US3734582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination bearing materials
Assignee: NTN Europe SA
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Filing: 1971-10-29
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Granted: 1973-05-22
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Expires: 1991-10-29
Abstract
Abstract This invention relates to the manufacture of rolling-contact bearings wherein the outer and inner races or rings were hitherto made of the same steel grade and subjected to a heat treatment with or without a preliminary cementation. According to this invention, the inner races of the bearings are made of cementation steel and the outer races as well as the rolling-contact members, such as balls and rollers from corehardened alloy steel. The treatment consists of a case-hardening or cementation applied to the inner races and of a hardening process applied to the outer races and rolling bodies.
Inventors
- 👤 J Beauchet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:43
CPC Classifications
F; F16; F16C; F16C33/00; F16C33/30; F16C33/58; F16C33/62; F16C19/00; F16C19/02; F16C19/04; F16C19/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
58 words
A roller-contact bearing comprising: an outer race, a plurality of rolling members within said outer race, said outer race and said rolling bodies comprising a relatively high-carbon steel which is surface-hardened and tension prestressed at their running surfaces, and an inner race comprising a relatively low-carbon cementation steel which is case-hardened and compression pre-stressed at its running surface.
Claim 2
Dependent Claim
58 words
A roller-contact bearing comprising: an outer race, a plurality of rolling members within said outer race, said outer race and said rolling bodies comprising a relatively high-carbon steel which is surface-hardened and tension prestressed at their running surfaces, and an inner race comprising a relatively low-carbon cementation steel which is case-hardened and compression pre-stressed at its running surface.
Claim 3
Dependent Claim
167 words
The roller-contact bearing of claim 1, wherein said relatively high-carbon steel is a composition comprising by weight: about 0.95 to about 1.10 per cent carbon; about 1.50 to about 1.60 per cent chromium; about 0.25 to about 0.40 per cent manganese; about 0.10 to about 0.35 per cent silicon; not greater than about 0.30 per cent nickel; not greater than about 0.025 per cent total phosphorus and sulfur; the remainder of said relatively high-carboN steel composition being iron; and wherein said relatively low-carbon steel is a composition comprising by weight: about 0.15 to about 0.25 per cent carbon; about 0.20 to about 0.35 per cent silicon; about 0.30 to about 0.60 per cent manganese; about 0.20 to about 0.60 per cent chromium; about 1.65 to about 2.00 per cent nickel; about 0.20 to about 0.30 per cent molybdenum; about 0.015 to about 0.045 per cent aluminum; not greater than about 0.055 per cent total phosphorous and sulfur; the remainder of said relatively low-carbon steel composition being iron.
References Cited (Backward Citations)
US3275389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |