JPH021032Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a brush power supply device, and more specifically, to a terminal plate, a pigtail, and a mounting bracket in a brush power supply device for supplying power to rotating equipment via a brush. Regarding the structure of the insulation part and the fixing of the terminal board.

[Prior art]

Conventional power supply devices for electromagnetic clutches are shown in FIGS. 1-4. 1 to 4, reference numeral 1 is a brush holder made of an insulator, and 2 and 7 are springs that are held in the brush holder 1, one end of which is connected to the brush holder 1, and the other end of which is connected to the brush described later. are in contact with each other. Reference numerals 3 and 8 denote brushes, which are held in the brush holder 1, one end of which is in sliding contact with the outer circumferential surface of a slip ring, which will be described later, and pigtails 3a and 8a fixed to the other ends, respectively.
Each spring 2, 7 is in pressure contact with a slip ring 4, which will be described later. This slip ring 4 is attached to a rotating body such as an electromagnetic clutch (not shown), and is divided into two parts 4a and 4b depending on its polarity.

Reference numerals 5 and 9 denote terminals constituting a terminal board mounted on the brush holder 1, to which pigtails 3a and 8a are soldered. 6 and 10 are lead wires from a power supply device (not shown), which are soldered to terminals 5 and 9. 11 and 13 are insulating washers 1
2, 14 and terminals 5, 9 together with a nut 21 to attach the brush holder 1 to the metal fitting 20.

Next, the operation of the conventional brush power supply device configured as described above will be explained.

First, the power supply route to the rotating body will be described from the power supply device (not shown) to the terminal 5 via the lead wire 6, and then from the pigtail 3a, brush 3, and slip ring 4a to the rotating body (not shown). Pass through the slip ring 4b, then brush 8, pigtail 8a, terminal 9, lead wire 1
0 to a power supply device (not shown) is formed.

On the other hand, regarding electrical polarity, if terminal 5 is a positive pole, terminal 9 is a negative pole. Further, when this power supply device is used for an automobile, the metal fitting 20 normally becomes a negative pole (because the negative pole of the battery is usually grounded to the automobile body, etc.). Also, brushes 3 and 8
are in pressure contact with the rotating slip rings 4a, 4b, so they gradually wear out, but since they are pressed against the slip rings 4a, 4b by the springs 2, 7, the pigtails 3a,
8a is fully extended, and the spring 4 of the brushes 3 and 8
brushes 3 and 8 until they stop moving toward a and 4b sides.
and the slip rings 4a, 4b are in contact with each other.

The aforementioned terminal holding bent portions 5a and 9
a connects the terminals 5 and 9 with the screws 11 and 13 mentioned above.
terminal 5, until it is fixed to the brush holder.
This was necessary to secure the predetermined position of the brush 9 and to prevent it from falling off the brush holder.

However, in such conventional brush power supply devices, when the brush is not worn much, the pigtail protrudes to the top of the brush holder.
There was a risk of a short circuit due to the pigtail coming into contact with the metal fittings. To prevent this, it is necessary to attach an extra insulating tube to the pigtail. In addition, there is also the disadvantage that if metal pieces fly from other sources, a short circuit will occur between the terminal plates 5, 9 and the metal fitting 20, so when further reducing the size and weight, and when installing an insulating wall to prevent the above-mentioned problems. Also, there was a cutting and bending part for holding at the part shown by B in FIG. 3, which had drawbacks such as an excessively large dimension in the X direction.

[Summary of the idea]

The purpose of the present invention is to eliminate the drawbacks of the conventional power supply device for brushes, and the purpose of the present invention is to specifically improve the terminal holding part so that the insulating wall can be increased without making the size of the brush holder larger than that of the conventional product. The present invention provides a brush power supply device that prevents the occurrence of short circuits as described above and enables power supply even if the pigtail is disconnected.

[Example of idea]

Hereinafter, one embodiment of the present invention will be described in more detail with reference to the drawings.

5 to 9 show a brush power supply device according to an embodiment of the present invention. In FIGS. 5 to 9 showing this embodiment, parts that are the same as or corresponding to those of the conventional apparatus shown in FIGS. 1 to 4 are given the same reference numerals, and their explanations are omitted.

The brush power supply device of the embodiment includes a brush holder 30 made of an insulator, and the brush holder 30 holds the springs 2, 7 and the brushes 3, 8 as in the conventional case. The terminals 50, 90 constituting the terminal plate attached to the brush holder 30 with the screws 11, 13 have holding bent portions 50a, 90a and holding dowel portions 50b, 90b, as shown in FIGS. 8 and 9. are formed respectively. These holding bent portions 50a, 90a and holding dowel portions 50b, 90b are connected to the brush holder 3.
It is fitted into holes 30a and 30b formed at 0. The brush holder 30 surrounds the terminals 50 and 90 when viewed from above.
Insulating walls 30c, 30d, 30e, 30f,
It also forms 30g. Furthermore, Terminal 5
0,90 to the brush holder 30, first insert the holding bent parts 50a, 90a into the holes 30a, then insert the holding dowel parts 50b, 9
0b into the hole 30b.

On the other hand, the ends of the springs 2 and 7 on the anti-brush side are connected to the spring contact surfaces 50 of the terminals 50 and 90.
c, 90c, holding bent portions 50a, 90
a and the holding dowel portions 50b, 90b are formed at symmetrical positions with respect to the spring contact surfaces 50c, 90c.

According to the brush power supply device of this embodiment, the holding bent portions 50a, 90a and the holding dowel portions 50b, 90b are connected to the spring contact surfaces 50c, 90.
Since it is arranged symmetrically with respect to c in the Y direction in FIG. 7, the dimension in the X direction can be reduced. In addition, if it is a conventional holding cut and bend part, the Y
Although it is conceivable to arrange it in the Y direction, this is not preferable because the dimension in the Y direction becomes large.

On the other hand, as mentioned above, one end of the springs 2, 7 is in pressure contact with the brushes 3, 8, and the other end is in pressure contact with the spring contact surfaces 50c, 90c of the terminal.
Even if the pigtails 3a, 8a are disconnected, a new advantage can be obtained in that power can be continued to be supplied via the spring.

By the way, the above-mentioned insulating walls 30c, 30d, 3
In 0e, 30f, and 30g, 30c is a central insulating wall, and 30d, 30e, 30f, and 30g are side insulating walls, respectively. This central insulating wall 3
0c prevents contact between pigtails 3a and 8a,
The insulating wall 30e also prevents the pigtail from coming into contact with the metal fitting 20. As a result, there is no need to attach an insulating tube to the pigtail as in the conventional case, and even if metal pieces fly from other sources and stick to them, the terminals 90, 50 and the metal fitting 20 will not be short-circuited or will be extremely short-circuited. It becomes difficult to do. Further, the insulating walls 30f and 30g are connected to the center point of the brush holder 30 as shown in FIG.
Terminal 5 is installed symmetrically with e.
There is no need to check the direction of the brush holder each time when assembling the brush holder 20 and the brush holder 20.

[Effect of idea]

As explained above, according to the brush power supply device of the present invention, the holding part of the terminal is arranged at a symmetrical position in the Y direction with respect to the spring contact surface, and the insulating wall is provided to surround the terminal. , the dimension in the Y direction is made small without increasing the dimension in the X direction, and while the size and weight can be achieved, there is no fear of short circuit between each component, and there is no need for an insulating tube. Furthermore, since one end of the spring that presses the brush is pressed against the terminal, power supply can be ensured even if the pigtail is disconnected.

[Brief explanation of the drawing]

FIG. 1 is a front view of a conventional brush power supply device, FIG. 2 is a side view of the brush power supply device of FIG. 1, and FIG. 3 is a top view of the brush power supply device shown in FIG. 1. , FIG. 4 is a sectional view of a conventional brush power supply device taken along the line - in FIG. 3, FIG. 5 is a front view of a brush power supply device according to an embodiment of the present invention, and FIG. 5 is a side view of the brush power supply device, FIG. 7 is a top view of the brush power supply device in FIG. 5, and FIG. 8 is a sectional view of the brush power supply device taken along the - line in FIG. 7. , Figure 9 is - of Figure 7.
Figure 8 is a cross-sectional view similar to Figure 8 taken along the line; 2, 7... Spring, 3, 8... Brush, 3
a, 8a...pigtail, 4...slip ring, 6, 10...lead wire, 30...brush holder, 50,90...terminal, 50a, 90a
...Bending part for holding, 50b, 90b... Dowel part for holding, 50c, 90c... Spring contact surface, 3
0c, 30d, 30e, 30f, 30g...Insulating wall. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims for Utility Model Registration] (1) A brush that slides into contact with the slip ring, a spring that presses the brush against the slip ring,
A brush holder that holds the spring and the brush, a terminal plate that connects one end of a lead wire to the brush and the other end of a lead wire from an external device, and a terminal board that connects one end of the spring to a part of the terminal board. A power supply for a brush, characterized in that the brush holder is provided with an insulating wall formed to abut the terminal plate, form a plurality of holding engagement parts around the abutting part, and surround the terminal plate. Device. (2) The brush power supply device according to claim 1, wherein the plurality of retaining engaging portions are comprised of retaining bent portions and retaining dowel portions.