US4686947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic cup-shaped valve tappets
Assignee: Motomak Motorenbau Maschinen und Werkzeugfabrik Konstruktionen GmbH
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Filing: 1986-03-05
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Granted: 1987-08-18
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Expires: 2006-03-05
Abstract
Abstract An hydraulic cup-shaped valve tappet for internal combustion engines with overhead camshaft comprising an outer hollow cylindrical housing (7) closed at one end by a bottom (3) in which is provided, concentrically radially spaced, a guide tube starting from the bottom, and in which is supported a longitudinally moveble plunger (5) of an hydraulic clearance compensation element, against the face thereof the end of a valve stem is abutting, a control cam (4) abutting against the bottom of the housing, characterized in that in the circular space between the cylindrical internal surface of the housing (7) and the external surface of the guide tube (8) a bellow element (16,21,25,31) is provided, said element being tightly connected, on the one hand, with the internal surface of the housing (7) and, on the other hand, with an end of the plunger (5) projecting from the guide tube which is capable to simultaneously take up variations in length and in volume and which together with the remaining tappet components define an oil-filled internal space completely closed outwardly.
Inventors
- 👤 Walter Speil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:55
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/04; F16J3/041; F01; F01L; F01L1/00; F01L1/20; F01L1/22; F01L1/24; F01L1/245; F01L1/25; F16J3/047; F01L2309/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
176 words
An hydraulic cup-shaped valve tappet for internal combustion engines with an overhead camshaft comprising an outer hollow cylindrical housing (7) closed at one end by a bottom (3) in which is provided, concentrically radially spaced, a guide tube starting from the bottom, and in which is supported a longitudinally moveable plunger (5) of an hydraulic clearance compensation element, against the face thereof the end of a valve stem is abutting, a control cam (4) abutting against the bottom of the housing, characterized in that in the circular space between the cylindrical internal surface of the housing (7) and the external surface of the guide tube (8) a bellow element (16,21,25,31) is provided, said element being tightly connected, on the one hand, with the internal surface of the housing (7) and, on the other hand, with an end of the plunger (5) projecting from the guide tube (8) which is capable to simultaneously take up variations in length and in volume and which together with the remaining tappet components define an oil-filled internal space completely closed outwardly.
Claim 2
Dependent Claim
176 words
An hydraulic cup-shaped valve tappet for internal combustion engines with an overhead camshaft comprising an outer hollow cylindrical housing (7) closed at one end by a bottom (3) in which is provided, concentrically radially spaced, a guide tube starting from the bottom, and in which is supported a longitudinally moveable plunger (5) of an hydraulic clearance compensation element, against the face thereof the end of a valve stem is abutting, a control cam (4) abutting against the bottom of the housing, characterized in that in the circular space between the cylindrical internal surface of the housing (7) and the external surface of the guide tube (8) a bellow element (16,21,25,31) is provided, said element being tightly connected, on the one hand, with the internal surface of the housing (7) and, on the other hand, with an end of the plunger (5) projecting from the guide tube (8) which is capable to simultaneously take up variations in length and in volume and which together with the remaining tappet components define an oil-filled internal space completely closed outwardly.
Claim 3
Dependent Claim
42 words
A tappet of claim 1 wherein the bellows element (16,25) is formed of two hollow cylindrical bellows (17,18,26,27) concentrically arranged inside each other with space between them, which at one of their ends are joined together liquid-tight with a radial flange (19,28).
Claim 4
Dependent Claim
39 words
A tappet of claim 1 wherein the bellows element (21,31) is formed of a hollow cylindrical bellows (22,32), one end of which is joined to a circularly radially outwardly directed bellows (23,33) with fold-beads running concentrically to each other.
Claim 5
Dependent Claim
20 words
A tappet of claim 1 wherein the bellows element (16,31) is formed in one piece made of a polymeric material.
Claim 6
Dependent Claim
27 words
A tappet of claim 1 wherein the bellows element (25) is formed of separate metal bellows (26,27) which are connected to each other by soldering or welding.
Claim 7
Dependent Claim
15 words
A tappet of claim 5 wherein the connection is effected by high energy beam welding.
Claim 8
Dependent Claim
31 words
A tappet of claim 4 wherein metal rings (20,24,29,34) are attached at the free ends of the bellows element (16,21,25,31), particularly prevulcanized, to serve as connection to the adjoining tappet components.
Claim 9
Dependent Claim
26 words
A tappet of claim 7 wherein the metal rings (20,34) are coated with a polymeric material at their seatings next to the adjoining tappet components (35).
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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) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |