JP2015050830A - Grommet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure reliable waterproofness by eliminating a gap between a connector housing when fastening a fastener member.SOLUTION: A grommet 1 being attached to the outer peripheral surface 4a of a connector housing 4 has a low friction part 1ab formed at a band attachment part 1a where a binding band 6 of the outer surface 1aa on the tip side is attached. Since friction of the grommet 1 and binding band 6 is suppressed when the binding band 6 is fastened, and the binding band 6 fastens the grommet 1 while slipping, the grommet 1 is not biased and deformed, and a part of which is not separated from the outer peripheral surface 4a of a connector housing 4 while floating, thus ensuring reliable waterproofness.

Description

  The present invention relates to a grommet that is attached to a connector housing, and relates to a grommet that prevents generation of a gap between the grommet and the connector housing when tightened by a fastening member.

  2. Description of the Related Art Conventionally, there has been known a shield connector in which a grommet is attached to a connector housing to prevent moisture from entering between them (see, for example, Patent Document 1 below). In this shielded connector, the thickness of the portion corresponding to the concave warped portion generated on the outer peripheral surface of the connector housing of the grommet to be pressed between the connector housing and the fastening member is larger than that of the other portions. It is configured to be thick. Thereby, the clearance gap between the outer peripheral surface of a connector housing and a grommet is eliminated, and the penetration | invasion of the water | moisture content from this clearance gap is prevented.

JP 2007-87874 A

  However, in the conventional shielded connector disclosed in Patent Document 1, the outer surface of the pressure-clamped portion of the grommet and the contact surface with the pressure-clamped portion of the fastening member are generally flat surfaces, respectively. Therefore, when the clamped portion is fastened with the fastening member, the flat surfaces are pulled in the direction of the fastening portion of the fastening member while being in close contact with each other due to friction between the grommet and the fastening member.

  In this case, the sandwiched pressure portion of the grommet is deformed in a biased manner and a part of the grommet is separated from the outer peripheral surface of the connector housing so that a gap is generated between the connector housing and the grommet, resulting in waterproofness. May be damaged.

  The present invention provides a grommet that eliminates the above-described problems caused by the prior art and can ensure a reliable waterproof property without causing a gap between the connector housing when the fastening member is tightened. Objective.

  The grommet according to the present invention is a grommet attached to the outer peripheral surface of the connector housing, and is characterized in that a low friction portion is formed in a portion where a fastening member on the outer surface on the front end side is mounted.

  According to the grommet according to the present invention, since the low friction portion is formed in the portion where the fastening member on the outer surface on the tip side is mounted, the friction between the grommet and the fastening member is suppressed when the fastening member is tightened. In addition, since the grommet is tightened while the fastening member slides, the grommet is biased and deformed, and a part of the grommet does not separate from the outer peripheral surface of the connector housing. For this reason, reliable waterproofness can be ensured.

  In one embodiment of the present invention, the low friction part is an uneven surface formed on at least a part of the outer surface.

  In another embodiment of the present invention, the low friction part is a part where a predetermined paint is applied to at least a part of the outer surface.

  In still another embodiment of the present invention, the low friction portion is formed on at least a curved surface portion of the outer surface.

  According to the present invention, when the fastening member is tightened, there is no gap between the connector housing and reliable waterproofness can be ensured.

It is a disassembled perspective view which shows the waterproof connector provided with the grommet which concerns on one Embodiment of this invention. It is sectional drawing of the waterproof connector. It is sectional drawing of the band mounting part of the grommet of the waterproof connector. It is sectional drawing of the band mounting part of the grommet of the waterproof connector. It is sectional drawing which shows the variation of the formation location of the low friction part in a band mounting part. It is sectional drawing which shows the variation of the formation location of the low friction part in a band mounting part. It is sectional drawing which shows the variation of the formation location of the low friction part in a band mounting part. It is sectional drawing which shows the variation of the formation location of the low friction part in a band mounting part. It is sectional drawing which shows the variation of the formation location of the low friction part in a band mounting part.

  Hereinafter, a grommet according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an exploded perspective view showing a waterproof connector provided with a grommet according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the waterproof connector. 3 and 4 are cross-sectional views of the band mounting portion of the grommet of the waterproof connector. As shown in FIGS. 1 and 2, the waterproof connector 5 including the grommet 1 according to the present embodiment accommodates a wire harness 2 and a connection terminal 3 attached to the wire harness 2 in addition to the grommet 1. And a connector housing 4 made of a resin molded member.

  The grommet 1 is made of, for example, an elastic material such as rubber or elastomer, and the distal end side and the proximal end side are the outer peripheral surface 4a (see FIG. 3 and the like) on the rear side (proximal end side) of the connector housing 4 and the distal end side of the wire harness 2, respectively. Attached to the (terminal side) surface. The grommet 1 covers the terminal portion of the wire harness 2 while closing an opening portion of a terminal portion accommodation hole (not shown) that accommodates the terminal portion of the wire harness 2 provided on the proximal end side of the connector housing 4. Thus, it plays a role of a waterproof seal of the waterproof connector 5.

  On the front end side of the grommet 1, a band mounting portion 1a to which a binding band 6 as a fastening member is mounted is formed on the outer surface 1aa. A low friction portion 1ab for reducing friction with the inner peripheral surface 6a of the binding band 6 is formed on at least a part of the outer surface 1aa of the band mounting portion 1a. The low friction part 1ab will be described later.

  On the other hand, an end 1b that is fastened to a part of the wire harness 2 by winding (not shown) such as another binding band or an adhesive tape is formed on the proximal end side of the grommet 1. And the grommet 1 is further provided with the bellows part 1c which connects between the band mounting part 1a mentioned above and the edge part 1b, and covers and protects the terminal part of the wire harness 2.

  The wire harness 2 has a structure having, for example, a braided shield member 8 surrounding a plurality of covered electric wires 7. A shield shell 9 made of a metal member is built in the connector housing 4. The wire harness 2 has the respective covered electric wires 7 in a state of being bundled at the center, and is arranged so as to surround the braided shield member 8 on the outer peripheral side thereof, and further the outer peripheral side of the braided shield member 8 is covered with the covering member 2a. It consists of a structure covered with.

  The braided shield member 8 has, for example, a structure in which a plurality of thin shield wires are knitted, and is configured to include a reinforcing intermediate material (not shown) such as vinyl for preventing loss of shape from the knitted state. Yes. For example, a retainer 40 that holds each covered electric wire 7 and an inner ferrule 50 that is fitted with the braided shield member 8 sandwiched between the retainer 40 and the inner ferrule 50 are attached to the terminal portion of the wire harness 2. And ferrules made of a metal member such as an outer ferrule 60 fitted with the braided shield member 8 sandwiched therebetween. On the distal end side of the retainer 40, a plurality of ring-shaped rubber parts 80 each having a hole 81 for sealing each covered electric wire 7 in a tight contact state are provided.

  The connection terminal 3 is, for example, a known crimp type terminal, and includes a connection portion 3a directly connected to a connection counterpart connection terminal (not shown), a crimp portion 3b to which the core wire 7a of the covered wire 7 is crimped, and the covered wire 7. A presser portion 3c that presses against the connection terminal 3 is provided. And the connection terminal 3 is attached to the front-end | tip of the core wire 7a of each covered electric wire 7 by crimping.

  As shown in FIG. 2, the connector housing 4 includes, for example, a terminal housing hole 11 that houses each covered wire 7 and the connection terminal 3 therein, and a terminal portion of the wire harness 2 that is formed on the rear side of the terminal housing hole 11. The terminal part accommodation hole 12 which accommodates is provided. The connector housing 4 includes a fitting hole 13 into which a mating connector housing (not shown) formed on the front side of the terminal receiving hole 11 is fitted, and the same inner surface as the fitting hole 13 and the terminal receiving hole 11. And a shield shell housing hole 14 for housing the shield shell 9 formed at the level.

  Further, the connector housing 4 is formed in an annular shape on the outer peripheral side of the fitting hole 13, and engages with a peripheral wall fitting portion 15 into which a peripheral wall of the counterpart connector housing is fitted, and a lock piece provided in the counterpart connector housing. And a lock portion 16 that locks and holds the fitting state between the connector housings.

  In addition, the front end side of the fitting hole 13 of the connector housing 4 is formed to have a large diameter via a stepped portion, and a housing seal 17 formed, for example, in an annular shape is inserted and attached in the peripheral wall fitting portion 15. . The shield shell 9 is made of, for example, a metal member formed in a cylindrical shape that can be inserted into the shield shell accommodation hole 14.

  The low friction part 1ab formed in the outer surface 1aa of the band mounting part 1a of the grommet 1 is configured as follows, for example. First, as described above, as shown in FIG. 3, the band mounting portion 1a of the grommet 1 is connected to the outer peripheral surface 4a on the proximal end side of the connector housing 4 into which the covered electric wire 7 having the core wire 7a is inserted. It is covered and attached so that the peripheral surface 1d is in close contact.

  The low friction part 1ab is constituted by an uneven surface formed by processing such as embossing or satin processing over the entire outer surface 1aa of the band mounting part 1a attached in this way (entire circumference, entire surface). . Then, the binding band 6 is mounted so that the inner peripheral surface 6a is in contact with the outer surface 1aa of the band mounting portion 1a formed with the low friction portion 1ab as a whole.

  In the waterproof connector 5 to which the grommet 1 is attached, even if the binding band 6 is tightened with the binding band 6 attached to the band mounting portion 1a as described above, the outer surface 1aa of the band mounting portion 1a is tightened. Since the low friction part 1ab is formed, the friction between the grommet 1 and the binding band 6 is suppressed.

  That is, when the binding band 6 is tightened, the grommet 1 is tightened while the outer surface 1aa of the band mounting portion 1a and the inner peripheral surface 6a of the binding band 6 slide sufficiently, so that the grommet 1 is biased as in the prior art. Therefore, the inner peripheral surface 1d of the band mounting portion 1a of the grommet 1 can be prevented from being lifted away from the outer peripheral surface 4a of the connector housing 4. Thereby, if the grommet 1 which concerns on this embodiment is used, it will become possible to ensure the reliable waterproofness of the waterproof connector 5. FIG.

  In addition, the low friction part 1ab is constituted by the uneven surface as described above, and, as shown in FIG. 4, for example, a predetermined friction coefficient such as Teflon (registered trademark), silicone, or urethane can be kept low. The coating material may be applied over the entire outer surface 1aa. Thus, even if the low friction portion 1ab is constituted by a predetermined paint, the grommet 1 can be tightened while the binding band 6 (not shown) slides, so that the same effect as described above can be obtained.

  The low friction portion 1ab is formed over the entire outer surface 1aa of the band mounting portion 1a. However, the low friction portion 1ab is a portion constituting at least a curved surface of the outer surface 1aa of the band mounting portion 1a. It suffices if it is formed. 5-9 is sectional drawing which shows the variation of the formation location of the low friction part 1ab in the band mounting part 1a. 5 to 9, the difference between the outer surface 1aa and the low friction portion 1ab is not shown, and is indicated by the same line.

  As shown in FIG. 5, for example, when the outer peripheral surface 4 a on the proximal end side of the connector housing 4 and the outer surface 1 aa of the band mounting portion 1 a are formed in an elliptical shape with a part of a straight line when viewed in cross section. The low friction portion 1ab may be formed at least in the range of the curved surface portion 20A in the outer surface 1aa.

  As shown in FIG. 6, for example, when the outer peripheral surface 4a on the base end side of the connector housing 4 and the outer surface 1aa of the band mounting portion 1a are formed in a rounded rectangular shape when viewed in cross section, Friction part 1ab should just be formed in the range of at least curved-surface part 20B of outer surface 1aa.

  Similarly, when the outer peripheral surface 4a and the outer surface 1aa as shown in FIG. 7 are all formed in an elliptical shape composed of curves, the outer peripheral surface 4a and the outer surface 1aa as shown in FIG. Even when the outer peripheral surface 4a and the outer surface 1aa as shown in FIG. 9 are formed in a rounded triangular shape (rice ball shape) as shown in FIG. 9, the low friction part 1ab is included in the outer surface 1aa. As long as it is formed in the range of at least the curved surface portions 20C, 20D, and 20E.

  The range of these curved surface portions 20A to 20E may be a portion having the largest curvature with respect to the entire outer surface 1aa. By forming the low friction portion 1ab in the range of the curved surface portions 20A to 20E, not only the above-described effects can be obtained, but also the mold cost can be suppressed as compared with the overall formation, and the binding band 6 It becomes possible to reduce the friction of the place where friction with this becomes large.

DESCRIPTION OF SYMBOLS 1 Grommet 1a Band mounting part 1aa Outer surface 1ab Low friction part 1b End part 1c Bellows part 1d Inner peripheral surface 2 Wire harness 2a Cover member 3 Connection terminal 3a Connection part 3b Crimp part 3c Holding part 4 Connector housing 4a Outer peripheral surface 5 Waterproof connector 6 Binding band 6a Inner peripheral surface 7 Covered wire 7a Core wire 8 Braided shield member 9 Shield shell

Claims (4)

A grommet attached to the outer peripheral surface of the connector housing,
A grommet characterized in that a low friction portion is formed in a portion where the fastening member on the outer surface on the front end side is mounted. The grommet according to claim 1, wherein the low friction part is an uneven surface formed on at least a part of the outer surface. The grommet according to claim 1, wherein the low friction part is a part where a predetermined paint is applied to at least a part of the outer surface. The grommet according to any one of claims 1 to 3, wherein the low friction portion is formed on at least a curved surface portion of the outer surface.

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