Coupling structure of ball nut and damper and hydraulic supply apparatus employing the same

A hydraulic supply apparatus comprising:

• a screw rotatably provided by receiving a rotational force generated by a motor,
• a ball nut threadedly coupled to the screw to move linearly along an axial direction of the screw through rotation of the screw;
• a piston coupled to the ball nut to move linearly together with the ball nut to generate hydraulic pressure;
• a bushing member provided between the piston and a rotor and having one end portion fixed to a modulator block;
• and
• a damper tightly coupled to an outer circumferential surface of the ball nut to prevent the ball nut from rotating by being supported in a rotational direction by the bushing member and prevent deviation in the axial direction from the ball nut when the ball nut moves linearly,
• wherein the ball nut comprises one or more fitting grooves formed on an outer circumferential surface thereof in a circumferential direction with a predetermined width, and the damper comprises one or more fitting protrusions formed on an inner circumferential surface thereof at positions corresponding to the fitting grooves, and
• wherein the fitting protrusions are provided in any one of 2 to 8 pieces and are disposed at predetermined intervals on the inner circumferential surface of the damper.