Fan device for radiator

Abstract

To provide a fan device for a radiator that can reduce weight.SOLUTION: A fan device 1 for a radiator includes: a fan 10 including a hub 11 to which a plurality of blades 12 are installed; a motor 20 for rotatably driving the fan 10; and a shroud 30 for covering the fan 10 and the motor 20. In the shroud 30 of the fan device 1 for a radiator, a shroud 31 for covering the fan 10 and the motor 20 and a motor fixing part 32 for fixing the motor 20 are configured integrally.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a fan device for a radiator.

Background Art

[0002] Generally, in a cooling fan device for a radiator (hereinafter referred to as "fan device for radiator") used for cooling a water-cooled engine, a shroud that covers a fan and a motor that rotationally drives the fan is provided (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a conventional fan device for a radiator, the motor was attached to the shroud via a plate fixed to the stator. That is, the conventional fan device for a radiator has a problem that the weight of the fan device for a radiator increases by the weight of the plate.

[0005] The present invention takes the above problems as an example, and an object thereof is to provide a fan device for a radiator capable of achieving weight reduction.

Means for Solving the Problems

[0006] In order to achieve the above object, a fan device for a radiator according to the present invention includes a fan provided with a plurality of blades on a hub, a motor that rotationally drives the fan, and a shroud that covers the fan and the motor, wherein the shroud is integrally formed of a shroud body that covers the fan and the motor and a motor fixing portion that fixes the motor.

[0007] In a fan device for a radiator according to one aspect of the present invention, the motor includes a stator having a stator core in which a cylindrical bearing holding hole is formed, a rotating shaft disposed in the bearing holding hole to which the fan is attached, and a pair of bearings disposed side by side in the axial direction in the bearing holding hole for rotatably supporting the rotating shaft with respect to the stator core. The stator has an engaging portion with the motor fixing portion, and the motor fixing portion has an engaged portion with the engaging portion.

[0008] In a fan device for a radiator according to one aspect of the present invention, the engaging portion and the engaged portion have a shape that fits with each other.

Effects of the Invention

[0009] According to the fan device for a radiator according to the present invention, weight reduction can be achieved.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0011] Hereinafter, a fan device for a radiator according to an embodiment of the present invention will be described with reference to the drawings.

[0012] FIG. 1 is a front view schematically showing the configuration of the radiator fan device 1 according to an embodiment of the present invention. FIG. 2 is a side view schematically showing the configuration of the radiator fan device 1. FIG. 3 is an enlarged cross-sectional view of the radiator fan device 1.

[0013] In the following description, for convenience, in the direction of the axis x shown in FIG. 3 (hereinafter referred to as the “axial direction”), the arrow a direction is defined as the upper side a, and the arrow b direction is defined as the lower side b. Further, in the radial direction perpendicular to the axis x, the direction away from the axis x (arrow c direction in FIG. 3) is defined as the outer peripheral side c, and the direction toward the axis x (arrow d direction in FIG. 3) is defined as the inner peripheral side d. In the following description, for convenience, the direction shown in FIG. 3 is taken as the side surface of the motor 20.

[0014] [Overview of the Embodiment] As shown in FIGS. 1 to 3, the radiator fan device 1 according to the present embodiment includes a fan 10 in which a plurality of blades 12 are provided on a hub 11, a motor 20 that rotationally drives the fan 10, and a shroud 30 that covers the fan 10 and the motor 20. In the radiator fan device 1, the shroud 30 is integrally formed by a shroud main body 31 that covers the fan 10 and the motor 20, and a motor fixing portion 32 that fixes the motor 20.

[0015] In the radiator fan device 1, for example, the motor 20 includes a stator 21 having a stator core 222 in which a cylindrical bearing holding hole 211 is formed, a rotating shaft 22 that is disposed in the bearing holding hole 211 and to which the fan 10 is attached, and a pair of bearings 23 that are arranged side by side in the axial direction in the bearing holding hole 211 and rotatably support the rotating shaft 22 with respect to the stator core 222. The stator 21 has an engaging portion 223 with the motor fixing portion 32, and the motor fixing portion 32 has an engaged portion 321 with the engaging portion 223.

[0016] In the stator 21 of the motor 20, for example, the engaging portion 223 and the engaged portion 321 have a shape that fits with each other.

[0017] [Configuration of Radiator Fan Device] As shown in FIGS. 1 and 2, the radiator fan device 1 is provided on a vehicle to introduce outside air into a radiator (not shown) that cools the coolant of a water-cooled engine of a vehicle (not shown) such as an automobile or a motorcycle. The radiator fan device 1 is generally provided on the rear side (rearward in the vehicle traveling direction) or the front side (forward in the traveling direction) of the radiator. When the coolant exceeds a predetermined temperature during parking or low-speed driving, etc., the motor 20 is rotationally driven, and the fan 10 sends outside air into the radiator to forcibly cool the coolant in the radiator.

[0018] As shown in FIG. 3, in addition to the stator 21, the rotating shaft 22, and the pair of bearings 23 which are the main components described above, the motor 20 includes a rotor 6. The motor 20 is an outer rotor type motor and is, for example, a brushless direct current (DC) motor.

[0019] The stator 21 includes, in addition to the stator core 222 and the engaging portion 223 described above, a coil 220 and an insulator 225.

[0020] The stator core 222 has an outer periphery formed in an annular or substantially annular shape, and a cylindrical bearing holding hole 211 is formed in the inner periphery. The stator core 222 is formed by laminating a plurality of thin plates of an annular magnetic material such as a steel plate. In FIG. 3, the illustration of the thin plates constituting the stator core 222 is omitted.

[0021] The coil 220 is wound around the stator core 222 via the insulator 225. The insulator 225 is an insulating member attached to the stator core 222.

[0022] A pair of bearings 23 are arranged side by side in the axial direction within the bearing holding holes 211. The pair of bearings 23 rotatably support the rotating shaft 22 with respect to the stator core 222. The pair of bearings 23 are press-fitted into the inner peripheral surface of the bearing holding holes 211 of the stator core 222. The pair of bearings 23 are arranged spaced apart in the axial direction of the rotating shaft 22 within the bearing holding holes 211.

[0023] One of the pair of bearings 23 is provided on the upper side in the axial direction of the rotating shaft 22. The other of the pair of bearings 23 is provided on the lower side in the axial direction of the rotating shaft 22. The pair of bearings 23 are ball bearings including rolling elements provided between the inner ring and the outer ring in addition to the inner ring and the outer ring.

[0024] The engaging portion 223 is a portion on the lower side in the axial direction of the bearing holding hole 211 (the side opposite to the side where the rotor 6 is provided) in the stator core 222. That is, the engaging portion 223 uses a part of the bearing holding hole 211 for fixing the motor 20 and the shroud 30.

[0025] The engaging portion 223 is a part where the motor fixing portion 32 and the stator core 222 are engaged. The engaging portion 223 has a shape that can be engaged with the engaged portion 321 provided on the motor fixing portion 32. The engaging portion 223 is, for example, specifically, a cylindrical or substantially cylindrical hole formed in a concave shape from the bottom surface portion 224 on the lower side in the axial direction of the stator core 222 toward the upper side in the axial direction.

[0026] As shown in FIGS. 1 to 3, in the radiator fan device 1, the shroud 30 covers the space between the outer peripheral side of the fan 10 and the front surface or the rear surface of a radiator (not shown). The shroud 30 is integrally formed by a resin material or the like with the shroud main body 31 and the motor fixing portion 32.

[0027] The shroud main body 31 forms the general shape of the shroud 30 that covers the space between the outer peripheral side of the fan 10 and the radiator. The motor fixing portion 32 is provided for fixing the motor 20 to the shroud 30.

[0028] FIG. 4 is a front view of the engaged portion 321 of the motor fixing portion 32 of the shroud 30 of the radiator fan device 1. In FIG. 4, in order to describe the shapes of the motor fixing portion 32 and the engaged portion 321, illustration of components provided around the motor fixing portion 32 in the radiator fan device 1 is omitted. FIG. 5 is a front view of the insertion hole 325 of the shroud 30 of the radiator fan device 1. FIG. 6 is a cross-sectional view of the insertion hole 325.

[0029] As shown in FIGS. 3 to 5, the motor fixing portion 32 has a base plate 320, an engaged portion 321, a positioning portion 322, and an insertion hole 325.

[0030] As shown in FIG. 3, the base plate 320 is a part for fixing the motor 20 to the shroud 30. The base plate 320 is formed in, for example, a flat plate shape corresponding to the shape of the bottom surface portion 224 of the stator core 222 of the motor 20 in order to reliably contact the bottom surface portion 224.

[0031] As shown in FIG. 4, on the base plate 320, for example, a convex engaged portion 321 is provided at or near the center of the plane. The engaged portion 321 is a part that engages the motor fixing portion 32 and the stator core 222 by engaging with the engaging portion 223. The engaged portion 321 has a shape that can engage with the engaging portion 223 provided on the stator core 222. Specifically, for example, in a situation where the motor fixing portion 32 and the stator core 222 are engaged, the engaged portion 321 is a cylindrical or substantially cylindrical convex portion formed in a convex shape upward in the axial direction from the base plate 320 facing the bottom surface portion 224 of the stator core 222.

[0032] As shown in FIG. 4, the positioning portion 322 is a convex portion facing the outer peripheral side, which is provided on the cylindrical or substantially cylindrical outer peripheral surface 324 of the engaged portion 321. A plurality of positioning portions 322 are provided on the cylindrical or substantially cylindrical outer peripheral surface 324 of the engaged portion 321 in the circumferential direction of the positioning portion 322. In the motor fixing portion 32, the number of the positioning portions 322, the arrangement interval of the plurality of positioning portions 322, or the shape of the positioning portion 322 can be set as appropriate. The engaged portion 321 is fitted with the engaging portion 223 by the positioning portion 322 coming into contact with the inner peripheral surface of the engaging portion 223.

[0033] As shown in FIGS. 5 and 6, the shroud 30 is provided with an insertion hole 325 for passing through the energizing components 27 such as magnet wires, terminals, and bus bars from the motor 20. In the insertion hole 325, a tapered shape 326 for guiding can be provided on the upper side in the axial direction through which the energizing component 27 is inserted in order to facilitate the positioning of the energizing component 27. When the energizing component 27 is a component having rigidity, the energizing component 27 and the insertion hole 325 can be used as an energizing component positioning portion for positioning the motor 20 with respect to the shroud 30. Further, a protruding portion 327, which is a convex portion facing the outer peripheral side, can also be provided in the insertion hole 325.

[0034] Note that electronic components constituting a control circuit for controlling the operation of the motor 20 may be mounted on the shroud 30.

[0035] The rotor 6 is fixed to the rotating shaft 22 and supports the permanent magnet 61 on the outer periphery of the stator 21. The rotor 6 includes an annular or substantially annular cylindrical portion 62 that covers the outer peripheral side of the stator 21 and supports the permanent magnet 61 on the inner periphery, and a disc-shaped or substantially disc-shaped top surface portion 63 that covers the upper side of the stator 21. The rotor 6 is fixed to the rotating shaft 22. Specifically, one end portion 226 at the upper end in the axial direction of the rotating shaft 22 is located on the side of the top surface portion 63 of the rotor 6. The hub 11 is fixed to the top surface portion 63 of the rotor 6.

[0036] Next, the operation of the radiator fan device 1 having the configuration described above will be described.

[0037] According to the radiator fan device 1 described above, by providing the shroud 30 made of a resin material with a motor fixing portion 32 for fixing the stator core 222 of the motor 20, there is no need to provide parts such as a plate for fixing the motor 20 to the motor 20 and the shroud 30, so that the weight and cost of the abolished parts can be reduced.

[0038] According to the radiator fan device 1 described above, the bearing holding hole 211 for holding the pair of bearings 23 in the stator core 222 can be used as the engaging portion 223. Further, according to the radiator fan device 1, the positioning between the shroud 30 and the motor 20 can be performed by the inro-shaped positioning portion 322 provided on the engaged portion 321 on the shroud 30 side.

[0039] According to the radiator fan device 1 described above, the energizing component 27 can be accurately assembled while positioning the energizing component 27 on the shroud 30 by the positioning portion 322 provided on the engaged portion 321 and the energizing component positioning portion constituted by the energizing component 27, the insertion hole 325. Further, since the rotating shaft 22 is fixed to the rotor 6 side, a high-strength metal plate required when the rotating shaft 22 is fixed to the stator 21 side can be omitted. When the rotating shaft 22 is directly fixed to the resin-made shroud without using the above plate, the assembly accuracy is insufficient or the rotation accuracy of the rotating shaft 22 deteriorates.

[0040] Therefore, according to the radiator fan device 1 described above, weight reduction can be achieved.

[0041] In addition, those skilled in the art can appropriately modify the present invention according to conventionally known knowledge. As long as the configuration of the present invention is still provided by such modification, of course, it is included in the scope of the present invention.

[0042] In the radiator fan device 1 described above, the shapes of the engaging portion 223 and the engaged portion 321 are not limited to the shapes described above. That is, in the radiator fan device, the shapes of the engaging portion and the engaged portion are not limited to a cylindrical or substantially cylindrical shape as long as the stator core of the motor and the motor fixing portion of the shroud can be fixed. For example, various shapes such as a rectangular or substantially rectangular shape can be adopted.

[0043] In the radiator fan device 1, the engaging portion 223 is not limited to using a part of the bearing holding hole 211 described above. For example, it can also be provided independently of the bearing holding hole 211.

[0044] In the radiator fan device 1, as long as the engaging portion and the engaged portion can fix the stator core of the motor and the motor fixing portion of the shroud, they are not limited to the concave engaging portion 223 and the convex engaged portion 321 as described above, and the concave-convex relationship may be different.

[0045] In the radiator fan device 1, the shape of the positioning portion 322 is not limited, and the positioning portion 322 may not be provided on the engaged portion 321.

[0046] Although the motor 20 described above has been described by taking the example of a brushless direct current (DC) motor, the present invention is not limited thereto. Further, although an example in which the motor fixing portion 32 for fixing the motor 20 is provided on the shroud 30 has been given, it has a general-purpose structure that can be used for general outer rotor type motors.

Description of Reference Numerals

[0047] 1…Radiator fan device, 6…Rotor, 10…Fan, 11…Hub, 12…Blade, 20…Motor, 21…Stator, 22…Rotating shaft, 23…Bearing, 27…Electrical component, 30…Shroud, 31…Shroud body, 32…Motor fixing part, 61…Permanent magnet, 62…Cylindrical part, 63…Top surface, 220…Coil, 221…Bearing holding hole, 222…Stator core, 223…Engaging part, 224…Bottom surface, 225…Insulator, 226…One end part, 320…Base plate, 321…Engaged part, 322…Positioning part, 324…Outer peripheral surface, 325…Insertion hole, 326…Taper shape, 327…Protrusion

Claims

1. A radiator fan device comprising a fan having a plurality of blades provided on a hub, a motor for rotationally driving the fan, and a shroud covering the fan and the motor, wherein the shroud, is integrally formed by a shroud body covering the fan and the motor, and a motor fixing portion for fixing the motor. A radiator fan device.

2. The motor, has a stator having a stator core in which a cylindrical bearing holding hole is formed, a rotating shaft disposed in the bearing holding hole to which the fan is attached, and a pair of bearings arranged side by side in the axial direction in the bearing holding hole for rotatably supporting the rotating shaft with respect to the stator core, the stator has an engaging portion with the motor fixing portion, and the motor fixing portion has an engaged portion with the engaging portion. The radiator fan device according to Claim 1.

3. The engaging portion and the engaged portion have shapes that fit with each other. The radiator fan device according to Claim 2.

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