Selection of sliding bearing grease

1. Sliding bearings can also be lubricated with grease. The following points should be considered when selecting grease:
1) When the bearing load is large and the speed is low, the grease with a small penetration degree should be selected, and vice versa. High-speed bearings use grease with a small degree of penetration and good mechanical stability. Special attention is paid to the lower viscosity of the base oil of the grease.
2) The dropping point of the selected grease is generally higher than the working temperature of 20-30 ° C. In the case of continuous operation at high temperature, be careful not to exceed the allowable operating temperature range of the grease.
3) When the sliding bearing works in water or humid environment, it should choose calcium-based, aluminum-based or lithium-based grease with good water resistance.
4) Select a grease with good adhesion.
2. Selection of grease for sliding bearings:
The load is <1MPa, the circumferential speed of the journal is less than 1m/s, the maximum working temperature is 75°C, and the calcium base grease No. 3 is used;
The load is 1-6.5MPa, the circumferential speed of the journal is 0.5-5m/s, the maximum working temperature is 55°C, and the calcium base grease No. 2 is used;
The load is >6.5MPa, the circumferential speed of the journal is less than 0.5m/s, the maximum working temperature is 75°C, and the calcium base grease No. 3 is used;
The load is <6.5MPa, the circumferential speed of the journal is 0.5-5m/s, the maximum working temperature is 120°C, and the No. 2 lithium grease is used;
The load is >6.5MPa, the circumferential speed of the journal is less than 0.5m/s, the maximum working temperature is 110°C, and the calcium-sodium grease of No. 2 is used;
The load is 1-6.5MPa, the circumferential speed of the journal is less than 1m/s, the maximum working temperature is 50-100°C, and the No. 2 lithium grease is used.
Load >5MPa The circumferential speed of the journal is 0.5m/s, the maximum working temperature is 60°C, and the No. 2 calendering grease is used;
Calcium-sodium based grease should be considered in a humid environment at temperatures between 75 and 120 °C. In a humid environment, the working temperature is below 75 ° C, there is no calcium base grease No. 3, and aluminum base grease can also be used. When the working temperature is 110-120 ° C, lithium base grease or sulfhydryl base grease can be used. When concentrated lubrication, the consistency is smaller.
3. Lubrication cycle of grease for sliding bearings:
Accidental work, unimportant parts: shaft speed <200r/min, lubrication cycle 5 days; shaft speed >200r/min, lubrication cycle 3 days.
Intermittent operation: shaft speed <200r/min, lubrication cycle once every 2 days; shaft speed>200r/min, lubrication cycle once every day.
Continuous operation, working temperature is less than 40 °C: shaft speed <200r/min, lubrication cycle once every day; shaft speed>200r/min, lubrication cycle once per shift.
Continuous operation, working temperature 40-100 °C: shaft speed <200r/min, lubrication cycle once per shift; shaft speed >200r/min, lubrication cycle twice per shift.

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Key points for applying force when assembling and dismounting bearings

(1) The force of the applied force passes through the axis of the bearing as much as possible, which requires that the point of application of the force is uniformly symmetrical and stable, and the force is applied through the spherical surface or parallel to the axis.
     (2) The size of the force should be smooth and uniform, and it is not suitable for impact. This requires the use of oil pressure or a tool that can apply a smooth pulling force or pressure. When it is necessary to use hammering, it must also be soft through a copper sleeve. It is buffered without falling metal, and the tapping force is as gentle as possible. It is best to use a copper rod or a copper hammer for hammering.
     (3) Avoid applying force through the rolling element. This requires the force applied through the inner ring when the inner ring (shaft ring) is removed or removed, and the force is applied through the outer ring when the outer ring is assembled or removed.
     (4) The drag force should be continued to the extent that it should be, for example, when installing the bearing, stop the force when the bearing is just in the correct position, and ensure that the end face of the ferrule (gasket) abuts against the seat hole or the shoulder end face of the shaft. Can not be squeezed too tightly, and can not be installed.

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