WO2016158250A1 - Vehicular air-conditioning unit - Google Patents

Abstract

An air-conditioning case of this vehicular air-conditioning unit forms a first air passage (122), and a second air passage (123) that bypasses the first air passage and makes air flow toward the vehicle interior. A heat exchanger for heating is arranged in the first air passage, and heats air that has flowed in from an air inflow surface (181a) and causes said air to flow out from an air outflow surface (181b). A slide door is arranged within the air-conditioning case on the downstream side of the airflow with respect to the heat exchanger for heating in a reference airflow direction (FLhc), which is from the air inflow surface to the air outflow surface, the slide door opening and closing the first air passage by sliding and moving along a door open/close direction (DRoc) that intersects with the reference airflow direction. A door guide part is arranged within the air-conditioning case on the downstream side of the airflow with respect to the heat exchanger for heating in the reference airflow direction, the door guide part guiding the slide door in the door open/close direction. Further, the door guide part guides the slide door in the door open/close direction on the downstream side of the airflow with respect to the door guide part in the reference airflow direction.

Description

Air conditioning unit for vehicles Cross-reference to related applications

This application is based on Japanese Patent Application No. 2015-76155 filed on April 2, 2015, the contents of which are incorporated herein by reference.

This disclosure relates to a vehicle air-conditioning unit that blows air-conditioned air into a passenger compartment.

Conventionally, as this type of vehicle air conditioning unit, for example, there is one described in Patent Document 1. The vehicle air conditioning unit described in Patent Document 1 adjusts the temperature of the conditioned air blown from the vehicle air conditioning unit by a slide door. Specifically, the vehicle air conditioning unit of Patent Document 1 includes a hot air passage, an air conditioning case that forms a cold air passage provided in parallel with the hot air passage, a heating heat exchanger, and a cooling heat exchange. And an air mix door. The heating heat exchanger is disposed in the hot air passage and heats the air. The cooling heat exchanger is disposed on the upstream side of the air flow with respect to the hot air passage and the cold air passage, and cools the air.

Also, the air mix door adjusts the amount of air flowing through the hot air passage and the amount of air flowing through the cold air passage. The air mix door is a slide door that is slid in the door opening / closing direction by a slide mechanism, and is arranged on the upstream side of the air flow with respect to the heat exchanger for heating.

JP-A-11-105535

In the vehicle air conditioning unit of Patent Document 1, the air mix door is a sliding door as described above. Patent Document 1 does not clearly describe the mechanical structure for guiding the sliding door in the door opening / closing direction, but the door guide portion for guiding the sliding door in the door opening / closing direction has at least a sliding door and a heating purpose. It is necessary between the heat exchanger.

If the door guide portion is provided between the slide door and the heat exchanger for heating as described above, the door guide portion slides the slide door on the slide door side of the door guide portion.

That is, since the slide door is disposed on the upstream side of the air flow with respect to the heat exchanger for heating, the door guide portion is also disposed on the upstream side of the air flow with respect to the door guide portion. Slide on the upstream side of the air flow. Therefore, the door guide side for guiding the slide door in the door guide portion, specifically, the door sliding side on which the slide door slides in the door guide portion is the air flow upstream side. For example, if the part of the door guide portion on which the sliding door slides is a sliding surface, the sliding surface faces the upstream side of the air flow and faces the air flow in the air conditioning case.

Here, the vehicle air conditioning unit of Patent Document 1 will be described with reference to FIG. FIG. 11 shows the sliding surface 901 of the door guide portion 90 and the inside of the air conditioning case in a configuration in which the slide door 92 is arranged on the upstream side of the air flow with respect to the heat exchanger for heating as in the vehicle air conditioning unit of Patent Document 1. It is the figure which showed typically the relationship with the air flow. In FIG. 11, the sliding surface 901 faces the upstream side of the air flow as described above, and the sliding door 92 slides on the sliding surface 901 and slides as indicated by arrows SL1 and SL2.

As shown in FIG. 11, in the vehicle air conditioning unit of Patent Document 1, the sliding surface 901 on which the sliding door 92 slides faces the air flow in the air conditioning case. For this reason, in the vehicle air conditioning unit of Patent Document 1, foreign matter 94 mixed in the air flow in the air conditioning case is likely to adhere to the sliding surface 901. As a result of detailed studies by the inventors, the above has been found.

In view of the above points, it is an object of the present disclosure to provide a vehicle air conditioning unit in which foreign matter mixed in an air flow in an air conditioning case is less likely to adhere to a door guide side that guides a sliding door in a door guide portion. .

In order to achieve the above object, according to one aspect of the present disclosure, a vehicle air conditioning unit includes:
A first air passage that allows air to flow toward the passenger compartment, and an air conditioning case that forms a second air passage that bypasses the first air passage and flows air toward the passenger compartment.
A heating heat exchanger disposed in the first air passage, having an air inflow surface and an air outflow surface, heating the air flowing in from the air inflow surface and outflowing from the air outflow surface;
In the air conditioning case, a door opening / closing direction that is arranged on the downstream side of the air flow with respect to the heating heat exchanger in the reference air flow direction that is the direction of the air flow from the air inflow surface to the air outflow surface and intersects the reference air flow direction A sliding door that opens and closes the first air passage by sliding to
In the air conditioning case, it is arranged on the downstream side of the air flow with respect to the heat exchanger for heating in the reference air flow direction, and includes a door guide portion that guides the sliding door in the door opening and closing direction,
The door guide unit guides the slide door in the door opening / closing direction on the downstream side of the air flow in the reference air flow direction with respect to the door guide unit.

According to the above-described disclosure, the door guide unit guides the slide door in the door opening / closing direction on the downstream side of the air flow in the reference air flow direction with respect to the door guide unit. Therefore, the door guide side which guides a slide door among door guide parts turns into an air flow downstream. Therefore, compared with the configuration in which the door guide side (for example, the door sliding side) of the door guide portion is on the upstream side of the air flow as in the vehicle air conditioning unit of Patent Document 1, the air flow in the air conditioning case is mixed. There is a merit that the foreign matter is not easily attached to a part of the door guide portion on the door guide side.

In order to explain the merits, for example, a diagram schematically showing one configuration of the above-described disclosure assuming that the portion of the door guide portion 90 on which the slide door 92 slides is the sliding surface 901 is shown in FIG. ing. In the above disclosure, as shown in FIG. 12, the sliding surface 901 faces the downstream side of the air flow, and the sliding door 92 slides on the sliding surface 901 and slides as indicated by arrows SL1 and SL2. . Accordingly, the foreign matter 94 mixed in the air flow in the air conditioning case adheres exclusively to the surface 902 formed on the opposite side of the sliding surface 901 and facing the upstream side of the air flow, while the foreign matter 94 is on the sliding surface. 901 hardly adheres. For confirmation, FIG. 12 illustrates one configuration to which the above disclosure is applied. And although FIG. 12 shows the example which a slide door slides on a door guide part, the above-mentioned disclosure is not limited to a slide door sliding on a door guide part.

It is a figure which shows the main structures of the vehicle air conditioning unit in 1st Embodiment, Comprising: It is sectional drawing which looked at the vehicle air conditioning unit from the vehicle width direction. FIG. 2 is a sectional view taken along line II-II in FIG. It is sectional drawing which extracted the air-conditioning case from FIG. 2, and displayed the air-conditioning case alone. It is the figure which showed the state at the time of the maximum cooling of the vehicle air conditioning unit in the comparative example compared with 1st Embodiment, Comprising: It is sectional drawing cut | disconnected by the same cross section as FIG. It is the figure which showed the state at the time of the maximum cooling of the vehicle air conditioning unit in 1st Embodiment, Comprising: It is sectional drawing cut | disconnected by the same cross section as FIG. FIG. 5 is a view showing a state of the vehicle air conditioning unit during temperature control in the comparative example of FIG. 4, and is a cross-sectional view cut along the same cross section as FIG. 1. It is the figure which showed the state at the time of temperature control of the vehicle air conditioner unit in 1st Embodiment, Comprising: It is sectional drawing cut | disconnected by the same cross section as FIG. It is the figure which showed the state at the time of the maximum heating of the vehicle air conditioning unit in 1st Embodiment, Comprising: It is sectional drawing cut | disconnected by the same cross section as FIG. It is sectional drawing which shows the main structures of the air conditioning unit for vehicles in 2nd Embodiment, Comprising: It is a figure equivalent to FIG. 1 of 1st Embodiment. It is sectional drawing which shows the main structures of the vehicle air conditioning unit in 3rd Embodiment, Comprising: It is a figure corresponded in FIG. 9 of 2nd Embodiment. In the configuration in which the sliding door is disposed on the upstream side of the air flow with respect to the heat exchanger for heating as in the vehicle air conditioning unit of Patent Document 1, the relationship between the sliding surface of the door guide portion and the air flow in the air conditioning case is as follows. It is the figure shown typically. FIG. 12 is a view corresponding to FIG. 11, and conversely to FIG. 11, in a configuration in which the slide door is arranged on the downstream side of the air flow with respect to the heat exchanger for heating, the sliding surface of the door guide portion and the air conditioning case It is the figure which showed typically the relationship with an air flow.

Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In the following embodiments, the same or equivalent parts are denoted by the same reference numerals in the drawings.

(First embodiment)
FIG. 1 is a diagram illustrating a main configuration of a vehicle air conditioning unit 10 in the present embodiment, and is a cross-sectional view of the vehicle air conditioning unit 10 viewed from the vehicle width direction. In FIG. 1 and FIG. 2 described later, arrows DR1, DR2, and DR3 on the top, bottom, front, back, left and right indicate directions in a vehicle mounted state in which the vehicle air conditioning unit 10 is mounted on the vehicle. That is, the arrow DR1 in FIG. 1 indicates the vehicle vertical direction DR1, the arrow DR2 indicates the vehicle longitudinal direction DR2, and the arrow DR3 in FIG. 2 indicates the vehicle width direction DR3 (in other words, the vehicle horizontal direction DR3). The vehicle vertical direction DR1, the vehicle longitudinal direction DR2, and the vehicle width direction DR3 are directions orthogonal to each other.

A vehicle air conditioning unit 10 shown in FIG. 1 constitutes a part of a vehicle air conditioner including a compressor, a condenser, and the like disposed in an engine room of the vehicle. The vehicle air conditioning unit 10 is disposed inside an instrument panel provided in the foremost part of the vehicle interior.

As shown in FIG. 1, the vehicle air conditioning unit 10 includes an air conditioning case 12, an evaporator 16, a heater core 18, an air mix door 20, a door guide unit 22, a door drive unit 24, a blower (not shown), and the like. . In the vehicle air conditioning unit 10 of the present embodiment, for example, a blower is disposed on the upstream side of the air flow with respect to the evaporator 16, and the blower blows air to the evaporator 16 as indicated by an arrow FLin.

The air conditioning case 12 is a resin member that forms the outer shell of the vehicle air conditioning unit 10, and has a substantially rectangular parallelepiped outer shape extending in the vehicle longitudinal direction DR2. In FIG. 1, a main part related to the present disclosure is extracted from the entire air conditioning case 12 and illustrated.

The air conditioning case 12 forms an upstream air passage 121, a hot air passage 122 as a first air passage, and a cold air passage 123 as a second air passage inside the air conditioning case 12. The upstream air passage 121, the hot air passage 122, and the cold air passage 123 are all air passages that allow air to flow into the vehicle interior.

The upstream air passage 121 is provided on the upstream side of the air flow with respect to the hot air passage 122 and the cold air passage 123. That is, the warm air passage 122 and the cold air passage 123 are connected in parallel to each other on the downstream side of the upstream air passage 121. Therefore, the cold air passage 123 causes the air from the upstream air passage 121 to flow around the hot air passage 122. In addition, outside air that is air outside the passenger compartment or inside air that is air inside the passenger compartment is introduced into the upstream air passage 121 by an air blower as indicated by an arrow FLin. In the present embodiment, the cold air passage 123 is disposed above the hot air passage 122.

The evaporator 16 constitutes a well-known refrigeration cycle apparatus that circulates refrigerant together with a compressor, a condenser, and an expansion valve (not shown). The evaporator 16 cools the air passing through the evaporator 16 by evaporation of the refrigerant.

Specifically, the evaporator 16 is disposed in the upstream air passage 121. That is, the evaporator 16 is a cooling heat exchanger that cools the air flowing through the upstream air passage 121, in other words, a cooler. Therefore, the evaporator 16 cools the outside air or the inside air flowing into the upstream air passage 121 as indicated by the arrow FLin, and then flows it to one or both of the hot air passage 122 and the cold air passage 123. For example, the evaporator 16 is disposed in the upstream air passage 121 so that all of the air flowing through the upstream air passage 121 passes through the evaporator 16.

The structure of the evaporator 16 is the same as a well-known evaporator generally used in a vehicle air conditioner. Specifically, the evaporator 16 is connected to a core portion 161 and both ends of the core portion 161. The first header tank unit 162 and the second header tank unit 163 are configured. The core portion 161 of the evaporator 16 includes a plurality of refrigerant tubes each having a flat cross-sectional shape that communicates with the header tank portions 162 and 163, and a plurality of corrugated fins that are provided between the refrigerant tubes and formed into a wave shape. It is composed of The core portion 161 has a structure in which refrigerant tubes and corrugated fins are alternately stacked in the vehicle width direction DR3 (see FIG. 2).

In the evaporator 16, heat exchange is performed between the low-temperature refrigerant flowing in the refrigerant tube and the air passing through the core portion 161, thereby cooling the air. Moreover, since the core part 161 is divided into a plurality of fine air passages by the refrigerant tube and the corrugated fin, in the core part 161, air flows exclusively in the thickness direction of the core part 161. In the present embodiment, the refrigerant tube of the evaporator 16 extends in the vehicle vertical direction DR1, and the thickness direction of the core portion 161 is the vehicle longitudinal direction DR2.

The heater core 18 is disposed in the hot air passage 122. That is, the heater core 18 is a heating heat exchanger that heats the air that flows out of the evaporator 16 and flows through the hot air passage 122 with engine cooling water that is hot water, in other words, a heater. For example, the heater core 18 is disposed in the hot air passage 122 so that all of the air flowing through the hot air passage 122 passes through the heater core 18.

The structure of the heater core 18 is the same as a known heat exchanger for heating generally used in a vehicle air conditioner. Specifically, the heater core 18 includes a core portion 181 and a first header tank portion 182 and a second header tank portion 183 connected to both ends of the core portion 181.

The core portion 181 of the heater core 18 is composed of a plurality of hot water tubes each having a flat cross-sectional shape communicating with the header tank portions 182 and 183, and a plurality of corrugated fins provided between the hot water tubes and formed in a wave shape. It is configured. The core portion 181 has a structure in which hot water tubes and corrugated fins are alternately stacked in the vehicle width direction DR3 (see FIG. 2). With such a structure, the air flowing into the core portion 181 passes through the core portion 181 while being heated.

If the outer shape of the core portion 181 of the heater core 18 is a rectangular parallelepiped shape as shown in FIG. 1, the surface on the upstream side of the air flow of the core portion 181 becomes an air inflow surface 181 a through which air flows, and the core portion 181 The surface on the downstream side of the air flow becomes an air outflow surface 181b through which air flows out. That is, the core portion 181 is configured between the air inflow surface 181a and the air outflow surface 181b.

With such a configuration, the heater core 18 exchanges heat between the high-temperature engine cooling water flowing in the hot water tube and the air flowing into the core portion 181 from the air inflow surface 181a, thereby heating the air, and the air outflow surface. It is made to flow out from 181b.

Moreover, since the core part 181 is divided into a plurality of fine air passages by the hot water tube and the corrugated fin, in the core part 181, the air flows exclusively in the thickness direction of the core part 181. In the present embodiment, the hot water tube of the heater core 18 extends in the vehicle up-down direction DR1, and the first header tank portion 182 is located above the second header tank portion 183. That is, the first header tank portion 182 is the upper end portion of the heater core 18, and the second header tank portion 183 is the lower end portion of the heater core 18.

The air conditioning case 12 includes a first tank support portion 124 that supports the first header tank portion 182 of the heater core 18 and a second tank support portion 125 that supports the second header tank portion 183 of the heater core 18. Have in. The heater core 18 has a first header tank part 182 fitted in a U-shaped groove formed by the first tank support part 124, and a second header tank part in the U-shaped groove formed by the second tank support part 125. When 183 is fitted, it is supported with respect to the air conditioning case 12.

The air mix door 20 is a slide door disposed in the air conditioning case 12. The air mix door 20 is disposed downstream of the heater core 18 in the flow direction of the air passing through the heater core 18. More specifically, the air mix door 20 is disposed on the downstream side of the air flow with respect to the heater core 18 in the reference air flow direction FLhc that is the air flow direction FLhc from the air inflow surface 181a to the air outflow surface 181b of the heater core 18. ing. The air mix door 20 opens and closes the air outflow surface 181b of the heater core 18 by sliding in the door opening / closing direction DRoc. In short, the warm air passage 122 is opened and closed.

The door opening / closing direction DRoc of the air mix door 20 is a direction intersecting the reference air flow direction FLhc, for example, a direction along the air outflow surface 181b of the heater core 18. The direction along the air outflow surface 181b includes not only a direction parallel to the air outflow surface 181b but also a substantially parallel direction in view of technical common sense. In the present embodiment, since the cold air passage 123 is arranged on the upper side with respect to the heater core 18, the door opening / closing direction DRoc is a direction along the vehicle vertical direction DR1.

Specifically, since the slide range of the air mix door 20 extends from the hot air passage 122 to the cold air passage 123, the air mix door 20 opens and closes the hot air passage 122 by sliding movement in the door opening / closing direction DRoc. The cold air passage 123 is also opened and closed. Therefore, the air mix door 20 adjusts the air volume ratio between the air flowing through the hot air passage 122 and the air flowing through the cold air passage 123 according to the slide position.

Specifically, the air mix door 20 has the maximum cooling air passage 122 fully opened and the cold air passage 123 fully closed from the maximum cooling position where the hot air passage 122 is fully closed and the cold air passage 123 is fully opened. It is moved continuously between the heating position. The maximum cooling position of the air mix door 20 is also called a max cool position. When the air mix door 20 reaches the maximum cooling position, the entire amount of air that has passed through the evaporator 16 flows to the cool air passage 123. In other words, the air mix door 20 is positioned at the maximum cooling position during maximum cooling when the vehicle air conditioning unit 10 is most powerfully cooled.

On the other hand, the maximum heating position of the air mix door 20 is also called a maximum hot position. When the air mix door 20 reaches the maximum heating position, the entire amount of air that has passed through the evaporator 16 flows to the hot air passage 122. In other words, the air mix door 20 is positioned at the maximum heating position during the maximum heating when the vehicle air conditioning unit 10 is heated most strongly.

The air mix door 20 may be positioned at an intermediate position between the maximum cooling position and the maximum heating position. In this case, the air that has passed through the evaporator 16 corresponds to the slide position of the air mix door 20. It flows to the hot air passage 122 and the cold air passage 123 respectively at the air volume ratio. An air mix space 126 is formed in the air conditioning case 12 through which the warm air heated by the heater core 18 through the warm air passage 122 and the cold air that has passed through the cool air passage 123 are merged. It is mixed in and blown out into the passenger compartment. Therefore, the temperature of the air flowing into the air conditioning case 12 as indicated by the arrow FLin is adjusted according to the slide position of the air mix door 20 and blown out into the passenger compartment.

In addition, the air mix door 20 has a rack 201 on the air flow downstream surface of the air mix door 20 in the reference air flow direction FLhc in order to receive the operating force from the door drive unit 24. That is, the rack 201 is arranged on the air flow downstream side of the air mix door 20 in the reference air flow direction FLhc. Further, two racks 201 of the air mix door 20 are provided as shown in FIG. 2 which is a cross-sectional view taken along the line II-II of FIG. Specifically, the two racks 201 are respectively arranged at the edges on both sides of the air mix door 20 in the vehicle width direction DR3 to form a pair. Each of the two racks 201 is formed to extend over the entire length of the air mix door 20 in the vehicle vertical direction DR1.

As shown in FIGS. 1 and 2, the door guide portion 22 is provided in the air conditioning case 12 so as to extend from the hot air passage 122 to the cold air passage 123, and guides the air mix door 20 in the door opening / closing direction DRoc. . The door guide portion 22 is disposed in the air flow case 12 on the downstream side of the air flow with respect to the heater core 18 in the reference air flow direction FLhc. More specifically, the air mix door 20 is disposed upstream of the air flow. In short, the door guide portion 22 is provided between the heater core 18 and the air mix door 20 in the reference air flow direction FLhc. Therefore, the door guide unit 22 guides the air mix door 20 in the door opening / closing direction DRoc by sliding the air mix door 20 on the downstream side of the air flow in the reference air flow direction FLhc.

Specifically, the door guide portion 22 includes ribs 221, 222, and 223 protruding inside the air conditioning case 12, a downstream portion 124a of the first tank support portion 124, and a downstream portion 125a of the second tank support portion 125. It consists of and. The downstream portion 124a of the first tank support portion 124 is a portion constituting the downstream side of the air flow in the reference air flow direction FLhc in the first tank support portion 124. The downstream portion 125a of the second tank support 125 is a portion of the second tank support 125 that constitutes the downstream side of the air flow in the reference air flow direction FLhc.

That is, the door guide portion 22 is configured to overlap the first tank support portion 124 and the second tank support portion 125 in a part thereof.

And the door guide part 22 forms the sliding surface 22a which faced the air flow downstream in the reference | standard air flow direction FLhc. More specifically, the sliding surface 22a includes first to fifth sliding surfaces 221a, 222a, 223a, 124b, and 125b, and forms, for example, a continuous flat surface.

The first sliding surface 221a of the sliding surface 22a of the door guide portion 22 is a surface formed by the first rib 221 of the door guide portion 22. 2 and 3, the first sliding surface 221a is disposed in one of the vehicle width directions DR3 in the air conditioning case 12, and extends from the hot air passage 122 to the cold air passage 123 in the vehicle vertical direction DR1. It is extended to. FIG. 3 is a cross-sectional view of the air conditioning case 12 extracted from FIG. 2 and displayed as a single unit.

2nd sliding surface 222a is a surface which the 2nd rib 222 of the door guide part 22 forms. The second sliding surface 222a is disposed in the air conditioning case 12 on the side opposite to the first sliding surface 221a side in the vehicle width direction DR3, and extends from the hot air passage 122 to the cold air passage 123 in the vehicle vertical direction DR1. It is extended to.

The third sliding surface 223 a is a surface formed by the third rib 223 of the door guide portion 22. The third sliding surface 223a is disposed in the air conditioning case 12 on the opposite side of the warm air passage 122 along the vehicle vertical direction DR1 with respect to the cold air passage 123, and extends in the vehicle width direction DR3. Yes. One end of the third sliding surface 223a in the vehicle width direction DR3 is connected to the first sliding surface 221a, and the other end of the third sliding surface 223a is connected to the second sliding surface 222a.

The fourth sliding surface 124b is a surface formed by the downstream portion 124a of the first tank support portion 124. The fourth sliding surface 124b is disposed at the boundary between the hot air passage 122 and the cold air passage 123 in the air conditioning case 12, and extends in the vehicle width direction DR3. One end of the fourth sliding surface 124b in the vehicle width direction DR3 is connected to the first sliding surface 221a, and the other end of the third sliding surface 223a is connected to the second sliding surface 222a.

The fifth sliding surface 125b is a surface formed by the downstream portion 125a of the second tank support 125. In the air conditioning case 12, the fifth sliding surface 125b is disposed on the opposite side of the cold air passage 123 along the vehicle vertical direction DR1 with respect to the hot air passage 122, and extends in the vehicle width direction DR3. Yes. One end of the fifth sliding surface 125b in the vehicle width direction DR3 is connected to the first sliding surface 221a, and the other end of the fifth sliding surface 125b is connected to the second sliding surface 222a.

The air mix door 20 slides on the sliding surface 22a configured as described above, and thereby slides in the door opening / closing direction DRoc. For example, when the air mix door 20 is positioned at the maximum cooling position, the peripheral portion of the air mix door 20 includes a fourth sliding surface 124b, a fifth sliding surface 125b, a first sliding surface 221a, and The second sliding surface 222a comes into contact with a sliding surface formed of a portion provided between the fourth sliding surface 124b and the fifth sliding surface 125b. As a result, the air mix door 20 opens the cold air passage 123 and blocks the air flow through the hot air passage 122.

On the other hand, when the air mix door 20 is positioned at the maximum heating position, the peripheral portion of the air mix door 20 includes the third sliding surface 223a, the fourth sliding surface 124b, and the first sliding surface. It contacts with the sliding surface which consists of the part provided between the 3rd sliding surface 223a and the 4th sliding surface 124b among 221a and the 2nd sliding surface 222a. As a result, the air mix door 20 opens the hot air passage 122 and blocks the air flow through the cold air passage 123.

As shown in FIGS. 1 and 2, the door drive unit 24 is a door operating mechanism that slides the air mix door 20. The door drive unit 24 includes a rotating shaft 241 and a pair of gears 242. The door driving unit 24 is disposed in the air conditioning case 12. That is, the rotating shaft 241 and the gear 242 are also arranged in the air conditioning case 12.

The rotation shaft 241 of the door drive unit 24 is a cylindrical member that rotates around the door drive unit axis CLdr, which is a single axis along the vehicle width direction DR3. The rotating shaft 241 is connected to, for example, a motor (not shown) attached to the outer wall surface of the air conditioning case 12, and is rotated by the motor.

The pair of gears 242 of the door drive unit 24 are respectively fixed to the rotation shaft 241 and rotate around the door drive unit axis CLdr together with the rotation shaft 241. The pair of gears 242 mesh with a pair of racks 201 provided on the air mix door 20.

In the positional relationship between the door drive unit 24 and the air mix door 20, both the rotation shaft 241 and the gear 242 of the door drive unit 24 are arranged downstream of the air flow in the reference air flow direction FLhc with respect to the air mix door 20. Has been.

Further, the door drive unit 24 is disposed at the center of the entire stroke of the air mix door 20 in the door opening / closing direction DRoc. Therefore, the door drive unit 24 is provided closer to the first tank support unit 124 than the second tank support unit 125. A part of the door driving unit 24, more specifically, most of the door driving unit 24, has a reference air flow with respect to the entire tank unit 26 including the first tank support unit 124 and the first header tank unit 182 of the heater core 18. It is provided so as to overlap the downstream side of the air flow in the flow direction FLhc. In the present embodiment, the first header tank part 182 corresponds to the tank part of the heat exchanger for heating, and the first tank support part 124 corresponds to the tank support part of the air conditioning case.

The arrangement of the door drive unit 24 will be further described. As shown in FIG. 1, the rotation shaft 241 of the door drive unit 24 is arranged on the downstream side of the air flow in the reference air flow direction FLhc with respect to the entire tank unit 26. When viewed from the direction along the door drive unit axis CLdr, for example, when viewed in the cross section shown in FIG. 1, the entire rotation shaft 241 overlaps the entire tank portion 26 in the reference air flow direction FLhc. Is provided. This is clear when the width WDtk of the entire tank portion 26 in the vehicle vertical direction DR1 is compared with the diameter of the rotating shaft 241.

Further, the air mix door 20 is disposed so as to be sandwiched between the sliding surface 22a of the door guide portion 22 and the gear 242 of the door drive portion 24 in the reference air flow direction FLhc. Restrained in the flow direction FLhc.

The air conditioning case 12 has a hot air passage downstream side wall 127 that bends the hot air passage 122 to the cold air passage 123 side, that is, the upper side, on the downstream side of the air flow with respect to the heater core 18. Therefore, the hot air passage 122 extends to the downstream end 127a of the hot air passage downstream side wall 127, and the downstream end of the hot air passage 122 is represented by a two-dot chain line L1ed in FIG. Therefore, the rotating shaft 241 of the door driving unit 24 is disposed in the hot air passage 122. Note that, in FIG. 1, for example, in FIG. 1, all of the rotary shaft 241 may be disposed in the hot air passage 122, or the rotary shaft 241 may have a rotational axis 241 perpendicular to the door drive unit axis CLdr. A part may be only disposed in the hot air passage 122.

The air conditioning case 12 is formed with a plurality of air outlets 128, 129, and 130 for blowing out temperature-controlled conditioned air. The plurality of air outlets 128, 129, and 130 are all connected to the air mix space 126, and the conditioned air that has passed through the air mix space 126 passes through one of the plurality of air outlets 128, 129, and 130. And blown out into the passenger compartment.

Specifically, the plurality of air outlets 128, 129, and 130 are a face outlet 128, a foot outlet 129, and a defroster outlet 130. The face air outlet 128 is an air outlet that blows conditioned air toward the upper body of the passenger in the vehicle interior. Moreover, the foot blower outlet 129 is a blower outlet which blows off air-conditioning wind toward a passenger | crew's step. Moreover, the defroster blower outlet 130 is a blower outlet which blows off air-conditioning wind toward the inner surface of a vehicle front window glass.

Each of the plurality of air outlets 128, 129, and 130 is provided with an opening / closing door (not shown), and the opening degree of the air outlets 128, 129, and 130 is changed by opening / closing the opening / closing door. The Thereby, a plurality of blowing modes are alternatively realized in the vehicle air conditioning unit 10.

For example, as the blowing mode, there are a face mode, a foot mode, a defroster mode, a bi-level mode, a foot defroster mode, and the like. In the face mode, the face air outlet 128 is opened and the foot air outlet 129 and the defroster air outlet 130 are closed. In the foot mode, the foot outlet 129 is opened and the face outlet 128 and the defroster outlet 130 are closed. In the defroster mode, the defroster outlet 130 is opened and the face outlet 128 and the foot outlet 129 are closed. In the bi-level mode, both the face outlet 128 and the foot outlet 129 are opened and the defroster outlet 130 is closed. In the foot defroster mode, both the foot outlet 129 and the defroster outlet 130 are opened and the face outlet 128 is closed.

As described above, according to the present embodiment, as shown in FIG. 1, the door guide portion 22 slides the air mix door 20 on the downstream side of the air flow in the reference air flow direction FLhc with respect to the door guide portion 22. By moving, it guides in the door opening / closing direction DRoc. Therefore, the door sliding side on which the air mix door 20 slides, that is, the side on which the sliding surface 22a is formed, is the downstream side of the air flow. Therefore, compared with the configuration in which the door sliding side is the air flow upstream side as in the vehicle air conditioning unit of Patent Document 1, the air flow in the air conditioning case 12 is mixed as described above with reference to FIG. There is an advantage that foreign matter is less likely to adhere to the sliding surface 22a on the door sliding side of the door guide portion 22.

Further, according to the present embodiment, as shown in FIG. 1, the door guide portion 22 is provided in the air conditioning case 12 so as to extend from the hot air passage 122 to the cold air passage 123. Therefore, the air mix door 20 can be guided so that the air mix door 20 slides from the maximum cooling position to the maximum heating position. Since the sliding surface of the air mix door 20 that slides in contact with the door guide portion 22 is covered with the door guide portion 22 widely in the stroke of the air mix door 20, the sliding of the air mix door 20 correspondingly. Foreign matter is hard to adhere to the surface.

Further, according to the present embodiment, the first sliding surface 221a and the second sliding surface 222a are provided in the air conditioning case 12 extending from the hot air passage 122 to the cold air passage 123 in the door opening / closing direction DRoc, as shown in FIG. It extends so as to cover the entire width. Therefore, the sliding surface of the air mix door 20 that slides facing the first sliding surface 221a and the second sliding surface 222a is any position of the stroke from the maximum cooling position to the maximum heating position. Even if it exists, it will be covered with the 1st sliding surface 221a and the 2nd sliding surface 222a. Therefore, it is difficult for foreign matter to adhere to the sliding surface of the air mix door 20.

In addition, according to the present embodiment, most of the door driving unit 24 is in the reference air flow direction FLhc with respect to the entire tank portion 26 including the first tank support portion 124 and the first header tank portion 182 of the heater core 18. It is provided so as to overlap the downstream side of the air flow. Therefore, the air flow in the cold air passage 123 is not easily obstructed by the door driving unit 24. This will be described with reference to FIGS.

For example, in contrast to the present embodiment, a comparative example is assumed in which the door driving unit 24 is provided on the upstream side of the air flow in the reference air flow direction FLhc with respect to the entire tank unit 26. In the comparative example, when the air mix door 20 is at the maximum cooling position, the result is as shown in FIG. That is, in the comparative example shown in FIG. 4, the cold air flowing out from the evaporator 16 flows as shown by the arrow FLmc.

And since the rotating shaft 241 of the door drive part 24 exists in the distribution path | route of the cold wind shown by the arrow FLmc, the air volume of the cold wind will fall. Further, in the comparative example shown in FIG. 4, the door drive unit 24 and the rack 201 are directly exposed to the air blown from the evaporator 16, so that the gear 242 of the door drive unit 24 and the rack 201 of the air mix door 20 are exposed. Foreign matter is likely to adhere.

On the other hand, when the air mix door 20 is in the maximum cooling position in the present embodiment, it is as shown in FIG. That is, in the present embodiment, when the air mix door 20 is at the maximum cooling position as shown in FIG. 5, the cool air flowing out from the evaporator 16 flows as indicated by the arrow FLmc.

And since the door drive part 24 becomes the arrangement | positioning which cannot hinder the flow of the cold wind shown by the arrow FLmc, it is possible to suppress the air volume fall of the cold wind resulting from the door drive part 24 being provided. is there. Further, in the present embodiment, the door drive unit 24 and the rack 201 are hidden behind the entire tank portion 26 against the air blown from the evaporator 16, so that the gear 242 of the door drive unit 24 and the rack 201 of the air mix door 20 are hidden. Foreign matter is difficult to adhere. Note that the blowing modes in FIGS. 4 and 5 are both face modes.

Further, according to the present embodiment, as shown in FIG. 1, the rotating shaft 241 and the gear 242 of the door driving unit 24 are arranged on the downstream side of the air flow in the reference air flow direction FLhc with respect to the air mix door 20. . The rack 201 of the air mix door 20 is disposed on the air flow downstream side of the air mix door 20 in the reference air flow direction FLhc. Accordingly, the rotating shaft 241, the gear 242, and the rack 201 are arranged so as to be hidden behind the air mix door 20 with respect to the evaporator 16, so that the foreign matter contained in the air blown from the evaporator 16 has its rotating shaft 241, It is difficult to adhere to the gear 242 and the rack 201.

Further, according to the present embodiment, as shown in FIG. 1, the rotation shaft 241 of the door drive unit 24 is disposed on the downstream side of the air flow in the reference air flow direction FLhc with respect to the entire tank unit 26. When viewed from the direction along the door drive unit axis CLdr, all of the rotation shaft 241 is provided so as to overlap the entire tank portion 26 in the reference air flow direction FLhc. Therefore, at the time of maximum cooling of the air conditioning unit 10 for the vehicle, as shown in FIG. 5, the rotating shaft 241 hardly disturbs the flow of the cold air, and it is possible to suppress a decrease in the air volume due to the arrangement of the rotating shaft 241.

Further, according to the present embodiment, the rotating shaft 241 of the door driving unit 24 is disposed in the warm air passage 122. More specifically, the rotating shaft 241 is disposed on the downstream side of the air flow with respect to the heater core 18 in the air flow in the air conditioning case 12. Therefore, during the temperature control in which the air mix door 20 is positioned at an intermediate position between the maximum cooling position and the maximum heating position, the warm air flowing through the warm air passage 122 is agitated by passing around the rotation shaft 241. This will be described with reference to FIGS.

For example, it is assumed that the air mix door 20 is positioned at an intermediate position in the comparative example described with reference to FIG. FIG. 6 shows a state at the time of temperature control of the vehicle air conditioning unit 10 in the comparative example of FIG. 4, that is, a state where the air mix door 20 is positioned at the intermediate position. As shown in FIG. 6, at the time of temperature control in the comparative example, the cool air flowing out of the evaporator 16 flows through the cool air passage 123 as indicated by the arrow FL2mx, and at the same time, the hot air passage 122 as indicated by the arrow FL1mx. Flowing. Then, the cold air flowing into the hot air passage 122 is heated by the heater core 18 to become hot air, and merges and mixes with the cold air from the cold air passage 123 in the air mix space 126.

At this time, as can be seen from the positional relationship of the rotary shaft 241 of the door drive unit 24 with respect to the arrows FL1mx and FL2mx in FIG. 6, the rotary shaft 241 has its airflow indicated by the arrows FL1mx and FL2mx. The effect of stirring the air flow is not so great. Accordingly, the hot air indicated by the arrow FL1mx and the cold air indicated by the arrow FL2mx are mixed in the air mix space 126, but the temperature mixing property of the conditioned air in the air mix space 126 is not good, that is, the temperature unevenness is large. Can occur. And if the temperature unevenness is large in the conditioned air blown out from the air mix space 126 into the vehicle interior as indicated by the arrows FLfc and FLft, the comfort of the passenger may be impaired.

On the other hand, when the temperature of the vehicle air conditioning unit 10 in the present embodiment is controlled, it is as shown in FIG. That is, in this embodiment, when the air mix door 20 is in the intermediate position as shown in FIG. 7, the cold air flowing out from the evaporator 16 is the hot air passage 122 and the cold air passage 123 as indicated by arrows FL1mx and FL2mx. Each flowing. Then, the cold air flowing into the warm air passage 122 is heated by the heater core 18 to become warm air, and merges and mixes with the cold air from the cold air passage 123 in the air mix space 126.

At this time, in this embodiment, unlike the comparative example described above, a part of the air flowing through the hot air passage 122 and flowing out of the heater core 18 as shown by the arrow FL1mx collides with the rotating shaft 241 and is stirred as shown by the arrow FL1sw. For example, vortex or turbulence is generated. Accordingly, the hot air indicated by the arrow FL1mx and the cold air indicated by the arrow FL2mx are mixed well in the air mix space 126. As a result, the temperature mixing property of the conditioned air blown out from the air mix space 126 into the vehicle interior as indicated by arrows FLfc and FLft can be improved as compared with, for example, the above comparative example. In other words, it is possible to homogenize the conditioned air and reduce temperature unevenness. Note that the blowing modes in FIGS. 6 and 7 are both bi-level modes.

In addition, in this embodiment, as demonstrated using said FIG. 7, the effect of improving the temperature mixing property of air-conditioning air at the time of temperature control is acquired. On the other hand, at the time of maximum heating, as shown in FIG. 8, the air blown from the evaporator 16 flows through the warm air passage 122 as indicated by an arrow FLmh. That is, since the rotating shaft 241 of the door drive unit 24 is disposed in the hot air passage 122, it can be a cause of disturbing the air flow indicated by the arrow FLmh. However, since it is not necessary to increase the amount of air blown into the passenger compartment during maximum heating compared to during maximum cooling, this is not a big problem. FIG. 8 is a cross-sectional view showing a state of maximum heating of the vehicle air conditioning unit 10 in the present embodiment, and the blowing mode in FIG. 8 is a foot mode.

(Second Embodiment)
Next, a second embodiment will be described. In the present embodiment, differences from the first embodiment will be mainly described. Further, the same or equivalent parts as those of the above-described embodiment will be described by omitting or simplifying them. The same applies to a third embodiment described later.

FIG. 9 is a cross-sectional view showing the main configuration of the vehicle air conditioning unit 10 in the present embodiment, and corresponds to FIG. 1 of the first embodiment. As shown in FIG. 9, the vehicle air conditioning unit 10 according to the present embodiment includes two air passage groups including a hot air passage 122 and a cold air passage 123 provided in parallel on the downstream side of the upstream air passage 121. Yes. This is different from the first embodiment.

Specifically, in the present embodiment, the air conditioning case 12 includes first and second passage separation walls 131 and 132 that extend along the air flow on the downstream side of the air flow with respect to the evaporator 16. An upper air passage group 133 including one hot air passage 122 and one cold air passage 123 is formed on the upper side of the passage separation walls 131 and 132, and below the passage separation walls 131 and 132. Is formed with a lower air passage group 134 composed of one hot air passage 122 and one cold air passage 123. The upper air passage group 133 and the lower air passage group 134 are provided in parallel with the passage separation walls 131 and 132 therebetween.

In the upper air passage group 133, the hot air passage 122 is provided below the cold air passage 123. Conversely, in the lower air passage group 134, the hot air passage 122 is connected to the cold air passage 123. On the other hand, it is provided on the upper side. That is, the hot air passage 122 of the upper air passage group 133 and the hot air passage 122 of the lower air passage group 134 are adjacent to each other via the passage separation walls 131 and 132. The heater core 18 is disposed across the passage separation walls 131 and 132 so as to straddle the hot air passage 122 of the upper air passage group 133 and the hot air passage 122 of the lower air passage group 134. Accordingly, the first passage separation wall 131 is disposed on the upstream side of the air flow with respect to the heater core 18, and the second passage separation wall 132 is disposed on the downstream side of the air flow with respect to the heater core 18.

FIG. 9 shows the vehicle air conditioning unit 10 in the case of maximum cooling and the blowout mode is the face mode, and the arrow FLmc shows the air flow in the air conditioning case 12 at that time.

In this embodiment, it is possible to obtain the same effects as those of the first embodiment, which are obtained from the configuration common to the first embodiment. For example, the effect that the rotating shaft 241 of the door driving unit 24 hardly obstructs the flow of cold air at the maximum cooling, and the effect that foreign matter hardly adheres to the sliding surface 22a, the rotating shaft 241, the gear 242, and the rack 201. It can obtain similarly to 1st Embodiment.

(Third embodiment)
Next, a third embodiment will be described. In the present embodiment, differences from the second embodiment will be mainly described.

FIG. 10 is a cross-sectional view showing the main configuration of the vehicle air conditioning unit 10 in the present embodiment, and corresponds to FIG. 9 of the second embodiment. As shown in FIG. 10, in the vehicle air conditioning unit 10 of the present embodiment, the air flow in the air conditioning case 12 is generally along the vehicle longitudinal direction DR2, and the evaporator 16 and the heater core 18 are arranged in parallel to each other. ing. The door opening / closing direction DRoc of the air mix door 20 is oriented along the air outflow surface 181b of the heater core 18. These points are the same as in the second embodiment.

However, in the vehicle air conditioning unit 10 of the present embodiment, the evaporator 16 and the heater core 18 are arranged to be inclined with respect to the vehicle vertical direction DR1. This is different from the second embodiment. Therefore, in the present embodiment, the reference air flow direction FLhc is inclined with respect to the vehicle vertical direction DR1 and the vehicle front-rear direction DR2, and the door opening / closing direction DRoc of the air mix door 20 is also relative to the vehicle vertical direction DR1 and the vehicle front-rear direction DR2. Tilted.

In addition, in FIG. 10, since each air outlet 128,129,130 is the same as that of FIG. 9, the illustration is abbreviate | omitted. FIG. 10 shows the vehicle air conditioning unit 10 during maximum cooling, and the arrow FLmc indicates the air flow in the air conditioning case 12 at that time.

In this embodiment, it is possible to obtain the same effect as that of the second embodiment, which is obtained from the configuration common to the second embodiment.

(Other embodiments)
(1) In the first embodiment described above, a part of the door drive unit 24 is provided so as to overlap the entire tank unit 26 on the downstream side of the air flow in the reference air flow direction FLhc. However, this is only an example, and not all of the door drive unit 24 but a part of the door drive unit 24 may be provided on the downstream side of the air flow in the reference air flow direction FLhc. That is, it is only necessary that at least a part of the door driving unit 24 is provided on the downstream side of the air flow in the reference air flow direction FLhc with respect to the entire tank unit 26.

(2) In each of the above-described embodiments, for example, as shown in FIG. 1, when viewed from the direction along the door drive unit axis CLdr, the entire rotation shaft 241 is in the reference air flow direction with respect to the entire tank unit 26. It is provided so as to overlap FLhc, which is preferable. However, this is an example, and a part of the rotating shaft 241 may be provided so as to overlap the entire tank portion 26 in the reference air flow direction FLhc. That is, it is only necessary that at least a part of the rotating shaft 241 is provided so as to overlap the entire tank portion 26 in the reference air flow direction FLhc.

(3) In each of the above-described embodiments, the door guide portion 22 contacts the air mix door 20 on the sliding surface 22a of the door guide portion 22. Therefore, contact between the door guide portion 22 and the air mix door 20 is surface contact. However, it need not be limited to surface contact. For example, the door guide portion 22 has a guide rib that protrudes toward the air mix door 20 of the door guide portion 22 and extends in the door opening / closing direction DRoc, and the air mix door 20 is in contact with the tip of the guide rib while being in line contact. Even if it slides with respect to the guide part 22, it does not interfere.

(4) In each of the embodiments described above, the door guide portion 22 is disposed in the air conditioning case 12 on the downstream side of the air flow with respect to the heater core 18 in the reference air flow direction FLhc. In this regard, it is not necessary that the entire door guide portion 22 is disposed on the downstream side of the air flow with respect to the heater core 18. For example, a portion of the entire door guide 22 that overlaps the hot air passage 122 may be on the downstream side of the air flow with respect to the heater core 18, and a portion that overlaps the cold air passage 123 may not be on the downstream side of the air flow with respect to the heater core 18.

(5) In each of the above-described embodiments, the air mix door 20 moves in the door opening / closing direction DRoc by sliding a sliding portion of the air mix door 20 with respect to the sliding surface 22a of the door guide portion 22. Guided. In this regard, a sliding surface on the opposite side facing the sliding surface 22a across the sliding portion of the air mix door 20 may be provided. In such a case, the air mixing door 20 is guided in the door opening / closing direction DRoc by the sliding surface 22a and the sliding surface on the opposite side, but the role of guiding the air mixing door 20 is mainly sliding. It becomes the surface 22a. Accordingly, since the area of the sliding surface on the opposite side can be remarkably reduced compared to the sliding surface 22a, the adhesion of foreign matter to the sliding surface on the opposite side does not become a big problem.

(6) In each of the above-described embodiments, the vehicle air conditioning unit 10 includes the evaporator 16. However, the vehicle air conditioning unit 10 is used in an environment where it is not necessary to cool the air introduced into the air conditioning case 12, for example. If it is possible, the evaporator 16 may be omitted.

(7) In each of the embodiments described above, the sliding surface 22a of the door guide portion 22 forms a continuous flat surface, but may be a curved surface.

(8) In FIG. 1 of the first embodiment described above, the door opening / closing direction DRoc of the air mix door 20 is described parallel to the air outflow surface 181b of the heater core 18, but the door opening / closing direction DRoc is the air outflow surface. The direction may be inclined with respect to 181b. The same applies to the second and third embodiments.

Note that the present disclosure is not limited to the above-described embodiment. The present disclosure includes various modifications and modifications within the equivalent range. In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes. Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case. In each of the above embodiments, when referring to the material, shape, positional relationship, etc. of the constituent elements, etc., unless otherwise specified, or in principle limited to a specific material, shape, positional relationship, etc. The material, shape, positional relationship, etc. are not limited.

Claims (13)

1. An air conditioning unit for a vehicle,
   A first air passage (122) for flowing air toward the passenger compartment and an air conditioning case (12) that forms a second air passage (123) that bypasses the first air passage and flows air toward the passenger compartment. )When,
   Heat exchange for heating, which is disposed in the first air passage, has an air inflow surface (181a) and an air outflow surface (181b), and heats air flowing in from the air inflow surface to flow out of the air outflow surface. A vessel (18),
   In the air conditioning case, a reference air flow direction (FLhc) that is a direction of air flow from the air inflow surface to the air outflow surface is disposed on the downstream side of the air flow with respect to the heat exchanger for heating, and the reference air A sliding door (20) that opens and closes the first air passage by sliding in a door opening / closing direction (DRoc) intersecting the flow direction;
   A door guide portion (22) disposed downstream of the heating heat exchanger in the reference air flow direction in the air conditioning case and guiding the slide door in the door opening and closing direction;
   The said door guide part is a vehicle air-conditioning unit which guides the said slide door to the said door opening / closing direction in the air flow downstream in the said reference air flow direction with respect to the said door guide part.
2. The vehicle door according to claim 1, wherein the door guide portion forms a sliding surface (22a) facing the downstream side of the air flow in the reference air flow direction, and the sliding door slides on the sliding surface. Air conditioning unit.
3. The vehicle air conditioning unit according to claim 1 or 2, wherein the door guide portion is provided so as to extend from the first air passage to the second air passage in the air conditioning case.
4. A door drive unit (24) disposed in the air conditioning case and slidably moving the slide door;
   The heating heat exchanger includes a core portion (181) configured between the air inflow surface and the air outflow surface, through which air passes while being heated, and a tank portion (182) connected to the core portion. Have
   The air conditioning case has a tank support part (124) for supporting the tank part in the air conditioning case,
   The at least part of the door driving part is provided so as to overlap the downstream side of the air flow in the reference air flow direction with respect to the entire tank part (26) composed of the tank part and the tank support part. The vehicle air conditioning unit according to any one of 3 above.
5. The door driving unit includes a rotating shaft (241) that rotates about a single axis (CLdr), and a gear (242) that is fixed to the rotating shaft and rotates about the single axis,
   The vehicle air conditioning unit according to claim 4, wherein the sliding door includes a rack (201) that meshes with the gear.
6. The rotation shaft and the gear of the door drive unit are arranged on the downstream side of the air flow in the reference air flow direction with respect to the slide door,
   The vehicle air conditioning unit according to claim 5, wherein the rack is arranged on the downstream side of the air flow in the reference air flow direction in the slide door.
7. The rotating shaft is disposed on the downstream side of the air flow in the reference air flow direction with respect to the entire tank portion,
   7. The vehicle according to claim 5, wherein at least a part of the rotating shaft is provided so as to overlap the entire tank portion in the reference air flow direction when viewed from the direction along the one axis. Air conditioning unit.
8. The rotating shaft is disposed on the downstream side of the air flow in the reference air flow direction with respect to the entire tank portion,
   7. The vehicle air conditioner according to claim 5, wherein when viewed from the direction along the one axis, all of the rotating shafts are provided so as to overlap the entire tank portion in the reference air flow direction. unit.
9. The rotating shaft is disposed on the downstream side of the air flow in the reference air flow direction with respect to the entire tank portion,
   7. The vehicle air conditioning unit according to claim 5, wherein at least a part of the rotation shaft is provided so as to overlap the entire tank portion in the reference air flow direction.
10. The rotating shaft is disposed on the downstream side of the air flow in the reference air flow direction with respect to the entire tank portion,
    7. The vehicle air conditioning unit according to claim 5, wherein all of the rotation shafts are provided so as to overlap the entire tank portion in the reference air flow direction.
11. The vehicle air conditioning unit according to any one of claims 5 to 10, wherein the rotation shaft is disposed in the first air passage.
12. The slide door opens and closes the first air passage and also opens and closes the second air passage, and adjusts the air volume ratio between the air flowing through the first air passage and the air flowing through the second air passage. The vehicle air conditioning unit according to any one of 1 to 11.
13. The vehicle air conditioning unit according to any one of claims 1 to 12, wherein the heating heat exchanger heats air flowing in from the air inflow surface by heat exchange with engine cooling water.

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