JP5215827B2 - Power transmission device - Google Patents

Description

  The present invention relates to a power transmission device, and in particular, it is possible to drive a load by transmitting power from a prime mover to a load using electromagnetic coupling between rotors, and further to power to a stator conductor. The present invention relates to a power transmission device capable of driving a load by supply.

  The related art of this type of power transmission device is disclosed in Patent Document 1 below. The power transmission device according to Patent Document 1 includes a stator having stator windings fixed to a machine frame, a first rotor having rotor windings connected to an engine output shaft, and a second rotor connected to drive wheels. And comprising. The stator is disposed at a position radially outside the first rotor with a space from the first rotor, and the second rotor is disposed at a position between the stator and the first rotor in the radial direction. In the second rotor, permanent magnets are respectively disposed on the outer peripheral surface facing the stator and the inner peripheral surface facing the first rotor. In Patent Document 1, the power from the engine transmitted to the first rotor is transmitted to the second rotor by electromagnetic coupling between the rotor winding of the first rotor and the permanent magnet on the inner peripheral surface of the second rotor. The driving wheels can be driven by the power of the engine. Further, by the electromagnetic coupling between the stator windings and the permanent magnets on the outer peripheral surface of the second rotor, power is supplied to the stator windings from the battery via the inverter to generate power in the second rotor to drive wheels. Can be driven.

Japanese Patent Laid-Open No. 11-187614 JP 2004-215393 A

  In Patent Document 1, the bearing for rotatably supporting the second rotor is supported by the stator case, whereas the bearing for rotatably supporting the first rotor is connected to the second rotor. Supported by the rotating member. Therefore, the support rigidity of the bearing for rotatably supporting the first rotor is reduced, and the backlash of the bearing is likely to increase. If a bearing for rotatably supporting the first rotor is supported by the stator case in order to improve the support rigidity, the support structure becomes complicated and the axial length of the power transmission device increases.

  The present invention can drive the load by transmitting the power from the prime mover to the load using electromagnetic coupling between the rotors, and can also drive the load by supplying power to the stator conductor. An object of the present invention is to improve the support rigidity of the rotor while shortening the axial length.

  The power transmission device according to the present invention employs the following means in order to achieve the above-described object.

  The power transmission device according to the present invention is connected to the first rotating shaft in a state of being disposed at a position radially outside the first rotating shaft, and is provided with a rotor conductor capable of generating a rotating magnetic field. A stator fixed to the stator case and disposed radially outside the first rotor, the stator having a stator conductor capable of generating a rotating magnetic field, and a radial direction; Is a second rotor that is connected to the second rotating shaft in a state of being arranged at a position between the stator and the first rotor and is rotatable relative to the first rotor, and is generated in the rotor conductor Torque acts on the first rotor in response to the applied rotating magnetic field, and torque acts on the stator in response to the rotating magnetic field generated in the stator conductor. A rotor, a first bearing for rotatably supporting the first rotor, and a second rotor for rotation A rotor bearing that generates a rotating magnetic field by causing an induced current to flow due to a rotational difference between the first rotor and the second rotor. And a power transmission device in which power from the prime mover is transmitted to one of the first rotating shaft and the second rotating shaft, and power is transmitted from the other of the first rotating shaft and the second rotating shaft to a load. A bearing support portion connected to the case and a bearing mounting portion connected to the second rotor are arranged at a position between the first rotating shaft and the first rotor in the radial direction, and the first bearing has a diameter of The first rotor is rotatably supported on the bearing support portion while being disposed at a position between the first rotating shaft and the bearing support portion in the direction, and the second bearing is supported in the radial direction by the bearing mounting portion and the bearing support. The second rotor is rotatably supported on the bearing support portion in a state where the second rotor is disposed between the two portions. And effect.

  In one aspect of the present invention, it is preferable that the first bearing and the second bearing are supported by the bearing support portion in a state where the positions of the first rotating shaft in the axial direction are substantially aligned with each other.

  In one aspect of the present invention, a power transmission unit for extracting AC power of the rotor conductor, and a power conversion unit capable of converting the AC power extracted by the power transmission unit and supplying the AC power to the stator conductor; It is preferable that the power transmission unit is disposed at a position between the first rotating shaft and the first rotor in the radial direction.

  In one aspect of the present invention, the connecting member for connecting the stator case and the bearing support portion is supplied with oil to the first bearing and the second bearing via the oil passage inside the first rotating shaft. Preferably, the oil passage is formed, and the connecting member includes an isolation part for separating the power transmission part from the first bearing and the second bearing. In this aspect, it is preferable that a seal member for sealing a communication portion between the oil passage of the isolation portion and the oil passage of the first rotation shaft is provided between the isolation portion and the first rotation shaft. .

  In one aspect of the present invention, the power transmission unit is connected to the brush connected to the power conversion unit and the rotor conductor of the first rotor, and is a slip ring that rotates with the first rotor while sliding with respect to the brush. It is preferable to include.

  In one aspect of the present invention, the power conversion unit includes a rectifier that rectifies the AC power extracted by the power transmission unit, and a DC-DC converter that converts the voltage rectified by the rectifier and outputs the voltage. It is preferable that the power converted into voltage by the DC converter can be converted into alternating current by the inverter and supplied to the stator conductor.

  In one aspect of the present invention, an engagement device capable of mechanically engaging the first rotor and the second rotor is a position between the first rotation shaft and the first rotor in the radial direction. It is preferable that they are arranged in the above.

  According to the present invention, the first bearing for rotatably supporting the first rotor and the second bearing for rotatably supporting the second rotor are arranged with the first rotating shaft and the first in the radial direction. While arrange | positioning in the position between rotors, it can be supported by the bearing support part connected with the stator case. As a result, it is possible to improve the support rigidity of the first rotor and the second rotor while reducing the axial length of the power transmission device.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as embodiments) will be described with reference to the drawings.

  1-3 is a figure which shows the outline of a structure of the hybrid drive device provided with the power transmission device which concerns on embodiment of this invention, FIG. 1 shows the outline of the whole structure, FIG. The outline of a structure is shown. The hybrid drive device according to the present embodiment includes an engine (internal combustion engine) 36 provided as a prime mover capable of generating power (mechanical power), a transmission 44 provided between the engine 36 and wheels 38, And the rotating electrical machine 10 provided between the engine 36 and the transmission 44. In addition, about the hybrid drive device which concerns on this embodiment, it can be used as a power output device for driving a vehicle, for example.

  The rotating electrical machine 10 includes a stator 16 fixed to a stator case, a first rotor 28 that can rotate relative to the stator 16, and a second rotor 18 that can rotate relative to the stator 16 and the first rotor 28. . The stator 16 is disposed at a position radially outward from the first rotor 28 and spaced from the first rotor 28, and the second rotor 18 is positioned between the stator 16 and the first rotor 28 in the radial direction. Is arranged. The first rotor 28 is mechanically coupled to the input shaft 34 (first rotational shaft) of the rotating electrical machine 10, and the input shaft 34 is mechanically coupled to the engine 36, whereby the input shaft 34 (first rotor 28). ) Receives power from the engine 36. On the other hand, the second rotor 18 is mechanically coupled to the output shaft 24 (second rotational shaft) of the rotating electrical machine 10, and the output shaft 24 is mechanically coupled to the wheel 38 via the transmission 44. Thus, the power from the output shaft 24 (second rotor 18) is transmitted to the wheels 38 after being shifted by the transmission 44. In the following description, the first rotor 28 is an input side rotor, and the second rotor 18 is an output side rotor.

  The stator 16 includes a stator core (stator core) 51 and a plurality of (for example, three-phase) stator windings (stator conductors) 20 disposed on the stator core 51 along the circumferential direction thereof. When a plurality of phases (for example, three phases) of alternating current flows through the plurality of stator windings 20, the stator windings 20 can generate a rotating magnetic field that rotates in the stator circumferential direction.

  The input-side rotor 28 includes a rotor core (first rotor core) 52 and a plurality of (for example, three-phase) rotor windings (rotor conductors) 30 disposed on the rotor core 52 along the circumferential direction thereof. Including. When a plurality of phases (for example, three phases) of alternating current flows through the plurality of rotor windings 30, the rotor windings 30 can generate a rotating magnetic field that rotates in the circumferential direction of the rotor.

  The output-side rotor 18 includes a rotor core (second rotor core) 53 and permanent magnets 32 and 33 that are disposed on the rotor core 53 along the circumferential direction thereof and generate a field magnetic flux. The permanent magnet 32 is disposed on the outer peripheral portion of the rotor core 53 so as to face the stator 16 (stator core 51), and the permanent magnet 33 is opposed to the input-side rotor 28 (rotor core 52) on the inner peripheral portion of the rotor core 53. Arranged. Here, the permanent magnets 32 and 33 can also be integrated.

  A more detailed configuration example of the input side rotor 28, the output side rotor 18, and the stator 16 is shown in FIG. In the example shown in FIG. 4, the input side rotor 28, the output side rotor 18, and the stator 16 are arranged concentrically. In the stator core 51 of the stator 16, a plurality of teeth 51 a protruding radially inward (toward the output-side rotor 18) are arranged at intervals along the circumferential direction of the stator. The magnetic pole is configured by being wound around the teeth 51a. A plurality of teeth 52a protruding radially outward (toward the output-side rotor 18) are arranged on the rotor core 52 of the input-side rotor 28 at intervals along the circumferential direction of the rotor. Is wound around these teeth 52a, thereby forming a magnetic pole. The teeth 51a of the stator 16 and the permanent magnets 32 of the output-side rotor 18 are opposed to each other in the radial direction perpendicular to the rotation center axis of the output-side rotor 18 (which coincides with the rotation center axis of the input-side rotor 28). The teeth 52a of the side rotor 28 and the permanent magnets 33 of the output side rotor 18 are arranged to face each other in the radial direction. The winding axis of the stator winding 20 and the winding axis of the rotor winding 30 coincide with this radial direction (the direction in which the input side rotor 28 and the output side rotor 18 face each other). The permanent magnets 32 and 33 are arranged at intervals in the circumferential direction of the rotor, and the permanent magnet 32 is embedded in the rotor core 53 in a V shape. However, the permanent magnets 32 and 33 may be exposed on the surface (outer peripheral surface or inner peripheral surface) of the output-side rotor 18 or may be embedded in the output-side rotor 18 (in the rotor core 53). .

  The clutch 48 can selectively perform mechanical engagement between the input shaft 34 (input-side rotor 28) and the output shaft 24 (output-side rotor 18) and release thereof by engagement / release. By engaging the clutch 48 and mechanically engaging the input-side rotor 28 and the output-side rotor 18, the input-side rotor 28 and the output-side rotor 18 are integrally rotated at the same rotational speed. On the other hand, by releasing the clutch 48 and releasing the mechanical engagement between the input-side rotor 28 and the output-side rotor 18, a difference in rotational speed between the input-side rotor 28 and the output-side rotor 18 is allowed. Here, the clutch 48 can be switched between engagement and disengagement using, for example, hydraulic pressure or electromagnetic force. Further, by adjusting the hydraulic pressure or electromagnetic force supplied to the clutch 48, The fastening force can also be adjusted.

  The chargeable / dischargeable power storage device 42 provided as a direct current power source can be constituted by a secondary battery, for example, and stores electrical energy. The inverter 40 includes a switching element (not shown), and converts DC power from the power storage device 42 into alternating current (for example, three-phase alternating current) by switching operation of the switching element, and converts each phase of the stator winding 20 to each phase. It is possible to supply.

  The slip ring 95 is mechanically coupled to the input side rotor 28 and is electrically connected to each phase of the rotor winding 30 and the brush 96. The slip ring 95 rotates with the input-side rotor 28 while sliding with respect to the brush 96 whose rotation is fixed (while maintaining electrical connection with the brush 96). The brush 96 is electrically connected to the rectifier 93, and power from the brush 96 is supplied to the rectifier 93. The slip ring 95 and the brush 96 can constitute a power transmission unit for extracting the power (AC power) of the rotor winding 30 of the input side rotor 28, and the extracted AC power is supplied to the rectifier 93. .

  The rectifier 93 rectifies AC power from the rotor winding 30 taken out by the slip ring 95 and the brush 96 and converts it into DC. The step-up converter (DC-DC converter) 94 includes a switching element, and boosts (voltage converts) DC power rectified by the rectifier 93 by the switching operation of the switching element and outputs it. The DC power boosted (voltage converted) by the boost converter 94 can be supplied to each phase of the stator winding 20 after being converted to AC by the inverter 40. That is, inverter 40 can convert either (at least one) of the DC power boosted by boost converter 94 and the DC power from power storage device 42 to AC and supply it to each phase of stator winding 20. It is. Further, the DC power boosted by the boost converter 94 can be recovered by the power storage device 42. As described above, the power converter that includes the rectifier 93 and the step-up converter 94 and that can convert the AC power extracted by the slip ring 95 and the brush 96 to be supplied to each phase of the stator winding 20 is configured. can do. Here, rectifier 93 performs power conversion in only one direction from slip ring 95 side to boost converter 94 side, and boost converter 94 is unidirectional from rectifier 93 side to power storage device 42 side (or inverter 40 side). Only perform power conversion. Therefore, the power conversion unit including rectifier 93 and boost converter 94 performs power conversion in only one direction from slip ring 95 side to power storage device 42 side (or inverter 40 side).

  The electronic control unit 50 controls the alternating current flowing through each phase of the stator winding 20 by controlling the switching operation of the switching element of the inverter 40. The electronic control unit 50 controls the boost ratio (voltage conversion ratio) in the boost converter 94 by controlling the duty ratio when the switching element in the boost converter 94 is switched. Furthermore, the electronic control unit 50 also controls the operating state of the engine 36 and the speed ratio of the transmission 44. Further, the electronic control unit 50 also performs control to switch mechanical engagement / release of the input side rotor 28 and the output side rotor 18 by switching engagement / release of the clutch 48.

  Examples of bearing structures of the input side rotor 28 and the output side rotor 18 are shown in FIGS. The input-side rotor 28 is disposed at a position radially outside the input shaft 34 with a space from the input shaft 34, and the input-side rotor 28 (rotor core 52) and the input shaft 34 form a substantially disc-shaped connecting member 81. Are connected through. Since the thickness of the connecting member 81 (the length of the input shaft 34 in the axial direction) is thinner than the thickness of the input side rotor 28 (rotor core 52), there is a gap between the input shaft 34 and the input side rotor 28 (rotor core 52). A space is formed. Then, a bearing (first bearing) 61 for rotatably supporting the input-side rotor 28, a bearing (second bearing) 62 for rotatably supporting the output-side rotor 18, and a connecting member 82 are used for the stator case. 15, a substantially cylindrical bearing support member 72 connected to 15, and a substantially cylindrical bearing mounting member 74 connected to the output-side rotor 18 via a connecting member 83, the input shaft 34 and the input-side rotor 28 in the radial direction. It is arrange | positioned in the position between (the rotor core 52). The bearing support member 72 is disposed at a position radially outside the input shaft 34 with a space from the input shaft 34, and the bearing mounting member 74 is spaced from the bearing support member 72 at a position radially outside the bearing support member 72. It is arranged with a gap. The inner ring 61a of the bearing 61 is attached to the input shaft 34, and the outer ring 61b of the bearing 61 is attached to the inner peripheral surface 72a of the bearing support member 72, so that the bearing 61 and the bearing support member are in the radial direction. The input-side rotor 28 is rotatably supported by the bearing support member 72 in a state where the input-side rotor 28 is disposed at a position between the inner peripheral surface 72a of 72. The inner ring 62a of the bearing 62 is attached to the outer peripheral surface 72b of the bearing support member 72, and the outer ring 62b of the bearing 62 is attached to the inner peripheral surface 74a of the bearing mounting member 74. The output side rotor 18 is rotatably supported by the bearing support member 72 in a state where the output side rotor 18 is disposed at a position between the outer peripheral surface 72 b of the bearing support member 72 and the inner peripheral surface 74 a of the bearing mounting member 74. Furthermore, the bearings 61 and 62 are supported by the bearing support member 72 in a state where the positions of the input shaft 34 in the axial direction (hereinafter simply referred to as the axial direction) are aligned (or substantially aligned) with each other. In the example shown in FIGS. 5 and 6, the bearings 61 and 62, the bearing support member 72, and the bearing mounting member 74 are arranged at positions on the engine 36 side (left side in FIGS. 5 and 6) with respect to the coupling member 81 in the axial direction. ing. The connecting member 83 is disposed at a position closer to the engine 36 than the input side rotor 28 and the output side rotor 18 in the axial direction, and is connected to the output side rotor 18 and the bearing mounting member 74 from the engine 36 side. The connecting member 82 is disposed closer to the engine 36 than the connecting member 83 in the axial direction, and is connected to the bearing support member 72 from the engine 36 side.

  The output side rotor 18 and the output shaft 24 are connected via a connecting member 84. In the example shown in FIG. 5, the connecting member 84 is disposed at a position closer to the transmission 44 than the input side rotor 28 and the output side rotor 18 with respect to the axial direction, and is connected to the output side rotor 18 from the transmission 44 side. ing. The bearing 63 for rotatably supporting the output side rotor 18 is disposed at a position closer to the transmission 44 than the bearing 62 with respect to the axial direction. The bearing 63 rotatably supports the output side rotor 18 by rotatably supporting the output shaft 24 on the stator case 15. A bearing 64 for rotatably supporting the input-side rotor 28 is disposed at a position closer to the transmission 44 than the bearing 61 with respect to the bearing 61 in the axial direction. The bearing 64 rotatably supports the input-side rotor 28 by rotatably supporting the input shaft 34 on the connecting member 84.

  The slip ring 95 and the brush 96 are disposed at a position between the input shaft 34 and the input-side rotor 28 (rotor winding 30) in the radial direction. In the example shown in FIGS. 5 and 6, the slip ring 95 and the brush 96 are disposed at positions closer to the engine 36 than the bearings 61 and 62 and the bearing support member 72 in the axial direction. The connecting member 82 is disposed at a position between the slip ring 95 and the brush 96 and the bearings 61 and 62 with respect to the axial direction, thereby providing an isolation member 82a for separating the slip ring 95 and the brush 96 from the bearings 61 and 62. Including. An oil passage 92 is formed inside the coupling member 82, an oil passage 91 is formed inside the input shaft 34, and the oil passage 92 formed inside the isolation member 82 a communicates with the oil passage 91 of the input shaft 34. Yes. A seal member 89 for sealing the communicating portion 90 between the oil path 92 of the isolation member 82a and the oil path 91 of the input shaft 34 is provided at a position between the isolation member 82a and the input shaft 34 in the radial direction. ing. The oil supplied to the oil passage 92 of the connecting member 82 is used to lubricate the bearings 61, 62, 63 by being supplied to the bearings 61, 62, 63 via the oil passage 91 of the input shaft 34, and input. By being supplied to the clutch 48 via the oil passage 91 of the shaft 34, it is used for the engagement / release switching operation of the clutch 48.

  The clutch 48 is disposed at a position between the input shaft 34 and the input-side rotor 28 (rotor winding 30) in the radial direction. In the example illustrated in FIG. 5, the clutch 48 is disposed at a position closer to the transmission 44 (right side in FIG. 5) than the coupling member 81 in the axial direction, and is disposed at a position between the coupling member 81 and the coupling member 84. ing. The clutch 48 selectively performs mechanical engagement between the input shaft 34 and the connecting member 84 and release thereof, thereby selectively performing mechanical engagement between the input side rotor 28 and the output side rotor 18 and release thereof. Is possible. A resolver 56 for detecting the rotation angle of the output shaft 24 (output-side rotor 18) is disposed at a position closer to the transmission 44 than the clutch 48 in the axial direction.

  When a plurality of phases (for example, three phases) of alternating current flows through the plurality of stator windings 20 by the switching operation of the inverter 40, the stator windings 20 generate a rotating magnetic field that rotates in the circumferential direction of the stator. The torque (magnet torque) can be applied to the output-side rotor 18 by electromagnetic interaction (attraction and repulsion) between the rotating magnetic field generated in the stator winding 20 and the field magnetic flux generated in the permanent magnet 32. The output side rotor 18 can be rotationally driven. That is, the electric power supplied from the power storage device 42 to the stator winding 20 can be converted into the power (mechanical power) of the output-side rotor 18. Further, the inverter 40 can also convert the alternating current flowing in each phase of the stator winding 20 into a direct current and recover the electric energy in the power storage device 42. In that case, the motive power of the output-side rotor 18 is converted into the electric power of the stator winding 20 and recovered by the power storage device 42. As described above, the stator winding 20 of the stator 16 and the permanent magnet 32 of the output side rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated in the stator winding 20 is applied to the output side rotor 18. A torque (magnet torque) can be applied between the stator 16 and the output-side rotor 18. Further, for example, as shown in FIG. 4, an example in which a magnetic material (ferromagnetic material) is disposed between the permanent magnets 32 as salient pole portions facing the stator 16 (tooth 51a), or the permanent magnet 32 is on the output side. In the example embedded in the rotor 18 (in the rotor core 53), the reluctance torque in addition to the magnet torque is also applied to the stator 16 and the output side rotor in response to the rotating magnetic field generated by the stator 16 acting on the output side rotor 18. 18 to act. The inverter 40 can perform bidirectional power conversion, and the power storage device 42 can transmit and receive power to and from the stator winding 20.

  Further, as the input side rotor 28 rotates relative to the output side rotor 18, a rotation difference is generated between the input side rotor 28 (rotor winding 30) and the output side rotor 18 (permanent magnet 33). An induced electromotive force is generated in the winding 30 and an induced current flows through the rotor winding 30 due to the induced electromotive force, thereby generating a rotating magnetic field. The torque can be applied to the output-side rotor 18 by the electromagnetic interaction between the rotating magnetic field generated by the induced current of the rotor winding 30 and the field flux of the permanent magnet 33, and the output-side rotor 18 is driven to rotate. Can do. As described above, the rotor winding 30 of the input-side rotor 28 and the permanent magnet 33 of the output-side rotor 18 are electromagnetically coupled, so that the rotating magnetic field generated in the rotor winding 30 acts on the output-side rotor 18. As a result, torque (magnet torque) acts between the input-side rotor 28 and the output-side rotor 18. Therefore, power (mechanical power) can be transmitted between the input-side rotor 28 and the output-side rotor 18, and an electromagnetic coupling function can be realized. Further, an example in which a magnetic body (ferromagnetic body) is disposed as a salient pole portion between the permanent magnets 33 so as to face the input side rotor 28 (tooth 52a), or the permanent magnet 33 is disposed in the output side rotor 18 (rotor core 53). In the example embedded in the inner), in accordance with the rotating magnetic field generated by the input-side rotor 28 acting on the output-side rotor 18, the reluctance torque in addition to the magnet torque is Acts during.

  When the torque is generated between the input side rotor 28 and the output side rotor 18 by the induced current of the rotor winding 30, the electronic control unit 50 causes the output voltage of the boost converter 94 to be higher than the voltage of the power storage device 42. Thus, the boost ratio in the boost converter 94 is controlled. As a result, a current flows from the boost converter 94 to the wiring between the power storage device 42 and the inverter 40, and an induced current flows through the rotor winding 30, so that torque acts between the input-side rotor 28 and the output-side rotor 18. On the other hand, the electronic control unit 50 controls the boost ratio in the boost converter 94 so that the output voltage of the boost converter 94 is lower than the voltage of the power storage device 42 in a state where the switching operation of the inverter 40 is not performed. Even if a rotational difference occurs between the side rotor 28 and the output side rotor 18, no induced current flows through the rotor winding 30, and no torque acts between the input side rotor 28 and the output side rotor 18. Also, by stopping the boosting (voltage conversion) by the boost converter 94 while maintaining the switching element in the boost converter 94 in the off state, the induced current does not flow through the rotor winding 30, and the input side rotor 28 and the output side Torque stops working with the rotor 18.

  Next, the operation of the hybrid drive device according to the present embodiment, particularly the operation when the wheels 38 are rotationally driven will be described.

  When the engine 36 is generating power, the power of the engine 36 is transmitted to the input side rotor 28, and the input side rotor 28 is rotationally driven. When the rotational speed of the input side rotor 28 becomes higher than the rotational speed of the output side rotor 18, an induced electromotive force is generated in the rotor winding 30. The electronic control unit 50 controls the boost ratio in the boost converter 94 so that the output voltage of the boost converter 94 is higher than the voltage of the power storage device 42, whereby an induced current flows in the rotor winding 30, and this induced current Torque acts on the output-side rotor 18 due to electromagnetic interaction between the magnetic field flux of the permanent magnet 33 and the output-side rotor 18. Thus, the power from the engine 36 transmitted to the input side rotor 28 is transmitted to the output side rotor 18 by electromagnetic coupling between the rotor winding 30 of the input side rotor 28 and the permanent magnet 33 of the output side rotor 18. The The power transmitted to the output-side rotor 18 is transmitted to the wheels 38 after being shifted by the transmission 44 and used for driving a load such as driving a vehicle. Therefore, the wheel 38 can be rotationally driven using the power of the engine 36. Further, since the rotational difference between the input-side rotor 28 and the output-side rotor 18 can be allowed, the engine 36 does not stall even if the rotation of the wheels 38 is stopped, and the rotating electrical machine 10 functions as a starting device. be able to. Therefore, it is not necessary to separately provide a starting device such as a friction clutch or a torque converter. Furthermore, since power can be transmitted between the input-side rotor 28 and the output-side rotor 18 without supplying power from the power storage device 42 to the stator winding 20, the power storage amount of the power storage device 42 is small. Even at extremely low temperatures, the power from the engine 36 can be transmitted to the wheels 38.

  Further, AC power generated in the rotor winding 30 is taken out via the slip ring 95 and the brush 96. The extracted AC power is rectified to DC by a rectifier 93, and the rectified DC power is boosted by a boost converter 94. Then, the DC power from the boost converter 94 is converted into AC by the inverter 40 and then supplied to the stator winding 20, whereby a rotating magnetic field is formed in the stator 16. Torque acts on the output side rotor 18 also by electromagnetic interaction between the rotating magnetic field of the stator 16 and the field flux of the permanent magnet 32 of the output side rotor 18. Thereby, a torque amplification function for amplifying the torque of the output side rotor 18 can be realized. It is also possible to collect DC power from boost converter 94 in power storage device 42.

  Furthermore, by controlling the switching operation of the inverter 40 so that electric power is supplied from the power storage device 42 to the stator winding 20, the wheels 38 are rotationally driven using the power of the engine 36, and the supplied electric power to the stator winding 20. The rotational drive of the wheel 38 can be assisted by the power of the output side rotor 18 generated by using. Further, at the time of load deceleration operation, the electronic control unit 50 controls the switching operation of the inverter 40 so that power is recovered from the stator winding 20 to the power storage device 42, so that the load power is transmitted to the stator winding 20 and the permanent magnet. The electric power of the stator winding 20 can be converted by the electromagnetic coupling with 32 and recovered in the power storage device 42.

  Further, when the vehicle speed (the rotational speed of the wheel 38) exceeds a certain speed and (the rotational speed of the output-side rotor 18)> (the rotational speed of the input-side rotor 28) is satisfied, the clutch 48 is engaged. By mechanically connecting the input side rotor 28 and the output side rotor 18, Joule loss caused by induction current flowing through the rotor winding 30 due to the slip between the input side rotor 28 and the output side rotor 18. Can be suppressed. When engaging the clutch 48, the torque transmitted between the input side rotor 28 and the output side rotor 18 can be limited by adjusting the fastening force of the clutch 48. Therefore, transmission of impact torque between the input side rotor 28 and the output side rotor 18 can be suppressed.

  In addition, when EV (Electric Vehicle) traveling is performed by driving the load using the power of the rotating electrical machine 10 without using the power of the engine 36 (rotating the wheel 38), the electronic control unit 50 By controlling the switching operation, drive control of the load is performed. For example, the electronic control unit 50 controls the switching operation of the inverter 40 so that power is supplied from the power storage device 42 to the stator winding 20, thereby supplying the stator winding 20 with the stator winding 20 and the permanent magnet 32. Is converted into the power of the output-side rotor 18 by the electromagnetic coupling, and the wheel 38 is rotationally driven. Thus, even if the engine 36 is not generating power, the wheels 38 can be rotationally driven by supplying power to the stator winding 20.

  In the power transmission device according to the present embodiment, in order to increase the support rigidity of the input-side rotor 28 and the output-side rotor 18, a bearing that rotatably supports the input-side rotor 28 and the output-side rotor 18 are rotatably supported. It is desirable to support the bearing to be supported by a fixed member of rotation. On the other hand, in this embodiment, the outer ring 61b of the bearing 61 that rotatably supports the input side rotor 28 and the inner ring 62a of the bearing 62 that rotatably supports the output side rotor 18 are both connected to the stator case 15. Since the bearing support member 72 is fixed (rotated and fixed), the support rigidity of the bearings 61 and 62 can be increased, and the play of the bearings 61 and 62 can be reduced. Furthermore, the bearing support member 72 that supports the bearings 61 and 62 is arranged at a position radially inward of the input-side rotor 28 (rotor core 52), so that the axial length of the power transmission device by the arrangement of the bearings 61 and 62 can be reduced. The increase can be suppressed. Therefore, according to the present embodiment, it is possible to improve the support rigidity of the input-side rotor 28 and the output-side rotor 18 while reducing the axial length of the power transmission device. Furthermore, the axial length of the power transmission device can be further shortened by supporting the bearings 61 and 62 on the bearing support member 72 in a state where the positions in the axial direction are aligned. In addition, about the connection member 82 with which the bearing support member 72 was connected, since the oil path 92 is formed, sufficient thickness is ensured and rigidity is high.

  Further, when the electric power generated in the rotor winding 30 is increased, the slip ring 95 and the brush 96 for taking out the electric power of the rotor winding 30 are also increased in size, and the axial length of the power transmission device is likely to increase. On the other hand, in the present embodiment, the axial length of the power transmission device is further shortened by arranging the slip ring 95 and the brush 96 at a position radially inward of the input side rotor 28 (rotor winding 30). be able to. Moreover, in this embodiment, the axial direction length of a power transmission device can further be shortened by arrange | positioning the clutch 48 in the position inside radial direction rather than the input side rotor 28 (rotor winding 30).

  Further, in the present embodiment, the electric power generated in the rotor winding 30 is taken out via the slip ring 95 and the brush 96 that slide with each other, and in order not to deteriorate the power transmission function in the slip ring 95 and the brush 96, It is desirable to prevent oil or the like from adhering to the sliding portion of the slip ring 95 and the brush 96. On the other hand, in this embodiment, since the connecting member 82 (isolation member 82a) shields the bearings 61 and 62 from the slip ring 95 and the brush 96, the oil supplied to the bearings 61 and 62 is slip ring 95 and the brush 96. It is possible to prevent scattering on the sliding portion. As a result, it is possible to prevent the power transmission function of the slip ring 95 and the brush 96 from deteriorating. Further, since the seal member 89 provided between the connecting member 82 (isolation member 82a) and the input shaft 34 prevents oil from flowing out through the communicating portion 90 between the oil passages 91 and 92, the slip ring 95 is prevented. In addition, the slip ring 95 and the brush 96 can be isolated from the oil atmosphere without separately providing a seal member for the brush 96.

  In the above description of the embodiment, the case where the boost converter 94 is provided as a DC-DC converter that converts the voltage rectified by the rectifier 93 and outputs the voltage is described. However, in this embodiment, it is also possible to provide a step-down converter or a step-up / down converter as the DC-DC converter.

  In the above description of the embodiment, the slip ring 95 and the brush 96 are used in the radial direction as the power transmission unit for taking out AC power from the rotor winding 30, and the input shaft 34 and the input-side rotor 28 (rotor winding 30). The case where it arrange | positions in the position between is demonstrated. However, in the present embodiment, a winding electrically connected to the rotor winding 30 is disposed as a power transmission unit for taking out AC power of the rotor winding 30 and mechanically coupled to the input side rotor 28. A transformer stator electrically connected to the rectifier 93 and provided with a winding that is electromagnetically coupled to the winding of the transformer rotor is provided with an input shaft 34 and an input-side rotor 28 (rotor) in the radial direction. It is also possible to arrange it at a position between the winding 30).

  In the present embodiment, the input shaft 34 and the output shaft 24 of the rotating electrical machine 10 can be interchanged, the second rotor 18 is mechanically connected to the input shaft 34, and the first rotor 28 is mechanically connected to the output shaft 24. Can also be linked together. That is, the second rotor 18 may be mechanically connected to the engine 36 and the first rotor 28 may be mechanically connected to the wheels 38 via the transmission 44. In this case, the power from the engine 36 is transmitted to the second rotor 18 connected to the input shaft 34, and the power from the first rotor 28 connected to the output shaft 24 is shifted by the transmission 44 to the wheels 38. Therefore, the second rotor 18 becomes an input side rotor, and the first rotor 28 becomes an output side rotor.

  As mentioned above, although the form for implementing this invention was demonstrated, this invention is not limited to such embodiment at all, and it can implement with a various form in the range which does not deviate from the summary of this invention. Of course.

It is a figure which shows schematic structure of a hybrid drive device provided with the power transmission device which concerns on embodiment of this invention. It is a figure which shows schematic structure of the power transmission device which concerns on embodiment of this invention. It is a figure which shows schematic structure of the power transmission device which concerns on embodiment of this invention. FIG. 3 is a diagram illustrating a configuration example of an input side rotor 28, an output side rotor 18, and a stator 16. It is a figure which shows the example of the bearing structure of the input side rotor 28 and the output side rotor 18 in the power transmission device which concerns on embodiment of this invention. It is a figure which shows the example of the bearing structure of the input side rotor 28 and the output side rotor 18 in the power transmission device which concerns on embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 15 Stator case, 16 Stator, 18 Output side rotor (2nd rotor), 20 Stator winding, 24 Output shaft, 28 Input side rotor (1st rotor), 30 Rotor winding, 32, 33 Permanent magnet , 34 input shaft, 36 engine, 38 wheels, 40 inverter, 42 power storage device, 44 transmission, 48 clutch, 50 electronic control unit, 56 resolver, 61, 62, 63, 64 bearing, 72 bearing support member, 74 bearing mounting Member, 81, 82, 83, 84 connecting member, 89 seal member, 91, 92 oil passage, 93 rectifier, 94 boost converter, 95 slip ring, 96 brush.

Claims (8)

A first rotor provided with a rotor conductor that is connected to the first rotary shaft in a state of being arranged at a position radially outside the first rotary shaft and capable of generating a rotating magnetic field;
A stator fixed to the stator case and disposed at a position radially outward from the first rotor, the stator being provided with a stator conductor capable of generating a rotating magnetic field;
A second rotor connected to the second rotary shaft in a state of being arranged at a position between the stator and the first rotor in the radial direction and capable of rotating relative to the first rotor, the rotor conductor Torque acts on the first rotor according to the action of the rotating magnetic field generated by the rotor, and torque acts on the stator according to the action of the rotating magnetic field generated by the stator conductor. A second rotor,
A first bearing for rotatably supporting the first rotor;
A second bearing for rotatably supporting the second rotor;
With
The rotor conductor generates a rotating magnetic field by causing an induced current to flow due to a difference in rotation between the first rotor and the second rotor,
A power transmission device in which power from a prime mover is transmitted to one of a first rotating shaft and a second rotating shaft, and power is transmitted from the other of the first rotating shaft and the second rotating shaft to a load,
A bearing support portion connected to the stator case and a bearing mounting portion connected to the second rotor are disposed at a position between the first rotating shaft and the first rotor in the radial direction,
The first bearing rotatably supports the first rotor on the bearing support portion in a state of being disposed at a position between the first rotating shaft and the bearing support portion in the radial direction,
The second bearing is a power transmission device that rotatably supports the second rotor on the bearing support portion in a state where the second bearing is disposed at a position between the bearing mounting portion and the bearing support portion in the radial direction. The power transmission device according to claim 1,
The first bearing and the second bearing are supported by the bearing support portion in a state where the positions of the first rotating shaft in the axial direction are substantially aligned with each other. The power transmission device according to claim 1 or 2,
A power transmission unit for taking out AC power of the rotor conductor;
A power conversion unit capable of converting the AC power extracted by the power transmission unit into power and converting it to the stator conductor;
Further comprising
The power transmission unit is a power transmission device arranged at a position between the first rotating shaft and the first rotor in the radial direction. The power transmission device according to claim 3,
An oil passage for supplying oil to the first bearing and the second bearing through the oil passage inside the first rotating shaft is formed in the connecting member for connecting the stator case and the bearing support portion,
The connection member is a power transmission device including an isolation part for separating the power transmission part from the first bearing and the second bearing. The power transmission device according to claim 4,
A power transmission device, wherein a seal member for sealing a communication portion between the oil passage of the isolation portion and the oil passage of the first rotation shaft is provided between the isolation portion and the first rotation shaft. The power transmission device according to any one of claims 3 to 5,
The power transmission part
A brush connected to the power converter,
A slip ring connected to the rotor conductor of the first rotor and rotating with the first rotor while sliding against the brush;
Including a power transmission device. The power transmission device according to any one of claims 3 to 6,
The power converter
A rectifier that rectifies the AC power extracted by the power transmission unit;
A DC-DC converter that converts the voltage of the power rectified by the rectifier and outputs the voltage;
Including
A power transmission device in which electric power converted by a DC-DC converter is converted into alternating current by an inverter and can be supplied to a stator conductor. The power transmission device according to any one of claims 1 to 7,
An engaging device capable of mechanically engaging the first rotor and the second rotor is disposed at a position between the first rotating shaft and the first rotor in the radial direction. Transmission device.

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