JP2977388B2 - Motor actuator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor actuator used for controlling a position of a driven body connected to an output shaft.

[0002]

2. Description of the Related Art A motor actuator of this type includes:
In general, a conductive brush that rotates together with an output shaft that is rotationally driven by a motor, and a conductive pattern that is formed on a wiring board so that the conductive brush contacts while rotating, are provided. In order to control, the rotation and stop of the motor are controlled based on the positional relationship between the conductive brush and the conductive pattern.

A wiring board used for such a motor actuator has conventionally been formed by a printed circuit board.

[0004]

In order to accurately control the stop angle position of the output shaft, it is necessary that the contact position between the conductive brush and the conductive pattern does not change. Therefore, a bearing hole is formed in the wiring board on which the conductive pattern is formed, in which the output shaft on which the conductive brush is mounted is fitted, and if the output shaft is fitted in the bearing hole, contact between the conductive brush and the conductive pattern is achieved. The positional relationship can be made considerably correct.

However, when the wiring board is formed by a printed board, the bearing holes formed by press working and the conductive patterns formed by etching or printing are formed in completely different manufacturing steps.

As a result, the positional relationship between the bearing hole and the conductive pattern is inevitably fluctuated or deviated, and the positional relationship between the conductive brush and the conductive pattern is disturbed.
In some cases, the position of the driven body cannot be accurately controlled.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a motor actuator capable of accurately controlling a stop angle position of an output shaft without causing a deviation in a contact positional relationship between a conductive brush and a conductive pattern.

[0008]

In order to achieve the above object, a motor actuator according to the present invention comprises: an output shaft that is driven to rotate by a motor; a conductive brush that rotates together with the output shaft; A wiring board on which a conductive pattern that contacts while moving is provided, and in order to control a stop angle position of the output shaft, rotation and stop of the motor are determined based on a contact positional relationship between the conductive brush and the conductive pattern. In the motor actuator, the wiring board is formed by an electrically insulating plastic plate body integrally molded with a bearing hole to be fitted with the output shaft while inserting the conductive pattern. I do.

[0009]

The output shaft fits into a bearing hole formed in the wiring board and rotates. Since the bearing hole and the conductive pattern are molded integrally with the wiring board, the bearing hole and the conductive pattern can be manufactured within a very small displacement range.

Therefore, it is possible to minimize the variation and deviation occurring in the contact position relationship between the conductive brush and the conductive pattern which rotates together with the output shaft.

[0011]

An embodiment will be described with reference to the drawings. FIG. 1 shows a first embodiment of the present invention, in which a motor actuator is shown in an exploded three-dimensional manner.

In the drawing, reference numerals 1 and 2 denote upper and lower plastic housings formed by injection molding, and the two housings 1 and 2 are fixed to each other by passing fixing screws (not shown) through screw holes 3 and 4. Is done.

Reference numeral 5 denotes a motor mounting plate fixed to the motor 7 by mounting screws 6, and its feet are inserted into slits 8 formed in the floor of the lower housing 2 and fixed to the lower housing 2.

A worm gear 9 is provided on a rotating shaft 7a of the motor 7.
Is attached, and the receiving plate 11 inserted into the lower housing 2 is applied to the tip of the worm gear 9. 12
Is a group of reduction gears for transmitting the rotation of the motor 7 at a reduced speed, and is rotatably fitted to a shaft 13 erected from the lower housing 2.

An output shaft 15 is formed integrally with the output gear 14 meshing with the last gear of the reduction gear group 12. When the motor 7 rotates, the output shaft 1 is connected via the reduction gear group 12.
5 is driven to rotate.

The protruding end of the output shaft 15 projects outside through a hole 16 formed in the upper housing 1 and is connected to a link (not shown) for moving a driven body such as a vehicle air-conditioning door.

A conductive brush 17 is provided on the lower surface of the output gear 14.
Is fixed, and the conductive brush 17 rotates together with the output shaft 15 around the output shaft 15. Reference numeral 20 denotes a wiring board on which a control circuit for controlling the operation of the motor 7 is wired. On the upper surface of the wiring board 20, a conductive pattern 22 made of a highly conductive metal plate is formed concentrically so as to be in contact with the rotating conductive brush 17. 23 is a diode connected in the control circuit. The shape of the conductive pattern 22 is schematically illustrated in FIG.

At the center of the conductive pattern 22,
A bearing hole 25 into which the lower end of the output shaft 15 is rotatably fitted is formed in the wiring board 20, and the conductive brush 17 rotates around the bearing hole 25.

The wiring board 20 is a plate-like body molded from an electrically insulating plastic material, and when the molding is performed, the conductive pattern 22 is inserted and molded integrally with the wiring board 20. Bearing hole 25
Are simultaneously formed by the molding.

Therefore, the conductive pattern 22 and the bearing hole 2
5 is formed integrally when the wiring board 20 is molded, so that the conductive pattern 22 and the bearing hole 25 can be manufactured within a very small displacement range.

As a result, the output shaft 1 fitted in the bearing hole 25
The variation and deviation occurring in the contact position relationship between the conductive brush 17 and the conductive pattern 22 that rotates together with the motor 5 is very small, and the rotation and stop of the motor 7 are controlled based on the contact relationship between the conductive brush 17 and the conductive pattern 22. Thus, the stop angle position of the output shaft 15 can be accurately controlled.

The conductive pattern 22 has a connection terminal 26 for connecting to an external control circuit and a power terminal 7 of the motor 7.
and a power supply terminal 27 for connection to a. The power supply terminal 27 is bent after molding.

The connection terminals 26 are disposed in a connector 28 formed integrally with the wiring board 20 by plastic molding.
With such a configuration, in order to control the rotation stop position of the output shaft 15, the rotation and stop of the motor 7 are controlled based on the contact relationship between the conductive brush 17 and the conductive pattern 22. In addition,
As the control circuit connected to the connector 28, a known circuit can be used, and the illustration and description thereof are omitted.

The wiring board 20 and the connector 28 thus integrally formed can be freely replaced in accordance with the specification of an automobile air conditioner using a motor actuator. Therefore, the shape of the conductive pattern 22 varies depending on the type of the wiring board 20, and the conductive brush 17 may be changed correspondingly.

The number of connection terminals 26 in the connector 28 is various, such as two if the number is small and ten if the number is large, corresponding to the control circuit formed on the wiring board 20. Have different shapes and sizes.

The connector 28 is disposed so as to protrude outward from the housings 1 and 2. Therefore, the upper and lower housings 1 are provided with connector through holes 29 through which the connectors 28 pass.
Are formed.

However, the connector through hole 29 is formed in a size that allows the largest connector 28 used in the motor actuator of this embodiment to pass through. Therefore, no matter which wiring board 20 and connector 28 are used, since the connector 28 passes through the connector through hole 29,
There is no need to replace the housings 1,2.

However, in most cases, the size of the connector through-hole 29 is too large as compared with the connector 28, so that a gap is formed between the connector 28 and the connector through-hole 29.

The rear end of the connector 28 is provided with a plate-like lid 3 for closing a gap between the connector 28 and the connector through hole 29.
0 is integrally formed with the connector 28 and the like so as to protrude to the side. The outer periphery of the lid 30 is disposed in close contact with the inner surfaces of the housings 1 and 2, and the gap between the connector 28 and the connector through hole 29 is completely closed.

FIG. 2 shows a second embodiment of the present invention, in which a connector 28 is formed on the upper surface side of the upper case 1 and connection terminals 26 are bent upward after molding and positioned in the connector 28. It was made.

Therefore, in this embodiment, the wiring board 20 is formed separately from the connector 28, and if the shape of the connector 28 changes, the upper housing 1 needs to be changed. Also, a step 2 formed on the upper end edge of the lower housing 2
The wiring board 3 is mounted on the portion a, and the motor 7 and the reduction gear group 12 are arranged below the wiring board 20.

As shown in FIG. 3, a shaft 13 for supporting the reduction gear group 12 is erected integrally with the lower housing 2, and the upper end thereof is engaged with a receiver 33 formed on the lower surface of the wiring board 20. I agree.

The other parts are basically the same as those of the first embodiment described above.
Therefore, the same reference numerals are given to the same parts, and the description is omitted.

[0034]

According to the motor actuator of the present invention, since the bearing hole and the conductive pattern are molded integrally with the wiring board, the bearing hole and the conductive pattern can be manufactured within a very small displacement range. Therefore, variations and deviations occurring in the contact position relationship between the conductive brush and the conductive pattern are extremely small, and an excellent effect that the stop angle position of the output shaft can be accurately controlled is obtained.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a motor actuator according to a first embodiment.

FIG. 2 is an exploded perspective view of a motor actuator according to a second embodiment.

FIG. 3 is a partial sectional view of a motor actuator according to a second embodiment.

[Explanation of symbols]

 7 Motor 15 Output shaft 17 Conductive brush 20 Wiring board 22 Conductive pattern 25 Bearing hole

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields investigated (Int. Cl. ⁶ , DB name) H02K 23/00 H02K 11/00 H02K 23/66 H02P 1/22 H02P 3/08

Claims (1)

(57) [Claims] An output shaft rotatably driven by a motor;
A conductive brush that rotates together with the output shaft; and a wiring board on which a conductive pattern that the conductive brush contacts while rotating is formed. The conductive brush is used to control a stop angle position of the output shaft. A motor actuator configured to control rotation and stop of the motor based on a contact positional relationship between the motor and the conductive pattern, wherein a bearing hole to be fitted to the output shaft is formed by molding.
On the insulating plastic plate, the conductive pattern,
Wiring for power supply of the above motor and its connection terminals and external circuit
Insert the wiring connected to the road and its connection terminals
To form the wiring board, and to apply electric wiring other than the conductive brush.
A motor actuator , wherein all of the above are provided on the wiring board .