JP2010114951A - Electric motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve further downsizing, in the case of having fixed a ring to a motor case, by fitting and fixing a plurality of split cores constituting a stator, to the ring, in a motor. <P>SOLUTION: A peripheral ring 20a is fitted and fixed to the periphery of the plurality of split cores 16 which constitute the stator 12, and a peripheral ring 20a is fixed to a motor case 14. The peripheral ring 20a has: a ring body member 42 which is fitted and fixed around the plurality of split cores 16; and a case attaching member 44. The case attaching member 44 has: a flange 45 which has an outer extension 47 that extends outward in its radial direction and couples to a motor case 14; and an axial barrel 48 which is coupled to the radial inside of the flange 45 via a bend 46. For the bend 46, at least its radial end 62 has a peripheral brim 60 on the bend side, which is positioned on the radial inner side than the peripheral face of the ring body member 42. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a motor in which a ring is fitted and fixed to the outer periphery of a plurality of divided cores constituting a stator, and the ring is fixed to a motor case.

  Conventionally, as shown in FIGS. 15 to 16, a motor including a plurality of divided cores, an outer peripheral ring, and a motor case has been considered. FIG. 15 is a cross-sectional view in which a part of a conventionally considered motor is omitted. FIG. 16 is a view in which only the outer ring and the plurality of split cores are taken out from FIG. 15 and viewed from the right to the left in FIG.

  The motor 10 shown in FIGS. 15 to 16 includes a stator 12 and a motor case 14. The stator 12 has a plurality of split cores 16 and a stator winding 18. In a state where the plurality of divided cores 16 are arranged adjacent to each other in an annular shape, the outer peripheral ring 20 is fitted and fixed to the plurality of divided cores 16 by shrink fitting or the like so that the plurality of divided cores 16 are circled. The stator core 22 is configured by connecting in an annular shape. Each divided core 16 has a yoke portion 24 provided on the outer peripheral portion and a teeth portion 26 provided in a radially projecting state on the inner peripheral side of the yoke portion 24. The stator winding 18 is wound around each tooth portion 26 or a plurality of tooth portions 26 by concentrated winding or distributed winding.

  The outer peripheral ring 20 is provided at a plurality of locations in the circumferential direction of a cylindrical ring main body portion 29 that fits the split core 16 and one end portion (right end portion in FIG. 15) of the ring main body portion 29, and extends outward in the radial direction. And a radially extending portion 32 that exits. In the state where the outer peripheral ring 20 is arranged inside the motor case 14, the radial extending portions 32 are brought into contact with the mounting surfaces 28 provided in the periphery of the opening end of the motor case 14, and are formed in the respective radial extending portions 32. The motor case 14 and the outer ring 20 are integrally fixed by screwing the bolt 36 inserted through the through hole 34 into a screw hole formed in the mounting surface 28. The reason why the stator 12 is constituted by the plurality of divided cores 16 instead of the integral core is to reduce the size of the motor 10 and improve the material yield.

  The motor case 14 has a case-side outer extending portion 38 that extends radially outward from the mounting surface 28. The case side outer extending portion 38 can be screwed to a transmission case (not shown) with a bolt (not shown). The motor 10 includes a rotor shaft (not shown) and a rotor (not shown) fixed to the rotor shaft. The rotor is opposed to the radially inner side of the stator 12 and the rotor shaft is rotatably supported by the motor case 14. .

  For example, a permanent magnet type motor 10 is configured by arranging permanent magnets at a plurality of locations in the circumferential direction and combining the rotor and the stator 12. Further, the outer peripheral ring 20 is integrally formed with a ring main body 29 and a flange 30 by drawing or the like. The motor 10 is not limited to a permanent magnet type motor, and may be another motor such as a synchronous motor. Thus, when the stator 12 is constituted by a plurality of divided cores 16, it has been conventionally considered to assemble the stator 12 to the motor case 14 via the outer ring 20. Moreover, the case side outer side extension part 38 can also be fixed to another members other than a transmission case.

  Further, Patent Document 1 describes a housing that forms a housing of an electric motor and that is connected and fixed between an internal combustion engine and a transmission. The internal space of the housing is formed in a shape that can accommodate a stator holder and an annular stator group, and the stator holder includes a cylindrical portion and a flange portion provided so as to project radially outward at one axial end side thereof. It is supposed to be equipped with. The stator holder is fixed to the housing by screwing a bolt inserted into a through hole provided in the flange portion into a bolt hole of the housing. The annular stator group is configured by arranging a predetermined number of stator pieces in an annular shape and is attached to the stator holder.

JP 2005-312151 A

  In the case of the conventional motor 10 shown in FIGS. 15 to 16, the outer peripheral ring 20 is formed by integrally forming the ring body 29 and the plurality of radially extending portions 32 by drawing or the like. Yes. For this reason, the structure of the outer peripheral ring 20 is simplified, but the outer ring 20 is curved at the connecting portion between the ring main body part 29 and the radial extension part 32 as the radial extension part 32 is formed in the outer ring 20. A bent R portion 40 (FIG. 15) is formed. In this case, the length from the central axis O (FIG. 15) of the radially outer ends of the plurality of radially extending portions 32 provided in the portion avoiding the bending R portion 40 is increased, and each radially extending portion is extended. The diameter D1 of the pitch circle diameter (hereinafter referred to as “PCD”), which is the diameter of a virtual circle including the centers of the plurality of through holes 34 formed in the portion 32, may also increase. As a result, there is a possibility that the outer diameter D2 of the motor case 14 including the screw holes for connecting the bolts 36 inserted into the through holes 34 in a ball-like manner also increases. On the other hand, although it is conceivable to make the bending R portion 40 extremely small, there is a limit to reducing the bending R portion 40 when the outer peripheral ring 20 is formed by inexpensive processing such as drawing. In the case where such a bent R portion 40 is formed, the diameter D1 becomes large if no effort is made, so there is room for improvement in terms of further miniaturization of the motor 10 as a whole. It is desirable to further reduce the size of the motor 10 because it is easy to reduce the weight and cost, and to improve the mountability of the motor 10 to a mounted object such as a vehicle on which the motor 10 is mounted.

  The configuration described in Patent Document 1 also includes a housing corresponding to the motor case, a stator holder corresponding to the outer ring, and an annular stator group corresponding to a plurality of divided cores. The stator holder includes a tube portion and a flange portion provided integrally with the tube portion. For this reason, a bending R part is easy to be formed in the continuous part of a cylinder part and a flange part. For this reason, in the case where no contrivance is made, as in the case of the configuration shown in FIGS. 15 to 16, the P.S. defined by the through-hole formed in the flange portion. C. D. Becomes larger and causes the entire motor to become larger.

  An object of the present invention is to further reduce the size of a motor when a plurality of divided cores constituting a stator are fitted and fixed to a ring and the ring is fixed to a motor case.

  A motor according to the present invention is a motor in which a ring is fitted and fixed to the outer periphery of a plurality of divided cores constituting a stator, and the ring is fixed to a motor case. A ring body portion that is fitted and fixed, a radially extending portion that extends radially outward and is coupled to the motor case, and an axial direction that is coupled to a radially inner side of the radially extending portion via a bent portion The bent portion is a motor characterized in that at least the radially inner end has a bent portion side outer peripheral edge located radially inward of the outer peripheral surface of the ring main body portion.

  According to the above motor, in the configuration in which the plurality of split cores constituting the stator are fitted and fixed to the ring, and the ring is fixed to the motor case, it is connected to the radially inner side of the radially extending portion via the bent portion. The bent portion has an outer peripheral edge on the bent portion side, at least the radially inner end of the bent portion is located radially inward of the outer peripheral surface of the ring main body portion. For this reason, even when a curved bent part is formed by making a member having a bent part using an inexpensive process such as drawing, the radial direction of the radially extending part provided on the radially outer side of the bent part The length of the outer end from the central axis can be reduced, and the length from the central axis of the coupling portion with the motor case at the radially extending portion can be reduced, thereby further miniaturizing the motor.

  In the motor according to the present invention, preferably, the radially extending portion, the bent portion, and the cylindrical portion are provided in a case attachment member that is different from the ring main body member having the ring main body portion. It is press-fitted inside the end of the main body.

  According to the motor described above, a structure capable of reducing the size of the motor can be realized by a combination of members having simple shapes, and complicated processing work when manufacturing the motor can be eliminated or reduced.

  Further, in the motor according to the present invention, preferably, the motor case is provided on one end side in the axial direction, and is provided with a mounting surface for connecting the radially extending portion, and provided on the other end side in the axial direction. A positioning portion that performs positioning in the circumferential direction.

  According to the motor described above, the outer ring can be supported on the motor case by the both-side support structure on both sides in the axial direction, and a plurality of divided cores can be more stably coupled and fixed to the motor case. .

  In the motor according to the present invention, preferably, the motor case has an opening provided at one end in the axial direction and a closing plate provided at the other end in the axial direction, and on the opening side of the motor case. The motor case and the ring are coupled, and the ring is positioned in the circumferential direction with respect to the motor case on the closing plate portion side of the motor case.

  In the motor according to the present invention, preferably, the radially extending portion, the bent portion, and the cylindrical portion are provided on a second case mounting member different from the ring main body member having the ring main body portion, and the ring main body member Is provided on one end side of the ring main body, and has a small-diameter cylindrical portion whose outer diameter is smaller than the outer diameter of the ring main-body portion, and the small-diameter cylindrical portion is press-fitted inside the second case attachment member.

  In the motor according to the present invention, preferably, the ring main body portion, the radially extending portion, the bent portion, and the cylindrical portion are provided in a single ring member with a mounting portion, and the cylindrical portion is the ring main body portion. The outer diameter is smaller than the outer diameter.

  According to the motor of the present invention, when the plurality of divided cores constituting the stator are fitted and fixed to the ring, and the ring is fixed to the motor case, further downsizing can be achieved.

[First Embodiment]
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 to 7 show a first embodiment of the present invention. FIG. 1 is a cross-sectional view in which a part of the motor according to the present embodiment is omitted. FIG. 2 is a view in which only the ring main body member and the plurality of divided cores are taken out from FIG. 1 and viewed in the axial direction of FIG. 3 is a view of only the case attachment member taken out from FIG. 1 and viewed from the right to the left in FIG. FIG. 4 is a cross-sectional view showing a state in which the stator is fitted inside the ring body member. FIG. 5 is a cross-sectional view showing a state in which the stator fitted and fixed to the ring main body member is inserted inside the motor case. FIG. 6 is a cross-sectional view showing a state in which the case mounting member is coupled to the motor case with a bolt in the state shown in FIG. FIG. 7 is an enlarged cross-sectional view showing only the case mounting member taken out from FIG. In this embodiment, since the basic structure of the motor case and the stator is the same as the conventional structure shown in FIGS. 15 to 16, the following is shown in FIGS. The same parts as those in the structure are denoted by the same reference numerals, and redundant description is omitted or simplified.

  As shown in FIG. 1, the motor 10 a according to the present embodiment has the outer ring 20 a fitted and fixed to the outer periphery of the plurality of split cores 16 constituting the stator 12, and the outer ring 20 a is fixed to the motor case 14. Yes. In particular, the outer peripheral ring 20a is formed in an annular shape with a substantially L-shaped cross section as shown in FIGS. 1 and 3 and a ring body member 42 having only a cylindrical ring body as shown in FIGS. The case mounting member 44 is composed of two members 42 and 44. The ring body member 42 and the case attachment member 44 are made of metal such as a steel plate. The case attachment member 44 is a substantially disc-shaped flange portion 45 that is a radially extending portion that extends radially outward, and a bent portion 46 that has a curved shape on the radially inner side of the flange portion 45. And an axial tube portion 48 to be connected. In addition, outer extending portions 47 that extend radially outward are provided at a plurality of circumferential locations (three locations in the illustrated example) on the outer peripheral surface of the disc-shaped flange main body 49 that constitutes the flange portion 45. . A through hole 34 for inserting the bolt 36 is formed in each outer extension 47, and as shown in FIG. 3, at least two outer extensions 47 of the plurality of outer extensions 47 A knock hole 50 for inserting a rod-shaped knock pin (not shown) for positioning in the direction is formed.

  As shown in FIG. 1, the motor case 14 has a substantially bottomed cylindrical shape made of aluminum or the like, and has an opening 52 provided at one axial end (the right end in FIG. 1) and the other axial end (see FIG. 1). 1 and a closing plate portion 54 provided at the left end portion. A case seat surface 56, which is an annular step surface, is provided near the inner back end of the motor case 14. Further, the mounting surface 28 located on a virtual plane orthogonal to the axial direction is provided in the periphery of the opening 52 of the motor case 14, and axial screw holes are formed at a plurality of circumferential positions of the mounting surface 28. Yes. Further, the motor case 14 is provided with case-side outer extending portions 38 extending radially outward from the mounting surface 28 over the entire circumference or at a plurality of locations in the circumferential direction. A case side through hole 58 is formed in the portion 38 in the axial direction. The outer side surface (the right side surface in FIG. 1) of the case side outer extension 38 is brought into contact with another member such as a transmission case (not shown) or a bottomed cylindrical motor cover, and is inserted into the case side through hole 58. It is used to connect another member and the motor case 14 with the bolts not shown.

  The outer peripheral ring 20 a is configured by press-fitting a cylindrical portion 48 of the case mounting member 44 inside one end portion (right end portion in FIG. 1) of the ring main body member 42. That is, in order to couple and fix the outer peripheral ring 20a to which the stator 12 is fixed to the motor case 14, the motor 10a is manufactured by the following manufacturing method. First, as shown in FIG. 4, as a first step, the stator winding 18 is wound around the teeth portion 26 provided on the inner peripheral side of the plurality of split cores 16 adjacent to each other in an annular shape, thereby configuring the stator 12. In this state, the plurality of split cores 16 are assembled inside the ring body member 42, that is, fitted and fixed.

  Next, as shown in FIG. 5, as a second step, the ring body member 42 to which the plurality of split cores 16 are fixed is inserted inward from the opening end side of the motor case 14, and the other end surface ( The left end surface in FIG. 5 is abutted in the axial direction against a case seat surface 56 provided near the inner back end of the motor case 14. In this case, a radial gap is formed at least in part in the axial direction between the inner peripheral surface of the motor case 14 and the outer peripheral surface of the ring body member 42.

  Next, as shown in FIG. 6, as a third step, the cylindrical portion 48 of the case mounting member 44 is gradually press-fitted inside one end portion of the ring main body member 42, and the flange portion 45 provided on the case mounting member 44. The inner surface of this is abutted against the mounting surface 28 of the motor case 14. In this case, the plurality of screw holes provided at a plurality of locations in the circumferential direction of the mounting surface and the plurality of through holes 34 provided in the outer extending portion 47 are aligned. Further, by inserting rod-shaped knock pins fixed to the mounting surface 28 of the motor case 14 so as to protrude in the axial direction into the knock holes 50 (FIG. 3) provided in the at least two outer extending portions 47, the motor The case mounting member 44 can be positioned in the circumferential direction with respect to the case 14. In this state, the outer extension 47 is fixedly coupled to the mounting surface 28 by screwing the bolts 36 inserted into the plurality of through holes 34 into the plurality of screw holes. As a result, the case attachment member 44 is coupled and fixed to the motor case 14, and the case attachment member 44 and the ring body member 42 constitute the outer peripheral ring 20 a.

  Further, the motor case 14 is configured by rotatably supporting a rotor shaft with a rotor fixed to the motor case 14 and making the rotor face the stator 12. In the state in which the motor 10 a is configured in this way, the outer extending portion 47 of the case mounting member 44 extends radially outward from the ring body member 42 and is coupled and fixed to the motor case 14. Further, as shown in FIG. 1, the bent portion 46 provided on the case mounting member 44 has a bent portion side outer peripheral edge 60 in which at least the radially inner end is located radially inside the outer peripheral surface of the ring body member 42. Have That is, as shown in FIG. 7, the bent portion side outer peripheral edge 60, which is the outer peripheral edge of the curved bent portion 46, which is a connecting portion between the cylindrical portion 48 and the flange portion 45 of the case mounting member 44, is in the radial direction. The inner end 62 is located at a continuous portion with one end in the axial direction of the cylindrical outer peripheral surface of the cylindrical portion 48, and the diameter of the inner side surface (left side surface in FIG. 7) where the radial outer end 64 is a flat surface of the flange portion 45. It is located in a continuous part with the inner end in the direction. And the radial direction inner end 62 of the bending part side outer periphery 60 is located inside radial direction rather than the outer peripheral surface of the ring main body member 42 (FIG. 1 etc.).

  According to such a motor 10 a, the plurality of split cores 16 constituting the stator 12 are fitted and fixed to the outer ring 20 a and the outer ring 20 a is fixed to the motor case 14. And an axial tube portion 48 connected via the bent portion 46, and the bent portion 46 has at least a radially inner end 62 positioned radially inward of the outer peripheral surface of the ring body member 42. It has an outer peripheral edge 60. For this reason, even when the curved bent portion 46 is formed by making the case mounting member 44 having the bent portion 46 by using an inexpensive process such as drawing, a flange portion provided on the radially outer side of the bent portion 46. The length of the radially outer end of 45 from the central axis O (FIG. 1) can be reduced, and a virtual circle including a plurality of bolts 36 and screw holes, which are the joints with the motor case 14 in the flange 45. Diameter, P.I. C. D. The diameter D1a can be made smaller than the diameter D1 in the case of the conventional structure shown in FIGS. That is, in the flange portion 45, the length from the central axis O of the joint portion with the motor case 14 can be reduced. Accordingly, the outer diameter D2a of the motor case 14 having the case-side outer extending portion 38 on the outer diameter side of the screw hole for coupling the bolt 36 is also considered from the conventional art shown in FIGS. The diameter can be smaller than the diameter D2 in the case of the structure, and the motor 10a can be further downsized.

  The flange portion 45, the bent portion 46, and the cylindrical portion 48 are provided on a case attachment member 44 that is different from the ring main body member 42 having a cylindrical ring main body portion. It is press-fitted inside the end. For this reason, the structure which can achieve size reduction of the motor 10a can be implement | achieved by the combination of the member which has a simple shape, and the complicated process operation at the time of manufacturing the motor 10a can be eliminated or reduced.

[Second Embodiment]
FIG. 8A is a cross-sectional view in which a part of the motor according to the second embodiment of the present invention is omitted, and FIG. It is the figure seen from the right side of (a) to the left. 9A is a view showing only the ring main body member taken out from FIG. 8B, and FIG. 9B is a cross-sectional view taken along the line AA in FIG. 9A. 10A is a view showing only the case mounting member taken out from FIG. 8B, and FIG. 10B is a sectional view taken along the line BB in FIG. 10A. FIG. 11 is a cross-sectional view taken along the line CC of FIG. 8A, showing only the motor case.

  As shown in FIGS. 8A, 8B and 9A, 9B, in the motor 10b of the present embodiment, the other axial end of the cylindrical ring body member 42a constituting the outer ring 20b. (Left end portion in FIGS. 8A and 9B) A second outer extension 66 that protrudes to the outer diameter side at two or more locations (two locations in the illustrated example) in the circumferential direction of the outer peripheral surface. Is provided. Further, an axial knock hole 70 for inserting the knock pin 68 is formed in each second outer extending portion 66. A case mounting member 44 is press-fitted into the end of the ring main body member 42a.

  As shown in FIGS. 10A and 10B, the case attaching member 44 is provided with outer extending portions 47 at a plurality of locations in the circumferential direction of the flange portion 45. However, unlike the case of the first embodiment shown in FIG. 3 described above, each outer extending portion 47 is not provided with a knock hole 50 (see FIG. 3) for inserting a knock pin.

  As shown in FIGS. 8A and 8B, the motor case 14 has an opening 52 provided at one end in the axial direction and a closing plate portion 54 provided at the other end in the axial direction. A mounting surface 28 for connecting the outer extension 47 is provided around the opening 52 at one end in the direction. Therefore, the outer peripheral ring 20 b is coupled to the motor case 14 on the opening 52 side of the motor case 14.

  On the other hand, as shown in FIGS. 8A and 11, in the motor case 14, the inner circumferential surface of the opening 52 is recessed radially outward at two or more positions (two places in the illustrated example) in the circumferential direction. An axial recess 72 is provided. One end in the axial direction of the recessed hole 72 is opened to the attachment surface 28. The other axial end of the recessed hole 72 reaches the same position in the axial direction as the case seating surface 56 that is a stepped surface provided near the back end of the motor case 14. A rod-shaped knock pin 68 is fixed in a state of protruding in the axial direction from the back end face of each concave hole 72. The knock pin 68 inserted through a part of the ring main body member 42a corresponds to a positioning portion that positions the outer peripheral ring 20b in the circumferential direction with respect to the motor case 14.

  As shown in FIG. 8A, when the ring main body member 42 a is inserted inside the motor case 14, the second outer extending portions 66 of the ring main body member 42 a are connected to the concave holes 72 of the motor case 14. The ring main body member 42a is inserted into the motor case 14 while being fitted to each other, and the side surface of each second outer extending portion 66 is abutted against the inner end surface of each concave hole 72 to form each second outer extending portion 66. A knock pin 68 fixed to the motor case 14 is inserted into the knock hole 70. With this configuration, rotation of the ring body member 42a with respect to the motor case 14 is prevented. That is, the outer peripheral ring 20 b is positioned with respect to the motor case 14 on the closing plate portion 54 side of the motor case 14. In this state, the cylindrical portion 48 of the case mounting member 44 is press-fitted inside the end portion of the ring main body member 42a.

  According to the present embodiment, the motor case 14 is provided on one end side in the axial direction, and is provided on the mounting surface 28 for coupling the outer extending portion 47 and the other end side in the axial direction. 14 and a knock pin 68 inserted through the ring main body member 42a for positioning the outer peripheral ring 20b in the circumferential direction. For this reason, the outer peripheral ring 20b can be supported with respect to the motor case 14 by a both-end support structure on both sides in the axial direction, and the plurality of split cores 16 can be more stably coupled and fixed to the motor case 14. . Since other configurations and operations are the same as those in the first embodiment, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

[Third Embodiment]
FIG. 12 is a cross-sectional view in which a part of the motor according to the third embodiment of the present invention is omitted. FIG. 13 is an enlarged cross-sectional view of a portion D in FIG.

  As shown in FIGS. 12 and 13, in the motor 10c of the present embodiment, the outer peripheral ring 20c includes a ring main body member 42b and a second case attachment member 74 that is a separate member from the ring main body member 42b. The ring main body member 42 b includes a cylindrical ring main body portion 76 and a small-diameter cylindrical portion 78 that is provided on one axial end side of the ring main body portion 76 and has an outer diameter smaller than the outer diameter of the ring main body portion 76. They are connected by a conical connecting portion 80. In a state where the plurality of split cores 16 are fitted and fixed inside the ring main body portion 76 constituting the outer peripheral ring 20c, the connecting portion 80 and the small-diameter cylindrical portion 78 are from the outer end surface of the split core 16 (the right end surface in FIG. 12). Is also provided outside in the axial direction.

  The second case mounting member 74 has a substantially disc-like shape extending outward in the radial direction, similar to the case mounting member 44 constituting the motor 10 of the first embodiment shown in FIGS. It has a flange portion 45a and an axial tube portion 48a connected to the inside of the flange portion 45a in the radial direction via a bent portion 46a having a curved shape. In addition, outer extending portions 47 that extend radially outward are provided at a plurality of locations in the circumferential direction of the outer peripheral surface of the flange main body 49 constituting the flange portion 45a. Further, the inner diameter of the cylindrical portion 48a is slightly larger than the inner diameter of the cylindrical portion 48 (see FIG. 1) constituting the case mounting member 44 (see FIG. 1) of the first embodiment.

  As shown in FIG. 13, when the outer peripheral ring 20c is configured, the small-diameter cylindrical portion 78 provided on the ring main body member 42b is press-fitted inside the cylindrical portion 48a provided on the second case mounting member 74, and the ring main body The member 42b and the second case mounting member 74 are coupled and fixed. In this state, the radially inner end 62a of the bent portion side outer peripheral edge 60a, which is the outer peripheral edge of the bent portion 46a provided in the second case mounting member 74, is positioned radially inward from the outer peripheral surface of the ring main body portion 76. . In other words, the bent portion 46 a has the bent portion side outer peripheral edge 60 a in which the radially inner end 62 a is positioned radially inward from the outer peripheral surface of the ring main body portion 76. That is, the diameter d1 of the radially inner end 62a is smaller than the outer diameter d2 of the ring body 76.

  In the case of the motor 10c of this embodiment as well, the plurality of split cores 16 constituting the stator 12 are fitted and fixed to the outer ring 20c and the outer ring is fixed to the motor case 14 as in the above embodiments. Even when the bent portion 46a is formed on the second case mounting member 74 constituting the outer peripheral ring 20c in the configuration for fixing the outer ring 20c, the radially outer end of the flange portion 45a provided on the radially outer side of the bent portion 46a. Of the through hole 34 formed in the flange portion 45a and the length from the central axis O. C. D. The diameter D1b can be reduced, and the outer diameter D2b of the motor case 14 can also be reduced, so that the motor 10c can be further reduced in size. Since other configurations and operations are the same as those of the first embodiment shown in FIGS. 1 to 7 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

[Fourth Embodiment]
FIG. 14 is a cross-sectional view showing one axial end portion of the ring member with attachment portion in the motor according to the fourth embodiment of the present invention. As shown in FIG. 14, in the present embodiment, the ring body member 42 (see FIG. 1 and the like) and the case mounting member 44 (see FIG. 1 and the like) are the same as those in the first embodiment shown in FIGS. Instead of the reference, a ring member 82 with a mounting portion, which is a single member, is used. The ring member 82 with a mounting portion has a configuration in which the ring main body member 42 and the case mounting member 44 are integrally coupled, and has a cylindrical ring main body portion 84 and a radial direction extending radially outward. A flange portion 86 which is an extension portion, a small diameter cylindrical portion 88 provided on the inner diameter side of the flange portion 86, a curved bent portion 90 connecting the small diameter cylindrical portion 88 and the flange portion 86, a small diameter cylindrical portion 88 and a ring A connecting portion 92 that connects the main body portion 84 is integrally provided. Outer extending portions 47 extending outward in the radial direction are provided at a plurality of locations in the circumferential direction of the disc-shaped flange main body 93 constituting the flange portion 86.

  The small diameter cylindrical portion 88 has an outer diameter smaller than the outer diameter of the ring main body portion 84. Therefore, the radially inner end 96 of the bent portion side outer periphery 94, which is the outer periphery of the bent portion 90, is positioned radially inward from the outer peripheral surface of the ring main body portion 84. That is, the diameter d1a of the radially inner end 96 is smaller than the outer diameter d2a of the ring main body 84.

  When such a ring member 82 with a mounting portion is fixed to the motor case 14, one side (left side in FIG. 14) edge of the ring body 84 of the ring member 82 with a mounting portion is attached to the motor case 14 (see FIG. 1, etc.). Installed in the motor case 14 so as not to abut against the case seating surface 56 (see FIG. 1 etc.), which is a stepped surface near the far end, and to leave a gap between the case seating surface 56 The parted ring member 82 is inserted. In this state, the inner side surface (the left side surface in FIG. 14) of the flange portion 86 including the outer extending portion 47 of the ring member 82 with the mounting portion is pushed to the mounting surface 28 (see FIG. 1 and the like) of the motor case 14. The bolt member 36 (see FIG. 1 and the like) inserted through the through hole 34 of the outer extending portion 47 is screwed to the screw hole formed in the mounting surface 28 to fix the ring member 82 with mounting portion to the motor case 14. To do.

  Also in the case of the motor of this embodiment, a plurality of split cores 16 (see FIG. 1 and the like) constituting the stator 12 (see FIG. 1 and the like) are attached to a ring with a mounting portion as in the above embodiments. In the configuration in which the ring member with attachment portion 82 is fixed to the motor case 14 by being fitted and fixed to the member 82, even when the bent portion 90 is formed on the ring member with attachment portion 82, the bending portion 90 is radially outside. The length from the central axis of the radially outer end of the flange portion 86 provided in the flange portion 86 and the P.P. C. D. The outer diameter of the motor case 14 can also be reduced, and the motor can be further reduced in size. Since other configurations and operations are the same as those of the first embodiment shown in FIGS. 1 to 7 described above, the same parts are denoted by the same reference numerals, and overlapping illustrations and descriptions are omitted.

  In each of the above embodiments, the case where the radially extending portion is a flange portion having a plurality of outer extending portions has been described, but the present invention is not limited to such a configuration. For example, a plurality of field-extended portions that are directly extending in the radial direction can be connected to the plurality of field-bent portions without using a disc-shaped flange body. In each of the above embodiments, a through hole for inserting a bolt may be formed in the disc-shaped flange body.

It is sectional drawing which abbreviate | omitted one part in the motor of the 1st Embodiment of this invention. It is the figure which took out only the ring main body member and the some split core from FIG. 1, and was seen to the axial direction of FIG. It is the figure which took out only the case attachment member from FIG. 1, and was seen from the right side of FIG. It is sectional drawing which shows the state which fits a stator inside a ring main body member. It is sectional drawing which shows the state which inserts the stator fixed by fitting to the ring main body member inside a motor case. In the state shown in FIG. 5, it is sectional drawing which shows the state which couple | bonds a case attachment member to a motor case with a volt | bolt. It is an expanded sectional view which takes out and shows only a case attachment member from FIG. (A) is sectional drawing which abbreviate | omitted one part in the motor of the 2nd Embodiment of this invention, (b) took out only an outer periphery ring and several division | segmentation cores from FIG. 1, (a) It is the figure seen from the right to the left. (A) is a figure which takes out and shows only a ring main-body member from FIG.8 (b), (b) is AA sectional drawing of (a). (A) is a figure which takes out and shows only a case attachment member from FIG.8 (b), (b) is BB sectional drawing of (a). It is CC sectional drawing of Fig.8 (a) which takes out and shows only a motor case. It is sectional drawing which abbreviate | omitted one part in the motor of the 3rd Embodiment of this invention. It is a D section expanded sectional view of Drawing 12, showing a part omitted. It is sectional drawing which shows the axial direction one end part of the ring member with a mounting part in the motor of the 4th Embodiment of this invention. It is sectional drawing which abbreviate | omitted one part in the motor considered conventionally. FIG. 16 is a view in which only the outer ring and the plurality of split cores are taken out from FIG. 15 and viewed from the right to the left in FIG. 15.

Explanation of symbols

  10, 10a, 10b, 10c Motor, 12 stator, 14 motor case, 16 split core, 18 stator winding, 20, 20a, 20b, 20c outer ring, 22 stator core, 24 yoke part, 26 teeth part, 28 mounting surface, 29 Ring body part, 32 Radial extension part, 34 Through hole, 36 bolt, 38 Case side outer extension part, 40 Bending R part, 42, 42a, 42b Ring body member, 44 Case mounting member, 45, 45a Flange Part, 46, 46a bent part, 47 outer extension part, 48, 48a cylinder part, 49 flange body, 50 knock hole, 52 opening part, 54 closing plate part, 56 case seat surface, 58 case side through hole, 60, 60a Bend side outer periphery, 62, 62a Radial inner end, 64 Radial outer end, 66 Second outer extension, 68 Knock pin , 70 Knock hole, 72 Recessed hole, 74 Second case mounting member, 76 Ring main body part, 78 Small diameter cylindrical part, 80 Connecting part, 82 Ring member with mounting part, 84 Ring main body part, 86 Flange part, 88 Small diameter cylindrical part , 90 bent portion, 92 connecting portion, 93 flange body, 94 bent portion side outer peripheral edge, 96 radial inner end.

Claims (6)

A ring is fitted and fixed to the outer periphery of a plurality of split cores constituting the stator, and the ring is fixed to the motor case,
Ring
A ring body portion fitted and fixed to the outside of the plurality of split cores;
A radially extending portion extending radially outward and coupled to the motor case;
An axial tube connected via a bent portion on the radially inner side of the radially extending portion, and
The motor is characterized in that at least the radially inner end of the bent part has an outer peripheral edge on the bent part side positioned radially inward from the outer peripheral surface of the ring main body part. The motor according to claim 1,
The radially extending portion, the bent portion, and the cylindrical portion are provided in a case mounting member different from the ring main body member having the ring main body portion,
The cylinder part is press-fitted inside the end part of the ring main body part. The motor according to claim 1,
The motor case
A mounting surface provided on one end side in the axial direction and connecting the radially extending portion;
And a positioning portion that is provided on the other end side in the axial direction and that positions the ring in the circumferential direction with respect to the motor case. The motor according to claim 3, wherein
The motor case has an opening provided at one end in the axial direction and a closing plate provided at the other end in the axial direction, and the motor case and the ring are coupled on the opening side of the motor case. A motor characterized in that a ring is positioned in a circumferential direction with respect to a motor case on a closing plate portion side. The motor according to claim 1,
The radially extending portion, the bent portion, and the tubular portion are provided in a second case mounting member that is different from the ring body member having the ring body portion,
The ring main body member is provided on one end side of the ring main body portion, and has a small-diameter cylindrical portion whose outer diameter is smaller than the outer diameter of the ring main body portion,
The small diameter cylindrical portion is press-fitted inside the second case mounting member. The motor according to claim 1,
The ring main body part, the radially extending part, the bent part and the cylindrical part are provided in a single ring member with a mounting part,
The cylinder portion has an outer diameter smaller than the outer diameter of the ring main body portion.

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