时间：2011-03-11 23:18来源：蓝天飞行翻译 作者：航空 点击：次
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oil-damped bearing (gas turbine component). A type of roller bearing installation in a gas turbine engine in which the outer race is installed in an oil damper compartment whose inside diameter is a few thousandths of an inch larger than the outside diameter of the outer race. Oil under pressure fills the oil damper compartment and allows the bearing to compensate for sight misalignment and to absorb vibrations of the shaft. oil dilution (reciprocating engine operation). A method of treating the lubricating oil to make it possible to start a reciprocating engine when the temperature is very low. When the oil gets cold, it becomes thick and hard to move, making it difficult for the starter to turn the engine over fast enough for it to start. Before shutting the engine down, enough gasoline from the fuel system is mixed with the lubricating oil to dilute it, so the starter can turn the engine over when the oil is cold. When the engine starts and the oil warms up, the gasoline evaporates from it. The oil is not damaged by diluting it. Oil dilution is no longer needed because multiviscosity oil is thin enough at low temperature to allow the engine to start. oil filter (lubrication system component). A device in the lubrication system of either a reciprocating engine or a gas turbine engine that removes contaminants suspended in the oil. oil hardening (metal heat treatment). A method of hardening steel by heating it red-hot and then quenching it in a bath of oil. Oil cools the steel more slowly than either water or brine and gives it a uniform hardness. oilite bushing. A type of self-lubricating bushing. Oilite bushings are made of a porous bronze material impregnated with oil. They can be pressed into holes to decrease the resistance to shafts turning in the holes. When a shaft turns in an oilite bushing, it produces heat that brings the oil to the surface and provides lubrication between the bushing and the shaft. Oilite bushings must never be washed, as washing removes the oil. oil jet (lubricating system component). A small nozzle which directs a stream of lubricating oil to a specific point to be lubricated. Oil jets are used to direct oil to bearings and gears. oil pan (reciprocating engine component). The removable lower part of the crankcase of a reciprocating engine. Engine lubricating oil is collected and stored in the pan and is taken from the pan by the pressure pump and forced through passages in the engine. Gravity then drains the oil back into the pan. An oil pan is commonly called an oil sump. oil pressure indicator (aircraft engine instrument). An instrument used to show the pilot or flight engineer the pressure of the lubricating oil being delivered to the engine bearings. oil scraper ring (reciprocating engine component). Another name for an oil wiper ring. See oil wiper ring. oil screen (lubricating system component). A fine-mesh wire screen used inside an engine lubricating system to trap contaminants suspended in the lubricating oil. A screen is not as effective as a filter, and many engines use both screens and filters. |
