JP2015068490A - Vehicle drive unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a drive loss of a gear for scooping up oil, and to supply the oil to a cooling-necessary part even at the retreat of a vehicle, in a vehicle drive unit which comprises a first oil tank arranged in a space above an output gear for supplying the oil to the cooling-necessary part, and cools the cooling-necessary part by the oil which is scooped up by the gear.SOLUTION: A second oil tank (37) which extends downward of a first oil tank (32), and to a vehicle front side rather than an axial core (17C) of an output gear (17), and receives oil leaked from the first oil tank (32) is arranged at a vehicle front side of the first oil tank (32). A guide wall (38) which introduces oil scooped up by the output gear (17) to the first oil tank (32) at the retreat of the vehicle is arranged at a rear side part of the second oil tank (37).

Description

  The present invention relates to a vehicle drive device, and more particularly to a vehicle drive device that cools a cooling-required part in a vehicle such as a hybrid vehicle, without using dedicated oil supply means such as an electric oil pump, and also when the vehicle is reverse. The present invention relates to a vehicle drive device that supplies oil that is lifted by a gear to a cooling-required portion.

In a hybrid vehicle as a vehicle, an electric motor as a cooling required part generates heat when a vehicle driving force is generated. Therefore, the electric motor needs to be cooled in order to keep the insulating film below the heat resistant temperature. For this reason, the drive device is provided with an oil supply device that supplies the oil pumped up by the gears to the electric motor.
There are the following prior art documents as an oil supply device of such a drive device.

JP 2010-203493 A

  The vehicle power transmission device according to Patent Document 1 includes an oil tank in a device case containing a planetary gear device, and the oil tank includes a first introduction portion that receives oil that is swept up during the forward rotation of the gear; And a second introduction portion that receives oil that is swept up when the gear rotates in reverse, and the oil is supplied from the oil tank to the planetary gear unit. Specifically, the second introduction part is a horizontal hole that opens to the side surface of the oil tank, and the oil that is swept up by the gear is reflected obliquely downward by a second oil guide disposed on the upper side of the horizontal hole. It is captured by the second oil guide side disposed on the lower side and led to the second introduction portion.

By the way, in said patent document 1, the oil supply means for exclusive use of 2nd introduction parts, such as an oil guide other than an oil tank, is needed. Further, since the oil bounced back by the oil guide is guided to the side hole of the oil tank, the oil is scattered and the introduction efficiency into the oil tank is deteriorated. Furthermore, the oil level in the drive device becomes high, and there is a disadvantage that the drive loss of the gear increases.

  Accordingly, the present invention provides a vehicle drive device that cools a cooling-required portion with oil that has been lifted by a gear, does not use dedicated oil supply means, reduces drive loss of the gear that lifts oil, and It is an object of the present invention to provide a vehicle drive device that can supply oil to a cooling-required portion even when reversing.

  The present invention includes a housing in which an oil storage portion is formed in a lower portion, an output gear disposed in the housing, and a lower portion on the vehicle rear side of the output gear so that the lower portion is immersed in the oil in the oil storage portion. A final gear to which driving force is transmitted from the output gear via an intermediate gear, a first oil tank that is disposed in a space above the output gear and supplies oil to a cooling-required portion, and a vehicle In a vehicle drive device comprising an oil garter that takes in oil that is lifted up by the final gear during forward travel from an oil introduction port and guides it to the first oil tank, the first oil tank is disposed on the vehicle front side of the first oil tank. A second oil tank that extends below the tank and forward of the shaft of the output gear and receives oil overflowing from the first oil tank. Place Rutanku, characterized in that said output gear when the vehicle backward is provided with a guide wall for guiding the oil frying scraped upward to the first oil tank rear side of the second oil tank.

  The present invention provides a vehicular drive device that cools a cooling-required portion with oil picked up by a gear, does not use a dedicated oil supply means, reduces drive loss of the gear that lifts up oil, and when the vehicle moves backward Also, oil can be supplied to the parts that require cooling.

FIG. 1 is a right side view of the drive device. (Example) FIG. 2 is a right side view of the driving device showing the internal structure of the second oil tank with the plate (the other side wall) removed. (Example) FIG. 3 is a right side view of the drive device showing the flow of oil when the vehicle moves forward. (Example) FIG. 4 is a right side view of the drive device showing the flow of oil when the vehicle is moving backward. (Example) FIG. 5 is an enlarged view of the vicinity of the second oil tank showing the flow of oil when the vehicle moves forward. (Example) FIG. 6 is an enlarged view of the vicinity of the second oil tank showing the flow of oil when the vehicle moves backward. (Example) FIG. 7 is an enlarged sectional view taken along line VII-VII in FIG. (Example) FIG. 8 is a perspective view of the drive device and the oil supply device. (Example) FIG. 9 is a skeleton diagram of the vehicle. (Example)

  The present invention provides a vehicular drive device that cools a cooling-required portion with oil picked up by a gear, does not use a dedicated oil supply means, reduces drive loss of the gear that lifts up oil, and when the vehicle moves backward In addition, the purpose of supplying oil to the cooling-required part is realized by providing two oil tanks for receiving the oil that has been lifted by the gear when the vehicle moves forward and backward.

1 to 9 show an embodiment of the present invention.
As shown in FIG. 9, a vehicle 1 composed of a hybrid vehicle or the like is equipped with an engine (ENG) 2 as a drive source and a drive device 3 connected to the engine 2. Left and right wheels 5 and 5 are connected to the drive device 3 via an axle 4.
The drive device 3 includes a housing 7 in which an oil storage portion 6 is formed in a lower portion, and an input shaft 8 disposed in the housing 7 in the vehicle width direction (vehicle left-right direction) and rotated by the engine 2; A power transmission mechanism (planetary gear mechanism: transmission gear) 9 disposed on the input shaft 8 and a differential mechanism 10 connected to the power transmission mechanism 9 are provided.
The power transmission mechanism 9 includes a first planetary gear mechanism (PG1) 11 disposed on the engine 2 side, and a second planetary gear mechanism disposed on the side away from the engine 2 connected to the first planetary gear mechanism 11. (PG2) 12.
Further, the drive device 3 includes a first electric motor (first motor generator: MG1) 13 and a second electric motor (second motor) disposed on the left and right sides of the power transmission mechanism 8 in the axial direction of the input shaft 8 (the vehicle left-right direction). Generator: MG2) 14. The first electric motor 13 and the second electric motor 14 generate heat when the vehicle driving force is generated, and are cooling-necessary parts that need to be cooled in order to keep the insulating film at or below the heat-resistant temperature.
A one-way clutch 15 is attached between the input shaft 8 and the housing 7, and an oil pump (O / P) 16 is attached at an end portion opposite to the engine 2.

An output gear 17 connected to the first planetary gear mechanism 11 of the power transmission mechanism 9 is disposed in the housing 7. The output gear 17 meshes with a first intermediate gear 19 provided at one end of the intermediate shaft 18. A second intermediate gear 20 is provided at the other end of the intermediate shaft 18. A final gear 21 of the differential mechanism 10 is engaged with the second intermediate gear 20. The second intermediate gear 20 and the final gear 21 constitute a speed reduction mechanism 22. Accordingly, the driving force is transmitted from the output gear 17 to the final gear 21 via the first intermediate gear 19 and the second intermediate gear 20 of the intermediate shaft 18.
In this embodiment, as shown in FIGS. 1 and 2, when the axle 4, the input shaft 8, and the intermediate shaft 18 are arranged, the input shaft 8 is more than the intermediate shaft 18 and the axle 4 in a side view. Located in front of the vehicle, the intermediate shaft 18 is positioned behind and diagonally above the input shaft 8, the axle 4 is positioned behind and diagonally below the input shaft 8, and the intermediate shaft 18 and the axle 4 is positioned so as to overlap with the vehicle vertical direction.

  As shown in FIG. 1, the oil for lubricating the oil surface M1 stays in the oil reservoir 6 of the housing 7 when the vehicle is stopped. In this case, the final gear 21 is arranged on the vehicle rear side of the output gear 17 so that the lower part is immersed in the oil in the oil reservoir 6. Therefore, when the final gear 21 rotates, the oil in the oil reservoir 6 of the housing 7 is lifted up by the final gear 21. The oil level in the oil reservoir 6 of the housing 7 decreases from the oil level M1 to the oil level M2 when the final gear 21 scoops up the oil when the vehicle moves forward and when the vehicle moves backward.

As shown in FIG. 8, the oil pumped up by the final gear 21 is supplied to the driving device 3 to the first motor 13 and the second motor 14 that are cooling-requiring parts, and the first motor 13 and the second motor 14 are supplied. An oil supply device 23 is provided for cooling the oil.
The oil supply device 23 includes an oil garter 24 disposed above the power transmission mechanism 9 and attached along the outer peripheral wall 7 </ b> A of the housing 7.
The oil garter 24 includes a garter bottom 25, a garter one side 26 disposed on the first electric motor 13 side with respect to the garter bottom 25, and a garter disposed on the second electric motor 14 side with respect to the garter bottom 25. It is comprised with the other side part 27. FIG. Further, the oil garter 24 is formed in a U-shaped cross section, and in a side view, an upright portion 29 having an oil introduction port 28 close to the final gear 21 in the vehicle vertical direction, and the front and rear of the vehicle above the power transmission mechanism 9. A horizontal portion 31 extending in the direction and having a closed end portion 30 is formed.
The horizontal portion 31 of the oil garter 24 includes a first oil tank 32 that stores the oil that has been lifted up by the final gear 21 and taken in from the oil introduction port 28 when the vehicle moves forward. The first oil tank 32 is disposed in a space above the output gear 17 in order to supply oil to the first electric motor 13 and the second electric motor 14 that are cooling-required portions.

As shown in FIG. 8, the oil garter 24 includes a pair of first oil supply portions (first guide pipes) that extend from the first oil tank 31 to above the first electric motor 13 and supply oil to the first electric motor 13. 33A and 33B are provided. The pair of first oil supply portions 33 </ b> A and 33 </ b> B is oriented in the vehicle width direction as in the input shaft 8 in the axial direction.
The oil garter 24 includes a pair of second oil supply portions (second guide pipes) 34 </ b> A and 34 </ b> B that extend from the first oil tank 32 to above the second electric motor 14 and supply oil to the second electric motor 14. It is done. The pair of second oil supply portions 34 </ b> A and 34 </ b> B has the axial direction facing the vehicle width direction, like the input shaft 8.
The oil garter 24 is constituted by a first fixing bolt 35 at an end portion on the final gear 21 side (upstream side of oil) and a second fixing bolt 36 at an end portion on the upper side (downstream side of oil) of the power transmission mechanism 9. The housing 7 is fixed.

As shown in FIGS. 1, 2, and 5, the first oil tank 32 has a shaft 17 </ b> C (the input shaft 8 of the input shaft 8) below the first oil tank 32 and on the vehicle front side. A second oil tank 37 that receives oil overflowing from the first oil tank 32 and extending to the front side of the vehicle from a portion that coincides with the shaft center is disposed.
As shown in FIGS. 2 and 5, a guide wall that guides the oil that is lifted up by the final gear 21 and the output gear 17 to the first oil tank 32 when the vehicle moves backward is provided on the rear side of the second oil tank 37. 38 is provided.
As shown in FIGS. 2 and 5, the guide wall 38 extends in the vehicle vertical direction and is disposed on the vehicle front side of the vehicle front end portion of the first oil tank 32. A second guide wall 41 is provided that extends downward flush with the vehicle front end of the tank 32 and forms an oil introduction passage 40 between the tank 32 and the first guide wall 39.

As shown in FIG. 7, the oil introduction passage 40 is formed wider than the second oil tank 37 in the vehicle width direction, and opens in the vehicle vertical direction. Specifically, the oil introduction passage 40 has a housing 7 as one of a pair of side walls that communicate with each other between the first guide wall 39 and the second guide wall 41 at both ends in the vehicle width direction. Are formed in a closed cross section by a housing side wall 42 integral with the plate and a plate 43 fastened to the housing 7 as the other side wall. Therefore, the oil introduction passage 40 has a function as an oil guide chamber that smoothly guides the oil so that the oil is not scattered.
The plate 43 is in contact with the front ends of the first guide wall 39 and the second guide wall 41 from the inner peripheral surface of the outer peripheral wall 7 </ b> A of the housing 7, and includes an upper first mounting bolt 44 and a lower second mounting bolt 45. Thus, the first boss portion 46 and the second boss portion 47 of the housing 7 are fixed to each other.
As shown in FIG. 7, the second oil tank 37 includes an outer peripheral wall 7A of the housing 7, a distal end portion of the first guide wall 39, and another housing that extends from the outer peripheral wall 7A and is connected to the first guide wall 39. A closed space is formed by the side wall 48 and a part of the plate 43.
In addition, as shown in FIG. 6, the housing 7 has a step portion that guides oil from below upward above the oil introduction passage 40 and along the axis (vehicle vertical direction) of the oil introduction passage 40. 49 is formed.
Further, as shown in FIG. 5, a tank bottom wall 50 is disposed between the outer peripheral wall 7 </ b> A of the housing 7 and the lower end portion of the first guide wall 39. A drain hole 51 through which oil in the second oil tank 37 gradually flows out is formed in the lowest part of the tank bottom wall 50. The drain hole 51 is formed with a predetermined opening area (small diameter) so that a predetermined amount of oil introduced into the second oil tank 37 from above can be stored, and the oil stored in the second oil tank 37 is stored. Is gradually dropped.

Next, the operation according to this embodiment will be described.
As shown in FIGS. 3 and 5, when the vehicle moves forward, the oil that has been lifted up by the final gear 21 is guided to the first oil tank 32 by the oil garter 24 and stored in the first oil tank 32. A pair of first oil supply parts (first guide pipes) 33A and 33B and a pair of second oil supply parts 34A and 34B are used to drop oil to the first electric motor 13 and the second electric motor 14, and the first electric motor 13 and The second motor 14 is cooled.
In this embodiment, during high speed operation, when the amount of oil swept up by the final gear 21 is large, the oil overflowing from the first oil tank 32 is temporarily stored in the second oil tank 37, and the lower part of the housing 7 In this structure, the oil level of the oil stored in the oil storage section 6 is lowered to the oil level M2, and the stirring resistance due to the rotation of the final gear 21, which is a gear that lifts the oil, is reduced.
In such a structure, when the vehicle moves backward, the final gear 21 and the output gear 17 rotate reversely and the direction in which the oil is lifted is changed, so that the oil cannot be stored in the first oil tank 32, and the first The cooling oil cannot be supplied to the electric motor 13 and the second electric motor 14. Therefore, dedicated oil supply means such as an electric oil pump is required.
Therefore, in this embodiment, the first oil motor 13 and the second motor 14 are cooled and supplied without using a dedicated oil supply means when the vehicle moves backward.
On the other hand, when the vehicle moves backward, as shown in FIGS. 4 and 6, the final gear 21 and the output gear 17 are reversed, the direction in which the oil is lifted is changed, and the final gear 21 and the output gear 17 are passed through. Then, the oil is lifted up around the second oil tank 37. The oil is guided and stored in the first oil tank 32 because a part of the second oil tank 37 is used as an oil guide chamber.
In this case, since the oil is introduced into the first oil tank 32 by surrounding the periphery of the oil introduction path 40 by the guide wall 38, the oil is not scattered and the oil introduction efficiency is increased. Further, since the oil is introduced from the upper part of the first oil tank 32, substantially all of the introduced oil can be stored in the first oil tank 32 without flowing out to the surroundings. Further, since the oil level accumulated in the oil reservoir 6 at the lower part of the housing 7 falls to the oil level M2, disturbance resistance due to the rotation of the final gear 21 can be reduced.
As a result, the oil pumped up through the final gear 21 and the output gear 17 is introduced into the first oil tank 32 and stored without adding any dedicated oil supply means or new parts. Then, cooling oil is dropped onto the first motor 13 and the second motor 14 by the pair of first oil supply parts (first guide pipes) 33A and 33B and the pair of second oil supply parts 34A and 34B, The first motor 13 and the second motor 14 can be cooled.

Although the embodiments of the present invention have been described above, the configuration of the above-described embodiments will be described for each claim.
First, in the first aspect of the invention, the first oil tank 32 extends to the vehicle front side below the first oil tank 32 and extends from the axis 17C of the output gear 17 to the vehicle front side. A second oil tank 37 for receiving the oil overflowing from 32 is disposed. A guide wall 38 that guides the oil that the output gear 17 lifts upward when the vehicle moves backward to the first oil tank 32 is provided on the rear side of the second oil tank 37.
As a result, when the vehicle moves forward, as shown in FIGS. 3 and 5, the amount of oil that is swept up by the final gear 21 increases as the rotational speed of the final gear 21 increases, and the oil from the first oil tank 32 overflows to the outside. . At this time, the oil overflowing from the first oil tank 32 is received in the second oil tank 37, and a predetermined amount of oil is temporarily retained in the second oil tank 37, as shown in FIG. The oil level of the oil stored in the oil storage part 6 can be lowered to the oil level M2. For this reason, the drive loss by the final gear 21 which is a gear which pumps up oil stirs the oil in the oil storage part 6 can be reduced.
On the other hand, when the vehicle moves backward, as shown in FIGS. 4 and 6, the final gear 21 and the output gear 17 rotate in the opposite direction to that when the vehicle moves forward, and the front portion of the output gear 17 scrapes the oil upward. It becomes fried. At this time, the oil scooped up by the output gear 17 can be guided into the first oil tank 32 through the guide wall 38 and the stepped portion 49 provided in the second oil tank 37. For this reason, oil can be supplied to the first oil tank 32 even when the vehicle is moving backward, and oil can be supplied from the first oil tank 32 to the first electric motor 13 and the second electric motor 14 which are cooling-required parts. .
Therefore, in this embodiment, it is possible to reduce the driving loss of the final gear 21 that is a gear that lifts up the oil and to supply the oil to the first electric motor 13 and the second electric motor 14 even when the vehicle is reverse.
In the invention according to claim 2, the guide wall 38 extends in the vertical direction of the vehicle and is disposed on the vehicle front side of the front end portion of the first oil tank 32, and the first oil tank 32. A second guide wall 41 is provided that extends downward flush with the front end of the vehicle and forms an oil introduction passage 40 between the first guide wall 39.
As a result, the oil lifted up by the output gear 17 by the oil introduction passage 40 formed between the first guide wall 39 and the second guide wall 41 can be more reliably guided to the first oil tank 32.
Further, as shown in FIG. 6, the oil flowing along the second guide wall 41 and the stepped portion 49 is caused to flow into the first oil tank 32 along the outer peripheral wall 7A on the front end side of the first oil tank 32, The amount of oil supplied to the first oil tank 32 can be increased.
In the invention according to claim 3, the oil introduction passage 40 is formed wider in the vehicle width direction than the second oil tank 37.
As described above, since the width of the oil introduction passage 40 is widened, it is possible to increase the amount of oil introduced into the first oil tank 32 by using a structure that makes it easier to introduce the oil that is swept up by the output gear 17 into the oil introduction passage 40. it can.
In the invention according to claim 4, the oil introduction passage 40 includes a housing side wall 42 that is a pair of side walls that mutually communicate between the first guide wall 39 and the second guide wall 41 at both ends in the vehicle width direction. And a plate 43 having a closed cross section. Further, one housing side wall 42 of the pair of side walls is formed integrally with the housing 7, and the other of the pair of side walls is formed by a plate 43 fastened to the housing 7.
Accordingly, the oil introduced by the output gear 17 can be more reliably guided to the first oil tank 32 by setting the oil introduction passage 40 to a closed cross section.
Further, since one housing side wall 42 of the pair of side walls in the oil introduction passage 40 is formed integrally with the housing 7 and the other side of the pair of side walls is formed by the plate 43 fastened to the housing 7, the structure of the housing 7 is simplified. Thus, the oil introduction passage 40 can be formed in a closed cross section.

  The drive device according to the present invention can be applied to various vehicles.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Engine 3 Drive apparatus 6 Oil storage part 7 Housing 7A Outer peripheral wall 8 Input shaft 9 Power transmission mechanism 10 Differential mechanism 11 First planetary gear mechanism 12 Second planetary gear mechanism 13 First electric motor 14 Second electric motor 17 Output gear 17C Output gear shaft center (input shaft shaft center)
18 intermediate shaft 19 first intermediate gear 20 second intermediate gear 21 final gear 23 oil supply device 24 oil garter 25 garter bottom portion 26 garter one side portion 27 garter other side portion 28 oil introduction port 32 first oil tanks 33A and 33B first Oil supply part 34A, 34B Second oil supply part 37 Second oil tank 38 Guide wall 39 First guide wall 40 Oil introduction passage 41 Second guide wall 42 Housing side wall (one side wall)
43 Plate (the other side wall)
50 Tank bottom wall 51 Drain hole

Claims (4)

  A housing in which an oil reservoir is formed in a lower portion; an output gear disposed in the housing; and a lower portion on the vehicle rear side of the output gear so as to be immersed in oil in the oil reservoir and A final gear to which driving force is transmitted from the output gear via the intermediate gear, a first oil tank that is disposed in a space above the output gear and supplies oil to the cooling-required portion, and the final gear when the vehicle moves forward In a vehicle drive device including an oil garter that takes in oil that is swept up by a gear from an oil introduction port and guides the oil to the first oil tank, a vehicle front side of the first oil tank is below the first oil tank. And a second oil tank extending forward of the shaft of the output gear and receiving oil overflowing from the first oil tank. Location, and the vehicle drive device, characterized in that said output gear when the vehicle backward is provided with a guide wall for guiding the oil frying scraped upward to the first oil tank rear side of the second oil tank.   The guide wall extends in the vertical direction of the vehicle and is disposed below the first front wall of the first oil tank and flush with the front end of the first oil tank. The vehicle drive device according to claim 1, further comprising a second guide wall that extends and forms an oil introduction passage between the first guide wall and the first guide wall.   The vehicle drive device according to claim 2, wherein the oil introduction passage is formed wider in the vehicle width direction than the second oil tank.   The oil introduction passage is formed in a closed cross section having a pair of side walls that communicate with each other between the first guide wall and the second guide wall at both ends in the vehicle width direction, and one of the pair of side walls. 4. The vehicle drive device according to claim 2, wherein the vehicle is integrally formed with the housing, and the other of the pair of side walls is formed by a plate fastened to the housing. 5.

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