JP3044449B2 - Bearing device and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing device comprising a bearing holder and a bearing used for a brushless motor such as a capstan motor for a VTR, and a method of manufacturing the same.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 10, a bearing holder 2 is fixed to a substrate 1 on which a circuit control element and the like are provided, and a stator core 4 wound with a coil 3 is fixed to a flange 2a of the bearing holder 2. The rotor 7 is rotatably held by the cylindrical portion 2 b of the bearing holder 2 via the metal bearings 5 and 5, and has a rotor magnet facing the stator core 4.
Is fixed to one end 6a of the rotating shaft 6, and at the tip of the one end 6a,
There is known a brushless motor M to which a pulley 8 for using the driving force of the motor for other purposes in belt connection is fixed (for example, see Japanese Utility Model Laid-Open No. 3-69319).

As shown in FIG. 11, a plurality of screw holes 2c are formed in the flange 2a of the bearing holder 2. These screw holes 2c, 2c allow the stator core 4 to be screwed 9
Or the brushless motor M
This is for fixing itself to a frame such as a tape recorder. The cylindrical portion 2b of the bearing holder 2 is provided with a window 2d for applying a lateral pressure load to the rotating shaft 6 with a load means such as a pinch roller R for driving the tape facing the outside. And such a bearing holder 2 is
It is integrally molded by die molding such as resin or zinc die casting.

[0004]

However, when the bearing holder 2 is formed by molding such a resin or a die of zinc die casting, it takes time for a manufacturing process such as a molding time, and moreover, a large number of parts are required. Since the mold becomes complicated due to the necessity of removing, etc., not only does the production cost rise, but also the maintenance efficiency of the mold by multi-cavity is complicated, resulting in poor production efficiency. ing. Further, when high accuracy is required with respect to the mounting accuracy of the bearing holder 2, lace processing (cutting processing) in a post-process is required, which further increases costs and lowers production efficiency.

In view of the above circumstances, an object of the present invention is to provide a bearing device which can be manufactured at low cost and with high accuracy by realizing an improvement in the productivity of the bearing holder, and a method of manufacturing the same. It is.

[0006]

According to a first aspect of the present invention, there is provided a method of manufacturing a bearing device, comprising: punching a flat metal plate into a predetermined shape; Are formed in the same direction and parallel to form a bearing holder body having a substantially U-shaped cross section, a pair of cylindrical holes are formed coaxially at both ends, and a rotating shaft is rotatably held in each of the cylindrical holes.
A pillar that fixes the bearing and connects both ends of the bearing holder body
Part into an arc shape in the direction intersecting with the axis of the rotating shaft.
Has formed. According to the second aspect of the present invention, after a single flat metal plate is punched into a predetermined shape, both end portions of the plate are bent in the same direction and in parallel to form a bearing holder having a substantially U-shaped cross section. The main body is formed, a pair of cylindrical holes are formed coaxially at both ends, and a bearing for rotatably holding a rotating shaft is fixed to each cylindrical hole, and a pair of cylindrical holes are formed on opposite surfaces of both ends. Punching is performed simultaneously while being supported by a die inserted between both ends so as to make close contact. In addition, in the invention according to claim 3 , in the method for manufacturing a bearing device according to claim 2 ,
A pair of cylindrical holes are punched out by one punch.
Further, in the invention according to claim 4 , after punching a metal plate material as a single flat plate into a predetermined shape, both ends of the plate material are bent in the same direction and in parallel, and the bearing holder has a substantially U-shaped cross section. Forming the main body, forming a pair of cylindrical holes coaxially at both ends,
A bearing for rotatably holding a rotating shaft is fixed to each of the cylindrical holes, and a cylindrical portion having a cylindrical hole is provided on at least one of both ends, and the cylindrical portion is formed along the axial direction of the rotating shaft, It is formed coaxially with the cylindrical hole by burring.

According to a fifth aspect of the present invention, there is provided a method of manufacturing a bearing device, comprising: a step of forming a bearing holder for forming a bearing holder; and a step of fixing a bearing for rotatably holding a rotating shaft to a cylindrical hole of the bearing holder. A bearing holder forming step, from a single flat metal plate, a base portion serving as a mounting portion for the bearing holder and serving as a support portion supporting one side of the bearing;
A step of punching a bearing holder body material having a bearing support for supporting the bearing on the other side, and a column connecting the base and the bearing support, and forming the base and the bearing support on the column. Bending in the same direction and in parallel to each other, and forming a cylindrical hole for holding the bearing so as to be coaxial with each of the base and the bearing support. In the step of punching, while simultaneously forming a mounting hole to the substrate to which the bearing holder is mounted on the base, in the step of bending the base and the bearing support,
The base and the bearing support are bent at right angles to the support.

[0008] In the invention according to claim 6 , the invention according to claim 6
5. In the method for manufacturing a bearing device according to item 5, the step of punching out the material for the bearing holder body is a step of forming a plurality of bearing holder body materials connected to each other by a connecting portion as an original plate from one piece of metal. There is a step of cutting the connecting portion after the step of bending and the step of forming the cylindrical hole.

In addition, according to the invention of claim 7,
5. The method of manufacturing a bearing device according to item 5, wherein the support portion is a rotating shaft.
Has a reinforcing shape extending in the axial direction. Claims
The invention according to claim 8 provides a method for manufacturing a bearing device according to claim 7.
In this case, the reinforcing shape of the support
The cross section has a curved shape .

[0010] The invention according to claim 9 is the invention according to claim 5.
In the manufacturing method of the bearing device described in the above,
Circle protruding in the axial direction of the rotating shaft formed by machining
It is formed in a cylindrical part .

[0011] Further, the invention according to claim 10 is a base that serves as a mounting part for a bearing holder and also serves as a support part for supporting one bearing, a bearing support part for supporting the other bearing, and a base. And a supporting portion that connects between the bearing support portion, and the base portion and the bearing support portion have a pair of cylindrical holes coaxially, the base portion and the bearing support portion form a single metal plate A bearing holder formed by being bent in parallel from the support portion, and a bearing fixed to the cylindrical hole and rotatably holding the rotary shaft, the pair of cylindrical holes are provided at least in the axial direction of the rotary shaft formed by burring. It is formed in a cylindrical portion that protrudes.

In the present invention, the bearing holder 12 is a metal plate (not shown) which is a single flat plate made of any one of iron-based, copper-based, and aluminum-based metals having a predetermined thickness. Fig. 2
As shown in (A), a plate material 12 ′ serving as a material for a bearing holder body having a predetermined shape is formed. At this time, one end corresponding to the base 12a has a plurality of mounting holes 12b, 12b.
Are simultaneously punched and formed.

Next, as shown in FIG. 3, both ends of the plate member 12 'are bent in the same direction and parallel by a press working machine, and the base 12a, the bearing support 12c, the base 12a and the bearing support A bearing holder body 12 ″ is formed as an original shape of the bearing holder 12 having a substantially U-shaped cross section, which is composed of a support portion 12 d and a support portion 12 d between the support portion 12 c and the support portion. Good to bend.

Further, as shown in FIG.
As shown in FIG. 5, a pair of cylindrical holes 12e, 12e are formed coaxially so that substantially the centers of the base 12a and the bearing support 12c are punched out at the same time.
Is completed. Then, the sintered oil-impregnated bearings 15, 15 serving as bearings are fixed to the cylindrical holes 12e, 12e by press-fitting, and the bearing device is completed.

Incidentally, the bearing holder 12 is shown in FIG.
As shown in (1), a metal plate having a predetermined thickness may be punched out and temporarily have a plurality of plate members 12 ′, 12 ′...

As shown in FIG. 6, in the bearing holder body 12 ", the column 12d may be formed in an arc shape to secure the rigidity. In order to increase the rigidity of the column 12d as described above. It is also effective to provide not only a pure arc shape as described above, but also a bending reinforcing portion or a reinforcing rib which is bent so that a cross section extending in the axial direction has a substantially U-shape. As shown in FIG. 8, the cylindrical portion 12f may be formed coaxially with the cylindrical hole 12e to have the same diameter by burring or the like.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a bearing device and a method of manufacturing the same according to an embodiment of the present invention will be described with reference to FIGS.

In FIG. 1, a brushless motor 10 used for a VTR capstan motor or the like includes a board 11 on which circuit element control and the like of the motor 10 are arranged, a bearing holder 12 fixed to the board 11, A stator core 13 fixed to a base 12 a of the bearing holder 12, a coil 14 wound around the stator core 13, and a rotary shaft 16 rotatably held by the bearing holder 12 via sintered oil-impregnated bearings 15, 15. And a rotor 17 fixed to one end 16a of the rotating shaft 16 so as to face the stator core 13.
And a pulley 18 fixed to the end of one end 16a. Note that, instead of the sintered oil-impregnated bearings 15, 15, other bearings such as ball bearings may be used.

The bearing holder 12 is formed by pressing a metal plate (not shown), which is a single flat plate made of any one of iron-based, copper-based, and aluminum-based metals having a predetermined thickness. As shown in FIG. 2 (A),
A plate material 12 'which is a material for a bearing holder body having a predetermined shape is formed. At this time, a plurality of mounting holes 12b, 12b are simultaneously punched and formed at one end corresponding to the base 12a. The mounting holes 12b, 12b are
3 is for fixing the brushless motor 3 to the bearing holder 12 with the screw 20 or for fixing the brushless motor 10 itself to a frame of a tape recorder (not shown).

Next, as shown in FIG. 3, both ends of the plate 12 'are bent in the same direction and parallel to the center at right angles to the base 12a and the bearing support by a press machine. A bearing holder body 12 ″, which is a prototype of a substantially U-shaped cross-section bearing holder, including a base 12c and a support 12d between the base 12a and the bearing support 12c is formed.

Further, as shown in FIG. 4, an intermediate die 19a of a press machine is inserted so as to be in close contact with the opposed inner surfaces of the base 12a and the bearing support 12c which are bent in parallel. The bearing holder main body 1 is formed by an upper die (not shown) and a lower die 19c of the press machine.
The punch 19b provided on the upper die is lowered while the 2 "base 12a and the bearing support 12c are supported, and the punch 19b punches out substantially the center of the base 12a and the bearing support 12c at the same time. 5, a pair of cylindrical holes 12e, 12e are formed coaxially to complete the bearing holder 12. Then, the cylindrical hole 12 is formed.
The sintered oil-impregnated bearings 15 and 15 are fixed to e and 12e by press-fitting, and the bearing device is completed. The bearing holder body 1
2 ”is formed by the punch 19b and the base 12a and the bearing support 1
When a pair of cylindrical holes 12e, 12e are formed coaxially by punching out substantially the center of 2c, a lower die 1 serving as a mounting base is formed.
9c.

Incidentally, the bearing holder 12 is shown in FIG.
As shown in (1), a metal plate having a predetermined thickness may be punched out and temporarily have a plurality of plate members 12 ′, 12 ′...
In this case, the metal plate may use a hoop material,
One long plate may be used. A plurality of plate members 12 ', 12',...
After that, a press machine is used to form a pair of cylindrical holes 12e, 12e coaxially by bending into a substantially U-shaped cross section so as to have a base portion 12a, a bearing support portion 12c, and a support portion 12d. The portion 12g may be cut to form a bearing holder 12 "which is a prototype of a bearing holder having a substantially U-shaped cross section.

As shown in FIG. 6, in the bearing holder main body 12 ", the column 12d may be formed in an arc shape to secure the rigidity. In order to increase the rigidity of the column 12d as described above. It is also effective to provide not only a pure arc shape as described above, but also a bending reinforcing portion or a reinforcing rib which is bent so that a cross section extending in the axial direction is substantially U-shaped.

The bearing holder body 12 "is formed by punching substantially the center of the base portion 12a and the bearing support portion 12c with a punch 19b to form a pair of cylindrical holes 12e, 12e coaxially. As shown in FIG. 8 (A), the cylindrical portion 12f may be formed coaxially with the cylindrical hole 12e to have the same diameter by burring. If the cylindrical portion 12f is formed by burring in this manner, the firing may occur. It is possible to secure a large holding area and press-fitting strength of bearings such as the oil-impregnated bearings 15 and 15.

The formation of the cylindrical portion 12f by the burring process is not limited to the one protruding from the base portion 12a toward the bearing support portion 12c.
As shown in FIG. 8 (B), one protruding toward the base 12a side from the bearing support 12c, and one protruding from both the base 12a and the bearing support 12c as shown in FIG. The projecting direction and the like are not particularly limited. In the case where both the base 12a and the bearing support 12c are formed to project, the punches 19b shown in FIG. The centering accuracy is ensured even if 12e and 12e are formed. 6 to 8, the same components as those of the above-described embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In the above configuration, the bearing holder 12
After punching a metal plate into a predetermined shape, both ends of a plate 12 ′ punched by a press are bent in the same direction and parallel to form a bearing holder body 12 ″ having a substantially U-shaped cross section. A pair of cylindrical holes 12e, 12e at both ends.
Are formed coaxially, and the sintered oil-impregnated bearings 15, 15 are fixed to the cylindrical holes 12e, 12e (see FIG. 5).

When the cylindrical portion 12f is not formed in the cylindrical hole 12e of the bearing holder 12, as shown in FIG. 9, a bearing 25 with a flange is used as the sintered oil-impregnated bearing, and the small-diameter portion 25a on the outer periphery of the bearing is formed as described above. If the flange 25b, which is a large-diameter portion of the outer periphery of the bearing, is provided so as to be pressed against the bearing support portion 12c or the base 12a, the bearing is prevented from being attached at an angle, and the bearing is mounted. Can be made more stable.

From this state, as shown in FIG.
1, a bearing holder 12 is fixed via a screw 20, a stator core 13 around which a coil 14 is wound is fixed to a base 12 a of the bearing holder 12, a rotating shaft 16 is rotatably held by the bearing holder 12, and the stator core 13 is A rotor 17 is fixed to one end 16a of the rotating shaft 16 so as to face the same, and a pulley 18 is fixed to a tip of the one end 16a.

Then, the assembled brushless motor 1
0 indicates that the rotor 17 rotates integrally with the rotating shaft 16 by the current flowing through the coil 14 and the magnetic force of the magnet 17a of the rotor 17, and the rotation of the rotating shaft 16 causes the pulley 18 to rotate and the rotating shaft 16 to be pinched. A lateral pressure load is applied by a load means such as a roller R to drive the tape.

As described above, since the bearing holder 12 shown in the present embodiment is formed by press working, it is possible to shorten the working time, and furthermore, to obtain a large number of individual pieces by die molding such as die casting. There is no need to use molds, etc., and investment in molds is small, and post-processing such as lace processing, which is required when producing by mold molding, is unnecessary, so that overall cost reduction is realized. Can be. Further, since the cylindrical holes 12e, 12e can be formed coaxially at the same time, the centering accuracy is good and the motor characteristics such as reduction of shaft loss can be improved.

[0031]

As described above, claims 1 and 2
In the method of manufacturing a bearing device according to the fifth aspect, the bearing holder can be formed with high accuracy by press forming capable of high-speed processing, and the bearing device can be manufactured with high accuracy and efficiency. In addition, according to the first aspect of the present invention, the rigidity of the support portion is increased.
Therefore, it is possible to manufacture a bearing device with high accuracy and long life.

Further, according to the second aspect of the present invention, since a pair of cylindrical holes are formed at the same time, a manufacturing method with high production efficiency is obtained. According to the third aspect of the present invention, since the formation of the cylindrical hole is performed by one punch, it is easy to obtain the coaxiality of the pair of cylindrical holes. Claim 4
In the described invention, since the cylindrical hole is formed by burring, the holding area and press-fitting strength of the bearing can be increased while maintaining the production efficiency, and a more accurate and long-life bearing device can be manufactured.

The manufacturing method of the bearing device according to claim 5 is
A mounting hole for mounting the bearing holder on the substrate is formed by a punching process, and the base and the bearing support are bent at right angles to the support, so that the production efficiency is further improved and a high-precision bearing device is provided. Can be manufactured. further,
According to the sixth aspect of the present invention, since the connecting portion of each bearing holder body is cut after the bending step and the step of forming the cylindrical hole, the production efficiency can be further increased.

In the invention according to claim 7, the support portion is provided.
The rigidity of the bearing is increased, and a long-life bearing device can be manufactured. Addition
In addition, the invention according to claim 8 applies force from the side to the support portion.
Bearings that do not bend or break when subjected to
Equipment can be manufactured. Further, in the invention according to claim 9,
The cylindrical hole is formed in a cylindrical part manufactured by burring.
Bearing area while maintaining production efficiency.
And the press-fit strength can be increased, resulting in higher accuracy and longer life.
A bearing device can be manufactured.

A bearing holder for a bearing device according to claim 10.
Is made of a metallic plate material, so it must be
High-precision machining is possible, resulting in high production efficiency and high
An accurate bearing device can be provided. Further, claim 1
In addition to the above-described effects, the invention described in Patent Document 0 has a pair of cylindrical portions formed at least by burring, so that the bearing holding area and press-fit strength can be increased, and a more accurate and long-life bearing device can be provided. it can.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a brushless motor employing a bearing device of the present invention.

FIGS. 2A and 2B are views for explaining a process of manufacturing the bearing device of the present invention, wherein FIG. 2A is a perspective view of one punched plate material, and FIG. 2B is a perspective view of a plurality of punched plate materials. .

FIG. 3 is a view for explaining a process of manufacturing the bearing device of the present invention, and is a perspective view of a bearing holder body in which both ends of a plate material are bent in the same direction and in parallel.

FIG. 4 is a view for explaining a method of forming a cylindrical hole at both ends (base and bearing support), which is a part of the process of manufacturing the bearing device of the present invention.

FIG. 5 is a perspective view of a completed bearing holder and a bearing fixed to the bearing holder.

FIG. 6 is a view showing a second embodiment of the bearing holder used in the bearing device of the present invention, and is a perspective view of the bearing holder.

FIG. 7 is a view showing a third embodiment of the bearing holder used in the bearing device of the present invention, and is a perspective view of the bearing holder.

FIG. 8 is a view showing a third embodiment of the bearing holder used in the bearing device of the present invention and a modified example thereof, wherein (A) is a side sectional view of the bearing holder of the third embodiment, (B) is a side sectional view of the first modified example, and (C) is a side sectional view of the second modified example.

FIG. 9 is a side sectional view of a main part of a bearing device of the present invention showing an example using a bearing with a flange.

FIG. 10 is a longitudinal sectional view of a brushless motor employing a conventional bearing device.

FIG. 11 is a perspective view of a conventional bearing device.

[Explanation of symbols]

 Reference Signs List 12 bearing holder 12a base (one of both ends) 12c bearing support (the other of both ends) 12d support 12e cylindrical hole 15 sintered oil-impregnated bearing (bearing)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F16C 35/02 B21D 53/10

Claims (10)

(57) [Claims] 1. A metal plate, which is a single flat plate, is punched into a predetermined shape, and both ends of the plate are bent in the same direction and parallel to form a bearing holder body having a substantially U-shaped cross section. , a pair of cylindrical holes in the upper Symbol both end portions formed coaxially secured a bearing for rotatably holding the rotary shaft in respective cylindrical bore, the bearing ho
The support part connecting the both ends of the rudder body is
A method of manufacturing a bearing device, wherein the bearing device is formed in an arc shape with respect to a direction intersecting an axis of the bearing device. 2. A metal plate, which is a single flat plate, is punched into a predetermined shape, and both ends of the plate are bent in the same direction and in parallel to form a bearing holder body having a substantially U-shaped cross section. , a pair of cylindrical holes in the end portions formed coaxially secured a bearing for rotatably holding the rotary shaft to respective cylindrical holes, the pair
The cylindrical hole should be up so as to be in close contact with the opposing surfaces at both ends.
Simultaneously supported by a die inserted between both ends
A method for manufacturing a bearing device, characterized by being punched . 3. The pair of cylindrical holes are formed by a single punch.
3. The method according to claim 2, wherein the bearing is punched . 4. A metal plate, which is a single flat plate, is formed in a predetermined shape.
After the punching, the both ends of the above plate material are
Bend to form a bearing holder body with a substantially U-shaped cross section.
A pair of cylindrical holes are formed coaxially at both ends, and each cylindrical hole is
The bearing that holds the rotating shaft so that it can rotate is fixed.
A cylindrical portion having the cylindrical hole in at least one of
This cylindrical part is formed along the axial direction of the rotating shaft.
And coaxial with the cylindrical hole by burring
A method for manufacturing a bearing device, characterized in that the bearing device is formed . 5. A bearing holder forming step of forming a bearing holder.
And the rotary shaft is rotatably held in the same cylindrical hole of the bearing holder.
For manufacturing a bearing device, comprising the steps of:
Contact stomach in, the bearing holder forming step, gold one flat plate
From the metal plate to the mounting part of the bearing holder and one side
And the other side bearing
Bearing support for supporting, the base and the bearing support
For a bearing holder body having a support portion connecting between the support portion and the support portion
The step of punching the material, the base and the bearing support
Bending the support column in the same direction and parallel to the support,
Each of the base and the bearing support is coaxial.
Forming the cylindrical hole for holding the bearing so that
In the process of punching the material for the bearing holder body
And a substrate on which the bearing holder is mounted on the base.
At the same time, the base and the shaft
In the step of bending the receiving support portion, the base and the shaft
The method for manufacturing a bearing device, wherein the receiving support portion is bent at a right angle to the support portion . 6. A process for punching a material for the bearing holder body.
In the process, the one piece of metal is connected to each other by a connecting portion.
Of multiple bearing holder body materials as original plates
Forming the cylindrical hole and the bending step
6. The method for manufacturing a bearing device according to claim 5, further comprising a step of cutting the connecting portion after the step . 7. The support portion extends in the axial direction of the rotation shaft.
The method for manufacturing a bearing device according to claim 5 , wherein the bearing device has a reinforcing shape . 8. The reinforcing shape of the support portion may be an axis of the rotating shaft.
The method for manufacturing a bearing device according to claim 7 , wherein the bearing device has a curved shape in a cross section orthogonal to the direction . 9. The cylindrical hole is formed by burring.
Formed in a cylindrical portion protruding in the axial direction of the rotating shaft
Method of manufacturing a bearing device according to claim 5, characterized in that Te. 10. A bearing holder mounting portion and one side.
And the other side bearing
Bearing support for supporting, the base and the bearing support
And a support portion connecting between the base portion and the base portion.
The bearing support portion has a pair of cylindrical holes coaxially,
The base and the bearing support are one metal plate and the support
Bearing holder formed by bending parallel to
A bearing fixed to the hole and rotatably holding the rotating shaft.
For example, the pair of cylindrical holes, the bearing apparatus characterized by formed by a cylindrical portion projecting in the axial direction of the rotary shaft which is formed by at least burring.