JP3417060B2 - Air passage switching device - Google Patents

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 air passages by moving a film-shaped member having an opening for allowing air to pass therethrough.

[0002]

2. Description of the Related Art As a conventional technique using the above-described air passage switching device in a vehicle air conditioner, for example, Japanese Patent Laid-Open No. 5-3.
The one disclosed in Japanese Patent No. 10029 is known. In this structure, both ends of a flexible film-shaped member such as a plastic film are wound around a drive shaft and a driven shaft that are rotatably provided in an air conditioning duct. A pulley is connected to each of the shafts coaxially with the shaft, and both ends of the thread member are wound around the pulleys. And on the drive shaft,
Drive means for rotating the drive shaft is connected.

When the drive shaft rotates in the direction of winding the film member, the drive shaft directly takes up the film member and the film member moves. On the contrary, when the drive shaft rotates in the direction of delivering the film-shaped member, the rotation of the drive shaft is transmitted to the driven shaft through the pulleys and the thread-shaped member, and the driven shaft rotates in the direction of winding the film-shaped member. -Shaped member is wound around the driven shaft,
Moving.

As described above, by constructing the film-like member so that it can be moved both forward and backward in the air-conditioning duct, the blow-out air passage into the vehicle interior can be freely changed.

[0005]

By the way, when a step motor is used as the driving means, the step motor operates based on a pulse signal output from the control device, so that a torque fluctuation corresponding to the pulse frequency occurs. , Emits a relatively large vibration. Then, the vibration of the step motor is transmitted to the drive shaft and further transmitted to the film-shaped member, so that the film-shaped member becomes a speaker having a vibration source, which causes a problem that vibration noise of the step motor is amplified.

As a result of the applicant's examination of the above problems, the following facts were found. That is, in the above-mentioned conventional air conditioner, since the drive shaft rotates with low resistance with respect to the air conditioning duct, some clearance is provided between the drive shaft and the air conditioning duct. Therefore, a space is provided in which the drive shaft can move when vibration is transmitted from the step motor to the drive shaft. Therefore, the drive shaft easily vibrates in the rotation axis direction and the radial direction due to the vibration from the step motor.

[0007] The present invention has been made in view of the above problems, in a film member of the opening for passing air is formed an air passage switching device for switching the air passage by moving in the air passage, a film member It is an object of the present invention to reduce the amount of noise generated from the film-shaped member due to the vibration of the driving means for moving the film-shaped member.

[0008]

In order to achieve the above object, the invention according to claim 1 is provided with an opening which is provided so as to cross the air passage and through which the air in the air passage passes. The flexible film-shaped member (12, 19), the first rotating shaft (10, 15, 21) that winds one end side of the film-shaped member (12, 19), and the film-shaped member (12, 1).
Second rotary shaft (11, 16, 2) for winding the other end side of 9)
2), a supporting means (2) for rotatably supporting the both rotary shafts, and the first rotary shaft (10, 15, 21), and the first rotary shaft (10, 15, 21). ) and a step motor (13, 20) for rotationally driving the front
In the rotation axis direction of the first rotation axis (10, 15, 21)
An elastic member (3) is provided between the end of the lever and the supporting means (2).
2) is provided, and the end portion of the elastic member (32) is
Being pressed against the supporting means (2) by elastic force
And said that you are.

Further, as described in claim 2, in the air passage switching device according to claim 1, the elastic member is a member.
Physically, it is better to use a sponge.

[0010]

[0011]

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

[0013]

According to the inventions of claims 1 and 2 ,
The flexible film-shaped member is provided so as to traverse the air passage when its both ends are wound around the first and second rotation shafts rotatably provided on the support means. Then, vinegar
When the step motor rotationally drives the first rotation shaft, the film member moves in the air passage, whereby the opening of the film member moves in the air passage, and the air passage is switched.

Here, even if the first rotating shaft tries to vibrate due to the vibration of the step motor , the first rotating shaft is elastic.
Since the elastic force of the member presses the support means, the first rotating shaft does not vibrate. Therefore, for the membrane member
Since the vibration from the step motor is hardly transmitted,
Generation of noise in the film member can be suppressed. In particular, the position of the first rotating shaft pressed by the support means is the first
Is an end portion of the rotation axis of the rotation axis direction. in this case,
Since the end portion is pressed against the support means in the rotation axis direction by the elastic force of the elastic member, vibration of the first rotation shaft in the rotation axis direction is suppressed. Further, vibration in the radial direction of the first rotating shaft is suppressed by friction between the end portion, the elastic member and the supporting means.

With the structure in which the end of the first rotating shaft is pressed against the supporting means in this manner, the first rotating shaft can be pressed against the supporting means without pressing the film-shaped member against the supporting means. .

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment in which the present invention is applied to a vehicle air conditioner will be described with reference to FIGS. The vehicle air conditioner in this embodiment includes a centrifugal fan 1a,
The blower 1 includes a drive unit (specifically, a blower motor, not shown) for driving the centrifugal fan 1a, and a blower case 1b for housing the centrifugal fan 1a.

An air conditioning duct 2 as an air passage for guiding the air from the blower 1 into the vehicle compartment is connected to the air downstream side portion of the blower 1. An evaporator 6 as a cooling means for cooling the air is provided in the air conditioning duct 2, and the evaporator 6 is provided at a downstream side of the evaporator 6.
A heater core 7 is provided as a heating means for heating the cold air from the.

The evaporator 6 is a heat exchanger which constitutes a well-known refrigeration cycle together with a compressor, a condenser and a pressure reducing means, and the heater core 6 is a heat exchange through which engine cooling water for cooling the engine flows. It is a vessel. Further, on the air downstream side of the air conditioning duct 2, a defroster outlet 3 for blowing the conditioned air toward the inner surface of the windshield, a face outlet 4 for blowing the conditioned air toward the upper body of the passenger in the vehicle compartment, and an air conditioner. A foot outlet 5 is formed for blowing air toward the feet of the occupant. By forming these outlets 3 to 5 in the air conditioning duct 2, conditioned air passes through the defroster outlet 3 in the air conditioning duct 2, conditioned air passes through the face outlet 4, and An air passage through which the conditioned air passes through the foot outlet 5 is formed.

In the air conditioning duct 2, a warm air passage 8 which is a passage through which the cool air from the evaporator 6 flows through the heater core 7,
A bypass passage 9 which is a passage through which the cool air from the evaporator 6 bypasses the heater core 7 is formed. Hot air passage 8
A drive shaft 10 as a first rotating shaft in the present invention is provided at the end of the rotatably rotatable with respect to the air conditioning duct 2 in the direction perpendicular to the plane of FIG. At the end of the bypass passage 9, a driven shaft 11 as a second rotating shaft in the present invention is provided rotatably with respect to the air conditioning duct 2 in a direction perpendicular to the plane of FIG.

A step motor 13 as a driving means in the present invention is connected to the drive shaft 10, and the drive shaft 10 is configured to rotate by the driving of the step motor 13. This step motor 13
Drive based on a pulse signal sent from a control device (not shown). The frequency of this pulse signal is 300 Hz.

Although not shown, both shafts 10, 1
A first pulley and a second pulley are connected to each of the pulleys 1, and both ends of a thread member (specifically, a wire) are wound around each pulley. The second pulley is rotatably provided with respect to the driven shaft 11, and the second pulley and the driven shaft 11 are connected by a spring means.

The specific structure of the pulleys, the wires, and the spring means as the rotation transmitting means for transmitting the rotation of the first rotating shaft to the second rotating shaft is as follows.
Since it is the same as the pulley, the wire, and the spring means (each of which will be described later) which is the rotation transmitting means on the side, detailed description thereof will be omitted. On the shaft 10, one end of a film door 12 as a film member according to the present invention is wound, and the other end of the film door 12 is wound on the shaft 11. The film door 12 is made of a flexible polyethylene resin, and is wound around the shafts 10 and 11 so that the warm air passage 8 can be maintained with a constant tension.
Further, it is stretched so as to cross the bypass passage 9.
The film door 12 is pressed against the heater core case 30 provided on the side surface of the heater core 7 by the tension.

Further, the film door 12 is formed with an opening (not shown) for allowing air to pass therethrough. When the film door 12 moves between the drive shaft 10 and the driven shaft 11, the opening is warmed. The ratio of opening the air passage 8 and the bypass passage 9 changes, and thereby the temperature of the conditioned air blown out from each of the air outlets 3 to 5 is adjusted.

Face outlet 4 in air conditioning duct 2
A drive shaft 15 as a first rotating shaft in the present invention is provided at an end of the blower 1 side so as to be rotatable with respect to the air conditioning duct 2 in a direction perpendicular to the plane of FIG. At the end of the foot outlet 5 in the air conditioning duct 2 on the heater core 7 side, a driven shaft 16 as a second rotating shaft in the present invention is rotatable with respect to the air conditioning duct 2 in the direction perpendicular to the plane of FIG. It is provided in.

A step motor 20 as a driving means in the present invention is connected to the drive shaft 15, and the drive shaft 15 is rotated by driving the step motor 20. This step motor 20
Drive based on a pulse signal sent from a control device (not shown). The frequency of this pulse signal is 300 Hz.

Further, guide roller shafts 17 and 18 are provided at intermediate positions between the defroster outlet port 3 and the face outlet port 4 in the air conditioning duct 2 and at intermediate positions between the defroster outlet port 3 and the foot outlet port 5, respectively. It is provided rotatably with respect to the air conditioning duct 2 in the direction perpendicular to the plane of the drawing. Further, as shown in FIG. 2, a first pulley 21 and a second pulley 22 are connected to each of the shafts 15 and 16, and each pulley has a thread-like member (specifically, a wire).
Both ends of 24 are wound. The second pulley 22
Is rotatably provided with respect to the driven shaft 16, and the second pulley 22 and the driven shaft 16 are spring means 2
5 (see FIG. 3).

The specific structures of the pulleys 21 and 22, the wire 24, and the spring means 25 will be described later. As shown in FIG. 1, one end of a film door 19 as a film member according to the present invention is wound around the drive shaft 15, and the other end of the film door 19 is driven shaft 1
It is wound on 6. The film door 19 is made of a flexible polyethylene resin, and has the above-mentioned both shafts 1
By being wound around 5, 16 it is stretched in a state of facing each of the outlets 3 to 5 with a constant tension.

As shown in FIG. 2, the film door 19 is formed with openings 19a and 19b through which air can pass, so that the film door 19 can move between the drive shaft 15 and the driven shaft 16. By opening 1
The state in which 9a and 19b open and close the defroster outlet 3, the face outlet 4, and the foot outlet 5 is changed, whereby the outlet mode is selectively determined.

A cold air bypass door 14 is provided at the upper portion of the driven shaft 11 in the air conditioning duct 2 in FIG. 1 so as to be rotatable between a solid line position and a two-dot chain line position. . This door 14 moves to the position of the chain double-dashed line during maximum cooling, and guides the cool air from the evaporator 6 to the face outlet 4. Next, the first pulley 21 and the second pulley 2
2, the specific configurations of the wire 24 and the spring means 25 (see FIG. 3) will be described with reference to FIG. The contents described below are the drive shaft 10 and the driven shaft 1.
1, a first pulley, a second pulley, a wire,
And the structure of the spring means.

As shown in FIG. 2, at one end of the drive shaft 15, a hole 15a having a D-shaped cross section is formed.
The shaft portion 21a having a D-shaped cross section of the first pulley 21 is fitted into the hole portion 15a. A hole 21b having a D-shaped cross section is formed at the center of the first pulley 21, and a shaft 20a (see FIG. 3) of the step motor 20 having a D-shaped cross section is formed in the hole 21a. It is fitted.

A second pulley 22 is connected to the driven shaft 16 via a connecting shaft 23 which is a separate component from the second pulley 22, and a wire 24 as a thread member is hung between the pulleys 21 and 22. It has been passed. Therefore, when the drive shaft 15 and the first pulley 21 are rotated in the direction A in FIG.
9 is wound by the drive shaft 15. At this time, the film shaft 19 is wound around the drive shaft 15, so that the driven shaft 16 and the second pulley 22 rotate in the direction A in FIG. And the second pulley 2
The second pulley 22 winds the wire 24 by rotating 2 in the A direction.

On the contrary, when the drive shaft 15 and the first pulley 21 are rotated by the step motor 20 in the direction opposite to the direction A in FIG.
Wind up 4. As a result, the second pulley 22 and the driven shaft 16 rotate in the direction opposite to the A direction, and the driven shaft 16 winds up the film door 19. Further, the end portion of the connecting shaft 23 on the driven shaft 16 side is formed in a substantially D-shaped cross section, and this end portion is inserted into a hole portion 16a formed in the end surface of the driven shaft 16 and having a substantially D shaped cross section. By doing so, the connecting shaft 23 is prevented from rotating with respect to the driven shaft 16. Further, an engaging claw (not shown) is formed at the end of the connecting shaft 23, and the connecting shaft 23 is provided with a hole 16a.
When it is inserted into the connector, the engaging claw is engaged with the engaging hole 16b to prevent the connecting shaft 23 from coming off.

The portion of the connecting shaft 23 on the second pulley 22 side is inserted into a hole 22a formed at the center of the second pulley 22. The diameter of the hole 22a is equal to the diameter of the connecting shaft 23.
The diameter of the second pulley 22 is slightly larger than the diameter of the second pulley 22 side of the connecting shaft 2.
It is rotatable with respect to 3. Further, one end of spring means such as a coil spring 25 is fixed to the second pulley 22, and the other end of the coil spring 25 is fixed to the connecting shaft 23. As a result, the rotation of the driven shaft 16 is transmitted to the second pulley 22 via the coil spring 25, and the rotation of the second pulley 22 is transmitted to the driven shaft 16 via the coil spring 25. The coil spring 25 includes the driven shaft 16, the film door 19, the drive shaft 15, the first pulley 21, the wire 24, the second pulley 22, and the coil spring 2.
It has a function of always applying a constant tension to the mechanism formed by 5.

Next, the shafts 15 and 16, the film door 19, the step motor 20, and the pulleys 21 and 2 described above.
2 and the assembly structure of the wire 24 to the air conditioning duct 2 will be described with reference to FIG. 3 shows the air conditioning duct 2
It is the sectional view which looked at what assembled the above 15, 16, 19, 20-22, and 24 respectively to air from the air upstream side to the down stream side.

As shown in FIG. 3, the shaft portion 31a of the bearing bush 31 made of resin is press-fitted into the hole 2a formed in the air conditioning duct 2. Then, the shaft portion 31a has a donut-shaped elastic member (specifically, a sponge) 32.
And the hole 15b formed at the center of the drive shaft 15 is loosely fitted. A shaft portion 21a of the first pulley 21 is loosely fitted in a hole portion 2b formed in the air conditioning duct 2, and the shaft portion 21a is fitted in a hole portion 15a of the drive shaft 15.

Further, the air conditioning duct 2 has three columnar projections 2e (only two of which are shown in FIG. 3) formed integrally with the air conditioning duct 2, and the step motor 20 has the columnar projections 2e. It is fixed to the protrusion 2e with a screw 33. Further, the shaft portion 20a of the step motor 20 is the first
It is fitted into the hole 21b of the pulley 21. The motor built-in portion 20b of the step motor 20 is not shown in cross section.

Further, the hole 2c formed in the air conditioning duct 2
The shaft portion 34a of the bearing bush 34 made of resin is press-fitted into the shaft. A hole portion 16c formed at the center of the driven shaft 16 is loosely fitted in the shaft portion 34a. A connecting shaft 23 is loosely fitted in a hole 2d formed in the air conditioning duct 2, and an end of the connecting shaft 23 is fitted in a hole 16a of the driven shaft 15.

Both ends of the wire 24 are attached to the first pulley 21.
And the second pulley 22 respectively. The second pulley 22 and the connecting shaft 23 are connected via a coil spring 25. The coil spring 25 is not shown in cross section. The film door 19 is not shown because it is on the front side of the paper surface of FIG. Next, the drive shaft 15, the first pulley 21, and the step motor 20.
The order of assembling the air-conditioning duct 2 will be briefly described.
The air conditioning duct 2 has a structure that can be divided into the right half and the left half of FIG.

First, the shaft portion 31a of the bearing bush 31 is press-fitted into the hole portion 2a formed in the right half of the air conditioning duct 2, and then the sponge 32 and the drive shaft 15 are inserted into the shaft portion 31a. Then, the shaft portion 2 of the first pulley 21 is inserted into the hole 2b formed in the left half of the air conditioning duct 2.
1a is inserted, and in that state, the shaft portion 21a is fitted into the hole portion 15a of the drive shaft 15, and the left half of the air conditioning duct 2 is fixed together with the right half. After that, the shaft portion 20a of the step motor 20 is attached to the first pulley 21.
Step motor 2 so that it fits into the hole 21b of
0 is fixed to the columnar protrusion 2e .

Here, the step motor 20 is replaced with a columnar protrusion.
By being fixed to 2e , the first pulley 21 is pushed rightward in FIG. 3 by the step motor 20, and the drive shaft 15 is pushed rightward by the first pulley 21. Then, the force of the drive shaft 15 trying to move to the right is absorbed by the sponge 32, and as a result, a close contact force is obtained between the drive shaft 15 and the right half of the air conditioning duct 2.

As described above, by providing an adhesion force between the right end portion of the drive shaft 15 in FIG. 3 and the air conditioning duct 2, even if a pulse signal is output from the step motor 20 and the step motor 20 vibrates. The vibration in the direction of the rotation axis of the drive shaft 15 (left-right direction in FIG. 3) due to this vibration is suppressed. In addition, the drive shaft 15 and the sponge 32
Due to the frictional force between the drive shaft 15 and the sponge 32 and the air conditioning duct 2, the radial vibration of the drive shaft 15 due to the vibration of the step motor 20 is suppressed.

Since the vibration of the drive shaft 15 in the rotational axis direction and the axial direction is suppressed as described above, the vibration of the film door 19 is suppressed. Therefore, it is possible to prevent a problem that a large noise is generated from the film door 19 due to the vibration of the step motor 20.
Here, experimental data of frequency and noise in the case where there is a gap between the drive shaft 15 and the air conditioning duct 2 as in the prior art is shown in FIG. 4A, and the drive shaft 15 as in the present embodiment is shown. Between the air conditioning duct 2 and the sponge 32
FIG. 4 shows experimental data of frequency and noise in the case where the drive shaft 15 and the air conditioning duct 2 are closely attached by providing the
It shows in (b).

As can be seen from FIG. 4, the noise from the film door 19 at a frequency of 300 Hz which is the same as the frequency of the step motor 20 (shown by a white circle in FIG. 4).
However, it can be seen that it is reduced to 29.21 (dB) in the present embodiment, while it is 41.32 (dB) in the above-mentioned related art. Further, in this embodiment, the drive shaft 15
Since an elastic member such as a sponge is provided between the air conditioning duct 2 and the air conditioning duct 2, the adhesion force applied between the drive shaft 15 and the air conditioning duct 2 does not become so large and has an appropriate size. Therefore, the operating force for operating the drive shaft 15 can be set to an appropriate magnitude. Of course, this operating force is less than or equal to the motor torque of the step motor 20.

Next, a second embodiment of the present invention will be described. As shown in FIG. 5, an elastic piece 2f is provided in the hole 2b portion of the air conditioning duct 2, and the first pulley 21 has the elastic piece 2f.
It may be pressed down by the elastic force of.
In this case, the vibration of the first pulley 21 in the left-right direction in FIG. 5 is suppressed by the frictional force between the elastic piece 2f and the first pulley 21. Therefore, the vibration of the drive shaft 15 in the rotation axis direction is suppressed. Further, the vibration of the first pulley in the radial direction in FIG. 5 is suppressed by the elastic force of the elastic piece 2f. Therefore, vibration in the radial direction of the drive shaft 15 is suppressed.

Also in this embodiment, the sponge 32 may or may not be provided between the drive shaft 15 and the air conditioning duct 2 as shown in FIG. The present invention can also be made to be explained below. For example,
In the rotation axis direction, the dimension of the drive shaft 15 is set to be slightly larger than the dimension of the air conditioning duct 2. As a result, both ends of the drive shaft 15 are directly pressed by the air conditioning duct 2. Even in this case, the vibration of the drive shaft 15 in the rotational axis direction and the radial direction can be suppressed. Of course, also in this embodiment, the operating force of the drive shaft 15 is set to be smaller than the motor torque of the step motor 20.

In addition, the driven shaft 16 is pressed against the air conditioning duct 2 via an elastic member, or the driven shaft 16 is directly pressed against the air conditioning duct 2. By doing so, the effect of reducing the noise from the film door can be more exerted than the configuration of each of the above-described embodiments. In this case, the adhesion force between the driven shaft 16 and the air conditioning duct 2 is set to such a value that the function of the coil spring 25 described above can be satisfactorily exhibited.

Alternatively, instead of the sponge 32, a coil spring, a leaf spring, a felt or the like having elasticity may be used.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram in a first embodiment of the present invention.

FIG. 2 is a perspective view showing a part of the above embodiment.

FIG. 3 is a cross-sectional view showing the main parts of the above embodiment.

FIG. 4 is comparison data in terms of noise between the above-described embodiment and the conventional technique.

FIG. 5 is a partially enlarged view of another embodiment of the present invention.

[Explanation of symbols]

2 Air conditioning duct (supporting means) 2f elastic piece 10, 15 Drive shaft (first rotation axis) 11,16 Driven shaft (second rotary shaft) 12, 19 Film door (Membrane member) 13, 20 step motor (driving means) 21 1st pulley (1st rotating shaft) 22 Second pulley (second rotating shaft) 32 Sponge (elastic member)

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-5-310029 (JP, A) JP-A-60-226316 (JP, A) JP-A-4-87826 (JP, A) JP-A-5- 33997 (JP, A) JP 64-85809 (JP, A) JP 5-296553 (JP, A) JP 5-213047 (JP, A) JP 5-157345 (JP, A) JP-A-5-231707 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B60H 1/00 102 B60H 1/00 103 B60H 1/00 101 F24F 13/10

Claims (2)

(57) [Claims] 1. A flexible film-shaped member which is provided so as to cross an air passage and has an opening for allowing the air in the air passage to pass therethrough, and one end of the film-shaped member is wound up. No. 1 rotation shaft, a second rotation shaft that winds the other end side of the film-shaped member, a support unit that rotatably supports both rotation shafts, and a first rotation shaft connected to the first rotation shaft. A step motor for rotationally driving the first rotary shaft, and an end portion of the first rotary shaft in the rotary shaft direction and the support.
An elastic member is provided between the end portion and the elastic member.
The elastic force of the elastic member presses against the supporting means.
An air passage switching device, characterized in that are. 2. The air passage switching device according to claim 1 , wherein the elastic member is a sponge .