Rolling Bearing Types and Codes
Rolling bearings are essential components in machinery, designed to handle various working conditions. To meet specific application requirements, different types of bearings are available. Rolling bearings can generally be divided into two main categories based on the shape of the rolling elements: ball bearings and roller bearings. Additionally, they can be classified by the primary direction of the load they support—radial bearings for radial loads and thrust bearings for axial loads. When selecting a rolling bearing, several factors should be considered: 1. **Load Characteristics**: Ball bearings are typically used for light loads, while roller bearings are more suitable for heavy or impact loads. For pure axial loads, thrust bearings are preferred. If the shaft is subjected to both radial and axial loads, deep groove ball bearings, angular contact ball bearings, tapered roller bearings, or self-aligning bearings may be appropriate. For high axial loads, angular contact ball bearings or tapered roller bearings with larger contact angles are recommended. 2. **Speed**: Bearings have different speed capabilities. High-speed applications usually require bearings that generate less friction and heat. Always ensure the bearing operates below its maximum allowable speed. 3. **Stiffness**: The stiffness of a bearing depends on how much it deforms under load. Preloading can improve stiffness, as well as the arrangement and combination of bearings in the system. 4. **Self-Alignment and Installation Errors**: Bearings with self-aligning features can compensate for misalignment caused by installation errors or thermal expansion, making them ideal for applications where alignment is challenging. 5. **Ease of Installation and Removal**: Some bearings, such as tapered roller bearings and separable bearings, are easier to install and remove, which is beneficial for maintenance purposes. 6. **Availability**: Bearings listed in catalogs are usually available in the market, while others may be custom-made. It's important to choose bearings that are readily available to avoid delays. **Bearing Codes** The code of a rolling bearing is a combination of letters and numbers that describe its type, size, precision, and other characteristics. According to GB/T 272-93, the bearing code consists of three parts: the basic code, the prefix code, and the suffix code. - **Basic Code**: This indicates the bearing type, design, and dimensions. It includes the type code, size series code, and inner diameter code. - **Type Code**: Represents the bearing type (e.g., 6 for deep groove ball bearings, 2 for cylindrical roller bearings). - **Size Series Code**: Composed of two digits, indicating the width (for radial bearings) or height (for thrust bearings) and the diameter series. - **Inner Diameter Code**: Indicates the nominal inner diameter of the bearing. For example, in 6208, "08" represents an inner diameter of 40 mm. - **Prefix and Suffix Codes**: These are optional and used to specify special features, such as seals (e.g., 2Z), precision levels (e.g., P6), or other modifications. Understanding bearing codes helps in identifying the right bearing for a given application, ensuring proper performance and longevity. --- **Related Bearing Knowledge** - Detailed description of thrust spherical roller bearings - Analysis of auxiliary bearing types - FAG imported bearing selection guide For more information, visit [China Bearing Network](http://www.chinabearing.net). Previous: Importance of Imported Bearings Next: Causes of Fan Bearing Issues and Cleaning Methods
Low porosity clay bricks are made of low aluminum mullite as the main raw material, formed by high pressure molding and high temperature sintering. The main mineral composition is mullite phase, the product has excellent high temperature physical properties and chemical erosion resistance.
Low porosity clay brick stability is good, the degree of erosion does not occur sudden change, than ordinary clay brick life increased by 2 to 3 times. Thermal conductivity, specific heat and solubility, respectively, than ordinary clay bricks 2 times higher than 10% and 40%, heat storage capacity than ordinary clay bricks 50% to 60% higher than the thermal efficiency of the kiln can be improved.
Low porosity clay bricks are characterized by:
1. Low porosity, 13 to 15%;
2. Load softening temperature is high for about 1472 ℃;
3. High compressive strength at room temperature, generally about 100MPa;
4. Good volume stability at high temperature and good abrasion resistance;
5. good resistance to infiltration and erosion.
Low porosity clay brick as a good clay refractory brick products, so often used in chemical erosion, temperature fluctuations in the environment, such as steel, glass, chemical industry. The effect is quite obvious in the use of glass hot room and the use of iron water tank.
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