Fan unit

Abstract

To provide a fan apparatus that generates cooling air for cooling an object while appropriately cooling a motor, without increasing the size of the fan apparatus.SOLUTION: A fan apparatus (1) comprises: a shroud (4) including a motor support part (42); a fan (3) disposed on a front side of the motor support part (42); and a motor (2) supported on a rear side of the motor support part (42). The motor support part (42) has a plurality of air channels (426) that are circumferentially disposed away from a boss 31 of the fan (3) in an outer radial direction and each of which penetrates in the thickness direction. The fan apparatus (1) also comprises an air passage (52) that is disposed on the rear side of the motor support part (42) to face the air channels (426) and guides cooling air, which has been generated by the fan (3) and passed through the air channels (426), to a rear side of a motor bracket (21).SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a fan device that generates cooling air. [Background technology]

[0002] In recent years, efforts have been made to promote the Sustainable Development Goals (2030 Agenda for Sustainable Development, adopted at the United Nations Summit on September 25, 2015, hereafter referred to as "SDGs"). Accordingly, technologies that aim to reduce waste and defective products in order to ensure sustainable production and consumption patterns have become well known.

[0003] 2. Description of the Related Art Conventionally, a fan device for supplying cooling air to a radiator has been known that integrates a fan for generating cooling air, a motor for rotating the fan, and a shroud for supporting the fan and the motor.

[0004] In a fan device with the above configuration, the motor itself generates heat, so in addition to supplying cooling air to the radiator, measures to cool the motor are also necessary. For example, Patent Document 1 discloses a configuration in which part of the heat shield covering the back surface of the motor is extended radially outward to guide part of the cooling air generated by the fan to the motor. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-52576 Summary of the Invention [Problem to be solved by the invention]

[0006] In the configuration of Patent Document 1, the heat shield plate, which extends significantly outward in the radial direction, blocks the flow of cooling air passing through the fan device. Therefore, in order to ensure the cooling air necessary to cool the radiator, measures such as increasing the diameter of the fan are necessary.

[0007] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a fan device that can ensure the cooling air necessary to cool an object to be cooled and can also properly cool a motor without increasing the size of the fan device. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a motor including a motor bracket, a rotor rotatably supported on the front surface of the motor bracket, a stator fixed to the front surface of the motor bracket and wound with a coil that generates a magnetic field for rotating the rotor, and a driver circuit fixed to the rear surface of the motor bracket and controlling the generation of the magnetic field by the coil; a fan including a boss fixed to the rotor and blades that each protrude radially outward from a circumferentially spaced position on the outer circumferential surface of the boss; a shroud body formed with a fan accommodating hole that accommodates the fan; and a shroud having a plurality of stays extending radially from the motor support part toward the shroud body, wherein the fan is disposed on the front side of the motor support part, and the motor is supported on the back side of the motor support part, and the motor support part is formed with a plurality of air guide passages each penetrating in the thickness direction at positions radially outward from the boss and spaced apart in the circumferential direction, and the fan device further comprises an air guide part disposed on the back side of the motor support part facing the air guide passages, and which guides cooling air generated by the fan and which has passed through the air guide passages toward the back side of the motor bracket. [Effects of the Invention]

[0009] According to the present invention, it is possible to obtain a fan device that can ensure the cooling air necessary to cool an object to be cooled and can also properly cool a motor without increasing the size of the fan device. Problems, configurations, and effects other than those described above will become clear from the description of the following embodiments. [Brief explanation of the drawings]

[0010] [Figure 1] 1A and 1B are external perspective views of the front side and rear side of the fan device. [Figure 2] FIG. 2 is an exploded perspective view of the fan device as seen from the front side. [Figure 3] FIG. 2 is an exploded perspective view of the fan device as seen from the rear side. [Figure 4] FIG. [Figure 5] 1A is a front view of the shroud, and FIG. 1B is a rear view of the shroud. [Figure 6] FIG. 6 is a cross-sectional view of the motor support portion taken along line VI-VI in FIG. 5(A). [Figure 7] 1A and 1B are perspective views of the front side and rear side of a heat shield plate. [Figure 8] FIG. 4 is a cross-sectional view of a main part of a motor support portion and a heat shield plate. DETAILED DESCRIPTION OF THE INVENTION

[0011] As one aspect of a fan device according to an embodiment of the present invention, a fan device 1 that is mounted on a vehicle such as an automobile and cools engine coolant flowing in a radiator (object to be cooled) will be described below.

[0012] (Overall configuration of fan device 1) First, the overall configuration of the fan device 1 will be described with reference to Figures 1 and 2. Figure 1 is an external perspective view of the front side (A) and back side (B) of the fan device 1. Figure 2 is an exploded perspective view of the fan device 1 as seen from the front side. Figure 3 is an exploded perspective view of the fan device 1 as seen from the back side. As shown in Figures 1 to 3, the fan device 1 mainly comprises a motor 2, a fan 3, a shroud 4, and a heat shield plate 5.

[0013] The fan device 1 is installed, for example, in the engine compartment so as to face the radiator in the front-to-rear direction. More specifically, in the engine compartment of a typical automobile, the radiator, fan device 1, and engine are arranged in this order from front to rear. In other words, the fan device 1 is arranged between the radiator and the engine in the front-to-rear direction. Hereinafter, the front side (radiator side) of the fan device 1 will be referred to as the "front side," and the rear side (engine side) of the fan device 1 will be referred to as the "rear side."

[0014] The shroud 4 is fixed to the engine compartment with bolts or the like. The shroud 4 supports the motor 2 and houses the fan 3 attached to the motor 2. The fan 3 generates cooling air from the front side to the back side of the fan device 1 when the driving force of the motor 2 is transmitted to it and rotates. The heat shield 5 covers the motor 2 from the back side, blocking radiant heat emitted from the engine and preventing it from reaching the motor 2.

[0015] As the fan 3 rotates, negative pressure is created in the front side of the fan unit 1 (i.e., the area where the radiator is installed). This creates a cooling airflow from the front to the rear in the area where the radiator is installed. The greater the volume of the cooling airflow passing through the fan unit 1 from the front to the rear, the greater the volume of the cooling airflow passing through the radiator.

[0016] (Motor 2 configuration) Next, the configuration of the motor 2 will be described with reference to Figure 4. Figure 4 is a longitudinal cross-sectional view of the motor 2. The motor 2 according to this embodiment is an outer rotor brushless motor. The motor 2 is a so-called "mechanically and electrically integrated" electric motor, in which a driver circuit 25 that controls the brushless motor is integrated. As shown in Figure 4, the motor 2 mainly includes a motor bracket 21, a shaft 22, a rotor 23, a stator 24, a driver circuit 25, a driver case 26, and a connector unit 27 (see Figures 2 and 3).

[0017] The motor bracket 21 has a generally plate-like outer shape and supports the components of the motor 2 (i.e., the shaft 22, rotor 23, stator 24, driver circuit 25, driver case 26, and connector unit 27) on the front or back side.

[0018] One axial end of the shaft 22 is fixed to the surface side of the motor bracket 21. Hereinafter, the axial direction of the shaft 22 will be simply referred to as the "axial direction," the radial direction about the axis of the shaft 22 will be simply referred to as the "radial direction," and the circumferential direction about the axis of the shaft 22 will be simply referred to as the "circumferential direction."

[0019] The rotor 23 is rotatably supported on the shaft 22 via bearings 22A and 22B on the surface side of the motor bracket 21. The rotor 23 has a plurality of permanent magnets 231 arranged at equal intervals in the circumferential direction so as to surround the outer periphery of the stator 24, and a rotor yoke 232 that covers the stator 24 and the plurality of permanent magnets 231. The rotor yoke 232 is arranged on the surface side of the motor bracket 21 so as to be concentric with the axis of the shaft 22. The rotor yoke 232 has an outer circumferential wall 232A, an inner circumferential wall 232B, and a connecting wall 232C.

[0020] The outer peripheral wall 232A has a cylindrical outer shape. The outer peripheral wall 232A is disposed radially outward of the stator 24. The inner peripheral surface of the outer peripheral wall 232A supports a plurality of permanent magnets 231. In other words, the plurality of permanent magnets 231 are fixed to the inner peripheral surface of the outer peripheral wall 232A at predetermined intervals in the circumferential direction.

[0021] The inner circumferential wall 232B has a cylindrical outer shape and is disposed radially inward of the stator 24. The inner circumferential wall 232B is rotatably supported by the shaft 22 via bearings 22A and 22B.

[0022] The connecting wall 232C has a disk-shaped outer shape. The connecting wall 232C connects the axial ends of the outer peripheral wall 232A and the inner peripheral wall 232B. More specifically, the connecting wall 232C connects the outer peripheral wall 232A and the inner peripheral wall 232B on the other axial end side of the shaft 22 (i.e., the side opposite the motor bracket 21).

[0023] The stator 24 is housed in a space surrounded by the outer peripheral wall 232A, the inner peripheral wall 232B, the connecting wall 232C, and the motor bracket 21. The stator 24 is fixed to the surface side of the motor bracket 21, radially inward of the multiple permanent magnets 231. The stator 24 faces the multiple permanent magnets 231 across a predetermined radial gap.

[0024] The stator 24 has a cylindrical stator core 241, a plurality of teeth 242 protruding radially outward from the stator core 241, and conductive coils 243 wound around the teeth 242 covered with insulating insulators. The stator 24 generates a magnetic field when a current flows through the coils 243. The rotor yoke 232 rotates about the axis of the shaft 22 due to attractive and repulsive forces generated between the magnetic field generated by the coils 243 and the plurality of permanent magnets 231.

[0025] The driver circuit 25 controls the generation of a magnetic field by the coil 243 by switching the timing of supplying current to the coil 243. The driver circuit 25 is composed of a circuit board and electronic components mounted on the circuit board. The driver case 26 is fixed to the rear side of the motor bracket 21 (i.e., the side opposite to the shaft 22, rotor 23, and stator 24). An accommodation space 28 is formed between the rear side of the motor bracket 21 and the driver case 26. The driver circuit 25 is housed in the accommodation space 28 formed on the rear side of the motor bracket 21.

[0026] 2 and 3, the connector unit 27 is attached to an end of the motor bracket 21. The connector unit 27 is an integrated unit of two connectors to which an external harness is connected. The driver circuit 25 is electrically connected to an external device (e.g., an automobile control device) via the connector unit 27.

[0027] (Fan 3 configuration) 1 to 3, fan 3 has boss 31 fixed to rotor yoke 232, a plurality of blades 32 (nine in this embodiment) each protruding radially outward from circumferentially spaced positions on the outer circumferential surface of boss 31, and a plurality of connecting members 33 (nine in this embodiment) connecting adjacent blades 32 at their tips. Fan 3 rotates integrally with rotor 23, with the axis of shaft 22 as the center of rotation.

[0028] Boss 31 includes a disk-shaped disk portion 311 and a cylindrical peripheral wall portion 312 that protrudes from the outer edge of disk portion 311 toward motor 2 and has a plurality of blades 32 attached thereto. When fan 3 is attached to motor 2, disk portion 311 faces connecting wall 232C of rotor yoke 232, and peripheral wall portion 312 surrounds outer peripheral wall 232A of rotor yoke 232. In other words, the inner diameter dimension of peripheral wall portion 312 of boss 31 is set slightly larger than the outer dimension of rotor yoke 232.

[0029] (Shroud 4 configuration) Fig. 5 is a front view (A) and a rear view (B) of the shroud 4. Fig. 6 is a cross-sectional view of the motor support part 42 taken along line VI-VI in Fig. 5(A). As shown in Figs. 5 and 6, the shroud 4 is made up of a shroud main body 41, the motor support part 42, and a plurality of stays 43 (11 in this embodiment). The shroud 4 is integrally molded, for example, by injection molding a resin material.

[0030] The shroud body 41 has a generally plate-like outer shape. A plurality of fixed portions 411 are provided on the outer peripheral surface of the shroud body 41 for fixing the shroud 4 (in other words, the fan device 1) to the inside of the engine room with bolts or the like. The shroud body 41 also has a fan accommodating hole 412 formed therethrough in the thickness direction. The fan accommodating hole 412 is a circular through-hole for accommodating the fan 3. In other words, the diameter of the fan accommodating hole 412 is set slightly larger than the outer dimension of the fan 3 (i.e., the diameter of an imaginary circle connecting the tips of the plurality of blades 32).

[0031] Furthermore, a plurality of reinforcing ribs 413 are formed on the front and rear surfaces of the shroud body 41. The reinforcing ribs 413 protrude from the front and rear surfaces of the shroud body 41 in the thickness direction and extend in any direction. As shown in FIG. 5(A), for example, the reinforcing ribs 413 on the front surface side of the shroud body 41 may be inclined radially outward in the opposite direction (counterclockwise) to the rotation direction (clockwise) of the fan 3 with respect to an imaginary line (dash-dotted line) that passes through the center of the fan housing hole 412 and extends in the radial direction. This allows the air on the front surface side of the shroud body 41 to flow smoothly into the fan housing hole 412, thereby increasing the amount of cooling air passing through the fan device 1.

[0032] The motor support portion 42 is disposed inside the fan accommodating hole 412 (more specifically, in the center of the fan accommodating hole 412) to support the motor 2. The motor support portion 42 has a generally arc-shaped outer shape. As shown in FIGS. 5 and 6 , the motor support portion 42 mainly includes an inner circumferential wall 421, an outer circumferential wall 422, a plurality of connecting walls 423, a motor fixing portion 424, and a heat shield fixing portion 425.

[0033] The inner circumferential wall 421 and the outer circumferential wall 422 have a generally arc-shaped outer shape. The outer circumferential wall 422 is disposed radially outward of the inner circumferential wall 421. That is, the inner circumferential wall 421 and the outer circumferential wall 422 are disposed at a predetermined distance in the radial direction. The inner diameter of the inner circumferential wall 421 is set slightly larger than the outer dimensions of the rotor yoke 232. The outer dimensions of the inner circumferential walls 421 and 422 are set slightly larger than the outer dimensions of the boss 31 (more specifically, the peripheral wall portion 312).

[0034] The connecting walls 423 connect the outer peripheral surface of the inner peripheral wall 421 and the inner peripheral surface of the outer peripheral wall 422 at positions spaced apart in the circumferential direction. As a result, the space surrounded by the outer peripheral surface of the inner peripheral wall 421, the inner peripheral surface of the outer peripheral wall 422, and the adjacent connecting walls 423 functions as an air guide passage 426 that penetrates the motor support part 42 in the thickness direction. In other words, the motor support part 42 is formed with a plurality of air guide passages 426 that each penetrates the thickness direction at positions spaced apart in the circumferential direction.

[0035] When the motor 2 and the fan 3 are attached to the shroud 4, the plurality of air guide passages 426 are located radially outward of the boss 31. In other words, when the shroud 4 is viewed from above in the thickness direction, the plurality of air guide passages 426 face the plurality of blades 32. As a result, the cooling air generated by the fan 3 (more specifically, the blades 32) passes through the air guide passages 426 from the front surface side to the back surface side of the motor support portion 42.

[0036] As shown in FIG. 6 , the outer peripheral surface of the inner peripheral wall 421 that defines the airflow passage 426 extends generally in the thickness direction of the motor support portion 42 (in other words, the shroud 4). Meanwhile, the inner peripheral surface of the outer peripheral wall 422 that defines the airflow passage 426 is inclined radially inward from the front surface side toward the rear surface side of the motor support portion 42. That is, the airflow passage 426 is inclined radially inward from the front surface side toward the rear surface side of the motor support portion 42. Furthermore, the opening area of ​​the airflow passage 426 on the rear surface side of the motor support portion 42 is set smaller than the opening area of ​​the airflow passage 426 on the front surface side of the motor support portion 42. That is, the opening area of ​​the airflow passage 426 gradually decreases from the front surface side toward the rear surface side of the motor support portion 42.

[0037] More specifically, the inner circumferential surface of the outer circumferential wall 422 that defines the air guide passage 426 is composed of a first surface 422A on the front surface side of the motor support portion 42, a second surface 422B on the rear surface side of the motor support portion 42, and a step 422C between the first surface 422A and the second surface 422B. The first surface 422A and the second surface 422B are both inclined radially inward from the front surface side to the rear surface side of the motor support portion 42. However, the inclination angle of the second surface 422B is set larger than the inclination angle of the first surface 422A. As a result, the opening area of ​​the air guide passage 426 gradually decreases in the region of the first surface 422A from the front surface side to the rear surface side of the motor support portion 42, and rapidly decreases in the region of the second surface 422B.

[0038] The motor fixing portion 424 is a portion through which a bolt for fixing the motor 2 to the motor support portion 42 is inserted. More specifically, the front side of the motor 2 is abutted against the rear side of the motor support portion 42. This causes the bolt holes in the motor bracket 21 to communicate with the bolt holes in the motor fixing portion 424. The motor 2 is supported on the rear side of the motor support portion 42 by threading a nut onto the tip of a bolt that passes through the communicating bolt hole. At this time, the rotor yoke 232 passes inside the inner circumferential wall 421 and protrudes toward the front side of the motor support portion 42. Furthermore, the fan 3 is attached to the motor 2 by placing a boss 31 over the rotor yoke 232 protruding toward the front side of the motor support portion 42 and fixing it with a bolt. In other words, the fan 3 is disposed on the front side of the motor support portion 42.

[0039] The heat shield plate fixing portion 425 is a portion through which a bolt for fixing the heat shield plate 5 to the motor support portion 42 is inserted. The heat shield plate 5 is arranged so as to cover the rear side of the motor 2 attached to the motor support portion 42. This allows the bolt holes 55 penetrating the heat shield plate 5 in the thickness direction to communicate with the bolt holes provided in the heat shield plate fixing portion 425. Then, by screwing nuts onto the tips of the bolts that pass through the communicating bolt holes, the heat shield plate 5 covering the rear side of the motor 2 is fixed to the motor support portion 42. Then, when the heat shield plate 5 is attached to the heat shield plate fixing portion 425, a space through which cooling air can circulate is formed between the driver case 26 and the heat shield plate main body 51.

[0040] The multiple stays 43 extend radially from the motor support portion 42 toward the shroud main body 41 at positions spaced apart in the circumferential direction. More specifically, the stays 43 connect the outer peripheral surface of the outer peripheral wall 422 to a surface of the shroud main body 41 that defines the fan accommodating hole 412. As a result, the motor support portion 42 is supported by the shroud main body 41 at the center of the fan accommodating hole 412.

[0041] (Configuration of heat shield plate 5) FIG. 7 is a perspective view of the front side (A) and back side (B) of the heat shield 5. FIG. 8 is a cross-sectional view of the motor support part 42 and the heat shield 5. The heat shield 5 is disposed between the motor 2 and the engine. This prevents infrared rays emitted from the engine from reaching the motor 2 (in other words, it blocks the engine's radiant heat). The heat shield 5 also discharges cooling air that is guided to the back side of the motor 2 through the air guide passage 426 and an air guide part 52, which will be described later. As shown in FIG. 7, the heat shield 5 mainly comprises a heat shield main body 51 and a plurality of air guide parts 52.

[0042] The heat shield body 51 has a generally flat plate-like outer shape. The heat shield body 51 is formed with a plurality of air exhaust holes 53 and a plurality of louvers 54. The air exhaust holes 53 are through-holes that penetrate the heat shield body 51 in the thickness direction. The air exhaust holes 53 according to this embodiment are elongated holes formed in the shape of slits. The air exhaust holes 53 exhaust the cooling air that is guided between the driver case 26 and the heat shield body 51 by the air guide section 52.

[0043] The louvers 54 are provided adjacent to the air exhaust holes 53. The louvers 54 are provided at an angle with respect to the thickness direction of the heat shield body 51. More specifically, the louvers 54 are inclined toward the front surface side of the heat shield body 51 (i.e., the motor 2 side). The louvers 54 control the discharge direction of the cooling air through the air exhaust holes 53. More specifically, the louvers 54 discharge the cooling air guided between the driver case 26 and the heat shield body 51 from the air exhaust holes 53 along the inclined surface of the louvers 54. Furthermore, as shown in FIG. 8, the opening area A1 of the air exhaust holes 53 when viewed from the thickness direction of the heat shield body 51 is set smaller than the opening area A2 of the air exhaust holes 53 when viewed obliquely along the inclination direction of the louvers 54.

[0044] The plurality of airflow guide sections 52 are provided on the outer edge of the heat shield plate main body 51. The airflow guide sections 52 are inclined toward the front surface side of the heat shield plate main body 51 (i.e., toward the motor support section 42). As shown in FIG. 8 , when the heat shield plate 5 is attached to the heat shield plate fixing section 425, the airflow guide sections 52 are disposed on the back surface side of the motor support section 42, facing the airflow passage 426. The airflow guide sections 52 are located radially inward from the outer peripheral wall 422. The airflow guide sections 52 guide the cooling air generated by the fan 3 and passing through the airflow passage 426 to the back surface side of the motor bracket 21 (in other words, to the space between the driver case 26 and the heat shield plate fixing section 425).

[0045] 8, the cooling air generated by fan 3 is inclined radially inward along the inner circumferential surface of outer circumferential wall 422 as it passes through air guide path 426, and accelerates as the opening area decreases. The cooling air that has passed through air guide path 426 is guided by air guide section 52 into the space between driver case 26 and heat shield plate fixing section 425. The air guided into the space between driver case 26 and heat shield plate fixing section 425 cools driver case 26 (more specifically, driver circuit 25), and then is discharged from air exhaust hole 53 along louver 54.

[0046] The heat shield 5 is integrally formed from, for example, a steel plate. That is, bolt holes 55 are formed at predetermined positions in the steel plate by punching. Furthermore, slit-shaped openings are formed by punching in the portion that will become the heat shield main body 51, and the portion adjacent to the opening is bent toward the surface by bending to form the air exhaust holes 53 and louvers 54. Furthermore, the outer edge of the heat shield main body 51 is bent toward the surface to form the air guide section 52.

[0047] According to the above embodiment, for example, the following advantageous effects are achieved.

[0048] According to the above embodiment, the cooling air that has passed through the air guide passage 426 provided in the motor support portion 42 is guided to the driver case 26 through the air guide portion 52. This allows the motor 2 (more specifically, the driver circuit 25) to be appropriately cooled. As a result, deterioration of the motor 2 over time can be delayed, which extends the life of the fan device 1 and contributes to reducing waste and defective products.

[0049] Additionally, an air guide passage 426 is provided in the existing motor support portion 42, and the air guide portion 52 is positioned so that it does not protrude radially outward from the motor support portion 42. This minimizes the amount of cooling air blocked by the air guide portion 52. As a result, the cooling air necessary to cool the radiator can be secured without increasing the size of the fan device 1.

[0050] Furthermore, according to the above embodiment, by inclining air guide passage 426 (more specifically, the inner peripheral surface of outer peripheral wall 422) radially inward, the cooling air that has passed through air guide passage 426 can be efficiently guided toward motor 2. Furthermore, according to the above embodiment, by gradually reducing the opening area of ​​air guide passage 426 toward the outlet, the cooling air passing through air guide passage 426 can be accelerated. As a result, motor 2 can be efficiently cooled.

[0051] Furthermore, according to the above embodiment, by covering the driver circuit 25 (more specifically, the driver case 26) with the heat shield 5, it is possible to prevent the temperature of the motor 2 (more specifically, the driver circuit 25) from rising due to radiant heat from the engine. This allows the driver circuit 25 to be efficiently cooled with a small amount of cooling air. As a result, it is possible to further prevent the fan device 1 from becoming larger.

[0052] Furthermore, according to the above embodiment, by discharging the cooling air through the exhaust holes 53 provided in the heat shield body 51, it is possible to prevent the cooling air from stagnating between the driver case 26 and the heat shield fixing part 425. This allows the cooling air to flow smoothly between the driver case 26 and the heat shield fixing part 425 through the air guide path 426 and the air guide part 52. As a result, the driver circuit 25 can be cooled efficiently with even less cooling air.

[0053] Also, according to the above embodiment, the exhaust direction of the cooling air can be controlled by providing louvers 54 adjacent to the exhaust holes 53. Furthermore, by making the opening area A1 of the exhaust holes 53 as viewed in the thickness direction of the heat shield 5 smaller than the opening area A2 of the exhaust holes 53 as viewed obliquely along the inclination direction of the louvers 54, it is possible to reduce the amount of infrared rays that reach the motor 2 from the engine through the exhaust holes 53 without reducing the amount of cooling air discharged.

[0054] Furthermore, in the above embodiment, an example has been described in which the fan device 1 is mounted on a vehicle driven by an engine, but the vehicle on which the fan device 1 is mounted may also be driven by an electric motor. In this case, since radiant heat is not generated from the engine, the heat shield body 51 can be omitted (i.e., the air guide section 52 may exist alone). Furthermore, in the above embodiment, an example has been described in which a radiator is the object to be cooled by the fan device 1, but the object to be cooled by the fan device 1 is not limited to this.

[0055] The above describes an embodiment of the present invention. However, the present invention is not limited to the above embodiment and includes various modifications. For example, the above embodiment has been described in detail to clearly explain the present invention, and is not necessarily limited to an embodiment including all of the described configurations. Furthermore, it is possible to replace part of the configuration of this embodiment with the configuration of another embodiment, and it is also possible to add the configuration of another embodiment to the configuration of this embodiment. Furthermore, it is possible to add, delete, or replace part of the configuration of this embodiment with other configurations. [Explanation of symbols]

[0056] 1: Fan device 2: Motor 3: Fan 4: Shroud 5: Heat shield 21: Motor bracket 22: Shaft 22A, 22B: Bearings 23: Rotor 24: Stator 25: Driver circuit 26: Driver case 27: Connector unit 28: Containment space 31: Boss 32: Blade 33: Connecting member 41: Shroud body 42: Motor support 43: Stay 51: Heat shield body 52: Air guide section 53:Exhaust hole 54: Louver 55: Bolt hole 231: Permanent magnet 232: Rotor yoke 232A,422 :Outer wall 232B,421:Inner peripheral wall 232C: Connecting wall 241: Stator core 242: Teeth 243: Coil 311: Disc section 312: Peripheral wall part 411: Fixed part 412: Fan housing hole 413: Reinforcement rib 422A: 1st page 422B: 2nd side 422C: Step 423: Connecting wall 424: Motor fixing part 425: Heat shield fixing part 426: Air guide path

Claims

1. a motor including a motor bracket, a rotor rotatably supported on a front surface of the motor bracket, a stator fixed to the front surface of the motor bracket and wound with a coil that generates a magnetic field for rotating the rotor, and a driver circuit fixed to a rear surface of the motor bracket and controlling the generation of the magnetic field by the coil; a fan including a boss fixed to the rotor and blades each protruding radially outward from an outer circumferential surface of the boss at circumferentially spaced positions; a shroud including a shroud body having a fan accommodating hole formed therein for accommodating the fan; a motor support portion that supports the motor at a center of the fan accommodating hole; and a plurality of stays that extend radially from the motor support portion toward the shroud body, the fan is disposed on a front surface side of the motor support portion, the motor is supported on a rear side of the motor support portion, a plurality of air guide passages each penetrating in a thickness direction are formed in the motor support portion at positions radially outwardly of the boss and spaced apart in a circumferential direction, A fan device further comprising an air guide section arranged on the rear side of the motor support section facing the air guide duct, and which guides the cooling air generated by the fan and which has passed through the air guide duct to the rear side of the motor bracket.

2. The fan device according to claim 1, The fan device is characterized in that the air guide passage is inclined radially inward of the motor support portion from the front surface side to the rear surface side of the motor support portion.

3. 3. The fan device according to claim 2, a fan device, wherein an opening area of ​​the air guide duct on the rear side of the motor support part is smaller than an opening area of ​​the air guide duct on the front side of the motor support part;

4. The fan device according to claim 1, a heat shield plate covering the driver circuit on the rear side of the motor; The fan device is characterized in that the airflow guidance section is provided on the outer edge of the heat shield plate.

5. The fan device according to claim 4, The fan device is characterized in that the heat shield plate has an exhaust hole formed therein that penetrates the heat shield plate in the thickness direction and exhausts the cooling air that has been guided between the driver circuit and the heat shield plate by the air guide section.

6. The fan device according to claim 5, The heat shield includes louvers inclined with respect to a thickness direction of the heat shield to control the flow of cooling air discharged from the exhaust holes, A fan device, characterized in that the opening area of ​​the exhaust holes as viewed in the thickness direction of the heat shield plate is smaller than the opening area of ​​the exhaust holes as viewed obliquely along the inclination direction of the louvers.

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