JPS62217997A - Speed reducer of washing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a speed reduction device for a washing machine, and more particularly to a bearing support structure.

2. Description of the Related Art A conventional single-tub centrifugal dehydrating washing machine had a structure as shown in FIG. That is, 1 is an outer tank for receiving washing water, and 2 is a washing and dehydrating tank provided inside the outer tank 1. A pulsator 3 is provided at the bottom and a large number of small holes 4 for draining water are provided in the side wall.

Reference numeral 5 denotes a mechanical case, which has a mechanism for transmitting the driving force of the motor 6 so as to rotate only the pulsator 3 during washing and the washing and dewatering tub 2 during dehydration. Also, motor 6
The driving force is transmitted to the mechanical case 5 by a belt 7 and a pulley 8. 9 is a drain valve of the outer tank 1, 1o is a brake arm, 11 is a solenoid that pulls the drain valve 9 and the brake arm 1o, 12 is a support plate on which the outer tank 1, motor θ, mechanical case 6, etc. are arranged, and a rod 13 It is suspended on the exterior body 14. 16 is a balancer provided at the top of the washing and dehydrating tank, 16 is a drain hose, and 17 is an opening/closing lid on the top surface.

Next, FIG. 3 shows the detailed configuration of the conventional mechanical case 6.

Referring to FIG. 4, reference numeral 18 denotes a dewatering rotary shaft unit, and 19 denotes a lower mechanical case that supports the dehydrating rotary shaft unit 18 with a lower bearing 2o. Further, the lower bearing 2o is press-fitted and fixed to the lower mechanical case 19 and the dewatering rotary shaft unit 18. 2
1 is a gear that reduces the speed of the washing pulsator 3 in the dewatering rotary shaft unit 18; 22 is a clutch spring that allows the dehydrating rotary shaft unit 18 to rotate only in the clockwise direction;
23 is an upper mechanical case to which a seal backing 24 and an upper bearing 25 are fixed. Reference numeral 26 denotes a fixed stopper of the washing/dehydration tank 2, which is detachable. Also, the fourth
As shown in the figure, the upper mechanical case 23 is designed to finally close the lower mechanical case 19 from above during the assembly process, and the inner ring 26' of the upper bearing 26 and the dewatering rotary shaft unit 18 are inserted in the loose state. The gap is about ~18μ.

Problems to be Solved by the Invention In such a conventional configuration, when performing dewatering, the dewatering rotating shaft unit 18 and the inner ring 25 of the upper bearing 26
′, there may be variations in the gap or a slight fall of the dewatering rotation shaft unit 18
Due to the flatness of the mounting surface of the upper mechanical case 23, etc., the rotational phase, that is, the rotation speed of the upper bearing inner ring 26' is lower than the rotation of the dehydration rotary shaft unit 18. Over time, a creep phenomenon occurs in which the dewatering rotating shaft unit portion, which has a low quenched hardness, wears out, causing problems such as abnormal noises being generated during dewatering and dehydration vibrations increasing.

The present invention is intended to solve these problems, and aims to eliminate the creep phenomenon caused by phase and slippage by synchronizing the rotational speeds of the dehydration rotary shaft unit and the inner ring of the upper bearing.

Means for Solving the Problem In order to solve this problem, the speed reduction device for a washing machine of the present invention has a tapered recess whose diameter increases downward in the joint part of the dehydration rotating shaft that plays with the inner ring of the upper bearing. It has a structure in which a groove is provided and an O-ring is compressed and inserted into the groove.

Effect: With this configuration, the dewatering rotary shaft and the upper bearing inner ring are frictionally connected by the O-ring and rotate as one unit. As a result, no phase occurs during dehydration rotation, and the cause of the creep phenomenon is eliminated.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIG. In the figure, 27 is the dehydration rotating shaft unit 18
A tapered surface 27' whose diameter increases downward with a concave groove provided in
have. 28 is an O-ring placed in the groove. When the upper bearing 25 is inserted from above the dehydration rotating shaft unit 18 with the following configuration,
The upper bearing inner ring 25' contacts the O-ring 28 and moves downward. At this time, as shown in Fig. 1C, the O-ring is pushed from above by the bearing inner ring 26', moves downward, hits the tapered surface 27' of the groove 27, and becomes significantly deformed, and at the same time, the dehydration rotating shaft This results in a strong compression connection of the bearing inner ring 26'. Also, when removing the upper mechanical case 23 upward,
The O-ring moves upward and returns to its original small-diameter groove (the state shown in Figure 1), and can be easily removed as before.

Effects of the Invention As described above, according to the present invention, the dewatering rotary shaft is inserted into the upper bearing in an uncoupled state for the assembly process or for service considerations, and the uncoupling portion of the dehydrating rotary shaft has a large downward diameter. Since a concave groove is provided and an O-ring is compressed and inserted into this concave groove, it is possible to prevent the occurrence of a creep phenomenon due to the phase. In addition, the concave grooves can be easily formed using conventional cutting processes, and the major problem of creep phenomenon can be solved with relatively simple improvements.

Furthermore, the insertion of the upper mechanical case remains the same as before, and the work required to remove it for service, repair, etc. is the same as before, improving performance and preventing deterioration of workability. be.

[Brief explanation of drawings]

Figure 1a is an exploded cross-sectional view of the dehydrating rotary shaft and upper bearing of the embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of the one-tub centrifugal dehydrating washing machine, FIG. 3 is a longitudinal sectional view of the mechanical case unit, and FIG. 4 is an exploded sectional view of the upper mechanical case and the dehydrating rotating shaft. 18... Dehydration rotating shaft unit, 19...
...Lower mechanical case, 20...Lower bearing, 23...Upper mechanical case, 25...
...Upper bearing, 26'...Upper bearing inner ring, 27...Concave groove, 28...0 ring. Name of agent Patent attorney Toshio Nakao and 1 other person (1
)) ” Figure 2

Claims (1)

[Claims] A dewatering rotary shaft unit having a built-in gear that reduces the number of revolutions of a pulsator during washing, upper and lower mechanical cases housing the dehydrating rotary shaft unit, and a lower bearing fixed to the lower mechanical case and pivotally supporting the dehydrating rotary shaft unit. , is provided with an upper bearing fixed to an upper mechanical case and into which a dehydrating rotating shaft is inserted in an loose state, and a tapered concave groove whose diameter increases downward is provided in the upper loose fitting part of the dehydrating rotating shaft, and the groove is A washing machine speed reduction device in which an O-ring is arranged and the O-ring is compressed and interposed between the inner ring of the upper bearing.