JP4660871B2 - Seal ring - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seal ring for sealing an annular gap between two members provided to be rotatable relative to each other.
[0002]
[Prior art]
Conventionally, this type of seal ring is used in, for example, a hydraulic apparatus such as an automatic transmission of an automobile.
[0003]
Hereinafter, a seal ring according to a conventional technique will be described with reference to FIGS. FIG. 6 is a schematic plan view of a seal ring according to the prior art, and FIG. 7 is a schematic cross-sectional view showing a state where the seal ring according to the prior art is mounted.
[0004]
8 is a schematic view of a seal ring according to the prior art, (a) is a schematic partial plan view, (b) is a bb cross-sectional view of (a), and (c) is a c direction of (a). It is the side view seen from. FIG. 9 is a perspective view showing a state of a cutting portion (special step cut) of the seal ring according to the prior art.
[0005]
The illustrated seal ring 100 is for sealing an annular gap between a housing 200 provided with a shaft hole and a shaft 300 inserted into the shaft hole. An annular groove 301 provided in the shaft 300 is illustrated. It is used by being attached to.
[0006]
The seal ring 100 is formed of a resin material, and includes a first seal surface 101 for sealing a side wall surface of the annular groove 301 provided in the shaft 300 and an inner peripheral surface of the shaft hole provided in the housing 200. And a second sealing surface 102 for sealing.
[0007]
Then, when pressure is applied in the direction of arrow P in FIG. 7 from the sealed fluid side O toward the non-sealed fluid side A, the seal ring 1 is pressed against the non-sealed fluid side A, so the first seal surface 101 is annular. The side wall surface of the groove 301 is pressed, and the second seal surface 102 presses the inner peripheral surface of the shaft hole provided in the housing 200 facing the annular groove 301 and seals it at each position.
[0008]
In this way, leakage of the sealing fluid to the non-sealing fluid side A was prevented.
[0009]
Here, the sealing fluid is, for example, lubricating oil, and particularly refers to ATF when used in an automobile transmission.
[0010]
Further, as shown in FIG. 6, the ring main body of the seal ring 100 is provided with a cutting portion S0 at one place in the circumferential direction for the purpose of improving assemblability.
[0011]
Various forms of such a cutting part S0 are known, but as shown in FIG. 9, it can be cut into a two-stage step as being suitable for changes in ambient temperature. Special step cuts are also known.
[0012]
According to this special step cut, the surfaces perpendicular to the circumferential direction have a gap T0 with respect to the circumferential direction, and the sealed fluid side and the non-sealed fluid side are blocked. Even if the liquid expands due to heat, the amount of change in dimension can be absorbed by the gap T0 while maintaining the sealed state, so that the sealing performance can be maintained against changes in ambient temperature.
[0013]
In the seal ring 100 as described above, particularly when the shaft 300 is a soft material such as an aluminum alloy, both wear due to friction between the first seal surface 101 and the side wall surface of the annular groove 301. I was doing it.
[0014]
This is because a lubricating film made of lubricating oil is difficult to form between the first seal surface 101 and the side wall surface of the annular groove 301, and in particular, foreign matter existing in the lubricating oil is caught between them. In some cases, the wear was severe.
[0015]
As a technique for reducing such wear, a lubricating film is formed by providing a groove for supplying lubricating oil, which is a sealing fluid, between the first seal surface 101 and the side wall surface of the annular groove 301. A technique for improving the wear resistance is known (for example, JP-A-9-96363).
[0016]
That is, as shown in FIG. 8, by providing a communication groove 101a for communicating the sealed fluid side O and the non-sealed fluid side A on the first seal surface 101, lubricating oil on the sealed fluid side O is supplied to the communication groove 101a. When the first seal surface 101 is in sliding contact with the side wall surface of the annular groove 301, a lubricating film is formed between the first seal surface 101 and the lubrication state of the seal surface to improve wear resistance. It is intended to improve.
[0017]
Further, by providing the communication groove 101a, not only the lubricating film is formed, but also foreign particles existing in the lubricating oil and wear powder generated by wear are caused between the first seal surface 101 and the side wall surface of the annular groove 301. The wear resistance is further improved by providing a function of discharging to the non-sealed fluid side A so as not to bite into the fluid.
[0018]
[Problems to be solved by the invention]
However, in the case of the prior art as described above, the following problems may occur.
[0019]
In the above-described seal ring according to the related art, in order to maintain the sealing performance, it is necessary to suppress the leakage amount of the lubricating oil from the communication groove 101a to some extent. For that purpose, the groove width and the groove depth are reduced. It must be as small as possible.
[0020]
Therefore, although the wear resistance is improved by providing the communication groove 101a, it does not completely prevent wear, so that the depth of the communication groove 101a gradually decreases as wear progresses over time. In addition, the foreign matter discharge capability (contamination discharge capability) and the lubrication film formation capability decrease with time.
[0021]
Further, when the wear further progresses, the path to the communication groove 101a is blocked, and the supply of the lubricating oil to the communication groove 101a is not performed, so that there is a possibility that an abnormal wear occurs.
[0022]
This point will be described in more detail with reference to FIG. FIG. 10 is a schematic cross-sectional view showing a state in which wear has progressed due to long-term use of the seal ring according to the prior art.
[0023]
As shown in FIG. 10, the side wall surface of the annular groove 301 is worn only at the portion where the first seal surface 101 is slidably contacted. It will be pushed inward from the position of.
[0024]
Therefore, when the bottom surface of the communication groove 101a reaches the non-abraded surface of the side wall surface of the annular groove 301, the path to the communication groove 101a is blocked as shown by the arrow X in FIG. Oil will not be supplied.
[0025]
The present invention has been made to solve the above-described problems of the prior art, and an object of the present invention is to provide a seal ring with excellent quality that maintains stable sealing performance over a long period of time.
[0026]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides:
Mounted in an annular groove provided in one of the two members concentrically and relatively rotatably mounted, is slidably contacted with the side wall surface of the annular groove on the non-sealed fluid side and pressed against the other member. A seal ring for sealing an annular gap between the two members,
In the seal ring where the ring body is provided with a cutting part cut at one place in the circumferential direction,
Allow leakage of the sealing fluid from the sealing fluid side to the side wall surface of the annular groove on the non-sealing fluid side between the opposing surfaces when one cutting end and the other cutting end of the cutting portion are combined. And a flow path that
The flow path has an open end over the entire region in the depth direction of the annular groove on the sliding surface with respect to the side wall surface of the annular groove.
[0027]
Therefore, since the flow path has an open end over the entire area in the depth direction of the annular groove, a film of a sealing fluid is formed over the entire sliding contact surface with respect to the side wall surface of the annular groove, and the flow path is excellent. Since it is in a position where there is no sliding, it does not change with time, and a stable sealing fluid can be supplied.
[0028]
The one cut end is provided with a protrusion, and the other cut end is provided with a recess engaged with the protrusion,
When a chamfered portion is provided at an intersection of two adjacent outer wall surfaces of the outer wall surface of the convex portion, and a part of the flow path is formed by a gap formed between the chamfered portion and a corresponding corner of the concave portion. Good.
[0029]
Therefore, the flow path can be formed by an easy manufacturing method in which chamfering is provided.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Exemplary embodiments of the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. Absent.
[0031]
With reference to FIGS. 1-5, the seal ring which concerns on embodiment of this invention is demonstrated.
[0032]
First, with reference to FIG. 1 and FIG. 2, the whole structure etc. of the seal ring which concerns on embodiment of this invention are demonstrated.
[0033]
FIG. 1 is a schematic plan view of a seal ring according to an embodiment of the present invention, and FIG. 2 is a schematic cross-sectional view showing a state in which the seal ring according to the embodiment of the present invention is mounted.
[0034]
As shown in FIG. 2, the seal ring 1 according to the present embodiment includes an annular gap between two members concentrically and relatively rotatably assembled, that is, a housing 90 provided with a shaft hole, and this shaft. This is for sealing an annular gap between the shaft 80 inserted in the hole and used by being mounted in an annular groove 81 provided in the shaft 80.
[0035]
The seal ring 1 generally includes a first seal surface 2 for sealing a side wall surface 81a of an annular groove 81 provided in a shaft 80 as one member, and a shaft hole provided in a housing 90 as the other member. And a second seal surface 3 for sealing the inner peripheral surface 90a.
[0036]
With such a configuration, when pressure is applied in the direction of arrow P in FIG. 2 from the sealed fluid side O toward the non-sealed fluid side A, the seal ring 1 is pressed against the non-sealed fluid side A, so the first seal The surface 2 presses the side wall surface 81 a (on the non-sealed fluid side A) of the annular groove 81, and the second seal surface 3 is an inner peripheral surface of a shaft hole provided in the housing 90, Press the opposing parts and seal at each position.
[0037]
As described above, leakage of the sealing fluid to the non-sealing fluid side A is prevented.
[0038]
In addition, the sealing fluid in this Embodiment means the fluid which has lubricity, and it demonstrates as lubricating oil as the example in the following description.
[0039]
As shown in FIG. 1, the ring body of the seal ring 1 according to the present embodiment is provided with a cutting portion S in one place in the circumferential direction for the purpose of improving assemblability.
[0040]
The form of the cut portion S has a special step cut structure that is cut in two steps so that it can be suitably dealt with by changes in ambient temperature.
[0041]
Hereinafter, the cutting part S will be described in detail with reference to FIGS. FIG. 3 is a schematic perspective view showing a state of the cutting part of the seal ring according to the present embodiment, FIG. 4 is a schematic perspective view showing a state in which the cutting parts are separated from each other, and FIG. It is explanatory drawing which shows the mode of the cross section of each part. Actually, each cutting end portion in the cutting portion has a curvature as shown in FIG. 1 above, but for convenience of explanation, in each drawing, it is schematically shown without the curvature.
[0042]
In the cutting part S, one cutting end (hereinafter referred to as the first cutting end 4) and the other cutting end (hereinafter referred to as the second cutting) that engage with each other by cutting the ring body. And called end portion 5).
[0043]
The first cut end 4 is provided with a convex portion 41 and a concave portion 42 adjacent to each other, while the second cut end portion 5 has a concave portion 51 engaged with the convex portion 41, and Convex portions 52 engaged with the concave portions 42 are provided adjacent to each other.
[0044]
Here, for convenience of explanation, as shown in FIG. 4, among the wall surfaces (outer wall surfaces) forming the convex portions 41, the most distal surface is parallel to the first surface 41 a and the first seal surface 2 and is internal. The close contact surface on the side is referred to as a second surface 41b, and the close contact surface on the inner side that is concentric with the second seal surface 3 is referred to as a third surface 41c.
[0045]
Of the wall surfaces forming the recesses 42, the surface perpendicular to the circumferential direction is parallel to the fourth surface 42 a, the inner contact surface is concentric with the fifth surface 42 b, and the second seal surface 3. The close contact surface on the inner side is referred to as a sixth surface 42c.
[0046]
In addition, although the 2nd surface 41b and the 5th surface 42b are on the same surface, for convenience of explanation, it demonstrates as a separate name. A surface serving as a reference for the first cut end 4 is referred to as a reference surface 43.
[0047]
Similarly, on the second cut end portion 5 side, of the wall surfaces (outer wall surfaces) forming the convex portions 52, the most distal surface is parallel to the eleventh surface 52a and the first seal surface 2 and close to the inner side. The surface is referred to as the twelfth surface 52b, and the contact surface concentric with the inner side of the second seal surface 3 is referred to as the thirteenth surface 52c.
[0048]
Further, of the wall surfaces forming the recess 51, the surface perpendicular to the circumferential direction is parallel to the 14th surface 51 a, the inner contact surface is concentric with the 15th surface 51 b, and the second seal surface 3. The close contact surface on the inner side is referred to as a sixteenth surface 51c.
[0049]
Note that the twelfth surface 52b and the fifteenth surface 51b are on the same surface, but will be described as different names for convenience of description. The reference surface of the second cut end 5 is referred to as a reference surface 53.
[0050]
In the state where the seal ring 1 is mounted, the circumferential wall surfaces, that is, the second surface 41b and the fifteenth surface 51b, the fifth surface 42b and the twelfth surface 52b, the third surface 41c and the sixteenth surface 51c. , And the sixth surface 42c and the thirteenth surface 52c are in close contact with each other.
[0051]
On the other hand, the wall surfaces in the direction perpendicular to the circumferential direction and facing each other, that is, the fourth surface 42a and the eleventh surface 52a, the first surface 41a and the fourteenth surface 51a, and the reference surface 43 and the reference surface 53 are These are arranged to face each other so as to have gaps T1, T2, and T3, respectively.
[0052]
In this way, when the special step cut is mounted, the circumferential wall surfaces are in close contact with each other, so that leakage of the sealing fluid can be prevented.
[0053]
Further, since the wall surfaces in the direction perpendicular to the circumferential direction are provided with a gap facing each other, even if the seal ring 1 contracts due to a difference in linear expansion coefficient due to a difference in material between the seal ring 1 and the housing 90. Since the amount of change can be absorbed by the amount of the gap, the sealing performance can be suitably maintained against the surrounding temperature change.
[0054]
In general, the material of the seal ring 1 is a resin, and the material of the housing 90 is a metal. The thermal expansion amount of the seal ring 1 becomes larger at a high temperature due to the difference between the linear expansion coefficients. The gaps T1, T2, T3 are reduced.
[0055]
Further, these gaps T1, T2, T3 are set so that the gaps are not lost in principle. T1 and T2 are set to be smaller than T3 (T1 = T2 <T3). This is to ensure the gap T3 even if the gap between T1 and T2 disappears.
[0056]
And as a characteristic configuration of the embodiment of the present invention, in the mounted state, when the cutting ends S are not completely prevented from leaking at the cutting portion S, the cutting ends are combined. A flow path that allows leakage of the sealing fluid from the sealing fluid side O toward the side wall surface 81a on the non-sealing fluid side of the annular groove 81 is provided between the opposing surfaces.
[0057]
Hereinafter, the structure etc. which form this flow path are demonstrated in detail.
[0058]
As shown in FIG. 4, in the convex part 41 provided in the 1st cutting | disconnection edge part 4, the 1st surface 41a and the 2nd seal surface 3, the 1st surface 41a, the 1st seal surface 2, and 2nd which are mutually adjacent | abutted mutually A chamfered portion C1, a chamfered portion C2, a chamfered portion C3, and a chamfered portion C4 are provided at corners of intersection of the first surface 41a and the third surface 41c, and the second surface 41b and the third surface 41c, respectively.
[0059]
Similarly, in the convex part 52 provided in the 2nd cutting | disconnection edge part 5, 11th surface 52a, 2nd sealing surface 3, 11th surface 52a, 1st sealing surface 2, and 11th surface 52a which are mutually adjacent | abutted mutually. A chamfered portion C5, a chamfered portion C6, a chamfered portion C7, and a chamfered portion C8 are provided at corners of intersection of the thirteenth surface 52c, the twelfth surface 52b, and the thirteenth surface 52c, respectively.
[0060]
Thus, by providing the chamfered portion, a gap is formed between the corners of the recess corresponding to each chamfered portion, and this gap forms a flow path.
[0061]
This point will be described in more detail with reference to FIG. 5 shows the state of the cross section from the three directions in the engaging portion between the convex portion 41 and the concave portion 51, but the same applies to the engaging portion between the convex portion 52 and the concave portion 42. Description is omitted.
[0062]
Here, in FIGS. 5A, 5 </ b> B, and 5 </ b> C, the position of the cut surface is shown in the upper part, and the state of the cross section is schematically shown in the lower part.
[0063]
First, FIG. 5A shows a state of a cross section perpendicular to the circumferential direction at the engaging portion of the convex portion 41 and the concave portion 51.
[0064]
As illustrated, a gap is formed between the chamfered portion C4 and the corresponding corner of the fifteenth surface 51b and the sixteenth surface 51c, thereby forming the first flow path R1. .
[0065]
FIG. 5B shows a cross-sectional state parallel to the first seal surface 2 in the engaging portion of the convex portion 41 and the concave portion 51.
[0066]
As shown in the figure, a gap is formed between the chamfered portion C3 and the corresponding corner of the fourteenth surface 51a and the sixteenth surface 51c, thereby forming the second flow path R2. .
[0067]
Further, FIG. 5C shows a state of a cross section concentric with the second seal surface 3 in the engaging portion of the convex portion 41 and the concave portion 51.
[0068]
As shown in the figure, a gap is formed between the chamfered portion C2 and the corresponding corner of the 14th surface 51a and the side wall surface 81a (not shown in FIG. 5) of the annular groove 81. A third flow path R3 is formed.
[0069]
The first flow path R1, the second flow path R2, and the third flow path R3 are connected to each other, and a similar flow path is formed at the engaging portion between the convex portion 52 and the concave portion 42. The zeroth flow path R0 is formed by these flow paths.
[0070]
In addition, in the engaging part of the convex part 52 and the recessed part 42, although the flow path corresponding to the above-mentioned 1st flow path R1, 2nd flow path R2, 3rd flow path R3 is each provided, the reference plane 43 and Since there is a gap T3 between the reference surface 53 and the reference surface 53, as shown in FIG. 3, it flows directly into the first flow path R1 from the gap T3.
[0071]
The fourth flow path R4 is also formed by a gap T3 provided between the reference surface 43 and the reference surface 53.
[0072]
Here, the 0th flow path R0 has an open end K1 with respect to the first seal surface 2, and the fourth flow path R4 has an open end K2 with respect to the first seal surface 2.
[0073]
The region of the open end K1 in the annular groove depth direction is L1 in FIGS. 3 and 5, and the region of the open end K2 in the annular groove depth direction is L2 in FIGS. The open end of the flow path is provided over the entire region in the depth direction of the two annular grooves.
[0074]
Therefore, the open end of the flow path is provided over the entire region (L0 in FIG. 2) in the annular groove depth direction on the sliding surface of the first seal surface 2 with respect to the side wall surface 81a of the annular groove 81.
[0075]
With the above configuration, the 0th flow path R0 and the fourth flow path R4 cause the lubricating oil as the sealing fluid to leak from the sealed fluid side O. At this time, the open end of the flow path slides against the side wall surface 81a of the annular groove 81. Since it is provided over the entire region in the depth direction of the annular groove on the contact surface, a lubricating oil film is formed on the entire sliding contact surface by sliding contact between the first seal surface 2 and the side wall surface 81a.
[0076]
Accordingly, the sliding performance is improved, and foreign matters and wear powder can be discharged through these flow paths, so that the wear resistance is improved.
[0077]
In the case of the prior art, the path for causing leakage of the sealing fluid is provided at the sliding position as described above, whereas in this embodiment, the cutting without sliding is performed. Since the flow path allowing the leakage of the sealing fluid is provided in the part S, the shape of the flow path (cross-sectional shape, dimensions, etc.) does not change over time, and it is stable over a long period of time. It becomes possible to supply a sealing fluid.
[0078]
Therefore, stable sealing performance can be maintained over a long period of time, and quality is improved.
[0079]
In the present embodiment, since the second flow path R2 is formed by providing the chamfered portion C3, the seal ring 1 expands due to heat, and is temporarily the tip surface of the convex portion 41. Even when the first surface 41a abuts on the fourteenth surface 51a and the gap T2 becomes 0, the second flow path R2 is secured and the sealed fluid can be supplied stably.
[0080]
Similarly, since the third flow path R3 is formed by providing the chamfered portion C2, the seal ring 1 expands due to heat, and the first surface 41a that is the tip surface of the convex portion 41 is the fourteenth. Even when the gap T2 becomes 0 due to contact with the surface 51a, the third flow path R3 is secured.
[0081]
In addition, in the second flow path R2 and the third flow path R3, the flow rate cannot be stabilized due to the variation in the size of the gap T2, so in this embodiment, the flow rate is reduced by the first flow path R1. It is set.
[0082]
That is, the required flow rate is set according to the size of the chamfered portion C1. The chamfered portion C2 and the chamfered portion C3 are set larger than the chamfered portion C1 so as not to be affected by the flow rates of the second flow path R2 and the third flow path R3. Thereby, the flow rate is determined only by the size of the chamfered portion C1.
[0083]
Here, the size of the chamfered portion C1 is subject to restrictions such as the amount of leakage required for the size of the cutting portion S and usage conditions, but preferably in the case of chamfering the C surface as shown in the figure. It is about C0.2 to C1.
[0084]
In the example shown in the figure, the chamfered portion is shown as the C surface. However, the present invention is not limited to this, and may be an R chamfer, or chamfered at an arbitrary angle when there are dimensional restrictions. It may be formed.
[0085]
Moreover, as a material which comprises the seal ring 1, the resin composition which consists of a heat resistant resin and a filler can be applied.
[0086]
Here, examples of the heat-resistant resin include aromatic polyether ketone resins such as polycyanoaryl ether resins (PEN) and polyether ether ketone (PEEK) resins, aromatic thermoplastic polyimide resins, and polyamide 4-6 systems. Resins, polyphenylene sulfide-based resins, polytetrafluoroethylene-based resins, and the like are excellent in heat resistance, flame resistance, and chemical resistance, and exhibit excellent mechanical properties.
[0087]
In addition, a filler is mix | blended for the purpose of the improvement of the mechanical strength of material, the improvement of abrasion resistance, the provision of a low friction characteristic, etc., It does not specifically limit.
[0088]
【Example】
Hereinafter, more specific examples based on the above embodiment will be described.
[0089]
Example 1
First, as a molding material of the seal ring 1, polyether ether ketone resin (Sumitomo Chemical product Victrex PEEK 150G, heat distortion temperature 152 ° C.), glass beads used by aminosilane treatment (union glass product UB-47L, average) Each component was uniformly mixed using a Henschel mixer, and the mixture was melt-mixed at 400 ° C. using an extruder and granulated with a pelletizer. Things were used.
[0090]
And the seal ring which has the special step cut structure demonstrated in the said embodiment was obtained by injection molding using the said material.
[0091]
The height of the seal ring was 2.01 mm, the wall thickness was 1.91 mm, and the outer diameter was 47.5 mm.
[0092]
Also, the chamfered portion C4 was C0.25 chamfered, the chamfered portion C3 was C0.5 chamfered, and the chamfered portion C2 was C0.5 chamfered.
[0093]
The seal ring formed as described above and the seal ring of the present example differ only in that no chamfered portion is provided (comparative example). The amount of leakage before and after the durability test was compared.
[0094]
The durability test was performed in an environment of 120 ° C., using an oil for automatic transmission as a lubricant, a hydraulic pressure of 1.3 MPa, and a shaft rotation speed of 4000 rpm for 144 hours.
[0095]
The cylinder used as the housing was made of S45C, and the shaft was made of ADC12.
[0096]
The results obtained by the above durability test are shown in FIG. FIG. 11 is a table showing the test results of the present embodiment and the comparative example with respect to the wear amount of the seal ring side surface (first seal surface), the wear amount of the shaft groove side surface (side wall surface of the annular groove), and the leak amount during the durability test. It shows.
[0097]
As can be seen from the test results, the amount of wear in this example is smaller than that of the comparative example, and the amount of leakage is also stable.
[0098]
(Example 2)
Using the same material as in Example 1, a seal ring having the special step-cut structure described in the above embodiment was obtained by injection molding.
[0099]
The height of the seal ring was 2.01 mm, the wall thickness was 1.91 mm, and the outer diameter was 47.5 mm.
[0100]
Further, the chamfered portion C4 was C0.5 chamfered, the chamfered portion C3 was C0.7 chamfered, and the chamfered portion C2 was C0.7 chamfered.
[0101]
The seal ring formed as described above and the seal ring of the present example differ only in that no chamfered portion is provided (comparative example). The amount of leakage before and after the durability test was compared.
[0102]
In the endurance test, an endurance test was performed for 50 hours at 6000 rpm with a hydraulic pressure of 3 MPa using an oil for automatic transmission as a lubricant under an environment where the temperature was naturally raised.
[0103]
In addition, the material of the cylinder used as a housing was S45C, and the material of the shaft was S45C.
[0104]
The results obtained by the above durability test are shown in FIG. FIG. 12 is a table showing the test results of the present embodiment and the comparative example with respect to the wear amount of the seal ring side surface (first seal surface), the wear amount of the shaft groove side surface (side wall surface of the annular groove), and the leak amount during the durability test. It shows.
[0105]
As can be seen from the test results, the amount of wear in this example could be reduced even under high PV conditions such as PV = 45 MPa · m / s.
[0106]
【The invention's effect】
As described above, the present invention is excellent in wear resistance because a film of a sealing fluid can be formed over the entire sliding surface, and the flow path for leaking the sealing fluid does not change over time, so that the sealing fluid can be stably supplied. Since it can be supplied, stable sealing performance can be maintained over a long period of time, and quality is improved.
[0107]
The flow path can be formed by an easy manufacturing method in which chamfered portions are provided at corners of intersection between two adjacent outer wall surfaces.
[Brief description of the drawings]
FIG. 1 is a schematic plan view of a seal ring according to an embodiment of the present invention.
FIG. 2 is a schematic cross-sectional view showing a state in which a seal ring according to an embodiment of the present invention is mounted.
FIG. 3 is a schematic perspective view showing a state of a cut portion of the seal ring according to the embodiment of the present invention.
FIG. 4 is a schematic perspective view showing a state in which cut portions of the seal ring according to the embodiment of the present invention are pulled apart from each other.
FIG. 5 is an explanatory view showing a state of a cross section of each part in the cut part of the seal ring according to the embodiment of the present invention.
FIG. 6 is a schematic plan view of a seal ring according to the prior art.
FIG. 7 is a schematic cross-sectional view showing a state in which a seal ring according to the prior art is mounted.
FIG. 8 is a schematic view of a seal ring according to the prior art.
FIG. 9 is a perspective view showing a state of a cutting portion of a seal ring according to the prior art.
FIG. 10 is a schematic cross-sectional view showing a state in which wear has progressed due to long-term use of a seal ring according to the prior art.
11 is a table showing endurance test results for Example 1. FIG.
12 is a table showing durability test results for Example 2. FIG.
[Explanation of symbols]
1 Seal ring
2 First seal surface
3 Second seal surface
4 First cut end
41 Convex
41a first side
41b 2nd surface
41c 3rd surface
42 recess
42a 4th surface
42b 5th surface
42c 6th surface
43 Reference plane
5 Second cutting end
51 recess
51a 14th page
51b 15th surface
51c 16th surface
52 Convex
52a 11th surface
52b 12th surface
52c 13th page
53 Reference plane
80 axes
81 annular groove
81a Side wall surface
90 housing
A Unsealed fluid side
C1, C2, C3, C4, C5, C6, C7, C8 Chamfer
K1, K2 (flow path) open ends
L0 The entire area in the depth direction of the annular groove on the sliding surface
L1, L2 (open end) annular groove depth region
O Sealed fluid side
R0 0th channel
R1 first flow path
R2 Second channel
R3 3rd flow path
R4 4th channel
S cutting part
T1, T2, T3 gap

Claims (1)

A shaft mounted concentrically and relatively rotatably and mounted in an annular groove provided in the shaft of the housing, is slidably contacted with a side wall surface of the annular groove on the non-sealed fluid side, and a shaft hole of the housing A seal ring that presses against the inner peripheral surface of the shaft and seals an annular gap between the shaft and the shaft hole ,
In the seal ring where the ring body is provided with a cutting part cut at one place in the circumferential direction,
Allow leakage of the sealing fluid from the sealing fluid side to the side wall surface of the annular groove on the non-sealing fluid side between the opposing surfaces when one cutting end and the other cutting end of the cutting portion are combined. And a flow path that
Protrusions provided on the outer peripheral side of the front SL one cut end portion, and with the outer periphery of the other cut end portion is provided with recesses engaged with the convex portion, the outer wall surface of the convex portion A chamfered portion is provided at the intersection of the surface on the sealing fluid side and the inner peripheral surface of the outer wall surface of the convex portion , and the tip surface and the outer wall surface of the convex portion of the outer wall surface of the convex portion are provided. Among them, a chamfered portion is also formed at the corner of the intersection with the inner peripheral surface, and a part of the flow path is formed by a gap formed between the chamfered portion and the corresponding corner of the concave portion, respectively .
Out of the tip of the one cut end and the tip of the other cut end, the distance between the portion where the convex portion is provided and the portion where the concave portion is provided is closer to the inner peripheral side. The chamfered portion is configured such that the distance between the front end surfaces in the portion where the convex portion and the concave portion are not provided is longer and the corner of the convex portion intersects the surface on the non-sealed fluid side. By providing the flow path, the flow path has an annular groove on the slidable contact surface with respect to the side wall surface of the annular groove, even when the distal end of the one cut end and the distal end of the other cut end abut each other. A seal ring having an open end over the entire depth direction .

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