Motor for washing machine

Abstract

The washing machine motor of the present invention is characterized in that it includes: a motor housing, including a stator, which is made of resin molding; and a fixing bracket, which is combined with the rear surface of the motor housing, wherein a plurality of connecting portions are combined with a plurality of cylindrical fixing portions, the connecting portions are formed by injection molding nuts through inserts spaced at predetermined intervals inside the rear surface of the motor housing, and the fixing portions are formed by protruding from the front of the fixing bracket at predetermined intervals.

Description

Technical Field

[0001] This invention relates to a mounting structure for a motor used in a washing machine. More specifically, this invention relates to a motor mounting structure that shortens the assembly process and reduces the overall size of the motor by improving the mounting bracket and motor assembly structure for fixing the motor that drives the drum of a washing machine or dryer, thereby facilitating the securing of installation space for the motor. Background Technology

[0002] Typically, a washing machine or dryer includes: a rotating drum, cylindrical in shape, for holding laundry; and a motor, which drives the drum via a belt connected to a rotating shaft at the rear of the drum. This motor needs to be fixed to the body of the washing machine or dryer, and the housing or bracket for fixing the motor is made of aluminum or bulk molding compound (BMC) resin. Due to the high cost of aluminum, noise or vibration occurs at the motor mounting points; therefore, bulk molding compound resin has recently been used for motor housings and brackets. Using bulk molding compound resin offers advantages such as significantly lower noise and vibration, and stronger moisture resistance.

[0003] In a motor using this type of bulk molding compound resin, a fixing bracket formed of bulk molding compound resin is fastened to the motor housing. A fixing bracket is then installed inside the washing machine body, allowing the motor to be stably driven by a belt while supported by the fixing bracket. This technology is representatively disclosed in Korean Patent No. 10-1707142. According to this prior art, a connecting hole is drilled in the lower surface of the motor housing, and a connecting bolt is used to fasten the motor to the fixing holes formed by the first and second brackets, thereby fixing the motor support bracket to the motor.

[0004] However, the mating hole formed on the lower surface of the motor housing has threads. Since the motor housing is made of bulk molding compound, when the mating bolts are tightened in the mating hole, the following problem occurs: cracks occur inside the mating hole. Due to the reduced tightening force, the motor cannot maintain a firm connection, and the durability is significantly reduced.

[0005] Furthermore, since there are at least one, or multiple, brackets, each individually integrated with the motor housing, the assembly process is not only somewhat complex, but the lack of reinforcement between the first and second brackets makes it difficult to stably integrate the motor with the dryer body. Moreover, even with the fixing holes formed on the first and second brackets matching the mating holes on the motor housing, bolts need to be inserted to assemble the screws, making accurate matching of the fixing holes and mating holes difficult, thus resulting in low productivity.

[0006] In order to solve the above problems, the inventors have proposed a mounting device for a washing machine motor with a novel structure. Summary of the Invention

[0007] The purpose of this invention is to provide a novel structure for a washing machine motor that enables stable assembly of the motor and shortens the assembly process of the motor housing and the mounting bracket.

[0008] Another object of the present invention is to provide a washing machine motor with a novel structure that allows for accurate and easy fastening of the motor housing and the mounting bracket.

[0009] The above-mentioned and other inherent objectives of the present invention can be easily achieved by the present invention as described below.

[0010] The washing machine motor of the present invention is characterized by comprising: a motor housing 11 including a stator 12, which is made of resin molding; and a fixing bracket 20, which is combined with the rear surface of the motor housing 11, wherein a plurality of connecting portions 110 are combined with a plurality of cylindrical fixing portions 25, wherein the connecting portions are formed by injection molding nuts 112 with inserts spaced at predetermined intervals inside the rear surface of the motor housing 11, and the fixing portions are formed by protruding from the front of the fixing bracket 20 with predetermined intervals.

[0011] Preferably, in this invention, the motor housing 11 is connected to the fixing bracket 20 by connecting the connecting bolt B that passes through the fixing part 25 and the nut 112 provided in the connecting part 110.

[0012] Preferably, in the present invention, in the joint portion 110, an embedded protrusion 111 is formed protruding rearward from the rear surface 11A of the motor housing 11 at a predetermined interval, and in the embedded protrusion 111, a rear embedded hole 111A formed in the center communicates with the assembly screw hole 112A of the nut 112.

[0013] Preferably, in this invention, the fixing bracket 20 includes a circular front frame 22, and the fixing part 25 includes: a stop part 251 disposed in the middle of the inner hollow part 25A on the inner side of the fixing part 25; a connecting bolt insertion hole 251A formed in the center of the stop part 251; a front embedding space part S1 for inserting the embedding protrusion 111 in front of the stop part 251; and a rear embedding space part S2 so that the head B' of the connecting bolt B is located behind the stop part 251.

[0014] Preferably, in this invention, the aforementioned inserting protrusion 111 is inserted into the front inserting space S1 of the aforementioned fixing part 25, and the rear end of the aforementioned inserting protrusion 111 makes surface contact with the front surface of the aforementioned stop part 251.

[0015] The rear bearing 16 is attached to the rear bearing cover 16A, which is injection molded around the inner side of the rear bearing cover placement portion 21 by insert injection molding. The rear bearing cover placement portion 21 is integrally formed at the center of the front frame 22.

[0016] Through the aforementioned bolt insertion hole 251A and the rear insertion hole 111A of the aforementioned embedded protrusion 111, the aforementioned bolt B is threaded into the aforementioned nut 112, thereby connecting the aforementioned motor housing 11 with the aforementioned fixing bracket 20.

[0017] Preferably, in this invention, embedded guide vanes 111-1 are formed at both ends of the embedded protrusion 111 of the joint portion 110 constituting the motor housing, and embedded guide grooves 25-1 are formed at both ends of the front cylindrical fixing portion 25 of the fixing bracket 20, so that the embedded guide vanes 111-1 at both ends of the embedded protrusion 111 can be guided and embedded along the embedded guide grooves 25-1.

[0018] Preferably, in this invention, a first magnet N1 insert with a bolt insertion hole N1' is injection molded behind a nut 112 formed by injection molding the first magnet N1 insert into the insert protrusion 111 of the connecting portion 110 constituting the motor housing. In front of the stop portion 251 formed inside the fixing portion 25, a second magnet N2 insert with a bolt insertion hole N2' is injection molded around the inner side of the cylindrical fixing portion 25, thereby achieving a connection through the first magnet N1 and the second magnet N2.

[0019] The present invention has the following advantages: the motor housing is easily secured by the fixing bracket set inside the dryer body of the washing machine motor with the novel structure, thereby shortening the assembly process and preventing noise and vibration through a firm connection.

[0020] Furthermore, the present invention has the following effects: by using a connecting bolt and a nut for threaded connection, the connecting bolt is inserted into the fixing bracket and connected to the joint of the motor housing, and the nut is set inside the joint of the motor housing by an insert to prevent damage to the joint of the motor housing and increase the fastening force, thereby achieving a firm connection.

[0021] Furthermore, the present invention has the following effect: by forming a fixed body through reinforcing ribs to provide the load-bearing legs constituting the fixed bracket, the motor coupled with the fixed bracket can be stably installed without shaking, thereby improving work efficiency.

[0022] Furthermore, the present invention has the following effect: by forming the joint portion of the motor housing corresponding to the fixing portion of the fixing bracket around the inner side of the rear surface of the motor housing, the size of the motor housing can be miniaturized, thereby minimizing the installation space of the motor. Attached Figure Description

[0023] Figure 1 This is a perspective view of the motor for a washing machine according to the present invention, viewed from the front.

[0024] Figure 2 A perspective view of the motor for a washing machine according to the present invention, viewed from the rear.

[0025] Figure 3 A perspective view of the washing machine motor of the present invention, taken from the front, showing its disassembled form.

[0026] Figure 4 A perspective view of the washing machine motor of the present invention, taken from the rear, showing its disassembled state.

[0027] Figure 5 This is a cross-sectional view showing the disassembled fixed bracket in the motor for a washing machine according to the present invention.

[0028] Figure 6 This is a cross-sectional view of the washing machine motor of the present invention in the state of being coupled with the fixed bracket.

[0029] Figure 7 This is a perspective view showing another embodiment in which the joint portion of the motor housing and the cylindrical fixing portion of the fixing bracket of the present invention are modified.

[0030] Figure 8 This is a cross-sectional view showing another embodiment in which the joint of the motor housing and the cylindrical fixing part of the fixing bracket of the present invention are modified.

[0031] The present invention will now be described in detail with reference to the accompanying drawings. Detailed Implementation

[0032] Figure 1 A perspective view of the washing machine motor 10 of the present invention, viewed from the front. Figure 2 This is a perspective view of the washing machine motor 10 of the present invention viewed from the rear. With the motor housing 11 secured to the fixing bracket 20, the motor 10 of the present invention is disposed inside the body of a washing machine or dryer (not shown), thereby stably driving the rotating drum of the washing machine or laundry dryer via a belt or the like while the motor 10 is supported by the fixing bracket 20. This specification primarily describes a "washing machine motor," but is not limited to washing machine motors; although the term is used, it can also be applied to motors for laundry dryers or other applications.

[0033] like Figure 1and Figure 2 As shown, the motor housing 11 and the fixing bracket 20 of the washing machine motor 10 of the present invention are provided in a manner that allows them to be joined or disassembled by the connecting bolts B described later.

[0034] The motor housing 11 of the motor 10 of the present invention is formed by insert injection molding of a bulk molding compound containing a stator 12 and a rotor 13. A cylindrical first fixed support portion 14 is formed at a predetermined angle to the front and outer side of the motor housing 11 and protrudes to one side. A drive pulley 15A is attached to the front of a rotating shaft 15 that passes through the center of the motor housing 11 and rotates therethrough. The drive pulley 15A rotates together with the rotating shaft 15 and drives the drum (not shown) of a dryer or washing machine via a belt (not shown).

[0035] The fixed bracket 20 is integrally formed as follows: a circular front frame 22, with a rear bearing cover placement portion 21 for the motor housing 11 formed at the center; a reinforcing rib 23, which protrudes to the rear side of the front frame 22; and a cylindrical second fixed support portion 24 formed at the end of the reinforcing rib 23. However, multiple cylindrical fixed portions 25 with hollow portions can be formed inside the front of the circular front frame 22 at predetermined intervals.

[0036] The cylindrical first fixed support portion 14 and the cylindrical second fixed support portion 24 of the fixed bracket 20, which protrude from the front side of the motor housing 11, can maintain the same angle and protrude at a predetermined interval, so that the overall weight of the motor housing 11 is oriented towards the respective cylindrical first fixed support portion 14 and second fixed support portion 24 of the motor housing 11 and the fixed bracket 20, thereby preventing the motor housing 11 from tilting to either side and stably mounting the motor 10.

[0037] The cylindrical first fixed support portion 14 of the motor housing 11 and the cylindrical second fixed support portion 24 of the fixed bracket 20 are shown in the attached drawings as being located at the bottom, but they may also be located at the top of the motor housing 11 and the fixed bracket 20.

[0038] Figure 3 A perspective view of the washing machine motor 10 of the present invention, taken from the front. Figure 4 A perspective view of the washing machine motor 10 of the present invention, taken from the rear, showing its disassembled form.

[0039] The rotating shaft 15 of the motor 10 of the present invention is supported such that it can be rotated rearward by a rear bearing 16. A rear bearing cover 16A, inserted into the rear bearing 16, can be disposed around the inner side of a rear bearing cover placement portion 21, which is integrally formed at the center of the front frame 22 of the fixing bracket 20. Preferably, the rear bearing cover 16A is integrally formed with the rear bearing cover placement portion 21 of the front frame 22 by insert injection molding. In this way, the assembly process of the rear bearing cover 16A can be omitted when assembling the motor 10, thereby shortening the assembly process and increasing the bonding strength of the rear bearing 16.

[0040] The rear surface 11A of the motor housing 11 has a connecting portion 110 that protrudes rearward at a predetermined interval. Corresponding to the connecting portion 110, the cylindrical fixing portion 25 of the fixing bracket 20 is formed in a connecting manner. The motor housing 11 and the fixing bracket 20 can be fastened and connected by connecting bolt B through the fixing portion 25 and connecting it to the connecting portion 110.

[0041] Preferably, the joint portion 110 of the motor housing 11 and the cylindrical fixing portion 25 of the fixing bracket 20 are respectively formed at the position corresponding to the vertex of an equilateral triangle (the symmetrical position), thereby achieving a stable and balanced connection between the motor housing 11 and the fixing bracket 20.

[0042] In the joint portion 110 of the motor housing 11 described above, an embedded protrusion 111 is formed protruding rearward from the rear surface 11A of the motor housing 11 at a predetermined interval. A nut 112 insert is injection molded inside the embedded protrusion 111, but preferably, the rear embedded hole 111A of the embedded protrusion 111 is formed in a communicating manner with the assembly screw hole 112A of the nut 112.

[0043] Furthermore, in this invention, it is preferable that the embedded protrusion 111 of the joint portion 110 constituting the motor housing 11 is designed in a manner that it is located in the rear inner circumferential direction of the rear surface 11A of the motor housing 11. Since the joint portion is conventionally formed in the circumferential portion of the motor housing 11, the circumferential dimension of the motor housing 11 increases, but the present invention can minimize the circumferential dimension of the motor housing 11.

[0044] The circular front frame 22 constituting the fixed bracket 20 has multiple cylindrical fixing parts 25 that are integrally formed and protrude at predetermined intervals. In order to mount the motor 10 on the body of the washing machine or dryer, connecting holes 14' and 24' are formed at the center of the first cylindrical fixing support 14 and the center of the second cylindrical fixing support 24, respectively.

[0045] Figure 5 This is a cross-sectional view showing the disassembled fixed bracket 20 in the washing machine motor 10 of the present invention. Figure 6 This is a cross-sectional view of the washing machine motor 10 of the present invention in the state of being coupled with the fixing bracket 20.

[0046] The motor housing 11 of the present invention is manufactured by molding resin material with the stator 12 placed in an insert injection mold. Preferably, bulk molding compound (BMC) resin is used as the resin material. Thus, the motor housing 11 is formed into a single component by molding the stator 12 and the resin.

[0047] The rotating shaft 15 passes through the center of the motor housing 11. Inside the motor housing 15, there is a space for inserting a rotor 13, which is connected to and rotates together with the rotating shaft 15. The rear surface of the motor housing 11 has multiple rearwardly protruding connecting portions 110.

[0048] The connecting portion 110 has a rearwardly protruding inserting protrusion 111, which is inserted into a cylindrical fixing portion 25 formed in the fixing bracket 20. The cylindrical fixing portion 25 is divided into a front space and a rear space by a blocking portion 251. The front space is the front inserting space S1, and the rear space is the rear inserting space S2.

[0049] The rear bearing 16 is attached to the rear bearing cover 16A, which is injection molded around the inner side of the rear bearing cover placement part 21 by insert injection molding. The rear bearing cover placement part 21 is integrally formed in the center of the circular front frame 22.

[0050] When the embedded protrusion 111 is engaged in the front embedded space S1, the rear end of the embedded protrusion 111 makes face contact with the front surface of the stop 251 and is placed in the front embedded space S1. At the same time, the engaging bolt B passes through the engaging bolt insertion hole 251A through the center hole of the stop 251 and the corresponding rear embedded hole 111A of the embedded protrusion 111. The engaging bolt B is threadedly engaged with the nut 112, which is injection molded into the insert inside the embedded protrusion 111, thereby engaging the motor housing 11 and the fixing bracket 20.

[0051] With the rear bearing cover 16A embedded in the rear bearing 16, and the embedded protrusion 111 of the connecting part 110 and the front embedded space S1 of the fixing part 25 in a double-connected state, this connecting structure of the present invention can provide a triple-connected state by the connecting bolt B, thereby achieving a more robust and stable connection.

[0052] In particular, by threading the connecting bolt B with the nut 112, which is injection-molded into the insert inside the embedded protrusion 111, damage or breakage of the threaded assembly hole for the motor housing 11 can be prevented, thereby improving the tightening force. Furthermore, since the embedded protrusion 111 constituting the motor housing 11 is secured by the connecting bolt B while the cylindrical fixing portion 25 is inserted into the space S1 in front of it, operability is improved, thus shortening assembly time. In addition, the secure connection prevents vibration or noise during motor operation.

[0053] Figure 7 This is a perspective view showing another embodiment in which the joint 110 of the motor housing 11 and the cylindrical fixing part 25 of the fixing bracket 20 of the present invention are modified. Figure 8 This is a cross-sectional view showing another embodiment of the present invention, in which the joint portion 110 of the motor housing 10 and the cylindrical fixing portion 25 of the fixing bracket 20 are modified.

[0054] like Figure 7 As shown, embedded guide vanes 111-1 protrude from both ends of the embedded protrusion 111 that constitutes the motor housing, and embedded guide grooves 25-1 are formed at both ends of the cylindrical fixing part 25 of the fixing bracket 20. Since the embedded guide vanes 111-1 at both ends of the embedded protrusion 111 can be guided and joined along the embedded guide grooves 25-1, easy joining can be achieved.

[0055] Furthermore, in the other embodiment described above, when the embedded guide vanes 111-1 at both ends of the embedded protrusion 111 are inserted into the embedded guide groove 25-1, since the embedded protrusion 111 is embedded in the space S1 in front of the cylindrical fixing part 25, even if the connecting bolt B is loosened or damaged due to external impact, the fastening force can be maintained, thereby more firmly maintaining the connection between the motor housing 11 and the fixing bracket 20, while preventing twisting to achieve a more stable connection.

[0056] Reference Figure 8Inside the embedded protrusion 111 of the joint portion 110 constituting the motor housing, a first magnet N1 insert with a bolt insertion hole N1' is injection molded behind the nut 112 which is injection molded by the insert. In front of the stop portion 251 of the cylindrical fixing portion 25 of the fixing bracket 20, a second magnet N2 insert with a bolt insertion hole N2' is injection molded around the inner side of the cylindrical fixing portion 25. The first magnet N1 and the second magnet N2 can quickly and accurately make surface contact due to mutual attraction, so that the embedded protrusion 111 constituting the joint portion 110 of the motor housing can be easily inserted and fitted into the embedded space S1 in front of the cylindrical fixing portion 25. The first magnet N1 and the second magnet N2 are respectively provided in any one of the multiple embedded protrusions 111 and the cylindrical fixing portion 25, so that the motor housing 11 and the fixing bracket 20 can be joined together by accurate alignment.

[0057] It should be noted that the above description of the present invention is for illustrative purposes only and is not intended to limit the scope of the invention. The scope of the invention is defined by the scope of the claims, and it should be understood that simple modifications or variations of the invention within that scope are included within the scope of the invention.

Claims

1. A washing machine motor, characterized by comprising: a motor housing including a stator manufactured by resin molding; and a fixing bracket combined with a rear surface of the motor housing, a plurality of combined portions combined with a plurality of fixing portions in a cylindrical shape, the combined portions being formed by insert injection molding nuts inside the rear surface of the motor housing at a predetermined interval, the fixing portions being formed protruding at a predetermined interval in front of the fixing bracket, the motor housing being combined with the fixing bracket by combining a combined bolt passing through the fixing portions with the nuts provided at the combined portions, an insertion protrusion being formed protruding at a predetermined interval from the rear surface of the motor housing toward the rear in the combined portions, the nuts being provided inside the insertion protrusion by insert injection molding, an insertion hole formed at the center of the insertion protrusion communicating with a screw hole of the nut, the fixing bracket including a front frame in a circular shape, the fixing portions including: a stop portion provided in the middle of an inner hollow portion of the fixing portions; a combined bolt insertion hole formed at the center of the stop portion; a front insertion space portion for inserting the insertion protrusion in front of the stop portion; and a rear insertion space portion having a head portion of the combined bolt located at the rear of the stop portion, the insertion protrusion being inserted into the front insertion space portion of the fixing portions, and a rear end of the insertion protrusion being in surface contact with a front surface of the stop portion, a rear bearing being combined with a rear bearing cover provided around the inside of a rear bearing cover placement portion integrally formed at the center of the front frame by insert injection molding, the combined bolt insertion hole and the rear insertion hole of the insertion protrusion corresponding to each other, the combined bolt passing through the combined bolt insertion hole and the rear insertion hole and being combined with the nut, so that the motor housing is combined with the fixing bracket. Insertion guide vanes are formed protruding at both ends of the insertion protrusion of the combined portion constituting the motor housing, and insertion guide grooves are formed at both ends of the fixing portions in a cylindrical shape of the fixing bracket in front, so that the insertion guide vanes at both ends of the insertion protrusion can be guided along the insertion guide grooves and be fitted.

2. A washing machine motor according to claim 1, characterized in that, A first magnet having a bolt insertion hole formed therein is insert injection molded at the rear of the nut provided by insert injection molding inside the insertion protrusion of the combined portion constituting the motor housing, 3. The washing machine motor according to claim 1, characterized in that, a second magnet having a bolt insertion hole formed therein is insert injection molded around the inside of the fixing portions in a cylindrical shape at the front of the stop portion formed at the inside of the fixing portions, so that the combined portions are combined by the first and second magnets. ​

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