JPH0364158B2 - - Google Patents

Description

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

Conventional structure and its problems Conventionally, the brake drum used in household washing machines has its upper end fixed to a cylindrical shaft connected to the inner tank by a method such as press fitting, and the lower end has a diameter larger than that of the upper end. The brake drum was made larger and in contact with the brake band, and a speed reduction device was installed inside the brake drum to slow down the rotation of the rotor blades. The brake drum is connected to the inner tank via a cylindrical shaft, and during dewatering, the inner tank and brake drum rotate at approximately 1000 rpm.
When stopping the rotation of the inner tank, the brake band is brought into pressure contact with the brake drum to stop the brake drum, so frictional heat is generated between the brake drum and the brake band. Since the inner circumferential surface of the brake drum and the outer circumferential surface of the internal gear are in close contact with each other, the resin internal gear and other gears disposed inside the brake drum are adversely affected by heat through the metal brake drum. In order to provide this, the resin gears had the problem of having to use heat-resistant and expensive resin.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and eliminates the possibility that the heat generated by the brake band when the inner drum is stopped from steady rotation has an adverse thermal effect on the resin gear disposed inside the brake drum. It is an object of the present invention to provide a speed reduction device for a single-tub type washing machine that can prevent the heat generated during brake braking, where the outer periphery of an internal gear and the inside of the brake drum are in contact with each other, from having an adverse thermal effect on the planetary gear speed reduction device. do.

Composition of the Invention In order to achieve the above-mentioned object, the speed reduction device for a single-tub washing machine of the present invention has an inner tub as a washing/drying tub surrounded by an outer tub and having rotary blades at the center of the bottom. an inner cylindrical shaft fixed to the cylindrical shaft, a washing shaft having the rotary blade fixed to the upper end thereof, and a bearing case and a bearing cover located below the outer tub to support the cylindrical shaft and the washing shaft. a hollow brake drum and a drum bearing housed in the bearing case and the bearing cover and connected to the cylindrical shaft; A brake belt wound around a brake drum, and a planetary gear reduction device constituted by an internal gear, a planetary gear, and a sun gear and housed in the hollow brake drum and the drum receiver, A flange is provided on the outer peripheral surface of the upper part,
The flange is brought into contact with the inner circumferential surface of the side wall of the hollow brake drum, and a space is formed between the outer circumferential surface of the internal gear other than the flange and the inner circumferential surface of the side wall of the hollow brake drum, and the flange is opposed to the inner circumferential surface of the side wall of the hollow brake drum. A brake band is wound around the outer circumferential surface of a hollow brake drum.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Figure 1 is a vertical cross-sectional view of a single-tub washing machine, Figure 2 is a vertical cross-section of the braking device and deceleration device portion of the single-tub washing machine, and Figure 3 is a bearing case and operation of the single-tub washing machine. FIG. 3 is a partially cutaway plan view of the lever. In Figures 1 to 3, 1 is the outer box of the single-tub washing machine, 2 is the top plate attached to the top of the outer box 1, 3 is the lid bearing on the top plate 2, and 4 is the anti-vibration spring. An outer tank 5 is suspended from the outer box 1 by a hanger 4, and a substrate 6 is fixed to the outside of the bottom of the outer tank 5. This board 6 has
The bearing cover 9 has a dewatering electric motor 7 and a washing electric motor 8 fixed thereto, and a bearing cover 9 and a bearing case 10 which house a braking device and a deceleration device therein and are fixed concentrically with the outer tank 5.
A bearing 11 is fixed to the bearing case 10. Reference numeral 12 denotes a cylindrical shaft, the upper end of which is connected to the inner tank 14 via a coupling 13, and the lower end of which is press-fitted into the upper end of a hollow brake drum 15. A brake band 17 is wound around the body of the hollow brake drum 15. The brake band 17 has one end fixed to the bearing case 10, the other end supported by the operating lever 16, and a brake liner fixed to the inside. A stepped portion is formed on the upper outer circumferential surface of the body of the hollow brake drum 15 so that the brake band 17
The diameter is smaller than that of the abutting surface, and this stepped support is similarly formed on the inner circumferential surface. Further, a drum support 19 is fixed to the lower part of the brake drum 15, and the drum support 19 has a plurality of protrusions protruding from the upper surface, and the lower part is fixedly fitted into the lower bearing 11, and the lower part is fixed to the lower bearing 11. The cross-sectional shape is formed into a serration shape. A dewatering driven pulley 20 having a hole with a corresponding cross-sectional shape is fitted and fixed to the lower serration part of the drum receiver 19, and this dewatering driven pulley 20 is connected to the dewatering electric motor 7 by a V-belt. There is. A drive pulley 21 having a cooling fan integrally formed thereon is externally fixed to the output shaft of the electric motor 7 exclusively for dewatering.

As the electric motor 7 for dewatering rotates, the inner tank 1 is moved through the dewatering driven pulley 20 , the drum receiver 19 , the hollow brake drum 15 , and the cylindrical shaft 12 .
4 is rotated. At this time, actuating lever 1
6 is attracted in the direction of the arrow in FIG. 4 through the operating metal fitting 23 by energizing the solenoid 22, and the brake band 17 is in a released state with respect to the hollow brake drum 15.

When stopping the rotation of the inner tank 14, the solenoid 22 is de-energized, and the actuating lever 16, which is rotatably supported by the actuating lever shaft 24, is biased by the brake spring 25 in the direction opposite to the arrow direction in FIG. The band 17 is pressed against the hollow brake drum 15, and the hollow brake drum 15 stops. At this time, frictional heat is generated between the brake band 17 and the hollow brake drum 15. A lower shaft 26 having a concentric sun gear formed on the upper part thereof is fitted into the drum bearing 19 via a bearing.
A step is formed in the middle of the dewatering driven pulley 20 by a washer 27 attached to the step.
is supported. A collar 28 having a flange at its lower end and whose upper end abuts the washer 27 is fitted onto the lower shaft 26 , and a laundry driven pulley 29 connects the flange of the collar 28 and the lower shaft 26 .
It is clamped and fixed between a nut that is screwed into the threaded part at the lower end. The washing driven pulley 29 is V
It is connected via a belt to a washing drive pulley 18, which is integrated with a cooling fan and which is externally fitted and fixed to the output shaft of a washing motor 8.

On the other hand, the upper outer circumferential surface of an internal gear 30 having a gear formed on the inner circumferential side is tightly attached to the upper step of the inner circumferential surface of the hollow brake drum 15. The lower side of the abutting surface with the hollow bull rake drum 15 has a smaller diameter than the abutting surface, and the flange 30A is attached to the upper part as a whole.
It is formed into a substantially cylindrical surface. As described above, since the small-diameter portion of the body of the hollow brake drum 15 and the large-diameter portion of the internal gear 30 fit together, the inner circumferential surface of the hollow brake drum 15 and the outer circumferential surface of the internal gear 30 A space is formed between the brake band 17 and the hollow brake drum 15 over an equivalent length in the axial direction, and the heat generated between the brake band 17 and the hollow brake drum 15 when the rotation of the inner tank 14 is stopped is insulated by the space. be done. Further, a recessed portion is formed at the lower end of the internal gear 30 to engage with a protrusion protruding from the drum receiver 19, and the internal gear 30 is fixed to the drum receiver 19 by engagement with the protrusion and the recessed portion. has been done. The planetary gear 31 that meshes with the internal gear 30 is attached to a support 32
and is supported by a support frame 33 so as to be able to rotate automatically and revolve. The support body 32 is externally fitted onto the lower end of the serrated cross section of the washing shaft 34 which is fitted into the cylindrical shaft 12 via a bearing. A rotary blade 35 is externally fitted and fixed to the upper end of the washing shaft 34.

When the laundry electric motor 8 rotates, a planet formed by the laundry driven pulley 29, the lower shaft 26, a sun gear, an internal gear 30, a planetary gear 31, a support frame 33, and a support body 32 formed on the lower shaft is generated. A rotary blade 35 is rotated via a gear reduction device and a washing shaft 34.

Effects of the Invention As explained above, according to the present invention, a flange is provided protruding from the upper outer circumferential surface of the internal gear, and this flange is brought into contact with the inner circumferential surface of the hollow brake drum. The heat generated between the brake band and the hollow brake drum that occurs when stopping the rotation of the tank can be insulated by the space formed between the inner peripheral surface of the hollow brake drum and the outer peripheral surface of the internal gear. Since it is possible to prevent thermal deterioration of resin gears and also to prevent thermal deterioration of lubricating oil, quality can be stabilized, and moreover, it is possible to use inexpensive resin materials with low heat resistance for gears. I can do it.

[Brief explanation of drawings]

Fig. 1 is a longitudinal cross-sectional view of a single-tub washing machine according to an embodiment of the present invention, Fig. 2 is a longitudinal cross-sectional view of the braking device and deceleration device portion of the single-tub washing machine, and Fig. 3 is a longitudinal cross-sectional view of a single-tub washing machine. FIG. 3 is a partially cutaway plan view of the bearing case portion and operating lever of the machine. 5... Outer tank, 9... Bearing cover, 10... Bearing case, 12... Cylindrical shaft, 14... Inner tank, 15
...Hollow brake drum, 17...Brake band,
19...Drum holder, 30...Internal gear, 30A...
...Brim portion, 31...Planetary gear, 34...Washing shaft, 3
5...Rotary wing.

Claims (1)

[Claims] 1. A cylindrical shaft surrounded by an outer tank and having an inner tank serving as a washing and dehydrating tank concentrically fixed to the upper end thereof and having a rotary blade at the center of the bottom surface; a washing shaft having the rotary blade fixed to the upper end; a bearing case and a bearing cover located below the outer tank and supporting the cylindrical shaft and the washing shaft; a hollow brake drum housed in the bearing case and the bearing cover and connected to the cylindrical shaft; It is composed of a drum receiver, a brake band having one end fixed to the bearing case and the other end being pivotally supported by the operating lever and wound around the hollow brake drum, an internal gear, a planetary gear, and a sun gear. The hollow brake drum and a planetary gear reduction device housed in a drum holder are provided, a flange is provided protruding from the upper outer peripheral surface of the internal gear, and this flange is attached to the inner peripheral surface of the side wall of the hollow brake drum. A space is formed between the outer circumferential surface of the internal gear other than the flange and the inner circumferential surface of the side wall of the hollow brake drum, and a brake band is wound around the outer circumferential surface of the hollow brake drum that faces the space. Speed reduction device for tub type washing machines.