JP5200747B2 - Lubricating oil supply device for rotating electrical machines - Google Patents

Description

  The present invention relates to a lubricating oil supply device for a rotating electrical machine, and in particular, has a stator fixed to a case and a rotor connected to an outer periphery of a rotating electrical machine shaft rotatably supported by the case, and the rotor is a stator. The present invention relates to a lubricating oil supply device for a rotating electrical machine that supplies lubricating oil to a rotating electrical machine that is disposed radially inward.

  In an apparatus including a rotating electrical machine having a stator and a rotor, an axial supply passage provided in an axial direction on a rotating shaft of the rotor, and a radial supply passage that communicates the axial supply passage and the rotating electrical machine in a radial direction. A technique for cooling lubricating oil in a rotating electric machine is known.

  For example, Patent Document 1 discloses a vehicle that supplies lubricating oil to a rotor and a stator by centrifugal force through an oil circulation hole (axial supply passage) provided in a motor shaft and a discharge hole (radial supply passage). A wheel drive device for a vehicle is disclosed. In the vehicle wheel drive device of Patent Document 1, the lubricating oil flows from the gear storage chamber on one side of the oil circulation hole in the axial direction.

JP 2006-248417 A

  When the lubricating oil is supplied from one axial side of the axial supply passage, the axial supply passage is located at the upstream side (the one side) in the axial flow direction that is the lubricating oil flow direction of the axial supply passage. Lubricating oil preferentially flows through the radial supply passage that communicates with the rotating electrical machine. For example, when a plurality of radial supply passages are arranged along the axial direction, a large amount of lubricating oil flows out from the radial supply passage located on the upstream side in the axial flow direction. For this reason, the amount of lubricating oil reaching the radial supply passage located downstream in the axial flow direction is reduced. As a result, the amount of lubricating oil supplied to the rotating electrical machine via the radial supply passage at the upstream position in the axial direction and the lubrication supplied to the rotating electrical machine via the radial supply passage at the downstream position. There is a possibility that it becomes difficult to cool the rotating electrical machine evenly because the supply amount of oil becomes unbalanced.

  When lubricating oil is supplied from one axial side of the axial supply passage, the supply amount of the lubricating oil supplied to the rotating electrical machine via the radial supply passage can be prevented from being unbalanced in the axial direction. Is desired.

  An object of the present invention is to have a stator fixed to a case and a rotor connected to an outer peripheral portion of a rotating electrical machine shaft that is rotatably supported by the case, and the rotor is disposed radially inward of the stator. In a lubricating oil supply device for a rotating electrical machine that supplies lubricating oil to a rotating electrical machine, an axial supply path that is a lubricating oil supply path formed in an axial direction radially inward of the rotating electrical machine shaft, and an axial supply path When the lubricating oil is supplied to the axial supply passage from one side in the axial direction, the radial supply passage is provided. It is providing the lubricating oil supply apparatus of a rotary electric machine which can suppress that the supply amount of the lubricating oil supplied to a rotary electric machine via an axial becomes imbalance in an axial direction.

A lubricating oil supply device for a rotating electrical machine according to the present invention includes a stator fixed to a case, and a rotor connected to an outer peripheral portion of a rotating electrical machine shaft rotatably supported by the case, wherein the rotor is the stator. A lubricating oil supply device for a rotating electrical machine that supplies lubricating oil to a rotating electrical machine that is disposed radially inward, wherein a hole is formed along the axial direction inside the rotating electrical machine shaft. A rotary electric machine axial radial communication path formed in the rotary electric machine shaft and communicating the hole and the rotary electric machine in a radial direction, and disposed in the hole, the axial supply passage for the lubricating oil in the axial direction A supply pipe in which an axial supply passage is formed, and a supply pipe radial communication path formed in the supply pipe and communicating the axial supply passage and the hole portion in a radial direction. The lubricating oil is supplied to the supply passage from one side in the axial direction. Is fed in the axial direction, said the installation range of the supply pipe radial direction communicating channel, the the installation range of the rotary electric machine shaft radial direction communicating channel is overlapped and, the flow direction of the lubricating oil in said axial supply passage The width in the direction perpendicular to the axial flow direction in the supply pipe radial communication path that connects the axial supply passage and the hole at a position upstream of the axial flow direction is downstream of the axial flow direction. It is characterized in that it is narrower than the width in the supply pipe radial direction communication path that communicates the axial direction supply path and the hole at a position on the side .

  In the lubricating oil supply device for a rotating electrical machine according to the present invention, the lower end in the vertical direction of the supply pipe radial direction communication path that communicates the axial supply path and the hole at a position upstream of the axial flow direction, Compared with the lower end in the vertical direction of the supply pipe radial communication path that communicates the axial supply path and the hole at a position downstream of the axial flow direction, the vertical position is an upper position. To do.

In the lubricating oil supply device for a rotating electrical machine according to the present invention, the number of the supply pipe radial direction communication paths is one in the axial flow direction.

  In the lubricating oil supply device for a rotating electrical machine according to the present invention, the rotating electrical machine constitutes a part of a power transmission device of a vehicle, and the case includes power between the drive source and the drive shaft of the vehicle. And a lubricating oil reservoir formed vertically below the rotating member, and the lubricating oil fed from the reservoir by rotation of the rotating member is It supplies to each part of the said power transmission device containing an axial direction supply channel | path.

A lubricating oil supply device for a rotating electrical machine according to the present invention includes a stator fixed to a case, and a rotor connected to an outer peripheral portion of a rotating electrical machine shaft rotatably supported by the case, wherein the rotor is the stator. A lubricating oil supply device for a rotating electrical machine that supplies lubricating oil to a rotating electrical machine that is disposed radially inward, wherein a hole is formed along the axial direction inside the rotating electrical machine shaft. A rotary electric machine axial radial communication path formed in the rotary electric machine shaft and communicating the hole and the rotary electric machine in a radial direction, and disposed in the hole, the axial supply passage for the lubricating oil in the axial direction A supply pipe in which an axial supply passage is formed, and a supply pipe radial communication path formed in the supply pipe and communicating the axial supply passage and the hole portion in a radial direction. The lubricating oil is supplied to the supply passage from one side in the axial direction. Is fed in the axial direction, said the installation range of the supply pipe radial direction communicating channel, the the installation range of the rotary electric machine shaft radial direction communicating channel is overlapped and, the flow direction of the lubricating oil in said axial supply passage The width in the direction perpendicular to the axial flow direction in the supply pipe radial communication path that connects the axial supply passage and the hole at a position upstream of the axial flow direction is downstream of the axial flow direction. It is narrower than the width of the supply pipe radial direction communication path that connects the axial direction supply path and the hole at the side position .

  As a result, on the upstream side in the axial flow direction, it is possible to prevent a large amount of lubricating oil from flowing out to the rotating electrical machine via the radial supply passage, and an appropriate amount to the downstream radial supply passage in the axial flow direction. It is possible to reach the lubricating oil. Therefore, the supply amount of the lubricating oil supplied to the rotating electrical machine via the radial supply passage can be prevented from being unbalanced in the axial direction.

  Hereinafter, an embodiment of a lubricating oil supply device for a rotating electrical machine according to the present invention will be described in detail with reference to the drawings.

(Embodiment)
The embodiment will be described with reference to FIGS. 1 to 4. This embodiment has a stator fixed to a case and a rotor connected to the outer peripheral portion of a rotating electrical machine shaft that is rotatably supported by the case, and the rotor is disposed radially inward of the stator. The present invention relates to a lubricating oil supply device for a rotating electrical machine that supplies lubricating oil to the rotating electrical machine.

  In the power transmission device of the present embodiment (see reference numeral 100 in FIG. 3), lubricating oil for the transaxle is supplied to the shaft center (hole, reference numeral 51 in FIG. 3) of the motor generator (see reference numeral 9 in FIG. 3). , Ensure cooling and lubrication. The boss portion (see reference numeral 54 in FIG. 3) for supplying the lubricating oil to the shaft center was cut out by casting the side wall, and a notch hole (supply pipe radial communication path, see reference numeral 57 in FIG. 3) was made. It has a structure. The supply pipe radial direction communication passage 57 gradually expands toward the downstream side in the lubricating oil flow direction (the right side in FIG. 3). For this reason, the lubricating oil flowing inside the boss portion 54 gradually overflows to the axial center portion along the supply pipe radial direction communication passage 57 when flowing to the downstream side. As a result, the lubricating oil is allowed to flow evenly to the shaft center portion, and even oil distribution to the left and right (upstream side and downstream side) inside the shaft center becomes possible.

  FIG. 1 is a skeleton diagram showing a FF (front engine front drive; engine front front wheel drive) type hybrid vehicle power transmission device 100 to which an embodiment of the present invention is applied. In FIG. 1, reference numeral 1 denotes an engine (drive source). As the engine 1, an internal combustion engine, specifically, a gasoline engine, a diesel engine, an LPG engine, a methanol engine, a hydrogen engine, or the like can be used.

  In this embodiment, the case where a gasoline engine is used as the engine 1 will be described for convenience. The engine 1 is a device that outputs power from the crankshaft 2 by combustion of fuel, and is a known device that includes an intake device, an exhaust device, a fuel injection device, an ignition device, a cooling device and the like. The crankshaft 2 is disposed horizontally in the vehicle width direction, and a flywheel 3 is formed at the rear end of the crankshaft 2.

  A hollow transaxle case (case) 4 is attached to the outer wall of the engine 1. The transaxle case 4 has an engine side housing 70, an extension housing 71, and an end cover 72. The engine-side housing 70, the extension housing 71, and the end cover 72 are formed by molding a metal material such as aluminum. Further, the engine 1 and the engine side housing 70 are fixed to each other in a state where the one opening end 73 of the engine side housing 70 and the engine 1 are in contact with each other.

  An extension housing 71 is disposed between the engine side housing 70 and the end cover 72. Further, the engine-side housing 70 and the extension housing 71 are fixed to each other in a state where the other opening end 74 of the engine-side housing 70 and one opening end 75 of the extension housing 71 are in contact with each other. Furthermore, an end cover 72 is attached so as to close the other open end 76 of the extension housing 71, and the end cover 72 and the extension housing 71 are fixed to each other.

  Inside the transaxle case 4, an input shaft (input shaft) 5, a first motor generator 6, a power combining mechanism 7, a transmission mechanism 8, and a second motor generator (rotating electric machine) 9 are provided. The input shaft 5 is disposed concentrically with the crankshaft 2. A clutch hub 10 is spline-fitted to an end of the input shaft 5 on the crankshaft 2 side.

  In the transaxle case 4, a clutch 11 that controls the power transmission state between the flywheel 3 and the input shaft 5 is provided. Further, a damper mechanism 12 that suppresses and absorbs torque fluctuation between the flywheel 3 and the input shaft 5 is provided. The first motor generator 6 is disposed outside the input shaft 5, and the second motor generator 9 is disposed at a position farther from the engine 1 than the first motor generator 6.

  That is, the first motor generator 6 is arranged between the engine 1 and the second motor generator 9. The first motor generator 6 and the second motor generator 9 have a function (power running function) as an electric motor driven by supplying electric power and a function (regenerative function) as a generator that converts mechanical energy into electric energy. Have both. As the first motor generator 6 and the second motor generator 9, for example, an AC synchronous motor generator can be used. As a power supply device that supplies power to the first motor generator 6 and the second motor generator 9, a power storage device such as a battery or a capacitor, a known fuel cell, or the like can be used.

  The arrangement position of the first motor generator 6 and the configuration of the first motor generator 6 will be specifically described. A partition wall 77 extending toward the engine 1 side and then extending toward the input shaft 5 side is formed on the inner surface of the engine side housing 70. Further, a case cover 78 is fixed to the partition wall 77. The case cover 78 has a shape that extends in a direction away from the engine 1 and then extends toward the input shaft 5 side. The first motor generator 6 is arranged in a space G <b> 2 surrounded by the partition wall 77 and the case cover 78. The first motor generator 6 has a stator 13 fixed to the transaxle case 4 side and a rotatable rotor 14. The stator 13 has an iron core 15 fixed to the partition wall 77 and a coil 16 wound around the iron core 15.

  The stator 13 and the rotor 14 are configured by laminating a plurality of electromagnetic steel sheets having a predetermined thickness in the thickness direction. The plurality of electromagnetic steel plates are stacked in the axial direction of the input shaft 5. A region between the both ends of the coil 16 of the first motor generator 6 in the axial direction of the input shaft 5 is an arrangement region L1 of the first motor generator 6 in the axial direction of the input shaft 5. On the other hand, a hollow shaft 17 is attached to the outer periphery of the input shaft 5. And the input shaft 5 and the hollow shaft 17 are comprised so that relative rotation is possible. The rotor 14 is connected to the outer peripheral side of the hollow shaft 17.

  A power combining mechanism (in other words, a power distribution mechanism) 7 is provided between the first motor generator 6 and the second motor generator 9. The power combining mechanism 7 includes a so-called single pinion type planetary gear mechanism 7A. That is, the planetary gear mechanism 7 </ b> A includes a sun gear 18, a ring gear 19 disposed concentrically with the sun gear 18, and a carrier 21 holding a pinion gear 20 that engages with the sun gear 18 and the ring gear 19. The sun gear 18 and the hollow shaft 17 are connected, and the carrier 21 and the input shaft 5 are connected. The ring gear 19 is formed on the inner peripheral side of an annular member (in other words, a cylindrical member) 22 arranged concentrically with the input shaft 5, and the counter drive gear 23 is formed on the outer peripheral side of the annular member 22. Has been.

  The second motor generator 9 is provided at a position farther from the engine 1 than the counter drive gear 23. The rotor 26 of the second motor generator 9 is connected to the outer periphery of an MG shaft (rotating electric machine shaft) 45, and the MG shaft 45 is disposed substantially horizontally in the vehicle width direction. The MG shaft 45, the input shaft 5 and the hollow shaft 17 are arranged non-concentrically.

  That is, the input shaft 5 is arranged in parallel with the MG shaft 45. A part of the axial direction 5t including the end of one side (end cover 72 side) of the input shaft 5 in the axial direction, and a shaft including the end of the other side (engine 1 side) of the MG shaft 45 in the axial direction. The partial regions 45t in the direction face each other in the radial direction.

  The arrangement position of the second motor generator 9 and the configuration of the second motor generator 9 will be specifically described. A partition wall 79 extending toward the MG shaft 45 side is formed on the inner surface of the extension housing 71. The second motor generator 9 is disposed in a space G3 surrounded by the extension housing 71, the partition wall 79, and the end cover 72.

  The second motor generator 9 has a stator 25 fixed to the transaxle case 4 and a rotatable rotor 26. The stator 25 has an iron core 27 and a coil 28 wound around the iron core 27. The stator 25 and the rotor 26 are configured by laminating a plurality of electromagnetic steel plates having a predetermined thickness in the thickness direction. The plurality of electromagnetic steel sheets are stacked in the axial direction of the MG shaft 45. A distance between both ends of the coil 28 of the second motor generator 9 in the axial direction of the MG shaft 45 corresponds to an arrangement region L2 of the second motor generator 9 in the axial direction of the MG shaft 45.

  As described above, the first motor generator 6 and the second motor generator 9 are arranged at different positions in the axial direction of the MG shaft 45, the input shaft 5, and the hollow shaft 17. More specifically, the arrangement positions of the motor generators are set so that the arrangement area L1 of the first motor generator 6 and the arrangement area L2 of the second motor generator 9 do not overlap in the axial direction. Yes. Further, the rotation center (center axis) of the first motor generator 6 and the rotation center (center axis) of the second motor generator 9 are displaced in the radial direction of each shaft.

  A gear 46 is formed (connected) at the end of the MG shaft 45 on the power combining mechanism 7 side. The gear 46 is a helical gear and is engaged with (engaged with) the counter drive gear 23. The counter drive gear 23 and the gear 46 are configured such that the gear ratio when power is transmitted from the gear 46 to the counter drive gear 23 is greater than “1”. The gear 46 and the counter drive gear 23 constitute the speed change mechanism 8. When the power of the second motor generator 9 is transmitted to the gear 46 via the MG shaft 45, the rotational speed of the gear 46 is reduced and transmitted to the annular member 22. That is, the torque of the second motor generator 9 is amplified and transmitted to the power combining mechanism 7.

  On the other hand, a countershaft 34 parallel to the input shaft 5 is provided inside the transaxle case 4. A counter driven gear 35 and a final drive pinion gear 36 are formed on the counter shaft 34. The counter drive gear 23 and the counter driven gear 35 are engaged. Further, a differential 37 is provided inside the transaxle case 4, and the differential 37 is connected to a final ring gear (rotating member) 39 formed on the outer peripheral side of the differential case 38 and a pinion shaft 40 with respect to the differential case 38. A plurality of connected pinion gears 41, a side gear 42 engaged with the plurality of pinion gears 41, and two front drive shafts (drive shafts) 43 connected to the side gears 42. A front wheel 44 is connected to each front drive shaft 43. In this way, a so-called transaxle is formed in which the transmission mechanism 8 and the differential 37 are collectively incorporated in the transaxle case 4.

  Here, with reference to FIG. 2, the arrangement | positioning of each axis | shaft in the transaxle case 4 is demonstrated. FIG. 2 is a diagram showing a shaft arrangement of the power transmission device 100.

  The arrangement of the axes 5, 34, 43, 45 is as follows. With the input shaft 5 as a reference, the MG shaft 45 is disposed obliquely above and the counter shaft 34 is disposed obliquely below. Compared with the central axis C5 of the front drive shaft 43, the central axis C6 of the counter shaft 34 is located slightly below. A central axis C6 of the countershaft 34 is located below an imaginary line L4 connecting the central axis C3 of the input shaft 5 and the central axis C5 of the front drive shaft 43. The MG shaft 45 is disposed in the upper part of the transaxle case 4 and the counter shaft 34 is disposed in the lower part. Further, the counter drive gear 23 also serves as a driven gear driven by the gear 46. 45 can be arranged in a compact manner. Thereby, the big merit, such as the cost reduction which is a big subject of HV, the improvement of vehicle mounting property, and the fuel consumption improvement by mass reduction, is acquired.

  The rotation directions of the axes 5, 45, 43, and 34 are directions indicated by arrows A3 to A6 in FIG. That is, the front drive shaft 43 rotates in the left direction in FIG. 2 below the central axis C5, and the counter shaft 34 rotates in the right direction in FIG. 2 below the central axis C6. In other words, the rotation direction of the front drive shaft 43 and the rotation direction of the counter shaft 34 are directions away from each other in a region below the respective central axis. In addition, the rotation direction of illustration is a thing at the time of advance of a vehicle. Further, the vertical direction in the description of the present embodiment means the vertical direction (vertical direction) when mounted on a vehicle unless otherwise specified.

  In the power transmission device 100 according to the present embodiment, the lubricating oil collected in the lower part in the transaxle case 4 is lifted up by the final ring gear 39 (see arrow Y1), and the oil catch provided in the upper part in the transaxle case 4 It is sent to the tank 32. In the transaxle case 4, a storage portion 30 for storing lubricating oil is formed below the final ring gear 39 in the vertical direction. The reservoir 30 is formed by the inner wall (side wall and bottom) of the transaxle case 4. The oil catch tank 32 is provided above the final ring gear 39. The lubricating oil accumulated in the reservoir 30 is sent out by the rotation of the final ring gear 39, and a part thereof flows into the oil catch tank 32 as indicated by an arrow Y1. Lubricating oil is dripped from the oil catch tank 32 at an appropriate flow rate toward a lubrication point (lubricated part) or a cooling point in the transaxle case 4.

  In the hybrid vehicle configured as described above, the required torque to be transmitted to the front wheels 44 is calculated based on conditions such as the vehicle speed and the accelerator opening, and the engine 1, the clutch 11, the first torque is calculated based on the calculation result. The first motor generator 6 and the second motor generator 9 are controlled. When the torque output from the engine 1 is transmitted to the front wheels, the clutch 11 is engaged. Then, the power (in other words, torque) of the crankshaft 2 is transmitted to the carrier 21 via the input shaft 5.

  The torque transmitted to the carrier 21 is transmitted to the front wheels 44 via the ring gear 19, the annular member 22, the counter drive gear 23, the counter driven gear 35, the counter shaft 34, the final drive pinion gear 36, and the differential 37, and a driving force is generated. . Further, when the torque of the engine 1 is transmitted to the carrier 21, the first motor generator 6 can function as a generator, and the generated electric power can be charged in a power storage device (not shown).

  Further, the second motor generator 9 can be driven as an electric motor, and the power can be transmitted to the power combining mechanism 7. When the power of the second motor generator 9 is transmitted to the gear 46 via the MG shaft 45, the rotational speed of the gear 46 is reduced and transmitted to the annular member 22. That is, the torque of the second motor generator 9 is amplified and transmitted to the power combining mechanism 7. In this way, the power of the engine 1 and the power of the second motor generator 9 are input to the power combining mechanism 7 and combined, and the combined power is transmitted to the front wheels 44. That is, the power combining mechanism 7 transmits at least one of the power of the engine 1 or the power of the second motor generator 9 to the front wheels 44.

  In the power transmission device 100 of the present embodiment, the lubricating oil sent out by the final ring gear 39 and accumulated in the oil catch tank 32 is sent to the second motor generator 9 to lubricate and cool the second motor generator 9. The lubricating oil stored in the oil catch tank 32 is supplied from the oil catch tank 32 through the end cover 72 to the shaft center of the second motor generator 9 as indicated by an arrow Y2 in FIG.

  FIG. 3 is a cross-sectional view showing the vicinity of the second motor generator 9.

  The MG shaft 45 is divided into a first MG shaft 45a and a second MG shaft 45b. The first MG shaft 45a is disposed on the end cover 72 side (the side farther from the engine 1) than the second MG shaft 45b in the axial direction. The first MG shaft 45a and the second MG shaft 45b are spline-fitted and rotate together. The rotor 26 of the second motor generator 9 is connected to the outer periphery of the first MG shaft 45a. A gear 46 is formed on the outer periphery of the second MG shaft 45b.

  The first MG shaft 45a is rotatably supported by two bearings 61 and 62. The bearings 61 and 62 are disposed on one side and the other side of the rotor 26 in the axial direction, respectively. One end of the first MG shaft 45 a in the axial direction is supported by the end cover 72 via the bearing 61. The other end of the first MG shaft 45 a in the axial direction is supported by a partition wall 79 via a bearing 62.

  A hole 51 is formed along the axial direction inside the first MG shaft 45a in the radial direction. The hole 51 penetrates the first MG shaft 45a in the axial direction. In other words, the first MG shaft 45a is formed in a hollow cylindrical shape. The first MG shaft 45a is provided with two rotary electric machine axial radial communication passages 52 and 53 that communicate the hole 51 and the second motor generator 9 in the radial direction. The rotating electrical machine axial radial communication path 52 is disposed at one end of the rotor 26 in the axial direction, and the rotating electrical machine axial radial communication path 53 is disposed at the other axial end of the rotor 26. The rotating electrical machine axial radial communication paths 52 and 53 function as radial supply paths that are radial supply paths for supplying lubricating oil to the rotor 26 and the stator 25.

  A boss portion (supply pipe) 54 is disposed inwardly in the radial direction of the hole portion 51. The boss portion 54 has a hollow cylindrical shape, and is formed integrally with the end cover 72 on an inner wall surface (surface on the engine 1 side) 72 a of the end cover 72. In other words, the boss portion 54 protrudes from the inner wall surface 72a of the end cover 72 toward the engine 1 and is hollow in the radial direction. A tip end portion (end portion on the engine 1 side) 54 a of the boss portion 54 is at the same position as the rotating electrical machine axial radial direction communication path 53 in the axial direction. An axial supply passage 55 that is a hollow portion of the boss portion 54 penetrates the boss portion 54 in the axial direction.

  Lubricating oil is supplied to the axial supply passage 55 via the end cover 72. Lubricating oil is sent to the upper part of the end cover 72 from an oil catch tank 32 (see FIG. 2) via an oil passage (not shown) (see arrow Y3 in FIG. 3). In the end cover 72, an in-cover passage 56 for supplying the lubricating oil sent from the oil catch tank 32 to the axial supply passage 55 is formed. The lubricating oil sent from the oil catch tank 32 flows through the in-cover passage 56 into the axial supply passage 55 by free fall. The in-cover passage 56 is connected to an axial end portion (an end portion far from the engine 1) 55a of the axial supply passage 55. That is, the lubricating oil is supplied to the axial supply passage 55 from one side in the axial direction.

  The boss portion 54 is provided with a supply pipe radial communication passage 57 that communicates the axial supply passage 55 and the hole portion 51 in the radial direction. In other words, the supply pipe radial communication path 57 communicates the inner side and the outer side of the boss portion 54 in the radial direction. FIG. 4 is a plan view of the power transmission device 100 as viewed from the end cover 72 side. As shown in FIGS. 3 and 4, the supply pipe radial direction communication passage 57 is formed on the side surface of the boss portion 54. As shown in FIG. 3, the supply pipe radial communication path 57 is provided at a position between the two rotary electric machine axial radial communication paths 52 and 53. In other words, in the axial direction, the installation range of the supply pipe radial direction communication passage 57 and the installation range of the rotating electrical machine radial direction communication passages 52 and 53 overlap. The supply pipe radial communication path 57 functions as a radial supply path that is a radial supply path for supplying lubricating oil to the rotor 26 and the stator 25.

  In FIG. 3, a symbol L indicates a width (hereinafter, referred to as “opening width”) of the supply pipe radial direction communication passage 57 in a direction orthogonal to the lubricating oil flow direction (axial flow direction) of the axial supply passage 55. . In the present embodiment, the opening width L of the supply pipe radial direction communication passage 57 indicates the opening width in the circumferential direction. The opening width L of the supply pipe radial direction communication passage 57 is narrow on the side close to the end cover 72 and wide on the side far from the end cover 72. In other words, the opening width L in the supply pipe radial communication path 57 that communicates the axial supply path 55 and the second motor generator 9 at the upstream position in the axial flow direction is the downstream position in the axial flow direction. It is narrower than the opening width L in the supply pipe radial communication path 57 that communicates the axial supply path 55 and the second motor generator 9. The supply pipe radial direction communication passage 57 is formed in a tapered shape in which the opening width L increases toward the downstream side in the axial flow direction. Since the opening width L of the supply pipe radial direction communication passage 57 is set in this way, the supply amount of the lubricating oil supplied to the second motor generator 9 is unbalanced in the axial direction as will be described below. Is suppressed.

  When the lubricating oil flowing into the axial supply passage 55 from the in-cover passage 56 reaches the supply pipe radial communication path 57, the lubricating oil enters the hole 51 from the axial supply passage 55 via the supply pipe radial communication path 57. Flows out (arrow Y4). The lubricating oil that has flowed into the hole 51 is supplied to the rotor 26 and the stator 25 through the rotating electrical machine axial direction communication passages 52 and 53 by centrifugal force (see arrows Y5 and Y6). As the lubricating oil flows out through the supply pipe radial direction communication passage 57, the amount of the lubricating oil in the axial supply passage 55 decreases. For this reason, the oil level of the lubricating oil in the axial supply passage 55 decreases toward the engine 1 side (the right side in FIG. 3), which is the downstream side in the axial flow direction. In the conventional lubricating oil supply device, a large amount of lubricating oil is supplied to the upstream side in the axial direction of the second motor generator 9 (the side close to the in-cover passage 56) in the axial direction of the second motor generator 9 due to such a change in the oil level. As a result, the amount of lubricating oil supplied to the downstream side in the axial flow direction (the side far from the in-cover passage 56) is relatively small. As a result, the second motor generator 9 may not be cooled uniformly.

  In this embodiment, since the opening width L of the supply pipe radial direction communication passage 57 is increased toward the downstream side in the axial flow direction, the above problem can be suppressed. The lower end 57a of the supply pipe radial direction communication passage 57 has an inclination that goes downward in the vertical direction toward the downstream side in the axial flow direction. In other words, the lower end 57a in the vertical direction of the supply pipe radial communication passage 57 that communicates the axial supply passage 55 and the hole 51 at the upstream position in the axial flow direction is the shaft at the downstream position in the axial flow direction. Compared with the lower end 57a in the vertical direction of the supply pipe radial direction communication passage 57 that communicates the direction supply passage 55 and the hole 51, it is at a position above the vertical direction.

  Therefore, even if the lubricating oil flows out of the axial supply passage 55 and the oil level on the downstream side in the axial flow direction in the axial supply passage 55 decreases, the supply pipe radial communication passage 57 on the downstream side in the axial flow direction. It can suppress that the flow volume of the lubricating oil which flows out out via this decreases. That is, the flow rate of the lubricating oil flowing out through the supply pipe radial direction communication passage 57 is suppressed from being unbalanced in the axial direction. Therefore, the amount of lubricating oil (see arrow Y5) supplied to the second motor generator 9 through the rotary electric machine axial radial communication path 52 and the second motor generator through the rotary electric machine axial radial communication path 53. 9 can be prevented from being different from the amount of the lubricating oil (see arrow Y6) supplied to 9. As a result, the second motor generator 9 can be evenly cooled.

  In the present embodiment, the supply pipe radial communication path 57 is provided on the side surface of the boss portion 54. For this reason, even when the amount of lubricating oil supplied to the axial supply passage 55 is small, such as when lubricating oil is supplied to the axial supply passage 55 by free fall, the rotary electric machine axial radial communication passage 53 Lubricating oil can be reached. For example, when the supply pipe radial direction communication passage 57 is formed on the lower surface of the boss portion 54, the lubricating oil falls into the hole portion 51 before reaching the tip end portion 54 a of the boss portion 54. In this case, there is a possibility that an appropriate amount of lubricating oil cannot reach the rotary electric machine radial direction communication path 53. In order to deliver the lubricating oil to the tip end portion 54 a of the boss portion 54, it is necessary to supply a large amount of lubricating oil to the axial supply passage 55 by pumping with an oil pump or the like.

  On the other hand, the supply pipe radial direction communication passage 57 of the present embodiment is provided on the side surface of the boss portion 54. Since only the lubricating oil that overflows from the lower end 57 a of the supply pipe radial communication path 57 flows out into the hole 51, the supply method that does not pump the lubricating oil, in other words, the amount of lubricating oil supplied to the axial supply path 55 is reduced. Even with a relatively small supply method, the lubricating oil can reach the tip 54a of the boss 54.

  The supply pipe radial direction communication passage 57 is formed by casting, for example. When the supply pipe radial direction communication passage 57 is formed by casting, there is no increase in the number of parts or an increase in the machining site. For this reason, it is possible to minimize the cost increase. In addition, since it is not necessary to process the MG shaft 45 into a complicated shape, a change in shaft balance due to the processing can be eliminated, and processing costs can be reduced.

(First Modification of Embodiment)
A first modification of the embodiment will be described.

  In the above-described embodiment, the number of the supply pipe radial direction communication paths 57 is one in the axial flow direction, and the supply pipe radial direction communication paths 57 are tapered such that the opening width L increases toward the downstream side in the axial flow direction. Although formed in a shape, the number or shape of the supply pipe radial direction communication passages 57 is not limited to this. In this modification, a plurality of supply pipe radial communication paths 57 are arranged at different positions in the axial direction, and the cross-sectional area (opening width) of the supply pipe radial communication paths 57 on the downstream side in the axial flow direction is It is set larger than the cross-sectional area of the supply pipe radial direction communication passage 57 on the upstream side in the axial flow direction.

  FIG. 5 is a cross-sectional view of the power transmission device 100 according to this modification.

  The boss portion 54 of the present modification is provided with supply pipe radial direction communication passages 58 and 59. The supply pipe radial direction communication passages 58 and 59 are formed on the side surface of the boss portion 54. The upstream supply pipe radial communication path 58 is formed upstream of the downstream supply pipe radial communication path 59 in the axial flow direction. The upstream supply pipe radial communication path 58 has a smaller cross-sectional area than the downstream supply pipe radial communication path 59. In other words, the width in the direction perpendicular to the axial flow direction in the upstream supply pipe radial communication path 58 that communicates the axial supply path 55 and the second motor generator 9 at the upstream position in the axial flow direction is It is narrower than the width in the downstream supply pipe radial communication path 59 that communicates the axial supply path 55 and the second motor generator 9 at a downstream position in the flow direction.

  Thereby, it is possible to suppress the flow rate of the lubricating oil flowing out from the upstream supply pipe radial direction communication passage 58 from becoming excessively large compared to the flow rate of the lubricating oil flowing out from the downstream supply pipe radial direction communication passage 59. Further, the lower end of the upstream supply pipe radial communication path 58 is positioned above the lower end of the downstream supply pipe radial communication path 59 in the vertical direction. Thereby, in the axial direction supply passage 55, even if the oil level of the lubricating oil in the downstream supply pipe radial direction communication path 59 is lower than the oil level of the lubricating oil in the upstream supply pipe radial direction communication path 58, An appropriate amount of lubricating oil can be discharged from the downstream supply pipe radial communication path 59.

(Second Modification of Embodiment)
A second modification of the embodiment will be described.

  Instead of the supply pipe radial direction communication path 57 or in addition to the supply pipe radial direction communication path 57, the axial flow direction between the upstream side and the downstream side in the axial flow direction of the rotary electric machine axial direction communication paths 52 and 53. You may make it vary the width | variety of the direction orthogonal to. The width in the direction orthogonal to the axial flow direction of the rotating electrical machine axial radial communication passage 52 positioned on the upstream side in the axial flow direction is narrower than the width of the rotating electrical machine axial radial communication passage 53 positioned on the downstream side. Can be set. Even in this case, it is possible to suppress the supply amount of the lubricating oil supplied to the second motor generator 9 from being unbalanced in the axial direction.

It is a skeleton figure which shows the power transmission device with which embodiment of the lubricating oil supply apparatus of the rotary electric machine of this invention was applied. It is a figure which shows the axial arrangement | positioning of the power transmission device with which embodiment of the lubricating oil supply apparatus of the rotary electric machine of this invention was applied. It is sectional drawing which shows the 2nd motor generator vicinity in the power transmission device with which embodiment of the lubricating oil supply apparatus of the rotary electric machine of this invention was applied. It is the top view which looked at the power transmission device with which embodiment of the lubricating oil supply apparatus of the rotary electric machine of this invention was applied from the end cover side. It is sectional drawing of the power transmission device which concerns on the 1st modification of embodiment of the lubricating oil supply apparatus of the rotary electric machine of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 Crankshaft 3 Flywheel 4 Transaxle case 5 Input shaft 6 1st motor generator 7 Power synthetic | combination mechanism 7A Planetary gear mechanism 8 Transmission mechanism 9 2nd motor generator 13 Stator 14 Rotor 15 Iron core 16 Coil 18 Sun gear 19 Ring gear 20 pinion gear 21 carrier 22 annular member 23 counter drive gear 25 stator 26 rotor 27 iron core 28 coil 32 oil catch tank 34 counter shaft 35 counter driven gear 39 final ring gear 43 front drive shaft 44 front wheel 45 MG shaft 45a first MG shaft 45b second MG Shaft 46 Gear 51 Hole 52, 53 Rotary electric machine axial radial communication passage 54 Boss portion 55 Axial supply passage 5 6 Inner cover passage 57 Supply pipe radial communication path 58 Upstream supply pipe radial communication path 59 Downstream supply pipe radial communication path 70 Engine side housing 71 Extension housing 72 End cover 79 Bulkhead 100 Power transmission device L Opening width

Claims (4)

A rotating electrical machine having a stator fixed to a case and a rotor connected to an outer peripheral portion of a rotating electrical machine shaft rotatably supported by the case, wherein the rotor is disposed radially inward of the stator A lubricating oil supply device for a rotating electrical machine that supplies lubricating oil to
Inside the rotating electrical machine shaft, a hole is formed along the axial direction,
A rotating electrical machine axial radial communication path formed in the rotating electrical machine shaft and communicating the hole and the rotating electrical machine in a radial direction;
A supply pipe which is disposed in the hole portion and in which an axial supply passage which is an axial supply passage for the lubricating oil is formed;
A supply pipe radial communication path formed in the supply pipe and communicating the axial supply path and the hole in the radial direction;
The lubricating oil is supplied to the axial supply passage from one side in the axial direction,
In the axial direction, the installation range of the supply pipe radial communication path and the installation range of the rotating electrical machine axial radial communication path overlap,
The axial supply passage is orthogonal to the axial flow direction in the supply pipe radial communication passage that connects the axial supply passage and the hole at a position upstream of the axial flow direction that is the flow direction of the lubricating oil. Rotation characterized in that the width in the direction of the rotation is narrower than the width in the supply pipe radial direction communication path communicating the axial supply path and the hole at a position downstream of the axial flow direction Electric lubricant supply device. The lubricating oil supply device for a rotating electrical machine according to claim 1 ,
The lower end in the vertical direction of the supply pipe radial communication path that communicates the axial supply path with the hole at a position upstream of the axial flow direction is the axial direction at a position downstream of the axial flow direction. A lubricating oil supply device for a rotating electrical machine, wherein the lubricating oil supply device is in a position vertically above a lower end in a vertical direction of the supply pipe radial communication path communicating with a supply passage and the hole. The lubricating oil supply device for a rotating electrical machine according to claim 1 or 2 ,
In the axial flow direction, the number of the supply pipe radial direction communication paths is one. In the lubricating oil supply apparatus of the rotary electric machine of any one of Claim 1 to 3 ,
The rotating electrical machine constitutes a part of a vehicle power transmission device,
In the case, there are provided a rotating member that transmits power between the drive source and the drive shaft of the vehicle, and a lubricating oil reservoir formed vertically below the rotating member,
The lubricating oil supply device for a rotating electrical machine, wherein the lubricating oil sent out from the reservoir by rotation of the rotating member is supplied to each part of the power transmission device including the axial supply passage.

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