A segmented shaft central swivel joint

By using an annular cylinder and a limiting device in the hydraulic rotary joint, the problems of sealing surface wear and complex processing in the prior art are solved, achieving the effects of cost reduction and simplified maintenance.

CN224364538UActive Publication Date: 2026-06-16JIANGSU CHANGLING HYDRAULIC CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JIANGSU CHANGLING HYDRAULIC CO LTD
Filing Date
2025-07-09
Publication Date
2026-06-16

AI Technical Summary

⚠Technical Problem

Existing hydraulic rotary joints suffer from uneven wear of the sealing surface due to structural deformation or assembly errors during long-term operation, requiring the simultaneous replacement of the rotary body or rotary shaft, which is costly and complex to manufacture.

⚗Method used

A segmented shaft-type central rotary joint is designed. By mounting an annular cylinder, an O-ring seal, and a limiting device on the rotary shaft, a ring-shaped oil passage similar to a traditional annular oil passage is formed, reducing the machining requirements of the rotating body or rotary shaft. The limiting device and the sealing ring prevent wear and leakage.

🎯Benefits of technology

It reduces processing and maintenance costs, simplifies production processes, reduces the frequency of replacements due to wear and tear, and improves the ease of equipment maintenance.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model discloses a segmented shaft type central rotary joint, through a plurality of annular barrels are sleeved in the rotary shaft, and the limiting device and O type sealing ring are arranged between the adjacent barrels, and the rotary body is sleeved in the periphery of the annular barrel. The limiting device forms a communicating cavity, so that the L type oil inlet of the rotary shaft is communicated with the oil outlet of the rotary body, and segmented axial positioning is realized at the same time. The first sealing ring is arranged on the both sides of the annular barrel, and the second sealing ring is arranged on the end face of the rotary shaft. The advantage lies in that the segmented structure solves the problem of long shaft sealing, the modular design reduces the maintenance cost, and the multiple sealing guarantees the reliability of the high pressure environment.
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