JP2002320361A - Brush type power supply and dc brush motor comprising it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush type power supply required for providing an easy- to-assemble and inexpensive DC brush motor, and a DC brush motor comprising the brush type power supply. SOLUTION: In the DC brush motor, a fixing hole 20a is made at a position of a motor case 20 corresponding to the outer radial direction of a commutator 28 and a sub-assembled brush type power supply 1 independent from the motor body is fixed directly to the motor case 20 through the fixing hole 20a and then secured in place by means of a clip 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a direct current brush motor, and more particularly, to a structure for mounting a brush type power supply device including a brush on a motor body.

[0002]

2. Description of the Related Art Conventionally, for example, JP-A-2001-371
No. 66, etc., a motor case, a shaft rotatably disposed in the motor case,
2. Description of the Related Art There is known a DC brush motor that has a shaft and a brush that comes into contact with a commutator that rotates integrally with the shaft, and is driven and supplied with power from outside by the brush.

In this publication, a brush is housed in a holder formed on a partition plate, and the partition plate with the holder is fixed in a motor case, and one end of the brush is attached to the outer end of the motor case. There is disclosed a technique which employs a structure in which the other end of a separate spring locked to the brush is engaged to bias the brush in a radially inward direction.

[0004]

However, in the DC brush motor described in the above publication, a motor case,
It is necessary to prepare a partition plate with a holder according to a motor size such as a commutator size, and a new design of a partition plate with a holder is required each time a request for changing the motor size is made. Therefore, there was a problem of an increase in development and manufacturing costs.

Since the spring for biasing the brush in the radial direction is separate from the partition plate with the holder, after the partition plate with the holder is fixed to the motor case, the brush is inserted into the holder. A complicated assembling process such as attaching a spring is required, and there has been a problem of an increase in assembling cost.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a brush power supply device for providing a DC brush motor that is inexpensive and easy to assemble, and a DC brush using the brush power supply device. It is a technical object to provide a motor.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a brush connected to a power supply path for supplying power from the outside, a holder accommodating the brush in a reciprocating manner, A sub-assembly having biasing means disposed and biasing the brush in a direction protruding from the holder, and projecting amount limiting means for limiting the projecting amount of the brush from the holder; Brush-type power supply device. Here, the term “sub-assembly” means that the brush-type power supply device itself can be maintained as a single assembly before being assembled to the DC brush motor.

According to the brush type power supply device of the present invention,
The brush is constantly urged in the direction in which the brush protrudes from the holder by the urging force of the urging means provided inside the holder. However, since the amount of protrusion of the brush from the holder is restricted by the protrusion amount restricting means, the brush is Does not fall off the holder. Therefore, the brush-type power supply device itself can be subassembled independently. Therefore, in the assembly process of the DC brush motor, for example, after the assembly of the motor main body is completed, the assembly of the DC brush motor is performed only by attaching the separate and sub-assembled brush type power supply device according to the present invention from the outside. The mounting can be completed, and the mounting cost can be reduced.

When a request for changing the motor size is made due to a change in the required specifications of the motor or the like, one type of brush type power supply device according to the present invention is prepared, and this brush type power supply device is mounted. By designing while adjusting the size of each part of the motor body side, for example, the motor case, commutator, etc., it is possible to divert this one type of brush type power supply device while changing the motor size Becomes Therefore, the brush-type power supply device can be used for a variety of DC brush motors having a plurality of sizes, so that the development and manufacturing costs can be reduced.

[0010] More preferably, the protrusion amount limiting means includes:
It is desirable that the power supply path be configured by fixing a portion of the power supply path that is separated from the brush by a predetermined distance to the holder side. According to this, if at least the portion from the brush to the fixed position is formed of a deformable member such as a bundle of copper wires in the power supply path, the brush can reciprocate with respect to the holder, and the brush can be reciprocated. When the brush moves in the direction in which the brush protrudes from the holder, the brush cannot move with respect to the holder in a direction further protruding from the position where the power supply path is most extended. Therefore, the projection amount limiting means can be configured with a simple configuration in which a portion of the power supply path that is separated from the brush by a predetermined distance is fixed to the holder.

Further, the present invention has a motor case, a shaft rotatably disposed in the motor case, and a brush abutting on a commutator that rotates integrally with the shaft, and power is supplied from outside by the brush. In the driven DC brush motor, the motor case is provided with a mounting hole at a position corresponding to a radial direction of the commutator, and the holder in the above-described brush type power supply device is mounted on the mounting hole. DC brush motor. According to this, after the assembly of the motor main body is completed, the above-described separate and sub-assembled brush type power supply device is simply mounted from the outside using the mounting hole of the motor case, and the assembly of the DC brush motor is performed. The mounting can be completed, and the mounting cost of the DC brush motor as a whole can be reduced. Further, as described above, the brush-type power supply device can be generalized for variations of the DC brush motor having a plurality of sizes, so that the development and manufacturing costs can be reduced. Further, even when the number of brushes of the DC brush motor is changed (for example, from 2 to 4) or when the orientation angle of the brush is changed (for example, from 180 ° to 90 °), the brush orientation position in the motor case is changed. It suffices to provide mounting holes at the corresponding positions and prepare the required number of the same brush type power supply devices, so that it is easy to cope with various variations of the DC brush motor.

In the brush type power supply device of the DC brush motor, the holder includes a step portion which comes into contact with an outer surface of the motor case when the holder is inserted into a mounting hole from the outside to the inside of the motor case. An engaging portion is provided at a portion exposed inside the motor case in a state where the holder is inserted into the mounting hole from the outside to the inside of the motor case, and mounting and fixing the holder to the mounting hole, When the holder is inserted into the mounting hole from the outside of the motor case to the inside and the step portion and the outer surface of the motor case are in contact with each other, the engagement portion of the holder and the inner surface of the motor case are in contact with each other. It is preferable to use a clip that engages with the two and urges the two in a direction away from each other. According to this, the clip generates an urging force for urging the holder engaging portion, and eventually the holder body in the radially inward direction, with respect to the inner surface of the motor case. The contact state can be maintained, and the separate brush-type power supply device can be securely attached and fixed to the motor case main body. Further, when attaching and fixing the brush type power supply device separately and sub-assembled to the motor body, it is only necessary to add a clip as a component, and a step portion and an engagement portion provided on the holder are provided. When the holder body is manufactured by resin molding or the like, it can be integrally formed at the same time, so that the brush-type power supply device can be securely mounted and fixed to the motor case with an inexpensive and simple configuration.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. First, a mechanical configuration of a single brush type power supply device (sub-assembly) according to an embodiment of the present invention will be described with reference to FIG. Here, FIG.
FIG. 1A is a cross-sectional view as viewed from the front, and FIG.
FIG. 2 is a right side view (including a partial cross-sectional view) of FIG.

In the brush type power supply device 1 shown in FIG.
The holder 3 is made of an insulator, and is roughly in the axial direction (FIG. 1).
(In the vertical direction), a stepped quadrangular prism having a stepped portion 3c is provided, and a through-hole 3a having a square cross section is provided symmetrically with respect to the axial direction. Such a step 3c
Is a brush type power supply device 1 to be described later in a motor case 2
When the brush type power supply device 1 is inserted into the mounting hole 20a of the motor case 20, the brush type power feeding device 1 is brought into contact with the outer surface of the motor case 20.
It is provided for fixing to. The holder 3 is provided with the brush type power supply device 1 in a motor case 2 described later.
Grooves 3b (engaging portions) for engaging a clip 34, which will be described later, are provided on the left and right surfaces of a portion exposed inside the motor case 20 when inserted into the 0 mounting hole 20a. In the through hole 3a of the holder 3, a terminal 9 made of a conductor and having a substantially thin rectangular column shape is inserted and fitted.

The terminal 9 made of a conductor is shown in FIG.
In (a), a range of 4 from the upper end within a predetermined distance
Two of the side surfaces are separated from each other, and
The left side surface 9c in FIG. 1A of the side surfaces is bent outward (to the left in FIG. 1A). Also,
In FIG. 1A, which is the other of the two side surfaces, a U-shaped notch is provided from the end of the front side surface 9d in the drawing. side)
It is bent. The front side 9d
Has also a function as a seat surface for supporting one end of a spring 7 (biasing means) described later. The remaining two sides 9a and 9b that are not separated have an L-shape when viewed from above in FIG. Further, the terminal 9 is located on the left and right surfaces near the lower end in FIG.
It has a lead portion 9e that extends upward from below. The terminal 9 is brought into contact with the holder 3 by the contact between the left side surface 9 c bent outward and the upper end surface of the holder 3 and the contact between the distal end portion of the lead portion 9 e and the lower end surface of the holder 3. On the other hand, it is securely fixed in the vertical direction.

The brush 5 has a quadrangular prism shape made of a conductor, and is accommodated in the terminal 9 so as to be able to reciprocate. On the upper end side of the brush 5 in FIG. 1A, one end of a copper wire bundle 13 (power supply path) having a predetermined length is fixed, and the other end of the copper wire bundle 13 is formed as described above. The terminal 9 is spot-welded at a point B on the surface 9b of the terminal 9 through a U-shaped notch provided on the front side surface 9d of the terminal 9 in the drawing. This allows
The brush 5 can reciprocate in the terminal 9, and when the brush 5 moves in a direction in which the brush 5 protrudes from the holder 3 (downward in FIG. 1), a bundle 13 of copper wires
Cannot move in a direction further protruding from the most extended state position. Therefore, the brush 5 does not fall off the holder 3, and the amount of protrusion of the brush 5 from the holder 3 is limited. That is, the protruding amount limiting means includes a bundle 13 of copper wires having one end fixed to the brush 5 and having a predetermined length.
Is spot-welded onto the surface 9b of the terminal 9.

The springs 7 (biasing means) are arranged so as to surround the copper wire bundle 13 in the terminal 9, and both end surfaces thereof are located in front of the above-mentioned terminal 9 which is bent inward. Side surface 9d and upper surface 5 of brush 5
b. Therefore, the spring 7 is
Is always urged in a direction to protrude with respect to the holder 3.
This urging force is used to ensure that the distal end surface 5a of the brush 5 abuts against the commutator 28 described later when the brush type power supply device 1 is attached to the motor body, and to ensure reliable conductivity. Is done.

The distal end of the bundle of copper wires 15a in the harness 15 (power supply path) for supplying power from the outside is spot-welded at the point A on the surface 9a of the terminal 9 described above. Therefore, the power supply path of the present brush-type power supply device 1 is constituted by the harness 15, the spot weld A, the terminal 9 made of a conductor, the spot weld B, and the bundle 13 of copper wires, and supplied from the outside. Electric power is supplied to the brush 5 via the power supply path.

The resin cover 11 is provided on the outer surface of the holder 3 so as to cover the entire portion of the holder 3 exposed to the outside when the brush type power supply device 1 is inserted into a mounting hole 20a of a motor case 20 described later. It is arranged. A seal portion 11 a is provided in a portion of the cover 11 that comes into contact with the outer peripheral surface of the motor case 20, and the seal portion 11 a cooperates with the outer peripheral surface of the motor case 20 to
It is possible to prevent dust and water from entering the inside of the motor case 20 from the outside.

The mechanical configuration of the single brush type power supply device according to the embodiment of the present invention has been described above with reference to FIG. As described above, the brush type power supply device 1 itself is sub-assembled as a single unit.

Next, referring to FIG. 2, the brush type power supply device 1 shown in FIG.
The mechanical configuration of the DC brush motor according to the first embodiment of the present invention used for a 0 ° 4-pole DC brush motor will be briefly described. Here, FIG. 2A is a cross-sectional view of FIG.
FIG. 2B is a cross-sectional view of FIG. 2A, and FIG. 2B is a cross-sectional view of FIG.

In FIG. 2, a motor case 20 made of a conductive material has a substantially cylindrical shape.
0, bearings 24 fixed to both ends of the inside,
The shaft 22 is supported by the motor case 20.
It is rotatably supported inside.

The commutator 28 is integrally fixed to the shaft 22 so as to rotate integrally with the shaft 22.

The coil 30 is also integrally fixed to the shaft 22 coaxially with the commutator 28.
It is designed to rotate integrally with. The coil 30
It is electrically connected to the commutator 28.

The magnet 32 has a partially cylindrical shape, and four magnets 32 are equidistantly arranged at 90 ° on the inner peripheral surface of the motor case 20 and are positioned at their axial positions facing the coil 30. It is fixed by magnetic force. The four magnets 32 are magnetized in the radial direction, and the coils 30
The inner peripheral surfaces of the magnets 32 facing each other are arranged such that N poles and S poles alternately appear in the circumferential direction.

The motor case 20 has a commutator 28
At two positions corresponding to the radially outward direction, there is a rectangular mounting hole 20a for mounting the above-mentioned brush type power supply device 1 with a 90 ° orientation angle as shown in FIG. Is provided. The phase in the circumferential direction in which the mounting holes 20a are provided matches the phase with respect to the center position of two of the four magnets 32 equally arranged at 90 ° described above arranged on the inner surface of the motor case 20. (Not shown). In each of the two through holes 20a, the above-described one type of brush type power supply device 1 shown in FIG.
Are inserted and fixed in a radially inward direction, and are arranged such that the end face 5 a of the brush 5 abuts on the outer peripheral surface of the commutator 28 when the spring 7 is slightly compressed. Therefore, the brush 5 is constantly urged toward the commutator 28 by the urging force of the spring 7, and the electric power supplied from the outside is supplied to the above-described power supply path and the brush 5.
Through the commutator 28.

The fixing of the brush-type power supply device 1 to the motor case 20 after the insertion into the mounting hole 20a is performed when the step 3c of the holder 3 and the outer surface of the motor case 20 are in contact with each other. Clip 34 made of an elastic body having a character shape
2 are inserted into the two grooves 3b of the holder 3 described above from the right in FIG. 2B. That is, in the U-shaped clip 34, the middle portions of the two sides having the free ends at the ends are slightly raised in the same direction from the plane including the U-shape by a small amount. Accordingly, the two raised portions are directed radially outward, and the free end 2
In the state where the location is inserted into the two grooves 3b of the holder 3,
The two raised portions of the clip 34 come into contact with the inner surface of the motor case 20. Therefore,
The clip 34 generates an urging force for urging the groove 3b of the holder 3 and the motor case 20 in a direction away from each other. Is always energized. Therefore, the state in which the step 3c of the holder 3 and the outer surface of the motor case 20 are in contact with each other by the urging force of the clip 34 can be maintained. It is securely attached and fixed.

The mechanical configuration of the DC brush motor according to the first embodiment of the present invention has been briefly described above with reference to FIG. Next, referring to FIG. 3, the brush type power supply device 1 shown in FIG.
A mechanical configuration of a DC brush motor according to a second embodiment of the present invention used for a 0 ° two-pole DC brush motor will be briefly described. Here, FIG. 3A shows F-
FIG. 3B is a cross-sectional view of FIG. 3B, and FIG. 3B is a cross-sectional view of FIG. In FIG. 3, the same or equivalent members as those in FIG. 2 described above are denoted by the same reference numerals as those shown in FIG. 2, and redundant description will be omitted.

The main difference between the DC brush motor according to the second embodiment of the present invention shown in FIG. 3 and the DC brush motor according to the first embodiment of the present invention shown in FIG. 2 is that the brush orientation angle is 90 °. From 180 to 180 °, and the number of magnets 32 is changed from four to two, and these two magnets 32 are positioned on the inner surface of the motor case 20 in the circumferential position corresponding to the two brush orientation positions. Only the points (not shown) are arranged.

The mechanical structure of the DC brush motor according to the first and second embodiments of the present invention has been described above with reference to FIGS. Since the operation of the DC brush motor according to the first and second embodiments of the present invention is well known, the description thereof will be omitted.

The DC brush motor according to the first and second embodiments of the present invention has the following effects. First, the brush 5 is constantly urged in the direction in which the brush 5 protrudes from the holder 3 by the urging force of the spring 7 provided inside the holder 3.
The brush 5 does not fall off the holder 3 because the protrusion amount from the holder 3 is limited. Therefore, the brush type power supply device 1 itself can be sub-assembled independently.
Therefore, in the assembly process of the DC brush motor, after the assembly of the motor body is completed, the assembly of the DC brush motor can be completed only by attaching the sub-assembled brush type power supply device 1 from the outside, It is possible to reduce the assembly cost.

When there is a request to change the motor size due to a change in the required specifications of the motor or the like, one type of brush type power supply device 1 according to the present invention is prepared, and this brush type power supply device 1 is prepared. Of the motor body, for example, the motor case 20, the commutator 28,
By designing while adjusting the size such as the above, it becomes possible to divert the one type of brush type power supply device 1 while changing the motor size. Therefore, the brush-type power supply device 1 can be generalized for variations of a DC brush motor having a plurality of sizes.
Manufacturing costs can be reduced.

The protrusion amount limiting means, which is a point at which the brush type power supply device 1 is subassembled, is a brush 5
The other end of the bundle of copper wires 13 having a predetermined length, one end of which is fixed to the surface 9b of the terminal 9 is spot-welded. Therefore, the brush 5 in the power supply path
The protrusion amount limiting means can be configured with a simple configuration in which a part separated by a predetermined distance from the fixing member is fixed to the holder 3 side.

Further, even when the number of brushes of the DC brush motor is changed (for example, from 2 to 4) or when the orientation angle of the brush is changed (for example, from 180 ° to 90 °), the brush in the motor case 20 is not changed. It is sufficient to provide the mounting holes 20a at the positions corresponding to the orientation positions of, and to prepare the required number of the same brush type power supply devices 1.
It is easy to cope with various variations of the DC brush motor.

Mounting hole 20 of motor case 20 of holder 3
a for the attachment and fixing to the clip 3
4 generates an urging force to urge the inner surface of the motor case 20 into the groove 3b (engaging portion) of the holder 3 and thus the main body of the holder 3 in a radially inward direction. And the outer surface of the motor case 20 can be maintained in contact with each other, so that the separate brush-type power feeding device 1 can be securely attached and fixed to the motor case 20 main body. Therefore, when the separate and sub-assembled brush type power supply device 1 is attached and fixed to the motor main body, only the clip 34 needs to be added as a component, and the step portion 3c provided on the holder 3 is provided. And groove 3b (engaging portion)
When the main body of the holder 3 is formed by resin molding or the like, the holder 3 can be integrally molded at the same time, so that the brush type power supply device 1 can be securely mounted and fixed to the motor case 20 with a low-cost and simple configuration. it can.

In the DC brush motor described in the section of the prior art, a holder for accommodating a brush is formed on a partition plate, and the partition plate with the holder is fixed to the motor case. The mounting error between the circumferential phase of the magnet mounted on the inner surface and the circumferential phase of the brush tends to increase cumulatively. However, according to the DC brush motor according to the first and second embodiments of the present invention, since the holder 3 accommodating the brush 5 is directly attached and fixed to the motor case 20, it is mounted on the inner surface of the motor case 20. It is possible to minimize the accumulated assembly error between the circumferential phase of the magnet 32 and the circumferential phase of the brush 5 as much as possible. Therefore, it is possible to provide a DC brush motor that can exhibit various stable performances.

[0037]

As described above, according to the present invention,
A brush-equipped power supply device for providing an inexpensive and easily assembled DC brush motor and a DC brush motor using the brush-equipped power supply device can be provided.

[Brief description of the drawings]

FIG. 1 is a diagram showing a mechanical configuration of a brush-type power supply device according to an embodiment of the present invention. FIG. 1A is a cross-sectional view as viewed from the front, and FIG. 1B is a right side of FIG. FIG. 4 is a plan view (partly including a cross-sectional view).

FIG. 2 is a diagram showing a mechanical configuration of the DC brush motor according to the first embodiment of the present invention, and FIG.
2B is a sectional view taken along the line D-D in FIG.
It is C sectional drawing.

FIG. 3 is a diagram showing a mechanical configuration of a DC brush motor according to a second embodiment of the present invention, and FIG.
3B is a sectional view taken along line FF of FIG. 3, and FIG.
It is E sectional drawing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush-type power supply device 3 Holder 3b Groove (engaging part), 3c Step part 5 Brush 7 Spring (biasing means) 9 Terminal (power supply path) 13 Bundle of copper wires (power supply path) 15 Harness (power supply path) 20 Motor Case 20a Mounting hole 22 Shaft 28 Commutator 34 Clip

Continued on the front page F term (reference) 5H613 AA02 BB04 BB15 BB27 BB33 GA01 GA11 GA14 GA17 GB01 GB02 GB08 GB09 GB13 GB17 KK05 KK07 PP03 SS02 5H623 AA10 BB07 GG13 GG23 LL02 LL14

Claims (4)

[Claims] 1. A brush connected to a power supply path for supplying power from the outside, a holder accommodating the brush in a reciprocating manner, and a direction arranged inside the holder and protruding the brush from the holder. A brush-type power supply device that has a biasing unit that biases the brush and a protrusion amount limiting unit that limits the amount of protrusion of the brush from the holder, and is a sub-assembly by itself. 2. The brush type power supply device according to claim 1, wherein the protrusion amount limiting means fixes a portion of the power supply path which is separated from the brush by a predetermined distance to the holder side. 3. A direct-current power supply comprising: a motor case; a shaft rotatably disposed in the motor case; and a brush abutting on a commutator that rotates integrally with the shaft. 2. The brush motor according to claim 1, wherein the motor case is provided with a mounting hole at a position corresponding to a radially outward direction of the commutator.
A DC brush motor, wherein the holder in the brush-type power feeding device according to claim 2 is attached to the attachment hole. 4. The holder according to claim 3, wherein the holder has a stepped portion that comes into contact with an outer surface of the motor case when the holder is inserted into a mounting hole from the outside of the motor case to the inside. An engaging portion is provided at a portion exposed inside the motor case when inserted into the mounting hole from the outside to the inside of the motor case, and fixing the holder to the mounting hole includes fixing the holder to the mounting hole. When the stepped portion is inserted into the mounting hole from the outside to the inside of the motor case and the outer surface of the motor case is in contact with the stepped portion, the engaging portion of the holder and the inner surface of the motor case are engaged. A direct current brush motor, wherein the direct current brush motor is driven by a clip that urges the two together and separates them from each other.