WO2019240059A1

WO2019240059A1 - Self-aligning roller bearing

Info

Publication number: WO2019240059A1
Application number: PCT/JP2019/022864
Authority: WO
Inventors: 幹隆佐波
Original assignee: Ntn株式会社
Priority date: 2018-06-14
Filing date: 2019-06-10
Publication date: 2019-12-19
Also published as: JP2019215058A

Abstract

The present invention addresses the problem of improving the assemblability of a bearing in a manner such that, by using a cage-shaped retainer (40) formed of a metal plate, an assembly of an inner ring (10), a plurality of rollers (30), and the retainer (40) can be inserted inside an outer ring (20). A foreign substance is prevented from entering by means of a flange (44) of the retainer (40) and a protruding section (51) of an annular shield plate (50) that is to be attached to the flange (44). Attachment accuracy of the shield plate (50) is improved by bringing a rear surface (52) of the shield plate (50) and the flange (44) into complete contact along the circumferences. A feeler gauge is made insertable between a spherical raceway (21) and the roller (30) by making the protruding section (51) have a smaller diameter than an imaginary spherical surface (S) including the spherical raceway (21).

Description

Spherical roller bearing

This invention relates to a self-aligning roller bearing.

Self-aligning roller bearings are a type of roller bearing that mainly receives a radial load, have a predetermined alignment property, and are used in industrial machines that support relatively large loads.

In general, a spherical roller bearing includes an inner ring having two rows of raceways, an outer ring having a spherical raceway, two rows of rollers interposed between the inner race and the outer race, and a cage that holds the rollers. Prepare.

Conventionally, self-aligning roller bearings having a seal press-fitted into the inner peripheral end of the outer ring have been used in places where there are many foreign objects (for example, Patent Document 1). This seal is press-fitted into the outer ring in a state where the bearing assembly is completed after all of the two rows of rollers have been arranged between the inner ring and the outer ring, but at that time, the seal must not be deformed into distortion. In order to avoid the troublesomeness, there is also a self-aligning roller bearing in which a seal can be attached to and detached from a cage in a state where the bearing assembly is completed (Patent Document 2).

A self-aligning roller bearing disclosed in Patent Document 2 includes an inner ring having flanges at both ends of the outer periphery, and a comb-shaped cage that holds two rows of rollers, and a plurality of comb teeth formed on the cage. The tip end surface of the columnar column and the seal are fastened with a plurality of screw members.

Japanese Patent Application Laid-Open No. 11-342459 JP 2007-198540 A

¡To properly use a spherical roller bearing, it is important to measure the internal clearance of the spherical roller bearing in a use state where the shaft supports the shaft. The internal clearance of the bearing can be measured by inserting a clearance gauge between the spherical raceways of the outer ring.

However, since the self-aligning roller bearing of Patent Document 1 includes a seal that is press-fitted into the inner peripheral end of the outer ring, a clearance gauge cannot be inserted between the spherical raceways of the outer ring when in use. It is conceivable to attach the seal to the outer ring after measuring the internal clearance of the bearing. However, the seal is press-fitted into the outer ring in a state of use arranged between the shaft and the housing, and the work is difficult.

On the other hand, since the self-aligning roller bearing of Patent Document 2 employs a mounting structure in which the seal and the cage are fastened with a screw member, the clearance gauge is placed between the spherical raceway of the outer ring with the seal separated from the cage. After inserting and measuring the internal clearance of the bearing, it is possible to screw the seal and cage.

However, since the self-aligning roller bearing of Patent Document 2 includes a comb-shaped cage, the rollers in each row are held in a state where the inner ring and the cage intersect each other by 90 ° with respect to the outer ring when the bearing is assembled. It is necessary to insert it into the vessel, and the assembling property of the bearing is deteriorated. Moreover, since it is the attachment structure which fastens a seal | sticker to the front end surface of a several comb-shaped pillar part with a screw member, the contact area of a holder | retainer and a seal is limited, and there exists anxiety in the attachment accuracy of a seal | sticker. Further, a plurality of screw members are required, and the number of parts increases.

In view of the above-mentioned background, the problem to be solved by the present invention is to improve the assemblability of the self-aligning roller bearing, and to prevent foreign matter from entering the bearing by the annular member attached to the cage. It is to improve the mounting accuracy of the bearing and to measure the internal clearance of the bearing.

To achieve the above object, the present invention provides an inner ring having two rows of raceways, an outer race having a spherical raceway, two rows of rollers interposed between the inner race and the outer race, and a holding for holding the rollers. A self-aligning roller bearing comprising a cage, further comprising an annular shield plate attached to the cage, wherein the cage is positioned on the center side of the inner ring with respect to the roller; and From the metal plate which integrally has the 2nd annular part located in the opposite side to the 1st annular part to the roller concerned, and a plurality of pillar parts which divide between the 1st annular part and the 2nd annular part. The roller is accommodated between columns adjacent to each other in the circumferential direction, and the second annular portion has a flange protruding toward the inner ring side from the column over the entire circumference in the circumferential direction, The shield plate is attached to the second annular portion, and the shield plate A metal plate having a projecting portion facing the gap between the second annular portion and the outer ring, and a back side surface contacting the flange over the entire circumference, and the projecting portion follows the spherical track. The configuration provided with a smaller diameter than the phantom spherical surface included was adopted.

According to the above configuration, since a so-called cage-shaped cage is adopted, it is possible to prevent the rollers from dropping off between the cage and the race of the inner ring. For this reason, it becomes unnecessary to insert all the rollers in a row into the cage in a state where the inner ring and the cage intersect with the outer ring by 90 ° at the time of bearing assembly, thereby improving the assembly of the bearing. Can do. Further, when forming a flange that protrudes toward the inner ring side of the column part over the entire circumference in the second annular part of the cage, the gap between the second annular part of the cage and the inner ring is narrowed by the flange, Foreign matter intrusion from this gap can be prevented. Here, in the case of a cage made of a metal plate, it is difficult to process a flange shape that bends to the outer ring side in the second annular portion. On the other hand, when an annular shield plate is attached to the second annular portion, the shield plate as the annular member is provided with a protruding portion facing the gap between the second annular portion and the outer ring, and the gap between the shield plate and the outer ring is provided. It can be narrowed at the protruding portion, and foreign matter can be prevented from entering through this gap. Moreover, since the shield plate has a back side surface that is in contact with the flange of the second annular portion over the entire circumference, the contact area between the shield plate and the second annular portion is widened, and the accuracy of attaching the shield plate is improved. can do. In addition, since the projecting part of the shield plate is provided with a smaller diameter than the virtual spherical surface including the spherical raceway of the outer ring, the clearance gauge can be removed from the gap between the projecting part and the outer ring even when the shield plate is attached to the cage. It is possible to insert and measure the bearing internal clearance.

The front annular side surface of the retainer that overlaps the back side surface of the shield plate in the radial range extending from the extension of the central axis of the roller to the inner peripheral side of the flange, and the inner periphery of the flange It is good to have the back side surface inclined toward the side which approaches the roller toward. In this case, since the front side surface of the second annular portion and the back side surface of the shield plate overlap in a wide radial range, the back side surface of the second annular portion is widened while increasing the area in which these both surfaces make contact over the entire circumference. By inclining, the thickness of the inner peripheral side of the flange can be increased and the strength of the flange can be increased.

The shield plate has a locking portion that is hooked in the radial direction and the axial direction at an inner end portion of the flange, and the shield plate is attached to the flange by a hook between the locking portion and the inner end portion of the flange. It should be attached. In this way, since the shield plate is attached on the inner periphery of the flange, the shield plate and the flange can be brought into contact in a wide radial range, and a screw member is not used for attaching the shield plate. That's it.

In addition, the shield plate has a protrusion protruding in the axial direction from the back side surface, the flange of the retainer has a fitting opening portion that fits into the protrusion, and the shield plate It is good to be attached to the flange by fitting the projection and the fitting opening. If it does in this way, it will not be necessary to use a screw member for attachment of a shield board.

The shield plate may be bonded or welded to the flange of the cage. If it does in this way, it will not be necessary to use a screw member for attachment of a shield board.

As described above, the present invention improves the assemblability of the self-aligning roller bearing by adopting the above-described configuration, and prevents the intrusion of foreign matter into the bearing by the annular member attached to the cage. The mounting accuracy can be improved and the bearing internal clearance can be measured.

Sectional drawing which shows the self-aligning roller bearing which concerns on 1st embodiment of this invention. The figure which shows the assembly process of the self-aligning roller bearing of FIG. The figure which shows the assembly process of the continuation of FIG. The figure which shows the assembly process of the continuation of FIG. Sectional drawing which shows the example which welded the shield board of FIG. 1 to the holder | retainer Sectional drawing which shows the self-aligning roller bearing which concerns on 2nd embodiment of this invention. Sectional drawing which shows the self-aligning roller bearing which concerns on 3rd embodiment of this invention.

A self-aligning roller bearing according to a first embodiment as an example of the present invention will be described with reference to FIGS. 1 to 5 of the attached drawings.

The self-aligning roller bearing shown in FIG. 1 is disposed between an inner ring 10 having two rows of raceways 11, an outer race 20 having a spherical raceway 21, and a raceway 11 of the inner race 10 and a spherical raceway 21 of the outer race 20. Two rows of rollers 30, a pair of cages 40 that hold the rollers 30 in each row, and an annular shield plate 50 attached to the cage 40 are provided.

Hereinafter, the direction along the bearing center axis, which is the center of rotation of the spherical roller bearing, is referred to as “axial direction”. The direction perpendicular to the bearing central axis is referred to as “radial direction”. The circumferential direction around the bearing central axis is referred to as “circumferential direction”. The axial direction corresponds to the horizontal direction in FIG. 1, and the radial direction corresponds to the vertical direction in FIG.

The inner ring 10 is composed of an annular bearing part having a pair of raceways 11 in two rows on the outer peripheral side. The outer ring 20 is composed of an annular bearing component having a single-row spherical raceway 21 centered on the bearing central axis on the inner peripheral side. Of the two rows of rollers 30, the first row of rollers 30 is interposed between the first track 11 and the spherical track 21, and the second row of rollers 30 is interposed between the second track 11 and the spherical track 21. To do.

Roller 30 is a convex roller. The roller 30 has a spherical rolling surface 31. Each of the track 11 and the spherical track 21 is a curved surface that contacts the rolling surface 31 at one point. During the rotation of the bearing, the rolling surfaces 31 of the two rows of rollers 30 roll between the two rows of raceways 11 and the spherical raceway 21 so that predetermined alignment is exhibited.

Of the outer periphery of the inner ring 10, the outer peripheral end portion from the track 11 to the chamfered portion closest to the track 11 is provided with a smaller diameter than the track 11. Of the outer periphery of the inner ring 10, the outer periphery central portion located between the two rows of tracks 11 is formed in a cylindrical surface shape that is continuous with the entire circumference in the circumferential direction and extends along the axial direction. The outer diameter (maximum outer diameter) of the inner ring 10 is defined at the center of the outer periphery of the inner ring 10. The skew behavior of the roller 30 is suppressed by the abutment between the pair of cages 40. In addition, instead of abutment between cages, it is also possible to provide an inner collar on the inner ring that guides the two rows of rollers, or to arrange a collar ring separate from the inner and outer rings between the two rows of rollers. is there.

The cage 40 is composed of an annular bearing part that keeps the circumferential distance between the rollers 30 of the row of rollers 30 uniform (see also FIG. 2). The cage 40 has a so-called cage shape. That is, the retainer 40 is a first annular portion 41 positioned on the center side of the inner ring 10 with respect to the row of rollers 30 and a second annular portion positioned on the opposite side of the first annular portion 41 with respect to the row of rollers 30. It consists of the metal plate which integrally has the annular part 42 and the some pillar part 43 which divides between the 1st annular part 41 and the 2nd annular part 42. As shown in FIG. The rollers 30 are accommodated in pockets (spaces) between column portions 43 adjacent in the circumferential direction.

The column portion 43 has a circumferential end surface that can come into contact with the rolling surface 31 on the outer ring 20 side of the center axis Cr of the roller 30, and the outer ring 20 of the roller 30 is brought into contact with the circumferential end surface and the rolling surface 31. The shape can be prevented from falling off to the side.

The second annular portion 42 has a flange 44 projecting toward the inner ring 10 side from the column portion 43 over the entire circumference in the circumferential direction, and a surface along the radial direction from the extension of the central axis Cr of the roller 30 to the inner periphery of the flange 44. It has a side surface 45 and a back side surface 46 inclined toward the side approaching the roller 30 toward the inner periphery of the flange 44.

The inner periphery of the flange 44 is in a position facing the chamfered portion of the rolling surface 31 of the roller 30 in the axial direction. For this reason, the clearance between the flange 44 and the outer peripheral end of the inner ring 10 is provided to be slightly smaller than the guide clearance between the

cages

40 and 30.

The front side surface 45 of the second annular portion 42 is in a certain radial range over the entire circumference. The back side surface 46 of the second annular portion 42 defines the thickness of the flange 44 together with the front side surface 45. The inner end of the back side surface 46 is located on the inner periphery of the flange 44. The back side surface 46 has a constant inclination angle with respect to the radial direction.

The retainer 40 is guided in the radial direction by contact between the flange 44 and the outer peripheral end of the inner ring 10.

The entire cage 40 is formed by pressing a metal plate. Examples of the metal plate include a steel plate.

The shield plate 50 is attached to the flange 44. The entire shield plate 50 has an annular plate shape along the radial direction.

The shield plate 50 includes a protruding portion 51 that faces the gap g between the second annular portion 42 and the outer ring 20, and a back side surface 52 that contacts the flange 44 over the entire circumference. The gap g is a radial gap formed between the second annular portion 42 and the inner periphery of the outer ring 20.

The protrusion 51 has a center on the bearing central axis and is provided with a smaller diameter than the virtual spherical surface S including the spherical raceway 21. That is, the protruding portion 51 is arranged so as not to contact the outer ring 20 and to intersect the phantom spherical surface S.

The back side surface 52 of the shield plate 50 is formed in an annular surface shape along the radial direction. The back side surface 52 overlaps the front side surface 45 of the second annular portion 42 in the axial direction in a certain radial range over the entire circumference in the circumferential direction. A contact range in which the rear side surface 52 of the shield plate 50 and the front side surface 45 of the second annular portion 42 overlap in the axial direction extends from the extension of the central axis Cr of the roller 30 to the inner peripheral side of the flange 44 in the radial direction. The radial width L ₁ of the contact range is larger than the radial length L ₂ of the protrusion 51 and has a sufficient width to stabilize the posture of the shield plate 50.

The shield plate 50 is attached to the second annular portion 42 by bonding the back side surface 52 and the front side surface 45 of the second annular portion 42.

The entire shield plate 50 is made of resin. The shield plate may be made of a metal plate and formed by pressing.

The assembly process of the self-aligning roller bearing according to the embodiment is shown in FIGS. First, as shown in FIG. 2, the inner ring 10 and the cage 40 are arranged coaxially, and the majority of the rollers 30 in one row are accommodated between the pillar portions 43 of the cage 40, so that these rollers 30 are retained in the cage 40. To form an assembly of the inner ring 10, the retainer 40 and the multiple rollers 30. Here, among the rollers 30 in a row, several diagonally arranged rollers are not accommodated in the cage 40. For this reason, the assembly can be easily inserted into the outer ring 20 in a posture in which the central axis of the assembly is orthogonal to the central axis of the outer ring 20. In the illustrated example, the number of rollers 30 in a row is 17, but in general it is 5 or more.

Next, as shown in FIG. 3, the assembly is further rotated inside the outer ring 20, so that the above-mentioned diagonally arranged rollers can be inserted between the pillar portions 43 of the retainer 40. The entire roller 30 is held by the cage 40.

Next, as shown in FIG. 4, the outer ring 20 and the assembly are arranged coaxially, the shield plate 50 and the cage 40 are arranged coaxially, the back side surface 52 of the shield plate 50 and the front side surface 45 of the cage 40. And the shield plate 50 is attached to the cage 40.

In the case of adopting adhesion as a means for attaching the shield plate 50, an adhesive may be applied in advance to the back side surface 52 of the shield plate 50 and overlapped with the front side surface 45 of the cage 40.

Welding can also be employed as means for attaching the shield plate 50. In this case, as illustrated in FIG. 5, the shield plate 50 can be attached to the flange 44 by welding the inner periphery of the shield plate 50 to the vicinity of the inner periphery of the flange 44.

When the shield plate 50 is made of resin, the shield plate 50 can be welded by melting and solidifying only the shield plate 50 by laser welding or the like. In this welding, the physical van der Waals force that appears when molecules / particles approach each other at the interface between the shield plate 50 and the flange 44, and the molten resin enters the concave surface or gap of the metal, and then solidifies. Resin and metal are joined by the mechanical anchor effect, and the combined action of the chemical bond where the metal oxide film and the resin are molecularly and atomically joined. Various combinations of laser-weldable resin and metal can be selected. Examples of the resin include plastics such as polyamide (PA), polycarbonate (PC), and polyethylene terephthalate (PET). Examples of the metal include austenite. Stainless steel (for example, SUS304), steel (for example, SPCC), pure titanium, aluminum alloy, and the like.

The self-aligning roller bearing according to the first embodiment is as described above, and as shown in FIGS. 1 and 2, a so-called cage-shaped cage 40 is employed. It is possible to prevent the rollers 30 from falling off with the track 11 of the first. For this reason, it is not necessary to insert all of the rollers 30 in one row into the cage 40 in a state in which the inner ring 10 and the cage 40 intersect with the outer ring 20 by 90 ° when the bearing is assembled. Thereby, the self-aligning roller bearing which concerns on 1st embodiment can improve the assembly property of a bearing.

Further, in the self-aligning roller bearing according to the first embodiment, the second annular portion 42 of the cage 40 has a flange 44 that protrudes toward the inner ring 10 side from the column portion 43 over the entire circumference in the circumferential direction. The gap between the bicyclic portion 42 and the inner ring 10 can be narrowed by the flange 44, and external foreign matter can be prevented from entering the bearing through the gap.

The self-aligning roller bearing according to the first embodiment includes an annular shield plate 50 attached to the second annular portion 42 of the cage 40, and the shield plate 50 is between the second annular portion 42 and the outer ring 20. Since the protrusion 51 is opposed to the gap g, the gap between the shield plate 50 and the outer ring 20 is narrowed by the protrusion 51 while the metal plate cage 40 is provided, and foreign matter enters from the gap. Can also be prevented.

Moreover, since the self-aligning roller bearing according to the first embodiment has the back side surface 52 in which the shield plate 50 is in contact with the flange 44 of the second annular portion 42 of the cage 40 over the entire circumference, the shield plate 50, the contact area between the second annular portion 42 can be widened, and the mounting accuracy of the shield plate 50 can be improved.

Further, in the self-aligning roller bearing according to the first embodiment, since the protruding portion 51 of the shield plate 50 is provided with a smaller diameter than the virtual spherical surface S including the spherical raceway 21 of the outer ring 20, the shield plate 50 is the cage. Even in the state of use attached to 40, a clearance gauge (not shown) can be inserted from the gap between the protrusion 51 and the outer ring 20 to measure the bearing internal clearance.

Further, in the self-aligning roller bearing according to the first embodiment, the shield plate has a radial range in which the second annular portion 42 of the cage 40 extends from the extension of the central axis Cr of the roller 30 to the inner peripheral side of the flange 44. 50, the front side surface 45 that overlaps the back side surface 52 and the back side surface 46 that is inclined toward the inner periphery of the flange 44 toward the side closer to the roller 30, and thus the front side surface 45 of the second annular portion 42 and the shield plate 50. The back side surface 52 of the second annular portion 42 is inclined by the inclination of the back side surface 46 while the area where the both

surfaces

45 and 52 are in contact with each other over the entire circumference in the circumferential direction is widened. The thickness of the circumferential side can be increased and the strength of the flange 44 can be increased.

In the self-aligning roller bearing according to the first embodiment, since the shield plate 50 is bonded or welded to the flange 44 of the cage 40, it is not necessary to use a screw member for attaching the shield plate 50.

In the present invention, the attachment structure of the cage is not limited to adhesion or welding, and an attachment structure by locking the shield plate and the cage can be employed. A second embodiment as an example thereof will be described with reference to FIG. In the following, only differences from the first embodiment will be described.

The shield plate 60 of the second embodiment has a locking portion 61 that is hooked in the radial direction and the axial direction on the inner end portion 72 of the flange 71 of the cage 70. There are a plurality of locking portions 61 and inner end portions 72 of the flange 71, and these are arranged at equal intervals in the circumferential direction.

The locking portion 61 forms a part of the inner periphery of the shield plate 60 and is formed in a hook shape that bends toward the roller 30 in a cross section along the radial direction. The back side surface 62 of the shield plate 60 is continuous with the locking portion 61.

The inner end 72 of the flange 71 is a notch that forms a part of the inner periphery of the flange 71. The inner end portion 72 is recessed in the outer ring 20 side as compared with the inner peripheral portion 75 that passes between the front side surface 73 and the rear side surface 74 of the second annular portion in the axial direction and defines the minimum inner diameter of the flange 71. Has a shape. Of the inner end portion 72, the edge portion that continues to the front side surface 73 is formed in a convex shape that fits inside the locking portion 61.

The shield plate 60 is engaged with the corresponding inner end portion 72 in the radial direction and the axial direction by pushing each locking portion 61 into the corresponding inner end portion 72. The shield plate 60 is attached to the flange 71 by hooking all the locking portions 61 to the corresponding inner end portions 72. In this attached state, each locking portion 61 sandwiches the corresponding inner end 72 in the axial direction, thereby preventing the shield plate 60 and the flange 71 from being separated in the axial direction, and corresponding to each locking portion 61. Due to the radial engagement of the inner end 72, the shield plate 60 is arranged at a predetermined coaxiality with the retainer 70, and the engagement of the inner ends 72 corresponding to the respective locking portions 61 in the circumferential direction is arranged. As a result, the shield plate 60 is prevented from rotating in the circumferential direction with respect to the flange 71.

Thus, since the self-aligning roller bearing according to the second embodiment attaches the shield plate 60 using the inner periphery of the flange 71, the shield plate 60 and the flange 71 are brought into contact in a wide radial range. In addition, it is not necessary to use a screw member for attaching the shield plate 60.

In the illustrated example, the locking portions 61 are formed in a distributed manner in the circumferential direction, but the locking portions may be formed in the entire circumferential direction to simplify the inner peripheral shape of the flange. When the locking portions 61 are formed in a distributed manner as in the illustrated example, the locking portions 61 can be easily pushed into the flange 71, and the shield plate 60 can be prevented from being deformed.

A third embodiment as another example of the mounting structure by locking the shield plate and the cage will be described with reference to FIG.

The shield plate 80 of the third embodiment has a protrusion 82 protruding in the axial direction from the back side surface 81 of the shield plate 80. The flange 91 of the cage 90 has a fitting opening 92 that fits into the protrusion 82. There are a plurality of projecting portions 82 and fitting port portions 92, and these are arranged at equal intervals in the circumferential direction.

The projecting portion 82 has a round shaft shape. The fitting port 92 has a round hole shape that penetrates the flange 91 in the axial direction. The protruding portion 82 has an axial length that can be accommodated in the fitting opening portion 92, and does not protrude in the axial direction from the rear side surface 93 of the second annular portion.

The shield plate 80 is arranged coaxially with the retainer 90 so that each projection 82 faces the corresponding fitting port 92 in the axial direction, and the respective projections 82 are simultaneously press-fitted into the corresponding fitting port 92. Thus, the flange 91 is attached. In this attached state, the shield plate 80 and the flange 91 are prevented from being separated in the axial direction by fitting with a tightening margin between each projection 82 and the corresponding fitting opening 92, and the shield plate 80 is held in the cage. 90 and a predetermined coaxial degree, and the shield plate 80 is prevented from rotating with respect to the flange 91 in the circumferential direction.

Thus, in the self-aligning roller bearing according to the third embodiment, the shield plate 80 is attached to the flange 91 by fitting the projection 82 of the shield plate 80 and the fitting opening 92 of the flange 91. It is not necessary to use a screw member for attaching the plate 80.

In the illustrated example, the protruding portion 82 has a round shaft shape, and the fitting port portion 92 has a through hole and a round hole shape, but the shape of the protruding portion and the fitting port portion is not particularly limited. For example, the fitting port portion may be a long hole shape that is long in the circumferential direction, and the protrusion portion may be changed to an arc-shaped shaft portion that extends in the circumferential direction. Moreover, you may make a fitting port part into a non-through-hole shape. Further, the fitting port portion may have a circumferential groove shape extending in the entire circumferential direction, and the protruding portion may protrude in an annular shape.

The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. Therefore, the scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 Inner ring 11 Raceway 20 Outer ring 21 Spherical raceway 30

Roller

40, 70, 90 Cage 41 First annular part 42 Second annular part 43

Pillar parts

44, 71, 91

Flange

45, 73 Front side surfaces 46, 74 of the second annular part , 93

Back side surface

50, 60, 80 of second annular portion Shield plate 51

Protruding portion

52, 62, 81 Back side surface 61 of shield plate Locking portion 72 Inner end portion 82 Projection portion 92 Fitting port portion

Claims

An inner ring (10) having two rows of raceways (11), an outer ring (20) having a spherical raceway (21), and two rows of rollers (30) interposed between the inner race (10) and the outer race (20). And a self-aligning roller bearing comprising a retainer (40, 70, 90) for retaining the roller (30),
An annular shield plate (50, 60, 80) attached to the cage (40, 70, 90);
The cage (40, 70, 90) includes a first annular portion (41) positioned on the center side of the inner ring (10) with respect to the roller (30), and the first annular portion (41) with respect to the roller (30). A second annular part (42) located on the opposite side of the one annular part (41), and a plurality of pillar parts (43) separating the first annular part (41) and the second annular part (42) And the roller (30) is accommodated between the column parts (43) adjacent in the circumferential direction,
The second annular portion (42) has flanges (44, 71, 91) protruding from the pillar portion (43) toward the inner ring (10) over the entire circumference, and the shield plate ( 50, 60, 80) are attached to the second annular part (42),
The shield plate (50, 60, 80) has a projecting portion (51) facing the gap between the second annular portion (42) and the outer ring (20), the flange (44, 71, 91) and the periphery. A back side surface (52, 62, 81) that contacts the entire circumference of the direction, and the protrusion (51) is provided with a smaller diameter than the virtual spherical surface including the spherical orbit (21). Features spherical roller bearings.
A radial direction in which the second annular portion (42) of the retainer (40, 70, 90) extends from the extension of the central axis of the roller (30) to the inner peripheral side of the flange (44, 71, 91). The rollers face the front side surface (45, 73) overlapping the back side surface (52, 62, 81) of the shield plate (50, 60, 80) and the inner periphery of the flange (44, 71, 91). The self-aligning roller bearing according to claim 1, having a back side surface (46, 74, 93) inclined toward the side approaching (30).
The shield plate (60) has a locking portion (61) that is hooked in the radial direction and the axial direction on the inner end portion (72) of the flange (71),
The said shield board (60) is attached to the said flange (71) by the hook of the said latching | locking part (61) and the inner end part (72) of the said flange (71), The said flange (71) is attached. Spherical roller bearing.
The shield plate (80) has a protrusion (82) protruding in the axial direction from the back side surface (81), and the flange (91) of the retainer (90) is connected to the protrusion (82). Having a fitting opening (92) for fitting;
The self-aligning roller bearing according to claim 1 or 2, wherein the shield plate (80) is attached to the flange (91) by fitting the projection (82) and the fitting opening (92).
The self-aligning roller bearing according to claim 1 or 2, wherein the shield plate (50) is bonded or welded to a flange (44) of the retainer (40).