JPH0715321Y2 - Draining equipment for rotating electric machines - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a drainage device for a rotary electric machine such as an electric motor or a generator.

[Conventional technology]

Generally, in rotary electric machines such as electric motors and generators, a drain hole is formed in the lower part of the housing in order to prevent water from accumulating inside the machine due to dew condensation or the like.

However, for example, in a starter motor mounted on a vehicle such as an automobile or a motorcycle, the lower part of the housing may be exposed to water. However, there are problems such as corrosion of the conductive portion and poor lubrication of the moving portion.

Therefore, conventionally, in this type of rotary electric machine, a water draining device in which a pipe such as a rubber tube is connected to a water draining hole formed in the lower portion of the housing is used as a means for preventing water intrusion.

Also, simply attaching a tube such as a rubber tube to the water drainage hole has a low effect of preventing water intrusion, so
As described in Japanese Patent Publication No. 62-2905 and Japanese Utility Model Publication No. 62-2906, a labyrinth is formed by projecting a plurality of baffle plates in the middle of the pipe leaving a water passage.
Technology to effectively prevent infiltration of water by this maze,
Is proposed.

[Problems to be solved by the device]

However, when a baffle plate is formed in the middle of the rubber tube, the baffle plate is formed by the so-called force-relief molding method by utilizing the flexibility of the rubber material during resin molding of the rubber tube. The overlap margin of cannot be set to a large value. As a result, the effect of preventing water from entering due to the baffle is limited.

An object of the present invention is to provide a water draining device for a rotary electric machine that can set the overlap margin of the baffle plate sufficiently large.

[Means for Solving the Problems]

The water drainage device for a rotary electric machine according to the present invention is provided with a water drainage hole (23) in the lower part of the housing (11), and a water intrusion prevention means is attached to the water drainage hole (23). In a drainage device for a rotary electric machine, a front opening (27) and a bottom opening (28) are located at the position of the outlet (24) of the drainage hole (23) in the housing (11).
The drain cover mounting groove (26) having the
4) The sink cover is recessed so as to communicate with 4), and the left and right side walls of the drain cover mounting groove (26) have a captive prevention groove (29) extending in the front-rear direction and a pull-out groove extending in the vertical direction. The stop groove (30) is formed respectively, and the drain cover mounting groove (26) has a channel-shaped steel-shaped drain cover (31) which fits into the mounting groove.
The hollow part (33) is fitted so as to communicate with the outlet (24) and closes the front opening (27), and the left and right side walls (34) of the drain cover (31) are also fitted. , (35) and the retaining claws (39) projectingly provided on the outer surfaces of the retaining holes (35), respectively.
And the side walls (34) and (35) on the left and right sides of the drain cover (31), which are fitted in the retaining groove (30).
At least a pair of baffles (36) and (37) are vertically displaced on the inner surface of the so that the tips of the left and right baffles (36) and (37) are inwardly directed so that they overlap each other. It is characterized by being projected.

[Action]

In the above-mentioned means, water generated in the housing (11) due to the dew point phenomenon or the like is discharged from the outlet (24) of the drain hole (23) into the drain cover mounting groove (26), and the drain cover (3).
The surface of the baffle plates (36) and (37) in the hollow part (33) of 1) is made to flow down, and is dropped from the bottom opening (28) of the drain cover (31).

Even if the bottom opening (28) is exposed to water from below the drain cover (31), the baffles (36) and (37) project into the hollow part (33) of the drain cover (31). Since it is installed, water will not reach the drain hole (23). Further, since the tips of the baffles (36) and (37) are overlapped, the effect of preventing water from entering is extremely high.

Then, according to the above-mentioned means, the left and right baffle plates (36),
(37) is the left and right side walls (3
4) and (35) are projected so as to face the other side. Therefore, when the drain cover (31) is formed, the channel steel shape openings are set in the die cutting direction, so that the left and right baffle plates (36). , (37), the overlap margin can be set extremely large. Left and right baffles (36), (3
When the overlap margin of 7) becomes large, the effect of preventing water intrusion becomes extremely large.

The drain cover (31) is a means for fixing the drain cover (31) to the mounting groove (26), the fall prevention portion (38), the fall prevention groove (29), the retaining claw (39) and the retaining groove (30) are the drain cover. Since it is projected on the outer surface of the left and right side walls (34) and (35) of (31), the hollow part (33) of the drain cover (31) which becomes the drainage space can be set large, and The overlap margin of the baffles (36) and (37) can be set large.

〔Example〕

FIG. 1 is a vertical sectional view showing a water draining device for a rotary electric machine according to an embodiment of the present invention, FIG. 2 is a front view including a partial cross section showing a housing, and FIG. 3 is a rear view showing the housing. 4 is an exploded perspective view showing a main part, FIG. 5 is a rear view showing the drain cover, FIG. 6 is a side sectional view showing the drain cover, and FIG. 7 is a bottom view showing the drain cover.

In this embodiment, a drainage device for a rotary electric machine according to the present invention is a motor for driving a hydraulic pump (not shown).
The housing 11, which is used for 10 and contains the rotor of the motor and the like, has a rotor housing chamber 12, bearing housing chambers 13 and 13 ', and an oil sump chamber 14 formed therein. The rotor as the rotating body of the motor 10 is stored in the rotating body storage chamber 12, and the rotating shaft
A bearing 15 is rotatably supported by bearings 16 and 17 in bearing receiving chambers 13 and 13 '. The oil sump chamber 14 is formed so as to be adjacent to the one bearing storage chamber 13, and an oil seal 18 is arranged on the side of the oil sump chamber 14 opposite to the bearing storage chamber 13.
A part of the oil seal 18 is brought into sliding contact with the outer peripheral surface of the rotating shaft 15 so that the oil filled in the oil pump (not shown).
Is configured to be prevented from leaking to the oil sump chamber 14 side through the rotating shaft 15. The housing 11 includes a substantially flat plate-shaped end bracket 19 and a cylindrical yoke 20 having one end opened and the other end closed, and the end bracket 19 closes the opening end side of the yoke 20. And is fixed by a screw member.

Then, the oil sump chamber 14 is provided inside the wall of the end bracket 19.
An oil discharge passage 21 for guiding the oil leaked inward to the outside is formed along the direction in which gravity acts. That is, inside the wall body of the end bracket 19, the upper end of the oil drain passage 21 is opened so as to connect to the lowermost portion of the oil sump chamber 14 from the bearing storage chamber 13 side, and the middle portion thereof extends vertically. The lower end of the pipe is opened vertically downward at the lowest end position on the outer circumference of the end bracket 19.

In addition, a drainage channel 23 as a drainage hole for discharging the water in the rotary body storage chamber 12 to the outside is provided on the end surface of the end bracket 19 exposed to the inside of the rotary body storage chamber 12. That is, the drainage channel 23 is formed at the lowermost end position of the outer peripheral portion of the inner end surface of the end bracket 19 in the shape of a side groove that is recessed so as to extend in the axial direction, and one end of the drainage channel 23 is provided in the rotating body storage chamber 12. The opening is opened in the hollow portion of the yoke 20 forming the, and the other end is opened to the outer periphery of the end bracket 19. The outlet 24 of the drainage channel 23 is arranged so as to be close to the lowest end of the outer circumference of the end bracket 19 together with the outlet 22 of the oil drainage channel 21.

Further, an air passage 25 is formed on the inner peripheral surface of the bearing storage chamber 13 in the end bracket 19 so that the oil discharge passage 21 and the rotating body storage chamber 12 communicate with each other via the oil sump chamber 14. That is, the ventilation passage 25 has a side groove that is recessed so as to extend in the axial direction at the uppermost end position on the inner peripheral surface of the bearing housing chamber 13,
The end wall of the bearing storage chamber 13 is formed with a vertical groove that is recessed so as to hang down from one end of the side wall. It communicates with room 12.

Then, at the position of the end bracket 19 where the outlet 24 of the drainage channel 23 and the outlet 22 of the oil drainage channel 21 are arranged in close proximity to each other, a drain cover mounting groove 26 is formed as a drain cover mounting hole. A drain cover 31 made of plastic is detachably mounted in the drain cover mounting groove 26.

That is, the drain cover mounting groove 26 is the end bracket 19
It is arranged at the center of the lowermost end of the front wall, and is sunk into a substantially square hole having a constant depth, and a front opening 27 and a bottom opening 28 are formed in the front and bottom surfaces thereof, respectively. An outlet 22 of the oil drain passage 21 is provided on the ceiling wall of the drain cover mounting groove 26, and an outlet 24 of the drain passage 23 is provided on the rear wall facing the front opening 27. Further, on the left and right side walls of the drain cover mounting groove 26, a pair of captive prevention grooves 29, 29 are arranged at the upper end portion thereof so as to extend in the front-rear direction, and are cut, respectively, and a pair is provided at the middle portion thereof. The retaining grooves 30, 30 are arranged and cut so as to extend in the vertical direction.

On the other hand, the drain cover 31 is made of resin or the like and integrally formed into a generally channel-shaped steel shape as shown in FIGS. 4 to 6. That is, the drain cover 31 includes a main body 32 whose front shape and depth are formed in a channel shape which fits into the drain cover mounting groove 26, and the hollow portion 33 of the main body 32 has a rear surface, a ceiling surface and a bottom surface which are open. It is supposed to do. Left and right side walls 34 of the main body 32,
A pair of baffle plates 36 and 37 are alternately arranged on the inner surface of 35, and are protruded inward so that the tip ends are slightly lowered. The left and right baffles 36, 37 are formed so that their tip portions overlap each other, and the overlap margin A thereof is set to be 1/2 or more of the length L of the baffles. This overlap cost A is the drain cover body
Since the hollow portions 33 of 32 are opened on the back surface, this direction can be used as the die-cutting direction at the time of molding, so that it can be set extremely large.

Further, on the outer surfaces of the left and right side walls 34, 35 of the main body 32, a pair of captive prevention portions 38, 38 are provided at the upper ends thereof and project outwardly. It is formed so that it can be fitted into the prevention grooves 29, 29, respectively. Further, a pair of retaining claws 39, 39 are provided outwardly at the intermediate portions of the left and right side walls 34, 35, respectively. The retaining claws 39, 39 engage with the retaining grooves 30, 30. Each is formed to obtain.

The drain cover 31 configured in this manner is inserted into the drain cover mounting groove 26 of the end bracket 19 with the drop prevention portion 38 fitted in the drop prevention groove 29 with the opening side facing inward. When the drain cover 31 is inserted all the way into the drain cover mounting groove 26, the retaining claws 39, 39 engage with the retaining grooves 30, 30, respectively, so that the drain cover 31 is fixed in the drain cover mounting groove 26. It will be attached to the.

As described above, the drain cover 31 mounted in the drain cover mounting groove 26 simultaneously covers the outlet 22 of the oil drain passage 21 and the outlet 24 of the drain passage 23 opened in the end bracket 19. In this state, the baffles 36, 37 of the drain cover 31 allow the oil discharged from the outlet 22 and the water discharged from the outlet 24 to flow down while effectively preventing the intrusion of water from below. It has become.

Next, the operation will be described.

When the drain cover 31 is attached, the baffles 36, 37
Since the overlap margin A is set to be extremely large, the effect of preventing water from entering is extremely high.

If oil accumulates in the oil sump chamber 14 due to use of the motor 10 or the like,
This oil is discharged from the outlet 22 via the drain cover 31 by the action of gravity via the oil discharge passage 21. Further, water that has entered the rotary body storage chamber 12 due to dew condensation or the like is drained from the drain cover 31 via the drainage channel 23.

In these oil drainage and drainage actions, the oil sump chamber 14 and the rotating body storage chamber 12 are communicated with each other through the ventilation path 25, and the oil sump chamber is
Since 14 is communicated with the outside air through the oil drain passage 21, even if either the oil drain passage 21 or the drain passage 23 is blocked by water or oil, the pressure and water acting on the oil The pressure acting on is equal to the atmospheric pressure, and the oil can be drained and drained smoothly.

Since the oil draining structure and the water draining structure are integrally formed, both outlets 22 and
24 can be covered at a time, and the cost and the number of assembly steps can be reduced accordingly.

The present invention is not limited to the above embodiment,
It goes without saying that various modifications can be made without departing from the spirit of the invention.

The drain cover mounting hole may just correspond to the outlet of the drainage channel as a drainage hole.

[Effect of device]

As described above, according to the present invention, the left and right baffles (36) and (37) are respectively provided on the left and right side walls (34) and (35) of the channel type steel shape so as to project toward the other side. Therefore, the overlap margin of the left and right baffles (36) and (37) can be set extremely large by setting the channel-shaped steel-shaped opening in the die-cutting direction when the drain cover (31) is formed. Left and right baffles (36),
The larger the overlap margin of (37), the greater the effect of preventing water intrusion.

Further, the fall prevention portion (38) and the fall prevention groove (29) which are means for fixing the drain cover (31) to the mounting groove (26).
Since the retaining claw (39) and the retaining groove (30) are provided on the outer surfaces of the left and right side walls (34) and (35) of the drain cover (31), the drain cover (31 that serves as a drainage space is provided. ) The hollow part (33) can be set large, and
The overlap margin of the left and right baffles (36) and (37) can be set to a large value.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a water draining device for a rotary electric machine according to an embodiment of the present invention, FIG. 2 is a front view including a partial cross section showing a housing, and FIG. 3 is a rear view showing the housing. 4 is an exploded perspective view showing a main part, FIG. 5 is a rear view showing the drain cover, FIG. 6 is a side sectional view showing the drain cover, and FIG. 7 is a bottom view showing the drain cover. 10 …… motor, 11 …… housing, 13 …… bearing storage room,
14 …… Oil sump chamber, 15 …… Rotary shaft, 16,17 …… Bearing, 18 …… Oil seal, 19 …… End bracket, 20 ……
Yoke, 21 ... Oil drainage channel, 22 ... Outlet, 23 ... Drainage channel (drain hole), 24 ... Outlet, 25 ... Ventilation channel, 26 ... Drain cover mounting groove (Drain cover mounting hole), 27 …… Front opening,
28 …… bottom opening, 29 …… fall prevention groove, 30 …… retaining groove, 31 …… drain cover, 32 …… body, 33 …… hollow part,
34, 35 …… Side wall, 36, 37 …… Baffle plate, 38 …… Fall prevention part, 39 …… Prevention claw.

Claims (1)

[Scope of utility model registration request] 1. A drainage hole (23) at the bottom of the housing (11).
In the drainage hole (23) of the rotary electric machine, wherein the water drainage hole (23) is equipped with a means for preventing water intrusion, the outlet (24) of the drainage hole (23) in the housing (11). Front opening (27) and bottom opening (28) at
The drain cover mounting groove (26) having the
4) The sink cover is recessed so as to communicate with 4), and the left and right side walls of the drain cover mounting groove (26) have a captive prevention groove (29) extending in the front-rear direction and a pull-out groove extending in the vertical direction. The stop groove (30) is formed respectively, and the drain cover mounting groove (26) has a channel-shaped steel-shaped drain cover (31) which fits into the mounting groove.
The hollow part (33) is fitted so as to communicate with the outlet (24) and closes the front opening (27), and the left and right side walls (34) of the drain cover (31) are also fitted. , (35) and the retaining claws (39) projectingly provided on the outer surfaces of the retaining holes (35), respectively.
And the side walls (34) and (35) on the left and right sides of the drain cover (31), which are fitted in the retaining groove (30).
At least a pair of baffles (36) and (37) are vertically displaced on the inner surface of the so that the tips of the left and right baffles (36) and (37) are inwardly directed so that they overlap each other. A water draining device for a rotating electric machine, which is characterized by being projected.