JP5949565B2 - Waterproof connector - Google Patents

Description

  The present invention relates to a waterproof connector provided with a seal ring.

  Conventionally, the thing of the following patent document 1 is known as an example of the waterproof connector fitted and attached to the attachment hole provided in the other party member. This is a housing having an elliptical fitting part (which is also treated as a kind of elliptical shape) that fits into a mounting hole, and an ellipse that is fitted in a fitting groove formed on the outer peripheral surface of the fitting part. And a ring-shaped seal ring. Since such an elliptical seal ring needs to be mounted in a fixed mounting position (rotating position) with respect to the mounting groove, a protruding piece projecting sideways is formed on the side edge of the seal ring. On the other hand, a recess in which the projecting piece is fitted is formed in the side wall of the mounting groove, and by positioning the projecting piece in the recess, the positioning for determining the rotation posture of the seal ring and the seal ring is surrounded. It plays a function to prevent movement in the direction.

JP 2010-123329 A

By the way, since the seal ring is made of soft rubber, for example, if the waterproof connector is picked up by holding the seal ring with the thumb and forefinger to attach to the mating member, the seal ring may be deformed and lifted from the mounting groove. is there. In particular, when the oval short side of the seal ring is picked, the long side is easily lifted and deformed. In such a case, the protruding piece may come out of the recess and the seal ring may move in the circumferential direction. If this is overlooked and the fitting part of the housing is fitted into the mating mounting hole, the seal ring will be fitted in a distorted form, and the seal function may not be performed, and in some cases the seal ring There is a risk of causing damage, and countermeasures have been demanded.
The present invention has been completed based on the above circumstances, and an object thereof is to prevent the seal ring from moving in the circumferential direction.

The present invention relates to a waterproof connector fitted and attached to a mounting hole provided in a mating member, and a housing having an elliptical fitting part that fits into the mounting hole, and an outer peripheral surface of the fitting part A mounting groove that is recessed along the circumferential direction and includes a groove bottom and a pair of side walls provided on both sides of the groove bottom, and an inner surface that is in close contact with the groove bottom of the mounting groove over the entire circumference. has a circumferential lip, the mounting groove and an annular sealing ring forming the ellipse is fitted provided, on the side wall of the short sides of the mounting groove, the side edges of the short sides of the seal ring wherein there is formed a pressing portion for pressing towards the groove bottom and the pressing portion, in the central portion in the length direction of the short sides of the mounting groove, each other from the position of the opening end side of both sides of the side walls A pair is formed in a face-to-face configuration, Both side edges of the short sides of the ring, each having a characteristic at where the structure is pressed to the groove bottom side by a pair of the pressing portion.
As for the ellipse, it is assumed that the long side of the ellipse is a straight line and the short side is a semicircle, and is included in one type of ellipse.

When the seal ring is fitted into the mounting groove, the side edge of the short side portion is also pressed by the pressing portion. Especially when the short side is picked from both sides, the long side part swells and deforms relatively easily and disengages from the mounting groove, and when the rotational force is applied following the picked state, the seal ring moves in the circumferential direction. May move.
However, in the present invention, at the picked position such as the short side of the seal ring or in the vicinity thereof, the side edge is pressed by the pressing portion and the inner surface is pressed against the groove bottom of the mounting groove. The seal ring is prevented from moving in the circumferential direction. If the holding part has a structure in which the long side of the seal ring is pressed, the position where the seal ring is picked is not limited to move and may remain in a deformed state between the pressed part. However, since the short side portion is pressed, the picked portion of the seal ring is surely prevented from moving, and the seal ring is maintained in a regular shape and fitted in the mounting groove. .

Both side edges of the short sides of the sheet Ruringu are detent by being inserted in a crushed form to the lower surface side of the pressing portion.
The pressing portion can be formed by a molding die that opens and closes along the minor axis direction of the fitting portion of the housing in order to form the mounting groove. The molding die can be kept on a simple one.

  According to the waterproof connector of the present invention, the seal ring can be prevented from moving in the circumferential direction.

The perspective view of the waterproof connector which concerns on one Embodiment of this invention Plan view Front view Same left side view Sectional view taken along line V-V in FIG. Sectional view taken along line VI-VI in FIG. Top view of housing with seal ring Same left side view IX-IX sectional view of FIG. Partial enlarged view of FIG.

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 6, the waterproof connector C of the present embodiment is attached and fixed to a case 60 of a device mounted on a vehicle. The waterproof connector C includes a housing 10 having a fitting portion 11 that fits into a mounting hole 61 formed so as to penetrate the case 60, and a waterproof connector C that is held inside the housing 10 and protrudes toward the inside of the case 60. A male terminal 30 of the book, a shield shell 40 that is bolted to the case 60 so as to cover a portion of the housing 10 that protrudes from the mounting hole 61 to the outside of the case 60, and the like are provided.

  The housing 10 is made of synthetic resin, and as shown in FIG. 5, three cavities 12 shown in the figure extending in the front-rear direction are formed side by side in the left-right direction. A lance 13 is provided at a position near the front end (right side in the figure) of the ceiling wall of each cavity 12 so as to be able to be deflected.

  The male terminal 30 is a connecting portion 31 having a tab-like front part, and a barrel 32 that is crimped to the core of the electric wire W is provided in the latter part. The electric wire W is drawn backward from the barrel 32, and an individual rubber plug 33 is fitted on the outer periphery of the drawn portion. The rubber plug 33 is sandwiched between the outer peripheral surface of the electric wire W and the inner peripheral surface of the cavity 12 and functions to prevent water from entering from the rear of the cavity 12. Each rubber plug 33 is retained in the cavity 12 by a common back retainer 34.

  The shield shell 40 is formed by pressing a metal plate material such as iron or aluminum. The shield shell 40 includes a horizontally long tubular portion 41 that covers a rear portion of the housing 10 relative to the fitting portion 11, and an attachment portion 42 that projects from the front edge of the tubular portion 41 to the outer peripheral side. Yes. A caulking ring 43 is attached to the outer periphery of the tubular portion 41. A braided wire (not shown) is disposed between the tubular portion 41 and the caulking ring 43, and the caulking ring 43 is caulked so that the braided wire and the tubular portion 41 are connected in a conductive manner. . This braided wire is configured to collectively cover a plurality of electric wires W.

  As shown in FIG. 3, a pair of left and right bolt insertion holes 45 are formed through the attachment portion 42. The shield shell 40 is fixed to the case 60 by inserting a bolt (not shown) through the bolt insertion hole 45 and tightening it into a screw hole (not shown) formed in the case 60. Further, as shown in FIG. 5, the rearward movement of the housing 10 is restricted by the rear surface of the fitting portion 11 being locked by the front surface of the mounting portion 42. Furthermore, the forward movement of the housing 10 is restricted by the plurality of holding projections 14 projecting from the upper and lower surfaces of the rear end portion of the housing 10 being locked at the rear end of the tubular portion 41. That is, as the shield shell 40 is fixed to the case 60, the housing 10 held by the shield shell 40 is also fixed to the case 60.

A rubber seal ring 50 containing oil is mounted on the outer peripheral surface of the fitting portion 11 of the housing 10.
The fitting portion 11 is formed in a horizontally long oval shape so that the fitting portion 11 is fitted and fitted in the mounting hole 61 of the case 60. On the outer peripheral surface of the fitting portion 11, a mounting groove 20 for tightly fitting the seal ring 50 is recessed over the entire circumference with a predetermined depth.

The seal ring 50 is formed in an annular shape having an oblong shape corresponding to the shape of the fitting portion 11 and the mounting groove 20 described above. Two outer peripheral lips 51 are provided on the outer peripheral surface of the seal ring 50, and three inner peripheral lips 52 are provided on the inner peripheral surface.
Since the seal ring 50 is formed in an elliptical shape as described above, when the seal ring 50 is fitted into the mounting groove 20, it is necessary to make the mounting posture (rotating posture) with respect to the mounting groove 20 constant. .

  Therefore, positioning protrusions 55 are formed on both side edges 53 of the seal ring 50 so as to protrude sideways. Specifically, as shown in FIG. 2, the protruding pieces 55 are formed in a form in which a pair protrudes from both side edges 53 toward the back at the same place in the circumferential direction of the seal ring 50. With the protruding pieces 55 as a set, each set of protruding pieces 55 is provided at two locations on the upper and lower long side portions 50 </ b> L of the seal ring 50.

  On the other hand, in the both side walls 21 of the mounting groove 20, the recesses 22 into which the above-described protruding pieces 55 are fitted are notched and formed in an open shape on the outer peripheral surface. Specifically, the recesses 22 are formed in a form in which a pair of the recesses 22 face each other at the same place in the circumferential direction of the mounting groove 20. Two upper and lower long side portions 20L are provided at two locations.

Therefore, by fitting each projecting piece 55 formed on the seal ring 50 into the corresponding recess 22, the seal ring 50 is positioned and mounted in the correct posture with respect to the mounting groove 20.
When the fitting portion 11 of the housing 10 to which the seal ring 50 is fitted is fitted into the mounting hole 61 of the case 60, the outer peripheral lip 51 is placed around the inner peripheral surface of the mounting hole 61 as shown in FIG. The inner peripheral lip 52 is in close contact with the groove bottom of the mounting groove 20 over the entire circumference, so that the case 60 is provided between the inner peripheral surface of the mounting hole 61 and the outer peripheral surface of the fitting portion 11. It functions to prevent water from entering inside.

In the present embodiment, means for preventing the seal ring 50 mounted in the mounting groove 20 from rotating is provided. That is, both side walls 21 of the mounting groove 20 formed in the fitting portion 11 of the housing 10, in detail, as shown in FIGS. 8 and 9, the lengthwise center portions of both short sides 20 </ b> S of the mounting groove 20. A pair of pressing portions 25 that press both side edges 53 of the short side portion 50S of the seal ring 50 are formed (positions corresponding to both ends of the long axis of the ellipse constituting the mounting groove 20).
As shown in detail in FIG. 10, the pair of pressing portions 25 are formed so as to protrude from the positions on the opening end sides of the both side walls 21 of the short side portion 20 </ b> S of the mounting groove 20.

The present embodiment is configured as described above, and its operation and effects will be described subsequently.
When the seal ring 50 is mounted in the mounting groove 20, the seal ring 50 is fitted into the mounting groove 20 while the projecting piece 55 is fitted in the corresponding recess 22. ) And mounted in the mounting groove 20. At the same time, as shown in FIG. 10, both side edges 53 of the short side portion 50 </ b> S of the seal ring 50 are press-fitted into the lower surface side of the corresponding pressing portion 25. As a result, both side edges 53 of the seal ring 50 are pressed by the pressing portion 25 at the center in the length direction of the short side portions 50S, and the inner peripheral lip 52 of the seal ring 50 is accordingly groove bottom of the mounting groove 20. It will be in a state of being pressed while being compressed.

  Thus, the waterproof connector C in which the seal ring 50 is attached to the fitting portion 11 of the housing 10 is attached by fitting the fitting portion 11 of the housing 10 into the attachment hole 61 of the case 60. When the waterproof connector C is picked up by gripping the seal ring 50 with the index finger, especially when both the short side portions 50S of the seal ring 50 are picked, the long side portion 50L swells and deforms relatively easily, and the projecting piece 55 is recessed. If the rotative force is applied following the picked state, the seal ring 50 may move in the circumferential direction.

However, in this embodiment, at the picked position such as the center of the short side portion 50S of the seal ring 50 or in the vicinity thereof, both side edges 53 are pressed by the pressing portion 25, and the inner surface (inner lip 52) of the seal ring 50 is pressed. Since it is pressed against the groove bottom of the mounting groove 20, the seal ring 50 is prevented from moving in the circumferential direction due to the frictional resistance therebetween. If the holding portion has a structure in which the long side portion 50L side of the seal ring 50 is pressed, the position where the seal ring 50 is picked is not limited to move and is held in a deformed state between the pressed portion. Although there is a possibility that the short side portion 50S is pressed, it is reliably prevented that the portion where the seal ring 50 is picked is moved, and the seal ring 50 is fitted into the mounting groove 20 in a regular shape. Maintained in the form.
Therefore, when the fitting portion 11 of the housing 10 is fitted into the mounting hole 61, the seal ring 50 extends over the entire circumference of the inner peripheral surface of the mounting hole 61 of the case 60 and the groove bottom of the mounting groove 20. It is elastically compressed between the two so that the seal can be surely taken.

  Further, the pair of pressing portions 25 are formed in a form facing each other from the positions on the opening end sides of the side walls 21 on both sides in the central portion in the length direction of the short side portion 20S of the mounting groove 20. Therefore, the pressing portion 25 can be formed by a molding die that opens and closes along the minor axis direction of the fitting portion 11 of the housing 10 in order to mold the mounting groove 20. The molding die can be kept on a simple one, which can contribute to reducing the manufacturing cost.

<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) The pair of pressing portions may be formed in an arrangement shifted in the length direction at the short side portion of the mounting groove. It becomes easy to press-fit the side edge of the seal ring into the lower surface of the pressing portion .
( 3) The pressing portion may be formed on only one of the short side portions of the mounting groove.
(4) The number of detents (positioning) consisting of protrusions and recesses provided on the long sides of the seal ring and the mounting groove is not limited to two each illustrated in the above embodiment, but any number. May be. Further, the present invention can be similarly applied to the seal ring and the long side portion of the mounting groove where no detent portion is set.

C ... Waterproof connector 10 ... Housing 11 ... Fitting part 20 ... Mounting groove 20S ... Short side part 21 ... Side wall 22 ... Recess 25 ... Holding part 50 ... Seal ring 50S ... Short side part 53 ... Side edge 55 ... Projection part 60 ... Case (mating member)
61 ... Mounting hole

Claims (1)

A waterproof connector fitted and attached to a mounting hole provided in a mating member,
A housing having an elliptical fitting portion that fits into the mounting hole;
A mounting groove formed by a groove bottom and a pair of side walls provided on both sides of the groove bottom, recessed along the circumferential direction on the outer peripheral surface of the fitting portion;
An inner peripheral lip that adheres to the groove bottom of the mounting groove over the entire circumference, and an elliptical ring-shaped seal ring that is fitted into the mounting groove; and
Wherein the side wall of the short side portion of the mounting groove, and pressing unit for pressing the side edges of the short sides towards the groove bottom is formed of the seal ring,
The pressing part is formed in a pair in a form facing each other from the position of the opening end side of the side wall on both sides in the central part in the length direction of the short side part of the mounting groove, A waterproof connector characterized in that both side edges of the short side portion are respectively pressed against the groove bottom side by a pair of the pressing portions .

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