Variable valve drive for changing the control timing of cam-actuated gas-exchange valves
AssigneeSchaeffler KG
InventorsDonald Haefner, Florin Bugescu
Life of this patent
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Abstract
A variable valve drive for changing control timing of cam-actuated gas-exchange valves of an internal combustion engine is provided, with a tappet (6a, 6b, 6c), which, with convex cam engaging contour (5), engages a cam (4a, 4b, 4c) of a camshaft (3a, 3b, 3c) and which is guided so that it can move in the longitudinal direction in a rotatable tappet guide (7a, 7b, 7c), whose rotational angle (9) is adjustable for changing the control timing. In this way, the tappet guide (7a, 7b, 7c) can rotate about a rotational axis (8) parallel to a longitudinal axis (2) of the camshaft (3a, 3b, 3c).
Claims12
Variable valve drive for changing control timing of one or more cam-actuated gas-exchange valves of an internal combustion engine, comprising a tappet (6a, 6b, 6c), which, with convex cam engaging contours (5), engages a cam (4a, 4b, 4c) of a camshaft (3a, 3b, 3c) and which is guided so that it can move in a longitudinal direction in a rotatable tappet guide (7a, 7b, 7c), having a rotational angle (9) that is adjustable for changing the control timing, the tappet guide (7a, 7b, 7c) can rotate about a rotational axis (8) parallel to a longitudinal axis (2) of the camshaft (3a, 3b, 3c).
Dependencies are inferred from the claim text.