US4073474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poppet valve
Assignee: Toyota Motor Corp
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Filing: 1975-12-30
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Granted: 1978-02-14
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Expires: 1995-12-30
Abstract
Abstract An upset-forged poppet valve wherein at least the head portion and a part of the neck is made of a high temperature super alloy while the remaining portion is made of a conventional valve steel, said two materials being connected by friction welding before said valve is forged. The method comprises two steps of first friction-welding two rods of said two materials and then forming the connected single rod into the poppet valve by upset-forging.
Inventors
- 👤 Kametaro Hashimoto
- 👤 Kenji Ushitani
- 👤 Yoichi Serino
- 👤 Tadaoki Arakawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:06
CPC Classifications
F; F01; F01L; F01L3/00; B; B23; B23K; B23K20/00; B23K20/12; B23K20/129; F16; F16K; F16K1/00; F16K1/32; F16K1/34; F16K1/36; F16K1/38; F02; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49307; Y10T29/49309
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
An upset-forged poppet valve comprising a first portion which includes the valve head and at least a part of the valve neck and a second portion which includes the remaining portion of the valve including the valve stem, said first and second portions being bordered by a friction-welded joint formed prior to an upset-forging process of the valve, wherein said first portion is made of super alloy having a composition consisting essentially of less than 0.15% C, 15-26% Cr, 1-10% Co, 5-18% Fe, more than 0.8% Ti, more than 0.8% Al, provided that Ti plus Al is between 1.6-5.0% and the substantial balance being Ni and impurities, and said second portion is made of a conventional valve steel.
Claim 2
Dependent Claim
118 words
An upset-forged poppet valve comprising a first portion which includes the valve head and at least a part of the valve neck and a second portion which includes the remaining portion of the valve including the valve stem, said first and second portions being bordered by a friction-welded joint formed prior to an upset-forging process of the valve, wherein said first portion is made of super alloy having a composition consisting essentially of less than 0.15% C, 15-26% Cr, 1-10% Co, 5-18% Fe, more than 0.8% Ti, more than 0.8% Al, provided that Ti plus Al is between 1.6-5.0% and the substantial balance being Ni and impurities, and said second portion is made of a conventional valve steel.
Claim 3
Dependent Claim
130 words
An upset-forged poppet valve comprising a first portion which includes the valve head and at least a part of the valve neck and a second portion which includes the remaining portion of the valve including the valve stem, said first and second portions being bordered by a friction-welded joint formed prior to an upset-forging process of the valve, wherein said first portion is made of a super alloy having a composition consisting essentially of less than 0.15% C, 15-26% Cr, 1-10% Co, 5-18% Fe, more than 0.8% Ti, more than 0.8% Al, provided that Ti plus Al is between 1.6-5.0%, less than 2% of either Mo or W or both, and the substantial balance being Ni and impurities, and said second valve portion is made of a conventional valve steel.
Claim 4
Dependent Claim
130 words
An upset-forged poppet valve comprising a first portion which includes the valve head and at least a part of the valve neck and a second portion which includes the remaining portion of the valve including the valve stem, said first and second portions being bordered by a friction-welded joint formed prior to an upset-forging process of the valve, wherein said first portion is made of a super alloy having a composition consisting essentially of less than 0.15% C, 15-26% Cr, 1-10% Co, 5-18% Fe, more than 0.8% Ti, more than 0.8% Al, provided that Ti plus Al is between 1.6-5.0%, less than 2% of either Mo or W or both, and the substantial balance being Ni and impurities, and said second valve portion is made of a conventional valve steel.
Claim 5
Dependent Claim
112 words
An upset-forged poppet valve comprising a first portion which includes the valve head and at least a part of the valve neck and a second portion which includes the remaining portion of the valve including the valve stem, said first and second portions being bordered by a friction-welded joint formed prior to an upset-forging process of the valve, wherein said first portion is made of a super alloy having a composition consisting essentially of less than 0.05% C, 19-21% Cr, 1-3% Co, 2.5-3.0% Ti, 1.2-1.6% Al, 0.3-0.5% Nb plus Ta, 11-13% Fe, and the substantial balance being Ni and impurities, and said second valve portion is made of a conventional valve steel.
Claim 6
Dependent Claim
112 words
An upset-forged poppet valve comprising a first portion which includes the valve head and at least a part of the valve neck and a second portion which includes the remaining portion of the valve including the valve stem, said first and second portions being bordered by a friction-welded joint formed prior to an upset-forging process of the valve, wherein said first portion is made of a super alloy having a composition consisting essentially of less than 0.05% C, 19-21% Cr, 1-3% Co, 2.5-3.0% Ti, 1.2-1.6% Al, 0.3-0.5% Nb plus Ta, 11-13% Fe, and the substantial balance being Ni and impurities, and said second valve portion is made of a conventional valve steel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-02-13 | 1981-08-15 | 1982-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-13 | 1985-08-15 | 1986-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-13 | 1989-08-15 | 1990-02-14 | $7700.00 | Window Closed / Lapsed |