Mix door structure

A mix door structure including a slide door unit having:

• a frame-shaped slide door case having a pair of air passage ports as a warm-air opening and a cool-air opening;
• a slide door part attached to a pair of door attachment wall parts provided on both lateral sides of the slide door case, the slide door part being slidable along the slide door case to be capable of opening and closing the warm-air opening and the cool-air opening or adjusting opening degrees thereof;
• and
• a slide drive part capable of driving slide of the slide door part relative to the slide door case, wherein
• the slide drive part at least includes
• a rack part provided to the slide door part and extending in a direction in which the slide door part slides,
• an output gear meshing with the rack part, and
• an output shaft supporting the output gear between the pair of door attachment wall parts at a boundary of the warm-air opening and the cool-air opening,
• at least three or more of the slide door units are aligned in an axial direction of each of the output shafts,
• an input shaft including an input gear which meshes with the output gear and extending from the slide door unit located in a middle to the slide door unit located on an outermost side is placed in parallel with the output shaft of the outermost slide door unit, and is dividable into an inner input shaft part including at least the input gear, and an outer input shaft part,
• the inner input shaft part is rotationally supported on two sides at both end portions thereof on the pair of door attachment wall parts of the middle slide door unit,
• the outer input shaft part is rotationally supported on one side at an outer end thereof on the outer door attachment wall part of the outermost slide door unit, and
• an inner end portion of the outer input shaft part and the inner input shaft part are capable of being coupled to each other.