JP2001061257A - Motor with cooling fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a motor with a cooling fan, by constituting the fan of an impeller section which is attached to the front end of a narrow connecting section extended from a fixing section, and positioning the impeller section on the outside of a bearing which rotatably journals a shaft. SOLUTION: A fan 31 is constituted of a narrow connecting section 52 which is extended from a fixing section 51 which fixes a rotor 23 to a shaft 23 and an impeller section 53 attached to the front end of the connecting section 52. Consequently, the shaft 23 becomes longer by the width of the connecting section 52 extended from the fixing section 51. Therefore, the size of a motor 1 does not increase even when the motor 1 is equipped with the fan 31. In addition, the impeller section 53 is extended in the direction corresponding to the rotor 22. In other words, the impeller section 53 is extended toward an air outlet 32. Therefore, the outside air introduced through an air inlet is surely discharged from the air outlet 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a motor with a cooling fan.

[0002]

2. Description of the Related Art In recent years, motors are required to be miniaturized and have a high output. Therefore, heat radiation measures suitable for miniaturization are indispensable. As a heat dissipation measure, there are a type of cooling with a fan attached to a shaft from the outside of the motor and a type of cooling with a fan attached to a shaft between a rotor and a bearing.

[0003]

However, in the former type, the motor itself can be maintained at the current size, but since the motor is cooled from outside the motor, the winding of the rotor serving as a heat source is generated. And it is difficult to cool the brush.

[0004] On the other hand, in the latter type, the cooling effect is improved, but the fan is disposed on the shaft between the rotor and the bearing, so that the rotor shaft becomes longer and the motor itself tends to become larger. there were.

The present invention has been made in view of such problems, and an object of the present invention is to provide a motor with a cooling fan that can be downsized.

[0006]

In order to achieve the above object, according to the present invention, a narrow connecting portion extending from a fixing portion for fixing a rotor to a shaft is provided.
In a motor with a cooling fan provided with a fan composed of a wing provided at the end of the connecting portion, the wing is located outside a bearing that rotatably supports the shaft.

According to a second aspect of the present invention, in the motor with a cooling fan according to the first aspect, an intake port is provided through the worm housing to form a first communication passage communicating the yoke housing and the worm housing. A second communication passage communicating with the first communication passage was formed in the brush holder, an exhaust port was provided in the yoke housing, and the fan was brought close to the end face of the rotor.

According to a third aspect of the present invention, in the motor with a cooling fan according to the first or second aspect, the blade portion extends in a direction facing the rotor. According to a fourth aspect of the present invention, in the motor with the cooling fan according to any one of the first to third aspects, a groove is formed in the worm housing along the shaft.

According to a fifth aspect of the present invention, in the motor with the cooling fan according to the fourth aspect, the fan is located between the rotor and the exhaust port. (Operation) According to the first aspect of the present invention, the fan includes a narrow connecting portion extending from a fixing portion for fixing the rotor to the shaft, and a blade disposed at a tip of the connecting portion. And a part. Moreover, since the wing portion is located outside the bearing, the shaft does not become long.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the operation described in the above, the fan is close to the end face of the rotor. For this reason, the windings of the rotor, which are heat sources,
The air is introduced from the intake port and is cooled by external air passing through the first and second communication passages. Then, the air is exhausted to the outside from the exhaust port.

According to the invention described in claim 3, according to claim 1 of the present invention,
Alternatively, in addition to the function described in claim 2, the wing portion extends in a direction facing the rotor. Therefore, when the fan is rotated, external air is introduced into the yoke housing from the air inlet through the first and second communication passages. Then, the air is exhausted to the outside from the exhaust port.

According to the invention described in claim 4, according to claim 1,
In addition to the functions described in any one of the third to third aspects, air introduced from the outside is introduced into the yoke housing via a groove formed in the worm housing. Then, the air is exhausted to the outside from the exhaust port.

According to the invention described in claim 5, according to claim 4,
In addition to the operation described in the above, the external air introduced through the groove directly cools, for example, the windings and brushes of the rotor serving as a heat source.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the housing 10 of the motor 1 with a cooling fan includes a yoke housing 20 and a worm housing 40. The worm housing 40 has an air inlet 41 through which air from the outside is introduced into the worm housing 40.

A first communication passage 42 is formed at a joint of the worm housing 40 joined to the yoke housing 20. A pair of magnets 21 are provided in the yoke housing 20. A rotor 22 is provided in the magnet 21. The rotor 22
A shaft 23 is provided. The shaft 23 is rotatably supported by bearings 24 and 25 disposed on the yoke housing 20 and the worm housing 40, respectively.

A commutator 26 is provided at one end of the shaft 23. The brush holder 27 has a brush holding portion 27 a for holding the brush 28. The brush holder 27 also has a second communication passage 27b for communicating the first communication passage 42 with the inside of the yoke housing 20.
Are formed. The commutator 26 and the brush 28 are slidably provided. Also, shaft 2
A worm 29 is connected to one end of 3. The worm 29 and the worm wheel 30 constitute a worm gear.

On the other hand, a fan 31 is attached to the other end of the shaft 23. The yoke housing 20 near the fan 31 is provided with a plurality of exhaust ports 32 for exhausting the air in the yoke housing 20 to the outside. For this reason, with the rotation of the rotor 22, the fan 31
Is rotated, the air in the yoke housing 20 is exhausted to the outside. At this time, external air is introduced from the air inlet 41 provided through the worm housing 40, and the external air is introduced into the yoke housing 20 through the first and second communication passages 42 and 27b. Then, the air passes through the yoke housing 20 and is exhausted from the plurality of exhaust ports 32 to the outside.

Next, the configuration of the fan 31 will be described with reference to the drawings. As shown in FIG. 2, the fan 31 includes a narrow connecting portion 52 extending from a fixing portion 51 for fixing the rotor 22 to the shaft 23, and a wing portion provided at a tip of the connecting portion 52. 53. Therefore, the shaft 23 is only extended by the width of the narrow connecting portion 52 extending from the fixed portion 51. Therefore, the motor 1 with the cooling fan does not increase in size.

Further, the wing portion 53 extends in a direction corresponding to the rotor 22. In other words, it extends toward the exhaust port 32. Therefore, the external air introduced from the intake port 41 is reliably exhausted from the exhaust port 32.

As described above, according to the present embodiment, the following operations and effects can be obtained. (1) The fan 31 has a narrow connecting portion 52 extending from a fixing portion 51 for fixing the rotor 22 to the shaft 23.
And a wing 53 provided at the end of the connecting portion 52. For this reason, the shaft 23 has a length corresponding to the width of the narrow connecting portion 52 extended from the fixed portion 51.
Only lengthens. Therefore, the motor 1 with the cooling fan does not increase in size. Therefore, even the motor 1 with a cooling fan can be downsized.

(2) When the fan 31 is rotated along with the rotation of the rotor 22, external air is introduced from the air inlet 41 provided in the worm housing 40, and the external air is supplied to the first and the second air outlets. It is introduced into the yoke housing 20 via the two communication paths 42 and 27b. And the air is
Air is exhausted from an exhaust port 32 provided in the yoke housing 20. For this reason, the windings of the rotor 22 and the brushes 28, which are heat sources, are cooled by external air.
As a result, the cooling effect can be improved.

(3) The connecting portion 52 of the fan 31 is close to the end face of the rotor 22. Therefore, when the fan 31 rotates with the rotation of the rotor 22, heat from the windings of the rotor 22 is also exhausted. Therefore, heat from the windings of the rotor 22, which is one of the heat sources, can also be efficiently exhausted.

(4) The wing portion 53 extends in a direction corresponding to the rotor 22. In other words, it extends toward the exhaust port 32. Therefore, the external air introduced from the intake port 41 is reliably exhausted toward the exhaust port 32. Therefore, the air in the yoke housing 20 can be efficiently exhausted from the exhaust port 32 to the outside.

(5) A first communication path 42 is formed at the joint of the worm housing 40. Further, the brush holder 27 has a second communication passage 2 communicating with the first communication passage 42.
7b is formed. For this reason, both housings 20,
The inside of 40 is communicated via the first and second communication passages 42 and 27b. As a result, the air introduced from the intake 41 is
It is introduced into the yoke housing 20 via the first and second communication passages 42 and 27b. At this time, the air introduced from the outside passes around the brush 28. Therefore, the periphery of the brush 28 can be reliably cooled by the air introduced from the outside.

(6) The wing portion 53 includes the rotor 22 and the exhaust port 3
It is located between the two. For this reason, the core, the windings, and the like that constitute the rotor 22 that is a heat source can be efficiently cooled.

(7) The intake port 41 for introducing outside air is provided through the worm housing 40. Therefore, even if water or the like enters through the intake port 41, there is no possibility that the contact portion between the commutator 26 and the brush 28 will be adversely affected. Moreover, if the cooling fan-equipped motor 1 is disposed in a direction in which the intake port 41 does not face upward (for example, downward), adverse effects can be reliably prevented. Therefore, even when the motor 1 with the cooling fan is provided in an automobile or the like, there is no possibility that any adverse effect occurs.

The present embodiment can be embodied with the following modifications. A groove for introducing air from the intake port 41 into the yoke housing 20 may be provided in the worm housing 40 along the shaft 23. With this configuration, the brush 28 and the like located near the extension of the shaft 23 can be efficiently cooled.

In addition, the groove provided in the worm housing 40 and the first and second communication passages 4 in the above-described embodiment.
2, 27b may be provided.

[0029]

Since the present invention is configured as described above, it has the following effects. According to the first aspect of the present invention, even a motor with a cooling fan can be downsized.

According to the invention described in any one of claims 2 to 5, the cooling effect can be improved in addition to the effect of the invention described in claim 1.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a motor with a cooling fan.

FIG. 2 is a sectional view showing a configuration of a fan.

[Explanation of symbols]

1 ... motor with cooling fan, 20 ... yoke housing,
22 ... rotor, 23 ... shaft, 24, 25 ... bearing, 2
7b: second communication path, 28: brush, 31: fan, 32
... exhaust port, 40 ... worm housing, 41 ... intake port,
42: first communication path, 51: fixed part, 52: connecting part, 53
... Hanebe.

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Claims (5)

[Claims] 1. A cooling fan comprising a fan comprising a narrow connecting portion extending from a fixing portion for fixing a rotor to a shaft, and a wing portion provided at a tip of the connecting portion. A motor with a cooling fan, the wings of which are located outside a bearing that rotatably supports a shaft. 2. The motor with a cooling fan according to claim 1, wherein an intake port is provided through the worm housing to form a first communication passage communicating the yoke housing and the worm housing. A motor with a cooling fan, wherein a second communication passage communicating with the cooling fan is formed in the brush holder, an exhaust port is provided in the yoke housing, and the fan is close to an end face of the rotor. 3. The motor with a cooling fan according to claim 1, wherein the blades extend in a direction facing the rotor. 4. The motor with a cooling fan according to claim 1, wherein a groove is formed in a worm housing along a shaft. 5. The motor with a cooling fan according to claim 4, wherein the fan is located between the rotor and an exhaust port.