JPS5996686A - Brush holding mechanism for rotary electric device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brush holding mechanism for rotating electrical equipment such as a DC motor.

For example, a DC motor is generally used as a motor for starting a vehicle engine, and power is supplied to the armature of this DC motor by moving the brushes held in the brush holder against the commutator, which is a rotating contact, using the elastic force of a spring. This is done by using contact pressure. ? As shown in FIG. 2A, the power supply section of the conventional DC motor is such that a brush 35 with a power supply conductor 38 connected to the side surface is slidably held in a brush holder 37, and a spring interposed in the center of the bottom surface of the brush 35 is slidably held in the brush holder 37. Using the elastic force of 36, the tip surface was brought into contact with the surface of a commutator (rotary contact) 34.

However, according to this conventional guide, when the brush 35 slides up and down due to the elastic force of the spring 36, +811 to which the power supply conductor 38 is connected can freely move up and down due to the power supply conductor 3B. Since the Φ force is restricted, the elastic force of the spring 36 acts strongly on the part of the power supply conductor 38 that can freely move on the side opposite to the connection side. Therefore, the side that receives a strong elastic force wears out quickly, so the brush 35 has a contact surface with the commutator 34, as shown in FIG. 2B. ! As the brush wears out, it becomes slanted by the gap between both sides, shortening the life of the brush.

In view of the conventional problems mentioned above, the purpose of Misfire August is to prevent uneven wear of the brushes and extend the life of the brushes! We are trying to provide the equipment next to the equipment for maintenance.4
It's in Yuto.

The present invention achieves the above object by slidably fitting a brush into a holding hole of a brush holder, connecting a power supply conductor to the side surface of the brush, and interposing a spring to the bottom surface of the brush.
The elastic force of this spring causes the brush tip surface to become a commutator,
In a brush holding mechanism that is brought into contact with a rotating contact such as a slip ring, a special feature is that the pressing position of the spring against the bottom surface of the brush is biased toward the side surface to which the conductive wire for the conductor is connected. It is.

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows an example of a DC motor, and 1 is a cylinder 1.
2 is a permanent stone fixed to the inner surface of the yoke 1, and 3 is a t-mechanism. A commutator (rotating contact) 4 is provided at a portion g of the armature 3, and the tip end face of a brush 5 for octopus current is pressed against the surface of the commutator 4 by the elastic force of a spring 6. A power feeding groove 1i is provided on the upper surface of this brush 5.
! 8 are connected, and an external power supply is supplied to the plan, and is supplied to the armature 3 via the commutator 4.

As shown in more detail in FIG. 2, the brush 5 is held in the holding hole 7a of the flan holder 7 by sliding force, and the electric structure 3ω11- is biased by a spring 6 interposed on the bottom surface. . This spring 6 comes into contact with the bottom surface of the brush 5 at a position slightly apart from the center thereof, and the power feeding groove (98
are connected.

The side surface +'[llll is pressed against the biased position. That is, the center CI of the holding hole 7a that holds the blank 5 in a slidable manner and the holding hole 7b that holds the base end of the spring 6.
The center C2 of the holding hole 7b is different from the center C2 of the holding hole 7b.
is biased toward fllll+, where the power feeding yX-ray 8 is connected to the center C1 of the holding hole 7a.

In the DC motor brush holding mechanism described above, )
The brush 5 of the spring 6
The elastic force for is 1, which tends to restrict the sliding force Ill.
It acts strongly on the connected side of the 8 conductor wire 8 and weakly acts on the unconnected side.

Therefore, the contact pressure of the tip end surface of the brush 5 with the surface of the commutator 40 is approximately uniform over the entire surface, and uneven wear of the brush 5 is prevented.

In the above embodiment, the spring 6 is held in the holding hole 7.
b, but instead of this holding hole,
It may be held by a protrusion that fits into the middle rb of the spring 6.

As described above, in the present invention, a brush is slidably fitted into a holding hole of a brush holder, a power supply conductor is connected to the side surface of this brush, and a spring is interposed on the bottom surface, and the elastic force of this spring is used to In the brush holding bridge practice in which the brush tip surface is brought into contact with a rotating contact such as a commutator or a slip ring, the pressing position of the spring against the brush bottom surface is set as described above! 8 Since the position is biased toward the side where the power supply conductor is connected, the elastic force of the spring against the brush increases the i! of the power supply conductor. ! ! The contact pressure of the tip surface of the brush against the surface of the rotating contactor is uniform throughout, which prevents sagging and prolongs the life of the brush.

[Brief explanation of the drawing]

FIG. 1 is a partially cross-sectional side view of a straight motor with a brush retaining shaft according to the present invention, and FIG. 2 is a partially cross-sectional side view showing an enlarged power supply section of the straight motor. Year 3 figures A, B
is a side view of the power supply part of a conventional DC motor, and FIG.
Figure 3B shows the state before wear, and Figure 3B shows the state after wear.
Show it. 4...Commutator (rotating contact), 5...Brush, 6...Spring, 7...Flan holder, 7a...(Brush) holding hole, 7b...(Spring) holding hole, 8... Power supply conductor. Funeral Figure 1 21 Death Figure 3

Claims (1)

[Claims] The brush is slidably fitted into the holding hole of the brush holder,
In a brush holding mechanism in which a power supply conductor is connected to the side surface of the brush, a spring is interposed in the bottom surface, and the elastic force of the spring presses the tip surface of the brush against the rotating contact, the pressing position of the spring with respect to the bottom surface of the brush is provided. A brush holding mechanism for a rotating electric device, wherein the brush holding mechanism is biased toward a side surface to which the power supply conductive wire is connected.