JPS6332901Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the cooling structure of a motor that drives a fan that blows air to an automobile radiator or condenser to cool them.

Conventionally, radiator fans for automobiles have utilized the rotation of the engine, so there has been little need for special consideration for cooling the drive source itself. The same applies to a fan that cools a condenser in a cooling cycle. However, in recent years, there has been a demand for the cooling fan to be separated from the engine and driven using its own drive source motor.

However, if the motor is placed behind a radiator or condenser that is generally installed in the front of the engine room, the cooling effect will not be improved because it will be exposed to hot air that has passed through the radiator, etc. From the viewpoint of waterproofness, the motor must have a complicated casing structure and be large in size, which poses a problem of high cost.

An object of the present invention is to provide a drive motor for an automobile cooling fan having a structure with a high cooling effect, and to achieve cost reduction by downsizing the motor.

In order to achieve such an objective, the present invention provides an air intake port and an air exhaust port in the motor body, and
A shroud that supports the motor body is provided with an air guide pipe extending in the same direction as the air blowing direction, and a suction pipe that opens into the air guide pipe is attached, and the suction pipe and the exhaust port of the motor main body are communicated with each other. The air inside the motor body is sucked out using the pressure difference between the static pressure generated by the air flow passing through the air guide pipe and the atmospheric pressure acting inside the motor body.

The configuration of the present invention will be described in detail below based on an embodiment shown in the drawings.

Figure 1 shows the radiator cooling structure. This radiator cooling structure has a problem in that the fan 4 and the motor 18 that drives the fan 4 are attached to the back surface of the radiator 17 using the stay 5 of the shroud 2. That is, since a heat-sensitive motor is used as the drive source and is installed in a closed type in a high-temperature atmosphere to protect it from rainwater infiltration, cooling of the motor 18 itself, which is the fan drive source, is hindered. Therefore, in the present invention, one end of the motor 18 is opened to the atmosphere, and the other end is opened to the air flow whose flow velocity is accelerated in the shroud 2, and the motor 18 is
This was an attempt to forcefully circulate air inside.
FIG. 2 shows the cooling structure of the drive motor of this automotive cooling fan. This motor 18 is attached to a radiator or a capacitor (not shown) via a shroud 2 to which a motor body (casing) 1 is bolted via an elastic body. Shroud 2
The main purpose of the radiator is to surround the fan 4 attached to the motor shaft 3 and prevent the wind from being drawn in from around the fan to increase the amount of fan air from the front of the radiator. 4 and also serves as a bracket for attaching the motor body 1 to a radiator or the like. An air guide pipe 6 is attached to this shroud 2.

Since the air guide pipe 6 is intended to obtain a static pressure lower than the atmospheric pressure around the motor by using the fan air, it is desirable to provide it near the tip of the fan where the fan air volume is the largest. Therefore, in this embodiment, the air guide pipe 6 is fitted into a hole 15 formed in the vicinity of the base of the stay 5 of the shroud 2 in the same direction as the air blowing direction. In the case of this embodiment, the air guide pipe 6
is formed separately from the shroud 2, but it is also possible to integrally form the shroud 2 by drawing when the shroud 2 is press-molded. Further, as shown in FIG. 4, the air guide pipe 6 may be of a grommet type made of rubber or synthetic resin. This grommet type air guide pipe 6 can be easily attached to the hole 15 of the shroud 2 and the suction pipe 16 can be attached thereto. A suction pipe 16 is attached to the above-mentioned air guide pipe 6. This suction pipe 16 penetrates the peripheral wall of the wind guide pipe 6, is guided into the wind guide pipe 6, and is opened toward the leeward side. Here, opening toward the leeward side includes not only bending the tip of the suction pipe 16 downstream as shown in the figure, but also cutting the tip of the suction pipe 16 diagonally. This includes all opening shapes that eliminate the static pressure that drops due to narrowing of the flow path without sacrificing the flow rate. Furthermore, the opening position of the suction pipe may be either the large diameter part of the wind guide pipe or the small diameter part where the flow velocity increases.

A motor body, that is, a casing 1, which houses a rotor 7, brushes 8, magnets 9, etc., has an air intake port 10 and an air discharge port 11, and is structured to allow external wind to pass through. The air intake port 10 and the air discharge port 11 are bored at locations separated from each other in order to increase the ventilation effect. In particular, the air intake 10
It is desirable to form the brush 8 at the rear of the motor body 1, near the brush 8, or further behind the motor body 1, avoiding the vicinity of the fan 4 where negative pressure is generated. Furthermore, this air intake port 10
are perforated on the lower surface of the motor body 1 to prevent rainwater from entering. The longer it is, the more effective it is to prevent water from entering.

The suction pipe 16 and the air outlet 1 of the motor body 1
1 is connected by a pipe 13 made of rubber, synthetic resin, or metal, and the inside of the air guide pipe 6 and the inside of the motor body 1 are maintained in a communicating state. When the connecting pipe 13 is made of metal, it also functions as a reinforcing material to increase the supporting rigidity of the motor body 1, and when it is made of rubber or synthetic resin, it can be placed along the stay 5 of the shroud 2, so it acts as a blower resistance. It doesn't take up much space.

According to the drive motor 18 configured as described above, when the fan 4 rotates, part of the wind passing through the radiator etc. is guided to the wind guide pipe 6, increases the flow velocity in the wind guide pipe 6, and becomes quiet. In order to lower the pressure and create a pressure difference between the atmospheric pressure and the atmospheric pressure acting on the air intake port 10, the air inside the motor body 1 is drawn into the suction pipe 16.
sucked out from. Therefore, outside air is constantly introduced into the motor body 1 through the air intake port 10 to cool the brushes 8, rotor 7, magnets 9, bearings 14, and the like.

As is clear from the above explanation, the motor of the present invention cools the inside of the motor by directing a part of the fan air to the air guide tube that constitutes a so-called aspirator and sucking out the air inside the motor body. Because of this, it is possible to make the motor smaller and reduce costs with the same performance compared to a closed type motor, which has a larger size and higher rating in order to protect the motor from heat generated by brushes and other high-temperature atmospheres. Also,
Since the inside of the motor body and the outside are in communication, even if the motor body is rapidly cooled by rainwater and the air inside tries to contract, negative pressure will not be created and rainwater will not be drawn into the motor. Furthermore, since the wind passes through the motor body, the wear powder of the brushes is carried out to the outside, so that malfunction of the motor due to accumulation of wear powder can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a radiator cooling structure, FIGS. 2 and 3 are related to a drive motor for an automobile cooling fan according to the present invention, and FIG. 2 is a partially cutaway side view showing an enlarged view of the motor. FIG. 3 is a front view, and FIG. 4 is a central vertical sectional view showing another embodiment of the air guide pipe. 1...Motor body, 2...Shroud, 4...
Fan, 6...Air guide pipe, 10...Air intake port, 1
1...Air exhaust port, 13...Pipe, 16...Suction pipe, 17...Radiator, 18...Motor.

Claims (1)

[Scope of utility model registration request] An air intake port and an air outlet are provided in the motor body, and an air guide pipe extending in the same direction as the air blowing direction is provided in the shroud that supports the motor main body, and a suction pipe is installed in the air guide pipe, and a suction pipe is attached to the shroud that supports the motor body. The air inside the motor body is communicated with the exhaust port of the motor body, and the air inside the motor body is sucked out through the suction pipe by utilizing the pressure difference between the static pressure of the air flow passing through the air guide pipe and the atmospheric pressure acting inside the motor body. A drive motor for an automotive cooling fan.