JP2017015141A - Drive unit for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive unit for a vehicle which can generate power by using the other rotating electric machine when one rotating electric machine functions as a drive force source of wheels, and can use the two rotating electric machines as the drive force sources of the wheels at both forward traveling and reverse traveling.SOLUTION: A drive unit 1 for a vehicle comprises: an input member IN which is drive-connected to an internal combustion engine EG; an output member OUT which is drive-connected to wheels W; a first rotating electric machine MG1; a second rotating electric machine MG2; a first transmission mechanism 10 which drive-connects the output member OUT and the first rotating electric machine MG1; a second transmission mechanism 20 which drive-connects the output member OUT and the second rotating electric machine MG2; a third transmission mechanism 30 which drive-connects the input member IN and the first rotating electric machine MG1; and an engagement device 3 which selectively drive-connects the first rotating electric machine MG1 to either of the first transmission mechanism 10 and the third transmission mechanism 30.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle drive device.

  Japanese Patent Laying-Open No. 2013-141872 (Patent Document 1) discloses a vehicle drive device including an internal combustion engine (ENG), a rotating electrical machine for driving a vehicle (MOT), and a rotating electrical machine for generating electricity (GEN) ( 10) is disclosed (Patent Document 1: FIG. 1 and the like). The internal combustion engine (ENG) and the rotating electric machine for power generation (GEN) can be switched between a disconnected state and a connected state by a clutch (CL). Further, the rotating electrical machine for driving the vehicle (MOT) and the rotating electrical machine for power generation (GEN) are arranged on the same axis, and can be switched between a shut-off body and a connected state by a one-way clutch (1WAY). It is. The one-way clutch (1WAY) is engaged when the rotating electric machine for power generation (GEN) rotates in the forward direction, which will be described later, relative to the rotating electric machine for driving the vehicle (MOT). Here, the “forward direction” is a rotation direction when the rotating electric machine (MOT) for driving the vehicle powers to advance the vehicle. When the rotating electrical machine for power generation (GEN) rotates in the opposite direction relative to the rotating electrical machine for driving (MOT), the one-way clutch (1WAY) is disengaged. The power of the internal combustion engine (ENG) is transmitted so that the rotating electrical machine for power generation (GEN) rotates in the reverse direction with respect to the “forward direction” described above, and the rotating electrical machine for power generation (GEN) generates electric power by this power. I do. The generated electric power is stored in a DC power source or used as driving power for a rotating electrical machine (MOT) for driving a vehicle.

  The vehicle drive device (10) stops the internal combustion engine (ENG) and releases the clutch (CL). For example, the vehicle drive device (10) uses, for example, a 1-motor EV (Vehicle-driven rotating electrical machine (MOT) as a driving force source) Electric vehicle) traveling and two-motor EV traveling using a rotating electric machine (MOT) for driving a vehicle and a rotating electric machine (GEN) for power generation as driving force sources are possible. In addition, while the internal combustion engine (ENG) is operated and the clutch (CL) is engaged, the power generation rotating electrical machine (GEN) is regeneratively operated to generate power, and the electric power is used to generate the vehicle driving rotating electrical machine (MOT). Series hybrid running with power running is also possible.

  By the way, in this vehicle drive device (10), when the vehicle is moved backward, the rotating electrical machine (MOT) for driving the vehicle is operated in the reverse direction. Even if the rotating electric machine (GEN) for power generation is driven in the reverse direction, the one-way clutch (1WAY) is not engaged, so that the two-motor EV traveling cannot be performed during reverse travel. Since a large driving force cannot be produced during reverse travel, the rotating electric machine (MOT) for driving the vehicle is required to have specifications that ensure the driving force required for reverse climbing and the like. MOT) is prevented from being downsized. Also, a large driving force is required when the vehicle traveling speed is low, such as when starting. For example, the gear ratio of the rotating electrical machine for power generation (GEN) with respect to the output shaft to the wheel is made lower than that of the rotating electrical machine for driving the vehicle (MOT), so that the wheel is driven by the rotating electrical machine (GEN) during forward travel. The power can be increased. That is, it is possible to reduce the size of both rotating electric machines by giving the rotating electric machine (GEN) for power generation necessary for the two-motor traveling by setting the gear ratio. However, as in the vehicle drive device (10) of Patent Document 1, the vehicle drive rotating electrical machine (MOT) to the wheel and the power generation rotating electrical machine (GEN) to the wheel have the same path. It is difficult to make the gear ratio different from the rotating electrical machine for driving the vehicle (MOT) to the wheel and from the rotating electrical machine for power generation (GEN) to the wheel.

JP 2013-141872 A

  In view of the above background, when one rotating electrical machine functions as a wheel driving force source, power generation by the other rotating electrical machine is possible. A vehicle drive device that can be a source is desired.

  As one aspect, a vehicle drive device in view of the above includes an input member drivingly connected to an internal combustion engine, an output member drivingly connected to a wheel, a first rotating electrical machine, a second rotating electrical machine, and the output. A first transmission mechanism for drivingly connecting a member and the first rotating electrical machine, a second transmission mechanism for drivingly connecting the output member and the second rotating electrical machine, and driving the input member and the first rotating electrical machine A third transmission mechanism to be coupled; and an engagement device that selectively drives and couples the first rotating electrical machine to one of the first transmission mechanism and the third transmission mechanism.

  According to this configuration, the power transmission path from the first rotating electrical machine to the output member and the power transmission path from the second rotating electrical machine to the output member are separate paths. Therefore, in this configuration, the first rotating electrical machine can select the power transmission path independently of the second rotating electrical machine. For this reason, the first rotating electrical machine can be caused to generate electric power while the second rotating electrical machine functions as a driving force source of the wheels by drivingly connecting the first rotating electrical machine and the third transmission mechanism by the engagement device. it can. Further, by drivingly connecting the first rotating electrical machine and the first transmission mechanism with the engagement device, the torque of the first rotating electrical machine can be transmitted to the output member in addition to the torque of the second rotating electrical machine. That is, according to this configuration, when one rotating electrical machine (here, the second rotating electrical machine) functions as a driving force source for the wheels, the other rotating electrical machine (here, the first rotating electrical machine) can generate power. Thus, it is possible to provide a vehicle drive device that can use two rotating electric machines as a driving force source for wheels both during forward travel and during reverse travel.

  Further, since the power transmission path from the first rotating electrical machine to the output member and the power transmission path from the second rotating electrical machine to the output member are separate paths, the gear ratio from the first rotating electrical machine to the output member, The gear ratio from the rotating electrical machine to the output member can be set to a different value. For this reason, when using two rotary electric machines as a driving force source of a vehicle, the rotary electric machines of different specifications can be used. For example, one rotating electrical machine can be optimized to output torque in a partial speed range within a speed range required for the vehicle. For example, the first rotating electrical machine can be of a specification that can output such that additional driving force can be applied when the vehicle speed is low, and the rotating electrical machine can be downsized. Further, the second rotating electrical machine that is the other rotating electrical machine can add the driving force of another rotating electrical machine as necessary, as described above. Therefore, the second rotating electrical machine can be optimized to operate with maximum efficiency in a wide speed range necessary for the vehicle without being particular about outputting torque in a speed range where torque is insufficient. For example, the second rotating electrical machine can be configured to suppress torque at a low speed and operate with high efficiency in a wide speed range. When the path from each of the two rotating electric machines to the wheels is the same path as in the vehicle drive device of Patent Document 1, it is difficult to drive-connect with the output member at such a different gear ratio. Therefore, it is difficult to vary the specifications of the rotating electrical machine in this way.

  For example, in general, in order to perform series hybrid traveling in a hybrid vehicle, the first rotating electrical machine for power generation is required to have an output equivalent to the second rotating electrical machine for driving the vehicle. However, in limited series hybrid travel (for example, series hybrid travel with a range extender function that extends the cruising range when the capacity of the DC power supply is small), the output of the first rotating electrical machine may be smaller than that of the second rotating electrical machine. Good. As described above, when the first rotary electric machine to the wheel and the second rotary electric machine to the wheel are different paths, the rotary electric machine in a form (physique etc.) corresponding to the output and specifications required for each is adopted. This improves the mountability.

  Further features and advantages of the vehicle drive device will become clear from the following description of embodiments described with reference to the drawings.

Skeleton diagram of vehicle drive system Schematic layout of the vehicle drive unit as seen from the direction along the rotation axis Schematic system configuration diagram of vehicle drive device The figure which shows an example of the relationship between the speed and driving force of a vehicle, and driving modes

  Hereinafter, embodiments of a vehicle drive device will be described with reference to the drawings. As shown in the skeleton diagram of FIG. 1, the vehicle drive device 1 includes an input member IN that is drivingly connected to the internal combustion engine EG, an output member OUT that is drivingly connected to the wheels W, a first rotating electrical machine MG1, A two-rotary electric machine MG2. In the present embodiment, the output member OUT is drivingly connected to the wheel W via an output differential gear mechanism 50 described later. The output member OUT and the first rotating electrical machine MG1 are drivingly connected via the first transmission mechanism 10, and the output member OUT and the second rotating electrical machine MG2 are drive connected via the second transmission mechanism 20, The input member IN and the first rotating electrical machine MG1 are drivingly connected via the third transmission mechanism 30. Further, the vehicle drive device 1 includes an engagement device (dog clutch 3) that selectively connects the first rotating electrical machine MG1 to either the first transmission mechanism 10 or the third transmission mechanism 30.

  In the following description, “drive coupling” means a state in which two rotating elements are coupled so as to be able to transmit a driving force (synonymous with torque). This concept includes a state in which the two rotating elements are connected so as to rotate integrally, and a state in which the driving force is transmitted through one or more transmission members. Such transmission members include various members (shafts, gear mechanisms, belts, etc.) that transmit rotation at the same speed or at different speeds, and engaging devices (frictions) that selectively transmit rotation and driving force. Engagement devices, meshing engagement devices, etc.).

  FIG. 2 is a schematic layout view of the vehicle drive device 1 as viewed from the direction along the rotation axis (for example, X1 or X2). As shown in FIG. 2, the first rotating electrical machine MG1 and the second rotating electrical machine MG2 are disposed so that the rotational axes (X1 and X2) are different (separate shaft layout). Further, the first rotating electrical machine MG1 is shorter in the axial direction than the second rotating electrical machine MG2, and is disposed so as not to interfere with the side member 90 of the vehicle as shown in FIG. In FIG. 2, the lower side indicates the ground side, and the side member 90 is disposed upward in the drawing (disposed on the side far from the ground). As shown in FIG. 2, the rotating shaft X1 of the first rotating electrical machine MG1 is disposed above the rotating shaft X2 of the second rotating electrical machine MG2, and the upper end portion of the first rotating electrical machine MG1 is the second rotating electrical machine. It is arranged above the upper end of MG2.

  As shown in FIG. 3, the first rotating electrical machine MG <b> 1 and the second rotating electrical machine MG <b> 2 are electrically connected to a common DC power source 9. The DC power supply 9 is, for example, a secondary battery such as nickel metal hydride or lithium ion, a capacitor such as an electric double layer capacitor, or a combination of these, and is a DC power supply capable of storing a large voltage and a large capacity. The first rotating electrical machine MG1 and the second rotating electrical machine MG2 fulfill the functions of a motor (electric motor), a generator (generator), and if necessary, a motor and a generator. The first rotating electrical machine MG1 and the second rotating electrical machine MG2 are both AC rotating electrical machines. The first rotating electrical machine MG1 is connected to the DC power source 9 via a first inverter 81 that converts electric power between DC and AC. The second rotating electrical machine MG2 is connected to the DC power source 9 via a second inverter 82 that converts electric power between DC and AC. The first inverter 81 and the second inverter 82 are included in the rotating electrical machine drive device 8. In the rotating electrical machine drive device 8, the DC power of the DC power source 9 is boosted and supplied to the inverter (81, 82), or the DC power output from the inverter (81, 82) is stepped down and supplied to the DC power source 9. Or a converter that performs the processing may be included.

  As described above, the first rotating electrical machine MG1 and the second rotating electrical machine MG2 can fulfill both functions of a motor and a generator as needed, but the first rotating electrical machine MG1 mainly functions as a generator, The second rotating electrical machine MG2 mainly functions as a motor. In the present embodiment, the second rotating electrical machine MG2 is a main driving force source of the vehicle, the first rotating electrical machine MG1 is a secondary driving force source that assists the driving force of the second rotating electrical machine MG2, and the second This is an energy source that generates electric power for driving the rotating electrical machine MG2. The internal combustion engine EG is a power source that provides power for the first rotating electrical machine MG1 to generate electric power. The vehicle has a 1-motor EV (Electric Vehicle) travel mode in which the wheels W are rotated by the driving force of the second rotating electrical machine MG2, and a 2-motor that rotates the wheels W by the driving forces of the second rotating electrical machine MG2 and the first rotating electrical machine MG1. The vehicle can travel in the EV traveling mode and in the series hybrid traveling mode in which the internal combustion engine EG is driven and the first rotating electrical machine MG1 generates power and the wheels W are rotated by the driving force of the second rotating electrical machine MG2.

  The 1-motor EV travel mode and the 2-motor EV travel mode can be implemented when the amount of power stored in the DC power supply 9 is sufficient. Further, it is possible to apply a larger driving force to the wheels W in the two-motor EV traveling mode compared to the one-motor EV traveling mode. FIG. 4 schematically shows an example of the relationship between the vehicle speed, the driving force of the wheels W by the vehicle drive device 1 and the travel mode. In FIG. 4, a region indicated by “R2” indicates a region in the 1-motor EV traveling mode in which the second rotating electrical machine MG2 is the driving force source of the wheels W. In this region, naturally, the second rotating electrical machine MG2 outputs all the driving force. In FIG. 4, in the region where “R1” and “R2” are combined, the first rotating electrical machine MG1 outputs the driving force of the wheels W in addition to the second rotating electrical machine MG2.

  The region indicated by “R1” is an operation region that is expanded when the first rotating electrical machine MG1 also outputs the driving force of the wheels W. That is, the first rotating electrical machine MG1 functions as a driving force source (motor) in an operation region where the vehicle travels at a low speed and requires high driving force (for example, at the time of starting or after acceleration after starting). On the other hand, the second rotating electrical machine MG2 functions as a driving force source (motor) in the entire speed range of the vehicle, as indicated by “R2”. However, when a high driving force is required in the low speed region, an assist torque is applied by the first rotating electrical machine MG1, so that the upper limit of the driving force can be suppressed to a relatively low value. Therefore, the second rotating electrical machine G2 can be set to a specification that can cope with a wide speed range with high efficiency. Although details will be described later, in the present embodiment, when both the two rotating electric machines are used as the driving force source of the vehicle, the rotating electric machines having different specifications can be used.

  By the way, the cruising distance of the electric vehicle depends on the capacity (storage amount) of the DC power source 9 that is an energy source of the second rotating electrical machine MG2 that is a driving force source. However, in the present embodiment, even if the remaining amount of power stored in the DC power supply 9 is small, if there is fuel (gasoline, light oil, LPG, etc.) that operates the internal combustion engine EG, the traveling can be continued. . Further, even when both the amount of stored electricity and the remaining amount of fuel are small, it is possible to continue traveling quickly by supplying fuel that can be replenished in a relatively short time.

  Hereinafter, the detailed structure and function of the vehicle drive device 1 of the present embodiment will be described. As described above, the vehicle drive device 1 includes the first rotating electrical machine MG1, the second rotating electrical machine MG2, and the internal combustion engine EG as power sources. Among these, the first rotating electrical machine MG1 and the second rotating electrical machine MG2 are the driving force sources of the wheels W. The first rotating electrical machine MG1 is drivingly connected to the output member OUT via the first transmission mechanism 10, and the second rotating electrical machine MG2 is drivingly connected to the output member OUT via the second transmission mechanism 20.

  In the present embodiment, the second transmission mechanism 20 includes at least a second rotating electrical machine output gear 21 connected to the rotation shaft X2 of the second rotating electrical machine MG2. In the present embodiment, the second rotating electrical machine output gear 21 always transmits driving force to the rotating shaft X2 of the second rotating electrical machine MG2 and the output member OUT (a first counter gear 41 of the counter gear mechanism 40 described later). So that it is drive coupled. In the present embodiment, the first transmission mechanism 10 includes at least a sleeve gear 12 having a cylindrical portion through which the rotation axis X1 of the first rotating electrical machine MG1 penetrates radially inward. Unlike the second transmission mechanism 20, the first transmission mechanism 10 (sleeve gear 12) is drivingly connected to the output member OUT (first counter gear 41) so as to always transmit the driving force. The rotary shaft X1 of the first rotating electrical machine MG1 is not always drive-coupled so as to transmit the driving force. The first transmission mechanism 10 (sleeve gear 12) and the rotating shaft X1 of the first rotating electrical machine MG1 (the first rotating electrical machine input / output member 11 that is drivingly connected to the rotating shaft X1) transmit driving force according to conditions. It is connected to drive.

  As shown in FIG. 1, the first transmission mechanism 10 (sleeve gear 12) is connected to the first rotating electrical machine MG1 via a one-way clutch 5 (one-way engagement device) or a dog clutch 3 (meshing engagement device). Drive-coupled to the rotation axis X1. Specifically, the sleeve gear 12 is connected to the second rotating element 5 b of the one-way clutch 5 and is connected to the first engaging element 3 a of the dog clutch 3. The first rotating element 5a of the one-way clutch 5 and the second engaging element 3b of the dog clutch 3 are connected to the rotation shaft X1 of the first rotating electrical machine MG1. In the present embodiment, the second engagement element 3b of the dog clutch 3 is coupled to the first rotating electrical machine input / output member 11 coupled to the rotation shaft X1 of the first rotating electrical machine MG1.

  When the one-way clutch 5 is engaged, that is, when the first rotating element 5a and the second rotating element 5b are engaged and rotate together, the first transmission mechanism 10 (sleeve) is connected via the one-way clutch 5. The gear 12) and the rotating shaft X1 of the first rotating electrical machine MG1 are connected. In addition, when the first engagement element 3a and the second engagement element 3b of the dog clutch 3 are engaged and synchronously rotated by the sleeve 3s of the dog clutch 3, the first transmission mechanism 10 (sleeve) is connected via the dog clutch 3. The gear 12) and the rotating shaft X1 of the first rotating electrical machine MG1 are connected.

  In the one-way clutch 5 provided between the first rotating electrical machine MG1 and the first transmission mechanism 10, the rotational speed of the rotating element (first rotating element 5a) on the first rotating electrical machine MG1 side is the same as that of the first transmission mechanism 10. Engage when the rotational speed of the side rotational element (second rotational element 5b) is higher than the rotational speed. For example, in a state where the second rotating electrical machine MG2 rotates in the forward direction (the direction in which the vehicle moves forward), the first rotating electrical machine MG1 stops, rotates in the direction opposite to the forward direction, Even so, the one-way clutch 5 is not engaged when rotating at a lower rotational speed than the second rotating electrical machine MG2. In the present embodiment, this “forward direction” is defined as “first rotation direction”, and “reverse direction” is defined as “second rotation direction”. That is, when the first rotating electrical machine MG1 rotates in the forward direction (first rotating direction) at a higher rotational speed than the second rotating electrical machine MG2, the one-way clutch 5 is engaged, and the output member OUT is connected to the first rotating electrical machine. The combined torque of MG1 and second rotating electrical machine MG2 can be transmitted.

  As is apparent from the function of the one-way clutch 5, it is preferable that the one-way clutch 5 is in a released state in the series hybrid travel mode in which the first rotating electrical machine MG1 generates power. Although details will be described later, the rotation direction when the first rotating electrical machine MG1 generates power is the reverse direction (second rotation direction) described above. The first rotating electrical machine MG1 is drivingly connected to the input member IN via the third transmission mechanism 30 when generating power. An internal combustion engine EN is drivingly connected to the input member IN, and the first rotating electrical machine MG1 converts mechanical energy output from the internal combustion engine EN into electrical energy (generates power).

  In the present embodiment, the third transmission mechanism 30 includes gear mechanisms (31 to 33) that are drivingly connected to the internal combustion engine EN. As shown in FIG. 1, in this embodiment, the gear mechanism includes an input shaft first gear 31, an input shaft second gear 32, and an input shaft in order of the power transmission path from the input member IN to the first rotating electrical machine MG1. A third gear 33 is included. The input shaft first gear 31 is drivingly connected to the input member IN so as to always transmit the driving force, and rotates in the same direction as the input member IN. In this example, the input shaft first gear 31 is connected to the input member IN via a damper DP. The input shaft second gear 32 is provided so as to mesh with both the input shaft first gear 31 and the input shaft third gear 33. In the form illustrated in FIG. 1, the input shaft second gear 32 is rotatably supported with respect to the counter shaft X4 of the counter gear mechanism 40. The input shaft second gear 32 rotates in the opposite direction with respect to the input member IN, and the input shaft third gear 33 rotates in the same direction as the input member IN. The input shaft third gear 33 is drivingly connected to the rotary shaft X1 (first rotary electric machine input / output member 11) of the first rotary electric machine MG1 via the dog clutch 3. In this example, the input shaft third gear 33 is coupled to the third engagement element 3 c of the dog clutch 3. When the rotary shaft X1 (first rotary electrical machine input / output member 11) of the first rotary electrical machine MG1 is connected to the input shaft third gear 33 by the engagement of the dog clutch 3, it rotates in the same direction as the input member IN.

  As described above, the rotation direction when the first rotating electrical machine MG1 generates power is the second rotation direction. The rotation shaft X1 (first rotating electrical machine input / output member 11) of the first rotating electrical machine MG1 and the input shaft third gear 33 are drivingly connected because the first rotating electrical machine MG1 generates power. At this time, the rotation direction of the input shaft third gear 33 is the second direction. Therefore, when the first rotating electrical machine MG1 generates electric power, the input member IN is rotated in the second direction by the power from the internal combustion engine EG.

  As described above, the second engagement element 3b of the dog clutch 3 is coupled to the first rotating electrical machine input / output member 11 (rotating shaft X1). As shown in FIG. 1, the third engagement element 3 c of the dog clutch 3 is coupled to the input shaft third gear 33 (the gear mechanism (31 to 33) of the third transmission mechanism 30). When the third engagement element 3c and the second engagement element 3b of the dog clutch 3 are engaged and integrally rotated by the sleeve 3s of the dog clutch 3, the input shaft third gear 33 and the first rotating electric machine are input via the dog clutch 3. The output member 11 is connected, and the third transmission mechanism 30 (input shaft third gear 33) and the rotation shaft X1 of the first rotating electrical machine MG1 are connected so as to transmit the driving force.

  The dog clutch 3 is a three-position switching type dog clutch. That is, the dog clutch 3 has a first position where the second engagement element 3b and the first engagement element 3a are engaged, and a second position where the second engagement element 3b and the third engagement element 3c are engaged. And a third position where none of the first engagement element 3a, the second engagement element 3b, and the third engagement element 3c are engaged with each other can be selected. That is, the switching position where the sleeve 3s engages both the second engagement element 3b and the first engagement element 3a is the first position, and the sleeve 3s is the second engagement element 3b and the third engagement element 3c. The position where both are engaged is the switching second position, and the switching position where the sleeve 3s engages only with the second engagement element 3b is the third position.

  The dog clutch 3 realizes a first state in which the first rotating electrical machine MG1 and the first transmission mechanism 10 are drive-coupled at the first position, and the first rotating electrical machine MG1 and the third transmission mechanism 30 are coupled at the second position. The second state of driving connection is realized, and the third state of separating the first rotating electrical machine MG1 from both the first transmission mechanism 10 and the third transmission mechanism 30 is realized at the third position. That is, the dog clutch 3 selectively realizes three states of the first state, the second state, and the third state.

  The output member OUT includes a counter gear mechanism 40 having a first counter gear 41 and a second counter gear 42. The first counter gear 41 and the second counter gear 42 are directly connected by a counter shaft X4. As described above, the first counter gear 41 meshes with the second rotating electrical machine output gear 21 and the sleeve gear 12. On the other hand, the second counter gear 42 meshes with the input gear 51 of the output differential gear mechanism 50 that is drivingly connected to the wheels W. The driving force transmitted from the first rotating electrical machine MG1 and the second rotating electrical machine MG2 to the output member OUT (counter gear mechanism 40) is transmitted to the wheels W via the output differential gear mechanism 50.

  As described above, the one-way clutch 5 is disposed on the first rotating electrical machine MG1 side with respect to the sleeve gear 12, and selectively engages at least the sleeve gear 12 and the rotating shaft X1 of the first rotating electrical machine MG1. To do. More specifically, the one-way clutch 5 releases the sleeve gear 12 and the rotary shaft X1 from a state where the sleeve gear 12 and the rotary shaft X1 (first rotary electric machine input / output member 11) of the first rotary electric machine MG1 are engaged. One of the selected states is selectively realized. On the other hand, the dog clutch 3 is disposed on the gear mechanism (31 to 33) side of the third transmission mechanism 30 with respect to the sleeve gear 12, and selectively drives at least the sleeve gear 12 and the gear mechanisms (31 to 33). Link.

  By adopting the configuration described above with reference to FIGS. 1 and 2, the vehicle drive device 1 can provide a dog clutch 3 at an appropriate position to realize a suitable structure. That is, the power transmission path from the first rotating electrical machine MG1 to the output member OUT and the power transmission path from the second rotating electrical machine MG2 to the output member OUT can be different paths. As one combination of the power transmission paths, the first rotary electric machine MG1 and the third transmission mechanism 30 are driven and connected by the dog clutch 3 so that the second rotary electric machine MG2 functions as a driving force source for the wheels W, The rotating electrical machine MG1 can generate power. Further, as another combination of the power transmission paths, the first rotating electrical machine MG1 and the first transmission mechanism 10 are driven and connected by the dog clutch 3 to thereby increase the torque of the first rotating electrical machine MG1 in addition to the torque of the second rotating electrical machine MG2. Can also be transmitted to the output member OUT. That is, when the second rotating electrical machine MG functions as a driving force source for the wheels W, the first rotating electrical machine MG1 can generate electric power, and the two rotating electrical machines are driven by the driving force of the wheels W both during forward and reverse travel. A vehicle drive device 1 that can be used as a power source can be provided.

  Further, since the power transmission path from the first rotating electrical machine MG1 and the second rotating electrical machine MG2 to the output member OUT is a different path, the gear ratio from the first rotating electrical machine MG1 to the output member OUT and the second rotating electrical machine MG2 The gear ratio up to the output member OUT can be set to different values. In the present embodiment, the gear ratio from the sleeve gear 12 to the first counter gear 41 is different from the gear ratio from the second rotating electrical machine output gear 21 to the first counter gear 41. For this reason, when using two rotary electric machines as a driving force source of a vehicle, the rotary electric machines of different specifications can be used.

  As described above with reference to FIG. 4, for example, one rotating electrical machine can be optimized so that torque in a part of the speed range required for the vehicle can be output. For example, the first rotating electrical machine MG1 can be set to a specification that can output such that additional driving force can be applied when the vehicle speed is low, and the first rotating electrical machine MG1 can be downsized. Can do. Further, as described above, the second rotating electrical machine MG2 can add the driving force of the first rotating electrical machine MG1 as necessary. Therefore, the second rotating electrical machine MG2 can be optimized to operate with maximum efficiency in a wide speed range necessary for the vehicle without being particular about outputting torque in a speed range where torque is insufficient. For example, the second rotating electrical machine MG2 can be configured to suppress torque at a low speed and operate with high efficiency in a wide speed range. On the other hand, when the two rotating electrical machines are arranged coaxially, for example, it is difficult to drive-connect with the output member OUT with such different gear ratios. Therefore, it is difficult to use rotating electrical machines with different specifications.

  By the way, the torque of the two rotating electrical machines (MG1, MG2) can be transmitted to the output member OUT by drivingly connecting the first rotating electrical machine MG1 and the first transmission mechanism 10 using the dog clutch 3. However, by providing the one-way clutch 5 as described above, the drive connection between the first rotating electrical machine MG1 and the first transmission mechanism 10 and the connection release can be performed with high responsiveness to a change in speed.

  As one combination of the power transmission paths, the first rotary electric machine MG1 and the first transmission mechanism 10 can be driven and connected by setting the dog clutch 3 to the first state, and as another combination of the power transmission paths, the dog clutch 3 By setting the second state to the second state, the first rotating electrical machine MG1 and the third transmission mechanism 30 can be driven and connected. In the present embodiment, the dog clutch 3 can also be in the third state. In the third state, the first rotating electrical machine MG1 is separated from both the first transmission mechanism 10 and the third transmission mechanism 30. In this state, by engaging the one-way clutch 5, the first rotating electrical machine MG <b> 1 and the first transmission mechanism 10 are drivingly connected, and a power transmission path similar to that when the dog clutch 3 is in the first state is realized. be able to. That is, in the present embodiment, the one-way clutch 5 is provided and the dog clutch 3 can also realize the third state, so that it is possible to quickly move to the two-motor EV travel only by controlling the first rotating electrical machine MG1 without controlling the dog clutch 3. Migration is possible.

  That is, in the third state of the dog clutch 3, the rotational speed of the first rotating electrical machine MG1 in the first rotational direction is controlled to be higher than the rotational speed of the sleeve gear 12 that rotates according to the rotational speed of the wheel W. As a result, the two-motor EV travel mode can be realized with the one-way clutch 5 engaged, and the second rotating machine MG1 has a lower rotational speed in the first rotational direction and is relatively second with respect to the sleeve gear 12. By setting the state to rotate in the rotation direction, the one-way clutch 5 can be disengaged and the 1-motor EV travel mode can be realized. Therefore, the 2-motor EV travel mode and the 1-motor EV travel mode can be switched by controlling the rotational speed of the first rotating electrical machine MG1 without switching the state of the dog clutch 3. In general, the response speed of the rotating electrical machine (first rotating electrical machine MG1) is sufficiently faster than the response speed of the switching operation of the dog clutch 3. Therefore, by providing this one-way clutch 5, the response speed for switching the power transmission state can be increased. Therefore, switching between these two EV modes can be performed quickly and smoothly.

[Other Embodiments]
Hereinafter, other embodiments will be described. Note that the configuration of each embodiment described below is not limited to being applied independently, and can be applied in combination with the configuration of other embodiments as long as no contradiction arises.

(1) In the above description, the dog clutch 3 is exemplified as the engagement device that selectively connects the first rotating electrical machine MG1 to either the first transmission mechanism 10 or the third transmission mechanism 30. However, other methods such as a friction engagement device may be used as the engagement device.

(2) In the above, the vehicle drive device 1 includes an engagement device (dog clutch 3) that selectively drives and connects the first rotating electrical machine MG1 to one of the first transmission mechanism 10 and the third transmission mechanism 30. The embodiment includes the one-way clutch 5 that drives and connects the first rotating electrical machine MG1 to the first transmission mechanism 10 according to conditions. However, this does not impede the configuration in which the one-way clutch 5 is not provided and only the engagement device that selectively drives and connects the first rotating electrical machine MG1 to either the first transmission mechanism 10 or the third transmission mechanism 30 is provided.

(3) In the above, the 1st rotary electric machine MG1 and the 2nd rotary electric machine MG2 illustrated the form arrange | positioned by the axis | shaft from which the rotating shaft (X1, X2) is not on the same line. However, the present invention is not limited to such a structure, and does not hinder the form in which both rotating electrical machines are arranged coaxially.

(4) The configurations of the first transmission mechanism 10, the second transmission mechanism 20, the third transmission mechanism 30, and the like are examples. Therefore, modifications such as using a belt or a chain instead of the gear or changing the number of rotating elements are possible.

  Note that the configurations disclosed in the above-described embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises. Regarding other configurations, the embodiments disclosed herein are merely examples in all respects. Accordingly, various modifications can be made as appropriate without departing from the spirit of the present disclosure.

[Outline of Embodiment]
Hereinafter, the outline | summary of the vehicle drive device (1) demonstrated above is demonstrated easily.

  In one aspect, the vehicle drive device (1) includes an input member (IN) that is drivingly connected to the internal combustion engine (EG), an output member (OUT) that is drivingly connected to the wheels (W), and a first rotation. An electric machine (MG1), a second rotating electric machine (MG2), a first transmission mechanism (10) for drivingly connecting the output member (OUT) and the first rotating electric machine (MG1), and the output member (OUT) And the second rotating electrical machine (MG2) and a second transmission mechanism (20) drivingly connecting the input member (IN) and the first rotating electrical machine (MG1). And an engagement device (3) that selectively drives and connects the first rotating electrical machine (MG1) to one of the first transmission mechanism (10) and the third transmission mechanism (30).

  According to this configuration, the power transmission path from the first rotating electrical machine (MG1) to the output member (OUT) and the power transmission path from the second rotating electrical machine (MG2) to the output member (OUT) are separate paths. . Therefore, in this configuration, the first rotating electrical machine (MG1) can select the power transmission path independently of the second rotating electrical machine (MG2). Therefore, the first rotating electrical machine (MG1) and the third transmission mechanism (30) are drivingly connected by the engagement device (3), so that the second rotating electrical machine (MG2) is used as a driving force source for the wheels (W). The first rotating electrical machine (MG1) can be caused to generate power while functioning. Further, the first rotating electrical machine (MG1) and the first transmission mechanism (10) are driven and connected by the engagement device (3), so that the first rotating electrical machine (MG1) is added to the torque of the second rotating electrical machine (MG2). ) Can also be transmitted to the output member (OUT). That is, according to this configuration, when one rotating electrical machine (here, the second rotating electrical machine (MG2)) functions as a driving force source for the wheels (W), the other rotating electrical machine (here, the first rotating electrical machine (MG1) is used. )) And the vehicle drive device (1) capable of using two rotating electric machines as driving force sources for the wheels (W) both during forward travel and during reverse travel. .

  Further, since the power transmission path from the first rotating electrical machine (MG1) to the output member (OUT) and the power transmission path from the second rotating electrical machine (MG2) to the output member (OUT) are separate paths, the first rotation The gear ratio from the electric machine (MG1) to the output member (OUT) and the gear ratio from the second rotating electric machine (MG2) to the output member (OUT) can be set to different values. For this reason, when using two rotary electric machines as a driving force source of a vehicle, the rotary electric machines of different specifications can be used. For example, one rotating electrical machine can be optimized to output torque in a partial speed range within a speed range required for the vehicle. For example, the first rotating electrical machine (MG1) can have a specification that can output to the extent that an additional driving force can be applied when the vehicle speed is low, and the rotating electrical machine can be downsized. Can do. Further, the second rotating electrical machine (MG2), which is the other rotating electrical machine, can add the driving force of another rotating electrical machine as necessary as described above. Therefore, the second rotating electrical machine (MG2) can be optimized to operate at maximum efficiency in a wide speed range necessary for the vehicle without being particular about outputting torque in a speed range where torque is insufficient. it can. For example, the second rotating electrical machine (MG2) can be configured to operate with high efficiency in a wide speed range while suppressing torque at a low speed. When the path from each of the two rotating electrical machines to the wheel (W) is the same path as in the vehicle drive device of Patent Document 1, the output member (OUT) is drivingly connected in such a different gear ratio. It is difficult. Therefore, it is difficult to vary the specifications of the rotating electrical machine in this way.

  For example, in general, in order to perform series hybrid travel in a hybrid vehicle, the first rotating electrical machine (MG1) for power generation is required to have an output equivalent to the second rotating electrical machine (MG2) for driving the vehicle. However, in limited series hybrid travel (for example, series hybrid travel with a range extender function that extends the cruising range when the capacity of the DC power supply is small), the output of the first rotating electrical machine (MG1) is the second rotating electrical machine (MG2). It may be smaller than As described above, if the path from the first rotating electrical machine (MG1) to the wheel (W) and the path from the second rotating electrical machine (MG2) to the wheel (W) are different paths, the output and specifications required for each are A rotating electric machine with a suitable form (physique, etc.) can be adopted, and the mountability is improved.

  Here, as one aspect, the vehicle drive device (1) preferably includes a one-way engagement device (5) between the first rotating electrical machine (MG1) and the first transmission mechanism (10). It is. Here, in the one-way engagement device (5), the rotational speed of the rotating element (5a) on the first rotating electrical machine (MG1) side is the rotational element (5b) on the first transmission mechanism (10) side. ) Is engaged when the rotational speed is higher.

  As described above, the torque of the two rotating electrical machines (MG1, MG2) is output by drivingly connecting the first rotating electrical machine (MG1) and the first transmission mechanism (10) using the engagement device (3). It can be transmitted to the member (OUT). However, by providing the one-way engagement device (5) as described above, the power of the first rotating electrical machine (MG1) and the first transmission mechanism (10) is controlled by controlling the rotational speed of the first rotating electrical machine (MG1). The transmission state can be switched. In general, the response speed of the rotating electrical machine is faster than the response speed of the switching operation of the engagement device. Therefore, the response speed of switching the power transmission state between the first rotating electrical machine (MG1) and the first transmission mechanism (10) can be increased as compared with the configuration including only the engagement device (3). Therefore, the wheel (W) is rotated by the driving force of the second rotating electrical machine (MG2) and the driving force of both the second rotating electrical machine (MG2) and the first rotating electrical machine (MG1). Switching to the two-motor EV traveling mode in which W) is rotated can be performed quickly and smoothly.

  When the vehicle drive device (1) includes the one-way engagement device (5) as described above, the first rotating electrical machine (MG1) and the third transmission mechanism are engaged by the engagement of the engagement device (3). (30) is connected to the internal combustion engine (EG) and is connected to the internal combustion engine (EG), the rotational direction of the first rotating electrical machine (MG1) is in the released state. It is preferable that the rotation direction.

  As described above, the vehicle drive device (1) is configured such that when one rotating electrical machine (here, the second rotating electrical machine (MG2)) functions as a driving force source for the wheels (W), the other rotating electrical machine (here, Electricity can be generated by the first rotating electrical machine (MG1). In such a situation, the electric power generated by one rotating electric machine (here, the first rotating electric machine (MG1)) is used, and another rotating electric machine (here, the second rotating electric machine (MG2)) is turned to the wheel (W). It is the driving | running | working state which drives. Therefore, in such a traveling state, the one-way engagement device (5) is preferably not in the engaged state but in the released state. The first rotating electrical machine (MG1) generates electric power by converting mechanical energy output from the internal combustion engine (EG) into electric energy. At this time, the first rotating electrical machine (MG1) and the third transmission mechanism (30) are drivingly connected and interlocked with the internal combustion engine (EG). Therefore, the rotation direction of the first rotating electrical machine (MG1) in this state is preferably the rotation direction in which the one-way engagement device (5) is in the released state.

  Moreover, as one aspect, the vehicle drive device (1) includes the one-way engagement device (5) between the first rotating electrical machine (MG1) and the first transmission mechanism (10) as described above. It is preferable that the engagement device (3) is a meshing engagement device and selectively realizes the following three states. That is, the meshing engagement device includes a first state in which the first rotating electrical machine (MG1) and the first transmission mechanism (10) are drivingly connected, and the first rotating electrical machine (MG1) and the third transmission. A second state in which the mechanism (30) is drivingly connected, and a third state in which the first rotating electrical machine (MG1) is separated from both the first transmission mechanism (10) and the third transmission mechanism (30). It is preferable to selectively realize the three states.

  As described above, the engagement device (3) selectively drives and connects the first rotating electrical machine (MG1) to one of the first transmission mechanism (10) and the third transmission mechanism (30). Power generation by the first rotating electrical machine (MG1) and two-motor traveling using the torque of the first rotating electrical machine (MG1) can be realized. Specifically, power generation can be realized by setting the engagement device (3) to the second state, and two-motor travel can be realized by setting the engagement device (3) to the first state. As described above, when the one-way engagement device (5) is used, it is possible to quickly switch between two-motor traveling and one-motor traveling using only the second rotating electrical machine (MG2) as a driving force source. When switching is performed by the one-way engagement device (5), the first rotating electrical machine (MG1) is transferred to the first transmission mechanism (10) and the third transmission mechanism (30) by the engagement device (3). Also, it is preferable that the drive connection is not performed. Since the engagement device (3) can also realize the third state, it is possible to appropriately switch the traveling mode using the one-way engagement device (5).

  Incidentally, since the transmission path from the first rotating electrical machine (MG1) to the output member (OUT) and the power transmission path from the second rotating electrical machine (MG2) to the output member (OUT) are different paths, the first rotation Both rotary electric machines (MG1, MG2) can be arranged in a state where the rotary shaft (X1) of the electric machine (MG1) and the rotary shaft (X2) of the second rotary electric machine (MG2) are not on the same straight line. There are also members such as a frame (for example, side member (90)) for securing strength in the vehicle, but according to the configuration of such a power transmission path, the rotating electrical machine is arranged avoiding interference with them. The degree of freedom increases. Also, by making the axial lengths of the two rotating electrical machines different, for example, it is possible to arrange a control circuit or the like in an empty space because the axial length can be reduced. For example, as one aspect, the first rotating electrical machine (MG1) of the vehicle drive device (1) is shorter in the axial direction than the second rotating electrical machine (MG2), and the first rotating electrical machine (MG1). It is preferable that the rotation shaft (X1) is disposed above the rotation shaft (X2) of the second rotating electrical machine (MG2).

When the vehicle drive device (1) includes the one-way engagement device (5) between the first rotating electrical machine (MG1) and the first transmission mechanism (10), the power transmission path is as follows. By configuring in this way, the engagement device (3) and the one-way engagement device (5) can be provided at appropriate positions, and a suitable structure can be realized. That is, as one aspect, the vehicle drive device (1)
The first transmission mechanism (10) includes a sleeve gear (12) having a cylindrical portion through which a rotation shaft (X1) of the first rotating electrical machine (MG1) penetrates radially inward,
The second transmission mechanism (20) includes a second rotating electrical machine output gear (21) that is drivingly connected to the rotating shaft (X2) of the second rotating electrical machine (MG2);
The third transmission mechanism (30) includes gear mechanisms (31, 32, 33) that are drivingly connected to the internal combustion engine (EG).
The output member (OUT) includes a counter gear mechanism (40) having a first counter gear (41) and a second counter gear (42),
The first counter gear (41) meshes with the second rotating electrical machine output gear (21) and the sleeve gear (12);
The second counter gear (42) meshes with an input gear (51) of an output differential gear mechanism (50) that is drivingly connected to the wheel (W),
The one-way engagement device (5) is disposed on the first rotating electrical machine (MG1) side with respect to the sleeve gear (12), and the sleeve gear (12) and the first rotating electrical machine (MG1). Is selectively engaged with the rotation axis (X1) of
The engagement device (3) is disposed on the gear mechanism (31, 32, 33) side with respect to the sleeve gear (12), and the sleeve gear (12) and the gear mechanism (31, 32, 33) are arranged. 33) is preferably driven and connected.

1: Vehicle drive device 3: Dog clutch (engagement device, meshing engagement device)
5: One-way clutch (one-way engagement device)
5a: Rotating element on the first rotating electrical machine side 5b: Rotating element on the first transmitting mechanism side 10: First transmitting mechanism 12: Sleeve gear 20: Second transmitting mechanism 21: Second rotating electrical machine output gear 30: Third Transmission mechanism 31: input shaft first gear (gear mechanism)
32: Input shaft second gear (gear mechanism)
33: Input shaft third gear (gear mechanism)
40: Counter gear mechanism (output member)
41: first counter gear 42: second counter gear 50: output differential gear mechanism 51: input gear of the output differential gear mechanism IN: input member OUT: output member EG: internal combustion engine MG1: first rotating electrical machine MG2 : Second rotating electrical machine W: wheel X1: rotating shaft X2 of first rotating electrical machine: rotating shaft of second rotating electrical machine

Claims (6)

An input member drivingly connected to the internal combustion engine;
An output member drivingly connected to the wheel;
A first rotating electrical machine;
A second rotating electrical machine;
A first transmission mechanism for drivingly connecting the output member and the first rotating electrical machine;
A second transmission mechanism for drivingly connecting the output member and the second rotating electrical machine;
A third transmission mechanism for drivingly connecting the input member and the first rotating electrical machine;
An engagement device that selectively drives and connects the first rotating electrical machine to one of the first transmission mechanism and the third transmission mechanism.   A one-way engaging device is provided between the first rotating electric machine and the first transmission mechanism, and the one-way engaging device is configured such that the rotational speed of the rotating element on the first rotating electric machine side is the first transmission. The vehicle drive device according to claim 1, wherein the vehicle drive device is engaged when the rotational speed of the rotating element on the mechanism side is higher.   The rotation direction of the first rotating electrical machine in a state in which the first rotating electrical machine and the third transmission mechanism are drivingly connected by the engagement of the engaging device and interlocked with the internal combustion engine is the one-way relationship. The vehicle drive device according to claim 2, wherein the vehicle is in a rotational direction in which the combined device is released.   The engagement device is a meshing engagement device, and a first state in which the first rotating electrical machine and the first transmission mechanism are drivingly connected, and a drive connection between the first rotating electrical machine and the third transmission mechanism. 4 or 3 which selectively realizes the three states of the second state to be performed and the third state in which the first rotating electrical machine is separated from both the first transmission mechanism and the third transmission mechanism. The vehicle drive device described in 1.   5. The first rotating electrical machine has an axial length shorter than that of the second rotating electrical machine, and the rotating shaft of the first rotating electrical machine is disposed above the rotating shaft of the second rotating electrical machine. The vehicle drive device according to any one of the above. The first transmission mechanism includes a sleeve gear having a cylindrical portion through which a rotation shaft of the first rotating electrical machine passes radially inward,
The second transmission mechanism includes a second rotating electrical machine output gear that is drivingly connected to a rotating shaft of the second rotating electrical machine,
The third transmission mechanism includes a gear mechanism that is drivingly connected to the internal combustion engine,
The output member includes a counter gear mechanism having a first counter gear and a second counter gear,
The first counter gear meshes with the second rotating electrical machine output gear and the sleeve gear;
The second counter gear meshes with an input gear of an output differential gear mechanism that is drivingly connected to the wheels,
The one-way engagement device is disposed on the first rotating electrical machine side with respect to the sleeve gear, and selectively engages the sleeve gear and the rotating shaft of the first rotating electrical machine,
The vehicle according to any one of claims 2 to 4, wherein the engagement device is disposed on the gear mechanism side with respect to the sleeve gear and selectively drives and connects the sleeve gear and the gear mechanism. Drive device.

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