JP5747779B2 - Lubricator for power transmission device - Google Patents

Description

  The present invention relates to a lubricating device for a power transmission device.

  2. Description of the Related Art Conventionally, a technique for supplying lubricating oil to a power transmission device of a hybrid vehicle by an oil pump driven by engine rotation is known. For example, Patent Document 1 discloses a technique of a hybrid vehicle in which an output shaft of an engine is connected to a drive shaft of an oil pump via a one-way clutch.

JP-A-8-324262

  Since the engine is stopped during EV travel, the oil pump is stopped. This may cause insufficient lubrication or insufficient cooling of the lubricated part. It is desired that lubricating oil can be supplied during EV traveling.

  An object of the present invention is to provide a lubricating device for a power transmission device that can supply lubricating oil to the power transmission device during EV traveling.

  A lubricating device for a power transmission device according to the present invention includes a planetary gear mechanism, an oil pump that is driven to rotate and discharges lubricating oil, and a one-way clutch. The sun gear of the planetary gear mechanism is in the first rotating electrical machine, and the carrier is The ring gear is connected to the engine and the driving wheel and the second rotating electric machine, respectively, the oil pump is connected to the first rotating electric machine via the one-way clutch, and the one-way clutch moves forward of the hybrid vehicle. The oil pump is driven to rotate by transmitting the rotation of the first rotating electric machine when the first rotating electric machine rotates in the negative direction with the rotation direction of the ring gear at the time as the positive direction.

  The lubricating device for the power transmission device further includes a second one-way clutch that connects the engine and the oil pump, and the second one-way clutch rotates the engine when the engine rotates in a forward direction. Rotation of the first rotating electrical machine transmitted to the oil pump and transmitted via the one-way clutch when the rotational speed in the negative direction of the first rotating electrical machine is higher than the rotational speed in the positive direction of the engine Rotates the oil pump, and when the rotational speed in the positive direction of the engine is higher than the rotational speed in the negative direction of the first rotating electrical machine, the engine is transmitted via the second one-way clutch. The rotation preferably drives the oil pump.

  The lubricating device of the power transmission device preferably further includes a second oil pump connected to the engine and driven to rotate by rotation of the engine to discharge the lubricating oil.

  In the lubricating device for the power transmission device, it is preferable that the oil pump and the second oil pump are disposed adjacent to each other on the same axis.

  A lubricating device for a power transmission device according to the present invention includes a planetary gear mechanism, an oil pump that is driven to rotate and discharges lubricating oil, and a one-way clutch. The sun gear of the planetary gear mechanism is connected to the first rotating electrical machine, the carrier is connected to the engine, and the ring gear is connected to the drive wheel and the second rotating electrical machine. The oil pump is connected to the first rotating electrical machine via a one-way clutch. The one-way clutch transmits the rotation of the first rotating electric machine when the first rotating electric machine rotates in the negative direction with the rotation direction of the ring gear during forward traveling of the hybrid vehicle as the positive direction, and rotates the oil pump. Therefore, according to the lubricating device of the power transmission device according to the present invention, there is an effect that the oil can be supplied to the power transmission device by the oil pump during EV traveling.

FIG. 1 is a skeleton diagram showing the main part of the hybrid vehicle of the first embodiment. FIG. 2 is a collinear diagram of the planetary gear mechanism during EV travel. FIG. 3 is a collinear diagram at the time of power split by HV traveling. FIG. 4 is an alignment chart during power circulation by HV traveling. FIG. 5 is an alignment chart at the time of stationary power generation. FIG. 6 is a skeleton diagram showing the main part of the hybrid vehicle of the second embodiment. FIG. 7 is a cross-sectional view of the vicinity of the oil pump. FIG. 8 is a conceptual diagram of a lubricating oil supply path in the lubricating device of the power transmission device according to the second embodiment. FIG. 9 is a view showing a lubricating device of a power transmission device having an oil pump arranged radially inward of the ring gear. FIG. 10 is a cross-sectional view showing a main part of the lubricating device of the power transmission device.

  Hereinafter, a lubricating device for a power transmission device according to an embodiment of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

[First Embodiment]
The first embodiment will be described with reference to FIGS. 1 to 5. The present embodiment relates to a lubricating device for a power transmission device. FIG. 1 is a skeleton diagram showing the main part of the hybrid vehicle according to the first embodiment.

  A lubricating device 1-1 of the power transmission device of the present embodiment shown in FIG. 1 includes a planetary gear mechanism 10, an oil pump 3, a first one-way clutch 4, and a second one-way clutch 5. The power transmission device of the hybrid vehicle 100 includes a planetary gear mechanism 10, a first rotating electrical machine MG1, a second rotating electrical machine MG2, a counter drive gear 15, a counter driven gear 23, a drive pinion gear 24, a reduction gear 25, and a diff ring gear 26. And a differential mechanism 27.

  The rotating shaft 2 of the engine 1 extends from the engine 1 toward one side in the axial direction. The rotating shaft 2 extends in the vehicle width direction of the hybrid vehicle 100, for example. The engine 1 converts the combustion energy of the fuel into a rotary motion and outputs it to the rotary shaft 2.

  The planetary gear mechanism 10 is a power split planetary gear that splits the torque of the engine 1 into the drive wheels 29 and the first rotating electrical machine MG1. The planetary gear mechanism 10 is a single pinion type, and includes a sun gear 11, a pinion gear 12, a ring gear 13, and a carrier 14. The sun gear 11 is arranged coaxially with the rotary shaft 2. The ring gear 13 is coaxial with the sun gear 11 and is disposed on the radially outer side of the sun gear 11. The pinion gear 12 is disposed between the sun gear 11 and the ring gear 13 and meshes with the sun gear 11 and the ring gear 13, respectively. The pinion gear 12 is rotatably supported by the carrier 14. The carrier 14 is connected to the rotating shaft 2 and rotates integrally with the rotating shaft 2. Therefore, the pinion gear 12 can rotate (revolve) around the central axis of the rotary shaft 2 together with the carrier 14, and can be supported by the carrier 14 and rotated (rotated) around the central axis of the pinion gear 12.

  The sun gear 11 is connected to the rotor shaft 6 of the first rotating electrical machine MG1. The first rotating electrical machine MG1 is coaxial with the rotating shaft 2 and is disposed on the opposite side to the engine 1 side with the planetary gear mechanism 10 interposed therebetween. The rotor shaft 6 is a rotating shaft of the rotor of the first rotating electrical machine MG1 and extends in the axial direction of the engine 1. The rotor shaft 6 has a hollow cylindrical shape, and the rotation shaft 2 of the engine 1 penetrates the rotor shaft 6 in the axial direction.

  The ring gear 13 is an internal gear, and a counter drive gear 15 is disposed on the outer peripheral surface of the ring gear 13. The ring gear 13 and the counter drive gear 15 constitute a compound gear that rotates integrally.

  The counter drive gear 15 meshes with the counter driven gear 23. Further, the counter driven gear 23 meshes with the reduction gear 25. The reduction gear 25 is a gear connected to the rotor shaft 30 of the second rotating electrical machine MG2. The reduction gear 25 has a smaller diameter than the counter driven gear 23, and decelerates the rotation of the second rotating electrical machine MG <b> 2 and transmits it to the counter driven gear 23. The ring gear 13 is connected to the second rotating electrical machine MG2 via the counter drive gear 15, the counter driven gear 23, and the reduction gear 25.

  The drive pinion gear 24 is disposed coaxially with the counter driven gear 23 and rotates integrally with the counter driven gear 23. The torque of the engine 1 and the first rotating electrical machine MG1 transmitted from the counter drive gear 15 to the counter driven gear 23 and the torque of the second rotating electrical machine MG2 transmitted from the reduction gear 25 to the counter driven gear 23 are combined. It is transmitted to the drive pinion gear 24.

  The drive pinion gear 24 meshes with the diff ring gear 26. The differential ring gear 26 is connected to the output shaft 28 via a differential mechanism 27. Output shaft 28 is connected to drive wheels 29 of hybrid vehicle 100. That is, the ring gear 13 is connected to the drive wheel 29 via the counter drive gear 15, the counter driven gear 23, the drive pinion gear 24, the diff ring gear 26, the differential mechanism 27 and the output shaft 28.

  The first rotating electrical machine MG1 and the second rotating electrical machine MG2 each have a function as a motor (electric motor) and a function as a generator. The first rotating electrical machine MG1 and the second rotating electrical machine MG2 are connected to a battery via an inverter. The first rotating electrical machine MG1 and the second rotating electrical machine MG2 can convert the electric power supplied from the battery into mechanical power and output it, and are driven by the input power to convert the mechanical power into electric power. Can be converted. The electric power generated by the rotating electrical machines MG1 and MG2 can be stored in the battery. As the first rotating electrical machine MG1 and the second rotating electrical machine MG2, for example, an AC synchronous motor generator can be used.

  The oil pump 3 discharges lubricating oil when the pump shaft 9 is rotationally driven. Lubricating oil discharged from the oil pump 3 is supplied to a lubricated portion of a power transmission device such as the planetary gear mechanism 10, the first rotating electrical machine MG1, and the second rotating electrical machine MG2. As the oil pump 3, for example, a trochoid oil pump can be used. The oil pump 3 is disposed at the end of the rotating shaft 2 opposite to the engine 1 side in the axial direction. The oil pump 3 is disposed on the opposite side of the first rotating electrical machine MG1 from the engine 1 side in the axial direction, and faces the first rotating electrical machine MG1 in the axial direction.

  The pump shaft 9 extends in the axial direction from the main body of the oil pump 3 toward the engine 1 side. A first one-way clutch 4 and a second one-way clutch 5 are arranged on the pump shaft 9. The first one-way clutch 4 is disposed closer to the engine 1 than the second one-way clutch 5.

  The first one-way clutch 4 is interposed between the rotor shaft 6 and the pump shaft 9. More specifically, the pump shaft 9 of the oil pump 3 is connected to the rotor shaft 6 of the first rotating electrical machine MG1 via the first one-way clutch 4, the pump driven gear 8, and the pump drive gear 7. The inner ring of the first one-way clutch 4 is connected to the pump shaft 9, and the outer ring is connected to the pump driven gear 8. The pump driven gear 8 is arranged coaxially with the pump shaft 9 and meshes with the pump drive gear 7. The pump drive gear 7 is a gear connected to the rotor shaft 6 of the first rotating electrical machine MG1. The pump drive gear 7 is disposed at the end of the rotor shaft 6 opposite to the engine 1 side in the axial direction. The gear ratio between the pump drive gear 7 and the pump driven gear 8 can be set to 1, for example.

  The first one-way clutch 4 transmits the rotation of the rotor shaft 6 when the rotor shaft 6 rotates in the negative direction to the pump shaft 9, and the rotation of the rotor shaft 6 when the rotor shaft 6 rotates in the positive direction is the pump shaft. 9 is regulated. Here, the positive rotation direction is the rotation direction of the ring gear 13 when the hybrid vehicle 100 travels forward, and the negative rotation direction is the rotation direction opposite to the positive rotation direction. The oil pump 3 discharges lubricating oil when the pump shaft 9 is rotationally driven in the forward direction. That is, “rotating and driving the oil pump 3” indicates that the pump shaft 9 is driven to rotate in the forward direction.

  When the rotor shaft 6 rotates in the negative direction, the pump drive gear 7 rotates in the negative direction together with the rotor shaft 6, and the pump driven gear 8 that meshes with the rotor rotates in the positive direction. The first one-way clutch 4 is engaged when the pump driven gear 8 rotates in the forward direction relative to the pump shaft 9 and transmits the rotation of the pump driven gear 8 in the forward direction to the pump shaft 9. On the other hand, when the rotor shaft 6 rotates in the positive direction, the pump drive gear 7 rotates in the positive direction, and the pump driven gear 8 rotates in the negative direction. The first one-way clutch 4 is opened when the pump driven gear 8 rotates in the negative direction relative to the pump shaft 9 to separate the pump driven gear 8 and the pump shaft 9. As a result, the transmission of power between the pump driven gear 8 and the pump shaft 9 is interrupted, and the pump driven gear 8 rotates idle. Thus, the first one-way clutch 4 transmits the rotation of the first rotating electrical machine MG1 when the first rotating electrical machine MG1 rotates in the negative direction and rotationally drives the oil pump 3. In other words, The rotation of the first rotating electrical machine MG1 is transmitted when the first rotating electrical machine MG1 becomes the driving side with respect to the oil pump 3 and the oil pump 3 can be rotationally driven.

  The second one-way clutch 5 is interposed between the rotating shaft 2 of the engine 1 and the pump shaft 9. More specifically, the pump shaft 9 of the oil pump 3 is connected to the rotating shaft 2 of the engine 1 through the second one-way clutch 5, the driven sprocket 21, the chain 22 and the drive sprocket 20.

  The inner ring of the second one-way clutch 5 is connected to the pump shaft 9 and the outer ring is connected to the driven sprocket 21. The driven sprocket 21 is arranged coaxially with the pump shaft 9. A drive sprocket 20 is connected to the end of the rotating shaft 2 opposite to the engine 1 side. An endless chain 22 is spanned between the drive sprocket 20 and the driven sprocket 21. Power is transmitted between the drive sprocket 20 and the driven sprocket 21 via the chain 22. The gear ratio between the drive sprocket 20 and the driven sprocket 21 can be set to 1, for example. Note that the gear ratio γ1 between the pump drive gear 7 and the pump driven gear 8 and the gear ratio γ2 between the drive sprocket 20 and the driven sprocket 21 may be matched so that the gear ratios γ1 and γ2 are different from 1. Good. For example, the gear ratios γ1 and γ2 may be determined so that loss in the oil pump 3 can be reduced.

  The second one-way clutch 5 transmits the rotation of the rotation shaft 2 when the rotation shaft 2 rotates in the positive direction to the pump shaft 9, and the rotation of the rotation shaft 2 when the rotation shaft 2 rotates in the negative direction 9 is regulated. When the rotary shaft 2 rotates in the forward direction, the drive sprocket 20 rotates in the forward direction, and in conjunction with this, the driven sprocket 21 rotates in the forward direction. The second one-way clutch 5 is engaged when the driven sprocket 21 rotates in the forward direction relative to the pump shaft 9 and transmits the rotation of the driven sprocket 21 in the forward direction to the pump shaft 9. On the other hand, the second one-way clutch 5 is opened when the driven sprocket 21 rotates relative to the pump shaft 9 in the negative direction to separate the driven sprocket 21 and the pump shaft 9. As a result, transmission of power between the driven sprocket 21 and the pump shaft 9 is interrupted, and the driven sprocket 21 rotates idly. That is, the second one-way clutch 5 transmits the rotation of the engine 1 to the oil pump 3 when the engine 1 rotates in the forward direction. In other words, the engine 1 is connected to the oil pump 3 on the driving side. Thus, the rotation of the engine 1 when the oil pump 3 can be rotationally driven is transmitted.

  Therefore, when the rotational speed in the negative direction of the first rotating electrical machine MG1 is higher than the rotational speed in the positive direction of the engine 1, the rotation of the first rotating electrical machine MG1 transmitted through the first one-way clutch 4 is the oil pump. 3 is driven to rotate. If the rotational speed in the negative direction of the first rotating electrical machine MG1 is higher than the rotational speed in the positive direction of the engine 1, the rotational speed of the pump driven gear 8 is higher than the rotational speed of the driven sprocket 21. Thereby, the first one-way clutch 4 is engaged and the second one-way clutch 5 is idled. That is, the oil pump 3 is rotationally driven by the rotation of the first rotating electrical machine MG1 transmitted via the first one-way clutch 4.

  When the rotational speed in the positive direction of the engine 1 is higher than the rotational speed in the negative direction of the first rotating electrical machine MG1, the rotation of the engine 1 transmitted through the second one-way clutch 5 rotates the oil pump 3. To drive. When the rotational speed in the positive direction of the engine 1 is higher than the rotational speed in the negative direction of the first rotating electrical machine MG 1, the rotational speed of the driven sprocket 21 is higher than the rotational speed of the pump driven gear 8. As a result, the first one-way clutch 4 idles and the second one-way clutch 5 is engaged. That is, the oil pump 3 is rotationally driven by the rotation of the engine 1 transmitted via the second one-way clutch 5.

  The hybrid vehicle 100 can selectively execute hybrid traveling or EV traveling. The hybrid travel is a travel mode in which the hybrid vehicle 100 travels using at least the engine 1 of the engine 1, the first rotating electrical machine MG1, or the second rotating electrical machine MG2. The first rotating electrical machine MG1 functions as a reaction force receiver for the engine 1 and transmits the torque of the engine 1 from the carrier 14 to the ring gear 13. In hybrid travel, in addition to the engine 1, the second rotating electrical machine MG2 may be used as a power source. In the hybrid travel, the second rotating electrical machine MG2 may function as a generator, or may idle in an unloaded state.

  The EV travel is a travel mode in which the engine 1 is stopped and travel is performed using at least one of the first rotating electrical machine MG1 and the second rotating electrical machine MG2 as a power source. In EV traveling, at least one of the first rotating electrical machine MG1 and the second rotating electrical machine MG2 may generate power depending on the traveling state, the state of charge of the battery, or the like. At least one of the second rotating electrical machines MG2 may idle.

  The lubricating device 1-1 of the power transmission device of the present embodiment supplies the lubricating oil by rotationally driving the oil pump 3 by the rotation of the first rotating electrical machine MG1 when the first rotating electrical machine MG1 rotates in the negative direction. Can do. 2. Description of the Related Art Conventionally, a hybrid vehicle is known that includes an oil pump (hereinafter referred to as an “engine oil pump”) that is driven by engine rotation to discharge lubricating oil. In such a hybrid vehicle, the engine oil pump is also stopped along with the stop of the engine during EV traveling, so that the supply of lubricating oil may be insufficient.

  For example, when the second rotating electrical machine MG2 is arranged at the upper part of the power transmission device, there is a possibility that the supply of lubricating oil to the second rotating electrical machine MG2 is insufficient during EV traveling. In the multi-shaft power transmission device in which the first rotating electrical machine MG1 and the second rotating electrical machine MG2 are disposed on different axes, when the second rotating electrical machine MG2 is disposed at the top, lubricating oil for the second rotating electrical machine MG2 It is desirable to be able to secure the supply of Further, in the plug-in hybrid vehicle, since the EV traveling region is wide, there is a problem that insufficient supply of lubricating oil to the second rotating electrical machine MG2 is likely to occur.

  On the other hand, it is conceivable to secure a lubricating oil supply amount during EV traveling by adding an electric oil pump. However, there is a problem that adding an electric oil pump leads to an increase in cost.

(Lubrication oil supply during EV running)
According to the lubricating oil supply device 1-1 of the power transmission device of the present embodiment, the oil pump 3 can be rotationally driven by the rotation of the first rotating electrical machine MG1 during EV traveling. Thereby, it is possible to supply lubricating oil to each part of the power transmission device including the second rotating electrical machine MG2 during EV traveling.

  FIG. 2 is a collinear diagram of the planetary gear mechanism 10 during EV traveling. In FIG. 2, the vertical axis indicates the number of rotations of each rotating element. In FIG. 2, symbol S indicates the rotational speed of the sun gear 11 and the first rotating electrical machine MG <b> 1, symbol C indicates the rotational speed of the carrier 14 and the engine 1, and symbol R indicates the rotational speed of the ring gear 13. During EV travel, the engine 1 stops operating, and the hybrid vehicle 100 travels with the output torque of the second rotating electrical machine MG2. Accordingly, the ring gear 13 rotates in the positive direction and the carrier 14 stops, so that the sun gear 11 and the rotor shaft 6 of the first rotating electrical machine MG1 rotate in the negative direction. In this case, since the rotational speed in the negative direction of the first rotating electrical machine MG1 is higher than the rotational speed in the positive direction of the engine 1, the rotation of the first rotating electrical machine MG1 transmitted through the first one-way clutch 4 is oil. The pump 3 is driven to rotate. At this time, the second one-way clutch 5 idles, so that the engine 1 is kept in a stopped state.

  Therefore, the lubricating oil can be appropriately supplied to each part of the power transmission device including the second rotating electrical machine MG2 by the lubricating oil pumped by the oil pump 3 during EV traveling. Further, the rotational speed of the first rotating electrical machine MG1 increases as the vehicle speed increases. Therefore, the supply amount of the lubricating oil by the oil pump 3 is increased at the high vehicle speed than at the low vehicle speed.

(Lubrication oil supply during HV driving)
Next, the supply of lubricating oil in other travel modes will be described. FIG. 3 is a nomographic chart at the time of power splitting by HV traveling, and FIG. 4 is a nomographic chart at the time of power circulation by HV traveling. 3 and 4 show collinear charts during THS (Toyota Hybrid System) travel as the HV travel mode. As shown in FIG. 3, if the rotation (S axis) of the first rotating electrical machine MG1 and the sun gear 11 is normal during HV traveling, the power of the engine 1 is transmitted to the first rotating electrical machine MG1 via the sun gear 11. The power is split into power and power transmitted to the drive wheels 29 via the ring gear 13 (R axis). The first rotating electrical machine MG1 functions as a reaction force receiver of the engine 1 and generates electric power to generate negative torque.

  Since the first rotating electrical machine MG1 rotates positively, the rotational speed in the negative direction of the first rotating electrical machine MG1 is zero. That is, the rotational speed in the positive direction of the engine 1 is higher than the rotational speed in the negative direction of the first rotating electrical machine MG1. Accordingly, the first one-way clutch 4 idles, and the rotation of the engine 1 transmitted through the second one-way clutch 5 drives the oil pump 3 to rotate.

  As shown in FIG. 4, when the first rotating electrical machine MG1 and the sun gear 11 (S-axis) rotate negatively during HV traveling, the first rotating electrical machine MG1 generates a negative torque and enters a power running state in which it rotates negatively. . In this case, the second rotating electrical machine MG2 performs regenerative power generation, and enters a power circulation state in which the first rotating electrical machine MG1 is driven by the power. The power circulation state is a state in which the carrier 14 and the engine 1 rotate forward, and the sun gear 11 and the first rotating electrical machine MG1 rotate negatively.

  Accordingly, in the power circulation state, the oil pump 3 is rotationally driven by either the positive rotation of the engine 1 or the negative rotation of the first rotating electrical machine MG1. In other words, the oil pump 3 can always be rotationally driven by either the rotation of the engine 1 or the rotation of the first rotating electrical machine MG1, and the lubricating oil can be appropriately supplied to each part of the power transmission device.

  FIG. 5 is an alignment chart at the time of stationary power generation. At stop power generation, the rotation speed of the ring gear 13 is zero. Since the engine 1 is operated for power generation and is rotating forward, the rotation of the sun gear 11 and the first rotating electrical machine MG1 is forward rotation. The first rotating electrical machine MG1 generates power while rotating forward and generates negative torque.

  At the time of stationary power generation, since the rotation of the first rotating electrical machine MG1 is positive, the rotational speed in the negative direction of the first rotating electrical machine MG1 is zero. Therefore, the first one-way clutch 4 is idled, and the rotation of the engine 1 transmitted via the second one-way clutch 5 rotates the oil pump 3.

  As described above, according to the lubricating device 1-1 of the power transmission device of the present embodiment, the oil pump 3 is rotated by the rotation of the first rotating electrical machine MG1 when the first rotating electrical machine MG1 rotates in the negative direction during EV traveling. Can be rotated, and lubricating oil can be supplied to the lubricated part including the second rotating electrical machine MG2 during EV traveling. Further, the oil pump 3 is appropriately driven to rotate by either the rotation of the engine 1 or the rotation of the first rotating electrical machine MG1 according to the travel mode. Thereby, it is possible to supply lubricating oil with respect to the to-be-lubricated part of a power transmission device with the oil pump 3 irrespective of driving mode. According to the lubricating device 1-1 of the power transmission device of the present embodiment, it is possible to cool and lubricate the second rotating electrical machine MG2 and the like during EV traveling at a lower cost than when an electric oil pump is added.

  The gear ratio γ1 between the pump drive gear 7 and the pump driven gear 8 and the gear ratio γ2 between the drive sprocket 20 and the driven sprocket 21 may be different from each other. When the rotational speed of the pump driven gear 8 is higher than the rotational speed of the driven sprocket 21, the rotation of the first rotating electrical machine MG <b> 1 transmitted through the first one-way clutch 4 rotates the oil pump 3. On the other hand, when the rotational speed of the driven sprocket 21 is higher than the rotational speed of the pump driven gear 8, the rotation of the engine 1 transmitted via the second one-way clutch 5 rotates the oil pump 3. The gear ratio γ1 and the gear ratio γ2 are the loss of the oil pump 3 when power is transmitted through the first one-way clutch 4 and the oil pump 3 when power is transmitted through the second one-way clutch 5, respectively. It may be determined so that the loss can be reduced.

  Here, the pump driven gear 8 is a first rotating element that is disposed coaxially with the pump shaft 9 and connected to the pump shaft 9 via the first one-way clutch 4, and is a negative rotation of the first rotating electrical machine MG <b> 1. Is transmitted to rotate the pump shaft 9 in the direction of rotational driving. The driven sprocket 21 is a second rotating element that is arranged coaxially with the pump shaft 9 and is connected to the rotating shaft 2 via the second one-way clutch 5, and transmits the positive rotation of the engine 1 to the pump. The shaft 9 rotates in the direction of rotational driving. The oil pump 3 is rotationally driven by the rotation of a rotating element that rotates at high speed, either the pump driven gear 8 or the driven sprocket 21.

  Even if the gear ratio γ1 and the gear ratio γ2 are different from each other, the oil pump 3 is rotationally driven by the rotation of the first rotating electrical machine MG1 during EV traveling. Further, at the time of power circulation of HV traveling (see FIG. 4), the oil pump 3 is rotationally driven by the rotation of the engine 1 or the rotation of the first rotating electrical machine MG1 according to the gear ratios γ1 and γ2. By appropriately setting the gear ratios γ1 and γ2 so that the rotation speed of the oil pump 3 is set to an appropriate rotation speed according to the traveling state, loss due to driving the oil pump 3 can be reduced, or an appropriate amount can be obtained. It is possible to supply the lubricating oil to the lubricated part.

[Second Embodiment]
The second embodiment will be described with reference to FIGS. FIG. 6 is a skeleton diagram showing the main part of the hybrid vehicle of the second embodiment. The lubricating device 1-2 of the power transmission device according to the present embodiment is different from the lubricating device 1-1 of the power transmission device of the first embodiment described above in that the lubricating oil is rotationally driven by the rotation of the first rotating electrical machine MG1. The first oil pump 31 that discharges oil and the second oil pump 32 that is rotationally driven by the rotation of the engine 1 and discharges lubricating oil are provided separately.

  As shown in FIG. 6, a first oil pump 31 and a second oil pump 32 are disposed at the end of the rotating shaft 2 of the engine 1 opposite to the engine 1 side. The first oil pump 31 and the second oil pump 32 are disposed adjacent to each other on the same axis.

  FIG. 7 is a cross-sectional view of the vicinity of the oil pump. The first oil pump 31 and the second oil pump 32 face each other in the axial direction across the wall portion of the case 34. The case 34 is a transaxle case that houses the power transmission device. A protrusion 34 a that protrudes in the axial direction toward the engine 1 is formed on the inner wall surface of the case 34. The protruding portion 34 a has a cylindrical shape and is arranged coaxially with the rotating shaft 2 of the engine 1.

  The first oil pump 31 is a trochoid pump, and includes a lid 31a, a drive rotor 31b, a driven rotor 31c, and a pump shaft 31d. The drive rotor 31b and the driven rotor 31c are disposed inside the protruding portion 34a. The protrusion 34 a functions as a pump case for the first oil pump 31. The lid 31a closes the opening of the protrusion 34a so as to seal the drive rotor 31b and the driven rotor 31c with respect to the space outside the protrusion 34a, thereby forming an oil chamber. Drive rotor 31b is connected to rotor shaft 6 of first rotating electrical machine MG1 via pump shaft 31d and one-way clutch 33.

  The one-way clutch 33 transmits the rotation of the first rotating electrical machine MG1 when the first rotating electrical machine MG1 rotates negatively to the pump shaft 31d, and pumps the rotation of the first rotating electrical machine MG1 when the first rotating electrical machine MG1 rotates normally. Transmission to the shaft 31d is restricted. That is, the one-way clutch 33 engages the pump shaft 31d and the rotor shaft 6 to transmit power when the rotor shaft 6 rotates in the negative direction relative to the pump shaft 31d. On the other hand, when the rotor shaft 6 rotates in the positive direction relative to the pump shaft 31d, the one-way clutch 33 disconnects the pump shaft 31d and the rotor shaft 6 and interrupts transmission of power.

  The second oil pump 32 can be a trochoid pump as with the first oil pump 31. The second oil pump 32 includes a pump case 32a, a drive rotor 32b, a driven rotor 32c, and a pump shaft 32d. The pump case 32 a has a cylindrical shape with one end closed, and is fixed so that the opening abuts against the outer wall surface of the case 34. Thereby, the opening part of the pump case 32a is obstruct | occluded by the outer wall surface of the case 34, and an oil chamber is formed inside the pump case 32a. A drive rotor 32b and a driven rotor 32c are disposed in the pump case 32a. The drive rotor 32b is connected to the pump shaft 32d. The pump shaft 32 d is arranged coaxially with the rotation shaft 2 of the engine 1 and is connected to the rotation shaft 2, and rotates integrally with the rotation shaft 2.

  A suction oil passage 35 and a discharge oil passage 36 are formed in the case 34. The suction oil passage 35 is connected to a storage part such as an oil pan for storing lubricating oil. The suction oil passage 35 is connected to the suction port of the first oil pump 31 and the suction port of the second oil pump 32. The first oil pump 31 and the second oil pump 32 suck in lubricating oil through a common suction oil passage 35.

  The discharge oil passage 36 is connected to the discharge port of the first oil pump 31 and the discharge port of the second oil pump 32, respectively. That is, the first oil pump 31 and the second oil pump 32 send out the lubricating oil via the common discharge oil passage 36. The discharge oil passage 36 is connected to the lubricated portion through an oil receiving portion or the like or directly. For example, an oil receiving portion may be provided in the upper portion of the case 34, and the lubricating oil may be supplied to the lubricated portions such as the first rotating electrical machine MG1 and the second rotating electrical machine MG2 through the oil receiving portion.

  The first oil pump 31 is rotationally driven by the negative rotation of the first rotating electrical machine MG1. When the first rotating electrical machine MG1 rotates negatively, the pump shaft 31d and the drive rotor 31b are rotationally driven by the rotation of the first rotating electrical machine MG1. As a result, the drive rotor 31b rotationally drives the driven rotor 31c, so that the lubricating oil is sucked from the suction oil passage 35 to the rotors 31b and 31c and is compressed and discharged to the discharge oil passage 36. .

  The second oil pump 32 is rotationally driven by the rotation of the engine 1. The pump shaft 32d and the drive rotor 32b are rotationally driven by the rotation of the engine 1. As a result, the drive rotor 32b rotationally drives the driven rotor 32c, so that the lubricating oil is sucked from the suction oil passage 35 to the rotors 32b and 32c, and is compressed and discharged to the discharge oil passage 36. .

  FIG. 8 is a conceptual diagram of a lubricating oil supply path in the lubricating device 1-2 of the power transmission device of the present embodiment. The discharge oil passage 36 is branched into a first discharge oil passage 36 a connected to the first oil pump 31 and a second discharge oil passage 36 b connected to the second oil pump 32. A relief valve 37a and a check valve 38a are arranged in the first discharge oil passage 36a, and a relief valve 37b and a check valve 38b are arranged in the second discharge oil passage 36b. In addition, a heat exchanger 39 is disposed on the downstream side of the joining portion between the first discharge oil passage 36a and the second discharge oil passage 36b, that is, on the lubricated portion side.

  The heat exchanger 39 performs heat exchange between the lubricating oil and the heat medium. The lubricating oil discharged from the first oil pump 31 and the second oil pump 32 is supplied to the lubricated part such as the second rotating electrical machine MG2 via the heat exchanger 39. The heat exchanger 39 can cool the lubricating oil by heat exchange between a cooling medium such as cooling water and the lubricating oil. The cooled lubricating oil can lubricate and cool the lubricated part such as the second rotating electrical machine MG2.

  The relief valves 37a and 37b limit the hydraulic pressure of the discharge oil passage 36. The relief valves 37a and 37b are opened when the hydraulic pressure exceeds a predetermined relief pressure, and the lubricating oil in the discharge oil passage 36 is discharged. Thereby, when both the 1st oil pump 31 and the 2nd oil pump 32 become high rotation etc., it suppresses that the hydraulic pressure of the discharge oil path 36 rises too much, and the heat exchanger 39 grade | etc., Is protected.

  The check valves 38a and 38b allow the flow of the lubricating oil from the oil pumps 31 and 32 to the lubricated part, and restrict the flow of the lubricating oil from the lubricated part to the oil pumps 31 and 32. The check valves 38a and 38b are arranged at a position closer to the heat exchanger 39 than the relief valves 37a and 37b, that is, at positions downstream of the relief valves 37a and 37b in the flow direction of the lubricating oil. The check valves 38a and 38b restrict the backflow of the lubricating oil to the oil pumps 31 and 32. Specifically, for example, when the first oil pump 31 is operated and the second oil pump 32 is stopped during EV traveling, or when the vehicle is stopped, the second oil pump 32 is operated and the first oil pump 31 is stopped. In some cases, the backflow of the lubricating oil is restricted when only one of the oil pumps 31 and 32 is operating.

  In the lubricating device 1-2 of the power transmission device of the present embodiment, when the engine 1 rotates, the second oil pump 32 is rotationally driven by the rotation of the engine 1 and discharges the lubricating oil. Further, when the first rotating electrical machine MG1 rotates negatively, the first oil pump 31 is driven to rotate by the rotation of the first rotating electrical machine MG1 to discharge the lubricating oil. Therefore, during EV travel (see FIG. 2), the first oil pump 31 is rotationally driven to supply lubricating oil to the lubricated part, and the second oil pump 32 stops. Further, at the time of power splitting in HV traveling (see FIG. 3), the second oil pump 32 is rotationally driven to supply lubricating oil to the lubricated portion, and the first oil pump 31 stops. At the time of power circulation in HV traveling (see FIG. 4), the first oil pump 31 and the second oil pump 32 are driven to rotate and supply lubricating oil to the lubricated part. During stoppage power generation, the second oil pump 32 is rotationally driven to supply lubricating oil to the lubricated portion, and the first oil pump 31 stops. In this way, it becomes possible to supply lubricating oil to the lubricated part not only during HV traveling or during stationary power generation but also during EV traveling, and the lack of lubrication and cooling in the second rotating electrical machine MG2 and the like can be suppressed. Can do.

[Other examples]
Note that, as will be described with reference to FIGS. 9 and 10, when the ring gear 13 is supported at both ends, the oil pump may be disposed radially inward of the ring gear 13. FIG. 9 is a diagram showing a lubrication device 1-3 of a power transmission device having an oil pump arranged radially inward of the ring gear, and FIG. 10 shows a main part of the lubrication device 1-3 of the power transmission device. It is sectional drawing. FIG. 10 shows an AA cross section of FIG.

  The ring gear 13 is disposed on the inner peripheral surface of the rotating body 16. The rotating body 16 has a hollow cylindrical shape and is arranged coaxially with the rotating shaft 2. The counter drive gear 15 is disposed on the outer peripheral surface of the rotating body 16. That is, the ring gear 13, the rotating body 16, and the counter drive gear 15 constitute a composite gear that rotates integrally, and the oil pump 40 is disposed inside the composite gear. Both ends of the rotator 16 are supported by the case 34 via bearings 18 and 19, respectively. The bearing 18 supports the engine 1 side in the axial direction relative to the ring gear 13 in the rotating body 16. On the other hand, the bearing 19 supports the side opposite to the engine 1 side in the axial direction from the ring gear 13 in the rotating body 16.

  The case 34 has a protrusion 34b into which the rotation shaft 2 is inserted. The protrusion 34 b has a cylindrical shape and protrudes toward the inside of the case 34. In other words, the protruding portion 34b protrudes toward the side opposite to the engine 1 side in the axial direction. The protrusion 34 b has an inner peripheral surface that supports the rotary shaft 2 via a bearing, and an outer peripheral surface that supports the rotating body 16 via a bearing 18. The oil pump 40 is disposed in a recess formed at the tip of the protrusion 34b. The drive rotor 40b and the driven rotor 40c are disposed in the recess, and the opening of the recess is closed by the lid 40a. The pump shaft 40d connected to the drive rotor 40b extends in the axial direction from the drive rotor 40b toward the side opposite to the engine 1 in the axial direction. The discharge oil passage 36 is formed in the case 34. Lubricating oil discharged from the oil pump 40 is guided to a lubricated portion such as the first rotating electrical machine MG1, the second rotating electrical machine MG2, the planetary gear mechanism 10 and the like via the discharge oil passage 36.

  The oil pump 40 is connected to the ring gear 13 via the first one-way clutch 41 and is connected to the rotary shaft 2 via the second one-way clutch 42. Specifically, the ring member 17 is disposed on the radially outer side of the pump shaft 40d. The ring member 17 has an annular shape and is fitted to the inner peripheral surface of the rotating body 16. As shown in FIG. 10, a sprag 41a is disposed between the inner peripheral surface of the ring member 17 and the outer peripheral surface of the pump shaft 40d. The first one-way clutch 41 has the ring member 17 as an outer ring and the pump shaft 40d as an inner ring. When the ring member 17 rotates relative to the pump shaft 40d in the forward direction, the sprag 41a meshes with and engages with the pump shaft 40d and the ring member 17, respectively. On the other hand, when the ring member 17 rotates relative to the pump shaft 40d in the negative direction, the sprag 41a releases the engagement between the pump shaft 40d and the ring member 17 and interrupts the transmission of torque.

  A sprag 42 a is disposed between the inner peripheral surface of the pump shaft 40 d and the outer peripheral surface of the rotary shaft 2. The second one-way clutch 42 has the pump shaft 40d as an outer ring and the rotating shaft 2 as an inner ring. The sprag 42a meshes with and engages with the pump shaft 40d and the rotary shaft 2 when the rotary shaft 2 rotates relative to the pump shaft 40d in the positive direction. On the other hand, when the rotary shaft 2 rotates in the negative direction relative to the pump shaft 40d, the sprag 42a releases the engagement between the pump shaft 40d and the rotary shaft 2 and blocks torque transmission.

  Accordingly, in the lubricating device 1-3 of the power transmission device, either the rotation of the rotating shaft 2 or the rotation of the ring gear 13 is transmitted to the pump shaft 40d to rotate the oil pump 40. When the rotation of the ring gear 13 is faster than the rotation of the rotary shaft 2, the rotation of the ring gear 13 rotates the oil pump 40 via the first one-way clutch 41. On the other hand, when the rotation of the rotating shaft 2 is faster than the rotation of the ring gear 13, the rotation of the rotating shaft 2 rotationally drives the oil pump 40 via the second one-way clutch 42. As a result, the oil pump 40 is rotated and supplied to the lubricated part not only at the time of HV traveling or at the time of stopping power generation but also at the time of EV traveling.

  Further, in the lubrication device 1-3 of the power transmission device, the oil pump 40, the first one-way clutch 41, and the second one-way clutch 42 are disposed inside the rotating body 16, and are disposed between the bearing 18 and the bearing 19. Has been. Thereby, even if it is a power transmission device in which the ring gear 13 of the planetary gear mechanism 10 is supported at both ends, a lubrication device that rotationally drives the oil pump 40 by the rotation of either the ring gear 13 or the engine 1 can be realized. It becomes. If the hybrid vehicle 100 is running or the engine 1 is rotating, the oil pump 40 is driven and the lubricating oil is discharged, so that the lubricated part can be appropriately lubricated and cooled.

  The contents disclosed in the above embodiments can be executed in appropriate combination.

1-1, 1-2, 1-3 Lubricating device for power transmission device 1 Engine 3 Oil pump 4 First one-way clutch (one-way clutch)
5 Second one-way clutch 10 Planetary gear mechanism 11 Sun gear 12 Pinion gear 13 Ring gear 14 Carrier 29 Drive wheel

Claims (3)

A planetary gear mechanism,
An oil pump that is driven to rotate and discharges lubricating oil;
The first one-way clutch ,
With a second one-way clutch ,
The sun gear of the planetary gear mechanism is connected to the first rotating electrical machine, the carrier is connected to the engine, the ring gear is connected to the drive wheel and the second rotating electrical machine,
The oil pump is connected to the first rotating electrical machine via the first one-way clutch,
The first one-way clutch transmits the rotation of the first rotating electric machine when the first rotating electric machine rotates in a negative direction, with the rotation direction of the ring gear during forward traveling of the hybrid vehicle as a positive direction. Rotate the oil pump ,
The second one-way clutch connects the engine and the oil pump, and transmits the rotation of the engine to the oil pump when the engine rotates in the forward direction.
When the negative rotating speed of the first rotating electric machine is higher than the rotating speed of the engine in the positive direction, the rotation of the first rotating electric machine transmitted through the first one-way clutch causes the oil pump to rotate. Rotation drive
When the rotation speed in the positive direction of the engine is higher than the rotation speed in the negative direction of the first rotating electrical machine, the rotation of the engine transmitted through the second one-way clutch rotates the oil pump. A lubrication device for a power transmission device. The lubricating device for a power transmission device according to claim 1, further comprising a second oil pump connected to the engine and driven to rotate by rotation of the engine to discharge lubricating oil. The lubricating device for a power transmission device according to claim 2 , wherein the oil pump and the second oil pump are coaxially adjacent to each other.

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