JP2015098917A - Rolling bearing with sealing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rolling bearing with a sealing device capable of improving maintainability and usable at a position where the bearing needs to be movable in the axial direction or at a free-side position.SOLUTION: A self-aligning roller bearing 1 with a sealing device includes a fastening ring 50 having an annular part 51, and a pair of protruded parts 52 protruded from both axial sides of the annular part 51 to the radial inside. In the outer peripheral face of a seal holder 21, a holder groove part 21b is recessed, and in an outer peripheral face 12e of an outer ring 12, an outer ring groove part 12h is recessed. The pair of protruded parts 52 of the fastening ring 50 are inserted into the holder groove part 21b and the outer ring groove part 12h to fix the seal holder 21 and the outer ring 12.

Description

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

  Machines such as conveyors used in mining equipment are 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, there has been proposed a bearing capable of preventing water and foreign matters from both ends by fixing oil seals to seal cases at both ends of an outer ring (see, for example, Patent Document 1). ).

  Further, 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 provided with a seal, there has been proposed a bearing capable of preventing water and foreign matters from both ends by an oil seal mounted by fitting a cored bar to both ends of the outer ring. (For example, refer to Patent Document 2).

JP 2002-339997 A Japanese Utility Model Publication No. 4-29130

  By the way, in the bearing of the said patent document 1, since the seal case is not fixed to the outer ring | wheel in the axial direction, the bearing holding | suppressing is needed on the axial direction both sides of a 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 in a 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.

  Further, 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, 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 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 sealing device having a seal holder fixed to an axial end of the outer ring, and a seal attached to the seal holder;
In a rolling bearing with a sealing device comprising:
A fastening ring having an annular portion and a pair of convex portions projecting radially inward from both axial sides of the annular portion;
A holder groove is recessed in the outer peripheral surface of the seal holder,
An outer ring groove is recessed in the outer peripheral surface of the outer ring,
A rolling bearing with a sealing device, wherein the seal holder and the outer ring are fixed by inserting the pair of convex portions of the fastening ring into the holder groove portion and the outer ring groove portion.
(2) A first step portion is formed on the outer peripheral surface of the outer ring,
The seal holder is formed with a protrusion protruding toward the outer ring in the axial direction,
The rolling bearing with a sealing device according to (1), wherein an outer peripheral surface of the first step portion and an inner peripheral surface of the protrusion are fitted.
(3) A second step portion is formed on the outer peripheral surface of the outer ring so as to be connected to the first step portion in the axial direction.
The second step portion is located radially outside the inner peripheral surface of the first step portion,
The outer ring groove is recessed in the second step,
The rolling bearing with a sealing device according to (2), wherein the holder groove portion is recessed in the outer peripheral surface of the seal holder at a position overlapping the protrusion in the axial direction.
(4) 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 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, according to any one of (1) to (3). Rolling bearing with sealing device.

  According to the rolling bearing with a sealing device of the present invention, maintainability can be improved and the bearing can be used at a position where it is necessary to be able to move in the axial direction or at a free 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 principal part sectional drawing of the self-aligning roller bearing with a sealing device which concerns on a modification.

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

(First embodiment)
Hereinafter, a rolling bearing with a sealing 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 1 according to the first embodiment has, for example, dimensions of an outer diameter of 550 mm, an inner diameter of 320 mm, and a width of 176 m, and between the inner ring 11 and the outer ring 12, A plurality of spherical rollers 13, 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. The inner peripheral surface 11f of the inner ring 11 is formed in a tapered shape.

  The outer ring 12 has a raceway surface 12a which is a spherical concave surface on the inner peripheral surface 12c, and the center of curvature of the raceway surface 12a coincides with the center of the self-aligning roller bearing 1, and Alignment is ensured. At an intermediate position in the width direction (axial 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 13 a and roll between the raceway surface 11 b of the inner ring 11 and the raceway surface 12 a of the outer ring 12.

  The cage 16 is a machined cage that is made of metal and is machined, and is used in an outer ring guide. 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 an annular seal holder 21 fixed to the axial end surface 12 d (axial end portion) of the outer ring 12 and a core metal press-fitted into an annular groove 24 formed radially inside the seal holder 21. And a seal 26 covering 25. The core metal 25 has a substantially L-shaped cross section and has a substantially cylindrical shape extending inward in the radial direction. 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 clamping spring 27 is fitted on the outer side of the lip portion 28 in the radial direction. 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, a first step portion 12 f that is recessed radially inward is formed at the axial end of the outer peripheral surface 12 e of the outer ring 12, and the outer ring 12 side in the axial direction is formed at the radially outer end of the seal holder 21. A protruding portion 21a is formed to protrude. And the seal holder 21 is fixed to the outer ring | wheel 12 because the outer peripheral surface of the 1st step part 12f and the inner peripheral surface of the protrusion 21a fit. Note that the fit between the seal holder 21 and the outer ring 12 at this time is relatively weak and is such that the seal holder 21 can be easily detached from the outer ring 12. By previously fitting the seal holder 21 into the outer ring 12 in this way, the seal holder 21 and the outer ring 12 can be easily fixed by the fastening ring 50 described later.

  Moreover, the outer peripheral surface 12e of the outer ring 12 is formed with a second step portion 12g that is recessed radially inward so as to be connected to the first step portion 12f in the axial direction. It is located radially outside of the step 12f. Accordingly, the first and second step portions 12f and 12g form a substantially staircase shape. An annular outer ring groove portion 12h is recessed in the axially intermediate portion of the second step portion 12g.

  The outer peripheral surface of the seal holder 21 has a tapered shape that inclines inward in the radial direction toward the outer ring 12 side (inward in the axial direction) in the axial direction. An annular holder groove 21b is recessed in the outer peripheral surface of the seal holder 21 at a position overlapping the protrusion 21a in the axial direction.

  The seal holder 21 and the outer ring 12 are fixed in the axial direction by the fastening ring 50. More specifically, the fastening ring 50 includes an annular ring part 51 that extends in the axial direction, and a pair of convex parts 52 that protrude radially inward from both axial ends of the annular part. And the seal holder 21 and the outer ring | wheel 12 are fixed to an axial direction by inserting a pair of convex part 52 into the holder groove part 21b and the outer ring groove part 12h from a radial direction outer side.

  At this time, in the present embodiment, the outer periphery of the outer ring 12 is positioned so that the fastening ring 50 is positioned radially inward of at least one outermost diameter portion of the outer peripheral surface 12e of the outer ring 12 and the outer peripheral surface of the seal holder 21. It is comprised so that it may be located in a radial inside rather than the outermost diameter part of the surface 12e. That is, the fastening ring 50 is installed so as not to increase the radial dimension of the self-aligning roller bearing 1.

  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 1, so that it is not necessary to use a bearing retainer. As a result, the structure can be simplified and can be used while maintaining the sealing performance of the self-aligning roller bearing 1 even at a position where the apparatus is free or where the bearing needs to be movable in the axial direction. It becomes.

  Further, as described above, the inner peripheral surface 11f of the inner ring 11 is formed in a taper shape. However, if the amount of axial bearing pressing is large, the inner ring 11 expands, resulting in a decrease in bearing clearance. However, according to the self-aligning roller bearing 1 of the present embodiment, since the sealing device 20 can be easily removed by removing the fastening ring 50, the bearing clearance is used for the purpose of confirming the mounting state of the bearing before use. Can be measured. Then, by pressing the bearing in the axial direction so that the measured value of the bearing clearance becomes an appropriate value, it is possible to perform appropriate installation and improve maintainability.

  Moreover, according to the self-aligning roller bearing 1 of the present embodiment, the sealing device 20 can be easily removed by removing the fastening ring 50. Maintenance such as confirmation 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.

  In addition, 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 is carburized or carbonitrided with Mo of 2.0 wt% or less and 1/3 or more of the Cr content. It is preferably formed from an alloy steel in a 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 is carburized or carbonitrided with Mo of 2.0 wt% or less and 1/3 or more of the Cr content. It is preferably formed from an alloy steel in a 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 1 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 1 is rotating the outer ring, these materials may be used only for the surface layer of the inner ring 11.

(Second Embodiment)
Hereinafter, a rolling bearing with a sealing 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 1 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 seal holder 21. The O-ring 30 is disposed on the radially inner side with respect to the protrusion 21 a of the seal holder 21. By arranging the O-ring 30 in this manner, the sealing performance can be further improved, and the liquid and foreign matter are bearing from the radially outer side of the outer ring 12 of the self-aligning roller bearing 1 through the first step portion 12f, the axial end surface 12d, and the like. Intrusion can be prevented. If necessary, an O-ring groove (not shown) for fixing the O-ring 30 may be provided on the axial end surface 12d of the outer ring 12 or the end surface of the seal holder 21 facing the outer ring 12.

  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 tension force of the seal 26 is preferably 10 to 100N, and more preferably 30 to 80N.

  In addition, this invention is not limited to embodiment mentioned above, A change, improvement, etc. are possible suitably.

  For example, 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.

  In the above-described embodiment, the outer ring groove portion 12h is recessed in the axially intermediate portion of the second step portion 12g. However, as shown in FIG. 3, the outer ring groove portion 12h is formed at the axially inner end portion of the second step portion 12g. It may be recessed.

  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.

1 Spherical roller bearing (rolling bearing with sealing device)
11 inner ring 11a raceway groove 11b raceway surface 11c outer circumference surface 11f inner circumference surface 12 outer ring 12a raceway surface 12b injection hole 12c inner circumference surface 12d axial end surface 12e outer circumference surface 12f first step portion 12g second step portion 12h outer ring groove portion 13 spherical roller (Rolling)
13a Rolling surface 16 Cage 16a Annular body 16b Column 20 Sealing device 21 Seal holder 21a Projection 21b Holder groove 24 Groove 25 Core metal 26 Seal 27 Clamping spring 28 Lip part 29 Ring 30 O-ring 50 Fastening ring 51 Circular ring Part 52 Convex part

Claims (4)

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 sealing device having a seal holder fixed to an axial end of the outer ring, and a seal attached to the seal holder;
In a rolling bearing with a sealing device comprising:
A fastening ring having an annular portion and a pair of convex portions projecting radially inward from both axial sides of the annular portion;
A holder groove is recessed in the outer peripheral surface of the seal holder,
An outer ring groove is recessed in the outer peripheral surface of the outer ring,
A rolling bearing with a sealing device, wherein the seal holder and the outer ring are fixed by inserting the pair of convex portions of the fastening ring into the holder groove portion and the outer ring groove portion. A first step is formed on the outer peripheral surface of the outer ring,
The seal holder is formed with a protrusion protruding toward the outer ring in the axial direction,
The rolling bearing with a sealing device according to claim 1, wherein an outer peripheral surface of the first step portion and an inner peripheral surface of the protrusion are fitted. A second step portion is formed on the outer peripheral surface of the outer ring so as to be connected to the first step portion in the axial direction.
The second step portion is located radially outside the inner peripheral surface of the first step portion,
The outer ring groove is recessed in the second step,
The rolling bearing with a sealing device according to claim 2, wherein the holder groove portion is recessed in an outer peripheral surface of the seal holder at a position overlapping the protrusion in the axial direction. 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 3, 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.

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