JPH0143286Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention is a motor actuator using an absolute value encoder in the output gear part for controlling the stop position of the output lever for the air control door in a vehicle air conditioner. It concerns Yueta.

"Prior Art" In general, a vehicle air conditioner includes an inside/outside air switching door that switches between inside air and outside air in a duct, and an air mixing door that adjusts the mixing ratio of cold air from a cooler and warm air from a heater. The vehicle has various control doors such as a defrost door that adjust the amount of air blown into the interior of the vehicle, and the motor actuator that controls these air control doors includes, for example, those shown in FIGS. 9 and 10. be. That is, one brush 50 of the two sets of brushes 50 and 51 provided on the lower surface of the output gear 71 is
It has a limit switch function that turns off the electric circuit to the motor to prevent it from rotating further at both ends of the rotation angle range of the motor, and it comes into contact with the limit switch pattern 76, and the other brush 5
Reference numeral 1 contacts an encoder pattern 75 that constitutes an absolute encoder that slides on a plurality of conductive patterns depending on the rotational position of an output gear and outputs a position signal. The circuit pattern of this absolute encoder is the output gear 71 integrated with the output gear shaft 72.
It consists of a common contact piece 52 and an operating contact piece 53, which are provided on a printed circuit board 73 facing the bottom surface of the board, and which are attached concentrically side by side. First,
Two contact pieces 56 and 57 are provided, the motor 1 is connected between the common contact piece 52 and the first terminal 58, and a connecting part 60 and the first contact are provided, which connect the operating contact piece 53 and the second terminal 59. A first diode 61 is connected between the contact piece 56 and a current flowing in a direction to rotate the motor 1 in the reverse direction, and a current is connected between the second contact piece 57 and the connecting portion 60 in a direction to cause the motor 1 to rotate in the normal direction. A second diode 62 is connected to allow the current to flow. A common conductive plate 65 is arranged concentrically on the opposite side of the common contact piece 52, the actuating contact piece 53, and the first and second contact pieces 56 and 57, and the first, second and third contact pieces are arranged concentrically on the opposite side.
The signal conductive plates 66, 67, and 68 are arranged, and the common conductive plate 65 is connected to a signal power source, for example, 5V, and a pull-down resistor 69 and a buffer amplifier 70 are connected to each signal conductive plate. There is a device in which the formed absolute value type encoder 75 is attached to the output gear portion 71. However, the first
The contact piece 51a is always in contact with the common conductive plate 65, and serves only to simply transmit a signal, and does not serve as a means for generating a signal. The second of the first brush 51,
3 and 4 contact pieces 51b, 51c, 51d, and the first,
A stop signal is generated by the conductive plates 66, 67, and 68 for signals 2 and 3, and the generated signal output is
It's becoming more advanced. Therefore, in a practical motor actuator, the number of contact pieces or conductive plates provided on the brush can be limited to about four in parallel, and the disadvantage is that only 3 bits and 8 positions can be controlled.

Here, encoders can be roughly divided into integration type and absolute value type.The former type calculates the amount of movement by counting pulses after the output gear with brushes returns to the reference home position when a current is input. In contrast, the latter method sets the reference position to 0 and generates a binary code corresponding to the amount of movement. In this case, the former is convenient if the power does not turn off all the time once the power is turned on, but if you want to turn off the electrical circuit by putting the engine key in and out, like in a car, then the key Returning to the home position every time it is inserted wastes time and has the disadvantage of being inefficient.

``Problem that the invention aims to solve'' The brushes for conventional absolute value encoders are integrated, and it is necessary to arrange independent patterns for each brush on the printed circuit board on the case side. It was difficult to increase the number of encoder signals due to the space constraints, but the present invention aims to provide freedom in arrangement by making the brushes independent.

"Means for Solving the Problems" The structure of the present invention to achieve the above purpose is to install a limit switch pattern that prevents rotation beyond a certain angle, and two diodes that regulate the direction of current flow. , a disc-shaped printed circuit board having a pattern for an absolute value encoder is mounted on the lower surface of an output gear that is linked to a motor, and brushes for the limit switch are independently provided opposite to the disc-shaped printed circuit board, The brush for the most significant bit of the absolute value encoder and the brush for the next most significant bit are arranged at a certain angle on the same circumference of the output gear shaft to share a part of the pattern for the absolute value encoder. It is characterized by the fact that it is possible to do so.

"Function" In this way, the encoder brush is independent for each signal, so the brush for the most significant bit and the brush for the next lower bit are used for the encoder pattern. You can freely position the brush so that it can be shared.

“Embodiment” An embodiment of the present invention will be described with reference to the drawings. A motor gear 2 and a large-diameter output gear 4 of a motor 1 are interlocked via an intermediate gear 3 consisting of a plurality of gear groups forming a reduction gear. An output arm 6 is attached to one end of an output shaft 5 that is attached to an output gear. Reference numeral 7 denotes a case for accommodating a motor actuator, in which the motor 1, intermediate gear 3, and output gear 4 are housed, respectively. The output shaft 5 is rotatably supported on the case 7, and a plurality of recesses 8, 8 are provided on the lower surface of the output gear 4, and a disk-shaped printed circuit board 9 is placed in contact with the lower surface of the output gear 4. Touch and stick. On one side of the lower surface of the printed circuit board 9, convex portions 11 and concave portions 12 are arranged concentrically from the center of the hole 10 through which the output shaft 5 is inserted and alternately provided at regular intervals. An absolute value encoder pattern 15 formed on the bottom side of the printed circuit board 9 is provided, and a limit switch pattern 15 is provided on the other side of the lower surface of the printed circuit board 9 to set the rotating range of the output gear, that is, the operating range. 20 are provided. A support board 17 on the case side is attached below this printed circuit board 9, and in order to configure a limit switch mechanism between the upper surface of this support board 17 and the pattern 15 for the absolute value type encoder, a 0-bit brush 21, A brush 22 for the first bit, a brush 23 for the second bit, and a common brush 25 for the encoder pattern are arranged concentrically and in multiple layers on the same radius edge, and a brush for the third bit, which is the highest signal brush, is arranged concentrically and in multiple layers on the same radius edge. 24 is arranged on the same circumference as the second bit brush 23, which is the second from the top, and shifted in the circumferential direction so that the phase is shifted, and the 0 to 3 bit brushes and the common brush are made to be independent from each other. The signal lines 21a, 22a, 23 are arranged and mounted on the support substrate 17, respectively.
a, 24a. Further, the limit switch pattern 20 for determining the rotation angle range of the output gear 4, that is, the operation setting range, includes a common pattern 31 and first and second contact pieces 34 and 35 through slits 32 and 33 at both ends, respectively. , and the common pattern 31 and the first and second contact pieces 34 and 35 are connected by first and second diodes 36 and 37, respectively. This diode is mounted on a printed circuit board 9 and housed in the recess 8. In the figure, 26
Common brush for limit switch, 27a, 27
b is a positioning brush.

Although this embodiment has been described using 4 bits, it is also possible to use a larger number of bits.

Next, the operation of this embodiment will be explained. When the motor 1 is driven, the output gear 4 is rotated through the intermediate gear 3, and the disk-shaped printed circuit board 9 attached to the lower surface of the output gear 4 is rotated as shown in FIG. The output gear 4, which rotates in either the Y direction and has a limit switch pattern 20 and an encoder pattern 15 that regulate the rotation range of the output gear attached to the lower surface of the disc-shaped printed circuit board, rotates. The point of contact with each brush mounted on the support substrate 17 changes.

FIG. 5 shows brushes 2 for second and third bits other than brush 21 for 0 bit and brush 22 for first bit.
3, 24 and the common brush 25 are in contact with the four encoder patterns 15, respectively, and the limit switch common brush 26 and the positioning brushes 26, 2
7a and 27b are in contact with the common pattern 20, so when the motor 1 is driven in this state, the printed circuit board 9 integrated with the output gear 4 can rotate in either the X direction or the Y direction.

Next, when the output gear 4 rotates counterclockwise (Y direction) together with the printed circuit board 9 and the brushes 21, 23, 22, and 24 for 0 to 3 bits are all removed from the encoder pattern 15, the limit switch pattern 20 is removed. The common brush 26 is in contact with the common pattern 31, but the first positioning brush 27a
is in contact with the second contact piece 35, so the current input from the terminal 26a is cut off by the second diode 37, and the output gear 4 does not rotate further counterclockwise from the state shown in FIG. In this state, terminal 2
If current is input from the 7c side, the second diode 3
A current flows through 7 to drive the motor 1 and rotate the output gear 4 clockwise (X direction).

When the output gear 4 continues to rotate clockwise (X direction) and the 0 to 2 bit brushes 21, 22, 23 other than the third bit brush 24 come off the encoder pattern 15 (FIG. 7), The common brush 26 for determining the stop position is in contact with the common pattern 31, and is in contact with the first contact piece 34 by the second positioning brush 27a, and the current input from the terminal 27c side passes through the first diode 36. Then, the flow goes to the common pattern 31, and the motor 1 stops rotating in the X direction, but rotates in the anti-X direction.

Note that the tips of the positioning brushes 27a and 27b are divided into two parts: a common pattern 31 and a first and second part.
When the second positioning brush 27b reaches the gap between the contact pieces 32 and 33, the first positioning brush 27b has already reached the gap between the contact pieces 32 and 33.
7a is positioned on the first and second contact pieces 32 and 33, so that a situation in which the positioning brushes 27a and 27b do not come into contact with either the common pattern 31 or the first and second contact pieces 32 and 33 does not occur. It is for the purpose of

``Effect of the invention'' In the present invention as described above, the encoder brush is independent for each signal, so for the absolute value encoder pattern, the topmost bit brush and the next lower brush are the encoder brushes. Since the pattern can be shared, the pattern can be made smaller. Further, since the brushes are independent, there is a degree of freedom in arrangement, which has the advantage of making it easier to design the encoder. Furthermore, as described above, the bit brushes are independent and have a degree of freedom in arrangement, and a part of the circuit pattern can be shared, making it easy to increase the number of signals (number of bits) of the encoder.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a perspective view of the whole with the housing omitted, Fig. 2 is a cross-sectional view of the main parts of the whole, Fig. 3 is a bottom view of the printed circuit board, and Fig. 4 is a cross-sectional view of the main part of the whole. FIG. 3 is a sectional view taken along the line A-A, and FIGS. 5 to 7 are explanatory diagrams showing the operating state of a switch mechanism consisting of a printed circuit board pattern and a brush,
FIG. 8 is an explanatory diagram showing the output signal of the encoder,
Figure 9 shows a conventional actuator.
FIG. 10 is a perspective view of the entire device with the housing omitted, and a plan view showing a conventional circuit pattern. 1... Motor, 4... Output gear, 9... Printed circuit board, 15... Encoder pattern, 20...
...Pattern for limit switch, 21-26,2
7a, 27b... brush, 36, 37... diode.

Claims (1)

[Scope of utility model registration request] A disk-shaped printed circuit board with a limit switch pattern that prevents rotation beyond a certain angle, two diodes that regulate the direction of current flow, and an absolute value encoder pattern is attached to the bottom surface of the output gear that is linked to the motor. Attach each to
Brushes for the limit switches are provided independently facing the disc-shaped printed circuit board, and the brush for the most significant bit of the absolute value encoder and the brush for the next most significant bit are placed on the same circumference of the output gear shaft. A motor actuator characterized in that the absolute value encoder patterns are arranged at a certain angle so that a part of the pattern for the absolute value type encoder can be shared.