WO2016140099A1

WO2016140099A1 - Self-aligning roller bearing

Info

Publication number: WO2016140099A1
Application number: PCT/JP2016/055169
Authority: WO
Inventors: 幹隆佐波
Original assignee: Ntn株式会社
Priority date: 2015-03-02
Filing date: 2016-02-23
Publication date: 2016-09-09
Also published as: JP2016161037A

Abstract

An outer ring (2) has an inner-diameter section (6) having a diameter smaller than the outer diameter of a retainer (5), and the pillars (13) of the retainer (5) have retention sections (17) for preventing convex rollers (4) accommodated in pockets (12) from dropping. The outer diameters of the rings (10, 11) of the retainer (5) are set to be smaller than both the outer diameter of the retainer (5) and the diameter of the inner-diameter section (6) of the outer ring (2). Because of the differences in outer diameter among the rings (10, 11) and the pillars (13), the retainer (5) can be rolled from a state in which the inner diameter section (6) and the ring (10) which is in a position perpendicular to the outer ring (2) are in contact with each other only on the half-circle side, until the outer diameter of the retainer (5) is received into a spherical raceway (1).

Description

Spherical roller bearing

This invention relates to a self-aligning roller bearing.

Standard spherical roller bearings are formed with an outer ring having a spherical raceway, a double row inner ring having two single row raceways, a convex roller interposed between the spherical raceway and the single row raceway, and a pocket for accommodating the convex roller. And a retained cage. As a means for making the allowable alignment angle larger than 0.5 degrees in the self-aligning roller bearing, an outer ring having a width wider than a standard dimension defined in Japanese Industrial Standard (JIS) may be adopted. The inner diameter of the outer ring corresponds to the diameter of the circle inscribed in the edge of the spherical track. For this reason, when an outer ring wider than the standard dimension is adopted, the inner diameter of the outer ring may be smaller than the standard value, and the outer diameter of the cage may be larger.

In this case, the cage made of metal such as steel is poorly deformable, and the outer diameter of the cage cannot be accommodated inside the spherical track in a state where the outer ring and the central axis of the cage are orthogonal to each other. Therefore, an outer ring and a cage are divided in the circumferential direction and incorporated inside the spherical track (Patent Document 1 below). It is also common to employ an integral resin cage, deform the resin cage and place it inside the spherical track.

JP 2009-180307 A

However, when the outer ring and the cage are divided in the circumferential direction, there is a problem that the manufacturing cost is high. Moreover, when employ | adopting a resin holder, there exists a problem which cannot be used at high temperature.

Therefore, the problem to be solved by the present invention is that even if the inner diameter of the outer ring of the self-aligning roller bearing is smaller than the outer diameter of the cage, the outer ring and the cage can be used at a high temperature without being divided in the circumferential direction. It is to adopt a cage having excellent properties.

In order to achieve the above object, the present invention provides a self-aligning roller bearing including an outer ring having a spherical raceway, a plurality of convex rollers, and a cage that maintains a circumferential interval between the convex rollers. It consists of an integral annular part having an inner diameter part smaller than the outer diameter of the cage over the entire circumference in the circumferential direction, and the cage forms a ring over the entire circumference in the circumferential direction and a pocket together with this ring. The outer diameter of the cage is defined by the pillar, and the outer diameter of the ring is smaller than the outer diameter of the cage and the inner diameter portion of the outer ring. The outer diameter of the retainer is set inward of the spherical track from a state in which the ring of the retainer in a posture perpendicular to the outer ring and the inner diameter portion of the retainer are in contact with each other only on the half circumference side. Roll the cage until it is retracted Adopting a configuration in which the outer diameter difference is provided between urchin said ring and said posts.

According to the said structure, an outer ring | wheel and a holder | retainer are not divided structures in the circumferential direction, respectively, but consist of integral components over the circumferential direction perimeter, and are advantageous at the point of manufacturing cost rather than the thing of division manufacturing. The inner diameter portion of the outer ring is smaller than the outer diameter of the cage, and can be set to an allowable alignment angle of 0.5 ° or more. A metal cage is superior in usability at a higher temperature than a resin cage.
When the ring of the cage that is perpendicular to the outer ring is brought into contact with the inner diameter of the outer ring only on the half-circumference side, it is on the opposite side of the contact point compared to the case where the central axes of the cage and outer ring are orthogonal to each other. Then, the distance between the inner diameter portions of the cage and the outer ring is increased, and accordingly, the cage can be moved further into the spherical track. If the outer diameter of the ring is reduced, the distance can be increased. Utilizing this fact, if the outer diameter difference is provided between the ring and the pillar so that the cage can be rolled until the outer diameter of the cage is kept inside the spherical track, the outer ring and the cage are divided. Is no longer necessary.

For example, the cage includes a first press ring disposed on the center side of the width of the outer ring and a second press ring cage disposed on the end side of the width of the outer ring. It is good to be.
If it does in this way, while defining the outer diameter of a holder | retainer in the middle of the pillar which arrange | positions a fall prevention part, an inclination can be given to a pillar and a required outer diameter difference can be provided between both rings and pillars.

Moreover, it is good for the said pillar of the said holder | retainer to have the fall stop part which stops the fall of the said convex roller stored in the said pocket.
When assembling self-aligning roller bearings, place the inner ring and the cage concentrically with the outer ring after inserting convex rollers in each pocket with the outer diameter of the inner ring and cage kept inside the spherical raceway. A return process is performed. For this reason, it is calculated | required to prevent the convex roller stored in the pocket from falling with a cage. If the retaining portion for that purpose is arranged on the pillar, it is not necessary to secure a ring diameter for making the retaining portion on the ring.

More preferably, the column has a first protruding portion that receives the convex roller in a circumferential direction at a position closer to the first ring than the retaining portion, and closer to the second ring than the retaining portion. It is good to have the 2nd protrusion part which receives the said convex roller in the circumferential direction in this position.
If it does in this way, the circumferential direction clearance between columns will be set appropriately by the both protrusions by both protrusion parts, and the movement of a convex roller can be stabilized.

For example, the cage may be made of an iron-based metal. An iron-based metal cage is resistant to temperature changes and is superior in usability at a higher temperature than a resin cage.

As described above, according to the present invention, by adopting the above configuration, even when the inner diameter of the outer ring of the self-aligning roller bearing is smaller than the outer diameter of the cage, the cage is rolled to reduce the outer diameter of the cage. Since it can be inserted inward, a metal cage excellent in usability at high temperatures can be adopted without dividing the outer ring and the cage in the circumferential direction.

Sectional drawing which shows the self-aligning roller bearing which concerns on embodiment of this invention The partial enlarged plan view which shows the pocket of the holder | retainer shown in FIG. 1 from the A direction in FIG. Partial expanded sectional view which shows the circumferential direction end surface of the pillar of the holder | retainer shown in FIG. Sectional drawing which shows the interference relationship of a holder | retainer and an outer ring shown in FIG. 4 is a partially enlarged view near the pillar of the cage on the right side of FIG. The figure which shows the initial stage of the process which inserts the holder | retainer shown in FIG. 1 inside an outer ring | wheel. Figure showing the next stage from Figure 6 Figure showing the next stage from Figure 7 Enlarged view of the vicinity of the inner diameter part on the upper side in FIG.

Hereinafter, a self-aligning roller bearing according to an embodiment of the present invention will be described with reference to the accompanying drawings. As shown in FIG. 1, the self-aligning roller bearing includes an outer ring 2 having a spherical raceway 1, an inner ring 3, a plurality of convex rollers 4, and a cage 5 that maintains a circumferential interval between the convex rollers 4. Prepare. Here, the “circumferential direction” refers to a circumferential direction around the center axis of the bearing unless otherwise specified. Hereinafter, the direction along the bearing central axis is simply referred to as “axial direction”, and the direction perpendicular to the central axis is simply referred to as “radial direction”. The concepts of “large diameter” and “small diameter” relate to the size relationship in the radial direction.

The outer ring 2 is made of an integral annular part. The outer ring 2 has an inner diameter portion 6 having a smaller diameter than the outer diameter of the cage 5 over the entire circumference in the circumferential direction. The inner diameter portion 6 is an edge of the spherical track 1 and defines the inner diameter of the outer ring 2. The end 7 that defines the width of the outer ring 2 is a flat surface along the radial direction. Between the inner diameter portion 6 and the end 7 is a chamfered portion.

The inner ring 3 is a double row track ring having two tracks 8. The outer peripheral portion between the end 9 defining the width of the inner ring 3 and the track 8 close to the end 9 has an outer diameter equal to or smaller than the track 8 and has no collar.

¡The allowable alignment angle of this spherical roller bearing is set to 0.5 ° or more. The allowable alignment angle is an angle formed by the central axis of the inner ring 3 with respect to the central axis of the outer ring 2, and is defined as a limit value allowed during the bearing operation. The width of the outer ring 2 is wider than that of the standard dimension defined in JIS. Since the inner ring 3 has a standard size, the inner ring 3 is narrower than the outer ring 2. However, the inner ring 3 may be of the same width or wider than the outer ring 2.

The convex roller 4 has a generatrix rolling surface that makes point contact with the spherical track 1 in a plane including the central axis of the convex roller 4.

The cage 5 is formed of an integral metal part having a first ring 10 and a second ring 11 that extend over the entire circumference in the circumferential direction, and pillars 13 that form pockets 12 together with the

rings

10 and 11.

The first ring 10 is arranged on the center side of the width of the outer ring 2. The first ring 10 has a cylindrical shape along the axial direction. The pair of cages 5 face each other at the end faces of the first ring 10 and resist the skew of the convex rollers 4.

The second ring 11 is arranged on the end 7 side of the width of the outer ring 2. The second ring 11 defines the inner diameter of the cage 5 and has a flange shape having an inner diameter surface substantially along the axial direction. The cage 5 is guided in the radial direction by sliding contact between the inner diameter surface of the second ring 11 and the outer periphery of the inner ring 3.

2 and 3, the pillar 13 separates the pockets 12 adjacent in the circumferential direction between the first ring 10 and the second ring 11. The inner periphery of the pocket 12 has a cage shape surrounding the convex roller 4.

The cage 5 is made of an iron-based metal. Here, “iron-based metal” refers to both iron and alloys containing iron as a main component. The 1st ring 10, the 2nd ring 11, and each pillar 13 are formed by press processing with respect to a steel plate. That is, the cage 5 is a cage-type press cage.

The column 13 includes an outer diameter portion 14 formed at the center in the length direction of the column 13, a first connecting portion 15 formed between the outer diameter portion 14 and the first ring 10, and an outer diameter portion 14. And a second connecting portion 16 formed between the second rings 11. The outer diameter portion 14 includes the largest diameter portion of the column 13 and is generally tapered along the central axis of the convex roller 4. The first connecting portion 15 has a tapered shape with an inclination that gradually becomes smaller toward the first ring 10. The second connecting portion 16 has a tapered shape with an inclination that gradually becomes smaller toward the second ring 11. That is, the outer diameter D1 of the cage 5 is defined by the outer diameter portion 14 of the column 13. The outer diameter D2 of the first ring 10 is set to be smaller than the outer diameter D1 of the cage 5 and the inner diameter portion 6 of the outer ring 2. The outer diameter D3 of the second ring 11 is set to be smaller than the outer diameter D1 of the cage 5, the outer diameter D2 of the first ring 10 and the inner diameter portion 6 of the outer ring 2. The outer diameters D2 and D3 are smaller than the pitch circle diameter of the convex rollers 4.

On the other hand, on both end faces in the circumferential direction of the outer diameter portion 14 having a diameter larger than the pitch circle diameter of the convex rollers 4, drop-off portions 17 that stop the convex rollers 4 housed in the pockets 12 are formed. The circumferential interval between the pair of retaining portions 17 facing in the circumferential direction across the pocket 12 is narrower than the roller diameter of the convex roller 4. For this reason, the stopper portion 17 receives the central portion (rolling surface portion defining the roller diameter) of the convex roller 4 accommodated in the pocket 12 or the vicinity thereof and receives the convex roller from the pocket 12. 4 can be prevented from falling off.

In addition, the pillar 13 has a first protrusion 18 that receives the convex roller 4 in the circumferential direction at a position closer to the first ring 10 than the stopper 17, and a closer to the second ring 11 than the stopper 17. It has the 2nd protrusion part 19 which receives the convex roller 4 in the circumferential direction in a position. The first projecting portions 18 are formed on both end surfaces in the circumferential direction of the first connecting portion 15. The second projecting portions 19 are formed on both end surfaces in the circumferential direction of the second connecting portion 16. The first protrusion 18 defines a circumferential clearance between the first connecting portion 15 and the convex roller 4. The second protrusion 19 defines a circumferential clearance between the second connecting portion 16 and the convex roller 4. These

protrusions

18 and 19 suppress the expansion of the circumferential clearance between both end sides of the convex roller 4 and the column 13, and the circumferential clearance of the same degree as the circumferential clearance between the outer diameter portion 14 and the convex roller 4. Is stipulated. For this reason, during bearing operation, both ends of the skewed convex roller 4 are quickly received in the circumferential direction by the two

protrusions

18 and 19, and the movement of the convex roller 4 is stabilized.

FIG. 4 shows a cut surface by the plane when the central axis of the inner ring 3 and the cage 5 is coaxial and orthogonal to the central axis of the outer ring 2 on a plane passing through the center of the width of the spherical track 1. In the posture of FIG. 4, the convex roller 4 can be stored in the pocket 12 located outside the outer ring 2. At this time, the convex rollers 4 are struck to forcibly pass between the pair of stoppers 17. The cage 5 is rotated to sequentially feed the pockets 12 located outside, and the convex rollers 4 can be accommodated in all the pockets 12. Thereafter, the cage 5 and the inner ring 3 are returned to be concentric with the outer ring 2 to be assembled into the self-aligning roller bearing shown in FIG.

FIG. 5 is an enlarged view of the vicinity of the pillar 13 of the cage 5 on the right side in FIG. As is clear from these figures, the outer diameter portion 14 of the column 13 that defines the outer diameter D1 of the cage 5 is larger than the inner diameter portion 6 of the outer ring 2 that is the edge of the spherical track 1. Therefore, even if the central axis of the retainer 5 is arranged so as to be orthogonal to the central axis of the outer ring 2 on one side of the outer ring 2 and the retainer 5 is moved in the axial direction in this state, the outer diameter portion 14 and Due to the interference of the inner diameter portion 6, the outer diameter D <b> 1 of the cage 5 cannot be accommodated inside the spherical track 1. 4, when the cage 5 is projected toward the outer ring 2 in the axial direction (the central axis direction of the outer ring 2), the region where the cage 5 and the outer ring 2 overlap is perpendicular to the center axis of the cage 5. FIG. 5 shows the amount of interference Δ between the inner diameter portion 6 and the outer peripheral edge 14a (on the line BB in the figure) as an example. Here, the portion that most interferes with the inner diameter portion 6 of the outer ring 2 is the outer peripheral edge 14a on the second ring 11 side of the outer diameter portion 14 (on the line BB in the drawing). The outer peripheral edge 14b of the outer diameter portion 14 on the first ring 10 side is a location that defines the outer diameter D1, but is not the most interfering portion because of the relationship with the curvature of the spherical orbit 1.

Therefore, the outer diameter D1 of the cage 5 is changed from the state in which the first ring 10 of the cage 5 in a posture perpendicular to the outer ring 2 and the inner diameter portion 6 of the outer ring 2 are in contact only on the half circumference side to the inside of the spherical track 1. An outer diameter difference is provided between the column 13 and the first ring 10 and between the column 13 and the second ring 11 so that the cage 5 can be rolled until it is retracted. Here, “the cage 5 in a posture perpendicular to the outer ring 2” means a posture in which a plane including the central axis of the cage 5 and a plane including the central axis of the outer ring 2 are perpendicular to each other.

The case where the right cage 5 in FIG. 4 is inserted into the spherical track 1 will be described as an example. First, as shown in FIG. Only one portion of the first ring 10 on the lower side in the figure (indicated by point a in the figure) is brought into contact with the lower side of the inner diameter portion 6 of the outer ring 2 from one side in the axial direction with respect to the outer ring 2. In this contact state, the second ring 11 having an outer diameter D3 smaller than the outer diameter D2 of the first ring 10 is not in contact with the inner diameter portion 6. Also, none of the columns 13 is in contact with the spherical track 1. In this contact state, the central axis of the cage 5 is located on the lower side in the figure with respect to the central axis of the outer ring 2, and the distance between the upper side of the inner diameter portion 6 in the figure and the cage 5 is the above-mentioned assumption. Compared to the cage moving posture, it expands in the vertical direction in the figure. In FIG. 6, the cage 5 is drawn with respect to the cage 5 from the first ring 10 side as viewed in the direction along the central axis Ca of the cage 5. A spherical orbit 1 drawn with a two-dot chain line in FIG. 6 shows the shape of the spherical orbit 1 on the cut surface along the line BB in FIG. Further, a circle C drawn by a two-dot chain line in FIG. 6 indicates a pitch circle circumscribing the outer peripheral edge 14a of the outer diameter portion 14 of each column 13 in FIG.

When the cage 5 is rolled toward the spherical track 1 around the point a while maintaining the posture of the cage 5 from the contact state of FIG. 6, the column closest to the center side of the width of the outer ring 2 with respect to the point a. 13 is in contact with one part of the spherical track 1 (indicated by point b in the figure) as shown in FIG. At this time, at the point b, the two-dot chain line of the spherical track 1 and the circumferential end of the column 13 on the circle C are in contact, and the cage 5 is in contact with the outer ring 2 only at the points a and b. Yes.

Further, the cage 5 is rolled inwardly of the spherical track 1 around the point b while maintaining the posture of the cage 5 from the contact state of FIG. At this time, the circumferential end c point on the circle C of the column 13 located diagonally to the point b draws an arcuate locus L around the point b as shown in FIGS. Cage dimensions such as the outer diameter D1 of the cage 5 and the outer diameter D2 of the first ring 10 are set so that a gap g is generated between the locus L and the inner diameter portion 6, and the column 13 and the first An outer diameter difference is provided between the ring 10, the column 13, and the second ring 11. For this reason, as shown in FIG. 8, the cage 5 can be rolled until the outer diameter D <b> 1 of the cage 5 is accommodated inside the spherical track 1. In FIGS. 6 to 8, the display of the inner ring 3 is omitted. When the inner ring 3 is an integral annular part, the inner ring 3 is housed inside the spherical track 1 together with the cage 5.

This self-aligning roller bearing is as described above, and the outer diameters D2 and D3 of the first ring 10 and the second ring 11 are made larger than the outer diameter D1 of the cage 5 (the outer diameter of the column 13). By providing the outer diameter difference to make the diameter smaller, even when the inner diameter of the outer ring 2 is smaller than the outer diameter D1 of the cage 5, the cage 5 can be rolled and inserted into the inner surface of the spherical track 1. Without dividing the outer ring 2 and the cage 5 in the circumferential direction, the ferrous metal cage 5 excellent in usability at high temperatures can be employed.

In addition, since this spherical roller bearing employs a cage-type press cage (cage 5) having the first ring 10 and the second ring 11, it is for making a retaining portion on the ring. It is not necessary to secure the ring diameter, and the outer diameter D1 of the retainer 5 is defined in the middle of the pillar 13 where the retaining portion 17 is disposed, and the pillar 13 is inclined to be required between the

rings

10, 11 and the pillar 13. It is easy to provide a difference in outer diameter.

Further, this self-aligning roller bearing appropriately sets the circumferential clearance between the pillar 13 on both ends of the convex roller 4 by the first protrusion 18 and the second protrusion 19 of the pillar 13 and skews. The convex roller 4 to be received can be quickly received by the two protruding

portions

18 and 19 to stabilize the movement of the convex roller 4. The technical scope of the present invention is not limited to the above-described embodiment, but includes all modifications within the scope of the technical idea based on the description of the scope of claims.

DESCRIPTION OF SYMBOLS 1 Spherical track 2 Outer ring 3 Inner ring 4 Convex roller 5 Cage 6 Inner diameter part 10 First ring 11 Second ring 12 Pocket 13 Column 14

Outer diameter parts

14a and 14b Outer peripheral edge 15 First connection part 16 Second connection Part 17 Locking part 18 First protrusion 19 Second protrusion

Claims

In a self-aligning roller bearing including an outer ring having a spherical raceway, a plurality of convex rollers, and a cage that maintains a circumferential interval between the convex rollers,
The outer ring is composed of an integral annular part having an inner diameter portion smaller than the outer diameter of the cage over the entire circumference in the circumferential direction.
The cage is composed of an integral metal part having a ring over the entire circumference in the circumferential direction and each pillar forming a pocket together with the ring,
The outer diameter of the cage is defined by the pillar, and the outer diameter of the ring is set to be smaller than the outer diameter of the cage and the inner diameter portion of the outer ring,
The holding from the state in which the ring of the cage in a posture perpendicular to the outer ring and the inner diameter portion of the outer ring are in contact only on the semicircular side until the outer diameter of the cage is accommodated inward of the spherical track. A self-aligning roller bearing, characterized in that an outer diameter difference is provided between the ring and the column so that the roller can be rolled.
The cage is a squirrel-shaped press cage having the first ring arranged on the center side of the width of the outer ring and the second ring arranged on the end side of the width of the outer ring. The self-aligning roller bearing according to claim 1.
The self-aligning roller bearing according to claim 1 or 2, wherein the pillar of the cage has a stopper portion that stops the convex roller stored in the pocket.
The column has a first projecting portion that receives the convex roller in a circumferential direction at a position closer to the first ring than the retaining portion, and a position closer to the second ring than the retaining portion. The self-aligning roller bearing according to claim 3, further comprising a second protrusion that receives the convex roller in the circumferential direction.
The self-aligning roller bearing according to any one of claims 1 to 4, wherein the cage is made of an iron-based metal.