JP2584189Y2 - Assembling structure of brush in motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for assembling a brush in a motor used for electric components of a vehicle.

[0002]

2. Description of the Related Art
The brush of this type of motor is attached to a commutator formed on the armature shaft so as to be in sliding contact with the commutator. As a result, the brush protrudes toward the shaft center beyond the commutator sliding surface in a state where the commutator does not exist.
For this reason, when assembling the motor, if the armature is to be assembled while the brush is in this protruding state, the brush is in the way and the armature can not be incorporated. Therefore, conventionally, there is a type in which the brush is temporarily held at a position away from the commutator in opposition to the ammunition, and after the armature is assembled in this state, the brush is temporarily held and released. In this case, the work of temporarily holding each brush and the work of releasing the brush are required, which is troublesome and complicated, and there is a fear that the work of releasing may be forgotten. For this reason, Japanese Utility Model Application Laid-Open No. 58-115862 and
As shown in JP-A-166262, while a brush unit is prepared in advance, a brush unit is set in a brush holder, an opening is formed in a holder stay portion to which the brush holder is attached, and after the armature is assembled in advance, the opening is formed. It has been proposed that a brush unit be incorporated from the department. However, in the former, a brush unit is formed for each brush, and these are separately fitted and assembled.Therefore, the brush unit requires only the number of brushes, and the number of parts is large, and workability is poor. Because the brush is urged to protrude greatly from the brush unit by the ammunition incorporated in the brush unit, the brush abuts against other members and breaks before the brush unit is assembled into the holder stay. There is a problem that it is easy to do. In contrast, the latter has a pair of brushes incorporated into one brush unit,
Although there is an advantage that the number of brush units can be halved compared to the former, there is no brush housing,
The brush is biased and supported in a state where it is exposed via a leaf spring fixed to the brush holder, and cannot be stably held by the brush receiving portion of the brush. A guide receiving portion that guides the brush so as to slide on the commutator is formed by contacting the peripheral surface to expand the space between the facing brushes. In this case, the surface of the commutator is contacted by the guide receiving portion. There is a problem that there is a risk of damage.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made with the object of providing an assembly structure of a brush in a motor which can eliminate these disadvantages. In a motor in which a pair of brushes slidably contacting radially opposite sides of a commutator are respectively housed in brush housing portions formed in a brush holder, the brush holder is provided with a pair of end portions of the commutator. The brush holders are formed integrally with each other in a substantially U-shape so as to oppose the radially opposite side portions, and the brush accommodating portions are respectively formed at the tip portions of the two leg portions. A support portion and a through hole for penetrating both legs from outside so that the brush accommodating portion faces radially opposite sides of the commutator are formed. There is characterized in that are arranged in a position that the repression of the brush accommodated in the brush accommodating portion in accordance with the reaching the commutator corresponding site.

According to the present invention, with this configuration, a pair of brushes are housed in a brush housing portion formed in a brush holder without being biased by an elastic machine to form a unit, and a holder stay portion is provided. In this way, the brush can be protected and the assembly can be simplified.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 denotes a motor with a speed reduction mechanism serving as a power source of electric components for a vehicle, and a casing 2 of the motor 1 is attached to a bottomed cylindrical yoke 3 and an open end of the yoke 3. The yoke 3 incorporates various members such as a permanent magnet 5, an armature shaft 6, and an armature core 7, and the end case 4 has a tip of the armature shaft 6. Worm gear 6a formed in the portion, the worm gear 6a
A speed reduction mechanism such as a worm wheel (not shown) that meshes with the motor is incorporated, and all of these basic configurations are the same as those of the related art.

The casing 2 has a yoke-side end of the end case 4 formed as a holder stay 9 into which a brush unit described later is incorporated. That is, the holder stay 9 has a cylindrical shape with a bottom, and a commutator 10 formed integrally with the armature shaft 6 in the cylindrical portion 9a.
In this holder stay portion 9, the width B in the horizontal line H direction is longer than the width A in the vertical line V direction perpendicular to the axis of the armature shaft 6 (A <B). It has a shape. An insertion hole 9c through which the worm gear 6a is inserted is formed at a center portion of the cylindrical bottom portion 9b of the holder stay portion 9, and an armature shaft 6 is rotatably supported on a peripheral portion of the insertion hole 9c. 9d for the bearing 12 is formed.

Further, on the inner cylinder side surface of the cylinder bottom portion 9b, the coil portions 13 of a pair of left and right torsion coil type brush ammunition 13, 14 are provided.
c and 14c, respectively, and the left and right armature support portions 15 and 16 through which the brush arms 13 and 14 are inserted.
The left and right locking portions 17, 18 for locking the respective portions 4a are projected, and in this embodiment, as shown in FIG.
These are all above the horizontal line H, and the bullet support portions 15, 16 and the locking portions 17, 18 are connected to the vertical line V.
, Respectively, and the locking portions 17 and 18 are provided so as to be positioned lower than the armature support portions 15 and 16. The brush ammunition 13, 1
The four end portions 13a, 13b, 14a, and 14b are each linearly extended, and the extended ends are formed in an expanded shape. In addition, the brush ammunition 13, 14 is inserted into and supported by the ammunition support portions 15, 16, and the one end 13
a and 14a are clamped between the engaging portions 17 and 18 and the inner peripheral surface of the cylindrical portion 9a to be locked.
Nos. 3 and 14 are set such that the other end portions 13b and 14b of the bullets project inward in the right and left directions in a natural state, respectively, and face the fitting paths of the brush holder legs 23b and 23c described later. By the way, the heights C and D of the mounting positions of the brush ammunition 13 and 14 of the left and right armature support portions 15 and 16 are the same as those of the brush ammunition 1.
3 and 14 are different by an amount substantially equivalent to the length L (D ≒ C +
L). For this reason, if the ammunition units 13 and 14 having the same twisting direction are attached to the ammunition support units 15 and 16 so that the left and right directions are opposite to each other, the other end units 13b and 14b
Are projected at substantially the same height, so that consideration can be given to using the brush brushes 13 and 14 which are common to the left and right.

The cylindrical portion 9a of the holder stay 9 is
A concave portion 19 is formed on the outer peripheral surface on the upper side with respect to the horizontal line H, and through holes 20 and 21 are formed in both left and right portions of the concave portion 19, into which brush holder legs 23b and 23c to be described later are fitted from the outside. However, these through holes 20,
21 is the left and right inward than the bullet support parts 15 and 16,
It is provided so as to be located left and right outside the commutator 10 and to be symmetrical with respect to the vertical line V. Further, the through holes 20 and 21 have a substantially square shape, and the peripheral edge portions are formed in tapered shapes 20a and 21a such that the outer side is wider and the inner side is narrower. A guide body 22 protruding toward the commutator 10 is integrally formed on the inner peripheral surface of the recess 19 between the through holes 20, 21. Are formed with guide surfaces 22a, 22b extending from the through-hole tapered portions 20a, 21a to portions near both sides in the radial direction of the commutator 10.

On the other hand, reference numeral 23 denotes a brush holder, which comprises a mounting plate portion 23a and both leg portions 23b, 23b.
c and are integrally formed in a substantially U-shape by
At the tips of the legs 23b, 23c, brush housings 24, 25 are formed, each having a rectangular tube shape with both bottoms opened, and the brushes 26, 27 are housed therein so as to be freely retractable. The unitary brush holder 23 in which the brushes 26 and 27 are accommodated is mounted on the holder stay 9 in which the armature shaft including the armature shaft 6, the armature core 7, the commutator and the like is pre-installed. However, this mounting structure is as follows. That is, when attaching the brush holder 23, the brush ammunition 13, 14 is previously attached to the
In this state, both ends 23a and 23b of the brush holder are fitted into the through holes 20 and 21, respectively. At this time, as described above,
b, 14b face this insertion path and
As shown in the figure, when the legs 23b and 23c are fitted,
Protrusions 24a, 25a formed at the left and right outer corners on the distal end side of the brush brush accommodating portions 24, 25 are provided with the other end portion 13b of the machine.
14b and the lower side, that is, the brush ammunition 13, 1
4 is pressed in the direction in which it is urged.

On the other hand, the brushes 26 and 27 accommodated in the brush accommodating portions 24 and 25 have their fitting tips at the commutator 10.
The guide surface 22a of the guide body 22
The brushes 26 and 27 are guided by the commutator 10 and then fitted by the commutator 10.
At the right and left sides of the commutator 10 in the radial direction.
b is disengaged from the brush housing projections 24a, 25a.
The brushes 26 and 27 are set so as to abut against the radially outer surfaces of the brushes 6 and 27 and press the brushes 26 and 27 toward the commutator 10. Further, when the brushes 26 and 27 reach both left and right positions in the radial direction of the commutator 10, the mounting plate portion 23a
Is in contact with the outer peripheral surface of the concave portion 19 so that further fitting of the two leg portions 23b and 23c is restricted. In this state, the mounting plate portion 23a is screwed 28 into the concave portion 19 by screwing. The brush holder 23 is configured to be integrally attached to the holder stay 9. In the figure, 2
3d, 23e, 24b, 25b are both legs 23a, 23b
In addition, routing grooves for the pigtails 30 formed in the brush accommodating portions 24 and 25, respectively, 24c and 25c are fitting grooves of the other end portions 13b and 14b of the machine, and 31 is a tip of the extended pigtail 30. External connection terminal to be connected.

In the embodiment of the present invention constructed as described above, when the brushes 26 and 27 are assembled into the motor 1, as described above, the brush ammunition is mounted on the cylinder bottom 9b of the holder stay 9 formed in the casing 2 in advance. 13 and 14 are assembled, and an armature assembly is assembled in the holder stay 9. In this state, the two legs 2 of the brush holder 23 in which the brushes 26 and 27 are previously assembled and unitized are formed.
3b and 23c are fitted and assembled into the through holes 20 and 21 of the holder stay portion 9. In this case, the brush unit is composed of a pair of brush housing portions 2 formed on the brush holder 23.
Since the brushes 26 and 27 are formed by incorporating the brushes 26 and 27 into the brush housings 4 and 25, respectively,
In addition to ensuring stable holding by the brushes 4 and 25, it is not necessary to form a brush unit for each brush, so that the number of parts cannot be reduced and the number of assembly work steps is reduced.

Furthermore, in this case, the brush ammunition 1
The brush holders 3 and 14 are not built in the brush holder 23 but are built in the holder stay portion 9.
3 is inserted into the holder stay portion 9, and the brushes 26, 27 are resiliently pressed at the timing when the brushes 26, 27 substantially reach the radially opposite sides of the commutator 10, and as a result, the brushes When the brush unit is assembled into the holder stay portion, such as when the machine is assembled into the brush holder, the brush does not protrude greatly from the brush unit, and the brushes 26 and 27 abut against other members. Is avoided, the brush 26,
There is no need to temporarily hold 27 in brush holder 23. Further, in assembling the brush unit to the holder stay 9, the brushes 26, 27 are first guided by the tapered portions 20 a, 21 a of the through holes 20, 21 and fitted into the through holes 20, 21. The guide member 22 is moved to a position where its fitting tip comes into contact with the commutator 10.
Are guided by the guide surfaces 22a and 22b, and thereafter reach the radially opposite side portions of the commutator while being guided by the commutator 10, so that the brushes 26, 2
7 can be easily guided to an appropriate position. In addition, when the brush unit is assembled, only the brushes 26 and 27 actually come into contact with the commutator 10, and the guide receiving portion formed at the tip end of the leaf spring does not slidably contact the commutator unlike the conventional one. As a result, there is no fear that the commutator surface is damaged by the guide receiving portion. In addition, since the brush ammunition 13 and 14 are of the torsion coil type in the embodiment, the vibration accompanying the rotation of the commutator is transmitted through the brush to vibrate the leaf spring, as in the case of using a leaf spring as the brush ammunition. As a result, it is possible to avoid such a problem that noise is generated. Further, since the brush unit is assembled from the outer peripheral surface on the upper side of the holder stay cylindrical portion 9a, as in the embodiment, in the case of incorporating a speed reduction mechanism such as a worm wheel from the upper side of the end case 4, Since the brush unit and the reduction mechanism can be assembled from the same direction, when the motor 1 is assembled on an automated line, it can greatly contribute to simplification of the line.

[0013]

[Effects] In summary, the present invention is constructed as described above. Therefore, when assembling the brush to the motor, the two legs of the brush holder into which the brush is incorporated and made into a unit are previously armatured. In this case, the brush unit is fitted into the holder stay portion into which the sea is incorporated from the through hole, and in this case, the brush unit is formed by incorporating the brushes into a pair of brush accommodating portions formed in the brush holder. In addition to ensuring the stable holding of the brushes by the brush receiving section, a pair of brushes can be incorporated into one brush unit, eliminating the need to form a brush unit for each brush and reducing the number of parts. However, the number of assembly work steps is also reduced. Furthermore, in this device, the repelling machine for repressing the brush is incorporated in the holder stay portion, and furthermore, based on the fitting of the brush holder into the holder stay portion, the brush substantially reaches both sides in the radial direction of the commutator. At the same time, the brush will be repressed, and as a result, when the brush unit is installed in the holder stay portion, as in the case where the machine is previously installed in the brush holder,
The brush does not protrude greatly from the brush unit, so that the brush is prevented from abutting against other members, so that the brush is temporarily held so as not to protrude significantly from the brush unit. There is no need at all. In addition, when the brush unit is assembled, only the brush contacts the commutator, and the guide receiving portion formed at the tip end of the leaf spring does not slide on the commutator unlike the conventional brush unit. The possibility that the surface of the commutator is damaged by the guide receiving portion can be reliably avoided.

[Brief description of the drawings]

FIG. 1 is a plan view of a motor.

FIG. 2 is a plan view of a holder stay portion.

FIG. 3 is a horizontal sectional view of the same.

FIG. 4 is a longitudinal sectional view of the same.

FIG. 5 is a side view of the same.

FIG. 6 is a perspective view of a brush holder.

FIG. 7 is an explanatory view showing how a brush unit is attached to a holder stay.

[Explanation of symbols]

 9 Holder Stay 10 Commutator 13 Brush Ammunition 14 Brush Ammunition 15 Ammunition Support 16 Ammunition Support 20 Through Hole 21 Through Hole 23 Brush Holder 23b Leg 23c Leg 24 Brush Storage 25 Brush Storage 26 Brush 27 Brush

Claims (1)

(57) [Scope of request for utility model registration] 1. A motor in which a pair of brushes slidingly contacting radially opposite sides of a commutator are respectively accommodated in a brush accommodating portion formed in the brush holder so as to be able to protrude and retract. Assume that the tips are integrally formed in a substantially U-shape so as to oppose the radially opposite sides of the commutator, and that the brush receiving portions are formed at the tips of the two legs, respectively.A brush stay is provided on a holder stay portion to which the brush holder is attached. The supporting portion of the repelling machine and the penetrating hole for penetrating both legs from outside so that the brush accommodating portion opposes both sides in the radial direction of the commutator are formed. A brush assembling structure in a motor, wherein the brush is mounted at a position where the brush accommodated in the brush accommodating portion is repressed in accordance with reaching the part.