JP2000142082A - Air passage switching device and air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly switch a face mode to a defroster mode in a vehicle air conditioner having a filmlike member whose movement switches a plurality of air passages of blowoff opening parts, by providing both a motor for moving the filmlike member to one direction with torque and a coil spring for moving the filmlike member to the other direction with spring force. SOLUTION: In this vehicle air conditioner, a spring force of a spring 29 moves a filmlike member 20 to switch a force mode to a defroster mode. When the spring force moves the filmlike member 20, a motor 23 requires only a low torque to rotate at a high speed so that a mode switching time is reduced. As a result, the switching to the defroster mode is rapidly performed so that cloudiness on window glass is rapidly eliminated.

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 for switching an air passage by moving a film member (film door) having an opening through which air passes in an air passage. The present invention relates to a vehicle air conditioner using the same.

[0002]

2. Description of the Related Art Conventionally, as an air passage switching device for switching an air passage by moving a film-like member of this type, for example, a device disclosed in Japanese Patent Application Laid-Open No. H8-2238 is known. In this prior art, a flexible film member such as a resin film is provided on each of a driving shaft (first rotating shaft) and a driven shaft (second rotating shaft) rotatably provided in an air conditioning case. , And a pulley is coaxially connected to each of the ends of the shafts, and both ends of the wire are wound around the pulleys. In addition, a motor is connected to the drive shaft to rotate the drive shaft.

[0003] When the drive shaft rotates in the direction of winding the film member, the drive shaft directly winds the film member,
The membrane member moves. Conversely, when the drive shaft rotates in the direction in which the film-like member is sent out, the rotation of the drive shaft is transmitted to the driven shaft via the pulleys and the wire, and the driven shaft rotates in the direction of winding the film-like member. The member is wound around the driven shaft and moves.

[0004] As described above, by moving the film-like member in both the forward and reverse directions in the air-conditioning case, the air passage such as the blow-out air passage into the vehicle compartment can be freely switched.

[0005]

In the above-mentioned prior art, however, interference between moving members such as pulleys and wires and devices such as ventilation ducts around the air conditioning case becomes a problem, and the degree of freedom in designing these devices is problematic. , Resulting in an increase in product cost. In addition, since the drive shaft and the driven shaft are linked to each other, a mechanism for connecting the two pulleys with a wire is configured.
There has been a problem that the number of parts increases as the whole apparatus, assembling becomes complicated, and the cost increases.

In contrast, West German Patent No. 3,514,358.
In the specification, there is proposed an air passage switching device using a film-like member, in which the above-described connecting mechanism (pulley and wire) can be eliminated. FIG. 12 schematically illustrates a basic configuration of a conventional technique in which the coupling mechanism is eliminated, and includes a driving motor 101, a driving shaft 100, a film-like member 102, and a driven shaft 103, and a driving shaft 103 The coil spring 104 is connected.

In this prior art, when the drive shaft 100 is rotated by the drive motor 101 in the direction in which the film member 102 is wound, the driven shaft 103 is rotated via the film member 102.
Is wound, and the coil spring 104 is wound (tightened). When the drive motor 100 rotates the drive shaft 100 in the opposite direction to the direction in which the film member 102 is unwound (sent out), the coil spring 104 is unwound by its own spring force (elastic force). By rotating the driven shaft 103 in the reverse direction by the spring force of the coil spring 104, the film-shaped member 102 can be wound around the driven shaft 103.

[0008] This prior art does not describe at all a specific relationship between the winding and rewinding directions of the coil spring 104 and the moving direction of the film-like member 102, but the coil spring 104 is attached to the driven shaft 103. Due to the connection, a difference occurs in the air passage switching time by the film-shaped member 102 due to the difference between the winding and rewinding of the coil spring 104. This will be described with reference to FIG. 13. FIG. 13 corresponds to the winding direction and the rewinding direction of the film member 102 in FIG. 12, respectively, and the film member 102 is wound around the drive shaft 100. Time (in case of moving direction)
Since the winding of the coil spring 104 increases as the movement distance of the film member 102 is increased, the torque T ₁ is increases required to winding of the coil spring 104.

Here, since the torque T ₀ required only for the movement of the film member 102 is always constant regardless of the moving distance of the film member 102, the film member 102 is wound around the drive shaft 100. In this case, the film member winding torque by the driving motor 101 increases as the moving distance of the film member 102 increases, as shown by the solid line in FIG. When the torque increases as a characteristic of the driving motor 101, the motor rotation speed decreases, so that the moving speed of the film member 102 decreases. As a result, the air passage switching time by the film-shaped member 102 becomes long, for example, about 6 seconds.

On the other hand, the film-like member 1 is
02 (in the moving direction), the coil spring 104 is rewound by its own spring force.
The driven shaft 103 is rotated in the reverse direction by the spring force to wind the film member 102 around the driven shaft 103. Therefore, the film member winding torque by the driving motor 101 is 0 as shown by the solid line in FIG. Becomes

As described above, the film-like member 102 is
When the film-shaped member 3 is wound, the film-shaped member winding torque by the driving motor 101 is not required, so that the motor rotation speed is increased and the moving speed of the film-shaped member 102 is improved. Therefore, the air passage switching time by the film-like member 102 is as short as, for example, about 3 seconds. By the way, in the vehicle air conditioner, the defroster mode is set by manual operation of the occupant, and is a mode for preventing fogging of the vehicle window glass. Therefore, when switching from another mode to the defroster mode, it is necessary to secure a view ahead of the vehicle. It is required that the switching to the defroster mode be completed as quickly as possible in as short a time as possible.

However, when the film-like member 102 is set to be switched to the defroster mode by moving in the direction in which the film-like member 102 is wound around the drive shaft 100 by the rotational force of the drive motor 101, the switching time is increased for the above-described reason. As a result, the defrosting mode of the defroster mode cannot be quickly exhibited. As a result, inconvenience occurs in securing the visibility ahead of the vehicle, which is not preferable for driving the vehicle.

[0013] When the contaminated air and odorous air are introduced into the passenger compartment by the exhaust gas of the preceding vehicle while the outside air mode is set as the inside / outside air mode of the vehicle air conditioner, the air conditioner is immediately turned on. The occupant wants to switch to the shy mode. However, if the film-like member 102 is set to be switched from the outside air mode to the inside air mode by moving in a direction in which the film-shaped member 102 is wound around the drive shaft 100 by the rotational force of the driving motor 101, the switching time is also long, A rapid switch to the inside air mode cannot be achieved, and the requirements of the occupants cannot be satisfied.

In view of the above, the present invention switches a plurality of air passages by moving a membrane member,
The film-shaped member is moved in one direction by the rotational force of a driving means such as a motor, and the film-shaped member is moved in the other direction by a spring force of an elastic means. It is another object of the present invention to quickly switch to an opening mode requiring a reduction in mode switching time among at least two or more opening modes.

Further, the present invention relates to a vehicle air conditioner,
Another object of the present invention is to make it possible to quickly switch to the defroster mode. It is still another object of the present invention to enable a vehicle air conditioner to quickly switch to an inside air mode.

[0016]

In order to achieve the above object, according to the first aspect of the present invention, the first rotating shafts (17, 41) are rotationally driven by the driving means (23) to form the film-shaped member (17). One end of the first rotation shaft (17, 4)
When it is wound up in 1), the second rotating shaft (18, 4
The elastic means (29, 32) is elastically deformed by the rotation of 2), and the first rotating shafts (17, 4) are driven by the driving means (23).
1) is driven to rotate in the reverse direction, and the film-like member (20, 3) is rotated.
When one end of 6) is unwound from the first rotating shaft (17, 41), the second rotating shaft (18, 42) is rotated by the spring force of the elastic means (29, 32) to form a film. Member (2
0, 36), the other end of which is wound around the second rotating shaft (18, 42), at least two or more of which are switched by the movement of the membrane member (20, 36). Of the aperture modes, switching to the aperture mode in which the mode switching time is desired to be reduced is performed by the elastic means (29, 3).
It is characterized in that the film-like member (20, 36) is moved by the elastic force of 2).

Here, the driving means (23) includes a first
And a manual operation mechanism for rotating the rotation shafts (17, 41) by manual operation. As described above, even with the driving means (23) including the manual operation mechanism, the switching time of the specific opening mode for which the mode switching time is desired to be shortened can be reliably reduced by the elastic force of the elastic means (29, 32).
Mode switching can be performed quickly.

Next, in the invention according to claim 2, claim 1
Is defined as a motor (23), and when the membrane member (20, 36) moves by the elastic force of the elastic means (29, 32), the required torque of the motor (23) becomes small, Since the rotation speed of the motor (23) increases, the switching time of a specific opening mode for which the mode switching time is desired to be shortened can be reliably reduced, and the mode switching can be performed quickly.

Further, according to the third aspect of the present invention, the second rotary shaft (18, 42) has a shape having an axial hollow hole (18a), and the second rotary shaft (18, 42) has a hollow hole. The elastic means is constituted by the coil spring (29) arranged in (18a). According to this, the second rotation axis (1
8, 42) coil spring (29) in the hollow hole (18a).
And the coil spring (29) can be installed compactly.

According to the invention described in claim 4, the second rotating shaft (1) is disposed outside the case member (1, 37).
The elastic means is constituted by a mainspring (32) having an outer diameter that is larger than the outer diameter of (8, 42). according to this,
The mainspring (32) can be arranged outside the case member (1, 37), and the work of assembling the mainspring (32) can be facilitated.

According to the fifth aspect of the present invention, in the first aspect,
To a defroster air opening (5) for blowing conditioned air toward the interior surface of the vehicle interior windshield, and conditioned air to the upper body of the vehicle interior occupant. And a defroster air opening (5), which is a face air opening (6) that blows out conditioned air toward the feet of the occupant in the vehicle, and a face air opening (6) that opens the face air opening (6). And a foot mode in which at least the foot air opening (7) is opened by moving the membrane member (20). Switching from the face mode to the defroster mode can be performed by the elastic means (29). , 32), which is characterized by a vehicle air conditioner in which the membrane member (20) is moved by the elastic force of the vehicle.

According to this, the switching to the defroster mode in the vehicle air conditioner can be performed reliably and quickly, and the defrosting operation by the defroster mode can be quickly performed, which is convenient for securing the visibility ahead of the vehicle. . In the invention according to claim 6, in claim 5, the switching from the face mode to the defroster mode is performed in both an automatic mode based on the determination of the air conditioning control device (31) and a manual mode based on the manual setting of the occupant. In the automatic mode, the moving speed of the film-like member (20) is lower than that in the manual mode.

As compared with the manual mode based on the manual setting of the occupant, the demand for noise reduction is generally greater in the automatic mode than in the mode switching time. In view of this, in the invention according to the sixth aspect, the moving speed of the film-like member (20) is reduced in the auto mode as compared with the manual mode, thereby moving the film-like member (20). It is possible to reduce the operation noise due to the sliding) and to improve the quietness in the vehicle interior.

According to the seventh aspect of the present invention, in the first aspect,
The air passage switching device according to any one of (1) to (4), wherein the air passage introduces outside air into the case member (37) and outside air into the case member (37). The film-like member (3) is an inside air introduction port (39, 40), which is an outside air mode that opens the outside air introduction port (38) and an inside air mode that opens the inside air introduction port (39, 40).
The air conditioner for vehicles is characterized in that it can be switched by the movement of 6), and switches from the outside air mode to the inside air mode by moving the membrane member (36) by the elastic force of the elastic means (29, 32). And

According to this, the switching to the inside air mode in the vehicle air conditioner can be performed reliably and quickly, and as a result, the introduction of polluted air and odorous air due to the exhaust gas of the preceding vehicle into the cabin is minimized. Can be minimized. The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiment described later.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 4 show a first embodiment in which the present invention is applied to an air conditioner for a vehicle. The air conditioner for a vehicle in the present embodiment is an air conditioner case (case member) made of resin. The air-conditioning case 1 is disposed at a substantially central portion in the left-right direction of an instrument panel of a vehicle interior of an automobile, and is disposed as shown in FIG.

The air-conditioning case 1 has an air inlet 2 on the side of the front side of the vehicle. In the case of a right-hand drive vehicle, the air inlet 2 is arranged on the passenger seat side surface (left side surface of the vehicle) of the air-conditioning case 1 and a blower unit (not shown) arranged on the passenger seat side of the dashboard in the vehicle compartment. ) Is connected to the air inlet 2. Therefore, when the blower in the blower unit operates, air flows into the air conditioning case 1 from the air inlet 2.

In the air conditioning case 1, an evaporator 3 and a heater core 4 are provided in this order from the air upstream side. The evaporator 3 is a cooling heat exchanger that is provided in a known refrigeration cycle and cools air blown into the air conditioning case 1. The heater core 4 is a heating heat exchanger that heats the air in the air-conditioning case 1 using hot water (engine cooling water) flowing inside as a heat source.

A plurality of blow-off air openings 5 to 7 are formed at the air downstream end of the air-conditioning case 1.
Further, an outlet duct (not shown) for blowing the conditioned air toward a predetermined location in the vehicle compartment is connected to the downstream side of 7. The defroster air opening 5 is connected to a defroster duct having a defroster outlet for blowing conditioned air toward the inner surface of the vehicle interior windshield. The face air opening 6 is connected to the center face opening 6a and the side face opening. 6b, the opening 6a and the opening 6b are respectively provided with a center face outlet for blowing conditioned air toward the occupant upper body at the center of the front seat through a face duct, and an occupant upper body for conditioned air on the front seat side glass side. It is designed to communicate with the side face outlet that blows out toward.

The foot air opening 7 is connected to a foot outlet passage 8 provided integrally with the resin case 1. The foot outlet passage 8 supplies conditioned air to the foot of the driver-side occupant. A driver's seat side foot outlet 9a for blowing the air toward the passenger seat and a passenger seat side foot air outlet 9b for blowing the conditioned air toward the passenger's seat side occupant's foot are formed.

The foot outlet passage 8 is provided with a rear foot air opening 10 to which a rear foot duct (not shown) having a rear foot outlet for blowing out conditioned air toward the rear passenger foot is provided. I have. Air conditioning case 1
Inside, a first drive shaft 11 and a first driven shaft 12 are rotatably supported with respect to the air conditioning case 1. The first drive shaft 11 and the first driven shaft 12 are each provided with a flexible member, specifically, an air mix film made of a resin film member having excellent flexibility and strength like polyethylene resin. Both ends of the shaped member 13 are connected and wound.

Then, the film member 13 for air mix 13
A hot air passage 14 passing through the heater core 4 by the first drive shaft 11, the side surface of the heater core 4, and the first driven shaft 12;
It is provided in the air-conditioning case 1 in a state where a certain tension is applied so as to cross the bypass passages 15 and 16 that bypass the heater core 4 respectively. The first drive shaft 11 is driven and rotated by a step motor (drive means) (not shown). In addition, the film-like member for air mix 1
An opening (not shown) for allowing air to pass therethrough (FIG. 2)
The first drive shaft 11 is rotated in both the forward and reverse directions by the stepping motor to stop the opening at an arbitrary position, whereby each of the passages 14 to 14 is formed. The amount of air passing through 16 is adjusted.

In the air conditioning case 1, a second drive shaft 1 is provided.
7 and the second driven shaft 18 are rotatably supported with respect to the air conditioning case 1. Both ends of a blow-out mode switching film-shaped member 20 are connected to and wound around the second drive shaft 17 and the second driven shaft 18. Here, the blow-off mode switching film-like member 20 is also made of a highly flexible resin film member similarly to the air mix film-like member 13.

FIG. 2 is an enlarged view of a drive mechanism of the blow-out mode switching film member 20. An intermediate guide shaft 1 is provided at an intermediate portion between the second drive shaft 17 and the second driven shaft 18.
9 is disposed, and the intermediate guide shaft 19 is provided along the inner wall surface of the air-conditioning case 1 with a film member 20 for blowing mode switching.
Is bent to guide the movement of the blowing mode switching film-shaped member 20. The intermediate guide shaft 19 may be rotatable so as to smoothly move the blow-out mode switching film member 20. In this embodiment, the intermediate guide shaft 19 is fixed to the resin air-conditioning case 1. As a non-rotatable configuration, cost is reduced.

Then, the blow-off mode switching film-like member 20
Are the second drive shaft 17, the intermediate guide shaft 19, and the second driven shaft 1
8, the air outlets 5 to 7 are provided with a constant tension so as to face the air upstream side wall surfaces of the outlet air openings 5 to 7, and move along the wall surfaces. The second drive shaft 17 is driven to rotate by a step motor (drive means) 23 shown in FIG. As shown in FIG. 2, a plurality of openings 20 a for allowing air to pass therethrough are formed in the blowing mode switching film-shaped member 20.
By rotating the second drive shaft 17 in both the forward and reverse directions by the step motor 21 to stop the opening 20a at an arbitrary position, the communication between the opening 20a and each of the blow-off air openings 5 to 7 is blocked. By switching, the blowing mode is switched.

In the air conditioning case 1, there are provided a cool air bypass passage 21 for guiding the cool air after the evaporator 3 directly to the face air opening 6, and a cool air bypass door 22 for opening and closing the cool air bypass passage 21. I have. The cool-air bypass door 22 opens the cool-air bypass passage 21 at the time of mac school when the opening of the film member 13 for air mix completely closes the hot-air passage 14 and fully opens the bypass passages 15 and 16.

Next, the specific structure of the drive mechanism for the blow-out mode switching film member 20 will be described in detail. FIGS. 2 to 4 show details of a drive mechanism of the blow-out mode switching film member 20. The second drive shaft 17 and the second driven shaft 18 are both made of resin. Both ends of the blow-off mode switching film-like member 20 are fixed by, for example, appropriate means such as pinching.

The second drive shaft 17 has a normal shaft shape without a hollow portion as shown in FIG. A small-diameter shaft portion 17a is formed at one end of the second drive shaft 17, and the small-diameter shaft portion 1a
7 a is rotatably supported in a bearing hole 24 of the air conditioning case 1. A connection hole 17b having a D-shaped cross section is formed at the other end of the drive shaft 17, and an insertion portion 25a having a D-shaped cross section of a resin shaft holding member (bushing) 25 is formed in the connection hole 17b.
And the shaft pressing member 25 and the second drive shaft 17 are integrally connected in the rotation direction.

The shaft pressing member 25 is provided with a plurality of (for example, three) locking claws 25b divided by slits. The locking claw portion 25b is formed on the outer peripheral side of the insertion portion 25a with a gap therebetween, and is elastically deformable in the radial direction. The outer diameter of the base portion 25c of the locking claw portion 25b is set so as to be rotatably fitted into the bearing hole 26 of the air conditioning case 1.

The shaft holding member 25 has a circular main body 25d disposed outside the air conditioning case 1.
The insertion portion 25a, the locking claw portion 25b, and the root portion 25c are integrally formed of a resin. By attaching the shaft holding member 25 to the second drive shaft 17 and the air conditioning case 1 as described above, the second drive shaft 1
The other end of 7 is rotatably supported in a bearing hole 26 via a shaft holding member 25. At this time, the positioning of the shaft holding member 25 with respect to the air conditioning case 1 can be performed by providing the locking claw portion 25b having an outer diameter larger than the root portion 25c.

The output shaft of the step motor 23 is connected to the main body 25d of the shaft holding member 25, which is arranged outside the air conditioning case 1, via an appropriate reduction gear mechanism or the like.
As described above, the rotation of the step motor 23 is transmitted to the second drive shaft 17 via the shaft pressing member 25, so that the second drive shaft 17 rotates. On the other hand, the second driven shaft 1
8 is formed in a hollow shape (cylindrical shape) having an axial hollow hole 18a at the center thereof. A small-diameter shaft portion 18b is formed at one end of the second driven shaft 18, and this small-diameter shaft portion 18b is formed.
b is rotatably supported in the bearing hole 27 of the air conditioning case 1. The hollow hole 18a is closed at one end of the second driven shaft 18,
The other end (the left end in FIG. 3) is open to the outside.

A guide rod 28 made of resin is inserted into the hollow hole 18a of the second driven shaft 18. This guide rod 2
8 has a spring mounting shaft portion 28 a, which forms a gap between the inner peripheral surface of the second driven shaft 18 and a coil spring (elastic means) 29. The guide rod 28 is formed to have the smallest diameter. The coil spring 29 is wound around the outer peripheral surface of the mounting shaft 28a, and one end (right end in FIG. 4) 29a is fitted and locked in a locking groove 28b at the tip of the mounting shaft 28a. The portion 29a is fixed to the tip of the mounting shaft portion 28a.

In the guide rod 28, the mounting shaft 2
The 8a root side of the fitting support surface 28c with a larger outer diameter by a predetermined amount than the mounting shaft portion 28a is molded, the fitting support surface 29c and the second driven shaft over a predetermined length L ₁ in FIG. 4 18 fitted with the inner circumferential surface of the second at the portion of the length L ₁
The other end of the driven shaft 18 is rotatably supported by a guide rod 28.

[0044] The slit-shaped engaging groove 1 to the other end of the second driven shaft 18 extending in the axial direction over a predetermined length L ₂
8c is formed. The other end 2 of the coil spring 29
9b is bent radially outward from the outer peripheral surface of the mounting shaft portion 28a, and the other end portion 29b is fitted and locked in the locking groove 18c. Further, the guide rod 28 is integrally formed with a fixing shaft 28d having a maximum outer diameter so as to be continuous with the fitting support surface 28c. The fixed shaft portion 28d is fixed to the fixing hole 30 of the air conditioning case 1 by means such as press fitting.

Next, a method of assembling the guide rod 28 and the coil spring 29 will be described. The coil spring 29 is wound around the mounting shaft 28a of the guide rod 28,
One end 29a of the coil spring 29 is fixed to the locking groove 28b at the tip of 8a. On the other hand, the other end 29 of the coil spring 29
b is bent outward in the radial direction. Next, the mounting shaft portion 28 of the guide rod 28 is passed through the fixing hole 30 of the air conditioning case 1.
a into the hollow hole 18a of the second driven shaft 18.

When the insertion of the mounting shaft 28a proceeds and the other end 29b of the coil spring 29 approaches the other end of the second driven shaft 18, the other end 29b is moved to the second driven shaft 18. The shaft 18 is fitted into the slit-shaped locking groove 18c, and the other end 29b is moved to the innermost portion (see FIG. 4) of the slit-shaped locking groove 18c in the axial direction and locked. This allows
The other end 29b of the coil spring 29 can be fixed to the other end of the second driven shaft 18. At the same time, the fixed shaft portion 28d of the guide rod 28 is fixed to the fixing hole 30 of the air conditioning case 1 by means such as press fitting. As a result, the other end of the second driven shaft 18 can be rotatably supported by the guide rod 28.

As described above, one end 2 of the coil spring 29
9a is connected to a guide rod 28 fixed to the air-conditioning case 1, and the other end 29b is connected to the second driven shaft 18 rotatable with respect to the air-conditioning case 1.
9 is elastically tightened by rotation of the second driven shaft 18 in one direction. Then, when the rotational force in one direction of the second driven shaft 18 is released, the coil spring 29 is rewound by its own spring force (elastic force), and moves the second driven shaft 18 in the other direction (reverse direction). Will be rotated.

Here, in the present embodiment, the coil spring 29
The relationship between the direction of winding and rewinding and the direction of movement of the blow-out mode switching film member 20 is set as follows.
That is, FIG. 2 shows a state of the defroster mode in which the opening 20a of the blowing mode switching film member 20 communicates with the defroster air opening 5, and the blowing mode switching film member 20 is in the defroster mode → face mode. Indicates the movement direction to switch to, and conversely, face mode →
The moving direction for switching to the defroster mode is shown.

The movement of the blow-off mode switching film-like member 20 in the direction is performed by winding one end of the film-like member 20 around the second drive shaft 17 by the rotational force of the step motor 23. At this time, as the film-like member 20 moves in the direction, the second driven shaft 18 rotates, and the rotation of the second driven shaft 18 causes the coil spring 29 to be elastically deformed and tightened. 29 winding directions are set.

Therefore, when the mode is switched from the defroster mode to the face mode, the coil spring 29 is wound tightly. As a result, the film member winding torque of the step motor 23 is reduced.
As shown in FIG. 13, the number of rotations of the stepping motor 23 increases as the moving distance of the membrane member increases, and the mode switching time increases. On the other hand, the movement of the blowing mode switching film-shaped member 20 in the direction is performed as follows. That is, the step motor 23 is rotated in the opposite direction to rotate the second drive shaft 17 in the opposite direction, and the one end side of the film member 20 is rewound (sent out) from the second drive shaft 17. Then, the force acting on the coil spring 29 in the winding direction disappears, and the coil spring 29 rewinds by its own spring force.

As a result, the second driven shaft 18 rotates in the reverse direction by the spring force of the coil spring 29, and the other end of the film member 20 can be wound around the second driven shaft 18, so that the film The member 20 moves in the direction and switches from the face mode to the defroster mode. At the time of this mode switching, the film member winding torque of the step motor 23 is as shown in FIG.
As shown in FIG. 5, the rotation speed of the step motor 23 increases, and the mode switching time is shortened.

Accordingly, when the occupant senses the occurrence of fogging of the vehicle window glass and turns on the defroster switch, the switching to the defroster mode can be completed quickly in a short time, and the fogging of the window glass is quickly performed. This is advantageous for securing visibility when driving the vehicle. The control of the step motor 23 is performed by the air-conditioning control device 31 shown in FIG. The air-conditioning control device 31 includes, for example, a microcomputer and its peripheral circuits, and performs predetermined arithmetic processing according to a preset program to control electric devices of the vehicle air-conditioning device. In the present embodiment, the rotation amount (rotation angle) and rotation direction of the step motor 23 are controlled by the air-conditioning control device 31.

Since the stepping motor 23 is a driving means for the blow-out mode switching film-like member 20, the air-conditioning control device 31
The rotation amount (rotation angle) and rotation direction of the stepping motor 23 are controlled based on the blowing mode signal calculated by the microcomputer or the blowing mode signal manually set by the occupant. As is well known, the air-conditioning control device 31 has inside air temperature, outside air temperature,
Signals from a group of sensors 31a for environmental factors such as the amount of solar radiation and a group of operation switches on an air conditioning control panel 31b are input.
A blowout mode switch including a defroster switch is provided in the operation switch group of the air conditioning control panel 31b.

Next, a modification of the first embodiment will be described. When the moving speed of the blowing mode switching film member 20 increases, noise increases due to sliding between the film member 20 and the wall surface of the air conditioning case 1. As a result, there is a possibility that the quietness of the vehicle interior may be impaired. On the other hand, the stepping motor 23 can change the motor rotation speed by changing the pulse rate of the applied pulse, that is, the number of pulses per unit time (1 second).

In general, the switching of the blow-out mode is performed in an automatic mode in which the air-conditioning control device 31 automatically determines the air-conditioning control device 31 based on an input signal from the sensor group 31a, and in a manual setting of the occupant (the blow-out mode of the air-conditioning control panel 31b). This is done in both the manual mode based on switching on). Therefore, in the case of the auto mode, the pulse rate of the applied pulse of the step motor 23 is reduced to reduce the number of rotations of the motor, so that the moving speed of the film member 20 is controlled by the spring force of the coil spring 29. , Reduce to normal speed level. Therefore, the film-like member 20
The noise caused by the sliding of the vehicle can be reduced, and the quietness in the vehicle interior can be ensured.

That is, in the auto mode, since the mode is not switched to the defroster mode based on the direct operation of the occupant, the noise reduction is prioritized over the reduction of the mode switching time, and the quietness in the vehicle compartment is ensured. In the first embodiment, a specific description of the drive mechanism of the air-mixing film-shaped member 13 is omitted, but a stepper motor (not shown) is connected to the first drive shaft 11 and the first driven shaft 12 Is connected to a coil spring (not shown) to move the air-mixing film-like member 13 by the rotation force of the step motor and the spring force of the coil spring, similarly to the blow-off mode switching film-like member 20. Can control.

However, since the air-mixing film member 13 continuously controls the opening degree of the hot air passage 14 and the opening degrees of the bypass passages 15 and 16, the moving direction of the air-mixing film member 13 is controlled. It is not necessary to set the coil spring 29 and the winding and rewinding directions in a specific relationship. (Second Embodiment) FIGS. 5 to 7 show a second embodiment. In the first embodiment, a second driven shaft is used as an elastic means connected to the second driven shaft 18 by the spring force of a coil spring 29. The coil spring 29 disposed in the hollow hole 18a of the spring 18 is used. In the second embodiment, a spring 32 having an outer diameter larger than the outer diameter of the second driven shaft 18 is used. Here, the mainspring 32 is a spring spirally wound on the same plane as shown in FIG.

In FIGS. 5 to 7, the same reference numerals are given to the same or equivalent parts as in the first embodiment, and the description is omitted. In the second embodiment, the mainspring 32 is connected to the air conditioning case 1.
, The second driven shaft 18 does not need to have a hollow shape, but has the same ordinary shaft shape as the second drive shaft 17. Therefore, the guide rod 28 in the first embodiment is abolished, and instead, a shaft pressing member 33 similar to the shaft pressing member 25 on the second drive shaft 17 side is disposed on the other end side of the second driven shaft 18. ing. That is, a connection hole 18d having a D-shaped cross section is formed at the other end of the second driven shaft 18, and the connection hole 1d is formed.
The tip insertion portion 33a having a D-shaped cross section of the resin shaft holding member 33 is fitted into 8d, and the shaft holding member 33 and the second driven shaft 18 are integrally connected in the rotation direction. A support shaft portion 33b is integrally formed with the shaft holding member 33. The support shaft portion 33b is rotatably fitted into the bearing hole 30 of the air-conditioning case 1 so that the other end of the second driven shaft 18 is rotated. It is rotatably supported by the bearing hole 30 via the holding member 33.

Further, the shaft holding member 33 has a shaft portion 33b.
A disk portion 33c having a sufficiently larger outer diameter is formed, and a small-diameter mounting shaft portion 33d is provided at the center of the disk portion 33c.
3b. This mounting shaft 33d
The locking groove 33e penetrating in the radial direction as shown in FIG.
The inner peripheral end 32a of the mainspring 32 is fitted and locked into the locking groove 33e, and the inner peripheral end 32a of the mainspring 32 is fixed to the mounting shaft 33d. .

In the air-conditioning case 1, a spring housing box 34 projecting outward in a cylindrical shape is integrally formed around the bearing hole 30. A spring 33 is housed inside the box 34. I have. As shown in FIG. 6, a locking hole 34 a penetrating in the radial direction is formed in the box body portion 34, and an outer peripheral end 32 b of the mainspring 32 is inserted into the locking hole 34 a.
Then, the end 32b is fixed to the box 34 by bending the end 32b along the outer peripheral surface of the box 34.

A disc-shaped lid member 35 is detachably attached to the open end of the spring storage box portion 34 by an appropriate means such as screwing. Disk portion 33 of holding member 33
The contact position of the pressing member 33 with the bottom surface of the box body portion 34 and the inner surface of the lid member 35 with the tip end of the mounting shaft portion 33d can define the mounting position of the pressing member 33. Also in the second embodiment, in the movement direction in which the blowout mode switching film-shaped member 20 switches from the defroster mode to the face mode, the mainspring spring 32 is tightened. Face mode →
In the movement direction for switching to the defroster mode,
The mainspring 32 is rewound by its own spring force.

As a result, when the mode is switched from the face mode to the defroster mode, the film member winding torque of the step motor 23 becomes 0, the rotation speed of the step motor 23 increases, and the mode switching time can be shortened. . (Third Embodiment) FIG. 8 shows a third embodiment of the present invention. In the above-described first and second embodiments, the present invention is applied to the drive mechanism of the blowing mode switching film-like member 20. However, in the third embodiment, the present invention is applied to a drive mechanism of the inside / outside air switching membrane member 36.

In FIG. 8, the inside / outside air switching box (case member) 37 has one outside air introduction port 38 for introducing outside air and two inside air introduction ports 39 and 40 for introducing inside air. Inside the box 37, the outside air inlet 38 is provided.
Further, the inside / outside air switching film member 36 is arranged to move along the inside of the inside air introduction ports 39 and 40. The inside / outside air switching membrane member 36 has an opening that can communicate with the introduction ports 38 to 40, and one end thereof is connected to the third drive shaft 41.
And the other end is connected to the third driven shaft 42. Further, an intermediate portion of the inside / outside air switching membrane member 36 is guided by two intermediate guide shafts 43 and 44. The third drive shaft 41 is rotated by a step motor (shown), and the third driven shaft 42 is rotated by elastic means such as the coil spring 29 according to the first embodiment or the spring 32 according to the second embodiment. ing.

The movement of the membrane member 36 causes the outside air inlet 3 to move.
An outside air mode or an inside air inlet 39 opening only 6;
The inside air mode in which only 40 is opened can be switched. Here, an inside / outside air mixing mode in which both the outside air introduction port 36 and the inside air introduction ports 39 and 40 are opened at a predetermined ratio can be set as needed. By the way, as the inside / outside air mode of the vehicle air conditioner, while the outside air mode is being set, when polluted air or odorous air is introduced into the passenger compartment by the exhaust gas or the like of the preceding vehicle, the air conditioner is immediately switched to the inside air mode. The occupant may want to switch.

Therefore, in the third embodiment, the third drive shaft 41 is rotated by a step motor (shown) at the time of switching from the inside air mode to the outside air mode to move the film member 36 in the direction of FIG. The elastic means connected to the driven shaft 42 is tightened. On the other hand, at the time of switching from the outside air mode to the inside air mode, a third step motor (illustrated) is used.
By rotating the drive shaft 41 in the reverse direction, the elastic means of the third driven shaft 42 is rewound by its own spring force. The third driven shaft 42 is rotated by the spring force of the elastic means, and the film-like member 36 is moved in the direction shown in FIG. 8 to switch the outside air mode to the inside air mode.

Therefore, according to the third embodiment, the switching from the outside air mode to the inside air mode is performed quickly in a short time, thereby minimizing the introduction of the polluted air and the odorous air into the passenger compartment, and meeting the requirements of the occupants. I can be satisfied. In the vehicle air conditioner, contrary to the above, to prevent fogging of the window glass,
In some cases, switching from the inside air mode to the outside air mode needs to be performed in a shorter time and more quickly than switching from the outside air mode to the inside air mode. Therefore, when such a requirement is satisfied, it may be designed so that the membrane member 36 is moved by the spring force of the elastic means when switching from the inside air mode to the outside air mode.

In FIG. 8, reference numeral 45 denotes a dust filter,
Reference numeral 6 denotes a blower, which comprises a centrifugal blower fan 46a, a fan drive motor 46b, and a scroll case 46c. The blowing air of the blowing fan 46a is supplied to the scroll case 4
6c flows into the air inlet 2 of the air conditioning case 1 of FIG. (Fourth Embodiment) FIG. 9 shows a fourth embodiment of the present invention.
0, 36, ie each drive shaft 1
An elastic (spring) means is built in each of the driven shafts 1, 17, 41 and each of the driven shafts 12, 18, and 42, and while applying elastic (spring) force to the film-like member from both of the two winding shafts, By canceling each other's elastic forces, the interlocking of the wires between the two winding shafts can be eliminated without increasing the operating force of the membrane member.

FIG. 9 is a view corresponding to FIG. 2, in which the driven shaft 18 side of the film mode switching film member 20 has the same structure as in FIG. That is, one end 29 a of the coil spring 29 is connected to the guide rod 28 fixed to the air conditioning case 1, and the other end 29 b is connected to the driven shaft 18 rotatable with respect to the air conditioning case 1. Thus, the coil spring 29 is elastically tightened by the rotation of the driven shaft 18 in one direction, and when the rotational force of the driven shaft 18 in one direction is released, the coil spring 29 becomes its own spring force. To rotate the driven shaft 18 in the other direction (reverse direction).

On the other hand, the blow-off mode switching film member 2
The structure of the drive shaft 17 is different from that of FIG. 2, and the drive shaft 17 is formed in the same hollow shape (cylindrical shape) as the driven shaft 18. A guide rod 280 similar to the guide rod 28 is used instead of the shaft pressing member 25 of FIG. 2, and a coil spring 29 is mounted on the outer periphery of the mounting shaft 280a of the guide rod 280.
A coil spring 290 similar to the above is disposed, and one end of the coil spring 290 is connected to the tip of the shaft 280a.

The mounting shaft 280 a of the guide rod 280 and the coil spring 290 are inserted into the hollow hole of the drive shaft 17, and the other end of the coil spring 290 is connected to the drive shaft 17. The connection structure via the coil spring 290 may be the same as the connection structure on the side of the driven shaft 18 shown in FIG. The large diameter portion 280 at the root of the guide rod 280
b is connected to the output shaft of the step motor 23, and the rotation of the step motor 23 causes the guide rod 280 to rotate.

FIG. 10 (a) schematically shows a main part of the fourth embodiment, in which the coil spring 2 on the driven shaft 18 side is used.
In 9, the winding direction is set so that the spring force A acts in the direction of winding the film member 20 around the driven shaft 18. On the other hand, the winding direction of the coil spring 290 on the drive shaft 17 side is set so that the spring force B acts in the direction in which the film member 20 is wound around the drive shaft 17. That is, the spring force A of the coil spring 29 on the driven shaft 18 side and the spring force B of the coil spring 290 on the drive shaft 17 act in directions opposite to each other. And two coil springs 2
The spring forces A and B of 9, 290 are set to be substantially equal to each other so that the spring forces of each other can be offset.

Next, the operation of the fourth embodiment will be described in comparison with the first embodiment. FIG. 11A schematically shows the main part of the first embodiment, and FIG. This is a corresponding view, and in the first embodiment, the coil spring 290 is not provided on the drive shaft 17 side. FIG. 10 (b), FIG. 11 (b)
Are the spring force on the vertical axis and the displacement of the film-like member 20 on the horizontal axis. The spring force on the vertical axis is the film-like member 2
The force in the direction of pulling 0 in the direction (left direction) is positive, and the force in the direction of pulling the membrane member 20 in the direction (right direction) is negative.

In FIG. 10B and FIG. 11B, F ₀ is the frictional force of the film-like member 20, and F ₃ is the minimum force required to wind the film-like member 20 around the shaft. And is a value larger than the frictional force F ₀ by a predetermined value. In the first embodiment, since the coil spring 290 is not provided on the drive shaft 17 side, when the membrane member 20 is displaced in the direction (rightward), the coil spring 29 on the driven shaft 18 is tightened while winding the coil spring 29. Is displaced. Therefore, the spring force A increases as the displacement amount of the film-like member 20 in the direction (rightward) increases as shown in FIG.
It increases as shown in (b).

Accordingly, the film-like member 20 moves in the direction (right direction).
Required motor force when displacing to ₀+ Spring force A
And its maximum value is F₁Will rise to In contrast
Thus, according to the fourth embodiment, as shown in FIG.
The spring forces A and B of the two coil springs 29 and 290 are substantially equal
So that they can cancel each other's spring force
The film-like member 20 is displaced in the direction (rightward).
Required motor force is F₀+ Spring force A + spring force B
And the maximum value is F₁F much smaller than_Twoso
is there.

Further, the film-like member 20 moves in the direction (left direction).
The required motor force for displacement is F₀-Spring force A-Spring force
B and its maximum value is also F_TwoIt is. Therefore,
According to the fourth embodiment, the film-like member 20 is wound up.
The required motor power can be effectively reduced, and the drive motor is small.
This is extremely advantageous for the formation of a material. By the way, FIG.
And F_FourIs the maximum value of the spring force A (spring force B),
Minimum force F required to wind film member 20 around the shaft_Three
And the maximum spring force F _FourIs related to (F_Four/ 2) <F_ThreeWhen
It is set to become. Next, the reason for this setting
To explain, the required motor power is maximized in FIG.
(B) As shown in FIG.
You.

Here, the minimum spring force F at both ends is obtained._ThreeWhen
Maximum spring force F_FourAnd the ratio (F_Three/ F _Four) Required motor power
To summarize how it affects the maximum value of
Become like That is, the maximum value of the required motor force = F₀+
F_Four-F_Three, So F_Three/ F_FourAs they approach 1
Therefore, the maximum value of the required motor force is reduced. F_Three=
0 (F_Three/ F_Four= 0), the maximum required motor power
= F₀+ F_FourWhich is the same as the case of only the spring force A.
Therefore, there is no offset effect by the spring force B. On the other hand, F_Three= F_Four
(F_Three/ F_Four= 1) can minimize the required motor power
However, since the spring force always changes with the displacement,_Three= F
_FourIt is not possible.

Therefore, the effective area where the required motor force can be reduced in practice is (1/2) <(F
₃ / F ₄ ), which means that (F ₄ / F ₄ )
2) It is a range where <F ₃ is satisfied. (Other Embodiments) In the above embodiment, the film member 13 for air passage switching,
Although the case where the stepping motor is used as the driving motors 20 and 36 has been described, a DC motor can be used as the driving motor. In the case of a DC motor, the motor rotation amount cannot be specified by the number of pulses as in the case of a stepping motor. The feedback control of the current supply to the DC motor may be performed so that the value of the rotation speed coincides with the target rotation amount.

As in the modification of the first embodiment, when the moving speed of the blowing mode switching film member 20 in the automatic mode is lower than in the manual mode, if the driving motor is a DC motor, the motor Since the motor rotation speed can be changed by changing the applied voltage, in the case of the auto mode, the DC motor applied voltage is reduced to lower the motor rotation speed. Thus, the moving speed of the film-like member 20 may be reduced to reduce noise caused by the sliding of the film-like member 20.

In the switching of the inside / outside air mode according to the third embodiment, the moving speed of the inside / outside air mode switching film member 36 in the automatic mode is lower than that in the manual mode, and the noise caused by the sliding of the film member 36 is reduced. May be reduced. In each of the above embodiments, the air passage switching membrane member 1 is used.
Although the case where a motor is used as the driving means of 3, 20, and 36 has been described, a manual operation mechanism such as a dial and a lever provided on the air conditioning control panel and manually operated by an occupant is used to drive the film-like members 13, 20, and 36 It can also be used as a means.

In each of the above embodiments, the case where the present invention is applied to a vehicle air conditioner has been described. However, the present invention can be widely applied not only to a vehicle air conditioner but also to various uses as an air passage switching device. Things.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air conditioning unit of a vehicle air conditioner to which the present invention is applied.

FIG. 2 is an exploded perspective view of a blowing mode switching device according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view of a main part of FIG. 2 in an exploded state.

FIG. 4 is an enlarged sectional view of an assembled state of a driven shaft of FIG. 3;

FIG. 5 is an exploded cross-sectional view of a blowing mode switching device according to a second embodiment of the present invention.

6 is an enlarged cross-sectional view of the mainspring of FIG. 5 in an assembled state.

FIG. 7 is an enlarged sectional view of an assembled state of a driven shaft portion of FIG. 5;

FIG. 8 is a cross-sectional view of an inside / outside air mode switching device portion showing a third embodiment of the present invention.

FIG. 9 is an exploded perspective view of a blowing mode switching device according to a fourth embodiment of the present invention.

FIG. 10 is an operation explanatory view of the fourth embodiment.

FIG. 11 is an operation explanatory view of the first embodiment.

FIG. 12 is an explanatory diagram of a basic configuration of a conventional device.

FIG. 13 is an operation characteristic diagram of a film-shaped member driving motor used for explaining the operation of the conventional device and the present invention.

FIG. 14 is an operation explanatory view of the fourth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Air-conditioning duct (case member), 5 ... Defroster air opening, 6 ... Face air opening, 7 ... Foot air opening, 1
7, 41: drive shaft (first rotary shaft), 18, 42: driven shaft (second rotary shaft), 20: membrane member for blowing mode switching, 23: step motor (drive means), 29: coil Spring (elastic means), 31 ... air-conditioning control device, 32 ... spring (elastic means), 36 ... membrane member for switching inside and outside air,
37: inside / outside air switching box (case member), 38: outside air inlet, 39, 40 ... inside air inlet.

Claims (7)

[Claims] A film member (2) for switching a plurality of air passages (5-7, 38-40) of a case member (1,37).
0, 36), one end of the film-like member (20, 36) is connected to a first rotating shaft (17, 41), and the film-like member (2,
0, 36) is connected to a second rotating shaft (18, 42), and a driving means (23) is connected to the first rotating shaft (17, 41), and the second rotating shaft is connected to the second rotating shaft (18, 42). An elastic means (29, 32) is connected to the shaft (18, 42), and the first rotating shaft (17,
41) is driven to rotate, and the film-like member (20, 36) is rotated.
When one end side of the shaft is wound around the first rotating shaft (17, 41), the elastic means (29, 32) is elastically deformed by the rotation of the second rotating shaft (18, 42), and the driving is performed. By means (23), the first rotating shaft (17,
41) is driven to rotate in the opposite direction, and the film-like member (2) is rotated.
0, 36) is connected to the first rotating shaft (17, 41).
The elastic means (29, 32) when unwound from
The second rotating shaft (18, 42) is rotated by the elastic force of the second member, and the other end of the film-like member (20, 36) is in the second position.
In the air passage switching device configured to be wound around the rotating shaft (18, 42), at least the plurality of air passages (5 to 7, 38 to 40) are moved by moving the film-shaped member (20, 36). The mode is switched to two or more aperture modes. Of the two or more aperture modes, switching to the aperture mode whose mode switching time is desired to be shortened is performed by the elastic means (29,
32. An air passage switching device, wherein the film member (20, 36) is moved by the elastic force of 32). 2. The air passage switching device according to claim 1, wherein said driving means is a motor (23). 3. The second rotating shaft (18, 42) has a shape having an axial hollow hole (18a), and the elastic means includes a hollow hole in the second rotating shaft (18, 42). (18
3. The air-path switching device according to claim 1, wherein the air-path switching device is a coil spring disposed in a). 4. The elastic member is provided with the case member (1,
37), and is disposed outside the second rotation axis (18, 4).
A spring (3) having an outer diameter larger than the outer diameter of (2)
The air passage switching device according to claim 1 or 2, wherein (2) is used. 5. An air passage switching device according to claim 1, wherein the air passage is a defroster air opening (5) for blowing conditioned air toward an inner surface of a vehicle interior windshield, and a vehicle. A face air opening (6) for blowing air-conditioned air toward the upper body of the cabin occupant; and a foot air opening (7) for blowing air-conditioned air toward the foot of the cabin occupant. A face mode for opening the defroster air opening (5), and a foot mode for opening at least the foot air opening (7) by moving the membrane member (20). Switching from the face mode to the defroster mode is performed by moving the membrane member (20) by the elastic force of the elastic means (29, 32). An air conditioner for a vehicle characterized by performing. 6. The switching from the face mode to the defroster mode is performed in both an auto mode based on a determination of the air conditioning control device (31) and a manual mode based on manual setting of an occupant. The vehicle air conditioner according to claim 5, wherein the moving speed of the film-shaped member (20) is lower in the auto mode than in the manual mode. 7. An air passage switching device according to any one of claims 1 to 4, wherein the air passage includes an outside air inlet (38) for introducing outside air into the case member (37), and the outside air introduction port (38). Case member (3
7) The inside air introduction port (39, 40) for introducing inside air into the inside, and the outside air mode for opening the outside air introduction port (38) and the inside air mode for opening the inside air introduction port (39, 40) are film-shaped. The switching from the outside air mode to the inside air mode is performed by the movement of the member (36), and the film-like member (3) is switched by the elastic force of the elastic means (29, 32).
6. An air conditioner for a vehicle, wherein the air conditioner is moved.