JPH10146003A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor having a motor housing to which pins for guiding the housing are easily installed. SOLUTION: This motor is provided with a motor housing 52, a rotor 54 having a rotor body 74 and a rotor magnet 78 mounted on it, a stator 86 opposed to the rotor magnet 78 and pins for guiding the motor housing 52 in a given direction. The motor housing 52 is made up of a metal housing body 56 and a synthetic resin ring 58 and the pins 96 are formed integrally with the ring 58 with synthetic resin. The ring 59 including the pins 96 is mounted on the housing body 56.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a pin for guiding a motor housing in a predetermined direction.

[0002]

2. Description of the Related Art As a spindle motor used in a removable magnetic disk drive, for example, one having a structure shown in FIG. 4 is known. The motor shown in FIG.
It has a motor housing 2 and a rotor 4 rotated with respect to the motor housing 2. The housing 2 has a circular main body 6, an outer peripheral wall 8 provided on an outer peripheral part of the main body 6, and an inner peripheral wall 10 provided on an inner peripheral part of the main body 6. On the inner peripheral surface of the inner peripheral wall 10, a pair of bearings 12,
The shaft member 16 is rotatably supported via a shaft 14, and the rotor 4 is mounted on one end of the shaft member 16 via a sleeve member 18. The rotor 4 has a cup-shaped rotor body 20.
A rotor magnet 22 is mounted on the inner peripheral surface of the rotor body 20, and a clamp magnet 24 is mounted on an upper end wall of the rotor body 20. The magnetic disk on which information is recorded is magnetically attracted to the clamp magnet 24 and is rotated integrally with the rotor 4 in a predetermined direction. A stator 26 is disposed facing the rotor magnet 22, and the stator 26 is attached to the inner peripheral wall 10 of the housing 2.
Mounted on

The above-described motor is mounted on a magnetic disk drive so as to be movable between a recording position and a non-recording position in connection with mounting and detaching of a magnetic disk which is removably mounted. In connection with the motor being assembled in this manner, a plurality of (for example, three) pins 28 are provided on the outer peripheral wall 8 of the motor housing 2 at circumferentially spaced intervals. The pin 28 is inserted into a slit (not shown) of a guide mechanism provided on the magnetic disk drive, and cooperates with the slit between the motor housing 2 and thus the motor between the recording position and the non-recording position. And prevent relative rotation of the motor housing 2 with respect to the guide mechanism.

[0004]

However, this type of conventional motor has the following problems to be solved. That is, in the conventional motor, the motor housing 2 is formed of aluminum or an alloy thereof, and the pin 28 is formed of stainless steel or iron. The pin 28 is fixed by forming a mounting hole in a predetermined portion of the housing 2 and press-fitting the pin 28 corresponding to the mounting hole. Therefore, the work for fixing the pin 28 is complicated, and it takes time for the work, and there has been a demand for improvement in workability. In addition, since the pin 28 is vertically pressed into the annular outer peripheral wall 8 of the housing 2, the operation requires skill, and from this point, improvement of workability has been desired.

[0005] It is an object of the present invention to provide a motor in which pins for guiding the motor housing can be easily provided in the housing.

[0006]

SUMMARY OF THE INVENTION The present invention provides a rotor having a motor housing, a rotor body and a rotor magnet mounted on the rotor, the rotor being rotatable relative to the motor housing, and In a motor having a stator disposed to face and a plurality of pins for guiding the motor housing in a predetermined direction, the motor housing is mounted on a metal housing main body and the housing main body. The motor is characterized in that the plurality of pins are formed by integral molding of the ring and a synthetic resin.

According to such a motor, the plurality of pins can be formed easily by integrally forming the ring and the synthetic resin. Also, a plurality of pins can be simultaneously attached to the housing body simply by attaching the ring to the housing body.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a motor according to the present invention will be described below with reference to FIGS. In this embodiment, a description will be given by applying the present invention to a spindle motor for a removable magnetic disk drive that rotationally drives a magnetic disk that is detachably mounted.

Referring to FIG. 1, the illustrated motor includes a motor housing 52 and a rotor 54 that is rotatable relative to the motor housing 52. The motor housing 52 includes a housing main body 56 and a ring 58 mounted on the housing main body 56. The housing main body 56 is formed of aluminum or an alloy thereof or iron or a material containing iron as a main component, that is, a metal material, and the ring 58 is formed of a synthetic resin material as described later. The housing body 56
It has a circular main body portion 60, and an outer peripheral wall 62 is provided on the outer peripheral portion of the main body portion 60 so as to cover the periphery of the rotor 54. A circular hole is formed in the center of the main body 60, and an outer peripheral wall 62 is formed in the inner peripheral of the main body 60.
An inner peripheral wall 64 extending concentrically with the inner peripheral wall 64 is provided. Detailed configurations of the housing body 56 and the ring 58 will be described later.

A shaft member 70 is rotatably supported on an inner peripheral surface of an inner peripheral wall 64 of the housing body 56 via a pair of bearings 66 and 68. One end of the shaft member 70 protrudes upward from one of the bearings 66, and the rotor 54 is mounted on the protruding end via a sleeve member 72. The rotor 54 includes a cup-shaped rotor body 74. The rotor main body 74 is formed of a magnetic material such as iron, and has a circular upper end wall 75 fixed to the sleeve member 72, and a peripheral wall extending from the outer peripheral portion of the upper end wall 75 along the outer peripheral wall 62 of the housing main body 56. 76. Rotor body 74
An annular rotor magnet 78 is provided on the inner peripheral surface of the peripheral wall portion 76.
Is installed. The upper end wall 7 of the rotor body 74
5 is provided with an annular positioning projection 80 protruding upward, a disk mounting ring 82 is disposed inside the positioning projection 80, and a thin annular clamp magnet 84 is disposed further inside the ring 82. The disk mounting ring 82 and the clamp magnet 84 are mounted on the upper end wall 7.
5 is fixed by an adhesive or the like. When the magnetic disk (not shown) is detachably mounted on the magnetic disk drive, the magnetic disk is attracted toward the upper end wall 75 of the rotor body 74 by the magnetic action of the clamp magnet 84, and the upper surface of the disk mounting ring 82. And is driven to rotate integrally with the rotor body 74 in a predetermined direction.

A stator 86 is provided inside the rotor magnet 78 so as to face the rotor magnet 78. The stator 86 includes a stator core 88 and a coil 90 wound around the stator core 88 as required. The stator core 88 is fixed to the outer peripheral surface of the inner peripheral wall 64 of the housing body 56. Therefore, the rotor 54 is driven to rotate in a predetermined direction by a mutual magnetic action between the stator 86 and the rotor magnet 78 generated by supplying a required current to the coil 90.

The above-described motor is mounted on a magnetic disk drive so that the entire motor can be freely moved between a recording position and a non-recording position in connection with mounting and detaching of a magnetic disk which is removably mounted. More specifically, a hollow cylindrical guide wall 92 is provided on the drive device side. The inner diameter of the guide wall 92 is slightly larger than the outer diameter of the motor housing 52, that is, the outer diameter of the ring 58, and guides the motor housing 52 along the inner peripheral surface of the guide wall 92. Guide wall 9
1, two guide slits 94 are provided in the guide wall 92 in the moving direction of the motor, in this embodiment, three guide slits 94 extending in the circumferential direction at substantially equal intervals in the circumferential direction. (Only one is shown in FIG. 1). On the other hand, the motor housing 52 is provided with three pins 96 corresponding to each slit 94 of the guide wall 92 (see FIG. 2), and these pins 96 are received in the corresponding guide slits 94. The diameter of the pin 96 is slightly smaller than the width of the guide slit 94,
4 can be moved along.

With such a structure, when no magnetic disk (not shown) is mounted, the pins 96 of the motor housing 52 are located at the lower ends of the corresponding guide slits 94, thereby the entire motor Figure 1
(In this position, the magnetic disk is separated from the disk mounting ring 82). When the magnetic disk is removably mounted, the motor housing 52 is moved upward in FIG. 1 via an interlocking mechanism (not shown) in conjunction with the movement of the magnetic disk in the mounting direction. Are positioned at the recording position (in this position, the magnetic disk is mounted on the disk mounting ring 82) located at the upper end of the guide slit 94.

Next, a configuration related to the pin 96 for moving the entire motor will be described. Referring to FIGS. 2 and 3 together with FIG. 1, the ring 58 includes an annular ring body 98. The three pins 96 are arranged at substantially equal intervals in the circumferential direction on the outer peripheral surface of the ring main body 98 (in the embodiment, 1 pin).
(At intervals of 20 degrees). Each pin 96
Project radially outward from the ring body 98.
In the present embodiment, one of the three pins 96 (the one located on the left side in FIG. 2) is set to be longer than the other two pins, and the specific pin 96 having a longer length is used. Is
It has a function of guiding the motor housing 52 along the slit 94 and preventing relative rotation of the entire motor with respect to the guide wall 92. On the other hand, the remaining two pins 96 only function to guide the motor housing 52 along the slit 94.

The ring body 98 has a positioning projection 100 projecting upward from an upper end thereof corresponding to each pin 96.
Is provided. The positioning projections 100 are rectangular, and their flat upper end surfaces define the same abutment surface extending substantially horizontally. At a portion of the ring main body 98 between the adjacent positioning projections 100, an engagement claw 102 projecting inward in the radial direction is provided, and the engagement claw 102 extends in the circumferential direction between the adjacent positioning projections 100. Extends to. The positioning protrusion 100 and the engagement claw 102
6 together with the ring body 98 by integral molding of synthetic resin. Therefore, the pin 96, the positioning protrusion 100 and the engaging claw 102 can be easily formed, and the positioning protrusion 100 and the engaging claw 102 can be easily formed.
Can have some elasticity. In the present embodiment, three pins 96 are provided on the ring main body 98 at intervals in the circumferential direction. However, the present invention is not limited to this, and four or more pins 96 can be provided at intervals in the circumferential direction. Even when four or more positioning projections 1 are provided,
00 is preferably provided.

On the other hand, as shown in FIG. 1, an annular flange 104 projecting outward in the radial direction is provided at the upper end of the housing body 56. Also, the housing body 56
The annular concave portion 106 is provided on the outer peripheral surface of the
Is provided.

The above-described ring 58 is mounted on the housing body 56 as follows. That is, ring 5
8 is mounted by fitting the housing body 56 from below. Ring 58 into housing body 5
6, the engagement claw 102 of the ring main body 98 engages with the annular concave portion 106 of the housing main body 56 in a state of being somewhat elastically deformed, as shown in FIG. This prevents the ring 58 from being detached from the housing body 56. Also, if you put it on,
Due to the elastic deformation of the engaging claw 102, each positioning protrusion 10
0 is elastically pressed against the flange 104 of the housing body 56, and each pin 96 is accurately positioned at a predetermined position with reference to the lower surface of the flange 104. In the present embodiment, since the positioning protrusion 100 is pressed against the flange 104, a vertical load acts on each pin 96, and in particular, a load that moves the ring body 98 relatively upward with respect to the housing body 56 acts. However, the positioning projection 10
By 0, the elastic deformation of the ring main body 98 is prevented, and each pin 96 is held at a predetermined position without being displaced.

In this embodiment, a thick portion 108 is provided at a portion corresponding to the pin 96 in order to more reliably prevent the pin 96 from being displaced. The thick portion 108 has a rectangular shape in which a pin 96 is disposed at a substantially central portion thereof.
A positioning protrusion 100 extends upward from the upper end of the reference numeral 08. The radial thickness of each thick portion 108 is thicker than the other portions, and by increasing the thickness,
By increasing the strength of the portion near the pin 96, the ring body 98
This prevents elastic deformation due to the load. The housing body 5 corresponds to the thick portion 108 of the ring body 98.
6 is provided at a predetermined position on the outer peripheral surface of the outer peripheral wall 62, and a rectangular accommodating concave portion 110 is provided. The thick portion 108 of the ring body 98 is accommodated in the corresponding accommodating concave portion 110, whereby the motor housing 52 The size in the radial direction can be reduced. In addition, the thick portion 108 is
0, the housing body 56 and the ring 58
Are in the engaged state, and the relative movement of the two is prevented.

In the motor as described above, a plurality of pins 96 can be provided on the motor housing 52 by mounting the ring 58 on the housing body 56, and the pins 96 can be provided relatively easily and easily. it can. In addition, the operation of attaching the ring 58 to the motor housing 52 is easy, and the operation can be easily performed without requiring any skill in the operation.

Although the embodiment of the motor according to the present invention has been described above, the present invention is not limited to this embodiment, and various modifications and corrections can be made without departing from the scope of the present invention.

For example, in this embodiment, the flange 104 against which the positioning projection 100 is pressed is connected to the housing body 5.
6 is provided annularly on the outer peripheral wall 62, but need not be annular, and may be provided corresponding to each positioning projection 100. Further, in the embodiment, the concave portion 106 with which the engaging claw 102 is engaged is also provided in the outer peripheral wall 62 in an annular shape, but this may be provided corresponding to the engaging claw 102.

In the present embodiment, the positioning projection 10
Although 0 is provided corresponding to each pin 96, it is not limited to this, and it may be provided at the upper end of the ring main body 98 in an annular shape corresponding to the flange 104. In this case, the engagement claws 102 can be provided substantially continuously on the inner peripheral surface of the positioning projection 100 or at intervals in the circumferential direction, for example.

In this embodiment, the present invention is applied to a spindle motor for a removable magnetic disk drive. However, the present invention is not limited to this type of motor.
The present invention can be widely applied to a motor which is moved between a non-recording position and a recording position in conjunction with a mounting operation of a recording disk which is removably mounted.

[0024]

According to the motor of the first aspect of the present invention, the plurality of pins can be easily formed because they are formed by integral molding of the ring mounted on the housing body and the synthetic resin. Further, only by attaching the ring to the housing main body, a plurality of pins can be simultaneously attached to the housing main body, and the operation for providing the pins is simple and easy.

According to the motor of claim 2 of the present invention,
When the ring is mounted on the housing main body, the engagement claw of the ring main body is engaged with the annular concave portion of the housing main body, so that the ring main body is prevented from being detached from the housing main body. In addition, since a positioning projection is provided corresponding to each pin so as to be pressed against the annular flange of the housing body, even when a load is applied to the pin, the displacement of the pin is suppressed, and furthermore, each pin is positioned with respect to the surface of the flange. The positions of the pins are determined and each pin is held exactly in place.

Further, according to the motor of the third aspect of the present invention, since the ring body is provided with the thick portion corresponding to each pin, the strength at the portion where the pin is provided increases, and Can be further prevented. Also,
Since the housing recess for housing the thick part is provided, the radial size of the motor housing can be suppressed,
Further, relative rotation between the housing body and the ring body is also prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment in which a motor according to the present invention is applied to a spindle molding for a magnetic disk drive.

FIG. 2 is a plan view showing a ring in the motor of FIG.

1. FIG. 3 is a partially enlarged perspective view showing a part of the ring of FIG.

FIG. 4 is a sectional view showing an example of a conventional motor.

[Explanation of symbols]

 2,52 Motor housing 4,54 Rotor 8,62 Outer peripheral wall 12,14,66,68 Bearing 20,74 Rotor body 22,78 Rotor magnet 24,84 Clamp magnet 26,86 Stator 28,96 pin 56 Housing body 58 Ring 92 guide wall 98 ring main body 100 positioning projection 102 engaging claw 104 flange 106 annular recess 108 thick part

Claims (3)

[Claims] A rotor having a motor housing, a rotor body and a rotor magnet mounted on the rotor body, the rotor being rotatable relative to the motor housing;
In a motor comprising: a stator disposed to face the rotor magnet; and a plurality of pins for guiding the motor housing in a predetermined direction, the motor housing includes a metal housing main body,
A motor comprising a ring mounted on the housing body, wherein the plurality of pins are formed by integral molding of the ring and a synthetic resin. 2. An annular flange protruding outward in the radial direction is provided at an upper end portion of the housing body, and an annular concave portion is provided below the annular flange. A ring main body attached to the housing main body, wherein the ring main body is provided with a positioning protrusion protruding upward corresponding to each of the plurality of pins, and an adjacent positioning protrusion is provided. An engaging claw projecting inward in the radial direction is provided therebetween, and the positioning protrusion contacts the flange, and the engaging claw engages with the annular concave portion. The motor according to 1. 3. The ring body is provided with a thick portion having a large thickness in a radial direction corresponding to each of the plurality of pins, while the housing body is provided with the thick portion. The motor according to claim 2, wherein a housing recess for housing the motor is provided.