Hydraulic pressure supply device of electronic brake system

A hydraulic pressure supply apparatus of an electronic brake system, the hydraulic pressure supply apparatus comprising:

• a motor coupled to a modulator block having a flow path and a valve for adjusting braking hydraulic pressure therein, the motor having a stator and a rotor disposed to be spaced apart from an inner circumferential surface of the stator;
• a first gear configured to receive a rotational force from the rotor and rotating together with the rotor;
• a second gear provided with a piston on one side thereof and concentrically connected with the first gear in a ball screw manner to convert a rotational motion of the first gear into a linear motion;
• and
• an anti-rotation unit configured to prevent the second gear from rotating together with the first gear,
• wherein
• the first gear is provided as a ball nut, and the second gear is provided as a screw shaft, the first gear and the second gear converting a rotational motion into a linear motion by a ball screw manner,
• an anti-rotation hole is formed on the other side of the second gear, and
• the anti-rotation unit comprises a rotation constraining member installed on a motor housing and having a guide shaft protruding to be inserted into the anti-rotation hole.

A hydraulic pressure supply apparatus of an electronic brake system, the hydraulic pressure supply apparatus comprising:

• a motor coupled to a modulator block having a flow path and a valve for adjusting braking hydraulic pressure therein, the motor having a stator and a rotor disposed to be spaced apart from an inner circumferential surface of the stator;
• a first gear configured to receive a rotational force from the rotor and rotating together with the rotor;
• a second gear provided with a piston on one side thereof and concentrically connected with the first gear in a ball screw manner to convert a rotational motion of the first gear into a linear motion;
• and
• an anti-rotation unit configured to prevent the second gear from rotating together with the first gear,
• wherein
• the first gear is provided as a ball nut, and the second gear is provided as a screw shaft,
• a nut bearing for a shaft support is integrally provided with the first gear, and
• the hydraulic pressure supply apparatus further comprises:
• a seating bush fitted into a fastening groove formed in the modulator block and having a protrusion extending in a motor direction at an edge thereof;
• a constraining member that covers the seating bush from the outside thereof and is coupled to the modulator block,
• wherein a flange portion protruding outward in a radial direction is integrally provided on an outer surface of the nut bearing, and the flange portion is fitted and constrained between the seating bush and the constraining member.

A hydraulic pressure supply apparatus of an electronic brake system, the hydraulic pressure supply apparatus comprising:

• a motor coupled to a modulator block having a flow path and a valve for adjusting braking hydraulic pressure therein, the motor having a stator and a rotor disposed to be spaced apart from an inner circumferential surface of the stator;
• a first gear configured to receive a rotational force from the rotor and rotating together with the rotor;
• a second gear provided with a piston on one side thereof and concentrically connected with the first gear in a ball screw manner to convert a rotational motion of the first gear into a linear motion:
• an anti-rotation unit configured to prevent the second gear from rotating together with the first gear;
• and
• a sleeve coupled to the rotor to rotate together with the rotor, and having an accommodation space formed in a center thereof.