JPH083177Y2 - Motor brush holder structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a brush holder structure of a motor having a carbon brush.

[Prior Art] As is well known, in a general DC motor, a field magnet and a brush are provided on the stator (stator) side, and a winding and a commutator are provided on the rotor (rotor) side. The direction of the current in the winding is switched by mechanical sliding with the brush. There are two types of brushes: a carbon brush made of carbon as a raw material (carbon brush) and a metal brush obtained by processing a metal material into a mesh shape or a plate shape. Generally, a carbon brush is used. The carbon brush is held by a brush holder as a holder, and is pressed against the commutator with a predetermined pressure by a pressurizing means such as a coil spring in order to obtain a good rectifying function. FIG. 3 is a conventional example showing a brush holder structure of a motor, 1 is a carbon brush, 2 is a connecting conductor made of a copper wire or the like for supplying an electric current to the carbon brush 1, and 3 is a carbon brush 1.
Is a coil spring as a pressurizing means for pressing against the commutator 4, 5 is a brush holder for accommodating the carbon brush 1 and the coil spring 3, and 6 is a terminal. The brush holder 5 is formed into a rectangular tubular body whose surface facing the commutator 4 is open, and the open end 7 of the brush holder 5 is formed on one side surface 5a.
There is a guide groove 8 for a connection conductor that opens at the end, and one end of the connection conductor 2 is connected and fixed to the carbon brush 1 through the connection conductor guide groove 8.

[Problems to be Solved by the Invention] However, in such a conventional brush holder structure, since the connecting conductor guide groove 8 is opened at the open end 7 of the brush holder 5, the carbon brush 1 is worn and shortened. In that case, there is a problem that the brush is dropped from the brush holder 5 to cause a motor lock, or the connection conductor 2 is short-circuited.

Therefore, the present invention has been made in view of the above-mentioned problems, and an object thereof is to reliably prevent the connecting conductor, the carbon brush, and the pressing means from coming off and coming off from the brush holder with a relatively simple structure. An object of the present invention is to provide a brush holder structure for a motor.

[Means for Solving the Problems] In order to achieve the above object, the present invention is provided on one side surface of a brush holder which is formed in a tubular body having one end open and which accommodates a carbon brush and a pressing means. A guide groove for a connecting conductor to be opened is formed, the connecting conductor is connected to the carbon brush through the guide groove, and a bendable connection that is cantilevered at the open end of the guide groove for the connecting conductor and is orthogonal to the guide groove. It is provided with a conductor removal prevention piece.

[Operation] In the present invention, the connection conductor guide groove has the connection conductor slip-out prevention piece at the opening end to prevent the connection conductor from slipping out. Therefore, the carbon brush and the pressurizing means are not removed from the brush holder.

[Embodiment] Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a perspective view showing an embodiment of a brush holder structure for a motor according to the present invention, and FIG. 2 is a perspective view showing a state in which an opening end of a guide groove for a connecting conductor is opened. In addition, in the figure
The same components as those shown in the figure are designated by the same reference numerals, and the description thereof will be omitted. In these figures, in this embodiment, the opening end 8a of the connecting conductor guide groove 8 is closed on one side surface 5a of the brush holder 5 in which the connecting conductor guide groove 8 is formed to prevent the connecting conductor 2 from coming off. It is characterized in that a connecting conductor slip-out preventing piece 11 is provided. The connecting conductor slip-out preventing piece 11 is perpendicular to the longitudinal direction of the guide groove 8 so as to communicate with the connecting conductor guide groove 8 at a portion of the one side surface 5a of the brush holder 5 which is separated from the open end 7 by an appropriate distance. It is constituted by a tongue-shaped plate portion between the formed cutout groove 12 and the open end 7. Other configurations are the same as those in FIG.

In such a structure, when the carbon brush 1 and the coil spring 3 are assembled in the brush holder 5, the connecting conductor slip-out preventing piece 11 is bent upward as shown in FIG. 2 to open the connecting conductor guide groove 8. 8a is opened, the carbon brush 1 and the coil spring 3 are inserted into the brush holder 5, and at the same time, the connection conductor 2 is inserted into the connection conductor guide groove 8 from the opening end 8a. As shown in FIG. 1, the brush holder 5 may be returned to its original state so that the brush holder 5 has one side surface 5a substantially flush with the open end 8a of the connecting conductor guide groove 8.

According to the brush holder structure having such a configuration, however, the opening end 8a of the connection conductor guide groove 8 is closed by the connection conductor slip-out preventing piece 11 to prevent the connection conductor 2 from slipping off. 1 and the coil spring 3 can be reliably prevented from falling off from the brush holder 5. Further, if the carbon brush 1 and the coil spring 3 do not fall off, short circuit of the connection conductor 2 can be prevented. Furthermore, since the connection conductor drop-out prevention piece 11 is integrally provided on the brush holder 5, the connection conductor drop-out prevention piece 11 can be easily formed without increasing the number of parts.

[Effects of the Invention] As described above, according to the brush holder structure for a motor of the present invention, a bendable connecting conductor that is cantilevered at the opening end of the guide groove for the connecting conductor of the brush holder and is orthogonal to the guide groove. Since the removal prevention piece is provided and the prevention piece prevents the connection conductor from coming off from the connection conductor guide groove, it is possible to reliably prevent the carbon brush and the pressing means from coming off from the brush holder, It is possible to prevent a failure of the motor, a short circuit of the connecting conductor, and the like. In particular, in the present invention, when the brush is assembled, the opening of the guide groove is opened by previously bending the rising prevention piece so as to be orthogonal to the upper surface of the brush holder, and then guiding the connection conductor in this state. Insert the brush into the brush holder at the same time as inserting it into the groove, and then fold the pull-out prevention piece back to the original state to close the open end of the guide groove. Since it is possible to completely close the open end of the guide groove with the slip-off preventing piece, it is possible to reliably prevent the brush from slipping off or falling off. Further, the structure can be simplified and the device can be manufactured at low cost, which is a great practical effect.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a brush holder structure of a motor according to the present invention, FIG. 2 is a perspective view showing a state in which an opening end of a guide groove for a connecting conductor is opened, and FIG. 3 is a conventional brush. It is a perspective view of a holder structure. 1 ... Carbon brush, 2 ... Connection conductor, 3 ... Coil spring (pressurizing means), 4 ... Commutator, 5 ... Brush holder, 5a ... One side, 7 ... Open end of brush holder, 8 ... guide groove for connecting conductor, 8a ... open end, 11 ... connecting conductor slip-out preventing piece.

Claims (1)

[Scope of utility model registration request] 1. A guide groove for a connecting conductor, which is open at its open end, is formed on one side surface of a brush holder which is formed in a tubular body having one end open and which houses a carbon brush and a pressing means.
The connecting conductor is connected to the carbon brush through the guide groove, and a bendable connecting conductor pull-out preventing piece that is cantilevered and is orthogonal to the guide groove is provided at the opening end of the connecting conductor guide groove. Motor brush holder structure.