Common forms of non-contact sealed bearings, there are three: the gap seal, seal oil slingers and labyrinth seals. Because of the gap, in addition slinger seal, the non-contact seal used for grease lubrication occasions. To improve the reliability of sealing, various types of seals may be used in combination.

Non-contact bearing sealing device has several advantages as follows: In addition to the presence of the lubricant seal gap internal friction there will not be other external friction, therefore, no non-contact seal wear; a very long time and will not significant temperature rise; suitable for high speed areas. But the seal gap can not be too large, otherwise poor sealing effect.

Bearing support parts of non-contact seal comprising: a seal gap. Simple structure can meet the sealing requirements under normal conditions. E clearance selection d≤50mm, e = 0.25 ~ 0.40mm; d> 50mm, e = 0.25 ~ 0.6mm. Groove seal. After the trench filled with grease so that the dust is difficult to invade, there are two forms of a spiral groove and the ring groove. Ring groove generally have three. Width b = 3 ~ 5mm; groove depth t = 4 ~ 5mm.

Labyrinth seals. When the maze labyrinth seal filled with grease better than groove seal. Bearing labyrinth seal can be divided into radial and axial two forms. Radial and axial clearance selection: d≤50mm, a = 0.20 ~ 0.30mm, b = 1.0 ~ 1.5mm; d = 50 ~ 200mm, a = 0.30 ~ 0.50mm, b = 1.5 ~ 2.0mm.

Diagonal labyrinth seals. Large labyrinth for shaft deflection ramp it can swing with the center. Diagonal labyrinth seal labyrinth after filling the grease can achieve better sealing effect.

Slinger seal. Oil lubrication, shaft out of the trench or install a ring, you can drain the oil radially outwardly Desire thrown back into the oil sump through the bearing cover oil collecting chamber and the hole. You can also install the oil ring toss close to the bearing, this structure is often used in combination and seal the gap.

Stamping bearing steel labyrinth seal. Synthesis labyrinth seal consisting of stamped steel, which can rely on with stamping steel mounted on the shaft or housing, the axial fastening is not required, a simple structure. If stamping steel maze labyrinth filled with grease, with good sealing effect.