Measure the clearance of the outer ring of Timken bearing when the roller is sagging. First, ensure the upright attitude of Timken bearing, rotate the outer ring left and right for 1 / 2-1 turn, and any roller of the two rows of rollers is in the lower position respectively. Use a feeler gauge to measure the clearance. The measuring part is somewhat different according to the outer diameter of the bearing outer ring.INA Bearing Speed Vibration Solving Skills
Measurement of bearing clearance with outer diameter of outer ring greater than 200mm. Insert the feeler gauge between the two rows of rollers directly above the bearing and the outer ring, and between the two rows of rollers and the inner ring at the left-right symmetrical position relative to the bearing center, and measure the internal clearance of each bearing. INA Bearing Speed Vibration Solving Skills
The internal clearance r of Timken bearing is that the internal clearance measured between the two rows of rollers directly below the bearing and the outer ring is set as RS1 ` RS2 respectively, and the internal clearance directly above the bearing is set as rs. Rs = 1 / 2 (RS1 + RS2)
set the bearing internal clearance measured between the two rows of rollers and the outer ring at the left and right symmetrical positions relative to the bearing center and the clearance measured between the two rows of rollers on the left and the outer ring as RL1 ` RL2 respectively, and set the bearing internal clearance on the left as RL. RL = 1 / 2 (RL1 + RL2), set the measured clearance between the two rows of rollers on the right and the outer ring as R1 ` RR2 respectively, and the internal clearance of the bearing on the right as RR.
INA Bearing Speed Vibration Solving Skills
When inspecting Timken bearings, we must comply with relevant regulations. Let’s introduce the specific matters below.INA Bearing Speed Vibration Solving Skills
1、 Provisions on measurement area for the measurement of the inner diameter or outer diameter of Timken bearing, it is stipulated in China that the measurement is within the area with a large chamfer coordinate away from the south end of the ferrule, while it is mostly stipulated in foreign countries that the measurement is within the area with twice the chamfer coordinate away from the two ends of the ferrule.INA Bearing Speed Vibration Solving Skills
2、 The instrument used in the measurement must be calibrated and have the accuracy and magnification corresponding to the measured bearing.
3、 Probe radius and gauge pressure in order to reduce the measurement error, we must strive to reduce the pressure measuring force of the gauge and increase the radius of curvature of the probe within the possible range.INA Bearing Speed Vibration Solving Skills
4、 The provisions of dimension standard: when the comparative measurement method is used to measure the bearing dimension tolerance, the specified quantity block or standard part shall be used as the dimension standard for comparative measurement. The gauge block must comply with the provisions of the standard JB / t1078 gauge block, and the standard part must comply with the provisions of the competent department of the manufacturer.INA Bearing Speed Vibration Solving Skills
5、 Provisions for measuring datum plane for general Timken rolling bearings, the non printed end face of the ferrule is taken as the datum plane during measurement, and for angular contact ball bearings and tapered roller bearings, the end face bearing thrust load is taken as the datum plane.INA Bearing Speed Vibration Solving Skills
The speed that ina bearing can reach is limited. It usually depends on the operating temperature of the lubricant used and the material of the bearing components.
The speed at which the bearing reaches the operating temperature limit depends on the heat generated by friction (including any other external heat) and how much heat can be taken away from the bearing during rolling.INA Bearing Speed Vibration Solving Skills
The type and size, internal structure, load, lubrication and cooling conditions, cage structure, manufacturing accuracy and clearance of INA Bearing have a certain impact on the speed that the bearing can achieve.INA Bearing Speed Vibration Solving Skills
Two rated speeds with different definitions are usually listed in the relevant product table; Reference speed (related to heat) and limit speed (related to physical structure) are parameters determined according to different considerations.INA Bearing Speed Vibration Solving Skills
Most ina bearings are damaged for many reasons, such as exceeding the original estimated load, ineffective sealing, too small bearing clearance caused by too tight fit, etc. Any of these factors has its special damage type and will leave special damage traces. Therefore, by examining the damaged bearing, the possible causes can be found in most cases.INA Bearing Speed Vibration Solving Skills
Generally speaking, one third of ina bearing damage is caused by fatigue damage, another third is caused by poor lubrication, and the other third is caused by pollutants entering the bearing or improper installation and treatment. However, these types of damage are also related to industry.
For example, the pulp and paper industry is mostly due to bearing damage caused by poor lubrication or pollution, rather than material fatigue.INA Bearing Speed Vibration Solving Skills