JPH08178028A - Geared actuator - Google Patents

Abstract

PURPOSE: To provide a very inexpensive geared actuator by preventing noises and vibrations with a simple structure without improving the motor structure. CONSTITUTION: This geared actuator is provided with a motor 2 mounted on a housing 1, an output section 6 provided on the motor 2 to transmit the power of the motor 2, and a butt section 11 provided on the housing 1 and kept in contact with the tip section of the output section 6. The face of the butt section 11 to be kept in contact with at least the tip section of the output section 6 is tilted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a geared actuator, and more particularly to preventing noise and vibration generated when driving a motor.

[0002]

2. Description of the Related Art There is a conventional geared actuator as shown in FIG. In FIG. 5, reference numeral 21 denotes a resin molded housing.
A motor 22 is mounted on the. This motor 22
Motor positioning projection 23 formed on the housing 21
The position is fixed by. A worm gear 25 is fitted on the output shaft 24 of the motor 22, and the output shaft 24 and the worm gear 25 form an output portion 26 of the motor 22. Also, 27
Is a first gear, and the first gear 27 is attached so as to mesh with and interlock with the worm gear 25. The power of the motor 22 is transmitted from the output unit 26 to the first gear 27, and is finally converted into a predetermined power by the output gear 30 via the second and third gears 28 and 29 to be transmitted to an external device. What is supplied.

In such a conventional configuration, as shown in FIG. 3, the abutting portion 3 with which the tip of the output portion 26 abuts in order to suppress the rattling of the motor 22 in the thrust direction.
1 is provided in the housing 21, and rattling between the output shaft 24 and the bearing that rotatably supports the shaft 24 inside the motor 22 (hereinafter, referred to as radial rattling) is prevented. For this reason, there has been one in which the side pressure member 32 having elasticity is provided. Then, these configurations prevent noise and vibration caused by rattling in each direction.

[0004]

However, in the above structure, in order to prevent the rattling of the motor 22 in the thrust direction and the radial direction, separate biasing means must be provided. However, the structure of the apparatus body is complicated by that amount. Moreover, when the lateral pressure member 32 is provided as shown in the figure, the load is applied more than necessary, so that the lateral pressure member 32 is easily worn, and thus stable lateral pressure cannot be applied. Further, if these problems are solved on the motor side, the motor structure will be complicated, and it will be more difficult from the viewpoint of productivity or cost.

Therefore, the present invention solves the above problems and provides an extremely inexpensive geared actuator by preventing noise and vibration with a simple structure without improving the motor structure. .

[0006]

A geared actuator according to the present invention includes a motor mounted in a housing, an output portion provided in the motor for transmitting power of the motor, and an output provided in the housing. In a geared actuator having a butting portion with which a tip portion of the portion abuts, at least a surface of the abutting portion with which the tip portion abuts is inclined. Further, the abutting portion is preferably elastic. Further, the inclined portion can be linear or curved.

[0007]

By tilting at least the surface of the abutting portion with which the tip portion abuts, biasing force acts in each of the thrust direction and the radial direction of the motor, and rattling that occurs in these directions is suppressed. In addition, the contact area between the tip of the output part and the abutting part is small, and since the contact part is near the center of the output part, the linear velocity at that part is also very small, which causes wear of the abutting part. Is reduced.

[0008]

[First Embodiment] FIG. 1 is a plan view showing the structure of a geared actuator according to a first embodiment of the present invention.
Further, FIG. 2 is an enlarged view of a main part in FIG. In FIG. 1, reference numeral 1 denotes a housing made of, for example, resin, and a motor 2 is mounted on the housing 1.
The position of the motor 2 is fixed by a motor positioning protrusion 3 formed on the housing 1. A worm gear 5 is fitted to the output shaft 4 of the motor 2, and the output shaft 4 and the worm gear 5 are
And constitute the output unit 6 of the motor 2. Further, 7 is a first gear, and the first gear 7 is attached so as to mesh with the worm gear 5 and interlock with each other. The output of the motor 2 is transmitted from the output unit 6 to the first gear 7,
Further, it is finally converted into a predetermined power by the output gear 10 via the second and third gears 8 and 9 and supplied to an external device.

Up to this point, the process is the same as the conventional one. Here, what is different from the conventional one is that the abutting portion 11 with which the tip portion of the output portion 6 of the motor 2 abuts is arranged at an angle rather than at a right angle to the thrust direction of the motor 2 as shown in FIG. . The abutting portion 11 is made elastic so that the abutting portion of the output portion 6 with which the tip portion of the output portion 6 abuts is made thin so that the abutting portion 11 has elasticity.
1 may be configured, and in addition, an elastic member such as a spring may be attached separately from the housing 1.

With the above-mentioned structure, the tip of the output portion 6 of the motor 2 has the inclined portion 11a of the abutting portion 11.
By abutting against, the force F as indicated by the arrow in the figure is applied. This force F corresponds to a resultant force of the thrust direction force F1 and the radial direction force F2 of the motor 2, and the action of the force F1 can suppress the rattling of the motor 2 in the thrust direction. Since the side pressure acts on the output portion 6 of the motor 2 by the action of F2, the rattling in the radial direction can be suppressed. In this case, the contact area between the tip portion of the output portion 6 and the butting portion 11 is small, and since the contact portion is near the center of the output portion, the linear velocity at that portion is also very small, Since the wear of the abutting portion can be reduced as compared with the conventional case, a stable lateral pressure can be applied.

Since the force F can be easily adjusted by arbitrarily changing the inclination angle of the inclined portion 11a, a stable biasing force can be obtained. Further, in this embodiment, the abutting portion 11 is arranged so as to be inclined so that the surface of the output portion 6 with which the tip portion abuts is inclined, but at least the surface with which the tip portion abuts is formed. It suffices if it is inclined, and the configuration of the other parts is not particularly limited. With this configuration, it is not necessary to separately provide biasing means in the thrust direction and the radial direction of the motor as in the conventional case, and the main body of the device can be simplified.

[0012]

[Second Embodiment] FIG. 3 is an enlarged view of a main part of a geared actuator according to a second embodiment of the present invention. The same parts as those in FIG. 2 are denoted by the same reference numerals. In FIG. 3, an abutting portion 12 having a concave portion 13 corresponding to the tip portion of the output portion 6 is provided, and the concave portion 13 is provided.
The configuration is such that the tip portion of the output unit 6 fits inside. The abutting portion 12 may be configured to have elasticity.
The center of the output section 6 and the center of the recess 13 are slightly displaced so that the tip of the output section 6 is brought into contact with the recess 13. This is because the inclined portion 11a of the abutting portion 11 is linear in the first embodiment described above, whereas the curved inclined portion 12a is used in the present embodiment. Even in this case, the wear of the abutting portion 12 can be similarly reduced. Since the force F can be easily adjusted by arbitrarily changing the curvature of the inclined portion 12a, a stable biasing force can be obtained. The motor 2 configured in this way
It is also possible to suppress rattling in the thrust direction and the radial direction. In addition, the tip portion of the output portion 6 and the concave portion 13
The shape is not particularly limited.

[0013]

[Third Embodiment] FIG. 4 is a plan view showing the structure of a geared actuator according to a third embodiment of the present invention.
The same parts as those in FIG. 1 are denoted by the same reference numerals. In FIG. 4, the worm gear 5 is inserted so that the output shaft 4 fits through it, and the tip of the output portion 6 thus configured is brought into contact with the abutting portion 11. is there. In this way, the rattling of the motor 2 in the thrust direction and the radial direction can be suppressed. Incidentally, the present invention, by appropriately combining the above embodiments,
In addition, the present invention can be implemented with appropriate changes without departing from the spirit of the present invention. Further, in each of the above embodiments, the output shaft 4 and the worm gear 5 are configured as the output portion 6 of the motor, but the present invention is not limited to this, and a screw groove may be directly formed in the output shaft 4 to serve as the output portion. In short, the output part of the motor in the present invention is a part for transmitting the power of the motor to the outside, and can be implemented by appropriately changing it.

[0014]

As described above, according to the present invention, at least the surface of the abutting portion with which the tip portion of the output portion abuts is inclined, so that the rattling in the thrust direction and the radial direction of the motor is increased. Therefore, it is possible to prevent noise and vibration with a simple structure without improving the motor structure. Moreover, if comprised as mentioned above, abrasion of an abutting part can be reduced. Moreover, with such a configuration, it is not necessary to separately provide the biasing means in the thrust direction and the radial direction of the motor as in the conventional case, so that the apparatus main body can be simplified. Further, if the abutting portion has elasticity, a stable biasing force acts in the thrust direction and the radial direction of the motor, and the wear resistance is further improved. Further, by making the inclined portion linear or curved, the biasing force can be easily adjusted.

[0015]

[Brief description of drawings]

FIG. 1 is a plan view showing a configuration of a geared actuator according to a first embodiment of the present invention.

FIG. 2 is an enlarged view of a main part in FIG.

FIG. 3 is an enlarged view of a main part of a geared actuator according to a second embodiment of the present invention.

FIG. 4 is a plan view showing the structure of a geared actuator according to a third embodiment of the present invention.

FIG. 5 is a plan view showing a configuration of a conventional geared actuator.

[Explanation of symbols]

 1, 21 ... Housing 2, 22 ... Motor 4, 24 ... Output shaft 5, 25 ... Worm gear 6, 26 ... Output section 11, 12 ... Abutting section 11a, 12a ... Inclined section

Claims (4)

[Claims] 1. A motor mounted in a housing, an output portion provided in the motor for transmitting power of the motor, and an abutting portion provided in the housing with which a tip portion of the output portion abuts. In the geared actuator having the above-mentioned, the geared actuator is characterized in that at least a surface of the abutting portion with which the tip portion abuts is inclined. 2. The abutting portion has elasticity.
Geared actuator described. 3. The geared actuator according to claim 1, wherein the inclined portion is linear. 4. The geared actuator according to claim 1, wherein the inclined portion has a curved shape.