CN210739368U - Resin seal ring - Google Patents

Abstract

The utility model provides a resin sealing ring, which takes resin as material, can prevent damage when being inserted into a shaft hole, and the opening part can not be combined when being used after being installed; the resin seal ring (10) is mounted in an annular groove (110) provided on the outer periphery of the shaft body (100) to seal the gap between the shaft body (100) and the housing, and has an opening gap (50) between the one opening end portion (30) and the other opening end portion (40), and a temporary holding portion (60) is provided on the one opening end portion (30) and the other opening end portion (40), wherein the temporary holding portion (60) temporarily holds the reduced diameter form of the resin seal ring (10) in a state where the one opening end portion (30) and the other opening end portion (40) are in contact with each other.

Description

Resin seal ring

Technical Field

The utility model relates to a resin sealing ring.

Background

For example, a seal ring is provided in various sealing devices that utilize the fluid pressure of hydraulic oil and seal the hydraulic oil, such as a transmission of a vehicle. The seal ring is mounted in an annular groove provided on the shaft side, for example, in a shaft body or a housing that rotates relative to the shaft body. As such a seal ring, there are, for example, those shown in patent documents 1 and 2.

Patent document 1 discloses the following seal ring: specifically, the groove (14) and the projection (15) are provided and fitted to each other, so that the clearance is kept small from a low temperature to a high temperature, thereby improving the airtightness. Further, patent document 2 discloses a seal ring having a clamping margin and centering irregularities on an adhesive surface.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese Kokai publication 2000-No. 320677

Patent document 2: japanese Kokai and Japanese Kokai publication Sho 62-167966

However, when the seal ring is to be incorporated into the seal device, the seal ring needs to be incorporated into an annular groove of a shaft body of the seal device. In this assembly, the diameter of the seal ring is further increased than when the seal ring is attached to the annular groove, and the shaft body is inserted through the center hole of the seal ring, and then the seal ring is fitted into the annular groove. However, when the diameter of the seal ring is increased, a portion of the seal ring may be plastically deformed. When the plastic deformation occurs, the outer diameter of the seal ring in a free state (the outer diameter of the seal ring in a state where no external force is applied to the seal ring after assembly) becomes larger than the outer diameter of the seal ring in a use state.

When the seal ring is fitted into the annular groove in a state where plastic deformation is generated in the seal ring, the seal ring may have a portion protruding (bulging) from the shaft body. If the protruding portion is present as described above, if the shaft body to which the seal ring is attached is inserted into the hole portion of the housing, interference may occur with the end face of the hole portion. Therefore, when the shaft body is inserted into the shaft hole of the housing, damage such as breakage or scratching of the seal ring may occur. If such breakage or damage occurs, the sealing performance of the seal ring is degraded, and there is a possibility that a failure of the hydraulic circuit may occur.

The seal ring disclosed in patent document 1 is used in a high-temperature environment such as a turbine of an aircraft, and is therefore made of metal, not resin. Therefore, since the area of elastic deformation is large, problems associated with plastic deformation such as those of a resin seal ring are less likely to occur.

Further, in the seal ring assembled to the seal device, since the seal ring is not engaged with each other at the opening portion and has a slight clearance so that one end side and the other end side of the seal ring forming the opening portion can move relative to each other, the diameter of the seal ring is allowed to be slightly increased by the oil pressure of the hydraulic oil in the use state of the seal device. However, the seal ring disclosed in patent document 2 has the following configuration: that is, on the premise of bonding with an adhesive, a clamping margin is provided on the seal ring, or centering irregularities for preventing misalignment (misalignment) of the bonding surface are provided. Therefore, since the seal ring is not formed to have a structure including the opening portion which is not joined and has a slight gap like the seal ring used in the seal device using the hydraulic oil, it is difficult to apply the seal ring as the seal device using the hydraulic oil as described above. In the structure disclosed in patent document 2, since there is a clamping margin, it is difficult to insert the seal ring into the shaft hole of the housing after the seal ring is mounted in the annular groove of the shaft body.

SUMMERY OF THE UTILITY MODEL

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a resin seal ring which can prevent damage from occurring when a shaft hole is inserted, using resin as a material, and which can be used after installation without the opening being combined.

In order to solve the above-described problem, according to a first aspect of the present invention, there is provided a resin seal ring which seals a gap between a shaft body and a housing by being fitted in an annular groove provided on an outer periphery of the shaft body and has an open gap between one open end portion and the other open end portion, the resin seal ring being characterized in that temporary holding portions are provided in the one open end portion and the other open end portion, the temporary holding portions temporarily holding a form in which the resin seal ring is reduced in diameter in a state in which the one open end portion and the other open end portion abut against each other.

In addition, another aspect of the present invention is the above-described utility model, wherein: a convex portion protruding toward one side of the circumferential direction of the resin seal ring is provided at one opening end portion; a concave part for inserting the convex part is arranged on the other opening end part; the convex portion and the concave portion are configured as follows: when the convex portion is inserted into the concave portion, at least a part of the outer surface of the convex portion contacts the inner surface of the concave portion, thereby temporarily retaining the reduced diameter form of the resin seal ring.

In addition, another aspect of the present invention is the above-described utility model, wherein: a first holding piece portion which is provided at one side in the thickness direction of the resin seal ring and a second holding piece portion which is provided at the other opening end portion; the recess is provided between the first clamping piece portion and the second clamping piece portion.

In addition, another aspect of the present invention is the above-described utility model, wherein: a first clamping piece portion which is arranged on one side of the radial direction of the resin sealing ring and a second clamping piece portion which is arranged on the other side of the radial direction are arranged on the other opening end portion; the recess is provided between the first clamping piece portion and the second clamping piece portion.

In addition, another aspect of the present invention is the above-described utility model, wherein: a planar portion parallel to the circumferential direction of the resin seal ring is provided on at least one of the convex portion and the concave portion; the flat surface portion is in frictional contact with the convex portion and the concave portion.

In addition, another aspect of the present invention is the above-described utility model, wherein: a space reducing portion is provided in the concave portion, and the space reducing portion is a portion having a smaller size than other portions of the concave portion; the interval reducing part is in friction contact with the convex part in a state of clamping the convex part.

In addition, another aspect of the present invention is the above-described utility model, wherein: the interval reducing portion is provided with a flat surface portion parallel to the circumferential direction of the resin seal ring.

In addition, another aspect of the present invention is the above-described utility model, wherein: the interval-narrowing portion is provided with a projection portion projecting from an inner wall surface of the recess.

In addition, another aspect of the present invention is the above-described utility model, wherein: a size-enlarged portion provided in the convex portion, the size of the size-enlarged portion being set larger in a direction toward an inner wall surface of the concave portion than in other portions of the convex portion; the enlarged dimension portion is in frictional contact with an inner wall surface of the recess.

In addition, another aspect of the present invention is the above-described utility model, wherein: the enlarged-size portion is provided with a flat surface portion parallel to the circumferential direction of the resin seal ring.

In addition, another aspect of the present invention is the above-described utility model, wherein: the enlarged-size portion is provided with a projection portion projecting from an outer surface of the convex portion.

(effects of utility model)

According to the present invention, a resin seal ring can be provided, which can prevent damage from occurring when the shaft hole is inserted, using resin as a material, and which can be used without the opening being combined after installation.

Drawings

Fig. 1 is a perspective view showing a structure of a seal ring according to an embodiment of the present invention.

Fig. 2 is a partial perspective view showing an enlarged structure of the vicinity of the opening gap of the seal ring shown in fig. 1.

Fig. 3 is a partial perspective view showing a structure in the vicinity of the first opening end portion of the seal ring shown in fig. 1.

Fig. 4 is a partial perspective view showing a structure in the vicinity of the second opening end portion of the seal ring shown in fig. 1.

Fig. 5 is a cross-sectional view showing a state in which the vicinity of the convex portion and the concave portion of the seal ring according to the first configuration example of the present invention is cut in the circumferential direction, and a state before the convex portion is inserted into the space reduction portion.

Fig. 6 is a schematic view showing a state in which the distal end side of the convex portion is inserted into the space reducing portion from the state shown in fig. 5, and the resin seal ring is temporarily held in a reduced diameter state.

Fig. 7 is a cross-sectional view showing a state in which the vicinity of the convex portion and the concave portion of the seal ring according to the second configuration example of the present invention is cut in the circumferential direction, and a state before the convex portion is inserted into the space reduction portion.

Fig. 8 is a schematic view showing a state in which the distal end side of the convex portion is inserted into the space reducing portion from the state shown in fig. 7, and the resin seal ring is temporarily held in a reduced diameter state.

Fig. 9 is a cross-sectional view showing a state in which the vicinity of the convex portion and the concave portion of the seal ring according to the third configuration example of the present invention is cut in the circumferential direction, and a state before the convex portion is inserted into the space reduction portion.

Fig. 10 is a schematic view showing a state in which the distal end side of the convex portion is inserted into the space reducing portion from the state shown in fig. 9, and the resin seal ring is temporarily held in a reduced diameter state.

Fig. 11 is a cross-sectional view showing a state in which the vicinity of the convex portion and the concave portion of the seal ring according to the fourth configuration example of the present invention is cut in the circumferential direction, and a state before the convex portion is inserted into the space reduction portion.

Fig. 12 is a schematic view showing a state in which the distal end side of the convex portion is inserted into the space reducing portion from the state shown in fig. 11, and the resin seal ring is temporarily held in a reduced diameter state.

Fig. 13 is a cross-sectional view showing a state in which the vicinity of the convex portion and the concave portion of the seal ring according to the fifth configuration example of the present invention is cut in the circumferential direction, and is a view showing a state before the convex portion is inserted into the space reduction portion.

Fig. 14 is a schematic view showing a state in which the distal end side of the convex portion is inserted into the space reducing portion from the state shown in fig. 13, and the resin seal ring is temporarily held in a reduced diameter state.

Fig. 15 is a cross-sectional view showing a state in which the convex portion and the vicinity of the concave portion of the seal ring according to the sixth configuration example of the present invention are cut in the circumferential direction, and a state before the enlarged-size portion is inserted into the concave portion.

Fig. 16 is a schematic view showing a state in which the expanded-size portion is inserted into the recess from the state shown in fig. 15, and the reduced diameter resin seal ring is temporarily held.

Fig. 17 is a cross-sectional view showing a state in which the convex portion and the vicinity of the concave portion of the seal ring according to the seventh configuration example of the present invention are cut in the circumferential direction, and a state before the enlarged-dimension portion is inserted into the concave portion.

Fig. 18 is a schematic view showing a state in which the expanded-size portion is inserted into the recess from the state shown in fig. 17, and the reduced diameter form of the resin seal ring is temporarily held.

Fig. 19 is a cross-sectional view showing a state in which the convex portion and the vicinity of the concave portion of the seal ring according to the eighth configuration example of the present invention are cut in the circumferential direction, and a state before the enlarged-dimension portion is inserted into the concave portion.

Fig. 20 is a schematic view showing a state in which the expanded-size portion is inserted into the recess from the state shown in fig. 19, and the reduced diameter resin seal ring is temporarily held.

Fig. 21 is a cross-sectional view showing a state in which the convex portion and the vicinity of the concave portion of the seal ring according to the ninth structural example of the present invention are cut in the circumferential direction, and a state before the enlarged-dimension portion is inserted into the concave portion.

Fig. 22 is a schematic view showing a state in which the expanded-size portion is inserted into the recess from the state shown in fig. 21, and the reduced diameter resin seal ring is temporarily held.

Fig. 23 is a cross-sectional view showing a state in which the convex portion and the vicinity of the concave portion of the seal ring according to the tenth configuration example of the present invention are cut in the circumferential direction, and a state before the enlarged-size portion is inserted into the concave portion.

Fig. 24 is a schematic view showing a state in which the expanded-size portion is inserted into the recess from the state shown in fig. 23, and the reduced diameter resin seal ring is temporarily held.

Fig. 25 is a cross-sectional view showing a state in which the vicinity of the convex portion and the concave portion of the seal ring according to the eleventh configuration example of the present invention is cut in the circumferential direction, and shows a state before the convex portion is inserted into the space reduction portion.

Fig. 26 is a schematic view showing a state in which the distal end side of the convex portion is inserted into the space reducing portion from the state shown in fig. 25, and the resin seal ring is temporarily held in a reduced diameter state.

(symbol description)

10 … sealing ring 20 … ring part

30 … first open end (corresponding to an open end)

31 … thin-wall 32 … convex

33. 34 … notch 35 … size enlarging part

35a … plane portion 35b … projection

36 … tapered enlargement 36a … tapered wall

40 … second open end (corresponding to the other open end)

Recess 42 … of thin-walled portion 41 …

42a … opening 42c … inclined inner wall face

42b … inner wall surface (corresponding to plane part)

43 … clip part (corresponding to the first clip part)

44 … holding piece part (corresponding to the second holding piece part)

45 … notch 50 … opening gap

60 … temporary holding part 61 … space-reduced part

61a … flat surface 61b … tapered guide surface

61c … protrusion 100 … axle body

110 … circular groove L1-L4 … size

Detailed Description

Hereinafter, a resin seal ring 10 and a method of assembling a sealing device according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the axial direction of the resin seal ring 10 is defined as the Z direction. In the resin seal ring 10, the upper side in fig. 1 is a Z1 side, and the opposite lower side is a Z2 side.

[1 ] Overall Structure of resin seal Ring 10 ]

Fig. 1 is a perspective view showing a structure of a resin seal ring 10. In the following description, the resin seal ring 10 is sometimes referred to simply as a seal ring 10. The seal ring 10 shown in fig. 1 is manufactured by, for example, injection molding a predetermined resin. As the resin constituting the seal ring 10 by injection molding, for example, polyamide resin (PA), fluororesin and alloy material thereof, liquid crystal polymer resin (LCP), polyimide resin (PI), polyether ketone resin (PEK), polyarylether ketone resin (PAEK), polyether ketone ether ketone resin (PEKEKK), polyether ether ketone resin (PEEK), and super engineering plastic represented by polyphenylene sulfide resin (PPS) can be used, and Polybenzimidazole (PBI) having high heat resistance can be preferably used.

The seal ring 10 shown in fig. 1 includes an annular portion 20, and a first open end 30 is provided at one end side in the circumferential direction of the annular portion 20. Further, a second open end 40 is provided on the other end side in the circumferential direction of the annular portion 20. Further, the first open end portion 30 corresponds to one open end portion, and the second open end portion 40 corresponds to the other open end portion. However, it is also possible that the first open end portion 30 corresponds to the other open end portion, and the second open end portion 40 corresponds to the one open end portion.

Further, a gap, i.e., an opening gap 50, is provided between the first opening end portion 30 and the second opening end portion 40. That is, the opening gap 50 exists between the first opening end 30, which is one end side in the circumferential direction of the annular portion 20, and the second opening end 40, which is the other end side in the circumferential direction of the annular portion 20. However, the opening gap 50 may be almost absent due to contact between a concave portion and a convex portion, which will be described later.

Fig. 2 is a partial perspective view showing an enlarged structure of the seal ring 10 shown in fig. 1 in the vicinity of the opening gap 50. Fig. 3 is a partial perspective view showing a structure in the vicinity of the first open end 30 of the seal ring 10 shown in fig. 1. Fig. 4 is a partial perspective view showing a structure in the vicinity of the second open end 40 of the seal ring 10 shown in fig. 1.

As shown in fig. 1 to 3, the first opening end 30 is a portion located on one end side of the annular portion 20 and has a thin portion 31 having a radial thickness smaller than that of the annular portion 20. As shown in fig. 1, 2, and 4, the second open end 40 is a portion located on the other end side of the annular portion 20 and has a thin portion 41 having a radial thickness smaller than that of the annular portion 20. As shown in fig. 2, the thin portion 31 is located on the inner diameter side of the thin portion 41.

In addition, the first open end 30 is provided with a projection 32. The protruding portion 32 protrudes outward from the thin portion 31, and a protruding end surface of the protruding portion 32 is provided flush with the outer peripheral surface of the annular portion 20. The protruding portion 32 is provided to be thinner in thickness in the thickness direction along the axial direction than the other portions of the annular portion 20. That is, notch portions 33, 34 recessed in a groove are provided on one end portion side in the circumferential direction of the annular portion 20 and on the outer diameter side of the thin portion 31, and a portion sandwiched between the pair of notch portions 33, 34 is a convex portion 32.

The notch 33 is a portion adjacent to the thin portion 31 on the outer diameter side of the thin portion 31, and is a portion recessed from one side (Z1 side) in the thickness direction (Z direction) toward the other side (Z2 side). The notch 34 is a portion adjacent to the thin portion 31 on the outer diameter side of the thin portion 31, and is a portion recessed from the other side (Z2 side) in the thickness direction (Z direction) toward the one side (Z1 side).

As shown in fig. 2, the second opening end 40 is also provided with a thin portion 41. The thin portion 41 is provided on the outer diameter side of the thin portion 31. The sum of the radial thicknesses of the thin portion 31 and the thin portion 41 is substantially equal to the radial thickness of the annular portion 20.

The thin portion 41 is provided with a recess 42. The recess 42 is a portion that is grooved so as to penetrate the thin-walled portion 41 in the radial direction. Therefore, the thin portion 41 is provided with a pair of holding pieces 43 and 44 so as to hold the recess 42 therebetween. The clamping piece portion 43 is a portion located on one side (Z1 side) in the thickness direction (Z direction) of the recess 42. The holding piece portion 44 is a portion located on the other side (Z2 side) in the thickness direction (Z direction) than the recess 42. Further, the clamping piece portion 43 corresponds to a first clamping piece portion, and the clamping piece portion 44 corresponds to a second clamping piece portion.

In this way, since the recess 42, the clamping piece portion 43, and the clamping piece portion 44 are provided in the thin-walled portion 41 of the second open end portion 40, the appearance of the second open end portion 40 is provided in a fork shape whose tip is bifurcated.

Here, the first opening end 30 and the second opening end 40 are portions fitted to each other. Specifically, the convex portion 32 is inserted into the concave portion 42, and the outer peripheral surface of the thin portion 31 and the inner peripheral surface of the thin portion 41 are abutted against each other, whereby the first open end 30 and the second open end 40 are fitted to each other. In this fitted state, the gap of the opening gap 50 is greatly reduced. However, when the seal ring 10 is mounted in an annular groove of a shaft body described later, the seal ring 10 is expanded in diameter so that the opening gap 50 is expanded.

Further, on the inner diameter side of the thin-walled portion 41 in the second opening end portion 40, a notch portion 45 in a shape recessed in a grooved manner is provided. The notch 45 is adjacent to the thin portion 41 on the inner diameter side of the thin portion 41.

[2 ] specific constitution of seal ring 10 ]

(1) First configuration example of seal ring 10

The specific structure of the seal ring 10 will be described below. First, the seal ring 10 according to the first configuration example will be described. Fig. 5 is a cross-sectional view showing a state in which the vicinities of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the first configuration example are cut in the circumferential direction, and is a view showing a state before the convex portion 32 is inserted into the space reducing portion 61, or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 6 is a schematic view showing a state in which the distal end side of the convex portion 32 is inserted into the space reducing portion 61 from the state shown in fig. 5, and the resin seal ring 10 is temporarily held in a reduced diameter state.

Fig. 5 and 6 show a state in which the resin seal ring 10 is mounted in the annular groove 110 of the shaft body 100 inserted into the shaft hole of the housing of the sealing device (the same applies to fig. 7 to 26 below).

As shown in fig. 5 and 6, the temporary holding portion 60 is provided in the convex portion 32 and the concave portion 42 of the resin seal ring 10. The temporary holding portion 60 is a portion that temporarily holds the reduced diameter form of the resin seal ring 10. Specifically, the space reduction portion 61 having a smaller dimension in the thickness direction (Z direction) than the other portions of the recess 42 is provided on the back side of the recess 42 farthest from the port 42a in the recess 42.

Here, when the dimension in the thickness direction (Z direction) of the convex portion 32 is L1, the dimension in the thickness direction (Z direction) of the concave portion 42 other than the reduced interval portion 61 (facing interval between the clamping piece portion 43 and the clamping piece portion 44) is L2, and the dimension in the thickness direction (Z direction) of the reduced interval portion 61 (facing interval between the clamping piece portion 43 and the clamping piece portion 44 on the back side of the concave portion 42) is L3, the following expression 1 is established.

L2 is more than or equal to L1 is more than L3 … … (formula 1)

However, L1, which is the dimension in the thickness direction (Z direction) of the convex portion 32, is slightly larger than L3, which is the dimension in the thickness direction (Z direction) of the reduced interval portion 61. Specifically, as shown in fig. 6, the tip end side of the convex portion 32 is inserted into the space reducing portion 61, and the reduced diameter form of the resin seal ring 10 is temporarily held in this state. However, in the operating state of the sealing device, as shown in fig. 5, the dimension L1 and the dimension L3 are set so that the tip end side of the convex portion 32 is separated from the space reducing portion 61 by the pressure oil.

Further, the outer surface of the convex portion 32 is provided with a flat surface portion 32a parallel to the circumferential direction of the resin seal ring 10. The reduced interval portion 61 is also provided with a flat surface portion 61a parallel to the circumferential direction of the resin seal ring 10. Therefore, the reduced diameter form of the resin seal ring 10 is temporarily held by the frictional contact between the flat surface portion 32a and the flat surface portion 61 a.

Here, when the relationship of the above expression 1 is established and the distal end side of the convex portion 32 is inserted into the space reducing portion 61 by the elasticity of the holding piece portion 43 and the holding piece portion 44, the state shown in fig. 6 is obtained. That is, the distance between the clamping piece portion 43 and the clamping piece portion 44 is increased so that the dimension L2 in the thickness direction (Z direction) of the recess 42 other than the reduced-distance portion 61 increases from the back side of the recess 42 toward the opening 42a side. Therefore, the distal end side of the convex portion 32 can be relatively easily inserted into the space reducing portion 61, and the resin seal ring 10 is expanded in diameter by the hydraulic pressure of the hydraulic oil in the operating state of the sealing device, whereby the distal end side of the convex portion 32 is easily separated from the space reducing portion 61.

(2) Second configuration example of seal ring 10

Next, a second configuration example of the seal ring 10 will be described. Fig. 7 is a cross-sectional view showing a state in which the vicinities of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the second configuration example are cut in the circumferential direction, and is a view showing a state before the convex portion 32 is inserted into the space reducing portion 61, or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 8 is a schematic view showing a state in which the resin seal ring 10 is temporarily held in a reduced diameter state by inserting the distal end side of the convex portion into the space reducing portion from the state shown in fig. 7.

Similarly to the configuration of the resin seal ring 10 according to the first configuration example, the resin seal ring 10 according to the second configuration example also includes the space reducing portion 61. However, in the resin seal ring 10 according to the second configuration example, the tapered guide surface 61b is provided at the entrance portion of the reduced interval portion 61. The tapered guide surface 61b is a surface for guiding the insertion of the distal end side of the convex portion 32 into the reduced interval portion 61, and is inclined with respect to the thickness direction (Z direction). The tapered guide surface 61b may be planar or curved as long as the insertion of the convex portion 32 into the space reduction portion 61 can be guided satisfactorily (without being studded).

Therefore, it is possible to easily achieve a temporary holding state in which the resin seal ring 10 is temporarily held in a reduced diameter state by inserting the convex portion 32 into the space-reduced portion 61 as shown in fig. 8 from a state before the convex portion 32 is inserted into the space-reduced portion 61 as shown in fig. 7. In the temporary holding state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 32a of the convex portion 32 and the flat surface portion 61a of the reduced interval portion 61.

In the resin seal ring 10 according to the second configuration example, the configuration other than the tapered guide surface 61b is the same as that of the resin seal ring 10 according to the first configuration example, and therefore, the description thereof is omitted.

(3) Third configuration example of seal ring 10

Next, a third configuration example of the seal ring 10 will be described. Fig. 9 is a cross-sectional view showing a state in which the vicinities of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the third configuration example are cut in the circumferential direction, and is a view showing a state before the convex portion 32 is inserted into the space reducing portion 61, or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 10 is a schematic view showing a state in which the distal end side of the convex portion 32 is inserted into the space reducing portion 61 from the state shown in fig. 9, and the resin seal ring 10 is temporarily held in a reduced diameter state.

Similarly to the configuration of the resin seal ring 10 according to the first configuration example, the resin seal ring 10 according to the third configuration example also includes the space reducing portion 61. However, in the resin seal ring 10 according to the third configuration example, the tapered guide surface 32b is provided on the tip end side of the convex portion 32. The tapered guide surface 32b is a surface for guiding the insertion of the distal end side of the convex portion 32 into the reduced interval portion 61, and is inclined with respect to the thickness direction (Z direction). The tapered guide surface 32b may be planar or curved as long as the insertion of the convex portion 32 into the space reduction portion 61 can be guided satisfactorily (without being studded).

Therefore, it is possible to easily achieve a temporary holding state in which the resin seal ring 10 is temporarily held in a reduced diameter state by inserting the convex portion 32 into the space-reduced portion 61 as shown in fig. 10 from a state before the convex portion 32 is inserted into the space-reduced portion 61 as shown in fig. 9. In the temporary holding state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 32a of the convex portion 32 and the flat surface portion 61a of the reduced interval portion 61.

In the resin seal ring 10 according to the third configuration example, the configuration other than the tapered guide surface 32b is the same as that of the resin seal ring 10 according to the first configuration example, and therefore, the description thereof is omitted.

(4) Fourth configuration example of the seal ring 10

Next, a fourth configuration example of the seal ring 10 will be described. Fig. 11 is a cross-sectional view showing a state in which the vicinities of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the fourth configuration example are cut in the circumferential direction, and is a view showing a state before the convex portion 32 is inserted into the space reducing portion 61, or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 12 is a schematic view showing a state in which the distal end side of the convex portion 32 is inserted into the space reducing portion 61 from the state shown in fig. 11, and the resin seal ring 10 is temporarily held in a reduced diameter state.

In the resin seal ring 10 according to the fourth structural example, the shape of the reduced interval portion 61 is different from the reduced interval portions 61 according to the first to third structural examples. Specifically, the space reducing portion 61 is provided with a protrusion portion 61c instead of the flat surface portion 61 a. The protrusion 61c is a portion protruding from the inner wall surface 42b of the recess 42. In the configuration shown in fig. 11 and 12, the protrusion 61c protruding from the inner wall surface 42b on one side (Z1 side) in the thickness direction (Z direction) of the recess 42 and the protrusion 61c protruding from the inner wall surface 42b on the other side (Z2 side) in the thickness direction (Z direction) are provided so as to face each other. Therefore, by one projection 61c facing the other projection 61c, in the reduced interval portion 61, a dimension L3 in the thickness direction (Z direction) of the reduced interval portion 61 is set smaller than a dimension L1 in the thickness direction (Z direction) of the convex portion 32. Further, in the circumferential direction of the inner wall surface 42b, the protrusion 61c is provided at the following position. That is, in the reduced diameter form of the resin seal ring 10, the tip end side of the convex portion 32 is positioned on the reduced interval portion 61, and the protrusion portion 61c is in contact with the flat surface portion 32 a. However, in the operating state of the sealing device, the protrusion 61c is provided at the following positions: that is, the resin seal ring 10 is expanded in diameter from the reduced diameter state by the hydraulic pressure of the hydraulic oil, and the protrusion 61c is not in contact with the flat surface portion 32 a.

With the above configuration, it is possible to easily change from the state before the convex portion 32 is inserted into the space-reduced portion 61 (between the pair of protrusions 61 c) as shown in fig. 11 to the temporarily-retained state in which the convex portion 32 is inserted into the space-reduced portion 61 (between the pair of protrusions 61 c) to temporarily retain the reduced diameter resin seal ring 10 as shown in fig. 12. In the temporary holding state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 32a of the convex portion 32 and the protruding portion 61 c.

The resin seal ring 10 according to the fourth configuration example is different from the resin seal ring 10 according to the first configuration example in that the projection portion 61c is provided instead of the flat surface portion 61a, but the configuration other than this is the same as the resin seal ring 10 according to the first configuration example, and therefore, the description thereof is omitted.

(5) Fifth configuration example of seal ring 10

Next, a fifth configuration example of the seal ring 10 will be described. Fig. 13 is a cross-sectional view showing a state in which the vicinities of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the fifth configuration example are cut in the circumferential direction, and is a view showing a state before the convex portion 32 is inserted into the space reducing portion 61, or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 14 is a schematic view showing a state in which the distal end side of the convex portion 32 is inserted into the space reducing portion 61 from the state shown in fig. 13, and the resin seal ring 10 is temporarily held in a reduced diameter state.

Similarly to the reduced interval portion 61 according to the fourth structural example, the reduced interval portion 61 of the resin seal ring 10 according to the fifth structural example is also provided with a protrusion portion 61c protruding from the inner wall surface 42 b. In the configuration shown in fig. 13 and 14, the protrusion 61c is provided so as to protrude from the inner wall surface 42b on one side (Z1 side) in the thickness direction (Z direction) of the recess 42. However, the protrusion 61c is not provided on the inner wall surface 42b on the other side (Z2 side) in the thickness direction (Z direction). In other words, the protrusion 61c is provided so as to protrude from only one (one) inner wall surface 42b of the pair of opposing inner wall surfaces 42 b.

Here, the inner wall surface 42b facing the reduced interval portion 61 is a flat surface portion. Further, in the fifth configuration example, the reduced interval portion 61 is a portion where the protrusion portion 61c opposes the inner wall surface 42b as the flat surface portion, and a dimension L3 in the thickness direction (Z direction) of the reduced interval portion 61 is set smaller than a dimension L1 in the thickness direction (Z direction) of the convex portion 32. It is preferable that dimension L3 of reduced interval section 61 of the fifth configuration example is the same as dimension L3 of reduced interval section 61 of the fourth configuration example. Therefore, as shown in fig. 13 and 14, the projection dimension of the projection 61c is preferably equal to the sum of the projection dimensions of the pair of projections 61c in the fourth configuration example.

With the above configuration, it is possible to easily change from a state before the convex portion 32 is inserted into the space reduction portion 61 (between the protrusion portion 61c and the inner wall surface 42b (planar portion)) as shown in fig. 13 to a temporarily retained state in which the convex portion 32 is inserted into the space reduction portion 61 (between the protrusion portion 61c and the inner wall surface 42b (planar portion)) as shown in fig. 14 and the reduced diameter form of the resin seal ring 10 is temporarily retained. In the temporary holding state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 32a of the convex portion 32 and the protruding portion 61 c.

The resin seal ring 10 according to the fifth structural example is different from the resin seal ring 10 according to the first structural example in that the projection portion 61c is provided instead of the flat surface portion 61a, but the other structures are the same as the resin seal ring 10 according to the first structural example, and therefore, the description thereof is omitted.

(6) Sixth configuration example of seal ring 10

Next, a sixth configuration example of the seal ring 10 will be described. Fig. 15 is a cross-sectional view showing a state in which the vicinity of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the sixth configuration example is cut in the circumferential direction, and is a view showing a state before the enlarged-size portion 35 is inserted into the concave portion 42 or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 16 is a schematic view showing a state in which the expanded-size portion 35 is inserted into the recess 42 from the state shown in fig. 15, and the reduced diameter form of the resin seal ring 10 is temporarily held.

Unlike the resin seal ring 10 according to the first to fifth structural examples, the space reducing portion 61 is not provided in the resin seal ring 10 according to the sixth structural example. However, in the resin seal ring 10 according to the sixth configuration example, the enlarged-size portion 35 is provided on the root side (the right side in fig. 15 and 16) of the convex portion 32. The enlarged-dimension portion 35 is a portion in which the dimension in the thickness direction (Z direction) is set larger than the other portions of the convex portion 32.

A flat surface portion 35a parallel to the circumferential direction of the resin seal ring 10 is provided on the outer surface of the enlarged dimension portion 35. The flat surface portion 35a is a portion that comes into contact with an inner wall surface 42b (flat surface portion) of the recess 42 when the enlarged-size portion 35 is inserted into the recess 42. The flat surface portion 35a is provided at a position distant from the flat surface portion 32a with respect to a center line (not shown) of the convex portion 32 along the circumferential direction of the resin seal ring 10.

Here, when the dimension in the thickness direction (Z direction) of the enlarged-size portion 35 is L4, the following expression 2 is established between the dimension L1 in the thickness direction (Z direction) of the convex portion 32 and the dimension L2 in the thickness direction (Z direction) of the concave portion 42.

L4 > L2 ≥ L1 … … (formula 2)

However, the dimension L4 in the thickness direction (Z direction) of the enlarged-size portion 35 is slightly larger than the dimension L2 in the thickness direction (Z direction) of the recessed portion 42. Specifically, as shown in fig. 16, the reduced diameter form of the resin seal ring 10 is temporarily retained by inserting the enlarged-size portion 35 into the recess 42. However, in the operating state of the sealing device, as shown in fig. 15, the above-described dimension L2 and dimension L4 are set such that the enlarged-dimension portion 35 is disengaged from the recess 42 by the hydraulic oil.

Therefore, it is possible to easily change from the state before the enlarged-size portion 35 is inserted into the recess 42 as shown in fig. 15 to the temporarily retained state in which the reduced diameter form of the resin seal ring 10 is temporarily retained by inserting the enlarged-size portion 35 into the recess 42 as shown in fig. 16. In the temporarily held state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 35a of the enlarged-size portion 35 and the inner wall surface 42b (flat surface portion).

The resin seal ring 10 according to the sixth configuration example is different from the resin seal ring 10 according to the first configuration example in that the enlarged-size portion 35 is provided instead of the reduced-interval portion 61, but the configuration other than this is the same as that of the resin seal ring 10 according to the first configuration example, and therefore, the description thereof is omitted.

(7) Seventh configuration example of seal ring 10

Next, a seventh configuration example of the seal ring 10 will be described. Fig. 17 is a cross-sectional view showing a state in which the vicinity of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the seventh configuration example is cut in the circumferential direction, and is a view showing a state before the enlarged-dimension portion 35 is inserted into the concave portion 42 or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 18 is a schematic view showing a state in which the expanded-size portion 35 is inserted into the recess 42 from the state shown in fig. 17, and the reduced diameter form of the resin seal ring 10 is temporarily held.

Similarly to the configuration of the resin seal ring 10 according to the sixth configuration example, the resin seal ring 10 according to the seventh configuration example also has the enlarged-size portion 35 provided in the convex portion 32. However, in the resin seal ring 10 according to the seventh configuration example, the tapered guide surface 32d is provided on the tip side of the enlarged dimension portion 35 (the side opposite to the root portion of the enlarged dimension portion 35). The tapered guide surface 32d is a surface for guiding the insertion of the enlarged-dimension portion 35 into the recessed portion 42, and is a surface inclined with respect to the thickness direction (Z direction). The tapered guide surface 32d may be planar or curved as long as the insertion of the enlarged dimension portion 35 into the recess 42 can be guided satisfactorily (without stumbling of the insertion).

Therefore, it is possible to easily change from the state before the enlarged-size portion 35 is inserted into the recess 42 as shown in fig. 17 to the temporarily retained state in which the reduced diameter form of the resin seal ring 10 is temporarily retained by inserting the enlarged-size portion 35 into the recess 42 as shown in fig. 18. In the temporarily held state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 35a of the enlarged-size portion 35 and the inner wall surface 42b (flat surface portion).

In the resin seal ring 10 according to the seventh structural example, the configuration other than the tapered guide surface 32d is the same as that of the resin seal ring 10 according to the sixth structural example, and therefore, the description thereof is omitted.

(8) Eighth configuration example of seal ring 10

Next, an eighth configuration example of the seal ring 10 will be described. Fig. 19 is a cross-sectional view showing a state in which the vicinity of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the eighth configuration example is cut in the circumferential direction, and is a view showing a state before the enlarged-dimension portion 35 is inserted into the concave portion 42 or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 20 is a schematic view showing a state in which the expanded-size portion 35 is inserted into the recess 42 from the state shown in fig. 19, and the reduced diameter form of the resin seal ring 10 is temporarily held.

Similarly to the resin seal ring 10 according to the third structural example, the resin seal ring 10 according to the eighth structural example is also provided with a tapered guide surface 32b on the tip end side of the convex portion 32. The tapered guide surface 32b has the same configuration as the tapered guide surface 32b according to the third configuration example, and therefore, a detailed description thereof is omitted. The presence of the tapered guide surface 32b favorably guides the distal end side insertion recess 42 of the convex portion 32.

Therefore, it is possible to easily change from the state before the convex portion 32 is inserted into the concave portion 42 as shown in fig. 19 to the temporary holding state in which the convex portion 32 is inserted into the concave portion 42 and the form in which the resin seal ring 10 is reduced in diameter is temporarily held as shown in fig. 20. In the temporarily held state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the flat surface portion 35a of the enlarged-size portion 35 and the inner wall surface 42b (flat surface portion).

In the resin seal ring 10 according to the eighth structural example, the configuration other than the tapered guide surface 32b is the same as that of the resin seal ring 10 according to the sixth structural example, and therefore, the description thereof is omitted. Further, a configuration may be adopted in which a tapered guide surface 32d is further provided in addition to the tapered guide surface 32 b.

(9) Ninth configuration example of seal ring 10

Next, a ninth configuration example of the seal ring 10 will be described. Fig. 21 is a cross-sectional view showing a state in which the vicinity of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the ninth configuration example is cut in the circumferential direction, and is a view showing a state before the enlarged-dimension portion 35 is inserted into the concave portion 42 or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 22 is a schematic view showing a state in which the expanded-size portion 35 is inserted into the recess 42 from the state shown in fig. 21, and the reduced diameter form of the resin seal ring 10 is temporarily held.

The resin seal ring 10 according to the ninth structural example includes the enlarged-size portion 35 having a different shape from the enlarged-size portion 35 of the resin seal ring 10 according to the seventh and eighth structural examples. Specifically, the enlarged-size portion 35 is provided with a protrusion 35b instead of the flat surface portion 35 a. The projection 35b is a portion projecting from the flat surface 32a at a portion near the root of the convex portion 32.

In the configuration shown in fig. 21 and 22, the pair of protrusions 35b are disposed on the same straight line in the thickness direction (Z direction) and include the protrusion 35b protruding from the flat surface portion 32a on one side (Z1 side) in the thickness direction (Z direction) of the convex portion 32 and the protrusion 35b protruding from the flat surface portion 32a on the other side (Z2 side) in the thickness direction (Z direction) of the convex portion 32. In this way, the enlarged-size portion 35 has a configuration in which the pair of protrusions 35b are arranged on the same line in the thickness direction (Z direction), and thus the dimension L4 in the thickness direction (Z direction) of the enlarged-size portion 35 is set to be larger than the dimension L2 in the thickness direction (Z direction) of the recess 42.

In contrast to the enlarged-size portion 35 according to the sixth configuration example, the projection portion 35b according to the ninth configuration example is provided in a portion of the flat surface portion 35a of the enlarged-size portion 35 according to the sixth configuration example, which portion substantially corresponds to the tip end side of the recessed portion 42 that is inserted. That is, the projection 35b is not provided at the most proximal portion of the projection 32, but is provided at a portion closer to the root than the center in the longitudinal direction of the projection 32 but slightly farther from the most proximal portion. Here, the positions of the protrusions 35b on the convex portion 32 are the following positions: that is, in the reduced diameter form of the resin seal ring 10, the protrusion 35b is in contact with the inner wall surface 42b of the recess 42. The position of the projection 35b on the convex portion 32 is as follows: that is, in the operating state of the sealing device, the resin seal ring 10 is expanded from the diameter-reduced state by the hydraulic pressure of the hydraulic oil, and thus the protrusion 35b does not contact the inner wall surface 42 b.

With the above configuration, it is possible to easily change from the state before the enlarged-size portion 35 is inserted into the recess 42 as shown in fig. 21 to the temporarily retained state in which the reduced diameter form of the resin seal ring 10 is temporarily retained by inserting the enlarged-size portion 35 into the recess 42 as shown in fig. 22. In the temporary holding state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the protrusion 35b and the inner wall surface 42b (flat surface portion).

The resin seal ring 10 according to the ninth structural example is different from the resin seal ring 10 according to the sixth structural example in that the projection 35b is provided instead of the flat surface portion 35a, but the other configurations are the same as the resin seal ring 10 according to the sixth structural example, and therefore, the description thereof is omitted.

(10) Tenth configuration example of seal ring 10

Next, a tenth configuration example of the seal ring 10 will be described. Fig. 23 is a cross-sectional view showing a state in which the vicinity of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the tenth configuration example is cut in the circumferential direction, and is a view showing a state before the enlarged-dimension portion 35 is inserted into the concave portion 42 or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 24 is a schematic view showing a state in which the expanded-size portion 35 is inserted into the recess 42 from the state shown in fig. 23, and the reduced diameter form of the resin seal ring 10 is temporarily held.

Similarly to the enlarged-size portion 35 according to the ninth structural example, the enlarged-size portion 35 of the resin seal ring 10 according to the tenth structural example is also provided with a protruding portion 35b protruding from the flat surface portion 32a of the convex portion 32. In the configuration shown in fig. 23 and 24, the projection 35b is provided so as to project from the flat surface portion 32a on one side (Z1 side) in the thickness direction (Z direction) of the convex portion 32. However, the projection 35b is not provided on the flat surface portion 32a on the other side (Z2 side) in the thickness direction (Z direction) of the convex portion 32. In other words, the protrusion 35b is provided so as to protrude from only one (one) flat surface portion 32a of the pair of opposed flat surface portions 32 a.

Here, the inner wall surface 42b facing the enlarged-size portion 35 (the protruding portion 35b) becomes a flat surface portion. Further, in the tenth configuration example, the enlarged-size portion 35 is a portion where the protrusion 35b opposes the planar portion 32a on the other side (Z2 side) in the thickness direction (Z direction), and a dimension L4 in the thickness direction (Z direction) of the enlarged-size portion 35 is set larger than a dimension L2 in the thickness direction (Z direction) of the recess 42. It is preferable that the dimension L4 of the enlarged-size portion 35 of the tenth configuration example is the same as the dimension L4 of the enlarged-size portion 35 of the ninth configuration example. Therefore, as shown in fig. 23 and 24, the projection dimension of the projection 35b is preferably equal to the sum of the projection dimensions of the pair of projections 35b in the ninth configuration example.

With the above configuration, it is possible to easily change from the state before the enlarged-size portion 35 is inserted into the recess 42 as shown in fig. 23 to the temporarily retained state in which the enlarged-size portion 35 is inserted into the recess 42 and the reduced diameter form of the resin seal ring 10 is temporarily retained as shown in fig. 24. In the temporary holding state, the reduced diameter form of the resin seal ring 10 is temporarily held by frictional contact between the protrusion 35b and the inner wall surface 42b (flat surface portion).

The resin seal ring 10 according to the tenth configuration example is different from the resin seal ring 10 according to the sixth configuration example in that the projection 35b is provided instead of the flat surface portion 35a, but the configuration other than this is the same as the resin seal ring 10 according to the sixth configuration example, and therefore, the description thereof is omitted.

(11) Eleventh configuration example of seal ring 10

Next, an eleventh configuration example of the seal ring 10 will be described. Fig. 25 is a cross-sectional view showing a state in which the vicinities of the convex portion 32 and the concave portion 42 of the seal ring 10 according to the eleventh configuration example are cut in the circumferential direction, and is a view showing a state before the convex portion 32 is inserted into the space reducing portion 61, or a state (an operating state) after the reduced diameter form of the resin seal ring 10 is released. Fig. 26 is a schematic view showing a state in which the distal end side of the convex portion 32 is inserted into the space reducing portion 61 from the state shown in fig. 25, and the resin seal ring 10 is temporarily held in a reduced diameter state.

Similarly to the configuration of the resin seal ring 10 according to the first configuration example, the resin seal ring 10 according to the eleventh configuration example also includes the space reducing portion 61. However, in the resin seal ring 10 according to the eleventh configuration example, the inner wall surface of the recess 42 on the opening 42a side of the reduced interval portion 61 is an inclined inner wall surface 42 c. The inclined inner wall surface 42c is a surface for inserting the guide protrusion 32 into the space reducing portion 61, and is inclined with respect to the thickness direction (Z direction). Specifically, the inclined inner wall surfaces 42c are formed so that the dimension between the opposed inclined inner wall surfaces 42c gradually increases toward the opening 42 a. The inclined inner wall surface 42c is a linearly inclined inner wall surface, but may be provided in a slightly curved surface shape.

The convex portion 32 is provided with a tapered enlarged portion 36 corresponding to the inclined inner wall surface 42 c. The tapered enlarged portion 36 has a tapered wall surface 36a that abuts the inclined inner wall surface 42 c. Therefore, the tapered wall surface 36a is inclined to the same extent as the inclined inner wall surface 42 c.

Therefore, it is possible to easily change from the state before the convex portion 32 is inserted into the space reducing portion 61 as shown in fig. 25 to the temporary holding state in which the convex portion 32 is inserted into the space reducing portion 61 and the reduced diameter form of the resin seal ring 10 is temporarily held as shown in fig. 26. Further, the inclined inner wall surface 42c abuts against the tapered wall surface 36a, so that the first open end 30 and the second open end 40 can be prevented from being displaced from each other in the axial direction (Z direction).

In the resin seal ring 10 according to the eleventh configuration example, the configuration other than the tapered wall surface 36a, the tapered enlarged portion 36, and the inclined inner wall surface 42c is the same as that of the resin seal ring 10 according to the first configuration example, and therefore, the description thereof is omitted.

[3 ] method for assembling sealing device ]

Next, a method of assembling a sealing device in which the resin seal ring 10 is mounted on the shaft body 100 and a sealing device not shown is assembled will be described. When the sealing device is assembled, the resin seal ring 10 in the diameter-expanded state is mounted in the annular groove 110 of the shaft body 100 (seal ring mounting step).

After this mounting, the convex portion 32 is press-fitted into the concave portion 42, and the temporary holding portion 60 of the resin seal ring 10 temporarily holds the seal of the resin seal ring 10 (temporary holding step). Then, the resin seal ring 10 is reduced in diameter, and the resin seal ring 10 does not protrude from the annular groove 110. After the diameter reduction, the shaft body 100 is inserted into the shaft hole of the housing while maintaining the reduced diameter form of the resin seal ring 10 (insertion step).

When the sealing device is operated through the above-described and subsequent steps, the projection 32 moves in the direction of separating from the recess 42 by the hydraulic pressure of the hydraulic oil of the sealing device, and the reduced diameter form of the resin seal ring 10 is released. This enables the resin seal ring 10 to exhibit desired sealing performance.

[4. about the effects ]

The resin seal ring 10 described above is fitted into the annular groove 110 provided on the outer periphery of the shaft body 100, thereby sealing a gap between the shaft body 100 and a housing (not shown), and has an opening gap 50 between the first opening end portion 30 (one opening end portion) and the second opening end portion 40 (the other opening end portion). In the resin seal ring 10, the first opening end portion 30 (one opening end portion) and the second opening end portion 40 (the other opening end portion) are provided with the temporary holding portion 60, and the temporary holding portion 60 temporarily holds the reduced diameter form of the resin seal ring 10 in a state where the first opening end portion 30 and the second opening end portion 40 are in contact with each other.

Here, when the resin seal ring 10 is mounted in the annular groove 110, the diameter of the resin seal ring 10 increases, and at this time, a portion of the resin seal ring 10 may be formed with a portion that is plastically deformed. When the plastic deformation occurs as described above, the outer diameter of the resin seal ring 10 in a free state (the outer diameter of the resin seal ring 10 in a state where no external force is applied thereto after assembly) may become larger than the outer diameter of the resin seal ring 10 in a use state.

However, in the present embodiment, since the temporary holding portion 60 is provided in the resin seal ring 10, the reduced diameter form of the resin seal ring 10 can be maintained. Therefore, the resin seal ring 10 can be prevented from becoming larger as it goes out of the annular groove 110. Thus, when the shaft body 100 having the resin seal ring 10 mounted in the annular groove 110 is inserted into the shaft hole of the housing, it is possible to prevent the resin seal ring 10 from being damaged such as broken or scratched due to interference between the resin seal ring 10 and the opening end of the shaft hole. In this way, since damage to the resin seal ring 10 can be prevented, it is possible to prevent a failure of the sealing device due to a reduction in sealing performance of the resin seal ring 10 or the like.

In the resin seal ring 10 of the present embodiment, the first opening end portion 30 (one opening end portion) is provided with a convex portion 32 that protrudes to one side in the circumferential direction of the resin seal ring 10. In addition, the second opening end 40 (the other opening end) is provided with a recess 42 into which the protrusion 32 is inserted. The convex portion 32 and the concave portion 42 are configured to: in a state where the convex portion 32 is inserted into the concave portion 42, at least a part of the outer surface of the convex portion 32 is in contact with the inner surface of the concave portion 42, thereby temporarily retaining the retracted state of the resin seal ring 10.

In the case of such a configuration, the fitting state of the convex portion 32 and the concave portion 42 can be realized, and the temporary holding portion 60 is provided by utilizing friction when the convex portion 32 and the concave portion 42 are in contact in the fitting state, so that the reduced diameter form of the resin seal ring 10 can be maintained.

In the present embodiment, the second open end 40 (the other open end) is provided with a clamping piece portion 43 (a first clamping piece portion) which is present on one side (the Z1 direction) in the thickness direction (the Z direction) of the resin seal ring 10 and a clamping piece portion 44 (a second clamping piece portion) which is present on the other side (the Z2 side) in the thickness direction (the Z direction), and the recess 42 is provided between the clamping piece portion 43 (the first clamping piece portion) and the clamping piece portion 44 (the second clamping piece portion).

With such a configuration, the convex portion 32 can be inserted into the concave portion 42 between the clamping piece portion 43 (first clamping piece portion) and the clamping piece portion 44 (second clamping piece portion). Therefore, the diameter-reduced form of the resin seal ring 10 inserted into the recess 42 can be maintained by the elasticity of the clamping piece portion 43 (first clamping piece portion) and the clamping piece portion 44 (second clamping piece portion).

In the present embodiment, at least one of the convex portion 32 and the concave portion 42 is provided with a planar portion (a planar portion 32a, a planar portion 35a, an inner wall surface 42b, and a planar portion 61a) parallel to the circumferential direction of the resin seal ring 10. The planar portions (the planar portion 32a, the planar portion 35a, the inner wall surface 42b, and the planar portion 61a) are in frictional contact with the convex portion 32 and the concave portion 42. Therefore, the convex portion 32 can be smoothly pulled out from the concave portion 42 without being caught between the concave portion 42 and the convex portion 32.

In the present embodiment, as shown in fig. 5 to 14, the concave portion 42 can be provided with the reduced interval portion 61, and the reduced interval portion 61 is a portion in which the dimension L3 is set smaller than the other portions of the convex portion 32. Further, the space reduction portion 61 is in frictional contact with the convex portion 32 interposed therebetween.

In the case of such a configuration, the convex portion 32 can be sandwiched by the space reduction portion 61. Therefore, the reduced diameter form of the resin seal ring 10 in which the convex portion 32 is inserted into the concave portion 42 can be maintained by the frictional contact between the reduced interval portion 61 and the outer surface of the convex portion 32.

In the present embodiment, as shown in fig. 5 to 10, the reduced interval portion 61 may be provided with a flat surface portion 61a parallel to the circumferential direction of the resin seal ring 10. In the case of such a configuration, the flat surface portion 61a presses the convex portion 32. Therefore, the reduced diameter form of the resin seal ring 10 in which the convex portion 32 is inserted into the concave portion 42 can be maintained by the frictional contact between the flat portion 61a and the outer surface of the convex portion 32. Further, since the flat portion 61a and the convex portion 32 can be formed in a state where they are not caught, the convex portion 32 can be smoothly pulled out from the concave portion 42.

In the present embodiment, as shown in fig. 11 to 14, the interval-reduced portion 61 may be provided with a protrusion 61c protruding from the inner wall surface 42b of the recess 42. In the case of such a configuration, the protrusion 61c presses the convex portion 32. Therefore, the reduced diameter form of the resin seal ring 10 in which the convex portion 32 is inserted into the concave portion 42 can be maintained by the frictional contact between the protrusion portion 61c and the outer surface of the convex portion 32.

In the present embodiment, as shown in fig. 15 to 24, the convex portion 32 can be provided with the enlarged-size portion 35, the enlarged-size portion 35 is a portion in which a dimension L4 in the direction toward the inner wall surface of the concave portion 42 is larger than other portions of the convex portion 32, and the enlarged-size portion 35 is in frictional contact with the inner wall surface 42b of the concave portion 42. In the case of such a configuration, when the enlarged-size portion 35 is inserted into the recess 42, the inner wall surface 42b of the recess 42 presses the enlarged-size portion 35. Therefore, the reduced diameter form of the resin seal ring 10 in which the convex portion 32 is inserted into the concave portion 42 can be maintained by frictional contact between the enlarged-size portion 35 and the inner wall surface 42 b.

In the present embodiment, as shown in fig. 15 to 20, the enlarged-size portion 35 may be provided with a flat surface portion 35a parallel to the circumferential direction of the resin seal ring 10. In the case of such a configuration, the flat surface portion 35a is pressed by the inner wall surface 42b of the recess 42. Therefore, the reduced diameter form of the resin seal ring 10 in which the convex portion 32 is inserted into the concave portion 42 can be maintained by the frictional contact between the flat portion 35a and the inner wall surface 42 b. Further, since the flat portion 35a and the inner wall surface 42b can be formed in a state where they are not caught, the convex portion 32 can be smoothly pulled out from the concave portion 42.

In the present embodiment, as shown in fig. 21 to 24, the enlarged-size portion 35 may be provided with a protrusion 35b protruding from the outer surface of the convex portion 32. In the case of such a configuration, the protrusion 35b is pressed by the inner wall surface 42b of the recess 42. Therefore, the reduced diameter form of the resin seal ring 10 in which the convex portion 32 is inserted into the concave portion 42 can be maintained by the frictional contact between the protrusion portion 35b and the outer surface of the inner wall surface 42 b.

In addition, in the present embodiment, there can be realized a method of assembling a sealing device, the sealing device including: a housing having a shaft hole, a shaft body 100 having an annular groove 110, and a resin seal ring 10 having an opening gap 50 between a first opening end portion 30 (one opening end portion) and a second opening end portion 40 (the other opening end portion), and the resin seal ring 10 is disposed in the annular groove 110 provided on the outer periphery of the shaft body 100.

Specifically, the resin seal ring 10 includes a temporary holding portion 60 that temporarily holds the reduced diameter form of the resin seal ring 10 in a state where the first opening end portion 30 (one opening end portion) and the second opening end portion 40 (the other opening end portion) are in contact with each other. The assembling method of the sealing device comprises the following steps: a seal ring mounting step of mounting the resin seal ring 10 in an expanded diameter state in the annular groove 110, a temporary holding step of temporarily holding the reduced diameter form of the resin seal ring 10 by the temporary holding portion 60 after the seal ring mounting step, and an insertion step of inserting the shaft body 100 into the shaft hole while holding the reduced diameter form of the resin seal ring 10 after the temporary holding step.

According to the above-described method of assembling the sealing device, the temporary holding portion 60 of the resin seal ring 10 temporarily holds the seal of the resin seal ring 10, so that the resin seal ring 10 does not protrude from the annular groove 110. After the diameter reduction, the shaft body 100 is inserted into the shaft hole of the housing while maintaining the reduced diameter form of the resin seal ring 10, whereby it is possible to prevent the resin seal ring 10 from being damaged such as breaking or scratching due to interference or the like between the resin seal ring 10 and the opening end portion of the shaft hole. In this way, since the resin seal ring 10 can be prevented from being damaged, it is possible to prevent a failure of the sealing device due to a reduction in the sealing performance of the resin seal ring 10 or the like.

[5. modification ]

While the embodiments of the present invention have been described above, the present invention can be modified in various ways. This will be described below.

In the above embodiment, the configuration in which the second open end 40 (the other open end) is provided with the holding piece portion 43 (the first holding piece portion) existing on one side (the Z1 direction) in the thickness direction (the Z direction) of the resin seal ring 10 and the holding piece portion 44 (the second holding piece portion) existing on the other side (the Z2 side) in the thickness direction (the Z direction) has been described. In the above-described embodiment, the configuration in which the convex portion 32 is provided at the first opening end portion 30 (one opening end portion) at a halfway portion in the thickness direction (Z direction) of the thin portion 31 has been described. However, the present invention is not limited to the above embodiment. For example, instead of the thickness direction (Z direction) of the resin seal ring 10, a first opening end portion (one clamping piece portion) may be provided on one side in the radial direction of the resin seal ring 10, and a second opening end portion (the other clamping piece portion) may be provided on the other side in the radial direction. At this time, the convex portion may be located between a first opening end portion (one clamping piece portion) and a second opening end portion (the other clamping piece portion) which are opposed in the radial direction. That is, the first open end 30 and the second open end 40 shown in fig. 1 and 2 may be rotated 90 degrees so that the convex portions and the concave portions are positioned on the upper surface side (Z1 side) of the resin seal ring, or conversely, the convex portions and the concave portions may be positioned on the lower surface side (Z2 side) of the resin seal ring.

Even with such a configuration, by providing the temporary holding portion similar to that described in the above embodiment between the first opening end portion (one clamping piece portion) and the second opening end portion (the other clamping piece portion), the reduced diameter form of the resin seal ring 10 can be temporarily held.

In the above embodiment, in addition to the resin seal ring 10 according to the fifth structural example and the resin seal ring 10 according to the tenth structural example (i.e., the first to fourth structural examples, the sixth to ninth structural examples, and the eleventh structural example), the resin seal ring 10 is provided in a symmetrical shape with respect to the circumferential direction perpendicular to the thickness direction (Z direction). However, the resin seal rings 10 according to the first to fourth structural examples, the sixth to ninth structural examples, and the eleventh structural example may not be provided so as to be symmetrical with respect to the circumferential direction.

For example, in the first to third configuration examples, the length of the planar portion 61a in the circumferential direction may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side), and the height of the planar portion 61a protruding from the inner wall surface 42b of the recess 42 may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side). In the fourth configuration example, the circumferential positions of the protrusions 61c may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side), and the heights of the protrusions 61c protruding from the inner wall surface 42b of the recess 42 may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side). In the sixth to eighth configuration examples, the length of the planar portion 35a in the circumferential direction may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side), and the height of the planar portion 35a protruding from the planar portion 32a may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side).

In the ninth configuration example, the circumferential position of the projection 35b may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side), and the height of the projection 35b from the flat surface portion 32a of the projection 32 may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side). In the eleventh configuration example, the inclination angles of the inclined inner wall surface 42c and the tapered wall surface 36a may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side). In the eleventh configuration example, the boundary position between the planar portion 61a and the inclined inner wall surface 42c and the boundary position between the planar portion 32a and the tapered wall surface 36a may be different between the upper surface side (Z1 side) and the lower surface side (Z2 side). In the eleventh configuration example, the inclined inner wall surface 42c and the tapered wall surface 36a may be present only on one of the upper surface side (Z1 side) and the lower surface side (Z2 side).

Claims (11)

1. A resin seal ring which seals a gap between a shaft body and a housing by being fitted in an annular groove provided on an outer periphery of the shaft body and has an opening gap between one opening end portion and the other opening end portion, the resin seal ring being characterized in that,

the first opening end portion and the other opening end portion are provided with temporary holding portions for temporarily holding a reduced diameter form of the resin seal ring in a state where the first opening end portion and the other opening end portion are in contact with each other.

2. The resin seal ring according to claim 1,

a convex portion protruding toward one side in the circumferential direction of the resin seal ring is provided at the one opening end portion;

a concave part into which the convex part is inserted is arranged on the other opening end part;

the convex portion and the concave portion are configured to: in a state where the convex portion is inserted into the concave portion, at least a part of an outer surface of the convex portion is in contact with an inner surface of the concave portion, thereby temporarily retaining a reduced diameter form of the resin seal ring.

3. The resin seal ring according to claim 2,

a first holding piece portion that is provided on one side in a thickness direction of the resin seal ring and a second holding piece portion that is provided on the other opening end portion;

the recess is disposed between the first clamping piece portion and the second clamping piece portion.

4. The resin seal ring according to claim 2,

a first holding piece portion that is provided at one side in a radial direction of the resin seal ring and a second holding piece portion that is provided at the other opening end portion;

the recess is disposed between the first clamping piece portion and the second clamping piece portion.

5. The resin seal ring according to claim 3 or 4,

a flat surface portion parallel to a circumferential direction of the resin seal ring is provided on at least one of the convex portion and the concave portion;

the flat surface portion is in frictional contact with an object side where the convex portion and the concave portion come into contact.

6. The resin seal ring according to claim 5,

a space reducing portion is provided in the recess, and the space reducing portion is a portion having a smaller size than other portions of the recess;

the interval reducing part is in frictional contact with the convex part in a state of clamping the convex part.

7. The resin seal ring according to claim 6,

the reduced interval portion is provided with a flat surface portion parallel to the circumferential direction of the resin seal ring.

8. The resin seal ring according to claim 6,

the interval-reduced portion is provided with a projection portion projecting from an inner wall surface of the recess.

9. The resin seal ring according to claim 5,

an enlarged-dimension portion that is a portion whose dimension in a direction toward an inner wall surface of the concave portion is set larger than other portions of the convex portion is provided in the convex portion;

the enlarged dimension portion is in frictional contact with an inner wall surface of the recess.

10. The resin seal ring according to claim 9,

the enlarged-size portion is provided with a flat surface portion parallel to the circumferential direction of the resin seal ring.

11. The resin seal ring according to claim 9,

the enlarged-size portion is provided with a protrusion protruding from an outer surface of the convex portion.

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