JP5218031B2 - Vehicle drive device - Google Patents

Description

  The present invention relates to a driving apparatus for a vehicle provided with an electric motor together with an internal combustion engine.

  As a vehicle drive unit, an internal combustion engine is connected to one of the three rotating elements of a power split mechanism that rotates differentially with each other, a first motor is connected to the other, and a drive shaft is connected to the other. And a drive device for an FR vehicle in which the power of the second motor is transmitted to the output shaft and the rotation of the drive shaft is changed by the speed change mechanism, and the engine is arranged in the front of the vehicle and the drive wheels are laid out in the rear. Is known (Patent Document 1). In addition, there are Patent Documents 2 to 4 as prior art documents related to the present invention.

JP 2003-127679 A JP-A-8-183347 JP-A-8-318747 JP 2000-135931 A

  The drive device of Patent Document 1 is intended to be mounted on an FR vehicle, and application to an FF vehicle in which drive wheels are arranged together with an engine in front of the vehicle is not considered. Therefore, a drive device suitable for an FF vehicle is simply obtained by replacing the drive shaft of the drive device of Patent Document 1 with a counter drive gear and simply arranging the first motor, the power split mechanism, the speed change mechanism, and the second motor in the axial direction. Can't get.

  Then, an object of this invention is to provide the drive device of the vehicle suitable for mounting to FF vehicle.

The drive device of the present invention includes a first electric motor, a first rotating element connected to the internal combustion engine, a second rotating element connected to the first electric motor, and a power dividing mechanism having a third rotating element for outputting power. The transmission mechanism for shifting the rotation of the third rotating element of the power split mechanism, the second motor, and the output of the transmission mechanism are transmitted via the counter drive gear and the output of the second motor is transmitted. And the output portion of the counter drive gear, the speed change mechanism, the power split mechanism, and the first electric motor in order of the counter drive gear, toward the side away from the internal combustion engine. And the second electric motor is disposed on a second axis parallel to the first axis, the transmission mechanism being sandwiched from both sides in the direction of the first axis. Two rotating support wall extending from the serial case provided et al is, between one of the rotation supporting walls of the two rotation supporting walls between the counter drive gear and the speed change mechanism, the two rotary support wall Any one of the rotation support walls is disposed between the speed change mechanism and the power split mechanism, and the counter drive gear has one of the two rotation support walls and the rotation support. It is rotatably supported in a state of being sandwiched from both sides in the direction of the first axis by a gear support provided on the opposite side of the wall.

  According to this drive device, the first electric motor, the power split mechanism, and the speed change mechanism are arranged on a common first axis, while the second electric motor is arranged on a second axis parallel to the first axis. Therefore, the dimension in the axial direction can be shortened compared to the case where the second electric motor is arranged on the first axis. Thereby, the mounting property to FF vehicle improves. Further, since the rotation support walls are provided on both sides of the transmission mechanism, the thrust force related to the direction of the first axis caused by the generation of the transmission mechanism is applied to the counter drive gear, the first electric motor, and the like arranged on the first axis. Input can be prevented. For this reason, since it becomes possible to use a small bearing for rotating and supporting the counter drive gear and the like, it is possible to contribute to shortening the dimension in the axial direction. Furthermore, since the counter drive gear is supported while being sandwiched between the rotation support wall and the gear support portion from both sides, the support accuracy of the counter drive gear can be improved.

  In one aspect of the drive device of the present invention, an oil passage for guiding oil to be supplied to the speed change mechanism may be formed in at least one of the two rotation support walls. Since the rotation support wall also serves as the oil passage, it is not necessary to prepare a dedicated wall for forming the oil passage, so that the dimension in the axial direction is shortened. In the case where oil passages are formed in both of the two rotation support walls, the oil passages exist on both sides of the speed change mechanism. Therefore, it is possible to easily handle the oil passage with respect to the transmission mechanism, and it is possible to easily cope with the multi-stage transmission mechanism that involves an increase in the number of hydraulic engagement means such as clutches and brakes.

  In one aspect of the driving apparatus of the present invention, the first electric motor includes a stator fixed to the case and a rotor disposed on the inner peripheral side of the stator, and a space is provided on the inner peripheral side of the rotor. The power split mechanism may be formed in the space formed on the inner peripheral side of the rotor (claim 3). According to this aspect, since the power split mechanism is arranged in the space formed on the inner peripheral side of the rotor of the first motor, the power split mechanism and the rotor of the first motor overlap with respect to the direction of the first axis. It becomes a state. For this reason, the dimension of an axial direction can be shortened compared with the case where these are arranged in the direction of the 1st axis without overlapping.

  In one aspect of the driving apparatus of the present invention, the output unit includes a power transmission gear to which power output from the second electric motor is transmitted, and a counter driven gear in which the counter drive gear and the power transmission gear mesh with each other. (Claim 4). According to this aspect, since the counter driven gear can be shared by the counter drive gear and the power transmission gear, it is easy to reduce the size compared to the case where two counter driven gears for each gear are arranged in the axial direction. Can be achieved.

  As described above, according to the drive device of the present invention, the second electric motor and the remaining components among the components are arranged separately on the first axis and the second axis that are parallel to each other. Therefore, the dimension in the axial direction can be shortened as compared with the case where the respective components are arranged on the same axis. In addition, rotation support walls are provided on both sides of the transmission mechanism, and the thrust force from the transmission mechanism can be prevented from being input to the counter drive gear, the first electric motor, etc. Since it is possible to use a small one, it is possible to contribute to shortening the dimension in the axial direction. Therefore, the mounting property to FF vehicle improves.

  FIG. 1 is a configuration diagram showing a cross section of a drive device according to an embodiment of the present invention, FIG. 2 is a configuration diagram showing another cross section of the drive device, and FIG. 3 is a partially enlarged view of FIG. The drive device 1 shown in these drawings is mounted on a vehicle (not shown) so that the vehicle can function as a hybrid vehicle. 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 as another driving force source for traveling. The drive device 1 is configured for mounting on an FF vehicle.

  The drive device 1 is an internal combustion engine 3, a first motor / generator 4, a power split mechanism 5 to which the internal combustion engine 3 and the first motor / generator 4 are respectively connected, and power from the power split mechanism 5 is transmitted. A cylindrical intermediate shaft 6, a speed change mechanism 7 that changes the speed of the rotation of the intermediate shaft 6, a second motor / generator 8, and power output from the speed change mechanism 7 and the second motor / generator 8, driving wheels (not shown). And an output unit 9 for transmitting the signal.

  The first motor / generator 4, the power split mechanism 5, and the speed change mechanism 7 are arranged on a common first axis Ax. The second motor / generator 8 is arranged on the second axis Ax2 parallel to the first axis Ax1 so as to overlap the first motor / generator 4 in the axial direction. That is, the first motor / generator 4 and the second motor / generator 8 are arranged on different axes. Therefore, the dimension in the axial direction can be shortened as compared with the case where the second motor / generator 8 is arranged on the first axis Ax1, so that the mountability to the FF vehicle is improved.

  The internal combustion engine 3 shown in FIG. 1 is configured as a spark ignition type multi-cylinder internal combustion engine, and its power is transmitted to the power split mechanism 5 via the input shaft 15. The input shaft 15 is coaxially arranged with the intermediate shaft 6 in a state of being inserted on the inner peripheral side of the intermediate shaft 6, and the input shaft 15 and the intermediate shaft 6 relatively rotate around the axis Ax1. A damper (not shown) is interposed between the input shaft 15 and the internal combustion engine 3, and torque fluctuations of the internal combustion engine 3 are absorbed by the damper.

  The first motor / generator 4 and the second motor / generator 8 have the same configuration, and have both a function as an electric motor and a function as a generator. As shown in FIG. 1, the first motor / generator 4 includes a stator 18 fixed to a case 17 and a rotor 19 disposed coaxially on the inner peripheral side of the stator 18. As shown in FIG. 2, the second motor / generator 8 similarly includes a stator 20 fixed to the case 17 and a rotor 21 arranged coaxially on the inner peripheral side of the stator 20. The first motor / generator 4 corresponds to the first electric motor according to the present invention, and the second motor / generator 8 corresponds to the second electric motor according to the present invention.

  The power split mechanism 5 is disposed in a space S formed on the inner peripheral side of the rotor 19 of the first motor / generator 4. For this reason, as shown in the figure, the power split mechanism 5 and the rotor of the first motor / generator 4 are overlapped with respect to the direction of the first axis Ax1, and therefore when they are arranged in the direction of the first axis Ax. Compared to the above, the axial dimension can be shortened. The power split mechanism 5 is configured as a single pinion type planetary gear mechanism having three rotational elements that can rotate differentially with each other, and is coaxial with the sun gear Su1 that is an external gear and the sun gear Su1. A ring gear Ri1, which is an internal gear disposed, and a carrier Cr1 that holds the pinion 25 meshing with the gears Su1, Ri1 so as to rotate and revolve freely. In this embodiment, the input shaft 15 is connected to the carrier Cr1, the first motor / generator 4 is connected to the sun gear Su1, and the intermediate shaft 6 is connected to the ring gear Ri1. Accordingly, the carrier Cr1 corresponds to the first rotating element according to the present invention, the sun gear Su1 corresponds to the second rotating element according to the present invention, and the ring gear Ri1 corresponds to the third rotating element according to the present invention.

  The transmission mechanism 7 includes a transmission differential mechanism 30 configured as a Ravigneaux type planetary gear mechanism using a stepped long pinion, a clutch C that switches a connection relationship between rotating elements of the transmission differential mechanism 30, and two Brakes B1 and B2 are provided. The transmission mechanism 7 can selectively establish three shift stages from the first speed to the third speed by changing the combination of the operating states of the clutch C and the brakes B1 and B2. The transmission differential mechanism 30 includes a large-diameter sun gear Su2, a small-diameter small-diameter sun gear Su3 disposed adjacent to the same axis as the large-diameter sun gear Su2, a ring gear Ri2 disposed concentrically with the small-diameter sun gear Su3, A carrier Cr2 is provided between the sun gears Su2 and Su3 and the ring gear Ri2 and holds the long pinion 31 and the short pinion 32 having different axial lengths so as to rotate and revolve freely. The long pinion 31 is configured as a stepped pinion having a small-diameter portion 31a and a large-diameter portion 31b having different numbers of teeth. The small-diameter portion 31a is a large-diameter sun gear Su2, and the large-diameter portion 31b is a short-pinion 32. Each biting. The short pinion 32 meshes with the large diameter portion 31b of the long pinion 31 and the ring gear Ri2.

  The clutch C operates between an engaged state in which the intermediate shaft 6 and the sun gear Su2 are coupled and a released state in which the coupling is released. The first brake B1 operates between an engagement state in which the sun gear Su2 and the case 17 are coupled and a release state in which the coupling is released, and the second brake B2 is an engagement state in which the ring gear Ri2 and the case 17 are coupled. And the release state that releases the binding. Each brake B <b> 1, B <b> 2 is disposed on the outer peripheral side of the transmission differential mechanism 30. For this reason, the dimension of an axial direction can be shortened compared with the case where a brake is arrange | positioned next to the axial direction of the action mechanism 30 for transmission.

  The output unit 9 includes a counter drive gear 41 to which power output from the speed change mechanism 7 is transmitted, a power transmission gear 42 to which power output from the second motor / generator 8 is transmitted, and these gears 41 and 42. Counter-driven gear 43 that meshes in common, and a differential device 44 that transmits power via the counter-driven gear 43 to the left and right drive wheels. Since the counter driven gear 43 can be shared by the counter drive gear 41 and the power transmission gear 42, the size reduction can be easily achieved as compared with the case where two counter driven gears for each gear are arranged in the axial direction. An intermediate gear 45 that is coaxial with the counter driven gear 43 and rotates integrally is interposed between the counter driven gear 43 and the differential device 44, and this intermediate gear 45 is a driven gear provided in the case of the differential device 44. 46 is engaged. As shown in FIGS. 2 and 3, the counter drive gear 41 is provided on the outer periphery of the input shaft 15 so as to rotate integrally with the carrier Cr <b> 2 of the transmission differential mechanism 30. The power transmission gear 42 is formed on the rotor shaft 21 a so as to rotate integrally with the rotor shaft 21 a of the second motor / generator 8.

  As shown in FIG. 1, each of the above-described components of the drive device 1 is directed toward the side away from the internal combustion engine 3 (left side in FIG. 1), the counter drive gear 41, the transmission mechanism 7, the power split mechanism 5, These are arranged in the order of the motor / generator 4 on the common first axis Ax1. Among the constituent elements, the first motor / generator 4 is provided at the position farthest from the internal combustion engine 3, so that the interference between the first motor / generator 4 and the counter driven gear 43 can be prevented. Further, since the first motor / generator 4 and the power split mechanism 5 are adjacent to each other, it is possible to simplify the handling of a power transmission member such as a shaft for transmitting power between them. Similarly, since the power split mechanism 5 and the speed change mechanism 7 are adjacent to each other, handling of the power transmission member provided therebetween is simplified.

  Two rotation support walls 51 and 52 extending from the case 17 so as to sandwich the transmission mechanism 7 are provided on both sides of the transmission mechanism 7. These support walls 51 and 52 are provided to rotatably support rotating members such as the output shaft 15 and the intermediate shaft 6. The first rotation support wall 51 on the right side in FIG. 1 is provided between the speed change mechanism 7 and the counter drive gear 41. The counter drive gear 41 is rotatably supported by two bearings 54 and 55 provided on both sides in a state of being sandwiched between a first support wall 51 and a cover 53 that is positioned on the opposite side and bolted to the case 17. Has been. The cover 53 corresponds to a gear support portion according to the present invention. Since the two rotation support walls 51 and 52 are provided on both sides of the speed change mechanism 7, the thrust force in the direction of the first axis Ax 1 caused by the speed change mechanism 7 is generated by the counter drive gear 41 and the first motor / generator 4. Etc. can be prevented from being input. For this reason, since it becomes possible to use a small bearing for rotating and supporting the counter drive gear 41 and the like, it is possible to contribute to shortening the dimension in the axial direction. Since the counter drive gear 41 is supported by being sandwiched between the first rotation support wall 51 and the cover 53 from both sides, the support accuracy of the counter drive gear 41 can be improved as compared with the case of supporting on one side. it can.

  An oil passage 60 is formed in the second rotation support wall 52 on the opposite side (left side) of the first rotation support wall 51 to guide oil supplied to hydraulic engagement means such as the clutch C of the speed change mechanism 7. . The oil passage 60 opens to the outside of the case 17, and a valve body (not shown) constituting a hydraulic circuit is connected to the opening. By forming the oil passage 60 in the second rotation support wall 52, the second rotation support wall 52 also serves as the oil passage. Therefore, since it is not necessary to prepare a dedicated wall for forming the oil passage 60, the dimension in the axial direction is shortened. A similar oil passage may be formed in the first rotation support wall 51. In this case, since there are oil passages on both sides of the transmission mechanism 7, it is easy to route the oil passage with respect to the transmission mechanism 7, and the transmission mechanism is multistage with an increase in the number of hydraulic engagement means. It becomes easy to cope with.

  The present invention is not limited to the above embodiment, and can be implemented in various forms within the scope of the gist of the present invention. The above-described differential mechanisms in each form are merely examples, and it is possible to change them to other forms that are mechanically equivalent. The realization of the differential mechanism by a planetary gear mechanism is only an example. For example, all or part of the planetary gear mechanism of each embodiment described above can be replaced with a planetary roller mechanism having a friction wheel (roller) that is not a gear as a rotating element.

The block diagram which showed the cross section of the drive device which concerns on one form of this invention. The block diagram which showed the other cross section of the drive device of FIG. The elements on larger scale of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Drive device 3 Internal combustion engine 4 1st motor generator (1st electric motor)
5 Power split mechanism 7 Transmission mechanism 8 Second motor / generator (second motor)
DESCRIPTION OF SYMBOLS 9 Output part 17 Case 18 Stator 19 Rotor 41 Counter drive gear 42 Power transmission gear 43 Counter driven gear 51 1st rotation support wall 52 2nd rotation support wall 53 Cover (gear support part)
60 Oil passage Ax1 1st axis Ax2 2nd axis S Space on the inner circumference side of the rotor

Claims (4)

A power split mechanism having a first motor, a first rotating element connected to the internal combustion engine, a second rotating element connected to the first motor, and a third rotating element for outputting power; and the power split mechanism A speed change mechanism that changes the rotation of the third rotation element, a second electric motor, and an output unit that transmits the output of the speed change mechanism via a counter drive gear and the output of the second electric motor. The counter drive gear, the speed change mechanism, the power split mechanism, and the first electric motor are arranged in the order of the counter drive gear, the speed change mechanism, the power split mechanism, and the first motor toward the side away from the internal combustion engine. A second motor is a vehicle drive device disposed on a second axis parallel to the first axis,
Said two rotary support wall the transmission mechanism so as to sandwich from both sides in the direction of the first axis extends from the case provided et al is, the two one of the rotation supporting walls the counter drive gear of the rotation supporting wall Between the transmission mechanism and the transmission mechanism, either one of the two rotation support walls is disposed between the transmission mechanism and the power split mechanism, and the counter drive gear rotates the two rotation supports. It is rotatably supported in a state of being sandwiched from both sides in the direction of the first axis by any one of the support walls and a gear support provided on the opposite side of the support wall. A drive device for a vehicle.   The drive device according to claim 1, wherein an oil passage that guides oil to be supplied to the speed change mechanism is formed in at least one of the two rotation support walls. The first electric motor has a stator fixed to the case and a rotor disposed on the inner peripheral side of the stator, and a space is formed on the inner peripheral side of the rotor,
The drive unit according to claim 1, wherein the power split mechanism is disposed in the space formed on an inner peripheral side of the rotor.   The output section includes a power transmission gear to which power output from the second electric motor is transmitted, and a counter driven gear in which the counter drive gear and the power transmission gear mesh with each other. The drive apparatus as described in any one of -3.

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