German TSUBAKI coupling TSUBAKI model TSUBAKI price

TSUBAKI couplings consist of components such as an internal gear ring with the same number of teeth and a flanged half-coupling with external teeth. External teeth are available in two tooth profiles: straight teeth and crowned teeth. Crowned teeth refer to external teeth machined into a spherical surface, with the center of the sphere on the gear axis. The backlash is larger than that of standard gears. Crowned tooth couplings allow greater angular misalignment (compared to straight-tooth couplings), improve tooth contact conditions, increase torque transmission capacity, and extend service life. During operation of gear couplings, relative displacement occurs between the two shafts, and the tooth surfaces of the internal and external gears periodically slide axially relative to each other, inevitably causing tooth surface wear and power loss. Therefore, gear couplings must operate under good lubrication and sealing conditions.

TSUBAKI coupling manufacturing process

Jaw couplings are manufactured through machining processes such as turning, milling, and broaching, followed by overall heat treatment to ensure sufficient mechanical strength. There is also a type of jaw hub on the market that is cast, allowing for mass production and eliminating machining losses. Therefore, the 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 tooth detachment) under high speed or high load conditions. 1) Compact, backlash-free, with three different hardness elastomers; 2) Absorbs vibration, compensates for radial and angular misalignment; 3) Simple structure, easy maintenance, convenient inspection; 4) Maintenance-free, oil-resistant, electrically insulating, operating temperature 20℃ to 60℃; 5) Jaw elastomers are available in four-lobe, six-lobe, eight-lobe, and ten-lobe configurations; 6) Fixing methods include set screw, clamping, and keyway fixation.

TSUBAKI 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 the damping and vibration isolation properties of elastomers, 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 can operate continuously for long periods. High-strength polyurethane elastic elements are wear-resistant and oil-resistant, offer high load capacity, long service life, and safe, reliable operation. They provide stable and reliable performance with good vibration damping, buffering, and electrical insulation properties. They offer significant axial, radial, and angular compensation capabilities. The simple structure results in a small radial dimension, low weight, and low moment of inertia, making them suitable for medium to high-speed applications. Structural features: 1) Connected via a central elastomer. 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.

TSUBAKI coupling selection

Jaw couplings are mainly available 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 their design is suited for servo system applications, commonly used to connect servo motors, stepper motors, and ball screws. The curved profile 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 made of aluminum alloy, with stainless steel also available) and a jaw elastic spider. The jaw elastic spider has multiple lobes. 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 jaw elastic spider will be compressed, deformed, and lose its elasticity, causing the preload to disappear and resulting in loss of zero-backlash performance. This may lead to serious issues that users might only discover later. 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 concern is the failure mode of jaw couplings. Once the jaw 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 jaw elastic spider material for the actual application is a major advantage of this coupling. Some automation equipment companies offer jaw spiders made of various elastic materials 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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