JPH0713407Y2 - 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.

On the other hand, in the case of a motor with an oil seal, together with a water draining device that is supposed to be submerged in water, for example, as described in Japanese Utility Model Laid-Open No. Sho 62-198849, oil drainage that assumes oil drainage such as oil seal wear The structure is adopted.

[Problems to be solved by the device]

However, in the case of a motor with an oil seal having a conventional oil draining structure and a water draining structure, each structure is provided independently, and rubber parts and resin parts are not provided for the oil draining structure and the water draining structure. Since it is used for each structure, there is a problem that the cost increases and the number of assembling steps increases.

An object of the present invention is to provide a drainage device for a rotary electric machine that can share a drain cover even if an oil drain passage and a drain passage are provided separately.

[Means for Solving the Problems]

A water draining device for a rotary electric machine according to the present invention includes a housing (11) having a rotating body storage chamber (12) and a bearing storage chamber (13).
The oil storage chamber (14) is formed adjacent to the bearing storage chamber (13), and the rotating body in the rotating body storage chamber (12) is axially supported by the bearing (16) in the bearing storage chamber (13). The oil sump chamber (14)
An oil seal (18), which is in sliding contact with the outer peripheral surface of the rotating shaft (15) of the rotating body, is adjacent to the drainage device of the rotating electric machine, wherein a drain cover is provided at a lower position in the gravity direction of the housing (11). (31) is mounted, and one end is connected to the oil sump chamber (14) and the other end is connected to the drain cover (31) inside the housing (11) to extend in the gravity direction. And a drainage channel (21), one end of which is connected to the rotating body storage chamber (12) and the other end of which is connected to the inside of the drain cover (31), and one end of which is rotated. A ventilation passage (25) is provided which is connected to the body storage chamber (12) and has the other end connected to the oil discharge passage (21) through the oil sump chamber (14). .

[Action]

In the above means, the pressure in the drain cover (31) and the pressure in the rotary body storage chamber (12) even when either the drain passage (21) or the drain passage (23) is closed. Since the state is maintained at the atmospheric pressure by the other one of the oil drainage channel (21) and the drainage channel (23), good oil drainage action and drainage action can be secured.

According to the above-mentioned means, even if the drain passage (21) and the drain passage (23) are opened separately, the drain cover (3
Since the same drain cover (31) can be shared by being connected to each other in (1), it is possible to reduce cost and man-hours for assembly.

〔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 face wall of the bearing storage chamber 13 is composed of a vertical groove that is submerged so as to hang down from one end of the side groove, the lower end of the vertical groove communicates with the oil sump chamber 14, and the inner end of the side groove stores the rotating body. It communicates with room 12.

Then, a drain cover mounting groove 26 is formed at a 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 proximity to each other, and the drain cover mounting groove 26 is provided.
A drain cover 31 made of plastic is detachably mounted in the inside of 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.

In this way, the drain passage 21 opened in the end bracket 19 by the drain cover 31 mounted in the drain cover mounting groove 26.
The outlet 22 and the outlet 24 of the drainage channel 23 will be covered at the same time. 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 Since the pressure acting on is the same as the atmospheric pressure, 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.

For example, the drain cover is not limited to the one having the above configuration.

[Effect of device]

As described above, according to the present invention, the drain passage (21),
Even when either one of the drainage channels (23) is closed, the pressure in the drain cover (31) and the rotary member storage chamber (12).
Since the internal pressure is maintained at the atmospheric pressure by either the drain passage (21) or the drain passage (23), good drainage action and drainage action can be ensured. (2
Even if 1) and the drainage channel (23) are opened separately, the same drain cover (31) can be shared by being connected inside the drain cover (31), thus reducing the cost. And the number of assembly steps can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal 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. Is a rear view showing the housing, FIG. 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 drain cover. It is a bottom view. 10 ... Motor, 11 ... Housing, 13 ... Bearing storage chamber, 14 ... Oil storage chamber, 15 ... Rotating shaft, 16, 17 ... Bearing, 18 ... Oil seal, 19 ... End bracket, 20 ... Yoke, 21 ... Oil discharge passage ,
22 ... Exit, 23 ... Drainage channel (water drainage hole), 24 ... Exit, 25 ... Ventilation channel, 26 ... Drain cover mounting groove, 27 ... Front opening, 28 ... Bottom opening, 29 ... Fall prevention groove, 30 ... Fall prevention Groove, 31 ... Drain cover, 32 ... Main body, 33 ... Hollow part, 34, 35 ... Side wall, 36,
37 ... baffle plate, 38 ... fall prevention part, 39 ... retaining claw.

Claims (1)

[Scope of utility model registration request] Claims: 1. A housing (11) having a rotating body housing chamber (12) and a bearing housing chamber (13) is provided with an oil sump chamber (14) adjacent to the bearing housing chamber (13). Storage room (12)
The rotating body is rotatably supported by the bearing (16) in the bearing housing chamber (13), and the oil sump chamber (14) has an oil seal (18) that is in sliding contact with the outer peripheral surface of the rotating shaft (15) of the rotating body. In the drainage device of an adjacent rotating electric machine, a drain cover (31) is attached to a lower position in the gravity direction of the housing (11), and one end of the drain cover (31) is provided inside the housing (11). An oil drain passage (21) connected to the oil sump chamber (14) and the other end connected to the drain cover (31) and extending in the direction of gravity, and one end to the rotating body storage chamber (12). A drainage channel (23) having the other end connected to the drain cover (31) and one end connected to the rotating body storage chamber (12) and the other end via the oil sump chamber (14). A water drainage device for a rotary electric machine, characterized in that a vent passage (25) connected to the oil discharge passage (21) is opened.