![]() ![]() To increase the contact pressure between the ring and the liner surface, the rings can have chamfered edges on either the outer sides of the lands or facing the combustion chamber to reduce the oil consumption through improved oil scraping from the bore. Oil rings can be one-piece or two pieces. In the oil ring, holes or slots are cut into the radial centre of the ring which allows the excess oil to flow back to the reservoir. Related Read: Intelligent Cylinder Lubrication for Modern Marine Engines These rings do not allow the oil to pass from the space between the face of the ring and the cylinder. These rings are also called scraper rings as they scrap the oil off the cylinder walls and send back to the crankcase. The oil is splashed onto the cylinder walls. These rings are also used to spread the oil evenly around the circumference of the liner. The oil control rings control the amount of lubricating oil passing up or down the cylinder walls. This is caused by the wiper ring wiping excess oil toward the combustion chamber. If the wiper ring incorrectly installed with the tapered angle closest to the compression ring, it results in excessive oil consumption. Related Read: How Internal Forces in Marine Engines Affect Their Operation? Most of the wiper rings have a taper angle face which is positioned toward the bottom to provide a wiping action as the piston moves toward the crankshaft. Their main function is to clean the liner surface off the excess oil and to act as support back up ring on stopping any gas leakage further down which escaped the top compression ring. ![]() The wiper ring also called a Napier ring, or backup compression ring, are installed below the compression ring. Moreover, it also provides help to the top compression ring in sealing and heat transfer. ![]() The oil is controlled by shearing the layer of the oil left by oil ring, thus providing the top compression rings enough lubrication. The primary function of these rings is to seal the combustion gases and transfer heat from the piston to the piston walls. However, this may differ according to the design of the engine. The compression rings are located in the first grooves of the piston. The compression rings provide sealing above the piston and prevent the gas leakage from the combustion side.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |