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Staubli couplings connect two half-couplings with several sets of diaphragms (thin stainless steel plates) bolted in an alternating pattern. Each diaphragm set consists of multiple stacked layers. Diaphragms are available in link-type and various shapes of single-piece types. Diaphragm couplings compensate for the relative displacement between the two connected shafts through the elastic deformation of the diaphragms. They are high-performance, metal-element flexible couplings that require no lubrication. They feature a compact structure, high strength, long service life, zero rotational backlash, and are unaffected by temperature or oil contamination. They offer acid, alkali, and corrosion resistance, making them suitable for shaft drive systems operating under high temperatures, high speeds, and in corrosive media.

Staubli Coupling Features and Applications

1) Cross universal couplings enable two shafts that are not on the same axis, with large angular misalignment and significant axial movement, to rotate continuously at equal angular velocities. 2) Cross universal couplings reliably transmit torque and motion. Their most notable feature is their large angular compensation capability. 3) Cross universal couplings use integrated yokes, enhancing operational reliability. 4) Cross universal couplings have a compact structure, high transmission efficiency, low noise, long service life, and are easy to maintain and repair. Cross universal couplings are suitable for transmitting torque in the mechanical shaft systems of metallurgical machinery, heavy machinery, petroleum machinery, engineering machinery, lifting and transport machinery, locomotives and rolling stock, light industrial machinery, precision machinery, control machinery, and other heavy machinery industries.

Staubli Coupling Installation

Assembly technique for cross universal couplings: During assembly, remove burrs and clean all parts. Ensure that the centerlines of the bearing holes in the two intermediate welded yokes lie in the same plane; the permissible deviation must not exceed 1°. The spline section should slide freely, and the joints should rotate flexibly. Clean the surfaces. Except for the flange end faces and end-face keys, which should be coated with anti-rust grease, apply one coat of anti-rust primer to the remaining surfaces, followed by paint (do not apply paint to the excluded areas).

Staubli Coupling Structure and Maintenance

Cross universal couplings are available in various structural types. Their most notable feature is their large angular compensation capability, compact structure, and high transmission efficiency. In practical applications, they are classified into heavy-duty, medium-duty, light-duty, and small types based on the torque transmitted by the universal shaft. Types include cross-axis cross universal couplings, ball-cage cross universal couplings, ball-fork cross universal couplings, block-type cross universal couplings, ball-pin cross universal couplings, ball-joint cross universal couplings, ball-joint plunger cross universal couplings, three-pin cross universal couplings, triple-yoke cross universal couplings, three-ball-pin cross universal couplings, and hinge-rod cross universal couplings. The most commonly used type is the cross-axis cross universal coupling, followed by the ball-cage cross universal coupling. Maintenance method for cross universal couplings: Lubricate regularly; it is recommended to inject oil once a week, or daily under high-temperature conditions. To extend the service life of the universal coupling, adjust the cross shaft by 180 degrees during each disassembly to alternate the usage of the cross shaft journals.

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