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:
Aug. 18, 1992
Filed:
Jul. 25, 1991
Applicant:
Inventors:
Assignee:
Dr. Ing. h.c.F. Porsche AG, , DE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01L / ; F01L / ;
U.S. Cl.
CPC ...
123 9017 ; 123 9031 ; 464-2 ;
Abstract
An arrangement for changing the valve timing of an internal-combustion engine has a camshaft, which can be rotated relative to a shaft driving it. The camshaft has a phase converter with a piston which is hydraulically acted upon on both sides. In the camshaft, an axial recess is arranged in which an inserted pipe separates two spaces from one another. An on/off valve fed from the oil circulating system, in one position, via one of the spaces, supplies the piston with pressure oil so that this piston is axially shifted into a first end position and in the process rotates the camshaft. In a second position, the piston, by way of the second space is axially pushed back by pressure oil.