The selection of grease for sliding bearings (bronze bushings) is very important, as it directly affects the service life, performance and working efficiency of the bearings. The selection of grease needs to consider the following aspects:
1. Type of grease
Common greases for sliding bearings are mainly:
Calcium-based grease: Suitable for applications at room temperature and low loads. It has good water resistance, but low load-bearing capacity.
Lithium-based grease: A common grease suitable for medium temperature and load conditions. It has good water resistance, oxidation resistance and high temperature performance.
Aluminum-based grease: It has good load-bearing capacity and is suitable for working conditions with high temperature and high load.
Polyurea-based grease: Suitable for high temperature environments, with excellent anti-wear and anti-oxidation properties, but the price is high.
2. Viscosity selection
The viscosity of the grease affects its distribution and film thickness inside the bearing. Too low viscosity may cause the lubricating film to rupture, resulting in bearing wear; while too high viscosity may cause startup difficulties and energy loss. The appropriate viscosity needs to be selected according to the speed, load and temperature of the working environment.
3. Operating temperature range
When choosing a grease, you need to consider the operating temperature. Different types of grease have different temperature adaptability ranges. For example, lithium-based greases are usually suitable for temperatures ranging from -20°C to 120°C, while some special greases may be suitable for higher temperatures.
4. Anti-wear and extreme pressure performance
For applications with high loads or frequent load changes, it is very important to choose a grease with good anti-wear and extreme pressure properties. Adding extreme pressure additives (such as molybdenum disulfide, phosphate esters, etc.) can improve the performance of the grease under high loads and reduce wear.
5. Water resistance and corrosion resistance
If there is moisture or humid conditions in the working environment, it is crucial to choose a grease with strong water resistance and corrosion resistance. Calcium-based or aluminum-based greases have good water resistance, while lithium-based greases have a better effect on corrosion protection.
6. Additive selection
In order to improve the performance of the grease, you can choose to add some specific additives, such as:
Antioxidants: Improve the oxidation stability of the grease and extend its service life.
Corrosion inhibitors: prevent rust or corrosion on the surface of bearings and bushings.
Extreme pressure additives: increase the load-bearing capacity of grease, suitable for high-load and high-pressure working environments.
7. Brand and quality
There are many grease brands on the market. When choosing, you can refer to some reputable brands to ensure the quality and performance of the grease. Well-known brands of grease usually have higher standards in quality control and formulation.
According to the specific application and working conditions of the sliding bearing, choosing the right grease can significantly improve its operating efficiency, reduce wear and extend its service life. If there are specific application conditions or requirements, further detailed information can be provided to make more accurate recommendations.
