JP2734668B2 - Washing machine motor support device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a motor support device for a washing machine.

2. Description of the Related Art Conventionally, for example, as shown in FIG. 4, in a dehydration washing machine, a washing and dehydration tub 2 provided inside a water tub 1 for storing water for washing has a pulsator 3 for agitating clothes on a central inner bottom portion, and a side wall on a side wall. Has a number of small holes for draining water. Reference numeral 5 denotes a bearing box having a mechanism for transmitting the driving force of a motor 6 so as to rotate only the pulsator 3 during washing and to rotate the washing and dewatering tub 2 during spin-drying. The motor 6 transmits a driving force to the bearing housing 5 by a belt 7 and a pulley 8.

A support plate 4 is provided with a water tank 1, a motor 6, a bearing box 5 and the like, and is suspended from a corner of the outer frame 01 by a rod 9 via a suspension 12 and a spherical seat 13. 11 is a balancer provided above the washing and dewatering tub.

Problems to be Solved by the Invention In the above configuration, since the motor 6 is fixed to the water tank 1 via the support plate 4, vibration of the motor 6
In particular, 2f vibration peculiar to the single-phase induction motor was directly transmitted to the water tub 1 and the washing and dewatering tub 2, and this vibration was enlarged in the water tub 1 and the washing and dewatering tub 2, and generated loud noise. In particular, these days, these noises are becoming a big problem in the market, because the number of washings at night is increasing with the employment of housewives.

In order to solve this problem, the motor 6 and the support plate 4
It has been considered that a cushioning material such as rubber is provided between the motor 6 and the motor 6 elastically supported by the cushioning material when the hanging portion including the motor 6 vibrates due to imbalance of the laundry. There is also a problem that the belt 7 slips.

In addition, the vibration generated by the motor 6 also includes the rotation vibration of the motor shaft other than the motor 6 itself, and this rotation vibration is transmitted to the water tub 1 and the washing / dewatering tub via the belt 7 to generate noise. there were.

The present invention has been made in view of the above problems, and in a washing machine having a structure of a water tub attached to a support plate by attaching a motor, a water tub, a bearing box, and the like, the driving noise is reduced, and the belt slip is performed. The purpose is to prevent.

Means for Solving the Problems In order to achieve the above object, a washing machine according to the present invention comprises a pulsator at an inner bottom portion for vibration-insulating a motor as a vibration source and a water tub and a washing and dewatering tub that magnify it as noise. , A tub containing the washing and dewatering tub, an outer frame for hanging and supporting the tubing via a suspension, a motor for driving the pulsator and the washing and dewatering tub, a water tub, a motor and a bearing In a washing machine provided with a support plate to which a box or the like is mounted, the upper and lower bearings of the motor are sandwiched between a lower mounting plate and an upper mounting plate by an elastic support, and a hollow shaft is provided at a substantially central portion of the lower mounting plate. A fixed pulley is provided rotatably with a pulley provided with a bearing portion on the hollow shaft, and the pulley and the shaft of the motor are connected by an elastic coupling formed of an elastic body.

Operation 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. Further, since the pulley and the motor shaft are connected via the elastic coupling, the rotational vibration of the motor shaft can be insulated. Furthermore, since the pulley is rotatably mounted on the lower mounting plate, the problem that the pitch x between the pulley and the bearing box shrinks and the belt slips can be solved, and the quality is stabilized while reducing noise. The structure can be realized.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG. The same parts as those in the conventional example are denoted by the same reference numerals, and the description is omitted.

In the figure, reference numeral 16 denotes a substantially cylindrical elastic support, whose inner peripheral surface is fitted into and supported by the bearing 6b of the motor 6 and its outer peripheral portion is fitted into the lower mounting plate. An elastic support 16 is similarly fitted into the upper mounting plate 15, and the motor 6 is mounted on the lower mounting plate 14.
And an upper mounting plate 15 with an elastic support 16 interposed therebetween.

Reference numeral 8 denotes a pulley for driving the belt 7, and a bearing 19 is provided on the inner surface thereof. The pulley 8 is rotatably mounted on the outer peripheral surface of the hollow shaft 20 press-fitted and fixed to the lower mounting plate 14.

Reference numeral 18 denotes an elastic coupling, which connects a substantially rotation center of the pulley 8 and the motor shaft 6a to a lower washer 18a or an upper washer 18b formed integrally with the elastic coupling 18.
Are connected via. The lower washer 18a is provided in a concave portion provided below the pulley 8, and the upper washer 18b is provided in the motor shaft 6
a, each of which is fitted, through which torque is transmitted.

The lower mounting plate 14 is screwed together with the upper mounting plate 15 to the support plate 4 with bolts, and the pulley 8, the elastic coupling 1
8. The members of the hollow shaft 20, the elastic support 16, and the motor 6 are disposed substantially coaxially.

The vibration of the main body of the motor 6 is reduced by the lower mounting plate 14 and the upper mounting plate.
In order to prevent the vibration from being transmitted directly to the motor 15, the elastic modulus of the elastic support 16 is determined by calculating the natural frequency in each direction of the motor 6 by the 2f frequency generated from the motor 6. It is set to be less than double. Similarly, the elastic modulus of the elastic coupling is such that the natural rotation frequency of the rotor in the motor 6 is 2f frequency. It is set to be less than double.

The elastic support 16 and the elastic coupling 20 may be either a rubber or a metal coil spring.
Both the motor 6 body and its rotor are What is necessary is that it can be supported at a natural frequency of twice or less.

Further, the bearing 19 is in the form of a sliding bearing, but may be a rolling bearing.

Effect of the Invention As described above, in the present invention, since 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 hardly transmitted, and the motor shaft and the pulley are Since it is connected via the elastic coupling, the rotational vibration of the motor is hardly transmitted to the water tub, the washing tub and the dewatering tub. Therefore, the vibration of the water tank is reduced, and the noise generated thereby is greatly reduced. In addition, since the pulley is rotatably mounted on the hollow shaft fixed to the lower support, the pit x of the pulley and the bearing box shrinks while the belt is rotated while the structure for reducing the vibration transmission of the motor is reduced. Can also be solved.

As described above, according to the present invention, a motor, a water tank, a bearing box and the like are attached to a support plate, and even in a washing machine having a structure of a water tank suspended and supported by an outer frame, the mounting strength of the motor is hardly reduced. This has an extremely large effect that noise can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a motor support device showing a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the hanging portion, FIG. 3 is a bottom view of the hanging portion, and FIG. It is a longitudinal section showing the conventional washing machine. 1 ... water tank, 2 ... washing / dehydration tank, 6 ... motor, 7
... belt, 8 ... pulley, 14 ... lower mounting plate, 15 ...
Upper mounting plate, 16: elastic support, 18: elastic coupling, 19: bearing, 20: hollow shaft.

Claims (1)

(57) [Claims] 1. A washing and dewatering tub having a pulsator at an inner bottom thereof, a water tub containing the washing and dewatering tub, an outer frame for suspending and supporting the water tub via a suspension, and driving the pulsator and the washing and dewatering tub. And a supporting plate on which a water tub, a motor, a bearing box, and the like are mounted, wherein the upper and lower bearings of the motor are sandwiched between a lower mounting plate and an upper mounting plate by an elastic support. A hollow shaft is fixed substantially at the center of the plate, and a pulley provided with a bearing portion is rotatably provided on the hollow shaft, and the pulley and the shaft of the motor are connected by an elastic coupling formed of an elastic body. A motor support device for a washing machine.