JPH061965B2 - Brush holder device for rotating electric machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a brush holder device for a rotary electric machine that is used, for example, as a starter for starting an internal combustion engine.

[Conventional technology]

In recent years, as a social need, there is a tendency toward downsizing, and rotating electrical machines are also downsizing. Therefore, it is necessary to reduce the diameter of the brush holder that holds the brush.

[Problems to be solved by the invention]

However, particularly in a small-sized and high-output 6-pole, 8-pole, multi-pole DC rotating machine, the number of brushes is large because it is multi-pole, and the brush size is large because it is high-power. Therefore, the distance between the positive electrode brush and the spring that presses the brush and the negative electrode brush and the brush spring is short, the number of parts is increased or the structure is complicated for insulation when the brush pigtail is routed. However, the problem is that the cost must be increased due to the downsizing, and in the worst case insulation is difficult, so the miniaturization must be abandoned, the brush holder diameter must be increased, and the yoke diameter must be increased more than necessary. there were.

[Means for solving problems]

Therefore, the present invention is a brush having a brush pressing end that presses a brush against a commutator, a brush spring having a coil portion, a brush insertion portion into which the brush is inserted, and an arm that holds the coil portion of the brush spring. A brush holder device for a rotary electric machine, comprising: a holder, and a pigtail of the brush being held at an end of an arm of the brush holder.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings. Reference numeral 1 is a yoke, and a magnet 2 forming a field with 6 poles is provided on the inner circumference.
Is fixed. An armature 3 is arranged inside the magnet 2, and an armature shaft 3 a of the armature 3 is rotatably supported by an end frame 4 via a bearing 5. 6 is a commutator fixed to the outer periphery of the armature shaft 3,
It is connected to the coil of the armature 3. The yoke 1 and the end frame 4 are spigot-coupled with spigot portions 1a and 4a.

Reference numeral 7 is made of resin, and is a ring-shaped brush holder, and four pairs of brush insertion walls 7a and 7b forming a brush insertion portion whose one side in the axial direction is opened are integrally molded. A cylindrical wall 7c is formed on the inner circumference of the brush holder 7, and
A window portion 7d through which the brush 8 penetrates is integrally formed at a position of the wall 7c facing between the insertion walls 7a and 7b. Reference numeral 7 is an arm for mounting a brush spring. A protrusion 7f is formed on the inner peripheral side of the tip of the arm 7e, and a concave portion 7g is formed in the circumferential direction on the tip surface of the arm 7e.

Reference numeral 8 is a brush that is inserted between the pair of insertion walls 7a and 7b of the brush holder 7, and a brush pressing groove 8a is formed at the tip.

Reference numeral 9 denotes a brush spring, the coil portion 9a of the brush spring 9 is fitted to the arm 7e, and the brush pressing end 9b of the brush spring 9 has a brush pressing groove 8a of the brush 8.
, And the brush 8 is pressed against the commutator 6 through the window 7d. The brush spring 9 is a reaction force that presses the brush 8 so that the coil portion 9a moves into the protrusion 7f of the arm 7e.
This prevents the arm 7e from slipping out.

Reference numeral 10 denotes a pigtail of the brush 8, and the two negative-side pigtails 10a are inserted into the recess 7g of the arm 7e and are connected to the ground circuit connector 11, respectively.
Further, the two positive electrode-side brush pigtails 10b pass through the cutout portion 7h formed on the outer periphery of the brush holder 7,
It is taken out from the back surface (the surface opposite to where the brush 8 is arranged) and connected to the M terminal 12 (terminal on the positive electrode side of the power supply).

The brush holder 7 includes the end frame 4 and the yoke 1.
It is sandwiched between and and fixed by spigot coupling at spigot parts 4a and 1a. At this time, the arm 7e of the brush holder 7
The concave portion 7g is covered with the inner peripheral surface 4b of the end frame 4, so that the pigtail 10a is reliably held in the concave portion 7g.

Therefore, since the pigtail 10 is held in the concave portion 7g of the arm 7e for holding the brush spring 9, the brush pigtail 10 can be arranged on the brush spring 8 in a stacked manner, and the size reduction in the radial direction can be achieved. In addition, the insulation with respect to other parts is also ensured. Further, since the brush pigtail 10 is held by being sandwiched between the concave portion 7g and the inner peripheral surface 4a of the end frame 4, there is no need to lengthen the entire length excessively, and the pigtail 10 is better than the brush spring 9 Since it is always fixed at a high position, it does not get caught in the coil portion 9a of the brush spring 9.

In the second embodiment shown in FIG. 3, the recess 7 of the arm of the plush holder 7e is formed on the inner peripheral surface 4a of the end frame 4.
A protrusion 4b to be inserted into the recess 7g is integrally formed at a position facing g. Then, in the assembled state, the protrusion 4 b of the end frame 4 causes the pigtail 1 to move.
It holds and holds the pigtail 10 within the elasticity range of 0.

Therefore, as the effect of the second embodiment, in addition to the effect of the first embodiment, since the brush pigtail 10 is fixed between the protrusion 4b of the end frame 4 and the recess 7g of the arm 7e, vibration resistance is improved. Can be improved. Further, since the concave portion 7g of the brush holder 7 and the protrusion 4b of the end frame 4 are fitted to each other, the arm 7e for holding the brush spring 9 of the brush holder 7 is tilted toward the outer peripheral side by the reaction force of the brush spring 9. Not only can it be prevented from falling, but it can also serve as positioning between the brush holder 7 and the end frame 4.

In the third embodiment and the fourth embodiment shown in FIGS. 4 and 5, the brush holder plate 20 is provided with a rectangular brush holder box 21 formed of, for example, an iron plate, and is held in the axial direction so as to project. The portion 22 is integrally formed, and the holding portion 22 has a plate-shaped spiral spring 2
3 is inserted. Further, one end of the spring 23 presses the end surface of the brush 24 inserted into the box 21. Then, the pigtail 25 of the brush 24 is
Welding to the tip of 2 or to the tip 22 of the holder 22,
The pigtail 25 may be fitted.

〔The invention's effect〕

As described above, in the present invention, since the pig pigtail of the brush is held at the end of the arm that holds the brush spring, the brush pigtail can be arranged on the brush spring, and the brush holder is small in the radial direction. There is an excellent effect that it can be realized and the pigtail is not caught in the brush spring.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an essential part of a first embodiment of a brush holder device for a rotating electric machine according to the present invention, FIG. 2 is a front view of the brush holder in FIG. 1, and FIG. A cross-sectional view showing an essential part of a second embodiment of a brush holder device for a rotating electric machine of the present invention, FIGS. 4 and 5 are essential parts of a third embodiment and a fourth embodiment of the rotating electric machine brush holder device of the present invention. FIG. 6 ... Commutator, 7 ... Brush holder, 7a, 7b ... A pair of insertion walls forming a brush insertion portion, 7e ... Arm, 7g ... Recessed portion, 8 ... Brush, 9 ... Brush spring, 9a ... Coil portion, 9b ... Brush pressing end , 10 ... Pigtail.

Claims (4)

[Claims] 1. A brush having a brush pressing end for pressing the brush against the commutator, a brush spring having a coil portion, a brush insertion portion into which the brush is inserted, and an arm for holding the coil portion of the brush spring. A brush holder device for a rotating electric machine, comprising: a holder, wherein a pigtail of the brush is held at an end of an arm of the brush holder. 2. The brush holder is made of resin, and a recess is formed at an end of the arm, and a pigtail of the brush is inserted and held in the recess. Item 3. A brush holder device for a rotating electric machine according to item. 3. The brush holder for a rotary electric machine according to claim 2, wherein the arm is made to project toward the end frame, and the recess of the arm is covered by the inner circumference of the end frame. apparatus. 4. The end frame is formed with a protrusion that is inserted into a recess of the arm of the brush holder, and a pigtail of the brush is sandwiched between the recess and the protrusion. A brush holder device for a rotating electric machine according to claim 3.