JPH08140306A - Geared actuator - Google Patents

Abstract

PURPOSE: To provide an extremely good geared actuator by which an improvement on the side of a motor is not required and in which contact sound and vibration generated at the motor itself are prevented by a simple constitution. CONSTITUTION: A geared actuator is provided with a motor 2 mounted on a housing 1, with an output part 6 formed at the motor 2 in order to transmit the power of the motor and with an output gear 10 installed at the housing 1 to supply a prescribed power to an external apparatus so as to be interlocked with the output part 6. In the geared actuator, a side pressure adding means 11 provided with elasticity is installed at a part of the housing 1, and the output part 6 is biased in its radial direction by the side-pressure addition means 11 so as to restrain an output shaft 4 and a bearing from being rattled.

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 1 denotes a resin molded housing, and a motor 2 is mounted on the housing 1. This motor 2 is provided with a motor positioning protrusion 3 formed on the housing 1,
Its position is fixed. A worm gear 5 is attached to the output shaft 4 of the motor 2,
The output portion 6 of the motor 2 is formed by the output shaft 4 and the worm gear 5.
Is composed.

Reference numeral 7 is a first gear, and the first gear 7 is mounted so as to mesh with and interlock with the worm gear 5. The power of the motor 2 is transmitted from the output section 6 to the first gear 7, and further the second and third gears 8,
The output gear 10 finally converts the power into a predetermined power via 9 and supplies the power to an external device.

[0004]

However, in general,
The motor 2 has a clearance between the output shaft 4 and the bearing, and this clearance causes contact noise and vibration in the motor itself when the motor is driven. It had an effect on the device equipped with. In order to solve this on the motor side, the clearance between the shaft and the bearing must be minimized, which is difficult in terms of productivity or cost.

Therefore, the present invention solves the above problems and prevents contact noises and vibrations generated in the motor itself with a simple structure without requiring improvement of the motor, thereby achieving a very good geared. To provide an actuator.

[0006]

A geared actuator according to the present invention comprises a motor mounted on a housing, an output portion provided on the motor for transmitting power of the motor, and an output portion provided on the housing. In a geared actuator having an output gear that supplies a predetermined power to an external device in conjunction with a section, a part of the housing is provided with elastic side pressure adding means, and the side pressure adding means causes the output section to have a diameter It is designed to be biased in the direction. It is preferable that the lateral pressure applying means is brought into contact with the lateral side of the output portion. Further, the side pressure applying means may be brought into contact with the lower side of the output portion.

[0007]

If the side pressure applying means having elasticity is provided in a part of the housing and the output part is biased in the radial direction by the side pressure applying means, rattling between the output shaft and the bearing can be suppressed. You can

[0008]

[First Embodiment] FIG. 1 is a main plan view of a geared actuator showing a first embodiment of the present invention. Also,
FIG. 2 is a main side view of FIG. In FIG.
Reference numeral 1 denotes a housing made of resin, for example, 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 attached to 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.

Reference numeral 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 further the second and third gears 8,
The output gear 10 finally converts the power into a predetermined power via 9 and supplies the power 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 lateral pressure applying means 11 is brought into contact with the side of the output portion 6 of the motor 2. This lateral pressure adding means 11
Has elasticity, and is, for example, formed so as to stand up integrally with the housing as shown in FIG. In addition to this, for example, when the housing itself does not have elasticity, the lateral pressure applying means may be configured as a member different from the housing. However, even in that case, the separate member is required to have elasticity. Then, as shown in FIG. 2, the lateral pressure applying means 11 is arranged so as to contact the end portion of the worm gear 5 so as to bias the output portion 6 in its radial direction by its own elastic force. With this configuration, the output shaft 4 is always kept in contact with the bearing, and rattling between the output shaft 4 and the bearing is suppressed.

[0011]

[Second Embodiment] FIG. 3 is a main side view of a geared actuator showing a second embodiment of the present invention. 3, the same parts as those in FIG. 2 are denoted by the same reference numerals. In FIG. 3, instead of applying lateral pressure to the output unit 6 in the left-right direction as in FIG. 2, lateral pressure is applied in the vertical direction. Even in this case, it is possible to suppress the backlash between the output shaft 4 and the bearing.

[0012]

[Third Embodiment] FIG. 4 is a principal plan view of a geared actuator showing a third embodiment of the present invention. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals. In FIG. 4, the output shaft 4 is projected from the worm gear 5, and the lateral pressure applying means 11 is arranged so as to contact the end of the output shaft 4. In this way, rattling between the output shaft 4 and the bearing can be suppressed. Although the output shaft 4 and the worm gear 5 are configured as the output portion 6 of the motor in each of the above-described embodiments, the present invention is not limited to this, and a screw groove may be directly formed on 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 the present invention is to provide a means for applying a lateral pressure to this part.

[0013]

As described above, according to the present invention, the side pressure applying means having elasticity is provided in a part of the housing, and the side pressure applying means urges the output portion in the radial direction thereof. By doing so, it is possible to suppress rattling caused by the clearance between the output shaft and the bearing, and it is possible to provide a good geared actuator by preventing the contact noise and vibration generated by the rattling. Moreover, with this configuration, it is possible to provide an inexpensive geared actuator without the need to make a strict design change on the motor side. Further, since the side pressure adding means is only brought into contact with the side or the lower side of the output portion, it is possible to apply an appropriate side pressure with a very simple structure.

[0014]

[Brief description of drawings]

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

FIG. 2 is a main side view of FIG.

FIG. 3 is a main side view of a geared actuator showing a second embodiment of the present invention.

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

FIG. 5 is a main plan view of a conventional geared actuator.

[Explanation of symbols]

 1 ... Housing 2 ... Motor 4 ... Output shaft 6 ... Output section 10 ... Output gear 11 ... Side pressure adding means

Claims (3)

[Claims] 1. A motor mounted in a housing, an output part provided in the motor for transmitting power of the motor, and a predetermined power provided in the housing in cooperation with the output part to an external device. In a geared actuator having an output gear for supplying to the output gear, elastic side pressure applying means is provided in a part of the housing, and the output part is biased in the radial direction by the side pressure applying means. And geared actuator. 2. The geared actuator according to claim 1, wherein the side pressure applying means is brought into contact with a side of the output portion. 3. The geared actuator according to claim 1, wherein the lateral pressure applying means is brought into contact with a lower portion of the output portion.