German reiff coupling, reiff model, reiff price

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

reiff coupling manufacturing process

Jaw couplings are manufactured by 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, the performance of cast components is not ideal, and they are best avoided in critical applications. Under high-speed or high-load conditions, the teeth of cast hubs are prone to breakage (tooth detachment). 1) Compact, backlash-free, with three different hardness elastomers available; 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 jaws; 6) Fixing methods include set screw, clamping, and keyway fixation.

reiff 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 damping effects, 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 axial, radial, and angular compensation capabilities. With a simple structure, small radial dimensions, light weight, and low moment of inertia, they are 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.

reiff 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 whether there are any foreign objects in the bores of the two half-couplings of the jaw coupling, and whether there is any damage to the inner edges of the bores. If present, clean the shafts and half-couplings thoroughly, and repair any damage with a fine file. Then check whether the inner bore 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 for the length of the half-couplings at the prime mover and driven machine ends to be 10–30mm shorter than their respective 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 3–4 points along the inner sides of the flanges of the half-couplings and take the average value. The error between this value and the sum of the measured dimensions of the spacer and the two disc packs should be controlled within the range of 0–0.4mm. 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 outer diameter of the flange is less than 250mm, the runout value should not exceed 0.05mm; when the outer diameter of the flange 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, and fit buffer sleeves and spring washers, then 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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