JPH0347500A - Installing structure of blower motor - Google Patents

Abstract

PURPOSE:To reduce a noise by making an installing hole, through which a blower motor is inserted, at the place facing a suction port of a blower case, placing a suitable number of installing stays at the outer periphery of the blower motor at a prescribed interval and in a radially projected manner, providing a resin-made closing member, which covers the stays and closes the installing hole, and arranging a cushion material for vibration-proofing and sealing between the closing member and the installing stays. CONSTITUTION:A suitable number of installing stays 15 made of steel plate etc. are placed at the outer periphery of a blower motor 4 at a certain distance in a projected manner, and a motor 4 is fixed to a blower case 2 by using a screw. The installing stays 15 are given the strength and quantity sufficient enough for supporting the motor 4, and the total surface area of the stays 15 is made minimum, so that the vibration transmitted from the motor 4 can be lessened. A closing member 20, which is used to close an installing hole 10, is circular and possesses a grooves 22, which correspond to each stay 15. The member 20 is screwed to the case 2, and a cushioning material 16 for vibrationproofing and sealing is arranged between the closing member 20 and the stay 15. The closing member 20 is made up of resin, which hardly transmits the vibration. With this contrivance, both vibration and noise can be reduced.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention mainly relates to a blower used in a vehicle air conditioner,
In particular, the mounting structure of the blower motor is designed to reduce noise.

(Prior Art) In this type of blower, the blower motor for driving the blower has a mounting hole in the blower case and is inserted into the blower case, and serves both of the purpose of blocking this mounting hole and supporting the blower motor. It can be attached by screwing a flange (fixed to the outer circumference of the blower motor) to the blower case via a shock absorbing material that also serves as a vibration isolator and a seal (see, for example, Japanese Utility Model Publication No. 63-41600). (Problem to be Solved by the Invention) However, the above-mentioned flange is formed of a metal disk, and as the blower motor is driven, the vibrations thereof are amplified like a speaker and generate noise. Ta.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a blower motor mounting structure that can reduce blower noise and improve air conditioning feeling.

(Means for Solving the Problems) In order to achieve the above object, a blower motor mounting structure according to the present invention includes a blower motor that is inserted into a blower case having an inlet and an outlet at a position facing the inlet. In addition to opening a mounting hole, the outer circumference Q of the blower motor is
An appropriate number of mounting stays for attaching the blower motor are provided, each protruding radially at a predetermined interval, and a closing member is provided to cover the mounting stay and close the mounting hole, and the closing member is made of a resin material. The blower case is molded with a shock absorbing material for vibration isolation and sealing between the mounting stay and the blower case.

(Function) Therefore, the part corresponding to the conventional flange is separated into a mounting stay that supports the blower motor and a closing member that closes the mounting hole, and the mounting stay has sufficient strength to support the blower motor and its area It is formed in a radial shape to minimize the vibration, which reduces the number of parts that vibrate, and since the closing member is molded from a resin material, it is difficult for vibration to be transmitted compared to a flat metal plate, etc. The above problem is solved by suppressing noise.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, the blower 1 is constructed by housing a blower motor 4 equipped with a blower fan 3 in its blower case 2, and rotates the blower fan 3 by driving the blower motor 4, and rotates the blower fan 3 through the suction port 6. The air sucked in is blown out from the blow-out lower.

The blower case 2 is made of, for example, resin, and has an air inlet 6 at the bottom, a blowout lower at the side, and a mounting hole 10 for inserting the blower motor 4 at the top. . A screw hole 11 for screwing a mounting stay 15 of the blower motor 4, which will be described below, and a boss portion 12, for screwing a closing member 20, which will be described later, are provided on the periphery of the mounting hole 10, respectively.

The blower motor 4 has a blower fan 3 rotatably fixed to a drive shaft (not shown), and an appropriate number of J stays 15 protruding from a predetermined distance apart from an iron plate or the like on the outer periphery. This mounting stay 15 is fixed to the blower motor 4 by, for example, spot welding, and by aligning the screw fixing notch 15a formed at the tip with the screw hole 11 of the blower case 2, The blower motor 4 is fixed to the blower case 2. Here, the mounting stays 15 are set to have sufficient strength and number to support the blower motor 4, and are set so that the total area thereof is minimized. configured.

That is, by making the area smaller, vibrations transmitted to the blower motor 4 are reduced.

A closing member 20 described below is attached to the blower case 2 to which the blower motor 4 is attached via the above-mentioned attachment stay 15 in order to close the attachment hole IO.

The closing member 20 is approximately disk-shaped, and has an insertion hole 21 in the center that matches the shape of the blower motor 4, a groove 22 that corresponds to each mounting stay 15 in the radial direction, and a screw fixing hole in a part of the circumference. A protrusion 23 for use is formed in each case. This closing member 20 is configured such that the blower motor 4 is inserted into the insertion hole 21 and each protrusion 23 is aligned with the boss portion 12 of the blower case 2 and screwed. A cushioning material 16 for shaking and sealing is provided.

Here, the closing member 20 is made of a material that is difficult to transmit vibrations caused by the drive of the blower motor 4 (for example, has an extremely low elastic modulus), and is molded from a resin material in consideration of its strength and light weight. . Further, the cushioning material 16 is molded with a material such as urethane in order to absorb vibrations of the mounting stay 15 and the closing member 20 and to tightly seal between the mounting hole 10 of the blower case 2 and the closing member 20. has been done.

Next, how noise is reduced by the mounting structure of the blower motor 4 as described above will be explained with reference to FIGS. 3 and 4.

FIG. 3 is an example of data obtained by measuring the noise generated when a supporting member (the mounting stay 15 in the present invention, a conventional metal molded flange in the conventional case) is fixed to the blower motor 4 and is driven by itself. It is. As shown in FIG. 3, the conventional noise level, 7) (about 32-39
B] is a high level, whereas in the present invention, it is about 26~
Noise is suppressed to a low level of 29 [dB]. When comparing the highest values, a difference of 10 [dB] appears.

This is because the conventional flange-shaped support member is a metal disc and has a large area, so vibrations of the blower motor 4 are transmitted widely and noise increases, whereas the support member of the present invention (
Since the area of the mounting stay 15) is set to be small, the transmission of vibrations of the blower motor 4 is reduced.

Next, the noise level when the blower motor 4 is attached to the blower case 2 and driven will be compared using FIG. 4. In the present invention, the blower motor 4 is attached as shown in FIG. 1, and in the conventional method, the blower motor 4 with a fixed flange is placed between the blower case 2 and a shock absorbing material for vibration isolation and sealing. I installed it and carried out each. However, the blower fan 3 is not attached to the blower motor 4 in both cases. As shown in Fig. 4, while the conventional noise level is at a high level of about 33 to 37 [C+B], the noise level of the present invention is about 31 to 37 [dB], which is a difference of 3 [dB] at the highest value. It is kept low at 34 [dB]. This is because the mounting structure of the present invention not only reduces noise by the above-mentioned mounting stay 15, but also molds the closing member 20 combined therewith with a resin material to which vibrations are difficult to be transmitted.

Therefore, as described above, the mounting stay 15 and the closing member 2
By combining the blower 1 with 0 and configuring the blower 1 to be less susceptible to vibration, noise can be suppressed compared to the conventional blower 1, and the blower 1 is quieter. In addition, the mounting stay 15 and the closing member 20
The difference in the vibration modes of the two causes mutual interference, resulting in further noise attenuation. Furthermore, since the closing member 20 is molded from a resin material, the weight of the blower 1 as a whole is reduced.

Note that the mounting stay 15 according to the present invention is not limited to the above-mentioned shape, but may have a shape as shown in FIG. 5, for example.

In the mounting structure shown in FIG. 5, an annular mounting stay 15 is fixed to the blower motor 4, and screw holes 15b formed on the periphery of the stay 15 are aligned with screw holes 11 formed on the blower case 2. Therefore, the blower motor 4
is attached to blower case 2. On the other hand, the closing member 20 is connected to the screw hole 15 of the mounting stay 15.
A screw relief groove 24 is formed in accordance with the position b, and a screw fixing hole 23 is formed, and this screw fixing hole 23 is connected to the screw through hole 15c formed in the mounting stay 15 and the screw of the blower case 2. It can be attached to the blower case 2 by aligning it with the hole 13 and disposing the buffer material 16 between it and the mounting stay 15 and screwing it. Therefore, similarly to the first embodiment, the blower motor 4 is connected via the mounting stay 15.
is attached to the blower case 2, a cushioning material 16 is interposed from above as shown in the figure, and the blower case 2 is closed by the closing member 2o.
The mounting structure is such that the mounting stay 15 has a small area and the closing member 20 is molded from a resin material, thereby achieving the same effect as the first embodiment.

(Effects of the Invention) As described above, according to the present invention, the part that supports the blower motor is constructed of a mounting stay with a reduced area, and the part that closes the mounting hole of the blower case is formed of a closing member made of a resin material. By using the air conditioner, less vibration is transmitted to both, thereby suppressing noise compared to the conventional method and improving the air conditioning feeling.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a blower according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the same blower, and FIG. 3 is a graph showing an example of the noise level when the blower motor is driven alone. 4 is a graph showing an example of the noise level when a blower motor is attached to a blower case and driven, and FIG. 5 is an exploded perspective view of a blower according to a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Blower, 2...Blower case, 3...Blower fan, 4...Blower motor, 15...Mounting stay 16...Buffer material, 20...Closing member. Funeral 1 diagram

Claims (1)

[Claims] A mounting hole for inserting a blower motor is provided in a blower case having an inlet and an outlet at a position opposite to the inlet, and mounting stays for attaching the blower motor are arranged radially at a predetermined interval on the outer periphery of the blower motor. A suitable number of closing members protrude from the mounting stay and covering the mounting stay to close the mounting hole. A blower motor mounting structure characterized in that it can be attached to a blower case by arranging.