JPH0450171Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to an electric actuator, and more specifically, the rotational position of the output shaft of a motor actuator for opening and closing a damper in an automobile air conditioner (hereinafter abbreviated as air conditioner). is detected, the motor is stopped at a set position selected by a switch operation, and the damper is stopped at the selected position.

BACKGROUND ART Conventionally, as shown in FIG. 1A, this type of automotive air conditioner has a damper 1 for switching between inside and outside air (R/F) and a damper 2 for mixing cold air and warm air (A/M).
For example, a structure shown in FIG. 1B is provided as a motor actuator that opens and closes the damper 3 for air outlet switching (MODE), respectively.
The motor actuator controls the rotation of a motor 32 housed in a case 30 and a lid 31 by a worm 3.
3, gear 34, and output shaft gear 7 to the output shaft 6, and the dampers 1, 2, or 3 are opened and closed in accordance with the rotation of the output shaft 6. Further, as shown in FIG. 2, brushes 8 and 9 constituting a position detection mechanism on the output shaft gear 7
At the same time, a board 39 provided with a pattern 5 is placed at a position in contact with the brushes 8 and 9, and the pattern 5 is connected to a selection switch (DEF, HEAT, B/ L,
The configuration is such that it is connected to each VENT switch. The brushes 8 and 9 are rotated in conjunction with the rotation of the output shaft 6.
slides on pattern 5, and when it reaches the edge of the pattern connected to the above-mentioned ON switch, the power is cut off, the motor stops, and the damper stops at the predetermined position set by the switch operation.

In the conventional position detection device described above, the relationship between the pattern and the brush is for switching the air outlet (for MODE).
Now, as shown in Fig. 5, switch the outlet selection switch 4 (4a for VENT, 4b for B/L, 4 for HEAT)
Switching patterns 5a, 5b, 5c, 5d, and 5e are formed concentrically on the printed circuit board to be connected to the switching patterns 5c, 4d for H/D, and 4e for DEF, respectively. On the other hand, as shown in FIG. 2, a pair of brushes 8 and 9 are attached to one end surface of the gear 7 fixed to the output shaft 6 symmetrically with respect to the output shaft 6.
Each of the 9 sliding terminals 8a to 8e, 9a to 9e slides on the switching patterns 5a to 5e.

In the position detection device configured as described above, the stopping accuracy of the actuator is greatly influenced by the accuracy of the edge position of each pattern. For example, if the edge of each switching pattern deviates from the target value by l, the angle error θ will occur by θ=tan ⁻¹ l/R, where R is the radius of the pattern. That is, as the radius R of the pattern becomes smaller, the angular error θ increases.
Therefore, the switching pattern is 5a→5b→5c→5
The stopping accuracy of the actuator deteriorates as it moves inward toward points d and 5e, which is a major drawback for this type of actuator position detection device that requires high stopping accuracy.

Purpose of the invention The present invention aims to solve the above-mentioned conventional problems.The edges of each switching pattern arranged concentrically are laid out at the same track position as the outermost pattern edge, and the edge portion The pattern radius is maximized to prevent deterioration in stopping accuracy.

Structure of the Invention In order to achieve the above-mentioned object, the present invention connects an actuated member to an output shaft rotated by a motor via a speed reduction mechanism, rotates the actuated member, and fixes the actuated member to the output shaft. A pair of brushes are attached symmetrically about the output shaft to the gear, and a plurality of sliding terminals are provided in a comb shape at regular intervals on each of these brushes, and each sliding terminal of the pair of brushes comes into sliding contact. In an actuator, a substrate having a concentric pattern is arranged at a position, and when the sliding terminal of the brush reaches the edge of the pattern, the current is cut off to stop the motor and the actuated member is stopped at a predetermined position. Among the patterns arranged concentrically above, except for the common terminal pattern arranged on the innermost circumference, all the other switching patterns are shaped concentrically and one end of the arc is bent radially outward. and position the outer end position of each bent part on the same track as the outer end position of the bent part of the outermost pattern,
The edge for stopping the motor provided at the end of the bent part of each of these patterns is set so that it comes into contact with the sliding terminal at the outermost position of the brush, and when the sliding terminal reaches the edge of the switching pattern at the outermost position, Another object of the present invention is to provide an actuator for an automobile characterized in that the motor is stopped when the sliding terminal of the brush comes off the edge.

The actuator described above is used as a damper opening/closing device for an automobile air conditioner, and each of the switching patterns described above is connected to a switch that selects the damper opening/closing position, and when the sliding terminal of the brush reaches the edge of the switching pattern connected to the switch that is turned on, When the motor is stopped by cutting off the current, and the damper, which is opened and closed by the motor via the output shaft, is stopped at a predetermined position selected by the above switch, the edge of each switching pattern is set at the outermost periphery with a large radius. Because it is placed in the right position, there is little angle error of the edge.
The stopping accuracy of the damper has been greatly improved and can meet the demand for high stopping accuracy.

Embodiments The present invention will be explained in detail below with reference to embodiments shown in FIGS. 3 and 4.

In the first embodiment shown in FIG. 3, arc-shaped switching patterns 11, 1
2, 13, 14, and 15 are formed in a concentric arc shape with the fulcrum "O" as the center, and a bending part is provided that is bent outward in the radial direction from one end of the arc part to interchange the inner and outer peripheries. , each switching pattern 11-1
5 edges 11a and 11b, 12a, 13a, 1
4a and 15a are located on the same track at the outermost periphery where they come into contact with the sliding terminals 8a and 9a at the outermost periphery positions of the brushes 8 and 9 shown in FIG. That is, the switching pattern 11 is as shown in FIG.
Similarly, the switching pattern 12 is connected to the H/D switch 4d, the switching pattern 13 is connected to the B/L switch 4b, the switching pattern 14 is connected to the VENT switch 4a, and switching pattern 1 is connected to the HEAT switch 4c.
5 are respectively connected to the DEF switch 4e. Furthermore, common terminal patterns 16A and 16B are formed inside the switching patterns 14 and 15 on the innermost periphery. The common terminals 16A and 16B each have a substantially semicircular arc shape, and are arranged in an arc shape facing each other with the X-ray passing through the fulcrum "O" interposed therebetween. Motor connection portions 16A-1 and 16B-1 protrude from both adjacent ends of these common terminal patterns 16A and 16B, and are connected to the motor 20.

Among the switching patterns 11 to 15 above, HEAT
The switching pattern 11 connected to the switch 4c has a shape as shown in the figure, and is arranged on the left side in the figure from the Y line passing through the fulcrum "O" and orthogonal to the above X-line, with its both end edges 11a and 11b slightly away from the Y line. When the pair of brushes 8 and 9 shown in FIG. 2 are located on the Y line, any of the sliding terminals 8a to 8
e, 9a to 9e are also edges 11 of switching pattern 11.
The position is set to be away from a and 11b. As shown in the figure, the switching pattern 12 has one tip protruding in the circumferential direction from the edge 11b of the switching pattern 11, and extends radially outward from the end of this protruding concentric part to a position on the same track as the edge 11b. A cam portion 12b is formed which is bent in the opposite direction, and the tip of the outer circumferential position of the cam portion 12b serves as a motor stopping edge 12a of the switching pattern 12. Similarly, the switching pattern 13 has one end protruding from the edge 11a of the switching pattern 11, and a cam portion 13b that protrudes at the same circumferential position as the edge 11a is formed in the protruding portion, and the outer circumferential position of the cam portion 13b is The tip is a stopping edge 13a. Moreover, the switching patterns 14 and 15, which are formed on the circumference from the switching patterns 12 and 13, are arranged symmetrically with respect to the X-ray, and the switching patterns 11 and 15 are arranged at the tip of each of the switching patterns 14 and 15.
Cam portions 14b, 15b are formed that protrude to the same circumferential position as the edges 11a, 11b, and the ends of the outer peripheral positions of these cam portions 14b, 15b are used as stopping edges 14a, 15a.

In this way, each edge 11a, 11b, 12a, 13a, 14 of the switching patterns 11 to 15
a and 15a are both set to be located at the outermost circumferential position.

Since the brush 8 sliding on the switching pattern described above does not come into sliding contact with any of the switching patterns at a position away from the edge 14a of the switching pattern 14, the current is cut off and the rotation of the brush 8 is stopped. 9 is the edge 15a of the switching pattern 15
When the brush 9 is further away from the brush 9, the current is cut off and the rotation of the brush 9 is stopped, and the range A in the figure becomes a non-moving part of the brush. The sliding terminal 8a on the outermost periphery of the brush 8 is located near the edge 11a of the switching pattern 11 and the cam portions 13b, 14b of the switching patterns 13, 14 (edge portion 1).
3a, 14a) Slide onto the top. On the other hand, the outermost sliding end 9a of the brush 9 slides on the vicinity of the edge 11b of the switching pattern 11 and on the cam portions 12b, 15b (edges 12a, 15a) of the switching patterns 12, 15. Furthermore, the sliding terminal 8b mainly slides on the switching pattern 11, 8c on 13, and 8d on 14, the sliding terminal 9b mainly slides on switching pattern 11, 9c on 12, and 9d on 15. slide.
In addition, the innermost sliding terminal 8e is the common terminal 16A.
Similarly, on the top, the sliding terminal 9e is the common terminal 16B.
The top is set to slide into contact.

The above common terminals 16A and 16B and motor 2
0, a resistor R ₁ and a capacitor C ₁ , and a resistor R ₂ and a capacitor C ₂ are installed to prevent chattering, respectively, and the circuits are equipped with resistors R ₃ and R ₄ , respectively. is provided to create resistance during discharge.

In the position detection device having the above configuration, for example, one of the suction port selection switches 4 is
When the switch 4e is turned on, the motor 20 is energized and rotated while any of the sliding terminals 9a to 9d of the brush 9 is in sliding contact with the connected switching pattern 15. At this time, only the sliding terminal 9d comes into sliding contact until it reaches the cam part 15a of the switching pattern 15, but once it reaches the cam part 15a, the sliding terminals 9a to 9
d, only the sliding terminal 9a comes into sliding contact near the edge 15a, and the sliding terminal 9a comes off from the edge 15a, cutting off the electricity and stopping the motor 20. At the same time, the motor 20 is rotated. The output shaft 6 stops and the brushes 9 and 8 also stop. When the other switches 4 are turned on, the same effect occurs, and when the sliding terminals 8a or 9a on the outermost periphery of the brushes 8 and 9 reach the edges of the switching patterns 11 to 15, or at a position away from the edges, the current supply is cut off. The rotation of the motor 20 is stopped, and the rotation of the transmitted damper (not shown) is stopped at the set position.

In this way, all the stopping edges of the switching patterns 11 to 15 are shaped so as to be in contact with the outermost sliding terminal, so the angular error of the edges can be reduced, and the motor can be stopped. Accuracy can be improved.

In addition, the shapes of the switching patterns 11 to 15 are the same as the above-mentioned third
Not limited to the embodiment shown in the figure, as shown in FIG. 4, in order to avoid interference with other patterns, the back pattern 21 provided on the back side of the printed circuit board is connected to the pattern 12'' provided on the front side. The back pattern may be replaced by a jumper wire such as a lead wire, and in any case, the stop edge of the switching pattern may be placed at a position where it comes into contact with the outermost sliding terminal.

Effects of the Invention As is clear from the above explanation, according to the position detection device according to the present invention, the motor stopping edge of each switching pattern arranged in a concentric circle that makes sliding contact with the brush is arranged at the outermost position. , the angular error of the edge can be reduced, and the stopping accuracy can be greatly improved. Therefore, it can be suitably used in a damper opening/closing device for a vehicle air conditioner that requires high stopping accuracy.

[Brief explanation of the drawing]

Fig. 1A is a schematic diagram showing each damper of an automobile air conditioner, Fig. 1B is an exploded perspective view of a conventional actuator, and Fig. 2 is a perspective view showing a brush attached to the output shaft gear of a position detection device. , 3rd
The figures are a pattern and a circuit diagram according to an embodiment of the present invention, FIG. 4 is a drawing showing a pattern of another embodiment of the invention, and FIG. 5 is a drawing showing a conventional pattern. 1, 2, 3...damper, 4, 4a, 4b, 4
c, 4d, 4e...Switch, 8, 9...Brush, 8a-8e, 9a-9e...Sliding terminal, 10
...Printed circuit board, 11, 12, 13, 14, 1
5...Switching pattern, 11a, 11b, 12b,
13b, 14b, 15b...edge, 12a, 1
3a, 14a, 15a...cam part, 16A, 16
B... Common terminal pattern, 20... Motor.

Claims (1)

[Claims for Utility Model Registration] (1) A brush is attached to one side of the gear fixed to the output shaft, and the brush is provided with a plurality of sliding terminals in a comb shape. In an electric actuator, a circuit board having a plurality of concentric patterns is arranged at a position where the brush contacts in sliding contact, and when the sliding terminal of the brush reaches the edge of the pattern or comes off, electricity is cut off and the motor is stopped, Among the concentric patterns mentioned above, except for the common terminal pattern placed on the innermost periphery, the shapes of all other switching patterns are radially outward from the end of the concentric arc part. The motor stopping edges provided at the outer end of each bent part are positioned on the same track on the outermost circumference, and these motor stopping edges are set so as to come into contact with the sliding terminal of the brush. An electric actuator characterized in that the motor is configured to stop when the sliding terminal of the brush reaches or comes off the motor stopping edge of each pattern. (2) In the actuator described in claim (1) for utility model registration, the above switching pattern is connected to a switch that selects the open/close position of a damper of an automobile air conditioner, and is connected to the switch that is turned ON. When the sliding terminal on the outermost periphery of the brush comes off from the edge for stopping the motor, the power is cut off to stop the motor, and the damper, which is opened and closed by the motor via the output shaft, is moved to the predetermined position set by the above switch. An electric actuator characterized by being configured to stop.