Should bearings be selected in this way?

Bearings are supporting components for the rotating shafts or movable parts of various machinery, widely used in agricultural machinery such as agricultural vehicles, tractors, diesel engines, electric motors, and threshers. Common bearing codes are commonly used for selecting bearings, but bearing codes are quite complicated. If the agricultural machinery palm grasps the pattern of identifying bearing codes, the selection will be easy.

The commonly used bearings are some standard models, with the code "0" and tolerance grade "G" (ordinary grade). The first section of the general bearing can be omitted, so its code is mostly represented by the seven digits of the basic code. Here is an example to illustrate the meaning of bearing code: Example 7002136 (135 series diesel engine shaft main bearing), its basic code is identified from right to left. The two digit number "36" represents the inner diameter, and its calculation method is 36 × 5=180 millimeters; '1' represents the diameter series ultra light weight; 2 "indicates that the type is cylindrical roller bearing; '00' indicates that the outer ring of the bearing structure has no blocking edge; 7 "indicates that the width series is narrow. If the operator chooses a 7-digit bearing code for other standard models, this type of recommendation can be used.

When choosing bearings, refer to the inner diameter of the bearing. The inner diameter of the bearing is represented by the first and second digits on the right side in the basic code. The bearing inner diameter is divided into standard and non-standard inner diameters, and the difference between non-standard inner diameters is not an integer or a multiple of 5. For the convenience of machine operators, here is an example to illustrate: 1. For bearings with an inner diameter of less than 9 millimeters, the actual size is represented by the first digit on the right end. For example, bearing number 18 has an inner diameter of 8 millimeters. 2. The inner diameter of the bearing is expressed as a fixed number between 10mm and 17mm. For example, bearing numbers 100, 201, 302, and 403 have inner diameter codes with the right two digit numbers 00, 01, 02, and 03, respectively. Their inner diameters are represented by fixed numbers of 10, 12, 15, and 17 millimeters. 3. The inner diameter of the bearing ranges from 20mm to 480mm (excluding 22, 28, and 32), expressed as the quotient of the inner diameter size divided by 5. 4. The inner diameter of bearings above 500 millimeters (22, 28, 32) is expressed as a fraction, with the denominator representing the inner diameter and the numerator representing the size series, type, and structural form of the bearing. For example, bearings 30031/560 have an inner diameter of 560 millimeters, and so on.