Passive follow-up hydraulic rotary joint

A rotary joint, comprising:

• 1) a hydraulic follow-up mechanism, the hydraulic follow-up mechanism comprising a cylinder body, a valve sleeve, a valve core, a valve body, a left end cover, and a right end cover;
• and
• 2) a rotary transmission mechanism, the rotary transmission mechanism comprising a tray, a stabilizing ring, a follow-up disk, a torque transfer disk, and a stable supporting wheel mechanism;
• wherein:
• the left end cover and the right end cover are arranged at left and right ends of the cylinder body, respectively;
• the valve body is concentrically mounted in a cylindrical hollow chamber of the cylinder body;
• an output shaft at a right end of the valve body projects out of the right end cover;
• a right end of the valve core is provided with a valve core torque transfer shaft extending rightwards through the right end of the valve body;
• the tray and the stabilizing ring constitute a tray mechanism;
• the tray mechanism is concentrically mounted on a spigot on an outer side of the output shaft at the right end of the valve body;
• the follow-up disk is concentrically mounted on the output shaft at the right end of the valve body;
• a thrust ball bearing is concentrically mounted between the follow-up disk and the tray mechanism;
• two deep groove ball bearings are concentrically mounted at a right end of the follow-up disk;
• a fixing nut is mounted at the right end of the valve body;
• the torque transfer disk is concentrically mounted at the right end of the valve core;
• four stable supporting wheel mechanisms are mounted centrally symmetrically on the torque transfer disk;
• and
• stabilizing wheels of the four stabile supporting wheel mechanisms are respectively mounted in four stabilizing grooves opened on the stabilizing ring.