JP2012072876A - Oil supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an oil supply device which can reduce power loss which accompanies cooling of an oil.SOLUTION: The oil supply device includes an oil receiving part 8 which is arranged in a power transmission device 1 of a vehicle, contains an oil flow inlet 8b, and supplies the oil that has flowed into a supply object part; a reservoir part 9 which is formed in the power transmission device to store the oil; a gear 7 which is arranged in the power transmission device and sends out the oil in the reservoir part from it by rotating; guiding paths 13, 14, and 23 which guide the oil sent out by the gear to the oil receiving part; and a heat exchanger 12 which performs heat exchange between the cooling medium supplied from the outside and the oil in the guiding path 23.

Description

  The present invention relates to an oil supply device.

  Conventionally, a technique for cooling oil in a power transmission device or the like is known. In Patent Document 1, a transaxle case in which components to be lubricated with lubricating oil are housed and an internal space of the transaxle case are partitioned to define first and second rooms, and between the first and second rooms Cooling oil for a power transmission mechanism comprising: a partition wall that allows the movement of the lubricating oil; and a circulation device that takes out the lubricating oil from the second chamber and cools it, and supplies the cooled lubricating oil to the first chamber Device technology is disclosed.

JP 2006-292071 A

  When an oil pump is used for cooling the oil, power loss associated with driving the oil pump becomes a problem. In addition, there is a problem that the installation of an oil pump or an oil cooler leads to an increase in cost. It is desired to be able to reduce power loss associated with oil cooling and to reduce costs related to oil cooling.

  The objective of this invention is providing the oil supply apparatus which can reduce the power loss accompanying cooling of oil.

  Another object of the present invention is to provide an oil supply apparatus capable of reducing the cost related to oil cooling.

  An oil supply device according to the present invention is disposed in a power transmission device of a vehicle, has an oil inlet, and is formed in the power transmission device and an oil receiving portion that supplies inflowing oil to a supplied portion. A storage part that stores oil, a gear that is arranged in the power transmission device and rotates to feed oil in the storage part from the storage part, and guides the oil sent out by the gear to the oil receiving part And a heat exchanger for exchanging heat between the cooling medium supplied from the outside and the oil in the induction path.

  In the oil supply apparatus, the heat exchanger preferably includes a wall member that forms the guide path, and a flow path of the cooling medium that is formed on the opposite side of the guide path side with the wall member interposed therebetween. .

  In the oil supply apparatus, the heat exchanger includes an outer tube and an inner tube disposed inside the outer tube and spaced from the outer tube, and the inside of the inner tube is the guide path. The space between the inner tube and the outer tube is preferably a flow path for the cooling medium.

  In the oil supply device, in the guide passage, on the upstream side of the downstream end of the heat exchanger in the oil flow direction, a downstream channel cut-off with respect to the upstream channel cross-sectional area in the flow direction is performed. It is preferable that an area changing portion having a small area is provided.

  In the oil supply apparatus, the vehicle includes a motor generator that can function as a power source for traveling, a battery, a power control unit that connects the battery and the motor generator, and a cooling system that cools the power control unit. It is preferable that the cooling means and the circulating means for the cooling medium are shared with the cooling system.

  An oil supply apparatus according to the present invention includes a guide path that guides oil sent from a storage section by a gear to an oil receiving section, a heat exchanger that performs heat exchange between an externally supplied cooling medium and oil in the guide path. Is provided. According to the oil supply device of the present invention, since an oil pump that sends oil to the outside for cooling the oil is not necessary, there is an effect that it is possible to reduce power loss due to oil cooling. Moreover, according to the oil supply apparatus concerning this invention, since it is not necessary to provide a dedicated oil cooler outside, there exists an effect that the cost regarding oil cooling can be reduced.

FIG. 1 is a diagram illustrating a power transmission device including the oil supply device according to the embodiment. FIG. 2 is a perspective view showing the first guide member. FIG. 3 is a perspective view showing the second guide member. FIG. 4 is a cross-sectional view of the second guide member.

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

(Embodiment)
The embodiment will be described with reference to FIGS. 1 to 4. The present embodiment relates to an oil supply apparatus. Drawing 1 is a figure showing the power transmission device provided with the oil supply device concerning an embodiment.

  Conventionally, in oil cooling of a power transmission device in an AT (automatic transmission) or a hybrid vehicle, an oil cooler that uses oil pressure of an oil pump to exchange heat with engine cooling water or inverter cooling water may be used. Such oil coolers have problems such as high cost and increased loss due to oil pumps. For example, the oil cooler main body needs to be brazed, and oil and water pipes need to be provided, which makes the oil cooler expensive. Further, in the oil cooler, the oil flow path is narrowed in order to increase the flow rate of oil at the heat exchange site with water, leading to an increase in loss due to the oil pump.

  Further, when the oil pump is driven by the rotation of the engine, there is a problem that the oil cooler stops its function by stopping the oil pump during EV traveling of the hybrid vehicle.

  The oil supply apparatus 1-1 of the present embodiment includes a second induction member 12 having a function as a heat exchanger that performs heat exchange between the oil sent by the rotation of the diff ring gear 7 and the cooling water. The second guide member 12 includes a guide path 23 that guides oil sent out by the diff ring gear 7 to the oil receiving portion 8. The second guide member 12 includes oil in the guide path 23 and cooling water (cooling medium) supplied from the outside. Perform heat exchange. According to the oil supply device 1-1 of the present embodiment, an oil pump for sending oil to the oil cooler becomes unnecessary, and power loss accompanying oil cooling can be reduced. In addition, the oil cooler and the oil pump can be omitted, and the cost for cooling the oil can be reduced.

  The second guide member 12 not only cools the oil, but also guides the oil sent by the diff ring gear 7 to the oil receiving portion 8. Thereby, the supply efficiency with which the diff ring gear 7 supplies oil to the oil receiving portion 8 can be increased.

  In FIG. 1, the code | symbol 1 shows the power transmission device of a hybrid vehicle (not shown). The hybrid vehicle is an FF (front engine / front drive) type vehicle, and each axis of the power transmission device 1 extends in the vehicle width direction. Moreover, the code | symbol 1-1 shows the oil supply apparatus of this embodiment. The oil supply device 1-1 of the present embodiment includes an oil receiving portion 8, a storage portion 9, a diff ring gear 7, guide paths 13, 14, and 23, and a second guide member 12.

  The power transmission device 1 has a case 2. In the case 2, a counter drive gear 3, a counter driven gear 4, a drive pinion gear 5, an MG2 reduction gear 6, a diff ring gear (gear) 7, an oil receiving portion 8, and a storage portion 9 are provided. The counter drive gear 3 is disposed on the front side in the vehicle front-rear direction with respect to the counter driven gear 4, and the MG2 reduction gear 6 and the diff ring gear 7 are disposed on the rear side in the vehicle front-rear direction with respect to the counter driven gear 4.

  The counter drive gear 3 is connected to the output shaft of the engine (not shown) and the rotation shaft of the first motor generator MG1 via a planetary gear mechanism, and the engine output is the counter drive gear 3 and the first motor generator MG1. Are divided and input. The counter driven gear 4 and the drive pinion gear 5 are arranged on the same axis and rotate integrally. The counter driven gear 4 meshes with the counter drive gear 3. MG2 reduction gear 6 is coupled to the rotation shaft of the rotor of second motor generator MG2.

  The first motor generator MG1 and the second motor generator MG2 have a function (power running function) as an electric motor driven by supply of electric power and a function (regeneration function) as a generator that converts mechanical energy into electric energy. Have both. That is, the first motor generator MG1 and the second motor generator MG2 can function as a power source for the vehicle. As the first motor generator MG1 and the second motor generator MG2, for example, an AC synchronous motor generator can be used. The vehicle is equipped with a battery 25 that can transmit and receive electric power to and from the first motor generator MG1 and the second motor generator MG2. First motor generator MG 1 and second motor generator MG 2 are connected to battery 25 via power control unit 24.

  The power control unit 24 includes an inverter, a converter, and the like, and controls power transfer between the battery 25 and the motor generators MG1 and MG2. The inverter performs conversion between the high voltage direct current and the alternating current of motor generators MG1 and MG2. The converter performs voltage transformation between the battery 25 and the inverter. The converter can boost the voltage of the battery 25 and input it to the inverter, and can step down the high-voltage direct current input from the inverter and charge the battery 25.

  The MG2 reduction gear 6 meshes with the counter driven gear 4. The MG2 reduction gear 6 has a smaller diameter than the counter driven gear 4, and the output of the second motor generator MG2 is amplified and transmitted from the MG2 reduction gear 6 to the counter driven gear 4.

  The drive pinion gear 5 meshes with the diff ring gear 7, and the engine output torque input to the counter driven gear 4 and the output torque of the second motor generator MG 2 are transmitted to the diff ring gear 7 via the drive pinion gear 5. Communicated. The diff ring gear 7 is connected to the drive wheel via a differential mechanism, and rotates in conjunction with the rotation of the drive wheel. That is, the diff ring gear 7 is a gear that rotates in conjunction with the rotation of the vehicle wheel. An arrow Y1 indicates the direction of rotation of the diff ring gear 7 when the vehicle moves forward.

  The rotation axis 3 a of the counter drive gear 3 is located in front of the rotation axis 4 a of the counter driven gear 4 in the vehicle front-rear direction. The rotation axis 6a of the MG2 reduction gear 6 and the rotation axis 7a of the diffring gear 7 are located behind the rotation axis 4a of the counter driven gear 4 in the vehicle longitudinal direction.

  The rotation axis 7a of the diff ring gear 7 is positioned below the rotation axis 3a, 4a, 6a of the counter drive gear 3, the counter driven gear 4 and the MG2 reduction gear 6 in the vertical direction. That is, the diff ring gear 7 is disposed in the lower portion of the case 2 in the vertical direction. Further, the rotation axis 6 a of the MG2 reduction gear 6 is positioned above the rotation axes 3 a, 4 a, 7 a of the counter drive gear 3, the counter driven gear 4 and the diff ring gear 7 in the vertical direction. That is, the MG2 reduction gear 6 is disposed in the upper part of the case 2 in the vertical direction. The MG2 reduction gear 6 is disposed above the diff ring gear 7 in the vertical direction.

  A storage portion 9 in which lubricating oil (for example, ATF) is stored is formed in the lower portion of the case 2 in the vertical direction. In the present embodiment, the lubricating oil is also referred to as “oil”. The storage portion 9 is formed by the inner wall surface of the case 2 facing each other with the bottom surface 2a of the case 2 and the diffring gear 7 sandwiched in the axial direction. In the following description, unless otherwise specified, the “axial direction” indicates the axial direction of the diffring gear 7, and the “circumferential direction” indicates the rotational direction around the rotational axis 7 a of the diffring gear 7.

  An oil receiving portion 8 is provided in the case 2 above the diff ring gear 7 in the vertical direction. The oil receiving portion 8 is partitioned from a lower space in the case 2 by a rib 8a extending in the vehicle front-rear direction, and can store oil. The rib 8a is formed above the counter drive gear 3 and the MG2 reduction gear 6 in the vertical direction. The oil receiving portion 8 has an oil inlet 8b. The inflow port 8b is formed at the rear end of the oil receiving portion 8 in the vehicle front-rear direction. Oil receiving portion 8 supplies oil flowing in through inflow port 8b to each portion (supplied portion) of power transmission device 1 such as first motor generator MG1 and second motor generator MG2.

  The diff ring gear 7 is disposed in the lower part of the case 2, and when oil is stored in the storage portion 9, a part of the def ring gear 7 is immersed in the stored oil. When the vehicle moves forward, the diff ring gear 7 rotates in the rotation direction indicated by the arrow Y1. The oil in the reservoir 9 is sent in the rotational direction Y1 by the rotation of the diff ring gear 7. The oil supply apparatus 1-1 according to the present embodiment includes guide paths 13, 14, and 23 that guide oil sent out by the diff ring gear 7 to the oil receiving portion 8. The guide paths 13, 14, and 23 are formed by the first guide member 11 disposed on the outer peripheral portion of the diff ring gear 7 and the second guide member 12 disposed on the upper side in the vertical direction of the first guide member 11. Arrows Y2 and Y3 indicate the direction of oil flow in the guide paths 13, 14, and 23.

  The first guide member 11 guides the oil that is sent by the rotation of the diff ring gear 7 and flows in the rotation direction Y <b> 1 through the outer periphery of the diff ring gear 7 to the cooling portion guide path 23 of the second guide member 12. The first guide member 11 is disposed so as to cover the outer peripheral portion of the diff ring gear 7. The first guide member 11 extends in the rotation direction Y1 from the vicinity of the lower end of the diff ring gear 7 to the vicinity of the upper end. The first guide member 11 includes a side wall portion 11a, a curved surface portion 11b, and a duct portion 11c. The side wall portion 11a is a plate-like member that faces the side surface of the diff ring gear 7 in the axial direction. The side wall portions 11 a are disposed on both sides in the axial direction with respect to the differential ring gear 7.

  The curved surface portion 11b faces the outer peripheral surface 7b of the diff ring gear 7 in the radial direction. The curved surface portion 11b has an arc shape when viewed in the axial direction. A circumferential guide path 13 is formed between the outer periphery of the diff ring gear 7 and the first guide member 11. The circumferential guide path 13 is an oil path that extends in the circumferential direction of the diffring gear 7 along the outer periphery of the diffring gear 7. The oil sent from the storage part 9 by the diff ring gear 7 is guided to the side wall part 11a and the curved surface part 11b and flows in the circumferential guide path 13 from the lower side to the upper side in the vertical direction. The first guide member 11 can suppress the oil sent by the diff ring gear 7 from escaping in the radial direction and the circumferential direction, and can concentrate the oil on the tooth tip of the diff ring gear 7.

  The duct part 11c is connected to the outer peripheral surface of the curved surface part 11b. The duct portion 11c extends from the curved surface portion 11b toward the upper side in the vertical direction. FIG. 2 is a perspective view showing the first guide member 11. As shown in FIG. 2, the duct portion 11c is formed in a cylindrical shape having a rectangular cross section. A duct portion guide path 14 is formed inside the duct portion 11c. An opening portion 11d is formed in the curved surface portion 11b, and the duct portion guide passage 14 communicates with the circumferential guide passage 13 through the opening portion 11d. The duct portion guide path 14 extends in the tangential direction of the portion of the outer peripheral surface 7b of the diff ring gear 7 that faces the opening 11d. As a result, the oil that is sent to the diff ring gear 7 and flows through the circumferential guide path 13 flows into the duct section guide path 14 by the circumferential force received from the diff ring gear 7. In other words, the circumferential guide path 13 and the duct section guide path 14 are connected so that oil can flow into the duct section guide path 14 from the circumferential guide path 13 without impairing the energy of the oil flow.

  Returning to FIG. 1, the second guide member 12 connects the duct portion 11 c and the inlet 8 b of the oil receiving portion 8. The second guide member 12 extends in the vertical direction, and the lower end thereof is connected to the upper end of the duct portion 11c. Moreover, the upper end of the 2nd guide member 12 is connected to the inflow port 8b. The upper end of the second guide member 12 is in the same position as the inlet 8b in the vertical direction, and the oil flowing out from the cooling section guide passage 23 can flow into the oil receiving part 8 through the inlet 8b. FIG. 3 is a perspective view showing the second guide member 12, and FIG. 4 is a cross-sectional view of the second guide member 12. FIG. 4 shows an AA cross section of FIG.

  As shown in FIGS. 3 and 4, the second induction member 12 functions as a heat exchanger. The second guide member 12 includes an outer tube 15, an inner tube 16, a partition member 17, a lid 18, a bottom plate 19, and an oil cooling cooling water pipe 20.

  The outer tube 15 and the inner tube 16 are each formed in a cylindrical shape having a rectangular cross section. The inner tube 16 is disposed inside the outer tube 15 and spaced from the outer tube 15. The outer tube 15 and the inner tube 16 form a double tube arranged so that the axial directions thereof are the same. The side walls 15a, 15b, 15c, 15d of the outer tube 15 and the side walls 16a, 16b, 16c, 16d of the inner tube 16 face each other. Each side wall 15a, 15b, 15c, 15d and each side wall 16a, 16b, 16c, 16d are parallel. The distances in the normal direction from the side walls 15a, 15b, 15c, 15d to the side walls 16a, 16b, 16c, 16d, that is, the separation distances La, Lb, Lc, Ld are equal.

  The outer tube 15 and the inner tube 16 are connected by a bottom plate 19 at the lower end in the vertical direction. The space between the outer tube 15 and the inner tube 16 is closed by the bottom plate 19 at the lower end in the vertical direction. A rectangular through hole 19a corresponding to the inner pipe 16 is formed in the bottom plate 19, and oil flows into the inner pipe 16 through the through hole 19a. The outer pipe 15, the inner pipe 16, and the bottom plate 19 form cooling water channels 21 and 22. That is, the flow path between the inner pipe 16 and the outer pipe 15 is a cooling water flow path. Cooling water is supplied to the water channels 21 and 22 from the outside, for example, the outside of the case 2. In the present embodiment, cooling water is supplied from the cooling system 30 for the hybrid as will be described below. However, the present invention is not limited to this, and it is only necessary to provide means for supplying cooling water to the water channels 21 and 22 from the outside.

  The first water channel 21 that is the inlet side of the cooling water and the second water channel 22 that is the outlet side of the cooling water are partitioned by the partition member 17. The partition member 17 is a member that connects the inner surface of the outer tube 15 and the outer surface of the inner tube 16. The partition member 17 is provided on each side wall 15b, 15d of the inner tube 15 facing each other. Moreover, the partition member 17 is arrange | positioned so that the flow-path cross-sectional area of the 1st water channel 21 and the flow-path cross-sectional area of the 2nd water channel 22 may become equal. The partition member 17 is disposed from the upper end in the vertical direction of the first water channel 21 and the second water channel 22 to the vicinity of the lower end in the vertical direction. The first water channel 21 and the second water channel 22 communicate with each other at the lower part in the vertical direction.

  The upper ends in the vertical direction of the first water channel 21 and the second water channel 22 are closed by the lid 18. An oil cooling cooling water pipe 20 is connected to the lid 18. The oil cooling cooling water pipe 20 has a water supply pipe 20a and a drain pipe 20b. The water supply pipe 20 a supplies cooling water to the first water channel 21. Further, the drain pipe 20 b is for discharging cooling water from the second water channel 22. The cooling water flowing into the first water channel 21 from the water supply pipe 20a flows in the first water channel 21 downward in the vertical direction, flows into the second water channel 22, and directs the second water channel 22 in the vertical direction. It flows and flows out to the drain pipe 20b. That is, the flow direction of the cooling water in the first water passage 21 is opposite to the oil flow direction in the cooling section guiding passage 23. Further, the flow direction of the cooling water in the second water passage 22 is the same as the flow direction of the oil in the cooling section guiding passage 23.

  As shown in FIG. 1, the oil cooling cooling water pipe 20 is a part of the cooling water pipe of the hybrid cooling system 30. The vehicle includes a cooling system 30 that cools the power control unit 24. The cooling system 30 includes a water pump (circulation means), a radiator (cooling means), and a cooling water pipe, and the power control unit 24 is cooled by cooling water sent from the radiator to the power control unit 24 via the cooling water pipe. It is a cooling system. The oil cooling cooling water pipe 20 is a part of the cooling water pipe of the cooling system 30, and supplies the cooling water sent by the water pump to the first water channel 21. Moreover, the cooling water piping 20 for oil cooling sends the cooling water discharged | emitted from the 2nd water channel 22 to a radiator. Thus, the oil supply apparatus 1-1 shares the cooling means and the circulation means for the cooling water with the cooling system 30. By using the existing cooling system 30, it is possible to realize a heat exchanger for oil without causing an increase in the size of the apparatus.

  Inside the inner pipe 16 is a cooling section guiding path 23 that guides oil to the oil receiving section 8. The lower end of the cooling section guiding path 23 communicates with the duct section guiding path 14. The upper end of the cooling part guiding path 23 communicates with the oil receiving part 8. The inner pipe 16 is a member that partitions the cooling section guiding path 23 and the outside of the cooling section guiding path 23, and functions as a wall member that forms the cooling section guiding path 23. The first water passage 21 and the second water passage 22 are cooling water passages formed on the opposite side (outside) to the cooling section guiding passage 23 side with the inner pipe 16 therebetween. The inner pipe 16 is made of a material that can efficiently exchange heat between the cooling water flowing through the water channels 21 and 22 and the oil flowing through the cooling unit guiding channel 23.

  Returning to FIG. 1, when the diff ring gear 7 rotates, the oil in the reservoir 9 is sent to the def ring gear 7 and flows into the circumferential guide path 13 from the inlet 13 a of the circumferential guide path 13. The oil is continuously fed into the circumferential guide path 13 by the diff ring gear 7, so that the hydraulic pressure in the circumferential guide path 13 increases. That is, the circumferential guide path 13 functions as an oil concentration portion that collects oil around the diffring gear 7 and increases the oil pressure. As the hydraulic pressure in the circumferential guide path 13 increases, the oil in the circumferential guide path 13 rises toward the oil receiving section 8 along the duct section guide path 14. That is, the diff ring gear 7 and the first guide member 11 function as a pump that increases the oil pressure of the oil and sends the oil upward. In addition, the duct portion guide path 14 functions as a guide portion that guides the traveling direction of the concentrated oil from the rotation direction of the diff ring gear 7 upward in the vertical direction.

  The oil flows through the duct part guiding path 14 and flows into the cooling part guiding path 23. In the cooling part guiding path 23, the oil is cooled by the second guiding member 12 as a heat exchanger. The oil flowing through the cooling unit guiding passage 23 is cooled by exchanging heat with the cooling water flowing through the first water passage 21 and the cooling water flowing through the second water passage 22 via the inner pipe 16. As a result, cooled oil is supplied to the oil receiver 8. From the oil receiver 8, oil is supplied to the first motor generator MG1, the second motor generator MG2, etc., and each part is cooled and lubricated.

  As described above, the oil supply apparatus 1-1 according to the present embodiment does not need to be pumped by an oil pump for cooling the oil, and can reduce power loss due to oil cooling. In addition, the oil pump, the dedicated oil cooler, and the oil pipe can be omitted, and the water pipe can be simplified, so that the cost for cooling the oil can be reduced and the hybrid system can be downsized. Further, the second guide member 12 has fewer brazing points than a conventional oil cooler and can be manufactured at a low cost.

  In addition, heat exchange between the oil and the cooling water is performed in the cooling section guide passage 23 that is sent out by the rotation of the diff ring gear 7 to increase the flow velocity of the oil. The oil is efficiently cooled by the high oil flow rate. As the vehicle speed increases, the flow velocity of the oil flowing through the cooling unit guiding path 23 increases, and the oil cooling efficiency in the second guiding member 12 is improved.

  Moreover, according to the oil supply apparatus 1-1 of this embodiment, unlike the conventional cooling method which cools oil using the oil pump driven by the engine, the engine is stopped and the vehicle is driven by the power of the motor generator. Even during EV travel, the oil is cooled. Therefore, the motor generator can be appropriately cooled during EV traveling, and the efficiency of the motor generator can be improved.

  Further, the second guiding member 12 can cool not only the oil flowing through the cooling section guiding path 23 but also the oil outside the outer tube 15. When the vehicle travels, oil or the like flying from each gear in the power transmission device 1 contacts the outer surface of the outer tube 15. The second guide member 12 can cool the oil adhering to the outer surface of the outer tube 15 by heat exchange with cooling water and guide the oil to the storage unit 9.

  In this embodiment, although the case where the gear which sends out the oil of the storage part 9 by rotating from the storage part 9 is the diff ring gear 7 was demonstrated to the example, a gear is not limited to this. Any gear may be used as long as it rotates in conjunction with the rotation of the wheels to feed out the oil in the reservoir 9.

  In the present embodiment, the oil is cooled in the second guide member 12, but in addition to this, the oil may be heated in the second guide member 12. For example, water having a temperature higher than the oil temperature of the oil may be supplied to the first water passage 21 and the oil may be heated by heat exchange via the inner pipe 16. If the oil is heated in the second induction member 12 when the oil temperature is low, the oil temperature can be raised to an appropriate temperature at an early stage to promote warm-up.

  The configuration of the second guide member 12 is not limited to that illustrated. The second guide member 12 has a guide path that guides the oil sent out by the diff ring gear 7 to the oil receiving portion 8, and has another shape that can exchange heat between the oil in the guide path and the cooling medium. May be. For example, in the second guide member 12 of the present embodiment, the inside of the inner pipe 16 is the cooling section guide path 23 and the space between the outer pipe 15 and the inner pipe 16 is a cooling water channel. Thus, the inside of the inner pipe 16 may be a cooling water channel, and the space between the outer tube 15 and the inner tube 16 may be a cooling unit guiding path 23.

  Moreover, the cross-sectional shape of the 2nd guide member 12 is not limited to a rectangle, For example, you may be made circular. Moreover, in this embodiment, although the 2nd guide member 12 is a tubular shape and the cross-sectional shape is a closed figure, it is not limited to this. The shape of the second guide member 12 may be a shape in which a part of the side wall is opened. For example, the cooling portion guiding path 23 may be opened to the outside at the side walls 15a and 16a shown in FIG. 4 so that the second guiding member 12 has a U-shaped cross section.

  Moreover, the 2nd guide member 12 may have the component which can raise the cooling efficiency of oil further. For example, a component that increases the contact area between the oil and the inner pipe 16 may be provided in the second guide member 12. As an example, fins that protrude from the cooling unit guiding path 23 may be provided in the inner tube 16. In the case where fins are provided, the fins preferably extend along the oil flow direction in the cooling section guide passage 23. For example, instead of making each side wall 16a, 16b, 16c, 16d of the inner pipe 16 into a flat plate shape, the cross-sectional shape orthogonal to the oil flow direction is a curved shape (for example, a shape that curves in an S shape) Or a bent shape (for example, a shape that is bent in a W shape). In this way, the contact area between the oil and the inner pipe 16 can be increased with respect to the flow path cross-sectional area of the cooling section guiding path 23.

  In addition, the guide paths 13, 14, and 23 may have an area changing portion that increases the oil flow rate in the cooling section guide path 23. For example, the duct portion guide path 14 may be an area changing portion in which the downstream channel cross-sectional area in the oil flow direction is smaller than the upstream channel cross-sectional area. In this way, the oil flow rate increases from the circumferential guide path 13 toward the cooling section guide path 23 in the duct section guide path 14, and the oil flow speed in the cooling section guide path 23 increases. Therefore, the oil cooling efficiency by the second guiding member 12 can be improved by increasing the oil flow rate in the cooling section guiding path 23. In the present embodiment, in the duct portion guide path 14, the flow path cross-sectional area gradually decreases from the upstream side to the downstream side in the oil flow direction. Thereby, in the duct part guide path 14, the oil flow rate can be gradually increased from the upstream side to the downstream side in the oil flow direction, and the flow rate of oil flowing into the cooling part guide path 23 can be improved.

  Further, the flow path cross-sectional area of the cooling section guide path 23 may be smaller than the flow path cross-sectional area of the duct section guide path 14. Even in this case, it is possible to increase the flow velocity of the oil flowing through the cooling section guiding path 23. In this case, the connection part between the duct part guiding path 14 and the cooling part guiding path 23 is an area changing part.

  Further, the flow path cross-sectional area on the downstream side in the oil flow direction in the cooling section guiding path 23 may be smaller than the flow path cross-sectional area on the upstream side. In this way, the downstream flow velocity in the oil flow direction in the cooling section guiding passage 23 becomes larger than the upstream flow velocity. In this case, the cooling part guiding path 23 becomes an area changing part. As described above, in the guiding paths 13, 14, and 23, the area changing portion is provided on the upstream side of the downstream end of the second guiding member 12 in the oil flow direction, so that the flow velocity in the cooling section guiding path 23 is increased. The oil cooling efficiency by the second guide member 12 can be increased.

  The first guide member 11 may have a structure that can increase the pressure of the circumferential guide path 13. By increasing the pressure in the circumferential guide path 13, it is possible to increase the oil flow rate in the cooling section guide path 23 and improve the oil cooling efficiency. For example, the flow passage cross-sectional area on the downstream side (outlet 13b side) in the oil flow direction in the circumferential guide path 13 relative to the duct portion 11c is made smaller than the flow passage cross-sectional area on the upstream side (inlet 13a side). It is possible to increase the pressure of the circumferential guide path 13. For example, the axial gap between the side wall portion 11a and the side surface of the diff ring gear 7 is reduced downstream in the oil flow direction, or the radial gap between the curved surface portion 11b and the outer peripheral surface 7b of the diff ring gear is set in the oil flow direction. The pressure in the circumferential guide path 13 can be increased by reducing the pressure on the downstream side.

  In the present embodiment, the second induction member 12 functions as a heat exchanger. However, instead of or in addition to this, the first induction member 11 may function as a heat exchanger. Good. Moreover, a heat exchanger that performs heat exchange between the oil in the oil receiving portion 8 and the cooling water supplied from the outside may be provided.

  The oil supply device 1-1 of the present embodiment can be applied to a power transmission device for a vehicle other than a hybrid vehicle. A power transmission device comprising a gear that feeds oil from the reservoir 9 by rotating in conjunction with the rotation of the wheel, and an oil receiving portion that has an oil inflow port and supplies the inflowing oil to the supplied portion If so, the oil supply apparatus 1-1 of the present embodiment is applicable.

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

  As described above, the oil supply device according to the present invention is suitable for reducing power loss accompanying oil cooling.

DESCRIPTION OF SYMBOLS 1 Power transmission device 1-1 Oil supply apparatus 7 Defring gear 8 Oil receiving part 9 Storage part 11 1st guide member 12 2nd guide member 13 Circumferential guide path 14 Duct part guide path 15 Outer pipe 16 Inner pipe 21 First water path 22 Second water passage 23 Cooling section guide passage 24 Power control unit 25 Battery 30 Cooling system

Claims (5)

An oil receiving portion that is disposed in the power transmission device of the vehicle, has an oil inlet, and supplies the inflowing oil to the supplied portion;
A storage part that is formed in the power transmission device and stores oil;
A gear that is arranged in the power transmission device and rotates to send oil from the reservoir by rotating;
A guide path for guiding oil sent out by the gear to the oil receiving portion;
A heat exchanger for exchanging heat between the cooling medium supplied from the outside and the oil in the induction path;
An oil supply device comprising: The heat exchanger includes a wall member that forms the guide path,
The oil supply apparatus according to claim 1, further comprising a flow path of the cooling medium formed on the opposite side of the guide path side with the wall member interposed therebetween. The heat exchanger includes an outer tube, and an inner tube disposed inside the outer tube and spaced from the outer tube,
The oil supply apparatus according to claim 1, wherein an inside of the inner pipe is the guide path, and a passage between the inner pipe and the outer pipe is a flow path of the cooling medium. In the guide path, an area changing portion having a downstream channel cross-sectional area smaller than an upstream channel cross-sectional area in the flow direction on the upstream side of the downstream end of the heat exchanger in the oil flow direction. The oil supply apparatus according to any one of claims 1 to 3. A motor generator that can function as a power source for traveling, a battery, a power control unit that connects the battery and the motor generator, and a cooling system that cools the power control unit are mounted on the vehicle,
The oil supply device according to any one of claims 1 to 4, wherein a cooling unit and a circulation unit for the cooling medium are shared with the cooling system.

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