JPH069368U - Electric brush of rotating electric machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The groove 2 or the hole 12 used to indicate the use limit of the electric brush reduces the effective contact surface of the sliding surfaces 1b and 11b with the rotating body, and the contact state deteriorates. To reduce the number of processing steps. [Structure] At least one through hole 22 or a hole 32 that does not penetrate is provided in the main bodies 21 and 31 of the electric brush in parallel with the axis of the rotating body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention generally relates to a rotating electric machine, and more particularly to a structure of an electric brush of a rotating electric machine used as a current collecting structure for passing a current from a fixed body of the rotating electric machine to a rotating body or from a rotating body to the fixed body.

[0002]

[Prior art]

 Conventionally, an electric brush and a current collecting structure have been generally used to flow electricity from a fixed body to a fixed body of a rotating electric machine, or vice versa, to the fixed body on one side and the electric brush on the other side. A copper alloy ring that makes sliding contact with the electric brush body is used, and the electric current is supplied to the electric brush body from another fixed current supply body (not shown) through a flexible conductor called a pigtail connected to the electric brush body by soldering or the like. It is supplied and flows from the sliding surface of the brush body to the ring or commutator provided on the outer periphery of the rotating body and rotating integrally with the rotating body. As a part of the structure of this type of electric brush, as shown in a front view of FIG. 5 and a side view of FIG. 6, an oblique groove 2 is provided on the surface 1a of the brush main body 1 to indicate a use limit. When the sliding surface 1b is worn, the user's attention is called up to prevent an accident due to the wear of the brush main body 1. As shown in FIG. 7, this groove has a use limit dimension (for example, 1 as a reference) of a distance L from the opening lower end 2a of the groove 2 to the outer end 1c of the contact surface between the brush body 1 and the ring 3. .5 mm) and specify the limit dimensions for use in the instruction manual, etc., and replace the brush or prepare for replacement when the sliding surface 1b wears and the distance to the lower end of the groove reaches the limit dimension. do. 8 and 9 are respectively a front view and a side view of an electric brush in which an oblique hole 12 is provided instead of the above groove, and the operation is the same as that of the groove shown in FIGS. 5 and 6.

[0003]

[Problems to be solved by the device]

 As described above, the groove 2 or the hole 12 provided for indicating the use limit of the electric brush is the sliding surface 1b with the ring or the commutator (both not shown) on the outer circumference 3a of the rotating body 3. Since it is located inside 11b, (a) the contact area becomes as small as the cross-sectional area of the groove or hole, so it is necessary to make it larger, and (b) the contact state may worsen. (C) There was a problem that the number of man-hours required to diagonally process a groove or a hole was required, and a solution was demanded.

[0004]

[Means for Solving the Problems]

 According to the present invention, the electric brush body is provided with a through hole in parallel with the axis of the rotating body, or a hole which does not penetrate is provided as a crimp, and further, a through hole which does not penetrate or a through hole which does not penetrate the above-mentioned conventional technology is formed. The above-mentioned problem was solved by using together the use limit dimension from the lower end of the opening.

[0005]

[Action]

 Since there are no through holes in the part of the brush body that slides on the rotating body, there is no reduction in the sliding area due to drilling or drilling. Since a critical dimension is set for the distance between the rotor and the outer circumference of the rotating body, accidents due to wear can be prevented.

[0006]

【Example】

1 and 2 show a front view and a side view, respectively, of a first embodiment of an electric brush according to the present invention, the electric brush comprising a substantially cubic brush body 21 and a flexible conductor 4, and a body 21 In order to prevent danger when the sliding surface 21b of the main body 21 is worn, a through hole 22 is provided above the center of the surface 21a of the main body 21 in parallel with the axis of the rotating body 3, and as shown in FIG. The use limit dimension (for example, 1.5 mm) is set at the position of the distance L ₁ from the lower end of the main body 21 toward the outer periphery 3a of the rotating body 3, and the limit mark is added to indicate that the sliding surface 21b of the body 21 is worn. If so, replace with a new electric brush.

As a second embodiment of the electric brush according to the present invention, FIG. 4 is a side view showing a hole 32 which does not penetrate, but is different only in that the hole is not penetrated. This is exactly the same as the first embodiment.

Although the case where one hole is provided has been described above, it is also possible to provide two or more holes. The current flows from the flexible conductor 4 connected to the electric brush main body 21 by soldering from a fixed body (not shown), through the brush main bodies 21 and 31 and the sliding surfaces 21b and 31b of the main body to the outer circumference of the rotating body 3. It flows to a ring or a commutator (not shown) provided in 3a or flows in the opposite direction, and the sliding surface 21b of the brush main body 21 is worn and the distance L ₁ reaches a limit value (for example, 1.5 mm). If so, replace the brush body 21 with a new one.

[0009]

[Effect of device]

 (1) Since the sliding surface of the brush body does not have cutouts such as grooves and holes, the entire cross-sectional area of the sliding surface of the brush body can be effectively used as it is as the contact area. It is not necessary to increase the size by the amount corresponding to the area of the groove or hole. (2) Since there is no cutout portion as described above, the contact with the rotating body is stable. (3) Drilling is extremely easy, and costs are reduced in terms of man-hours as compared with the conventional method.

[Brief description of drawings]

FIG. 1 is a front view showing a first embodiment of an electric brush according to the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a diagram showing a worn state of the electric brush shown in FIG.

FIG. 4 is a side view showing a second embodiment of the electric brush according to the present invention.

FIG. 5 is a front view of a conventional electric brush.

FIG. 6 is a side view of FIG.

7 is a diagram showing a state where the electric brush shown in FIG. 5 is worn.

FIG. 8 is a front view of another conventional electric brush.

9 is a side view of FIG.

[Explanation of symbols]

3 Rotating body 21 Brush body 22 Through hole 32 Hole that does not penetrate L ₁ Use limit dimension

Claims (3)

[Scope of utility model registration request] 1. An electric brush which is used by slidingly contacting a current collecting ring as a current collecting structure for supplying a current from a fixed body of a rotating electric machine to a rotating body or from the rotating body to a fixed body,
An electric brush for a rotating electric machine, wherein at least one through hole is formed in a main body of the electric brush in parallel with an axis of the rotating body to indicate a use limit of the electric brush. 2. The rotating electric machine according to claim 1, wherein the structure indicating the use limit of the electric brush is provided as at least one non-penetrating hole provided in the main body of the electric brush. Electric brush. 3. In addition to at least one through hole or a non-penetrating hole provided in the body of the electric brush to indicate the use limit of the electric brush, the above-mentioned limit as a limit for managing the use limit is provided. The rotary electric machine according to claim 1 or 2, wherein a predetermined use limit dimension is set from the lower end of the open end of the through hole or the non-through hole toward the outer end of the contact surface with the current collecting ring. Electric brush.