JPH01139097A - Motor attachment apparatus in washer - Google Patents

Abstract

PURPOSE: To quiet a washing machine and to smooth a driving device operation by attaching the spring body of a specified intrinsic vibration number to the bottom part lower surface of a water receiving tank and directly suspending an electric motor by the spring body. CONSTITUTION: The electric motor 5 is suspended from the bottom part lower surface of the water receiving tank 1 by the spring body 10. For the spring body 10, a band plate provided with elasticity is bent in an equal leg trapezoidal shape and both end parts of a part equivalent to the long bottom surface of the trapezoidal body are made to face each other with an interval. Also, the acute angle of a trapezoid is made smaller than 45 deg.. Also, notches 11 for bolts are formed on one side as an attaching part to the water receiving tank 1 at both side parts of the long bottom surface of the spring body 10 and a bolt hole 12 is pierced at the center as the attaching part to the electric motor 5 on a short bottom surface. In the spring body 10, the natural frequency of a vibration system with the electric motor 5 is set so as to be smaller than 1/2<1/2> of the generated frequency of the electric motor 5.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a mounting device for a motor of a fully automatic washing machine.

[Conventional technology]

As shown in Fig. 3, a fully automatic washing machine has a water tank (1) inside an outer box (8), a washing/drying tank (2) rotatably installed inside this water tank (1), and A rotary blade (3) such as a pulsator, an agitator (an agitator in the illustrated example), etc. is provided in the washing/dehydrating tank (2). (4) in the figure shows the washing/dehydrating tank (2) and the rotary blade. (3) shows a drive device that rotates.

The drive shaft of the dehydration tank (2) and the drive shaft of the rotor (3) enter this drive device (4) as multiple shafts, and the drive device (4) further connects the dehydration tank (2) and the rotor (3). It has a spring clutch mechanism (4a), a brake mechanism (4b), etc. that switches between rotating both of the rotor blades (3) in one direction at the same time and rotating only the rotor blade (3) in forward and reverse directions via a reduction gear.

The drive device (4) is attached to the outer lower surface of the bottom of the water tank (1), and the electric motor (5) is also fixed to the lower surface of the bottom of the water tank (1) via a flat rib (7). (5
) and a pulley mounted below the drive shaft of the drive device (4),
They are connected via a belt (6).

When washing, the rotation of the electric motor (5) is caused by the rotation of the belt (6).
is transmitted to the drive device (4) via the drive device (4), which rotates the rotating shaft of the rotor blade (3), causing the rotor blade (3) to swing. Further, during dewatering, the rotary blade (3) and the washing/dehydrating tank (2) are rotated together at high speed in one direction by the drive device (4).

By the way, the water tank (1) is suspended and supported from the upper part of the outer box (8) by a suspension rod (9) with a spring (9a) interposed therebetween. The reason why the water receiving tank (1) is provided with a vibration-proof hanging support via the spring (9a) is that if uneven distribution of laundry occurs during dewatering in the washing/spin-driving tank (3), ) as well as the water tank (1), the vibrations are suppressed.

[Problem that the invention seeks to solve]

Even if there is a vibration isolation mechanism using such a hanging rod (9), if the electric motor (5) is fixed to the rib (7) installed under the bottom of the water tank (1) as described above, the electric motor (5)
There is a problem in that the vibrations are directly transmitted to the water tank (1) via the ribs (7), which aggravates the vibrations of the water tank (1) and increases noise.

In addition, regarding transmitting the rotational force of the electric motor (5) to the drive device (4) via the belt (6), the water receiving tank (1)
The weight of the electric motor (5) attached to the rib (7) on the lower surface of the bottom of the water tank (1) may cause deformation of the bottom of the water tank (1), or the bottom of the water tank (1) may not expand or contract due to temperature changes. Due to the firmness, it becomes difficult to maintain the tension of the belt (6) applied at the time of manufacture, resulting in loosening and insufficient transmission.

By the way, in order to prevent the vibration of the electric motor (5) from being transmitted to the water tank (1), the electric motor (5) must be placed in the outer box (1), although not shown in the drawing.
), but in this case, the drive device (4) and electric motor (5) can be installed horizontally in parallel and installed at the bottom of the water tank (
It cannot be stored compactly under the outer box (1).
) becomes large.

The purpose of the present invention is to eliminate the disadvantages of the conventional example, to make the washing machine quieter by preventing the vibrations of the motor from being directly transmitted to the water tank even when the motor is installed under the water tank, and to make the washing machine quieter. To provide a washing machine motor mounting device capable of appropriately maintaining the tension of a belt interlocking the device.

[Means for solving problems]

In order to achieve the above object, the present invention rotatably provides a washing and dehydrating tank inside a water receiving tank provided in an outer box, a rotating blade is provided in the washing and dehydrating tank, and an electric motor is installed outside the bottom of the water receiving tank. In a fully automatic washing machine in which a driving device for rotating the rotary blade and a washing and dewatering tank is installed, and the electric motor and the driving device are connected by a belt, the natural frequency is 1 of the natural frequency of the electric motor on the lower surface of the bottom of the water receiving tank. The gist of the present invention is to attach a spring body whose diameter is smaller than /r2, and to directly suspend the electric motor by the spring body.

[Effect]

According to the present invention, the transmissibility of the vibration of the electric motor is less than 1, and the vibration of the electric motor is prevented from increasing the vibration of the water tank. In addition, the elasticity of the spring body stably maintains the appropriate belt tension of the belt that controls the interlocking of the electric motor and the drive device.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a longitudinal sectional side view of a washing machine equipped with a motor mounting device of the present invention, in which the same components as in FIG. 3 showing the conventional example are given the same reference numerals.

The overall structure of the fully automatic washing machine is the same as the conventional one, and a detailed explanation will be omitted, but a water receiving tank (1) is provided inside the outer box (8), and a washing/drying tank (2) can be rotated inside. established in
A rotary blade (3) is provided in the washing and dehydrating tank (2). Then, an electric motor (5), the rotary blade (3), and a rotation drive device (4) for the washing and dewatering tank (2) are attached to the outside of the bottom of the water receiving tank (1).

Further, the electric motor (5) and the drive device (4) connect their respective pulleys with a belt (6).

In the figure, (9) is a hanging rod that suspends and supports the water tank (1) within the outer box (8) with a spring (9a) interposed at the tip.

In the present invention, the electric motor (5) is suspended from the lower surface of the bottom of the water receiving tank (1) by a spring body (10).

Fig. 2 shows an example of this spring body (10), in which an elastic strip is bent into an isosceles trapezoidal shape, and there is no gap between the ends of the part corresponding to the long base of the trapezoidal body. and make them face each other. Note that the acute angle of the trapezoid is smaller than 45°.

In addition, both sides of the long bottom surface of the spring body (10) are connected to the water tank (1).
) has a notch (11) for a bolt on one side as a mounting part for the
, (11), and a bolt hole (12) was drilled in the center of the short bottom as a mounting part for the electric motor (-5).

The natural frequency of the spring body (10) is set to be smaller than the natural frequency t4''E of the electric motor (5).The natural frequency of the spring body (10) is set as follows. It will be determined by the material and shape.

The notches (11), (11) on the long bottom surfaces of the two spring bodies (10) formed as described above are placed on the lower surface of the bottom of the water receiving tank (1), taking into consideration the position and size of the electric motor (5). Then fit two of the four protruding bolt bodies into appropriate positions and tighten them using nuts. Then, align the bolt holes (12) on the short bottom surface of the spring body (10) with the bolt holes on the reinstallation ears of the electric motor (5), and then tighten the nuts to fix and suspend the electric motor (5). .

Next, the operation will be explained. The rotational force generated from the electric motor (5) is transmitted to the drive device (4) by the belt (6), and is output as rotation of the rotary blade (3) and the washing/drying tub (2). At this time, the electric motor (5) vibrates due to its rotational force, magnetic vibration, and the like.

Generally, the vibration transmissibility α can be expressed by the following formula.
--・--1～-・-(1) W... Frequency of vibration on the applying side Wn... Natural frequency of the spring c/Cc... Frequency damping rate In the present invention, the spring body (10 ) is set to be smaller than 1/j of the natural frequency W of the motor (5) (W in the above equation (1)), and α in the above equation (1), that is, the vibration transmission speed is becomes smaller than 1, and the amplitude decreases.

If we set w/w yl = k, then α=1<
(1- to 2) 2・-・-(2) From f< k, Wn
Kl/1! The value TW can be derived.

In addition, the elasticity of the spring body (10) causes the spring 'h (10) to flex itself in response to changes in the tension of the belt (6) that interlocks the electric motor (5) and the drive device (4). , the tension of the belt (6) is always stable and an appropriate tension is maintained.

In this embodiment, a trapezoidal spring body was used as the spring body (10), but as mentioned earlier, it has appropriate elasticity and the stiffness of the electric motor is less than the frequency of 1. As long as it has a small natural frequency and can be fitted with an electric motor, its material and shape are not critical.

〔Effect of the invention〕

As described above, the washing machine electric motor mounting device of the present invention has the following features:
A washing and dehydrating tank is rotatably provided inside a water receiving tank provided in an outer box, a rotary blade is provided in the washing and dehydrating tank, and an electric motor is installed outside the bottom of the water receiving tank to rotate the rotary blade and the washing and dehydrating tank. In fully automatic washing machines where a drive device is installed and the motor and drive device are connected by a belt, the spring body that directly suspends the motor effectively absorbs the vibration of the motor and alleviates the vibration of the water tank. , which can make washing machines quieter.

Further, the elasticity of the spring body stably maintains the optimal belt tension of the belt that governs the interlocking of the electric motor and the drive device, so that the drive device can operate smoothly.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view of a washing machine equipped with a motor mounting device of the present invention, FIG. 2 is a perspective view of a spring body, and FIG. 3 is a longitudinal sectional side view of a washing machine showing a conventional example. (1)...Water tank (2)...Washing/dehydration tank (3)...Rotary blade (4)...Drive device (4
a) Spring clutch mechanism (4b) Brake mechanism (5) Electric motor (6) Belt (7)
... Rib (8) ... Outer box (9) ... Hanging rod (9a) ... Spring (10) ... Spring body (11) ... Notch (12) ... Bolt hole

Claims (1)

[Claims] A washing and dehydrating tank is rotatably provided inside a water receiving tank provided in an outer box, a rotary blade is provided in the washing and dehydrating tank, and an electric motor is installed outside the bottom of the water receiving tank to rotate the rotary blade and the washing and dehydrating tank. In a fully automatic washing machine in which a drive device is installed and the motor and drive device are connected by a belt, a spring body whose natural frequency is smaller than 1/√2 of the natural frequency of the electric motor is installed on the lower surface of the bottom of the water tank. A washing machine motor mounting device characterized in that the motor is directly suspended by the spring body.