Large scale motor and speed reducer coaxiality detector

A large scale motor and speed reducer coaxiality detector relates to a motor and speed reducer matched installation debug auxiliary tool, and especially belongs to a large scale motor and speed reducer coaxiality detector comprising a connecting member and an extension member; the connecting member comprises a link plate (1), an isolation plate (2) and a connecting bolt (5); the extension member comprises a wheel disc (3) and a transverse rod (4); the link plate is connected with the wheel disc through the isolation plate; a center of the link plate, the isolation plate and the wheel disc is provided with a through hole matched with the bolt; one end of the transverse rod is arranged on an edge of the wheel disc, and the other end of the transverse rod points to the speed reducer (7) so as to be assembled with an indicating gauge (8). The large scale motor and speed reducer coaxiality detector is simple in structure, convenient in installation, and can accurately detect in detections.