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Basic knowledge of bearings

Views:3     Author:Site Editor     Publish Time: 2020-11-11      Origin:Site


Why choose rolling bearings?

Rolling bearings support and guide the rotation or oscillation of the machine with minimal friction and transfer loads between machine components such as axles, axles or wheels. The high-precision and low-friction characteristics of rolling bearings can achieve high speeds while reducing noise, heat, energy consumption and wear.


Ball bearings and roller bearings

Two basic types of rolling elements are used to distinguish the two basic types of rolling bearings:

• Ball → Ball Bearing

• Roller → Roller bearing

The difference between balls and rollers is the way they contact the raceway.

Ball makes point contact with the raceway of the bearing ring. As the load acting on the bearing increases, the contact point becomes an elliptical area. The small contact area results in low rolling friction, so that the ball bearing can adapt to high-speed operation, but its carrying capacity is limited.

Roller makes line contact with the raceway of the bearing ring. As the load on the bearing becomes larger, the contact line becomes rectangle. As the contact area becomes larger and the resulting friction becomes larger, compared with ball bearings of the same size, roller bearings can withstand heavier loads, but speed is low.


Radial bearings 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 loads, while most radial bearings can also bear axial loads in one direction. In some cases, they can also bear axial loads in two directions.

• Thrust bearings

Thrust bearings mainly bear loads along the axial direction. According to its design, thrust bearings can support one-way or two-way pure axial loads, and some can bear additional radial loads (combined loads). Thrust bearings cannot achieve the same high speed as radial bearings of the same size.


Contact angle determines which category the bearing belongs to. Bearings with a contact angle of ≤ 45° are radial bearings, and others are thrust bearings.

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