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:
Oct. 27, 1992
Filed:
Jan. 31, 1992
Joachim Neumann, Braunschweig, DE;
Volkswagen AG, , DE;
Abstract
Deactivatable cams on a camshaft are axially displaceable thereon by changes in pressure of a hydraulic medium in an adjacent pressure space. The deactivatable cams are axially displaced for engagement of cam-specific couplings which establish a rotationally fixed connection between the cams and the camshaft. To make certain that disengagement of the couplings will not occur until the corresponding valves are in the closed position, the couplings include claws with flanks which are inclined from base to apex so that, during the closing motion of the valves, the torque exerted by the valve-closing spring on the cam is partially transformed into an axial force which causes disengagement of the corresponding coupling when the pressure in the adjacent pressure space is reduced. To store increased pressure when engagement of the couplings is to be maintained, one wall of each pressure space is acted on by a compression spring.