JPH01315236A - Spring return type control motor - Google Patents

Abstract

PURPOSE:To prevent a motor from overrotating by releasing a spring brake if an accident such as a power interruption or the like occurs, and rotating a sun gear and a planetary gear around it so that the rotation of a spring shaft is not transmitted to the motor. CONSTITUTION:The normal rotation of a motor 1 is transmitted to a spring shaft 15 through gears 5, 4, 10, 11, 13, 14, 17, 16, and a spring 6 is wound. After the spring 6 is completely wound, the rotation of the motor 1 is transmitted to an output shaft 3 through a planetary gear 13 and an arm 12. An accident, such as a power interruption or the like occurs, a spring brake 22 is released, and the shaft 3 is rapidly reversely rotated. In this case, since a sun gear 14 and the gear 13 are rotated around it, the rotation of the shaft 15 is not transmitted to the motor 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a spring return type control motor.

(Prior art) Fig. 5 is an explanatory diagram of a conventional spring return type control motor, in which 1 is a reversible motor, 2 is a motor shaft, 3 is an output shaft that drives, for example, an air conditioning valve or damper, etc., and 4 is an output shaft. 3 is a fixed drive gear, 5 is a reduction gear inserted between this drive gear 4 and the motor shaft 2, and 6 is a spiral gear wound by the output shaft 3 when the output shaft 3 is driven in the forward direction. Showing the spring.

In such a spring return type control motor, the motor 1 has a built-in brake, and when the brake is released and the stator coil is energized to rotate the motor 1 in the forward direction, the output shaft 3 is rotated through the gears 5 and 4. rotates in the forward direction, for example to open an air conditioning valve or damper, and at the same time the spring 6 is wound.

Further, when closing the air conditioning valve or damper during normal operation, the motor 1 is rotated in the opposite direction to reverse the output shaft 3.

In this case, the spring 6 operates to rotate the output shaft 3 in the reverse direction at high speed, but the rotation speed is suppressed by the rotation of the motor 1 in the reverse direction and does not increase.

If an accident such as a power outage occurs while the air conditioning valve or damper is open, the brake of the motor 1 will be released and the output shaft 3 will immediately rotate at high speed in the opposite direction due to the force of the spring 6, causing the air conditioning valves and dampers will close promptly.

(Problem to be Solved by the Invention) However, in such a conventional spring return type control motor, the reduction ratio by gears 4.5 is usually 1:
It is large, about 3000, and there is no problem while rotating while driving motor 1, but when there is no restriction due to driving motor 2, during a power outage, the force stored in spring 6 causes it to rotate in reverse to close the air conditioning valve and damper. Sometimes, the rotation speed of the rotor of the motor 1 is about 1000 Or, p, etc. until the air conditioning valve or damper is completely closed.
If the rotation of the output shaft 3 suddenly stops due to the air-conditioning valve or damper being in the fully closed position, the motor 1 will be stored in the rotor of the motor 1 and the gear 4. There was a risk that the air conditioning valve, damper, gear 5, etc. would be damaged due to the extremely large inertial energy generated.

The object of the present invention is to obtain a spring return type control motor which eliminates such drawbacks.

FIG. 6 shows a conventional rotation speed suppressing mechanism 7 for a spring brake. This mechanism has flat blades 8 protruding from both sides of a brake shaft 9, so that when the brake shaft 9 rotates, the rotation speed suppressing mechanism 7 axially moves upward. As a result, there was a risk that the rebrake, which had a large rake plate gap of about 0.35 mm, would not be able to operate.

An object of the present invention is to obtain a rotational speed suppressing mechanism for a spring brake that eliminates such drawbacks.

(Means for Solving the Problems) A spring return type control motor of the present invention includes a reversible motor, an output shaft, a spring wound by a spring shaft, and a coupling mechanism that interconnects the motor, the output shaft, and the spring shaft. The coupling mechanism includes an internal gear rotatably supported by the output shaft and rotated by the motor, a sun gear rotatably supported by the output shaft, an outer periphery of the sun gear, and the internal gear. A planetary gear inserted and meshed between internal teeth of the gear, an arm connecting the shaft of the planetary gear and the output shaft, and a large gear concentrically and integrally fixed to the sun gear; It consists of a spring gear fixed to the spring shaft meshed with the large gear, and a brake mechanism that suppresses rotation of the spring gear in one direction.

The spring return type control motor of the present invention has the advantage that the rotation caused by the spring during rapid reverse rotation is not transmitted to the deceleration mechanism or the motor, thereby preventing damage to the motor, etc.

The spring brake rotational speed suppressing mechanism of the present invention includes a brake shaft, a brake engaged with the brake shaft, a speed increasing mechanism for increasing the rotation speed of the brake shaft, and the brake shaft and the spring gear. It consists of a one-way clutch that is engaged when the brake shaft inserted therebetween rotates in the reverse direction.

The spring brake rotational speed suppressing mechanism of the present invention has the advantage that the gap between the brake plates can be maintained at an extremely small value, and the brake can be reliably applied.

(Example) The present invention will be explained in detail below with reference to the drawings.

In the present invention, as shown in FIG. 1, rotation is transmitted between the drive gear 4 and the output shaft 3 in the direction of the output shaft 3 during normal rotation, but in the case of reverse rotation, the rotation is transmitted from the output shaft 3. A first coupling mechanism is inserted so that rotation is not transmitted in the direction of the gear 4, a second coupling mechanism is inserted between the output shaft 3 and the spring 6, and a spring brake is further provided to suppress rotation of the spring 6. A mechanism 21 is provided.

The first coupling mechanism includes a small gear 10 fixed to the shaft of the drive gear 4, an annular gear 11 rotatably supported by the output shaft 3 and having external teeth meshed with the small gear 10.
Two arms 12 extend from the output shaft 3 in a direction perpendicular to the axis and further extend in the same direction parallel to the output shaft 3, and the annular gear 11 is rotatably supported by the arms 12, respectively.
A sun gear 14 is rotatably supported by the output shaft 3, and the planet gear 13 is meshed with the outer periphery of the sun gear 14.

The second coupling mechanism is rotatably supported by a spring shaft 15 around which the spring 6 is wound, a spring gear 16 fixed to the spring shaft 15, and the output shaft 3, and is rotatably supported by the spring gear 16. It is composed of a large gear 17 which is concentric with the sun gear 14 and is integral with the sun gear 14.

Further, the brake mechanism 21 includes the spring gear 16.
The intermediate gear 18 and the one-way clutch 19 and speed increaser 20 are in a disconnected state when rotating in the direction in which the spring 6 is wound.
It is composed of a spring brake shaft 9 and an excitation-operated spring brake 22, which are connected via a spring brake shaft 9.

Since the spring return type control motor of the present invention has the above-described configuration, if the brake of the motor 1 is released and the spring brake 22 and the stator coil are energized to rotate the motor 1 in the forward direction, this rotation will be caused by the gear 5,
4.10, 11, 13, 14°17.16 to the spring shaft 15, and the spring 6 is wound. At this time, the one-way clutch 19 is used to brake the spring shaft 1 by the spring brake 22.
Not included in 5.

After the spring 6 is completely wound, the sun gear 14 is fixed via the gears 16 and 17, so the motor 1
The rotation is transmitted to the output shaft 3 via the planetary gear 13 and the arm 12, and opens, for example, an air conditioning valve or a damper.

Also, when closing the air conditioning valve or damper during normal operation, the spring brake 22 is activated and the motor 1 is closed.
When the motor 1 rotates in the opposite direction, the spring brake 22 works via the one-way clutch 19 to fix the gears 18, 16, 17, and 14 in the reverse direction. The output shaft 3 rotates in reverse at a predetermined rotational speed, closing the air conditioning valve and damper.

However, if an accident such as a power outage occurs while these are open, the spring brake 22 will be released and the elastic force of the spring 6 will be applied to the gears 16, 17, even if the motor 1 does not rotate in the opposite direction. 14,13. The signal is transmitted to the output shaft 3 via the arm 12, and the output shaft 3 is rapidly reversed. Note that at this time, since the planet gear revolves together with the sun gear 14, the rotation of the spring shaft 15 is not transmitted to the motor 1.

Further, the speed increaser 20 in the embodiment increases the rotation of the spring brake shaft 9 connected to the spring shaft 15, and operates the spring brake 22 on the spring brake shaft 9 rotated at an increased speed, thereby increasing the brake. This is to make the action more effective.

In the above-mentioned embodiment, an excitation-operated electromagnetic brake is used as the spring brake 22, so a current is constantly passed through the spring brake 22.
When used to open and close gas valves, etc., there is a risk of violating safety standards.

In the above embodiment, the spring brake 2 is used only during a power outage.
2 is released and the air conditioning valve or damper is closed by the action of the spring 6, and the spring brake 22 cannot be artificially released at any time, for example, in the event of a fire.

Therefore, in another embodiment of the present invention, a non-excited electromagnetic brake is used as the spring brake 22, which performs a braking action when the current is cut off, and when the emergency switch is pressed, the electromagnetic brake is released by direct current. .

In still another embodiment of the present invention, a permanent magnet actuated electromagnetic brake that constantly performs braking action using a permanent magnet is used as the electromagnetic brake in the second embodiment, and when the emergency switch is pressed, the permanent magnet electromagnetic brake is activated by a DC power source. A reverse magnetic field acts on the brake to release the brake.

It should be noted that the DC power source used in the second and third embodiments has enough energy to release the electromagnetic brake for about 1 second required for the spring 6 to return, and a commercially available small dry cell battery may be used. By incorporating the control motor into the case (not shown) surrounding the control motor, just one switch for emergency operation is provided outside the case, and an emergency operation circuit is configured completely independent of other power sources. Because of this, it is possible to construct a highly safe control motor for opening and closing valves.

FIGS. 2 to 4 show a rotational speed suppressing mechanism 7 of the present invention used in a spring brake 22, and this mechanism 7 has both ends 23 of a flat blade 8 as shown in FIG. They are formed by bending in opposite directions vertically at the symmetrical diagonal line 24 that slopes inward toward the bottom, and the center portion thereof is fixed to the spring brake shaft 9.

The rotational speed suppressing mechanism 7 having such a configuration generates a force that constantly presses the spring brake shaft 9 downward in the axial direction when the spring brake shaft 9 rotates, so even when the spring brake shaft 9 rotates, the gap between the brake plates is reduced. For example, 0.15n
It has the effect of being able to maintain a constant value as small as about v.

(Effects of the Invention) As described above, according to the present invention, it is possible to prevent over-rotation of the motor in the event of an accident such as a power outage, and to prevent damage to various parts due to inertial energy of the rotation transmission part, and to obtain a more preferable rotational speed suppression mechanism. There are great benefits that can be made.

In addition, by making the electromagnetic brake for the spring a non-excitation operating type or a permanent magnet type, it is possible to energize the electromagnetic brake to return the spring and close the valve.Furthermore, it is possible to use a small battery as the power source for releasing the electromagnetic brake. By incorporating it into the case, there is an advantage that a highly safe spring return type control motor can be configured.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the spring return type control motor of the present invention, Figs. 2 to 4 are a front view, a partial plan view and a developed view of the rotational speed suppressing mechanism of the spring brake, respectively, and Fig. 5 is a conventional one. FIG. 6 is an explanatory diagram of a conventional spring return type control motor. 1... Reversible motor, 2... Motor shaft, 3...
... Output shaft, 4... Drive gear, 5... Reduction gear, 6
...Spring, 7...Rotation speed suppression mechanism, 8...
・Blade, 9... Brake shaft, 10... Small gear, 11
...Annular gear, 12...Arm, 13...Planetary gear, 14...Sun gear, 15...Spring shaft, 1
6...Spring gear, 17...Large gear, 18.
...Intermediate gear, 19...One-way clutch, 20...
Speed increaser, 21...Brake mechanism, 22...Spring brake, 23...Both ends of the blade.

Claims (7)

[Claims] (1) Consists of a reversible motor, an output shaft, a spring wound by a spring shaft, and a coupling mechanism that interconnects the motor, output shaft, and spring shaft, and the coupling mechanism is rotatably supported by the output shaft. an internal gear rotated by the motor, a sun gear rotatably supported by the output shaft, and a planetary gear inserted and meshed between the outer periphery of the sun gear and the internal teeth of the internal gear. , an arm connecting the shaft of the planetary gear and the output shaft, a large gear concentrically and integrally fixed to the sun gear, and a spring fixed to the spring shaft meshed with the large gear. A spring return type control motor comprising a spring gear and a brake mechanism that suppresses rotation of the spring gear in one direction. (2) The brake mechanism includes a brake shaft, a brake engaged with the brake shaft, a speed increasing mechanism that speeds up the rotation of the brake shaft, and a brake mechanism inserted between the brake shaft and the spring gear. Claim 1 comprising a one-way clutch that is engaged when the brake shaft rotates in the reverse direction.
Spring return type control motor as described. (3) The spring return type control motor according to claim 2, wherein the brake is an excitation actuated electromagnetic brake. (4) The spring return type control motor according to claim 2, wherein the brake is a non-excitation operated electromagnetic brake, and has a mechanism for releasing the brake by applying power. (5) the brake is a permanent magnet type electromagnetic brake;
3. The spring return type control motor according to claim 2, further comprising a mechanism for releasing the brake by applying a reverse magnetic field to the rebrake upon application of power. (6) The spring return type control motor according to claim 4 or 5, further comprising a battery that supplies current to the electromagnetic coil of the electromagnetic brake. (7) The brake shaft has a rotational speed control mechanism, and the rotational speed control mechanism is comprised of flat blades extending from both sides of the brake shaft and having both end edges bent upward and downward, respectively, along diagonal lines. A spring return type control motor according to claim 2, 3, 4, 5 or 6.