Vehicular driving device

Abstract

To provide a vehicular driving device with a structure in which an engagement device for connecting and disconnecting power transmission from a second rotary electric machine to a differential gear mechanism for distribution is provided, which can be easily downsized.SOLUTION: An engagement device 4 comprises a first engaged part 5 provided on an outer peripheral surface of a first rotating body 1, a second engaged part 6 provided on an inner peripheral surface of a second rotating body 2, and an engaging member 7. The first engaged part 5 and the second engaged part 6 overlap with each other in a radial view. The engaging member 7 comprises a first engaging part 71 that engages with the first engaged part 5, and a second engaging part 72 that engages with the second engaged part 6. When the engaging member 7 moves in an axial direction L, a state of the engagement device 4 of a meshing type varies to a state where the first engaging part 71 engages with the first engaged part 5 and the second engaging part 72 engages with the second engaged part 6 and to a second state which is at least either of a state where the engagement of the first engaging part 71 with the first engaged part 5 is released and a state where the engagement of the second engaging part 72 with the second engaged part 6 is released.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle drive device including an input member drivingly connected to an internal combustion engine, an output member drivingly connected to wheels, a distribution differential gear mechanism, a first rotating electric machine, and a second rotating electric machine. [Background technology]

[0002] An example of such a vehicle drive device is disclosed in the following Patent Document 1. In the following description of the background art, the reference numerals in Patent Document 1 will be cited in parentheses.

[0003] In the vehicle drive device (10) of Patent Document 1, the distribution differential gear mechanism (28) is a single-pinion planetary gear mechanism including a sun gear (S), a carrier (CA), and a ring gear (R). The sun gear (S) is connected to a rotor (58) of a first rotating electric machine (MG1) so as to rotate integrally therewith. The carrier (CA) is connected to an input member (14) so ​​as to rotate integrally therewith. The ring gear (R) is drivingly connected to a differential input gear (74) serving as an output member and a rotor (90) of a second rotating electric machine (MG2) via a power transmission mechanism.

[0004] The power transmission mechanism includes a first gear (38) that rotates integrally with the ring gear (R), a second gear (72) that meshes with the first gear (38), a third gear (76) that rotates integrally with the second gear (72) and meshes with the differential input gear (74), and a fourth gear (70) that rotates integrally with the rotor (90) of the second rotating electric machine (MG2) and meshes with the second gear (72). [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2013-23036 Summary of the Invention [Problem to be solved by the invention]

[0006] In the vehicle drive device (10) of Patent Document 1, when the internal combustion engine is stopped and the wheels are driven by the driving force of the second rotating electric machine (MG2), the driving force of the second rotating electric machine (MG2) is transmitted to the differential input gear (74) via the fourth gear (70), the second gear (72), and the third gear (76).

[0007] At this time, even though the internal combustion engine is stopped, the rotation of the fourth gear (70), which rotates integrally with the rotor (90) of the second rotating electric machine (MG2), is transmitted to the distribution differential gear mechanism (28) via the second gear (72) and the first gear (38). As a result, the rotor (58) of the first rotating electric machine (MG1) is rotated, which leads to a decrease in the energy efficiency of the vehicle drive device (10).

[0008] Therefore, it is conceivable to provide an engagement device that connects and disconnects the power transmission from the second rotating electric machine (MG2) to the distribution differential gear mechanism (28), but this has the problem that the vehicle drive device (10) tends to become large in size.

[0009] Therefore, it is desirable to realize a vehicle drive device that can be easily downsized in a configuration provided with an engagement device that connects and disconnects the power transmission from the second rotating electric machine to the distribution differential gear mechanism. [Means for solving the problem]

[0010] In view of the above, the characteristic configuration of the vehicle drive device is as follows: an input member drivingly connected to the internal combustion engine; an output member drivingly connected to the wheels; a first rotating electric machine including a first rotor; a second rotating electric machine including a second rotor; a distribution differential gear mechanism including a first rotating element, a second rotating element, and a third rotating element; A vehicle drive device including a power transmission mechanism, the first rotating element is drivingly connected to the first rotor; the second rotational element is drivingly connected to the input member; the third rotation element is drivingly connected to the output member and the second rotor via the power transmission mechanism, the first rotating electric machine and the distribution differential gear mechanism are disposed on a first axis that is a rotation axis of the input member, The power transmission mechanism includes: a first rotating body that rotates integrally with the third rotating element; a second rotor disposed on the first axis and supported so as to be rotatable relative to the first rotor; a first gear that rotates integrally with the second rotor; a second gear rotatably supported on a second axis separate from the first axis and meshing with the first gear; a meshing type engagement device that engages and disengages the first rotating body and the second rotating body, A direction along the first axis is defined as an axial direction, and a direction perpendicular to the first axis is defined as a radial direction, the second rotor is disposed radially outward relative to the first rotor, the engagement device includes a first engaged portion provided on an outer circumferential surface of the first rotating body, a second engaged portion provided on an inner circumferential surface of the second rotating body, and an engagement member; the first engaged portion and the second engaged portion are arranged to overlap each other when viewed in the radial direction, the engaging member includes a first engaging portion that engages with the first engaged portion and a second engaging portion that engages with the second engaged portion, The engaging device is characterized in that, as the engaging member moves in the axial direction, it changes state between a first state in which the first engaging portion engages with the first engaged portion and the second engaging portion engages with the second engaged portion, and a second state in which the first engaging portion and the first engaged portion are disengaged and / or the second engaging portion and the second engaged portion are disengaged.

[0011] According to this characteristic configuration, the first rotating body, which rotates integrally with the third rotating element of the distribution differential gear mechanism, is disposed radially inward relative to the second rotating body, which rotates integrally with the first gear. The first engaged portion provided on the outer circumferential surface of the first rotating body and the second engaged portion provided on the inner circumferential surface of the second rotating body are disposed so as to overlap each other in a radial view. This makes it easier to reduce the axial dimension of the vehicle drive device compared to a configuration in which the first engaged portion and the second engaged portion are disposed side by side in the axial direction. According to this characteristic configuration, the engaging member includes a first engaging portion that engages with the first engaged portion and a second engaging portion that engages with the second engaged portion. The state of engagement of the engaging device changes as the engaging member moves in the axial direction. This allows the first rotating body and the second rotating body to be appropriately engaged and disengaged, even in a configuration in which the first engaged portion and the second engaged portion overlap each other when viewed in the radial direction, as described above. As described above, according to this characteristic configuration, even in a configuration in which an engagement device that connects and disconnects power transmission from the second rotating electric machine to the distribution differential gear mechanism is provided, it is easy to achieve a reduction in size of the vehicle drive device. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a skeleton diagram of a vehicle drive device according to an embodiment; [Figure 2] FIG. 1 is a partially enlarged cross-sectional view of a vehicle drive device according to an embodiment, taken along an axial direction; DETAILED DESCRIPTION OF THE INVENTION

[0013] A vehicle drive device 100 according to an embodiment will be described below with reference to the drawings.

[0014] 1, the vehicle drive device 100 includes an input member I, an output member O, a first rotating electric machine MG1, a second rotating electric machine MG2, a distribution differential gear mechanism SP, and a power transmission mechanism PT. In this embodiment, the vehicle drive device 100 further includes an output differential gear mechanism DF. In this embodiment, the input member I, the output member O, the first rotating electric machine MG1, the second rotating electric machine MG2, the distribution differential gear mechanism SP, the power transmission mechanism PT, and the output differential gear mechanism DF are housed in a case CS (see FIG. 2).

[0015] The input member I is a member drivingly connected to the internal combustion engine EG. The internal combustion engine EG functions as a driving force source for the wheels W. The internal combustion engine EG is a prime mover (gasoline engine, diesel engine, etc.) that is driven by the combustion of fuel to extract power.

[0016] Here, in this application, the term "driving connection" refers to a state in which two rotating elements are connected so as to be able to transmit a driving force, and includes a state in which the two rotating elements are connected so as to rotate integrally, or a state in which the two rotating elements are connected so as to be able to transmit a driving force via one or more transmission members. Such transmission members include various members that transmit rotation at the same speed or at a variable speed, such as shafts, gear mechanisms, belts, and chains. Note that transmission members may also include engagement devices that selectively transmit rotation and driving force, such as friction engagement devices and meshing engagement devices. However, when the term "driving connection" is used to refer to the rotating elements of a planetary gear mechanism, it refers to a state in which they are connected to each other without any other rotating elements passing through them.

[0017] Hereinafter, the direction along the first axis X1, which is the rotation axis of the input member I, will be referred to as the "axial direction L." One side of the axial direction L will be referred to as the "first axial side L1," and the other side of the axial direction L will be referred to as the "second axial side L2." Furthermore, the direction perpendicular to the first axis X1 will be referred to as the "radial direction R."

[0018] In this embodiment, the input member I is an input shaft 10 formed to extend along the axial direction L.

[0019] Each of the first rotating electric machine MG1 and the second rotating electric machine MG2 has a function as a motor (electric motor) that receives a supply of electric power to generate power, and a function as a generator (electric power generator) that receives a supply of power to generate electric power.

[0020] The first rotating electrical machine MG1 includes a first stator ST1 and a first rotor RT1. The first stator ST1 is fixed to a non-rotating member (here, a case CS). The first rotor RT1 is supported rotatably relative to the first stator ST1.

[0021] The second rotating electrical machine MG2 includes a second stator ST2 and a second rotor RT2. The second stator ST2 is fixed to a non-rotating member (here, a case CS). The second rotor RT2 is supported rotatably relative to the second stator ST2.

[0022] The distribution differential gear mechanism SP includes a first rotating element E1, a second rotating element E2, and a third rotating element E3. The order of rotational speeds of these rotating elements is first rotating element E1, second rotating element E2, and third rotating element E3. Here, the "order of rotational speeds" refers to the order of rotational speeds in the rotational state of each rotating element. The rotational speed of each rotating element changes depending on the state of the differential gear mechanism, but the order of high and low rotational speeds of each rotating element is constant because it is determined by the structure of the differential gear mechanism.

[0023] The first rotating element E1 is drivingly connected to the first rotor RT1. The second rotating element E2 is drivingly connected to the input member I. The third rotating element E3 is drivingly connected to the output member O and the second rotor RT2 via the power transmission mechanism PT.

[0024] In this embodiment, the distribution differential gear mechanism SP is configured as a planetary gear mechanism. The first rotating element E1, the second rotating element E2, and the third rotating element E3 are a sun gear, a carrier, and a ring gear, respectively. In addition, in this embodiment, the second rotating element E2 as a carrier supports a pinion gear that meshes with both the first rotating element E1 as a sun gear and the third rotating element E3 as a ring gear. In other words, in this embodiment, the distribution differential gear mechanism SP is configured as a single-pinion planetary gear mechanism.

[0025] The first rotating electric machine MG1 and the distribution differential gear mechanism SP are arranged on a first axis X1, which is the rotational axis of the input member I. In other words, the input member I, the first rotating electric machine MG1, and the distribution differential gear mechanism SP are arranged coaxially. In this embodiment, the side of the distribution differential gear mechanism SP in the axial direction L on which the first rotor RT1 of the first rotating electric machine MG1 is arranged is referred to as a first axial side L1.

[0026] The power transmission mechanism PT includes a first rotating body 1, a second rotating body 2, a first gear 31, a second gear 32, and an engagement device 4. In this embodiment, the power transmission mechanism PT further includes a third gear 33 and a fourth gear 34.

[0027] The first rotating body 1 is disposed on the first axis X1. The first rotating body 1 is connected to the third rotating element E3 of the distribution differential gear mechanism SP so as to rotate integrally with the third rotating element E3. The first rotating body 1 is formed in a cylindrical shape with the first axis X1 as its axis. In this embodiment, the first rotating body 1 is formed so as to extend from the third rotating element E3, which serves as a ring gear, toward the first axial side L1.

[0028] The second rotating body 2 is disposed on the first axis X1. The second rotating body 2 is supported so as to be rotatable relative to the first rotating body 1. The second rotating body 2 is formed in a cylindrical shape with its axis center coincident with the first axis X1.

[0029] The second rotating body 2 is disposed on the outside of the first rotating body 1 in the radial direction R. The second rotating body 2 is disposed so as to overlap with the first rotating body 1 when viewed in the radial direction R. In this embodiment, the second rotating body 2 is disposed so as to overlap with both the first rotating body 1 and the third rotating element E3 serving as a ring gear when viewed in the radial direction R. Here, with regard to the arrangement of two elements, "overlapping when viewed in a particular direction" means that when an imaginary line parallel to the line of sight is moved in each direction perpendicular to the imaginary line, there is at least a partial area where the imaginary line intersects with both of the two elements.

[0030] The first gear 31 is connected to the second rotor 2 so as to rotate integrally with the second rotor 2. In this embodiment, the first gear 31 is formed on the outer circumferential surface of the second rotor 2 (see FIG. 2).

[0031] The second gear 32 is rotatably supported on a second axis X2 that is separate from the first axis X1. The second gear 32 meshes with the first gear 31.

[0032] The engagement device 4 is configured to connect and disconnect power transmission from the second rotating electric machine MG2 to the distribution differential gear mechanism SP. The engagement device 4 is a meshing type engagement device that engages and disengages the first rotating body 1 and the second rotating body 2. Therefore, when the first rotating body 1 and the second rotating body 2 are engaged, the first rotating body 1 and the second rotating body 2 are connected to each other so that they rotate integrally. On the other hand, when the engagement between the first rotating body 1 and the second rotating body 2 is released, the first rotating body 1 and the second rotating body 2 are allowed to rotate freely relative to each other.

[0033] The third gear 33 is disposed on the second axis X2. The third gear 33 is connected to the second gear 32 so as to rotate integrally with the second gear 32. In this embodiment, the third gear 33 has a smaller diameter than the second gear 32. The third gear 33 is disposed closer to the first axial side L1 than the second gear 32.

[0034] The fourth gear 34 is rotatably supported on a third axis X3, which is separate from the first axis X1 and the second axis X2. The fourth gear 34 meshes with the second gear 32. In this embodiment, the fourth gear 34 is connected to the second rotor RT2 of the second rotating electrical machine MG2 so as to rotate integrally with the second rotor RT2. That is, in this embodiment, the second rotating electrical machine MG2 is disposed on the third axis X3. Also, in this embodiment, the fourth gear 34 is disposed on the second axial side L2 with respect to the second rotor RT2.

[0035] The output differential gear mechanism DF is configured to distribute the rotation of the output member O to a pair of wheels W. The output differential gear mechanism DF is disposed on a fourth axis X4, which is separate from the first axis X1, the second axis X2, and the third axis X3. In this embodiment, the output differential gear mechanism DF includes a differential input gear 20. The differential input gear 20 meshes with the third gear 33. The differential input gear 20 functions as the output member O that is drivingly connected to the wheels W.

[0036] As shown in FIG. 2, the engaging device 4 includes a first engaged portion 5, a second engaged portion 6, and an engaging member .

[0037] The first engaged portion 5 is provided on the outer peripheral surface of the first rotating body 1. In this embodiment, the first engaged portion 5 is a plurality of splines that extend along the axial direction L and are distributed around the first axis X1 in the circumferential direction. The first engaged portion 5 is formed to extend from an end of the first rotating body 1 on the first axial side L1 toward the second axial side L2.

[0038] The second engaged portion 6 is provided on the inner peripheral surface of the second rotating body 2. In this embodiment, the second engaged portion 6 is a plurality of splines that extend along the axial direction L and are distributed around the first axis X1. The second engaged portion 6 is formed to extend from an end of the second rotating body 2 on the first axial side L1 toward the second axial side L2. In this embodiment, the second engaged portion 6 is disposed closer to the first axial side L1 than the first gear 31.

[0039] The first engaged portion 5 and the second engaged portion 6 are arranged so as to overlap each other when viewed in the radial direction R. In this embodiment, the dimension of the first engaged portion 5 in the axial direction L is larger than the dimension of the second engaged portion 6 in the axial direction L. When viewed in the radial direction R, the entire second engaged portion 6 overlaps with the first engaged portion 5. In addition, the second engaged portion 6 is arranged on the second axial side L2 with respect to the center of the first engaged portion 5 in the axial direction L.

[0040] The engaging member 7 has a first engaging portion 71 that engages with the first engaged portion 5 and a second engaging portion 72 that engages with the second engaged portion 6. The engaging member 7 is supported so as to be movable in the axial direction L relative to the first engaged portion 5 and the second engaged portion 6.

[0041] The engaging device 4 changes between a first state and a second state as the engaging member 7 moves in the axial direction L. The first state is a state in which the first engaging portion 71 engages with the first engaged portion 5 and the second engaging portion 72 engages with the second engaged portion 6 (see the first engaged portion 5, second engaged portion 6, first engaging portion 71, and second engaging portion 72 shown by solid lines in FIG. 2). The second state is at least one of a state in which the first engaging portion 71 and the first engaged portion 5 are disengaged from each other and a state in which the second engaging portion 72 and the second engaged portion 6 are disengaged from each other.

[0042] In this embodiment, the engaging member 7 is configured to move in the axial direction L while maintaining a state in which the first engaging portion 71 is engaged with the first engaged portion 5. That is, in this embodiment, the second state is a state in which the first engaging portion 71 is engaged with the first engaged portion 5, and the engagement between the second engaging portion 72 and the second engaged portion 6 is released (see the two-dot chain line in FIG. 2).

[0043] In the present embodiment, in the second state, the second engaging portion 72 is positioned closer to the first axial side L1 than the second engaged portion 6. That is, in the present embodiment, the engaging device 4 changes from the first state to the second state by the engaging member 7 moving toward the first axial side L1 in the first state.

[0044] In this embodiment, in the first state, movement of the engaging member 7 toward the second axial side L2 is restricted so that the engaging member 7 does not move toward the second axial side L2 and disengage the second engaging portion 72 from the second engaged portion 6. In this embodiment, the first rotating body 1 has a contact portion 11 with which the engaging member 7 abuts. The contact portion 11 restricts movement of the engaging member 7 toward the second axial side L2 by the engaging member 7 abutting against the contact portion 11 from the first axial side L1. In this embodiment, the contact portion 11 is formed to protrude outward in the radial direction R from the outer circumferential surface of the first rotating body 1. In addition, in this embodiment, the outer end of the contact portion 11 in the radial direction R is fixed to the third rotating element E3, which serves as a ring gear, by welding. The welded portion is located radially outward of the portion of the contact portion 11 with which the engaging member 7 abuts.

[0045] In this embodiment, the engaging member 7 is formed in a cylindrical shape with the first axis X1 as its axis. A first engaging portion 71 is provided on the inner peripheral surface of the engaging member 7. A second engaging portion 72 is provided on the outer peripheral surface of the engaging member 7. In this embodiment, each of the first engaging portion 71 and the second engaging portion 72 is a plurality of splines that extend along the axial direction L and are distributed in the circumferential direction around the first axis X1.

[0046] In this embodiment, the first engaged portion 5 has an extending portion 51. The extending portion 51 is disposed closer to the first axial side L1 than the second engaged portion 6. The extending portion 51 is also disposed on the first axial side L1 with respect to the first gear 31, between the distribution differential gear mechanism SP and the first rotor RT1 in the axial direction L. In this embodiment, the first rotating body 1 extends further to the first axial side L1 than the second engaged portion 6. A part of the first engaged portion 5 as a spline formed on the outer peripheral surface of the first rotating body 1 in a portion closer to the first axial side L1 than the second engaged portion 6 corresponds to the extending portion 51.

[0047] In this embodiment, the engagement device 4 further includes a drive mechanism 8 for moving the engagement member 7 in the axial direction L, and a detent mechanism 9 for maintaining the position of the engagement member 7 in the axial direction L.

[0048] The drive mechanism 8 includes a transmission shaft 81, a fork member 82, a rack gear 83, and a pinion gear 84.

[0049] The transmission shaft 81 is formed to extend along the axial direction L. The transmission shaft 81 is supported so as to be movable in the axial direction L relative to the case CS. The transmission shaft 81 is disposed on a fifth axis X5, which is separate from the first axis X1 to the fourth axis X4. In this embodiment, the first axis X1, the second axis X2, the third axis X3, the fourth axis X4, and the fifth axis X5 are disposed parallel to one another.

[0050] The fork member 82 holds the engaging member 7 so that the engaging member 7 moves in the axial direction L in conjunction with the transmission shaft 81. In this embodiment, the fork member 82 is connected to the transmission shaft 81 so as to move integrally with the transmission shaft 81. The fork member 82 extends inward in the radial direction R from the transmission shaft 81.

[0051] In this embodiment, a retaining groove 73 recessed inward in the radial direction R is formed continuously along the circumferential direction centered on the first axis X1 on the outer peripheral surface of the engaging member 7. The inner end of the fork member 82 in the radial direction R is formed in an arc shape that follows the retaining groove 73 and is disposed within the retaining groove 73. In this embodiment, the retaining groove 73 is disposed closer to the first axial side L1 than the second engaging portion 72. The engaging member 7 is configured to move in the axial direction L within a range in which the retaining groove 73 overlaps with the extending portion 51 of the first engaged portion 5 when viewed in the radial direction along the radial direction R.

[0052] The rack gear 83 is formed on the transmission shaft 81 along the axial direction L. In this embodiment, the rack gear 83 is disposed on the first axial side L1 of the connection portion of the transmission shaft 81 with the fork member 82.

[0053] The pinion gear 84 meshes with the rack gear 83 with its rotation axis perpendicular to the fifth axis X5. The pinion gear 84 is configured to rotate by a driving force from a driving source (not shown) such as an electric motor. As the pinion gear 84 rotates, the transmission shaft 81, on which the rack gear 83 that meshes with the pinion gear 84 is formed, moves in the axial direction L. As a result, the engagement member 7 moves in the axial direction L via the fork member 82 connected to the transmission shaft 81.

[0054] The detent mechanism 9 includes a detent groove portion 91 , a spherical body 92 , and a biasing member 93 .

[0055] The detent groove 91 is formed to be recessed from the outer circumferential surface of the transmission shaft 81 toward the fifth axis X5. The spherical body 92 is formed to fit into the detent groove 91. The biasing member 93 biases the spherical body 92 toward the fifth axis X5. In this embodiment, the biasing member 93 is a compression coil spring.

[0056] The two detent groove portions 91 are arranged side by side in the axial direction L to correspond to the first and second states of the engagement device 4. In the first state, a sphere 92 is fitted into one of the detent groove portions 91 (here, the detent groove portion 91 on the first axial side L1). On the other hand, in the second state, a sphere 92 is fitted into the other detent groove portion 91 (here, the detent groove portion 91 on the second axial side L2).

[0057] The detent grooves 91 have a shape that allows the spheres 92 to move relatively between the two detent grooves 91 when the engagement device 4 changes state between the first state and the second state. In this embodiment, the detent grooves 91 are formed in a V-shape in a cross section taken along the fifth axis X5. In this embodiment, the detent grooves 91 are formed continuously in the circumferential direction about the fifth axis X5.

[0058] In this embodiment, the vehicle drive system 100 further includes a first bearing B1 and a second bearing B2.

[0059] The first bearing B1 is disposed so as to contact the inner peripheral surface of the first rotating body 1. The first bearing B1 supports the first rotating body 1 from the inside in the radial direction R. In this embodiment, the first bearing B1 is supported from the inside in the radial direction R by a first support portion S1 provided on the case CS.

[0060] The first bearing B1 is arranged so as to overlap with at least one of the first engaged portion 5 and the second engaged portion 6 when viewed in the radial direction R. In this embodiment, the first bearing B1 is arranged so as to overlap with both the first engaged portion 5 and the second engaged portion 6 when viewed in the radial direction R.

[0061] The second bearing B2 is arranged so as to be in contact with the outer peripheral surface of the second rotating body 2. The second bearing B2 supports the second rotating body 2 from the outside in the radial direction R. In this embodiment, the second bearing B2 is supported from the outside in the radial direction R by a second support portion S2 provided on the case CS. Also, in this embodiment, the second bearing B2 is arranged so as to abut against a parking gear 21 formed on the outer peripheral surface of the second rotating body 2 from the first axial side L1. In this embodiment, the parking gear 21 is arranged closer to the first axial side L1 than the first gear 31.

[0062] The second bearing B2 is arranged so as to overlap with at least one of the first engaged portion 5 and the second engaged portion 6 when viewed in the radial direction R. In this embodiment, the second bearing B2 is arranged so as to overlap with both the first engaged portion 5 and the second engaged portion 6 when viewed in the radial direction R. In addition, the second bearing B2 is arranged so as to overlap with the first bearing B1 when viewed in the radial direction R.

[0063] In this embodiment, as described above, the first rotating body 1 is supported by the first bearing B1. The third rotating element E3, which rotates integrally with the first rotating body 1, is supported by the third bearing B3. The third bearing B3 is arranged so as to be in contact with the inner circumferential surface of the portion of the third rotating element E3 serving as a ring gear where no teeth are formed. The third bearing B3 supports the third rotating element E3 from the inside in the radial direction R. The third bearing B3 is arranged closer to the second axial side L2 than the first bearing B1. In this embodiment, the third bearing B3 is arranged closer to the second axial side L2 than the distribution differential gear mechanism SP.

[0064] In this embodiment, the second rotating body 2 is supported by not only the second bearing B2 but also the fourth bearing B4. The fourth bearing B4 is arranged so as to be in contact with the inner circumferential surface of the second rotating body 2. The fourth bearing B4 supports the second rotating body 2 from the inside in the radial direction R. The fourth bearing B4 is arranged closer to the second axial side L2 than the second bearing B2. In this embodiment, the fourth bearing B4 is arranged so as to overlap with the first gear 31 when viewed in the radial direction R. In addition, the fourth bearing B4 is arranged closer to the second axial side L2 than the third bearing B3.

[0065] Other Embodiments (1) In the above embodiment, the distribution differential gear mechanism SP is configured as a single-pinion planetary gear mechanism, and the first rotating element E1, the second rotating element E2, and the third rotating element E3 are a sun gear, a carrier, and a ring gear, respectively. However, the present invention is not limited to such a configuration. For example, the distribution differential gear mechanism SP may be configured as a double-pinion planetary gear mechanism. In this configuration, it is preferable that the first rotating element E1, the second rotating element E2, and the third rotating element E3 are a sun gear, a ring gear, and a carrier, respectively.

[0066] (2) In the above embodiment, an example has been described in which the power transmission mechanism PT includes the third gear 33 connected to the second gear 32 so as to rotate integrally therewith and meshing with the differential input gear 20, and the fourth gear 34 connected to the second rotor RT2 of the second rotating electric machine MG2 so as to rotate integrally therewith and meshing with the second gear 32. However, the present invention is not limited to such a configuration, and for example, the power transmission mechanism PT may include another gear instead of or in addition to the third gear 33 and the fourth gear 34. Furthermore, the power transmission mechanism PT may include another engagement device (clutch, brake) in addition to the engagement device 4.

[0067] (3) In the above embodiment, the engagement device 4 is configured to change between a first state and a second state. However, the present invention is not limited to such a configuration. For example, the engagement device 4 may be configured to change into a third state in addition to the first and second states. The third state is, for example, a state in which the first engagement portion 71 is engaged with the first engaged portion 5 and a third engaged portion provided on the case CS, and the second engagement portion 72 is disengaged from the second engaged portion 6. In this third state, power transmission between the first rotating body 1 and the second rotating body 2 is interrupted, and the third rotating element E3 is fixed to the case CS via the first rotating body 1. Therefore, the first rotating electric machine MG1 can generate electricity using the driving force of the internal combustion engine EG transmitted via the distribution differential gear mechanism SP.

[0068] (4) The configurations disclosed in the above-described embodiments can be applied in combination with configurations disclosed in other embodiments, as long as no contradictions arise. Regarding other configurations, the embodiments disclosed in this specification are merely examples in all respects. Therefore, various modifications can be made as appropriate within the scope of the present disclosure.

[0069] [Summary of this embodiment] The vehicle drive device (100) described above will now be outlined.

[0070] The vehicle drive device (100) includes: an input member (I) drivingly connected to an internal combustion engine (EG); an output member (O) drivingly connected to a wheel (W); a first rotating electric machine (MG1) having a first rotor (RT1); a second rotating electric machine (MG2) equipped with a second rotor (RT2); a distribution differential gear mechanism (SP) including a first rotating element (E1), a second rotating element (E2), and a third rotating element (E3); A vehicle drive device (100) including a power transmission mechanism (PT), the first rotating element (E1) is drivingly connected to the first rotor (RT1); the second rotating element (E2) is drivingly connected to the input member (I), the third rotating element (E3) is drivingly connected to the output member (O) and the second rotor (RT2) via the power transmission mechanism (PT), the first rotating electric machine (MG1) and the distribution differential gear mechanism (SP) are disposed on a first axis (X1) which is a rotation axis of the input member (I); The power transmission mechanism (PT) a first rotating body (1) that rotates integrally with the third rotating element (E3); a second rotating body (2) disposed on the first axis (X1) and supported so as to be rotatable relative to the first rotating body (1); a first gear (31) that rotates integrally with the second rotor (2); a second gear (32) that is rotatably supported on a second axis (X2) that is separate from the first axis (X1) and that meshes with the first gear (31); a meshing type engagement device (4) that engages and disengages the first rotating body (1) and the second rotating body (2), The direction along the first axis (X1) is defined as an axial direction (L), and the direction perpendicular to the first axis (X1) is defined as a radial direction (R), The second rotating body (2) is disposed on the outside of the first rotating body (1) in the radial direction (R), The engaging device (4) includes a first engaged portion (5) provided on the outer peripheral surface of the first rotating body (1), a second engaged portion (6) provided on the inner peripheral surface of the second rotating body (2), and an engaging member (7), The first engaged portion (5) and the second engaged portion (6) are arranged so as to overlap each other when viewed in the radial direction (R), The engaging member (7) includes a first engaging portion (71) that engages with the first engaged portion (5) and a second engaging portion (72) that engages with the second engaged portion (6), As the engaging member (7) moves in the axial direction (L), the engaging device (4) changes state between a first state in which the first engaging portion (71) engages with the first engaged portion (5) and the second engaging portion (72) engages with the second engaged portion (6), and a second state in which the first engaging portion (71) and the first engaged portion (5) are disengaged and / or the second engaging portion (72) and the second engaged portion (6) are disengaged.

[0071] According to this configuration, the first rotating body (1), which rotates integrally with the third rotating element (E3) of the distribution differential gear mechanism (SP), is disposed radially inward (R) of the second rotating body (2), which rotates integrally with the first gear (31). The first engaged portion (5) provided on the outer circumferential surface of the first rotating body (1) and the second engaged portion (6) provided on the inner circumferential surface of the second rotating body (2) are disposed so as to overlap each other as viewed in the radial direction. This makes it easier to reduce the dimension of the vehicle drive device (100) in the axial direction (L) compared to a configuration in which the first engaged portion (5) and the second engaged portion (6) are disposed so as to be aligned in the axial direction (L). Furthermore, according to this configuration, the engaging member (7) includes a first engaging portion (71) that engages with the first engaged portion (5) and a second engaging portion (72) that engages with the second engaged portion (6). The engaging member (7) moves in the axial direction (L), thereby changing the engagement state of the engaging device (4). As a result, even in the configuration in which the first engaged portion (5) and the second engaged portion (6) overlap each other when viewed in the radial direction as described above, the first rotating body (1) and the second rotating body (2) can be appropriately engaged and disengaged. As described above, according to this configuration, even in a configuration in which an engagement device (4) that disconnects power transmission from the second rotating electric machine (MG2) to the distribution differential gear mechanism (SP) side is provided, it is easy to achieve miniaturization of the vehicle drive device (100).

[0072] Here, a second bearing (B2) is further provided, which is arranged so as to be in contact with the outer peripheral surface of the second rotating body (2) and supports the second rotating body (2) from the outside in the radial direction (R), It is preferable that the second bearing (B2) is arranged so as to overlap at least one of the first engaged portion (5) and the second engaged portion (6) when viewed in the radial direction.

[0073] According to this configuration, the second bearing (B2) supports the second rotating body (2) from the outside in the radial direction (R), so that the second engaged portion (6) provided on the inner peripheral surface of the second rotating body (2) and the second bearing (B2) can be arranged to overlap each other in the radial direction. Furthermore, since the second bearing (B2) is arranged to overlap with at least one of the first engaged portion (5) and the second engaged portion (6) in the radial direction, it is easier to keep the dimension of the vehicle drive device (100) in the axial direction (L) small compared to a configuration in which the second bearing (B2) does not overlap with either the first engaged portion (5) or the second engaged portion (6) in the radial direction.

[0074] The rotor further includes a first bearing (B1) that is arranged to be in contact with the inner peripheral surface of the first rotor (1) and supports the first rotor (1) from the inside in the radial direction (R), It is preferable that the first bearing (B1) is arranged so as to overlap at least one of the first engaged portion (5) and the second engaged portion (6) when viewed in the radial direction.

[0075] According to this configuration, the first bearing (B1) supports the first rotating body (1) from the inside in the radial direction (R), so that the first engaged portion (5) provided on the outer peripheral surface of the first rotating body (1) and the first bearing (B1) can be arranged to overlap each other in the radial direction. Furthermore, since the first bearing (B1) is arranged to overlap with at least one of the first engaged portion (5) and the second engaged portion (6) in the radial direction, it is easier to keep the dimension of the vehicle drive device (100) in the axial direction (L) small compared to a configuration in which the first bearing (B1) does not overlap with both the first engaged portion (5) and the second engaged portion (6) in the radial direction.

[0076] The engaging member (7) is configured to move in the axial direction (L) while maintaining a state in which the first engaging portion (71) is engaged with the first engaged portion (5), A side of the axial direction (L) on which the first rotor (RT1) is disposed relative to the distribution differential gear mechanism (SP) is defined as an axial first side (L1), The first engaged portion (5) includes an extending portion (51) disposed on the first axial side (L1) of the second engaged portion (6), It is preferable that the extension portion (51) is arranged on the first axial side (L1) of the first gear (31) and between the distribution differential gear mechanism (SP) and the first rotor (RT1) in the axial direction (L).

[0077] According to this configuration, the first engaged portion (5) has an extending portion (51) that is located closer to the first axial side (L1) than the second engaged portion (6). This makes it easier to ensure a range of movement of the engaging member (7) in the axial direction (L) while maintaining the first engaging portion (71) engaged with the first engaged portion (5). Furthermore, since it is easy to increase the engagement range between the first engaging portion (71) and the first engaged portion (5) in the axial direction (L), it is easier to restrict the inclination of the engaging member (7). Furthermore, according to this configuration, the extension portion (51) is disposed on the first axial side (L1) with respect to the first gear (31) and between the distribution differential gear mechanism (SP) and the first rotor (RT1) in the axial direction (L). This makes it possible to use the space between the distribution differential gear mechanism (SP) and the first rotor (RT1) in the axial direction (L) to dispose the engagement member (7) and the drive mechanism (8) for moving the engagement member (7) in the axial direction (L). [Industrial Applicability]

[0078] The technology disclosed herein can be used in a vehicle drive device that includes an input member that is drivingly connected to an internal combustion engine, an output member that is drivingly connected to wheels, a distribution differential gear mechanism, a first rotating electric machine, and a second rotating electric machine. [Explanation of symbols]

[0079] 100: vehicle drive device, I: input member, O: output member, MG1: first rotating electric machine, ST1: first stator, RT1: first rotor, MG2: second rotating electric machine, ST2: second stator, RT2: second rotor, SP: distribution differential gear mechanism, E1: first rotating element, E2: second rotating element, E3: third rotating element, PT: power transmission mechanism, 1: first rotating body, 2: second rotating body, 31: first gear, 32: second gear, 4: engagement device, 5: first engaged part, 51: extension part, 6: second engaged part, 7: engagement member, 71: first engaging part, 72: second engaging part, B1: first bearing, B2: second bearing, EG: internal combustion engine, W: wheel, L: axial direction, L1: first axial side, L2: second axial side, R: radial direction

Claims

1. an input member drivingly connected to the internal combustion engine; an output member drivingly connected to the wheels; a first rotating electric machine including a first rotor; a second rotating electric machine including a second rotor; a distribution differential gear mechanism including a first rotating element, a second rotating element, and a third rotating element; A vehicle drive device including a power transmission mechanism, the first rotating element is drivingly connected to the first rotor; the second rotational element is drivingly connected to the input member; the third rotation element is drivingly connected to the output member and the second rotor via the power transmission mechanism, the first rotating electric machine and the distribution differential gear mechanism are disposed on a first axis which is a rotation axis of the input member, The power transmission mechanism includes: a first rotating body that rotates integrally with the third rotating element; a second rotor disposed on the first axis and supported so as to be rotatable relative to the first rotor; a first gear that rotates integrally with the second rotor; a second gear rotatably supported on a second axis separate from the first axis and meshing with the first gear; a meshing type engagement device that engages and disengages the first rotating body and the second rotating body, A direction along the first axis is defined as an axial direction, and a direction perpendicular to the first axis is defined as a radial direction, the second rotating body is disposed radially outward of the first rotating body, the engaging device includes a first engaged portion provided on an outer circumferential surface of the first rotating body, a second engaged portion provided on an inner circumferential surface of the second rotating body, and an engaging member; the first engaged portion and the second engaged portion are arranged to overlap each other when viewed in the radial direction, the engaging member includes a first engaging portion that engages with the first engaged portion and a second engaging portion that engages with the second engaged portion, The engagement device changes state between a first state in which the first engagement portion engages with the first engaged portion and the second engagement portion engages with the second engaged portion as the engagement member moves in the axial direction, and a second state in which the engagement between the first engagement portion and the first engaged portion is released and / or the engagement between the second engagement portion and the second engaged portion is released.

2. a second bearing arranged in contact with an outer circumferential surface of the second rotating body and supporting the second rotating body from the outside in the radial direction; The vehicle drive device according to claim 1 , wherein the second bearing is disposed so as to overlap at least one of the first engaged portion and the second engaged portion when viewed in the radial direction.

3. a first bearing arranged in contact with an inner circumferential surface of the first rotor and supporting the first rotor from the inside in the radial direction; The vehicle drive device according to claim 1 or 2, wherein the first bearing is disposed so as to overlap at least one of the first engaged portion and the second engaged portion when viewed in the radial direction.

4. the engaging member is configured to move in the axial direction while maintaining a state in which the first engaging portion is engaged with the first engaged portion, a side on which the first rotor is disposed with respect to the distribution differential gear mechanism in the axial direction is defined as a first axial side, the first engaged portion includes an extending portion that is disposed on a first side in the axial direction relative to the second engaged portion, 3. The vehicle drive device according to claim 1, wherein the extension portion is disposed on the first axial side of the first gear and between the distribution differential gear mechanism and the first rotor in the axial direction.

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