JP2002081551A - Seal ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve abrasion resistance by forming a lubricating film of subject liquid to be sealed on the whole surface without deteriorating sealing performance of sealing surfaces on both sides of a seal ring. SOLUTION: On the seal surfaces 21 of both sides of the seal ring 20, micro- grooves 22 for lubrication penetrating between the inner and the outer circumferential side in such a degree as not to deteriorate sealing performance are formed, and the sealing surface 21 is lubricated by subject liquid to be sealed leaking from the lubricating grooves 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal ring, and more particularly to an oil seal ring of a heat-resistant synthetic polymer used for sealing hydraulic oil of an automatic transmission of an automobile.

[0002]

2. Description of the Related Art As shown in FIG. 8, a seal ring 1 is generally mounted in a peripheral groove 3 of a shaft 2 and is sealed by pressing an outer peripheral seal surface of the seal ring 1 against an inner peripheral surface 4 'of a cylinder 4. At the same time, the peripheral groove 3 is sealed by pressing one of the sealing surfaces 5 on both side sealing surfaces against the inner wall of the peripheral groove 3.

In the case of a device in which the shaft 2 rotates, the sealing surface 5
Since frictional resistance and wear occur between the inner ring and the inner wall of the circumferential groove 3, it has been proposed to use a seal ring 1 as shown in FIGS. -88062).

In these seal rings 1, lubrication grooves 6, 7 are formed on a sealing surface 5, and the lubrication grooves 6, 7 are formed.
The lubricating film is formed on the sealing surface 5 by introducing the liquid to be sealed. A straight cut or angle cut type seal ring as shown in FIG. 16 may have a maximum leak amount of about 300 to 600 cc / min or more, depending on specifications and conditions.

In the case of a seal ring having an angle cut mating shape, when the ambient temperature changes from a low temperature to a high temperature during use, the mating amount changes due to the thermal expansion of the seal ring, and the amount of leakage of the seal becomes unstable. Sometimes it was.

[0006]

However, the lubricating grooves 6 and 7 are open on the inner peripheral side of the sealing surface 5 to prevent the sealing performance of the sealing surface 5 from being impaired. Is closed. For this reason, since the outer peripheral portion of the sealing surface 5 is in close contact with the inner surface of the peripheral wall 3 over the entire peripheral surface,
It is difficult to form a lubricating film. As a result, if the shaft 2 is made of a soft material such as an aluminum alloy, the seal surface 5 is worn due to relative rotation between the seal ring 1 and the shaft 2, or the shaft 2 is a material having low wear resistance such as aluminum. In some cases, the inner surface of the peripheral wall 3, for example, the seal surface 5 may be worn.

Accordingly, the first object of the present invention is to improve the abrasion resistance of the seal ring itself or the mating member by forming a lubricating film on the entire surface of the seal while maintaining the sealing property of the seal ring. Aim.

On the other hand, the cross-sectional shape of the conventional seal ring 1 is square or rectangular as a whole, and when such a seal ring 1 is formed of a synthetic resin, the mating surface 9 of the mold 8 is connected to one side of the seal ring 1. Side surface 10 and outer peripheral surface 11
(That is, one end of the outer peripheral surface 11). With this setting, the burrs 12 during molding are
Is generated at a position deviating from both the side surface 10 and the outer peripheral surface 11 and the generated position is a corner portion.
This is because the burrs 12 are easily removed.

[0009] However, in order to achieve the above-mentioned first object, in order to form a lubricating film on the entire surface of the sealing surface,
When the lubrication groove 19 penetrating inside and outside is formed and this is injection-molded with the above-described mold 8, the burr 12 closes the lubrication groove 19, so that a seal ring that achieves the purpose cannot be obtained.

Therefore, the present invention provides a seal ring made of a synthetic resin which can form a lubricating film on the entire seal surface without being affected by burrs at the time of molding. The purpose of.

It is a third object of the present invention to provide a seal ring having a stable leak amount at both a low temperature and a high temperature.

It is a fourth object of the present invention to provide a seal ring made of a sliding material having good sliding characteristics.

[0013]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention provides a seal ring having seal surfaces formed on both side surfaces of the ring, wherein the seal surface does not impair the sealability. In this case, the minute lubrication grooves are provided in a penetrating manner from the inner circumference to the outer circumference.

According to the above configuration, since the liquid to be sealed leaks through the lubrication groove, a lubricating film is formed over the entire width of the sealing surface by the relative rotation with the counterpart member. Function is maintained.

In order to attain the second object, the present invention provides a method of manufacturing a fuel cell comprising the steps between both side surfaces of a ring and an outer peripheral surface, and between both side surfaces of a ring and an inner peripheral surface, the steps being larger than the depth of the lubrication groove. A configuration with a section was adopted.

According to the above configuration, since the burrs are formed at positions apart from the lubrication grooves by the height of the step portion, the lubrication grooves can be prevented from being blocked by the burrs.

Further, in order to achieve the third object, in the abutting portion composed of opposed abutting portions of a seal ring having a rectangular cross section, the abutting portions are respectively opposed to two of the four sides of the rectangular cross section. When dividing into four rectangular cross-sections by connecting the center portions of the sides, a projection is provided on one of the two rectangular cross-sections on the outer diameter surface side of the seal ring, and a projection is provided on the outer diameter surface side. A cut-out portion for receiving the protrusion is provided in the other rectangular cross-section portion of the one rectangular cross-section portion, and the cut-out portion of the other mating portion is formed at a position where the protrusion of the opposite mating portion is fitted.

In addition, an interval is provided between the tip end surface of the projection and the stepped surface of the notch facing the projection so as not to impair the sealing performance.

Further, the abutting surfaces formed of the two rectangular cross-sections on the inner diameter surface side of the seal ring of the respective abutments are parallel to each other. The abutting surface of the other and the abutting surface of the other abutment provided a gap within a range that does not impair the sealing performance. Still further, on the outer diameter surface side of the seal ring, an outer diameter surface side gap between a tip end surface of the projection and a step surface of a cutout portion opposed to the projection, and an inner diameter surface of the seal ring Side, the inner-diameter surface-side gap between the butting surface of the one abutment and the abutting surface of the other abutment is equal, or the outer-diameter-side gap is greater than the inner-diameter surface gap. It was a long gap.

Since the predetermined engagement portion is formed, the sealing performance can be maintained. In addition, since the predetermined interval is provided, even if the abutment is inadvertently closed, an excessive force is not applied to the outer peripheral surface projection, and the loss can be prevented.

Furthermore, in order to achieve the fourth object, a resin composition containing 90 to 50% by weight of a thermoplastic aromatic heat-resistant synthetic polymer and 10 to 50% by weight of a reinforcing fiber is provided.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An oil seal ring using the above-mentioned oil-in-oil sliding material obtained by molding a composition comprising a heat-resistant synthetic polymer will be described.

First, a molded product is obtained by injection molding a seal ring into a shape having an abutment and having no overlapping in the radial direction between the two. The method is performed by using a usual method. can get. As shown in FIG. 11, the obtained seal ring has a gap between a part of the mating portions 105 facing each other, and the seal ring 104 is slightly shifted from the center of the entire length of the seal ring 104. (± 10
It is obtained by injection molding from a metal mold having a gate 107 which is a material injection position 106 at a position (about ± 30 °).

This is because the stress at the time of assembling the seal ring into the seal groove of the mating member is concentrated at the center of the entire length, so that the stress is not concentrated at the gate portion.
6 is arranged at a position slightly deviated from its center.
In particular, in the case of a seal ring with an abutment shape having a step-cut shape, if the gate position is shifted from the center of the entire length of the seal ring by about ± 10 ° to ± 30 °, heat fixing after molding and incorporation of the seal ring into the piston Even when the projection is sometimes expanded or closed more by the length of the step cut portion, application of a large force to the gate portion can be reduced.

Specifically, in order to avoid stress concentration, a range of ± 1 ° at both ends of substantially the entire length of the seal ring is avoided, ± 1 ± 30 °, preferably ± 3 ± 30 °, more preferably The injection position or the gate position may be provided in the range of ± 10 ± 30 °. In addition, it is preferable that only one injection position and one gate position be provided as shown in each drawing in order to eliminate a weld portion where mechanical strength is weakened.

Such a seal ring has a ring outer diameter of 2
5 mm or more, preferably 30 mm or more, or a value exceeding these outer diameters (the upper limit is not particularly limited, but 200 m
m or less, preferably 100 mm or less), and both the thickness and width of the ring cross section are within 3 mm, preferably within 2.5 mm,
(The lower limit is not particularly limited, but is 1 mm or more, and preferably 1.5 mm or more.) It is suitable for a medium-diameter or large-diameter seal ring having a long developed length and small wall thickness and width.
Since the above resin material has a high melt viscosity unlike polyacetal, for example, the conventional problem can be solved by applying the present invention to such a seal ring.

After the above-described injection molding, as shown in FIG. 12, an injection-molded article 101 obtained by the above-described method using a jig composed of a cylindrical body 102 made of synthetic resin or rubber and a ring gauge 103 is used. Is inserted into the inner surface of the ring gauge 103, and the cylindrical body 102 is inserted inside the injection molded product 101. The resin constituting the cylindrical body 102 is a substance having a larger coefficient of thermal expansion than the ring gauge 103, for example, a resin or a polymer substance such as an elastomer having a larger coefficient of thermal expansion than the ring gauge 103, and is formed by thermal expansion when heated. A force is applied from the inside of the article 101. In the case of an elastomeric polymer, if the rubber hardness (Hs) is about 60 to 100, preferably about 65 to 90, good elastic forcing is obtained, which is considered preferable. If the rubber hardness is too high, it is too hard.
02 is difficult to insert, and if the rubber hardness is too low, it is too soft, so that it is difficult to obtain an appropriate elastic forcing force.

Next, the entire jig is placed in an electric furnace or the like.
The injection-molded article 1 is heated so as to have a temperature equal to or higher than the glass transition point of the base resin of the injection-molded article 101, and the injection-molded article 1 is thermally fixed.

The seal ring obtained in this way can be used as it is, but there are cases where there is a problem such as catching at the time of sliding of the corner, and there is a case where supply of the lubricant becomes a problem. . In such a case, if necessary, chamfering the corner, providing a step,
A groove for lubrication may be provided. FIG. 13 shows an example in which such a component is provided. FIGS. 13 (a) to 13 (f) show a seal ring 1 having a structure of a joint 119 having a complicated shape according to the present invention.
It is 10. The shape of the abutment 119 can be a desired shape depending on the purpose. The ring 110
A lubrication groove 112 penetrating from the inner peripheral side to the outer peripheral side is formed at approximately three equally spaced positions on the sealing surface 111 on one side surface, and the sealing surface 121 on the other side surface is slightly shifted in position to form a similar groove. A lubrication groove 112 is formed.

These lubricating grooves 112 are fine with a depth of about 0.1 mm and a width of about 0.1 mm. Do not spoil. In addition, a chamfered portion 113 is formed at an opening end of the lubrication groove 112 on the seal surface 111 side.

The lubrication groove 112 is formed as shown in FIG.
As shown in the figure, a trapezoid is preferable, and the seal surface 111 and the lubrication groove 112 at the boundary between the seal surface 111 and the lubrication groove 112
Is preferably an obtuse angle, that is, more than 90 ° and less than 180 °, and more than 90 ° depending on specifications and the like.
It is preferably less than 0 ° and 120 ° to 135 °. Also,
By adjusting the angle θ, any lubrication groove 112
Can be obtained, and burrs generated when a mold is used can be easily removed by barrel processing.

Since the seal surface on the side surface of the ring leaks inward and outward through the lubrication groove 112 so that the sealability is not impaired through the lubricant, the lubricating film covering the entire width of the seal surface is entirely rotated by the relative rotation with the counterpart material. It is formed over the circumference.
For this reason, the lubricating properties over the entire sealing surface are improved, the wear resistance is improved, and further, there is an effect that the mating material is not worn. Further, when the amount of the surrounding lubricant decreases, the lubricant is replenished, and the smooth rotation is maintained for a long time.

As shown in FIG. 13A, the lubrication grooves 112 are shifted from each other in the range of 1 to 180 °, preferably 3 to 60 °, more preferably 5 to 30 ° on both side surfaces 111 of the ring. It may be formed. If this angle is too small, the grooves will approach each other and the thickness of that part will decrease, so that mechanical strength cannot be expected. If it is too large, it will interfere with other lubrication grooves and joints, which is not preferable.

As shown in FIGS. 13D and 13E, the cross-sectional shape of the seal ring 110 is between the both-side seal surface 111 and the outer peripheral surface 114 and between the both-side seal surface 111 and the inner peripheral surface 1.
The step portions 116 are respectively provided between the step portions 15. As shown in FIG. 13 (f), the step portion 116 has a right angle surface 117 with respect to the sealing surface 111 and a right angle surface 1 with respect to the outer peripheral surface 114.
17 ′ and an inclined surface 118 formed between the right-angled surfaces 117 and 117 ′. The height h of the step portion 116 is higher than the depth of the lubrication groove 112.

The height h of the step portion 116 is not particularly limited, but is about 5 to 50% of the length in the radial direction or the length in the axial direction of the rectangular section of the seal ring 110, respectively.
Preferably, it is about 5 to 25%, more preferably about 5 to 25%.
Preferably, it is set to about 10% and provided on one or both sides of the seal ring 110. Specifically, the lower limit of the height h of the step portion 116 is preferably 0.05 mm,
0.1 mm is preferred, and 0.2 mm is more preferred. The upper limit is preferably 0.5 mm, more preferably 0.4 mm, and even more preferably 0.3 mm. Any of the above numerical ranges may be selected in a range exceeding the lower limit and less than the upper limit.

If the height h of the step is too small, there is a possibility that a problem will be caused when the displacement between the movable mold and the fixed mold occurs in a relatively short cycle due to long-term use of the mold. If the amount is too large, the area of the seal portion of the seal ring, that is, the so-called seal land decreases, so that reliable and good sealing characteristics cannot be expected.

As the shape of the fitting 119, any of a so-called straight cut type, a step cut type and the like can be used according to the purpose, the place of use, and the like. More complex shapes than the shape of the mouth, ie, FIGS.
At the abutment. Hereinafter, the abutment of FIG. 14 will be described first.

FIGS. 14 (a), 14 (b) and 14 (c) show one type of abutments 121 and 121 'as an abutment having a complicated shape according to the present invention. This contact 121, 12
1 ′ is composed of an outer-diameter-side projection 122 and an outer-diameter-side step 127, and the outer-diameter-side projection 12 of both abutments 121 and 121 ′.
2 and the outer-diameter-side step 127, and the outer-diameter-side step 127 and the outer-diameter-side protrusion 122 are complementarily fitted with a fixed gap therebetween. It is.

In the abutting portion 121, 121 'of the seal ring having a rectangular cross section, the abutting portion 121, 121' is a central portion of two opposing sides of the four sides of the rectangular cross section. To divide the seal ring into four rectangular cross-sections,
A projection 122 is provided on one of the two rectangular cross-sectional portions (the hatched portion A in FIG. 14C) of the two rectangular cross-sectional portions provided on one side, and the other rectangular cross-sectional portion of the two rectangular cross-sectional portions on the outer diameter surface 131 side is provided. Is provided with a notch for receiving the projection, that is, a step 127 on the outer diameter surface side. The notch of the other abutment 121 ′, that is, the step portion 127 on the outer diameter side is formed at the position where the projection 122 of the one abutment 121 is fitted to the other abutment 121, and the abutments 121 and 121 are formed. 'Can be fitted.

The tip surface 129 of the projection 122 and the notch facing the projection 122, that is, the step surface 128 of the outer diameter side step 127 may be in contact with each other, but a seal is provided between them. It may have an interval as long as the property is not impaired. With this interval, the load on the protrusion 122 can be suppressed.

Further, in the abutting portion composed of the facing abutments 121 and 121 'of the seal ring having a rectangular cross section, the two rectangular cross sections on the inner diameter side of the seal ring of the respective abutments 121 and 121'. The butting surface 130 (the hatched portion B in FIG. 14C)
Parallel to each other, and the facing abutments 121, 12
1 ′, the mating surface 130 of one mating portion 121 and the mating surface 1 of the other mating portion 121 ′
30 can be provided when forming and annealing the seal ring so as to have a gap within a range that does not impair the sealability. Thus, the seal ring can be used as a lubrication groove when used.

Further, at the abutting portion formed by the facing abutments 121 and 121 'of the seal ring having a rectangular cross section, the tip surface of the projection 122 and the tip surface of the projection 122 are located on the outer diameter surface 131 side of the seal ring. The notch opposite to 122, that is, the step surface 12 of the outer diameter surface side step 127
8 is equal to the inner-diameter surface-side gap between the abutting surface of the one abutment and the abutting surface of the other abutment on the inner-diameter surface side of the seal ring. Alternatively, the outer diameter side gap may be longer than the inner diameter side gap. By doing so, the load on the protrusion 122 can be suppressed.

The length of the protruding portion is not particularly limited, but is preferably 0.01 to 0.1 times the deployed length of the seal ring from the viewpoint of strength and the like. With this configuration, even when the abutting portions overlap each other, the thickness does not become larger than the thickness of the seal ring, and uneven wear such as a single contact at only the abutting portion does not occur.

The length of the gap is not particularly limited, but the gap on the inner diameter side and the gap on the outer diameter side are both 0.001 to 0.01 times the deployment length of the seal ring. Preferably, there is. In particular, since the gap on the outer diameter surface side affects the standard of the sliding dimension, it is more preferable to set the gap in the above range.

In addition, as for one of the abutments 121, the inner diameter surface of the portion where the outer diameter surface side projection 122 protrudes in the circumferential direction from the ring main body and the portion where the recess forming the outer diameter surface side step 127 extends in the opposite direction. When the surface at the front end on the side is referred to as the butting surface 130, the outer diameter surface side projection 1
Numeral 22 is provided on one side surface when the abutting surface 130 is bisected on the left and right sides, and on the outer diameter side when the abutting surface 130 is bisected inside and outside (the inner diameter side and the outer diameter side of the ring main body 111). The outer diameter surface 131 of the projection 122 is formed so as to be continuous with the outer surface of the ring main body without any step and to have the same curvature.

When the length of the pair of protrusions 122 with respect to the butting surface 130 is equal to each other, when the seal rings are incorporated into a piston or the like,
The protrusion length of the protrusion 122 is equal on both the hydraulic side and the exhaust side. Therefore, the seal ring can be efficiently and quickly incorporated into the piston or the like without considering the directionality.

The outer diameter side step 127 is provided on the other side and outer diameter when the abutment surface 130 is similarly divided into right and left and inside and outside.
27 has an inner surface 132 formed to have the same curvature as the inner diameter surface of the ring body.

The other contact 121 ′ is the contact 1
21 and is formed in a form complementary to
121 ′ are fitted to each other with a certain gap, and the seal ring has a substantially perfect circular shape.

The abutments 121, 121 'may be provided with chamfers or fillets as desired. The chamfered portion may have an arc shape having a predetermined curvature (also referred to as a radius), but may have a curvature of 0, that is, a chamfered shape due to a slope (also referred to as a chamfer). Such a chamfered portion can have, for example, a shape in which the curvature continuously changes in various ways. By providing the chamfered portion and the fillet, the amount of protrusion between the abutting portions 121 and 121 'or between the abutting portion and the partner material becomes zero or less, so that local contact can be prevented. .

The following are examples of the chamfers and fillets that can be provided at the abutments 121 and 121 '. A chamfered portion 123 and a stepped portion 12 at each boundary between the tip surface 129 of each outer diameter surface side projection 122 and the outer diameter surface 131 are formed.
7, a chamfered portion 123 'between the stepped surface 128 of the ring 7 and the outer diameter surface 131 of the ring body, each outer diameter surface side projection 122 and the tip surface 12
9 and a chamfered portion 124 at the boundary between the inner surface 133 of the outer diameter side projection 122 and a chamfered portion 124 ′ at the boundary between the tip end surface 129 of each outer diameter side projection 122 and the inner diameter side surface 136 of the outer diameter side projection 122. The chamfered portion 124 ″ is formed at the boundary between the inner surface 132 of each outer diameter side step 127 and the abutting surface 130, the step surface 128 of each outer diameter side step 127 and the inner surface 133 of the outer diameter side projection 122. Or the stepped surface 128 of each outer diameter side step 127 and the outer diameter side step inner surface 132
Can be provided with a rounded fillet 125 at the boundary of. Note that corners other than the above-described corners may be formed into a chamfered shape or a shape obtained by adding a fillet.

Further, in order to prevent contact between the abutments 121 and 121 ′, the inner side surface 13 of the outer surface side projection 122 is formed.
6 and the other abutment 121 'or 121 facing the same
It can be provided a predetermined gap g ₁ between the inner surface 132 of the outer diameter surface side sectional portion 127 of the. By doing so, the amount by which the outer diameter surface side projection 122 protrudes toward the outer diameter surface side of the seal ring is further reduced.

Further, the dimensional tolerance in the thickness direction of the outer diameter side projection 122 and the outer diameter side step 127 can be absorbed by the gap g _1. Prevents protrusion to the side.

Further, the inner side surfaces 133 of the outer diameter side projections 122 of both the abutments 121 and 121 ′ face each other.
May be also between each other providing a predetermined gap g _2. The gap g ₂ absorbs dimensional tolerance in the width direction of each of the outer diameter surface side projection 122, prevents projecting to both side surfaces of each of the outer diameter surface side protrusion 122.

Furthermore, as shown in FIG. 15, a step 135 may be provided at the boundary between the outer diameter surface 131 or the inner diameter surface 137 and the side surface 134 of the ring main body. This step 1
The size of 35 may be any range as long as the sealability of the seal ring is maintained.

The gaps g ₁ and g ₂ are not particularly limited, but are each about 5 to 50% of the radial length or the axial length of the rectangular section of the seal ring, preferably about 5 to 50%. About 25%, more preferably about 5 to 10%
And preferably on one or both sides of the seal ring. Specifically, the lower limits of the gaps g ₁ and g ₂ are preferably 0.05 mm, more preferably 0.1 mm,
0.2 mm is more preferred. In addition, the upper limit value is .0.
5 mm is preferred, 0.4 mm is preferred, and 0.3 mm is more preferred. Any of the above numerical ranges may be selected in a range exceeding the lower limit and less than the upper limit.

The shape of the chamfered portion or the fillet portion may be either a curvature or a slope, but a more preferable shape is a chamfered shape having a curvature. The dimension near the minimum value of the chamfered portion or the fillet portion is about 5% to 50%, preferably about 5% to 25% of either the axial dimension or the radial dimension of the seal ring cross section.
%. If this value is too small, it is conceivable that the mating member may be damaged when there is a slight amount of protrusion at the abutment portion.

On the other hand, the dimension near the maximum value of the shape of the chamfered portion or the fillet portion of the curvature or the slope is determined by any one of the outer diameter of the seal ring, the inner diameter, and the diameter of the intermediate portion thereof. It may be about 5 to 50%, preferably about 25 to 50%. If this value is too large, the effect of providing the chamfered portion is weakened, and only a chamfered portion substantially equivalent to the curvature of the outer diameter of the seal ring can be formed, and the protrusion amount of the abutment portion is set to zero, or We cannot expect to reduce it. In any case, the size of the chamfered portion may be in the range of not less than or exceeding these minimum values and not more than or less than these maximum values.

In addition, at least one or more of these, such as the abutment shape of the shape of the present invention, the groove shape of the side surface, and the step portion at the boundary portion between the outer diameter surface or the inner diameter surface and the side surface of the ring main body, preferably. Is a seal ring that satisfies all three types, and a seal ring of the composition material of the present invention can provide a seal ring with considerably superior performance.

(Material of Seal Ring) Examples of the heat-resistant synthetic polymer used for the seal ring of the present invention include the following.

Any one resin 90 to 50 selected from the group consisting of polyetherketone resins such as polyetheretherketone resin, polyethernitrile resin, wholly aromatic thermoplastic polyimide resin, and polyamide 4-6 resin The main components are 10 to 50% by weight of a reinforcing fiber such as a carbon fiber, 2 to 25% by weight of a lubricity imparting agent such as a fluororesin if necessary, and 10 to 40% by weight of a powdery talc if necessary. Resin composition. 90-50% by weight of any one resin selected from the group consisting of polyetherketone resins such as polyetheretherketone resin, polyethernitrile resin, wholly aromatic thermoplastic polyimide resin, and polyamide 4-6 resin; Reinforcing fiber such as carbon fiber 10-50
% By weight, if necessary, a lubricity imparting agent 2 such as a fluororesin
25% by weight, if necessary powdered calcium compound 1
A resin composition containing 0 to 40% by weight as a main component.

Further, depending on the specification and use, 30 to 82% by weight of the heat-resistant synthetic polymer, 5 to 45% by weight of reinforcing fibers such as carbon fibers, and 2 to 25% by weight of a lubricity imparting agent such as a fluororesin. A resin composition comprising: A resin composition comprising 30 to 82% by weight of the heat-resistant synthetic polymer, 5 to 45% by weight of a reinforcing fiber such as a carbon fiber, 2 to 25% by weight of a fluororesin, and 10 to 40% by weight of powdery talc. 30 to 82% by weight of the heat-resistant synthetic polymer, 5 to 45% by weight of reinforcing fiber such as carbon fiber, 2 to 25% by weight of fluororesin, 10 to 40% by weight of powdery talc, and 1 to 10% by weight of molybdenum disulfide % Of the resin composition. A mixture containing 10 to 40% by weight of a calcium-based powder filler instead of 10 to 40% by weight of the powdery talc. An aromatic polyamide fiber of 5 to 45% by weight instead of the carbon fiber of 5 to 45% by weight. 5 to 45% by weight of aromatic polyamide fiber is blended instead of 5 to 45% by weight of carbon fiber, and 10 to 40% by weight of calcium powder filler is blended instead of 10 to 40% by weight of powdered talc. Resin composition.

The details will be described below. The polyether / ether ketone resin used in the present invention (hereinafter referred to as PEEK
, Etc.), a thermoplastic aromatic polyetherketone resin (hereinafter, referred to as PEK resin), a polyether nitrile resin (hereinafter, referred to as PEN), a wholly aromatic thermoplastic polyimide resin (hereinafter, referred to as TPI), Alternatively, a polyamide 4-6 resin (hereinafter, referred to as PA4-6) is used as a molding base material of the oil seal ring. Such a synthetic resin has excellent mechanical properties, electrical properties, and chemical resistance in addition to high heat resistance and flame resistance, and well-known resins that are commercially available can be used. . That is, as a specific example, PEEK manufactured by Mitsui Toatsu Chemicals, Inc .: VICTREX-PEEK150P,
Victrex as PEK resin: VICTREX
-PEK220G, manufactured by Idemitsu Kosan Co., Ltd. as PEN: ID3
00, TPI manufactured by Mitsui Toatsu: Aurum 450, P
A46 manufactured by Nippon Synthetic Rubber Co .: Stanyl TW300
And the like. The mixing ratio of any one resin selected from the group consisting of PEK resin such as PEEK, PEN, TPI, or PA46 is 90 to 50% by weight. This is because if the amount is less than 50% by weight, the strength is reduced. If the amount is more than 90% by weight, the reinforcing effect by the filler is not obtained, and the wear resistance is deteriorated. Because.

PEK such as PEEK used in the present invention
As the resin, a ketone polymer having a melting point of 330 ° C. or more can be used without limitation. The PEK resin is a resin in which an aromatic ring is bonded including both an ether bond (-O-) and a ketone bond (-CO-), and has, for example, a structure represented by the following formulas (1) to (4). Resins having units can be given. These are crystalline resins. These (Chem. 1) to (Chem. 4) may be copolymerized with (Chem. 5) and (Chem. 6) as necessary.
The bonding between the ether groups or the ketone groups is preferably a thermoplastic wholly aromatic polyether ketone resin in which all aromatic rings are bonded because of its excellent heat resistance.

These PEK resins are excellent in mechanical and electrical properties, chemical resistance, and thermal dimensional properties, and are used as an oil seal ring under high temperature such as heat fixing such as heat fixing and an automatic transmission. However, the dimensional change is small, and it is suitable for use at a high temperature with a seal ring having an abutment shape requiring such dimensional accuracy.

[0065]

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(N represents an integer)

[0067]

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[0069]

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[0071]

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[0073]

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(N represents an integer)

[0075]

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(N represents an integer.) Of the above resins, the glass transition point (T
g) is about 165 ° C. and the melting point (Tm) is 365 ° C. As a typical example, Victrex Limited: VIC
TREX-PEK 220G (trade name).
Further, the glass transition point (Tg) of the resin of the formula (2) is about 15
The melting point (Tm) is 0 ° C. and the melting point (Tm) is 334 to 337 ° C. As a typical example, Victrex-P: VICTREX-P
EEK150P (trade name) may be mentioned. Further, the resin of formula (3) has a glass transition point (Tg) of about 160 ° C. and a melting point (Tm) of 360 to 380 ° C. As a typical example, HOSTATEC (trade name) manufactured by Hoechst, Germany No. Further, the glass transition point (Tg) of the resin of the chemical formula (4) is about 170 to 175 ° C., and the melting point (Tm) is 375.
To 381 ° C., and as a typical example, ULTRA PEK-A1000 manufactured by BSF, Germany
(Product name).

The above-mentioned PA 46 is a linear aliphatic polyamide represented by the following chemical formula 7, and may be a well-known resin industrially produced by a polycondensation reaction between diaminobutane and adipic acid. it can.

[0078]

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Such a polyamide 4-6 resin has the lubricity, abrasion resistance and chemical resistance generally provided by a polyamide, and also has a polyamide 6 resin and a polyamide 6-6 resin.
6 is superior to resin 6 in terms of mechanical strength such as tensile strength, flexural strength and flexural modulus and heat resistance. Commercially available polyamide 4-6 resins include: Nippon Synthetic Rubber Co., Ltd .: Stanyl TW300, manufactured by Unitika Ltd .:
F5001 and the like.

Next, as the reinforcing fiber in the present invention, a carbon-based fiber can be mentioned. As an example, the carbon-based fiber is preferably a pitch-based or PAN-based carbon fiber. 25μ
m, preferably 5 to 20 μm, and an aspect ratio of 1 to 80, preferably 5 to 50. This is because if the average fiber diameter is smaller than 1 μm, aggregation between fibers occurs, making uniform dispersion difficult,
If the thickness exceeds 80 mm, the soft mating material is worn. If the aspect ratio is less than 1, the reinforcing effect of the matrix itself is impaired, and the mechanical properties are reduced. On the other hand, if the aspect ratio exceeds 80, uniform dispersion during mixing becomes extremely difficult. This is because it is not preferable because the wear characteristics are disturbed and the quality is deteriorated.

More specifically, a carbon fiber as an example of the carbon fiber used in the present invention is 1000 ° C. or higher, preferably 1 ° C., which is currently widely used.
As long as it can withstand a high temperature of 200 to 1500 ° C., it can be used irrespective of the type of raw material, such as rayon type, polyacrylonitrile type, lignin-poval type mixture, special pitch type and the like. The shape may be a single fiber, either long or short, or may be in the form of a product such as cloth, felt, paper, yarn, etc., which has undergone primary processing, such as knitted or woven fabric, nonwoven fabric, thread, or string. .

Further, the material is not particularly limited.
Any of a pitch type, a PAN type and a carbon type may be used. For example, the fiber diameter is 1 to 25 μm, preferably 4 to 20 μm.
μm, fiber length about 0.01 to 1 mm, preferably 0.01
A thickness of 0.5 mm is suitable because it is uniformly dispersed in the resin composition and sufficiently reinforced.

In consideration of appropriate mechanical properties such as elastic modulus and tensile strength, aggressiveness to a counterpart material such as a cylinder and a piston, and fluidity of a resin composition at the time of molding, the diameter of the carbon-based fiber is average. 5 to 14 μm, and the fiber length is 0.01 to 0.3
mm.

Incidentally, these fibers may be shortened due to breakage during melt-kneading, injection molding or the like.

The carbon-based fiber is produced by firing various organic polymer fibers as described above at an average temperature of about 1000 to 3000 ° C. This structure is composed mainly of hexagonal mesh planes of carbon atoms. Assuming that the mesh plane is arranged almost parallel to the fiber axis, a PA having high orientation and anisotropy
N-based and liquid crystal pitch-based carbon fibers
On the other hand, a pitch-based carbon-based fiber having an isotropic property can be cited as one in which the mesh planes are randomly gathered.

The highly oriented and anisotropic carbon fiber is
Highly excellent in elasticity and tensile strength in a specific direction, the isotropic carbon-based fiber can relatively endure a load received from all directions.

The pitch-based carbon fiber is, for example,
There are structurally isotropic pitch-based carbon-based fibers such as petroleum pitch produced as a by-product in petroleum refining, and structures in a certain direction, for example, anisotropic pitch-based carbon-based fibers having optical anisotropy. .

The isotropic pitch-based carbon fibers are classified into petroleum-based, coal-based, synthetic products, liquefied coal-based fibers, and the like. It is manufactured by

Further, the pitch of the liquid crystal pitch-based carbon fiber is heated in an inactive gas phase so as to be 350 to 50%.
After being brought into a liquid crystal state at 0 ° C., it is solidified to form coke. When this is melt-spun and heated in an oxidizing atmosphere, it becomes an oxidized fiber to become an insoluble and infusible fiber, which is further manufactured by, for example, heating the fiber to about 1000 ° C. or more in an inert gas phase.

These have an average tensile modulus of 30 to 50 G.
A medium or high modulus of about 240 to 500 GPa can be selected on demand from a low modulus of about Pa, and fibers with excellent mechanical properties of tensile strength can be mixed with a predetermined resin composition. Thereby, a sealing material having appropriate mechanical strength can be obtained.

As an example of such a pitch-based carbon fiber, Kureha H107T, M20 manufactured by Kureha Chemical Co., Ltd.
The "Kureha" (trade name) series such as 7S (the fiber diameter is 12 to 13 μm) can be cited.

The PAN-based carbon fiber can be manufactured by heating and baking acrylic fibers such as polyacrylonitrile fibers. Depending on the heating temperature, a predetermined tensile modulus can be obtained.
When heated at ~ 1500C, the tensile modulus is 20-30 on average.
GPa and tensile strength are 300-6000 MPa on average. Moreover, it heats at about 2000 degreeC, and makes a tensile elasticity modulus 350-500 GPa on average, Preferably it is 400-500 average.
GPa can also be used. Therefore, the PAN-based carbon fiber is a fiber having a high tensile strength, and a tensile strength in the range of 500-6000 MPa on average is obtained depending on the heating temperature, and a fiber having an average in the range of 500-3000 MPa can be produced as required. it is conceivable that. If these values are too low, reinforcement with regard to compression creep and the like cannot be expected, and if these values are too high, it is expected that they will attack mating materials such as pistons and cylinders.

Examples of the PAN-based carbon fiber include the whole series of "Vesfight" (trade name) manufactured by Toho Rayon Co., and specific examples thereof include Vesfight HTA-CMF-0040-E and Vesfight. HT
A-CMF-0160-E, Vesfight HTA-CM
F-1000-E, Vesfite HTA-C6-E and the like (both with a fiber length of 7 to 8 μm). Also,
The "Torayca" (trade name) series manufactured by Toray Co., Ltd. is also included in general, and specific examples thereof include Torayca MLD-300 and Torayca MLD-1000.

The tensile strength of these carbon fibers is preferably 550 to 1000 MPa, and the Vickers hardness (Hv) is preferably 400 to 600. When the tensile strength is less than 550 MPa or when the Vickers hardness (Hv) is less than 400, the reinforcing effect of adding the carbon fiber cannot be expected, and the tensile strength is 100%.
When the pressure is greater than 0 MPa or Vickers hardness (Hv) is 6
When the value is larger than 00, it is considered that the partner material is attacked and worn, which is not preferable.

The carbon fiber has an average fiber diameter of about 1 to 20 μm, preferably about 5 to 18 μm.
And an aspect ratio of about 1 to 80, more preferably about 5 to
50 are preferred. Because the average fiber diameter is about 1μ
If it is thinner than m, coagulation between fibers occurs and uniform dispersion becomes difficult, and if it is thicker than about 20 μm, the soft mating material is worn away.
At 18 μm, such a tendency is further reduced, which is preferable. On the other hand, if the aspect ratio is less than about 1, the reinforcing effect of the matrix itself is impaired, and the mechanical properties are reduced. It will come and cause quality degradation. When the aspect ratio is about 1 to 80, such a tendency is relatively small, and preferable results are obtained.

These carbon fibers are hardly affected by chemicals such as acids and alkalis, and have abrasion resistance.

In order to enhance the adhesion between these carbon fibers and the heat-resistant resin such as the PEK resin, and to improve the mechanical properties and the like of the sliding material in oil, the surfaces of these carbon fibers are epoxy-coated. The surface treatment may be performed with a treating agent containing a base resin, a polyamide resin, a polycarbonate resin, a polyacetal resin, or the like, or a silane coupling agent.

Among the carbon fibers, the tensile strength is 490 to 1000 MPa, preferably 550 to 98 MPa.
Those having a range of 0 MPa and a tensile modulus of elasticity of 30 to 50 GPa are particularly preferred. If the tensile strength and the tensile modulus are less than the lower limit values, the reinforcing effect by the carbon fiber cannot be obtained, and if the values exceed the upper limit values, it is estimated that the wear resistance is poor.

The mixing ratio of the carbon fiber in the whole composition is 10 to 45% by weight, preferably 15 to 40% by weight, and more preferably 15 to 30% by weight. If the amount is less than 10% by weight, the wear resistance of the sliding material in oil can hardly be improved, and if the amount exceeds 45% by weight, the melt fluidity is remarkably reduced and the moldability is deteriorated.

An aromatic polyamide fiber, which is an example of another reinforcing fiber, is a well-known fibrous heat-resistant resin represented by the following formula (8). Any of those bonded to each other and those in which the aromatic ring is bonded at the para position by an amide bond may be used.

[0101]

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Examples of the para aromatic polyamide fiber include a para aromatic polyamide fiber containing a repeating unit represented by the following formula (9).

[0103]

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The para-aromatic polyamide fibers added to such a composition have high elasticity and high strength in the axial direction since the molecular chains are arranged in the fiber axis direction, but have high molecular weight in the perpendicular direction. The power is weak. As described above, the para-aromatic polyamide fiber can improve the abrasion resistance of the compounded resin composition by the strength in the axial direction, while the molecular chain buckles when subjected to a compressive force in the direction perpendicular to the fiber. Or, it is considered that the soft sliding partner material is not damaged because it is easily broken.

When an aromatic polyamide fiber other than the para-based polyamide is employed, a material containing a predetermined amount of a fluorine-based resin such as an ethylene tetrafluoride resin is added, so that a soft sliding material similar to the above-mentioned composition can be obtained. A composition excellent in wear resistance without damaging the moving partner material.

The para-aromatic polyamide fiber is composed of a polymer containing a repeating unit shown in the above-mentioned chemical formula (3).
Is different from the meta-based aromatic polyamide resin shown in FIG. Commercially available para-aromatic polyamide fibers include Kevlar manufactured by DuPont-Toray-Kevlar, Twaron manufactured by Nippon Aramid, and Technora manufactured by Teijin.

[0107]

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When aromatic polyamide fibers other than para-based aromatic polyamide fibers (ie, meta-based aromatic polyamide fibers) are used, an ethylene tetrafluoride resin (hereinafter, referred to as a fluororesin) is used as the fluororesin.
Called PTFE. ) And a predetermined amount thereof is added. In this case, another fluorine-based resin can be used in combination. Commercial products of the meta-based aromatic polyamide fiber include Nomex manufactured by DuPont-Toray-Kevlar, and Conex manufactured by Teijin Limited.

The form of such an aromatic polyamide fiber has a fiber length of about 0.15 to 3 mm and an aspect ratio of about 1 to 2
It is in the range of about 30.

As the form of the aromatic polyamide fibers, those having an average fiber diameter of about 1 to 25 μm are preferable, and those having an average fiber diameter of about 5 to 20 μm are more preferable. Further, the aspect ratio is preferably about 1 to 60, and more preferably about 15 to 40.

When the fiber length of the aromatic polyamide fiber is less than the predetermined range, the abrasion resistance becomes insufficient, and when the fiber length exceeds the above range, dispersion in the composition is poor, which is not preferable. Also,
If the aspect ratio is less than the above range, the powder is close to a powder shape, and the effect of improving abrasion resistance becomes insufficient. If the aspect ratio exceeds the above range, uniform dispersion in the composition is difficult, which is not preferable.

In the case of a fine fiber having an average fiber diameter of less than about 1 μm, coagulation occurs between fibers when mixed with a matrix, and uniform dispersion is difficult.
In the case of a large diameter exceeding μm, the composition slides and wears a soft mating member, and the average fiber diameter is about 5 to 20 μm,
Preferably, the thickness of 5 to 15 μm is extremely preferable since no such tendency is observed. On the other hand, if the aspect ratio is less than about 1 μm, there is no reinforcing effect of the matrix and the mechanical properties are low, and if the aspect ratio exceeds about 60, uniform dispersion during mixing becomes difficult, and the wear properties of the composition become non-uniform. It is. Commercially available aromatic polyamide fibers satisfying such conditions include Twaron (trade name) manufactured by Akzo.

Further, depending on the specification and use of the seal ring,
The mixing ratio of the above-mentioned aromatic polyamide fiber or the above-mentioned carbon-based fiber in the whole composition may be 5 to 45% by weight, preferably 10 to 30% by weight. This is because if the amount is less than 5% by weight, the wear resistance of the molded article is hardly improved, and if the amount exceeds 45% by weight, the melt fluidity is remarkably reduced and the moldability is deteriorated. The same blending ratio is 10
If it is 〜30% by weight, such a tendency hardly occurs, and preferable results can be obtained.

Fluorine resins, which are typical examples of the lubricity-imparting agent used in the present invention, among them, PTFE is a homopolymer of ethylene tetrafluoride, and a commercially available resin can be used as a resin which can be compression-molded. For example, KTL6 manufactured by Kitamura
10, 300H or the like. The mixing ratio of the above-mentioned lubricity imparting agent is 2 to 25% by weight, preferably 5 to 25% by weight. When the content is less than 2% by weight, the improvement of the sliding properties such as self-lubricating property and wear resistance is not remarkably recognized,
On the other hand, if it exceeds 25% by weight, the moldability deteriorates and the mechanical properties also deteriorate.

More specifically, for example, the perfluoro fluororesin used in the present invention is a fluororesin represented by polytetrafluoroethylene (hereinafter referred to as PTFE). This resin is in a state in which all around the carbon atoms that are the skeleton are surrounded by fluorine atoms or trace amounts of oxygen atoms, and due to the strong bond between C and F, the heat resistance temperature is relatively high even among fluorine-based resins, Also, it has excellent properties such as low coefficient of friction, non-adhesion and chemical resistance. PTFE is a resin that can be compression-molded with a tetrafluoroethylene homopolymer and has a thermal decomposition temperature of about 508 to
538 ° C. For this, commercially available ones can be used, and for example, KTL610, 400H manufactured by Kitamura Corporation can be used.

As the perfluoro-based fluororesin, PT
In addition to FE, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA, thermal decomposition temperature of about 464 ° C. or higher), tetrafluoroethylene-hexafluoropropylene copolymer (FEP, thermal decomposition temperature of about 419
C. or higher), and a tetrafluoroethylene-hexafluoropropylene-perfluoroalkylvinyl ether copolymer (EPE, pyrolysis temperature: about 440 ° C.).
In addition, in addition to these, polychlorotrifluoroethylene (PCTFE, pyrolysis temperature of about 347 to 418 ° C.), tetrafluoroethylene-ethylene copolymer (ETFE,
Thermal decomposition temperature of about 347 ° C. or higher), chlorotrifluoroethylene-ethylene copolymer (ECTFE, thermal decomposition temperature of about 3
30 ° C or higher), polyvinylidene fluoride (PVD
F, thermal decomposition temperature of about 400 to 475 ° C.), polyvinyl fluoride (PVF, thermal decomposition temperature of about 372 to 480 ° C.) and the like, and these may be mixed.

The perfluoro-based fluororesin is, for example, about 1:10 to 10: 1 of the above-mentioned fluororesin monomer.
Or a fluorinated polyolefin such as a terpolymer, etc., having a polymerization ratio of 3, and these exhibit properties as a solid lubricant. Among these, PTFE is preferable because it has excellent properties such as heat resistance, chemical resistance, non-adhesion, and low coefficient of friction.

[0118] These perfluoro-based fluororesins have a relatively high differential pyrolysis onset temperature and are preferred. For example, PT
The thermal decomposition points of FE and PVDF are about 490 ° C and about 3
50 ° C., and their differential pyrolysis onset temperatures are about 555 ° C. and about 460 ° C., respectively.
PFA, FEP and the like are preferable because of their excellent high-temperature characteristics.
For this reason, it can relatively endure the heat history in the process of melting the composition containing the resin to form a sliding material in oil.

Among them, PTFE has a melting point of about 327 ° C., and has a melt viscosity of about 10 ¹¹ to 1 even at about 340 to 380 ° C.
0 ¹² poise and higher, it is difficult to flow even beyond the melting point, among the fluorine resin is believed to be a resin having excellent most heat resistance. When such PTFE is adopted, it may be a powder for molding or a fine powder for a so-called solid lubricant, and a commercially available product manufactured by DuPont-Mitsui Fluorochemical Co., Ltd .: Teflon 7J , TLP-1
0, manufactured by Asahi Glass Co., Ltd .: Fluon G163, manufactured by Daikin Industries, Ltd .: Polyflon M15, Lubron L5, and the like. Further, PTFE modified with an alkyl vinyl ether may be used. Generally, PTFE is
As a homopolymer of ethylene tetrafluoride, a commercially available resin can be used as a resin that can be compression-molded. For example, 400H manufactured by Kitamura Corporation can be used.

PFA: Teflon PFA-J, MP-10, manufactured by Mitsui / Dupont Fluorochemicals; Hostaflon: TFA, Neokin PFA: manufactured by Daikin Industries; FEP: Mitsui / Dupont Fluorochemicals : Teflon FEP-J, manufactured by Daikin Industries, Ltd .: Neoflon FEP, ETFE manufactured by Mitsui / Dupont Fluorochemicals: Tefzel, Asahi Glass Co .: Aflon COP, and EPE manufactured by Mitsui / Dupont Fluorochemicals: Teflon EPE-J, and the like.

PTFE, PFA and FEP are preferable among fluororesins because they have a relatively high heat resistance temperature. Examples of PVDF include KF Polymer manufactured by Kureha Chemical Industry Co., Ltd.

These fluororesins, in particular, perfluorofluorinated resins are used in an amount of 2 to 25 parts by weight, preferably 5 to 25 parts by weight.
By adding parts by weight, the mechanical properties are excellent, the compressive strength of a standard product or the like is good, in addition to the excellent creep resistance and heat resistance of, for example, about 50 to 200 MPa, and the properties such as excellent oil resistance and chemical resistance. It is thought that the impact resistance, the fatigue resistance, the wear resistance and the like can be improved.

If the added amount is less than 2 parts by weight, these effects cannot be expected, and no improvement in the sliding properties such as self-lubricating property and wear resistance is remarkably recognized. On the other hand, if the amount exceeds 25 parts by weight, the load applied to a cylinder of a melt molding machine or the like during granulation or injection molding due to their melt viscosity or the like is large, moldability is deteriorated, and stable granulation, injection moldability and Dimensional accuracy cannot be expected, and mechanical characteristics may be reduced.

When PTFE is added in powder form to a heat-resistant resin such as PEK resin, it can be used in powder form without any particular limitation on its shape and size.
1 to 70 μm, preferably 10 to 70 μm
Is preferred in order to make the resin composition uniform.

Further, instead of virgin PTFE powder,
Recycled PTFE powder can also be used favorably. Recycled PTFE powder is a powder obtained by baking a virgin material once and then pulverizing it, and has a property that it is difficult to be fibrous, and maintains a blended resin composition at a good melt viscosity. Therefore, it is considered that not only the recycled PTFE powder but also the case where the recycled PTFE powder is added to the virgin material can be an excellent additive for improving the moldability.

The mixing ratio of such a lubricity-imparting agent such as a perfluoro-based fluororesin in the total composition is more preferably 5 to 15% by weight than the above-mentioned mixing ratio. If it is less than 5% by weight, there are problems of sliding characteristics and abrasion resistance.
If the amount exceeds the weight percentage, there are problems such as moldability.

As additives other than the above-mentioned materials, for example, self-lubricating properties, as long as the effects of the present invention are not impaired,
Solid lubricants, fillers such as talc, powder fillers, pigments, and other materials that are stable at high temperatures of about 350 ° C. or higher may be appropriately mixed for the purpose of improving mechanical strength, thermal stability, and coloring, etc. . For example, in order to further improve the lubricity of the resin composition, an abrasion resistance improving agent can be blended. Specific examples of the wear resistance improver include carbon,
Graphite, mica, wollastonite, phosphate,
Examples include carbonates, stearates, ultrahigh molecular weight polyethylene, whiskers such as calcium sulfate, and powders of metal oxides such as molybdenum disulfide. It is preferable that the balance of the heat-resistant resin when adding such an additive is not less than 40% by weight, preferably 50% by weight.

More specifically, the powdered talc used in the present invention has an average particle size of 0.5 to 40 μm, preferably 1 to 3 μm.
Those having a thickness of 0 μm are preferred. In the case of small particles having a particle size of less than 0.5 μm, agglomeration between particles occurs, making uniform dispersion difficult.
This is because large grains having a particle size exceeding the above are not preferable because the surface smoothness is deteriorated. The proportion of such talc is 10 to 4
0% by weight, preferably 10 to 30% by weight. If the content is less than 10% by weight, the soft mating material is worn, and
If the content is more than the weight percentage, the moldability deteriorates, and the mechanical properties also deteriorate.

Examples of the powdered calcium compound used in the present invention include calcium carbonate, sulfate, oxide and hydroxide, and among them, calcium carbonate and calcium sulfate are preferable. These calcium compounds have an average particle size of 0.5 to 40 μm, preferably 1 to 30 μm. This is because small particles having a particle size of less than 0.5 μm cause aggregation between particles, making uniform dispersion difficult, and large particles having a particle size of more than 40 μm deteriorate surface smoothness, which is not preferable. The mixing ratio of such a calcium compound is 10
-40% by weight, preferably 10-30% by weight. If the content is less than 10% by weight, the soft mating material is worn out,
If the content exceeds 0% by weight, the moldability deteriorates and the mechanical properties also deteriorate.

Further, for example, an aromatic polyester resin is prepared by further mixing about 1 to 10% by weight of a copolymer containing this as a copolymerization component in addition to a polyoxybenzoyl polyester represented by the following formula (11). Is also good. As such an aromatic polyester resin, as a commercially available product of the polyoxybenzoyl polyester represented by Chemical Formula 5, there may be mentioned, for example, Econol E101 manufactured by Sumitomo Chemical Co., Ltd.

[0131]

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Further, molybdenum disulfide is added as an essential component in order to improve the wear resistance, and its mixing ratio is 1 to 10% by weight. Because, when the amount is less than the above-mentioned predetermined range, the improvement of the sliding properties such as self-lubrication and wear resistance is not remarkably recognized, and when the amount exceeds the above-mentioned predetermined range, the mechanical strength is reduced, and This is because no improvement in wear resistance commensurate with the compounding amount is found.

The method of adding and mixing various additives to these heat-resistant resins is not particularly limited, and a method generally used widely, for example, a resin as a main component,
The other various raw materials are individually or individually dry-mixed by a mixer such as a Henschel mixer, a ball mill, a tumbler mixer, etc., and then supplied to an injection molding machine or a melt extrusion molding machine having good melt mixing properties, or a hot roll. , A kneader, a Banbury mixer, a melt extruder, or the like.

Further, when the above composition is molded into a sliding material in oil, the molding method is not particularly limited, and ordinary methods such as compression molding, extrusion molding, injection molding and the like, or the composition may be used. After melt-mixing, the mixture can be pulverized by a jet mill, a freeze pulverizer, or the like, and classified into a desired particle size. In particular, the injection molding method is excellent in productivity and can provide an inexpensive sliding material in oil.

The pellets and the like thus obtained may be subjected to a drying treatment similar to the heat treatment described below before molding. It is considered that by sufficiently evaporating the water and the like from the pellets and the like, it is possible to prevent the sliding material in oil from swelling and lowering the strength.

The sliding material in oil obtained in this manner is used at a temperature of about 100 to 350 ° C. to obtain a slidable material in oil at about 100 to 350 ° C. for about 0.1 to 0.1 mm in order to secure dimensional stability when used at a high temperature except for heat setting and distortion during molding. 2
It is desirable to perform annealing heat treatment for about 4 hours.

For example, taking PEK resin as an example, the annealing heat treatment temperature is lower than the melting point of PEK resin, for example, about 140 ° C.
~ 330 ° C, about 143 ~ 300 depending on size and shape
It is appropriate to carry out at about 150C or about 150-260C. These PEK resins have high rigidity over a wide temperature range, have excellent impact resistance, are resistant to distortion such as creep, and are resistant to most types of oils and chemicals. . Further, these resins are crystalline, and have properties such as an increase in strength and rigidity due to an increase in crystallinity, an improvement in wear resistance and lubricity, and a decrease in coefficient of thermal expansion and water absorption.

If the heat treatment temperature is lower than about 140 ° C. to 150 ° C., crystallization takes a long time and the efficiency is poor, and it is difficult to remove a slight distortion of the sliding material in oil. It is considered that the property is hard to be obtained.

Further, taking PA46 as an example, the annealing heat treatment temperature is lower than the melting point of PA46, preferably about 150 ° C.
Suitably, it is performed at about 260 ° C. Polyamide 4-6 resin has high rigidity over a wide temperature range,
This resin has excellent impact resistance, is resistant to distortion such as creep, and is resistant to most types of oils and chemicals. This resin is crystalline, has a high crystallization rate, and has a higher water absorption than the polyamide 6-6 resin.
It is believed to be less than resin. Further, it has properties such as an increase in strength and rigidity due to an increase in crystallinity, an improvement in wear resistance and lubricity, and a decrease in thermal expansion coefficient and water absorption.

At a low heat treatment temperature of less than about 150 ° C.,
It is considered that crystallization takes a long time to progress and the efficiency is low, it is difficult to remove a slight distortion of the molded body, and it is difficult to obtain dimensional stability.

If the annealing heat treatment temperature exceeds the melting point or heat deformation temperature of the sliding material in the seal ring oil by about 20 to 30 ° C., the effect of the heat history on the resin is considered to be unfavorable because it is unfavorable. The heat treatment is preferably performed. During the heat treatment, before reaching the predetermined temperature, for example, room temperature, about 80 ° C., about 130 ° C., about 180 ° C., about 220 ° C.
℃, about 230 ℃, about 260 ℃, about 300 ℃, divided into several stages, in the range of about 15 to 180 minutes,
The temperature may be gradually raised about every 15 to 60 minutes, and the temperature may be kept constant at the optimum temperature within the temperature range and within the time range. The maximum temperature holding time in that case is about 15 to 4
It may be about 80 minutes. If the holding time of the maximum temperature is shorter than the predetermined time, the crystallization of the resin becomes insufficient and the dimensional stability is deteriorated. In addition, severe thermal deformation occurs, and it is difficult to reduce the manufacturing cost in view of an increase in energy consumption of an electric furnace or the like and an increase in manufacturing time.

When the temperature is raised to about 85 to 120 ° C., the temperature may be maintained at such a constant temperature. By doing so, the moisture slightly captured in the oil-in-oil sliding material can be dried and then crystallized.
On the other hand, it is not preferable to end the heat treatment by rapidly heating in a short time. This is because the water evaporates beyond the boiling point, and the volume expansion at that time increases the possibility that a malfunction such as “swelling” occurs in the sliding material in oil.

The cooling after the crystallization step may be carried out through the reverse of the above-mentioned temperature raising step, or may be carried out gradually over about 60 to 180 minutes.

By performing the above-described heat treatment process, the occurrence of problems such as swelling of the sliding material in oil is prevented as much as possible, and the crystallization of the resin is reliably and gradually progressed. It is possible to provide a sliding member in oil with high dimensional accuracy by improving dimensional stability.

The surface roughness of the sliding surface of at least one of the sliding member in oil and the mating member is measured by an evaluation method defined by JIS such as Rmax, Ra, Rz, etc.
5 μm or less, preferably about 8 μm or less, and about 3 μm
The following is more preferred. This is because, if the surface roughness exceeds the above-mentioned predetermined range, the sliding surface is likely to have many scratches, which is considered to cause wear. The lower limit of the surface roughness is set to about 0.5 in consideration of the efficiency at the time of processing.
It may be about 1 μm or more.

In addition, since it takes a long time to perform a process such as finishing of the surface of the mating material, it may be inefficient or may be affected by the formation of a transfer film of the resin material. It is presumed that under the conditions, the distance may be set to be about 3 to 8 μm or less.

The counterpart materials such as pistons and cylinders are carbon steel such as S45C and SCM420H, and FCD45.
Or a hard material such as a hardened material thereof, or a soft material such as an aluminum alloy such as ADC12. The mating material is preferably a cast metal which is generally excellent in terms of efficiency, productivity, price and the like during processing, and among them, a lightweight cast metal alloy such as ADC is preferred, but is not particularly limited.

[0148]

1 (a) to 1 (f) show a seal ring 20 of a first embodiment.
As shown in FIG. 2, step portions 26 are provided between both side surfaces 21 and the outer peripheral surface 24 of the ring, and between the both side surfaces 21 and the inner peripheral surface 25, respectively. (A)
As shown in FIG. 1, in addition to the step 26, a lubrication groove 22 penetrating from the inner peripheral side to the outer peripheral side is provided in the seal surface 21 on one side surface of the ring 20 at approximately three equally spaced positions. A similar lubrication groove 22 is provided on the other side of the seal surface 21 with a slight displacement. FIG. 1 (b)
1 to (f) show an enlarged view or a sectional view of FIG.

The step 26 between the ring side surface 21 and the outer peripheral surface 24 is formed by a surface 27 perpendicular to the ring side surface 21.
And a surface 27 ′ perpendicular to the outer peripheral surface 24, and
And an inclined surface 28 formed between the two right-angled surfaces 27 and 27 '.
5 has a surface 27 perpendicular to the ring side surface 21 and a surface 27 ′ perpendicular to the inner peripheral surface 25, and between the two perpendicular surfaces 27, 27 ′. And an inclined surface 28 formed by This step 26
Can be provided either at two locations around the ring side surface 21 and the outer peripheral surface 24 or at two locations around the ring side surface 21 and the inner peripheral surface 25. It can also be provided for all.

The provision of the step 26 facilitates separation of the mold at the time of molding, and also prevents the accumulation of oil impurities and abrasion powder during use. Can be prevented.

As shown in FIG. 1 (f), even if the inclined surface 28 is a square which is a flat surface,
8 may be a round shape having a curved surface. In addition, right angle plane 2
The angle between 7, 27 'and the inclined surface 28 is a right angle or an obtuse angle,
That is, the angle is preferably 90 ° or more and less than 180 °, 90 ° or more and 135 ° or less depending on specifications, or more than 90 ° and 120 ° or less.
° or less is preferred. In addition, by adjusting the angle, oil impurities and abrasion powder hardly accumulate, and the releasability from the injection mold is good. It is to be noted that the step portion is more efficient because the step portion can be easily formed in manufacturing an injection mold because the step portion is easier, and as a result, the cost is lower.

The lubrication groove 22 has a depth of about 0.1 mm,
It is fine with a width of about 0.1 mm.
Even if it is provided in about several places, the sealability is not impaired. Further, a crowning 23 is applied to an open end of the lubrication groove 22 on the seal surface 21 side.

The height h of the step 26 is not particularly limited.
Alternatively, each is about 5 to 50% of the axial length, preferably about 5 to 25%, and more preferably about 5 to 1%.
It is preferably set to about 0% and provided on one or both sides of the seal ring 20. Specifically, the lower limit of the height h of the step 26 is preferably 0.05 mm, and the height h is 0.1 m.
m is preferable, and 0.2 mm is more preferable. The upper limit is preferably 0.5 mm, more preferably 0.4 mm,
0.3 mm is more preferred. Any of the above numerical ranges may be selected in a range exceeding the lower limit and less than the upper limit.

If the height h of the step is too small, there is a possibility that a problem will be caused when a gap between the movable mold and the fixed mold occurs in a relatively short cycle due to long-term use of the mold. If the amount is too large, the area of the seal portion of the seal ring, that is, the so-called seal land decreases, so that reliable and good sealing characteristics cannot be expected.

The shape of the abutment 30 is arbitrary such as a step type, a straight type, and an angle type. In addition 30
Although there may be no endless shape, an abutment shape having a complicated shape shown in FIGS. 1 and 3 to 15 is employed.

FIG. 2 shows the position of the mating surface 31 of the mold 29 when the above-mentioned seal ring 20 is injection-molded with a synthetic resin. That is, the mating surface 31 is set at one end of the outer peripheral surface 24 on the side of the step 26. When the mating surface 31 is set at such a position, the burr 32 is formed at a position away from the lubrication groove 22, so that the lubrication groove 22 is not closed.

FIGS. 3A and 3B show a seal ring 20 according to a second embodiment. In this case, the lubricating groove 22 is formed by a circumferential groove 33 formed over the entire periphery at the center of the sealing surfaces 21 on both sides.
And an outer radial groove 34 and an inner radial groove 35 formed in the outer circumferential direction and the inner circumferential direction, respectively, from the circumferential groove 33, and the positions of the outer radial groove 34 and the inner circumferential groove 35 are shifted in the circumferential direction. ing.

The lubrication grooves 22 of the seal ring of the third embodiment shown in FIGS. 4A and 4B are composed of an outer radial groove 34 and an inner radial groove 35 formed at the same position as the peripheral groove 33.

FIGS. 5A and 5B show various examples of the shape of the various step portions 26 of the seal ring. In each case, there is a step between the mating surface 31 of the mold and the lubrication groove 22. This prevents the lubrication groove 22 from being blocked by burrs. Also,
In any of these, since the mating surface 31 of the mold coincides with the right-angled surface 27 ', even if the mating surface of the fixed mold and the movable mold slightly shifts, a portion protruding toward the outer peripheral surface 24 or the inner peripheral surface 25 is generated. Nothing.

(Durability Test) (1) 50 parts by weight of a polyetheretherketone resin (VICTREX-PEEK 150P) as a main material, and carbon fiber (Kureha Chemical: Kureha M207S (fiber diameter: 12 to 13 μm) , Aspect ratio 4
8, pitch type)) A seal ring 20 having a shape of the first embodiment shown in FIG. Was obtained by injection molding. The cross section of the seal ring 20 is substantially rectangular, and a step 26 is provided at four corners. This seal ring 20 has an outer diameter of 45 m.
m, ring width 2.4 mm, ring thickness 2.3 mm, outer peripheral surface (sliding portion) width 1.5 mm, and side surface (sliding portion) width 1.8 mm. The lubricating groove 22 was formed at three places over the entire circumference at a depth of 0.1 mm and a width of 0.1 mm, and was formed by shifting the position of the lubricating groove 22 by about 10 ° on the sealing surfaces 21 on both sides. A crowning 23 was applied to a corner of each lubrication groove 22. The seal ring 20 was subjected to an endurance test, and the rotational torque, the wear on the side surface of the ring, and the wear amount of the mating shaft groove were measured. The shaft material is aluminum alloy ADC1 for die casting.
2 was used. Table 1 shows the results of the durability test. The conditions of the durability test are as follows. Oil pressure: 0.8 MPa Revolution: 7000 rpm Temperature: 120 ° C. Time: 100 hr. Oil: Automotive automatic transmission oil Showa Shell Sekiyu KK Dexilon II Cylinder (rotation): S45C Shaft (fixed): ADC12

(2) Seal ring 20 made of the same material as that used in the durability test described above, having an outer diameter of 45 mm and a sectional shape of 2.3 mm
A comparative example 1 is a rectangle having a size of × 2.4 mm and having no steps and lubricating grooves (see FIG. 6). The same material and the same size as in Comparative Example 1 were used on both sides of the seal ring 20 of the same size.
Comparative Example 2 has recesses 36 formed on the inner peripheral side with a length of 15 ° in the circumferential direction at intervals of ° (see FIG. 7).
The comparative examples 1 and 2 were subjected to a durability test under the same conditions as described above. Table 1 shows the results.

[0162]

[Table 1]

(Results) In the embodiment, the rotational torque is not inferior to those of the comparative examples 1 and 2, and the abrasion of the ring side surface and the mating groove is small. This is because the oil leaks inward and outward through the lubrication grooves 22 penetrating inward and outward, thereby forming an oil film over the entire width of the sliding contact surface on the side surface of the ring. This is because they are easily excluded. In addition, the leak amount is very small and the sealing performance is not impaired.

FIG. 18 shows leak measurement data of a seal ring made of a thermoplastic aromatic polyetherketone resin and a conventional seal ring made of PTFE. FIG. 18 shows the relationship between the oil temperature and the leak at various joints.

Looking at the straight cut ring,
Leakage increases with increasing oil temperature and decreases at a certain temperature. This is related to the fact that the oil viscosity decreases as the temperature rises and that the rings expand and the opening clearance decreases.

At a low temperature (around -30 ° C.), even if the clearance is large, the oil viscosity is high and the leak is small. When the ring expands as the temperature rises, the gap should decrease and the leak should decrease, but the oil viscosity decreases
It becomes easy to leak to the vicinity. That is, up to around 0 ° C., the effect of decreasing the clearance cannot cover the decrease in oil viscosity and the leak increases. After that, the effect of decreasing the clearance between the openings becomes larger than the oil viscosity decrease, and the leak decreases,
Eventually, the clearance will be zero and the leak will be zero.

Regarding the angle cut, the leak is smaller than that of the straight cut even though the gap between the cuts is the same as that of the straight cut. This is because it is considered that the clearance affecting the leak by cutting at an angle is determined by the angle of the angle.

In the angle cut, there is a tendency that once the leak becomes zero with the temperature rise, the leak increases again. This is because the abutment portions abut each other, and after the clearance becomes zero, lateral slippage occurs at the abutment portion, and leakage occurs from the side surface of the ring.

As described above, the oil leak is easily affected by the temperature in the abutment shape of the conventional seal ring.

[0170] On the other hand, looking at the abutment special complicated shape of the thermoplastic wholly aromatic polyether ketone resin, leakage from the closed gap is sealed by g ₂ in FIG. 14, the leakage from the side sealed by g ₁ So the leak is essentially zero. However, since there is a small gap due to the dimensional tolerance, there is leakage, but very little.

[0171]

Since the seal ring of the present invention is as described above, the liquid to be sealed leaks in and out of the sealing surface on the side surface of the ring to such an extent that the sealing liquid does not impair the sealing property through the lubrication groove. A lubricating film covering the entire width of the sealing surface is formed over the entire circumference by the relative rotation with the counterpart material.

As a result, the lubricating properties over the entire sealing surface are improved, the abrasion resistance is improved, and further, there is an effect that the mating material is not worn.

By forming a step at the four corners, burrs during injection molding do not block the lubrication groove, and the sliding contact area with the counterpart material is reduced by the step. This also has the effect of reducing the rotational torque.

Furthermore, a seal ring having a stable leak amount from a low temperature to a high temperature can be provided, and by using a specific material, a seal ring having excellent sliding characteristics can be provided.

Further, since a seal ring having the above excellent sliding characteristics can be obtained, it can be used for an automatic transmission such as a transmission having a hydraulic fluid clutch.

[Brief description of the drawings]

FIG. 1A is a front view of the first embodiment. FIG. 1A is a front view of another embodiment. FIG. 1B is a partially enlarged front view of FIG. (D) (b) Cross-sectional view taken along line dd in FIG. (B) (e) (b) Cross-sectional view taken along line ee in FIG.

FIG. 2 is a cross-sectional view of the first embodiment during molding.

FIG. 3A is a partially enlarged front view of the second embodiment, and FIG.

4A is a partially enlarged front view of the third embodiment, and FIG.

5A and 5B are cross-sectional views of other examples of the seal ring.

FIG. 6A is a partially enlarged front view of Comparative Example 1; FIG.

FIG. 7A is a partially enlarged front view of Comparative Example 2; FIG.

FIG. 8A is an enlarged cross-sectional view of a conventional example in use, and FIG.

9A is a partially enlarged front view of a conventional example, and FIG.

10A is a partially enlarged front view of another conventional example, and FIG.

FIG. 11 is a front view showing an example of the oil seal ring of the present invention.

FIG. 12 is a sectional view showing a heat fixing process of the oil seal ring.

13 (a) is a front view showing another example of the oil seal ring of the present invention. FIG. 13 (b) is a partially enlarged front view of the same, and FIG. 13 (c) is a partially enlarged plan view of the same. -D line cross-sectional view (e) (b) line ee line cross-sectional view (f) (d) partly enlarged cross-sectional view

14 (a) is a partial front view showing an example of an abutment of the oil seal ring of the present invention; (b) a partially enlarged plan view of the same, and (c) a partial perspective view of the same.

FIG. 15 is a partial perspective view in which a step portion is provided in FIG. 14;

FIG. 16 (a) is a partial front view showing another example of a fitting portion of a conventional oil seal ring, and (b) is a partially enlarged plan view of the same.

FIG. 17 is a longitudinal sectional view illustrating a rotation tester.

FIG. 18 is a graph showing the relationship between the opening shape and the leak.

FIG. 19 is a graph showing the relationship between the amount of oil leakage and the endurance time in a sealing test.

FIG. 20 is a graph showing the relationship between the amount of oil leakage and the temperature in the sealing test.

[Explanation of symbols]

 Reference Signs List 20 seal ring 21 seal surface 22 lubrication groove 23 crowning 24 outer peripheral surface 25 inner peripheral surface 26 step portion 27, 27 'right-angled surface 28 inclined surface 29 mold 30 mating opening 31 mating surface 32 burr 33 peripheral groove 34 outer radial groove 35 Inner Diameter Groove 36 Concave 101 Injection Molded Product 102 Cylindrical Body 103 Ring Gauge 104 Oil Seal Ring 105 Abutment 106 Injection Position 107 Gate 110 Seal Ring 111 Seal Surface 112 Lubrication Groove 113 Chamfer 114 Outer Surface 115 Inner Surface 116 Step 117 Right angle surface 118 Inclined surface 119 Joint 121, 121 'Joint 122 Outer diameter side projection 123, 123' Chamfered part 124, 124 ', 124 "Chamfered part 125, 125' Fillet 127 External diameter side step 128 Step surface 129 Tip surface 130 Butt surface 131 ring outer diameter surface 132 outer diameter surface side step inner surface 133 outer diameter surface side protrusion inner surface 134 ring side surface 135 step difference 136 outer diameter surface side protrusion inner diameter side surface 137 ring inner diameter surface 171 shaft 172, 172 'ring groove 173, 173 '' Oil seal ring 174 Cylinder 175 Oil supply pipe 178 Measuring cylinder

Claims (6)

[Claims] 1. A mating portion comprising opposing mating portions of a seal ring having a rectangular cross section, wherein the mating portion connects four central portions of two opposing sides of the four sides of the rectangular cross section to form four rectangles. When dividing into two cross-sectional portions, a projection is provided on one of the two rectangular cross-sectional portions on the outer diameter surface side of the seal ring, and the other rectangular cross-section portion of the two rectangular cross-section portions on the outer diameter surface side A notch for receiving the projection, and the notch of the other abutment is formed at a position of the one abutment where the projection fits. 2. The method according to claim 1, wherein a gap is provided between a tip end surface of the projection and a step surface of a cutout portion facing the projection so as not to impair sealing performance. Seal ring. 3. An abutting portion comprising opposing abutments of a seal ring having a rectangular cross section, wherein the abutting surfaces comprising the two rectangular cross sections on the inner diameter side of the seal ring of the respective abutments are mutually connected. The mating surface of one of the mating portions and the mating surface of the other mating portion are parallel to each other and have a gap within a range that does not impair the sealing property when the mating mating portions are mated with each other. 3. The seal ring according to 2. 4. A notch formed on an outer diameter side of the seal ring at a mating portion formed by opposing mating portions of a seal ring having a rectangular cross section, and a front end surface of the projection and a notch opposed to the projection. The outer-diameter surface-side gap between the step surface and the inner-diameter surface side of the seal ring, and the inner-diameter surface-side gap between the abutting surface of the one abutment and the abutting surface of the other abutment are equal. 4. The seal ring according to claim 3, wherein the outer diameter side gap is longer than the inner diameter side gap. 5. The seal ring according to claim 1, wherein the length of the projection is 0.01 to 0.1 times the deployed length of the seal ring. 6. The seal ring according to claim 2, wherein the length of the gap is 0.001 to 0.01 times the deployed length of the seal ring.