JP2016102525A - Self-aligning roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-aligning roller bearing excellent in fluidity of lubricant in a radial direction of a bearing, and thereby capable of suppressing heating, abrasion and vibration even when the bearing rotates at high speed.SOLUTION: A self-aligning roller bearing includes: an inner ring; an outer ring; a plurality of rolling bodies arrayed in two rows in an axial direction between the inner ring and the outer ring; and a holder having a pocket for holding the rolling bodies with a predetermined interval in a circumferential direction. The pocket of the holder is defined by an annular part and a columnar part extending from the annular part in the axial direction. In the columnar part, a radial hole penetrating in a radial direction is formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, a self-aligning roller bearing used in a rotation support portion of a general industrial machine or the like, and more particularly, to a self-aligning roller bearing used in a rotation support portion of a papermaking machine or an elevator that requires high speed.

  As a conventional self-aligning roller bearing of this type, for example, the one shown in FIG. 6 is known (see Patent Document 1). This self-aligning roller bearing 101 has two rows of spherical rollers 105 and 105 as rolling elements between an inner ring 102 having double row raceways 102a and 102a and an outer ring 103 having a double row integral concave spherical race 103a. However, it is arrange | positioned so that rolling in the circumferential direction is possible via a pair of holder | retainer 104,104. A flange 106 is provided between the double-row tracks 102a and 102a of the inner ring 102. The cages 104 and 104 are guided along the outer peripheral surface of the flange 106, and oil holes 104x and 104x penetrating in the axial direction (left and right in the figure) are formed in the bases 104a and 104a of the cages 104 and 104, respectively. Is provided.

  Generally, when the spherical roller 105 is skewed, sliding friction is generated, so that there is a concern about heat generation and influence on the lubricant (lubricant oil, grease). In order to prevent the spherical roller from skewing, the spherical roller 105 It is preferable that the clearance between the roller and the cage, and the clearance between the end surface of the spherical roller and the collar portion or the guide ring are small. However, the smaller this gap is, the more difficult it is for the lubricant to flow in, and it becomes difficult to maintain the lubrication state of the contact surface well.

  According to Patent Document 1, since the oil holes 104x and 104x are provided in the configuration of FIG. 6, the lubricating oil circulates in the axial direction through the oil holes 104x and 104x and accommodates the spherical rollers 105 and 105. The lubricating oil is smoothly circulated and stirred through the inside and outside of the pocket portion. For this reason, it is described that the stay of the lubricating oil in the pocket portion in the axial direction is suppressed, and foreign matter is prevented from accumulating in the pocket portion.

JP 2008-69868 A

  In the conventional self-aligning roller bearing 101 shown in FIG. 6, the stay of the lubricating oil in the axial direction in the pocket portion is suppressed, but the fluidity of the lubricating oil in the radial direction of the bearing is not taken into consideration. In order to improve productivity, bearings are being rotated at higher speeds. Even at such high-speed rotation, in order to mitigate abnormal heat generation due to direct contact between metal parts and surface damage such as wear of the contact surface, the fluidity of the lubricating oil in the bearing radial direction within the bearing It is necessary to take measures to improve

  In view of such problems, the present invention improves the fluidity of the lubricating oil in the radial direction of the bearing, and thereby enables self-alignment that can suppress heat generation, wear, and vibration even when the bearing rotates at a high speed. It aims at providing a roller bearing.

The above object of the present invention can be achieved by the following constitution.
(1) An inner ring, an outer ring, a plurality of rolling elements arranged in two rows in the axial direction between the inner ring and the outer ring, and a pocket for holding the rolling elements at a predetermined interval in the circumferential direction. A self-aligning roller bearing provided with a cage,
The cage pocket is defined by an annular portion and a column portion extending in the axial direction from the annular portion, and a spherical hole penetrating in the radial direction is formed in the column portion. .
(2) The spherical roller bearing according to (1), wherein a circumferential hole penetrating in the circumferential direction is formed in the column portion.

  According to the present invention, since the radial hole extending in the radial direction is formed in the column portion of the cage, the fluidity of the lubricating oil in the bearing radial direction can be improved. Thereby, even when the bearing rotates at high speed, heat generation, wear, and vibration can be suppressed. Further, by forming the radial hole, the cage can be reduced in weight, and the starting torque at the start of rotation of the bearing and the braking torque at the stop of rotation can be reduced.

It is sectional drawing explaining the self-aligning roller bearing which concerns on 1st Embodiment of this invention. It is a perspective view which takes out and shows the holder | retainer of FIG. FIG. 3 is a partially enlarged view of FIG. 2. It is a perspective view which shows the holder | retainer of 2nd Embodiment of this invention. FIG. 5 is a partially enlarged view of FIG. 4. It is sectional drawing explaining an example of the conventional self-aligning roller bearing.

  Hereinafter, embodiments of a self-aligning roller bearing according to the present invention will be described with reference to the drawings.

(First embodiment)
1 to 3 show a first embodiment. As shown in FIG. 1, spherical roller bearings 1 (hereinafter also simply referred to as “bearings”) are arranged in two rows between an inner ring 2 and an outer ring 3, and between an inner ring 2 and an outer ring 3. And a plurality of spherical rollers 5 that are rotatably held by.

  The inner ring 2 is formed with double-row raceway surfaces 2a, 2a so that the center side in the axial direction (left-right direction in FIG. 1) is convex, and the center portion in the axial direction between both raceway surfaces 2a, 2a is substantially flat. A flat top surface 2b is formed. A pair of flange portions 2c and 2c are provided at both axial end portions to prevent the spherical roller 5 from dropping out of the bearing.

  The outer ring 3 has a concave spherical track surface 3a formed on the inner peripheral surface. In addition, a lubricant injection hole 3b is formed through the central portion of the outer peripheral surface in the axial direction, and the lubricant is supplied into the bearing 1 from the injection hole 3b.

  Spherical rollers 5 (hereinafter also simply referred to as “rollers”) as rolling elements are respectively disposed between the raceway surface 3 a of the outer ring 3 and the raceway surfaces 2 a of the inner ring 2, and are rotatable by the cage 4. Retained.

  The cage 4 is a raceway guide type brass machined cage, and as is apparent from FIGS. 2 and 3, an annular portion 4 a disposed at a substantially central portion in the axial direction, and the annular portion 4 a And column portions 4b extending outward in the axial direction from both axial ends. A U-shaped pocket 4c is defined by each of the column portions 4b and the annular portion 4a adjacent to each other in the circumferential direction, and the spherical roller 5 is rotatably held in the pocket 4c. Each of the rows 5 of rollers 5 is independently accommodated in each pocket 4c to form each row of rollers on both sides of the annular portion 4a, and each roller 5 of each row of rollers is spaced at regular intervals along its circumferential direction. It is configured to be rotatably held with a gap therebetween.

  Further, a radial hole 4d penetrating in the radial direction is formed in the column portion 4b. However, this radial hole is preferably provided in each column part, but it does not necessarily have to be provided in all column parts. Conversely, a plurality of radial holes may be formed in one column part.

  2 and 3, the pockets 4c of the retainer 4 are formed so as to be shifted by a half pitch in the circumferential direction between the roller rows, and the spherical rollers 5 in each row are annular portions 4a. They are arranged alternately (in a zigzag pattern).

  The guide wheel 6 is provided between the two rows of spherical rollers 5 and 5 in the axial direction and between the top surface 2b of the inner ring 2 and the annular portion 4a of the cage 4 in the radial direction. The guide wheel 6 has a pair of side surfaces 6 a and 6 a facing the two rows of spherical rollers 5, an outer peripheral surface 6 b facing the cage 4, and an inner peripheral surface 6 c facing the inner ring 2. It is guided by the surface 2b and is rotatable. Further, the cage 4 is guided on the outer peripheral surface 6b.

  Next, the operation will be described.

  The self-aligning roller bearing 1 of the present embodiment is used with an inner ring 2 attached to a shaft (not shown) that supports, for example, a paper roll, and an outer ring 3 attached to a housing (not shown). When the inner ring 2 rotates together with the shaft, the spherical roller 5 rolls between the inner ring raceway surface 2a and the outer ring raceway surface 3a.

  At this time, the lubricating oil supplied into the bearing 1 from the lubricant injection hole 3b of the outer ring 3 is guided between the cage 4 and the spherical roller 5, between the spherical roller 5, the inner ring raceway surface 2a and the outer ring raceway surface 3a. Supplied between the ring 6 and the inner ring top surface 2b and between the guide wheel 6 and the annular portion 4a of the cage 4, these contact surfaces are brought into a state of good lubricity. Further, during the operation of the bearing, the lubricating oil on the inner ring raceway surface 2a flows into the radial hole 4d of the cage 4 and is stored by the centrifugal force generated by the rotation of the inner ring 2, or the stored lubricating oil is discharged from the radial hole 4d. leak. As a result, the lubrication state between the spherical roller 5 and the outer ring 3 can be maintained well, and as a result, temperature rise, wear, and vibration due to heat generation can be suppressed.

  The lubricating oil that has moved to the outer ring 3 side falls due to its own weight and is brought back to the inner ring raceway surface 2a. And while lubricating between the inner ring raceway surface 2a and the spherical roller 5, and between the spherical roller 5 and the cage pocket 4c, a part flows into the radial hole 4d of the cage 4 and is stored as described above. Or the stored lubricating oil flows out from the radial hole 4d, so that the lubricating state between the spherical roller 5 and the outer ring 3 can be maintained well while circulating the lubricating oil.

  Further, by forming the radial hole 4d, the cage 4 can be reduced in weight, and the starting torque at the start of rotation of the bearing and the braking torque at the stop of rotation can be reduced.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS.

  The overall structure of the bearing is the same except for FIG. 1 and the structure of the cage 4 '. 4 is a perspective view of a cage 4 ′ similar to FIG. 2, and FIG. 5 is an enlarged view of the cage 4 ′ similar to FIG. As in the first embodiment, the retainer 4 'includes an annular portion 4a and a column portion 4b extending axially outward from the annular portion 4a, and a pocket 4c is defined by the annular portion 4a and the column portion 4b. doing. However, in the column part 4b, in addition to the radial hole 4d of the first embodiment, a circumferential hole 4e extending in the circumferential direction is formed. In addition, this circumferential direction hole does not need to be formed in all the column parts. Moreover, as demonstrated in 1st Embodiment, in the case of the pillar part in which the radial direction hole is not formed, only the circumferential direction hole extended in the circumferential direction may be formed.

  During the operation of the bearing, the lubricating oil flows into and is stored in the radial hole 4d and the circumferential hole 4e of the cage 4 ', or the stored lubricating oil flows out of the radial hole 4d and the circumferential hole 4e. While improving the fluidity, the lubrication state between the spherical roller 5 and the cage pocket 4c is favorably maintained.

In addition, this invention is not limited to embodiment mentioned above, A deformation | transformation, improvement, etc. are possible suitably. For example, the radial holes formed in the pillars may extend obliquely in the radial direction instead of extending radially in the radial direction. Further, grease may be used as the lubricant instead of the lubricating oil.

DESCRIPTION OF SYMBOLS 1 Self-aligning roller bearing 2 Inner ring 3 Outer ring 4, 4 'Cage 4a Annular part 4b Column part 4c Pocket 4d Radial direction hole 4e Circumferential direction hole 5 Spherical roller 6 Guide wheel

Claims (2)

An inner ring, an outer ring, a plurality of rolling elements arranged in two rows in the axial direction between the inner ring and the outer ring, and a cage having a pocket for holding the rolling elements at predetermined intervals in the circumferential direction; In spherical roller bearings with
The cage pocket is defined by an annular part and a pillar part extending in the axial direction from the annular part, and a radial hole penetrating in the radial direction is formed in the pillar part. Spherical roller bearings to do.   The self-aligning roller bearing according to claim 1, wherein a circumferential hole penetrating in the circumferential direction is formed in the column portion.

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