JP2020032960A - Vehicle drive device - Google Patents

Abstract

To reduce the size of a vehicle drive device in the axial direction.SOLUTION: In a vehicle drive device 100, when expressing: a first ring gear 12 and a second sun gear 21, which are connected with each other to be integrally rotatable, as a first rotating element T1; a first carrier 14 as a second rotating element T2; a first sun gear 11 and a second carrier 24, which are connected with each other to be integrally rotatable, as a third rotating element T3; and a second ring gear 22 as a fourth rotating element T4, the first rotating element, the second rotating element, the third rotating element and the fourth rotating element T4 are configured such that respective rotation speeds of them satisfy a collinear relationship in which the respective rotation speeds are arranged in this order in a collinear figure. The first rotating element T1 is connected to a first motor 2, the second rotating element T2 is connected to an output member 8 that transmits power to drive wheels, the third rotating element T3 is connected to an internal combustion engine 1, and the fourth rotating element T4 is connected to a second motor 3. A first planetary gear mechanism 10 is located inside a rotor 2r of the first motor 2, and a second planetary gear mechanism 20 is located inside a rotor 3r of the second motor 3.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle drive device.

  2. Description of the Related Art Conventionally, a vehicle drive device including an engine, two planetary gear mechanisms, and two motors has been known (for example, see Patent Document 1). In the device described in Patent Document 1, in the alignment chart in the four-element mode, between the rotating element connected to the engine and the output rotating element, the rotating element connected to the first rotating electric machine or the second rotating electric machine is disposed. One of the connected rotating elements is configured to be located.

International Publication WO2013 / 145193 (Fig. 1)

  However, in the device described in Patent Document 1, using the reference numerals described therein, the output gear (7) is connected to the first carrier (14) and the second sun gear (21), and the rotation shaft of the second rotary electric machine MG2. (32) passes through the inside of the second sun gear 21 and is connected to the second carrier 24. For this reason, in the device described in Patent Document 1, it is difficult to arrange the second planetary gear mechanism (20) inside the rotor of the second rotary electric machine MG2. In particular, in the configuration described in Patent Literature 1, since the second rotary electric machine MG2 is arranged side by side outside the second planetary gear mechanism (20) in the axial direction, there is a problem that the size increases in the axial direction.

  A vehicle driving device according to one embodiment of the present invention includes an internal combustion engine, a first motor, a second motor, a first planetary gear mechanism, a second planetary gear mechanism, and an output member that transmits power to driving wheels. Wherein the first planetary gear mechanism includes a first sun gear, a first ring gear provided on an outer periphery of the first sun gear, a first planetary gear meshing with both the first sun gear and the first ring gear, and a first planetary gear. A first carrier rotatably supported, wherein the second planetary gear mechanism includes a second sun gear, a second ring gear provided on the outer periphery of the second sun gear, and both the second sun gear and the second ring gear. A second planetary gear that meshes with the second planetary gear; and a second carrier that rotatably supports the second planetary gear. The first sun gear and the second carrier are integrally rotatably connected to each other. The first ring gear and the second sun gear are integrally rotatably connected to each other, the first ring gear and the second sun gear connected to each other as a first rotating element, the first carrier as a second rotating element, and a first ring gear and a second sun gear connected to each other. When the first sun gear and the second carrier are used as a third rotating element and the second ring gear is used as a fourth rotating element, the first rotating element, the second rotating element, the third rotating element, and the fourth rotating element rotate respectively. The numbers are arranged so as to satisfy a collinear relationship arranged in this order in the alignment chart, wherein the first rotating element is connected to the first motor, the second rotating element is connected to the output member, and the third rotating element is connected to the third rotating element. The element is connected to the internal combustion engine, the fourth rotating element is connected to the second motor, the first planetary gear mechanism is disposed inside the rotor of the first motor, and the second planetary gear mechanism is connected to the second motor. Of the rotor It is placed in.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle drive device which can achieve size reduction of an axial direction can be provided.

FIG. 1 is a skeleton diagram schematically illustrating an overall configuration of a vehicle drive device according to an embodiment of the present invention. 2 is a table showing an example of an operation mode set by a controller of the vehicle drive device shown in FIG. FIG. 2 is a skeleton diagram showing a flow of torque transmission in a first operation mode of the vehicle drive device in FIG. 1. FIG. 2 is a skeleton diagram showing a flow of torque transmission in a second operation mode of the vehicle drive device in FIG. 1. FIG. 5 is a skeleton diagram showing a flow of torque transmission in a third operation mode of the vehicle drive device in FIG. 1. FIG. 9 is a skeleton diagram showing a flow of torque transmission in a fourth operation mode of the vehicle drive device in FIG. 1. FIG. 9 is a skeleton diagram showing a flow of torque transmission in a fifth operation mode of the vehicle drive device in FIG. 1. FIG. 2 is an alignment chart of the vehicle drive device in FIG. 1 in a first operation mode.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. A vehicle drive device according to an embodiment of the present invention is applied to a hybrid vehicle including an internal combustion engine and a motor generator. FIG. 1 is a skeleton diagram schematically showing an overall configuration of a vehicle drive device 100 according to the present embodiment.

  As shown in FIG. 1, the vehicle drive device 100 includes an engine (ENG) 1, a first motor generator (MG1) 2, a second motor generator (MG2) 3, a first planetary gear mechanism 10, a second It includes a planetary gear mechanism 20 and an output member 8 that transmits power to driving wheels (not shown).

  The engine 1 mixes intake air supplied through a throttle valve with fuel injected from an injector at an appropriate ratio, ignites with an ignition plug or the like, burns the internal combustion engine, thereby generating rotational power. For example, a gasoline engine). Note that various engines such as a diesel engine can be used instead of the gasoline engine. The controller (ECU) 4 controls the opening of the throttle valve, the amount of fuel injected from the injector (injection timing, injection time), the ignition timing, and the like. The output shaft 1a of the engine 1 extends around the axis CL. The output shaft 1a of the engine 1 is provided with a one-way clutch (OWC) 31. The one-way clutch 31 is a mechanism for fixing the output shaft 1a so that the output shaft 1a of the engine 1 rotates only in the output direction, and prevents the output shaft 1a of the engine 1 from rotating in a direction opposite to the output direction. .

  Each of the first and second motor generators 2, 3 has a substantially cylindrical rotor 2r, 3r centered on the axis CL, and a substantially cylindrical stator 2s, 3s disposed around the rotor 2r, 3r. And it can function as a motor and a generator. That is, the rotors 2r and 3r of the first and second motor generators 2 and 3 are driven by power supplied from the battery (BAT) 6 to the coils of the stators 2s and 3s via the power control unit (PCU) 5. At this time, the first and second motor generators 2 and 3 function as electric motors.

  On the other hand, when the rotating shafts 2a, 3a of the rotors 2r, 3r of the first and second motor generators 2, 3 are driven by external force, the first and second motor generators 2, 3 generate electric power, and the power control unit 5 Electric power is stored in the battery 6 via the power supply. At this time, the first and second motor generators 2 and 3 function as generators.

  During normal running, for example, during constant speed running or accelerated running, the first motor generator 2 mainly functions as an electric motor, and the second motor generator 3 mainly functions as a generator. The power control unit 5 includes an inverter. The output torque or regenerative torque of each of first motor generator 2 and second motor generator 3 is controlled by controlling the inverter of power control unit 5 according to a command from controller 4.

  The first motor generator 2 and the second motor generator 3 are arranged coaxially and separated from each other in the axial direction. The first motor generator 2 and the second motor generator 3 are housed in the same case 7, for example. Note that first motor generator 2 and second motor generator 3 may be housed in separate cases.

  A power transmission mechanism 9 is housed in the case 7. The power transmission mechanism 9 according to the present embodiment is a compound planetary gear mechanism having a first planetary gear mechanism 10 and a second planetary gear mechanism 20. The first planetary gear mechanism 10 is arranged inside the rotor 2r of the first motor generator 2, and the second planetary gear mechanism 20 is arranged inside the rotor 3r of the second motor generator 3. The engine 1 may be disposed so as to sandwich the first motor generator 2 with the second motor generator 3 as shown in the drawing, or may be arranged so as to sandwich the second motor generator 3 with the first motor generator 2. You may.

  The first planetary gear mechanism 10 includes a first sun gear 11 that rotates about an axis CL, a first ring gear 12 that is provided on the outer periphery of the first sun gear 11 and rotates about the axis CL, a first sun gear 11 and a first sun gear 11. The first planetary gear 13 is provided between the ring gear 12 and meshes with both the first sun gear 11 and the first ring gear 12. The first carrier 14 rotatably supports the first planetary gear 13. A plurality of first planetary gears 13 are provided in the circumferential direction. The first carrier 14 supports the plurality of first planetary gears 13 so as to be able to rotate and revolve around the axis CL.

  The second planetary gear mechanism 20 includes a second sun gear 21 that rotates about the axis CL, a second ring gear 22 provided around the second sun gear 21 and rotates about the axis CL, a second sun gear 21, and a second sun gear 21. A second planetary gear is provided between the ring gear and meshes with both the second sun gear and the second ring gear, and a second carrier rotatably supports the second planetary gear. A plurality of second planetary gears 23 are provided in the circumferential direction. The second carrier 24 supports the plurality of second planetary gears 23 so as to be able to rotate and revolve around the axis CL.

  The first planetary gear mechanism 10 and the second planetary gear mechanism 20 are connected such that the first sun gear 11 and the second carrier 24 are integrally rotatable with each other, and the first ring gear 12 and the second sun gear 21 are connected so as to be integrally rotatable with each other. Is done.

  First motor generator 2 is connected to first ring gear 12 and second sun gear 21, and second motor generator 3 is connected to second ring gear 22. The engine 1 is connected to the first sun gear 11 and the second carrier 24, and the output member 8 is connected to the first carrier 14.

  The controller (ECU) 4 includes a CPU (Central Processing Unit) as an operation circuit, a ROM (Read Only Memory), a RAM (Random Access Memory), an input / output interface (I / O interface), and a microcontroller including other peripheral circuits. It is composed of a computer. The controller (ECU) 4 can be composed of a plurality of microcomputers. A controller (ECU) 4 controls operations of the engine 1, the first motor generator 2, and the second motor generator 3 according to a traveling state.

  FIG. 2 is a table showing an example of an operation mode set by the controller 4 of the vehicle drive device 100 shown in FIG. As shown in FIG. 2, the controller 4 can set the first to fifth operation modes according to the traveling state. 3A to 3E are skeleton diagrams showing the flow of torque transmission in the first to fifth operation modes of the vehicle drive device 100 in FIG.

  As shown in FIGS. 2 and 3A, the first operation mode is a mode in which first motor generator 2 is in a driving state, second motor generator 3 is in a non-energized state, and engine 1 is in a stopped state. That is, the first operation mode is an electric traveling mode (EV traveling mode) in which the vehicle travels only by the power of the first motor generator 2. The rotation of the first sun gear 11 and the second carrier 24 connected to the output shaft 1a of the engine 1 is prevented by the one-way clutch 31. In the first operation mode, the torque output from first motor generator 2 is transmitted to output member 8 via first ring gear 12 and first carrier 14.

  As shown in FIGS. 2 and 3B, the second operation mode is a mode in which first motor generator 2 is in a driving state, second motor generator 3 is in a driving state, and engine 1 is in a stopped state. That is, the second operation mode is an electric traveling mode (EV traveling mode) in which the vehicle travels with the power of the first motor generator 2 and the second motor generator 3. In the second operation mode, the torque output from first motor generator 2 and second motor generator 3 is transmitted to output member 8 via first ring gear 12 and first carrier 14.

  As shown in FIGS. 2 and 3C, the third operation mode is a mode in which the first motor generator 2 is in a driving state, the second motor generator 3 is in a regenerative state, and the engine 1 is in a driving state. That is, the third operation mode is a hybrid traveling mode (HEV traveling mode) in which the vehicle travels using the power generated by the engine 1 and the power of the first motor generator 2. In the third operation mode, the torque output from the engine 1 is transmitted to the first carrier 14 via the first sun gear 11, and the second carrier 24 (the second carrier that rotates integrally with the first sun gear 11). 24) is also transmitted to the second ring gear 22. The torque output from first motor generator 2 is transmitted to first carrier 14 via first ring gear 12. The torque transmitted to first carrier 14 is transmitted to output member 8, and the torque transmitted to second ring gear 22 is transmitted to rotating shaft 3 a of second motor generator 3. Thereby, the second motor generator 3 is driven to generate power, and the battery 6 is charged.

  As shown in FIGS. 2 and 3D, the fourth operation mode is a mode in which the first motor generator 2 is in a driving state, the second motor generator 3 is in a driving state, and the engine 1 is in a driving state. That is, the fourth operation mode is a hybrid traveling mode (HEV traveling mode) in which the vehicle travels using the power generated by the engine 1 and the power of the first motor generator 2 and the second motor generator 3. In the fourth operation mode, in addition to the torque output from engine 1 and first motor generator 2, the torque output from second motor generator 3 is transmitted to output member 8 via power transmission mechanism 9.

  As shown in FIGS. 2 and 3E, the fifth operation mode is a mode in which first motor generator 2 is in a stopped state, second motor generator 3 is in a non-energized state, and engine 1 is in a driven state. That is, the fifth operation mode is an engine traveling mode (ENG traveling mode) in which the vehicle travels only by the power generated by the engine 1. The rotation of the first ring gear 12 connected to the rotation shaft 2a of the first motor generator 2 is prevented. In the fifth operation mode, the torque output from the engine 1 is transmitted to the output member 8 via the first sun gear 11 and the first carrier 14.

  As described above, the vehicle drive device 100 according to the present embodiment controls the engine 1, the first motor generator 2, and the second motor generator 3 according to the traveling state, and operates in the various operation modes described above. Is done.

  FIG. 4 is an alignment chart of the first driving mode of vehicle drive device 100 shown in FIG. In the alignment chart, the vertical axis represents the rotational speed of each rotary element, and the distance between the vertical axes on the horizontal axis is proportional to the reciprocal of the number of teeth of the sun gear or the ring gear.

  The power transmission mechanism 9 according to the present embodiment has four rotating elements T1, T2, T3, and T4 that rotate differentially with each other. In the power transmission mechanism 9 according to the present embodiment, the first ring gear (R1) 12 and the second sun gear (S2) 21 connected to each other are used as a first rotating element T1, and the first carrier (C1) 14 is used as a second rotating element. T2, the first sun gear (S1) 11 and the second carrier (C2) 24 connected to each other are a third rotating element T3, and the second ring gear (R2) 22 is a fourth rotating element T4. The rotation element T1, the second rotation element T2, the third rotation element T3, and the fourth rotation element T4 are configured such that their respective rotation speeds satisfy a collinear relationship arranged in this order in the alignment chart.

  As shown in FIG. 4, in the vehicle drive device 100 according to the present embodiment, when the four rotating elements T1 to T4 are arranged on the alignment chart, the rotating elements T1, T2, T3, and T4 are linearly arranged in this order. Line up. The first ring gear (R1) 12 and the second sun gear (S2) 21 constituting the first rotating element T1 arranged at one end (right end in the drawing) on the alignment chart have the rotor of the first motor generator (MG1) 2 attached thereto. The rotation shaft 2a of 2r is connected. The rotating shaft 3a of the rotor 3r of the second motor generator (MG2) 3 is connected to the second ring gear (R2) 22 constituting the fourth rotating element T4 disposed at the other end (left end in the drawing) on the alignment chart. Is done. An output member (OUT) 8 is connected to a first carrier (C1) 14 that constitutes a second rotating element T2 disposed on the left of the first rotating element T1. The output shaft 1a of the engine (ENG) 1 is connected to the first sun gear (S1) 11 and the second carrier (C2) 24 that constitute the third rotating element T3 disposed on the right of the fourth rotating element T4. You.

  In the vehicle drive device 100 according to this embodiment, as shown in FIG. 4, the engine (ENG) 1 is connected to the first sun gear (S1) 11, and the output member (OUT) 8 is connected to the first carrier (C1) 14. The first motor generator 2 is connected to the first ring gear (R 1) 12. For this reason, in the vehicle drive device 100 according to the present embodiment, the EV driving is performed as compared with the case where the first motor generator 2 is connected to the first sun gear 11 and the engine 1 is connected to the first ring gear 12. In the mode, the ratio (No / Nm1) of the rotation speed No [rpm] of the output member 8 to the rotation speed Nm1 [rpm] of the first motor generator 2 can be increased.

  That is, according to the present embodiment, when the output member 8 is set to a desired rotation speed, the first motor generator 2 is connected to the first sun gear 11 and the engine 1 is connected to the first ring gear 12. The rotation speed of first motor generator (MG1) 2 can be suppressed lower than in the case.

  Generally, a maximum rotation speed is determined for a motor generator. In the vehicle drive device 100 according to the present embodiment, as described above, the number of revolutions of the first motor generator 2 can be suppressed low in the EV traveling mode, so that a margin can be provided for the maximum number of revolutions. For this reason, a low ratio can be achieved in the power transmission path from the output member 8 to the drive wheels (not shown). Further, in the present embodiment, the foot shaft torque can be obtained by the rotation of the first motor generator 2, so that the torque output by the engine 1 and the second motor generator 3 in the HEV traveling mode can be suppressed low. As a result, the physique of engine 1 and second motor generator 3 can be reduced.

  According to the above-described embodiment, the following operation and effect can be obtained. That is, the vehicle drive device 100 uses the first ring gear 12 and the second sun gear 21 connected to the first motor generator 2 as the first rotating element T1, and uses the first carrier 14 connected to the output member 8 as the second rotating element. T2, the first sun gear 11 and the second carrier 24 connected to the engine 1 are a third rotating element T3, and the second ring gear 22 connected to the second motor generator 3 is a fourth rotating element T4. The first rotating element T1, the second rotating element T2, the third rotating element T3, and the fourth rotating element T4 are configured such that their respective rotational speeds satisfy a collinear relationship arranged in this order in the collinear chart (FIG. 1,4).

  In the present embodiment, the first motor generator 2 is connected to the first ring gear 12, and the first planetary gear mechanism 10 is disposed inside the rotor 2r of the first motor generator 2. Further, the second motor generator 3 is connected to the second ring gear 22, and the second planetary gear mechanism 20 is disposed inside the rotor 3r of the second motor generator 3 (FIG. 1). Therefore, the size of the vehicle drive device 100 in the axial direction can be reduced.

  In the above-described embodiment, the first motor generator 2 that functions as a motor (motor) and a generator (generator) is employed as the first motor, and the motor functions as a motor (motor) and a generator (generator) as the second motor. Although the example in which the second motor generator 3 is adopted has been described, the present invention is not limited to this. For example, a first motor that functions only as an electric motor may be used instead of first motor generator 2, or a second motor that functions only as an electric motor may be used instead of second motor generator 3. .

  The above description is merely an example, and the present invention is not limited to the above embodiment as long as the features of the present invention are not impaired.Other forms that can be considered within the technical idea of the present invention are also described. Included within the scope of the present invention.

Reference Signs List 1 engine, 1a output shaft, 2 first motor generator (first motor), 2a rotary shaft, 2r rotor, 2s stator, 3rd motor generator (second motor), 3a rotary shaft, 3r rotor, 3s stator, 8 Output member, 10 first planetary gear mechanism, 11 first sun gear, 12 first ring gear, 13 first planetary gear, 14 first carrier, 20 second planetary gear mechanism, 21 second sun gear, 22 second ring gear, 23 second Planetary gear, 24 second carrier, 100 vehicle drive device, CL axis, T1 first rotating element, T2 second rotating element, T3 third rotating element, T4 fourth rotating element

Claims (1)

A vehicle drive device including an internal combustion engine, a first motor, a second motor, a first planetary gear mechanism, a second planetary gear mechanism, and an output member that transmits power to driving wheels,
The first planetary gear mechanism includes a first sun gear, a first ring gear provided on an outer periphery of the first sun gear, a first planetary gear meshing with both the first sun gear and the first ring gear, and the first planetary gear. And a first carrier that rotatably supports the
The second planetary gear mechanism includes a second sun gear, a second ring gear provided on an outer periphery of the second sun gear, a second planetary gear meshing with both the second sun gear and the second ring gear, and the second planetary gear. And a second carrier rotatably supporting the
The first sun gear and the second carrier are connected to be integrally rotatable with each other,
The first ring gear and the second sun gear are integrally rotatably connected to each other,
The first ring gear and the second sun gear connected to each other are a first rotation element, the first carrier is a second rotation element, and the first sun gear and the second carrier connected to each other are a third rotation element. When the second ring gear is a fourth rotating element, the first rotating element, the second rotating element, the third rotating element, and the fourth rotating element have respective rotational speeds in the collinear diagram. It is configured to satisfy the collinear relationship arranged in order,
The first rotating element is connected to the first motor,
The second rotating element is connected to the output member,
The third rotating element is connected to the internal combustion engine,
The fourth rotating element is connected to the second motor,
The first planetary gear mechanism is disposed inside a rotor of the first motor,
The vehicle drive device according to claim 1, wherein the second planetary gear mechanism is disposed inside a rotor of the second motor.

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