JP2017207144A - Rolling bearing and bearing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing which can lubricate an interior part of a bearing and inner and outer peripheral surfaces of the bearing and a neck surface of a rotary shaft while reducing the usage of grease, and to provide a bearing device.SOLUTION: A self-aligning roller bearing 30 includes a pair of seal members 35, 35 provided at both axial end parts of an outer ring 31. First grease G1 is enclosed in a bearing space S1. On an outer peripheral surface of the outer ring 31, a grease circulation groove 40 opening at both axial ends of the outer ring 31 and in which second grease G2 is circulated is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rolling bearing and a bearing device, and more particularly to a rolling bearing and a bearing device using grease lubrication, which are applied to a guide roller for continuous casting, a table roller, a conveyor and the like.

  For example, a bearing device using a rolling bearing is applied to various rolls used in steel equipment such as continuous casting equipment and hot / cold rolling equipment (see, for example, Patent Document 1).

  For example, in the conventional bearing device 100 shown in FIG. 13, the outer ring 31 of the self-aligning roller bearing 30 that supports the shaft portion 2 of the roll 1 is fitted into the cylindrical chock 3 that is a housing, and is provided in the chock 3. A grease supply device (not shown) is connected to the oil supply path 4. Further, the self-aligning roller bearing 30 is an open type that does not have a seal member on both sides in the axial direction, and further, a sealing device 7, between the shaft portion 2 and the lid members 5, 6 fixed to the chock 3, 8 is attached. Then, by supplying grease from the oil supply path 4 at regular intervals, the grease is supplied to the bearing space S1 of the self-aligning roller bearing 30 through the oil hole 31a of the outer ring 31. Thereafter, when grease replenishment is repeated at predetermined intervals, the grease in the bearing space S1 is gradually discharged and filled into the internal spaces S2 and S3 between the chock 3 and the shaft portion 2. In this state, the inside of the bearing, the outer peripheral surface and inner peripheral surface of the bearing, and the sealing devices 7 and 8 were lubricated. Further, when the bearing space S1 and the internal spaces S2 and S3 are filled with grease, the grease is discharged from the lip portions of the sealing devices 7 and 8. Further, when the grease discharge path pipe is provided in the housing, the grease is discharged from the discharge path pipe to the outside. Accordingly, the bearing space S1 of the self-aligning roller bearing 30 is grease-lubricated, and the inner peripheral surface of the bearing and the neck surface of the shaft portion 2 are also grease-lubricated to prevent wear and fretting.

  Further, in the bearing device described in Patent Document 1, lubricating oil is supplied from the oil supply port provided outside the housing through the oil hole provided in the bearing outer ring into the bearing and inside the housing.

Japanese Utility Model Publication No. 7-25333

By the way, the bearing device used for the above-mentioned roll is used in a severe environment covered with water, water vapor, and scale, and the lip portion (rubber seal) of the sealing devices 7 and 8 is deteriorated, so that water, dust and the like are inside the bearing. Intrusion into the bearing may cause premature damage to the bearing. For this reason, since a large amount of grease is injected into the bearing for the purpose of preventing water and dust from entering, a lot of grease is required. For this reason, a bearing device that can reduce the amount of grease used is desired in the market in consideration of the environment.
Further, the bearing device described in Patent Document 1 is oil lubricated, and it is necessary to keep the oil level at an appropriate position. Therefore, the housing discharge mechanism is complicated, and care is required for maintenance.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a rolling bearing capable of lubricating the inside of the bearing, the inner peripheral surface of the bearing, and the neck surface of the rotating shaft while reducing the amount of grease used. And providing a bearing device.

The above object of the present invention can be achieved by the following constitution.
(1) An outer ring, an inner ring, a plurality of rolling elements disposed between an outer ring raceway surface formed on an inner peripheral surface of the outer ring and an inner ring raceway surface formed on an outer peripheral surface of the inner ring, and an axial direction A pair of sealing members provided at both ends,
The first grease is sealed in the bearing space,
The outer peripheral surface of the outer ring, the outer peripheral surface of the aligning wheel that is slidably fitted to the outer peripheral surface of the outer ring, or the inner peripheral surface of the sleeve that is fitted to the outer peripheral surface of the outer ring are provided at both axial ends. A rolling bearing characterized in that a groove for grease circulation is formed to open and to circulate the second grease.
(2) the shaft,
A housing;
The rolling bearing according to (1), which is disposed between the shaft portion and the housing;
A pair of sealing devices for sealing a pair of internal spaces between the housing and the shaft portion on both axial sides of the rolling bearing;
A bearing device comprising:
The grease circulation groove communicates the pair of internal spaces,
The bearing device, wherein the housing is formed with a supply hole communicating with the grease circulation groove and supplying the second grease from the outside.
(3) the shaft,
A housing;
The rolling bearing according to (1), which is disposed between the shaft portion and the housing;
A pair of sealing devices for sealing a pair of internal spaces between the housing and the shaft portion on both axial sides of the rolling bearing;
A bearing device comprising:
The grease circulation groove communicates the pair of internal spaces,
A supply hole for supplying the second grease from the outside to the internal space on one side in the axial direction is formed in the lid member fixed to the housing.
The bearing device, wherein the second grease supplied to the internal space on the one axial side is supplied to the internal space on the other axial side through the grease circulation groove.
(4) The lid member fixed to the housing includes a cylindrical portion that contacts the axial end surface of the outer ring,
The cylindrical portion is formed with a communication path that communicates the grease circulation groove and the internal space, and is in the same phase in the circumferential direction as the communication path and at a position shifted in the radial direction. The bearing device according to (2) or (3), wherein a protrusion that fits into the grease circulation groove is provided.
(5) The lid member fixed to the housing includes a cylindrical portion that contacts the axial end surface of the outer ring,
The cylindrical portion is formed with a communication path that communicates the grease circulation groove and the internal space, and the outer ring is separately provided with the grease circulation groove at a position shifted in a circumferential direction from the communication path. The bearing device according to (2) or (3), further including another key groove into which a key that fits into the formed key groove is inserted.
(6) The lid member fixed to the housing includes a cylindrical portion that contacts the axial end surface of the outer ring,
In the cylindrical portion, a communication path that communicates the groove and the internal space is formed, and in a key groove formed separately from the groove in the outer ring at a position shifted in the circumferential direction from the communication path. The bearing device according to (2) or (3), wherein a protrusion that fits in is provided.
(7) The bearing device according to any one of (2) to (6), wherein the first grease and the second grease are different in at least a part of the composition.

  The rolling bearing according to the present invention includes a pair of seal members provided at both ends in the axial direction, the first grease is sealed in the bearing space, and swings on the outer peripheral surface of the outer ring and the outer peripheral surface of the outer ring. On the outer peripheral surface of the aligning ring that can be fitted, or on the inner peripheral surface of the sleeve that fits on the outer peripheral surface of the outer ring, there is a grease circulation groove that opens at both ends in the axial direction and circulates the second grease. It is formed. Thus, the inside of the bearing of the rolling bearing is lubricated by the first grease so that the grease is not discharged from the bearing space. The inner space on both sides in the axial direction of the rolling bearing is provided with the second groove through the grease circulation groove. Since the grease can be spread, the inside of the bearing, the inner peripheral surface of the bearing, and the neck surface of the shaft portion can be lubricated while reducing the amount of grease used.

  According to the bearing device of the present invention, the grease circulation groove communicates with the pair of internal spaces, the housing communicates with the grease circulation groove, and the supply hole for supplying the second grease from the outside. Thus, grease can be stably supplied from the supply hole of the housing to the internal space through the grease circulation groove.

  According to the bearing device of the present invention, the grease circulation groove communicates the pair of internal spaces, and the lid member fixed to the housing has the second grease from the outside to the internal space on one side in the axial direction. A supply hole for supplying is formed, and the second grease supplied to the internal space on the one axial side is supplied to the internal space on the other axial side through the grease circulation groove. The grease can be stably supplied from the supply hole of the lid member to the internal space via the grease circulation groove without providing a supply path for supplying the grease from the outside.

It is sectional drawing of the bearing apparatus applied to the roll based on 1st Embodiment of this invention. (A) is a side view which shows the outer ring | wheel and cover member of the rolling bearing of FIG. 1, (b) is sectional drawing along the II-II line of (a). It is sectional drawing which shows the outer ring | wheel and lid member of a rolling bearing which concern on the modification of 1st Embodiment. It is sectional drawing of the bearing apparatus applied to the roll based on 2nd Embodiment of this invention. It is sectional drawing of the bearing apparatus applied to the roll based on 3rd Embodiment of this invention. (A) is a side view which shows the outer ring | wheel and lid member of the rolling bearing of FIG. 5, (b) is sectional drawing along the VI-VI line of (a), (c) is (a) FIG. 6 is a cross-sectional view taken along line VI′-VI ′. It is sectional drawing corresponding to FIG.6 (c) which concerns on the modification of 3rd Embodiment. It is sectional drawing of the bearing apparatus applied to the roll based on 4th Embodiment of this invention. It is sectional drawing of the bearing apparatus applied to the roll based on 5th Embodiment of this invention. It is sectional drawing of the bearing apparatus applied to the roll based on 6th Embodiment of this invention. It is sectional drawing of the bearing apparatus applied to the roll based on 7th Embodiment of this invention. (A) is the front view of the spacer of FIG. 11, (b) is the side view. It is sectional drawing of the bearing apparatus applied to the conventional roll.

  Hereinafter, a rolling bearing and a bearing device according to each embodiment of the present invention will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIG. 1, the bearing device 20 of the first embodiment is an automatic bearing that is a rolling bearing disposed between the shaft portion 2 of the roll 1, the chock 3 that is a housing, and the shaft portion 2 and the chock 3. A spherical roller bearing 30.

  The self-aligning roller bearing 30 includes an outer ring 31 fitted to the inner circumferential surface of the chock 3, an inner ring 32 fitted to the outer circumferential surface of the shaft portion 2, a single arc-shaped outer ring raceway surface and an inner ring 32 of the outer ring 31. The double-row barrel rollers 33, 33 disposed between the double-row arc-shaped inner ring raceway surfaces, the retainer 34 that holds the rollers 33, 33, and the axial direction of the outer ring 31. A pair of seal members 35 and 35 are attached to both ends and seal the inside of the bearing space S1.

  The outer ring 31 is positioned in the axial direction by the cover members 5 and 6 and the outer ring spacer 9 fixed to both ends in the axial direction of the chock 3. The inner ring 32 is positioned in the axial direction between the shoulder portion of the roll 1 and the nut 13 fastened to the shaft portion 2 via the seal seat 10 and the inner ring spacers 11 and 12.

  The bearing space S1 of the self-aligning roller bearing 30 is filled with a long-life first grease G1 such as lithium complex grease using mineral oil as a base oil. Lubricate. Lithium complex grease has a thickening agent made by reacting lithium hydroxide with fatty acid and dibasic acid, has a dropping point of 260 ° C or higher, has excellent heat resistance, water resistance, and rust prevention. In comparison, it can be used under high temperature conditions.

  The lithium complex soap is synthesized from a hydroxy aliphatic monocarboxylic acid having 12 to 24 carbon atoms containing lithium as a metal source and containing at least one hydroxyl group, and an aliphatic dicarboxylic acid having 2 to 12 carbon atoms. Examples of the hydroxy aliphatic monocarboxylic acid having 12 to 24 carbon atoms include 9-hydroxystearic acid, 10-hydroxystearic acid, 12-hydroxystearic acid, and 9,10-dihydroxystearic acid. Hydroxy stearic acid. Examples of the aliphatic dicarboxylic acid having 2 to 12 carbon atoms include succinic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, peric acid, azelaic acid, sebacic acid, dodecanedioic acid, etc. Azealine acid. The proportion of the aliphatic dicarboxylic acid having 2 to 12 carbon atoms in the total amount of the hydroxy aliphatic monocarboxylic acid having 12 to 24 carbon atoms and the aliphatic dicarboxylic acid having 2 to 12 carbon atoms is 20 to 40% by mass. It is important that When the ratio is less than 20% by mass and more than 40% by mass, a thermally stable lithium complex soap cannot be obtained.

  An internal space S2 between the chock 3 and the shaft portion 2 between the lid member 5 and the seal seat 10 and between the lid member 6 and the nut 13 on both axial sides of the self-aligning roller bearing 30. A pair of sealing devices 7 and 8 are provided for sealing S3.

The outer ring 31 has a grease circulation groove 40 that extends to both ends in the axial direction and opens at both ends in the axial direction, communicates with the pair of internal spaces S2 and S3, and circulates the second grease G2. It is formed.
The grease circulation groove 40 is not limited to a linear shape extending in the axial direction, and may be processed obliquely in the circumferential direction. Further, the grease circulation groove 40 is provided at an arbitrary position in the non-load zone of the self-aligning roller bearing 30.

  Further, the chock 3 is formed with a supply hole 41 which communicates with the grease circulation groove 40 and supplies the second grease G2 from the outside.

Further, both end portions 40a, 40b of the grease circulation groove 40 are connected to the internal space S2, via the communication passage 42 formed in the outer ring spacer 9 and the communication passage 43 formed in the cylindrical portion 6a of the lid member 6. Each communicates with S3. Thereby, the second grease G2 injected from the outside of the chock 3 and passing between the supply hole 41 and the grease circulation groove 40 and the inner peripheral surface of the chock 3 is supplied to the internal spaces S2 and S3. . The second grease G2 supplied to the inner spaces S2 and S3 lubricates the inner peripheral surface of the bearing and the neck surface 2a of the shaft portion 2, and then discharge ports (not shown) provided in the inner spaces S2 and S3. )). In addition, when the discharge port which discharges | emits 2nd grease G2 is not provided in the housing, 2nd grease G2 is discharged | emitted from the seal | sticker of the sealing devices 7 and 8 outside.
The second grease G2 supplied to the internal spaces S2 and S3 is at least partly different in composition from the first grease G1, for example, a thickening agent made of lithium soap based on mineral oil. Grease etc. are used.

As shown in FIG. 2, the cylindrical portion 6a of the lid member 6 that contacts the axial end surface of the outer ring 31 is formed with a communication path 43 that connects the grease circulation groove 40 and the internal space S3. A protrusion 46 that fits in the groove 40 for circulating grease is provided at a position that is in the same phase in the circumferential direction as 43 and shifted in the radial direction. As a result, the protrusion 46 functions to prevent the outer ring 31 from rotating, and the grease circulation groove 40 can be prevented from turning around the load area.
In the embodiment shown in FIG. 2, the protrusion 46 is formed on the radially inner side with respect to the communication path 43. However, as in the modification shown in FIG. It may be formed radially outside.
Further, in the present embodiment, the protrusion 46 is provided on the cylindrical portion 6a of the lid member 6, but may be provided on the outer ring spacer 9 and has the same phase in the circumferential direction as the communication path 42, and What is necessary is just to be provided in the position which shifted | deviated to the radial direction so that it may fit in the groove | channel 40 for grease circulation.

  As described above, according to the self-aligning roller bearing 30 of the present embodiment, the pair of seal members 35, 35 provided at both axial ends of the outer ring 31 are provided, and the first space is provided in the bearing space S1. A grease circulation groove 40 is formed on the outer peripheral surface of the outer ring 31 so as to open at both ends in the axial direction of the outer ring 31 and to circulate the second grease G2. Thereby, the bearing space S1 of the self-aligning roller bearing 30 is lubricated by the first grease G1, and no grease is discharged from the bearing space S1, and the internal spaces on both sides in the axial direction of the self-aligning roller bearing 30. In S2 and S3, the second grease G2 can be spread through the grease circulation groove 40. Accordingly, the amount of grease used can be reduced to about 1/15 to 1/5 of the conventional one, and the inside of the bearing, the inside / outside diameter surface of the bearing and the neck surface 2a of the rotating shaft can be lubricated. Further, the second grease G2 may be supplied intermittently or continuously. Further, by forming the grease circulation groove 40, the location where the second grease G2 is supplied from the outside can be one.

  Further, according to the bearing device 20 of the present embodiment, the grease circulation groove 40 communicates with the pair of internal spaces S2 and S3, and the chock 3 communicates with the grease circulation groove 40 and the second grease G2. Is formed from the outside, so that the second grease G2 can be stably supplied from the supply hole 41 of the chock 3 to the internal spaces S2 and S3 through the grease circulation groove 40. it can.

  Further, the lid member 6 fixed to the chock 3 includes a cylindrical portion 6a that contacts the axial end surface of the outer ring 31, and the cylindrical portion 6a communicates with the grease circulation groove 40 and the internal spaces S2 and S3. A passage 42 is formed, and a projection 46 that fits in the grease circulation groove 40 is provided at a position that is in the same phase in the circumferential direction as the communication passage 42 and that is displaced in the radial direction. It is possible to prevent rotation of the grease circulation groove 40 from entering the load area.

  Further, since the first grease G1 and the second grease G2 are different in at least part of the composition, they are used for lubricating the inside of the self-aligning roller bearing 30 and lubricating the inner and outer diameter surfaces of the bearing and the neck surface 2a of the rotating shaft. A suitable grease can be applied to each.

(Second Embodiment)
Next, the bearing device 20a of the second embodiment will be described with reference to FIG. In the bearing device 20a of the present embodiment, a cylindrical roller bearing 50 with a centering ring is used instead of the self-aligning roller bearing 30 as a rolling bearing.

A cylindrical roller bearing 50 with an aligning ring has an outer ring raceway surface on an inner peripheral surface, an outer ring 51 having an outer peripheral surface having a spherical shape, and a spherical inner periphery that is slidably fitted to the outer peripheral surface of the outer ring 51. A centering ring 52 fitted to the inner peripheral surface of the chock 3, an inner ring raceway surface having an inner ring raceway surface and fitting to the outer peripheral surface of the shaft portion 2, an inner ring raceway surface and an outer ring. Attached to both ends of the outer ring 51 in the axial direction of double-row cylindrical rollers 54, 54 that are rotatably arranged between the raceway surfaces, a cage 55 that holds the cylindrical rollers 54, 54 in a freely rollable manner. And a pair of seal members 56 and 56 for sealing the inside of the bearing space S1.
Also in this embodiment, the outer peripheral surface of the aligning ring 52 extends to both ends in the axial direction, opens at both ends in the axial direction, communicates with the pair of internal spaces S2 and S3, and the second grease G2 is provided. Circulating grease circulation grooves 40 are formed.

In the present embodiment, the inner ring 53 is axially disposed between the shoulder portion of the roll 1 and the fixing member 15 fastened to the shaft portion 2 via the seal seat 10 and the inner ring spacers 11 and 12. Is positioned.
For this reason, the pair of sealing devices 7 and 8 includes an internal space S2 between the chock 3 and the shaft portion 2 between the lid member 5 and the seal seat 10 and between the lid member 6 and the fixing member 15. , S3 is sealed.
Other configurations and operations are the same as those in the first embodiment.

(Third embodiment)
Next, a bearing device 20b according to a third embodiment will be described with reference to FIGS. In this embodiment, the mechanism for preventing the outer ring from rotating differs from that of the first embodiment. Since other configurations are the same as those in the first embodiment, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  Also in the present embodiment, the outer ring 31 has an outer circumferential surface that extends to both ends in the axial direction, opens at both ends in the axial direction, communicates with the pair of internal spaces S2 and S3, and circulates the second grease G2. A working groove 40 is formed. Further, as shown in FIG. 6, a key groove 47 is separately formed on the outer peripheral surface of the outer ring 31 in a phase different from that of the grease circulation groove 40.

The cylindrical portion 6a of the lid member 6 that contacts the axial end surface of the outer ring 31 has a communication passage 43 that communicates the grease circulation groove 40 and the internal spaces S2 and S3, as well as the communication passage 43 in the circumferential direction. Another key groove 48 is provided at a position in phase with the shifted key groove 47. Therefore, the key groove 47 and the other key groove 48 are formed in the outer ring 31 and the cylindrical portion 6a, and the key 49 fitted into the key groove 47 of the outer ring 31 and the other key groove 48 of the cylindrical portion 6a is used. Without providing the projection 46 on the lid member 6 as in the first embodiment, the outer ring 31 can be prevented from rotating, and the grease circulation groove 40 can be prevented from entering the load area.
Other configurations and operations are the same as those in the first embodiment.

  In the above embodiment, the key 49 is used. However, instead of using the key 49, the projection 70 may be provided on the cylindrical portion 6 a of the lid member 6. That is, as shown in FIG. 7, the cylindrical portion 6 a of the lid member 6 is provided with a protrusion 70 that protrudes in the axial direction from an end surface that contacts the axial end surface of the outer ring 31. Further, similarly to the above embodiment, a groove 47 similar to the key groove may be formed in the outer ring 31, and the protrusion 70 may be fitted into the groove 47.

(Fourth embodiment)
Next, a bearing device 20c according to a fourth embodiment will be described with reference to FIG. In the bearing device 20c of this embodiment, the case where the cylindrical roller bearing 50 with a centering ring is used instead of the self-aligning roller bearing 30 is shown as a rolling bearing similarly to 2nd Embodiment.

In the present embodiment, the aligning ring 52 is positioned in the axial direction by the cover members 5 and 6 and the outer ring spacers 9 and 14 fixed to both ends in the axial direction of the chock 3. The inner ring 53 is positioned in the axial direction between the shoulder portion of the roll 1 and the fixing member 15 fastened to the shaft portion 2 via the seal seat 10 and the inner ring spacers 11 and 12. .
For this reason, the pair of sealing devices 7 and 8 includes an internal space S2 between the chock 3 and the shaft portion 2 between the lid member 5 and the seal seat 10 and between the lid member 6 and the fixing member 15. , S3 is sealed.

Also in this embodiment, the outer peripheral surface of the aligning ring 52 extends to both ends in the axial direction, opens at both ends in the axial direction, communicates with the pair of internal spaces S2 and S3, and the second grease G2 is provided. Circulating grease circulation grooves 40 are formed. Both end portions 40a and 40b of the grease circulation groove 40 are communicated with the internal spaces S2 and S3 through communication passages 42 and 43 formed in the outer ring spacers 9 and 14, respectively.
Other configurations and operations are the same as those of the second embodiment.

(Fifth embodiment)
Next, a bearing device 20d according to a fifth embodiment will be described with reference to FIG. In addition, this embodiment differs in the supply path of 2nd grease G2 from the thing of 1st Embodiment. Since other configurations are the same as those in the first embodiment, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  Also in the present embodiment, a grease circulation groove 40 is formed on the outer peripheral surface of the outer ring 31 so as to extend to both ends in the axial direction, communicate with the pair of internal spaces S2 and S3, and circulate through the second grease G2. Is done. The lid member 6 fixed to the chock 3 is provided with a supply hole 44 for supplying the second grease G2 from the outside to the internal space S3 on one axial side.

  Thereby, the second grease G2 supplied to the internal space S3 on the one axial side passes through the communication path 43 of the lid member 6, the grease circulation groove 40 of the outer ring 31, and the communication path 42 of the outer ring spacer 9. , Supplied to the internal space S2 on the other side in the axial direction. The second grease G2 supplied to the internal spaces S2 and S3 on the one axial side and the other axial side lubricates the inner peripheral surface of the bearing and the neck surface 2a of the shaft portion 2, and then the other axial side. It is discharged from a discharge port (not shown) provided in the internal space S2. Note that no discharge port is provided in the internal space S3 on one side in the axial direction.

Accordingly, the bearing space S1 of the self-aligning roller bearing 30 is lubricated by the first grease G1, and no grease is discharged from the bearing space S1, and the internal spaces S2 on both sides in the axial direction of the self-aligning roller bearing 30. , S3 is configured such that a very small amount of the second grease G2 is supplied without providing a supply hole in the chock 3. Accordingly, the amount of grease used can be reduced to about 1/15 to 1/5 of the conventional one, and the inside of the bearing, the inside / outside diameter surface of the bearing, and the neck surface 2a of the rotating shaft can be lubricated. Further, by forming the grease circulation groove 40, the location where the second grease G2 is supplied from the outside can be one.
Other configurations and operations are the same as those in the first embodiment.

(Sixth embodiment)
Next, a bearing device 20e according to a sixth embodiment will be described with reference to FIG. In the present embodiment, the supply path of the second grease G2 is different from that of the fourth embodiment. Since other configurations are the same as those of the fourth embodiment, the same or equivalent parts as those of the fourth embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

In the present embodiment, the lid member 6 fixed to the chock 3 is provided with a supply hole 45 for supplying the second grease G2 from the outside to the internal space S2 on one axial side.
Thereby, the second grease G2 supplied to the inner space S3 on the one axial side is the communication path 43 of the outer ring spacer 14, the grease circulation groove 40 of the aligning ring 52, and the communication path 42 of the outer ring spacer 9. Is supplied to the inner space S2 on the other side in the axial direction. The second grease G2 supplied to the internal spaces S2 and S3 on the one axial side and the other axial side lubricates the inner peripheral surface of the bearing and the neck surface 2a of the shaft portion 2, and then the other axial side. It is discharged from a discharge port (not shown) provided in the internal space S2. Note that no discharge port is provided in the internal space S3 on one side in the axial direction.
Thereby, also in this embodiment, it is not necessary to process a supply hole in the chock 3, and the second grease G2 can be supplied to the internal spaces S2, S3.
Other configurations and operations are the same as those of the fourth embodiment.

(Seventh embodiment)
Next, a bearing device 20f according to a seventh embodiment will be described with reference to FIGS. In addition, this embodiment differs in the supply path of 2nd grease G2 from the thing of 1st Embodiment. Since other configurations are the same as those in the first embodiment, the same or equivalent parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted or simplified.

  In the present embodiment, a sleeve 60 having the same axial length as the outer ring 31 is fitted to the outer peripheral surface of the outer ring 31. For this reason, the grease circulation groove 40 through which the second grease G2 circulates is formed on the inner peripheral surface of the sleeve 60 so as to extend to both ends in the axial direction and open at both ends in the axial direction.

  The lid member 6 fixed to the chock 3 is provided with a supply hole 44 for supplying the second grease G2 from the outside to the internal space S3 on one axial side.

As a result, the second grease G2 supplied to the internal space S3 on the one axial side passes through the communication path 43 of the lid member 6, the grease circulation groove 40 of the sleeve 60, and the communication path 42 of the outer ring spacer 9. , Supplied to the internal space S2 on the other side in the axial direction. The second grease G2 supplied to the internal spaces S2 and S3 on the one axial side and the other axial side lubricates the inner peripheral surface of the bearing and the neck surface 2a of the shaft portion 2, and then the other axial side. It is discharged from a discharge port (not shown) provided in the internal space S2. Note that no discharge port is provided in the internal space S3 on one side in the axial direction.
Thereby, in this embodiment, it is not necessary to process a supply hole in the chock 3 and a groove for grease circulation in the outer ring 31, and the second grease G2 can be supplied to the internal spaces S2 and S3.
Other configurations and operations are the same as those in the first embodiment.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably.
The rolling bearing of the present invention can be applied to any rolling bearing, and is not limited to the self-aligning roller bearing of this embodiment or the cylindrical roller bearing with a aligning ring.

1 Roll 2 Shaft 3 Chock 5, 6 Lid member 20, 20a, 20b, 20c, 20d, 20e, 20f Bearing device 30 Spherical roller bearing (rolling bearing)
31 Outer ring 40 Grease circulation groove 50 Cylindrical roller bearing with aligning ring (rolling bearing)
51 Outer ring G1 First grease G2 Second grease S1 Bearing space S2, S3 Internal space

Claims (7)

An outer ring, an inner ring, a plurality of rolling elements disposed between an outer ring raceway surface formed on an inner peripheral surface of the outer ring and an inner ring raceway surface formed on an outer peripheral surface of the inner ring; A pair of sealing members provided,
The first grease is sealed in the bearing space,
The outer peripheral surface of the outer ring, the outer peripheral surface of the aligning wheel that is slidably fitted to the outer peripheral surface of the outer ring, or the inner peripheral surface of the sleeve that is fitted to the outer peripheral surface of the outer ring are provided at both axial ends. A rolling bearing characterized in that a groove for grease circulation is formed to open and to circulate the second grease. The shaft,
A housing;
The rolling bearing according to claim 1, wherein the rolling bearing is disposed between the shaft portion and the housing.
A pair of sealing devices for sealing a pair of internal spaces between the housing and the shaft portion on both axial sides of the rolling bearing;
A bearing device comprising:
The grease circulation groove communicates the pair of internal spaces,
The bearing device, wherein the housing is formed with a supply hole communicating with the grease circulation groove and supplying the second grease from the outside. The shaft,
A housing;
The rolling bearing according to claim 1, wherein the rolling bearing is disposed between the shaft portion and the housing.
A pair of sealing devices for sealing a pair of internal spaces between the housing and the shaft portion on both axial sides of the rolling bearing;
A bearing device comprising:
The grease circulation groove communicates the pair of internal spaces,
A supply hole for supplying the second grease from the outside to the internal space on one side in the axial direction is formed in the lid member fixed to the housing.
The bearing device, wherein the second grease supplied to the internal space on the one axial side is supplied to the internal space on the other axial side through the grease circulation groove. The lid member fixed to the housing includes a cylindrical portion that contacts the axial end surface of the outer ring,
The cylindrical portion is formed with a communication path that communicates the grease circulation groove and the internal space, and is in the same phase in the circumferential direction as the communication path and at a position shifted in the radial direction. 4. The bearing device according to claim 2, further comprising a protrusion fitted into the grease circulation groove. The lid member fixed to the housing includes a cylindrical portion that contacts the axial end surface of the outer ring,
The cylindrical portion is formed with a communication path that communicates the grease circulation groove and the internal space, and the outer ring is separately provided with the grease circulation groove at a position shifted in a circumferential direction from the communication path. The bearing device according to claim 2, further comprising another key groove into which a key that fits into the formed key groove is inserted. The lid member fixed to the housing includes a cylindrical portion that contacts the axial end surface of the outer ring,
In the cylindrical portion, a communication path that communicates the groove and the internal space is formed, and in a key groove formed separately from the groove in the outer ring at a position shifted in the circumferential direction from the communication path. 4. A bearing device according to claim 2 or 3, wherein a protrusion that fits into said is provided.   The bearing device according to any one of claims 2 to 6, wherein the first grease and the second grease are different in at least a part of the composition.

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