JPH05300706A - Motor - Google Patents

Abstract

PURPOSE:To make efficient manufacture possible by reducing the numbers of applications of an ultraviolet-ray setting adhesive agent and ultraviolet radiation in the case of gluing adjoining two parts to a peripheral wall part. CONSTITUTION:An ultraviolet-ray setting adhesive agent 64 is applied from above to the cut-off parts between a plurality of protrusions 62c and 62c provided in the peripheral part of the approximately-J-shaped bent part 62b of a seal cap member 62. The adhesive agent 64 extends through the cut-off parts also to all the peripheries of the intermediate inner peripheral surface 22c and the peripheral upper surface of the upside pole piece 56 in a first sealing part 54. And when ultraviolet rays are emitted on the adhesive agent 64 from above the seal cap member 62, the ultraviolet rays extend all over the adhesive agent 64 through the cut-off parts, and the adhesive agent 64 is hardened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION In the present invention, two adjacent parts are
The present invention relates to a motor device that is adhered to a peripheral wall portion of a motor device with an ultraviolet curable adhesive.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view of a main part of a conventional recording medium driving spindle motor device. In this spindle motor device, a rotor hub c is rotatably supported on a fixed support a via a ball bearing b, and a magnetic fluid seal d is provided between the ball bearing b and the outside of the motor device. Reference numeral e denotes a sealing component in which two pole pieces f and a permanent magnet body g between them are integrated, and is fixed to the inner peripheral portion of the rotor hub c by an ultraviolet curable adhesive h. i is a magnetic fluid magnetically retained between the fixed support a and the pole piece f.
The magnetic fluid seal d is composed of a sealing component e and a magnetic fluid i. Further, on the outer side of the magnetic fluid seal d, an annular flat plate-shaped seal cap j is adhered and fixed to the inner peripheral portion of the rotor hub c by an ultraviolet curable adhesive k. In order to bond and fix the sealing component e and the seal cap j with an ultraviolet curable adhesive, first, the sealing component e is arranged at a predetermined position on the rotor hub c, the adhesive h is applied, and the adhesive h It was necessary to irradiate ultraviolet rays on the surface of the rotor to cure the same, and then to dispose the seal cap j again at a predetermined position on the rotor hub c to apply the adhesive k, and to irradiate the adhesive k with ultraviolet rays to cure it.

As described above, conventionally, the adhesive application and the ultraviolet irradiation are performed twice for each of the two adjacent parts which are adhered to the peripheral wall portion of the motor device, so that the manufacturing process is complicated and the manufacturing cost is increased. I didn't get it.

The present invention has been made in view of the above problems existing in the prior art, and its object is to cure the ultraviolet rays when two adjacent parts are bonded to the peripheral wall portion. It is an object of the present invention to provide a motor device that can reduce the number of times the mold adhesive is applied and the ultraviolet irradiation can be performed and can be manufactured more efficiently.

[0005]

In order to achieve the above object, in a motor device of the present invention, a peripheral part of the motor device is in contact with a peripheral edge portion of the first component and a second component adjacent to the first component. Is in contact with the peripheral wall portion at a plurality of protrusions on its peripheral portion, and the ultraviolet curable adhesive is the first component and the second component through the notches formed between the protrusions of the second component. And the peripheral wall portion is hardened in a state where it has spread, and the first component, the second component, and the peripheral wall portion are bonded to each other.

[0006]

The adjacent first and second parts are both in contact with the peripheral wall. Of these, the second component is in contact with the peripheral wall portion at a plurality of protrusions provided on the peripheral portion thereof. Therefore, after the first component and the second component are arranged so as to be in contact with the peripheral wall portion, the adhesive agent of the ultraviolet curing type is applied once from the side not facing the first component. The first part, the second part, and the peripheral wall part are spread through the notches provided between them.

Thereafter, by irradiating the ultraviolet ray once from the side not facing the first component, the ultraviolet ray can be spread through the cutout portion into the adhesive, and the adhesive can be hardened. The second component and the peripheral wall portion can be bonded together.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3 relate to a spindle motor for driving a recording medium (for example, a hard disk) as one embodiment of the present invention, and FIG. 1 is a half sectional view thereof.

A stator core 12 is externally fitted and fixed to an upper and lower intermediate position of a cylindrical fixed column 10 made of a ferromagnetic material, and a stator coil 14 is wound around the stator core 12. 16 is a screw hole for fixing.

The rotor hub 20 has a substantially cylindrical shape, and the inner peripheral portion thereof has a small inner diameter portion 22 located at the upper end portion, a middle inner diameter portion 24 located below the lower inner diameter portion 22, and about two-thirds up and down below.
Has a large inner diameter portion 26 occupying the length thereof. Rotor hub 20
A protruding portion 28 is provided on the outer peripheral side of the lower end portion of the. An annular position detecting magnet 34 is provided in an annular groove 30 of the downward opening formed by the projecting portion 28 via a position detecting magnet yoke 32 having a substantially L-shaped cross section. The annular upper protrusion 36 on the upper side of the overhanging portion 28 is for supporting the lower surface of the recording medium (not shown) fitted onto the outer peripheral portion of the rotor hub 20. Again 38
Is a screw hole for fixing a clamp member (not shown) for fixing the recording medium.

The rotor yoke 42 has a substantially cylindrical shape and has a small diameter portion 42a located at the upper end portion and a large diameter portion 42b occupying about three-fourths below the small diameter portion 42a. This rotor yoke 42
The small diameter portion 42a is located inside the middle inner diameter portion 24, and the large diameter portion 42a
In the state where b is located inside the large inner diameter portion 26, the rotor hub 2
It is internally fixed to 0. Large diameter part 4 of rotor yoke 42
The lower end of 2b is located slightly above the lower end of the large inner diameter portion 26 of the rotor hub 20. And the rotor yoke 42
A cylindrical rotor magnet 44 is fixed to the large-diameter portion 42b.

A first ball bearing 46 is mounted between the inner peripheral surface of the small diameter portion 42a of the rotor yoke 42 and the outer peripheral surface of the fixed support column 10, and the large diameter portion 42b of the rotor yoke 42 is mounted.
Inner peripheral surface lower end portion and the large inner diameter portion 2 of the rotor hub 20.
The second ball bearing 50 is provided between the inner peripheral surface of the stainless steel bush 48 and the outer peripheral surface of the fixed column 10 which are fixed to the inner peripheral surface of the lower end portion of the outer peripheral surface 6 of the bush 6. Has been done. Thereby, in a state where the rotor magnet 44 and the stator core 12 face each other with a radial gap therebetween,
A rotor mainly composed of the rotor hub 20, the rotor yoke 42, and the rotor magnet 44 is rotatably supported on the fixed column 10.

The small inner diameter portion 22 of the rotor hub 20 has an annular inward projection 22a located at the lower end thereof, an annular outer recess 22b adjacent thereto, and an intermediate inner peripheral surface 22c located above it. And the radially enlarged inner peripheral surface 22 located thereabove
It consists of d.

Reference numeral 54 is a first sealing component in which two upper and lower annular plate-shaped pole pieces 56, 58 and an annular permanent magnet body 60 between them are integrated. The first sealing component 54 is inserted into the small inner diameter portion 22 from above,
The lower side of the outer periphery of the lower pole piece 58 is the inward projection 22a.
The outer peripheral surface of the upper pole piece 56 is in contact with the intermediate inner peripheral surface 22c.

Reference numeral 62 is a seal cap member. FIG. 2 shows a plan view of the seal cap member 62, and FIG. 3 shows a fragmentary perspective view of the main part thereof. The seal cap member 62 includes an annular flat plate portion 6 located on the inner peripheral portion.
2a, a substantially J-shaped bent portion 62b protruding downward on the outer peripheral side thereof, and a substantially inverted L-shaped protruding portion 6 protruding upward and outward thereof.
It consists of 2c. The protrusions 62c are provided for each 30 degree center angle, and a cutout 62d is provided between the protrusions 62c.

The seal cap member 62 is inserted into the small inner diameter portion 22 from above after inserting the first sealing component 54, and the lower end surface of the substantially J-shaped bent portion 62b is the upper surface of the pole piece 56. And the outer peripheral portion of the protrusion 62c is in contact with the lower end of the expanded inner peripheral surface 22d and the boundary between the expanded inner peripheral surface 22d and the intermediate inner peripheral surface 22c.

Then, an ultraviolet curable adhesive 64 is applied to the portions of the substantially J-shaped bent portion 62b, the protruding portion 62c and the notch portion 62d of the seal cap member 62 from above, and the adhesive 64 is substantially The upper side of the J-shaped bent portion 62b,
In addition to the periphery of the base of the protrusion 62c, the notch 62
Through d, the upper surface of the upper pole piece 56 of the first sealing component 54 also extends to the upper surface of the outer peripheral portion and the intermediate inner peripheral surface 22c over the entire circumference. In addition, the adhesive 64,
By irradiating ultraviolet rays from above the seal cap member 62, not only the adhesive 64 on the upper side of the substantially J-shaped bent portion 62b and the protruding portion 62c but also the substantially J-shaped portion through the cutout portion 62d.
The ultraviolet ray spreads throughout the adhesive 64 including the adhesive 64 on the lower side of the bent portion 62b and the protrusion 62c, and the adhesive 64 is cured. As a result, the first sealing component 5
4, the seal cap member 62, and the small inner diameter portion 22 of the rotor hub 20 are adhered and fixed by the adhesive 64.

Reference numeral 66 denotes a magnetic fluid magnetically held by the upper and lower pole pieces 56 and 58 and the fixed support column 10. The magnetic fluid 66 serves as a first magnetic fluid seal together with the first sealing component 54 and the fixed support column 10. I am configuring.

Reference numeral 68 is a seal holder made of aluminum. The seal holder 68 includes an annular flat plate portion 68a,
The annular flat plate portion 68a has an annular upper protrusion 68b at a radial intermediate position and an annular flat portion 68a having an annular lower protrusion 68c slightly outwardly of the annular flat plate portion 68a. The lower side of the outer peripheral portion is formed into an annular cutout portion 68d.

The upper protrusion 68b of the seal holder 68 is fitted into the annular groove 70 of the lower opening provided in the stainless steel bush 48, and the upper surface of the annular flat plate portion 68a abuts the lower surface of the bush 48. There is. Also, the annular flat plate portion 68a
The outer peripheral surface of the rotor abuts on the lower end of the large inner diameter portion 26 of the rotor hub 20. The upper protrusion 68b is in contact with the inner peripheral surface of the annular groove 70, and has a gap between the upper protrusion 68b and the annular groove 70 above and radially outward from the upper protrusion 68b.

In this state, the ultraviolet curable adhesive 72 is applied over the entire circumference so as to reach the notch 68d and the lower end of the large inner diameter portion 26 of the rotor hub 20, and then the adhesive 72 is exposed to ultraviolet light. Upon irradiation, the adhesive 72 is cured and the seal holder 68 is fixed to the rotor hub 20 in that state.

Reference numeral 74 is a second sealing component in which two upper and lower annular plate-shaped pole pieces 76 and 78 and an annular permanent magnet body 80 between them are integrated. The second sealing component 74 is inserted into the lower protrusion 68c from below, and the upper surface of the upper pole piece 76 has an annular flat plate portion 68a.
Touches the inner edge of the bottom surface of the. In this state, the ultraviolet curable adhesive 82 is applied to the entire circumference of the lower pole piece 78 and the lower protrusion 68c, and then the adhesive 82 is irradiated with ultraviolet rays, whereby the second seal is formed. The component 74 is adhesively fixed to the seal holder 68.

Reference numeral 84 denotes a magnetic fluid magnetically held by the upper and lower pole pieces 76 and 78 and the fixed support column 10. The magnetic fluid 84 serves as a second magnetic fluid seal together with the second sealing component 74 and the fixed support column 10. I am configuring.

The upper protrusion 68b of the seal holder 68.
Groove 70 in the bush 48 and the upper and outer peripheral surfaces of the
Since there is a gap between and, air can escape when the upper protrusion 68b is fitted into the annular groove 70. Further, due to the material, the seal holder 68 has a higher coefficient of thermal expansion than the bush 48, and the seal holder 68 has a lower rigidity in terms of material and shape. At times, the seal holder 68 is likely to be greatly deformed.
However, since the above-described space exists between the upper protrusion 68b and the annular groove 70, the seal holder 68 can be relatively thermally expanded in the direction of the space, which is caused by the difference in the coefficient of thermal expansion. The stress is not so great. Therefore, the second
The seal holder 68 is prevented from being greatly deformed such that the sealing component 74 and the fixed column 10 come into contact with each other.

The bracket member 86 has a cylindrical portion 88 protruding downward, and the fixed column 1 is provided inside the cylindrical portion 88.
The lower end of 0 is fixedly fitted inside. Further, the bracket member 86 has a through hole 92 whose upper portion is closed by a seal member 90 at a portion facing the position detecting magnet 34 in the rotation axis direction. A circuit board 94 is provided below the seal member 90. A magnetic sensor 96 for position detection is provided on the circuit board 94, and the magnetic sensor 96 is opposed to the position detection magnet 34 in the rotation axis direction with a seal member 90 interposed therebetween.

FIG. 4 is a half sectional view of a spindle motor for driving a recording medium (for example, a hard disk) as another embodiment of the present invention.

Reference numeral 100 is a columnar fixed column made of a ferromagnetic material, and 102 is a screw hole for fixing. Reference numeral 104 denotes an annular base portion 106 and an outer peripheral wall portion 1 located below the outer peripheral portion thereof.
08, and a rotor hub in the shape of a bowl, which is composed of an overhanging portion 110 provided on the outer peripheral portion of the lower end of the outer peripheral wall portion 108.
Reference numeral 112 denotes a screw hole for a screw used for fixing a clamp member (not shown) for fixing a recording medium (not shown) fitted onto the outer peripheral portion of the rotor hub 104, and penetrates in the rotation axis direction.

By disposing the first ball bearing 114 and the second ball bearing 116 above and below between the inner peripheral surface of the base portion 106 of the rotor hub 104 and the outer peripheral surface of the fixed support column 100, the rotor hub relative to the fixed support column 100 is arranged. 104 is rotatably supported.

Reference numeral 118 denotes an upper and lower annular plate-shaped pole pieces 120 and 122 and an annular permanent magnet body 12 between them.
4 is a sealing component integrally fixedly held inside a holder 126 having an annular L-shaped cross section. The sealing component 118 is the base 1 of the rotor hub 104.
The holder 126 is inserted from above from above, the lower surface of the holder 126 is supported on the outer ring 114a of the first ball bearing 114, and the outer peripheral surface of the holder 126 is in contact with the inner peripheral surface of the base portion 106.

The seal cap member 128 has an annular flat plate portion 128a located on the inner peripheral portion thereof, a substantially J-shaped bent portion 128b protruding downward on the outer peripheral side thereof, and a plurality of substantially inverted portions protruding upward and outward. It is composed of an L-shaped protrusion 128c. Protrusion 1
There is a notch between the portions 28c.

After inserting the sealing component 118, the seal cap member 128 is inserted into the inside of the base portion 106 from above, and the lower end surface of the substantially J-shaped bent portion 128b contacts the upper surface of the upper pole piece 120. The enlarged diameter portion 130 in which the outer peripheral portion of the protrusion 128c is formed on the upper end portion of the base portion 106.
Is in contact with.

The seal cap member 128 is generally J
An ultraviolet curable adhesive 132 is applied from above to the character-shaped bent portion 128b, the protruding portion 128c, and the notch, and the adhesive 132 is applied to the upper side of the substantially J-shaped bent portion 128b and the protruding portion 128c. In addition to the periphery of the base portion 106 at, the upper surface of the holder 126 in the sealing component 118 and the inner peripheral surface of the base portion 106 also extend over the entire circumference through the notches. Further, by irradiating the adhesive 132 with ultraviolet rays from above the seal cap member 128, not only the adhesive 132 on the upper side of the substantially J-shaped bent portion 128b and the protruding portion 128c but also the substantially J-shaped portion through the notch. Adhesive 132 under the bent portion 128b and the protrusion 128c
The ultraviolet rays spread throughout the adhesive 132 including the adhesive 132, and the adhesive 132 is cured. As a result, the sealing component 118, the seal cap member 128, and the inner peripheral surface of the base portion 106 of the rotor hub 104 are attached to the adhesive 1
It is in a state of being bonded and fixed by 32.

134 is the upper and lower pole pieces 120/12
2 is a magnetic fluid magnetically retained between the fixed column 100 and the fixed column 100, and is a sealing component 118 and the fixed column 100.
Together with this, it constitutes a magnetic fluid seal.

Reference numeral 136 is a bearing cap member. The bearing cap member 136 includes an annular flat plate portion 136a and an annular protrusion 136 protruding downward from the outer peripheral portion thereof.
b and the fitting protrusion 1 protruding above the annular flat plate portion 136a
It consists of 36c. The fitting protrusion 136c is provided on the rotor hub 10
The outer diameter of the screw hole 112 is slightly larger than the inner diameter of the screw hole 112. The fitting projection 136c fits into the screw hole 112 from its lower opening to close the screw hole 112, and the bearing cap member 136 is attached to the rotor hub 10.
It has the effect of fixing to 4. In this way the screw hole 1
The blockage of 12 prevents dust, cutting chips, and the like from entering the inside of the motor through the screw hole 112.

The inner peripheral portion of the annular flat plate portion 136a is located below the second ball bearing 116 from the outer ring 116a side to the inner ring 11a.
The outer peripheral side of 6b is covered. The lower end surface of the annular protrusion 136b of the bearing cap member 136 is fixed to the rotor hub 10.
4 is in contact with the upper end surface of the cylindrical rotor magnet 138 fixed inside the outer peripheral wall portion 108, and thus the bearing cap member 136 is more reliably fixed to the rotor hub 104. Such a bearing cap member 1
36 makes it possible to fix the bearing cap, which was conventionally fixed using an adhesive, with almost one touch. The material of the bearing cap member 136 is preferably a synthetic resin or the like having elasticity such that the fitting protrusion 136c can be easily fitted and fixed in the screw hole 112.

Reference numeral 140 is a bracket member. The bracket member 140 has a central upper and lower cylindrical portion 142.1.
44, and an annular recess 146 having an upper opening on the outer periphery thereof.
have. In the upper cylindrical portion 142, the stator core 1
48 is externally fitted and fixed, and a stator coil 150 is wound around the stator core 148. The circuit board 152 is mounted on the bottom surface of the annular recess 146, and the bracket member 1
A flexible lead substrate 156 is drawn out through a through hole 154 penetrating through 40. 158 is a through hole 15
4 is a filler for closing 4.

The fixed column 100 is fitted and fixed to the upper and lower cylindrical portions 142 and 144, so that the rotor magnet 138 and the stator core 148 face each other in the radial direction. At the same time, the inner peripheral surface of the annular flat plate portion 136a of the bearing cap member 136 opposes the outer peripheral surface of the upper end portion of the upper cylindrical portion 142 with a slight radial gap therebetween, and the rotor hub 1
04, the outer peripheral surface of the overhang portion 110 and the bracket member 140.
The outer peripheral surface 160 of the annular concave portion 146 of the above is opposed to the outer peripheral surface 160 with a slight radial gap therebetween.
The lubricant of the ball bearing 116 is prevented as much as possible from leaking to the inside of the motor and to the outside of the motor.

The vertical positional relationship in the above description of the embodiments is merely for the convenience of description based on the drawings, and does not limit the actual use state or the like.

[0039]

In the motor device of the present invention, the first component and the second component are arranged so as to be in contact with the peripheral wall portion, and then the ultraviolet curable adhesive is applied once from the side not facing the first component,
After that, by irradiating the ultraviolet ray once from the side not facing the first component, the ultraviolet ray is spread through the cutout into the adhesive, and the adhesive is cured.
Since the parts can be adhered to the peripheral wall portion, the manufacturing efficiency becomes extremely high as compared with the conventional motor device in which the adhesive application and the ultraviolet irradiation have to be performed for each part.

[Brief description of drawings]

FIG. 1 is a half sectional view of a spindle motor for driving a recording medium.

FIG. 2 is a plan view of a seal cap member.

FIG. 3 is a fragmentary perspective view of a main part of a seal cap member.

FIG. 4 is a half cross-sectional view of a spindle motor for driving a recording medium.

FIG. 5 is a sectional view of a main part of a conventional spindle motor device for driving a recording medium.

[Explanation of sign]

 22 Small Inner Diameter Part 54 First Sealing Part 62 Seal Cap Member 62c Projection 64 Adhesive 62d Notch

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuto Miyajima 1145-4 Tagiri, Iijima-cho, Kamiina-gun, Nagano Nagano Nidec Corporation

Claims (1)

[Claims] 1. A peripheral portion of a first component is in contact with a peripheral wall portion of a motor device, and a second component adjacent to the first component is in contact with the peripheral wall portion at a plurality of protrusions provided in the peripheral portion. The ultraviolet-curable adhesive cures in a state where it reaches the first component, the second component, and the peripheral wall portion through the notches provided between the protrusions of the second component, and the first component and the second component. A motor device characterized in that a component and a peripheral wall portion are adhered to each other.