JPH0714267B2 - Brush holder for motor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a brush holder used in a motor.

[Prior Art] Conventionally, the following technology is known as a structure of a brush holder used for a DC motor.

That is, in a conventional motor 30, as shown in FIG. 6, a flat plate-shaped brush holder side plate 15 is fitted and fixed to the opening end step of a substantially cup-shaped stator 32, and an insulating resin 22 provided on the brush holder side plate 15 is attached. The base end of the brush 19 is attached via the, and the tip end side is in sliding contact with the commutator 35. The commutator 35 is a rotary shaft whose both ends are supported by bearings 24 and 37.
The lead end of the coil wound around a substantially cylindrical rotor 36 mounted on the rotating shaft 31 is connected to the terminal. In addition, this rotor 36
Faces a cylindrical drive magnet 33 fixed to the inner peripheral surface of the stator case 32.

Further, the base end of the brush 19 attached to the brush holder side plate 15 is connected to the circuit board 18 via two terminals 23, one end of which is led to the outside, as shown in FIG.

The circuit board 18 is made of phenolic resin or the like, and a plurality of circuit components 17 are arranged on the brush holder side plate 15 side to form a control circuit for controlling the rotation speed of the motor 30.

[Problems to be Solved by the Invention] In such a conventional motor, the circuit board 18 and the brush holder side plate 15 provided with the brush 19 are connected to the terminal 23.
Since the circuit board 18 is composed of separate parts, the number of parts is increased by the number of the circuit boards 18, which complicates the assembly work and increases the cost. Further, since the circuit boards 18 are arranged so as to overlap each other in the axial direction, it is difficult to flatten the axial direction.

Further, in order to omit the circuit board 18, conventionally, an insulating layer such as an enamel insulating film is formed on the brush holder side plate 15 itself,
There is also an example in which a series of processes for printing a circuit pattern on this surface is performed to form a metal core wiring board, and circuit parts and brushes are arranged on the circuit pattern. However, the cost of the brush holder and the circuit board are low, and the brush holder and the circuit board are not easy to assemble.

[Object of the Invention] The present invention improves the structure of the brush holder of the motor,
A circuit pattern, a circuit component, a brush mechanism component, and the like are integrated into a simple and inexpensive structure.

[Means for Solving Problems] In order to achieve the above object, the brush holder of the motor of the present invention exposes a metal plate formed in advance in a circuit pattern shape and most of one surface side of the metal plate. At the same time, a substrate on which the resin plate is molded and mounted on the other surface side of the metal plate, a circuit component such as a control circuit connected to the metal plate of the substrate, and the resin plate are integrally molded. And a brush mechanism part directly mounted on the brush fixing base and connected to the metal plate, and a bearing held in a recess molded integrally with the resin plate. .

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings. The components of the motor 30 other than the brush holder 10 are the same as those in FIG. 6 described above, and a description thereof will be omitted.

1 to 3, a resin plate 1 made of synthetic resin
A concave portion 1a is formed substantially in the center, and a bearing 6 is attached to the concave portion 1a so as to be aligned. On the surface of the resin plate 1 on the side of the recess 1a, a metal pattern plate 2 made of a metal plate formed in a circuit pattern forming a desired control circuit is mounted by insert molding to form a substrate 3.

The metal pattern plate 2 is a wiring component which is made of metal such as a steel plate or a copper plate and which connects a predetermined circuit component 4 to form a control circuit. The metal pattern plate 2 has a plurality of insulating grooves and component insertion holes 8 through which lead terminals of the circuit component 4 are inserted so that the metal plate has a circuit pattern shape.

A rim portion 1b is integrally formed on the peripheral edge of the resin plate 1 opposite to the metal pattern plate 2, and a substrate 3 that is inside the rim portion 1b is formed.
A circuit component 4 such as an integrated circuit 4a, a capacitor 4b and a resistor 4c is disposed on the surface of, and the lead terminal of each circuit component 4 is inserted into the component insertion hole 8 and connected to the metal pattern plate 2. A control circuit is constituted by the. Further, a brush mechanism part 5 including a brush 5a having a vibration isolator 5d attached thereto and a terminal 5b is attached to a brush fixing base 5c formed on a part of the resin plate 1 on the end side. The brush 5a is
The terminal 5b fitted into the split groove 5e formed in the brush fixing base 5c is connected to one end of the terminal 5b by welding or the like, and the other end of the terminal 5b is connected to the metal pattern plate 2 by soldering or the like.

The circuit component 4, the brush mechanism component 5, the bearing 6 and the like are mounted on the substrate 3 on which the resin plate 1 and the metal pattern plate 2 are integrally formed as described above to form the brush holder 10.

Explaining the method of manufacturing the substrate 3, the metal pattern plate 2 is made of a metal plate such as a steel plate or a copper plate by pressing a number of insulating grooves 7 and the component insertion holes 8 as shown in FIG. Alternatively, the holes are formed by etching or the like.
At this time, a plurality of connecting portions 12 are formed between the insulating grooves 7 of the metal pattern plate 2 to connect the patterns. Next, the metal pattern plate 2 is placed in a mold (not shown), and the resin plate 1 is insert-molded to form the substrate 3 on which the metal pattern plate 2 and the resin plate 1 are integrally mounted. At this time, the resin plate 1 has the above-mentioned connecting portion 12
A cutting hole 9 is formed at a position corresponding to, and after a molding process, a cutting punch is inserted into the cutting hole 9 by a press or the like to cut several connecting portions 12 to separate a predetermined circuit pattern. Is formed.

Further, in order to strengthen the connection between the metal pattern plate 2 and the resin plate 1, the convex portion 11 is formed integrally with the resin plate 1 so that the metal pattern plate 2 is sandwiched.

The component insertion hole 8 may be bored before the molding, or may be bored after the molding, depending on the ease of making the molding die. Further, the metal pattern plate 2 may be attached to one surface of the resin plate 1 which is molded in advance by adhesion, or may be attached by using other fixing means.

FIG. 4 shows another embodiment of the present invention in which a piece 2a of the metal pattern plate 2 is provided perpendicularly to the plane of the metal pattern plate and integrally molded in the brush fixing base 5c to fix the brush. In this example, the brush 5a is electrically connected to the tip of the piece 2a protruding above the table 5c, and the terminal 5b is omitted.

The present invention is not limited to the above-mentioned embodiment,
With the brush holder 10 in which the metal pattern plate 2 is integrally mounted on the resin plate, the metal pattern plate 2 may be mounted on both surfaces of the resin plate 1, or the brush mechanism component 5 and the circuit component 4 may be mounted.
May be provided on the metal pattern plate 2 side. Further, the shape of the substrate 3 may be changed to a quadrangle, a polygon, or the like according to the shape of the motor.

Further, if the metal pattern plate 2 is formed of a magnetic material such as an iron plate, it has a shielding effect and prevents magnetic or electric noise in the motor 30 from being radiated to the outside. in this case,
When the insulating groove 7 is narrowed to increase the area of the metal pattern plate 2 or the metal pattern plate 2 is thickened, the shield effect is increased.

[Effects of the Invention] According to the present invention described above, a metal plate previously formed in a circuit pattern shape is molded to form a substrate, so that a brush holder with a circuit substrate can be easily manufactured. Since the brush mechanism component can be directly attached to the brush fixing base integrally formed with the resin plate by molding and the brush mechanism component can be connected to the metal plate of the substrate, the number of components can be reduced and the flattening in the axial direction can be achieved. That is, it can be made thin. Further, since the concave portion which is the holding portion of the bearing is formed integrally with the resin plate, the number of parts can be reduced and the fixing accuracy of the bearing is improved. Further, since most of the one side of the circuit pattern metal plate is exposed, the heat dissipation effect can be enhanced by connecting a circuit component such as an integrated circuit to this metal plate.

[Brief description of drawings]

1 to 4 show an embodiment of the present invention, FIG. 1 is a plan view of a brush holder according to the present invention, FIG. 2 is a rear view of FIG. 1, and FIG. 3 is a cross section of FIG. 4 and 5 are sectional views showing another embodiment of the brush portion according to the present invention, FIG. 5 is a sectional view showing a conventional example, and FIG. 6 is a sectional view of a conventional motor. 1 ... Resin plate, 2 ... Metal pattern plate, 3 ... Substrate, 4
...... Circuit parts, 5 …… Brush mechanism parts, 30 …… Motor, 35 …… Commutator.

Claims (1)

[Claims] 1. A metal plate formed in advance in a circuit pattern,
A substrate on which most of one surface side of the metal plate is exposed and a resin plate is molded and mounted on the other surface side of the metal plate, and a control circuit connected to the metal plate of the substrate. A circuit component, a brush mechanism component directly mounted on a brush fixing base molded integrally with the resin plate and connected to the metal plate, and held in a recess molded integrally with the resin plate. Brush holder for the motor, which is equipped with a bearing.