Air conditioner for vehicle

1. An air conditioner for a vehicle comprising:

an air conditioning case that forms an air passage in which air flows toward an inside of a vehicle compartment;

a cooling heat exchanger that is arranged in the air passage and cools the air flowing in the air passage;

a heating heat exchanger that is arranged in the air passage on a downstream side of the cooling heat exchanger in an airflow direction and heats the air flowing in the air passage;

a first cool-air bypass path that is formed in a part adjacent to one end side of the heating heat exchanger, the first cool-air bypass path in which air flows while bypassing the heating heat exchanger;

a second cool-air bypass path that is formed in a part adjacent to an other end side of the heating heat exchanger, the second cool-air bypass path in which air flows while bypassing the heating heat exchanger;

a first air-mix door that is arranged in the air passage and adjusts an air volume ratio between a volume of air passing through the heating heat exchanger and a volume of air flowing in the first cool-air bypass path;

a second air-mix door that is arranged in the air passage and adjusts an air volume ratio between a volume of air passing through the heating heat exchanger and a volume of air flowing in the second cool-air bypass path;

a first shaft that (i) is connected to the first air-mix door inside of the air conditioning case, (ii) has a first exterior gear outside of the air conditioning case, and (iii) drives the first air-mix door in conjunction with being rotated;

a second shaft that (i) is arranged parallel to the first shaft, (ii) is connected to the second air-mix door inside of the air conditioning case, (iii) has a second exterior gear outside of the air conditioning case, and (iv) drives the second air-mix door in conjunction with being rotated; and

a rack that is arranged outside of the air conditioning case, is engaged with the first exterior gear and the second exterior gear, and interlocks the first shaft and the second shaft with each other, wherein

the air conditioning case has:

a protruding portion in which an end portion of the cooling heat exchanger is housed and supported; and

a recessed portion that is adjacent to the protruding portion and recessed toward an inner side of the air conditioning case to be located on an inner side of the protruding portion, and

at least a part of the rack is located in the recessed portion.

2. The air conditioner for a vehicle according to claim 1 , wherein

the first air-mix door and the second air-mix door are configured by a slide door that has a plate shape and slides parallel with an air inlet surface of the heating heat exchanger.

3. The air conditioner for a vehicle according to claim 1 , wherein

the first air-mix door and the second air-mix door are arranged between the cooling heat exchanger and the heating heat exchanger,

the first shaft and the second shaft are arranged between the cooling heat exchanger and the heating heat exchanger to be parallel with an air outlet surface of the cooling heat exchanger and an air inlet surface of the heating heat exchanger,

the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger are arranged non-parallel with each other when viewed in an axial direction of the first shaft and the second shaft,

one exterior gear of the first exterior gear and the second exterior gear is (i) located in a narrower area of a void between the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger and (ii) engaged with the rack on a side adjacent to the heating heat exchanger, and

an other exterior gear of the first exterior gear and the second exterior gear is (i) located in a broader area of the void between the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger and (ii) engaged with the rack on a side adjacent to the cooling heat exchanger.

4. The air conditioner for a vehicle according to claim 1 , further comprising

a temperature sensor that is arranged adjacent to an air outlet surface of the cooling heat exchanger and detects a temperature of air after passing through the cooling heat exchanger, wherein

the first air-mix door and the second air-mix door are arranged between the cooling heat exchanger and the heating heat exchanger,

the first shaft and the second shaft are arranged between the cooling heat exchanger and the heating heat exchanger to be parallel with an air outlet surface of the cooling heat exchanger and an air inlet surface of the heating heat exchanger,

one exterior gear of the first exterior gear and the second exterior gear is located closer to the temperature sensor and engaged with the rack on a side adjacent to the heating heat exchanger, and

an other exterior gear of the first exterior gear and the second exterior gear is located away from the temperature sensor and engaged with the rack on a side adjacent to the cooling heat exchanger.

5. The air conditioner for a vehicle according to claim 1 , wherein

an air outlet surface of the cooling heat exchanger and an air inlet surface of the heating heat exchanger are arranged non-parallel with each other when viewed in an axial direction of the first shaft and the second shaft,

a distance between the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger on a side adjacent to the first cool-air bypass path is longer than a distance between the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger on a side adjacent to the second cool-air bypass path,

the first air-mix door is arranged on a downstream side of the heating heat exchanger in the airflow direction,

the second air-mix door is arranged between the heating heat exchanger and the cooling heat exchanger,

the first shaft is arranged on the downstream side of the cooling heat exchanger in the airflow direction to be parallel with the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger,

the second shaft is arranged between the heating heat exchanger and the cooling heat exchanger to be parallel with the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger,

the rack is engaged with a downstream portion of the first exterior gear and engaged with a downstream portion of the second exterior gear.

6. The air conditioner for a vehicle according to claim 1 , wherein

the first air-mix door and the second air-mix door are arranged on a downstream side of the heating heat exchanger,

the first shaft and the second shaft are arranged on the downstream side of the heating heat exchanger to be parallel with an air outlet surface of the cooling heat exchanger and an air inlet surface of the heating heat exchanger,

the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger are arranged non-parallel with each other when viewed in an axial direction of the first shaft and the second shaft,

one exterior gear of the first exterior gear and the second exterior gear is (i) located in a narrower area of a void between the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger and (ii) engaged with the rack on a side opposite to the heating heat exchanger, and

an other exterior gear of the first exterior gear and the second exterior gear is (i) located in a broader area of the void between the air outlet surface of the cooling heat exchanger and the air inlet surface of the heating heat exchanger and (ii) engaged with the rack on a side adjacent to the heating heat exchanger.