JP2021156394A - Seal ring and seal structure - Google Patents

Abstract

To provide a seal ring and a seal structure, capable of reducing fitting resistance at the time when the seal ring is pushed between fitting members.SOLUTION: A seal ring 10A has a structure in which an annular protrusion 21 protrudes from an outer peripheral surface 11B of a cylindrical base 11, and the entire annular protrusion 21 is inclined with respect to an axial direction of the cylindrical base 11. Then, the seal ring 10A is fitted and mounted on the outside of one fitting member 91 of male and female fitting members 91, 95 that are fitted to each other, adheres to the inside peripheral surface of the other fitting member 95, and seals the gap between the peripheral surfaces of both fitting members 91, 95.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a seal ring that is attached to one fitting member of a male and female fitting member that fits each other, adheres to the other fitting member, and seals a gap between the peripheral surfaces of both fitting members. With respect to a seal structure having such a seal ring.

Conventionally, an O-ring widely used as this type of seal ring is accommodated in an O-ring groove formed on the peripheral surface of one of the fitting members, and forms an annular ridge protruding from the peripheral surface. do. Then, it is crushed between the peripheral surfaces of both fitting members to seal the gap (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2000-81177 (Fig. 1)

However, the conventional seal ring such as the O-ring described above has a problem that a large fitting resistance is applied to the fitting operation when the seal ring is pushed between the two fitting members, and the fitting resistance is reduced. There is a need to develop technology to do this.

The invention of claim 1 made to solve the above problems is attached to one of the male and female fitting members to be fitted to each other and is in close contact with the other fitting member, and both of them are fitted to each other. In the seal ring that seals the gap between the peripheral surfaces of the members, a tubular shape is formed, and one of the inner and outer peripheral surfaces thereof is a tubular mounting surface that is in close contact with the peripheral surface of the one fitting member. An annular crest that protrudes from the cylindrical base and the tubular base to the opposite side of the tubular mounting surface, and the tip portion forms an annular shape that is closed around the tubular base and is in close contact with the peripheral surface of the other fitting member. A seal ring comprising an annular protrusion portion as a portion, and at least a part of the annular top portion extending in a direction intersecting the circumferential direction of the tubular base.

The invention of claim 2 is the seal ring according to claim 1, wherein the annular protrusion has a ridge structure extending with a uniform width.

The invention of claim 3 is the seal ring according to claim 1 or 2, which includes a plurality of the annular protrusions.

The invention of claim 4 is the seal ring according to claim 3, further comprising an intersection where the annular protrusions intersect.

The invention of claim 5 is the invention of any one of claims 1 to 4, wherein the annular protrusion is entirely parallel to an imaginary plane inclined with respect to the central axis of the tubular base. It is a seal ring described in.

The invention of claim 6 is the seal ring according to claim 1, wherein the annular protrusion is meandering in the circumferential direction of the tubular base.

The invention of claim 7 is the seal ring according to claim 1, wherein the annular protrusion extends in a semicircular or triangular cross section.

The seal ring according to claim 1, wherein the annular protrusion has a fold shape in which the tip thereof faces one side in the axial direction of the tubular base. Is.

According to a ninth aspect of the present invention, the peripheral surface of the tubular base on the opposite side of the tubular mounting surface has a first tapered surface whose diameter is reduced from the annular top to one end of the tubular base. The seal ring according to claim 1, further comprising a second tapered surface whose diameter is reduced from the top of the annular top toward the other end of the tubular base.

The invention according to claim 10 is the seal ring according to claim 1, wherein both end faces of the cylindrical base are orthogonal to the tubular mounting surface.

The invention of claim 11 is attached to a male and female fitting member that fits each other, an annular groove formed on the peripheral surface of one of the male and female side fitting members, and the annular groove. The seal structure includes the seal ring according to any one of claims 1 to 10, which seals a gap between the peripheral surfaces of the male and female side fitting members.

The seal ring disclosed in claims 1 and 11 has a structure in which an annular protrusion protrudes from one of the inner and outer peripheral surfaces of the tubular base. Then, the seal ring is mounted in a state where the cylindrical mounting surface of the cylindrical base is in close contact with the peripheral surface of one of the male and female fitting members. In this state, when the other fitting member is fitted to one fitting member, the annular protrusion protruding from the tubular base comes into close contact with the peripheral surface of the other fitting member, and both fitting members The gap between the peripheral surfaces is sealed. Here, the annular top, which is the tip of the annular protrusion, forms an annular shape that is closed around the tubular base, and at least a part of the annular top extends in a direction intersecting the circumferential direction of the tubular base. As a result, in the fitting process of both fitting members, the entire annular protrusion is not pushed between both fitting members at once, and is gradually pushed in to disperse the fitting resistance and reduce the fitting resistance. It can be made smaller than before.

The annular protrusion may have a ridge structure extending with a uniform width (claim 2), or the entire opposite side of the tubular mounting surface of the cylindrical base may be projected in a mountain-shaped cross section to form an annular ridge. It may be (Claim 9).

The annular protrusion may be one or a plurality (claim 3), and in the case of a plurality of annular protrusions, the annular protrusions may have a portion where the annular protrusions intersect with each other (claim 4). A plurality of annular protrusions may be compactly grouped in the axial direction of the tubular base. It should be noted that the annular protrusions may intersect with each other so as to cross each other, or may intersect with each other without crossing.

Further, the annular protrusion may have a corrugated shape that meanders in the circumferential direction of the tubular base (claim 6), or may have a simple structure in which the entire annular protrusion is inclined with respect to the central axis of the tubular base. Good (Claim 5). Further, if the above-mentioned simple structure is used, the mold cost for manufacturing the seal ring can be suppressed.

The cross section of the annular protrusion may be semi-circular or triangular (claim 7), or may have any other shape. Further, if the annular protrusion has a fold shape whose tip faces one side in the axial direction of the tubular base as in the seal ring of claim 8, the annular protrusion is pushed from the opposite side of the one side. Since it sometimes easily falls down, the fitting operation can be easily performed by arranging the annular protrusion so as to be easily knocked down in the fitting process of the fitting member.

Further, in the seal ring of claim 10, since both end faces of the tubular base are orthogonal to the tubular mounting surface, it is only necessary to provide a simple step portion on the peripheral surface of the fitting member to which the seal ring is mounted. The seal ring can be positioned with respect to the fitting member.

Perspective view of the seal ring according to the first embodiment of the present disclosure. Side sectional view of the seal structure Perspective view of the seal ring according to the second embodiment Side sectional view of the seal structure Perspective view of the seal ring according to the third embodiment Side sectional view of the seal ring Perspective view of the seal ring according to the fourth embodiment Side sectional view of the seal ring Perspective view of the seal ring according to the fifth embodiment Side sectional view of the seal ring (A) A perspective view of the seal ring of the sixth embodiment, (B) a side view thereof. (A) A perspective view of the seal ring of the seventh embodiment, (B) a side view thereof. (A) perspective view of the seal ring of the eighth embodiment, (B) perspective view of the seal ring of the ninth embodiment. (A) Perspective view of the seal ring of the tenth embodiment, (B) Perspective view of the seal ring of the eleventh embodiment. (A) Side sectional view of the seal ring of the twelfth embodiment, (B) Side sectional view of the seal ring of the thirteenth embodiment, (C) Side sectional view of the seal ring of the fourteenth embodiment. (A) Side sectional view of the seal ring of the fifteenth embodiment, (B) Side sectional view of the mounted state. Cross-sectional view of the annular protrusion according to the modified example of the present disclosure.

[First Embodiment]
Hereinafter, the seal ring 10A of the first embodiment of the present disclosure will be described with reference to FIGS. 1 and 2. The seal ring 10A is, for example, a molded product of an elastomer such as vulcanized rubber or a soft resin, and is provided with an annular protrusion 21 on the outer peripheral surface 11B of the tubular base 11.

The tubular base 11 has, for example, a flat cylindrical shape having a diameter larger than the axial length. Further, both end surfaces 11C of the tubular base 11 form a flat surface orthogonal to the central axis of the tubular base 11, and the inner peripheral surface 11A and the outer peripheral surface 11B of the tubular base 11 and both end surfaces 11C are orthogonal to each other. The corners are R-chamfered. In the first embodiment, the peripheral surface 11A of the cylindrical base 11 corresponds to the "cylindrical mounting surface" in the claims.

The annular protrusion 21 has a ridge structure extending with a uniform width, and its cross-sectional shape is, for example, a semicircle as shown in FIG. 2 (A). Then, as shown in FIG. 1, the annular protrusion 21 forms an annular shape that is closed around the tubular base 11, and the entire surface is an imaginary plane S that is inclined with respect to the central axis of the tubular base 11 (FIG. 2 (FIG. 2). A) It is parallel to). As a result, the annular protrusion 21 is closest to both end faces 11C of the tubular base 11 at two points in the circumferential direction. Further, even at the closest positions, the annular protrusion 21 is slightly displaced from the end surface 11C toward the center side in the axial direction of the tubular base 11. The inner angle portion where the outer surface of the annular protrusion 21 and the outer peripheral surface 11B of the tubular base 11 intersect is R-chamfered.

FIG. 2 shows a seal structure in which the peripheral surfaces of the male and female fitting members 91 and 95 that are fitted to each other are sealed by the seal ring 10A. One fitting member 95 on the female side has, for example, a cylindrical shape, and the other fitting member 91 on the male side is just fitted inside the fitting member 95 on the female side. Further, the fitting member 91 is formed with an annular groove 92 by recessing an intermediate portion in the axial direction in a stepped shape. Further, the outer diameter of the small diameter portion 91B of the fitting member 91 where the annular groove 92 is formed is slightly larger than the inner diameter of the tubular base 11 of the seal ring 10A. Further, the difference in radius between the large diameter portion 91A and the small diameter portion 91B on both sides of the small diameter portion 91B of the fitting member 91 (that is, the depth of the annular groove 92) is the thickness of the tubular base 11 of the seal ring 10A. It is larger than the thickness.

The corner portion between the inner peripheral surface 95A and the end surface 95C of the fitting member 95 is chamfered to form a tapered chamfered surface 95T, and the tip surface 91C and the fitting member 91 of the fitting member 91 are formed. The corners between the two are also Chamfered to form a tapered chamfered surface 91T.

As shown in FIG. 2A, the seal ring 10A is mounted on the other fitting member 91 so that the entire tubular base 11 fits in the annular groove 92, and the annular top which is the tip of the annular protrusion 21. The 21A is in a state of protruding outward from the peripheral surface of the large diameter portion 91A of the fitting member 91. Further, in this state, the seal ring 10A is elastically deformed by the fitting member 91 (specifically, the small diameter portion 91B) so as to slightly expand the diameter, and is brought into close contact with the peripheral surface of the annular groove 92 in the fitting member 91. ing. Then, when one fitting member 95 is fitted to the other fitting member 91, as shown in FIG. 2B, the annular top portion 21A of the annular protrusion 21 is the circumference of the one fitting member 95. It adheres to the surface 95A and seals the gap between the peripheral surfaces of both fitting members 91 and 95.

The description of the structure of the seal ring 10A and the seal structure of the first embodiment has been described above. Next, the action and effect of the first embodiment will be described. The seal ring 10A of the first embodiment is deformed as follows in the fitting process of the fitting members 91 and 95. That is, before the fitting members 91 and 95 are fitted, as shown in FIG. 2A and as described above, the cylindrical base 11 of the seal ring 10A is the annular groove 92 of the other fitting member 91. The annular top portion 21A of the annular protrusion 21 is in a state of protruding from the outer peripheral surface 11B of the other fitting member 91. The entire annular top portion 21A is inclined with respect to the fitting direction of the fitting members 91 and 95. As a result, when one fitting member 95 is fitted to the other fitting member 91, the annular top portion 21A comes into contact with a point in the circumferential direction on the end surface 95C of the fitting member 95. From there, when the fitting members 91 and 95 are deeply fitted (the overlap between the two is increased), a part of the annular protrusion 21 including the annular top portion 21A in the circumferential direction is between the fitting members 91 and 95. Be pushed in. Then, when the fitting members 91 and 95 are further fitted, the annular top portion 21A comes into contact with two points in the circumferential direction on the end surface 95C of the fitting member 95, and finally, the fitting member 95 After the annular top 21A is in contact with a point in the circumferential direction on the end surface 95C, the entire annular protrusion 21 including the annular top 21A fits between the fitting members 91 and 95.

As described above, according to the configuration of the first embodiment, in the process of fitting the fitting members 91 and 95, the entire annular protrusion 21 is pushed between the fitting members 91 and 95 at once. Since there is no such thing and it is pushed in gradually, the fitting resistance is dispersed and the fitting resistance can be made smaller than before. Further, since this effect is obtained by the special structure of the seal ring 10A, no special processing is required for the fitting members 91 and 95. Further, in the seal ring 10A, since the tubular base 11 having a longer shaft length than the O-ring is fitted to the other fitting member 91 and supported by the other fitting member 91, both fitting members 91 In the fitting process of, 95, problems such as being pushed by one fitting member 95 and being rolled up or being displaced with respect to the other fitting member 91 can be suppressed. Further, since the annular protrusion 21 of the seal ring 10A of the first embodiment has a simple elliptical shape, it is possible to reduce the manufacturing cost of the mold for manufacturing the seal ring 10A.

In the first embodiment, the peripheral surface 11A inside the seal ring 10A is fitted to the fitting member 91 (specifically, the small diameter portion 91B) in a slightly expanded and deformed state, and the fitting member 91 Although it was in close contact with the peripheral surface, it was fitted to the fitting member 91 in a state where the seal ring 10A was not deformed, and the seal ring 10A was sandwiched between the fitting members 91 and 95, so that the seal ring 10A May be in close contact with the peripheral surface of the fitting member 91.

[Second Embodiment]
In the seal ring 10B of the second embodiment shown in FIGS. 3 and 4, the annular protrusion 22 protrudes from the inner peripheral surface 11A of the cylindrical base 11 with respect to the seal ring 10A of the first embodiment described above. The difference is that the outer peripheral surface 11B of the tubular base 11 is a "cylindrical mounting surface" within the scope of the claims. Further, FIG. 4 shows a seal structure in which the seal ring 10B is provided between the male and female fitting members 93 and 96.

In this seal structure, an annular groove 97 is formed on the inner peripheral surface 96A of one of the cylindrical fitting members 96 on the female side, and the seal ring 10B is fitted therein. Further, the annular top portion 22A of the annular protrusion 22 projects inward from the peripheral surface 96A inside the fitting member 96. Then, in the fitting process when the other fitting member 93 on the male side shown in FIG. 4B is fitted inside the one fitting member 96, the ring shape is formed as in the first embodiment. The protrusion 22 is gradually pushed between the fitting members 93 and 96 to disperse the fitting resistance, and the fitting resistance can be suppressed as compared with the conventional case.

[Third Embodiment]
The seal ring 10C of the third embodiment is shown in FIGS. 5 and 6, and the cross-sectional shape of the annular protrusion 23 is different from that of the seal ring 10A of the first embodiment described above. Specifically, the cross-sectional shape of the annular protrusion 23 of the seal ring 10C of the third embodiment is triangular, and the annular top 23A is sharp.

[Fourth Embodiment]
The seal ring 10D of the fourth embodiment is shown in FIGS. 7 and 8, and the cross-sectional shape of the annular protrusion 24 is different from that of the seal ring 10A of the first embodiment described above. Specifically, as shown in FIG. 8, the annular protrusion 24 of the seal ring 10D of the fourth embodiment has a tubular shape with its tip facing one side in the axial direction of the tubular base 11. When the base 11 is pushed from the other side in the axial direction, the base 11 is more easily tilted to the tubular base 11 side when pushed from the other side. As a result, the seal ring 10D of the fourth embodiment is mounted on a fitting member (not shown) and is arranged so that the annular protrusion 24 easily falls down when pushed by the mating member on the other side. The mating resistance is dispersed, and the mating resistance can be suppressed as compared with the conventional case.

[Fifth Embodiment]
The seal ring 10E of the fifth embodiment is shown in FIGS. 9 and 10, and an annular protrusion 25 having a mountain-shaped cross section is formed on the entire outer peripheral surface 11B of the tubular base 11. Specifically, the annular top 25A of the annular protrusion 25 has a ridge line 25S, and the ridge line 25S is parallel to an imaginary plane inclined with respect to the central axis of the tubular base 11. The outer peripheral surface 11B of the tubular base 11 has a first tapered surface 11X whose diameter is reduced from the ridge line 25S toward one end of the tubular base 11, and the peripheral surface 11B is reduced from the ridge line 25S toward the other end of the tubular base 11. In connection with the diameter of the second tapered surface 11Y, the entire outer peripheral surface 11B of the tubular base 11 is an annular protrusion 25 having a mountain-shaped cross section. According to the structure of the seal ring 10E of the fifth embodiment, the slope of the annular protrusion 25 toward the annular top 25A becomes gentle, it is easy to be pushed between the peripheral surfaces of the fitting member, and the fitting resistance is small. Become.

[Sixth Embodiment]
The seal ring 10F of the sixth embodiment is shown in FIG. 11, and the point that the annular protrusion 26 faces the seal ring 10A of the first embodiment described above in the circumferential direction of the tubular base 11. different. Specifically, the annular protrusion 26 is smoothly curved like a sine curve, and has a shape including waves for, for example, two cycles on the entire circumference of the tubular base 11. In the explanatory views (FIGS. 11 to 14, 14 and 17) of the sixth embodiment, the following seventh to eleventh embodiments, and the modified examples, "A" is added at the end of the reference numerals of the annular protrusions 26 to 37. 26A to 37A, each of the annular tops 26A to 37A of the annular protrusions 26 to 37, are shown as reference numerals 26A to 37A.

[7th Embodiment]
The seal ring 10G of the seventh embodiment is shown in FIG. 12, and is different from the seal ring 10F of the sixth embodiment described above in that the annular protrusion 27 meanders in a triangular wave shape. Specifically, the upper peak and the lower peak of the triangular wave are alternately arranged at the positions where the tubular base 11 in FIG. 12 (A) is divided into a plurality of equal parts in the circumferential direction, and the upper peaks adjacent to each other are arranged. The annular protrusion 27 extends so as to connect the lower peak and the lower peak at the shortest distance.

[8th Embodiment]
The seal ring 10H of the eighth embodiment is shown in FIG. 13 (A), and a pair of annular protrusions 28 having the same shape as the annular protrusion 21 of the seal ring 10A of the first embodiment described above are parallel to each other. Arranged and prepared.

[9th Embodiment]
The seal ring 10I of the ninth embodiment is shown in FIG. 13B, and has a pair of annular protrusions 29 similar to the seal ring 10H of the eighth embodiment described above, and the pair of annular protrusions 29 thereof. The portions 29 are arranged non-parallel to each other. Further, the pair of annular protrusions 29 are closest to one end surface 11C of the tubular base 11 at the same first position in the circumferential direction of the tubular base 11, and are 180 degrees away from the tubular base 11. It is arranged so as to be closest to the other end face 11C of the tubular base 11 at the same second position in the circumferential direction.

[10th Embodiment]
The seal ring 10J of the tenth embodiment is shown in FIG. 14 (A), and has a pair of annular protrusions 30 like the seal ring 10H of the eighth embodiment described above, and the pair of annular protrusions 30 thereof. The portions 30 intersect at one point in the circumferential direction of the tubular base 11. Specifically, the pair of annular protrusions 30 are symmetrically arranged with an imaginary dividing surface that divides the tubular base 11 into two equal parts in the axial direction, and one of the annular protrusions 30 is the tubular base 11. Of the outer peripheral surface 11B of the above, the entire surface is inclined with respect to the axial direction of the tubular base 11 in a state where substantially the entire surface is accommodated on one end side of the tubular base 11 from the divided surface, and the other annular protrusion 30 is a cylinder. Of the peripheral surface 11B on the outside of the shape base 11, the entire surface is inclined with respect to the axial direction of the cylinder base 11 in a state where substantially the entire surface is contained on the other end side of the cylinder base 11 from the divided surface. Then, a pair of annular protrusions 30 intersect at one point on the dividing surface.

[11th Embodiment]
The seal ring 10K of the eleventh embodiment is shown in FIG. 14 (B), and is provided with a pair of annular protrusions 31 like the seal ring 10K of the tenth embodiment described above, and the pair of annular protrusions 31 thereof. The portions 31 intersect at two points in the circumferential direction of the tubular base 11. Specifically, one of the pair of annular protrusions 31 is entirely inclined with respect to the axial direction of the tubular base 11 as in the case of the annular protrusion 21 of the seal ring 10A of the first embodiment described above. The other annular protrusion 31 has a shape and arrangement that match when one of the annular protrusions 31 is rotated 180 degrees around the central axis of the tubular base 11.

[12th Embodiment]
The seal ring 10L of the twelfth embodiment is shown in FIG. 15A, and in the seal ring 10A of the first embodiment described above, the peripheral surface 11A inside the cylindrical base 11 which is the tubular mounting surface. A contact ridge 41 is formed at a position on the back side of the annular protrusion 21. The contact ridge 41 has, for example, a ridge shape having a semicircular cross section, and the radius of the semicircle is smaller than the radius of the semicircle of the cross section of the annular ridge 21. Then, the contact ridge 41 is brought into close contact with the peripheral surface of the fitting member to which the seal ring 10L is mounted and crushed, and the peripheral surface 11A inside the tubular base 11 is also brought into close contact with the fitting member.

[13th Embodiment]
The seal ring 10M of the thirteenth embodiment is shown in FIG. 15 (B), and like the seal ring 10L of the twelfth embodiment described above, the inner peripheral surface of the cylindrical base 11 which is a cylindrical mounting surface. A contact ridge 42 is provided at a position on the back side of the annular protrusion 21 of 11A. The cross-sectional shape of the contact ridge 42 is an arc surface forming a part of a circle including a semicircle which is the cross-sectional shape of the annular ridge 21.

[14th Embodiment]
The seal ring 10N of the 14th embodiment is shown in FIG. 15C, and is a pair of contact ridges 41 from a position near both ends on the inner peripheral surface 11A of the cylindrical base 11 which is a cylindrical mounting surface. Has an overhanging structure.
[15th Embodiment]
The seal ring 10P of the fifteenth embodiment is shown in FIG. 16, and has a structure in which the annular lip 43 protrudes from both end faces 11C of the tubular base 11 of the seal ring 10A of the first embodiment described above. Further, as shown in FIG. 16B, for example, the seal ring 10P is housed in the annular groove 92 of the fitting member 91 and is used in a state where the annular lip 43 is in close contact with the groove side surface of the annular groove 92. Will be done.

[Other Embodiments]
(1) The cross-sectional shape of the annular protrusion according to the present disclosure is not limited to those illustrated in the above-described first to fifteenth embodiments, and is not limited to those exemplified in the above-described first to fifteenth embodiments, and is circular, elliptical, quadrangular, trapezoidal, polygonal, bowed, and so on. Alternatively, it may be in the form of a part thereof cut out. Specifically, it may have a cross-sectional shape such as the annular protrusions 32 to 37 of the seal ring 10Q to 10V partially illustrated in FIG.

(2) The "annular top" in the present disclosure means "the tip of the annular protrusion". The "tip portion of the annular protrusion" means the portion farthest from the inner peripheral surface of the tubular base when the annular protrusion is formed on the outer peripheral surface of the tubular base, and the annular protrusion. When the portion is formed on the inner peripheral surface of the tubular base, it means the portion farthest from the outer peripheral surface of the tubular base. In other words, the "annular top, which is the tip of the annular protrusion" is located at the position farthest from the peripheral surface of the fitting member to which the seal ring is mounted, and is a mating partner. A portion that comes into close contact with the peripheral surface of a fitting member. Further, the "annular top" may have such a shape as long as it is the "tip of the annular protrusion". For example, the annular top 32A of the annular protrusion 32 shown in FIG. 17 (A). As shown in the above, the cross-sectional shape of the annular top 32A may be round, or the annular tops 33, 35, 37 shown in FIGS. 17 (B), 17 (D), and 17 (F). Like 33A, 35A, 37A, the cross-sectional shapes of the annular tops 33A, 35A, 37A may be flat, or the annular protrusions 34, 36 shown in FIGS. 17 (C) and 17 (E). The cross-sectional shapes of the annular tops 34A and 36A may have irregularities, such as the annular tops 34A and 36A of the above.

(3) In the seal rings 10C to 10N and 10P to 10V of the third to fifteenth embodiments and the modified examples described above, the annular protrusion is provided on the outer peripheral surface 11B of the tubular base 11, but the first embodiment. As in the relationship between the seal ring 10A of the embodiment and the seal ring 10B of the second embodiment, even in the seal rings 10C to 10N and 10P to 10V of the third to fifteenth embodiments, the annular protrusion is inside the tubular base. It may be arranged on the peripheral surface of.

(4) Further, a part or all of the structures of the seal rings 10C to 10N and 10P to 10V of the above-described first to fifteenth embodiments and modifications may be arbitrarily combined.

(5) The annular protrusions 26 and 27 exemplified in the sixth and seventh embodiments described above have a sine wave shape or a triangular wave shape, but may have a rectangular wave shape or a trapezoidal wave shape.

(6) The tubular base 11 of the seal rings 10C to 10N, 10P to 10V of the first to fifteenth embodiments and the modified examples described above has a diameter larger than the shaft length, but vice versa, and the diameter and the shaft. The length may be the same.

(7) The cylindrical base 11 of the seal rings 10C to 10N and 10P to 10V of the first to fifteenth embodiments and the modified examples described above is cylindrical, but may be an elliptical cylinder or a square cylinder.

(8) Both end faces 11C of the tubular base 11 of the seal rings 10A to 10N, 10P to 10V of the first to fifteenth embodiments and the modified examples described above were flat surfaces, but even if they are not flat surfaces. It may be, for example, a tapered surface or an arc surface.

10A-10N, 10P-10V Seal ring 11 Cylindrical base 11A Inner peripheral surface 11B Outer peripheral surface 11C End surface 11X 1st tapered surface 11Y 2nd tapered surface 21-37 Ring protrusion 21A-37A Ring top 91,93 , 95,96 Fitting member 92,97 Ancillary groove

Claims (11)

In a seal ring that is attached to one of the male and female fitting members that are fitted to each other, adheres to the other fitting member, and seals the gap between the peripheral surfaces of both fitting members.
A cylindrical base having a cylindrical shape, one of which is a cylindrical mounting surface in which one of the inner and outer peripheral surfaces is in close contact with the peripheral surface of the one fitting member.
It protrudes from the cylindrical base to the opposite side of the tubular mounting surface, and the tip portion forms an annular shape closed around the tubular base to form an annular top that is in close contact with the peripheral surface of the other fitting member. With an annular protrusion,
A seal ring in which at least a part of the annular top extends in a direction intersecting the circumferential direction of the tubular base. The seal ring according to claim 1, wherein the annular protrusion has a ridge structure extending with a uniform width. The seal ring according to claim 1 or 2, further comprising a plurality of annular protrusions. The seal ring according to claim 3, further comprising an intersection where the annular protrusions intersect. The seal ring according to any one of claims 1 to 4, wherein the annular protrusion is entirely parallel to an imaginary plane inclined with respect to the central axis of the tubular base. The seal ring according to any one of claims 1 to 5, wherein the annular protrusion is meandering in the circumferential direction of the tubular base. The seal ring according to any one of claims 1 to 6, wherein the annular protrusion extends in a semicircular or triangular cross section. The seal ring according to any one of claims 1 to 6, wherein the annular protrusion has a fold shape in which the tip thereof faces one side in the axial direction of the tubular base. The peripheral surface of the tubular base on the opposite side of the tubular mounting surface is a first tapered surface whose diameter is reduced from the annular top to one end of the tubular base, and the tubular base from the annular top. The seal ring according to claim 1, further comprising a second tapered surface whose diameter is reduced toward the other end of the base. The seal ring according to claim 1, wherein both end faces of the cylindrical base are orthogonal to the cylindrical mounting surface. Male and female fitting members that fit each other,
An annular groove formed on the peripheral surface of one of the male and female side fitting members,
A seal structure comprising the seal ring according to any one of claims 1 to 10, which is mounted in the annular groove and seals a gap between the peripheral surfaces of the male and female side fitting members.

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