JP2008151201A - Seal ring - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal ring stably forming a film of sealed fluid on a sliding surface portion. <P>SOLUTION: This seal ring 10 is mounted to an annular groove formed in one of two members relatively rotatably assembled, is slidably arranged with respect to the side wall surface on the non-sealed fluid side of the annular groove and the peripheral surface of the other member, and seals an annular clearance between the two members. A plurality of concaves 21 is arranged over the whole slidable areas with respect to the side wall surface on the non-sealed fluid side of the annular groove. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a seal ring.

  Mounted in an annular groove provided in one of the two members assembled to be rotatable relative to each other, and slid against the side wall surface on the non-sealing fluid side of the annular groove and the peripheral surface of the other member, respectively. There is known a seal ring that is movably provided and seals an annular gap between these two members.

  Such a seal ring is applied in various apparatuses. However, in a seal ring used in a high pressure / high rotation environment, how to prevent deterioration due to wear is a problem. In particular, in recent years, in the case of a seal ring used in an automobile AT / CVT, it is necessary to adapt to higher rotations as the performance of the AT / CVT is improved.

  As a technology for suppressing the wear of the seal ring, there is known a technique that exerts a cooling effect by intentionally leaking oil as a sealing fluid on the sliding surface side and forming an oil film on the sliding surface portion. ing.

  As such a technique, what provides a groove in the sliding surface on the seal ring side is generally known (see Patent Documents 1 to 4). Thus, when a groove is provided on the sliding surface, an oil film is formed on the entire sliding surface when a groove is provided from the end on the sealed fluid side to the end on the non-sealed fluid side. However, oil leakage may increase too much. On the other hand, in the case where a groove that communicates only with the sealed fluid side of the sliding surface is provided, an oil film cannot be formed on the entire sliding surface. In particular, when the amount of eccentricity of the two members is large, the region where the oil film cannot be formed on the sliding surface with respect to the side wall surface of the annular groove may become large.

  Further, as in the technique disclosed in Patent Document 1, an oil film can be formed on the entire sliding surface by alternately providing a groove that leads only to the sealed fluid side and a groove that leads only to the non-sealed fluid side. . However, the oil film formed on the non-sealed fluid side is thinner than the oil film formed on the sealed fluid side, and it is difficult to form an oil film having a desired thickness.

In addition, as a technique for forming an oil film on the sliding surface portion, there is a technique in which unevenness is provided on the sliding surface as in the technique disclosed in Patent Document 5. However, in the case of the technique disclosed in Patent Document 5, as the sliding surface wears, the shape of the sliding surface also changes, so that the sliding state changes, such as sliding resistance. May not be stable and the quality may not be stable.
Japanese Utility Model Publication No. 06-018764 JP 09-210211 A Japanese Utility Model Laid-Open No. 04-084864 Japanese Utility Model Publication No. 06-045172 Japanese Patent Laid-Open No. 10-026229

  An object of the present invention is to provide a seal ring that can stably form a film of a sealing fluid on a sliding surface portion.

  The present invention employs the following means in order to solve the above problems.

That is, according to the seal ring of the present invention,
Mounted in an annular groove provided in one of the two members assembled so as to be rotatable relative to each other, and slides on the side wall surface of the annular groove on the non-sealed fluid side and the peripheral surface of the other member, respectively. A seal ring that is freely provided and seals the annular gap between the two members,
A plurality of depressions are provided so as to spread over the entire area where the annular groove can slide with respect to the side wall surface on the non-sealing fluid side.

Moreover, according to the seal ring of the present invention,
Mounted in an annular groove provided in one of the two members assembled so as to be rotatable relative to each other, and slides on the side wall surface of the annular groove on the non-sealed fluid side and the peripheral surface of the other member, respectively. A seal ring that is freely provided and seals the annular gap between the two members,
A plurality of depressions are provided so as to cover the entire area that can slide with respect to the side wall surface of the annular groove on the non-sealed fluid side and the entire area that can slide with respect to the peripheral surface of the other member. It is characterized by that.

  According to the present invention, the sealing fluid is respectively stored in all the recesses in the sliding region. When the two members rotate relative to each other, the sealing fluid stored in the recess flows to the sliding surface to form a film by the sealing fluid, and the sealing fluid at the sliding surface flows into the recess. Is carried out continuously in all depressions in the sliding area.

  And according to this invention, since the several hollow is provided so that the whole sliding area may be spread, the film | membrane by a sealing fluid can be uniformly formed in the whole sliding area.

  Further, according to the present invention, when not sliding, the sealing fluid can be contained in the recess, and even when sliding, the portion other than the recess is the side wall surface of the annular groove or the periphery of the other member. Since it contacts the surface, leakage of the sealing fluid to the non-sealing fluid side can be suppressed.

  In addition, according to the present invention, since the portion other than the recess basically slides, the sliding portion is in surface contact. Therefore, even if wear due to sliding proceeds, the sliding state can be stably maintained.

  Here, it is desirable that the above-mentioned “dent” has a constant shape and size regardless of its depth. By doing so, the sliding state can be kept more stable even if the wear due to sliding proceeds.

  As described above, according to the present invention, a film made of a sealing fluid can be stably formed on the sliding surface.

  The best mode for carrying out the present invention will be exemplarily 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. .

(Example 1)
With reference to FIG.1 and FIG.2, the seal ring which concerns on Example 1 of this invention is demonstrated. 1 is a partially broken perspective view of a seal ring according to Embodiment 1 of the present invention. In FIG. 1, (A
) Is a partially enlarged cross-sectional view. FIG. 2 is a schematic cross-sectional view showing a mounted state of the seal ring according to the first embodiment of the present invention. 2A shows a state where no eccentricity has occurred, and FIG. 2B shows a state where eccentricity has occurred.

<Configuration of seal ring>
The seal ring 10 according to the present embodiment seals an annular gap between the housing 70 and the shaft 80 that are assembled so as to be rotatable relative to each other, and prevents leakage of oil that is a sealing fluid on the sealing fluid side (O). Is. The seal ring 10 is mounted in an annular groove 81 provided on the shaft 80. The seal ring 10 is slidably provided on each of the side wall surface 81 a on the non-sealed fluid side (A) of the annular groove 81 and the inner peripheral surface 71 of the shaft hole of the housing 70. The seal ring 10 according to this embodiment is made of a resin material. However, the present invention is also applicable to seal rings made of other materials.

  A plurality of depressions (dimples) 21 are provided on the planar side surface 20 of the seal ring 10 according to the present embodiment so as to be evenly distributed. The plurality of recesses 21 may be provided only on the side that becomes the sliding surface of both side surfaces of the seal ring 10, but when the seal ring 10 is mounted in the annular groove 81, the seal ring 10 is directed to which side. It is desirable to provide it on both sides so that it may be attached.

  Further, it is desirable that the shape and size of the recess 21 are constant regardless of the depth. The shape of the recess 21 is not particularly limited. For example, when the planar shape is circular as shown in FIG. 1, the diameter D is as shown in FIG. It is desirable to be constant regardless of the depth. As a method for forming the recess 21, a plurality of convex portions for forming the plurality of recesses 21 may be provided in a mold for forming the seal ring 10. Further, it is desirable that the depth H of the recess 21 be deeper than the expected amount of wear so that the recess 21 exists even if wear due to sliding proceeds. For example, in the case of a seal ring for AT and CVT, since the wear amount is 100 μm or less, the depth of the recess 21 is desirably set to about 150 μm. If the depth is too deep, it leads to deterioration of processing and formability. Therefore, it is desirable to set the depth of the recess 21 to an estimated wear amount +50 μm. However, it goes without saying that the depth of the recess 21 may be appropriately set according to the use environment or the like.

  In the drawing, reference numeral 40 denotes a cut portion (abutting portion) obtained by cutting one place of the annular seal ring 10, and in this embodiment, a so-called special step cut is shown.

<Mechanism of seal ring>
When the housing 70 and the shaft 80 rotate relatively, the side surface 20 of the seal ring 10 according to the present embodiment and the side wall surface 81a of the annular groove 81 provided on the shaft 80 are slid basically. Moreover, since the part except the hollow 21 among the side surfaces 20 slides, the sliding part becomes surface contact.

  And according to the seal ring 10 which concerns on a present Example, the oil which is each sealing fluid is stored in all the hollows 21 in a sliding area | region. Even if the housing 70 and the shaft 80 remain stationary without rotating relative to each other, the oil can be stored in the recess 21 as long as the hydraulic pressure is applied.

  When the side surface 20 of the seal ring 10 and the side wall surface 81a of the annular groove 81 slide, the oil accumulated in the recess 21 flows to the sliding surface to form an oil film, and the oil film on the sliding surface portion. The operation in which a part of the oil flows into the depression 21 is continuously performed in all the depressions 21 in the sliding region.

<Excellent points of this embodiment>
According to the seal ring 10 according to the present embodiment, the side surface 20 is provided with the plurality of recesses 21 so as to be evenly distributed over the entire surface, so that an oil film can be uniformly formed over the entire sliding region.

  Here, as shown in FIG. 2A, the eccentricity is not generated between the housing 70 and the shaft 80, and the eccentricity is formed between the housing 70 and the shaft 80 as shown in FIG. The sliding area is different from the case where the phenomenon occurs. For example, when there is no eccentricity, the sliding area is in the range of L1 from the inner peripheral end of the side surface 20 of the seal ring 10 as shown in FIG. When it has occurred, as shown in FIG. 2B, the sliding region is in the range of L2 (> L1) from the inner peripheral end of the side surface 20 of the seal ring 10.

  In this way, even if the sliding area varies, in the present embodiment, since the plurality of depressions 21 are provided evenly over the side surface 20, the oil film is always applied to the entire sliding area. It can be formed uniformly. Needless to say, when there is a portion where the maximum eccentricity is clear and the side surface 20 cannot slide, the recess 21 may not be provided in such a portion.

  Further, according to the seal ring 10 according to the present embodiment, oil can be contained in the recess 21 when not sliding. Further, even during sliding, the portion other than the recess 21 in the sliding region on the side surface 20 is in contact with the side wall surface 81 a of the annular groove 81, and the outer peripheral surface 30 is also in contact with the inner peripheral surface 71 of the housing 70. It touches. Therefore, oil leakage to the non-sealed fluid side (A) can be suppressed.

  Further, as described above, in the seal ring 10 according to the present embodiment, the sliding portion is in surface contact. Therefore, even if wear due to sliding progresses, the shape of the sliding part does not change much, so the sliding area does not change much, the sliding resistance does not change much, and the sliding state is kept stable. be able to. In particular, in this embodiment, the depression 21 is kept in a constant shape and size regardless of its depth, so that the sliding state is more stable even if wear due to sliding proceeds. Can be kept.

  As described above, by providing a plurality of depressions in the entire slidable region in the seal ring (however, in this embodiment, only the side surface side), an oil film can be stably formed on the portion of the sliding surface. I understand that I can do it. In the present embodiment, the case of a seal ring having a rectangular cross section has been described as an example. However, in various seal rings, if a plurality of depressions are provided in the entire slidable region, the same effect can be obtained. Therefore, some examples will be described below.

(Example 2)
FIG. 3 shows a second embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the component same as Example 1, and the description is abbreviate | omitted. FIG. 3 is a partially broken perspective view of a seal ring according to Embodiment 2 of the present invention.

  In order to reduce sliding resistance, the seal ring 10a according to the present embodiment is provided with a notch 22a on the inner peripheral side of the side surface 20a over the entire periphery. In the case of such a type of seal ring 10a, only the region of the side surface 20a excluding the cutout portion 22a can slide, so that the plurality of depressions 21a are provided only in that region.

  Since the effect by providing the hollow 21a is the same as that of the first embodiment, the description thereof is omitted.

(Example 3)
FIG. 4 shows a third embodiment of the present invention. In addition, the same code | symbol is attached | subjected about the component same as Example 1, and the description is abbreviate | omitted. FIG. 4 is a partially broken perspective view of a seal ring according to Embodiment 3 of the present invention.

  The seal ring 10b according to the present embodiment has the same configuration as in the case of the second embodiment, but in order to reduce the sliding resistance further than in the case of the second embodiment, on the inner peripheral side of the side surface 20b. A notch 22b is provided over the entire circumference, and a portion excluding the notch 22b is formed by an inclined surface. In this way, by configuring the portion of the side surface 20b excluding the cutout portion 22b with an inclined surface, the sliding portion is in a state close to line contact, further reducing the sliding area and reducing the sliding resistance. be able to.

  Also in the case of such a type of seal ring 10b, as in the case of the second embodiment, since the region of the side surface 20b excluding the notch 22b can slide, the plurality of depressions 21b are evenly distributed in the region. It is provided as follows.

  Since the effect by providing the hollow 21b is the same as that of the first embodiment, the description thereof is omitted.

  In the embodiments so far, the case where a plurality of depressions are provided only on the side surface side of the seal ring has been described. This is because, in general, sliding wear on the side surface often becomes a problem. However, in a use environment or the like, sliding wear on the peripheral surface side may be a problem. In such a case, it is desirable to provide a plurality of depressions also on the peripheral surface side. Hereinafter, some examples in such a case will be described.

Example 4
FIG. 5 shows a fourth embodiment of the present invention. FIG. 5 is a partially broken perspective view of a seal ring according to Embodiment 4 of the present invention.

  The seal ring 10c according to the fourth embodiment is an improvement of the seal ring 10 according to the first embodiment, and the plurality of depressions are evenly distributed over the entire outer peripheral surface side with respect to the configuration of the seal ring 10. This is an example provided.

  In other words, the seal ring 10c according to the present embodiment is provided so that the plurality of depressions 21c are spread over the entire planar side surface 20c, and the plurality of depressions 31c are arranged over the entire outer circumferential surface 30c. Yes.

  In the present embodiment, the side surface described in the first embodiment is also the sliding surface on the peripheral surface side (the sliding surface between the outer peripheral surface 30c of the seal ring 10c and the inner peripheral surface 71 of the shaft hole of the housing 70). The same effect as the effect on the sliding surface on the side can be exhibited.

(Example 5)
FIG. 6 shows a fifth embodiment of the present invention. FIG. 6 is a partially broken perspective view of a seal ring according to Embodiment 5 of the present invention.

  The seal ring 10d according to the fifth embodiment is an improvement of the seal ring 10a according to the second embodiment, and the plurality of depressions are spread evenly on the outer peripheral surface side with respect to the configuration of the seal ring 10a. This is an example provided.

  That is, the seal ring 10d according to the present embodiment is provided so that the plurality of depressions 21d are spread over the entire area of the planar side surface 20d excluding the notch 22d, and the plurality of depressions 31d are also provided on the outer peripheral surface 30d. Is set up so that it can be spread throughout.

  In the present embodiment, the side surface described in the first embodiment is also the sliding surface on the peripheral surface side (the sliding surface between the outer peripheral surface 30d of the seal ring 10d and the inner peripheral surface 71 of the shaft hole of the housing 70). The same effect as the effect on the sliding surface on the side can be exhibited.

(Example 6)
FIG. 7 shows a sixth embodiment of the present invention. FIG. 7 is a partially broken perspective view of a seal ring according to Embodiment 6 of the present invention.

  The seal ring 10e according to the sixth embodiment is an improvement of the seal ring 10b according to the third embodiment, and a plurality of depressions are evenly distributed over the entire outer peripheral surface side with respect to the configuration of the seal ring 10b. This is an example provided.

  That is, the seal ring 10e according to the present embodiment is provided so that the plurality of recesses 21e are spread over the entire surface of the side surface 20e excluding the notch 22e (region formed by the inclined surface), and the outer peripheral surface 30e. In addition, the plurality of depressions 31e are provided so as to be spread over the entire area.

  In the present embodiment, the side surface described in the first embodiment is also the sliding surface on the peripheral surface side (the sliding surface between the outer peripheral surface 30e of the seal ring 10e and the inner peripheral surface 71 of the shaft hole of the housing 70). The same effect as the effect on the sliding surface on the side can be exhibited.

1 is a partially broken perspective view of a seal ring according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view showing a mounted state of the seal ring according to the first embodiment of the present invention. FIG. 3 is a partially broken perspective view of a seal ring according to Embodiment 2 of the present invention. FIG. 4 is a partially broken perspective view of a seal ring according to Embodiment 3 of the present invention. FIG. 5 is a partially broken perspective view of a seal ring according to Embodiment 4 of the present invention. FIG. 6 is a partially broken perspective view of a seal ring according to Embodiment 5 of the present invention. FIG. 7 is a partially broken perspective view of a seal ring according to Embodiment 6 of the present invention.

Explanation of symbols

10, 10a, 10b, 10c, 10d, 10e Seal ring 20, 20a, 20b, 20c, 20d, 20e Side surface 22a, 22b, 22c, 22d, 22e Notch 30, 30c, 30d, 30e Outer peripheral surface 70 Housing 71 Inner periphery Surface 80 shaft 81 annular groove 81a side wall surface

Claims (2)

Mounted in an annular groove provided in one of the two members assembled so as to be rotatable relative to each other, and slides on the side wall surface of the annular groove on the non-sealed fluid side and the peripheral surface of the other member, respectively. A seal ring that is freely provided and seals the annular gap between the two members,
A seal ring, wherein a plurality of depressions are provided so as to spread over the entire area that can slide with respect to the side wall surface of the annular groove on the non-sealing fluid side. Mounted in an annular groove provided in one of the two members assembled so as to be rotatable relative to each other, and slides on the side wall surface of the annular groove on the non-sealed fluid side and the peripheral surface of the other member, respectively. A seal ring that is freely provided and seals the annular gap between the two members,
A plurality of depressions are provided so as to cover the entire area that can slide with respect to the side wall surface of the annular groove on the non-sealed fluid side and the entire area that can slide with respect to the peripheral surface of the other member. A seal ring characterized by that.

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