JPH10108433A - Brushless motor, equipment with built-in motor, and jig for press fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of parts and assembling man-hours, by inserting a housing, inserted in a first hole in a printed board, into a second hole, and sandwiching the printed board between the stepped portion and the projected pieces of the housing to secure a mounting body. SOLUTION: A first hole 1a is formed in a printed board 1, and a housing 2 is inserted into the first hole 1a. A mounting plate 13 is press fit into the housing 2 with the printed board 1 sandwiched. Subsequently, the housing 2 of a stator assembly is inserted into a second hole 13 in the mounting plate 13 with the supporting section of the printed board 1 in contact with the housing 2, and is depressed. Thereby the projected pieces on the mounting plate 13 are press fit into the side of the housing 2, and the supporting section of the printed board 1 is clamped between the stepped portion of the housing 2 and the projected pieces and secured. Thereafter, rotation can be brought into balance by actually rotating the rotor assembly using the drive circuit within the rotor assembly to measure eccentricity, and applying putty 12 to a rotor yoke 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brushless motor, a motor-incorporated device such as an office machine and a storage device incorporating the brushless motor, and a press-fitting jig used when assembling the brushless motor.

[0002]

2. Description of the Related Art Since a brushless motor is used as one component in a drive unit of an office machine such as a copying machine and a printer and a storage device such as a hard disk device, there is a strong demand for cost reduction. There is an urgent need to review each part of itself, improve the assembly structure, and reduce costs.

As shown in FIG. 17, a conventional brushless motor forms a frequency power generation pattern and other wiring patterns, and forms a driver IC 112 a and a socket 112.
Printed circuit board 122 on which electronic component 112 such as b is mounted
Then, while positioning the stator core 120 around which the coil 121 is wound with the spacer 123, the stator core 120 is attached.
Is soldered to the printed circuit board 122, a housing 124 having ball bearings 125, 126 attached to bearings 124b is inserted into holes of the printed circuit board 122, and a stator core 120 is fixed to the housing 124 with screws 113 to fix the stator. While assembling the assembly, a flange 118 is press-fitted and fixed to the shaft 117, a magnet 116 is fixed to the rotor yoke 115, and the rotor yoke 115 and the flange 118 are fixed with screws 114 to make a rotor assembly. Is assembled to the stator assembly.

The housing 124 used in this brushless motor is formed by integrally forming a bearing portion 124b for mounting a rotor assembly and a mounting portion 124a for mounting the motor itself to a printer or the like.

By the way, in the case of this conventional brushless motor, when comparing the number of parts between the rotor assembly and the stator assembly, the number of parts of the stator assembly is overwhelmingly large, and the process balance in the motor manufacturing process is poor. . This is because it is an essential requirement that a printed circuit board 122, a sub-processed product on which electronic components are mounted, be mounted on the stator assembly side in order to determine the shape of the housing 124 and the position of the coil 121.

Further, the fact that the stator assembly cannot be produced until after the printed circuit board sub-processed product is produced also causes a poor process balance.

[0007]

As described above, in the above-described conventional brushless motor, a printed circuit board on which electronic components are mounted is indispensable as a stator assembly, so that many components are provided on the stator assembly side. There is a problem that the bias is improper, the process balance in the motor manufacturing process is poor, and a large number of assembly steps are required.

SUMMARY OF THE INVENTION The present invention has been made to solve such problems, and reduces the number of parts so as to improve the process balance and reduces the number of assembling steps. It is an object of the present invention to provide a brushless motor, a motor-incorporated device, and a press-fitting jig which can reduce the cost of a driving device and the like.

[0009]

According to a first aspect of the present invention, there is provided a brushless motor having a step for holding a substrate and having at least a stator core fixed thereto; A printed circuit board having a first hole engaged with a step portion for positioning the housing in the insertion direction and the rotation direction, wherein the printed circuit board has the housing inserted in the first hole, and a protrusion for press-fitting the housing. A second hole provided with a piece corresponding to the step,
A mounting plate, wherein the housing inserted into the first hole of the printed board is inserted into the second hole, and the printed board is fixed by sandwiching the printed board between the step portion of the housing and the projecting piece. I have.

In the case of the first aspect of the present invention, the housing is inserted into the first hole of the printed circuit board, and the housing is inserted into the second hole of the mounting plate. The printed circuit board is sandwiched between the projecting pieces of the holes 2 and fixed.

This eliminates the need for a positioning spacer conventionally used, thereby reducing the number of components and the number of assembly steps.

According to a second aspect of the present invention, there is provided a brushless motor having a step for holding a substrate, at least a housing to which a stator core is fixed, and engaging the step with the housing to insert the housing in an inserting direction and a rotating direction. A printed circuit board having the housing inserted into the first hole, and a second hole provided with a projecting piece for press-fitting into the housing corresponding to the stepped portion. A mounting plate having the housing inserted into the first hole of the printed circuit board being press-fitted into the second hole, and fixing the printed circuit board by sandwiching the printed circuit board between the stepped portion of the housing and the projecting piece. Is provided.

In the second aspect of the present invention, the printed circuit board is sandwiched and fixed between the step portion of the housing and the projecting piece of the mounting plate by press-fitting the housing into the second hole of the mounting plate. Parts such as screws and screws for fixing to the mounting plate become unnecessary, and the number of parts can be reduced and the number of assembling steps can be reduced.

According to a third aspect of the present invention, there is provided the brushless motor according to the first aspect, wherein the stepped portion of the housing sandwiching the printed circuit board and the projecting piece of the mounting plate are caulked and fixed. I have.

In the case of the third aspect of the present invention, since the step portion of the housing and the mounting plate are caulked and fixed, parts such as screws and screws for fixing the housing and the mounting plate are not required.

According to a fourth aspect of the present invention, in the brushless motor according to the first to third aspects, the printed circuit board pulls out a lead wire drawn from a coil wound around the stator core to the back side. , A relief portion for the step portion of the housing, a support portion on which the step portion of the housing is placed, and a positioning portion for positioning the housing.

In the case of the fourth aspect of the present invention, the position of the housing is determined by the positioning portion of the printed circuit board, the step of the housing is placed on the support portion, and the escape portion is inserted deeper than the step of the housing. Further, since the cutout portion is provided so that the lead wire can be drawn out to the back side of the board, the printed board and the housing can be efficiently fixed without using a conventionally used spacer or the like.

A brushless motor according to a fifth aspect of the present invention is the brushless motor according to the fourth aspect, wherein a pair of the support portion and the support portion disposed opposite to each other via a rotary shaft with respect to the relief portion is used as the print. It is characterized in that n pairs are arranged on the substrate.

According to the fifth aspect of the present invention, the printed board and the housing can be fixed while being positioned by forming the escape portion and the support portion as a pair.

According to a sixth aspect of the present invention, there is provided the brushless motor according to the first aspect, wherein the mounting plate fixed by sandwiching the printed circuit board between the stepped portion of the housing and the projecting piece comprises: A support portion for supporting the printed circuit board is provided.

In the sixth aspect of the present invention, since the printed board is supported by the supporting portion of the mounting plate, the printed board is vibrated while holding the printed board between the steps of the housing and the projecting pieces and fixing the printed board. Can be eliminated.

According to a seventh aspect of the present invention, in the brushless motor according to the fourth aspect, a positioning projection is provided on the housing in correspondence with the positioning portion of the printed circuit board.

In the case of the present invention, since the positioning projections of the housing are engaged with the positioning portions of the printed circuit board to determine the mutual positions, a special member for positioning, that is, a spacer is not required. .

According to an eighth aspect of the present invention, in the brushless motor according to the first to third aspects, the brushless motor is directly or indirectly supported by a shaft rotatably supported by the housing, and has a hole in an upper surface thereof. It is characterized by having a rotor yoke.

In the case of the present invention, when the rotor assembly is incorporated into the stator assembly to form a rotary structure, the pin of the balancing jig is inserted into the hole on the upper surface of the rotor yoke to rotate the rotor portion. By doing so, it is possible to balance the rotation without a printed circuit board.

After that, when the mounting plate is press-fitted into the rotating structure, a pin of a press-fitting jig is inserted into a hole of the rotor yoke, and the pin is brought into contact with a stator core or the like to receive a force for pressing the mounting plate. Thereby, the mounting plate can be pressed into the rotating structure without adding the rotor portion.

According to a ninth aspect of the present invention, in the brushless motor of the eighth aspect, the rotor yoke is directly press-fitted and fixed to the shaft.

In the case of the ninth aspect, the rotor yoke is directly press-fitted and fixed to the shaft, so that a flange is not required, and the number of parts can be reduced.

According to a tenth aspect of the present invention, there is provided a brushless motor having a housing having a through hole for positioning the substrate, a step for holding the substrate, and a projection for press-fitting, wherein at least a stator core is fixedly mounted, and And a third hole corresponding to the protrusion and the through-hole. The third hole is provided with the protrusion of the housing and the third hole corresponding to the protrusion. A printed circuit board in which the housing is inserted into one hole, and a second hole provided with a projecting piece for press-fitting into the housing corresponding to a wall surface of the stepped portion and the projecting portion; The protruding piece is pressed into the inner wall surface of the protruding portion while inserting the housing inserted into the first hole into the second hole, and the printed circuit board is sandwiched between the step portion of the housing and the protruding piece. Solid It has and a the mounting plate.

According to the tenth aspect of the present invention, the housing is provided with a stepped portion for holding the substrate having a through hole for positioning the substrate and a protrusion for press-fitting, and the printed circuit board corresponds to the protrusion for press-fitting. By providing the third hole, the printed board can be sandwiched and fixed between the step portion of the housing and the projecting piece of the mounting plate while the projecting piece of the mounting plate is pressed into the inner wall surface of the projecting portion of the housing. In other words, it is possible to press-fit not only at the wall surface of the housing body (position close to the rotation axis) but also at other places (positions away from the rotation axis). it can.

According to an eleventh aspect of the present invention, in the brushless motor according to the tenth aspect, a supporting tap hole is formed in the protrusion, and the projecting piece of the mounting plate is formed by supporting the supporting tap hole. The housing is press-fitted into the inner wall surface of the projection.

In the case of the eleventh aspect of the present invention, the mounting plate is press-fitted (crimped) into the housing without attaching the rotor portion by attaching and pulling a jig into the support tap hole of the projection. it can.

A brushless motor according to a twelfth aspect of the present invention is the brushless motor according to the first to eleventh aspects,
The printed circuit board has a component mounting surface and a soldering surface, and has a wiring pattern formed only on the soldering surface, and a magnet for frequency power generation that rotates about a rotation axis on the component mounting surface side. And a pattern for frequency power generation corresponding to the magnet for frequency power generation is formed on the soldering surface.

In the case of the twelfth aspect, by forming the pattern for frequency power generation on the soldering surface, it is only necessary to form all the wiring patterns only on the soldering surface, thereby reducing the cost of the printed circuit board. Can be planned.

According to a thirteenth aspect of the present invention, there is provided a motor-incorporated device in which the brushless motor according to the first to twelfth aspects is incorporated.

According to the thirteenth aspect of the present invention, the cost of the entire motor-integrated device can be reduced.

According to a fourteenth aspect of the present invention, there is provided a press-fitting jig comprising: a base; an annular pressing portion protruding from the base; a positioning pin provided to protrude from the pressing portion; And a holding pin which is provided with a screw thread and which operates independently with respect to the base.

In the case of the present invention, since the holding pin is operated independently of the base, the housing is pulled by the holding pin while the mounting plate is pressed by the base, for example. This allows the mounting plate to be pressed into the housing.

According to each of the above-mentioned inventions, the conventionally used positioning spacers, screws, screws, and the like become unnecessary, and the number of parts and the number of assembling steps can be reduced. In addition, a printed circuit board processed product, which was one part of the stator assembly, can be manufactured independently of the stator assembly, so that various mounting procedures can be set up and the component configuration of each assembly can be adjusted. The bias is reduced, and the process balance can be improved.

[0040]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a view showing the configuration of a brushless motor according to a first embodiment of the present invention, FIG. 2 is a plan view of a printed circuit board viewed from above, FIG. 3 is a view showing the shape of a housing, and FIG.
Is a view showing the shape of the mounting plate, and FIG. 5 is a view showing the shape of the rotor yoke.

In FIG. 1, reference numeral 1 denotes a printed circuit board.
On the soldering surface (the lower surface side in FIG. 1) of the printed circuit board 1, a frequency power generation pattern and other wiring patterns are formed. On the upper surface (the upper surface side in FIG. 1) of the printed circuit board 1, the driver IC 112a and the socket 112
Electronic components 112 such as “b” are mounted. The printed circuit board 1 has a first hole 1a. The housing 2 is inserted into the first hole 1a. The housing 2 has a stator core 4 around which a coil 3 is wound.
Are inserted from above in the figure. This stator core 4
It is fixed by press-fitting the fixing ring 5 into the housing 2 from above. A shaft 8 as a rotating shaft is rotatably supported by the housing 2 by bearings 6 and 7. A flange 9 is press-fitted and fixed to the shaft 8. This flange 9 has a rotor yoke 1
0 is fixed by swaging. The rotor yoke 10 may be directly fixed to the shaft 8 by caulking. Rotor yoke 1
0 has a jig hole 10a. A magnet 11 in which a main magnet (for the stator core) and a frequency power generation magnet (a magnet for the printed circuit board surface) are integrally formed is fixed to the inner edge of the rotor yoke 10. A putty 12 is attached to the lower end of the magnet 11 or the hole 10a of the rotor yoke 10, so that the rotation of the rotor portion is balanced. The mounting plate 13 is press-fitted into the housing 2 so as to sandwich the printed circuit board 1. In addition to the press-fitting, for example, the housing 2 sandwiching the printed circuit board 1 and the mounting plate 13 may be fixed by caulking.

As shown in FIG. 2, the printed board 1 is a so-called single-sided board having a pattern printed only on one side. The printed circuit board 1 includes a first hole 1a, relief portions 1A, 1B, 1C, a positioning portion 1D, support portions 1E, 1F, 1G, and the like. Escape part 1A, 1
B, 1C are provided with cutouts 1H for passing the lead wires of the coil 3 to the soldering surface side. The substrate support structure is established by using each support 1E, 1F, 1G and the step 2D of the housing 2 as a pair. In this example, the number of pairs is three. However, the number may be more or at least good, and n pairs may be arranged.

FIG. 2 shows the printed circuit board 1 as viewed from the component mounting surface (front surface) side, and three Hall elements 112c are mounted at intervals of 60 degrees from the center of the first hole 1a. Also, on the soldering side of this printed circuit board 1,
A soldering land (not shown) for soldering a lead wire from the coil 3 is formed.

The dotted line in the drawing is the frequency power generation pattern 1I formed on the soldering surface side. This frequency power generation pattern 1I generates frequency power with a gap between the thickness of the printed circuit board 1 and the frequency power generation magnet of the rotor yoke 10 (the portion of the magnet 11 with respect to the printed circuit board surface). This gap is usually 0.
Generally about 3 to 0.5 mm, for example, 24 pulses / se
c, Experiments at 245 rpm proved that there was no problem up to about 3.5 mm, and this was applied to this single-sided substrate.

As shown in FIGS. 3 (a) and 3 (b), the housing 2 includes step portions 2B, 2D, 2J, 2L, 2G and side surfaces 2B.
A, 2C, 2E, 2F, 2K, and 2H, and a projection 2I. The length of the side surface 2E is set substantially the same as the thickness of the printed circuit board 1. The support portions 1E, 1F, and 1G of the printed circuit board 1 are mounted on the surface of the step portion 2J. Projection 2I
Is provided so as to engage with the positioning portion 1D of the printed circuit board 1, and performs positioning of the printed circuit board 1 and the housing 2 in the rotational direction. The steps 2B and 2D of the housing 2 and the step 2J are opposed to each other via the axis of the housing 2 and are paired. In this embodiment, three pairs are provided at intervals of 120 degrees around the axis of the housing 2. I have.

As shown in FIGS. 4A and 4B, the mounting plate 13 has a second hole 13a and a fixing portion 1 for fixing a printer or the like.
3b, a support claw 13c for guiding the printed circuit board 1, and a cutout 13d for providing a space for an operator to solder a lead wire from the coil 3 to a soldering land of the printed circuit board 1 are provided. A projecting piece 14 for press-fitting the housing 2 is provided in the second hole 13a. The projecting piece 14 is provided on the side surface 2C (2
I) and the side surface 2E. As shown in FIGS. 1 and 5, on the upper surface of the rotor yoke 10,
Three jig holes 10a are provided at substantially equal distances from the center and at intervals of 120 degrees. A jig pin is inserted into the hole 10a when a rotor assembly is manufactured and rotational balance is obtained. The hole 10a is also used as a jig for receiving the stator assembly itself in a subsequent operation because the rotor assembly is covered by the stator assembly when the rotor assembly is assembled into the stator assembly. .

The procedure for assembling the brushless motor according to the first embodiment will be described below with reference to FIGS.

As an assembly procedure of this brushless motor, first, three processed products, that is, a processed product of a printed board, a rotor assembly, and a stator assembly are assembled.

When processing the printed circuit board, chip components are mounted on the soldering surface (back surface) of the printed circuit board 1 on which the wiring pattern is formed, and then the driver IC 112a and the socket are mounted from the component mounting surface (front surface) side of the printed circuit board 1. By inserting the electronic components 112 such as 112b and the Hall element 112c and soldering the back surface of the printed circuit board 1 automatically, the printed circuit board processed product 60 as shown in FIG.
Build in.

When making the rotor assembly, the shaft 8 is press-fitted and fixed to the flange 9. The magnet 11 is fixed to the inner edge of the rotor yoke 10. Then, the rotor yoke 10 is caulked and fixed to the flange 9 into which the shaft 8 is press-fitted, thereby producing a rotor assembly 61 as shown in FIG.

When making a stator assembly, first, the bearings 6 and 7 are fixed to the housing 2. Subsequently, the stator core 4 around which the coil 3 is wound is inserted into the housing 2 from above, and the stator ring 4 is fixed to the housing 2 by press-fitting the fixing ring 5 into the housing 2 from above. A stator assembly 62 as shown is made. The bearing 6 may be a component on the rotor assembly 61 side. When the bearing 6 is fixed to the shaft 8, workability when inserting the shaft 8 into the housing 2 is better.

After the three processed products, that is, the processed product of the printed circuit board 60, the rotor assembly 61, and the stator assembly 62, are assembled, various combinations are possible.

First, a procedure may be considered in which after fixing the printed circuit board product 60 to the stator assembly 62, the rotor assembly 61 is assembled.

In this case, as shown in FIG. 9, the housing 2 of the stator assembly 62 is inserted into the first hole 1a of the printed circuit board 1 of the processed printed circuit board 60, and the support portions 1E, 1F of the printed circuit board 1 are inserted. , 1G and step 2J of housing 2
And abut.

Subsequently, the supporting portions 1E, 1
The housing 2 of the stator assembly 62 is inserted into the second hole 13a of the mounting plate 13 in a state where F, 1G are in contact with the stepped portion 2J, and pressed, so that the side surfaces 2C, 2
The protruding piece 14 of the mounting plate 13 is pressed into I (2A), and the supporting portions 1E, 1F, and 1G of the printed circuit board 1 are sandwiched and fixed between the step 2J of the housing 2 and the protruding piece 14 of the mounting plate 13. .

In this case, once the printed circuit board processed product 60 is fixed to the stator assembly 62, the coil 3 is soldered to the printed circuit board 1 and the rotor assembly 61 is inserted. , The rotor assembly 61 is actually rotated by an internal drive circuit to measure the state of eccentricity.
The putty 12 is attached to the rotor yoke 10 so as to balance the rotation.

Further, a procedure may be considered in which the rotor assembly 61 is incorporated into the stator assembly 62 to form a rotary structure, and then the printed circuit board processed product 60 is fixed to the rotary structure.

In this case, when the rotor assembly 61 is incorporated into the stator assembly 62, a rotary structure 64 as shown in FIG. 10 is obtained. In the state of the rotating structure 64, the coil 3
Since it is impossible to supply power to the rotor yoke, the rotation of the rotor yoke 10 cannot be balanced. Therefore, in this case, a jig 70 for rotational balance is used. The rotation balance jig 70 is provided with pins 70 a at positions corresponding to the three holes 10 a of the rotor yoke 10. The rotation structure 64 is fixed to the jig 70 for fixing the rotation yoke 10. A pin 70a is inserted into the hole 10a, and the pin 70a rotates the rotor yoke 10 from the outside.

The rotor yoke 10 is rotated by the rotation balance jig 70, and the putty 12 is attached to the rotor yoke 10 to balance the rotation.

Thereafter, the housing portion of the rotating structure 64 is inserted into the first hole 1a of the printed circuit board 1 of the processed printed circuit board 60, and the support portions 1E, 1
F, 1G are brought into contact with the step 2J of the housing 2.

Subsequently, the support portions 1E, 1
The housing 2 of the stator assembly 62 is inserted into the second hole 13a of the mounting plate 13 in a state where F, 1G are in contact with the stepped portion 2J, and pressed, so that the side surfaces 2C, 2
The protruding piece 14 of the mounting plate 13 is pressed into I (2A), and the supporting portions 1E, 1F, and 1G of the printed circuit board 1 are sandwiched and fixed between the step 2J of the housing 2 and the protruding piece 14 of the mounting plate 13. .

In this case, the housing 2 is connected to the mounting plate 1
3 when the rotor yoke 1 is inserted into the second hole 13a.
A pressing jig is applied from above the zero, and the pins of the jig are brought into direct contact with the stator core 4 or the fixing ring 5 through the holes 10 of the rotor yoke 10. Thereby, the mounting plate 13 can be pressed into the housing 2 without applying a load to the rotor assembly 61.

Then, finally, the lead-out wire from the coil 3 is soldered to the soldering land of the printed circuit board 1 to check the operation, and the assembling operation is completed.

By incorporating the rotor assembly 61 first in the stator assembly 62 in this way, the mechanical part of the motor is almost completed, and the subsequent assembling process is performed with the printed circuit board processed product 60 and the mounting plate 13. The operation can be simplified only by assembling the simple operation and the operation check.

As described above, according to the brushless motor of the first embodiment, since the stator core 4 is inserted into the housing 2 and the fixing ring 5 is pressed into the housing 2 from above, the stator core 4 is fixed. Screw 1
13 could be deleted. The flange 9 and the rotor yoke 10
The screw 114 was able to be eliminated by adopting a structure in which the screw 114 was fixed by caulking. Further, the housing 2 is provided with a step 2J, and the first part of the printed circuit board 1 corresponding to the step 2J.
The supporting portions 1E, 1F and 1G are provided in the holes 1a of
E, 1F and 1G are connected to the step 2J of the housing 2 and the mounting plate 13
The spacer 123 could be deleted by being sandwiched and fixed between the projection pieces 14. By reducing the number of these components, the man-hour for assembling the entire motor could be reduced.

The mounting portion is separated from the housing 2 to form a plate-like mounting plate 13, and the printed circuit board 1 is sandwiched and fixed between the housing 2 and the mounting plate 13. Substrate processed product 6
0 can be made independent, and three assemblies, that is, a stator assembly 62, a rotor assembly 61, and a printed circuit board processed product 60, can be simultaneously manufactured, and can be assembled in various orders. Accordingly, it has become possible to combine these assemblies 60, 61, and 62 at one manufacturing location assembled at different manufacturing locations. In addition, since the bias of the component configuration of each of the assemblies 60, 61, and 62 was alleviated, the process balance could be improved.

Further, by supporting the printed circuit board 1 with the plurality of support claws 13c of the mounting plate 13, it is possible to prevent the printed circuit board 1 from vibrating when the motor rotates. Next, a second embodiment according to the present invention will be described with reference to FIGS.
The brushless motor according to the embodiment will be described. FIG.
FIG. 12 is a view showing a configuration of a brushless motor according to a second embodiment of the present invention, FIG. 12 is a view showing a shape of a housing, and FIG.
FIG. 3 is a view showing a shape of a mounting plate. In each of the drawings, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In FIG. 11, reference numeral 81 denotes a printed circuit board. The printed circuit board 81 is obtained by adding a new third hole 81a to the printed circuit board 1. The projection 82a of the housing 82 is inserted into the third hole 81a of the printed circuit board 81. The shaft 8 has a flange 8
9 is press-fitted and fixed. The flange 89 is provided with a caulking projection 89a. This flange 8
9, a rotor yoke 90 is fixed by caulking the projection 89a. Therefore, the rotor yoke 90
Has a larger hole diameter at the center than the rotor yoke 10 of the first embodiment. The printed circuit board 8 is provided in the housing 82.
Mounting plate 9 so as to sandwich the supporting portions 1E, 1F, and 1G.
3 is press-fitted.

As shown in FIGS. 12 (a) and 12 (b), the housing 82 includes projections 82a and 82b and a step 82D.
82J, 82L, 82G and side surfaces 82A, 82C, 82
E, 82F, 82K, and 82H. Projection 8
A tap hole (supporting tap hole) 82M for supporting itself at the time of press-fitting is formed in 2a in the axial direction. A through hole 82N for positioning is formed in the protrusion 82b in the axial direction. The through hole 82N is
1, for positioning the housing 82 and the mounting plate 93 in the rotational direction, and the pins of the jig are inserted at the time of assembly. The printed board 81 is provided on the surface of the step 82J.
Support portions 1E, 1F, and 1G are placed. The length of the side surface 82E is a length that can form the tap hole 82M. The step portion 82D and the step portion 2J of the housing 82 are opposed to each other via the axis of the housing 2 and are paired. In this embodiment, three pairs are provided at intervals of 120 degrees around the axis of the housing 2.

As shown in FIGS. 13 (a) and 13 (b), an operator prints a hole 93a for press-fitting the housing 82, a joint 93b with a printer or the like, and a lead wire from the coil 3 on the mounting plate 93. Notch 93d for forming a space for soldering on the soldering land of substrate 1 and hole 93 for jig
e and 93f are provided. A projecting piece 94 for press-fitting the housing 82 is provided in the hole 93a.
The protruding piece 94 is provided so as to be in contact with the inner wall surface of the housing 82, that is, the side surface 82A, the step portion 82D, and the side surface 82C.

Hereinafter, referring to FIG. 14 and FIG.
An assembly procedure of the brushless motor according to the embodiment will be described.

The procedure for assembling the brushless motor of the second embodiment is similar to that of the first embodiment. First, a printed board processed product, a rotor assembly, and a stator assembly are used.
And then assembling the rotor assembly into the stator assembly to form a rotating structure 9 as shown in FIG.
After that, the printed circuit board processed product 96 is fixed to the rotating structure 95.

Thereafter, the housing portion of the rotating structure 95 is inserted into the first hole 1a of the printed circuit board 81 of the processed printed circuit board 96, and the projection 82a is inserted into the third hole 8a.
1a, supporting portions 1E, 1F,
1G is brought into contact with the step 82J of the housing 82.

Subsequently, the support portions 1E of the printed circuit board 81,
The housing 82 is inserted into the hole 93a of the mounting plate 93 in a state where 1F and 1G are brought into contact with the step portion 82J, and pressed, so that the projecting pieces 94 of the mounting plate 93 are formed on the side surfaces 2A and 2C of the housing 82 and the step portion 82D. Is press-fitted, and the support portions 1E, 1F, and 1G of the printed circuit board 81 are
And the protruding piece 94 of the mounting plate 93 to be sandwiched and fixed.

When the mounting plate 93 is press-fitted into the rotating structure 95 to which the processed printed circuit board 96 is applied, the rotor yoke 90 is in an unstable state and cannot receive this portion.

In this case, a press-fitting jig 100 as shown in FIG. 15 is used.

The press-fitting jig 100 includes an annular pressing portion 102 protruding from a base 101, a positioning pin 103 provided to protrude from the pressing portion 102, and a thread (tap) at the tip. 1) Pin for holding down
04. The annular pressing portion 102
This is a portion on which the projecting piece 94 of the mounting plate 93 is placed. The press-fitting jig 100 has a two-piece structure in which the holding pin 104 moves independently of the base 101.

After the mounting plate 93 is placed on the press-fitting jig 100, the housing 82 is inserted into the mounting plate 93. At this time, the through hole 82N of the housing 82 and the printed circuit board 8
The first third hole 81a and the hole 93f of the mounting plate 93 are inserted while being aligned.

The supporting tap hole 8 of the housing 82
When the holding pin 104 of the press-fitting jig 100 comes into contact with the 2M, the holding pin 104 is rotated to support the screw thread and screw into the tap hole 82M.

Subsequently, with the base 101 of the press-fitting jig 100 fixed at that position, the holding pin 104 is
5 in the direction of arrow S, the mounting plate 93 is attached to the inner wall surfaces 82A, 82C and 82D of the housing 82.
Of the printed board 81 is press-fitted.
E, 1F, and 1G are sandwiched and fixed by the step 82J of the housing 82 and the projecting piece 94 of the mounting plate 93.

Thus, the mounting plate 93 can be pressed into the housing 82 without applying a load to the rotor yoke 90.

Finally, when the lead wire from the coil 3 is soldered to the soldering land of the printed circuit board 81 and the operation is checked, the assembling operation is completed.

By incorporating the rotor assembly into the stator assembly in this way, the mechanical part of the motor is almost completed, and the subsequent assembling process involves assembling the printed circuit board processed product 96 and the mounting plate 93. The work can be simplified to only simple work and operation check.

As described above, according to the brushless motor of the second embodiment, it goes without saying that the effect of the first embodiment can be obtained, and in addition to this effect, the upper end 89a of the flange 89 is formed in a tapered shape. Since the rotor yoke 90 is fixed by caulking at 89a, no distortion occurs in the bearing of the housing 82, and the shaft 8 can be smoothly inserted into the housing 82.

Further, the projections 82a, 82
b, and a third hole 81a is provided in the printed circuit board 81 corresponding to these projections 82a, 82b.
By providing the holes 93e and 93f in the holes and using the press-fitting jig 100, the motors can be built after the assembled products are combined into a substantially completed rotating structure 95. This allows the motors to be assembled in various assembly orders.

As a result, it is possible to reduce the number of assembling steps of the motor as a whole while preventing problems caused by the caulking structure and the press-fitting structure of each part.

Next, a brushless motor according to another embodiment will be described with reference to FIG. As shown in the figure,
The brushless motor of this embodiment is a modification of the brushless motor of the first embodiment.

The housing 105 of this brushless motor
The upper end portion 105a has a tapered shape for caulking. The taper of the upper end portion 105a is set at an inclination of 30 degrees with respect to the axis and at a depth of about 2 mm.

Generally, parts such as a housing are provided at the end.
A taper of about 0.5R is used to smooth the insertion of parts such as bearings. However, when the ends are crimped, distortion due to the caulking occurs in the bearing portion, and thereafter, it becomes difficult to insert the bearing. In some cases, it cannot be inserted.

Therefore, in the case of the brushless motor of this embodiment, the upper end portion 105a of the housing 105 is formed in a tapered shape having a depth of about 2 mm so that distortion due to caulking is not transmitted to the bearing portion. Can be retrofitted to

The procedure for assembling the brushless motor is as follows. First, the stator core 4 is inserted into the housing 105, and then several places of the upper end portion 105 a of the housing 105 are caulked to the outside, thereby fixing the stator core 4 to the housing 1.
Fix to 05. Thereafter, the ball bearings 6 and 7 are inserted into the housing 105 and fixed.

In the case of this brushless motor, the stator core 4 is fixed only by caulking the upper end portion 105a of the housing 105, and the fixing ring 5 used in the first and second embodiments is not required. it can.

As described above, according to the brushless motor of this embodiment, the fixing ring 5 used in the first embodiment can be eliminated, and the number of parts constituting the motor can be reduced.

It is needless to say that this caulking fixing structure can also be used in the second embodiment.

[0096]

As described above, according to the present invention, the printed circuit board is sandwiched and fixed between the step of the housing and the projecting piece of the mounting plate, so that the positioning spacer conventionally used is unnecessary. Thus, the number of parts and the number of assembling steps can be reduced.

Further, since the printed circuit board processed product included in the stator assembly is made independent of the stator assembly, various assembling procedures can be set, and the bias of the component configuration of each assembly is reduced. In addition, the process balance can be improved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a brushless motor according to a first embodiment of the present invention.

FIG. 2 is a plan view of the printed circuit board of the brushless motor according to the first embodiment as viewed from above.

FIG. 3A is a bottom view of a housing of the brushless motor according to the first embodiment. FIG. 3B is a sectional view taken along line AA ′ of the housing in FIG.

FIG. 4A is a plan view of the mounting plate of the brushless motor according to the first embodiment as viewed from above. (B) is a BB 'side view of the attachment plate of FIG. 4 (a).

FIG. 5 is a view showing a rotor yoke of the brushless motor according to the first embodiment.

FIG. 6 is a view showing a processed product of a printed circuit board.

FIG. 7 shows a rotor assembly.

FIG. 8 shows a stator assembly.

FIG. 9 is a diagram showing a state in which a stator assembly and a printed circuit board are assembled.

FIG. 10 is a diagram showing a state in which a processed product of a printed circuit board is incorporated after the rotor assembly and the stator assembly are assembled.

FIG. 11 is a diagram illustrating a configuration of a brushless motor according to a second embodiment of the present invention.

FIG. 12A is a bottom view of a housing of the brushless motor according to the second embodiment. FIG. 13B is a cross-sectional view of the housing of FIG.

FIG. 13A is a plan view of a mounting plate of the brushless motor according to the second embodiment as viewed from above. FIG. 12B shows the state shown in FIG.
DD 'plane view of the mounting plate of FIG.

FIG. 14 is a diagram showing an assembly procedure of the brushless motor according to the second embodiment.

FIG. 15 is a view showing a jig for press-fitting the mounting plate.

FIG. 16 is a diagram showing a configuration of a brushless motor according to another embodiment.

FIG. 17 is a diagram showing a conventional brushless motor.

[Explanation of symbols]

1, 81: printed circuit board, 1a: first hole, 2, 82,
105 ... Housing, 2B, 2D, 2J, 2L, 2G ...
Steps, 2A, 2C, 2E, 2F, 2K, 2H ... side surface, 3
... coils, 4 ... stator cores, 5 ... fixing rings, 6, 7
... bearing, 8 ... shaft, 9, 89 ... flange, 1
0, 90: rotor yoke, 11: magnet, 12: putty, 13, 93: mounting plate, 14: projecting piece, 13a: second
Hole, 13b: fixing portion, 13c: supporting claw, 81a: third
, 93a ... Press-fitting hole, 100 ... Press-fitting jig, 10
DESCRIPTION OF SYMBOLS 1 ... Base, 102 ... Pressing part, 103 ... Positioning pin, 1
04: pin for holding down, 105a: upper end of housing, 112a: driver IC, 112b: socket,
112c: Hall element.

Claims (14)

[Claims] 1. A housing having a step for holding a substrate and having at least a stator core fixed thereto; and a first hole which engages with the step of the housing to position the housing in the insertion direction and the rotation direction. A printed circuit board having the housing inserted into the first hole; and a second hole provided with a projecting piece for press-fitting the housing corresponding to the stepped portion. A mounting plate, wherein the housing inserted into the first hole is inserted into the second hole, and the printed circuit board is sandwiched and fixed between the step portion of the housing and the projecting piece. Brushless motor. 2. A housing having a step for holding a substrate and having at least a stator core fixed thereto, and a first hole which engages with the step of the housing to position the housing in the insertion direction and the rotation direction. A printed circuit board having the housing inserted into the first hole; and a second hole provided with a projecting piece for press-fitting the housing corresponding to the stepped portion. And a mounting plate in which the housing inserted into the first hole is press-fitted into the second hole, and the printed circuit board is sandwiched and fixed between the step portion of the housing and the protruding piece. Brushless motor. 3. The brushless motor according to claim 1, wherein a step portion of said housing sandwiching said printed circuit board and a projecting piece of said mounting plate are caulked and fixed. 4. The brushless motor according to claim 1, wherein the printed board includes a cutout for drawing out a lead wire drawn from a coil wound around the stator core to a back side, A brushless motor comprising: a relief portion for a step portion; a support portion on which the step portion of the housing is mounted; and a positioning portion for positioning the housing. 5. The brushless motor according to claim 4, wherein a state in which the support portion is arranged to face the relief portion via a rotating shaft is a pair, and n pairs of the support portions are arranged on the printed circuit board. And a brushless motor. 6. The brushless motor according to claim 1, wherein a support portion for supporting the printed circuit board is provided on the mounting plate, which is fixed by sandwiching the printed circuit board between the step portion of the housing and the projecting piece. A brushless motor characterized by being provided. 7. The brushless motor according to claim 4, wherein a positioning projection is provided on the housing in correspondence with the positioning section of the printed circuit board. 8. The brushless motor according to claim 1, further comprising a rotor yoke directly or indirectly supported by a shaft rotatably supported by said housing and having a hole formed on an upper surface thereof. Brushless motor. 9. The brushless motor according to claim 8, wherein said rotor yoke is directly press-fitted and fixed to said shaft. 10. A housing having a board holding step formed with a through hole for board positioning and a projection for press-fitting, and at least a stator core fixed thereto; and inserting the housing until it comes into contact with the step. And a third hole corresponding to the protrusion and the through-hole. The protrusion of the housing is inserted into the third hole, and the housing is inserted into the first hole. A printed circuit board; and a housing having a second hole provided with a projecting piece for press-fitting into the housing corresponding to a wall surface of the step portion and the projection, and inserted into the first hole of the printed circuit board. And a mounting plate in which the protruding piece is pressed into the inner wall surface of the protruding portion while inserting the second hole, and the printed circuit board is sandwiched and fixed between the step portion of the housing and the protruding piece. Characterized by Brushless motor. 11. The brushless motor according to claim 10, wherein a support tap hole is formed in the protrusion, and the support plate supports the support tap hole so that the projecting piece of the mounting plate is attached to the inner wall surface of the protrusion of the housing. A brushless motor characterized by being press-fitted. 12. The brushless motor according to claim 1, wherein the printed board has a component mounting surface and a soldering surface, and has a wiring pattern formed only on the soldering surface. A brushless motor characterized in that a magnet for frequency power generation that rotates about a rotation axis is arranged on the surface side, and a pattern for frequency power generation corresponding to the magnet for frequency power generation is formed on the soldering surface. . 13. A motor-incorporated device incorporating the brushless motor according to claim 1. 14. A base; an annular pressing portion protruding from the base; a positioning pin provided to protrude from the pressing portion; A press-in pin which operates independently of the press-fitting jig.