JP2008279826A - Driving device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device for a vehicle capable of preventing seizing, due to lack of oil supply and reducing stirring resistance of components due to excessive supply of oil for preventing deterioration in fuel consumption. <P>SOLUTION: The driving device for a vehicle is provided with an engine 2, oil passages 65, 67, 69, and 70 for supplying oil to a plurality of components transmitting torque from a first motor generator 6 and a second motor generator 9 to left and right driving wheels 41 and 42, an oil pump 66; an oil cooler 68, oil passages 72, 73, 75, 76, 77, 79, 80, and 82 diverted from the oil passage 69 for supplying oil to at least one component among the plurality of components; valves 74, 78, and 81 opening/closing the oil passages 73, 77, and 80; and a computing unit 61 control the valves 74, 78, and 81 for supplying oil to components satisfying a seizing occurrence condition. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle drive device, and more particularly to a vehicle drive device that supplies lubricating oil to each component that transmits torque from a power source to left and right drive wheels.

  As a conventional vehicle drive device of this type, the drive gear of the transfer is rotatably supported on the outer peripheral surface of the input shaft, and the front differential gear of the differential gear device is formed integrally with the drive gear. It is known that a through shaft is connected to the rear inter-difference gear and the through shaft is disposed so as to cross the axle housing (for example, see Patent Document 1).

  In this vehicle drive device, when the input shaft is driven, the impellers of the drive gear and the rear inter-diff gear rotate, and the impeller functions as a pump, and the vicinity of the impeller and the contact surface between the drive gear and the input shaft Oil is supplied to the contact surface between the drive gear and the input shaft through an oil passage between the drive gear and the input shaft.

Further, in a vehicle drive device mounted on a hybrid vehicle, in order to lower the center of gravity, it is desired that the position of a main shaft on which a motor generator, a planetary gear device, and the like rotate is arranged at a lower position than before. .
JP-A-6-147302

  However, in the conventional vehicle drive device described in Patent Document 1 as described above, oil is always supplied, so even when there is no need for lubrication, impellers and There is a problem that a loss torque due to oil agitation resistance is generated on the contact surface between the drive gear and the input shaft, resulting in deterioration of fuel consumption.

  In addition, in the FF (front engine front drive; front wheel drive in front of the engine) type vehicle drive system mounted on a hybrid vehicle, a large amount of oil is provided so that the differential is well lubricated when the main shaft is arranged at a low position. If this is installed, the oil level in the main shaft will rise, and each rotating object on the main shaft, such as a motor generator, will be immersed in oil, increasing the stirring resistance of the rotating part, resulting in a deterioration in fuel consumption. was there.

  In order to eliminate such problems, in order to reduce the oil level and reduce the stirring resistance of the rotating part, after the oil in the oil pan is discharged by the oil pump so that the oil level of the oil pan is lowered, the oil It is conceivable to circulate the oil so that it is cooled by a cooler and returned to the oil pan.

  However, when the oil level of the oil pan is set to a low level in this way, there arises a problem that seizure occurs due to insufficient lubrication of the differential.

  The present invention has been made to solve the above-described conventional problems, and can prevent seizure due to insufficient oil supply and reduce the agitation resistance of components due to excessive oil supply, thereby reducing fuel consumption. An object of the present invention is to provide a vehicle drive device that can prevent deterioration of the vehicle.

  In order to achieve the above object, a vehicle drive device according to the present invention includes (1) a plurality of components that transmit torque from a power source to left and right drive wheels, and a first supply that supplies lubricating oil to the components. And at least one second supply pipe branched from the first supply pipe so as to supply lubricating oil to at least one of the plurality of constituent elements, and Whether opening / closing means provided on the second supply pipe so as to open and close the second supply pipe and a seizure occurrence condition of a component to which lubricating oil is supplied from the second supply pipe are satisfied A burn-in condition determining means for determining whether or not the burn-in condition determining means determines that the burn-in occurrence condition is satisfied, and a control means for controlling the opening and closing means to supply lubricating oil to the constituent elements. It is.

  With this configuration, a part of the lubricating oil supplied to each component from the first supply pipe is supplied to the component that may be seized by the second supply pipe, so that the oil level is low. However, by preferentially supplying oil to areas where there is a risk of seizure, seizure due to insufficient oil supply can be prevented, and fuel consumption can be reduced by reducing the stirring resistance of components due to excessive oil supply. Can be prevented.

  The vehicle drive device according to the present invention is the vehicle drive device according to (1), wherein (2) the plurality of constituent elements combine an electric motor, torque from an internal combustion engine, and torque from the electric motor. A torque synthesizing unit and a differential device for rotating the left and right driving wheels by the synthesized torque synthesized by the torque synthesizing unit, and measuring the number of rotations of the left and right driving wheels, Differential rotation speed calculation means for calculating a differential rotation speed of the differential device; and torque calculation means for calculating a combined torque of the required torque instructed to the internal combustion engine and the required torque instructed to the electric motor. The burn-in condition determination unit is configured to determine the difference based on at least one of the differential rotation number calculated by the differential rotation number calculation unit and the combined torque calculated by the torque calculation unit. And a one to determine whether or not to satisfy the equipment seizure occurrence condition.

  With this configuration, it is determined whether or not the seizure occurrence condition of the differential device is satisfied based on at least one of the differential rotation speed and the combined torque, and the lubricant is supplied to the differential device. By preferentially supplying oil to a certain place, seizure due to insufficient oil supply and deterioration of fuel consumption due to excessive oil supply can be prevented. Further, by controlling the required torque so as not to satisfy the burn-in occurrence condition of the differential device, it is possible to prevent the differential device from being burned-in.

  The vehicle drive device according to the present invention is the vehicle drive device according to (2), wherein (3) a case housing the electric motor, the torque synthesizing means, and the differential device, and a bottom portion of the case Lubricating oil temperature detecting means for detecting the temperature of the lubricating oil stored in the engine, and the burn-in condition determining means comprises the differential rotational speed calculated by the differential rotational speed calculating means and the composition calculated by the torque calculating means. Based on at least one of the torques and the temperature of the lubricating oil detected by the lubricating oil temperature detecting means, the differential device determines whether or not the seizure occurrence condition is satisfied.

  With this configuration, whether or not the seizure occurrence condition is satisfied can be accurately determined based on the temperature of the lubricating oil in addition to at least one of the differential rotation speed and the combined torque. By preferentially supplying oil to a certain place, seizure due to insufficient oil supply and deterioration of fuel consumption due to excessive oil supply can be prevented. In addition, the differential rotation speed or the combined torque is accurately controlled with reference to the temperature of the lubricating oil so as not to satisfy the seizure occurrence condition of the differential apparatus, thereby reliably preventing the occurrence of seizure of the differential apparatus. be able to.

  The vehicle drive device according to the present invention is the vehicle drive device according to (2) or (3), wherein (4) the differential device includes a diff ring gear to which the combined torque is input; A differential case that rotates together with a differential ring gear, a pinion gear that is accommodated in the differential case, and a side gear that is accommodated in the differential case and meshes with the pinion gear and is connected to a drive shaft. It has a drive shaft fitting part with which a shaft is fitted, and is configured to be supplied with lubricating oil through the second supply pipe to the drive shaft fitting part.

  With this configuration, when the drive shaft fitting part satisfies the seizure occurrence condition, lubricating oil is supplied to the drive shaft fitting part. It is possible to prevent seizure due to insufficient oil supply and fuel consumption deterioration due to excessive oil supply.

  The vehicle drive device according to the present invention is the vehicle drive device according to (2) or (3), wherein (5) the differential device includes a differential ring gear to which the combined torque is input; A differential case that rotates together with a differential ring gear, a pinion gear that is pivotally supported in the differential case, and a side gear that is pivotally supported in the differential case and meshes with the pinion gear and has a drive shaft coupled thereto. It has a pinion gear fitting portion into which the pinion gear is fitted, and is configured such that lubricating oil is supplied to the pinion gear fitting portion through the second supply pipe.

  With this configuration, when the pinion gear fitting portion satisfies the seizure occurrence condition, the lubricating oil is supplied to the pinion gear fitting portion. It is possible to prevent seizure due to insufficient supply of oil and deterioration of fuel consumption due to excessive supply of oil.

  According to the present invention, there is provided a vehicle drive device that can prevent seizure due to an insufficient supply of oil and reduce agitation resistance of components due to an excessive supply of oil and prevent deterioration of fuel consumption. be able to.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a skeleton diagram of a hybrid vehicle of the FF (front engine front drive; engine front front wheel drive) type equipped with a vehicle drive device according to an embodiment of the present invention.

  First, the configuration will be described.

  As shown in FIG. 1, the power train 11 of the hybrid vehicle 1 includes an engine 2 as a power source, a vehicle drive device 28, drive shafts 39 and 40, and drive wheels 41 and 42. The second crankshaft 2 a is disposed horizontally in the width direction of the hybrid vehicle 1.

  A flywheel 3 is formed at the end of the crankshaft 2a. A vehicle drive device 28 as a transaxle having a single transmission mechanism, power distribution mechanism, and differential mechanism is attached to the outer wall of the engine 2, and a case 4 that is a casing of the vehicle drive device 28. Is manufactured by a die casting method using a metal material such as aluminum, and has a hollow structure. In the internal space 4i of the case 4, an input shaft 5, a first motor generator 6, a power distribution mechanism 7, a transmission mechanism 8, a second motor generator 9, and the like are provided. The input shaft 5 rotates about the axis A1, and the clutch hub 10 is spline-fitted to the end on the crankshaft 2a side.

  A damper mechanism 12 that suppresses and absorbs torque fluctuation is provided between the flywheel 3 and the input shaft 5. 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 2 than the first motor generator 6. That is, the first motor generator 6 is disposed between the engine 2 and the second motor generator 9.

  The first motor generator 6 and the second motor generator 9 have a function as an electric motor that is driven as a power source by supplying electric power, that is, a power running function, and a function as a generator that converts mechanical energy into electric energy, that is, regeneration. It combines functions. The first motor generator 6 has a stator 13 fixed to the case 4 and a rotatable rotor 14.

  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 configured to be relatively rotatable. On the inner surface of the case 4, partition walls 4a, 4b, and 4c are provided. A bearing 15 is attached to the partition wall 4a, and a bearing 16 is attached to the partition wall 4b, and the hollow shaft 17 is rotatably held by the bearings 15 and 16.

  A power distribution mechanism 7 is provided between the first motor generator 6 and the second motor generator 9. The power distribution mechanism 7 includes a so-called single pinion type planetary gear unit 7a. That is, the planetary gear unit 7 a includes a sun gear 18, a ring gear 19 disposed concentrically with the sun gear 18, a plurality of pinion gears 20 that mesh with the sun gear 18 and the ring gear 19, and a carrier 21 that holds the pinion gear 20. is doing. The sun gear 18 is connected to the hollow shaft 17, and the carrier 21 is connected to the input shaft 5. The ring gear 19 is formed on the inner peripheral side of an annular member 22 arranged concentrically with the input shaft 5, and the outer peripheral portion of the annular member 22 is a component that rotates about the axis A1 of the main shaft. A counter drive gear 23 is formed. The counter drive gear 23 includes a counter driven gear 37 that is a component that rotates about the axis A2 of the second axis, a differential 38 that is a component that rotates about the axis A3 of the third axis, a drive It is connected to drive wheels 41 and 42 via shafts 39 and 40.

  A right wheel rotational speed sensor 62 that measures the rotational speed of the driving wheel 41 is provided in the vicinity of the right driving wheel 41, and a left wheel that measures the rotational speed of the driving wheel 42 in the vicinity of the left driving wheel 42. A rotation speed sensor 63 is provided. The rotational speeds measured by the right wheel rotational speed sensor 62 and the left wheel rotational speed sensor 63 are sent to the arithmetic unit 61. The right wheel rotational speed sensor 62 and the left wheel rotational speed sensor 63 detect the rotation of the driving wheels 41 and 42 magnetically or optically so that a pulse is generated each time the driving wheels 41 and 42 make one rotation. It is configured. The arithmetic unit 61 is configured as a microprocessor centered on a CPU (not shown), and controls oil lubrication in the case 4 as will be described later.

  A connecting shaft 5a is concentrically connected to the input shaft 5, and the input shaft 5 and the connecting shaft 5a can rotate integrally. A hollow shaft 24 is rotatably attached to the outer peripheral portion of the connecting shaft 5 a, and the second motor generator 9 is disposed on the outer peripheral portion of the hollow shaft 24. The second motor generator 9 has a stator 25 fixed to the case 4 and a rotatable rotor 26, and the rotor 26 is connected to the hollow shaft 24 so as to rotate integrally. A bearing 35 is attached to the partition wall 4 c on the inner surface of the case 4, and a bearing 36 is attached to an end of the case 4, and the hollow shaft 24 is rotatably held by the bearings 35 and 36.

  A speed change mechanism 8 is provided between the power distribution mechanism 7 and the second motor generator 9. The transmission mechanism 8 includes a so-called single pinion type planetary gear unit 8a. That is, the planetary gear device 8 a includes a sun gear 29 that rotates integrally with the hollow shaft 24, a ring gear 30 that is disposed concentrically with the sun gear 29 and formed on the inner periphery of the annular member 22, and the sun gear 29 and the ring gear. A plurality of pinion gears 31 that mesh with 30 and a carrier 32 that holds the pinion gears 31 are provided. The carrier 32 is fixed to the partition wall 4c so as not to rotate. The annular member 22 is rotatably held by a bearing 33 attached to the partition wall 4b and a bearing 34 attached to the partition wall 4c.

  In the power train 11, torque output from the engine 2 is transmitted to the carrier 21 via the input shaft 5. The torque transmitted to the carrier 21 is transmitted to the drive wheels 41 and 42 via the ring gear 19, the annular member 22, the counter drive gear 23, and the like. Further, when the torque of the engine 2 is transmitted to the carrier 21, the first motor generator 6 can function as a generator, and the generated power can be charged in a power storage device (not shown).

  In the power train 11, the second motor generator 9 can be driven as an electric motor, and the power can be transmitted to the power distribution mechanism 7. When the power of the second motor generator 9 is transmitted to the sun gear 29 via the hollow shaft 24, the carrier 32 is fixed to the partition wall 4c as described above and acts as a reaction force element, so that each pinion gear 31 is It rotates without revolving, and the torque of each pinion gear 31 is transmitted to the ring gear 30. The rotational speed of the ring gear 30 is reduced with respect to the rotational speed of the sun gear 29, and the rotational direction of the ring gear 30 is opposite to the rotational direction of the sun gear 29.

  The power of the engine 2, the first motor generator 6, and the second motor generator 9 is input to the power distribution mechanism 7 and combined, and the combined power is transmitted to the drive wheels 41 and 42. Therefore, the hybrid vehicle 1 having the power train 11 can transmit the torque of at least one of the engine 2 and the first motor generator 6 and the second motor generator 9 to the drive wheels 41 and 42. The power distribution mechanism 7 constitutes torque combining means in the present invention.

  FIG. 2 is a cross-sectional view showing a horizontal cross section of the vehicle drive device according to the embodiment of the present invention.

  As shown in FIG. 2, a portion of the case 4 of the vehicle drive device 28 in which the differential 38 is accommodated protrudes from a portion that accommodates components that rotate about the axis A <b> 1 of the main shaft. Forming. The differential storage portion 4 d stores a differential ring gear 43 and a differential case 51 that rotates together with the differential ring gear 43. The differential case 51 houses a pinion shaft 52, a pinion gear 53, and a side gear 54. The pinion shaft 52 is fixed to the differential case 51, and rotatably supports the pinion gear 53. The pinion gear 53 meshes with the two side gears 54 spline-coupled to the left and right drive shafts 39 and 40, and when there is a difference in the rotation of the two side gears 54, the pinion shaft 52 rotates around the pinion shaft 52.

  The differential case 51 has a drive shaft fitting portion 55 into which the drive shafts 39 and 40 are fitted. The drive shaft fitting portion 55 of the differential case 51 is provided with a groove 51a serving as an oil passage, and an oil film is formed between the drive shaft fitting portion 55 and the drive shafts 39 and 40. Yes.

  The pinion gear 53 has a pinion gear fitting portion 56 that comes into contact with the pinion shaft 52, and an oil film is formed between the pinion shaft 52 and the pinion gear fitting portion 56 by the oil in the differential case 51. Yes.

  Supply ports 57, 58, and 85 for supplying oil stored at the bottom of the case 4 into the differential storage portion 4 d through the outside of the case 4 are formed on the upper surface of the differential storage portion 4 d of the case 4. . The supply port 57 is for supplying oil to the drive shaft fitting portion 55, and is disposed, for example, above the boundary portion between the differential case 51 and the drive shafts 39 and 40. The supply port 58 supplies oil to the pinion gear fitting portion 56 and is disposed above the pinion shaft 52. The supply port 85 supplies oil to an end portion in the differential storage portion 4d, that is, an end portion in the differential storage portion 4d farthest from the component rotating around the axis A1 of the main shaft. Arranged at the end in the portion 4d.

  Further, the upper part in the case 4 is a component that rotates the oil stored in the bottom part in the case 4 around the axis A1 of the main shaft and the axis A2 of the second axis. An oil catch tank 71 (see FIG. 3) for supplying the counter driven gear 37 mainly to each part in the case 4 is provided. The oil catch tank 71 is disposed above the power distribution mechanism 7, the transmission mechanism 8, and the counter driven gear 37.

  FIG. 3 is a cross-sectional view of the vehicle drive device according to the embodiment of the present invention, taken along arrow AA in FIG. 2, and shows a lubrication system of the vehicle drive device.

  As shown in FIG. 3, oil passages 65, 67, 69, and 70 are provided outside the case 4 to supply oil stored in the bottom of the case 4 to the oil catch tank 71. An oil pump 66 is provided between the oil passage 65 and the oil passage 67 to drive the engine 2 or a separately provided motor (not shown) as a power source. The oil is pumped through the oil passages 65, 67, 69, and 70. It has come to be. Between the oil passage 67 and the oil passage 69, an oil cooler 68 is provided as a heat exchanger disposed so as to be exposed to the outside air, and the oil that has passed through the oil cooler 68 is cooled. It has become. The oil passages 65, 67, 69, and 70, the oil pump 66, and the oil cooler 68 constitute a first supply pipe in the present invention. The oil that has entered the oil catch tank 71 drops downward and lubricates each component housed in the case 4. Further, the oil stored in the bottom of the case 4 is lifted up by the rotation of the diff ring gear 43, the counter driven gear 37, and the counter drive gear 23 to lubricate each component housed in the case 4.

  Outside the case 4, oil passages 72, 73, and 75 that supply oil stored in the bottom of the case 4 to the supply port 58 are provided. The oil passage 72 is branched from the oil passage 69, and a valve 74 that is opened and closed by an actuator 74 a is provided between the oil passage 73 and the oil passage 75.

  Outside the case 4, oil passages 76, 77, and 79 that supply oil stored in the bottom of the case 4 to the supply port 57 are provided. The oil passage 76 is branched from the oil passage 72, and a valve 78 that is opened and closed by an actuator 78 a is provided between the oil passage 77 and the oil passage 79.

  Outside the case 4, oil passages 80 and 82 that supply oil stored in the bottom of the case 4 to the supply port 85 are provided. The oil passage 80 is branched from the oil passage 76, and a valve 81 that is opened and closed by an actuator 81a is provided between the oil passage 80 and the oil passage 82. The oil passages 72, 73, 75, 76, 77, 79, 80, and 82 constitute a second supply pipe in the present invention. Further, the valves 74, 78, 81 constitute the opening / closing means in the present invention. The oil passages 65, 67, 69, 70, 72, 73, 75, 76, 77, 79, 80, 82, the oil pump 66 and the valves 74, 78, 81 may be provided inside the case 4. Good.

  A partition plate 4e is provided on the side of the axis A1 in the differential housing portion 4d of the case 4 to limit the oil agitated by the diff ring gear 43, thereby reducing the agitation resistance when the diff ring gear 43 agitates the oil. It is supposed to be.

  The actuators 74a, 78a, 81a are constituted by electromagnetic solenoids or the like, and are controlled by the arithmetic unit 61 to open or close the valves 74, 78, 81, respectively. The actuators 74a, 78a, and 81a close the valves 74, 78, and 81, respectively, when the hybrid vehicle 1 is in a normal traveling state and there is no risk of seizing the components in the differential housing portion 4d. Thus, the valves 74, 78, and 81 are opened in response to a command from the arithmetic unit 61 when there is a risk of burning the components in the differential housing portion 4d.

  An oil temperature gauge 64 as a lubricating oil temperature detecting means for detecting the temperature of oil stored in the case 4 is provided at the bottom of the case 4, and the oil temperature detected by the oil temperature gauge 64 is an arithmetic unit. 61 is sent.

  The arithmetic unit 61 is configured to receive an engine required torque that the vehicle computer 86 instructs to an engine ECU (Electronic Control Unit) 87 and a motor generator required torque that the vehicle computer 86 instructs to the motor generator ECU 88. The vehicle computer 86 is configured as a microprocessor centered on a CPU (not shown), and performs overall control of each part of the hybrid vehicle 1. The engine ECU 87 is configured as a microprocessor centered on a CPU (not shown), and electrically controls the engine 2. The motor generator ECU 88 is configured as a microprocessor centered on a CPU (not shown), and electrically controls the first motor generator 6 and the second motor generator 9. Here, the engine required torque and the motor generator required torque are signals instructed by the vehicle computer 86 to be generated by the engine 2, the first motor generator 6 and the second motor generator 9, respectively. The arithmetic unit 61 calculates a combined torque of the engine required torque and the motor generator required torque. The arithmetic unit 61 constitutes torque calculation means in the present invention. The combined torque calculated by the arithmetic unit 61 is actually output from the engine 2, the first motor generator 6, and the second motor generator 9, combined by the power distribution mechanism 7, and input to the diff ring gear 43 of the differential 38. Is treated as being equal to the differential shaft torque.

  The arithmetic unit 61 calculates the differential of the differential 38 based on the rotation speed of the right drive wheel 41 input from the right wheel rotation speed sensor 62 and the rotation speed of the left drive wheel 42 input from the left wheel rotation speed sensor 63. The rotational speed (hereinafter referred to as differential shaft operating rotational speed) is calculated. Here, the value of the differential shaft differential rotational speed is the difference between the rotational speed input from the right wheel rotational speed sensor 62 and the rotational speed input from the left wheel rotational speed sensor 63. The arithmetic unit 61 constitutes a differential rotation speed calculation means in the present invention.

  The arithmetic unit 61 controls the driving of the actuators 74a, 78a, 81a based on the oil temperature measured by the oil temperature gauge 64, the calculated combined torque, and the differential shaft differential rotation speed, and controls the valves 74, 78, 81. Each opens and closes. The arithmetic unit 61 constitutes an opening / closing control means in the present invention. Further, the arithmetic unit 61 burns in the drive shaft fitting portion 55 and the pinion gear fitting portion 56 based on at least one of the calculated differential shaft differential rotation speed or the combined torque and the oil temperature detected by the oil temperature gauge 64. It is determined whether or not the generation condition is satisfied. The arithmetic unit 61 constitutes a burn-in condition determination means in the present invention.

  FIG. 4 is a flowchart showing the drive shaft fitting portion burn-in determination operation of the vehicle drive device according to the embodiment of the present invention.

  As shown in FIG. 4, the arithmetic unit 61 first obtains the engine required torque instructed from the vehicle computer 86 to the engine ECU 87, the motor generator required torque instructed from the vehicle computer 86 to the motor generator ECU 88, and the right wheel. The rotational speeds of the drive wheels 41 and 42 are acquired from the rotational speed sensor 62 and the left wheel rotational speed sensor 63, respectively (step S1).

  Next, the arithmetic unit 61 calculates a differential shaft torque Td, which is a combined torque, from the engine required torque and the motor generator required torque, and the driving wheel acquired from the right wheel rotational speed sensor 62 and the left wheel rotational speed sensor 63. The differential shaft differential rotation speed Nd, which is the difference between the rotation speeds 41 and 42, is calculated (step S2).

  Next, the arithmetic unit 61 determines whether or not the drive shaft fitting portion 55 satisfies the burn-in occurrence condition based on the differential shaft torque Td, the differential shaft differential rotation speed Nd, and the oil temperature (step S3). Specifically, the arithmetic unit 61 determines that the relationship between the differential shaft torque Td and the threshold value TdNG that varies according to the oil temperature satisfies Td> TdNG, and the differential shaft differential rotation speed Nd and the oil temperature. When the relationship with the fluctuating threshold value NdNG satisfies Nd> NdNG, it is determined that the drive shaft fitting portion 55 satisfies the burn-in occurrence condition.

  Next, when the arithmetic unit 61 determines in step S3 that the drive shaft fitting portion 55 satisfies the burn-in occurrence condition, the arithmetic unit 61 controls the actuator 78a to open the valve 78 and engage the drive shaft from the supply port 57. The oil is preferentially returned to the unit 55 (step S4).

  On the other hand, if it is determined in step S3 that the drive shaft fitting portion 55 does not satisfy the burn-in occurrence condition, the arithmetic unit 61 keeps the valve 78 to the drive shaft fitting portion 55 closed and performs the oil operation as usual. The oil is returned to the catch tank 71 (step S5). The flow rate ratio between the oil supplied to the oil catch tank 71 and the oil supplied to the supply port 57 when the valve 78 is opened is preferably about 9: 1, for example. It is not limited to this flow rate ratio, and may be about 8: 2 or 7: 3.

  FIG. 5 is a flowchart showing the pinion gear fitting portion burn-in determination operation of the vehicle drive device according to the embodiment of the present invention.

  As shown in FIG. 5, the arithmetic unit 61 first acquires the rotation speeds of the drive wheels 41 and 42 from the right wheel rotation speed sensor 62 and the left wheel rotation speed sensor 63, respectively (step S11).

  Next, the arithmetic unit 61 calculates a differential shaft differential rotation speed Nd that is a difference between the rotation speeds of the drive wheels 41 and 42 acquired from the right wheel rotation speed sensor 62 and the left wheel rotation speed sensor 63 (step S12).

  Next, the arithmetic unit 61 determines whether or not the pinion gear fitting portion 56 satisfies the burn-in occurrence condition based on the differential shaft differential rotation speed Nd and the oil temperature (step S13). Specifically, in the arithmetic unit 61, when the relationship between the differential shaft differential rotation speed Nd and the threshold value NdNG that varies according to the oil temperature satisfies Nd> NdNG, the pinion gear fitting portion 56 satisfies the seizure occurrence condition. It is determined that

  Next, when the arithmetic unit 61 determines in step S13 that the pinion gear fitting portion 56 has satisfied the burn-in occurrence condition, the arithmetic unit 61 controls the actuator 74a to open the valve 74 and open the pinion gear fitting portion 56 from the supply port 58. The oil is preferentially returned to (Step S14).

  On the other hand, if it is determined in step S13 that the pinion gear fitting portion 56 does not satisfy the seizure occurrence condition, the arithmetic unit 61 keeps the valve 74 to the pinion gear fitting portion 56 closed and keeps the oil catch tank as usual. The oil is returned to 71 (step S15). The flow rate ratio between the oil supplied to the oil catch tank 71 and the oil supplied to the supply port 58 when the valve 74 is opened is preferably about 9: 1, for example. It is not limited to this flow rate ratio, and may be about 8: 2 or 7: 3.

  FIG. 6 is a burn-in determination graph used in the drive shaft fitting portion burn-in determination operation and the pinion gear fitting portion burn-in determination operation of the vehicle drive device according to the embodiment of the present invention.

  As shown in FIG. 6, the thresholds TdNG and NdNG used to determine whether the drive shaft fitting portion 55 or the pinion gear fitting portion 56 satisfies the burn-in occurrence condition are the differential shaft torque Td and the differential shaft differential rotational speed. The intersection point of Nd is determined depending on whether it is located on the seizing area D side or on the safety area S side with respect to the seizing limit lines L1 and L2 determined according to the oil temperature t. In FIG. 6, the vertical axis represents the differential shaft torque Td, and the horizontal axis represents the differential shaft differential rotation speed Nd. Here, if the oil temperature t1> the oil temperature t2, the seizure limit line L1 at the oil temperature t1 is located on the upper right side than the seizure limit line L2 at the oil temperature t2, and the oil temperature t1 is more The safe area S becomes wider and the seizing area D becomes narrower than when the oil temperature t2. That is, when the oil temperature is high, the oil level in the case 4 is increased due to the expansion of the oil, and the lubricity is improved, so that seizure hardly occurs. Note that whether or not the pinion gear fitting portion 56 satisfies the seizure occurrence condition is determined using only the threshold value NdNG determined according to the oil temperature.

  Next, the operation will be described.

  In a normal driving state such as when the hybrid vehicle 1 is traveling straight ahead with a low load, the differential 38 is not differential. Therefore, the two side gears 54 of the differential 38 rotate at the same rotational speed and drive. Friction does not occur in the shaft fitting portion 55 and the pinion gear fitting portion 56. For this reason, the differential shaft torque Td calculated from the engine required torque and the motor generator required torque is lower than the threshold value Nd. Further, the differential shaft differential rotation speed Nd is lower than the threshold value NdNG. Therefore, the arithmetic unit 61 keeps the valves 74, 78, 81 closed, and the oil is supplied only to the oil catch tank 71.

  On the other hand, when the hybrid vehicle 1 is not in a normal traveling state, the differential shaft torque Td calculated from the engine required torque and the motor generator required torque may be higher than the threshold value Nd. Also, the differential shaft differential rotation speed Nd may be higher than the threshold value NdNG. Therefore, when the differential shaft torque Td is higher than the threshold value Nd and the differential shaft differential rotation speed Nd is higher than the threshold value NdNG, the arithmetic unit 61 opens the valve 78 and the drive shaft fitting portion 55 is seized. Oil is supplied from the supply port 57 so that it does not occur. Further, when the differential shaft differential rotation speed Nd is higher than the threshold value NdNG, the arithmetic unit 61 opens the valve 74 and supplies oil from the supply port 58 so that the pinion gear fitting portion 56 is not seized.

  The valve 81 that controls the oil supplied to the supply port 85 has a differential shaft differential rotation when the differential shaft torque Td is higher than the threshold value Nd and the differential shaft differential rotation speed Nd is higher than the threshold value NdNG. When only the number Nd is higher than the threshold value NdNG, it can be released by the arithmetic unit 61. Further, the position of the supply port 85 is not limited to the end portion in the differential storage portion 4d or the differential storage portion 4d, and may be arranged at other positions in the case 4. In addition, the arithmetic unit 61 determines whether the drive shaft fitting portion 55 or the pinion gear fitting portion 56 satisfies the seizure occurrence condition based on at least one of the differential shaft torque Td or the differential shaft differential rotation speed Nd and the oil temperature. It may be determined whether or not.

  As described above, the vehicle drive device according to the present embodiment includes the oil passages 72, 73, 75, 76, 77, 79, 80, 82, the valves 74, 78, 81, and the drive shaft fitting portion 55. Alternatively, the valve 74 determines whether or not the pinion gear fitting portion 56 satisfies the seizing occurrence condition, and supplies the oil to the drive shaft fitting portion 55 or the pinion gear fitting portion 56 that is determined to satisfy the seizing occurrence condition. And an arithmetic unit 61 that controls the actuators 74a, 78a, 81a of the oil pumps 78, 81, so that a part of the oil supplied from the oil catch tank 71 to each component is supplied to the oil passages 72, 73, 75, By 76, 77, 79, 80, 82, it is supplied to the drive shaft fitting portion 55 or the pinion gear fitting portion 56 that may be seized. Therefore, even when the oil level is low, oil can be preferentially supplied to areas where there is a risk of seizure, preventing seizure due to insufficient oil supply, and driving due to excessive oil supply The agitation resistance of the shaft fitting portion 55 or the pinion gear fitting portion 56 can be reduced to prevent deterioration of fuel consumption.

  In addition, the vehicle drive device according to the present embodiment includes the first motor generator 6 and the second motor generator 9, the torque from the engine 2, and the first motor generator 6 and the second motor generator 9. And a differential 38 that rotates the drive wheels 41 and 42 by the combined torque synthesized by the power distribution mechanism 7, and the arithmetic unit 61 determines the rotational speed of the drive wheels 41 and 42. The differential rotational speed of the differential 38 is calculated from the rotational speeds of the drive wheels 41 and 42, and the engine required torque instructed to the engine 2 and the first motor generator 6 and the second motor generator 9 are instructed. Calculate the combined torque of the required motor generator torque, and the differential speed or differential torque Since it is determined whether or not the differential 38 satisfies the burn-in occurrence condition based on at least one of the torques, when the vehicle drive device 28 is mounted on the hybrid vehicle 1, the arithmetic unit 61 includes: Since the differential rotation speed and the differential shaft torque are calculated and it is determined whether or not the differential 38 satisfies the burn-in occurrence condition based on at least one of the differential rotation speed and the differential shaft torque, there is a risk of burn-in. By preferentially supplying oil to the location, seizure due to insufficient oil supply and fuel consumption deterioration due to excessive oil supply can be prevented, and in order not to satisfy the seizure occurrence condition of the differential 38, By controlling the engine required torque and the motor generator required torque, It is possible to prevent occurrence of seizure of the catcher le 38.

  Further, the vehicle drive device according to the present embodiment includes an oil temperature gauge 64 that detects the temperature of oil stored in the bottom of the case 4, and the arithmetic unit 61 has a differential rotational speed or a combined torque. Based on at least one of the differential shaft torque and the temperature of the oil detected by the oil thermometer 64, it is determined whether or not the differential 38 satisfies the seizure occurrence condition. Therefore, whether or not the seizure occurrence condition is satisfied is determined. In addition to at least one of the differential rotation speed and the combined torque, it is possible to make an accurate determination based on the temperature of the oil, so that oil should be preferentially supplied to areas where there is a risk of seizure. It can prevent seizure due to supply shortage and fuel consumption deterioration due to excessive supply of oil, and does not satisfy the conditions for occurrence of seizure of differential 38. To, by referring to the oil temperature accurately control the engine required torque and motor generator demand torque, it is possible to reliably prevent the occurrence of seizure of the differential 38.

  Further, in the vehicle drive device according to the present embodiment, the differential 38 is housed in the differential case 43 that receives the differential shaft torque that is the combined torque, the differential case 51 that rotates together with the differential ring gear 43, and the differential case 51. Pinion gear 53 and two side gears 54 housed in differential case 51 and meshed with pinion gear 53 and coupled to drive shafts 39, 40. Differential case 51 is fitted with drive shafts 39, 40. Since the oil passages 76, 77, and 79 supply oil to the upper portion of the drive shaft fitting portion 55 in the case 4, the drive shaft fitting portion 55 satisfies the seizure occurrence condition. In this case, the lubricant is supplied to the drive shaft fitting portion 55 and seized. Possibility be supplied preferentially oil in a location where there is, seizure due to insufficient supply of oil, and the deterioration of fuel efficiency by the oil supply excessive can be prevented.

  Further, in the vehicle drive device according to the present embodiment, the differential 38 is housed in the differential case 43 that receives the differential shaft torque that is the combined torque, the differential case 51 that rotates together with the differential ring gear 43, and the differential case 51. The pinion gear 53 is housed in the differential case 51 and has two side gears 54 engaged with the pinion gear 53 and coupled to the drive shafts 39 and 40. The differential case 51 is fitted with the pinion gear 53. Since the oil passages 72, 73, 75 supply oil to the upper portion of the pinion gear fitting portion 56 in the case 4 when the pinion gear fitting portion 56 satisfies the seizure occurrence condition, the pinion gear fitting is provided. Lubricating oil is supplied to the joint 56, giving priority to places where there is a risk of seizure. Yl so as to supply the image sticking due to insufficient supply of oil, and the deterioration of fuel efficiency by the oil supply excessive can be prevented.

  As described above, the vehicle drive device according to the present invention can prevent seizure due to insufficient supply of oil and reduce the agitation resistance of components due to excessive supply of oil to prevent deterioration of fuel consumption. This is useful for vehicle drive devices in general that supply lubricating oil to components that transmit torque from a power source to left and right drive wheels.

1 is a skeleton diagram of a hybrid vehicle of an FF (front engine front drive; engine front front wheel drive) type equipped with a vehicle drive device according to an embodiment of the present invention. It is sectional drawing which shows the cross section of the horizontal direction of the vehicle drive device which concerns on one embodiment of this invention. It is sectional drawing which cut | disconnected the vehicle drive device which concerns on one embodiment of this invention by arrow AA of FIG. 2, and shows the lubrication system | strain of a vehicle drive device. It is a flowchart which shows the drive shaft fitting part burn-in determination operation | movement of the vehicle drive device which concerns on one embodiment of this invention. It is a flowchart which shows the pinion gear fitting part burn-in determination operation | movement of the vehicle drive device which concerns on one embodiment of this invention. It is a seizure determination graph used in the drive shaft fitting portion burn-in determination operation and the pinion gear fitting portion burn-in determination operation of the vehicle drive device according to the embodiment of the present invention.

Explanation of symbols

1 Hybrid vehicle 2 Engine (power source, internal combustion engine)
4 Case 4d Differential storage 6 First motor generator (power source, electric motor)
7 Power distribution mechanism (torque synthesis means)
8 Transmission mechanism 9 Second motor generator (power source, electric motor)
28 Vehicle Drive System 38 Differential (Differential Device)
39, 40 Drive shaft 41, 42 Drive wheel 43 Differential ring gear 51 Differential case 53 Pinion gear 54 Side gear 55 Drive shaft fitting portion 56 Pinion gear fitting portion 61 Arithmetic unit (burn-in condition determining means, opening / closing control means, differential rotation speed calculating means, Torque calculation means)
64 Oil temperature gauge (lubricating oil temperature detection means)
65, 67, 69, 70 Oil passage (first supply pipe)
66 Oil pump (first supply pipe)
68 Oil cooler (first supply pipe)
72, 73, 75, 76, 77, 79, 80, 82 Oil passage (second supply pipe)
74, 78, 81 Valve (opening / closing means)
74a, 78a, 81a Actuator (opening / closing means)

Claims (5)

In a vehicle drive device comprising: a plurality of components that transmit torque from a power source to left and right drive wheels; and a first supply pipe that supplies lubricant to the components.
At least one second supply pipe branched from the first supply pipe to supply lubricating oil to at least one of the plurality of constituent elements;
Opening and closing means provided on the second supply pipe so as to open and close the second supply pipe;
A burn-in condition determination means for determining whether or not a burn-in occurrence condition of a component to which lubricating oil is supplied from the second supply pipe is satisfied;
Control means for controlling the opening and closing means to supply lubricating oil to components determined to satisfy the burn-in occurrence condition by the burn-in condition determining means;
A vehicle drive device comprising: The plurality of constituent elements include an electric motor, torque synthesizing means for synthesizing torque from the internal combustion engine and torque from the electric motor, and a differential device for rotating the left and right drive wheels by the synthesized torque synthesized by the torque synthesizing means. And consists of
Differential rotation speed calculating means for measuring the rotation speed of the left and right drive wheels and calculating the differential rotation speed of the differential device from the rotation speed of the left and right drive wheels;
Torque calculating means for calculating a combined torque of the required torque instructed to the internal combustion engine and the required torque instructed to the electric motor,
Whether the burn-in condition determination means satisfies the burn-in occurrence condition based on at least one of the differential rotation speed calculated by the differential rotation speed calculation means and the combined torque calculated by the torque calculation means. The vehicle drive device according to claim 1, wherein it is determined whether or not. A case housing the electric motor, the torque synthesizing unit, and the differential; and a lubricating oil temperature detecting unit that detects a temperature of the lubricating oil stored in the bottom of the case. Based on at least one of the differential rotational speed calculated by the differential rotational speed calculating means and the combined torque calculated by the torque calculating means, and the temperature of the lubricating oil detected by the lubricating oil temperature detecting means, the differential device The vehicle drive device according to claim 2, wherein it is determined whether or not a condition for occurrence of burn-in is satisfied. The differential device includes a differential ring gear to which the combined torque is input, a differential case that rotates together with the differential ring gear, a pinion gear that is accommodated in the differential case, and is accommodated in the differential case and meshes with the pinion gear. The differential case has a drive shaft fitting portion into which the drive shaft is fitted, and the lubricating oil is passed through the second supply pipe to the drive shaft fitting portion. The vehicle drive device according to claim 2, wherein the vehicle drive device is supplied. The differential device includes a differential ring gear to which the combined torque is input, a differential case that rotates together with the differential ring gear, a pinion gear that is pivotally supported in the differential case, a pivotal support that is supported in the differential case, and a gear that meshes with the pinion gear. And the differential case has a pinion gear fitting portion into which the pinion gear is fitted, and lubricating oil is supplied to the pinion gear fitting portion through the second supply pipe. The vehicle drive device according to claim 2, wherein the vehicle drive device is provided.