JPH0330398B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a speed reduction device for an electric washing machine.

Conventional structure and problems The planetary gear reduction device conventionally used in household electric washing machines transmits the power of the drive motor to the rotor blades, so synthetic resins are made of materials with high physical strength (for example, glass-filled polyester). resin) was used. However, materials with high physical strength require high material costs, which poses a problem in reducing the cost of the reduction gear component parts.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and aims to use a material with relatively low physical strength and change its shape so that it can be used as a speed reduction device for a washing machine. .

Structure of the Invention In order to achieve the above object, the speed reduction device for an electric washing machine of the present invention includes a rotary blade at the lower center end of an inner tub for washing and dewatering, and an outer tub on the outside of the inner tub,
Connecting the lower end side of the rotary blade shaft connected to the rotary blade to the output side of a planetary gear reduction gear consisting of a sun gear, planetary gears each made of synthetic resin, an internal gear, a support frame, and a support body, In an electric washing machine in which a pulley that receives rotation of an electric motor is attached to the lower end of a shaft of a sun gear serving as an input side of the planetary gear reduction device, the device is fixed to a plurality of pillars provided on a support frame of the planetary gear reduction device. The supporting body is provided with hanging ribs that sandwich the pillars.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is the outer box, 2 is the outer box 1
This top plate 2 covers the top of the washing machine, and control parts for the washing machine (water level switch, water supply valve, time switch, etc.) are housed inside this top plate 2. Reference numeral 3 denotes an upper lid, which is pivotally supported on the top plate 2 so as to be openable and closable.
5 is an inner tank for washing and dehydration that has small holes in the side wall.
Outside the inner tank 5, an outer tank 4 is suspended and supported via a slider 6 and a suspension rod 7 by a buffer tube 8 having a built-in anti-vibration spring (not shown). Further, the inner tank 5 is fixed to the inner tank cylindrical shaft 10 via a flange 9 provided at the lower end. A hollow brake drum 11 is fixed to the lower end of this inner tank cylindrical shaft 10, and a drum receiver 12 having a flange at the upper end and a spline shape at the lower end is attached to the brake drum 11 through the flange. It is fixed. A large pulley 13 for dewatering is attached to the lower end of the drum receiver 12, and
It is connected via a belt 14 and a small pulley 15 to an electric motor 16 dedicated to dewatering. The inner tank cylinder shaft 10
The drum bearing 12 is supported by a bearing cover 17 and a bearing case 18. The bearing cover 17 and the bearing case 18 are fixed to the bottom plate 19,
The bottom plate 19 is fixed to the bottom of the outer tank 4. 20
is a rotor blade located at the center lower end of the inner tank 5, which is fixed to the rotor shaft 21 and arranged concentrically with the inner tank cylinder shaft 10, and the lower end of the rotor blade 21 is located inside the brake drum 11. A support frame 24, which is attached to a support body 22 of a planetary gear reduction device provided in the present invention and rotatably houses a planetary gear 25, is fixed to the support body 22. 23 is an internal gear, and the drum receiver 1
It is attached and fixed by a pin protruding from the flange of 2. Note that the support body 22, the internal gear 23, and the support frame 2
4. The planetary gears 25 are both made of synthetic resin. A pulley shaft 26 concentrically engaged with the cylindrical portion of the drum receiver 12 has an upper end formed into a sun gear, and a lower end connected and fixed to a large laundry pulley 28 via a collar 27 with a nut 29. Large laundry pulley 28 is V-belt 30 and small pulley 3
1 to an electric motor 32 dedicated to washing. Regarding the planetary gear reduction device, Figs. 7 to 1
To explain in more detail based on FIG. 2, the internal gear 2
The lower end of the gear pin 47 is inserted into the gear pin receiving recess 24a formed in the support frame 24, which is inserted from the lower part of the gear pin 47. A planetary gear 25 is installed on the gear pin 47, and the upper end of the gear pin 47 is connected to the support 22.
is inserted into the recess 22a. The planetary gear 2
5 are equally distributed on the internal gear 23. The planetary gear 25 also has a bearing hole 25a that supports the gear pin 47.
A seat surface 25b is formed at the lower end of this bearing hole 25a. A flat part 23 is provided on the upper surface of the lower part of the internal gear 23.
a is formed, and a groove portion 23b is formed in the flat surface portion 23a in an annular shape. The groove portion 23
b is in a positional relationship in which it comes into contact with the seat surface 25b of the planetary gear 25. A solid lubricant such as grease is adhered to the groove portion 23b, and as the sun gear (pulley shaft 26) rotates, the planetary gear 25 rotates around the gear pin 47, and the inside of the internal gear 23 rotates. makes an orbital motion. At this time, the grease in the groove 23b is evenly applied to the seat surface 25b, smoothing the rotation of the planetary gear 25,
Reduction of noise due to rotation of planetary gear 25 and seat surface 25b
can prevent wear. On the other hand, the support frame 24
A plurality of substantially square columnar pillars 24b are formed between the recesses 24a, and a cylindrical shaft portion 24c is formed at the upper end of each pillar 24b. This shaft portion 24c is inserted into a hole 22b formed at a position corresponding to the shaft portion 24c of the support body 22 and fixed by means such as welding. Further, on the lower surface of the support body 22, as shown in FIG.
A hanging rib 22c is formed so as to sandwich the pillar portion 24b in the state inserted into the pillar portion 24b. By the way, in the case of a speed reduction device for rotary blades for washing, the load torque applied to the rotary blades varies depending on the type of cloth and the amount of cloth being washed, and since the rotary blade is a cleaning method that repeats reversal motion, the above-mentioned multiple If the load is to be received by the shaft portion 24c alone, the outer diameter of the shaft portion 24c must be increased or the height of the shaft portion 24c must be increased in the case of the component made of synthetic resin material. It is necessary to use an expensive resin material with strong physical properties, which causes problems such as an increase in the unit cost of the component parts. However, by bringing the hanging ribs 22c of the support body 22 into contact with the pillar portions 24b, it is possible to improve the strength of the support frame 24 and the support body 22 after they are attached.

The large pulley 13 for dehydration attached to the drum support 12 connected to the inner tank cylindrical shaft 10 has cylindrical ribs 13a and 13b formed on the upper and lower sides, and the upper rib 13a is connected to the lower part of the bearing case 18. The inner diameter of the cylindrical portion is larger than the outer diameter of the cylindrical portion to prevent grease, etc. dripping from the bearing from scattering onto the V-belt 14 portion. The lower end of the lower cylindrical rib 13b is located in the recess below the upper end of the recess on the upper surface of the large washing pulley 28 located below the large pulley 13 for dewatering. 33 is a brake band, one end of which is supported by the brake shaft 35;
The other end has a small hole 33a for screw attachment and a seat surface 33b, and the end is bent into an L shape. 33
c is the bent part. This brake band 33 is wound around the brake drum 11, and is wrapped around the bearing case 1.
The bent portion 33c is engaged with the square hole 18a formed in the body wall of No. 8, and the screw hole 1 is inserted with the mounting bolt 39.
It is fixed to the part 8b. Reference numeral 38 denotes an operating lever, the tip of which is supported together with the brake band 33 on the brake shaft 35. 36 is an operating lever shaft, and a flange portion 36a is formed at the upper end.
The operating lever shaft 36 is supported at both upper and lower ends through a small hole 18c formed in the upper flange of the bearing case 18 and a small hole 18d formed in the bent portion of the body wall of the bearing case 18. A spiral spring 37 and an operating lever 38 are disposed between 18c and 18d, and a cylindrical receiver 40 is disposed below them. Further, at the mounting portion of the operating lever shaft 36, the upper end of the operating lever shaft 36 contacts the lower surface of the bearing cover 17 that contacts the lower surface of the bottom plate 19, and the upper end of the flange 36
a is received by the upper flange of the bearing case 18, and has a structure that it cannot be removed when the bearing cover 17 and the bearing case 18 are attached to the bottom plate 19. Further, the helical spring 37 has one end in contact with the body of the bearing case 18 and the other end in engagement with the actuating lever 38, so that the brake liner 34, which is normally fixed to the brake band 33, is brought into contact with the brake drum 11. , operating lever 3 to generate braking force during washing and spin-drying.
8 is energized. Further, the helical spring 37 is tightly wound, and its upper end is connected to the bearing case 18.
The actuating lever 38 is brought into contact with the lower surface of the upper flange of the
The lever 38 is configured to press downward, thereby eliminating vertical wobbling of the operating lever 38. The braking force of the brake drum 11 is used to rotate the inner tub 5 in the same direction as the rotary blade 20 when stopping the rotation of the inner tub 5 during dewatering and when the rotary blade 20 is rotating during washing. This is necessary when preventing Conversely, the braking force must be released when the inner tank 5 rotates for dewatering. 44 is a solenoid which releases the braking force and opens and closes the drain valve at the same time, and the braking force is inevitably released during the draining process as well. When releasing the braking force, use solenoid 44
When energized, the plunger 44a is attracted, and the actuating piece 41 connected to the plunger 44a by a pin 45 and the actuating lever 3 are connected to the actuating piece 41.
The actuating lever 38 is rotated by an actuating metal fitting 43 which is fixed so that its relative position with respect to the brake band 8 can be freely adjusted, thereby releasing the braking force between the brake band 33 and the brake drum 11. At the same time, the drain valve 42 is also opened to allow water to flow. In general, the characteristics of the brake band system are that the sound during operation (when applying braking force) is relatively quiet due to its structure, and there is a large difference between the braking force on the rolling side and the braking force on the non-rolling side. That's true. When stopping the rotation of the inner tank during spin-drying, there is no problem as long as the direction of rotation of the inner tank during spin-drying and the winding direction of the brake band are the same.However, when washing, the rotor blades generally rotate left and right. In order to perform the reversal, the braking force on the side opposite to the winding direction of the brake band must also be set to be greater than the force that causes the rotary blades to rotate the inner tub through the laundry. One way to improve the braking force on the side opposite to the winding side is to increase the surface pressure of the brake drum and brake liner during braking. As a way to increase the surface pressure, use the operating lever 3 of the helical spring 37.
8 may be increased, but the ratio of the dimension between the brake shaft 35 and the actuating lever shaft 36 and the dimension between the actuating lever shaft 36 and the actuating metal fitting 43 that abuts the actuating lever 38 is constant. In this case, the suction force of the solenoid 44 must be increased. However, if the suction force of the solenoid 44 is increased, the cost becomes expensive and the size becomes large, so this is not a good method. Furthermore, due to the limited space available, it is not possible to increase the dimensions of the actuating lever shaft and the portion of the actuating lever that comes into contact with the actuating metal fitting. In order to increase the contact pressure between the brake drum and the brake liner under such conditions, the dimension between the brake shaft 35 and the actuating lever shaft 36 is reduced so that the brake drum contacts the actuating lever shaft 36 and the actuating lever 38. The ratio between the dimension between the actuating metal fitting 43 and the aforementioned dimension becomes larger, thereby making it possible to cope with this problem. However, if the operating stroke of the solenoid 44 is constant, the movement dimension of the brake band when releasing the braking force becomes small, and the brake drum 11 and brake liner 34 may not be completely separated due to variations in component dimensions during production. There are cases where a part of the outer circumference of the brake drum comes into contact with the brake drum. If such a situation occurs, problems such as abnormal noises caused by the brake drum and brake liner rubbing against each other during dehydration operation and performance deterioration due to heat generation of the brake liner occur.

Therefore, in order to secure the space between the brake liner 34 and the brake drum 11, it is necessary to
By fixing one end, the wobbling during installation is reduced, and at the same time, a small hole is provided around the body wall of the bearing case 18 corresponding to the brake band 33, and a roughly conical hole made of synthetic resin is formed in the center from the tip. A brake band abutting tool 46 having a recessed portion is attached to the small hole from the outside. The tip of the brake band abutting tool 46 is close to the brake band 33, and even a small amount of movement of the brake band 33 when the braking force is released causes the brake band abutting tool 4 to close.
6 and the brake band 33 is brought into contact with the brake band 33, and the tip size of the brake band abutting tool 46 changes appropriately due to the recessed part in the center, so that an equal distance between the brake liner 34 and the brake drum 11 can be ensured.

Most of the components of the one-tub type dehydrating washing machine of the embodiment described above are attached to the bottom of the outer tub 4 and the bottom plate 19 fixed to the bottom of the outer tub 4. Also, outer tank 4
is suspended from the outer box 1, so if it is not balanced in plane with respect to the center of the outer tank 4, the distance between the outer tank 4 and the outer box 1 will not be uniform on the inside of the four sides. This causes an inconvenience in that the outer tank 4 hits the outer box 1 at the start of dehydration or during dehydration operation. As a countermeasure for this, a dewatering electric motor 16 and a washing electric motor 3
2 is set so that A>B so that the mounting dimension A from the center of the lighter motor 16 for dewatering is larger than the mounting dimension B from the center for the heavy laundry motor 32. Furthermore, in order to improve the balance, the mounting dimension C from the center of the solenoid 44 is also provided on the dewatering motor 16 side, so that the planar center of gravity of the outer tank 4 is approximately at the center of the outer tank 4, and the balance is improved. I can do it.

Effects of the Invention As described above, according to the present invention, the supporting body is provided with hanging ribs so as to sandwich the plurality of pillars of the support frame of the planetary gear reduction gear, so that the parts made of inexpensive synthetic resin can be used. The necessary mounting strength can be obtained even by using a small-sized and inexpensive reduction gear.

[Brief explanation of drawings]

The drawings show an example of the implementation of the present invention.
The figure is a longitudinal cross-sectional view of the washing machine, Figure 2 is an enlarged cross-sectional view of the drive section, Figure 3 is a back view, Figure 4 is a cross-sectional view of the bearing case, and Figure 5 is a cross-sectional view of the brake band supporter. , Fig. 6 is an exploded perspective view of the other end attachment part of the brake band, Fig. 7 is a plan view of the planetary gear reduction device, Fig. 8 is an exploded cross-sectional view of the same essential parts, and Fig. 9 is the pillar part of the support frame. FIG. 10 is a sectional view of the joint between the support frame and the support body, FIG. 11 is an enlarged sectional view showing the relationship between the planetary gear and the internal gear, and FIG. 12 is the main part of the internal gear. It is an enlarged perspective view. 1...outer box, 4...outer tank, 5...inner tank, 10...
...Inner tank cylinder shaft, 11...Brake drum, 12...
Drum support, 13...Large pulley, 14...V belt, 15...Small pulley, 16...Dewatering electric motor, 20...Rotor blade, 21...Rotor blade shaft, 22...
...Support body, 22c...Descent rib, 23...Internal gear, 24...Support frame, 24b...Pillar portion, 24c...
...Shaft portion, 25...Planetary gear, 26...Pulley shaft, 28...Large pulley, 30...V belt, 3
1...Small pulley, 32...Electric motor for washing.

Claims (1)

[Claims] 1. A rotary blade is provided at the lower center end of an inner tank for washing and dewatering, an outer tank is provided outside the inner tank, and a sun gear and a synthetic resin are connected to the lower end side of the rotor shaft connected to the rotor blade. The rotation of the electric motor is connected to the output side of a planetary gear reduction device consisting of a planetary gear, an internal gear, a support frame, and a support body, and the rotation of the electric motor is connected to the lower end of the shaft of the sun gear, which is the input side of the planetary gear reduction device. An electric washing machine equipped with a receiving pulley, wherein a support fixed to a plurality of pillars provided on a support frame of the planetary gear speed reducer is provided with hanging ribs that sandwich the pillars. .