The difference between lubricating grease and lubricating oil

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The difference between lubricating grease and lubricating oil

Grease is a thick oil-like semi-solid, with good lubrication, plasticity and a certain adhesion. Lube and seal; also fill void and prevent rust. Mainly composed of mineral oil (or synthetic lubricants) and thickagents.

The lubricating oil is composed of base oil and additives, which has the functions of lubrication and grinding reduction, auxiliary cooling, sealing and leakage prevention, rust and corrosion prevention, shock absorption and buffer. Known as the "blood" of cars.

What are the advantages and disadvantages of grease and lubricating oil, and how to choose between them? Can my car use grease instead of grease. Today I will take you to summarize.

merit

Admittedly, the grease is simple, simple simple, and long and less replacement times. Grease is more economical, the price is much cheaper than lubricating oil. However, it is not recommended to replace lubricating oil with grease here, because grease is mostly used for industrial equipment parts lubrication. But from the price ratio, grease than lubricating oil add fat less times, more economical.

Because grease is grease semi-solid, so compared with the lubricating oil, it is difficult to flow out, difficult to drop, less splash, can prevent the dirt of mechanical products, has a strong sealing effect, can prevent the mixing of dust and other foreign bodies.

Because the fatty acid soap in grease can form an adsorption layer on the metal surface, it is durable under severe conditions such as high temperature, extreme pressure, low speed, impact, intermittent operation, and bearings with changing rotation direction. It is more applicable for mechanical parts that are difficult to fill, for long-term standing and continuous use; for complex working environment in a wide temperature range or in places with a wide temperature range.

shortcoming

The friction resistance in grease is large, so it is not suitable for use in high speed precision micro bearings. And the cooling dissipation is poor, the general temperature is slightly higher.

Poor fluidity, unable to form a dynamic pressure oil film, so it is not suitable for most sliding bearings. And the grease filling, replacement, cleaning and other operations are some difficult, the storage process is easy to deteriorate, pollution can not be purified.

In general, lubricating grease has different characteristics compared with lubricating oil. Grease cannot replace lubricating oil in some conditions, but in many working conditions, the advantages and benefits of replacing lubricating oil cannot be denied.