How to install high-speed bearings
2014-12-01 by lyhybearings
1. Install and adjust speed with bearing
When the co-ordination and speed of the bearing clearance due to the high-speed precision bearings bearing both according to requirements, but also according to the requirements of high temperature bearings, so consider the fit and clearance, to take into account the following points:
(1) The dimensional change and hardness change temperature rose at a high temperature;
Changes force system (2) under centrifugal force caused by high-speed and change in shape.
In short, at high speed, high temperature conditions, and with clearance from the choice should strive to maintain the accuracy and performance of the double direction thrust ball bearing, which is difficult.
In order to ensure the bearing raceway deformation after installation, interference interference fit can not get too big and hot and high-speed centrifugal force under the next expansion, or offset with the surface normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully considering the above two factors under the premise, at room temperature under normal speed and effective interference for high-speed bearings may be invalid.
If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark.
Thermal expansion at high temperatures, or offset mating surface normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully considering the above two factors under the premise, at room temperature under normal speed and effective interference for high-speed bearings may be invalid.
If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark.
When considering the high speed bearing clearance only to consider the above factors, but also to consider the impact of thermal elongation axis clearance required bearing in working condition, that has the best clearance at operating temperature, which kinds of clearance is included, the precise center of the outer ball groove to the next state formation. Because of the relative sliding speed bearings and strive to reduce internal friction, it is best not to use the inner and outer rings relative axial displacement method to adjust ball bearing clearance.
In considering the amount of interference with the bearing and the clearance, to note that the material becomes soft and easily deformable characteristics, and many times from room temperature to high temperature changes caused by the possibility of a certain permanent deformation at high temperatures.
2. The requirement for host-related parts
Where the rotation speed bearings require Full complement cylindrical roller bearing system has been precision balancing, shaft and bearing housing bore installation site should have a higher than normal requirements for dimensional accuracy and geometric precision, particularly for concentricity and retaining shoulder seat hole or journal vertical, and in considering these questions, the same factors must be noted that the high-speed and high-temperature operation of the bearing factor.
Shaft support systems require both high rigidity and light weight as possible also requested, in order to overcome this contradiction can be taken, such as reducing the surface roughness and improve surface hardening measures to improve the bearing stiffness, the use of hollow shaft to reduce system quality.
When the co-ordination and speed of the bearing clearance due to the high-speed precision bearings bearing both according to requirements, but also according to the requirements of high temperature bearings, so consider the fit and clearance, to take into account the following points:
(1) The dimensional change and hardness change temperature rose at a high temperature;
Changes force system (2) under centrifugal force caused by high-speed and change in shape.
In short, at high speed, high temperature conditions, and with clearance from the choice should strive to maintain the accuracy and performance of the double direction thrust ball bearing, which is difficult.
In order to ensure the bearing raceway deformation after installation, interference interference fit can not get too big and hot and high-speed centrifugal force under the next expansion, or offset with the surface normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully considering the above two factors under the premise, at room temperature under normal speed and effective interference for high-speed bearings may be invalid.
If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark.
Thermal expansion at high temperatures, or offset mating surface normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully considering the above two factors under the premise, at room temperature under normal speed and effective interference for high-speed bearings may be invalid.
If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark.
When considering the high speed bearing clearance only to consider the above factors, but also to consider the impact of thermal elongation axis clearance required bearing in working condition, that has the best clearance at operating temperature, which kinds of clearance is included, the precise center of the outer ball groove to the next state formation. Because of the relative sliding speed bearings and strive to reduce internal friction, it is best not to use the inner and outer rings relative axial displacement method to adjust ball bearing clearance.
In considering the amount of interference with the bearing and the clearance, to note that the material becomes soft and easily deformable characteristics, and many times from room temperature to high temperature changes caused by the possibility of a certain permanent deformation at high temperatures.
2. The requirement for host-related parts
Where the rotation speed bearings require Full complement cylindrical roller bearing system has been precision balancing, shaft and bearing housing bore installation site should have a higher than normal requirements for dimensional accuracy and geometric precision, particularly for concentricity and retaining shoulder seat hole or journal vertical, and in considering these questions, the same factors must be noted that the high-speed and high-temperature operation of the bearing factor.
Shaft support systems require both high rigidity and light weight as possible also requested, in order to overcome this contradiction can be taken, such as reducing the surface roughness and improve surface hardening measures to improve the bearing stiffness, the use of hollow shaft to reduce system quality.
keywords: agricultural bearings