JPH09172750A - Waterproof structure of electric rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the immersion of water into an electric rotating machine, regardless of the severeness of condition of flooding from outside, by providing a ventilation port leading to a bag-shaped yoke and its opening, and covering the ventilation port with a waterproof filter provided with water repellency and permeability. SOLUTION: A ventilation port 1b is provided in the vicinity of the opening of a yoke 1 which is made in bag shape, with its one end open. A holder 4 is attached to the pipe part 3a of a waterproof cover 3 made of rubber consisting of elastic material covering the opening of the yoke 1, and it is arranged so that it may pass steam being gas and that it may not pass water being liquid. That is, the waterproof filter 4a consisting of gore tex material having water repellency and permeability is attached to a ventilation port 1b in such a way as to cover it. Hereby, immersion of water into an electric rotating machine can be prevented, regardless of severeness of the condition of flooding from outside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a rotary electric machine such as an electric motor or a generator mounted on a vehicle electrical component.

[0002]

2. Description of the Related Art FIG.
It is a partial cross section figure of the conventional rotary electric machine shown by the 2nd publication. In the figure, 1 is a cylindrical yoke formed with one end open, 1a is a drain hole provided near the opening of the yoke 1, and 2 is a circle attached to the yoke 1 to support the shaft end of the rotor. The plate-shaped bracket 3 is a rubber waterproof cover that covers the entire opening of the yoke 1 to prevent water from entering from the mating surface of the yoke 1 and the bracket 2. The waterproof cover 3 is brought into close contact with the yoke 1 by the elasticity of rubber, and a drain pipe portion 3a is provided below the waterproof cover 3 for draining water generated by the infiltration and dew condensation inside the rotating electric machine. When water was submerged and dew was formed, water was naturally drained through the drain pipe portion 3a.

[0003]

Since the conventional waterproof structure of the rotating electric machine is constructed as described above, if the water is severely hit from directly below, such as direct hit water, the water drain provided on the waterproof cover 3 will be removed. There is a problem that it is difficult to prevent water from entering through the pipe portion 3a.

The present invention has been made to solve the above problems, and can prevent water from entering the inside of a rotating electric machine regardless of the severity of the condition of being exposed to water from the outside, and can also cause dew condensation. It is an object of the present invention to provide a waterproof structure for a rotating electric machine that makes it difficult to remove the water and that can be discharged outside even if dew condensation occurs.

[0005]

A waterproof structure for a rotary electric machine according to claim 1 of the present invention comprises a bag-shaped yoke having an opening formed at one end, and a waterproof cover made of an elastic material for covering the opening. In the rotary electric machine, a vent hole communicating with the yoke and the opening is provided, and the vent hole is covered with a waterproof filter having water repellency and air permeability to prevent intrusion of water from the outside and to prevent the inside of the rotary electric machine. Condensation is less likely to occur, and even if it does occur, it is discharged as water vapor through a waterproof filter to the outside.

According to a second aspect of the present invention, there is provided a waterproof structure for a rotating electric machine, wherein the yoke or the bracket is provided with a ventilation hole, and the ventilation hole is made water repellent. By covering with a waterproof filter having air permeability, water is prevented from entering from the outside to prevent dew condensation, and even if dew condensation occurs, it is discharged as water vapor through the waterproof filter to the outside.

In the waterproof structure for a rotating electric machine according to claim 3 of the present invention, the waterproof cover is provided with a pipe portion for allowing water vapor to escape to the outside air, and the pipe portion is provided with a labyrinth structure, so that direct water hits the waterproof filter directly. Prevent that.

In the waterproof structure for a rotating electric machine according to claim 4 of the present invention, a plurality of ventilation holes are provided, and a waterproof filter is provided in each ventilation hole, so that all of the plurality of waterproof filters can be covered with a water film. As a result, dew condensation is less likely to occur, and even if dew condensation occurs, the function of discharging it as water vapor to the outside through the waterproof filter is not completely lost when it is directly hit by water.

In the waterproof structure for a rotating electric machine according to claim 5 of the present invention, the waterproof filter is formed in a bag shape and is covered with the ventilation hole, so that the waterproof filter can be easily attached.

According to a sixth aspect of the present invention, there is provided a waterproof structure for a rotating electric machine, wherein the grommet for pulling out a harness is provided with a ventilation hole, and the ventilation hole is repelled. By covering with a water-proof and air-permeable waterproof filter, intrusion of water from the outside is prevented, dew condensation is less likely to occur, and even if dew condensation occurs, it is discharged as water vapor to the outside through the waterproof filter.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. An embodiment of the present invention will be described below with reference to the drawings. The same reference numerals indicate the same or corresponding parts, and the description thereof will be omitted. In FIG. 1, 1 is a yoke formed in a bag shape with one end open, 1b is a ventilation hole provided near the opening of the yoke, 2 is attached to the yoke 1, and both axial ends of the rotor are supported together with the yoke. The disk-shaped bracket 3 is made of an elastic material that covers the opening of the yoke 1 to prevent water from entering from the mating surface of the yoke 1 and the bracket 2, for example, a waterproof cover made of rubber, and 4 is a waterproof cover 3. A holder attached to the pipe part 3a, through which water vapor as a gas is passed but water as a liquid is not passed, that is, water-repellent and air-permeable, for example, from Gore-tex material (registered trademark) manufactured by Japan GORE-TEX The waterproof filter 4a is formed so as to cover the passage.

The operation of the waterproof structure of the rotating electric machine according to this embodiment will be described with reference to the drawings. Even if the pipe section 3a receives direct hit water from below the waterproof cover 3, and the direct hit water passes through the passage 3b of the pipe section 3a, the direct hit water is blocked because the waterproof filter 4a and the holder 4 block the passage. Water is prevented from entering the rotating electric machine. The waterproof cover 3 is
The space between the yoke 1 and the waterproof cover 3 is waterproofed by the elasticity of rubber. Further, the pipe portion 3a of the waterproof cover prevents the stone from directly hitting the waterproof filter 4a even if the stone hits the pipe portion 3a due to, for example, a stone bouncing by the tire of the vehicle, and when the stone is repelled, the elasticity of the rubber causes the original stone. Return to shape.
In addition, when only the air permeability is used, the water film loses the air permeability when it gets wet, but the water repellency also prevents water from seeping into the waterproof filter 4a even when it gets wet. The water is repelled in the form of water droplets, and the repelled part is breathable. Furthermore, when the rotating electric machine is flooded, especially when the rotating electric machine is operating, the temperature rises abruptly and the temperature inside the rotating electric machine suddenly drops. The state is such that the pressure, temperature, and humidity are in the same state as the atmosphere through the ventilator 1b and the waterproof filter 4a having a function of passing gas, so that the water absorbing action inside the rotating electric machine is prevented, Makes condensation less likely to occur.

Further, even if dew condensation occurs, the heat generation of the rotating electric machine or the like causes water vapor to form the vent hole 1b and the waterproof filter 4a.
Is discharged to the outside through. The required area of the waterproof filter 4a is determined in consideration of the material and area of the waterproof filter 4a, the pressure difference between the inside and the outside, the water vapor temperature, and the degree of contamination of the waterproof filter 4a.

Embodiment 2 FIG. FIG. 2 shows another embodiment of the present invention, in which the open end is directly closed by a bracket. Reference numeral 1c denotes a neck portion formed on the outer periphery of the ventilation hole 1b of the yoke 1, and 4b denotes a waterproof filter formed of, for example, the above-mentioned Gore-Tex material (registered trademark) in a bag shape,
Reference numeral 4c denotes a mouth portion in which a rubber band for attachment is built in this waterproof filter, and 5 denotes a bracket which closes the opening portion of the yoke 1. Here, the yoke 1 is usually made of soft iron to facilitate passage of a DC magnetic flux, but the soft iron has good malleability and can be formed by pressing. According to this embodiment, the waterproof filter 4b and the rubber band 4c, which are the targets of replacement due to stains or damage, are simple and inexpensive. The attachment method is simple because it is sufficient to hook the mouth 4c on the neck 1c and cover the ventilation hole 1b of the yoke 1 with the waterproof filter 4b.

Embodiment 3 FIG. 3 shows another embodiment of the present invention, in which the ventilation hole 1b of the yoke 1 is covered with a waterproof cover 6, and the waterproof filter 6 is further covered with the waterproof filter 4.
It is covered with b. Reference numeral 6 denotes a waterproof cover which covers the ventilation hole 1b of the yoke 1, and 6a denotes a neck portion formed on the outer periphery of the waterproof cover 6. 4b is the same material as shown in FIG. 2,
The waterproof filter 4b has the same shape. Therefore, as in the second embodiment, if the mouth portion 4c is hooked on the neck portion 6a so that the ventilation hole 1b of the yoke 1 is covered with the waterproof filter 4b, water pressure is not excessively applied, and stones do not fly, for example, stationary. For use, water is prevented from entering from the outside and condensation is less likely to occur, and even if condensation occurs, it is effective in discharging it as water vapor to the outside through a waterproof filter. Furthermore, the structure is simple, and the waterproof filter 4
Installation work of b is also easy. The vent hole 1b and the neck portion 1 of the yoke 1 shown in FIG.
This embodiment is effective when it is difficult to form the shape of c.

Embodiment 4 FIG. 4 shows another embodiment of the present invention, in which the waterproof cover 6 is directly provided on the ventilation hole 1b of the yoke 1. Also, this waterproof cover 6
A labyrinth structure 3c is formed by providing a wall in the passage 3b of the pipe portion 3a. This labyrinth structure 3c has the effect of mitigating the force of direct hitting water and preventing the intrusion of dust, and can more effectively prevent damage and clogging of the waterproof filter 4a.
It is possible to further improve the reliability of the rotating electrical machine with respect to waterproofness. The labyrinth structure 3c is not formed integrally with the pipe portion 3a but is formed separately, and
It may be fixed by inserting it into a. When periodic maintenance is required due to clogging as described above, if it is configured such that it can be attached and detached in maintenance units, replacement is facilitated and maintainability is improved.

As the material of the labyrinth structure 3c, rubber is used as in the pipe portion 3a in the fourth embodiment, but resin or metal may be used. Furthermore, since the water directly hit by the waterproof filter 4a and the holder 4 is blocked, the labyrinth structure is not required to have a watertight structure.

Embodiment 5 FIG. 5 shows another embodiment of the present invention, in which a waterproof cover 6 having no pipe portion is provided.
An embodiment using is shown. In FIG. 5, reference numeral 8 is, for example, a metal mesh filter, which is incorporated to protect the waterproof filter 4a from being easily broken. Waterproof cover 6
Are provided at an angle of 90 degrees. When the waterproof filter 4a is completely submerged in water, the dewed water cannot be discharged to the outside as water vapor even though the ingress of water can be prevented. If any one of the waterproof covers 6 is not submerged when the waterproof covers 6 are splashed with water, the function of the waterproof filter 4a incorporated therein is secured. Since the angle and the position of the attached filter surface are changed, the possibility that all the waterproof covers 6 will be splashed with water at the same time to be in a submerged state is extremely small unless the rotating electric machine body is submerged.
Therefore, in this embodiment, the reliability is higher than that in the case where the waterproof filter 4a is one. When the waterproof filter 4a does not have a pipe portion, it is not always necessary to mount the waterproof filter 4a directly below when installing the main body, so that the restriction on the mounting position is reduced. In addition, since there is no pipe portion protruding from the main body, it is compact, and there are few restrictions on the mounting direction, so it is easy to place and has excellent workability. Furthermore, since the waterproof filter is covered with the metal mesh filter, the physical strength is high. If more strength is required, punching metal may be used instead of the mesh filter.

Although the rubber waterproof cover 6 to which the waterproof filter 4a is attached is used here, the material of the waterproof filter 4a may be resin or metal instead of rubber as long as it can be attached in a waterproof manner. Good. Further, the structure of the waterproof filter 4a may be integrally formed, or may be a structure in which the ventilation hole 1b is threaded and screwed into the ventilation hole 1b.

Embodiment 6 FIG. 6 shows another embodiment of the present invention, in which an attachment frame is used instead of the pipe portion. In FIG. 6, 7a,
Reference numeral 7b is a bracket for blocking the yoke 1 from both sides and waterproofing, 9 is a mounting frame integrally molded with the mesh filter 8 with resin in accordance with the curvature of the outer peripheral surface of the yoke 1, and 10a is fixing the mounting frame 9 to the yoke 1. Setscrews 10b are provided on the yoke 1.
A screw hole for a, 11 is, for example, a rubber packing for waterproofing between the waterproof filter 4a and the yoke 1. In this embodiment, since the waterproof filter 4a is oval and long, it forms a curved surface along the circumference of the yoke 1, and both ends thereof are equivalent to changing the filter surface angle and position according to the embodiment of FIG. It will be. That is, when water is splashed on a part of the waterproof filter 4a, a portion where the water is not splashed is generated and the function of the waterproof filter 4a is secured. The possibility that water will be splashed on all parts of the waterproof filter 4a at the same time is very small unless it is submerged. Therefore, reliability becomes high.

Further, since it is not always necessary to mount the main body directly below when the main body is installed, restrictions on the mounting position are reduced.
In addition, since there is no pipe portion protruding from the main body, it is compact, and there are few restrictions on the mounting direction, so it is easy to place and has excellent workability.

Although the molding resin is used for the mounting frame 9 here, the waterproof filter 4a may be made of metal instead of resin as long as the waterproof filter 4a can be mounted in a waterproof manner. If the outer periphery of 4a can be kept airtight, a method other than screwing, such as adhesion, may be used.

Embodiment 7 FIG. 7 shows another embodiment of the present invention, in which the mounting frame is mounted on a bracket. In FIG. 7, as in FIG. 6, 7a and 7b are brackets that block the yoke 1 from both sides and are waterproof, and part of the side surfaces are formed flat. A ventilation hole 7c is opened in this plane, and the ventilation hole 7c
A mounting frame 9 formed integrally with the mesh filter 8 with a resin so as to cover c, sandwiches the waterproof filter 4a and the rubber packing 11 therebetween, and sets screws 10a on the yoke 1.
It is screwed by. In this embodiment, since the mounting surface of the bracket 7b is a flat surface, the mounting frame 9 can be configured to be a flat surface, and it is easy to maintain the working accuracy of the frame 9 and the mounting surface accuracy of the bracket 7b, and the waterproof property is good. Although a plurality of waterproof filters 4a are provided, the filter surface angles are the same. The mounting of the bracket 7b is also easy because it is mounted on a flat surface.

Embodiment 8 FIG. FIG. 8 shows another embodiment of the present invention, in which the waterproof filter 4a is deformed to increase its area and is provided at a position where the cooling air of the coil circulating inside the rotating electric machine is well hit. In FIG. 8, 4
b is a water-repellent and breathable waterproof filter formed in a bag shape, 4c is a rubber band, 12 is a wire band for fixing the waterproof filter 4b, and 13 is easily broken when the waterproof filter 4b is fastened with the wire band 12. A rubber band that protects this and waterproofs between the waterproof filter 4b and the outer surface of the yoke. Further, the ventilation holes 1b are provided with a large number of small diameters corresponding to the area of the waterproof filter 4b. The smaller diameter is due to the external pressure of the waterproof filter 4b.
This is to prevent the touching of the rotating part inside the rotating electric machine. In this embodiment, even if the waterproof filter 4b gets wet with water (for example, even if water droplets such as dew condensation come into contact with the water), a large part of the coil cooling air warmer than the outside air hits the large-area waterproof filter 4b during operation. Therefore, it dries quickly and the function is restored quickly. The circulation air passage in this case may be provided as a bypass (not shown). Further, since the waterproof filter 4b is in the form of a bag, it can be easily constructed in a large area.
Permeability can be secured to the extent that it does not hinder practical use even if it is slightly clogged due to dirt or the like. Further, in this embodiment, since the waterproof filter 4b is flexible and highly flexible in shape, it can be utilized when the size of the rotating electric machine cannot be specified, such as when temporarily rotating the rotating electric machine having a flat outer periphery on the spot.

Embodiment 9 FIG. 9 shows another embodiment of the present invention, in which a grommet 15 for pulling out the harness 14 has a waterproof filter 4a similar to that of the second embodiment.
Is provided with a holder 4 incorporating therein. In FIG. 9, reference numeral 15 is a grommet made of an elastic material such as rubber and having a watertight function, and is sandwiched between the bracket 5 and the yoke 1. Reference numeral 15a is a ventilation hole provided in a grommet communicating with the inside of the rotating electric machine 1, and 4 and 4a are holders and waterproof filters having the same material and shape as those shown in FIG. 1, and the holder 4 covers the ventilation hole 15a. Built into. For applications where water pressure is not applied so much, the atmosphere inside the rotating electric machine is prevented even if the rotating electric machine is exposed to water at a high temperature by preventing water from entering the inside of the rotating electric machine from the outside and the air permeability of the waterproof filter 4a. Since the atmosphere has the same pressure, temperature, and humidity as the atmosphere, the function of absorbing water inside the rotating electric machine is prevented. Further, it has an effect of making it difficult to generate dew condensation and discharging it as water vapor to the outside even if dew condensation occurs. According to this embodiment, the structure is inexpensive only by adding the holder 4 in which the waterproof filter 4a is incorporated, and the physique can be made compact. Further, when there are flying stones, a metal mesh filter or the like may be used to protect the filter, as in the fifth embodiment. In the above embodiment, the holder 4 is provided to fix the waterproof filter 4a.
It is also possible to fix it by insert molding directly on. Further, the grommet 15 may be attached to the yoke 1 or the bracket 5.

Although the present invention has been described above with respect to the waterproof structure of the rotating electric machine mounted on the electrical equipment for the vehicle, the invention is not limited to these, and it can be used for waterproofing for agriculture, ships, aircraft, etc. and for applications where the environmental temperature changes drastically. Applicable if there is a risk of condensation or water.

Further, the shape and mounting method of the waterproof filter can be implemented by various combinations and modifications in accordance with the form of the rotating electric machine as shown in the above-mentioned embodiment.

[0028]

Since the present invention is constructed as described above, it has the following effects.

A waterproof structure for a rotary electric machine according to claim 1 of the present invention is a rotary electric machine having a bag-shaped yoke having an opening formed at one end and a waterproof cover made of an elastic material for covering the opening. Also, since a ventilation hole communicating with the opening is provided and the ventilation hole is covered with a waterproof filter having water repellency and breathability, it is possible to prevent water from entering from the outside and prevent dew condensation inside the rotating electric machine. With
Even if dew condensation occurs, it has the effect of discharging it as water vapor to the outside through a waterproof filter.

According to a second aspect of the present invention, there is provided a waterproof structure for a rotary electric machine, wherein the yoke or the bracket is provided with a ventilation hole, and the ventilation hole is made water repellent. Since it is covered with a waterproof filter having air permeability, it has the effect of preventing water from entering from the outside, making it difficult for dew condensation to occur, and even if dew condensation occurs, it is effective in discharging it as water vapor to the outside through the waterproof filter.

In the waterproof structure for a rotating electric machine according to claim 3 of the present invention, the waterproof cover is provided with a pipe section for allowing water vapor to escape to the outside air, and the pipe section is provided with a labyrinth structure. Therefore, direct hit water first strikes the labyrinth structure. The momentum is slowed down, which has the effect of preventing it from directly hitting the waterproof filter.

In the waterproof structure for a rotating electric machine according to claim 4 of the present invention, a plurality of ventilation holes are provided and a waterproof filter is provided in each ventilation hole, so that all of the plurality of waterproof filters can be covered with a water film. As a result, dew condensation is less likely to occur, and even if dew condensation occurs, the function of discharging it as water vapor to the outside through a waterproof filter is not completely lost when it is directly hit by water. is there.

In the waterproof structure for a rotating electric machine according to claim 5 of the present invention, the waterproof filter is formed in a bag shape and is covered with the ventilation hole, so that the waterproof filter can be easily attached.

In the waterproof structure for a rotating electric machine according to claim 6 of the present invention, since the ventilation hole provided in the grommet is covered with a waterproof filter, the number of additional parts is small, the cost is low, and the size is compact. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view of a rotating electric machine showing a first embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a rotating electric machine showing a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional view of a rotating electric machine showing a third embodiment of the present invention.

FIG. 4 is a partial cross-sectional view of a rotating electric machine showing a fourth embodiment of the present invention.

FIG. 5 is a partial sectional view of a rotary electric machine showing a fifth embodiment of the present invention.

FIG. 6 is a partial sectional view of a rotating electric machine showing a sixth embodiment of the present invention.

FIG. 7 is a partial cross-sectional view of a rotating electric machine showing a seventh embodiment of the present invention.

FIG. 8 is a partial cross-sectional view of a rotating electric machine showing an eighth embodiment of the present invention.

FIG. 9 is a partial cross-sectional view of a rotating electric machine showing a ninth embodiment of the present invention.

FIG. 10 is a partial cross section of a rotary electric machine including a conventional drainage pipe.

[Explanation of reference numerals] 1 yoke 1b ventilation hole 2 bracket 3 waterproof cover 3a pipe part 3c labyrinth structure 4a waterproof filter 4b waterproof filter 5 bracket 6 waterproof cover 7a bracket 7b bracket

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Moritaka Iwamura 8000 Nakase, Hamakita City, Shizuoka Nisshinbo Co., Ltd. Inside Hamakita Seiki Plant

Claims (6)

[Claims] 1. A rotary electric machine having a bag-shaped yoke having an opening formed at one end and a waterproof cover made of an elastic material for covering the opening, wherein a vent hole communicating with the yoke and the opening is provided. A waterproof structure for a rotating electric machine, characterized in that the ventilation hole is configured to be covered with a waterproof filter having water repellency and breathability. 2. A rotary electric machine configured to cover an opening of a yoke with a bracket, wherein the yoke or the bracket is provided with a ventilation hole, and the ventilation hole is covered with a waterproof filter having water repellency and breathability. The waterproof structure of the rotating electric machine. 3. The rotary electric machine according to claim 1, further comprising a pipe portion communicating with the ventilation hole to let water vapor escape to the outside air, and the pipe portion having a labyrinth structure. Waterproof structure. 4. A plurality of vent holes are provided, and a waterproof filter is provided in each vent hole.
The waterproof structure for a rotating electric machine according to any one of 1. 5. The waterproof structure for a rotary electric machine according to claim 1, wherein the waterproof filter is formed in a bag shape and is covered with the ventilation hole. 6. A rotary electric machine configured to cover an opening of a yoke with a bracket, wherein a grommet for harness extraction is attached to at least one of the yoke and the bracket, and a ventilation hole is provided in the grommet.
A waterproof structure for a rotating electric machine, wherein the ventilation hole is covered with a waterproof filter having water repellency and breathability.