success

Now the valve is circular, to facilitate the processing of such shape and can improve the precision machining.

In the course of engine operation, in addition to valve movement from top to bottom have also done outside the rotating movement. Valve's rotation without special institutions, in the spring under the pressure valve will be able to rotate. In the use of double-valve spring, the outer ring of the rotary valve spring valve to determine the direction of rotation.

As valve has a rotation, so to prevent foreign bodies caught in the valve between the ring and the valve seat. If carbon deposition, and other foreign bodies caught in the valve sealing cone, the valve will leak serious, the engine power dropped. In addition cooling valve lost access to the temperature will rise substantially, serious valve can Shaorong. Valve in the rotation, the Tappet also together with the rotation, so that the tappet cam and contacts constantly changing, this can prevent the Tappet local surface wear and enhancing the Tappet life.

For these reasons, the valve must be used circular structure. However, the limited area of the combustion chamber, in order to increase the valve open area, it should be optional oval-shaped valve. At present in a number of technical departments are discussing this issue, but did not see this kind. In this regard, will be back in the chapter for further discussion.