JP2021142970A - Hybrid vehicle lubrication device - Google Patents

Abstract

To provide an orifice while suppressing that a path length of a second supply path becomes long, and assembly man-hours increase.SOLUTION: Since an orifice 80, which restricts circulation of lubrication oil in a second supply path 64, is provided integrally on a pump cover 92 of an O/P pump 42, a path length of the second supply path 64 is shortened and can be easily provided in a transaxle case 50, and assembly man-hours of the second supply path 64 can be reduced compared to the case that the orifice 80, which is separately constituted, is provided on an intermediate part of a pipeline 65 constituting the second supply path 64, or is interposed between the pipeline 65 and the O/P pump 42.SELECTED DRAWING: Figure 3

Description

The present invention relates to a lubrication device for a hybrid vehicle, and more particularly to an improvement of a lubrication device in which an orifice is provided in a supply path for supplying lubricating oil.

(a) Applicable to hybrid vehicles having an engine, a traveling rotary machine, and a power transmission device that transmits the driving force transmitted from the engine and the traveling rotary machine to the drive wheels via an output unit. , (B) A first mechanical oil pump that is mechanically driven to rotate with the rotation of the output unit, (c) a second mechanical oil pump that is mechanically driven to rotate by the engine, and (d). ) It is connected to the discharge side of the first mechanical oil pump, supplies lubricating oil to at least the traveling rotary machine, and is connected to a relief valve at an intermediate position before reaching the traveling rotary machine. A first supply path, (e) a second supply path connected to the discharge side of the first mechanical oil pump, and supplying lubricating oil to at least the output unit via an orifice, and (f) the second supply path. It is connected to the discharge side of the mechanical oil pump and is connected to the first mechanical oil pump side from the intermediate position to which the relief valve of the first supply path is connected, and is connected to the first mechanical oil pump side via the first supply path. A lubricator having a third supply path for supplying lubricating oil to the traveling rotary machine is known. The device described in Patent Document 1 is an example thereof, in which the output shaft MOP 52 is a first mechanical oil pump and the input shaft MOP 51 is a second mechanical oil pump.
The term "lubrication" as used herein includes not only the purpose of preventing friction and wear, but also the case of supplying lubricating oil to, for example, a rotating machine to cool the machine.

JP-A-2019-119402

However, if an orifice is provided in the pipe constituting the second supply path, there is a problem that the path length of the second supply path is lengthened by the orifice and the assembly man-hours are increased.

The present invention has been made in the background of the above circumstances, and an object of the present invention is to provide an orifice while suppressing an increase in the path length of the second supply path and an increase in assembly man-hours. be.

In order to achieve such an object, the present invention (a) transmits the driving force transmitted from the engine, the traveling rotary machine, the engine, and the traveling rotating machine to the drive wheels via the output unit. It is applied to a hybrid vehicle having a power transmission device, and (b) a first mechanical oil pump that is mechanically rotationally driven by the rotation of the output unit, and (c) mechanically rotationally driven by the engine. The second mechanical oil pump is connected to (d) the discharge side of the first mechanical oil pump to supply lubricating oil to at least the traveling rotary machine and reach the traveling rotating machine. The first supply path to which the relief valve is connected to the front intermediate position and (e) are connected to the discharge side of the first mechanical oil pump and supply lubricating oil to at least the output portion via an orifice. The first mechanical oil pump is connected to the second supply path and (f) the discharge side of the second mechanical oil pump, and is connected to the relief valve of the first supply path from the intermediate position. In a lubrication device having a third supply path connected to the side and supplying lubricating oil to the traveling rotary machine through the first supply path, (g) the orifice is the first mechanical type. It is characterized in that it is integrally provided with the case member of the oil pump.

In such a hybrid vehicle lubricator, an orifice that restricts the flow of lubricating oil in the second supply path is integrally provided with the case member of the first mechanical oil pump, so that the orifice is configured separately. Is arranged in the middle part of the pipe constituting the second supply path or is interposed in the connecting part between the pipe and the first mechanical oil pump, and the path length of the second supply path is shortened. At the same time, the assembly manpower is reduced.

It is the outline figure which developed and showed the power transmission device of the hybrid vehicle to which this invention was applied. It is a hydraulic circuit diagram explaining the lubrication device provided in the hybrid vehicle of FIG. It is sectional drawing of the O / P pump provided in the lubrication device of FIG.

The present invention can be applied to various hybrid vehicles having a traveling rotary machine in addition to an engine as a driving force source for traveling. The engine is an internal combustion engine such as a gasoline engine or a diesel engine. As the traveling rotary machine, for example, a motor generator that can be selectively used as an electric motor and a generator is suitable, but an electric motor can also be used. The output unit of the power transmission device that drives the first mechanical oil pump is, for example, a differential device that distributes the driving force transmitted from the engine and the traveling rotor to the left and right drive wheels. When a transmission mechanism such as a reduction gear device or a transmission that transmits the transmitted driving force to the differential device is provided, the transmission mechanism can also be regarded as an output unit.

As the power transmission device, a horizontal transaxle such as FF (front engine / front drive) in which a plurality of shafts are arranged along the vehicle width direction is preferably used, but FR type or four-wheel drive type power is used. It may be a transmission device. The power transmission device includes, for example, (a) a rotating machine for differential control, (b) a first rotating element connected to the engine, a second rotating element connected to the rotating machine for differential control, and the output. It is configured to include an electric differential portion having a differential mechanism having a third rotating element connected to the portion. A motor generator is suitable as a rotary device for differential control of an electric differential unit, but a generator can also be used. By setting the torque of the differential control rotating machine to 0, the differential mechanism can be differentially rotated, and the engine can be prevented from rotating. As the differential mechanism of the electric differential unit, a single pinion type or double pinion type single planetary gear device is preferably used. The present invention may also be applied to a hybrid vehicle that does not have an electric differential.

The first supply path is configured to supply lubricating oil to the differential control rotating machine of the electric differential unit as needed. An oil cooler is provided in the first supply path on the traveling rotary machine side as necessary from the intermediate position where the relief valve is connected, and the lubricating oil cooled by the oil cooler is used for the traveling rotary machine or differential. It is supplied to the control rotary machine. As the oil cooler, for example, a water-cooled oil cooler that cools the lubricating oil by water cooling is suitable, but an air-cooled oil cooler that cools the lubricating oil by air cooling can also be adopted. The third supply path is branched as necessary between the connection position with the first supply path and the second mechanical oil pump, and the differential of the electric differential unit is branched through the branched branch path. It is configured to supply lubricating oil to the control rotor and differential mechanism.

The first mechanical oil pump and the second mechanical oil pump include, for example, an internal gear type having an internal tooth gear rotor and an external tooth gear rotor meshed with each other, and an external gear type consisting of a pair of external tooth gear rotors meshed with each other. A gear type oil pump or a vane type oil pump having a vane rotor is preferably used. The first mechanical oil pump is, for example, a pump body provided integrally or separately in a case accommodating a power transmission device, and a pump integrally fixed to the pump body to form a rotor accommodating chamber inside. It includes a cover and a rotor that is arranged in the rotor accommodating chamber and is rotationally driven by the output unit. Then, an orifice is integrally provided on the pump body or the pump cover corresponding to the case member of the pump. When the lubricating oil is discharged to the side surface side of the rotor, the orifice is provided continuously from the rotor accommodating chamber, for example, on the side surface portion of the rotor (the surface orthogonal to the rotation axis). That is, an orifice is provided as a discharge port for discharging the lubricating oil. When the lubricating oil is discharged to the outer peripheral side of the rotor, an orifice may be provided on the outer peripheral side thereof. The arrangement position and orientation of the orifice are appropriately determined according to the type and arrangement position of the first mechanical oil pump, the discharge direction of the lubricating oil, the arrangement condition of the second supply path, etc., and the orifice is separated from the discharge port. May be provided.

When an oil hole having a circular cross section is provided as an orifice, it is desirable that the axial length L thereof be longer than the hole diameter (diameter) d (d <L). That is, if the axial length L of the orifice is lengthened, the wall friction increases at a low oil temperature with high viscosity, so that the cross-sectional area in which the lubricating oil actually flows becomes small and the flow of the lubricating oil is hindered. , The load can be reduced by appropriately suppressing the viscosity of the second supply path, and the amount of lubricating oil supplied from the first supply path to the traveling rotary machine increases, so that the engine can be warmed up quickly. On the other hand, when the viscosity is low and the oil temperature is high, the wall friction becomes small, so that the flow cross-sectional area of the lubricating oil becomes substantially large and the amount of lubricating oil supplied into the second supply path increases, so that the lubrication performance for the output portion is increased. Can be properly secured. The cross-sectional shape of the orifice does not necessarily have to be circular, and when the cross-sectional area is A, substantially the same effect can be obtained even if 2 × √ (A / π) <L. The cross-sectional shape of the orifice can be in various forms such as an ellipse, a quadrangle such as a square, a rectangle, a trapezoid, and a rhombus, or a polygon such as a triangle or a pentagon or more. It should be noted that an orifice of d ≧ L or 2 × √ (A / π) ≧ L can also be adopted.

Hereinafter, examples of the present invention will be described in detail with reference to the drawings. In the following examples, the drawings are appropriately simplified or modified for the sake of explanation, and the dimensional ratios and shapes of each part are not necessarily drawn accurately.

FIG. 1 is an outline diagram illustrating a power transmission device 12 of a hybrid vehicle 10 to which the present invention is applied, and is developed so that a plurality of axes constituting the power transmission device 12 are located in a common plane. It is a development view shown by. The power transmission device 12 is a transaxle for a horizontal hybrid vehicle such as an FF vehicle in which a plurality of axes are arranged along the vehicle width direction, and the first axis S1 to the fifth axis S5 substantially parallel to the vehicle width direction. It has. An input shaft 22 connected to the engine 20 is provided on the first axis S1, and a single pinion type planetary gear device 24 and a first motor generator MG1 are arranged concentrically with the first axis S1. ing. The engine 20 is an internal combustion engine that generates power by burning fuel. The input shaft 22 is inserted through the axis of the planetary gear device 24 and the first motor generator MG1 and protrudes to the side opposite to the engine 20 to rotationally drive the I / P (input) pump 40. The I / P pump 40 is a second mechanical oil pump that is connected to the input shaft 22 and mechanically rotationally driven by the engine 20.

The planetary gear device 24 and the first motor generator MG1 function as an electric differential unit 26. The input shaft 22 is connected to the carrier 24c of the planetary gear device 24, which is a differential mechanism, and the first motor generator is connected to the sun gear 24s. The MG1 is connected, and the ring gear 24r is provided with the engine output gear Ge. The carrier 24c is a first rotating element, the sun gear 24s is a second rotating element, the ring gear 24r is a third rotating element, and the first motor generator MG1 corresponds to a differential control rotating machine. The first motor generator MG1 is selectively used as an electric motor and a generator, and the rotation speed of the engine 20 is continuously controlled by continuous control of the rotation speed of the sun gear 24s by regenerative control or the like functioning as a generator. Is continuously changed and output from the engine output gear Ge. Further, the torque of the first motor generator MG1 is set to 0 and the sun gear 24s is idled, so that the engine 20 is prevented from rotating.

A reduction gear device 30 provided with a reduction gear Gr1 and a reduction gear Gr2 at both ends of the shaft 28 is disposed on the second axis S2, and the reduction gear Gr1 is meshed with the engine output gear Ge. ing. The reduction gear Gr1 is also meshed with the motor output gear Gm of the second motor generator MG2 arranged on the third axis S3. The second motor generator MG2 is selectively used as an electric motor and a generator, and is used as a driving force source for traveling of the hybrid vehicle 10 by power running control so as to function as an electric motor. The second motor generator MG2 corresponds to a traveling rotary machine.

The reduction gear Gr2 is meshed with the differential gear Gd of the differential device 32 arranged on the fourth axis S4, and the driving force transmitted from the engine 20 and the second motor generator MG2 to the reduction gear Gr1 respectively. Is distributed from the reduction gear Gr2 to the left and right drive shafts 36 via the differential device 32, and is transmitted to the left and right drive wheels 38. A pump drive gear Gp provided on the pump shaft 44 of the O / P (output) pump 42 arranged on the fifth axis S5 is meshed with the differential gear Gd, and is engaged with the rotation of the differential device 32. The O / P pump 42 is mechanically rotationally driven. The reduction gear device 30 having the reduction gear Gr1 and the reduction gear Gr2 and the differential device 32 correspond to the output unit, and the O / P pump 42 mechanically rotates with the rotation of the differential device 32 which is the output unit. It is a driven first mechanical oil pump. The O / P pump 42 may be rotationally driven by engaging the pump drive gear Gp with a rotating member that rotates mechanically in conjunction with the differential device 32, for example, the reduction gear Gr2.

Such a power transmission device 12 includes a transaxle case 50 (hereinafter, simply referred to as a case 50) that houses each of the above functional components and is integrally fixed to the engine 20. The case 50 is composed of four case members, a housing 52, a case body 54, a pump body 56 forming a part of the I / P pump 40, and a rear cover 58 from the engine 20 side, and is composed of a large number of fastening bolts. They are integrally bolted to each other. Further, the housing 52 is integrally fixed to the engine 20 by a large number of fastening bolts.

FIG. 2 is a hydraulic circuit diagram of the lubrication device 60 included in the hybrid vehicle 10. The lubrication device 60 includes the I / P pump 40 and the O / P pump 42 as suction devices, and has a first supply path 62 shown by a solid line, a second supply path 64 shown by an alternate long and short dash line, and a third supply path shown by a broken line. Each part of the power transmission device 12 is shared and lubricated via the supply path 66. The I / P pump 40 and the O / P pump 42 suck the lubricating oil from the oil storage portion provided at the bottom of the case 50 via the strainers 70 and 72, respectively, and output the lubricating oil to the supply paths 62, 64, 66. Although the strainers 70 and 72 are separately provided in this embodiment, the I / P pump 40 and the O / P pump 42 may be configured to suck the lubricating oil from the common strainer.

Since the O / P pump 42 is connected to the differential device 32 and is rotationally driven, it is rotationally driven even in the EV traveling mode in which the engine 20 is stopped, and the lubricating oil is sucked in at an intake amount corresponding to the vehicle speed V to be sucked into each part. Lubricating oil can be supplied to. Since the engine 20 that rotationally drives the I / P pump 40 can be driven even when the vehicle is stopped, it is possible to inhale the lubricating oil at an intake amount that does not depend on the vehicle speed V, including when the vehicle is stopped, and supply the lubricating oil to the lubricated portion. However, in the EV traveling mode, the operation of the I / P pump 40 is also stopped as the rotation of the engine 20 is stopped. As the I / P pump 40 and the O / P pump 42, for example, an inscribed gear type, a circumscribed gear type gear type oil pump, or a vane type oil pump is preferably used.

The first supply path 62 is connected to the discharge side of the O / P pump 42 to supply lubricating oil to the motor generators MG1 and MG2. In FIG. 2, the downward arrow with respect to the motor generators MG1 and MG2 means that the lubricating oil is allowed to flow down from above the motor generators MG1 and MG2 to cool the stator and the like, and the oil passage provided on the side wall and the like of the case 50. Alternatively, the lubricating oil is discharged from a pipe or the like arranged in the case 50 to flow down. Further, the upward arrow with respect to the motor generators MG1 and MG2 means that lubricating oil is supplied from the center side of the motor generators MG1 and MG2 to cool and lubricate the rotor and bearings, and the input shaft 22 and the rotor shaft and the like. Lubricating oil is discharged from the provided oil passage. Relief valves 74 and 76 are connected to the first supply path 62 at intermediate positions before reaching the motor generators MG1 and MG2, so that the oil pressure in the first supply path 62 is prevented from becoming excessive. Further, an oil cooler 78 is provided on the motor generators MG1 and MG2 side from the intermediate position where the relief valves 74 and 76 are connected, and the lubricating oil cooled by the oil cooler 78 is supplied to the motor generators MG1 and MG2. Will be done. In this embodiment, the oil cooler 78 is a water-cooled cooler that cools the lubricating oil by water cooling, and is arranged outside the case 50. It should be noted that it is not always necessary to provide two relief valves 74 and 76, and only one of them may be provided.

The second supply path 64 is connected to the discharge side of the O / P pump 42, and supplies lubricating oil to the reduction gear device 30, the differential device 32, and the like via the orifice 80. The orifice 80 limits the amount of lubricating oil that flows into the second supply path 64, prevents the oil pressure in the second supply path 64 from becoming excessive, and also prevents the O / P pump 42 from becoming the first supply path. The amount of lubricating oil flowing into the 62 can be appropriately secured. The second supply path 64 includes a pipe 65 that is separate from the case 50, and the pipe 65 is connected to the O / P pump 42 to supply lubricating oil to the reduction gear device 30 and the differential device 32. , Lubricating oil is allowed to flow down from above the reduction gear device 30 and the differential device 32 to lubricate the gear meshing portion, the bearing, and the like. In addition to the pipe 65, an oil passage may be provided in a rotating member such as the case 50 or the shaft 28 to form a part of the second supply path 64.

The third supply path 66 is connected to the discharge side of the I / P pump 40 and is also connected to the first supply path 62, and the lubricating oil is supplied to the motor generators MG1 and MG2 via the first supply path 62. To supply. The confluence 66c of the third supply path 66 with respect to the first supply path 62 is located on the O / P pump 42 side of the intermediate position where the relief valves 74 and 76 are connected, and is in front of the confluence 66c, that is, I /. A check valve 82 is provided on the P pump 40 side to allow the flow of lubricating oil toward the confluence point 66c side, but to prevent the flow in the reverse direction. A check valve 84 is provided in front of the confluence point 66c of the first supply path 62, that is, on the O / P pump 42 side, to allow the flow of lubricating oil toward the confluence point 66c side, but to prevent the flow in the reverse direction. ing. The third supply path 66 includes a branch path 68 branched at a branch point 66d between the check valve 82 and the I / P pump 40, and the electric differential unit via the branch path 68. Lubricating oil is supplied to the first motor generator MG1 and the planetary gear device 24 of the 26. The branch path 68 supplies lubricating oil through, for example, an oil passage provided in an input shaft 22 or a rotor shaft of the first motor generator MG1 to cool the rotor of the first motor generator MG1 or a planetary gear device 24. Lubricate gear meshing parts and bearings.

Here, if the orifice 80 is provided in the pipe 65 constituting the second supply path 64, the path length of the second supply path 64 becomes longer by the orifice 80, and it becomes difficult to arrange the second supply path 64 in the case 50. 2 The man-hours for assembling the supply path 64 may increase. Therefore, in this embodiment, the orifice 80 is provided in the O / P pump 42 as shown in FIG. In FIG. 3, the O / P pump 42 is arranged in a pump body 90, a pump cover 92 integrally fixed to the pump body 90 to form a rotor accommodating chamber 91, and the rotor accommodating chamber 91. It is configured to include a pair of external tooth gear rotors 94 and internal tooth gear rotors 96 that are installed and rotationally driven. That is, FIG. 3 shows a case where the O / P pump 42 is an internal gear type oil pump, and includes an external tooth gear rotor 94 and an internal tooth gear rotor 96 that are meshed with each other, and the inner external tooth gear rotor 94 is a pump. By being connected to the shaft 44 so as to be able to transmit power by spline fitting or the like and driven to rotate, the lubricating oil is sucked from the suction port 98 and the lubricating oil is supplied to the first supply path 62 and the second supply path 64. Discharge. Lubricating oil is supplied to the second supply path 64 through the orifice 80 which forms a part of the discharge port. The pump body 90 and the pump cover 92 correspond to the case members of the O / P pump 42, and the pump body 90 is provided integrally with the case body 54 of the transaxle case 50, for example, or is separately configured by a fastening bolt or the like. It is fixed integrally. Further, the pump shaft 44 provided with the pump drive gear Gp is arranged so as to straddle the pump body 90 and the pump shaft support portion 52s provided in the housing 52, and is arranged with the fifth axis S5 via a bearing. It is rotatably supported around a concentric axis.

The O / P pump 42 discharges lubricating oil to the side surface sides of the rotors 94 and 96, and the orifice 80 is located on the side surface portions of the rotors 94 and 96, that is, in the direction of the fifth axis S5 parallel to the fifth axis S5. The rotor accommodating chamber 91 is continuously provided in a portion adjacent to the rotor accommodating chamber 91. The pump cover 92 is integrally provided with a connecting port 102 that is continuous with the orifice 80 and projects in the fifth axis S5 direction, and lubricates the fifth axis S5 direction that is perpendicular to the side surfaces of the rotors 94 and 96. Oil is circulated. The connecting port 102 has a substantially cylindrical shape, and the pipe 65 of the second supply path 64 is connected to the connecting port 102. The orifice 80 is an oil hole having a circular cross section, and its circulation cross-sectional area A is smaller than that of the connecting port 102. It is provided at the bottom of the connecting port 102 so as to do so. Although not shown, a connecting port to which the pipes and the like of the first supply path 62 are connected is provided separately from the connecting port 102.

The axial length L of the orifice 80 is longer than the hole diameter (diameter) d, and when the flow cross-sectional area A of the orifice 80 and the axial length L are compared, the relationship is 2 × √ (A / π) <L. .. In the orifice 80 having a long axial length L as compared with the hole diameter d, the wall friction becomes large at a low oil temperature with high viscosity, so that the cross-sectional area where the lubricating oil actually flows becomes small and lubrication is performed. Since the oil flow is obstructed, the hydraulic pressure in the second supply path 64 can be appropriately suppressed to reduce the load, and the amount of lubricating oil supplied from the first supply path 62 to the motor generators MG1 and MG2 increases. Each part of the power transmission device 12 including the lubricating oil can be quickly warmed up. On the other hand, when the viscosity is low and the oil temperature is high, the wall friction becomes small, so that the flow cross-sectional area of the lubricating oil becomes substantially large and the amount of lubricating oil supplied into the second supply path 64 increases, which is the output unit. The lubrication performance for the reduction gear device 30 and the differential device 32 can be appropriately ensured. Since the axial length L of the orifice 80 becomes longer, the axial length of the O / P pump 42 becomes longer, so that the axial length L is, for example, 2d or less, or 4 × √ (A / π) or less. Is desirable.

As described above, in the lubricating device 60 of the hybrid vehicle 10 of the present embodiment, the orifice 80 that restricts the flow of the lubricating oil in the second supply path 64 is integrally provided with the pump cover 92 of the O / P pump 42. Therefore, it is compared with the case where the separately configured orifice 80 is arranged in the intermediate portion of the pipe 65 constituting the second supply path 64 or is interposed between the pipe 65 and the O / P pump 42. As a result, the path length of the second supply path 64 is shortened so that the second supply path 64 can be easily arranged in the transformer axle case 50, and the number of steps for assembling the second supply path 64 is reduced.

Further, in this embodiment, since the orifice 80 is continuously provided in the rotor accommodating chamber 91 so as to form a part of the discharge port of the O / P pump 42, the O / P pump 42 is kept compact. An orifice 80 can be provided.

Although the embodiments of the present invention have been described in detail with reference to the drawings, this is merely an embodiment, and the present invention shall be carried out in a mode in which various modifications and improvements are made based on the knowledge of those skilled in the art. Can be done.

10: Hybrid vehicle 12: Power transmission device 20: Engine 30: Reduction gear device (output unit) 32: Differential device (output unit) 38: Drive wheel 40: I / P pump (second mechanical oil pump) 42: O / P pump (first mechanical oil pump) 60: Lubrication device 62: First supply path 64: Second supply path 66: Third supply path 74, 76: Relief valve 80: orifice 90: Pump body (case member) 92: Pump cover (case member) MG2: Second motor generator (running rotary machine)

Claims (1)

It is applied to a hybrid vehicle having an engine, a traveling rotary machine, and a power transmission device that transmits the driving force transmitted from the engine and the traveling rotary machine to the drive wheels via an output unit.
A first mechanical oil pump that is mechanically rotationally driven as the output unit rotates,
A second mechanical oil pump that is mechanically rotationally driven by the engine,
A first that is connected to the discharge side of the first mechanical oil pump, supplies lubricating oil to at least the traveling rotary machine, and is connected to a relief valve at an intermediate position before reaching the traveling rotary machine. 1 supply route and
A second supply path connected to the discharge side of the first mechanical oil pump and supplying lubricating oil to at least the output portion via an orifice.
The first supply is connected to the discharge side of the second mechanical oil pump and is connected to the first mechanical oil pump side from the intermediate position to which the relief valve of the first supply path is connected. A third supply path for supplying lubricating oil to the traveling rotary machine via the path, and
In a lubrication device with
A hybrid vehicle lubrication device, wherein the orifice is integrally provided with a case member of the first mechanical oil pump.

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