JP2002364758A - Packing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packing for preventing the local wear of an inner periphery lip. SOLUTION: The packing comprises a circular packing body 1, the inner periphery lip 2 and an outer periphery lip 3 protruded axially from one side face of the packing body 1 in radially separated relation, and a plurality of connection ribs 4 formed on the packing body 1 in circumferentially spaced relation so that inside faces 2a, 3a of the inner periphery lip 2 and the outer periphery lip 3 are connected to each other. The plurality of connection ribs 4 extend in almost the same tangential direction to the inside face 2a of the inner periphery lip 2 and have heights not exceeding outer end faces 2b, 3b of the inner and outer periphery lips 2, 3. The pressure receiving area of an outside face 401 of the connection rib 4 is equal to that of an inside face 400.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in packing.

[0002]

2. Description of the Related Art Conventionally, a packing known from FIG. 3 (corresponding to Japanese Patent Publication No. 5-588) has an annular packing body 31.
And an inner peripheral lip 3 formed on one side surface 31a of the packing body 31 so as to protrude in the axial direction and spaced apart in the radial direction.
2 and an outer peripheral lip 33; and a plurality of connecting ribs 34 formed on the packing body 31 so as to be connected to the inner side surfaces 32a, 33a of the inner peripheral lip 32 and the outer peripheral lip 33 and spaced apart in the circumferential direction. And the plurality of connecting ribs 3
4 extends substantially tangentially in the same direction to the inner side surface 32a of the inner peripheral lip 32 and has a height not exceeding the outer end surfaces of the inner and outer peripheral lips 32, 33. An intermediate rib 35 extending circumferentially and having a height not exceeding the outer end surfaces of the inner and outer lips 32, 33 is formed on the packing body 31, and the connecting rib 34 is divided in the radial direction by the intermediate rib 35. Have been. And
The lower split connecting rib 3 on the side connected to the inner peripheral lip 32 among the split upper and lower split connecting ribs 34b, 34a
The length L3 of the outer surface 341 of 4a is the length L of the inner surface 340.
4 so that the pressure-receiving area of the outer surface 341 is larger than the pressure-receiving area of the inner surface 340.

[0003]

In the conventional packing described above, the divided upper and lower connecting ribs 34 are divided.
The outer surface length L3 of the lower divided connecting rib 34a on the side connected to the inner peripheral lip 32 is the inner surface length L4.
And the pressure receiving area of the outer side surface 341 is made larger than the pressure receiving area of the inner side surface 340, so that when the hydraulic pressure is applied to the packing, the lower split connecting rib 34a is moved from the outer side surface 341 having a larger pressure receiving area to the pressure receiving area. Small inner surface 34
Pressure acts on zero. As a result, the lower split connecting rib 3
The inner surface 340 of the inner peripheral lip 32 may be pressed by a mating member that comes into contact with the inner peripheral lip 32, and the inner peripheral lip 32 may be locally worn. When the inner peripheral lip 32 is locally worn, the sealing performance of the inner peripheral lip 32 is reduced.

Accordingly, an object of the present invention is to provide a packing for preventing local wear of an inner peripheral lip.

[0005]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention of claim 1 comprises an annular packing body, and is formed on one side surface of the packing body so as to protrude in the axial direction and radially. An inner peripheral lip and an outer peripheral lip separated from each other, and a plurality of connecting ribs formed on the packing body so as to connect respective inner side surfaces of the inner peripheral lip and the outer peripheral lip and spaced apart in a circumferential direction, In the packing, the plurality of connecting ribs extend in a substantially tangential direction in the same direction with respect to the inner surface of the inner peripheral lip and have a height not exceeding the outer end surface of the inner and outer peripheral lips. The pressure receiving areas are equalized.

According to a second aspect of the present invention, an intermediate rib extending circumferentially is formed on a packing body between the inner peripheral lip and the outer peripheral lip, and the connecting rib is radially divided by the intermediate rib. The lower and upper divided connecting ribs connected to the inner peripheral lip of the divided upper and lower divided connecting ribs have the same pressure receiving area on the outer surface and the inner surface.

Further, according to the invention of claim 3, the outer surface length L1 and the inner surface length L2 of the lower split connecting rib on the side connected to the inner peripheral lip among the split upper and lower split connecting ribs.
Are made substantially equal, so that the pressure receiving areas of the outer surface and the inner surface of the lower split connecting rib are made equal.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of the present invention will be described. 1 and 2 show an embodiment of the packing of the present invention. An annular packing body 1; an inner peripheral lip 2 and an outer peripheral lip 3 formed on one side surface 1a of the packing body 1 so as to protrude in the axial direction and spaced apart in the radial direction; A plurality of connecting ribs 4 formed on the packing body 1 so as to connect the inner side surfaces 2a and 3a, and the plurality of connecting ribs 4 are circumferentially spaced from each other; 2a
, And extend substantially tangentially in the same direction and do not exceed the outer end faces 2b, 3b of the inner and outer lips 2, 3. The circumferential width t1 of each connection rib 4 is gradually reduced from the outer lip 3 side to the inner lip 2 side. On one side surface 1a of the packing body 1 between the inner peripheral lip 2 and the outer peripheral lip 3, an intermediate portion extending circumferentially and having a height not exceeding the outer end surfaces 2b and 3b of the inner and outer peripheral lips 2 and 3. A rib 5 is formed, and the connecting rib 4 is radially divided by the intermediate rib 5 into upper and lower divided connecting ribs 4b and 4a, and the inner periphery of the divided upper and lower divided connecting ribs 4b and 4a is formed. The height h1 of the lower split connecting rib 4a connected to the lip 2 is smaller than the height h2 of the upper split connecting rib 4b. The heights of the upper and lower divided connecting ribs 4b, 4a may be the same from the outer lip 3 side to the inner lip 2 side.

Also, the divided upper and lower divided connecting ribs 4
The pressure receiving areas of the outer side surface 401 and the inner side surface 400 of the lower divided connecting rib 4a on the side connected to the inner peripheral lip 2 among the b and 4a are substantially equal. As a method for making the pressure receiving areas substantially equal, for example, as the configuration that is the easiest and most reliable, the length L1
And the length L2 of the inner side surface 400 is made substantially equal. In the present invention, since the pressure receiving areas of the outer side surface 401 and the inner side surface 400 of the lower split connecting rib 4a may be made substantially equal, various methods are possible without being limited to making the lengths L1 and L2 equal. is there.

As understood from this embodiment, the lower split connecting rib 4a has an outer surface 401 and an inner surface 400.
Are almost equal, the pressures acting on the outer side surface 401 and the inner side surface 400 of the lower split connecting rib 4a during the hydraulic operation of the packing are equalized, and a balanced state is attained. As a result, there is no extra pressing force acting on the inner peripheral lip 2 by the lower split connecting rib 4a.

In each of the above embodiments, the number of the intermediate ribs 5 is one. However, the number of the intermediate ribs 5 may be plural, and a packing without the intermediate ribs 5 may be used. Further, the height of the intermediate rib 5 may appropriately exceed the outer end surfaces 2b, 3b of the inner and outer lips 2, 3.

[0012]

As described above, according to the first aspect of the present invention, the annular packing body, the inner peripheral lip and the outer peripheral lip formed on one side surface of the packing body in the axial direction and separated in the radial direction are provided. A plurality of connecting ribs formed on the packing body so that the inner surfaces of the inner lip and the outer lip are connected to each other, and a plurality of connecting ribs spaced apart in the circumferential direction. In the packing extending substantially tangentially in the same direction with respect to the inner side surface and having a height not exceeding the outer end surfaces of the inner and outer peripheral lips, the pressure receiving areas of the outer side surface and the inner side surface of the connecting rib are made equal. For this reason,
When hydraulic pressure is applied to the packing, the pressures acting on the outer side surface and the inner side surface of the lower split connecting rib become equal, and the equilibrium state is established. As a result, the lower split connecting rib does not exert an excessive pressing force on the inner peripheral lip, thereby preventing local wear of the inner peripheral lip and lowering the sealing performance of the inner peripheral lip.

In the invention according to claim 2, an intermediate rib extending circumferentially is formed on the packing body between the inner peripheral lip and the outer peripheral lip, and the connecting rib is radially extended by the intermediate rib. Of the divided upper and lower split connecting ribs that are divided, the lower split connecting rib on the side connected to the inner peripheral lip has the same pressure receiving area on the outer surface and inner surface, and only the lower split connecting rib is considered The pressure receiving area can be easily obtained.

Further, in the invention of claim 3,
The outer surface length L1 and the inner surface length L2 of the lower split connecting rib on the side connected to the inner peripheral lip of the divided upper and lower split connecting ribs are made substantially equal, so that the outer surface of the lower split connecting rib is formed. The inner surface and the inner surface have the same pressure receiving area, so that the shape is simple and the pressure receiving area can be obtained more easily.

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a conventional packing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Packing main body 2 Inner peripheral lip 3 Outer peripheral lip 4 Connecting rib 4a Lower split connecting rib 4b Upper split connecting rib 5 Intermediate rib

Claims (3)

[Claims] 1. An annular packing body, an inner lip and an outer lip formed on one side surface of the packing body so as to protrude in the axial direction and spaced apart in the radial direction, and each of the inner lip and the outer lip. A plurality of connection ribs formed on the packing body so that the side surfaces are connected and spaced apart in a circumferential direction, wherein the plurality of connection ribs are substantially tangential in the same direction with respect to the inner surface of the inner peripheral lip. Wherein the pressure receiving area of the outer side surface and the inner side surface of the connecting rib are equalized. 2. An intermediate rib extending circumferentially is formed on a packing body between the inner peripheral lip and the outer peripheral lip, and the connecting rib is radially divided by the intermediate rib, and the divided upper and lower portions are formed. The packing according to claim 1, wherein a pressure receiving area of an outer surface and an inner surface of a lower split connecting rib on a side connected to the inner peripheral lip of the split connecting ribs are equalized. 3. The lower divided portion is formed by making the outer surface length L1 and the inner surface length L2 of the lower divided connecting rib on the side connected to the inner peripheral lip of the divided upper and lower divided connecting ribs substantially equal. The packing according to claim 2, wherein the pressure receiving areas of the outer side surface and the inner side surface of the connecting rib are made equal.