Commonly used non-contact seal a gap seals, labyrinth seal and slinger seals and other forms. Because there is a gap, in addition slinger seals, non-contact seals are used for grease lubrication occasions. In order to improve the reliability of sealing can be combined with various types of sealing.
Since the non-contact seal gap at the sealing means, there is a lubricant in addition to internal friction, will not be any other friction, therefore, does not produce non-contact seals wear, used for a long time does not produce significant temperature rise, suitable for high speed local. However, sealing the gap can not be too large, otherwise the sealing effect poor.
Bearing supported by parts of the non-contact seals:
1 gap seals: simple structure, to meet the general requirements under seal. E selection of the gap d ≤ 50mm, e = 0.25 ~ 0.40mm; d> 50mm, e = 0.25 ~ 0.6mm.
2 Groove Seal: After the trench is filled with grease so that the dust is difficult to invade, there are ring groove and spiral grooves in two forms. Ring groove generally have three. Width b = 3 ~ 5mm; groove depth t = 4 ~ 5mm.
3 labyrinth seal: When Maze labyrinth filled with grease, its sealing effect than the trench sealed. Labyrinth seal can be divided into two types of radial and axial. 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.
4 oblique labyrinth seals: for shaft deflection is large, curved road slope can swing with the center. Oblique curved road labyrinth seal can be achieved after the grease filled in a better sealing effect.
5. Stamping steel labyrinth: the composition of the synthetic stamping steel labyrinth seals, which can rely on with stamping steel mounted on the shaft or housing, without axial fastening, simple structure. If the stamping steel labyrinth maze filled with grease, with good sealing effect.
6 slinger seal: oil lubrication, the shaft out of the grooves, or the installation of a ring, you can drain the oil out of the desire thrown radially through the bearing cap oil collection chamber with hole flow back into the oil sump. You can also close the bearings mounted oil ring toss, this structure is often used in combination and crevice seal.


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