Claims
- 1. A full type ball bearing lubricated by an oil jet for turbochargers used in motor vehicle engines, being an angular-contact type and comprising:
- a raceway having an inner ring and an outer ring both made of steel, a wall thickness of said inner ring being larger than a wall thickness of said outer ring;
- a plurality of balls interposed between the rings and made of a ceramic; and
- a counterbore formed at least in the outer ring.
- 2. A full type ball bearing as defined in claim 1 wherein the ceramic forming the balls is selected from the group consisting of silicon nitride, sialon, silicon carbide and alumina.
- 3. A full type ball bearing as defined in claim 1, wherein said raceway is made of high-speed steel and said balls are composed of silicon nitride.
- 4. A full type ball bearing as defined in claim 1, wherein said ceramic has a density substantially less than that of steel.
- 5. A full type ball bearing as defined in claim 1, wherein said balls are positioned in said raceway with a ratio of circumferential clearance to ball diameter in the range of 0.2 to 0.8.
- 6. A full-type ball bearing according to claim 1, wherein inner and outer raceway grooves are formed on the inner and outer rings, respectively, and a thickness of the inner ring of said raceway outside of the inner raceway groove is even relative to a longitudinal centerline of the inner ring.
- 7. A full type ball bearing lubricated by an oil mist for turbochargers used in motor vehicle engines, being an angular-contact type and comprising:
- a raceway having an inner ring and an outer ring both made of steel, a wall thickness of said inner ring being larger than a wall thickness of said outer ring;
- a plurality of balls interposed between the rings and made of a ceramic; and
- a counterbore formed at least in the outer ring.
- 8. A full type ball bearing as defined in claim 7, wherein the ceramic forming the balls is selected from the group consisting of silicon nitride, sialon, silicon carbide and alumina.
- 9. A full type ball bearing as defined in claim 7, wherein said raceway is made of high-speed steel and said balls are made of silicon nitride.
- 10. A full type ball bearing as defined in claim 7, wherein said ceramic has a density substantially less than that of steel.
- 11. A full type ball bearing as defined in claim 7, wherein said balls are positioned in said raceway with a ratio of circumferential clearance to ball diameter in the range of 0.2 to 0.8.
- 12. A full-type ball bearing according to claim 7, wherein inner and outer raceway grooves are formed on the inner and outer rings, respectively, and a thickness of the inner ring of said raceway outside of the inner raceway groove is even relative to a longitudinal centerline of the inner ring.
- 13. A ball bearing system for turbochargers used in motor vehicle engines, comprising:
- a full-type, angular-contact ball bearing having a raceway which includes an inner ring and an outer ring both made of steel, a plurality of balls interposed between the rings and made of ceramic, and a counterbore formed at least in the outer ring, a wall thickness of the inner ring of said ball bearing being larger than a wall thickness of the outer ring; and
- a lubricating means for lubricating said full-type, angular-contact ball bearing so as to form a lubricant film between the plurality of balls and thereby minimize pressure between the balls caused by slipping contact.
- 14. A ball bearing system as defined in claim 13, wherein said lubricating means lubricates said ball bearing using an oil jet.
- 15. A ball bearing system as defined in claim 13, wherein the lubricating means lubricates said ball bearing using an oil mist.
- 16. A ball bearing system as defined in claim 13, wherein the ceramic forming the plurality of balls is selected from the group consisting of silicon nitride, sialon, silicon carbide and alumina.
- 17. A ball bearing system as defined in claim 13, wherein the raceway of said ball bearing is made of high-speed steel and the plurality of balls are made of silicon nitride.
- 18. A ball bearing system as defined in claim 13, wherein the ceramic forming the plurality of balls has a density substantially less than that of steel.
- 19. A ball bearing system as defined in claim 13, wherein the plurality of balls are positioned in the raceway of said ball bearing with a ratio of circumferential clearance to ball diameter in the range of 0.2 to 0.8.
- 20. A ball bearing system for turbochargers according to claim 13, wherein inner and outer raceway grooves are formed on the inner and outer rings, respectively, and a thickness of the inner ring of said raceway outside of the inner raceway groove is even relative to a longitudinal centerline of the inner ring.
Priority Claims (1)
Number |
Date |
Country |
Kind |
62-317052 |
Dec 1987 |
JPX |
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Parent Case Info
This application is a continuation-in-part of application Ser. No. 711,416 filed Jun. 5, 1991 now abandoned which is a continuation-in-part of Ser. No. 494,842, filed Mar. 14, 1990 now abandoned and a continuation of Ser. No. 283,718 filed Dec. 13, 1988 now abandoned.
US Referenced Citations (6)
Non-Patent Literature Citations (4)
Entry |
Deutschman et al Machine Design Theory and Practice, pp. 445-459, Dec. 1975. |
"Development of High-Efficiency Ball-Bearing Turbocharger", by Miyashita et al, pp. 1-6, with partial English translation thereof. |
"Performance of Ceramic Bearings in High Speed Turbine Application", by Takebayashi, SAE, Pa. Sep. 1990. |
Koyo Engineering Journal, No. 139, Mar. 1991. |
Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
711416 |
Jun 1991 |
|
Parent |
494842 |
Mar 1990 |
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