JP2016014412A - Roller bearing and method of application therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a roller bearing having a simple structure, and less number of component parts and performing efficient supply of lubricant oil to a rolling surface thereof even in an oscillating motion.SOLUTION: This invention relates to a roller bearing 1 of plural rows having an inner race 2, an inner rolling element 3, an intermediate ring 4, an outer rolling element 5 and an outer race. An outer communication passage 8 opened to a clearance 5c between a peripheral groove 7 at the outer peripheral surface of the outer race and the outer rolling element in its axial direction is provided at the outer race and a plurality of intermediate communication passages 9 opened to a clearance at the outer rolling element in its axial direction and a clearance 3c of the inner rolling element in its axial direction are arranged at the intermediate ring 4. Further, an intermediate communication passage is formed only in a range of 180° or less. There is provided such a rolling bearing as described above, and it has a lubricant oil supply passage communicating with the opening part of the outer peripheral surface, and the intermediate communicating passage of the roller bearing is arranged at an upper part above the horizontal plane so as to cause the intermediate ring to perform an oscillating motion.

Description

  The present invention relates to a double rolling bearing provided with an intermediate ring and rolling elements between inner and outer rings, and more particularly to a rolling bearing lubrication structure suitable for swinging motion.

  Conventionally, double rolling bearings have been known for wind power generation and turbine speeding up (Patent Documents 1 and 2), or for oscillating motions of link mechanisms (Patent Document 3) and printing machines (Patent Document 4). Yes. The double rolling bearing is a rolling bearing in which a rolling element such as a roller or a ball is rolled between an inner ring and an outer ring, and an intermediate ring and a rolling element are further provided to form a two-stage or double rolling bearing. Since the load range is narrow in the swinging motion part, a solid bearing such as grease is used, and forced lubrication is used in the rotating part (Patent Document 4, paragraph 0005). In addition, the rocking range is gradually moved or widened to prevent adhesion of grease or the like.

  However, management of grease and forced lubrication separately is not preferable in terms of management. In general bearings, in the case of forced lubrication, lubricating oil is supplied to the rolling element side from the shaft side or casing side. For example, lubricating oil is supplied by penetrating the inner ring from a communication path provided on the shaft side or by providing a supply port that opens from the side surface of the inner ring to the rolling element side. Further, in the case of the casing side, lubricating oil is supplied by penetrating the outer ring or by providing a supply port that opens from the side surface of the outer ring to the rolling element side.

  Therefore, in the case of a double bearing, the lubricating oil may be supplied from the casing side and supplied to the outer rolling element and the inner rolling element, respectively (for example, Patent Document 2). In the case of a double row bearing, a supply port may be provided in the gap between the axial directions of the double row rolling elements. For example, as shown in FIG. 3, with respect to the rolling element 5 outside the double row spherical roller type rolling bearing 11, an axis of the rolling element 5 having an opening at the center of the outer periphery of the outer ring 6 and outside the inner diameter of the outer ring. A communication path 8 that opens in a gap (space) 5c between directions is provided. Lubricating oil is supplied to the communication path 8 from the casing side (arrow). For the inner rolling element 3, a communication path 12 having an opening at the center of the inner periphery 2 a of the inner ring 2 and opening in the axial gap 3 c of the inner rolling element on the inner diameter of the inner ring 2 is provided. Lubricating oil is supplied to the communication path 12 from the supply path provided in the shaft through the inner ring opening (arrow).

  Moreover, in patent document 1, it is made to guide the lubricating oil supplied from an outer side to the inner bearing side through a cylindrical member.

Japanese Utility Model Publication No. 4-50436 No. 7-40099 JP-A-11-132228 JP 2001-272232 A

  However, when the supply hole is provided in the shaft, the supply of lubricating oil from the outside of the machine to the shaft becomes complicated. Further, the provision of the cylindrical member as in Patent Document 1 has a problem that the number of parts increases and the structure becomes complicated. In view of the above problems, an object of the present invention is to provide a two-stage or double rolling bearing having a simple structure and a small number of parts. Furthermore, it is to provide a rolling bearing that can efficiently supply lubricating oil to the rolling surface even in a swinging motion and can be easily processed.

  In the present invention, an inner ring having a shaft hole, an inner rolling element that rolls on the outer raceway surface of the inner ring, and the inner rolling element is sandwiched and rolled between the outer raceway surface of the inner ring. An intermediate wheel having an inner circumferential raceway surface, an outer rolling element rolling on the outer circumferential raceway surface of the intermediate wheel, and the outer rolling element sandwiching and rolling between the outer circumferential raceway surface of the intermediate wheel. In a rolling bearing having an outer ring having an outer circumferential surface and an outer ring having a plurality of rows in the axial direction, the outer ring has an outer communication path that opens in a gap between the outer circumferential surface of the outer ring and the axial direction of the outer rolling element. The intermediate wheel solves the above-mentioned problem by providing a rolling bearing having a plurality of intermediate communication passages opened in a gap between the outer rolling elements in the axial direction and a gap between the inner rolling elements in the axial direction. did.

  That is, a communication passage in the direction perpendicular to the axis is formed in the outer ring of the double row double rolling bearing, and lubricating oil is supplied from the outside to the gap between the axial directions of the double row rolling elements to lubricate the rolling surface and the like. Further, a communication passage in a direction perpendicular to the bearing (radial direction) is formed in the intermediate wheel, and lubricating oil is supplied to the rolling surface of the inner ring from the axial clearance between the rolling elements of the outer ring through the communication passage of the intermediate wheel.

  Furthermore, in a rocking bearing, it is only necessary to lubricate a portion that receives a load. Therefore, it is not necessary to supply lubricating oil to all parts. Therefore, in the invention described in claim 2, the communication passages in the direction perpendicular to the axis of the intermediate wheel are arranged so as to be biased, and the lubricating oil is supplied centering on the necessary portion.

  Furthermore, in the invention described in claim 3, the intermediate communication passage is formed only within a range of less than 180 ° when viewed from the shaft end. This is because the lubricating oil is affected by gravity, so it is sufficient to make it less than 180 °.

  According to a fourth aspect of the present invention, the outer ring outer peripheral surface has a circumferential groove, and a rolling bearing in which an outer opening of the outer communication path is opened at the circumferential groove bottom.

  In using such a rolling bearing, an intermediate shaft may be arranged according to the load. Therefore, in the invention described in claim 5, such a rolling bearing is used, a lubricating oil supply passage communicating with the opening on the outer peripheral surface is provided, and the intermediate communication passage of the rolling bearing is disposed above the horizontal plane. Thus, a method of using a rolling bearing for swinging the intermediate wheel is provided.

  In the present invention, lubricating oil is passed from the outside through the axial clearance between the outer ring of the double row double rolling bearing, the communication passage in the direction perpendicular to the bearing provided in the intermediate ring, and the rolling elements of the outer ring and the inner ring. Since it can be supplied to the moving surface, the oil supply structure is simple and the number of parts does not increase.

  Further, in the invention according to claim 2, since the communication passage in the direction perpendicular to the axis of the intermediate wheel is biased and the lubricating oil is supplied to the necessary part, the outflow from other parts is suppressed, and the lubricating oil is supplied. It effectively circulated and improved cooling and lubrication effects. In addition, since the angle is less than 180 ° when viewed from the shaft end, the waste of lubricating oil can be eliminated (claim 3). Furthermore, since the circumferential groove that opens the communication passage is provided on the outer peripheral surface of the outer ring, the processing on the casing side may be easy. Furthermore, since the intermediate communication path of the rolling bearing is arranged above the horizontal plane so that the intermediate wheel swings, the rolling bearing is a wear-resistant and long-life rolling bearing.

BRIEF DESCRIPTION OF THE DRAWINGS (a) of the rolling bearing which shows embodiment of this invention is a longitudinal cross-sectional view, (b) is the sectional view on the AA line of (a). (A) of the rolling bearing which shows other embodiment of this invention is a longitudinal cross-sectional view, (b) is the BB sectional drawing of (a). (A) of the conventional rolling bearing is a longitudinal cross-sectional view, (b) is CC sectional view taken on the line of (a).

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1A is a longitudinal sectional view of a double row spherical roller type rolling bearing showing an embodiment of the present invention, and FIG. 1B is a sectional view taken along line AA of FIG. As shown in FIG. 1, the rolling bearing 1 is a double rolling bearing including an inner ring 2, an inner spherical roller (inner rolling element) 3, an intermediate ring 4, an outer spherical roller (outer rolling element) 5, and an outer ring 6. . As shown in FIG. 1A, the inner ring 2 is provided with a shaft hole 2a into which a shaft is inserted, and two outer peripheral raceway surfaces 2b and 2b having a concave arc-shaped cross section on the outer periphery of the inner ring. A barrel-shaped spherical roller 3 rolls on the outer raceway surface 2b. The spherical roller 3 has an outer diameter 3a that is the same circle as seen in the axial cross section. Along the outer diameter 3a, the inner circumference of the intermediate wheel 4 is formed on an arc to form an inner circumference raceway surface 4a. The inner spherical roller 3 is nipped and rotated between the inner ring 2 and the intermediate ring 4. The inner spherical roller 3 can be rotated in the axial direction and in a direction perpendicular to the axis with respect to the intermediate wheel 4 to form a so-called spherical bearing. Such spherical bearings are well known and will not be described.

  Two rows of outer peripheral raceway surfaces 4 b and 4 b having a concave arc-shaped cross section are provided on the outer periphery of the intermediate wheel 4. The barrel-shaped outer spherical roller 5 rolls on the outer peripheral raceway surface 4b of the intermediate wheel. The outer spherical roller 5 has an outer diameter 5a that is a concentric circle when viewed in the axial cross section. An inner circumference 6a of the outer ring 6 is formed on an arc along the outer diameter 5a, and the outer spherical roller 5 is sandwiched and rotated between the intermediate ring 4 and the outer ring 6. Similar to the inner ring and the intermediate ring described above, the intermediate ring 4 and the outer ring 6 constitute a spherical bearing.

  A circumferential groove 7 having a concave cross section is provided on the outer peripheral surface 6 b of the outer ring 6. As shown in FIG. 1B, there are a plurality of outer communication passages 8 that are opened at the bottom of the circumferential groove and open into the gap 5c between the axial directions of the outer spherical rollers 5, and are divided into six equal parts in the figure. Yes. Further, the intermediate wheel 4 has a plurality of intermediate communication passages 9 that are opened in the gap 5c between the outer spherical rollers 5 in the axial direction and the gap 3c between the inner spherical rollers 3 in the axial direction. It is dawned. Further, the inner and outer spherical rollers 3 and 5 are held by a retainer (not shown) so that the pitch and position are constant.

  In such a rolling bearing 1, lubricating oil (arrow) (not shown) is supplied to the circumferential groove 7, passes through the circumferential groove and the outer communication path 8, and reaches the gap 5b between the axial directions of the outer spherical rollers 5, Lubricate the outer spherical roller 5. Further, the lubricating oil (arrow) reaches the gap 3b between the axial directions of the inner spherical roller 3 from the gap 5b between the outer spherical rollers 5 in the axial direction, passes through the intermediate communication passage 9, and lubricates the inner and outer spherical rollers 5. . The lubricating oil inflow path may be single, and the communication path only needs to be processed into an outer ring and an intermediate ring, and no additional parts are required. Also, the structure is simple.

  The supplied lubricating oil lubricates the spherical rollers, and then is discharged from the rolling bearing and returned to the lubrication source through the casing and the like. Lubricating oil supplied to the outer spherical roller 5 is subjected to resistance by the spherical roller, the cage, the gap for attachment, a seal, and the like, and is sufficient for the inner spherical roller 3 through the intermediate communication path 9. An amount of lubricating oil can be supplied.

  Next, another embodiment of the present invention will be described with reference to the drawings. 2A is a longitudinal sectional view of a double row spherical roller type rolling bearing showing another embodiment of the present invention, and FIG. 2B is a sectional view taken along the line BB of FIG. 2A. The double-row spherical roller type rolling bearing of another embodiment is suitable for a rocking bearing that performs rocking motion. In addition, about the part similar to the above-mentioned, the same code | symbol is attached | subjected and a part or all of description is abbreviate | omitted. As shown in FIG. 2, the rolling bearing 1 ′ is a double rolling bearing including an inner ring 2, an inner spherical roller 3, an intermediate ring 4 ′, an outer spherical roller 5, and an outer ring 6.

  In the other embodiment, the intermediate communication path 9 'provided in the intermediate ring 4' is formed only within a range of less than 180 ° when viewed from the shaft end. In the figure, five intermediate communication passages 9 'are opened every 30 ° upward 30 ° from the horizontal. In use, when a load is applied to the shaft from above, the load is applied to the upper side of the bearing. The intermediate communication path faces the upper side.

  As described above, the lubricating oil (arrow) supplied to the outer spherical roller 5 is subjected to resistance by the outer spherical roller, the cage, the gap for mounting, the seal, and the like, and therefore passes through the intermediate communication path 9 '. The inner spherical roller 3 is supplied. Since the intermediate communication passage 9 ′ is opened above the axis, most of the lubricating oil is supplied to the inner spherical roller 3 side after passing through the upper portion. Most of the lubricating oil is concentrated and supplied to the upper part, so that it is supplied to the portion that needs the most lubrication in the swing motion. Therefore, the lubricity is improved, the cooling effect is also effective, the unnecessary waste of the lubricating oil to the lower part is reduced, and the bearing life can be extended. Further, effective lubrication can be obtained while reducing the number of intermediate communication passages 9 '.

  In the embodiment, the case of the spherical roller bearing has been described. However, the present invention is not limited to the spherical surface but can be applied to a ball, a cone, a cylindrical roller bearing, or the like. The same applies to not only triple or more rows but also multiple rows of 3 rows or more. Needless to say, the inner and outer rings are not concentric and can also be applied to an eccentric bearing for a printing press as disclosed in Patent Document 4.

1, 1 ′ Rolling bearing 2 Inner ring 2a Shaft hole 2b Outer raceway surface of inner ring 3 Inner rolling element (inner spherical roller)
3c Clearance between axial direction of outer rolling elements 4, 4 'Intermediate wheel 4a Inner raceway surface 4b Outer raceway surface of intermediate wheel 5 Outer rolling element (outer spherical roller)
5c Clearance between the axial direction of the outer rolling elements 6 Outer ring 6a Outer inner circumferential raceway surface 6b Outer ring outer circumferential surface 7 Circumferential groove 8 Outer communication path 9, 9 'Intermediate communication path

Claims (5)

An inner ring having a shaft hole, an inner rolling element that rolls on the outer raceway surface of the inner ring, and an inner raceway surface that is configured to sandwich and roll the inner rolling element between the outer raceway surface of the inner ring. An outer ring that rolls on the outer raceway surface of the intermediate wheel, and an outer inner raceway surface that is configured to sandwich and roll the outer rolling member between the outer raceway surface of the intermediate wheel. A rolling bearing having a plurality of rows in the axial direction,
The outer ring has an outer communication path that opens in a gap between the outer peripheral surface of the outer ring and the axial direction of the outer rolling element,
The rolling bearing according to claim 1, wherein the intermediate wheel has a plurality of intermediate communication passages opened in a gap between the outer rolling elements in the axial direction and a gap between the inner rolling elements in the axial direction.   The rolling bearing according to claim 1, wherein the intermediate communication path is disposed by biasing a communication path in a direction perpendicular to the axis of the intermediate wheel.   The rolling bearing according to claim 1, wherein the intermediate communication path is formed only within a range of less than 180 ° when viewed from the shaft end.   The rolling bearing according to any one of claims 1 to 3, wherein an outer peripheral surface of the outer ring has a circumferential groove, and an outer opening of the outer communication path opens at a bottom of the circumferential groove. .   5. The rolling bearing according to claim 1, wherein a lubricating oil supply passage communicating with the opening of the outer peripheral surface is provided, and the intermediate communication passage of the rolling bearing is disposed above the horizontal plane. A method of using a rolling bearing, wherein the intermediate wheel is caused to swing.

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