German R+W coupling R+W model R+W price

R+W coupling connects several sets of diaphragms (thin stainless steel plates) to the two coupling halves with bolts in an alternating arrangement. Each set of diaphragms consists of multiple stacked layers. The diaphragms are available in link-type and one-piece designs of various shapes. Diaphragm couplings compensate for the relative displacement between the two 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, and zero rotational backlash. They are unaffected by temperature or oil contamination, offer acid, alkali, and corrosion resistance, and are suitable for shaft transmission in high-temperature, high-speed, and corrosive environments.

R+W 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, backlash-free, available with three different hardness elastomers; 2) Absorbs vibration, 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 lobes; 6) Fixing methods include set screw, clamping, and keyway fixation.

R+W 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, they 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 excellent 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 both clockwise and counter-clockwise directions. 5) Set screw fixation.

R+W coupling selection

Jaw couplings mainly come in two types: the traditional straight-jaw type and the zero-backlash curved (concave) jaw type. 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 connecting servo motors, stepper motors, and ball screws. The curved shape reduces the deformation of the elastomeric 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 an elastomeric spider. The elastomeric spider has multiple lobes and, like a slider coupling, is compressed to fit snugly 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 elastomeric spider will be compressed, deformed, lose its elasticity, and eliminate preload, resulting in loss of zero-backlash performance, potentially leading to serious issues that may only be discovered later. Jaw couplings offer excellent balance and are suitable for high-speed applications (maximum speed up to 30000 rpm), but 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 failure mode. If the elastomeric spider fails or breaks, torque transmission is not interrupted; instead, the metal jaws of the two hubs engage directly to continue transmitting torque, which may cause system problems. Selecting the appropriate elastomeric spider material based on actual application requirements is a major advantage of this coupling. Some automation equipment companies offer various elastomeric spiders with different hardness levels and temperature ratings, allowing customers to choose materials that meet their specific performance standards.

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