JPH08163806A - Motor - Google Patents

Abstract

PURPOSE: To reduce the molding cost of die and the maintenance/management cost of die and bearing holder by sharing the bearing holder while ensuring the degree of freedom in the design. CONSTITUTION: A rotary shaft 16 is held rotatably at a tubular part 12a through bearing members 15, 15 and a flange part 12b is formed tubularly with larger diameter than the tubular part 12a and abutted against a fixing face 12e. Under that state, the bearing holder 12 is fixed to a mechanical chassis 20 through an annular groove 12f made in the fixing face 12e.

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 bearing holder such as a VTR capstan motor.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 4, a bearing holder 2 is fixed to a base 1, and a stator core 3 having a coil 3a wound around a flange 2a of the bearing holder 2 is fixed via a screw 4 to a bearing. The rotary shaft 6 is connected to the bearing holder 2 via
There is known a brushless motor m that is rotatably held by a cylindrical portion 2b of the rotor, and has a rotor 7 facing the stator core 3 fixed to a rotating shaft 6 via a boss 8 ′ provided with a pulley 8 (for example, Japanese Patent Laid-Open No. Hei 10 (1999) -242242). (See Japanese Patent Publication No. 5-191958).

As shown in FIG. 5, the flange portion 2a of the bearing holder 2 has a disk-shaped collar portion 2c and a plurality of leg portions 2d protruding upward so as to extend radially from the center of the collar portion 2c. , 2d ... In addition, the collar portion 2c and the leg portion 2
Screw holes 2e, 2e ..., 2f, 2f ... Are formed in d.

The screw holes 2c, 2c ... Are used, for example, when fixing the stator core 3 to the bearing holder 2 with the screw 4. Further, the screw holes 2f, 2f ... Are used when fixing the brushless motor m to the mechanical chassis 10 via the screw 9.

That is, the upper surfaces of the legs 2d, 2d ...
The mechanical chassis 10 is brought into contact with the mounting surfaces 2g, 2g ... As g, 2g, and the screw insertion holes 10b are formed apart from the cylinder insertion hole 10a formed in the mechanical chassis 10.
10b ... and screw holes 2f, 2f ... In the same state, screws 9 are inserted from screw insertion holes 10b, 10b ... and screwed into screw holes 2f, 2f. 2 is fixed integrally with the entire brushless motor m.

[0006]

By the way, in such a brushless motor m, the bearing holder 2 is formed or the shape of the bearing holder 2 is formed depending on the positions where the screw insertion holes 10b, 10b ... Of the mechanical chassis 10 are formed. The degree of freedom in designing the bearing holder 2 is narrow, such as the need to determine the formation positions of the screw insertion holes 10b, 10b ... According to the specifications, the number of types increases by forming the bearing holder 2 according to the specifications. However, there has been a problem that the molding cost of the mold and the maintenance cost of the mold and the bearing holder 2 increase.

In view of the above situation, the present invention can secure the degree of freedom in design and reduce the molding cost of the mold and the maintenance cost of the mold and the bearing holder by sharing the bearing holder. An object is to provide a motor that can perform.

[0008]

In order to achieve the object, the invention described in claim 1 has a cylindrical portion for rotatably holding a rotary shaft through a bearing member, and a mounting surface for mounting on a mechanical chassis. In a motor having a bearing holder including a flange portion having the flange portion, the flange portion is formed in a cylindrical shape having a larger diameter than the cylindrical portion, and an annular groove is formed in the mounting surface. It is what

[0009]

In the structure described in claim 1, the rotary shaft is rotatably held in the cylindrical portion through the bearing member, and the flange portion is formed in a cylindrical shape having a diameter larger than that of the cylindrical portion. An annular groove is formed on the mounting surface so that the bearing holder can be mounted on the mechanical chassis in a state of being in contact with the mounting surface.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the motor of the present invention will be applied to a brushless motor and will be described with reference to FIGS.

In FIG. 1, M is a brushless motor such as a capstan motor for a VTR. This brushless motor M includes a base 11, a bearing holder 12 fixed to the base 11, and a stator core 14 around which a coil 13 is wound.
And a rotary shaft 16 rotatably held in the bearing holder 12 via the sintered oil-impregnated bearings 15, 15 and fixed to the rotary shaft 16 via a boss 17 'equipped with a pulley 17 and opposed to the stator core 14. A rotor 18 having a drive magnet (not shown) and a spacer 19 located between the substrate 11 and the stator core 14 are provided.

As shown in FIGS. 2A and 2B, the bearing holder 12 has a cylindrical portion 12a for rotatably holding the rotating shaft 16 and a flange portion 12b formed integrally with the cylindrical portion 12a. It has and. Also, the flange portion 12b
Is a base 1 having a cylindrical shape with a diameter larger than that of the cylindrical portion 12a.
2c and a flange 12d formed integrally with the base 12c.

The upper surface of the base 12c is in contact with the mechanical chassis 20 for fixing the brushless motor M.
Has become. An annular groove 12f is formed on the contact surface 12e of the base 12c so as to be coaxial with the cylindrical portion 12a and extend over the entire circumference. Further, holes 12g, 12g are formed at a plurality of predetermined positions (for example, trisecting positions) of the collar portion 12d. The collar 12d has holes 12g and 12g.
You may make it protrude only radially in the part which has.

On the other hand, the mechanical chassis 20 has a cylindrical portion 12
a tube insertion hole 20a into which a is inserted, and this tube insertion hole 20a
The plurality of screw insertion holes 20b, 20b, which are located on the locus of the concentric circle with the annular groove 12f when the cylindrical portion 12a is inserted into
Have and. The intervals and the number of the screw insertion holes 20b, 20b ... Are, for example, the trisection points shown in FIG.
It is not particularly limited as long as it is located on the locus of the concentric circle with the annular groove 12f, such as the four equal points shown in (B) and the irregular even points shown in FIG. 3 (C).

In the above structure, the brushless motor M
Is a state where the stator core 14 around which the coil 13 is wound is fixed to the flange portion 12b, and the screw 21 is inserted into the holes 12g and 12g.
And the bearing holder 12 is fixed to the substrate 11 together with the stator core 14.

Next, after the rotary shaft 16 is rotatably held by the cylindrical portion 12a via the sintered oil-impregnated bearings 15, 15, the boss 17 'equipped with the pulley 17 fitted to the rotor 18 is mounted on the rotary shaft. The brushless motor M is attached to the connector 16 and assembled.

The brushless motor M assembled in this manner has a cylinder insertion hole 2 formed in the mechanical chassis 20.
0a is inserted into the cylindrical portion 12a so that the contact surface 12e is brought into contact with the mechanical chassis 20, and the screw insertion holes 20b formed in the mechanical chassis 20 are aligned with the annular groove 12f. It is possible to fix the mechanical chassis 20 by inserting a screw 22 into the insertion holes 20b, 20b ... And screwing the screw 22 into the annular groove 12.

The material of the bearing holder 12 is not particularly limited, such as metal such as aluminum die casting or zinc die casting, or resin, but by using a self-tapping screw as the screw 22, an annular groove 12f can be obtained. The screw 22 can be screwed while the thread groove is formed on the inner wall surface of the. In addition to this, if the bearing holder 12 is formed of resin or the inner wall surface of the annular groove 12f is coated with resin, a thread groove is formed on the inner wall surface of the annular groove 12f even if a very general screw is used. It is possible to screw the screw 22 while forming the.

Then, the rotor 18 rotates integrally with the rotary shaft 16 by the current flowing through the coil 13 and the magnetic force of the drive magnet of the rotor 18, and the rotation of the rotary shaft 16 causes the pulley 17 to rotate.

Thus, the brushless motor M of the present invention
Is screw 2 when fixing it to the mechanical chassis 20 with screw 22.
Since the hole into which 2 is screwed is the annular groove 12f, the mounting position is not limited even when the brushless motor M is rotated within the mounting plane of the mechanical chassis 20 with the cylindrical portion 12a as an axis. The directionality of sticking is improved, and the bearing holder 12 can be shared.

Further, as long as the positions of the screw insertion holes 20b, 20b ... Formed in the mechanical chassis 20 are on concentric loci, there is no particular limitation, and the versatility of the mechanical chassis 20 is high. The degree of freedom in the design of the chassis 20 and the degree of freedom in the design of the bearing holder 12 can be significantly increased as compared with the conventional type in which the holes are aligned.

[0022]

As described above, in the motor of the present invention, the flange portion is formed in a cylindrical shape having a diameter larger than that of the cylindrical portion, and the mounting surface is formed with an annular groove. By doing so, it is possible to secure the degree of freedom in design, and by sharing the bearing holder, it is possible to reduce the molding cost of the mold and the maintenance management cost of the mold and the bearing holder.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a brushless motor showing a motor of the present invention.

[FIG. 2] Similarly, (A) is a plan view of the bearing holder, and (B) is
FIG. 4 is a vertical cross-sectional view of a main part.

3A to 3C are plan views of mechanical chassis of different types.

FIG. 4 is a vertical cross-sectional view of a brushless motor showing a conventional motor.

5 (A) is a plan view of a bearing holder used in a conventional motor, FIG. 5 (B) is a plan view of a mechanical chassis, and FIG. 5 (C) is a vertical cross-sectional view of a main part.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Brushless motor 12 ... Bearing holder 12a ... Cylindrical part 12b ... Flange part 12e ... Abutting surface 12f ... Annular groove 15 ... Sintered oil-impregnated bearing 16 ... Rotating shaft 20 ... Mechanical chassis

Claims (3)

[Claims] 1. A motor having a bearing holder having a cylindrical portion for rotatably holding a rotating shaft via a bearing member and a flange portion having a mounting surface for mounting to a mechanical chassis, wherein the flange portion is the cylindrical portion. The motor is characterized in that it is formed in a cylindrical shape having a diameter larger than that of the portion, and an annular groove is formed in the mounting surface. 2. The mechanical chassis is brought into contact with the mounting surface in a state where the mounting hole formed in the mechanical chassis and the annular groove are aligned with each other, and the fastening member inserted through the mounting hole is the annular ring. A screw is screwed into the groove.
The motor described in. 3. The motor according to claim 2, wherein the fastening member is a self-tapping screw that is screwed while forming a thread groove on the inner wall surface of the annular groove.