JP4375522B2 - Dovetail seal ring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal ring that performs sealing by interposing parts facing each other with an appropriate crushing margin, and particularly relates to a seal ring that is suitable for being mounted 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 rotating part such as a housing on the outer periphery, an axial reciprocating part such as a piston and a cylinder, or a part of a valve device such as a valve body and a valve seat. For example, a seal ring formed into a ring shape with a rubber-like elastic material such as an O-ring is often used. 7 and 8 show a conventional sealing structure using an O-ring. The O-ring 101 is formed in a dovetail groove 102b formed on a surface 102a of the one component 102 facing the other component. Is retained. In addition, such a sealing structure is described also in the following patent document 1, for example.
[0003]
[Patent Document 1]
Japanese Utility Model Publication No. 4-127460 (FIG. 1)
[0004]
[Problems to be solved by the invention]
In the conventional technique, the O-ring 101 is held in the dovetail groove 102b in order to prevent dropping. 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 part 103 that faces the part 102 in which the dovetail groove 102b is formed is the same. In the case where the component 103 opens and closes in the direction of contact with and away from the component 102, the O-ring 101 may jump out of the dovetail groove 102b due to adhesion with the component 103 when the component 103 operates in the opening direction OP. There is. Further, since the crushing allowance of the small-diameter O-ring 101 is small, when the component 103 moves in the closing direction CL, the opposing surfaces 102a and 103a of both the components 102 and 103 are likely to be in metal contact with each other, thereby generating particles. It could not be used under conditions that I dislike.
[0005]
In order to prevent metal contact between the parts 102 and 103, as shown in FIG. 8, the O-ring 101 has a wire diameter that is appropriately larger than the opening width of the dovetail groove 102b and is larger than the center of the cross section. It is effective to attach the portion that is appropriately outside so as to be pinched in the X direction between the groove shoulders 102c and 102d of the dovetail groove 102b. However, in this case, when the dovetail groove 102b is assembled, the O-ring 101 has already been subjected to stress caused by compression of the contact portion 101a with the groove bottom of the dovetail groove 102b in the Y direction, and the groove shoulders 102c and 102d. When the contact portions 101b and 101c are compressed in the X direction, the tensile stress in the Y direction generated in the portion 101d therebetween acts in the protruding direction of the O-ring 101. 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 rubber. Moreover, the incorporation into the dovetail groove 102b was also poor.
[0006]
The present invention has been made in view of the above problems, and its technical problem is to effectively prevent the seal ring from popping out of the dovetail and to prevent the members on both sides of the seal ring from contacting each other. It is to prevent.
[0007]
[Means for Solving the Problems]
As means for effectively solving the technical problem described above, the dovetail seal ring according to the invention of claim 1 is held in a dovetail groove formed in one of the parts facing each other and is elastic like rubber. It is a seal ring made of material, and a pair of fitting grooves that can be fitted to the groove shoulders of the dovetail groove are formed on both sides in the radial direction outside the center portion with respect to the axial direction. A conical inclined surface that is located outside the groove shoulder in the state and is in close contact with the inner surface of the dovetail groove in the initial state and a convex surface that is in close contact with the groove bottom of the dovetail groove are formed inside the groove shoulder. It has been done.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of a dovetail seal ring according to the present invention will be described with reference to the drawings. First, FIG. 1 is a half sectional view showing a seal ring according to the first embodiment cut along a plane passing through its axis, 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 shows a state where the seal ring according to the first embodiment is compressed in the axial direction between the members on both sides thereof, cut along the plane passing through the axis. It is a fragmentary sectional view shown.
[0010]
As shown in FIG. 1, the seal ring 1 according to the first embodiment is formed in a ring shape with a rubber-like elastic material, and the cross-sectional shape cut along a plane passing through the axial center is a partially constricted circle. That is, it basically has a shape as an O-ring. As shown in FIG. 2, the seal ring 1 is held in an annular dovetail groove 22 formed along the outer periphery of the opening 23 on one end surface 21 in the axial direction of the first component 2 made of metal. Is.
[0011]
Specifically, the dovetail groove 22 of the first component 2 is inclined in a conical surface so that the groove width on the groove shoulders 22a, 22b side is relatively narrow and the groove width on the groove bottom 22c side is relatively wide. It has a pair of inner side surfaces 22d and 22e. In the seal ring 1, the axial 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 radius of the cross section (φ / 2) is the groove depth. Slightly smaller than D.
[0012]
The seal ring 1 is formed with a pair of fitting grooves 11 and 12 that are continuous in the circumferential direction on both sides in the radial direction. The deepest portions 11a and 12a of the fitting grooves 11 and 12 are located on the axially outer side from the axial center portion (cross-sectional center G) of the seal ring 1, and in the initial mounting state, the groove shoulders 22a and 22a of the dovetail groove 22 are provided. The cone-shaped inclined surfaces 11b and 12b that can be in close contact with the inner side surfaces 22d and 22e of the dovetail groove 22 are formed on the inner side in the axial direction.
[0013]
Therefore, in the initial mounting state shown in FIG. 2, the seal ring 1 is fitted so that the conical inclined surfaces 11 b and 12 b of the fitting grooves 11 and 12 are in close contact with the inner side surfaces 22 d and 22 e of the dovetail groove 22. When the joint 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 protruded to the outside of the dovetail groove 22, and the convex surface on the other side. 14 contacts the groove bottom 22c, and the deepest portions 11a and 12a of the fitting grooves 11 and 12 are appropriately positioned outside the groove shoulders 22a and 22b.
[0014]
Here, as shown in FIG. 3, the second component 3 that is disposed so as to be movable in the axial direction with respect to the first component 2 and closes or opens the opening 23 in the first component 2 is the closing direction CL. In the state where the opening 23 is closed, the convex surface 13 on the outer side of the groove is brought into close contact with the facing surface 31 of the second part 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 that are outside the groove shoulders 22a and 22b of the dovetail groove 22 are, as shown in FIG. By receiving an axial (CL direction) compressive force from the component 3, the groove 14 is closely fitted to the groove shoulders 22a and 22b, and the convex surface 14 on the groove inner side is appropriately crushed on the groove bottom 22c of the dovetail groove 22. Closely in charge. For this reason, the outstanding sealing performance can be show | played.
[0016]
Further, the seal ring 1 has the convex surface 13 on the outer side of the groove from the second part 3 in a state where the deepest portions 11 a and 12 a of the fitting grooves 11 and 12 are closely fitted to the groove shoulders 22 a and 22 b of the dovetail groove 22. When the compression force in the CL direction is received, the portions 13a and 13b that are relatively convex toward the inner peripheral side and the outer peripheral side on the outer side of the fitting grooves 11 and 12 due to the radial stress generated therewith, The first part 2 and the second part 3 are swelled between the opposed surfaces 21 and 31. For this reason, metal contact between the first component 2 and the second component 3 is prevented, and as a result, generation of metal particles and the like can be prevented, so that it can also be used for precision devices that dislike the generation of particles. .
[0017]
When the closed state shown in FIG. 3 is maintained for a relatively long time, the convex surface 13 of the seal ring 1 is opposed to the second part 3 due to the adhesiveness of the rubber-like elastic material in the seal ring 1. The surface 31 may stick. Such adhesion can also occur due to the component of the fluid to be sealed that exists in the opening 23 of the first component 2.
[0018]
Therefore, when the second part 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 a movement is prevented by bringing the conical inclined surfaces 11b and 12b in the fitting grooves 11 and 12 of the seal ring 1 into close contact with the conical inner surfaces 22d and 22e of the dovetail groove 22; The seal ring 1 can be effectively prevented from popping out and falling off from the groove 22, and can be reliably held in the dovetail groove 22.
[0019]
Next, a second embodiment of the dovetail 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 axial center thereof, and FIG. 5 shows a state where the seal ring according to the second embodiment is attached to 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 when the seal ring according to the second embodiment is compressed in the axial direction between members on both sides thereof. It is a fragmentary sectional view cut and shown by.
[0020]
The seal ring 1 according to the second embodiment is also formed in an annular shape with a rubber-like elastic material, and the four lip portions 15 to 18 that are continuous in the circumferential direction have an X-shaped cross section. It has a cross-sectional shape that is similar to a so-called X-ring, and is formed on the one end surface 21 in the axial direction of the first component 2 made of metal along the outer periphery of the opening 23 as shown in FIG. It is held in the annular dovetail 22.
[0021]
Specifically, the seal ring 1 is formed with a pair of fitting grooves 11 and 12 that are continuous in the circumferential direction on both sides in the radial direction, as in the first embodiment. The deepest portions 11a and 12a of the fitting grooves 11 and 12 are located on the axially outer side from the axial central portion of the seal ring 1 and are more axial than the groove shoulders 22a and 22b of the dovetail groove 22 in the initial mounted state. Cone-shaped inclined surfaces 11b and 12b that can be in close contact with the inner side surfaces 22d and 22e of the dovetail groove 22 are formed on the inner side in the axial direction. Further, on the outer side where the fitting grooves 11 and 12 are unevenly distributed, a pair of lip portions that can be brought into close contact with the second component 3 (see FIG. 6) that is opposed to the first component 2 so as to be movable in the axial direction. 15 and 16 are continuously formed in the circumferential direction, and a pair of convex lip portions 17 and 18 are formed on the opposite side so as to be in close contact with the groove bottom 22c of the dovetail groove 22.
[0022]
Therefore, in the initial mounting state shown in FIG. 5, the seal ring 1 is fitted so that the conical inclined surfaces 11 b and 12 b of the fitting grooves 11 and 12 are in close contact with the inner side surfaces 22 d and 22 e of the dovetail groove 22. When the joint 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 protruded to the outside of the dovetail groove 22, and the like. 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 positioned outside the groove shoulders 22a and 22b.
[0023]
Here, as shown in FIG. 6, when the second part 3 moves in the closing direction CL and the opening 23 is closed, the lip portions 15 and 16 of the seal ring 1 have an appropriate crushing allowance. And in 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 11a and 12a of the fitting grooves 11 and 12 that are outside the groove shoulders 22a and 22b of the dovetail groove 22 are the axial directions of the seal ring 1 from the second component 3. (CL direction) By receiving compressive force, the groove shoulders 22a and 22b are closely fitted to each other, and the lip portions 17 and 18 inside the groove are formed on the groove bottom 22c and the inner side surfaces 22d and 22e of the dovetail groove 22. Close with appropriate crushing allowance. For this reason, the outstanding sealing performance can be show | played.
[0024]
In addition, 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 groove exert a compressive force by the second component 3. If it receives, it will deform | transform so that it may open to radial direction, and it will swell and interpose between the opposing surfaces 21 and 31 of the 1st component 2 and the 2nd component 3. FIG. 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 forming the prominent convex portions bulge between the opposing surfaces 21 and 31 of the first component 2 and the second component 3, so that when closed It is possible to sufficiently maintain the facing distance between the first component 2 and the second component 3, further enhance the function of preventing metal contact, and prevent the generation of metal particles and the like.
[0026]
Then, in a state where the lip portions 15 and 16 of the seal ring 1 are adhered 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 operated in the direction OP, the seal ring 1 also tries to move in the OP direction together with the second part 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 coming into close contact with the conical inner side surfaces 22d and 22e of the dovetail groove 22, so that the seal ring 1 can be effectively prevented from jumping out and falling off from the dovetail groove 22 and securely held in the dovetail groove 22. Can do.
[0027]
【The invention's effect】
According to the dovetail seal ring according to the first aspect of the present invention, the pair of fitting grooves that can be fitted to the dovetail groove shoulders are formed on the seal ring held by the dovetail groove formed in one of the parts. As a result, it is possible to effectively prevent popping out due to adhesion or the like with the other component. Also, when the seal ring is compressed between the part where the dovetail is formed and the other part, the fitting groove is closely fitted to the shoulder of the groove, and the outer part is the opposite surface of both parts Since it swells and interposes between them, it is possible to prevent contact between the parts on both sides, and in turn prevent generation of metal particles and the like.
[Brief description of the drawings]
FIG. 1 is a half cross-sectional view showing a first preferred embodiment of a dovetail seal ring according to the present invention, cut along a plane passing through its axis.
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 its axis.
FIG. 3 is a partial cross-sectional view showing a state in which the seal ring according to the first embodiment is compressed in the axial direction between members on both sides of the seal ring by cutting along a plane passing through the axis.
FIG. 4 is a half sectional view showing a second embodiment of the dovetail seal ring according to the present invention by cutting along a plane passing through its axis.
FIG. 5 is a partial cross-sectional view showing a state in which a seal ring according to a second embodiment is mounted in a dovetail groove, cut along a plane passing through its axis.
FIG. 6 is a partial cross-sectional view showing a state in which the seal ring according to the second embodiment is compressed in the axial direction between members on both sides of the seal ring by cutting along a plane passing through the axis.
FIG. 7 is a cross-sectional view showing a conventional structure for mounting an O-ring to a dovetail groove, cut along a plane passing through its axis.
FIG. 8 is a cross-sectional view showing a structure for mounting an O-ring to a dovetail groove according to another prior art, cut along a plane passing through its axis.
[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 Lip part 2 First part 22 Dovetail groove 22a, 22b Groove shoulder 22c Groove bottom 22d, 22e Inner side surface 23 Opening part 3 Second part 31 Opposing surface

Claims (1)

A seal ring (1) made of a rubber-like elastic material held in a dovetail groove (22) formed in one part (2) of the parts (2, 3) facing each other, from a central portion with respect to the axial direction A pair of fitting grooves (11, 12) that can be fitted to the groove shoulders (22a, 22b) of the dovetail groove (22) are formed on both sides in the radial direction on the outer side of the groove, and the deepest portion of the groove (11, 12) Is located outside the groove shoulders (22a, 22b) in the initial state, and is conically inclined to be in contact with the inner side surfaces (22d, 22e) of the dovetail groove (22) in the initial state. A dovetail seal ring, characterized in that a surface (11b, 12b) and a convex surface (14, 17, 18) in close contact with the groove bottom (22c) of the dovetail groove (22) are formed.

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