JPH0361465B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a braking 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 band is made to come in contact with this part, and a deceleration device is installed inside the brake drum to decelerate the rotation of the electric motor using a pulley, and then the rotation is further decelerated by the deceleration device. It is transmitted to the wings. The speed reduction device has a gear configuration including an internal gear, a planetary gear, and a sun gear, and the outer circumferential surface of the internal gear and the inner circumferential surface of the brake drum are in close contact with each other. . Furthermore, since the inner circumferential surface of the brake drum and the outer circumferential surface of the internal gear require centering precision with respect to the cylindrical shaft, the inner circumferential surface of the brake drum has been cut. In addition, during dehydration operation, the cylindrical shaft connected to the brake drum and the washing/dehydrating tank rotate at approximately 1000 rpm, and when the rotation of the washing/dehydrating tank is stopped, the brake band, one end of which is fixed to the bearing case, is used as a brake. The rotation of the washing and dewatering tank is stopped by pressing it against the drum. However, in such a configuration, frictional heat is generated between the brake band and the brake drum during braking, and the planetary gear reduction device made of resin is subject to thermal deterioration of the resin gears and gear lubricating oil. There was a problem with the negative impact.

Purpose of the Invention The present invention solves the above-mentioned conventional drawbacks, and the heat generated in the brake band when the inner tank is stopped from steady rotation causes a thermal adverse effect on the resin planetary gear reduction device disposed on the brake drum. To provide a braking device for a single-tub type washing machine that can prevent the damage from occurring and at the same time reduce the cutting portion of the inner circumferential surface of the brake drum.

Composition of the Invention In order to achieve the above object, a braking device for a single-tub washing machine according to the present invention has an inner tub as a washing and dehydrating tub surrounded by an outer tub and having rotary blades at the center of the bottom, which is concentrically arranged at the upper end. a cylindrical shaft fixed to the washing 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 and supporting 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; one end fixed to the bearing case and the other end pivotally supported by the actuating lever; The brake band of the brake drum includes a brake band wound around a drum, and a planetary gear reduction device comprised of an internal gear, a planetary gear, and a sun gear and housed in the brake drum and a drum receiver. A small diameter portion having a small diameter on both the inner and outer circumferential surfaces is formed above the contact portion with the internal gear, and the inner circumferential surface of the small diameter portion is brought into contact with the outer circumferential surface of the internal gear, thereby tightening the brake band of the brake drum. A space is formed between the inner circumferential surface of the contact portion and the outer circumferential surface of the internal gear.

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 an outer box of a single-tub washing machine, 2 is a lid that is pivoted on a top plate 2 attached to the top of the outer box 1, and 4 is a suspension with a built-in anti-vibration spring. Reference numeral 5 denotes an outer tank that is 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. A dewatering electric motor 7 and a washing electric motor 8 are fixed to the substrate 6, 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 tank 5. ing. A bearing 11 is fixed to the bearing cover 9 and 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. The hollow body of the brake drum 15 has one end fixed to the bearing case 10 and the other end fixed to the operating lever 16.
A brake band 17 is wound around the brake band 17, which is pivotally supported by the brake belt and has a brake liner fixed to the inner side thereof. A stepped portion is formed directly or via an R portion on the upper outer circumferential surface of the body of the brake drum 15 and has a smaller diameter than the contact surface of the brake band 17, and this stepped portion is formed on the inner circumference. It is also formed on the surface. With such a shape, workability during manufacture of the brake drum 15 will be improved. In addition, the brake drum 1
A drum receiver 19 is fixed to the lower part of the drum receiver 19, and the drum receiver 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 side has a serration shape in cross section. formed into a 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.

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.

To stop the rotation of the inner tank 14, when the solenoid 22 is de-energized, the actuating lever 16 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 that of the contact surface with the brake drum 15 on the lower side. 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 41 is formed between the inner circumferential surface of the internal gear 5 and the outer circumferential surface of the internal gear 30 over an equivalent length in the axial direction. Heat generated between the brake drum 15 and the brake drum 15 is insulated by the space 41. Further, the internal gear 3
A recess is formed at the lower end of the drum support 19 to engage with a protrusion protruding from the drum support 19. By engaging these projections and the recess, the internal gear 30 is moved into the drum support 19.
is fixed. The planetary gear 31 that meshes with the internal gear 30 is supported by a support body 32 and a support frame 33 so as to be able to rotate and revolve. The support body 3
2 is externally fitted onto the lower end of the serrated cross section of the washing shaft 34 which is fitted inside 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, above the part of the brake drum that contacts the brake band,
By forming a small diameter portion that has a small diameter on both the inner and outer circumferential surfaces, and bringing the inner circumferential surface of this small diameter portion into contact with the outer circumferential surface of the internal gear,
Heat generated between the brake band and the brake drum when the rotation of the inner tank is stopped is prevented from thermal deterioration of the resin gear and lubricating oil by the insulation effect of the space between the inner peripheral surface of the brake drum and the outer peripheral surface of the internal gear. can be prevented,
Therefore, quality can be stabilized, and an inexpensive resin material with low heat resistance can be used as the gear of the speed reduction device. Furthermore, since the inner circumferential surface of the hollow brake drum has a space on the inner circumferential side of the brake band contact area, machining accuracy is not a concern, and therefore only the small diameter portion of the inner circumferential surface of the brake drum needs to be cut. Compared to cutting the entire inner peripheral surface, the machining time is shorter, productivity can be improved, and manufacturing costs 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, 12... Cylindrical shaft, 14... Inner tank, 15
... Brake drum, 17 ... Brake band, 19
...Drum support, 30...Internal gear, 31...Planetary gear, 32...Support, 33...Support frame, 34...
...washing shaft, 35...rotor blade, 41...space.

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 that are located below the outer tank and support the cylindrical shaft and the washing shaft; Consisting of a brake drum, a drum bearing, a brake band wound around the brake drum with one end fixed to the bearing case and the other end pivotally supported by the operating lever, an internal gear, a planetary gear, and a sun gear. and a planetary gear reduction device housed in the brake drum and the drum receiver, and a small diameter portion having a small diameter on both the inner and outer circumferential surfaces is provided above the portion of the brake drum that contacts the brake band. and the inner circumferential surface of the small diameter portion is brought into contact with the outer circumferential surface of the internal gear to form a space between the inner circumferential surface of the brake band contacting portion of the brake drum and the outer circumferential surface of the internal gear. Braking device for tub-type washing machines.