JPH07223425A - Door driving mechanism of automobile air conditioner - Google Patents

Abstract

PURPOSE:To provide a door driving mechanism of an automobile air conditioner which reduces and prevents noise caused when its door-driving actuator drives the door from being transmitted to the automobile interior, is made compact as a whole, and is excellent in heat radiation properties as well as in operating efficiencies. CONSTITUTION:A door-driving actuator comprises an ultrasonic motor M which is provided inside the air duct F of a unit case 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door drive mechanism for driving a door incorporated in a heater unit of an air conditioner for a vehicle.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a heater unit of an air conditioner for an automobile has an air passage F formed in a unit case 1 and blows various air flows through the air passage F. It is blowing from the exit. At this air outlet, there are a vent opening 2 for blowing cold air into the passenger compartment, a foot opening 3 for blowing warm air, and a defrosting opening 4 for clearing the cloud of the window.
Each of these openings has a ventilation door D, that is, a vent door D2.
, A foot door D3 and a differential door D4 are provided.
Each of the air distribution doors D is appropriately driven by a door drive mechanism 5 provided on the outer side portion of the unit case 1.

The door drive mechanism 5 includes door links L2, L connected to rotary shafts S2, S3, S4 of each air distribution door D.
3, L4 and pins P2, P3, P fitted in grooves M2, M3, M4 formed in these links L2, L3, L4.
4 and these pins P2, P3, P4 are branched links B2,
One drive link 6 provided at the tips of B3 and B4,
The drive link 6 has a motor actuator 8 to which a rotary shaft 7 is connected. By driving the motor actuator 8, the drive link 6 and the branch links B2, B3, B
4 and pins P2, P3, P4 through door links L2,
By operating L3 and L4, each air distribution door D is rotated by a predetermined angle.

[0004]

However, since the door drive mechanism 5 of such an automobile air conditioner is provided on the outer side portion of the unit case 1, the drive noise of the motor actuator 8 is generated in the vehicle interior. Since the motor actuator 8 itself drives the drive link 6 and the like via the speed reducer, the operating efficiency is not preferable and the heat dissipation of the motor actuator 8 is also a problem. Has become.

The present invention has been made in view of the above-mentioned problems of the prior art, and not only reduces the driving noise of the actuator itself but also prevents the driving noise from being transmitted to the vehicle interior, and the entire apparatus is compact. It is an object of the present invention to provide a door drive mechanism of an air conditioner for a vehicle, which is excellent in operating efficiency or heat dissipation.

[0006]

In order to achieve the above object, the present invention provides one or more air outlets in a unit case having an air passage through which an air flow is formed, and the air outlets are provided at the air outlets. A door driving mechanism of an air conditioner for an automobile, in which an air distribution door for controlling the air distribution of the air flow blown into the vehicle interior from the air outlet is provided, and the door is operated by an actuator. A door drive mechanism for an air conditioner for a vehicle, comprising an ultrasonic motor, wherein the ultrasonic motor is arranged on the air passage side of a recess formed in the side wall of the unit case.

[0007]

As described above, when the actuator is constituted by the ultrasonic motor and is provided in the air passage of the unit case, the driving noise of the actuator itself or the noise emitted from other portions (for example, the link portion) is directly generated in the vehicle interior. In addition, since the noise itself is reduced, quiet operation is possible, and since this ultrasonic motor generates high torque at low speed rotation, the door can be easily operated without using the speed reducer. It can operate, the operating efficiency is improved, and because this ultrasonic motor is extremely flat,
The entire device is made compact, the amount of protrusion from the unit case is reduced, and the number of parts is smaller than that of the conventional door drive mechanism, which is advantageous in terms of cost. Further, since the motor is cooled by the airflow flowing in the air passage of the unit case, it is advantageous in terms of heat dissipation.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a state where an ultrasonic motor portion of the embodiment is disassembled, and FIG. 3 is an exploded perspective view of the ultrasonic motor portion. 4 may be used in the description of FIG.

The door drive mechanism 10 according to this embodiment is shown in FIG.
As shown in, an ultrasonic motor M is used as an actuator, and the ultrasonic motor M is directly connected via a rotor 18 described later so that the air distribution door D is directly operated.
The ultrasonic motor M is arranged on the air passage F side of the recess 11 formed in the side wall 1a of the unit case 1, is provided in a stacked state with the rotor 18, and has an extremely small axial distance. There is.

As shown in FIG. 2, the ultrasonic motor M has a bracket 12 fixed to the side wall 1a of the unit case 1 by a screw B, and a center hole 13 of the bracket 12 is supported by a bearing 14. The bolt which is the rotating shaft 15 is inserted.

A piezoelectric element 16 which excites ultrasonic vibrations and a vibrating body 17 which is brought into pressure contact with the piezoelectric element 16 are attached to the bracket 12 with screws B, and these are the main driving sources of the ultrasonic motor M. Has become. This vibrator 1
A slider 19 formed on one side surface of a disk-shaped rotor 18 comes into contact with 7, and rotates in a direction opposite to a traveling wave of ultrasonic vibration applied to the vibrating body 17 by the piezoelectric element 16. ing.

The rotor 18 is a flat plate that is arranged perpendicularly to the rotary shaft 15 and is provided in the recess 11 together with the ultrasonic motor M in a stacked state. A cam groove 20 is formed on the other side surface of the rotor 18, and the rotation shafts S2, S3, S4 are formed in the cam groove 20.
The pins P2, P3, P4 provided at the tip of the air distribution door D rotatably supported by
When is rotated, all the doors D are opened and closed collectively. However, depending on the type of door, it is not always necessary to connect all the doors D to the end surface of the rotor 18, and the rotor 18 has the cam groove 20 formed on one surface as described above. Depending on the shape or position of the cam groove 20, the cam groove 20 may be formed so as to penetrate the rotor 18. If the rotor 18 is made of a material having a good heat transfer property such as copper or aluminum, the heat dissipation property of the rotor itself can be improved.

At the center of the other side surface of the rotor 18, a rubber 21, a disc spring 22, and a spring plate 2 are provided.
3 is tightened by a nut 24 screwed to the rotary shaft 15.

On the other hand, a rotational position detecting member 25 for detecting the rotational position is provided at the other end of the rotary shaft 15 so as to detect the rotational position of the rotor 18.
The rotation position detecting member 25 is a variable resistor used for, for example, a radio volume, and changes the voltage due to rotation in the circumferential direction, and determines the position based on the voltage value at an arbitrary position. ing. In other words, the rotational position detecting member 25 uses the fixed-side substrate 25a for the bracket 2
6 and fix the rotating side disk to the end of the rotating shaft 15,
The rotation side disk 25b is rotated by the rotation of the rotary shaft 15, and the position of the rotor 18 is detected by the voltage value detected by this.

Next, the operation of the above embodiment will be described. For example, when the air conditioner for a vehicle is set to the cooler mode for cooling operation by the controller in the vehicle compartment, the compressor and the evaporator are activated and the vent door D2 is in the open position and the other doors are in the closed position. It is driven by the door drive mechanism 5. Then, the cooled air flow circulates inside the air passage F of the unit case 1,
It is blown out into the vehicle compartment from the vent port 2 set to the "open" state.

In this door drive mechanism 5, the ultrasonic motor M
When an electric current is applied to the piezoelectric element 16, the ultrasonic vibration is excited, and the vibrating body 17 pressure-contacted with the piezoelectric element 16 is generated.
Are vibrated by ultrasonic vibration, and the rotor 18 rotates in a direction opposite to the traveling wave of the ultrasonic vibration of the vibrating body 17. This rotation position is detected by the rotation position detection member 25 attached to the rotation shaft 15, and the rotor 18 is set at a predetermined position.

Since the cam groove 20 is formed in the rotor 18, when the rotor 18 is set at a predetermined position, the pins P2, P3, P4 fitted in the cam groove 20 are formed.
Will also be moved to a predetermined position and set, whereby each air distribution door D is also set to an open state or a closed state. Therefore, the cooling air flow circulating in the air passage F of the unit case 1 has the vent port 2 in the “open” state.
Is blown into the passenger compartment from the other side, and is not blown out from other outlets.

As a result, the ultrasonic motor M provided in the air passage F operates while being cooled by the cooling air flow flowing in the air passage F, so that the motor does not overheat. The operating efficiency is also improved. In particular, since the ultrasonic motor M is provided in the concave portion of the air passage F, it does not become a passage resistance of the air flow flowing in the air passage F, and there is no fear that the air volume will be reduced.

Further, since this ultrasonic motor produces a high torque at a low speed rotation, the door can be easily operated without using a speed reducer or the like, and the axial length can be greatly shortened. , The entire device is also compact, and the amount of protrusion from the unit case is reduced.

Furthermore, since the link for driving the ultrasonic motor M and the door is provided in the air passage F of the unit case 1, the driving noise of the ultrasonic motor M itself is not directly transmitted to the passenger compartment. Extremely quiet operation is possible, and since the ultrasonic motor M is not moved by the force from the other when it is not operating, the door position may change due to the force from the air flow acting on the door. In order to prevent this, the link groove shape has been complicated in the past, but such a need is not necessary and the link groove shape can be simplified.

Further, since the pin provided on the door is directly moved by the groove provided on the rotor to rotate the door, the number of parts is smaller than that of the conventional link mechanism, the operation efficiency is improved, and the place where noise is generated. Also less.

The present invention is not limited to the above-described embodiments, but can be variously modified within the scope of the claims. For example, in the above-described embodiment, only the heater unit of the automobile air conditioner has been described, but the present invention is not limited to this, and the heater unit is attached to another unit, for example, the intake unit or the cooler unit, and the intake unit is installed. An ultrasonic motor may be used as a drive source for driving the door or the air mix door.

[0023]

As described above, according to the present invention, when the actuator is composed of the ultrasonic motor and is provided in the air passage of the unit case, the driving noise of the actuator itself or other parts is not transmitted to the vehicle interior. Moreover, since the noise itself is also reduced, quiet operation is possible, and since this ultrasonic motor produces high torque at low speed rotation,
The door can be easily operated without using a speed reducer, etc., and the operation efficiency is improved. Moreover, since this ultrasonic motor is extremely flat, the entire device is made compact, the amount of protrusion from the unit case is reduced, the number of parts is smaller than the conventional door drive mechanism, and it is also advantageous in terms of cost. Become. Further, since the motor is cooled by the airflow flowing in the air passage of the unit case, it is advantageous in terms of heat dissipation.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a state where an ultrasonic motor portion of the same embodiment is disassembled.

FIG. 3 is an exploded perspective view of the ultrasonic motor portion.

FIG. 4 is a schematic perspective view of a heater unit portion of a conventionally used automobile air conditioner.

[Explanation of symbols]

1 ... Unit case, 1a ... Side wall of unit case, 2, 3, 4 ... Air outlet, 11
... recesses, 18 ... rotors, 20 ... cam grooves, D ... air distribution doors, F ... air passages,
M ... Ultrasonic motor.

Claims (8)

[Claims] 1. One or more outlets (2, 3, 4) are provided in a unit case (1) in which an air passage (F) through which an air flow flows is formed, and the outlets are provided at the outlets. In the door drive mechanism of the air conditioner for automobiles, which is provided with an air distribution door (D) for controlling the air distribution of the air flow blown from the outlet into the vehicle compartment, etc., the actuator is It consists of an ultrasonic motor (M),
Install this ultrasonic motor (M) on the side wall of the unit case (1).
A door drive mechanism for an automobile air conditioner, characterized in that the door drive mechanism is arranged on the air passage (F) side of a recess (11) formed in (1a). 2. The ultrasonic motor (M) is a flat rotor.
The door drive mechanism according to claim 1, wherein (18) is rotated. 3. The rotor (18) has an air passage in the recess (11).
The door driving mechanism according to claim 2, wherein the door driving mechanism is arranged in the (F) side together with the ultrasonic motor (M) in a superposed state. 4. The door driving mechanism according to claim 2, wherein the rotor (18) is directly connected to the air distribution door (D). 5. The door drive mechanism according to claim 2, wherein the air distribution door (D) is driven by a cam groove (20) formed in the rotor (18). 6. The rotor (18) has the cam groove (2
The door drive mechanism according to claim 5, wherein (0) is formed. 7. The door drive mechanism according to claim 6, wherein the rotor (18) is provided with the ultrasonic motor (M) on the surface opposite to the side where the cam groove (20) is formed. 8. The door drive mechanism according to claim 2, wherein the rotor (18) is made of a heat conductive material.