JP5087805B2 - Power equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the increase in revolutions of an electric motor in a power system having a differential device in which four rotating elements are arrayed on a collinear chart, an engine and a driven part are coupled to two inside rotating elements, and the electric motor is coupled to outside rotating elements. <P>SOLUTION: The power system comprises a first clutch 55, which switches a state in which a second motor generator 50 is coupled to a ring gear 32 of a second planetary gear mechanism 30 and a state in which the coupling is released, and a second clutch 56, which switches a state in which the second motor generator 50 is coupled to a carrier 34 of the second planetary gear mechanism 30 and a state in which the coupling is released. An ECU 65 controls the engaged state and disengaged state of the first clutch 55 and the second one 56 to switch an operation state of 1 collinear and 4 elements, in which the second motor generator 50 is coupled to the ring gear 32, and an operation state of 1 collinear and 3 elements, in which the second motor generator 50 is coupled to the carrier 34. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a power plant having four rotating elements arranged on a nomograph.

  Conventionally, as shown in FIG. 12, a power plant 100 having four rotating elements (engine 103, driving wheels 102 and 102, first electric motor 140, second electric motor 150) arranged on a collinear diagram is known. (For example, refer to Patent Document 1).

  12 includes two planetary gear mechanisms (a first planetary gear mechanism 120 and a second planetary gear mechanism 130). The carrier 124 of the first planetary gear mechanism 120 and the second planetary gear mechanism 130 are provided. And the ring gear 122 of the first planetary gear mechanism 120 and the carrier 134 of the second planetary gear mechanism 130 are connected. Further, the sun gear 121 of the first planetary gear mechanism 120 is connected to the first electric motor 140, and the first planetary gear mechanism 120 ring gear 122 and the carrier 134 of the second planetary gear mechanism 130 are connected to the drive wheels 102, 102.

The engine 103 is connected to the carrier 124 of the first planetary gear mechanism 120 and the sun gear 131 of the second planetary gear mechanism 130, and the second electric motor 150 is connected to the ring gear 132 of the second planetary gear mechanism 130.
JP 2002-281607 A

  In the conventional power plant 100 described above, on the nomographic chart, the first electric motor 140 and the second electric motor 150 are arranged on the outer side, and the engine 103 and the drive wheels 102 and 102 are arranged on the inner side. Therefore, when the rotational speed of the drive wheels 102 and 102 increases during high-speed traveling, the rotational speed of the second electric motor 150 becomes higher than that of the drive wheels 102 and 102 (HIGH gear ratio setting).

  In order to cope with the rotation of the second electric motor 150 at such a high speed as described above, the rotor of the second electric motor 150 must be strong enough to withstand the high speed rotation, and the size and cost of the second electric motor 150 can be increased. There was an inconvenience of accompanying up. Further, at the time of high-speed rotation, there is a disadvantage that the loss of the second electric motor 150 and the switching loss in the PDU (Power Drive Unit) that drives the second electric motor 150 become large.

  The present invention has been made in view of such a background, in which four rotating elements are arranged on a collinear diagram, a motor and a driven part are connected to two inner rotating elements, and an outer rotating element is connected. An object of the present invention is to suppress an increase in the number of revolutions of a motor in a power unit having a differential gear connected to the motor.

The present invention has been made to achieve the above object, and is provided with a differential device in which four rotating elements are arranged on a collinear diagram, and disposed inside the collinear diagram among the rotating elements. A prime mover connected to one of the second rotating element and the third rotating element, and a driven part connected to the other, and a first rotating element arranged outside in the collinear diagram of the rotating elements And a first motor connecting element which is a rotating element provided with the first motor among the first rotating element and the fourth rotating element. A first clutch that switches between a state in which the first motor is connected and a state in which the connection is released, and the first motor connecting element of the second rotating element and the third rotating element, Adjacent to the first motor, which is an adjacent rotating element on the collinear diagram And iodine, and a state in which said first electric motor is connected, and a second clutch for switching between a state in which the coupling is released, and the first electric motor connecting element and the first electric motor is coupled by the first clutch And a one-collinear four-element operating state in which the connection between the first motor adjacent element and the first motor is released by the second clutch, and the first motor connecting element and the first by the first clutch. The switching of the one-collinear three-element operation state in which the connection with the electric motor is released and the first motor adjacent element and the first motor are connected by the second clutch is performed on the first motor connecting element. Rotating element number switching means is provided when the difference between the rotating speed and the rotating speed of the first electric motor adjacent element is a predetermined value or less .

According to the present invention, the first motor connecting element and the first motor are connected by the first clutch, and the first motor adjacent element and the first motor are connected by the second clutch. In the released state, the second and third rotating elements individually connected to either the prime mover or the driven part, and the first rotating element. The four rotating elements, the first rotating element and the fourth rotating element connected to any one of the electric motors, are in a one-collinear four-element operating state that rotates while maintaining the positional relationship on the one-collinear diagram. Can do.
According to the present invention, when the difference between the rotation speed of the first motor connecting element and the rotation speed of the first motor adjacent element is equal to or less than the predetermined value by the rotation element number switching means, By switching from the one-collinear four-element operating state to the one-collinear three-element operating state by the first clutch and the second clutch, it is possible to reduce a shock generated at the time of switching.

  Meanwhile, the first clutch connecting element and the first motor are disconnected by the first clutch, and the first motor adjacent element and the first motor are connected by the second clutch. In this state, the differential device is connected to either the prime mover or the driven part individually with the second rotating element and the third rotating element (the second rotating element and the third rotating element). The first electric motor is connected to one of the rotating elements), and the three rotating elements of the first rotating element and the fourth rotating element that are not the first motor connecting element However, it can be set as the 1-collinear 3 element operation state which rotates, maintaining the arrangement | positioning relationship on a 1-collinear diagram.

  Then, by setting the differential device to a one-collinear four-element operation state, the transmission ratio between the driving source and the driven part is set to one of the first rotating element and the fourth rotating element. By controlling the rotational speeds of the first motor and other motors that are individually connected, the high gear ratio side (the rotational speed of the prime mover <the rotational speed of the driven part) and the low gear ratio side (of the prime mover) Rotational speed> Rotational speed of the driven part).

  In addition, when the differential device is in a one-collinear four-element operation state, the rotational speed of the first motor adjacent element connected to the driving source or the driven part is increased, and the first When the rotation speed of the one motor connecting element becomes higher than the rotation speed of the adjacent element of the first motor, the first clutch and the second clutch are used to switch the differential to the one-collinear three-element operation state. Thus, the rotation speed of the first electric motor can be suppressed to the rotation speed of the first electric motor adjacent element. As a result, the rotational speed of the first electric motor can be reduced, and the strength required of the rotor of the first electric motor can be reduced. Moreover, the loss in the first motor and the switching loss in the drive circuit of the first motor can be reduced. Furthermore, since the back electromotive force generated by the rotation of the first electric motor can be reduced, the motor torque constant of the first electric motor can be increased to reduce the energization amount. The drive circuit can be downsized and the copper loss of the first electric motor can be reduced.

  In addition, the differential device includes first, second, and third elements arranged on a collinear diagram, and energy input to the second element is converted into the first and third elements. An energy distribution / synthesis device having a function of distributing to elements and a function of combining energy input to the first and third elements and outputting to the second element; A mechanical differential device having fourth, fifth, and sixth elements, a first coupling portion that mechanically couples the first element and the fifth element, and the second A second connecting portion that mechanically connects the fourth element and the fourth element, and the first rotating element corresponds to one of the third element and the sixth element. In addition, the fourth rotating element corresponds to the other, and the second rotating element is connected to the first connecting portion by the first connecting portion. The third element corresponds to one of the element, the fifth element, and the second element and the fourth element connected by the second connecting portion, and the third rotating element corresponds to the other. The first motor is provided for the sixth element, and the sixth element is the first motor connecting element.

  According to the present invention, a differential device in which four rotating elements are arranged on the collinear diagram described above can be configured by a combination of the energy distribution / synthesis device and the mechanical differential device. .

  In addition, the energy distribution / synthesis device includes a stator for generating a rotating magnetic field, a magnet, a first rotor provided facing the stator, and a soft magnetic material. And the second rotor provided between the first rotor, the first rotor, the second rotor, and the third rotor are individually assigned to the first rotor, the second rotor, and the third rotor. And the second rotor input and output energy via a magnetic circuit formed along with the generation of the rotating magnetic field, and the rotating magnetic field and the second rotor along with the input and output of the energy. One rotor and the second rotor are configured to rotate.

  According to the present invention, the energy distribution / combination device is configured by an electric motor having the stator, the first rotor, and the second rotor. In this electric motor, energy is input / output between the stator, the first rotor, and the second rotor via a magnetic circuit formed in association with generation of a rotating magnetic field by the stator. As the energy is input / output, the rotating magnetic field, the first rotor, and the second rotor rotate while maintaining the positional relationship on the one collinear diagram. Here, the relationship between the rotation magnetic field of the stator and the rotation speeds of the first rotor and the second rotor corresponds to the rotation speed relationship between the sun gear of the planetary gear mechanism, the ring gear, and the carrier that indicates the planetary gear.

  In this way, the energy distribution / combination device is configured by an electric motor having the stator, the first rotor, and the second rotor, thereby eliminating the need for a planetary gear mechanism for distributing and combining power. Therefore, the number of parts can be reduced and the size can be reduced. In addition, energy transfer between the stator, the first rotor, and the second rotor is performed by a non-contact magnetic path through a magnetic circuit, and no mechanical transmission loss occurs, so that driving efficiency is increased. Can do.

  The energy distribution / synthesis apparatus includes a mechanical differential device having the first element, the second element, and the third element, and a second electric motor coupled to the third element. It is characterized by having.

  According to the present invention, the energy distribution / synthesis device can be easily configured by a combination of a general mechanical actuator such as a planetary gear mechanism and the second electric motor.

  Further, the first electric motor is provided for one of the first rotating element and the fourth rotating element, and the second electric motor is provided for the other, and the first rotating element and the fourth rotating element are provided. Of the elements, a second motor connecting element that is a rotating element provided with the second motor, and a third clutch that switches between a state in which the second motor is connected and a state in which the connection is released, Of the second rotating element and the third rotating element, the second motor connecting element and the second motor adjacent element which is a rotating element adjacent on the collinear diagram are connected to the second motor. And a fourth clutch for switching between the state and the state in which the connection is released.

  According to the present invention, the second motor is provided with the third clutch and the fourth clutch, and the connection between the second motor connecting element and the second motor is released by the third clutch. In addition, the second motor adjacent element and the second motor are connected to each other by the fourth clutch, whereby an increase in the rotational speed of the second motor can be suppressed. And thereby, the intensity | strength requested | required of a rotor can be made low also about a said 2nd motor similarly to the said 1st motor. Moreover, the loss in the second motor and the switching loss in the drive circuit of the second motor can be reduced. Furthermore, since the back electromotive force generated by the rotation of the second electric motor can be reduced, the motor torque constant of the second electric motor can be increased to reduce the energization amount. The drive circuit can be downsized and the copper loss of the second electric motor can be reduced.

Further, the rotation element number switching means connects the first motor connecting element and the first motor by the first clutch, and the first motor connecting element and the first motor by the second clutch. From the one-collinear four-element operation state in which the connection is released, the connection between the first motor connecting element and the first motor is released by the first clutch, and adjacent to the first motor by the second clutch. switching to 1 collinear 3 elements operating state in which the element and the first electric motor is connected, the rotational speed of the first motor connecting element, characterized in the row of TURMERIC when a predetermined speed or more .

  According to the present invention, when the rotational speed of the first motor connecting element becomes equal to or higher than the predetermined speed by the rotation element number switching means, the first collinear line is caused by the first clutch and the second clutch. By switching from the four-element operation state to the one-collinear three-element operation state, the rotation speed of the first motor is reduced to the rotation speed of the adjacent element of the first motor, and the rotation speed of the first motor is changed to the predetermined speed. It is possible to suppress the rise beyond the range.

  An embodiment of the present invention will be described with reference to FIGS.

  [First Embodiment] First, the first embodiment will be described with reference to FIGS.

  FIG. 1 is a configuration diagram of a power unit 1a according to a first embodiment of the present invention. Referring to FIG. 1, a power unit 1a drives left and right drive wheels 2 and 2 (corresponding to a driven part of the present invention) of a vehicle (not shown), and is an engine 3 (a power source). The first planetary gear mechanism 20 and the second planetary gear mechanism 30 for transmitting power between the first generator motor 40, the second generator motor 50, and the drive wheels 2 and 2; And a differential gear mechanism 9.

  In addition, the power unit 1a transmits power between a first PDU (Power Drive Unit) 61 that is a drive circuit of the first generator motor 40, a second PDU 62 that is a drive circuit of the second generator motor 50, the first PDU 61, and the second PDU 62. A battery 63 that performs transmission and reception and an ECU (Electric Control Unit) 65 that controls the operation of the power unit 1a are provided.

  The ECU 65 is an electronic unit composed of a microcomputer or the like. When the microcomputer executes a predetermined control program, the ECU 65 functions as the rotating element number switching means of the present invention.

  In the first embodiment, the second generator motor 50 corresponds to the first motor of the present invention, and the first generator motor 40 corresponds to the second motor of the present invention. The second planetary gear mechanism 30 corresponds to the mechanical actuator of the present invention, and the first planetary gear mechanism 20 and the first generator motor 40 constitute the energy distribution / synthesis apparatus of the present invention. The second planetary gear mechanism 30, the first planetary gear mechanism 20, and the first generator motor 40 constitute a differential device in which four rotating elements are arranged on the alignment chart of the present invention.

  The output shaft 3a of the engine 3 is connected to a first main shaft 4 that is rotatably supported by a bearing 4a. Further, the connecting shaft 6 and the second main shaft 7 are disposed concentrically with the first main shaft 4, and the idler shaft 8 is disposed in parallel with the first main shaft 4. The second main shaft 7 is rotatably supported by a bearing 7a, and the idler shaft 8 is rotatably supported by a bearing 8a.

  The connecting shaft 6 is hollow and the first main shaft 4 is rotatably fitted inside. The idler shaft 8 is integrally provided with a first gear 8b and a second gear 8c. The first gear 8b meshes with a gear 7b provided integrally with the connecting shaft 6, and the second gear 8c is a differential gear. It meshes with the gear 9a of the mechanism 9.

  The differential gear mechanism 9 is connected to the drive wheels 2 and 2 via the drive shafts 10 and 10. With the above configuration, the second main shaft 7 is connected to the drive wheels 2 and 2 via the idler shaft 8 and the differential gear mechanism 9. Hereinafter, the circumferential direction of the first main shaft 4, the connecting shaft 6, and the second main shaft 7 is simply referred to as “circumferential direction”, and the axial direction is simply referred to as “axial direction”.

  The first planetary gear mechanism 20 is of a single pinion type, and includes a sun gear 21 (corresponding to the third element of the present invention) and a ring gear 22 rotatably provided on the outer periphery of the sun gear 21 (the first gear of the present invention). Corresponding to the elements), a plurality of (for example, three) planetary gears 23 (only two are shown) meshing with both the gears 21 and 22, and a carrier 24 that rotatably supports the planetary gears 23 (second element of the present invention). Corresponding to). The sun gear 21 is concentrically provided integrally with the connecting shaft 6 (corresponding to the first connecting portion of the present invention). The carrier 24 is concentrically provided integrally with the first main shaft 4 (corresponding to the second connecting portion of the present invention).

  The first planetary gear mechanism 20 combines the function of distributing the power input to the carrier 24 to the sun gear 21 and the ring gear 22 and the power input to the sun gear 21 and the ring gear 22 and outputs the resultant power to the carrier 24. It has a function. Further, when such power distribution / combination is performed, the sun gear 21, the ring gear 22, and the carrier 24 rotate while maintaining a linear speed relationship.

  The configuration of the second planetary gear mechanism 30 is the same as that of the first planetary gear mechanism 20, and a sun gear 31 (corresponding to the fourth element of the present invention) and a ring gear 32 (corresponding to the sixth element of the present invention). And a plurality of (for example, three) planetary gears 33 (only two are shown) meshing with both gears 31 and 32, and a carrier (corresponding to the fifth element of the present invention) that rotatably supports the planetary gears 33. Have. The sun gear 31 is provided concentrically and integrally with the first main shaft 4, and the carrier 34 is provided concentrically and integrally with the connecting shaft 6.

  The second planetary gear mechanism 30 has a function of distributing and synthesizing power, like the first planetary gear mechanism 20 described above.

  With the above configuration, the carrier 24 of the first planetary gear mechanism 20, the sun gear 31 of the second planetary gear mechanism 30, and the output shaft 3 a of the engine 3 change torque and rotational speed via the first main shaft 4. They are mechanically connected directly to each other without a speed change mechanism such as a simple gear. The ring gear 22 of the first planetary gear mechanism 20 and the carrier 34 of the second planetary gear mechanism 30 are mechanically directly connected to each other via the connecting shaft 6. The carrier 34 of the second planetary gear mechanism 30 and the drive wheels 2 and 2 are mechanically connected to each other via the idler shaft 8 and the differential gear mechanism 9. That is, the ring gear 22 of the first planetary gear mechanism 20 and the carrier 34 of the second planetary gear mechanism 30 are coupled to the drive wheels 2 and 2.

  The first motor generator 40 is a three-phase DC brushless motor, and is provided integrally with the first planetary gear mechanism 20. The first motor generator 40 includes a stator 41 composed of 3n armatures 41 a and a rotor 42 arranged corresponding to the stator 41. Each armature 41a includes an iron core 41b and a coil 41c wound around the armature 41a. The armature 41a is fixed to a case (not shown) and is arranged at substantially equal intervals in the circumferential direction.

  The 3n coils 41c constitute n sets of three-phase (U-phase, V-phase, W-phase) coils. The armature 41a is connected to the battery 63 and the ECU 65 via the first PDU 61. The first PDU 61 is a motor drive circuit configured by an inverter or the like, and the battery 63 is configured to be able to be charged and discharged via the first PDU 61.

  The rotor 42 of the first motor generator 40 has 2n permanent magnets 42a arranged at substantially equal intervals in the circumferential direction, and the polarities of two adjacent permanent magnets 42a are different from each other. Each permanent magnet 42a is attached to a ring-shaped fixing portion 42b made of a soft magnetic material (for example, iron). The fixed portion 42 b is rotatable integrally with the sun gear 21 of the first planetary gear mechanism 20.

  With the above configuration, in the first motor generator 40, a rotating magnetic field is generated in the stator 41 by the driving power supplied from the first PDU 61 to the armature 41 a of the stator 41, and the rotor 42 rotates. That is, the electric power supplied to the stator 41 is converted into motive power and output to the rotor 42. Further, when the driving power is not supplied from the first PDU 61 to the stator 41, when the rotor 42 rotates, a rotating magnetic field is generated in the stator 41 due to regeneration. That is, the first motor generator 40 operates as a generator, and the power input to the rotor 42 is converted into electric power by the stator 41 and recovered by the battery 63.

  The ECU 65 controls the operation of the first PDU 61 to control the electric power supplied to the first motor generator 40, the electric power generated by the first motor generator 40, and the rotational speed of the rotor 42.

  Next, the second motor generator 50 is a three-phase DC brushless motor similar to the first motor generator 40 described above. The second motor generator 50 is connected to the second planetary gear mechanism 30 via the first clutch 55 and the second clutch 56. Connected. The second motor generator 50 includes a stator 51 and a rotor 52. Since the configurations of the stator 51 and the rotor 52 are the same as those of the stator 41 and the rotor 42 of the first motor generator 40, description thereof is omitted here.

  The stator 51 of the second motor generator 50 is fixed to a case (not shown) and connected to the battery 63 and the ECU 65 via the second PDU 62. The second PDU 62 is a motor drive circuit configured by an inverter or the like, and the battery 63 is configured to be charged and discharged via the second PDU 62.

  The first clutch 55 is connected to the rotor 52 of the second motor generator 50 and the ring gear 32 of the second planetary gear mechanism 30 according to a control signal output from the ECU 65, and released to release the connection. Switch to state. When the first clutch 55 is in the engaged state, the rotor 52 of the second motor generator 50 and the ring gear 32 of the second planetary gear mechanism 30 are rotated together.

  Further, the second clutch 56 is connected to the rotor 52 of the second motor generator 50 and the second carrier 34 of the second planetary gear mechanism 30 in accordance with a control signal output from the ECU 65, and this connection. Switch to the released state to release. When the second clutch 56 is in the engaged state, the rotor 52 of the second motor generator 50 and the carrier 34 of the second planetary gear mechanism 30 are rotated together.

  Therefore, by setting the first clutch 55 to the engaged state and the second clutch 56 to the released state, the power unit 1a can be set to the one-collinear four-element operating state. That is, the power device 1a is a ring gear 32 of the second planetary gear mechanism 30 connected to the second motor generator 50 (corresponding to the first rotating element, the second rotating element, or the first motor connecting element of the present invention), The carrier 34 of the second planetary gear mechanism 30 connected to the drive wheels 2 and 2 and the ring gear 22 of the first planetary gear mechanism 20 (corresponding to the second rotating element or the third rotating element of the present invention, the first motor adjacent element). ), The carrier 24 of the first planetary gear mechanism 20 connected to the engine 3, the sun gear 31 of the second planetary gear mechanism 30 (corresponding to the second rotating element or the third rotating element of the present invention), and the first motor generator The first planetary gear mechanism 20 connected to the machine 40 can be operated as a power unit having four rotating elements, which are the sun gear 21 (corresponding to the first rotating element or the fourth rotating element of the present invention).

  On the other hand, by setting the first clutch 55 in the disengaged state and the second clutch 56 in the engaged state, the power unit 1b can be brought into the one-collinear three-element operating state. That is, the power unit 1 a is connected to the carrier 34 of the second planetary gear mechanism 30 connected to the rotor 52 and the drive wheels 2 and 2 of the second motor generator 50, the ring gear 22 of the first planetary gear mechanism 20, and the engine 3. Power having three rotating elements, that is, the sun gear 31 of the second planetary gear mechanism 30 and the carrier 24 of the first planetary gear mechanism 20 and the sun gear 21 of the first planetary gear mechanism 20 connected to the first motor generator 40. It can be operated as a device.

  With the above configuration, in the second motor generator 50, the rotating magnetic field is generated in the stator 51 by the driving power supplied from the second PDU 62 to the stator 51, and the rotor 52 rotates. That is, the electric power supplied to the stator 51 is converted into motive power and output to the rotor 52. Further, when the driving power is not supplied from the second PDU 62 to the stator 51 and the rotor 52 rotates, a rotating magnetic field is generated in the stator 51 due to regeneration. That is, the second motor generator 50 operates as a generator, and the power input to the rotor 52 is converted into electric power by the stator 51 and recovered by the battery 63.

  The ECU 65 controls the operation of the second PDU 62 to control the power supplied to the second motor generator 50, the power generated by the second motor generator 50, and the rotation speed of the second rotor 52. To do.

  Next, referring to FIGS. 2A to 3B, the ECU 65 causes the first clutch 55 and the second clutch 56 described above to operate in the one-collinear four-element operating state and the one-collinear three-element operating state. The effect when switching is performed will be described. 2 (a) to 3 (b) show the rotational speed MG2 of the second motor generator 50 (= the rotational speed of the ring gear 32 of the second planetary gear mechanism 30 (one collinear four-element operating state), or the second The rotational speed of the carrier 34 of the planetary gear mechanism 30 (one collinear three-element operating state) and the rotational speed ENG of the engine 3 (= the carrier 24 of the first planetary gear mechanism 20 and the sun gear 31 of the second planetary gear mechanism 30). Rotation speed), the rotation speed of the drive wheels 2 and 2 (= the rotation speed of the ring gear 22 of the first planetary gear mechanism 20 and the carrier 34 of the second planetary gear mechanism 30), and the rotation speed MG1 of the first motor generator 40. It is a speed diagram with (= rotational speed of the sun gear 21 of the 1st planetary gear mechanism 20).

  2 (a) and 2 (b) show that the power unit 1a shown in FIG. 1 is in a 1-collinear 4-element operating state (the first clutch 55 is ON (engaged state) and the second clutch 56 is OFF (released state). )). In this case, the ECU 65 controls the rotational speed MG1 of the first motor generator 40 and the rotational speed MG2 of the second motor generator 50 to drive the engine 3 with respect to the rotational speed ENG. The rotation speed OUT of the wheels 2 and 2 can be changed steplessly.

  FIG. 2A shows the time when the vehicle starts, and FIG. 2B shows the time when the vehicle travels at a low speed. When the vehicle starts and travels at a low speed, it is necessary to generate a relatively large torque on the drive wheels 2, 2. Therefore, the rotational speed MG 1 of the first motor generator 40 is changed to the rotational speed MG 2 of the second motor generator 50. The LOW gear ratio is set so that the rotational speed OUT of the drive wheels 2 and 2 is lower than the rotational speed ENG of the engine 3.

  As the vehicle shifts from the low speed running state to the high speed running state, the ECU 65 causes the first motor generator to set the HIGH gear ratio so that the rotational speed OUT of the drive wheels 2 and 2 is higher than the rotational speed ENG of the engine 3. The rotational speed MG1 of 40 and the rotational speed MG2 of the rotational speed MG2 of the second motor generator 50 are controlled. At this time, the rotational speed MG2 of the second motor generator 50 increases beyond the rotational speed ENG of the engine 3. However, when the second generator motor 50 rotates at a high speed, the loss of the second motor generator 50 increases. Bad effects occur.

  Therefore, as shown in FIG. 3A, the ECU 65 releases the first clutch 55 and sets the second clutch 55 when the rotational speed MG2 of the second motor generator 50 reaches the rotational speed ENG of the engine 3. With the clutch 56 engaged, the power unit 1a is switched from the one-collinear four-element operating state to the one-collinear three-element state.

  Thus, when the rotational speed MG2 of the second motor generator 50 reaches the rotational speed ENG of the engine 3, the power unit 1a is switched from the one-collinear four-element operating state to the one-collinear three-element operating state, The shock that occurs when the second clutch 56 is switched from the released state to the engaged state can be reduced.

  Note that the power unit 1a is changed from the one-collinear four-element operating state to the one-collinear three-element operating state regardless of the condition that the rotational speed MG2 of the second motor generator 50 reaches the rotational speed ENG of the engine 3. Even in the case of switching, the effect of the present invention can be obtained.

  Further, when the rotational speed MG2 of the second generator motor 50 becomes equal to or higher than a predetermined speed, the power unit 1a may be switched from the one-collinear four-element operating state to the one-collinear three-element operating state.

  Then, when the vehicle is traveling at a high speed, the rotational speed MG2 of the second motor generator 50 is set to be equal to that of the drive wheels 2 and 2 as shown in FIG. As the rotation speed OUT, an increase in the rotation speed MG2 of the second motor generator 50 can be suppressed.

  [Second Embodiment] Next, a second embodiment will be described with reference to FIGS.

  FIG. 4 is a configuration diagram of a power unit 1b according to the second embodiment. The power unit 1b includes a first motor generator 40 and a first planetary gear mechanism 20 of the power unit 1a of the first embodiment described above, and a third motor generator 70 (corresponding to the energy distribution / synthesis device of the present invention). The components similar to those of the power unit 1a are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 4, the third electric motor 70 includes a first rotor 71 (corresponding to a first element of the present invention) and a stator 72 (in the present invention) arranged to face the first rotor 71. And a second rotor 73 (corresponding to the second element of the present invention) provided with a gap between the first rotor 71 and the stator 72.

  Referring to FIG. 5, the first rotor 71 has 2n permanent magnets 71a, and the permanent magnets 71a are arranged on the outer peripheral surface of the ring-shaped fixing portion 71b in a state of being arranged at equal intervals in the circumferential direction. It is attached. Each permanent magnet 71a has a substantially fan-shaped cross section perpendicular to the axial direction. The fixed portion 71 b is made of a soft magnetic material (for example, iron), and an inner peripheral surface thereof is integrally attached to the connecting shaft 6. With the above configuration, the first rotor 71 is rotatable integrally with the connecting shaft 6.

  FIG. 6 is a schematic development of a part of a cross-section broken along the circumferential direction at the position of the AA line in FIG. 5. As shown in FIG. 6, the central angle formed by the two permanent magnets 71a adjacent to each other in the circumferential direction around the connecting shaft 6 is a predetermined angle θ. The polarities of the permanent magnets 71a are different from each other in the circumferential direction. Hereinafter, the left magnetic pole in the drawing of the permanent magnet 71a is referred to as a “first magnetic pole”, and the right magnetic pole in the drawing is referred to as a “second magnetic pole”.

  The stator 72 of the third electric motor 70 generates a rotating magnetic field, and has 3n armatures 72a arranged at equal intervals in the circumferential direction. Each armature 72a includes an iron core 72b and a coil 72c wound around the iron core 72b. The iron core 72b is substantially fan-shaped in cross section perpendicular to the axial direction, and has substantially the same length as the permanent magnet 71a in the axial direction.

  A groove 72d extending in the circumferential direction is formed at the central portion in the axial direction of the inner peripheral surface of the iron core 72b. The 3n coils 72c constitute n sets of three-phase (U-phase, V-phase, W-phase) coils. The armature 72a is attached to the case CA through a ring-shaped fixing portion 72e so as not to move. From the number and arrangement of the armatures 72a and permanent magnets 71a as described above, when the center of one armature 72a coincides with the center of the permanent magnet 71a in the circumferential direction, every two armatures 72a are arranged with respect to the armature 72a. The center of the armature 72a and the center of the permanent magnet 71a coincide with each other in the circumferential direction.

  Further, the armature 72a is connected to the battery 63 and the ECU 65 via the first PDU 61. Further, the armature 72a is configured such that different magnetic poles are generated at the left and right ends of the iron core 72b when power is supplied from the PDU 61 and when it is in a power generation state. As these magnetic poles are generated, the first and second portions between the left side (first magnetic pole side) portion and the right side (second magnetic pole side) portion of the first rotor 71 are generated. Are generated such that the rotating magnetic field of the rotation rotates in the circumferential direction. Hereinafter, the magnetic pole generated at the left end of the iron core 72b is referred to as "first armature magnetic pole", and the magnetic pole generated at the right end is referred to as "second armature magnetic pole". The number of “first armature magnetic poles” and “second armature magnetic poles” is 2n, which is the same as the number of magnetic poles of the permanent magnet 71a.

  The second rotor 73 has a plurality of first cores 73a and second cores 73b. The first core 73a and the second core 73b are both arranged at equal intervals in the circumferential direction, and the number of the first core 73a and the second core 73b is set to 2n, which is the same as that of the permanent magnet 71a. . Each of the first cores 73a is a soft magnetic material (for example, a laminate of a plurality of steel plates), and the cross section orthogonal to the axial direction is substantially fan-shaped, and is approximately half the length of the permanent magnet 71a in the axial direction. It extends in the length. Each of the second cores 73b is a soft magnetic material like the first core 73a, and has a substantially fan-shaped cross section orthogonal to the axial direction, and extends in the axial direction with a length approximately half that of the permanent magnet 71a. ing.

  Further, in the axial direction, the first core 73a is disposed between the left side (first magnetic pole side) portion of the first rotor 71 and the left side (first armature magnetic pole side) portion of the stator 72, and the second The core 73b is disposed between the first rotor 71 and the portion on the right side (second armature magnetic pole side). Further, the second cores 73b are alternately arranged in the circumferential direction with respect to the first cores 73a, and the centers thereof are shifted from the center of the first cores 73a by ½ of the predetermined angle θ described above. Yes.

  Referring to FIG. 5, the first core 73a and the second core 73b are attached to the outer ends of the flanges 73d via rod-like connecting portions 73c extending in the axial direction. The flange 73 d is provided concentrically with the first main shaft 4. With this configuration, the second rotor 73 having the first core 73 a and the second core 73 b is rotatable integrally with the first main shaft 4, and the output shaft 3 a of the engine 3 (see FIG. 4).

  In the third electric motor 70 having the above configuration, as shown in FIG. 6, when the first and second rotating magnetic fields are generated, the polarities of the first armature magnetic poles face each other (closest). When different from the magnetism of each first magnetic pole, the polarity of each second armature magnetic pole is the same as the polarity of each second magnetic pole opposite (closest). When each first core 73a is positioned between each first magnetic pole and each first armature magnetic pole, each second core 73b is generating two sets of rotating magnetic fields adjacent in the circumferential direction. When the magnetism of each second armature magnetic pole is different from the magnetism of each second magnetic pole facing (closest), the magnetism of each first armature magnetic pole is the same as that of each first magnetic pole facing (closest). It becomes the same as magnetism. Further, when each second core 73b is positioned between each second magnetic pole and each second armature magnetic pole, each first core 73a has two sets of first armature magnetic poles adjacent in the circumferential direction. And between the first magnetic poles.

  The third electric motor 70 has the same function as a planetary gear mechanism that inputs and outputs rotational power with the first rotor 71 and the second rotor 73 and inputs and outputs electric power with the stator 72. Therefore, the same function as that of the configuration of the first motor generator 40 and the first planetary gear mechanism 20 in the first embodiment described above can be realized by replacing the third motor 70. Then, in the power unit 1b, by controlling the engaged state / release state of the first clutch 55 and the second clutch 56, as in the power unit 1a of the first embodiment described above, FIG. The operation shown in 3 (b) can be realized.

  [Third Embodiment] Next, a third embodiment will be described with reference to FIGS.

  FIG. 4 is a configuration diagram of a power unit 1c according to the third embodiment. The power unit 1c is provided with the first clutch 55 and the second clutch 56 that are provided for the second motor generator 50 of the power unit 1a of the first embodiment described above on the first motor generator 40 side. It is a thing. In addition, about the structure similar to the power plant 1a of 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  In the third embodiment, the first generator motor 40 corresponds to the first motor of the present invention, and the second generator motor 50 corresponds to the second motor of the present invention. The first planetary gear mechanism 20 corresponds to a mechanical differential device of the present invention, and the second planetary gear mechanism 30 and the second generator motor 50 constitute an energy distribution / synthesis device of the present invention. The first planetary gear mechanism 20, the second planetary gear mechanism 30, and the second generator motor 50 constitute a differential device in which four rotating elements are arranged on the collinear diagram of the present invention.

  The sun gear 31 of the second planetary gear mechanism 30 corresponds to the first element of the present invention, the carrier 34 corresponds to the second element of the present invention, and the ring gear 32 corresponds to the third element of the present invention. . The ring gear 22 of the first planetary gear mechanism 20 corresponds to the fourth element of the present invention, the carrier 24 corresponds to the fifth element of the present invention, and the sun gear 21 corresponds to the sixth element of the present invention. .

  The first clutch 45 is connected to the rotor 42 of the first motor generator 40 and the sun gear 21 of the first planetary gear mechanism 20 according to a control signal output from the ECU 65, and released to release this connection. Switch to state. When the first clutch 45 is in the engaged state, the rotor 42 of the first motor generator 40 and the sun gear 21 of the first planetary gear mechanism 20 are rotated together.

  Further, the second clutch 46 is connected to the rotor 42 of the first motor generator 40 and the carrier 24 of the first planetary gear mechanism 20 in accordance with a control signal output from the ECU 65, and the connection is released. Switch to the released state. When the second clutch is in the engaged state, the rotor 42 of the first motor generator 40 and the carrier 24 of the first planetary gear mechanism 20 are rotated together.

  Therefore, by setting the first clutch 45 in the disengaged state and the second clutch 46 in the engaged state, the power unit 1c can be brought into the 1-collinear 4-element operation state. That is, the power unit 1c is connected to the ring gear 32 (corresponding to the first rotating element or the second rotating element of the present invention) and the drive wheels 2 and 2 of the second planetary gear mechanism 30 connected to the second motor generator 40. The carrier 34 of the connected second planetary gear mechanism 30, the ring gear 22 (the second rotating element or the third rotating element of the present invention) of the first planetary gear mechanism 20, and the first planetary gear mechanism 20 connected to the engine 3. The first planetary gear connected to the carrier 24 and the sun gear 31 of the second planetary gear mechanism 30 (corresponding to the second rotating element or the third rotating element of the present invention, the first motor adjacent element) and the first generator motor 40. The mechanism 20 can be operated as a power unit having four rotating elements, which are the sun gear 21 of the mechanism 20 (corresponding to the first rotating element, the fourth rotating element, and the first motor connecting element of the present invention).

  On the other hand, by setting the first clutch 45 in the disengaged state and the second clutch 46 in the engaged state, the power unit 1c can be brought into the one-collinear three-element operating state. That is, the power unit 1c is connected to the carrier 24 of the first planetary gear mechanism 20 connected to the first motor generator 40 and the engine 3, the ring gear 22 of the first planetary gear mechanism 20 connected to the drive wheels 2 and 2, and the second gear. The two planetary gear mechanisms 30 can be operated as a power unit having three rotating elements, that is, the carrier 34 and the ring gear 32 of the second planetary gear mechanism 30 connected to the second motor generator 50.

  Next, referring to FIGS. 8A to 9B, the ECU 65 causes the first clutch 45 and the second clutch 46 described above to operate in the one-collinear four-element operating state and the one-collinear three-element operating state. The effect when switching is performed will be described. 8 (a) to 9 (b) show the rotational speed MG1 of the first motor generator 40 (= the rotational speed of the sun gear 21 of the first planetary gear mechanism 20 (during one collinear four-element operation), or the first The rotational speed of the carrier 24 of the planetary gear mechanism 20 and the sun gear 31 of the second planetary gear mechanism 30 (when one collinear three-element operation is performed), and the rotational speed ENG of the engine 3 (= the carrier 24 of the first planetary gear mechanism 20 and The rotational speed of the sun gear 31 of the second planetary gear mechanism 30) and the rotational speed OUT of the drive wheels 2 and 2 (= the rotational speed of the ring gear 22 of the first planetary gear mechanism 20 and the carrier 34 of the second planetary gear mechanism 30). FIG. 6 is a velocity diagram with the rotational speed MG2 of the second motor generator 50 (= the rotational speed of the ring gear 32 of the second planetary gear mechanism 30).

  FIG. 8A shows the time when the vehicle is starting, and FIG. 8B shows the time when the vehicle is traveling at a low speed. When starting the vehicle and traveling at a low speed, the ECU 65 puts the first clutch 45 in the released state and puts the second clutch 46 in the engaged state, and puts the power unit 1c into the one-collinear three-element operating state. As a result, the rotational speed MG1 of the first motor generator 40 can be suppressed from increasing with the rotational speed of the first motor generator 40 as the rotational speed ENG of the engine 3.

  Thus, by suppressing the increase in the rotational speed MG1 of the first motor generator 40, it is possible to suppress adverse effects such as an increase in loss of the first motor generator 40 due to high rotation.

  Further, the ECU 65 releases the second clutch 46 when the rotational speed MG1 of the first motor generator 40 reaches the rotational speed OUT of the drive wheels 2 and 2, as shown in FIG. At the same time, the first clutch 45 is set to the engaged state, and the power unit 1c is switched from the one-collinear three-element operating state to the one-collinear four-element operating state.

  Thus, when the rotational speed MG1 of the first motor generator 40 reaches the rotational speed OUT of the drive wheels 2 and 2, the power unit 1c is switched from the 1-collinear 3-element operating state to the 1-collinear 4-element operating state. As a result, the shock that occurs when the first clutch 45 is switched from the released state to the engaged state can be reduced.

  The power unit 1c is changed from the 1-collinear 3-element operating state to the 1-collinear 4-element operating state regardless of the condition that the rotational speed MG2 of the second motor generator 50 reaches the rotational speed ENG of the engine 3. Even in the case of switching, the effect of the present invention can be obtained.

  Further, when the rotational speed MG1 of the first generator motor 40 becomes equal to or higher than a predetermined speed, the power unit 1c may be switched from the one-collinear four-element operating state to the one-collinear three-element operating state.

  Then, as shown in FIG. 9B, the high gear setting in which the rotational speed OUT of the drive wheels 2 and 2 is higher than the rotational speed ENG of the engine 3 by setting the one-collinear four-element operation state. In this case, the output torque of the second motor generator 50 can be made lower than the one-collinear three-element operation state.

  [Fourth Embodiment] Next, a fourth embodiment will be described with reference to FIG.

  FIG. 10 is a configuration diagram of a power unit 1d according to the fourth embodiment. The power unit 1d uses the second motor generator 50 and the second planetary gear mechanism 30 of the power unit 1c of the third embodiment described above as a fourth motor 80 (corresponding to the energy distribution / combination device of the present invention). The same configuration as that of the power unit 1d is given with the same reference numerals, and the description thereof is omitted.

  The fourth electric motor 80 includes a first rotor 81, a stator 82 disposed so as to face the first rotor 81, and a second rotor 83 provided with a gap between the first rotor 81 and the stator 82. ing.

  The configuration of the fourth electric motor 80 is the same as that of the third electric motor 70 of the power unit 1b of the second embodiment described above. The third electric motor 80 inputs and outputs rotational power using the first rotor 81 and the second rotor 83. In addition, the stator 82 has the same function as the planetary gear mechanism that inputs and outputs power. Therefore, the same function as the configuration of the combination of the second motor generator 50 and the second planetary gear mechanism 30 in the third embodiment described above can be realized by replacing the third motor 80.

  In this case, the first rotor 81 of the third electric motor 80 corresponds to the first element of the present invention, the second rotor 83 corresponds to the second element of the present invention, and the stator 82 corresponds to the third element of the present invention. It corresponds to. Then, in the power unit 1d, by controlling the engaged / released state of the first clutch 45 and the second clutch 46, as in the power unit 1c of the third embodiment described above, FIG. The operation shown in 9 (b) can be realized.

  [Fifth Embodiment] Next, a fifth embodiment will be described with reference to FIG.

  FIG. 11 is a configuration diagram of a power unit 1e according to the fifth embodiment. The power unit 1e is different from the first motor generator 40 of the power unit 1a of the first embodiment described above in the same manner as the power unit 1c of the third embodiment. It is provided.

  In this case, any one of the first clutch 45 and the second clutch 46 and the first clutch 55 and the second clutch 56 corresponds to the first clutch and the second clutch of the present invention, and the other is the present invention. This corresponds to the third clutch and the fourth clutch.

  When the second generator motor 50 is the first motor of the present invention, the ring gear 32 of the second planetary gear mechanism 30 is the first motor connecting element of the present invention, and the carrier 34 of the second planetary gear mechanism 30 is the main motor 34. It becomes the 1st electric motor adjacent element of invention. The first generator motor 40 is the second motor of the present invention, the sun gear 21 of the first planetary gear mechanism 20 is the second motor connecting element of the present invention, and the carrier 24 of the first planetary gear mechanism 20 is the main motor 24. It becomes the 2nd electric motor adjacent element of invention.

  Conversely, when the first generator motor 40 is the first motor of the present invention, the sun gear 21 of the first planetary gear mechanism 20 serves as the first motor connecting element of the present invention and the carrier 24 of the first planetary gear mechanism 20. Is the first motor adjacent element of the present invention. The second generator motor 50 is the second motor of the present invention, the ring gear 32 of the second planetary gear mechanism 30 is the second motor connecting element of the present invention, and the carrier 34 of the second planetary gear mechanism 30 is It becomes the 2nd electric motor adjacent element of this invention.

  The ECU 65 puts the first clutch 45 provided for the first motor generator 40 in the engaged state, puts the second clutch 46 in the released state, and sets the first clutch 45 provided for the second motor generator 50. By setting the first clutch 55 to the engaged state and the second clutch 56 to the released state, the power unit 1e is connected to the 1 shown in FIGS. 2 (a), 2 (b) and 9 (b). A collinear four-element operating state can be achieved.

  Further, the ECU 65 puts the first clutch 55 provided for the second motor generator 50 into a released state, puts the second clutch 56 into a fastened state, and is provided for the first motor generator 40. By setting the first clutch 45 to the engaged state and the second clutch 46 to the released state, the power unit 1e can be set to the one-collinear three-element operating state shown in FIG. it can. And thereby, the raise of the rotation speed of the 2nd motor generator 50 at the time of high speed driving | running | working can be suppressed.

  In addition, the ECU 65 puts the first clutch 45 provided for the first motor generator 40 into the released state, puts the second clutch 46 into the engaged state, and is provided for the second motor generator 50. The first clutch 55 is set to the engaged state and the second clutch 56 is set to the released state, so that the power unit 1e is connected to the one collinear three elements shown in FIGS. 8 (a) and 8 (b). It can be in an operating state. Thus, it is possible to suppress an increase in the rotational speed of the first motor generator 40 at the time of starting and running at a low speed.

  In addition, this invention can be implemented in various aspects, without being limited to the said 1st-5th embodiment. For example, in the first to fifth embodiments, the first planetary gear mechanism 20 and the second planetary gear mechanism 30 are used as the mechanical differential device of the present invention. Other suitable devices may be used.

  That is, it has three rotating elements arranged on a collinear diagram, a function of distributing power input to one of the three rotating elements to the other two rotating elements, and the two Any device having a function of combining the power input to the rotating elements and then outputting the combined power to the one rotating element may be used. For example, instead of the gear of the planetary gear mechanism, a device having a plurality of rotors that transmit power by friction between surfaces and having a function equivalent to that of the planetary gear mechanism may be used.

  In the first to fifth embodiments, the first motor generator 40 and the second motor generator 50 are DC brushless motors, but the function of converting the input power into power and the input power are Other devices such as an AC motor may be used as long as the device has a function of converting to electric power.

  In the third electric motor 70 of the second embodiment and the third electric motor 80 of the fourth embodiment, the second rotors 73 and 83 disposed between the stators 72 and 82 and the first rotors 71 and 81 are Although two rows of cores (first core 73a and second core 73b) are provided, three or more rows of cores may be provided. In this case, assuming that the number of core rows is N, the phase shift between adjacent magnetic poles in the first rotor is 360 ° / N, and the phase shift between adjacent cores in the second rotor is 360 ° / N. What is necessary is just to comprise a 1st rotor and a 2nd rotor as 2N.

The block diagram of the power plant of the 1st Embodiment of this invention. FIG. 2 is a velocity diagram explaining the operation of the power plant shown in FIG. 1. FIG. 2 is a velocity diagram explaining the operation of the power plant shown in FIG. 1. The block diagram of the power plant of the 2nd Embodiment of this invention. The block diagram of the 3rd electric motor shown in FIG. The block diagram of the 3rd electric motor shown in FIG. The block diagram of the power plant of the 3rd Embodiment of this invention. The speed diagram explaining the action | operation of the power plant shown in FIG. The speed diagram explaining the action | operation of the power plant shown in FIG. The block diagram of the power plant of the 4th Embodiment of this invention. The block diagram of the power plant of the 5th Embodiment of this invention. The block diagram of the conventional power plant.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1a-1e ... (invention) power unit, 2 ... drive wheel, 3 ... engine (prime mover), 4 ... 1st main shaft (1st connection part), 6 ... connection shaft (2nd connection part), 20 ... 1st 1 planetary gear mechanism, 21 ... sun gear, 22 ... ring gear, 23 ... planetary gear, 24 ... carrier, 30 ... second planetary gear mechanism, 31 ... sun gear, 32 ... ring gear, 33 ... planetary gear, 34 ... carrier, 40 ... first motor , 41 ... Stator, 42 ... Rotor, 45 ... First clutch, 46 ... Second clutch, 50 ... Second motor, 51 ... Stator, 52 ... Rotor, 55 ... First clutch, 56 ... Second clutch, 61 ... First 1 PDU, 62 ... second PDU, 63 ... battery, 65 ... ECU, 70 ... third electric motor, 71 ... first rotor, 72 ... stator, 73 ... second rotor, 80 ... third electric motor, 81 ... first rotor, 8 ... The stator, 83 ... the second rotor

Claims (6)

A differential device in which four rotating elements are arranged on a nomograph;
A prime mover coupled to one of the second and third rotating elements disposed inside the collinear diagram of the rotating elements, and a driven unit coupled to the other;
A first electric motor provided for any one of the first rotating element and the fourth rotating element disposed outside in the collinear diagram of the rotating elements;
Of the first rotating element and the fourth rotating element, the first motor connecting element, which is a rotating element provided with the first motor, and the first motor are connected, and the connection is released. A first clutch for switching between
A state in which the first motor is connected to the first motor connecting element of the second rotating element and the third rotating element, the first motor adjacent element being a rotating element adjacent on the collinear diagram, and the first motor. And a second clutch that switches between the disengaged state ,
1 collinear line 4 in which the first motor connecting element and the first motor are connected by the first clutch, and the connection between the first motor adjacent element and the first motor is released by the second clutch. Element operating state;
1 collinear line 3 in which the connection between the first motor connecting element and the first motor is released by the first clutch, and the first motor adjacent element and the first motor are connected by the second clutch. Switching to the element operating state
A power plant comprising: a rotation element number switching means that performs when a difference between a rotation speed of the first motor connecting element and a rotation speed of the first motor adjacent element is a predetermined value or less . The power plant according to claim 1, wherein
The rotating element number switching means is
1 collinear line 4 in which the first motor connecting element and the first motor are connected by the first clutch, and the connection between the first motor connecting element and the first motor is released by the second clutch. From the element operating state,
1 collinear line 3 in which the connection between the first motor connecting element and the first motor is released by the first clutch, and the first motor adjacent element and the first motor are connected by the second clutch. Switching to the element operating state
The power unit, which is performed when a rotation speed of the first motor connecting element is equal to or higher than a predetermined speed . The power plant according to claim 1 or 2,
The differential device includes first, second, and third elements arranged on a collinear diagram, and energy input to the second element is input to the first and third elements. An energy distributing / synthesizing device having a function of distributing, and a function of combining the energy input to the first and third elements and outputting the combined energy to the second element;
A mechanical differential having fourth, fifth and sixth elements arranged in a collinear diagram;
A first connecting portion that mechanically connects the first element and the fifth element;
A second connecting portion for mechanically connecting the second element and the fourth element;
The first rotating element corresponds to one of the third element and the sixth element, and the fourth rotating element corresponds to the other,
The second rotating element includes the first element and the fifth element connected by the first connecting part, and the second element and the fourth element connected by the second connecting part. And the third rotation element corresponds to the other,
The power device, wherein the first motor is provided for the sixth element, and the sixth element serves as the first motor connecting element . The power plant according to claim 3 , wherein
The energy distribution / synthesis device includes a stator for generating a rotating magnetic field;
A first rotor composed of a magnet and provided to face the stator;
A second rotor made of a soft magnetic material and provided between the stator and the first rotor is individually assigned to the first element, the second element, and the third element. Have
Energy is input / output between the stator, the first rotor, and the second rotor via a magnetic circuit formed along with the generation of the rotating magnetic field, and the energy is input / output. The power device is configured to rotate the rotating magnetic field, the first rotor, and the second rotor . The power plant according to claim 3 , wherein
The energy distribution / synthesis device includes a mechanical differential device having the first element, the second element, and the third element, and a second electric motor coupled to the third element. A power plant characterized by that. The power plant according to any one of claims 1 to 5,
The first electric motor is provided for one of the first rotating element and the fourth rotating element, and the second electric motor is provided for the other,
Of the first rotating element and the fourth rotating element, the second motor connecting element, which is a rotating element provided with the second motor, and the second motor are connected, and the connection is released. A third clutch for switching between
Of the second rotating element and the third rotating element, the second motor connecting element and the second motor adjacent element which is a rotating element adjacent on the collinear diagram are connected to the second motor. A power device comprising: a fourth clutch that switches between a state and a state in which the connection is released .

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