Door opening and closing device for vehicle

A door opening and closing apparatus for a vehicle, the apparatus comprising:

• a door for opening and closing a door opening formed in a vehicle body;
• a spindle mounted on the vehicle body in a longitudinal direction of the vehicle body and configured to rotate;
• and
• a door arm including a first end portion rotatably connected to a first end portion of the door, and a second end portion pivotally coupled to the spindle and configured to move along the spindle and rotate according to a rotation of the spindle,
• wherein the first end portion of the door arm is rotatably connected to a door bracket provided in the door,
• wherein the second end portion of the door arm is rotatably connected to a nut bracket engaged to the spindle and configured to move along the spindle in the longitudinal direction of the vehicle body according to the rotation of the spindle,
• wherein the door arm is in plural,
• wherein the second end portion of at least one of the plurality of door arms is provided with:
• a first nut bracket coupled to the spindle and configured to move along the spindle in the longitudinal direction of the vehicle body according to the rotation of the spindle;
• a worm gear provided in the first nut bracket and being engaged to the spindle to rotate according to the rotation of the spindle;
• and
• a worm wheel gear rotatably mounted on the first nut bracket, connected to the second end portion of the at least one of the door arm, and being engaged to the worm gear to rotate according to a rotation of the worm gear to rotate the second end portion of the at least one of the door arms.