(1) Gas Lubricant
Gas is also a lubricant, by way of dynamic pressure or hydrostatic pressure from the gas film will have sufficient friction surface spaced deputy campaign and withstand external loads, thereby reducing friction and surface wear during exercise. The gas is mainly used as a lubricant air can also be used as nitrogen, helium, carbon monoxide and water vapor. Important characteristics of gases are: viscosity of the liquid 1/100 to 1/1000, and compressible.
A support member using a gas lubricant has the following advantages:
1) friction is small, at high speed heat, low temperature, flexible operation;
2) a wide operating temperature range;
3) gas lubricating film to be much thinner than the liquid lubricant film, the gas-bearing gap can be kept small, easily support high-speed rotation to obtain a higher precision;
4) can work in a radioactive environment or other special environment, energy and other effects from radiation;
5) does not degenerate, will not cause order on the support element and the surrounding environment pollution.
Inadequate gas-bearing elements:
1) low carrying capacity, poor rigidity;
2) There must be an external source of gas supply of clean, dry gas;
3) Dynamic stability is poor, prone to self-oscillation or half-speed whirl;
4) manufacturing precision and surface roughness of the support element higher;
5) higher exhaust noise.
(2) Lubricants
That is the amount of lubricating oil is a liquid lubricant, the largest species of lubricant base oil and additive system posed, including mineral oil-based lubricants, synthetic lubricants, animal and vegetable oil three categories. Among them, the largest amount of mineral oil-based lubricants, accounting for over 90% of all liquid lubricant. Viscosity liquid lubricant has a wide range of friction and moving parts under different load, speed and temperature conditions of work Tigong a wider choice. Liquid lubricant also has a low, stable friction coefficient and low compressibility, and can effectively remove heat from the friction surface, dimensional stability and equipment to ensure the accuracy of the relative moving parts, and is rich in resources, mostly inexpensive products, easily available. In particular, where you can also add a certain amount of additives to improve their physical and chemical properties of the lubricating oil to give new special features, or enhance some of its original performance, to meet the higher requirements.
