0806DU coupling Germany GGB model 0806DU price

0806DU coupling connects several sets of diaphragms (thin stainless steel plates) to the two half-couplings alternately with bolts. Each set of diaphragms consists of multiple stacked layers. Diaphragms are classified into link-type and solid-piece types of various shapes. The diaphragm coupling compensates for the relative displacement of the two connected shafts through the elastic deformation of the diaphragms. It is a high-performance metallic flexible coupling that requires no lubrication, has a compact structure, high strength, long service life, no rotational backlash, and is unaffected by temperature or oil contamination. It features acid and alkali resistance and corrosion protection, making it suitable for shafting drives operating in high-temperature, high-speed, and corrosive media environments.

0806DU 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-fork type, triple-ball pin type, hinge rod 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. Generally, prime movers are connected to working machines via couplings.

0806DU 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 absolute accurate alignment of the two shafts for cross-axis 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 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 safely and reliably transmit torque, the larger the allowable deviation of the shaft centers, the easier it is to meet 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.

0806DU Coupling Measurement Sequence

Misalignment of universal couplings may involve radial displacement, angular misalignment, or both. Coaxiality 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, coaxiality adjustment is inevitable during installation to ensure the coupling halves are both concentric and parallel; otherwise, it will affect pump efficiency or cause equipment failure. For some large high-temperature equipment, temperature-induced linear expansion causing base elevation should also be considered during coupling alignment. Measurement can be performed in the following sequence: 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 mark 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 face gap first, then 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 axial gap to make the two halves parallel, then adjust radial gap to make them concentric. If the equipment manufacturer has no specific requirements, for shaft speed 2980rmin, the universal coupling shaft gap (concentricity) and face gap (parallelism) errors generally should not exceed 0.03mm; for shaft speed 1500rmin, the universal coupling shaft gap and face gap errors 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 significantly improve the speed of universal coupling alignment.

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