Internal-combustion engines – Poppet valve operating mechanism – With means for varying timing
Patent
1992-01-31
1992-10-27
Cross, E. Rollins
Internal-combustion engines
Poppet valve operating mechanism
With means for varying timing
123 906, 74567, 74568R, F01L 104
Patent
active
051580497
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.
REFERENCES:
patent: 4730588 (1988-03-01), Maeda
patent: 4794893 (1989-01-01), Masuda et al.
patent: 4870872 (1989-10-01), Parsons
patent: 4886022 (1989-12-01), Nakai
patent: 5105679 (1992-04-01), Voigt
Cross E. Rollins
Lo Weilun
Volkswagen AG
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