Door mechanism of automobile air conditioner

An automotive air conditioning device comprising:

• a case;
• an upstream air passage defined in said case;
• two downstream air passages defined in said case and branched from said upstream air passage;
• a curved slide door arranged to slide along a curved given path extending in front of inlet portions of said two downstream air passages to open and close said inlet portions, said curved slide door including a concave front surface and a convex rear surface, said curved given path being swelled in a downstream direction;
• a slide mechanism for driving said slide door along said curved given path, said slide mechanism including at least one arcuate toothed portion formed on said concave front surface of said curved slide door, at least one gear rotatably held by said case and operatively meshed with said at least one arcuate toothed portion, a drive device for driving and rotating said at least one gear, an arcuate cam groove of predetermined radius of curvature formed in said case and being swelled in a downstream direction, and a guide member attached to a door proper portion of said slide door and slidably engaged with said arcuate cam groove;
• an evaporator installed in said upstream air passage at a position upstream of said slide door;
• and
• a heater core installed in one of said two downstream air passages at a position downstream of said slide door,
• wherein said case is constructed by coupling two case segments in a face-to-face connecting manner and,
• wherein a supporting roller is rotatably held by said two case segments and resiliently abuts against said door proper portion.