JPH049080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bearing sealing device for a dehydrating shaft of a dehydrating washing machine.

(Conventional configuration and its problems) The dehydration shaft of a conventional dehydrating washing machine has a stainless steel shaft press-fitted into the central boss of the brake wheel, and during dehydration operation, it is housed in the tank. Due to the unbalance of the clothes, a large bending moment is applied to the dehydration shaft, and concentrated stress is applied to the press-fitted part of the dehydration shaft, resulting in problems such as loosening of the press-fitted part. FIG. 1 shows a conventional example. In the figure, 1 is a dewatering shaft, and a flange 2 for holding a tank is inserted and fixed at the tip of the dehydrating shaft 1. A brake wheel 3 is disposed at the lower end of the dehydration shaft 1, and the dehydration shaft 1 is press-fitted into the center of the brake wheel 3. A bearing device 4 and a seal device 5 are mounted on the outer periphery of the dewatering shaft 1. In the conventional configuration, since the outer circumference of the dehydration shaft 1 is sealed, the water accumulated in the washing liquid receiving tank 6 comes into contact with the dehydration shaft 1, so the material is SUS.
It was necessary to use rust-proof steel such as Also, insert the flange 2 into the tip of the dewatering shaft 1, and tighten the mounting nut 7.
However, since the top of the spindle shaft is open, it is exposed to the washing liquid. Therefore, antirust treatment was necessary. In addition, the press-fitting part of the dehydration shaft requires high cutting accuracy such as machining the outer diameter of the shaft and machining the inner diameter of the central part of the brake wheel, which increases the cost due to the number of machining steps and quality confirmation during press-fitting.

(Object of the Invention) The object of the present invention is to eliminate the conventional drawbacks, to integrally form the dehydrating shaft and the brake wheel, to eliminate unstable elements in the joint, and to create a structure in which the dehydrating shaft is not exposed to washing liquid. The purpose is to improve durability and allow the dehydration shaft to be made of a material comparable to ordinary iron.

(Structure of the Invention) The dehydrating washing machine of the present invention includes a dehydrating and washing tank (hereinafter referred to as a tank), a washing liquid receiving tank that accommodates the tank, a flange that holds the tank below, and a washing liquid that is inserted and fixed to the flange. a dehydration shaft that rotatably supports the tank, and a bearing device that rotatably supports the dehydration shaft is fixed to the washing liquid receiving tank;
The lower end of the dewatering shaft is integrally formed into a cylindrical portion with a large diameter, a brake device is disposed on the outer periphery of the cylinder, and a drive switching device is disposed inside.

Further, a sealing member is inserted into the outer periphery of the dehydration shaft insertion boss portion of the flange, and this serves as a sealing device between the bottom of the washing tub, and a lower open recess that covers the upper and outer portions of the sealing member is attached to the flange. This makes the dehydration shaft watertight.

(Description of Embodiment) An embodiment of the present invention will be described based on FIGS. 2 and 3.

In the figure, reference numeral 11 denotes a main body, and a washing liquid receiving tank 13 containing a tank 12 is disposed inside the main body 11. The washing liquid receiving tank 13 is supported by a lower support rod 14 supported on the upper surface of the main body 11. 15 is elastically supported via a suspension 16.

A pulsator 17 is disposed at the center of the bottom of the tank 12 to agitate the laundry and perform a cleaning action. 18 is fixed to the bottom back surface of the tank 12,
A dewatering shaft 20 that rotatably supports the tank 12 is inserted and fixed to the central boss portion 19 of the flange 18, which is a flange held below. 21 is the dehydration shaft 20
In addition, a nut that tightens and secures the central boss portion 19 of the flange 18 is tightened to the threaded portion 22 of the dewatering shaft 20. A retaining ring 23 is attached to the dewatering shaft 20 and serves as a stopper for holding the lower end of the flange 18. A bearing device 24 rotatably supports the dewatering shaft 20, and is fixed to the washing liquid receiving tank 13 via a reinforcing plate 26 fixed to the housing 25 and the bottom of the washing liquid receiving tank 13. 27 is a brake wheel, and a brake shoe 2 is installed on its outer circumference.
8 is attached to form a braking device when the tank 12 is rotated for dewatering. A drive switching device 29 is housed inside the brake wheel 27 and decelerates the rotation transmitted from the washing and dehydrating driving motor 30 via the output shaft 31 or switches the driving direction (washing and dehydrating). . In the present invention, the dewatering shaft 20 and the brake wheel 27 are integrally formed and processed by cold forging. Reference numeral 32 denotes a sealing member for sealing the dehydration shaft part, and the seal lip part is attached to the dehydration shaft insertion central boss part 19 of the flange 18.
It is in sliding contact with the outer periphery of a seal cap 33 fitted on the outer periphery of the seal cap 33. The upper end of the seal cap 33 is an inverted U.
It is bent into a shape to form an air trap 33a, which encloses the tip 34 of the upper seal lip. 35 is an O-ring that seals between the central boss portion 19 of the flange 18 and the seal cap 33. The outer circumferential fitting portion 32a of the seal member 32 is
It is press-fitted in a watertight manner into a cylindrical recess 13a formed at the center of the bottom of the washing liquid receiving tank 13.

Reference numeral 36 denotes a cylindrical sleeve fitted around the outer periphery of the tightening nut 21 of the flange 18, the upper end of which is slightly bent outward and has an edge, and the large diameter hole 19a of the hole of the central boss portion 19 of the flange 18. It is inserted tightly into the 37 connects the upper surface of the central boss portion 19 of the flange 18 and the nut 2 around the bent edge of the sleeve 36.
With the packing held between the bottom surface of the periphery of 1,
It controls the function of providing watertightness and airtightness between the nut 21 and the hole 19a of the central boss portion 19.

38 is a sealing member for the support shaft 39 of the pulsator 17, and is fitted into the central hole of the nut 21.

When the laundry put in the tank 12 is rotated at high speed and dehydrated, a large unbalance occurs due to the unevenness of the laundry, but this unbalance causes a large bending moment to be applied to the dehydrating shaft 20, and the dehydrating shaft 20 Excessive stress is applied to the base (bending portion) of the brake wheel 27. However, since the shaft portion and the brake wheel portion are integrally formed, stable holding strength can be obtained.

In addition, the sealing function of the dehydration shaft 20 is performed on the outer periphery of the seal cap 33 without directly sliding the seal lip part on the dehydration shaft 20 as in the conventional case. There is no need for polishing or anti-corrosion treatment, and the cost of processing the shaft is significantly reduced.

With the above configuration, the central boss portion 1 of the flange 18
9 and the bearing device 24 can be disposed adjacent to each other, the length of the dewatering shaft 20 can be shortened accordingly, the bending moment can be reduced accordingly, and the overall configuration can be made more compact.

(Effects of the Invention) According to the present invention, the dehydration shaft and the brake wheel can be forged integrally using a metal material with relatively good workability, and the seal portion can be forged without using expensive SUS material for anti-corrosion treatment. Since quench hardening treatment is not required, the processing process is simplified, which has a significant effect on cost reduction.

Furthermore, since a sealing device is disposed on the outer periphery of the dehydration shaft insertion boss portion of the flange, the dehydration shaft can be shortened, the bending moment can be reduced, and there is no need to perform any special processing on the surface of the dehydration shaft.

Further, since the large-diameter cylinder is integrally formed at the lower end of the dewatering shaft, and the brake device is disposed around the outer periphery of the large-diameter cylinder, it is possible to obtain stable holding strength.

[Brief explanation of drawings]

Figure 1 shows the bearing structure of a conventional washing machine and
FIG. 2 is a basic structural diagram of a dehydrating washing machine, and FIG. 3 is a detailed sectional view of a dehydrating bearing device and a sealing device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Dewatering shaft, 2... Flange, 3... Brake wheel, 4... Bearing device, 5... Seal device, 6, 13... Washing liquid receiver tank, 7... Mounting nut, 11... Main body, 12 ... Tank, 14 ... Support rod, 15 ... Lower support, 16 ... Suspension, 17 ... Pulsator, 18 ... Flange,
19...Central boss section, 20...Dehydration shaft, 21...
Nut, 22...Threaded part, 23...Retaining ring, 24...
... Bearing device, 25 ... Housing, 26 ... Reinforcement plate, 27 ... Brake wheel, 28 ... Brake shoe, 29 ... Drive switching device, 30 ... Drive motor, 31 ... Output shaft, 32, 38 ... Seal member, 32a ... Fitting part, 33 ... Seal cap, 33a ... Air trap, 34 ... Tip of seal lip part, 35 ... O-ring, 36 ...
...Sleeve, 37...Packing, 39...Support shaft.

Claims (1)

[Scope of Claims] 1. A tank consisting of a dehydration/washing tub, a washing liquid receiving tank housing the tank, a flange that holds the tank below, and a tank that is inserted and fixed into the flange to rotationally support the tank. A bearing device that rotatably supports the dehydration shaft is fixed to the washing liquid receiving tank, and a sealing member is inserted into the outer periphery of the dehydration shaft insertion boss portion of the flange, so that the washing liquid is A lower open recess is formed in the flange to cover the upper and outer parts of the sealing member, and a large-diameter cylindrical part is integrally formed at the lower end of the dewatering shaft. A dehydrating washing machine characterized in that a brake device is disposed on the outer periphery of a large diameter cylinder, and a drive switching device is disposed inside.