Valve rotating device for exhaust valves, in particular of marine diesel engines

摘要

A valve rotator for exhaust valves, particularly of marine diesel engines, which is supported in a valve housing for the valve stem (1) between an upper and a lower drive element is connected to the lower drive element via a freewheel device, which rotates the valve spindle (1) during its closing movement transfers; it is supported relative to the upper drive element via a rotary cylinder (15) which, in engagement with a stationary support cylinder (13), causes the rotation of the valve spindle (1); the upper drive element is formed by a hydraulic cylinder (6) for controlling the opening stroke of the valve and the lower drive element by the piston (18) of a pneumatic cylinder (5) for controlling the closing movement of the valve. In this case, the rotary cylinder (15) above the freewheel device distributed over its circumference a plurality of radial bores (32), and annular gaps are for the thereby flowing hydraulic oil between the two cylinders (13, 15) and between the support cylinder and a recess (17) of the piston ( 18) is provided.