Device for simultaneous actuation of at least two gas exchange valves
AssigneeINA Walzlager Schaeffler KG
InventorWalter Speil
Life of this patent
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Abstract
A device (1) for simultaneous actuation of at least two gas exchange valves (2) of an internal combustion engine comprising a bridge-type cam follower (3) arranged in driving relationship between a camshaft and the gas exchange valves (2) and serving to directly transmit a stroke motion caused by a control cam (4) of the camshaft to the gas exchange valves (2), said cam follower (3) being guided by guiding means (18,19) for vertical displacement in a cylinder head and comprising a cam contacting element (31) on which the control cam (4) runs, characterized in that the cam contacting element (31) in the cam follower (3) is displaceable relative to the cam follower (3) so that the cam follower (3) can be uncoupled from a stroke-transmitting motion of the control cam (4).
Claims20
A device (1) for simultaneous actuation of at least two gas exchange valves (2) of an internal combustion engine comprising a bridge-type cam follower (3) with a generally rectangular outer contour arranged in driving relationship between a camshaft and the gas exchange valves (2) and serving to directly transmit a stroke motion caused by a control cam (4) of the camshaft to the gas exchange valves (2), said cam follower (3) being guided by guiding means (18,19) for substantially uniform vertical displacement in a cylinder head and comprising a cam contacting element (31) on which the control cam (4) contacts, characterized in that the cam contacting element (31) formed on a lever (5) mounted in the cam follower (3) is displaceable relative to the cam follower (3) so that the cam follower (3) can be uncoupled from a stroke-transmitting motion of the control cam (4) for at least a portion of the stroke-transmitting motion of the control cam, the cam follower being guided at one of its smaller sides (36,37) by guiding columns (18,19) connected to the cylinder head, said columns (18,19) extending in complementary bores (38,39) of the cam follower (3) opposite the gas exchange valves (2) while being fixed optionally in the cylinder head or in the cam follower (3) to be slidable in the other one of the cam follower (3) and the cylinder head and a displaceable coupling means (15) is provided in the lever (5), the coupling means (15) comes to extend beyond at least one parting plane (30) formed between the lever (5) and the cam follower (3) to effect coupling, the cam contacting element (31) being brought to bear against the control cam (4) by the lever (5) and by a spring means (7) acting between the lever (5) and the cam follower (3).
Dependencies are inferred from the claim text.