JP2001099329A - Sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the annular seat holding property, and to show the stabilized sealing function in a sealing device having the annular resin seat. SOLUTION: In a sealing device 1 formed by holding an annular resin seat 10 with two metal rings 20, 30, the inner surface of a part of any one of the metal rings 20 (30) for pinching the annular seat 10 is provided with a recessed part 33 (24) so that a part of the annular seat 10 inserted by the compression pinching force is hooked thereon in the rotating direction. Rotation of the annular seat 10 with a rotary member 3 is prevented by hooking the annular seat 10 on the recessed part 33 (24).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device used to partition an opposing annular space of two opposing members into two spaces. In particular, the sealing device of the present invention, a configuration using a resin annular sheet as a seal lip,
It is designed to be used for backing up rubber seal lips.

[0002]

2. Description of the Related Art FIG. 9 shows an example of a conventional sealing device. The sealing device 1 in the illustrated example includes an annular sheet 10 made of fluororesin.
Are held by two metal rings 20, 30. The first metal ring 20 on the outer diameter side is press-fitted to the inner peripheral surface of the case 2, and the inclined portion on the inner diameter side of the annular sheet 10 is formed. Is made to slidably contact the outer peripheral surface of the rotary shaft 3 from the radial direction, so that the opposed annular space between the case 2 and the rotary shaft 3 is partitioned in the axial direction.

The two metal rings 20, 30 each have a cylindrical portion 21, 31 and annular plate portions 22, 32 extending radially inward at one axial end of the cylindrical portion 21, 31. It is. A second metal ring 30 is provided on the inner diameter side of the first metal ring 20.
Are press-fitted or clearance-fitted so as to overlap each other, so that the annular sheet 1 is located between the two annular plate portions 22 and 32.
The outer diameter side portion of the cylinder 0 is compressed and held.

[0004]

In the above conventional example, two metal rings 20,
At 30, the portion pinched by compression tends to be permanently plastically deformed and thinned, resulting in the following problems.

That is, in the above-described state, when the contact pressure of the annular sheet 10 with respect to the rotating shaft 3 increases with the increase in the pressure on the sealed space side, the two metal rings 20 and 30 in the annular sheet 10 are formed. As a result, the thinned portion slips and slides integrally with the rotating shaft 3, thus deteriorating the sealing performance.

By the way, in addition to the above sealing device, for example, as shown in FIG. 4 cited in the description of the embodiment of the present invention, a rubber sealing lip 40 is attached to the annular plate portion 22 of the first metal ring 20. There is a configuration in which the annular sheet 10 is baked and adhered and used as a backup ring for supporting the seal lip 40 from the inner diameter side to increase rigidity. In the case of such a configuration, when the corotation of the annular sheet 10 as described above occurs, the edge of the annular sheet 10 comes into sliding contact with the seal lip 40, and the seal lip 40 is worn. There is a risk of causing damage.

In view of such circumstances, an object of the present invention is to provide a sealing device having a resin-made annular sheet, which enhances the holding properties of the annular sheet and exerts a stable sealing function.

[0008]

A first sealing device according to the present invention comprises a first metal ring fixed to one member side of two members arranged opposite to each other, and a first metal ring fitted and fixed in an overlapping state with the first metal ring. 2
With the metal ring, a portion of the resin annular sheet that is brought into sliding contact with the other member is compression-clamped, and at least one of the metal rings on the inner surface of the portion that clamps the annular sheet, A dent is provided to allow a part of the annular sheet to enter by the compression pinching force and to be caught in the rotational direction.

A second sealing device according to the present invention axially partitions an opposed annular space between two members disposed concentrically inside and outside in a radial direction, and a first metal fitted and fixed to one member side. A ring, a second metal ring fitted and fixed in an overlapping state with the first metal ring, and a resin annular sheet held by the two metal rings and brought into sliding contact with the other member. An annular plate portion extending in the radial direction is provided on each of the two metal rings, and a radially required area of the annular sheet is compression-clamped between the annular plate portions, and at least one of the annular plate portions is provided. A recess is formed in the inner surface of the annular plate portion of one of the metal rings to allow a part of the annular sheet to enter by the compression pinching force and to be caught in the rotation direction.

In a third sealing device according to the present invention, in the first or second sealing device, the depression is a circular hole with a bottom or a groove along a radial direction, and is provided at one or several positions on the circumference. Is provided.

According to a fourth aspect of the present invention, in the sealing device according to any one of the first to third aspects, the dent is formed by shaving, and the dent is formed on the opening side of the dent due to the shaving. Burrs to be left.

According to a fifth aspect of the present invention, there is provided the sealing device according to any one of the first to fourth aspects, wherein the one metal ring has a rubber sealing lip slidably contacting the other member. The annular sheet is used as a backup ring for supporting the rubber seal lip.

In such a configuration of the present invention, since a part of the annular sheet bites into the recess provided in at least one of the two metal rings, the rotational resistance to the annular sheet is thereby reduced. To be granted
The annular sheet does not have to rotate together with the rotating member.

Further, if wedge-shaped projections such as burrs generated on the opening side of the dent due to the shaving of the dent are left, the wedge-shaped projection will bite into the annular sheet. The rotational resistance of the seat increases,
It is more advantageous.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described based on embodiments shown in the drawings.

FIGS. 1 to 3 show an embodiment of the present invention. FIG. 1 is a sectional view of the upper half of the sealing device, FIG.
FIG. 3 is a sectional view taken along the line (2)-(2) of FIG. 1, and FIG. 3 is a perspective view of the second metal ring partially broken.

The illustrated sealing device 1 has a structure in which an annular sheet 10 made of a fluororesin is held by two metal rings 20, 30, and a first metal ring 20 arranged on the outer diameter side. Is press-fitted onto the inner peripheral surface of the case 2, and one side of the inclined portion on the inner diameter side of the annular sheet 10 is pressed against the outer peripheral surface of the rotary shaft 3, so that the case 2 and the rotary shaft 3
To partition the annular space opposite to.

The annular sheet 10 is made of, for example, a fluororesin such as PTFE (polytetrafluoroethylene resin), and a portion thereof is obliquely bent from the middle in the radial direction to the inner diameter side.

The two metal rings 20, 30 each have a cylindrical portion 21, 31 and annular plate portions 22, 32 extending radially inward at one axial end of the cylindrical portion 21, 31. And is made of, for example, JIS standard SPCC.

A second metal ring 30 is provided on the inner diameter side of the first metal ring 20.
Are press-fitted or clearance-fitted so as to overlap each other, so that the annular sheet 1 is located between the two annular plate portions 22 and 32.
The outer diameter side portion of the cylinder 0 is compressed and held. The free end of the cylindrical portion 21 of the first metal ring 20 is made thin, and the thin portion 23 is bent to prevent the second metal ring 30 from coming off.

In this embodiment, recesses 33 for making a part of the annular sheet 10 bite are formed in several places on the outer surface of the annular plate portion 32 of the second metal ring 30 (for example, two places facing 180 degrees). The feature is that it is provided.

The depression 33 has a substantially circular shape in plan view.
It is formed to have a substantially concave cross section, and is formed by, for example, pressing or turning.

If such recesses 33 are provided, when the annular sheet 10 is compressed and sandwiched between the annular plates 22, 32 of the two metal rings 20, 30, the recesses are formed in the annular sheet 10 by the compression sandwiching force. Only the region corresponding to 33 expands and enters into the depression 33. When such bite occurs, the bite is caught in the rotation direction and imparts rotational resistance to the annular sheet 10, so that the annular sheet 10 does not need to rotate together with the rotating shaft 3.

As described above, when the depression 33 is formed by turning, wedge-like projections such as burrs are formed on the opening side peripheral edge of the depression 33 (not shown). If it is, annular sheet 1
Since the wedge-shaped projections pierce the annular sheet 10 in the process of pinching 0, the wedge action increases the rotational resistance of the annular sheet 10.

It should be noted that the present invention is not limited to only the above embodiment, and various applications and modifications are conceivable.

(1) In the above embodiment, the annular sheet 10
Is used as a seal lip as an example, but the present invention is also applicable to a sealing device having a configuration as shown in FIG. The sealing device 1 in the illustrated example is for baking and bonding a rubber seal lip 40 to the annular plate portion 21 of the first metal ring 20 to increase the rigidity of the annular sheet 10 by supporting the seal lip 40 from the inner diameter side. It is configured to be used as a backup ring. In this case as well, the point that the annular sheet 10 is prevented from rotating together with the rotating shaft 3 integrally by the recess 33 is the same, but the edge portion of the annular sheet 10 with respect to the rubber seal lip 40 Since it is not necessary to make a sliding contact, wear can be avoided and the life can be extended.

(2) In the above embodiment, the second metal ring 30
Although the example in which the depression 33 is provided is given, the depression 24 may be provided on the inner surface of the annular plate portion 21 of the first metal ring 20 as shown in FIGS. 5 and 6. This is the same for the sealing device having the configuration described in the above (1). In addition, the depressions 33, in both of the two metal rings 20, 30,
24 may be provided.

(3) In the above embodiment, the depressions 33, 24
Is formed to have a substantially circular shape in a plan view and a concave cross section. However, as shown in FIGS. 7 and 8, it may be formed in a groove shape extending in the radial direction and opening to the outer or inner diameter side. Good. In the illustrated example, a depression 33 is provided in the second metal ring 30. In this case, the margin for catching the annular sheet 10 in the circumferential direction increases, which is advantageous in preventing corotation. In addition, although not shown, the groove-shaped depression 33 may be opened radially inward and outward.

(4) With respect to the substantially circular depressions 33 and 24 shown in the above embodiment, the shape in plan view is not limited to a circle, but may be a rectangle or the like. In addition, this hollow 3
Each of 3, 3 may have a conical shape or a pyramid shape whose diameter gradually increases from the bottom side toward the opening side. Further, the groove-shaped depressions 33 and 24 shown in the above (3) can be formed to have a shape that gradually becomes wider from the center in the circumferential direction of the bottom toward both sides in the circumferential direction on the opening side.

(5) In each of the above embodiments, the radial type sealing device 1 is taken as an example, but the present invention can be applied to a thrust type sealing device.

[0031]

According to the first to fifth aspects of the present invention, the annular sheet is compressed and sandwiched between the two metal rings so that only the area corresponding to the depression in the annular sheet is expanded to enter the depression. Therefore, it becomes caught in the rotation direction and acts as rotation resistance of the annular sheet, so that the annular sheet can be prevented from rotating together with the rotating member.

In particular, according to the invention of claim 4, if wedge-like projections such as burrs generated on the opening side of the dent due to shaving of the dent are left, the wedge-like projection is formed on the annular sheet. Since it becomes possible to bite, the rotational resistance of the annular sheet is increased, which is more advantageous.

According to the fifth aspect of the present invention, in the case where the annular sheet is used as a backup ring for a rubber seal lip, the annular sheet is made to have a higher sealing lip by improving the holding property of the annular sheet. Sliding contact can be prevented, so that the seal lip can be prevented from being damaged, which contributes to a longer life.

As described above, in the sealing device using the annular sheet made of resin, the holding ability of the annular sheet can be enhanced and the sealing function can be stably exhibited.

[Brief description of the drawings]

FIG. 1 is a sectional view of an upper half of a sealing device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line (2)-(2) of FIG.

FIG. 3 is a perspective view of a partially broken second metal ring of FIG. 1;

FIG. 4 is a cross-sectional view of the upper half of a sealing device according to another embodiment of the present invention.

FIG. 5 is a sectional view of an upper half of a sealing device according to still another embodiment of the present invention.

FIG. 6 is a perspective view of the first metal ring of FIG. 5 with a partial cutaway;

FIG. 7 shows a modification of the depression formed in the metal ring, and FIG.
Figure corresponding to

FIG. 8 shows another modification of the depression formed in the metal ring.
Figure corresponding to FIG.

FIG. 9 is a cross-sectional view of the upper half of a conventional sealing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing device 2 Case 3 Rotating shaft 10 Annular sheet 20 1st metal ring 21 1st metal ring cylindrical part 22 1st metal ring annular plate part 30 2nd metal ring 31 2nd metal ring cylindrical part 32 2nd metal Ring plate 33

Claims (5)

[Claims] A first metal ring fixed to one member side of two members arranged opposite to each other, and a second metal ring fitted and fixed in a state of being superposed on the first metal ring, sliding on the other member; A sealing device in which a portion of a resin-made annular sheet to be brought into contact is compressed and sandwiched, wherein at least one of the metal rings sandwiches the annular sheet on an inner surface of the annular sheet by the compression sandwiching force. A sealing device, characterized by being provided with a dent that is partially inserted to be caught in the rotation direction. 2. A sealing device for axially partitioning an opposed annular space between two members radially inwardly and outwardly concentrically arranged, comprising a first metal ring fitted and fixed to one of the members. A second metal ring fitted and fixed to the first metal ring in an overlapping state, and a resin-made annular sheet held by the two metal rings and slidably contacted with the other member; Each of the two metal rings is provided with an annular plate portion extending in the radial direction. A radially required area of the annular sheet is compression-clamped between the two annular plates, and at least one of the metal rings is provided. A sealing device, wherein a concave portion is formed in an inner surface of the annular plate portion to allow a part of the annular sheet to enter by the compression sandwiching force and to be caught in a rotational direction. 3. The sealing device according to claim 1, wherein the depression is a bottomed circular hole or a groove along a radial direction, and is provided at one or several positions on the circumference. Sealing device. 4. The sealing device according to claim 1, wherein the dent is formed by shaving, and a burr generated on the opening side of the dent due to the shaving is left. A sealing device characterized by the above-mentioned. 5. The sealing device according to claim 1, wherein the one metal ring has a rubber seal lip slidably contacting the other member, and the annular sheet is A sealing device, which is used as a backup ring for supporting a rubber seal lip.