JPS6112068Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to a washing machine equipped with a speed reduction device for rotating a pulsator at a low speed.

(B) Prior Art When a speed reducer is fixed to the outer bottom surface of a washing tub, an output shaft, which is a blade shaft protruding from the speed reducer, is inserted into the tub. Since a pulsator is attached to this output shaft within the bath, if it is not centered accurately, the pulsator will tilt and get caught in clothes, or the desired washing effect will not be obtained. Conventionally, the output shaft is supported by a reduction gear in advance, and this device is fixed to the outer bottom of the washing tub, but since the load is applied to the device during washing, the entire device cannot be fixed with just screws. In the past, a fastening method of passing a bolt between the device and the washing tub and tightening it with a nut was often used. However, with this fastening means, it is necessary to make the tank and device thick enough to withstand the tightening of the nut.
Also, when this fixation occurs, the output shaft and the mounting hole may become misaligned.
The output shaft sometimes got twisted.

(c) Purpose of the invention The purpose of this invention is to obtain high centering accuracy when fixing a speed reducer to the outer bottom surface of a washing tub. A shaped mounting hole is provided upright, and a large diameter cylindrical guide hole surrounding the mounting hole is provided vertically on the outer bottom surface of the reduction gear case. a protruding portion that is inserted substantially closely from below and a shoulder portion that is inserted substantially closely into the guide hole from below;
By inserting the case into the double tube at the top and bottom, centering can be performed with high precision. In addition, in the present invention, a groove cut into the protrusion from above is integrally formed, and a gap is integrally formed from below between the shoulder and the shaft support that pivotally supports the output shaft at the lower part of the protrusion. The thickness of the inner and outer circumferential surfaces, shoulders, and shaft parts of the protrusion are made almost equal, thereby maintaining the accuracy of the outer diameter dimensions of the outer circumferential surface of the protruding part and the shoulder, and further increasing the accuracy of centering work. It is something.

(E) Embodiment In the drawing, 1 is a two-tub type washing machine body, which has a rectangular washing tub 2 with curved corners and a dewatering tank 3 inside. The control box 4 is fixedly attached, and the lower opening is fixedly attached to the base 5. Reference numeral 6 indicates a washing motor which is driven in reverse in short cycles by a timer, and 7 a dewatering motor, both of which are fixed on the base 5. Reference numeral 8 denotes a centrifugal dehydration basket that is disposed within the dehydration receiving tank 3 and rotated at high speed by the dehydration motor 7.

Reference numeral 9 denotes a speed reducer screwed to the outer bottom of the washing tub 2, with an output shaft 10 serving as a blade shaft protruding from the center of the tub, and an input shaft 11 thereof protruding downward from a position eccentric to the output shaft 10. There is. And input shaft 11
The rotation is decelerated by the pinion gear 12 and the internal gear 13 and transmitted to the output shaft 10.

14 is a pulsator attached to the output shaft 10;
15 is a large pulley attached to the input shaft 11, 16
1 is a small pulley attached to the rotating shaft 17 of the motor 6, and 18 is a belt connecting the small pulley 16 and the large pulley 15. Here, the axes of the output shaft 10, the input shaft 11, and the rotating shaft 17 are located in a straight line in a plan view, and the rotating shaft 17 is located far from the input shaft 11, and the output shaft 10 is located between them. It is. This arrangement relationship is shown in FIG.

On the other hand, the position where the speed reducer 9 is screwed to the outer bottom of the tank is on the line connecting each axis and the line that is perpendicular to this line, as shown in FIG. When telesion of the belt 18 is applied to the entire device 9 through the shaft, the device 9 tends to flex in the axial direction, and the output shaft 1
0 is more likely to run out, but the screw position described above is the most effective position to suppress this.

Next, the mounting structure of the reduction gear device 9 and the device itself will be explained in detail based on FIG. 3. first,
The inner bottom surface of the washing tub 2 is bulged toward the center for reinforcement, and a cylindrical mounting hole 19 is provided upright in the center. 20 is a cylindrical guide hole with a large diameter (than the mounting hole 19) vertically installed in the center of the outer bottom surface;
1 is the tank outer bottom annular surface formed between the inside of the guide hole 20 and the mounting hole 19, 22... is the guide hole 20
The reinforcing ribs 23... are connected to the outer peripheral wall of the outer bottom surface and protrude radially from the outer bottom surface of the reinforcing ribs 22...
This is a downward facing boss integrally formed on the four ribs corresponding to the screw-fastening position. 24... are reinforcing ribs that connect the outer circumferential wall of the mounting hole 19 and protrude radially from the inner bottom surface, and cooperate with the reinforcing ribs 22... to improve the caliber accuracy of the mounting hole 19 and the guide hole 20 and the tank. The flatness of the outer bottom annular surface 21 is maintained.

The speed reducer 9 has a cap-like upper and lower case 2 made of resin.
5 and 26 are fixed to each other by flat screws 27 at their peripheral flanges. and,
The upper case 25 is press-fitted with a protruding portion 28 that is inserted into the mounting hole 19 from below in a substantially close manner, and a shoulder portion 29 that is also inserted into the guide hole 20 in a substantially intimate manner from below and faces the tank outer bottom annular surface 21. and a shaft support 31 which pivotally supports the upper part of the output shaft 10 by means of an oil-less metal 30. The protruding portion 28 has an inner circumferential surface on which an oil seal 32 for water-sealing the periphery of the output shaft 10 is fixed, and an annular groove 33 cut from above is provided between the inner and outer circumferential surfaces. In addition, the shoulder portion 29 and the pivot portion 3
1, voids 34 are provided from below at predetermined intervals and in an annular shape as a whole.

By forming the annular groove 33 and the void 34, the thicknesses of the inner and outer peripheral surfaces of the protruding portion 28, the shoulder portion 29, and the shaft support 31 are made equal or almost equal, thereby reducing distortion during molding. , the accuracy of each outer diameter is maintained. Further, due to this, a connecting portion 35 remains in an annular shape between the annular groove 33 and the void 34 .

On the other hand, the lower case 26 has a downwardly protruding shaft support 36 vertically disposed on the lower surface thereof eccentrically with respect to the output shaft 10.
The input shaft 11 is pivotally supported by oil-less metals 37, 37 that are press-fitted within this shaft support 36.
Further, an oil-less metal 30 that pivotally supports the lower end of the output shaft 10 is press-fitted into the center of the inner surface.

Inside the upper and lower cases 25 and 26, that is, inside the reduction gear 9, an internal gear 13 fixed to the lower part of the output shaft 10 meshes with a pinion gear 12 fixed to the upper part of the input shaft 11. Further, a large pulley 15 is fixed to the lower end of the input shaft 11. Note that the tension direction of the belt 18 is indicated by an arrow in FIG.

Here, oil-less metal 3 of lower case 26
There is a stepped part 3 that receives the metal in the press-fitted part of 0 and 37.
8... and recesses 39... are formed in this order. This is because the shavings of the case generated during metal press-fitting are collected in the recesses 39. In other words, the metal press-fitting work is obstructed by the shavings, making it impossible to press-fit to the correct position, causing the shaft to tilt and become misaligned, and the shavings contaminating the metal bearing surface (inner surface). This is to ensure that nothing happens.

In this manner, the output shafts 10 and 11 are inserted, and the upper and lower cases 25 and 26 are fixedly attached with the gears 12 and 13 meshing, thereby completing the device 9. Note that this device 9 is made in advance in a separate process.

To explain the installation, first, an annular packing 40 made of a flexible material is fitted onto the shoulder portion 29, and the protruding portion 28 is inserted into the mounting hole 19, and the shoulder portion 29 is inserted into the guide hole 20 from below. Then, the packing 40 is attached to the upper surface of the shoulder portion 29, the annular surface 21 of the outer bottom of the tank,
They are pressed by the outer circumferential surface of the protrusion 28 and the inner circumferential surface of the guide hole 20 and are brought into close contact with each other, thereby providing a water seal. The seal 40 has a high water-sealing effect because it is crimped on the top and bottom, inside and outside, but in order to further improve the effect, annular protrusions 41, 41 are provided on the upper surface of the shoulder portion 29 and the annular surface 21 of the outer bottom of the tank.

During this insertion, the outer circumferential surface of the protrusion 28 is inserted into the annular groove 3.
3 makes it somewhat easier to bend, making it easier to insert it into the mounting hole 19. In addition, since the packing 40 is fitted on the upper surface of the shoulder portion 29, the shoulder portion 29
If the shoulder part 29 shifts and hits the lower end of the guide hole 20 when inserting it into the guide hole 20, the gasket 40
It softens the hit and acts like a guide. Therefore, the operation of inserting the shoulder portion 29 into the guide hole 20 becomes easier.

On the other hand, the centering work is performed using the mounting hole 19 and the guide hole 2.
0 is provided in a double-cylindrical shape on the upper and lower sides, and the protrusion 28 and the shoulder 29 are inserted into the upper and lower portions separately, so that the operation can be carried out with high precision. Furthermore, the accuracy of the outer diameters of the protrusion 28 and shoulder 29 is maintained by forming the circular groove 33 and the void 34.
This further improves the centering operation.

After this, the flanges of the upper and lower cases 25, 26 are placed against the bosses 23, and screwed from below with the tap screws 42. Then, each axis is arranged on a straight line, and the two screws 42, 42 among the tap screws 42 are also located on the straight line. When screwed, a predetermined distance t is formed between the lower surface of the reinforcing ribs 22 on the bottom of the tank and the upper surface of the upper case 25. Therefore, washing tub 2
When washing water is poured inside, the center of the bottom of the tub is pressed downward by the water pressure so as to reduce the distance t. Then, the seal 40 is pressed and the water sealing effect is improved. That is, in this embodiment, the packing 40 is a bolt,
There is no need to secure the water-sealing effect by strongly tightening nuts, and the thickness of each case 25, 26 of the speed reducer 9 and the bottom of the tank can be made thin enough to withstand the tightening stress of the screws.

A pulsator 14 is attached to the output shaft 10, and water sealing around this shaft is performed by an oil seal 32 and an oil-less metal 30 on the upper part.

To explain the operation during washing, first, the motor 6 is driven in reverse at short cycles of about 1 second by a timer or the like. Large and small pulleys 15, 16 and belt 1
Since the contact between the shafts 8 and 8 is good due to the distance between the shafts, there is almost no slippage, and the rotation of the motor 6 is firstly decelerated and transmitted to the input shaft 11. The speed reducer 9 rotates gears 12 and 1 equally on both left and right rotations.
3, the output shaft 10 is secondarily decelerated and rotated stably on both the left and right sides. As a result, the pulsator 14
is reversed at a low speed of, for example, 180 rpm and in short cycles, and washes the laundry without damaging it too much.

Since the sand coming out of the laundry during washing does not remain in the bulging center but accumulates around the bulge, it does not adversely affect the oil seal 32 etc. and is easily removed.

The meshing rotation noise of the gears 12 and 13 in the speed reduction device 9 is reduced by using lubricant or the like, but even if it occurs, the generated noise will occur in a restricted manner in both left and right rotations and will not cause discomfort.

If there is a slight misalignment in the output shaft 10 in the reduction gear device 9, the output shaft 10 will twist and rotate around its lower end, but at this time, this rotational force will be absorbed by the bending of the connecting portion 35, and the packing 40 The effect on the pressure bonding force is suppressed as much as possible, and the water sealing effect is maintained.

Further, in this embodiment, since the input and output shafts 10 and 11 are supported within the device 9, the device 9 also serves as a bearing. Since this device 9 is completed in advance in a separate process, when it is assembled into the tank 2 from below, automation and rationalization of this process are facilitated. On the other hand, it is no longer necessary to securely fasten bearings and reinforcing plates to the bottom of the tank from the inside and outside with bolts and nuts as in the past, and the wall thickness of the tank and its bottom does not need to be as thick as before. There are advantages in terms of

(F) Effects of the invention The present invention enables accurate centering work by inserting the case of the speed reducer into the upper and lower double cylinders of the washing tub, and in addition, the projecting part and shoulder of the case to be inserted can be easily aligned. By maintaining the accuracy of the outer diameter dimension, the accuracy of centering work can be further improved. Therefore, the present invention can provide a high quality washing machine.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a washing machine according to the present invention, FIG. 2 is a bottom view showing screw positions of each shaft and the speed reducer, and FIG. 3 is a cross-sectional view showing the speed reducer and its mounting configuration. 2...Washing tub, 9...Deceleration device, 10...Output shaft, 14...Pulsator, 19...Mounting hole, 20
... Guide hole, 25, 26 ... Upper and lower cases, 28
...Protrusion, 29...Shoulder, 31...Axis support, 3
3... annular groove, 34... void.

Claims (1)

[Scope of utility model registration request] In the case where the speed reduction device, which consists of an output shaft to which the pulsator is attached is pivotally supported within a resin case, is fixed to the outer bottom surface of the washing tub, a cylindrical mounting hole is provided upright on the inner bottom surface of the washing tub. At the same time, a large-diameter cylindrical guide hole surrounding the mounting hole is vertically provided on the outer bottom surface of the case, and the output shaft protrudes from the inner peripheral surface of the case and is inserted into the mounting hole. a protrusion that is inserted substantially closely into the outer peripheral surface from below; a shaft support that pivotally supports the output shaft at a lower portion of the protrusion; and a shoulder that is inserted into the guide hole substantially closely from below;
A groove provided in a shape cut from above between the inner and outer circumferential surfaces of the protruding portion and a gap provided from below between the shaft support and the shoulder portion are integrally formed, and the inner and outer circumferential surfaces of the protruding portion, A washing machine characterized in that the wall thicknesses of the shaft support and the shoulder portion are made almost equal by the grooves and gaps.