**Rolling Elements: English and Chinese Terms with Comparison**
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*Source: China Bearing Network | Date: August 7, 2014*
This article provides a detailed explanation of the terminology related to rolling elements used in bearings. Understanding these terms is essential for anyone working with mechanical systems, especially in engineering and manufacturing fields.
1. **Ball (Ball)**
A spherical rolling element used in ball bearings. It allows smooth rotation by minimizing friction between moving parts.
2. **Roller (Roller)**
A cylindrical or conical rolling element with a symmetrical axis and circular cross-section. It is commonly used in roller bearings to support loads efficiently.
3. **Ball (Roller) Set / Ball (Roller) Group**
Refers to all the balls or rollers present in a specific bearing. These elements work together to distribute load evenly across the bearing.
4. **Cylindrical Roller**
A type of roller where the outer surface is straight and parallel to the axis. It is ideal for high radial load applications.
5. **Needle Roller**
A small-diameter cylindrical roller with a high length-to-diameter ratio, typically between 3 to 10 times the diameter. It is often used in compact designs where space is limited.
6. **Tapered Roller**
A conical-shaped roller with a straight line on its surface that intersects the axis. It is designed to handle both radial and axial loads simultaneously.
7. **(Convex) Ball / Convex Roller**
A roller whose outer surface is curved outward in the plane containing its axis. This design helps reduce stress concentration at contact points.
8. **Concave Roller**
A roller with a concave shape on its outer surface in the plane that includes its axis. It is often used in specialized bearings for unique load distribution needs.
9. **Symmetrical Spherical Roller**
A spherical roller that is symmetrical about the plane passing through its center. It is commonly used in self-aligning bearings.
10. **Asymmetrical Spherical Roller**
A roller with a non-symmetrical shape, where the outer surface is curved but not symmetrically aligned on either side of the axis.
11. **Convex Roller**
A roller with a slightly curved outer surface along the axis. This design helps prevent stress concentration at the ends and improves contact with the raceway.
12. **Recessed Roller (Rounded End)**
The end of the roller is slightly rounded to avoid stress concentration at the contact area between the roller and the raceway.
13. **Spiral Wound Roller**
A roller made by winding steel wire into a spiral shape. It is often used in special applications where traditional shapes are not suitable.
14. **Roller End Face**
The flat surface at the end of a roller, perpendicular to its axis. It plays a role in maintaining alignment within the bearing.
15. **Large End Face (Tapered Roller)**
Refers to the larger end face of a tapered roller or an asymmetrical spherical roller, which is often used for axial load support.
16. **Small End Face (Tapered Roller)**
The smaller end face of a tapered roller or an asymmetrical spherical roller, typically found on the narrower side of the roller.
17. **Chamfered Roller**
A roller with a beveled edge at the end, helping to reduce stress and improve performance under load.
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**Related Bearing Knowledge**
- The concept and development history of gas bearings
- SKF agricultural Y-bearing: features and advantages
- SKF single-row angular contact ball bearing suffix meanings
- Basic production process of four-row cylindrical roller bearings in imported rolling mills
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For more information, visit [China Bearing Network](http://www.chinabearing.net).
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