JP2007269186A - Seal structure of vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the rubbing noise of a seal part as a damper is oscillated without any increase of the cost or any defective seal caused by the aging degradation when a space to a seal surface S on a case side by winding a part of an outer seal member 75b around a pivot part 73 out of a seal member 75 of an inside/outside air changing damper 70 in a vehicular air-conditioner 1. <P>SOLUTION: The range s2 in which an outer circumferential surface of the outer seal member 75b provided around the periphery of the pivot part 73 is brought into slidable contact with the seal surface S while the inside/outside air changing damper 70 is oscillated between the inside air introducing position and an outside air introducing position is set to be a strip-like range of ≤5 mm in its oscillating direction. A recessed part s1 is formed in the seal surface S, and only the strip-like ranges s2, s2 continuous to both ends thereof are brought into slidable contact with an outer circumferential surface of the outer seal member 75. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure for sealing between an air intake provided in a case of an air conditioner for a vehicle and a rotary damper, and particularly relates to a seal structure around a swinging support shaft of the rotary damper.

  2. Description of the Related Art Conventionally, in order to switch between introduction of inside air and outside air in a vehicle air conditioner, an inside air intake opening and an outside air intake opening that open to the case are alternatively closed by a rotary damper. For example, the rotary damper described in Patent Document 1 will be described with reference to the reference numerals of the same document. The rotary damper is separated radially outward from the pivot axis of the rotary door 13 (rotary damper), and the inside / outside air switching box 10 ( A circumferential wall 13a facing the inside air introduction port 11 and the outside air introduction port 12 of the case), and a fan-shaped side plate portion 13b extending from both side ends of the circumferential wall 13a in the axial direction toward the inner oscillation axis. , And a rotation shaft 13c extending along the swing axis from the inner peripheral end of the both side wall portions 13b.

  The rotary door 13 is provided with bowl-shaped projecting wall portions 13d and 13e so as to circulate around the periphery of the outer surface from the circumferential wall 13a to both side plate portions 13b, and the projecting wall portions 13d and 13e. Packing materials 14 and 15 (seal members) made of an elastic material are disposed on both sides of the plate. When the rotary door 13 is at the outside air introduction position or the inside air introduction position, either one of the flange-like protruding wall portions 13d and 13e pushes against the case-side seal surfaces 10b to 10f via the packing materials 14 and 15. As a result, the packing materials 14 and 15 are appropriately compressed to prevent air leakage.

In such a structure of the conventional example, the side ends of the packing materials 14 and 15 attached to the flange-like protruding wall portion 13e of the side plate portion 13b of the rotary door 13 are separated from the inner surface of the case side wall so that they are the rotary door. 13 is prevented from rubbing in the middle of swinging, and an increase in operating force of the rotary door 13 due to sliding resistance can be prevented.
JP 9-188124 A

  By the way, in the said prior art example, as FIG. 3 etc. of the said literature clearly shows, the packing materials 14 and 15 are the outlines of the rotating shaft 13c of the rotary door 13 except for the connection part with the bowl-shaped protrusion wall part 13e. Since it is provided over the entire circumference and the part of the lower packing material 15 that circulates the rotating shaft 13c is in contact with the connecting part of the case-side seal surfaces 10c and 10e in a relatively wide range, When the door 13 swings, they may rub against each other and generate abnormal noise.

  For this reason, conventionally, grease has to be applied to the portion where the packing material 15 that circulates around the rotary shaft 13c rubs against the case-side seal surfaces 10c and 10e, which increases the cost.

  On the other hand, it is conceivable to cut off the packing material 15 in such a rubbing portion, but in this way, the packing material 15 is divided into two members, which increases the number of parts and assembly man-hours. In addition to the increase, when the packing materials 14 and 15 are formed of a foamed resin or the like, the cut portion is expanded due to shrinkage deformation due to deterioration over time, and the sealing performance may be impaired in the vicinity thereof.

  The present invention has been made in view of such various points, and the object of the present invention is to devise a seal structure around the rotary support shaft of a rotary damper for switching and taking in the inside and outside air in a vehicle air conditioner. Thus, the rubbing noise is reduced without causing a seal failure due to an increase in cost or aging.

  In order to achieve the above object, according to the present invention, a seal member is provided around a predetermined range corresponding to the swing range on the swing support shaft of the rotary damper, and is in contact with the outer peripheral surface of the seal member. The seal surface on the case side is formed so that the sliding contact range of the rotary damper accompanying the swing of the rotary damper is as narrow as possible in the swing direction.

  That is, when the rotary damper is provided so as to selectively close the inside air inlet and the outside air inlet that open to the case of the vehicle air conditioner, the rotary damper is provided with the inside air. It is configured to seal a gap with the inside air inlet when the outside air introduction position closes the intake port, while sealing a gap with the outside air inlet when the inside air introduction position closes the outside air inlet. Target seal structure.

  The case side wall on which the swing support shaft of the rotary damper is pivotally provided has a seal portion that protrudes inward from the case so that the seal surface of the upper surface faces the swing support shaft below the pivot support portion. On the other hand, when the rotary damper swings between the outside air introduction position and the inside air introduction position, the swing support shaft covers a predetermined range so that the outer peripheral surface is in sliding contact with the seal surface on the case side. The seal member is provided around. Then, the seal surface on the case side is formed so that the sliding contact range with the outer peripheral surface of the seal member is a band-shaped range narrower in the circumferential direction than the axial direction of the swing support shaft.

  With the above configuration, when the rotary damper swings between the outside air introduction position and the inside air introduction position, the outer peripheral surface of the seal member that is in circumferential contact with the swing support shaft so as to correspond to the swing range is on the case side. Although it comes into sliding contact with the seal surface, this sliding contact range is a narrow band-like range in the circumferential direction (direction in which the rotary damper and the support shaft swing) than the axial direction of the swing support shaft. Since these are narrower than the above, their rubbing noise is reduced.

  Further, for example, if the shape of the sealing surface on the case side formed of resin or the like is devised to narrow the sliding contact range with the sealing member, it is not necessary to cut off the sealing member formed of foamed resin or the like Therefore, there is no risk of an increase in cost due to an increase in the number of parts to be assembled, and even though the entire seal member shrinks and deforms due to aging, there is no concern that the cut portion will spread and the sealing performance will be impaired.

  Preferably, the sliding contact range between the seal surface on the case side and the outer peripheral surface of the seal member is a linear range of 3 mm or less in the circumferential direction (invention of claim 2). When the member is made of, for example, urethane foam, the rubbing sound between the outer peripheral surface and the case-side sealing surface can be reduced to the extent that the vehicle occupant is not aware of it. However, considering the mass production variation of seal members and the decrease in sealing performance due to aging, the circumferential length of the slidable contact range is preferably long. Considering this point, it is preferable to set it to 5 m or less.

  Preferably, the seal surface on the case side has a recessed portion between the sliding contact ranges so that there are two or more belt-shaped (or linear) sliding contact ranges spaced apart in the circumferential direction. (Invention of claim 3). In this way, as described above, it is advantageous in stably securing the sealing performance around the swinging support shaft while reducing the rubbing sound accompanying the swinging of the rotary damper.

  More preferably, the case-side sealing surface is formed by a curved surface whose curvature is substantially constant or continuously changed in the circumferential direction from each sliding contact range to the recessed portion (invention of claim 4). If the sealing surface is formed by a smoothly continuous curved surface in this manner, it is advantageous for reducing the rubbing noise with the sealing member and also for suppressing the deterioration of the sealing member.

  As described above, according to the present invention, when a rotary damper for switching between inside and outside air is provided in the vehicle air conditioner, the seal member is provided around a predetermined range of the swing support shaft, The case-side seal surface that is in contact with the outer peripheral surface of the seal member is formed so that the sliding contact range of both of them accompanying the swing of the rotary damper is as narrow as possible in the swing direction. Without rubbing the formed seal member, it is possible to reduce the rubbing noise between the two, without causing an increase in cost and a sealing failure due to aging.

In particular, if a concave portion is provided on the sealing surface on the case side so that there are two or more belt-shaped (or linear) sliding contact ranges, the sealing performance can be improved while reducing the rubbing noise as described above. It is advantageous for ensuring the stability, and further, if a smooth curved surface is formed from the sliding contact range to the recessed portion, it is possible to further reduce the rubbing noise and to suppress the deterioration of the seal member.

  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 disposed 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. Yes, it includes an air conditioning unit 2 disposed at a substantially central portion in the vehicle width direction, and a blower unit 6 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 through the bracket 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 formed there. Each is fitted so as to be rotatable and slidable along the long 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. Oscillates around the large end, and crank members 37 to 39 coupled to the small end by pins 34c to 36c respectively oscillate integrally 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. 8, 9, and 11, the upper portion of the blower case 60 basically has a bowl shape extending in the vehicle width direction (left-right direction), and the rear half thereof is an arcuate surface that is inclined downward toward the rear side. In addition, a lattice-shaped inside air inlet 62 for taking in air in the vehicle is formed there. On the other hand, an outer air intake duct 63 having a substantially rectangular cross section extending obliquely upward and forward is formed in the front half of the upper part of the case, and an upper space in the air blowing case 60 communicating with a passage in the duct 63 is formed. It is an air intake space portion for taking in air from either the vehicle interior or the vehicle exterior.

  Moreover, as shown in FIGS. 8 and 9, the lower part of the blower case 60 is formed in a spiral shape with its outer peripheral side centering on the vertical axis, and on the inner peripheral side of the spiral path inside thereof, Although not shown, a centrifugal multiblade fan that sucks in air taken into the air intake space and sends it out to the outer peripheral side is housed. On the other hand, the end of the spiral passage opens to the lower front side 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 to A connection frame portion 61 connected to the intermediate duct 21 of the case 20 is formed.

  In addition, the intermediate part between the upper part of the case formed in a bowl 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, left and right, and is taken into the air intake space portion there. An air filter for filtering the 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 FIGS. 8 and 9, the blower case 60 is integrally formed with mounting plates 65, 66 and 67 for fixing the blower unit 6 to the dash panel. Yes. 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 portion in the upper part of the blower case 60 as described above, an internal air intake port 62 and a communication portion 63a to the passage in the external air intake duct 63 (see FIG. 11; hereinafter referred to as an external air intake port). The inside / outside air switching damper 70 is disposed so as to be closed alternatively. 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 walls 71, 71 that extend, and an outer peripheral wall 72 that is integrally formed so as to connect the outer peripheral edges thereof and alternatively faces the inner air inlet 62 and the outer air inlet 63 a, Support shaft portions 73 and 73 (oscillation support shafts) projecting outward along the swing axis Y from the inner peripheral ends of the side wall portions 71 and 71, respectively.

  Further, flanges 74 are formed so as to circulate around the peripheral edges of the outer surfaces of the inner and outer air switching damper 70 from both side plate portions 71 and 71 to the outer peripheral wall portion 72. As will be described in detail below, when the inside / outside air switching damper 70 is at the outside air introduction position for closing the inside air inlet 62, the gap with the inside air inlet 62 is sealed. On the other hand, when the outside air inlet 63a is at the inside air introduction position where the outside air inlet 63a is closed, the gap with the outside air inlet 63a is sealed.

  That is, both the support shaft portions 73 and 73 of the inside / outside air switching damper 70 are rotatably supported (pivotally supported) by the blower case 60, and one of them (the left support shaft portion in this example) is supported. The tip protrudes outward through the left side wall of the case, and is connected to the actuator motor 77 via the link member 76 as shown in FIG. Driven by the actuator motor 77, the inside / outside air switching damper 70 is swung between the inside air introduction position and the outside air introduction position, whereby the inside air and the outside air are switched and taken into the air intake space.

  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.

  Here, the seal structure for sealing the gap between the inside / outside air switching damper 70 and the inside air inlet 62 or the outside air inlet 63a will be described in detail. As shown in FIG. 10, flanges 74a projecting outward in the swing axis Y direction are respectively formed on both side edges in the swing direction (circumferential direction) on the outer surfaces of both side walls 71, 71 of the inside / outside air switching damper 70. 74a is formed so as to extend radially outward from the vicinity of the support shaft portion 73. Further, flanges 74b and 74b projecting radially outward at both side edges in the swing direction are formed on the outer surface of the outer peripheral wall portion 72 so as to extend in the swing axis Y direction. The flanges 74 are configured so that 74 a and 74 b wrap around the continuous corners of the side wall 71 and the outer peripheral wall 72 and are connected to each other, and circulate around the entire inside / outside air switching damper 70.

  A sealing member 75 made of foamed resin is attached to the flange 74 so as to sandwich the flange 74 from both sides of the swinging direction of the inside / outside air switching damper 70. Each of the seal members 75 is formed in a U-shape, and a portion of the flange 74 on one side of the damper swinging direction (upper side in FIG. 10) is on the other side of the swinging direction, and the other side edge on the swinging direction ( The lower edge portion of the figure has a pair of inner seal members 75a and 75a bonded to one side of the swinging direction, that is, to the inside of the flange 74, and one outer seal bonded to the opposite outer side. It consists of member 75b.

  The outer seal member 75b is formed in a frame shape in which U-shaped members similar to the inner seal member 75a are connected to each other at the end portions and bent into a U-shape. The connected portions circulate around the proximal end sides of both the support shaft portions 73 and 73 of the inside / outside air switching damper 70 over a range of approximately 120 ° (see FIGS. 11 and 12). As described above, the front end sides of both the support shaft portions 73 and 73 are pivotally supported on the left and right side walls of the blower case 60, respectively, and extend from below the pivotal support portions to the front and rear ends of the blower case 60. Further, step portions 80 are respectively provided on the inner surfaces of the left and right side walls of the blower case 60.

  FIG. 11 shows the left case member 60b which accommodates the inside / outside air switching damper 70 by removing the right case member 60a of the blower case 60. The stepped portion projecting from the inner surface of the left side wall of the blower case 60 is shown in FIG. The upper surface of 80 is lowest below the pivotal support portion of the support shaft 73, and gradually increases from there to the vicinity of the lower edge of the front outside air inlet 63a and the vicinity of the lower edge of the rear inner air inlet 62. Inclined so as to be higher.

  Thus, the front end upper portions of the left and right step portions 80, 80 extending forward are connected to the left and right ends of the front rib 81 projecting inward from the case so as to extend along the lower edge of the outside air inlet 63a. A U-shaped sealing surface is formed by the front upper surface 80 a of the stepped portion 80 and the upper surface of the front rib 81. Similarly, the rear end upper portions of the step portions 80 on both the left and right sides are connected to the left and right ends of the rear rib 82 projecting inward from the case so as to extend along the lower edge of the inside air inlet 62, respectively. A U-shaped sealing surface is also formed by the rear upper surface 80 b of the stepped portion 80 and the upper surface of the rear rib 82.

  Further, on the inner surfaces of the left and right side walls of the blower case 60, side ribs 83 project from the upper portion of the pivot support portion of the damper support shaft portion 73 to the vicinity of the upper edge of the outside air intake port 63a. The upper ends of the side ribs 83 and 83 are connected to the left and right ends of the upper rib 84 projecting inward from the case so as to extend along the upper edge of the outside air inlet 63a. The front surfaces of the left and right side ribs 83 and 83 and the front surface of the upper rib 84 constitute a U-shaped seal surface, and similarly, the rear surfaces thereof constitute a U-shaped seal surface.

  As shown in FIG. 11, when the inside / outside air switching damper 70 is in the inside air introduction position where the outside air inlet 63a is closed and the inside air inlet 62 is fully opened, one side in the swing direction of the flange 74 of the inside / outside air switching damper 70 The part (left side in the figure) is pressed against the rear surfaces of the left and right side ribs 83 and 83 and the upper rib 84 via the inner seal member 75a, and the part on the other side in the swing direction of the flange 74 (right side in the figure) Is pressed against the front upper surface 80a of the left and right step portions 80 and the upper surface of the front rib 81 via the outer seal member 75b. Thus, the gap between the inside / outside air switching damper 70 and the outside air intake 63a is sealed.

  On the other hand, when the inside / outside air switching damper 70 is in the outside air introduction position where the inside air inlet 62 is closed and the outside air inlet 63a is fully opened, the portion of the flange 74 on one side in the damper swinging direction is not shown. While being pressed against the upper surfaces of the rear upper surface 80b and the rear rib 82 of both stepped portions 80 via the outer seal member 75b, the other side of the swinging direction is formed by the left and right side ribs 83, 83 and the upper rib 84. The gap between the inside / outside air switching damper 70 and the inside air inlet 62 is sealed by being pressed against the front surface via the inner seal member 75a.

  Further, as a characteristic part of the present invention, in this embodiment, in the step portions 80, 80 on the left and right side walls of the blower case 60, the center in the front-rear direction facing below the support shaft portion 73 of the inside / outside air switching damper 70, respectively. A seal surface S is also provided on the upper surface of the position. The seal surface S is slidably contacted within a predetermined range with the outer peripheral surface of the outer seal member 75 b provided around the damper support shaft portion 73 to obtain a required sealing property, and when the inside / outside air switching damper 70 is swung. It is provided in such a manner that no loud rubbing noise is generated.

  That is, as shown by hatching in FIG. 12, the seal surface S facing the lower side of the damper support shaft portion 73 extends from the rear end portion of the front upper surface 80a of the stepped portion 80 to the front end portion of the rear upper surface 80b. As a whole, it is formed as a rectangular area that is long in the direction of swinging the damper. However, a recessed portion s1 is formed in the area excluding both ends in the longitudinal direction, and the inside / outside air switching damper 70 is connected to the inside air. Even when swinging between the introduction position and the outside air introduction position, the outer peripheral surface of the outer seal member 75b is not slidably contacted.

  In other words, when the inside / outside air switching damper 70 swings between the inside air introduction position and the outside air introduction position, the outer seal member 75b of the supporting shaft portion 73 that swings together with the seal surface S Are only a part of the ranges s2 and s2 connected to both ends of the recessed portion s1 on both sides in the longitudinal direction (damper swinging direction), and each sliding contact range s2 is a damper swinging direction as schematically shown in the figure. The (circumferential direction) is a band-like range narrower than the swing axis Y direction.

  Thus, the ranges s2 and s2 in contact with the outer seal member 75b provided around the damper support shaft portion 73 are narrowed by the amount of the recessed portion s1, so that the frictional noise is naturally reduced. In order to effectively reduce the rubbing noise, it is particularly preferable that the sliding contact range s2 with the seal member 75b is a linear range of 3 mm or less in the damper swinging direction, but the outer seal member 75b is foamed. When formed of urethane, it is considered that the length of the sliding contact range s2 in the damper swinging direction is preferably 5 m or less in consideration of variations in mass production and deterioration of sealing performance due to aging.

  Further, in this embodiment, even if the recessed portion s1 is provided on the seal surface S as described above, the curvature is substantially constant or continuously changed in the circumferential direction from the sliding contact ranges s2 on both sides to the recessed portion s1. Thus, the entire sealing surface S is formed by a smoothly continuous curved surface. This is preferable for reducing the friction noise between the seal surface S and the outer seal member 75b, and also preferable for suppressing the deterioration of the outer seal member 75b.

  Therefore, according to the vehicle air conditioner 1 according to this embodiment, a part of the seal member 75 is wound around the support shaft portion 73 of the inside / outside air switching damper 70 disposed in the case 60 of the blower unit 6, and the case side When the seal surface S is sealed, the range s2 of the seal surface S in which the outer seal member 75b of the support shaft portion 73 is in sliding contact with the swing of the inside / outside air switching damper 70 is swung. By forming a narrow band in the direction, it is possible to reduce the friction noise between the two and prevent the passenger from feeling uncomfortable.

  At that time, the outer seal member 75b formed of foamed resin or the like is not cut off, and the shape of the seal surface S integrally formed with the blower case 60 is devised so that the sliding contact range s2 with the outer seal member 75b is increased. Since it is narrow, the cost is not increased due to an increase in the number of parts of the seal member 75 and the number of assembling steps thereof, and even if the entire outer seal member 75b is contracted due to deterioration over time, the sealing performance is greatly impaired thereby. No worries.

  In this embodiment, one concave portion s1 is formed on the seal surface S on the case side so that the sliding contact ranges s2 and s2 are formed on both sides thereof. It is also possible to form only one range s2. However, it is preferable to form two or more sliding contact ranges s2 in order to stably secure the sealing performance around the damper support shaft portion 73.

  Moreover, although the said embodiment demonstrated the internal / external air switching damper 70 accommodated in the case 60 of the ventilation unit 6 separate from the air conditioning unit 2 as an example, it is not restricted to this, The present invention, The present invention can also be applied to a vehicle air conditioner in which the air blowing unit 6 is integrated with the air conditioning unit 2.

  As described above, according to the present invention, it is possible to reduce the rubbing sound from the periphery of the swinging support shaft of the rotary damper used for switching between the inside and outside air, and to cause a seal failure due to an increase in cost and aged deterioration. Therefore, it is particularly suitable as an air conditioner for automobiles with high frequency of switching between inside and outside air.

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 from the diagonal right side similarly. It is a perspective view of an inside / outside air switching damper. It is explanatory drawing which shows the seal structure of the left side case member of a ventilation case, and an internal / external air switching damper by removing a right side case member. FIG. 12 is an enlarged view of the periphery of the spindle portion in FIG. 11.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Air conditioning unit 6 Blower unit 60 Blower case (case)
62 Inside air inlet 63a Outside air inlet 70 Rotary damper 73 Support shaft (swinging support shaft)
75b Outer seal member (seal member)
80 Stepped part (seal part)
S Seal surface s1 Recessed part s2 Sliding contact range Y Damper swing axis

Claims (4)

A rotary damper is provided so as to alternatively close the inside air inlet and the outside air inlet that open to the case of the vehicle air conditioner, and when the rotary damper is in the outside air introduction position that closes the inside air inlet, A seal structure configured to seal a gap with the outside air inlet when the gap between the outside air inlet and the outside air inlet is in a position where the outside air inlet is closed while sealing the gap with the inside air inlet;
The case side wall on which the swing support shaft of the rotary damper is pivotally provided is provided with a seal portion that projects inward from the case so that the upper seal surface faces the swing support shaft below the pivot support portion. ,
When the rotary damper oscillates between the outside air introduction position and the inside air introduction position, a seal member is provided around the swing support shaft over a predetermined range so that the outer peripheral surface is in sliding contact with the seal surface on the case side. Established,
The case-side seal surface is formed such that a sliding contact range with the outer peripheral surface of the seal member is a band-shaped range narrower in the circumferential direction than the axial center direction of the swing support shaft. Air conditioner seal structure.   2. The vehicle air conditioner according to claim 1, wherein the seal surface on the case side is formed so that a sliding contact range with the outer peripheral surface of the seal member is a linear range of 3 mm or less in the circumferential direction. Seal structure.   The case-side seal surface is provided with a recessed portion between the sliding contact ranges so that there are two or more strip-shaped sliding contact ranges spaced apart in the circumferential direction. The seal structure of the vehicle air conditioner according to either 1 or 2. 4. The vehicle air conditioner according to claim 3, wherein the case-side sealing surface is formed by a curved surface whose curvature is substantially constant or continuously changed in the circumferential direction from each sliding contact range to the recessed portion. Seal structure.

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