US 12,326,173 B2
Rolling bearing, rotating device, and method for manufacturing rolling bearing
Akihiro Iino, Chiba (JP); Takayuki Kosaka, Chiba (JP); and Keisuke Abo, Chiba (JP)
Assigned to SEIKO INSTRUMENTS INC., Chiba (JP)
Filed by Seiko Instruments Inc., Chiba (JP)
Filed on May 25, 2023, as Appl. No. 18/324,013.
Claims priority of application No. 2022-092902 (JP), filed on Jun. 8, 2022; and application No. 2023-073816 (JP), filed on Apr. 27, 2023.
Prior Publication US 2023/0400061 A1, Dec. 14, 2023
Int. Cl. F16C 33/66 (2006.01); F16C 19/06 (2006.01)
CPC F16C 33/6696 (2013.01) [F16C 19/06 (2013.01); F16C 2223/30 (2013.01); F16C 2380/26 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A rolling bearing comprising:
an inner ring and an outer ring disposed coaxially with each other; and
a rolling element and grease disposed between the inner ring and the outer ring,
wherein a coating film is formed on an inner circumferential surface of the inner ring and an outer circumferential surface of the outer ring, the coating film containing a mixture of calcium sulfonate and calcium carbonate or a compound obtained from calcium sulfonate and calcium carbonate, and
wherein the coating film does not reside on the outer circumferential surface of the inner ring nor on the inner circumferential surface of the outer ring.
 
8. A method for manufacturing a rolling bearing, the rolling bearing comprising a rolling element and grease disposed between an inner ring and an outer ring, the inner ring and the outer ring disposed coaxially with each other, the method for manufacturing the rolling bearing comprising:
forming a coating film by applying, to an inner circumferential surface of the inner ring and an outer circumferential surface of the outer ring, a coating film composition containing a mixture of calcium sulfonate and calcium carbonate or containing a compound obtained from calcium sulfonate and calcium carbonate,
wherein the applying comprises rubbing the coating film composition with an application member against the inner circumferential surface of the inner ring and the outer circumferential surface of the outer ring, and the coating film is not formed on the outer circumferential surface of the inner ring nor on the inner circumferential surface of the outer ring.