German FAG coupling FAG model FAG price

FAG couplings connect two half-couplings with bolts interleaving several sets of diaphragms (thin stainless steel plates). Each set of diaphragms consists of multiple stacked layers. 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 transmission in high-temperature, high-speed, and corrosive media environments.

FAG coupling introduction

They are divided into two main categories: convex and concave. Convex types are further divided into three types: integral with skeleton, integral without skeleton, and radial slit type. Their common feature is connecting the two half-couplings 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, with nuts welded at the bolt holes on the skeleton. During assembly, bolts connect to the flanges of the two half-couplings. 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 capability 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.

FAG 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 mode) 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 balance (correction) plane of the coupling. This process is called balance 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, known as 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 balance precision. The balance grade standard for tire couplings is assessed based on e.

FAG coupling maintenance

1) For jaw couplings, listen for abnormal noises or manually rotate the two half-couplings to check for excessive circumferential play. If present, the jaw rubber ring may be damaged; alternatively, check for looseness between the half-coupling and the shaft. 2) For flange couplings, if the bolt holes or pin holes in the two half-couplings are severely worn, typically re-machine the holes and fit suitable bolts, or weld and re-machine the holes. 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 half-coupling or gear coupling bushing and the shaft does not meet drawing requirements, or if there are significant scratches on the shaft due to key looseness, 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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