JP5141233B2 - Drive device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive device suppressed in the generation of vibration and noise. <P>SOLUTION: The drive device is provided with a drive case 21 for restricting storage parts 23b, 24b therein and connected to an engine case 10; a motor generator MG1 including an annular stator 32 and fixed into the storage part 23b; and a motor generator MG2 including an annular stator 39 and fixed into the storage part 24b. A fixing position of the stator 32 and a drive case 21 is positioned at the engine case 10 side, and a fixing position of the stator 39 and the drive case 21 is positioned at the engine side. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a drive device, and more particularly to a drive device including a plurality of motors.

  Conventionally, various types of drive devices for hybrid vehicles including a plurality of motor generators have been proposed. For example, in a drive device for a hybrid vehicle described in Japanese Patent Laid-Open No. 2003-191759, a first motor generator and a second motor generator are incorporated in a drive case 21 having an outer shape that becomes thinner as the distance from the engine increases. ing. Thereby, the increase in the outer diameter of the drive case is suppressed, and the mounting property to the vehicle is improved.

  Furthermore, in the vehicle drive device described in Japanese Patent Application Laid-Open No. 2007-159287, the rotor shaft is rotatably supported via needle bearings having both ends disposed on the outer peripheral surface of the input shaft. It is supported in the axial direction by a thrust needle bearing disposed at the axial end. Thus, by using a needle bearing as the support for the rotor shaft, the space for mounting the bearing is reduced, and the drive device is made compact.

In addition, in the electric vehicle driving apparatus described in Japanese Patent Application Laid-Open No. Hei 6-284665, the assembly position of the first rotor of the first motor and the assembly position of the second rotor of the second motor are set by a set angle in the rotation direction. The field timing is shifted by a set angle. Furthermore, in the stator fixing structure described in JP-A-2005-304213, the entire outer periphery of the stator core is pressed by an annular end plate.
JP 2003-191759 A JP 2007-159287 A JP-A-6-284665 JP-A-2005-304213

  However, the motor generator mounted on the conventional vehicle drive device is fixed at a position away from the engine case to which the drive device is fixed, so that the drive device is likely to vibrate, and noise is likely to occur. ing.

  The present invention has been made in view of the above problems, and an object of the present invention is to propose a drive device in which generation of vibration and noise is suppressed.

Driving device according to the present invention defines a first and second receiving chamber therein, a housing case to be connected to the engine case includes a first stator ring, first fixed to the first receiving chamber a rotating electric machine includes an annular second stator, and a second rotating electric machine is fixed to the second housing chamber. The fixed position between the first stator and the housing case is greater than that of one axial end face located on the opposite side of the engine case, of the axial end faces arranged in the first central axis direction of the first stator. Located on the case side. Further, the fixed position between the second stator and the housing case is determined by the engine case from one axial end surface located on the opposite side to the engine case, of the axial end surfaces arranged in the second central axis direction of the second stator. Located on the side.

Further comprising a first fixing member for fixing the upper Symbol accommodating case and the first stator, housing case and a second fixing member for fixing the second stator. Furthermore, the first fixing member includes a first engaging portion that engages with the housing case and a second engaging portion that engages with the first stator, and the second fixing member engages with the housing case. 3 engagement portions and a fourth engagement portion that engages with the second stator. Further, the first engagement portion is located closer to the engine case than the second engagement portion, and the third engagement portion is located closer to the engine case than the fourth engagement portion.

First and second stator upper SL is disposed coaxially, the first fixing member has a plurality are provided at intervals in the circumferential direction of the first stator, the second fixing member, the spacing in the circumferential direction of the second stator A plurality are provided with a gap therebetween. The first fixing member and the second fixing member are arranged so as to be shifted from each other in the circumferential direction of the first and second stators.

Good Mashiku has an outer diameter of the first stator and the outer diameter of the second stator differ from each other.

  According to the drive device of the present invention, it is possible to suppress generation of vibration and generation of noise.

  A vehicle drive device according to the present embodiment and a vehicle equipped with this vehicle drive device will be described with reference to FIGS.

  Note that in the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. In the following embodiments, each component is not necessarily essential for the present invention unless otherwise specified. In addition, when there are a plurality of embodiments below, it is planned from the beginning to appropriately combine the features of each embodiment unless otherwise specified.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the present embodiment, an example applied to a hybrid vehicle having a front engine rear drive (FR) type drive system will be described, but the present invention is not limited to this front engine rear drive type. FIG. 1 is a plan view schematically showing the configuration of the hybrid vehicle according to Embodiment 1 of the present invention.

  As shown in FIG. 1, the hybrid vehicle 11 includes an engine 12, a drive device 14 on which a motor generator is mounted, front wheels, and rear wheels as drive wheels 13.

  A drive device 14, a propeller shaft 15, a differential 16 and a transaxle 17 are provided between the engine 12 and the drive wheels 13.

  The propeller shaft 15 is a shaft for transmitting power from the driving device 14 to the differential 16. Further, the differential 16 is a shaft portion for transmitting the power from the propeller shaft 15 to the drive wheels 13.

  Here, the drive device 14 and the propeller shaft 15 are disposed below the floor panel 18 provided at the bottom of the room, and are disposed in the floor tunnel.

  FIG. 2 is a cross-sectional view of drive device 14 according to Embodiment 1 of the present invention. As shown in FIG. 2, one end surface of the drive device 14 is fixed to the engine case 10. On the other hand, the drive device 14 is supported by the engine mount at a position away from the engine case 10. A damper member such as a resin is provided in the engine mount.

  Here, the drive device 1 includes a housing case 23b and a drive case 21 formed with a housing portion 24b positioned on the opposite side of the engine case with respect to the housing portion 23b, and the engine case 10 side with respect to the housing portion 23b. The transaxle damper 46 arranged, the motor generator MG1 accommodated in the accommodating portion 23b, the motor generator MG2 accommodated in the accommodating portion 24b, the power split mechanism 27, and the speed reducing mechanism 28 are provided.

  The transaxle damper 46 is connected to the crankshaft 47 of the engine 12 and the input shaft 45, reduces torque fluctuations in the crankshaft 47, and transmits power from the crankshaft 47 to the input shaft 45.

  Motor generator MG1 is housed in housing portion 23b. The motor generator MG1 includes a rotor 33 that is rotatably provided on the drive case 21, an annular stator 32 that is disposed around the rotor 33, and a stator coil 36 that is provided on the stator 32.

  Hybrid vehicle 11 includes a high voltage battery 62 in which electric power to be supplied to stator coil 36 of motor generator MG1 is stored, and an inverter 61 that converts DC power from high voltage battery 62 into three-phase AC power. ing. The stator coil 36 is supplied with three-phase AC power from the inverter 61.

  The stator 32 is fixed to the housing portion 23b by a plurality of fastening members 34. A stepped portion 79 is formed on a portion of the inner surface of the drive case 21 that defines the housing portion 23b on the engine case 10 side, and the stator 32 is fixed to the stepped portion 79 by a fastening member 34. ing. In the example shown in FIG. 2, a bolt is employed as the fastening member 34. The fastening member 34 includes a head portion 70 and a shaft portion 71 which is connected to the head portion 70 and has a screw portion formed on the surface thereof. The shaft portion 71 is a through hole 72 formed in the stator 32. Has been inserted inside.

  Of the main surfaces 77 and 78 of the stator 32 arranged in the direction of the central axis of the stator 32, the tip end portion of the shaft portion 71 protrudes from the main surface 78 located on the engine case 10 side, and the screw hole formed in the step portion 79. It is screwed. The head portion 70 is disposed on a main surface 77 located on the opposite side of the engine case 10 and presses the stator 32 toward the stepped portion 79.

  Thus, the stator 32 is fixed to the drive case 21 by the main surface 78 located on the engine case 10 side with respect to the main surface 77. Thus, the stator 32 is fixed at a position close to the engine case 10.

  As described above, since the fixed position between the motor generator MG1 and the drive case 21 is close to the engine case 10, even if the motor generator MG1 vibrates and the drive case 21 is driven by the motor generator MG1. Large vibrations can be suppressed.

  The power split mechanism 27 distributes the power to a vehicle driving force for transmitting the power from the engine 12 to the drive wheels 13 and a power generation driving force for driving the motor generator MG1 to generate power. The power split mechanism 27 includes a sun gear 52, a pinion gear 55, a ring gear 53, and a planetary carrier 54. Sun gear 52 is integrally connected to motor generator MG1 on input shaft 45. The ring gear 53 is integrally connected to the end of the intermediate shaft 48. Further, the planetary carrier 54 is integrally connected to the input shaft 45. The pinion gear 55 is provided so as to be rotatable with respect to the planetary carrier 54, and is provided on the outer periphery of the sun gear 52 so as to be rotatable.

  A plurality of pinion gears 55 are provided on the sun gear 52, and the pinion gear 55 meshes with the sun gear 52, and the pinion gear 55 is disposed on the inner peripheral side of the ring gear 53 and formed on the inner peripheral surface of the ring gear 53. Is engaged with the gear portion.

  The power split mechanism 27 is transmitted to the rotor 33 via the planetary carrier 54, the pinion gear 55 and the sun gear 52 when the input shaft 45 is rotationally driven by the power from the engine 12. Thereby, the rotor 33 generates electric power as a generator.

  Further, the power from the engine 12 transmitted to the input shaft 45 is transmitted to the intermediate shaft 48 via the planetary carrier 54, the pinion gear 55 and the ring gear 53.

  The motor generator MG2 is housed in the housing portion 24b. The rotor 41 is rotatably provided in the drive case 21, the annular stator 39 disposed so as to cover the periphery of the rotor 41, and the rotor 39. And a stator coil 44 provided on the stator 39. The stator coil 44 is supplied with three-phase AC power from the inverter 61.

  The stator 39 is fixed in the accommodating portion 24b by a plurality of fastening members 42 such as bolts. A stepped portion 80 is formed in a portion of the inner surface of the drive case 21 that defines the accommodating portion 24b, which is located on the engine case 10 side. The stator 39 is pressed and fixed to the surface of the stepped portion 80 by a fastening member 42.

  In the example shown in FIG. 2, a bolt is employed as the fastening member 42, and includes a head portion 74 and a shaft portion 76 that is connected to the head portion 74 and has a screw portion formed on the surface thereof. . The stator 39 is formed with a through hole 75 extending in the central axis direction of the stator 39, and the shaft portion 76 is inserted into the through hole 75.

  Of the main surfaces 81 and 82 arranged in the central axis direction of the stator 39, the tip end portion of the shaft portion 76 protrudes from the main surface 82 located on the engine case 10 side, and the head portion 74 is disposed on the main surface 81. Has been.

  Here, the head portion 74 presses the stator 39 toward the engine case 10, and the main surface 82 of the engine case 10 is pressed against the surface of the stepped portion 80, whereby the stator 39 is driven. It is fixed to the case 21.

  Thus, also in the motor generator MG2, the stator 39 is fixed to the portion located on the engine case 10 side of the inner surface of the drive case 21 that defines the accommodating portion 24b. As a result, even if the motor generator MG2 is driven and vibration or the like occurs in the motor generator MG2, it is possible to suppress the vibration up to the drive case 21.

  Deceleration mechanism 28 is arranged on the side opposite to engine case 10 with respect to motor generator MG2. The speed reduction mechanism 28 also includes a sun gear 56, a ring gear 57, a pinion gear 59, and a planetary carrier 58, and is accommodated in the drive case 21. The sun gear 56 is integrally connected to the rotor 41 on the intermediate shaft 48.

  The ring gear 57 is integrally connected to the intermediate shaft 48 and the output shaft 49, and the planetary carrier 58 is fixed to the drive case 21. The pinion gear 59 is rotatably provided on the planetary carrier 58 and meshes with both the pinion gear 59 and the sun gear 56. Pinion gear 59 meshes with both sun gear 56 and ring gear 57.

  In the speed reduction mechanism 28, when the rotor 41 is driven to rotate, the power of the rotor 41 is transmitted to the sun gear 56. The power transmitted to the sun gear 56 is transmitted to the pinion gear 59 and the ring gear 57 and output to the output shaft 49.

  As shown in FIG. 2, the rotation centers of the input shaft 45, the intermediate shaft 48, the output shaft 49, the rotor 33, and the rotor 41 are all the rotation center O. Furthermore, the stator 32 and the stator 39 The central axis also coincides with the rotation center O.

  FIG. 3 is a plan view of the stator 32, and FIG. 4 is a plan view of the stator 39. As shown in FIGS. 3 and 4, the through hole 72 formed in the stator 32 and the through hole 75 formed in the stator 39 are arranged so as to be shifted from each other in the circumferential direction of the stators 32 and 39. Yes.

  Accordingly, the fastening member 34 for fixing the stator 32 and the fastening member 42 for fixing the stator 39 are arranged so as to be shifted from each other in the circumferential direction, and the fixing position of the stator 32 and the fixing position of the stator 39 are It is displaced in the direction.

  Thus, since the fixed position of the stator 32 and the fixed position of the stator 39 are shifted in the circumferential direction, the vibration generated in the drive case 21 and the motor generator MG2 are driven when the motor generator MG1 is driven. Thus, the resonance of the vibration generated in the drive case 21 can be suppressed.

  For example, the primary vibration mode generated around the stator 32 has an elliptical shape indicated by a broken line L <b> 1, and the through holes 72 positioned so as to face each other through the center of the stator 32 are positioned on the long diameter. Also, in the primary vibration mode generated around the stator 39, the elliptical shape as shown by the wiring L2 in FIG. 4 is formed, and the through holes 75 positioned so as to face each other through the center of the stator 39 have a long diameter. Located on the top.

  For this reason, even if vibrations occur around the stator 32 and around the stator 39 at the same time, the mutual vibrations can be suppressed from resonating and large vibrations can be prevented from occurring in the drive case 21. be able to.

  In the example shown in FIGS. 3 and 4, four through holes 72 are provided at equal intervals along the outer peripheral edge of the stator 32. Further, four through holes 75 are arranged at intervals along the outer peripheral edge of the stator 39. In the example shown in FIGS. 3 and 4, the angle θ between the through holes 72 is 90 degrees, which are equally spaced.

  And the through-hole 75 is arrange | positioned so that it may be located between the through-holes 72, and is arrange | positioned in the position used as the intermediate position between the adjacent through-holes 72. FIG. For this reason, the space | interval between the through-hole 75 and the through-hole 72 is (theta) / 2. Thereby, for example, in the drive case 21, the primary vibration mode in the portion located around the stator 32 and the first vibration mode in the portion located around the stator 39 are orthogonal to each other.

  As a result, it is assumed that vibration in the first vibration mode occurs in a portion of the drive case 21 located around the stator 32, and further vibration in the second vibration mode occurs in a portion located around the stator 39. Moreover, it can suppress that it mutually resonates.

  FIG. 5 is a plan view showing a modification of the stator 32, and FIG. 6 is a plan view showing a modification of the stator 39.

  As shown in FIG. 5, three through holes 72 are arranged at equal intervals in the stator 32. As shown in FIG. 6, three through holes 75 are also arranged around the stator 39 at equal intervals. Thus, the fastening member 34 is inserted into the disposed through hole 72. When the motor generator MG1 is driven, a primary vibration mode generated in a portion of the drive case 21 located around the stator 32 has an elliptical shape as indicated by a broken line in FIG. One through hole 72 is located.

  The angle θ between the through holes 72 is 120 degrees, and each through hole 75 is positioned at a position shifted by θ / 3 with respect to each through hole 72. A fastening member 42 is inserted into each through hole 72, and the stator 32 is fixed to the drive case 21.

  When the motor generator MG2 is driven, the primary vibration mode of vibration generated in a portion of the drive case 21 located around the stator 39 is also elliptical as shown by a broken line in FIG. .

  Here, the through hole 75 and the fastening member 42 are arranged so as to be shifted from the through hole 72 and the fastening member 34 by an angle θ / 3. For this reason, the vibration of the primary vibration mode generated in the portion located around the stator 32 of the drive case 21 and the vibration of the primary vibration mode generated in the portion located around the stator 39 resonate with each other. Can be suppressed.

  Thereby, it can suppress that a big vibration and noise arise in the drive case 21. FIG.

  Preferably, the outer diameter of the stator 32 and the outer diameter of the stator 39 are made different. Thereby, the natural frequency of the portion located around the stator 32 and the natural frequency of the portion located around the stator 39 can be shifted. Thereby, it can suppress that the part located around the stator 39 among the drive cases 21 and the part located around the stator 32 among the drive cases 21 resonate by the same vibration.

  FIG. 7 is a cross-sectional view showing a modification of drive device 14 according to Embodiment 1 of the present invention. As shown in FIG. 7, it is a cross-sectional view of drive device 14 showing a modification of the fixing method of motor generators MG1, MG2. In the example shown in FIG. 7, the peripheral surface of motor generator MG <b> 1 has a press-fit portion 83 in which a portion located on the engine case 10 side is press-fitted into press-fit recess 87, and A portion located on the opposite side of 10 is a protruding portion 84 protruding from the press-fit recess 87.

  Also in the example shown in FIG. 7, motor generator MG1 is fixed at a portion close to engine case 10, and drive case 21 vibrates greatly due to vibration generated in motor generator MG1 when motor generator MG1 is driven. This can be suppressed. The press-fit recess 87 is formed in a portion located on the engine case 10 side of the inner peripheral surface of the drive case 21 that defines the accommodating portion 23b.

  Also in motor generator MG2, stator 39 is positioned on the opposite side to engine case 10 with respect to press-fit portion 85 press-fitted into press-fit recess 88 press-fitted into housing portion 24b. , And a protrusion 86 protruding from the press-fit recess 88. As described above, the motor generator MG2 is also fixed at the portion located on the engine case 10 side, and even if the motor generator MG2 vibrates when driven, it is suppressed that the drive case 21 vibrates greatly. . The press-fit recess 88 is also formed in a portion located on the engine case 10 side in the inner peripheral surface of the drive case 21 that defines the accommodating portion 24b.

(Embodiment 2)
A drive device 14 according to Embodiment 2 of the present invention will be described with reference to FIG. In addition, about the structure which is the same as that of the structure shown in FIG. 8, or equivalent, the same code | symbol may be attached | subjected and the description may be abbreviate | omitted. FIG. 8 is a cross-sectional view of the drive device 14 according to Embodiment 2 of the present invention. As shown in FIG. 8, the drive case 21 has a housing portion 23b for housing the motor generator MG1 and a housing portion 24b for housing the motor generator MG2 for housing the motor generator MG2, and the housing portion 23b. And the accommodating part 24b are arranged in the engine case 10 along the surface.

  A step portion 79 is formed on a portion of the inner surface of the housing portion 23b located on the engine case 10 side, and the stator 32 is fixed to the step portion 79. Further, a stepped portion 80 is formed in a portion located on the engine case 10 side of the inner surface of the accommodating portion 24b, and the stator 39 is fixed to the stepped portion 80.

  Thus, according to drive device 14 according to Embodiment 2 of the present invention, each of motor generators MG1, MG2 is fixed to drive case 21 at a position close to engine case 10. For this reason, also in the drive device 14 according to the second embodiment, the drive case 21 vibrates greatly when the motor generator MG1 and the motor generator MG2 are driven as in the drive device 14 according to the second embodiment. Can be suppressed.

  Although the embodiment of the present invention has been described above, it should be considered that the embodiment disclosed this time is illustrative and not restrictive in all respects. The scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims. Furthermore, the above numerical values are examples, and are not limited to the above numerical values and ranges.

  The present invention relates to a drive device, and is particularly suitable for a drive device for a vehicle.

1 is a plan view schematically showing a configuration of a hybrid vehicle according to an embodiment of the present invention. It is sectional drawing of the drive device which concerns on Embodiment 1 of this invention. It is a top view of a stator. It is a top view of a stator. It is a top view which shows the modification of a stator. It is a top view which shows the modification of a stator. It is sectional drawing which shows the modification of the drive device which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the modification of the drive device which concerns on Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 engine case, 11 hybrid vehicle, 12 engine, 12A engine case engine, 13 drive wheel, 14 drive device, 15 propeller shaft, 16 differential, 17 transaxle, 18 floor panel, 21 drive case, 23b accommodating part, 24b Housing, 27 Power split mechanism, 28 Deceleration mechanism, 32 Stator, 33 Rotor, 34 Fastening member, 36 Stator coil, 39 Stator, 41 Rotor, 42 Fastening component, 44 Stator coil, 45 Input shaft, 46 Transaxle damper, 47 Crankshaft, 48 Intermediate shaft, 49 Output shaft, 61 Inverter, 62 High voltage battery, 70 Head section, 71 Shaft section, 72 Through hole, 74 Head section, 75 Through hole, 76 Shaft section, 77, 78 Main surface, 79 Step, 80 steps Parts, 83 press-84 protrusion 85 press-86 protrusion 87 press-fit recess, 88 press-fit recess, MG1, MG2 motor-generator.

Claims (2)

A storage case that defines first and second storage chambers and is connected to the engine case;
Includes a first stator ring, a first rotating electric machine is fixed to the first housing chamber,
Comprises a second stator ring, and a second rotating electric machine is fixed to the second housing chamber,
A first fixing member that fixes the housing case and the first stator;
A second fixing member for fixing the housing case and the second stator ;
The fixed position between the first stator and the housing case is more than the one axial end surface located on the opposite side of the engine case among the axial end surfaces arranged in the first central axis direction of the first stator. Located on the engine case side,
The fixing position of the second stator and the housing case is determined from the one axial end surface located on the opposite side of the engine case among the axial end surfaces arranged in the second central axis direction of the second stator. Located on the engine case side
The first fixing member includes a first engagement portion that engages with the housing case and a second engagement portion that engages with the first stator,
The second fixing member includes a third engagement portion that engages with the housing case and a fourth engagement portion that engages with the second stator,
The first engagement portion is positioned closer to the engine case than the second engagement portion; the third engagement portion is positioned closer to the engine case than the fourth engagement portion;
The first and second stators are arranged coaxially,
A plurality of the first fixing members are provided at intervals in the circumferential direction of the first stator, and a plurality of the second fixing members are provided at intervals in the circumferential direction of the second stator,
The drive device , wherein the first fixing member and the second fixing member are arranged so as to be shifted from each other in a circumferential direction of the first and second stators . Wherein the outer diameter of the first stator, are different from each other and the outer diameter of the second stator, a driving apparatus according to claim 1.

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