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details Main use
Automobile grease is mainly used for automobile tire bearing grease and automobile chassis node grease, such as cross shaft grease, rotating shaft grease and so on。Because the grease is a solid or semi-fluid lubricant, it is suitable for the lubrication of automotive parts that can not use the circulation system lubrication method。
Automobile grease is called unsalted butter, which is a common name for calcium based grease。Grease is a semi-fluid or solid lubricating raw material made by adding thickener or other ingredients to a liquid lubricant (base oil)。The type and amount of base oil and thickener have key hazards to the performance indicators of grease. In order to achieve some or some performance indicators of grease well, multi-purpose preservatives or structural amendments are usually added to the grease。Greases exhibit solid properties at low loads, begin to plastic deform at a critical load, and return to solid when the load is removed。
归类
There are a variety of grease types, and countries around the world widely divide grease models according to cone penetration, from 00, 7, 2...Class 11。
The drop point and cone penetration are the key chemical components of the grease binomial, and the drop point is the grease that never flows to the beginning of flow after heat.Low temperature, commonly used to indicate the heat resistance of grease。The drop point of the grease should generally be 30 to 40 ° C higher than the operating temperature。Coning degree is an index value that reflects the consistency or hardness and softness level of grease mortar. The greater the coning value, the lower the mortar consistency of grease, that is, the softer the grease is, the smaller the model of grease is, and the opposite is large。If the mortar consistency (strength) of No. 2 grease exceeds that of No. 2 grease。On the car.The common grease is the general lithium grease for automobiles, which can be used for automobile tire bearings and other positions in automobiles。Automotive general lithium grease has excellent high and low temperature test performance index, excellent serviceability, excellent air oxidation stability and moderate water solubility resistance。Because the load of the tire bearing of the medium and heavy duty truck is large, the wheel at this stage胎Bearing grease should be replaced by compound lithium grease with stronger fire resistance hydraulic oil characteristics。In the work of the car constant speed universal joint, the standard is relatively strict, and the polyurea grease or lithium molybdenum disulfide grease with good temperature resistance and load resistance are used。
Although the use of grease is not as large as engine oil and car oil, its main uses are wide, there are many kinds, and in some places, lubricating oil can not be replaced, so it is a major category of automotive lubricants。
特性
A good grease should have the following characteristics: wide available temperature range, good load resistance，Moderate use，Not easy to divide oil，Different structures should be maintained，Not easy to change in the application，The original reasonable characteristics can be maintained after infiltration of a small amount of residue;Good cutting stability，After exposure to cutting efficiency and operating temperature hazards，The change of its quality standards does not exceed some categories;It is not easy to harden at ultra-low temperature;With excellent anti-corrosion and anti-rust treatment effect。
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