JP5859234B2 - Air conditioner for vehicles - Google Patents

Description

  The present invention relates to an air mix type vehicle air conditioner including a heater core and an air mix damper.

  An HVAC unit (Heating Ventilation and Air Conditioning Unit) of an air conditioner mounted on a vehicle is provided with an evaporator, an air mix damper, a heater core, etc. in order from the upstream side in the air flow path in the unit case. The temperature-controlled air whose temperature has been adjusted is selectively passed through a plurality of blow mode switching dampers from any one of a face blow channel, a foot blow channel, a differential blow channel, and the like formed on the downstream side It is configured to be blown out.

  The air channel is branched into a bypass channel and a heating channel on the downstream side of the evaporator, and a heater core is disposed on the heating channel side. The flow rate ratio of the air flow divided into the bypass flow channel side and the heating flow channel side can be adjusted by the rotation angle of the air mix damper, and the air flow through the bypass flow channel and the air flow through the heater core are The temperature is adjusted to the temperature-controlled air at the set temperature by merging and mixing in the downstream area.

  The heater core is installed on the bottom surface side of the unit case so as to cross the heating flow path, and the upper surface is supported by a heater core upper support portion that extends across the entire width of the unit case from the left and right side surfaces of the unit case. ing. The heater core upper support section defines an air flow path at an upper portion of the heater core (see, for example, Patent Documents 1, 2, and 3).

Japanese Patent Laid-Open No. 5-96932 JP 2004-249946 A JP 2006-168432 A

  As described above, in the conventional HVAC unit, the lower portion of the heater core disposed in the heating flow path is supported by the bottom surface of the unit case, and the entire width direction of the upper surface extends from the left and right side surfaces of the unit case to the entire width direction. It was supported by an extended heater core upper support. For this reason, it is necessary to integrally form a heater core upper support portion having at least a half length in the width direction on both left and right side surfaces of the unit case.

  This heater core upper support part has a large width direction dimension, and it is necessary to increase the die-cutting gradient at the time of resin molding, the wall thickness of the base part becomes thick and the wall thickness at the tip side becomes thin, so that the wall collapses (Tilt) is likely to occur and the molding accuracy is not good. Such a problem is difficult to avoid from the current resin molding accuracy, and it has been difficult to keep the wall surface of the unit case from falling down. On the other hand, there is a certain gap between the heater core upper support and the rotating shaft of the air mix damper, and cold air cooled by the evaporator flows through this gap, but it is difficult to keep the wall surface of the unit case from falling down. For this reason, there is a problem in that the gaps vary, which causes a variation in the amount of cold air bypass, and deteriorates the temperature control performance.

  The present invention has been made in view of such circumstances, and a temperature adjustment is performed by setting a gap formed between the upper surface of the heater core and the rotating shaft of the air mix damper as a predetermined gap in the axial direction. An object of the present invention is to provide a vehicle air conditioner capable of facilitating the above and improving the temperature control performance.

In order to solve the above problems, the vehicle air conditioner of the present invention employs the following means.
That is, in the vehicle air conditioner according to the present invention, the air flow path in the unit case is branched into the bypass flow path and the heating flow path downstream of the evaporator, the heater core is disposed on the heating flow path side, A rotary shaft is disposed above the heater core, and an air mix damper is provided that adjusts the flow rate ratio of the air flow flowing through the bypass flow path and the heating flow path by rotating around the rotary shaft. In the vehicle air conditioner, the left and right side surfaces of the unit case are provided with a heater core support portion that supports only the upper left and right shoulder portions of the heater core, and the heater core support portion supports the upper surface side of the heater core, and A gap formed between the upper surface of the heater core and the rotation shaft of the air mix damper is set to a constant gap in the axial direction in the air mix damper. Provided gap adjusting part, wherein the gap adjusting part is a circular arc surface that its outer peripheral surface with the same center and the rotation center of the rotary shaft, constant the axial clearance regardless of the rotation angle of the air mixing damper It is the structure which can be set to a clearance gap .

According to the present invention, there is provided a vehicle air conditioner including an air mix damper in which a rotating shaft is disposed at an upper portion of a heater core, and only upper and left shoulders of the heater core are supported on the left and right side surfaces of the unit case. A heater core support portion is provided, and the heater core support portion supports the upper surface side of the heater core, and a gap formed between the upper surface of the heater core and the rotation shaft of the air mix damper is fixed to the air mix damper in the axial direction. A clearance adjustment unit is provided , and the outer peripheral surface of the clearance adjustment unit is an arc surface having the same center as the rotation center of the rotation shaft, and the axial clearance is set to a constant clearance regardless of the rotation angle of the air mix damper. since there is a set configurable, heater core upper surface supports only the upper right and left shoulders of the heater core provided on left and right side surfaces of the unit case Since the gap is formed between the heater core upper surface and the rotation shaft of the air mix damper, the gap is fixed in the axial direction by the gap adjustment portion provided on the air mix damper side. And it can set to the fixed clearance made as small as possible. Therefore, the temperature control performance due to the problem of the prior art in which the upper surface of the heater core is supported by the heater core support portion provided on the unit case side over the entire width, that is, the variation in the gap due to the inclination of the wall surface constituting the heater core support portion. By eliminating the deterioration and stabilizing the bypass air volume from the gap, it is possible to facilitate the temperature adjustment and improve the temperature control performance. In addition, the gap in the axial direction formed between the upper surface of the heater core and the rotary shaft of the air mix damper is formed by the gap adjusting portion whose outer peripheral surface is an arc surface having the same center as the rotation center of the rotary shaft. A constant gap can be set regardless of the rotation angle of the damper. Therefore, there is no variation in the axial gap depending on the rotation angle of the air mix damper, and it is possible to further facilitate the temperature adjustment and improve the temperature control performance.

Furthermore, the vehicle air conditioner of the present invention, wherein a in the above vehicle air conditioner, the gap adjusting unit, which in the axial direction around the axis of the rotary shaft is formed integrally with the rotating shaft And

  According to the present invention, since the gap adjusting portion is formed integrally with the rotary shaft around the axis of the rotary shaft along the axial direction, by providing the gap adjuster around the rotary shaft, Therefore, the structure of the heater core is not complicated, and the molding is difficult to be complicated. Therefore, the heater core support portion that has supported the upper surface of the heater core over the entire width is deleted, and the heater core While simplifying the support structure, the gap between the upper surface of the heater core and the rotating shaft can be set constant, facilitating temperature adjustment and improving temperature control performance.

  Furthermore, the vehicle air conditioner according to the present invention is the vehicle air conditioner according to any one of the above-described vehicles, wherein the gap adjusting unit rotates at least from the maximum cooling position to the maximum heating position, which is the rotation range of the air mix damper. It is provided corresponding to an angle range.

  According to the present invention, since the gap adjustment portion is provided corresponding to at least the rotation angle range between the maximum cooling position and the maximum heating position, which is the rotation range of the air mix damper, the air mix damper is temperature adjusted. The axial gap formed between the upper surface of the heater core and the rotating shaft of the air mix damper can be set to a constant gap by the gap adjusting unit in the entire rotation range for fulfilling the function. Therefore, it is possible to suppress an increase in cost by minimizing the installation range of the gap adjusting portion and reducing the change portion of the air mix damper.

  Furthermore, in the vehicle air conditioner according to the present invention, in any one of the above-described vehicle air conditioners, a protruding portion that protrudes in the anti-damper direction across the rotation shaft is formed integrally with the gap adjustment portion. The protruding portion is provided with a seal member that is in contact with the upper surface of the heater core in the vicinity of the maximum heating position and closes the axial gap.

  According to the present invention, a protrusion protruding in the anti-damper direction across the rotation shaft is formed integrally with the gap adjustment portion, and the protrusion is brought into contact with the upper surface of the heater core near the maximum heating position. Since the seal member for closing the axial gap is provided, the seal member provided at the protrusion from the gap adjustment portion is brought into contact with the upper surface of the heater core in the vicinity of the maximum heating position. An axial gap formed between the damper and the rotating shaft of the damper can be closed. Accordingly, in the vicinity of the maximum heating position, the bypass of the cold air from the gap can be eliminated, and the heating capacity can be maximized.

According to the present invention, since the upper surface of the heater core is supported by the heater core support portion that supports only the upper left and right shoulders of the heater core provided on the left and right side surfaces of the unit case, the rotation of the heater core upper surface and the air mix damper is performed. A gap is formed between the shaft and the gap, which can be set to a constant gap that is constant in the axial direction and made as small as possible by the gap adjustment portion provided on the air mix damper side. Deterioration of temperature control performance due to the problems of the prior art in which the upper surface of the heater core is supported by the heater core support portion provided on the unit case side over the entire width, that is, due to the gap variation due to the inclination of the wall surface constituting the heater core support portion By eliminating the problem and stabilizing the bypass air flow from the gap, it is easier to adjust the temperature and control the temperature. It can be improved Lumpur performance. In addition, the gap in the axial direction formed between the upper surface of the heater core and the rotary shaft of the air mix damper is formed by the gap adjusting portion whose outer peripheral surface is an arc surface having the same center as the rotation center of the rotary shaft. Since the gap can be kept constant regardless of the rotation angle of the damper, there is no variation in the axial gap due to the rotation angle of the air mix damper, further facilitating temperature adjustment and improving temperature control performance. be able to.

It is a longitudinal cross-sectional view of the vehicle air conditioner which concerns on one Embodiment of this invention. It is the disassembled perspective view which looked at the vehicle air conditioner shown in FIG. 1 from the heater core side. FIG. 2 is a configuration diagram around a heater core in a state where a lower case of the vehicle air conditioner shown in FIG. 1 is removed. It is a longitudinal cross-sectional view around the heater core support part of the vehicle air conditioner shown in FIG. It is a longitudinal cross-sectional view (A) and (B) which show the rotation state of the air mix damper of the vehicle air conditioner shown in FIG. It is a perspective view of the air mix damper shown in FIG.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view of a vehicle air conditioner (HVAC unit) according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the air conditioner as viewed from the heater core side.
A vehicle air conditioner (HVAC unit; Heating Venting and Air Conditioning Unit) 1 includes a resin-made unit case 2 that is formed by integrally joining a plurality of divided cases that are divided into upper, lower, left, and right sides. ing.

  Inside the unit case 2, the air flow blown from the blower unit 3 composed of the fan case 4, the impeller 5 and the fan motor 6 disposed on the side of the unit case 2 is forward and backward (left and right in FIG. 1). Direction) and an air flow path 7 is formed to flow downstream. An evaporator 8 constituting a refrigeration cycle (not shown) is disposed substantially vertically in the upstream portion of the air flow path 7.

  The air flow path 7 is branched into a bypass flow path 9 and a heating flow path 10 on the downstream side of the evaporator 8. As shown in FIG. 6, the air mix damper 11, in which the sub-damper 11 </ b> A is provided integrally with the rotation shaft 12, is connected to the branch portion between the bypass flow path 9 and the heating flow path 10. It is rotatably arranged at the center, and is configured to be able to adjust the flow rate ratio of the air flow flowing through the bypass flow path 9 and the heating flow path 10. A heater core 13 in which cooling water from an engine cooling water circuit (not shown) is circulated is disposed in the heating channel 10 substantially vertically.

  The bypass flow path 9 and the heating flow path 10 are merged in an air mix area 14 downstream of the air mix damper 11, and a face blowing flow path 15, a foot blowing flow path 16 and a differential blowing flow formed on the downstream side thereof. It communicates with the three outlet channels of the passage 17. A differential / face damper 18 for switching the blowing mode is provided between the face blowing channel 15 and the differential blowing channel 17. A foot damper 19 for switching the blowing mode is provided at the inlet of the foot blowing channel 16.

  As shown in FIG. 1, the differential / face damper 18 can be rotated around the rotation shaft 20 between a position where the face blowing flow path 15 is fully closed and a position where the differential blowing flow path 17 is fully closed. On the other hand, the foot damper 19 has a rotation shaft 21 around the position between the position where the foot blowing channel 16 is fully closed and the position where the channel connecting to the face blowing channel 15 and the differential blowing channel 17 is fully closed. The differential / face damper 18 and the foot damper 19 are at a blowing mode position selected via a link mechanism 22 comprising a lever and a link connected to the shaft ends of the rotary shafts 20 and 21. It can be turned.

  That is, when the two differential / face dampers 18 and the foot damper 19 are opened and closed, the blowing mode of the temperature-controlled air blown into the passenger compartment is changed to the face mode and the face blowing passage 15 that are blown out from the face blowing passage 15. A bi-level mode that is blown from both the foot blow channel 16, a foot mode that is blown from the foot blow channel 16, a differential / foot mode that is blown from both the foot blow channel 16 and the differential blow channel 17, It is possible to selectively switch to five blowing modes of the differential mode blown out from the differential blowing passage 17.

  As described above, the heater core 13 is disposed substantially vertically in the heating channel 10 in the unit case 2 so as to cross the channel. More specifically, as shown in FIGS. 3 and 4, the lower part of the heater core 13 is placed on the heater core installation portion 23 provided on the unit case 2 side on the bottom surface side of the heating flow path 10. The upper part is installed in a state where the left and right shoulder parts 13A, 13B are supported by heater core support parts 24, 25 integrally formed on the side surfaces 2A, 2B of the unit case 2.

  As shown in FIG. 4, the heater core support portions 24 and 25 are integrally formed on the inner surface of the unit case 2 so as to protrude inward from the left and right side surfaces 2A and 2B of the resin unit case 2 by a predetermined dimension. Thus, only the upper left and right shoulder portions 13A and 13B of the heater core 13 placed on the heater core installation portion 23 are supported. The support portions of the heater core support portions 24 and 25 have a C-channel cross section (see FIG. 1). It is set as the structure provided with the surfaces 26, 27, 28, and 29 (refer FIG.1, 4).

  Since the heater core support portions 24 and 25 are configured to support only the upper left and right shoulder portions 13A and 13B of the heater core 13, the support wall surface for supporting the upper surface 13C side of the heater core 13 over the entire width is eliminated. Thereby, the thickness etc. of the heater core support parts 24 and 25 are made thin, and the heater core support parts 24 and 25 and the rotating shaft 12 of the air mix damper 11 are installed in a state close to each other. Incidentally, with this configuration, the distance between the heater core 13 and the rotating shaft 12 of the air mix damper 11 is reduced by about 10 mm in the vertical and front-rear directions, and the HVAC unit 1 can be downsized.

  Further, in the present embodiment, by removing the support wall surface that has supported the upper surface 13C side of the heater core 13 over the entire width, the axial direction between the upper surface 13C of the heater core 13 and the rotary shaft 12 of the air mix damper 11 is eliminated. In order to make this axial gap as small as possible and to set a constant gap S in the axial direction, the gap adjusting portion 30 is integrally formed around the rotary shaft 12 of the air mix damper 11. doing. As shown in FIG. 3, both end portions of the gap adjusting portion 30 are notched to avoid interference with the heater core support portions 24 and 25.

  As shown in FIG. 5, the gap adjusting unit 30 has an outer peripheral surface 30 </ b> A that is an arc surface having the same center as the center O of the rotation shaft 12 of the air mix damper 11, and the shaft is independent of the rotation angle of the air mix damper 11. The direction gap can be set to a constant gap S (see FIG. 3). Further, the gap adjusting unit 30 is configured so that the air mix damper 11 is moved from the maximum heating position (MAX HOT position) in which the air mix damper 11 is in contact with the seal surface 2C on the unit case 2 side shown in FIG. Is provided in correspondence with the rotation angle range during the rotation to the maximum cooling position (MAX COOL position) in contact with the seal surface 2D on the unit case 2 side.

  Further, the gap adjusting portion 30 is integrally formed with a protruding portion 30B that protrudes toward the sub-damper 11A side (anti-damper direction) across the rotating shaft 12 of the air mix damper 11. As shown in FIG. 5A, the surface of the protrusion 30B abuts on the upper surface 13C of the heater core 13 near the maximum heating position, and the upper surface 13C of the heater core 13 and the rotary shaft 12 of the air mix damper 11 are in contact with each other. A seal member (insulator) 31 that closes the gap S fixed in the axial direction formed therebetween is provided.

With the configuration described above, according to the present embodiment, the following operational effects can be obtained.
The air flow blown from the blower unit 3 to the air flow path 7 is cooled by heat exchange with the refrigerant while passing through the evaporator 8, and a part of the air flow is bypassed according to the opening degree of the air mix damper 11. The flow path 9 side and the other part are circulated to the heating flow path 10 side. The hot air heated by the heater core 13 in the heating flow path 10 and the cold air that has passed through the bypass flow path 9 are mixed in the air mix area 14 and adjusted to a temperature-controlled air at a set temperature, and then the differential / face damper 18 and the foot damper are mixed. The air is blown into the vehicle compartment from any one of the face blowout flow path 15, the foot blowout flow path 16, and the differential blowout flow path 17 selected by opening and closing 19, and used for air conditioning in the vehicle compartment.

  The heater core 13 that heats the air flow divided into the heating flow path 10 heats the air flow by exchanging heat between the high-temperature cooling water circulated from the engine cooling water circuit and the air flow. It is arranged substantially vertically so as to cross the road 10. The heater core 13 is installed in a state of being placed on a heater core installation portion 23 provided on the bottom surface side of the heating flow path 10, and only the left and right shoulder portions 13 </ b> A and 13 </ b> B of the upper portion of the unit case 2 are installed. It is supported by heater core support portions 24 and 25 provided on the left and right side surfaces 2A and 2B, respectively.

  As described above, the upper surface of the heater core 13 is provided on the left and right side surfaces 2A and 2B of the unit case 2, and the upper surface, the end surface, and the front and rear side surfaces of the left and right shoulder portions 13A and 13B of the heater core 13 are pressed. The heater core 13 is supported at a predetermined position in the heating flow path 10 by supporting at least four shoulder portions by supporting the C core cross-sectional shape heater core support portions 24 and 25 having 26, 27, 28, and 29. It can be positioned and fixedly supported.

  Therefore, the heater core 13 can be firmly installed in the heating flow path 10 without providing support walls for supporting the upper surface 13C of the heater core 13 over the entire width on the left and right side surfaces 2A and 2B of the unit case 2. Therefore, the structure of the unit case 2 can be simplified, the molding can be facilitated, and the weight and the cost can be reduced by reducing the amount of resin used. Further, since a support wall for supporting the upper surface 13C of the heater core 13 over its entire width is not required and the heater core 13 and the rotary shaft 12 of the air mix damper 11 can be installed close to each other, the unit case 2 and thus the HVAC unit corresponding to the dimension. Therefore, the vertical and longitudinal dimensions of the HVAC unit 1 can be reduced, the HVAC unit 1 can be made compact and lightweight, and the mountability on the vehicle can be improved.

  Further, by removing the support wall that has supported the upper surface 13C of the heater core 13 over the entire width, an axial gap is formed between the upper surface 13C of the heater core 13 and the rotary shaft 12 of the air mix damper 11. However, in order to make the gap in the axial direction as small as possible and to make the gap a constant gap S in the axial direction, the gap adjustment portion 30 is integrally formed around the rotation shaft 12 of the air mix damper 11. . As a result, the gap formed between the upper surface 13C of the heater core 13 and the rotating shaft 12 of the air mix damper 11 is a gap S that is constant in the axial direction and made as small as possible by the gap adjusting unit 30. It can be.

  As a result, the upper surface 13C of the heater core 13 is supported by the heater core upper surface support portion provided on the unit case 2 side over the entire width, that is, due to the gap variation due to the inclination of the wall surface of the heater core upper surface support portion. By eliminating the deterioration of the temperature control performance that occurs and stabilizing the bypass air volume from the gap S, it is possible to facilitate temperature adjustment and improve the temperature control performance.

  Further, the outer peripheral surface 30A of the gap adjusting portion 30 is an arc surface having the same center as the rotation center O of the rotary shaft 12 of the air mix damper 11, and the axial gap is a constant gap regardless of the rotation angle of the air mix damper 11. S can be set. For this reason, the gap in the axial direction formed between the upper surface 13 </ b> C of the heater core 13 and the rotating shaft 12 of the air mix damper 11 is made constant by the gap adjusting unit 30 regardless of the rotation angle of the air mix damper 11. Therefore, there is no variation in the axial gap S depending on the rotation angle of the air mix damper 11, which also facilitates temperature adjustment and improves temperature control performance.

  Further, since the gap adjusting portion 30 is formed integrally with the rotary shaft 12 along the axial direction around the rotation shaft 12 of the air mix damper 11, the gap adjusting portion 30 is provided around the rotary shaft 12. Thus, there is no possibility that the original function of the air mix damper 11 will be adversely affected, the structure of the air mix damper 11 may be complicated, or molding may be difficult, and the heater core support that supports the upper surface 13C of the heater core 13 over its entire width. The gap S between the upper surface 13 </ b> C of the heater core 13 and the rotating shaft 12 is set constant while simplifying the support structure of the heater core 13, thereby facilitating temperature adjustment and improving temperature control performance. be able to.

  Furthermore, in the present embodiment, the gap adjustment unit 30 is only compatible with a rotation angle range from the maximum cooling position (MAX COOL position) to the maximum heating position (MAX HOT position), which is the rotation range of the air mix damper 11. With this configuration, an axial gap formed between the upper surface 13C of the heater core 13 and the rotary shaft 12 of the air mix damper 11 in the entire rotation range for the air mix damper 11 to perform the temperature adjustment function. Is set to a constant gap S by the gap adjusting unit 30. For this reason, it is possible to suppress an increase in cost by making the installation range of the gap adjusting unit 30 to be a necessary minimum and reducing the changed parts of the air mix damper 11.

  In the present embodiment, a protrusion 30B that protrudes in the anti-damper direction with the rotary shaft 12 interposed therebetween is integrally formed with respect to the gap adjustment part 30, and the upper surface 13C of the heater core 13 near the maximum heating position is formed in this protrusion 30B. And a sealing member 31 that closes the axial clearance S is provided. For this reason, the upper surface 13C of the heater core 13 and the air mix 13 are brought into contact with the upper surface 13C of the heater core 13 by bringing the seal member 31 provided in the protrusion 30B integrally formed with the gap adjusting portion 30 in the vicinity of the maximum heating position. The axial gap S formed between the damper 11 and the rotary shaft 12 can be closed. Therefore, in the vicinity of the maximum heating position, the bypass of the cold air from the gap S is eliminated and the heating capacity is maximized. can do.

  In addition, this invention is not limited to the invention concerning the said embodiment, In the range which does not deviate from the summary, it can change suitably. For example, in the above-described embodiment, the example in which the evaporator 8 and the heater core 13 are disposed substantially vertically has been described. However, the evaporator 8 and the heater core 13 are not necessarily disposed vertically, and may be disposed obliquely. Of course.

  In addition, the unit case 2 is configured by integrally joining a plurality of divided cases, but the divided form is not particularly limited, and the heater core support portions 24 and 25 are provided by the heater core 13. What is necessary is just to shape | mold integrally with respect to the appropriate division | segmentation case which hits the position to install. Furthermore, it goes without saying that the arrangement of the HVAC unit 1 and the blower unit 3 can be modified in various ways.

1 Vehicle air conditioner (HVAC unit)
2 Unit cases 2A and 2B Left and right side surfaces of unit case 7 Air flow path 8 Evaporator 9 Bypass flow path 10 Heating flow path 11 Air mix damper 12 Rotating shaft 13 Heater cores 13A and 13B Upper left and right shoulder portions 13C Heater core upper surfaces 24 and 25 Heater core Support part 30 Gap adjustment part 30A Outer peripheral surface 30B Protrusion part 31 Seal member O Center of rotation shaft S Gap

Claims (4)

The air flow path in the unit case is branched into a bypass flow path and a heating flow path downstream of the evaporator, a heater core is disposed on the heating flow path side, and a rotating shaft is disposed above the heater core. A vehicle air conditioner provided with an air mix damper that adjusts a flow rate ratio of an air flow flowing through the bypass flow path and the heating flow path by being rotated around a rotation axis,
Provided on both the left and right side surfaces of the unit case is a heater core support part that supports only the upper left and right shoulders of the heater core, and supports the upper surface side of the heater core by the heater core support part.
The air mix damper is provided with a gap adjusting portion that sets a gap formed between the upper surface of the heater core and the rotation shaft of the air mix damper to a constant gap in the axial direction ,
The clearance adjustment portion has an outer peripheral surface that is an arc surface having the same center as the rotation center of the rotation shaft, and the axial clearance can be set to a constant clearance regardless of the rotation angle of the air mix damper. An air conditioner for a vehicle characterized by the above . 2. The vehicle air conditioner according to claim 1 , wherein the gap adjusting unit is formed integrally with the rotary shaft along an axial direction around the axis of the rotary shaft. The gap adjusting unit, according to claim 1 or 2, characterized in that are provided corresponding to the rotation angle range between the maximum cooling position to a maximum heating position is the rotational range of at least the air mixing damper Vehicle air conditioner. A protrusion protruding in the anti-damper direction across the rotating shaft is formed integrally with the gap adjustment portion, and the protrusion is brought into contact with the upper surface of the heater core in the vicinity of the maximum heating position. The vehicle air conditioner according to any one of claims 1 to 3 , wherein a seal member for closing the gap is provided.

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