JP2013017276A - Cooling fan for rotary electric machine and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling fan for a rotary electric machine that is easily mounted and removed to/from a rotating shaft while reductions in work man-hours and in a number of components and automation are being achieved, and further to provide the rotary electric machine.SOLUTION: A cooling fan for a rotary electric machine comprises: a boss portion 11 that has an inner peripheral wall portion 15 for forming a rotating shaft inserting hole 14; a plurality of fins 12 connected to an outer peripheral surface of the boss portion 11; an axial movement restricting section that has an engaging protrusion portion 17 protruding inside the boss portion 11 in a radial direction from the inner peripheral wall portion 15 of the boss portion 11 and restricts movement of the boss portion 11 in an axial direction; and a rotation restricting section that is provided on the inner peripheral wall portion 15 of the boss portion 11 extending in the axial direction and has a key 19 for restricting rotation of the boss portion 11 in a circumferential direction. On at least one of end surfaces of the boss portion 11 in the axial direction, a lightening hole 16 that is opened extending in the circumferential direction and extends inside the boss portion 11 toward the axial direction is formed. The engaging protrusion portion 17 is provided so as to be positioned at an inner peripheral side of the lightening hole 16.

Description

  Embodiments described herein relate generally to a cooling fan for a rotating electrical machine and the rotating electrical machine.

  There is a cooling fan that is attached to a rotating shaft of a rotating electrical machine and cools the rotating electrical machine from the outside of the casing. This cooling fan can be used, for example, by temporarily increasing the diameter of the rotary shaft insertion hole by a screw member penetrating the boss part, a fixing member such as a so-called C ring, or by thermal expansion due to heating, and inserting the rotary shaft. It is fixed to the rotating shaft by cooling and tightening (for example, see Patent Document 1). It is desirable that such a cooling fan can be easily attached to the rotating shaft from the viewpoint of reducing the number of work steps, the number of parts, or automation. Further, the cooling fan needs to be removed from the rotating shaft, for example, when discarding the rotating electrical machine or during maintenance for replacing the bearing member. Therefore, it is desirable that the cooling fan be easily detached from the rotating shaft.

JP 2000-14085 A

  The problem to be solved by the present invention is to provide a cooling fan for a rotating electrical machine and a rotating electrical machine that can be easily attached to and detached from the rotating shaft while reducing and automating work man-hours and the number of parts.

  According to the cooling fan of the rotating electrical machine of the embodiment, the boss portion having the inner peripheral wall portion that forms the rotation shaft insertion hole, the plurality of fins connected to the outer peripheral surface of the boss portion, and the diameter from the inner peripheral wall portion of the boss portion. An axial movement restricting portion that has an engaging convex portion that protrudes inward in the direction and restricts the movement of the boss portion in the axial direction, and extends in the axial direction on the inner peripheral wall portion of the boss portion. A rotation restricting portion having a key for restricting rotation in the direction, and the boss portion opens in the circumferential direction on at least one end surface in the axial direction, and the inside of the boss portion extends in the axial direction. A hole is formed, and the engaging convex portion is provided on the inner peripheral side of the lightening hole.

The figure which shows the cooling fan of 1st Embodiment typically. Sectional drawing in the II-II line of FIG. 1 of the cooling fan of 1st Embodiment BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the rotary electric machine of 1st Embodiment typically, (A) is an external view, (B) is the figure which fractured | ruptured a part of fan case It is a figure which shows typically the edge part of the rotating shaft of 1st Embodiment, (A) is the top view seen from the axial direction, (B) is the side view seen from arrow IVB of (A). The figure which shows typically the attachment procedure of the cooling fan of 1st Embodiment. The figure which shows the state which attached the cooling fan of 1st Embodiment to the rotating shaft from an axial direction The figure which shows typically the removal procedure of the cooling fan of 1st Embodiment. FIG. 1 equivalent view schematically showing the cooling fan of the second embodiment. FIG. 4 equivalent view schematically showing the end of the rotation shaft of the second embodiment. FIG. 2 equivalent view schematically showing the cooling fan of the third embodiment. FIG. 4 equivalent view schematically showing the end of the rotation shaft of the third embodiment. FIG. 5C equivalent view schematically showing a state in which the cooling fan of the third embodiment is attached. It is a figure which shows typically the cooling fan of 4th Embodiment, (A) is a figure equivalent to FIG. 1, (B) is a figure equivalent to FIG. 2 which shows the cross section in the XIIIB-XIIIB line | wire of (A). FIG. 4 equivalent view schematically showing the end of the rotating shaft of the fourth embodiment FIG. 5 equivalent view schematically showing the mounting procedure of the cooling fan of the fourth embodiment. FIG. 2 equivalent view schematically showing the cooling fan of the fourth embodiment. FIG. 1 equivalent view schematically showing a cooling fan according to another embodiment.

  Hereinafter, a cooling fan of a rotating electrical machine and a plurality of embodiments of the rotating electrical machine will be described with reference to the drawings. In the plurality of embodiments described below, substantially the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

(First embodiment)
Hereinafter, the cooling fan and the rotating electrical machine of the rotating electrical machine according to the first embodiment will be described with reference to FIGS. 1 to 7.

  As shown in FIG. 1, the cooling fan 10 according to the present embodiment includes a boss portion 11, a plurality of fins 12, and an inclined surface portion 13 that connects the fins 12. The boss portion 11 is formed in a substantially cylindrical shape, and has an inner peripheral wall portion 15 that forms a rotating shaft insertion hole 14 on the inner peripheral side thereof. In the present embodiment, the boss portion 11 is formed of a resin material having elasticity. As shown in FIG. 2, the inner peripheral wall portion 15 penetrates the boss portion 11 in the axial direction (left-right direction in the drawing). For this reason, the rotation shaft insertion hole 14 formed by the inner peripheral wall portion 15 is formed in a shape opened at both ends of the boss portion 11 in the axial direction. The rotary shaft insertion hole 14 has an inner diameter that is substantially the same as the diameter of a rotary shaft 23 (see FIGS. 3 and 4), which will be described later, and the rotary shaft 23 (see FIGS. 3 and 4 and the like). Inserted. Specifically, the inner diameter of the rotation shaft insertion hole 14 is substantially equal to the diameter of the rotation shaft 23 and is formed to be slightly larger with a clearance into which the rotation shaft 23 can be inserted. As described above, the boss portion 11 is formed in a cylindrical shape coaxial with the rotation shaft 23, and has an inner peripheral wall portion 15 that forms the rotation shaft insertion hole 14 on the inner peripheral side thereof.

  Further, as shown in FIG. 1, the boss portion 11 has a lightening hole 16, an engagement convex portion 17, a jig insertion hole 18, and a key 19. As shown in FIG. 2, the lightening hole 16 extends in the circumferential direction on one end face 11 a side (left side in the drawing) of the boss portion 11 and opens, and the inside of the boss portion 11 extends in the axial direction. Has been. Further, the end of the lightening hole 16 on the side opposite to the opening (right side in the figure) is formed to be tapered. The lightening hole 16 contributes to the weight reduction of the boss portion 11 and also functions as an elastic deformation mechanism described later in the present embodiment.

  The engaging convex part 17 (corresponding to the axial movement restricting part) is formed in a shape protruding from the inner peripheral wall part 15 inward in the radial direction. In other words, the engagement convex portion 17 protrudes in a direction in which the inner diameter of the rotation shaft insertion hole 14 is reduced in the rotation shaft insertion hole 14 having the substantially same inner diameter as the rotation shaft 23. As shown in FIGS. 1 and 2, the engagement convex portion 17 is located on the inner peripheral side of the opening of the lightening hole 16 in the inner peripheral wall portion 15, and on the end surface 11 a side of the boss portion 11, that is, It is provided at the end on the side where the lightening hole 16 is open. In the case of this embodiment, the engagement convex part 17 is formed in the shape protruded from the inner peripheral wall part 15 in the spherical shape. As will be described in detail later, the engagement convex portion 17 is large enough to be attached to the rotary shaft 23 and large enough that the engagement with the rotary shaft 23 is not released by thermal expansion during operation of the rotary electric machine 21 described later. Is formed. Further, as shown in FIG. 6 to be described later, the length L1 in the circumferential direction of the engaging convex portion 17 is formed to be smaller than the length L2 in the circumferential direction of the corresponding hollow hole 16 provided. ing.

  The jig insertion hole 18 is formed to open on the end surface 11a side of the boss portion 11, that is, on the side where the lightening hole 16 is open. Further, the jig insertion hole 18 is provided between the lightening hole 16 and the inner peripheral wall portion 15. In other words, the jig insertion hole 18 is provided between the engagement convex portion 17 and the lightening hole 16. As will be described later, a jig 28 (see FIG. 7) such as a minus driver is inserted into the jig insertion hole 18. The jig insertion hole 18 is formed so that its depth (length in the axial direction) is approximately the axial length of the engaging projection 17. Although the details will be described later, the jig insertion hole 18 may have a size that allows the engagement convex portion 17 to be moved outward in the radial direction with the jig 28 inserted.

  The key 19 (corresponding to the rotation restricting portion) is formed so as to protrude from the inner peripheral wall portion 15 to the inside in the radial direction of the boss portion 11. As shown in FIG. 1, the key 19 is formed in a substantially rectangular shape with a cross-sectional shape in the axial direction. That is, the key 19 formed so as to rise from the inner peripheral wall portion 15 has the wall portions 19a on both sides in the circumferential direction formed in a planar shape. Moreover, in this embodiment, the key 19 is provided in the inner peripheral side of the connection position 12a (position where the boss | hub part 11 and the fin 12 are connected) of the fin 12 mentioned later. The key 19 is engaged with a key groove 27 of the rotating shaft 23 described later.

  The fin 12 is connected to the outer peripheral surface of the boss portion 11 and is provided to extend radially outward from the boss portion 11. In the present embodiment, five fins 12 are provided at equal intervals in the circumferential direction of the boss portion 11. As shown in FIG. 2, the fin 12 is formed in a planar shape (on a plane including the axis of the rotation shaft 23) that extends in the axial direction. That is, the fin 12 extends perpendicularly to the boss portion 11, that is, in the normal direction of the boss portion 11 at the connection position 12 a connected to the boss portion 11. Here, “vertical” means a state that can be regarded as being substantially vertical, and includes a slightly inclined state.

  As shown in FIG. 1, the inclined surface portion 13 extends in the radial direction from the boss portion 11 and is formed in a fan shape that connects the fins 12. Further, as shown in FIG. 2, the inclined surface portion 13 is formed in a conical shape that spreads outward in the radial direction from the connection position 12 a toward the opposite side of the boss portion 11 (right side in the drawing) in the axial direction. For this reason, when the cooling fan 10 rotates, the air sucked in the central portion (near the boss portion 11) from the left in the axial direction is inclined along the inclined surface portion 13 outward in the radial direction. Flowing. That is, in this embodiment, a so-called mixed flow fan is employed as the cooling fan 10. The inclined surface portion 13 is provided with a through hole 20 used when removing a plurality of (for example, two) fans.

  The cooling fan 10 having such a configuration is attached to the rotating electrical machine 21 as shown in FIG. 3A shows the external appearance of the rotating electrical machine 21, and FIG. 3B shows the mounting position of the cooling fan 10. FIG. As shown in FIG. 3A, the rotating electrical machine 21 includes a casing 22 formed in a bottomed cylindrical shape with both ends in the axial direction closed, and a cylindrical shape provided in the casing 22 (not shown). A stator, a rotor (not shown) that is arranged on the inner peripheral side of the stator and is provided coaxially with the stator, and an end 22a in one axial direction (left side in the figure) of the housing 22 And a fan case 24 attached thereto.

  The casing 22 formed in a cylindrical shape is provided with a plurality of radiating fins 25 protruding on the outer surface in the radial direction and extending in a flat plate shape in the axial direction. The heat radiation fins 25 increase the surface area of the housing 22 to promote heat radiation, and form a ventilation path through which air flows between adjacent heat radiation fins 25 as will be described later. The rotating electrical machine 21 is supplied with a drive signal by, for example, inverter control from a drive circuit (not shown), and rotationally drives a drive target (not shown).

  The fan case 24 has a bottom 24a at the left end in the figure, and is formed in a bottomed cylindrical shape with an opening at the right end in the figure. The bottom 24a of the fan case 24 has an opening window formed in a mesh shape, for example, and functions as an inflow port through which air flows. As shown in FIG. 3B, the fan case 24 houses the cooling fan 10 therein. The fan case 24 has an inner diameter that is substantially the same as the outer diameter of the housing 22 including the heat radiation fins 25. For this reason, the air flowing in from the bottom 24a by the cooling fan 10 first flows radially outward along the inclined surface portion 13 of the cooling fan 10 as described above, and then collides with the inner wall of the fan case 24. A flow in the axial direction (right side in the figure) is formed. Then, the air in which the axial flow is formed is along a ventilation path formed by a gap between the inner wall of the fan case 24 and the housing 22, that is, a heat radiating fin 25 provided on the outer peripheral surface of the housing 22. Flowing. Thus, the cooling fan 10 functions as a so-called axial fan that forms an air flow in the axial direction on the surface of the rotating electrical machine 21 by being combined with the fan case 24.

  The rotating shaft 23 provided in the rotating electrical machine 21 is formed of a metal material. The rotating shaft 23 is rotatably supported by a bearing member (not shown) in the housing 22 (in this embodiment, a bearing). Both ends of the rotating shaft 23 protrude outside the housing 22. One end (right side in the figure) of the rotating shaft 23 is connected to a driving object (not shown), a drive transmission device that transmits the rotational force of the rotating shaft 23, and the like. The cooling fan 10 is attached to the other end portion 23b (left side in the drawing) of the rotating shaft 23.

  As shown in FIGS. 4A and 4B, the end 23 b of the rotating shaft 23 is formed to have a diameter smaller than that of a portion indicated by 23 c on the end 23 a side of the rotating shaft 23. The diameter of the end 23 b is formed with a dimensional accuracy having a predetermined clearance that can be inserted into the rotating shaft insertion hole 14 of the cooling fan 10. Specifically, the diameter of the end portion 23 b is substantially smaller than the inner diameter of the rotary shaft insertion hole 14, but is slightly smaller. An engaging recess 26 and a key groove 27 are formed at the end 23b. The engagement concave portion 26 is formed in a shape recessed in a spherical shape on the outer peripheral side of the end portion 23 b, that is, a shape engageable with the engagement convex portion 17 of the cooling fan 10. The engagement concave portion 26 constitutes an axial movement restricting portion together with the engagement convex portion 17 of the cooling fan 10.

  Further, the key groove 27 is formed on the outer peripheral side of the end portion 23b so as to be recessed in a rectangular shape with an axial sectional shape, that is, a shape into which the key 19 of the cooling fan 10 can be inserted. The wall portions 27a on both sides in the circumferential direction of the key groove 27 are formed in a planar shape rising inward in the radial direction. The key groove 27 constitutes a rotation restricting portion together with the key 19 of the cooling fan 10.

Next, the operation of the cooling fan 10 and the rotating electrical machine 21 having such a configuration will be described.
The cooling fan 10 is attached to the rotating shaft 23 from the end 23b side, as shown in FIG. 5A shows a state in which the rotating shaft 23 is provided in the rotating electrical machine 21, that is, a state at the time when the casing component assembly process of the rotating electrical machine 21 is completed. In other words, the cooling fan 10 is attached to the rotating electrical machine 21 after the casing parts of the rotating electrical machine 21 are assembled. In this state, as shown in FIG. 5 (B), when the engagement convex portion 17 rides on the outer peripheral side of the rotating shaft 23 in the middle of insertion, the cooling hole 10 is deformed. In actuality, the hollow hole 16 is deformed when the boss portion 11 is elastically deformed. However, for the sake of simplification of description, it is assumed that the hollow hole 16 is deformed.

  As the cooling fan 10 is inserted into the rotating shaft 23, a part of the boss portion 11, specifically, the portion where the engaging convex portion 17 is formed is pushed up radially outward (upward in the drawing). . At this time, the height of the engaging protrusion 17 protruding from the inner peripheral wall 15 (the amount of protrusion from the inner peripheral wall 15) is absorbed by the deformation amount of the lightening hole 16. In other words, the height of the engaging convex portion 17 is smaller than the deformation amount of the lightening hole 16. That is, although the cooling fan 10 has a smaller diameter at the portion where the inner diameter of the rotating shaft insertion hole 14 is the smallest (the portion where the engaging convex portion 17 is provided), the inner diameter is smaller than the diameter of the rotating shaft 23. The rotation shaft 23 can be inserted into the rotation shaft insertion hole 14 by the deformation of the hole 16. In consideration of the possibility of elastic deformation of the entire boss part 11 or the engaging convex part 17 itself formed of a resin material, the height of the engaging convex part 17 is set to the deformation amount of the lightening hole 16, It is good to make it smaller than the total deformation amount which added the deformation amount of the boss | hub part 11 assumed and the deformation amount of the engagement convex part 17 together.

  In this state, as shown in FIG. 5C, when the cooling fan 10 is inserted to the 23c portion of the rotary shaft 23, the engaging convex portion 17 is released from the elastic deformation of the boss portion 11 and moves inward in the radial direction. Then, it engages with the engaging recess 26 of the rotating shaft 23. This completes the installation of the cooling fan 10. In the state shown in FIG. 5C, the cooling fan 10 is moved relative to the axial direction of the rotary shaft 23 by the engagement of the engagement convex portion 17 and the engagement concave portion 26, more specifically. The relative movement in the axial direction between the boss part 11 and the rotating shaft 23 is restricted.

  When the cooling fan 10 is attached to the rotating shaft 23, the key 19 of the cooling fan 10 is inserted into the key groove 27 of the rotating shaft 23 as shown in FIG. 6. In FIG. 6, illustration of the fins 12, the inclined surface portion 13, and the like is omitted. In this state, the wall portions 19 a on both sides of the key 19 of the cooling fan 10 and the wall portions 27 a on both sides of the key groove 27 of the rotating shaft 23 are in contact with each other. The wall portion 19a and the wall portion 27a are both formed in a planar shape in contact with each other. For this reason, rotation in the circumferential direction is restricted by the mutual wall portions 19a and 27a. That is, the boss portion 11 of the cooling fan 10 is restricted from rotating relative to the rotation shaft 23 in the circumferential direction when the key 19 is inserted into the key groove 27.

  As described above, the cooling fan 10 according to the present embodiment can restrict the relative movement in the axial direction between the rotating shaft 23 and the key 19 by the shaft movement restricting portion having the engaging convex portion 17. It is possible to restrict relative rotation in the circumferential direction between the rotation shaft 23 and the rotation shaft 23.

  The boss portion 11 is formed with a lightening hole 16 that opens to at least one end surface in the axial direction (end surface 11a in the present embodiment), and the engagement convex portion 17 is thinned in the inner peripheral wall portion 15. The hole 16 is provided at the end where the hole 16 is open and on the inner peripheral side of the lightening hole 16. Further, the engaging convex portion 17 is formed at a height that can be attached to the rotating shaft 23. For this reason, when the cooling fan 10 is attached to the rotating shaft 23, when the engaging convex portion 17 rides on the outer peripheral surface of the rotating shaft 23, the boss portion 11 is elastically deformed at the portion where the lightening hole 16 is provided. To do. That is, the lightening hole 16 functions as an elastic deformation mechanism that increases the amount of elastic deformation in the boss portion 11 when the cooling fan 10 is attached. Therefore, the cooling fan 10 can be attached to the rotating shaft 23 even if the engaging convex portion 17 protrudes radially inward from the inner peripheral wall portion 15 of the boss portion 11.

  Further, the engagement convex portion 17 is formed such that the length in the circumferential direction on the inner peripheral wall portion 15 side is shorter than the length in the circumferential direction of the corresponding cutout hole 16. In other words, the entire length of the engagement protrusion 17 in the circumferential direction is within the region where the lightening hole 16 can be deformed. Therefore, when the rotating shaft 23 is inserted, the entire engaging projection 17 moves in the radial direction, and the cooling fan 10 can be easily attached. And unlike the conventional structure, the mounting of the cooling fan 10 does not require a fixing member or thermal energy for thermally expanding the cooling fan 10. For this reason, it is possible to reduce the number of work steps and the number of parts when the cooling fan 10 is attached and to reduce the energy consumption. Further, since the attaching operation is substantially merely inserting the rotating shaft 23 into the rotating shaft insertion hole 14 of the cooling fan 10, automation can be achieved.

  Moreover, the end face 11a side of the boss | hub part 11 is opened, and the lightening hole 16 is tapered toward the end surface 11b, and the end face 11b side is not opened. And in this embodiment, the engagement convex part 17 is provided in the inner peripheral wall part 15 in the side by which the lightening hole 16 is opening. For this reason, when the cooling fan 10 is attached, the deformation amount of deformation increases due to the opening of the lightening holes 16 on the end surface 11a side (engagement convex portion 17 side) of the boss portion 11, while the end face 11b side As it goes, the amount of deformation is reduced. Therefore, the cooling fan 10 can be easily attached on the end surface 11a side, and the clearance with the rotary shaft 23 does not become larger than necessary on the end surface 11b side.

  By the way, it is assumed that the cooling fan 10 attached to the rotating electrical machine 21 receives heat from the rotating shaft 23 during the operation of the rotating electrical machine 21. In that case, the cooling fan 10 may thermally expand during operation of the rotating electrical machine 21. Therefore, the height of the engaging convex portion 17 is such that the height of the engaging convex portion 17 is not disengaged from the engaging concave portion 26 due to thermal expansion, that is, smaller than the expansion amount in the boss portion 11. Thereby, even if it is a case where it thermally expands at the time of the driving | running | working of the rotary electric machine 21, engagement with the engagement convex part 17 of the cooling fan 10 and the engagement recessed part 26 of the rotating shaft 23 is cancelled | released. Therefore, the possibility that the cooling fan 10 may come off during operation of the rotating electrical machine 21 can be reduced. The amount of expansion in the boss portion 11 may be set as appropriate according to the shape and material of the cooling fan 10. In this case, the shape of the cooling fan 10 refers to the diameter and inner diameter of the boss portion 11 (diameter of the rotary shaft insertion hole 14), the width of the end face in the axial direction of the boss portion 11 (difference between the diameter and the inner diameter), and the lightening hole. The size in the radial direction and the circumferential direction of the 16 openings can be considered.

  Now, the cooling fan 10 attached to the rotating electrical machine 21 in the state shown in FIG. 3 (B) has a rotating shaft, for example, when performing maintenance such as replacement of a bearing member or discarding the rotating electrical machine 21. 23 must be removed. On the other hand, the cooling fan 10 itself made of a resin material is less likely to be replaced or discarded as long as it is not damaged, and is often reusable. Therefore, it is desirable that the cooling fan 10 be easily detached from the rotating shaft 23.

  Therefore, the cooling fan 10 of the present embodiment is configured to be removable from the rotating shaft 23 and easily. As shown in FIG. 7A, the cooling fan 10 is inserted into a jig insertion hole 18 with a jig 28 (for example, the tip of a minus driver) in a state where it is attached to the rotary shaft 23, and the arrow A Apply force to the outer circumference as shown. As a result, as described above, since the lightening hole 16 is deformed, the engagement between the engagement convex portion 17 and the engagement concave portion 26 is released. Subsequently, the cooling fan 10 is pulled out from the rotating shaft 23 as shown in FIG. 7B in a state in which the engagement between the engagement convex portion 17 and the engagement concave portion 26 is released. Thereby, the cooling fan 10 is removed from the rotating shaft 23. The jig 28 may use a dedicated tool instead of a minus driver. In that case, the jig insertion hole 18 may be formed in such a size (depth or opening size) that the jig 28 can be inserted and can be pulled up by the jig 28.

  Thus, according to the cooling fan 10 of this embodiment and the rotating electrical machine 21 to which the cooling fan 10 is attached, the jig 28 is inserted into the jig insertion hole 18 by providing the jig insertion hole 18. Then, the cooling fan 10 can be removed by applying a force in the outer peripheral direction. Further, when the cooling fan 10 is removed, there is no need for removal of the fixing member or thermal energy for thermally expanding the cooling fan 10 as in the prior art. Therefore, the cooling fan 10 can be easily detached from the rotating shaft 23. Moreover, since the removal is possible by the deformation | transformation of the lightening hole 16, reuse of the removed cooling fan 10 is also easy. Furthermore, since the cooling fan 10 can be easily attached as described above, it is possible to facilitate reattachment to the rotating electrical machine 21 for which maintenance has been completed, or reuse to other rotating electrical machines 21.

  Moreover, since the lightening hole 16 is formed in a tapered shape toward the end surface 11b of the boss portion 11 as described above, when the engagement convex portion 17 is pulled up by the jig 28, the end portion on the end surface 11b side is formed. It is greatly deformed on the opening side in a state where the (tapered tip portion) is a fulcrum. That is, it is not necessary to deform the entire axial direction of the boss portion 11 when removing the cooling fan 10. Therefore, the force applied by the jig 28 can be reduced, and the risk of damaging the boss portion 11 due to an excessive force applied during removal can be reduced.

(Second Embodiment)
Hereinafter, the cooling fan and the rotating electrical machine according to the second embodiment will be described with reference to FIGS. 8 and 9. In the second embodiment, the number of engaging convex portions and the configuration of the engaging concave portion of the rotor are different from those of the first embodiment. The main configuration of the rotating electrical machine is the same as that of the first embodiment, and will be described with reference to FIG.
As shown in FIG. 8, the cooling fan 10 of the second embodiment is provided with a plurality of (for example, two) engaging protrusions 17 on the inner peripheral side of the boss portion 11. These engagement convex portions 17 are provided on the inner peripheral side of the lightening hole 16 as in the first embodiment. A jig insertion hole 18 is provided between the engagement protrusions 17 on the inner peripheral side of the lightening hole 16.

On the other hand, as shown in FIG. 9, the rotating shaft 23 of the rotating electrical machine 21 is provided with a groove-like engaging recess 30 in a portion excluding the key groove 27 in the entire circumferential direction of the rotating shaft 23. In addition, the groove-shaped engaging recess 30 is not only a shape in which the depression is configured by a combination of planes as shown in FIG. It may be a shape.
According to such a configuration, in the cooling fan 10, the plurality of engaging projections 17 are engaged with the engaging recesses 30, respectively. In other words, the number of parts that restrict axial movement increases. Therefore, it is possible to more reliably restrict the cooling fan 10 from moving in the axial direction.
Further, the engagement recess 30 provided in the entire circumferential direction of the rotary shaft 23 can be easily formed by a lathe or the like. Therefore, the work man-hours and work time for providing the engaging recess 30 in the rotating shaft 23 are reduced, and the manufacturing cost can be reduced.

(Third embodiment)
Hereinafter, the cooling fan and the rotating electrical machine according to the third embodiment will be described with reference to FIGS. 10 to 12. In the third embodiment, the shapes of the engaging convex portion and the engaging concave portion are different from those of the first embodiment. The main configuration of the rotating electrical machine is the same as that of the first embodiment, and will be described with reference to FIG.
FIG. 10 is an enlarged view of a cross section of the cooling fan 10 of the third embodiment. The engaging convex portion 40 provided on the cooling fan 10 has an end portion 40a (on the left side in the case of FIG. 10) opposite to the side where the rotating shaft 23 (see FIG. 11) is inserted in the axial direction of the boss portion 11. Is formed in a planar shape perpendicular to the axial direction.

  Further, as shown in FIG. 11, the engaging recess 41 provided in the rotating shaft 23 is a plane in which an end 41a on the side where the lightening hole 16 is open (left side in the drawing) is perpendicular to the axial direction. It is formed into a shape. In other words, the engaging convex portion 40 and the engaging concave portion 41 are formed in a planar shape at a portion that abuts when the cooling fan 10 moves in a direction away from the rotation shaft 23 (leftward in the drawing). Note that the term “vertical” as used herein includes a state inclined in a range that can be regarded as being substantially vertical.

  As shown in FIG. 10, the engaging convex portion 40 has a height H <b> 1 (a protruding amount from the inner peripheral wall portion 15) smaller than the deformation amount of the lightening hole 16, and the rotating electrical machine 21. The height is such that the engagement is not released due to thermal expansion during operation. For this reason, in a state where the cooling fan 10 is attached to the rotating shaft 23, the end 40a of the engaging convex portion 40 and the end 41a of the engaging concave portion 41 abut substantially perpendicularly, and the rotating electrical machine 21 is in operation. In this case, the mutual engagement is not released. Thereby, the movement of the cooling fan 10 to the left in the drawing in the axial direction, that is, the movement of the cooling fan 10 in the direction away from the rotating shaft 23 can be more reliably regulated.

  Moreover, as shown in FIG. 12, you may provide the engagement convex part 42 in which a part by the side of the inner peripheral wall part 15 side of a convex part was formed in planar shape. Specifically, a planar first end portion 42a is formed on the end portion of the engaging convex portion 42 opposite to the side where the rotation shaft 23 is inserted (in the case of FIG. 12, the left end portion in the drawing). You may provide the 2nd end part 42b which inclines from the innermost peripheral end of this 1st one end part 42a to the most projecting position of the engagement convex part 42 (or was formed in the curved surface). The first end portion 42a has a height H2 (amount of protrusion from the inner peripheral wall portion 15) larger than the amount of thermal expansion expected during operation of the rotating electrical machine 21, and the height of the opening of the lightening hole 16 is high. It is formed smaller than the height (the maximum value of the deformation amount due to the hollow hole 16 itself). The rotary shaft 23 has a shape corresponding to the engaging convex portion 42, that is, a planar portion corresponding to the first end portion 42a and an inclined portion corresponding to the second end portion 42b (or a curved surface shape). ) Is formed in a shape having a portion.

As a result, it is possible to reduce the possibility of disengagement between the engagement convex portion 42 and the engagement concave portion 43 due to thermal expansion during operation, and when a force is applied to the outside in the radial direction by the jig 28. Since the second end portion 42b is inclined, the cooling fan 10 can be easily moved in the removal direction (left side in the figure).
As in the second embodiment, a plurality of engaging convex portions 40 and engaging convex portions 42 are provided, or engaging concave portions 41 and engaging concave portions 43 are provided in the entire region in the circumferential direction of the rotary shaft 23. Of course, they may be combined.

(Fourth embodiment)
Hereinafter, a cooling fan and a rotating electrical machine according to the fourth embodiment will be described with reference to FIGS. 13 to 16. The fourth embodiment is different from the first embodiment in that the engagement convex portion is provided on the key. The main configuration of the rotating electrical machine is the same as that of the first embodiment, and will be described with reference to FIG.
As shown in FIG. 13A, the cooling fan 10 of the fourth embodiment includes a key 50 that is formed to protrude radially inward from the inner peripheral wall portion 15 of the boss portion 11. On the outer peripheral side of the key 50, a lightening hole 16 opened on the end surface 11 b side of the boss portion 11 is formed. The hollow holes 16 are open at the recesses 15 a formed at the inner peripheral wall 15 at both ends in the circumferential direction. Further, the key 50 is connected to the inner peripheral wall portion 15 on the end surface 11b side of the boss portion 11 as shown in FIG. That is, the key 50 is movable toward the outside in the radial direction (downward in the drawing) by the deformation of the lightening hole 16. A jig insertion hole 18 is formed between the key 50 and the opening of the lightening hole 16.

  An engagement convex portion 51 is provided on the inner peripheral end surface (the upper surface in the drawing) of the key 50. As shown in FIG. 13B, the engagement convex portion 51 is formed such that the axial length is smaller than the axial length of the lightening hole 16. For this reason, the entire engaging convex portion 51 is movable outward in the radial direction as the key 50 moves outward in the radial direction. Further, as shown in FIG. 13A, the engagement convex portion 51 has a circumferential length that is substantially the same as the circumferential length of the key 50. The key 50 including the engagement convex portion 51 can be moved outward in the radial direction by inserting the jig 28 into the jig insertion hole 18 as in the first embodiment. ing. The engaging projection 51 is formed such that its height (projection amount from the key 50) is smaller than the deformation amount of the lightening hole 16, and is engaged by thermal expansion during operation of the rotating electrical machine 21. It is formed at a height that is not released.

  On the other hand, as shown in FIGS. 14A and 14B, the rotating shaft 23 of the rotating electrical machine 21 includes a key groove 52 and an engaging recess recessed further inward in the radial direction from the inner peripheral side of the key groove 52. 53 is formed. The key 50 is inserted into the key groove 52, and the engagement recess 53 engages with the engagement protrusion 51.

  The cooling fan 10 is attached to the rotating electrical machine 21 as in FIG. Specifically, as shown in FIG. 15A, when the cooling fan 10 is inserted to a position where the engaging convex portion 51 contacts the rotating shaft 23, the lightening hole 16 starts to deform. As a result, the entire key 50 moves radially outward (in the direction of arrow B). And if the cooling fan 10 is further inserted as shown in FIG.15 (B), the engagement convex part 51 and the engagement recessed part 53 will engage. Thereby, the movement in the axial direction between the cooling fan 10 and the rotating shaft 23 is restricted, and the movement in the circumferential direction is also restricted.

Thus, even when the engagement convex portion 51 is provided on the key 50, the cooling fan 10 can be easily attached to the rotating shaft 23. Further, the cooling fan 10 can be easily removed by inserting the jig 28 into the jig insertion hole 18 and moving the engagement convex portion 51 to the outside in the radial direction.
Further, since the circumferential length of the engaging convex portion 51 is formed to be substantially the same as the circumferential length of the key 50, the area where the engaging convex portion 51 and the engaging concave portion 53 abut is large. Thereby, it can control more reliably that the boss | hub part 11 moves to an axial direction. In this case, similarly to the second embodiment, a portion where the engaging convex portion 51 and the engaging concave portion 53 abut or a part thereof may be formed in a planar shape.

  Further, as shown in FIG. 16, the engagement convex portion 51 and the engagement concave portion 53 may be provided on the back side (the end portion on the right side in the drawing) of the key 50. In this case, the hollow hole 16 is provided on the outer peripheral side of the engaging convex portion 51 (opened on the end surface 11a side of the boss portion 11), and the jig insertion hole 18 is gradually widened toward the opening side, For example, it is good to form so that one surface (surface below illustration) may incline. Accordingly, the jig 28 is inserted from the obliquely lower side in the figure, and the jig 28 is rotated inward in the radial direction with the jig insertion hole 18 as a fulcrum, thereby being provided on the back side of the key 50. The engaging convex portion 51 can be moved radially outward (downward in the drawing) by deformation of the lightening hole 16. Thereby, engagement with the engagement convex part 51 and the engagement recessed part 53 is cancelled | released, and the cooling fan 10 can be removed.

(Other embodiments)
In the first embodiment and the like, an example in which the key 19 is provided in the cooling fan 10 has been shown. However, as shown in FIG. 17, a key insertion groove 61 (corresponding to a rotation restricting portion) is provided in the boss portion 11 of the cooling fan 60. A key 62 (corresponding to a rotation restricting portion) formed separately from the cooling fan 60 and the rotating shaft 23 may be inserted. Even with such a configuration, relative rotation in the circumferential direction between the boss portion 11 of the cooling fan 60 and the rotating shaft 23 can be restricted, and the cooling fan 60 can be easily attached and detached. be able to. In this case, since the key insertion groove 61 is provided on the inner peripheral side of the connection position 12a of the fin 12, it is possible to suppress the boss portion 11 from being deformed to the outer peripheral side when the key 62 is inserted or press-fitted.

Although an example in which so-called mixed flow fans are employed as the cooling fans 10 and 60 and an axial flow fan is configured with the fan case 24 has been shown, the fans themselves may be configured with axial flow fans. That is, the cooling fans 10 and 60 may be configured to have fins that extend in the radial direction of the boss portion 11.
In the second embodiment, an example in which the groove-like engagement recess 30 is provided in the region excluding the key groove 27 in the entire circumferential direction of the rotating shaft 23 is shown. However, the groove is recessed in a spherical shape similar to the first embodiment. A plurality of engaging recesses 26 may be provided corresponding to the engaging protrusions 17.

  As described above, according to the cooling fan of the rotating electrical machine of the embodiment, the boss portion having the inner peripheral wall portion forming the rotation shaft insertion hole, the plurality of fins connected to the outer peripheral surface of the boss portion, and the boss portion An axial movement restricting portion that has an engaging convex portion that protrudes radially inward from the inner peripheral wall portion of the boss portion and restricts movement of the boss portion in the axial direction, and extends in the axial direction on the inner peripheral wall portion of the boss portion. And a rotation restricting portion having a key for restricting rotation of the boss portion in the circumferential direction, the boss portion having an opening extending in at least one end face in the axial direction and extending in the axial direction inside the boss portion. A hollow hole that can be deformed in the direction is formed, and the engaging projection is provided on the inner peripheral side of the hollow hole.

  As a result, the cooling fan is restricted from relative movement in the axial direction with respect to the rotation shaft by the engaging convex portion, and relative rotation in the circumferential direction with respect to the rotation shaft is restricted by the key. Is done. And the engaging convex part is located in the inner peripheral wall part of a boss | hub part, and is located in the inner peripheral side of a lightening hole. Moreover, the engaging convex part is formed in the height which can be attached to a rotating shaft. For this reason, when attaching a cooling fan to a rotating shaft, if an engagement convex part rides on the outer peripheral surface of a rotating shaft, and deform | transforms to the outer side of radial direction, the deformation amount will be absorbed by deformation | transformation of a hollow hole. Therefore, even if it is a case where the engagement convex part which protruded from the inner peripheral wall part of the boss | hub part is provided, a cooling fan can be easily attached to a rotating shaft.

The same effect can be obtained for a rotating electrical machine provided with a cooling fan having such a configuration.
Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  In the drawings, 10 and 60 are cooling fans, 11 is a boss portion, 12 is a fin, 14 is a rotation shaft insertion hole, 15 is an inner peripheral wall portion, 16 is a lightening hole, and 17, 40, 42 and 51 are engaging convex portions. (Axis movement restricting portion), 18 is a jig insertion hole, 19, 50 and 62 are keys (rotation restricting portion), 21 is a rotating electrical machine, 22 is a housing, 23 is a rotating shaft, 26, 30, 41, 43, Reference numeral 53 denotes an engagement recess (shaft movement restricting portion), 27 and 52 denote key grooves (rotation restricting portions), and 61 denotes a key insertion groove (rotation restricting portion).

Claims (11)

A rotating electrical machine comprising: a stator provided in a housing; and a rotor having a rotation shaft provided on an inner peripheral side of the stator and provided coaxially with the stator. A cooling fan for a rotating electric machine for cooling,
A boss portion having an inner peripheral wall portion that is formed in a cylindrical shape coaxial with the rotation shaft and forms a rotation shaft insertion hole into which the rotation shaft is inserted;
A plurality of fins connected to the outer peripheral surface of the boss portion and extending radially outward from the boss portion;
An engagement convex portion protruding radially inward from the inner peripheral wall portion of the boss portion, and relative to the axial direction between the boss portion and the rotation shaft inserted into the rotation shaft insertion hole. A shaft movement restricting part that restricts the movement,
A key that extends in the axial direction on the inner peripheral wall portion of the boss portion and regulates relative rotation in the circumferential direction between the boss portion and the rotation shaft inserted into the rotation shaft insertion hole. A rotation restricting portion having
The boss portion extends in the circumferential direction on at least one end surface in the axial direction and is formed with a lightening hole extending in the axial direction inside the boss portion.
The cooling fan for a rotating electric machine, wherein the engagement convex portion is provided on an inner peripheral side of the lightening hole.   2. The jig insertion hole is formed between the boss portion and the engagement convex portion on the end surface on the side where the hole is opened. A cooling fan for the described rotating electric machine.   The length of the engagement convex portion in the circumferential direction on the inner peripheral wall portion side is shorter than the length in the circumferential direction of the opening of the corresponding cutout hole. A cooling fan for the described rotating electric machine.   4. The rotating electrical machine according to claim 1, wherein the engagement convex portion is provided at an end of the inner peripheral wall portion on the opening side of the lightening hole. 5. cooling fan.   2. The engagement convex portion is formed such that at least a part of an end portion on the opposite side to the side where the rotation shaft is inserted in the axial direction is formed in a planar shape perpendicular to the axial direction. 5. A cooling fan for a rotating electrical machine according to claim 1. In the boss portion, a plurality of the hollow holes are formed in the circumferential direction,
The cooling fan for a rotating electric machine according to any one of claims 1 to 5, wherein a plurality of the convex portions are provided on the inner peripheral wall portion.   2. The key is a convex portion formed integrally with the boss portion, and projecting radially inward from the inner peripheral wall portion of the boss portion and extending in the axial direction. A cooling fan for a rotating electric machine according to any one of claims 1 to 6.   The cooling fan for a rotating electric machine according to claim 7, wherein the engaging convex portion is provided on an end surface on an inner peripheral side of the key. The boss portion is formed with a key insertion groove formed to be recessed radially outward from the inner peripheral wall portion,
The cooling fan for a rotating electric machine according to any one of claims 1 to 6, wherein the key is formed separately from the boss portion and is inserted into the key insertion groove. A rotating electrical machine to which the cooling fan of the rotating electrical machine according to any one of claims 1 to 9 is attached,
A stator provided in a housing, and a rotor having a rotation shaft provided on the inner peripheral side of the stator and provided coaxially with the stator,
The rotating shaft has an engaging groove portion that extends in the axial direction and engages with the key, and an engaging concave portion that engages with the engaging convex portion at an end portion on the side where the cooling fan is attached. Rotating electric machine characterized by that.   The rotating electrical machine according to claim 10, wherein the engaging recess is formed on the entire circumference in the circumferential direction of the rotating shaft.

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