JP2010226790A - Stator core support structure and vehicle-driving device including the structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost stator core support structure, wherein degradation in the performance of a rotating machine can be prevented, by setting a small air gap between a rotor and a stator, even though the axial length of the stator is large, and to prevent deficiency in the strength of and degradation in the axial force of a bolt fastened portion, without fail, and to provide a vehicle-driving device. <P>SOLUTION: The stator core support structure is such that a stator core 23 is fastened to and supported in a case 10. The structure includes an external cylinder member 41, including external cylinder portion 42 housing the stator core 23 and multiple pairs of fastening plate portions 43, 44 provided integrally on the outer circumferential side of the external cylinder portion 42 so that they are separated from and face one another in the direction of the axis thereof; multiple pillar members 45, fitted in between the fastening plate portions 43, 44 in one and the other sets; and multiple fastening bolts 14, that penetrate one fastening plate portion 43 and pillar member 45 and the other fastening plate portion 44, in the direction of the axis of the external cylinder member 41 and is coupled with the case 10 and integrally fastens the external cylinder member 41 and the multiple pillar members 45 to the case 10. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a stator core support structure and a vehicle drive apparatus having the structure, and more particularly to a stator core support structure suitable for a hybrid vehicle and a vehicle drive apparatus having the structure.

  Conventionally, a stator core that forms the main part of a stator of a rotating machine (an electric motor, a generator motor, or a generator) is composed of a plurality of divided cores adjacent to each other in the rotation direction, and the stator core component processing, coil assembly work, etc. It is known that the technology can be facilitated, and for example, such a technique is employed in a vehicle drive device of a hybrid vehicle in which a rotating machine such as an internal combustion engine and a generator motor (motor generator) is provided.

  As this type of vehicle drive device, for example, as shown in FIG. 7, the stator core 101 is housed and fixed (press-fit, shrink-fitted, etc.) in an outer cylinder 102 formed into a substantially cylindrical shape by pressing. A flange 102f on one end side of the outer cylinder 102 is fastened to the case 103 with a bolt 104, so that the stator 106, in which the coil 105 is mounted on the stator core 101, is cantilevered and supported on the case 103 together with the outer cylinder 102. Known (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 11-78556 JP 2006-273186 A

  However, in the conventional stator core support structure and the vehicle drive device having the structure as described above, since the stator is cantilevered by the case, when the stator becomes longer in the axial direction, for example, traveling on a wavy road There has been a problem that there is a concern about insufficient strength of the bolt fastening portion of the outer cylinder in a mode in which the stator of the generator motor is vibrated as in a collision.

  In addition, the rotor that is supported on both ends of the case via bearings is likely to be inclined or offset from the axis of the stator, and it is necessary to set a large air gap between the rotor and the stator. There was a problem that the performance was lowered.

  In addition, since the length of the bolt that fastens the flange on one side of the outer cylinder that supports the stator to the case is shortened, the axial force of the bolt tends to decrease due to vibration, impact, fatigue, etc., ensuring a stable fastening force In order to achieve this, it is necessary to increase the number of fastening bolts, leading to an increase in parts cost and assembly cost.

  The present invention has been made in order to solve the above-described conventional problems. Even if the axial length of the stator is large, the air gap between the rotor and the stator is set small to reduce the performance of the rotating machine. An object of the present invention is to provide a low-cost support structure for a stator core and a vehicle drive device having such a structure that can prevent the bolt fastening portion from being insufficient in strength and reliably prevent a reduction in axial force. To do.

  In order to achieve the above object, the stator core support structure according to the present invention is (1) a stator core support structure in which a stator core that surrounds a rotor of a rotating machine is fastened to a support and supported. An outer cylindrical portion that supports and accommodates the stator core, and an outer cylindrical portion that is provided on the outer peripheral side of the outer cylindrical portion so as to face each other while being spaced apart in the axial direction. A cylindrical member, a plurality of support members fitted between the plurality of sets of one and other fastening plate portions, and the one fastening plate portion, the support member and the other fastening plate portion, respectively, the outer cylindrical member. And a plurality of fastening members that are coupled to the support body through the axial direction and integrally fasten the outer cylinder member and the plurality of support members to the support body.

  With this configuration, a plurality of strong support columns in which a plurality of pairs of fastening plate portions and a plurality of support members are integrated around the outer cylinder member are configured, and the support columns are integrated with the support, The outer cylinder members are supported at both ends by these columns. Therefore, even if the stator becomes longer in the axial direction or is subjected to vibration, it is possible to prevent a large bending moment from acting on the outer cylinder member as in the case of cantilever support, and to ensure sufficient strength of the fastening portion. Is done. And the fastening operation | work of a fastening member can be completed from one side, and workability | operativity is also good. Further, the inclination and deviation of the axis of the stator are less likely to occur, and the air gap between the rotor and the stator can be set small, so that the performance of the rotating machine can be improved. Furthermore, since the fastening member has a length that penetrates the column member and the fastening plate portions on both sides thereof, it is possible to secure a stable fastening force by suppressing a decrease in fastening force due to vibration, impact, fatigue, etc., and to reduce the number of fastening members. High cost can be prevented by suppressing.

  In the stator core support structure described in (1) above, preferably, (2) the stator core is configured by a plurality of divided cores adjacent to each other in the rotation direction of the rotor.

  With this configuration, a plurality of support pillars that are substantially integrated on the support side only by providing a plurality of pairs of fastening plate portions on the outer cylinder member that holds the outer peripheral portions of the plurality of split cores in an annular shape. The member can be supported at both ends.

  In the stator core support structure according to the above (1) and (2), it is preferable that (3) the plurality of pairs of fastening plate portions be spaced apart at equal intervals in the circumferential direction of the outer cylinder member.

  With this configuration, the fastening force by the fastening member can be generated at equal intervals in the circumferential direction of the outer cylinder member, and the outer cylinder member can be supported uniformly. It is desirable to provide three or more pairs of fastening plate portions so that each pair of opposing fastening plate portions is spaced apart from both other fastening plate portions in both the horizontal direction and the vertical direction.

  In the stator core support structure according to the above (1) to (3), (4) the plurality of pairs of fastening plate portions are provided at both ends of the outer cylinder member, and are provided at each end of the outer cylinder member. It is preferable that a flange for connecting at least a pair of adjacent fastening plate portions to each other is formed.

  With this configuration, the strength of the outer cylinder member is increased, and the plurality of support members substantially integrated on the support side are connected to each other by the flange, and the strength is further increased.

  Preferably, in the stator core support structure according to (4) above, (5) the plurality of fastening members are each composed of a plurality of fastening bolts that are screw-coupled to the support, and the outer cylinder member It is preferable that the one fastening plate portion and the other fastening plate portion at both ends have through holes through which the fastening bolts can be passed, respectively.

  With this configuration, multiple fastening bolts have a length that penetrates the fastening plate portions on both sides in the axial direction, and the bolt's axial force is unlikely to decrease due to vibration, impact, fatigue, etc., so a stable fastening force can be secured. The number of fastening bolts can be suppressed.

  In the stator core support structure according to the above (5), (6) the intermediate through hole through which the column member can pass the fastening bolt between the one fastening plate portion and the other fastening plate portion. It is preferable to have.

  With this configuration, the strut member can be accurately arranged around the fastening bolt, and the fastening force from the fastening member can be accurately transmitted.

  In the stator core support structure according to (6) above, (7) the support member has at least two intermediate through holes among the plurality of intermediate through holes, and at least two of the plurality of bolts. These bolts are preferably passed through in parallel.

  With this configuration, it is possible to provide a high-strength strut member that is difficult to buckle even if the radial dimension is reduced, and to easily provide the strut member with other functions such as cooling of the outer cylinder member.

  In the stator core support structure described in (7) above, (8) the support member constitutes a cooling means for cooling the rotating machine.

  With this configuration, the stator is cooled, and the efficiency of the rotating machine is increased.

  In the stator core support structure described in (8) above, (9) the column member forms a cooling passage through which a medium for cooling the rotating machine passes in the vicinity of the outer peripheral portion of the outer cylinder member. Is preferred.

  With this configuration, the stator is cooled, and the efficiency of the rotating machine is increased. As the cooling medium, for example, oil used for lubrication and cooling in the case can be used.

  In the stator core support structure described in (8) above, it is preferable that (10) the support member has a heat conduction coefficient equal to or greater than that of the outer cylinder member.

  With this configuration, heat conduction from the distal end side to the proximal end side, that is, the support body side of the outer cylinder member can be promoted, and the cooling effect can be enhanced.

  On the other hand, a vehicle drive device according to the present invention is (11) a vehicle drive device having the stator core support structure according to any one of (1) to (10), in order to achieve the above object. A case as the support body in which a stator core of a rotating machine is fastened by the plurality of fastening members, an input shaft and an output shaft that are rotatably supported by the case, respectively, and interposed between the input shaft and the output shaft And a driving force transmission mechanism.

  With this configuration, a plurality of strong support columns in which a plurality of pairs of fastening plate portions and a plurality of support members are integrated are formed around the outer cylindrical member, and the support columns are integrated into the case. The outer cylinder member is supported on both ends of the column. Therefore, even if the stator becomes longer in the axial direction or is subjected to vibration, it is possible to prevent a large bending moment from acting on the outer cylinder member as in the case of cantilever support, and to ensure sufficient strength of the fastening portion. Is done. And the fastening operation | work of a fastening member can be completed from one side, and workability | operativity is also good. Further, the inclination and deviation of the axis of the stator are less likely to occur, and the air gap between the rotor and the stator can be set small, so that the performance of the rotating machine can be improved. Furthermore, since the fastening member has a length that penetrates the column member and the fastening plate portions on both sides thereof, it is possible to secure a stable fastening force by suppressing a decrease in fastening force due to vibration, impact, fatigue, etc., and to reduce the number of fastening members. By suppressing it, the high cost of a vehicle drive device can be prevented.

  In the vehicle drive device described in (11) above, (12) the rotating machine is preferably a generator motor.

  With this configuration, a vehicle drive device suitable for a hybrid vehicle is obtained.

  According to the present invention, even when the stator is elongated in the axial direction, the strength of the fastening portion can be sufficiently ensured compared to the case of cantilever support, and the fastening work of the fastening member can be completed from one side. It is possible to improve the performance of the rotating machine by preventing the tilt and deviation of the stator axis from occurring, and fastening by suppressing the decrease in fastening force due to vibration, impact, fatigue, etc. of the fastening member It is possible to provide a low-cost stator core support structure capable of suppressing the number of members and a vehicle drive device having the structure.

It is the principal part sectional drawing which shows the support structure of the stator core which concerns on 1st Embodiment of this invention. It is II-II arrow sectional drawing of FIG. It is a perspective view of the stator of the vehicle drive device which has the support structure of the stator core which concerns on 1st Embodiment of this invention. It is a combined sectional view showing the important section composition of the vehicle drive device concerning a 1st embodiment of the present invention. It is the principal part sectional drawing which shows the support structure of the stator core which concerns on 2nd Embodiment of this invention, and is a figure corresponding to FIG. 2 which shows 1st Embodiment. It is a side surface expanded view of the support | pillar member in the support structure of the stator core which concerns on 2nd Embodiment of this invention. It is the principal part sectional drawing which shows the support structure of the stator core of a prior art example.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 4 are views showing a stator core support structure and a vehicle drive apparatus having the structure according to the first embodiment of the present invention.

  First, the configuration will be described.

  The stator core support structure of the present embodiment includes two stators mounted on a stator of a rotating machine as shown in FIGS. 1 to 3, for example, a front-side transaxle 1 for a hybrid vehicle as shown in a combined section in FIG. 4. It is used for generator motors 2 and 3 (rotating machines).

  As shown in FIG. 4, the transaxle 1 includes an input shaft 7 fastened to an internal combustion engine (hereinafter simply referred to as an engine) (not shown), and left and right drive shafts 9a and 9b for driving left and right drive wheels (not shown). And is integrated with the engine to form a vehicle drive device.

  Further, the transaxle 1 is a differential capable of differential output to the planetary gear mechanism 4 (planetary gear device) that constitutes a speed change mechanism in the case 10 that constitutes a part of the transmission case, and the left and right drive shafts 9a and 9b. A generator motor 2 and 3 are mounted as motor-type drive means for housing the mechanism 5 and driving an input element (described later) of the planetary gear mechanism 4, and the generator motor 2 is disposed on one side of the case 10. The generator motor 3 is arranged on the other side of the case 10 so as to be able to generate power by the power from the engine. The schematic configuration of such a transaxle 1 is the same as that of a known one.

  Further, a cover 11 is liquid-tightly attached to one side of the case 10 (left side in the figure), and is finally fastened and supported on the other side of the case 10 to the engine block side. The housing 12 is fastened. The housing 12 is partitioned by a cover 13 into a housing portion for the other generator motor 3 and a housing portion for a damper element 16 that is a driving force transmission mechanism from the engine. The case 10, the covers 11 and 13, and the housing 12 constitute a transmission case.

  The generator motors 2 and 3 include stators 21 and 31 and rotors 22 and 32, and stator cores 23 and 33 constituting the main parts of the stators 21 and 31 are respectively fastened to the case 10 of the transaxle 1. The bolts 14 and 15 are fastened and supported.

  As shown in FIGS. 1 and 4, the stators 21, 31 are obtained by winding stator coils 24, 34 around substantially annular stator cores 23, 33 each formed by laminating a plurality of electromagnetic steel plates (not indicated). As shown in FIGS. 2 and 3, the stator cores 23 and 33 are constituted by a plurality of divided cores 23P and 33P adjacent to each other in the rotational direction of the rotors 22 and 32, respectively. Each of the plurality of split cores 23P and 33P has a substantially T-shaped cross section having yoke portions 23a and 33a that form a circular yoke as a whole and teeth portions 23b and 33b around which the stator coils 24 and 34 are wound. ing.

  The rotors 22 and 32 are obtained by mounting permanent magnets 22b and 32b at equal circumferential intervals (equal angular intervals) on rotor main bodies 22a and 32a formed by laminating a plurality of electromagnetic steel plates.

  The configurations of the stators 21 and 31 and the rotors 22 and 32 themselves are the same as known ones and will not be described in detail here.

  The stator core support structure according to the present embodiment is applied to a portion in which the stator cores 23 and 33 are fastened and supported to the case 10 of the transaxle 1 by a plurality of fastening bolts 14 and 15.

  First, the support structure of the stator core 23 of one generator motor 2 to the case 10 will be described, and after that, the support structure of the stator core 33 of the other generator motor 3 to the case 10 will be described.

  As shown in FIGS. 1 to 3, the stator core 23 that forms the main part of the stator 21 of the one generator motor 2 is supported by the outer cylinder member 41 at the outer peripheral portion formed of the yoke portions 23 a of the plurality of divided cores 23 </ b> P. At the same time, it is housed inside the outer cylinder member 41.

  The outer cylinder member 41 is a metal part formed into a substantially cylindrical shape by press working, and the outer cylinder member 42 and the outer cylinder part 42 are arranged so as to face each other while being separated from each other on both axial sides of the outer cylinder part 42. A plurality of sets of one and the other fastening plate portions 43 and 44 (a plurality of pairs of fastening plate portions) provided integrally on the outer peripheral side of the cylindrical portion 42 at equal intervals in the circumferential direction are configured.

  A plurality of cylindrical strut members 45 are fitted between the one and the other fastening plate portions 43 and 44, and the one and the other fastening plate portions 43 and 44 and the strut member 45 have the same diameter. Through holes 43a, 44a and intermediate through holes 45a (hereinafter, both are also referred to as bolt through holes 43a, 44a, 45a). In addition, a plurality of fastening bolts 14 pass through the plurality of sets of bolt through holes 43a, 44a, 45a.

  Each of the plurality of fastening bolts 14 penetrates the one fastening plate portion 43, the column member 45, and the other fastening plate portion 44 in the axial direction of the outer cylinder member 41 and is integrally coupled to the case 10. That is, the plurality of fastening bolts 14 are a plurality of fastening members that integrally fasten the outer cylinder member 41 and the plurality of support members 45 to the case 10.

  The one and the other fastening plate portions 43 and 44 that form a plurality of pairs are formed by bending both ends of the outer cylinder member 41 radially outward, and at least adjacent to each end of the outer cylinder member 41. A pair of fittings, for example, a total number (four in the figure, but three may be sufficient) of fastening plate portions 43 or flanges 41f and 41g for connecting the fastening plate portions 44 to each other are formed.

  More specifically, each of the plurality of fastening bolts 14 includes a male screw portion 14m within a certain range from the tip, a bolt head portion 14n that is tightened (or fastened) by a fastening tool, and a male screw portion. 14m and a shaft portion 14s positioned between the bolt head portion 14n. When the male screw portion 14m is screwed into the female screw hole portion 10h of the case 10, the bolt head portion 14n is fastened to the one and the other fastening plate portions 43 and 44 and the column member 45 via the washer 17 by the bolt head portion 14n. As the force is applied, an axial tensile force corresponding to the fastening force is generated in the shaft portion 14s, and the outer cylinder member 41 and the plurality of support members 45 can be integrally fastened to the case 10. . The male screw portion 14m of the fastening bolt 14 may have a slightly larger diameter than the shaft portion 14s, but preferably has the same diameter.

  The through holes 43a and 44a of the one and the other fastening plate portions 43 and 44 are slightly larger in diameter than the male screw portion 14m and the shaft portion 14s of the fastening bolt 14 and have the same shape that allows the fastening bolt 14 to pass therethrough. It is a circular hole, and the intermediate through hole 45a of the column member 45 is a long circular cross-sectional hole having the same diameter as the through holes 43a and 44a.

  The support member 45 is made of, for example, a material having a strength higher than that of the die-cast alloy forming the case 10 and has a sufficient strength that does not buckle against an axial load caused by fastening of the fastening bolt 14. Therefore, the column member 45 is made of a material having high rigidity similar to that of the fastening bolt 14 when the cross-sectional area is relatively small, but if the cross-sectional area is large and difficult to buckle, die casting alloy, aluminum, etc. May be formed. Further, the support member 45 is not limited to a cylinder, and is a cylindrical body having an arbitrary cross-sectional shape through which the fastening bolt 14 can pass, or a non-cylindrical body such as a U-shaped, M-shaped, or U-shaped cross section. May be.

  Before each fastening member 45 is fastened by the fastening bolt 14, it is fitted between the corresponding one fastening plate portion 43 and the other fastening plate portion 44 in a strong fitting state, and is outside in a state of being clamped in the axial direction. It is held by the cylinder member 41. Each support member 45 may be further fixed to the outer cylinder portion 42 of the outer cylinder member 41.

  Further, the through holes 43a and 44a of the one fastening plate portion 43 and the other fastening plate portion 44 and the intermediate through hole 45a of the column member 45 are the largest diameters of the male screw portion 14m and the shaft portion 14s of the fastening bolt 14, respectively. The diameter is slightly larger than that of the portion. Further, the gap between the shaft portion 14s of the fastening bolt 14 and the column member 45 in the intermediate through hole 45a of the column member 45 is small, and the eccentric amount of the column member 45 with respect to the shaft portion 14s of the fastening bolt 14 is within a certain range. It is like that.

  As shown in FIGS. 1 to 4, in the other generator motor 3, as in the case of one generator motor 2, the stator core 33 that forms the main part of the stator 31 is composed of yoke portions 33 a of a plurality of divided cores 33 </ b> P. The outer peripheral portion is supported by the outer cylinder member 61 and housed inside the outer cylinder member 61. Here, the number of support members 45 and 65 and the number of fastening bolts 14 and 15 are both four, and the structure for supporting the generator motors 2 and 3 to the case 10 is shown in parentheses in FIGS. However, the number of support members 45 and 65 and fastening bolts 14 and 15 need not be four. Needless to say, the shapes of the outer cylinder members 41 and 61 differ depending on the diameter of the stator and the length in the axial direction.

  The outer cylinder member 61 is a metal part formed into a substantially cylindrical shape by press working, and the outer cylinder member 62 and the outer cylinder member 62 are arranged so as to face each other while being separated from each other in the axial direction of the outer cylinder portion 62. A plurality of sets of one and the other fastening plate portions 63 and 64 (a plurality of pairs of fastening plate portions) provided integrally on the outer peripheral side of the cylindrical portion 62 and at equal intervals in the circumferential direction are configured.

  A plurality of cylindrical strut members 65 are fitted between the one and other fastening plate portions 63 and 64, and the one and the other fastening plate portions 63 and 64 and the strut member 65 have the same diameter. Bolt through holes 63a, 64a and 65a. Further, a plurality of fastening bolts 15 pass through the plurality of sets of bolt through holes 63a, 64a, 65a.

  Since the stator 31 of the other generator motor 3 is more compact than the stator 21 of the one generator motor 2 and the laminated height of the magnetic steel plates is also smaller, the fastening bolt 15 is shorter than the fastening bolt 14 and has a slightly smaller diameter. Yes. However, the fastening bolts 14 and 15 may have the same effective diameter.

  Each of the plurality of fastening bolts 15 penetrates the one fastening plate portion 63, the support member 65, and the other fastening plate portion 64 in the axial direction of the outer cylinder member 61 and is integrally coupled to the case 10. That is, the plurality of fastening bolts 15 are a plurality of fastening members that integrally fasten the outer cylinder member 61 and the plurality of support members 65 to the case 10. Here, the direction of the plurality of fastening bolts 15 is opposite to the direction of the plurality of fastening bolts 14 (rightward in FIG. 4) (leftward in FIG. 4). May be located in the same straight line or in the vicinity thereof, but may be staggered so as to be most separated from each other in the rotor rotation direction.

  In addition, one and the other fastening plate portions 63 and 64 that form a plurality of pairs are formed by bending both end portions of the outer cylinder member 61 radially outward. Flange 61f and 61g which mutually connect fastening plate part 63 or fastening plate part 64 are formed.

  More specifically, each of the plurality of fastening bolts 15 includes a male screw portion 15m within a certain range from the tip, a bolt head portion 15n that is tightened (or tightened and released) by a fastening tool, and a male screw portion. 15m and a shaft portion 15s positioned between the bolt head portion 15n, and when screwed to the female screw hole portion 10j of the case 10 by the male screw portion 15m, the outer cylinder via the washer 18 at the bolt head portion 15n. A fastening force is applied to one and the other fastening plate portions 63 and 64 and the column member 65 of the member 61, and an axial tensile force corresponding to the fastening force is generated in the shaft portion 15s, so that the outer cylinder member 61 and the plurality of members 61 The column member 65 can be integrally fastened to the case 10.

  The one fastening plate portion 63 and the other fastening plate portion 64 have through holes 63a and 64a through which the fastening bolts 15 can pass, respectively, and the column member 65 includes the one fastening plate portion 63 and the other fastening plate portion 63. An intermediate through hole 65a through which the fastening bolt 15 can be passed between the fastening plate portions 64 is provided.

  The column member 65 is made of, for example, a material having a strength equal to or higher than that of the die-cast alloy forming the case 10 and has a sufficient strength that does not buckle against an axial load caused by fastening of the fastening bolt 15. The support member 65 is made of the same material as the support member 45, and is not limited to a cylinder, but may be a cylindrical body having an arbitrary cross-sectional shape or a non-cylindrical body.

  Before each fastening member 65 is fastened by the fastening bolt 15, it is inserted in a strong fitting state between the corresponding one fastening plate portion 63 and the other fastening plate portion 64, and is outside in a state of being clamped in the axial direction. It is held by the cylinder member 61.

  The relationship between the through holes 63a and 64a of the one fastening plate portion 63 and the other fastening plate portion 64 and the intermediate through hole 65a of the column member 65 is such that the one fastening plate portion 43 and the other fastening plate portion 44 are Similar to the relationship between the through holes 43a and 44a and the intermediate through hole 45a of the support member 45, the eccentric amount of the support member 65 with respect to the shaft portion 15s of the fastening bolt 15 is suppressed within a certain range.

  Next, the operation will be described.

  In the stator core support structure of the present embodiment configured as described above and the vehicle drive apparatus having the structure, a plurality of pairs of fastening plate portions 43 and 44 around the outer cylinder member 41 on one generator motor 2 side, and A plurality of strong support pillars P1 in which a plurality of support pillars 45 are integrated are configured, and the support pillars P1 are integrated with the case 10, and the outer cylinder member 41 is supported on both ends by the support pillars P1. Will be.

  Therefore, even if the stator 21 becomes longer in the axial direction or a large vibration is applied to the stator 21 due to traveling on a wavy road of the vehicle, the outer end of the outer cylinder member 41 is closer to the base end side than in the case of conventional cantilever support. A large bending moment is suppressed from acting, and the force acting in the radial direction of the outer cylinder member 41 is reliably supported by the fastening surface portion of the outer cylinder member 41 to the case 10, and Enough strength is secured.

  Further, since the fastening work of the fastening bolt 14 can be completed by the bolt fastening work from one side which is the open side before the covers 11 and 13 are attached to the case 10, the workability is good.

  In addition, since the outer cylinder member 41 is supported at both ends, it is difficult for the axis of the stator core 23 to be inclined or offset, and the air gap between the rotor 22 and the stator 21 can be set small. Performance can be improved.

  Furthermore, since the fastening bolt 14 has a length that penetrates the column member 45 and the fastening plate portions 43 and 44 on both sides thereof, a stable fastening force can be secured by suppressing a decrease in fastening force due to vibration, impact, fatigue, or the like. Can do. Therefore, the number of fastening bolts 14 can be suppressed and the cost can be prevented.

  In the same manner, on the other generator motor 3 side, a plurality of strong support pillars P2 in which a plurality of pairs of fastening plate portions 63 and 64 and a plurality of support pillar members 65 are integrated around the outer cylinder member 61 are configured. Since the support pillars P2 are integrated with the case 10 and the outer cylinder member 61 is supported at both ends by the support pillars P2, both the generator motor 3 side and the generator motor 2 side are also supported. The same action and effect can be obtained.

  As described above, in the present embodiment, a plurality of pairs of fastening plate portions 43 and 44 are provided on the outer cylinder member 41 that holds the outer peripheral portions of the plurality of split cores 23P in an annular shape, and similarly, the outer periphery of the plurality of split cores 33P. The plurality of support members 45, which are substantially integrated with the outer cylinder members 41, 61 on the case 10 side, simply by providing a plurality of pairs of fastening plate portions 63, 64 on the outer cylinder member 61 that holds the annular portion. 65, that is, the pillars P1 and P2 can be supported at both ends.

  The plurality of pairs of fastening plate portions 43 and 44 are spaced apart at equal intervals in the circumferential direction of the outer cylinder member 41, and the plurality of pairs of fastening plate portions 63 and 64 are spaced apart at equal intervals in the circumferential direction of the outer cylinder member 61. Therefore, the fastening force by the fastening bolts 14 and 15 can be generated at equal intervals in the circumferential direction of the outer cylinder members 41 and 61, and the outer cylinder members 41 and 61 can be supported uniformly.

  Further, at least one pair of adjacent fastening plate portions 43 or flanges 41f or 41g for connecting the fastening plate portions 44 to each other are provided at each end portion of the outer cylindrical member 41. Since 61f and 61g are provided, the strength of the outer cylinder members 41 and 61 is increased, and the plurality of support members 45 and 65 that are substantially integrated on the case 10 side are mutually connected by the flanges 41f, 41g, 61f, and 61g. It will be connected and the intensity | strength will increase more.

  Further, the plurality of fastening bolts 14 have a length that penetrates the fastening plate portions 43 and 44 on both sides in the axial direction, and the plurality of fastening bolts 15 have a length that penetrates the fastening plate portions 63 and 64 on both sides in the axial direction. As a result, the axial force of the fastening bolts 14 and 15 is less likely to decrease due to vibration, impact, fatigue, and the like, and a stable fastening force can be secured. Therefore, the number of fastening bolts 14 and 15 can be suppressed, and the cost of the transaxle 1 can be prevented.

  Further, the support members 45 and 65 can be accurately arranged around the fastening bolts 14 and 15, and the fastening force from the fastening bolts 14 and 15 can be accurately transmitted to the support members 45 and 65.

  As described above, in the present embodiment, even when the stator cores 23 and 33 of the stators 21 and 31 are elongated in the axial direction, it is possible to sufficiently ensure the strength of the fastening portion as compared with the case of cantilever support, and the fastening bolt 14 , 15 can be completed from the open side (one side) before the cover is attached, and the workability can be improved. In addition, the axis of the stators 21 and 31 is not easily inclined or offset, so that the rotating machine A low-cost stator core support structure and its structure capable of improving performance and suppressing the number of fastening members by suppressing a decrease in fastening force due to vibration, impact, fatigue, etc. of the fastening bolts 14 and 15 The vehicle drive device which has can be provided.

(Second Embodiment)
FIG. 5 is a view showing a stator core support structure according to a second embodiment of the present invention. In addition, this embodiment has the structure substantially the same as 1st Embodiment except the support | pillar structure around a fastening member, and only the difference part is illustrated. Therefore, about the same component as 1st Embodiment, the difference is demonstrated below, using the code | symbol of the corresponding component shown by FIGS. 1-4.

  In the present embodiment, as shown in FIG. 5, in one generator motor 2, the stator core 23 of the stator 21 is accommodated in the outer cylinder member 41, and a pair of opposing faces are provided so as to surround the outer cylinder member 41. Semi-cylindrical column members 75U and 75L are provided.

  These strut members 75U and 75L constitute one cylindrical body, and four intermediate through holes 75a corresponding to the four intermediate through holes 45a of the first embodiment are arranged at equal intervals in the circumferential direction (in FIG. 5). 90 ° intervals), and each of the intermediate through holes 75a has protrusions 75b having a cross-sectional shape corresponding to the fastening plate portions 43 and 44 (not indicated in FIG. 5) of the outer cylinder member 41. .

  That is, each support member 75U, 75L has two intermediate through holes 75a (at least two intermediate through holes) corresponding to half of the four intermediate through holes 75a. The shaft portions 14s of at least two fastening bolts 14 are passed through the two intermediate through holes 75a in parallel.

  The pair of semi-cylindrical column members 75U and 75L have an outer surface side radius of curvature equal to or greater than the radius of the flanges 41f and 41g of the outer cylinder member 41, and the outer periphery of the outer cylinder portion 42 of the outer cylinder member 41. It has an inner radius of curvature substantially equal to the surface radius and is in contact with the outer cylinder portion 42.

  Also on the other generator motor 3 side, a support member similar to that described above is formed.

  In this way, even if the radial thicknesses of the support members 75U and 75L corresponding to the radial dimensions of the support members 45 of the first embodiment are relatively small, the support members 75U and 75L are resistant to buckling. Can be.

  In the present embodiment, the pair of semi-cylindrical column members 75U and 75L may have a heat conduction coefficient equal to or greater than the heat conduction coefficient of the outer cylinder member 41. Heat conduction from the front end side of the member 41 to the base end side, that is, the case 10 side can be promoted by the support members 75U and 75L, and the cooling effect of the stators 21 and 31 can be enhanced. In other words, the column members 75U and 75L can be provided with other functions such as heat dissipation of the outer cylinder member 41 and the stators 21 and 31.

  Further, a flexible high heat conductive layer made of a material having a high thermal conductivity coefficient that fills the gap between the support members 75U and 75L and the outer tube portion 42 of the outer tube member 41 may be sandwiched. Concavities and convexities and fins (for example, a plurality of rib-like fins parallel to the intermediate through hole 75a) may be provided on the outer peripheral portion so as to promote heat dissipation from the stators 21 and 31 side.

  A cooling passage may be formed between the pair of semi-cylindrical column members 75U and 75L and the outer cylinder portion 42 of the outer cylinder member 41, and a cooling fluid (for example, oil) may be passed therethrough. . That is, it is possible to configure a cooling means for forcibly cooling the generator motors 2 and 3 using the support members 75U and 75L.

(Third embodiment)
FIG. 6 is a view showing a stator core support structure according to a third embodiment of the present invention. In addition, this embodiment has the same configuration as that of the second embodiment except for the internal structure of the support member. Therefore, the difference between the second embodiment and the second embodiment will be described below by using the reference numerals of the corresponding components shown in FIGS. 1 to 5 for the same components as the second embodiment.

  In the present embodiment, as shown in FIG. 6, in one generator motor 2, a pair of semi-cylindrical column members 75 </ b> U and 75 </ b> L are provided so as to surround the outer cylinder member 41. The members 75U and 75L are substantially formed with cooling passages 75pw through which oil (cooling fluid) from an oil pump (not shown) that circulates oil for lubrication and cooling in the transaxle 1 is passed. That is, the support members 75U and 75L cool the generator motor 2 by forming a cooling passage 75pw through which cooling oil as a medium for cooling the stator 21 of the generator motor 2 passes in the vicinity of the outer peripheral portion of the outer cylinder member 41. The cooling means is configured.

  On the other generator motor 3 side, cooling means substantially the same as described above is configured.

  If it does in this way, stators 21 and 31 will be cooled reliably and the efficiency of generator motors 2 and 3 will increase. Further, as the cooling medium, for example, oil used for lubrication and cooling in the case 10 can be used. Therefore, in addition to the support members 75U and 75L, for example, a cooling passage 10pw may be added to the case 10 side, and low. Can be a cost cooling means.

  In each of the above-described embodiments, the fastening member is a bolt inserted from the open side. However, a nut can be screwed to the bolt arranged on the case side from the open side. In addition, a female screw member to which a bolt for fastening one and the other generator motors is screwed can be formed from a material different from that of the case and embedded in the case. Further, although the vehicle drive device is a transaxle for a hybrid vehicle, other vehicle drive devices (for example, a generator motor mounted on the output shaft portion of the engine) may be used. Needless to say, the support structure can be applied to various devices other than the vehicle drive device. It goes without saying that the stator core referred to in the present invention may be a motor (motor) that is a rotating machine other than a generator motor (motor generator) or a stator of a generator (generator).

  As described above, the stator core support structure and the vehicle drive apparatus having the structure according to the present invention ensure sufficient strength of the fastening portion as compared with the case of cantilever support even when the stator becomes longer in the axial direction. The fastening work of the fastening member can be done from one side and the workability can be improved, and the performance of the rotating machine can be improved by making it difficult to cause the inclination and deviation of the stator axis. The present invention has an effect that the number of fastening members can be reduced by suppressing a decrease in fastening force due to vibration, impact, fatigue, etc. of the member, and a stator core support structure and a vehicle drive device having the structure, particularly a hybrid vehicle The present invention is useful for a stator core support structure suitable for the vehicle and a vehicle drive apparatus having the structure.

1 Transaxle (vehicle drive system)
2 One generator motor (rotary machine)
3 The other generator motor (rotary machine)
10 Case 10 pw, 75 pw Cooling passage 14 Fastening bolt 14m Male thread part 14n Bolt head part 14s Shaft part 15 Fastening bolt 15m Male thread part 15n Bolt head part 15s Shaft part 21, 31 Stator 22, 32 Rotor 23, 33 Stator core 23a, 33a Yoke part 23b, 33b Teeth part 23P, 33P Split core 24, 34 Stator coil 41, 61 Outer cylinder member 41f, 41g, 61f, 61g Flange 42, 62 Outer cylinder part 43, 44, 63, 64 Fastening plate part 43a, 44a, 63a , 64a Through hole 45, 65 Prop member 45a, 65a, 75a Intermediate through hole 75U, 75L Prop member P1, P2 Prop

Claims (12)

A stator core support structure in which a stator core surrounding a rotor of a rotating machine is supported by being fastened to a support,
A plurality of pairs of fastening plates that are integrally provided on the outer peripheral side of the outer cylindrical portion so as to support the outer peripheral portion of the stator core and face each other while being spaced apart in the axial direction of the outer cylindrical portion. An outer cylinder member constituted by parts,
A plurality of strut members fitted between one and the other fastening plate portions of the plurality of sets;
The one fastening plate portion, the support column member, and the other fastening plate portion are penetrated in the axial direction of the outer cylinder member and coupled to the support body, and the outer cylinder member and the plurality of support members are supported. A support structure for a stator core, comprising: a plurality of fastening members integrally fastened to the body.   The stator core support structure according to claim 1, wherein the stator core includes a plurality of divided cores adjacent to each other in the rotation direction of the rotor.   The stator core support structure according to claim 1, wherein the plurality of pairs of fastening plate portions are spaced at equal intervals in a circumferential direction of the outer cylinder member. The plurality of pairs of fastening plate portions are provided at both ends of the outer cylinder member,
The flange according to any one of claims 1 to 3, wherein a flange connecting at least a pair of the fastening plate portions adjacent to each other is formed at each end portion of the outer cylinder member. The stator core support structure described. The plurality of fastening members are each composed of a plurality of fastening bolts screwed to the support,
The said one fastening plate part and said other fastening plate part of the both ends of the said outer cylinder member have a through-hole which can penetrate the said fastening bolt, respectively. The stator core support structure.   The stator core according to claim 5, wherein the support member has an intermediate through hole through which the fastening bolt can pass between the one fastening plate portion and the other fastening plate portion. Support structure.   The said support | pillar member has at least 2 intermediate | middle through-hole among these several intermediate | middle through-holes, The at least 2 bolt is penetrated in parallel among these several volt | bolts. The stator core support structure.   8. The stator core support structure according to claim 7, wherein the support member constitutes a cooling means for cooling the rotating machine.   9. The stator core support structure according to claim 8, wherein the support member forms a cooling passage through which a medium for cooling the rotating machine passes in the vicinity of the outer peripheral portion of the outer cylinder member.   The stator core support structure according to claim 8, wherein the support member has a thermal conductivity coefficient equal to or greater than a thermal conductivity coefficient of the outer cylinder member. A vehicle drive device having the stator core support structure according to any one of claims 1 to 10,
A case as the support body in which a stator core of the rotating machine is fastened by the plurality of fastening members, an input shaft and an output shaft that are rotatably supported by the case, and between the input shaft and the output shaft An intervening driving force transmission mechanism.   The vehicle drive device according to claim 11, wherein the rotating machine is a generator motor.

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