German SERAX coupling SERAX model SERAX price

The SERAX coupling connects two half-couplings with several sets of diaphragms (thin stainless steel plates) using bolts in an alternating arrangement. Each set of diaphragms consists of multiple stacked layers. The diaphragms are categorized into link-type and solid-piece types of various shapes. The diaphragm coupling compensates for the relative displacement between the two connected shafts through the elastic deformation of the diaphragms. It is a high-performance flexible metallic element coupling that requires no lubrication, features a compact structure, high strength, long service life, and zero rotational backlash. It is unaffected by temperature or oil contamination, offers acid, alkali, and corrosion resistance, and is suitable for shaft system transmission in high-temperature, high-speed, and corrosive media environments.

SERAX Coupling Structure and Applications

Universal couplings come in various structural types, such as: cross-axis type, ball cage type, ball fork type, cam type, ball pin type, ball joint type, ball joint plunger type, three-pin type, triple-yoke type, triple-ball-pin type, hinge-yoke type, etc. 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 magnitude. They are mechanical components used to connect two shafts (drive shaft and driven shaft) in different mechanisms, enabling them to rotate together to 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 generally connected to the working machine via a coupling.

SERAX 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 collinear 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 continuously for machines in continuous operation is even more challenging. Uneven thermal expansion of universal coupling components, shaft deflection, uneven bearing wear, machine displacement, and uneven foundation settlement are all reasons why maintaining shaft alignment is difficult. 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 transmit torque safely and reliably, the larger the allowable deviation between the two shaft centers, the easier it is to meet requirements during installation. However, from an installation quality perspective, the smaller the deviation between the two 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 installers.

SERAX 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. For pump units connected by cross-axis universal couplings, concentricity adjustment is inevitable during installation to ensure the coupling halves are both concentric and parallel; otherwise, it will affect pump efficiency or cause equipment operation accidents. For some large high-temperature equipment, factors such as base height increase due to thermal linear expansion should also be considered during coupling alignment. 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, causing the special tool or alignment line to rotate sequentially through 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, adjustment is required. During adjustment, first adjust the pump levelness, then use the pump's universal coupling as the reference to measure and adjust the motor coupling half to ensure the motor and pump are coaxial and concentric. When adjusting coupling concentricity, 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 shaft speed 2980rmin, the shaft gap (concentricity) and face gap (parallelism) errors of general universal couplings should not exceed 0.03mm; for shaft speed 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, taking into account the influence of shaft gap adjustment on face gap, to perform calculation-based alignment, which can greatly improve the speed of universal coupling alignment.

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