German MEGADYNE coupling MEGADYNE model MEGADYNE price

MEGADYNE couplings connect several sets of diaphragms (thin stainless steel plates) to the two coupling halves with staggered bolts. 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.

MEGADYNE coupling introduction

They are divided into two main categories: convex and concave. The convex type is further divided into three types: integral with skeleton, integral without skeleton, and radial slit. Their common feature is connecting the two coupling halves with bolts via a tire ring to achieve shaft connection. The inner side of the tire ring is bonded to a steel skeleton using vulcanization, and nuts are welded at the bolt holes on the skeleton. During assembly, bolts connect to the flanges of the two coupling halves. Torque is transmitted through the friction generated between the tire and the flange end faces by tightening the bolts. The tire ring undergoes torsional shear deformation during operation, giving tire couplings high elasticity, significant capacity to compensate for relative shaft displacement, and good damping. They also have a simple structure, require no lubrication, and are easy to assemble, disassemble, and maintain.

MEGADYNE coupling imbalance phenomena

Due to various reasons, the center of mass or principal axis of inertia of a tire coupling may not coincide with its axis of rotation. This results in unbalanced centrifugal inertial forces, centrifugal inertial couples, and dynamic deflection (vibration modes) during operation, known as rotor imbalance. This imbalance inevitably causes vibration in the shaft system, affecting normal machine operation and service life, so it must be addressed. To correct or minimize the imbalance of tire couplings, select an appropriate balance grade as needed. After manufacturing and installation on the machine, achieve the required balance grade by adding or removing appropriate mass on the specified balancing (correction) plane of the coupling. This process is called balancing correction, or simply balancing. The degree of imbalance (imbalance amount U) is usually expressed by the product mr of the rotor mass m and the distance r from the center of mass to the rotor axis of rotation, known as the mass-radius product. It can also be expressed as the mass-radius product per unit mass, called eccentricity e (not geometric eccentricity). The mass-radius product mr is a relative quantity related to rotor mass, while eccentricity e is an absolute quantity independent of rotor mass. The former is more intuitive and commonly used for balancing specific rotors, while the latter is used to evaluate rotor balance quality or detect balancing precision. The balance grade standard for tire couplings is assessed based on e.

MEGADYNE coupling maintenance

1) For jaw couplings, listen for abnormal noises or manually rotate the two coupling halves to check for excessive circumferential play. If present, the jaw rubber ring may be damaged, or check for looseness between the coupling half and the shaft. 2) For flange couplings, if the connecting bolt holes or pin holes of the two coupling halves are severely worn, typically re-machine the holes and fit suitable bolts, or fill the holes with electric welding and re-machine. 3) For slider couplings, monitor lubrication conditions. 4) For gear couplings, inspect the tooth profile using calipers, span micrometers, or templates. Replace if tooth thickness wear exceeds 5~30% of the original tooth thickness; for running mechanism gear couplings, the limit is 20~30%. 5) Check gear coupling sealing devices, retaining rings, expansion rings, springs, etc., for damage or aging, and replace promptly if found. 6) If the fit between the coupling half or gear coupling bushing and the shaft does not meet drawing requirements, or if there are significant scratches on the shaft due to key loosening, repair promptly. Generally, only repair the coupling or bushing; do not repair the shaft to prevent shaft breakage accidents. 7) Regularly add lubricating oil to couplings requiring lubrication. Slider couplings, universal joints, chain couplings, etc., all require regular lubrication. Our company uses many universal joints, especially in the packaging workshop.

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