JPH0397495A - Motor support device for washing machine - Google Patents

Abstract

PURPOSE:To prevent direct transmission of vibration of a motor to a water drum and a washing and dehydrating drum and to sharply reduce the generation of noise by a method wherein a motor body is nipped between lower and upper mounting plates through a resilient support body. CONSTITUTION:A lower mounting plate 14 is threadedly mounted to a reinforcing plate 4 together with an upper mounting plate 15 by means of a bolt, and members, e.g. a pulley 8, a resilient coupling 18, a hollow shaft 19, a bearing 20, a resilient support body 16, and a motor 6, are disposed approximately on the same axis. In this case, by nipping a motor body through the resilient support body 16 between the upper and lower mounting plates, vibration of the motor body becomes difficult to make. Further, since a motor shaft is coupled to a pulley through a resilient coupling, rotation vibration of the motor is also hardly transmitted to a water drum and a washing and dehydrating drum. This constitution sharply reduces the generation of noise without lowering mounting strength of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a motor support device for a washing machine that supports a motor.

BACKGROUND OF THE INVENTION As shown in Fig. 6, a conventional washing and dehydrating machine has a washing and dehydrating tank 2 inside a water tank 1 that stores water during washing. Pulsator 3,
There are many small holes in the side wall for draining water. Reference numeral 6 denotes a bearing box, which has a mechanism for transmitting the driving force of the motor 6 so as to rotate only the pulsator 3 during washing, and to rotate the washing and dewatering tub 2 during dewatering. 1. Motor 6 is Benoreto 7
The driving force is transmitted to the bearing box 5 by the pulley 8. Reference numeral 4 denotes a reinforcing plate, on which the water tank 1, motor 6, bearing 5, etc. are arranged, and is supported by a support rod 9, hanging from the corner of the outer frame 10 via a sunpension 12 button and a spherical seat 13.

, 11 is a balancer installed above the washing and dehydrating tank.

Problems to be Solved by the Invention In the above configuration, since the motor 6 is fixed to the water tank 1 via the reinforcing plate 4, the vibration of the motor 6, especially the 2f vibration peculiar to a single-phase induction motor, is reduced. The vibrations were directly transmitted to the water tank 1 button and the washing and dehydrating tank 2, and the vibrations were amplified in the water tank 1 and the washing and dehydrating tank 2, producing loud noise. In particular, these noises are becoming a major problem in the market, especially as more and more housewives are doing their laundry at night as they become employed.

1. In order to solve this problem, it has been considered to provide a cushioning material such as rubber between the motor 6 and the reinforcing plate 4, but due to unbalanced laundry etc. The motor 6 is elastically supported by a buffer material when it vibrates.
There was also the issue of the belt shaking and the belt slipping.

Furthermore, the vibrations emitted from the motor 6 are caused not only by the motor 6 itself but also by the rotational vibrations of the motor shaft, and this rotational vibration is transmitted to the water tank 1 and the washing and dewatering tank 2 via the pelt 7, producing noise. There were also challenges.

Therefore, the present invention aims to provide a highly reliable motor support device that prevents motor vibrations, particularly 2F vibrations, from being directly transmitted to the water tank or washing/dehydration tank, significantly reduces noise, and has excellent reliability. The first purpose.

The second purpose is to obtain a low-noise motor support device that is inexpensive and requires fewer assembly steps.

Means for Solving the Problems In order to achieve the above-mentioned first object, the present invention provides vibration isolation between the motor, which is a vibration source, and the water tank and washing/dehydration tank, which amplify the vibration as noise. It is sandwiched between the lower mounting plate and the upper mounting plate via an elastic support,
The pulley is rotatably attached to the lower mounting plate, and the pulley and motor shaft are connected by an elastic coupling.

In order to achieve the second objective, the motor is sandwiched between the lower mounting plate and the reinforcing plate via an elastic support.

Operation According to the above configuration, since the motor body is sandwiched between the lower mounting plate and the upper mounting plate via the elastic support, vibrations of the motor body can be isolated here. Furthermore, since the pulley and the motor shaft are connected via the elastic coupling, rotational vibrations of the motor shaft can also be isolated. Furthermore, since the pulley is rotatably attached to the lower mounting plate via the hollow shaft with a bearing, rotational vibrations of the motor shaft can also be isolated. The problem of the belt slipping due to the narrow pitch I of the pulley and bearing box can be solved, and a structure with stable quality can be realized while reducing noise.

Furthermore, if the reinforcing plate has the function of supporting the motor of the upper mounting plate, it is possible to realize an assembly at low cost and with less man-hours.

EXAMPLE Hereinafter, an example of the present invention will be explained with reference to FIGS. 1, 2, and 3. Note that parts that are the same as those in the conventional example are given the same numbers, and their explanations will be omitted.

In the figure, reference numeral 16 denotes a substantially cylindrical elastic support, the inner peripheral surface of which is connected to the support portion 6b of the motor 6, and the outer peripheral surface of which is connected to the lower mounting plate 1.
4 is inset and supported. Further, an elastic support 18 is similarly fitted into the upper mounting plate 15, and the motor 6 is mounted on the elastic support 18 between the lower mounting plate 14 and the upper mounting plate 16.
It is held in between.

Reference numeral 20 denotes a bearing that is press-fitted and fixed to the substantially central portion of the lower mounting plate 14, and the hollow shaft 19 is press-fitted and fixed to the inner peripheral surface of this bearing. A pulley 8 is fitted into the outer peripheral surface of this hollow llll 19 and fixed thereto by screwing.

Reference numeral 18 denotes an elastic coupling, which connects the approximate center of rotation of the pulley 8 and the motor shaft 6a via a lower washer 18b formed integrally with the elastic coupling 18 or an upper one ear 18b. . The lower washer 18a is fitted into a recess provided at the bottom of the pulley 8, and the upper washer 18b is fitted into the motor shaft 6a.
Rotational force is transmitted through this.

The lower mounting plate 14 is screwed together with the upper mounting plate 16 to the reinforcing plate 4 with bolts, and includes the pulley 8, elastic compression ring 18, hollow shaft 19, bearing 20, and elastic support 16.
, the respective members of the motor e are arranged substantially coaxially.

In order to prevent the main body vibration of the motor 6 from being directly transmitted to the lower mounting plate 14 button and the upper mounting plate 15, an elastic support 16 is provided.
The elastic modulus of is set so that the natural frequency of the motor 6 in each direction is equal to or less than 1/ times the 2f frequency generated from the motor 6. Similarly, the elastic modulus of the elastic compression ring is set so that the rotational natural frequency of the rotor in the motor e is 1/A times the 2f frequency or less.

The elastic support body 16 and the elastic coupling 18 may be either rubber or metal coil springs, and in short, the elastic support body 16 and the elastic coupling 18 may be either rubber or metal coil springs. It would be good if it could be supported by the vibration frequency.

FIG. 4 shows a second embodiment. In this embodiment, the upper mounting plate 15 is removed from the first embodiment.
The motor 6 is sandwiched between the reinforcing plate recess 4a and the lower mounting plate 14 via the elastic support 1e.

Effects of the Invention As described above, in the present invention, the motor is sandwiched between the lower mounting plate and the upper mounting plate via the elastic support.
The vibration of the motor body is difficult to transmit, and since the casing, motor shaft, and pulley are connected via an elastic coupling, almost no rotational vibration of the motor is transmitted to the water tank or washing/drying tank.

Therefore, the vibration of the water tank is small, and the noise generated thereby is greatly reduced. 1.Although this purchase reduces vibration transmission to the motor, since the pulley is attached to the hollow shaft via a bearing press-fitted into the lower support, the pitch I between the pulley and the bearing box is reduced.
It also solves the problem of the belt slipping and twisting due to shrinkage.

In addition, in the present invention, since the reinforcing plate can also serve as the motor supporting function of the upper mounting plate, it can be constructed at low cost and the number of assembly steps can be reduced.

As described above, according to the present invention, it is possible to significantly reduce noise without substantially reducing the mounting strength of the motor, which is an extremely significant effect.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a motor support device showing a first embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the suspension part, FIG. 3 is a bottom view of the suspension part, and The figure is a longitudinal sectional view of a motor support device showing a second embodiment of the present invention, and FIG. 5 is a longitudinal sectional view showing a conventional washing machine. 1...Aquarium, 2...Washing and dehydration tank, 4
...Reinforcement plate, e...Motor, 7...
...Belt, 8...Pulley, 14...
・Lower mounting plate, 15... Upper mounting plate, 16...
...Elastic support, 18...Elastic coupling, 19...Hollow shaft, 20...Bearing.

Claims (2)

[Claims] (1) An elastic support made of an elastic body is sandwiched between the upper and lower parts of the motor and the lower and upper mounting plates of the motor, and a hollow shaft is rotated through a bearing approximately at the center of the lower mounting plate. A motor support device for a washing machine comprising a pulley fixed to the hollow shaft, and the pulley or the hollow shaft and the shaft of the motor connected by an elastic coupling made of an elastic body. (2) An upper elastic support made of an elastic body is sandwiched between a reinforcing plate and an upper part of the motor, and a lower elastic support is sandwiched between a lower part of the motor and a lower mounting plate of the motor,
A hollow shaft is rotatably provided approximately at the center of the lower mounting plate via a bearing, a pulley is fixed to this hollow shaft, and the pulley or the hollow shaft and the motor shaft are connected to an elastic coupling made of an elastic body. A washing machine motor support device that is connected to the motor of a washing machine.