Hydraulic pressure supply device

A hydraulic pressure supply device comprising:

• a motor coupled to one side of a modulator block, which is provided with a flow path and a valve for adjusting a braking hydraulic pressure therein, and having a first hollow portion formed therein in which a rotary shaft is accommodated;
• a pump housing coupled to the other side of the modulator block and having a second hollow portion formed therein, the second hollow portion being in communication with the first hollow portion;
• a ball nut connected to the rotary shaft and converting a rotating movement of the rotary shaft into a linear movement;
• and
• a piston formed in a cylindrical shape through which a piston hole is formed in a lengthwise direction and of which one end is coupled to the ball nut so as to move along with the ball nut, and the other end is provided with a head portion having a diameter greater than a diameter of a body portion connected to the ball nut,
• wherein the piston is provided in the second hollow portion and is moved from a distant direction into a close direction of the motor so as to form a hydraulic pressure only in a single direction.