US4359022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for an internal combustion engine
Assignee: Toshiba Corp
•
Filing: 1980-03-17
•
Granted: 1982-11-16
•
Expires: 2000-03-17
Abstract
Abstract A valve for an internal combustion engine formed of ceramic material for resistance to corrosion, heat and wear. The valve may include a valve tip, a lock groove, a valve stem, a valve fillet, a valve face, a valve margin and a valve head. Certain portions of the valve, such as the valve tip, the lock groove and the valve stem may, alternatively, be formed of metal. The ceramic material includes, among other compositions, silicon nitride, silicon carbide, aluminum nitride, silicon oxynitride, silicon aluminum oxynitride and silicon nitride-silicon carbide.
Inventors
- 👤 Kiyoshi Nakamura
- 👤 Masae Nakanishi
- 👤 Syozo Kawasaki
- 👤 Toshihiko Ochiai
- 👤 Katsutoshi Nishida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:38
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0085; F02F7/0087; C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/593; F01; F01L; F01L3/00; F01L3/02; F05; F05C; F05C2203/00; F05C2203/08; F05C2203/0804; F05C2203/0813; F05C2203/0817; F05C2203/083; F05C2203/0843; F05C2253/00; F05C2253/16; F16; F16C; F16C2240/00; F16C2240/40; F16C2240/54
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
A valve for use in an internal combustion engine, said valve consisting essentially of ceramic material and wherein said valve further comprises a valve stem including fiber-like structure oriented along a longitudinal axis of said valve stem, said valve stem extending in the lengthwise dimension of said valve and a valve top portion including a fiber-like structure oriented so as to be substantially parallel to adjacent surface portions of said valve top portion.
Claim 2
Dependent Claim
73 words
A valve for use in an internal combustion engine, said valve consisting essentially of ceramic material and wherein said valve further comprises a valve stem including fiber-like structure oriented along a longitudinal axis of said valve stem, said valve stem extending in the lengthwise dimension of said valve and a valve top portion including a fiber-like structure oriented so as to be substantially parallel to adjacent surface portions of said valve top portion.
Claim 3
Dependent Claim
27 words
The valve according to claim 1, said valve having surface roughness of less than 2S wherein S indicates surface roughness according to Japanese Industrial Standard B 0601.
Claim 4
Dependent Claim
15 words
The valve according to claim 1, wherein said valve further comprises a hot pressed valve.
Claim 5
Dependent Claim
19 words
The valve according to claim 1, wherein said valve is of a density higher than 90% of theoretical density.
Claim 6
Dependent Claim
21 words
The valve according to claim 1, wherein said valve has a flexural strength greater than 50 kg/cm 2 at 800° C.
Claim 7
Dependent Claim
13 words
The valve according to claim 1, wherein said ceramic material comprises silicon nitride.
Claim 8
Dependent Claim
17 words
A valve according to claim 1, said valve comprising a poppet valve for said internal combustion engine.
Claim 9
Dependent Claim
59 words
A valve according to claim 7, said poppet valve comprising a valve tip, said valve including a lock groove portion formed therein adjacent said valve tip, a valve stem, a valve face, a valve fillet interconnecting said valve stem and said valve face, a valve head and a valve margin positioned between said valve face and said valve head.
References Cited (Backward Citations)
US1559439A
Cited
US2595671A
Cited
US3066663A
Cited
US3412931A
Cited
US3408995A
Cited
US3636605A
Cited
US3837356A
Cited
US3917110A
Cited
US4074671A
Cited
DE2729230A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |