Giving bearings a longer life cycle
26
2023
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01
The difference between rolling bearings and plain bearings
As an indispensable part of mechanical products, bearings are categorized into rolling friction bearings (referred to as rolling bearings) and sliding friction bearings (referred to as sliding bearings) according to the friction performance of bearings.Bearing in the structure of each has its own characteristics, each has its own advantages and disadvantages.When selecting them, practical considerations must be taken into account.
As an indispensable part of mechanical products, bearings are categorized into rolling friction bearings (referred to as rolling bearings) and sliding friction bearings (referred to as sliding bearings) according to the friction performance of bearings.Bearings have their own structural characteristics, and each has its own advantages and disadvantages.When choosing, it is necessary to combine practical considerations.
Comparison of the performance of rolling bearings and plain bearings
Comparison of structure and motion
The most obvious difference between a rolling bearing and a plain bearing is the presence or absence of rolling elements.
Rolling bearings have rolling elements (balls, cylindrical rollers, tapered rollers, needles) that rotate to support the axis of rotation so that the contact part is a single point, and the more rolling elements there are, the more contact points there are.
Sliding bearings have no rolling elements and support the rotating shaft by means of smooth surfaces, making the contact part a surface.
The difference between the two constructions determines that rolling bearings move in a rolling manner and plain bearings move in a sliding manner, so that the friction situation is completely different.
Comparison of load carrying capacity
Generally speaking, the load carrying capacity of a plain bearing is generally higher than that of a rolling bearing due to its large carrying area, which cannot withstand shock loads, but a fully lubricated bearing can withstand cushioning and absorption of the lubricant film.Shock loads are large.When the speed is high, the centrifugal force on the rolling elements in a rolling bearing increases and the load carrying capacity decreases (noise is likely to occur at high speeds).In the case of dynamic plain bearings, the load carrying capacity increases with increasing speed.
Comparison of coefficient of friction and starting friction resistance
Under normal operating conditions, the coefficient of friction of rolling bearings is lower than that of plain bearings and the value is relatively stable.The lubrication of plain bearings is easily influenced by external factors such as speed and vibration, and the coefficient of friction varies considerably.
At start-up, the resistance of plain bearings is greater than that of rolling bearings because they do not form a stable oil film, but static plain bearings have a small start-up frictional resistance and a small coefficient of operating friction.
Comparison of applicable working speeds
Rolling bearings are limited by the centrifugal force of the rolling elements and the rise in bearing temperature.The speed can not be too high, generally applicable to low and medium-speed working conditions.Bearings with incomplete liquid lubrication cannot be operated at too high a speed due to bearing heat and wear.The high speed performance of fully liquid lubricated bearings is very good, especially when hydrostatic plain bearings are used with air as the lubricant, speeds of up to 100,000r / min can be achieved.
Other comparisons
Rolling bearings use oil, grease or solid lubricant with low dosage, high oil volume at high speeds, oil quality requires cleanliness, so they need to be sealed, but the bearings are easy to replace and generally do not require repair logs.For plain bearings, except for bearings with incomplete liquid lubrication, the lubricant is usually liquid or gas, the amount is large, and the oil quality is clean, the bearing bushings need to be replaced frequently, and sometimes the journal needs to be repaired.
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