JPS6114303Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a reduction motor consisting of a motor and a gear reduction mechanism, and is aimed at reducing noise generated in the gear reduction mechanism.

The embodiment of the present invention shown in FIGS. 1 to 3 will be described in detail below. 1 is a synchronous motor, 2 is a gear box integrally fixed to one side of the motor 1, and 3 is a cover for closing the opening of the box 2. The motor 1 includes a rotor pinion 4 integrally provided with the rotor, and the rotor pinion 4 and the rotor are formed hollow and rotatably fitted into a fixing pin 5. This fixing pin 5 is fixedly erected on the case of the motor 1 and projects into the gear box 2 together with the rotor pinion 4. Further, the free end of the fixing pin 5 is fitted into a hole 6 formed in the center of the cover 3.

Reference numeral 7 designates a gear reduction mechanism built into the gearbox 2, which reduces the rotational speed of the motor 1 to a desired rotational speed and transmits it to the output shaft 8. This gear reduction mechanism 7 consists of a large number of gears (including pinions), and in this embodiment, first, second and third stage gears 9, 10, 11 and first and second stage pinions 1
2 and 13. The above first stage gear 9
and a first stage pinion 12 are integrated and rotatably fitted into a pin 14 fixed between the gear box 2 and the cover 3, and the first stage gear 9 meshes with the rotor pinion 4. Also, the first stage gear 9
is made of synthetic resin, and elastic protrusions 15 are integrally molded on one side thereof at intervals of 120 degrees. Then,
This elastic protrusion 15 comes into elastic contact with the bottom surface of the gear box 2, and applies a thrust load to the first stage gear 9 by its reaction force.

The second stage gear 10 and the second stage pinion 13 are integrated and are rotatably inserted into a pin 16 fixed between the gear box 2 and the cover 3.
The stage gear 10 meshes with the first stage pinion 12.
Further, the third stage gear 11 is fixed to an output shaft 8 rotatably supported by the cover 3 and meshes with the second stage pinion 13.

In the present deceleration motor configured as described above, when the motor 1 is driven, power is transmitted to the output shaft 8 via the gear reduction mechanism 7, and the output shaft 8 rotates at a desired low speed.

On the other hand, as shown in FIGS. 4 and 5, the conventional deceleration motor does not have the elastic protrusion 15 as in the present invention and does not apply a thrust load to the first stage gear 9, so the rotor pinion 4 As will be described later, noise is generated between the first stage gear 9 and the first stage gear 9, and this is a cause of noise in the gear reduction mechanism 7. Generally speaking, it is most ideal for gears to mesh with each other without any play, but in reality, it is essential to have an appropriate amount of play in order to ensure smooth meshing between gears. However, in this state with a moderate play, if the gears run out due to rotation, that is, run out in a pitch circle, the mutual meshing of the gears becomes imbalanced due to the synergistic effect with the above play, and the mutual meshing of the gears becomes uneven. A sound is generated partially due to the misalignment of the gear, and this sound appears periodically as the gear rotates. Such periodic noise appears more strongly in areas closer to the drive source, and in conventional deceleration motors, periodic noise occurs particularly in the meshing area between the rotor pinion 4 and the first stage gear 9. It was hot. Furthermore, when vibrations caused by the drive of the motor 1 are applied to the first stage gear 9, the first stage gear 9
The play in meshing with the rotor pinion 4 causes backlash, which also causes interference noise with the rotor pinion 4.

However, in the case of the deceleration motor of the present invention, by applying a thrust load to the first stage gear 9 using the elastic protrusion 15, the first stage gear 9 becomes a pitched circle as the thrust load becomes a moderate resistance. vibration is suppressed, and the occurrence of periodic noise, which is conventional, is suppressed. Furthermore, the thrust load acts as resistance against the backlash of the first stage gear 9, and interference noise due to the backlash is also eliminated. Therefore, in the present invention, the generation of noise in the gear reduction mechanism 7 can be reduced, and a quiet reduction motor can be provided.

In the above-mentioned embodiment of the present invention, the elastic protrusion 15 is integrally formed on the first stage gear 9 to apply a thrust load. The thrust load may be applied to the first stage gear 9 through the use of an elastic material.In short, any structure may be used as long as the thrust load is applied to the first stage gear 9 using an elastic material.

6 is a cross-sectional view showing the head of an electric fan using the reduction motor of the present invention as an oscillating motor. 21 is a fan motor, 22 is a mounting base, with the fan motor 21 fixed to the top of the front half and the reduction motor, i.e., the oscillating motor M, fixed to the top of the rear half by screws, and a spindle 23 fixed to the bottom of the front half. 24 is a crank fixed to the output shaft 8 of the oscillating motor M, 25 is an oscillating rod connected to the crank 24, 26 is a rear cover attached to the rear end of the mounting base 22 by a screw 27, and 28 is a front cover. When the oscillating motor M is driven, the output shaft 8 rotates at a low speed and is transmitted to the oscillating rod 25 via the crank 24, and the electric fan head reciprocates left and right around the spindle 23 to oscillate.

In the case of such electric fans, if the noise of the oscillating motor is loud at night, especially when going to sleep, it will be harsh on the ears, making it difficult to fall asleep, or for that reason, the oscillating motor may not be used. Because it becomes quieter when used in motors,
This means that the neck vibration motion can be fully utilized without disturbing sleep.

As described above, the proposed reduction motor applies a thrust load to the first stage gear using an elastic material.
Can reduce noise generated in gear reduction mechanisms,
It is quiet and is very suitable for practical use.

[Brief explanation of the drawing]

Figure 1 is a sectional view of the main parts of the proposed reduction motor, Figure 2 is a top view with the cover removed, and Figure 3 is a sectional view of the main parts of the proposed reduction motor.
The figure is a configuration diagram of the first stage gear same as above, Figure 4 is a local sectional view of a conventional reduction motor, Figure 5 is a top view showing the state with the cover removed, and Figure 6 is a swing of the proposed reduction motor. It is a sectional view showing the head of the electric fan used as a motor. 1: Motor, 7: Gear reduction mechanism, 9: First stage gear, 15: Elastic protrusion.

Claims (1)

[Scope of utility model registration request] A reduction motor comprising a motor and a gear reduction mechanism, characterized in that a thrust load is applied to a first stage gear of the gears constituting the gear reduction mechanism using an elastic material.