 as a boundary is a rear portion 14 having a larger diameter than the front portion 13. Yes. On the outer peripheral surface of the front portion 13 of the rubber plug main body 11, a pressure-bonded surface 15 that is continuous without a step along the front-rear direction is formed, and the insulation barrel 63 of the terminal fitting 60 is attached to the pressure-bonded surface 15 by pressure bonding. .

  An outer peripheral lip 16 projects from the outer peripheral surface of the rear portion 14 of the rubber plug main body 11. The outer peripheral lip 16 is configured to circulate around the outer peripheral surface of the rear portion 14, and a plurality of the outer peripheral lips 16 are arranged in the front-rear direction. In the case of Example 1, as shown in FIG. 6, among the outer peripheral lips 16, the outermost peripheral lip 16 at the foremost position is arranged immediately after the step 12, and the outermost peripheral lip 16 at the last position is in a natural state. Further, it is arranged so as to be hidden inside a lip 21 corresponding to the inner and outer seals described later. As shown in FIG. 1, when the rubber plug 10 is accommodated in the cavity 81, each outer peripheral lip 16 is elastically adhered to the inner peripheral surface of the cavity 81 in a crushed state.

  Further, a wire insertion hole 17 is formed in the center portion of the rubber plug body 11 so as to penetrate in the front-rear direction. An inner peripheral lip 18 projects from the inner peripheral surface of the wire insertion hole 17 in the front portion 13 of the rubber plug body 11. The inner peripheral lip 18 is configured to circulate around the inner peripheral surface of the wire insertion hole 17 of the front portion 13, and a plurality of inner peripheral lips 18 are arranged in the front-rear direction. As shown in FIG. 1, an electric wire 90 is inserted into the electric wire insertion hole 17 of the rubber plug main body 11, and in this state, each inner peripheral lip 18 is elastic in a collapsed state on the outer peripheral surface of the covering 91 of the electric wire 90. It comes to adhere to. Further, each inner peripheral lip 18 is disposed in front of each outer peripheral lip 16, and more specifically, the inner peripheral lip 18 at the last position is disposed in front of the outer peripheral lip 16 at the foremost position.

  Now, an inner and outer seal corresponding lip 21 is connected to the rear end of the rear portion 14 of the rubber plug main body 11. As shown in FIG. 5, the inner / outer seal-compatible lip 21 protrudes from the outer peripheral surface of the rear portion 14 of the rubber plug main body 11 over the entire periphery. As shown in FIG. Has a remarkably large protruding dimension (overhang dimension). Specifically, as shown in FIG. 6, the inner / outer seal-compatible lip 21 includes an extension portion 22 that projects radially outward from the rear end of the rear portion 14 of the rubber plug main body 11 when in a natural state. It has a seal body portion 23 that is continuous with the outer end side of the protruding portion 22 (the protruding tip side) and protrudes in both the front and rear directions. The extension part 22 and the seal body part 23 both have the same cross-sectional shape over the entire circumference.

  The extending portion 22 has a thin cross-sectional band shape (see FIG. 2), and although not shown in detail, in the natural state, after extending from the outer periphery of the rear end of the rubber plug body 11 to the rear, It is configured to extend outward (see FIG. 6). As shown in FIGS. 2 to 4, the extending portion 22 can be bent and deformed in a direction of falling radially inward with the rear end of the rubber plug body 11 as a fulcrum. On the other hand, the seal body part 23 is formed in a substantially circular shape with a sufficiently thick cross-section than the extension part 22 (see FIG. 2). It is made larger than the amount (see FIG. 6). As will be described later, the front surface of the seal body 23 can be elastically adhered to the inner peripheral surface of the cavity 81 of the connector housing 80, and can also be elastically also around the opening of the cavity 81 on the rear surface of the connector housing 80. It is possible to adhere.

Next, the usage mode of the rubber stopper 10 of Example 1 is demonstrated.
The rubber plug 10 of the first embodiment is applicable to a plurality of types of connector housings 80 having different front and rear lengths of the cavity 81. Hereinafter, according to the longitudinal length of the cavity 81, the first usage mode (see FIGS. 1 and 2), the second usage mode (see FIG. 3) in which the longitudinal length of the cavity 81 is shorter than the first usage mode, and the first A third usage mode (see FIG. 4) in which the longitudinal length of the cavity 81 is longer than that of the first usage mode will be described.

(First usage mode)
As shown in FIG. 1, the terminal fitting 60 is inserted into the cavity 81 of the connector housing 80 from the rear. When the terminal fitting 60 is properly inserted into the cavity 81, the terminal fitting 60 is prevented from coming off by the lance 83, and the rubber plug 10 is inserted into the rear end of the cavity 81. In this case, as shown in FIG. 2, each outer peripheral lip 16 is elastically adhered to the inner peripheral surface of the cavity 81. Further, the front surface of the seal main body portion 23 of the inner / outer seal compatible lip 21 elastically contacts the outer edge portion of the leading edge portion 82 around the opening of the cavity 81 on the rear surface of the connector housing 80, and accordingly, the inner / outer seal compatible The extending portion 22 of the lip 21 is tilted backward from the natural state position. Further, the lead-in edge portion 82 of the connector housing 80 is covered with the inner and outer seal corresponding lip 21 over the entire circumference. Therefore, even if water tries to enter the cavity 81 of the connector housing 80 from the rear, the rear end opening of the cavity 81 is substantially blocked by the inner / outer seal-compatible lip 21, so that the water enters the cavity 81. It is temporarily prevented from entering. Even if the inner and outer seal-compatible lip 21 is deformed by the pressure of high-pressure washing water or the like, and the water passes between the seal body 23 and the connector housing 80, the position of the terminal fitting 60 by the outer peripheral lip 16 Water is surely prevented from flowing around to the side.

  On the other hand, since the rear portion 14 of the rubber plug main body 11 is compressed in the diameter reducing direction by elastically deforming the inner / outer seal-compatible lip 21 and each outer peripheral lip 16, the inner peripheral surface of the wire insertion hole 17 and the electric wire 90 in the rear portion 14. A gap with the outer peripheral surface is filled, and it is difficult for water to enter the gap. In addition, even if water enters the gap and tries to flow forward, each inner peripheral lip 18 is in close contact with the outer peripheral surface of the electric wire 90, so that it is ensured that water flows around the terminal fitting 60 side. Is prevented.

(Second usage mode)
In the case of the second usage mode, since the front and rear length of the cavity 81 is short, the front surface of the seal body 23 of the inner / outer seal-compatible lip 21 is around the opening of the cavity 81 on the rear surface of the connector housing 80 as shown in FIG. Then, it elastically abuts on the outer side of the leading edge 82, and accordingly, the extending portion 22 of the lip 21 corresponding to the inner and outer seals is slightly inclined backward from the natural position. In this case, the front surface of the seal main body portion 23 is in a more upright state than in the case of the usage mode 1 and is disposed substantially along the radial direction of the rubber plug main body 11. Further, the extending portion 22 has a smaller inclination angle with respect to the radial direction of the rubber plug body 11 than in the case of the usage mode 1. Also in the second usage mode, the inner / outer seal-compatible lip 21 prevents water from entering the cavity 81, and the outer peripheral lips 16 reliably prevent water from entering the terminal fitting 60 side.

(Third usage mode)
In the case of the third usage mode, since the longitudinal length of the cavity 81 is long, the entire seal body 23 of the inner / outer seal-compatible lip 21 is located at the rear end portion of the cavity 81 of the connector housing 80 as shown in FIG. Inserted. At this time, the outer surface of the seal body portion 23 (the surface that was the front surface in the natural state) is elastically adhered to the inner peripheral surface of the cavity 81, and the inner surface of the seal body portion 23 (the surface that was the rear surface in the natural state). Is elastically in close contact with the outer peripheral surface of the covering 91 of the electric wire 90, and the extended portion 22 is greatly collapsed rearward. For this reason, even if water tries to enter the cavity 81 from behind, the ingress of water is primarily prevented by the close contact between the outer surface of the seal body 23 and the inner peripheral surface of the cavity 81, and each outer peripheral lip Intrusion of water is reliably prevented secondarily by the close contact between 16 and the inner peripheral surface of the cavity 81. Further, even if water enters from the rear along the outer peripheral surface of the covering 91 of the electric wire 90, the infiltration of water is primarily caused by the close contact between the inner surface of the seal main body portion 23 and the outer peripheral surface of the covering 91 of the electric wire 90. Further, the infiltration of water is reliably prevented secondarily by the close contact between each inner peripheral lip 18 and the outer peripheral surface of the covering 91 of the electric wire 90. Therefore, the water immersion to the terminal metal fitting 60 side is prevented reliably. In particular, in the case of the third usage mode, the lip 21 corresponding to the inner and outer seals is elastically sandwiched between the outer peripheral surface of the covering 91 of the electric wire 90 and the inner peripheral surface of the cavity 81, so that the rubber plug body 11 Inundation at the rear 14 is better prevented.

  As described above, according to the first embodiment, even when the front and rear lengths of the cavity 81 are different, the lip 21 corresponding to the inner and outer seals is formed on the rear surface of the connector housing 80 from the rear end portion of the inner peripheral surface of the cavity 81. By changing the contact position around the opening, the rear end opening of the cavity 81 can be liquid-tightly closed, so that water can be prevented from entering the cavity 81.

  In this case, not only when the front and rear lengths of the cavities 81 are different, even when the single connector housing 80 has the same front and rear lengths of the cavities 81, for example, the electric wires 90 and the terminal fittings 60 due to time-dependent or thermal influences. Since the outer peripheral lip 16 at the final position may protrude outside the cavity 81 due to the extension of the rubber plug, it is possible to apply the rubber stopper 10 of the first embodiment that can flexibly cope with such a change in the situation. Use effect is great.

  Further, since the seal main body portion 23 of the inner / outer seal-compatible lip 21 includes a portion that protrudes forward from the extending portion 22 in a natural state, the seal body portion 23 can be well adhered around the opening of the cavity 81 on the rear surface of the connector housing 80. It becomes possible. Further, the flexibility of the inner / outer seal correspondence ship 21 is enhanced by the extension portion 22 being flexibly deformed according to the situation.

  Furthermore, since each inner peripheral lip 18 is disposed at the front portion 13 of the rubber plug body 11 and each outer peripheral lip 16 is disposed at the rear portion 14 of the rubber plug body 11, The outer peripheral lip 16 and the inner / outer seal-compatible lip 21 fill a gap between the inner peripheral surface of the electric wire insertion hole 17 and the outer peripheral surface of the electric wire 90, making it difficult for water to enter the gap. Inundation is primarily prevented. Also, even if water passes through the rear part 14 of the rubber plug body 11, water immersion in the front part 13 of the rubber plug body 11 is secondarily blocked by the inner peripheral lip 18; It is possible to reliably prevent water from entering between the electric wires 90.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following aspects are also included in the technical scope of the present invention.
(1) The inner / outer seal-compatible lip may be in a form capable of being in close contact with the rear end of the inner peripheral surface of the cavity and the periphery of the opening of the cavity on the rear surface of the connector housing.
(2) In the third usage mode, the inner surface of the seal main body portion of the inner / outer seal-compatible lip may not be in contact with the outer peripheral surface of the electric wire coating.
(3) Each outer peripheral lip and each inner peripheral lip may be arranged so as to partially overlap in the front-rear direction.

DESCRIPTION OF SYMBOLS 10 ... Rubber plug 11 ... Rubber plug main body 16 ... Outer peripheral lip 17 ... Electric wire insertion hole 18 ... Inner peripheral lip 21 ... Inner / outer seal corresponding lip 22 ... Extension part 23 ... Seal main body part 60 ... Terminal metal fitting 80 ... Connector housing 81 ... Cavity 82 ... Invitation edge 90 ... Electric wire

Claims (3)

A rubber plug that is inserted into the cavity of the connector housing from the rear and elastically adheres to the inner peripheral surface of the cavity to keep the inside of the cavity liquid-tight,
A rubber stopper body,
Continuing to the rear end portion of the rubber plug main body, it is possible to elastically contact with the connector housing, and the contact position with respect to the connector housing is changed from the rear end portion of the inner peripheral surface of the cavity to the rear surface of the connector housing. A rubber plug comprising: an inner / outer seal-compatible lip that can be changed to the inside / outside of the cavity around an opening of the cavity.   The lip corresponding to the inner and outer seals is in a natural state before being elastically deformed, and extends at least forward in an extension portion extending so as to protrude outward from the rear end portion of the rubber plug main body, and on the front end side of the extension portion. The rubber plug according to claim 1, further comprising a seal body portion that protrudes and can be brought into close contact with the connector housing.   An electric wire insertion hole is formed in the rubber plug main body so as to penetrate in the front-rear direction, and the rubber plug main body is elastically formed on the outer peripheral surface in front of the lip corresponding to the inner and outer seals and on the inner peripheral surface of the cavity. An outer peripheral lip that can be closely attached is provided around the inner peripheral surface of the wire insertion hole of the rubber plug body, and an inner peripheral lip that can be elastically attached to the outer peripheral surface of the electric wire is provided around the inner peripheral lip. The rubber stopper according to claim 1 or 2, wherein the rubber stopper is disposed in front of the outer peripheral lip.

Images