The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 27, 2001
Filed:
Apr. 22, 1999
Applicant:
Inventors:
Wolfgang Stephan, Zizishausen, DE;
Alfred Trzmiel, Grafenberg, DE;
Assignee:
h.c.F. Porsche AG, Weissach, DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01L 1/34 ;
U.S. Cl.
CPC ...
F01L 1/34 ;
Abstract
A combustion engine valve control camshaft adjusting mechanism includes hydraulically actuated piston members to control the relative rotational position of a pair of camshafts. A locking detent is biased by a spring toward a locking position preventing the adjusting movement of the piston members. Hydraulic pressure is supplied to the detent in a direction opposite the spring to release the locking detent and permit the adjusting mechanism to operate after a predetermined engine warmup phase of up to a few seconds.