WO2015012337A1

WO2015012337A1 - Rolling bearing with sealing device

Info

Publication number: WO2015012337A1
Application number: PCT/JP2014/069522
Authority: WO
Inventors: 洋平柏倉; マレーアンダーソン
Original assignee: 日本精工株式会社
Priority date: 2013-07-26
Filing date: 2014-07-24
Publication date: 2015-01-29
Also published as: DE212014000158U1; AU2016100062A4; JP3200253U; CN205478944U; BR202016001335U2; BR212016001335U2

Abstract

The self-aligning rolling bearing with sealing device (100) is provided with: an inner race (11) with two track surfaces on the outer circumferential surface; an outer race (12) having a track surface, which is a spherically concave surface, on the inner circumferential surface; multiple rollers (13) provided in two rows between the respective track surfaces of the inner race (11) and the outer race (12) so as to roll freely; and a sealing device having seal holders (21) fixed on the edges of the inner race (11) or outer race (12) in the axial direction and seals (26) that are mounted on the seal holders (21). The seal holders (21) have bolt insertion holes (22) in the axial direction and the seal holders (21) are bolted to the edges of the inner race (11) or the outer race (12) in the axial direction through the bolt insertion holes (22). As a result, not only is it possible to improve maintenance but it is also possible to use the bearing in a position in which the bearing must be able to move in the axial direction or in a free side position.

Description

Rolling bearing with sealing device

The present invention relates to a rolling bearing with a sealing device.

Machines such as conveyors used in mining equipment are also used in harsh environments such as mountainous areas and desert areas. Therefore, it is desired that the bearings used in these machines be improved in durability and life by providing a sealing device (seal). As a conventional bearing provided with a seal member, a bearing that can prevent water and foreign matter from entering from both ends by fixing oil seals to seal cases at both ends of the outer ring has been proposed (for example, Patent Documents). 1).

In addition, machines such as conveyors used in mining equipment are often used under heavy load and impact load conditions. Therefore, a self-aligning roller bearing having a large load capacity is used in such a machine. As a conventional self-aligning roller bearing with a seal, a bearing has been proposed that can prevent water and foreign matter from entering from both ends by an oil seal that is installed by fitting a metal core to both ends of the outer ring. (For example, refer to Patent Document 2).

Japanese Laid-Open Patent Publication No. 2002-339997 Japanese National Fair No. 4-29130

By the way, in the bearing of the above-mentioned Patent Document 1, since the seal case is not fixed to the outer ring in the axial direction, bearing pressing is required on both axial sides of the bearing. For this reason, there was a problem that it was difficult to use at the free side position. In addition, since the bearing retainer is used, it is difficult to move the bearing in the axial direction. For example, it is difficult to use the device in which the shaft expands and contracts due to thermal expansion, such as a conveyor or a vibrating screen used in mining equipment. There was a problem of being.

Also, in order to confirm the mounting state of the bearing, it is necessary to measure the bearing clearance by inserting a thickness gauge or the like into the gap between the outer ring raceway surfaces. However, the bearing of Patent Document 2 has a problem that it is difficult to measure the bearing clearance because it is difficult to remove the oil seal after mounting. Similarly, there has been a problem that maintenance such as confirmation of a bearing state in use and addition of grease is difficult.

The present invention has been made in view of the above circumstances, and can improve the maintainability and can be used at a position where the bearing needs to be movable in the axial direction or at a free side position. An object of the present invention is to provide a rolling bearing with a sealing device.

The above object of the present invention can be achieved by the following constitution.
(1) an outer ring having a raceway surface on the inner peripheral surface;
An inner ring having a raceway surface on the outer peripheral surface;
A plurality of rollers provided in a freely rollable manner between the raceways of the outer ring and the inner ring;
A rolling bearing with a sealing device comprising: a seal holder fixed to an axial end of the inner ring or the outer ring; and a sealing device having a seal attached to the seal holder,
The seal holder has a fixing member hole in the axial direction, and the seal holder is fixed to the axial end of the inner ring or the outer ring by a fixing member through the fixing member hole. Rolling bearing with sealing device.
(2) The fixing member hole is a bolt insertion hole, and the fixing member is a bolt.
The rolling bearing with a sealing device according to (1), wherein the seal holder is fastened and fixed to an axial end portion of the inner ring or the outer ring by the bolt inserted through the bolt insertion hole.
(3) The outer member constituted by the outer ring, a pair of the seal holders fixed to both axial ends of the outer ring, and the inner member constituted by the inner ring have the same axial width. The rolling bearing with a sealing device according to (1) or (2), wherein the rolling bearing has a size.
(4) The inner member constituted by the outer member constituted by the outer ring, the inner ring, and the pair of seal holders fixed to both axial ends of the inner ring have the same axial width. The rolling bearing with a sealing device according to (1) or (2), wherein the rolling bearing has a size.
(5) The rolling bearing with a sealing device according to any one of (1) to (4), wherein an O-ring is provided between the axially facing end surfaces of the outer ring and the seal holder.
(6) The rolling bearing is a self-aligning rolling bearing,
The raceway surface of the outer ring is provided as a spherical concave surface having a single center on the inner peripheral surface of the outer ring,
The inner ring raceway surface is provided in two rows on the outer circumferential surface of the inner ring so as to face the outer ring raceway surface,
The sealing device according to any one of (1) to (5), wherein the plurality of rollers are spherical rollers provided in two rows so as to be freely rollable between the raceway surfaces of the inner ring and the outer ring. Rolling bearing with.

According to the rolling bearing with a sealing device of the present invention, it is possible to improve the maintainability, and it is possible to use the bearing at a position where it is necessary to be able to move in the axial direction or at a free side position.

It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on 1st Embodiment of this invention. It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on 2nd Embodiment of this invention. It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on the modification of 2nd Embodiment. It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on the other modification of 2nd Embodiment. It is sectional drawing of the self-aligning roller bearing with a sealing device which concerns on 3rd Embodiment of this invention.

Hereinafter, a rolling bearing with a close contact device according to each embodiment of the present invention will be described with reference to FIGS.

(First embodiment)
Hereinafter, a rolling bearing with a close contact device according to a first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, the self-aligning roller bearing 100 according to the first embodiment has, for example, an outer diameter of 540 mm, an inner diameter of 320 mm, and a width of 176 m, and a spherical roller is interposed between the inner ring 11 and the outer ring 12. A plurality of 13 and 13 are arranged in two rows. The spherical rollers 13 in each row are held at a constant circumferential interval by an integrated machined cage (hereinafter also simply referred to as a cage) 16.

The inner ring 11 is provided with two rows of

raceway grooves

11a and 11a on the outer peripheral surface 11c, and

raceway surfaces

11b and 11b are formed at the groove bottoms of these

raceway grooves

11a and 11a. An inner peripheral surface 11f of the inner ring 11 is formed in a tapered shape.

The outer ring 12 has a raceway surface 12 a which is a spherical concave surface on the inner peripheral surface, and the center of curvature of the raceway surface 12 a coincides with the center of the self-aligning roller bearing 10. Mind is secured. At an intermediate position in the width direction of the outer ring 12, an injection hole 12b for injecting a lubricant such as grease is formed in at least one place in the circumferential direction so as to penetrate the outer ring 12.

The spherical rollers 13 arranged in each row have a barrel-shaped rolling surface 13a and roll between the raceway surface 11b of the inner ring 11 and the raceway surface 12a of the outer ring 12.

The cage 16 is a machined cage that is made of metal and manufactured by shaving, and is used for outer ring guidance. The retainer 16 includes an annular ring-shaped body 16a extending along the circumferential direction at the center between the

raceway surfaces

11b, 11b, and 12a, and axially spaced from each other on both sides of the ring-shaped body 16a. And a plurality of

column portions

16b, 16b provided so as to protrude. A plurality of pockets are formed along the circumferential direction of the cage 16 by the axial side surface of the annular body 16 a and the

adjacent column portions

16 b and 16 b. Each pocket of the cage 16 is formed so as to be shifted by a half pitch in the circumferential direction between the roller rows. The cage 16 configured in this way forms the respective roller rows on both sides of the annular body 16a by independently accommodating the respective rows of spherical rollers 13 in the respective pockets, and each spherical surface of each roller row. The rollers 13 are held so as to be freely rollable at regular intervals along the circumferential direction. Further, the spherical rollers 13 in each row are arranged alternately with the annular body 16a interposed therebetween.

The sealing device 20 includes: a seal holder 21 fixed to the axial end surface 12d of the outer ring 12; and a seal 26 covering a cored bar 25 press-fitted into an annular groove 24 formed on the inner peripheral side of the seal holder 21. It is configured. The core metal 25 has a substantially L-shaped cross section and has a substantially cylindrical shape extending inward in the radial direction. Further, the outer diameter side end portion of the cored bar 25 extends radially outward so as to be sandwiched between the seal holder 21 and the axial end surface 12 d of the outer ring 12 by the annular groove 24. The seal 26 is formed of an elastic body such as rubber, and similarly extends radially inward along the cored bar 25. The seal 26 is reinforced by a ring 29 at a waist portion bent inward in the axial direction in the vicinity of the outer peripheral surface 11c of the inner ring 11, and has a lip portion 28 bent outward in the axial direction at an end portion on the radially inner side. A tightening spring 27 is fitted on the outer peripheral side of the lip portion 28. The lip portion 28 is in sliding contact with the outer peripheral surface 11c of the inner ring 11, so that the bearing space is sealed, so that liquid and foreign matter can be prevented from entering from the outside, and the lubricant enclosed in the bearing space can be prevented from flowing out. Can do.

Here, the seal holder 21 is formed with a plurality of bolt insertion holes 22 provided at substantially equal intervals in the circumferential direction, and the outer ring 12 is formed with a plurality of bolt holes 12e opened in the axial end surface 12d. ing. The seal holder 21 is fastened and fixed to the outer ring 12 by inserting and screwing the bolts 23 into the bolt insertion holes 22 and the bolt holes 12e. With this configuration, the seal holder 21 is firmly fixed in the axial direction to the outer ring 12 and thus to the self-aligning roller bearing 100, so that it is not necessary to use a bearing retainer. As a result, the structure can be simplified, and the self-aligning roller bearing 100 can be used while maintaining the sealing performance even at the free side position of the device or at a position where the bearing needs to be movable in the axial direction. It becomes. In addition, since the head of the bolt 23 is embedded in the seal holder 21 and does not protrude from the outer end surface in the axial direction of the seal holder 21, there is no need for a separate process for releasing the head of the bolt 23 in the housing. A similar housing structure can be employed.
Note that the axial end surface 12d of the outer ring 12 and the end surface of the seal holder 21 facing the axial end surface 12d are formed in steps on the radially outer side of the position where the bolt 23 is inserted. This step is used to align the sealing device 20 with the bearing. In particular, when the fitting of the outer ring 12 is a clearance fit, the seal holder 21 may not be arranged concentrically with the outer ring 12, and as a result, the seal pressing force is not maintained in a certain range in the circumferential direction, and the sealing performance is improved. May be reduced. For this reason, the sealing performance can be ensured by arranging the seal holder 21 and the outer ring 12 concentrically by the step.

Further, as described above, the inner peripheral surface 11f of the inner ring 11 is formed in a tapered shape. However, if the amount of axial bearing pressing is large, the inner ring 11 expands and the bearing clearance decreases. According to the self-aligning self-aligning roller bearing 100 of the present embodiment, the sealing device 20 can be easily removed by removing the bolts 23. Therefore, the bearing clearance is measured for the purpose of confirming the mounting state of the bearing before use. It becomes possible. By pushing the bearing in the axial direction so that the measured value of the bearing clearance is an appropriate value, it is possible to install the bearing properly and to improve the maintainability.

Further, according to the sealed spherical roller bearing 100 of the present embodiment, the sealing device 20 can be easily removed by removing the bolt 23. Therefore, even during use, additional sealing of lubricant and confirmation of the bearing state can be performed. Such maintenance can be easily performed. Further, since the position of the seal 26 is fixed by fixing the seal holder 21, the sealing performance can be further improved.

Note that at least one surface layer of the inner ring 11, the outer ring 12, and the spherical roller 13 is preferably formed of a carburized or carbonitrided material having a retained austenite amount (γR vol%) of 20 to 45 vol%. . Alternatively, at least one surface layer of the inner ring 11, the outer ring 12, and the spherical roller 13 has a retained austenite amount (γR vol%) of 20 to 45 vol%, C; 0.1 to 1.2 wt%, Cr; 1 The surface hardness (Hv) of the surface layer that has been carburized or carbonitrided with Mo of 2.0% by weight or less and 1/3 or more of the Cr content. It is preferably formed from an alloy steel in the range of −4.7 × (γR vol%) + 920 ≦ Hv ≦ −4.7 × (γR vol%) + 1020 with respect to the amount of retained austenite. Alternatively, at least one surface layer of the inner ring 11, the outer ring 12, and the spherical roller 13 has a retained austenite amount (γR vol%) of 20 to 45 vol%, C; 0.1 to 1.2 wt%, Cr; 1 The surface hardness (Hv) of the surface layer that has been carburized or carbonitrided with Mo of 2.0% by weight or less and 1/3 or more of the Cr content. It is preferably formed from an alloy steel in the range of −4.7 × (γR vol%) + 920 ≦ Hv ≦ −4.7 × (γR vol%) + 1020 with respect to the amount of retained austenite. By forming the surface layer of at least one of the inner ring 11, the outer ring 12 and the spherical roller 13 with these materials, the durability of the self-aligning roller bearing 100 can be further improved and the life can be extended. Although these materials are desirably used for any of the surface layers of the inner ring 11, the outer ring 12, and the spherical roller 13, it is possible to obtain a sufficient effect even when used only in a portion that is easily damaged. For example, when the self-aligning roller bearing 100 is rotating the outer ring, these materials may be used only for the surface layer of the inner ring 11. In addition, carbon steel (for example, S25C, S45C) can be used for the seal holder 21.

In this embodiment, the outer ring 12 and the pair of seal holders 21 fixed to the both axial ends of the outer ring 12 constitute an outer member, and the inner ring 11 constitutes an inner member. The axial widths of the outer member and the inner member are designed to have the same dimensions. Thereby, it becomes easy to incorporate in a housing and a shaft, and the handleability as a rolling bearing is improved.

Thus, according to the self-aligning roller bearing 100 with the sealing device of the present embodiment, the sealing device 20 can be easily removed even after the bearing is mounted. This makes it possible to more easily perform maintenance such as checking the state of the bearing in use and adding additional grease, and to measure the bearing clearance before and during use in order to check the mounting state of the bearing. . Further, according to the self-aligning roller bearing 100 with the sealing device of the present embodiment, the bearing can be used at a position where the bearing needs to be movable in the axial direction or at a free position.

(Second Embodiment)
Hereinafter, a rolling bearing with a close contact device according to a second embodiment of the present invention will be described with reference to FIG. Parts having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 2, the self-aligning roller bearing 200 according to the second embodiment further includes an O-ring 30 between the axial end surface 12 d of the outer ring 12 and the opposing axial end surface of the seal holder 21. I have. The O-ring 30 is disposed on the radially inner side than the bolt 23. By arranging the O-ring 30 in this way, the sealing performance can be further improved, and liquid and foreign matter enter the bearing from the radially outer side of the outer ring 12 of the spherical roller bearing 200 through the bolt insertion hole 22 and the bolt hole 12e. Can be prevented.

In the first and second embodiments described above, if the tension of the seal 26 is too low, the followability of the shaft may be deteriorated. Further, the seal 26 cannot withstand the pressure of the lubricant in the bearing space, and there is a possibility that the sealing performance cannot be secured. On the other hand, if the tension of the seal 26 is too high, wear tends to occur between the lip portion 28 and the outer peripheral surface 11 c of the inner ring 11. For this reason, the tightening force of the seal 26 is preferably 10 to 100 N, and more preferably 30 to 80 N.

In FIG. 2, the annular groove 12 f that accommodates the O-ring 30 is formed on the axial end surface 12 d of the outer ring 12 that can easily secure a space. However, if the annular groove 12f is formed only on the axial end surface 12d of the outer ring 12, in the case of heavy load, there is a possibility that the generation range of stress received by the rollers from the outer ring raceway surface reaches the annular groove 12f. Therefore, as shown in FIG. 3, the O-ring 30 is disposed in the

annular grooves

12f and 21a formed on the axial end surfaces of both the outer ring 12 and the seal holder 21, and the stress does not reach the annular groove 12f. You may do it.
If the problem of space restriction can be solved, from the above viewpoint, the O-ring 30 is ideally disposed only in the annular groove 21a formed in the axial end surface of the seal holder 21, as shown in FIG. It is.

(Third embodiment)
Hereinafter, a rolling bearing with a close contact device according to a third embodiment of the present invention will be described with reference to FIG. Parts having the same configuration as in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

As shown in FIG. 5, the self-aligning roller bearing 300 according to the third embodiment includes a seal holder 41 fixed to the axial end surface 11 d of the inner ring 11, and an annular shape formed on the inner peripheral side of the seal holder 41. And a seal 46 press-fitted into the groove 44. The seal 46 is formed of an elastic body such as rubber, and has a lip portion 48 that is in sliding contact with the inner peripheral surface 12c of the outer ring 12 at the outer diameter side end portion. The lip portion 48 is in sliding contact with the inner peripheral surface 12c of the outer ring 12 to seal the bearing space, so that liquid and foreign matter can be prevented from entering from the outside, and the lubricant enclosed in the bearing space can be prevented from flowing out. be able to. According to such a configuration, since the conventional outer ring 12 can be used, the manufacturing cost can be reduced.

In the present embodiment, the inner ring 11 and the pair of seal holders 41 fixed to the both axial ends of the inner ring 11 constitute an inner member, and the outer ring 12 constitutes an outer member. In addition, the axial widths of the outer member and the inner member are designed to have the same dimensions. Thereby, it becomes easy to incorporate in a housing and a shaft, and the handleability as a rolling bearing is improved.

It should be noted that the present invention is not limited to the above-described embodiment, and can be changed or improved as appropriate. In the above-described embodiment, the inner peripheral surface 11f of the inner ring 11 is formed in a tapered shape, but the inner peripheral surface 11f may be formed in a cylindrical shape. Moreover, when it is necessary to fix the

bolts

23 and 43 more firmly, the

bolts

23 and 43 may be impregnated with an adhesive.

Further, the sealing device in the embodiment described above can be attached to both ends of a bearing other than the self-aligning roller bearing, for example, a cylindrical roller bearing, a tapered roller bearing, or a combination bearing in which two or more of the above-described bearings are combined. Are also within the scope of the present invention. Moreover, the rolling bearing with a sealing device according to the present invention can be used not only on the free side of industrial machines, for example, mining equipment machines, but also on the fixed side.
Furthermore, the configuration of the seal can be applied to any one of the outer ring and the inner ring, and can have a cored bar and an elastic body as in the first and second embodiments. Alternatively, it may be constituted by an elastic body without a cored bar.
Further, the fixing member hole of the present invention is not limited to the bolt insertion hole of the present embodiment, and the fixing member of the present invention is not limited to the bolt of the present embodiment. In other words, the fixing member may be a member for fixing the seal holder to the axial end portion of the inner ring or the outer ring through the fixing member hole.
The present invention is based on a Japanese patent application (Japanese Patent Application No. 2013-156001) filed on July 26, 2013, the contents of which are incorporated herein by reference.

11 Inner ring 12 Outer ring 13

Spherical roller

21, 41

Seal holder

23, 43 Bolt (fixing member)
26, 46

Seal

100, 200, 300 Spherical roller bearing

Claims

An outer ring having a raceway surface on the inner peripheral surface;
An inner ring having a raceway surface on the outer peripheral surface;
A plurality of rollers provided in a freely rollable manner between the raceways of the outer ring and the inner ring;
A rolling bearing with a sealing device comprising: a seal holder fixed to an axial end of the inner ring or the outer ring; and a sealing device having a seal attached to the seal holder,
The seal holder has a fixing member hole in the axial direction, and the seal holder is fixed to the axial end of the inner ring or the outer ring by a fixing member through the fixing member hole. Rolling bearing with sealing device.
The fixing member hole is a bolt insertion hole, and the fixing member is a bolt;
The rolling bearing with a sealing device according to claim 1, wherein the seal holder is fastened and fixed to an end portion in the axial direction of the inner ring or the outer ring by the bolt inserted into the bolt insertion hole.
The outer member constituted by the outer ring, a pair of the seal holders fixed to both axial ends of the outer ring, and the inner member constituted by the inner ring have the same axial width. The rolling bearing with a sealing device according to claim 1 or 2.
The outer member constituted by the outer ring, the inner ring, and the inner member constituted by the pair of seal holders fixed to the both axial ends of the inner ring have the same axial width. The rolling bearing with a sealing device according to claim 1 or 2.
The rolling bearing with a sealing device according to any one of claims 1 to 4, wherein an O-ring is provided between axial end faces of the outer ring and the seal holder facing each other.
The rolling bearing is a self-aligning rolling bearing;
The raceway surface of the outer ring is provided as a spherical concave surface having a single center on the inner peripheral surface of the outer ring,
The inner ring raceway surface is provided in two rows on the outer circumferential surface of the inner ring so as to face the outer ring raceway surface,
The sealing device according to any one of claims 1 to 5, wherein the plurality of rollers are spherical rollers provided in two rows so as to freely roll between the raceway surfaces of the inner ring and the outer ring. Rolling bearing with.