US4094279A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ductile iron roller tappet body and method for making same
Assignee: Sealed Power Technologies LP
•
Filing: 1976-05-07
•
Granted: 1978-06-13
•
Expires: 1996-05-07
Abstract
Abstract A roller tappet includes a central valve lifter body having a bifurcated end. A roller is supported at the bifurcated end and adapted for engagement by the lobes of a cam shaft. The valve lifter body reciprocates within a cylindrical bore defined by a cast iron engine block. The roller tappet body is formed from a ductile iron material thereby decreasing side wall wear and substantially eliminating galling between the valve lifter body and the wall of the cast iron tappet bore.
Inventors
- 👤 Kenneth E. Kueny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:47
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/14; F01L2307/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
48 words
In a roller tappet of the type including a central valve lifter body having a bifurcated end supporting a roller, the body being adapted for reciprocating movement within a bore formed in a cast iron engine block, wherein the improvement comprises: said body being formed from nodular iron.
Claim 2
Dependent Claim
48 words
In a roller tappet of the type including a central valve lifter body having a bifurcated end supporting a roller, the body being adapted for reciprocating movement within a bore formed in a cast iron engine block, wherein the improvement comprises: said body being formed from nodular iron.
Claim 3
Dependent Claim
20 words
The improvement as defined by claim 1 wherein said nodular iron body has a tensile strength of approximately 80,000 PSI.
Claim 4
Dependent Claim
43 words
The improvement as defined by claim 1 wherein said nodular iron body is comprised of 3.20 to 4.10% carbon; 1.80 to 2.80% silicon; up to 0.80% manganese; 0.01% maximum phosphorous; 0.03% maximum sulfur; up to 0.10% magnesium and the remaining portion being iron.
Claim 5
Independent Claim
32 words
A method of fabricating an improved roller tappet having a valve lifter body for use in cast iron engine blocks, comprising the step of: fabricating said valve lifter body from nodular iron.
Claim 6
Independent Claim
32 words
A method of fabricating an improved roller tappet having a valve lifter body for use in cast iron engine blocks, comprising the step of: fabricating said valve lifter body from nodular iron.
Claim 7
Dependent Claim
20 words
The method as defined by claim 4 wherein said nodular iron has a tensile strength of at least 80,000 PSI.
Claim 8
Dependent Claim
45 words
The method as defined by claim 4 wherein said nodular iron consists essentially of 3.20 to 4.10% carbon; 1.80 to 2.80% silicon; up to 0.80% manganese; 0.10% maximum content of phosphorous; 0.03% maximum content of sulfur; up to 0.10% magnesium and the remainder being iron.
References Cited (Backward Citations)
US1649409A
Cited
US3124869A
Cited
US1528675A
Cited
US1551631A
Cited
US1582883A
Cited
US2682863A
Cited
US2963011A
Cited
US3122822A
Cited
US3149410A
Cited
US3690959A
Cited
US3412721A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |