Bearing seal of single-sealing ring cone bit

Abstract

The invention discloses a bearing seal of a single-sealing ring cone bit, which comprises a cone (1), a jaw (2), an axial sealing ring (3) and a radial sealing ring (4), wherein the jaw (2) is provided with a jaw shaft (7), the cone is sleeved on the jaw shaft (7), an annular groove (8) is arranged at the root of the jaw shaft (7); an annular notch (9) is arranged at the bottom of a cone cavity (14), the sealing ring (5) is arranged in the annular notch (9), the axial sealing ring (3) and the radial sealing ring (4) are respectively arranged the upper end surface and the radial outer side of the sealing ring (5) and are in elastic contact with the annular notch (9), the sealing ring (5) rotates with the cone (1), and the lower end surface of the sealing ring (5) is in contact with and adaptive to the upper end surface of a static sealing body fixed on the annular groove. The bearing seal can improve the effective contact height and area between the cone cavity and the jaw shaft and has the advantages of little cone strength damage, low cone inner hole precision requirement, good sealing effect and simple structure.

Description

technical field [0001] The invention relates to a bearing sealing device, in particular to a roller cone bit bearing sealing device used in deep well operations. Background technique [0002] At present, most of the sealing structures of roller cone bits used in deep well operations are bimetallic sealing ring structures, but the structure of bimetallic sealing rings is relatively complicated and requires high processing conditions. U.S. Patent SU4,753,304 and Chinese Utility Model Patent CN2497035Y (Patent No. ZL 01247040.6) titled "Roller Bit Bearing with Comprehensive Sealing Capabilities" disclose a single metal seal structure, which is characterized in that a metal seal ring is removed to reduce the sealing capacity. The axial space occupied by the structure increases the effective contact area of ​​the bearing and improves the reliability. However, this type of structure cannot get rid of the defects that the inner hole of the cone that directly fits the sealing ring r...

AI Technical Summary

Problems solved by technology

Factors such as the structure of the cone itself determine that it does not have the conditions for surfacing welding. The method of assembling a metal inlaid ring in the annular gap can only improve the strength of the contact surface with the metal sealing ring, and the height of the metal inlaid ring should not be too small, otherwise it will affect The fixing stability and use effect of the metal inlaid ring in the annular gap, therefore, the use of the metal inlaid ring will inevitably occupy the height space, resulting in the reduction of the effective contact height h1 between the inner cavity of the gear wheel and the claw shaft, resulting in the effective contact of the claw bearing The area is reduced, causing damage to the strength of the cone, and the structure of the above-mentioned single metal sealing ring is relatively complicated, and the inner hole of the cone that fits the metal inlaid ring requires too high precision and is difficult to process

In addition, the above-mentioned structure has only one level of sealing of the axial sealing ring, and the sealing effect is poor.

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