Sealing device for large bearing

Abstract

The invention discloses a sealing device for a large bearing. The sealing device comprises an outer skeleton, an inner skeleton and a labyrinth rubber sealing piece, wherein the outer skeleton is fixed to a bearing outer ring, the inner skeleton is fixed to a bearing inner ring, and the labyrinth rubber sealing piece is arranged between the inner skeleton and the outer skeleton; the inner skeletoncomprises an inner skeleton inner ring and an inner skeleton outer ring, and the width of the inner skeleton outer ring is less than that of the inner skeleton inner ring; and one end of the outer skeleton is fixedly connected with the inner circumferential surface of the bearing outer ring, the other end of the outer skeleton extends into a cavity formed by the inner skeleton inner ring, a support ring and the inner skeleton outer ring, the labyrinth rubber sealing piece comprises a water retaining cover, an upper sealing lip and a lower sealing lip, a first labyrinth cavity is enclosed by the water retaining cover, the inner skeleton outer ring and the upper sealing lip, and a second labyrinth cavity is enclosed by the lower sealing lip, a sealing toothed groove and the inner skeleton inner ring. According to the sealing device, the purposes of internal oil seal and external dust prevention can be realized, the sealing dust prevention effect is good, tests show that the linear speedof the sealing device can reach at least 12 m / s, and the physical life can at least reach 5000 h.

Description

technical field [0001] The invention relates to the technical field of sealing of bearings, in particular to a sealing device for large bearings. Background technique [0002] During the movement of the bearing, there must be relative motion between the inner and outer rings of the bearing and the rolling elements. In this way, friction will be generated between the moving bodies, which will consume part of the mechanical energy and cause heat and wear between the inner and outer rings and the rolling elements. In order to reduce friction resistance, slow down the wear speed of bearings and control the temperature rise of bearings, and improve the service life of bearings, the lubrication of bearings must be considered in the design of the mechanism using bearings, and the sealing of bearings must also be considered in order to keep the bearings lubricated. , A good seal of the bearing seat can prevent the bearing lubricating medium from leaking, and impurities will not inva...

AI Technical Summary

Problems solved by technology

For large bearings (200mm≤D≤430mm) using oil seals or sealing devices, the linear speed and speed generally do not exceed 8m / s. If it exceeds 8m / s, the friction torque at the contact part between the oil seal and the rotating shaft will increase, which will aggravate the wear of the oil seal and the temperature of the system. Increase, reduce the service life of oil seals and mechanical devices

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