JP2011122711A - Lubricating device for vehicular power transmission mechanism - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve fuel consumption or the like by miniaturizing an oil pump without impairing lubricating performance during low speed running, when carrying out lubrication by using a mechanical type oil pump and supplying lubricant. <P>SOLUTION: An oil passage 44 for cooling is provided, splashing the lubricant on a stator coil 58, and the lubricant splashed on the stator coil 58 and flowing down is received and stored by a catch tank 70. Since the catch tank 70 and a shaft oil passage 60 of an output shaft 14 are constantly communicated via a communication hole 76 or the like so as to allow circulation in both directions, the lubricant flows out from the shaft oil passage 60 and stored in the catch tank 70 during high speed running, and the lubricant in the catch tank 70 flows into the shaft oil passage 60 and used in lubrication during low speed running. Thereby, a small, lightweight and inexpensive oil pump 50 can be adopted, and efficiency of fuel consumption or the like can be improved without impairing the lubricating performance during low speed running wherein a delivery oil amount becomes small. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lubricating device for a power transmission mechanism for a vehicle, and in particular, when supplying lubricating oil using a mechanical oil pump, the oil pump can be used without impairing the lubricating performance when traveling at a low speed with a small amount of discharged oil. It relates to a technology that can be miniaturized.

  (a) an oil pump that is mechanically connected to the power transmission mechanism of the vehicle and is rotationally driven to suck and feed the lubricating oil from the oil reservoir; and (b) the lubricating oil pumped from the oil pump. There is known a lubricating device for a vehicle power transmission mechanism, including a lubricating oil passage that supplies a lubrication required portion of the power transmission mechanism through a shaft oil passage provided in a hollow shaft. The device described in Patent Document 1 is an example thereof, and not only the portion of the power transmission mechanism that requires lubrication but also the stator of the motor generator is cooled by flowing out the lubricating oil from the radial holes provided in the hollow shaft. It is like that. In Patent Document 1, the lubricating oil scraped up by the ring gear of the differential device is received and stored by the catch tank, and if necessary, the electromagnetic valve is opened to feed the lubricating oil in the catch tank to the shaft oil passage of the hollow shaft. It is made to flow and used for lubrication.

JP 2003-130189 A

  However, when the lubricating oil is stored in the catch tank by scraping the ring gear in this way, the lubricating oil collection efficiency is poor, and sufficient lubrication is required when traveling at low vehicle speed and high torque, which generally reduces the amount of oil discharged from the oil pump. There is a possibility that performance may not be obtained, and if the amount of the lubricating oil scooped up by the ring gear is increased, energy loss due to rotational resistance increases, so that it is not always possible to obtain excellent efficiency (fuel consumption, etc.) as a whole. Also, when driving at high speeds where the amount of oil discharged from the oil pump increases, the amount of lubricating oil supplied to the part requiring lubrication becomes excessive, and the energy loss increases due to the stirring resistance of the lubricating oil, which may also reduce efficiency. There is.

  The present invention has been made in the background of the above circumstances, and the purpose thereof is to supply a lubricating oil using a mechanical oil pump and lubricate it at a low speed when the amount of discharged oil is small. The oil pump is downsized without impairing the lubrication performance of the engine, and the overall efficiency of fuel consumption is improved.

  In order to achieve such an object, the first invention comprises: (a) an oil pump that is mechanically coupled to a power transmission mechanism of a vehicle and is rotationally driven to suck and feed lubricant oil from an oil reservoir; (b) a power transmission mechanism for a vehicle having a lubricating oil passage that supplies the lubricating oil pumped from the oil pump to a portion requiring lubrication of the power transmission mechanism through a shaft oil passage provided in the hollow shaft. (C) a cooling oil passage that guides the lubricating oil pumped from the oil pump to a position above the hollow shaft and applies it to the stator coil of the rotating machine, and (d) the hollow shaft in the vertical direction. A catch tank disposed between the stator coil and receiving and storing the lubricating oil hung on the stator coil and flowing through the stator coil, and (e) through a radial hole provided in the hollow shaft. Te, and having a a communicating oil passage to communicate fluidly communicating at all times and a bottom of the catch tank and regardless the shaft oil passage in both directions with the rotation of the hollow shaft.

  The “rotating machine” is a rotating electric machine defined in JIS Z9212, and is a motor generator that can be used by switching functions of an electric motor, a generator, or both.

  According to a second aspect of the present invention, in the lubricating device for a vehicle power transmission mechanism according to the first aspect of the invention, (a) the bottom of the catch tank is formed in a cylindrical shape concentrically with the hollow shaft and on the outer peripheral side of the hollow shaft. (B) the hollow shaft is provided at the top of the cylindrical member via the radial hole provided in the hollow shaft. The shaft oil passage is always communicated regardless of the rotation of the catch tank, and a communication hole opened in the lower surface of the catch tank is provided as the communication oil passage.

  According to a third aspect of the present invention, in the lubricating device for a vehicle power transmission mechanism according to the first or second aspect of the present invention, the lubricating oil is exposed to the outside at a relative rotation portion between the communication oil passage and the radial hole of the hollow shaft. A sealing member that seals liquid tightly so as not to leak is provided.

  According to a fourth aspect of the present invention, in the lubricating device for a vehicle power transmission mechanism of any one of the first to third aspects, the lubricating oil in the catch tank is returned to the oil reservoir at a predetermined height position of the catch tank. A return oil passage is connected.

  In such a lubricating device for a power transmission mechanism for a vehicle, a cooling oil passage is provided for guiding the lubricating oil pumped from an oil pump to a position above the hollow shaft and applying it to the stator coil of the rotating machine. Since the lubricating oil that is hung down is received and stored by the catch tank, the lubricating oil is stored more efficiently than when the lubricating oil is stored in the catch tank by scraping up with the ring gear of the differential device. While being able to store, the energy loss by the rotational resistance accompanying scraping is reduced. In addition, since the catch tank and the shaft oil passage of the hollow shaft are always in communication with each other so as to be able to flow in both directions through the communication oil passage, the hydraulic pressure due to the hydraulic head difference (self-weight of the lubricant) in the catch tank, The amount of stored oil (depth) in the catch tank is automatically adjusted so that the hydraulic pressure in consideration of the centrifugal force in the shaft oil passage is balanced. In other words, when the oil pump discharge amount is large and the oil pressure in the shaft oil passage is high, the lubricating oil flows from the shaft oil passage into the catch tank and the amount of oil stored in the catch tank increases. At the same time, the excessive supply of lubricating oil to the parts requiring lubrication is suppressed and energy loss due to increased stirring resistance is reduced. On the other hand, the oil discharge amount of the oil pump is small and the hydraulic pressure in the shaft oil passage is low. In some cases, the lubricating oil in the catch tank flows into the shaft oil passage, and the amount of lubricating oil supplied to the portion requiring lubrication increases accordingly, improving the lubricating performance. This makes it possible to adopt a small, lightweight and inexpensive oil pump with a small discharge capacity without impairing the lubrication performance during low-speed running, where the amount of oil discharged from the oil pump is reduced. Can be improved.

  In the second invention, a cylindrical member is integrally provided at the bottom of the catch tank, and the catch tank and the shaft oil passage are always in communication with each other through a communication hole provided in the cylindrical member. Therefore, the communication structure between the catch tank and the shaft oil passage is simple and compact, and the catch tank can be compactly arranged in a limited space.

  In the third aspect of the invention, the seal member is provided at the relative rotation portion between the communication oil passage and the radial hole of the hollow shaft, and is sealed in a liquid-tight manner so that the lubricating oil does not leak to the outside. The flow (outflow and inflow) of the lubricating oil to and from the shaft oil passage due to the difference in the head of the lubricating oil is appropriately performed according to the rotational speed of the oil pump and the discharge hydraulic pressure, and the predetermined lubricating performance is achieved. It can be obtained stably.

  In the fourth aspect of the invention, since the return oil path for returning the lubricating oil in the catch tank to the oil reservoir is connected, the lubricating oil overflows from the catch tank and is excessively supplied to the power transmission mechanism, etc. The occurrence of energy loss due to the above is suppressed. Further, since the excess lubricating oil is quickly returned to the oil reservoir, it is possible to suppress the generation of noise due to air suction due to the lack of lubricating oil in the oil reservoir.

1 is a skeleton diagram illustrating a schematic configuration of a power transmission mechanism for a hybrid vehicle to which the present invention is applied. FIG. 2 is a cross-sectional view specifically showing the vicinity of a catch tank of a lubricating device provided in the vehicle power transmission mechanism of FIG. 1, where (a) is a vertical cross-sectional view including the axis O of a hollow shaft, and (b) is ( It is an enlarged view of the IIB-IIB cross section in a). It is a figure explaining the other Example of this invention, and is sectional drawing equivalent to the upper part part from the axial center O in (a) of FIG. It is a figure explaining another Example of this invention, and is sectional drawing equivalent to the upper part part from the axial center O in (a) of FIG. It is a figure explaining another Example of this invention, and is sectional drawing equivalent to the upper part part from the axial center O in (a) of FIG.

  The present invention requires lubrication, for example, a stepped transmission such as a planetary gear type or a parallel twin shaft type, a continuously variable transmission such as a belt type, a bevel gear type differential device, a power source switching device of a hybrid vehicle, etc. The present invention can be applied to various power transmission mechanism lubrication devices. The oil pump is a mechanical pump that is mechanically connected to a predetermined rotating element of the power transmission mechanism and is driven to rotate. For example, the oil pump is synchronized with the rotational speed of an engine such as an internal combustion engine that generates power by burning fuel. It is connected to a rotating rotating element and is driven to rotate, but may be connected to another rotating element to be driven to rotate. The rotational speed of the oil pump varies depending on the vehicle speed, for example, and it is desirable that the rotational speed increases as the vehicle speed increases, and the amount of discharged oil increases. Depending on the change characteristics, the rotary element may be connected to a rotary element having a speed change different from the vehicle speed and driven to rotate. In a hybrid vehicle or the like, an electric oil pump can be additionally provided in addition to the mechanical oil pump in order to generate a predetermined oil pressure when the engine is stopped.

  A rotating machine in which a stator coil is cooled by lubricating oil supplied from a cooling oil passage is, for example, an electric motor that is mechanically connected to a power transmission mechanism and applies torque, and is driven to rotate via a power transmission mechanism. However, an electric motor or the like provided separately from the power transmission mechanism having a lubrication required portion to be lubricated by the lubricating oil passage may be used. This rotating machine is arranged concentrically with the hollow shaft, for example, and the lubricating oil is applied to an oiling part (a part that is likely to be hot) located above the hollow shaft. However, it may be arranged on a rotating shaft or the like separately arranged in parallel with the hollow shaft.

  In order to always communicate the radial hole provided in the hollow shaft and the communication oil passage regardless of the rotation of the hollow shaft, the outer peripheral surface of the hollow shaft or the inner peripheral surface of the cylindrical member facing the outer peripheral surface, etc. Is provided with an annular groove as required. The communication oil passage always connects the shaft oil passage and the catch tank so that they can be circulated in both directions in a normal use state such as during traveling. For example, an open / close valve that shuts off the flow for maintenance, testing, etc. May be provided.

  In the second invention, the cylindrical member is integrally provided in the catch tank. However, in implementing the other inventions, the catch tank and the cylindrical member are configured separately and are connected by a communication oil passage such as a pipe. Various modes are possible, such as being able to connect, or forming a part of the communication oil passage in the partition wall portion of the housing and the like so as to communicate with the catch tank without providing a cylindrical member. In the second aspect of the invention, a cylindrical member is provided at the bottom of the catch tank and a communication hole is opened at the bottom of the catch tank. A hole can also be opened on the lower side.

  The seal member of the third invention may be provided as necessary. For example, it is not always necessary to provide the seal member when the amount of leakage of the lubricating oil from the relative rotation portion is small. In addition, even if there is a certain amount of leakage, the lubricating oil may flow from the shaft oil path to the catch tank or the lubricating oil may flow from the catch tank to the shaft oil path in response to changes in the oil pressure in the shaft oil path. If a predetermined lubrication performance is obtained, for example, during low-speed running when the amount of oil discharged from the oil pump is reduced, the sealing member is not necessarily required. The return oil passage of the fourth invention may be provided as necessary. For example, when the possibility of overflow from the catch tank is low or when the overflow hardly affects the stirring resistance, the return oil passage is not necessarily required. Is not necessary. It is also possible to actively use the overflowed lubricating oil for lubrication.

  The cooling oil passage for cooling the stator coil of the rotating machine is provided with, for example, an oil passage such as a pipe extending up to a position above the stator coil so that the lubricating oil can be applied to a portion that tends to be hot such as a terminal block. Can be hung. In addition, it is possible to dispose the lubricating oil on the stator coil by providing a nozzle at the tip, and it is not necessary to provide the cooling oil passage right above the stator coil, so that the arrangement of the cooling oil passage becomes easy. It is also possible to provide a cooling oil passage in the rotor and apply the lubricating oil to the inner peripheral surface of the stator coil by utilizing the centrifugal force generated by the rotation of the rotor. The cooling oil can be used without using a special pipe or nozzle. The road can be constructed and can be implemented relatively easily by modifying existing parts.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic configuration diagram illustrating a power transmission mechanism 10 for a hybrid vehicle to which the present invention is applied. In the power transmission mechanism 10, the torque of the first driving force generation source 12 that is a main driving source is transmitted to an output shaft 14 that functions as an output member, and a pair of left and right via the differential gear device 16 from the output shaft 14. It is transmitted to the drive wheel 18. The first driving force generation source 12 is mainly composed of an engine 24, a first motor generator MG1, and a planetary gear device 26 for synthesizing or distributing torque between the engine 24 and the first motor generator MG1. Has been. The engine 24 is a known internal combustion engine that outputs power by burning fuel such as a gasoline engine or a diesel engine, and is basically controlled according to an output request amount such as an accelerator operation amount. The first motor generator MG1 is, for example, a synchronous motor, and selectively obtains a function as an electric motor that generates drive torque and a function as a generator.

  The planetary gear unit 26 includes a sun gear S0, a ring gear R0 arranged concentrically with the sun gear S0, and a carrier C0 that supports the sun gear S0 and the pinion gear P0 that meshes with the ring gear R0 so as to rotate and revolve freely. It is a single pinion type planetary gear mechanism that is provided as two rotating elements and generates a known differential action. The crankshaft of the engine 24 is connected to the carrier C0 via the damper 28 and the input shaft 30, and the sun gear S0 is disposed concentrically with the input shaft 30 on the outer peripheral side of the input shaft 30. The first motor generator MG1 is connected via a cylindrical connecting shaft 32. An output shaft 14 is connected to the ring gear R0.

  The power transmission mechanism 10 is also provided with a second motor generator MG2 as a second driving force generation source capable of selectively executing power running control for outputting driving force for traveling and regenerative control for recovering energy. The second motor generator MG2 is connected to the output shaft 14 via the automatic transmission 22. The automatic transmission 22 is constituted by a set of Ravigneaux type planetary gear mechanisms. That is, the first sun gear S1 and the second sun gear S2 are provided, and the short pinion P1 meshes with the first sun gear S1, and the short pinion P1 meshes with the long pinion P2 having a longer axial length, and the long The pinion P2 meshes with the ring gear R1. Each of the pinions P1 and P2 is held by a common carrier C1 so as to rotate and revolve. Further, the second sun gear S2 meshes with the long pinion P2.

The second sun gear S2 is connected to the second motor generator MG2 via a cylindrical connecting shaft 20 concentrically with the output shaft 14 and disposed on the outer peripheral side of the output shaft 14 so as to be relatively rotatable. C 1 is connected to the output shaft 14. Further, the first sun gear S1 is selectively fixed to the housing 34 via the first brake B1 and is stopped from rotating. The ring gear R1 is selectively connected to the housing 34 via the second brake B2. The rotation is stopped by being fixed to. When these brakes B1 and B2 are selectively engaged, the high gear stage H and the low gear stage L having different gear ratios γs (= rotational speed NMG2 / MG2 rotational speed N _OUT ) of the output shaft 14 are different. Two gear stages are established.

  The engine 24, the first motor generator MG1, the planetary gear device 26, the second motor generator MG2, and the automatic transmission 22 are provided concentrically with each other. Since the planetary gear unit 26 and the automatic transmission 22 are substantially symmetrical with respect to the center line, the lower half of them is omitted in FIG. 1 except for the carrier C0 of the planetary gear unit 26. . Also for the first motor generator MG1 and the second motor generator MG2, the lower half of the center line is omitted.

  The power transmission mechanism 10 is provided with a lubricating device 40 having a lubricating oil passage 42 and a cooling oil passage 44 indicated by broken lines. The lubrication device 40 includes an oil pump 50 that is mechanically coupled to the power transmission mechanism 10 and is rotationally driven to suck the lubricating oil from an oil reservoir 46 such as an oil pan and pump it to the discharge oil passage 48. Yes. Specifically, the oil pump 50 is rotationally driven via gears 52 and 54 by the carrier C0 of the planetary gear device 26 integrally connected to the input shaft 30. That is, the rotational speed is driven in synchronization with the rotational speed of the engine 24. Basically, the rotational speed is increased or decreased according to the vehicle speed so that the amount of discharged oil increases as the vehicle speed increases.

  The oil pump 50 and the discharge oil passage 48 are provided, for example, so as to be built in a partition wall 56 provided in the housing 34, and branch from the discharge oil passage 48 so that the lubricating oil passage 42 and the cooling oil passage 44 are provided. Is provided. The lubricating oil passage 42 is for supplying lubricating oil to the gear-engaged portion of the automatic transmission 22 and the parts requiring lubrication such as the friction material of the brakes B1 and B2, and the cooling oil passage 44 is the second oil passage 44. This is for cooling the stator coil 58 of the motor generator MG2. FIG. 2 is a cross-sectional view specifically illustrating the lubricating device 40 of the present embodiment, where (a) is a vertical cross-sectional view including the axis O of the output shaft 14, and (b) is IIB − in (a). It is an enlarged view of IIB section.

  As is apparent from FIG. 2, the lubricating oil passage 42 is connected to the output shaft 14 in the shaft oil passage 60 provided in the axial direction on the axis O of the output shaft 14 or the inner peripheral portion of the automatic transmission 22. A large number of discharge holes 62 provided in the radial direction and a connection shaft 20 provided on the outer peripheral side of the output shaft 14 are configured to include a number of discharge holes 64 provided in the same radial direction. Then, when the lubricating oil is discharged to the outside through the discharge holes 62 and 64, the gear meshing portion and the bearing of the automatic transmission 22, the friction materials of the brakes B1 and B2, and the like are lubricated. If necessary, a lubricating oil passage is also provided in the carrier C1 and the like. The output shaft 14 provided with the shaft oil passage 60 corresponds to a hollow shaft.

  The cooling oil passage 44 is provided upward in the partition wall 56 continuously to the discharge oil passage 48, and an oil supply pipe 66 connected to the oil passage in the partition wall 56 above the second motor generator MG2. I have. The oil supply pipe 66 is arranged to extend to the opposite side so as to straddle the stator 68 of the second motor generator MG2, and is used to apply lubricating oil targeting a portion that is likely to be hot, such as a terminal block of the stator coil 58. Can be hung. The second motor generator MG2 in which the stator coil 58 is cooled by the cooling oil passage 44 corresponds to a rotating machine.

  The lubricating oil that is hung on the stator coil 58 and flows down is received and stored at the position directly above the output shaft 14 on the inner peripheral side of the stator coil 58, that is, below the oiling portion where the lubricating oil is applied. A catch tank 70 is provided. The catch tank 70 is disposed at a fixed position by a partition wall 72 (see FIG. 1) provided in the housing 34 and the bottom of the catch tank 70 is cylindrical and concentric with the output shaft 14. In addition, a cylindrical portion 74 is integrally provided on the outer peripheral side of the output shaft 14 so as to be relatively rotatable. In this embodiment, as is apparent from FIG. 2 (b), the cylindrical portion 74 is fitted on the outer peripheral side of the connecting shaft 20 disposed on the outer peripheral side of the output shaft 14 so as to be relatively rotatable. Are combined. A communication hole 76 is provided in the upper portion of the cylindrical portion 74 so as to open to the lower surface of the catch tank 70, and a plurality (two in the drawing) provided in the output shaft 14 and the connecting shaft 20 respectively. The catch tank 70 and the shaft oil passage 60 are communicated with each other through the radial holes 78 and 80 so as to be able to flow in both directions. The communication hole 76 and the radial holes 78 and 80 are provided at substantially the same position in the axial direction of the output shaft 14. The cylindrical portion 74 corresponds to a cylindrical member, and the communication hole 76 corresponds to a communication oil passage.

  An annular groove 82 is provided on the outer peripheral surface of the output shaft 14 and the opening portion of the radial hole 78, and the annular groove 84 is provided on the inner peripheral surface of the cylindrical portion 74 and the opening portion of the communication hole 76. The catch tank 70 and the shaft oil passage 60 are always in communication with each other regardless of the rotation of the output shaft 14 and the connecting shaft 20. Thus, the amount of oil stored in the catch tank 70 (the amount of oil stored in the catch tank 70 is balanced so that the hydraulic pressure due to the hydraulic head difference (self-weight of the lubricating oil) in the catch tank 70 and the hydraulic pressure taking into account the centrifugal force in the shaft oil passage 60 are balanced. Depth) is automatically adjusted. That is, when the oil pump 50 discharges a large amount of oil and the oil pressure increases, the lubricating oil flows from the shaft oil passage 60 into the catch tank 70 and the amount of oil stored in the catch tank 70 increases. When traveling at low speed when the amount of oil discharged from the pump 50 is small and the hydraulic pressure is low, the lubricating oil in the catch tank 70 flows into the shaft oil passage 60 and the amount of stored oil decreases.

  Seal members 86 and 88 are provided at a relative rotation portion between the communication hole 76 and the radial hole 78 of the output shaft 14 so as to seal the fluid tightly so that the lubricating oil does not leak to the outside. The seal members 86 are for liquid-tight sealing between the outer peripheral surface of the output shaft 14 and the inner peripheral surface of the connecting shaft 20, and a pair of seal members 86 are provided so as to be positioned on both sides of the radial holes 78 and 80. Yes. The seal member 88 is for liquid-tightly sealing between the outer peripheral surface of the connecting shaft 20 and the inner peripheral surface of the cylindrical portion 74, and a pair of seal members 88 is positioned on both sides of the radial hole 80 and the communication hole 76. Is provided.

  In addition, an oil return pipe 90 that returns to the oil reservoir 46 is connected to a predetermined height position of the catch tank 70, that is, in the vicinity of the upper end, so that the lubricating oil in the catch tank 70 does not overflow. The oil return pipe 90 corresponds to a return oil passage and is disposed up to the oil reservoir 46. It is also possible to provide a return oil path using the partition wall 72 or the like.

  Such a lubrication apparatus 40 is provided with a cooling oil passage 44 that guides the lubricating oil pumped from the oil pump 50 to a position above the output shaft 14 and applies it to the stator coil 58 of the second motor generator MG2. Since the lubricating oil that is hung on the coil 58 and flows down is received and stored by the catch tank 70, the lubricating oil is stored in the catch tank 70 as compared with the case where the lubricating oil is stored in the catch tank 70 by scraping with a ring gear or the like. While being able to store efficiently, the energy loss by the rotational resistance accompanying scraping is reduced. Further, the catch tank 70 and the shaft oil passage 60 of the output shaft 14 are always in communication with each other through the communication hole 76 and the radial holes 78 and 80 so as to be able to flow in both directions. During high speed travel where the amount of oil in the shaft oil passage 60 increases, the lubricating oil flows out from the shaft oil passage 60 into the catch tank 70 to increase the amount of oil stored in the catch tank 70, and the automatic transmission. The excessive supply of lubricating oil to the lubrication-necessary parts such as 22 is suppressed, and the energy loss due to the increase in the stirring resistance is reduced. On the other hand, when traveling at low speed when the amount of oil discharged from the oil pump 50 is small and the hydraulic pressure in the shaft oil passage 60 becomes low, the lubricating oil in the catch tank 70 flows into the shaft oil passage 60 and is supplied to the portion requiring lubrication. Lubricating performance is improved by increasing the amount of lubricating oil. This makes it possible to adopt a small, lightweight and inexpensive oil pump 50 with a small discharge capacity without impairing the lubrication performance during low-speed running where the amount of oil discharged from the oil pump 50 is reduced. Efficiency can be improved.

  In the present embodiment, a cylindrical portion 74 is integrally provided at the bottom of the catch tank 70, and the catch tank 70 and the shaft oil passage 60 are connected to each other through a communication hole 76 provided in the cylindrical portion 74. Since the communication is always possible, the communication structure between the catch tank 70 and the shaft oil passage 60 is simple and compact, and the catch tank 70 can be compactly arranged in a limited space.

  Further, in this embodiment, seal members 86 and 88 are provided at a relative rotation portion between the communication hole 76 and the radial hole 78 of the output shaft 14, and are sealed in a liquid-tight manner so that the lubricating oil does not leak to the outside. Therefore, the flow (outflow and inflow) of the lubricating oil to and from the shaft oil passage 60 due to the head difference of the lubricating oil in the catch tank 70 is appropriate according to the vehicle speed, that is, the rotational speed of the oil pump 50 and further the discharge hydraulic pressure. The predetermined lubrication performance can be stably obtained.

  Further, in this embodiment, since the oil return pipe 90 that returns the lubricating oil in the catch tank 70 to the oil reservoir 46 is connected, the lubricating oil overflows from the catch tank 70, and the connecting shaft 20 and the second motor generator MG2. The occurrence of energy loss due to stirring resistance or the like due to excessive application to the rotor 92 or the like is suppressed.

  Further, since the excess lubricating oil is quickly returned to the oil reservoir 46 by the oil return pipe 90, it is possible to suppress the generation of noise due to air suction due to the lack of lubricating oil in the oil reservoir 46.

  In the present embodiment, an oil supply pipe 66 extending to a position directly above the stator coil 58 is provided as a cooling oil passage 44 for cooling the stator coil 58 of the second motor generator MG2. Therefore, it is possible to apply the lubricating oil aiming at a portion that tends to be high temperature such as a terminal block, and the stator coil 58 can be cooled efficiently.

  Next, another embodiment of the present invention will be described. In the following embodiments, portions that are substantially common to the above embodiments are denoted by the same reference numerals, and detailed description thereof is omitted.

  3 to 5 are cross-sectional views corresponding to the upper part of the axis O in FIG. 2A, and the embodiment of FIG. 3 has a cooling oil passage 44 as compared with the first embodiment. This is a case where the oil supply pipe 100 is short and the lubricating oil is blown off by the nozzle 102 and applied to the stator coil 58. In this case, as compared with the case where the oil supply pipe 66 is provided just above the stator coil 58 as in the first embodiment, the arrangement of the oil supply pipe 100 is facilitated.

  In FIG. 4, the oil supply oil passage 104 is provided in the stator 68 of the second motor generator MG <b> 2 without providing the oil supply pipe 66 or 100, and the lubricating oil is discharged from the oil supply oil passage 104 and applied to the stator coil 58. In some cases, the cooling oil passage 44 can be configured without using a special pipe or nozzle, and can be implemented relatively easily by modifying existing parts. Instead of providing the oil supply oil passage 104 in the stator 68, it is also possible to provide an oil supply oil passage in the housing 34 and apply the lubricating oil to the stator coil 58.

  FIG. 5 shows a case where an oil supply oil passage 106 is provided in the rotor 92 of the second motor generator MG2, and the lubricating oil is applied to the inner peripheral surface of the stator coil 58 using the centrifugal force generated by the rotation of the rotor 92. The cooling oil passage 44 can be configured without using pipes or nozzles, and can be implemented relatively easily by modifying existing parts.

  As mentioned above, although the Example of this invention was described in detail based on drawing, these are one Embodiment to the last, This invention is implemented in the aspect which added the various change and improvement based on the knowledge of those skilled in the art. be able to.

  10: Power transmission mechanism 14: Output shaft (hollow shaft) 22: Automatic transmission (portion requiring lubrication) 40: Lubricating device 42: Oil passage for lubrication 44: Oil passage for cooling 46: Oil reservoir 50: Oil pump 58: Stator Coil 60: Shaft oil passage 70: Catch tank 74: Tubular portion (tubular member) 76: Communication hole (communication oil passage) 78: Radial hole 86, 88: Seal member 90: Oil return pipe (return oil passage) MG2: Second motor generator (rotary machine) O: Center axis

Claims (4)

An oil pump that is mechanically coupled to a power transmission mechanism of the vehicle and is rotationally driven to suck and feed the lubricating oil from an oil reservoir;
A lubricating oil passage for supplying the lubricating oil pumped from the oil pump to a portion requiring lubrication of the power transmission mechanism via a shaft oil passage provided in the hollow shaft;
In a lubricating device for a vehicle power transmission mechanism having
A cooling oil passage that guides the lubricating oil pumped from the oil pump to the upper position of the hollow shaft and applies it to the stator coil of the rotating machine;
A catch tank that is disposed between the hollow shaft and the stator coil in the vertical direction and receives and stores the lubricating oil hung on the stator coil and flowing down;
A communication oil passage that constantly communicates the shaft oil passage and the bottom portion of the catch tank in both directions through a radial hole provided in the hollow shaft, regardless of the rotation of the hollow shaft;
A vehicular power transmission mechanism lubrication device comprising: At the bottom of the catch tank, a cylindrical member is formed integrally with the hollow shaft, concentrically with the hollow shaft and disposed on the outer peripheral side of the hollow shaft so as to be relatively rotatable.
The upper part of the cylindrical member is always in communication with the shaft oil passage through the radial hole provided in the hollow shaft regardless of the rotation of the hollow shaft, and is opened on the lower surface of the catch tank. The lubricating device for a vehicle power transmission mechanism according to claim 1, wherein the communication hole is provided as the communication oil passage. The seal member which seals fluid-tightly so that lubricating oil may not leak outside is provided in the relative rotation part between the communicating oil passage and the diameter direction hole of the hollow shaft. A lubricating device for a vehicle power transmission mechanism according to 1 or 2. The return oil path for returning the lubricating oil in the catch tank to the oil reservoir is connected to the predetermined height position of the catch tank. Lubricating device for vehicle power transmission mechanism.

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