JP5195141B2 - Air passage opening and closing device - Google Patents

Description

  The present invention relates to an air passage opening and closing device that opens and closes an opening of an air passage by a slide door, and is suitable for use in a vehicle air conditioner.

Conventionally, this type of air passage switching device is disclosed in Patent Document 1 below. In this prior art, the intermediate shaft is moved and the film door is pressed against the opening to ensure good sealing performance.
JP-A-9-150618

  However, the above structure has a problem that the number of parts is increased, the assembly is complicated, and the cost is increased. Therefore, the present inventor has conducted a trial production to solve this problem. FIG. 9 is an enlarged schematic view of the main part of the indoor unit showing problems during development. Note that the reference numerals not shown in FIG. 9 correspond to the reference numerals in the embodiments of the present invention described later, so refer to the embodiments described later.

  The air passage opening / closing device includes a case 11 that forms an opening 36 of the air passage. Further, it has a plate-like portion 55 that is formed of a resin and has flexibility, and is arranged in the case 11 so as to be slidable in the length direction of the plate-like portion 55, and is opened by sliding. A slide door 54 for opening and closing the portion 36 is provided.

  Further, the case-side sealing surface 37 which is formed to be curved toward the leeward side in the ventilation direction at both edges in the width direction W of the plate-like portion 55 of the opening 36 and the plate surface on the leeward side of the plate-like portion 55 contacts. And a windward side wall portion 57a formed in the case 11 so as to extend in the sliding direction X of the plate-like portion 55 so as to face the case-side seal surface 37 on the windward side of the plate-like portion 55. Yes. The case-side sealing surface 37 and the windward side wall portion 57a form a guide groove 57 that guides the sliding of the plate-like portion 55.

  Further, at both edge portions in the width direction W of the windward side plate surface of the plate-like portion 55, the plate-like portion 55 and the resin are integrated with each other so as to protrude toward the windward side and extend parallel to the sliding direction X. It has a molded driven gear 56a and a driving gear 56b that is disposed on the windward side of the driven gear 56a and meshes with the driven gear 56a. And the gear mechanism 56 which drives the slide door 54 by the driven side gear 56a and the drive side gear 56b is comprised.

  Further, in the sliding direction X, the curvature of the sliding door 54 (plate-like portion 55) is made different from the curvature of the guide groove 57 to suppress vibrations at both ends in the sliding direction of the sliding door 54. I am doing so. The sealing method between the case-side sealing surface 37 and the slide door 54 is a wind pressure seal.

  However, when no wind pressure is applied, a gap S is formed between the case-side sealing surface 37 and the slide door 54. Therefore, when sealing by the wind pressure is started, the slide door 54 is bent by the wind pressure and the gap S disappears. Until then, it was found that there was a problem of wind leakage. In FIG. 9, the gap S is shown large for easy understanding, but in reality, the clearance is necessary for the sliding door 54 to slide smoothly in the guide groove 57.

  The present invention has been made paying attention to such a problem, and an object of the present invention is to provide an air passage switching device capable of ensuring good sealing performance from the start of application of wind pressure.

In order to achieve the above object, the present invention employs the following technical means. That is, according to the first aspect of the present invention, the case (11) that forms the opening portions (35, 36) of the air passage and the plate-shaped portion (55) that is formed of a resin into a plate shape and has flexibility. A sliding door (54) which is disposed in the case (11) so as to be slidable in the length direction of the plate-like portion (55), and which opens and closes the openings (35, 36); Of the plate-like portion (55) in the width direction (W) of the plate-like portion (35, 36). The case-side sealing surface (37) in contact with the case-side sealing surface (37) on the windward side of the plate-like portion (55) and extending in the sliding direction (X) of the plate-like portion (55). A windward side wall portion (57a) formed on the case (11), and a case side seal surface (37) and a windward side wall portion ( 7a), the guide groove (57) for guiding the sliding of the plate-like portion (55), and the windward side at both edges in the width direction (W) of the plate-side portion of the plate-like portion (55) in the width direction (W). To the windward side of the driven gear (56a) and the driven gear (56a) integrally formed with the plate-like portion (55) and the resin so as to extend in parallel with the sliding direction (X). A gear mechanism (56) that has a drive side gear (56b) that is disposed and meshes with the driven side gear (56a), and that drives the slide door (54) with the driven side gear (56a) and the drive side gear (56b). In the air passage opening and closing apparatus provided with the above, the contact surface with which the tip of the sliding door (54) in the sliding direction (X) contacts at the position where the sliding door (54) closes the opening (35, 36) (58) is provided at the end of the guide groove (57) and the opening A drive-side gear (56b) disposed on the other end of the abutment surface (58) against (35, 36), with respect to the curvature of the case-side sealing surface of the guide groove (57) (37), the sliding door The plate-like portion (55) of (54) has a large curvature. At the time of assembly, the slide door (54) bends by fitting into the guide groove (57), and the slide door (54) opens ( If closing the 35, 36), a slide door (54) is over there push the sliding direction (X) the sliding door (54) by a gear mechanism from contact (56) to the abutment surface (58) As a result, the sliding door (54) bends to the leeward side in the clearance with the guide groove (57) and comes into close contact with the case-side sealing surface (37) formed by bending to the leeward side. It is characterized by holding.

  According to the first aspect of the present invention, when the opening portions (35, 36) are closed by the slide door (54), the tip end portion in the sliding direction (X) of the slide door (54) is the contact surface ( 58) in a state where it is only lightly abutted against the guide groove (57), the difference in curvature between the case-side sealing surface (37) and the slide door (54), or the distortion of the slide door (54). A gap (S) is generated due to the above.

However, by further driving the drive side gear (56b) from there and pushing the slide door (54) in the sliding direction (X), the curved slide door (54) bends to the leeward side and the clearance (S ) And close contact with the case-side sealing surface (37). By maintaining this state, it is possible to always ensure good sealing performance from the time of closing regardless of the presence or absence of wind pressure. Further, since the slide door (54) is curved and held in close contact with the case-side seal surface (37), the slide door (54) is strong against vibrations, and even when subjected to vibrations, vibration noise may be generated. Absent. In addition, the curvature of the plate-like portion (55) of the slide door (54) is larger than the curvature of the case-side sealing surface (37) of the guide groove (57), and the slide door (54) is assembled when assembled. Is characterized by being bent by being fitted into the guide groove (57). According to the present invention, the plate-like portion (55) always comes into contact with the guide groove (57) at three points, ie, both ends in the sliding direction and the central portion thereof, so that the slide door (54) Even in the middle position of opening and closing, the vibration of the slide door (54) can be suppressed.

  According to the second aspect of the present invention, in the air passage opening and closing device according to the first aspect, after the sliding door (54) contacts the contact surface (58), the gear mechanism (56) 54) is pushed by a predetermined pushing amount. According to the second aspect of the present invention, the pushing amount (pushing dimension) is determined so that the sliding door (54) is curved and is in close contact with the case-side sealing surface (37), and this is set as a predetermined pushing amount. You may make it control.

  According to a third aspect of the present invention, in the air passage opening and closing device according to the first aspect, after the sliding door (54) contacts the contact surface (58), the gear mechanism (56) 54) with a predetermined pushing force. According to the third aspect of the present invention, the pushing force (pushing torque) is determined so that the sliding door (54) bends and comes into close contact with the case-side sealing surface (37), and this is used as the predetermined pushing force. You may make it control.

  According to a fourth aspect of the present invention, in the air passage opening and closing device according to any one of the first to third aspects, the contact surface (58) is formed at an acute angle with respect to the case-side sealing surface (37). It is characterized by being. According to the fourth aspect of the present invention, by pushing the slide door (54) in the sliding direction (X), the distal end side of the slide door (54) can be brought closer to the case side seal surface (37) side. it can.

  According to a fifth aspect of the present invention, in the air passage opening and closing device according to any one of the first to fourth aspects, at the position where the slide door (54) closes the opening (35, 36), the plate-like portion The groove (M) into which the tip end enters is formed in the case (11) in the vicinity of the contact surface (58) in a state in which (55) is in close contact with the case side seal surface (37). . According to the fifth aspect of the present invention, the state in which the distal end side of the slide door (54) is in close contact with the case side seal surface (37) side can be held by the groove (M).

  In addition, the code | symbol in the parenthesis as described in a claim and said each means is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. In this embodiment, the air passage opening and closing device of the present invention is applied to a vehicle air conditioner. FIG. 1 is a cross-sectional view of an indoor unit 10 of a vehicle air conditioner according to the present embodiment as viewed from the left-right direction of the vehicle, and FIG. 2 is a partial cross-sectional view as viewed from the direction of arrow A in FIG. In addition, each direction in a vehicle mounting state is shown by the up, down, front, back, left, and right arrows in the figure.

  The indoor unit 10 is disposed at a substantially central portion in the vehicle left-right direction (vehicle width direction) at the inner back of the instrument panel at the foremost part of the vehicle interior. The indoor unit 10 includes an air-conditioning casing (case referred to in the present invention) 11 that forms an outer shell and forms an air passage for air-conditioning air blown toward the vehicle interior. The air conditioning casing 11 is formed of a resin (for example, polypropylene) having a certain degree of elasticity and excellent in strength.

  Furthermore, the air-conditioning casing 11 has a dividing surface B (see FIG. 3) that runs in the vehicle vertical direction at a substantially central portion in the vehicle left-right direction, and can be divided into two casing parts on the left and right by this dividing surface. The two right and left casing parts are integrally coupled by fastening means such as a metal spring, a clip, and a screw in a state where respective components such as an air filter 14, an evaporator 13 and a heater core 15 described later are accommodated therein. Has been.

  As shown in FIG. 1, inside air (vehicle compartment air) and outside air (vehicle compartment outside air) are on the vehicle front side and upper side of the air conditioning casing 11 and in the most upstream portion of the air passage formed in the air conditioning casing 11. An inside / outside air switching unit 12 is provided for switching between and. The inside / outside air switching unit 12 is formed with an inside air introduction port 11 a for introducing inside air into the air conditioning casing 11 and an outside air introduction port 11 b for introducing outside air.

  Inside the inside / outside air switching unit 12, an inside / outside air switching door 12a that switches between opening and closing the inside air introduction port 11a and the outside air introduction port 11b is rotatably arranged. Specifically, the inside / outside air switching door 12a is a so-called cantilever door in which a rotating shaft 12c extending in the vehicle left-right direction is integrally coupled to one end side of a plate-like substrate portion 12b.

  In the inside / outside air switching unit 12, the opening ratio between the inside air introduction port 11a and the outside air introduction port 11b is continuously changed by rotating the rotating shaft 12c by an actuator such as a servo motor (not shown) and rotating the substrate portion 12b. Can be varied. An evaporator 13 is disposed on the downstream side of the air flow of the inside / outside air switching unit 12.

  The evaporator 13 is one of the devices constituting a well-known vapor compression refrigeration cycle (not shown), and cools the air-conditioning air by evaporating the low-pressure refrigerant in the refrigeration cycle and exerting an endothermic effect. Heat exchanger. The evaporator 13 is configured by disposing tank portions 13b at both ends in the vertical direction of a core portion 13a made of a plurality of tubes and heat exchange fins, and has a flat shape as a whole. Moreover, the evaporator 13 is arrange | positioned with the flat ventilation surface facing the vehicle front-back direction.

  The plurality of tubes of the evaporator 13 are arranged in parallel in the left-right direction and each flow a refrigerant, and the heat exchange fins promote heat exchange between the refrigerant in the tube and the air-conditioning air outside the tube. is there. The tank portion 13b is arranged above and below the plurality of tubes, distributes the refrigerant to the plurality of tubes, and collects the refrigerant from the plurality of tubes. And the evaporator 13 is supported by the air-conditioning casing 11 by the upper and lower tank parts 13b.

  In the air conditioning casing 11, a thin plate-like air filter 14 is disposed on the air upstream side of the evaporator 13. The air filter 14 removes dust and the like from the air flowing into the evaporator 13. A heater core 15 is disposed on the downstream side and the upper side of the evaporator 13 on the downstream side of the air flow. The heater core 15 causes high-temperature engine cooling water circulating in an engine cooling water circuit (not shown) to flow into the inside, heat-exchanges the engine cooling water and the cold air cooled by the evaporator 13, and reheats the cold air. It is a heat exchanger for heating.

  Like the evaporator 13, the heater core 15 is configured by disposing the tank portion 15b on the upper and lower ends of the core portion 15a including a plurality of tubes and heat exchange fins, and has a flat shape as a whole. The heater core 15 is disposed substantially in parallel with the evaporator 13. In this embodiment, the flat surface of the heater core 15 is inclined at a predetermined angle (about 10 degrees) with respect to the flat surface of the evaporator 13. The heater core 15 is arranged so that the upper end portion of 15 is located slightly on the vehicle front side with respect to the lower end portion.

  The plurality of tubes of the heater core 15 are arranged substantially in parallel in the vertical direction along the inclination angle of the heater core 15. The upper tank portion 15b distributes engine cooling water to the plurality of tubes, and the lower tank portion 15b collects engine cooling water from the plurality of tubes. The heater core 15 is supported on the air conditioning casing 11 by both upper and lower tank portions 15b.

  Next, a bypass passage 16 is formed on the rear side of the evaporator 13 and on the lower side of the heater core 15. The bypass passage 16 is a passage through which the cool air that has passed through the evaporator 13 flows around the heater core 15. Further, immediately after the evaporator 13, an air mix door 50 that adjusts the air volume ratio between the cool air flowing into the heater core 15 and the cool air flowing into the bypass passage 16 is disposed.

  The air mix door 50 is formed in a plate shape with resin and has flexibility, and a plate-like portion 51 that extends in the vertical direction while curving in an arc shape on the rear side of the vehicle, and the plate-like portion 51 on the vehicle upper and lower sides. It comprises a sliding door having a gear mechanism 52 for driving displacement in the direction. By sliding (sliding) the plate-like portion 51 of the air mix door 50 upward in the vehicle, the passage opening on the bypass passage 16 side is increased and the passage opening on the heater core 15 side is decreased.

  Conversely, by sliding (sliding) the plate-like portion 51 downward in the vehicle, the passage opening on the bypass passage 16 side is decreased and the passage opening on the heater core 15 side is increased. By adjusting the opening degree of the air mix door 50, the air volume ratio of cold air and hot air sucked into the blower 20 described later is adjusted, and the temperature of the air-conditioning air blown from the blower 20 toward the vehicle interior is adjusted. The That is, the air mix door 50 constitutes temperature adjusting means for air-conditioning air.

  The gear mechanism 52 includes a rack 52a provided on the plate-like portion 51 so as to extend in the sliding direction of the plate-like portion 51, and a pinion 52b that meshes with the rack 52a. The pinion 52b is driven by an actuator such as a servo motor (not shown). In the present embodiment, the rack 52 a and the pinion 52 b are arranged on the windward side of the plate-like portion 51.

  Further, the rack 52a and the pinion 52b are arranged in the vicinity of both end portions in the width direction of the plate-like portion 51. More specifically, the rack 52a and the pinion 52b are arranged slightly inward in the width direction from both ends in the width direction of the plate-like portion 51. The air conditioning casing 11 is formed with a guide groove 53 that guides the sliding of the plate-like portion 51. The guide grooves 53 are disposed on both sides of the plate-like portion 51 in the width direction.

  The guide groove 53 includes an upwind side wall 53 a extending in the sliding direction of the plate-like part 51 on the windward side of the plate-like part 51, and an upwind side wall part 53 a on the leeward side of the plate-like part 51. It has the leeward side wall part 53b which opposes. Between the windward side wall portion 53a and the leeward side wall portion 53b, both ends in the width direction of the plate-like portion 51, that is, the portion of the plate-like portion 51 outside in the width direction from the rack 52a is slidably inserted. Accordingly, the sliding of the plate-like portion 51 is guided by the guide groove 53 formed by the windward side wall portion 53a and the leeward side wall portion 53b.

  A blower 20 is disposed below the heater core 15 in the air conditioning casing 11. As shown in FIGS. 1 and 2, the blower 20 includes an electric motor 21, fans 22, 23, and scroll casings 24a, 24b. The electric motor 21 is disposed inside the air conditioning casing 11 at the center in the vehicle left-right direction, and the rotation shaft of the electric motor 21 extends to both sides in the vehicle left-right direction.

  The fans 22 and 23 are centrifugal multiblade fans (sirocco fans), and the fan 22 is fixed to the left end portion of the rotating shaft of the electric motor 21. The fan 22 has a large number of blades arranged around the rotation axis, and as shown in FIG. 2, a fan unit that sucks air and blows it radially outward as indicated by an arrow Ka from the left side in the axial direction. 22a, a fan part 22b that sucks air and blows it radially outward as indicated by an arrow Kb from the axial right side, and a partition wall 22c that partitions the fan parts 22a and 22b.

  Similarly, the fan 23 is fixed to the right end portion of the rotating shaft of the electric motor 21 and has a large number of blades arranged around the rotating shaft. The fan 23 sucks air from the right side in the axial direction to the outside in the radial direction. The fan part 23a which blows off, the fan part 23b which inhales air from the axial direction left side and blows off to radial direction outer side, and the partition wall 23c which partitions off the fan parts 23a and 23b are provided. Thus, the fans 22 and 23 can suck in air from both sides in the rotation axis direction and blow it out radially outward.

  The scroll casing 24a individually accommodates the fan portions 22a and 22b of the fan 22 and forms an outflow air passage through which air flowing out of the fan portions 22a and 22b passes. The scroll casing 24a is formed in a spiral shape in which the cross-sectional area of the outflow air passage gradually expands in the rotation direction of the fan 22, and includes two suction ports provided on both sides of the rotation axis direction. And an air outlet for blowing air blown out from the fan 22 upward.

  Similarly, the scroll casing 24b individually stores the fan portions 23a and 23b of the fan 23 and forms an outflow air passage through which the air flowing out from the fan portions 23a and 23b passes. The scroll casing 24b is formed in a spiral shape in which the cross-sectional area of the outflow air passage gradually expands in the rotation direction of the fan 23, and two suction ports provided on both sides of the rotation axis direction, And an air outlet that blows air blown out from the fan 23 upward.

  As shown in FIG. 1, a curved partition wall 18 is formed inside the air conditioning casing 11 on the vehicle rear side of the heater core 15. The partition wall 18 constitutes a guide wall that guides the warm air blown from the heater core 15 to the blower 20 side. Further, an air passage 40 is provided between the partition wall 18 and the rear wall (outer wall) 30 to guide the blown air blown from the scroll casings 24 a and 24 b to the openings 35 and 36. That is, the openings 35 and 36 are arranged on the top side of the blower 20 in the top-and-bottom direction.

  The opening 36 is a face opening 36 that is provided in a vehicle rear side portion of the upper surface portion of the air conditioning casing 11 and blows out an air flow flowing through the air passage 40 toward the head chest of the front seat occupant in the vehicle interior. The opening 35 is a defroster opening 35 that is disposed on the front side of the vehicle with respect to the opening 36 in the upper surface of the air conditioning casing 11 and blows out the airflow flowing through the air passage 40 toward the inner surface of the vehicle windshield. is there.

  A defroster-face door (sliding door as referred to in the present invention) 54 is disposed inside the openings 35 and 36 in the air conditioning casing 11 as one of the blowout mode doors. The defroster-face door 54 is a sliding door similar to the air mix door 50, is formed in a plate shape with resin, has flexibility, and extends in the vehicle front-rear direction while curving upward in an arc shape. And a gear mechanism 56 that drives and displaces the plate-like portion 55 in the vehicle front-rear direction. By sliding (sliding) the plate-like portion 55 of the defroster-face door 54 forward of the vehicle, the passage opening on the opening 36 side is increased and the passage opening on the opening 35 side is decreased.

  Conversely, by sliding (sliding) the plate-like portion 55 toward the rear of the vehicle, the passage opening on the opening 35 side is increased and the passage opening on the opening 36 side is decreased. As with the gear mechanism 52 of the air mix door 50, the gear mechanism 56 of the defroster-face door 54 includes a rack (driven side gear) 56a and a pinion (drive side gear) according to the present invention which will be described later. Have. The guide groove 57 that guides the sliding of the plate-like portion 55 of the defroster-face door 54 is located on the case-side seal surface 37 located on the leeward side of the plate-like portion 55 and on the windward side of the plate-like portion 55. And a windward side wall portion 57a facing the case-side sealing surface 37.

  As shown in FIG. 1, a rear seat side foot opening 39 is provided in the rear wall 30 of the air conditioning casing 11. The rear seat side foot opening 39 blows out the airflow flowing through the air passage 40 toward the occupant foot of the rear seat. In addition, as shown in FIG. 2, the air conditioning casing 11 is provided with a front seat side foot opening 41. The front seat side foot opening 41 blows out the airflow flowing through the air passage 40 toward the passenger's foot of the front seat. Both these foot openings 39 and 41 are also arranged on the top side in the top-to-bottom direction with respect to the blower 20.

  In the air conditioning casing 11, a foot door 42 is disposed inside the foot openings 39 and 41. The foot door 42 is a so-called butterfly door in which a pivot shaft 42a extending in the vehicle front-rear direction is integrally formed at a substantially central portion of the plate-like substrate portion 42b. Then, the opening ratio of both foot openings 39 and 41 is varied by rotating the rotating shaft 42a by an actuator such as a servo motor (not shown) to rotate and displace the substrate portion 42b.

  Next, the structure of the main part of this embodiment will be described. FIG. 3 is an enlarged perspective view of the main part of the indoor unit 10 showing details of the configuration of the defroster-face door 54, and FIG. 4 is an enlarged schematic view of the main part of the indoor unit in the first embodiment of the present invention. 3 indicates the width direction of the plate-like portion 55 of the defroster-face door 54 (hereinafter referred to as door width direction W), and the X direction indicates the sliding direction of the defroster-face door 54 (hereinafter referred to as “door direction W”). It is referred to as a door sliding direction X). And in this embodiment, the door width direction W is made to correspond with the vehicle left-right direction, and the door sliding direction X is made to correspond substantially with the vehicle front-back direction.

  For convenience of illustration, in FIG. 3, only the right casing portion of the left and right casing portions constituting the air conditioning casing 11 is illustrated. FIG. 4 shows a cross section on the face opening 36 side, but the defroster opening 35 side is not shown because it has the same structure on the defroster opening 35 side. In FIG. 4, the rack 56a of the defroster-face door 54 that meshes with the pinion 56b is omitted.

  A case-side sealing surface 37 extending in the door sliding direction X is formed at both edges in the door width direction W of both openings 35 and 36 in a shape curved toward the leeward side. A case-side seal surface 37 extending in the door width direction W is also formed at both edges of the openings 35 and 36 in the door sliding direction X. When the defroster-face door 54 closes the defroster opening 35 or the face opening 36, the plate surface on the leeward side (the upper side in FIG. 4) of the plate-like portion 55 comes into contact with the case-side seal surface 37. It is designed to exhibit sealing properties.

  A seal member made of urethane foam or the like is attached to the leeward plate surface of the plate-like portion 55, and the leeward plate surface is brought into contact with the case-side seal surface 37 via the seal member. Also good. The gear mechanism 56 that drives the defroster-face door 54 includes a resin rack 56a that is integrally formed with the plate-like portion 55, and a circular pinion 56b that meshes with the rack 56a.

  The rack 56a faces toward the opposite side of the plate surface on the leeward side (lower side in FIG. 4) from both edges in the door width direction W among the plate surface on the windward side (lower side in FIG. 4) of the plate-like portion 55. And extends parallel to the door sliding direction X. The pinion 56b has a drive shaft 56c extending in the door width direction W, and both ends of the drive shaft 56c are rotatably supported by bearing holes (not shown) in the side wall portion of the air conditioning casing 11.

  One end of the drive shaft 56c is coupled to a door drive device such as a servo motor (not shown). In the present embodiment, the pinion 56b and the drive shaft 56c are integrally formed of resin. A windward side wall 57 a that faces the case-side sealing surface 37 is formed on the side wall of the air conditioning casing 11. Between the windward side wall portion 57a and the case-side seal surface 37, both ends of the plate-like portion 55 in the door width direction W are slidably supported.

  In other words, the windward side wall 57 a and the case-side seal surface 37 form a guide groove 57 that guides sliding of the defroster-face door 54. It should be noted that the curvature of the plate-like portion 55 of the defroster-face door 54 is made different (large in this embodiment) from the curvature of the guide groove 57 (case-side seal surface 37). Further, at each position where the defroster face door 54 closes the defroster opening 35 and the face opening 36, the contact surface 58 with which both ends of the defroster face door 54 in the door sliding direction X abut is guided. They are provided at the ends of the grooves 57 (only the face opening 36 side is shown in FIG. 4).

  When the defroster opening 35 and the face opening 36 are closed by the defroster-face door 54, the defroster-face door 54 comes into contact with the contact surface 58 on each side (in the broken line state in FIG. 4). Also, when the defroster-face door 54 is pushed in the door sliding direction X by the gear mechanism 56, the defroster-face door 54 is bent in the clearance with the guide groove 57 and is in close contact with the case-side seal surface 37. (The state of the solid line in FIG. 4). This state is maintained.

  FIG. 5 is a diagram for explaining a precondition for calculating the pushing amount at this time. The length of the defroster-face door 54 in the sliding direction is L, and the radius of the case-side seal surface 37 is R. In addition, the defroster-face door 54 is bent by fitting into the guide groove 57 at the time of assembly, and the length of the door sliding direction X is shortened. However, the defroster-face door 54 in the door sliding direction X at the time of assembly is reduced. The indentation amount is calculated so that the length can be approximated to L. The curvature of the case-side sealing surface 37 is also constant R.

When the tip of the straight defroster face door 54 (broken line in FIG. 5) is in contact with the contact surface 58, θ is the half of the angle occupied by the contacts a and b with respect to the case.
(Equation 1) Sinθ = (L / 2) / R
(Equation 2) θ = Sin−1 (L / 2R)
(Equation 3) arc of ab = R × 2θ = 2RSin−1 (L / 2R)
(Equation 4) Therefore, the pushing amount is 2RSin−1 (L / 2R) −L. In addition, since the basic structure of the air mix door 50 is the same as that of the above-mentioned defroster-face door 54, description of the details of the structure of the air mix door 50 is omitted.

  Next, the operation of the indoor unit 10 of the present embodiment will be described. First, the electric motor 21 of the blower 20 drives the fans 22 and 23 to rotate. Then, the fan 22 draws in air from both inlets of the scroll casing 24a and blows it out from the outlet of the scroll casing 24a. The fan 23 sucks air from both suction ports of the scroll casing 24b and blows it out from the outlet of the scroll casing 24b.

  By such an operation of the blower 20, air is introduced into the air conditioning casing 11 through at least one of the inside air introduction port 11a and the outside air introduction port 11b. The air-conditioning air introduced from the one introduction port passes through the air filter 14 and flows into the evaporator 13. This air-conditioning air is heat-exchanged with the refrigerant when passing through the evaporator 13 and is cooled to become cold air.

  Here, when the air mix door 50 is in a state of opening the air inlet side of the bypass passage 16 and the air inlet side of the heater core 15, a part of the cold air blown out from the evaporator 13 is used. The cold air flows into the heater core 15 and is heated by the heater core 15. For this reason, it is blown out from the heater core 15 as warm air. The warm air is guided to the blower 20 side by the partition wall 18 and flows as indicated by an arrow ra in FIG.

  Of the cold air blown from the evaporator 13, the remaining cold air passes through the bypass passage 16 and flows as indicated by an arrow rb in FIG. Accordingly, the cool air that has passed through the bypass passage 16 and the warm air that is blown out from the heater core 15 flow toward both the suction ports of the scroll casings 24a and 24b. Before being sucked into these suction ports, the cold air and the hot air collide at an angle of about 90 degrees.

  Thus, the cold air and the hot air that collide before being sucked into the scroll casings 24a and 24b are sucked by the operation of the fans 22 and 23 and blown out in the radial direction. Thereby, the collided cold air and hot air are mixed and blown out in the radial direction as conditioned air. Thereafter, the conditioned air passes through the scroll casings 24a and 24b and is blown out to the air passage 40, and passes through the air passage 40 to pass through the defroster opening 35, the face opening 36, and the foot openings 39 and 41. It is blown out toward the passenger compartment.

  Next, the features and effects of this embodiment will be described. First, at the position where the defroster-face door 54 closes the defroster opening 35 or the face opening 36, the contact surface 58 with which the tip of the defroster-face door 54 in the door sliding direction X comes into contact is the end of the guide groove 57. Provided in the department. When the defroster opening 35 or the face opening 36 is closed by the defroster face door 54, the defroster face door 54 is slid by the gear mechanism 56 even after the defroster face door 54 contacts the contact surface 58. It pushes in the moving direction X, and keeps the state.

  According to this, when closing the defroster opening 35 or the face opening 36 with the defroster-face door 54, the front end portion of the defroster-face door 54 in the door sliding direction X is only slightly in contact with the contact surface 58. In this state, a clearance S (see FIG. 9) is generated in the clearance from the guide groove 57 due to a difference in curvature between the case-side seal surface 37 and the defroster-face door 54, distortion of the defroster-face door 54, and the like. Yes.

  However, by further driving the pinion 56b from there and pushing the defroster-face door 54 in the door sliding direction X, the curved defroster-face door 54 bends to the leeward side, filling the gap S and sealing the case side. Close contact with the surface 37. By maintaining this state, it is possible to always ensure good sealing performance from the time of closing regardless of the presence or absence of wind pressure. Further, since the defroster face door 54 is curved and held in close contact with the case-side seal surface 37, the defroster face door 54 is strong against vibration, and no vibration noise is generated even when the vibration is received.

  Further, after the defroster face door 54 comes into contact with the contact surface 58, the gear mechanism 56 pushes the defroster face door 54 by a predetermined pushing amount. According to this, the pushing amount (pushing dimension) sufficient for the defroster-face door 54 to be bent and be in close contact with the case-side seal surface 37 may be determined and controlled as a predetermined pushing amount.

  Further, after the defroster face door 54 comes into contact with the contact surface 58, the gear mechanism 56 pushes the defroster face door 54 with a predetermined pushing force. According to this, the pushing force (pushing torque) that the defroster face door 54 bends and closely contacts the case-side sealing surface 37 may be determined and controlled as a predetermined pushing force.

  Further, in the door sliding direction X, the curvature of the plate-like portion 55 is made different from the curvature of the guide groove 57. According to this, the plate-like portion 55 always comes into contact with the guide groove 57 at three points, that is, both end portions in the sliding direction and the central portion thereof, so that the defroster-face door 54 is at an intermediate position for opening and closing. Even if it exists, the vibration of the defroster face door 54 can be suppressed.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. FIG. 6 is an enlarged schematic view of the main part of the indoor unit in the second embodiment of the present invention. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described. In the present embodiment, the contact surface 58 is formed at an acute angle with respect to the case-side seal surface 37. According to this, by pushing the defroster-face door 54 in the door sliding direction X, the front end side of the defroster-face door 54 can be brought closer to the case-side seal surface 37 side.

(Third embodiment)
Next, a third embodiment of the present invention will be described. FIG. 7 is an enlarged schematic view of the main part of the indoor unit in the third embodiment of the present invention. A different characteristic part from each embodiment mentioned above is demonstrated. In the present embodiment, in the position where the defroster-face door 54 closes the defroster opening 35 or the face opening 36, the groove M into which the tip side enters in the state where the plate-like portion 55 is in close contact with the case-side seal surface 37, It is formed in the air conditioning casing 11 in the vicinity of the contact surface 58. According to this, the state where the front end side of the defroster-face door 54 is in close contact with the case-side seal surface 37 side can be held by the groove M.

(Other embodiments)
The present invention is not limited to the above-described embodiments, and can be modified or expanded as follows. FIG. 8 is an enlarged schematic view of a main part of an indoor unit according to another embodiment of the present invention. For example, in each of the above-described embodiments, the tip of the defroster-face door 54 in the door sliding direction X is provided at the end of the guide groove 57 and is brought into contact with the contact surface 58. Further, an elastic body 59 such as rubber is provided on the case-side sealing surface 37, and when the tip of the defroster face door 54 in the door sliding direction X slides on the elastic body 59, the door is bent by a frictional force. good.

  In the above-described embodiment, the curvature of the case-side seal surface 37 is constant R, but the curvature may vary depending on the portion. By pushing in after the door front end of the present invention is brought into contact, adhesion is also made following the sealing surface where the curvature is changed.

It is sectional drawing of the indoor unit 10 of the vehicle air conditioner which concerns on embodiment of this invention. It is the fragmentary sectional view of the indoor unit 10 seen from the A arrow direction in FIG. It is a principal part expansion perspective view of an indoor unit. It is a principal part expansion schematic diagram of the indoor unit in 1st Embodiment of this invention. It is a figure explaining the precondition of pushing amount calculation. It is a principal part expansion schematic diagram of the indoor unit in 2nd Embodiment of this invention. It is a principal part expansion schematic diagram of the indoor unit in 3rd Embodiment of this invention. It is a principal part expansion schematic diagram of the indoor unit in other embodiment of this invention. It is a principal part expansion schematic diagram of the indoor unit which shows the problem in the middle of development.

Explanation of symbols

11 ... Air-conditioning casing (case)
35 ... Defroster opening (opening)
36 ... Face opening (opening)
37 ... Case side sealing surface 54 ... Defroster face door (sliding door)
55 ... Plate-like part 56 ... Gear mechanism 56a ... Rack (driven gear)
56b ... pinion (drive side gear)
57 ... Guide groove 57a ... Upward side wall 58 ... Abutting surface M ... Groove W ... Width direction X ... Sliding direction

Claims (5)

A case (11) forming an opening (35, 36) of the air passage;
It has a plate-like portion (55) which is made of resin and has flexibility, and is arranged in the case (11) so as to be slidable in the length direction of the plate-like portion (55). A sliding door (54) for opening and closing the opening (35, 36) by the sliding;
Of the openings (35, 36), the both ends in the width direction (W) of the plate-like portion (55) are formed to bend toward the leeward side in the ventilation direction, and the leeward side of the plate-like portion (55). The case-side seal surface (37) with which the plate surface abuts, and the plate-like portion (55) slides facing the case-side seal surface (37) on the windward side of the plate-like portion (55). A windward side wall portion (57a) formed on the case (11) so as to extend in the direction (X), and the case-side sealing surface (37) and the windward side wall portion (57a) A guide groove (57) for guiding the sliding of the shaped part (55);
Of the plate surface on the windward side of the plate-like portion (55), both edges in the width direction (W) protrude toward the windward side and extend parallel to the sliding direction (X). A driven gear (56a) integrally molded with the plate-shaped portion (55) and resin, and a driving gear (56b) arranged on the windward side of the driven gear (56a) and meshing with the driven gear (56a). And a gear mechanism (56) for driving the sliding door (54) with the driven gear (56a) and the driving gear (56b),
At the position where the sliding door (54) closes the opening (35, 36), the guide surface is contacted with the contact surface (58) with which the tip of the sliding door (54) contacts in the sliding direction (X). Provided at the end of the groove (57), the drive side gear (56b) is disposed on the other end side of the contact surface (58) with respect to the opening (35, 36),
The curvature of the plate-like portion (55) of the slide door (54) is larger than the curvature of the case-side sealing surface (37) of the guide groove (57), and the slide door is assembled when assembled. (54) is bent by fitting in the guide groove (57),
When the opening portions (35, 36) are closed by the slide door (54), the slide mechanism (56) is used by the gear mechanism (56) even after the slide door (54) contacts the contact surface (58). the press write Mukoto (54) in said sliding direction (X), said sliding door (54) is deflected to the leeward side in the clearance between the guide groove (57), formed curved downwind side An air passage opening and closing device characterized by being in close contact with the case-side sealing surface (37) and maintaining this state.   The gear mechanism (56) pushes the slide door (54) by a predetermined push amount after the slide door (54) comes into contact with the abutment surface (58). Air passage opening and closing device.   The gear mechanism (56) pushes the slide door (54) with a predetermined pushing force after the slide door (54) comes into contact with the abutment surface (58). Air passage opening and closing device.   The air passage opening and closing device according to any one of claims 1 to 3, wherein the contact surface (58) is formed at an acute angle with respect to the case-side seal surface (37).   In the position where the sliding door (54) closes the opening (35, 36), the plate-like portion (55) is in a state where the front end side enters (M) while the plate-like portion (55) is in close contact with the case-side sealing surface (37). 5) is formed in the case (11) in the vicinity of the contact surface (58).

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