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Installation with high-speed bearings and adjustment:
A high-speed bearings with clearance and according to both the high-speed precision bearings bearing requirements, but also according to temperature bearing requirements, so consider the coordination and clearance to take account of the following points:
(1) when the temperature rose to high temperature dimensional change and hardness;
(2) high speed, the centrifugal force caused by the force system change and shape change.
In short, high-speed, high-temperature conditions, coordination and clearance from the choice of the bearing should strive to maintain the accuracy and performance, it is difficult.
In order to ensure the bearing raceway after installation of small deformation, interference fit amount of interference can not get too big, and high speed centrifugal force and high temperature thermal expansion, or offset with the surface normal pressure. Or so with the surface relaxation, so the amount of interference must be considered under the premise of these two factors be carefully calculated, at room temperature constant speed and effective amount of interference for high-speed bearings may be invalid.
If the calculation results of this contradiction is too large (usually only in the ultra high speed only in this case), only by taking the lubrication ring lubrication and hydrostatic lubrication with a double measure, and this solution has the potential to break the bearing dmn value 3 million mark.
High temperature thermal expansion, or offset with pressure normal to the surface. Or so with the surface relaxation, so the amount of interference must be considered under the premise of these two factors be carefully calculated, at room temperature constant speed and effective amount of interference for high-speed bearings may be invalid.
If the calculation results of this contradiction is too large (usually only in the ultra high speed only in this case), only by taking the lubrication ring lubrication and hydrostatic lubrication with a double measure, and this solution has the potential to break the bearing dmn value 3 million mark.
In considering the high speed bearing clearance is not only to consider the above factors, but also to consider the thermal elongation axis of the impact on the clearance required bearing in working condition, that there is at operating temperature optimum clearance, which kind of clearance is taken into account, the outer ring ball groove center precise alignment of state formation. As high-speed bearings for lower relative sliding and internal friction, it is best not to use the inner and outer rings relative axial displacement method to adjust the ball bearing clearance.
In considering the amount of interference with the bearing and clearance, to note that materials at high temperatures becomes soft and easily deformed features, as well as many from the room temperature to high temperature changes cause some permanent deformation possibilities.
(2) the requirement for host-related parts
Where the rotational speed bearing system requires precision bearing dynamic balancing shaft and the bearing seat hole installation site should have higher than normal required size and shape precision accuracy, especially for concentricity and retaining shoulder seat hole or journal vertical, and in consideration of these issues, it must also be noted that the high-speed operation of the bearing element and the temperature factor.
Shaft support systems require both high rigidity, and quality requirements as light as possible, in order to overcome this contradiction can be taken, such as reducing the surface roughness and improve surface hardening measures to improve the supporting stiffness, the use of hollow shaft to reduce system quality.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| R22ZZ NSK | 34.925 | 63.5 | 14.288 |
| R22 NSK | 34.925 | 63.5 | 11.113 |