Patent US4768476A successfully refreshed from Google Patents.
US4768476A
Expired / Lapsed
US
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Tappet with ceramic camface
Assignee: Precision Engine Products Corp
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Filing: 1981-02-20
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Granted: 1988-09-06
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Expires: 2001-02-20
Abstract
Abstract A tappet for an internal combustion engine includes a tappet body having a camface at one end thereof, which camface is positioned for contact with a rotating camshaft. The camface is formed essentially of zirconium oxide.
Inventors
- 👤 Robert C. Behnke
- 👤 Todd R. Downing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:07
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/12; F01L1/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49298; Y10T29/49304; Y10T29/49826; Y10T29/49863; Y10T29/49865; Y10T29/49945
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
73 words
In a tappet for an internal combustion engine, a tappet body, a disc attached to said tappet body at one end thereof, said disc being formed essentially of zirconium oxide and providing the tappet camface which is positioned for contact with a rotating camshaft, said zirconium oxide disc having wear characteristics compatible with cast iron and steel and having essentially the same coefficient of thermal expansion as the material of the tappet body.
Claim 2
Dependent Claim
73 words
In a tappet for an internal combustion engine, a tappet body, a disc attached to said tappet body at one end thereof, said disc being formed essentially of zirconium oxide and providing the tappet camface which is positioned for contact with a rotating camshaft, said zirconium oxide disc having wear characteristics compatible with cast iron and steel and having essentially the same coefficient of thermal expansion as the material of the tappet body.
Claim 3
Dependent Claim
25 words
The tappet of claim 1 further characterized in that said tappet body has a closed end, with said disc being attached to said closed end.
Claim 4
Dependent Claim
25 words
The tappet of claim 2 further characterized in that said closed tappet body end includes a recess, with said disc being positioned within said recess.
Claim 5
Dependent Claim
26 words
The tappet of claim 1 further characterized in that said tappet body has an open end, with said disc forming a closure for said open end.
Claim 6
Dependent Claim
38 words
The tappet of claim 4 further characterized in that said tappet body open end includes an annular groove and a shoulder at one end of said groove, said disc being positioned within said groove and against said shoulder.
Claim 7
Dependent Claim
47 words
The tappet of claim 4 further characterized in that said disc includes a portion of reduced diameter and a shoulder adjacent thereto, with said portion of reduced diameter being positioned within said tappet body and with said shoulder being positioned against the end of said tappet body.
Claim 8
Dependent Claim
29 words
The tappet of claim 4 further characterized by and including a non-zirconium oxide insert extending partially within said tappet body and forming a support for said zirconium oxide disc.
Claim 9
Dependent Claim
33 words
The tappet of claim 7 further characterized in that said non-zirconium oxide insert is formed of metal and has a recess at one end thereof, with said disc being positioned within said recess.
References Cited (Backward Citations)
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |