JPH0134537Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an electric actuator that is applied to electrically operate movable objects such as door locks of automobiles, opening and closing of choke valves, and power windows.

Conventionally, in this type of electric actuator, as means for fixing the power supply brush that supplies power to the commutator of the motor, a single motor is constructed separately from the actuator box, and the motor is housed and installed in the actuator box. Alternatively, a structure is known in which a power supply brush support is press-fitted or integrally molded into a part of the actuator box through an insulating material.

However, in the former case, the motor box is separate from the actuator box, which not only increases the weight but also increases the number of parts such as wiring materials required to supply current to the motor. However, there are drawbacks such as increased assembly man-hours and higher costs.

In addition, in the latter case, after the power supply brush support is press-fitted or integrally molded into a part of the actuator box, a separate part for power supply is required, making automatic assembly difficult. There are some difficulties.

This idea was made in order to solve the above-mentioned conventional problems.The motor is installed on a printed circuit board provided with a conductive material for power supply, and the commutator of the motor is located at a predetermined position on the printed circuit board. In addition, a brush holder holding a power supply brush is fitted and held, and the brush holder is electrically connected to a conductive pattern on a printed circuit board, thereby simplifying the structure and reducing costs.

Hereinafter, this invention will be explained in detail based on drawings showing examples thereof.

1 to 4, reference numeral 1 denotes a printed circuit board 1, on the surface of which a conductive pattern 2 for power supply such as copper foil is arranged, and at a predetermined position avoiding the conductive pattern. The motor 3 is positioned at.

There is a rotor 5 in the case 4 of the motor 3, and one end of a rotating shaft 7 supporting a commutator 6 is rotatably supported via a bearing 8 provided on the base A of the actuator. The other end side of the rotating shaft 7 is operatively connected to a worm gear 10 via a worm 9 which is a driving part.
A bearing 11 and a worm gear bearing (not shown) are provided on the printed circuit board 1.

The printed circuit board 1 has comb-like protrusions 1a and 1b formed in the vicinity of the commutator 6 of the motor 3.
The conductive pattern 2 for power feeding is formed on the surfaces of the protrusions 1a and 1b, and each of the protrusions 1a and 1b has a
Brush holders 13 made of a conductive material that fixedly hold the power supply brushes 12 are fitted and held, respectively, and power is supplied to the commutator 6 from the power supply conductive pattern 2 on the printed circuit board 1.

In the illustrated example, the brush holder 13 has elastic clamping pieces 13a, 13b formed by bending on the mounting portions fitted to the protrusions 1a, 1b of the printed circuit board 1.
are integrally formed, and have a structure in which they are elastically fitted and held by the protrusions 1a and 1b of the printed circuit board 1.

Therefore, according to the above configuration, the positional relationship between the power feeding brush 12 and the commutator 6 is set mechanically by fitting the brush holder 13 onto the printed circuit board 1, and electrically the positional relationship between the power feeding brush 12 and the commutator 6 is set by fitting the brush holder 13 onto the printed circuit board 1. 1 conductive pattern 2 to brush holder 13
and the commutator 6 via the power supply brush 12.
Power is supplied to the

What is shown in FIGS. 5A and 5B is another embodiment of the brush holder, in which brush holder bodies 15 and 1 fixing the power supply brush 12 are shown.
A single elastic clamping piece 15 by bending is attached to the proximal end of 6.
a, 16a are integrally formed, and this clamping piece 15
A, 16a are designed to be fitted and held on the edge of the printed circuit board.

The brush holder of the electric actuator in the above embodiment is shown to have a structure that is fitted into a comb-shaped protrusion formed on a printed circuit board, but the fitting means of this brush holder is Any suitable means can be used as long as the brush holder is firmly held when fitted onto the printed circuit board and the conductive pattern on the printed circuit board and the brush holder are electrically connected.

As explained in detail above, according to this invention, in an electric actuator equipped with a motor and a drive section using the motor, the motor is positioned on the electric circuit printed circuit board, and the motor is connected to the commutator. Since the brush holder holding the power supply brush is fitted and held in a predetermined position on the printed circuit board and is electrically connected to the conductive pattern on the printed circuit board,
The number of parts to be assembled, the number of assembly man-hours, the number of wiring parts, and the number of wiring man-hours related to the motor power supply brush in an electric actuator can be significantly reduced, and costs can be reduced.

Particularly, according to this invention, work such as soldering or caulking is not required when assembling the power supply brush to the motor, so that the power supply brush can be automatically assembled.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of an electric actuator according to an embodiment of this invention, Fig. 2 is a front view of the main parts, Fig. 3 is a side view of the main parts, and Fig. 4 is a brush holder mounting part according to this invention. 5A and 5B are perspective views of brush holders showing other embodiments of this invention. 1... Printed circuit board, 1a, 1b... Protrusion,
2... Conductive pattern for power supply, 3... Motor, 5...
... Rotor, 6 ... Commutator, 7 ... Rotating shaft, 12 ... Motor brush, 13 ... Brush holder, 13a, 13b ... Elastic clamping piece.

Claims (1)

[Scope of utility model registration request] In an electric actuator including a motor 3 and a drive section by the motor 3, the motor 3
is positioned on the printed circuit board 1 for the motor drive circuit, and a brush holder 13 made of a conductive material holding the brush 12 for feeding power to the commutator 6 of the motor 3 is fitted and held at a predetermined position on the printed circuit board 1. An electric actuator characterized in that it is electrically connected to a conductive pattern 2 on a printed circuit board 1.