German TAS SCHAFER coupling, TAS SCHAFER model, TAS SCHAFER price

TAS SCHAFER couplings connect several sets of diaphragms (thin stainless steel plates) to the two half-couplings with bolts in a staggered arrangement. Each set of diaphragms consists of multiple stacked layers. The diaphragms are available in link-type and various shapes of single-piece types. Diaphragm couplings compensate for the relative displacement of the two connected shafts through the elastic deformation of the diaphragms. They are high-performance metallic flexible couplings that require no lubrication, have a compact structure, high strength, long service life, no rotational backlash, and are unaffected by temperature or oil contamination. They feature acid, alkali, and corrosion resistance, making them suitable for shaft drive systems in high-temperature, high-speed, and corrosive media operating environments.

TAS SCHAFER Coupling Structure and Applications

Universal couplings come in various structural types, such as: cross-axis type, ball cage type, ball fork type, block type, ball pin type, ball joint type, ball joint plunger type, three-pin type, triple-yoke type, triple-ball-pin type, and hinge-yoke type. The most common is the cross-axis type, followed by the ball cage type. In practical applications, they are classified into heavy-duty, medium-duty, light-duty, and small-sized based on the transmitted torque. These mechanical components connect two shafts (drive shaft and driven shaft) in different mechanisms to rotate together and transmit torque. In high-speed, heavy-load power transmission, some couplings also provide buffering, vibration damping, and improved dynamic performance of the shaft system. A coupling consists of two halves, each connected to the drive shaft and driven shaft respectively. Most prime movers are connected to working machines via couplings.

TAS SCHAFER Coupling Alignment Process

Alignment of universal couplings is one of the important tasks in machine installation. The purpose of alignment is to ensure that the centerlines of the drive shaft and driven shaft are on the same straight line during machine operation. Alignment accuracy affects whether the machine can operate normally, which is especially critical for high-speed machinery. Achieving absolutely accurate alignment of the two shafts for cross-type universal couplings is difficult, and maintaining accurate alignment for continuously operating machines is even more challenging. Uneven thermal expansion of components, shaft deflection, uneven bearing wear, machine displacement, and uneven foundation settlement are all reasons why it is difficult to maintain shaft alignment. Therefore, an allowable deviation value for the two shaft centers is specified during machine design, which is also required during coupling installation. From an assembly perspective, as long as the coupling can safely and reliably transmit torque, the larger the allowable deviation of the shaft centers, the easier it is to meet the requirements during installation. However, from an installation quality perspective, the smaller the deviation of the shaft centerlines, the more precise the alignment, the better the machine operation, and the longer the service life. Therefore, the allowable deviation for shaft alignment during universal coupling installation should not be regarded as a margin left by careless construction by the installer.

TAS SCHAFER Coupling Measurement Sequence

Misalignment of universal couplings may involve radial displacement, angular misalignment, or both. Concentricity measurement should be performed at four evenly distributed positions on the end face and circumference of the universal coupling. During the installation of pump units connected by cross-axis universal couplings, concentricity adjustment is inevitable to ensure the coupling halves are both concentric and parallel; otherwise, it will affect the efficiency of the pump unit or cause equipment operation accidents. For some large high-temperature equipment, factors such as increased equipment base height due to thermal linear expansion should also be considered during coupling alignment. The measurement can be performed in the following order: 1) Temporarily connect half-universal coupling A and B, and set up special tools. 2) Rotate half-couplings A and B simultaneously so that the special tool or alignment mark sequentially turns to the four positions. At each position, measure the radial values (or gaps) and axial values of the two half-couplings. Install BJ. If the universal coupling is found to be misaligned or non-parallel, adjustments must be made. During adjustment, first adjust the levelness of the pump unit, then use the universal coupling of the pump unit as the reference to measure and adjust the motor coupling half to ensure the motor and pump unit are coaxial and concentric. When adjusting the concentricity of the coupling, adjust the face gap first, then the shaft gap. When adjusting the motor, shims of different thicknesses can be used under the motor base according to d and mouth values. First, adjust the axial gap to make the two halves parallel, then adjust the radial gap to make the two halves concentric. If the equipment manufacturer has no specific requirements, for a shaft speed of 2980rmin, the shaft gap (concentricity) and face gap (parallelism) errors of the general universal coupling should not exceed 0.03mm; for a shaft speed of 1500rmin, the shaft gap and face gap errors of the universal coupling should not exceed 0.05mm. During coupling alignment, the principle of similar triangles can be used to account for the influence of shaft gap adjustment on face gap, allowing for calculation-based alignment, which can greatly improve the speed of universal coupling alignment.

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