JP3206070B2 - Vehicle air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening / closing device for opening and closing a ventilation opening by means of a membrane member.

[0002]

2. Description of the Related Art Conventionally, in a vehicle air conditioner, a film damper as shown in FIG. 5 has been used as a temperature adjusting means for adjusting the amount of air blown to a heater core, or as an outlet mode switching means for switching the mode of an outlet. Some adopt 100. The film damper 100 is disposed in parallel with a ventilation port 104 formed in a case 103 by two winding shafts 101 and 102, and the winding shaft 101 or 1
02 is translated along the ventilation opening 104 while being wound up. The film damper 100 has an opening (not shown) capable of opening the ventilation opening 104, and the position of the opening with respect to the ventilation opening 104 is displaced with the movement of the film damper 100. 104 is opened and closed.

[0003]

However, when the film damper is driven in a state where the blower is stopped, such as at the time of warm-up or manual push in an auto air conditioner, the friction between the film damper and the case is caused by friction between the film damper and the case. Occurs. Examination of the relationship between the noise (friction noise) caused by the rubbing of the film damper and the case and the operation speed of the film damper reveals that the noise increases as the operation speed of the film damper increases, as shown in FIG. The noise results shown in FIG. 6 are the film thickness, flexibility, and surface roughness (material), respectively.
These were measured with three types of film dampers (A film, B film, and C film) different from each other. As described above, when the blower is stopped, the friction noise between the film damper and the case is transmitted to the vehicle interior, and there is a possibility that the occupant may feel uncomfortable. The present invention has been made on the basis of the above circumstances, and an object of the present invention is to reduce noise when a film-shaped member is driven at the time of stopping air blowing.

[0004]

In order to achieve the above object, the present invention comprises a duct for guiding blast air into a vehicle cabin, and an opening / closing device for opening and closing a blast air vent provided in the duct. In the air conditioner for a vehicle, the opening / closing device includes two winding shafts rotatably supported, and both ends fixed to the respective winding shafts and arranged along the ventilation holes, A film-like member having an opening that opens the ventilation opening by being coincident with the ventilation opening, and a driving unit that rotationally drives the winding shaft, wherein the driving unit is configured to rotate the film when the blowing of the blowing air is stopped. When driving the film-shaped member, the rotation speed of the winding shaft is controlled such that the operation speed of the film-shaped member is smaller than the operation speed of the film-shaped member when the film-shaped member is driven during blowing. Is a technical measure.

[0005]

According to the opening / closing device of the present invention having the above-described structure, when the film-like member is moved in a state where the blowing is stopped by the driving means for rotatingly driving the winding shaft, the operating speed of the film-like member is reduced. The operation speed is controlled to be lower than the operation speed when the film-shaped member is moved while air is being blown. Therefore, the noise (friction sound) generated when the film-shaped member is driven when the blowing is stopped is lower than the noise (friction sound) generated when the film-shaped member is driven during the blowing.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a vehicle air conditioner according to the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of an air conditioner for a vehicle, and FIG. 2 is a perspective view of an opening / closing device.
The vehicle air conditioner 1 according to the present embodiment includes a unit case 2 (duct of the present invention) for guiding blast air into a vehicle interior, a blower 3 for generating an air flow in the unit case 2, and a unit case 2. Refrigerant cycle evaporator 4
And a heater core 5 using the engine cooling water as a heat source. At the downstream end of the unit case 2, a DEF outlet 6, a VENT outlet 7, and a FOOT outlet 8 are provided for blowing out blast air into the vehicle interior.

The temperature control of the blown air flowing in the unit case 2 and the switching of each of the outlets 6 to 8 (the vents of the present invention) are performed by a temperature adjusting means and an outlet switching means to which the switching device of the present invention is applied. It is performed by The temperature adjusting means adjusts the amount of air blown to the heater core 5, and is rotatably supported on the side wall of the unit case 2.
The winding shafts 9 and 10 of the book are wound at the opposite ends.
Flexible film damper 11 (the film-like member of the present invention) fixed to DC servo motor 1 for rotating winding shaft 9
2 (drive means of the present invention). Film damper 11
Is an opening (not shown) for letting air through
When the take-up shaft 9 is rotationally driven by the DC servo motor 12, the take-up shaft 9 slides between the take-up shafts 9 and 10, and the position of the opening is displaced to adjust the amount of air blown to the heater core 5. I do.

The outlet switching means comprises two winding shafts 13 and 14 rotatably supported on the side wall of the unit case 2 and flexible ends fixed at both ends to the winding shafts 13 and 14, respectively. Film damper 15 (film-like member of the present invention), winding shaft 13
, And a DC servo motor 16 (a driving means of the present invention) for rotating and driving, and two intermediate shafts 17 and 18 supporting the film damper 15. The film damper 15
It has an opening (not shown) for letting air through, and when the take-up shaft 13 is driven to rotate by the DC servo motor 16, the take-up shaft 1 is passed through the intermediate shafts 17 and 18.
By sliding between 3 and 14, the position of the opening is displaced, and the above-mentioned outlets 6 to 8 are selectively opened. In addition, the unit case 2 forming each of the outlets 6 to 8 includes:
A lattice portion 2a as shown in FIG. 2 is provided to prevent the film damper 15 from bending due to the wind pressure at the time of blowing.

The DC servo motor 12 and the DC servo motor 16 are connected via an air conditioner control device 19 (see FIG. 3) in accordance with a setting mode of a temperature setting lever (not shown) provided on a control panel of a driver's seat. Controlled. The air conditioner control device 19 is used when the film damper 11 or the film damper 15 is driven when the blower 3 is stopped under the operating condition in which the noise level in the vehicle interior is reduced (when the vehicle speed or the engine speed is small). In this case, the control is performed so that the voltage applied to the DC servomotor 12 or the DC servomotor 16 is smaller than when the blower 3 is operating.

Next, the operation of this embodiment will be described. In a state where the blown air is flowing into the unit case 2 by the operation of the blower 3, each of the film dampers 11 and 15 receives the wind pressure of the blown air and is pressed against the unit case 2 side. When each of the film dampers 11 and 15 is driven in a state where the blower 3 is operating, a friction sound is generated between each of the film dampers 11 and 15 and the unit case 2, but the operating sound or the blowing sound of the blower 3 is generated. There is no major problem with the generation of fricative noise. Next, when driving each of the film dampers 11 and 15 with the operation of the blower 3 stopped, the voltage applied to each of the DC servo motors 12 and 16 via the air conditioner control device 19 is reduced. Thereby, each DC servo motor 12, 16
As a result, the rotation speed of the take-up shaft, which is driven to rotate, decreases, so that the operating speed of each of the film dampers 11, 15 decreases. As a result, the friction noise caused by the rubbing between each of the film dampers 11 and 15 and the unit case 2 is reduced, and even when the operation sound of the blower 3 and the air blowing sound is not generated, the friction sound does not become a serious problem. There is no danger of discomfort to passengers in the room.

When the operation of the blower 3 is stopped and the wind pressure acting on each of the film dampers 11 and 15 disappears, the operating force for driving each of the film dampers 11 and 15 is reduced (see FIG. 4). ). Therefore, even if the voltage applied to each of the DC servo motors 12 and 16 is reduced, it is possible to sufficiently drive each of the film dampers 11 and 15. Further, by reducing the voltage applied to each of the DC servo motors 12 and 16, it is possible to obtain an effect that the operating noise of each of the DC servo motors 12 and 16 itself is also reduced.

In the above embodiment, the DC servo motor 12,
Although the motor speed is controlled by controlling the voltage applied to the motor 16, when speed control is performed at a duty ratio (pulse rate) such as an ultrasonic motor, the duty ratio is reduced by reducing the duty ratio. Also,
When a step motor is used, the speed of the motor can be controlled by increasing the generation speed of the pulse train (increase the frequency). Even when the speed of the motor is constant, it is possible to control the speed by switching the transmission mechanism on the side of the speed reducer driven by the motor.

When the noise level in the vehicle compartment is high (for example, when the vehicle speed and the engine speed are detected and the values are large), the operation of the blower 3 is stopped because the noise is not so noticeable. Even when the film dampers 11 and 15 are driven in the retracted state, it is not necessary to reduce the rotation speed of the winding shafts 9 and 13, and the speed-down operation may be canceled. Although the switchgear of the present invention is applied to both the temperature control means and the outlet switching means, it may be applied to only one of them. Alternatively, the present invention can be applied as inside / outside air switching means for switching between an inside air introduction port for introducing air into the unit case 2 and an outside air introduction port.

[0014]

According to the air conditioner for a vehicle of the present invention, the frictional noise is reduced by reducing the operating speed of the film-shaped member when the airflow is stopped, where the frictional noise is a problem, thereby reducing the discomfort to the occupant. be able to.

[Brief description of the drawings]

FIG. 1 is a sectional view of an air conditioner for a vehicle.

FIG. 2 is a perspective view of an opening / closing device.

FIG. 3 is a block diagram showing a configuration of the present embodiment.

FIG. 4 is a graph showing a relationship between a wind pressure and an operation force.

FIG. 5 is a cross-sectional view of a switching device for explaining a conventional technique.

FIG. 6 is a graph showing a relationship between an operation speed of a film damper and noise.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner for vehicles 2 Unit case (duct) 6 DEF outlet (vent) 7 VENT outlet (vent) 8 FOOT outlet (vent) 9, 10 Winding shaft 11 Film damper (membrane member) 12 DC servo motor (driving means) 13, 14 Winding shaft 15 Film damper (film-like member) 16 DC servo motor (driving means)

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/00 102 B60H 1/00 103

Claims (1)

(57) [Claims] 1. An air conditioner for a vehicle, comprising: a duct for guiding blast air into a vehicle cabin; and an opening / closing device for opening and closing a ventilation hole of the blast air provided in the duct. Two winding shafts supported by the shaft, and both ends fixed to the respective winding shafts, arranged along the ventilation opening, and an opening for opening the ventilation opening by being coincident with the ventilation opening. And a driving means for rotatingly driving the winding shaft. The driving means operates the film-shaped member when driving the film-shaped member when the blowing of the blast air is stopped. An air conditioner for a vehicle, wherein the rotation speed of the winding shaft is controlled such that a speed is lower than an operation speed of the film member when the film member is driven during blowing.