JP2013106364A - Fan motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fan motor in which vibration of a motor can be suppressed effectively while the fan motor is fixed to a mounting position.SOLUTION: A first screw hole 67 of a bearing cover 60 mounted in a bearing cover accommodation part 50 of a bearing housing 20 is utilized to fix a fan motor 1 to a casing 80 through screwing. The first screw hole 67 is matched on an extension of the axial center of a rotary shaft 32 of a rotor 30, such that the vicinity of the center of gravity of a motor 39 around the rotary shaft 32 is fixed to the casing 80 via the bearing cover 60. Therefore, vibration of the motor can be suppressed easily and a stable rotation state of the motor 39 can be obtained.

Description

  The present invention relates to a fan motor that pumps air by rotating blades with a motor.

  For example, a small centrifugal or axial fan type fan motor for cooling the inside of a casing or individual electronic components is attached to an electronic device such as a personal computer or an OA device on which electronic components are mounted. In order to attach this type of fan motor to a predetermined member (hereinafter referred to as an attachment member) such as a casing, a casing, a frame, or the like that supports the motor and the fan is exclusively fixed to the attachment member. For example, when the casing is fixed to the attachment member, there are many methods of screwing using a plurality of screw holes provided in the casing (for example, Patent Document 1). However, in this case, since the screw hole is separated from the center of gravity of the motor, the vicinity of the center of gravity of the motor is difficult to be fixed to the mounting member, which is a disadvantageous fixing structure from the viewpoint of suppressing the vibration of the motor. In order to fix the vicinity of the center of gravity of the motor, it can be considered that the mounting member is screwed through a member disposed on the extension line of the rotation shaft of the rotor disposed near the center of gravity of the motor. Examples of such a member include a circuit board (Patent Document 2) and a claw engagement type cap (Patent Document 3).

JP 2003-269393 A JP 2008-106739 A JP 2004-40926 A

  It is difficult to form screw holes in the circuit board because it is thin, and the circuit board has low strength in the first place. Further, in the case of the cap as described above, there is a risk that the claw may be damaged when stress is applied. That is, in any case, it is inappropriate as a member for fixing to the attachment member.

  The present invention has been made in view of the above circumstances, and a main object thereof is to provide a fan motor capable of effectively suppressing vibration of the motor in a state of being fixed to the mounting member.

  The fan motor of the present invention includes a rotor having a rotating shaft and blades on the outer peripheral portion, and a cylindrical bearing into which the rotating shaft is inserted and rotatably supports the rotating shaft via a bearing. In a fan motor including a housing and a motor that is disposed around the rotation shaft and rotationally drives the rotor, the bearing housing is open at both ends, and a bearing cover housing portion is formed on one of the opening sides. A bearing cover that closes the opening is detachably attached to the bearing cover housing portion, and the outer surface of the bearing cover is mounted on an extension line of the axis of the rotary shaft in a state of being attached to the bearing cover housing portion. A first screw fixing hole is formed in the vicinity or in the vicinity of the coincidence.

  The fan motor of the present invention can be fixed to the mounting member by screwing using the first screw fixing hole of the bearing cover mounted in the bearing cover housing portion of the bearing housing. Since the first screw fixing hole is formed in the vicinity of the extension line of the axis of the rotary shaft of the rotor or in the vicinity thereof, the vicinity of the center of gravity of the motor around the rotary shaft is attached to the mounting member via the bearing cover. It will be fixed to. For this reason, the vibration of the motor is easily suppressed, and a stable rotation state of the motor can be obtained.

  In the present invention, the bearing cover is rotatably accommodated in the bearing cover accommodating portion with the axial direction of the rotating shaft as the rotational axis direction, and a plurality of convex portions protruding in the outer peripheral direction are formed on the outer peripheral portion thereof. By rotating the bearing cover inserted into the bearing cover housing portion on the inner circumferential surface of the bearing cover housing portion that faces the outer circumferential surface of the bearing cover, the convex portion of the bearing cover is moved in the axial direction. It includes a form in which an engaging portion is formed that engages with the bearing cover. This form is a specific mounting form of the bearing cover to the bearing cover housing portion of the bearing housing, and the bearing cover is housed in the bearing cover housing portion by a simple operation of inserting and rotating the bearing cover into the bearing cover housing portion. be able to.

  Further, according to the present invention, the bearing cover is fixed to the bearing housing by a screw member in the mounted state in which the convex portion is engaged with the engaging portion, and the screw member is inserted into the bearing cover. A screw insertion hole is formed, and the bearing housing includes a form in which a second screw fixing hole into which the screw member is screwed is formed. In this embodiment, since the convex portion of the bearing cover engages with the bearing cover housing portion and the bearing cover is screwed to the bearing housing, the bearing cover can be firmly fixed to the bearing housing.

  Further, the present invention includes a form in which the bearing cover can be inserted only into the bearing cover housing portion at a specific rotational angle position. In this embodiment, it is possible to easily match the screw insertion hole of the bearing cover with the second screw fixing hole on the bearing housing side.

  Further, according to the present invention, in the bearing cover and / or the bearing cover housing portion, the convex portion engages with the engaging portion, and the screw member coincides with the second screw fixing hole. Including a positioning means for positioning the bearing cover. Even in this form, it is possible to easily match the screw insertion hole of the bearing cover with the second screw fixing hole on the bearing housing side.

  Advantageous Effects of Invention According to the present invention, there is an effect that a fan motor that can effectively suppress vibration of the motor in a fixed state to the attachment member is provided.

It is sectional drawing of the fan motor which concerns on one Embodiment of this invention. It is a figure which shows the bearing cover accommodating part of the fan motor of one Embodiment, (a) is a perspective view, (b) is a bottom view. It is a figure which shows the bearing cover of the fan motor of one Embodiment, (a) is a perspective view, (b) is a bottom view. It is a bottom view which shows the attachment procedure of the bearing cover to a bearing cover accommodating part in order of (a)-(c). It is sectional drawing which shows the attachment procedure of the bearing cover to a bearing cover accommodating part in order of (a)-(c). It is the whole perspective view which shows the attachment procedure of the bearing cover to a bearing cover accommodating part in order of (a)-(c). It is an enlarged view which shows the attachment structure part of the bearing cover to the bearing cover accommodating part of FIG. It is a figure which shows the other example of the combination shape for enabling a bearing cover to be inserted only in a specific rotation angle position in a bearing cover accommodating part. It is a figure which shows the further another example of this combination shape.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a longitudinal section of a centrifugal fan type fan motor 1 according to an embodiment. In the figure, a bearing housing 20 is erected near the center of the base portion 11. The bearing housing 20 includes a cylindrical bearing portion 21 having openings 21a and 21b at both ends, and a flange portion 22 formed at an end portion of the bearing portion 21 on the base portion 11 side. The base part 11 is integrally formed or fixed to be integrated. The outer surface of the base part 11 and the flange part 22 forms the same plane.

  In the bearing portion 21 of the bearing housing 20, a rotating shaft 32 is rotatably supported coaxially with the bearing portion 21 via a pair of bearings 31 made of ball bearings and the like that are separated in the axial direction. The tip of the rotating shaft 32 (upper end in FIG. 1) protrudes from the opening 21a on the opposite side (upper side in FIG. 1) of the bearing portion 21 and the center of the hub 33 constituting the rotor 30 is at the tip. It is fixed.

  The hub 33 is formed in a cup shape, and a plurality of centrifugal fan type blades 35 are integrally formed on the outer peripheral surface of the hub 33 to constitute an impeller 34. A yoke 36 is fixed to the inner peripheral surface of the impeller 34, that is, the hub 33, and a rotor magnet 37 made of a permanent magnet is fixed to the inner peripheral surface of the yoke 36. The rotor 30 is constituted by the rotary shaft 32 and the hub 33 having blades 35 formed on the outer peripheral portion and the yoke 36 and the rotor magnet 37 fixed on the inner peripheral portion.

  A stator 40 is disposed and fixed on the outer peripheral surface of the bearing portion 21 of the bearing housing 20 so as to face the rotor magnet 37 with a gap. The stator 40 includes an iron core 41 extending radially toward the rotor magnet 37, an insulator 42 attached to the iron core 41, and a coil 43 wound around the insulator 42. The stator 40 and the rotor magnet 37 constitute a motor 39 that rotationally drives the rotor 30. A circuit board 38 that controls the rotational drive of the rotor 30 is disposed below the stator 40 in FIG.

  In the motor 39, a current is passed through the coil 43 via the circuit board 38, and the current is controlled by the drive circuit of the circuit board 38, so that the iron core 41 is sequentially excited, thereby rotating the rotor 30 in a certain direction. . When the rotor 30 rotates in a certain direction, the blades 35 that rotate integrally generate a blowing action corresponding to the rotation.

  A recess is formed as a bearing cover housing portion 50 on the lower surface in FIG. 1 of the bearing housing 20 on the opening 21b side of the bearing portion 21 on the base portion 11 side. The bearing cover housing portion 50 is formed by a cylindrical inner peripheral surface 51 concentric with the bearing portion 21 and a bottom surface 52 orthogonal to the axial direction of the bearing portion 21 as shown in FIG. A bearing cover 60 is accommodated in the bearing cover accommodating portion 50 and is detachably mounted. As a result, the opening 21 b through which the rotary shaft 32 is exposed is closed by the bearing cover 60.

  Further, as shown in FIG. 2A, the bearing cover housing portion 50 is formed with a plurality of (in this case, three) arc-shaped convex portions 55 projecting in the inner circumferential direction on the opening side. An arcuate recess 54 is formed between the portions 55. The convex portion 55 and the concave portion 54 are formed concentrically with the bearing portion 21. Grooves 53 along the circumferential direction are formed between the convex portion 55 and the bottom surface 52, and a stopper portion 58 that closes the groove 53 is formed on one end side of the grooves 53.

  As shown in FIG. 3A, the bearing cover 60 is generally disc-shaped as a whole, and the disc portion 61 has discs with different heights at the center of both end faces. Shaped boss portions 62 and 63 are respectively formed. Here, the surface on which the lower boss portion 62 is formed is the front surface 60a, and the surface on which the higher boss portion 63 is formed is the back surface 60b. The outer diameter of the boss portion 63 is slightly smaller than the inner diameter of the lower end portion of the bearing portion 21, and when the bearing cover 60 is inserted into the bearing cover housing portion 50, the boss portion 63 on the back surface 60 b side is the lower end of the bearing portion 21. It fits inside the part.

  A plurality of (in this case, three) flange-shaped convex portions 64 projecting in the outer peripheral direction are formed on the outer peripheral surface of the disc portion 61, and a concave portion 65 is formed between the convex portions 64. These convex portions 64 project from the outer peripheral surface concentrically with the disc portion 61 and have a constant thickness but are thinner than the disc portion 61, and the surface on the back surface 60b side is flush with the back surface 60b. ing.

  A plurality of screw insertion holes 66 are formed around the boss portions 62 and 63 of the disc portion 61. In this case, the two screw insertion holes 66 are formed at equal intervals in the circumferential direction, that is, at positions separated from each other by 180 ° in the circumferential direction. A counterbore 66a is formed around the surface 60a of the screw insertion hole 66. A first screw hole 67 that opens to the surface 60a side is formed in the center of the bearing cover 60. The first screw hole 67 is a non-penetrating blind hole that opens only on the front surface 60a side, and has a depth from the boss portion 62 on the front surface 60a side to the middle of the boss portion 63 on the back surface 60b side.

  The bearing cover 60 is attached to the bearing cover housing portion 50 by the procedure shown in FIGS. 4 (a) to 4 (c) and FIGS. 5 (a) to 5 (c).

  Further, as shown in FIG. 2A, a second screw hole 56 is formed in the bearing cover housing portion 50 at a predetermined location on the bottom surface 52. The second screw holes 56 correspond to the screw insertion holes 66 of the bearing cover 60, and are formed at two positions at equal intervals in the circumferential direction, that is, at positions 180 ° apart from each other in the circumferential direction.

  As shown in FIG. 3B, the three convex portions 64 on the bearing cover 60 side are not uniform in length in the circumferential direction, and are of two types. The circumferential lengths of the two convex portions 64B and 64C ( B, C) are the same, and the circumferential length (A) of the other one convex portion 64A is shorter than the convex portions 64B, 64C. Further, the interval between the convex portions 64, that is, the circumferential length of the concave portion 65 is the same length.

  The concave portion 54 and the convex portion 55 on the bearing cover housing portion 50 side correspond to the convex portion 64 and the concave portion 65 on the bearing cover 60 side, and the opening of the bearing cover housing portion 50 formed by the concave portion 54 and the convex portion 55. As shown in FIG. 4A, the edge has a shape that matches the outer edge of the bearing cover 60 so that the bearing cover 60 can be inserted exactly into the inside. That is, the inner diameter of the concave portion 54 of the bearing cover housing portion 50 is slightly larger than the outer diameter of the convex portion 64 of the bearing cover 60, and the inner diameter of the convex portion 55 of the bearing cover housing portion 50 is that of the concave portion 65 of the bearing cover 60. It is set slightly larger than the outer diameter. The circumferential lengths of the two concave portions 54B and 54C are slightly shorter than the convex portions 64B and 64C of the bearing cover 60, and the circumferential length of the other concave portion 54A is shorter than the convex portion 64A of the bearing cover 60. It is slightly shorter.

  In the bearing cover 60, the convex portion 64A having the same circumferential length is aligned with the concave portion 54A, and the convex portions 64B and 64C are aligned with the concave portions 54B and 54C, with the surface 60a side exposed to the bearing cover housing portion 50. Thus, as shown in FIG. This state is shown in FIG.

  When the bearing cover 60 is inserted into the bearing cover housing portion 50, the boss 63 on the back surface 60 b side is fitted into the lower end portion of the bearing portion 21, and the back surface 60 b comes into contact with the bottom surface 52. From this inserted state, the bearing cover 60 is rotated in a predetermined direction, in this case, in the clockwise direction (the arrow direction in FIG. 4A). The width of the groove 53 is slightly smaller than the thickness of the convex portion 64 of the bearing cover 60 as shown in FIG. 5 (b), and is set to a size that allows the convex portion 64 to enter and fit. 64 fits into the groove 53 and eventually the convex portion 64 abuts against the stopper portion 58 as shown in FIG. At this time, as shown in FIG. 5B, the convex portion 64 on the bearing cover 60 side is engaged with the convex portion 55 of the bearing cover accommodating portion 50 so as to overlap in the axial direction. At the same time, the screw insertion hole 66 of the bearing cover 60 coincides with the second screw hole 56 opened in the bottom surface 52 of the bearing cover housing portion 50. In this state, the bearing cover 60 is maintained in a state where it cannot be removed from the bearing cover housing portion 50.

  Thereafter, as shown in FIGS. 4C and 5C, the screw 71 passed through the screw insertion hole 66 is screwed into the second screw hole 56 and fastened, whereby the bearing cover 60 is fixed to the bearing housing 20. Fixed to. FIG. 6 shows the overall procedure from the insertion of the bearing cover 60 into the bearing cover housing 50 to the fixing with the screw 71, and FIG. 6 (a) shows the bearing cover 60 as an arrow to the bearing cover housing 50. 6 (b) shows that the bearing cover 60 is rotated in the direction of the arrow, and FIG. 6 (c) shows that the bearing cover 60 is fixed with the screw 71.

  As described above, the bearing cover 60 is fixed to the bearing housing 20, and in this fixed state, as shown in FIG. 5C, the bearing cover 60 and the screw 71 enter the bearing cover housing portion 50, and are on the surface 60a side. The surface of the boss portion 62 forms the same surface as the outer surface of the bearing housing 20 and does not protrude from the outer surface. Further, the axis of the first screw hole 67 of the bearing cover 60 coincides with the extension line of the axis of the rotation shaft 32 of the rotor 30.

  The fan motor 1 in which the bearing cover 60 is mounted in the bearing cover housing portion 50 as described above is fixed to an attachment member such as a casing or a frame using the first screw hole 67 of the bearing cover 60. FIG. 7 shows a state in which the fan motor 1 is fixed to the housing 80 of the device to be attached. That is, the fan motor 1 aligns the first screw hole 67 with the screw insertion hole 81 of the housing 80, and screws the screw 72 passed through the screw insertion hole 81 into the first screw hole 67 and fastens the housing. Fixed to the body 80. The housing 80 and the base portion 11 are in close contact with the housing 80.

  The fan motor 1 according to the embodiment is screwed to an attachment member such as the housing 80 using the first screw hole 67 of the bearing cover 60 mounted in the bearing cover housing portion 50 of the bearing housing 20. And can be fixed. Since the first screw hole 67 coincides with the extension line of the axis of the rotation shaft 32 of the rotor 30, the vicinity of the center of gravity of the motor 39 around the rotation shaft 32 is fixed to the housing 80 via the bearing cover 60. Will be. Therefore, vibration of the motor 39 can be effectively suppressed, and a stable rotation state of the motor 39 can be obtained.

  In addition, the bearing cover 60 can be accommodated in the bearing cover accommodating portion 50 by a simple operation of inserting the bearing cover 60 into the bearing cover accommodating portion 50 and rotating the bearing cover 60. From this accommodated state, the screw is inserted into the first screw hole 67. Then, the bearing cover 60 is firmly fixed to the bearing housing 20.

  Further, as shown in FIGS. 3B and 4A, the circumferential lengths of the plurality of convex portions 64 of the bearing cover 60 are made different (in this case, two types), and the bearing cover housing portion 50 side is changed. By forming the recesses 54 corresponding to the projections 64 in the openings, the bearing cover 60 can be positioned within a specific rotation angle position within the bearing cover housing 50, that is, the projections 64A can be aligned with the recesses 54A. Insertion is possible only when the portions 64B and 64C are at rotational angle positions that match the recesses 54B and 54C. When the bearing cover 60 thus inserted is rotated in a predetermined direction (in this case, clockwise), the convex portion 64 fits into the groove 53 and the convex portions 64 and 55 are engaged with each other, and the convex portion 64 is the stopper portion. When it hits 58, the accommodation state is held at a predetermined position. In this state, since the screw insertion hole 66 of the bearing cover 60 automatically matches the second screw hole 56 of the bearing housing 20, the screw insertion hole 66 can be easily aligned with the second screw hole 56. .

  In order to allow the bearing cover 60 to be inserted into the bearing cover housing portion 50 only at a specific rotational angle position, means for changing the circumferential lengths of the plurality of convex portions 64 as in the above embodiment is effective. However, it is not limited to this form. For example, as shown in FIG. 8, there is a mode in which the interval between the convex portions 64, that is, the circumferential length of the concave portion 65 is changed while the circumferential lengths of the plurality of convex portions 64 are the same. In this case, the circumferential lengths (E, F) of the two recesses 65E, 65F are the same, and the circumferential length (D) of the other recess 65D is shorter than the recesses 65E, 65F. The concave portion 54 and the convex portion 55 on the bearing cover housing portion 50 side are formed corresponding to the convex portion 64 and the concave portion 65 (65D, 65E, 65F) of the bearing cover 60.

  In addition, as shown in FIG. 9, there is a means for making the shape of the convex portion 64 different. In this case, the two convex portions 64H and 64I are substantially fan-shaped with the side surfaces at both ends in the circumferential direction and the outer peripheral surface of the disc portion 61 forming a substantially right angle, but both side surfaces of the other one convex portion 64G. The outer peripheral surface forms an obtuse angle and has a substantially trapezoidal shape. Accordingly, the concave portion 54 and the convex portion 55 of the bearing cover housing portion 50 are formed corresponding to the convex portion 64 (64G, 64H, 64I) and the concave portion 65 of the bearing cover 60.

  In the above embodiment, the screw 71 is screwed into the second screw hole 56 and fastened as a means for fixing the bearing cover 60 to the bearing housing 20. Instead of 71, a tapping screw may be screwed into the hole and fastened. This form can also be applied to the first screw hole 67. That is, the first screw hole 67 may be a simple hole, and a tapping screw may be screwed into the hole instead of the screw 72 to fix the fan motor 1 to the housing 80.

  Further, the first screw hole 67 of the bearing cover 60 is not limited to coincide with the extension line of the axis of the rotary shaft 32, and is slightly shifted from the axis of the rotary shaft 32 and coincides with the axis. The form currently formed in the vicinity may be sufficient.

  Furthermore, although the said embodiment is an example which applied this invention to the centrifugal fan type | mold fan motor, the fan motor of this invention is not limited to this form, For example, other types, such as an axial fan type fan motor, are mentioned. The same applies to the type of fan motor.

  DESCRIPTION OF SYMBOLS 1 ... Fan motor, 20 ... Bearing housing, 21a, 21b ... Opening, 30 ... Rotor, 31 ... Bearing, 32 ... Rotating shaft, 35 ... Blade, 39 ... Motor, 50 ... Bearing cover accommodating part, 55 ... Convex part (engagement) , 56 ... second screw hole (second screw fixing hole), 58 ... stopper part (positioning means), 60 ... bearing cover, 64 ... convex part, 66 ... screw insertion hole, 67 ... first Screw hole (first screw fixing hole), 71... Screw (screw member).

Claims (5)

A rotor having a rotating shaft and having blades on the outer periphery;
A cylindrical bearing housing in which the rotating shaft is inserted and rotatably supports the rotating shaft via a bearing;
A motor disposed around the rotating shaft and driving the rotor;
In the fan motor with
The bearing housing is open at both ends, and a bearing cover housing portion is formed on one of the opening sides,
A bearing cover that closes the opening is detachably attached to the bearing cover housing portion,
On the outer surface of the bearing cover, a first screw fixing hole is formed in the vicinity of or coincident with the extension line of the shaft center of the rotating shaft in a state where the bearing cover is mounted. Features a fan motor. The bearing cover is rotatably accommodated in the bearing cover accommodating portion with the axial direction of the rotating shaft as the rotational axis direction, and a plurality of convex portions protruding in the outer peripheral direction are formed on the outer peripheral portion thereof.
By rotating the bearing cover inserted into the bearing cover housing portion on the inner circumferential surface of the bearing cover housing portion that faces the outer circumferential surface of the bearing cover, the convex portion of the bearing cover is moved in the axial direction. The fan motor according to claim 1, further comprising an engaging portion that engages with the bearing cover in a mounted state.   The bearing cover is fixed to the bearing housing by a screw member in the mounted state in which the convex portion is engaged with the engaging portion, and a screw insertion hole through which the screw member is inserted is formed in the bearing cover. The fan motor according to claim 2, wherein the bearing housing is formed with a second screw fixing hole into which the screw member is screwed.   The fan motor according to claim 2 or 3, wherein the bearing cover can be inserted into the bearing cover housing portion only at a specific rotational angle position.   In the bearing cover and / or the bearing cover housing portion, the convex cover is engaged with the engaging portion, and the bearing cover is positioned so that the screw member coincides with the second screw fixing hole. 5. The fan motor according to claim 3, further comprising positioning means for performing the above operation.

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