JPH04271246A - Motor - Google Patents

Abstract

PURPOSE:To get a motor which prevents the abnormal sound arising from the resonance when the magnetic oscillation frequency occurring from a motor and the peculiar frequency of the equipment incorporated in the motor equals to each other. CONSTITUTION:A bearing 9 and a pressure spring 10 are housed in one of the housing 1 provided at the frame 2 of a motor 18. In the other housing 1, a ring-shaped vibration-proof washer 20 made of rubber is put between the frame 2 and the bearing 9.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor provided with a vibration-proof washer on a bearing portion.

0002

[Prior Art] Conventionally, this type of electric motor is shown in Fig. 14.
As shown in the figure, in an electric motor 7, a stator 4 and a rotor 6 attached to a rotating shaft 5 are installed inside an outer casing 3 consisting of a frame 2 with hangings 1 provided at both ends. 8, a pressure spring 10 is provided on one side of the bearing 9 to apply extra pressure to the bearing 9, and nothing is inserted into the other bearing 9 (
For example, see Utility Model Application Publication No. 1-180159).

0003

[Problems to be Solved by the Invention] In the conventional electric motor as described above, magnetic vibrations having various frequencies generated from the electric motor 7 are transmitted to the rotor 6, the rotating shaft 5, the bearing 9, and the rotating shaft 5 of the electric motor 7. There was a problem in that vibrations were amplified due to resonance with the natural frequency of the mechanical system constituted by the attached blade load (not shown), and abnormal noise was generated.

[0004] This invention was made to solve the problem, and by lowering the natural frequency of the mechanical system consisting of the rotor, bearings, and blade loads of the electric motor,
The purpose of this invention is to eliminate resonance with magnetic vibrations having various frequencies generated by the electric motor, and to obtain an electric motor that does not generate abnormal noise.

[0005]

[Means for Solving the Problems] An electric motor according to the present invention includes a frame forming an outer casing of the electric motor, a housing provided on inner walls at both ends of the frame, and a housing attached to the housing that rotates a rotation shaft of the electric motor. A vibration-proof ring made of rubber is provided between the bearing and the frame on the other side of the housing. It is made up of multiple washers.

[0006] Furthermore, a ring made of a hard member and having a plurality of uneven portions on its surface is provided, and this ring is placed between the bearing and the frame on the other side of the housing so as to overlap with a vibration isolating washer.

[0007] Furthermore, a plurality of uneven portions are provided on the surface of the vibration isolating washer.

[0008] Furthermore, the vibration isolating washer is formed of a spring member made of metal.

Furthermore, a plurality of protrusions are provided on the inner wall of the housing.

0010

[Operation] The present invention includes a frame forming the outer casing of the electric motor, a housing provided on the inner walls at both ends of the frame, and a bearing attached to the housing and rotatably supporting the rotating shaft of the electric motor. One of the housings is provided with a pressing spring provided between the bearing and the frame, and the other side of the housing is provided with a plurality of ring-shaped rubber anti-vibration washers between the bearing and the frame. As a result, the spring constant of the bearing portion becomes smaller.

[0011] Furthermore, by providing a ring made of a hard member and having a plurality of uneven portions on its surface, and placing this ring on the other side of the housing between the bearing and the frame so as to overlap with the vibration washer, the hard member The spring constant of the bearing portion becomes smaller due to the uneven shape.

Furthermore, by providing a plurality of concave and convex portions on the surface of the vibration isolating washer, the spring constant of the bearing portion is changed by the concavities and convexities.

Furthermore, since the vibration isolating washer is formed of a spring member made of metal, the spring constant of the bearing portion can be changed by the spring member.

Furthermore, since the plurality of convex portions are provided on the inner wall of the housing, the outer periphery of the bearing comes into partial contact with the inner wall of the housing.

[0015]

[Example] Example 1. 1 to 4 are diagrams showing one embodiment of the present invention, and 1 to 6 and 8 to 10 indicate the same or equivalent parts as in the conventional example. In the figure, 12 is a ventilation fan, which includes a main body 13, a blower part 14 housed in the main body,
It consists of a grill 15 and a duct connection port 16. 17 is a blade casing constituting the blower section; 18 and 19 are electric motors and impellers housed in the casing; 20 is a vibration-proof washer made of rubber; As shown in b, it is formed into a ring shape with a rectangular or circular cross section.

In the electric motor constructed as described above, two anti-vibration washers 20 are stacked between the bearing 9 and the frame 2 on the side of the housing 1 where the pressing spring 10 is not provided, as shown in FIG. . Next, this electric motor 18 is assembled into the blower section 14, and this blower section 14 is further assembled into the main body. Then, the ventilation fan 12 is operated at a mounting location not shown. In this case, by providing a plurality of anti-vibration washers 20 in the housing 1, the spring constant of the bearing portion is reduced, and the mechanical system consisting of the rotor 6, rotating shaft 5, bearing 9, and impeller 19 of the electric motor 18 The natural frequency of the electric motor 18 is lowered, and various magnetic vibration frequencies generated by the electric motor 18 are removed, suppressing abnormal noise and reducing noise.

Example 2. In the above embodiment, the anti-vibration washer 2
However, as shown in FIG. 5, by providing a ring 22 made of a hard member made of plastic or metal and having a plurality of uneven portions 21 on its surface, and laminating it with the vibration isolating washer 20, as shown in FIG. Compared to the above embodiment, the spring constant of the bearing portion is further reduced, and abnormal noise from the electric motor 18 can be further suppressed.

Example 3. In addition, as shown in FIGS. 6 to 9, vibration isolating washers B are provided with uneven portions 21 on one or both sides.
20a may be provided between the bearing 9 and the frame 2, which can suppress the generation of abnormal noise and reduce noise, and may also be combined with a metal flat washer 23.

Example 4. Further, as shown in FIGS. 10 to 12, the vibration isolating washer 20 may be replaced with a wave washer 2, for example.
4. By forming the coil spring 25 and the cut-and-raised spring 27, the same effect as the vibration-proof washer 20 made of rubber can be obtained, and furthermore, since it is made of metal, a long life and high reliability can be obtained.

Example 5. Further, as shown in FIG. 13, a plurality of convex portions 29 are provided on the bearing housing 28 on the inner wall of the housing 1, and the bearing outer periphery 30 of the bearing 9 partially contacts the ball bearing 8, so that the fit between the ball bearing 8 and the housing 1 is loose. The rotor 6 of the electric motor 18, the rotating shaft 5,
The natural frequency of the mechanical system constituted by the bearing 9 and the impeller 19 changes, and resonance with the various magnetic vibration frequencies generated by the electric motor 18 is removed, making it possible to prevent abnormal noise from occurring.

[0021]

[Effects of the Invention] Since the present invention is constructed as described above, it produces the following effects.

The electric motor according to claim 1 includes a frame forming an outer casing of the electric motor, a housing provided on the inner wall at both ends of the frame, and a housing attached to the housing to rotatably support the rotating shaft of the electric motor. A bearing, a pressing spring provided between the bearing and the frame on one side of the housing, and a plurality of ring-shaped rubber anti-vibration washers between the bearing and the frame on the other side of the housing. This arrangement prevents the resonance phenomenon in which the various magnetic vibrations generated by the motor resonate with the natural frequency of the mechanical system consisting of the motor's rotor, rotating shaft, bearings, and impeller, resulting in low vibration and low noise. can be achieved.

[0023] In the electric motor of the second aspect, a ring made of a hard member and having a plurality of uneven portions on the surface is provided, and this ring is disposed on the other side of the housing so as to overlap with a vibration isolating washer between the bearing and the frame. This prevents the resonance phenomenon in which the various magnetic vibrations generated by the motor resonate with the natural frequency of the mechanical system consisting of the motor's rotor, rotating shaft, bearings, and impeller, resulting in low vibration and low noise. .

[0024] In the electric motor according to claim 3, since the plurality of uneven portions are provided on the surface of the vibration isolating washer, various magnetic vibrations generated by the electric motor are transmitted through the rotor, rotating shaft, bearing, and impeller of the electric motor. This prevents the resonance phenomenon that resonates with the natural frequency of the mechanical system, resulting in low vibration and low noise.

In the electric motor of claim 4, since the vibration isolating washer is formed of a spring member made of metal, various magnetic vibrations generated by the electric motor are transmitted through the rotor, rotating shaft, bearing, and impeller of the electric motor. This prevents the resonance phenomenon that resonates with the natural frequency of the mechanical system, resulting in low vibration and low noise, resulting in a long life and high reliability of the vibration isolating washer.

[0026] In the electric motor of the fifth aspect, since the inner wall of the housing is provided with a plurality of convex portions, the ball bearing and the housing fit loosely, and the rotor, rotating shaft, bearing, and impeller of the electric motor are The natural frequency of the mechanical system is changed, and the resonance with the various magnetic vibration frequencies generated by the electric motor is removed, thereby preventing the generation of abnormal noise.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of a ventilation fan showing a first embodiment of the present invention.

FIG. 2 shows Example 1 of the present invention, in which a is a sectional view and a plan view of a vibration isolating washer, and b is an assembled sectional view.

FIG. 3 shows Example 1 of the present invention, in which a is a sectional view and a plan view of a vibration isolating washer, and b is an assembled sectional view.

FIG. 4 is an assembled sectional view of a vibration isolating washer showing Embodiment 1 of the present invention.

FIG. 5 shows a second embodiment of the present invention, in which a is a sectional view and a plan view of a vibration isolating washer, and b is an assembled sectional view.

FIG. 6 shows a third embodiment of the present invention, in which a is a cross-sectional view and a plan view of a vibration isolating washer, and b is a cross-sectional view of the vibration isolating washer.

FIG. 7 shows a third embodiment of the present invention, in which a is a sectional view and a plan view of a vibration isolating washer, and b is an assembled sectional view.

FIG. 8 shows a third embodiment of the present invention, in which a is a sectional view and a plan view of a vibration isolating washer, and b is an assembled sectional view.

FIG. 9 shows a third embodiment of the present invention, in which a is a sectional view and a plan view of a vibration isolating washer, and b is an assembled sectional view.

FIG. 10 is an assembled sectional view of a wave washer showing a fourth embodiment of the present invention.

FIG. 11 is an assembled sectional view of a coil spring showing a fourth embodiment of the present invention.

FIG. 12 shows a fourth embodiment of the present invention, in which a is a plan view of a cut-and-raise spring, and b is a cross-sectional view of the assembled spring.

FIG. 13 shows a fifth embodiment of the present invention, in which a is a partial plan view of the housing and b is a sectional view.

FIG. 14 is a sectional view showing a conventional electric motor.

[Explanation of symbols]

1 Housing 2 Frame 5 Rotation axis 9 Bearing 10 Pressure spring 18 Electric motor 20 Anti-vibration washer 20a Anti-vibration washer B 21 Uneven part 22 ring 27 Spring member 29 Convex part

Claims (5)

[Claims] [Claim 1] A frame forming an outer casing of an electric motor;
A housing provided on the inner wall at both ends of the frame, a bearing attached to the housing and rotatably supporting the rotating shaft of the electric motor, and a pressing spring provided between the bearing and the frame on one side of the housing. An electric motor comprising: a plurality of ring-shaped rubber anti-vibration washers arranged between the bearing and the frame on the other side of the housing. [Claim 2] A ring made of a hard member and having a plurality of uneven portions on the surface is provided, and this ring is disposed between the bearing and the frame on the other side of the housing so as to overlap with a vibration isolating washer. An electric motor according to claim 1. 3. The electric motor according to claim 2, wherein a plurality of uneven portions are provided on the surface of the vibration isolating washer. 4. The electric motor according to claim 1, wherein the vibration isolating washer is formed of a spring member made of metal. 5. The electric motor according to claim 1, wherein a plurality of convex portions are provided on the inner wall of the housing.