German KOSTYRKA coupling KOSTYRKA model KOSTYRKA price

KOSTYRKA couplings are divided into two main categories: convex and concave. The convex type is further divided into three types: integral with skeleton, boneless integral, and radial slit. The inner side of the tire ring is bonded to the steel skeleton by vulcanization, and nuts are welded at the bolt holes on the skeleton. During assembly, bolts are used to connect the flanges of the two halves of the coupling. Torque is transmitted by the friction generated between the tire and the flange end face when the bolts are tightened. The tire ring undergoes torsional shear deformation during operation, so the tire coupling has high elasticity, a large ability to compensate for relative displacement of the two shafts, and good damping. Moreover, it has a simple structure, requires no lubrication, and is relatively convenient to assemble, disassemble, and maintain. Its disadvantages are low load capacity and large external dimensions. As the relative torsion angle between the two shafts increases, the tire shape becomes distorted, and the axial dimension slightly decreases, generating significant additional axial forces on the two shafts, which increases the bearing load and reduces service life. When the tire coupling operates at high speed, the outer edge of the tire expands outward due to centrifugal force, further increasing the additional axial force. Therefore, measures should be taken during coupling installation to make the stress direction in the tire opposite to the stress direction generated during operation, to offset part of the additional axial force and improve the working conditions of the coupling and the two bearings.

KOSTYRKA coupling features

1) One-piece metal elastic element; 2) Zero backlash, synchronous operation; 3) Elastic action compensates for radial, angular, and axial deviations; 4) High torque rigidity and excellent sensitivity; 5) Clockwise and counterclockwise rotation characteristics are identical; 6) Maintenance-free, oil-resistant, and corrosion-resistant; 7) Available in aluminum alloy and stainless steel materials; 8) Main fixation methods are set screw and clamping.

KOSTYRKA coupling application range

Flexible couplings are made of aluminum alloy. Some manufacturers also offer flexible couplings made of stainless steel. In addition to corrosion resistance, stainless steel flexible couplings also increase torque capacity and rigidity, even reaching twice that of aluminum alloy products of the same type. However, this increase in torque and rigidity is partially offset by the increased mass and inertia. Sometimes the negative effects outweigh the advantages, forcing users to seek other types of couplings.

KOSTYRKA coupling installation and fixation

1) Flexible coupling set screw fixation: Two set screws with a gap of 90º lock onto the fixed shaft. This is a traditional fixation method. Since the tip of the screw contacts the shaft center, it may cause damage to the shaft center or make disassembly difficult. 2) Lingsi flexible coupling clamping screw fixation: Uses the tightening force of hexagon socket head cap screws to contract the slit and tightly clamp the shaft center. This method is convenient for fixation and disassembly, does not damage the shaft center, and is a very common fixation method. 3) Flexible coupling keyway fixation: Suitable for high-torque transmission. To prevent axial sliding, it is usually used in combination with set screw fixation and clamping screw fixation. 4) Flexible coupling D-shaped hole fixation: Typically, if the motor shaft is D-shaped, and set screws cannot secure it, the coupling hole can be machined into a D-shaped hole corresponding to the motor shaft size. Used with set screw fixation, this prevents slipping. 5) Clamping hub fixation: Tightens the four set screws on the end face of the Lingsi coupling to compress the clamping hub for fixation. Suitable for connecting and fixing high-torque stepper motors and servo motors, such as clamping hub diaphragm couplings, clamping hub jaw couplings, clamping hub bellows couplings, and clamping hub flexible couplings.

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