JPH0615503Y2 - Resonance prevention structure for fan motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a structure for reducing noise in an electronic device or the like using a cooling fan motor, and more particularly to a structure for preventing resonance noise of a fan motor.

[Prior Art] With the recent progress in large-capacity and miniaturization of electronic devices, the need for internal cooling of the electronic device casing has naturally increased, and a cooling fan motor attached to the casing has naturally increased. The problem of noise due to resonance remains.

FIG. 4 is an exploded perspective view showing one mounting example of a conventional cooling fan motor, in which a fan motor 2 is attached to a mounting plate 1 (only a main part is shown) of an electronic device casing such as a rubber cushion (not shown). The structure is such that the flanges 3 and 4 are attached by screws 5 at the corners 3a, 3a and 4a, 4a of the flanges 3 and 4, respectively. Here, 1a, 3b, 4b
Are through holes provided in the mounting plate 1, the flange 3 and the flange 4, respectively, and the screws 5 are through holes 1a, 3b,
Penetrate 4b. Further, 3c is a support leg that is integral with the flange 3 and integrally supports the bearing portion 3d. 6 is a bearing portion 3d
It is a fan bearing a lower part and connected to a rotatable motor.

[Problems to be Solved by the Invention] However, if the fan motor 2 having the above-described configuration is screwed to the mounting plate 1 of the electronic device casing with the screw 5 via the cushioning member, the vibration noise generated from the fan motor 2 is generated. There is a problem in that the mounting plate 1 resonates to increase noise.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is to elastically support the fan motor by levers provided on both outer sides of the fan motor frame and mount the housing. An object of the present invention is to provide a resonance noise prevention structure for a fan motor by preventing an increase in noise when the fan motor is attached to the plate.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a resonance noise preventing structure for a fan motor according to the present invention has both corners formed on opposite outer peripheries of a cylindrical frame that houses the fan motor. From the above, a vibration transmission preventing lever that extends in parallel to the direction of contacting the outer circumference and that tilts to reach the bottom of the bottom of the frame body is provided, and the cylindrical frame body is fixed to the mounting plate by the tip mounting body,
This is a structure for preventing resonance noise of a fan motor in which a fan motor is carried on an electronic device casing.

The vibration transmission preventing lever may be made of a separate elastic member and fixed to the frame body, but it is preferably formed integrally with the frame body.

[Operation] According to the present invention, since the resonance noise preventing structure of the fan motor as described above is provided, the fan motor can be formed only by the attachment body of the tip end portions of the two vibration transmission preventing levers provided on the frame body. Since the vibration is transmitted from the fan motor to the lever because it is carried by the electronic device casing, the function of preventing resonance noise is exerted. Therefore, the problem can be eliminated.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a partially exploded perspective view showing an embodiment of the present invention, and FIG. 2 is a side sectional view thereof. 1 and 2 in FIG.
Reference numeral 12 is a mounting plate of an electronic device housing to which the fan motor is mounted, and 12 is a plastic-molded cylindrical frame body that houses the fan motor, and has upper and lower angular flanges 12a and 12b
There is. Reference numeral 13 denotes a bearing portion which is suspended by radial support legs 14 and which is integrally formed with the flange 12a. The upper end of the motor shaft is supported inside the bearing portion. Although not shown, a fan motor body is provided, and the lower end is pivotally supported by the bearing portion of the lower flange 12b. Reference numeral 16 is a vibration transmission preventing lever made of, for example, an elastic member such as a spring, and as shown in FIG. The upper part is fixed to one corner 112a of the flange 12a by a screw 17. Reference numeral 16 'denotes a vibration transmission preventing lever which has the same structure as the lever 16 and is provided on the opposite side of the frame body 12 and is inclined parallel to and opposite to the lever 16 (see FIG. 2). 16a and 16a 'are levers 16,
An attachment body provided at the tip of 16 'and parallel to the flanges 12a and 12b is attached to the attachment plate 11 of the electronic equipment casing with a screw 18.

With such a configuration, the fan motor is buffered by the levers 16 and 16 'made of elastic members, and only the mounting members 16a and 16a' are carried on the mounting plate 11 which is a flexible body. Therefore, the vibration caused by the attitude of the fan motor is generated by the lever 1 made of the elastic member.
Since the vibrations are not transmitted to the mounting plate 11 because they are buffered by 6, 16 ', resonance is less likely to occur. According to the measurement, the noise of 43 db in the conventional structure is reduced to about 38 db in this embodiment.

FIG. 3 is an external perspective view showing another embodiment of the present invention. In this case, the levers 26, 26 'are integrally formed with the frame body 22, which is different from the embodiment shown in FIG. . That is, in FIG. 3, reference numeral 21 is a mounting plate of an electronic device casing to which a cooling fan motor is attached, 22 is a frame of the fan motor, and corner portions 2 are provided on the outer periphery 22a at opposite portions.
2b and 22c are formed. Further, 23 is a bearing portion, 24 is a support leg that integrally supports the bearing portion 23 on the frame body 22, and the bearing portion 23 and the support leg 24 are integrally formed with the frame body 22. 25 is a fan, 26, 26 '
Is a vibration transmission preventing lever that extends in parallel from the opposite corners 22b and 22c of the frame body 22 in the direction of contacting the outer circumference, and that tilts to reach the bottom of the frame body.
Reference numeral 6a denotes an attachment body integrally formed at its tip portion, and the attachment surface is parallel to the upper and lower surfaces of the frame body 22. According to this embodiment, up to the vibration transmission preventing levers 26 and 26 ', the frame 2 is provided.
2, the fan motor is attached to the mounting body 2
6a and 26a '(not shown) are held on the mounting plate 21 by screws 27 only on two surfaces, so that the assembly is easier and easier than in the previous embodiment (see FIGS. 1 and 2). It has certain characteristics that it is reliable and inexpensive, and this embodiment (Fig. 3)
Is preferred.

[Advantages of the Invention] Since the present invention is configured as described above, it has the following effects.

In the resonance noise preventing structure for a fan motor according to claim (1), since the mounting plate of the electronic device casing carries the fan motor only by the tip mounting bodies of the vibration transmission preventing levers inclined in opposite directions, the fan is mounted. Vibration of the motor itself is attenuated by these two levers, and noise 43d is generated in the conventional structure.
The thing of b is suppressed below 38db.

In the resonance noise preventing structure for a fan motor according to claim (2), an electronic device casing with less noise can be obtained by simply screwing a vibration transmission preventing lever made of an elastic member to a fan motor having a conventional structure.

When the resonance sound preventing structure for a fan motor according to claim (3) is used, the vibration transmission preventing lever is formed integrally with the frame of the fan motor, so that the assembly is easier than that according to claim (2). The cost can be reduced and the noise can be more reliably prevented.

[Brief description of drawings]

1 is an external perspective view showing an embodiment of the present invention, FIG. 2 is a side sectional view thereof, FIG. 3 is an external perspective view showing another embodiment of the present invention, and FIG. 4 is an exploded view of a conventional example. It is a perspective view. 11,21 ... Mounting plate, 12,22 ... Frame body, 13,2
3 ... Bearings, 14, 24 ... Support legs, 15, 25 ...
Fans, 16, 16 ', 26, 26' ... Vibration transmission preventing levers, 16a, 26a ..

Claims (3)

[Scope of utility model registration request] 1. A cylindrical frame body for accommodating a fan motor, extending from both corner portions formed on opposite outer peripheries of the cylindrical frame body in parallel with each other in a direction in contact with the outer peripheries thereof, and being inclined and below the bottom surface of the frame body. Resonance prevention structure for fan motors, which is equipped with a vibration transmission prevention lever that reaches up to this point, fixes the cylindrical frame to the mounting plate with this tip mounting body, and carries the fan motor on the electronic device housing. 2. The resonance noise preventing structure for a fan motor according to claim 1, wherein the vibration transmission preventing lever is made of an elastic member and is connected to both corners of the upper flange of the cylindrical frame. 3. The resonance sound preventing structure according to claim 1, wherein the vibration transmission preventing lever is formed integrally with the cylindrical frame body.