JPH0458995A - Washing machine - Google Patents

Abstract

PURPOSE:To effectively suppress the vibration transmission extending from a bracket of a motor to a motor supporting plate by a buffer action of a buffer member, and to effectively lower the noise caused by the motor by constituting a driving unit by assembling in advance the motor, the motor supporting plate and plural pieces of buffer members, and attaching the motor supporting plate to an outer bottom part of a water receiving tank. CONSTITUTION:A rotation of a motor 5, that is, a rotation of a rotary shaft 5a is transmitted to washing shaft 4a of a driving part 4 through a motor pulley 23, a belt 25 and a washing pulley 24, and the driving part 4 rotates a stirring blade at the time of washing and rinsing, and rotates a rotary tank 3 at the time of dehydration. In connection with the rotation of the motor 5, a mechanical vibration and an electromagnetic vibration are generated from the inside of the motor 5, and these vibrations are transmitted to the upper and the lower brackets 7, 8, as well. Between the upper and the lower brackets 7, 8 and a motor supporting plate 10, three pieces of buffer members 12 are installed, therefore, the vibrations of the upper and the lower brackets 7, 8 are attenuated and absorbed effectively by a buffer action of the buffer members, and the vibration transmission to the motor supporting plate 10 is suppressed.

Description

Detailed Description of the Invention [Objective of the Invention (Industrial Application Field) The present invention relates to a washing machine in which a motor is supported at the outer bottom of a water receiving tank, and particularly relates to a washing machine that can reduce noise caused by the motor. .

(Prior Art) A washing machine, such as a dehydrating washing machine, transmits the rotation of a motor to a drive unit provided at the outer bottom of a water tank via a belt transmission mechanism. A plurality of motor mounting bosses are provided on the outer bottom to protrude downward, and the motor bracket is screwed to these bosses from below.

(Problems to be Solved by the Invention) In recent years, reducing noise caused by motors has become an important technical issue in the field of washing machines as well.

In the conventional configuration described above, the bracket of the motor is directly connected to the boss on the outer bottom of the water tank, so mechanical vibrations and electromagnetic vibrations of the motor are transmitted through the bracket and the boss. This has the disadvantage that the noise is transmitted to the water tank, causing the water tank to resonate, increasing the noise.

In order to eliminate these conventional drawbacks, a motor support plate is attached to the boss of the water tank with screws, and a motor bracket is attached to this motor support plate with bolts and nuts via a plurality of buffer members. However, if such a configuration is adopted, the following new problems will arise that need to be solved.

(1) Since a large number of parts such as a motor support plate, a plurality of buffer members, and bolts and nuts are newly required, assembling the motor to the outer bottom of the water tank becomes troublesome.

(2) When the tension of the belt of the belt transmission mechanism acts on the motor, some of the buffer members receive compressive force and others receive tensile force, and the buffer members that receive the tensile force deteriorate.

(3) When the tension of the belt of the belt transmission mechanism acts on the motor, the motor tilts and the belt also tilts, causing abnormal wear on the bearings of the motor due to uneven loads.

(4) When the buffer member swings not only vertically but also horizontally (back and forth, left and right) to absorb vibrations of the motor, the motor collides with the motor support plate and generates new collision noise.

Therefore, the first object of the present invention is to provide a washing machine that can not only effectively reduce noise but also simplify the assembly of the motor to the water tank and prevent deterioration of the buffer member. It is on offer.

The second object of the present invention is to effectively reduce noise, simplify the assembly of the motor to the water tank, and reduce the weight to 1 ton, as well as prevent abnormal wear of the motor bearing due to belt inclination. There is a washing machine that can be provided.

A third object of the present invention is to effectively reduce noise and simplify the assembly of the motor to the water tank, as well as to prevent collision noise caused by lateral vibration of the buffer member. There is a washing machine provided.

[Structure of the Invention] (Means for Solving the Problems) The washing machine according to claim 1 includes a driving section provided at the outer bottom of the water receiving tank, and a motor connected to a motor support plate via a plurality of buffer members. a drive unit, the motor support plate being attached to the outer bottom of the water receiving tank; and a transmission mechanism for transmitting the rotation of the motor of the drive unit to the drive section; A plurality of buffer members are arranged in a distributed manner so as to be shifted to each side from a center line that divides the motor into a drive unit side and a non-drive unit side in plan view, and the buffer members on the drive unit side are - A buffer member on the side opposite to the drive section is installed between the motor bracket and the motor support plate located below this. It is characterized by its configuration.

A washing machine according to a second aspect of the invention includes a drive section, a drive unit, and a belt transmission mechanism as in the first aspect, and the drive unit or the belt transmission mechanism is caused by tilting of the motor due to the tension of the belt of the belt transmission mechanism. A feature of the belt is that it has a correction means for correcting the inclination of the belt.

A washing machine according to a third aspect of the present invention includes a drive section, a drive unit, and a belt transmission mechanism as in the first aspect, and the distance between each part of the motor in the drive unit and the motor support plate in the horizontal direction is set as the above-mentioned. It is characterized by a configuration in which the amplitude value in the lateral direction is set larger than the amplitude value in the lateral direction of the buffer member.

(Function) According to the washing machine according to claims] to 3, the motor support plate;
Since the motor and the plurality of buffer members are assembled in advance to form a drive unit, the drive unit can be attached to the outer bottom of the water tank as is, and therefore, the motor can be easily assembled to the water tank.

Further, according to the washing machine according to claim 1, when tension by the belt of the belt transmission mechanism acts on the drive motor of the drive unit, the bracket of the motor located on the drive unit side and the motor support plate located above this A compressive force is applied to both the buffer member interposed between the motor bracket and the motor support plate located below the motor bracket located on the opposite side of the drive unit. , deterioration of the buffer member can be prevented.

Furthermore, according to the washing machine according to claim 2, even if the belt becomes tilted due to the tilt of the motor due to tension of the belt of the belt transmission mechanism, the drive unit or the correcting means of the belt transmission mechanism corrects this. Therefore, it is possible to prevent abnormal wear caused by an uneven load on the bearing portion of the motor due to the inclination of the belt.

According to the washing machine according to claim 3, even if the buffer member swings not only in the vertical direction but also in the horizontal direction to absorb vibrations of the motor, the distance between each part of the motor and the motor support plate in the horizontal direction is Since the dimensions are set to be larger than the lateral amplitude value of the buffer member, each part of the motor will not collide with the motor support plate, making it possible to prevent collision noise from occurring.

(Example) Hereinafter, a first example of the present invention will be described based on FIGS. 1 to 5.

First, in FIG. 5 showing the overall configuration, reference numeral 1 denotes an outer box of a washing machine, for example, a dehydrating washing machine. A water receiving tank 2 is installed inside the outer box 1 via an elastic suspension mechanism (not shown). Supported. A rotary tank 3 is rotatably disposed in the water receiving tank 2, and a stirring blade (not shown) is provided at the inner bottom of the rotary tank 3.
is installed. Reference numeral 4 denotes a drive unit that selectively transmits the rotation of a motor 5, which will be described later, to the stirring blades and the rotating tank 3;
It is located at the center of the outer bottom of the.

The support structure of the motor 5 will be explained based on FIGS. 1 and 4. The motor 5 has upper and lower brackets 7° and 8 that clamp and fix the stator core 6. At the left end of the bracket 7, a take-out plate part 7a is formed, and on both sides of the right end of the lower bracket 8, mounting pieces 8a, 8a are formed.

Reference numeral 9 denotes, for example, four boss portions that protrude downward at the location where the motor 5 is disposed at the outer bottom of the water receiving tank 2, and these boss portions 9 are provided with two flange portions 10a of the motor support plate 10.
The screws 1 are inserted from below through the screw insertion holes 10b, so that the screws are tightened securely. This motor support plate]
0 is formed into a substantially horseshoe shape (U-shape) when viewed from above, and the motor 5 is disposed so as to be fitted inside this. ] 2 is a buffer member formed into a short cylinder shape from rubber such as CR or NBR, and the upper part 1 of this buffer member 12 is
Poles 13 and 14 are fixed to both lower end faces in the following manner. That is, as shown in FIGS. 2 and 3, flanges 13a, 14a are integrally formed at the base of the bolt 13.14, and the flanges 13a, 14a and the end surface of the buffer member 12 are firmly connected. It is glued. Such a buffer section tJ'
1.2 are arranged at multiple locations around the motor 5, for example at three locations.

As shown in FIG. 2, in the two right buffer members 12, the lower bolts 14 are inserted from above into the bolt insertion holes 15 formed in the mounting piece 8a of the lower bracket 8 of the motor 5. , attach the motor support plate 1 to the upper bolt 13.
0 is inserted from above, and in this state, insert nuts 1 into bolts 1.3 and 1.4 on both upper and lower sides
．． 7, 1.8 are tightened. In addition, in one buffer portion 12 on the right side, as shown in FIG. 3, the lower bolt 14 is inserted from above into the bolt insertion hole 19 formed in the motor support plate 10, and the upper bolt 13 is inserted. motor 5
A bolt insertion hole 20 formed in the mounting plate portion 7a of the upper bracket 7 is inserted from above, and in this state, nuts 17 and 18 are tightened on the bolts 13 and 14 on both the upper and lower sides. As previously described, the motor 5 is attached to the motor support plate 10 via the three buffer members 12, and thus,
A drive unit 21 is constructed, and this drive unit 21 is assembled to the outer bottom of the water tank 2 by attaching the flange portion 10a of the motor support plate 10 to the boss portion 9 of the water tank 2 with screws 11. ing. In this way, motor 5. Motor support plate 10 and three buffer members 1
Since the second unit can be treated as an integrated drive unit 21, it can be easily attached to the water receiving tank 3.

Reference numeral 22 denotes a belt transmission mechanism, in which a motor pulley 23 is fitted on the rotating shaft 5a of the motor 5 that protrudes downward, and a washing pulley 24 is fitted on the washing shaft 4a of the drive section 4 that protrudes downward. A belt 25 is passed around the mota pulley 23 and the wash pulley 24.

Now, the arrangement of the three buffer members 12 mentioned above will be further explained with reference to FIG. 4.

The motor 5 is divided into two parts, a driving part 4 side A and a non-driving part 4 side B, by a center line (a) passing through the axis O of the rotating shaft 5a when viewed in plan. The two buffer members 12, 1.2 of the buffer members 12 are arranged to be shifted toward the drive unit 4 side A from the center line l!a, and pass through the axis O and are orthogonal to the center line la. The three buffer members 12 are arranged to face each other across the center line 1b.
The remaining one buffer member 12 of the center line /! The center line l! It is placed on b. A line connecting the centers of these three buffer members 12 is set to form an equilateral triangle whose center of gravity is the axis O of the rotating shaft 5a.

Next, the operation of this embodiment will be explained.

When the washing operation is performed, the rotation of the motor 5, that is, the rotation shaft 5
The rotation of a is caused by motor pulley 23. The water is transmitted to the washer 4a of the drive unit 4 via the belt 25 and the wash pulley 24, and the drive unit 4 rotates the stirring blade during washing and rinsing, and rotates the rotary tank 3 during dewatering. On this occasion,
As the motor 5 rotates, mechanical vibration is also transmitted from inside the motor 5 to the kerato 7.8. However, since three buffer members 12 are interposed between the upper and lower brackets 7.8 and the motor support plate 10, the upper and lower brackets 7.

Vibrations of the lower bracket 7.8 are effectively damped and absorbed by the buffering action of the buffer member 12, and transmission of vibrations to the motor support plate 10 is suppressed. In this case, the top.

Even if the vibration of the lower bracket 7.8 is slightly transmitted to the motor support plate 10 via the buffer member 12, the motor support plate 10 has a horizontal plate portion, a vertical plate portion, etc. from the buffer member 12 portion to the boss portion 9 portion. Since there is a span of , the motor support plate 1
The vibration transmitted to the boss portion 9 is absorbed by the span and is not transmitted to the boss portion 9. Therefore, it is possible to prevent the water tank 2 from resonating due to the vibration of the motor 5, and the noise caused by the motor 5 can be effectively reduced.

On the other hand, when the tension of the belt 25 of the belt transmission mechanism 22 acts on the rotating shaft 5a of the motor 5, the motor 5 becomes inclined in the direction of arrow C in FIG. As a result, the anti-drive section 4
A compressive force acts on one buffer member 12 located on side B of the motor 5 and interposed between the upper bracket 7 of the motor 5 and the motor support plate 10 below this, and The compressive force also acts on the two buffer members 12 interposed between the lower bracket 8 of the motor 5 and the motor support plate 0 above it. In this case, CR, NB
The shock absorbing members 12 made of rubber such as rubber have low strength against tension and are easily deteriorated, but as mentioned above, when the tension of the belt 25 acts on the motor 5, the three shock absorbing members 12 Since compressive force acts on all of the buffer members 12, deterioration of the buffer member 12 can be prevented.

6 to 9 show a second embodiment of the present invention, and the same parts as in the first embodiment are denoted by the same reference numerals, and only the different parts will be explained below.

As shown in FIG. 9, the upper bracket 7' of the motor 5 is formed with a mounting plate part 7a' similar to the mounting plate part 7a of the upper bracket 7, and a mounting piece part 8a of the lower bracket 8. , 8a are formed with mounting pieces 7b', 7b'. Therefore, the lower bracket 8' is not formed with attachment pieces such as the attachment pieces 8a, 8a. Then, the mounting plate part 7a' and the mounting piece part 7b of the upper bracket 7'
'7b' and motor support plate 1 located below this
0 and three buffer members] 2 are interposed between them (see FIG. 8). Furthermore, as shown in FIGS. 6 and 7, the protrusion dimension of the two boss portions 9' located on the side B opposite to the driving portion 4 is the same as that of the two boss portions 9 located on the side A of the driving portion 4. It is set smaller than the protrusion dimension E (D<E). Therefore, the flange portion 10a of the motor support plate 10 in the drive unit 21
When the motor supporting plate 10 is attached to the boss portion 9.9' with the screw 11, as shown in FIG. , the motor 5 is also in a tilted state with the lower end of its rotating shaft 5a pointing diagonally downward to the left, and thus the drive unit 21 has been corrected. And the sixth
As shown in the figure, when the belt 25 is passed between the motor pulley 23 and the wash pulley 24, the tension horn of the belt 25 acts on the rotating shaft 5a of the motor 5, causing the motor 5 to tilt in the direction of arrow C. (As a result, the rotating shaft 5a of the motor 5 becomes vertical, and the motor pulley 23 becomes horizontal, so that the belt 25 is corrected to the horizontal state without tilting. Therefore, the rotating shaft 5a of the motor 5 becomes vertical. Belt 2 to 5a
Since the horizontal state of the belt 25 can be maintained even when the tension of 5 is applied, an unbalanced load is not applied to the bearing portion of the motor 5, and abnormal wear of the bearing portion can be prevented.

In this second embodiment, when the motor 5 is tilted in the direction of arrow C due to the tension of the belt 25, a compression force acts on the buffer member 12 located on the side B opposite to the drive section 4, and the drive section 4 A tensile force will act on the buffer member 12 located on side A. However, the buffer member 12, which is constructed by bonding the flanges 13a and 14a of the bolts 13 and 14 to both end faces,
The strength against compressive force is large, and the strength against tensile force is relatively small, but as in this second embodiment, one The side where the buffer members 12 are arranged and the tensile force acts (the drive unit 4
By arranging two buffer members 12° 12 on side A), sufficient strength can be obtained even on the side where tensile force is applied.

Also, according to this second embodiment, for some reason,
Even if the nuts 17 and 18 become loose and come off, the motor support plate 10 is located directly below the upper bracket 7' of the motor 5, so the upper bracket 7' can be supported by the motor support plate 10. Therefore, the risk of the motor 5 falling off can be avoided. In this case, the motor support plate 10 is attached to the boss portion 99' of the water receiving tank 2 with screws 11, but the buffer member 1
2 suppresses vibration transmission to the motor support plate 10, the screws 11 do not loosen, and the motor support plate 1
0 will not fall off from the boss portion 9.9' of the water receiving tank 2.

FIGS. 10 and 11 show a third embodiment of the present invention,
The same parts as in the first and second embodiments are denoted by the same reference numerals, and only the different parts will be explained below.

That is, the four bosses 9 of the water tank 2 have the same protruding dimensions as in the first embodiment, and therefore the motor support plate 1
0 is horizontally attached to the outer bottom of the water receiving tank 2.

On the other hand, as shown in FIG. 11, the height dimension F of the buffer member 12' on the left side (the side B opposite to the drive section 4 in FIG. 9) is
is the buffer member on the right side (drive section 4 side A in FIG. 9)]2
The motor 5 is set to be larger than the height G (F>G), and therefore the motor 5 is installed in an inclined state with the lower end of the rotating shaft 5a pointing diagonally downward to the left, thereby driving the motor 5. Corrective measures have been taken on Unit 21. When the belt 25 is passed between the motor pulley 23 and the wash pulley 24, the tension of the belt 25 acts on the rotating shaft 5a of the motor 5, causing the motor 5 to move in the direction of arrow C, as shown in FIG. Therefore, the rotation axis 5 of the motor 5
a becomes vertical, and the inclination of the belt 25 is corrected and becomes horizontal.

Therefore, this third embodiment can also provide the same effects as the second embodiment.

FIGS. 12 and 13 show a fourth embodiment of the present invention,
The same parts as those in the third embodiment are denoted by the same reference numerals, and only the different parts will be explained below.

That is, the three buffer members 12 have the same height dimension, and instead, as shown in FIG. setting, the installation of the motor pulley 23' creates a step H between the horizontal line j7c at the position j7c and the horizontal line Ωd at the position J As shown in FIG. The tension applied causes the motor 5 to tilt in the direction of arrow C.

As a result, the rotating shaft 5a is slightly tilted to the right, the left side of the motor pulley 23' is moved downward, and the belt 25, which has been hung, is aligned with the horizontal line βb. , held in a horizontal position without tilting. In this case, although the motor pulley 23' is slightly inclined, the belt 25 is securely engaged with the left half of the motor pulley 23', so the belt 25 will not come off the motor pulley 23'.

Therefore, the fourth embodiment also provides the same effects as the second embodiment.

14 to 16 show a fifth embodiment of the present invention,
The same parts as in each of the above embodiments are denoted by the same reference numerals, and only the different parts will be explained below.

That is, when the washing operation is performed, mechanical vibrations are generated from inside the motor 5 as the motor 5 rotates.

Electromagnetic vibration is generated, and in order to prevent this vibration from being transmitted from the upper bracket 7' to the motor support plate 1o, the buffer member 12 swings vertically (up and down) to absorb the vibration. do. In this case, the buffer member 12
As shown in Figure 5, it swings not only vertically but also horizontally (back and forth, left and right), and its horizontal amplitude value is
are the height dimension of the buffer member 12, the spring constant and the buffer member 1
It is determined by the load applied to 2.

Accordingly, in this fifth embodiment, as shown in FIG. The horizontal spacing between the inner circumferential edge 10c and the horizontal spacing J between the mounting piece 7b' of the upper bracket 7' and the vertical plate 10d of the motor support plate 1° is determined by the amplitude value. This is set to 1 person (J>1).

As a result, according to the fifth embodiment, even if the buffer member 12 swings laterally by the amplitude value I, in other words, even if the motor 5 swings back and forth by the amplitude value I and in the left-right direction, Mounting piece 7b of stator core 6 and upper bracket 7'
The inner peripheral edge 10c and the vertical plate part 1 of the motor support plate 10
There is no collision at 0d, and therefore, generation of new noise, such as collision sound, can be prevented.

[Effects of the Invention] Since the present invention is as explained below, the following effects can be obtained.

According to the washing machine according to any one of claims 1 to 3, a motor.

The motor support plate and a plurality of buffer members are assembled in advance to form a drive unit, and the motor support plate of this drive unit is attached to the outer bottom of the water tank, so vibrations are transmitted from the motor bracket to the motor support plate. The noise caused by the motor can be effectively suppressed by the buffering action of the buffer member, and the noise caused by the motor can be effectively reduced, and the motor can be easily assembled to the water tank.

Further, according to the washing machine according to claim 1, when the tension of the belt of the belt transmission mechanism acts on the motor in the drive unit, compressive force is applied to all of the plurality of buffer members of the drive unit. , deterioration of the buffer member can be prevented.

Furthermore, according to the washing machine according to claim 2, even if the tension of the belt of the belt transmission mechanism acts on the motor of the drive unit and the motor is tilted, the tilt of the belt is corrected to maintain the belt in a horizontal state. Therefore, it is possible to prevent abnormal wear of the support portion of the motor due to unbalanced loads.

According to the washing machine according to claim 3, the distance between each part of the motor and the motor support plate in the horizontal direction is set to be larger than the amplitude value in the horizontal direction of the buffer member, so that vibrations are absorbed. Even if the buffer member swings laterally, each part of the motor will not collide with the motor support plate, and generation of noise due to collision noise can be prevented.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention.
The figure is a side view of the surrounding area of the motor, Figures 2 and 3 are longitudinal cross-sectional views of the buffer member, Figure 4 is a top view of the motor mounted on a motor support plate (= J-digit state), and Figure 5 is a partial view of the motor. FIG. 6 is a side view of the entire structure cut away. FIGS. 6 to 9 show a second embodiment of the present invention; FIG.
6 is a view corresponding to FIG. 1, FIG. 7 is a view corresponding to FIG. 6 with the belt removed, and FIGS. 8 and 9 are views corresponding to FIGS. 3 and 4, respectively. Furthermore, FIGS. 10 and 11 are views corresponding to FIGS. 6 and 7, and FIGS. 12 and 13, respectively, showing a third embodiment of the present invention.
The figures correspond to FIGS. 6 and 7, respectively, showing a fourth embodiment of the present invention. 14, FIG. 15, and FIG. 16 are views corresponding to FIG. 1, FIG. 7, FIG. 3, and FIG. 4, respectively, showing a fifth embodiment of the present invention. In the drawing, 2 is a water tank, 3 is a rotating tank, 4 is a drive unit, 5 is a motor, 6 is a stator core, 7 and 7' are upper brackets,
8 and 8' are lower brackets, 9 and 9' are boss parts, 10
1 is a motor support plate, 12 and 12' are buffer members, 21 is a drive unit, 22 is a belt transmission mechanism, 23 and 23' are motor pulleys, 24 is a washing pulley, and 25 is a belt. Figure 13 Figure 15

Claims (1)

[Scope of Claims] 1. A drive unit provided at the outer bottom of the water tank, and a motor attached to a motor support plate via a plurality of buffer members, the motor support plate being attached to the outer bottom of the water tank. and a belt transmission mechanism that transmits the rotation of the motor of the drive unit to the drive unit, and the plurality of buffer members of the drive unit are configured to connect the motor to the drive unit side in plan view. The buffer members on the drive unit side are distributed so as to be offset from the center line dividing the motor into A washing machine characterized in that the buffer member on the opposite side of the drive section is interposed between the bracket of the motor and the motor support plate located below the bracket. 2. A drive unit comprising a drive unit provided at the outer bottom of the water tank, and a motor attached to a motor support plate via a plurality of buffer members, and the motor support plate is attached to the outer bottom of the water tank. and a belt transmission mechanism that transmits the rotation of the motor of the drive unit to the drive section, and the drive unit or the belt transmission mechanism is configured to reduce the inclination of the belt caused by the inclination of the motor due to the tension of the belt of the belt transmission mechanism. A washing machine characterized in that it has corrective means for correcting. 3. A drive unit comprising a drive unit provided at the outer bottom of the water tank, and a motor attached to a motor support plate via a plurality of buffer members, and the motor support plate is attached to the outer bottom of the water tank. and a belt transmission mechanism for transmitting the rotation of the motor of the drive unit to the drive section, and the distance between each part of the motor in the drive unit and the motor support plate in the horizontal direction is equal to the width of the buffer member. A washing machine characterized in that the amplitude value of the direction is set larger than the amplitude value of the direction.