Vehicle drive device
A vehicle drive device configured with reduced axial dimensions, while still having appropriate lubrication. The vehicle drive device is configured with an input shaft coupled to an engine, a rotary electric machine, and an output shaft coupled to wheels. A power transfer mechanism couples input shaft, the rotary electric machine, and the output shaft. A case houses at least the rotary electric machine and the power transfer mechanism. An oil reserving portion capable of reserving oil supplied by rotation of the power transfer mechanism is provided above the rotor shaft inside the case. A communication oil passage is oriented between the oil reserving portion and an inner circumferential space formed inside the rotor shaft. The rotor shaft is disposed to be inserted into the inside housing space, and has a supply communication hole that communicates between the inner circumferential space and the inside housing space.
1. A vehicle drive device, comprising
an input shaft drivably coupled to an internal combustion engine,
a rotary electric machine,
an output shaft drivably coupled to wheels,
a power transfer mechanism that drivably couples the input shaft, the rotary electric machine, and the output shaft, and
a case that houses at least the rotary electric machine and the power transfer mechanism, wherein:
the rotary electric machine includes a rotor and a cylindrical rotor shaft disposed coaxially with the input shaft to support the rotor;
the power transfer mechanism includes a cylindrical member and an inside gear mechanism provided on a side in a first axial direction, which corresponds to one side in an axial direction, with respect to the rotor;
the inside gear mechanism meshes with internal teeth provided on an inner peripheral face of the cylindrical member, and is housed in an inside housing space formed on a radially inner side of the cylindrical member;
the cylindrical member is rotatably supported from a radially inner side by two support bearings disposed on both sides in the axial direction across the inside gear mechanism;
an oil reserving portion capable of reserving oil supplied by rotation of the power transfer mechanism is provided above the rotor shaft inside the case;
a communication oil passage that communicates between the oil reserving portion and an inner circumferential space formed inside the rotor shaft is provided; and
the rotor shaft is disposed to be inserted into the inside housing space, and has a supply communication hole that communicates between the inner circumferential space and the inside housing space.
2. The vehicle drive device according to claim 1 , wherein:
the rotor shaft has a shaft-end opening portion provided at an end portion on a side in a second axial direction which is opposite to the first axial direction;
the case includes an end-portion support wall that supports an end portion of the rotor shaft on the side in the second axial direction;
the communication oil passage includes a first communication oil passage that extends in the axial direction from the oil reserving portion toward the end-portion support wall, and a second communication oil passage formed in the end-portion support wall to extend in a radial direction from the first communication oil passage toward the rotor shaft; and
a radially inner end portion of the second communication oil passage communicates with the inner circumferential space via the shaft-end opening portion.
3. The vehicle drive device according to claim 2 , wherein:
the inside gear mechanism forms a part of a planetary gear mechanism, and includes a plurality of pinion gears that mesh with the internal teeth and a carrier that rotatably supports the plurality of pinion gears; and
an oil collecting portion is provided at a side surface of the carrier on a side on which the supply communication hole is provided, the oil collecting portion having an oil collecting opening portion that opens toward a radially inner side and being capable of collecting oil supplied from the supply communication hole, and pinion supply oil passages are provided inside pinion shafts that rotatably support the pinion gears via pinion bearings, respectively, the pinion supply oil passages communicating between the oil collecting portion and the pinion bearings.
4. The vehicle drive device according to claim 3 , wherein:
the case includes an intermediate support wall that extends in a radial direction between the rotor and the cylindrical member in the axial direction, and a tubular support projecting portion that projects from the intermediate support wall toward the side in the first axial direction, the support projecting portion being formed to support a subject support bearing, which is one of the support bearings on a side in a second axial direction which is opposite to the first axial direction, from a radially inner side;
a radially outer opening portion of the supply communication hole is disposed radially inward of the support projecting portion and at a position at which the opening portion partially overlaps the support projecting portion as seen in the radial direction; and
an inner peripheral face of the support projecting portion is formed to expand in diameter toward the oil collecting portion.
5. The vehicle drive device according to claim 4 , wherein:
the subject support bearing and the oil collecting portion are disposed with a predetermined clearance between the subject support bearing and the oil collecting portion in the axial direction; and
the support projecting portion includes an extended projecting portion that projects in the axial direction toward the oil collecting portion further than a side surface of the subject support bearing on the side in the first axial direction.
6. The vehicle drive device according to claim 5 , wherein
an end portion of the oil collecting opening portion on the side in the second axial direction is positioned radially outward of an end portion of the extended projecting portion on the side in the first axial direction, and positioned at the same position as or on the side in the second axial direction with respect to an end portion of the extended projecting portion on the side in the first axial direction in the axial direction.
7. The vehicle drive device according to claim 6 , wherein:
the cylindrical member has a discharge communication hole that communicates between a discharge opening portion formed in an inner peripheral face of the cylindrical member and an outer peripheral face of the cylindrical member; and
the discharge opening portion is disposed across meshing portions of the internal teeth and the inside gear mechanism from the supply communication hole.
8. The vehicle drive device according to claim 7 , wherein
the internal teeth are inclined with respect to a direction parallel to the axial direction so as to be directed in a rotational direction of the cylindrical member with a vehicle traveling forward as the internal teeth extend from the discharge opening portion toward the supply communication hole in the axial direction.
9. The vehicle drive device according to claim 8 , further comprising:
a pump drive shaft inserted through a radially inner side with respect to the rotor shaft and drivably coupled to an oil pump disposed on the side in the second axial direction, which is opposite to the first axial direction, with respect to the rotor, wherein:
the pump drive shaft and the input shaft are coupled so as to rotate together with each other; and
an in-shaft oil passage through which oil discharged from the oil pump flows is formed inside the pump drive shaft, and a supply communication oil passage that communicates between the in-shaft oil passage and the inside housing space is formed inside the input shaft.
10. The vehicle drive device according to claim 1 , wherein:
the inside gear mechanism forms a part of a planetary gear mechanism, and includes a plurality of pinion gears that mesh with the internal teeth and a carrier that rotatably supports the plurality of pinion gears; and
an oil collecting portion is provided at a side surface of the carrier on a side on which the supply communication hole is provided, the oil collecting portion having an oil collecting opening portion that opens toward a radially inner side and being capable of collecting oil supplied from the supply communication hole, and pinion supply oil passages are provided inside pinion shafts that rotatably support the pinion gears via pinion bearings, respectively, the pinion supply oil passages communicating between the oil collecting portion and the pinion bearings.
11. The vehicle drive device according to claim 10 , wherein:
the case includes an intermediate support wall that extends in a radial direction between the rotor and the cylindrical member in the axial direction, and a tubular support projecting portion that projects from the intermediate support wall toward the side in the first axial direction, the support projecting portion being formed to support a subject support bearing, which is one of the support bearings on a side in a second axial direction which is opposite to the first axial direction, from a radially inner side;
a radially outer opening portion of the supply communication hole is disposed radially inward of the support projecting portion and at a position at which the opening portion partially overlaps the support projecting portion as seen in the radial direction; and
an inner peripheral face of the support projecting portion is formed to expand in diameter toward the oil collecting portion.
12. The vehicle drive device according to claim 11 , wherein:
the subject support bearing and the oil collecting portion are disposed with a predetermined clearance between the subject support bearing and the oil collecting portion in the axial direction; and
the support projecting portion includes an extended projecting portion that projects in the axial direction toward the oil collecting portion further than a side surface of the subject support bearing on the side in the first axial direction.
13. The vehicle drive device according to claim 12 , wherein
an end portion of the oil collecting opening portion on the side in the second axial direction is positioned radially outward of an end portion of the extended projecting portion on the side in the first axial direction, and positioned at the same position as or on the side in the second axial direction with respect to an end portion of the extended projecting portion on the side in the first axial direction in the axial direction.
14. The vehicle drive device according to claim 13 , wherein:
the cylindrical member has a discharge communication hole that communicates between a discharge opening portion formed in an inner peripheral face of the cylindrical member and an outer peripheral face of the cylindrical member; and
the discharge opening portion is disposed across meshing portions of the internal teeth and the inside gear mechanism from the supply communication hole.
15. The vehicle drive device according to claim 14 , wherein
the internal teeth are inclined with respect to a direction parallel to the axial direction so as to be directed in a rotational direction of the cylindrical member with a vehicle traveling forward as the internal teeth extend from the discharge opening portion toward the supply communication hole in the axial direction.
16. The vehicle drive device according to claim 15 , further comprising:
a pump drive shaft inserted through a radially inner side with respect to the rotor shaft and drivably coupled to an oil pump disposed on the side in the second axial direction, which is opposite to the first axial direction, with respect to the rotor, wherein:
the pump drive shaft and the input shaft are coupled so as to rotate together with each other; and
an in-shaft oil passage through which oil discharged from the oil pump flows is formed inside the pump drive shaft, and a supply communication oil passage that communicates between the in-shaft oil passage and the inside housing space is formed inside the input shaft.
17. The vehicle drive device according to claim 1 , wherein:
the cylindrical member has a discharge communication hole that communicates between a discharge opening portion formed in an inner peripheral face of the cylindrical member and an outer peripheral face of the cylindrical member; and
the discharge opening portion is disposed across meshing portions of the internal teeth and the inside gear mechanism from the supply communication hole.
18. The vehicle drive device according to claim 1 , further comprising:
a pump drive shaft inserted through a radially inner side with respect to the rotor shaft and drivably coupled to an oil pump disposed on the side in the second axial direction, which is opposite to the first axial direction, with respect to the rotor, wherein:
the pump drive shaft and the input shaft are coupled so as to rotate together with each other; and
an in-shaft oil passage through which oil discharged from the oil pump flows is formed inside the pump drive shaft, and a supply communication oil passage that communicates between the in-shaft oil passage and the inside housing space is formed inside the input shaft.
19. The vehicle drive device according to claim 2 , wherein:
the cylindrical member has a discharge communication hole that communicates between a discharge opening portion formed in an inner peripheral face of the cylindrical member and an outer peripheral face of the cylindrical member; and
the discharge opening portion is disposed across meshing portions of the internal teeth and the inside gear mechanism from the supply communication hole.
20. The vehicle drive device according to claim 2 , further comprising:
a pump drive shaft inserted through a radially inner side with respect to the rotor shaft and drivably coupled to an oil pump disposed on the side in the second axial direction, which is opposite to the first axial direction, with respect to the rotor, wherein:
the pump drive shaft and the input shaft are coupled so as to rotate together with each other; and
an in-shaft oil passage through which oil discharged from the oil pump flows is formed inside the pump drive shaft, and a supply communication oil passage that communicates between the in-shaft oil passage and the inside housing space is formed inside the input shaft.