JPH0974718A - Cooling-air introducing structure of automobile motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high waterproof property in comparison with a conventional structure by forming a labyrinth board in paths from a cooling air introducing port into a motor, and constituting the labyrinth board so as to include the first labyrinth plate, the second labyrinth plate and the third labyrinth plate. SOLUTION: A labyrinth board 20 is constituted so as to include a first labyrinth plate 21, a second labyrinth plate 22 and a third labyrinth plate 23. The first labyrinth plate 21 is formed as a unitary body together with an end housing 18. The end-side part from a supporting part 21c extending to the inside of a motor is brought into contact with a yoke housing 17 and fixed. The second labyrinth plate 22 is brought into contact with the yoke housing 17 and fixed at the inner side than a plate part 21b of the labyrinth plate 21. The plate 22 is extended at the specified height approximately in the same direction as the first labyrinth plate 21. The third labyrinth plate 23 is extending into the inner surface of the motor in the horizontal direction from the end housing 18 with a gap being provided to the side of the center of the motor than the supporting part 21a of the first labyrinth plate 21. As a result, high waterproof property is provided, and the attachment of dust and the like intruding together with cooling air to the constituting parts of the motor can be prevented.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Generally, in a motor for an automobile, for example, an electric fan motor, outside air is introduced into the motor to cool the motor as the motor becomes smaller. It has been practiced to provide holes to introduce outside air into the motor. In addition, a vent hole is formed in the yoke of the motor to allow the air inside and outside the motor to flow in order to relieve the pressure difference between the inside and outside of the yoke and to discharge the water droplets caused by the dew condensation generated inside the motor.

However, in an electric fan motor for an automobile, in order to mount it in the engine room of the automobile,
Water, dust, and the like that enter the engine room enter through the cooling holes formed in the motor housing, and these water, dust, and the like adhere to the commutator and the brush section, which causes inconvenience.

In order to prevent this, a technique has been proposed in which a shielding plate is provided in the cooling hole portion so that water, dust and the like do not adhere to the commutator and the brush portion. For example, a proposed technique using a damper that opens at a predetermined temperature with a shape memory alloy (see Japanese Utility Model Publication No. 62-54559), a technique using a blower tube (see Japanese Utility Model Publication No. 63-74059), and a plurality of housings are provided. A technique in which a through-hole is formed and a tail cover having a stripe-shaped through-hole is attached so as not to coincide with the through-hole with a gap (see Japanese Utility Model Laid-Open No. 64-40258) provided in a housing. A technique of mounting a pipe in a hole (Japanese Utility Model Publication No. 57-31648), a technique of using a dustproof cover (Japanese Utility Model Publication No. 56-52461), and the like are known.

However, in any of the above proposed techniques, there is a problem that the number of assembling steps and the number of parts increase. In particular, as shown in FIG. 4, when a separate pipe P is used, the pipe P projects below the motor M, so it is necessary to take measures such as interference prevention on the mounting partner.
Further, since the pipe mounting portion is located on the inner side of the motor yoke, the water inside the motor cannot be completely discharged.

Therefore, as shown in FIG. 5, a cooling air introduction port 59 is formed in the housing 57, and the cooling air introduction port 5 is formed.
A technique in which a plurality of shielding pins 50 integrated with the end frame 58 are formed so as to extend from the end frame 58 so as to cover the cooling air introduction port 59 with a gap therebetween (actual opening flat 6
-88164).

Further, as a technique in which the waterproof property of the above-mentioned proposed technique is further improved, as shown in FIG.
1 is provided at the end of the end housing 62, a cylinder 63 integrated with the end housing 62 is extended in the downward direction of gravity, and the tip of the cylinder 63 is fixed by contacting with the housing 64. Report 99-018 (issue date: November 15, 1994)} is proposed.

However, with this technique, it is possible to prevent water droplets from directly impinging on the inside of the motor.
Although the water droplets attached to 3 drop to the inner surface of the yoke, there is a possibility that the water droplets may penetrate along the inner surface of the yoke into the motor due to the negative pressure inside the motor.

An object of the present invention is to provide a motor for an automobile with a higher waterproof property than before without increasing the number of parts, and to prevent dust and the like that enter with the cooling air from adhering to motor component parts. Another object of the present invention is to provide a cooling air introduction structure for an automobile motor.

[0010]

According to the present invention, there is provided a cooling air introduction structure for an automobile motor, wherein the cooling air introduction port is formed downward at the end portion of the end housing when the motor is arranged. A labyrinth plate is formed in a passage from the cooling air introduction port to the inside of the motor, and the labyrinth plate is fixed in contact with the yoke housing and fixed in a direction substantially vertical to a horizontal direction when the motor is installed, A second maze plate which is fixed to the yoke housing on the inner side of the motor from the first maze plate and extends substantially in the same direction as the first maze plate; and a third maze plate which horizontally extends from the end housing. It is characterized in that it is configured to include.

Preferably, in a motor for an automobile in which a cooling air introduction port is formed downward at the end of the end housing when the motor is arranged, a maze plate is formed in a passage from the cooling air introduction port to the inside of the motor. The maze plate is integrally formed with the end housing and a first maze plate which is fixedly contacted with the yoke housing in a substantially vertical direction continuously with a support portion extending from the end housing with respect to the horizontal direction when the motor is installed. A second labyrinth plate that is fixed to the yoke housing inside the motor from the first labyrinth plate and extends substantially in the same direction as the first labyrinth plate; and a second labyrinth plate that is integrally formed with the end housing and extends horizontally from the end housing. Third
And a maze board.

Further, it is preferable that the height of the second maze plate is set to a height at which suction force is blocked against a negative pressure on the cooling air inlet side of the second maze plate.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a maze plate is formed in the passage from the cooling air introduction port to the inside of the motor.
A first maze plate that is fixed in contact with the yoke housing and is fixed substantially vertically to the horizontal direction when the motor is installed, and is substantially the same as the first maze plate that is fixed in contact with the yoke housing inside the motor from the first maze plate. Second extending in the direction
Since the maze plate and the third maze plate extending horizontally from the end housing are included, only the cooling air is introduced into the motor by the maze plate to prevent the intrusion of water droplets.

That is, since the first maze plate is fixed substantially vertically with respect to the horizontal direction when the motor is installed,
Water droplets that enter from the cooling air inlet formed downward are blocked by the first maze plate to prevent the water droplets from directly hitting the inside of the motor.

The water droplets stopped by the first maze plate fall on the inner surface of the yoke housing. The water drops try to enter the motor together with the cooling air due to the negative pressure inside the motor, but are blocked by the second maze plate. Especially by setting the height x of the second maze plate higher than the negative pressure,
Water droplets cannot pass over the second labyrinth plate and can be prevented from entering the motor.

Further, since the third maze plate extends in the horizontal direction from the end housing, dust and the like that enter with the cooling air due to the third maze plate are distributed to the main parts constituting the motor such as the commutator and the brush. Prevents adhesion.

Further, the first maze plate and the second maze plate which constitute the maze plate.
If the maze plate and the third maze plate are integrally formed with the end housing, the assembly is easy and the number of parts can be reduced.

[0018]

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 and 2 show a first embodiment of the present invention. FIG. 1 is a cross-sectional explanatory view of an essential part, and FIG. 2 is A- of FIG.
FIG. 3 is a cross-sectional view taken along line A, and FIG. 3 is a cross-sectional view of main parts as seen from the direction B in FIG.

In FIG. 1, the motor M is a stator 11
An armature 12 having a winding 12a, a rotating shaft 13 of the armature 12, and a bearing portion 14 that supports the rotating shaft 13
And a commutator 15 disposed on one end side of the rotary shaft 13, and a brush device 16 slidingly contacting the commutator 15.
These configurations are publicly known techniques, and their details are omitted.

Reference numeral 17 is a yoke housing,
Reference numeral 18 is an end housing. In this example, the cooling air introduction port 19 is formed between the end portion of the yoke housing 17 and the end housing 18.
9 is formed so as to open downward when the motor is arranged. That is, as shown in FIG. 1, the yoke housing 1
7 has an L-shaped section 17 extending outward at a predetermined position of 7.
a and an L-shaped section 18a formed in the end housing so as to face the L-shaped section.
9 is formed.

A cooling air outlet 25 is provided in the yoke housing 17 at a position opposite to the cooling air inlet 19. The end housing 18 of this example is formed of synthetic resin, and the maze plate 20 is formed in the end housing 18 so as to extend to the inside of the motor. In this example, the maze plate 20 is formed by integral molding, and is formed as a maze in the passage from the cooling air inlet 19 to the inside of the motor.

As shown in FIG. 1, the maze plate 20 of this example is
First maze plate 21, second maze plate 22, and third maze plate 23
It is comprised including. The formation of the maze plate 20 in this example is configured with reference to the horizontal direction when the motor is installed, the first maze plate 21 is formed integrally with the end housing 18, and the support portion 2 extending inside the motor is provided.
The end portion side from 1a is fixed in contact with the yoke housing 17 and is formed as a plate portion 21b having a predetermined height in a substantially vertical direction.

The second maze plate 22 is formed so as to contact and be fixed to the yoke housing 17 on the inner side of the motor from the plate portion 21b of the first maze plate 21 and to extend at a predetermined height in substantially the same direction as the first maze plate 21. ing. That is, the second maze plate 22 of this example
As shown in FIG. 2, is formed integrally with a third maze plate 23, which will be described below, and is formed leaving the opening 24. The height x (see FIG. 1) of the second maze plate 22 of the present example from the inner surface of the yoke housing 17 is set to a height that is not affected by the negative pressure inside the motor when the motor is driven.

As shown in FIG. 1, the third maze plate 23 extends horizontally from the end housing 18 toward the inner surface of the motor with a gap closer to the center of the motor than the supporting portion 21a of the first maze plate 21. The second maze plate 22 is formed so as to extend to a portion above the extension on the tip side of the second maze plate 22 and is integrated with the second maze plate 22 on the tip side as shown in FIG.

Since it is formed as described above, the water and dust entering from the cooling air introduction port 19 formed downwards, first of all, the support portion 21a and the plate portion 21 of the first maze plate 21.
It is blocked by b and prevents a water drop from directly hitting the inside of the motor. The water droplets stopped by the first maze plate 21 fall on the inner surface of the yoke housing 17.

The water drops that have fallen and adhered to the yoke housing 17 try to enter the motor together with the cooling air due to the negative pressure inside the motor, but are blocked by the second maze plate 22. In particular, the yoke housing 1 of the second maze plate 22
By setting the height x from the inner surface of the motor 7 higher than the negative pressure, the water droplets cannot pass over the second labyrinth plate 22 and can be prevented from entering the inside of the motor.

Further, since the third maze plate 23 extends in the horizontal direction from the end housing 18, the dust and the like which enter with the cooling air by the third maze plate 23 are commutator,
Prevents adhesion to major parts of the motor such as brushes. By the above, only the cooling air is introduced into the inside of the motor to prevent the intrusion of water droplets and the invasion of dust and the like.

Further, the cooling air inlet 19 is arranged on the lower side when the motor is installed, and the presence of the second labyrinth plate 22 causes water and dust that once enter the motor M to collect inside the motor M. Instead, it can be discharged to the outside of the motor through the cooling air introduction port 19 and can function as a drainage port. Further, since the maze structure is provided inside the motor M, it is possible to prevent the protrusion to the outside of the motor as in the prior art in which a pipe or the like is attached, and it is possible to prevent interference with other parts. Further, since there is no pipe mounting portion, water inside the motor can be completely discharged to the outside.

[0030]

As described above, according to the present invention, in a motor for an automobile, the motor structure has a higher waterproof property as compared with the conventional one without increasing the number of parts, and dust and the like that enter with the cooling air are included in the motor structure. It can be prevented from adhering to parts, and it is not necessary to provide a shield plate separate from the end housing, so that the number of parts and the number of assembling steps can be reduced.

[Brief description of drawings]

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

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of essential parts as seen from the direction B in FIG.

FIG. 4 is a cross-sectional explanatory view of a main part showing a conventional example.

FIG. 5 is a cross-sectional explanatory view of an essential part showing another conventional example.

FIG. 6 is a cross-sectional explanatory view of a main part showing still another conventional example.

[Explanation of symbols]

 Reference Signs List 11 stator 12 armature 12a winding 13 rotary shaft 14 bearing 15 commutator 16 brush device 17 yoke housing 18 end housing 19 cooling air inlet 20 maze plate 21 first maze plate 22 second maze plate 23 third maze plate 24 Opening 25 Cooling air outlet M Motor

Claims (3)

[Claims] 1. In a motor for an automobile in which a cooling air inlet is formed downward at the end of the end housing when the motor is arranged, a maze plate is formed in a passage from the cooling air inlet to the inside of the motor. The maze plate is in contact with and fixed to the yoke housing and is fixed in a direction substantially vertical to the horizontal direction when the motor is installed, and the first maze plate is in contact with and fixed to the yoke housing on the inner side of the motor from the first maze plate. A cooling air introduction structure for a motor for an automobile, comprising a second maze plate extending substantially in the same direction as the maze plate, and a third maze plate horizontally extending from the end housing. . 2. In a motor for an automobile in which a cooling air inlet is formed downward at the end of the end housing when the motor is arranged, a maze plate is formed in a passage from the cooling air inlet to the inside of the motor. The maze plate is formed integrally with the first housing and the first maze plate, which is fixed to the yoke housing in contact with and fixed to the yoke housing in a substantially vertical direction continuously with the support portion extending from the end housing with respect to the horizontal direction when the motor is installed. No. 1 second labyrinth plate which is fixed to the yoke housing on the inner side of the motor from the labyrinth plate and extends in substantially the same direction as the first labyrinth plate; and third labyrinth plate formed integrally with the end housing and extending horizontally from the end housing. A cooling air introduction structure for a motor for an automobile, characterized by including a maze plate. 3. The height of the second maze plate is set to a height that blocks suction force against negative pressure on the cooling air inlet side of the second maze plate. 1 or 2
3. A structure for introducing cooling air into an automobile motor according to any one of 1.