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Ball bearings and roller bearings
The two basic types of rolling body are different from the two basic types of rolling bearing:
Ball → ball bearing
Roller → roller bearing
The difference between a ball and a roller is the way it touches the raceway.
The ball makes point contact with the raceway of the bearing ring . As the load applied to the bearing increases, the point of contact becomes an ellipse. The small contact area can reduce the rolling friction, so that the ball bearing can adapt to the high speed while limiting its bearing capacity.
Linear contact between roller and raceway of bearing ring . As the load applied to the bearing increases, the contact line becomes a rectangle. Due to the larger contact area and the resulting greater friction, roller bearings can withstand heavier loads at lower speeds than ball bearings of the same size.
Radial and thrust bearings
Rolling bearings are divided into two categories according to the main load direction:
Radial bearing
The radial bearing can bear the load perpendicular to the shaft. Some radial bearings can only bear pure radial load, while most radial bearings can also bear axial load in the same direction, and in some cases, axial load in both directions.
Thrust bearing
Thrust bearing mainly bears the load along the axial direction. According to their design, thrust bearings can support single-phase or bidirectional pure axial loads ), and some can bear additional radial loads (combined loads,. Thrust bearings cannot reach the same high speed as radial bearings of the same size.
The contact Angle determines which class the bearing belongs to. Bearings with contact Angle ≤ 45° are radial bearings and others are thrust bearings.
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