JP2000074188A - Washing machine and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a surplus positioning process and a special device, and join a rotor with a boss firmly by fixing a polygon boss or a boss having a plurality of protrusions on an outer periphery to the inside of a fitting part which is circularly recessed in the vicinity of a center of a rotor main body by means of squeeze or press-in work. SOLUTION: In a rotor 1, one metal thin plate is molded having a belt groove with a plurality of molding process, and a fitting part 3 of a boss 2 is formed on a center part. The fitting part 3 is formed in a circular shape. The boss 2 is formed in an octagonal shape with a metal plate having wall thickness, in a shape provided with eight protrusions on a circular outer peripheral part at equal spaces, or in a shape excepting one protrusion from the eight protrusions on the circular outer peripheral part. The boss 2 is pressed in the fitting part 3 of the rotor 1, or is firmly joined by squeezing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating body and a method for manufacturing the same, and further relates to a washing machine using the rotating body.

[0002]

2. Description of the Related Art Conventionally, as a method of assembling a boss or the like for reinforcement to a rotating body formed of a thin plate, as shown in FIG. Then, they were aligned, assembled, and press-fitted.

In FIG. 7A, reference numeral 3 denotes a rotating body 1
7B, the boss 2 having a shape as shown in FIG. 7B is press-fitted into the mating portion 3 at the rotating body mating portion (hereinafter, referred to as a "mating portion"). Was something.

[0004] The fitting portion 3 and the boss 2 have been formed into an oval shape for obtaining a strong connection.

[0005]

Generally, when a boss is press-fitted into a rotating body to obtain a strong connection, a large interference is required if the shape of the mating portion between the rotating body and the boss is made to be a perfect circle. As a result, the joining portion (thin portion) of the thin metal plate forming the rotating body is elongated, so that a desired torque cannot be obtained. For this reason, as shown in FIG. 7, the shape of the mating portion has been changed to a different shape (for example, an oval shape). However, when the rotating body and the boss are assembled in order to make the shape different, the alignment is required. Extra steps and special equipment are required, which not only reduces the productivity, but also necessitates an extra investment for automation and the like. Further, in the case of a rotating body having a high-precision alignment portion such as a clutch hole, an even higher-precision device and management were required.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotating body in which a rotating body and a boss are firmly connected without requiring an extra positioning step and a special device, a method of manufacturing the same, and a washing method using the rotating body. To provide machines.

[0007]

The object of the present invention is to provide (1) a rotating body composed of a metal plate, and a boss fixed near the center of the rotating body and formed of a metal plate thicker than the rotating body. In the rotating body, a circular concave portion is formed in the vicinity of the center of the rotary body, and a boss having a polygon or a plurality of protrusions on the outer periphery is fixed in the fitted portion by drawing or press-fitting. Is solved by

(2) In (1), the problem is solved by that one surface side of the boss is fixed by a retaining portion formed on at least a part of the fitting portion.

(3): In (2), it is possible to solve the problem by forming the retaining portion by drawing the fitting portion in a diameter reducing direction.

(4): A predetermined number of pressing steps for forming a rotary body having a circularly concave fitting part near the center from a metal flat plate, and a polygon or an outer periphery in the fitting part after the pressing step A boss having a plurality of projections is housed in the housing, and a squeezing process is performed from outside the mating portion to fix the boss to the mating portion.

(5): In (4), the squeezing process is solved by including a step of forming a retaining portion by squeezing the mating portion near the one surface side of the boss in the diameter reducing direction. .

(6): In (4), it is possible to solve the problem by performing a hole forming step of simultaneously forming holes required for the boss and the rotating body after the drawing step.

(7): A predetermined number of pressing steps for forming a rotary body having a circular concave portion near the center from a flat metal plate, and after the pressing step, a polygon or an outer periphery is formed in the coupling portion. A press-fitting step of press-fitting a boss having a plurality of projections into the fitting portion and fixing the boss to the fitting portion.

(8) In (7), the press-fitting process includes a drawing step of forming a retaining portion by narrowing a fitting portion near one surface side of the boss in a diameter reducing direction. The problem is solved by a manufacturing method of a rotating body that performs the following.

(9) A method of manufacturing a rotating body according to (4), wherein, after the press-fitting step, a hole forming step of simultaneously forming holes required in the boss and the rotating body is performed. Is solved by

(10): In a washing machine in which the power of a motor for a washing machine is transmitted to a pulley via a belt, and a spinning shaft fixed to the pulley drives a dewatering tub or a rotating blade, the pulley is made of a metal plate. A pulley main body, and a boss thicker than the pulley main body and fixed to the rotating shaft. Further, a circular concave fitting portion is formed near the center of the pulley main body, and a polygonal or outer periphery is formed in the fitting portion. A boss having a plurality of projections fixed thereto by drawing or press-fitting.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. In FIG. 1, reference numeral 1 denotes a rotating body having a belt groove 4 formed by forming a single sheet of metal through a plurality of forming steps, and a mating portion 3 of a boss 2 is formed at a central portion. The boss 2 is formed of a thick metal plate.
As can be seen from the drawing, the mating portion 3 of the rotating body 1 is formed in a circular shape, and the boss 2 is formed in a regular octagon. 3 shows the specific shape of the boss 2, FIG. 3 (a) is a boss having a regular octagonal shape, and FIG. 3 (b) is a shape in which eight protrusions are provided at regular intervals on a circular outer peripheral portion. 3 (c) is the boss of FIG.
FIG. 3B shows an example of a boss having a shape excluding one protrusion from FIG. Then, as shown in FIG. 3D, the boss 2 is set on the mating portion 3 and is firmly connected.

Here, the outermost diameter of the mating portion 3 of the boss 2 is determined by press-fitting the outer diameter of the mating portion of the rotating body with the diameter of the mating portion of the rotating body or by narrowing the outer diameter of the mating portion of the rotating body (including squeezing). In the range where a strong bond can be obtained by acting to reduce the In addition, apart from the example of FIG. 3, the shape of the boss 2 and the shape of the mating portion 3 of the rotating body 1 may also be circular, and the diameter reduction operation may be realized by an internal gear-shaped tool or may be combined. .
The shape of the boss 2 has a polygon or a protrusion as described above,
In addition, the shape of the engagement portion 3 of the rotating body 1 needs to be substantially circular so that the engagement margin is substantially constant.
In addition, the arrangement of the protrusions is preferably an equal arrangement, but is not necessarily equal, and may be any arrangement as long as the axis after the rotating body 1 and the boss 2 are combined is coincident.

4 and 5 show an embodiment of the fitting method. FIG. 4 shows an embodiment in which the boss 2 is press-fitted into the rotating body 1, and FIG. 5 shows an embodiment in which drawing is performed thereafter. is there. In FIG. 4, reference numeral 8 denotes a punch having a pilot 7 so that the boss 2 can be set at a correct position. The punch 8 is mounted on a lower base 9, and the lower base 9 is mounted on a pressure generating device (not shown) and moved. It is configured to be possible. The rotating body 1 is also set on the punch 8 so that the axis thereof matches the boss 2 set on the punch 8. The press-fitting tool 25 is attached to the upper base 10, and concentricity between the punch 8 and the press-fitting tool 25 is maintained by a guide post or the like (not shown). The upper base 10 is attached to a press-fitting device (not shown). FIG. 4 shows a state where the press-fitting of the rotating body 1 and the boss 2 is completed. Then, in the method of joining the rotating body 1 and the boss 2, first, the press-fitting tool 25 is lifted and stopped, and the rotating body 1 is set on the boss 2 placed on the punch 8. Next, the press-fitting tool 25 is lowered and stopped at the position shown in FIG.
Press-fitting is completed. Next, the press-fitting tool 25 is raised to take out the rotating body 1 combined with the boss 2 to complete one cycle. FIG. 4 does not show a projection device for taking out the rotating body 1. In addition, the diameter of the fitting portion 3 of the rotating body 1 is set to be slightly larger than the outer diameter of the boss 2, and the fitting portion of the rotating body is drawn by using the boss 2 as a part of the punch 8. Also provides a strong bonding force.

Next, another embodiment will be described with reference to FIG. In FIG. 5, a punch 11 having a pilot 7 for correctly positioning the boss 2 is incorporated in a lower base 12, and is attached to a press-fitting device (not shown) such as a press. The pressurizing upper piece 15 is fixed to the upper stand 21 so as to be positioned and movable by the lower stand 12 and a guide post (not shown), and is attached to the press-fitting device. A caulking piece 13 having a caulking narrowing portion 30 is arranged around the pressurizing upper piece 15, and the caulking piece 13 is spread by a retainer 16 or the like so that the caulking piece 13 spreads to a maximum inner diameter substantially equal to the outer diameter of the mating portion of the rotating body 1. Limited. Further, the retainer 16 is configured such that when the upper base 21 is lowered, the tapered portion 31 of the caulking piece 13 is pushed by the tapered portion 31 of the plate 17 so that the inner diameter of the narrowing portion 30 of the caulking piece 13 is reduced. Also,
The caulking piece 13 is divided into several pieces by the roller 14 in the circumferential direction so as to be able to perform the above-described expansion and contraction operation. However, even if the piece is not divided in the circumferential direction, it is sufficient if the above-described operation can be performed like a collet chuck. Things. The stopper 18 limits the processing position of the plate 17 and determines the narrowing amount of the swaging piece 13. Then, the left side from the center of FIG. 5 shows that the mating is completed and the upper stand is raised, and the right side shows the bottom dead center where the mating is completed.

In the above, the method for connecting the rotating body 1 and the boss 2 is as follows. First, the upper base 21 is stopped at the raised position, and the boss 2 and the rotating body 1 are set on the punch 11. Next, when the upper base 21 is lowered, the caulking piece 13 and the pressure upper piece 15 cooperate to draw the mating portion of the rotating body and incorporate the boss 2 into the rotating body 1. Here, when the inner diameter of the fitting portion 3 is set to be larger than the outer diameter of the boss 2, drawing is performed, and when the inner diameter of the fitting portion 3 is set smaller than the outer diameter of the boss 2, press-fitting is performed. is there. Next, near the bottom dead center, the swaging piece 13 is moved inward in the lateral direction by the action of the tapered portion 31 of the plate 17, and the outside of the fitting portion 3 of the rotating body 1 is further reduced in diameter by the narrowing portion 30.

The rotating body 1 after the completion of the engagement raises the upper base 21 and is taken out by the repelling device.

According to such a manufacturing method, since the rotating body 1 and the boss 2 are integrated after fitting, there is no need to position each time, and high precision can be obtained at low cost. Furthermore, in a transfer press or a progressive press working in which a rotating body is machined in a progressive manner, the above-described mating process can be easily and rationally incorporated into the process. High quality and low cost rotating body assembly work becomes possible.

FIG. 6 is an enlarged view of a mating portion between the rotating body 1 and the boss 2. The mating portion of the rotating body 1 is pushed outward by the apex of the mating portion of the boss, and shrinks inward at a portion of the rotating body 1 not in contact with the apex of the boss 2 so as to reduce the gap. Due to this deformation, an internal stress is generated at the engagement portion of the rotating body, and a strong engagement force is generated. Further, by processing the narrowed portion in the mating portion, a higher bonding strength can be obtained, and a stronger torque can be generated than in the conventional circular boss.

Next, an embodiment in which the above-mentioned rotating body 1 is used as a pulley for transmitting the power of a motor of a washing machine will be described.

FIG. 8 shows only the lower part of the outer tub 24 of the washing machine. The washing machine transmits the power of the motor 23 to the V-shaped belt 22, and the V-shaped belt 22 transmits the power to the pulley 1 which is a rotating body. The torque transmitted to the pulley 1 is transmitted to a shaft 26 for transmitting power to a rotor (not shown). The lower part of the shaft 26 passes through the center of the pulley 1 and is fixed with a nut 27. By doing so, the rotational force of the pulley 1 is transmitted through the boss 2 to the shaft 26.
Can be told. When the outer tub 24 of the washing machine is rotated to perform dehydration, the clutch hole 6
To transmit the driving force of the motor to a dehydration tank (not shown).

As described above, since the power of the motor 23 is transmitted to the pulley 1 via the V-shaped belt 22 and further transmitted to the shaft 26 via the boss 2, the pulley 1 is always pulled by the belt 22 toward the motor 23. It is the shape that was given. Therefore, the boss 2 applies an axial force in addition to the circumferential torque. If the boss 2 and the pulley 1 are weakly connected, they may be separated from each other. On the other hand, since the boss 2 is firmly connected to the pulley 1 so as not to move in the axial direction by the drawn portion 28 of the pulley 1 near the lower portion of the boss 2, the pulley 1 reliably supplies power to the shaft 26 and the clutch 21. Can be communicated.

Next, the process of forming the pulley and the boss of the washing machine will be described with reference to FIG.

FIG. 9A is a thin steel plate, which is a raw material for press-forming a pulley. FIG. 9B shows FIG.
The steel plate of (a) is drawn and the pulley is substantially formed. FIG. 9C is a view showing a state in which a thick boss 2 previously formed into a regular octagon is pressed into the pulley 1. FIG. 9 (d) shows the lower portion 28 of the boss 2 of the pulley 1
3 is drawn. Here, FIG.
9C and 9D are performed by the apparatus shown in FIG. Finally, FIG. 9 (e) shows a state where the boss 2 and the pulley 1 are assembled and the two
Is formed.

By the above-described pressing process, a pulley can be made from one steel plate, the pulley and the boss can be integrated without being aligned, and the hole for the clutch can be easily formed. Can be done.

[0031]

According to the present invention, the connection between the rotating body (pulley) used in the washing machine and the boss can be strengthened.

[Brief description of the drawings]

FIG. 1 is a sectional view of a center of a rotating body assembly.

FIG. 2 is a plan view of a rotating body assembly.

FIG. 3 shows a rotating body and a boss of the embodiment.

FIG. 4 is a press-fit type of a rotating body and a boss.

FIG. 5 shows a squeezing type of a rotating body and a boss.

FIG. 6 is a detailed explanation of a mating portion of the present invention.

FIG. 7 shows a conventional rotating body and boss.

FIG. 8 shows a rotating body and a boss for transmitting the power of the motor of the washing machine.

FIG. 9 shows details of a pressing step.

[Explanation of symbols]

1 ... rotating body, 2 ... boss, 3 ... mating part of rotating body and boss,
4 ... V-shaped belt groove, 5 ... shaft hole, 6 ... clutch hole, 7 ... pilot, 8 ... punch, 9 ... lower stand, 10 ... upper stand, 13 ...
Caulking piece, 14 roller, 15 pressure upper piece, 16 retainer, 17 plate, 18 stripper, 19 spring, 20 stripper bolt, 21 clutch, 22
... V-shaped belt, 23 ... Motor, 24 ... Outer tub of washing machine, 2
5 ... press-fitting tool, 26 ... shaft, 27 ... fastener, 28 ...
Caulking part, 30 ... narrowing part, 40 ... gap between rotating body and boss.

Continuation of the front page (72) Inventor Daishin Adachi 1-1-1, Higashitaga-cho, Hitachi City, Ibaraki Prefecture F-term (reference) 3B155 AA10 BB05 BB19 CA06 CB07 CB32 HB02 HB03 HB14 HB26 MA01 MA02 3J031 BA09 BC03 BC10 CA02

Claims (10)

[Claims] A rotator having a rotator main body made of a metal plate and a boss fixed to a center of the rotator main body and made of a metal plate thicker than the rotator main body. To form a mating part concaved in a circular shape
A rotating body, wherein a boss having a polygon or a plurality of protrusions on the outer periphery is fixed by drawing or press-fitting in the fitting portion. 2. The rotating body according to claim 1, wherein one side of the boss is fixed by a retaining portion formed on at least a part of the fitting portion. 3. The rotating body according to claim 2, wherein the retaining portion is formed by drawing the mating portion in a diameter reducing direction. 4. A predetermined number of pressing steps for forming a rotary body having a circularly concave fitting portion near the center from a metal flat plate, and after the pressing step, a plurality of polygons or a plurality of outer peripheral portions are formed in the fitting portion. And a squeezing step of fixing the boss to the mating portion by storing a boss having the projection and performing a squeezing process from outside the mating portion. 5. The rotating body according to claim 4, wherein said squeezing process includes a step of forming a retaining portion by squeezing a mating portion near one surface side of said boss in a diameter reducing direction. Manufacturing method. 6. A method for manufacturing a rotating body according to claim 4, wherein a hole forming step for simultaneously forming holes required in said boss and said rotating body is performed after said drawing step. 7. A predetermined number of pressing steps for forming a rotating body having a circularly concave fitting portion near the center from a metal flat plate, and after the pressing step, a plurality of polygons or a plurality of outer peripheral portions are formed in the fitting portion. A press-fitting step of press-fitting the boss having the projection and fixing the boss to the mating portion. 8. The rotation according to claim 7, wherein the press-fitting process includes a drawing step of forming a retaining portion by squeezing a mating portion near one surface side of the boss in a diameter reducing direction. How to make the body. 9. The method for manufacturing a rotating body according to claim 4, wherein a hole forming step for simultaneously forming holes required for said boss and said rotating body is performed after said press-fitting step. 10. A washing machine in which the power of a motor for a washing machine is transmitted to a pulley via a belt, and a dehydration tub or a rotating blade is driven by a rotating shaft fixed to the pulley, wherein the pulley is made of a metal plate. A main body, a boss thicker than the pulley main body and fixed to the rotating shaft, further forming a circular concave fitting portion in the vicinity of the center of the pulley main body, and a polygon or a plurality of outer peripheral portions in the fitting portion; A boss having a projection is fixed by drawing or press-fitting.