German Fibro coupling, Fibro model, Fibro price

Fibro 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-style and various shapes of single-piece designs. Diaphragm couplings compensate for the relative displacement of the connected shafts through the elastic deformation of the diaphragms. They are high-performance, metallic, flexible couplings that require no lubrication, 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 system drives operating in high-temperature, high-speed, and corrosive environments.

Fibro coupling manufacturing process

Jaw couplings are machined using turning, milling, and broaching, followed by overall heat treatment to ensure sufficient mechanical strength. Another type of jaw hub available on the market is cast, allowing for mass production and eliminating machining losses, resulting in a much lower price compared to machined versions. However, cast components do not perform as well and are best avoided in critical applications. Cast jaws are prone to tooth breakage (jaw tooth detachment) under high speed or high load conditions. 1) Compact, zero-backlash, available with three different hardness elastomers; 2) Absorbs vibration and compensates for radial and angular misalignment; 3) Simple structure, easy maintenance and inspection; 4) Maintenance-free, oil-resistant, electrically insulating, operating temperature 20℃ to 60℃; 5) Jaw elastomers are available in four, six, eight, and ten-lobe configurations; 6) Mounting options include set screw, clamping, and keyway fixation.

Fibro coupling features

Elastomers are typically made of engineering plastics or rubber. The service life of the coupling is determined by the service life of the elastomer. Since elastomers are subjected to compression rather than tension, their typical service life is 10 years. Due to their cushioning and vibration-damping properties, they are widely used in applications with strong vibrations. The performance limit temperature of the elastomer determines the operating temperature of the coupling, generally ranging from -35 to +80 degrees. Jaw couplings feature a simple structure, require no lubrication, allow for easy maintenance and inspection, are maintenance-free, and support continuous long-term operation. High-strength polyurethane elastomeric elements are wear-resistant and oil-resistant, offering high load capacity, long service life, and safe, reliable operation. They provide stable and reliable performance with good vibration damping, cushioning, and electrical insulation properties. They offer significant axial, radial, and angular compensation capabilities. Their simple structure, small radial dimensions, light weight, and low moment of inertia make them suitable for medium to high-speed applications. Structural features: 1) Central elastomer connection. 2) Absorbs vibration and compensates for radial, angular, and axial misalignment. 3) Oil-resistant and electrically insulating. 4) Identical rotational characteristics in clockwise and counter-clockwise directions. 5) Set screw fixation.

Fibro coupling selection

Jaw couplings mainly come in two types: the traditional straight-jaw type and the curved (concave) jaw zero-backlash type. Traditional straight-jaw jaw couplings are not suitable for high-precision servo drive applications. Zero-backlash jaw couplings evolved from the straight-jaw design but are engineered to suit servo system applications, commonly connecting servo motors, stepper motors, and ball screws. The curved shape reduces deformation of the elastic jaw spider and limits the effect of centrifugal force during high-speed operation. A zero-backlash jaw coupling consists of two metal hubs (typically aluminum alloy, with stainless steel also available) and a jaw elastomer spider. The jaw elastomer spider has multiple lobes. Like a slider coupling, it is assembled by compressing the elastomer spider between the two hubs, ensuring zero-backlash performance. Unlike slider couplings, which transmit torque via shear forces, jaw couplings transmit torque via compression. When using zero-backlash jaw couplings, users must ensure they do not exceed the manufacturer's specified maximum load capacity for the elastomeric element (while maintaining zero backlash). Otherwise, the jaw elastomer spider will be compressed and deformed, losing its elasticity and preload, resulting in loss of zero-backlash performance, which may lead to serious issues that only become apparent later. Jaw couplings offer excellent balance and are suitable for high-speed applications (maximum speed up to 30000 rpm), but they cannot handle large misalignments, especially axial misalignment. Larger eccentricity and angular misalignment generate higher bearing loads compared to other servo couplings. Another concern is failure mode. If the jaw elastomer spider is damaged or fails, torque transmission is not interrupted; the metal jaws of the two hubs engage and continue to transmit torque, which may cause system problems. Selecting the appropriate jaw elastomer spider material for the specific application is a major advantage of this coupling. Some automation equipment companies offer jaw spiders in various elastomeric materials with different hardness and temperature ratings, allowing customers to choose the right material to meet actual application performance standards.

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