JPH0130864Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a motor brush holder base fixing device for fixing a brush holder base to a bearing bracket of a motor case.

[Prior Art] Conventionally, when fixing a brush holder base to a bearing bracket of a motor case, it has been common to use screws, rivets, or the like.

However, this method has the disadvantage that the number of parts increases, the fixing work is troublesome, and the number of man-hours increases.

Furthermore, as a device for solving the above-mentioned drawbacks, the devices shown in FIGS. 1 to 3 are conventionally known.

In FIGS. 1 to 3, reference numeral 1 denotes a brush holder base, and the base 1 fixes a brush holder 3 holding a brush 2. As shown in FIG.

On one surface of the brush holder base 1, a plurality of elastic locking pieces, that is, a pair of locking pieces 4, 4 facing each other and a pair of locking pieces 5, 5 facing each other are planted, respectively. It has been set up.

The pair of locking pieces 4, 4 are integrally formed with hook-shaped engaging claws 4a, 4a that extend downwardly and inwardly from their respective tips.

Further, the base portions of the pair of locking pieces 5, 5 are integrated, but the tip sides are divided by a groove 5a, and the respective ends of the pair of locking pieces 5, 5 are separated from each other from the outside. A hook-shaped engagement claw 5 extending downward
b, 5b are integrally formed.

6 is a motor case, and 7 is a bearing bracket integrated with the motor case 6. A bearing 8 is press-fitted into the bearing bracket 7.

Through holes 7a, 7a are provided in the bearing bracket 7 at positions corresponding to the pair of locking pieces 4, 4, respectively.
are bored therein, and the pair of locking pieces 5,
One through hole 7b is bored at a position corresponding to 5.

The inner diameter of each of the through holes 7a is smaller than the maximum outer diameter of the tip of each hook-shaped engaging claw 4a, and the inner diameter of the through hole 7b is smaller than the maximum outer diameter of the tip of each of the hook-shaped engaging claws 4a. The diameter is smaller than the maximum pitch between the tips of the tips 5b and 5b.

The pair of locking pieces 4, 4 are connected to the through holes 7a, 4, respectively.
7a, and the pair of locking pieces 5,
5 facing the through hole 7b and pushing the brush holder base 1 to the left in FIG. , 4 are inserted into the through holes 7a, 7a, respectively, and the pair of locking pieces 5, 5 are inserted into the through hole 7b. Boss portion 1a of brush holder base 1
is in contact with the end surface of the bearing 8, each engaging pawl 4a
At the same time, the tips of the engaging claws 5b come out of the through holes 7b.
Therefore, the elastic deformation of each of the engagement claws 4a and each of the engagement claws 5b is released, and the respective tip ends engage with one side 7c of the bearing bracket 7, and the brush holder base 1 is brought into contact with the bearing bracket 7. Fixed.

Therefore, the number of parts is reduced compared to a method of fixing using screws, rivets, etc., and the fixing work is facilitated, reducing the number of assembly steps.

[Problems to be solved by the invention] However, in this device, each engaging claw 4a and each engaging claw 5b are easily deformed upward in FIGS. 2 and 3 due to vibration, impact, etc., causing play. There were times when I did.

Also, when installing the brush holder base 1,
In order to make the tip of each engaging pawl 4a and the tip of each engaging pawl 5b come out of the through holes 7a, 7a and the through hole 7b, respectively, at the position where the boss portion 1a is in contact with the end surface of the bearing 8, Sufficient dimensional accuracy is required for each related component, making it expensive.

Here, a wave washer 9 may be interposed between the bearing 8 and the boss portion 1a to absorb the play and the dimensional error, respectively, but in that case, there is a problem that the number of parts increases.

[Purpose of the invention] The present invention was devised in view of the above-mentioned conventional problems. When fixing the brush holder base to the bearing bracket, the fixing work can be easily performed, the parts can be fixed securely, and the parts can be fixed easily. To provide a motor brush holder base fixing device that does not increase the number of points.

[Means for Solving the Problems] The structure of the motor brush holder base fixing device according to the present invention is such that a plurality of elastic locking pieces 14 are implanted in the brush holder base 11, and the plurality of locking pieces 14 are integrally formed with engaging claws 15, and the bearing bracket 1 of the motor case 16 is
Through-holes 19 are formed at positions corresponding to the respective engaging claws 15 in 7, and the engaging claws 15 are respectively engaged with the respective through-holes 19 to connect the brush holder base 11 to the bearing bracket 17. In the brush holder base fixing device of the motor fixed to
The plurality of locking pieces 14 are provided as a pair of locking pieces 14, 14 facing each other, and each of the locking claws 15 extends from the tip of each pair of locking pieces 14, 14. They are formed so as to protrude outward from each other, and the through holes 19 are formed in each of the engaging claws 15.
sloped surfaces 15 for backlash compensation that engage with the outer peripheral edges of the
It is characterized by the formation of b.

[Function] According to the configuration of the present invention described above, when the brush holder base 11 is fixed to the bearing bracket 17 of the motor case 16, when each engagement claw 15 comes into contact with each through hole 19, each elastic Insertion of each of the engaging claws 15 is permitted by elastic deformation of the pair of locking pieces 14, 14, and at this time, the sloped surface 15b for backlash compensation formed on each of the engaging claws 15 engages each pair of locking pieces. Piece 1
They are firmly engaged with the outer periphery of each through hole 19 by the bending reaction forces 4 and 14, respectively.

Therefore, even if the outer peripheral edge of each through hole 19 or the slope surface 15b for backlash compensation is slightly worn due to vibration, impact, etc., each slope surface 15b is is always strongly engaged with the outer peripheral edge of each through hole 19.

[Example] The present invention will be described below based on an example shown in FIGS. 4 to 9.

FIG. 4 is a partially sectional side view showing an embodiment of the motor brush holder base fixing device according to the present invention, and FIG. 5 is an enlarged sectional view taken along the line - in FIG.
Fig. 6 is an enlarged view taken from the direction of arrow A in Fig. 4, Fig. 7 is a partial sectional view taken along the - line in Fig.
The figure is a view taken from the direction of arrow B in FIG. 7, and FIG. 9 is a sectional view taken along the line -- in FIG.

In FIGS. 4 to 9, reference numeral 11 denotes a brush holder base, and the base 11 fixes a brush holder 13 holding a brush 12. As shown in FIG.

On one side of the brush holder base 11,
A plurality of elastic locking pieces, i.e., one facing each other
In this embodiment, two pairs of locking pieces 14, 14 are integrally installed with a gap between them.

Each of the pair of locking pieces 14, 14 is integrally provided with engaging pawls 15, 15 each having a triangular cross-section and protruding outward from each other. The upper sloped surfaces of each pair of engagement claws 15, 15 in FIG. 15a, 15a, and the lower sloped surfaces become sloped surfaces 15b, 15b for backlash compensation, which engage with the outer peripheral edge of each through hole 19, respectively.

16 is a motor case, and 17 is a bearing bracket integrated with the motor case 16. A bearing 21 for supporting an armature shaft (not shown) is press-fitted into the cylindrical portion 18 of the bearing bracket 17.

Through holes 19 are formed in the bearing bracket 17 at positions corresponding to each pair of locking pieces 14, 14, respectively. Here, the inner diameter of each of the through holes 19 is smaller than the maximum pitch between the engaging claws 15, 15 formed at the tips of the pair of locking pieces 14, 14, respectively. Further, as shown in FIG. 6, the bearing bracket 17 is formed with a recess 20 in which the brush holder base 11 is disposed.
A plurality of projections 11a integrally formed on the outer periphery of the brush holder base 11 at intervals are fitted into the inner wall 20a of the recess 20.

In addition, from each locking piece 14 to the brush holder base 1
The hole 22 penetrated through the brush holder 13
This is for passing a lead wire (not shown) connected to the.

In the above configuration, the brush holder base 11
To fix the brush holder base 11 to the bearing bracket 17, the relative position of the brush holder base 11 with respect to the bearing bracket 17 is determined by first fitting the plurality of protrusions 11a formed on the base 11 into the inner wall 20a of the recess 20 of the bearing bracket 17. By pushing the brush holder base 11 in the direction of arrow A in FIG.

Here, since each pair of locking pieces 14, 14 has elasticity, each pair of locking pieces 14, 14 is elastically deformed and bent inward. Therefore, insertion of each pair of engaging claws 15, 15 is allowed, and the fourth
As shown in the figure, each pair of locking pieces 14, 14, ie,
Each pair of engaging claws 15, 15 is inserted into each through hole 1 until the upper surface 11b of the brush holder base 11 comes into contact with the end surface 18a of the cylindrical portion 18 of the bearing bracket 17.
9 respectively. At that time, each engagement claw 15
The sloped surface 15b for backlash compensation formed in the hole 1 is opened by the reaction force of the deflection of each pair of locking pieces 14, 14.
The brush holder base 11 is firmly engaged with the outer peripheral edge of the brush holder 9 and is fixed to the bearing bracket 17.

Therefore, even if the outer periphery of each through hole 19 or each backlash compensation slope surface 15b is slightly worn due to vibration, impact, etc., the bending reaction force of each pair of locking pieces 14, 14 will cause each slope surface to 15b is always strongly engaged with the outer periphery of each through hole 19, and there is no play between the brush holder base 11 and the bearing bracket 17.
The base 11 can be securely fixed to the bearing bracket 17.

Further, the cylindrical portion 18 of the bearing bracket 17 and a pair of locking pieces 1 each having an engaging pawl 15 formed at the tip thereof
Even if there is some error in the height dimension of each of the engagement claws 15, this dimensional error can be absorbed by the play compensation slope surface 15b formed on each engaging claw 15. It becomes unnecessary and cheap.

[Other Embodiments] FIG. 10 is a sectional view similar to FIG. 9 showing another embodiment of the locking piece, in which the brush holder base 11
The bases of each pair of locking pieces 14, 14 integrally implanted in the
Each engaging claw 15, 1 formed at the tip of 4, 14, respectively.
5 are connected, and has the same function as each pair of locking pieces 14, 14 shown in FIG. In addition, 23,2
3 is a hole through which a lead wire (not shown) connected to the brush holder 13 is passed.

[Effects of the invention] As explained above, according to the motor brush holder base fixing device according to the present invention, each pair of locking pieces implanted in the brush holder base can be moved outward from each other from the tips of each pair of locking pieces. The protruding engaging claws are provided with sloped surfaces for play compensation that engage with the outer peripheries of through holes formed at positions corresponding to the respective engaging claws in the bearing bracket of the motor case. When fixing the brush holder base to the bearing bracket, the number of parts does not increase, the fixing work can be easily performed, and play between the brush holder base and the bearing bracket does not occur due to vibration or impact. The base can be reliably fixed to the bearing bracket without having to do so.

In addition, the dimensional errors of related parts can be absorbed by the sloped surface for backlash compensation.
Strict dimensional accuracy is unnecessary and the cost becomes low.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing a conventional example of a motor brush holder base fixing device, and Fig. 2 is a side view showing a conventional example of a motor brush holder base fixing device.
Figure 3 is an enlarged sectional view taken along the - line in Figure 1.
4 is a partially sectional side view showing an embodiment of the motor brush holder base fixing device according to the present invention; FIG. 5 is an enlarged sectional view taken along the - line in FIG. 4; FIG. 4 is an enlarged view taken from the direction of arrow A in FIG. 4, FIG. 7 is a partial sectional view taken along the line - in FIG. FIG. 7 is a cross-sectional view taken along the - line, and FIG. 10 is a cross-sectional view similar to FIG. 9 showing another embodiment of the locking piece. DESCRIPTION OF SYMBOLS 11... Brush holder base, 14... Locking piece, 15... Engaging claw, 15b... Inclined surface for backlash compensation, 16... Motor case, 17... Bearing bracket, 19... Through hole.

Claims (1)

[Claims for Utility Model Registration] A plurality of elastic locking pieces 14 are implanted in the brush holder base 11, and an engaging pawl 15 is integrally attached to each of the plurality of locking pieces 14.
At the same time, through holes 1 are formed in the bearing bracket 17 of the motor case 16 at positions corresponding to the respective engaging claws 15.
In the brush holder base fixing device for a motor, the brush holder base 11 is fixed to the bearing bracket 17 by respectively engaging the engaging claws 15 with the through holes 19, A plurality of locking pieces 14 are provided as pairs of locking pieces 14, 14 facing each other, and each of the engaging claws 15 is connected to each pair of locking pieces 1.
4 and 14 so as to protrude outward from each other, and each engaging claw 15 is formed with a play compensation slope surface 15b that engages with the outer peripheral edge of each through hole 19, respectively. A motor brush holder base fixing device characterized by: