WO2019130927A1

WO2019130927A1 - Fan drive device

Info

Publication number: WO2019130927A1
Application number: PCT/JP2018/043169
Authority: WO
Inventors: 竹内　徳久
Original assignee: 株式会社デンソー
Priority date: 2017-12-25
Filing date: 2018-11-22
Publication date: 2019-07-04
Also published as: JP2019115208A

Abstract

This fan drive device is provided with: a motor shaft (12) having one end affixed to a center piece (18); a rotor (14) having a rotor housing (26) rotating about the axis of the motor shaft; and a fan (50) affixed to the rotor housing and rotating with the rotor housing. The fan has a guide section (511, 512, 5121, 513) which, when fitted to the motor shaft, guides the motor shaft so that the axis of the motor shaft and the center of rotation of the fan coincide.

Description

Fan drive

Cross-reference to related applications

This application is based on Japanese Patent Application No. 2017-248105 filed on Dec. 25, 2017, the contents of which are incorporated herein by reference.

The present disclosure relates to a fan drive.

As an electric motor used for this type of device, there is one described in Patent Document 1. The motor includes a motor shaft fixed to a center piece, a rotor rotating around the shaft axis, and a bottomed cylindrical rotor housing which is integrally rotated with the rotor and disposed so as to cover the rotor. Is equipped. In this electric motor, a rotor covered with a bottomed cylindrical rotor housing rotates around the axial center of a shaft fixed to the center piece.

JP, 2016-167943, A

In view of the above-mentioned Patent Document 1, as for the inventor, as shown in FIG. 14, the structure in which the fan 90 is screwed to the rotor housing 95 by using a plurality of screw holes 951 provided in the rotor housing 95 of the motor 94. ,investigated.
Specifically, the rotor housing 95 has a plurality of screw holes 951 for fastening the screws 96 for fixing the fan 90, and a circle at a position radially outward from the rotation center of the rotor housing 95 by a predetermined length. A plurality of arc-shaped elongated holes 952 are formed.

On the other hand, a plurality of holes 901 through which screws 96 for fixing the fan 90 are inserted in the fan 90, and two each for each long hole 952 formed in the rotor housing 95 in each long hole 952 A plurality of pins (not shown) to be inserted are formed. These pins are erected on the surface of the fan 90 on the rotor housing 95 side.

When fixing the fan 90 to the rotor housing 95, first, the cylindrical portion 90a of the fan 90 is set so that the plurality of screw holes 951 of the rotor housing 95 and the plurality of holes 901 formed in the fan 90 coincide with each other. The housing 95 is arranged to be covered from the outside. At this time, a plurality of pins (not shown) erected on the surface of the fan 90 on the side of the rotor housing 95 are inserted into the long holes 952 formed in the rotor housing 95 to position the fan 90.

Then, while maintaining this positioned state, the screws 96 are inserted through the holes 901 of the fan 90 and the screws 96 are fastened to the screw holes 951 formed in the rotor housing 95 to fix the fan 90 to the rotor housing 95 Do.

However, the electric motor described above has a plurality of pins erected on the shaft center of the motor shaft, that is, the dimensional dispersion between the rotation center of the rotor housing 95 and the long hole 952 and the fan 90 on the rotor housing 95 side. Greatly affected by the dimensional variation of the In this manner, the fan 90 is fixed to the rotor housing 95 in such a method that the fan 90 is positioned using the plurality of elongated holes 952 formed at positions separated radially outward from the rotation center of the rotor housing 95 by a predetermined length. In this case, a deviation is likely to occur between the axial center of the motor shaft and the rotational center of the fan 90.

As described above, if there is a deviation between the shaft center of the motor shaft and the rotational center of the fan, the rotational balance after the fan is assembled to the motor is deteriorated.

The present disclosure aims to improve the positioning accuracy of the fan when fixing the fan to the rotor housing.

According to one aspect of the present disclosure, a fan drive device includes a motor shaft having one end fixed to a center piece, a rotor having a rotor housing rotating about the axis of the motor shaft, and a rotor housing fixed to the rotor housing. A fan integrally rotating with the housing, wherein the fan has a guide portion for guiding the motor shaft so that the axis of the motor shaft and the rotation center of the fan coincide with each other by fitting with the motor shaft There is.

According to such a configuration, the guide unit guides the motor shaft such that the axis of the motor shaft and the rotational center of the fan coincide with each other by fitting with the motor shaft, and therefore, the fan is fixed to the rotor housing. The positioning accuracy of the fan can be improved.

In addition, the parenthesized reference symbol attached to each component etc. shows an example of the correspondence of the component etc. and the specific component etc. as described in the embodiment to be described later.

It is a longitudinal cross-sectional view of the fan drive device which concerns on 1st Embodiment. It is an II arrow line view in FIG. FIG. 3 is an enlarged sectional view taken along the line III-III in FIG. It is an IV arrow line view in FIG. It is an III-III enlarged sectional view corresponding to a fan drive concerning a 2nd embodiment. It is VI arrow line view which looked at center parts in FIG. It is an III-III enlarged sectional view corresponding to the fan drive device concerning a 3rd embodiment. It is a figure for demonstrating assembly | attachment of the fan of the fan drive device which concerns on 3rd Embodiment. It is an III-III enlarged sectional view corresponding to the center part of the fan drive device concerning a 4th embodiment. It is an III-III enlarged sectional view corresponding to the center part of the fan drive device concerning a 5th embodiment. It is IV arrow line view corresponding to the center part of the fan drive device which concerns on 6th Embodiment. It is IV arrow line view corresponding to the center part of the fan drive device which concerns on 7th Embodiment. It is an III-III enlarged sectional view corresponding to the center part of the fan drive device concerning an 8th embodiment. It is a figure showing assembly of the fan to the conventional motor.

Hereinafter, embodiments of the present disclosure will be described based on the drawings. In the following embodiments, parts identical or equivalent to each other are denoted by the same reference numerals in the drawings.

First Embodiment
The fan drive apparatus according to the first embodiment will be described with reference to FIGS. 1 to 4. As shown in FIG. 1, the fan drive device includes an outer rotor type brushless motor 10 and a fan 50 rotationally driven by the brushless motor 10. The brushless motor 10 is suitably used, for example, as a fan motor for a vehicle, and is fixed to the vehicle body such that the motor shaft 12 is disposed along the horizontal direction.

The brushless motor 10 includes a motor shaft 12, a rotor 14, a stator 16, a center piece 18, a circuit board 20, a connector member 22, and a board case 24.

The rotor 14 includes a rotor housing 26 and a rotor magnet 28. The rotor housing 26 has a cylindrical bearing accommodating portion 30 provided radially outward of the motor shaft 12 and a bottomed cylindrical outer cylindrical portion 32 formed radially outward of the bearing accommodating portion 30. ing. A rotor magnet 28 is provided on the inner circumferential surface of the outer cylindrical portion 32.

One axial direction side of the outer cylinder portion 32 is opened, and a bottom wall portion 34 is formed on the other axial direction side of the outer cylinder portion 32. The above-mentioned bearing accommodating portion 30 extends from the central portion of the bottom wall portion 34 to the center piece 18 side.

The bearing accommodating portion 30 accommodates a pair of bearings 38, and the motor shaft 12 is assembled to the pair of bearings 38. Both axial sides of the bearing accommodating portion 30 are open, and one end of the motor shaft 12 protrudes from the bearing accommodating portion 30 toward the center piece 18 through an opening on one axial side of the bearing accommodating portion 30.

The stator 16 includes a stator core 40 and a plurality of windings 46. The stator core 40 is accommodated inside the outer cylindrical portion 32 and disposed between the bearing accommodation portion 30 and the rotor magnet 28 in the radial direction.

The center piece 18 is made of, for example, aluminum. The center piece 18 has a flat body portion 62. The main body 62 is disposed on the surface of the center piece 18 opposite to the stator core 40. A recess 60 for inserting one end of the motor shaft 12 is formed on the surface of the main body 62 on the stator core 40 side.

The circuit board 20 is fixed to the surface of the main body 62 opposite to the stator core 40. The circuit board 20 is formed with an electronic circuit for switching the energization of the plurality of windings 46 described above. The connector member 22 is provided on one side of the main body 62. A connector portion 70 is provided in the connector member 22, and a connector terminal provided in the connector portion 70 is electrically connected to an electronic circuit formed on the circuit board 20.

The substrate case 24 is formed in a flat box shape, and is assembled to the main body 62 from the side opposite to the stator core 40 with respect to the main body 62. A housing space 72 is formed between the substrate case 24 and the main body 62, and the circuit board 20 is housed in the housing space 72.

The fan 50 is disposed so as to surround the center part 51 provided at the central part of the fan 50, the insert portion 52 disposed so as to extend around the center part 51, and the periphery of the insert portion 52. A fan boss 53 and a plurality of blades 54 are provided.

The center part 51, the fan bosses 53, and the plurality of blades 54 are made of resin, and the insert portion 52 is made of metal such as aluminum. In the present embodiment, the center part 51, the insert portion 52, the fan boss 53, and the plurality of blades 54 are integrated by integral molding.

The center part 51 has a disk shape. On a surface of the center part 51 on the motor shaft 12 side, a convex portion 511 having a conical shape, an assembly guide 512 having a cylindrical shape, and a plurality of guide ribs 5121 are formed. The center part 51, the convex portion 511, the assembly guide 512 and the plurality of guide ribs 5121 are integrally formed by integral molding.

One end of the motor shaft 12 is fitted into and fixed to a recess 60 formed in the main body 62. At the center of the end of the motor shaft 12 on the other end side, an end recess 121 that is recessed to the one end side of the motor shaft 12 is formed. The cross section of the distal end recess 121 is V-shaped. The center of the tip end recess 121 coincides with the axial center of the motor shaft 12.

The axial center of the convex portion 511 and the axial center of the assembly guide 512 are formed to coincide with the rotational center of the fan 50, respectively.

The assembly guide 512 has a cylindrical shape, and is formed so as to project from the rotation center of the fan 50 to the motor shaft 12 side.

A plurality of guide ribs 5121 are formed on the inner peripheral surface of the assembly guide 512 so as to project in the axial center direction of the assembly guide 512 from the inner peripheral surface of the assembly guide 512. Specifically, three guide ribs 5121 are formed on the inner circumferential surface of the assembly guide 512. Each guide rib 5121 protrudes from three directions on the inner peripheral surface of the assembly guide 512 toward the axial center of the assembly guide 512.

Each guide rib 5121 has a corner formed at its tip. Specifically, the cross-sectional shape of the guide rib 5121 orthogonal to the axial direction of the assembly guide 512 is fan-shaped. When the tip of each guide rib 5121 contacts the outer peripheral surface of the motor shaft 12, the motor shaft 12 is guided such that the axial center of the motor shaft 12 and the rotation center of the fan 50 coincide with each other.

In the present embodiment, the convex portion 511 corresponds to a guide portion, and the assembly guide 512 and the plurality of guide ribs 5121 also correspond to a guide portion.

The insert portion 52 is formed with a plurality of holes 521 for inserting the plurality of screws 81. As shown in FIG. 1, the fan 50 is screwed to the rotor housing 26 by a plurality of screws 81. The screws 81 are inserted into the holes 521 formed in the insert portion 52 of the fan 50 and fastened to the screw holes 261 formed in the rotor housing 26.

The fan boss 53 has a bottomed cylindrical shape. At the bottom of the fan boss 53, an insert 52 and a center part 51 are disposed. A plurality of blades 54 are radially formed on the outer peripheral surface of the fan boss 53.

Next, assembly of the fan 50 to the rotor housing 26 will be described.

First, the operator prepares the rotor housing 26 and the fan 50, and then inserts the other end of the motor shaft 12 inside the assembly guide 512 formed on the center part 51 of the fan 50. At this time, the motor shaft 12 is guided by the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 such that the axial center of the motor shaft 12 coincides with the axial center of the assembly guide 512.

Next, the rotor housing 26 side of the fan 50 and the rotor housing 26 are arranged so that the positions of the holes 521 formed in the insert portion 52 of the fan 50 and the screw holes 261 formed in the rotor housing 26 coincide with each other. Attach the face of the fan 50 side.

At this time, the tip of the convex portion 511 formed on the center part 51 of the fan 50 is fitted in the tip recess 121 formed in the center of the tip on the other end side of the motor shaft 12 so that the shaft center of the motor shaft 12 is The motor shaft 12 is guided to coincide with the axial center of the assembly guide 512.

Next, after inserting a screw 81 into one hole 521 formed in the insert portion 52 of the fan 50, the screw 81 is rotated using a tool, and each fan formed in the rotor housing 26 Screws are fixed to the holes 261. Similarly, the fan 50 is screwed to the rotor housing 26 using the screws 81 for the remaining holes 521. Thus, the fan 50 is assembled to the rotor housing 26 so that the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other.

Next, the operation of the fan drive device will be described.

In this fan drive device, when energization to the plurality of windings 46 is switched by the electronic circuit formed on the circuit board 20, a rotating magnetic field is formed on the stator 16, and the function between the rotating magnetic field and the rotor magnet 28 The suction and the repulsive force rotate the fan 50 together with the rotor 14.

Immediately after the assembly of the fan 50 to the rotor housing 26 in the fan drive device is completed, the tips of the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 are in contact with the motor shaft 12. Furthermore, the end of the convex portion 511 formed on the center part 51 of the fan 50 is also in contact with the end recess 121 formed in the center of the end on the other end side of the motor shaft 12.

However, while the rotor 14 rotates, the tips of the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 wear due to the friction with the motor shaft 12. Further, the tip of the convex portion 511 formed on the center part 51 of the fan 50 is also worn away by the friction with the motor shaft 12.

In particular, in the fan drive device of the present embodiment, the tips of the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 and the tips of the convex portions 511 formed on the center part 51 of the fan 50 are worn easily. It has become.

Specifically, corner portions are formed at the tips of the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512. Further, the tip of the convex portion 511 formed on the center part 51 of the fan 50 has a conical shape. Further, each of the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 and the convex portion 511 formed on the center part 51 of the fan 50 are made of resin.

Therefore, while the rotor 14 rotates, the tip of each guide rib 5121 and the tip of the convex portion 511 formed on the center part 51 wear quickly. Therefore, the friction between the tip of each guide rib 5121 and the motor shaft 12 and the friction between the tip of the convex portion 511 and the motor shaft 12 are reduced, and the situation where the motor is locked or the rotational speed of the rotor 14 is reduced. It is possible to avoid such situations.

In addition, corner portions are formed at the tips of the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512. Therefore, the contact area between the end of each guide rib 5121 and the motor shaft 12 can be reduced, and the friction between the end of each guide rib 5121 and the motor shaft 12 can be further reduced.

Further, the tip of the convex portion 511 formed on the center part 51 of the fan 50 has a conical shape. Therefore, the contact area between the tip of the convex portion 511 and the motor shaft 12 can be reduced, and the friction between the tip of the convex portion 511 and the motor shaft 12 can be further reduced.

As described above, the fan drive device includes the motor shaft 12 whose one end is fixed to the center piece 18 and the rotor 14 having the rotor housing 26 that rotates about the axial center of the motor shaft 12. There is. Furthermore, a fan 50 fixed to the rotor housing 26 and rotating integrally with the rotor housing 26 is provided. The fan 50 has

guides

511, 512, 5121 for guiding the motor shaft 12 so that the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other by fitting with the motor shaft 12. There is.

According to such a configuration, the

guide portions

511, 512, 5121 guide the motor shaft 12 so that the axial center of the motor shaft 12 and the rotation center of the fan 50 coincide with each other by fitting with the motor shaft 12. The positioning accuracy of the fan when fixing the fan 50 to the rotor housing 26 can be improved.

Thereby, the balance adjustment after the assembly of the fan 50 to the rotor housing 26 can be eliminated.

The guide portion has a convex portion 511 that protrudes toward the motor shaft 12 from the rotation center of the fan 50, and the distal end surface of the other end of the motor shaft 12 has a distal end recess 121 that is recessed to one end of the motor shaft 12. It is formed. Then, the convex portion 511 is fitted in the distal end concave portion 121, and the rotation center of the fan 50 and the axial center of the motor shaft 12 are aligned.

Thus, the center of rotation of the fan 50 is engaged by fitting the convex portion 511 which protrudes toward the motor shaft 12 from the center of rotation of the fan 50 in the end recessed portion 121 formed in the end surface on the other end side of the motor shaft 12 And the axis of the motor shaft 12 coincide with each other.

Furthermore, the guide portion is a cylindrical portion 512 which protrudes toward the motor shaft 12 from the rotation center of the fan 50, and the inside of the cylinder portion 512 such that the axis of the motor shaft 12 coincides with the rotation center of the fan 50. And a plurality of guide ribs 5121 protruding in the axial center direction of the cylindrical portion 512 from the circumferential surface. Then, the motor shaft 12 is fitted into the inside of the cylindrical portion 512, and the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other.

As described above, the motor shaft 12 may be fitted inside the cylindrical portion 512 so that the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other.

In addition, the convex portion 511 has a conical shape or a polygonal pyramid shape. Therefore, as the rotor 14 rotates, the convex portion 511 easily wears, and the friction between the convex portion 511 and the motor shaft 12 causes the motor to lock, and the rotational speed of the rotor 14 decreases. It can be avoided.

In addition, the plurality of guide ribs 5121 have corner portions formed at their tips. Therefore, it is possible to avoid the situation in which the tips of the plurality of guide ribs 5121 are easily worn and the motor is locked due to the friction between the plurality of guide ribs and the motor shaft and the situation in which the rotational speed of the rotor 14 is reduced. .

Further, the convex portion 511 corresponding to the guide portion and the plurality of guide ribs 5121 are made of resin. Therefore, the situation where the convex portion 511 and the plurality of guide ribs 5121 are worn quickly and the motor is locked due to the friction with the motor shaft 12 and the situation where the rotational speed of the rotor 14 is reduced can be avoided. .

Further, the fan 50 has a resin center part 51 in which a guide part is formed, and a metal insert part 52 disposed so as to spread around the center part 51. Then, the insert portion 52 is screwed to the rotor housing 26 using the screw 81, whereby the fan is assembled to the rotor housing.

Thus, since the fan 50 is assembled to the rotor housing 26 by screw-fixing the metal insert portion 52 to the rotor housing 26 using the screw 81, the strength of the fan 50 can be secured.

The fan 50 also has a blade 54 made of resin. Therefore, for example, the weight can be reduced as compared to the case where the blade 54 is made of metal.

Second Embodiment
The fan drive apparatus according to the second embodiment will be described with reference to FIGS. 5 to 6. In the fan drive device of the first embodiment, the center part 51 is formed with a convex portion 511, a cylindrical assembly guide 512, and a plurality of guide ribs 5121. On the other hand, in the fan drive device of the present embodiment, the convex portion 511 is not formed on the center part 51. Furthermore, the end recess 121 is not formed at the end on the other end side of the motor shaft 12.

In the fan drive device of the present embodiment, a guide portion is configured by a cylindrical assembly guide 512 formed on the center part 51 and a plurality of guide ribs 5121.

In this embodiment, when the operator assembles the fan 50 into the rotor housing 26, first, the rotor housing 26 and the fan 50 are prepared, and then, the inside of the assembly guide 512 formed on the center part 51 of the fan 50 is prepared. And the other end of the motor shaft 12 is inserted. At this time, the motor shaft 12 is guided by the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 such that the axial center of the motor shaft 12 coincides with the axial center of the assembly guide 512.

Next, the rotor housing 26 side of the fan 50 and the rotor housing 26 are arranged so that the positions of the holes 521 formed in the insert portion 52 of the fan 50 and the screw holes 261 formed in the rotor housing 26 coincide with each other. Attach the face of the fan 50 side. In this state, each screw 81 is rotated using a tool, and the fan 50 is screwed into each screw hole 261 formed in the rotor housing 26. Thus, the fan 50 is assembled to the rotor housing 26 so that the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other.

In the present embodiment, the same effects obtained from the configuration common to the first embodiment can be obtained in the same manner as the first embodiment.

As described above, in the guide portion, the cylindrical cylindrical portion 512 protruding toward the motor shaft 12 from the rotation center of the fan 50, and the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other. And a plurality of guide ribs 5121 which project from the inner peripheral surface of the cylindrical portion 512 in the axial center direction of the cylindrical portion 512. Then, the motor shaft 12 is fitted into the inside of the cylindrical portion 512, and the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other.

As described above, the motor shaft 12 can be fitted inside the cylindrical portion 512 so that the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other.

Third Embodiment
A fan drive apparatus according to a third embodiment will be described using FIGS. 7 to 8. FIG. The fan drive apparatus of this embodiment further includes a spring member 80 for urging the rotor housing 26 to the other end side of the motor shaft 12 in addition to the fan drive apparatus of the first embodiment, and a motor shaft The difference is that the length of 12 is shorter.

The spring member 80 is constituted by a spring coil. One end of the spring member 80 is fixed to the center piece 18, and the other end of the spring member 80 is disposed to abut on one of the bearings 38. The spring member 80 is in contact with one of the bearings 38 to bias the rotor housing 26 toward the other end of the motor shaft 12.

The center part 51 of the fan 50 is formed with a convex portion 511 that protrudes toward the motor shaft 12 from the rotation center of the fan 50. Further, on the tip end surface of the motor shaft 12 on the other end side, there is formed a tip recess 121 which is recessed on one end side of the motor shaft 12.

When the rotor housing 26 is pressed to one end of the motor shaft 12 against the biasing force of the spring member 80, the rotor housing 26 is displaced to one end of the motor shaft 12. At this time, the end of the convex portion 511 formed on the center part 51 of the fan 50 is fitted in the end recess 121 formed in the center of the end on the other end side of the motor shaft 12.

In addition, when the pressing force on the rotor housing 26 disappears, the rotor housing 26 is displaced to the other end side of the motor shaft 12 and returns to the original position.

In the present embodiment, when the operator assembles the fan 50 to the rotor housing 26, first, the rotor housing 26 and the fan 50 are prepared, and then the rotor housing 26 is the motor shaft against the biasing force of the spring member 80. Press to one end of 12. At this time, the motor shaft 12 is guided by the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 such that the axial center of the motor shaft 12 coincides with the axial center of the assembly guide 512. Furthermore, the shaft center of the motor shaft 12 can be obtained by fitting the end of the convex portion 511 formed on the center part 51 of the fan 50 into the end recess 121 formed in the center of the end on the other end side of the motor shaft 12. The motor shaft 12 is guided to coincide with the axial center of the assembly guide 512.

In this state, the positions of the holes 521 formed in the insert portion 52 of the fan 50 and the screw holes 261 formed in the rotor housing 26 are matched, and the screws 81 are rotated using a tool, and the fan 50 is rotated. Screws are fixed to respective screw holes 261 formed in the rotor housing 26. Thereafter, when the pressing force on the rotor housing 26 is eliminated, the rotor housing 26 is displaced to the other end side of the motor shaft 12 and returns to the original position. Thus, the fan 50 is assembled to the rotor housing 26 so that the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other.

In the fan drive device of the present embodiment, the tips of the guide ribs 5121 formed on the inner circumferential surface of the assembly guide 512 do not contact the motor shaft 12 after the fan 50 is assembled to the rotor housing 26. Furthermore, the tip of the convex portion 511 formed on the center part 51 of the fan 50 does not contact the tip recess 121 formed at the center of the tip on the other end side of the motor shaft 12.

As described above, the fan drive device of the present embodiment includes the spring member 80 that biases the rotor housing 26 to the other end side of the motor shaft 12, and the guide portion is the motor shaft 12 from the rotation center of the fan 50. A distal end concave portion 121 having a convex portion 511 projecting to the side and having a concave end on one end side of the motor shaft 12 is formed on the distal end surface on the other end side of the motor shaft 12. Then, when the rotor housing 26 is pressed to one end side of the motor shaft 12, the convex portion 511 is fitted in the distal end concave portion 121, and the rotation center of the fan 50 and the axial center of the motor shaft 12 coincide with each other. .

As described above, when the rotor housing 26 is pressed to one end side of the motor shaft 12, the convex portion 511 is fitted in the distal end concave portion 121 so that the rotation center of the fan 50 and the axis of the motor shaft 12 coincide. Can be configured to be

Further, after the fan 50 is assembled to the rotor housing 26, the tip concave portion 121 and the convex portion 511 no longer contact and the guide ribs 5121 formed on the inner peripheral surface of the assembly guide 512 no longer contact the motor shaft 12 Therefore, the situation where the motor is locked due to the friction between the tip concave part 121 and the convex part 511 and the situation where the rotational speed of the rotor 14 is reduced can be avoided.

In addition, since the guide rib 5121 formed on the inner circumferential surface of the projection 511 projecting from the rotation center of the fan 50 toward the motor shaft 12 and the inner peripheral surface of the assembly guide 512 does not wear, generation of dust due to wear can be prevented. .

Fourth Embodiment
The fan drive device according to the fourth embodiment will be described with reference to FIG. In the fan drive device of the first embodiment, the convex portion 511 formed on the center part 51 has a conical shape. On the other hand, in the fan drive device of the present embodiment, the tip of the convex portion 511 formed on the center part 51 is rounded.

Thus, the tip of the convex portion 511 formed on the center part 51 can be configured to be rounded.

Fifth Embodiment
The fan drive device according to the fifth embodiment will be described with reference to FIG. The fan drive device of the first embodiment has a convex portion 511 that protrudes toward the motor shaft 12 from the rotation center of the fan 50, and further, one end of the motor shaft 12 on the tip end face of the other end of the motor shaft 12. A tip concave portion 121 recessed to the side is formed. On the other hand, the fan drive device of the present embodiment has a recessed portion 513 recessed from the rotation center of the fan 50 to the opposite side to the motor shaft 12 side, and further, the motor shaft 12 at the other end of the motor shaft 12. The tip convex part 122 which protrudes on the other end side of is formed.

Then, the tip convex portion 122 is fitted in the concave portion 513, and the rotation center of the fan 50 and the axial center of the motor shaft 12 are in agreement.

In this embodiment, when the operator assembles the fan 50 into the rotor housing 26, first, the rotor housing 26 and the fan 50 are prepared, and then the motor shaft 12 is formed in the recess 513 formed in the rotation center of the fan 50. The formed tip convex portion 122 is fitted. As a result, the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other.

Next, the positions of the holes 521 formed in the insert portion 52 of the fan 50 and the screw holes 261 formed in the rotor housing 26 are matched. In this state, each screw 81 is rotated using a tool, and the fan 50 is screwed into each screw hole 261 formed in the rotor housing 26. Thus, the fan 50 is assembled to the rotor housing 26 so that the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other.

As described above, the guide portion has the concave portion 513 recessed from the rotation center of the fan 50 to the opposite side to the motor shaft 12 side, and the other end of the motor shaft 12 has the other end of the motor shaft 12 The tip convex part 122 which protrudes to the end side is formed. Then, the tip convex portion 122 is fitted in the concave portion 513 so that the rotation center of the fan 50 and the axial center of the motor shaft 12 coincide with each other.

As described above, the tip convex portion 122 is fitted in the concave portion 513 so that the rotation center of the fan 50 and the axial center of the motor shaft 12 can be aligned.

Sixth Embodiment
A fan drive device according to a sixth embodiment will be described with reference to FIG. In the fan drive device of the first embodiment, the cross-sectional shape orthogonal to the axial direction of the assembly guide 512 in the plurality of guide ribs 5121 formed on the center part 51 is fan-shaped. On the other hand, in the fan drive device of this embodiment, the cross-sectional shape of the guide rib 5121 orthogonal to the axial direction of the assembly guide 512 is semicircular. That is, the tips of the plurality of guide ribs 5121 formed on the center part 51 are rounded. Thus, the tips of the plurality of guide ribs 5121 can be configured to be rounded.

Seventh Embodiment
A fan drive device according to a seventh embodiment will be described with reference to FIG. In the fan drive device of the present embodiment, the cross-sectional shape orthogonal to the axial direction of the assembly guide 512 in the guide rib 5121 is U-shaped. That is, the tips of the plurality of guide ribs 5121 formed on the center part 51 are rounded. Thus, the tips of the plurality of guide ribs 5121 can be configured to be rounded.

Eighth Embodiment
The fan drive device according to the eighth embodiment will be described with reference to FIG. The fan drive device according to the third embodiment has a convex portion 511 projecting toward the motor shaft 12 from the rotation center of the fan 50, and further, one end of the motor shaft 12 on the tip end face of the other end of the motor shaft 12. A tip concave portion 121 recessed to the side is formed. On the other hand, the fan drive device of the present embodiment has a recessed portion 513 recessed from the rotation center of the fan 50 to the opposite side to the motor shaft 12 side, and further, the motor shaft 12 at the other end of the motor shaft 12. The tip convex part 122 which protrudes on the other end side of is formed.

The spring member 80 biases the rotor housing 26 to the other end side of the motor shaft 12. Further, the center part 51 is formed with a recess 513 which is recessed from the rotation center of the fan 50 to the side opposite to the motor shaft 12 side. At the tip of the other end of the motor shaft 12, a tip convex portion 122 that protrudes to the other end of the motor shaft 12 is formed.

Then, when the rotor housing 26 is pressed to one end side of the motor shaft 12, the tip convex portion 122 is fitted in the concave portion 513, and the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other. .

In the present embodiment, when the operator assembles the fan 50 to the rotor housing 26, first, the rotor housing 26 and the fan 50 are prepared, and then the rotor housing 26 is the motor shaft against the biasing force of the spring member 80. Press to one end of 12. At this time, the motor shaft 12 is guided such that the axial center of the motor shaft 12 coincides with the axial center of the assembly guide 512 by the recess 513 formed in the center part 51.

In this state, the positions of the holes 521 formed in the insert portion 52 of the fan 50 and the screw holes 261 formed in the rotor housing 26 are matched, and the screws 81 are rotated using a tool, and the fan 50 is rotated. Screws are fixed to respective screw holes 261 formed in the rotor housing 26. Thus, the fan 50 is assembled to the rotor housing 26 so that the axis of the motor shaft 12 and the rotation center of the fan 50 coincide with each other.

As described above, the fan drive device of the present embodiment includes the spring member 80 that biases the rotor housing 26 to the other end side of the motor shaft 12, and the guide portion is the motor shaft 12 from the rotation center of the fan 50. It has a recess 513 recessed on the side opposite to the side. At the other end of the motor shaft 12 is formed a tip convex portion 122 which protrudes to the other end of the motor shaft 12. Then, when the rotor housing 26 is pressed to one end side of the motor shaft 12, the tip convex portion 122 is fitted in the concave portion 513, and the rotation center of the fan 50 and the axis of the motor shaft coincide.

Thus, when the rotor housing 26 is pressed to one end side of the motor shaft 12, the tip convex portion 122 is fitted in the recess 513, and the rotation center of the fan 50 and the axis of the motor shaft 12 coincide with each other. Can be configured to be

Further, after the fan 50 is assembled to the rotor housing 26, the recess 513 does not contact the tip protrusion 122, so that the motor may be locked due to the contact between the recess 513 and the tip protrusion 122. It is possible to avoid a situation in which the number of revolutions decreases.

(Other embodiments)
(1) In the above embodiments, the fan 50 is screwed to the rotor housing 26 using the screw 81. However, the present invention is not limited to the screw fixing. For example, the fan can be fixed to the rotor housing by welding. .

(2) In the second embodiment, with respect to the fan drive device of the first embodiment, the convex portion 511 formed in the center part 51 is deleted, and the assembly guide 512 formed in the center part 51; The guide portion is constituted by the plurality of guide ribs 5121.

On the other hand, in the fan drive device according to the first embodiment, the assembly guide 512 formed on the center part 51 and the plurality of guide ribs 5121 are deleted, and the convex portion 511 formed on the center part 51 guides You may constitute a part.

(3) In the fan drive device of the third embodiment, the guide is formed by the assembly guide 512 formed on the center part 51 and the plurality of guide ribs 5121, and the protrusion 511 formed on the center part 51. The guidance unit was configured.

On the other hand, the convex portion 511 formed on the center part 51 may be deleted, and the guide may be configured by the assembly guide 512 formed on the center part 51 and the plurality of guide ribs 5121. Further, the guide may be configured by the convex portion 511 formed on the center part 51 by deleting the assembly guide 512 formed on the center part 51 and the plurality of guide ribs 5121.

In addition, this indication is not limited to above-mentioned embodiment, and can be changed suitably. Moreover, said each embodiment is not mutually irrelevant and can be combined suitably, unless the combination is clearly impossible. Further, in each of the above-described embodiments, it is needless to say that the elements constituting the embodiment are not necessarily essential except when clearly indicated as being essential and when it is considered to be obviously essential in principle. Yes. Further, in the above embodiments, when numerical values such as the number, numerical value, amount, range, etc. of constituent elements of the embodiment are mentioned, it is clearly indicated that they are particularly essential and clearly limited to a specific number in principle. It is not limited to the specific number except when it is done. Further, in the above embodiments, when referring to materials, shapes, positional relationships, etc. of constituent elements etc., unless specifically stated otherwise or in principle when limited to a specific material, shape, positional relationship, etc., etc. It is not limited to the material, the shape, the positional relationship, etc.

(Summary)
According to a first aspect of the present invention shown in part or all of each of the above embodiments, the fan drive device includes a motor shaft fixed at one end to a center piece, and a rotor housing that rotates about an axis of the motor shaft. And a rotor having Furthermore, a fan fixed to the rotor housing and rotating integrally with the rotor housing is provided. And a fan has a guide part for guiding a motor shaft so that an axial center of a motor shaft and a rotation center of a fan may correspond by fitting with a motor shaft.

Further, according to the second aspect, the guide portion has a convex portion projecting from the rotation center of the fan toward the motor shaft, and the tip end surface of the other end of the motor shaft is recessed toward the one end of the motor shaft There is formed an end concave portion. And a convex part is fitted to a tip crevice, and it is in the state where the rotation center of a fan and the axial center of a motor shaft corresponded.

As described above, the protrusion can be fitted in the tip end recess so that the rotation center of the fan and the axis of the motor shaft coincide with each other.

Further, according to the third aspect, the guide portion has a concave portion recessed from the rotation center of the fan to the opposite side to the motor shaft side, and the other end side of the motor shaft is provided at the other end of the motor shaft The tip convex part which protrudes to is formed. And a tip convex part is fitted in a crevice, and it is in the state where the rotation center of a fan and the axial center of a motor shaft corresponded.

As described above, the tip convex portion is fitted in the concave portion so that the rotation center of the fan and the axial center of the motor shaft can be aligned.

Further, according to the fourth aspect, the guide portion is a cylindrical portion so that the cylindrical portion protruding from the rotation center of the fan to the motor shaft side, and the shaft center of the motor shaft coincides with the rotation center of the fan. And a plurality of guide ribs projecting in the axial direction of the cylindrical portion from the inner circumferential surface of the housing. Then, the motor shaft is fitted into the inside of the cylindrical portion, and the rotation center of the fan and the axis of the motor shaft coincide with each other.

As described above, the motor shaft can be fitted inside the cylindrical portion so that the center of rotation of the fan and the axis of the motor shaft coincide with each other.

Further, according to the fifth aspect, a spring member for urging the rotor housing to the other end side of the motor shaft is provided, and the guide portion has a convex portion projecting to the motor shaft side from the rotation center of the fan. . Further, on the tip end surface on the other end side of the motor shaft, there is formed a tip recess recessed on one end side of the motor shaft. Then, when the rotor housing is pressed to one end side of the motor shaft, the convex portion is fitted to the end concave portion, and the rotation center of the fan and the shaft center of the motor shaft are in agreement.

As described above, when the rotor housing is pressed to one end side of the motor shaft, the projection is fitted in the tip end recess so that the rotation center of the fan and the shaft center of the motor shaft coincide with each other. Can.

In addition, since the tip concave portion and the convex portion do not contact after the fan is assembled to the rotor housing, the motor is locked due to the friction between the tip concave portion and the convex portion, and the rotational speed of the rotor 14 It is also possible to avoid a situation where it will decline.

Further, according to the sixth aspect, a spring member is provided which biases the rotor housing to the other end side of the motor shaft. Further, the guide portion has a concave portion recessed from the rotation center of the fan to the opposite side to the motor shaft side, and a tip convex portion protruding to the other end side of the motor shaft is formed at the other end of the motor shaft It is done. Then, when the rotor housing is pressed to one end side of the motor shaft, the tip convex portion is fitted in the concave portion, and the rotation center of the fan and the shaft center of the motor shaft coincide with each other.

Thus, when the rotor housing is pressed to one end side of the motor shaft, the tip convex portion is fitted in the recess so that the rotation center of the fan and the shaft center of the motor shaft coincide with each other. Can.

In addition, since the recess and the tip protrusion do not contact after the fan is assembled to the rotor housing, the motor may be locked due to the friction between the recess and the tip protrusion, and the rotational speed of the rotor 14 It is also possible to avoid a situation where it will decline.

Further, according to the seventh aspect, a spring member is provided which biases the rotor housing to the other end side of the motor shaft. Further, the guide portion is a cylindrical portion projecting from the rotation center of the fan toward the motor shaft, and the inner peripheral surface of the cylinder portion so that the shaft center of the motor shaft and the rotation center of the fan coincide. And a plurality of guide ribs projecting in the axial direction of the Then, when the rotor housing is pressed to one end side of the motor shaft, the motor shaft is fitted inside the cylindrical portion, and the rotation center of the fan and the shaft center of the motor shaft coincide with each other.

Thus, when the rotor housing is pressed to one end side of the motor shaft, the motor shaft is fitted inside the cylindrical portion so that the rotation center of the fan and the shaft center of the motor shaft coincide with each other. can do.

In addition, since the plurality of guide ribs and the motor shaft do not contact after the fan is assembled to the rotor housing, the motor is locked due to the friction between the plurality of guide ribs and the motor shaft, and the number of rotations of the rotor Can be avoided.

Further, according to the eighth aspect, the convex portion has a conical shape or a polygonal pyramid shape. Therefore, with the rotation of the rotor, the tip of the protrusion is easily worn away by the friction with the tip recess, and the protrusion can be prevented from coming into contact with the tip recess promptly.

Further, according to the ninth aspect, the plurality of guide ribs are formed with corner portions at their tips. Therefore, with the rotation of the rotor, the tips of the plurality of guide ribs easily wear due to the friction with the motor shaft, and the plurality of guide ribs can be prevented from contacting the motor shaft promptly.

Further, according to the tenth aspect, the tip convex portion has a conical shape or a polygonal pyramid shape. Therefore, with the rotation of the rotor, the recess is apt to wear due to the friction with the tip protrusion, and the tip protrusion can be prevented from contacting the recess promptly.

Further, according to the eleventh aspect, the guide portion is made of resin. Therefore, with the rotation of the rotor, the guide portion is easily worn due to the friction with the motor shaft, and the guide portion can be prevented from contacting the motor shaft promptly.

Further, according to the twelfth aspect, the fan has a resin center part in which the guide part is formed, and a metal insert part arranged so as to spread around the center part. The fan is assembled to the rotor housing by screw-fixing the insert portion to the rotor housing using a screw.

Thus, since the fan is assembled to the rotor housing 26 by screw-fixing the metal insert portion to the rotor housing using a screw, the strength of the fan can be secured.

Further, according to the thirteenth aspect, the fan has a blade made of resin. Therefore, for example, the weight can be reduced as compared to the case where the blade is made of metal.

The convex portion 511, the assembly guide 512, the guide rib 5121 and the concave portion 513 in the above embodiment correspond to the guide portion.

Claims

A fan drive and
A motor shaft (12) fixed at one end to the center piece (18);
A rotor (14) having a rotor housing (26) that rotates about the axis of the motor shaft;
A fan (50) fixed to the rotor housing and rotating integrally with the rotor housing;
The fan has a guide portion (511, 512, 5121, 513) for guiding the motor shaft so that the axis of the motor shaft and the rotation center of the fan coincide with each other by fitting with the motor shaft. Fan drive.
The guide portion has a convex portion (511) projecting toward the motor shaft from the rotation center of the fan,
A tip end recess (121) recessed on one end side of the motor shaft is formed on the tip end surface of the motor shaft on the other end side,
The fan drive device according to claim 1, wherein the convex portion is fitted in the tip end concave portion, and a rotation center of the fan and an axial center of the motor shaft are in agreement.
The guide portion has a recess (513) recessed from the rotation center of the fan to the side opposite to the motor shaft side,
At the tip of the other end side of the motor shaft, a tip convex portion (122) projecting to the other end side of the motor shaft is formed,
The fan drive device according to claim 1, wherein the tip convex portion is fitted in the concave portion, and a rotation center of the fan and an axial center of the motor shaft are in agreement.
The guiding portion is a cylindrical portion (512) of a cylindrical shape which protrudes toward the motor shaft from the rotation center of the fan;
And a plurality of guide ribs (5121) protruding in the axial center direction of the cylindrical portion from the inner circumferential surface of the cylindrical portion such that the axial center of the motor shaft and the rotational center of the fan coincide with each other.
The fan drive according to any one of claims 1 to 3, wherein the motor shaft is fitted inside the cylindrical portion, and the rotation center of the fan and the shaft center of the motor shaft are in agreement. apparatus.
A spring member (80) for urging the rotor housing toward the other end of the motor shaft;
The guide portion has a convex portion (511) projecting toward the motor shaft from the rotation center of the fan,
A tip end recess (121) recessed on one end side of the motor shaft is formed on the tip end surface of the motor shaft on the other end side,
When the rotor housing is pressed to one end side of the motor shaft, the convex portion is fitted in the tip end recess, and the rotation center of the fan and the shaft center of the motor shaft are aligned. The fan drive device according to 1.
A spring member (80) for urging the rotor housing toward the other end of the motor shaft;
The guide portion has a recess (513) recessed from the rotation center of the fan to the side opposite to the motor shaft side,
At the tip of the other end side of the motor shaft, a tip convex portion (122) projecting to the other end side of the motor shaft is formed,
When the rotor housing is pressed to one end side of the motor shaft, the tip convex portion is fitted in the concave portion, and the rotation center of the fan and the axis of the motor shaft are aligned. The fan drive device according to 1.
A spring member (80) for urging the rotor housing toward the other end of the motor shaft;
The guiding portion is a cylindrical portion (512) of a cylindrical shape which protrudes toward the motor shaft from the rotation center of the fan;
And a plurality of guide ribs (5121) protruding in the axial center direction of the cylindrical portion from the inner circumferential surface of the cylindrical portion such that the axial center of the motor shaft and the rotational center of the fan coincide with each other.
When the rotor housing is pressed to one end side of the motor shaft, the motor shaft is fitted inside the cylindrical portion, and the rotation center of the fan and the shaft center of the motor shaft coincide with each other. The fan drive device according to claim 1.
The fan drive device according to claim 2, wherein the convex portion has a conical shape or a polygonal pyramid shape.
The fan drive device according to claim 4 or 7, wherein a corner portion is formed at a tip end of the plurality of guide ribs.
The fan drive device according to claim 3, wherein the tip convex portion has a conical shape or a polygonal pyramid shape.
The fan drive device according to any one of claims 1 to 10, wherein the guide part is made of resin.
The fan has a resin center part (51) on which the guide part is formed, and a metal insert part (52) disposed so as to extend around the center part,
The fan drive device according to any one of claims 1 to 10, wherein the fan is assembled to the rotor housing by screwing the insert portion to the rotor housing using a screw (81).
The fan drive device according to any one of claims 1 to 12, wherein the fan comprises a resin blade (54).