KR20040105027A - Pulley of motor for washing machine and manufacturing method thereof - Google Patents

Abstract

PURPOSE: A motor pulley of a washing machine and a manufacturing method thereof are provided to cut down the manufacturing cost by forming the first member and the second member with pressing, assembling the first and second members and bending or injection-molding the cooling blade. CONSTITUTION: A motor pulley(10) of a washing machine is composed of a first member(11) and a second member(12) formed by pressing the metal sheet and contacted to each other in the center and composed of belt grooves for fitting the belt; plural assembling projections(15a,15b) extended and expanded to penetrate the first member and the second member and to assemble the center of the first member with the center of the second member; and plural cooling blades(18) integrally formed in the outer periphery of the first member.

Description

Motor pulley for washing machine and manufacturing method thereof {PULLEY OF MOTOR FOR WASHING MACHINE AND MANUFACTURING METHOD THEREOF}

The present invention relates to a motor pulley for a washing machine, and more particularly, to a motor pulley for a washing machine and a method for manufacturing the same, so that the motor pulley can be easily manufactured.

A general washing machine includes a motor for generating rotational power, and a power transmission device including a clutch mechanism, a braking device, and the like, for performing power conversion to selectively transmit power of the motor to a pulsator and a dehydration tank. The motor and the power train are connected via pulleys and belts for power transmission.

In such a washing machine, a pulley for a motor is fixed to a shaft of a motor, and the outer circumferential portion thereof has a structure in which a groove for hanging an annular rope or a belt is formed along a circumference thereof. In addition, the pulley of the washing machine motor is integrally provided with a plurality of cooling wings extending to the outside of the motor to perform cooling of the motor when the pulley rotates.

Conventionally, when making a motor pulley for a washing machine, after forming the shape of the pulley through aluminum die casting or casting, etc., after removing the debris on the surface of the molding and precisely cutting the inner surface of the groove part, the processing is performed. Prepared in the manner.

However, the conventional motor pulley manufactured in this manner is complicated in the manufacturing process, such as having to go through a difficult post-processing process after molding, and has a high cost burden due to the high cost because it uses a base material such as aluminum.

The present invention is to solve the above problems, an object of the present invention is to provide a motor pulley for a washing machine and a method for manufacturing the same that can be easily manufactured at a low cost.

1 is a cross-sectional view showing the configuration of a washing machine to which the present invention is applied.

2 is a cross-sectional view showing the configuration of a motor pulley for a washing machine according to the first embodiment of the present invention.

3 is a plan view showing a first member configuration of the motor pulley for a washing machine according to the first embodiment of the present invention.

Figure 4 shows step by step the manufacturing process of the motor pulley for a washing machine according to the first embodiment of the present invention.

5 is a cross-sectional view showing the configuration of a motor pulley for a washing machine according to a second embodiment of the present invention.

Figure 6 shows step by step the manufacturing process of the washing machine motor pulley according to the second embodiment of the present invention.

FIG. 7 is a detailed view of portion A of FIG. 5.

Explanation of symbols on the main parts of the drawings

10,100: motor pulley, 11,110: first member,

111: binding ball, 112: binding protrusion,

12,120: second member, 14,140: shaft coupling hole,

15a, 15b, 150a, 150b: engaging projection, 16a, 16b, 160a, 160b: engaging hole,

18,180: cooling wing.

To achieve this purpose, the motor pulley for a washing machine according to the present invention is formed through press molding of a metal plate, and the first and second members are spaced apart from each other so that the center part is closely coupled to each other and the outer peripheral part is formed with a belt groove for fastening the belt. ; A plurality of coupling protrusions extending from one of the two members and penetrating from the other of the two members so that the central portions of the first and second members may be coupled to each other; And a plurality of cooling vanes integrally provided with the first member on an outer circumferential portion of the first member.

In addition, a shaft coupling hole is formed in the center of the first member and the second member so that the shaft of the motor can be coupled, and the shaft coupling hole has an inner circumference such that the shaft can be coupled to the shaft of the motor in a restricted rotational state. It is characterized in that the locking portion is formed in a straight portion.

In addition, the motor pulley for a washing machine according to the present invention is formed through the press molding of the metal plate, respectively, the first member and the second member is spaced apart from each other so that the center portion is in close contact with each other to form a belt groove for hanging the belt; A plurality of cooling vanes integrally provided on an outer circumferential portion of the first member and molded through injection of a resin material with the first member embedded therein; It characterized in that it comprises a plurality of engaging projections which are extended and then formed to extend from one of the two members from one of the two members so that the central portion of the first member and the second member can be mutually coupled.

In addition, the first member is characterized in that a plurality of binding holes are formed to be bound to each other through the inflow of the molten resin when the cooling wing is molded.

In addition, the first member is characterized in that a plurality of binding protrusions protruding to be embedded in the molten resin when the cooling wing is molded.

In addition, the method for manufacturing a motor pulley for a washing machine according to the present invention includes a belt groove for fastening a belt and a method for manufacturing a motor pulley for a washing machine having a plurality of cooling wings for cooling the motor, the centers of which are closely coupled to each other. Forming a first member and a second member of which the outer peripheral parts are spaced apart from each other through press molding of a metal plate, and forming the cooling blade together with the outer peripheral part of the first member for forming; A coupling process of closely coupling the central portions of the first member and the second member to each other; And a bending molding step of bending the cooling blades formed in the first member in the direction of the motor.

In addition, the press molding process is a step of forming a shaft coupling hole in the center of the first member and the second member for the shaft coupling of the motor, and of the two members for the central coupling of the first member and the second member And a step of forming a joining protrusion which protrudes from one side to the other, and a joining hole formed at a side facing each other so that the joining protrusion passes.

In addition, the coupling process is characterized in that it comprises a step of expanding the end of the coupling protrusion in the state in which the coupling protrusion is coupled to penetrate through the coupling hole.

In addition, the method for manufacturing a motor pulley for a washing machine according to the present invention includes a belt groove for fastening a belt and a method for manufacturing a motor pulley for a washing machine having a plurality of cooling wings for cooling the motor, the centers of which are closely coupled to each other. A press molding process of molding the first member and the second member having the outer circumferential portions spaced apart from each other through press molding of a metal plate for forming; A cooling wing molding step of molding the cooling wing integrated with the first member, and molding the cooling wing through injection molding of a resin material in a state in which the first member is embedded in a mold; And a coupling process of closely coupling the central portions of the first member and the second member to each other.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a cross-sectional view showing the configuration of a washing machine to which a motor pulley according to the present invention is applied. As shown, the washing machine includes a water tank 2 installed inside the main body 1 to enable fresh water of the wash water, a dewatering tank 3 rotatably installed inside the water tank 2, and laundry. It is provided with a pulsator (4) rotatably installed in the inner lower portion of the dehydration tank (3) for the stirring of the wash water. The lower part of the water tank 2 is for driving the dehydration tank 3 and the pulsator 4, and a motor 5 and a power transmission device 6 are installed, and the motor 5 and power transmission device 6 are provided. Is connected via a belt (7) and pulleys (8, 10) to enable the transmission of rotational power.

2 to 4 show the configuration of the motor pulley for a washing machine according to the first embodiment of the present invention and a manufacturing method thereof. As shown in FIG. 2, the motor pulley 10 of the first embodiment is coupled to each other after the upper first member 11 and the lower second member 12 are separately formed through press molding of a metal plate. Prepared in such a way. At this time, the motor pulley 10 protrudes in a direction facing each other so that the central portion of the first member 11 and the central portion of the second member 12 may be closely coupled to each other, and the first member 11 and the second member ( The outer circumferential portion of 12) is formed to be inclined in a direction spaced apart from each other so that the belt groove 13 for hanging the belt (7) can be formed. This is configured such that the belt groove 13 can be formed by the inclined outer peripheral portion when the central portion of the two members (11, 12) is coupled.

In addition, as shown in FIGS. 2 and 3, the shaft coupling hole 14 penetrates the shaft 5a of the motor 5 to the center of the first member 11 and the second member 12. Is formed, and the shaft engaging hole 14 has a portion 14a of which the inner circumference is straight so that the motor pulley 10 can be coupled to the shaft 5a of the motor 5 in a restricted state. Is formed. This is because the engaging portion 14a is correspondingly coupled to the flat portion 5b formed on the outer surface of the shaft 5a of the motor so that the motor pulley 10 can be coupled in a restricted state with respect to the shaft 5a of the motor. It is. In FIG. 2, reference numeral 5b is a washer coupled to the shaft 5a to support the motor pulley 10, and reference numeral 5d is a fixing nut fastened to the shaft for fixing the motor pulley 10.

In addition, as shown in FIGS. 2 and 4 (a), the first member 11 and the second member 12 are firmly formed at the centers of the first member 11 and the second member 12 which are in close contact with each other. A plurality of coupling protrusions 15a and 15b are formed to protrude from the first member 11 and the second member 12 to the opposite side so as to be bound, and are formed at positions corresponding to the coupling protrusions 15a and 15b. Opposing pieces are formed with coupling holes 16a and 16b through which coupling protrusions 15a and 15b are penetrated. In addition, the coupling protrusions 15a and 15b are extended to the end portions of the coupling protrusions 15a and 15b so that the first member 11 and the second member 12 are coupled to each other. At this time, the shaft coupling hole 14, the coupling protrusions 15a and 15b, the coupling holes 16a and 16b formed in the first member 11 and the second member 12 are the first member 11 and the second member. The member 12 is molded in the process of press molding.

In addition, as shown in FIGS. 2 and 3, the outer circumferential portion of the first member 11 includes an extension portion 17 that extends further in the radial direction, and the outer circumference portion of the extension portion 17 includes the motor 5. A plurality of cooling wings 18 for cooling are formed. In this case, as shown in FIG. 3, the extension part 17 and the cooling wing 18 are molded together in the process of forming the first member 11 through an integral metal plate, and the cooling wing 18 is press-molded. After being molded to maintain the same plane as the extension portion 17, the process is bent toward the motor (5).

Figure 4 shows step by step the manufacturing process of the motor pulley according to the first embodiment of the present invention. This will be described according to the manufacturing sequence as follows.

In order to manufacture the motor pulley 10, first, as shown in FIG. 4 (a), a process of separately molding the first member 11 and the second member 12 as described above through press molding of a metal plate ( 21). The press molding step 21 is a process for forming the shaft coupling hole 14 in the center of the first member 11 and the second member 12 through a punching operation, and the combination of the two members (11, 12) And a step of molding the coupling protrusions 15a and 15b and the coupling holes 16a and 16b, and a step of forming the cooling blade 18 to be integrated with the first member 11 by using a press mold.

After the press molding step 21, as shown in FIG. 4B, the two members 11 and 12 are joined to each other so that the coupling protrusions 15a and 15b are coupled to the coupling holes 16a and 16b. In, the coupling process 22 is performed such that the ends of the coupling protrusions 15a and 15b are expanded by a conventional caulking operation. Through this process, the first member 11 and the second member 12 form a rigid coupling with each other.

After the joining step 22, as shown in FIG. 4 (c), the bending molding step 23 of bending the cooling blades 18 formed on the outer circumferential portion of the first member 11 in the direction of the motor 5 is bent. Do this. This is achieved by bending and erecting the cooling blades 18 formed in the same plane with the extension 17 of the first member 11 in a press molding process 21 to be substantially perpendicular to the extension 17. When the blade 10 rotates, the cooling blades 18 may cause a cooling wind to cool the motor 5.

Thus, the motor pulley 10 of the first embodiment of the present invention can be easily manufactured at low cost because the motor pulley 10 can be manufactured through a press forming process 21, a joining process 22, and a bending forming process 23 of a cooling blade. You can do it.

5 to 7 show the configuration of the washing machine motor pulley according to the second embodiment of the present invention and a manufacturing method thereof. As shown in FIG. 5, the motor pulley 100 of the second embodiment is coupled to each other after the upper first member 110 and the lower second member 120 are separately molded through press molding of a metal plate. Prepared in such a way. In addition, unlike the first embodiment described above, the second embodiment is formed by injection molding of a resin material such as a plastic cooling blade 180 provided to be integral with the outer peripheral portion of the first member 110.

The motor pulley 100 of the second embodiment has the same outer diameter of the first member 110 and the second member 120 through press molding of a metal plate. In addition, as in the first embodiment, the center portion of the first member 110 and the center portion of the second member 120 protrude in mutually facing directions so as to be in close contact with each other, and the first member 110 and the second member ( The outer circumferential portion of the 120 is formed to be inclined in a direction spaced apart from each other so that the belt groove 130 for hanging the belt (7) can be formed. In addition, the second embodiment is the shaft coupling hole 140 for the coupling of the motor shaft (5a), the coupling protrusions (150a, 150b) and the coupling hole for coupling the first member 110 and the second member 120 ( 160a and 160b are configured in the same manner as in the first embodiment. Therefore, description of these parts will be omitted.

In the cooling blade 180 of the second embodiment, the first member 110 is completed by press molding, and then the injection molding of the resin material is carried out in the state in which the first member 110 is embedded in a mold for molding the cooling blade 180. Through the cooling blade 180 is molded to be integrated with the first member (110). That is, the first member 110 can be fixed in a state embedded in the central portion of the cooling blade 180.

In this case, as shown in FIG. 7, the connection part of the first member 110 and the cooling blade 180 overlaps a part of the cooling blade 180 on the outer surface of the first member 110 to achieve a firm coupling. And a plurality of binding holes 111 are formed at the outer circumferential portion of the first member 110 so that the molten resin can be fixed while being introduced into the binding holes 11 when the cooling wings 180 are molded. It is composed. In addition, a plurality of binding protrusions 112 protruding toward the cooling blade 180 are formed at the outer circumference of the first member 110 to be embedded in the molten resin when the cooling blade 180 is molded. The binding protrusion 112 is for firm coupling of the cooling blade 180 and the first member 110 like the binding hole 111.

6 shows step by step the manufacturing process of the motor pulley according to the second embodiment of the present invention. This will be described according to the manufacturing sequence as follows.

In order to manufacture the motor pulley 100 of the second embodiment, as shown in FIG. 6 (a), a process of separately molding the first member 110 and the second member 120 through press molding of a metal plate ( 210). The press molding process 210 is a process of forming the shaft coupling hole 140 in the center of the first member 110 and the second member 120 through a punching operation, and the coupling for coupling the two members (110, 120) And forming the protrusions 150a and 150b and the coupling holes 160a and 160b.

After the press molding process 210, as shown in Fig. 4 (b), injection molding of a resin material such as plastic in a state in which the first member 110 is pre-arranged in the mold for forming the cooling blade 180. Through the cooling wing molding process 220 for forming the cooling wing 180 is performed. In this case, as shown in FIG. 7, the first member 110 is coupled to the outer circumferential portion in a state of being integrated with the cooling blade 180, and achieves a strong coupling through the binding hole 111 and the binding protrusion 112.

After the cooling wing molding process 230, as shown in Figure 4 (c), by combining the first member 110 and the second member 120, the coupling protrusions (150a, 150b) is coupled to the coupling hole (160a, In the state to be coupled to 160b), the coupling step 230 is performed to extend the ends of the coupling projections (150a, 150b) through a conventional caulking operation. Through this process, the first member 110 and the second member 120 form a firm coupling with each other.

As described above, the motor pulley 100 according to the second embodiment of the present invention can be manufactured through the press forming process 210 of the metal plate, the cooling wing forming process 220 through the injection molding, and the joining process 230, and thus, at a low cost. It is easy to manufacture.

As described above in detail, the motor pulley for a washing machine according to the present invention may be manufactured through a bending molding process of a cooling blade combined with a first member and a second member by a process of molding the first member and a second member through press molding. In the process of molding the first member and the second member, the process of injection molding the cooling wing, and the process of joining the first member and the second member, can be easily manufactured at a lower cost than before. have.

Claims (13)

First and second members each formed through press molding of the metal plate, the center parts of which are tightly coupled to each other, and the outer circumference parts of the first and second members are spaced apart from each other to form a belt groove for fastening the belt; A plurality of coupling protrusions extending from one of the two members and penetrating from the other of the two members so that the central portions of the first and second members may be coupled to each other; And a plurality of cooling vanes integrally provided with the first member on an outer circumference of the first member. The method of claim 1, A shaft coupling hole is formed at the center of the first member and the second member so that the shaft of the motor can be coupled, and the shaft coupling hole has a portion of the inner circumference so as to be coupled to the shaft of the motor in a restricted rotational state. The motor pulley for a washing machine, characterized in that the engaging portion is formed in a straight line. First and second members each formed through press molding of a metal plate and having outer center portions spaced apart from each other so that a central portion is closely coupled to each other and a belt groove for fastening the belt is formed; A motor pulley for a washing machine, which is provided integrally with an outer circumferential part of the first member, and includes a plurality of cooling wings that are molded through injection of a resin material in a state in which the first member is embedded. The method of claim 3, The first member and the second member is a motor pulley for a washing machine, characterized in that the central portion is provided with a plurality of coupling protrusions extending from one of the two members so as to pass through the other side so as to be mutually coupled. The method of claim 3, The first member is a motor pulley for a washing machine, characterized in that a plurality of binding holes are formed to be bound to each other through the inflow of the molten resin when the cooling blade is molded. The method of claim 3, The first member has a motor pulley for a washing machine, characterized in that a plurality of binding protrusions protruding to be embedded in the molten resin when the cooling blade is molded. The method of claim 3, A shaft coupling hole is formed at the center of the first member and the second member so that the shaft of the motor can be coupled, and the shaft coupling hole has a portion of the inner circumference so as to be coupled to the shaft of the motor in a restricted rotational state. The motor pulley for a washing machine, characterized in that the engaging portion is formed in a straight line. In the manufacturing method of a motor pulley for a washing machine having a belt groove for fastening the belt and a plurality of cooling wings for cooling the motor, The first member and the second member of which the center parts are tightly coupled to each other and the outer circumference parts are spaced apart from each other to form the belt groove are formed by pressing a metal plate, respectively, and the cooling blades are molded together on the outer circumference of the first member. A press molding process; A coupling process of closely coupling the central portions of the first member and the second member to each other; And a bending molding step of bending the cooling blades formed in the first member in the direction of the motor. The method of claim 8, The press molding process includes forming a shaft coupling hole in the center of the first member and the second member for shaft coupling of the motor, and any one of the two members for center coupling of the first member and the second member. A method of manufacturing a motor pulley for a washing machine comprising a step of forming a coupling protrusion protruding from one side to another and a coupling hole formed in a side facing the coupling protrusion so as to penetrate. The method of claim 9, The coupling process is a motor pulley manufacturing method for a washing machine comprising the step of expanding the end of the coupling protrusion in the state in which the coupling protrusion is coupled to penetrate the coupling hole. In the manufacturing method of a motor pulley for a washing machine having a belt groove for fastening the belt and a plurality of cooling wings for cooling the motor, A press molding process of forming a first member and a second member each of which has a central portion closely coupled to each other and whose outer circumference portions are spaced apart from each other to form the belt groove through press molding of a metal plate; A cooling wing molding step of molding the cooling wing integrated with the first member, and molding the cooling wing through injection molding of a resin material in a state in which the first member is embedded in a mold; Method for manufacturing a motor pulley for a washing machine comprising a coupling step of closely coupling the central portion of the first member and the second member. The method of claim 11, The press molding process includes forming a shaft coupling hole in the center of the first member and the second member for shaft coupling of the motor, and any one of the two members for coupling the central portion of the first member and the second member. A method of manufacturing a motor pulley for a washing machine comprising a step of forming a coupling protrusion protruding from one side to another and a coupling hole formed in a side facing the coupling protrusion so as to penetrate. The method of claim 12, The coupling process is a motor pulley manufacturing method for a washing machine comprising the step of expanding the end of the coupling protrusion in the state in which the coupling protrusion is coupled to penetrate the coupling hole.