Considering the gap of high-speed imported bearings, not only the above factors are considered, but also the influence of the heat-extended shaft clearance is required. It is required that the imported bearings are in the working state and the optimal working temperature gap. Which kind of customs clearance includes the center of the outer ring ball groove The formation of quasi-states. Due to the low internal friction and the relatively sliding high-speed inlet bearing, it is best not to use the inner ring and the outer ring to adjust the clearance of the bearing displacement of the pivotal ball. In consideration of the interference with the amount of clearance of the imported bearings, attention should be paid to the high temperature of the material, the tendency to be deformed, and the possibility that many permanent deformations due to temperature changes at high temperatures become soft.
1. High-speed imported bearings with high-speed imported bearings and clearance, according to requirements, because high-precision imported bearings are also subject to high-temperature imported bearings, so you can consider coordination and cleaning, consider the following points:
(1) The change in the magnitude and hardness of the temperature change as the temperature rises to a high temperature;
(2) High-speed, centrifugal force caused by changes in the force system and shape changes.
In short, high speed, high temperature conditions, from the choice of coordination and clearance, efforts to maintain the accuracy and performance of imported bearings, it is difficult. In order to ensure the installation of the roller inlet bearing, the deformation is small, the interference and interference amount can not be too large, high-speed centrifugal force and high-temperature thermal expansion, or offset with the surface of normal pressure. Or the surface is slack, the amount of interference must be taken into consideration, the two factors of constant speed and the effective amount of high-speed imported bearings under the interference calculation, may be invalid at room temperature.
2. The requirements of the main parts of the main engine require high-speed imported bearings. The bearing rotation system has been precisely balanced. The shaft and the imported bearing parts should be larger than the general requirements for dimensional accuracy and geometric accuracy. The coaxiality is higher. Vertical holes or magazines, seats. On, and in considering these issues, especially in the shoulders of the block, it must also be noted that these factors are factors when high-speed imported bearings operate and high temperature factors. The shaft support system not only needs high rigidity, but also requires as light a mass as possible. In order to overcome this contradiction, measures such as reducing surface roughness and improving surface hardening can be adopted to improve the rigidity of the imported bearings and the hollow shaft to reduce the use. Quality system.
3. HA type tapered roller imported bearings developed by Japan and other countries, imported bearing outer wall, so that the oil flow lubrication of the outer wall and the roller contact area is large, and here even at rest can be combined with oil to avoid thinning Burning accidents, but the holes in the outer wall began to create several rows to avoid oil-free discharge channels, some of the power and temperature caused by the retention of oil agitation losses. Due to the inner wall, the temperature is lowered, thereby reducing the possibility of creep occurring between the inner ring and the shaft between the mating surfaces. This more stable guide roller allows the cage to be used to guide the pattern of the outer ring of the bearing without the skewed normal operation to avoid excessive vibration and wear, which is also beneficial for high speed.