Patent ID: 7108599
Filing Date: 2006-09-19
Classification: B60H,F16K,F24F,Y02T

Abstract:
1. A vehicle air conditioning system comprising: a case that conducts air toward a passenger compartment of a vehicle; door means for controlling a flow of air in the case; and a door drive mechanism that drives the door means, wherein: the door drive mechanism includes: the driven side gear is connected to the door means and is rotated to drive the door means upon rotation of the driving side gear; a pitch circle radius of the toothed portion of the driving side gear progressively changes in a predetermined circumferential direction of the driving side gear; a pitch circle radius of the toothed portion of the driven side gear progressively changes in conformity with a change in the pitch circle radius of the toothed portion of the driving side gear, and a heating heat exchanger that is received in the case and heats air in the case, wherein: the case includes: the discharge opening discharges one of: in the maximum cooling position, the door means fully opens the cool air passage and fully closes the warm air passage; in the maximum heating position, the door means fully closes the cool air passage and fully opens the warm air passage; the pitch circle radius of a maximum heating position side part of the toothed portion of the driving side gear, which is meshed with a maximum heating position side part of the toothed portion of the driven side gear upon positioning of the door means in the maximum heating position, is smaller than the pitch circle radius of a maximum cooling position side part of the toothed portion of the driving side gear, which is meshed with a maximum cooling position side part of the toothed portion of the driven side gear upon placement of the door means in the maximum cooling position; the pitch circle radius of the maximum heating position side part of the driven side gear is larger than the pitch circle radius of the maximum cooling position side part of the drive side gear; an outer peripheral part of the driving side gear has a spiral shape; the driven side gear has a fan shape; the driving side gear further includes: a circumferential end surface of the driven side gear, which extends in a radial direction of the driven side gear, contacts the stopper surface of the driving side gear in the maximum heating position of the door means.