JPH0448131Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a brush holder device for a motor, which is constructed by providing a motor shaft with a commutator and a plate portion for detecting rotation.

[Problems to be solved by the prior art and the invention] In general, when this type of motor is used as a drive source for a so-called power window that automatically opens and closes the windows of a car, when the window is closed, it causes damage to the hands, neck, etc. When something gets caught, it is necessary to make an emergency stop of the motor drive to ensure safety. Therefore, a plate section for rotation detection is installed on the motor shaft in parallel with the commutator, and an abnormality in the motor drive is detected by the current value detected through the plate section as the motor shaft rotates. There is one that does this. By the way, in the case of a motor in which the motor shaft is provided with a commutator and a plate portion for detecting rotation, it is necessary to respectively assemble a brush for the commutator and a brush for the plate portion. However, in conventional brush holders, there are
It is formed by applying separately prepared holder members and fixing them together with appropriate means such as rivets. For this reason, the number of parts increases, and the work of assembling the brush holder becomes complicated and troublesome.In particular, on the plate side, as well as the brush on the commutator side, the pigtailed brush can be used as a coil bullet machine. Since the motor was biased and energized, it was necessary to remove the pigtail and slide the brush against the plate after the motor was assembled. It is extremely difficult to do so, and the workability is extremely poor, and problems have arisen in that people forget to remove the pigtail or that they do not remove it sufficiently, resulting in defective products.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was devised for the purpose of providing a brush holder device for a motor that can eliminate these drawbacks. In a motor in which a commutator and a plate part for rotation detection are arranged side by side, a commutator insertion chamber into which the commutator is inserted and a plate part insertion chamber into which the plate part is inserted are arranged on the front and back sides, and the commutator A brush holder in which a brush in sliding contact is attached to the plate portion and the plate portion is integrally molded, and the brush for the plate portion is fixed to the tip of an arm extending from the base end of the plate-shaped bullet. By engaging the part with the engaging part on the brush holder side, the brush for the plate part is elastically supported so that it faces toward the axis of the motor shaft from the opening provided in the plate part insertion chamber. This is a characteristic feature.

With this configuration, the present invention has a motor with a structure in which a commutator and a rotation detection plate are arranged side by side on the motor shaft, but the number of parts of the brush holder that holds these brushes can be greatly reduced. In addition, the assembly work can be significantly simplified, and the defective rate can be surely reduced.

[Example] Next, an example of the present invention will be described based on the drawings. In the drawings, 1 is a motor, which includes an armature 2, a motor case 4 provided with a permanent magnet 3, and a motor shaft 5 provided with the armature 2.
However, at one end of the motor shaft 5, along with a commutator 6, there is a guide surface 7a that is smaller in diameter than the commutator 6 and has a tapered tip. Rotation detecting plate portions 7 having rotation detection plates 7 formed thereon are arranged in parallel.

On the other hand, 8 is a brush holder, and the main body of the brush holder 8 is integrally molded from an insulating synthetic resin material, and necessary parts such as a brush are assembled to this as will be described later. It is constructed by attaching. That is, this brush holder 8 has a commutator 6 on one side with the plate-shaped core 8a as a reference.
A large diameter commutator insertion chamber 9 through which the plate portion 7 can be inserted, and a small diameter plate portion insertion chamber 12 through which the plate portion 7 can be inserted through the commutator insertion chamber 9 are arranged on the back side. The commutator insertion chamber 9 is juxtaposed with a housing chamber 11 in which the brush 10 with the pigtail 10a is housed so as to be freely retractable.
By operating the pigtail 10a,
As before, the locking of the brush 10 to the locking claw 11a is released, and the coil bomber 10b is placed inside the storage chamber 11.
It is adapted to come into sliding contact with the commutator 6 in a pressing manner under the urging force of the commutator 6.

On the other hand, the plate portion insertion chamber 12 is in communication with the commutator insertion chamber 9 with a stepped portion 9a on its inner peripheral surface, and the motor shaft 5 is connected to the commutator insertion chamber 9.
By inserting the plate part 7 from the side, the plate part 7 passes through the commutator insertion chamber 9 and into the plate part insertion chamber 12, but at this time, the step part 9a
By contacting the step 6a between the commutator 6 and the plate portion 7, further insertion of the motor shaft 5 is restricted and over-insertion is prevented. , and the plate portion 7 are inserted into the corresponding insertion chambers 9, 12, respectively.

Further, 13 is a brush for the plate portion 7, 14, 1
Bullets 5 are each made of a conductive plate made of a copper alloy (for example, phosphor bronze, etc.), and the base ends 14a, 15a of the bullets 14, 15 are provided with locking holes 14b. , 15b are formed respectively, and the base end portions 14a, 15a are slidably inserted into engagement grooves 16, 17 formed on the brush holder 8 side,
By locking the locking claws 16a, 17a on the brush holder 8 side in the locking holes 14b, 15b, the bullets 14, 15 can be locked integrally with the brush holder 8. Furthermore, the above-mentioned brush 13 is attached to the tip of the arm portions 14c, 15c which extend in a bent state from the base end portions 14a, 15a of the ammunition machines 14, 15.
are integrally fixed, but the arm portions 14c and 15c to which the brush 13 is fixed are displaced in the direction of insertion of the plate portion 7 into the insertion chamber 12, that is, toward the shaft end side of the motor shaft 5. The arm portion 14 is structured to extend in an inclined manner, and the base end portions 14a and 15a are engaged with the engagement grooves 16 and 17.
c and 15c are openings 1 through which the brush 13 is exposed.
2a, thereby preventing the brush 13 from being deflected more than necessary toward the axis from the opening 12a due to the biasing force of the bullets 14 and 15. And this ammunition 14, 15
Due to the biasing force, the brush 13 is elastically supported toward the axis so as to come into sliding contact with the plate 7b of the plate portion 7 inserted into the insertion chamber 12 in a pressing manner, as will be described later. Further, the brush holder 8 is provided with a receiver 21 for receiving the bullets 14 and 15 on the back side of the brush 13 to prevent the bullets 14 and 15 from becoming loose.

Furthermore, the brush holder 8 is formed with an assembly part 18a to which the circuit breaker 18 is assembled, and the bottom plate of the assembly part 18a is thin, so that the terminal connection of the circuit breaker 18 is not possible. It is set to be good. Also, 19
is a lead stay that is attached to the brush holder 8 by caulking the legs 19a, and a terminal 20 connected to the pigtail 10 of the commutator brush 10 is tightly fitted into the lead stay 19. A fitting piece 19b that is integrally connected and an engaging piece 19c to which a lead wire (not shown) is engaged and welded are planted. Furthermore, necessary members such as a capacitor unit 20 are attached to the brush holder 8.

In the embodiment of the present invention constructed as described above, when assembling the motor 1, it is necessary to assemble the brush holder 8. Since the brush holder is integrally molded with a structure in which the insertion chambers 12 for brush holders are placed on the front and back sides, there is no need to separately fix each insertion chamber to a substrate such as Bakelite as in the conventional case. The number of parts (8) can be significantly reduced, and the assembly process can be significantly simplified. Furthermore, it is necessary to attach members such as the brushes 10 and 13 to this main body, but first, as for the commutator brush 10, push the brush 10 into the storage chamber 11 with the coil bomber 10b inside and engage it. Brush 1 on retaining claw 11a
0 is locked and held in the immersed state,
After assembling the commutator 6, attach the pigtail 1 at an appropriate time.
The brush 10 can be assembled by operating the lever 0a and removing the brush 10 from the locking pawl 11a. Moreover, regarding the brush 13 for the brush holder 8, the bullets 14, 1
5 only needs to be engaged with the brush holder 8. That is,
The bullets 14 and 15 have base end portions 14a and 15a provided in the brush holder 8, respectively, with corresponding engagement grooves 16,
17, the locking holes 14b and 15b are connected to the locking claws 16a,
The end of the arms 14c, 15c of the ammunition 14, 15 secured in this way is securely secured by an extremely simple one-touch operation of sliding it in until it engages with the bullet 17a. A brush 13 is integrally provided in a state where it is elastically supported so as to face the opening 12a of the plate portion insertion chamber 12. Therefore, the brush 13 for the plate portion 7 is biased by a conventional coil elastic machine. The complicated and troublesome work of installing the brush, which is the case with brushes with pigtails, is completely unnecessary.

As described above, in the present invention, although the motor is provided with the brush 10 for the commutator 6 and the brush 13 for the plate portion 7, the brush holder 8 has both insertion chambers 9 and 12 arranged on the front and back sides. Supplied as an integral molded product,
And the brush 13 for the plate part 7 is simply the bullet 1.
4 and 15 can be assembled extremely easily by simply attaching them to the brush holder 8.
Therefore, not only can the number of parts of the brush holder 8 be significantly reduced, but also the work of assembling the brush 13 for the plate portion 7 is extremely simplified, and the work of removing the pigtail can be completely eliminated. In addition to significantly improving the workability of the assembling work, there are no mistakes such as forgetting to remove the pigtail, and
Extremely reliable, defect-free, high-quality motors can be provided in large quantities and at low cost.

Moreover, the arm portions 14c and 15c to which the brush 13 is fixed are received and abutted on the edge of the opening 12a, and are prevented from being deviated toward the axis more than necessary. When inserting the plate part 7 into the insertion chamber 12, the brush 13 is caught on the end of the plate part 7, preventing the plate part 7 from being inserted. It will be expanded. Furthermore, since the brush 13 is provided on arm portions 14c and 15c that extend from the base end in an inclined manner along the direction of insertion of the motor shaft 5 into the brush holder 8, it is essentially a spring-loaded portion. Arm part 1 that acts as
The lengths (spans) of 4c and 15c can be set longer, and therefore the spring characteristics of the bombs 14 and 15 can be improved. The force in the direction in which the plate portion 7 contacts and pushes the brush 13 toward the rear is
Even if the projectile forces were to work hard, the projectiles 14 and 15 would be smoothly pushed apart without any deformation.
This, together with the action of regulating the deflection of the brush 13 toward the axis, causes the bullet 14, 15, the plate part 7 can be easily, quickly and reliably inserted into the insertion chamber 12. If the plate part 7 is inserted in this way, The brush 13 comes into sliding contact with the plate surface 7b of the plate portion 7 in a pressing manner.

In addition, as in this embodiment, the base end portions 1 of the bullets 14 and 15
By machining bead portions 14d and 15d on the proximal ends 14a and 15a, the strength of the ammunition 14 and 15 can be increased.
17, bead portion 1
4d and 15d, which is advantageous because it is possible to achieve a close fitting effect, and the ammunition 14 and 15 can be engaged without play.

[Operation and Effect] In summary, the present invention is constructed as described above, and the brush holder to which the brushes for the commutator and plate portion are assembled has a commutator insertion chamber and a plate portion insertion chamber on the front and back sides. Therefore, the number of parts can be significantly reduced compared to the conventional case where each insertion chamber must be fixed to the board separately. , a significant simplification of the brush holder assembly process can be achieved. Moreover, the brush for the plate part can be assembled by an extremely simple work process of just engaging the base end of the plate bullet to the brush holder side, and the brush can be assembled in this way. Since the brush is elastically brought into contact with the opening of the plate insertion chamber under the biasing force of the bullet, it can slide into pressing contact with the plate while the bullet remains attached. Therefore, the structure does not become complicated as in the conventional brush with a pigtail that is energized by a coil bomb, and the removal work of the pigtail is completely unnecessary. This eliminates the possibility of malfunctions caused by forgetting to do so, and it is possible to provide highly reliable, high-quality motors in large quantities at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of a brush holder device for a motor according to the present invention, in which FIG. 1 is an overall cross-sectional view of the motor, and FIGS. 2A, B, C, D, and E each show a brush holder device. The front view, left and right side views, perspective view from the back, perspective view from the front, Figures 3A, B, and C, and Figures 4A, B, and C are the front view and plan view of the bomber, respectively. FIG. 5 is a perspective view of the reed stay, FIG. 6 is a cross-sectional view of the main part showing a state in which the ammunition is engaged, and FIG. 7 is a rear view of the main part of the same. In the figure, 1 is a motor, 5 is a motor shaft, 6 is a commutator, 7 is a plate part, 8 is a brush holder, 9 is a commutator insertion chamber, 10 is a commutator brush, 12 is a plate part insertion chamber, and 12a is a 13 is a brush for the plate portion; 14 and 15 are bullets; 14a and 15a are base ends of the bullets; and 14c and 15c are arms.

Claims (1)

[Claims for Utility Model Registration] 1. A motor in which a commutator and a plate portion for rotation detection are arranged side by side on a motor shaft, a commutator insertion chamber through which the commutator is inserted, and a plate portion through which the plate portion is inserted. It has a structure in which the insertion chambers are arranged on the front and back sides, and a brush holder is integrally molded in which the brushes in sliding contact are attached to the commutator and the plate part, respectively, and the brush for the plate part is inserted from the base end of the plate-shaped bullet machine. By fixing it to the tip of the extending arm and engaging the base end of the bullet to the engagement part on the brush holder side,
A brush holder device for a motor, characterized in that a brush for a plate part is elastically supported so as to face toward the axis of a motor shaft from an opening provided in a plate part insertion chamber. 2. The motor brush according to claim 1, wherein the arm portion of the plate-shaped bullet machine extends in an inclined manner from the base end along the insertion direction of the plate portion. holder device. 3. A utility model characterized in that the brush for the plate portion is elastically supported in such a manner that deviation in the axial direction of the motor shaft is restricted by the arm portion coming into contact with the opening edge portion. A brush holder device for a motor according to claim 1. 4. The motor according to claim 1, wherein the plate-shaped bullet is configured to be engaged with an engaging portion on the brush holder side by pushing and inserting the base end thereof. brush holder device.