JPH11221396A - Spin dryer shaft for washing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the warp of a shaft center and to improve rotation accuracy by connecting a first steel pipe member for attaching a washing and spin dryer drum and a second steel pipe member freely turnably supported by two bearings so as to connect them in an axial direction. SOLUTION: This spin dryer shaft 40 is constituted of the two steel pipe members of a basket connection shaft 41 and a drive source connection shaft 42, and for the basket connection shaft 41, a plane part is provided on an outer peripheral cylinder part, a connection part with a flange 15 attached to a basket 2 is formed and the flange 15 is fixed with a nut 53 by working a screw at a tip. The outer peripheral tip part of the drive source connection shaft 42 is forcibly fitted to the lower end inner peripheral part of the basket connection shaft 41. The dehydration shaft 40 is rotatably support by the bearings 51 and 52 at the two parts of the top part and lower part of the drive source connection shaft 42. Thus, machining is reduced and coaxial accuracy is improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dehydrating shaft suitable for a fully automatic washing machine and the like.

[0002]

2. Description of the Related Art A dehydrating shaft used in a fully automatic washing machine is a hollow shaft as shown in FIG. 3, one end of which is connected to a basket, and the other end of which is provided with a driving force such as a motor by a driving source such as a motor. −
They are connected via an OFF mechanism.

Since the basket connecting portion of the dewatering shaft is a submerged portion, a material having high corrosion resistance is required. However, there is no problem with general steel materials except for the submerged portion which occupies most of the dewatering shaft.

[0004] From this, the dehydrating shaft used in the washing machine,
In consideration of material costs, workability, and the like, for example, the structure is such that a stainless steel pipe and a structural carbon steel pipe are combined.

[0005] As the joining means, there is press joining such as butt welding or press fitting. In the press-fitting method, there is known a press-fitting method in which a basket connecting shaft is press-fitted into an inner diameter portion of a drive source connecting shaft.

[0006] Further, the dehydrating shaft is rotatably supported by two bearings with the connecting portion interposed therebetween.

[0007]

However, the press-fitting type has the following problems.

[0008] The basket connecting shaft is required to have a strength capable of withstanding the moment due to the centrifugal force during dewatering, so that a hollow shaft having an appropriate outer diameter is required.

The drive source connecting shaft has a hollow shaft larger in diameter than the basket connecting shaft because the basket connecting shaft is press-fitted into the inner diameter of the driving source connecting shaft, thereby increasing the size of the entire driving mechanism.

Regarding the supporting position of the bearing,
Because the joint of the shaft is located in the middle of the two bearings,
Particularly in butt welding and the like, it is difficult to ensure coaxial accuracy, which is not preferable for vibration, noise, life, and the like.

An object of the present invention is to eliminate the above-mentioned disadvantages,
An object of the present invention is to provide a compact and inexpensive dehydrating shaft for a washing machine, which can easily ensure coaxial accuracy.

[0012]

SUMMARY OF THE INVENTION The present invention relates to a dehydrating shaft for a washing machine having a hollow dehydrating shaft rotatably supported by two bearings spaced apart and having a washing and dehydrating tub attached to one end thereof. The hollow dewatering shaft is characterized in that a first steel pipe member to which a washing and dewatering tub is attached and a second steel pipe member rotatably supported by two bearings are connected so as to be connected in the axial direction. is there.

The drive source connecting shaft, which is the first steel pipe member supported by the two bearings, is formed of a single steel pipe member without a connecting portion, so that the shaft center is not deviated and the rotation accuracy is high. It is.

Further, since the outer periphery of the drive source connecting shaft which is the first steel tube member is fitted to the inner peripheral portion of the basket connecting shaft 41 which is the second steel tube member, the outer periphery of the drive source connecting shaft is provided. Small diameter and small bearing circumference.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a basic structure of a fully automatic washing machine. Reference numeral 1 denotes an outer frame made of a substantially box-shaped steel plate including an internal mechanism, and reference numeral 2 denotes a stainless steel basket having a bottom. It has a substantially cylindrical shape, and a large number of dehydration holes 2a
And a hollow annular upper balancer 3 in which fluid is sealed in the upper and lower portions, and a rotatable stirring blade 5 is disposed in the center of the lower portion.

Reference numeral 6 denotes a substantially cylindrical outer tub having a bottom which rotatably encloses the basket 2 and receives washing water. A drive unit is mounted on the bottom via a center base 8 made of steel plate. Is provided with a concave spherical suspension rod receiver 6a for holding the vibration isolator 9, and the entire outer tank is transferred from the concave spherical corner plate 1a fixed to the upper four corners of the outer frame 1 to the vibration isolator 9. Supports drooping vibration isolation.

A synthetic resin tub cover 7 is fixed to the upper end opening to prevent the laundry from dropping into the gap between the outer tub 6 and the basket 2.

The anti-vibration device 9 includes a suspension rod 9a, an anti-vibration spring 9b,
It comprises a sliding cylinder 9c, a spring receiver 9d, a hanging rod holder 9e, and the like.

A suspending rod holder 9e having a convex spherical surface is fixed to the upper end of the suspending rod 9a, and the retainer 9e fits into the concave spherical surface of the corner plate 10.

The sliding cylinder 9c has a convex spherical surface which fits into the concave spherical surface of the hanging rod receiver 6a, and has therein an anti-vibration spring 9b and a spring receiver 9d. 9b expands and contracts, and the spring receiver 9d vibrates while rubbing the inner surface of the sliding cylinder 9c.

The driving unit includes a motor 10, a clutch 11, a V-belt 12, and the like. The rotation of the motor 10 is transmitted to the clutch 1 via a motor pulley 13, a V-belt 12, and a P-pulley 14.
Transmit to 1.

The clutch 11 has a clutch spring mechanism and the like for switching between washing and spin-drying, and has a washing shaft 11a and a spin-dry shaft 40.

The stirring blade 5 is fixed to the washing shaft 11a, and the basket 2 is fixed to the dehydrating shaft 40 via the flange 15. When washing, the rotating force is transmitted to the stirring blade 5 via the washing shaft 11a. At the same time, at the time of dehydration, the clutch spring mechanism is operated to transmit the rotational force to the dehydrating shaft 40, and the basket 2 is rotated to perform dehydration.

The drainage device comprises a drainage valve 16 and a drainage hose 17. One end of the drainage valve 16 is bonded to a drainage port 6 b provided at the bottom of the outer tub 6, and the other end is provided with a drainage hose 17.
And the other end of the drain hose 17 is drawn out of the machine from a drain hose outlet 18.

The water level is detected by a water level sensor 20 via an air tube 19 from an air trap 6c provided in the outer tub 6.

Reference numeral 21 denotes a water supply solenoid valve, one end of which is connected to a faucet via a water supply hose, and the other end of which is a water inlet 22.
It is connected to the.

Reference numeral 23 denotes an upper surface cover having a panel box portion, in which a control unit 24 as a control unit, a water level sensor 20 for controlling a water level, a power switch 25, an input switch unit 26, a progress display unit 27 and the like are provided. Is stored.

The panel box section 28 is provided at two places on the front side and the rear side, and has a front panel 29 and a back panel 30 mounted thereon, respectively.

The upper cover 23 is provided with an opening 23a for putting in clothing and a lid 31 for opening and closing the opening 23a, and is configured to cover the upper opening of the outer frame 1.

The above is the overall configuration.

Next, the dewatering shaft 40 of the present invention will be described in detail with reference to FIG.

The dewatering shaft 40 is composed of first and second two steel pipe members. The first member is a basket connecting shaft 41, and the second member is a drive source connecting shaft 42.

The basket connecting shaft 41 is provided with a flat portion on the outer peripheral cylindrical portion, forms a connecting portion with the flange 15 attached to the basket 2, and has a threaded end and a nut 53.
Thus, the flange 15 is fixed.

A water seal 5 is provided on the outer periphery of the other end.
0 is attached, and the outer tank 6 is sealed with water.

Since the portion of the water seal 50 located in the outer tub 6 is a flooded portion, the basket connecting shaft 41
Uses stainless steel tubing.

The drive source connecting shaft 42 is a steel pipe made of structural carbon steel, and the washing shaft 11a penetrates inside.

The outer peripheral tip of the drive source connecting shaft 42 is press-fitted to the inner peripheral portion of the lower end of the basket connecting shaft 41,
It is press-fitted by a press or the like.

The dewatering shaft 40 is configured to be rotatably supported by bearings 51 and 52 at two locations, that is, the uppermost portion and the lower portion of the drive source connecting shaft 42.

With the above configuration, the following effects can be obtained.

The drive source connecting shaft 42 is connected to the basket connecting shaft 4.
Since it is press-fitted into the inner diameter part 1, a portion occupying most of the dewatering shaft 40 can be made of a general steel material having a small diameter, and the entire drive mechanism can be made compact and the material cost can be reduced.

In addition, since the bearing support is provided only on the drive source connecting shaft 42, a dewatering shaft with less co-machining and high coaxial accuracy can be obtained.

The drive source connecting shaft 42 as the second steel pipe member
Are ball bearings 5 arranged vertically apart
1,52. Since the two bearings 51 and 52 support the same drive source connecting shaft 42, they have the same size.

The outer periphery of the drive source connecting shaft 42 as the second steel pipe member is connected to the basket connecting shaft 41 as the first steel pipe member.
Are connected so as to be fitted to the inner peripheral portion of the. This connection includes press fitting, shrink fitting, screwing, welding, caulking, and others.

The coupling in which the outer peripheral portion of the drive source coupling shaft 42 fits into the inner peripheral portion of the basket coupling shaft 41 is the basket coupling shaft 4.
Since the outer diameter of the drive source connecting shaft 42 is smaller than that of the coupling in which the inner peripheral portion of the drive source connecting shaft 42 is fitted to the outer peripheral portion of the drive shaft 1, the two bearings 51 and 52 are small. The bearing circumference becomes smaller.

The drive source connecting shaft 42, which is rotatably supported by the two bearings 51 and 52, is formed of a single steel pipe member without a connecting portion, so that there is no deviation in the axial center and the rotational accuracy is high. High rotation axis.

The drive source connecting shaft 42 has two bearings 51, 5
2 is machined to finish the outer peripheral surface to be fitted to improve dimensional accuracy.

The lower end surface of the basket connecting shaft 41 with which the upper surface of the inner peripheral ring of the bearing 51 abuts is machine-finished to improve dimensional accuracy.

The large-diameter outer peripheral portion of the basket connecting shaft 41 with which the water seal 50 is slidably contacted is machine-finished to improve dimensional accuracy.

The flange 15 of the basket 2 (washing and dewatering tub) is fitted into the small diameter portion of the basket connecting shaft 41. The outer circumference of the small diameter part is machined up to improve dimensional accuracy,
The fitting accuracy of the flange 15 is improved.

Since the basket connecting shaft 41 shown in FIGS. 1 and 2 is longer in the axial direction than the basket connecting shaft 41 shown in FIG. 3, an expensive stainless steel material can be saved.

[0052]

As described above, the present invention relates to a dehydrating shaft of a washing machine having a hollow dehydrating shaft rotatably supported by two spaced bearings and having a washing and dehydrating tub attached to one end. Wherein the hollow dewatering shaft is connected to the first steel pipe member to which the washing and dewatering tub is attached and the second steel pipe member rotatably supported by two bearings so as to be connected in the axial direction. There is a dehydration shaft on the machine.

According to this configuration, since the second steel pipe member in which the two bearings are rotatably supported is formed of a single steel pipe member having no connecting joint, there is no deviation in the axial center and the rotation accuracy is high. It is good.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a washing machine according to one embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of the washing machine according to one embodiment of the present invention.

FIG. 3 is an enlarged view of a main part showing a conventional example.

[Explanation of symbols]

Reference numeral 40 denotes a dehydrating shaft, 41 denotes a basket connecting shaft, and 42 denotes a driving source connecting shaft.

Claims (3)

[Claims] 1. A dewatering shaft of a washing machine having a hollow dewatering shaft rotatably supported by two spaced apart bearings and having a washing and dewatering tub attached to one end thereof, wherein the hollow dewatering shaft comprises a washing and dewatering shaft. A dehydrating shaft for a washing machine, wherein a first steel pipe member to which a water tub is attached and a second steel pipe member rotatably supported by two bearings are connected in an axial direction. 2. The steel pipe member according to claim 1, wherein the first and second steel pipe members are joined so that the outer circumference of the second steel pipe member fits into the inner circumference of the first steel pipe member. And a washing machine with a dehydrating shaft. 3. The dehydrating shaft of a washing machine according to claim 1, further comprising a washing shaft for driving a stirring blade inside the hollow dewatering shaft.