JPH0260697A - Motor fitting device for washing machine - Google Patents

Abstract

PURPOSE:To prevent hanging, with which the oscillation of a motor is transmitted to a water receiving tank as it is, and to suitably maintain the tension of a belt, with which the motor and a driving device are interlocked, by specifying the peculiar oscillating number of an oscillating system to the generating oscillating number of the motor, fitting a spring body, for which an elastic band board is bent in a loop shape so that concentrated reaction can not be generated, to the bottom surface of the water receiving tank and directly hanging the motor with the spring body. CONSTITUTION:A motor 5 is hung from the bottom surface of a water receiving tank 1 by a spring body 10. For the spring body 10, the band board to have elasticity is shaped not to generate the concentrated reaction and bent in a flat loop shape. Then, the both edge parts of a part corresponding to the bottom surface are faced with an interval and on this bottom surface, a volt hole 11 is bored bear the facing part as a fitting part to the water receiving tank 1. For an upper surface, a volt hole 12 is bored as a fitting part to the motor 5. For the spring body 10, the peculiar oscillating number of the oscillating system with the motor 5 is set to be smaller than 2<1/2> of the generating oscillating number to the 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. 6, a fully automatic washing machine has a water tank (1) inside an outer box (8), and a washing/drying tank (2) inside this water tank (1) at one rotation position. 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). In the figure, (4) shows a drive device that rotates the washing and dewatering tank (2) and the rotary blade (3).

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 speed reducer.

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 to be solved by the invention]

However, even with such a vibration isolation mechanism using the hanging rod (9), as mentioned above, the electric motor (5) is not connected to the water tank (1).
When the electric motor (5) is fixed to the rib (7) installed under the bottom of the water tank (1), the vibration of the electric motor (5) is directly transmitted through the rib (7)
), which increases the vibration of the water tank (1) and increases the 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 vibrations of the electric 1ffl (5) from being transmitted to the water tank (1), although not shown, it is possible to install the electric motor (5) at the bottom of the outer box (1). The drive device (4) and the electric motor (5) cannot be housed in a compact manner under the water receiving tank (1) in parallel with each other, resulting in an increase in the size of the outer box (1).

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 and improving durability.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a washing/dehydrating tank rotatably provided inside a water receiving tank provided in an outer box, and a rotary blade installed in the washing/dehydrating tank. In a fully automatic washing machine in which a motor and a drive device for rotating the rotary blade and the washing/dehydration tank are attached to the outside of the bottom of the water receiving tank, and the motor and drive device are connected by a belt, the natural frequency of the vibration system is the same as that of the motor. A spring body is set to be smaller than 1/J″2 of the generated vibration frequency, and the elastic band is bent into a loop shape so as not to generate concentrated stress.A spring body is attached to the bottom surface of the water receiving tank. The gist of this is to directly suspend the electric motor.

[Effect]

According to the present invention, the degree of transmission of the vibration of the electric motor applied to the water tank via the spring body is less than 1, and the vibration of the electric motor is prevented from increasing the vibration of the water tank. In addition, due to the elasticity of the spring body, the appropriate belt tension of the belt that controls the interlocking of the electric motor and drive device is stably maintained, and since the spring body is curved into a loop, there is no concentration of stress and durability is maintained. improves.

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

FIG. 1 is a cross-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. 6 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) in 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 tank (1) by means of a spring body (10).

Figure 2 shows an example of this spring body (10), in which an elastic band plate is bent into a flat loop shape so that no concentrated stress is generated, and both ends of the part corresponding to the bottom surface are bent. are opposed to each other with a gap between them, and the bottom surface has a bolt hole (11) (11
), and a bolt hole (12) is drilled on the top surface as a mounting part for the electric motor (5).

The spring body (10) adjusts the natural frequency of the vibration system with the electric motor (5) to 1/J''2 of the frequency generated by the electric motor (5).
Set it so that it is smaller than. This spring body (10)
The natural frequency of the vibration system consisting of the electric motor (5) and the electric motor (5) is determined by the material.

The bolt holes (11) (11) on the bottom side of the spring body (10) formed as described above are placed at appropriate positions on the bottom surface of the water receiving tank (1) taking into consideration the position and size of the electric motor (5). Fit two of the four protruding bolt bodies, and tighten them using nuts. And the spring body (1
0) Align the bolt holes of both ear parts of the electric motor (5) with the bolt holes (12) (12) on the other side, respectively, and then tighten the nuts to fixedly 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 as 2 below.

1+ (2・C/CC-W/Wn)”(1-w2
7w2, )2 + (2・c/cC-w/w2
)"W...frequency of vibration on the applying side w,...natural frequency of the vibration system c/cc...frequency attenuation rate In the present invention, the vibration consisting of the spring body (10) and the electric motor (5) Let the natural frequency W of the system be the generated frequency of the electric motor (5) (
Since w)w in the above equation (1) is set to be smaller than 1/f2, the α of the above (1) 2, that is, the vibration transmission speed is 1
becomes smaller and the amplitude decreases.

If we take the equation w/w, , =, α−1<(1−to2)2−・−1−−−(2),/”−
From 2<k, the value w, < 1/, I'2 ・w can be derived.

In addition, the elasticity of the spring body (10) gives deflection to the spring body (10) 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 the first embodiment, as a means for attaching the spring body (10) to the lower surface of the bottom of the water receiving tank (1), bolt holes (11) (11) are bored in the spring body (1o), and a Nando is used. However, the present invention is not limited to this, and as a second embodiment, as shown in FIGS. Bend the tip inward at right angles and attach the fixing flange (13) (1
3) may be formed.

In this case, this flange (13) of the spring body (10) (
13) Fix the spring body (10) to the water tank (1) by placing the molding 1 on the lower surface of the bottom of the water tank (1).

Thereby, the spring body (10) is integrally fixed to the water receiving tank (1), and the natural frequency of the vibration system consisting of the spring body (10) and the electric motor (5) can be further reduced.

〔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.

Furthermore, since stress is prevented from concentrating on the spring body,
This can improve durability.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional side view of a washing machine equipped with the electric motor mounting device of the present invention, Fig. 2 is a perspective view of a spring body, Fig. 3 is a longitudinal sectional side view of a washing machine showing a second embodiment, and Fig. 4. 5 is a perspective view of a spring body which is a main part of the same as above, FIG. 5 is a longitudinal sectional side view of a mounting portion of the spring body, and FIG. 6 is a longitudinal sectional side view of a conventional washing machine. (1)...Water tank (2)...Washing/dehydration tank (3)...Rotary blade (4)...Drive device (4
a) Spring clutch mechanism (4b) Brake mechanism (5) Electric motor (7) Rib (9) Hanging rod (10) Spring body (12) ...Bolt hole (6) ...Belt (8) ...Outer box (9a) ...Spring (11) ...Bolt hole (13) ...Flange

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, the natural frequency of the vibration system is set to be smaller than 1/√2 of the frequency generated by the motor, and the elastic band is A washing machine motor mounting device characterized in that a spring body having a plate bent into a loop shape so as not to generate concentrated stress is attached to the lower surface of the bottom of a water receiving tank, and the motor is directly suspended by the spring body.