JP5853397B2 - Hybrid vehicle drive device - Google Patents

Description

  The present invention relates to a hybrid vehicle drive device.

  2. Description of the Related Art Conventionally, as described in, for example, Patent Document 1, in a series parallel type hybrid vehicle drive device, an engine among planetary gears as a power split mechanism that splits and transmits power from an engine to an output shaft and a generator. There is known a configuration in which a one-way clutch is connected to a carrier to be connected to the carrier. In this configuration, when the generator is driven as an electric motor when the engine is stopped, the reverse rotation of the engine is prevented by the one-way clutch, and the output of the generator can be transmitted to the output shaft side. Driving power can be enhanced by simultaneous output.

JP 2002-103999 A

  However, in the conventional hybrid vehicle drive device disclosed in Patent Document 1, each component such as a one-way clutch, a planetary gear, a counter gear, and a bearing is arranged in series on the same axis. There is a possibility that the total length in the axial direction of the drive device may increase as compared with a configuration in which the drive device is not provided. If the total length of the drive device in the axial direction increases, the size of the drive device increases, and the installation space is likely to be restricted.

  The present invention has been made in view of the above circumstances, and provides a drive device for a hybrid vehicle that can suppress an increase in the overall length in the axial direction even when a one-way clutch is coupled to a planetary gear carrier. With the goal.

The present invention includes a planetary gear having a carrier coupled to an engine, a sun gear coupled to a generator, and a ring gear coupled to a counter gear, a one-way clutch coupled between the carrier and the case of the device, In the hybrid vehicle drive device in which the counter gear is coaxially disposed, the ring gear is provided on the inner peripheral surface, the counter gear is provided on the outer peripheral surface, and the cylindrical member integrally formed with the ring gear and the counter gear; Two bearings that respectively support the cylindrical member at both axial ends of the cylindrical member, and one of the bearings is arranged to support the cylindrical member from a radially inner side of the cylindrical member. The other of the bearings is arranged to support the cylindrical member from the outside in the radial direction of the cylindrical member. Is the one-way clutch is in the one bearing the axially opposite side of the sandwich said ring gear, while being disposed radially inwardly of said cylindrical member, is disposed between the ends of the axial direction of the cylindrical member characterized in that that.

  In the above hybrid vehicle drive device, it is preferable that the planetary gear, the one-way clutch, and a parking gear arranged coaxially with the counter gear are provided on the outer peripheral surface of the cylindrical member.

  In the hybrid vehicle drive device according to the present invention, the counter gear on the outer peripheral surface side of the cylindrical member, and the ring gear, the bearing, and the one-way clutch on the inner peripheral surface side of the cylindrical member can be arranged overlapping in the axial direction. It becomes possible. Thereby, even if it is the structure which connected the one-way clutch to the carrier of the planetary gear, there exists an effect that it can suppress that the full length of an axial direction increases.

FIG. 1 is a cross-sectional view showing a schematic configuration of a hybrid vehicle drive device according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a schematic configuration of a hybrid vehicle drive device according to a modification of the present embodiment.

  Embodiments of a hybrid vehicle drive device according to the present invention will be described below with reference to the drawings. In the following drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated.

  First, with reference to FIG. 1, the structure of the hybrid vehicle drive device 1 which concerns on this embodiment is demonstrated. FIG. 1 is a cross-sectional view showing a schematic configuration of a hybrid vehicle drive device 1 according to an embodiment of the present invention.

  As shown in FIG. 1, a hybrid vehicle drive device (hereinafter referred to as “drive device”) 1 according to the present embodiment is a drive device used in a series-parallel hybrid vehicle. The planetary gear 2 that functions as a power split mechanism that splits and transmits the output to the generator and the output shaft side and the one-way clutch 3 that prevents reverse rotation of the engine are arranged coaxially. In the example shown in FIG. 1, the engine is disposed on the right side of the illustrated portion and is connected to the engine output shaft 4. The generator is disposed on the left side of the illustrated portion, and the rotor shaft 5 extends in the drawing from the left side of the drawing.

  The drive device 1 further includes a motor (not shown) on another shaft, and the output of the motor and the output of the engine divided by the planetary gear 2 are transmitted to the output shaft connected to the wheels. Take the configuration. Note that the “motor” and “generator” of the present embodiment both selectively function as an electric motor (motor) that generates drive torque and function as a generator (generator) that generates electric power. A motor generator that can be operated, and the functions of both are appropriately switched depending on the driving state of the hybrid vehicle. For convenience, in the description of the present embodiment, a motor generator (electric motor) connected to the planetary gear 2 is used. It is expressed as “generator”.

  The planetary gear 2 is a single-pinion type planetary gear mechanism including a sun gear 21, a carrier 22, and a ring gear 23, and a pinion gear 24 is disposed between the sun gear 21 disposed on the radially inner side and the ring gear 23 disposed on the radially outer side. Are engaged with each other, and a carrier 22 is connected to the pinion gear 24. In this drive device 1, the sun gear 21, the carrier 22, and the ring gear 23 are connected to the generator, the engine, and the output shaft side, respectively. In the example shown in FIG. 1, the carrier 22 of the planetary gear 2 is connected to the engine output shaft 4, and the engine output shaft 4 is connected to the engine on the right side of the figure. The sun gear 21 of the planetary gear 2 is spline-connected to the rotor shaft 5 of the generator. The ring gear 23 is connected to the output shaft via a counter drive gear (counter gear) 6 (the relationship between the ring gear 23 and the counter drive gear 6 will be described later).

  The one-way clutch 3 is connected to the carrier 22 of the planetary gear 2 so as to prevent the engine connected to the carrier 22 from rotating in the reverse rotation direction. The one-way clutch 3 includes an outer race 31 on the radially outer side and an inner race 32 on the radially inner side, and the outer race 31 and the inner race 32 are coupled to be slidable in one direction around the axis. The outer race 31 is connected and fixed to the inner wall 71 of the case 7 of the drive device 1, and the inner race 32 is connected to the carrier 22 of the planetary gear 2.

  Here, in the example shown in FIG. 1, a cylindrical protrusion 72 that extends in the axial direction from a predetermined radial position of the inner wall 71 of the case 7 is provided. The outer race 31 has an inner peripheral surface 31 a disposed opposite to the outer peripheral surface 72 a of the projecting portion 72, and the inner peripheral surface 31 a is spline-fitted with the outer peripheral surface 72 a of the projecting portion 72 by the snap ring 13. Thus, it is connected and fixed to the inner wall 71 of the case 7.

  In the one-way clutch 3, when the generator is driven as an electric motor when the engine is stopped, the carrier 22 connected to the pinion gear 24 is rotated by the driving force transmitted from the sun gear 21 connected to the generator to the pinion gear 24. Thus, the driving force of the generator can be transmitted to the ring gear 23 and transmitted to the output shaft side, so that the motor and the generator can output simultaneously.

  In particular, in the present embodiment, the ring gear 23 of the planetary gear 2 is provided on the inner peripheral surface 81 of a cylindrical composite gear (cylindrical member) 8 disposed radially outside the sun gear 21 and the carrier 22. The composite gear 8 is a cylindrical member extending on both sides in the axial direction with the ring gear 23 as a reference. The composite gear 8 is further provided with a counter drive gear 6 and a parking gear 9 on its outer peripheral surface 82. Thus, the composite gear 8 integrally forms the ring gear 23 of the planetary gear 2, the counter drive gear 6, and the parking gear 9.

  In the example shown in FIG. 1, in the composite gear 8, the counter drive gear 6 is provided at the end of the outer peripheral surface 82 on the engine side (right direction in FIG. 1) in the axial direction from the ring gear 23. It is provided on the outer peripheral surface 82 on the generator side (left direction in FIG. 1) in the axial direction, and is arranged in series in the order of the parking gear 9, the ring gear 23, and the counter drive gear 6 along the axial direction. . The parking gear 9, the ring gear 23, and the counter drive gear 6 are arranged so as not to overlap in the radial direction.

  The composite gear 8 is supported at both ends in the axial direction by two radial bearings 10 and 11 (hereinafter referred to as “bearings”). One of the two bearings 10, 11, more specifically the bearing 10 disposed at the end on the engine side, is disposed so as to support the composite gear 8 from the radially inner side of the composite gear 8. The bearing 10 supports the composite gear 8 by contacting the inner peripheral surface 81 of the composite gear 8 at the outer race 10a, and is supported by the case 7 by contacting the inner wall 71 of the case 7 by the inner race 10b. . In the example shown in FIG. 1, the counter drive gear 6 is provided at the engine side end of the composite gear 8 as described above, so the bearing 10 is disposed on the radially inner side of the counter drive gear 6.

  On the other hand, the other bearing 11 arranged at the end on the generator side is arranged to support the composite gear 8 from the radially outer side of the composite gear 8. The bearing 11 supports the composite gear 8 by contacting the outer peripheral surface 82 of the composite gear 8 at the inner race 11b, and is supported by the case 7 by contacting the inner wall 71 of the case 7 by the outer race 11a. . In addition, the parking gear 9 is provided adjacent to the counter drive gear 6 side in the axial direction from the bearing 11.

  As described above, the bearings 10 and 11 are disposed so as to overlap (overlap) the composite gear 8 in the radial direction view.

  Furthermore, on the generator side of the composite gear 8, that is, on the opposite side to the bearing 10 in the axial direction across the ring gear 23, the bearing 11 supports the composite gear 8 from the outside in the radial direction. A cylindrical groove 12 having an inner diameter larger than that of the ring gear 23 can be provided between the end surface and the ring gear 23. In particular, in the present embodiment, the one-way clutch 3 is disposed so as to be housed in the cylindrical groove 12, and is disposed on the radially inner side of the composite gear 8 so as to overlap the composite gear 8 when viewed in the radial direction. Yes. Further, the one-way clutch 3 and the parking gear 9 of the composite gear 8 are arranged so as to face each other in the radial direction and at least partially overlap.

  Next, the effect of the hybrid vehicle drive device 1 according to the present embodiment will be described.

  In the hybrid vehicle drive device 1 according to the present embodiment, the composite gear 8 includes the ring gear 23 of the planetary gear 2 on the inner peripheral surface 81, the counter drive gear 6 on the outer peripheral surface 82, and the ring gear 23 and the counter drive gear 6. It is formed integrally. In addition, one of the bearings 10 and 11 that support the composite gear 8 at both ends in the axial direction of the composite gear 8 is disposed so as to support the composite gear 8 from the radially inner side of the composite gear 8. Further, the one-way clutch 3 connected to the carrier 22 of the planetary gear 2 is disposed radially inward of the composite gear 8 on the opposite side of the bearing 10 in the axial direction with the ring gear 23 interposed therebetween.

  With such a configuration, the hybrid vehicle drive device 1 according to this embodiment includes the counter drive gear 6 on the outer peripheral surface 82 side of the composite gear 8, the ring gear 23 on the inner peripheral surface 81 side of the composite gear 8, the bearing 10, And it becomes possible to arrange | position the one-way clutch 3 overlappingly along an axial direction. Thereby, even in the case of the configuration in which the one-way clutch 3 is connected to the carrier 22 of the planetary gear 2, it is possible to suppress an increase in the overall length in the axial direction.

  In the hybrid vehicle drive device 1 according to this embodiment, the other bearing 11 of the bearings 10 and 11 that support the composite gear 8 is arranged to support the composite gear 8 from the radially outer side of the composite gear 8. The With this configuration, a space for disposing the bearing 11 on the radially inner side of the composite gear 8 is not required, and the bearing 11, the composite gear 8, and the one-way clutch 3 can be disposed in an overlapping manner in the radial direction. An increase in the total length in the direction can be further suppressed.

  In the hybrid vehicle drive device 1 according to the present embodiment, the planetary gear 2, the one-way clutch 3, and the parking gear 9 disposed coaxially with the counter drive gear 6 are provided on the outer peripheral surface 82 of the composite gear 8. With this configuration, in addition to the counter drive gear 6 described above, the parking gear 9 is also disposed so as to overlap the ring gear 23 on the inner peripheral surface 81 side of the composite gear 8, the bearing 10, and the one-way clutch 3 along the axial direction. Therefore, it is possible to further suppress an increase in the overall axial length of the hybrid vehicle drive device 1.

  Next, a modification of the present embodiment will be described with reference to FIG. FIG. 2 is a cross-sectional view showing a schematic configuration of a hybrid vehicle drive device 40 according to a modification of the present embodiment. In the above embodiment, the outer race 31 of the one-way clutch 3 is spline-fitted to the case 7 by the snap ring 13 and the axial position thereof is restricted, but as shown in FIG. A thrust bearing 41 may be arranged. In the example shown in FIG. 2, the thrust bearing 41 supports the outer race 31 of the one-way clutch 3 by contacting the end surface 33 of the outer race 31 of the one-way clutch 3 with one race 41a, and the other race 41b. Therefore, the composite gear 8 is supported by the composite gear 8 in contact with the bottom surface 42 of the cylindrical groove 12 of the composite gear 8. With this configuration, the axial position of the outer race 31 of the one-way clutch 3 can be restricted as in the above embodiment, and the detachability of the one-way clutch 3 can be improved.

  As mentioned above, although preferred embodiment was shown and demonstrated about this invention, this invention is not limited by these embodiment.

1,40 Hybrid vehicle drive device 2 Planetary gear 21 Sun gear 22 Carrier 23 Ring gear 3 One-way clutch 6 Counter drive gear (counter gear)
9 Parking gear 10 Radial bearing (one bearing)
11 Radial bearing (the other bearing)
8 Compound gear (cylindrical member)
81 Inner peripheral surface of compound gear (inner peripheral surface of cylindrical member)
82 Outer peripheral surface of compound gear (outer peripheral surface of cylindrical member)

Claims (2)

A planetary gear having a carrier coupled to the engine, a sun gear coupled to the generator, and a ring gear coupled to the counter gear, a one-way clutch coupled between the carrier and the case of the device, and the counter gear In the hybrid vehicle drive device arranged coaxially,
A cylindrical member in which the ring gear is provided on an inner peripheral surface, the counter gear is provided on an outer peripheral surface, and the ring gear and the counter gear are integrally formed;
Two bearings respectively supporting the cylindrical member at both axial ends of the cylindrical member;
With
One of the bearings is arranged to support the cylindrical member from the inside in the radial direction of the cylindrical member,
The other bearing among the bearings is arranged to support the cylindrical member from the outside in the radial direction of the cylindrical member,
The one-way clutch is disposed on the radially opposite side of the cylindrical member on the opposite side of the one bearing with respect to the ring gear, and is disposed between both ends of the cylindrical member in the axial direction. A hybrid vehicle drive device characterized by the above.   2. The hybrid vehicle drive device according to claim 1, wherein the planetary gear, the one-way clutch, and a parking gear arranged coaxially with the counter gear are provided on the outer peripheral surface of the cylindrical member.

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