JP2510673Y2 - Stop position control device for motor actuators - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor actuator used for multi-step control of stop positions of air blowout mode switching doors, air mix doors, inside / outside air switching doors and other doors of automobile air conditioners. The present invention relates to a stop position control device.

[0002]

2. Description of the Related Art In general, a stop position control device for a motor actuator of this type has at least a first position and a second position at a position different in distance from a rotation center of a rotating part which rotates together with an output shaft which is rotationally driven by a motor. Is provided with a conductive brush having two contact points, and a plurality of conductive contact pieces are arranged on the substrate facing the conductive brush so as not to contact each other. The one contact and the other contact the second contact at the same time at each end so that the motor stops at that position.

Conventionally, as shown in FIG. 5, for example, the conductive contact pieces 81 and 82 are arranged in concentric circles having different radii according to the turning radii of the two contact points 91 and 92 of the conductive brush 90. The lines were alternately arranged in a so-called zigzag pattern (Shokai 62-122459). 80 is a common contact piece,
Reference numeral 93 is a contact that contacts the common contact piece 80.

[0004]

The end portions of the inner and outer conductive contact pieces 81, 82 have regions 81a, 82a which simultaneously contact the conductive brush 90, and two contact points 91, 91 of the conductive brush 90 are provided. A signal can be issued to stop the motor at the position where 92 simultaneously contacts this area. The width of the simultaneous contact regions 81a and 82a is 1 to 2 degrees in terms of the rotation angle of the conductive brush 90.

However, for example, as shown in FIG. 6, the two contact points 91,
If the positional relationship of 92 is deviated, the simultaneous contact areas 81a, 81a,
The width of 82a is narrow on one end side of each conductive contact piece 81, 82,
It becomes wider at the other end. That is, the simultaneous contact regions 81a, 8
Every other 2a becomes narrower and every other 2a becomes wider.

Then, when the conductive brush 90 is in the narrower one of the simultaneous contact areas 81a and 82a, hunting occurs when the motor is stopped, and the conductive brush 90 has the larger one of the simultaneous contact areas 81a and 82a. If the motor is attempted to be stopped at the time, the stop position changes depending on the rotation direction and the stop position accuracy deteriorates.

Therefore, the simultaneous contact areas 81a, 82a
Need to be modified so that the width of
It's not an easy task to fix a condition that every other narrow and every other wide.

In view of this, the present invention makes it possible to easily correct the width of the simultaneous contact area where the conductive brushes simultaneously contact two adjacent conductive contact pieces due to the displacement of the contact points of the conductive brushes. An object of the present invention is to provide a stop position control device for a motor actuator, which is modified so that the motor can always be stably stopped at an accurate position.

[0009]

In order to achieve the above object, a stop position control device for a motor actuator according to the present invention provides a rotating portion which rotates together with an output shaft which is driven to rotate by a motor, from a rotation center thereof. A conductive brush having at least two first and second contact points at different positions, and a plurality of conductive contact pieces are arranged adjacent to each other on the substrate facing the conductive brush so as not to contact each other. Two conductive contacts, one of which is in contact with the first contact and the other of which is in contact with the second contact at the same time at each end,
In a stop position control device for a motor actuator, wherein the motor is stopped at that position, one end of each of the conductive contact pieces is in contact with the first contact, and the other end thereof is the second contact. The intermediate portion is disposed at a position where it contacts at least one of the first and second contact points.

[0010]

The one end of each conductive contact piece is arranged at a position where it comes into contact with the first contact of the conductive brush, and the other end side is the second contact of the conductive brush.
It is arranged at a position where it comes into contact with the contact point of.

Therefore, if the contact points of the conductive brushes are displaced, the widths of the simultaneous contact regions where the conductive brushes simultaneously contact two adjacent conductive contact pieces are all the same, or the widths are the same. Get wider

[0012]

Embodiments will be described with reference to the drawings. Figure 2
FIG. 3 is a plan view of the motor actuator with the cover of the case 1 removed, and 2 is a motor and 3 is a worm gear attached to the rotating shaft of the motor 2.

Reference numeral 4 denotes a reduction gear group for decelerating and transmitting the rotation of the motor 2. The final gear 4a of the reduction gear group serves as an output shaft 5 and projects out of the case 1. An output arm 6 connected to a driven object (such as an automobile air conditioning door) by a link or the like is fixed to the protruding end of the output shaft 5.

A signal for stopping the motor 2 at a predetermined position is provided on the back surface of the final gear 4a that rotates in the same direction as the output shaft 5 and the surface of the printed circuit board 7 facing the final gear 4a in order to control the stop angle of the output shaft 5. A conductive brush for generating and a conductive contact piece are provided.

FIG. 1 shows conductive contact pieces 10 and 11 arranged on the surface of a printed circuit board 7 and a conductive brush 20 attached to the back surface of the final gear 4a. Conductive brush 20
Has first, second, and third contact points 21, 22, and 23 from the outside by changing the distance from the center on the radius of the final gear 4a, and these contact points 21, 22, 23 conduct each other. are doing.

On the other hand, the conductive contacts 10 and 11 are connected to the third contact 2
Common contact piece 1 formed in an arc shape so as to always contact 3
0 (hereinafter, referred to as "common contact piece 10" to distinguish from "conductive contact piece 11"), and first and second contact points 21 and 22.
A plurality of conductive contact pieces 11 arranged so as to alternately contact
There is.

Each of the conductive contact pieces 11 has the same shape, one end of which is in contact with the first contact 21 of the conductive brush 20 and the other end of which is in contact with the second contact 22 of the conductive brush 20, and the middle portion thereof is the first contact 21. The first and second contact points 21 and 22 are arranged regularly so as to come in contact with one or both of them and are obliquely displaced in the radial direction.

The conductive contact pieces 11 are spaced apart from each other so that they are not in contact with each other, and at the end portions, two adjacent conductive contact pieces 11, one of which is a first contact 21,
The other is arranged so as to come into contact with the second contact 22 at the same time. The simultaneous contact area 11a has a rotation angle of the conductive brush 20 of 1 to 2 degrees.

The common contact piece 10 and the plurality of conductive contact pieces 11 arranged in this way are connected to a motor control circuit 30 for controlling the stop and rotation directions of the motor 2. Since the motor control circuit 30 is known from Japanese Utility Model Publication No. 62-122459, detailed description thereof will be omitted, but the first and second contacts 21 and 22 of the conductive brush 20 are simultaneously formed on the adjacent conductive contact pieces 11. The motor 2 can be stopped at each contact position. Thereby, the stop position of the output arm 6 can be arbitrarily stopped at predetermined positions in multiple stages.

In the apparatus of the above-described embodiment having the above-mentioned structure, the first and second contacts 21 and 22 of the conductive brush 20 are provided.
If there is a deviation in the positional relationship, the widths of the simultaneous contact regions 11a are all the same or are the same or are all the same as shown in FIGS. 3 and 4.

Therefore, when the width of the simultaneous contact area 11a is too narrow or too wide, if the set position is shifted so that the width of the simultaneous contact area 11a at one place is correct, then all of the contact areas can be moved. Since the width of the simultaneous contact area 11a is corrected correctly, it can be adjusted very easily.

[0022]

According to the stop position control device for a motor actuator of the present invention, the widths of the simultaneous contact areas where the conductive brushes simultaneously contact two adjacent conductive contact pieces are all the same or the same. As described above, the correction can be made very easily, and as a result, the motor can always be stably stopped at an accurate position, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a schematic plan view of a stop position control device for a motor actuator according to an embodiment.

FIG. 2 is a schematic plan view of the motor actuator of the embodiment.

FIG. 3 is a partially enlarged plan schematic view of the embodiment.

FIG. 4 is a partially enlarged plan schematic view of the embodiment.

FIG. 5 is a schematic plan view of a conventional example.

FIG. 6 is a partially enlarged plan schematic view of a conventional example.

[Explanation of symbols]

 2 Motor 4a Final gear (rotating part) 5 Output shaft 7 Printed circuit board 11 Conductive contact piece 20 Conductive brush 21 First contact point 22 Second contact point

Claims (1)

(57) [Scope of utility model registration request] 1. A conductive brush having at least two first and second contact points is provided at a position having a different distance from a center of rotation of a rotating part which rotates together with an output shaft which is driven to rotate by a motor, and the conductive part is provided. On the substrate facing the brush, a plurality of conductive contact pieces are arranged so as not to contact each other, and two adjacent conductive contact pieces have one of the first contact points and the other of the second contact points. In a stop position control device for a motor actuator in which each end is in contact at the same time and the motor is stopped at that position, each conductive contact piece is formed in the same shape, and one end side is the first
Diagonally with respect to the rotating direction of the conductive brush, so that the other end contacts the second contact and the intermediate part contacts at least one of the first and second contacts. Rank
A stop position control device for a motor actuator, characterized in that the positions are shifted .