JP2004176834A - Sealing ring for dovetail - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent a sealing ring 1 from projecting from a dovetail 22 and simultaneously prevent parts of both sides of the sealing ring 1 between each other from touching each other. <P>SOLUTION: The sealing ring 1 consisting of a rubbery elastic material is formed with a pair of insertion grooves 11, 12 continuing in the circumferential direction on both sides of the radial direction. The deepest parts 11a, 12a of the insertion grooves 11, 12 locates on the outside of the grooves far from an axial direction center part of the sealing ring 1 and simultaneously locates on the outside of the axial direction far from groove shoulders 22a, 22b of the dovetail 22 in initial attachment condition. The sealing ring is also formed with conical slope surfaces 11b, 12b capable of coming into close contact with inside surfaces 22d, 22e of the dovetail 22 on the inside of the grooves. The sealing ring is locked to come off by the insertion grooves 11 ,12 being interposed between the groove shoulders 22a,22b so that the conical slope surfaces 11b, 12b of the insertion grooves 11, 12 bring into close contact with inside surfaces 22d, 22e of the dovetail 22 in the initial attachment condition. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a seal ring that seals by interposing a suitable pressing margin between parts facing each other, and more particularly to a seal ring suitable for mounting in a dovetail groove.
[0002]
[Prior art]
As a sealing means between two parts in a rotating part such as a rotating shaft and a housing on an outer periphery thereof, an axial reciprocating part such as a piston and a cylinder, or a part which comes and comes apart from each other such as a valve body and a valve seat in a valve device. For example, a seal ring formed of a rubber-like elastic material into an annular shape such as an O-ring is often used. 7 and 8 show a conventional sealing structure using an O-ring, in which an O-ring 101 is provided in a dovetail groove 102b formed on a surface 102a of one part 102 facing the other part. Is held. Note that such a sealing structure is also described in, for example, Patent Document 1 below.
[0003]
[Patent Document 1]
Japanese Utility Model Laid-Open Publication No. 4-127460 (FIG. 1)
[0004]
[Problems to be solved by the invention]
In the above-mentioned conventional technique, the O-ring 101 is held in the dovetail groove 102b in order to prevent the O-ring 101 from falling off. However, as shown in FIG. 7, when the O-ring 101 has a relatively small diameter and is loosely fitted in the dovetail groove 102b, the other component 103 facing the component 102 in which the dovetail groove 102b is formed has a different shape. When the component 103 moves in the opening direction OP in a case where the O-ring 101 is opened and closed in a direction in which the component 103 comes into contact with and separates from the component 102, the O-ring 101 may stick out of the dovetail groove 102b due to adhesion to the component 103. There is. In addition, the small-diameter O-ring 101 also has a small crushing allowance, so that when the component 103 moves in the closing direction CL, the opposing surfaces 102a and 103a of the two components 102 and 103 are likely to come into metal contact with each other, and particles are generated. I couldn't use it under the conditions I hated.
[0005]
In order to prevent metal contact between the parts 102 and 103, as shown in FIG. 8, an O-ring 101 having a wire diameter appropriately larger than the opening width of the dovetail groove 102b is used, It is effective to mount the outer portion appropriately so as to be pressed in the X direction between the groove shoulders 102c and 102d of the dovetail groove 102b. However, in this case, at the time when the dovetail groove 102b is incorporated into the O-ring 101, the stress caused by the compression of the contact portion 101a with the groove bottom of the dovetail groove 102b in the Y direction is caused by the groove shoulders 102c and 102d. When the contact portions 101b and 101c are compressed in the X direction, a tensile stress in the Y direction generated in the portion 101d therebetween acts on the O-ring 101 in the protruding direction. Therefore, even in the mounting structure as shown in FIG. 8, when the other component 103 moves in the opening direction, there is a possibility that the O-ring 101 may jump out due to the adhesiveness of the rubber. Moreover, the incorporation into the dovetail groove 102b was also poor.
[0006]
The present invention has been made in view of the above-described problems, and a technical problem of the present invention is to effectively prevent the seal ring from jumping out of the dovetail groove and to prevent members on both sides of the seal ring from coming into contact with each other. Is to prevent it.
[0007]
[Means for Solving the Problems]
As a means for effectively solving the above-described technical problem, a dovetail groove seal ring according to the invention of claim 1 is provided with a dovetail groove held in a dovetail groove formed in one of the parts facing each other and a rubber-like elasticity. A seal ring made of a material, a pair of fitting grooves capable of fitting with the groove shoulder of the dovetail groove is formed on both sides in the radial direction outside the groove from the center in the axial direction, and the deepest part of this groove is initially formed. In the state, it is located outside the shoulder of the groove.
[0008]
A dovetail groove seal ring according to a second aspect of the present invention is the lip according to the first aspect, wherein a portion of each dovetail inside the dovetail groove can be in close contact with a groove bottom of the dovetail groove. And a portion outside the dovetail groove from each of the fitting grooves forms a lip portion that can be in close contact with the other component.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a preferred embodiment of a dovetail groove seal ring according to the present invention will be described with reference to the drawings. First, FIG. 1 is a half cross-sectional view showing a seal ring according to the first embodiment cut along a plane passing through the axis thereof, and FIG. 2 shows a state where the seal ring according to the first embodiment is mounted in a dovetail groove. FIG. 3 is a partial cross-sectional view cut along a plane passing through the axis, and FIG. 3 is a sectional view taken along a plane passing through the axis, showing a state where the seal ring according to the first embodiment is compressed in the axial direction between members on both sides thereof. FIG.
[0010]
As shown in FIG. 1, a seal ring 1 according to a first embodiment is formed in a ring shape from a rubber-like elastic material, and has a partially cut circular cross section cut along a plane passing through an axis. , That is, it basically has a shape as an O-ring. As shown in FIG. 2, the seal ring 1 is held on an axial end surface 21 of the first component 2 made of metal and in an annular dovetail groove 22 formed along the outer periphery of the opening 23. Things.
[0011]
Specifically, the dovetail groove 22 of the first part 2 is inclined in a conical shape so that the groove width on the groove shoulders 22a and 22b side is relatively narrow and the groove width on the groove bottom 22c side is relatively wide. It has a pair of inner surfaces 22d, 22e. In the seal ring 1, the axial wire diameter φ shown in FIG. 1 is appropriately larger than the groove depth D of the dovetail groove 22 shown in FIG. 2, and the cross-sectional radius (φ / 2) is the groove depth. Slightly smaller than D.
[0012]
The seal ring 1 is formed with a pair of circumferentially continuous fitting grooves 11 and 12 on both sides in the radial direction. The deepest portions 11a, 12a of the fitting grooves 11, 12 are located axially outside the axial center portion (cross-sectional center G) of the seal ring 1, and in the initial mounting state, the groove shoulders 22a, 22a of the dovetail groove 22 are provided. Conical inclined surfaces 11b and 12b which are located axially outward of the dovetail groove 22b and which can be in close contact with the inner side surfaces 22d and 22e of the dovetail groove 22 are formed on the axially inner side.
[0013]
Therefore, in the initial mounting state shown in FIG. 2, the seal ring 1 is so fitted that the conical inclined surfaces 11 b, 12 b of the fitting grooves 11, 12 are in close contact with the inner side surfaces 22 d, 22 e of the dovetail groove 22. When the mating grooves 11 and 12 are sandwiched between the groove shoulders 22a and 22b, they are prevented from coming off, and the convex surface 13 on the side where the fitting grooves 11 and 12 are unevenly projected protrudes outside the dovetail groove 22 and the convex surface on the other side. 14 comes into contact with the groove bottom 22c, and the deepest portions 11a, 12a of the fitting grooves 11, 12 are appropriately located outside the groove shoulders 22a, 22b.
[0014]
Here, as shown in FIG. 3, the second component 3 that is disposed so as to be axially movable with respect to the first component 2 and that closes or opens the opening 23 in the first component 2 is moved in the closing direction CL. When the opening 23 is completely closed by the operation, the convex surface 13 on the outer side of the groove of the seal ring 1 is brought into close contact with the facing surface 31 of the second component 3 with an appropriate crushing margin.
[0015]
When the seal ring 1 is not compressed, the deepest portions 11a and 12a of the fitting grooves 11 and 12 which are outside the groove shoulders 22a and 22b of the dovetail groove 22 are, as shown in FIG. By receiving the compressive force in the axial direction (CL direction) from the component 3, the fitting is closely fitted to the groove shoulders 22 a and 22 b, and the convex surface 14 on the inner side of the groove is appropriately crushed on the groove bottom 22 c of the dovetail groove 22. Being close together for generations. Therefore, excellent sealing properties can be obtained.
[0016]
Also, the seal ring 1 is configured such that the deepest portions 11a, 12a of the fitting grooves 11, 12 are closely fitted to the groove shoulders 22a, 22b of the dovetail groove 22, and the convex surface 13 on the outer side of the groove is separated from the second component 3. When receiving the compressive force in the CL direction, the radially generated stress causes the portions 13a and 13b which are relatively convex to the inner and outer peripheral sides outside the fitting grooves 11 and 12, It protrudes and intervenes between the opposing surfaces 21 and 31 of the first component 2 and the second component 3. For this reason, metal contact between the first component 2 and the second component 3 is prevented, and thus the generation of metal particles and the like can be prevented. Therefore, the present invention can also be used for precision equipment that does not want to generate particles. .
[0017]
By the way, when the closed state shown in FIG. 3 is held for a relatively long time, the convex surface 13 of the seal ring 1 causes the convex surface 13 of the seal ring 1 It may stick to the surface 31. In addition, such adhesion may occur due to components of the fluid to be sealed existing in the opening 23 of the first component 2.
[0018]
Therefore, when the second component 3 moves in the opening direction OP with respect to the opening 23 from the closed state shown in FIG. Try to move in the direction. However, such movement is prevented by the conical inclined surfaces 11b and 12b of the fitting grooves 11 and 12 of the seal ring 1 coming into close contact with the conical inner side surfaces 22d and 22e of the dovetail groove 22. The seal ring 1 is effectively prevented from coming out and falling out of the groove 22, and can be reliably held in the dovetail groove 22.
[0019]
Next, a second embodiment of the dovetail groove seal ring according to the present invention will be described. FIG. 4 is a half sectional view showing the dovetail seal ring according to the second embodiment cut along a plane passing through the axis thereof, and FIG. 5 shows a state in which the seal ring according to the second embodiment is mounted in the dovetail groove. FIG. 6 is a partial cross-sectional view cut along a plane passing through the axis, and FIG. 6 is a plane passing through the axis in a state where the seal ring according to the second embodiment is axially compressed between members on both sides thereof. FIG.
[0020]
The seal ring 1 according to the second embodiment is also formed in an annular shape from a rubber-like elastic material so that four lip portions 15 to 18 continuous in the circumferential direction form an X-shaped cross section with each other. It has a cross-sectional shape similar to a so-called X-ring formed, and is formed along the outer periphery of the opening 23 on one axial end surface 21 of the first component 2 made of metal as shown in FIG. It is held in an annular dovetail groove 22.
[0021]
Specifically, the seal ring 1 is formed with a pair of circumferentially continuous fitting grooves 11 and 12 on both sides in the radial direction, similarly to the first embodiment. The deepest portions 11a, 12a of the fitting grooves 11, 12 are located axially outside the central portion of the seal ring 1 in the axial direction, and in the initial mounting state, are more axially than the groove shoulders 22a, 22b of the dovetail groove 22. Conical inclined surfaces 11b and 12b are formed on the outer side in the axial direction and on the inner side in the axial direction and can be in close contact with the inner side surfaces 22d and 22e of the dovetail groove 22. Also, a pair of lip portions that can be in close contact with the second component 3 (see FIG. 6) that is movably opposed to the first component 2 in the axial direction on the outside where the fitting grooves 11 and 12 are unevenly distributed. 15 and 16 are formed continuously in the circumferential direction, and on the opposite side, a pair of lip portions 17 and 18 that are in close contact with the groove bottom 22c of the dovetail groove 22 are formed.
[0022]
Therefore, in the initial mounting state shown in FIG. 5, the seal ring 1 is so fitted that the conical inclined surfaces 11b, 12b of the fitting grooves 11, 12 are in close contact with the inner side surfaces 22d, 22e of the dovetail groove 22. When the mating grooves 11 and 12 are sandwiched between the groove shoulders 22a and 22b, they are prevented from coming off, and the lip portions 15 and 16 on the side where the fitting grooves 11 and 12 are unevenly projected protrude outside the dovetail groove 22. The side lip portions 17 and 18 are in contact with the groove bottom 22c, and the deepest portions 11a and 12a of the fitting grooves 11 and 12 are appropriately located outside the groove shoulders 22a and 22b.
[0023]
Here, as shown in FIG. 6, when the second component 3 moves in the closing direction CL to close the opening 23, the seal ring 1 is configured such that the lip portions 15, 16 have an appropriate crushing margin. With this, it is brought into close contact with the facing surface 31 of the second component 3. On the other hand, when the seal ring 1 is not compressed, the deepest portions 11 a and 12 a of the fitting grooves 11 and 12 that were outside the groove shoulders 22 a and 22 b of the dovetail groove 22 are in the axial direction from the second component 3. (CL direction) By receiving the compressive force, the grooves are closely fitted to the groove shoulders 22a, 22b, and the lip portions 17, 18 inside the groove are fitted to the groove bottom 22c and the inner side surfaces 22d, 22e of the dovetail groove 22. Close contact with appropriate crushing allowance. Therefore, excellent sealing properties can be obtained.
[0024]
In the state where the deepest portions 11a and 12a of the fitting grooves 11 and 12 are closely fitted to the groove shoulders 22a and 22b of the dovetail groove 22, the lip portions 15 and 16 on the outer side of the grooves reduce the compressive force by the second component 3. When it is received, it is deformed so as to open in the radial direction, and swells and intervenes between the facing surfaces 21 and 31 of the first component 2 and the second component 3. For this reason, metal contact between the first component 2 and the second component 3 is prevented.
[0025]
In addition, according to the second embodiment, the lip portions 15 and 16, which are prominent convex portions, bulge out and intervene between the facing surfaces 21 and 31 of the first component 2 and the second component 3, so that the lip portions 15 and 16 at the time of closing are closed. , The facing distance between the first component 2 and the second component 3 is sufficiently maintained, the function of preventing metal contact is further enhanced, and the generation of metal particles and the like can be prevented.
[0026]
Then, with the lip portions 15 and 16 of the seal ring 1 sticking to the facing surface 31 of the second component 3, the second component 3 is opened to the opening 23 from the closed state shown in FIG. 6. When operating in the direction OP, the seal ring 1 also tries to move in the OP direction together with the second component 3, but such movement is caused by the conical inclined surfaces 11 b and 12 b in the fitting grooves 11 and 12 of the seal ring 1. Is prevented by being in close contact with the conical inner side surfaces 22d and 22e of the dovetail groove 22, so that the seal ring 1 is effectively prevented from jumping out and falling out of the dovetail groove 22, and is reliably held in the dovetail groove 22. Can be.
[0027]
【The invention's effect】
According to the dovetail groove seal ring according to the first aspect of the present invention, the seal ring held by the dovetail groove formed on one of the parts has a pair of fitting grooves that can be fitted with the groove shoulder of the dovetail groove. By doing so, it is possible to effectively prevent pop-out due to adhesion or the like to the other component. Also, when the seal ring is compressed between the part in which the dovetail groove is formed and the other part, the fitting groove is closely fitted to the groove shoulder, and the outer part is formed by the facing surface of both parts. Since it bulges out and intervenes, it is possible to prevent contact between the components on both sides, thereby preventing the generation of metal particles and the like.
[0028]
According to the dovetail groove seal ring according to the second aspect of the present invention, when the seal ring is compressed between the part in which the dovetail groove is formed and the other part, the lip portion outside the groove from the fitting groove is formed. Since the parts are deformed so as to open and are interposed between the opposing surfaces of the two parts, the effect of preventing the parts on both sides from contacting each other and thus preventing the generation of metal particles and the like can be realized more reliably.
[Brief description of the drawings]
FIG. 1 is a half sectional view showing a preferred first form of a dovetail groove seal ring according to the present invention by cutting along a plane passing through an axis thereof.
FIG. 2 is a partial cross-sectional view showing a state in which the seal ring according to the first embodiment is mounted in a dovetail groove, cut along a plane passing through the axis thereof.
FIG. 3 is a partial cross-sectional view showing a state in which the seal ring according to the first embodiment is axially compressed between members on both sides thereof, cut along a plane passing through an axis.
FIG. 4 is a half sectional view showing a second form of the dovetail groove seal ring according to the present invention, cut along a plane passing through the axis thereof.
FIG. 5 is a partial cross-sectional view showing a state where the seal ring according to the second embodiment is mounted in a dovetail groove, cut along a plane passing through the axis thereof.
FIG. 6 is a partial cross-sectional view showing a state where the seal ring according to the second embodiment is compressed in the axial direction between members on both sides thereof, cut along a plane passing through the axis.
FIG. 7 is a cross-sectional view showing a mounting structure of an O-ring in a dovetail groove according to a conventional technique, cut along a plane passing through an axis thereof.
FIG. 8 is a cross-sectional view showing a mounting structure of an O-ring in a dovetail groove according to another conventional technique, cut along a plane passing through the axis thereof.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Seal ring 11,12 Fitting groove 11a, 12a Deepest part 11b, 12b Conical inclined surface 13,14 Convex surface 15-18
2 First component 22 Dovetail grooves 22a, 22b Groove shoulder 22c Groove bottom 22d, 22e Inner surface 23 Opening 3 Second component 31 Opposing surface

Claims (2)

A seal ring (1) made of a rubber-like elastic material and held in a dovetail groove (22) formed in one of the parts (2, 3) opposed to each other. A pair of fitting grooves (11, 12) capable of fitting with the groove shoulders (22a, 22b) of the dovetail groove (22) are formed on both sides in the radial direction outside the groove, and the deepest part of the grooves (11, 12) is formed. Are located outside the groove shoulders (22a, 22b) in an initial state. The portions inside the dovetail groove (22) from the fitting grooves (11, 12) form lip portions (17, 18) that can be in close contact with the groove bottom (22c) of the dovetail groove (22), respectively. The dovetail groove, wherein portions outside the dovetail groove (22) from the fitting grooves (11, 12) form lip portions (15, 16) that can be in close contact with the other component (3), respectively. Seal ring.

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