JPH087301Y2 - Motor mounting structure for air conditioning outlet - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a noise countermeasure of a motor mounting structure for an air conditioning outlet.

[0002]

2. Description of the Related Art An air conditioning outlet is provided with a swing louver type outlet for automatically and periodically changing the blowing mode of the conditioned air blown from an air conditioner. In this swing louver, the fins for changing the direction of the wind arranged at the outlet are swung by the drive device arranged behind it, so that the noise of the motor and gear mechanism of the drive device is muffled in the case, which causes muffled sound. There is a problem that the noise is increased and the indoor noise is increased.

[0003]

In order to prevent this noise, it is sufficient to seal the noise-causing drive device in the case so that no noise is produced. Have difficulty. SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a motor mounting structure in which the sound of the driving device is not muffled and the sound is less likely to be emitted to the passenger compartment width side.

[0004]

The present invention has a structure in which a drive mechanism operated by a motor is inserted and mounted in a box-shaped case provided at the back of an air-conditioning outlet and having an open front surface. The air-conditioning outlet motor mounting structure is characterized in that a breathable foam elastic material layer is provided at least on the inside of the rear rear surface of the above, and a large number of holes are provided on the rear surface of the case.

[0005]

According to the present invention, a large number of holes are provided on the back surface of the case to allow the motor to radiate heat. However, since the foam elastic material layer with air permeability is provided on the inner surface of the back surface, noise is absorbed. The emission to the outside of the case is reduced. Further, by eliminating the muffled sound in the case, the noise is less likely to appear in the width of the passenger compartment on the side where the occupant is present, and the noise felt by the occupant is reduced. Further, since the air blown from the rear of the case passes through the breathable foam layer, heat dissipation of the motor and the like is promoted. The foam elastic material layer is provided on the inner surface of the case so as to cover most of the motor,
Furthermore, the indoor transfer of noise is suppressed.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to specific examples shown in the accompanying drawings. FIG. 1 is a front view of an air outlet of an air conditioner for an automobile. Two columns 5 and 6 extending vertically are provided on a front surface of a louver housing 1 at predetermined intervals, and three outlets are provided. It is divided into balloon parts 2, 3 and 4. Two upper and lower horizontal fins 8 and 9 extending substantially horizontally are arranged in the outlets 2, 3 and 4, respectively, and three fins 11 extending substantially vertically in the space behind the horizontal fins 8 and 9, 1
2 and 13 are arranged. In addition, 10 is an operation knob.

The vertical fins 11, 12 and 13 are swingably supported by a link member 21.
1, a drive arm 22 extending rearward is provided, and a rear end portion of the arm 22 has an electric motor 26 and a power transmission mechanism 2
7, the eccentric crank pin 24 of the circular crank plate 25 connected to the electric motor 26 is engaged with the elongated hole 22a formed at the rear end of the drive arm 22. The vertical fins 11, 12, 13 are swung.

As shown in FIG. 3, the motor case 30 is composed of a rear case 31 for accommodating the drive mechanism and a front case 32 into which the drive arm 22 projects. The front case 32 is fixed to the louver housing 1. The convex portion 33 located around the opening is fitted into the concave portion 34 located at the front end of the rear case 31 to be assembled. As shown in FIGS. 4 and 5, a round hole 36 or a square hole 36 'is formed on the rear surface of the rear case 31, and a urethane foam 35 is attached to the inner surface of the rear surface. On the other hand, as shown in FIG. 6, a required number of urethane foam bodies 37 are attached to the electric motor 26 and the power transmission mechanism 27 so as to cover the main parts thereof, and the urethane foam bodies 37 are housed in the rear case 31 and stored in the front case 32. (See Fig. 7).

In the present invention, when the air conditioner is operated while the swing louver is operated and the noise value thereof is observed at a position of 10 cm in front of the outlet, the hole 36 and the foam 3 are observed.
It is observed that the noise value decreases compared to the case where no noise countermeasure is taken in 5, and the decrease rate is large especially in the frequency range where noise is easily felt at 2.5 to 5 kHz (see FIG. 8).

[Brief description of drawings]

FIG. 1 is a front view of an air outlet of an automobile air conditioner.

FIG. 2 is a cross-sectional view of essential parts showing the rear of the horizontal cross section of FIG.

FIG. 3 is a vertical sectional view of a motor case.

[Fig. 4] Rear view of the motor case

FIG. 5 is a rear view of another motor case.

FIG. 6 is a side view of the drive device.

FIG. 7 is a vertical cross-sectional view of a motor case showing a state in which the drive device of FIG. 4 is housed.

FIG. 8 is a graph showing the measurement result of the noise value of each example.

[Explanation of symbols]

 21 Link Member 22 Drive Arm 26 Electric Motor 27 Power Transmission Mechanism 30 Motor Case 35 Foam 36, 36 'Vent Hole

Claims (1)

[Scope of utility model registration request] 1. A structure in which a drive mechanism operated by a motor is inserted and mounted in a box-shaped case provided at the back of an air-conditioning outlet and having an open front surface, and at least the inside of the back surface of the case is breathable. A motor mounting structure for an air-conditioning blow-out port, characterized in that a foam elastic material layer having a certain shape is provided and a large number of holes are provided on the back surface of the case.