German Emerson coupling Emerson model Emerson price

Emerson coupling connects two half-couplings with several sets of diaphragms (thin stainless steel plates) using bolts in an alternating pattern. Each set of diaphragms consists of multiple stacked layers. The diaphragms are available in link-type and various shapes of single-piece types. The diaphragm coupling compensates for the relative displacement of the two connected shafts through the elastic deformation of the diaphragms. It is a high-performance metallic flexible coupling that does not require lubrication, has a compact structure, high strength, long service life, no rotational backlash, and is unaffected by temperature or oil contamination. It features acid and alkali resistance and corrosion protection, making it suitable for shaft drive systems in high-temperature, high-speed, and corrosive media operating environments.

Emerson 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. Therefore, the price is much lower than that of 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) Fixing methods include set screw, clamping, and keyway fixation.

Emerson coupling features

Elastomers are generally composed 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, elastomers are widely used in applications with strong vibrations. The performance limit temperature of the elastomer determines the operating temperature of the coupling, typically ranging from -35 to +80 degrees. Jaw couplings feature a simple structure, require no lubrication, are easy to maintain and inspect, are maintenance-free, and allow for 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) Connected via an intermediate elastomer. 2) Absorbs vibration and compensates for radial, angular, and axial misalignment. 3) Oil-resistant and electrically insulating. 4) Identical rotational characteristics in both clockwise and counter-clockwise directions. 5) Set screw fixation.

Emerson coupling selection

Jaw couplings mainly come in two types: the traditional straight-jaw type and the curved (concave) jaw zero-backlash coupling. Traditional straight-jaw jaw couplings are not suitable for high-precision servo drive applications. Zero-backlash jaw couplings evolved from the straight-jaw type but are designed specifically for servo system applications, commonly used to connect servo motors, stepper motors, and ball screws. The curved design reduces the deformation of the elastic jaw spider and limits the impact 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 achieves fit between the elastomer and the hubs on both sides through compression, thereby ensuring its zero-backlash performance. Unlike slider couplings, which transmit torque via shear forces, jaw couplings transmit torque through compression. When using zero-backlash jaw couplings, users must ensure that the maximum load capacity of the elastomeric element specified by the manufacturer is not exceeded (while maintaining zero backlash). Otherwise, the jaw elastomer spider will be compressed, deformed, and lose its elasticity, causing the preload to disappear and resulting in the loss of zero-backlash performance. This may lead to serious issues that users might only discover after significant problems occur. Jaw couplings offer excellent balance performance 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 important consideration is the failure mode of jaw couplings. Once the jaw elastomer spider is damaged or fails, torque transmission is not interrupted; instead, the metal jaws of the two hubs engage directly to continue transmitting torque, which can potentially cause system problems. A major advantage of this coupling is the ability to select the appropriate jaw elastomer spider material based on actual application requirements. Some automation equipment companies offer jaw spiders made from various elastomeric materials with different hardness levels and temperature tolerances, allowing customers to choose the right material to meet the performance standards of their specific applications.

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