Valve operating mechanism for an internal-combustion engine

Details Valve operating mechanism for an internal-combustion engine Valve operating mechanism for an internal-combustion engine

1993-08-27

1994-09-13

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 906, 74568R, F01L 134

Patent

active

053458982

ABSTRACT:
A valve operating mechanism for an internal combustion engine is disclosed which includes a camshaft arranged in the cylinder head of an internal-combustion engine. A center shift cam is provided which can be selectively connected in a form-locking manner to be rotated on the camshaft or to be rotatable with respect to the cam shaft. On each side of the shift cam, one fixed cam is provided each of which is non-rotatably connected with the camshaft. In the full-load operation of the internal-combustion engine, an electronic control guides by way of a lock valve pressure oil into a hydraulic chamber of the fixed cam and in this case displaces pistons as well as a hollow piston to thereby connect the shift cam with one of the fixed cams. The form-lockingly coupled shift cam actuates intake valves by a relatively large lift by way of a tappet. In the partial-load operation, while the oil pressure is disconnected, the fixed cams actuate the tappet by a smaller lift.

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patent: 5253621 (1993-10-01), Dopson et al.
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Patent Abstracts of Japan, vol. 15, No. 19052; (M-113) May 16, 1991; JP-A-03 047 416 (Mitsubishi).

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