When needs to select one kind of lubricant for the product, first should be clear about the role which the lubricant plays: Anti-friction, deafen, protection, seal and so on.The anti-friction lubricant, should consider bears the high low temperature the scope, the load and the rotational speed and so on; The deafen lubricants, should consider adhesion, temperature range, load and rotational speed and so on; The protection lubricant, should consider to the metal, the nonmetallic protection and the compatibility; The packing grease, should consider and seal the material quality compatibility.Also should does not come together according to the product lubrication spot structure and the environment operating mode selects the lubricant, synthesizes mainly has following several targets:
1. Operating temperature: Is lubricated the spot the lowest operating temperature to be supposed to be higher than the lubricant the low temperature boundary, otherwise can enlarge the resistance; The maximum temperature should be lower than the lubricant the high temperature boundary, otherwise can lose the lubricity because of the lubricant outflow; The common lubricant is suitable the temperature to be supposed high to be lower than its drop out point 20~30℃.
2. Operating speed: Lubricates the part the operating speed to be higher, the lubricant receives the shear stress is bigger, also turns high speed the part temperature rise is quick, easy to cause the lubricant to change thin drains, therefore uses the thickness big lubricant elected.
3. Load bearing load: Selects the lubricant according to the load is guaranteed one of lubrication keys, uses the base oil viscosity elected regarding the heavy load lubrication points high, the gelatinizer content high lubricant; If both withstands the heavy load and the withstanding impact load, then should select has the high ep and the abrasion resistant lubricant, if includes the molybdenum disulfide lubricant.
4. Use operating mode: The environmental condition is refers to the lubrication points the working conditions with the environmental media, like air humidity, dust and whether has the corrosive medium and so on.In the moist environment or in the water contact situation, may select the water resistance good lubricant.If calcium base, lithium base; When condition harsh, elected has the rust prevention lubricant with Canada, but selects the water resistance difference not suitably the sodium base fat; Occupies has in the intense chemistry medium environment lubrication points, uses the anti-chemistry medium elected the fluorine lubricant and so on; Under dust many environment, may select thickly thick includes the graphite lubricant; Seals has the special request, uses the sodium base lubricant elected.
5. Cost element: When selects the lubricant, but also must consider when use the efficiency, the generalized analysis uses this lubricant whether later lengthened the lubrication cycle, the replenishment number of times, the fat consumption, the bearing failure rate and the maintenance cost and so on.
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