Provided is a small plug door device having a slide base is installed slidably in a vehicle width direction relative to a fixed base. A door drive mechanism for moving one door in a vehicle front-rear direction via a connecting portion has a drive portion including an electric motor, a drive wheel member, a follower wheel member, and an endless member, and is installed on the slide base. A guide portion guides a shaft portion provided on the connecting portion so as to move the shaft portion in a vehicle width direction. In a double-speed rail in which a pinion is disposed between two racks, one rack is connected to the slide base, the other rack is connected to the door side, and the pinion is connected to the connecting portion.

An opening and closing structure of a sliding door for a vehicle includes: a sliding door disposed on a side surface of the vehicle and configured to be slidably open and closed in a longitudinal direction of the vehicle; at least one rail arranged in a longitudinal direction of the vehicle on one of a vehicle body of the vehicle and the sliding door; at least one roller arranged on the other one of the vehicle body and the sliding door, the at least one roller configured to slide while being fitted in the at least one rail; and a sliding unit disposed on a side of the vehicle body or the sliding door on which the at least one roller is arranged, the sliding unit configured to slide the at least one roller in a direction in which the sliding door slides. The at least one roller is configured to slide with respect to the vehicle body and the sliding door.

An opening and closing structure of a sliding door for a vehicle includes: a sliding door disposed on a side surface of the vehicle and configured to be slidably open and closed in a longitudinal direction of the vehicle; at least one rail arranged in a longitudinal direction of the vehicle on one of a vehicle body of the vehicle and the sliding door; at least one roller arranged on the other one of the vehicle body and the sliding door, the at least one roller configured to slide while being fitted in the at least one rail; and a sliding unit disposed on a side of the vehicle body or the sliding door on which the at least one roller is arranged, the sliding unit configured to slide the at least one roller in a direction in which the sliding door slides. The at least one roller is configured to slide with respect to the vehicle body and the sliding door.

A sliding door device for laterally opening a door of a passenger vehicle includes a door and a drive device for moving the door transversely to and along the longitudinal axis of the vehicle. The door is flush with the lateral wall of the vehicle in the closed state, and in the open state, the door lies outside against the lateral wall. The drive device is arranged below or above the door opening and includes a support to which a first rotor is movably attached along the longitudinal axis of the support. A second rotor can be moved relative to the support along the longitudinal axis of the support by moving the first rotor, the door is attached to the second rotor, and the support is movably mounted relative to the vehicle transversely to the longitudinal axis of the vehicle. The first rotor is connected to a driving element which is guided within a first guide track that is fixed to the vehicle, and a second guide track is located on the vehicle on the door opening side opposite the drive device, a guide element which is connected to the door guided in the second guide track.

A door open-close device for a vehicle configured to open or close a door opening portion by sliding and moving and popping up a door formed in a vehicle body includes a driving unit configured to provide a driving force for sliding and pop-up operations of the door; a latch assembly configured to receive the driving force from the driving unit and cause the door to pop up; a pulley-belt unit engaged to the driving unit and configured to receive the driving force from the driving unit and allow the door to slide and move; and a rail unit connected to the door and configured to provide a path for the door to slide and move by operation of the pulley-belt unit.

A door open-close device for a vehicle configured to open or close a door opening portion by sliding and popping up a door formed in a vehicle body includes a driving unit configured to provide a driving force for sliding and pop-up operations of the door; a gear unit configured to receive the driving force from the driving unit and cause the door to pop up; a pulley-belt unit configured to receive the driving force from the driving unit and allow the door to slide; and a rail unit engaged to the pulley-belt unit, connected to the door and configured to provide a path for the door to slide by operation of the pulley-belt unit.