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Explanation of self-aligning ball bearings

Explanation of self-aligning ball bearings
Explanation of self-aligning ball bearings

What is a self-aligning ball bearing?
The bearing is equipped with spherical balls between the inner ring of the two raceways and the outer ring of the spherical surface of the raceway. The outer diameter of the self-aligning functional bearing and the inner diameter of the bearing seat are spherical cooperation, and there is an active self-aligning function between the two, which can compensate for the misalignment of the axes caused by the device error and the deformation of the bottom surface of the device. The material of the cage is steel plate, synthetic resin, etc.

Two structures of self-aligning ball bearings
1) Cylindrical hole
Self-aligning ball bearings are actively self-aligning due to their two rows of steel balls and cambered raceways in the outer ring
The viewpoint error between the shaft and the bearing housing can be accepted, and it is suitable for the working condition of the shaft misalignment caused by shaft deflection and misalignment.
Friction is the lowest of all rolling bearings
Even at high speeds; still only has a small temperature rise
2) Conical hole
The tapered hole self-aligning ball bearing has the characteristics of the cylindrical hole self-aligning ball bearing (but the inner hole is a tapered hole (conventional taper 1:12)
The device is installed on the tapered shaft to fine-tune the bearing clearance. This type of bearing is mostly used on double-support shafts that bend greatly under load
And in the parts where the two bearing seat holes cannot ensure strict concentricity. It is mainly used to accept radial loads, and can also accept a small amount of axial loads.
Usually cannot accept pure axial loads. The versatility of such bearings is second only to deep groove ball bearings
Its limit speed is lower than that of the same standard deep groove ball bearing, but its load capacity is higher than that of the deep groove ball bearing.

Features of self-aligning ball bearings
1) The outer ring raceway is spherical and has automatic centering
Even if the inner ring, steel ball and cage are slightly skewed relative to the outer ring (but the relative inclination of the inner and outer rings should not exceed 3 degrees), they can still rotate;
The bearing is thus self-aligning and unaffected by misalignment of the shaft relative to the bearing housing
2) It can withstand large radial loads and certain axial loads.
Large load capacity Because the internal structure of the outer spherical ball bearing is the same as that of the 6200 and 6300 series deep groove ball bearings, the IB seated outer spherical ball bearing can not only accept radial loads, but also large axial loads. The working noise of the same bearing is low.
3) Long service life
Long service life, spherical ball bearings with seats are generally used in harsh working environments such as soil, dust, humidity and high temperature, and the lubricating grease inside the bearing will deteriorate in a short period of time. Therefore, it is necessary to re-grease the outer spherical ball bearing with a seat at the right time and distance, and replace the degenerated grease with fresh grease.
IB cast iron insert ball bearings are equipped with grease nipples, which can be re-smoothed to ensure perfect function and long service life in any operating environment.
4) The sealing function is better
Excellent sealing function. Both sides of the outer spherical ball bearing are combined with heat-resistant, oil-proof rubber sealing ring and steel plate dust cover.
The dust cover is installed on the outer diameter of the inner ring of the bearing and rotates together with the inner ring, which can effectively prevent external foreign matter from entering the inside of the bearing, and can protect the bearing against external pressure. Soil, dust and moisture enter the inside of the bearing, which can prevent the grease inside the bearing from leaking out.
So that the bearing can maintain the perfect working function even in the harsh working environment

Application field
Usually cannot accept pure axial loads. Uniquely suitable for bearings that can experience considerable shaft deflection or misalignment, applications.
For example, fine appearance, low-noise motors, automobiles, motorcycles, woodworking machinery, transmission shafts of textile machinery, mining machinery, electromechanical equipment, plastic machinery, working equipment, medical equipment, fitness and sports equipment and general machinery, etc.;
It is the most widely used type of bearing in the machinery industry.

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Installation method of Deep Groove Ball Bearing

Installation method I of Deep Groove Ball Bearing: press fit: the inner ring of the bearing is tightly matched with the shaft. When the outer ring is loosely matched with the bearing seat hole, press the bearing onto the shaft with a press machine, and then install the shaft and the bearing into the bearing seat hole together. When pressing, pad an assembly sleeve made of soft metal material (copper or soft steel) on the end face of the bearing inner ring. The outer ring of the bearing is tightly matched with the bearing seat hole. When the inner ring is loosely matched with the shaft, The bearing can be pressed into the bearing seat hole first, and the outer diameter of the assembly sleeve should be slightly smaller than the diameter of the seat hole. If the bearing ring is tightly matched with the shaft and seat hole, the installation of the inner and outer rings should simultaneously press into the shaft and seat hole. The structure of the assembly sleeve should be able to simultaneously press the end faces of the bearing inner and outer rings.

How to choose the type of bearing

There are also relevant introductions on how to choose the brand and type of bearings, but some common sense about bearings that are more biased, or are often ignored or ignored, often play a very important role in the use of bearings. Learn about it.

Features of spherical plain bearings

The structure of the spherical plain bearing is simpler than that of the rolling bearing, which is mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. Joint bearings are generally used for low-speed swinging motion (ie angular motion). Since the sliding surface is spherical, it can also perform tilting motion (ie self-aligning motion) within a certain angle range. When the degree is large, it can still work normally.

Explanation of self-aligning ball bearings

The bearing is equipped with spherical balls between the inner ring of the two raceways and the outer ring of the spherical surface of the raceway. The outer diameter of the self-aligning functional bearing and the inner diameter of the bearing seat are spherical cooperation, and there is an active self-aligning function between the two, which can compensate for the misalignment of the axes caused by the device error and the deformation of the bottom surface of the device. The material of the cage is steel plate, synthetic resin, etc.

Precautions for the use of deep groove ball bearings

For deep groove ball bearings, the bearing load is too small during operation, which will cause sliding between the ball and the raceway, which will become the cause of scratches. This is especially true for large deep groove ball bearings with heavy ball and cage weights. In many cases, bearings will corrode. There are many reasons for bearing corrosion. The most common factors in our daily life are the following:

How deep groove ball bearings work

Deep groove ball bearings mainly bear radial load, and can also bear radial load and axial load at the same time. When it is only subjected to radial load, the contact angle is zero. When the deep groove ball bearing has a large radial clearance, it has the performance of an angular contact bearing and can bear a large axial load. The friction coefficient of the deep groove ball bearing is very small, and the limit speed is also high.