JP2016089914A - Self-aligning roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-aligning roller bearing capable of improving workability of flip work.SOLUTION: A circumferential side surface 44 of a column part 43 has a tip portion projecting in a circumferential direction with respect to an intermediate portion; and constitutes a slip-off prevention part 48 that prevents a spherical roller 30 held in a pocket 45 from slipping off from the picket 45 to an axial direction, by making an interval d between the tip portions of the circumferential side surfaces 44 of column parts 43 adjacent in the circumferential direction smaller than a maximum diameter D of the spherical roller 30. On the circumferential side surface 44 of the column part 43, between the slip-off prevention part 48 and the intermediate portion, formed is at least one projection part 49 regulating axial movement of the spherical roller 30.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a self-aligning roller bearing.

  Conventionally, as a self-aligning roller bearing, as shown in FIGS. 14 and 15, as shown in FIG. 14 and FIG. 15, an outer ring 10 in which an outer ring raceway 11 that is a spherical concave surface is formed on the inner peripheral surface, and a pair of inner rings that face the outer ring raceway 11. An inner ring 20 having a raceway 21 formed on its outer peripheral surface, and a spherical roller 30 provided in two rows between the outer ring raceway 11 and a pair of inner ring raceways 21 so as to be capable of rolling plurally for each row; A self-aligning roller bearing 1 is known that includes a cage 40 that holds a plurality of spherical rollers 30 in a rollable manner (see, for example, Patent Document 1).

  The retainer 40 has an annular rim portion 41 disposed between two rows of spherical rollers 30, and base ends thereof coupled to a plurality of circumferential positions on both axial side surfaces 42 of the rim portion 41. A plurality of column portions 43 having free ends as front ends, and a plurality of pockets 45 for holding the spherical rollers 30 in a freely rollable manner between the column portions 43 adjacent to each other in the circumferential direction.

  The pocket 45 is defined by the circumferential side surface 44 of a pair of adjacent column portions 43 and the axial side surface 42 of the rim portion 41. Here, a corner portion of the pocket 45, that is, a portion connecting the circumferential side surface 44 of the column portion 43 and the axial side surface 42 of the rim portion 41 is a concave curved surface 46 having an arcuate cross section. Further, in the axial side surface 42 of the rim portion 41 that defines the pocket 45, the portion facing the spherical roller 30 in the axial direction is recessed in a direction away from the spherical roller 30 toward the intermediate portion in the circumferential direction. A relief 47 is formed. The escape portion 47 is not necessarily provided, and the shape of the axial side surface 42 may be changed as appropriate.

  With reference to FIGS. 16 to 18, the cross-sectional shape of the circumferential side surface 44 of the column portion 43 on both sides in the circumferential direction of each pocket 45 is similar to the rolling surface 31 of the spherical roller 30, and the axial direction and diameter The direction is an arc shape. In other words, the circumferential side surfaces 44, 44 of the column part 43 are concave curved surfaces whose concavities and convexities are opposite to the rolling surfaces 31 of the spherical rollers 30.

The circumferential side surface 44 has different radii of curvature R _P and r _P with respect to the axial direction and the radial direction of the cage 40. The radius of curvature R _P , r _{P in} any direction is a pocket gap in which lubricating oil can be fed between the rolling surface 31 of each spherical roller 30 held in each pocket 45 and each circumferential side surface 44. Is larger than the radii of curvature R _R , r _R of the rolling surfaces 31 of the respective spherical rollers 30. The dimension t in the radial direction of each spherical roller 30 in the pocket clearance (when the central axis of each spherical roller 30 and the central axis of each pocket 45 coincide with each other) is a specification (size) of the spherical roller bearing. Depending on the case, for example, in the case of a self-aligning roller bearing incorporated in a rotation support portion such as a roll of various industrial machine devices, about 0.1 to 0.5 mm, or 0.4 to the maximum diameter of each spherical roller 30 About 2%. The radius of curvature R _P , r _{P in} each direction of the circumferential side surface 44 is smaller than the radius of curvature R _R , r _R in the corresponding direction of the rolling surface 31 of each spherical roller 30, and the dimension t of the pocket clearance is t. (R _P = R _R + t, r _P = r _R + t). Furthermore, the curvature radius _{R P} of the axial circumferential side 44 is much larger Te obtained comparing to the radius of curvature _{r P} in the radial direction _{(R P} >> _{r P),} as R P = _{R R,} approximately Similar functions can be obtained. Therefore, the radius of curvature R _{P in} the axial direction of the circumferential side surface 44 is set between R _{R to} R _R + t.

  Further, the circumferential side surface 44 of the column portion 43 has a tip portion in the axial direction protruding in the circumferential direction from the intermediate portion, and the cross-sectional shape of the tip portion is substantially flat. The distance d between the tip portions of the circumferential side surfaces 44 of the column portions 43 adjacent to each other in the circumferential direction is set smaller than the maximum diameter D of the spherical roller 30. As described above, the distal end portion of the circumferential side surface 44 constitutes a retaining portion 48 for preventing the spherical roller 30 held in the pocket 45 from coming out of the pocket 45 in the axial direction. In the drawing, the central portion in the axial direction of the spherical roller 30 where the spherical roller 30 has the maximum diameter D is indicated by a virtual line M. Further, the interval between the circumferential side surfaces 44 of the adjacent column portions 43 is also maximized at a position (intermediate portion) where the virtual line M intersects.

Japanese Patent No. 4985861

  When assembling such a self-aligning roller bearing 1, as shown in FIG. 19, first, a plurality of spherical rollers 30 held by a cage 40 are assembled to the inner ring 20 to constitute an assembly 3. Next, the assembly 3 is inserted obliquely or at a right angle on the inner peripheral side of the outer ring 10, and the assembly 3 and the outer ring 10 are arranged coaxially. Then, the assembly 3 is rotated in the circumferential direction to perform a so-called return operation that is incorporated into the outer ring 10. In FIG. 19, the direction in which the assembly 3 is rotated in the returning operation is indicated by an arrow A.

  However, in this self-aligning roller bearing 1, since the amount of movement of the spherical roller 30 from the intermediate position (position intersecting with the imaginary line M) in the pocket 45 to the tip end portion side is large, the spherical roller 30 moves from the pocket 45. I was jumping out to the outside. Therefore, during the turning operation, in the region indicated by B in FIG. 19, the axial end of the inner peripheral surface of the outer ring 10 and the spherical roller 30 may come into contact with each other, and the returning operation may not be performed smoothly. It was.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a self-aligning roller bearing capable of improving the workability of the return operation.

The above object of the present invention can be achieved by the following constitution.
(1) an outer ring having an outer ring raceway which is a spherical concave surface formed on the inner circumferential surface thereof;
An inner ring having a pair of inner ring raceways opposed to the outer ring raceway formed on the outer peripheral surface thereof;
A spherical roller divided into two rows between the outer ring raceway and the pair of inner ring raceways, and provided in a plurality of rolls for each row,
An annular rim portion disposed between two rows of the spherical rollers, and respective base end portions are coupled to a plurality of circumferential positions on both axial sides of the rim portion, and the tip portion is a free end. A plurality of pillars, and a plurality of pockets for freely rolling the spherical rollers between the pillars adjacent in the circumferential direction,
A self-aligning roller bearing comprising:
The axial length of the column portion is longer than ½ of the axial length of the spherical roller,
The cross-sectional shape of the circumferential side surface of the column part is an arc shape in the axial direction and the radial direction,
The circumferential side surface of the column part protrudes in the circumferential direction from the intermediate part, and the distance between the distal end parts on the circumferential side surface of the column part adjacent in the circumferential direction is determined by the spherical roller. By configuring the spherical roller smaller than the maximum diameter, the spherical roller held in the pocket constitutes a retaining portion for preventing the spherical roller from slipping out of the pocket in the axial direction,
At least one protrusion that restricts the axial movement of the spherical roller is formed between the retaining portion and the intermediate portion on a circumferential side surface of the column portion. Spherical roller bearing.
(2) On the circumferential side surface of the column part, between the retaining part and the intermediate part,
The self-aligning roller bearing according to (1), wherein two or more protrusions are formed.

  According to the self-aligning roller bearing of the present invention, at least one protrusion that restricts the axial movement of the spherical roller is formed between the retaining portion and the intermediate portion on the circumferential side surface of the column portion. Is done. Therefore, the protrusion part restricts the amount of the spherical roller that pops out from the pocket, and prevents the spherical roller and the inner peripheral surface of the outer ring from contacting each other during the returning operation. Thereby, the workability of the return operation is improved, and the handleability of the self-aligning roller bearing is improved. Further, by providing the protrusion in addition to the retaining portion, it is possible to more reliably prevent the spherical roller from slipping out of the pocket in the axial direction.

It is sectional drawing of the self-aligning roller bearing which concerns on 1st Embodiment. It is II arrow directional view in FIG. It is III-III sectional drawing in FIG. It is sectional drawing to which the column part and the spherical roller periphery were expanded. It is sectional drawing which expanded the pillar part and the spherical roller periphery further. It is the side view which looked at the pillar part from the circumferential direction. It is sectional drawing to which the column part which concerns on a modification, and a spherical roller periphery was expanded. It is sectional drawing which expanded the pillar part and spherical roller periphery which concern on 2nd Embodiment. It is sectional drawing which expanded the pillar part and spherical roller periphery which concern on 2nd Embodiment. It is sectional drawing which expanded the pillar part and spherical roller periphery which concern on 2nd Embodiment. It is the side view which looked at the pillar part concerning a 3rd embodiment from the circumference direction. It is a graph which shows the test result of the bearing outer ring temperature at the time of a driving | operation. It is sectional drawing to which the column part which concerns on a modification, and a spherical roller periphery was expanded. It is sectional drawing of the self-aligning roller bearing which concerns on a prior art. It is a XV-XV cross-sectional arrow view in FIG. It is a XVI-XVI cross-sectional arrow view in FIG. It is sectional drawing to which the column part and the spherical roller periphery were expanded. It is sectional drawing which expanded the pillar part and the spherical roller periphery further. It is a figure which shows the method of assembling a self-aligning roller bearing.

(First embodiment)
Hereinafter, a self-aligning roller bearing according to an embodiment of the present invention will be described with reference to the drawings. The self-aligning roller bearing 1A of the present embodiment has the same basic configuration as the self-aligning roller bearing 1 of FIGS.

  As shown in FIGS. 1 to 3, the self-aligning roller bearing 1 </ b> A of the present embodiment includes an outer ring 10 that has an outer ring raceway 11 that is a spherical concave surface formed on an inner peripheral surface thereof, and a pair of inner rings that face the outer ring raceway 11. An inner ring 20 having a raceway 21 formed on its outer peripheral surface, and a spherical roller 30 provided in two rows between the outer ring raceway 11 and a pair of inner ring raceways 21 so as to be capable of rolling plurally for each row; And a retainer 40 that holds the plurality of spherical rollers 30 in a rollable manner.

  The retainer 40 has an annular rim portion 41 disposed between two rows of spherical rollers 30, and base ends thereof coupled to a plurality of circumferential positions on both axial side surfaces 42 of the rim portion 41. A plurality of column portions 43 having free ends as front ends, and a plurality of pockets 45 for holding the spherical rollers 30 in a freely rollable manner between the column portions 43 adjacent to each other in the circumferential direction.

  The pocket 45 is defined by the circumferential side surface 44 of a pair of adjacent column portions 43 and the axial side surface 42 of the rim portion 41. Here, a corner portion of the pocket 45, that is, a portion connecting the circumferential side surface 44 of the column portion 43 and the axial side surface 42 of the rim portion 41 is a concave curved surface 46 having an arcuate cross section. Further, in the axial side surface 42 of the rim portion 41 that defines the pocket 45, the portion facing the spherical roller 30 in the axial direction is recessed in a direction away from the spherical roller 30 toward the intermediate portion in the circumferential direction. A relief 47 is formed. The escape portion 47 is not necessarily provided, and the shape of the axial side surface 42 may be changed as appropriate.

4 and 5, the cross-sectional shape of the circumferential side surface 44 of the column portion 43 is an arc shape in the axial direction and the radial direction so as to correspond to the shape of the rolling surface 31 of the spherical roller 30. Yes. Further, the circumferential side surface 44 of the column portion 43 has a tip portion in the axial direction protruding in the circumferential direction from the intermediate portion, and the cross-sectional shape of the tip portion is substantially flat. The distance d between the tip portions of the circumferential side surfaces 44 of the column portions 43 adjacent to each other in the circumferential direction is set smaller than the maximum diameter D of the spherical roller 30. As described above, the distal end portion of the circumferential side surface 44 constitutes a retaining portion 48 for preventing the spherical roller 30 held in the pocket 45 from coming out of the pocket 45 in the axial direction. In the drawing, the central portion in the axial direction of the spherical roller 30 where the spherical roller 30 has the maximum diameter D is indicated by a virtual line M. Further, the interval between the circumferential side surfaces 44 of the adjacent column portions 43 is also maximized at a position where the virtual line M intersects. The axial length L ₄₃ of the column part 43 is set to be longer than ½ of the axial length L ₃₀ of the spherical roller 30. If the axial length L _{43 of} the column ₄₃ is equal to or less than ½ of the axial length L ₃₀ of the spherical roller 30, the holding force of the spherical roller 30 by the pocket 45 is lost, and the The spherical roller 30 comes out.

  Furthermore, the circumferential side surface 44 of the pillar portion 43 protrudes in the circumferential direction between the retaining portion 48 and an intermediate portion intersecting with the imaginary line M (a region indicated by an arrow C in FIG. 5). One protrusion 49 is formed. As shown in FIG. 6, the protrusion 49 extends substantially perpendicular to the pitch circle diameter PCD of the spherical roller 30, and is formed from the inner peripheral surface to the outer peripheral surface of the column portion 43. By providing the projection 49 in this manner, the axial movement of the spherical roller 30 held in the pocket 45 is restricted.

  In addition, although the projection part 49 of this embodiment is formed in the vicinity of the retaining part 48, the position formed is not limited as long as it is between the retaining part 48 and the intermediate part (virtual line M). For example, you may form in the vicinity of an intermediate part (virtual line M).

  Further, the shape of the protrusion 49 is not limited to a substantially trapezoidal cross section as shown in FIGS. 4 and 5, and any shape may be applied as long as the axial movement of the spherical roller 30 can be restricted. 7 may have a substantially R-shaped cross section (a substantially semi-elliptical cross section) as shown in FIG.

  As described above, according to the self-aligning roller bearing 1A of the present embodiment, the circumferential surface 44 of the column portion 43 has a spherical surface between the retaining portion 48 and the intermediate portion (virtual line M). One protrusion 49 that restricts the axial movement of the roller 30 is formed. Therefore, the protrusion 49 restricts the amount of the spherical roller 30 that protrudes from the pocket 45, and the spherical roller 30 and the inner peripheral surface of the outer ring 10 are prevented from contacting each other in the above-described returning operation. Thereby, workability | operativity of a return operation | work is improved and the handleability of the self-aligning roller bearing 1A improves. Further, by providing the protrusion 49 in addition to the retaining portion 48, the spherical roller 30 can be more reliably prevented from slipping out of the pocket 45 in the axial direction.

(Second Embodiment)
In the self-aligning roller bearing 1 </ b> A according to the second embodiment, as shown in FIGS. 8 to 10, between the retaining portion 48 and the intermediate portion (virtual line M) on the circumferential side surface 44 of the column portion 43 ( Two or more protrusions 49 are formed in the range indicated by arrow C).

  In the example shown in FIG. 8, a protrusion 49 having a substantially R-shaped cross section and a protrusion 49 having a substantially trapezoidal cross section are formed from the retaining portion 48 side. In the example shown in FIG. 9, a protrusion 49 having a substantially trapezoidal cross section and two protrusions 49 having a substantially R-shaped cross section are formed from the retaining portion 48 side. In the example shown in FIG. 10, three protrusions 49 having a substantially R-shaped cross section are formed.

  In this way, by forming two or more protrusions 49, it is possible to more reliably prevent the spherical roller 30 from coming out of the pocket 45 and improve safety.

  Note that the number, position, shape, and the like of the protrusions 49 are not particularly limited as long as the movement of the spherical rollers 30 in the axial direction can be restricted.

(Third embodiment)
In the self-aligning roller bearing 1 </ b> A according to the third embodiment, as shown in FIG. 11, the protrusion 49 is formed near the axial end surface 50 of the column 43, as compared with the first embodiment (see FIG. 6). The Here, the protrusion 49 extends substantially perpendicular to the pitch circle diameter PCD of the spherical roller 30 and is formed from the inner peripheral surface of the column 43 to the axial end surface 50. Thereby, it is set as the structure which hardly has the projection part 49 in the outer peripheral side from pitch circle diameter PCD. Therefore, the insertion force when the spherical roller 30 passes through the protrusion 49 can be reduced.

(Example)
Whether the bearing temperature during operation is different between the self-aligning roller bearing 1 according to the prior art shown in FIGS. 14 to 19 and the self-aligning roller bearing 1A according to the first to third embodiments. Went. As the self-aligning roller bearing 1A according to the second embodiment, the one shown in FIG. 9 was used.

In the experiment, spherical roller bearings 1 and 1A having an identification number of 22326 (outer diameter = 280 mm, inner diameter = 130 mm, width = 93 mm) were used. A spherical load of 6850 kgf was applied to such self-aligning roller bearings 1 and 1A, and the operation was performed by oil bath lubrication with lubricating oil (ISO clay classification: VG32). The rotation speed of the inner ring 20 was set to 1800 min ^−1, and the temperature of the outer ring 10 after a predetermined time elapsed was measured. Note that the allowable rotational speed of the self-aligning roller bearings 1 and 1A is 1600 min ⁻¹ , and this test was performed at an operating speed exceeding the allowable rotational speed.

  As apparent from FIG. 12, the self-aligning roller bearing 1A according to the first to third embodiments has the same temperature of the outer ring 10 as compared with the self-aligning roller bearing 1 according to the prior art. Therefore, it can be said that even if the protrusion 49 that can restrict the axial movement of the spherical roller 30 is provided, the bearing performance is not affected.

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

  For example, a corner portion of the pocket 45, that is, a portion connecting the circumferential side surface 44 of the column portion 43 and the axial side surface 42 of the rim portion 41 need not necessarily be a concave curved surface 46 (see FIG. 4) having an arcuate cross section. Alternatively, as shown in FIG. 13, an R shape corresponding to the corner shape of the spherical roller 30 may be used.

DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 1A Self-aligning roller bearing 3 which concerns on a prior art 3 Assembly 10 Outer ring 11 Outer ring track 20 Inner ring 21 Inner ring track 30 Spherical roller 31 Rolling surface 40 Cage 41 Rim part 42 Axial side surface 43 Column 44 Circumferential side surface 45 Pocket 46 Concave surface 47 Relief portion 48 Retaining portion 49 Protrusion portion 50 Axial end surface

Claims (2)

An outer ring in which an outer ring raceway that is a spherical concave surface is formed on an inner circumferential surface thereof;
An inner ring having a pair of inner ring raceways opposed to the outer ring raceway formed on the outer peripheral surface thereof;
A spherical roller divided into two rows between the outer ring raceway and the pair of inner ring raceways, and provided in a plurality of rolls for each row,
An annular rim portion disposed between two rows of the spherical rollers, and respective base end portions are coupled to a plurality of circumferential positions on both axial sides of the rim portion, and the tip portion is a free end. A plurality of pillars, and a plurality of pockets for freely rolling the spherical rollers between the pillars adjacent in the circumferential direction,
A self-aligning roller bearing comprising:
The axial length of the column portion is longer than ½ of the axial length of the spherical roller,
The cross-sectional shape of the circumferential side surface of the column part is an arc shape in the axial direction and the radial direction,
The circumferential side surface of the column part protrudes in the circumferential direction from the intermediate part, and the distance between the distal end parts on the circumferential side surface of the column part adjacent in the circumferential direction is determined by the spherical roller. By configuring the spherical roller smaller than the maximum diameter, the spherical roller held in the pocket constitutes a retaining portion for preventing the spherical roller from slipping out of the pocket in the axial direction,
At least one protrusion that restricts the axial movement of the spherical roller is formed between the retaining portion and the intermediate portion on a circumferential side surface of the column portion. Spherical roller bearing. On the circumferential side surface of the column part, between the retaining part and the intermediate part,
The self-aligning roller bearing according to claim 1, wherein two or more protrusions are formed.

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