JPS6219089Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a brush device, and in particular to a brush device that increases the range of effective use of brushes used in rotating electric machines equipped with a commutator. It is something.

[Conventional technical description]

FIG. 3 is a partially sectional front view showing a conventional brush device, and FIG. 4 is a side view of FIG. 3. In FIGS. 3 and 4, the brush 1 is constructed by mixing approximately equal amounts of graphite powder and copper powder, for example, and sintering the mixture after pressure molding. The conductor (pigtail) 2 is
One end thereof is integrally fixed to the head, which is one end of the brush 1. The holding frame 3 holds the brush 1 in the third position.
It is held so as to be slidable in the vertical direction as shown in FIGS.
One end of the helical spring 4 engages with the head of the brush 1, and presses the lower surface, which is the other end surface, of the brush 1 against the commutator 5. The machine frame 6 is a frame body of a DC rotating electric machine, and houses the above-mentioned parts.

Next, this operation will be explained. Due to the pressure of the helical spring 4, the lower surface of the brush 1 is pressed against the commutator 5, and DC current is supplied to the commutator 5 via the conductor 2, thereby performing DC motor rectification. During this rectifying action, the brush 1 used in the DC motor for starting the internal combustion engine has a large amount of wear due to the large load current density.
The wear amount range l shown in the figure is set to the required length.

[Problem that the invention attempts to solve]

However, as shown in FIG. 3, since the distance p between the commutator 5 and the machine frame 6 is limited, there is a drawback that a sufficient wear range l cannot be secured.

The object of this invention is to provide a brush device that eliminates the above-mentioned drawbacks of the conventional brush device and has an increased wear range.

[Means for solving problems]

The brush device according to this invention forms a convex part and a concave part at one end of the brush, and fixes one end of the conductive wire to the side surface of the convex part substantially orthogonally to the pressing direction of the brush.
A spring that pressed against the brush was engaged in the recess.

[Effect]

One end of the conductor is fixed to the side surface of the convex part almost perpendicular to the pressing direction of the brush, and the spring is engaged with the concave part to press the brush, thereby separating the pressing surface of the brush against the commutator and one end of the conductor. The distance between the fixed parts of the brush is increased to increase the abrasion range of the brush.

〔Example〕

An embodiment of this invention will be described below with reference to the drawings.

FIG. 1 is a partial front view showing an embodiment of the brush device according to the invention, and FIG. 2 is a side view of FIG. 1. In FIGS. 1 and 2, the brush 1 is
For example, graphite powder and copper powder are mixed in approximately equal amounts,
It is configured by being sintered after pressure forming, and a convex portion 101 and a concave portion 102 are formed in the head portion, which is one end portion. The conductive wire (pigtail) 2 has one end fixed to the side surface of the convex portion 101 so as to be substantially orthogonal to the pressing direction of the brush 1 . The holding frame 3 holds the brush 1 slidably in the vertical direction in FIGS. 1 and 2. One end of the helical spring 4 engages with the upper end surface of the recess 102, and presses the other end of the brush 1, which is the lower surface, against the commutator 5. The machine frame 6 is a frame body of a DC rotating electric machine, and houses the above-mentioned parts.

Note that the portion where one end of the conductive wire 2 is fixed to the convex portion 101 and the portion where the one end of the helical spring 4 is engaged with the recess 102 are configured to be at substantially the same horizontal position.

This invention is constructed as described above, and does not require a space for installing the helical spring 4 within the distance p as in the conventional case. Therefore, the wear amount range m shown in FIG.
This can be made sufficiently larger than the conventional wear range l shown in the figure, and the range of effective use of the brush 1 can be increased.

In the above embodiment, the effect on a DC motor for starting an internal combustion engine has been described, but the same effect can be obtained on any rotating electric machine having a commutator.

[Effect of idea]

As described above, according to this invention, since one end of the brush is provided with a convex portion to which a conductor is connected and a concave portion in which a helical spring is engaged, the commutator and machine frame are not changed. This has the effect of increasing the range of changes that can be used even if the brush is worn out, that is, the range of effective use, and extending the life of the device at low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view showing an embodiment of the brush device according to this invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a partially sectional front view showing a conventional brush device, and FIG. is a side view of FIG. 3; In the figures, the same parts in each figure are given the same symbols, 1 is a brush, 101 is a convex part, 102 is a recessed part, 2 is a conducting wire, 3 is a holding frame, 4 is a helical spring,
5 is a commutator, and 6 is a machine frame.

Claims (1)

[Claims for Utility Model Registration] (1) A brush with a convex portion and a concave portion formed at one end and whose other end face is pressed against a commutator; A brush device comprising conductive wires fixed substantially orthogonally to each other, and a spring that engages with the recess and presses the other end surface of the brush against the commutator. (2) The brush device according to claim 1, wherein the point where one end of the conductive wire is fixed to the convex portion and the point where the spring is engaged with the concave portion are substantially in the same horizontal position.