Rolling Bearing Types and Codes
Source: China Bearing Network | Date: 2013-07-12
Rolling bearings are essential components in machinery, designed to support rotating shafts and reduce friction. Depending on the application, different types of bearings are used to meet specific operational needs. Bearings can be broadly classified into ball bearings and roller bearings based on the shape of the rolling elements. Additionally, they can be categorized as radial bearings or thrust bearings depending on the direction of the load they carry. When selecting a rolling bearing, several factors should be considered: **1. Load Characteristics:** Ball bearings are typically suitable for light loads, while roller bearings are better for heavy or impact loads. For pure axial loads, thrust bearings are commonly used. If the load is primarily radial, deep groove ball bearings or short cylindrical roller bearings are ideal. When both radial and axial loads are present, angular contact ball bearings, tapered roller bearings, or self-aligning bearings may be appropriate. In cases where high axial loads are expected, bearings with a larger contact angle, such as angular contact ball bearings or tapered roller bearings, are recommended. In some applications, a combination of radial and thrust bearings may be necessary. **2. Speed:** Different bearing types have varying speed capabilities. Bearings that generate less friction and heat are more suitable for high-speed operations. It's important to ensure that the selected bearing operates below its maximum allowable speed to avoid overheating and premature failure. **3. Rigidity:** Bearing rigidity refers to its ability to resist deformation under load. Pre-loading the bearing can improve its stiffness. Proper arrangement and combination of bearings can also enhance overall rigidity, especially in precision applications. **4. Self-Alignment and Mounting Errors:** In some cases, misalignment or errors in the housing can cause uneven loading and early failure. Self-aligning bearings are designed to accommodate these issues, making them ideal for applications where alignment is challenging. **5. Installation and Maintenance:** Some bearings, like tapered roller bearings and needle bearings, are designed for easy installation and removal. Bearings with separable inner and outer rings allow for simpler maintenance and replacement. **6. Availability:** Bearings that are listed in standard catalogs are usually available in the market. However, custom or non-standard bearings may require special ordering. It’s important to confirm availability before finalizing a selection. **Rolling Bearing Codes:** The bearing code is a standardized system used to identify the type, size, and specifications of a bearing. According to GB/T 272-93, the code consists of three parts: the basic code, the prefix code, and the suffix code. The basic code indicates the bearing type, size series, and inner diameter. The size series code includes two digits that represent the width (for radial bearings) or height (for thrust bearings) and the diameter series. The inner diameter code specifies the nominal bore size. For example: - **23224**: Spherical roller bearing, size series 32, inner diameter code 24 (d = 120mm). - **6208-2Z/P6**: Deep groove ball bearing, size series 2, inner diameter code 08 (d = 40mm), with shields on both sides and precision grade P6. Understanding bearing codes is crucial for proper selection and identification, ensuring the right component is used for the intended application. --- **Related Articles:** - "Rolling Bearing" Production Process Overview - Detailed Analysis of Thrust Spherical Roller Bearings - FAG Imported Bearing Selection Guidelines This article was originally published on China Bearing Network. Link: http:// Please cite the source: China Bearing Network – http:// Previous: Importance of Import Bearings Next: Causes of Fan Bearing Issues and Cleaning Methods
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