JP2009120042A - Drive device for hybrid vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive device for a hybrid vehicle capable of reducing loss during an output split mode. <P>SOLUTION: The drive device 2A is composed to carry out switching between an input split mode in a connected state of a second motor generator 8 and an output shaft 6, and the output split mode in a connected state of the second motor generator 8 and a transmission shaft 4. A transmission mechanism 10 is provided, interposed between the second motor generator 8 and the transmission shaft 4 to reduce rotation of the second motor generator 8 and to transmit it to the transmission shaft 4 during the output split mode. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a hybrid vehicle drive device capable of switching between a so-called input split mode and output split mode.

  As is well known, a hybrid vehicle is a vehicle that includes an internal combustion engine as a driving force source for traveling, and also includes an electric motor or a motor / generator as another driving force source for traveling. The hybrid vehicle operates the internal combustion engine in as efficient a manner as possible while compensating for excess or deficiency of the driving force or engine braking force with another driving force source and regenerating energy when the vehicle decelerates or the like. Thus, it is configured to prevent the deterioration of the emission of the internal combustion engine and improve the fuel efficiency.

  As a drive device applied to such a hybrid vehicle, an input split mode includes first and second electric motors in addition to the internal combustion engine, and connects the second electric motor and an output member that outputs power to the drive wheels. And an output split mode for connecting the second electric motor and the internal combustion engine are known (Patent Document 1). In addition, Patent Documents 2 and 3 exist as prior art documents related to the present invention.

Japanese Patent Laid-Open No. 11-332018 JP 2004-336983 A Japanese Patent Laid-Open No. 2004-66898

  Since the drive device of Patent Document 1 operates the second electric motor at the same speed as the rotational speed of the internal combustion engine in the output split mode, the required torque of the second electric motor may increase and loss may increase.

  Therefore, an object of the present invention is to provide a hybrid vehicle drive device that can reduce the loss by reducing the required torque of the second electric motor in the output split mode.

  A drive device for a hybrid vehicle according to the present invention includes a transmission shaft for transmitting power output from an internal combustion engine, a first electric motor, an output member for outputting power to drive wheels, and three rotations capable of differential rotation. And a power distribution mechanism in which the transmission shaft, the first electric motor and the output member are connected to each of these three rotating elements, and a second connected to either the transmission shaft or the output member. Between the input split mode in which the second motor and the output member are connected, and the output split mode in which the second motor and the transmission shaft are connected. In the hybrid vehicle drive apparatus configured to switch the connection state of the two electric motors, the second electric motor is interposed between the second electric motor and the transmission shaft and is in the output split mode. By further comprising a transmission mechanism for transmitting to said transmission shaft by decelerating the rotation, to solve the problems described above (claim 1).

  According to the present invention, the rotation of the second electric motor is decelerated and transmitted to the transmission shaft in the output split mode by the speed change mechanism. Thereby, the required torque of the 2nd electric motor at the time of output split mode can be made small, and loss can be reduced.

  In one aspect of the drive device of the present invention, the speed change mechanism is interposed between the second electric motor and the output member, and reduces the rotation of the second electric motor during the input split mode to output the output. You may be comprised so that it can transmit to a member (Claim 2). According to this aspect, since the speed reduction function in the output split mode and the speed reduction function in the input split mode can be realized by a single speed change mechanism, a drive device that is lightweight, compact, and low in cost and excellent in vehicle mountability can be obtained. Can be provided.

  In one aspect of the driving apparatus of the present invention, the speed change mechanism includes an input rotation element to which the second electric motor is connected, and an output rotation element that rotates differentially with respect to the input rotation element, and the output rotation Switching means for switching between a first state in which an input split mode is realized by connecting an element and the output member, and a second state in which the output split mode is realized by connecting the output rotation element and the transmission shaft (Claim 3). According to this aspect, switching between the input split mode and the output split mode can be easily realized, and efficient power transmission can be performed over a wide gear range.

  In this aspect, there are no particular restrictions on the configuration of the power distribution mechanism and the speed change mechanism. For example, the power distribution mechanism is configured as a planetary gear mechanism having a sun gear, a ring gear and a carrier as the three rotating elements, the transmission shaft is the carrier, the first electric motor is the sun gear, and the output member. May be respectively connected to the ring gear (Claim 4), and the speed change mechanism may be configured to be capable of setting at least two speed ratios (Claim 5). In the former case, the speed change mechanism is configured as a planetary gear mechanism having a sun gear, a ring gear, and a carrier, and includes a brake capable of fixing the ring gear, and the sun gear serves as the input rotation element, and the carrier May be provided as the output rotation elements, respectively. On the other hand, in the latter case, in each of the input split mode and the output split mode, power can be transmitted with at least two gear ratios, so that transmission efficiency can be further improved. The transmission mechanism includes a large-diameter sun gear and a small-diameter sun gear that are adjacent to each other and have different outer diameters, a ring gear that is coaxially disposed on the small-diameter sun gear, the large-diameter sun gear, the small-diameter sun gear, and the ring gear. A long pinion and a short pinion that are arranged between the first pin and the second pin that can rotate and revolve, a first brake that can fix the ring gear, and a first pin that can fix the large-diameter sun gear. The long pinion meshes with each of the large diameter sun gear and the short pinion, and the short pinion meshes with each of the small diameter sun gear and the ring gear, so that the large diameter sun gear, the small diameter The sun gear, the ring gear and the carrier are combined, and the small diameter support As it gears the input rotating element, wherein the carrier may be provided respectively as the output rotating element (claim 6). In this case, the speed change mechanism is configured as a so-called Ravigneaux type planetary gear mechanism. Further, by selectively operating the two brakes, it is possible to realize two gear ratios of high and low.

  In one aspect of the driving apparatus of the present invention, the first electric motor, the power distribution mechanism, the second electric motor, the speed change mechanism, and the switching mechanism may be arranged in the axial direction from the internal combustion engine side. (Claim 8). In this case, the outer diameter on the internal combustion engine side is large, and the outer diameter becomes relatively small as the distance from the internal combustion engine increases. As a result, it is possible to provide a drive device with good in-vehicle performance for a front engine rear wheel drive vehicle (FR vehicle) in which the internal combustion engine is mounted in the longitudinal direction of the vehicle.

  In the driving device according to the aspect of the invention, the power distribution mechanism, the speed change mechanism, the output member, and the switching mechanism may be disposed between the first electric motor and the second electric motor. (Claim 9). According to this aspect, since the empty space between the coil ends of the first motor and the second motor can be effectively used, an increase in the dimension in the axial direction can be suppressed. As a result, it is possible to provide a drive device with good in-vehicle performance for a front engine front wheel drive vehicle (FF vehicle) in which the internal combustion engine is mounted in the vehicle width direction of the vehicle. In this aspect, the speed change mechanism is configured as a planetary gear mechanism having a sun gear, a ring gear, and a carrier, the carrier is fixed to be non-rotatable, and the sun gear is used as the input rotation element. Each of the ring gears may be provided as the output rotation element (claim 10).

  As described above, according to the present invention, since the rotation of the second motor is decelerated and transmitted to the transmission shaft in the output split mode by the speed change mechanism, the required torque of the second motor in the output split mode is reduced. Loss can be reduced.

(First form)
FIG. 1 shows an outline of a vehicle to which a drive device according to an embodiment of the present invention is applied. As shown in this figure, the vehicle 1 is configured as a so-called hybrid vehicle. The vehicle 1 is provided with a drive device 2A for traveling. The drive device 2A includes a transmission shaft 4 for transmitting power output from the internal combustion engine 3, a first motor / generator 5 as a first electric motor, and an output shaft 6 as an output member for outputting power to the drive wheels 13. A power distribution mechanism 7 having three rotation elements that can rotate differentially with each other, and a transmission shaft 4, a first motor / generator 5 and an output shaft 6 connected to each of the three rotation elements, and a transmission shaft A second motor / generator 8 serving as a second electric motor connected to either one of 4 and the output shaft 6, a first state in which the second motor / generator 8 and the output shaft 6 are connected, and a second motor / generator. 8 and a switching mechanism 9 as switching means for switching between the second state in which the transmission shaft 4 is connected. The drive device 2A is configured such that the second motor / generator 8 is connected to either the transmission shaft 4 or the output shaft 6 via the speed change mechanism 10, and switches the switching mechanism 9 to the first state. Thus, the input split mode is realized, and the output split mode is realized by switching the switching mechanism 9 to the second state.

  The internal combustion engine 3 is configured as a spark ignition type multi-cylinder internal combustion engine. The power of the internal combustion engine 3 is output to the transmission shaft 4 via a crankshaft (not shown). The 1st motor generator 5 is comprised so that the function as an electric motor and the function as a generator may be produced. A battery (not shown) is electrically connected to the first motor / generator 5 via an inverter (not shown), and the output torque or regenerative torque of the first motor / generator 5 is appropriately set by controlling the inverter. It is supposed to be. The first motor / generator 5 includes a rotor 5a provided coaxially with the transmission shaft 4 and a stator 5b positioned on the outer peripheral side of the rotor 5a. The stator 5b is fixed to the casing 12 so as not to rotate.

  The second motor / generator 8 has the same configuration as the first motor / generator 5. That is, the second motor / generator 8 includes a rotor 8a provided coaxially with the transmission shaft 4 (output shaft 6) and a stator fixed to the casing 12 so as to be positioned on the outer peripheral side of the rotor 8a. 8b. The second motor / generator 8 is electrically connected to a battery (not shown) via an inverter (not shown).

  The power distribution mechanism 7 is configured as a planetary gear mechanism. That is, the power distribution mechanism 7 rotates a sun gear S1 that is an external gear, a ring gear R1 that is an internal gear coaxially arranged with respect to the sun gear S1, and a pinion 15 that meshes with these gears S1 and R1. It is a well-known gear mechanism that has a carrier C1 that is held so as to be capable of revolving, and that generates a differential action between these three rotating elements. In this embodiment, the transmission shaft 4 is connected to the carrier C1, the rotor 5a of the first motor / generator 5 is connected to the sun gear S1, and the output shaft 6 is connected to the ring gear R1.

  The switching mechanism 9 is configured as a so-called meshing clutch, and includes a first state in which the second motor / generator 8 is connected to the output shaft 6 via the transmission mechanism 10, and the second motor / generator 8 is connected to the transmission mechanism 10. And a moving member 11 that can move in the axial direction between the second state connected to the transmission shaft 4 (carrier C1). In addition, the position of the moving member 11 shown on the upper side of FIG. 1 is a 1st state, and the position of the moving member 11 shown on the lower side of FIG. 1 is a 2nd state. Although the switching mechanism 9 realizes each of the first state and the second state with one moving member 11, these states can be realized with two sets of clutches.

  The speed change mechanism 10 is a mechanism that decelerates the power output from the second motor / generator 8 and transmits the power to the transmission shaft 4 or the output shaft 6, and is configured to be able to switch between at least two speed ratios. . The transmission mechanism 10 is configured as a so-called Ravigneaux type planetary gear mechanism, and includes two brakes B1 and B2 that can selectively fix a plurality of rotating elements of the planetary gear mechanism. The speed change mechanism 10 includes a large-diameter sun gear S21, a small-diameter small-diameter sun gear S22 disposed adjacent to the same axis as the large-diameter sun gear S21, a ring gear R2 disposed concentrically with the small-diameter sun gear S22, and these sun gears. The carrier C2 is disposed between S21, S22 and the ring gear R2 and holds the long pinion 16A and the short pinion 16B having different axial lengths so as to rotate and revolve. The long pinion 16A meshes with each of the large-diameter sun gear S21 and the short pinion 16B, and the short pinion 16B meshes with each of the small-diameter sun gear S22 and the ring gear R2. The large-diameter sun gear S21 is connected to the second brake B2, and the small-diameter sun gear S22 is connected to the rotor 8a of the second motor / generator 8. That is, the small-diameter sun gear S22 corresponds to the input rotation element according to the present invention. The ring gear R2 is connected to the first brake B1. The carrier C2 is connected to the transmission shaft 4 or the output shaft 6 via the switching mechanism 9. That is, the carrier C2 corresponds to the output rotation element according to the present invention.

  These brakes B1 and B2 are configured to be switched between an engaged state and a released state, for example, by switching between supply and stop of hydraulic pressure. When power is input from the second motor / generator 8 to the small-diameter sun gear S22 with the ring gear R2 fixed by the first brake B1, a deceleration action occurs, and the torque input to the small-diameter sun gear S22 is amplified and the carrier is amplified. Output from C2. On the other hand, when power is input from the second motor / generator 8 to the small-diameter sun gear S22 while the large-diameter sun gear S21 is fixed by the second brake B2, a deceleration action occurs, and the torque input to the small-diameter sun gear S22 is amplified. And output from the carrier C2. In the illustrated embodiment, the reduction ratio when the ring gear R2 is fixed is set to be larger than the reduction ratio when the large-diameter sun gear S21 is fixed. That is, the low speed gear ratio is set by engaging the first brake B1, and the high speed gear ratio is set by engaging the second brake B2. When both the brakes B1 and B2 are released, the transmission mechanism 10 enters a neutral state where torque is not transmitted. Accordingly, the speed change mechanism 10 is configured to be set to three states, that is, a low speed gear ratio, a high speed gear ratio, and a neutral state.

  The switching operation of the switching mechanism 9 and the speed change operation of the speed change mechanism 10 are performed by a control device (not shown). The control device is configured as a computer including a microprocessor and peripheral devices such as RAM and ROM necessary for its operation, and refers to information from sensors (not shown) mounted on each part of the vehicle 1 to switch the mechanism 9. And the operation of the transmission mechanism 10 is controlled.

  When the vehicle 1 is at low and medium speeds, the drive device 2A is set to the input split mode by the control device. FIG. 2 shows an example of an alignment chart in the input split mode. In this figure, “MG1” indicates the first motor / generator 5, “Eng” indicates the internal combustion engine 3, and “MG2” indicates the second motor / generator 8. In the input split mode, the control device switches the movable member 11 of the switching mechanism 9 to the first state, and engages the first brake B1 or the second brake B2 of the transmission mechanism 10 to set the low speed gear ratio or the high speed gear ratio. Then, the second motor / generator 8 and the output shaft 6 are connected. Thereby, the power output from the internal combustion engine 3 is transmitted to the carrier C1 of the power distribution mechanism 7 and distributed to the sun gear S1 and the ring gear R1. Since a load is applied to the ring gear R1 from the output shaft 6 side, the first motor / generator 5 connected to the sun gear S1 rotates forward. The first motor / generator 5 is caused to function as a generator. The electric power generated by the first motor / generator 5 is supplied to the second motor / generator 8, and the output torque thereof is amplified according to the gear ratio of the transmission mechanism 10 and transmitted to the output shaft 6. In other words, in the input split mode, a part of the output power of the internal combustion engine 3 is mechanically transmitted to the output shaft 6 via the power distribution mechanism 7, and the remaining part is transferred to the output shaft 6 with power conversion. Communicated. Since torque amplification occurs in each of the power distribution mechanism 7 and the speed change mechanism 10, the driving torque of the vehicle 1 that is the torque of the output shaft 6 can be increased.

  When the vehicle 1 is cruising at high speed, the overdrive state is set in which the rotational speed of the output shaft 6 is higher than the rotational speed of the transmission shaft 4. In this case, the second motor / generator 8 is caused to function as a generator and the electric power is supplied to the first motor / generator 5 to cause the first motor / generator 5 to perform reverse power running. When the second motor / generator 8 functions as a generator, the control device sets an output split mode for the drive device 2A in order to suppress power circulation and improve power transmission efficiency. FIG. 3 shows an example of an alignment chart in the output split mode. In this figure, “MG1” indicates the first motor / generator 5, “Eng” indicates the internal combustion engine 3, and “MG2” indicates the second motor / generator 8. In the output split mode, the control device switches the switching mechanism 9 to the second state, sets the gear ratio of the transmission mechanism 10 to the high speed gear ratio or the low speed gear ratio, and connects the second motor generator 8 and the internal combustion engine 3 to each other. Connected (FIG. 3 shows a state in which the gear ratio is set to the high speed gear ratio). The rotation speed of the second motor / generator 8 is not particularly high, and the rotation speed and output torque of the first motor / generator 5 that is reversely powered can be low and low. That is, the amount of power transmission accompanied by power conversion is reduced, and the proportion of mechanically transmitted power is relatively high, so that power transmission efficiency is improved. Moreover, the power of the second motor / generator 8 is decelerated by the speed change mechanism 10 and transmitted to the transmission shaft 4. As a result, the required torque of the second motor / generator 8 can be reduced as compared with the case where it is directly connected to the internal combustion engine 3 (transmission shaft 4), and the loss can be reduced.

  As shown in FIG. 1, the drive device 2 </ b> A includes a first motor / generator 5, a power distribution mechanism 7, a second motor / generator 8, a speed change mechanism 10, and a switching mechanism 9 in the axial direction from the internal combustion engine 3 side. The components are arranged. Therefore, the outer diameter on the internal combustion engine 3 side is large, and the outer diameter becomes relatively smaller as the distance from the internal combustion engine 3 increases. As a result, the drive device 2A has good in-vehicle performance with respect to a front engine rear wheel drive vehicle (FR vehicle) in which the internal combustion engine 3 is mounted in the longitudinal direction of the vehicle.

(Second form)
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 shows an outline of a vehicle to which the drive device according to the second embodiment is applied. Below, the same code | symbol is attached | subjected to FIG. As shown in FIG. 4, the drive device 2 </ b> B includes a speed change mechanism 17 that decelerates the power of the second motor / generator 8. The transmission mechanism 17 is configured as a planetary gear mechanism. The speed change mechanism 17 includes a sun gear S3, a ring gear R3 arranged coaxially with the sun gear S3, and a carrier C3 that holds the pinion 18 that meshes with each of the sun gear S3 and the ring gear R3 so as to rotate and revolve. Yes. The sun gear S3 is connected to the rotor 8a of the second motor / generator 8, and the sun gear S3 corresponds to the input rotating element according to the present invention. The ring gear R3 is fixed to the casing 12 so as not to rotate. As a result, the speed reduction mechanism 17 is decelerated, and the torque input to the sun gear S3 is amplified and output from the carrier C3. That is, the carrier C3 corresponds to the output rotation element according to the present invention. Unlike the first embodiment, the speed change mechanism 17 is limited to one type of gear ratio. Except for this point, the drive device 2B can exhibit the same effects as those of the first embodiment.

(Third form)
Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 5 shows an outline of a vehicle to which the drive device according to the third embodiment is applied. Below, the same code | symbol is attached | subjected to FIG. 5 about the structure common to a 1st form, and description is abbreviate | omitted. As shown in FIG. 5, the drive device 2 </ b> C includes a switching mechanism 19 and a transmission mechanism 20 unique to this embodiment. The drive device 2 </ b> C includes an output gear 21 as an output member, and the output gear 21 is configured to output power to the drive wheels 13. The switching mechanism 19 is configured as a so-called meshing clutch, and includes a first state where the second motor / generator 8 is connected to the output gear 21 via the transmission mechanism 20, and the second motor / generator 8 is connected to the transmission mechanism 20. And a moving member 22 that can move in the axial direction between the second state connected to the transmission shaft 4 (carrier C1). The input split mode is realized by switching the switching mechanism 19 to the first state, and the output split mode is realized by switching the switching mechanism 19 to the second state. Note that the position of the moving member 22 shown on the upper side of FIG. 5 is in the first state, and the position of the moving member 22 shown on the lower side of FIG. 5 is in the second state. Although the switching mechanism 19 realizes each of the first state and the second state by one moving member 22, these states can be realized by two sets of clutches.

  The transmission mechanism 20 is configured as a planetary gear mechanism, and holds a sun gear S4, a ring gear R4 arranged coaxially with the sun gear S4, and a pinion 23 that meshes with each of the sun gear S4 and the ring gear R4 so as to rotate and revolve. Carrier C4. The carrier C4 is fixed to the casing 12 so as not to rotate. The rotor 8a of the second motor / generator 8 is connected to the sun gear S4. That is, the sun gear S4 corresponds to the input rotation element of the present invention. The ring gear R4 is connected to the transmission shaft 4 or the output gear 21 via the switching mechanism 19. That is, the ring gear R4 corresponds to the output rotation element according to the present invention.

  The drive device 2C can exhibit the same effect as that of the first embodiment except that the speed ratio of the speed change mechanism 20 is limited to one type as in the second embodiment. As shown in FIG. 5, the driving device 2 </ b> C includes a power distribution mechanism 7, a switching mechanism 19, a transmission mechanism 20, and an output gear 21 between the first motor / generator 5 and the second motor / generator 8. Is arranged. That is, since the drive device 2C effectively utilizes the empty space between the coil ends of the first motor / generator 5 and the second motor / generator 8, an increase in the dimension in the axial direction can be suppressed. As a result, the drive device 2C has good in-vehicle performance with respect to a front engine front wheel drive vehicle (FF vehicle) in which the internal combustion engine 3 is mounted in the vehicle width direction of the vehicle.

  The present invention is not limited to the above embodiments, and can be implemented in various forms within the scope of the gist of the present invention. The configurations of the power distribution mechanism and the speed change mechanism described above are merely examples, and it is possible to change them to other forms that are mechanically equivalent. In addition, the connection relationship of the power distribution mechanism and the speed change mechanism with respect to the rotating elements can be changed to another form. Furthermore, the configuration of these with a planetary gear mechanism is merely an example, and for example, these may be replaced with a planetary roller mechanism having a friction wheel (roller) that is not a gear as a rotating element.

The figure which showed the outline of the vehicle to which the drive device which concerns on one form of this invention was applied. The figure which showed an example of the alignment chart in the case of input split mode. The figure which showed an example of the alignment chart in the case of output split mode. The figure which showed the outline of the vehicle to which the drive device which concerns on a 2nd form was applied. The figure which showed the outline of the vehicle to which the drive device which concerns on a 3rd form was applied.

Explanation of symbols

2A to 2C Driving device 3 Internal combustion engine 4 Transmission shaft 5 First motor / generator (first electric motor)
6 Output shaft (output member)
7 Power distribution mechanism 8 Second motor / generator (second electric motor)
9 Switching mechanism (switching means)
10 transmission mechanism 16A long pinion 16B short pinion 17 transmission mechanism 19 switching mechanism 20 transmission mechanism 21 output gear (output member)
B1 1st brake B2 2nd brake S1 Sun gear S21 Large diameter sun gear S22 Small diameter sun gear (input rotation element)
S3 Sun gear (input rotation element)
S4 Sun gear (input rotation element)
R1 Ring gear R2 Ring gear R3 Ring gear R4 Ring gear (output rotation element)
C1 carrier C2 carrier (output rotation element)
C3 carrier (output rotating element)

Claims (10)

The transmission shaft for transmitting the power output from the internal combustion engine, the first electric motor, the output member for outputting the power to the drive wheels, and three rotating elements capable of differentially rotating with each other. A power distribution mechanism to which the transmission shaft, the first motor and the output member are connected, respectively, and a second motor connected to either the transmission shaft or the output member, the second motor The connection state of the second motor is switched between an input split mode in which the output member is connected to the output split mode and an output split mode in which the second motor and the transmission shaft are connected. In the hybrid vehicle drive device,
A hybrid further comprising a speed change mechanism that is interposed between the second motor and the transmission shaft and decelerates the rotation of the second motor and transmits the rotation to the transmission shaft in the output split mode. Car drive device.   The speed change mechanism is configured to be interposed between the second electric motor and the output member so as to decelerate and transmit the rotation of the second electric motor to the output member in the input split mode. The hybrid vehicle drive device according to claim 1. The speed change mechanism includes an input rotation element to which the second electric motor is connected, and an output rotation element that rotates differentially with respect to the input rotation element.
A first state in which the output rotation element and the output member are connected to realize the input split mode, and a second state in which the output rotation element and the transmission shaft are connected to realize the output split mode. The hybrid vehicle drive device according to claim 1, further comprising switching means for switching.   The power distribution mechanism is configured as a planetary gear mechanism having a sun gear, a ring gear and a carrier as the three rotating elements, the transmission shaft is the carrier, the first electric motor is the sun gear, and the output member is the output member. The hybrid vehicle drive device according to claim 3, wherein the hybrid vehicle drive device is connected to each ring gear.   The drive device for a hybrid vehicle according to claim 4, wherein the speed change mechanism is configured to be capable of setting at least two speed ratios.   The transmission mechanism includes a large-diameter sun gear and a small-diameter sun gear that are adjacent to each other and having different outer diameters, a ring gear that is coaxially disposed on the small-diameter sun gear, the large-diameter sun gear, the small-diameter sun gear, and the ring gear. A carrier that is disposed between and holds a long pinion and a short pinion having different lengths in the axial direction so as to rotate and revolve, a first brake that can fix the ring gear, and a second brake that can fix the large-diameter sun gear. The long pinion meshes with each of the large diameter sun gear and the short pinion, and the short pinion meshes with each of the small diameter sun gear and the ring gear, so that the large diameter sun gear, the small diameter sun gear, The ring gear and the carrier are combined, and the small-diameter sun gear Wherein an input rotating element, a hybrid vehicle drive system according to claim 5, wherein the carrier is respectively provided as the output rotating element.   The transmission mechanism is configured as a planetary gear mechanism having a sun gear, a ring gear, and a carrier, and includes a brake capable of fixing the ring gear, and the sun gear is used as the input rotation element, and the carrier is used as the output rotation element. The hybrid vehicle drive device according to claim 4, wherein each of the drive devices is provided.   8. The apparatus according to claim 3, wherein the first electric motor, the power distribution mechanism, the second electric motor, the transmission mechanism, and the switching mechanism are arranged in the axial direction from the internal combustion engine side. Hybrid vehicle drive system.   5. The hybrid vehicle drive device according to claim 3, wherein the power distribution mechanism, the speed change mechanism, the output member, and the switching mechanism are arranged between the first motor and the second motor, respectively. 6.   The speed change mechanism is configured as a planetary gear mechanism having a sun gear, a ring gear, and a carrier, the carrier is fixed so as not to rotate, and the sun gear serves as the input rotation element, and the ring gear serves as the output rotation. The hybrid vehicle drive device according to claim 9, which is provided as an element.

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