US5404770A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable cam arrangement for a lift valve
Assignee: Volkswagen AG
•
Filing: 1993-06-09
•
Granted: 1995-04-11
•
Expires: 2013-06-09
Abstract
Abstract A variable cam arrangement for a lift valve includes a cam having a rigid part which is movable on a camshaft in a radial direction between a retracted and an extended position, the movable part being guided on the camshaft, and stops on the camshaft and the movable part to limit the motion of the part.
Inventors
- 👤 Hermann Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
F; F01; F01L; F01L13/00; F01L13/0015; F01L13/0036; F01L13/0057; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49293; Y10T74/00; Y10T74/21; Y10T74/2101; Y10T74/2102
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
88 words
A variable cam arrangement for a lift valve comprising a camshaft, cam means rotationally fixed on the camshaft including a rigid cam part supported for radial displacement with respect to the camshaft for the purpose of varying the valve lift curve, wherein the rigid part surrounds the camshaft and has an oblong aperture through which the camshaft passes and including a guide pin extending through the camshaft parallel to the lengthwise centerline of the oblong aperture to serve as a guide for radial motion of the rigid part.
Claim 2
Dependent Claim
88 words
A variable cam arrangement for a lift valve comprising a camshaft, cam means rotationally fixed on the camshaft including a rigid cam part supported for radial displacement with respect to the camshaft for the purpose of varying the valve lift curve, wherein the rigid part surrounds the camshaft and has an oblong aperture through which the camshaft passes and including a guide pin extending through the camshaft parallel to the lengthwise centerline of the oblong aperture to serve as a guide for radial motion of the rigid part.
Claim 3
Dependent Claim
23 words
A variable cam arrangement according to claim 1 wherein the camshaft and the rigid part have mutually facing surfaces which serve as stops.
Claim 4
Dependent Claim
21 words
A variable cam arrangement according to claim 1 wherein the oblong aperture in the rigid part encloses a crescent-shaped pressure space.
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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) | 1998-04-10 | 1998-10-10 | 1999-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-04-10 | 2002-10-10 | 2003-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-04-10 | 2006-10-10 | 2007-04-11 | $7700.00 | Window Closed / Lapsed |