JP2000198345A - Air passage switching device and air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure motor torque required for moving a membrane member in the spring force increase direction, in a device for moving the membrane member by the torque of a driving step motor in one direction while in the other direction by the spring force of a coil spring. SOLUTION: When a membrane member 20 moves in one direction (DEF→FACE), even if a coil spring 29 is elastically deformed onto spring force increase side, the pulse rate of a step motor 23 is made small to increase motor torque to prevent torque shortage. When the membrane 20 moves in the other direction (FACE→DEF), the pulse rate of the step motor 23 is made large to reduce motor torque to heighten motor rotating speed.

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 used.

[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, 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 reduced. As a result. In addition, since a mechanism for connecting the two pulleys with a wire in order to interlock the drive shaft and the driven shaft is configured, the number of parts as a whole apparatus increases, and the assembling becomes complicated, There was a problem that the cost was high.

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. 22 schematically shows the basic structure of the prior art in which this connecting mechanism is abolished, and includes a driving motor 100, a driving shaft 101, a film-like member 102, and a driven shaft 103, and the driven shaft 103 The coil spring 104 is connected.

In this prior art, when the driving shaft 101 is rotated by the driving motor 100 in a 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 shaft 101 is rotated in the opposite direction to the unwinding (feeding out) of the film member 102 by the driving motor 100, the coil spring 104 is unwound by its own spring force. The film-shaped member 102 can be wound around the driven shaft 103 by rotating the driven shaft 103 in the reverse direction by a spring force.

[0008]

According to the prior art, when the drive shaft 101 is rotated by the drive motor 100 in the direction in which the film-like member 102 is wound, the coil spring 1 is used.
Since 04 is tightened, the tightening spring force of the coil spring 104 increases in proportion to the moving distance (stroke amount) of the film-shaped member 102. In other words, the film-like member 102
The operating force of the film-like member 102 increases in proportion to the moving distance.

This will be described with reference to FIG. 5. FIG. 5 corresponds to the winding direction and the rewinding direction of the film member 102 shown in FIG. When the film is wound (in the moving direction), the winding amount of the coil spring 104 increases as the moving distance of the film member 102 increases.
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 101. In this case, the film member winding torque by the driving motor 100 increases as the moving distance of the film member 102 increases, as shown by the solid line in FIG.

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.
By rotating the driven shaft 103 in the reverse direction by the spring force of the above, the film-shaped member 102 is wound around the driven shaft 103. Therefore, the film-shaped member winding torque by the driving motor 100 is 0 as shown by the solid line in FIG. Becomes

By the way, in the above-mentioned prior art, the film-like member 1
There is no description about the handling of the operating force that increases with the movement stroke amount of 02. Therefore, the coil spring 1
In the process of moving the film-shaped member 102 in the winding direction 04, the torque of the driving motor 100 is insufficient,
There is a possibility that an operation failure of the film-like member 102 may occur.

In view of the above, the present invention switches a plurality of air passages by moving a membrane member,
In the air passage switching device in which the membrane member is moved in one direction by the rotational force of a driving motor and the membrane member is moved in the other direction by the spring force of the elastic means, the travel distance of the membrane member is increased. It is another object of the present invention to prevent the drive motor from running out of torque when the membrane member moves in a direction in which the spring force of the elastic means increases.

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.

[0015]

According to the present invention, first, a stepping motor in which a motor rotation amount (rotation angle) is defined by a pulse step number (input pulse number) is used as a motor for driving the film-shaped member. In this step motor, the torque changes as shown in FIG. 6 by increasing or decreasing the pulse rate PPS, which is the number of pulses per unit time (usually one second). That is, the pulse rate P
The relationship is such that the motor torque decreases as the PS increases.

Therefore, focusing on the pulse rate PPS in the step motor, the present invention aims to achieve the above object by variably controlling the pulse rate PPS in association with the moving direction of the film-shaped member. is there.

Further, the present invention is directed to a motor using a DC motor as a motor for driving the film-shaped member. The DC motor has a torque in accordance with an increase in applied voltage as shown in FIG. Are in a relationship of increasing. Therefore,
The above object is achieved by paying attention to the relationship between the applied voltage and the torque in the DC motor and variably controlling the applied voltage in association with the moving direction of the membrane member.

Specifically, according to the first aspect of the present invention, the first rotating shaft (11, 1) is driven by the step motor (23).
7) is driven to rotate, and when one end side of the film-like member (13, 20) is wound around the first rotating shaft (11, 17), the elasticity is generated by the rotation of the second rotating shaft (12, 18). The means (29) is elastically deformed to increase the spring force, and the first rotating shafts (11, 17) are rotationally driven in the reverse direction by the step motor (23), so that one end of the film-like member (13, 20). When the side is unwound from the first rotating shaft (11, 17),
The second rotating shaft (12, 12) is driven by the spring force of the elastic means (29).
18) is rotated so that the other end side of the film member (13, 20) is wound around the second rotating shaft (12, 18). The pulse rate, which is the number of pulses per unit time of the input pulse applied to the stepping motor (23) when one end of the film is wound around the first rotating shaft (11, 17), and the film-like member (13, 20) ) Is the second rotation axis (12,
18) When it is taken up by a step motor (23)
And the pulse rate, which is the number of input pulses applied per unit time, is set to satisfy the relationship of the former pulse rate <the latter pulse rate.

According to this, when one end of the film-like member (13, 20) is wound around the first rotating shaft (11, 17) by the rotational force of the step motor (23), the elastic means (29) is turned on. The spring force is elastically deformed toward the increasing side. At this time, the torque of the step motor (23) can be automatically increased by reducing the pulse rate of the step motor (23). Therefore, a motor torque necessary for moving the film-shaped member can be secured, and thus a malfunction of the film-shaped member due to insufficient torque can be prevented.

On the other hand, when the membrane members (13, 20) move by the spring force of the elastic means (29), the required torque of the step motor (23) becomes small. Therefore, in this case, by increasing the pulse rate of the step motor (23), the torque of the step motor (23) can be reduced, and the motor rotation speed can be increased. That is, by utilizing the spring force of the elastic means (29) for moving the membrane member and increasing the rotation speed of the step motor (23), the movement of the membrane member (switching of the air passage) can be performed quickly and in a short time. Can be completed.

According to the second aspect of the present invention, in the first aspect,
In place of the step motor, the DC motor (2
The voltage applied to the DC motor (23) when one end of the film-like member (13, 20) is wound around the first rotating shaft (11, 17) using the film-like member (13, 20). Of the DC motor (23) when the other end is wound around the second rotating shaft (12, 18).

According to this, when one end of the film-like member (13, 20) is wound around the first rotating shaft (11, 17), and the elastic means (29) elastically deforms to the side where the spring force increases, By increasing the voltage applied to the DC motor (23), the torque of the DC motor (23) can be automatically increased. Therefore, a motor torque necessary for moving the film-shaped member can be secured, and thus a malfunction of the film-shaped member due to insufficient torque can be prevented.

According to the third aspect of the present invention, a stepping motor (23) is used as a motor for driving the film-like member, and one end of the film-like member (13, 20) is connected to the first rotation shaft (11, 20).
Step 17 (23)
The pulse rate of the input pulse applied to the
It is characterized in that it is gradually reduced in accordance with the increase in the spring force of 9).

According to this, by gradually decreasing the pulse rate in accordance with the increase in the spring force of the elastic means (29), it is possible to obtain a motor torque commensurate with the increase in the spring force. Therefore, a motor torque required for moving the film-shaped member can be secured, and malfunction of the film-shaped member due to insufficient torque can be prevented.

Moreover, since the pulse rate can be increased or decreased in accordance with the increase or decrease in the spring force of the elastic means (29), the elastic means (2)
If the spring force of 9) is the same (the position of the membrane member is the same),
Regardless of the moving direction of the film-like members (13, 20), the torque and the rotation speed of the step motor (23) can be made the same. Therefore, the passage switching action of the membrane members (13, 20) can be made constant regardless of the moving direction.

According to the fourth aspect of the present invention,
In place of the step motor, the DC motor (2
When one end of the film member (13, 20) is wound around the first rotating shaft (11, 17) using the method (3), the voltage applied to the DC motor (23) is changed by the spring force of the elastic means (29). It is characterized in that it is gradually increased as the number increases.

According to this, the same effect as the third aspect can be exhibited by adjusting the applied voltage of the DC motor (23).

According to the fifth aspect of the present invention, a stepping motor (23) is used as a film member driving motor, and the pulse rate of an input pulse applied to the stepping motor (23) is adjusted by the film member (13, 20). ) Is changed according to the position.

As described above, the pulse rate is controlled by the film-like member (1).
By changing the position of the membrane member (13, 20) toward the spring force increasing side of the elastic means (29), the pulse rate is reduced by changing the stepping motor (23, 20). ) Can be automatically increased. Therefore, it is possible to secure the necessary motor torque and prevent a malfunction of the film-shaped member due to insufficient torque.

According to the sixth aspect of the present invention, the fifth aspect of the present invention is provided.
In place of the step motor, the DC motor (2
The method is characterized in that the voltage applied to the DC motor (23) is changed according to the position of the film-like member (13, 20) using the method (3).

According to this, the same effect as the fifth aspect can be exhibited by adjusting the applied voltage of the DC motor (23).

According to the seventh aspect of the present invention, the second rotary shaft (12, 18) is formed to have a shape having an axial hollow hole (18a), and the second rotary shaft (12, 18) has a hollow hole. The elastic means is constituted by the coil spring (29) arranged in (18a).

According to this, the second rotation shaft (12, 1
The coil spring (29) can be built in the hollow hole (18a) of 8), and the coil spring (29) can be installed compactly.

According to an eighth aspect of the present invention, there is provided the air passage switching device according to any one of the first, third and fifth aspects, wherein the air passage directs conditioned air toward the inner surface of the vehicle interior windshield. A defroster air opening (5) that blows out, a face air opening (6) that blows conditioned air toward the upper body of the vehicle occupant, and a foot air opening (7) that blows conditioned air toward the foot of the vehicle occupant; A face mode in which the face air opening (6) is opened, a defroster mode in which the defroster air opening (5) is opened, and a foot mode in which at least the foot air opening (7) is opened can be switched by moving the membrane member (20). Has become
Switching from defroster mode to face mode,
The film-like member (20) is moved by the stepping motor (23), and conversely, the switching from the face mode to the defroster mode is performed by moving the film-like member (20) by the spring force of the elastic means (29). It is characterized by being performed.

According to this, in the vehicle air conditioner,
When switching from the defroster mode side to the face mode side, the elastic means (29) elastically deforms to the side where the spring force increases, but as described above, the required motor torque is secured by reducing the pulse rate. Thus, operation failure due to insufficient torque can be prevented.

On the other hand, when switching to the defroster mode side in the vehicle air conditioner, the membrane member (20) is moved by the spring force of the elastic means (29).
By increasing the pulse rate, the motor rotation speed can be increased to quickly switch to the defroster mode, and the fogging removal effect by the defroster mode can be quickly exerted, which is convenient for securing the visibility ahead of the vehicle. .

According to the ninth aspect of the present invention, the eighth aspect of the present invention is provided.
, The switching between the face mode, the foot mode, and the defroster mode is performed by both the automatic method based on the determination of the air conditioning control device (31) and the manual method based on the manual setting of the occupant. The case is characterized in that the pulse rate is made higher than in the case of the auto system.

Generally, in the case of the manual system based on the manual setting of the occupant, the demand for reducing the mode switching time is stronger, whereas in the case of the automatic system, the request for noise reduction is stronger than the reduction of the mode switching time. In view of this point, in the invention according to the ninth aspect, in the case of the manual mode, the pulse rate is made larger than in the case of the automatic mode, the moving speed of the film member (20) is increased, and the mode switching time is reduced. Can be shortened.

On the other hand, in the case of the automatic method, the pulse rate is reduced in the case of the manual method, the moving speed of the film member (20) is reduced, and the operation accompanying the movement (sliding) of the film member (20) is performed. The noise can be reduced, and the quietness in the vehicle interior can be improved.

According to the tenth aspect of the present invention, in the eighth aspect, the switching between the face mode, the foot mode and the defroster mode is performed by an automatic system based on the judgment of the air conditioning control device (31) and a manual setting of the occupant. In this case, the pulse rate is set to be higher when the defroster mode is manually set in the manual mode than in other modes.

According to this, when the defroster mode is manually set, the defroster mode can be quickly set by always setting the pulse rate higher than in other modes.

The reference numerals in the parentheses indicate the correspondence with specific means described in the embodiments described later.

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIGS. 1 to 11 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 part 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. The opening 6a is branched into a side face opening 6b, and the opening 6a and the opening 6b are respectively opened via a face duct to blow out the conditioned air toward the upper body of the occupant in the center of the front seat, and the conditioned air to the side glass on the front seat side. It communicates with the side face outlet that blows out toward the occupant's upper body.

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 a 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 connected. I have.

In the air conditioning case 1, 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
The flexible member, specifically, flexibility, like polyethylene resin, both ends of the air mix film-like member 13 composed of a resin film member having excellent strength are connected,
It is wound.

Then, the film member 13 for air mix is used.
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 stretched 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). An opening (not shown) (not shown) for allowing air to pass therethrough is formed in the film member 13 for air mixing.
By rotating the drive shaft 11 in both forward and reverse directions to stop the opening at an arbitrary position, the passages 14 to 1
The amount of air passing through 6 is adjusted.

The second drive shaft 1 is provided in the air conditioning case 1.
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 the 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 blowing mode switching film 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 stretched in a state where a constant tension is applied 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, and the stepping motor 21 causes the second drive shaft 17 to move in both forward and reverse directions. The blowing mode is switched by rotating and stopping the opening 20a at an arbitrary position, thereby switching communication between the opening 20a and each of the blow-off air openings 5 to 7 and blocking.

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 holding 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 pressing member 25 to the second drive shaft 17 and the air-conditioning case 1 as described above, the other end side of the second drive shaft 17 becomes the shaft pressing member 25.
Is rotatably supported in the bearing hole 25 through the hole. On this occasion,
By providing the locking claw portion 25b having an outer diameter larger than the root portion 25c, the positioning of the shaft pressing member 25 with respect to the air conditioning case 1 can be performed.

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 a suitable 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 18 is formed in a hollow shape (cylindrical shape) having an axial hollow hole 18a at the center thereof. A small-diameter shaft portion 18 is provided at one end of the second driven shaft 18.
The small diameter shaft portion 18b is rotatably supported in the bearing hole 27 of the air conditioning case 1. The hollow hole 18a is the second
Closed at one end of the driven shaft 18 and the other end (left end in FIG. 3)
Is open to the outside.

Then, 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. It is formed to have the smallest diameter. As shown in an enlarged view in FIG. 4, the coil spring 29 is wound around the outer peripheral surface of the mounting shaft 28a, and one end (right end in the drawing) 29a
Is fitted and locked in the locking groove 28b at the tip of the mounting shaft 28a, and the one end 29a is fixed to the tip of the mounting shaft 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.

The other end of the second driven shaft 18 has a slit-shaped locking groove 1 extending over a predetermined length L ₂ in the axial direction.
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 other end portion 29b of the coil spring 29 approaches the other end side of the second driven shaft 18, the insertion of the mounting shaft portion 28a proceeds, and the other end portion 29b is moved to the second driven side. 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 a guide rod 28 driven by rotation of the second driven shaft 18 in one direction.
Is elastically wound around the mounting shaft 28a. 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 to rotate the second driven shaft 18 in the other direction (reverse direction). become.

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 membrane member 20 communicates with the defroster air opening 5, and indicates that the blowing mode switching membrane member 20 is on the defroster mode side → face. A movement direction for switching to the mode side is shown, and conversely, a movement direction for switching from the face mode side to the defroster mode side.

The movement in the direction of the blow-off mode switching film member 20 is performed by winding one end of the film 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 tightened. As a result, the film member winding torque of the step motor 23 is changed as shown in FIG. The rotation speed of the step motor 23 decreases as the distance increases.

On the other hand, the blowing mode switching film-like member 2
The movement in the direction of 0 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 unwound (sent) 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 side to the defroster mode side. At the time of this mode switching, the film member winding torque of the step motor 23 becomes 0 as shown in FIG.
, The mode switching time is shortened.

Therefore, 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 stepping motor 23 has a motor rotation amount (rotation angle) defined by the number of pulse steps (number of input pulses) as is well known, and the stepping motor 23 has a unit time (1 second). The torque changes as shown in FIG. 6 according to the pulse rate PPS which is the number of pulses per hit. In FIG. 6, A shows a starting characteristic which is a torque characteristic when the motor is started from a motor stationary state, and B shows a slewing characteristic which is a torque characteristic that can be followed in a motor rotating state. As understood from the characteristics A and B, the stepping motor 23 has a characteristic that when the pulse rate PPS increases, the motor torque decreases and the motor rotation speed increases.

As the step motor 23, a PM type step motor using a rotor made of a permanent magnet is preferable, and the holding force of the rotor is obtained by the magnetic force of the permanent magnet even when the stator coil is not excited. Since the holding force by the permanent magnet is always set to be larger than the spring force of the coil spring 29, the rotor position when the stator coil is not excited can be held.

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 of the film member 20 for switching the blowing mode, the air conditioner controller 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 31c of the air conditioning control panel 31b are input. The operation switch group 31 of the air conditioning control panel 31b
A blowing mode switch including a defroster switch is provided in c.

Next, an example of control of the step motor 23 according to the first embodiment will be described with reference to the flowchart of FIG. In the control example of FIG. 7, as described above, the control is based on the assumption that the moving direction of the film-shaped member for switching from the face mode side to the defroster mode side is the rewinding direction of the coil spring 29.

The control routine shown in FIG.
The operation is started by turning on the auto switch or the air flow rate switch in the operation switch group 31c of FIG. 1b.
In step S100, the step number SPp of the step motor 23 is initialized to zero. The initialization of the number of steps SPp = 0 means that the position of the film-like member 20 is positioned at a predetermined position before the face (FACE) mode position as shown in FIG. The initialization of the position of the film-like member 20 to the face mode side is performed by the coil spring 29.
Is the direction for switching from the face mode to the defroster mode.

Next, at step S110, the sensor group 31a and the operation switch group 3 of the air-conditioning control panel 31b shown in FIG.
1c and the like, and in step S120,
The target blowing temperature TAO of the blowing air into the vehicle compartment is calculated.
The equation for calculating the TAO is well known, and the blowout temperature required to maintain the temperature in the vehicle interior at the set temperature set by the temperature setting switches in the operation switch group 31c is determined in consideration of the heat load conditions in the vehicle interior. And calculate. The target outlet temperature TAO serves as basic data for air conditioning control.

Next, the blowing mode is determined in step S130. The blowout mode is determined in two ways. One of them is an automatic method using the target blowing temperature TAO (see FIG. 9). When the target blowing temperature TAO is the lowest, the face mode is determined. This face mode is a blowing mode in which air is blown toward the upper body of the occupant through the face air opening 6 (see FIG. 1). When the target outlet temperature TAO rises to the first predetermined temperature, the bi-level (B / L) mode is determined. The bi-level mode is a blowing mode in which air is blown through both the face air opening 6 and the foot air opening 7 toward the occupant's upper body and the occupant's feet.

When the target outlet temperature TAO rises to a second predetermined temperature which is higher than the first predetermined temperature by a predetermined temperature, a foot (FOOT) mode is determined. This foot mode is a blowing mode in which air is mainly blown out toward the foot of the occupant through the foot air opening 7 and a small amount of air is blown out through the defroster air opening 5 toward the inside of the vehicle interior windshield.

The other type is a manual type. The operation switch group 31c of the air-conditioning control panel 31b is provided with a face switch, a bi-level switch, a foot switch, a foot defroster switch, and a defroster switch as blowing mode switches. ing. By manually operating these mode switches, the face, bi-level, and foot modes described above, as well as the foot defroster (F / D) mode and the defroster (DE
F) Mode can be set manually. Since the manual mode is the selection of the blowing mode based on the occupant's intention, the blowing mode is determined prior to the automatic mode.

Unlike the foot mode, the foot defroster mode is a blowing mode in which the amount of air blown out from the foot air opening 7 and the amount of air blown out from the defroster air opening 5 are substantially equal. The defroster mode is a blowing mode in which air is blown through the defroster air opening 5 to the inner surface of the windshield.

As described above, in step S130, the blowing mode is determined by either the automatic method using TAO or the manual method, and the target step number SPo corresponding to the blowing mode is determined. The target step number SPo is used to determine the amount of rotation (rotation angle) of the step motor 23, and a specific example thereof is as shown in FIG. 10, and the blow mode includes face → bilevel → foot → foot defroster → defroster. Are determined so that the target number of steps SPo increases as moves.

Next, in step S140, the number of output steps SW actually applied to the step motor 23 is set to SW
= SPo-SPp. Here, in the first SW calculation after the start of the control routine in FIG. 7, SPp = 0 is applied to the above equation by initialization in step S100, but in the next and subsequent SW calculations, step S described later is used.
The number of steps SPp according to 220 corresponding to the current position of the membrane 20 is applied to the above equation.

As understood from FIG. 10, SP
o The number of output steps SW calculated by the formula of -SPp
Has a positive value in the mode switching direction from the face side to the defroster side, and has a negative value in the mode switching direction from the defroster side to the face side. The rotation direction of the step motor 23 is also reversed in both forward and reverse directions by the reversal of the output step number SW.

Next, it is determined in step S150 whether or not the blowing mode has been changed. This determination is made based on whether SW ≠ 0. That is, when the blowing mode needs to be changed, the target step number SPo always becomes a value different from the step number SPp corresponding to the current position of the film-shaped member 20, so that the determination in step S150 becomes YES, and the next Proceed to step S160. On the other hand, when there is no need to change the blowing mode, SPo = SPp and SW = 0,
It returns to step S110.

In step S160, it is determined whether the moving direction of the film member 20 (the blowing mode switching direction) is the direction from the face side to the defroster side (the rewinding direction of the coil spring 29). This determination may be made by determining whether the output step number SW is a positive value (SW> 0), as understood from the description of step S140.

If the moving direction of the film member 20 (the blowing mode switching direction) is the direction from the face side to the defroster side, the process proceeds to step S170, where the pulse rate PPS of the input pulse of the step motor 23 is set to the first predetermined value. It is set to a value PPS _1. On the other hand, if the moving direction of the film member 20 (the blowing mode switching direction) is the direction from the defroster side to the face side (the winding direction of the coil spring 29), the process proceeds to step S180, and the pulse rate PPS is set to the second predetermined value. Set to PPS ₂ .

Here, the first and second predetermined values PPS ₁ , PP
S _2, as shown in FIG. 11 (similar to the torque characteristic diagram and FIG. 6 above), a relationship of PPS _1> PPS _2. Therefore, the motor torque is equal to the torque T _A at PPS ₁ <
A relationship of torque T _B in time PPS _2.

That is, when the moving direction of the film-shaped member 20 is from the face side to the defroster side, the coil spring 29 is rewound, so that the motor torque may be small. Therefore, there is no harm to set the pulse rate PPS in the first predetermined value PPS ₁ small motor torque.
Rather, by setting the first predetermined value PPS ₁ is a second predetermined value PPS ₂ is greater than the pulse rate, the rotational speed of the stepping motor 23 can be conducted at atmospheric, and the switching to the defroster mode quickly, practical It is more advantageous.

On the other hand, the moving direction of the film-like member 20 is
Carp when the direction is from the froster side to the face side
The direction in which the film spring 20 is wound.
Force for winding the coil spring 29 for movement (FIG.
T of 5₁) Is also required. Therefore, large motor torque
If not, the torque of the step motor 23 will be insufficient.
May be. Therefore, in the present embodiment,
When the direction is from defroster side to face side
Sets the pulse rate PPS to a first predetermined value PPS₁Smaller
Second predetermined value PPS_TwoBy setting
T_ATo T _BAutomatically increase and the torque is insufficient.
Occurrence can be prevented.

Next, in step S190, pulse energization of the step motor 23 (energization of the motor stator coil) is performed, and counting of the actually output pulse step number SP is started. Then, step S200
In step S14, the actual output step number SP is
It is determined whether the output step number SW (absolute value) has reached 0, and when SP = SW, the movement of the film-like member 20 for switching the blowing mode is completed.
Then, the pulse energization to the step motor 23 is stopped.

Next, in step S220, the film-like member 2
The number of steps SPp corresponding to the current position of 0 is expressed as SPp =
Update by the formula of SPp (previous value) + SW.

The motor torque characteristics shown in FIG. 11 use the starting characteristics A shown in FIG. 6 when the motor is started, and use the slewing characteristics B shown in FIG. 6 in the rotating state (steady operation state) after the motor is started. Then, it is preferable to switch the motor torque characteristics A and B. According to this, the adjustable range of the pulse rate PPS is expanded in the rotation state after the start of the motor is completed, and it is easy to achieve both the torque adjustment and the motor rotation speed adjustment.

(Second Embodiment) FIGS. 12 and 13 show a second embodiment, in which the pulse rate PP in the first embodiment is used.
The only difference is that step S230 is provided instead of steps S160 to S180 for determining S, and the other points are the same as in the first embodiment. FIG. 13 shows a method of determining the pulse rate PPS in step S230.

In step S130, the target step number SPo is determined corresponding to each blowing mode as in the first embodiment. The target number of steps SPo increases as the blowing mode shifts from the face mode to the defroster mode. In step S230, as shown in FIG. 13, the pulse rate PPS is increased or decreased in accordance with the increase or decrease of the target number of steps SPo.

That is, since the mode switching direction from the defroster side to the face side is the winding direction of the coil spring 29, the motor required torque increases as the moving distance of the membrane member 20 from the defroster mode position increases. The pulse rate PPS is gradually reduced in response to the increase in the required motor torque. Thereby, the film-like member 2
As the position of 0 shifts from the defroster mode position to the face mode side (the initialization position side in FIG. 13), the motor torque can be gradually increased.

When the blowing mode is switched from the face mode position side to the defroster mode side,
Since the pulse rate PPS is gradually increased, the motor torque gradually decreases as the mode shifts to the defroster mode.

When the blowing mode is switched from the face mode side to the defroster mode side, the coil spring 29 is in the rewinding direction, so that the membrane member 20 can be moved by the spring force of the coil spring 29. it can. Therefore, since the motor torque may be small, when the blow mode is switched from the face mode to the defroster mode, the pulse rate P is changed as shown by the broken line Z in FIG.
It is also possible to set PS to a uniformly large value so that the motor torque is always small and the motor rotation speed is always high.

(Third Embodiment) FIG. 14 shows a third embodiment. In the second embodiment, in step S230, the pulse rate PPS is changed to the target number of steps S for determining the blowing mode.
Although the pulse rate PPS is changed continuously according to Po, the pulse rate PPS is changed stepwise for each target step number SPo corresponding to each blowing mode in the third embodiment.

As a modification of the third embodiment, the pulse rate PPS may be changed stepwise every time the target number of steps SPo changes by a predetermined number (for example, 10 steps).

According to the first embodiment, as shown in FIG. 11, in the forward direction (spring winding direction) of the moving direction of the film-like member 20, the pulse rate PPS is always set to the smaller predetermined value PPS _2, and since the predetermined value PPS ₁ towards always greater the return direction (spring rewind direction), the pulse rate PPS in the moving direction of the Jo member 20, the moving direction of the forward direction of the film member 20 (spring tightening direction), Regardless of the position of the film-like member 20, the movement time of the film-like member 20 is uniformly increased.

On the other hand, according to the second and third embodiments, the pulse rate PPS is changed continuously or stepwise according to the movement of the position of the film member 20 (the absolute position with respect to the initialization position in FIGS. 13 and 14). To the film-like member 2
When the positions of 0 are the same, the pulse rate PPS becomes the same regardless of the reciprocation of the film-like member 20 in the moving direction. Therefore, at the same position of the film member 20, the rotation speed of the step motor 23 becomes the same regardless of the reciprocation of the film member 20 in the moving direction, and the movement time of the film member 20 (blowing mode switching time) is the same. Become.

As in the second and third embodiments, at the same position of the film-like member, regardless of the reciprocation in the moving direction of the film-like member,
The control characteristic that the moving time of the film-like member becomes the same is that the film-like member for air-mixing 13 is more effective than the film-like member for switching the blowing mode 20.
Applying to is more effective. That is, in the case of the film member 13 for air mixing, it is generally desired to make the film member moving time the same regardless of reciprocation in the moving direction (movement to the maximum cooling side or maximum heating side). .

In the first embodiment, a specific description of the driving mechanism of the air-mixing film member 13 is omitted, but the stepping motor 23 (not shown) is attached to the first driving shaft 11.
And a coil spring 29 is attached to the first driven shaft 12.
(Not shown), the movement of the air-mixing film-shaped member 13 is controlled by the rotational force of the step motor 23 and the spring force of the coil spring 29, similarly to the blow-off mode switching film-shaped member 20. it can.

Then, the air-mixing film member 13
Also in the case of (1), when the air-mixing film-shaped member 13 is moved in the direction of winding up (tightening) the coil spring 29, the pulse rate PPS is reduced to increase the motor torque. Conversely, when the air-mixing film-shaped member 13 is moved in the direction of rewinding the coil spring 29, the pulse rate PPS may be increased to reduce the motor torque and increase the rotation speed.

However, since the air-mix film 13 continuously controls the opening of the warm air passage 14 and the openings of the bypass passages 15 and 16, the moving direction of the air-mix film 13 is controlled. It is not necessary to set the winding direction and the winding direction of the coil spring 29 in a specific relationship.

(Fourth Embodiment) In the first to third embodiments described above, the case where the step motor 23 is used as the film member driving motor has been described. However, in the fourth embodiment, the film member driving motor is used. This is a case where a direct current (DC) motor 23 is used.

As shown in FIG. 15, there is a proportional relationship that the torque of the DC motor 23 increases as the voltage applied to the motor increases. For example, when a magnet type DC motor in which the field is constituted by permanent magnets is used as the DC motor 23, the torque changes as shown in FIG. 15 due to a change in the voltage applied to the armature coil.

Even when the DC motor 23 is of a type in which the field is constituted by an electromagnetic coil, the torque changes as shown in FIG. 15 due to a change in the motor applied voltage (voltage applied to the armature coil).

Accordingly, in the step corresponding to step 170 in FIG. 7 in the first embodiment, the voltage applied to the DC motor 23 is set to a lower first predetermined value V ₁ , and the step corresponding to step 180 in FIG. , DC motor 2
By controlling the applied voltage of No. 3 to a higher second predetermined value V ₂ , the torque of the DC motor 23 is reduced when the blowing mode switching film-shaped member 20 moves in the winding (winding) direction of the coil spring 29. It is automatically increased to prevent a shortage of torque due to the winding of the spring 29.

Next, FIG. 16 corresponds to FIG. 13 of the second embodiment, in which the voltage applied to the DC motor 23 is continuously changed in accordance with the position of the blow-off mode switching film member 20. Things. By adjusting the applied voltage of the DC motor 23, the same effect as in the second embodiment can be exerted.

Next, FIG. 17 corresponds to FIG. 14 of the third embodiment, in which the voltage applied to the DC motor 23 is changed stepwise according to the position of the blow-off mode switching film member 20. Therefore, the same effects as in the third embodiment can be exhibited.

Next, FIGS. 18 and 19 show the case where a DC motor 23 is used as a motor for driving the air-mixing film member 13. In the example of FIG. 18, the air-mixing film member 13 is in the maximum cooling position. Since the coil spring 29 is wound (tightened) when moving from the maximum heating position to the maximum heating position, the voltage applied to the DC motor 23 at the maximum heating position side of the film member 13 for air mixing is reduced. High.

In the example of FIG. 19, on the contrary, when the film member 13 for air mix moves from the maximum heating position to the maximum cooling position, the coil spring 29 is wound (tightened). Therefore, the voltage applied to the DC motor 23 is increased on the maximum cooling position side of the film member 13 for air mixing.

Next, FIGS. 20 and 21 correspond to FIGS.
19 corresponds to FIG. 19, in which the voltage applied to the DC motor 23 is changed stepwise according to the position of the film member 13 for air mixing. Here, in FIG. 20 and FIG.
Although the applied voltage of No. 3 is changed in two steps, the applied voltage of the DC motor 23 may be changed in three or more steps as shown in FIGS.

The DC motor has a characteristic that the rotational speed changes depending on the load fluctuation.
The expected characteristics are to secure the torque of the motor and the film-like member 1
When it is not possible to achieve both the reduction of the movement time of the motor 3 and the rotation time of the motor 20, the increase of the voltage applied to the DC motor 23 can achieve both the securing of the torque and the reduction of the movement time of the film member.

(Other Embodiments) In the above-described first to third embodiments, the blowing mode switching film-shaped member 20 moves in the mode switching direction from the defroster side to the face side (the winding direction of the coil spring 29). The step motor 23 is divided into a case where the stepping motor 23 moves and a case where the blowing mode switching film 20 moves in the mode switching direction from the face side to the defroster side (rewinding direction of the coil spring 29). Although the pulse rate PPS is switched, the pulse rate PPS may be switched between the automatic method based on the TAO described above and the manual method based on the manual operation of the occupant.

For example, in the case of the manual system in which the occupant operates manually, the pulse rate PPS is increased to further improve the mode switching speed. Thus, in the case of the manual system, the mode can be switched more quickly than in the case of the automatic system.

In particular, when the defroster mode is set in the manual mode, the maximum pulse rate PPS which is higher than any of the other mode settings may be set so that the defroster mode can be set quickly at the maximum speed. Good. According to this, after the occupant sets the defroster mode, the defogging function of the window glass can be instantaneously started by the defroster mode, and the front view of the vehicle can be quickly secured, which is advantageous for improving the safety of the vehicle. .

On the other hand, in the case of the auto system using TAO,
The pulse rate PPS is made smaller than in the case of the manual method to reduce the mode switching speed. Due to the decrease in the mode switching speed, in the case of the automatic method, the operation sound of the film member 20 can be reduced, and the timbre change of the operation sound of the film member 20 can be reduced. Therefore, the case of the automatic system is advantageous for quieting the interior of the vehicle.

In the first embodiment, the foot defroster mode and the foot defroster mode have been described only when the manual setting is performed manually. However, the foot defroster mode and the foot defroster mode are based on signals from a window glass fogging sensor, a vehicle interior humidity sensor, and the like. It is also possible to automatically set the foot defroster mode and the foot defroster mode by an automatic method.

In the first embodiment, as the elastic means connected to the second driven shaft 18, the hollow hole 18a of the second driven shaft 18 is used.
Although the coil spring 29 disposed inside is used, a spiral spring having an outer diameter larger than the outer diameter of the second driven shaft 18 and having a spiral wound shape can also be used. In this case, a mainspring is disposed outside the air-conditioning case 1, and one end on the inner peripheral side of the mainspring is directly or indirectly connected to one end of the second driven shaft 18 outside the air-conditioning case 1. Then, the spring force of the mainspring is
What is necessary is just to act on the driven shaft 18.

The vehicle air conditioner is provided with an inside / outside air switching door for switching between introduction of inside air and outside air, and the present invention can be similarly applied to a case where the inside / outside air switching door is formed of a film-like member.

In the above embodiment, the case where the present invention is applied to an air conditioner for a vehicle has been described. However, the present invention is not limited to an air conditioner for a vehicle, but can be widely applied to various uses as an air passage switching device. .

[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 a cross-sectional view of a main part of FIG. 2 in an enlarged disassembled state.

FIG. 4 is a cross-sectional view of the driven shaft portion of FIG. 3 in an enlarged assembled state.

FIG. 5 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. 6 is an operation characteristic diagram showing a relationship between a torque and a pulse rate of a step motor used in the present invention.

FIG. 7 is a flowchart illustrating a control example according to the first embodiment of the present invention.

FIG. 8 is an explanatory diagram of an initialization step in FIG. 7;

FIG. 9 is an explanatory diagram of a blowing mode determination step in FIG. 7;

FIG. 10 is a chart illustrating a relationship between a blowing mode and a target number of steps according to the first embodiment of the present invention.

FIG. 11 is an explanatory diagram of first and second pulse rates in the first embodiment of the present invention.

FIG. 12 is a flowchart illustrating a control example according to the second embodiment of the present invention.

FIG. 13 is an explanatory diagram showing a method of determining a pulse rate according to the second embodiment.

FIG. 14 is an explanatory diagram showing a method of determining a pulse rate according to a third embodiment of the present invention.

FIG. 15 is an operation characteristic diagram showing a relationship between torque and applied voltage of a DC motor used in a fourth embodiment of the present invention.

FIG. 16 is an operation characteristic diagram showing a control example of the applied voltage and the position of the blow-off mode film-like member of the DC motor according to the fourth embodiment.

FIG. 17 is an operation characteristic diagram showing another control example of the applied voltage of the DC motor and the position of the film member for the blowing mode.

FIG. 18 is an operation characteristic diagram showing an example of controlling the applied voltage of the DC motor and the position of the film member for air mixing.

FIG. 19 is an operation characteristic diagram showing another control example of the applied voltage of the DC motor and the position of the film member for air mixing.

FIG. 20 is an operation characteristic diagram showing another control example of the applied voltage of the DC motor and the position of the film member for air mixing.

FIG. 21 is an operation characteristic diagram showing another control example of the applied voltage of the DC motor and the position of the film member for air mixing.

FIG. 22 is an explanatory diagram of a basic configuration of a conventional technique.

[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
1, 17: drive shaft (first rotating shaft), 12, 18: driven shaft (second rotating shaft), 13: film member for air mixing,
20: membrane member for blowing mode switching, 23: step motor (driving means), 29 ... coil spring (elastic means), 31
... Air-conditioning control device.

Claims (10)

[Claims] A plurality of air passages (5) of a case member (1).
To 7 and 14 to 16).
0), one end of the film-like member (13, 20) is connected to a first rotating shaft (11, 17), and the film-like member (1
3, 20) is connected to a second rotating shaft (12, 18), and a driving step motor (23) is connected to the first rotating shaft (11, 17). An elastic means (29) is connected to the second rotating shafts (12, 18), and the first rotating shafts (11, 17) are rotationally driven by the stepping motor (23), so that the film-like member (1) is rotated.
3, 20) is connected to the first rotating shaft (11, 17).
When the second rotating shaft (12, 1
By the rotation of 8), the elastic means (29) is elastically deformed to increase the spring force, and the stepping motor (23) drives the first rotation shafts (11, 17) to rotate in the opposite direction, thereby One end of the membrane member (13, 20) is connected to the first rotation shaft (11, 20).
17) when unwound from the elastic means (29)
The second rotating shafts (12, 18) are rotated by the spring force of (2), and the other end of the film-like member (13, 20) is in the second position.
In the air passage switching device adapted to be wound around the rotating shafts (12, 18), when one end side of the film-like member (13, 20) is wound around the first rotating shaft (11, 17), A pulse rate which is the number of input pulses applied to the step motor (23) per unit time; and the other end of the film-like member (13, 20) is connected to the second rotation shaft (12, 18). A pulse rate, which is the number of pulses per unit time of an input pulse applied to the step motor (23) when being wound, is set so as to satisfy the relationship of the former pulse rate <the latter pulse rate. Air passage switching device. 2. A DC motor (23) is used in place of the step motor, and the DC when the one end side of the film-like member (13, 20) is wound around the first rotating shaft (11, 17). The voltage applied to the motor (23) is higher than the voltage applied to the DC motor (23) when the other end of the film member (13, 20) is wound around the second rotating shaft (12, 18). The air passage switching device according to claim 1, wherein 3. A plurality of air passages (5) of a case member (1).
To 7 and 14 to 16).
0), one end of the film-like member (13, 20) is connected to a first rotating shaft (11, 17), and the film-like member (1
3, 20) is connected to a second rotating shaft (12, 18), and a driving step motor (23) is connected to the first rotating shaft (11, 17). An elastic means (29) is connected to the second rotating shafts (12, 18), and the first rotating shafts (11, 17) are rotationally driven by the stepping motor (23), so that the film-like member (1) is rotated.
3, 20) is connected to the first rotating shaft (11, 17).
When the second rotating shaft (12, 1
By the rotation of 8), the elastic means (29) is elastically deformed to increase the spring force, and the stepping motor (23) drives the first rotation shafts (11, 17) to rotate in the opposite direction, thereby One end of the membrane member (13, 20) is connected to the first rotation shaft (11, 20).
17) when unwound from the elastic means (29)
The second rotating shafts (12, 18) are rotated by the spring force of (2), and the other end of the film-like member (13, 20) is in the second position.
In the air passage switching device adapted to be wound around the rotating shafts (12, 18), when one end of the film-like member (13, 20) is wound around the first rotating shaft (11, 17), The pulse rate, which is the number of input pulses applied to the step motor (23) per unit time, is determined by the elastic means (2).
9) An air passage switching device characterized in that the air passage switching device is gradually reduced in accordance with an increase in a spring force. 4. When a DC motor (23) is used instead of the step motor, and one end of the film-like member (13, 20) is wound around the first rotating shaft (11, 17), 4. The air passage switching device according to claim 3, wherein the voltage applied to the DC motor (23) is gradually increased in accordance with an increase in the spring force of the elastic means (29). 5. A plurality of air passages (5) of a case member (1).
To 7 and 14 to 16).
0), one end of the film-like member (13, 20) is connected to a first rotating shaft (11, 17), and the film-like member (1
3, 20) is connected to a second rotating shaft (12, 18), and a driving step motor (23) is connected to the first rotating shaft (11, 17). An elastic means (29) is connected to the second rotating shafts (12, 18), and the first rotating shafts (11, 17) are rotationally driven by the stepping motor (23), so that the film-like member (1) is rotated.
3, 20) is connected to the first rotating shaft (11, 17).
When the second rotating shaft (12, 1
By the rotation of 8), the elastic means (29) is elastically deformed to increase the spring force, and the stepping motor (23) drives the first rotation shafts (11, 17) to rotate in the opposite direction, thereby One end of the membrane member (13, 20) is connected to the first rotation shaft (11, 20).
17) when unwound from the elastic means (29)
The second rotating shafts (12, 18) are rotated by the spring force of (2), and the other end of the film-like member (13, 20) is in the second position.
In the air passage switching device wound around the rotating shafts (12, 18), the pulse rate, which is the number of input pulses applied to the step motor (23) per unit time, is determined by the film-shaped member ( 13. An air passage switching device, wherein the air passage switching device is changed according to the position of (13, 20). 6. A DC motor (23) is used instead of the step motor, and an applied voltage of the DC motor (23) is applied to the film-like member (1).
The air passage switching device according to claim 5, wherein the air passage switching device is changed according to the position of (3, 20). 7. The second rotary shaft (12, 18) has a shape having an axial hollow hole (18a), and the elastic means includes a hollow hole in the second rotary shaft (12, 18). (18
7. The air-path switching device according to claim 1, which is a coil spring (29) arranged in a). 8. A defroster air opening (5), comprising the air passage switching device according to any one of claims 1, 3, and 5, wherein the air passage blows conditioned air toward an inner surface of a vehicle interior windshield. A face air opening (6) for blowing conditioned air toward the upper body of the passenger in the passenger compartment, and a foot air opening (7) for blowing conditioned air toward the feet of the passenger in the passenger compartment. A face mode in which the film-like member (20) is opened, a face mode in which the defroster air opening (5) is opened, and a foot mode in which at least the foot air opening (7) is opened. The switching from the defroster mode side to the face mode side is performed by moving the film member (20) by the step motor (23). On the contrary, the switching from the face mode side to the defroster mode side is performed by moving the membrane member (20) by the spring force of the elastic means (29). 9. The switching between the face mode, the foot mode, and the defroster mode is performed by both an automatic method based on the determination of the air-conditioning control device (31) and a manual method based on the manual setting of the occupant. The vehicle air conditioner according to claim 8, wherein the pulse rate is set higher in the manual mode than in the auto mode. 10. The switching between the face mode, the foot mode, and the defroster mode is performed by both an automatic method based on a judgment of the air conditioning control device (31) and a manual method based on manual setting of an occupant. 9. The vehicle air conditioner according to claim 8, wherein when the defroster mode is manually set by the manual method, the pulse rate is set to be higher than when another mode is set. 10.