JPH02236026A - Geared motor - Google Patents

Abstract

PURPOSE:To reduce the production cost by a method wherein a clutch is engaged by movement of a weight which is linked with a motor so that they are integrally rotated and made to move outward from a steady position by its centrifugal force. CONSTITUTION:When a switch is closed to supply power to a motor B, a rotor 6 rotates, a pinion 7 rotates in the direction of an arrow 7a, and rotation force is transmitted to a sun gear 20 of a clutch F via a gear 17, a sun gear 12, a planet gear 14 and a planet carrier 15 to have the sun gear 20 rotated in the direction of an arrow 20a. On the other hand rotating body 43 and a weight 50 rotate together by rotation of the rotor 6, and the weight 50 moves outward from the center axis of the rotating body 43 due to its centrifugal force. This movement causes a moving part 47 to approach the rotating body 43 while an operating part 53 also moves interlockingly. Therefore, an operating unit 56 is located within a rotation orbit of an engaging piece 60 of an interlocking ring 59. Since The engaging piece 60 is thus in contact with the operating unit 56 even if the interlocking ring 59 is to rotate, rotation of the interlocking ring 59 is prevented to have rotation of a ring gear 21 of the clutch F prevented thereby permitting the clutch to be engaged.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a geared motor that can be used to drive various mechanical devices.

[Prior Art] This type of geared motor has a clutch interposed in the middle of the gear train that connects the motor and the output member for driving the load, and when the load is not being driven, the clutch is disengaged and the load is not being driven. This allows for free movement of the body. The clutch is operated by an electromagnet.

[Problem to be solved by the invention]

This conventional configuration has the problem that the price of the geared motor increases because the electromagnet is expensive.

The present invention has been made in view of the above points, and its purpose is to operate the clutch using the rotation of a motor that is essential for driving a load. To provide a geared motor having a structure that enables the following to be carried out, thereby reducing the product price.

[Means for Solving the 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, the weight rotates in conjunction with it. The weight moves outward due to the centrifugal force generated by its rotation, and the clutch is engaged by this movement. Then, the rotational force of the motor is transmitted to the output member through the clutch, and the output member is operated. Actuation of the output member drives the load.

〔Example〕

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

In FIG. 1, the geared motor includes a base frame A, a motor B, an output mechanism C, and a gear train D for decelerating and transmitting the rotational force of the motor to the output mechanism C. It is configured. Furthermore, a rotary force cutting mechanism E and a clutch F are interposed in series in the middle of the tooth train D. The rotational force cutting mechanism E is for preventing the rotational force of the motor B from being transmitted to the output mechanism C side when the output mechanism C is at the terminal position, and the clutch F is connected to the motor B. This is for connecting or disconnecting the connection with the output mechanism C. The above-mentioned cutting mechanism E is attached with a cutting operation mechanism G, and the above-mentioned clutch F is attached with a clutch operation mechanism H and a reverse stop mechanism I.

The base frame A is constituted by a case 1, a cover 2, and stators 3 and 4 of a motor B, which are integrated by, for example, screwing means not shown. As the motor B, a small motor known as a timer motor is used, and includes magnetic poles 3a and 4a formed by cutting and raising a part of the stator, and a coil 5 for magnetizing the poles.
, has a rotor 6 etc. constructed using permanent magnets. 7 is a pinion connected to the rotor 6.

Next, the output mechanism C will be explained. 8 is an output shaft rotatably attached to the case 1 and the cover 2, an output gear 9 is integrally formed in the middle part, and an output lever 10 exemplified as an output member is attached to the end projecting from the case 1. is stuck.

Next, the gear train D for deceleration is a well-known gear train constructed using a plurality of gears, and in FIGS. 1 and 4, reference numeral 11 indicates the presence of these gears.

Next, as shown in FIG. 4, the rotating force cutting mechanism E uses a planetary gear mechanism in this example, and 12 is a sun gear, 13 is a ring gear, 14 is a planetary gear, and a shaft body attached to a planetary carrier 15 is used. It is held by 16.

The sun gear 12 is connected to the pinion 7 via an integrally formed gear 17.

Next, the clutch F also uses a well-known planetary gear mechanism in this example, as clearly shown in FIG. It is rotatably held by 24. The sun gear 20 is integrally formed with the planetary carrier 15 in the cutting mechanism E, and the planetary carrier 23 is integrally formed with an interlocking gear 25, which is connected to one end of a large number of gears 11 for deceleration. It has been done. Note that the reference numeral 26 is the same as the reference numeral 12. 17, 15, 20, 23. It is a shaft body for rotatably supporting the member indicated by 25.

Next, the above-mentioned reverse stop mechanism I will be explained. The mechanism is the second
As clearly shown in FIG. 4, it is composed of a ratchet tooth 28 formed on the outer periphery of the planetary carrier 23 and a ratchet pawl 29 for engaging and disengaging with the ratchet tooth 28. It is installed. Further, an integrally formed spring piece 31 is attached to the ratchet pawl 29, and the spring piece 31
2 to urge the ratchet claw 29 toward the ratchet teeth 28.

Next, the cutting operation mechanism G will be explained based on FIGS. 1, 3, and 4. A cam 35 is attached to the output shaft 39, and is rotationally driven by a cam drive piece 36 integrally formed with the output gear 9. Reference numeral 37 denotes a driven piece pivotally connected to the cover 2, and receives the urging force of a driven spring piece 38 so that its tip always comes into contact with the outer periphery of the cam 35. Reference numeral 39 denotes an operation piece integrally formed with the driven piece 37, which is connected to the ring gear 13.
It is possible to engage and disengage with a large number of engaging portions 40 formed on the outer periphery of the. The shape of the tip of the operating piece 39 and the shape of the retaining portion 40 are such that when the two are engaged, the ring gear 13 is prevented from rotating in the direction of arrow 1'' shown in FIG.

Next, the clutch operating mechanism H will be explained based on FIGS. 1 and 4. Reference numeral 43 denotes a rotating body, which is rotatably attached to a shaft body 44 attached to the case 1 and the stator 3, and is connected to the pinion 7 of the motor B via an integrally formed gear 45 and a connecting gear 46. There is. Reference numeral 47 denotes a mover, which is attached to the shaft body 44 so as to be rotatable and movable in the axial direction, and a link 48.47 is connected to the rotating body 43 in a pantograph shape. 49 to enable rotation integrally with the rotating body 43. 5o is a weight, and both links 48. By being attached to the connecting portion of the rotating body 49, it is possible to rotate integrally with the rotating body 43 and to move freely in the radial direction. 51 is the rotating body 4
A compression spring interposed between the weight 5 and the mover 47
These are illustrated as pull-back means for exerting a pull-back force on o toward its rotation center, and reference numerals 43 and 47
48. The above-mentioned pulling force is applied through a member indicated by 49. Reference numeral 53 denotes an operating piece, the shaft part 54 formed at the base thereof is fixed to the case 1 in the base frame A, and the middle part is pressed against the movable element 47 by a spring piece 55 and is adapted to the movement of the movable element 47. They are designed to work together. The operation piece 53 has an operation part 56 at its tip, and is capable of locking and releasing the ring gear 21, which is a movable part for important operations in the clutch F. That is, in this example, an interlocking gear 57 is formed on the outer periphery of the ring gear 21, and an interlocking wheel 59 is integrally formed on the interlocking gear 58 meshed with the gear 57, and a plurality of locking wheels are formed around the interlocking gear 58. A piece 60 is provided, and the operating portion 56 can be engaged with and removed from the retaining piece 60.

In this configuration, the interlocking wheel 59 is the gear 5 compared to the ring gear 21.
7. Since the gear ratio has been increased by 58, the interlocking wheels are 59
The rotational torque is weak, so the operating portion 56 can lock the engagement piece 60 with a light force. However, the ring gear 2l may be provided with an engagement piece 60 and the engagement piece 60 may be locked by the operating portion 56 without using the members indicated by the above-mentioned symbols 57 to 59.

Next, in the geared motor having the above configuration, the motor B is connected to the power plug 62 and the switch socket 6 as shown in FIG.
3 and electrical wiring.

Next, the operation of the guard mode will be explained. When the motor B of the geared motor is not energized yet, the cutting operation mechanism G is in the state shown in FIG. 3, and the operation piece 39 locks the rotation of the ring gear 13. In this state, the switch 63 is closed and the motor B
When energized, the rotor 6 rotates. This rotation causes the pinion 7 to rotate in the direction of the arrow 7a, and the rotation force is applied to the gear 17, the sun gear 12, the planet gear 14, and the planet carrier 1.
5 to the sun gear 20 of the clutch F, and the gear 20 rotates in the direction of the arrow 20a. On the other hand, due to the rotation of the rotor 6, the rotating body 43 also rotates, and the weight 50 is attached to the rotating body 43.
rotates with. When the weight 50 rotates, the centrifugal force acting on it causes the weight 50 to move outward away from the central axis of rotation of the rotating body 43. Due to this movement, the mover 47 moves in a direction closer to the rotating body 43, and the operating piece 53 also moves in conjunction with this movement. As a result, the operating portion 56 is located within the rotation locus of the engagement piece 60 in the interlocking wheel 59.

Therefore, even if the interlocking wheel 59 attempts to rotate, the engagement piece 60 will come into contact with the operating portion 56, so that the interlocking wheel 59 will be prevented from rotating. That is, the rotation of the ring gear 21 in the clutch F is prevented, and the clutch F becomes in the normal state.

In the above state, the rotation of the sun gear 20 in the direction of the arrow 20a is transmitted to the planetary carrier 23 through the planetary gear 22, which rotates in the direction of the arrow 23a. In this case, since the ratchet teeth 28 and ratchet pawls 29 are formed in the shape shown clearly in FIG. 2, rotation of the planet carrier 23 in the direction of the arrow 23a is not hindered. The rotation of the planetary carrier 23 as described above is transmitted from the gear 25 to the output gear 9 via the deceleration gear 11, and the output shaft 8
rotates in the direction of arrow 8a. The rotational force is transmitted to a load (not shown) through the output lever 1o, and the load is actuated. Examples of the above-mentioned loads include the shutter mechanism of a ventilation fan and the drain valve of a washing machine.

When the rotation of the output lever 10 reaches the final position, the tip of the driven piece 37 falls into the recess 35a of the cam 35 in the cutting operation mechanism G, as shown in FIG.

As a result, the operating piece 39 separates from the engaging portion 4o. In such a state, the ring gear 13 in the cutting mechanism E
Since it becomes possible to rotate freely, transmission of rotational force from the sun gear 12 to the planetary carrier 15 becomes impossible.

Therefore, the above-mentioned driving force is no longer transmitted to the output shaft 8. As a result, the load is prevented from being over-moved and damaged.

Further, when the output lever 10 reaches the terminal position as described above, even if the load is provided with a return means (for example, a return spring), the return of the load is prevented in the following manner. That is, when the return force of the load is applied to the output lever 10 and the output shaft 8 attempts to rotate in the direction opposite to the arrow 8a, the rotation force is transmitted to the planetary carrier 23 through the tooth train l1 in the opposite direction to the arrow 23a. It is added as a directional force. However, rotation of the planet carrier 23 in such a direction is prevented by the engagement of the ratchet pawl 29 with the ratchet teeth 28. Therefore, the return rotation of the output shaft 8 in the above-mentioned direction is not performed.

Next, when the switch 63 is opened, the power supply to the motor is stopped and the rotation of the rotor 6 is stopped. Then, the rotation of the weight 50 in the clutch operating mechanism H also stops, and the centrifugal force acting on the weight 50 disappears. Then the weight 50 becomes the spring 51
The moving element 47 moves in a direction away from the rotating body 43 accordingly.

As a result, the operating portion 56 of the operating piece 53 is connected to the engaging piece 60.
Evacuate from the rotation trajectory. As a result, the ring gear 21 in the clutch F is released. That is, the clutch F is in a disengaged state, and the connection between the output mechanism C and the motor B is severed.

In the above state, the planet carrier 23 will move as shown by the arrow 23.
It becomes possible to rotate in the direction opposite to a. As a result, the output shaft 8 is rotated to return in the direction opposite to the arrow 8a due to the return force exerted on the output lever 10 from the load. In addition to the case where the above-mentioned return means is provided for the load as described above,
It may also be provided on the output shaft or output lever.

Next, FIGS. 7 and 8 showing different embodiments of the present application will be explained. This example shows a different example of the configuration of the rotational force cutting mechanism.
is mounted so that it can move forward and backward in the axial direction and rotate freely. A pair of engaging portions 66 that can be freely engaged and disengaged from each other are provided on opposing surfaces of the clutch gear 65 and the linking gear 17e. 67, and a clutch spring 68 is interposed between the clutch gear 65 and the linking gear 17e to separate the two. The clutch gear 65 is a gear 69 for connection. 7
0 to the sun gear 20e in the clutch Fe.

In such a configuration, before the output shaft 8e is at a position other than the terminal position, the clutch gear 65 is moved to the side of the linking gear 17e by the operation piece 39e of the cutting operation mechanism Ge, and the retaining portion 66. 67 is engaged. Therefore, the rotational force from the motor is transmitted to the next-stage clutch via them. On the other hand, when the output shaft 8e rotates to the terminal position, the driven piece 37e moves into the recess 35ae of the cam as shown in FIG.
As a result, the thalasso gear 65 is separated from the gear 17e, and the engagement portions 66 and 67 are disengaged. For this reason, the rotational force of the motor is no longer transmitted to the next stage clutch.

It should be noted that parts that are functionally the same or equivalent to those in the previous figure are given the same reference numerals as in the previous figure with the letter e, and redundant explanations are omitted.

Next, instead of the planetary gear mechanism as the clutch F, a clutch having the same structure as the disconnection mechanism shown in FIG.

〔Effect of the invention〕

As described above, in the present invention, when it is desired to drive a load, by rotating the motor B, the clutch F is turned on and the output member is operated, and the load is driven using the rotating force of the motor B. This has the effect of making it easy to drive.

On the other hand, if you want to stop driving the load and allow it to move freely, by stopping motor B, the clutch F can be disengaged and the connection between the output member and the motor B can be severed. Even if the motor B is difficult to rotate in a non-energized state, there is an effect that the load can be freely moved.

Moreover, even if the clutch F is turned on and off as described above, it is configured to perform the above-mentioned cutting by utilizing the movement of the weight 50, which rotates with the rotation of the motor, due to centrifugal force. Because of this, the structure for performing the above-mentioned human cutting has the advantage that only extremely inexpensive members are needed. This has the economical effect of making it unnecessary to use expensive electromagnets as in the conventional configuration, and reducing the price of the geared motor.

Moreover, in the present invention, when motor B is started, the load is not connected and the weight 50 is simply turned, and only after the rotation of motor B has increased in speed, clutch F is engaged by centrifugal force to load the motor B. Since the motor B is connected to the motor B, there is an advantage that even a motor with a small starting force can be used as the motor B.

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and Fig. 1 is a vertical cross-sectional view of the main part of the gear motor, Fig. 2 is a plan view of the clutch and reverse stop mechanism, and Fig. 3 is a rotational force cutting mechanism and cutting operation. Fig. 4 is an exploded perspective view, Fig. 5 is an electric circuit diagram, Fig. 6 is a diagram similar to Fig. 3 showing the operating state of the cutting operation mechanism, and Fig. 7 is an exploded perspective view showing the relationship with the mechanism. FIG. 8 is a longitudinal cross-sectional view of a main part showing different examples of the power cutting mechanism; FIG. 8 is a partial view showing the operating state of the rotational force cutting mechanism of FIG. 7; A...Base frame, B...Motor, mechanism, D...Deceleration gear train, F/H...Clutch operation mechanism.・Output・Clutch, QT

Claims (1)

[Claims] It has a motor and an output member for driving a load, and these are connected by a gear train for deceleration with a clutch in the middle. In a geared motor equipped with an operating mechanism for operation, the operating mechanism is connected to the motor so as to be able to rotate integrally with the motor, and is moved outward from a normal position by centrifugal force generated by the rotation. a geared motor, the geared motor having a weight that is connected to a movable portion of the clutch such that the weight is moved in the outward direction to engage the clutch;