No coin nor oath required. For personal study only.
a valve assembly for an internal combustion engine. A valve assembly for an internal combustion engine generally includes a valve spring and a valve seal with a retainer. Before the valve spring and the retainer fit into place, a valve seal is usually positioned over a valve stem. Valve-stem seals control the amount of oil allowed between a valve stem and a valve-stem guide. The seal functions in the manner of a positive seal, or umbrella seal, to prevent oil from flowing down the valve stem into the combustion chamber. The spring, which normally acts to keep the valve closed, is held in place by an individual retainer that is secured onto the valve stem. Such retainers typically prevent the valve spring from wearing into the engine-head surface. A rockercover gasket is separately provided to further ensure against lubricant flowing into the combustion chamber. However, individual valve-stem seal assemblies and rocker-cover gaskets are undesirable, because of the increased
๐ SIMILAR VOLUMES
This patent covers a hybrid arrangement of abradable labyrinth seal sections alternating with damper seals. The labyrinth comprises the teeth (12) and abradable material (13). In between sections of labyrinth are the damper seals. The damper seal is made from nonabradable material. Three different t