JP2003106867A - Pulse generator and motor-driven actuator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pulse generator capable of accurately detecting a rotary angle of an output gear and to provide a motor-driven actuator capable of accurately outputting the rotary angle of the output gear. SOLUTION: The pulse generator 1 is arranged on a circular board 1 and detecting the rotary angle of the circular board 7 to generate a pulse. The pulse generator 1 has a pulse pattern plate having a plurality of irregular pulse patterns 14a and 15a (14b and 15b) and a contact 13a (13b) slid on the plurality of the irregular pulse patterns 14a and 15a (14b and 15b), and a circumferential angle θa of a projection-like pulse pattern out of the plurality of the irregular patterns 14a and 15a (14b and 15b) is formed smaller than a circumferential angle θ of a recess-like pulse pattern out of the irregular pulse patterns 14a and 15a (14b and 15b).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pulse generator and an electric actuator, and more particularly to a pulse generator and an electric actuator suitable for use as a movable member such as an air mix door or a mode switching door of a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, an electric actuator for driving a movable member such as an air mix door or a mode switching door of a vehicle air conditioner has a number of pulses proportional to a rotation angle of an output gear which constitutes a part of a reduction mechanism. By detecting
It is configured to adjust the rotation angle of the output gear.

FIG. 17 is an overall view of a conventional pulse generator, and FIG. 18 is a schematic diagram showing the operation of the conventional pulse generator.

Here, FIG. 18 is a view in which the pulse pattern plate 112 shown in FIG. 17 is cut along a line L2 through which the contact 113a passes, and the cut outer peripheral surface is linearly developed. It shows a case where the pulse pattern plate 112 is rotated so as to move in the direction of arrow A in the figure.

As shown in FIG. 17, a pulse generator 10
Reference numeral 1 denotes an output gear 1 which constitutes a part of a reduction mechanism (not shown).
Pulse pattern plate 112 disposed on the upper surface of 07
And three-pole contacts 113a, 113b, 11 made of a conductive material and slidingly contacting the pulse pattern plate 112.
3c.

The output gear 107 is constructed so as to rotate in both clockwise and counterclockwise directions with the rotary shaft 107a as the rotary shaft. Also, the pulse pattern plate 1
12 is configured to rotate with the rotation of the output gear 107.

The pulse pattern plate 112 is a conductive plate made of a conductive material formed by a well-known photo-etching method or a plating method on a disk-shaped plate body made of an insulating resin material. 114 is provided.

The conductive plate 114 is provided with substantially fan-shaped notches 114d and 114e, and the notches 114 are formed.
In d and 114e, the circumference is equally divided by the number of pulse patterns, and the virtual circumference angle of the pulse pattern is 2θ. Further, the substantially fan-shaped notch 114e is also formed in the same manner, so that the notch 114e is formed on the inner side in the radial direction of the pulse pattern 114a.
A pulse pattern 114b is formed integrally with the pulse pattern 114a and having a phase difference of the virtual circumferential angle θc of the pulse pattern 114a.

Here, as described above, the pulse pattern 11
4a (hereinafter referred to as A-phase convex pulse pattern 114a)
Are formed with a virtual circumferential angle θ. Therefore, on the same circle, the length of the A-phase convex pulse pattern 114 a in the circumferential direction is equal to the notch 114 of the conductive plate 114.
d is formed by a virtual circumferential angle θ equally divided by the number of pulse patterns, and is also formed for each virtual circumferential angle 2θ, so that the upper surface 112a of the pulse pattern plate 112 is exposed. 115a (hereinafter, the A-phase concave pulse pattern 115a) has a length equal to the circumferential direction.

A pulse pattern 114b (hereinafter referred to as a B-phase convex pulse pattern 114b) and an insulating portion 115b (hereinafter referred to as B) on the upper surface 112a of the pulse pattern plate 112.
Similarly, the recessed pulse pattern 115b) has the same length in the circumferential direction.

The contact 113a is arranged so as to be in sliding contact with the A-phase convex pulse pattern 114a and the A-phase concave pulse pattern 115a alternately as the pulse pattern plate 112 rotates.

Similarly, the contacts 113b are arranged so as to be in sliding contact with the B-phase convex pulse patterns 114b and the B-phase concave pulse patterns 115b alternately as the pulse pattern plate 112 rotates.

The contact 113c is arranged so as to be in sliding contact with the annular pulse pattern 114c of the conductive plate 114 at all times during rotation of the pulse pattern plate 112.

In the pulse generator 101, as shown in FIG. 18, the A-phase convex pulse patterns 114a and B are formed.
The biconvex pulse pattern 114b is formed so as to project in the vertical direction on the upper surface 112a of the pulse pattern plate 112.

On the same circle, the length of the A-phase convex pulse pattern 114a in the circumferential direction is equal to the length of the A-phase concave pulse pattern 115a in the circumferential direction, and the B-phase convex pulse pattern 114b. The length in the circumferential direction of is equal to the length in the circumferential direction of the B-phase concave pulse pattern 115b.

The side of the contact 113a that is in sliding contact with the upper surface 112a of the pulse pattern plate 112 is the upper surface 1
It is configured to be curved so as to bend back from 12a. Further, the height from the upper surface 112a to the tip of the contact 113a on the warped side is higher than the height from the upper surface 112a to the protruding end surface of the A-phase convex pulse pattern 114a.

The contact 113b is also the contact 113a.
And the contactor 11 from the upper surface 112a.
The height to the tip of the curved side of 3b is the upper surface 112a.
To the protruding end surface of the B-phase convex pulse pattern 114b.

As described above, the contacts 113a, 113b
The tip of each is curved so as to be higher than the height h1, so that the contacts 113a and 113b have the A-phase convex pulse pattern 114a and the B-phase convex pulse pattern 114b.
It is configured to be able to overcome each.

With the rotation of the pulse pattern plate 112, output terminals (not shown) connected to the contacts 113a and 113b respectively have a pulse 141a which is an A-phase output and a pulse 141b which is a B-phase output. Is output.

In the conventional electric actuator (not shown), the rotation angle of the output gear (not shown) is adjusted by detecting the pulses 141a and 141b.

[0021]

However, in the pulse generator 101 shown in FIG.
The portion P on the tip side (so-called R portion) that is warped from the upper surface 112a of the a and 113b is the A-phase convex pulse pattern 114.
The edges of the pulse patterns 141a and 141b are detected when they contact the a- and B-phase convex pulse patterns 114b.

Therefore, in the conventional pulse generator 101, the signal detection timing is deviated due to the influence of the step of the pulse patterns 114a and 114b and the tip side of the contacts 113a and 113b (so-called R portion), which is not shown. There is a problem that the rotation angle of the output gear cannot be detected more accurately.

The present invention has been made in view of the above problems, and is capable of accurately outputting the rotation angle of a pulse generator and the output gear capable of detecting the rotation angle of the output gear more accurately. It is to provide a possible electric actuator.

[0024]

According to the pulse generator of the present invention, the above-mentioned object is to provide a pulse generator which is arranged on a circular substrate and detects a rotation angle of the circular substrate to generate a pulse. And a pulse pattern plate extending in the radial direction of the circular substrate and having a conductive material and an insulating material alternately formed in the circumferential direction as uneven pulse patterns, and sliding contact with the plurality of uneven pulse patterns. And a contactor having a curved portion on the sliding contact side thereof, the circumferential angle of the convex pulse pattern among the plurality of concave-convex pulse patterns is greater than the circumferential angle of the concave pulse pattern. It is solved by the fact that it is formed small.

Since the circumferential angle of the convex pulse pattern is smaller than that of the concave pulse pattern in this way, when the convex pulse pattern and the contact are in contact with each other, the output terminal It is possible to prevent the detection timing from deviating from the output pulse and the pulse output from the output terminal when the concave pulse pattern is in contact with the contact.

More specifically, the pulse generator according to the present invention is the pulse generator according to claim 1, wherein the circumference of the circular substrate is equally divided by the number of the pulse patterns. The angle of circumference is 2θ, the radius of the curved portion is R, the height of the convex pulse pattern protruding from the concave pulse pattern in the rotation axis direction of the circular substrate is h, and the center of the pulse pattern plate is the contactor. Where r is the distance to the point of contact with the plurality of concave-convex pulse patterns, and the point of contact of the curved portion with the concave pulse pattern when the curved portion is in contact with the concave pulse pattern and the convex pulse pattern From the end to the contact-side end of the convex pulse pattern is L,
Then, the circumferential angle θa of the convex pulse pattern is
It is formed by the formula θa = θ-2dθ. Here, dθ
= Tan ⁻¹ (L / r), L = R × sin {cos ⁻¹
(R-h) / R}. By forming with such an angle, it is possible to prevent the deviation of the detection timing of the pulse signal due to the influence of the tip side of the contactor (so-called R portion), and it is possible to more accurately detect the rotation angle of the output gear. .

At this time, it is preferable that a sliding contact guide surface of the contact is formed on the circumferential side portion of the convex pulse pattern. Thus, when the sliding contact guide surface of the contactor is formed on the convex pulse pattern, the contact resistance between the contactor and the uneven pulse pattern is reduced, and the contact state between the contactor and the pulse pattern can be stabilized. . This makes it possible to reduce contact noise generated when the contactor gets on and off the pulse pattern, and it is possible to accurately detect the rotation angle of the output gear.

Further, the plurality of concave-convex pulse patterns includes a first pulse pattern and a second pulse pattern which are adjacent to each other in the radial direction of the pulse pattern plate, and the first pulse pattern is the second pulse pattern. With respect to the pulse pattern plate is formed to be displaced in the circumferential direction, the contactor is a first contactor and a second contactor slidably contacting the first pulse pattern and the second pulse pattern, respectively. It is configured with a contactor. With this configuration, it is possible to output a two-phase pulse having a phase difference from the output terminal, and it is possible to clearly determine which signal of the two-phase pulse is input first by the output signal. Therefore, it is possible to prevent the deviation of the pulse detection timing, detect the rotation angle of the output gear more accurately, and also detect the rotation direction of the circular substrate.

According to the electric actuator of the present invention, the above object is to provide an electric motor, a speed reduction mechanism having a plurality of gears for reducing the rotational force of the electric motor, and an output side of the speed reduction mechanism. A pulse generator for detecting a rotation angle of an output gear arranged to generate a pulse, the pulse generator extending in a radial direction of the output gear and in a circumferential direction. A pulse pattern plate in which a conductive material and an insulating material are alternately formed as a concave-convex pulse pattern, and a contactor which is in sliding contact with the plurality of concave-convex pulse patterns and has a curved portion on its sliding contact end side. In the plurality of concave-convex pulse patterns, the convex pulse pattern has a circumferential angle smaller than that of the concave pulse pattern. Ri is resolved.

In this way, since the rotation angle of the output gear is detected and the circumferential angle of the convex pulse pattern is formed smaller than that of the concave pulse pattern,
Due to the influence of the tip side of the contactor (so-called R portion), it is possible to prevent deviation of the pulse detection timing, it is possible to detect the rotation angle of the output gear more accurately, and it is possible to detect the rotation angle of the output gear. The rotation angle of the drive mechanism can be controlled with high accuracy.

In the above electric actuator,
The virtual circumferential angle of the pulse pattern obtained by equally dividing the circumference of the circular substrate by the number of pulse patterns is 2θ, the radius of the curved portion is R, the concave pulse pattern of the convex pulse pattern to the rotation axis of the output gear. The height protruding in the direction h,
The distance from the center of the pulse pattern plate to the point where the contactor abuts on the plurality of concave-convex pulse patterns is r, and the curve when the curved portion is in contact with the concave pulse pattern and the convex pulse pattern Assuming that the distance from the portion where the portion contacts the concave pulse pattern to the contact side end of the convex pulse pattern is L, the circumferential angle θa of the convex pulse pattern is the equation θa = θ− 2dθ, where dθ = tan
⁻¹ (L / r), L = R × sin {cos ⁻¹ (R−
h) / R}. By configuring in this way, it is possible to prevent the deviation of the pulse detection timing, it is possible to facilitate the design of a plurality of concave-convex pulse pattern that can more accurately detect the rotation angle of the output gear, It is possible to obtain an electric actuator capable of controlling the rotation angle of the driven mechanism connected to the rotation shaft with high accuracy.

At this time, a sliding contact guide surface of the contact may be formed on a circumferential side portion of the convex pulse pattern. In this way, when the sliding contact guide surface of the contactor is formed on the convex pulse pattern, the contact resistance between the contactor and the uneven pulse pattern is reduced, and the contact state between the contactor and the pulse pattern can be stabilized, It is possible to reduce the contact noise generated when the contactor gets on and off the pulse pattern, and it is possible to obtain the electric actuator that can accurately detect the rotation angle of the output gear.

The plurality of concave-convex pulse patterns include a first pulse pattern and a second pulse pattern that are adjacent to each other in the radial direction of the pulse pattern plate, and the first pulse pattern is the second pulse pattern. The contact pattern is formed to be displaced in the circumferential direction of the pulse pattern plate with respect to the pulse pattern, and the contact is a first contact and a first contact that are slidably contacted with the first pulse pattern and the second pulse pattern, respectively. You may comprise so that two contacts may be provided.

With this configuration, it is possible to output two-phase pulses having a phase difference from the output terminal, and it is possible to clearly determine which of the two-phase pulses is input first by the output signal. As a result, it is possible to prevent the deviation of the pulse detection timing, detect the rotation angle of the output gear more accurately, and also detect the rotation direction of the electric actuator.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, etc. described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

1 to 4 show a first embodiment according to the present invention, and FIG. 1 is a block diagram showing a pulse generator.
Is a sectional view taken along the line AA of FIG. 1, FIG. 3 is an explanatory view showing a sliding contact state between the pulse pattern plate and the contact, and FIG. 4 is an explanatory view showing a sliding state between the pulse pattern plate and the contact. 5 and 6 show a second embodiment according to the present invention, FIG. 5 is an explanatory view showing a sliding contact state between a pulse pattern plate and a contact, and FIG. 6 is a pulse pattern plate and a contact. It is explanatory drawing which shows the sliding state with. 3 to 6 are obtained by cutting the pulse pattern plate 12 along the line L1 through which the contact 13a passes in FIG. 1 and expanding the cut outer peripheral surface into a linear shape. 3 and 5 are partial views in which the pulse pattern plate 12 is rotated so that the children 13a and 13b move in the direction of arrow A in the figure.

7 and 8 show an example of the electric actuator according to the present invention, and FIG. 7 is a schematic structural view of the electric actuator. In order to make it easy to understand the internal structure of the electric actuator 11, a casing is provided. 1 shows a state in which the upper lid of the body 8 is removed, FIG. 8 is a schematic diagram showing an example of a control circuit of an electric actuator, FIG. 9 is a partial sectional view of FIG. 7, and FIG.
Reference numeral 0 is a schematic diagram of a vehicle air conditioner.

11 to 16 show modified examples, FIGS. 11 and 12 show modified examples of the present invention, FIG. 11 is an explanatory view showing a pulse pattern plate, and FIG. It is a BB sectional view. 13 and 14
Shows another modified example of the present invention, FIG. 13 is an explanatory view showing a pulse pattern plate, and FIG. 14 is a C of FIG.
FIG. 15 and 16 show still another modified example of the present invention, FIG. 15 is an explanatory view showing a pulse pattern plate, and FIG. 16 is a sectional view taken along line DD of FIG.

Embodiments of the pulse generator and the electric actuator according to the present invention will be described below with reference to the drawings. (First Embodiment) A pulse generator according to a first embodiment of the present invention will be described with reference to the drawings. In addition,
In the following example, the pulse patterns 14a and 14b are each composed of six pulse patterns for the sake of clarity, but
In actual use, it is composed of 32, 48, 64 or the like. The number of pulse patterns 14a and 14b is the same as that of the output gear 7
The detection of the rotation angle can be made highly accurate by increasing the pulse pattern in relation to the detection of the rotation angle.

As shown in FIG. 1, the pulse generator 1 is
A pulse pattern plate 12 disposed on the upper surface of the output gear 7 as a circular substrate, and a three-pole contactor 13 made of a conductive material and slidingly contacting the pulse pattern plate 12.
a, 13b, 13c.

The pulse pattern plate 12 is made of a conductive material formed by a well-known photo-etching method or a plating method on a disk-shaped plate body made of an insulating resin material. A plate 14 is arranged. Further, the pulse pattern plate 12 is
It is configured to rotate with the rotation of the output gear 7.

The conductive plate 14 is provided with substantially fan-shaped notches 14d and 14e formed in the circumferential direction by equally dividing the circumference of a circular substrate by the number of pulse patterns. Since the notches 14d are formed at equal intervals, the pulse pattern 14a having the circumferential angle θa is divided by the number of pulse patterns into equal parts of the virtual circular angle 2θ of the pulse pattern obtained by equally dividing the circumference of the circular substrate. Has been formed. For example, assuming that the number of pulse patterns is 6, 360 degrees is divided into 6 equal parts, so the virtual circumferential angle becomes 60 degrees. In this way, the virtual circumference angle changes according to the number of pulse patterns.

Similarly to the substantially fan-shaped cutouts 14e formed at equal intervals, the pulse pattern 14a is integrally formed with the pulse pattern 14a and the circumferential angle θb with the pulse pattern 14a inside the pulse pattern 14a in the radial direction. Circumferential angle θ with a phase difference of
A pulse pattern 14b of a is formed.

As shown in FIG. 2, the conductive plate 14
Are formed so as to vertically project on the upper surface 12 a of the pulse pattern plate 12.

As shown in FIGS. 1 and 3, each of the contacts 13a, 13b, 13c is formed such that the tip end side thereof, which is in sliding contact with the upper surface 12a of the pulse pattern plate 12, is bifurcated.
The tip side is the upper surface 12 of the pulse pattern plate 12.
It is formed as a curved portion 13d having a radius R and having a center on the vertical line of the upper surface 12a while slidingly contacting a.

The length (height H) between the free end tip of the curved portion 13d of the contacts 13a, 13b, 13c and the upper surface 12a is such that the A-phase convex pulse pattern 14a protrudes from the upper surface 12a ( It is longer than the height h).

As described above, the contacts 13a, 13b, 1
By forming the free end tip of the curved portion 13d of 3c so as to be higher than the height h, the contacts 13a, 13
b is the convex pulse pattern 14a, 14b
It is configured to be able to overcome each.

Further, the pulse pattern plate 12 has
As shown in FIG. 1, the pulse pattern 14a of the conductive portion (hereinafter referred to as the A-phase convex pulse pattern 14a) and the insulating portion 1 in which the upper surface 12a of the pulse pattern plate 12 is exposed.
5a (hereinafter, the A-phase concave pulse pattern 15a) are formed, and the contact 13a alternates between the A-phase convex pulse pattern 14a and the A-phase concave pulse pattern 15a as the pulse pattern plate 12 rotates. It is arranged so as to be in sliding contact with.

Similarly, in the contactor 13b, as the pulse pattern plate 12 rotates, the pulse pattern 14b of the conductive portion (hereinafter referred to as the B-phase convex pulse pattern 14b).
And the B-phase convex pulse pattern 15b (the insulating portion 15b where the upper surface 12a of the pulse pattern plate 12 is exposed) are alternately slidably contacted with each other.

Further, the contact 13c is arranged so as to be in sliding contact with the annular pulse pattern 14c of the conductive plate 14 at all times while the pulse pattern plate 12 is rotating.

Here, the virtual circumference angle of the pulse pattern obtained by equally dividing the circumference of the circular substrate by the number of pulse patterns is 2
θ, the radius of the curved portion 13d is R, the height of the convex pulse pattern protruding from the concave pulse pattern in the direction of the rotation axis of the circular substrate is h, and the contact pattern from the center of the pulse pattern plate 12 has a plurality of concave and convex pulse patterns. When the curved portion 13d is in contact with the concave pulse pattern and the convex pulse pattern, the distance to the contacting point is r, and from the point where the curved portion 13d contacts the concave pulse pattern to the contact side end of the convex pulse pattern. When the distance is L, the circumferential angle θa of the convex pulse pattern is set so as to be obtained by the equation θa = θ-2dθ using the correction value dθ.
Further, dθ is obtained by the equation dθ = tan ⁻¹ (L / r).

Here, r is the distance from the center of the pulse pattern plate 12 to the position where the contact 13a contacts the A-phase convex pulse pattern 14a, as shown in FIG.

Further, L is a contactor 1 as shown in FIG.
The curved portion 13d of 3a is a concave pulse pattern having an A-phase concave pulse pattern 15a and an A-phase convex pulse pattern 14
This is the distance from the point where the curved portion 13d contacts the A-phase concave pulse pattern 15a to the point where the curved portion 13d contacts the A-phase convex pulse pattern 14a when in contact with a. Then, L is an equation L = R × sin {cos
^-1 (R-h) / R}.

Note that r is the distance from the center of the pulse pattern plate 12 to the point where the contact 13b contacts the B-phase convex pulse pattern 14b as the convex pulse pattern as shown in FIG. Good.

Further, L is a contactor 1 as shown in FIG.
When the curved portion 13d of 3b is in contact with the B-phase concave pulse pattern 15b and the B-phase convex pulse pattern 14b, which are concave pulse patterns, the B-phase from the point where the curved portion 13d contacts the B-phase concave pulse pattern 15b. It may be the distance to the contact 13b side end of the convex pulse pattern 14b.

When the circumferential angle θa is calculated from the above equations, the circumferential angle θa is formed smaller than the circumferential angle θ. Therefore, on the same circle, the A-phase convex pulse pattern 14a
The length in the circumferential direction of A is shorter than the length in the circumferential direction of the A-phase concave pulse pattern 15a. Similarly, on the same circle, the length of the B-phase convex pulse pattern 14b in the circumferential direction is shorter than the length of the B-phase concave pulse pattern 15b in the circumferential direction. With the above configuration, it is possible to correct the deviation of the detection timing.

Next, the operation of the pulse generator according to the first embodiment will be described. As shown in FIG. 3, with the rotation of the pulse pattern plate 12, the output terminals connected to the contacts 13a and 13b respectively include
A pulse 41a that is an A-phase output and a pulse 41b that is a B-phase output are output.

Since the output side of this output terminal is pulled up to the power supply using a pull-up resistor, the pulse 41
a becomes high (H) when the contact 13a is in contact with the A-phase concave pulse pattern 15a, and the contact 13
It becomes low (L) when a is in contact with the A-phase convex pulse pattern 14a.

Similarly, the pulse 41b becomes high (H) when the contact 13b is in contact with the B-phase concave pulse pattern 15b, and the contact 13b is in contact with the B-phase convex pulse pattern 14b. In the state of being, it becomes low (L).

As described above, the A-phase convex pulse pattern 14
The length of a in the circumferential direction is the A-phase concave pulse pattern 15a.
However, since the contact 13a has the curved portion 13d, the contact timing between the contact 13a and the convex pulse pattern 14a can be adjusted. This is possible, and the pulse generator 1 corrects the deviation of the detection timing.

Similarly, the length of the B-phase convex pulse pattern 14b in the circumferential direction is shorter than the length of the B-phase concave pulse pattern 15b in the circumferential direction.
Since the curved portion 13d is formed at b, the contact 1
It is possible to adjust the contact timing between the 3b and the B-phase convex pulse pattern 14b, and the pulse generator 1 corrects the deviation of the detection timing.

As described above, since the A-phase convex pulse pattern 14a and the B-phase convex pulse pattern 14b are displaced in the circumferential direction, the pulse 41a and the pulse 41b have a constant phase difference.

(Second Embodiment) Next, the configuration of the pulse generator 21 according to the second embodiment will be described with reference to FIGS. The pulse generator 21 according to the second embodiment is different from the above-described first embodiment only in the shape of the conductive plate 14,
Since other parts and devices are the same as those shown in FIGS. 1 to 4, the same parts and devices are designated by the same reference numerals and the description thereof will be omitted.

In the pulse generator 21 according to the second embodiment, as shown in FIG. 5, a sliding contact guide surface of the contact is formed on the circumferential side portion. That is, in the example of FIG. 5, the circumferential side portion 14f of the A-phase convex pulse pattern 14a is formed in a slope shape, and is formed in a substantially trapezoidal shape. Similarly, the B-phase convex pulse pattern 14b is also formed in the shape of an inclined surface and is formed in a substantially trapezoidal shape. That is, the tangential cross-section of the circular substrate of the convex pulse pattern is formed in a substantially trapezoidal shape with the inclined surface 14f having a smaller projecting side edge than the non-projecting side edge. .

That is, the A-phase convex pulse pattern 14
The contact 13 is provided on the a and B-phase convex pulse pattern 14b.
An inclined surface 14f with which the curved portions 13d of a and 13b can slidably contact is formed with an optimum size.

In the pulse generator 21 according to the second embodiment, as shown in FIG. 6, the length of the A-phase convex pulse pattern 14a in the circumferential direction is set using the above equation. .

Next, the operation of the pulse generator 21 in the second embodiment will be described with reference to FIG.

As shown in FIG. 6, with the rotation of the pulse pattern plate 12, the output terminals connected to the contacts 13a and 13b respectively have a pulse 41 which is an A-phase output.
The pulse 41b which is a and B phase output is each output.

Since the output side of this output terminal is pulled up to the power supply by using a pull-up resistor, the pulse 41
a becomes high (H) when the contact 13a is in contact with the A-phase concave pulse pattern 15a, and the contact 13
It becomes low (L) when a is in contact with the A-phase convex pulse pattern 14a.

Similarly, the pulse 41b becomes high (H) when the contact 13b is in contact with the B-phase concave pulse pattern 15b, and the contact 13b is in contact with the B-phase convex pulse pattern 14b. In the state of being, it becomes low (L).

As described above, the A-phase convex pulse pattern 14
The length of a in the circumferential direction is the A-phase concave pulse pattern 15a.
Is formed to be shorter than the length in the circumferential direction, the curved portion 13d is formed on the contact 13a, and the side portion 14f in the circumferential direction of the A-phase convex pulse pattern 14a is formed into a sloped shape. The contactors 13a and 13b are formed, and the A-phase convex pulse pattern 14a and the B-phase convex pulse pattern 14b are formed.
It is possible to reduce contact noise generated when getting on and off the vehicle.

Regarding the relationship between the B-phase convex pulse pattern 14b and the B-phase concave pulse pattern 15b, the inclined surface 14
By forming f, the same operational effect as described above can be obtained.

As described above, since the A-phase convex pulse pattern 14a and the B-phase convex pulse pattern 14b are displaced in the circumferential direction, the pulse 41a and the pulse 41b have a constant phase difference.

In the embodiment shown in FIGS. 5 and 6, an example in which the inclined surface 14f is formed as the sliding contact guide surface of the contact is shown, but the sliding contact guide surface is not limited to this.
For example, the convex pulse pattern 14 shown as symbol P in FIG.
It also includes a mode in which the corner of a (that is, the protruding side corner portion of the circumferential side portion) is formed in an R shape.

Next, an electric actuator using the above pulse generator will be described with reference to FIGS. 7 to 10. 7 to 9 show an electric actuator, FIG. 10 shows a schematic view of a vehicle air conditioner, and FIG. 10 shows an example in which the electric actuator is applied to an air mix door of a vehicle air conditioner of a vehicle equipped with a water-cooled engine. Is.

The electric actuator 11 of this example drives a movable member such as an air mix door or a mode switching door of the vehicle air conditioner S. As shown in FIG. 10, an inside air intake port 203 for sucking the air inside the vehicle and an intake port 204 for sucking the outside air are formed in the air upstream side portion of the air conditioning casing 202 forming the air flow path. In addition, a suction port switching door 205 that selectively opens and closes these suction ports 203 and 204 is provided. The inlet switching door 205 is opened and closed by a driving means such as a servomotor or a manual operation. This inlet switching door 20
An air blower 207 is arranged at the downstream side of the air conditioner 5, and the air sucked by the air blower 207 from both of the suction ports 203, 204 is blown out by the blower ports 214, 215, 21 to be described later.
It is being blown to 7. An evaporator 209 serving as an air cooling unit is arranged on the air downstream side of the blower 207, and all the air blown by the blower 207 passes through the evaporator 209. A heater core 210 serving as an air heating unit is arranged on the air downstream side of the evaporator 209, and the heater core 210 heats the air by using the cooling water of the engine 211 as a heat source.

Further, a bypass passage 212 that bypasses the heater core 210 is formed in the air conditioning casing 202, and an air flow rate of the air volume passing through the heater core 210 and the air volume passing through the bypass passage 212 is formed on the air upstream side of the heater core 210. An air mix door 213 for adjusting the temperature is arranged. Then, the adjustment of the air volume ratio is performed by adjusting the opening degree of the air mix door 113 by the electric actuator 11 (details will be described later) according to the present embodiment.

Further, at the most downstream side of the air conditioning casing 202, there are a face outlet 214 for blowing out the conditioned air to the upper body of the passenger in the passenger compartment, and a foot outlet 215 for blowing air to the feet of the passenger in the passenger compartment. A defroster outlet 217 for blowing air toward the inner surface of the windshield 216 is formed.

Then, the respective outlets 214, 215, 2 above
Air outlet mode switching doors 218, 219, and 220 are disposed at the air upstream side portions of 17, respectively, and these air outlet mode switching doors 218, 219, and 22 are also provided.
0 is opened and closed by a driving means such as a third motor.

The electric actuator 11 of this embodiment includes a pulse generator 1, an electric motor 2 having a rotating shaft 3, a reduction mechanism 9 for reducing the rotation of the rotating shaft 3 and transmitting power to the rotating shaft 7a, and a connector. 10, an electric motor 2, a deceleration mechanism 9, a connector 10, and a housing 8 for housing the pulse generator 1.
Composed of and.

Although the pulse generator 1 shown in FIGS. 2 to 4 is used as the electric actuator 11 in the embodiment of the present invention, the pulse generator 21 shown in FIGS. good.

As the electric motor 2, a small direct current type brush motor having an armature, a brush and the like is used. The electric motor 2 is configured to be able to rotate the rotating shaft 3 in both forward and reverse directions.

For the electric actuator 11 of the present invention, the DC brush motor as described above is preferable because of its simple drive control and low cost, but the rotary shaft 3 can rotate in both directions. If necessary, a stepping motor, a brushless motor or the like may be used.

The reduction mechanism 9 includes a worm gear 4 arranged at one end of the rotary shaft 3, a worm wheel 5 rotatably supported by the rotary shaft 5a, and meshing with the worm gear 4.
The worm wheel 5 is rotatably supported by the rotary shaft 6a.
A spur gear 6 that meshes with the output gear 7 that is rotatably supported by the rotating shaft 7a and that meshes with the spur gear 6. The output gear 7 extends in the radial direction of the circular substrate and extends in the circumferential direction. A pulse pattern plate is provided in which a conductive material and an insulating material are alternately formed as an uneven pulse pattern.

The connector 10 includes the above-mentioned contacts 13a,
It is composed of an output terminal integrally formed with b and c, and an input terminal for supplying electric power to the electric motor 2. Further, the connector 10 is configured to be connected to an external control device (not shown).

Next, the control device 30 of the electric actuator 11 of this example will be described with reference to FIG. The control device 30 is a device for controlling the drive of the electric actuator 11, and as shown in FIG. 8, the control device 30 has a rotation angle detection means 31 and a motor drive circuit 32.

The rotation angle detecting means 31 recognizes the rotation angle and the rotation direction of the output gear 7 by inputting the pulse output from the pulse generator 1, and outputs a signal corresponding to this rotation angle to the motor drive circuit 32. Configured to output to.

The motor drive circuit 32 is configured to control the drive voltage to the electric motor 2 according to the signal output from the rotation angle detection means 31.

Next, the operation of the control device 30 of the electric actuator 11 will be described.

In order to operate the electric actuator 11 of this example, first, the control device 30 is connected to the electric actuator 11. Then, a constant applied voltage is applied from the motor drive circuit 32 of the control device 30 to the electric motor 2 of the electric actuator 11.

When a voltage is applied to the electric motor 2, FIG.
The rotating shaft 3 shown in FIG. When the rotary shaft 3 rotates, the worm gear 4 rotates, and the rotational force of the worm gear 4 is sequentially transmitted to the worm wheel 5, the spur gear 6, and the output gear 7 to drive the entire reduction gear mechanism 9.

When the output gear 7 rotates, the pulse generator 1 provided on the upper surface of the output gear 7 causes the output gear 7 to rotate.
A pulse corresponding to the rotation angle of is output.

Then, the rotation angle detecting means 31 receives this pulse and detects the rotation angle and the rotation direction of the output gear 7. Then, the rotation angle detection means 31 compares the pulse according to the rotation angle with the reference pulse, and outputs a signal according to the rotation speed of the output gear 7 to the motor drive circuit 32.

Then, the motor drive circuit 32 inputs a signal corresponding to the rotation speed of the output gear 7 output from the rotation angle detection means 31. Then, the applied voltage to the electric motor 2 is adjusted so that the rotation speed of the electric motor 2 becomes a set value. At this time, since the circumferential angle of the convex pulse pattern is smaller than the circumferential angle of the concave pulse pattern in the concave-convex pulse pattern, when the convex pulse pattern and the contact are in contact with each other. It is possible to prevent the detection timing from deviating from the pulse output from the output terminal and the pulse output from the output terminal when the concave pulse pattern is in contact with the contact. The rotation angle of the output gear can be detected more accurately. In addition, since it is possible to output a two-phase pulse with a phase difference from the output terminal, it is possible to clearly determine which of the two-phase pulse signals is input first by the output signal, and the rotation of the output gear It is possible to detect the angle more accurately and also to detect the rotation direction of the circular substrate.

The embodiment of the present invention can be modified as follows. Hereinafter, modifications of the embodiment of the present invention will be described with reference to the drawings.

(Modification 1) As shown in FIGS. 11 and 12, in the pulse pattern plate 12 of the pulse generator 1 according to the first embodiment, the conductive plate is formed in a concave shape, and the pulse pattern plate 12 is centered from the outer peripheral side. It may be formed on the side. That is, the A-phase convex pulse pattern 17a and the B-phase convex pulse pattern 17b are made of an insulating material and are formed from the center side to the outer peripheral side. The A-phase concave pulse pattern 16a, the B-phase concave pulse pattern 16b, and the annular pulse pattern 16c are made of a conductive material. The A-phase convex pulse pattern 17a
And the circumferential angle θa of the B-phase convex pulse pattern 17b is
It can be obtained from the above-mentioned equations.

(Modification 2) As shown in FIGS. 13 and 14, in the pulse pattern plate 12 of the pulse generator 1 according to the first embodiment, the conductive plate 18 is formed in a concave shape from the center side. It may be formed radially toward the outer peripheral side. That is, the A-phase convex pulse pattern 19a and the B-phase convex pulse pattern 19b are made of an insulating material and are formed from the outer peripheral side to the central side.
Further, the A-phase concave pulse pattern 18a, the B-phase concave pulse pattern 18b, and the annular pulse pattern 18c are
It is made of a conductive material. The circumferential angle θa of the A-phase convex pulse pattern 19a and the B-phase convex pulse pattern 19b can be obtained from the above-mentioned equations.

(Modification 3) As shown in FIGS. 15 and 16, this example is formed in the reverse of the examples of FIGS. 13 and 14, and the pulse generator 1 according to the first embodiment. In the pulse pattern plate 12, the conductive plate 20 may be formed in a convex shape. That is, the A-phase convex pulse pattern 20 a and the B-phase convex pulse pattern 20
b, the ring-shaped pulse pattern 20c is made of a conductive material. The A-phase concave pulse pattern 21a and the B-phase concave pulse pattern 21b are made of an insulating material. The circumferential angle θa of the A-phase convex pulse pattern 20a and the B-phase convex pulse pattern 20b can be obtained from the above-mentioned equations.

[0099]

As described in detail above, according to the present invention,
It is possible to obtain a pulse generator capable of detecting the rotation angle of the output gear more accurately and an electric actuator capable of accurately outputting the rotation angle of the output gear.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a pulse generation device according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram showing a sliding contact state between a pulse pattern plate and a contactor according to the first embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a sliding state between a pulse pattern plate and a contact according to the first embodiment.

FIG. 5 is an explanatory diagram showing a sliding contact state between a pulse pattern plate and a contact according to a second embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a sliding state between a pulse pattern plate and a contact according to the second embodiment.

FIG. 7 is a schematic configuration diagram of an electric actuator according to the present invention.

FIG. 8 is a schematic diagram showing an example of a control circuit for an electric actuator according to the present invention.

FIG. 9 is a partial cross-sectional view of FIG. 7.

FIG. 10 is a schematic diagram of a vehicle air conditioner.

FIG. 11 is an explanatory diagram showing a modified example of the pulse pattern plate according to the present invention.

12 is a sectional view taken along line BB of FIG.

FIG. 13 is an explanatory diagram showing another modification of the pulse pattern plate according to the present invention.

14 is a cross-sectional view taken along line CC of FIG.

FIG. 15 is an explanatory view showing still another modified example of the pulse pattern plate according to the present invention.

16 is a sectional view taken along line DD of FIG.

FIG. 17 is a configuration diagram showing a pulse generation device in a conventional technique.

FIG. 18 is an explanatory diagram showing a sliding contact state between a pulse pattern plate and a contact according to a conventional technique. Is.

[Explanation of symbols]

1, 21 pulse generator, 2 electric motor, 3, 5
a, 6a, 7a, 107a rotary shaft, 4 worm gear,
5 worm wheel, 6 spur gear, 7 output gear, 8
Case, 9 Speed reducer, 10 Connector, 11 Electric actuator, 12,112 Pulse pattern plate, 12a, 112a Top surface, 13a, 13b, 13
c, 113a, 113b, 113c Contactor, 13d
Curved part, 14, 114, 16, 18, 20 Conductive plate, 14a, 14b, 14c, 16a, 16b, 16
c, 18a, 18b, 18c, 20a, 20b, 20
c, 114a, 114b, 114c pulse pattern (conductive), 14f sliding contact guide surface (sloping surface), 15a,
15b, 17a, 17b, 19a, 19b, 21a, 2
1b, 115a, 115b pulse pattern (insulating), 30 control device, 31 rotation angle detection means, 32
Motor drive circuit, 41a, 41b, 141a, 141
b pulse, 113 air mix door, 202 air conditioning casing, 203, 204 inlet, 205 inlet switching door, 207 blower, 209 evaporator, 210 heater core, 211 engine, 212 bypass passage, 21
3 Air mix door, 214 Face outlet, 21
5 foot outlet, 216 windshield, 217
Defroster outlet, 218 outlet mode switching door

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 27, 2002 (2002.9.2)
7)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

The present invention has been made in view of the above problems, and an object thereof is to accurately detect the rotation angle of a pulse generator and the output gear that can detect the rotation angle of the output gear more accurately. An object is to provide an electric actuator capable of outputting. In addition, other eyes of the present invention
The contact noise is generated between the pattern step and the contact.
Pulse generator that can prevent
And the output gear rotation angle can be accurately output.
It is to provide a dynamic actuator.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0099

[Correction method] Change

[Correction content]

[0099]

As described in detail above, according to the present invention,
It is possible to obtain a pulse generator capable of detecting the rotation angle of the output gear more accurately and an electric actuator capable of accurately outputting the rotation angle of the output gear. In addition, the contact point between the pattern step and the contact
Pulse generation that can prevent noise
Accurate output of the rotation angle of the device and output gear
It is possible to obtain a possible electric actuator.

Continued front page    F term (reference) 2F063 AA35 BA30 BD16 CA05 CB12                       DA02 DA05 DC08 DD06 EA03                       FA08 KA02 NA06                 2F077 AA20 CC02 NN03 NN12 NN22                       PP03 QQ05 VV21

Claims (8)

[Claims] 1. A pulse generator which is disposed on a circular substrate and detects a rotation angle of the circular substrate to generate a pulse, the pulse generator extending in a radial direction of the circular substrate and conductive in a circumferential direction. A pulse pattern plate in which a material and an insulating material are alternately formed as a concavo-convex pulse pattern, and while being in sliding contact with the plurality of concavo-convex pulse patterns,
A contactor having a curved portion on its sliding contact end side, wherein a circumferential angle of the convex pulse pattern among the plurality of concave-convex pulse patterns is formed smaller than a circumferential angle of the concave pulse pattern. A pulse generator characterized in that 2. The virtual circumference angle of a pulse pattern obtained by equally dividing the circumference of the circular substrate by the number of the pulse patterns is 2.
θ, the radius of the curved portion is R, the height of the convex pulse pattern protruding from the concave pulse pattern in the direction of the rotation axis of the circular substrate is h, and the contact from the center of the pulse pattern plate is the plurality of contact points. The distance to the point of contact with the concave-convex pulse pattern is r, and when the curved portion is in contact with the concave pulse pattern and the convex pulse pattern, the curved portion is in contact with the concave pulse pattern. When the distance of the pulse pattern to the contact side end is L, the circumferential angle θa of the convex pulse pattern is formed by the equation θa = θ-2dθ, where dθ = tan ⁻¹ (L / R), L = Rxsin {cos ^-1 (Rh) / R}, The pulse generator according to claim 1 characterized by the above-mentioned. 3. The pulse generator according to claim 1, wherein a sliding contact guide surface of the contact is formed on a circumferential side portion of the convex pulse pattern. 4. The plurality of concavo-convex pulse patterns comprises a first pulse pattern and a second pulse pattern that are adjacent in the radial direction of the pulse pattern plate, and the first pulse pattern is the second pulse pattern. It is formed to be displaced in the circumferential direction of the pulse pattern plate with respect to the pulse pattern, and the contactor is a first contactor and a first contactor slidably contacting the first pulse pattern and the second pulse pattern, respectively. The pulse generator according to any one of claims 1 to 3, further comprising two contacts. 5. An electric motor, a reduction mechanism having a plurality of gears for reducing the rotational force of the electric motor, and a rotation angle of an output gear arranged on the output side of the reduction mechanism. And a pulse generator for generating pulses, the pulse generator extending in a radial direction of the output gear and circumferentially concavo-convex a conductive material and an insulating material alternately. A pulse pattern plate formed as a circular pulse pattern, and a contactor that is in sliding contact with the plurality of concave-convex pulse patterns and that has a curved portion on the sliding contact end side thereof. In the electric pulse actuator, the convex pulse pattern has a circumferential angle smaller than that of the concave pulse pattern. 6. The virtual circumferential angle of a pulse pattern obtained by equally dividing the circumference of the circular substrate by the number of the pulse patterns is 2
θ, the radius of the curved portion is R, the height of the convex pulse pattern protruding from the concave pulse pattern in the rotation axis direction of the output gear is h, and the contact from the center of the pulse pattern plate to the plurality of contact points The distance to the point of contact with the concave-convex pulse pattern is r, and when the curved portion is in contact with the concave pulse pattern and the convex pulse pattern, the curved portion is in contact with the concave pulse pattern. Where L is the distance to the contactor side end of the pulse pattern of, the circumferential angle θa of the convex pulse pattern is formed by the equation θa = θ-2dθ, where dθ = tan ⁻¹ ( L / r), L = Rxsin {cos ^-1 (Rh) / R}, The electric actuator according to claim 6. 7. The electric actuator according to claim 5, wherein a sliding contact guide surface of the contact is formed on a circumferential side portion of the convex pulse pattern. 8. The plurality of concavo-convex pulse patterns comprises a first pulse pattern and a second pulse pattern that are adjacent to each other in the radial direction of the pulse pattern plate, and the first pulse pattern is the second pulse pattern. It is formed to be displaced in the circumferential direction of the pulse pattern plate with respect to the pulse pattern, and the contactor is a first contactor and a first contactor slidably contacting the first pulse pattern and the second pulse pattern, respectively. The electric actuator according to any one of claims 5 to 7, further comprising two contacts.