JP6477628B2 - Lubricating device for vehicle power transmission device - Google Patents

Description

  The present invention relates to a lubricating device for a vehicle power transmission device, and more particularly to a technique for reducing energy loss due to agitation of lubricating oil accompanying rotation of an output portion.

(a) A vehicle power transmission device that is housed in a case and transmits a driving force from a driving force source to driving wheels via an output unit, and (b) an oil reservoir provided at the bottom of the case The lubricating oil is sucked by the suction device and supplied to each part of the power transmission device, and the oil storage portion is divided into a first oil storage portion below the output portion and other portions by the partition wall. Lubricating devices have been proposed. The device described in Patent Document 1 is an example, and the lubricating oil in the first oil reservoir is sucked in by the suction device, so that the oil level of the lubricating oil is lowered, and the lubricating oil accompanying the rotation of the output unit is reduced. Mechanical energy loss due to stirring is reduced. Patent Document 2 describes a technique in which an oil pump that is mechanically driven to rotate with rotation of an output unit of a power transmission device is used as an inhaler.
“Lubrication” in the present specification includes not only the prevention of friction and wear but also the case of cooling by supplying lubricating oil to an electric motor, for example.

JP 2011-27142 A JP 2012-106599 A

  However, in such a conventional lubrication apparatus, if the oil surface height of the first oil reservoir is reduced in order to reduce energy loss due to agitation of the lubricating oil accompanying the rotation of the output portion, the structural ( Since it is difficult to ensure sufficient depth of the lubricating oil to secure the minimum ground clearance, etc., the oil pump suction port is exposed on the oil surface, so that the oil suction of the oil pump, so-called air suction occurs. However, there is a possibility that the lubricating oil cannot be sufficiently supplied. When the suction performance (suction amount per rotation) of the oil pump is set so that the depth of the lubricant in the first oil reservoir increases to prevent air suction, the output immersed in the lubricant The range of the part becomes large, and the energy loss due to stirring increases.

  The present invention has been made against the background described above, and the object of the present invention is to reduce mechanical energy loss due to agitation of lubricating oil while suppressing air suction of the oil pump. is there.

In order to achieve such an object, the first invention relates to (a) a vehicle power transmission device that is housed in a case and transmits a driving force from a driving force source to driving wheels via an output portion. (b) Lubricating oil in an oil reservoir provided at the bottom of the case is sucked by a suction device and supplied to each part of the power transmission device, and the oil reservoir is separated by a partition wall at a lower portion of the output portion. In the lubricating device divided into 1 oil storage part and other parts, (c) The oil storage part is provided with a second partition that further separates parts other than the first oil storage part, A second oil reservoir adjacent to the first oil reservoir and a third oil reservoir adjacent to the second oil reservoir are formed; (d) the inhaler is adapted to rotate the output unit; Mechanically driven and rotated Together provided with an oil pump for sucking lubricating oil in the oil reservoir portion includes a second oil pump that is rotationally driven by different rotary drive source and apart from its oil pump, the output section, (e ) height of the partition wall and the second partition wall, both are set lower than quiescent oil level height of lubricating oil in a static state where the flow is stopped for lubricating oil, and the output unit The height position of the lower end of the partition wall is lower than the upper end position of the partition wall, and in the static state, at least a part of the output portion is immersed in the lubricating oil, (f) the oil pump and the second oil The suction port of the pump is divided into one and the other of the second oil storage part and the third oil storage part, and (g) the lubricating oil in the first oil storage part is transferred to the output part when the vehicle travels. With the rotation of And at least one of the second oil reservoir and the third oil reservoir is sucked in by the oil pump , so that the oil level of the first oil reservoir becomes higher than that of the partition wall. The position is lower than the upper end position.

According to a second aspect of the present invention, in the lubricating device for a vehicle power transmission device according to the first aspect , (a) a height dimension of the second partition wall is set higher than a height dimension of the partition wall; The suction port of the oil pump is disposed in the second oil reservoir, and the suction port of the second oil pump is disposed in the third oil reservoir.

  In such a lubrication device for a vehicle power transmission device, in a static state such as when the oil pump stops, the oil level at rest is higher than the partition wall, and at least a part of the output portion is lubricated. Because it is immersed, the lubricating oil is sprinkled up by the rotation of the output part when the vehicle starts, so that the lubricating oil is sprayed on each part of the power transmission device, and it is good when starting a vehicle where it is difficult to supply sufficient lubricating oil by the oil pump Can ensure proper lubrication.

  On the other hand, when the vehicle travels, the oil level height of the lubricating oil is lowered by the suction by the oil pump and the scraping by the rotation of the output unit. Part of the lubricating oil is sucked into the oil pump, and the oil surface height of the first oil storage part is further reduced by scraping up by the rotation of the output part, so that the first oil is returned regardless of the return of the lubricating oil from the lubricating part. Since the oil level of the oil reservoir is set lower than the upper end position of the partition wall, mechanical energy loss due to agitation accompanying rotation of the output unit is reduced. In particular, until the oil level is lower than the upper end of the partition wall, the oil level is lowered by both suction by the oil pump and scraping by rotation of the output unit. The area quickly decreases and energy loss due to agitation is appropriately reduced.

  In addition, since the suction port of the oil pump is disposed in a portion other than the first oil storage portion, the suction port of the oil pump and the region of the portion other than the first oil storage portion, etc. Can separately adjust the oil level height when the vehicle is running. As a result, the oil level can be adjusted so that air suction of the oil pump is suppressed, and insufficient supply of lubricating oil due to air suction can be appropriately prevented and stably supplied. That is, by dividing the oil reservoir by the partition wall, the oil surface height of the first oil reservoir is preferentially lowered while securing a sufficient amount of lubricating oil in a portion other than the first oil reservoir. Thus, the energy loss due to the stirring of the lubricating oil accompanying the rotation of the output unit can be appropriately reduced.

In addition, since the second oil pump is provided separately from the oil pump, it is possible to compensate for the shortage of the lubricating oil supply amount, and depending on another drive source, lubrication of each part can be performed with the lubricating oil supply amount independent of the vehicle speed. Can be done. In addition, since the suction port of the second oil pump is arranged at a portion other than the first oil reservoir, by setting the suction performance and the like so as not to cause air suction of the second oil pump. The air can be prevented from sucking and the lubricating oil can be supplied stably.

The second partition wall is provided in the oil reservoir, the first oil reservoir oil reservoir, the second oil reservoir portion, and the third because it is divided into an oil reservoir, an oil pump and the second oil The width dimension of each of the second oil storage section and the third oil storage section in which the pump suction port is disposed is shortened, and the deviation of the lubricating oil due to the change in the attitude of the vehicle due to the road surface gradient or the like, or the acceleration / deceleration is suppressed. Thus, fluctuations in the oil level height of the second oil storage part and the third oil storage part are reduced, and the air suction of the oil pump and the second oil pump is more appropriately suppressed. In addition, since each suction port is separately disposed in the second oil storage portion and the third oil storage portion, the lubricating oil is sucked from both of these oil storage portions, and a sufficient amount of lubricating oil can be secured. The suction performance of each oil pump can be individually set according to the required supply oil amount, the return oil amount to each oil storage portion, and the like. For example, the second oil storage portion and the second oil storage portion 3 The oil level of the oil reservoir can be adjusted.

In the second invention, since the height dimension of the second partition wall is higher than the height dimension of the partition wall, and the suction port of the oil pump is disposed in the second oil reservoir, the suction by the oil pump when starting the vehicle And when the oil level height of the lubricating oil is lowered by the scooping up by the rotation of the output unit and the oil level height becomes equal to or lower than the upper end of the second partition wall, the third oil storage unit to the second oil storage unit side Inflow of lubricating oil is restricted. For this reason, the fall of the oil level height in the 2nd oil storage part and 1st oil storage part after that is accelerated | stimulated, and the energy loss by stirring accompanying rotation of an output part is reduced rapidly.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a skeleton diagram showing a developed power transmission device for a hybrid vehicle to which the present invention is preferably applied. It is sectional drawing explaining the positional relationship of the some axis | shaft of the power transmission device of the hybrid vehicle of FIG. It is a figure explaining two types of driving modes which can be performed with the hybrid vehicle of FIG. It is a map explaining an example of the driving | running | working area | region of two types of driving modes of FIG. FIG. 2 is a hydraulic circuit diagram illustrating a lubrication device provided in the hybrid vehicle in FIG. 1. FIG. 5 is a hydraulic circuit diagram illustrating another example of a lubrication device that is preferably provided in the hybrid vehicle of FIG. 1. It is a figure explaining the other driving modes which can be performed with the hybrid vehicle of FIG. It is a figure explaining the hybrid vehicle from which a mechanical connection form of a pair of oil pump differs, and is a skeleton diagram corresponding to FIG.

  The present invention is preferably applied to an engine-driven vehicle, a hybrid vehicle having a traveling rotating machine in addition to an engine as a driving power source for traveling, etc., but an electric vehicle having only an electric motor as a driving power source The present invention can also be applied. As the traveling rotating machine, for example, a motor generator that can alternatively use the functions of an electric motor and a generator is suitable, but an electric motor can also be used. The output unit is, for example, a differential device that outputs a driving force transmitted from a driving force source via a gear mechanism or the like to left and right driving wheels. As the power transmission device, a horizontal type transaxle such as FF (front engine / front drive) in which a plurality of shafts are arranged in the vehicle width direction is preferably used. It may be a transmission device.

  For example, a first supply path for supplying lubricating oil to each part (gear, bearing, rotating machine, etc.) of the power transmission device is connected to the discharge side of the oil pump that is mechanically driven to rotate with the rotation of the output unit. The A second supply path is connected to the discharge side of the second oil pump that is rotationally driven by a rotational drive source different from the output unit. If these supply paths are configured independently of each other, each part of the power transmission device can be shared and lubricated, and the suction performance of each oil pump can be individually adjusted according to the required amount of oil depending on the lubricating oil supply site. It can be set and unnecessary lubrication can be suppressed. In addition, it is possible to appropriately set the lubrication performance and the like for each supply path, such as providing an individual heat exchanger such as an oil cooler or providing an oil storage for storing lubricating oil. In addition, the lubricating oil discharged from these oil pumps and the second oil pump may merge and be supplied to the lubricating parts of the respective parts of the power transmission device via a common supply path.

As the second oil pump, an oil pump that is mechanically driven to rotate by an engine is preferably used, but an electric oil pump that is driven to rotate by an electric motor for a pump can also be adopted. Oil reservoir portion may be divided into three in the longitudinal direction of the vehicle, it is also possible for dividing the vehicle both width direction. In the first oil reservoir, the second oil reservoir, and the third oil reservoir, the oil level changes individually when the oil level is below the upper end of the partition wall or the second partition wall , A communication hole or the like may be provided in the partition wall or the second partition wall to allow the lubricating oil to flow between adjacent oil storage portions. Even in that case, the oil level height changes individually due to the flow resistance by the communication hole.

  The suction performance of the oil pump and the second oil pump is appropriately determined. For example, the suction performance of the oil pump that is rotationally driven when the vehicle is running is lower than that of the second oil pump, but the suction performance may be comparable. The suction performance of the oil pump can be made higher than that of the second oil pump. The height dimension of the second partition wall may be set higher than the height dimension of the partition wall that divides the oil storage part into the first oil storage part and the other parts, or may be the same or lower. You may do it.

  The oil pump that is mechanically driven to rotate with the rotation of the output unit may be configured to be always driven to rotate with the rotation of the output unit. However, the oil pump is connected via a pump connection / disconnection device that connects and disconnects power transmission. In addition to being connected to the output unit, it can also be configured to be driven to rotate by being connected to another rotational drive source (such as an electric motor for a pump). In this case, the power transmission from the output section is cut off and connected to another rotational drive source, so that each section can be lubricated with a lubricating oil supply amount that does not depend on the vehicle speed, including when the vehicle is stopped.

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

  FIG. 1 is a skeleton diagram illustrating a power transmission device 12 of a hybrid vehicle 10 to which the present invention is preferably applied, and a plurality of axes constituting the power transmission device 12 are positioned in a common plane. FIG. 2 is a developed view illustrating the positional relationship between the plurality of axes. The power transmission device 12 is a horizontally mounted hybrid vehicle transaxle such as an FF vehicle in which a plurality of shafts are arranged along the vehicle width direction, and is housed in a case 14 shown in FIG. Case 14 is constituted by a plurality of members as needed.

  The power transmission device 12 includes a first axis S1 to a fourth axis S4 that are substantially parallel to the vehicle width direction, and an input shaft 22 connected to the engine 20 that is a driving force source is provided on the first axis S1. A single pinion type planetary gear unit 24 and a first motor generator MG1 are provided concentrically with the first axis S1. The planetary gear unit 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 unit 24, which is a differential mechanism, and the first motor generator is connected to the sun gear 24s. MG1 is connected and an engine output gear Ge is provided in the ring gear 24r. 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 alternatively used as an electric motor and a generator. The rotation speed of the engine 20 is controlled by continuously controlling the rotation speed of the sun gear 24s by regenerative control or the like that functions as a generator. Are 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, thereby preventing the engine 20 from being rotated. The engine 20 is an internal combustion engine that generates power by burning fuel.

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

  The reduction small gear Gr2 is meshed with a differential gear Gd of a differential device 32 disposed on the fourth axis S4, and the driving force from the engine 20 and the second motor generator MG2 is passed through the differential device 32 to the left and right. Are distributed to the drive shaft 36 and transmitted to the left and right drive wheels 38. The differential device 32 corresponds to an output unit, and the diff ring gear Gd corresponds to an input gear. Further, the engine output gear Ge, the reduction large gear Gr1, the reduction small gear Gr2, the diff ring gear Gd, and the like constitute a gear mechanism. As is apparent from FIG. 2, the fourth axis S4 is defined as the position below the vehicle among the first axes S1 to S4, and the second axis S2 and the third axis S3 are above the fourth axis S4. The first axis S1 is set at an obliquely upper position on the vehicle front side with respect to the fourth axis S4.

  In such a hybrid vehicle 10, an EV (Electric Vehicle) travel mode and an HV (Hybrid Vehicle) travel mode shown in FIG. 3 can be executed. For example, as shown in FIG. 4, a required driving force (accelerator operation amount, etc.) The vehicle is switched to the EV traveling mode and the HV traveling mode in accordance with a mode switching map determined using the vehicle speed V as a parameter. The EV travel mode is a mode in which the second motor generator MG2 is used as a drive power source by performing power running control with the engine 20 stopped. The EV travel mode is selected in a low required drive force, that is, a low load region. The engine 20 is substantially rotated even during traveling because the fuel supply is stopped and the torque of the first motor generator MG1 is set to 0 so that the sun gear 24s of the planetary gear unit 24 can freely rotate. Be stopped. The HV traveling mode travels using the engine 20 as a driving force source by performing regenerative control of the first motor generator MG1, and is selected in a region where the required driving force (high load) is higher than that in the EV traveling mode. . In the HV traveling mode, the second motor generator MG2 is used as a driving force source by being subjected to power running control in an assisting manner during acceleration or the like, or is always subjected to power running control and used as a driving force source.

  Instead of the HV traveling mode or in addition to the HV traveling mode, an engine traveling mode that always travels using only the engine 20 as a driving force source may be provided. Further, the power transmission device 12 of the hybrid vehicle 10 is merely an example, and a double pinion type planetary gear device is adopted as the planetary gear device 24, a configuration using a plurality of planetary gear devices, or a second motor. The generator MG2 can be arranged concentrically with the first axis S1, or a mechanical transmission can be employed in place of the electric differential section 26. Various modes are possible.

  On the other hand, the hybrid vehicle 10 of the present embodiment includes a lubricating device 40 shown in FIG. The lubrication device 40 includes a first oil pump P1 and a second oil pump P2 as suction devices, and is connected to different independent first supply path 42 and second supply path 44, respectively. The lubrication is shared. As shown in FIG. 1, the first oil pump P1 is a mechanical oil pump that is mechanically driven through a pump drive gear Gp meshed with the diffring gear Gd, and the second oil pump P2 is A mechanical oil pump coupled to the input shaft 22 and mechanically driven to rotate by the engine 20. The first oil pump P1 can be driven to rotate by meshing the pump drive gear Gp with the reduction large gear Gr1, the reduction small gear Gr2, and the like rotating in conjunction with the diff ring gear Gd. The second oil pump P2 is an oil pump that is rotationally driven by a rotational drive source that is different from the output unit (differential device 32). In this embodiment, the second oil pump P2 is an oil pump that is rotationally driven by the engine 20. An electric oil pump that is rotationally driven by an electric motor can also be employed.

  The first oil pump P <b> 1 and the second oil pump P <b> 2 suck in the lubricating oil from the oil reservoir 46 provided at the bottom of the case 14 and output it to the supply paths 42 and 44. The oil reservoir 46 is configured by the case 14 itself, and includes a first oil reservoir 50 in which a rear side portion in the vehicle front-rear direction is separated from other portions by a first partition wall 48. The first oil reservoir 50 is a portion located below the differential device 32 that is an output unit. Further, a portion other than the first oil reservoir 50, that is, a portion located below the first axis S1 where the planetary gear device 24 and the like are arranged is further divided into two in the vehicle longitudinal direction by the second partition wall 52, A second oil reservoir 54 in the central portion adjacent to the first oil reservoir 50 and a third oil reservoir 56 in the vehicle front side adjacent to the second oil reservoir 54 are provided. The suction port 58 of the first oil pump P1 is disposed in the second oil reservoir 54, and the suction port 60 of the second oil pump P2 is disposed in the third oil reservoir 56. These suction ports 58 and 60 are connected to oil pumps P1 and P2 through separate suction oil passages provided independently.

  The first partition wall 48 and the second partition wall 52 have an oil surface height while allowing lubricating oil to flow between the first oil reservoir 50, the second oil reservoir 54, and the third oil reservoir 56. Functions as a distribution restriction unit that restricts the balance of That is, when the vehicle stops, both the oil pumps P1 and P2 stop operating, and the oil level height Lst in a static state in which the fluctuation of the oil level stops stops. The lubrication level supplied to each part of the power transmission device 12 As the oil flows down and returns to the oil reservoir 46, the oil level in the oil reservoirs 50, 54, and 56 is the same, as shown by the two-dot chain lines in FIG. 2 and FIG. However, when the vehicle is running or when the oil pumps P1 and P2 are operated, the lubricating oil is supplied to each part of the power transmission device 12 and the amount of the lubricating oil in the oil reservoir 46 is reduced, so that the oil level height is reduced by the partition wall 48. 52, the oil level height of the oil reservoirs 50, 54, 56 changes individually as indicated by the solid line due to the flow restriction by the partition walls 48, 52. As described above, in the static state, the oil level is higher than the partition walls 48 and 52, but when the lubricating oil is supplied when the vehicle is running, the oil level height is not higher than the partition walls 48 and 52 regardless of the return of the lubricating oil from the lubrication part. The height dimensions of the partition walls 48 and 52, the suction performance of the oil pumps P1 and P2, the area of the oil reservoir 46, and the like are determined so as to be lower than the upper end position.

  The height position, that is, the upper end position of the first partition wall 48 and the second partition wall 52 is higher than the lower end position of the differential device 32, and in the static state where the oil level is higher than the partition walls 48, 52, The part is immersed in the lubricating oil. When a part of the differential device 32 is immersed in the lubricating oil in this way, the lubricating oil is sprinkled up by the diff ring gear Gd and the like when starting the vehicle, so that the lubricating oil is scattered on each part of the power transmission device 12 and the first oil A good lubrication state can be ensured even when the vehicle starts, where it is difficult to supply a sufficient amount of lubricating oil by the pump P1. When the vehicle starts, the engine 20 is normally stopped in the EV travel mode, and the second oil pump P2 is also stopped.

  On the other hand, when the oil pump P1 or P2 is operated including when the vehicle is running, the oil level is lowered by the scraping by the differential ring gear Gd rotating according to the vehicle speed V or the suction by the oil pumps P1 and P2, and the partition wall 48, Lower than 52. In the first oil reservoir 50, the oil level is determined by the balance (balance) between the scraping by the differential ring gear Gd and the like and the amount of return oil. In the second oil reservoir 54, suction and return by the oil pump P1 are performed. The oil level height is determined by the balance with the oil amount, and the oil level height is determined by the balance between the suction by the oil pump P2 and the return oil amount in the third oil reservoir 56. In the present embodiment, the oil level height of the first oil reservoir 50 is preferentially lowered, and the amount of lubricating oil and the like are set so as to be near the lower end of the diffring gear Gd as shown by the solid line in FIGS. The volume of the first oil reservoir 50, that is, the position of the first partition 48, the shape of the first partition 48, and the like are determined. Thus, if the oil level height of the 1st oil storage part 50 is reduced preferentially, stirring of the lubricating oil by rotation of the differential apparatus 32 will be suppressed, energy loss will be reduced, and fuel consumption will improve. Until the oil level is below the upper end position of the first partition wall 48, the lubricating oil is supplied both by scraping by the diff ring gear Gd and the like and at least by the suction by the first oil pump P1, and the oil level is promptly increased. Therefore, the energy loss due to the stirring of the lubricating oil due to the rotation of the differential device 32 is appropriately reduced.

  Further, by appropriately determining the position and shape of the partition walls 48 and 52, the suction performance of the oil pumps P1 and P2, and the like, the second oil storage portion 54 and the third oil storage portion 56 in which the suction ports 58 and 60 are disposed. The oil level in can be made higher than that of the first oil reservoir 50. Thus, air suction of the oil pumps P1 and P2 due to the suction ports 58 and 60 being exposed on the oil surface is suppressed, and the lubricating oil can be appropriately sucked and stably supplied. That is, the first oil reservoir 50 is divided by the first partition wall 48, so that a sufficient and sufficient amount of lubricating oil is secured on the second oil reservoir 54 and the third oil reservoir 56 side, and the differential device 32. By preferentially reducing the oil level height of the first oil reservoir 50 in which the oil is disposed, stirring of the lubricating oil due to the rotation of the differential device 32 can be suppressed and energy loss can be reduced.

  In the present embodiment, the second partition wall 52 is provided and is divided into a second oil reservoir 54 and a third oil reservoir 56 in the longitudinal direction of the vehicle, and each of the oil reservoirs 54 and 56 has a vehicle. Since the width dimension in the front-rear direction is short, the unevenness of the lubricating oil due to the change in the posture of the vehicle due to the road surface gradient, acceleration / deceleration, etc. is suppressed, and the fluctuation of the oil level is reduced. The air suction of the oil pumps P1 and P2 in which the suction ports 58 and 60 are arranged at 56 is further appropriately suppressed. Further, since the suction ports 58 and 60 are separately disposed in the second oil storage portion 54 and the third oil storage portion 56, the lubricating oil is sucked from both of these oil storage portions 54 and 56, and sufficient The amount of lubricating oil can be secured, and the suction performance of each oil pump P1, P2 can be individually set according to the required amount of oil supplied, the amount of oil returned to each oil reservoir 54, 56, etc. The oil level can be adjusted to prevent sucking. For example, for the first oil pump P1 that is driven to rotate according to the vehicle speed V during traveling, the suction performance is made lower than that of the second oil pump P2, and the reduction of the oil level is suppressed to prevent air suction. Can do.

  Although the height dimension of the 1st partition 48 and the 2nd partition 52 may be the same, the height dimension of the 2nd partition 52 is made higher than the 1st partition 48 in the present Example. As a result, when the vehicle starts, the lubricating oil is supplied by both the scraping by the differential ring gear Gd and the like and at least the suction by the first oil pump P1 to reduce the oil surface height, and when the oil level becomes lower than the upper end of the second partition wall 52, Since the inflow of lubricating oil from the third oil reservoir 56 to the second oil reservoir 54 is restricted, the subsequent decrease in the oil level in the second oil reservoir 54 and the first oil reservoir 50 is promoted. As a result, energy loss due to stirring accompanying the rotation of the differential device 32 is quickly reduced.

  The first supply path 42 is connected to the discharge side of the first oil pump P <b> 1 and supplies lubricating oil to each part of the power transmission device 12. Specifically, the lubricating oil is supplied to the bearings 62 and gears 64 (Ge, Gr1, Gr2, Gd, Gm, Gp, etc.) of each part of the power transmission device 12 and lubricated. Since the first oil pump P1 is connected to the differential device 32 and is driven to rotate, the first oil pump P1 is also rotated and driven as shown in FIG. Lubricating oil can be sucked in and supplied to each part. The differential device 32 is lubricated by scooping up the lubricating oil by the differential ring gear Gd or the like, but can be lubricated by supplying the lubricating oil from the first supply path 42. In addition, when there is a possibility that the first oil pump P1 sucks air, an oil storage can be provided as necessary for stable supply of lubricating oil.

  The second supply path 44 connected to the discharge side of the second oil pump P2 includes the input shaft 22, the planetary gear device 24, and the first motor generator located above the second oil reservoir 54 and the third oil reservoir 56. Lubricating oil is supplied to MG1 for lubrication and cooling. The second supply path 44 is provided with a heat exchanger 66, which cools the lubricating oil and supplies it to the first motor generator MG1 and the second motor generator MG2, thereby cooling them and overheating them. To prevent. The heat exchanger 66 is an oil cooler that cools the lubricating oil by heat exchange by air cooling or water cooling, for example. Since the engine 20 that rotationally drives the second oil pump P2 can be driven even when the vehicle is stopped, the lubricating oil is sucked in at an intake amount that does not depend on the vehicle speed V, including when the vehicle is stopped, and is supplied to the lubricating portion. However, in the EV traveling mode, as shown in FIG. 3, the operation of the second oil pump P2 is stopped when the rotation of the engine 20 is stopped.

  As described above, the lubricating device 40 of the hybrid vehicle 10 according to the present embodiment includes the first oil pump P1 that is mechanically driven to rotate by being connected to the differential device 32 that is the output unit. Even during EV travel in which the engine 20 is stopped due to free rotation of the generator MG1, the lubricating oil is drawn from the second oil reservoir 54 according to the vehicle speed V by the first oil pump P1, and the bearing 62, the gear 64, etc. Is supplied to the lubrication portion of the motor and properly lubricated. Even during EV travel, the sun gear 24s and the ring gear 24r of the planetary gear device 24 are idled, and the second motor generator MG2 is controlled in power running, so the planetary gear device 24 and the second motor generator MG2 On the other hand, the lubricating oil may be supplied from the first supply path 42.

  Further, the static oil level height Lst in a static state such as when the oil pumps P1 and P2 are stopped is higher than that of the first partition wall 48, and at least a part of the differential device 32 as an output unit is immersed in the lubricating oil. Therefore, when the vehicle starts, the lubricating oil is sprinkled up by the rotation of the differential ring gear Gd and the like, so that the lubricating oil is sprayed on each part of the power transmission device 12, and sufficient lubricating oil is supplied by the first oil pump P1. Good lubrication can be ensured even when starting difficult vehicles.

  On the other hand, when the vehicle is running, the oil level of the lubricating oil is lowered by at least suction by the first oil pump P1 and the scraping by the rotation of the diffring gear Gd and the like, and the oil level is the upper end of the first partition wall 48. In the following, the lubricating oil in the second oil reservoir 54 is sucked into the first oil pump P1, and the oil level height of the first oil reservoir 50 is further reduced by scooping up by rotation of the diff ring gear Gd and the like. The oil level in the first oil reservoir 50 is lower than the upper end position of the first partition wall 48 regardless of the return of the lubricating oil from the lubrication site, so that the stirring associated with the rotation of the differential device 32 is performed. Mechanical energy loss due to is reduced. In particular, until the oil level becomes lower than the upper end of the first partition wall 48, the oil level is lowered by both the suction by the first oil pump P1 and the rotation by the rotation of the diffring gear Gd, etc. The area of the differential device 32 immersed in oil is quickly reduced, and energy loss due to stirring is appropriately reduced.

  Further, since the suction port 58 of the first oil pump P1 is disposed in the second oil storage part 54 adjacent to the first oil storage part 50, the suction performance of the first oil pump P1 and the second oil storage part The oil level height during traveling of the vehicle can be adjusted separately from the first oil reservoir 50 by the range of 54, that is, the positions and shapes of the partition walls 48 and 52. As a result, the oil level of the second oil reservoir 54 can be adjusted so that air suction of the first oil pump P1 is suppressed, and insufficient supply of lubricating oil due to air suction can be prevented appropriately. Stable supply is possible.

  Further, since the second oil pump P2 that is rotationally driven by the engine 20 is provided separately from the first oil pump P1, the shortage of the lubricating oil supply amount can be compensated, and the lubricating oil supply independent of the vehicle speed V can be achieved. Each part can be lubricated in an amount. In addition, since the suction port 60 of the second oil pump P2 is disposed in the third oil reservoir 56, by setting the suction performance and the like so that the second oil pump P2 does not suck air, Sucking can be prevented and the lubricating oil can be supplied stably.

  In addition, the oil reservoir 46 is provided with a first partition 48 and a second partition 52, and is divided into a first oil reservoir 50, a second oil reservoir 54, and a third oil reservoir 56 from one end side in the vehicle front-rear direction. Therefore, the width dimension in the vehicle front-rear direction of each of the second oil storage portion 54 and the third oil storage portion 56 in which the suction ports 58 and 60 are disposed is shortened, and the posture change or adjustment of the vehicle due to a road surface gradient or the like. The unevenness of the lubricating oil due to the speed and the like is suppressed, the fluctuation of the oil level is reduced, and the air suction of the oil pumps P1 and P2 is further appropriately suppressed. Further, since the suction ports 58 and 60 are separately disposed in the second oil storage portion 54 and the third oil storage portion 56, the lubricating oil is sucked from both of these oil storage portions 54 and 56, and sufficient The amount of lubricating oil can be secured, and the suction performance of each oil pump P1, P2 can be individually set according to the required amount of oil supplied, the amount of oil returned to each oil reservoir 54, 56, etc. The oil level can be adjusted to prevent sucking.

  In addition, since the height dimension of the second partition wall 52 is higher than the height dimension of the first partition wall 48 and the suction port 58 of the first oil pump P1 is disposed in the second oil reservoir 54, the vehicle is started. When the oil surface height of the lubricating oil is lowered by scraping up due to the rotation of the differential ring gear Gd and the like and at least suctioned by the first oil pump P1 and becomes below the upper end of the second partition wall 52, the second oil reservoir 56 takes the second The inflow of lubricating oil to the oil reservoir 54 side is restricted. For this reason, the fall of the oil level height in the 2nd oil storage part 54 and the 1st oil storage part 50 after that is accelerated | stimulated, and the energy loss by stirring accompanying the rotation of the differential apparatus 32 is reduced rapidly.

  Moreover, since the oil pump which uses the engine 20 as a rotational drive source is used as the second oil pump P2, it is troublesome as compared with the case where an electric oil pump that is rotationally driven by an electric motor for the pump is employed. Control is unnecessary and it is advantageous in terms of cost.

  In addition, since the first supply path 42 and the second supply path 44 are configured independently of each other, a changeover valve or the like is not required, the structure can be simplified, and the required oil amount varies depending on the supply paths 42 and 44. The suction performances of the individual oil pumps P1 and P2 can be set separately, and unnecessary supply of lubricating oil can be suppressed. In addition, since the supply paths 42 and 44 are determined separately, a heat exchanger 66 such as an oil cooler can be individually provided, or an oil storage for storing lubricating oil can be provided. , 44 can properly set the lubrication performance and the like. That is, the first supply path 42 does not necessarily have to cool the lubricating oil, and the heat exchanger is omitted, so that the viscosity of the lubricating oil can be kept below a certain level, and loss due to the viscosity is reduced. Moreover, since the viscosity is low, the pressure resistance requirement of the first supply path 42 is relaxed.

  In addition, since the oil pumps P1 and P2 are provided with different suction ports 58 and 60 independently of each other through different suction oil passages, the suction amount and the supply paths 42 and 44 of the oil pumps P1 and P2, respectively. The arrangement of the suction ports 58 and 60 and the mesh can be individually set according to the lubrication site. For example, the strainer of the suction port 60 of the second oil pump P2 to which the lubricating oil is supplied via the heat exchanger 66 is desirably a fine mesh.

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

  In the lubricating device 100 of FIG. 6, the first oil pump P1 is connected to the differential device 32 via a pump connecting / disconnecting device 102 for connecting / disconnecting power transmission, and is connected to another rotating drive source 104 for rotational driving. This is the case. The pump connection / disconnection device 102 is a clutch, a one-way clutch, or the like, and is disposed between the first oil pump P1 and the pump drive gear Gp. For example, an electric motor for driving a pump is preferably used as the other rotational drive source 104, but it may be mechanically driven to rotate by the engine 20, in which case a clutch, a one-way clutch, etc. What is necessary is just to connect with the engine 20 via the 2nd pump connection / disconnection apparatus. In this case, the first oil pump P1 can be operated at a rotational speed that does not depend on the vehicle speed V, including when the vehicle is stopped, and the lubricating oil can be supplied from the first supply path 42 to the lubricating parts of the respective parts. it can.

  The lubricating device 100 is also rotationally driven by a predetermined rotational drive source 106 for the second oil pump P2. The rotational drive source 106 may be the engine 20 as in the case of the lubricating device 40, but it is also possible to newly provide an electric motor for driving the pump.

FIG. 7 is a diagram for explaining other travel modes that can be executed by the hybrid vehicle 10. In the free-run inertia travel mode, the fuel supply and the like of the engine 20 are stopped and the first motor generator MG1 and the second motor generator MG2 are stopped. These torques are all set to 0 so that free rotation is possible, and the engine 20 is stopped from rotating and coasting without engine brake. This free-run inertia running mode is executed in any of the EV running mode and the HV running mode, for example, when the accelerator is turned off when the depression operation of the accelerator pedal is released. In the deceleration eco-run traveling mode, the fuel supply and the like of the engine 20 are stopped and the torque of the first motor generator MG1 is set to 0 so that the engine 20 can be freely rotated. The engine 20 is stopped while the second motor generator MG2 is regeneratively controlled. Thus, braking torque is generated in the vehicle. This deceleration eco-run travel mode is executed in both the EV travel mode and the HV travel mode, for example, when the brake is decelerated when the brake pedal is depressed.

  In both the free-run inertia running mode and the deceleration eco-run running mode, the engine 20 is stopped in rotation, but the first oil pump P1 connected to the differential device 32 is driven to rotate in accordance with the vehicle speed V. 1 Each part of the power transmission device 12 is lubricated by the supply of lubricating oil from the oil pump P1. Further, the oil level of the first oil reservoir 50 is lowered by the suction of the lubricating oil by the first oil pump P1 and the scooping up by the rotation of the diffring gear Gd, etc., and by the stirring accompanying the rotation of the differential device 32, etc. The same effects as those of the above embodiments can be obtained, for example, energy loss can be suppressed. Specifically, in the free-run inertia running mode, the energy loss due to agitation is suppressed to increase the travel distance of inertial travel, and in the deceleration eco-run traveling mode, the energy loss due to agitation is suppressed to reduce the energy loss. The amount of power generated by the regenerative control of the two-motor generator MG2 increases.

The hybrid vehicle 300 of FIG. 8 is different from the hybrid vehicle 10 in the structure for mechanically driving the oil pumps P1 and P2. That is, the first oil pump P1 is rotationally driven via the pump drive gear Gp1 by the branch gear Go1 provided integrally with the ring gear 24r of the planetary gear device 24. The ring gear 24r is integrally provided with the engine output gear Ge via a connecting member 302, and is mechanically connected to the differential device 32 via a reduction large gear Gr1 and the like so as to be able to transmit power. The second oil pump P2 is rotationally driven via a pump drive gear Gp2 by a branch gear Go2 provided integrally with the carrier 24c of the planetary gear device 24. The carrier 24 c is integrally connected to the input shaft 22 and is mechanically driven to rotate as the engine 20 rotates. Therefore, in the hybrid vehicle 300, the with lubricating device 4 0 is preferably provided, by providing the pump disengaging device 102 and the rotation drive source 104 and 106, the use of lubricating apparatus 10 0 shown in FIG. 6 It is possible to obtain the same effect.

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

DESCRIPTION OF SYMBOLS 10,300: Hybrid vehicle (vehicle) 12: Power transmission device 14: Case 20: Engine (drive power source) 32: Differential device (output unit) 38: Drive wheel 40, 100 : Lubricator 4 6: Oil storage unit 48: First partition (partition) 50: First oil reservoir 52: Second partition (second partition) 5 4: Second oil reservoir 56: Third oil reservoir 58, 60: Suction port P1: First 1 Oil pump (suction device, oil pump) P2: Second oil pump (suction device, second oil pump) Lst: Oil level height at rest

Claims (2)

A power transmission device for a vehicle that is housed in a case and transmits a driving force from a driving force source to driving wheels via an output unit,
Lubricating oil in an oil storage part provided at the bottom of the case is sucked by a suction device and supplied to each part of the power transmission device, and the oil storage part is a first oil storage in a lower part of the output part by a partition wall. In the lubrication device divided into the parts and other parts,
The oil reservoir is provided with a second partition that further separates a portion other than the first oil reservoir, a second oil reservoir adjacent to the first oil reservoir, and the second oil reservoir A third oil reservoir is formed adjacent to
The suction device includes an oil pump that is mechanically driven to rotate with the rotation of the output unit and sucks the lubricating oil in the oil storage unit, and separately from the oil pump, the output unit A second oil pump that is rotationally driven by different rotational drive sources ;
The height of the partition wall and the second partition wall, both are set lower than quiescent oil level height of the lubricating oil in a static state where the flow is stopped for lubricating oils, and, of the output section The height position of the lower end is lower than the upper end position of the partition wall, and in the static state, at least a part of the output portion is immersed in the lubricating oil,
The inlets of the oil pump and the second oil pump are arranged separately for one and the other of the second oil reservoir and the third oil reservoir ,
When the vehicle travels, the lubricating oil in the first oil reservoir is scraped up with the rotation of the output unit, and at least one of the second oil reservoir and the third oil reservoir is removed by the oil pump. The lubricating device for a vehicle power transmission device according to claim 1, wherein the oil level of the first oil reservoir is lower than the upper end position of the partition wall by being sucked. The height dimension of the second partition is set higher than the height dimension of the partition,
2. The vehicle according to claim 1 , wherein an intake port of the oil pump is disposed in the second oil reservoir, and an intake port of the second oil pump is disposed in the third oil reservoir. Lubricating device for power transmission equipment.

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