Valve rotating device

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In high- speed internal combustion engines, valve rotating devices (also called rotocaps ) can be installed under the valve springs . These are intended to prevent uneven heating and distortion of the valve disks and the build-up of combustion residues on the valve disk and valve seat, especially on the exhaust valve .

Mode of action

When the valve is opened, a disc spring , which is attached under the valve spring, is flattened by the increasing spring force. The disc spring presses more on a ring of balls.

The disc spring forces the balls to roll down on their inclined tracks and even roll on the balls. As a result, the valve is turned a little with each opening stroke. When the valve closes, the balls are pushed back into their starting position by small compression springs without also turning back the disc spring and the valve.

literature

  • Peter A. Wellers, Hermann Strobel, Erich Auch-Schwelk: Vehicle technology expertise. 5th edition, Holland + Josenhans Verlag, Stuttgart, 1997, ISBN 3-7782-3520-6
  • Wilfried Staudt: Vehicle technology manual. Volume 2: Energy supply and starting systems, engine mechanics, engine management systems, exhaust systems. Bildungsverlag EINS, Troisdorf 2005, ISBN 3-427-04522-6 .