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AssigneeDanfoss A/S
InventorsBirthe Nissen Reese, Sigurd Larsen, Nicolai Risom Windelborg
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A rotor tube assembly for a fluid valve actuator including a bearing housing assembly, a lead screw with a bottom shoulder, a rotor sleeve assembly with a non-block assembly, a bushing and a rotor tube. The lead screw is provided at least partially inside the bearing housing assembly, the rotor sleeve assembly, the bushing and the rotor tube. The bottom shoulder abuts the bearing housing assembly and the lead screw includes a bottom threaded portion on one side of the bottom shoulder and on the other side of the bottom shoulder and in this given order a bottom coupling portion for coupling the bearing housing assembly to the lead screw, a central coupling portion for coupling the rotor sleeve assembly to the lead screw, and an upper coupling portion for coupling the bushing to the lead screw. The bottom shoulder has a larger outer diameter than the coupling portions, the bottom coupling portion has a larger outer diameter than or the same diameter as the central coupling portion and the upper coupling portion has a smaller diameter than or the same diameter as the bottom coupling portion and the central coupling portion. The disclosure is also directed at a method for assembling a rotor tube assembly.
A rotor tube assembly for a fluid valve actuator, comprising a bearing housing assembly, a lead screw with a bottom shoulder, a rotor sleeve assembly with a non-block assembly, a bushing and a rotor tube, wherein the lead screw is provided at least partially inside the bearing housing assembly, the rotor sleeve assembly, the bushing and the rotor tube, wherein the bottom shoulder abuts the bearing housing assembly, wherein the lead screw comprises a bottom threaded portion on one side of the bottom shoulder and on the other side of the bottom shoulder and in this given order a bottom coupling portion for coupling the bearing housing assembly to the lead screw, a central coupling portion for coupling the rotor sleeve assembly to the lead screw, and an upper coupling portion for coupling the bushing to the lead screw, wherein the bottom shoulder has a larger outer diameter than the coupling portions, the bottom coupling portion has a larger outer diameter than or the same diameter as the central coupling portion and the upper coupling portion has a smaller diameter than or the same diameter as the bottom coupling portion and the central coupling portion.
Dependencies are inferred from the claim text.