Claims
- 1. An alternator for vehicles comprising a rotary shaft of a rotor which is rotably supported by a pair of bearings,..each comprising a fixed ring and a rotary ring, on a frame having a stator, and a drive pulley which is mounted on one end of the rotary shaft projecting outward from the frame, wherein the alternator comprises at least the bearing directed toward the pulley comprising a fixed ring comprising a steel containing up to about 10% of residual austenite.
- 2. An alternator as defined in claim 1 wherein said steel containing limited proportion of austenite has been made by subjecting steel having a higher austenite content to a sub-zero treatment.
- 3. An alternator as defined in claim 1 wherein said steel containing limited proportion of austenite has been made by subjecting steel having a higher austenite content to tempering at a temperature of 250.degree. to 380.degree. C.
- 4. An alternator as defined in claim 1 wherein said steel containing limited proportion of austenite has been made by subjecting steel having a higher austenite content to a sub-zero treatment and a subsequent tempering treatment at a temperature of 170.degree. to 230.degree. C.
- 5. An alternator as defined in claim 1 wherein said steel has been subjected to carburization hardening.
- 6. An alternator as defined in claim 1 wherein the amount of residual austenite is up to 6%.
Priority Claims (2)
Number |
Date |
Country |
Kind |
62-145483 |
Jun 1987 |
JPX |
|
62-145484 |
Jun 1987 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 07/203,972 filed Jun. 8, 1988.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
203972 |
Jun 1988 |
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