In general, when the rolling element (ball or roller) is allowed between the inner and outer rings of the rolling bearing, a certain space must be reserved between the rolling element and the inner and outer rings. This is because:Industrial Grain –Bearing
When installing the bearing, if the inner ring and the shaft adopt interference fit, the inner ring will expand and the inner ring raceway will expand at the same time;Industrial Grain -Bearing
If the outer ring and bearing seat also adopt interference fit, the outer ring raceway will shrink.Industrial Grain -Bearing
In either case, the game will be reduced. Therefore, if the bearing before installation does not have a certain clearance, negative clearance will be generated after installation. The rolling body (ball or roller) inside the bearing will bear additional load, increase friction torque and temperature rise, and make the bearing bite or damage prematurely.
Moreover, when the bearing rotates, the rolling temperature is higher than that of other parts, and its thermal expansion will also reduce the clearance. Therefore, the bearing is also required to have a certain clearance.Industrial Grain -Bearing
But it doesn’t mean that the larger the clearance, the better. If the clearance is too large, vibration and noise will be generated when the bearing rotates, and the load distribution inside the bearing will deteriorate, resulting in early damage. Therefore, the clearance must be appropriate and appropriate.Industrial Grain -Bearing
When the bearing has internal clearance, if the inner ring is fixed, the outer ring will be in a multi degree of freedom movable state. According to its movement direction, the clearance can be mainly divided into radial clearance, axial clearance and angular clearance.
The geometric relationship of these three clearances is determined by the internal size of the bearing. In addition, the clearance also determines the contact angle of the steel ball in the bearing.Industrial Grain -Bearing
Mechanical knowledge is complex and diverse. A small part will have great functions and many classifications. Such as bearings. As long as the rotating equipment is inseparable from the bearing, it is known as “industrial grain”.Industrial Grain -Bearing
For people who are often in contact with machinery, we all know that the role of bearings can not be underestimated. The relevant knowledge and functions of bearings are inevitable in our work and life. Here is a brief introduction to the basic knowledge of bearings.Industrial Grain -Bearing
What is a bearing?Industrial Grain -Bearing
Compared with large machinery, bearing is a small part, but it plays an important role.
It is mainly used to fix and reduce the load friction coefficient in the process of mechanical transmission. When other parts move relative to each other on the shaft, the bearing can be used to reduce the friction coefficient in the process of power transmission and keep the central position of the shaft fixed. According to the different friction properties of moving elements, bearings can be divided into rolling bearings and sliding bearings.
According to the different functions, designs and functions of bearings, there are many types of bearings, including needle roller bearings, self-aligning ball bearings, deep groove ball bearings, self-aligning roller bearings, thrust bearings, pedestal bearings, joint bearings, combined bearings, rolling mill bearings, etc. Different bearings have different functions and play an important role in different mechanical equipment.
Code of bearing
A complete bearing code is composed of basic code and one or more supplementary codes. The basic code is used to indicate the type of bearing, the basic design of bearing and the overall dimension of bearing. The supplementary code refers to the components of the bearing and the variants with different structures or other characteristics from the basic design.