This standard stipulates the types, basic parameters and main dimensions of LZ, LZD, LZJ and LZZ elastic pin gear couplings (hereinafter referred to as couplings), and provides technical requirements, inspection rules and signs. , packaging and storage. This standard is applicable to the transmission shaft system connecting two coaxial shafts, and has the performance of compensating the relative offset of the two shafts and general vibration reduction. The working temperature is -20℃~+70℃, and the transmission nominal torque is 112N·m~2800000N·m.