Hybrid Drive Unit

Abstract

This increases the degree of freedom in arranging the engagement drive source that drives the engagement member. [Solution] The hybrid drive device includes a power transmission mechanism T, and the power transmission mechanism T includes a meshing engagement device 4, and the engagement device 4 includes an engagement member 5 and an engagement drive mechanism 6, and the engagement drive mechanism 6 includes an engagement drive source and an engagement power transmission mechanism. The engagement drive source is disposed radially outward of the target rotating electric machine and in a position overlapping with the target rotating electric machine as viewed in the radial direction Y, and the engagement power transmission mechanism 6 includes a transmission member 611 extending along the axial direction X and is configured to drivably couple the engagement drive source and the engagement member 5 via the transmission member 611.

Description

[Technical Field]

[0001] The present invention relates to a hybrid drive device comprising an input member drivingly connected to an internal combustion engine, a first rotating electric machine arranged on a first axis, a second rotating electric machine arranged on a second axis parallel to but different from the first axis, an output member drivingly connected to wheels, and a power transmission mechanism that transmits driving force between the first rotating electric machine, the input member, the second rotating electric machine, and the output member. [Background technology]

[0002] For example, International Publication No. 2019-194078 (Patent Document 1) discloses a motor unit mounted on a hybrid vehicle, etc. The reference numerals in parentheses used in the following description of the background art are those of Patent Document 1.

[0003] The motor unit (10) disclosed in Patent Document 1 includes a power transmission mechanism (5) that transmits driving force generated by a driving source, and a clutch (6). The clutch (6) can connect or disconnect components to each other. This allows the transmission path of the driving force to be freely switched, enabling multiple driving modes to be realized.

[0004] An actuator 69 is used to operate the clutch 6. The actuator 69 requires an engagement drive source for engaging / disengaging the clutch 6, but the location of this engagement drive source is likely to be restricted by the connection structure between the motor unit 10 and the engine 2 and the location of the power transmission mechanism 5. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2019-194078 Summary of the Invention [Problem to be solved by the invention]

[0006] Therefore, it is desired to realize a technology that can increase the degree of freedom in the arrangement of the engagement drive source that drives the engagement member. [Means for solving the problem]

[0007] an input member drivingly connected to the internal combustion engine; a first rotating electric machine disposed on a first axis; a second rotating electric machine disposed on a second axis that is parallel to and different from the first axis; an output member drivingly connected to the wheels; a power transmission mechanism that transmits driving force among the first rotating electric machine, the input member, the second rotating electric machine, and the output member; A hybrid drive unit comprising: one of the first rotating electric machine and the second rotating electric machine is a target rotating electric machine, A direction parallel to a target axis, which is an axis on which the target rotating electric machine is arranged, is defined as an axial direction, and a direction perpendicular to the target axis is defined as a radial direction, the power transmission mechanism is disposed on a first axial side, which is one side in the axial direction, with respect to the target rotating electric machine; the power transmission mechanism includes a meshing engagement device; The engagement device is an engaging member that is disposed on the first axial side of the target rotating electric machine and that moves in the axial direction to switch an engagement state with a rotating member that constitutes the power transmission mechanism; an engagement drive mechanism that drives the engagement member; Equipped with the engagement drive mechanism includes an engagement drive source and an engagement power transmission mechanism that transmits the drive force of the engagement drive source to the engagement member; the engagement drive source is disposed at a position that is radially outward of the target rotating electric machine and overlaps with the target rotating electric machine as viewed in the radial direction, The engagement power transmission mechanism includes a transmission member extending along the axial direction, and is configured to drive-couple the engagement drive source and the engagement member via the transmission member.

[0008] This configuration allows the engagement drive source to be disposed at a position axially separated from the engagement member. This also allows the engagement drive source to be disposed using space radially outward from the target rotating electrical machine. Therefore, this configuration facilitates increased flexibility in the placement of the engagement drive source.

[0009] Further features and advantages of the techniques according to the present disclosure will become more apparent from the following description of exemplary and non-limiting embodiments, which proceeds with reference to the drawings. [Brief explanation of the drawings]

[0010] [Figure 1] Skeleton diagram showing the general configuration of a hybrid drive system [Figure 2] Schematic diagram of a hybrid drive system viewed from the axial direction [Figure 3] Enlarged cross-sectional view showing part of the hybrid drive system [Figure 4] Perspective view of an engagement device DETAILED DESCRIPTION OF THE INVENTION

[0011] [Definition] In the description of this embodiment, the following definitions are used.

[0012] The term "rotating electric machine" is used as a concept that includes motors (electric motors), generators (electric generators), and motor-generators that function as both motors and generators as needed.

[0013] 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 is used as a concept that 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. Such 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 each rotating element of a planetary gear mechanism, it refers to a state in which the rotating elements are connected so as to be able to transmit a driving force without passing through other rotating elements of the planetary gear mechanism.

[0014] "With regard to the arrangement of two components, they overlap when viewed from a specific 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 an area where the imaginary line intersects both of the two components.

[0015] Either the first rotating electric machine or the second rotating electric machine is defined as the target rotating electric machine. The direction parallel to the target axis, which is the axis on which the target rotating electric machine is arranged, is defined as the "axial direction X". One side of the axial direction X is defined as the "first axial side X1". The other side of the axial direction X is defined as the "second axial side X2". The direction perpendicular to the target axis is defined as the "radial direction Y". The inside of the radial direction Y is defined as the "radial inner side Y1". The outside of the radial direction Y is defined as the "radial outer side Y2". The direction going around the target axis is defined as the "circumferential direction Z".

[0016] Hereinafter, an embodiment of a hybrid drive device will be described with reference to the drawings.

[0017] As shown in FIG. 1 , the hybrid drive system 100 includes an input member 98 drivingly connected to an internal combustion engine 99, a first rotating electric machine MG1 disposed on a first axis Ax1, a second rotating electric machine MG2 disposed on a second axis Ax2 parallel to but different from the first axis Ax1, an output member 97a drivingly connected to wheels W, and a power transmission mechanism T that transmits driving force among the first rotating electric machine MG1, the input member 98, the second rotating electric machine MG2, and the output member 97a. In this embodiment, a countershaft 96 is disposed on a third axis Ax3. The output member 97a is disposed on a fourth axis Ax4. The first axis Ax1, the second axis Ax2, the third axis Ax3, and the fourth axis Ax4 are disposed parallel to but different from one another. In this embodiment, the target rotating electric machine is the first rotating electric machine MG1, and the target axis is the first axis Ax1. The axial direction X, the radial direction Y, and the circumferential direction Z are defined based on the first axis Ax1.

[0018] The hybrid drive system 100 can be used in vehicles such as FF (front engine, front drive) type vehicles in which the output shaft of the internal combustion engine 99 is oriented transversely to the direction of travel. The hybrid drive system 100 can be used, for example, in hybrid vehicles that can switch between a so-called split system and a series system.

[0019] The input member 98 is disposed on the first axis Ax1. In this embodiment, the input member 98 is drivingly connected to an internal combustion engine 99 via a damper 95.

[0020] The power transmission mechanism T includes a power distribution planetary gear mechanism 1 arranged on the first axis Ax1. The power transmission mechanism T also includes a differential gear mechanism 97. In this embodiment, the above-mentioned output member 97a is a component of the differential gear mechanism 97, and is drivingly connected to the drive shaft Wa. Note that the power transmission mechanism T does not include the rotor shafts of the first rotating electric machine MG1 and the second rotating electric machine MG2.

[0021] The power distribution planetary gear mechanism 1 comprises a first rotating element S drivingly connected to the first rotating electric machine MG1, a second rotating element CR drivingly connected to the input member 98, and a third rotating element R drivingly connected to the output member 97a and the second rotating electric machine MG2.

[0022] In this embodiment, the order of rotational speeds is the first rotating element S, the second rotating element CR, and the third rotating element R. The power distribution planetary gear mechanism 1 is a single-pinion planetary gear mechanism including a sun gear as the first rotating element S, a carrier as the second rotating element CR, and a ring gear as the third rotating element R. However, this is not limiting, and the power distribution planetary gear mechanism 1 may be configured as a double-pinion planetary gear mechanism in which the order of rotational speeds is the first rotating element S (sun gear), the third rotating element R (ring gear), and the second rotating element CR (carrier). Hereinafter, the first rotating element S will be simply referred to as the sun gear S. The second rotating element CR will be simply referred to as the carrier CR. The third rotating element R will be simply referred to as the ring gear R.

[0023] A first rotating electric machine MG1 is drivingly connected to the sun gear S. An internal combustion engine 99 is drivingly connected to the carrier CR. A second rotating electric machine MG2 is drivingly connected to the ring gear R via a disconnecting clutch C. The second rotating electric machine MG2 is drivingly connected to wheels W. The ring gear R is configured so that its rotation can be stopped by a brake B.

[0024] In this embodiment, the hybrid drive device 100 includes an inverter unit 2. The inverter unit 2 is configured to supply three-phase AC corresponding to U-phase, V-phase, and W-phase to each of the first rotating electric machine MG1 and the second rotating electric machine MG2.

[0025] The hybrid drive system 100 configured in this manner is switchable between a split hybrid drive mode (hereinafter referred to as "split mode") and a series hybrid drive mode (hereinafter referred to as "series mode").

[0026] When a control unit (ECU) (not shown) determines that the split mode is to be executed, the control unit controls the disengagement clutch C to be engaged and the brake B to be released. As a result, the ring gear R of the power distribution planetary gear mechanism 1, the second rotating electric machine MG2, and the wheels W are connected to each other so that they rotate in unison. In this example, these are connected via a countershaft 96.

[0027] In this split mode, during hybrid driving with the internal combustion engine 99 started, the driving force of the internal combustion engine 99 is input from the input member 98 to the carrier CR of the power distribution planetary gear mechanism 1. A portion of the driving force input to the carrier CR is transmitted to the first rotating electric machine MG1 via the sun gear S, where it is regenerated by the first rotating electric machine MG1 and charged to the battery (or power is directly supplied to the second rotating electric machine MG2). Meanwhile, regeneration by the first rotating electric machine MG1 imparts regenerative torque to the sun gear S, so that the remainder of the driving force input to the carrier CR is transmitted from the ring gear R to the wheels W via the countershaft 96. In short, the driving force of the internal combustion engine 99 is distributed to the first rotating electric machine MG1 and the countershaft 96 (wheels W) by the power distribution planetary gear mechanism 1. In this state, the second rotary electric machine MG2 outputs assist torque as needed based on the required driving force, such as the accelerator opening, and the driving force is transmitted to the counter shaft 96 and output to the wheels W.

[0028] When it is determined that the vehicle is running in EV mode, the driving rotation of the second rotating electric machine MG2 is output to the wheels W via the countershaft 96. At this time, if the disengagement clutch C is engaged, the ring gear R is rotated by the driving rotation of the second rotating electric machine MG2, but because the carrier CR is stopped due to the internal combustion engine 99 being stopped, the sun gear S and the first rotating electric machine MG1 spin freely. On the other hand, when it is determined that the vehicle is running in EV mode, the driving force is transmitted from the wheels W in the opposite direction to when the vehicle is being driven, and the driving force is regenerated by the second rotating electric machine MG2.

[0029] Incidentally, when EV driving is performed in split mode for a short period of time, for example, EV driving is enabled by the second rotating electric machine MG2 by idling the sun gear S and the first rotating electric machine MG1, but continuing this state is not good for the fuel economy (electricity cost) of the vehicle. Therefore, a control unit (not shown) determines whether to switch to series mode depending on, for example, the vehicle state and driving conditions. As a result, the control unit controls the disengagement clutch C to be released and the brake B to be engaged. Note that the vehicle state may be conditions such as the remaining charge of the battery and the water temperature. Furthermore, the driving conditions may be conditions such as when the required driving force is large and the combined output of the driving force of the internal combustion engine 99 and the driving force of the second rotating electric machine MG2 is required.

[0030] In this series mode, during drive running as EV running, the drive rotation of the second rotating electric machine MG2 is output to the wheels W, and during non-drive running, the second rotating electric machine MG2 regenerates drive force by rotating the wheels W. Furthermore, when the remaining battery charge becomes low, for example, the internal combustion engine 99 is started. Then, the carrier CR of the power distribution planetary gear mechanism 1 is rotated by the internal combustion engine 99, and since the rotation of the ring gear R is fixed by the brake B, the sun gear S and the first rotating electric machine MG1 are rotated, and power is generated by the first rotating electric machine MG1 and supplied to the battery. Then, when power generation by the first rotating electric machine MG1 becomes unnecessary, the internal combustion engine 99 is stopped again.

[0031] As shown in FIG. 2, the hybrid drive device 100 includes a case 3 that houses an input member 98, a first rotating electric machine MG1, a second rotating electric machine MG2, and a power transmission mechanism T.

[0032] The case 3 includes a peripheral wall portion 31 that surrounds the first rotating electrical machine MG1 (target rotating electrical machine) from the radially outer side Y2. In this embodiment, the peripheral wall portion 31 is formed so as to surround not only the first rotating electrical machine MG1 but also at least a portion of the second rotating electrical machine MG2.

[0033] Case 3 is The inverter accommodating portion 32 is disposed on the radially outer side Y2 of the peripheral wall portion 31 and accommodates the inverter unit 2 therein. The inverter accommodating portion 32 is configured to accommodate at least a portion of the inverter unit 2.

[0034] FIG. 3 is a cross-sectional view showing the engagement device 4 constituting the power transmission mechanism T and its surrounding structure.

[0035] 3, the case 3 includes a rotating electric machine accommodating chamber 34 that accommodates at least one of the first rotating electric machine MG1 and the second rotating electric machine MG2, and a transmission mechanism accommodating chamber 35 that accommodates at least a part of the power transmission mechanism T. The rotating electric machine accommodating chamber 34 and the transmission mechanism accommodating chamber 35 are partitioned by a partition wall 36. In the illustrated example, the transmission mechanism accommodating chamber 35 is disposed on a first axial side X1 with respect to the partition wall 36. The rotating electric machine accommodating chamber 34 is disposed on a second axial side X2 with respect to the partition wall 36.

[0036] The transmission mechanism accommodating chamber 35 accommodates a portion of the shaft-shaped input member 98, a connecting shaft 94, a ring gear support member 93, a counter member 92, a power distribution planetary gear mechanism 1, and a portion of the engagement device 4.

[0037] The connecting shaft 94 is drivingly connected to the first rotating electrical machine MG1 on the same axis (first axis Ax1). A sun gear S is formed on the connecting shaft 94.

[0038] A pinion gear P of the power distribution planetary gear mechanism 1 and a carrier CR that rotatably supports the pinion gear P are arranged on the outer periphery of the sun gear S. Of both side plates of the carrier CR, one side plate that is on the internal combustion engine 99 side in the axial direction X (first axial side X1) is fixed to an input member 98. In other words, the input member 98 and the carrier CR are drivingly connected. A ring gear R is arranged on the outer periphery of the pinion gear P. An engagement device 4 is arranged on the radially outer side Y2 of the ring gear R. In this example, the engagement device 4 is configured using a dog clutch mechanism that is a dog clutch or a dog brake.

[0039] The ring gear support member 93 is rotatably supported on the radially outer side Y2 of the connecting shaft 94. The ring gear support member 93 is formed in a substantially hollow disk shape, and the ring gear R is fixed to the end portion on the radially outer side Y2 of the ring gear support member 93.

[0040] The counter member 92 is disposed via a bearing so as to be rotatable relative to the partition wall 36. A clutch gear CG of the disengagement clutch C is fixed to the counter member 92.

[0041] The engagement device 4 includes an engagement member 5 arranged on a first axis Ax1 so as to be movable in the axial direction X, a brake gear BG, and a clutch gear CG. That is, the brake B and the release clutch C are configured as so-called meshing dog clutches. The engagement member 5 is configured to switch its state of engagement with the rotating members that constitute the power transmission mechanism T.

[0042] A brake gear BG of the brake B is fixed to the case 3. A clutch gear CG of the release clutch C is fixed to the counter member 92. In other words, the brake gear BG is disposed on the opposite side of the power distribution planetary gear mechanism 1 in the axial direction X from the clutch gear CG (first axial side X1).

[0043] The engaging member 5 is a sleeve. Internal teeth Ga are formed on the inner peripheral surface of the engaging member 5 on the radially inner side Y1. External teeth Gb are formed on the outer peripheral surface of the ring gear R on the radially outer side Y2. The engaging member 5 is configured to be movable in the axial direction X with the internal teeth Ga meshing with the external teeth Gb. That is, the engaging member 5 is disposed on the outer periphery of the ring gear R so as to overlap with the ring gear R of the power distribution planetary gear mechanism 1 when viewed in the radial direction Y.

[0044] The engaging member 5 moves to the brake gear BG side in the axial direction X (first axial side X1) and is positioned at the brake engaging position, whereby its internal teeth Ga mesh across the external teeth Gb and the brake gear BG. This engages the brake B, rendering the ring gear R non-rotatable. In this state, for example, in the series mode described above, the ring gear R does not spin freely, and the rotation of the internal combustion engine 99 is transmitted from the carrier CR to the first rotating electrical machine MG1 via the sun gear S. This enables charging using the first rotating electrical machine MG1. Note that, in this state in which the brake B is engaged, the internal teeth Ga of the engaging member 5 are separated from the clutch gear CG, and the disengagement clutch C is in a disengaged state.

[0045] On the other hand, the engaging member 5 moves toward the clutch gear CG in the axial direction X (second axial side X2) and is positioned at the clutch engaging position, whereby its internal teeth Ga mesh across the external teeth Gb and the clutch gear CG. This drivably couples the ring gear R to the counter member 92, and the counter shaft 96 (see FIG. 1) to the ring gear R via the first gear G1 and the second gear G2. In this state, for example, in the split mode described above, it is possible to transmit the driving force of the internal combustion engine 99 from the ring gear R to the wheels W via the counter shaft 96. In this state, the internal teeth Ga of the engaging member 5 are separated from the brake gear BG, and the brake B is in a released state.

[0046] The engagement device 4 includes an engagement drive mechanism 6 that drives the engagement member 5. The movement of the engagement member 5 in the axial direction X described above is realized by the engagement drive mechanism 6.

[0047] 3 and 4, the engagement drive mechanism 6 includes an engagement drive source 60 and an engagement power transmission mechanism 61 that transmits the driving force of the engagement drive source 60 to the engagement member 5. The engagement power transmission mechanism 61 includes a transmission member 611 that extends along the axial direction X, and is configured to drive-couple the engagement drive source 60 and the engagement member 5 via the transmission member 611. The engagement drive source 60 is configured using, for example, a motor.

[0048] The engagement power transmission mechanism 61 includes a connecting member 612 engaged with the engagement member 5 in a state where relative rotation with respect to the engagement member 5 is permitted while relative movement in the axial direction X is restricted, and a speed reduction mechanism 613 that reduces the speed of the driving rotation generated by the engagement drive source 60 and transmits it to the transmission member 611.

[0049] In this embodiment, the reduction gear 613 includes a rack gear 613a that is formed integrally with the transmission member 611 and extends along the axial direction X, and a pinion 613b that meshes with the rack gear 613a. In this example, the rack gear 613a is provided on a part of the transmission member 611, but it may be provided on another member that operates integrally with the transmission member 611. The engagement drive source 60 is configured to rotationally drive the pinion 613b. In this example, the engagement drive source 60 is configured to rotationally drive the pinion 613b via the reduction gear 613, but it may also be configured to rotationally drive the pinion 613b directly without going through the reduction gear mechanism 613.

[0050] The transmission member 611 is coupled to the connecting member 612. A driving force generated by the engagement drive source 60 is applied to the transmission member 611 via the speed reduction mechanism 613, so that the transmission member 611 and the connecting member 612 move integrally along the axial direction X.

[0051] Here, two flange-shaped flange portions 51, 52 are formed on the outer circumferential side of the engaging member 5 at intervals in the axial direction X (see FIG. 3). The connecting member 612 is disposed between the two flange portions 51, 52 in the axial direction X.

[0052] The connecting member 612 moves toward the first axial side X1, thereby pressing the flange portion 51, which is arranged on the first axial side X1, of the two flange portions 51, 52, toward the first axial side X1. This causes the engaging member 5 to move toward the first axial side X1, and the brake B is brought into an engaged state (the disengaged state of the disengagement clutch C).

[0053] On the other hand, by moving toward the second axial side X2, the connecting member 612 presses the flange portion 52, which is disposed on the second axial side X2, of the two flange portions 51, 52 toward the second axial side X2. As a result, the engaging member 5 moves toward the second axial side X2, and the disengagement clutch C is brought into an engaged state (the brake B is released).

[0054] For example, the engagement drive source 60 is controlled by a control unit (ECU) (not shown), whereby the switching control of the position of the engagement member 5 as described above is executed.

[0055] In this embodiment, the engagement power transmission mechanism 61 includes a detent mechanism 614 that locks the transmission member 611 at a plurality of locking positions in the axial direction X. When the transmission member 611 is locked, the connecting member 612 connected to the transmission member 611 is also locked.

[0056] The detent mechanism 614 includes a plurality of recesses 614a aligned along the axial direction X. In this embodiment, the plurality of recesses 614a are formed in the transmission member 611. The plurality of recesses 614a are arranged in a region in the axial direction X between a region in the transmission member 611 where the rack gear 613a is arranged and a region to which the connecting member 612 is coupled. The arrangement intervals of the plurality of recesses 614a correspond to the intervals between the plurality of locking positions for locking the transmission member 611 described above.

[0057] The detent mechanism 614 includes a locking portion 614b configured to be able to engage with any of the multiple recesses 614a. The locking portion 614b is biased by a biasing member such as a spring, and when the transmission member 611 moves in the axial direction X, the locking portion 614b is engaged with any of the recesses 614a that has come to the position of the locking portion 614b, using the biasing force of the biasing member.

[0058] In this way, the driving force generated by the engagement drive source 60 is transmitted to the connecting member 612, and the connecting member 612, which operates in this way, moves the engaging member 5 in the axial direction X, thereby switching the engagement state of the engaging member 5.

[0059] The engagement drive source 60 is disposed radially outwardly Y2 from the first rotating electric machine MG1 and at a position overlapping with the first rotating electric machine MG1 as viewed in the radial direction Y. The hybrid drive device 100 of this embodiment is configured to supply oil from the rotating electric machine accommodation chamber 34 (for example, oil scooped up by the rotation of the first rotating electric machine MG1 or the second rotating electric machine MG2, oil scattered from the axis, or oil passing through a lubricating oil passage) to the reduction gear mechanism 613 to lubricate the reduction gear mechanism 613 (the pinion 613b, etc.). In this regard, in the hybrid drive device 100, the engagement drive source 60 is disposed at a position overlapping with the first rotating electric machine MG1 (in other words, the rotating electric machine accommodation chamber 34) as viewed in the radial direction Y as described above, so that the oil passage for supplying oil from the rotating electric machine accommodation chamber 34 to the reduction gear mechanism 613 can be kept short. This makes it possible to simply realize a structure that satisfies the lubrication requirements of the reduction gear mechanism 613.

[0060] Also, as shown in Figure 2, At least a part of the engagement drive mechanism 6 is the outer surface of the peripheral wall portion 31 Inverter housing section 32 are attached at positions adjacent to each other in the circumferential direction Z. Inverter housing section 32 The inverter unit 2 is housed inside the case 3. For convenience of wiring to the first rotating electrical machine MG1 and the second rotating electrical machine MG2, the inverter unit 2 is preferably disposed directly above the first rotating electrical machine MG1 and the second rotating electrical machine MG2 (or at a position shifted within an allowable range from the directly above position). That is, on the outer surface of the peripheral wall portion 31 of the case 3, Engagement drive mechanism 6 than the location of inverter unit 2 ( Inverter housing section 32 In this embodiment, the arrangement position of the inverter unit 2( Inverter housing section 32 ) is arranged at a position overlapping the first rotating electric machine MG1 and the second rotating electric machine MG2 when viewed in the up-down direction, and At least a part of the engagement drive mechanism 6 However, inverter unit 2 ( Inverter housing section 32 ) in the circumferential direction Z.

[0061] 2, the right side indicates the vehicle front side Df, and the left side indicates the vehicle rear side Dr. Part of the engagement drive mechanism 6 The engagement drive source 60 is an inverter unit 2 ( Inverter housing section 32) is disposed on the vehicle front side Df. Inverter housing section 32 ), it is necessary to ensure a long transmission path for the driving force from the engagement drive source 60 to the connecting member 612 (see FIG. 4). In this case, power loss increases, making efficient operation difficult. Furthermore, because devices required for the cabin (such as an air conditioner and safety devices) are located on the vehicle rearward side Dr of the hybrid drive unit 100, it is difficult to ensure installation space for the engagement drive source 60. From this point of view, Part of the engagement drive mechanism 6 The engagement drive source 60 is an inverter unit 2 ( Inverter housing section 32 ) is preferably disposed on the vehicle front side Df.

[0062] In this embodiment, the engagement drive source 60 is an inverter unit 2 ( Inverter housing section 32 ) and is located further forward Df of the vehicle than the front case portion 33, and further rearward Dr of the vehicle than the front case portion 33. This prevents the hybrid drive unit 100 from becoming larger in the longitudinal direction of the vehicle. For example, the front case portion 33 is a boss portion for an oil cooler. Note that a radiator or the like is provided further forward Df of the front case portion 33.

[0063] Other Embodiments Next, other embodiments will be described.

[0064] (1) In the above embodiment, an example has been described in which the first rotating electric machine MG1 is the target rotating electric machine. However, the present invention is not limited to this example, and the second rotating electric machine MG2 may be the target rotating electric machine.

[0065] (2) In the above embodiment, the engagement drive source 60 accommodates the inverter unit 2. Inverter housing section 32 However, the present invention is not limited to such an example. Inverter housing section 32 The engagement drive source 60 may be disposed further rearward of the vehicle.

[0066] (3) In the above embodiment, an example has been described in which the engagement power transmission mechanism 61 includes the rack gear 613a that is formed integrally with the transmission member 611 and extends along the axial direction X, and the pinion 613b that meshes with the rack gear 613a. However, without being limited to this example, the engagement power transmission mechanism 61 may be configured to move the connecting member 612 along the axial direction X using a mechanism such as a drum mechanism, a cam mechanism, or a ball screw mechanism.

[0067] (4) In the above embodiment, an example has been described in which split mode and series mode can be realized as driving modes by connecting / disconnecting the rotating elements using the engagement device 4. However, the present invention is not limited to this example, and the position of the engagement device 4, i.e., the rotating elements that are the subject of connecting / disconnecting, can be set arbitrarily. As a result, in addition to the above-described split mode and series mode, other driving modes such as parallel mode may be realized.

[0068] (5) 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] Next, a summary of this embodiment will be described.

[0070] an input member (98) drivingly connected to an internal combustion engine (99); a first rotating electric machine (MG1) disposed on a first axis (Ax1); a second rotating electric machine (MG2) disposed on a second axis (Ax2) parallel to and different from the first axis (Ax1); an output member (97a) drivingly connected to the wheel (W); a power transmission mechanism (T) that transmits driving force among the first rotating electric machine (MG1), the input member (98), the second rotating electric machine (MG2), and the output member (97a); A hybrid drive system (100) comprising: one of the first rotating electric machine (MG1) and the second rotating electric machine (MG2) is designated as a target rotating electric machine, A direction parallel to a target axis, which is an axis on which the target rotating electric machine is arranged, is defined as an axial direction (X), and a direction perpendicular to the target axis is defined as a radial direction (Y), the power transmission mechanism (T) is disposed on a first axial side (X1) that is one side in the axial direction (X) with respect to the target rotating electric machine, The power transmission mechanism (T) includes a meshing engagement device (4), The engagement device (4) is an engaging member (5) that is disposed on the first axial side (X1) with respect to the target rotating electric machine and that moves in the axial direction (X) to switch an engagement state with a rotating member that constitutes the power transmission mechanism (T); an engagement drive mechanism (6) that drives the engagement member (5); Equipped with The engagement drive mechanism (6) includes an engagement drive source (60) and an engagement power transmission mechanism (61) that transmits the driving force of the engagement drive source (60) to the engagement member (5), the engagement drive source (60) is disposed at a position that is outside the target rotating electric machine in the radial direction (Y) and overlaps with the target rotating electric machine as viewed in the radial direction (Y), The engagement power transmission mechanism (61) includes a transmission member (611) extending along the axial direction (X) and is configured to drive-connect the engagement drive source (60) and the engagement member (5) via the transmission member (611).

[0071] According to this configuration, the engagement drive source (60) can be disposed at a position away from the engagement member (5) in the axial direction (X). This also makes it possible to effectively utilize the space formed on the radially outer side (Y2) of the target rotating electric machine to dispose the engagement drive source (60). Therefore, according to this configuration, it is easy to increase the degree of freedom in disposing the engagement drive source (60).

[0072] an inverter unit (2) arranged on the outer side of the target rotating electric machine in the radial direction (Y) and at a position overlapping with the target rotating electric machine as viewed in the radial direction (Y); a case (3) that houses the input member (98), the first rotating electric machine (MG1), the second rotating electric machine (MG2), and the power transmission mechanism (T); Further provided with The case (3) has a peripheral wall portion (31) that surrounds the target rotating electric machine from the outside in the radial direction (Y), and a wall portion (31) that protrudes from the peripheral wall portion (31) to the outside in the radial direction (Y) and accommodates the inverter unit (2) therein. Inverter housing (32) and The direction going around the symmetric axis is defined as the circumferential direction (Z), The engagement drive source (60) is Inverter housing It is preferable that the second bearing member (32) is attached at a position adjacent to the first bearing member (32) in the circumferential direction (Z).

[0073] According to this configuration, Inverter housing The space formed adjacent to the engagement drive source (60) in the circumferential direction (Z) can be effectively utilized to arrange the engagement drive source (60), which facilitates downsizing of the hybrid drive device (100).

[0074] The input member (98) is disposed on the first axis (Ax1), the power transmission mechanism (T) includes a power distribution planetary gear mechanism (1) disposed on the first axis (Ax1), The power distribution planetary gear mechanism (1) includes a first rotating element (S) drivingly connected to the first rotating electric machine (MG1); a second rotating element (CR) drivingly connected to the input member (98), and a third rotating element (R) drivingly connected to the output member (97a) and the second rotating electric machine (MG2), The engaging member (5) is disposed on the first axis (Ax1), Preferably, the target rotating electric machine is the first rotating electric machine (MG1).

[0075] According to this configuration, the engagement member (5) arranged on the first axis (Ax1) can be appropriately driven by the engagement drive mechanism (6).

[0076] The engagement power transmission mechanism (61) further includes a connecting member (612) engaged with the engagement member (5) in a state in which relative rotation with respect to the engagement member (5) is permitted and relative movement in the axial direction (X) is restricted, and a speed reduction mechanism (613) that reduces the speed of driving rotation generated by the engagement drive source (60) and transmits the driving rotation to the transmission member (611), The transmission member (611) is connected to the connection member (612) so as to move integrally with the connection member (612) in the axial direction (X), the reduction mechanism (613) includes a rack gear (613a) formed integrally with the transmission member (611) and extending along the axial direction (X), and a pinion (613b) meshing with the rack gear (613a); Preferably, the engagement drive source (60) is configured to rotate the pinion (613b).

[0077] According to this configuration, it is easy to control the amount of movement of the engagement member (5) in the axial direction (X) with high precision. Furthermore, since the reduction ratio can be easily increased, the engagement drive source (60) can be made smaller. Furthermore, since the rack gear (613a) can be formed along the axial direction (X) by utilizing the transmission member (611) extending in the axial direction (X), it is easy to make the hybrid drive device (100) smaller. [Industrial Applicability]

[0078] The technology disclosed herein can be used in a hybrid drive device that includes an input member that is drivingly connected to an internal combustion engine, a first rotating electric machine arranged on a first axis, a second rotating electric machine arranged on a second axis that is parallel to and different from the first axis, an output member that is drivingly connected to wheels, and a power transmission mechanism that transmits driving force between the first rotating electric machine, the input member, the second rotating electric machine, and the output member. [Explanation of symbols]

[0079] 100: Hybrid drive unit, 1: Power distribution planetary gear mechanism, 2: Inverter unit, 3: Case, 31: Peripheral wall portion, 32: Inverter housing , 4: engagement device, 5: engagement member, 6: engagement drive mechanism, 60: engagement drive source, 61: engagement power transmission mechanism, 611: transmission member, 612: connection member, 613: reduction mechanism, 613a: rack gear, 613b: pinion, 97a: output member, 98: input member, 99: internal combustion engine, Ax1: first shaft center, Ax2: second shaft center, MG1: first rotating electric machine, MG2: second rotating electric machine, S: first rotating element, CR: second rotating element, R: third rotating element, T: power transmission mechanism, W: wheel, X: axial direction, X1: axial first side, Y: radial direction, Z: circumferential direction

Claims

1. an input member drivingly connected to the internal combustion engine; a first rotating electric machine disposed on a first axis; a second rotating electric machine disposed on a second axis parallel to and different from the first axis; an output member drivingly connected to the wheels; a power transmission mechanism that transmits driving force among the first rotating electric machine, the input member, the second rotating electric machine, and the output member; A hybrid drive unit comprising: one of the first rotating electric machine and the second rotating electric machine is a target rotating electric machine, A direction parallel to a target axis, which is an axis on which the target rotating electric machine is arranged, is defined as an axial direction, and a direction perpendicular to the target axis is defined as a radial direction, the power transmission mechanism is disposed on a first axial side, which is one side in the axial direction, with respect to the target rotating electric machine; the power transmission mechanism includes a meshing engagement device; The engagement device is an engaging member that is disposed on the first axial side of the target rotating electric machine and that moves in the axial direction to switch an engagement state with a rotating member that constitutes the power transmission mechanism; an engagement drive mechanism that drives the engagement member; Equipped with the engagement drive mechanism includes an engagement drive source and an engagement power transmission mechanism that transmits the drive force of the engagement drive source to the engagement member; the engagement drive source is disposed at a position that is radially outward of the target rotating electric machine and overlaps with the target rotating electric machine as viewed in the radial direction, the engagement power transmission mechanism includes a transmission member extending along the axial direction, and is configured to drive-couple the engagement drive source and the engagement member via the transmission member. Hybrid drivetrain.

2. an inverter unit disposed radially outward of the target rotating electric machine and at a position overlapping with the target rotating electric machine as viewed in the radial direction; a case that accommodates the input member, the first rotating electric machine, the second rotating electric machine, and the power transmission mechanism; Further provided with the case includes a peripheral wall portion that surrounds the target rotating electric machine from the outside in the radial direction, and a protruding wall portion that is formed to protrude outward in the radial direction from the peripheral wall portion and that houses the inverter unit therein; The direction going around the symmetric axis is defined as the circumferential direction, the engagement drive source is attached to an outer surface of the peripheral wall portion at a position adjacent to the protruding wall portion in the circumferential direction; The hybrid drive system according to claim 1 .

3. the input member is disposed on the first axis; the power transmission mechanism includes a power distribution planetary gear mechanism arranged on the first axis, the power distribution planetary gear mechanism includes a first rotating element drivingly connected to the first rotating electric machine; a second rotating element drivingly connected to the input member, and a third rotating element drivingly connected to the output member and the second rotating electric machine, the engaging member is disposed on the first axis; the target rotating electric machine is the first rotating electric machine, The hybrid drive system according to claim 1 or 2.

4. the engagement power transmission mechanism further includes a connecting member engaged with the engagement member in a state in which relative rotation with respect to the engagement member is permitted and relative movement in the axial direction is restricted, and a speed reduction mechanism that reduces the speed of driving rotation generated by the engagement drive source and transmits the reduced speed to the transmission member, the transmission member is coupled to the connection member so as to move integrally with the connection member in the axial direction; the reduction mechanism includes a rack gear formed integrally with the transmission member and extending along the axial direction, and a pinion meshing with the rack gear, The engagement drive source is configured to rotationally drive the pinion. The hybrid drive system according to claim 1 or 2.

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