JPH0428209Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Field of Industrial Application" The present invention relates to an improvement of a fork brush for a micromotor.

``Prior Art'' Conventionally, as shown in FIG. 8, a fork brush for a micromotor has a commutator contact portion 11 divided into fork shapes on the tip side of a brush body 10 made of a thin strip plate made of nickel silver or the like. However, a terminal plate 9 is welded orthogonally to the rear end of the brush body 10, and a vibration absorbing rubber 28 is glued to the back side of the commutator contact surface of the commutator contact portion 11. has been done.

``Problems to be Solved by the Invention'' However, in the conventional micromotor fork brush described above, the welding work of the brush body 10 and the terminal plate 29 and the work of attaching the vibration absorbing rubber 28 are very complicated, and the manufacturing process is difficult. Such fork brushes have the disadvantage that when a large number of fork brushes are collected, the fork-shaped portions of the commutator contact portions 11 become intertwined with each other, and it takes a great deal of effort to take them out one by one.

That is, the brush body 10 is required to have great elasticity and therefore needs to be formed thinly, whereas the terminal plate 29 also serves as a mounting piece, so it needs to be formed thickly to have a predetermined hardness. The main body 10 is made of an expensive alloy of precious metals such as nickel silver clad with silver palladium due to requirements such as elasticity, wear resistance, and electrical conductivity.
9 is made of an inexpensive metal such as copper, and only a predetermined conductivity needs to be ensured, so it is economical to manufacture both separately. However, not only are both of them small in shape, but the brush body 10 and the terminal plate 29 are first formed by press working, and then assembled and electrically welded.
Furthermore, since a process of different nature is required, such as gluing the vibration absorbing rubber 28, it is difficult to mechanize these manufacturing processes, and many parts are manufactured by hand.

The brush bodies 10 that have been formed during the manufacturing process may be arranged in an orderly manner, but if the brush bodies 10 that have been manufactured and separated one after another are dropped into one place, the fork-shaped parts will become entangled with each other and the brush bodies 10 will have to be taken out one by one. Therefore, great care must be taken to prevent the fork from bending, which extremely reduces work efficiency.

In addition, the forks of manufactured fork brushes also tend to get tangled, and if they are not separated into individual pieces with partitions, they will become tangled during storage or transportation to a motor assembly factory, etc. was.

The present invention was devised in view of the above-mentioned drawbacks, and it is an object of the present invention to provide a fork brush for a micromotor that prevents the fork portions from intertwining with each other during and after manufacture.

``Means for Solving the Problems'' In line with the above-mentioned purpose, the configuration of the present invention, which is summarized in the above-mentioned utility model registration claims, is to solve the above-mentioned problems. A commutator contact portion 11 divided into a fork shape is formed on the side, a caulking protrusion 12 is formed on the rear end side, and the front and back sides of the brush body 10 have a size that covers the entire surface of the brush body 10. A hole 21 into which the caulking projection 12 fits is formed on the rear end side, and a folding line 22a or notch line 22b made of a concave groove is arranged on the tip side of the hole 21, and further,
A conductive strip-shaped cover plate 20 with a window hole 23 for attaching the vibration-absorbing rubber 28 to the brush body 10 is placed on the tip side of the folding line 22a or the notch line 22b, and the cover plate 20 is placed in the hole 21 for the brush body. A technical measure is taken in which the caulking protrusions 12 of the main body 10 are fitted and caulked to overlap.

``Function'' Therefore, in the micromotor fork brush of the present invention, since the punching process of the brush body 10 and the cover plate 20 and the caulking process of both are press working, the brush body material is The brush body 10 is punched out, and the cover plate 20 is punched out from the cover plate material using a separate press unit.
The feed rate of both press units is adjusted to polymerize, and the process is completed by caulking using a separate press machine and then cut off in this state, so it can be easily mechanized.

Even if the semi-finished products manufactured in the above manner are cut off one by one, since the cover plate 20 is polymerized, the forks do not become entangled, and each piece can be easily taken out and glued to the vibration-absorbing rubber 28. You can move on to the process.

The fork brush for a micromotor completed by gluing the vibration absorbing rubber 28 is made by folding the cover plate 20 along the curve 22 when assembling the micromotor.
It can be used in the same manner as before by sequentially bending or cutting along the notch lines 22b and 22b.

``Example'' Next, an example of the present invention will be described below with reference to FIGS. 1 to 7.

In the figure, 10 is a brush body, and the tip side of this band-shaped brush body 10 is formed with a commutator contact portion 11 divided into fork shapes, which is the same as in the conventional case. A caulking projection 12 is formed on the rear end side of the brush body 10. The caulking projection 12 is formed by protruding a part of the brush body 10 to either the front or back side.

A hole 21 having a size that covers the entire surface of the brush body 10 and into which the caulking protrusion 12 fits on the rear end side is provided on both front and back sides of the brush body 10.
In addition to opening the hole 21, a folding line 22a or notch line 22b consisting of a concave groove is arranged on the tip side of the hole 21, and further, this folding line 22a or notch line 2
2b, a conductive strip-shaped cover plate 20 is provided with a window hole 23 for attaching the vibration-absorbing rubber 28 to the brush body 10, and a protrusion 12 for caulking the brush body 10 is inserted into the hole 21. are mated and caulked to form a polymer.

In the above and illustrated examples, the cover plate 20 is superimposed on the back side of the brush body 10, which is opposite to the commutator contact surface side, but it may be superposed on the commutator contact surface side (in other words, the front side). In this case, it goes without saying that the caulking projection 12 should protrude toward the surface of the brush body 10. Note that normally, the vibration-absorbing rubber 28 is attached to the front side of the brush body 10 as shown in the illustrated example, but even if this vibration-absorbing rubber 28 is attached to the back side of the brush body 10, its vibration absorption function will not be improved. It is known that there is no significant difference.

As shown in FIG. 3, the hole 21 has a small diameter on the insertion side of the caulking protrusion 12 and a gradually larger diameter on the other side, so that the head thereof protrudes from the cover plate 20 when caulked as shown in the same figure. It is desirable that the head not protrude, or even if the head protrudes as shown in the figure, it should be kept to a minimum extent.

Furthermore, the folding line 22a or the notch line 22
1 and 2, the folding line 22a is provided in the direction perpendicular to the longitudinal direction of the cover plate 20, and in this case, the cover plate 20 as shown in FIG.
is bent at a predetermined angle along the bending line 22a, and the rear ends of the brush body 10 and the cover plate 20 are fitted into the groove B1 arranged on the inner circumference of the bracket B as shown in FIG. The tip of 20 is used as a terminal plate.

In addition, in the example in FIG. 4, the folding line 22a is connected to the cover plate 20.
It is placed at a 45 degree angle to the cover plate 2.
0 along this folding line 22a, and the cover plate 20
The tip of the bracket B is taken out from a hole (not shown) provided in the bracket B and used as a terminal plate.

In addition, the example in FIG. 6 has a cutout line 22b instead of the folding line 22a, and in this case, the cover plate 2
The tip end side (left side in the same figure) of 0 is cut out along the notch line 22b and used. In the embodiment shown in FIG. 6, the cover plate 20 is largely protruded toward the rear end of the brush body 10, and this protruding portion is used as a terminal plate by extending it beyond the circumferential surface of the bracket B. .

Furthermore, in the example shown in FIG. 7, the folding line 22a is provided in the direct current direction of the cover plate 20 as in the example shown in FIG. It is used as a terminal board by protruding from the circumferential surface of B.

In the figure, reference numeral 28 indicates a vibration absorbing rubber, which is glued to a predetermined position of the brush body 10 through the window hole 23 while the cover plate 20 is in a superposed state.

``Effect of the invention'' The present invention is as described above, and since the fixing of the brush body 10 and cover plate 20 is changed to welding and caulked, it is possible to combine and fix the two using a press machine without using human hands. After the cover plate 20 is polymerized and caulked to the brush body 10, the two are always handled as one body, so the fork part of the brush body 10 is covered by the cover plate 20 and does not become entangled, and as a result, the vibration-absorbing rubber The gluing work of step 28 can be greatly reduced in labor compared to the conventional method, and furthermore, the fork parts will not get tangled even if they are simply placed in a storage container such as a bag during storage and transportation, making it easier to assemble the motor. It is possible to provide a fork brush for a micromotor that can save labor accordingly.

[Brief explanation of the drawing]

Fig. 1 is a front view showing one embodiment of the fork brush for micromotor of the present invention, Fig. 2 is a plan view in use, Fig. 3 is an enlarged sectional view of the caulking part,
FIG. 4 is a front view of another embodiment, FIG. 5 is a plan view of the embodiment shown in FIG. FIG. 8 is a perspective view of a conventional example. 10... Brush body, 11... Commutator contact part,
12...Protrusion for caulking, 20...Cover plate,
21... Hole, 22a... Folding line, 22b... Notch line.

Claims (1)

[Claims for Utility Model Registration] A commutator contact portion 11 divided into fork shapes is formed on the tip side of the brush body 10 in the form of a strip, and a protrusion 12 for caulking is formed on the rear end side. On both the front and back sides, a hole 21 is formed on the rear end side, into which the caulking projection 12 fits, and the hole 21 is large enough to cover the entire surface of the brush body 10, and a concave groove is formed on the tip side of the hole 21. A folding line 22a or a notch line 22b is arranged, and further,
A conductive strip-shaped cover plate 20 with a window hole 23 for attaching the vibration-absorbing rubber 28 to the brush body 10 is placed on the tip side of the folding line 22a or the notch line 22b, and the cover plate 20 is placed in the hole 21 for the brush body. A fork brush for a micromotor, which is formed by overlapping the caulking protrusions 12 of the main body 10 by fitting and caulking them together.