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CN-121993499-A - Rolling bearing, rotating device, and method for manufacturing rolling bearing

CN121993499ACN 121993499 ACN121993499 ACN 121993499ACN-121993499-A

Abstract

In a rolling bearing provided with a solid lubricant, an increase in rotational torque is suppressed over a long period of time. The rolling bearing (1) is provided with an inner ring (10) and an outer ring (20) which are coaxially arranged, rolling elements (30) which are arranged between the inner ring (10) and the outer ring (20), an annular retainer (40) which is arranged between the inner ring (10) and the outer ring (20) and which holds the rolling elements (30) in a manner capable of rolling, and a solid lubricant (60) which is arranged between the inner ring (10) and the outer ring (20) and which holds lubricating oil by a cured resin material. The outer ring (20) has an inner peripheral surface (22 b) that faces the inner ring (10). An inner peripheral surface (22 b) is formed with an outer ring raceway surface (23) that rotatably supports rolling elements (30), and an abutment surface (28) that extends outward in the axial direction from the end edge of the outer ring raceway surface (23) in the axial direction. The solid lubricant (60) is in contact with a recess (24) formed in the abutment surface (28).

Inventors

  • IINO AKIHIRO
  • Granite water Hui

Assignees

  • 精工电子有限公司

Dates

Publication Date
20260508
Application Date
20250924
Priority Date
20241105

Claims (18)

  1. 1. A rolling bearing is provided with: an inner ring and an outer ring coaxially arranged with each other; A rolling element disposed between the inner ring and the outer ring; An annular retainer disposed between the inner ring and the outer ring and retaining the rolling elements in a rolling manner, and A solid lubricant disposed between the inner ring and the outer ring, the solid lubricant holding lubricating oil by a cured resin material, One of the inner ring and the outer ring has a peripheral surface opposed to the other one, The peripheral surface is formed with: a raceway surface for rollably supporting the rolling elements, and An abutment surface extending outward in the axial direction from an end edge of the raceway surface in the axial direction, The solid lubricant is in contact with a recess formed in one of the abutment surface and the retainer.
  2. 2. The rolling bearing according to claim 1, wherein, The recess is formed in the abutment surface.
  3. 3. The rolling bearing according to claim 2, wherein, The solid lubricant is in contact with a portion of the concave portion facing a direction inclined outward in the axial direction with respect to the radial direction.
  4. 4. The rolling bearing according to claim 2 or claim 3, wherein, The recess has a portion oriented in a direction inclined inward in the axial direction with respect to the radial direction.
  5. 5. A rolling bearing according to claim 2 or claim 3, And a seal member attached to the inner ring or the outer ring to cover the space between the inner ring and the outer ring from the outside in the axial direction, The solid lubricant is in contact with the seal member from the inside in the axial direction.
  6. 6. The rolling bearing according to claim 2 or claim 3, wherein, The concave portions are provided at intervals in the axial direction with respect to the raceway surface.
  7. 7. A rolling bearing according to claim 2 or claim 3, And a seal member attached to the inner ring or the outer ring to cover the space between the inner ring and the outer ring from the outside in the axial direction, The one raceway ring has a protruding portion protruding toward the other raceway ring side and formed with the peripheral face, The protruding portion has an end face that faces the outside in the axial direction and is connected to the peripheral face at the peripheral edge of the other raceway ring side, The recess is provided at an interval in the axial direction with respect to the end face.
  8. 8. The rolling bearing according to claim 2 or claim 3, wherein, The recess extends continuously throughout the entirety of the circumferential direction.
  9. 9. The rolling bearing according to claim 2 or claim 3, wherein, The solid lubricant is in contact with a ridge portion formed at an end edge of the recessed portion on the raceway surface side.
  10. 10. The rolling bearing according to claim 2 or claim 3, wherein, The one raceway ring has a protruding portion protruding toward the other raceway ring side and formed with the peripheral face, The protruding portion has an end face that faces the outside in the axial direction and is connected to the peripheral face at the peripheral edge of the other raceway ring side, The peripheral surface has a connecting surface formed between the recess and the end surface, The joint surface is further away from the other raceway ring in a radial direction than an end edge of the raceway surface in the axial direction.
  11. 11. The rolling bearing according to claim 2 or claim 3, wherein, The peripheral surface has an inclined portion extending from an end edge of the concave portion on the raceway surface side toward the raceway surface side obliquely with respect to a radial direction and the axial direction.
  12. 12. The rolling bearing according to claim 11, wherein, The solid lubricant is disposed so as not to protrude from the inner side of the concave portion toward the inclined portion side in the radial direction.
  13. 13. The rolling bearing according to claim 1, wherein, The recess is formed in the retainer.
  14. 14. The rolling bearing according to claim 13, wherein, The retainer is provided with a protrusion inserted into the solid lubricant.
  15. 15. A rotating apparatus, comprising: a rotating body rotatably disposed; a support body for rotatably supporting the rotating body, and The rolling bearing according to claim 1, interposed between the rotating body and the supporting body.
  16. 16. A method for manufacturing a rolling bearing, comprising the steps of: the rolling bearing includes: an inner ring and an outer ring coaxially arranged with each other; A rolling element disposed between the inner ring and the outer ring; An annular retainer disposed between the inner ring and the outer ring and retaining the rolling elements in a rolling manner, and A solid lubricant disposed between the inner ring and the outer ring, One of the inner ring and the outer ring has a peripheral surface opposed to the other one, The peripheral surface is formed with: a raceway surface for rollably supporting the rolling elements, and An abutment surface extending outward in the axial direction from an end edge of the raceway surface in the axial direction, The solid lubricant is formed by heating a mixture of a resin material and a lubricating oil to a temperature higher than the gelation temperature of the resin material and then cooling and solidifying the mixture, The solid lubricant is brought into contact with a recess formed in the abutment surface or the retainer.
  17. 17. The method for manufacturing a rolling bearing according to claim 16, wherein, The mixture is heated to the gelation temperature or higher in a state of being in contact with the concave portion, and then cooled and solidified.
  18. 18. The method for manufacturing a rolling bearing according to claim 16, wherein, The concave portion is formed in the abutting surface, and the solid lubricant which has been previously solidified into a predetermined shape is fitted into the one raceway ring.

Description

Rolling bearing, rotating device, and method for manufacturing rolling bearing Technical Field The present invention relates to a rolling bearing, a rotary apparatus, and a method of manufacturing the rolling bearing. Background Conventionally, there is a rolling bearing in which grease is held between a pair of raceway rings (inner ring and outer ring). Since a thickener for semisolid lubricating oil is used in the grease, the rotational torque of the rolling bearing may be increased by the stirring resistance of the grease. However, in the rolling bearing, a reduction in torque is desired for the purpose of power saving of the mounted rotating equipment. In particular, small rolling bearings used for various motors such as fan motors are strongly required to have low torque. As a means for reducing the rotational torque of the rolling bearing, there is a method of disposing a solid lubricant inside the bearing instead of applying grease. For example, patent documents 1 and 2 disclose a technique of disposing a solid lubricant formed of a mixture of grease and ultrahigh molecular weight polyolefin particles in a rolling bearing. Prior art literature Patent literature Japanese patent application laid-open No. 55-137198; Patent document 2 Japanese unexamined patent publication No. 6-18730. Disclosure of Invention Problems to be solved by the invention However, if the solid lubricant is disposed inside the rolling bearing, the solid lubricant may be displaced during use of the rolling bearing, and may contact the rolling element or the like, thereby increasing the rotational torque of the rolling bearing. Therefore, the present invention suppresses an increase in rotational torque for a long period of time in a rolling bearing provided with a solid lubricant. Further, a rotary device provided with the rolling bearing and a method for manufacturing the rolling bearing are provided. Means for solving the problems The rolling bearing according to claim 1 of the present invention comprises an inner ring and an outer ring coaxially arranged with each other, rolling elements arranged between the inner ring and the outer ring, an annular retainer arranged between the inner ring and the outer ring and holding the rolling elements in a rolling manner, and a solid lubricant arranged between the inner ring and the outer ring, wherein one of the inner ring and the outer ring has a peripheral surface facing the other, and a raceway surface for supporting the rolling elements in a rolling manner is formed on the peripheral surface, and an abutment surface extends outward in the axial direction from an end edge of the raceway surface in the axial direction, and the solid lubricant is in contact with a recess formed in one of the abutment surface and the retainer. According to the 1 st aspect, the solid lubricant is disposed on the peripheral surface of the one raceway ring or the retainer, so that the lubricant oozing out from the solid lubricant can be supplied to the sliding portion, and the rotational torque of the rolling bearing can be reduced. Further, the solid lubricant contacts the concave portion, so that the solid lubricant is less likely to be displaced during use of the rolling bearing. This can suppress contact between the solid lubricant and the rolling elements. Therefore, a rolling bearing capable of suppressing an increase in rotational torque over a long period of time can be provided. In addition, in the related art, it is necessary to mold a solid lubricant which has been cured and molded in advance in a mold and then assemble the solid lubricant to a rolling bearing. In contrast, according to claim 1, as a method of forming the solid lubricant, a method of applying a mixture of the solid lubricant before curing to the concave portion and then curing the mixture can be adopted. Thus, even when it is difficult to dispose the solidified solid lubricant inside the rolling bearing, the solid lubricant can be disposed at a predetermined position. The rolling bearing according to claim 2 of the present invention may be the rolling bearing according to claim 1 of the present invention, wherein the concave portion is formed in the abutting surface. If the solid lubricant disposed on the adjacent surface is not in contact with the concave portion, the solid lubricant disposed on the adjacent surface is likely to be displaced in the axial direction. According to claim 2, the solid lubricant disposed on the adjacent surface engages with the concave portion, and the positional deviation in the axial direction is restricted. Therefore, the above-described effects can be effectively achieved. The rolling bearing according to claim 3 of the present invention may be the rolling bearing according to claim 2, wherein the solid lubricant is in contact with a portion of the concave portion in a direction inclined outward in the axial direction with respect to the radial direction. According to claim 3, the portion of the c