WO2010116932A1

WO2010116932A1 - Sealing device

Info

Publication number: WO2010116932A1
Application number: PCT/JP2010/055818
Authority: WO
Inventors: 健渡邉; 江口信行
Original assignee: Nok株式会社
Priority date: 2009-04-07
Filing date: 2010-03-31
Publication date: 2010-10-14
Also published as: JPWO2010116932A1; JP5273243B2

Abstract

Provided is a sealing device which can minimize mutual sliding of the constitution members of a combination seal regardless of the structure of the partner member or the like, in rotational use. A sealing device (1) comprises a first resin ring member (10) mounted in an annular groove provided in the outer circumferential surface of the shaft and touching the sidewall surface of the annular groove slidably while adhering to the inner circumferential surface of the bore, and a second ring member (20) consisting of a rubber-like elastic body and mounted between the first ring member and the bottom of the annular groove in order to push the first ring member (10) toward the inner circumferential surface of the bore, wherein the first ring member (10) has gaps between the ends (14, 15) which are formed because the first ring member has such a shape that is cut at at least one position on the circle, and the second ring member (20) has protrusions (21, 22) which can be fitted in the gaps of the first ring member (10) in order to minimize rotation between the first ring member (10) and the second ring member (20).

Description

Sealing device

The present invention relates to a sealing device for sealing an annular gap between a shaft hole of a housing and a rotating shaft inserted into the shaft hole.

¡Various types of sealing devices are used for hydraulic equipment depending on the application. A sealing device according to the prior art will be described with reference to FIGS. 6 to 8 are schematic half sectional views of the sealing device according to the prior art.

For example, for the purpose of maintaining hydraulic pressure, a seal ring 101 as shown in FIG. 6 is used. The seal ring 101 is attached to an annular groove 301 provided on the outer peripheral surface of the shaft 300 inserted into the shaft hole 201 of the housing 200, and is in close contact with the inner peripheral surface of the shaft hole 201 and the side wall surface of the annular groove 301. Thus, the annular gap 400 between the shaft hole 201 and the shaft 300 is sealed.

Further, when oil sealability is required, a lip packing having a seal lip or a combination seal (SP seal) in which a PTFE ring 102 and an elastic ring 103 are combined as shown in FIG. 7 is used. The PTFE ring 102 having excellent wear resistance slidably contacts the inner peripheral surface of the shaft hole 201 and the side wall surface of the annular groove 301, and the rubber ring 103 enhances the adhesion of the PTFE ring 102 to each sealing surface. It is configured as follows.

Further, when a combination seal is used in a portion where there is a rotational or swinging movement, as shown in FIG. 8, a rotation stopper 104 that suppresses the rotation of the PTFE ring 102 is provided, and sliding with the PTFE ring 102 is performed. A configuration for preventing wear of the rubber ring 103 due to the above is known.

However, in order to provide the rotation stopper 104 as described above, a special design is required for the housing 200 and the shaft 300 which are mating members, and the applicable mating member structure is limited. Therefore, when the detent 104 cannot be provided due to the structure of the mating member, it may be dealt with by bonding the PTFE ring 102 and the elastic ring 103 or the like. However, when the rotational speed between the housing 200 and the shaft 300 is high, peeling occurs at the bonded portion, and sliding between the PTFE ring 102 and the elastic ring 103 may not be sufficiently prevented.

As related technologies, there are those described in Patent Documents 1 to 4.

Japanese Utility Model Publication No. 62-068074 Japanese Utility Model Publication No. 06-012872 JP 09-133216 A JP 2003-014133 A

The present invention has been made to solve the above-described problems of the prior art, and the object of the present invention is to suppress the sliding of the constituent members of the combination seal regardless of the structure of the mating member in the rotation application. An object of the present invention is to provide a sealing device that can perform the above.

In order to achieve the above object, a sealing device according to the present invention comprises:
A sealing device for sealing an annular gap between a shaft hole provided in a housing and a shaft inserted into the shaft hole and rotating with respect to the shaft hole,
A resin-made first ring that is mounted in an annular groove provided on one peripheral surface of the shaft hole and the shaft, is in close contact with the other peripheral surface, and slidably contacts the side wall surface of the annular groove. Members,
A second ring member that is mounted between the first ring member and the groove bottom of the annular groove, and that presses the first ring member toward the other peripheral surface;
A sealing device comprising:
The first ring member has a gap between end portions formed by having a shape that is cut at least at one place on the circumference,
The second ring member has a convex portion that can fit into the gap of the first ring member in order to suppress rotation between the first ring member and the second ring member. To do.

Here, the rotation includes not only rotational motion in one direction but also rotational motion in both directions, rotational motion (oscillation) that rotates alternately in both directions within a specific range, and the like.

According to the present invention, the protrusion between the second ring member and the gap between the end portions of the first ring member are fitted to each other, so that the rotation between the first ring member and the second ring member is suppressed. Therefore, sliding between the first ring member and the second ring member that are in close contact with each other is suppressed, and wear of the second ring member made of a rubber-like elastic body is suppressed.

Further, according to the present invention, in order to suppress the sliding between the first ring member and the second ring member, a special structure or the like is not required for the shaft or housing to which the sealing device is attached. Therefore, restrictions on the structure and the like of the counterpart member that can be applied are eliminated, and the application range of the combination seal in the rotational application can be expanded.

As described above, according to the present invention, sliding between the constituent members of the combination seal can be suppressed regardless of the structure of the counterpart member or the like in the rotation application.

It is the schematic diagram which looked at the sealing device which concerns on an Example from the axial direction. It is C arrow line view of FIG. 1A. It is BB sectional drawing of FIG. 1A. It is AA sectional drawing of FIG. 1A. It is a typical half sectional view explaining the use condition of the sealing device concerning an example. It is a typical perspective view of the sealing device concerning the example in the cut part circumference of a resin ring. It is a typical perspective view explaining the structure of the modification 1 (the state which decomposed | disassembled the cut part periphery of the resin ring). It is a typical perspective view (state which assembled | attached the cut part periphery of the resin ring) explaining the structure of the modification 1. FIG. It is a typical perspective view explaining the structure of the modification 2 (the state which decomposed | disassembled the cut part periphery of the resin ring). It is a typical perspective view (state which assembled | attached the cut part periphery of the resin ring) explaining the structure of the modification 2. FIG. It is a typical half sectional view of the sealing device concerning a prior art. It is a typical half sectional view of the sealing device concerning a prior art. It is a typical half sectional view of the sealing device concerning a prior art.

DETAILED DESCRIPTION Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

(Example)
A sealing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1A to 5B. 1A to 1D are schematic views for explaining a configuration of a sealing device according to an embodiment of the present invention. FIG. 1A is a view seen from an axial direction, FIG. 1B is a view taken along arrow C in FIG. 1A, and FIG. 1A is a cross-sectional view taken along the line BB, and FIG. 1D is a cross-sectional view taken along the line AA in FIG. 1A. FIG. 2 is a schematic half sectional view for explaining a use state of the sealing device according to the embodiment of the present invention. FIG. 3 is a schematic perspective view of the sealing device according to the embodiment of the present invention around the cut portion of the resin ring. 4A and 4B are schematic perspective views for explaining the configuration of Modification 1. FIG. 4A shows a state in which the periphery of the cut portion of the resin ring is disassembled, and FIG. 4B shows a state in which the periphery of the cut portion of the resin ring is assembled. Each is shown. 5A and 5B are schematic perspective views for explaining the configuration of Modification 2. FIG. 5A shows a state where the periphery of the cut portion of the resin ring is disassembled, and FIG. 5B shows a state where the periphery of the cut portion of the resin ring is assembled. Each is shown.

The sealing device 1 according to the present embodiment is a so-called combination seal including a resin ring 10 as a first ring member and an elastic ring 20 as a second ring member.

The sealing device 1 is mounted in an annular groove 301 provided on the outer peripheral surface of the shaft 300 inserted into the shaft hole 201 provided in the housing 200, and between the inner peripheral surface of the shaft hole 201 and the outer peripheral surface of the shaft 300. The annular gap 400 is sealed. The shaft 300 is provided so as to be rotatable with respect to the shaft hole 201. The rotational motion of the shaft 300 includes not only rotational motion in one direction with respect to the shaft hole 201 but also rotational motion in both directions, rotational motion (oscillation) that rotates alternately in both directions within a specific range, and the like.

The resin ring 10 is disposed on the opening side of the annular groove 301, and the elastic ring 20 is disposed between the resin ring 10 and the groove bottom of the annular groove 301.

The resin ring 10 is an annular member having a substantially rectangular cross section made of a resin material such as PTFE. The resin ring 10 mounted in the annular groove 301 is pushed into the region on the other side in the axial direction by the pressure P acting from the region on one side in the axial direction and is urged in the outer diameter direction by the elastic ring 20. As a result, the side surface 11 of the resin ring 10 is in close contact with the side wall surface of the annular groove 301 and the outer peripheral surface 12 is in close contact with the inner peripheral surface of the shaft hole 201, thereby sealing the annular gap 400.

When the shaft 300 rotates with respect to the shaft hole 201, the side surface 11 of the resin ring 10 and the side wall surface of the annular groove 301 come into contact with each other while sliding.

The resin ring 10 has a shape that is cut at one place on the circumference, and is configured to be attachable to the annular groove 301 by deforming the cut portion 13 so as to open.

The resin ring 10 having such a cut portion 13 is manufactured by creating a molded product in which a cut portion having a substantially C-shape is formed in advance, and then brazing the cut portion 13 so that the cut portion 13 is closed. May be. Alternatively, a ring-shaped molded product may be created first, and then manufactured by actually cutting one place on the circumference later using a dedicated jig or the like.

Moreover, the cut part 13 may be provided not only in one place but in a plurality of places. The resin ring 10 may be configured to be divided into a plurality of members by providing the cut portions 13 at a plurality of locations to improve the assemblability.

The cut portion 13 of the resin ring 10 according to the present embodiment has a shape called a so-called step cut.

That is, one end portion 14 of both ends of the resin ring 10 formed by providing the cut portion 13 is provided with a convex portion 14a protruding in the circumferential direction from one side in the axial direction. Thereby, one end part 14 connects the end surface 14b of the convex part 14a, the end surface 14c provided on the other side in the axial direction of the convex part 14a, and the two end faces 14b and 14c having different positions in the circumferential direction. It is comprised in the edge part shape with a level | step difference in the circumferential direction provided with the level | step difference surface 14d perpendicular | vertical to an axis | shaft. On the other hand, the other end portion 15 of the resin ring 10 has a symmetrical shape with the one end portion 14, and is provided with a convex portion 15a protruding in the circumferential direction from the other side in the axial direction, and has two end faces 15b and 15c. And a step surface 15d perpendicular to the axis connecting them.

In the resin ring 10 configured as described above, the one end portion 14 and the other end portion 15 are combined so that the convex portion 14a and the convex portion 15a are adjacent to each other in the axial direction. Closed state. At this time, the stepped surface 14d of one end 14 and the stepped surface 15d of the other end 15 are in partial contact. Further, the end surface 14b of the one end portion 14 and the end surface 15c of the other end portion 15 are opposite to each other with the end surface 14c of the one end portion 14 and the end surface 15b of the other end portion 15 spaced apart from each other.

The outer peripheral surface 12 of the resin ring 10 forms a substantially annularly continuous seal surface when the cut portion 13 is closed, that is, when the step surface 14d and the step surface 15d are in contact with each other.

The elastic ring 20 is an annular member having a substantially rectangular cross section made of an elastic body such as synthetic rubber, and has substantially the same height (width in the axial direction) as the resin ring 10.

The elastic ring 20 mounted between the resin ring 10 and the groove bottom of the annular groove 301 presses the resin ring 10 against the inner peripheral surface of the shaft hole 201, and the inner surface of the outer peripheral surface 12 of the resin ring 10 and the shaft hole 201. Increase adhesion between the peripheral surface.

Two

convex portions

21 and 22 projecting in the outer diameter direction are provided on the outer peripheral surface of the elastic ring 20 that is in close contact with the inner peripheral surface of the resin ring 10. Each of the two

convex portions

21 and 22 is configured to be able to fit into the gap of the cut portion 13 of the resin ring 10 when the outer peripheral surface of the elastic ring 20 is in close contact with the inner peripheral surface of the resin ring 10.

The convex portion 21 is provided in a region on one axial side of the outer peripheral surface of the elastic ring 20, and the tip surface 14 b of the convex portion 14 a of one end portion 14 of the resin ring 10 and the end surface of the other end portion 15. It fits into the gap between 15c. Further, the convex portion 22 is provided in a region on the other side in the axial direction of the outer peripheral surface of the elastic ring 20, the tip surface 15 b of the convex portion 15 a of the other end portion 15 of the resin ring 10, and the one end portion 14. It fits into the gap between the end face 14c.

The gap formed in the cut portion 13 of the resin ring 10 is originally provided for the purpose of absorbing a dimensional error or a circumferential length change of the resin ring 10. That is, when the dimensional error is large or the circumference of the resin ring 10 is changed due to a temperature change or the like, the both

end portions

14 and 15 of the resin ring 10 are kept in contact with the stepped surfaces 14d and 15d. , 14 c, 15 b, 15 c, the seal ring 10 is properly sealed against the inner peripheral surface of the shaft hole 201 and the side wall surface of the annular groove 301 by approaching or separating from each other in the circumferential direction so as to narrow or widen the gap between Is configured to be maintained.

In this embodiment, the gap of the cut portion 13 is filled to some extent by the

convex portions

21 and 22 of the elastic ring 20, but a gap is provided in advance between the

convex portions

21 and 22 and the end face of the cut portion 13. Or by causing elastic deformation of the

projections

21 and 22, it is possible to allow a change in the gap of the cut portion 13.

In the present embodiment, a gap is provided between the side surfaces of the

convex portions

21 and 22 and the step surfaces 14d and 15d of the cut portion 13. This gap suppresses the

protrusions

21 and 22 from being caught between the contact surfaces of the

protrusions

14a and 15a when the cut part 13 is closed, and when the gap of the cut part 13 becomes narrow, This is a space for allowing a part of the compressed

convex portions

21 and 22 to escape.

According to the present embodiment, the clearance provided between the

end portions

14 and 15 of the resin ring 10 and the

convex portions

21 and 22 provided on the elastic ring 20 are fitted to each other, whereby the resin ring 10 and the elastic ring are fitted. It is possible to prevent the rotation from occurring between 20 and 20. Accordingly, sliding between the resin ring 10 and the elastic ring 20 that are in close contact with each other is suppressed, and the rubber elastic ring 20 is suppressed from being worn by sliding with the resin ring 10 made of resin.

Further, the gap formed in the cut portion 13 of the resin ring 10 forms a leakage flow path in the cut portion 13, but according to the present embodiment, the

convex portions

21 and 22 of the elastic ring 20 are cut in the resin ring 10. By completely or partially filling the gap of the portion 13, it is possible to reduce the amount of leakage at the cut portion 13.

Further, according to the present embodiment, in order to suppress the sliding between the resin ring 10 and the elastic ring 20, the shaft hole 201 and the shaft 300 of the housing 200 to which the sealing device 1 is attached are provided with a special structure or the like. There is no need to change to Therefore, restrictions on the structure and the like of the counterpart member that can be applied are eliminated, and the application range of the combination seal in the rotational application can be expanded.

Further, according to the present embodiment, since the

convex portions

21 and 22 fitted in the gap of the cut portion 13 are exposed to the annular gap 400, the fitting between the

convex portions

21 and 22 and the gap of the cut portion 13 is performed. It is possible to check the status from the outside. Therefore, it is easy to find a mounting failure, and it is possible to prevent the device from being used while the mounting state is not correct.

(Modification)
A modification of the sealing device according to the embodiment of the present invention will be described with reference to FIGS. 4A to 5B. Here, only matters different from the embodiment will be described, and common members and configurations will be denoted by the same reference numerals as those of the embodiment, and detailed description thereof will be omitted.

As the configuration of the cut portion 13 of the resin ring 10, not only the above-described step cut shape but also various other configurations are conventionally known. The present invention can also be applied to such various configurations.

For example, the cut portion 13a shown in FIGS. 4A and 4B is provided with a second convex portion 14e on the inner peripheral side with respect to the convex portion 14a of one end portion 14. The second convex portion 14 e includes an outer peripheral surface 14 f that contacts the inner peripheral surface of the convex portion 15 a of the other end portion 15. Similarly, the other end portion 15 is provided with a second convex portion 15 e on the inner peripheral side of the convex portion 15. The 2nd convex part 15e is provided with the outer peripheral surface 15f which contacts the internal peripheral surface of the convex part 14a of one edge part 14. As shown in FIG. Further, a gap is formed between the tip surfaces 14g and 15g of the second

convex portions

14f and 15f to absorb a change in circumference.

The cut portion 13a is configured to effectively suppress leakage from the gap between the cut portions by increasing the contact surfaces of the

convex portions

14a and 15a as compared with the step cut shape of the above embodiment.

On the other hand, unlike the above embodiment, the elastic ring 20 is provided with one convex portion 23 on the outer peripheral surface. This convex part 23 is comprised so that it can fit in the clearance gap between the front end surfaces 14g and 15g of the 2nd

convex parts

14e and 15e in the cut part 13a of the resin ring 10. FIG.

Further, in the cut portion 13b shown in FIG. 5A and FIG. 5B, a second convex portion 14h that protrudes further in the circumferential direction than the convex portion 14a protrudes on the inner peripheral side of the convex portion 14a. It is provided integrally with the portion 14a. The second convex portion 14 h includes an outer peripheral surface 14 i that contacts the inner peripheral surface of the convex portion 15 a of the other end portion 15. On the other hand, the other end portion 15 is provided with a concave portion 15h that is recessed in the circumferential direction from the end surface 15c on the inner peripheral side of the convex portion 15a. The concave portion 15h includes an inner peripheral surface 15i continuous with the inner peripheral surface of the convex portion 15a. The inner peripheral surface 15i contacts the outer peripheral surface 14i of the second convex portion 14h of the one end portion 14 together with the inner peripheral surface of the convex portion 15a in a state where the cut portion 13b is closed. Further, a gap is formed between the tip surface 14j of the second convex portion 14h and the end surface 15j of the concave portion 15h to absorb a change in circumference.

As with the cut portion 13a shown in FIGS. 4A and 4B, this cut portion 13b also has an effect of preventing leakage from the gap of the cut portion by increasing the contact surfaces of the

convex portions

14a and 15a as compared with the step cut shape of the above embodiment. It is the composition which can be controlled automatically.

On the other hand, the elastic ring 20 is provided with one convex portion 23 on the outer peripheral surface as in the modification shown in FIGS. 4A and 4B. The convex portion 23 is configured to be able to fit into a gap between the tip surface 14j of the second convex portion 14h and the end surface 15j of the concave portion 15h in the cut portion 13b of the resin ring 10.

Also in the modified examples shown in FIGS. 4A to 5B, the gap provided between the

end portions

14 and 15 of the resin ring 10 and the convex portion 23 provided in the elastic ring 20 are fitted in the same manner as in the above embodiment. Thus, rotation between the resin ring 10 and the elastic ring 20 is suppressed, and wear of the elastic ring 20 due to sliding between the resin ring 10 and the elastic ring 20 is suppressed.

Moreover, the clearance gap formed in the

cut parts

13a and 13b of the resin ring 10 forms a leakage flow path in the cut part 13 when the size of the annular gap 400 partially expands due to the eccentricity of the shaft 300, for example. In some cases, the convex portion 23 of the elastic ring 20 fills the gaps between the

cut portions

13a and 13b of the resin ring 10 completely or to some extent, thereby reducing the amount of leakage at the

cut portions

13a and 13b. .

Moreover, in order to suppress the sliding between the resin ring 10 and the elastic ring 20, a special structure or the like is not required for the shaft hole 201 or the shaft 300 of the housing 200, and there is a restriction on the structure of an applicable counterpart member. Thus, the application range of the combination seal in the rotation application can be expanded.

In the above-described embodiments and modifications, the configuration in which the sealing device 1 is mounted in the annular groove 301 formed on the outer peripheral surface of the shaft 300 has been described. However, the sealing device 1 is provided on the inner peripheral surface of the shaft hole 201 of the housing 200. The present invention can be applied even to a configuration in which the annular groove is mounted.

DESCRIPTION OF SYMBOLS 1 Sealing device 10 Resin ring 11 Side surface 12 Outer peripheral surface 13 Cut part 14 One end part 14a Convex part

14b End surface

14c End surface

14d Step surface 15 Other end part 15a Convex part

15b End surface

15c End surface

15d Step surface 20 Elastic rings 21 and 22 Projection 200 Housing 201 Shaft hole 300 Shaft 301 Annular groove 400 Annular gap

Claims

A sealing device for sealing an annular gap between a shaft hole provided in a housing and a shaft inserted into the shaft hole and rotating with respect to the shaft hole,
A resin-made first ring that is mounted in an annular groove provided on one peripheral surface of the shaft hole and the shaft, is in close contact with the other peripheral surface, and slidably contacts the side wall surface of the annular groove. Members,
A second ring member that is mounted between the first ring member and the groove bottom of the annular groove, and that presses the first ring member toward the other peripheral surface;
A sealing device comprising:
The first ring member has a gap between end portions formed by having a shape that is cut at least at one place on the circumference,
The second ring member has a convex portion that can fit into the gap of the first ring member in order to suppress rotation between the first ring member and the second ring member. Sealing device.