WO2013141622A1

WO2013141622A1 - Spindle motor

Info

Publication number: WO2013141622A1
Application number: PCT/KR2013/002336
Authority: WO
Inventors: 최운호
Original assignee: 주식회사 휴모테크
Priority date: 2012-03-23
Filing date: 2013-03-21
Publication date: 2013-09-26

Abstract

A spindle motor according to the present invention comprises: a shaft having a recess formed in a lower end thereof; a rotor case coupled to an upper portion of the shaft such that the rotor case rotates together with the shaft, the rotor case having a magnet attached to an inner wall thereof; a bearing for rotatably supporting the shaft; a support washer coupled to a lower portion of the bearing and having a space formed inside the center thereof the support washer having a side wall with a flow channel groove; a bearing housing formed to contact outer surfaces of the bearing and the support washer and having a flow channel formed in a lengthwise direction at the point corresponding to the flow channel groove; and a stator core coupled to an outer surface of the bearing housing.

Description

Spindle motor

The present invention relates to a motor. More specifically, the present invention relates to a spindle motor having a new structure with an oil circulation structure and an improved manufacturing process.

In general, an optical disc player such as a CD or DVD player or a recent Blu-ray player rotates the turntable by a spindle motor while the disc is loaded on the turntable to reproduce the information recorded on the disc.

Such spindle motors have been developed in various forms, and are manufactured by applying various processes. For example, in Korean Patent No. 10-1063341, the bearing housing is made of the same material as the washer at the end of the shaft. The spindle motor is manufactured by sequentially assembling a slit washer and a bearing therein.

Such a motor has a high manufacturing cost because the bearing housing is made of the same material as the washer, and the bearing housing may be damaged or the position may not be aligned correctly when the slit washer and the bearing are pressed into the bearing housing. .

On the other hand, the shaft that is rotationally supported by the bearing rotates inside the bearing, and oil is used as a lubricant to smooth the rotation. This oil also leaks out of the bearing as the shaft rotates. If the oil can be circulated by allowing the oil to flow out of the bearing back to the inside of the bearing, the oil can be recycled to extend the life of the motor.

Therefore, the inventors of the present invention form a bearing housing by insert injection, while improving the structure of the process and the motor to enable insert injection in a state where the bearing is placed in the injection mold during insert injection, and at the same time, a structure for circulating oil in the bearing housing. The present invention proposes a method for manufacturing a spindle motor and a spindle motor having a new structure.

It is an object of the present invention to provide a method for manufacturing a spindle motor which can improve the manufacturing process and improve the quality of the spindle motor and at the same time lower the manufacturing cost.

Another object of the present invention is to provide a spindle motor having a structure that enables insert injection in a state where a bearing is placed in a mold.

The above and other inherent objects of the present invention can be easily achieved by the present invention described below.

Spindle motor according to the first embodiment of the present invention is a shaft having a recess in the lower end side;

A rotor case coupled to an upper portion of the shaft and rotating together with the shaft and having a magnet attached to an inner circumferential wall thereof;

A bearing for rotationally supporting the shaft;

A support washer coupled to the lower portion of the bearing, the support washer having a space portion inside the center portion, and having a sidewall portion having a flow path groove formed therein;

A bearing housing formed in contact with an outer circumferential surface of the bearing and the support washer and having a flow path formed in a longitudinal direction at a position corresponding to the flow path groove; And

A stator core coupled to an outer circumferential surface of the bearing housing;

Characterized in that consists of.

In the first embodiment of the present invention, the lower surface of the bearing may be formed in the groove from the position corresponding to the flow path groove to the center portion.

In the first embodiment of the present invention, an opening may be formed on the outer lower surface of the support washer.

Spindle motor according to a second embodiment of the present invention includes a shaft having a recess in the lower end side;

A bearing supporting the shaft and having an inner end groove formed at a lower end thereof;

Located in the lower portion of the bearing, and has a space portion in the center, a contact portion protruding around the space portion is formed, a first flow path groove is formed around the contact portion, the first flow path groove and the space portion A support washer having a second flow path groove for connecting;

A bearing housing formed in contact with an outer circumferential surface of the bearing and the support washer and having a flow path formed in a longitudinal direction at a position corresponding to the second flow path groove; And

Characterized in that consists of.

In the second embodiment of the present invention, the lower portion of the bearing housing, a hole in which the contact portion of the bearing and the support washer is formed in the center, and the plate is formed in the plate channel groove in the position corresponding to the flow path It may also be included.

The manufacturing method of the spindle motor according to the present invention

Engaging a support washer at the bottom of the bearing;

Positioned in the insert injection mold together with the plate with the bearing and support washers engaged; And

Forming a bearing housing by insert injection;

In the insert injection mold, at least one pin supports the support washer, and the supporting contact portion becomes an opening part after the injection is completed.

The present invention provides a method for manufacturing a spindle motor that can improve the manufacturing process and improve the quality of the spindle motor and at the same time lower the manufacturing cost, and to enable insert injection with the bearing placed in the mold, and to have an oil circulation structure. It has the effect of providing the invention.

1 is a cross-sectional view showing the structure of a spindle motor according to a first embodiment of the present invention.

2 is a perspective view showing a support washer applied to the spindle motor according to the first embodiment of the present invention.

3 is a cross-sectional perspective view showing a bearing housing in a state in which a bearing and a support washer applied to a spindle motor according to the first embodiment of the present invention are coupled to each other.

4 is a cross-sectional view showing the structure of a spindle motor according to a second embodiment of the present invention.

5 is a perspective view showing a support washer applied to a spindle motor according to a third embodiment of the present invention.

6 is a cross-sectional view showing a bearing housing formed in a state in which a support washer and a bearing are applied to a spindle motor according to a third embodiment of the present invention.

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

1, the spindle motor according to the first embodiment of the present invention is largely the bearing housing 10, the bearing 20, the support washer 30, the plate 40, the stator core 50, the rotor case ( 60) and the shaft 70.

In the first embodiment of the present invention, the bearing housing 10 is formed by insert injection molding after placing the bearing 20 and the support washer 30 in the insert injection mold. Conventionally, after the bearing housing is formed by resin molding, a process of inserting the bearing and the slit washer at the shaft end is applied. This is because it is difficult to maintain the correct position of the bearing because the flow of the injection is flowed into the bearing and at the same time the bearing is flowed by the pressure of the injection.

In order to solve this problem, the present invention is first placed in the insert injection mold in a state in which the support washer 30 previously formed of the injection molding is bonded to the distal end of the bearing 20. Next, a pin is formed in the injection mold to fix the opening 31 of the outer lower surface of the support washer 30. The pin is used to fix the position of the support washer 30, and then insert injection is performed. The bearing housing 10 is formed.

Further, in the first embodiment of the present invention, the bearing housing 10 is placed in the insert injection mold together with the plate 40 in a state in which the bearing 20 and the support washer 30 are coupled, and then insert injection molding. Is formed. In this way, the bearing housing 10 is formed by insert injection, and at the same time, four parts of the bearing housing 10 and the bearing 20, the support washer 30, and the plate 40 are inserted at one time by one insert injection process. In addition, through such a process, the bearing can be prevented from being damaged, changed, or damaged by pressing the bearing in the future or coupling the cap to the bearing housing by a spinning process. Insert molding is possible with the alignment in place, resulting in improved product quality.

The magnet 61 rotates the rotor case 60 by the change of the magnetic field provided by the stator core 50. The suction magnet 63 is fixed and coupled to the inner upper portion of the rotor case 60, and similarly prevents the injuries of the rotor case 60 as a magnet for applying a pulling force to the stator core 50. The shaft 70 is press-fitted into the bearing 20, and serves to support the rotor case 60 to rotate smoothly.

The recessed part 71 is formed in the lower end side of the shaft 70. The slit washer 25 is engaged with the recess 71. This slit washer 25 serves to prevent the upper deviation of the rotary shaft. The slit washer 25 is located under the bearing 20.

2 is a perspective view showing a support washer 30 applied to the spindle motor according to the first embodiment of the present invention.

The support washer 30 shown in FIG. 2 is applied to the case where four grooves at 90 degree intervals are formed on the outside of the bearing 20. The end of the bearing 20 is seated on the seating portion 33. If the slit washer 25 is applied, the seating portion 33 is seated with the slit washer 25, and the end of the shaft 70 is spaced. It is located at (32).

A side wall portion 34 is formed along the outer circumferential surface of the seating portion 33 to surround the lower outer circumference of the bearing 20, and at least one flow path groove 34a and 35b is formed in the side wall portion. In FIG. 2, two

flow path grooves

34a and 34b are formed, but the present invention is not necessarily limited to the two

flow path grooves

34a and 34b. These flow

path grooves

34a and 34b are portions into which pins formed corresponding to the number of

flow path grooves

34a and 34b are inserted into the injection mold at the time of insert injection of the bearing housing 10. Therefore, when the insert injection is completed, the

flow path grooves

34a and 34b are formed along the shape of the pin, and at the same time, the flow path (13 in FIG. 3) is also formed inside the bearing housing 10.

The flow path 13 and the

flow path grooves

34a and 34b allow air inside the bearing to flow out when the shaft is press-fitted, and at the same time, when the lubricant flows out to the upper part of the bearing during the operation of the motor, the bearing again It can be gathered inside the housing lower side. To this end, the groove is formed in the shaft longitudinal direction at a position corresponding to the outer circumferential surface of the bearing 20, and a flow path is formed at a position corresponding to the lower surface of the bearing 20. Therefore, the life of the bearing and the motor can be improved by the flow path groove and the flow path.

The protrusion 35 is coupled to a groove on the outside of the bearing in which the pin of the mold is not inserted, thereby preventing the injection of the injection into the support washer 30 and at the same time preventing the bearing 20 from slipping.

3 is a cross-sectional perspective view showing a bearing housing 10 in a state in which a support washer 30 and a bearing 20 are applied to a spindle motor applied to a first embodiment of the present invention.

As shown in FIG. 3, an oil passage 11 is formed at an upper portion of the bearing housing 10, and at least one passage 13 is in a direction perpendicular to the oil passage 11, that is, the bearing housing ( 10) is formed in the longitudinal direction. Although two flow paths 13 may be formed as shown in Fig. 3, the flow paths 13 are not necessarily limited to two, and various flow paths 13 may be applied as necessary. The lubricating oil discharged to the upper portion of the bearing along the oil passage 11 is allowed to flow back into the bearing lower side through the passage 13. That is, it has a structure in which the oil circulates in the direction of the arrow shown in FIG.

On the other hand, the first inclined portion 21 and the second inclined portion 22 are formed on the upper outer circumferential surface of the bearing 20. At the time of insert injection, a protrusion 12 is formed inside the upper part of the bearing housing 10, the height of which is in contact with the second inclined portion 22 and formed higher. Thereby, the bearing 20 can be prevented from escaping upward by rotation. Of course, the protrusion 12 of the bearing housing 10 may have a height up to the first inclined portion 21.

As described above, at least one opening 31 should be formed in the lower exposed portion of the support washer 30. The opening 31 is formed at the position where the pin for fixing the bearing-support washer assembly at the time of insert injection was located.

The plate 40 is preferably coupled with the bearing housing at the same time as the insert injection. On the other hand, it is also possible to form the entire plate 40 as an insert injection molding.

The process applied to the spindle motor manufacturing method according to the first embodiment of the present invention through the structure as described above is as follows.

First, the support washer 30 is coupled to the lower portion of the bearing 20. At this time, the support washer 30 is engaged in a state in which the slit washer 25 is positioned under the bearing 20.

Next, the bearing 20 and the support washer 30 are positioned inside the insert injection mold in a state where they are coupled. At least one pin supports the support washer in the mold for insert injection, and the supporting portion becomes the opening 31 after the injection is completed. In addition, at least one separate pin (not shown) is present in the mold, and the separate pin is inserted at a position corresponding to the groove outside the bearing 20 and the flow path groove 34a of the support washer 30. . Therefore, when injection is completed, a flow path is formed in the bearing housing. At this time, the plate 40 is placed in the mold together so that the injection is completed while the plate is bound to the outside of the bearing housing. Of course, the entire plate may be formed by injection molding.

Thereafter, the stator core 50 is coupled to the outside of the bearing housing 10, the shaft 70 is pressed into the bearing, and the rotor case 60 is pressed into the shaft end.

4 is a cross-sectional view showing the structure of the spindle motor according to the second embodiment of the present invention, Figure 5 is a perspective view showing a support washer 30 applied to the spindle motor according to the second embodiment of the present invention, Figure 6 10 is a cross-sectional view illustrating the bearing housing 10 formed in a state in which the support washer 80 and the bearing 20 applied to the spindle motor according to the third embodiment of the present invention are coupled to the plate 40.

4 to 6, the spindle motor according to the second embodiment of the present invention has a structure similar to that of the first embodiment, but other structures such as the support washer 80 are applied. Mainly explaining the differences as follows.

The contact portion 83 which slightly protrudes above the support washer 80 is formed to contact the lower portion of the bearing 20. In addition, an inner end groove 23 is formed at the lower end of the bearing 20 so that the slit washer 25 is inserted into the inner end groove 23.

On the other hand, the oil flowing down through the flow path 13 formed in the longitudinal direction in the bearing housing 10 is the first flow path groove 82 and the contact portion (are formed around the contact portion 83 of the support washer 80) It has a structure that flows into the space portion 81 which is a space formed in the center of the support washer 80 through at least one second flow path groove (84) formed in the (83). In the case of the first embodiment, the role of the second flow path groove 84 is different from that of the groove formed in the lower surface of the bearing 20. The spindle motor according to the second embodiment of the present invention has a structure in which oil circulates in the direction of an arrow shown in FIG. 6.

Around the contact portion 83 of the support washer 80 slightly protrudes upward, the protruding portion is fitted to the center of the plate 40 is fixed. Thus, when the bearing housing 10 is formed by insert injection in the state in which the plate 40 is engaged with the support washer 80, it is suitable for maintaining the engagement state of the support washer 80 and the plate 40. do. On the other hand, the plate flow path groove 41 is formed at the portion where the plate 40 and the flow path 13 meet, so that the plate 40 does not block the flow path 13 and the pin is inserted into the plate flow path at the time of insert injection. It can be inserted into the groove (41).

The spindle motor according to the second embodiment of the present invention is located in the insert injection mold with the bearing 20 and the support washer 80 coupled to the center of the plate 40, and then the bearing housing ( 10) form. Therefore, since four parts can be combined by one process of insert injection, the number of processes can be reduced and the production cost can be reduced.

It should be noted that the detailed description of the present invention described above is merely illustrative for the purpose of understanding the present invention and is not intended to limit the scope of the present invention. The scope of the invention is defined by the claims appended hereto, and simple variations and modifications within this scope should be construed as contradicting the invention.

Claims

A shaft having a recess on the lower end side;

A rotor case coupled to an upper portion of the shaft and rotating together with the shaft and having a magnet attached to an inner circumferential wall thereof;

A bearing for rotationally supporting the shaft;

A support washer coupled to the lower portion of the bearing, the support washer having a space portion inside the center portion, and having a sidewall portion having a flow path groove formed therein;

A bearing housing formed in contact with an outer circumferential surface of the bearing and the support washer and having a flow path formed in a longitudinal direction at a position corresponding to the flow path groove; And

A stator core coupled to an outer circumferential surface of the bearing housing;

Spindle motor, characterized in that consisting of.
The spindle motor according to claim 1, wherein the lower surface of the bearing is formed in the groove from the position corresponding to the flow path groove to the center portion.
The spindle motor of claim 1, wherein an opening is formed on an outer lower surface of the support washer.
A shaft having a recess on the lower end side;

A rotor case coupled to an upper portion of the shaft and rotating together with the shaft and having a magnet attached to an inner circumferential wall thereof;

A bearing supporting the shaft and having an inner end groove formed at a lower end thereof;

Located in the lower portion of the bearing, and has a space portion in the center, a contact portion protruding around the space portion is formed, a first flow path groove is formed around the contact portion, the first flow path groove and the space portion A support washer having a second flow path groove for connecting;

A bearing housing formed in contact with an outer circumferential surface of the bearing and the support washer and having a flow path formed in a longitudinal direction at a position corresponding to the second flow path groove; And

A stator core coupled to an outer circumferential surface of the bearing housing;

Spindle motor, characterized in that consisting of.
The bearing housing of claim 4, further comprising a plate formed at a lower portion of the bearing housing in a hole in which a contact portion of the bearing and the support washer is inserted, and a plate flow path groove formed at a position corresponding to the flow path. Spindle motor, characterized in that.
Engaging a support washer at the bottom of the bearing;

Positioned in the insert injection mold together with the plate with the bearing and support washers engaged; And

Forming a bearing housing by insert injection;

The method of claim 1, wherein at least one pin supports the support washer in the insert injection mold, and the supporting contact portion becomes an opening part after the injection is completed.