JP2019152272A - Lubrication device of power transmission device for vehicle - Google Patents

Abstract

To secure a prescribed oil supply amount to a lubrication requiring region even when a vehicle has a low vehicle velocity and high load, in a case when an oil pump is connected to an output portion of a power transmission mechanism to be rotated and driven.SOLUTION: An oil 48 discharged from an oil pump P1 connected to a differential device 32 to be rotated and driven, is supplied to a lubrication requiring region (bearing 62 and gear 64) through a first supply oil passage 42 formed on the oil pipe 70, and the scattering oil 48s scraped up from an oil storage portion 46 by the differential device 32, is captured by receiving gutters 80, 82 disposed on the oil pipe 70 and supplied to the same lubrication requiring region. As the scattering oil 48s is supplied from the receiving gutters 80, 82 even in high load of a vehicle moving forward at low vehicle velocity, and high load in backing, in which the oil 48 may be insufficient only by the oil supply amount from the oil pump P1, the oil shortage can be suppressed.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lubricating device for a power transmission device for a vehicle, and in particular, when an oil pump is connected to an output portion of a power transmission mechanism and is driven to rotate, the lubrication performance of the vehicle at low vehicle speed and high load is improved. It is about technology.

A power transmission mechanism is provided in a power transmission device for a vehicle housed in a case, and oil in an oil reservoir provided at the bottom of the case is sucked by an oil pump and supplied to a portion requiring lubrication in the case. A lubricating device for a vehicle power transmission device has been proposed (see Patent Document 1). Patent Document 2 describes a technique for supplying oil discharged from the oil pump to the portion requiring lubrication via an oil pipe separate from the case.
“Lubrication” in this specification includes not only the prevention of friction and wear but also the case of cooling by supplying lubricating oil.

JP 2011-27142 A JP-A-6-288465 JP 2012-106599 A

  By the way, it is conceivable to provide the oil pump so as to be mechanically driven to rotate by being connected to an output portion that rotates in conjunction with drive wheels in the power transmission mechanism (see, for example, Patent Document 3). In that case, when the vehicle is at a low vehicle speed and a high load, the required amount of oil to be supplied to the power transmission mechanism is relatively large, whereas the rotation speed of the oil pump is low and sufficient discharge pressure cannot be obtained. The oil supply could be insufficient.

  The present invention has been made against the background of the above circumstances. The object of the present invention is to provide a vehicle with a low vehicle speed and a high load when the oil pump is connected to the output portion of the power transmission mechanism and driven to rotate. It is to be able to secure a predetermined oil supply amount for a portion requiring lubrication even at times.

  In order to achieve such an object, the present invention provides a power transmission device for a vehicle in which a power transmission mechanism is housed in a case, and oil in an oil reservoir provided at the bottom of the case is supplied by an oil pump. In a lubricating device of a vehicle power transmission device that inhales and supplies to a portion requiring lubrication in the case, (a) the oil pump is connected to an output portion that rotates in conjunction with drive wheels in the power transmission mechanism. The oil is mechanically rotated, and is configured to supply oil to the portion requiring lubrication via an oil pipe separate from the case disposed in the case, and (b) The power transmission mechanism includes a scooping transmission mechanism portion that is at least partially immersed in the oil in the oil storage portion and scoops up the oil, and (c) the oil pipe is discharged from the oil pump. An internal passage for supplying the oil to the lubrication-required portion, and the oil that has been scooped up from the oil reservoir by the scooping transmission mechanism, and the same lubrication as the oil supply portion by the internal passage It is characterized by having a receiving bowl-shaped external passage provided outside the internal passage along the internal passage so as to lead to a necessary part.

  In such a lubricating device for a vehicle power transmission device, the oil discharged from an oil pump connected to the output portion of the power transmission mechanism and driven to rotate needs to be lubricated through an internal passage provided in the oil pipe. In addition to being supplied to the part, the oil scooped up from the oil storage part by the scooping transmission mechanism part is captured by a receiving rod-shaped external passage provided in the oil pipe and supplied to the same lubrication required part. For this reason, there is a possibility of oil shortage only with the amount of oil supplied from the oil pump. Even when the vehicle speed is low and the load is high, oil shortage is suppressed by supplying oil from the external passage, and lubrication performance is improved. . In particular, at low vehicle speeds, the amount of oil in the oil reservoir is increased and the oil level is increased by the amount of oil sucked by the oil pump, so that the amount of oil picked up increases and the amount of oil supplied from the external passage increases. Therefore, the oil shortage can be suppressed appropriately.

  On the other hand, since it is only necessary to provide a catch-like external passage along the internal passage on the oil pipe constructed separately from the case, compared to a case where a catch tank or the like for catching scattered oil is provided separately. In addition to being able to be arranged compactly in a limited space, no significant design change is required, the number of mounting steps is not increased, and the invention can be implemented easily and inexpensively.

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. FIG. 2 is a hydraulic circuit diagram illustrating a lubrication device provided in the hybrid vehicle of FIG. 1. It is the schematic perspective view which showed independently the oil pipe of the lubricating device of FIG. It is the perspective view which expanded and showed the IV section in FIG. It is the figure which illustrated the relationship between the maximum required oil amount with respect to a vehicle speed, and the oil supply amount by the oil pump which changes in proportion to a vehicle speed. It is a skeleton diagram explaining another example of the power transmission device for vehicles to which the present invention can be applied.

  The present invention is for various vehicles such as an engine-driven vehicle, a hybrid vehicle having an electric motor for traveling in addition to an engine as a driving force source for traveling, or an electric vehicle having only an electric motor as a driving force source. It can be applied to the power transmission device. The power transmission device may be a horizontal transaxle such as an FF (front engine / front drive) in which a plurality of shafts are arranged along the vehicle width direction, an FR (front engine / rear drive) type, or 4 A wheel drive type power transmission device may be used. The scraping transmission mechanism unit is a power transmission mechanism unit that is disposed at a relatively low position and is at least partially immersed in the oil storage unit. For example, a bevel gear type differential device is suitable, but a planetary gear type differential unit is suitable. Another power transmission mechanism such as a device may be used.

  The present invention can be applied to, for example, a vehicle capable of interrupting power transmission between a driving force source and a driving wheel and capable of traveling while the driving force source is stopped rotating, and the driving force source stops rotating. Even when the vehicle is running, the oil can be supplied from the oil pump to the portion requiring lubrication when the vehicle is running. The present invention can also be applied to an electric vehicle or the like in which a driving force source and driving wheels are always rotating in conjunction with each other. For example, when the output unit that rotates in conjunction with the drive wheel includes a connecting / disconnecting device that can cut off power transmission, the output unit is a portion closer to the driving wheel than the connecting / disconnecting device. A differential device that distributes the driving force transmitted from the motor to the left and right driving wheels, an intermediate shaft that transmits the driving force to the differential device, and the like. The connecting / disconnecting device is, for example, a transmission capable of being neutral, a forward / reverse switching device, an electric differential unit, or the like. In the case of an electric vehicle in which an electric motor as a driving force source is directly connected to driving wheels via a gear mechanism, a differential device, or the like, the entire power transmission mechanism is an output unit that rotates in conjunction with the driving wheels.

  The lubricating device may include only an oil pump connected to the output unit and driven to rotate. However, the lubricating device may be connected to a driving force source such as an engine and driven to rotate, or at any time. An electric oil pump or the like that can be operated with an arbitrary discharge amount may be additionally provided. The lubrication-required parts to which oil is supplied from the oil pump include gear meshing parts and transmission belts that transmit power, bearings that rotatably support the rotating shaft of the power transmission mechanism, hybrid type automobiles, Parts that are not immersed in the oil reservoir, such as friction parts and heat generation parts that require lubrication or cooling during power transmission, such as electric motors and generators of electric vehicles such as electric vehicles, are suitable. Although oil can be directly supplied from the oil pump to the site requiring lubrication, an oil cooler, an oil passage switching valve, a hydraulic control valve, or the like may be interposed between the oil pump and the site requiring lubrication.

  The external passage provided in the oil pipe is desirably provided so as to incline downward toward the tip side where the oil flows out toward the lubrication-required part in order to quickly guide the received oil to the lubrication-required part. It may be provided in a substantially horizontal direction. The oil pipe in the portion where the external passage is provided is preferably substantially parallel to the external passage. However, since oil is supplied from the oil pump, the oil pipe may be substantially horizontal or inclined upward or downward. May be.

  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 transaxle 12 of a hybrid vehicle 10 to which the present invention is applied. A plurality of axes constituting a power transmission mechanism 16 of the transaxle 12 are located in a common plane. FIG. The transaxle 12 transmits the output of the engine 20 as a driving force source to the left and right driving wheels 38, and an FF vehicle in which a plurality of shafts of the gear-type power transmission mechanism 16 are arranged along the vehicle width direction. The power transmission mechanism 16 is housed in the case 14. The engine 20 is an internal combustion engine such as a gasoline engine or a diesel engine that generates power by burning fuel. The transaxle 12 corresponds to a power transmission device, and the case 14 includes a plurality of members as necessary.

  The power transmission mechanism 16 includes a first axis S1 to a fourth axis S4 substantially parallel to the vehicle width direction. On the first axis S1, an input shaft 22 connected to the engine 20 as a driving force source is provided. 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, whereby the power transmission between the engine 20 and the power transmission mechanism 16 is interrupted, and the engine 20 is prevented from being rotated.

  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 used alternatively as an electric motor and a generator, and is used as a driving force source for driving 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. 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. The fourth axis S4 is defined at the lowest position (low position) in the vehicle among the first axes S1 to S4, and at least a part of the differential device 32 is an oil reservoir provided at the bottom of the case 14 46 (see FIG. 2), the oil 48 in the oil reservoir 46 is scraped up as the differential device 32 rotates. The differential device 32 corresponds to a scraping transmission mechanism unit.

  In such a hybrid vehicle 10, an EV (Electric Vehicle) travel mode and an HV (Hybrid Vehicle) travel mode can be executed. For example, the required driving force (accelerator operation amount, etc.) and the vehicle speed V are determined as parameters. The EV driving mode and the HV driving mode are switched according to the mode switching map. The EV travel mode is a mode in which the second motor generator MG2 is used as a driving force source by controlling the power running with the engine 20 stopped. For example, the EV traveling mode is selected in a low demand driving 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, for example, in a region where the required driving force (high load) is higher than that in the EV traveling mode. The 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 transaxle 12 of the hybrid type automobile 10 is merely an example, and a double pinion type planetary gear unit is adopted as the planetary gear unit 24, a configuration using a plurality of planetary gear units, 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 transaxle 12 of the hybrid vehicle 10 of this 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 oil passages 42 and second supply oil passages 44, respectively. Each part is shared and lubricated. 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 oil 48 from the oil reservoir 46 provided at the bottom of the case 14 and output it to the supply oil passages 42 and 44. The oil reservoir 46 is constituted by the case 14 itself, and is provided including the lower position of the differential device 32.

  The first oil pump P1 is an oil pump that is connected to a differential device 32, which is an output unit, and is rotationally driven. The first supply oil passage 42 connected to the discharge side of the first oil pump P1 has power transmission. Oil 48 is supplied to the portions of the mechanism 16 that require lubrication. The lubrication-needed parts are, for example, bearings 62 and gears 64 (Ge, Gr1, Gr2, Gd, Gm, or Gp) of each part of the power transmission mechanism 16. 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 driven to rotate in the EV traveling mode in which the rotation of the engine 20 is stopped. Oil 48 can be supplied to the tank. The differential device 32 is lubricated by scooping up the oil 48 by the differential ring gear Gd or the like, but can also be lubricated by supplying the oil 48 from the first supply oil passage 42. In addition, an oil storage may be provided as necessary for a stable supply of the oil 48, such as when the first oil pump P1 may suck air.

  The first supply oil passage 42 is an internal passage provided inside the oil pipe 70 shown in FIG. The oil pipe 70 is configured separately from the case 14, and the plurality of attachment portions 72 are fixed to the inner surface of the case 14 or the outer surface of the case of the first oil pump P1 by fastening bolts 74, respectively. 14 at a predetermined position. The oil pipe 70 includes a branch nozzle portion 76 that supplies the oil 48 to the bearing 62 and a branch nozzle portion 78 that supplies the oil 48 to the gear 64. The oil pipe 70 has a hollow structure bent three-dimensionally as a whole. For example, it is configured by joining the branch nozzle portions 76, 78 and the like to a pipe member such as a metal bent into a three-dimensional shape. Part or all of the oil pipe 70 can be made of a material other than metal, such as a synthetic resin material. The branch nozzle portions 76 and 78 are provided so as to protrude in a substantially horizontal direction. The oil pipe 70 is provided with a branch nozzle portion in addition to the branch nozzle portions 76 and 78 so as to supply the oil 48 to other portions requiring lubrication.

  Here, since the first oil pump P1 is connected to the differential device 32 and is driven to rotate, the oil supply amount increases in proportion to the vehicle speed V during forward travel, as indicated by a broken line in FIG. It is substantially zero during reverse travel. On the other hand, the maximum required oil amount at the lubrication required portion of the bearing 62 and the gear 64 is determined according to the vehicle speed V and the maximum transmission torque (maximum load), and changes as shown by a solid line in FIG. There is a possibility that the amount of oil 48 indicated by hatching in FIG. 5 will be insufficient when the forward load is low and the vehicle speed is high and P1 is low.

  On the other hand, in the present embodiment, the branch nozzle portions 76 and 78 of the oil pipe 70 are provided with receiving rods 80 and 82 having a U-shaped cross section that open upward, respectively. A part of oil (hereinafter referred to as scattered oil) 48 s scooped up from 46 is captured by the receiving rods 80 and 82 and guided to the bearing 62 and the gear 64. FIG. 4 is an enlarged perspective view of a receiving rod 82 provided in the IV portion in FIG. 3, that is, the branch nozzle portion 78. It is provided on the outer upper surface portion of the branch nozzle portion 78 substantially parallel to the first supply oil passage 42 in the portion 78. The branch nozzle portion 78 and the receiving rod 82 are provided so as to protrude in a substantially horizontal direction, and the scattered oil 48s received by the receiving rod 82 flows through the receiving rod 82 to the tip side of the branch nozzle portion 78. Then, it flows downward from the opening on the tip side and is supplied to the gear 64. The first supply oil passage 42 is inserted into the branch nozzle portion 78 and reaches the vicinity of the tip of the branch nozzle portion 78, and the oil 48 supplied through the first supply oil passage 42 is supplied from the branch nozzle portion 78. It is discharged downward from a discharge port (not shown) provided on the lower surface of the tip of the portion 78 and supplied to the gear 64 in the same manner as the scattered oil 48s. The receiving rod 82 can be configured integrally with the branch nozzle portion 78 using, for example, a synthetic resin, but may be configured separately from the branch nozzle portion 78 and fixed with an adhesive or the like. The other branch nozzle portion 76 and the receiving rod 80 are configured similarly to the branch nozzle portion 78 and the receiving rod 82. Receiving rods 80 and 82 correspond to external passages.

  According to the lubrication device 40 of the transaxle 12 of this embodiment, the oil 48 discharged from the first oil pump P1 connected to the differential device 32 of the power transmission mechanism 16 and driven to rotate is supplied to the oil pipe 70. The scattered oil 48 s that is supplied through the first supply oil passage 42 provided to the portion requiring lubrication (the bearing 62 and the gear 64) and scraped up from the oil reservoir 46 by the differential device 32 is supplied to the oil pipe 70. Are received by the receiving rods 80 and 82 provided on the same and supplied to the same lubrication-needed portion. As a result, the oil 48 s is supplied from the receiving rods 80 and 82 even when the vehicle is running at a low forward speed or a high load when the vehicle is running low, because the oil 48 may be insufficient only by the amount of oil supplied from the first oil pump P1. As a result, oil shortage is suppressed and lubrication performance is improved. In particular, when the vehicle speed is low, the amount of oil in the oil reservoir 46 is increased and the oil level is increased by the amount of oil sucked by the first oil pump P1, so that the amount of oil 48 that is scooped up increases. , 82, the supply amount of the scattered oil 48s is increased, and the oil shortage in the lubrication required portion can be appropriately suppressed.

  On the other hand, it is only necessary to provide the receiving pipes 80 and 82 along the branch nozzle portions 76 and 78 provided with the first supply oil passage 42 in the oil pipe 70 configured separately from the case 14. Compared to the case where a catch tank or the like that catches 48s is provided separately, it can be arranged compactly in a limited space, does not require a significant design change, does not increase the number of installation steps, and can be implemented simply and inexpensively. it can.

  In this embodiment, the branch nozzle portions 76 and 78 are provided so as to protrude in a substantially horizontal direction. However, the branch nozzle portions 76 and 78 may be provided so as to be inclined downward toward the distal end side. If the receiving rods 80 and 82 are provided so as to incline downward toward the front end side in parallel with the branch nozzle portions 76 and 78, the scattered oil 48s can quickly flow toward the front end side. Only the receiving rods 80 and 82 may be provided so as to be inclined downward toward the distal end side.

  In addition, a receiving rod 80 or 82 may be provided on either one of the branch nozzle portions 76 and 78, or a part of the main body portion of the oil pipe 70 may directly discharge the oil 48 toward the lubrication required portion. In such a case, various modes are possible, such as providing a receiving hook on the main body portion. Lubricating apparatus 40 may be configured to supply oil 48 and scattered oil 48s to motor generators MG1 and MG2 for cooling in place of or in addition to bearing 62 and gear 64.

  In the above embodiment, the lubrication device 40 provided on the transaxle 12 of the hybrid vehicle 10 has been described. However, as shown in FIG. 6, the transaxle of the electric vehicle 90 provided with a motor generator MG as a driving force source. The present invention can also be applied to a lubricating device provided at 92. The transaxle 92 amplifies the torque of the motor generator MG by the reduction gear device 30 and transmits it to the differential device 32, and distributes it to the left and right drive wheels 38 together with the motor generator MG in a case 96. Is housed inside. That is, the transaxle 12 is such that the motor generator MG, which is a driving force source, and the driving wheels 38 always rotate in conjunction with each other. The lubrication device for the transaxle 92 includes a first oil pump P1 that is connected to a differential device 32 that is an output unit and is driven to rotate. For example, as in the lubrication device 40 of FIG. The oil pipe 70 and the receiving rods 80 and 82 provided on the oil pipe 70 are provided, and the oil 48 and the scattered oil 48s are applied to the lubrication-necessary parts such as bearings and gears of the power transmission mechanism 94. Supplied. Also in this case, the same function and effect as the lubricating device 40 of the above-described embodiment can be obtained in the lubrication performance for the lubrication-needed portion. In addition, since the motor generator MG that is a driving force source and the driving wheel 38 always rotate in conjunction with each other, the entire power transmission mechanism 94 can be regarded as an output unit.

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

  10: Hybrid type automobile (vehicle) 12, 92: Transaxle (power transmission device) 14, 96: Case 16, 94: Power transmission mechanism 32: Differential device (output unit, scraping transmission mechanism unit) 38: Drive wheel 40 : Lubricating device 42: First supply oil passage (internal passage) 46: Oil reservoir 48: Oil 48 s: Spattered oil (oil) 62: Bearing (portion requiring lubrication) 64: Gear (portion requiring lubrication) 70: Oil pipe 80 , 82: Receptor (external passage) 90: Electric vehicle (vehicle) P1: First oil pump (oil pump)

Claims (1)

A power transmission mechanism is provided in a power transmission device for a vehicle accommodated in a case, and oil in an oil reservoir provided in the bottom of the case is sucked by an oil pump and supplied to a portion requiring lubrication in the case In a lubricating device for a vehicle power transmission device,
The oil pump is mechanically driven to rotate by being coupled to an output portion that rotates in conjunction with drive wheels in the power transmission mechanism, and is separate from the case disposed in the case. Oil is supplied to the necessary lubrication site through an oil pipe,
The power transmission mechanism includes a scooping transmission mechanism portion that is at least partially immersed in the oil in the oil storage portion and scoops up the oil,
The oil pipe captures the oil that has been pumped up from the oil reservoir by the scraping transmission mechanism by supplying the oil discharged from the oil pump to the lubrication-required part, and the internal pipe And a receiving rod-shaped external passage provided outside the internal passage along the internal passage so as to lead to the same lubrication required portion as the oil supply portion. Lubricating device for power transmission equipment.

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