JP4755931B2 - Air intake structure for vehicle air conditioners - Google Patents

Description

  The present invention relates to an air intake structure that switches between internal air and external air into a case of a vehicle air conditioner.

Conventionally, as an air intake structure of this type, as described in Patent Document 1, for example, an internal air intake port and an external air intake port that open to a case of a vehicle air conditioner are alternatively used by a rotary damper. What is closed is known. When a rotary damper is used, there is an advantage that an installation space is reduced as compared with a flat damper. In addition, when the vehicle is traveling at high speed, wind pressure (ram pressure) acts on the rotary damper that closes the outside air inlet in a direction perpendicular to the swinging direction, so that the damper can be opened by the wind pressure. It is easy to prevent leakage of outside air.
JP 9-188124 A

  By the way, in general, in an air conditioner for a vehicle mounted in an instrument panel, an outside air intake duct is provided on the vehicle front side of the case, but in order to avoid interference with a vehicle member arranged around the duct, Cannot be extended straight toward the front side of the vehicle, and may be shifted or tilted to one side in the vehicle width direction.

  If the outside air intake duct is provided by shifting in the vehicle width direction, the opening at the front end of the vehicle and the outside air intake opening at the rear end of the vehicle are displaced in the vehicle width direction, and the rotary damper As a result of the biased wind pressure acting in the vehicle width direction, the smooth operation may be hindered. This requires an increase in link rigidity and actuator output, which is not preferable.

  That is, when the front and rear open ends of the outside air intake duct are displaced in the vehicle width direction as described above, the wind pressure acting on the rotary damper on one side in the vehicle width direction where the front and rear open ends overlap in the front and rear direction. Since the frictional resistance between the damper support shaft portion on one side and its bearing portion increases, and the wind pressure acts biased in this way, both the support portions of the rotary damper are twisted. Such a force acts, and this also increases the frictional resistance with the bearing portion, and hinders the smooth operation of the damper.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a vehicle air conditioner having a rotary damper for switching and taking in the inside and outside air into the case. In the case where it is provided so as to be shifted in the width direction, it is intended to ensure the smooth operation of the rotary damper even during high-speed traveling by devising the shape of the outside air intake port which is the opening at the rear end.

  In order to achieve the above object, in the present invention, in order to reduce the bias of the wind pressure acting on the rotary damper during high speed traveling, the outside air intake is taken on one side in the vehicle width direction where the front end opening of the outside air intake duct is displaced. The opening area of the entrance is smaller than the other side.

That is, the invention of claim 1 is directed to an air intake structure in which the inside air and the outside air are switched and taken into a case of an air conditioner mounted in an instrument panel of the vehicle. It is a semi-cylindrical shape extending in the width direction, a step is formed so that one side of the arc-shaped wall in the vehicle width direction has a smaller diameter than the other side, on the vehicle front side and the vehicle rear side of the arc-shaped wall, The outside air intake for taking in the air outside the vehicle interior and the inside air intake for taking in the air inside the vehicle interior are opened so as to extend in the vehicle width direction, and each of these openings is wider than the step. The range on the one side in the direction is a small area range having a smaller area than the other side, and the outside air inlet and the inside air inlet are selectively swung around the vehicle width direction axis in the case. Close the rotary damper is disposed, Oscillating support shafts on both axial sides of the rotary damper are rotatably supported by the case, and the rotary damper alternatively faces the outside air intake and the inside air intake on the inner peripheral side of the arcuate wall. There is an outer peripheral wall portion, and the outer peripheral wall portion is also provided with a step having a shape corresponding to the step of the arcuate wall, on the one side in the vehicle width direction from the periphery of the outside air intake port toward the vehicle front side. An outside air intake duct is provided so as to extend while shifting, and when viewed in the vehicle front-rear direction, an opening at the front end of the outside air intake duct and an outside air intake opening that is an opening at the rear end of the vehicle have a vehicle width. It is arranged so as to overlap more than half of each other in the direction, and the center position in the vehicle width direction at the opening at the front end of the vehicle is included in the small area range of the outside air intake in the vehicle width direction And

  In the vehicle air conditioner as described above, the outside air intake duct is provided so as to be shifted to one side in the vehicle width direction, so that the wind pressure (ram pressure) acting during high speed traveling of the vehicle in the vehicle width direction as it is. In the above configuration, the opening area on one side in the vehicle width direction of the rear end opening (outside air inlet) of the duct is made smaller than that on the other side in the above configuration, so that it acts on one side in the vehicle width direction accordingly. The wind pressure to be reduced can be reduced, the deviation of the wind pressure acting on the rotary damper can be reduced, and the smooth operation can be ensured.

Furthermore , the opening area of the outside air intake can be changed abruptly on one side and the other side in the vehicle width direction across the step, and the area on one side in the vehicle width direction is sufficient while ensuring the required opening area as a whole. Can be set small. Since the rotary damper has an outer peripheral wall portion that selectively faces the outside air inlet and the inner air inlet on the inner peripheral side of the arc-shaped wall, the outer peripheral wall portion also has a step on the arc-shaped wall. A step having a corresponding shape may be provided.

Also , the wind pressure acts particularly strongly at the rear end opening (outside air inlet) of the outside air intake duct at the position corresponding to the center position in the vehicle width direction at the front end opening of the duct when viewed in the vehicle front-rear direction. If the small area range is set so as to include, the effect of the invention can be sufficiently obtained.

More preferably, when viewed in the vehicle front-rear direction, a central range obtained by dividing the opening at the front end of the outside air intake duct into approximately three equal parts in the vehicle width direction is included in the small area range of the outside air inlet in the vehicle width direction. if is is that which (according the invention of claim 2), this, in response to a range which acts strongly wind pressure, can be set small areal extent of the outside air inlet to the optimum position, more action of invention It becomes effective.

More preferably, when the swing support shaft of the rotary damper is pivotally supported on both side walls in the vehicle width direction of the case, the support shaft on one side in the vehicle width direction passes through the case side wall, It is drivingly connected to an output portion of an actuator attached to the side wall of the case (invention of claim 3 ). By doing this, the damper support shaft on one side in the vehicle width direction, where the frictional resistance between the bearing and the bearing is likely to increase due to wind pressure, is driven directly by the actuator, thereby ensuring the smooth operation of the rotary damper more reliably. be able to.

  As described above, according to the present invention, in the vehicle air conditioner provided with the rotary damper for switching and taking in the outside air into the case, when the outside air intake duct is provided shifted in the vehicle width direction. By making the opening area of the outside air intake on the shifted side smaller than that on the opposite side, it is possible to reduce the bias of the wind pressure acting on the rotary damper during high speed traveling and to ensure its smooth operation. .

  FIG.1 and FIG.2 is the perspective view which respectively looked at the vehicle air conditioner 1 which concerns on embodiment of this invention from the rear side and front side of the vehicle front-back direction. Unless otherwise specified in the following description, “front” and “rear” mean “front in the vehicle front-rear direction” and “rear in the vehicle front-rear direction”, respectively, and “left” and “right” Means “left in the vehicle width direction” (left in FIG. 1) and “right in the vehicle width direction” (right in the same figure).

  Although not shown, the air conditioner 1 of this embodiment is provided between a dash panel that partitions an engine room and a passenger compartment in a left-hand drive vehicle and an instrument panel that faces the front of the occupant (that is, the instrument panel). The air-conditioning unit 2 is disposed at the approximate center in the vehicle width direction, and the blower unit 6 is disposed on the right side (passenger seat side).

-Air conditioning unit-
The air conditioning unit 2 cools or heats the air-conditioning air sent from the blower unit 6 and supplies it to the passenger compartment as conditioned air whose temperature or humidity is adjusted. As shown in FIG. A resin case 20 (hereinafter referred to as an air conditioning case) in which an intermediate duct 21 through which air from the blower unit 6 circulates is integrated. The air conditioning case 20 includes a lower case member 20a that forms a lower portion, a right case member 20b that forms a right half of the remaining upper portion, and a left case member 20c that forms a left half. Combined.

  As shown in FIG. 4, an intermediate duct 21 is formed at the front portion of the right side wall of the air conditioning case 20 so as to straddle the lower case member 20 a and the right case member 20 b. Further, as shown in FIG. 3, a defrost port 22 divided into a plurality of regions is opened across the left and right case members 20b and 20c on the front side of the upper surface portion of the air conditioning case 20, while Similarly, a vent port 23 is opened on the rear side.

  Further, a rear foot duct 24 is formed on the rear side of the air conditioning case 20 so as to open downward. Although not shown, a duct connected to the lower end of the duct 24 extends to the foot space of the rear seat. . Also, front foot ducts 25 (only the left side are shown) are disposed on the left and right side walls of the case 20 near the upper end of the rear foot duct 24 so as to extend downward.

  As shown in FIG. 5, the defrost port 22 and the vent port 23 are provided with a defrost damper 26 and a vent damper 27 for opening and closing the openings, respectively. The foot dampers 28 for opening and closing the communicating portions to the front and rear foot ducts 24 and 25 are arranged. Each of the dampers 26 to 28 has a support shaft extending in the vehicle width direction, and both ends of the support shaft are rotatably supported on the left and right side walls of the air conditioning case 20.

  Further, one end portion (in this example, the right end portion) of each of the support shafts of the dampers 26 to 28 protrudes outward through the right side wall of the air conditioning case 20, respectively. 4, the actuator motor 29 is attached to the outside of the right side wall of the case 20 via a link mechanism 30. This actuator motor 29 is on one side (right side in FIG. 4) with respect to the three boss portions 31, 31,... (See FIG. 6) projecting on the right side wall of the case so as to avoid interference with the link mechanism 30. It is fastened by screws 32, 32,... Directly via the bracket 80 and on the other side (the left side).

  As shown in an enlarged view in FIG. 6, the link mechanism 30 is driven by a drive side link member 33 that is rotationally driven by an output shaft 29 a of an actuator motor 29 (shown by a virtual line), and is driven from the drive side link member 33. Three driven side link members 34 to 36 that operate by transmitting force, and crank members 37 that are respectively fixed to the support shafts of the dampers 26 to 28 and rotated by the driven side link members 34 to 36, respectively. ~ 39.

  The drive side link member 33 is a substantially circular plate member formed by injection molding of a resin material as shown in FIG. 7 when viewed from the opposite side to FIG. A pin member or the like (not shown) is inserted from one side (the rear side in the figure, the front side in FIG. 6) into the round hole 33 a that penetrates the air hole 20 and is rotatably attached to the right side wall of the air conditioning case 20. In addition, a round hole 33b is formed in a penetrating manner so that a pin at the tip of a lever member attached to the motor output shaft 29a (shown in phantom line in FIG. 6) is pivotally inserted at a predetermined distance from the center and radially outward. Has been.

  In addition, on the surface shown on the near side in FIG. 7, three cam grooves 33c and 33d having a predetermined shape that extend in the circumferential direction and bend in the radial direction at a portion closer to the outer periphery of the drive side link member 33. 33e, and the pins 34a to 36a of the driven side link members 34 to 36 are slidably fitted (engaged) to each other, as indicated by broken lines in FIG. In addition, the code | symbol 33f of illustration is a through-hole formed so that interference with the boss | hub part 31 by the side of the case 20 may be avoided.

  Each of the driven side link members 34 to 36 is a plate member that is long in one direction formed by injection molding a resin material, and one end portion in the longitudinal direction is formed larger than the other, and Pins 34a to 36a (engaging protrusions) that protrude from the intermediate portion to one side in the thickness direction and engage with the cam grooves 33c to 33e of the drive side link member 33 are formed. The relatively large end portions (large end portions) of the driven side link members 34 to 36 are respectively formed with round holes 34b to 36b penetrating in the thickness direction, and are rotated on the right side wall of the air conditioning case 20 by a pin member or the like. While being movably attached, pins 34c to 36c project from the relatively small end portions (small end portions) on the side opposite to the pins 34a to 36a of the intermediate portion, respectively.

  And the small end part of each said driven side link member 34-36 can be rotated with respect to the crank members 37-39 of each damper 26-28 by the pins 34c-36c, respectively, and each of these crank members 37-39 is provided. It is slidably connected in the longitudinal direction. That is, each of the crank members 37 to 39 is a plate member that is long in one direction formed by injection molding of a resin material, and one end portion in the longitudinal direction thereof cannot be rotated on the support shafts of the dampers 26 to 28, respectively. In addition to being fixed, elongated holes 37a to 39a are formed over substantially the entire length in the longitudinal direction excluding the fixing portion, and pins 34c to 36c at the small ends of the driven side link members 34 to 36 are provided there. Each is fitted so as to be rotatable and slidable along the elongated holes 37a to 39a.

  With such a configuration, when the drive-side link member 33 is rotated by the actuator motor 29, the driven-side link members 34 to 36 correspond to the displacement of the pins 34a to 36a that engage with the cam grooves 33c to 33e. Swings around the large end, and crank members 37 to 39 connected to the small end by pins 34c to 36c respectively swing together with the respective support shafts of the dampers 26 to 28. As a result, the three dampers 26 to 28 swing in synchronization with each other.

  Further, inside the air conditioning case 20, as shown by the arrows in FIG. 5, air introduced from the intermediate duct 21 flows into the defrost port 22, vent port 23, and front and rear foot ducts 24 and 25. The temperature control damper 40 is arranged so that the route to reach is divided into a heating passage and a non-heating passage on the way. Although not shown, the temperature control damper 40 is arranged on each of the left and right sides of a partition wall that divides the interior of the air conditioning case 20 into left and right sides, and each is in the vehicle width direction, like the defrost damper 26 and the like. , One end of which protrudes out of the case, and is connected to the actuator motor 42 via a link member 41 and the like, as shown on the right side in FIGS.

  As shown in FIG. 5 again, an introduction space portion into which the air circulated in the intermediate duct 21 is first introduced is formed in the front portion of the air conditioning case 20, and this introduction space portion and the temperature control damper 40 are In between, the evaporator 44 is arrange | positioned as a heat exchanger for cooling air. Although not shown in detail, the evaporator 44 is of a so-called tube and fin type in which, for example, aluminum alloy tubes and heat transfer fins are alternately arranged and integrated. In this example, the evaporator 44 is arranged vertically. The front faces the introduction space.

  A refrigerant inflow tank and an outflow tank are provided on the right side of the evaporator 44, and a refrigerant inlet side pipe 45 and an outlet side pipe 46 are connected to each of them. As shown in FIGS. 1, 3, and 4, the pipes 45 and 46 penetrate the right side wall of the air conditioning case 20, are routed forward from above the intermediate duct 21, and then from the front end of the air conditioning case 20. It extends through the seal block 47 extending to the right side and extends to the engine room side. A low-temperature and low-pressure liquid refrigerant flows from a refrigerant circuit in an engine room (not shown) through the pipes 45 and 46, and the liquid refrigerant evaporates while circulating in the tube, thereby taking away ambient heat. Thus, the air passing between the heat transfer fins is cooled.

  Thus, the air flow that has passed through the evaporator 44 is distributed by the temperature control damper 40 to either the lower heating passage or the upper non-heating passage. In other words, a heater core 48 that is a heat exchanger for heating air is disposed vertically and obliquely downward and rearwardly of the temperature control damper 40, and is distributed downward by the temperature control damper 40. During the passage of the air flow between the heat transfer fins, the air is heated by exchanging heat with the high-temperature engine cooling water flowing through the tubes.

  The heater core 48 is of the tube-and-fin type, like the evaporator 44, and includes an introduction pipe 49 for introducing a high-temperature coolant from the engine side, and a lead-out pipe 50 for returning the coolant in the heater core 48 to the engine side. Are connected (see FIG. 2). These inlet pipe 49 and outlet pipe 50 penetrate the left side wall of the air conditioning case 20 and the front surface thereof is routed to the front of the intermediate duct 21, and then penetrate the seal block 47 in the same manner as the pipes 45 and 46 of the evaporator 44. And it extends to the engine room side.

  When the temperature control damper 40 is at the maximum heating position indicated by the solid line in FIG. 5, all the air that has passed through the evaporator 44 is directed to the heating passage, while at the maximum cold air position indicated by the phantom line in the figure. Sometimes all the air goes to the unheated passage. The temperature control damper 40 is driven by an actuator motor 42 so as to be positioned at a plurality of opening positions between the maximum cold air position and the maximum heating position. The distribution of the air flowing through the non-heating passage will change.

  Thus, the air flow once distributed to the heating passage and the non-heating passage by the temperature adjustment damper 40 merges above the temperature adjustment damper 40 to become conditioned air whose temperature or humidity is adjusted. That is, the space above the temperature control damper 40 and below the defrost damper 26 and the vent damper 27 is an air mix space portion in which cold air and heated air are mixed, and the conditioned air generated here is the defrost port 22, vent. It is sent out to the mouth 23 and the front and rear foot ducts 24 and 25 and is supplied from a predetermined place into the vehicle interior.

  In this embodiment, as shown in FIGS. 1 to 4, the drainage duct 51 for discharging the condensed water generated in the evaporator 44 of the air conditioning unit 2 to the outside is provided from the case 20 of the air conditioning unit 2 to the intermediate duct. 21 is provided so as to extend toward the blower unit 6 along the lower edge. The drainage duct 51 is integrally formed with a plate-like mounting plate 52 for fixing the air conditioning unit 2 to the dash panel, and a stud provided in the dash panel (not shown) is provided in a through hole 52a provided in the drainage duct 51. Bolts are inserted and fastened by nuts.

  As shown in FIGS. 1 to 4, plate-like mounting plates 53 and 54 that extend outward in the left and right directions near the respective upper ends are integrally formed on the left and right side walls of the air conditioning case 20. Each of the mounting plates 53 and 54 is superposed on a frame member (hereinafter referred to as an instrument panel member) of an instrument panel (not shown) from above and below and fastened. Through holes 53a and 54a through which stud bolts (not shown) provided in the instrument panel member are inserted are opened.

-Blower unit-
Next, the air blowing unit 6 that supplies air for air conditioning to the air conditioning unit 2 will be described. The blower unit 6 of this embodiment includes a resin case 60 (hereinafter referred to as a blower case) integrally formed with a connection frame portion 61 (see FIG. 8) connected to the intermediate duct 21 on the air conditioning case 20 side. The blower case 60 is formed by combining two divided bodies of a right case member 60a and a left case member 60b that are divided in the vehicle width direction.

  As shown in FIGS. 1 and 2 in addition to FIG. 8, the upper portion of the blower case 60 is basically a semi-cylindrical shape extending in the vehicle width direction, and is located behind the arcuate upper wall (arc-shaped wall). A lattice-shaped inside air inlet 62 for taking in air in the passenger compartment is formed so as to extend in the vehicle width direction. On the other hand, an outside air intake duct 63 having a substantially rectangular cross section is formed on the front side of the arc-shaped wall so as to extend obliquely upward and obliquely to the left, and the air flow communicating with the passage in the duct 63. The upper space in the case 60 is an air intake space portion for taking in air from either the vehicle interior or the vehicle exterior.

  Further, the lower part of the blower case 60 is formed in a spiral shape with its outer peripheral side centered around the vertical axis, and the air intake space is not shown on the inner peripheral side of the inner spiral path. A centrifugal multiblade fan that sucks in air taken into the section and sends it to the outer peripheral side is housed. On the other hand, the end of the spiral passage opens at the front lower portion of the left side wall of the blower case 60 to form a blower opening to the air conditioning unit 2 and extends outward (left side) from the periphery of the opening. A connection frame portion 61 connected to the 20 intermediate ducts 21 is formed.

  In addition, the intermediate part between the upper part of the case formed in a semi-cylindrical shape and the lower part of the case formed in a spiral shape as described above is formed in a rectangular shape surrounding the front, rear, right and left, and is taken into the air intake space. An air filter for filtering the generated air is arranged. Although not shown, a rectangular opening for exchanging the air filter is formed at the rear of the case intermediate portion, and a lid member 64 for opening and closing the opening is provided.

  Further, as shown in FIGS. 1 and 2 in addition to FIG. 8, mounting plates 65, 66, and 67 for fixing the blower unit 6 to the dash panel are integrally formed in the blower case 60. That is, the mounting plate 65 is provided so as to extend outward from the upper left side wall of the blower case 60, and has a horizontal plate portion in which a vertical through hole 65a is opened on a substantially horizontal mounting surface, and a vertical plate hanging from the rear end. As shown in FIG. 1, it is overlapped with a mounting plate 54 formed on the right side wall of the air conditioning case 20 and is fastened together with an instrument panel member outside the figure. It has become.

  The mounting plates 66 and 67 extend from the vicinity of the rear end of the upper and lower right side walls of the blower case 60 to the rear oblique right side, and then bend and extend further to the right side. , 67a are formed of plate members. The upper and lower mounting plates 66 and 67 are superimposed on an instrument panel member (not shown) in the front-rear direction, and stud bolts provided on the upper and lower mounting plates 66 and 67 are inserted through the through holes 66a and 67a. To the instrument panel member.

  In the air intake space formed in the upper part of the blower case 60 as described above, the internal air inlet 62 and a communication portion 63a to the passage in the external air intake duct 63 (see FIG. 2, hereinafter, external air). The inside / outside air switching damper 70 is disposed so as to alternatively close the intake port). The inside / outside air switching damper 70 is a rotary damper that swings about an axis in the vehicle width direction, and as shown in FIG. A pair of substantially wedge-shaped side wall portions 71, 71 that extend, an outer peripheral wall portion 72 that is integrally formed so as to connect the outer peripheral edges thereof, and pivot axes from the inner peripheral ends of the side wall portions 71, 71, respectively. And support shaft portions 73 and 73 (oscillation support shafts) protruding outward along Y.

  In addition, flanges 74a and 74a are formed on both side edges in the swing direction of the side walls 71 and 71 so as to protrude outward in the swing axis Y direction, respectively, Flange 74b, 74b is formed so as to protrude radially outward at both side edges in the swinging direction, and these flanges 74a, 74b wrap around the corners where each side wall 71 and outer peripheral wall 72 are connected to each other. The flange 74 is configured to be connected and to circulate the entire inside / outside air switching damper 70.

  A sealing member 75 made of foamed resin is attached to the flange 74 of the inside / outside air switching damper 70 so as to sandwich it from both sides in the damper swinging direction. In addition, the inside / outside air switching damper 70 corresponds to a step of a blower case 60 described later so that the left side (front side in the figure) arranged on the left side of the case has a smaller diameter than the right side (the back side in the figure). A stepped portion 72 a is formed on the outer peripheral wall portion 72.

  The left and right support shaft portions 73, 73 of the inside / outside air switching damper 70 are respectively inserted into through holes (not shown) formed in the left and right side walls of the blower case 60, and are rotatably supported (pivot). The tip end side of one of the support shaft portions 73 (in this example, the left support shaft portion) protrudes outward from the case, and as shown in FIG. The actuator motor 77 is connected.

  Then, the actuator motor 77 swings the inside / outside air switching damper 70, and the outer peripheral wall 72 moves in the circumferential direction on the inner peripheral side of the circumferential wall of the blower case 60. When facing the intake port 62 and closing it, the outside air intake port 63a is fully opened, and an outside air introduction state in which only the air outside the vehicle compartment is taken in from the outside air intake duct 63 is set. On the other hand, when the outer peripheral wall portion 72 of the inside / outside air switching damper 70 faces the outside air inlet 63a and closes it, the inside air inlet 62 is fully opened, and the inside air is introduced from this position to take in only the air in the vehicle interior.

  Then, the air taken into the air intake space portion in the blower case 60 from either the inside or outside of the vehicle interior is filtered through the air filter below and then sucked into the centrifugal multiblade fan. It is discharged into a spiral passage at the bottom of the case surrounding the outer periphery. The air flow whose direction is changed in the spiral path is sent out to the air conditioning unit 2 from the end of the spiral path that opens in the left side wall of the blower case 60 through the intermediate duct 21.

  By the way, in the air blow unit 6 of this embodiment, as described above, the outside air intake duct 63 extending obliquely forward and upward from the front side of the upper arc-shaped wall is inclined so as to be shifted to the left side toward the front side. This is to avoid interference with members in the instrument panel when the vehicle is mounted. This causes the wind pressure (ram pressure) acting on the inside / outside air switching damper 70 during the high-speed traveling of the vehicle to be reduced. As a result, the smooth operation of the inside / outside air switching damper 70 may be hindered.

  That is, when viewed in the vehicle longitudinal direction as schematically shown in FIG. 10, the front end opening 63b of the outside air intake duct 63 is shifted to the left from the outside air inlet 63a into the case which is the rear end opening. The wind pressure acting on the inside / outside air switching damper 70 located at the intake port 63a from the front is stronger on the left side than on the right side. More specifically, in this embodiment, the outside air inlet 63a and the duct front end opening 63b overlap with each other by more than half in the vehicle width direction, and the left side edge of the outside air inlet 63a extends from the left side edge of the duct front end opening 63b. To the right, the vehicle is displaced by approximately 1/3 of its length in the vehicle width direction.

  Further, as shown in the figure, when viewed in the vehicle front-rear direction, a central range A1 (shown by hatching in the drawing) of the duct front end opening 63b divided into approximately three equal parts in the vehicle width direction is the left side of the outside air intake port 63a. The range A2 (indicated by hatching in the figure) and the vehicle width direction generally overlap. In this way, the wind pressure acts particularly strongly on the inside / outside air switching damper 70 in the center range A1 of the duct front end opening 63b and the left side range A2 of the outside air inlet 63a opposite to the front and rear.

  When the wind pressure acting on the inside / outside air switching damper 70 is biased to the left side and becomes stronger, the frictional resistance between the left damper support shaft portion 73 and the bearing portion thereof, that is, the through hole in the case left side wall increases, When the wind pressure acts in a biased manner, a force that squeezes both the support shaft portions 73 and 73 of the inside / outside air switching damper 70 acts, and this also increases the frictional resistance, thereby switching between the inside and outside air switching. The smooth operation of the damper 70 is hindered.

  On the other hand, in this embodiment, as described above, in the left side range A2 of the outside air inlet 63a corresponding to the central range A1 of the duct front end opening 63b, the length in the circumferential direction is shortened and the opening is compared with the right side. The wind pressure is weakened by reducing the area. That is, as shown in FIGS. 1 and 8 and the like, a stepped portion 68 is formed on the arc-shaped wall at the top of the blower case so that the left side (one side in the vehicle width direction) has a smaller diameter than the right side (the other side). The inside air inlet 62 extending in the vehicle width direction on the rear side of the arc-shaped wall has a circumferential length of the opening that is shorter on the left side of the stepped portion 68 than on the right side.

  Similarly, an outside air inlet 63a (a rear end opening of the outside air intake duct 63) that opens so as to extend in the vehicle width direction on the front side of the arcuate wall is formed in the circumferential direction of the opening as shown in FIG. Since the length is shorter on the left side of the step portion 68 than on the right side, and the position of the step portion 68 is exactly the right edge of the left range A2, the opening area of the left range A2 is in the right range. It is much smaller than that. That is, the opening area of the left range A2 corresponding to the central range A1 of the duct front end opening 63b and particularly the wind pressure during high speed traveling is reduced, and the wind pressure acting on the inside / outside air switching damper 70 is reduced accordingly. Further, the deviation of the wind pressure in the vehicle width direction due to the deviation of the outside air intake duct 63 can be reduced.

  Therefore, in the vehicle air conditioner 1 according to this embodiment, since the outside air intake duct 63 is provided to be shifted to the left side in the blower unit 6, it acts on the inside / outside air switching damper 70 while the vehicle is traveling at high speed. When the wind pressure to be biased becomes stronger on the left side, the area of the outside air inlet 63a in the left range A2 is reduced to reduce the wind pressure bias, thereby increasing the frictional resistance caused by the wind pressure bias. The smooth operation of the inside / outside air switching damper 70 can be ensured.

  Further, the stepped portion 68 is formed on the arc-shaped wall above the blower case 60 so that the opening area of the left side range A2 where the wind pressure acts particularly strongly is significantly smaller than the right side, so that the outside air intake 63a as a whole While ensuring the required opening area, the area of the left side range A2 can be set as small as intended, and the above-described effects can be sufficiently obtained.

Further, in this embodiment, as described above, the left damper support shaft portion 73 that may increase the frictional resistance is directly driven by the actuator motor 77 via the link member 76. Thus, the smooth operation of the inside / outside air switching damper 70 can be ensured more reliably .

  As described above, the present invention is suitable as an air conditioner for automobiles because the smooth operation of the rotary damper is not hindered by the wind pressure even when the vehicle is traveling at high speed.

It is the perspective view seen from the vehicles back-and-forth direction back side of the air-conditioner for vehicles concerning an embodiment. It is the perspective view similarly seen from the front side. It is the perspective view which looked at the air-conditioning unit of the vehicle air conditioner from the vehicle front-back direction rear side. It is the side view which looked at the air-conditioning unit from the vehicle width direction right side. It is the layout figure which looked at the inside of an air-conditioning unit from the vehicle width direction right side. It is an enlarged view of the link mechanism seen from the vehicle width direction right side. It is a front view of a drive side link member. It is the perspective view which looked at the ventilation unit from the diagonal left side of the vehicle front-back direction rear side. It is a perspective view of an inside / outside air switching damper. It is explanatory drawing which shows typically the relationship between the opening position of the front end and rear end of an external air intake duct seeing in the vehicle front-back direction.

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 6 Blower unit 60 Blower case (case)
62 Inside air inlet 63 Outside air inlet duct 63a Outside air inlet (opening at the rear end of the duct)
63b Duct front end opening 68 Stepped portion 70 Inside / outside air switching damper (rotary damper)
72 Outer peripheral wall portion 72a Stepped portion 73 Support shaft portion (swinging support shaft)
77 Actuator motor A1 Center range of duct front end opening A2 Left side range of outside air intake (small area range)

Claims (3)

An air intake structure in which the inside air and the outside air are switched and taken into the case of the air conditioner mounted in the instrument panel of the vehicle,
The upper part of the case has a semi-cylindrical shape extending in the vehicle width direction, and a step is formed so that one side of the arc-shaped wall in the vehicle width direction has a smaller diameter than the other side,
On the vehicle front side and the vehicle rear side of the arc-shaped wall, an outside air inlet for taking in air outside the passenger compartment and an inner air inlet for taking in air in the passenger compartment are opened so as to extend in the vehicle width direction, respectively. Each of these openings is a small area range in which the area on one side in the vehicle width direction is smaller than the other side in the vehicle width direction,
A rotary damper is disposed in the case so as to swing around an axis in the vehicle width direction and selectively close the outside air intake and the inside air intake, and swing support shafts on both sides in the axial direction of the rotary damper. Is rotatably supported by the case,
The rotary damper has an outer peripheral wall portion that selectively faces the outside air inlet and the inner air inlet on the inner peripheral side of the arc-shaped wall, and the outer peripheral wall portion also corresponds to the step of the arc-shaped wall. A step with a shape to be
An outside air intake duct is provided so as to extend from the periphery of the outside air inlet toward the vehicle front side while shifting to one side in the vehicle width direction,
When viewed in the vehicle front-rear direction, an opening at the front end of the outside air intake duct and an outside air intake opening that is an opening at the rear end of the vehicle are arranged so as to overlap each other by more than half in the vehicle width direction, and An air intake structure for a vehicle air conditioner , wherein a center position in the vehicle width direction of the opening at the front end of the vehicle is included in a small area range of the outside air intake in the vehicle width direction . When viewed in the vehicle longitudinal direction, the central range obtained by dividing the opening at the vehicle front end of the outside air intake duct into approximately three equal parts in the vehicle width direction is included in the small area range of the outside air inlet in the vehicle width direction. The air intake structure for a vehicle air conditioner according to claim 1 , wherein the air intake structure is an air intake structure. The pivot shafts of the rotary damper are pivotally supported on both side walls in the vehicle width direction of the case, and the support shaft on one side in the vehicle width direction passes through the case side wall and is attached to the case side wall. air intake structure of a vehicle air conditioning system according to claim 1 or 2, characterized in that it is drivingly connected to the output of the actuator.

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