Solutions of Quality Problems in Bearing Seal Ring Assembly

Time：2020.10.29  Source：Roller Bearings Suppliers

The seal ring of the bearing is a common part in the bearing assembly structure. The assembly quality of the seal ring will directly affect the sealing performance of the bearing or the service life of the bearing.Bearing in the use of a lot of damage will be the bearing sealing ring assembly is related to the quality of our daily, common bearing sealing ring assembly quality problems what are the reasons?

Usually, there are several reasons for the quality problems in the assembly process of bearing seal ring: (1) The seal ring belt turns;(2)The sealing ring does not fit;(3)The sealing ring is easy to fall off;(4) The bearing outer ring initiation crack is too large;(5)Sealing ring lip mouth in the bearing rotation, roll back bite.

1. bearing seal ring with rotation

Bearing sealing ring with rotation is: refers to the bearing inner and outer ring in the process of rotation in the radial direction of the relative movement of the sealing ring, usually the sealing ring into the sealing groove is unable to turn.The main reason for its existence is that the size of the bearing seal ring retaining edge is small, and the interference between the inner lip of the seal ring and the outer sphere of the inner ring is greater than that between the seal ring retaining edge and the step of the outer ring sealing groove, that is, the friction between the seal ring and the step is less than that between the seal ring and the outer sphere.Need WSBC 22320 E,click here to learn more.

The solution is to appropriately increase the size of the bearing seal ring and increase the size of the inner lip of the seal ring on the premise of ensuring the assembly quality of the seal ring.

2. The bearing seal ring does not fit

Bearing seal ring is not fit: refers to the sealing ring assembly after the inner lip does not stick to the outer sphere of the inner ring, also known as the bell mouth.The seal ring does not fit will reduce the sealing performance of the bearing, thus affecting the product quality.The reasons for this phenomenon are as follows: (1) the lip interference in the sealing ring is too small;(2) The inner lip of the sealing ring is too thin and easily deformed;The sealing ring cannot be reset after installation.

According to the causes of different treatment:

(1) If the lip interference in the bearing seal ring is too small, the lip interference in the seal ring should be increased

(2) the bearing seal inner lip deformation caused by the bell mouth, mainly because the inner lip is too thin, the seal ring in the process of injection unloading caused the lip deformation of the seal ring, therefore, this situation must increase the thickness of the seal ring inner lip.

(3) The bell mouth caused by the bearing seal ring is no longer in position. During the bearing swing, the seal ring's head point A gets stuck in the sealing groove and cannot return to the original state. Therefore, the outer diameter size of the seal ring shall be reduced or the width size of the seal ring's head shall be reduced.

3. bearing seal ring easy to fall off

When the bearing seal ring falls off, it means that the seal ring falls out of the seal groove.The firmness of the sealing ring after assembly is verified by drop test. The reason for the seal ring falling off is that the interference between the sealing ring retaining edge and the step of sealing groove of the outer ring is small, and the length of the straight section near the sealing ring head is small.

Therefore by increasing sealing ring guard size and long seal head straight length close to guard a method to increase its strong degree of assembly, at the same time, the existing appropriate inside limited space, increase the sealing ring of seal groove guard width b, increase the contact area of sealing ring in the groove, the greater the contact area, the greater the friction force of seal ring and outer ring, swing bearing, seal ring is not easy to loose, rotation, sealing ring strong degree.Click here to learn more about WSBC 22224-E1.

4. bearing outer ring initiation crack is too large

Due to the need of assembly, there is an axial joint on the outer diameter of the bearing outer ring. After the sealing ring is installed, the axial joint of the bearing outer ring will increase due to interference. When the axial joint of the bearing outer ring increases to a certain degree, it will be difficult for the user to install the bearing.The interference between the sealing ring's edge and the step of the sealing groove of the outer ring should be reduced on the premise of not affecting the assembly quality of the bearings with the outer ring positioning, so as to reduce the gap of the outer ring's outer diameter.

5. The inner lip of the seal ring bites when the bearing rotates or turns over

Bearing in the process of rotation beyond its swing Angle, reset the sealing ring lip involved in the outer ring inner sphere, known as the sealing ring bite.

For this phenomenon, the main solution is to reduce the interference between the lip of the seal ring and the sphere of the inner ring.The second is to appropriately increase the rigidity and elasticity of the lips inside the seal ring, that is, to increase the thickness of the lips and reduce the waist size e of the seal ring.Only the lip of the sealing ring is rigid and elastic enough to avoid backbite when the bearing swings.