JP2002171715A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To install a wiring board direct on a motor without having a board holder interposed in-between. SOLUTION: The motor 1 has an opening formed in a sidewall of the motor case 3 thereof for an electrical connection with motor parts housed in the motor case 3. Opposite end portions of the opening are folded outward, to form a pair of folded portions 6 and 7. The pair of the folded portions 6 and 7 is used as board-holding portions for holding the wiring board 2. The pair of the folded portions 6 and 7 as the board-holding portions is formed, so that both the side edges of the wiring board 2 can be clamped by elastic force. Further, the folded portions 6 and 7 and the wiring board 2 are engaged with each other, and thereby arrest the movement of the wiring board in the direction orthogonal, on one and the same plane, to the direction in which the board holding portions clamp the wiring board and the movement of the wiring board 2 toward the opening 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having an improved mounting portion for a wiring board connected to a coil portion.

[0002]

2. Description of the Related Art Generally, a wiring board for supplying power to a coil portion of a motor is mounted by fixing a resin board holder on a side wall of a cylindrical motor case and fixing the board to the board holder. It is.

As described above, when the wiring board is mounted via the board holder, when an external force is applied to the motor case or the like, the external force is received by the board holder, and the external force is hard to be directly applied to the wiring board itself. There are advantages that the substrate is less likely to crack or break, and that the mounting position can be easily determined without using a special jig when mounting the wiring substrate.

[0004]

However, on the other hand, parts as a substrate holder are required, which leads to an increase in cost due to an increase in the number of parts and an increase in the number of assembling steps.

[0005] Therefore, the present invention enables a wiring board to be directly attached to a motor case without using a board holder.
The number of parts and the number of assembly steps can be reduced, and even if external force is applied to the motor case, etc., it is difficult to directly transmit the external force to the wiring board, preventing damage to the wiring board and improving durability. It also aims to provide an excellent motor.

[0006]

In order to achieve the above object, a motor according to the present invention has a motor case in which an opening for attaching a wiring board for making electrical connection to a motor component housed in the motor case is provided. In the motor formed on the side wall of the motor case, the opposing ends of the motor case side wall forming the opening are bent outward to form a pair of bent portions, and the pair of bent portions is a substrate holding the wiring board. It is a holding part.

As described above, in the motor of the present invention, opposite ends of the opening formed in the motor case are bent outward to form a pair of bent portions, and the pair of bent portions is used as a substrate holding portion. This eliminates the need to attach a circuit board holder to the motor and attach a circuit board to the circuit board holder, as in the past, when mounting the wiring board to the motor, reducing the number of parts and reducing the number of assembly steps. As a result, the cost of the motor can be reduced.

According to another aspect of the present invention, in the motor described above, the board holding portion is formed so as to be able to hold both sides of the wiring board. As described above, when the board holding portion (a pair of bent portions) is formed so as to be able to sandwich both sides of the wiring board, components such as screws are not required when the wiring board is attached to the board holding portion. Therefore, the number of parts and the number of assembly steps can be further reduced. Also, when an external force is applied to the motor case etc., the external force is absorbed by the bent part as the board holding part, so it is difficult for the external force to be directly transmitted to the wiring board, and the wiring board is damaged due to the external force applied to the motor case Less to do.

According to another aspect of the present invention, in the motor described above, the wiring board regulates a movement of the wiring board in at least one of directions perpendicular to the same plane as the direction in which the board holding portion holds the wiring board. It is characterized in that it has a mating portion and an engaging portion that engages with the substrate holding portion. With this configuration, the positioning when mounting the wiring board is easy, and the wiring board does not easily move after the mounting, so that problems such as disconnection can be prevented.

According to another aspect of the present invention, in the above-described motor, the engaging portion is configured to sandwich the substrate holding portion from both sides. For this reason, it is possible to prevent the position of the distribution board from shifting in a direction orthogonal to the same plane as the holding direction of the board holding unit with respect to the wiring board.

According to another aspect of the present invention, in the above-described motor, one of the portions of the board holding portion that engages with the engaging portion of the wiring board is formed by a U-shaped groove. For this reason, fitting during assembly becomes easier.

According to another aspect of the present invention, in each of the above-described motors, the board holding section and the wiring board are restricted from moving in the direction of the opening of the wiring board so that a constant distance is provided between the wiring board and the opening. It is characterized by having an engaging portion for forming. Therefore, positioning in the direction of the opening at the time of mounting the wiring board becomes easy.

According to another aspect of the present invention, in the above-described motor, the fixed gap formed between the wiring board and the opening exists between the surface of the wiring board on the opening side and the opening. It is characterized in that the wiring board has such a size that the surface on the opening side of the wiring board does not press against the wiring section. With this configuration, the surface on the opening side of the wiring board does not press against the wiring part existing between the surface on the opening side of the wiring board and the opening. It is possible to prevent any trouble such as disconnection of the wiring portion.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a motor according to the present invention will be described with reference to two examples of a first embodiment and a second embodiment.

[First Embodiment] FIG. 1 is an external configuration diagram illustrating a motor (hereinafter referred to as a stepping motor) according to a first embodiment of the present invention. FIG. 1A shows a wiring board 2 (FIG. 3).
Plan view of the motor 1 before the motor 1 is mounted (see (B)).
(A) is a diagram viewed from the direction of the arrow y, and (C) is a diagram of (A) viewed from the direction of the arrow x.

In FIG. 1, an external configuration of the motor 1 is composed of a motor case 3 and a rotating shaft 4 protruding from the motor case 3. The motor case 3 includes a rotor, a stator, and the like, but these are omitted in FIG.

The motor case 3 is formed in a cylindrical shape by a deep drawing press process or a curling process, and an opening 5 for mounting a wiring board is formed in the cylindrical side wall portion. A pair of bent portions 6 and 7 are formed in the opening 5 by bending the opposite ends of the side wall of the motor case 3 forming the opening 5 outward. Is used as a substrate holder.

The shape of the pair of bent portions 6 and 7 is shown in FIG.
As can be seen from (C), steps 6a, 7a are formed, and the steps 6a, 7a have a convex shape having projections 6b, 7b at the center. Note that FIG.
(A) is a view as seen from the direction of the arrow x, so only the bent portion 7 is shown, but the bent portion 6 also has the same shape. The protruding portions 6b of the substrate support portions 6, 7
The distance between the opposing surfaces of the projection 7b and the projection 7b is d, and the axial length of the rotation shaft 4 of the projections 6b and 7b is L1.

FIG. 2 is a view showing an external configuration of the motor 1 to which the wiring board 2 is attached, (A) is a view showing a state where the wiring board 2 is attached in FIG. 1 (A),
1B is a diagram illustrating a state where the wiring board 2 is attached in FIG. 1B, and FIG. 1C is a diagram illustrating a state where the wiring board 2 is attached in FIG. 1C.

As can be seen from FIG. 2, the wiring board 2
Are mounted on the bent portions 6 and 7 as a substrate holding portion so as to cover the opening 5 (see FIG. 1) formed in the motor case 3. The wiring board 2 has terminal pin mounting holes 9 for inserting terminal pins 8 protruding from the motor 1 side and fixing the terminal pins 8 by soldering or the like, and a power supply for supplying power to the motor 1. Connection line 10
There is provided a connection line passing hole 11 for feeding power through which the power supply passes.

FIG. 3 is a view showing the wiring board 2 taken out and shown. The wiring board 2 has a quadrangular shape as a whole, and the two side portions 12 and 13 have the above-mentioned convex substrate supporting portion 6. Notches 12 which engage the projections 6b, 7b of the
a and 13a are formed, and as described in FIG. 2, the terminal pin mounting hole 9 and the power supply connection line passing hole 11 are provided. Note that the notch recesses 12a, 1 of the wiring board 2
The width of the portion where 3a is formed is w, and the axial length of the rotary shaft 4 of the notch recesses 12a and 13a is L2.

When the wiring board 2 is mounted on the motor 1, the notch recesses 12 a, 13
a toward the opening 5 so that the power supply board 2 faces the opening 5 so that the power supply board 2 faces the protrusions 6 b and 7 b of the bent portions 6 and 7.
Is fitted so as to cover.

At this time, the distance d (see FIG. 1) between the protruding portions 6b and the protruding portions 7b in the bent portions 6 and 7 and the width w of the portion of the wiring board 2 where the notched concave portions 12a and 13a are formed (see FIG. 3). D) is set so that d is slightly smaller than w. Also, each of the protrusions 6b,
The relationship between L1 (see FIG. 1) in the axial direction of the rotary shaft 4 of the rotary shaft 7b and L2 (see FIG. 3) in the axial direction of the rotary shaft 4 of the notch recesses 12a and 13a is substantially equal. ,
L1 is slightly smaller than L2.

As a result, the notch recesses 12a, 13a of the wiring board 2 have the projections 6b, 7 of the bent portions 6, 7.
b, the notches 12a, 13a are engaged so as to push outward the projections 6b, 7b of the bent portions 6, 7, and are held by the restoring force of the projections 6b, 7b. Held in state. Thereby, the wiring board 2
Are the wiring boards 2 of the protruding parts 6b, 7b of the board holding parts 6, 7.
In the direction perpendicular to the same plane as the clamping direction with respect to, that is, in the axial direction of the rotating shaft 4 of the motor 1 (direction yy 'in FIG. 2A), the
The position is maintained in the y 'direction.

When the wiring board 2 is sandwiched by the protruding portions 6b and 7b of the bent portions 6 and 7, the wiring board 2 is held by the side portions 12 and 13 by the step portions 6a and 7a of the bent portions 6 and 7. Is supported in a state where it is received.

As a result, the movement of the wiring board 2 toward the opening 5 is prevented, so that a constant distance is maintained between the back surface of the wiring board 2 (the surface facing the opening 5) and the opening 5. Is generated.

As described above, by forming a fixed interval s between the back surface of the wiring board 2 and the opening 5, even if the wiring board 2 is attached to the bent portions 6 and 7, A space is formed between the opening 5 and the opening 5 by the distance s. Thus, when the wiring board 2 is attached to the bent portions 6 and 7, the wiring board 2 does not press the wiring portion existing between the back surface of the wiring board 2 and the opening 5, and Disconnection can be prevented beforehand. This will be described with reference to FIG.

FIG. 4 is a partial sectional view of FIG. 2 (C), in which a rotor 21 and a rotor 2
There is a stator 22 provided on the outer periphery of the first. The rotor 21 is a magnet holder 2 to which the rotating shaft 4 is attached.
3 and a magnet 24 attached to the outer periphery of the magnet holder 23. The stator 22 includes a coil 25, a coil bobbin 26 around which the coil 25 is wound, a yoke 27 holding the coil bobbin 26, and the like. Further, as described with reference to FIG. 2, the connection pins 8 for connecting the coil 25 and the wiring board 2 are provided on the stator 22.

The connection pin 8 has its lower end buried in the coil bobbin 26 and its tip end protruding outward from the opening 5 of the motor case 3. A connection wire 25 a from the coil 25 is wound around and connected to the connection pin 8 near the base of the coil bobbin 26, and the distal end of the connection pin 8 penetrates through the connection pin mounting hole 9 of the wiring board 2. Installed with. Then, the wiring substrate 2 is fixed from the front side by soldering or the like. As a result, the coil 25 and the wiring board 2 are electrically connected.

A connection line 10 for power supply is fixed to the wiring board 2 on the back side of the wiring board 2 by soldering or the like. The connection of the power supply connection line 10 to the wiring board 2 is not limited to the connection by soldering. For example, a connector may be mounted on a board and the power supply connection line may be mounted on the connector. Good.

By the way, as can be seen from FIG.
The wiring board 2 is prevented from moving in the direction toward the opening 5 by the step portions 6a and 7a (only the bent portion 6 is shown in FIG. 4) of the bent portions 6 and 7 as the substrate holding portions. Have been.

Thus, as described above, a fixed interval s is formed between the back surface of the wiring board 2 and the opening 5. The interval s serves to protect a wiring portion existing on the rear surface side of the wiring board 2. That is, this interval s
Is present, the circuit board 2 does not move further toward the opening 5, so that the connection line 25a connected to the connection pin 8 and the power supply connection line 10 are not pressed, and the wiring board 2 Disconnection by pressing these connection lines 25a and the power supply connection line 10 can be prevented beforehand.

In the present embodiment, the motor case 3
Since the wiring boards 2 are directly held by the bent portions 6 and 7 provided on the side, there is no need to prepare a separate board holder for holding the wiring board 2 as in the related art. The number of points and the number of assembling steps can be reduced. Further, since the wiring board 2 is positioned at an appropriate mounting position only by attaching the wiring board 2 to the bent sections 6 and 7 as the board holding sections, the assembly is easy and the productivity is improved. As a result, the cost of the motor can be reduced.

[Second Embodiment] Next, a second embodiment of the present invention will be described.
An embodiment will be described. In the description of the second embodiment, the same reference numerals are used for parts having the same functions as those of the above-described first embodiment.

FIG. 5 is an external configuration diagram illustrating a motor according to a second embodiment of the present invention (also a stepping motor in this second embodiment). FIG. FIG. 6 (B) is a plan view of (A) viewed from the direction of arrow y, and FIG.
(C) is a diagram of (A) viewed from the direction of the arrow x.

As in the first embodiment, the motor case 3 is formed in a cylindrical shape by deep drawing pressing or curling, and the motor case 3 is formed on the side wall of the cylindrical shape. Then, an opening 5 for attaching a wiring board is formed. The opening 5 is formed with a pair of bent portions 6 and 7 formed by bending opposite ends of side walls forming the opening 5 outward, respectively. Used as Further, a connection pin 8 connected to a coil (not shown) is provided from the opening 5 so as to protrude outward.

The bent portions 6 and 7 as the substrate holding portions in the second embodiment are slightly different in shape from those in the first embodiment, and as can be seen from FIG. It has a substantially quadrangular shape, and concave portions 6c and 7c for supporting the wiring board 2 are formed at opposite positions on the rear side (the rear side of the motor 1) so as to face each other. The recesses 6c and 7c are formed at a fixed distance s from the opening 5 of the motor case 3. FIG.
FIG. 5C is a view of FIG. 5A viewed from the direction of the arrow x. Therefore, only the bent portion 7 is shown as the substrate holding portion, but the bent portion 6 has the same shape. In addition,
The distance between the opposing surfaces of the bent portions 6 and 7 is d, and the respective recesses 6 of the bent portions 6 and 7 are
Let L1 be the length from the abutting walls of c and 7c to the front side of the bent portions 6 and 7.

As shown in FIG. 6, the wiring board 2 according to the second embodiment has the bent portions 6 and 7 at the two side portions 12 and 13 similarly to the first embodiment. Notch recesses 12a and 13a are formed so as to engage with each other.
Are slightly different from each other in the position of the connection pin mounting hole 9 through which the hole is inserted. The notch recesses 12a, 13 of the wiring board 2
The width of the portion where a is formed is w, and the axial length of the rotary shaft 4 of each of the notch recesses 12a and 13a is L2.

In the second embodiment, the power supply connection line 10 is not connected to the wiring board 2 by soldering or the like.
(See FIG. 7) to connect to the connector 30.

Incidentally, the length L1 from the abutting wall of each of the concave portions 6c and 7c of the bent portions 6 and 7 to the front side of the bent portions 6 and 7 is equal to the length L2 of the cutout concave portion of the wiring board 2. The length is substantially the same or slightly shorter than this, and this portion is formed by the cutout recesses 12a,
13a so as to be engaged with each other.
At this time, the wiring board 2 has its protruding sides 12b, 13b
The state is sandwiched between the concave portions 6c and 7c of the bent portions 6 and 7. The length d between the bent portions 6 and 7 is set to be slightly smaller than w of the portion of the power supply substrate 2 where the cutout concave portion is formed.

When the wiring board 2 as shown in FIG. 6 is attached to the motor 1 on which the bent portions 6 and 7 as the board holding sections are formed, as shown by a broken line in FIG. 2 is slanted, and first, the bending parts 6, 7
The notched recesses 12a, 13a of the wiring board 2 are provided in the recessed portions 6c, 7c provided on the rear end side, and the projecting sides 12b,
13b, the notch 1 of the wiring board 2 is rotated by rotating the wiring board 2 in the direction of the arrow z with the portion where the wiring board 2 is held as a fulcrum.
The bent portions 6 and 7 are fitted to 2a and 13a, and the two are engaged.

At this time, the wiring board 2 is engaged with the notched concave portions 12 a and 13 a so as to push the bent portions 6 and 7 outward, and is held by the returning force of the bent portions 6 and 7. Will be retained.

FIG. 8 shows a state in which the wiring board 2 is attached to the bent portions 6 and 7 of the motor 1. FIG. 8A shows a state in which the wiring board 2 is attached in FIG. FIG. 5B is a diagram showing a state where the wiring board 2 is attached in FIG.

After such a state, the wiring board 2
The connection pins 8 penetrating through the connection pin mounting holes 9 are soldered and connection wires (not shown) for power supply are provided on the connector 30 provided on the wiring board 2.
, The wiring board 2 and the motor 1 are electrically connected.

In the state shown in FIGS. 8A and 8B, as described above, the wiring board 2 has the cutout recesses 12a, 1a.
3a is engaged so as to push the bent portions 6 and 7 outward, and is held in a state sandwiched by the return force of the bent portions 6 and 7, so that the wiring board 2 is
7 is a direction orthogonal to the holding plane with respect to the wiring board 2 on the same plane, that is, the axial direction of the rotating shaft 4 of the motor 1 (FIG. 8).
The movement of the wiring board 2 in the yy ′ direction is prevented, and the position of the wiring board 2 in the yy ′ direction is maintained.

In this state, the wiring board 2 is provided with the concave portions 6c, 7c provided at the rear ends of the bent portions 6, 7.
The notch recesses 12a, 1
It is supported with the protruding sides 12b, 13b of 3a sandwiched.

As a result, movement toward the direction of the opening 5 of the wiring board 2 is prevented, whereby a certain distance is maintained between the back surface of the wiring board 2 (the surface facing the opening 5) and the opening 5. Is generated.

As described above, by forming a fixed interval s between the back side of the wiring board 2 and the opening 5, even if the wiring board 2 is attached to the bent portions 6 and 7, Since a space is formed between the opening 5 and the connection line 25a connected to the connection pin 8 and the power supply connection line (not shown), the wiring board 2 does not squeeze the connection line. Disconnection due to pressing the connection line 25a or the power supply connection line 10 can be prevented beforehand.

As described above, the second embodiment is slightly different from the first embodiment in the shape of the bent portions 6 and 7 for holding the wiring board 2 and how to attach and hold the same. The same effect as in the first embodiment can be obtained.

The above embodiment is an example of a preferred embodiment of the present invention, but the present invention is not limited to this, and various modifications can be made without departing from the gist of the present invention. is there. For example, the shapes of the bent portions 6 and 7 as the substrate holding portions, the shape of the wiring board, and the engaging portions for engaging the two can be variously deformed. Further, in each of the above-described embodiments, a stepping motor has been described as an example of a motor, but it is needless to say that the present invention can be applied to other motors.

[0051]

As described above, in the motor according to the present invention, the opposite ends of the opening formed in the motor case are bent outward to form a pair of bent portions, and the pair of bent portions is formed. Since it is a board holding part, when mounting the wiring board to the motor, it is not necessary to mount the board holder on the motor side and mount the wiring board on the board holder as in the conventional case, and the number of parts can be reduced. The number of assembling steps can be reduced, so that the cost of the motor can be reduced.

[Brief description of the drawings]

1A and 1B are external configuration diagrams illustrating a first embodiment of a motor before a wiring board is attached, wherein FIG. 1A is a plan view and FIG. 1B is a rear view of FIG. Figure,
(C) is a side view of (A) viewed from the direction of the arrow x.

FIG. 2 shows the first motor after a wiring board is attached.
1A is a plan view, FIG. 2B is a rear view of FIG. 1A viewed from the direction of an arrow y, and FIG.
(C) is a side view of (A) viewed from the direction of the arrow x.

FIG. 3 is a plan view of a wiring board used in the first embodiment.

FIG. 4 is a partial cross-sectional view of FIG. 2 (C).

5A and 5B are external configuration diagrams illustrating a second embodiment of a motor before a wiring board is attached, wherein FIG. 5A is a plan view and FIG. 5B is a rear view of FIG. Figure,
(C) is a side view of (A) viewed from the direction of the arrow x.

FIG. 6 is a plan view of a wiring board used in a second embodiment.

FIG. 7 is a diagram illustrating how to attach a wiring board to a board holding section (bending sections 6, 7) according to the second embodiment.

FIG. 8 shows the second motor after the wiring board is attached.
1A is a plan view, and FIG. 2B is a rear view of FIG. 1A as viewed from the direction of arrow y.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Wiring board 3 Motor case 4 Rotating shaft 5 Opening 6, 7 Bending part (board holding part) 6a, 7a Step part 6b, 7b Projection part 6c, 7c Concave part 8 Connection pin 9 Connection pin attachment hole 10 Power supply Connection line 25 Coil 25a Connection line from coil

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3J001 FA07 GA01 GA05 HA04 HA08 HA09 KA05 KA19 KB06 5E348 AA25 5H605 AA07 AA08 BB05 BB10 CC08 EC07

Claims (7)

[Claims] 1. A motor in which an opening for attaching a wiring board for making an electrical connection to a motor component housed in a motor case is formed in a side wall of the motor case, wherein the opening is formed. A motor, wherein opposite ends of a side wall of a motor case are bent outward to form a pair of bent portions, and the pair of bent portions is a board holding portion for holding the wiring board. 2. The motor according to claim 1, wherein the board holding portion is formed so as to be able to sandwich both sides of the wiring board. 3. The wiring board is an engaging portion that regulates the movement of the wiring board in at least one of directions perpendicular to the same plane as a direction in which the board holding section holds the wiring board. The motor according to claim 2, further comprising an engaging portion that engages with the portion. 4. The device according to claim 3, wherein the engaging portion is configured to sandwich the substrate holding portion from both sides.
Motor as described. 5. The motor according to claim 4, wherein one of the portions of the substrate holding portion that engages with the engaging portion of the wiring board is formed by a U-shaped groove. 6. An engagement portion for restricting movement of the substrate holding portion and the wiring board in the opening direction of the wiring substrate so as to form a fixed distance between the wiring substrate and the opening portion. 6. The method according to claim 1, wherein:
Motor according to the item. 7. A fixed interval formed between the wiring board and the opening corresponds to a wiring portion existing between the surface of the wiring board on the opening side and the opening. 7. The motor according to claim 6, wherein the surface of the substrate on the opening side has a size such that the surface does not come into pressure contact with the substrate.