JP6421471B2 - Sealing device - Google Patents

Description

  The present invention relates to a sealing device, and more particularly, to a sealing device used to prevent foreign matters such as dust and muddy water from entering a shaft end portion or the like.

  Conventionally, a sealing device provided with a slinger has been used for a hub bearing used for a rotating shaft of a vehicle or the like, a wheel shaft, or the like. FIG. 4 is a sectional view showing a schematic structure of this type of conventional sealing device. As shown in FIG. 4, the sealing device 100 is provided between a bearing outer ring 101 and a bearing inner ring 102 that is rotatable relative to the bearing outer ring 101 inserted through the shaft hole of the bearing outer ring 101. Prevent foreign matter such as dust and muddy water from entering inside. The sealing device 100 includes an outer peripheral side sealing member 103 fitted inside the bearing outer ring 101 and an inner peripheral side sealing member 104 which is a slinger member fitted outside the bearing inner ring 102 and attached so as not to be relatively movable. The inner peripheral side sealing member 104 is a metal annular member having an L-shaped cross section, and is fitted to the outer peripheral surface of the bearing inner ring 102. The outer peripheral side sealing member 103 includes a metal annular member 105 fitted to the bearing outer ring 101, and a seal member 106 that is an elastic body attached to the inside of the annular member 105. The seal member 106 includes seal lips 106 a, 106 b, and 106 c, and the seal lips 106 a to 106 c are in contact with the inner side surface of the inner peripheral side sealing member 104 at their tips, and between the bearing outer ring 101 and the bearing inner ring 102. The space is sealed. Further, an annular gap is formed between the outer peripheral side end portion 103 a of the outer peripheral side sealing member 103 and the outer peripheral side end portion 104 a of the inner peripheral side sealing member 104, and a labyrinth seal portion 107 is formed. (For example, refer to Patent Documents 1 and 2).

  The conventional sealing device has the structure as described above, and prevents the entry of foreign matter, muddy water, etc. into the inside by the action of the seal lips 106a, 106b, 106c, and the action of the labyrinth seal portion 107. This prevents intrusion of muddy water into the interior.

JP 2006-342826 A Japanese Patent Laid-Open No. 2005-83537

  However, in such a conventional sealing device 100, in order to improve the sealing performance of the labyrinth seal portion 107, it is necessary to reduce the gap between the labyrinth seal portion 107. Considering this, there is a limit to narrowing the gap of the labyrinth seal portion 107. For this reason, there is a limit to the sealing performance of the labyrinth seal portion 107.

  In the conventional sealing device 100, the seal lips 106a, 106b, 106c are in contact with the inner surface of the inner peripheral side sealing member 104, and the inner peripheral surface of the inner peripheral side sealing member 104 and the outer peripheral surface of the bearing inner ring 102. There was a problem of water intrusion from between.

  Thus, the conventional sealing device 100 does not necessarily have high sealing performance.

  This invention is made | formed in view of the said subject, and it aims at providing the sealing device which can improve sealing performance.

  In order to achieve the above object, a sealing device according to the present invention is a first sealing member attached to an outer peripheral member that is one of two members that can rotate relative to each other about an axis, and the other of the two members. A sealing device comprising: a second sealing member attached to an inner peripheral side member accommodated in the outer peripheral side member so as to face the first sealing member at the axis, wherein the first sealing member is An annular seal member centered on the axis formed from an elastic body is provided, the second sealing member is an annular metal member centered on the axis, and the seal member extends in the axial direction. And at least one annular first seal lip that contacts the second sealing member, and an annular protrusion extending in the axial direction, and the second sealing member is an annular extension extending in the axial direction. With ridges The projecting portion of the second sealing member forms an annular gap between the projecting portion and the projecting portion of the seal member, and the projecting portion includes a projecting portion projecting from the gap. It is characterized by that.

  In the sealing device according to one aspect of the present invention, the convex portion is provided in an annular shape around the axis in the protrusion.

  In the sealing device according to an aspect of the present invention, the seal member includes an annular second seal lip centered on the axis at an inner peripheral end in a direction perpendicular to the axis, and the second seal lip Includes a lip tip portion that is convex toward the axis, and the lip tip portion contacts the outer peripheral surface of the inner peripheral member.

  In the sealing device according to one aspect of the present invention, the protrusion is provided on the outer peripheral side end of the seal member in a direction perpendicular to the axis.

  The sealing apparatus which concerns on 1 aspect of this invention WHEREIN: The said protrusion is provided in the outer peripheral side end in the direction perpendicular | vertical to the said axis line in the said 2nd sealing member.

  In the sealing device according to an aspect of the present invention, the protruding portion includes an annular recess that is concave in the axial direction, the recess accommodates the protruding portion, and the annular portion is interposed between the protruding portion and the protruding portion. Create a gap.

  In the sealing device according to an aspect of the present invention, the protrusion is provided on the outer peripheral side of the protrusion in a direction perpendicular to the axis.

  In the sealing device according to one aspect of the present invention, the first sealing member includes an annular metal mounting member centering on the axis, and the mounting member is formed to be fitted to the outer peripheral side member. ing.

  In the sealing device according to one aspect of the present invention, the attachment member is formed integrally with the seal member.

  According to the sealing device according to the present invention, the annular protrusion extending in the axial direction of the sealing member formed of an elastic body and the annular protrusion extending in the axial direction of the second sealing member made of metal are: An annular gap is formed adjacent to each other, and a labyrinth structure is formed between the protrusion and the protrusion. In this gap, a convex portion is provided on the protruding portion, and the width of the gap is further narrowed in the convex portion. For this reason, the sealing performance by a labyrinth structure can be improved, and the sealing performance of a sealing device can be improved. Moreover, since the protrusion is an elastic body, the protrusion and the protrusion are not damaged even if they contact the protrusion. For this reason, the width of the gap between the protrusion and the protrusion can be narrowed without considering damage due to the collision between the protrusion and the protrusion, and the sealing performance by the labyrinth structure can be further improved. The sealing performance of the sealing device can be further improved.

  According to the sealing device of the present invention, since the convex portion is provided in an annular shape around the axis line in the projection portion, the width of the gap can be reduced over the entire circumferential direction of the gap, and the labyrinth structure is used. The sealing performance can be further improved, and the sealing performance of the sealing device can be further improved.

  According to the sealing device according to the present invention, the lip tip portion convex toward the axis line included in the second seal lip of the seal member abuts on the outer peripheral surface of the inner peripheral side member. The space between the members can be sealed on the outer peripheral surface of the inner peripheral member by a seal lip. For this reason, even if the penetration leak of the liquid from the attachment part of an inner peripheral side member and a 2nd sealing member arises, the penetration | invasion to the inside of a liquid can be prevented with a 2nd seal lip. it can. Thereby, the sealing performance of a sealing device can be improved more.

  According to the sealing device of the present invention, since the protrusion is provided on the outer peripheral side end in the direction perpendicular to the axis in the seal member, the labyrinth structure can be formed on the outer peripheral side of the sealing device, And the like can be effectively prevented.

  According to the sealing device of the present invention, the protrusion is provided at the outer peripheral side end in the direction perpendicular to the axis in the second sealing member, so that the labyrinth structure is formed on the outer peripheral side of the sealing device. It is possible to effectively prevent the intrusion of muddy water and the like.

  According to the sealing device of the present invention, since the protrusion is accommodated in the recess provided in the protrusion, and an annular gap is formed, along the inner surface of the recess, that is, from the outer peripheral surface of the protrusion to the inner peripheral surface. A gap can be formed across. For this reason, the sealing performance by a labyrinth structure can be improved more.

  According to the sealing device of the present invention, since the protrusion is provided on the outer peripheral side of the protrusion in the direction perpendicular to the axis, the space inside the protrusion can be increased in the sealing device. . For this reason, the first seal lip can be lengthened, and the first seal lip can be separated from the second sealing member even when the inner peripheral member and the outer peripheral member are eccentric during rotation. Therefore, the followability of the first seal lip against eccentricity can be improved.

  According to the sealing device according to the present invention, the first sealing member has the metal mounting member fitted to the outer peripheral side member and can be attached to the outer peripheral side member. The member can be firmly attached to the outer peripheral side member.

  According to the sealing device according to the present invention, since the attachment member is formed integrally with the seal member, the seal member can be firmly held.

It is sectional drawing which shows the structure of the sealing device which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the sealing device which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the modification of the sealing device which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows schematic structure of the conventional sealing device.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view showing a configuration of a sealing device according to a first embodiment of the present invention.

  The sealing device 1 according to the first embodiment of the present invention is used for a hub bearing used for a rotating shaft of a vehicle or the like, a wheel shaft, or the like. However, this embodiment shows only a specific example of the present invention, and the object to which the present invention is applied is not limited to this. For example, the present invention can be applied to a pair of configurations that rotate relative to each other in various vehicles such as automobiles, home appliances, and industrial machines.

  As shown in FIG. 1, the sealing device 1 includes a bearing outer ring 40 as an outer peripheral side member and a bearing inner ring 50 as an inner peripheral side member, which are two members that can rotate relative to each other about the axis x of the hub bearing. It is fitted and attached. More specifically, the sealing device 1 includes an annular first sealing member 10 and an annular second sealing member 20, and the first sealing member 10 is in close contact with the inner peripheral surface 41 of the bearing outer ring 40. The second sealing member 20 is fitted in close contact with the outer peripheral surface 51 of the bearing inner ring 50.

  As shown in FIG. 1, the first sealing member 10 includes an annular seal member 11 centered on the axis line x and an annular mounting member 12 centered on the axis line x. The seal member 11 is formed of an elastic body, and various rubber materials are used as the elastic body, for example. Examples of the rubber material used include synthetic rubbers such as nitrile rubber (NBR), hydrogenated nitrile rubber (H-NBR), acrylic rubber (ACM), and fluorine rubber (FKM). The attachment member 12 is made of metal, for example, stainless steel or SPCC (cold rolled steel).

  As shown in FIG. 1, the seal member 11 of the first seal member 10 includes a seal portion base 13 having a L-shaped cross section (hereinafter also simply referred to as a cross section) passing through the axis x, and a seal portion base 13. A seal lip holding portion 14 having a rectangular cross section which is a portion on the inner peripheral side, a protrusion 15 extending in the direction of the axis x from the end on the outer peripheral side in the direction perpendicular to the axis x of the seal portion base 13, and the seal lip holding portion 14 A side seal lip portion 16 as a first seal lip extending outward in the direction of the axis x from an outer surface 14a which is an outer surface of the inner surface 14b, and an inner peripheral surface 14b which is a surface on the inner peripheral side of the seal lip holding portion 14. And a radial seal lip portion 17 as a second seal lip extending inward in the direction perpendicular to the axis x. In the seal member 11, the portions 13 to 17 are formed as an integral member. In the direction of the axis x, the sealing target direction (the direction of arrow a in FIG. 1) is the inside, and the opposite direction (the direction of arrow b in FIG. 1) is the outside. Further, in the direction perpendicular to the axis x, the direction away from the axis x (the direction of arrow c in FIG. 1) is the outer peripheral side, and the direction approaching the axis x (the direction of arrow d in FIG. 1) is the inner peripheral side.

  The protrusion 15 has a cylindrical shape centered on the axis x. On the outer peripheral surface 15a that is the side surface on the outer peripheral side of the protruding portion 15, a convex portion 18 that protrudes in the outer peripheral direction is provided. That is, the convex portion 18 is an annular ridge portion that is provided on the outer peripheral surface 15a of the projection portion 15 in the circumferential direction over the entire axis line x.

  Similarly, the side seal lip portion 16 has a cylindrical shape with the axis line x as the center, and a predetermined region from the tip of the side seal lip portion 16 abuts on the inner peripheral surface of the second sealing member 20 as will be described later. The protrusion 15 may extend parallel to the axis x, or may extend at an angle with respect to the axis x. Further, the side seal lip portion 16 may extend in parallel with the axis x, or may extend at an angle with respect to the axis x.

  The radial seal lip portion 17 includes an annular lip tip portion 17a centering on the axis line x and having a wedge shape whose cross section is convex in the inner circumferential direction. The tip end portion 17a of the lip is in liquid-tight contact with the outer peripheral surface 51 of the bearing inner ring 50 at its inner peripheral side front end portion, and the bearing outer ring 40 and the bearing inner ring 50 are sealed at this contact portion. Further, the radial seal lip portion 17 includes an annular recess 17b on the outer peripheral surface facing the lip tip portion 17a. The recess 17b accommodates an annular spring 31 provided in the sealing device 1 to accommodate the lip tip. The portion 17a is urged in the inner circumferential direction.

  The attachment member 12 is a thin plate-like annular member centered on the axis line x, and includes a base portion 12a, a protrusion holding portion 12b, and a seal lip attachment portion 12c. Each part 12a-12c is formed integrally.

  As shown in FIG. 1, the base portion 12 a is an annular portion centered on an axis x having an L-shaped cross section, and is formed corresponding to the inner peripheral surface 41 and the outer surface 42 of the bearing outer ring 40. That is, in the first sealing member 10, the inner surface 12 d that is the inner surface of the base portion 12 a of the mounting member 12 and the outer peripheral surface 12 e that is the outer surface are respectively formed on the outer surface 42 and the inner peripheral surface 41 of the bearing outer ring 40. The bearing outer ring 40 is fitted in close contact. A seal base 13 is attached to the outer surface and inner peripheral surface of the base 12a.

  The protruding portion holding portion 12b is a cylindrical portion extending in the axis x direction from the outer peripheral side end portion of the base portion 12a, extends inside the protruding portion 15 of the seal member 11, and holds the protruding portion 15 of the seal member 11. To do. The shape of the protruding portion holding portion 12 b corresponds to the shape of the protruding portion 15. The outer end portion 12f, which is the outer end portion of the protruding portion holding portion 12b, does not reach the outer end portion 15b, which is the outer end portion of the protruding portion 15, and the outer end portion 12f is between the outer end portion 15b. Have a predetermined interval. Due to this interval, as will be described later, even when the second sealing member 20 collides with the protruding portion 15, the protruding portion 15 does not contact the second sealing member 20 in the portion where the protruding portion holding portion 12 b of the protruding portion 15 does not exist. It is possible to avoid the deformation of the protrusion holding portion 12b and the protrusion 23 described later. As a result, the protrusion 15, the first sealing member 10, and the second sealing member 20 are deformed (tilted, etc.). ) Or damage can be avoided.

  The seal lip mounting portion 12c is a disk-shaped portion extending from the inner end portion of the base portion 12a in a direction perpendicular to the axis x, and a seal lip holding portion 14 is mounted on the outer surface thereof.

  The seal member 11 may be integrally formed with the mounting member 12 by, for example, vulcanization molding or the like, or may be formed as separate bodies and then bonded to each other.

  The second sealing member 20 is a so-called slinger, which is a metal member, for example, a stainless steel member, and is a thin plate-like annular member centered on the axis x. As shown in FIG. 1, the second sealing member 20 includes an attachment portion 21, a seal lip contact portion 22, and a ridge portion 23.

  The attachment portion 21 is a cylindrical portion centered on the axis x, and is formed corresponding to the outer peripheral surface 51 of the bearing inner ring 50. In other words, the second sealing member 20 has the inner peripheral surface 21 a that is the inner peripheral surface of the mounting portion 21 closely fitted to the outer peripheral surface 51 of the bearing inner ring 50 and is fitted to the bearing inner ring 50. Yes.

  The seal lip contact portion 22 is a disc-shaped portion centering on the axis line x and extending in the outer peripheral direction from the inner end portion of the attachment portion 21. The front end of the side seal lip portion 16 of the seal member 11 is in liquid tight contact with the inner surface 22a, which is the inner surface of the seal lip contact portion 22, with a tightening margin.

  The ridge portion 23 is an annular portion centering on the axis line x that extends outward from the outer peripheral side end portion of the seal lip contact portion 22 in the axis line x direction. As shown in FIG. 1, the ridge portion 23 is formed with an annular recess 24 centering on the axis line x and extending outward in the axis line x direction. That is, in the ridge portion 23, a cylindrical inner peripheral side wall portion 23a centering on the axis line x is opposed to the inner peripheral side wall portion 23a on the outer peripheral side, and similarly a cylindrical outer peripheral surface centering on the axis line x. A side wall portion 23b and a disk-like bottom portion 23c centering on the axis line x are formed to connect the outer end portion of the inner peripheral side wall portion 23a and the outer end portion of the outer peripheral side wall portion 23b.

  As shown in FIG. 1, the protrusion 15 of the seal member 11 is accommodated in the recess 24 of the protrusion 23, and the surface of the recess 24 is interposed between the protrusion 15 and the protrusion 23. A circular gap 25 having a U-shaped cross section is formed along the line. As described above, the inside 2 of the sealing device 1 is communicated with the outside through the passage formed by the narrow gap 25. That is, in the sealing device 1, a labyrinth structure (labyrinth seal portion) by the gap 25 is formed in the opening portion with respect to the outside.

  In addition, an annular convex portion 18 is provided on the outer peripheral surface 15 a of the protrusion 15, and the gap 25 is narrower at the portion facing the convex portion 18 than at the other portions.

  As described above, in the sealing device 1 according to the first embodiment of the present invention, the inside 2 of the sealing device 1 communicates with the outside through the narrow gap 25 having a U-shaped cross section. A labyrinth structure is formed in the opening of the sealing device 1. For this reason, generation | occurrence | production of the infiltration from the outside, such as muddy water, can be avoided.

  Further, the narrow gap 25 extends in a U-shape over the outer peripheral side and inner peripheral side surfaces of the protrusion 24. For this reason, the gap can be formed longer than in the prior art. For this reason, compared with the past, it is possible to more reliably avoid the occurrence of intrusion from the outside such as muddy water.

  Further, the narrow gap 25 is formed by accommodating the protrusion 15 in the recess 24 of the protrusion 23 of the second sealing member 20. For this reason, it is possible to easily form a narrow gap 25 that is longer than the conventional one.

  Further, since the gap 25 is narrower at the portion facing the convex portion 18 than the other portions, the sealing performance by the labyrinth structure can be further enhanced, and the infiltration of muddy water or the like from the outside can be further improved. Occurrence can be avoided more reliably.

  Further, since the protrusion 15 is formed of an elastic agent such as a rubber member, the bearing outer ring 40 or the bearing inner ring 50 is eccentric when rotating, and the protrusion 15 is formed on the inner peripheral side wall 23a or the outer peripheral side wall part of the protrusion 23. Even if it collides with 23b and the bottom part 23c, the projection part 15 can absorb the impact. In particular, the protrusion 15 can absorb the impact more by coming into contact with the protrusion 23 at the convex portion 18. For this reason, the first sealing member 10 and the second sealing member 20 are not damaged by this collision. Therefore, unlike the prior art, the narrowing of the width of the gap 25 is not limited in order to avoid a collision, and in the sealing device 1, the width of the gap 25 can be narrowed compared to the conventional one. For this reason, the sealing performance of the gap | interval 25 with respect to permeation of muddy water etc. from the outside can be improved compared with the past.

  Further, in the sealing device 1, the radial seal lip portion 17 has a lip tip portion 17 a disposed inside the second sealing member 20 in liquid-tight contact with the outer peripheral surface 51 of the bearing inner ring 50. The space between the outer ring 40 and the bearing inner ring 50 is sealed. For this reason, even if a permeation leak occurs between the mounting portion 21 of the second sealing member 10 and the bearing inner ring 50, the radial seal lip portion 17 prevents the permeation leaked liquid from entering the inside. It can be avoided. For this reason, the sealing performance of the sealing device 1 can be further improved.

  As described above, according to the sealing device 1 according to the first embodiment of the present invention, the protrusions 15 and the protrusions 23 are not considered without considering damage due to the collision between the protrusions 15 and the protrusions 23. The width of the gap 25 can be reduced, the sealing performance by the labyrinth structure can be improved, and the sealing performance of the sealing device 1 can be improved.

  Moreover, since the width | variety 25 is further narrowed in the part which faces the convex part 18 rather than another part, the sealing performance by a labyrinth structure can be improved more, and the sealing performance of the sealing device 1 is improved. It can be improved further.

  Further, according to the sealing device 1 according to the present embodiment, the radial seal lip portion 17 is provided even when a permeation leak occurs between the mounting portion 21a of the second sealing member 1 and the bearing inner ring 50. This penetration of the leaked liquid can be avoided. Thereby, the sealing performance of the sealing device 1 can be further improved.

  In the first embodiment of the present invention, the convex portion 18 is provided on the outer peripheral surface 15a of the protruding portion 15. However, the convex portion 18 may be provided on the inner peripheral surface of the protruding portion 15. Further, it may be provided on the outer peripheral surface 15a and the inner peripheral surface of the protrusion. Further, the shape of the convex portion 18 is not limited to the configuration in which the entire outer circumferential surface 15 a of the projecting portion 15 extends annularly in the circumferential direction, and the gap 25 is narrowed in a part of the circumferential surface of the projecting portion 15. Such a shape may be used. For example, a plurality of convex portions having a predetermined length in the circumferential direction on the outer peripheral surface 15a and / or the inner peripheral surface and having a cross-sectional shape similar to the convex portion 18 may be provided at intervals.

  Next, a second embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 2 is a cross-sectional view showing a configuration of a sealing device 60 according to the second embodiment of the present invention. The sealing device 60 according to the present embodiment differs from the sealing device 1 according to the first embodiment only in the shapes of the side seal lip of the seal member 11 and the second seal member. Hereinafter, the same components are denoted by the same reference numerals, description thereof is omitted, and only different configurations will be described.

  Similar to the second sealing member 20, the second sealing member 70 is a so-called slinger, which is a member made of metal, for example, stainless steel, and is a thin plate-like annular member centered on the axis x. As shown in FIG. 2, the second sealing member 70 includes an attachment portion 71, a seal lip contact portion 72, a protrusion 73, and a connection portion 74.

  Similar to the attachment portion 21, the attachment portion 71 is a cylindrical portion centered on the axis x, and is formed corresponding to the outer peripheral surface 51 of the bearing inner ring 50. The seal lip abutting portion 72 is a disk-shaped portion centering on the axis x, and an inner side surface 72a that is an inner surface of the seal lip abutting portion 72 has a side seal of the seal member 11 as described later. The tip of the lip portion 80 is in liquid tight contact with a tightening margin.

  The seal lip contact portion 72 is connected to the attachment portion 71 via a connection portion 74. For example, as shown in FIG. 2, the connecting portion 74 is an annular member centered on the axis x, and extends in the outer peripheral direction perpendicular to the axis x from the inner end of the mounting portion 71, and then on the outer peripheral side and the outer side. It has a shape that extends obliquely and is connected to the inner peripheral end of the seal lip contact portion 72.

  The ridge 73 is a cylindrical portion centering on the axis x that extends inward in the axis x direction from the outer peripheral side end of the seal lip contact portion 72. Unlike the protrusion 23 in the first embodiment, the protrusion 73 does not have a recess. The ridge 73 has an inner circumferential surface 73 a that is a side surface on the inner circumferential side thereof adjacent to the outer circumferential surface 15 a of the projection 15, and an annular gap 75 is formed between the ridge 73 and the projection 15. ing. Further, the gap 75 is narrower at the convex portion 18 than at the other portions, like the gap 25 in the first embodiment of the present invention.

  As described above, in the sealing device 60, the protrusion 73 only forms the gap 75 between the protrusion 15 and the outer peripheral surface 15 a. Therefore, the space in the inside 2 of the sealing device 60, that is, the space on the inner peripheral side with respect to the protrusion 15 can be expanded.

  The seal portion 11 includes a side lip seal portion 80 that extends in the direction of the axis line x, as in the first embodiment. As described above, since the space in the interior 2 of the sealing device 60 is expanded, the side lip seal portion 80 is longer than the side lip seal portion 16 of the first embodiment.

  As described above, according to the sealing device 60 according to the second embodiment of the present invention, the gap 75 can be narrowed similarly to the sealing device 1 according to the first embodiment, and the labyrinth structure The sealing performance by can be improved, and the sealing performance of the sealing device 1 can be improved.

  In addition, the side lip seal portion 80 can be lengthened, and even if the bearing outer ring 40 and the bearing inner ring 50 are decentered during rotation, the side lip seal portion 80 is used for the seal lip contact of the second sealing member 70. The separation from the contact portion 72 can be prevented. Thus, the followability of the side lip seal portion 80 against the eccentricity when the bearing outer ring 40 and the bearing inner ring 50 are rotated can be improved.

  Next, a modification of the sealing device according to the second embodiment of the present invention will be described. FIG. 3 is a cross-sectional view showing a modification of the sealing device according to the second embodiment of the present invention. This modification differs from the sealing device 60 according to the second embodiment of the present invention only in the configuration of the first sealing member 10. Hereinafter, the same components are denoted by the same reference numerals, description thereof is omitted, and only different configurations will be described.

  As shown in FIG. 3, the sealing device 80 according to the present modification includes an annular first sealing member 81 centering on the axis x. As shown in FIG. 3, the first sealing member 81 includes an annular seal member 82 centered on the axis x and a thin plate-shaped annular mounting member 83 centered on the axis x. The seal member 82 is formed of an elastic body. As the elastic body, for example, various rubber members are used in the same manner as the seal portion 11 in the first embodiment of the present invention described above. The attachment member 83 is made of metal, and is made of, for example, stainless steel, similarly to the attachment member 12 in the first embodiment of the present invention described above.

  As shown in FIG. 3, the sealing member 82 of the first sealing member 81 is different from the sealing member 11 in each of the above embodiments in the cross-sectional shape passing through the axis x. Specifically, the seal member 82 is different in the shape of the seal lip holding portion from the shape of the seal lip holding portion 14 in each of the above-described embodiments. This will be specifically described below.

  As shown in FIG. 3, the seal member 82 has an L-shaped seal portion base 84, a seal lip holding portion 85 that is a portion on the inner peripheral side of the seal portion base 84, and an axis x of the seal portion base 84. A protrusion 86 extending outward in the axis x direction from the outer peripheral end in the vertical direction, a side seal lip 87 serving as a first seal lip extending outward in the axis x direction from the seal lip holding portion 85, and a seal A radial seal lip portion 88 extending from the lip holding portion 85 to the inner peripheral side in a direction perpendicular to the axis line x is provided. In the seal member 82, the portions 84 to 88 are formed as an integral member.

  The seal lip holding portion 85 is an annular portion centered on the axis x, and includes a first portion 85a, a second portion 85b, and a third portion 85c. As shown in FIG. 3, the first portion 85 a has a substantially U-shaped cross section that is convex outward. The second portion 85 b is a disc-shaped portion centering on the axis line x that connects the outer peripheral side end portion of the first portion 85 a and the inner end portion of the seal portion base portion 84. The third portion 85c is a disc-shaped portion centering on the axis line x and extending in the inner circumferential direction from the inner circumferential side end portion of the first portion 85a. The radial seal lip portion 88 extends from the inner peripheral end of the third portion 85c. As shown in FIG. 3, a side seal lip portion 87 extends from the outer surface protruding to the outside of the first portion 85a.

  The protrusion 86 has a cylindrical shape centered on the axis x. On the outer peripheral surface 86a, which is the side surface on the outer peripheral side of the protruding portion 86, there is a convex portion 90 that is convex in the annular outer peripheral direction centering on the axis line x, like the protruding portion 15 in the first embodiment of the present invention. Projected. The convex part 90 has the same shape as the convex part 18.

  Similarly, the side seal lip portion 87 has a cylindrical shape with the axis line x as the center, and a predetermined range from the tip thereof is the inner surface of the second sealing member 70 (the inner surface of the seal lip contact portion 72). 72a) in liquid-tight contact. The protrusion 86 may extend parallel to the axis x, or may extend at an angle with respect to the axis x. Further, the side seal lip portion 87 may extend in parallel to the axis line x, or may extend at an angle with respect to the axis line x.

  The radial seal lip portion 88 includes an annular lip tip portion 88a centering on the axis line x and having a wedge shape whose cross section is convex in the inner circumferential direction. The lip tip portion 88a is in liquid-tight contact with the outer peripheral surface 51 of the bearing inner ring 50 at the inner peripheral side tip portion, and the bearing outer ring 40 and the bearing inner ring 50 are sealed at this contact portion. The radial seal lip portion 88 includes an annular recess 88b on the outer peripheral surface facing the lip tip portion 88a, and an annular spring 89 provided in the sealing device 80 is accommodated in the recess 88b, and the lip tip portion 88a. Is energized in the inner circumferential direction.

  The attachment member 83 is a thin plate-like annular member centered on the axis x, and includes a base portion 83a, a protrusion holding portion 83b, and a seal lip attachment portion 83c. Each part 83a-83c is integrally formed.

  As shown in FIG. 3, the base 83 a is an annular portion centered on an axis x having an L-shaped cross section, and is formed corresponding to the inner peripheral surface 41 and the outer surface 42 of the bearing outer ring 40. That is, in the first sealing member 81, like the first sealing member 10, the inner surface 83 d and the outer peripheral surface 83 e of the base portion 83 a of the mounting member 83 are respectively connected to the outer surface 42 and the inner peripheral surface 41 of the bearing outer ring 40. The bearing outer ring 40 is fitted in close contact. Further, a seal base 84 is attached to the outer surface and inner peripheral surface of the base 83a.

  The protruding portion holding portion 83 b is a cylindrical portion that extends outward in the axis x direction from the outer peripheral side end portion of the base portion 83 a, extends inside the protruding portion 86 of the sealing member 82, and protrudes 86 of the sealing member 82. Hold. The shape of the protrusion holding portion 83 b corresponds to the shape of the protrusion 86. The outer end 83f, which is the outer end of the projection holding portion 83b, does not reach the outer end 86b of the projection 86 as in the case of the projection holding portion 12b in each of the above embodiments. 83f has a predetermined space | interval between the outer side edge parts 86b.

  The seal lip mounting portion 83c has a cross-sectional shape corresponding to the seal lip holding portion 85 of the seal member 82, and is an annular portion of a thin plate centering on the axis line x. Is attached.

  The seal member 82 may be integrally formed with the attachment member 83 by, for example, vulcanization molding or the like, or may be formed as separate bodies and then bonded to each other.

  Also in the sealing device 80 according to this modification, as in the second embodiment, the protruding portion 73 has an inner peripheral surface 73a that is a side surface on the inner peripheral side thereof and a side surface on the outer peripheral side of the protruding portion 86. An annular gap 91 is formed between the protrusion 73 and the protrusion 86 adjacent to a certain outer peripheral surface 86a.

  Like the gap 75 in the second embodiment, the gap 91 is narrower at the convex portion 90 than at the other portions.

  In this modified example having the above-described configuration, the seal member 82 and the attachment member 83 have a convex shape outwardly at the seal lip holding portion 85 and the seal lip attachment portion 83c (the first portion 85a). ). For this reason, as in the second embodiment of the present invention, the side seal lip portion 87 can be lengthened, and the seal member 82 can reduce the weight of the seal lip holding portion 85.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments of the present invention, and includes all aspects included in the concept and claims of the present invention. In addition, the configurations may be appropriately combined as appropriate so as to achieve at least part of the problems and effects described above. For example, the shape, material, arrangement, and the like of each component in each of the above embodiments can be appropriately changed depending on the specific usage mode of the present invention. Specifically, the shapes of the seal base portions 13 and 84 and the seal lip holding portions 14 and 85 of the seal members 11 and 82, the shapes of the base portions 12a and 83a of the attachment members 12 and 83, and the seal lip attachment portions 12c and 83c are as follows. The shape is not limited to the above-described shape, and may be appropriately changed according to the shape of the outer peripheral side member (bearing outer ring 40) and the like.

1,60,80,100 sealing device
2 Internal 10, 81 First sealing member 11, 82, 106 Seal member 12, 83 Mounting member 12a, 83a Base portion 12b, 83b Protrusion holding portion 12c, 83c Seal lip mounting portion 12d, 83d Inner side surface 12e, 83e Outer peripheral surface 12f, 83f Outer end portion 13, 84 Seal portion base portion 14, 85 Seal lip holding portion 14a Outer side surface 14b Inner peripheral surface 15, 86 Protruding portion 15a, 86a Outer peripheral surface 15b, 86b Outer end portion 16, 80, 87 Side seal lip Portions 17, 88 Radial seal lip portions 17a, 88a Lip tip portions 17b, 88b Recess portions 18, 90 Protrusion portions 20, 70 Second sealing members 21, 71 Mounting portions 21a Inner peripheral surfaces 22, 72 Seal lip contact portions 22a, 72a Inner side surfaces 23, 73 Protruding portion 23a Inner peripheral side wall 23b Outer peripheral side wall 23c Bottom 24 Recess 25 75, 91 Gap 31, 89 Spring 40, 101 Bearing outer ring 41 Inner peripheral surface 42 Outer side surface 50, 102 Bearing inner ring 51 Outer peripheral surface 73a Inner peripheral surface 74 Connection portion 85a First portion 85b Second portion 85c Third portion 103 outer peripheral side sealing member 104 inner peripheral side sealing member 105 annular member 106a, 106b, 106c seal lip 107 labyrinth seal part x axis

Claims (8)

A first sealing member that is attached to an outer peripheral member that is one of two members that can rotate relative to each other about the axis; and an inner peripheral member that is the other of the two members and is accommodated in the outer member. And a second sealing member attached to face the first sealing member at
The first sealing member includes an annular sealing member centered on the axis formed of an elastic body,
The second sealing member is an annular metal member centered on the axis,
The seal member includes at least one annular first seal lip that extends in the axial direction and contacts the second sealing member, and an annular protrusion that extends in the axial direction,
The second sealing member includes an annular ridge extending in the axial direction,
The protruding portion of the second sealing member forms an annular gap between the protruding portion adjacent to the protruding portion of the sealing member,
The protrusion includes a protrusion protruding from the gap ,
The protruding portion of the second sealing member has a cylindrical inner peripheral side wall centered on the axis, and a cylindrical shape centered on the axis facing the inner peripheral side wall on the outer peripheral side. An outer peripheral side wall part, a bottom part connecting the end part of the inner peripheral side wall part and the end part of the outer peripheral side wall part are formed, and an annular concave part that is concave in the axial direction is formed,
The sealing device according to claim 1, wherein the protrusion is accommodated in the recess and the gap is formed between the protrusion and the recess .   The sealing device according to claim 1, wherein the protrusion is provided in an annular shape around the axis in the protrusion. The seal member includes an annular second seal lip centered on the axis at an inner peripheral end in a direction perpendicular to the axis, and the second seal lip has a lip tip convex toward the axis. 3. The sealing device according to claim 1, wherein the lip tip portion is in contact with an outer peripheral surface of the inner peripheral side member. 4. The sealing device according to claim 1, wherein the projecting portion is provided on an outer peripheral side end of the seal member in a direction perpendicular to the axis. 5. 5. The sealing device according to claim 1, wherein the protrusion is provided at an outer peripheral side end in a direction perpendicular to the axis in the second sealing member. The protrusions may, in a direction perpendicular to the axis, any one Kouki mounting of the sealing device according to claim 1 to 5, characterized in that provided on the outer peripheral side of the protrusion. The said 1st sealing member is equipped with the cyclic | annular metal attachment member centering on the said axis line, This attachment member is formed so that a fitting to the said outer peripheral side member is possible. 7. The sealing device according to any one of items 6 . The sealing device according to claim 7, wherein the attachment member is formed integrally with the seal member.

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