Motor assembly of bridge cutting machine

The invention relates to a motor assembly of a bridge cutting machine. The motor assembly comprises a motor and a tool arranged on an output shaft. The motor assembly is characterized in that a rectangular engine base is sleeved outside a motor, the front and rear ends of the engine base are respectively provided with a front end cover and a rear end cover, the two ends of a motor rotor shaft are respectively positioned on the front and rear end covers through bearings, and the outer side of the bearing is provided with an oil seal; water gaps are respectively arranged close to the four corners of the front and rear end covers; the rotor shaft is of a hollow structure, the front end of the rotor shaft is provided with a cone port, and an convex key is processed on the end face of the cone port; one end of the output shaft is provided with a cone head part, and the other end of the output shaft is provided with an interface for fixing the tool; the cone base of the cone head part is provided ...