# US 11,078,961 B2 · Intermediary race member of rolling bearing, race, rolling bearing and production method therefor

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- Number: US 11,078,961 B2
- Document ID: US11078961B2
- Status: Granted
- Kind: B2
- Application number: 16/976,266
- Filed: 2018-06-15
- Published: 2020-12-31
- Granted: 2021-08-03
- Earliest claimed: 2018-04-02
- Assignees: Nsk Ltd.
- Applicants: Nsk Ltd.
- Inventors: Hideyuki Hidaka; Riichiro Matoba; Yuji Miyamoto
- Web page: https://patentgrep.com/patent/US11078961B2

## CPC

- F16C 33/64: Special methods of manufacture
- C21D 9/40: for rings; for bearing races
- F16C 33/62: Selection of substances
- F16C 2202/06: Strength or rigidity
- F16C 2204/64: Medium carbon steel, i.e. carbon content from 0.4 to 0,8 wt%
- F16C 2204/70: with chromium as the next major constituent
- F16C 2204/74: with manganese as the next major constituent
- F16C 2220/82: by cutting
- F16C 2223/06: polishing
- F16C 2223/10: Hardening, e.g. carburizing, carbo-nitriding
- F16C 2223/16: with carbo-nitriding
- F16C 2240/06: Temperature
- F16C 2240/18: Stress
- F16C 2316/10: in medical appliances, e.g. in diagnosis, dentistry, instruments, prostheses, medical imaging appliances
- F16C 2361/65: Gear shifting, change speed gear, gear box
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)

## Abstract

A method for manufacturing a bearing ring of a rolling bearing includes a series of steps of cutting out an annular member from a material, forming a surface-hardened layer on the annular member, quenching and tempering the annular member, and polishing inner and outer diameter surfaces of the annular member. The method includes, after the quenching, rapidly cooling the ring member such that the ring member has a surface temperature of 50° C. or lower to form a bearing ring intermediate member, and after the tempering, polishing inner and outer diameter surfaces of the bearing ring intermediate member.

## Claims

### Claim 1

A method for manufacturing a bearing ring of a rolling bearing, the method comprising a series of steps of:
cutting out a ring member from a material;
forming a surface-hardened layer on the ring member;
quenching and tempering the ring member; and
polishing an inner diameter surface and an outer diameter surface of the ring member, wherein
the method comprises:
after the quenching and before the tempering, rapidly cooling the ring member such that the ring member has a surface temperature of 50° C. or lower to form a bearing ring intermediate member; and
after the tempering, polishing an inner diameter surface and an outer diameter surface of the bearing ring intermediate member.

### Claim 2 (depends on 1)

The method for manufacturing the bearing ring of the rolling bearing according to claim 1, wherein
the rapid cooling is performed along with cleaning of the ring member with a cleaning liquid after the quenching and before the tempering.

### Claim 3 (depends on 1)

The method for manufacturing the bearing ring of the rolling bearing according to claim 1, wherein
an absolute value of an average residual stress of each part from a surface to a core portion of the bearing ring in a radial direction is 0 to 191 MPa.