German SGF coupling SGF model SGF price

SGF couplings transmit motion by welding or bonding a thin-walled corrugated tube (bellows) directly to the two coupling halves. This coupling features a simple structure, compact dimensions, easy machining and installation, and high transmission accuracy. It is mainly used in low-power precision machinery and control mechanisms that require compact structures and high transmission accuracy. The coupling consists of two hubs and a thin-walled metal tube, connected by welding or bonding. Although many other materials are available, stainless steel and nickel are the most common materials for the metal tube. Nickel tubes are completed using electrodeposition. This method first involves machining a solid mandrel into a corrugated shape, electroplating nickel onto the mandrel, and then chemically dissolving the mandrel to obtain the nickel bellows. This method controls the precision of the bellows wall thickness and achieves thinner walls than other manufacturing methods. These thin-walled bellows give the coupling high sensitivity and rapid response, making it ideal for applications in extremely small and precise instruments.

SGF coupling drive system

Diaphragm coupling shaft drive system: Shaft drives typically connect the driving and driven shafts using one or several diaphragm couplings to form a shaft drive system for transmitting rotation or motion. Diaphragm couplings are primarily used to connect the shafts of motors, gearboxes, and working machines. The bore shape, connection type, and dimensions depend mainly on the type and size of the connected shafts. During product design, shafts are generally designed according to international standards for cylindrical and conical shaft depths; shaft depth standards target shaft design. In the structural and series design of various metal diaphragm couplings, the bore range (maximum and minimum bores) and bore length for each specification are determined based on the transmitted torque, diaphragm coupling structure, and hub strength. Each specification has only one bore length. Internationally, diaphragm coupling manufacturers specify only one bore length per specification in their standards. Due to the misleading influence of GB/T3852, Chinese diaphragm coupling product standards correspond multiple bore lengths to each specification as the bore changes. When converting foreign diaphragm coupling standards to Chinese standards, multiple bore lengths were also added, seemingly to achieve complete conversion.

SGF coupling application range

Widely used in shaft drives of various mechanical devices, such as water pumps (especially high-power and chemical pumps), fans, compressors, hydraulic machinery, petroleum machinery, printing machinery, textile machinery, chemical machinery, mining machinery, metallurgical machinery, aviation (helicopters), high-speed power transmission systems of ships, steam turbines, piston-type power machinery transmission systems, tracked vehicles, and high-speed, high-power mechanical transmission systems of generator sets. After dynamic balancing, application in high-speed shaft drives has become relatively common.

SGF coupling usage precautions

1) Products with diaphragms have sharp edges and may cause injury; it is recommended to wear thick gloves during installation. 2) Please install protective covers or similar devices around the coupling to ensure safety. 3) If shaft misalignment exceeds the allowable value during installation, the coupling may deform, leading to damage or reduced service life. 4) Allowable shaft misalignment for the coupling includes radial, angular, and axial deviations. During installation, please adjust to ensure shaft misalignment remains within the allowable values specified in the corresponding product catalog. 5) When multiple types of misalignment occur simultaneously, the corresponding allowable values must be halved. 6) To extend the service life of the coupling, it is recommended to keep shaft misalignment within 1/3 of the allowable value. 7) Insert the mounting shafts before tightening the screws; otherwise, the coupling may deform. When tightening screws, use a torque wrench and do not use screws other than those provided as accessories. 8) If abnormal noises occur during operation, stop immediately and check installation accuracy, loose screws, etc. It is recommended to apply adhesive to the outer surface of the screws after installation and debugging to enhance protection.

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