German GMN coupling GMN model GMN price

GMN couplings 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. The inner side of the tire ring is bonded to the steel skeleton by vulcanization, and nuts are welded at the bolt holes on the skeleton. During assembly, bolts are used to connect the flanges of the two half-couplings. Torque is transmitted by the friction generated between the tire and the flange end faces when the bolts are tightened. 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, good damping, a simple structure, requires no lubrication, and is easy to assemble, disassemble, and maintain. Its disadvantages are low load capacity and large overall dimensions. As the relative torsion angle between the two shafts increases, the tire shape becomes distorted, the axial dimension slightly decreases, generating significant additional axial forces on the two shafts, which increases bearing load and reduces service life. When the tire coupling operates at high speed, the outer edge of the tire expands outward due to centrifugal force, further increasing the additional axial force. Therefore, measures should be taken during coupling installation to make the stress direction in the tire opposite to the stress direction generated during operation, to offset part of the additional axial force and improve the working conditions of the coupling and the two bearings.

GMN coupling structure

Consists of two hub sleeves and one center slider. The center slider, serving as a torque transmission element, is typically made of engineering plastic; in special cases, other materials such as metal may be selected. The center slider is connected to the hub sleeves on both sides via slots arranged at 90° relative to each other, thereby achieving torque transmission. A slight interference fit is maintained between the center slider and the hub sleeves, enabling zero-backlash operation of the coupling during equipment operation. Over time, the slider may lose its backlash-free function due to wear; however, the center slider is inexpensive and easy to replace, restoring original performance after replacement. Slider couplings are commonly used with standard motors and, in individual cases, can also be used to connect servo motors, correcting relative displacement through the sliding of the center slider during use. Since the half-coupling and the intermediate disc form a translational pair and cannot rotate relative to each other, the angular velocities of the driving and driven shafts must be equal. However, when operating with relative displacement between the two shafts, the intermediate disc generates significant centrifugal force, thereby increasing dynamic loads and wear. Therefore, care must be taken during selection to ensure the operating speed does not exceed the specified value. This type of coupling is generally used for speeds n<250r/min, where shaft stiffness is high and there are no severe impacts.

GMN coupling features

The material for slider coupling parts can be 45 steel, with heat treatment required on the working surfaces to increase hardness; for lower requirements, Q275 steel can be used without heat treatment. To reduce friction and wear, oil should be injected through the oil hole in the intermediate disc for lubrication during use. Since the half-coupling and the intermediate disc form a sliding pair and cannot rotate relative to each other, the angular velocity of the driving shaft and the driven shaft must be equal. However, when operating with relative displacement between the two shafts, the intermediate disc generates significant centrifugal force, increasing dynamic load and wear. Therefore, care should be taken during selection to ensure the operating speed does not exceed the specified value. This type of coupling is generally used for speeds n<250r/min, where shaft stiffness is high and there are no severe impacts. A slight interference fit is maintained between the center slider and the hub sleeves, enabling zero-backlash operation of the coupling during equipment operation. Over time, the slider may lose its backlash-free function due to wear; however, the center slider is inexpensive and easy to replace, restoring original performance after replacement. Slider couplings are commonly used with standard motors and, in individual cases, can also be used to connect servo motors, correcting relative displacement through the sliding of the center slider during use. Since the resistance to relative displacement is provided by the friction between the slider and the hub sleeves, the bearing load between them does not increase with greater relative displacement. Slider couplings can eliminate additional inter-shaft loads during automatic motor control. The fixed body uses internal splines for sliding, while the inner and outer sleeves within the sliding body can move relatively in the axial direction. This coupling integrates sliding and rotation functions. For the same rotational diameter, its shortest dimension is significantly smaller than that of a cross-axis coupling. It improves the uniformity of load distribution on the working surface and can transmit higher torque, though elasticity is slightly reduced.

GMN coupling applications

Unlike other couplings, the slider coupling has no elastic elements that work like springs, so bearing load does not increase with increased relative displacement between shafts. Regardless, this series of couplings offers good value for money, and the ability to choose sliders of different materials is the greatest advantage of this coupling. Juren Company can provide a variety of raw material options for center sliders to suit different applications based on specific customer requirements. Generally, one type of material is suitable for zero-backlash, high-torque rigidity, and high-torque conditions, while another type is suitable for low-precision positioning, where zero-backlash is not required, but vibration absorption and noise reduction functions are needed. Non-metallic sliders also have excellent electrical insulation properties and can serve as mechanical fuses. When the engineering plastic slider is damaged, torque transmission is completely terminated, thereby protecting valuable mechanical parts. This design is suitable for large parallel relative displacements. The three-part design of the slider coupling limits its ability to compensate for axial deviations, so it cannot be used in push-pull applications. Meanwhile, because the center slider is floating, the motion of the two shafts must ensure that the slider does not detach.

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