JPH0753401Y2 - Brush motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a brush motor having a commutator element and a brush that is in sliding contact with the commutator element to supply an electric current.

[Conventional technology]

In general, a brush motor is provided with a holding member for holding the brush that is in sliding contact with the commutator piece, and the brush is attached to and detached from the holding member in order to facilitate replacement of the brush that has worn down due to long-term use.

In such a brush holding structure, by making a holding member including the brush project toward the outer cylinder side of the housing, the diameter of the commutator piece is increased and the number of divided commutator pieces is increased.
There are two types of types in which a brush holding member including a brush is housed in the inner cylinder side of the housing to reduce the size in the radial direction, but the latter type is used when the size of the device is required to be reduced.

[Problems to be solved by the device]

However, in the latter type, if the brush is moved as close to the outer cylinder direction of the housing as possible so that the number of divisions of the commutator piece can be increased, it is difficult to replace the brush and connect the lead wires. is there.

[Purpose of device]

In view of such a problem, the present invention provides a brush-equipped motor that can increase the number of divisions of commutator pieces as much as possible and can facilitate brush replacement and lead wire connection at this time. The purpose is to do.

[Means for Solving the Problems]

According to the present invention, a notch having a predetermined size is formed in the vicinity of the rear end of the brush in the housing, and the notch is closed, and a partition wall is attached so that the outer surface is substantially flush with the outer surface of the housing. By doing so, the above object is achieved.

[Action]

According to the above configuration, the brush and the lead wire can be replaced with the partition wall removed. Then, the space reserved for performing such work can be utilized for increasing the diameter of the commutator piece, and the number of divisions of the commutator piece can be increased accordingly.

〔Example〕

 Hereinafter, the present invention will be described with reference to examples.

1 to 3 show an embodiment of the present invention,
FIG. 1 is a perspective view of a brush holding portion, FIG. 2 is a plan view, and FIG.
The figure is a sectional view taken along the line AA in FIG.

In these figures, 1 is a housing, 2 is a rotor shaft 15
The commutator pieces 3 arranged at are brushes that are in sliding contact with the commutator piece 2. This brush 3 is fitted into a recess 4 provided in the inner cylinder 1A of the housing 1 with a holding guide 5 as a brush holding member interposed, and fixed by mounting a terminal 6 as a coupling means in the opening of the recess 4. It A lead wire 7 is soldered to the terminal 6 and led out to the outside. Further, the brush 3 held by the holding guide 5 is biased toward the commutator 2 by an elastic member such as a spring 8 interposed between the rear end portion and the rear end portion of the holding guide 5.

On the other hand, in the vicinity of the rear end of the brush 3 in the outer cylinder 1B of the housing 1, a notch 9 having a size suitable for work such as soldering.
The notch 9 is provided with a partition wall 10 as a partition member which is inserted and fitted from the axial direction so that the outer surface of the notch 9 is substantially aligned with the outer surface of the outer cylinder 1B. This bulkhead 10
The engaging portions 10A are formed on both sides of the notch 9, and the engaging portions 9A are formed on both sides of the notch 9 on the inner cylinder side so as not to drop in the outer cylinder direction. The partition wall 10 is fitted into the notch 9 and then fixed by a cap 11 shown in FIG. 3 so as not to fall off in the axial direction.

Therefore, according to this structure, when the brush 3 is attached, the brush 3 is fixed to the recess 4 of the inner cylinder 1A via the holding guide 5, the terminal 6 is attached, and then the lead wire 7 is attached to the terminal 6. And solder the partition 10 to the notch 9
The procedure is such that the outer cylinder 1B is opened by the notch 9, but the work is facilitated. In addition, the space secured on the inner cylinder side of the housing 1 for performing work such as soldering can be used for increasing the diameter of the commutator piece 2.

Further, since the outer surface of the partition wall 10 is substantially coincident with the outer surface of the housing 1, it is possible to prevent the protruding portion of the housing 1 in the outer surface direction from being reduced and the space occupied in the radial direction of the motor from increasing. be able to.

Further, since the partition wall 10 is fixed by the cap 11, the partition wall 10 cannot be removed even if it is attempted to be removed during rotational driving, and it is possible to prevent accidental mischief by the user. Further, when necessary, the partition wall 10 can be removed and a cap 11 can be attached to serve as a viewing window for checking the contact state between the brush 3 and the commutator piece 2.

Although the partition wall 10 is an independent member in this embodiment, a flexible holder 12 is provided outside the holding guide 5 as shown in another embodiment of FIG.
The partition 13 may be configured to be bendable at the rear end portion of the brush.

[Effect of device]

As described above, according to the present invention, since the outer cylinder of the housing is provided with the notch, it is possible to easily replace the brush and connect the lead wire. Further, the space reserved for performing such work can be utilized for increasing the diameter of the commutator piece, and the number of divisions of the commutator piece can be increased correspondingly, and the space of the motor can be increased. It becomes possible to extend the life. Further, since the outer surface of the partition wall member that covers the cutout portion substantially coincides with the outer surface of the housing, it is possible to prevent the protruding portion in the outer diameter direction from decreasing and the space occupied in the radial direction of the motor from increasing. .

[Brief description of drawings]

1 to 3 are views showing an embodiment of the present invention. FIG. 1 is a perspective view of a brush mounting portion, FIG. 2 is a plan view of the brush mounting portion, and FIG. AA sectional view, FIG. 4 is a side view showing another embodiment of the present invention. 1 ... Housing, 2 ... Commutator piece 3 ... Brush, 4 ... Recessed portion 5 ... Holding guide (brush holding member), 6 ... Terminal (coupling means) 7 ... Lead wire, 8 ... Spring ( Elastic member 9 ...... Notch 10, 13 ...... Partition wall (Partition member) 11 ...... Cap 12 ...... Holder 15 ...... Rotor shaft

Claims (3)

[Scope of utility model registration request] 1. A brush motor having a housing, a commutator piece provided in the housing at one end of a rotor shaft, and a brush slidingly contacting the commutator piece. An inner cylinder and an outer cylinder, a brush holding member that holds the brush toward the commutator piece, and an inner cylinder that fits the brush holding member in a direction that faces the commutator piece. The outer cylinder at a position corresponding to the recess of the inner cylinder is provided with a notch for assembling work, and the outer surface is substantially flush with the outer surface of the outer cylinder. A brush-equipped motor having a partition member covering the cutout portion. 2. The motor with brush according to claim 1, wherein the partition wall member is inserted and fitted in the cutout portion of the outer cylinder in the rotor axial direction of the housing. 3. The brush motor according to claim 1, wherein the partition wall member is formed so as to be bendable at a brush rear end side portion of a holding member that holds the brush.