JPH02159942A - Geared motor - Google Patents

Abstract

PURPOSE:To facilitate variation of driving speed or driving force of load by arranging plural rows of teeth engageable with rows of gear wheels on the side face at the root section of an output member supported by a guide for guiding the output member linearly with respect to the case and arranging a coupling section at the tip thereof. CONSTITUTION:Case G is provided with a guide 16 for linearly guiding an output member B and a plurality of teeth 20 to be engaged with gears 23 in a gear wheel C are arranged on the side face at the root section of the output member B being supported by the guide 16, and a coupling section 21 is arranged at the tip thereof. When the gear wheel C is rotary driven through a motor A, linear driving force appears at the tip of the output member B and a next stage driven member is operated linearly. When a customer specifies the advance/retreat speed or push/pull driving force of the output member B, it can be coped with quickly and easily by selecting the pitch of the tooth at the root section, the width at the root section or corresponding number of tooth or the diameter of the gear 23.

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 includes a motor and an output member for driving a load, and the two are connected by a gear train for deceleration. Further, the output member is configured to rotate.

[Problem to be solved by the invention]

This conventional geared motor has a problem in that when it is desired to drive a load that operates linearly, a mechanism for converting rotational operation to linear operation must be interposed between the load and the output member, which is cumbersome.

The present invention has been made in view of the above points, and its purpose is to be able to directly actuate a load linearly, and to easily change the drive speed and magnitude of the drive force of the load. It is an object of the present invention to provide a geared motor having a structure that enables the following.

[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, the rotation is decelerated by the gear train and transmitted to the output member, and the output member operates linearly.

The actuating force actuates the load.

〔Example〕

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

In Figures 1 to 5, G is a case, and A to D are cases G.
, where A is a motor, B is an output member for driving a load, C is a gear train that connects motor A and output member B, and D is a gear train that connects to tooth train C. The respective delay mechanisms are shown below.

The motor A uses a rotor with a permanent magnet. That is, 10 is a coil, 11 is a magnetic pole piece, 12
is a rotor, and the boss 12a is made of a non-magnetic material, for example, synthetic resin.
A structure in which an annular permanent magnet 12b is attached around the periphery is used. Note that 13 is a pinion in the tooth train C, which is formed integrally with the boss 12a of the rotor 12. As the motor A described above, it is also possible to use a small motor with another structure.

The output member B is formed into a rod shape, and the base portion is located inside the case G, and the tip portion is made to protrude outside the case G.

Reference numeral 15 denotes a guide groove provided in the output member B, which is formed long in the longitudinal direction of the output member B, and is fitted with a guide 16 formed integrally with the case G.
The output member B is supported by. Guide 16 above
In FIG. 2, it is formed long in the direction perpendicular to the plane of the paper, and is designed to guide the forward and backward movement of the output member B in that direction.

In case G, the peripheral edge 18 of the portion of the output member B through which the neck 17 passes may be used as a guide having the above function.
20, 20... are a large number of teeth formed on the side surface of the base of the output member B, and are arranged in a straight line as shown in the figure.

Reference numeral 21 denotes a connecting portion provided at the tip of the output member B, to which a movable portion 23 that moves linearly under a load 22 is connected so as to be able to move back and forth as a unit. 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 includes the binion 13, the output gear 23 meshed with the teeth 20 of the output member B, and the output gear 2.
3, and a large number of gears connecting the pinion 13 and the gear 24. Also, there is a known planetary gear mechanism 2 on the way.
5 is without intervention. The output gear 23 is rotatably mounted on bearings 23a and 23b provided in the case G. The planetary gear mechanism 25 has a well-known structure consisting of members indicated by numerals 26 to 30, in which 26 is a sun gear, and 27 is a sun gear.
is a ring body, and an internal gear 28 is formed on the inner peripheral surface thereof. A TI star gear 29 is provided between the sun gear 26 and the internal gear 28 so as to mesh with them, and is held by a planetary carrier 30.

The above delay mechanism will be explained. 32 is a braking member;
A boss 33 is formed in an annular shape and is fixed (for example, integrally formed) on the case G of the geared motor, and is made of a synthetic resin material, for example, and is rotatably attached to the case G with a support shaft 34. . The center of rotation is made to coincide with the center of the annular braking member 32. Further, this boss 33 is integrally formed with a connecting gear 33a. This gear 33a meshes with a connecting gear 35 formed around the ring body 27 in the planetary gear mechanism 25. 3
Reference numeral 6 denotes an arm, the base of which is connected to a boss 33 (integrally formed in this example).As shown in the figure, the arm 36 is formed thin and has spring properties. Reference numeral 37 denotes a weight attached to the tip of the arm 36, and is designed to be heavy enough to exert a sufficient centrifugal force during rotation as described later. For example, metal is used as the material, but other materials may also be used.
Reference numeral 38 denotes a sliding portion, which in this example is formed by a part of the side surface of the weight 37, but may be provided by a part of the arm 36.

Next, 40 is a stop mechanism attached to the delay mechanism.

This stop mechanism 40 includes a wM1 stone 41, a suction piece 42 that is attracted by the wM1 stone, and a stop piece 43 that is integrated with the suction piece 42. The suction piece 42 and the stop piece 43 are supported at their intermediate portions by a support member 44, and are configured to move like a seesaw in a direction perpendicular to the plane of the paper in FIG. The stop piece 43 is adapted to engage and disengage from a protrusion 45 formed integrally with the boss 33 of the stop mechanism.

Reference numeral 46 indicates a mounting piece for mounting the geared motor to a mechanical device.

When it is desired to operate the movable part 23 of the load 22 in the above configuration, the motor A is energized.

When the motor A is energized and its rotor 12 rotates, the rotational force passes through the pinion 13, the planetary gear mechanism 25, and many other gears to reach the output gear 23, which rotates. As a result, the output member B undergoes direct expansion movement in the direction of the arrow X.

This linear movement causes the movable part 23 in the load 22 to
The load 22 is operated to move linearly against the biasing force in the return direction applied by a return means built into the load 22 (for example, a return spring may have zero gravity).

When operating the output member B by the rotational force of the motor A as described above, the electromagnet 41 in the stop mechanism 40 is energized at the same time as the motor A is energized (
For example, connect in parallel), then in the above case, the stop piece 43
engages with the protrusion 45 to prevent rotation of the boss 33, thereby preventing unnecessary rotation of the ring body 27 in the planetary gear mechanism 25.

When the output member B moves as described above and reaches the terminal position, if there is a risk that excessive force will be applied from the motor, for example, the output member should be restrained from rotating the motor rotor. It is preferable to provide a stop member such as that shown in FIG. 1 to prevent such an excessive force from being applied to the output member.

Next, when it is desired to return the movable part 23 of the load 22, the power to the motor A is cut off. Then, from motor A to output member B
Since no driving force is transmitted to the output member B, the movable part 23 receives no force from the output member B. As a result, the movable part 23 begins to return to its original position by the urging force of the return means. B also begins to be linearly returned to its original position 1 in the direction of arrow Y. This return force applied to output member B is applied to boss 33 of the delay mechanism via gear train C.

The delay mechanism then operates as follows. When the rotation speed of the boss 33 is slow, no large centrifugal force acts on the weight 37, so the arm 36 is in a contracted state as shown in FIG. He is away from 32. On the other hand, if the rotation speed of the boss 33 is high, a large centrifugal force acts on the weight 37, so the arm 36 resists its springiness as shown in Fig. 6 (
B), the sliding portion 38 is extended as shown in FIG.
It rubs against the inner circumferential surface of. As a result, a braking force is generated there, and the high-speed rotation of the boss 33 is braked.

Due to this function, the rotational speed of the boss 33 is maintained so as not to exceed a certain speed. As a result, the return speed of the output member B is suppressed, and the movable part 2 under the load 22
3, the return operation is gradual. In the above case, the rotation of the rotor 12 of the motor A is restricted by the magnetic attraction force between the permanent magnet 12b and the magnetic scraper 11. The load 22 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 47.

Next, the relationship between the output member B and the output gear 23 will be explained based on FIG. 7. The guide 16 of the output member B and the bearings 23a, 23b of the output gear 23 are both provided in the case G, and their mutual positional relationship is constant. The output member B and the output gear 23 to be attached to these can be attached in the (al or false) state. +al is a portion of the output member B whose position is defined by the guide 16 (guide groove 1
The distance from position 5) to tooth 20 is small, and output gear 2
The radius of 3 is correspondingly large.

Mountains) are the opposite. If the radius of the output gear 23 is large as shown in (a), the output given to the output member B is small;
0), the output is large. Therefore, by preparing various output members B and output gears 23 as shown in (a) and ('b) before assembling the geared motor, it is possible to meet the various demands of users regarding the driving force. Compatible geared motors can be manufactured.

The same applies to the forward/backward speed of the output member B; for a constant rotational speed of the output gear 23, the forward/backward speed of the output member B can be increased in case (a), and can be decreased in case (1)). .

In the above embodiment, an example is shown in which the output member B is driven in a retracting manner. There is also an example of this (using a motor that can rotate forward and reverse).

Next, FIGS. 8(a) and 8(bl) show examples of different structures of the output member.+a+ is composed of a flexible plate having elasticity in the middle part, and the connecting part 21e is oriented in the forward and backward direction of the load. It is designed to be able to respond to movements in different directions. (bl is a connecting portion 21f that allows a string 49 to be fastened for connection to a load.

In addition, parts that are functionally the same or equivalent to those in the previous figure are marked with the same reference numerals as before, followed by the letter e,
Duplicate explanations have been omitted by adding f.

(Also, the same idea will be used in the next version, and the redundant explanation will be omitted by adding the letter g.) Next, FIG. 9 shows another example of means for differentiating the driving force of the output member.
Bearing 23ag of output gear 23g.

The gears 23bg are arranged in multiple stages on one arc 51 centered on the rotation center of the gear 50 in the previous stage that meshes with the gear 24g.

Output gears 23g, 23g", 23g" with different radii,
By selectively mounting these bearings, the driving force can be changed.

〔Effect of the invention〕

As described above, in the present invention, the case has the output member B.
The output member B supported by the guide 16 is provided with a guide 16 for guiding the output member B linearly forward and backward.
A plurality of teeth 20 that mesh with the gears 23 in the tooth train C are arranged on the side surface Bb of the base part Ba, and a connecting part 21 is provided on the tip part Bc, so that the tooth train C can be connected to the motor. By rotationally driving the output member A, the rotational force appears as a linear drive at the tip of the output member B, which has the effect of linearly operating the next driven member.

Moreover, when there is an order from the consumer regarding the advance/retreat speed of the output member B and the magnitude of the pushing/pulling driving force, according to the above configuration of the present invention, the pitch of the plurality of teeth in the base part Ba or the seventh As can be understood from the example in the figure, the width dimension of the base portion Bb or the number of teeth of the corresponding gear 23 can be quickly adjusted by appropriately selecting the diameter, and the requests of important persons can be easily accommodated. There is some usefulness that can be done.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and Fig. 1 is a partially cutaway plan view of the case, Fig. 2 is a sectional view taken along the line Tl-11, Fig. 3 is a sectional view taken along the line ■-■, and Fig. 4. 5 is an exploded perspective view showing the transmission path of the driving force, FIG. 5 is an exploded perspective view showing the output member and the output gear, FIG. 6 is an explanatory diagram of the operation of the delay mechanism, and the seventh leap line shows the connection between the output member and the output gear. FIG. 8 is a plan view showing the relationship, FIG. 8 is a perspective view showing a different embodiment of the output member, and FIG. 9 is a plan view showing a different embodiment of the driving force changing means. G...Case, A...Motor, B...Output member,
C...Tooth gear train, 16...Guide, 20...Teeth, 21
...Connection part. Figure 9 Figure Z Figure 3 Figure (A) (B)

Claims (1)

[Claims] In a geared motor, the case is equipped with a motor and an output member for driving a load, and these are connected by a gear train that decelerates the rotation of the motor and transmits it to the output member. The case is provided with a guide for linearly guiding the output member forward and backward, and a plurality of guides are provided on the side surface of the base of the output member supported by the guide for meshing with the gears in the gear train. A geared motor with rows of teeth and a connecting part at the tip.