German GKN Stromag coupling GKN Stromag model GKN Stromag price

GKN Stromag coupling is a component that connects the prime mover to the driven machine. Its main function is overload protection. The torque limiter restricts the torque transmitted by the drive system by slipping when the required torque exceeds the set value due to overload or mechanical failure. It automatically re-engages once the overload condition disappears. This prevents mechanical damage and avoids costly downtime losses.

GKN Stromag coupling introduction

Divided into two major categories: convex and concave. The convex type is further divided into three types: integral with skeleton, integral without skeleton, and radial slit type. Their common feature is that the tire ring is bolted to connect the two halves of the coupling to achieve shaft connection. The inner side of the tire ring is bonded to the steel skeleton by vulcanization. Nuts are welded at the bolt holes on the skeleton. During assembly, bolts are used to connect the flanges of the two coupling halves. Torque is transmitted by the friction generated between the tire and the flange end faces by tightening the bolts. The tire ring undergoes torsional shear deformation during operation, so the tire coupling has high elasticity, a large ability to compensate for relative displacement between two shafts, and good damping. Moreover, it has a simple structure, requires no lubrication, and is convenient to assemble, disassemble, and maintain.

GKN Stromag coupling imbalance phenomenon

Due to various reasons, the center of mass or principal axis of inertia of a tire coupling does not coincide with its axis of rotation. During operation, this produces unbalanced centrifugal inertial forces, centrifugal inertial couples, and dynamic deflection (mode shape), known as rotor imbalance. This imbalance inevitably causes vibration in the shaft system, affecting normal machine operation and service life, so it must be taken seriously. To correct or minimize the imbalance of tire couplings, an appropriate balance grade should be selected as needed. After product manufacturing and installation on the machine are completed, balance is achieved on the specified balance (correction) plane of the coupling by adding or removing appropriate mass to meet the balance grade requirements. 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 is often used for balancing operations on specific rotors, while the latter is used to evaluate the quality of rotor balance or detect balance precision. The balance grade standard for tire couplings is evaluated based on e.

GKN Stromag 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; alternatively, check if the half-coupling is loose on the shaft. 2) For flange couplings, if the connecting bolt holes or pin holes of the two halves are severely worn, the usual method is to machine the holes and fit suitable bolts, or to fill the holes with electric welding and re-machine them. 3) For slider couplings, pay attention to lubrication conditions. 4) For gear couplings, inspect the tooth profile using calipers, span micrometers, or templates. If tooth thickness wear exceeds 5~30% of the original tooth thickness, replace the coupling; for running mechanism gear couplings, the limit is 20~30%. 5) Check that the sealing devices, retaining rings, expansion rings, springs, etc., of the gear coupling are not damaged or aged; otherwise, replace them promptly. 6) If the fit between the half-coupling or gear coupling sleeve and the shaft does not meet drawing requirements, or if there are significant scratches on the shaft due to key loosening, perform timely repairs. Generally, only the coupling or sleeve is repaired; shaft repair is not permitted to prevent shaft breakage accidents. 7) Lubricate couplings requiring lubrication regularly. Slider couplings, universal joints, chain couplings, etc., all require regular oiling and lubrication. Our company uses universal joints extensively, especially in the packaging workshop.

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