JPH02146358A - Geared motor - Google Patents

Abstract

PURPOSE:To prevent generation of a noise and an impact by providing a delay mechanism correlatively suppressing a returning speed of an output member in a gear train or in the output member. CONSTITUTION:When a motor A is cut off in its electrification, a movable part 3 starts to be reset to the original position by urging force of a reset means. Then also an output member B starts returning to the original position toward the direction of an arrow head Y. Returning force acting on this output member B is transmitted to an escape wheel 16 of a delay mechanism D from a connecting gear 19 through an output gear 1, many gears in a gear train C planet gear 14 and an internal thread gear 13 or the like in a planet gear mechanism 10, and the escape wheel 16 tends to rotate at a high speed. However, the escape wheel 16 can be rotated only in a step feed condition in every engagement and disengagement of an oscillating balance wheel 17, so that the escape wheel 16 slowly rotates. As the result, a returning speed of the output member B is suppressed, and the movable part 3 in a load 2 acts to be moderately reset.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a geared motor used to operate loads in various mechanical devices.

[Conventional technology]

This type of geared motor generally includes a motor and an output member for driving a load, and the two are connected by a gear train for deceleration.

[Problem to be solved by the invention]

In this conventional geared motor, when the load is reset by the restoring force of its own or other restoring means, the tooth train rotates rapidly and makes a loud noise, or the load is not reset. There were problems in that the impact force suddenly became louder, producing an impact sound, and that the load was damaged by the impact force.

The present invention has been made in view of the above points, and its purpose is to allow the above-mentioned load to return slowly and to prevent the occurrence of the above-mentioned abnormal noises and shocks. An object of the present invention is to provide a geared motor that can perform the following functions.

[Means to solve problems]

In order to achieve the above object, the present invention takes the measures as described in the claims above, and its effects are as follows.

[Effect]

When the motor rotates, its rotation is decelerated by the gear train and transmitted to the output member, which then operates. The actuating force actuates the load. When the load returns, the return action causes the output member to move back. The delay mechanism limits the speed of return movement of the output member. As a result, the load recovery operation becomes gradual.

〔Example〕

The drawings showing the embodiments of the present application will be described below.

In Fig. 1, A is a motor, B is an output member for driving a load, C is a gear train that connects the motor A and the output member B, and D is a delay mechanism that is linked to the gear train C. show.

As the motor A, a small motor such as a timer motor is used.

As the output member B, a rack is used as an example,
It is meshed with the output gear 1 and is configured to perform linear motion by rotation of the output gear 1.

A movable portion 3 of the load 2 is connected to the output member B so as to be able to move forward and backward in an integrated manner. Examples of the load include a drain valve in an electric washing machine or a shutter opening/closing mechanism in a ventilation fan.

The gear train C is composed of a pinion 6 attached to the rotating shaft of the motor A, a final stage gear 7 integrated with the output gear 1, and a large number of gears connecting them. . Also, a known planetary gear mechanism 10 is interposed in the middle. This planetary gear mechanism 10 has a well-known structure consisting of members indicated by numerals 11 to 15.
is a sun gear, 12 is an annular body, and an internal gear 1 is mounted on its inner peripheral surface.
3 is formed. 14 is a sun gear 11 and an internal gear 1
This is a planetary gear provided between the planetary gear 3 and the planetary carrier 15 so as to mesh with the two. The planetary gear mechanism 10 has the function of decelerating the rotation of the sun gear 11 and transmitting it to the planet carrier 15, and transmits the operating force from the motor to the output member B side, but the force from the output member B side is transferred to the motor A. It also has a clutch function to prevent transmission to the other side.

The above-mentioned delay mechanism is, for example, composed of an escape wheel 16 and a swingable balance 17 that engages with and disengages from the escape wheel 16 (known as a procurement mechanism in a timer), and is integrated with the escape wheel 16. Connecting gear 18
This meshes with a connecting gear 19 formed around the ring body 12 in the planetary gear mechanism 10.

Each of the above-mentioned members is attached to a case (not shown) in a well-known manner.

When it is desired to operate the movable part 3 of the load 2 in the above configuration, the motor A is energized.

When the motor A is energized and its rotating shaft rotates, the rotational force passes through the pinion 6, the planetary gear mechanism 10, and many other gears to the output gear 1, which rotates. As a result, the output member B moves linearly in the direction of the arrow X. Due to this linear movement, the movable part 3 of the load 2 is moved by a return means built into the load 2 (for example, a return spring; gravity may also be used).
The movement operation is performed against the urging force in the return direction applied by .

When the output member B is operated by the rotational force of the motor A as described above, a part of the rotational force of the motor A reaches the delay mechanism from the planetary gear mechanism 10 and disappears as a force that rotates the escape wheel 16. . However, since only a part of the rotational driving force of the motor A is lost, there is no problem in operating the output member B by the motor A.

When the output member B moves and reaches the terminal position as described above, if there is a risk that excessive force will be applied from the motor, for example, the rotation of the motor rotor can be stopped by a stop member provided on the output member. It is better to restrain the movement to prevent such excessive force from being applied to the output member.

Next, when you want to restore the movable part 3 of the load 2, cut off the power to the motor A. Then, the driving force is no longer transmitted from the motor A to the output member B, so the movable part 3 receives it from the output member B. I lose my power. As a result, the movable part 3 begins to return to its original position due to the urging force of the above-mentioned return means. Then, the output member B also begins to be returned to its original position in the direction of the arrow Y. The return force applied to the output member B is transmitted from the connecting gear 19 to the delay mechanism via the output gear 1, a large number of gears in the gear train C, the planetary gear 14 in the planetary gear mechanism 10, the internal gear 13, etc. This is transmitted to the other escape wheel 16, and the escape wheel 16 attempts to rotate at high speed. However, since the escape wheel 16 can only rotate in increments each time the swinging balance wheel 17 is engaged or disengaged, its rotation becomes slow. As a result, the return speed of the output member B is suppressed, and the movable part 3 under the load 2 returns slowly.

When the output member B returns in the return direction, the rotational force due to the return force is also applied to the sun gear 11 of the planetary gear mechanism IO. In this case, in this example, a motor using permanent magnets is used as the motor A, and when the power is not energized, the rotation of the rotor is restrained by the magnetic force of the permanent magnets. has a synchronous timer motor or stepping motor), so the sun gear 11 above
remains stopped. Even if a motor whose rotor can rotate freely when the power is not energized is used, the rotation of the sun gear 11 must be transmitted to the pinion 6 from the large gear tta, which is integrated with the sun gear, at an increased speed. The rotational speed of the sun gear does not become very high due to the inertial resistance of the rotor, so the return speed of the output member B can be suppressed by the delay mechanism without any problem.

The load 2 described above does not have a return means, and the output member B may be provided with a return spring as shown by reference numeral 3a. Further, the output member B may be a lever 5 that rotates integrally with the gear 7, or a bin 4 attached to the gear 7.

Next, FIG. 2 shows an example in which a stop mechanism 20 is attached to the delay mechanism. This stopping mechanism 20 includes an electromagnet 21,
It is composed of an attraction piece 22 which is adapted to be attracted by this, and a stop piece 23 which is integrated with the attraction piece 22, and when the electromagnet 21 is energized, the attraction piece 22 is attracted to the electromagnet. The stop piece 23 stops the movement of the balance wheel 17. When such a stop mechanism 20 is provided, if the electromagnet 21 is energized at the same time as the motor A is energized (for example, parallel connection), the rotational force of the motor A will actuate the output member B. In this case, the operation of the balance wheel 17 is stopped by the stop mechanism 20, so that the rotation of the escape wheel 16 is stopped. As a result, the above-mentioned loss of force can be eliminated. Note that this stopping mechanism 20 may be provided in the direction shown by the imaginary line to lock the balance wheel 17. Further, the stop piece 23 may be adapted to stop the escape wheel 16 instead of the balance wheel 17, or to directly stop the rotation of the ring body 12 in the planetary gear mechanism 10.

It should be noted that parts that are considered to have the same or equivalent configuration as those in the previous figure in terms of function are given the same reference numerals as in the previous figure, and redundant explanations are omitted. (Furthermore, the same concept will be used in the next and subsequent ones, and the same reference numerals will be used to omit duplicate explanations.) Next, Figures 3 to 5 show different examples of delay mechanisms. , 25 is a braking member, which is formed in an annular shape and is fixed (eg, integrally formed) to the case 26 of the geared motor. 28 is a boss, which is made of, for example, a synthetic resin material, and is rotated to the case 26 by a support shaft 29. It can be attached freely. The center of rotation and the annular braking member 25
It is aligned with the center of The boss 28 is also integrally formed with the connecting gear 18. Reference numeral 30 denotes an arm, the base of which is connected to the boss 28 (integrally formed in this example).As shown in the figure, the arm 30 is formed thin and has spring properties. 31 is a weight attached to the tip of arm 30,
The weight is such that sufficient centrifugal force is exerted upon rotation as described below. As the material, for example, metal is used, but other materials may also be used. Reference numeral 32 denotes a sliding portion, which in this example consists of a part of the side surface of the weight 31, but it is made up of a part of the arm 30. You can prepare for it.

With such a configuration, when the boss 28 is stopped or rotates slowly, no large centrifugal force acts on the weight 31, as shown in FIG. 5(^). As shown, the arm 30 is in a contracted state, and the sliding portion 32 and the braking member 25 are separated from each other.On the other hand, when the boss 28 is rotated at high speed, a large centrifugal force acts on the weight 31, so the arm 30 is It stretches against its springiness as shown in Figure 5 (B),
The sliding portion 32 rubs against the inner peripheral surface of the braking member 25. As a result, a braking force is generated there, and the high-speed rotation of the boss 28 is braked. Due to this function, the rotational speed of the boss 28 is maintained so as not to exceed a certain speed.

Even when the delay mechanism as described above is used in place of the delay mechanism shown in FIG. 1, the return speed of the output member B is suppressed by the delay mechanism in the same manner as in the above description.

Next is the 61st! 1 to 8 show an example of a specific configuration of a geared motor. In these figures, the motor A uses a permanent magnet in its rotor. That is, 35 is a coil, 36 is a magnetic pole piece, and 37 is a rotor, which has a structure in which an annular permanent magnet 37b is attached around a boss 37a made of a non-magnetic material, such as synthetic resin. The pinion 6 in the gear train is the boss 37 of the rotor 37.
It is formed integrally with a. Further, the output member rack B is guided in forward and backward movement by a guide piece 38 formed in a part of the case 26. In the stop mechanism 20, the suction piece 22 and the stop piece 23 integrally formed therewith are supported at their intermediate portions by a support member 39, and are configured to move like a seesaw in a direction perpendicular to the plane of the paper in FIG. It is. The stop piece 23 is adapted to engage and disengage from a protrusion 40 formed integrally with the boss 28 of the stop mechanism. Reference numeral 41 indicates a mounting piece for attaching the geared motor to a mechanical device.

Next, FIGS. 9 to 11 show further different examples of the delay mechanism. This delay mechanism includes a brake body 45 and a drive piece 46 for moving the brake body 45.

The brake body 45 is formed using a relatively heavy member, for example, a metal material, and is interposed between the case 26 and a position regulating piece 47 formed integrally with the boss 28.
axial movement is restricted. Further, a guide hole 48 is formed in the brake body 45, in which a guide piece 49 attached to the case 26 is positioned, so that the brake body 45
In Figure 1, it is designed so that it can reciprocate only in the left and right direction. On the other hand, the drive piece 46 is attached (for example, integrally formed) with the boss 28, and is positioned within an engagement window 50 provided in the brake body 45.

In the delay mechanism having such a configuration, when the boss 28 rotates, the drive piece 46 also rotates together with it.

In this case, for example, when the drive piece 4G rotates to the right from the state shown in FIG. Joining wall 50
b, and moves the brake body 45 to the right in the figure via the wall 50b. In this case the brake body 4 with weight
5 applies a braking force to the movement of the drive piece 46 by its inertia force. When the drive piece 46 further rotates from the state shown in FIG. 11(C), the drive piece 46 next comes into contact with the engagement wall 50a,
An attempt is made to move the brake body 45 to the left in the figure.

Even in this case, a braking force is applied to the drive piece 46.

In this way, the brake body 45 is swayed left and right by the rotation of the drive piece 46, and a braking force is applied to the drive piece 46 as a reaction.

In this case, the faster the rotating speed of the drive piece is, the greater the inertial force of the brake body 45 applies to the drive piece 46.

Next, FIG. 12 shows that the planetary gear mechanism 10 is placed in the middle of the gear train C.
This shows an example in which a clutch 53 is interposed instead. The clutch 53 is composed of a pair of clutch elements 54 and 55 that are engaged and disengaged from each other.

The clutch element 54 has a fixed axial position, and the clutch element 55 is movable in the axial direction. A connecting gear 56 is connected to the clutch element 55 so as to be integrally rotatable, and the rear gear in the gear train C and the delay mechanism are connected to this gear 56.

Reference numeral 57 indicates a clutch operation mechanism, which has the same structure as the above-mentioned stop I9 mechanism. That is, 58 is an electromagnet, 59 is an adsorption piece, and 60
indicate the respective operation pieces.

With such a configuration, for example, by energizing the electromagnet along with the motor A on the 5th day, the clutch element 55 is engaged with the clutch element 54 by the operating piece 6o of the operating mechanism 57 when the motor A is activated. As a result, the rotational force of the motor is transmitted to the rear gear of the gear train through the clutch 53 and the connecting gear 56.

If the power supply to the motor A is cut off while the power supply to the electromagnet 58 is maintained, that is, if the clutch 53 is maintained in the connected state by the operating mechanism 57, the rotor rotation of the motor A will not occur when the power is not supplied as described above. If a restraining structure is used, the return movement of the output member B can be stopped through the tooth train C by a portion of the restraining force.

On the other hand, if it is desired to restore the load, the operation mechanism 57 is released and the clutch 53 is disengaged.

Then, the rotational force in the return direction transmitted from the output member to the gear train C is applied to the delay mechanism through the connecting gear 56, and the return speed of the output member is braked.

Next, FIG. 13 shows an example of a different connection location of the delay mechanism, in which the delay mechanism is connected to the intermediate gear 6 in the gear train C.
This shows an example in which 3 is connected.

Further, the stop piece 23 of the stop mechanism 20 is configured to lock a retaining portion 66 (for example, a protrusion) provided on the ring body 12 of the planetary gear mechanism 10. The above-mentioned delay mechanism may be connected to other gears, such as the gear 64.7, depending on the required degree of suppression of the return speed of the output member or the ability of the delay mechanism to exert a suppressing effect. Or connected to the output member B itself! (For example, gear 18 for connection
(to mesh with rack teeth newly provided on the output member).

〔Effect of the invention〕

As described above, in the present invention, when operating the load 2, when the motor A is rotated, the output member B is operated via the tooth train C. Therefore, the load 2 is operated by the driving force of the motor A. Not only does it have the effect of It has the effect of returning the vehicle to its original state, and is useful in preventing the generation of abnormal noises and shocks caused by the sudden return as in the prior art.

Moreover, even if the device can operate as described above,
When the manufacturer determines the time required to activate and return the load 2, the former is determined by selecting the reduction ratio of the tooth train C, and the latter is determined by the delay mechanism. Depending on the degree of suppression of return speed,
Each has features that can be determined individually. This has the utility of being able to easily meet the different demands of various users.

[Brief explanation of the drawing]

The drawings show embodiments of the present application; FIG. 1 is an exploded perspective view, FIG. 2 is a perspective view of the stop mechanism, and FIGS. 3 to 5 show different embodiments of the delay mechanism. , FIG. 3 is an exploded perspective view, FIG. 4 is a vertical sectional view, FIG. 5 is an explanatory diagram of operation, and FIGS. 6 to 8 show an example of a specific configuration of a geared motor. Fig. 6 is a partially cutaway plan view of the case, Fig. 7 is a cross-sectional view taken along the line ■-■, Fig. 8 is a cross-sectional view taken along the line ■-■, and Figs. 9 to 11 are further different embodiments of the delay mechanism. 9 is an exploded perspective view, FIG. 1O is a vertical sectional view (cross-sectional view taken along the line X-X in FIG.
The figure is a partial perspective view showing an example in which a clutch is interposed in the gear train, and FIG. 13 is an exploded perspective view showing an example in which the delay mechanism is linked at a different location. A: Motor, B: Output member, C: Tooth gear train, D:
...Delay mechanism. Fig. Fig. Fig. 8 Fig. Fig. Fig. Fig. Fig. G Fig. 10 Fig. Fig. Fig. 3

Claims (1)

[Claims] A geared motor has a motor and an output member for driving a load, and the gear train is connected between them by a tooth train that decelerates the rotation of the motor and transmits it to the output member. The output member is a geared motor in which a delay mechanism is connected to suppress the return speed of the output member.