What are Lovejoy gear couplings? Lovejoy gear couplings connect rotating shafts of mechanical equipment by using gear mesh to accommodate inherent misalignment while transmitting power and torque between the shafts. There are caps on the flanks and exterior ring of the gear to allow angular movement between the gears. Gears automatically adjust proportionally to rotating splines with modified profiles. These Lovejoy gear couplings transmit power between the two ends of the coupling through the internal and external gears. Lovejoy gear couplings are very similar to flexible couplings and are capable of high torque transmission, making them ideal for heavy duty applications. They require periodic lubrication (grease) for optimum performance. These Lovejoy gear couplings feature a compact size for limited space applications.