JPH07205638A - Air passage switching device - Google Patents

Abstract

PURPOSE:To prevent such a troublesome situation that frictional sound offends ears following movement of a film member while retaining seal performance and suppressing increment of a cost. CONSTITUTION:A frame section 19 is integrally formed at the periphery of a face spit hole and a foot spit hole which are formed in such a condition that they are mutually adjacent to an air duct 2, and the tip end of the frame section 19 is formed as a seal face section 19a which is slidably connected with a film damper 17. For example, three ribs 20 which are directed in the moving direction of the film damper 17 are integrally formed in the face spit hole and the foot spit hole. In this case, each rib 20 is arranged in such a way that a gap 21 having a predetermined dimension delta is left between each rib 20 and a virtual face including the seal face section 19a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air passage switching device which adjusts the opening degree of an air passage portion by using a film-like member having a ventilation opening.

[0002]

2. Description of the Related Art In recent air conditioners for vehicles, an outlet switching damper, an air mix damper, etc. are constructed as a film damper using a film damper made of a flexible material such as a plastic film. By doing so, it is considered that the structure is simplified and the overall weight and size are reduced.

That is, for example, a film damper used for an outlet switching damper is provided on the upstream side of the outlet so as to be capable of reciprocating at a position along the outlet.
According to the movement, the relative position of the ventilation opening of itself and the blowout port is changed to adjust the opening degree of the blowout port. In this case, a seal surface portion with which the film damper is slidably contacted is provided at the peripheral portion of the air outlet, and in the operating state of the air conditioner, the film damper is brought into close contact with the seal surface portion by the wind pressure acting on the film damper to obtain sealing performance. I am trying.

Further, in the operating condition of the air conditioner, when the wind pressure acting on the film damper becomes relatively larger than its rigidity, the entire film damper is deformed so as to bulge to the downstream side, and the sealing surface portion. Since there is a possibility that the adhesion with the film, that is, the sealing property may be deteriorated, a rib that comes into contact with the film damper is provided in the air outlet to prevent its deformation.

[0005]

In the above conventional structure, the film damper and the rib are provided in a positional relationship in which they are always in contact with each other. Therefore, when the film damper moves, a frictional noise with the rib is always generated. In this case, when the wind pressure acting on the film damper is relatively large, that is, when the amount of air blown by the air conditioning operation is relatively large, the blowing noise becomes relatively louder than the above-mentioned friction noise, and therefore the friction noise is generated. Although it does not cause annoyance to the ears, the fricative noise is annoying when the amount of air blown by the air conditioning operation is small, that is, when the background noise due to the air blow operation is low.

The present invention has been made in view of the above circumstances. An object of the present invention is to secure a sealing property of a film-shaped member while preventing a frictional noise caused by the movement of the film-shaped member from being offensive to the ear. An object of the present invention is to provide an air passage switching device capable of preventing an increase in cost while suppressing it.

[0007]

In order to achieve the above object, the present invention moves a flexible film-like member having a ventilation opening so as to face an air passage portion formed in an air duct. In the air passage switching device for arranging the air passage portion and changing the relative position between the air passage portion and the ventilation opening according to the movement of the film member, A seal surface portion formed so that the film member slides in contact with the peripheral portion of the air passage portion from the upstream side of the air duct, and a surface including the seal surface portion at the downstream side position of the film member in the air passage portion. And a rib arranged so that there is a gap of a predetermined size between the rib and the rib (claim 1).

In this case, the rib may be provided at a portion facing the film member with friction reducing means for exhibiting a friction reducing effect in a state of being in contact with the film member (claim 2). ).

Further, the friction reducing means may be composed of a tapered ridge formed in a portion of the rib facing the film-like member (claim 3).

[0010]

In the air passage switching device according to the present invention, when the film member is moved, the relative position between the air passage portion and the ventilation opening of the film member is changed accordingly. As a result, the opening degree of the air passage portion is adjusted. In this case, since the film-shaped member slides from the upstream side of the air duct with respect to the seal surface portion formed on the peripheral edge of the air passage portion, when the air is flowing in the air duct, The film-shaped member is brought into close contact with the sealing surface portion by the wind pressure acting on the film-shaped member, whereby good sealing performance can be obtained.

A rib is provided at a position on the downstream side of the film-shaped member in the air passage portion.
Arrangement such that there is a gap of a predetermined dimension between the surface including the seal surface portion, that is, an arrangement that is located on the downstream side by a predetermined dimension from the seal surface portion that has the function of defining the movement trajectory of the membrane member. Therefore, when the wind pressure acting on the film-shaped member is zero or relatively small, that is, when the film-shaped member does not deform so as to bulge downstream,
The film-shaped member does not come into sliding contact with the rib. Therefore, in such a state, only the frictional noise accompanying the movement of the film-shaped member is generated in the sliding contact portion with the seal surface portion, and the annoying frictional noise is suppressed to the minimum.

The wind pressure acting on the membrane member becomes large,
When the film-shaped member is deformed so as to bulge to the downstream side, it comes into contact with the rib, but the amount of deformation of the film-shaped member at this time is suppressed to an amount equal to or less than the set size of the gap. Will be done. Therefore, even in the case of such a deformation, there is no possibility that the sliding contact state between the film-shaped member and the seal surface portion is adversely affected, and thus the deterioration of the sealing property can be prevented in advance. At this time, a frictional noise is generated between the film member and the ribs, but when the air pressure acting on the film member increases as the amount of air blown in the air duct increases, the air blown Since the background noise caused by the noise increases, the possibility that the above-mentioned fricative noise will be offensive to the ear is reduced.

In the air passage switching device according to the present invention, a portion of the rib facing the film member is
Since the friction reducing means that exerts a friction reducing effect in the state of being in contact with the film-like member is provided, the wind pressure acting on the film-like member becomes large and the film-like member comes into contact with the rib. Even in such a case, the generation of the frictional noise is suppressed by the friction reducing effect of the friction reducing means provided on the rib.

In the air passage switching device according to the third aspect of the present invention, the above-mentioned friction reducing effect is obtained by the tapered ridge formed on the surface of the rib facing the film member. Since it is not necessary to separately provide a member that constitutes the friction reducing means, it is possible to prevent an increase in cost as much as possible.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to an automobile air conditioner will be described below with reference to FIGS. In FIG. 4, the air duct 2 of the automobile air conditioner 1
Has an outside air inlet and an inside air inlet not shown on the most upstream side, and has a defroster outlet 3, a face outlet 4, and a foot outlet 5 vertically on the most downstream side. Each of the outlets 3 to 5 corresponds to the air passage portion of the present invention, the defroster outlet 3 is provided to blow out air toward the inside of the windshield, and the face outlet 4 is provided on the upper body of the occupant. The foot outlet 5 is provided to blow air toward the passenger's feet.

Inside the air duct 2, from the upstream side to the downstream side, there are provided an inside / outside air switching damper (not shown) as an introduced air switching means for selecting the inside air intake mode or the outside air intake mode, the outside air introduction port or the inside air introduction port. A blower (or a fan) (not shown) as an air blower for blowing the air sucked in through the downstream side, an evaporator 6 as a cooling means, and a heater core 7 as a heating means through which engine cooling water flows, for example. There is. A sleeve wall portion 8 formed integrally with the air duct 2 is provided above the heater core 7 in the air duct 2, and the sleeve wall portion 8 is provided with cold air that has exchanged heat with the evaporator 6 in the heater core 7. Means for forming an air passage for bypassing and directing the air directly to the face air outlet 4 direction, specifically, a cold air bypass opening 9 is formed. Further, the cold air bypass port 9 is provided with a passage opening / closing means, specifically a plate damper 10, for selectively enabling the cold air bypass function.

The heater core 7 is arranged so that there is a predetermined gap between the lower end of the sleeve wall portion 8 and the lower surface of the air duct 2, whereby the upper and lower portions of the heater core 7 are arranged. The first cold air passage 11 and the second cold air passage 12 are formed. Further, on the downstream side of the heater core 7 in the air duct 2, the downstream side is partitioned into two space portions communicating with the cold air passages 11 and 12, and a guide 13 integral with the air duct 2 is provided in a different passage. It is formed as a means for smoothing the flow of air in. The guide 13 has a shape extending from the downstream side surface of the heater core 7 to a position corresponding to the central portion of the face outlet 4, and mixes air in the first cold air passage 11 and the second cold air passage 12 with each other. A plurality of notch portions (not shown) are formed so as to extend in the longitudinal direction for the purpose of, for example,

At the position adjacent to the edge of the defroster outlet 3 near the sleeve wall 8 in the air duct 2 and the position adjacent to the lower edge of the foot outlet 5, the winding shaft 1 is provided.
4 and 15 are rotatably supported with a predetermined gap between them and the air duct 2. Further, a film damper 17, which will be described later, is provided at each intermediate position between the defroster outlet 3 and the face outlet 4 in the air duct 2.
5 to 5, specifically, a guide member 16 configured in the shape of a shaft having a circular cross section is rotatably supported with a predetermined gap between the guide member 16 and the air duct 2. Although the guide member 16 is rotatable in this embodiment, it may be provided in a fixed state. When the guide member 16 is provided in such a fixed state, at least the surface contacting the film damper 17 is provided. It suffices that the cross-sectional shape is a shape that does not hinder the movement of the film damper 17, for example, a curved shape.

The blower outlet switching film damper 17 corresponding to the flexible film-like member according to the present invention comprises the winding shaft 14,
By being hung between the guide rollers 16 and the air duct 2 in a state of passing through the space between the guide rollers 16 and the air duct 2, the defroster outlet 3, the face outlet 4, and the foot outlet 5 can be moved in a state of facing each other from the upstream side. It is provided. The film damper 17 has winding shafts 14 and 1 at both ends, respectively.
5 and is configured to move according to the rotation of the winding shafts 14 and 15.

As shown in FIG. 5, the film damper 17 has, for example, two sets of four ventilation openings 18 at predetermined positions. Depending on the movement, the defroster outlet 3 and the face outlet are provided. 4 and the foot outlets 5 and the group of the openings 18 are changed to adjust the opening degree of the outlets 3 to 5, that is, the outlet mode. Specifically, depending on the moving position of the film damper 17, a differential mode in which only the defroster outlet 3 is opened, a face / def mode in which the defroster outlet 3 and the face outlet 4 are opened, and only the face outlet 4 is opened. The face mode is changed to the bi-level mode in which the face air outlet 4 and the foot air outlet 5 are opened, and the foot mode in which only the foot air outlet 5 is opened.

In this case, the film damper 17 is made of a material having flexibility and relatively high rigidity and strength, desirably having a small friction coefficient and excellent abrasion resistance and heat resistance. , A laminated film having a cross-sectional shape as shown in FIG. 6, for example.

That is, in FIG. 6, the film damper 17
Adheres the woven cloth layers 17c and 17c to both surfaces of the resin film 17a with the adhesive layer 17b, and at the same time,
Resin coating layers 17d and 17d are formed on the surface of c. In this case, the resin film 17a has a thickness of 25 μm obtained by stretching a resin having excellent mechanical properties and heat resistance, for example, PPS (polyphenylene sulfide) resin in the winding direction.
Use something of a degree. For the adhesive layer 17b, for example, an epoxy (NBR-modified) adhesive having excellent adhesiveness and heat resistance is applied and applied at a rate of about 15 g (dry) / m ² . The woven fabric layer 17c is preferably made of a material having excellent mechanical properties and heat resistance, and particularly having high tear strength. For example, 6.6 nylon is woven into the film damper 17 in a thickness according to a necessary thickness dimension. . Resin coat layer 17d
Is a material having a small friction coefficient, for example, a silicon compound, which is solvent-coated at a rate of 9 g (dry) / m ² and is used.

However, the peripheral surface of each of the defroster outlet 3, the face outlet 4, and the foot outlet 5 is formed with a sealing surface portion with which the film damper 17 is slidably contacted. 4 and the foot outlet 5 will be described as an example. That is, in FIG. 1 and FIG. 2, a frame-shaped portion 19 including the outlets 4 and 5 is integrally formed in the peripheral portion of the face outlet 4 and the foot outlet 5 in the air duct 2 in a state of projecting to the upstream side. The seal surface portion 1 is formed and has a frame-shaped portion 19 whose tip surface is flat.
It is configured to function as 9a. Further, in the face outlet 4 and the foot outlet 5, a plurality of ribs 2, for example, three ribs 2 oriented in the moving direction of the film damper 17 are provided.
0 is integrally formed.

In this case, each rib 20 has a gap 21 with a predetermined dimension δ between itself and the virtual surface including the sealing surface portion 19a.
(See FIG. 1). The dimension δ of the gap 21 is determined in consideration of the arrangement pitches d and d ′ of the ribs 20, the thickness dimension θ of the film damper 17 and its rigidity, and as shown in FIG. Is selected so that the sealability between the film damper 17 and the seal surface portion 19a is not impaired due to the deformation even when is deformed downstream and brought into contact with the rib 20. To be done. For example, d
= D '= 30 mm and θ = 0.2 mm,
δ is set to about 0.5 mm.

Further, each rib 20 has a film damper 17
The protruding portion 20a (which is the rib 20 of the rib 20) functioning as a friction reducing means in the present invention is formed by forming the portion facing to the film damper 17 in the direction of approaching the film damper 17 to have a tapered shape, for example, an arc shape. It will be extended in the directional direction). further,
The ribs 20 are arranged in such a positional relationship as to correspond to the bridge portions (shown by reference numeral A in FIG. 2) between the ventilation openings 18 of the film damper 17, respectively.

Although not shown in detail, as shown in FIG. 4, a frame-shaped portion 22 having the same shape as the frame-shaped portion 19 described above is provided at the peripheral portion of the defroster outlet 3 in the air duct 2.
Is formed, and the front end surface of the frame-shaped portion 22 is configured to function as a flat seal surface portion (no reference numeral) with which the film damper 17 is in sliding contact. Further, three ribs 23 having the same arrangement as the rib 20 are integrally formed in the defroster outlet 3, and the rib 23 also has a ridge portion (similar to the ridge portion 20a). (Unsigned) is provided.

In FIG. 4, a position facing the lower end of the sleeve wall 8 in the air duct 2 and the foot outlet 5 are shown.
The winding shaft 24 is provided at each of the positions facing the lower edge portion from below.
25 is rotatably supported. An air-mix film damper 26 corresponding to a film-shaped member is made of the same material as the film damper 17, and has the winding shaft 24,
It is movably provided at a position across both the first cold air passage 11 and the second cold air passage 12 by being bridged between the 25 while passing through the upstream side of the heater core 7. Both ends of the film damper 26 are connected to the winding shafts 24 and 25, respectively.
Is configured to move according to the rotation of the.

Although not shown, a group of ventilation openings are formed at predetermined positions of the film damper 26, and the groups of openings are formed on the front surface of the heater core 7 and the respective cold air passages 11 according to the movement of the film damper. And 12 to selectively correspond to one or more of them, the ratio of the amount of air blown through the heater core 7 and the amount of air blown through the first and second cool air passages 11 and 12 can be arbitrarily adjusted. Has been done.

Here, one of the winding shafts 14 and 15
In addition, one of the winding shafts 24 and 25 is connected to an output shaft of a step motor (not shown) as a moving unit attached to the outside of the air duct 2. Between the winding shafts 14 and 15 and between the winding shafts 24 and 25, means for transmitting the movement of one winding shaft, such as a belt and a wire, to the other winding shaft is provided. There is. Then, the step motor is rotated by an angle corresponding to the number of drive pulses sent from the control device, and one winding shaft is rotated accordingly, whereby the film dampers 17 and 26 are rotated.
Is designed to move.

In this case, the moving means is not limited to the above step motor, but may be a servo motor, an ultrasonic motor or the like. Further, the mounting positions of these motors are not limited to the outside of the air duct 2, but may be inside thereof or inside the corresponding winding shaft.

A space 27 for introducing air is provided between the upstream side surface of the heater core 7 and the film damper 26. In this space 27, the sealing surface 19a and the rib 20 are provided. When there is a seal surface portion and a rib that perform the same function, the relationship between the rib and the seal surface portion may be set to a state where a gap similar to the above-described gap 21 exists, if necessary. Is.

Next, of the operation of the above configuration, the part related to the gist of the present invention will be described. When the air outlet mode is switched according to the movement of the film damper 17,
The film damper 17 includes a sealing surface portion 19 of the frame-shaped portion 19.
It comes into sliding contact with a and the sealing surface portion of the frame-shaped portion 22.
In this case, since the film damper 17 is in sliding contact with the sealing surface portions of the sealing surface portion 19a and the frame-shaped portion 22 from the upstream side of the air duct 2, the inside of the air duct 2 is operated according to the operation of the blower (not shown). When air flows through the film damper 17, the film damper 17 is brought into close contact with the seal surface portions 19a and the seal surface portions of the frame-shaped portion 22 due to the wind pressure acting on the film damper 17, so that good sealability can be obtained. become.

A rib 20 is provided at a position downstream of the film damper 17 in the face outlet 4 and the foot outlet 5, and a rib 23 is provided at a position downstream of the film damper 17 in the defroster outlet 2. But
The ribs 20 and 23 are arranged such that a gap 21 (a gap on the rib 23 side is not designated) having a predetermined dimension δ exists between the seal surface portion 19a and an imaginary surface including the seal surface portion of the frame-shaped portion 22. That is, the seal surface portion 1 having a function of defining the movement trajectory of the film damper 17
9a and the sealing surface of the frame-shaped portion 22 are arranged on the downstream side by a dimension that can be arbitrarily set. Therefore, when the wind pressure acting on the film damper 17 is zero or relatively small, that is, the film damper 17 The film damper 17 is prevented from slidingly contacting the ribs 20 and 23 in a state where the film damper 17 does not deform so as to bulge downstream. Therefore, in such a state, the film damper 1
Friction noise caused by the movement of 7 is caused by the seal surface portion 19a and the frame portion 2
It is only generated at the sliding contact portion with the second seal surface portion, and it is possible to minimize the jarring friction noise.

When the wind pressure acting on the film damper 17 becomes large and the film damper 17 is deformed so as to expand toward the downstream side, it comes into contact with the ribs 20 or 23. At this time, the film damper 17 The deformation amount of 17 is suppressed to be equal to or less than the amount corresponding to the set dimension δ of the gap 21. Therefore, even in the case of such a deformation, there is no possibility that the sliding contact state between the film damper 17 and the seal surface portion 19a and the seal surface portion of the frame-shaped portion 22 will be adversely affected, thereby preventing the deterioration of the sealability. become able to. Moreover, in order to obtain such an effect, it is only necessary to change the positions of the ribs 20 and 23 that are originally required, so that it is possible to suppress an increase in manufacturing cost.
At this time, a frictional noise is generated between the film damper 17 and the rib 20 or 23, but the wind pressure acting on the film damper 17 increases as the amount of air blown in the air duct 2 increases. Then, since the background noise caused by the blown air becomes large, there is less risk that the fricative noise will be offensive to the ears.

Further, the rib 20 has a ridge portion 20a which functions as a friction reducing means at a portion facing the film damper 17.
Since the ribs 23 are also provided with similar ridges (no reference numeral), the wind pressure acting on the film damper 17 is increased, and the film damper 17 is attached to the ribs 20.
Even in the situation where the ridges come into contact with the film damper 17, the ridges and the film damper 17 come into line-contact with each other, so that the effect of reducing friction is exerted. It will be possible to suppress the generation of fricative noise.

In particular, in this case, the film damper 1 in the ribs 20 and 23 has the above-described friction reducing effect.
7 is obtained by the ridges 20a (and the ridges with no reference numeral) formed on the surface facing the No. 7, it is not necessary to separately provide a member that constitutes the friction reducing means, and the increase in cost is prevented as much as possible. become able to.

Further, in the above embodiment, the ribs 20 and 2 are used.
3 is each ventilation opening 18 in the film damper 17.
Since they are arranged in a positional relationship corresponding to the bridge portion A between them, the edge portion of the ventilation opening 18 does not collide with the rib 20 when the film damper 17 moves, which is caused by such a collision. There is an advantage that noise can be generated.

In the above embodiment, the ribs 20, 2 are
Although a friction reducing means is provided by forming a part of 3 in an arc shape, the entire air duct 2 is made of a resin material having self-lubricating properties (fluorine resin, acetal resin, etc.).
The friction reducing means may be provided at the portions of the ribs 20 and 23 facing the film damper 17 by integrally molding with the ribs 20 and 23. In this case, the ribs 20 and 23 having the shape as in the above embodiment are used together. With this configuration, the effect of preventing the generation of fricative noise can be further enhanced. Moreover, when the entire air duct 2 is integrally molded with a resin material having self-lubricating property in this way, the friction of the seal surface portions 19a and the seal surface portions of the frame-shaped portion 22 is also reduced, so that the friction noise in this portion is reduced. There is an advantage that a reduction effect can be expected.

Further, in the above embodiment, the ribs 20 and 23 are provided.
And the number of bridge portions A between the ventilation openings 18 of the film damper 17 are made equal to each other, the noise caused by the edge portion of the ventilation openings 18 of the film damper 17 hitting the rib 20. Although the effect of preventing the above is obtained, such a configuration may be provided if necessary. That is, for example, as shown in FIG. 7 showing the second embodiment of the present invention, the number of the group of ventilation openings 18 provided in the film damper 17 is reduced to, for example, three, that is, the rib 20 is provided for each ventilation in the film damper 17. A configuration that does not correspond to the bridge portion A between the use openings 18 may be adopted, and in this case, there is an advantage that the degree of freedom in design is increased. Of course, conversely, the same advantages can be obtained by adopting a configuration in which the number of ventilation openings 18 in a group is increased or by increasing or decreasing the number of ribs 20 and 23 installed.

FIG. 8 shows a third embodiment of the present invention, and only the parts different from the first embodiment will be described below. That is, this embodiment is referred to in the present invention by forming the portion of the rib 20 facing the film damper 17 into a pointed shape that linearly tapers in the direction of approaching the film damper 17. The structure is characterized in that it includes the protruding portion 20b that functions as a friction reducing means. According to this structure, when the film damper 17 contacts the rib 20, the friction between the two is further reduced, and the noise prevention effect can be expected to be improved.

FIG. 9 shows a fourth embodiment of the present invention, and only the parts different from the first embodiment will be described below. That is, in this embodiment, the portion of the rib 20 facing the film damper 17 (the arc-shaped ridge portion 20a).
In addition, a friction reducing member 20c as a friction reducing means (a member formed of a material having a small friction coefficient such as a silicone resin in a film shape, a member in which short fibers are raised) is attached by adhesion or coating. It has characteristics. With such a configuration, when the film damper 17 is deformed to the downstream side, the film damper 17 comes into contact with the friction reducing member 20c, and the friction between the two is reduced, so that the noise prevention effect is obtained. You can expect improvement.

FIG. 10 shows a fifth embodiment of the present invention, and only the parts different from the first embodiment will be described below. That is, in this embodiment, the portion of the rib 20 facing the film damper 17 is formed in a planar shape, and
A friction reducing member 20d (a member formed of a material having a small friction coefficient such as a silicone resin in a film shape, a member formed by raising short fibers, etc.) as a friction reducing means is attached to the flat end surface by adhesion or coating. It has a feature in the configuration. Even with such a configuration, the friction between the film damper 17 and the friction reducing member 20d can be reduced, and the improvement of the noise prevention effect can be expected. In particular, according to the configuration of this embodiment, the film damper 17 and the friction reducing member 20d are in surface contact with each other, so that the resin coat layer 17d on the surface of the film damper 17 is prevented from being locally damaged. Therefore, it becomes possible to prevent an increase in friction due to the deterioration of the resin coat layer 17d.

In each of the above embodiments, the ribs 20, 2 are
3 are arranged so as to be oriented in the moving direction of the film damper 17, but in each of these embodiments, the ribs 20, 2 are arranged.
3 may be oriented in an oblique direction intersecting the moving direction of the film damper 17, and in such a configuration, when the film damper 17 is moved, the film damper and the ribs 20, 23 are The contact is performed over the entire area of the film damper 17, and there is an advantage that local abrasion of the resin coat layer 17d on the surface of the film damper 17 can be prevented.

[0044]

As is apparent from the above description, according to the air passage switching device of the first aspect, the film member is provided at the peripheral portion of the air passage portion whose opening is adjusted by the film member. Forms a seal surface portion that is in sliding contact with the upstream side of the air duct, and forms ribs so that a gap of a predetermined size exists between the air passage portion and the surface including the seal surface portion at the downstream side position of the film member. Since it is arranged, it is possible to prevent the frictional noise caused by the movement of the film-shaped member from being offensive to the ear while ensuring the sealing property of the film-shaped member and suppressing an increase in the manufacturing cost. Is.

According to the air passage switching device of the second aspect, in the portion of the rib facing the film member,
Since the friction reducing means for exhibiting the friction reducing effect in the state of being in contact with the film-shaped member is provided, the friction reducing means comes to exert the effect of reducing the friction with the film-shaped member. , It becomes possible to suppress the generation of fricative noise.

According to the air passage switching device of the third aspect, the above-mentioned friction reducing effect is obtained by the tapering ridge formed on the surface of the rib facing the film member. Therefore, it is not necessary to separately provide a member that constitutes the friction reducing means, and the increase in cost can be prevented as much as possible.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing a first embodiment of the present invention.

FIG. 2 is a front view of a main part showing a state in which a film damper is partially broken.

FIG. 3 is a cross-sectional view of a main part showing a state different from FIG.

FIG. 4 is a diagram showing an overall sectional structure.

FIG. 5 is a front view of a film damper.

FIG. 6 is an enlarged sectional view of the film damper.

FIG. 7 is a view corresponding to FIG. 2 showing a second embodiment of the present invention.

FIG. 8 is a sectional view of a rib portion showing a third embodiment of the present invention.

FIG. 9 is a view corresponding to FIG. 8 showing a fourth embodiment of the present invention.

FIG. 10 is a view corresponding to FIG. 8 showing a fifth embodiment of the present invention.

[Explanation of symbols]

In the drawings, 1 is an air conditioner for an automobile, 2 is an air duct, 3 is a defroster outlet (air passage), 4 is a face outlet (air passage), 5 is a foot outlet (air passage), 1
7 is a film damper (film member) for switching outlets, 18 is a ventilation opening, 19 is a frame, 19a is a sealing surface, 2
0 is a rib, 20a and 20b are ridges (friction reducing means),
20c and 20d are friction reducing members (friction reducing means), 21
Is a gap, 22 is a frame-shaped portion, 23 is a rib, and 26 is a film damper (film member) for air mix.

Claims (3)

[Claims] 1. A flexible film member having a ventilation opening is movably arranged so as to face an air passage portion formed in an air duct, and the air passage portion is moved according to the movement of the film member. In the air passage switching device that adjusts the opening degree of the air passage portion by changing the relative position between the air passage portion and the ventilation opening, the film member is provided on the peripheral portion of the air passage portion from the upstream side of the air duct. A seal surface portion formed so as to be in sliding contact, and a rib arranged so that a gap having a predetermined dimension exists between a surface including the seal surface portion at the downstream side position of the film-shaped member in the air passage portion. An air passage switching device characterized by being provided. 2. The friction reducing means for exhibiting a friction reducing effect in a state in which the rib is in contact with the film-shaped member is provided at a portion facing the film-shaped member. The air passage switching device described. 3. The air passage switching device according to claim 2, wherein the friction reducing means is a tapered ridge formed in a portion of the rib facing the film member.