JP3406413B2 - Geared actuator - Google Patents

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. FIG. 6 is a plan view excluding an upper case (not shown), and 21 is a lower case made of resin molding, which constitutes a housing H together with the upper case, and a motor 22 is mounted in the housing H. . The position of the motor 22 is fixed by a motor positioning protrusion 23 formed on the lower case 21. 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. Further, 27 is a first gear, and the first gear 2
The reference numeral 7 is attached to the worm gear 25 so as to mesh with and interlock with each other. 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 structure, as shown in the same figure, conventionally, in order to suppress the rattling of the motor 22 in the thrust direction, the tip of the output part 26 is formed together with the lower case 21 to abut. Some of them have an abutting portion 31. Further, rattling due to the clearance between the output shaft 24 and the bearing that rotatably supports the shaft 24 in the motor 22 (hereinafter, referred to as radial rattling).
In order to suppress the above, the side pressure member 32 having elasticity has been provided. Furthermore, set the output shaft to the thrust direction and the radial direction.
JP-A-64-74342 as a structure for urging the directional force
There is one disclosed in the report. To configure like this
Therefore, it is caused by rattling in each direction.
It prevented noise and vibration. However, like this
Some of them use metal spring material separately, so
Material cost and installation are time-consuming, and because it is made of metal
Wear problems come around.

[0004]

In the above construction, in order to prevent the rattling of the motor 22 in the thrust direction and the radial direction, separate biasing means must be provided. As a result, the structure of the device body becomes complicated. 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 a geared actuator of excellent quality by preventing noise and vibration with a simple structure without improving the motor structure. It is in.

[0006]

A geared actuator according to the present invention comprises a lower case (1) and a lower case (1).
In the resin housing (H) having the upper case (14),
Output part (6) which is formed by arranging gear part (5) on output shaft (4)
The geared motor (2) having a shape to said housing
Stored through the formed motor positioning protrusion (3)
Together, responds with the output section in order to supply in conjunction with the output of the geared motor a predetermined power to the external device
Store the output gear (10) and move the geared motor forward.
The tip of the output part is in the abutting part arranged on the housing.
In a geared actuator assembled so as to be pressed against each other, the abutting portion is integrally made of resin and is raised from the lower case (1) of the resin housing , and at least a surface where the tip portion of the output portion abuts is inclined. At the same time, the elastic member (12, 12) is placed in the space defined by the butting part (11) and the lower case (1) of the housing (H).
13), and this elastic member is
Do not slip off by covering the upper case (14)
It can be achieved in what was. The elastic member may be a leaf spring formed in a curved shape. Further, the elastic member may be a coil spring.

[0007]

SUMMARY OF The resin abutting portion, at least the output
The tip portion of the shaft is configured to be inclined abutting surface, by arranging an elastic member configured in space and its abutment portion and the housing, the resilient member, the resin
Becomes that the position is fixed by the inner wall of the manufacturing abutting portion and the housing, the thrust direction and the radial direction of the motor has to reduce a variation in biasing force due to the influence of the thickness of the abutting portion in a stable biasing force Reduces rattling.

[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.
2 is an enlarged view of a main part in FIG. 1, and FIG. 3 is a cross-sectional view of FIG. 2 viewed from the side. In FIG.
Reference numeral 1 denotes, for example, a lower case formed by molding resin, which constitutes a housing H together with an upper case 14 described later, and the motor 2 is mounted in the housing H. The position of the motor 2 is fixed by a motor positioning protrusion 3 formed on the lower case 1. A worm gear 5 is fitted on the output shaft 4 of the motor 2, and the output shaft 4 and the worm gear 5 form an 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 section 6 to the first gear 7, and finally through the second and third gears 8 and 9 to finally output the output gear 10.
Is converted into a predetermined power 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. , A space formed by the butting part 11 and the housing
Is provided, and the leaf spring 12 formed in a curved shape is arranged in the space a as shown in FIG. The abutting portion 11 may be formed so as to have elasticity, for example, by integrally molding with the lower case 1 forming the housing and thinning the thickness of the portion where the tip end of the output portion 6 abuts. it can. Reference numeral 14 in the figure denotes an upper case made of resin or the like.
2 does not fall out.

According to this structure, the tip end of the output portion 6 of the motor 2 comes into contact with the inclined surface 11a of the abutting portion 11, so that the force F shown by the arrow in FIG. 2 is exerted. This force F is the thrust force F of the motor 2.
1. The force F2 in the radial direction is decomposed into the respective components, and the rattling of the motor 2 in the thrust direction can be suppressed by the action of this force F1. Since it works, it is possible to suppress rattling in the radial direction. Further, if the leaf spring 12 is arranged in the space a as described above, the leaf spring 12 is surrounded by the housing and the abutting portion 11, and the position is fixed by the inner walls thereof. The lateral shift can be prevented. Moreover, as compared with the case where the output portion 6 is biased only by the elastic force of the abutting portion 11, the variation in the biasing force due to the influence of the thickness of the abutting portion 11 can be reduced, and the thickness of the abutting portion 11 can be made severe. There is no need to manage, and a stable bias can be obtained.

Since the force F can be easily adjusted by arbitrarily changing the inclination angle of the inclined surface 11a, an appropriate 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 geared actuator is not required.
The data can be simplified.

[0012]

[Second Embodiment] FIG. 4 is a cross-sectional view of essential parts of a geared actuator according to a second embodiment of the present invention when viewed from the side. In FIG. 4, a coil spring 13 is arranged in the space a instead of the leaf spring 12, and other configurations are similar to those of the first embodiment described above. With such a configuration, it is possible to suppress the rattling of the motor 2 in the thrust direction and the radial direction.

[0013]

[Third Embodiment] FIG. 5 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. 5, the worm gear 5 is inserted so that the output shaft 4 can be fitted therethrough, 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 resin abutting portion integrally formed from the resin housing with which the tip of the output portion abuts is inclined, and the abutting portion By arranging the elastic member in the space composed of the housing, it is possible to reduce variations in biasing force due to the influence of the wall thickness of the abutting part, and to stabilize the thickness of the abutting part without strict control. Rattling of the motor in the thrust direction and the radial direction can be suppressed by the urging force, and since the abutting portion is made of resin, abrasion of the tip portion can also be prevented. Further, since the elastic member is surrounded by the housing composed of the lower case and the upper case and the abutting portion and the position is fixed by the inner walls thereof, the elastic member does not come off even if there is a shock such as a drop.

[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 a cross-sectional view when FIG. 2 is viewed from the side.

FIG. 4 is a sectional view of an essential part of a geared actuator according to a second embodiment of the present invention when viewed from the side.

FIG. 5 is a plan view showing the structure of a geared actuator according to a third embodiment of the present invention.

FIG. 6 is a plan view showing a configuration of a conventional geared actuator.

[Explanation of symbols]

1,21 ... Lower case 2, 22 ... Motor 4, 24 Output shaft 5, 25 ... Worm gear 6,26 ... Output section 11 ... Butting part 11a ... Inclined surface 12 ... Leaf spring 13 ... Coil spring 14 upper case a ... space

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Claims (3)

(57) [Claims] 1. A lower case (1) and an upper case (14) are provided.
The resin housing (H), the output shaft (4) and the gear
(5) formed by arranging an output of the geared motor <br/> motor (2) having a (6), a motor positioning formed in the housing
Stores via the fit projection (3), an output gear which operates in response and the output unit in order to supply in conjunction with the output of the geared <br/> motor to an external device a predetermined power (10) The case
And place the geared motor so that the tip of the output unit is
Assembled so that it is pressed against the abutting part arranged on the housing
In the geared actuator, the abutting portion is integrally formed from the lower case (1) of the resin housing.
Launched made fat, tip of at least the output portion together with the tilting of the abutting surface, the abutting portion (1
1) and arranged resilient members (12, 13) in a space configured out with lower case (1) of the housing (H), the elastic
The member covers the upper case (14) of the resin housing.
A geared actuator that is prevented from coming off by being removed . 2. The geared actuator according to claim 1, wherein the elastic member is a curved plate spring. 3. The geared actuator according to claim 1, wherein the elastic member is a coil spring.