Bearings are supports for various mechanical rotating shafts or movable parts, and are widely used in agricultural machinery such as agricultural vehicles, tractors, diesel engines, electric motors, and threshers. Buying bearings commonly used bearing code, but the bearing code is more complicated, if the agricultural machine masters the law of identifying the bearing code, the purchase is easy.
Generally, the common bearings are some standard models, codenamed “0â€, tolerance class is “G†(normal grade), the first section of the general bearing can not be written, so the code number is mostly represented by 7 digits of the basic code. Now give an example of the meaning of the bearing code: Example 7002136 (135 series diesel engine shaft main bearing), the basic code is identified from right to left. The "36" two-digit number means light inside, and the calculation method is 36×5=180 mm; “1†means the diameter series is extremely light; “2†means the type is cylindrical roller bearing; “00†means the bearing structure form outer ring. No ribs; "7" indicates that the width series is narrow. If the operator buys 7-digit other standard model bearing code, it can be deduced.
The inner diameter of the bearing is multi-referenced. The inner diameter of the bearing is indicated by the first and second digits in the right code in the basic code. The inner diameter of the bearing is divided into standard and non-standard inner diameters, and the difference between the non-standard inner diameter is not an integer or an integral multiple of 5. In order to facilitate the purchase of the machine, an example is given:
1 The inner diameter of the bearing below 9 mm is indicated by the actual size of the first digit on the right end. For example, bearing number 18 has an inner diameter of 8 mm.
2 bearing inner diameter is expressed in fixed numbers of 10-17 mm. For example, bearing numbers 100, 201, 302, and 403 have inner diameter codes of 00, 01, 02, and 03, respectively, and their inner diameters are fixed numbers of 10, 12, 15, and 17 mm, respectively.
3 bearing inner diameter is 20-480 mm (except 22, 28, 32), expressed as the number of inner diameter divided by 5.
4 bearing inner diameter is more than 500 mm (22, 28, 32) expressed in fractions, denominator indicates inner diameter, and numerator indicates bearing size series, type and structural form. For example, bearing 30031/560 has an inner diameter of 560 mm, and so on.