JPH0361464B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a single-tank household electric washing machine.

Conventional structure and its problems Ball bearings are generally used for the shaft bearings that support the dewatering and washing tub of conventional household single-tub washing machines. Since the ball bearings are used in various environmental conditions, such as outdoors or in bathrooms, a protective cover is provided as a separate part and filled with grease, etc. to prevent water droplets and dust from condensation on the component parts from having an adverse effect on the ball bearings. I was dealing with it, but
There were problems such as an increase in the number of parts and an increase in the number of structural steps needed to install the parts.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and an object of the present invention is to provide a one-tub type washing machine in which the ball bearing can be made dustproof and waterproof without attaching any separate parts.

Structure of the Invention In order to achieve the above object, the single-tank washing machine of the present invention has an inner tub as a washing and dewatering tub surrounded by an outer tub and having rotary blades at the center of the bottom, which is concentrically fixed at the upper end. a cylindrical shaft, a washing shaft having the rotary blade fixed to the upper end thereof, a bearing case and a bearing cover located below the outer tub and supporting the cylindrical shaft and the washing shaft, and these bearings. A brake drum and a drum bearing are housed in a case and a bearing cover and are connected to the cylindrical shaft, and a ball bearing is housed in the bearing case and the bearing cover, and the ball bearing arrangement is provided on the bottom surface of the bearing case. An annular groove having a plurality of small holes is formed in the vicinity of the groove, and the bottom surface of the bearing case and the brake drum are arranged close to each other.

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 pivoted on the top plate 2, and 4 is the anti-vibration A hanging tool 5 having a built-in spring is an outer tank suspended and supported by the outer box 1 by a hanging tool 4, and a substrate 6 is fixed to the outside of the bottom of the outer tank 5. This board 6 has
A dewatering electric motor 7 and a washing electric motor 8 are fixed, and a bearing cover 9 and a bearing case 10, which house a braking device and a deceleration device inside, are fixed concentrically with the outer tub 5. The bearing cover 9
A ball 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 the brake drum 15. A brake band 17 is wound around the body of the brake drum 15. The brake band 17 has one end fixed to the bearing case 10, the other end pivotally supported by the operating lever 16, and a brake liner fixed to the inside. On the bottom surface of the bearing case 10, an annular groove 36 having a plurality of small holes 36a is formed in the vicinity of the installation part of the ball bearing 11 and at a position inside the outer diameter of the contact part of the brake band 17 of the brake drum 15. It is formed. The distance A between the bottom surface of the bearing case 10 and the brake drum 15 is set to about 2 mm to prevent dust from entering. A stepped portion is formed on the upper outer circumferential surface of the body of the brake drum 15 and is smaller in diameter than the contact surface of the brake band 17,
This stepped portion is similarly formed on the inner circumferential surface. Further, a drum receiver 1 is provided at the bottom of the brake drum 15.
The drum bearing 19 has a plurality of protrusions protruding from its upper surface, and the lower part of the drum bearing 19 has a bearing 11 at the lower end.
The lower side thereof has a serration shape in cross section. 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.

When the electric motor 7 dedicated to dewatering rotates, the inner tank 14 is rotated via the dewatering driven pulley 20, the drum receiver 19, the brake drum 15, and the cylindrical shaft 12. At this time, the actuating lever 16 is attracted in the direction of the arrow in FIG. 3 via the actuating metal fitting 23 due to the energization of the solenoid 22, and the brake band 17 is in a released state with respect to the 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 brake drum 15, and the brake drum 15 stops. At this time, frictional heat is generated between the brake band 17 and the brake drum 15. A lower shaft 26 having a concentric sun gear formed on the upper part thereof is fitted into the drum receiver 19 via a bearing, and a step is formed in the middle of the lower shaft 26. The dewatering driven pulley 20 is supported by a washer 27 mounted thereon. A collar 28 having a flange at the lower end and abutting the washer 27 at the upper end is fitted onto the lower shaft 26, and a laundry driven pulley 29 connects the flange of the collar 28 and the lower end of the lower shaft 26. It is clamped and fixed between a nut that is screwed into the threaded part of. The laundry driven pulley 29 is connected via a V-belt to a laundry driving pulley 18 that is integrated with a cooling fan and is externally fitted and fixed to the output shaft of the laundry electric motor 8.

On the other hand, an internal gear 30 having a gear formed on the inner circumferential side is provided at an upper step on the inner circumferential surface of the brake drum 15.
The upper outer circumferential surface of the internal gear 30 is tightly attached, and the outer circumferential surface of the internal gear 30 is formed into a cylindrical surface with a diameter smaller than the contact surface below the contact surface with the brake drum 15. There is. As described above, since the small diameter portion of the body of the brake drum 15 and the large diameter portion of the internal gear 30 are fitted, the brake drum 1
A space is formed between the inner circumferential surface of No. 5 and the outer circumferential surface of the internal gear 30 over an equivalent length in the axial direction, so that when the rotation of the inner tank 14 is stopped, the brake band 17 and the brake Heat generated between the drum 15 and the drum 15 is insulated by the space. 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. Planetary gear 3 meshing with internal gear 30
1 is supported by a support body 32 and a support frame 33 so as to be able to rotate and revolve. The support body 32 is
The washing shaft 34 is fitted into the cylindrical shaft 12 via a bearing, and is fitted onto the lower end of the serrated cross-section of the washing shaft 34. A rotary blade 35 is attached to the upper end of the washing shaft 34.
is fixed on the outside.

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, an annular groove portion having a plurality of small holes is formed near the ball bearing installation portion on the bottom surface of the bearing case, and the bottom surface of the bearing case and the brake drum are arranged close to each other. This prevents condensed water droplets and dust from entering the ball bearing, and it is possible to obtain the same performance as before without using a separate protective cover, reducing manufacturing costs by reducing the number of component parts and assembly man-hours. This can be reduced.

[Brief explanation of drawings]

Fig. 1 is a vertical 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, 11... Ball bearing, 12... Cylindrical shaft, 1
4... Inner tank, 15... Brake drum, 19...
Drum holder, 34...Washing shaft, 35...Rotary blade, 3
6...Groove, 36a...Small hole.

Claims (1)

[Claims] 1. A cylindrical shaft surrounded by an outer tank and having an inner tank as a washing and dehydrating tank having a rotary blade at the center of the bottom and concentrically fixed to the upper end, and a washing shaft to which the rotor blade is 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; and a brake drum housed in the bearing case and the bearing cover and connected to the cylindrical shaft. and a drum bearing, and a ball bearing housed in the bearing case and the bearing cover; an annular groove having a plurality of small holes is formed near the ball bearing installation portion on the bottom surface of the bearing case; A single-tank washing machine in which the bottom of the case and the brake drum are placed close to each other.