German CSK 25 coupling, CSK 25 model, CSK 25 price

CSK 25 couplings connect two flanged half-couplings to their respective shafts using standard parallel keys, and then bolt the two half-couplings together to transmit motion and torque. This type of coupling has two main structural forms: (1) achieves shaft alignment through bolts in reamed holes and transmits torque via compression and shear on the bolt shanks; (2) achieves alignment by mating a spigot on one half-coupling with a recess on the other. The bolts connecting the two half-couplings can be grade A and grade B standard bolts, with torque transmitted through the frictional moment at the mating surfaces of the two half-couplings.

CSK 25 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 cast jaw hub available on the market, which allows for mass production and eliminates 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. Furthermore, the jaws of cast hubs are prone to tooth breakage (jaw 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 and electrically insulating, operating temperature 20℃ to 60℃; 5) Jaw elastomers are available in four-jaw, six-jaw, eight-jaw, and ten-jaw configurations; 6) Fixing methods include set screw, clamping, and keyway fixation.

CSK 25 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 elastic 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 compensation capabilities for axial, radial, and angular misalignment. The structure is simple, with small radial dimensions, low weight, and low moment of inertia, making 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.

CSK 25 coupling installation method

1) Before installation, first check whether the shafts of the prime mover and the driven machine are concentric, and whether there is any packaging paper or damage on the shaft surfaces. Check if there are any foreign objects in the bores of the two half-couplings of the jaw coupling, and whether the bore edges are damaged. If so, clean the shafts and half-couplings thoroughly, and use a fine file to repair any damage. Then check whether the inner diameter and length of the two half-couplings match the diameter and shaft extension length of the prime mover and driven machine. Generally, when selecting models, it is advisable to make the length of the half-couplings on the prime mover and driven machine ends 10 to 30mm shorter than their shaft extension lengths. 2) To facilitate installation, it is best to preheat the two half-couplings in an oven or oil bath at 120–150, causing the bore size to expand for easier mounting. After installation, ensure that the shaft end does not protrude beyond the face of the half-coupling; flush alignment is preferred. Check the distance between the two half-couplings: measure readings at 3 to 4 points along the inner sides of the flanges of the half-couplings, take the average, and compare it with the sum of the measured dimensions of the spacer and the two disc packs. The error between the two should be controlled within the range of 0 to 0.4mm. 3) Alignment: Use a dial indicator to check the face runout and outer diameter runout of the flanges of the two half-couplings. When the flange outer diameter is less than 250mm, the runout value should not exceed 0.05mm; when the flange outer diameter is greater than 250mm, the runout value should not exceed 0.08. 4) Install bolts: Insert the bolts from the outside of the small holes in one flange, pass them through the outside of the large holes in the other flange, fit the buffer sleeves and spring washers, and tighten the nuts with a wrench. If installation is improper or removal/replacement is required, ensure that the shafts and half-couplings are not damaged. After installation, rotation should be smooth without binding. 5) Operator notes: Before starting the equipment, check whether the nuts of the jaw coupling are loose or missing. If so, tighten the nuts promptly with a wrench.

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