JPH0615482Y2 - Brush holder stay structure for rotating electric machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a brush holder stay structure in a rotating electric machine such as a motor.

[Problems to be Solved by Prior Art and Invention] Generally, in this type of rotating electric machine, a brush that is in sliding contact with the commutator in an elastic pressure state is attached. By the way, the number of poles has recently been increased to improve performance. So, taking the case of a 6-pole motor as an example, this is because the brushes on the plus side and minus side have an angle of 60 degrees. As a result, the distance between adjacent brushes becomes narrower.

However, in the past, the connection part of the pigtail that was pulled out from the brush holder was on the side of the brush holder mounting surface where there was not enough space, so workability when incorporating the brush into the brush holder and sliding property of the brush should be considered. If the pigtail is set to be long, the pigtail 8 may interfere with the ammunition 7 that urges the adjacent brush 6, as shown in FIG.
Further, if the insulation distance is secured to avoid the interference between the two, there is an inconvenience that the size is inevitably increased.

Further, as shown in Japanese Utility Model Application Laid-Open No. 49-70406, a groove-shaped insertion portion is formed in the outer peripheral edge portion of the brush holder stay, and the pigtail is pulled out to the other surface side which has a space through the insertion portion. , It is proposed to adopt the technology of connecting this pigtail to the connection part that protrudes to the other surface side, but in this thing, although the pigtail is pulled out to the other surface side through the insertion part, Because the pigtail resonates with the vibration of the brush or the vibration of the vehicle that occurs due to the sliding contact with the commutator, the pigtail resonates at the connection because it is immediately connected to the connection part that is projected at the groove bottom position. There is a risk of direct conduction, resulting in poor electrical continuity at the connection due to metal fatigue associated with vibration.In addition, if the spacing between adjacent brushes is reduced to accommodate multiple poles, the pigtails will also be shortened. Since that can not but, will be sliding properties of workability and brush when incorporating the brush to the brush holder is inferior, been made but can not be adopted immediately.

[Means for Solving the Problem] In view of the above-mentioned circumstances, the present invention was devised with the object of providing a brush holder stay structure in a rotating electric machine that can eliminate these next points, and a pigtail Is a brush holder stay to which a brush holder for accommodating a brush is attached on one surface side, and a groove-shaped pigtail whose outer peripheral side is opened so that the pigtail drawn out from the brush holder is inserted into the brush holder stay and pulled out to the other surface side. The insertion part, a pigtail connection part that is arranged with a gap in the circumferential direction with respect to the pigtail insertion part, and is projected to the other surface side to connect the tip part of the pigtail, and the periphery of the pigtail insertion part. Adjacent to each other in the direction, to support from the outer peripheral side the pigtail that is routed in the circumferential direction from the pigtail insertion portion to the pigtail connection portion. It is characterized in that a pigtail support portion protruding to the other surface side is integrally formed.

With this configuration, the present invention prevents the interference with the adjacent brush urging ammunition while maintaining the assembling workability by ensuring a sufficient pigtail length even when the brush interval is narrowed in response to the increase in the number of poles. Moreover, it is possible to prevent the vibration of the pigtail from being directly transmitted to the pigtail connecting portion, and reliably prevent the occurrence of conduction failure in the pigtail connecting portion.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. In the drawing, reference numeral 1 is a yoke of a six-pole motor, a rotor 2 is rotatably supported by the yoke 1, and a permanent magnet 3 is integrally fixed to the inner peripheral surface of the yoke.
Reference numeral 4 denotes a brush holder stay fitted in the yoke 2.
Two sets of brush holders 5 are attached to one surface side of the brush holder stay 4, and each set of brush holders 5 has 6
It is located side by side at an angle of 0 degrees. 6 is a brush holder 5
The brush 7 is fitted inside so as to be movable in the radial direction, and 7 is an ammunition for elastically pressing the brush 6. The ammunition 7 is attached to a supporting piece 5a formed adjacent to one side of the brush holder 5. The center part is integrally attached to the spring spring type, and its free end contacts the outer surface of the brush 6 so that the brush 6 is elastically pressed toward the commutator 2a side provided on the rotor 2. It is supposed to do.

Reference numeral 8 denotes a pigtail whose one end is connected to the brush 6, and the pigtail 8 is pulled out from the groove portion 5b formed in the brush holder 5. Further, the pulled pigtail 8 is the brush holder stay 4 Groove-shaped pigtail insertion part 4a formed by cutting out so that the outer peripheral side is opened at the outer edge of the
It is designed to be pulled out to the other side through.

The other side of the brush holder stay 4 is adjacent to the pigtail insertion portion 4a in the circumferential direction, and the pigtail insertion portion 4a.
A pigtail supporting portion 4b for supporting the pigtail 8 drawn out to the other surface side from the outer peripheral side through the protrusion is formed.
As a result, the pigtail 8 passing through the pigtail insertion portion 4a is laid out in the circumferential direction to reliably restrict the withdrawal from the pigtail insertion portion 4a, and it is possible to effectively suppress the vibration of the pigtail 8. ing.

Further, on the other surface side of the brush holder stay 4, a pigtail 8 connecting portion 4c for connecting the tip end portion of the pigtail 8 is formed. The pigtail connecting portion 4c is based on the support of the pigtail supporting portion 4b. In order to connect the tip end portion of the pigtail 8 along the circumferential direction to the pigtail support portion 4b in the circumferential direction, and to connect on the center side of the pigtail support portion 4b, a step L is formed in the radial direction from the pigtail support portion 4b. The protrusion is formed so as to be located at a position substantially the same in diameter as the groove bottom position of the pigtail insertion portion 4a. The reference numeral 9 designates an insulating plate fixed to the brush holder stay 4 for forming a pole opposite to the pole on which the present invention is implemented.

In the embodiment of the present invention constructed as described, the brush 6
Is elastically urged toward the commutator 2a side by the ammunition machine 7 on one surface side of the brush holder stay 4, but the pigtail 8 connected to the brush 6 is attached to the side where the brush holder 5 is attached as in the conventional case. Is not wired as it is, and is drawn out to the other surface side through the pigtail insertion portion 4a provided in the brush holder stay 4, and the pigtail 8 drawn out to the other surface side is arranged in the circumferential direction of the pigtail insertion portion 4a. After being routed in the circumferential direction while being supported by the adjacent pigtail support parts 4b from the outer peripheral side, the pigtail support parts 4b are connected to the pigtail connection parts 4c adjacent in the circumferential direction. That is, the pigtail 8 that has been pulled out to the other surface side through the pigtail insertion portion 4a can effectively suppress the vibration based on the supporting action of the pigtail support portion 4b, so that the vibration of the pigtail 8 generated on the one surface side remains as it is. It is possible to reliably prevent conduction to the connecting portion 4c. Therefore, it is possible to completely eliminate the inconvenience that the pigtail connecting portion 4c has poor conduction due to metal fatigue due to vibration, and as a result, it is possible to significantly improve durability and reliability.

Moreover, since the pigtail insertion portion 4a has a groove shape in which the outer peripheral side is opened, the work of passing the pigtail 8 through the pigtail insertion portion 4a to the other surface side can be extremely facilitated and the work load can be reduced. However, since the pigtail 8 pulled out to the other surface side is supported from the outer peripheral side by the pigtail support portion 4b adjacent in the circumferential direction of the pigtail insertion portion 4a, it is likely to come out from the pigtail insertion portion 4a. There is no inconvenience.

Further, since the pigtail 8 can be extended in length by the amount of the other side being laid around, the required length can be secured and multipolarization can be achieved even when the interval between the adjacent brushes 6 is narrowed. Can be dealt with easily.

In addition, since the pigtail connecting portion 4c is formed so as to project toward the center with a step L with respect to the pigtail supporting portion 4b, the tip end portion of the pigtail 8 connected to the outer peripheral surface side of the pigtail connecting portion 4c is It is also possible to prevent the brush holder stay 4 from protruding from the outer periphery, and further contribute to facilitating the wiring work of the pigtail 8.

Needless to say, the present invention is not limited to the above-mentioned embodiment, and is not limited to a 6-pole motor, but a multi-pole rotating electric machine such as an 8-pole motor or a rotating electric machine such as a 4-pole motor. Also in the case, it can be implemented when necessary. Further, the pigtail of the brush holder stay, which is pulled out to the side opposite to the brush holder mounting surface, may be bent and wired to the adjacent brush side, which is opposite to the above-described embodiment, and the degree of freedom in design is secured. There is also.

[Advantages] In summary, since the present invention is configured as described above, the pigtail connected to the brush is pulled out to the other surface side through the pigtail insertion portion formed in the brush holder stay. However, the pigtail that is pulled out to the other surface side is routed in the circumferential direction in a state where it is supported from the outer peripheral side by the pigtail support portion that is adjacent in the circumferential direction of the pigtail insertion portion, and then the pigtail support portion. Will be connected to adjacent pigtail connections in the circumferential direction. In other words, the pigtail that has been pulled out to the other side through the pigtail insertion part suppresses vibration based on the supporting action of the pigtail support part, so the vibration of the pigtail generated on the one side is directly transmitted to the pigtail connection part. It can be surely prevented. Therefore, there is no inconvenience that conduction failure occurs in the pigtail connecting portion due to metal fatigue associated with vibration, and as a result, durability and reliability can be significantly improved.

Moreover, since the pigtail insertion portion has a groove shape with an outer peripheral side opening, it is extremely easy to pull the pigtail through the pigtail insertion portion to the other surface side, but the pigtail extended to the other surface side is Since it is supported from the outer peripheral side by the pigtail support portions that are adjacent to the insertion portion in the circumferential direction, it is possible to reliably prevent the inconvenience of slipping out of the pigtail insertion portion.

Also, since the pigtail can be extended in length by the amount of the other side being pulled around, even if the distance between adjacent brushes is narrowed, the required length can be secured without interference. It is possible to easily deal with multi-polarization.

[Brief description of drawings]

The drawings show an embodiment of a brush holder stay structure in a rotating electric machine according to the present invention. FIG. 1 is a sectional view of a motor, FIG. 2 is a front view of the brush holder stay, and FIG. FIG. 4 is a rear view of the brush holder stay, and FIG. 5 is a front view of the conventional brush holder stay. In the figure, 4 is a brush holder stay, 4a is a pigtail insertion portion, 4b is a pigtail support portion, 4c is a pigtail connection portion, 5 is a brush holder, 6 is a brush, 7 is an ammunition machine, and 8 is a pigtail.

Claims (1)

[Scope of utility model registration request] 1. A brush holder stay in which a brush holder for accommodating a brush with a pigtail is mounted on one surface side,
A groove-shaped pigtail insertion portion having an outer peripheral side opening for inserting the pigtail drawn out from the brush holder into the brush holder stay so as to be drawn out to the other surface side, and is arranged with a gap in the circumferential direction with respect to the pigtail insertion portion. , Adjacent to the pigtail connecting portion projecting to the other surface side to connect the tip end of the pigtail and the pigtail inserting portion in the circumferential direction, and pulling in the circumferential direction from the pigtail inserting portion to the pigtail connecting portion. A brush holder stay structure in a rotating electric machine, wherein a pigtail support portion projecting to the other surface side is integrally formed to support the rotated pigtail from the outer peripheral side.