JP2002027709A - Cooling structure of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool a heat generating portion of the main body of a motor provided at one end of an output shaft by sucking the air from the other end. SOLUTION: A motor case 15 provided at a base 11 of a blower unit 10 is provided with a flow path forming portion 30 to form an air flow path 29 to guide a cooling air to a brush 28, and a commutator 25 located at the position within the blower case 13 from the end of the motor case 15. Owing to this air flow path 29, the cooling air is guided in direct to the brush 28 and commutator 25 to which the cooling air cannot be supplied in direct from the inside of the blower case 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor cooling structure for a motor device such as a blower unit used in a vehicle air conditioner.

[0002]

2. Description of the Related Art Conventionally, in many cases, a brush type DC motor is used as a drive source in a blower unit of a vehicle air conditioner. Since the blower unit is continuously operated at a high output, frictional heat is generated due to sliding contact between the brush and the commutator, and the temperature of the motor increases mainly around the brush and the commutator. Therefore, it is necessary to cool the motor body in order to suppress the abrasion of the brush due to the temperature rise to secure the life, and to suppress the increase in the contact resistance to prevent the output from lowering.

For this reason, for example, in a vehicle blower disclosed in Japanese Utility Model Application No. 5-64290, a blower member 52 is provided between a blower case 50 and a motor housing 51 as shown in FIG.
To send the cooling air from the blower case 50 to the motor housing 51.

[0004]

However, in the above-described air blower for a vehicle, since only cooling air is supplied into the space 54 provided between the motor accommodating portion 51 and the motor 53, heat is generated. The source brush and commutator cannot be cooled effectively. For this reason, it was not possible to effectively suppress brush wear and output reduction.

[0005] In the brush type DC motor, noise is generated due to sliding contact between the brush and the commutator. Therefore, many blower units use a DC motor provided with a brush and a commutator on the fan side and arrange a noise generation source in a blower case to shield the noise. However, in the structure of the above-described vehicle blower, it is not possible to cool the brush and the commutator by directly introducing cooling air from the blower case into the motor body. Therefore, the brush and the commutator cannot be effectively cooled.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a motor body having a heat generating portion at one end of an output shaft and a motor body having the other end of the output shaft at the other end. It is an object of the present invention to provide a motor cooling structure of a motor device that can take in air from a motor and effectively cool the air.

[0007]

According to a first aspect of the present invention, there is provided a motor cooling structure for a motor device in which a motor body has a heat generating portion at one end of an output shaft thereof. A gist of the invention is that a flow path forming part for forming an air flow path for introducing cooling air from the other end side of the output shaft and guiding the cooling air to the heating part is provided on the outer peripheral side of the main body.

According to the first aspect of the present invention, the heat generated from the other end to the one end of the output shaft passes through the air flow path formed by the flow path forming portion provided on the outer peripheral side of the motor body. The cooling air is guided to the section.

According to a second aspect of the present invention, in the first aspect, the motor is a brush type DC motor, and the heat generating portion is a brush and a commutator.

According to the second aspect of the present invention, the first aspect is provided.
In addition to the operation of the invention described in (1), the brush and the commutator at one end of the output shaft are cooled by the cooling air introduced from the other end of the output shaft to the motor body. Therefore, the temperature rise of the brush and the commutator is suppressed. As a result, abrasion of the brush due to temperature rise is suppressed, and the life is prolonged. Further, an increase in contact resistance is suppressed, and a decrease in output is suppressed.

According to a third aspect of the present invention, in the second aspect of the present invention, the air flow path is provided inside the motor main body through an air discharge port provided on an outer peripheral side of the brush. And an air guide section for guiding cooling air discharged from the air discharge port to the brush side.

According to the invention described in claim 3, according to claim 2,
In addition to the effects of the invention described in (1), the cooling air is discharged from the air passage to the outer peripheral side of the brush, and is guided to the brush side and further to the commutator by the air guiding portion. Therefore, the brush and the commutator are more effectively cooled.

According to a fourth aspect of the present invention, in the second or third aspect of the present invention, the air flow path opens downward when the motor device is installed in a predetermined posture. The gist of the invention is to introduce air from outside of the motor body through an air intake port provided in the motor body.

According to the invention described in claim 4, according to claim 2,
Alternatively, in addition to the function of the invention described in claim 3, water is unlikely to enter the motor main body from the air intake port when the motor device is installed. Therefore, the motor body is unlikely to be affected by water that has entered from the outside.

According to a fifth aspect of the present invention, in the motor device according to any one of the second to fourth aspects, the motor device has a centrifugal fan fixed to one end of the output shaft. It is a blower unit in which the motor main body is fixed to a housing that houses a fan, wherein the brush and the commutator are arranged in the housing.

According to the invention set forth in claim 5, according to claim 2,
In addition to the operation of the invention described in any one of the above-described claims, the brush and the commutator are arranged in the housing in which the centrifugal fan fixed to one end of the output shaft of the motor body is housed. The noise generated by the sliding contact between the brush and the commutator is shielded. In the blower unit having such a configuration, the brush and the commutator are cooled by the cooling air introduced from the other end of the motor body. As a result, it is possible to effectively cool the brush and the commutator arranged in the housing in order to reduce noise generated in the motor body.

According to a sixth aspect of the present invention, in the first aspect of the present invention, the air flow path is provided between the other end of the output shaft and the heat generating portion. The gist is formed so as to extend in the axial direction.

According to the invention of claim 6, according to claim 1,
The cooling air moves from the other end of the output shaft to the one end in the shortest distance, so that more cooling air is supplied to the heat generating portion side. Is done. Therefore, the cooling efficiency becomes higher.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the motor body is provided with air inside the motor body on an outer peripheral side of the heat generating portion. The gist of the present invention is to provide an air discharge hole for communicating the inside of the motor body with the outside so that the air can be discharged to the outside.

According to the invention of claim 7, according to claim 1,
In addition to the effect of the invention according to any one of claims 6 to 6, since the air that has cooled the heat generating portion is discharged from the cooling air discharge hole to the outside of the motor main body, more air is discharged through the air flow path. Cooling air is supplied to the heating section. Therefore, the heat generating portion is cooled by more cooling air.

According to an eighth aspect of the present invention, in the first aspect of the present invention, the motor body includes a motor case portion provided in a housing of the motor device as a case. The gist is that the flow path forming portion is formed in the motor case portion.

According to the invention described in claim 8, claim 1 is provided.
In addition to the operation of the invention according to any one of the above-described claims, the present invention can be implemented only by providing the flow path forming portion in the motor case portion, so that new parts are not required. Further, unlike the case where the motor alone is fixed to the motor accommodating portion provided in the housing, there is no need to form an air discharge port in the motor case.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment in which the present invention is embodied in a blower unit of a vehicle air conditioner will be described below with reference to FIGS.
It will be described according to. 1 is a schematic cross-sectional view taken along line CC of FIG. 2, FIG. 2 is a schematic cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a schematic front view taken along line BB of FIG.

As shown in FIG. 1, a blower unit 10 as a motor device includes a base 11, a motor unit 12 as a motor body, a blower case 13, a blower fan 14 as a centrifugal fan, and the like. In the present embodiment, the base 1
1 and the blower case 13 constitute a housing.

The base 11 is integrally formed of synthetic resin and has a substantially cylindrical motor case 15 serving as a case of the motor 12.
And a flange-shaped case supporting portion 16 formed on the outer peripheral side of the motor case portion 15. Motor case 15
Has one end in the axial direction as a closed end 15a and the other side as an open end 15b. Case support 16
Is provided substantially at the center of the motor case 15 in the direction of the central axis.

The motor section 12 includes a motor case section 15, a cylindrical yoke 17, a pair of field magnets 18, an end face member 19,
It comprises an output shaft 20, an armature 21, and the like. The yoke 17 is fixed to the inner peripheral surface of the motor case 15. The pair of field magnets 18 are fixed to the inner peripheral surface of the yoke 17. The end member 19 is fixed to the opening end 15b of the motor case 15, and a brush device 22 is provided inside the end member 19. The output shaft 20 has a base end 20a as the other end.
Bearing 2 held at closed end 15a of motor case portion 15
3, and the end portion 20 b side as one end thereof is supported by a bearing 24 held by the end face member 19. The output shaft 20 has a distal end portion 20b that extends through the end face member 19 to the outside. The armature 21 provided on the output shaft 20 has a commutator 25 on the end face member 19 side.

As shown in FIGS. 1 and 4, the end face member 19 is
The bearing 24 is held, and the open end 15 b of the motor case 15 is held.
And a base 26 fixed to the base. Inside the base 26, the brush device 2 arranged on the outer peripheral side of the commutator 25
2 are provided.

The brush device 22 is provided as a pair on both sides of the output shaft 20. Each brush device 22
The brush holder 27 includes a brush holder 27 provided integrally with the base 26 and a brush 28 held by the brush holder 27. The brush device 22 is provided so that most of the brush device 22 is located outside the opening end 15b in the axial direction of the output shaft 20. In the present embodiment, the commutator 25 and the brush 28 are heat generating parts.

As shown in FIG. 1, the case support 16
, The blower case 13 is fixed to the motor case 15 at the opening end 15b side. A blower fan 14 fixed to the tip of the output shaft 20 is housed in the blower case 13. The blower fan 14 is, for example, a sirocco fan, and has an output shaft 2 such that the brush 28 and the commutator 25 are arranged in a concave portion 14a at the center thereof.
0 is fixed to the front end portion 20b.

Hereinafter, a characteristic configuration of the present embodiment will be described. As shown in FIGS. 1, 2, and 3, cooling air is introduced into the motor case 15 from the base end 20 a side of the output shaft 20 and extends along the outer peripheral surface of the motor 12 to the brush device 22 which is a heating unit. A flow path forming portion 30 that forms an air flow path 29 for guiding is provided integrally on both sides of the output shaft 20.
Each air passage 29 is formed so as to extend in the axial direction of the output shaft 20. In addition, each air flow path 29 is connected to the output shaft 2.
The brush holder 27 is provided so as to overlap the outer peripheral position of each brush holder 27 when viewed in the direction of the axis 0.

On the closed end 15a side of the motor case section 15, an air intake port 31 for taking in cooling air from outside the motor section 12 into each air flow path 29 is provided. Each air flow path 29 is communicated with the air intake port 31 via an air intake path 32 that extends downward from both sides of the base end portion 20a of the output shaft 20 and merges.

As shown in FIG. 2, the air inlet 31 opens downward when the blower unit 10 is installed so that the two brush devices 22 are located on both sides of the output shaft 20 on a horizontal plane. It is provided in. This prevents water droplets from entering the air flow path 29 from the air intake port 31 when the blower unit 10 is correctly installed in a predetermined posture, and enters the motor section 12 through the air flow path 29. This is to prevent it.

The open end 15b of the motor case 15
Are provided with air discharge ports 29a for discharging the cooling air from the air flow paths 29, respectively. Each of the air discharge ports 29a is located at the tip 2 in the axial direction of the output shaft 20.
It is formed so as to open toward the 0b side.

On the other hand, the brush holding unit 27 is
It is formed in a substantially rectangular cylindrical shape extending along a straight line intersecting the coaxial line on a plane including the zero axis. Further, the brush holding portion 27 is formed so as to extend in an inclined state with respect to a plane orthogonal to the axis of the output shaft 20 so that the inner peripheral portion thereof is located closer to the distal end portion 20b. On the base 26 side of the brush holding portion 27, an extension piece 33 as an air guiding portion extending in a plate shape to an outer peripheral position is integrally provided. The extension piece 33 is provided at the base 2 of the conventional brush holding portion.
It is formed by extending the wall on the 6 side.

Each of the air discharge ports 29a is open to the extended piece 33 of the brush holding portion 27 of the brush device 22 so as to face the inside of the outer peripheral portion. On the other hand, each extension piece 33 is inclined by the inclination of the air discharge port 2.
The cooling air discharged from 9a is guided to the brush holding portion 27 and further to the commutator 25 side.

The end member 19 is, as shown in FIG.
In a state fitted and fixed to the opening end 15b of the motor case portion 15, a plurality of communication devices that communicate the inside of the motor portion 12 with the outside so that air in the motor portion 12 can be discharged to the outside on the outer peripheral side of each brush device 22. An air discharge hole 34 is formed between the air case 34 and the motor case 15. Each air discharge hole 34 is formed so as to extend in the circumferential direction with respect to the output shaft 20 including the outer peripheral side of each brush holding portion 27.

Next, the operation of the cooling structure of the blower unit configured as described above will be described. Motor unit 12
Is operated to drive the blower fan 14, air is discharged from the blower case 13, so that the space in the concave portion 14a becomes negative pressure. Therefore, the air in the motor unit 12 is discharged from each air discharge hole 34 into the blower case 13.

Then, a negative pressure is generated in the motor section 12, so that the blower unit 10 has a negative pressure as shown by arrows in FIGS.
Is taken into the air flow path 29 through the air intake port 31 and the air intake path 32. Then, the taken-in air is guided by the air flow path 29 and moves toward the distal end portion 20b in the axial direction of the output shaft 20, and is discharged from the air discharge port 29a as shown by an arrow in FIG. Hits the extension piece 33 without changing.

The cooling air impinging on the extension piece 33 is supplied to the extension piece 33 inclined with respect to a plane perpendicular to the axis, and further along the brush holding portion 27 to the inner peripheral side of the brush 28 and the commutator 25.
The brush 28 further cools the commutator 25. The cooling air that has cooled each brush 28 and commutator 25 is discharged into the blower case 13 from each air discharge hole 34.

As a result, the brush 28 and the commutator 25 provided on the distal end portion 20 b of the output shaft 20 and disposed in the blower case 13 are connected to the outside of the motor portion 12 on the base end portion 20 a side of the output shaft 20. Cooled by air taken in from

According to the present embodiment described in detail above, the following effects can be obtained. (1) The brush 28 and the commutator 25 provided on the end portion 20b side of the output shaft 20 of the motor portion 12 are
In the blower unit 10 disposed in the inside 3, a flow path that forms an air flow path 29 that guides cooling air from the base end 20 a side of the output shaft 20 to the brush 28 and the commutator 25 on the outer peripheral side of the motor section 12. The forming part 30 was provided. Therefore, the brush 28 and the commutator 25 to which the cooling air cannot be directly supplied from the blower case 13 are effectively cooled by the air outside the blower case 13. As a result, it is possible to suppress abrasion of the brush 28 due to a rise in temperature, to secure a longer life, and to further suppress an increase in contact resistance to prevent a decrease in output.

Also, unlike the case where cooling air is guided to the brushes 28 and the commutator 25 by passing the inside of the motor from the base end 20a side of the output shaft 20, contact with the armature 21 where the temperature becomes high. There is no. For this reason, since the cooling air can be supplied at a lower temperature, the cooling can be more effectively performed.

(2) The air discharge port 29a of the air flow path 29
Is provided on the outer peripheral side of each brush 28 and commutator 25, and an extension piece 33 for guiding cooling air discharged from the air discharge port 29 a to the brush 28 and commutator 25 side is provided on the brush holding portion 27. Therefore, the cooling air introduced into the motor unit 12 from the air flow path 29 is guided more by the extension piece 33 to the brush 28 and the commutator 25 side.
The brush 28 and the commutator 25 are cooled more effectively.

Further, since the extension piece 33 is formed by extending a part of the conventional brush holding portion, no new parts are required. (3) The two air passages 29 are provided in the blower unit 10
The cooling air is introduced from the outside of the motor unit 12 through the air intake port 31 that opens downward when the camera is installed in a predetermined posture. Therefore, it is difficult for water to enter the air flow path 29 from the air intake port 31 and the air flow path 29
Water hardly penetrates into the motor unit 12 through the motor.

(4) The air passage 29 is formed so as to extend in the axial direction from the base end 20a of the output shaft 20 to the position of the brush 28. Therefore, the cooling air taken into the air flow passage 29 moves linearly and does not collide with the armature or the like as in the case where the cooling air passes through the inside of the motor, so that the flow velocity thereof is not easily reduced. As a result, more cooling air is supplied to the brush 28 side, so that the brush 28 and the commutator 25 can be cooled more effectively.

(5) Each of the brushes 28
An air discharge hole 34 is provided on the outer peripheral side of the air discharge port so as to allow air in the motor section 12 to be discharged to the outside. With this configuration, the air that has cooled the brushes 28 is discharged from the air discharge holes 34 to the outside of the motor unit 12, so that the cooling air is effectively supplied to the brushes 28 and the commutator 25 from the air flow path 29. Therefore, each brush 28 and commutator 25 can be cooled more effectively.

(6) Using the motor case 15 provided on the base 11 of the blower unit 10 as a case,
And a flow path forming portion 30 was formed in the motor case portion 15. Therefore, the present invention can be implemented simply by forming the flow path forming portion 30 in the conventional motor case portion, and since it does not require new parts, it can be easily implemented.

Hereinafter, embodiments other than the above-described embodiment embodying the present invention will be listed as other examples. In the above embodiment, a flow path forming an air introduction path for introducing the positive pressure air generated in the blower case 13 into the air flow path 29 between the blower case 13 and the air intake 31. A member may be provided. In this configuration, since the cooling air of the positive pressure is supplied to the brush 28 and the commutator 25, the brush 28 and the commutator 25 can be cooled more effectively.

In the above embodiment, the motor body is not fixed to the motor housing 12 provided in the base 11, but to the integrated motor portion 12 in which the motor case is formed by the motor case 15 provided in the base 11. It may be a single motor that is only operated. In this case, the groove formed in the motor accommodating portion and the outer peripheral surface of the motor case of the single motor may constitute a flow path forming section that forms an air flow path. Alternatively, a flow path forming section that forms an air flow path may be provided in the motor housing section itself. In the former case, an air discharge port for discharging cooling air from the air flow path to the brush 28 side is formed in the outer peripheral surface of the motor case of the single motor, and in the latter case, the motor housing portion and the outer peripheral surface of the motor case are formed. May be provided with air outlets.

In the above embodiment, the air intake 31
Is from the distal end 20b to the proximal end 2 in the axial direction of the output shaft 20.
It may be provided so as to open in the direction of 0a. In the above embodiment, the air discharge port 29a is the brush 2
8 may be provided so as to open inward in the radial direction at the outer periphery of 8. Even with this configuration, the brush 28 and the commutator 25 can be cooled more effectively.

In the above embodiment, the centrifugal fan may be a turbo fan. In the above embodiment, the motor may be a brushless motor, and the heat generating portion may be a semiconductor switch.

In the above embodiment, the blower unit 1
0 may be a blower unit other than the vehicle air conditioner, such as a ship air conditioner, construction equipment air conditioner, aircraft air conditioner, or the like.

In the above embodiment, the blower unit may be a blower unit other than the one for the air conditioner, for example, for cooling electronic devices, for cooling machine tools, and the like. In the above embodiment, the motor device may be a motor device other than the blower unit, for example, for driving a work jig, for driving a specimen to rotate, or the like. Each motor device may be provided with a fan for sending cooling air to the air flow path or a fan for forcibly discharging air having cooled the heat generating portion.

Hereinafter, the technical ideas grasped from each of the above embodiments will be described together with their effects. (1) In the motor cooling structure for a motor device according to any one of claims 5 to 8, a positive pressure generated in the housing is provided between the housing and the air intake port. A motor cooling structure of a motor device provided with a flow path forming member that forms an air introduction path for introducing air into the air flow path. According to such a configuration, since the cooling air of the positive pressure is supplied to the heat generating portion, the heat generating portion can be cooled more effectively.

(2) A motor device comprising the motor cooling structure of the motor device according to any one of claims 1 to 8. (3) A blower unit comprising the motor cooling structure of the motor device according to any one of claims 5 to 8.

[0056]

According to the first to eighth aspects of the present invention, the heat generating portion at one end of the output shaft in the motor body is taken into the motor main body from the other end of the output shaft. Cooling.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a blower unit of a vehicle air conditioner.

FIG. 2 is a schematic cross-sectional view taken along line AA in FIG.

FIG. 3 is a schematic front view taken along the line BB in FIG. 1;

FIG. 4 is a schematic front view showing an end member.

FIG. 5 is a schematic sectional view showing a conventional blower unit.

[Explanation of symbols]

Reference numeral 10 denotes a blower unit as a motor device, 11 ... a base part constituting a housing, 12 ... a motor part as a motor body, 13 ... a blower case constituting a housing, 14
... Blower fan as centrifugal fan, 20 ... Output shaft,
20a: a base end as the other end; 20b, a distal end as one end; 25, a commutator as a heat generating part; 28, a brush; 29, an air flow path; 29a, an air discharge port; Reference numeral 31 denotes an air intake, 33 denotes an extension piece as an air guide, 34 denotes an air discharge hole.

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Claims (8)

[Claims] A motor body (12) has an output shaft (2).
0), the motor cooling structure of the motor device having a heat generating portion (25, 28) on one end (20b) side, wherein the output shaft (2)
0) from the other end (20a) side to introduce the cooling air and guide it to the heat generating portion (25, 28).
A motor cooling structure for a motor device, comprising a flow path forming portion (30) for forming (9). 2. The motor cooling structure for a motor device according to claim 1, wherein the motor body is a brush type DC motor, and the heat generating portion is a brush and a commutator. A motor cooling structure for a motor device, characterized in that: 3. The motor cooling structure of a motor device according to claim 2, wherein the air flow path (29) is provided via an air discharge port (29a) provided on an outer peripheral side of the brush (28). A motor provided with an air guide (33) for discharging cooling air into the motor body (12) and guiding cooling air discharged from the air discharge port (29a) to the brush (28) side. Motor cooling structure of equipment. 4. The motor cooling structure for a motor device according to claim 2, wherein the air flow path (29) is provided in a state where the motor device (10) is installed in a predetermined posture. Motor cooling of a motor device, wherein air is introduced from outside the motor body (12) through an air intake port (31) provided in the motor body (12) so as to open toward the motor body (12). Construction. 5. The motor cooling structure for a motor device according to claim 2, wherein the motor device (10) includes one end (2) of the output shaft (20).
0b), a blower unit (1) having a centrifugal fan (14) fixed thereto and the motor body (12) fixed to housings (11, 13) accommodating the centrifugal fan (14).
0) wherein said brush (28) and commutator (25)
Is a motor cooling structure for a motor device, wherein the motor cooling structure is disposed in the housing (11, 13). 6. The motor cooling structure for a motor device according to claim 1, wherein the air passage (29) is located on the other end (20a) side of the output shaft (20). A motor cooling structure for a motor device, wherein the motor cooling structure is formed so as to extend in the axial direction between the heat generating portion and the heat generating portion. 7. The motor cooling structure for a motor device according to claim 1, wherein the heat generating section (25, 2) is provided on the motor body (12).
An air discharge hole (34) for communicating the inside of the motor main body (12) with the outside so that air inside the motor main body (12) can be discharged to the outside is provided on the outer peripheral side of (8). Motor cooling structure of the motor device. 8. The motor cooling structure for a motor device according to claim 1, wherein the motor body (12) is provided on a housing (11, 13) of the motor device (10). Motor case (1
5) is configured as a case, and the flow path forming section (30) is configured to include the motor case section (1).
5) A motor cooling structure for a motor device, which is formed in 5).