JPH029473Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a switch that controls a rotation angle, and is used, for example, in a motor actuator that moves the door of an automobile air conditioner.

(Prior Art) Conventionally, as shown in, for example, Japanese Utility Model Application Publication No. 57-146765, movable contacts are provided on a rotating body, and fixed contacts are formed on a substrate corresponding to the stopping position of the rotating body. Slide the movable contact onto this fixed contact,
It is known that when the movable contact separates from the fixed contact, the power to the motor is cut off to control the rotation angle to be output.

(Problem to be solved by the invention) However, in the past, when the movable contact was separated from the fixed contact, the movable contact was configured to come into contact with the board. The contact part of the board wears out and generates wear powder, and when the movable contact returns to the fixed contact, this wear powder is also carried away and deposited on the fixed contact, and the accumulated wear powder causes the movable contact and the fixed contact to There was a problem that poor contact occurred between the two, resulting in a lack of durability and reliability.

Therefore, the object of this invention is to provide a rotation angle control switch that can prevent the generation of the abrasion powder and improve durability and reliability.

(Means for Solving the Problems) The gist of this invention is to provide a rotation angle control switch in which a movable contact provided on a rotating body slides on a fixed contact formed on a substrate. A plurality of sacrificial patterns are formed at the ends of the fixed contacts of the substrate with gaps sufficient for the movable contacts to cross over, and discharge holes are formed on the sliding locus of the movable contacts of the sacrificial patterns.

(Function) Therefore, when the movable contact separates from the fixed contact, it rides on the discarded pattern without contacting the board, which prevents abrasion powder from being generated on the board, thus achieving the above-mentioned problem. It is something that can be done.

(Example) Hereinafter, an example of this invention will be described with reference to the drawings.

2 and 3, in the motor actuator provided with the rotation angle control switch according to this invention, a motor case 2 housing a motor 1 is connected to a cover body 3.
The lid body 3 is fixed to the bottom plate 4, and the gear storage chamber 5 is constituted by the lid body 3 and the bottom plate 4. This gear storage room 5
A worm gear 6 fixed to the rotating shaft 1a of the motor 1 projects therefrom, and this worm gear 6 meshes with an output gear 8 via intermediate gears 7a to 7c. An output shaft 9 is provided on the upper surface of the output gear 8, and this output shaft 9 protrudes from the lid 3, and the output shaft 9 is connected to, for example, a door of an automobile air conditioner via a link. ing. Further, a substrate 10 is arranged below the output gear 8, and a rotation angle control switch described below is provided between the output gear 8 and the substrate 10.

In FIG. 4, the rotation angle control switch 11 is
Movable contacts 12a to 1 fixed to the output gear 3
2f, and fixed contacts 13a to 13e patterned on the substrate 10. Movable contact 12a~
12f are electrically connected to each other and are arranged at a predetermined interval in the radial direction from the center of the output gear. Further, the fixed contacts 13a to 13e are arranged concentrically around the insertion hole 23 of the board into which the support shaft of the output gear is inserted, and the innermost fixed contact 1
3a is circular and serves as a common contact on which the movable contacts 12a and 12b slide, and is connected to one end of the motor 1, and the other end of the motor 1 is connected to the electrode 14 of the connector part.
connected to a. Other fixed contacts 13b to 13
e has an arc shape, and each electrode 14 of the connector part
b to 14e, and a movable contact 12 is connected to fixed contacts 13b and 13c arranged in the middle.
c, 12d are the outermost fixed contacts 1
Movable contacts 12e and 12f slide on 3d and 13e, respectively. 1 of these fixed contacts 13b to 13e
When the corresponding movable contacts 12c to 12f separate from each other, the conduction between the movable contact and the fixed contact is interrupted, but the arrangement of the other fixed contacts and movable contacts is such that they maintain conduction. It is determined.

At the ends of the fixed contacts 13b to 13e, a first
As shown in the figure, two discarded patterns 15 are formed. The sacrificial pattern 15 is electrically non-conductive with a gap 16 between it and the fixed contacts 13b to 13e or other sacrificial patterns 15 such that the movable contacts 12c to 12f can overcome it. In addition, a discharge hole 17 is formed in the discard pattern 15 on the front side in the rotational direction of the movable contacts 12c to 12f on the sliding locus of the movable contacts 12c to 12f, and this discharge hole 17 is used when plating the discard pattern. It is formed as a through hole. still,
The other sacrificial pattern 15 is formed integrally with the fixed contacts 13a to 13c arranged inside, so that wiring during plating can be omitted.

In the above configuration, the electrode 14a and the electrode 14b~
14e, the motor 1 is energized via the rotation angle control switch 11, the motor 1 rotates, and the gears 6, 7a
The output shaft 9 rotates while being decelerated through the shafts 7c and 8. From the fixed contacts 13b to 13e to which the energized electrodes 14b to 14e are connected, to the movable contacts 12b to 13e.
When one of the 12f leaves, the power to the motor 1 is cut off and the motor 1 stops, which causes the output shaft 9
can also be stopped to obtain the desired rotation angle. In this case, as shown in FIG. 1, the movable contacts 12b to 12f cross over the first gap 16, ride on the first discarded pattern 15, and stop. At this time, the movable contacts 12b to 13e are connected to the fixed contacts 13b to 13e.
12f slides and metal powder is generated from the fixed contacts 13b to 13e or the movable contacts 12b to 12f, but this metal powder is discharged through the gap 16 or the discharge hole 17 to prevent the stopping accuracy from deteriorating.

However, when such sliding is repeated, since the width of the gap 16 is narrow, the fixed contacts 13b to 13e and the adjacent disposable pattern 15 become electrically conductive due to the metal powder accumulated in the gap. (Durability test results indicate that it lasts approximately 200,000 times).

However, even if it becomes conductive in this way, the next discarded pattern 16 and the fixed contacts 13b to 1
3e, since a non-conducting state is ensured by the next gap 17, the movable contacts 12b to 12f are separated from the first discarded pattern 16 and are connected to the next discarded pattern 1.
6, the power supply to the motor 1 can be cut off, and the power supply to the motor 1 can be continuously controlled even if the stopping accuracy is degraded.

In FIG. 5, another embodiment of this invention is shown. In this embodiment, the motor actuator is for forward and reverse rotation, and the rotation angle control switch 11 constitutes a stopper circuit, and the motor actuator is for forward and reverse rotation. A potentiometer 18 is placed on one side and a potentiometer 18 on the other side. This potentiometer 18 includes a conductor 19 and a resistor 20 formed on the substrate 10,
Movable contacts 21a, 21 fixed to the output gear
It is composed of b. Then, forward and reverse currents are passed through the motor 1 from the electrodes 14a and 14b via the rotation angle control switch 11 and the diodes 22a and 22b, and when the current is cut off, the rotation angle of the output gear is determined. The stop position at that time is detected by the potentiometer 18 and output as a voltage value from the electrodes 14f and 14g. The other functions and effects are the same as those of the previous embodiment, and the same parts are given the same numbers in the drawings and their explanations will be omitted.

In the above two embodiments, two discarded patterns are provided, but it goes without saying that more patterns may be provided, and the movable contacts may be provided not only on the output gear but also on the rotating body. It is enough.

(Effects of the invention) As described above, according to this invention, a sacrificial pattern is provided at the end of the fixed contact so that the movable contact rides on the sacrificial pattern without contacting the board. Generation of wear particles can be prevented. In addition, a gap is provided between the fixed contact and the sacrificial pattern, and a discharge hole is formed on the sliding trajectory of the movable contact of the sacrificial pattern, so that the movable contact slides the fixed contact from the gap and the discharge hole. The metal powder generated can be discharged.
Furthermore, since there are multiple disposable patterns, it is possible to control the energization of the motor even if the disposable patterns and the fixed contacts become electrically connected after long-term use. This can improve reliability.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing the main parts of this invention, Fig. 2 is a plan view of a motor actuator having a rotation angle control switch of this invention, and Fig. 3 is A of Fig. 2.
- A sectional view, FIG. 4 is a wiring diagram of the board used in the above, and FIG. 5 is a wiring diagram of a board in another embodiment. 12a to 12f...movable contacts, 13a to 13e
...Fixed contact, 15...Discard pattern, 16...
Gap, 17...Drain hole.

Claims (1)

[Scope of utility model registration request] In a rotation angle control switch in which a movable contact provided on a rotating body slides over a fixed contact formed on a substrate, a discard pattern is formed at the end of the fixed contact on the substrate with a gap such that the movable contact can cross over. A rotation angle control switch characterized in that a plurality of movable contacts are formed and a discharge hole is formed on the sliding locus of the movable contact of the discarded pattern.