Importance

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Abstract

A heater unit of automotive air conditioning device comprises a case. In the case, there are defined a cool air passage, a hot air passage and an air mix chamber. The cool air passage has an upstream end merged with an air inlet opening of the case and a downstream end merged with the air mix chamber. The hot air passage has an upstream end merged with the upstream end of the cool air passage and a downstream largest area merged with the air mix chamber. The air mix chamber is directly communicated with air outlet openings of the case. A heater core is arranged in the upstream end of the hot air passage. An air mix door is pivotally arranged in the case to vary the flow rate between air directed toward the hot air passage and air directed toward the cool air passage. A shutter door is pivotally arranged in the downstream largest area of the hot air passage. A link mechanism is used for achieving synchronized pivoting movements of the air mix door and the shutter door. The link mechanism has at least first and second conditions. In the first condition, the air mix door assumes a full cool position and the shutter door fully closes the hot air passage, while in the second condition, the air mix door assumes a half-open position other than the full cool and full hot positions and the shutter door fully opens the hot air passage.

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First Claim