Parking brake apparatus for vehicle

A parking brake apparatus for a vehicle, comprising:

• a motor section configured to generate power;
• a power transmission section configured to rotate by driving of the motor section;
• a pair of pressing units configured to receive power from the power transmission section, and press a brake pad;
• a load transmission unit installed between the pair of pressing units, connected to each of the pair of pressing units, and configured to transmit a pressing load of any one of the pair of pressing units to the other pressing unit;
• and
• a transmission gear section restraint unit configured to selectively restrain driving of the load transmission unit in conjunction with rotation of the power transmission section,
• wherein:
• each of the pair of pressing units comprises:
• a sun gear section configured to rotate by receiving power from the power transmission section;
• a planetary gear section configured to rotate by being meshed with the sun gear section;
• a carrier section coupled to the planetary gear section;
• and
• a piston section connected to the carrier section, and configured to press the brake pad by being moved toward the brake pad through receiving rotational power from the planetary gear section;
• the power transmission section comprises a small diameter transmission gear which is rotated by driving of the motor section, transmits power to the sun gear section through a connection gear section, and is coupled to the transmission gear section restraint unit;
• the small diameter transmission gear and the connection gear section are formed in the shapes of helical gears;
• and
• the small diameter transmission gear moves the transmission gear section restraint unit by being moved relative to the connection gear section when being rotated.