Hub-type electronic driving device

A hub-type electronic driving device comprising:

• a housing having a cup-shaped wheel and a cover having an outer circumferential portion which is coupled to an opening of the wheel;
• a motor shaft having both ends which are fixedly installed on a body outside the housing;
• first and second bearings installed in through-holes formed at the centers of the wheel and the cover, respectively, to rotatably support the housing around the motor shaft;
• a BLDC motor which is contained in the housing so as to rotate the housing around the motor shaft;
• a rotor in which a back yoke and a magnet are stacked on a cylindrical inner wall of the cup-shaped wheel;
• a stator having an outer circumferential portion facing the magnet of the rotor with an air gap and having a central portion coupled to the outer circumference of the motor shaft to be fixed, and applying a rotating magnetic field to the rotor;
• a cable containing a plurality of wires for applying a motor driving signal to the BLDC motor from a motor driving circuit installed outside the housing;
• and
• a cable guide assembly installed between a first bearing supporting the wheel and the motor shaft to provide a shaft through-hole and a cable through-hole through which the motor shaft and a cable pass, respectively, and to maintain the sealing state of the shaft through-hole and the cable through-hole,
• wherein the motor shaft comprises:
• first and second body coupling parts having threads formed at both ends thereof to be screw-coupled to the frame of the body;
• a cable guide bracket coupling unit to which a cable guide bracket of the cable guide assembly is coupled;
• a stator coupling unit coupled to an integrated core frame of the stator in an intermediate portion of the stator by a key coupling method;
• and
• a brake body coupling unit to which a brake body of the brake device is coupled, and wherein
• a plurality of stepped portions that increase or decrease in diameter are formed between the first body coupling part, the cable guide bracket coupling unit, the stator coupling unit, the brake body coupling unit, and the second body coupling part, and the stepped portions define an installation position of each portion.