JP3210577B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a video tape
The present invention relates to a motor that can be used as a capstan motor of a recorder (hereinafter, referred to as “VTR”), and particularly to a bearing holder and a structure around the bearing holder.

[0002]

2. Description of the Related Art As a capstan motor for a VTR,
For example, there is a configuration shown in FIG. The motor 1a shown in FIG. 5 includes a stator assembly 2 and a rotor assembly 3. The stator assembly 2 includes a stator substrate 4, a core holder 5 attached to the stator substrate 4, a stator core 6 held by the core holder 5, and a core winding 7 wound around the stator core 6.
It has. The bearing holder 8 is mounted so as to pass through the center of the stator assembly 2. The rotor assembly 3 includes a rotor shaft 9 rotatably supported by sintered oil-impregnated bearings 13 and 14 held by the bearing holder 8, a cup-shaped rotor case 10 concentrically fixed to the rotor shaft 9, A rotor magnet 11 attached to the inner peripheral surface of the rotor case 10.

As shown in FIGS. 6 to 8, the bearing holder 8 has a cylindrical main body 8a and a wide flange 8b formed at one end of the cylindrical main body 8a. The flange 8b is for attachment to the stator assembly 2, and has a screw through hole 8c formed therein. From the flange 8b, three cylindrical projections 8d for mounting screws extend in the axial direction of the cylindrical main body 8a, and these cylindrical projections 8d are formed with screw holes 8e for mounting screws. Have been. In addition, these cylindrical projections 8d
Is connected to the outer peripheral surface of the cylindrical main body 8a. Cylindrical body 8a
Is formed thick from the flange 8b to a position about halfway in the axial direction. Therefore, the outer shape of the cylindrical main body 8a has two steps of a large diameter portion 8f on the base end side and a small diameter portion 8g on the front end side. The tubular main body 8a formed in this way engages with mounting holes formed in the stator substrate and the chassis of various devices, as described later.

[0004] As shown in FIG. 9, the stator substrate 4 has a mounting hole 4 a into which the bearing holder 8 is inserted. The mounting hole 4a has an arc portion 4b of a circular hole into which the cylindrical main body 8a of the bearing holder 8 is inserted, and three cylindrical projections 8d for mounting screws formed around the cylindrical main body 8a. And a notch 4c. A notch 4d into which a positioning pin of the core holder 5 fits is formed at a portion corresponding to a substantially apex of the notch 4c. The bearing holder 8 is inserted into the mounting hole 4a of the stator substrate 4 thus formed up to the large diameter portion 8f of the cylindrical main body 8a. Bearing holder 8
Is by engaging the arcuate portion 4b of the hole 4a fitted with a large-diameter portion 8f, is accurately positioned in the center of the mounting hole 4a of the stator substrate 4.

[0005] The motor 1a thus constructed is connected to a VTR.
When assembling into various devices such as shown in FIG.
The small diameter portion 8g of the cylindrical main body 8a of the bearing holder 8 is inserted into a mounting hole 20a formed in a motor mounting chassis 20 of various devices. The motor 1a is accurately positioned at the center of the mounting hole 20a of the chassis 20 by engaging the small diameter portion 8g of the cylindrical main body 8a with the mounting hole 20a.

[0006]

In the conventional motor 1a, as described above, the large diameter portion 8f formed on the bearing holder 8 is used.
Is a reference for aligning the bearing holder 8 with the center position of the mounting hole 4a of the stator substrate 4, and the small-diameter portion 8g formed in the bearing holder 8 allows the motor 1a to connect the motor 1a to a chassis 20 such as a VTR.
Of the mounting hole 20a formed at the center position. Since the cylindrical main body 8a of the bearing holder 8 has two stages provided with such a large-diameter portion 8f for positioning, the wall thickness is increased and the volume of the bearing holder 8 is increased. As a result, there is a problem that the material cost of the bearing holder 8 is increased and the cost is increased. An object of the present invention is to solve the above problems by positioning the bearing holder at the center of a hole formed in a stator substrate and a chassis of various devices without increasing the thickness of the bearing holder. It is an object of the present invention to provide a motor capable of reducing the volume, cost, and weight of the entire bearing holder.

[0007]

In order to solve the above-mentioned problems, the present invention provides a stator assembly including a stator substrate, and a bearing holder fixed to the stator assembly so as to pass through the center of the stator assembly. A rotor assembly including a motor shaft rotatably supported on the stator assembly via a bearing held by the bearing holder, wherein the bearing holder positions the bearing holder on the stator substrate. And a second positioning portion for positioning the bearing holder on the motor mounting chassis: the first positioning portion and the second positioning portion A projection protruding radially outward from the outer peripheral surface of the cylindrical body holding the bearing, Projection of the positioning portion circumscribed circle than the projection of the first positioning portion is formed so as to be small,
In addition, in the insertion direction when fixing the cylindrical main body to the stator substrate, the cylindrical main body is positioned forward of the first positioning portion.
The projection of the second positioning portion is
Formed at different circumferential positions on the outer peripheral surface of the cylindrical body
It is characterized by including at least three projections .

In the present invention, in order to position the cylindrical body of the bearing holder at the center of the mounting hole of the stator substrate or the mounting hole of the motor mounting chassis, a projection formed on the outer peripheral surface of the cylindrical body is used. I have. For this reason, there is no need to increase the thickness of the cylindrical body itself to form a large-diameter positioning portion. Therefore, the thickness of the cylindrical main body can be reduced as a whole, so that the volume of the bearing holder can be reduced. Further, the cost can be reduced as much as the material cost can be reduced. In addition, the front end face of the projection forming the second positioning portion is tapered in the direction of insertion into the mounting hole of the stator substrate or the chassis, so that the projection is formed on the stator substrate and the chassis. The second positioning portion does not get caught when the cylindrical main body is inserted into the provided mounting hole. Therefore, the cylindrical main body of the bearing holder can be smoothly inserted into the mounting hole.

Further , if the number of the protrusions is four or more, the second
Of the circular mounting hole formed to the circumcircle of the positioning part
If a notch was formed on the circumference, the notch
It is assumed that one protrusion of the second positioning portion is positioned
However, the remaining three projections hit the circumference of the mounting hole.
Therefore, the bearing holder always has three mounting hole circles
Since it hits the periphery, it is accurately positioned.

In the present invention, the second positioning portion is
The constituting projection constitutes the first positioning portion.
Formed at the same angular position as the projection
No.

Further , in the present invention, the bearing
The holder is disposed around the cylindrical main body and the cylindrical main body
A cylindrical projection extending in the axial direction of the cylindrical body,
A rib connecting the projections, and the second positioning portion
Are located at the same angular position as the ribs.
It is preferable to form it. In this way, the projections are concentrated
By providing this, the outer diameter of the bearing holder can be simplified.
Wear.

Next, the present invention provides a stator including a stator substrate.
Through the stator assembly and the center of this stator assembly.
Bearing fixed to the stator assembly in a threaded state
Through the holder and the bearing held by this bearing holder
And rotatably supported with respect to the stator assembly.
Rotor assembly including a motor shaft
And the bearing holder includes the bearing holder and the stator.
A first positioning portion for positioning on a substrate, and the shaft
Position the receiving holder on the motor mounting chassis.
In a motor comprising a second positioning part for:
The bearing holder includes a cylindrical body that holds the bearing,
Is disposed around the cylindrical main body in the axial direction of the cylindrical main body.
A cylindrical projection extending from the main body and the cylindrical projection.
The protrusion is integrally formed;
Fix the bearing holder to the motor mounting chassis
When inserting the cylindrical projection in the insertion direction, and
The motor positioning system is provided by the second positioning portion.
So that the bearing holder is positioned with respect to the chassis.
It is characterized by becoming.

In the present invention, the second positioning portion is
The front end face of each projection in the
It is desirable to be inclined toward the center of the cylindrical main body.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a motor to which the present invention is applied will be described with reference to the drawings. The motor described below has the same basic structure as a conventional motor.
Parts having common functions will be described with the same reference numerals.

FIG. 1 is a longitudinal sectional view showing a motor according to the present invention. As shown in this figure, the motor 1 of the present invention includes a stator assembly 2 and a rotor assembly 3. The stator assembly 2 includes a stator substrate 4
And a core holder 5 attached to the stator substrate 4;
Stator core 6 held by this core holder 5
And a core winding 7 wound around the stator core 6. A bearing holder 12 is mounted with screws (not shown) so as to pass through the center of the stator assembly 2. The rotor assembly 3 includes a rotor shaft 9 rotatably supported by sintered oil-impregnated bearings 13 and 14 held by a bearing holder 12, a cup-shaped rotor case 10 concentrically fixed to the rotor shaft 9, and A rotor magnet 11 attached to the inner peripheral surface of the rotor case 10.

FIG. 2 is a side view of the bearing holder, FIG. 3 is a plan view thereof, and FIG. 4 is a longitudinal sectional view of the bearing holder. As shown in these figures, the bearing holder 12 includes a cylindrical main body 12a,
It has a wide brim flange 12b formed at the base end of the cylindrical main body 12a. The flange 12b is for attachment to the stator assembly 2 side, and has a hexagonal shape as a whole. At the six corners of the flange 12b,
Three screw through holes 12c are formed every other one.
At the remaining three corners, three cylindrical protrusions 12d for mounting screws extend from the surface of the flange 12b in the axial direction of the cylindrical main body 12a, and these cylindrical protrusions 12d are provided with mounting screws. Screw holes 12e are formed. Each cylindrical projection 12d is connected to the side of the cylindrical main body 12a by a rib 12j extending radially from the outer peripheral surface of the cylindrical main body 12a.

The bearing holder 12 further includes a first positioning portion 121 and a second positioning portion 122 described below. The bearing holder 12 includes the first positioning portion 1.
Mounting hole 4a formed in stator substrate 4
To the center position of When the completed motor 1 is incorporated into various devices, the motor 1 is positioned on the motor mounting chassis 20 of the various devices by the second positioning portion 122 formed on the bearing holder 12.

The first positioning portion 121 is provided on the cylindrical main body 12.
On the base end side of a, three first projections 12f protruding outward in the radial direction from the outer peripheral surface of the cylindrical main body 12a. The first projections 12f are arranged at an angular interval of 120 ° and extend in the axial direction of the cylindrical main body 12a. Since the amounts of these first protrusions 12f protruding in the radial direction are the same, the outer peripheral end faces are concentric with the cylindrical main body 12a. Further, the first protrusion 12f is
j and 60 °. Therefore, the first protrusion 12
The f and the ribs 12j are alternately formed on the outer peripheral surface of the cylindrical main body 12a at an angular interval of 60 °.

The second positioning portion 122 is provided on the cylindrical main body 12.
On the distal end side of a, there are six second protrusions 12g protruding radially outward from the outer peripheral surface of the cylindrical main body 12a. The second projections 12g are arranged at an angular interval of 60 ° and extend in the axial direction of the cylindrical main body 12a. These second projections 12g are first projections 12f.
And at the same angular position as the rib 12j and the first projection 12f and the rib 12j in the axial direction. The outer peripheral end face of the second projection 12g is also on the concentric circle of the cylindrical main body 12a. However, the amount of protrusion in the radial direction is smaller than that of the first protrusion 12f. Accordingly, a step is formed between the first projection 12f and the second projection 12g connected in the axial direction, and the first projection 12f on the base end side protrudes. As described above, the second protrusion 12g forming the second positioning portion 122 is formed such that the circumscribed circle becomes smaller in diameter than the first protrusion 12f forming the first positioning portion 121.

Here, the front end face 12i of the second projection 12g constituting the second positioning portion 122 is inserted in the insertion direction A.
And has a tapered surface inclined toward the center of the cylindrical main body 12a.

One of the first projections 12f forming the first positioning portion 121 has a stator substrate 4
A projection 12k for positioning the bearing holder 12 in the circumferential direction with respect to the projection 12k is formed.

The bearing holder 12 thus formed is
Like the conventional capstan motor, it can be attached to the stator substrate 4 shown in FIG. The mounting hole 4a formed in the stator substrate 4 includes an arc portion 4b of a circular hole into which the cylindrical main body 12a of the bearing holder 12 is inserted, and three mounting screw cylinders formed around the cylindrical main body 12a. And a notch 4c into which the projection 12d is inserted. A notch 4d into which the positioning pin of the core holder 3 fits is formed in the outermost peripheral portion of the notch 4c. The protrusion 12 of the bearing holder 12 is provided on the outer peripheral portion of the arc portion 4b.
A notch 4r into which k fits is formed.

The bearing holder 1 is mounted on such a stator substrate 4.
In order to mount 2, the bearing holder 12 is first inserted so that the first projection 12f of the bearing holder 12 fits into the mounting hole 4a of the stator substrate 4, as shown in FIG.

Here, the second positioning portion 12 is located in front of the first projection 12f constituting the first positioning portion 121.
2 are located. The second projection 12g has a circumscribed circle smaller in diameter than the first projection 12f, and the front end face 12i of the second projection 12g is inclined toward the center of the cylindrical main body 12a in the insertion direction A. I have. Therefore, the second projection 12g does not catch on the periphery of the mounting hole 4a.

When the bearing holder 12 is inserted into the mounting hole 4a, the projection 12k is inserted into the circular arc portion 4b shown in FIG.
Is engaged with the notch 4r formed in a part of the
2 is performed in the circumferential direction. In this state, the outer peripheral portion of the first projection 12f constituting the first positioning portion 121 is engaged with the peripheral wall of the arc portion 4b of the mounting hole 4a.
As a result, the cylindrical main body 12a of the bearing holder 12 is positioned at the center of the mounting hole 4a formed in the stator substrate 4.

Thereafter, a screw (not shown) is inserted through the screw through hole 12c of the flange 12b, and the stator core 6
And the core holder 5 and the screw holes 4e of the stator substrate 4 to be joined together.

The motor 1 assembled as described above
Is mounted on a motor mounting chassis 20 of a VTR and other various devices. The second projection 12g constituting the second positioning portion 122 is provided on the chassis 20 of various devices.
A circular mounting hole 20a having a circumscribed circle dimension is formed. Therefore, when the cylindrical main body 12a of the bearing holder 12 is inserted into the mounting hole 20a of the chassis 20, the outer peripheral portion of the second projection 12g engages with the peripheral wall of the mounting hole 20a. As a result, the bearing holder 12 can be positioned with respect to the chassis 20. That is, the motor 1 and the chassis 20
Can be positioned. Also in this case, the second protrusion 12g
Is inclined toward the center of the cylindrical body 12a in the insertion direction A, so that the mounting hole 2
0a can be inserted smoothly without being caught. Moreover,
Since the second projections 12g are formed at six locations, if a notch is formed on the circumference of the mounting hole 20a of the chassis 20, one of the second projections 12g is formed at the notch.
Even if one is located, the other five projections 12g hit the circumference of the mounting hole 20a. Accordingly, since the five points on the outer peripheral portion of the bearing holder 12 hit the circumferential edge of the mounting hole, the motor 1 can be reliably positioned with respect to the chassis 20.

As described above, according to the present invention, the cylindrical main body 12a of the bearing holder 12 is attached to the mounting hole 4a of the stator substrate 4.
The first and second protrusions 12f and 12g formed on the outer peripheral surface of the cylindrical main body 12a are used for positioning the mounting holes 20a of the motor and the motor mounting chassis 20. Therefore, it is not necessary to increase the thickness of the tubular main body itself.

Further, the second positioning part constituting the second positioning part
The front end face 12i of the projection of the
0 is inclined toward the center of the cylindrical body in the insertion direction A into the mounting hole of the cylindrical body 12 of the bearing holder 12.
a can be smoothly inserted into the mounting hole.

Further, the second projection forming the second positioning portion is formed at the same angular position as the first projection and the rib 12j forming the first positioning portion. The shape of the bearing holder 12 is simplified.

When the volume of the bearing holder 12 is reduced in this manner, the material cost of the bearing holder 12 is reduced, and the cost of the bearing holder 12 can be reduced. For example, the weight can be reduced by about 30% as compared with the conventional bearing holder 12, and the volume can be reduced to about 2/3.

As the material of the bearing holder 12, for example, zinc or resin can be used. In the case of zinc, it can be made by die casting, and in the case of resin, it can be made by molding. Further, it can be made by other materials and construction methods, for example, sheet metal processing of a metal plate. The first projections 12f constituting the first positioning portion 121 are not necessarily required to be provided at three places, and may be provided at more places. Further, the number of the second protrusions 12g constituting the second positioning portion 122 is not limited to six, but may be three or more.
If it is, positioning is possible.

The motor 1 according to the present invention is not limited to a capstan motor for a VTR, but can be applied to a motor for other uses. Further, in the above-described embodiment, the peripheral facing type with the core has been described as an example, but the surface facing type may also be used.
A coreless type may be used, and the type of the motor is not limited.

[0034]

As described above, according to the present invention,
The protrusion protruding from the outer peripheral surface of the cylindrical body of the bearing holder allows the bearing holder to be aligned with the center position of the mounting hole formed in the stator substrate and the chassis of various devices. Therefore, it is not necessary to increase the thickness of the cylindrical body itself for positioning.

Further, since the front end face of the second projection constituting the second positioning portion is inclined toward the center of the cylindrical main body in the direction of inserting the bearing holder, the bearing holder can be mounted on the stator substrate. The second projection can be smoothly inserted without being caught by the second projection when it is inserted into a mounting hole formed in a motor mounting chassis of various devices.

Further, the second positioning portion is provided with four or more
If the projections are formed by projections, if a notch is formed on the circumference of a circular mounting hole formed to have a circumscribed circle dimension of these projections, even if one of the projections is located in that notch, the other three Since the two projections hit the inner periphery of the mounting hole,
Accurate positioning can be performed.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a motor to which the present invention is applied.

FIG. 2 is a side view showing a bearing holder used for the motor shown in FIG.

FIG. 3 is a plan view showing the bearing holder of FIG. 2;

FIG. 4 is a longitudinal sectional view showing the bearing holder of FIG. 2;

FIG. 5 is a longitudinal sectional view showing a conventional motor.

FIG. 6 is a side view showing a conventional bearing holder.

FIG. 7 is a plan view showing a conventional bearing holder.

FIG. 8 is a longitudinal sectional view showing a conventional bearing holder.

FIG. 9 is a plan view showing a stator substrate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Stator assembly 3 Rotor assembly 4 Stator board 4a Stator board mounting hole 5 Core holder 6 Stator core 7 Core winding 9 Rotor shaft 10 Rotor case 11 Rotor magnet 12 Bearing holder 12a Cylindrical main body 12b Flange 12d Cylindrical projection 12f First Projection 12g Second projection 12i Front end face of second positioning portion 12j Rib 121 First positioning portion 122 Second positioning portion 13, 14 Bearing 20 Motor mounting chassis 20a for various devices 20a Mounting hole formed in chassis

Claims (5)

(57) [Claims] 1. A stator assembly including a stator substrate, a bearing holder fixed to the stator assembly while penetrating the center of the stator assembly, and a bearing held by the bearing holder. A rotor assembly including a motor shaft rotatably supported with respect to the rotor, wherein the bearing holder has a first positioning portion for positioning the bearing holder on the stator substrate, and the bearing holder has a motor mounting portion. A motor having a second positioning portion for positioning on a chassis, wherein the first positioning portion and the second positioning portion are:
A protrusion protruding radially outward from the outer peripheral surface of the cylindrical body holding the bearing, wherein the protrusion of the second positioning portion is formed such that the circumscribed circle has a smaller diameter than the protrusion of the first positioning portion. And, in the insertion direction when fixing the cylindrical main body to the stator substrate, it is located forward of the first positioning portion, and the projection of the second positioning portion is Outside
Formed at different positions in the circumferential direction on the peripheral surface
The motor further comprises three projections. 2. A stator assembly including a stator substrate.
The stator assembly through the center.
A bearing holder fixed to the stator assembly;
The bearing is held by a bearing holder,
Motor assembly rotatably supported by the motor assembly
A rotor assembly including a shaft.
The damper positions the bearing holder on the stator substrate.
For positioning the bearing holder and a first positioning portion for
Second positioning for positioning on the mounting chassis
The bearing holder comprises: a cylindrical main body for holding the bearing;
Is disposed around the cylindrical main body in the axial direction of the cylindrical main body.
A cylindrical projection extending from the main body and the cylindrical projection.
The protrusion is integrally formed, and is attached to the motor mounting chassis at the cylindrical protrusion.
Insertion of the cylindrical projection when fixing the bearing holder
The front end face in the entry direction and the second positioning portion,
The bearing holder is attached to the motor mounting chassis.
A mode characterized by being positioned
Ta. 3. The front end face of each projection in the second positioning portion according to claim 1 or 2,
The cylindrical body is inclined toward the center in the insertion direction.
Motor characterized by Rukoto. 4. The method according to claim 1, wherein
In at least one of the second positioning portions
The protrusions are the same as the protrusions forming the first positioning portion.
The module is formed at one angular position.
Data. 5. The bearing according to claim 1, 3 or 4, wherein the bearing holder is arranged around the cylindrical main body.
A cylindrical projection extending in the axial direction of the cylindrical body, and the cylindrical body
And a rib connecting the cylindrical projections, and at least one of the second positioning portions is formed.
The projection is formed at the same angular position as the rib.
A motor characterized in that: