German SIEMENS coupling SIEMENS model SIEMENS price

SIEMENS coupling is a component that connects the prime mover to the driven machine. Its main function is overload protection. The torque limiter restricts the torque transmitted by the drive system in the form of slippage when the required torque exceeds the set value due to overload or mechanical failure. It automatically re-engages once the overload condition disappears. This prevents mechanical damage and avoids costly downtime losses.

SIEMENS coupling manufacturing process

The jaw coupling is machined using turning, milling, and broaching, followed by overall heat treatment to ensure sufficient mechanical strength. There is also a cast jaw hub available on the market, which allows for mass production and eliminates machining loss. Therefore, its price is much lower than that of machined parts. However, the performance of castings is not very good. It is best not to use them in critical applications. Furthermore, the jaws of cast hubs are prone to tooth breakage (jaw detachment) under high speed or high load conditions. 1) Compact, backlash-free, 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 and electrically insulating, operating temperature 20℃ to 60℃; 5) Jaw elastomers are available with four, six, eight, and ten lobes; 6) Fixing methods include set screw, clamping, and keyway fixation.

SIEMENS 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 the elastomer is subjected to compression rather than tension, its typical service life is 10 years. Due to the cushioning and vibration-damping effects of the elastomer, it is 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. The jaw coupling features a simple structure, requires no lubrication, is easy to maintain and inspect, is maintenance-free, and allows for continuous long-term operation. The high-strength polyurethane elastic element is wear-resistant and oil-resistant, offers high load capacity, long service life, and safe, reliable operation. It provides stable and reliable performance with good vibration damping, cushioning, and electrical insulation properties. It has significant axial, radial, and angular compensation capabilities. The structure is simple, with small radial dimensions, light weight, and low moment of inertia, making it 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.

SIEMENS coupling selection

Jaw couplings mainly come in two types: the traditional straight-jaw type and the curved (concave) jaw zero-backlash coupling. The traditional straight-jaw jaw coupling is not suitable for high-precision servo drive applications. The zero-backlash jaw coupling evolved from the straight-jaw type, but its design is suited for servo system applications, commonly used to connect servo motors, stepper motors, and ball screws. The curved shape reduces deformation of the elastic spider and limits the effect of centrifugal force on it during high-speed operation. The zero-backlash jaw coupling consists of two metal hubs (typically made of aluminum alloy, with stainless steel also available) and a jaw elastic spider. The elastic spider has multiple lobe branches. Like a slider coupling, it achieves fit between the elastic spider 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 elastic element specified by the manufacturer is not exceeded (while maintaining zero backlash). Otherwise, the elastic spider will be compressed and deformed, losing its elasticity and preload, resulting in loss of zero-backlash performance. This may lead to serious issues that are only discovered 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 will generate higher bearing loads compared to other servo couplings. Another concern is the failure mode of jaw couplings. Once the elastic spider is damaged or fails, torque transmission is not interrupted; instead, the metal jaws of the two hubs engage and continue to transmit torque, which may cause system problems. Selecting the appropriate elastic spider material based on actual applications is a major advantage of this coupling. Some automation equipment companies offer various elastic materials for jaw spiders with different hardness and temperature resistance, allowing customers to choose suitable materials to meet the performance standards of their specific applications.

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