German fischer coupling fischer model fischer price

fischer couplings connect two flanged half-couplings to their respective shafts using standard parallel keys, 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 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 via the frictional moment at the interface of the two half-couplings.

fischer coupling manufacturing process

Jaw couplings are machined by 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 than machined versions. However, cast components do not perform as well and are best avoided in critical applications. Cast jaws are prone to tooth breakage (jaw tooth detachment) under high speed or high load conditions. 1) Compact, backlash-free, with three different elastomer hardness options; 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 in four, six, eight, and ten jaw configurations; 6) Fixing methods include set screw, clamping, and keyway fixation.

fischer 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 elastomeric elements are wear- and oil-resistant, have high load capacity, long service life, and are safe and reliable. They offer stable and reliable operation with good vibration damping, cushioning, and electrical insulation properties. They provide significant axial, radial, and angular compensation capabilities. The simple structure results in small radial dimensions, low weight, and low moment of inertia, making them suitable for medium to high-speed applications. Structural features: 1) Intermediate elastomer connection. 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.

fischer coupling installation method

1) Before installation, check whether the shafts of the prime mover and the driven machine are concentric, whether there is packaging paper or damage on the shaft surfaces, and whether there are foreign objects in the bores of the two half-couplings of the jaw coupling. Check for damage on the bore edges; if present, clean the shafts and half-couplings thoroughly, and repair any damage with a fine file. Then check whether the inner diameter and length of the bores of the two half-couplings match the diameter and shaft extension length of the prime mover and driven machine. Generally, when selecting models, ensure that the length of the half-couplings at the prime mover and driven machine ends is 10 to 30mm less 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 to expand the bore diameter for easier mounting. After installation, ensure the shaft end does not protrude beyond the face of the half-coupling; flush alignment is preferred. Measure the distance between the two half-couplings: take readings at 3 to 4 points along the inner sides of the flanges of the half-couplings and calculate the average. 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 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) Bolt installation: 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 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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