JP4213312B2 - Motor feeding brush device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to motors power supply brush device.
[0002]
[Prior art]
As shown in FIG. 4, the brush 51 for supplying current to the commutator is accommodated in the brush holder 52 so as to be slidable back and forth, and is urged toward the commutator by a coil spring (not shown) accommodated in the brush holder 52. Yes.
[0003]
The brush 51 has a substantially rectangular parallelepiped shape, and a pigtail 53 is connected in the vicinity of the rear end portion of the upper surface. The current supplied from the power supply side through the pigtail 53 is supplied to the commutator by the brush 51.
[0004]
[Problems to be solved by the invention]
By the way, when trying to miniaturize the motor, the brush 51 needs to be miniaturized accordingly. In addition, with the downsizing of the brush 51, the cross-sectional shape of the pigtail 53 connected to the brush 51 needs to be reduced.
[0005]
However, when the cross-sectional shape of the pigtail 53 is reduced, the current that can be passed through the pigtail 53 decreases. As a result, there is a problem that the amount of power supplied to the commutator is reduced and the output of the motor is reduced.
[0006]
Further, when the brush 51 is downsized, the surface area of the brush 51 itself is reduced, and thus there is a problem that the heat dissipation effect is lowered.
The present invention was made to solve the above problems, and an object, can suppress reduction in the heat radiation effect of the motor power supply brush while realizing high-output motors in small makes the chromophore at the distal end It is to provide a data feeding brush device.
[0008]
[Means for Solving the Problems]
In order to solve the above problems, the invention according to claim 1 is a motor power supply brush for supplying current supplied via a pigtail to a commutator, and a holder substrate for guiding the motor power supply brush toward the commutator side. the motor power supply brush device comprising a brush holder provided on the motor power supply brushes has a width in a direction commutator of the brush body is in sliding contact, commutator side is formed narrower than the anti-commutator side, the commutator-side narrow portion at the commutator sliding contact to Rutotomoni of pigtail is attached to the wide portion of the anti-commutator side, the brush holder, slidably supporting the wide portion of the motor power supply brush at the lateral walls of the brush holder and the guide member is formed on one of the lateral walls, the width of the motor power supply brush at the guide member Parts so as to slidably supporting the said motor power supply brush, along with the narrow portion by cutting said guide member side in the width direction of the brush body is constructed, a surface of the anti-commutator side of the wide portion A gist of the invention is that the brush holder is obliquely formed so as to face a side of the side wall on which the guide member is formed, on both side walls .
[0009]
According to a second aspect of the invention, the motor power supply brush device of claim 1, the wide portion of the motor power supply brush is provided with an engaging section that engages with the guide member, engaged with the guide member The gist is that the further movement toward the commutator is restricted.
[0011]
(Function)
According to the first aspect of the present invention, the motor power supply brush has a width in the direction in which the commutator is in sliding contact with the commutator that is in sliding contact with the commutator, and is wide on the side opposite to the commutator to which the pigtail is attached. It is formed. The motor power supply brush is downsized on the side of the commutator that is in sliding contact with the commutator, so that the commutator is downsized and a small motor is realized. Furthermore, since a large-diameter pigtail can be attached to the wide anticommutator side, the amount of current supply can be increased, and a high output motor can be realized. Further, in the motor power supply brush formed with a narrow width on the commutator side and a wide width on the anti-commutator side, a reduction in surface area is suppressed, and a reduction in heat dissipation effect is suppressed. In the motor power supply brush, the wide portion is slidably supported by the side walls of the brush holder, and the narrow portion is slidably supported by the guide member formed on either one of the side walls. That is, the motor power supply brush is prevented from rattling in the sliding contact direction with the commutator.
[0012]
According to the second aspect of the present invention, when the engaging portion provided in the wide portion of the motor power supply brush engages with the guide member provided in the brush holder, the motor power supply brush moves to the further commutator side. Are restricted.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment embodying the present invention will be described with reference to FIGS.
1 and 2 are main part plan views of the motor power supply brush device 1, and the motor power supply brush device 1 has an annular shape with a commutator 2 disposed at the center thereof. A brush holder 12 made of metal (made of a brass plate in the present embodiment) is assembled on the holder substrate 11 of the motor power supply brush device 1.
[0014]
As shown in FIG. 1, the brush holder 12 is formed in a gate shape and includes a right side wall 12a, a left side wall 12b, and an upper wall 12c that connects the upper end portions of the right side wall 12a and the left side wall 12b. .
[0015]
A fixing portion 13 is formed to extend along the holder substrate 11 at the lower end portion of the right side wall 12a constituting the brush holder 12, and each of the fixing portion 13 is bent and connected to the commutator side end portion and the anti-commutator side end portion. 14a and 14b are formed. The both bent connecting pieces 14a and 14b are bent to the back surface of the holder substrate 11 through attachment holes 15a and notches 15b formed in the holder substrate 11, respectively.
[0016]
Further, a part of the opening end portion on the commutator side of the right side wall 12a is bent inward at a right angle to form a guide piece 16 as a guide member. That is, the guide piece 16 is formed to be narrower at the opening end portion on the commutator side of the brush holder 12 than the space formed by the right side wall 12a and the left side wall 12b.
[0017]
On the other hand, a bent connection piece (not shown) is formed at the lower end of the anticommutator side end of the left side wall 12b constituting the brush holder 12. The bent connection piece is bent to the back surface of the holder substrate 11 through an attachment hole 15 c formed in the holder substrate 11. That is, the brush holder 12 is connected and fixed to the holder substrate 11 by the bent connecting pieces. In addition, a holding fitting 17 that is bent upward is formed at the lower end of the middle portion of the left side wall 12b.
[0018]
Extending pieces 18 and 19 are formed to extend toward the anti-commutator side at the anti-commutator side ends of the right side wall 12a and the left side wall 12b, respectively. And the spring guide groove 20 is notched and formed in the anticommutator side end part of the right side wall 12a from the upper surface 18a of the base end part of the extension piece 18 toward the commutator side. Further, a spring locking projection 21 is formed to extend upward on the upper surface 18a of the distal end portion of the extending piece 18 of the right side wall 12a.
[0019]
A guide groove 22 is formed in the upper wall 12c connecting the upper ends of the both side walls 12a and 12b. The guide groove 22 is cut out from the non-commutator side toward the commutator side. Then, a brush 30 as a motor power supply brush is disposed in a space formed by the right side wall 12a, the left side wall 12b, the upper wall 12c, and the holder substrate 11.
[0020]
The brush 30 has a rectangular parallelepiped shape as shown in FIGS. 1 to 3, and one side (right side in FIG. 1) of the brush body is cut away. In the brush 30, the notched portion on the commutator side is a narrow portion 31, and the non-notched portion on the non-commutator side is a wide portion 32. The width of the narrow portion 31 (the direction in which the commutator 2 is in sliding contact and the width in the left-right direction in FIG. 1) is between the inner surface of the left side wall 12b and the front end surface of the guide piece 16 formed on the right side wall 12a. The width is set such that the narrow portion 31 of the brush 30 is in sliding contact and guided to the commutator side. Further, the width of the wide portion 32 (width in the left-right direction in FIG. 1) is guided to the commutator side by the wide portion 32 of the brush 30 slidably contacting between the inner side surface of the left side wall 12b and the inner side surface of the right side wall 12a. Is set to a width.
[0021]
Accordingly, the brush 30 has the left and right side surfaces of the narrow portion 31 supported by the left side wall 12b and the guide piece 16, respectively, while the left and right side surfaces of the wide portion 32 are supported by the left side wall 12b and the right side wall 12a, respectively. Will be guided to. As a result, the brush 30 is guided without rattling in the left-right direction. Further, when the surface 32 a as the commutator side engaging portion of the wide portion 32 is engaged with the guide piece 16, the further movement of the brush 30 toward the commutator side is restricted.
[0022]
A pigtail 33 supported by the holding metal fitting 17 is attached to the central portion of the upper surface 32 b of the wide portion 32. Further, the surface 32c of the wide portion 32 on the side opposite to the commutator is formed in an oblique shape so that the surface 32c faces the right side wall 12a, and the surface 32c moves the brush 30 to the commutator side by the coil torsion spring 40. It is being suppressed to make it happen.
[0023]
The coil torsion spring 40 is supported by a spring support pin 41 provided at a position adjacent to the brush holder 12 on the holder substrate 11, and the holder arm 40 a at one end engages with the spring locking protrusion 21. The brush arm 40b at the other end engages with the anti-commutator side surface 32c of the wide portion 32. The brush arm 40b of the coil torsion spring 40 is guided along the spring guide groove 20 formed in the right side wall 12a when the brush 30 is pressed toward the commutator.
[0024]
Next, the characteristics of the above embodiment will be described below.
(1) In the above embodiment, the shape of the brush 30 is narrow on the side of the commutator that is in sliding contact with the commutator 2 and wide on the side of the non-commutator to which the pigtail 33 is attached. Therefore, the commutator side of the brush 30 can be downsized, the commutator 2 can be downsized, and the diameter of the pigtail 33 can be increased. Therefore, the motor can be downsized, the current supply amount of the pigtail 33 can be increased, and the output of the motor can be improved.
[0025]
(2) In the above embodiment, the shape of the brush 30 is narrow on the side of the commutator that is in sliding contact with the commutator 2 and wide on the side opposite to the commutator to which the pigtail 33 is attached. It has been. That is, it is possible to suppress a decrease in the heat dissipation effect.
[0026]
(3) In the above embodiment, the guide piece 16 is formed at the open end of the right side wall 12 a of the brush holder 12 on the commutator side, and the tip surface thereof is formed so as to guide the narrow portion 31 of the brush 30. Therefore, the brush 30 is guided without shaking in the left-right direction, vibration generated in the brush 30 due to sliding contact with the commutator 2 can be suppressed, and stable current supply can be performed.
[0027]
(4) In the above embodiment, the guide piece 16 is formed at the open end of the right side wall 12 a of the brush holder 12 on the commutator side, and the surface 32 a of the wide portion 32 is engaged with the guide piece 16. The movement of the brush 30 toward the commutator is restricted. Therefore, the brush 30 can be prevented from falling off the brush holder 12, and the motor can be prevented from being damaged due to the brush 30 being dropped off.
[0028]
(5) In the above embodiment, a part of the guide piece 16 that guides the narrow portion 31 of the brush 30 and restricts the movement to the commutator side is provided at the opening end portion of the right side wall 12a of the brush holder 12 on the commutator side. Was bent at a right angle inside. That is, the guide piece 16 is integrally formed with the brush holder 12. Therefore, an increase in the number of parts can be prevented.
[0029]
(6) In the above embodiment, in order to bias the brush 30 toward the commutator side, the coil torsion spring 40 is disposed so as to be supported by the spring support pin 41 provided on the side of the brush holder 12. The holder arm 40a and the brush arm 40b extending from the coil torsion spring 40 are engaged with the spring locking protrusion 21 of the brush holder 12 and the surface 32c of the brush 30, respectively. That is, the space for parts arranged on the anti-commutator side of the brush 30 is reduced. Thereby, the space on the anti-commutator side of the brush 30 can be reduced, and the motor can be made smaller.
[0030]
(7) In the above embodiment, the spring guide groove 20 is notched toward the end of the right side wall 12a of the brush holder 12 toward the commutator side, and the tip of the extension piece 18 of the right side wall 12a is formed. A spring locking projection 21 is formed to extend upward on the upper surface 18a. Then, the holder arm 40a at one end of the coil torsion spring 40 supported by the spring support pin 41 is engaged with the spring engaging projection 21, and the brush arm 40b at the other end is engaged with the brush 30 to obtain the brush. When the arm 40b presses the brush 30 toward the commutator, it is guided along the spring guide groove 20. Therefore, the coil torsion spring 40 can urge the brush 30 toward the commutator side more reliably.
[0031]
(8) In the above-described embodiment, the anti-commutator side surface 32c of the wide portion 32 of the brush 30 is formed so as to be inclined so that the surface 32c faces the right side wall 12a, and the surface 32c is formed by the coil torsion spring 40. In order to move the brush 30 to the commutator side, the pressure is reduced. That is, the urging load direction of the brush arm 40b of the coil torsion spring 40 is closer to being perpendicular to the surface 32c. Thereby, the coil torsion spring 40 can transmit the biasing load to the brush 30 more efficiently.
[0032]
In addition, you may change the said embodiment as follows.
In the above-described embodiment, the brush 30 has two widths in the direction in which the commutator 2 is in sliding contact with the narrow portion 31 and the wide portion 32, but three or more types of widths may be set.
[0033]
In the above embodiment, the brush 30 is biased toward the commutator by the arms 40a and 40b extending from the coil torsion spring 40 supported by the spring support pin 41 provided on the side of the brush holder 12. However, a coil spring or the like may be provided on the anti-commutator side surface 32c of the wide portion 32 of the brush 30 to be urged. Even in this case, the same effects as the effects (1) to (4) of the above embodiment can be obtained.
[0034]
In the above embodiment, the coil torsion spring 40 is used to urge the brush 30. However, other urging means such as a leaf spring or a wire spring may be used.
Next, technical ideas that can be grasped from the embodiment and other examples described above are described below together with their effects.
[0035]
(1) before SL guide member, Ru guide pieces der that formed by bending one side wall of the commutator-side open end of the brush holder on the inside. In this case, since the guide member is integrally formed with the brush holder, an increase in the number of parts can be prevented.
[0036]
(2) pre-Symbol brush holder, a spring locking projection to one end engaging the coil torsion spring elastically presses the brush spring guide groove for guiding the brush holder abutting the other end of the coil torsion spring Were integrally formed . In this case, the coil torsion spring can urge the brush holder more reliably.
[0038]
【The invention's effect】
As described above in detail , according to the first aspect of the present invention, it is possible to provide a small and high-power motor and to suppress a reduction in the heat dissipation effect of the motor power supply brush. Since shakiness in the sliding contact direction with the commutator is prevented, stable current supply can be performed.
[0039]
According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, it is possible to prevent motor damage due to the motor power supply brush falling off from the brush holder.
[Brief description of the drawings]
FIG. 1 is a plan view showing a motor power supply brush device according to the present embodiment (a state where a motor power supply brush is not engaged with an engaging portion of a brush holder).
FIG. 2 is a plan view showing the motor power supply brush device (a state where the motor power supply brush is engaged with the engaging portion of the brush holder).
FIG. 3 is an enlarged perspective view showing the entire motor power supply brush.
FIG. 4 is an enlarged perspective view showing a motor power supply brush device in the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Motor power supply brush apparatus, 2 ... Commutator, 11 ... Holder board | substrate, 12 ... Brush holder, 12a ... Right side wall, 12b ... Left side wall, 16 ... Guide piece as guide member, 30 ... Brush as motor power supply brush, 31 ... narrow part, 32 ... wide part, 32a ... surface as an engaging part, 33 ... pigtail.

Claims (2)

In a motor power supply brush device comprising a motor power supply brush for supplying current supplied via a pigtail to a commutator and a brush holder provided on a holder substrate for guiding the motor power supply brush toward the commutator side,
The width of the motor power supply brush in the direction in which the commutator of the brush body is in sliding contact is formed so that the commutator side is narrower than the anti-commutator side. Pigtail is attached to the wide part,
The brush holder slidably supports the wide portion of the motor power supply brush on both side walls of the brush holder, and a guide member is formed on either side wall, and the width of the motor power supply brush is reduced by the guide member. To support the sliding part,
The motor power supply brush is configured such that the narrow member is formed by cutting out the guide member side in the width direction of the brush body, and the anticommutator side surface of the wide portion is the side wall of the brush holder. A motor power supply brush device formed obliquely so as to face the side of the side wall on which the guide member is formed. The motor power supply brush device according to claim 1,
The wide portion of the motor power supply brush includes an engagement portion that engages with the guide member, and when the motor power supply brush is engaged with the guide member, further movement toward the commutator side is restricted. .

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