JP2004278368A - Waterproof mechanism of automobile motor-fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waterproof mechanism of a motor fan for perfectly preventing intrusion of water into the motor from the rotation shaft of a fan motor. <P>SOLUTION: The waterproof mechanism includes a 1st extension part 10 and a 2nd extension part 20. The 1st extension part 10 is extended to the tip side of a rotation shaft 2c of the motor 2 in close contact to the outside periphery of a motor main-body 2a of the motor fan A. The 2nd extension part 20 is extended to the motor main-body 2a so as to cover the outside periphery of a cylindrical cover 2d from a boss 3b of the fan 3 of the motor fan A, and is positioned to the inside periphery of the 1st extension part 10. The 1st extension part 10 and the 2nd extension part 20 constitute a labyrinth structure in combination. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a waterproof structure of a motor fan for a vehicle used for cooling a heat exchanger such as a radiator of a vehicle.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a technique has been known in which a shroud to which a motor fan is attached is mounted on a heat exchanger while being inclined in a vehicle front-rear direction and is incorporated in an engine room (see Patent Document 1).
[0003]
Further, a technique is known in which a cylindrical cover is provided at the tip of the rotation shaft of the motor of the motor fan to prevent water from entering the motor from the rotation shaft of the motor (see Patent Document 2).
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2000-127770 (pages 1-3, FIG. 1)
[Patent Document 2]
JP-A-7-195933 (Pages 1-3, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, when the motor fan and the cylindrical cover of the known document are attached to the heat exchanger in a state of being inclined in the vehicle front-rear direction, water that has flown into the engine room enters the gap between the motor body and the boss of the fan, There is a problem that the water jumps or is transmitted to the motor main body and penetrates and adheres to the motor from the rotating shaft of the motor, and as a result, the motor bearing is fixed by rust.
[0006]
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a waterproof structure of a motor fan that can completely prevent water from entering the motor from the rotation shaft of the motor of the motor fan.
[0007]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a waterproof structure for a motor fan for an automobile mounted on a heat exchanger in a state where a fan side is inclined downward with respect to a motor side, wherein the motor fan is in close contact with an outer peripheral portion of a motor body. And a first extending portion extending toward the tip end of the rotating shaft of the motor in a state in which the motor extends.
[0008]
According to a second aspect of the present invention, in the waterproof structure for a motor fan for an automobile according to the first aspect, the motor fan extends from a boss portion of the fan toward the motor body and is located on an inner peripheral side of the first extension portion. And a labyrinth structure is formed by the first extended portion and the second extended portion.
[0009]
According to the third aspect of the present invention, the waterproof structure of the motor fan for an automobile mounted on the heat exchanger with the fan side inclined downward with respect to the motor side, wherein the motor is provided at least above the rotating shaft of the shroud. A wall portion facing the boss portion of the fan is provided.
[0010]
According to a fourth aspect of the present invention, in the waterproof structure for a motor fan for an automobile according to any one of the first to third aspects, a motor cooling opening is formed around a lower part of the motor body of the shroud.
[0011]
Function and effect of the present invention
According to the first aspect of the present invention, the first extending portion is provided in a state in which the first extending portion is in close contact with the outer periphery of the motor main body of the motor fan and extends toward the tip end of the rotating shaft of the motor, so that the inside of the engine room is provided. When rainwater or water from a car wash enters the motor, the water falls along the first extending portion and falls downward from the tip end of the rotating shaft. Can be prevented from invading.
[0012]
According to the second aspect of the present invention, the second extending portion extends from the boss portion of the motor fan to the motor main body, and the labyrinth structure is formed by the first extending portion and the second extending portion. become.
[0013]
Therefore, even when rainwater or water from a car wash enters the engine room and is splashed, the splashed water can be completely prevented from entering the motor from the rotation shaft of the motor, and a high waterproof effect can be realized.
[0014]
According to the third aspect of the present invention, the wall facing the boss portion of the motor fan is provided at least above the rotation shaft of the shroud, thereby preventing water falling along the shroud from above from entering. be able to.
[0015]
According to the fourth aspect of the present invention, since the motor cooling opening is formed around the lower part of the motor main body of the shroud, the heat of the motor main body can be radiated to the outside and the temperature rise of the motor can be suppressed.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of a waterproof structure of a motor fan for an automobile of the present invention will be described.
[0017]
FIG. 1 is a longitudinal sectional view of an automobile motor fan according to an embodiment of the present invention, FIG. 2 is a front view of a shroud, and FIG. 3 is an enlarged view around the motor of FIG.
[0018]
As shown in FIGS. 1 and 2, a motor fan A for an automobile according to the present embodiment is attached to a heat exchanger (shown by a two-dot chain line) in a state of being inclined by about 45 ° toward the front of the vehicle, and is provided with a shroud 1. , The motor 2 and the fan 3 as main components.
[0019]
The shroud 1 is formed by using a resin material to form a substantially cylindrical case portion 1a protruding diagonally downward on the vehicle front side, and is surrounded by a partition wall 1b protruding diagonally downward on the vehicle front side and an outer peripheral portion. The motor cooling opening 1c is formed.
[0020]
In the case portion 1a, three mounting portions 1e each having a bolt insertion hole 1d are formed, and in each of the mounting portions 1e, the bolt B1 is inserted into the bolt insertion hole 1d via the bracket 2f, so that the motor body 2a Are fixed to the shroud 1.
[0021]
As shown in FIG. 3, a central portion of the case portion 1a is attached to an outer peripheral portion 2b of the motor body 2a in a state in which the first extended portion extends to a tip end side of a rotary shaft 2c of the motor 2 in a state of being in close contact therewith. 10 are formed.
[0022]
The motor 2 is a cylindrical motor, and a rotating shaft 2c of the motor 2 is rotatably supported by a motor bearing (not shown).
[0023]
The fan 3 is composed of a plurality of blades 3a and a boss 3b connecting the base ends of the blades 3a.
[0024]
Reference numeral 3c denotes a rib for reinforcing the boss 3b.
[0025]
A central portion of the boss portion 3b extends toward the motor body 2a, and a second extension portion 20 located on the inner peripheral side of the first extension portion 10 is formed.
[0026]
A locking portion 3d protrudes from the inner peripheral side of the second extending portion 20, and an insert member 3h resin-molded on the locking portion 3d is attached to the rotating shaft 2c by a nut B2. When the rotating shaft 2c of the motor 2 rotates, the fan 3 rotates together with the insert member 3h.
[0027]
A plurality of openings 3g for draining water are formed in the bottom 3f of the outer peripheral portion of the boss 3b and communicate with the outside. The openings 3g also serve to radiate heat of the motor 2 and cool it.
[0028]
On the other hand, the shroud 1 is formed on the shroud 1 so as to face the boss 3b and to protrude outward from the rotation shaft 2c of the motor 2 so as to form an eave.
[0029]
Reference numeral 3e denotes an opening for fixing the insert member 3h to the tip of the rotating shaft 2c.
[0030]
The first extended portion 10 and the second extended portion 20 form a labyrinth structure described below.
[0031]
Hereinafter, the operation and effect of the waterproof structure of the motor fan according to the present embodiment will be described with reference to FIG.
[0032]
In the waterproof structure of the motor fan according to the present embodiment, when the rotating shaft 2c of the motor 2 rotates, the fan 3 rotates together with the insert member 3h, and blows to the heat exchanger to cool the heat exchanger. I do.
[0033]
Then, the water T that has entered the engine room from above and transmitted from above the shroud 1 is once received by the wall portion 12 and is transmitted outward and falls.
[0034]
In addition, the water that has entered as indicated by the arrow P in the drawing falls down along the first extension portion 10 that is in close contact with the outer periphery 2b of the motor main body 2a, and then goes outside through the motor cooling opening 1c and the opening 3g. Discharged quickly.
[0035]
On the other hand, when water enters the engine room from the side, it falls downward along the bottom 3f of the boss 3b as shown by the arrow S in the figure, and is quickly discharged to the outside through the opening 3g. You.
[0036]
Further, the labyrinth structure formed by the first extension portion 10 and the second extension portion 20 can prevent water that has flown in the engine room from entering in the direction indicated by the arrow R.
[0037]
Therefore, in the waterproof structure of the motor fan of the present embodiment, the first extension portion 10 has a shape protruding toward the tip end of the rotating shaft 2c in a state of being in close contact with the outer periphery 2b of the motor main body 2a. Even when rainwater or water from a car wash enters the engine room, the water can be prevented from traveling along the motor main body 2a and entering the motor 2 from the rotating shaft 2c, and as a result, the motor fan A is inclined. Even when mounted on the heat exchanger in a state, a high waterproof effect can be realized.
[0038]
Further, since the second extending portion 20 protrudes from the boss portion 3b toward the motor main body 2a and is located on the inner peripheral side of the first extending portion 10, the first extending portion 10 and the second extending portion 10 are connected to each other. A labyrinth structure is formed in the part 20, so that even if rainwater or water from a car wash enters the engine room and is splashed, the splashed water can be prevented from entering the motor 2 from the rotating shaft 2c, and the waterproofness is high. The effect can be obtained.
[0039]
Further, since the wall portion 12 of the shroud 11 is provided, the water that has entered from above in the engine room can be temporarily received by the wall portion 12 of the shroud 1 and transmitted to the outside to be dropped.
[0040]
Further, since the first extension portion 10 is provided integrally with the shroud 1, the cost can be reduced, and the motor cooling opening 1c provided at the bottom can suppress the temperature rise of the motor.
[0041]
Further, there is an effect that the water collected in the boss 3b can be promptly discharged by the opening 3g.
[0042]
The embodiment of the present invention has been described above. However, the specific configuration of the present invention is not limited to the present embodiment, and the present invention is applicable even if there is a design change without departing from the gist of the invention. include.
[0043]
For example, although the motor of the present embodiment has been described as applying a cylindrical motor, it goes without saying that the present invention can also be applied to a flat motor.
[0044]
Further, as shown in FIG. 4, it is naturally conceivable to provide the cylindrical cover 30 described in the related art at the tip of the rotating shaft 2c of the motor 2.
[Brief description of the drawings]
FIG. 1 is a vertical end view of an automobile motor fan according to an embodiment of the present invention.
FIG. 2 is a front view of a shroud.
FIG. 3 is an enlarged view around the motor of FIG. 1;
FIG. 4 is a diagram showing an example in which a cylindrical cover is provided at a tip of a rotating shaft of a motor.
[Explanation of symbols]
A Motor fan B1 Bolt B2 Nut 1 Shroud 1a Case 1b Partition wall 1c Motor cooling opening 1e Bolt insertion hole 1f Bracket 2 Motor 2a Motor body 2b Outer periphery 2c Rotary shaft 2d Cylindrical cover 3 Fan 3a Blade 3b Boss 3c Rib 3d Stop 3e Opening 3f Bottom 3g Opening 3h Insert member 10 First extension 12 Wall 20 Second extension

Claims (4)

A waterproof structure of an automobile motor fan mounted on a heat exchanger with the fan side inclined downward with respect to the motor side,
A waterproof structure for a motor fan for an automobile, comprising: a first extension portion extending toward a tip end of a rotating shaft of the motor in a state of being in close contact with an outer peripheral portion of a motor body of the motor fan. The waterproof structure of a motor fan for an automobile according to claim 1,
A second extending portion extending from the boss portion of the fan of the motor fan to the motor body side and located on an inner peripheral side of the first extending portion;
A waterproof structure for a motor fan for an automobile, wherein a labyrinth structure is formed by the first extension portion and the second extension portion. A waterproof structure of an automobile motor fan mounted on a heat exchanger with the fan side inclined downward with respect to the motor side,
A waterproof structure for a motor fan for an automobile, wherein a wall portion facing a boss portion of the motor fan is provided at least above the rotation shaft of the shroud. The waterproof structure of an automobile motor fan according to any one of claims 1 to 3,
A waterproof structure for a motor fan for an automobile, wherein a motor cooling opening is formed around a lower part of a motor body of a shroud.

Images