JP6286873B2 - Rolling bearing with sealing device - Google Patents

Description

  The present invention relates to an improvement of a rolling bearing with a sealing device of a rotating outer ring type that is used to rotatably support a pulley that spans an endless belt driven by an automobile engine, for example, with respect to a support shaft.

  Among various pulleys that span endless belts such as timing belts and accessory drive belts used in automotive engines, tension pulleys for adjusting the tension of this endless belt and the travel position of this endless belt The idler pulley for adjustment is rotatably supported by a rolling bearing with respect to a stationary member such as a support shaft. Such a rolling bearing is often installed at a position where rainwater or muddy water splashed from the road surface is easily applied when the automobile is running. For this reason, in order to prevent such inconveniences that foreign matters such as rainwater and muddy water enter the bearing inner space of the rolling bearing and reduce the bearing life, the bearing inner space has been conventionally used as a rolling bearing. It is common practice to use a device with a sealing device that closes the end opening of the device.

  4-5 has shown what was described in patent document 1 as an example of the conventional structure of such a rolling bearing with a sealing device. This rolling bearing with a sealing device includes an inner ring 102 having double-row inner ring raceway surfaces 101, 101 at the axially intermediate portion of the outer peripheral surface, and double-row outer ring raceway surfaces 103, 103 at the axially intermediate portion of the inner peripheral surface. The outer ring 104 having the same is disposed concentrically with each other. Then, between the double row inner ring raceway surfaces 101, 101 and the double row outer ring raceway surfaces 103, 103, a plurality of balls 105, 105, which are rolling elements for each row, are held by the cages 106, 106. It is provided so that it can roll while being held. Further, both ends in the axial direction of the bearing internal space 107, which exist between the outer peripheral surface of the inner ring 102 and the inner peripheral surface of the outer ring 104 and in which the balls 105, 105 are installed, are formed by a pair of sealing devices 108, 108. It is blocking. In use, the inner ring 101 does not rotate in a state of being fitted and fixed to the support shaft 109 which is a stationary member. On the other hand, the outer ring 103 rotates together with the pulley 110 in a state where a pulley 110 such as an idler pulley or a tension pulley, which is a rotating member, is externally fitted and fixed.

  Each of the pair of sealing devices 108 and 108 is formed by combining a slinger 111 and a seal ring 112, and has a configuration as shown in detail in FIG. Of these, the slinger 111 is entirely made of a metal plate in an annular shape. Such a slinger 111 has a small diameter existing at both ends in the axial direction of the outer peripheral surface of the inner ring 102 with cylindrical portions provided at the inner peripheral edge in a state where the axial end opening of the bearing internal space 107 is closed. It is fixed to the outer part with an interference fit. The seal ring 112 is formed by reinforcing an elastic material 114 made of an elastomer such as rubber with a cored bar 113 formed in a ring shape with a metal plate. Such a seal ring 112 is a state in which a part of the elastic material 114 constituting the outer peripheral edge portion is formed at both axial ends of the inner peripheral surface of the outer ring 104 in the state of being arranged on the inner side in the axial direction of the slinger 111. The groove 117 is locked. Further, in this state, the front end edge of the main seal lip 115 (part of the front end edge of the bifurcated in the illustrated example) provided on the inner peripheral edge of the seal ring 112 is used as the outer peripheral surface of the inner ring 102. The ring-shaped main seal sliding contact surface 118 existing near the both ends in the axial direction is in sliding contact with the entire circumference. At the same time, a part of the elastic material 114 provided in a state of extending outward in the axial direction from a radial intermediate portion located radially outside of the main seal lip 115 in the outer surface of the seal ring 112 is configured. The tip end edge of the auxiliary seal lip 116 is in sliding contact with the ring-shaped auxiliary seal sliding contact surface 119 existing near the outer peripheral portion of the inner surface of the slinger 111. The auxiliary seal lip 116 is inclined in the direction in which the diameter dimension increases toward the distal end side.

  In the case of the conventional structure configured as described above, the pair of sealing devices 108 and 108 prevent leakage of the lubricating grease sealed in the bearing internal space 107 and allows the external space to enter the bearing internal space 107. Prevents intrusion of foreign substances such as rainwater and muddy water. In particular, in the case of the pair of sealing devices 108, 108, the slinger 111 is arranged on the outer side in the axial direction of the seal ring 112, and the auxiliary seal lip 116 is attached to the auxiliary seal sliding contact surface 119 existing on the inner surface of the slinger 111. The tip edge is in sliding contact. For this reason, compared with the sealing device which consists only of the seal ring provided only with the main seal lip, the effect of preventing entry of foreign matter can be enhanced. That is, in the case of the pair of sealing devices 108, 108, due to the presence of the auxiliary seal lip 116, foreign matter may enter the seal internal space 120 surrounded by the slinger 111, the seal ring 112, and the inner ring 102 from the external space. Can be suppressed. For this reason, it becomes difficult for this foreign matter to reach the sliding contact portion between the leading edge of the main seal lip 115 and the main seal sliding contact surface 118, and the effect of preventing foreign matter from entering can be increased accordingly.

JP 2010-25252 A

  However, in recent years, since the severity of the water environment has increased, high waterproof performance is required, and further improvement in the sealing performance of the bearing is required. For example, although the sealing performance can be improved by the pair of sealing devices 108 and 108 described in Patent Document 1 described above, since the seal ring 112 and the slinger 111 have only one contact, the seal lip Once the foreign matter has entered, the foreign matter may easily enter the bearing.

  The present invention has been made in view of the above-described problems, and provides a rolling bearing with a sealing device capable of maintaining good sealing performance.

The above object of the present invention can be achieved by the following constitution.
(1) an outer ring that is a rotating raceway;
An inner ring which is a fixed race,
Between the outer ring and the inner ring, a plurality of rolling elements that are held movably by a cage,
A pair of sealing devices that are arranged on both axial sides of the rolling element and seal an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring;
A rolling bearing with a sealing device comprising:
The sealing device is disposed between the first sealing member and the rolling element in the axial direction, and a substantially annular first sealing member fixed to both axial ends of the inner peripheral surface of the outer ring. And a substantially annular second sealing member fixed to the outer peripheral surface of the inner ring,
The first sealing member is formed by covering a first metal core with a first elastic member,
The first elastic member, you forming the second sealing member and the sliding contact or labyrinth has a first seal portion,
The outer surface in the axial direction of the first metal core is all covered with the first elastic member,
An exposed surface in which the first metal core is exposed in an annular shape is formed on the inner surface in the axial direction of the first metal core,
The second sealing member is formed on a metal second metal core and a radially outer portion of the second metal core, and is in sliding contact with the exposed surface of the first metal core or forms a labyrinth. a second sealing portion formed of a member, Ri Tona,
A pair of stepped portions having a smaller diameter than the outer peripheral surface of the inner ring are provided at both axial ends of the outer peripheral surface of the inner ring,
The second cored bar of the second sealing member has a cylindrical portion that is press-fitted and fixed to the stepped portion and extends in the axial direction, and an annular portion that extends radially outward from the axially inner end of the cylindrical portion. And
The second seal portion includes a fourth lip portion extending outward in the axial direction and radially outward, and a fifth lip portion extending outward in the axial direction and radially inward.
The fourth lip portion and the fifth lip portion are in sliding contact with the exposed surface of the first metal core or form a labyrinth,
A first lip portion extending inward in the axial direction, a neck portion extending inward in the radial direction, and a radially inner end portion of the neck portion extend inward in the axial direction and outward in the axial direction at the inner peripheral edge of the first elastic member. The first seal part comprising a second lip part and a third lip part is formed,
The first lip portion forms a labyrinth with the annular portion of the second cored bar,
The second lip portion is in sliding contact with the annular portion of the second core metal or forms a labyrinth,
The rolling bearing with a sealing device, wherein the third lip portion is in sliding contact with the cylindrical portion of the second core bar or forms a labyrinth .
(2) an outer ring that is a rotating raceway;
An inner ring which is a fixed race,
Between the outer ring and the inner ring, a plurality of rolling elements that are held movably by a cage,
A pair of sealing devices that are arranged on both axial sides of the rolling element and seal an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring;
A rolling bearing with a sealing device comprising:
The sealing device is disposed between the first sealing member and the rolling element in the axial direction, and a substantially annular first sealing member fixed to both axial ends of the inner peripheral surface of the outer ring. And a substantially annular second sealing member fixed to the outer peripheral surface of the inner ring,
The first sealing member is formed by covering a first metal core with a first elastic member,
The first elastic member, you forming the second sealing member and the sliding contact or labyrinth has a first seal portion,
The outer surface in the axial direction of the first metal core is all covered with the first elastic member,
An exposed surface in which the first metal core is exposed in an annular shape is formed on the inner surface in the axial direction of the first metal core,
The second sealing member is formed on a metal second metal core and a radially outer portion of the second metal core, and is in sliding contact with the exposed surface of the first metal core or forms a labyrinth. a second sealing portion formed of a member, Ri Tona,
A pair of stepped portions having a smaller diameter than the outer peripheral surface of the inner ring are provided at both axial ends of the outer peripheral surface of the inner ring,
A caulking groove is recessed in the axially inner portion of the pair of stepped portions,
The second core metal of the second sealing member is a cylindrical portion that is fixed by crimping in the crimping groove and extends in the axial direction, and an annular portion that extends radially outward from the axially inner end of the cylindrical portion, Have
The second seal portion includes a fourth lip portion extending outward in the axial direction and radially outward, and a fifth lip portion extending outward in the axial direction and radially inward.
The fourth lip portion and the fifth lip portion are in sliding contact with the exposed surface of the first metal core or form a labyrinth,
A first lip portion extending inward in the axial direction, a neck portion extending inward in the radial direction, and a radially inner end portion of the neck portion extend inward in the axial direction and outward in the axial direction at the inner peripheral edge of the first elastic member. The first seal part comprising a second lip part and a third lip part is formed,
The first lip portion forms a labyrinth with the annular portion of the second cored bar,
The second lip portion is in sliding contact with the annular portion of the second core metal or forms a labyrinth,
The rolling bearing with a sealing device, wherein the third lip portion is in sliding contact with the cylindrical portion of the second core bar or forms a labyrinth .
(3) an outer ring that is a rotating raceway;
An inner ring which is a fixed race,
Between the outer ring and the inner ring, a plurality of rolling elements that are held movably by a cage,
A pair of sealing devices that are arranged on both axial sides of the rolling element and seal an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring;
A rolling bearing with a sealing device comprising:
The sealing device is disposed between the first sealing member and the rolling element in the axial direction, and a substantially annular first sealing member fixed to both axial ends of the inner peripheral surface of the outer ring. And a substantially annular second sealing member fixed to the outer peripheral surface of the inner ring,
The first sealing member is formed by covering a first metal core with a first elastic member,
The first elastic member forms a pre-Symbol second sealing member and the inner ring and the sliding contact or labyrinth has a first seal portion,
The outer surface in the axial direction of the first metal core is all covered with the first elastic member,
An exposed surface in which the first metal core is exposed in an annular shape is formed on the inner surface in the axial direction of the first metal core,
The second sealing member is formed on a metal second metal core and a radially outer portion of the second metal core, and is in sliding contact with the exposed surface of the first metal core or forms a labyrinth. a second sealing portion formed of a member, Ri Tona,
A pair of stepped portions having a smaller diameter than the outer peripheral surface of the inner ring are provided at both axial ends of the outer peripheral surface of the inner ring,
A concave groove is formed in the axially inner portion of the pair of stepped portions,
The second metal core of the second sealing member is formed with a third elastic member so as to cover the inner side surface in the axial direction and the inner side surface in the radial direction, and an annular portion extending outward in the radial direction; An arcuate portion connected to the radially outer end and extending outward in the axial direction toward the radially outer side;
By fitting the third elastic member into the concave groove, the second sealing member is fixed to the inner ring,
The second seal part made of the second elastic member is formed on the annular part and the arc part of the second cored bar,
The second seal portion has a sixth lip portion extending outward in the axial direction and radially inward,
The sixth lip portion is in sliding contact with the exposed surface of the first cored bar or forms a labyrinth;
A labyrinth is formed between the radially outer surface of the arc portion and the first sealing member,
A first lip portion extending inward in the axial direction, a neck portion extending inward in the radial direction, and a radially inner end portion of the neck portion extend inward in the axial direction and outward in the axial direction at the inner peripheral edge of the first elastic member. The first seal part comprising a second lip part and a third lip part is formed,
The first lip portion forms a labyrinth with the annular portion of the second cored bar,
The second lip portion is in sliding contact with the annular portion of the second core metal or forms a labyrinth,
The rolling bearing with a sealing device, wherein the third lip portion is in sliding contact with the stepped portion or forms a labyrinth .

According to the rolling bearing with a sealing device of the present invention, the first elastic member of the first sealing member is in sliding contact with the second sealing member or forms a labyrinth, or is in sliding contact with the second sealing member and the inner ring or labyrinth. A second elastic member that has a first seal portion to be formed, and the second sealing member is formed on a radially outer portion of the second cored bar and is in sliding contact with the exposed surface of the first cored bar or forms a labyrinth. Therefore, it is possible to prevent the grease inside the bearing from leaking to the outside and to prevent foreign matter from entering the inside from the outside of the bearing and maintain good sealing performance.
In addition, since the outer ring is a rotating raceway and the inner ring is a fixed raceway, if a foreign object approaches or adheres to the first sealing member fixed to the outer ring, the outer ring is shaken off by a centrifugal force, and the first seal It is possible to prevent foreign matter from approaching the part. Thereby, it is possible to further suppress entry of foreign matter into the bearing.
In addition, since the second sealing member is fixed to the inner ring that is a fixed raceway that is not affected by the centrifugal force, the second seal portion formed on the second sealing member is not affected by the centrifugal force. It is possible to ensure a stable sealing property.

It is principal part sectional drawing of the rolling bearing with a sealing device which concerns on 1st Embodiment. It is principal part sectional drawing of the rolling bearing with a sealing device which concerns on 2nd Embodiment. It is principal part sectional drawing of the rolling bearing with a sealing device which concerns on 3rd Embodiment. It is sectional drawing of the conventional rolling bearing with a sealing device. It is sectional drawing of the conventional sealing device.

  Hereinafter, a rolling bearing with a sealing device of each embodiment of the present invention will be described in detail based on the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a main part of a rolling bearing 1 with a sealing device according to a first embodiment of the present invention. Note that the rolling bearing 1 has a structure that is in line contrast with a center line C indicated by a one-dot chain line in FIGS. 1, 2, and 3.

  The outer ring 10, which is a rotating raceway ring, has a concave outer ring raceway surface 12 formed on an inner peripheral surface 11 thereof, and a concave engagement at both axial ends of the inner peripheral surface sandwiching the outer ring raceway surface 12. A groove 13 is formed.

  The inner ring 20 that is a fixed raceway has a concave inner ring raceway surface 22 formed on an outer peripheral surface 21 thereof, and step portions 23 are formed at both axial ends of the outer peripheral surface 21 sandwiching the inner ring raceway surface 22. ing.

  Between the outer ring raceway surface 12 and the inner ring raceway surface 22, balls 40 that are a plurality of rolling elements that are arranged at equal intervals in the circumferential direction by the cage 30 and are held so as to roll freely are arranged.

  A pair of sealing devices 3 arranged on both sides in the axial direction of the ball 40 between the outer ring 10 and the inner ring 20 seals the annular space between the inner peripheral surface 11 of the outer ring 10 and the outer peripheral surface 21 of the inner ring 20. The grease enclosed in the space is prevented from leaking to the outside, and foreign matters (for example, water, muddy water, dust, etc.) are prevented from entering the annular space.

  The sealing device 3 is disposed between the first sealing member 50 and the ball 40 in the axial direction, and a substantially annular first sealing member 50 fixed to both axial ends of the inner peripheral surface 11 of the outer ring 10. And an annular second sealing member 60 fixed to the outer peripheral surface 21 of the inner ring 20.

  The second sealing member 60 is a metal first L-shaped cross section that includes a cylindrical portion 61 that extends in the axial direction and an annular portion 62 that extends radially outward from the axially inner end of the cylindrical portion 61. A two-core metal 69 is provided. A second seal portion 66 made of a second elastic member 68 such as rubber or elastomer is formed on the radially outer portion of the second cored bar 69. The second seal portion 66 extends outward in the axial direction and radially outward, and is in slidable contact with an exposed surface 57a of the first cored bar 52 of the first sealing member 50 described later with a certain tightening margin. And a fifth lip portion 66b extending inward in the axial direction and radially inward and in sliding contact with the exposed surface 57a of the first sealing member 50 with a certain tightening margin.

  A pair of stepped portions 23 having a diameter smaller than that of the outer peripheral surface 21 are provided at both axial ends of the outer peripheral surface 21 of the inner ring 20. The outer peripheral surface of the step part 23 is the circumferential surface 23a of the same diameter, and is open | released to the axial direction outer side. On the other hand, the inner side in the axial direction of the step portion 23 is a wall surface 23b that reaches the outer peripheral surface 21 substantially perpendicularly to the circumferential surface 23a.

  The second sealing member 60 is fixed to the outer circumferential surface 21 of the inner ring 20 by press-fitting the cylindrical portion 61 into the circumferential surface 23a until the annular portion 62 contacts the wall surface 23b.

  The annular portion 62 supports the fall of the second sealing member 60 by contacting the wall surface 23b. If the second sealing member 60 is sufficiently rigid and has sufficient radial dimensions, the cylindrical portion 61 is directly press-fitted into the outer peripheral surface 21 of the inner ring 20 without providing the step portion 23 in the inner ring 20. It doesn't matter.

  The annular portion 62 of the second metal core 69 of the second sealing member 60 illustrated in FIG. 1 is offset outward in the axial direction near the radial center. This is to avoid interference with the cage 30. In addition, an effect of increasing the rigidity of the second cored bar 69 can be expected. When the second sealing member 60 is sufficiently rigid and has a sufficient axial dimension, such an offset is unnecessary.

  The first sealing member 50 is formed by covering a first metal core 52 made of metal having a function of reinforcement with a first elastic member 51 such as rubber or elastomer, and the whole is formed in an annular plate shape. .

  The outer peripheral edge 53 of the first elastic member 51 is locked and fixed by press fitting or the like in a locking groove 13 formed at the axial end of the inner peripheral surface 11 of the outer ring 10. On the other hand, the inner peripheral edge 55 of the first elastic member 51 extends inward in the axial direction, is adjacent to the annular portion 62 of the second cored bar 69 of the second sealing member 60, and forms a labyrinth gap. 55a is provided.

  The first lip portion 55a has a lip tip close to the annular portion 62 to form a labyrinth gap, and by matching the lip shape to the axial offset shape of the annular portion 62 described above, a wider range of labyrinth It is possible to set a gap.

  The inner peripheral edge 55 of the first elastic member 51 is further provided with a neck 55d extending radially inward and a second core 69 of the second sealing member 60 extending axially inward from the radially inner end of the neck 55d. A second lip portion 55b slidably in contact with the annular portion 62 of the second sealing member 60 and a cylindrical portion 61 of the second cored bar 69 of the second sealing member 60 extending in the axially outer side and the radial inner side. A first seal portion 55e is formed that includes a third lip portion 55c that comes into sliding contact with a tightening margin.

  The neck portion 55d has an annular shape with a narrow axial width, and the followability of the second lip portion 55b and the third lip portion 55c is enhanced by reducing the rigidity. Further, the neck portion 55d is inclined so that the inner side is positioned on the inner side in the axial direction than the outer side in the radial direction, so that when the outer ring 10 which is a rotating raceway rotates, the neck portion 55d is centered by centrifugal force. A moment is generated, the second lip portion 55b is pressed against the annular portion 62 toward the inner side in the axial direction, and the third lip portion 55c is inclined to the cylindrical portion 61 toward the inner side in the axial direction and radially inward. It can be pressed.

  Since the second core metal 69 is made by press-molding a plate material, the slidable contact surfaces of the annular portion 62 in which the second lip portion 55b is in slidable contact and the cylindrical portion 61 in which the third lip portion 55c is in slidable contact are as follows. The surface has a low surface roughness. Furthermore, it is possible to obtain a good surface with a lower surface ancestry by subjecting these sliding surfaces to surface pressing.

  The entire outer surface 56 of the first core metal 52 is covered with the first elastic member 51 for rust prevention. On the other hand, the axially inner side surface 57 of the first metal core 52 is covered with the first elastic member 51 so that the fourth lip portion 66a and the fifth lip portion 66b of the second sealing member 60 are in sliding contact. Instead, an exposed surface 57a is provided on which the first core metal 52 is exposed in an annular shape.

  Since the first core metal 52 is made by press-molding a plate material, the exposed surface 57a where the fourth lip portion 66a and the fifth lip portion 66b are in sliding contact with each other has a low surface roughness. Furthermore, it is possible to obtain a good surface with a lower surface ancestry by subjecting the exposed surface 57a to surface pressing or the like.

  Further, the first sealing member 50 shown in FIG. 1 is offset outward in the axial direction with respect to the locking groove 13 of the outer ring 10. This is to keep the axial width of the sealing device 3 small, and is not an essential configuration. If there is a margin in the axial dimension, such an offset is unnecessary.

  As described above, according to the rolling bearing 1 of the present embodiment, the first sealing member 50 has the first seal portion 55e that is in sliding contact with the second sealing member 60, and the second sealing member 60 is the first sealing member. Since it has the 2nd seal part 66 which slidably contacts with exposed surface 57a of the 1st metal core 52 of member 50, it suppresses that the grease inside a bearing leaks outside, and a foreign material permeating into the inside from the outside of a bearing, It is possible to maintain good sealing performance.

  Further, since the outer ring 10 is a rotating raceway and the inner ring 20 is a fixed raceway, when a foreign substance approaches or adheres to the first sealing member 50 fixed to the outer ring 10, it is shaken off by centrifugal force. It is possible to prevent foreign matter from approaching the first seal portion 55e. Thereby, it is possible to further suppress entry of foreign matter into the bearing. Further, since the second sealing member 60 is fixed to the inner ring 20 that is a fixed raceway ring that is not affected by the centrifugal force, the second seal portion 66 formed on the second sealing member 60 is affected by the centrifugal force. Stable sealability can be secured without receiving.

(Second Embodiment)
Next, a rolling bearing with a sealing device according to a second embodiment of the present invention will be described. In addition, since the structure of the rolling bearing 1 with a sealing device of this embodiment makes the fundamental structure the same as 1st Embodiment, description is abbreviate | omitted or simplified by attaching | subjecting the same code | symbol to the same or an equivalent part.

  In the present embodiment, a caulking groove 24 is recessed in the axially inner portion of the circumferential surface 23 a of the step portion 23 of the inner ring 20. The second sealing member 60 is fixed to the inner ring 20 by the cylindrical portion 61 being caulked in the caulking groove 24.

  Here, in the first seal portion 55e of the first sealing member 50, the second lip portion 55b is in sliding contact with the annular portion 62 of the second sealing member 60 with a certain tightening margin, and the third lip portion 55c is in contact with the first lip portion 55c. A labyrinth gap is formed between the cylindrical portion 61 of the two sealing members 60.

  Even with this configuration, it is possible to achieve the same effects as those of the first embodiment.

(Third embodiment)
Next, a rolling bearing according to a third embodiment of the present invention will be described. In addition, since the structure of the rolling bearing 1 with a sealing device of the present embodiment is the same as that of the first and second embodiments, the same or corresponding parts are denoted by the same reference numerals and the description thereof is omitted or simplified. Turn into.

  In the present embodiment, a concave groove 25 is formed on the inner side in the axial direction of the circumferential surface 23 a of the step portion 23 of the inner ring 20. Unlike the above-described embodiment, the second sealing member 60 does not have the cylindrical portion 61, and the radially inner portion of the annular portion 62 covers the axial inner side surface 63 and the radial inner side surface 64. As described above, a third elastic member 70 such as rubber or elastomer is formed. The second sealing member 60 is fixed to the inner ring 20 by fitting the third elastic member 70 into the concave groove 25. By comprising in this way, it is possible to suppress the foreign material penetration | invasion from between the 2nd sealing member 60 and the inner ring | wheel 20 more.

  Further, in the present embodiment, the first seal portion 55e of the first sealing member 50 has the second lip portion 55b slidably contacting the annular portion 62 of the second sealing member 60 with a certain tightening margin, and the third lip The portion 55c is slidably contacted with the circumferential surface 23a of the step portion 23 of the inner ring 20 with a certain tightening allowance to ensure sealing performance.

  Furthermore, the second sealing member 60 has an arc portion 67 having a substantially arc-shaped cross section that is connected to the radially outer end of the annular portion 62 and extends outward in the axial direction toward the radially outer side. . The radially outer side surface 67a of the arc portion 67 and the radially inner side surface 54 of the axially offset portion of the first elastic member 51 are disposed to face each other via a radial clearance to form a labyrinth clearance. The second elastic member 68 and the second seal portion 66 are shaped to follow the radially outer portion of the annular portion 62 and the arc portion 67, and extend to the axially outer side and the radially inner side. The sixth lip portion 66c is in sliding contact with the exposed surface 57a of the first cored bar 52 with a certain tightening margin. Here, in the labyrinth gap formed between the radially outer surface 67a of the arc portion 67 and the radially inner surface 54 of the axial offset portion of the first elastic member 51, grease inside the bearing leaks to the outside. The sixth lip 66c prevents further intrusion when foreign matter enters from between the second sealing member 60 and the inner peripheral edge 55 of the first sealing member 50.

  By configuring in this way, the same effects as those of the first and second embodiments can be obtained.

  In addition, this invention is not limited to each embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.

  For example, the first sealing portion 55e of the first sealing member 50 is not limited to the configuration in sliding contact with the second sealing member 60, and the configuration forming the labyrinth with the second sealing member 60, the second sealing member 60, the inner ring 20 and the like. It may be configured to form a sliding contact or a labyrinth. Moreover, the 2nd seal part 66 of the 2nd sealing member 60 is not limited to the structure which slidably contacts with the exposed surface 57a of the 1st metal core 52, The structure which forms a labyrinth with the exposed surface 57a may be sufficient.

  In the first and second embodiments, the shapes of the arc portion 67 of the second sealing member 60 and the second seal portion 66 of the second elastic member 68 in the third embodiment may be applied. In the third embodiment, the formation of the second seal portion 66 of the second elastic member 68 in the first and second embodiments may be applied.

  In the above-described embodiment, the second sealing member 60 is fixed by press-fitting, crimping, or fitting to the outer peripheral surface 21 of the inner ring 20, but may be fixed by locking. . Further, when the first sealing member 50 is fixed to the inner peripheral surface 11 of the outer ring 10, it may be fixed by any method such as press-fitting, caulking, fitting, or locking.

  In each of the above-described embodiments, the present invention has been described using an example in which the present invention is applied to a deep groove ball bearing. However, a double-row ball bearing as in Patent Document 1, a roller bearing using a plurality of rollers as rolling elements, and the like. It is also possible to apply to.

DESCRIPTION OF SYMBOLS 1 Rolling bearing with a sealing device 3 Sealing device 10 Outer ring 11 Inner peripheral surface 12 Outer ring raceway groove 13 Locking groove 20 Inner ring 21 Outer peripheral surface 22 Inner ring raceway groove 23 Step 23a Circumferential surface 23b Wall surface 24 Caulking groove 25 Concave groove 30 Holding 40 balls (rolling elements)
50 First sealing member 51 First elastic member 52 First metal core 56 Axial outer side surface 57 Axial inner side surface 53 Outer peripheral edge portion 54 Radial inner side surface 55 Inner peripheral edge portion 55a First lip portion 55b Second lip portion 55c First 3 lip portion 55d neck portion 55e first seal portion 57a exposed surface 60 second sealing member 61 cylindrical portion 62 annular portion 63 axial inner side surface 64 radial inner side surface 66 second seal portion 66a fourth lip portion 66b fifth lip portion 66c Sixth lip portion 67 Arc portion 67a Radial outer side surface 68 Second elastic member 69 Second metal core 70 Third elastic member C Center line

Claims (3)

An outer ring that is a rotating raceway,
An inner ring which is a fixed race,
Between the outer ring and the inner ring, a plurality of rolling elements that are held movably by a cage,
A pair of sealing devices that are arranged on both axial sides of the rolling element and seal an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring;
A rolling bearing with a sealing device comprising:
The sealing device is disposed between the first sealing member and the rolling element in the axial direction, and a substantially annular first sealing member fixed to both axial ends of the inner peripheral surface of the outer ring. And a substantially annular second sealing member fixed to the outer peripheral surface of the inner ring,
The first sealing member is formed by covering a first metal core with a first elastic member,
The first elastic member, you forming the second sealing member and the sliding contact or labyrinth has a first seal portion,
The outer surface in the axial direction of the first metal core is all covered with the first elastic member,
An exposed surface in which the first metal core is exposed in an annular shape is formed on the inner surface in the axial direction of the first metal core,
The second sealing member is formed on a metal second metal core and a radially outer portion of the second metal core, and is in sliding contact with the exposed surface of the first metal core or forms a labyrinth. a second sealing portion formed of a member, Ri Tona,
A pair of stepped portions having a smaller diameter than the outer peripheral surface of the inner ring are provided at both axial ends of the outer peripheral surface of the inner ring,
The second cored bar of the second sealing member has a cylindrical portion that is press-fitted and fixed to the stepped portion and extends in the axial direction, and an annular portion that extends radially outward from the axially inner end of the cylindrical portion. And
The second seal portion includes a fourth lip portion extending outward in the axial direction and radially outward, and a fifth lip portion extending outward in the axial direction and radially inward.
The fourth lip portion and the fifth lip portion are in sliding contact with the exposed surface of the first metal core or form a labyrinth,
A first lip portion extending inward in the axial direction, a neck portion extending inward in the radial direction, and a radially inner end portion of the neck portion extend inward in the axial direction and outward in the axial direction at the inner peripheral edge of the first elastic member. The first seal part comprising a second lip part and a third lip part is formed,
The first lip portion forms a labyrinth with the annular portion of the second cored bar,
The second lip portion is in sliding contact with the annular portion of the second core metal or forms a labyrinth,
The rolling bearing with a sealing device, wherein the third lip portion is in sliding contact with the cylindrical portion of the second core bar or forms a labyrinth . An outer ring that is a rotating raceway,
An inner ring which is a fixed race,
Between the outer ring and the inner ring, a plurality of rolling elements that are held movably by a cage,
A pair of sealing devices that are arranged on both axial sides of the rolling element and seal an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring;
A rolling bearing with a sealing device comprising:
The sealing device is disposed between the first sealing member and the rolling element in the axial direction, and a substantially annular first sealing member fixed to both axial ends of the inner peripheral surface of the outer ring. And a substantially annular second sealing member fixed to the outer peripheral surface of the inner ring,
The first sealing member is formed by covering a first metal core with a first elastic member,
The first elastic member, you forming the second sealing member and the sliding contact or labyrinth has a first seal portion,
The outer surface in the axial direction of the first metal core is all covered with the first elastic member,
An exposed surface in which the first metal core is exposed in an annular shape is formed on the inner surface in the axial direction of the first metal core,
The second sealing member is formed on a metal second metal core and a radially outer portion of the second metal core, and is in sliding contact with the exposed surface of the first metal core or forms a labyrinth. a second sealing portion formed of a member, Ri Tona,
A pair of stepped portions having a smaller diameter than the outer peripheral surface of the inner ring are provided at both axial ends of the outer peripheral surface of the inner ring,
A caulking groove is recessed in the axially inner portion of the pair of stepped portions,
The second core metal of the second sealing member is a cylindrical portion that is fixed by crimping in the crimping groove and extends in the axial direction, and an annular portion that extends radially outward from the axially inner end of the cylindrical portion, Have
The second seal portion includes a fourth lip portion extending outward in the axial direction and radially outward, and a fifth lip portion extending outward in the axial direction and radially inward.
The fourth lip portion and the fifth lip portion are in sliding contact with the exposed surface of the first metal core or form a labyrinth,
A first lip portion extending inward in the axial direction, a neck portion extending inward in the radial direction, and a radially inner end portion of the neck portion extend inward in the axial direction and outward in the axial direction at the inner peripheral edge of the first elastic member. The first seal part comprising a second lip part and a third lip part is formed,
The first lip portion forms a labyrinth with the annular portion of the second cored bar,
The second lip portion is in sliding contact with the annular portion of the second core metal or forms a labyrinth,
The rolling bearing with a sealing device, wherein the third lip portion is in sliding contact with the cylindrical portion of the second core bar or forms a labyrinth . An outer ring that is a rotating raceway,
An inner ring which is a fixed race,
Between the outer ring and the inner ring, a plurality of rolling elements that are held movably by a cage,
A pair of sealing devices that are arranged on both axial sides of the rolling element and seal an annular space between an inner peripheral surface of the outer ring and an outer peripheral surface of the inner ring;
A rolling bearing with a sealing device comprising:
The sealing device is disposed between the first sealing member and the rolling element in the axial direction, and a substantially annular first sealing member fixed to both axial ends of the inner peripheral surface of the outer ring. And a substantially annular second sealing member fixed to the outer peripheral surface of the inner ring,
The first sealing member is formed by covering a first metal core with a first elastic member,
The first elastic member forms a pre-Symbol second sealing member and the inner ring and the sliding contact or labyrinth has a first seal portion,
The outer surface in the axial direction of the first metal core is all covered with the first elastic member,
An exposed surface in which the first metal core is exposed in an annular shape is formed on the inner surface in the axial direction of the first metal core,
The second sealing member is formed on a metal second metal core and a radially outer portion of the second metal core, and is in sliding contact with the exposed surface of the first metal core or forms a labyrinth. a second sealing portion formed of a member, Ri Tona,
A pair of stepped portions having a smaller diameter than the outer peripheral surface of the inner ring are provided at both axial ends of the outer peripheral surface of the inner ring,
A concave groove is formed in the axially inner portion of the pair of stepped portions,
The second metal core of the second sealing member is formed with a third elastic member so as to cover the inner side surface in the axial direction and the inner side surface in the radial direction, and an annular portion extending outward in the radial direction; An arcuate portion connected to the radially outer end and extending outward in the axial direction toward the radially outer side;
By fitting the third elastic member into the concave groove, the second sealing member is fixed to the inner ring,
The second seal part made of the second elastic member is formed on the annular part and the arc part of the second cored bar,
The second seal portion has a sixth lip portion extending outward in the axial direction and radially inward,
The sixth lip portion is in sliding contact with the exposed surface of the first cored bar or forms a labyrinth;
A labyrinth is formed between the radially outer surface of the arc portion and the first sealing member,
A first lip portion extending inward in the axial direction, a neck portion extending inward in the radial direction, and a radially inner end portion of the neck portion extend inward in the axial direction and outward in the axial direction at the inner peripheral edge of the first elastic member. The first seal part comprising a second lip part and a third lip part is formed,
The first lip portion forms a labyrinth with the annular portion of the second cored bar,
The second lip portion is in sliding contact with the annular portion of the second core metal or forms a labyrinth,
The rolling bearing with a sealing device, wherein the third lip portion is in sliding contact with the stepped portion or forms a labyrinth .

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