JP2003049793A - Fan mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan mounting device assembled with good workability and capable of reducing transmission of vibration caused by a fan motor to a fan by means of a simple way in a blower having the fan on a motor shaft. SOLUTION: When the motor shaft 8 having a D-cut shape, a spacer 3 having a D-cut shape type projection 3a on the end face, a first vibration insulating rubber 4 having a fitting hole 4a for a D-cut type cylindrical part 4b, the fan 1 having a fan boss 2 having a D-cut type fitting hole 2a are fitted sequentially, the fan 1 and the shaft 8 of the fan motor 9 can be arranged with no contact. By means of the vibration insulating rubbers 4 and 5 arranged above and below the fan 1, transmission of magnetic vibration caused by the motor 1 to the fan is reduced, and consequently, noise due to resonance is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a fan mounting device for an air conditioner.

[0002]

2. Description of the Related Art In a conventional blower, in order to reduce the vibration between a fan and a motor shaft generated from a fan motor, the fan is sandwiched with anti-vibration rubber from both sides thereof. Torque transmission was performed with the motor shaft and fan in direct contact.

[0003]

In the above-mentioned prior art, since the torque is transmitted to the fan while the fan and the motor shaft are in direct contact with each other, the vibration generated by the fan motor is directly propagated to the fan to cause resonance. Was a source of noise.

It is an object of the present invention to provide a fan mounting device that suppresses the propagation of vibrations generated by a fan motor to a fan, has a good assembling property, and can reduce the propagation of vibrations by a simple method. .

[0005]

In order to achieve the above object, the present invention provides a D-cut end of a motor shaft,
Spacer, first spacer provided on the end surface of the spacer on the shaft end side
Vibration isolating rubber, a fan provided on the shaft end side of the first vibration isolating rubber, a second vibration isolating rubber provided on the shaft end side of the fan, and a shaft end of the second vibration isolating rubber Side metal washers are sequentially fitted, and a nut is fastened to the tip of the motor shaft to press the metal washer toward the spacer side and fix the fan to the motor shaft in a non-contact state. In the fan mounting device configured as described above, a D-cut hole or a D-cut provided by aligning each of the spacer fitting hole, the spacer end surface protrusion, the vibration isolating rubber fitting hole, and the fan boss fitting hole. Composed of protrusions,
A fan is fixed to the motor shaft in a non-contact state.

Further, the outer shape of the metal washer is polygonal, and the nut can be fastened while pressing the outer shape of the washer when fastening the nut.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Hereinafter, the first embodiment of the present invention will be described. 1 is a sectional view showing a first embodiment of a fan mounting device of the present invention, and FIG. 2 is a sectional view taken along the line AA. As shown in the figure, 1
Is a fan, 2 is a fan boss provided on the fan 1, and is in a non-contact state with a motor shaft 8 and a spacer 3 described later,
The first anti-vibration rubber 4 is provided on the shaft end side and has a D-cut burring hole 2a. Reference numeral 3 is a spacer, and a D-cut projection 3a and a D-cut hole 3b are provided on the end face on the shaft end side. Reference numeral 4 is a first anti-vibration rubber having a D-cut hole 4a provided in alignment with the end face of the spacer 3 on the shaft end side,
The D-cut hole 4a has a D-cut cylindrical portion 4b corresponding to the D-cut protrusion 3a of the spacer 3. Here, the spacer 3, the anti-vibration rubber 4, and the fan boss 2 are the D-cut protrusion 3a or the D-cut cylindrical portion 4b and the D-cut hole 2, respectively.
Fit with a and 4a. Reference numeral 5 denotes a ring-shaped second vibration-proof rubber provided on the shaft end side of the fan 1, and is installed around the burring hole 2a of the fan boss 2. 6 is a metal washer provided on the shaft end side of the second anti-vibration rubber 5, 7 is a male screw 8a provided on the tip of the motor shaft 8, and
A nut for pressing the metal washer 6 toward the spacer 3 side, 9
Is a fan motor.

In the fan mounting device having the above-mentioned structure, the magnetic vibration generated mainly by the operation of the fan motor 9 at a frequency which is a multiple of the power supply frequency causes the fan 1 to have the first and second anti-vibration rubbers 4 on both sides. 5 and the spacer 3 and the metal washer 6 to fix the fan 1 in a non-contact state with the motor shaft 8 and the spacer 3, the propagation vibration is damped, and the fan 1 resonates with the vibration generated by the fan motor 9. It is possible to reduce the occurrence of noise that occurs.

Further, in FIG. 2, the first anti-vibration rubber 4 is
The spacer 3 is positioned and inserted by the D-cut projection 3a provided on the spacer 3. The fan boss 2 is also positioned and inserted by having the D-cut burring hole 2a. The above three parts are D-cut projections or D
The provision of the cut fitting hole facilitates positioning and insertion, and improves assembly workability.

Further, by making the burring hole 2a of the fan boss 2 into a D-cut shape, the cylindrical portion 4b of the first anti-vibration rubber 4 and the surface of the burring hole 2a of the fan boss 2 come into surface contact with each other. It is possible to prevent damage such as generation of cracks in the antivibration rubber 4 caused by the contact due to the operation. Further, by bringing the surface of the burring hole 2a of the fan boss 2 into contact with the surface of the cylindrical portion 4b of the first anti-vibration rubber 4, the anti-vibration effect against the vertical vibration generated in the motor shaft 8 becomes greater. .

In FIG. 2, the ring-shaped second anti-vibration rubber 5 is
By installing the fan boss 2 outside the burring hole 2a, its diameter can be increased and the fan 1 can be stably supported. Further, by making the ring shape, the surface area can be reduced while keeping the outer diameter large, and the natural frequency of the vibration-proof rubber itself can be set lower than the frequency of the magnetic vibration generated in the motor shaft 8. it can. As described above, according to the configuration of the first embodiment, the torque of the fan motor 9 is controlled by the motor shaft 8 having the D-cut shape, the D-cut hole 3b of the spacer 3, the D-cut projection 3a provided on the spacer end surface, and the protection. Although it is connected by the fitting hole 4a of the D-cut cylindrical portion 4b of the vibration rubber 4 and the burring hole 2a of the fan boss 2 and transmitted to the fan 1,
The fan 1 and the motor shaft 8 can be fixed in a non-contact state by the vibration-proof rubbers 4 and 5 installed on both sides of the fan 1, and the propagation of the magnetic vibration generated by the fan motor 9 to the fan 1 is reduced. Noise due to resonance can be reduced.

Embodiment 2. 4 shows Embodiment 2 of the present invention, in which the metal washer 6 shown in Embodiment 1 has a polygonal outer shape.

As shown in the second embodiment, by making the outer shape of the metal washer 6 polygonal, when the nut 7 is fastened, the nut 7 is fastened while pressing the metal washer 6b with a jig or the like. Therefore, the nut 7 can be fastened without applying an unreasonable force to the fan boss 2, the first anti-vibration rubber 4, and the second anti-vibration rubber 5.

[0014]

As described above, according to the present invention, the spacer is provided at the end of the D-cut motor shaft, the first anti-vibration rubber is provided on the end face of the spacer on the shaft end side, and the first anti-vibration rubber is provided. A fan provided on the shaft end side of the vibrating rubber, a second anti-vibration rubber provided on the shaft end side of the fan, and a metal washer provided on the shaft end side of the second anti-vibration rubber, respectively. In the fan mounting device, which is fitted to the motor shaft, the nut is fastened to the tip of the motor shaft to press the metallic washer toward the spacer to fix the fan to the motor shaft in a non-contact state. A D-cut hole or D-cut projection provided by aligning each of the fitting hole, the spacer end surface projection, the vibration-proof rubber fitting hole, and the fan boss fitting hole, and the fan is attached to the motor shaft. Solid in non-contact state Since the can be easily installed fan and fan motor shaft in a non-contact. The vibration damping rubbers provided above and below the fan can reduce the propagation of magnetic vibrations generated by the fantor to the fan and the noise due to resonance.

Further, since the outer shape of the metal washer is polygonal and the nut can be tightened while pressing the outer shape of the washer when tightening the nut, the fan boss, the first anti-vibration rubber, and the The nut can be fastened without applying an excessive force to the vibration damping rubber of 2.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a fan mounting device showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of a metal washer showing a second embodiment of the present invention.

[Explanation of symbols]

1 fan, 2 fan boss, 2a burring hole, 3
Spacer, 3a protrusion, 3b D cut hole, 4 1st
Anti-vibration rubber, 4a D cut hole, 4b cylindrical part, 5 second anti-vibration rubber, 6 metal washer, 7 nut, 8
Motor shaft, 8a male screw, 9 fan motor.

Continued front page    (72) Inventor Tsuyoshi Yoshida             2-6-2 Otemachi 2-chome, Chiyoda-ku, Tokyo             Ryoden Engineering Co., Ltd. F-term (reference) 3H033 AA02 AA18 BB02 BB08 CC01                       CC05 DD17 DD26 DD30 EE05                       EE06                 3H035 CC00                 5H607 AA04 BB01 BB26 CC05 CC09                       DD03 DD19 FF04 JJ08

Claims (2)

[Claims] 1. A spacer at a D-cut end of a motor shaft, a first anti-vibration rubber provided on an end surface of the spacer on a shaft end side, and a first anti-vibration rubber provided on a shaft end side of the first anti-vibration rubber. Fan, the second provided on the axial end side of the fan
The vibration-proof rubber and the metal washer provided on the shaft end side of the second vibration-proof rubber are sequentially fitted to each other, and the nut is fastened to the end of the motor shaft, whereby the metal washer is moved to the spacer side. In a fan mounting device that presses and fixes the fan to the motor shaft in a non-contact state, in the fitting hole of the spacer, the projection of the spacer end surface, the fitting hole of the anti-vibration rubber, the fitting hole of the fan boss A fan mounting device comprising a D-cut hole or a D-cut projection provided so as to be aligned with each other, and a fan is fixed to the motor shaft in a non-contact state. 2. The fan mounting device according to claim 1, wherein the metal washer has a polygonal outer shape, and when the nut is fastened, the nut can be fastened while pushing the outer shape of the washer. .