GC coupling is constructed by the mesh between internal spur gear of the coupling case and crowned external spur gear of the coupling center. Having involute tooth profile and special design for top and bottom of the teeth considering tilt and lubrication, ensures uniform speed and smooth power transmission even if a slight tilt occurs between case and center. Having two gear meshes, GC-SSM and GC-CCM can always keep the case in the neutral position and transmit power smoothly despite offset alignment, angular misalignment and axial gap. Having single gear mesh, GC-SEM and GC-CEM can accommodate angular misalignment and axial gap. As shown in Figure 5 on page 8 of its catalog, normally two units should be applied in combination using a floating shaft.
2．Major parts and their materials
GC Coupling Flexibility
When offset misalignment exists, the coupling gear tooth tilts by tanφ=δ／L as shown in Figure 1. When the shafts are concentric, the gear tooth is in contact at the crowned tooth center (Ro) as shown in Figure 3(a). However, when the shafts have offset or angular misalignment after installation,the gear tooth comes into contact at the point (R) away from the tooth center as shown in Figure 3(b). The larger the tilting angle is, the remoter point goes away from the center. Thus, the contact on arced surface ensures free and smooth meshing between internal gear and external gear under offset and angular misalignment. Our GC Couplings are designed and manufactured to have adequate crowning and backlash so that they can work freely and smoothly within allowable range.
Examples of Misalignment