JP2010054013A - Packing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular rubber packing having simple construction surely preventing the reversing of a lip while solving the problem wherein the lip is turned and reversed in the opposite direction to a predetermined direction in the process of mounting the annular rubber packing with the lip between a first member and a second member. <P>SOLUTION: The annular rubber packing comprises a packing base, and the lip obliquely rising up from the packing base. It is mounted between the first member and the second member in the state that the lip falls down. In an area adjacent to the front end of the lip, a protruded portion is formed which abuts on the first member together with the front end of the lip to prevent the reverse of the lip in the packing mounting process. The reverse preventing protruded portion greatly reduces a risk of imparting sealing performance, resulting in easy mounting work for the packing. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an annular rubber packing having a lip, and more particularly to an annular rubber packing used in a state where the lip is tilted between two members.

  FIG. 4 shows a configuration of a conventional annular packing used in a state where the lip is tilted between two members. The annular packing 30 includes an annular packing base 12 and an annular lip 14 that rises from the packing base (see, for example, Patent Document 1).

  When mounting the annular packing 30 between the upper member (first member) 20 and the lower member (second member) 22, first, the packing 30 is disposed in the concave groove 24 provided in the lower member 22, Next, the upper member 20 is fixed on the lower member 22. When the packing 30 is mounted between the members 20 and 22, the lip 14 is further tilted or bent in the lip inclination direction.

However, in the packing mounting process, when the upper member 20 is put on the lower member 22, a movement in the lateral direction (shown as A in FIG. 4) intersects with the covering direction (shown as A in FIG. 4). The lip 14 may be dragged and turned over so as to be turned to the opposite side (indicated by a one-dot chain line in FIG. 4). If the packing is attached as it is, the sealing performance may be greatly impaired. It was.
JP 2002-98274 A

  The present invention solves the above-mentioned problems that occur in the conventional annular packing, and it is possible to reliably prevent the lip from being mounted in an inverted state by turning in the direction opposite to the predetermined direction during the mounting process. An object of the present invention is to provide a rubber packing.

  In order to achieve the above object, the annular rubber packing of the present invention comprises a packing base and a lip that rises so as to incline from the packing base, and the first member and the second member in a state in which the lip is tilted. A ring-shaped rubber packing that is mounted between the lip and the portion adjacent to the tip of the lip so as to prevent reversal of the lip by contacting the first member together with the tip of the lip during the packing mounting process. It is characterized in that a part is formed.

  Further, the protrusion for preventing the reversal of the packing of the present invention may be configured to be separated from the first member in the packing mounted state.

  In the present invention, the protrusion adjacent to the tip of the lip is formed with a protrusion that prevents the lip from reversing by contacting the first member together with the tip of the lip in the packing attachment process. In this case, even when the movement of the first member in the lateral direction (B) intersecting the covering direction (A) is applied, the inversion of the lip is prevented by the projecting portion coming into contact with the first member and stretching. Stable sealing performance is ensured. In addition, conventionally, when the first member is put on, it has been necessary to work carefully so as not to add the movement in the lateral direction (B). Work has become much easier.

  Further, by adopting a configuration in which the protrusion for preventing reversal is separated from the first member when the packing is attached, the protrusion for preventing reversal does not adversely affect the sealing performance.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  FIG. 1 is a sectional view of an annular rubber packing according to an embodiment of the present invention. The annular rubber packing 10 includes an annular packing base 12 and an annular lip that rises in the axial direction (in the direction of the central axis X in FIG. 1) so as to incline inward (inner peripheral side) from the packing base. 14. The packing base 12 is a fixed part that does not move during the mounting process, and a flat surface is formed at the axial end of the packing base 12. Since the lip 14 is in a tilted state or a bent state when mounted, a portion that is easily bent by changing the thickness is formed on the inner peripheral surface of the lip over the entire circumference. In this packing, an inversion-preventing protrusion 18 is formed adjacent to the inside of the lip tip 16.

  The protrusion 18 for preventing inversion may be formed continuously over the entire circumference of the packing 10 or may be formed intermittently.

  The tip portion of the lip 14 is formed in a bifurcated cross-sectional shape by the lip tip portion 16 and the inversion-preventing protrusion 18 (see also FIG. 2). The cross-sectional shape of the tip portion of the lip 14 may be a cross-sectional shape such as a wave shape having two or more convex portions, a sawtooth shape, a triangular wave shape, or a trifurcated shape, in addition to the bifurcated shape. However, it has been confirmed by experiments that the tip portion of the lip 14 is simply formed flat and the contact area is increased, which is not effective in preventing reversal, and that the cross-sectional shape such as a bifurcated shape is excellent in preventing reversal. . The tip of the lip tip 16 and the tip 18 for preventing reversal may be squared or rounded.

  The tip of the lip 16 and the protrusion 18 for preventing reversal preferably have the same height in the axial direction. However, when the lip is about to be reversed, the protrusion 18 abuts against the upper member and stretches. It may not be the same as long as it can be demonstrated. The packing can be molded using any type of rubber depending on the application. Besides rubber, a flexible material such as plastic can also be used. The packing is molded by a conventional method well known to those skilled in the art.

  2 and 3 are cross-sectional views showing the mounting process of the annular rubber packing. FIG. 2 shows a state where the upper member 20 is going to be covered with the lower member 22 after the packing 10 is disposed in the concave groove 24 of the lower member 22. The lip tip portion 16 and the inversion preventing projection 18 are in contact with the upper member 20.

  Since the protrusion 18 for preventing reversal is provided adjacent to the inner peripheral side of the lip tip 16, the covering direction (direction A in FIG. 2) of the upper member 20 in the packing mounting process shown in FIG. Even when a crossing lateral direction (direction B in FIG. 2) is applied, the protrusion 18 is brought into contact with the upper member 20 together with the lip tip 16 so that the lip is prevented from being reversed. .

  FIG. 3 shows a state in which the upper member 20 is further moved in the direction A from the state of FIG. As shown in FIG. 3, in a state where the packing is completely attached, the lip 14 is greatly tilted and comes into contact with the upper member 20 in a wide area, thereby ensuring a stable sealing property. In this state, the protrusion 18 is separated from the upper member 20 and does not affect the sealing performance.

  Although FIGS. 1-3 showed the packing of the shape where the lip 14 inclined toward the inner side, this invention is applicable also to the packing of the shape where the lip is inclined toward the outer side. In this case, the protrusion for preventing inversion is formed adjacent to the outside of the lip tip.

It is sectional drawing of the annular packing as one Embodiment of this invention. It is sectional drawing which shows the mounting process of the annular packing of FIG. It is sectional drawing which shows the mounting state of the annular packing of FIG. It is sectional drawing which shows the mounting process of the conventional annular packing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Annular packing 12 Packing base | substrate 14 Lip | rip 16 Lip front-end | tip part 18 Protrusion for inversion prevention 20 Upper member 22 Lower member 24 Concave groove

Claims (2)

  An annular rubber packing comprising a packing base and a lip that rises so as to incline from the packing base, and is mounted between the first member and the second member when the lip is tilted, The packing is characterized in that a protrusion that prevents the lip from reversing by being in contact with the first member together with the tip of the lip in the packing mounting process is formed in a portion adjacent to the tip of the lip.   The packing according to claim 1, wherein the protrusion is separated from the first member when the packing is mounted.