JP2000032700A - Cooling structure for motor with brush for automobile and brush holder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device, for a motor, which has a sufficient dustproof functions, without increasing the number of components and the number of assembling man-hours and which is suitable for automation in the motor for an automobile. SOLUTION: A vent 21 which is used to cool the inside of a motor is formed in a housing 18. The vent 21 is formed in an end frame 19 on the end face of the housing 18 on the side opposite to an output shaft. A brush holder 22 holds a brush, a brush pressure means and a brush power supply means in parts faced with the side of an armature, it is arranged and installed on the inner circumference of the housing 18, and it is covered with the end frame 19 from the outside of the motor. A cooling-wind inlet port 25 which is formed in the brush holder 22, in such a way that the open air which creeps from the vent 21 is guided to the side of the armature is separated from the vent 21 to the upper direction. A discharge port 18b, by which the open air is introduced from the cooling-wind inlet port 25 is discharged to the outside of the motor from the inside of the motor is formed in the end face, in the output direction of a shaft 13 of the housing 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure and a brush holder for a motor with a brush for an automobile, and more particularly to a cooling structure and a brush holder suitable for an electric fan motor for cooling a radiator.

[0002]

2. Description of the Related Art Generally, in a motor for an automobile, for example, an electric fan motor, external air is introduced into the motor for cooling as the size of the motor is reduced. There is known a technique in which a plurality of ventilation holes are provided to introduce outside air into a motor. For example, as shown in FIGS. 15 and 16, a plurality of ventilation holes 111 are provided in an end frame 110 of the electric fan motor.
There is known a technique provided with the above.

[0003] However, in an electric fan motor for an automobile, since it is installed in an engine room of the automobile,
Water, dust and the like that enter the engine room enter through a vent provided on the surface of the motor.
Since it adheres to the commutator, the brush portion, and the bearing, inconvenience occurs.

In order to prevent this, there has been proposed a technique in which a shielding plate is provided at a portion of a vent so that water, dust and the like do not adhere to a commutator, a brush portion, and a bearing. For example, on the drive shaft side in the body where the rotor shaft is inserted through the bearing,
A technique of providing a guide plate for positively introducing outside air into the ventilation path of the rotor core (see Japanese Utility Model Laid-Open No. 3-30754), a technique using a blower tube (see Japanese Utility Model Application Laid-Open No. 63-74059), A technique of attaching a pipe to a hole provided in a housing (Japanese Utility Model Publication No. 57-31648) and a technique of using a dustproof cover (Japanese Utility Model Application Publication No. 56-52461) are known.

However, any of the above proposed techniques has a problem that the number of assembling steps and the number of parts are increased. In particular, when a separate pipe is used, since the pipe protrudes below the motor, countermeasures such as interference prevention are required for the counterpart mounting. In addition, in each of the above prior arts, the structure was not suitable for automation.

Accordingly, the applicant of the present application has proposed a technique in which a ventilation hole is formed in a motor housing, and a plurality of shielding pins extending integrally with the end frame are covered with a clearance with the ventilation hole. (See Japanese Utility Model Laid-Open No. 6-88164).

The present invention relates to an improvement of the technique disclosed in Japanese Utility Model Application Laid-Open No. Hei 6-88164, and has an object to provide a waterproof and dustproof motor motor for an automobile without increasing the number of parts and the number of assembly steps. An object of the present invention is to provide a motor cooling device having a function and suitable for automation.

[0008]

According to a first aspect of the present invention, there is provided a cooling structure for an automobile motor, wherein the armature includes a rotating shaft, a housing into which the armature is inserted, and a bearing that supports the rotating shaft. An end frame having a bearing holding portion, a brush holder for holding a brush, a brush pressing means, and a brush power supply means, and a brush holder inserted facing the armature side. In the brush holder, an annular wall surrounding the bearing extends from the brush holder until it comes into contact with the end frame, and the end frame is provided with a vent for introducing outside air from outside the motor. A cooling air introduction port for guiding outside air introduced from the ventilation port to the armature side, the brush holder being provided with the end frame and the brush holder. Is formed as a ventilation path that circulates outside air from the ventilation port in a direction against gravity and guides the cooling air to the cooling air introduction port. A discharge port is provided for discharging outside air introduced from the introduction port from the inside of the motor to the outside of the motor.

A brush holder according to a second aspect of the present invention is a brush holder for holding a brush, a brush pressing means and a brush power supply means on a side on which an armature is provided, and a ventilation on a side on which an end frame is provided. A part of the path is formed, and a cooling air inlet is provided in a direction against gravity.

[0010]

According to the present invention, the end frame and the brush holder are assembled so that the cooling air introduction port provided in the brush holder is spaced apart from the ventilation port on the end frame in the upward direction. Since a ventilation path is formed in the space surrounded by the frame and the brush holder, the outside air enters through the ventilation port on the end frame, goes around the outer circumference of a series of annular walls surrounding the bearing, and reaches the cooling air introduction port. Then, the armature and brush inside the motor are cooled and discharged to the outside of the motor. Also, if the motor breaks water, dust, etc. entering the engine room, it must be against gravity in order to reach the inside of the motor, and it is difficult for water, dust, etc. to adhere to the commutator, brushes, bearings Becomes Furthermore, a discharge port for discharging outside air introduced from the cooling air introduction port to the outside of the motor from the inside of the motor to the output direction end surface of the rotating shaft of the housing is provided, so that a positive air flow can be generated inside the motor,
The inside of the motor is efficiently cooled. At this time, the brush holder forms a part of the ventilation passage as the outside air, thereby suppressing an increase in the number of assembling steps.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. The members, arrangements, and the like described below do not limit the present invention, and can be variously modified within the scope of the present invention.

FIGS. 1 to 8 show an embodiment of the present invention. FIG. 1 is an explanatory sectional view of a main part, and FIG.
A arrow view, FIG. 3 is a brush holder viewed from the armature side,
4 is a sectional view taken along line BB in FIG. 3, FIG. 5 is an end frame viewed from the armature side, FIG. 6 is a sectional view taken along line CC in FIG. 5, FIG. 7 is an explanatory diagram showing the flow of cooling air in FIG.
FIG. 8 is an explanatory diagram showing the flow of cooling air in FIG.
It is DD sectional drawing of FIG.

In FIG. 1, a motor M includes a stator 11
, An armature 12 having a winding 12 a, a rotating shaft 13 of the armature 12, and a bearing 1 for supporting the rotating shaft 13.
4, 15 and a commutator 1 disposed at one end of the rotating shaft 13.
6 and a brush device 17 that comes into sliding contact with the commutator 16.

Reference numeral 18 denotes a housing, and reference numeral 1 denotes a housing.
9 is an end frame. The housing 18 of this embodiment has a circular inner periphery, and is provided with an outer peripheral end near the end frame 19 so that the folded portion 18a extends outward. A cooling air discharge port 18b is formed on the end surface of the housing 18 in the output direction of the rotating shaft 13 (that is, on the side opposite to the end frame 19). With this configuration, an air flow can be positively created inside the motor M, and the inside of the motor M can be efficiently cooled.

The brush device 17 of the present embodiment comprises a brush holder 2
2, a brush box 17a, a brush 17b, a pigtail 17c, and a spring 17d are main components. Then, the cooling structure S of the motor for an automobile according to the present embodiment.
Is composed of a brush holder 22 and an end frame 19.

The brush holder 22 according to the present embodiment includes the housing 1
8 is formed in a disk shape conforming to the inner peripheral shape. In this example, the brush holder 22 is formed so as to conform to the inner peripheral shape of the housing 18. However, this example is merely an example, and the present invention is not limited to this. The brush holder 22 has a folded contact portion 24 and a cooling air inlet 25 formed thereon, and a series of annular walls 23 surrounding the outer periphery of the bearing 15 are in contact with the end frame 19 by the brush holder 22. It is growing.

The folded contact portion 24 of this embodiment has a width substantially equal to the extension width of the folded portion 18a of the housing 18, and is provided around the end frame 19.

The cooling air inlet 25 of this embodiment is a hole formed for communicating the armature 12 side of the brush holder 22 and the end frame 19 side, and the folded contact portion 24
And an annular wall 23.

On one side of the brush holder 22, that is, on the core side of the armature 12, a brush box 17a, a brush 17b, a pigtail 17c, a spring 17d, an electrode plate 17e, and the like are provided.

The end frame 19 of the present embodiment is engaged with the folded portion 18 a of the housing 18, is formed in a circular shape in accordance with the shape of the housing 18, and has a bearing holding portion 31 engaged with the bearing 15. And an upright portion 32 whose outer edge is folded in the motor axis direction, and a vent 21 as main components.

An engaging claw 26 having a predetermined width is provided at a predetermined position of the upright portion 32 so as to extend inward from the upright portion 32.

Next, the assembling of the cooling device for an automobile motor having the above configuration will be described.
The armature 12 is inserted therein, and then the brush holder 22 with the brush device 17 is inserted. Then, the end frame 19 is assembled so as to cover the brush holder 22.
At this time, the cooling air introduction port 25 on the brush holder 22 is located at a position separated upward from the ventilation port 21 on the end frame 19 in the normal mounting state of the motor.

The folded portion 18a of the housing 18
The folded contact portion 24 of the brush holder 22 is sandwiched between the brush holder 22 and the upright portion 32 of the end frame 19, and the housing 18 and the claw 26 are caulked and fixed.

In this way, the space sandwiched between the end frame 19 and the brush holder 22 becomes a ventilation passage through which the outside air that has entered through the vent 21 on the end frame 19 passes. The outside air entering through the vent 21 on the end frame 19 reaches the cooling air introduction port 25 while rotating around the outer periphery of the annular wall 23 in the space sandwiched between the end frame 19 and the brush holder 22, that is, in the ventilation path. The inside is cooled and discharged to the outside of the motor M from the discharge port 18b of the housing. At this time, as shown in FIGS. 1 and 7, outside air is introduced from the back side of the brush holder 22. Since the brush holder 22 is cooled from the back side, the brush 17b
Is cooled efficiently.

Also, since the distance from the ventilation port 21 to the cooling air introduction port 25 is separated upward as described above, when the motor M is exposed to water, dust or the like that enters the engine room, the motor M In order to penetrate, it is necessary to take a path in the direction against gravity, making it difficult to penetrate.
5 is isolated from the path of the outside air by the annular wall 23, so that intrusion of water, dust and the like into the bearing 15 can be prevented.

FIGS. 9 to 14 show second to fifth embodiments of the present invention. FIG. 9 is an explanatory sectional view of a principal part similar to FIG. 1 showing the second embodiment, and FIG. , FIG. 11 is a view taken along the line FF in FIG. 10, FIG. 12 is a view similar to FIG. 2 showing the third embodiment, FIG. 13 and FIG.
FIG. 4 is a sectional view similar to FIG. 8 showing the fourth and fifth embodiments. In the above embodiments, the same members and the like as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

In the second embodiment shown in FIGS. 9 to 11, the lowermost portion of the end frame 19 when the motor is properly mounted is extended to the outside of the motor, and the gap between the extended portion 41 and the brush holder 22 is defined as a vent 42. I have. With the configuration as in this example, the structure is such that the vent 42 is oriented vertically, so that it is difficult for water droplets and dust to enter the motor from the vent 42 against the gravity.
Since the cooling air inlet 25 and the cooling air inlet 25 can be further separated from each other, the waterproof and dustproof effects are improved.

In the third embodiment shown in FIG. 12, embossing ribs 43 having a depth attained by the brush holder 22 are arranged at several places on the end frame 19, and a path from the vent 21 to the cooling air inlet 25 is formed in a maze structure. Has been granted. With the configuration as in the present embodiment, the waterproof and dustproof effects are further improved as compared with the first embodiment.

In the fourth embodiment shown in FIG. 13, a forming rib 44 having a height reaching the end frame 19 from the brush holder 22 is provided, and a maze structure is provided as in FIG.

The maze structure constituted by the third and fourth embodiments is not limited to the above-described embodiment, but may be constituted by forming irregularities on the brush holder 22 and the end frame 19. Is included. Further, a maze structure may be formed in a path formed between the brush holder 22 and the end frame 19 by another component.

In the fifth embodiment shown in FIG. 14, in addition to the maze structure formed by the forming ribs 44 as in FIG. 13, the cooling air inlet 25 is disposed only at a position close to the ventilation port 21. A blocking rib 45 is provided between the lower part of the airbag and the ventilation port 21 to block the path of the outside air. With such a configuration, as shown by the arrow in the figure, the cooling air inlet 25
The path leading to the vehicle can be lengthened, and the waterproof and dustproof properties can be further improved in combination with the maze structure.

[0032]

As described above, since the space is upwardly separated from the ventilation hole formed in the end frame to the cooling air introduction hole formed in the brush holder, water, dust and the like enter the inside of the motor. Can be prevented. In addition, since outside air that has entered through the ventilation port is blocked by the annular wall, entry of water, dust, and the like into the bearing can also be prevented. The present device has no increase in the number of parts compared to the conventional device, can be assembled only by stacking in the rotation axis direction, and has an effect that it is suitable for automation.

Further, a discharge port for discharging outside air introduced from the cooling air introduction port to the outside of the motor from the inside of the motor is provided at an end face in the output direction of the rotating shaft of the housing, so that the flow of air inside the motor is positively increased. It is possible to efficiently cool the inside of the motor. At this time, since the brush holder forms a part of the ventilation path through which the outside air passes, the number of assembly steps can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory sectional view of a main part showing an embodiment of the present invention.

FIG. 2 is a view taken in the direction of arrows AA in FIG.

FIG. 3 is a view of the brush holder as viewed from the armature side.

FIG. 4 is a sectional view taken along line BB in FIG. 3;

FIG. 5 is a diagram of the end frame as viewed from the armature side.

6 is a sectional view taken along the line CC in FIG.

FIG. 7 is an explanatory diagram showing a flow of cooling air in FIG. 1;

8 is an explanatory diagram showing a flow of cooling air in FIG. 2, and is a cross-sectional view taken along the line DD in FIG. 7;

FIG. 9 is an explanatory sectional view of a main part, similar to FIG. 1, showing a second embodiment.

FIG. 10 is a view as seen in the direction of arrows EE in FIG. 9;

FIG. 11 is a view as viewed in the direction of arrows FF in FIG. 10;

FIG. 12 is a view similar to FIG. 2, but showing a third embodiment.

FIG. 13 is a sectional view similar to FIG. 8, showing a fourth embodiment.

FIG. 14 is a sectional view similar to FIG. 8, showing a fifth embodiment.

FIG. 15 is an explanatory sectional view of a main part showing a conventional example.

16 is a view as viewed in the direction of arrows GG in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 Armature 12a Winding 13 Rotation shaft 14, 15 Bearing 16 Commutator 17 Brush device 17a Brush box 17b Brush 17c Pigtail 17d Spring 17e Electrode plate 18 Housing 19 End frame 21 Vent 22 Brush holder 23 Annular wall 24 Folding contact part 25 Cooling Wind introduction port 26 Engagement claw 31 Bearing holding part 32 Standing part 41 Overhang part 42 Vent hole 43 Launching rib 44 Molding rib 45 Cut-off rib M Motor S Motor motor cooling structure

Claims (2)

[Claims] 1. An armature having a rotating shaft, a housing into which the armature is inserted, and an end frame having a bearing holding portion that engages with a bearing that supports the rotating shaft.
Holding the brush, the brush pressing means and the brush power supply means,
A brush holder inserted facing the armature side,
A cooling structure for a motor with a brush for an automobile, comprising:
In the brush holder, an annular wall surrounding the bearing is extended from the brush holder until it comes into contact with the end frame, and the end frame is provided with a vent for introducing outside air from outside the motor, The holder has
A cooling air introduction port for guiding outside air introduced from the ventilation port to the armature side is provided, and a region surrounded by the end frame and the brush holder circulates the outside air from the ventilation port in a direction against gravity. The housing is formed as a ventilation path leading to the cooling air introduction port, and the housing is provided at the end face in the output direction of the rotating shaft with an exhaust port for discharging outside air introduced from the cooling air introduction port to the outside of the motor from the inside of the motor. A cooling structure for a motor with a brush for an automobile. 2. A brush holder for holding a brush, a brush pressing means, and a brush power supply means on a side on which an armature is provided, wherein a part of a ventilation path is formed on a side on which an end frame is provided, A brush holder, wherein a cooling air introduction port is provided in a direction against gravity.