JPS5852855Y2 - Waterproof structure of motor with fan - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a waterproof structure for a fan-equipped motor in which a fan is attached to the output shaft.

FIG. 1 shows an example of the waterproof structure of a conventional fan-equipped motor, in which a fan boss 2a of a fan 2 is fixed to an output shaft 1a of a motor 1 with a nut 3, thereby configuring the fan-equipped motor.

A ring-shaped rib 2b protruding toward the housing 1b is integrally formed on the motor 1 side of the fan boss 2a.

On the other hand, the housing 1b of the motor 1 is formed with a caulking protrusion 1c (see FIG. 2) that protrudes toward the fan boss 2a. The cap-shaped water shield 5 is inserted into the cap-shaped water shield 5 facing the inner circumferential surface of the cap-shaped water shield 5, and the tip of the caulking projection 1C is caulked.
It is fixed at b.

In this way, a labyrinth effect is obtained by the rib 2b of the fan boss 2a and the cap-shaped water shield 5, preventing water from entering from the outside, and the air pressure inside and outside the motor 1 is reduced by the breathing hole 1d formed in the housing 1b. This eliminates the difference and prevents water from being sucked into the motor 1 due to the pressure difference caused by sudden temperature changes.

However, in the conventional system described above, when the amount of water sprinkled increases to a certain extent, the labyrinth effect is exceeded and the water droplets enter the motor 1 through the breathing hole 1d.
It had the disadvantage of penetrating into the inside of the body.

Further, as shown in the figure, the cap-shaped water shield 5 is caulked and fixed to the housing 1b via the elastic packing 4 using a caulking protrusion 1c formed integrally on the housing 1b. Due to the wall thickness relationship, the height h of the caulking protrusion 1c shown in FIG. Since a curved surface portion is formed in the 0 part, there is a large variation in the gap 1 between the housing 1b surface and the back surface of the cap-shaped water shield 5, and the thickness of the elastic packing 4 is required to allow the elastic packing 4 to breathe. There was a clear problem that there was a need to increase the strength of the system.

The purpose of this invention is to eliminate the drawbacks of the prior art mentioned above,
To provide a waterproof structure for a motor with a fan, which eliminates the need to separately provide a breathing hole for the motor, reduces manufacturing costs, and significantly prevents water droplets from entering the inside of the motor.

In this invention, a plurality of caulking holes that also serve as breathing holes are formed in the motor housing, and a plurality of claws formed in a cap-shaped water shield arranged concentrically with the fan boss are used to connect at least the caulking holes. It is inserted into the caulking hole through a through hole provided in an elastic packing large enough to close it, and with the cap-shaped water shield in close contact with the housing surface via the elastic packing, the claw portion is inserted. It is characterized in that it is bent and locked on the inner surface of the housing, and the tip opening edge of the cap-shaped water shield faces the inner circumferential surface of a ring-shaped lip formed on the motor side of the fan boss.

Hereinafter, embodiments of this invention will be described in detail based on the drawings.

3 to 5 show an embodiment of this invention, in which a fan boss 12a of the soan 12 is connected to the output shaft 11a of the motor 11.
is fixed with a nut 13 to constitute a motor with a fan.

A ring-shaped lip 12b that protrudes toward the housing 11b of the motor 11 is integrally formed on the motor 11 side of the fan boss 12a.

On the other hand, on the side surface of the housing 11b of the motor 11, that is, on the fan 12 side, there are a plurality of caulking holes 11c that also serve as breathing holes.
A cap-shaped water shield 15 arranged concentrically with the fan boss 12a can be attached through the caulking hole 11c.

That is, the back side of the cap-shaped water shield 15 has a plurality of claws 15a corresponding to the caulking holes 11e, and an elastic packing 14 having a size that can at least close the caulking holes 11c is attached to the cap-shaped water shield 15. The cap-shaped water shield 15 is interposed between the water shield 15 and the housing 11b, and the claw portion 15a is inserted into the caulking hole 11c through the through hole 14a provided in the elastic packing 14. With the claw portion 15a in close contact with the surface of the housing 11b via the elastic gasket 14, the claw portion 15a is held on the inner surface of the housing 11b and
- The housing 11b is bent in the outer diameter direction to fix the cap-shaped water shield 15 to the housing 11b.

Furthermore, a ring-shaped rib 1 is formed in which the tip opening edge of the cap-shaped water shield 15 is formed on the motor side of the fan boss 12a.
2b, so as to create a labyrinth effect and prevent the water bottle from entering.

Also, a through hole 14g formed in the elastic packing 14
is made slightly thicker than the claw portion 15a formed on the cap-shaped water shield 15, so that a slight gap 116 is formed as shown in FIGS. 4 and 5.

Furthermore, a caulking hole 11 ct formed in the housing 11b
rl is formed to be thicker than the claw portion 15a> and the through hole 14a of the elastic packing 14 so that it can also serve as a breathing hole, and the elastic packing 14 is formed to be thicker than the through hole 14a of the elastic packing 14.
The caulking hole 11 has a larger area than the opening area of 1c.
It is possible to block c.

Then, after inserting the claw part 15a of the cap-shaped water shield 15 into the caulking hole 11c through the through-hole 14a of the elastic packing 14, the claw part 15a is... It is bent and fixed.

Therefore, concentricity between the cap-shaped water shield 15 and the output shaft 11a is achieved at the outer peripheral portion of the claw portion 15a.

For this reason, a plurality of caulking holes 11 clrl housing 11
It is preferable that the plurality of claws 15a corresponding to the caulking holes 11c are also formed concentrically on the back surface of the cap-shaped water cover 15.

Here, the elastic packing 14 has two functions.

One of these is a seal function that prevents water from entering between the cap-type water cover 15 and the housing 11b on the outer periphery of the cap-type water cover 15, and the other is a seal function as a valve body. It is a function.

That is, as shown in FIG.
The claw portion 15a formed in and the through hole 1 of the elastic packing 14
A small gap 116 is formed between the motor 11 and the motor 11, and the existence of this gap 16 eliminates the extremely small pressure difference between the inside and outside of the motor 11, and prevents water droplets from passing through.

When a large pressure difference occurs between the inside and outside of the motor 11, the gap 116 increases by the necessary minimum amount due to the deformation of the elastic packing 14, and when the pressure difference disappears, the gap 116 increases by the necessary minimum amount.
becomes smaller again.

For this reason, the time required to eliminate the pressure difference is shorter than when a small breathing hole (breathing hole 1d in Figure 1) made of a conventional rigid body is provided, and water droplets enter the interior through the breathing hole (squeezing hole). The chance of infiltration can be significantly reduced.

In other words, it can be said that the protection performance against water droplets of the breathing hole for reducing the pressure difference between the inside and outside of the motor is extremely superior compared to the case where a conventional rigid breathing hole is provided.

As is clear from the detailed explanation above, according to this invention, there is no need to separately form a breathing hole in the motor housing, so the manufacturing cost of the housing can be reduced. An elastic packing is interposed between the elastic packing and the through hole for inserting the water shield claw provided in the elastic packing serves as the valve body of the breathing hole. It is possible to prevent this very effectively by the expansion and contraction of the body, and by making the crimping hole of the claw portion also serve as a breathing hole, the crimping hole can be enlarged, improving the workability of the crimping hole and The ease of assembling the parts has been significantly improved, and the cap-shaped water shield can be easily fixed to the housing by bending its claws at the portions passing through the caulking holes. It has very good effects such as being able to freely select the wall thickness.

[Brief explanation of drawings]

Figure 1 is a partial longitudinal sectional view of a conventional motor with a fan, Figure 2
The figure is an enlarged cross-sectional view of the caulking protrusion in Figure 1, Figure 3 is a partial vertical cross-sectional view of a fan-equipped motor according to an embodiment of this invention, and Figure 4 is an illustration of the cap-shaped water shield shown in Figure 3. FIG. 5 is an enlarged sectional view of the tightening portion, and is an explanatory view taken along the line A--A in FIG. 4.

Claims (1)

[Scope of utility model registration request] In a fan-equipped motor with a fan attached to the output shaft, a plurality of caulking holes that also serve as breathing holes are formed in the nozzle of the motor, and a cap-shaped water shield is formed concentrically with the fan boss. A plurality of claws are inserted into the crimping hole through through holes provided in an elastic packing having a size that can close at least the crimping hole, and the cap-shaped water guard is inserted through the elastic packing. - The inner periphery of a ring-shaped lip in which the claw portion is bent and locked on the inner surface of the housing while in close contact with the housing surface, and the tip opening edge of the cap-shaped water shield is formed on the motor side of the fan boss. A waterproof structure for a motor with a fan that is characterized by facing the surface.