JP2015027129A - Brush holder - Google Patents

Abstract

A brush holder capable of determining that a length of a brush in a pressure contact direction is equal to or less than a predetermined length is provided.
Means for determining in a holder 52 surrounding a brush so that the brush 51 is in pressure contact with a slip ring 151, that the length in the pressure contact direction of the brush becomes equal to or less than a certain length due to wear of the brush. As shown, an exposure hole 521 (confirmation hole) and a second reference line 522 (second mark) are provided. The brush 51 is provided with a first guide line 513 (first mark) indicating a guide of the length of the brush 51 to be replaced.
[Selection] Figure 2

Description

  The present invention relates to a brush holder.

  For example, a monitoring device for monitoring wear of a brush pressed against a slip ring is known. (For example, patent document 1).

Japanese Patent Laid-Open No. 2003-102150

  For example, the monitoring device of Patent Document 1 is provided with a relay device for outputting a radio signal according to the degree of brush wear. When this relay device breaks down, there is a possibility that the wear of the brush cannot be monitored.

  The main present invention for solving the above-mentioned problems is that the brush surrounds the brush so that the brush comes into pressure contact with the slip ring, and the length of the brush in the pressure contact direction is constant as the brush wears. And a means for discriminating that the length is less than or equal to the length.

  Other features of the present invention will become apparent from the accompanying drawings and the description of this specification.

  ADVANTAGE OF THE INVENTION According to this invention, the brush holder which can discriminate | determine that the length in the press-contact direction of a brush became below fixed length can be provided.

It is a figure which shows the electric power generating apparatus in 1st Embodiment of this invention. It is a perspective view which shows the slip ring and brush apparatus in 1st Embodiment of this invention. It is a side view which shows the brush apparatus in 1st Embodiment of this invention. It is a side view which shows the brush apparatus of the state in which the brush in 1st Embodiment of this invention became short. It is a perspective view which shows the slip ring and brush apparatus in 2nd Embodiment of this invention. It is a perspective view which shows the brush apparatus in 2nd Embodiment of this invention. It is a side view which shows the brush apparatus in 2nd Embodiment of this invention. It is a side view which shows the brush apparatus of the state in which the brush in 2nd Embodiment of this invention became short. It is a side view which shows the brush apparatus in 3rd Embodiment of this invention. It is a side view which shows the brush apparatus in 4th Embodiment of this invention. It is a perspective view which shows the brush apparatus in 5th Embodiment of this invention.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

[First embodiment]
=== Power generation device ===
Hereinafter, with reference to FIG. 1, the electric power generating apparatus in this embodiment is demonstrated. FIG. 1 is a diagram illustrating a power generation device according to the present embodiment.

  The power generator 100 is, for example, a rotating field generator that generates AC power. The power generation device 100 includes a stator 11, a rotor 12, a power supply device 13, slip rings 15 and 16, and brush devices 5 and 9.

  The rotor 12 is a field winding that generates a rotating magnetic field in accordance with DC power supplied from the power supply device 13. The rotor 12 is provided so as to rotate around a rotating shaft 12A along the Z axis.

  The stator 11 is an armature winding that generates AC power based on a rotating magnetic field generated by the rotor 12. The stator 11 has a cylindrical shape so that the rotor 12 is provided inside the stator 11.

  The slip rings 15 and 16 are metal commutators for supplying electric power from the power supply device 13 to the rotor 12. The rotating shaft 12A also functions as the rotating shaft of the slip rings 15 and 16. Slip rings 15 and 16 are provided at one end of rotating shaft 12 </ b> A so as to rotate together with rotor 12. The slip rings 15 and 16 are connected to one end and the other end of the winding of the rotor 12, respectively.

  The brush devices 5 and 9 are devices for supplying electric power from the power supply device 13 to the rotor 12. Since the brush devices 5 and 9 have the same configuration, only the brush device 5 will be described, and the description of the brush device 9 will be omitted. The brush device 5 will be described later.

  The power supply device 13 is a device that outputs DC power. The power supply device 13 is connected to the winding of the rotor 12 via the electric wires 53 and 93, the brush devices 5 and 9, and the slip rings 15 and 16.

  For example, when DC power is supplied from the power supply device 13 to the rotating winding of the rotor 12, AC voltage is generated at both ends of the output terminals 14 </ b> A and 14 </ b> B of the stator 11.

=== Brush device ===
Hereinafter, with reference to FIG.2 and FIG.3, the brush apparatus in this embodiment is demonstrated. FIG. 2 is a perspective view showing a slip ring and a brush device in the present embodiment. A part of the slip ring 15 and a part of the electric wire 53 are omitted for convenience of explanation. FIG. 3 is a side view showing the brush device according to the present embodiment. A part of the slip ring 15 and the electric wire 53 are omitted for convenience of explanation. A part of the brush 51, a part of the first reference line 513, and the terminal plate 514 are invisible, but are shown by dotted lines for convenience of explanation.

  The brush device 5 is a device for supplying power from the power supply device 13 to the rotor 12. The brush device 5 includes a brush 51, a casing 52 (holder), and an electric wire 53. The configuration other than the brush 51 in the brush device 5 corresponds to a brush holder.

= Brush 51 =
The brush 51 is, for example, a carbon brush for supplying a current output from the power supply device 13 to the rotor 12. The brush 51 has, for example, a substantially rectangular column shape. The brush 51 is in pressure contact with the outer circumferential surface 151 of the slip ring 15 (X axis) (pressure contact) perpendicular to the longitudinal direction (Z axis) of the rotation shaft 12A (FIG. 1) of the slip ring 15. Direction). It is assumed that the slip ring 15 rotates in the A1 direction (FIG. 2) around the rotation axis 12A along the Z axis.

  In the brush 51, it is assumed that an external force F <b> 1 is applied to the other end portion 512 of the brush 51 so that the one end portion 511 of the brush 51 is pressed against the outer peripheral surface 151 of the slip ring 15. That is, the tip (+ X) of the brush 51 is pressed against the outer peripheral surface 151 of the slip ring 15 based on the external force F1. The external force F1 is a force directed toward the slip ring 15 (+ X) in the longitudinal direction (X axis) of the brush 51. The external force F1 may be transmitted from, for example, a spring device (not shown) provided in the brush device 5. The brush 51 is electrically connected to the slip ring 15 by the press contact of the end portion 511 to the outer peripheral surface 151 of the slip ring 15.

  A terminal plate 514 is embedded on the other end 512 side of the brush 51. The terminal plate 514 is a metal plate member connected to the power supply device 13 through the electric wire 53. The current output from the power supply device 13 is supplied to the slip ring 15 via the electric wire 53, the terminal plate 514, and the brush 51.

  Further, the end portion 511 of the brush 51 is worn by friction with the outer peripheral surface 151 of the slip ring 15. Therefore, the length D1 of the brush 51 in the longitudinal direction of the brush 51 (the length of the brush 51 in the pressure contact direction) becomes shorter according to the usage period of the brush 51. Therefore, the brush 51 needs to be replaced with a new brush when the length D1 of the brush 51 becomes equal to or shorter than a predetermined length (a certain length). This is because, for example, the terminal plate 514 is prevented from coming into contact with the slip ring 15 and being damaged when the length D1 of the brush 51 is shortened. The brush 51 is provided with a first guide line 513 (first mark) indicating a guide of the length of the brush 51 to be replaced. The first reference line 513 will be described later.

= Housing 52 =
The housing 52 is, for example, a metal holder for accommodating and holding the brush 51 therein. The casing 52 has a substantially rectangular column shape. The casing 52 extends along the longitudinal direction of the brush 51. The casing 52 has a hollow structure so that the brush 51 can be accommodated and held therein. That is, the casing 52 surrounds the brush 51 so that the brush 51 is in pressure contact with the slip ring 15. The housing 52 holds the brush 51 in the housing hole 524 of the housing 52 so that, for example, the brush 51 can move along the longitudinal direction of the brush 51. The accommodation hole 524 penetrates along the longitudinal direction of the brush 51. An opening on the side close to the slip ring 15 (+ X) in the accommodation hole 524 corresponds to the first opening, and an opening on the side far from the slip ring 15 in the accommodation hole 524 (−X) corresponds to the second opening. Assume that the casing 52 is provided at a predetermined position in the power generation apparatus 100 so that the brush 51 can be held in the vicinity of the slip ring 15. The housing 52 is provided with an exposure hole 521 (confirmation hole) and a second reference line 522 (second mark).

  The exposure hole 521 is, for example, a long hole for exposing the brush 51 in the housing 52. The exposure hole 521 is provided in the side wall 523 for partitioning the inside and the outside of the housing 52. In addition, the side wall 523 is a side wall of the position which can be visually recognized by the operator who performs the operation | work which confirms the length of the brush 51 in the four side walls of the housing 52, for example. The exposure hole 521 extends along the longitudinal direction of the brush 51 so that the length D1 of the brush 51 can be confirmed (detected). The exposure hole 521 is also a hole for confirming the position of the first reference line 513. The exposure hole 521 is also a hole for notifying that the length D1 of the brush 51 is equal to or less than a predetermined length.

  The 2nd standard line 522 is a line which shows the standard of the length of the brush 51 which should replace | exchange the brush 51. FIG. The second reference line 522 will be described later.

= Wire 53 =
The electric wire 53 is a power supply line for supplying DC power (current) output from the power supply device 13 to the rotor 12. One end of the electric wire 53 is connected to the power supply device 13, and the other end of the electric wire 53 is connected to a terminal plate 514 embedded in the other end portion 512 of the brush 51.

=== First guide line, second guide line ===
Hereinafter, the first reference line and the second reference line in the present embodiment will be described with reference to FIGS. FIG. 4 is a side view showing the brush device in a state where the brush in the present embodiment is shortened. A part of the slip ring 15 and the electric wire 53 are omitted for convenience of explanation. A part of the brush 51, a part of the first reference line 513, and the terminal plate 514 are invisible, but are shown by dotted lines for convenience of explanation.

= First reference line =
The brush 51 is provided with a first reference line 513 for confirming the length D1 of the brush 51. For the brush 51, as described above, for example, when the length D1 of the brush 51 becomes a predetermined length or less in order to prevent damage to the terminal plate 514 embedded in the brush 51, a new one is obtained. It needs to be replaced with a new brush. The predetermined length is a length such that the terminal plate 514 embedded on the end 512 side of the brush 51 does not contact the slip ring 15. The predetermined length is determined according to, for example, the position where the terminal plate 514 is embedded in the brush 51, the shape of the terminal plate 514, the length of the terminal plate 514 in the longitudinal direction (X axis) of the brush 51, and the like. The predetermined length is set longer than, for example, a distance D3 (FIG. 3) from the end (−X) on the end 512 side of the brush 51 to the + X side end of the terminal plate 514.

  The first guide line 513 is provided at a position facing the exposure hole 521 so that an operator who confirms the length of the brush 51 can visually recognize the first guide line 513 through the exposure hole 521. The first reference line 513 is provided in an annular shape with respect to the outer peripheral surface of the brush 51 with the longitudinal direction of the brush 51 as an axis. With this configuration, for example, the first reference line 513 can be reliably exposed from the exposure hole 521 of the housing 52 in accordance with the length D1 of the brush 51. That is, the first reference line 513 extends in a direction intersecting the longitudinal direction of the exposure hole 521 of the housing 52. The first reference line 513 is provided at a position crossing the exposure hole 521. The first reference line 513 is provided at a position overlapping the second reference line 522 of the housing 52 when the length of the brush 51 reaches a predetermined length. The second reference line 522 will be described later.

  It is assumed that the first guide line 513 is drawn with a paint having a color different from the color other than the first guide line 513 of the brush 51. For example, the first reference line 513 may be drawn with a fluorescent paint. For example, the first reference line 513 may be drawn by a luminescent paint, a luminescent paint, or a luminous paint.

= Second guide line =
The housing 52 is provided with a second reference line 522 for confirming the length D1 of the brush 51. The second reference line 522 is provided on the side wall 523 where the exposure hole 521 is provided. For example, the second reference line 522 may be provided on all four side walls including the side wall 523 of the housing 52. The second reference line 522 is provided along a direction (Z axis) intersecting the longitudinal direction (X axis) of the exposure hole 521. The second reference line 522 is provided at a position crossing the exposure hole 521. The second reference line 522 is provided in the vicinity of the exposure hole 521. The second guide line 522 is provided at a position that overlaps the first guide line 513 of the brush 51 when the length D1 of the brush 51 reaches a predetermined length. That is, when the first reference line 513 and the second reference line 522 overlap each other, it is indicated that the length D1 of the brush 51 is a predetermined length. At this time, it is indicated that the brush 51 should be replaced with a new brush. That is, the second reference line 522 is used to determine that the length D1 of the brush 51 is equal to or less than a predetermined length in the relative positional relationship with the first reference line 513.

  The second reference line 522 is different from, for example, a color other than the second reference line 522 on the outer surface of the housing 52 so that an operator who confirms the length of the brush 51 can visually recognize the second reference line 522. It shall be drawn with colored paint. The second reference line 522 may be drawn with a fluorescent paint, for example. For example, the second reference line 522 may be drawn with a luminescent paint, a luminescent paint, or a phosphorescent paint. Further, for example, the second reference line 522 may be a groove provided in the side wall 523.

= Replacement of the first guide line and the second guide line and brush =
For example, when the first guide line 513 is provided at a position (−X) farther from the slip ring 15 than the second guide line 522 (FIG. 3), there is no need to replace the brush 51 with a new brush. Will be shown.

  On the other hand, for example, when the first guide line 513 is provided at a position (+ X) closer to the slip ring 15 than the second guide line 522 (FIG. 4), it is necessary to replace the brush 51 with a new brush. Will be shown.

=== Brush replacement ===
Hereinafter, with reference to FIGS. 3 and 4, the replacement of the brush in the present embodiment will be described.

  When power generation is performed in the power generation apparatus 100 (FIG. 1), one end 511 of the brush 51 (FIG. 3) is pressed against the outer peripheral surface 151 of the slip ring 15. One end 511 of the brush 51 is worn by friction with the outer peripheral surface 151 of the slip ring 15. The length D1 of the brush 51 in the longitudinal direction of the brush 51 is shortened according to the usage period of the brush 51. That is, the first reference line 513 of the brush 51 is used from the side far from the slip ring 15 (−X) in the longitudinal direction (X axis) of the brush 51 toward the side close to the slip ring 15 (+ X). It will move according to the period. Note that the usage period of the brush 51 is, for example, an elapsed time after the one end portion 511 of the brush 51 is pressed against the outer peripheral surface 151 of the slip ring 15 and the slip ring 15 starts to rotate.

  By confirming that the first guide line 513 has moved to a position (+ X) closer to the slip ring 15 than the second guide line 522 (FIG. 4), the terminal plate 514 in the brush 51 can come into contact with the slip ring 15. It is possible to grasp that sex has occurred. At this time, for example, the brush 51 may be replaced with a new brush. Note that the position of the first guide line 513 on the slip ring 15 side (+ X) from the position where the second guide line 522 is provided in the pressure contact direction (X axis) of the brush 51 is the length D1 of the brush 51. Corresponds to the position of the first reference line 513 indicating that the length is equal to or less than a certain length.

[Second Embodiment]
=== Brush device ===
Hereinafter, the brush device according to the present embodiment will be described with reference to FIGS. 5 and 6. FIG. 5 is a perspective view showing a slip ring and a brush device in the present embodiment. A part of the slip ring 15 and a part of the electric wire 53 are omitted for convenience of explanation. FIG. 6 is a perspective view showing the brush device in the present embodiment. A part of the electric wire 53 is omitted for convenience of explanation. FIG. 6 is a perspective view showing the brush device in the present embodiment. A part of the electric wire 53 is omitted for convenience of explanation. 5 and 6, the same reference numerals are given to the same components as those in FIG. 2, and the description thereof is omitted.
The brush device 5B has a display piece 6 (projection piece).

= Display piece =
The display piece 6 is, for example, an elastic piece for notifying (notifying) that the length D1 (FIG. 1) of the brush 51 has become a predetermined length or less. The display piece 6 may be a flexible member made of resin or rubber, for example. The display piece 6 has a substantially rectangular shape. The display piece 6 is provided in a gap between the side wall 523 of the housing 52 and the brush 51. In the direction in which the side wall 523 and the brush 51 are adjacent to each other (Y axis), a gap in which the display piece 6 is provided is formed between the side wall 523 and the brush 51. The display piece 6 is provided inside the accommodation hole 524 in a state where the display piece 6 is bent around the bending portion 63 along the rotation axis 12A (Z axis) of the slip ring 15, for example. One end 61 (FIG. 6) of the display piece 6 is fixed to the side wall 523 with an adhesive, for example. That is, one end 61 is fixed so as to contact the inside of the casing 52. One end 61 of the display piece 6 has the other end 62 (FIG. 8) of the display piece 6 when the display piece 6 returns to its original shape by the elastic force of the display piece 6 (FIG. 8). It is provided at the edge of the side wall 523 on the side (−X) far from the slip ring 15 so as to protrude and be exposed. Note that the return of the display piece 6 to the original shape will be described later. The display piece 6 is bent against the elastic force of the display piece 6 so that the other end 62 of the display piece 6 is provided between the one end 61 and the brush 51. The display piece 6 extends in a direction (−X) away from the slip ring 15 in the longitudinal direction (X axis) of the brush 51 inside the accommodation hole 524 and then extends in a direction (+ X) approaching the slip ring 15. It is bent back. The other end 62 of the display piece 6 comes into contact with the brush 51 inside the accommodation hole 524. That is, the display piece 6 is maintained in a bent state by the contact (contact) of the other end 62 with the brush 51.

  For example, when the display piece 6 is irradiated with light so that an operator who confirms the length of the brush 51 can visually recognize the display piece 6 that has returned to its original shape, the display piece 6 It may be formed of a material that reflects light. For example, the display piece 6 may be coated with a paint that reflects the light when the display piece 6 is irradiated with light, for example. Further, for example, the display piece 6 may be coated with a fluorescent paint, a luminescent paint, a luminescent paint, or a phosphorescent paint.

=== Shape of display piece ===
Hereinafter, the shape of the display piece in the present embodiment will be described with reference to FIGS. 7 and 8. FIG. 7 is a side view showing the brush device in the present embodiment. A part of the slip ring 15 and the electric wire 53 are omitted for convenience of explanation. A part of the brush 51, a part of the first reference line 513, the terminal board 514, and the display piece 6 are invisible, but are shown by dotted lines for convenience of explanation. FIG. 8 is a side view showing the brush device in a state where the brush in the present embodiment is shortened. A part of the slip ring 15 and the electric wire 53 are omitted for convenience of explanation. A part of the brush 51, a part of the first reference line 513, a part of the display piece 6, and the terminal board 514 are invisible, but are shown by dotted lines for convenience of explanation. In FIGS. 7 and 8, the same components as those in FIGS. 3 and 4 are denoted by the same reference numerals, and the description thereof is omitted.

= Bent display piece =
The display piece 6 is provided in the accommodation hole 524 (FIG. 6) in a bent state. At this time, the display piece 6 generates an elastic force (hereinafter, also referred to as “undoing force”) for returning the shape of the display piece 6 to the original shape (substantially rectangular shape). It is assumed that the display piece 6 is bent in a range in which the shape of the display piece 6 returns to the original shape based on the restoring force. The other end portion 62 of the display piece 6 rotates around the bent portion 63 (FIG. 6). When the length D1 (FIG. 2) of the brush 51 is longer than the predetermined length, the other end 62 of the display piece 6 comes into contact with the brush 51. The rotation of the other end 62 is stopped by contact with the brush 51. Therefore, the display piece 6 is maintained in a bent state. As described above, when the length D1 of the brush 51 is longer than the predetermined length, the display piece 6 is not exposed from the housing 52 (FIG. 7). That is, at this time, the display piece 6 is retracted inside the housing 52.

= Display piece returned to its original shape =
One end 511 of the brush 51 is worn by friction with the outer peripheral surface 151 of the slip ring 15. At this time, the length D1 of the brush 51 is shortened according to the usage period of the brush 51. When the length D1 of the brush 51 is equal to or less than the predetermined length, the end on the other end 512 side of the brush 51 is more slippery than the tip of the other end 62 of the display piece 6 in the bent state. It moves to the side (+ X) close to. The display piece 6 is provided at a position where the other end 62 does not face the brush 51 when the length D1 of the brush 51 becomes a predetermined length or less. At this time, the other end 62 of the display piece 6 is not in contact with the brush 51. The other end 62 rotates around the bending portion 63 so that the display piece 6 returns to its original shape before being bent by the elastic force of the display piece 6. A part of the display piece 6 on the other end 62 side protrudes from the housing 52 toward the opposite side (−X) to the slip ring 15. As described above, when the length D1 of the brush 51 is equal to or less than the predetermined length, the display piece 6 is exposed from the housing 52 (FIG. 8).

=== Brush replacement ===
Hereinafter, with reference to FIGS. 7 and 8, the replacement of the brush in the present embodiment will be described.

  When power generation is performed in the power generation apparatus 100 (FIG. 1), one end 511 of the brush 51 (FIG. 7) is pressed against the outer peripheral surface 151 of the slip ring 15. One end portion 511 is pressed against the outer peripheral surface 151 of the slip ring 15 by an external force F1 applied to the other end portion 512 of the brush 51. When the length D1 of the brush 51 is longer than the predetermined length, the display piece 6 is not exposed from the housing 52.

  One end 511 of the brush 51 is worn by friction with the outer peripheral surface 151 of the slip ring 15. The length D1 of the brush 51 in the longitudinal direction of the brush 51 is shortened according to the usage period of the brush 51. When the length D1 of the brush 51 becomes equal to or shorter than the predetermined length, the display piece 6 protrudes from the housing 52 and is exposed.

  It can be grasped that the terminal plate 514 in the brush 51 may come into contact with the slip ring 15 due to the exposure of the display piece 6 from the housing 52. At this time, for example, the brush 51 may be replaced with a new brush.

[Third embodiment]
=== Brush device ===
Hereinafter, the brush device according to the present embodiment will be described with reference to FIG. FIG. 9 is a side view showing the brush device in the present embodiment. A part of the slip ring 15 and the electric wire 53 are omitted for convenience of explanation. A part of the brush 51, a part of the first reference line 513, and the terminal plate 514 are invisible, but are shown by dotted lines for convenience of explanation. 9, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof is omitted.

The brush device 5 </ b> C has a housing 72.
The housing 72 is provided with an exposure hole 721 and a scale 722.
The exposure hole 721 has the same configuration as the exposure hole 521 in the first embodiment.
The scale 722 is a scale for grasping the length D1 (FIG. 2) of the brush 51. The scale 722 is provided on the side wall 723 provided with the exposure hole 721 in the housing 72. For example, an operator who confirms the length of the brush 51 grasps the length D1 of the brush 51 based on the relative positional relationship between the scale 722 and the first reference line 513 exposed from the exposure hole 721. Can do.

[Fourth embodiment]
=== Brush device ===
Hereinafter, the brush device according to the present embodiment will be described with reference to FIG. FIG. 10 is a side view showing the brush device in the present embodiment. A part of the slip ring 15 and the electric wire 53 are omitted for convenience of explanation. A part of the brush 51, a part of the first reference line 513, and the terminal plate 514 are invisible, but are shown by dotted lines for convenience of explanation. 10, the same reference numerals are given to the same components as those in FIG. 3, and the description thereof is omitted.

The brush device 5D has a housing 82.
The casing 82 is provided with a plurality of exposure holes 831 to 837 (confirmation holes).
The plurality of exposure holes 831 to 837 are, for example, substantially rectangular holes for exposing the brush 51 in the housing 82. The plurality of exposure holes 831 to 837 are provided in the side wall 823 having the same configuration as the side wall 523 of the first embodiment. The plurality of exposure holes 831 to 837 are arranged along the longitudinal direction (X axis) of the brush 51 so that it can be confirmed that the length D1 of the brush 51 is equal to or less than a certain length. The plurality of exposure holes 831 to 837 are provided at positions corresponding to positions at which the exposure holes 521 (first embodiment) are provided. The plurality of exposure holes 831 to 837 are arranged at regular intervals, for example. For example, the exposure holes 831 to 833 are provided on the slip ring 15 side (+ X) with respect to the position of the first reference line 513 when the length D1 of the brush 51 becomes a certain length. Further, the exposure holes 834 to 837 are provided, for example, on the side (+ X) opposite to the slip ring 15 side with respect to the position of the first reference line 513 when the length D1 of the brush 51 becomes a certain length. I will do it. That is, at least the exposure holes 834 to 837 among the plurality of exposure holes 831 to 837 are provided in a range until the length D1 of the brush 51 becomes a certain length. That is, for example, an operator who confirms the length of the brush 51 determines whether the first guide line 513 is exposed from which one of the plurality of exposure holes 831 to 837. It is possible to determine that the length D1 is equal to or less than a certain length. For example, when the first reference line 513 is exposed from one of the exposure holes 831 to 833, it can be determined that the length D1 of the brush 51 is equal to or less than a certain length. On the other hand, for example, when the first reference line 513 is exposed from one of the exposure holes 834 to 837, it can be determined that the length D1 of the brush 51 is longer than a certain length.

  Further, for example, an operator who confirms the length of the brush 51 determines the end of the brush 51 based on which of the exposure holes 831 to 833 the first reference line 513 is exposed from. The degree of risk that the terminal plate 514 embedded on the 512 side comes into contact with the slip ring 15 (also referred to as “risk of damage to the slip ring 15”) can be grasped. For example, when the first guide line 513 is exposed from the exposure hole 832, the risk of damage to the slip ring 15 is higher than when the first guide line 513 is exposed from the exposure hole 833. can do. Further, for example, when the first guide line 513 is exposed from the exposure hole 831, the risk of damage to the slip ring 15 is higher than when the first guide line 513 is exposed from the exposure hole 832. Can be grasped.

[Fifth Embodiment]
=== Brush device ===
Hereinafter, the brush device according to the present embodiment will be described with reference to FIG. FIG. 11 is a perspective view showing the brush device in the present embodiment. A part of the electric wire 53 is omitted for convenience of explanation. A part of the brush 51 and a part of the notification device 8 are invisible, but are indicated by dotted lines for convenience of explanation. In addition, the same code | symbol is attached | subjected to the structure similar to FIG. 6 in FIG. 11, and the description is abbreviate | omitted.
The brush device 5E has a notification device 8.

=== Notification device ===
The notification device 8 is a device that notifies that the length D1 (FIG. 2) of the brush 51 has become a predetermined length or less. The notification device 8 includes a projecting piece 80, a housing 81, and a contact piece 82.

  The housing 81 is a case that houses the protruding piece 80. The housing 81 has, for example, a substantially rectangular column shape. The casing 81 is provided inside the accommodation hole 524. The casing 81 is provided between the side wall 523 and the brush 51. The casing 81 is fixed to the side wall 523 with an adhesive or the like, for example. The housing 81 is provided with an opening 81 </ b> A for projecting or retracting the projecting piece 80. The opening 81 </ b> A is provided on the −X side of the housing 81 so that the protruding piece 80 protrudes on the side (−X) opposite to the slip ring 15 (FIG. 2) side.

  The projecting piece 80 has a substantially rectangular shape, for example. The projecting piece 80 is provided inside the projecting piece 80 so as to protrude from the inside of the housing 81 to the outside of the housing 81 and to be retracted from the outside of the housing 81 to the inside of the housing 81. The projecting piece 80 is biased in a direction toward the opposite side (−X) from the slip ring 15 side by, for example, an elastic device. The protrusion 80 is permitted or prohibited to move by a stopper device (not shown) that permits or prohibits the movement of the protrusion 80 according to the position of the contact piece 82.

  The contact piece 82 is a piece for detecting that the length D1 of the brush 51 is equal to or less than a predetermined length. The contact piece 82 protrudes toward the brush 51. The contact piece 82 is attached to the housing 81 so as to be movable in a direction (Y axis) intersecting the longitudinal direction of the brush 51. The contact piece 82 is urged in a direction from the housing 81 side toward the brush 51 side. For example, when the length D1 of the brush 51 is longer than a predetermined length, the contact piece 82 contacts the brush 51. The position of the contact piece 82 when the contact piece 82 is in contact with the brush 51 is also referred to as a first position. In addition, for example, when the length D1 of the brush 51 is equal to or less than a predetermined length, the contact piece 82 is detached from the brush 51. At this time, the contact piece 82 moves to the second position in the direction away from the housing 81 (+ Y).

  The stopper device permits the movement of the protrusion piece 80 or prohibits the movement of the protrusion piece 80 based on the position of the contact piece 82. For example, when the contact piece 82 moves to the first position, the stopper device prohibits the movement of the contact piece 82, and when the contact piece 82 moves to the second position, the stopper device moves the contact piece 82. Permission to move is allowed.

  For example, when the length D <b> 1 of the brush 51 is longer than a predetermined length, the movement of the projecting piece 80 is prohibited, and the projecting piece 80 is retracted inside the housing 81. Further, for example, when the length D1 of the brush 51 is equal to or less than a predetermined length, the movement of the protruding piece 80 is permitted and the protruding piece 80 protrudes outside the housing 81.

  As described above, the brush device 5 includes the housing 52 and the exposure hole 521. The casing 51 is a holder that surrounds the brush 51 so that the brush 51 is pressed against the slip ring 15. The exposure hole 521 is provided in the housing 52. The exposure hole 521 makes it possible to determine that the length D1 (FIG. 2) in the pressure contact direction (X axis) of the brush 51 has become a certain length or less as the brush 51 is worn. Therefore, it is possible to provide the housing 52 of the brush device 5 that can determine that the length D1 of the brush 51 in the pressure contact direction is equal to or less than a certain length. An operator who confirms the length of the brush 51 can easily and reliably determine that the length D1 of the brush 51 is equal to or less than a certain length. Therefore, the accuracy of work by this worker can be improved.

  A first reference line 513 is provided on the outer surface of the brush 51. The exposure hole 521 is a confirmation hole for confirming that the first reference line 513 has moved to a predetermined position. An operator who confirms the length of the brush 51 visually confirms the position of the first reference line 513 through the exposure hole 521, thereby confirming that the length D1 of the brush 51 is equal to or less than a predetermined length. Can be determined. Therefore, it is possible to reliably determine that the length D1 of the brush 51 is equal to or less than a certain length with a relatively simple configuration.

The brush 51 has a column shape extending in the pressure contact direction of the brush 51. The exposure hole 521 is a long hole extending in the pressure contact direction of the brush 51. Therefore, it can be continuously confirmed that the length of the brush 51 is shortened as the brush 51 is worn. Therefore, it can be reliably determined that the length D1 of the brush 51 is equal to or less than a certain length.
A second reference line 522 is provided on the outer surface of the casing 52. The second reference line 522 is provided in the vicinity of the exposure hole 521. The second reference line 522 is used to determine that the length D1 of the brush 51 in the pressure contact direction is equal to or less than a certain length in the relative positional relationship with the first reference line 513. Therefore, it is possible to provide the housing 52 of the brush device 5 that can easily and reliably determine that the length D1 of the brush 51 is equal to or less than the predetermined length.

  The casing 82 of the brush device 5D is provided with a plurality of exposure holes 831 to 837 along the pressure contact direction (X axis) of the brush 51. At least the exposure holes 834 to 837 among the plurality of exposure holes 831 to 837 are provided in a range until the length D1 of the brush 51 becomes a certain length. Therefore, based on which of the plurality of exposure holes 831 to 837 the first reference line 513 is exposed, it is confirmed in stages that the length of the brush 51 is shortened as the brush 51 is worn. can do. Therefore, it can be reliably determined that the length D1 of the brush 51 is equal to or less than a certain length.

  The brush device 5 </ b> B includes a housing 52 and a display piece 6. A housing hole 524 is provided in the housing 52. When the length D <b> 1 of the brush 51 in the pressure contact direction is longer than a certain length, the display piece 6 is in a state of being retracted inside the housing 52. When the length D <b> 1 of the brush 51 in the pressure contact direction is equal to or less than a certain length, the display piece 6 protrudes outside the housing 52. Therefore, it is possible to provide the housing 52 of the brush device 5B that can easily and reliably determine that the length D1 of the brush 51 is equal to or less than a certain length.

  The display piece 6 is an elastic piece. One end 61 of the display piece 6 is fixed so as to contact the inside of the housing 52. The other end 62 of the display piece 6 is in contact with the brush 51 inside the housing 52. At this time, the display piece 6 is bent against the elastic force of the display piece 6. When the length D1 of the brush 51 in the pressure contact direction is longer than a certain length, the display piece 6 is maintained in a bent state. When the length D1 of the brush 51 in the pressure contact direction is equal to or less than a certain length, the display piece 6 is elastic so that the other end 62 of the display piece 6 is detached from the brush 51 and protrudes to the outside of the casing 52. Based on the original state. Therefore, it is possible to reliably determine that the length D1 of the brush 51 is equal to or less than a certain length based on a relatively simple structure.

  The display piece 6 is coated with a fluorescent paint. Therefore, when the brush device 5 is provided in a relatively dark place, it can be reliably determined based on the fluorescence of the display piece 6 that the length D1 of the brush 51 is equal to or less than a certain length.

  The first to fifth embodiments are intended to facilitate understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  In the first embodiment, it has been described that the colors of the first reference line 513 and the portion of the brush 51 other than the first reference line 513 are different from each other, but the present invention is not limited to this. For example, the colors of the outer surface of the housing 52 and the outer surface of the brush 51 may be similar to each other, and the color of the inner surface of the housing 52 may be different from the colors of the outer surface of the housing 52 and the screen of the brush 51. In this case, the inner surface of the casing 52 is exposed through the exposure hole 521 as the length D1 of the brush 51 becomes shorter. Then, an operator who confirms the length of the brush 51 can grasp the length D1 of the brush 51 based on the exposure amount of the inner surface of the housing 52 exposed through the exposure hole 521.

  Moreover, in 1st Embodiment, although brush 51 was accommodated by the metal housing 52, it was not limited to this. For example, the brush 51 may be accommodated by a colorless and transparent resin casing. Further, dust generated based on wear of the brush 51 may be removed using wind pressure based on rotation of the slip ring 15.

  In the first embodiment, it has been described that one exposure hole 521 and one second guide line 522 are provided for the housing 52, but the present invention is not limited to this. For example, a plurality of exposure holes 521 and a plurality of second reference lines 522 may be provided with respect to the housing 52 along the longitudinal direction (X axis) of the brush 51.

  Moreover, although 1st Embodiment demonstrated that the brush 51 was exhibiting the rectangular column shape, it is not limited to this. For example, the brush 51 may have a cylindrical shape or a polygonal column shape.

5, 5B, 5C, 5D, 5E Brush device 6 Display piece 15, 16 Slip ring 51 Brush 52, 72, 82 Housing 513 First guide line 521, 721 Exposed hole 522 Second guide line

Claims (8)

A holder surrounding the brush so that the brush is pressed against the slip ring;
Means for determining that the length in the pressure-contact direction of the brush is equal to or less than a certain length due to wear of the brush;
A brush holder characterized by comprising. The brush has a first mark on the outer surface;
The brush holder according to claim 1, wherein the means is a confirmation hole for confirming that the first mark has moved to a position indicating the predetermined length or less. The brush has a column shape extending in the pressure-contact direction of the brush,
The brush holder according to claim 2, wherein the confirmation hole is a long hole extending in a pressure contact direction of the brush. The holder is provided in the vicinity of the elongated hole on the outer surface of the holder, and in a relative positional relationship with the first mark, the length in the pressure contact direction of the brush is equal to or less than the predetermined length. The brush holder according to claim 3, further comprising a second mark for discrimination. The said confirmation hole is provided with two or more along the press-contact direction of the said brush in the range until the length in the press-contact direction of the said brush becomes the said fixed length. Brush holder. The means is a protruding piece that is provided in a gap between the brush and the holder and informs that the length of the brush in the pressure contact direction is equal to or less than a certain length.
The holder exposes a first opening that exposes a first end of the brush that is pressed against the slip ring, and a second end that exposes a second end of the brush opposite to the first end. An opening, and
When the length in the pressure contact direction of the brush is longer than a certain length, the protruding piece is retracted inside the holder, and when the length in the pressure contact direction of the brush is equal to or less than a certain length, The brush holder according to claim 1, wherein the brush holder protrudes outside the holder. The projecting piece is fixed so that one end of the projecting piece comes into contact with the inside of the holder, and the other end of the projecting piece comes into contact with the brush and bends against an elastic force. Elastic pieces that are
When the length in the pressure-contact direction of the brush is longer than a certain length, the elastic piece is maintained in a bent state,
When the length of the brush in the pressure contact direction is equal to or less than a certain length, the elastic piece is based on elastic force so that the other end of the protruding piece is detached from the brush and protrudes to the outside of the holder. The brush holder according to claim 6, wherein the brush holder is in an original state. The brush holder according to claim 6 or 7, wherein the projecting piece is coated with a fluorescent paint.

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