| 摘要 |
A valve rotating mechanism for exhaust valves, especially of marine diesel engines, which mechanism is braced in a valve housing for the valve stem ( 1 ) between an upper and a lower drive element, is linked to the lower drive element via a freewheel device, which transmits rotation of the valve stem ( 1 ) during closing movement thereof, and is also braced relative to the upper drive element via a rotary cylinder ( 15 ), which brings about rotation of the valve stem ( 1 ) through engagement with a fixed support cylinder ( 13 ). Therein the rotary cylinder ( 15 ) and support cylinder ( 13 ) are engaged with one another via a helical gearing, wherein the rotary cylinder ( 15 ) is linked to the valve stem ( 1 ) via the freewheel device and the support cylinder ( 13 ) is fastened on the housing side.
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