CN116137474A

CN116137474A - Motor for washing machine

Info

Publication number: CN116137474A
Application number: CN202111583561.5A
Authority: CN
Inventors: 朴承柱; 梁耿植; 孙永珉
Original assignee: New Motech Co Ltd
Current assignee: New Motech Co Ltd
Priority date: 2021-11-16
Filing date: 2021-12-22
Publication date: 2023-05-19
Also published as: KR20230071254A; KR102576783B1

Abstract

The motor for washing machine of the invention is characterized by comprising: a motor housing including a stator, manufactured by resin molding; and a fixing bracket combined with the rear face of the motor housing, inserting the rear bearing into the concave part of the bearing cover combined with the fixing bracket, and forcibly pressing the outer peripheral surface of the bearing cover into the inner peripheral surface of the inner concave part of the rear resin molding part of the motor housing, so that the motor housing is combined with the fixing bracket.

Description

Motor for washing machine

Technical Field

The present invention relates to a motor for a washing machine. More particularly, the present invention relates to a motor for a washing machine, which shortens an assembly process and reduces an overall size of the motor by improving an assembly structure of a fixing bracket for fixing the motor for driving a drum of the washing machine or dryer and the motor, so as to secure an installation space of the motor.

Background

In general, a washing machine includes: a rotary drum which is cylindrical and is used for accommodating the laundry; and a motor connected to the rotary shaft behind the rotary drum via a belt to drive the rotary drum. Such a motor needs to be fixed to a body of a washing machine or dryer, and a housing or bracket for fixing the motor is made of aluminum or bulk molding compound (BMC, bulk Molding Compound) resin. In the case of using aluminum, since noise or vibration occurs at a motor fixing portion and material costs are high, a bulk molding compound resin has recently been applied to a motor housing and a bracket. Under the condition of using bulk molding compound resin, the method has the advantages of obvious small noise and vibration and strong moisture resistance.

In a state where a fixing bracket formed of a bulk molding compound resin and a motor housing are fastened in a motor using the bulk molding compound resin, the fixing bracket is provided inside a washing machine body so that the washing machine is stably driven by a belt in a state where the motor is supported by the fixing bracket, which is representatively disclosed in korean patent No. 10-1707142. According to this prior art, a coupling hole is drilled in the lower surface of the motor housing, and fastening is performed with the coupling hole by means of a coupling bolt through a fixing hole formed in the first bracket and the second bracket, thereby fixing the bracket supporting the motor to the motor.

However, since the screw is formed in the coupling hole formed in the lower surface of the motor housing, when the coupling bolt is fastened to the coupling hole, there is a problem in that a crack (ack) phenomenon occurs in the coupling hole, and the motor cannot be held in a firm state due to a reduction in fastening force, and durability is remarkably reduced.

In addition, according to the above-mentioned related art washing machine motor, since the motor is assembled through the process of inserting the bearing cap into the rear bearing to protect the rear bearing, the assembly process of the motor is complicated, the motor housing and the respective brackets are required to be coupled by coupling bolts, and the assembly process is complicated, and thus there is a problem in that the productivity of the washing machine motor is lowered.

Further, since the above-mentioned brackets are provided in at least one, i.e., a plurality of, and are combined with the motor housing, respectively, an assembling process is increased, and a reinforcing function is lacking between the first bracket and the second bracket, so that it is difficult to stably combine the motor with the dryer body. In addition, in a state where the fixing holes formed in the first bracket and the second bracket are matched with the coupling holes of the motor housing, it is necessary to insert the coupling bolts to assemble the screws, and it is difficult to accurately match the fixing holes and the coupling holes, so that there is a problem in that productivity is low.

In order to solve the above problems, the present inventors have proposed a motor for a washing machine having a novel structure.

Disclosure of Invention

The invention aims to provide a novel structure of a motor for a washing machine, which can stably combine the motor with a washing machine or a dryer body and shorten the assembly process of a motor shell and a fixed bracket.

Another object of the present invention is to provide a motor for a washing machine having a novel structure in which a motor housing and a fixing bracket are accurately and easily fastened.

The above and other objects and advantages of the present invention will be readily attained by the present invention as described below.

The motor for washing machine of the invention is characterized by comprising: a motor housing 11 including a stator 12, manufactured by resin molding; and a fixing bracket 20 coupled to a rear surface of the motor housing 11, wherein the rear bearing 16 is inserted into a recess 311 of a bearing cap 310 coupled to the fixing bracket 20, and an outer circumferential surface 312 of the bearing cap 310 is forcibly pressed into an inner circumferential surface 113 of an inner recess 111 of a rear resin mold 110 of the motor housing 11, so that the motor housing 11 is coupled to the fixing bracket 20.

Preferably, in the present invention, the fixing bracket 20 includes, in an integrated manner: a plug-in cylinder 21 having a central hole 210; a quadrangular locking piece 211 protruding outward at a predetermined interval around the outside of the plug-in cylindrical body 21; a coupling hole 211A formed in the quadrangular locking piece 211; a circular frame body 23 integrally formed with a reinforcing sheet 22 around the outside of the insert cylinder 21; a reinforcing rib 24 protruding to the rear side of the circular frame body 23; and a cylindrical second fixed supporting portion 25 formed at the end of the reinforcing rib 24.

Preferably, in the present invention, the inner cylindrical body 313 of the bearing cap 310 is inserted into and coupled to the center hole 210 of the insert cylindrical body 21, and the coupling bolt B is inserted into the coupling hole 211A of the quadrangular locking piece 211 protruding outward around the outer side of the insert cylindrical body 21 with a predetermined interval therebetween and coupled to the coupling screw hole 310A formed in the bearing cap 310, thereby coupling the bearing cap 310 to the fixing bracket 20.

Preferably, in the present invention, the outer circumferential surface 312 of the bearing cap 310 is formed in a thin plate-shaped cylinder to maintain elasticity.

Preferably, in the present invention, the nut 115 is insert-molded inside the bolt insertion hole 112A formed at the step 112 of the inside concave portion 111 of the rear resin molded portion 110 of the motor housing 11, so that the coupling bolt B is screw-coupled with the nut 115.

Preferably, in the present invention, an elastic member 400 formed of rubber or silica gel is inserted into an insertion groove 113A formed inside an inner circumferential surface 113 of an inner recessed portion 111 of the rear resin mold portion 110, and an outer circumferential surface 312 of the bearing cap 310 is forcibly pressed into an inner circumferential surface 400A of the elastic member 400, thereby elastically coupling the bearing cap 310 to the rear resin mold portion 110 of the motor housing 11.

The invention has the following effects that the motor shell is easily fastened in the washing machine body by the motor for the washing machine with novel structure, thereby preventing noise and vibration by firm combination while shortening the assembly process.

The present invention has an effect that the bearing cap is fixed to the fixing bracket by the coupling bolt, and the screw-coupling is performed by inserting the distal end of the screw portion of the coupling bolt into the nut of the bolt insertion hole formed in the step of the inner concave portion of the rear resin mold of the motor housing by insert injection molding, thereby preventing damage of the motor housing and improving the fastening force to achieve firm coupling.

The present invention has the effect that the supporting leg part forming the fixing bracket is provided by forming one fixing body through the reinforcing rib, so that the motor combined with the fixing bracket is stably arranged without shaking to prevent noise and vibration.

Also, the present invention has an effect that the installation space of the motor can be minimized by downsizing the motor housing.

Drawings

Fig. 1 is a perspective view of a motor for a washing machine according to the present invention, as viewed from the front.

Fig. 2 is a perspective view of the motor for the washing machine of the present invention as viewed from the rear.

Fig. 3 is a perspective exploded view of the motor for the washing machine according to the present invention, in which the bearing cover is detached from the fixing bracket and is seen from the front.

Fig. 4 is an exploded perspective view of the motor for a washing machine according to the present invention, in which a bearing cover is coupled to a fixing bracket and is seen from the front.

Fig. 5 is a perspective exploded view of the motor for the washing machine according to the present invention, in which the bearing cap is disassembled from the fixing bracket and is seen from the rear.

Fig. 6 is a sectional view showing a state in which a fixing bracket is disassembled in the motor for the washing machine of the present invention.

Fig. 7 is a sectional view showing a state that a fixing bracket is coupled to a motor for a washing machine according to the present invention.

Fig. 8 is a sectional view showing still another embodiment of the motor for a washing machine of the present invention in a state of disassembling the fixing bracket.

Fig. 9 is a sectional view showing another embodiment of the state of coupling the fixing bracket in the motor for the washing machine of the present invention.

The present invention will be described in detail below with reference to the drawings.

Detailed Description

Fig. 1 is a perspective view of a motor 10 for a washing machine according to the present invention as viewed from the front, and fig. 2 is a perspective view of the motor 10 for a washing machine according to the present invention as viewed from the rear. The motor 10 of the present invention is provided inside a body of a washing machine or dryer, not shown, in a state where the motor housing 11 is fastened to the fixing bracket 20, so that the rotary drum of the washing machine or dryer is stably rotated by a belt or the like in a state where the motor 10 is supported by the fixing bracket 20. The term "motor for washing machine" is mainly described in the present specification, but is not limited to the motor for washing machine, and although the term is described, the term is also applicable to a motor for a dryer for laundry or other purposes.

The motor housing 11 of the motor 10 for a washing machine of the present invention is formed of a bulk molding compound type resin film molded by placing the stator 12 in an insert injection mold. The cylindrical first fixed support portion 14 is formed so as to protrude to one side while being held at a predetermined angle to the front outside of the motor case 11. A rotary shaft 15 that penetrates the center of the motor housing 11 and rotates is coupled to the rotor 13 facing the stator 12 and rotates together, and a drive wheel 15A that rotates together with the rotary shaft 15 is coupled to the front of the rotary shaft 15 and drives a drum (not shown) of the dryer or the washing machine by a belt (not shown).

Fig. 3 is a perspective view of the motor 10 for the washing machine of the present invention, in which the bearing cap 310 is detached from the fixing bracket 20, and viewed from the front, fig. 4 is a perspective view of the motor 10 for the washing machine of the present invention, in which the bearing cap 310 is coupled to the fixing bracket 20, and viewed from the front, and fig. 5 is a perspective exploded view of the motor 10 for the washing machine of the present invention, in which the bearing cap 310 is detached from the fixing bracket 20, and viewed from the rear.

The fixing bracket 20 may include in an integrated manner: a plug-in cylinder 21 having a central hole 210; a quadrangular locking piece 211 protruding outward at a predetermined interval around the outside of the plug-in cylindrical body 21; a coupling hole 211A formed in the quadrangular locking piece 211; a circular frame body 23 integrally formed with the reinforcing sheet 22 around the outside of the insert cylinder 21; a reinforcing rib 24 protruding to the rear side of the circular frame body 23; and a cylindrical second fixed supporting portion 25 formed at the end of the reinforcing rib 24.

The inner cylindrical body 313 of the bearing cap 310 is inserted into the center hole 210 of the insert cylindrical body 21, the coupling bolts B are inserted into the coupling holes 211A of the quadrangular locking pieces 211, and the quadrangular locking pieces 211 are coupled with the coupling screw holes 310A formed in the bearing cap 310, so that the quadrangular locking pieces 211 protrude outward around the outer side of the insert cylindrical body 21 with a predetermined interval therebetween, and the bearing cap 310 is firmly coupled to the fixing bracket 20. The fixing bracket 20 may have a plurality of square locking pieces 211 of the insert cylinder 21.

The first cylindrical fixed support portion 14 and the second cylindrical fixed support portion 25 of the fixing bracket 20, which are formed to protrude toward the front side of the motor housing 11, may be formed to protrude at a predetermined interval while maintaining the same angle such that the entire weight of the motor housing 11 is directed to the first cylindrical fixed support portion 14 and the second cylindrical fixed support portion 25 of the motor housing 11 and the fixing bracket 20, respectively, thereby preventing the motor housing 11 from being inclined in any one side direction to stably install the motor 10.

The first cylindrical fixing support portion 14 of the motor housing 11 and the second cylindrical fixing support portion 25 of the fixing bracket 20 are illustrated as being provided below in the illustrated drawings, but are not limited thereto, and may be provided above or laterally of the motor housing 11 and the fixing bracket 20.

In order to provide the motor 10 to the washing machine or dryer, coupling holes 14', 25' are formed at the center of the cylindrical first and second fixed supporting

parts

14 and 25, respectively, constituting the fixed bracket 20.

Fig. 6 is a sectional view showing a state in which the fixing bracket 20 is disassembled in the motor 10 for the washing machine of the present invention, and fig. 7 is a sectional view showing a state in which the fixing bracket 20 is coupled in the motor 10 for the washing machine of the present invention.

In the coupling of the motor housing 11 and the fixing bracket 20, the rear bearing 16 is inserted into the concave portion 311 of the bearing cap 310 coupled to the fixing bracket 20, and the outer circumferential surface 312 of the bearing cap 310 is forcibly pressed into the inner circumferential surface 113 of the inner concave portion 111 of the rear resin mold 110 of the motor housing 11, so that the motor housing 11 is coupled to the fixing bracket 20. Meanwhile, the outer circumferential surface 312 of the bearing cap 310 is formed in a thin plate-shaped cylinder to maintain the elastic force, so that when the inner circumferential surface 113 of the inner concave portion 111 of the rear resin mold 110 is forcibly pressed, a firm coupling is achieved with a further improved fastening force by the elastic press.

When the bearing cap 310 is forcibly press-fitted into the inner peripheral surface 113 of the inner recessed portion 111 of the rear resin molded portion 110, the rear locking hook 114 of the rear resin molded portion 110 can be brought into surface contact with the front surface around the rear edge 310B of the bearing cap 310 to be tightly bonded.

With this structure, the present invention can omit the assembly process of the rear bearing cap 310 when assembling the motor 10, thereby shortening the assembly process and increasing the bonding strength of the rear bearing cap 310.

Also, in the present invention, the peripheral size of the motor housing 11 can be minimized by inserting the fixing bracket 20 coupled with the bearing cap 310 into the inner peripheral surface 113 of the inner concave portion 111 of the rear resin mold portion 110 of the motor housing 11.

Fig. 8 is a cross-sectional view showing still another embodiment of the state of the fixing bracket 20 in the motor 10 for a washing machine of the present invention, and fig. 9 is a cross-sectional view showing another embodiment of the state of the fixing bracket 20 combined in the motor 10 for a washing machine of the present invention.

As shown in fig. 8 and 9, the coupling bolt B can be screwed to the nut 115 by insert-molding the nut 115 into the bolt insertion hole 112A formed in the step 112 of the inner recessed portion 111 of the rear resin molded portion 110 of the motor case 11.

Accordingly, it is possible to prevent damage and breakage of the bolt insertion hole 112A for screw assembly of the motor housing 11 by screw-coupling the coupling bolt B with the nut 115 insert-molded inside the bolt insertion hole 112A, thereby further improving the fastening force and coupling the motor housing 11 and the fixing bracket 20 with a more firm fastening force.

Further, it is preferable that an elastic member 400 made of rubber or silicone is inserted into an insertion groove 113A formed inside an inner peripheral surface 113 of an inner recessed portion 111 of the rear resin mold portion 110, and an outer peripheral surface 312 of the bearing cap 310 is forcibly pressed into an inner peripheral surface 400A of the elastic member 400, thereby elastically coupling the bearing cap 310 and the rear resin mold portion 110 of the motor housing 11.

Thus, noise or vibration generated when the motor 10 is driven can be absorbed by the elastic member 400, thereby preventing noise or vibration.

It should be noted that the above description of the invention is merely illustrative for better understanding of the invention and is not intended to limit the scope of the invention. The scope of the invention is defined by the scope of the invention as claimed, and it should be understood that simple modifications or variations of the invention within the scope of the invention are included.

Claims

1. A motor for washing machine is characterized in that,

comprising the following steps:

a motor housing including a stator, manufactured by resin molding; and

a fixing bracket combined with the rear face of the motor shell,

the rear bearing is inserted into the concave portion of the bearing cap combined with the fixing bracket, and the outer peripheral surface of the bearing cap is forcibly pressed into the inner peripheral surface of the inner concave portion of the rear resin molding portion of the motor housing, so that the motor housing is combined with the fixing bracket.

2. A motor for a washing machine according to claim 1, wherein,

the fixing bracket includes:

a male cylinder having a central hole;

a quadrangular locking piece protruding outward at a predetermined interval around the outside of the plug-in cylinder;

a coupling hole formed in the quadrangular locking piece;

a circular frame body integrally formed with a reinforcing sheet around the outside of the insert cylinder;

a reinforcing rib protruding to the rear side of the circular frame body; and

and a cylindrical second fixed support part formed at the end of the reinforcing rib.

3. The motor for a washing machine according to claim 2, wherein an inner cylinder of the bearing cap is inserted into and coupled to a center hole of the insert cylinder, and a coupling bolt is inserted into a coupling hole of a locking piece of a quadrangular shape and coupled to a coupling screw hole formed in the bearing cap, and the locking piece of the quadrangular shape protrudes outward around an outer side of the insert cylinder with a predetermined interval therebetween, thereby coupling the bearing cap to the fixing bracket.

4. The motor of claim 1, wherein the outer circumferential surface of the bearing cap is formed in a thin plate-shaped cylinder to maintain elasticity.

5. The motor for a washing machine according to claim 1, wherein a nut insert is injection-molded inside a bolt insertion hole formed at a step of an inner concave portion of the rear resin mold of the motor housing such that a coupling bolt is screw-coupled with the nut.

6. A motor for a washing machine according to claim 1, wherein,

an elastic member formed of rubber or silicone is inserted into an insertion groove formed inside an inner peripheral surface of an inner recessed portion of the rear resin mold,

the inner peripheral surface of the elastic member is forcibly pressed into the outer peripheral surface of the bearing cap, so that the bearing cap is elastically coupled to the rear resin molding portion of the motor housing.