JPH064880Y2 - Dehydration washing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a one-tank type dewatering washing machine for performing washing and dewatering in the same tank, and more particularly to improvement of a device for preventing dewatering axis reversal in its mechanical portion. It is a thing.

2. Description of the Related Art Conventionally, as shown in FIG. 4, this type of dewatering washing machine has a washing and dewatering tub 2 provided inside a water tub 1 for storing water at the time of washing, and a pulsator 3 for agitating clothes at a central inner bottom and a side wall. There are many small holes for draining water. The bearing box 5 located below the water tank 1 has a mechanism for transmitting the driving force of the motor 6 so as to rotate only the pulsator 3 during washing and rotate the washing / dehydrating tank 2 during dehydration. Further, the motor 6 transmits the driving force to the bearing housing 5 by the belt 7 and the pulley 8.

Reference numeral 9 is a drain valve of the water tank 1, 10 is a brake arm, 11 is a solenoid for pulling the drain valve 9 and the brake arm 10, 12 is a support plate, on which the water tank 1, the motor 6, the bearing box 5, etc. are arranged, and the rod. It is supported by 13 from the corners of the outer frame 14. 15 is a balancer provided at the upper part of the washing / dehydrating tank, and 16 is a drain hose.

In the bearing box 5, a washing shaft for rotating and supporting the pulsator 3 or a rotating mechanism such as a dehydrating shaft for performing the dehydration rotation of the washing / dehydrating tub 2, bearings thereof, and switching of washing / dehydrating operation are performed. A clutch mechanism, a brake mechanism for preventing the washing / dehydrating tub from rotating during washing, and a dehydration brake mechanism for stopping during washing are provided.

As shown in FIG. 5, the bearing box portion is a washing and dehydrating tank 2
A dehydrating shaft 18 fixed to a flange 17 fixed to the outer bottom of the pulsator 3 is coaxially supported inside to support the rotating washing shaft 19 of the pulsator 3. Bearing box 5 below the dehydration shaft 18
The interior 12 is press-fitted and fixed to the dehydration shaft 18, and a brake drum 21 in which a gear reduction device 20 for reducing the washing rotation speed from the rotation of the motor 6 to an appropriate rotation speed is provided. A gear case 22 containing the device 20 is internally provided. Below the gear case 21, a dehydration drive shaft 24 in which a washing drive shaft 23 is rotatably provided is formed.

The dehydration tub 18, the brake drum 21, the gear case 22 and the dehydration drive shaft 24 described above are also a dehydration shaft system for performing the dehydration rotation of the washing / dehydration tub 2 while having the washing rotation transmission mechanism inside, and are provided in the bearing box 5. The upper bearing 26 housed in the upper bearing box 25 and the lower bearing 2 housed in the lower bearing box 27.
It is rotatably supported at 8.

A brake band 30 having a brake shoe 29 fixed to the inner surface is removably wound around the outer periphery of the brake drum 21. One end of the brake band 30 is fixed to the lower bearing box 27, and the other end is pivotally supported by a pin 31 attached to the tip of the brake arm 10. The brake arm 10 is rotatably supported by a shaft 32 inserted in the lower bearing box 27. The brake band 30 is attached to and detached from the brake drum 21 by the rotation of the brake arm 10. The brake arm 10 is biased by a spring 33 or the like in a predetermined direction so that the brake band 30 comes into close contact with the brake drum 21.

The lower end of the bearing box 5 is provided with a clutch mechanism 34 that rotates the washing drive shaft 23 during washing and rotates the dehydration drive shaft 24 during dehydration.

The brake band 30 has a strong braking force in the winding direction of the brake band 30, and can be used as a braking force when the washing / dehydrating tub 2 rotates in one direction. On the other hand, when washing, the pulsator 3 generally rotates in the forward and reverse directions.
The clothes inside which are rotated as the pulsator 3 rotates generate contact force in the washing / dehydrating tub 2 due to contact friction.
This turning power is transmitted through the dehydration shaft 18 to the brake drum 2
1 is transmitted. In this case, as described above, the brake band 3
In the case of the rotation of 0 in the winding direction, a strong braking force is obtained, and therefore the rotation of the washing / dehydrating tub 2 is small, but in the direction of loosening the brake band 30, that is, in the anti-dewatering rotation direction,
The washing / dehydrating tub 2 is rotated. When this rotation occurs, the relative rotational force between the clothes and the washing / dehydrating tub 2 is reduced, and the cleaning force is reduced.

In order to solve this problem, a coil spring 36, which can be loosened in the dehydration direction, is wound around the outer periphery of the cylindrical portion 35 above the brake drum 21, which is the connecting portion to the dehydration shaft 18. One end of the coil spring 36 is locked to the shaft 32 described above. The action of this spring clutch causes the dehydration shaft 1 when the pulsator 3 rotates in the anti-dehydration rotation direction.
The rotation of the washing machine 8 and the washing / dehydrating tub 2 is reduced, and the reduction of the washing power can be prevented.

However, in the conventional configuration, the cylindrical portion 3 of the brake drum 21
Since 5 and the coil spring 36, which is a spring clutch, are in frictional contact with each other, torque loss is extremely large when the spin-drying shaft 18 rotates, and accordingly, heat generation due to friction is also large. Further, grease was applied to the sliding portion in frictional contact to reduce friction, but this also melted due to heat generation and the like and was unstable in performance.

In view of the above problems, it is an object of the present invention to provide a dewatering washing machine having a highly reliable rotation preventing mechanism.

Means for Solving the Problems In order to achieve the above-mentioned object, the dewatering washing machine of the present invention is a washing and dewatering tub with a pulsator rotatably arranged at the bottom, and dewatering and rotating the washing and dewatering tub in one direction. A washing shaft located coaxially inward of the dehydration shaft for rotating the pulsator, a speed reducer connected to the dehydration shaft for reducing the rotation speed, and an inward direction of the speed reducer for rotating the dehydration shaft. A bearing box having a bearing portion that supports it and a clutch housing having a lock clutch that allows the dehydration shaft to rotate in one direction are provided, and the clutch housing is a bearing that is allowed to float in the axial direction and the radial direction of the dehydration shaft. It is a structure supported by a box.

With this configuration, the roller clutch can be used as a rotation preventing means, so that the roller clutch and the dehydration shaft are in rolling contact with each other, the axial torque loss at the time of dehydration is small, and the heat is generated. Very few,
The reliability can be increased. Further, when the pulsator is rotated in the forward and reverse directions to generate a turning force in the washing / dehydrating tub, since the turning force is received through the roller clutch, the clutch housing, and the buffer sleeve, the force received by the roller clutch can be buffered, and the long term The quality of the roller clutch can be secured.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. In the figure, the cylindrical portion 35 at the upper part of the brake drum 21
A clutch housing 42 is provided on the outer side. The clutch housing 42 is attached to the burring hole 25a of the flat surface portion of the upper bearing box 25 with a stepped bolt 51 via a buffer sleeve 50 made of resin. The inner diameter of the burring hole 25a and the buffer sleeve 5
The outer diameter gap of 0 is about 0.5 to 1 mm, and the fitting of the inner diameter of the buffer sleeve 50 and the outer diameter of the stepped bolt 51 is
It is in a loose fit state or a press fit state. Buffer sleeve 5
The distance A from the lower surface of the collar portion of 0 to the mounting surface of the clutch housing 42 is the burring height B of the burring hole 25a.
It is about 1 to 2 mm larger than the above, and due to such a dimensional relationship, the clutch housing 42 has an axial direction of 0.5 mm.
It has a degree of freedom of about 1 mm and about 1 to 2 mm in the radial direction. Reference numeral 43 denotes a roller clutch press-fitted into the clutch housing 42, in which a plurality of ratchet grooves 47 are continuously formed on the inner peripheral surface as shown in FIG.
A cylindrical roller 48 is rotatably mounted in each ratchet groove 47 to have the same shape as the bearing. Each roller 48 is circumscribed on the outer peripheral surface of the cylindrical portion 35 of the brake drum 21. Further, grease is applied to the inside of the roller clutch 43 in order to prevent noise due to rotation and rust prevention.

In the above configuration, the dehydration drive shaft 24, the gear case 22, the brake drum 21, and the dehydration shaft 1 are arranged in the dehydration rotation direction during dehydration.
When 8 rotates, as shown in FIG. 3A, each roller 48 of the roller clutch 43 is released from the constraint from the ratchet groove 47 and can freely rotate. Further, the clothes rotated with the rotation of the pulsator 3 at the time of washing generate a rotational force in the washing / dehydrating tub 2 due to contact friction, and the washing / dehydrating tub 2 rotates in the direction in which the brake band 30 is loosened, that is, in the anti-dewatering rotation direction. When trying to do so, as shown in FIG. 3 (b), the roller 48 of the roller clutch 43 is caught in the ratchet groove 47, and the dewatering shaft 18 and the washing / dehydrating tub 2 connected to the cylindrical portion 35 of the brake drum 21. Does not rotate, and it is possible to prevent the cleaning power from decreasing.

Further, the height of the annular rib 44 of the partition member 46 provided above the brake band 30 is set to the clutch housing 4
2 and the lower end of the roller clutch 43 are extended upward by L dimension to prevent scattering of grease or the like.

Effects of the Invention As is apparent from the above-described embodiments, the present invention provides a clutch housing with a degree of freedom in both the axial direction and the radial direction, and a roller clutch in the clutch housing, so that the dehydration shaft can be positioned at the time of dehydration. It is possible to reduce the torque loss of the shaft and heat generation due to the contact, so that a reliable and efficient clutch mechanism can be realized. Furthermore, since the clutch housing has degrees of freedom in each direction, it is not necessary to align the spin-drying shaft with the core when installing, and even if the spin-drying shaft flexes slightly due to the load, the degree of freedom follows. Therefore, accuracy is not required for assembly and deformation of the dehydration shaft, and assemblability can be improved. Also, when the pulsator is rotated in the forward and reverse directions to generate a turning force in the washing and dehydrating tub, this turning force is received through the roller clutch, the clutch housing, and the buffer sleeve.
The force received by the roller clutch can be buffered, and the quality of the roller clutch can be secured for a long period of time. Particularly in the case of a washing machine, since the number of times the pulsator is rotated in the forward and reverse directions is large, the above-mentioned configuration has a remarkable effect.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a rotation mechanism portion showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view of the main portion thereof, and FIG. 3 is a roller for preventing anti-dewatering rotation of a washing / dehydrating tank of the present invention. The clutch operating state is shown in (a), which is a sectional view of the roller clutch showing the operating state when the brake drum directly connected to the spin-drying shaft rotates to the right (spin-drying rotation), and (b) shows the spin-drying shaft. A sectional view of a roller clutch showing an operating state when the directly connected brake drum rotates counterclockwise (anti-dewatering rotation), FIG. 4 is a sectional view of a conventional dewatering washing machine, and FIG. 5 is a conventional rotating mechanism section. FIG. 21 ... Brake drum, 25a ... Burring hole, 3
5 ... Cylindrical part, 40 ... Groove part, 42 ... Clutch housing, 43 ... Roller clutch, 44 ... Annular rib, 4
5 ... Lip part, 46 ... Partition member, 50 ... Buffer sleeve, 51 ... Stepped bolt.

Claims (1)

[Scope of utility model registration request] 1. A washing / dehydrating tank in which a pulsator is rotatably arranged at the bottom, and when the washing / dehydrating tank is rotated in one direction for dewatering, the pulsator is positioned inwardly on the same axis as the dewatering shaft. A washing shaft that rotates, a speed reducer that is connected to the washing shaft to reduce the number of rotations, a bearing box that has a bearing portion that supports the spin-drying shaft inside the speed reducer, and the spin-drying rotating direction of the spin-drying shaft. And a clutch housing having a roller clutch that is rotatable only, wherein the clutch housing is
At least one or more holes are provided in the upper part of the bearing box, and are supported by stepped bolts through a buffer sleeve that penetrates the holes and has a gap that allows free play in the axial and radial directions. A dehydration washing machine that can be moved in the radial direction.