JP2008014388A - Assembling method of sealing construction body using o-ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling method of a sealing construction body using an O-ring capable of improving insertion property at the time of inserting a member with the O-ring fit in to a circular groove. <P>SOLUTION: In the O-ring 10 to be used, a lubricant filling groove 11a is formed for assembly having an opening at a pressure welding part in an outer circumference surface with an inner surface of the circular groove 31 of a second member 30. After filling lubricant 12 for assembly in the lubricant filling groove 11a for assembly of the O-ring 10, the O-ring 10 is fit to an O-ring arranging groove 22 and then a first member 20 with the O-ring 10 fit in the O-ring arranging groove 22 is inserted into the circular groove 31 of the second member 30 in a state that the lubricant 12 for assembly is filled in the lubricant filling groove 11a for assembly of the O-ring 10. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for assembling a seal structure using an O-ring.

The O-ring is used as a sealing material for stationary (fixing) or reciprocating motion (Patent Document 1, etc.). In an O-ring with poor self-lubricity, the insertion load is reduced as follows. First, as shown in FIG. 11A, oil or the like is applied as a lubricant 101 to the surface of the O-ring 100. Then, as shown in FIG. 11 (b), this is fitted into the groove 111 of the cylindrical member 110, and then the cylindrical member 110 into which the O-ring 100 is fitted is inserted into the circular groove 121 of the member 120 for easy insertion. ing.
JP 2005-331060 A

  However, as described with reference to FIG. 11, by simply applying the lubricant 101 to the surface of the O-ring 100 having poor self-lubricity, the cylindrical member 110 in which the O-ring 100 is fitted is repeatedly formed in the circular groove 121 of the member 120. Then, the lubricant 101 adheres to the member 120 side and is removed from the O-ring 100. Therefore, there is a problem that repetitive insertion properties are poor. Further, when the lubricant 101 is applied to the surface of the O-ring 100 and left for a long time, the lubricant 101 is dripped, and this sagging causes a deterioration in insertability.

  The present invention has been made paying attention to the above-mentioned problems, and the object thereof is a seal using an O-ring that can improve the insertability when a member fitted with an O-ring is inserted into a circular groove. The object is to provide a method for assembling a structure.

  In order to solve the above-mentioned problem, in the invention according to claim 1, as the O-ring, an assembly-lubricant-filled groove that opens at a pressure contact portion with the inner surface of the circular groove of the second member on the outer peripheral surface is formed. In the second step, the first member in which the O-ring is fitted in the O-ring arrangement groove in the state in which the assembly lubricant is filled in the assembly ring-filling groove of the O-ring is used as the second step. The gist is that it is inserted into the circular groove of the member.

  In the invention according to claim 2, as the O-ring, an O-ring in which an assembly lubricant filling groove that opens at a pressure contact portion with the inner surface of the circular groove of the second member on the outer peripheral surface is formed is used. After the assembly lubricant is filled inside the lubricant filling groove, the O-ring is fitted into the O-ring arrangement groove in the first step, and subsequently, in the second step, the assembly lubricant filling groove of the O-ring is filled. The gist of the invention is that the first member having the O-ring fitted in the O-ring arrangement groove is inserted into the circular groove of the second member while the assembly lubricant is filled therein.

  In the invention according to claim 3, as the O-ring, an O-ring having an assembly lubricant filling groove that opens at the pressure contact portion with the inner surface of the circular groove of the second member on the outer peripheral surface is used. After fitting into the O-ring arrangement groove in one step, the assembly lubricant filling groove is filled into the O-ring assembly lubricant filling groove. Subsequently, in the second step, the assembly lubricant filling of the O-ring is filled. The gist of the invention is that the first member, in which the O-ring is fitted in the O-ring arrangement groove, is inserted into the circular groove of the second member in a state in which the assembly lubricant is filled in the groove.

  According to the first, second, and third aspects of the invention, the assembly lubricant filling groove formed on the outer peripheral surface of the O-ring is filled with the assembly lubricant, and the O-ring is placed in the O-ring arrangement groove. The fitted first member is inserted into the circular groove of the second member. At this time, the load can be reduced by the assembly lubricant inside the assembly lubricant filling groove.

  Here, the assembly lubricant is filled not in the arc-shaped outer peripheral surface of the O-ring but in the assembly-lubricant filling groove, and the first member fitted with the O-ring is held in a circular shape. Insertability when inserting into the groove can be improved. Moreover, the load at the time of repeatedly inserting the 1st member which inserted the O-ring with the assembly lubricant inside the assembly lubricant filling groove formed in the outer peripheral surface of the O-ring can be reduced. That is, even after the insertion, the assembly lubricant remains in the assembly lubricant filling groove, and even when the first member fitted with the O-ring is repeatedly inserted into the circular groove, the assembly lubrication is repeatedly performed. It can be avoided that the adhesive adheres to the second member side of the mounting partner and the assembly lubricant disappears, and the insertability when the first member fitted with the O-ring is repeatedly inserted into the circular groove can be improved. .

  In the method for assembling a seal structure using an O-ring according to any one of claims 1 to 3, the lubricant filling groove for assembly is continuous over the entire circumference of the O-ring. If it is formed in an annular shape, it becomes possible to fill a large amount of assembly lubricant.

  In addition, as described in claim 5, in the assembly method of the seal structure using the O-ring according to any one of claims 1 to 3, the assembly-filling lubricant filling groove includes all of the O-ring. When a plurality of rings are continuously formed around the circumference, it is possible to fill a larger amount of the assembly lubricant.

  6. The method for assembling a seal structure using an O-ring according to claim 4 or 5, wherein an outer peripheral surface of the O-ring extends in a radial direction and the assembly lubrication is performed. If the communication groove intersecting with the agent filling groove is formed, a large amount of assembly lubricant can be filled.

  The assembly method for assembling a seal structure using the O-ring according to claim 1, wherein the O-ring is opened at a pressure contact portion between the outer peripheral surface and the bottom surface of the O-ring arrangement groove. In the first step, the O-ring is fitted into the O-ring arrangement groove in a state where the lubricant filling groove is further formed and the assembly lubricant filling groove is filled with the assembly lubricant. Good. Further, in the method of assembling a seal structure using the O-ring according to claim 2, the O-ring is opened at a pressure contact portion with the bottom surface of the O-ring arrangement groove on the outer peripheral surface. The assembly lubricant filling groove to be further formed is used, and the assembly lubricant filling groove is filled with the assembly lubricant, and the O-ring is changed to the O-ring arrangement groove in the first step. You may make it fit.

  According to the invention described in claims 7 and 8, the O-ring arrangement of the first member is caused by the assembly lubricant filled in the assembly lubricant filling groove that opens at the pressure contact portion with the bottom surface of the O-ring arrangement groove. The O-ring can be easily fitted in the groove.

  According to a ninth aspect of the present invention, in the assembly method of the seal structure using the O-ring according to the seventh or eighth aspect, the assembly-lubricant-filling groove that opens at a pressure contact portion with the bottom surface of the O-ring arrangement groove is If it is formed in an annular shape continuously over the entire circumference of the O-ring, it becomes possible to fill a large amount of assembly lubricant.

  According to a tenth aspect of the present invention, in the assembly method of the seal structure using the O-ring according to the seventh or eighth aspect, the assembly lubricant filling groove that opens at a pressure contact portion with the bottom surface of the O-ring arrangement groove is If a plurality of O-rings are continuously formed in an annular shape and continuously, a larger amount of assembly lubricant can be filled.

  In the method for assembling a seal structure using the O-ring according to any one of claims 1 to 10, the O-ring may be a stationary O-ring.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, an embodiment of the invention will be described with reference to the drawings.
FIG. 1 shows a seal structure using a stationary O-ring 10 in this embodiment. In this seal structure, the space between the outer peripheral surface 21 of the first member 20 and the inner surface of the circular groove 31 of the second member 30 is sealed by the O-ring 10.

  The first member 20 is a cylindrical member, and an O-ring arrangement groove 22 is formed on the outer peripheral surface 21. The O-ring arrangement groove 22 is a concave line and is formed in an annular shape on the outer peripheral surface 21 of the first member (columnar member) 20. The O-ring 10 is fitted in the O-ring arrangement groove 22. The second member 30 is a cylindrical member and has a circular groove 31. The inner diameter of the circular groove 31 of the second member (cylindrical member) 30 is slightly larger than the outer diameter of the first member (columnar member) 20. The O-ring 10 is disposed between the outer peripheral surface 21 of the first member 20 and the inner surface of the circular groove 31 of the second member 30, and the O-ring 10 is the circular groove of the outer peripheral surface 21 of the first member 20 and the second member 30. Compressed and deformed between the inner surface of 31 and hermetically sealed (sealed) between the two.

FIG. 2A shows a plan view of the O-ring 10, and FIG. 2B shows a cross-sectional view of the O-ring 10 along the line AA in FIG. 2A.
In FIG. 2, the O-ring 10 is made of an elastic material having a circular cross section. Lubricant filling grooves 11 a and 11 b for assembly are formed on the outer peripheral surface of the O-ring 10. The assembly lubricant filling groove 11a is formed at a pressure contact portion with the inner surface of the circular groove 31 (see FIG. 1) of the second member 30, and is opened at the pressure contact portion with the inner surface of the circular groove 31 of the second member 30. is doing. On the other hand, the assembly lubricant filling groove 11b is formed at a pressure contact portion with the bottom surface of the O-ring arrangement groove 22 (see FIG. 1) of the first member 20, and the bottom surface of the O-ring arrangement groove 22 of the first member 20. It is opened at the pressure contact part. The grooves 11a and 11b are formed on the surface of the O-ring in the O-ring forming process.

Next, a method for assembling the seal structure using the O-ring 10 will be described with reference to FIGS.
As shown in FIG. 3B, the assembly lubricant 12 is applied to the O-ring 10 shown in FIG. Then, the O-ring 10 is fitted into the O-ring arrangement groove 22 of the first member (cylindrical member) 20 as shown in FIG. Subsequently, as shown in FIG. 1, the first member 20 fitted with the O-ring 10 is inserted into the circular groove 31 of the second member 30.

  As described above, as a method for assembling the seal structure using the O-ring, the first step of fitting the O-ring 10 into the O-ring disposition groove 22 formed in an annular shape on the outer peripheral surface 21 of the first member 20; The first member 20 in which the O-ring 10 is fitted into the ring arrangement groove 22 is inserted into the circular groove 31 of the second member 30, and the outer peripheral surface 21 of the first member 20 and the inner surface of the circular groove 31 of the second member 30 are inserted. A second step of sealing the gap with an O-ring 10.

  Here, in FIG. 3 (b), as shown in FIG. 4 (a), which is an enlarged view thereof, the assembly lubricant 12 is filled into the assembly lubricant filling grooves 11a and 11b of the O-ring 10. Specifically, the assembly lubricant 12 enters the assembly lubricant filling grooves 11 a and 11 b formed on the outer peripheral surface by applying the assembly lubricant 12 to the outer peripheral surface of the O-ring 10. That is, the assembly lubricant 12 such as oil applied to the surface of the O-ring 10 enters the assembly lubricant filling grooves 11a and 11b by surface tension. In this state, as shown in FIG. 3C, the O-ring 10 is fitted into the O-ring arrangement groove 22. Specifically, it is as shown in FIG. Subsequently, the first member 20 fitted with the O-ring 10 is inserted into the circular groove 31 of the second member 30. At this time, the load at the time of insertion by the assembly lubricant 12 in the assembly lubricant filling groove 11a. Can be reduced. Further, the lubricant (lubricant) 12 remains in the assembly lubricant filling groove 11a even after the insertion. Therefore, even when it is repeatedly inserted, it is possible to prevent the lubricant (lubricant) 12 from adhering to the second member 30 on the other side of the attachment and the lubricant (lubricant) 12 from being lost.

  Further, in the case of FIG. 11, when the lubricant 101 is applied to the surface of the O-ring 100 and left for a long time, the lubricant 101 is dripped, and this dripping causes deterioration of insertability. On the other hand, in this embodiment, the oil (12) is trapped by the surface tension in the assembly lubricant filling groove 11a, and the insertability is excellent.

  In this way, when the assembly lubricant filling groove 11a is formed in the O-ring 10, the oil (12) is trapped by the surface tension in the assembly lubricant filling groove 11a and left for a long time after application. The insertability can be improved, and the oil (12) can be left in the assembly lubricant filling groove 11a even after being inserted once, so that the insertability can be improved repeatedly.

  Further, the assembly lubricant filling groove 11b is filled with the assembly lubricant filling groove 11b by forming the assembly lubricant filling groove 11b in the O ring 10, and the O ring arrangement groove 22 of the first member 20 is filled with the O ring. 10 can be easily fitted. Specifically, in the case of FIG. 11, the lubricant 101 is likely to drip after the lubricant 101 is applied to the surface of the O-ring 100, and it may be difficult to fit the O-ring 100 into the groove 111 of the cylindrical member 110. In the embodiment, the oil (12) is trapped by the surface tension in the assembly lubricant filling groove 11b, and the O-ring 10 can be easily fitted in the O-ring arrangement groove 22 of the first member 20.

  With respect to the assembly lubricant filling grooves 11a and 11b formed on the outer peripheral surface of the O-ring 10, in this embodiment, as shown in FIG. 2, the assembly lubricant filling groove 11a that makes one round of the surface of the O-ring 10 is provided. , 11b. Thereby, more lubricant 12 can be filled and insertion property can be improved.

According to the above embodiment, the following effects can be obtained.
(1) As the O-ring 10, one having an assembly lubricant filling groove 11 a that opens at the pressure contact portion with the inner surface of the circular groove 31 of the second member 30 on the outer peripheral surface is used. The first member 20 in which the O-ring 10 is fitted into the O-ring disposing groove 22 in the state where the assembling lubricant-filling groove 11 a is filled with the assembling lubricant 12 is formed into the circular groove 31 of the second member 30. Inserted. Specifically, as the O-ring 10, an O-ring 10 having an assembly lubricant filling groove 11 a opened at a pressure contact portion with the inner surface of the circular groove 31 of the second member 30 on the outer peripheral surface is used. After the assembly lubricant 12 is filled in the lubricant filling groove 11a, the O-ring 10 is fitted into the O-ring arrangement groove 22 in the first step, and then in the second step, the assembly lubricant for the O-ring 10 is assembled. The first member 20 in which the O-ring 10 is fitted in the O-ring arrangement groove 22 is inserted into the circular groove 31 of the second member 30 with the assembly lubricant 12 filled in the filling groove 11a.

  Thus, the first member 20 in which the O-ring 10 is fitted into the O-ring arrangement groove 22 in a state where the assembly lubricant filling groove 11a formed on the outer peripheral surface of the O-ring 10 is filled. Is inserted into the circular groove 31 of the second member 30. At this time, the load can be reduced by the assembly lubricant 12 inside the assembly lubricant filling groove 11a. Here, the assembly lubricant 12 is filled not in the arc-shaped outer peripheral surface of the O-ring 10 but in the assembly lubricant filling groove 11a, so that the assembly lubricant 12 is held more securely and the O-ring 10 is fitted. Insertability when inserting the one member 20 into the circular groove 31 can be improved.

  Further, the load when the first member 20 in which the O-ring 10 is fitted by the assembly lubricant 12 inside the assembly lubricant filling groove 11 a formed on the outer peripheral surface of the O-ring 10 is repeatedly inserted into the circular groove 31. Can be reduced. That is, even after the insertion, the assembly lubricant 12 remains inside the assembly lubricant filling groove 11a, and when the first member 20 into which the O-ring 10 is fitted is repeatedly inserted into the circular groove 31, The assembly lubricant 12 is prevented from adhering to the second member 30 side to be attached due to repetition, and the assembly lubricant 12 is eliminated, and the first member 20 fitted with the O-ring 10 is repeatedly inserted into the circular groove 31. The insertability when doing so can be improved.

(2) Since the assembly lubricant filling groove 11a is continuously formed in an annular shape over the entire circumference of the O-ring, a large amount of assembly lubricant 12 can be filled.
(3) As the O-ring 10, an assembly-lubricant filling groove 11 b that is further formed on the outer peripheral surface at the press-contact portion with the bottom surface of the O-ring arrangement groove 22 is used. In the first process, the O-ring 10 was fitted into the O-ring arrangement groove 22 with the assembly lubricant 12 filled therein. Specifically, as the O-ring 10, an assembly lubricant filling groove 11 b opened at a pressure contact portion with the bottom surface of the O-ring arrangement groove 22 on the outer peripheral surface is further used. The O-ring 10 was fitted into the O-ring arrangement groove 22 in the first step in a state where the assembly lubricant 12 was filled in the assembly lubricant filling groove 11b together with the inside. In this way, the O-ring 10 can be easily fitted into the O-ring arrangement groove 22 of the first member 20 by the assembly lubricant 12 filled in the assembly lubricant filling groove 11b. In addition, since the assembly lubricant filling groove 11b is continuously formed in an annular shape over the entire circumference of the O-ring 10, a large amount of assembly lubricant 12 can be filled.

In addition, you may change the said embodiment as follows.
As for the grooves formed on the outer peripheral surface of the O-ring 10, two assembly lubricant filling grooves 11a and 11b are formed in FIG. 2, but three or more grooves 15a to 15j are formed as shown in FIG. May be. That is, the mounting lubricant filling grooves (15a to 15e) replacing the groove 11a and the mounting lubricant filling grooves (15f to 15j) replacing the groove 11b are formed in an annular shape continuously over the entire circumference of the O-ring. It is good also as what is formed. By increasing the number of grooves, the amount of lubricant retained can be increased (more assembly lubricant 12 can be filled).

  Further, as shown in FIG. 6 instead of FIG. 2, a communication groove 16 that extends in the radial direction and intersects the assembly lubricant filling grooves 11 a and 11 b may be formed on the outer peripheral surface of the O-ring 10. By forming grooves in a striped pattern in this way, it becomes possible to fill a large amount of the assembly lubricant 12. In particular, when a plurality of communication grooves 16 are formed at equal intervals in the circumferential direction, it is possible to fill the assembly lubricant 12 more. The communication groove 16 may be formed in the case of FIG.

Further, as shown in FIG. 7, the assembly lubricant filling grooves 15 a to 15 j may be formed by forming the protrusions 19.
In the above description, as a procedure for assembling the seal structure, (i) the assembly lubricant filling grooves 11a and 11b of the O-ring 10 are filled with the assembly lubricant 12; The ring 10 is fitted into the O-ring arrangement groove 22 of the first member 20, and (iii) the first member 20 is inserted into the circular groove 31 of the second member 30. Alternatively, the following may be used.

  As shown in FIG. 8, after the O-ring 10 is fitted into the O-ring placement groove 22 in the first step, the assembly lubricant is placed inside the assembly lubricant filling groove 11a of the O-ring 10 as shown in FIG. In the second step, the assembly lubricant filling groove 11a of the O-ring 10 is filled with the assembly lubricant 12 in the second step, as shown in FIG. The first member 20 fitted with the O-ring 10 may be inserted into the circular groove 31 of the second member 30. Even if it does in this way, the same effect can be acquired. In particular, if an O-ring without an assembly lubricant filling groove 11a is used and a lubricant is applied to the surface of the O-ring before fitting into the O-ring arrangement groove 22, the lubricant 12 is likely to drip and the insertability is likely to deteriorate. By inserting the assembly lubricant 12 after fitting the O-ring 10 into the O-ring arrangement groove 22, the insertion property when the first member 20 fitted with the O-ring 10 is inserted into the circular groove 31 is improved. Can be made.

Sectional drawing of the seal structure using the stationary O-ring in this embodiment. (A) is a top view of an O-ring, (b) is sectional drawing of the O-ring in the AA line of (a). (A) is sectional drawing of an O-ring, (b) is sectional drawing in the state which apply | coated the lubricant to O-ring, (c) is sectional drawing in the state which fitted the O-ring in the groove | channel. (A) is sectional drawing in the state which apply | coated the lubricant to O-ring, (b) is sectional drawing in the state which fitted the O-ring in the groove | channel. (A) is sectional drawing of an O-ring of another example, (b) is sectional drawing in the state which fitted the O-ring of another example in the groove | channel. (A) is a top view of the O-ring of another example, (b) is sectional drawing of the O-ring in the AA line of (a). (A) is sectional drawing of an O-ring of another example, (b) is sectional drawing in the state which fitted the O-ring of another example in the groove | channel. Sectional drawing for demonstrating the assembly method of the seal structure using another O-ring. Sectional drawing for demonstrating the assembly method of the seal structure using another O-ring. Sectional drawing for demonstrating the assembly method of the seal structure using another O-ring. (A) is sectional drawing of the O-ring for demonstrating background art, (b) is sectional drawing of the seal structure using an O-ring.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... O-ring, 11a ... Lubricant filling groove for assembly, 11b ... Lubricant filling groove for assembly, 12 ... Lubricant for assembly, 15a-15j ... Groove, 16 ... Communication groove, 20 ... First member, 21 ... Outer circumference Surface, 22 ... O-ring arrangement groove, 30 ... second member, 31 ... circular groove.

Claims (11)

A first step of fitting the O-ring (10) into an O-ring arrangement groove (22) formed in an annular shape on the outer peripheral surface (21) of the first member (20);
The first member (20) in which the O-ring (10) is fitted in the O-ring arrangement groove (22) is inserted into the circular groove (31) of the second member (30), and the outer peripheral surface of the first member (20). A second step of sealing between (21) and the inner surface of the circular groove (31) of the second member (30) by an O-ring (10);
In the assembly method of the seal structure using the O-ring having
As the O-ring (10), an assembly lubricant filling groove (11a) that opens at a pressure contact portion with the inner surface of the circular groove (31) of the second member (30) on the outer peripheral surface is used. In the second step, the assembly lubricant filling groove (11a) of the O-ring (10) is filled with the assembly lubricant (12), and the O-ring (22) is inserted into the O-ring (22). 10. A method for assembling a seal structure using an O-ring, wherein the first member (20) fitted with 10) is inserted into the circular groove (31) of the second member (30). A first step of fitting the O-ring (10) into an O-ring arrangement groove (22) formed in an annular shape on the outer peripheral surface (21) of the first member (20);
The first member (20) in which the O-ring (10) is fitted in the O-ring arrangement groove (22) is inserted into the circular groove (31) of the second member (30), and the outer peripheral surface of the first member (20). A second step of sealing between (21) and the inner surface of the circular groove (31) of the second member (30) by an O-ring (10);
In the assembly method of the seal structure using the O-ring having
As the O-ring (10), an assembly-lubricant filling groove (11a) that opens at a pressure contact portion with the inner surface of the circular groove (31) of the second member (30) on the outer peripheral surface is used. After the assembly lubricant (12) is filled into the assembly lubricant filling groove (11a) of the O-ring (10), the O-ring (10) is formed into the O-ring arrangement groove (22) in the first step. Next, in the second step, the O-ring arrangement groove (22) is filled in the assembly lubricant filling groove (11a) of the O-ring (10) with the assembly lubricant (12). The first member (20) fitted with the O-ring (10) is inserted into the circular groove (31) of the second member (30). Assembly method. A first step of fitting the O-ring (10) into an O-ring arrangement groove (22) formed in an annular shape on the outer peripheral surface (21) of the first member (20);
The first member (20) in which the O-ring (10) is fitted in the O-ring arrangement groove (22) is inserted into the circular groove (31) of the second member (30), and the outer peripheral surface of the first member (20). A second step of sealing between (21) and the inner surface of the circular groove (31) of the second member (30) by an O-ring (10);
In the assembly method of the seal structure using the O-ring having
As the O-ring (10), an assembly-lubricant filling groove (11a) that opens at a pressure contact portion with the inner surface of the circular groove (31) of the second member (30) on the outer peripheral surface is used. After the O-ring (10) is fitted in the O-ring arrangement groove (22) in the first step, the assembly lubricant (12) is placed inside the assembly lubricant filling groove (11a) of the O-ring (10). In the second step, the assembly lubricant filling groove (11a) of the O-ring (10) is filled with the assembly lubricant (12), and the O-ring arrangement groove ( 22) The first member (20) having the O-ring (10) fitted therein is inserted into the circular groove (31) of the second member (30), and the sealing structure using the O-ring Body assembly method. The seal using the O-ring according to any one of claims 1 to 3, wherein the lubricant filling groove (11a) for assembly is formed in an annular shape continuously over the entire circumference of the O-ring. Assembling method of structure. 4. The assembly lubricant filling groove (15 a to 15 e) is formed continuously and annularly over the entire circumference of the O-ring. 5. A method of assembling a seal structure using the O-ring described above. The outer circumferential surface of the O-ring (10) is formed with a communication groove (16) extending in the radial direction and intersecting with the assembly lubricant filling groove (11a). Or a method for assembling a seal structure using the O-ring according to 5; As the O-ring (10), an assembly-lubricant filling groove (11b) opened at a pressure contact portion with the bottom surface of the O-ring arrangement groove (22) on the outer peripheral surface is further used. The O-ring (10) is fitted into the O-ring arrangement groove (22) in the first step in a state where the assembly lubricant (12) is filled in the agent filling groove (11b). A method for assembling a seal structure using the O-ring according to claim 1. As the O-ring (10), an assembly-lubricant filling groove (11b) opened at a pressure contact portion with the bottom surface of the O-ring arrangement groove (22) on the outer peripheral surface is further used. The O-ring (10) is fitted into the O-ring arrangement groove (22) in the first step in a state where the assembly lubricant (12) is also filled in the agent filling groove (11b). A method for assembling a seal structure using the O-ring according to claim 2. The assembly lubricant filling groove (11b) opened at a pressure contact portion with the bottom surface of the O-ring arrangement groove (22) is continuously formed in an annular shape over the entire circumference of the O-ring. Or a method for assembling a seal structure using the O-ring according to 8. A plurality of lubricant filling grooves (15f to 15j) for assembly that are opened at the pressure contact portion with the bottom surface of the O-ring arrangement groove (22) are formed continuously and annularly over the entire circumference of the O-ring. 9. A method of assembling a seal structure using an O-ring according to claim 7 or 8. The method for assembling a seal structure using an O-ring according to any one of claims 1 to 10, wherein the O-ring (10) is a stationary O-ring.

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