JP2014237333A - Lubrication structure of hybrid vehicle driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lubricate the interior of a housing without using an oil pump.SOLUTION: A lubrication structure of a hybrid vehicle driving device 14 includes: first motor generators 18 which function at least as electric generators; a power division mechanism 21 which divides power generated by an engine 12 into the first motor generators 18 and driving wheels; second motor generators 19 which separately generate power for driving the driving wheels; and a housing 20 which houses these components and stores a lubrication oil 51. The multiple first motor generators 18 and the multiple second motor generators 19 are provided and alternately disposed in a circumferential direction in the housing 20. The first motor generator 18 and the second motor generator 19 which are positioned at an inner bottom part of the housing 20 are provided so as to be immersed in an oil surface of the lubrication oil 51 stored in the housing 20.

Description

  The present invention relates to a lubrication structure for a drive device that is employed in a hybrid vehicle that includes two types of power sources having different characteristics, that is, an engine and an electric motor, and that travels with an optimal combination of driving forces according to the situation. .

  In recent years, hybrid vehicles equipped with two types of power sources having different characteristics of an engine and an electric motor have been developed and put into practical use. In this hybrid vehicle, the driving forces of the two types of power sources described above are optimally combined depending on the situation, so that the advantages of each power source are utilized to compensate for the disadvantages.

  Conventionally, various types of drive devices employed in such hybrid vehicles have been proposed. As one of them, as shown in FIG. 5, one having a first motor generator 2, a power split mechanism 3 and a second motor generator 4 has been proposed (see, for example, Patent Document 1). The first motor generator 2 mainly functions as a generator, and the power split mechanism 3 is composed of a planetary gear mechanism so that the power generated by the engine 5 is split into the first motor generator 2 and the drive wheels 6. Composed. The second motor generator 4 mainly functions as an electric motor, and generates auxiliary power for driving the drive wheels 6 separately from the power of the engine 5. Here, reference numeral 7 in FIG. 5 is a reduction gear 7 provided behind the second motor generator 4.

  The first motor generator 2, the power split mechanism 3 and the second motor generator 4 are housed in a housing (not shown), and the power split mechanism 3 is composed of a planetary gear mechanism, thereby preventing wear of the gear mechanism. From the viewpoint, the inside of the housing is lubricated. Conventionally, the lubrication is performed by so-called forced lubrication in which the oil stored in the housing is sucked by an oil pump provided in the housing and then supplied to the power split mechanism 3 for lubrication. .

JP 2003-191761 A (paragraph number “0033”, etc.)

  However, providing an oil pump necessary for lubrication inside the housing necessitates a space for accommodating the pump, which inevitably has a disadvantage that the housing is enlarged. In addition, since the oil pump is housed inside the housing, there is a problem that the unit price of the drive device obtained due to the cost of the oil pump is pushed up.

  An object of the present invention is to provide a lubrication structure for a hybrid vehicle drive device that can lubricate the inside of a housing without using an oil pump.

  The present invention provides a first motor generator that functions as an electric motor or a generator, a power split mechanism that splits power generated by the engine into the first motor generator and drive wheels, and first power that generates power for driving the drive wheels. This is a lubrication structure for a hybrid vehicle drive device that includes a two-motor generator and a housing that houses a first motor generator, a power split mechanism, and a second motor generator and stores lubricating oil.

  The characteristic configuration is that a plurality of first motor generators and second motor generators are provided and arranged alternately in the circumferential direction inside the housing, and the first motor generator and the second motor generator located at the inner bottom of the housing are It exists in the place provided so that it might be immersed in the oil surface of the lubricating oil stored inside the housing.

  When a pair of the first motor generator and the second motor generator are provided, the pair of the first motor generator and the pair of second motor generators are arranged at diagonal positions in a virtual square on the vertical plane with the bottoms horizontal. It is preferred that

  In the lubrication structure for a hybrid vehicle drive device according to the present invention, the first motor generator and the second motor generator located at the inner bottom of the housing are provided so as to be immersed in the oil surface of the lubricating oil. When the two-motor generator scoops up the lubricating oil stored in the housing, the power split mechanism existing in the housing can be lubricated without using an oil pump.

  Here, in this drive device, either the first motor generator or the second motor generator may stop, but the first motor generator and the second motor generator are provided so as to be immersed in the oil surface of the lubricating oil. Therefore, when one side stops, the other scoops up the lubricating oil, so that the inside of the housing can always be lubricated. As a result, the conventionally required oil pump for lubrication becomes unnecessary, and it is possible to avoid the increase in the size of the housing and the increase in the unit price caused by housing the pump.

It is a section lineblock diagram showing a lubrication structure of a hybrid vehicle drive device of an embodiment of the present invention. It is a perspective view which shows arrangement | positioning of the motor generator provided in each pair of the drive device for hybrid vehicles. It is a block diagram of the hybrid vehicle drive device. It is a figure which shows the relationship between the rotational speed of the engine and each motor generator. It is a block diagram of the conventional hybrid vehicle drive device.

  Next, the best mode for carrying out the present invention will be described with reference to the drawings.

  As shown in FIG. 3, the present invention is a lubrication structure of a drive device used in a hybrid vehicle 11 having a front engine rear drive (FR) type drive system. The hybrid vehicle 11 is provided with an engine 12 at a front portion and drive wheels 13 at a rear portion. Between the engine 12 and the drive wheels 13, a drive device 14, a propeller shaft 15, a differential gear 16, a pair of axle shafts 17 and the like, which are objects of lubrication of the present invention, are provided. The propeller shaft 15 is an axis that transmits the output of the driving device 14 to the differential gear 16. The differential gear 16 is a differential device that transmits power from the propeller shaft 15 to both axle shafts 17 separately. Each axle shaft 17 is an axis that transmits the power divided by the differential gear 16 to the drive wheels 13.

  The hybrid vehicle drive device 14 includes a first motor generator 18 that functions as an electric motor or a generator, a power split mechanism 21 that splits the power generated by the engine 12 into the first motor generator 18 and the drive wheels 13, and the power split thereof. Apart from the power divided into the drive wheels 13 by the mechanism 21, a second motor generator 19 that generates power for driving the drive wheels 13, the first motor generator 18, the power split mechanism 21, and the second motor generator And a housing 20 (FIG. 1) that stores the lubricating oil 51.

  The 1st motor generator 18 and the 2nd motor generator 19 are comprised by the motor which functions as an electric motor or a generator, and those functions can be switched according to a situation, for example, an AC synchronous motor. Specifically, the first motor generator 18 includes a first stator (stator) 32 and a first rotor (rotor) 33 rotatably inserted into the first stator 32, and the first stator 32 is not shown. The first rotor 33 is configured to rotate by energizing the stator coil. The second motor generator 19 also includes a second stator (stator) 39 and a second rotor (rotor) 41 that is rotatably inserted into the second stator 39. The second rotor 41 is configured to rotate by energizing the stator coil that does not.

  Here, during normal traveling of the vehicle, the first motor generator 18 mainly plays a role as a generator that generates power by the power of the engine 12. The second motor generator 19 mainly serves as an electric motor that generates auxiliary power for the engine 12. In other words, when the second motor generator 19 functions as an electric motor, it assists (assists) the power of the engine 12 as an auxiliary power source of the engine 12 as necessary to increase the driving force. The first and second motor generators 18 and 19 do not have the functions of the generator and the motor, but may have only one of the functions.

  The power split mechanism 21 appropriately splits the power of the engine 12 into a vehicle driving force for directly driving the drive wheels 13 and a power generation driving force for operating the first motor generator 18 to generate power. Mechanism. The power split mechanism 21 is constituted by a planetary gear mechanism in which a sun gear 22, a ring gear 23, and a planetary carrier 24 having the same axial center are rotatably connected.

  More specifically, the input shaft 27 is inserted into the sun gear 22 so as to be relatively rotatable. The input shaft 27 is connected to a crankshaft 29 that is an output shaft of the engine 12 via a transaxle damper 28. An auxiliary gear 26 that rotates integrally with the sun gear 22 on the input shaft 27 is connected to the sun gear 22. The auxiliary gear 26 is formed to have a larger diameter than the sun gear 22, and is configured such that a first pinion gear 35 provided on the rotary shaft 34 of the first rotor 33 of the first motor generator 18 meshes with the auxiliary gear 26. Is done. As a result, the sun gear 22 is coupled to the first motor generator 18.

  An output shaft 49 coaxial with the input shaft 27 is connected to the ring gear 23 and is rotatably supported. The output shaft 49 is connected to the drive wheel 13 via the propeller shaft 15, the differential gear 16, the axle shaft 17 and the like described above. Thereby, this ring gear 23 is connected to the drive wheel 13 through these.

  Further, the planetary carrier 24 is attached to the input shaft 27 so as to be integrally rotatable, whereby the planetary carrier 24 is configured to be rotated by the power generated by the engine 12. A pinion gear 25 is rotatably supported on the planetary carrier 24. The pinion gear 25 is located between the sun gear 22 and the ring gear 23 and is meshed between the gears 22 and 23 so as to be rotatable.

  Therefore, in the power split mechanism 21 having such a configuration, the power generated by the engine 12 and transmitted to the input shaft 27 is transmitted through the planetary carrier 24, the pinion gear 25, the sun gear 22, the auxiliary gear 26, and the first pinion gear 35. Is transmitted to the first rotor 33 of the first motor generator 18. The power of the engine 12 transmitted to the input shaft 27 is also transmitted to the ring gear 23 (output shaft 49) via the planetary carrier 24 and the pinion gear 25.

  On the other hand, outer teeth 23b are integrally formed on the outer surface of the ring gear 23 in which inner teeth 23a meshing with the pinion gear 25 are formed on the inner periphery, and the second pinion gear 43 meshing with the outer teeth 23b is formed by the second motor. The rotating shaft 42 of the second rotor 41 of the generator 19 is provided. The ring gear 23 is connected to the second motor generator 19 by the external teeth 23 b and the second pinion gear 43. Then, the rotation of the second rotor 41 of the second motor generator 19 is transmitted to the output shaft 49 via the rotating shaft 42, the second pinion gear 43 and the ring gear 23. Here, the second pinion gear 43 is formed to have a smaller diameter than the ring gear 23. By using such a second pinion gear 43, the rotation of the second rotor 41 is decelerated and transmitted to the ring gear 23, and the torque is increased by this deceleration. This rotation is applied to the output shaft 49, and the driving force of the engine 12 is assisted.

  As shown in FIGS. 1 and 2, the characteristic configuration of the present invention includes a plurality of first motor generators 18 and a plurality of second motor generators 19 arranged alternately in the circumferential direction inside the housing 20. By the way. In this embodiment, a pair of both the first motor generator 18 and the second motor generator 19 are provided, and the pair of first motor generator 18 and the pair of second motor generators 19 are the engine 12 and the power split mechanism 21. The case where it is provided between is shown. However, in FIG. 3, one first motor generator 18 and one second motor generator 19 are drawn for convenience.

  2 and 3 show a case where the first motor generator 18 and the second motor generator 19 are alternately provided in the circumferential direction around the input shaft 27 that transmits the power of the engine 12 to the power split mechanism 21. As shown in FIG. 1, the first motor generator 18 and the second motor generator 19 located at the inner bottom portion of the housing 20 are provided so as to be immersed in the oil surface of the lubricating oil 51 stored in the housing 20. . In the drawing, the first motor generator 18 and the second motor generator 19 are provided adjacent to each other in the horizontal direction so as to scoop up the lubricating oil.

  In this embodiment, since a pair of the first motor generator 18 and the second motor generator 19 are provided, as shown in FIG. In this case, the pair of first motor generators 18 and the pair of second motor generators 19 are arranged at diagonal positions of the virtual rectangle A on the vertical plane with the bottom sides horizontal. In FIG. 1, a virtual square A made up of a square is shown, so that the first motor generator 18 and the second motor generator 19 are alternately provided approximately every 90 degrees in the circumferential direction around the input shaft 27. A case is shown in which the first motor generator 18 and the second motor generator 19 located at the inner bottom portion are provided in parallel with each other in the horizontal direction inside the housing 20, and thereby provided so as to be immersed in the oil surface of the lubricating oil. .

  As shown in FIGS. 2 and 3, the first motor generator 18 and the second motor generator 19 are both connected to a high voltage battery 62 via an inverter 61. The inverter 61 is a device that controls the current while converting the high voltage direct current of the high voltage battery 62 and the alternating current of the first motor generator 18 and the second motor generator 19.

  Next, the operation of the thus configured hybrid vehicle drive device will be described in accordance with the traveling state of the hybrid vehicle.

  In a region where the rotation of the drive wheels 13 is low speed and high load and the engine efficiency is low, such as when starting and running at a low speed, the operation of the engine 12 is stopped and power is supplied from the high voltage battery 62 to the second motor generator 19. Supplied. The second rotor 41 of the second motor generator 19 rotates, and the rotation of the second rotor 41 is transmitted to the output shaft 49 via the rotating shaft 42, the second pinion gear 43 and the ring gear 23. The rotation of the output shaft 49 is transmitted to the drive wheel 13 through the propeller shaft 15 and the like. Thus, the drive wheels 13 are driven only by the power of the second motor generator 19. At this time, in the first motor generator 18, the first rotor 33 is idled. FIG. 4A shows the relationship among the rotational speeds of the first motor generator 18, the engine 12, and the second motor generator 19 at this time.

  Further, in such a region where the engine efficiency is low, even if the engine 12 is operated, the rotational speed of the engine can be kept low by rotating the second rotor 41 of the second motor generator 19. FIG. 4B shows the relationship among the rotational speeds of the first motor generator 18, engine 12, and second motor generator 19 at this time.

  On the other hand, during normal travel, the engine 12 is operated, and the power is split into two paths by the power split mechanism 21 and then transmitted to the drive wheels 13. One path is a path for transmitting the power input to the input shaft 27 to the pinion gear 25 and the ring gear 23. The power divided in this path is directly transmitted to the output shaft 49.

  The other path is a path for generating power by driving the generator. Specifically, this is a path for transmitting the power input to the input shaft 27 to the first rotor 33 of the first motor generator 18 via the pinion gear 25, the sun gear 22, the auxiliary gear 26 and the first pinion gear 35. With this power transmission, the first motor generator 18 rotates the first rotor 33 to generate power. The generated electric power is supplied to the second motor generator 19, and the second motor generator 19 is used as an auxiliary power source for the engine 12.

  That is, the second rotor 41 of the second motor generator 19 rotates, and the rotation of the second rotor 41 is transmitted to the output shaft 49 via the rotation shaft 42, the second pinion gear 43 and the ring gear 23. Then, the drive wheels 13 are driven by the power transmitted through both paths and finally output from the output shaft 49. FIG. 4C shows the relationship among the rotational speeds of the first motor generator 18, the engine 12, and the second motor generator 19 at this time.

  In particular, when the load is high, such as in an uphill state, electric power is supplied from the high voltage battery 62 to the second motor generator 19 in addition to the above-described normal traveling. For this reason, the auxiliary power by the second motor generator 19 is further increased. FIG. 4D shows the relationship among the rotational speeds of the first motor generator 18, the engine 12, and the second motor generator 19 when the auxiliary power by the second motor generator 19 is increased as described above.

  As shown in FIG. 3, when the power split mechanism 21 is constituted by a planetary gear mechanism, the relationship among the rotational speeds of the first motor generator 18, the engine 12, and the second motor generator 19 is shown in FIG. As shown, there is a collinear relationship that always forms a straight line, and either one of the first motor generator 18 and the second motor generator 19 may stop while the vehicle is traveling. Will never stop.

  In such a hybrid vehicle drive device 14, lubrication is also performed from the viewpoint of preventing wear of the planetary gear mechanism constituting the power split mechanism 3, and lubricating oil for the lubrication is contained in the housing 20. Stored. As shown in FIG. 1, the amount of the lubricating oil 51 is provided at least on the respective rotation shafts 34 and 42 of the first motor generator 18 and the second motor generator 19 provided horizontally on the inner bottom portion of the housing 20. The first and second pinion gears 35 and 43 are stored so as to contact each other. FIG. 1 shows a state in which the ring gear 23 is stored to such an extent that it contacts.

  In the present invention, the first motor generator 18 and the second motor generator 19 positioned at the inner bottom portion of the housing 20 are provided adjacent to each other in the horizontal direction so as to be immersed in the oil surface of the lubricating oil. When the generator 18 and the second motor generator 19 are driven, the first and second pinion gears 35 and 43 provided on the rotary shafts 34 and 42 rotate to scrape the lubricating oil 51 stored in the housing 20. Will be raised. As shown in FIG. 1, when the ring gear 23 is in contact with the lubricating oil 51, the rotating ring gear 23 also scoops up the lubricating oil. Then, the scraped lubricating oil 51 lubricates the power split mechanism 21 accommodated in the housing 20. Therefore, in the present invention, the power split mechanism 21 existing inside the housing 20 without using an oil pump. Can be lubricated.

  Here, in this drive device 14, the power split mechanism 21 is composed of a planetary gear mechanism. In this planetary gear mechanism, the rotational speeds of the first motor generator 18, the engine 12, and the second motor generator 19 are respectively As shown in FIG. 4, the relationship is a collinear diagram that is a straight line. From this, while the vehicle is running, either one of the first motor generator 18 and the second motor generator 19 may stop, but neither of them stops. Then, in the present invention, the first motor generator 18 and the second motor generator 19 in the inner bottom portion of the housing 20 are provided adjacent to each other in the horizontal direction so as to be immersed in the oil surface of the lubricating oil. Therefore, the lubricating oil 51 is always scraped up inside the housing 20, and the power split mechanism 21 existing inside the housing 20 is always lubricated by the scraped lubricating oil 51. be able to. As a result, the conventionally required oil pump for lubrication is no longer necessary, and the unit size is increased due to housing the pump and the unit price is increased due to the use of the oil pump. It can be avoided.

  Further, when a pair of the first motor generator 18 and the second motor generator 19 is provided, as shown in FIGS. 1 and 2, the diagonal of the virtual rectangle A in the vertical plane with the bottom side horizontal in the housing 20 is provided. By disposing the pair of first motor generators 18 and the pair of second motor generators 19 at positions, it is possible to prevent a useless space from being generated inside the housing 20 and to further effectively use the space.

  In the embodiment described above, the first motor generator 18 and the second motor generator 19 have been described using an AC synchronous motor as functioning as an electric motor or a generator, but the first motor generator 18 and the second motor generator 18 The motor generator 19 is not limited to an AC synchronous motor, and a VR type (variable reluctance type) synchronous motor, a vernier motor, a DC motor, an induction motor, a super electric motor, a step motor, or the like can be used.

DESCRIPTION OF SYMBOLS 11 Hybrid vehicle 12 Engine 13 Drive wheel 14 Drive apparatus 18 1st motor generator 19 2nd motor generator 20 Housing 21 Power split mechanism 51 Lubricating oil A Virtual square

Claims (2)

A first motor generator (18) that functions as an electric motor or a generator; a power split mechanism (21) that splits the power generated by the engine (12) into the first motor generator (18) and the drive wheels (13); A second motor generator (19) for generating power for driving the drive wheels (13), the first motor generator (18), the power split mechanism (21), and the second motor generator (19) A lubricating structure for a hybrid vehicle drive device comprising a housing (20) for storing and storing lubricating oil (51),
A plurality of the first motor generator (18) and the second motor generator (19) are provided, and are alternately arranged in the circumferential direction inside the housing (20).
The first motor generator (18) and the second motor generator (19) located at the inner bottom of the housing (20) are immersed in the oil level of the lubricating oil (51) stored in the housing (20). A lubrication structure for a drive device for a hybrid vehicle, which is provided in   A pair of a first motor generator (18) and a second motor generator (19) are provided, and a pair of the first motor generator (18) and a pair of the second motor generator (19) are at the bottom in the housing (20). The lubricating structure for a hybrid vehicle drive device according to claim 1, wherein the lubricating structure is disposed at a diagonal position of a virtual square (A) in a vertical plane with the horizontal plane.

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