Patent US4787347A successfully refreshed from Google Patents.
US4787347A
Expired / Lapsed
US
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Self-adjusting hydraulic valve tappet
Assignee: INA Waelzlager Schaeffler OHG
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Filing: 1987-09-28
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Granted: 1988-11-29
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Expires: 2007-09-28
Abstract
Abstract A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and comprising a cup-shaped housing (1) formed by a hollow cylindrical wall (2) closed at one end by an end member (3) against the outside of which a cam abuts, a radial flange (4) provided in the bore of the hollow cylindrical wall (2) at a distance from the end member and guides for longitudinal movement of the hydraulic play compensating element (6) in a bore (5) concentric to the hollow cylindrical wall (2), characterized in that the radial flange (4) is a separate unit made of a material which has a higher thermal expansion coefficient than steel and the radial flange is inserted with its outer surface (7) in liquid-tight manner in the bore of the hollow cylindrical wall (2) and fixed therein.
Inventors
- 👤 Georg Schaeffler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:52
CPC Classifications
F; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245; F01L1/25
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
185 words
A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and comprising a cup-shaped housing (1) formed by a hollow cylindrical wall (2) closed at one end by an end member (3) against the outside of which a cam abuts, a radial flange (4) provided in the bore of the hollow cylindrical wall (2) at a distance from the end member and guides for longitudinal movement of the hydraulic play compensating element (6) in a bore (5) concentric to the hollow cylindrical wall (2) and formed as a separate unit inserted in liquid-tight manner in the bore of the hollow cylindrical wall (2) and fixed therein, characterized in that the radial flange (4) is made of a material which has a higher thermal expansion coefficient than steel and the wall thickness of the hollow cylindrical wall (2) is thin walled at least in the longitudinal area in which the outer surface of the radial flange (4) is arranged so that during heat expansion, the radial flange (4) is capable of elastically widening the wall (2) outwardly.
Claim 2
Dependent Claim
185 words
A self-adjusting hydraulic valve tappet arranged in a guide bore of a cylinder head of an internal combustion engine and comprising a cup-shaped housing (1) formed by a hollow cylindrical wall (2) closed at one end by an end member (3) against the outside of which a cam abuts, a radial flange (4) provided in the bore of the hollow cylindrical wall (2) at a distance from the end member and guides for longitudinal movement of the hydraulic play compensating element (6) in a bore (5) concentric to the hollow cylindrical wall (2) and formed as a separate unit inserted in liquid-tight manner in the bore of the hollow cylindrical wall (2) and fixed therein, characterized in that the radial flange (4) is made of a material which has a higher thermal expansion coefficient than steel and the wall thickness of the hollow cylindrical wall (2) is thin walled at least in the longitudinal area in which the outer surface of the radial flange (4) is arranged so that during heat expansion, the radial flange (4) is capable of elastically widening the wall (2) outwardly.
Claim 3
Dependent Claim
17 words
A valve tappet of claim 1 wherein the higher thermal expansion coefficient is approximately that of aluminum.
Claim 4
Dependent Claim
39 words
A valve tappet of claim 1 wherein an additional seal especially in the form of an O-ring (12) is provided between the bore of the hollow cylindrical wall (2) and the outer surface (7) of the radial flange (4).
Claim 5
Dependent Claim
19 words
A valve tappet of claim 1 wherein the radial flange (4) is provided with several circumferentially spaced recesses (13).
Claim 6
Dependent Claim
82 words
A valve tappet of claim 1 wherein the radial flange (4) is provided in the vicinity of its outer surface (7) with a hollow cylindrical collar (14) extending axially close to the end member (3) and defining at least one circumferential area together with the bore of the hollow cylindrical wall (2), a longitudinal channel (15) for the oil supply which channel communicates in the area of the radial flange (4) with a bore (17) extending from the oil supply groove (10).
Claim 7
Dependent Claim
38 words
A valve tappet of claim 1 wherein the radial flange (4) is provided at its outer surface (7) with a circumferential groove (8) which engages a projection (9) of the hollow cylindrical wall (2) in a formfitting manner.
Claim 8
Dependent Claim
37 words
A valve tappet of claim 6 wherein the projection of the hollow cylindrical wall (2) is a circumferential enlargement (9) which restricts an oil supply groove (10) in the outer surface of the hollow cylindrical wall (2).
Claim 9
Dependent Claim
19 words
A valve tappet of claim 6 wherein the radial flange (4) is provided with several circumferentially spaced recesses (13).
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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |