JP2012117628A - Sealing device and rolling bearing - Google Patents

Abstract

To provide a sealing device in which the sealing performance is not easily lowered and a rolling bearing provided with such a sealing device.
An axial lip is provided on a sliding portion that slides on an annular portion of a slinger, and on a cylindrical portion of the core member in the radial direction of the sliding portion. And a recess 71 that opens to the annular portion 66 side of the slinger 52 in the direction. Further, the axial lip 56 is positioned on the cylindrical portion 60 side in the radial direction of the concave portion 71, and is opposite to the radial cylindrical portion 60 side of the axial lip 56 before the axial lip 56 is assembled to the slinger 52. A protruding portion 72 that protrudes to the opposite side of the annular portion 61 side of the cored bar member 50 is formed with respect to the extended surface of the annular portion on the radial direction on the tubular portion 60 side in the radial direction.
[Selection] Figure 2

Description

  The present invention relates to a sealing device, for example, a rolling bearing in which a raceway member having a raceway surface includes only a plurality of cylindrical members, a rolling bearing in which a shaft member is included in the raceway member having a raceway surface (for example, a rolling bearing for wheels), The present invention relates to a sealing device suitable for use in a water pump or a motor using a rolling bearing. Moreover, this invention relates to a rolling bearing provided with such a sealing device.

  Conventionally, as a sealing device, there is one described in Japanese Utility Model Publication No. 4-93571 (Patent Document 1).

  This sealing device is disposed between the inner race and the outer race of the hub unit. The sealing device includes a metal core member, an elastic member fixed to the metal core member, a slinger having an L-shaped cross section, and a garter spring. The slinger includes a cylindrical part and an annular part, and the elastic member includes a radial lip that always slides on the cylindrical part, a first axial lip that slides on the annular part, and a first A second axial lip that is positioned radially inward of the axial lip and that slides on the annular portion. The second axial lip has an annular groove on the outer surface in the radial direction.

  The first and second axial lips are lubricated with grease. The garter spring is fitted into the annular groove of the second axial lip. The garter spring plays a role of pressing the second axial lip inward in the radial direction.

  In the above-described configuration, in the conventional sealing device, the contact area of the axial lip with the ring portion of the slinger becomes excessively large due to the axial vibration and the pressure difference between the inside and outside of the sealing device. The moving part may be difficult to lubricate. And a seal lip may wear early and sealing performance may fall early.

  Further, in the above conventional sealing device, the grease may deteriorate due to the entry of foreign matter such as dust and mud from the outside of the hub unit, and the lubrication performance of the grease may be reduced. For this reason as well, the seal lip may be worn out early and the sealing performance may be lowered early.

Japanese Utility Model Publication No. 4-93571

  Then, the subject of this invention is providing the rolling bearing provided with the sealing device and such a sealing device in which sealing performance does not fall easily.

In order to solve the above problems, the sealing device of the present invention is:
An annular sealing member having a cylindrical part, a cored bar member having an annular part extending from the cylindrical part in a substantially radial direction of the cylindrical part, and an elastic member fixed to the cored bar member When,
An annular metal member having an annular part facing the annular part with an interval in the axial direction of the annular part and extending in a substantially radial direction,
The elastic member is
A base fixed to the annular portion of the core member;
An annular axial lip extending from the base portion to the annular portion side of the metal member in the axial direction and the cylindrical portion side in the radial direction;
The above axial lip is
A sliding portion that slides on the annular portion of the metal member;
A concave portion that is located on the cylindrical portion side in the radial direction of the sliding portion and that opens on the annular portion side of the metal member in the axial direction;
Before the axial lip is assembled to the metal member, the diameter of the axial lip on the annular surface on the opposite side of the radial cylindrical portion is positioned on the radial cylindrical side of the recess. It has the protrusion part which protrudes in the opposite side to the said annular part side from the said annular part side of the said core metal member with respect to the extended surface of the said cylindrical part side of a direction.

  According to the present invention, the axial lip has a concave portion that is located on the radial cylindrical portion side of the sliding portion and opens on the annular portion side of the axial metal member. Therefore, a lubricant such as grease that has passed through the sliding portion by centrifugal force or the like can be accommodated in the concave portion. Accordingly, since the lubricant can be positioned in the vicinity of the axial lip, the sliding portion of the axial lip can be easily lubricated, and wear of the axial lip can be suppressed.

  Further, according to the present invention, the lubricant accommodated in the recess can be gradually discharged to the outside side by the centrifugal force of the sealing member, etc., so that the flow of the lubricant from which the external foreign matter is discharged. By this, it becomes difficult to approach the sliding part side. Therefore, it is difficult for foreign matters to be mixed into the lubricant near the sliding portion, so that a reduction in the lubrication performance of the lubricant can be suppressed, and for this reason, wear of the axial lip can be suppressed.

  Further, according to the present invention, the projecting portion exists on the cylindrical portion side in the radial direction of the concave portion, and further, the projecting portion before the axial lip is assembled to the metal member, the cylindrical tube in the radial direction of the axial lip. Since it protrudes on the opposite side to the annular part of the cored bar member with respect to the extending surface on the cylindrical part side in the radial direction on the annular surface on the opposite side to the shape part side, the exit part on the outer side of the recess Can be stopped. Therefore, the retention performance of the lubricant in the recess can be improved.

In one embodiment,
The metal member has a cylindrical portion,
The annular portion of the metal member extends from the cylindrical portion of the metal member in a substantially radial direction of the cylindrical portion.

  According to the said embodiment, since the said metal member has a cylindrical part, this cylindrical part can be easily fixed to the surrounding surface of the fixing member which fixes a metal member. Therefore, the metal member can be easily fixed to the fixing member.

In one embodiment,
The protruding portion slides on the annular portion of the metal member,
The surface pressure of the sliding portion with respect to the annular portion of the metal member is larger than the surface pressure of the protruding portion with respect to the annular portion of the metal member.

  According to the embodiment, since the protruding portion slides on the annular portion of the metal member, the concave portion is formed by the sliding portion, the protruding portion, and the annular portion of the metal member. It can be a sealed space. Therefore, the retention performance of the lubricant in the recess can be improved, the lubricant can be stably and reliably supplied from the recess to the sliding portion, and seizure of the sliding portion can be suppressed.

  Moreover, according to the said embodiment, since the surface pressure of the sliding part with respect to the annular part of a metal member is larger than the surface pressure of the protrusion part with respect to the annular part of a metal member, it leaks outside from a recessed part. Lubricant can be secured. Therefore, entry of foreign matter from the outside can be suppressed.

The rolling bearing of the present invention is
An outer race member having a raceway surface;
An inner race member having a raceway surface;
A plurality of rolling elements disposed between the raceway surface of the outer raceway member and the raceway surface of the inner raceway member;
It is characterized by comprising the sealing device of the present invention for sealing between the one end portion in the axial direction of the outer race member and the one end portion in the axial direction of the inner race member.

  According to the present invention, since the life of the sealing device can be extended, the life of the rolling bearing can be extended.

  According to the sealing device of the present invention, the axial lip is positioned on the cylindrical portion side in the radial direction of the sliding portion, and has a recess that opens on the annular portion side of the metal member in the axial direction. Lubricant that has passed through the sliding portion by centrifugal force or the like can be accommodated in the concave portion, and the lubricant can be positioned in the vicinity of the axial lip. Therefore, the sliding portion of the axial lip is easily lubricated, and wear of the axial lip can be suppressed.

  Further, according to the sealing device of the present invention, the lubricant accommodated in the concave portion can be gradually discharged to the outside side by the centrifugal force of the sealing member or the like. Due to the flow of the lubricant, it becomes difficult to approach the sliding portion side. Accordingly, foreign matters are less likely to be mixed into the lubricant in the vicinity of the sliding portion, so that a reduction in grease lubrication performance can be suppressed, and wear of the seal lip can be suppressed.

  Further, according to the sealing device of the present invention, the protruding portion exists on the cylindrical portion side in the radial direction of the concave portion, and further, the protruding portion has a diameter of the axial lip before the axial lip is assembled to the metal member. Since the projecting portion protrudes to the opposite side of the annular portion side of the core metal member with respect to the extended surface on the radial cylindrical portion side of the annular surface on the opposite side to the cylindrical portion side of the direction, The external outlet can be blocked, and the retention performance of the lubricant in the recess can be improved.

It is sectional drawing of the axial direction of the rolling bearing for wheels which is one Embodiment of this invention. It is sectional drawing of the axial direction of a 2nd sealing device. It is an expansion schematic cross section of the axial direction of the front-end | tip part of an axial lip before incorporating a sealing device in a slinger. It is a schematic diagram for demonstrating one mechanism by which the sliding part of an axial lip is lubricated.

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

  FIG. 1 is a sectional view in the axial direction of a wheel rolling bearing according to an embodiment of the present invention.

  The wheel rolling bearing includes an outer ring 2 as an outer race member, an inner shaft 3 and an inner ring 4 as inner race members, a plurality of first balls 5, a plurality of second balls 6, and a first sealing. A device 8 and a second sealing device 9 are provided. The said 1st ball | bowl 5 and the 2nd ball | bowl 6 comprise a rolling element.

  The inner shaft 3 has a disc-shaped brake disk mounting flange 10 extending in the radial direction for mounting the brake disk 11 at one end in the axial direction. A plurality of bolt through holes are formed on a concentric circle centered on the approximate center of the brake disk mounting flange 10. With the brake disk 11 in contact with the brake disk mounting flange 10 and with the wheel member 13 in contact with the brake disk 11, an end surface of the wheel member 13 opposite to the brake disk 11 side; The brake disk mounting flange 10 is fixed with a plurality of bolts 15.

  An inner ring 4 is externally fitted and fixed to the other axial end portion of the inner shaft 3. An angular type raceway groove 16 as a raceway surface is formed between the inner ring 4 and the brake disc mounting flange 10 in the inner shaft 3. An angular type raceway groove 17 as a raceway surface is formed on the outer peripheral surface of the inner ring 4.

  The outer ring 2 is disposed on the other end side of the brake disc mounting flange 10 in the inner shaft 3 so as to face the inner shaft 3 in the radial direction. The outer ring 2 has a vehicle body side mounting flange 14 extending in the radial direction on the other end side in the axial direction. A plurality of bolt through holes for inserting bolts for attaching the vehicle body side mounting flange 14 to the vehicle body side (knuckle) are formed in the disk-shaped vehicle body side mounting flange 14. The outer ring 2 has an angular first raceway groove 26 as a first raceway surface and an angular second raceway groove 27 as a second raceway surface, which are spaced apart in the axial direction on the inner peripheral surface of the outer ring 2. is doing. The first track groove 26 is located on the one end side with respect to the second track groove 27.

  The plurality of first balls 5 are spaced by a predetermined interval in the circumferential direction while being held by the cage 18 between the raceway groove 16 of the inner shaft 3 and the first raceway groove 26 of the outer ring 2. Are arranged. The plurality of second balls 6 are spaced by a predetermined interval in the circumferential direction while being held by the cage 19 between the raceway groove 17 of the inner ring 4 and the second raceway groove 27 of the outer ring 2. Has been placed.

  The first sealing device 8 is disposed in the vicinity of the opening on the one end side (the brake disc mounting flange 10 side) in the axial direction between the inner shaft 3 and the outer ring 2. The first sealing device 8 seals the opening on the one end side between the inner shaft 3 and the outer ring 2.

  On the other hand, the second sealing device 9 is disposed between the inner ring 4 and the outer ring 2 in the vicinity of the opening on the other end side (the vehicle body mounting flange 14 side) in the axial direction. The second sealing device 9 seals the opening on the other end side between the inner ring 4 and the outer ring 2.

  FIG. 2 is a sectional view of the second sealing device 9 in the axial direction.

  As shown in FIG. 2, the first sealing device (hereinafter simply referred to as a sealing device) 9 includes a sealing member 48 and a slinger 52, and the sealing member 48 includes a cored bar member 50 and an elastic member 51. .

  The core member 50 is an annular member and has a substantially L-shaped cross section. The cored bar member 50 includes a cylindrical part 60 and an annular part 61. The cylindrical part 60 is fitted and fixed to the inner peripheral surface of the outer ring 2 (see FIG. 1). Further, the annular portion 61 extends inward in the substantially radial direction from one end side in the axial direction on the inner peripheral surface of the cylindrical portion 60 (left side in the drawing of FIG. 2).

  The slinger 52 is an annular member and has a substantially L-shaped cross section. The slinger 52 has a cylindrical portion 65 and an annular portion 66, and an inner peripheral surface 68 of the cylindrical portion 65 is externally fitted and fixed to the outer peripheral surface of the inner ring 4 (see FIG. 1). Yes. On the other hand, the annular portion 66 of the slinger 52 extends from the end on the outer side in the axial direction of the outer peripheral surface of the cylindrical portion 65 (the right side in the drawing) to the outer side in the substantially radial direction. The annular portion 66 of the slinger 52 is located on the other side in the axial direction from the annular portion 61 of the core metal member 50. Most of the annular portion 66 of the slinger 52 excluding a part on the inner side in the radial direction is opposed to the annular portion 61 of the cored bar member 50 in the axial direction through a gap.

  Specifically, the elastic member 51 is made of a rubber material. As the rubber material, nitrile rubber, hydrogenated nitrile rubber, acrylic rubber, silicon rubber, or fluorine rubber is preferably used. The elastic member 51 is an annular member and includes a base 53, a first radial lip 54, a second radial lip 55, and an axial lip 56.

  The base portion 53, the inner peripheral surface of the cylindrical portion 60 of the core member 50, the end surface on the other axial side of the annular portion 61 connected to the inner peripheral surface, and the radially inner side of the annular portion 61 It is fixed to the cored bar member 50 so as to cover the side end.

  The first radial lip 54 extends from the base 53 to the radially inner side and the other axial side, and slides on the cylindrical portion 65 of the slinger 52, while the second radial lip 55 is The base portion 53 extends inward in the radial direction and one side in the axial direction, and slides on the cylindrical portion 65 of the slinger 52. Further, the axial lip 56 extends from the base 53 to the cylindrical portion 60 side of the radial cored bar member 50 and to the other side in the axial direction, and on one axial side of the annular portion 66 of the slinger 52. It slides on the end face.

  As shown in FIG. 2, the axial lip 56 has an annular sliding portion 70, an annular recess 71, and an annular protrusion 72. The sliding portion 70 is configured to define a sealed space with respect to the outside by sliding on the annular portion 66 of the slinger 52. The recess 71 is located on the cylindrical portion 60 side of the core member 50 in the radial direction of the sliding portion 70. The recess 71 is open on the annular portion 66 side of the axial cored bar member 50. The protrusion 72 is located on the cylindrical portion 60 side of the core metal member 50 in the radial direction of the recess 71. The protrusion 72 slides on the annular portion 66 of the cored bar member 50. The surface pressure of the sliding portion 70 with respect to the annular portion 66 of the slinger 52 is larger than the surface pressure of the protruding portion 72 with respect to the annular portion 66 of the slinger 52.

  The radial distance between the end of the projecting portion 72 on the cylindrical portion 60 side of the core metal member 50 in the radial direction and the end of the slinger 52 on the cylindrical portion 60 side of the core metal member 50 in the radial direction is 0. The length is 3 mm or more. In addition, the interference with respect to the annular part 66 of the slinger 52 in the protrusion 72 is preferably 50 μm or less because the protrusion 72 is less likely to be worn, and more preferably greater than 0 and 30 μm or less.

  In the chamber formed by the first radial lip 54, the second radial lip 55, and the slinger 52, and the chamber formed by the first radial lip 54, the axial lip 56, and the slinger 52, an appropriate amount of grease is used as a lubricant. Encapsulated or applied. The sliding portion between the first radial lip 54 and the slinger 52, the sliding portion between the second radial lip 55 and the slinger 52, and the sliding portion between the axial lip 56 and the slinger 52 are lubricated by the grease. ing.

  FIG. 3 is an enlarged schematic cross-sectional view in the axial direction of the distal end portion of the axial lip 56 before the sealing member 48 is incorporated into the slinger 52.

  As shown in FIG. 3, the protrusion 72 has a radial cored bar on the annular surface 85 opposite to the radial tubular portion 60 side of the axial lip 56 before the axial lip 56 is assembled to the slinger 52. It protrudes from the annular part 61 (refer FIG. 2) side of the metal core member 50 to the opposite side to the annular part 61 side with respect to the extended surface 80 on the cylindrical part 60 (refer to FIG. 2) side of the member 50. .

  In the above configuration, in the sealing device 9, for example, the sliding portion 70 of the axial lip 56 is lubricated by the following mechanism.

  That is, when the slinger 52 fixed to the inner ring 4 is rotated by the rotation of the inner ring 4, centrifugal force acts on the grease on the slinger 52. Then, as shown in FIG. 4, the grease a existing on the sealing chamber side of the sliding portion 70 moves outward in the radial direction, which is the direction indicated by the arrow A, from the radially inner side of the sliding portion 70. It passes through the sliding portion 70 on the outer side in the radial direction of the sliding portion 70. Then, the grease b that has passed through the sliding portion 70 is accommodated in the recess 71.

  Here, when the grease passes through the sliding portion 70, the sliding portion 70 is lubricated. Further, the grease accommodated in the recess 71 leaks from the recess 71 and lubricates the sliding portion 70 when the vibration in the axial direction acts on the sealing device 9. The grease accommodated in the recess 71 is gradually discharged from the recess 71 through the protrusion 72 by the centrifugal force. Due to the outward movement of the grease, it is possible to prevent external foreign matters from passing through the protruding portion 72 toward the sealed chamber. Therefore, it is suppressed that an external foreign material reaches | attains the sliding part 70 vicinity, and an external foreign material moves into a sealed chamber. Therefore, the grease existing in the vicinity of the sliding portion 70 is suppressed from being deteriorated by foreign matters, and a decrease in the lubricating performance of the sliding portion 70 is suppressed.

  According to the sealing device 9 of the above embodiment, the axial lip 56 is located on the cylindrical portion 60 side of the core member 50 in the radial direction of the sliding portion 70, and the annular portion 66 of the slinger 52 in the axial direction. Since the recess 71 is open to the side, the grease that has passed through the sliding portion 70 by centrifugal force or the like can be accommodated in the recess 71. Therefore, since the grease can be positioned in the vicinity of the axial lip 56, the sliding portion 70 of the axial lip 56 is easily lubricated, and wear of the axial lip 56 can be suppressed.

  Further, according to the sealing device 9 of the above embodiment, the grease accommodated in the recess 71 can be gradually discharged to the outside by the centrifugal force of the sealing member 48, etc. It becomes difficult to approach the sliding part 70 side by the flow of grease. Therefore, it is difficult for external foreign matters to be mixed into the grease in the vicinity of the sliding portion 70, so that a decrease in the lubrication performance of the grease can be suppressed, and the wear of the axial lip 56 can also be suppressed for this reason.

  Further, according to the sealing device 9 of the above embodiment, the protruding portion 72 exists on the cylindrical portion 60 side of the core metal member 50 in the radial direction of the recessed portion 71, and the protruding portion 72 further has the axial lip 56. Before assembling to the slinger 52, the axial lip 56 has a core with respect to the radially extending surface 80 on the tubular portion 60 side of the annular surface 85 opposite to the tubular portion 60 side of the core member 50 in the radial direction. Since it protrudes on the opposite side to the annular portion 61 side of the gold member 50, the protruding portion 72 can block the outlet on the outside of the recess 71, and the retention performance of the grease in the recess 71 can be improved. .

  Further, according to the sealing device 9 of the above-described embodiment, the metal member is the slinger 52 and has the cylindrical portion 65. Therefore, the cylindrical portion 65 can be easily fixed to the outer peripheral surface of the inner ring 4 as a fixing member. The slinger 52 can be easily fixed to the inner ring 4.

  Further, according to the sealing device 9 of the above embodiment, the protruding portion 72 slides on the annular portion 66 of the slinger 52, so the sliding portion 70, the protruding portion 72, and the annular portion 66 of the slinger 52. Thus, the recess 71 can be used as a sealed space. Therefore, the grease retention performance of the recess 71 can be improved, the grease can be stably supplied from the recess 71 to the sliding portion 70, and seizure of the sliding portion 70 can be suppressed.

  Further, according to the sealing device 9 of the above embodiment, the surface pressure of the sliding portion 70 with respect to the annular portion 66 of the slinger 52 is larger than the surface pressure of the protruding portion 72 with respect to the annular portion 66 of the slinger 52. Therefore, it is possible to secure grease that leaks out from the recess 71 to the outside. Therefore, the grease can be flowed to the outside, so that the entry of foreign matter from the outside can be suppressed.

  In the sealing device 9 of the above embodiment, there are two radial lips 54, 55 and one axial lip 56. However, in the present invention, it is sufficient that the radial lip has an integer number of zero or more. One or more axial lips may be present.

  Moreover, in the sealing device 9 of the said embodiment, although the labyrinth seal did not exist, in this invention, a labyrinth seal may exist.

  In the sealing device 9 of the above embodiment, there is no garter spring that urges the radial lip inward in the radial direction. However, in the present invention, the garter spring that urges the radial lip inward in the radial direction. May exist.

  In the sealing device 9 of the above embodiment, one recess 71 and one protrusion 72 are present in the axial lip. However, in the present invention, two or more recesses may be present in one axial lip. There may be two or more protrusions on the axial lip.

  In the sealing device 9 of the above embodiment, there is one axial lip 56, and the axial lip has the recess 71 and the protrusion 72. However, in the present invention, the axial lip is M (M Is a natural number of 2 or more), and only N (N is a natural number satisfying M ≧ N) of them may have a recess and a protrusion. In addition, it is preferable that the projecting portion has followability, and it is preferable that the thickness in the radial direction is thinner than the sliding portion.

  Further, in the sealing device 9 of the above embodiment, the metal member is the slinger 52 having the cylindrical portion 65, but in this invention, the metal member is an annular member having no cylindrical portion, The structure which pushes the edge part of the radial direction of a metal member in the annular groove of a track member may be sufficient.

  Further, as described above, it is preferable that the tightening allowance of the slinger 52 with respect to the annular portion 66 in the protruding portion 72 is 50 μm or less because the protruding portion 72 is less likely to be worn, and more preferably greater than 0 and 30 μm or less. However, in this invention, the interference with respect to the annular part of the metal member in the protruding part may be larger than 50 μm. In addition, it is more preferable that the interference of the projecting portion is 1/10 or less in comparison with the interference of the sliding portion.

  Further, in the sealing device 9 of the above-described embodiment, the end of the protruding core 72 on the cylindrical portion 60 side of the radial core metal member 50 and the cylindrical portion 60 side of the radial core metal member 50 of the slinger 52 are arranged. Although the distance from the end is 0.3 mm or longer, in the present invention, the end of the projecting portion on the cylindrical portion side of the core metal member in the radial direction and the core member in the annular portion of the metal member The distance from the end of the cylindrical portion may be shorter than 0.3 mm.

  Moreover, in the sealing device 9 of the said embodiment, although the recessed part 71 had the annular structure, in this invention, the recessed part does not need to be an annular structure. The at least one axial lip may have a plurality of recesses at the same radial position, and the plurality of recesses may be positioned at intervals in the circumferential direction of the sealing device. In addition, it is more preferable that the concave portion has an annular structure, since the followability of the protruding portion becomes better than when the concave portion has a non-annular structure.

  Further, in the sealing device 9 of the above embodiment, the protruding portion 72 is in sliding contact with the annular portion 66 of the slinger 52. However, in this invention, the protruding portion is slightly spaced from the annular portion of the metal member. And may be configured to face each other in the axial direction.

  In the sealing device 9 of the above embodiment, the lubricant is grease. However, in this invention, the lubricant may be, for example, lubricating oil, and is a substance having fluidity and lubricity. Any substance can be used.

  Moreover, in the rolling bearing for wheels of the said embodiment, although the sealing device 9 of this invention was arrange | positioned in the vicinity of the opening of the other end side of the axial direction of the ball arrangement | positioning chamber which is a sealing chamber, the sealing device of this invention May be arranged on both sides in the axial direction of the rolling element arrangement chamber (lubricant enclosure chamber) of the rolling bearing for the wheel or only on one end side in the axial direction.

  Moreover, in the said embodiment, although the rolling bearing was a rolling bearing for wheels which has the inner shaft 3, the rolling bearing of this invention is a structure which a member which has a raceway surface consists only of multiple (2 or more) cylindrical members. It may be. Also. The rolling bearing of the present invention may be a water pump, a motor, or the like, and may be any rolling bearing having a rolling element and a raceway surface (in this specification, a rolling bearing is referred to as a rolling element). , Defined as a device having a raceway surface on which this rolling element rolls). Further, in the rolling bearing of the present invention, the rolling elements may not be balls but may be rollers, or may be both balls. The rolling element is a roller, including a case where the rolling element is a tapered roller, a case where it is a cylindrical roller, and a case where it is a convex roller, but when the rolling element is a roller, the rolling element is a tapered roller. And preferred. In the rolling bearing according to the present invention, the outer race member may be a single member or a plurality of members, and the inner race member may be a single member or a plurality of members. Also good. In the rolling bearing of the present invention, the rolling elements may be arranged in a single row, or the rolling elements may be arranged in two or more rows.

2 outer ring 3 inner shaft 4 inner ring 5 first ball 6 second ball 9 second sealing device 16 inner shaft raceway groove 17 inner raceway raceway groove 26 outer ring first raceway groove 27 outer raceway second raceway groove 48 sealing member DESCRIPTION OF SYMBOLS 50 Metal core member 51 Elastic member 52 Slinger 53 Base part of elastic member 56 Axial lip of elastic member 60 Cylindrical part of core metal member 61 Circular part of core metal member 65 Cylindrical part of slinger 66 Axial part of slinger 70 Axial Sliding part of lip 71 Recessed part of axial lip 72 Protruding part of axial lip 80 Before assembling the axial lip to the slinger, the radial direction on the annular surface opposite to the cylindrical part side of the cored bar member in the radial direction of the axial lip 85 The extension surface of the cylindrical part side 85 The annular surface on the opposite side to the cylindrical part side of the axial metal core member of the axial lip

Claims (4)

An annular sealing member having a cylindrical part, a cored bar member having an annular part extending from the cylindrical part in a substantially radial direction of the cylindrical part, and an elastic member fixed to the cored bar member When,
An annular metal member having an annular part facing the annular part with an interval in the axial direction of the annular part and extending in a substantially radial direction,
The elastic member is
A base fixed to the annular portion of the core member;
An annular axial lip extending from the base portion to the annular portion side of the metal member in the axial direction and the cylindrical portion side in the radial direction;
The above axial lip is
A sliding portion that slides on the annular portion of the metal member;
A concave portion that is located on the cylindrical portion side in the radial direction of the sliding portion and that opens on the annular portion side of the metal member in the axial direction;
Before the axial lip is assembled to the metal member, the diameter of the axial lip on the annular surface on the opposite side of the radial cylindrical portion is positioned on the radial cylindrical side of the recess. A projecting portion projecting from the annular portion side of the core member to the opposite side of the annular portion side with respect to the extending surface of the cylindrical portion side in the direction apparatus. The sealing device according to claim 1,
The metal member has a cylindrical portion,
The sealing device according to claim 1, wherein the annular portion of the metal member extends from the cylindrical portion of the metal member in a substantially radial direction of the cylindrical portion. The sealing device according to claim 1 or 2,
The protruding portion slides on the annular portion of the metal member,
The sealing device according to claim 1, wherein a surface pressure of the sliding portion with respect to the annular portion of the metal member is larger than a surface pressure of the protruding portion with respect to the annular portion of the metal member. An outer race member having a raceway surface;
An inner race member having a raceway surface;
A plurality of rolling elements disposed between the raceway surface of the outer raceway member and the raceway surface of the inner raceway member;
4. The sealing device according to claim 1, wherein a seal is provided between an end portion on one side in the axial direction of the outer raceway member and an end portion on one side in the axial direction of the inner raceway member. A rolling bearing characterized by that.

Images