JP2011185283A - Driving device - Google Patents

Abstract

A simple drive device having a cooling oil passage structure that can cool an electric motor without being affected by the operating state of other hydraulically operated devices and the electric motor, and can sufficiently suppress energy loss for the cooling.
A generator motor 20 located on one side of a partition wall 11 within a case 10, a gear transmission mechanism 30 located on the other side of the partition wall 11, and a cooling mechanism 50 for cooling the generator motor 20 are provided. The gear transmission mechanism 30 includes a ring gear 31, a sun gear 32, a pinion 33 that meshes with both the gears 31, 32, and a carrier 34 that rotates and revolves the pinion 33, and a cooling mechanism 50 The oil jet outlet 63a for jetting oil from the carrier 34 in the vicinity of the stator 21 of the generator motor 20 toward the generator motor 20 side, and the oil jetted from the oil jet outlet 63a formed in the partition wall portion 11 And an oil passage hole 66 that allows passage toward the stator 21.
[Selection] Figure 1

Description

  The present invention relates to a drive device, and more particularly to a drive device suitable for driving a vehicle in which a gear transmission mechanism is connected to a rotor of an electric motor and a stator of the electric motor is cooled with oil.

  It has an electric motor such as a motor and a motor generator and a gear transmission mechanism that constitutes a reduction gear and a transmission, and has a drive device such as an in-wheel motor that drives a drive wheel of the vehicle, or an engine together with the electric motor and the gear transmission mechanism. In a hybrid drive device, it is not easy to dissipate heat from the motor housed in the case, and the motor is cooled by using lubricating / cooling liquid for the gear transmission mechanism or hydraulic oil for the hydraulic friction engagement element. Many.

  As this type of drive device, for example, there is a through hole in the vicinity of a wet multi-plate brake mechanism, which is a hydraulic friction engagement element, in the upper part of the partition wall that partitions the transmission storage chamber and the motor storage chamber in the case. In which the oil used for the operation of the brake mechanism is guided to the coil end portion of the stator of the electric motor through the through hole (see, for example, Patent Document 1).

  In addition, the planetary gear chamber in the case and the motor chamber transmission chamber communicate with each other at the upper part of the partition wall between the two chambers, and the oil pumped up by the rotating element of the planetary gear flows out from the gear chamber side to the motor chamber side, A cooling system is also known (for example, see Patent Document 2).

JP 2008-279916 A JP 2008-263757 A

  However, in the former former drive device in which the oil used for the operation of the hydraulic friction engagement element is guided to the stator of the motor through the through hole in the upper part of the partition wall, the motor side is separated from the transmission mechanism side. Although there is an advantage that the oil supply path of the system need not be provided in parallel and the capacity of the oil pump can be reduced, an oil path is formed in the thick part of the transmission case or a part of the friction engagement element It was necessary to use for oil path formation. As a result, the cooling oil passage structure becomes complicated, and the supply flow rate of the cooling oil changes depending on the operating state of the friction engagement element.

  On the other hand, in the latter latter drive device in which oil is pumped up on the gear chamber side and flows out to the motor chamber side, for example, a low-rotation / high-torque motor is mounted to increase the transmission gear. In such a case, there is a problem in that energy loss for pumping up oil must be increased because it is necessary to secure the required cooling oil flow rate.

  Therefore, the present invention is a simple drive of a cooling oil passage structure that can cool an electric motor without being influenced by the operating state of other hydraulically operated devices and the electric motor, and can sufficiently suppress energy loss for the cooling. A device is provided.

  In order to solve the above-described problems, a drive device according to the present invention includes (1) a case having a partition portion that divides the interior into two chambers, a stator that is inside the case and is located on one surface side of the partition portion, and An electric motor having a rotor that rotates with respect to the stator; a gear transmission mechanism that is located inside the case and located on the other surface side of the partition wall; and a cooling mechanism that cools the electric motor with oil. A transmission mechanism includes a ring gear, a sun gear disposed at the center of the ring gear, a pinion gear meshing with the sun gear and the ring gear, and a carrier that rotatably supports the pinion gear and revolves the pinion gear. A planetary gear mechanism having a planetary gear mechanism, wherein the cooling mechanism includes the ring gear, the sun gear, and the key. An oil ejection part provided in a rotating element in the vicinity of the stator in the rear and configured to communicate the two chambers with an oil ejection part that ejects the oil toward the electric motor side and a partition part of the case, and the oil ejection part And an oil passage hole that allows oil ejected from the motor to pass toward the stator of the electric motor.

  With this configuration, when the oil is ejected from the oil ejection portion of the rotating element located in the vicinity of the stator of the electric motor in the planetary gear mechanism, the flow direction of the oil is deflected radially outward by the centrifugal force acting on the oil. Will be. And this oil passes through the oil passage hole formed in the partition part, and is supplied as a coolant to the stator of the electric motor. Therefore, a cooling oil passage structure for supplying cooling oil to the stator of the motor can be supplied to the stator of the motor without being affected by the operating state of other hydraulic pressure devices and the motor. It can be simplified using a gear lubricating oil path. In addition, since the oil is not pumped up and the oil is supplied using the centrifugal force on which the oil acts, energy loss for supplying the oil for cooling can be sufficiently suppressed.

  In the drive device described in (1) above, (2) the rotating element in the vicinity of the stator is the carrier, and the carrier is located near the end of the pinion shaft that supports the pinion so as to rotate. It is preferable to have a jet outlet for jetting out. With this configuration, the cooling oil can be supplied to the stator side using the pinion cooling oil passage, and a plurality of oil jets corresponding to the number of pinions can be easily provided.

  In the drive device described in (2) above, (3) a flow restricting member that restricts the flow direction of the oil to a specific flow direction toward the stator in the vicinity of the ejection port is mounted on the carrier. It is good. With this configuration, the oil ejected from the oil ejection portion can be efficiently supplied to the coil end portion of the stator. In addition, when a plurality of pinion shafts are provided, and particularly when a large number of three or more pinion shafts are provided, it is preferable to form the flow restricting member in an annular shape.

  In the drive device described in the above (2) and (3), it is desirable that (4) the carrier has an oil passage that guides the oil to the jet outlet while flowing the oil in a direction away from the rotation center line. . With this configuration, it is possible to promote the ejection of oil from the ejection port by the hydraulic component based on the centrifugal force.

  In this case, the oil passage has a first oil passage portion that ejects the oil in a radially outward direction that is separated from the rotation center line, and a second oil passage portion that penetrates the pinion shaft in the axial direction. In addition, it is more preferable that a deflection member for deflecting the flow direction of the oil ejected from the first oil passage portion in the radially outward direction toward the second oil passage portion is attached to the carrier. If it does in this way, the 1st oil passage part and the 2nd oil passage part can be made straight, respectively, while the processing of the oil passage to a career can be made easy, and the deflection member which can deflect the flow direction of the oil from the 1st passage part By appropriately setting the angular range of the carrier rotation direction, the axis of the first oil passage portion and the axis of the second oil passage portion may be displaced in the carrier rotation direction, and the degree of freedom in design is increased. . The deflection member may be formed in an annular shape so that the angular range of the deflection member in the carrier rotation direction is maximized.

  Further, when the jet port is formed on one end side of the pinion shaft, and the first oil passage portion and the deflection member of the oil passage are arranged on the other end side of the pinion shaft, one end side of the pinion shaft This eliminates the need for other members that form an oil passage, and allows the oil jet outlet to be located at a position close to the stator of the electric motor, and makes it easy to use a portion of the jetted oil for lubrication and cooling of the planetary gear mechanism. .

  Further, when the oil passage hole is formed so as to penetrate at least a part of the partition wall facing the oil outlet at a position vertically above the rotation center axis of the sun gear, The cooling oil can be sufficiently supplied to the upper side in the vertical direction, and the stator can be efficiently cooled by utilizing the oil flow action.

  In addition, any one rotating element of the ring gear, the sun gear, and the carrier is connected to the rotor of the electric motor, and other rotating elements other than the one of the ring gear, the sun gear, and the carrier If it is the structure which outputs rotational driving force to the drive wheel of a vehicle, it will become a drive device which can cool an electric motor favorably, using it for the driving drive of a vehicle. In addition, if the rotation from the engine mounted on the vehicle is input to either the sun gear or the carrier, the hybrid drive device can be used to cool the electric motor well while being used for driving the vehicle.

  According to the present invention, oil is ejected from the oil ejection portion of the rotating element located in the vicinity of the stator of the electric motor in the planetary gear mechanism, and the oil flow direction is deflected radially outward by centrifugal force, and the oil Is supplied to the stator of the motor through the oil passage hole in the partition wall, so that cooling oil can be supplied to the stator of the motor without being affected by the operating state of other hydraulic operating devices and the motor. Provided is a drive device that can supply the cooling oil and can simplify the cooling oil passage structure for supplying the cooling oil to the stator side, and can sufficiently suppress energy loss for supplying the cooling oil. Can do.

It is a schematic sectional drawing of the drive device which concerns on one Embodiment of this invention. It is a partial expanded sectional view of the drive device shown in FIG. It is a schematic front view of the gear transmission mechanism of the drive device which concerns on one Embodiment of this invention. It is a schematic back view of the gear transmission mechanism of the drive device which concerns on one Embodiment of this invention.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
1 to 4 show a driving apparatus according to an embodiment of the present invention. In this embodiment, the present invention is applied to a part of a hybrid drive device mounted on a so-called FR (front engine / rear drive) hybrid vehicle.

  First, the configuration will be described.

  As shown in FIGS. 1 and 2, the vehicle drive device 1 of the present embodiment includes a case 10 having a partition wall 11 that divides the interior into at least two chambers, and a front surface side (one surface side) of the partition wall 11. Generator motor 20 (electric motor) positioned at the rear, a gear transmission mechanism 30 positioned on the rear surface side (other surface side) of the partition wall 11, and a rotary input shaft 15 penetrating through the central portion of the generator motor 20.

  Although not shown in its entirety, the case 10 is a part of the case of the hybrid drive device, and integrally fastens a plurality of bottomed cylindrical case members 12 and 13 having a shaft hole formed in the center. Configured. And the bottom wall part of one case member 12 becomes the partition part 11, the electric motor storage chamber 16 is formed on one side of the partition part 11, and the transmission mechanism storage chamber 17 is formed on the other side of the partition part 11, respectively. Has been.

  An engine (internal combustion engine) (not shown) is fastened to the front side (left side in FIG. 1) of the case 10, and the rotary input shaft 15 is connected to a rotary damper mechanism (not shown) or further on the front end side of one case member 12. It is connected to a rotating element on the engine side via a clutch mechanism.

  The generator motor 20 includes a stator 21 fixed inside the case 10 so as to be located on one surface side of the partition wall 11, in this embodiment, the front surface side, and a rotor 22 that rotates with respect to the stator 21. The generator motor 20 has both the function of a motor that selectively generates auxiliary or main driving force of the vehicle and the function of a generator that regenerates the inertial force of the vehicle as electric energy when braking the vehicle. is doing.

  The stator 21 is obtained by winding a stator coil 24 around a substantially annular stator core 23 constituting a main portion thereof, as indicated by a thin phantom line in FIG. These fastening bolts are fastened and fixed to the case 10. Here, the stator core 23 is composed of, for example, a plurality of divided cores 23p adjacent to each other in the rotation direction of the rotor 22, and a circular yoke portion 23a formed by laminating a plurality of electromagnetic steel plates (without symbols) and a stator coil 24 are wound. A plurality of teeth portions 23b. The rotor 22 has a rotor body 22a formed by laminating a plurality of electromagnetic steel plates and a plurality of permanent magnets 22b (only one is shown in FIG. 1) mounted at predetermined intervals in the circumferential direction. (Only one of them is shown in FIG. 1) is rotatably supported by the case 10.

  The gear transmission mechanism 30 is composed of a planetary gear mechanism, and, as will be described later, two rotating elements connected to the rotary input shaft 15 and the rotor 22 of the generator motor 20 and one fixed fixed to the case 10. And have elements. The gear transmission mechanism 30 functions as a power split mechanism that allows a part of the rotational power from the rotary input shaft 15 to be input to the generator motor 20 side, while the rotational power from the generator motor 20 is not shown in the subsequent stage. It can be output to the mechanism.

  Specifically, the gear transmission mechanism 30 includes an internal ring gear 31 as a fixed element supported by the case 10 so as to be positioned on the other surface side of the partition wall 11, and a rotor of the generator motor 20 at the center of the ring gear 31. 22, a plurality of, for example, three pinions 33 (pinion gears; see FIG. 3) meshing with the ring gear 31 and the sun gear 32, and a plurality of pinions 33. Are rotated to the case 10 via a bearing 76 so as to be revolved around a rotation center axis C of the sun gear 32 and supported by a bearing 33a (for example, a needle bearing) provided on each inner peripheral portion. And a carrier 34 (a rotating element in the vicinity of the stator) supported in a possible manner.

  The ring gear 31 has a flangeless structure composed of only an annular portion, and has a fitting portion 31 a that is spline-fitted to the case 10 on the outer peripheral portion thereof, and is prevented from coming off by a snap ring 81. The sun gear 32 has a spline fitting portion 32t that is spline fitted to the inner peripheral portion of the rear end of the rotor 22 on the outer peripheral portion of the cylindrical portion 32a protruding forward. Further, the sun gear 32 is rotatably supported on the outer peripheral portion of the rotary input shaft 15 via a plurality of bushes 77. Although the ring gear 31, the sun gear 32, and the pinion 33 are shown as spur gears in FIG. 1, they are constituted by helical gears. A thrust washer 82 is interposed between the case 10 and the front end of the ring gear 31. A thrust bearing 83 is provided between the case 10 and the sun gear 32, and a thrust bearing 84 is provided between the sun gear 32 and the carrier 34. Are intervened. Further, a thrust washer 85 is interposed between the carrier 34 and the inner ring 76 a of the bearing 76.

  As shown in FIGS. 1 to 3, the carrier 34 integrally couples a plurality of, for example, three pinion shafts 35 (oil ejection portions) that rotatably support the pinion 33 and the right end portions of these pinion shafts 35 in the drawing. The carrier body 36 having a flange portion 36a and a cylindrical tubular portion 36b, and a plate portion 37 that integrally connects the left end portions of the pinion shaft 35 in the figure and is connected to the flange portion 36a. . Here, the cylindrical portion 36b of the carrier body 36 is formed integrally with an output shaft 41 that outputs rotational power to the input shaft (rotating element on the drive wheel side) of the rear transmission mechanism.

  A parking lock gear 38 is attached to the outer periphery of the flange portion 36 a of the carrier body 36. The parking lock gear 38 constitutes a part of the parking lock mechanism 39 that operates a lock claw (not shown) via the lock operation members 39a and 39b, and regulates the rotation of the output shaft 41 when engaged with the lock claw. The output shaft 41 is allowed to rotate when the lock claw is released.

  An inner peripheral spline fitting portion 41t that is spline fitted to the rear end portion of the rotary input shaft 15 is provided on the inner peripheral portion of the front end side of the output shaft 41 that is integrally connected to the cylindrical portion 36b of the carrier body 36. ing. The output shaft 41 is connected to the input shaft of the transmission mechanism on the rear stage side on the rear end side. The output shaft 41 is input to the rear transmission mechanism by the rotational power input from the rotational input shaft 15 to the carrier 34 and the rotational power input from the generator motor 20 to the carrier 34 via the gear transmission mechanism 30. The shaft can be driven. Further, the output shaft 41 can transmit torque from the input shaft of the rear transmission mechanism to the carrier 34 when the regenerative brake is operated, and can cause the generator motor 20 to generate electric power via the gear transmission mechanism 30. .

  In the present embodiment, as described above, the sun gear 32 that is one of the ring gear 31, the sun gear 32, and the carrier 34 is connected to the rotor 22 of the generator motor 20, and the ring gear 31, the sun gear 32, and the carrier 34. Among them, a carrier 34 that is a rotating element other than the sun gear 32 is connected to an output shaft 41 that outputs a rotational driving force to a driving wheel of the vehicle so as to transmit power. In the present embodiment, since the ring gear 31 is a fixed element, rotation from the engine mounted on the vehicle is input to the carrier 34 which is one of the sun gear 32 and the carrier 34 which are rotating elements. . In the present embodiment, the ring gear 31 is a fixed element, but the ring gear 31 is not a fixed element but a rotating element, and the output shaft 41 is disposed so as to surround the outer periphery of the cylindrical portion 36b of the carrier body 36. You may make it connect with the ring gear 31 as a rotation element. In that case, it is also possible to change the output rotation speed of the output shaft 41 by changing the rotation speed of the rotor 22 of the generator motor 20 with respect to the rotation from the engine input to the rotation input shaft 15.

  On the other hand, the drive device 1 is equipped with a cooling mechanism 50 that lubricates and cools the gear transmission mechanism 30 of the stator 21 of the generator motor 20 with oil (cooling fluid) that lubricates and cools the inside of the case 10.

  The cooling mechanism 50 includes an oil pump 51 as oil supply means, an oil introduction passage 52 as an oil passage formed at the center of the rotary input shaft 15, and a radial direction (radial direction) from the oil introduction passage 52. And a plurality of oil passages 53, 54 extending to).

  The oil pump 51 pumps up oil from an oil pan (not shown) installed in the lowermost part of the transmission case including the case 10 or an inner bottom of a chamber in the transmission case, and pressurizes the oil into the oil passage 54. Is to be discharged. The oil pump 51 is constituted by, for example, an electric oil pump, and is controlled by an electronic control unit (hereinafter referred to as ECU) (not shown). The oil pump 51 may be configured by using a mechanical oil pump such as a gear pump and a valve for controlling the supply of oil.

  The oil passage 53 includes a plurality of radial passage portions 56 formed at equal angular intervals so as to extend radially outward from the oil introduction passage portion 52 in the rotary input shaft 15 inside the sun gear 32, and these radial passages. A plurality of root penetration paths 57 formed at equal angular intervals in the radial direction at specific positions in the rotational axis direction of the sun gear 32 corresponding to the portions 56, and an annular gap between the rotary input shaft 15 and the sun gear 32. And an annular passage portion 58 partitioned from the outside by a plurality of bushes 77. This oil passage 53 is a lubricating oil passage that supplies oil from the oil introduction passage portion 52 in the rotary input shaft 15 to the meshing portion of the sun gear 32 and the plurality of pinions 33, and the rotation and revolution of the pinion 33 Thus, the meshing portion between the pinion 33 and the ring gear 31 can be lubricated.

  As shown in FIG. 2 to FIG. 4, the oil passage 54 has a plurality of radiations formed through the rotation input shaft 15 at an equal angular interval so as to extend radially outward from the oil introduction passage portion 52 inside the carrier 34. Direction passage portions 61 and a plurality of first passage portions 62 (first oil passage portions) formed at equal angular intervals in the radial direction at specific positions in the rotation axis direction of the carrier 34 corresponding to the radial passage portions 61. A second passage portion 63 (second oil passage portion) passing through the central portion of the pinion shaft 35 in the axial direction, a radial direction from the second passage portion 63 toward the bearing 33a of the inner peripheral portion of the pinion 33, and the like. An oil passage for gear lubrication and motor cooling constituted by a plurality of third passage portions 64 extending at angular intervals. The oil passage 54 supplies oil from the oil introduction passage portion 52 in the rotary input shaft 15 to the rolling portion of the bearing 33 a on the inner peripheral portion of the pinion 33.

  On the other hand, the second passage portion 63 of the oil passage 54 has an oil outlet 63a (an outlet) for jetting oil toward the stator coil 24 of the generator motor 20 in the vicinity of the end of the pinion shaft 35 on the generator motor 20 side. Have. That is, the pinion shaft 35 of the carrier 34 serves as an oil ejection portion that ejects oil from the oil ejection port 63a in the vicinity of one end portion (hereinafter also referred to as a front end portion) on the generator motor 20 side toward the generator motor 20 side. Yes. Note that an orifice 35 f is provided at the front end portion of the pinion shaft 35 to narrow the oil outlet 63 a to a smaller cross-sectional area than the passage cross-sectional area of the second passage portion 63.

  Further, the partition wall 11 of the case 10 communicates with the two chambers on both sides thereof, that is, the motor housing chamber 16 and the transmission mechanism housing chamber 17, and the oil ejected from the oil ejection port 63 a of the pinion shaft 35 is generated by the generator motor 20. At least one oil passage hole 66 that allows passage toward the stator 21 is formed.

  As shown in FIGS. 1 and 3, the oil passage hole 66 is formed on the partition wall 11 facing the oil jet port 63 a at least vertically above the rotational center axis C of the sun gear 32 (upper side in FIG. 3). For example, a plurality of arc grooves or circular holes are formed so as to penetrate a part, and in the present embodiment, a part of the plurality of oil passage holes 66 may be vertically below the rotation center axis of the sun gear 32. A part of the partition wall 11 is penetrated.

  The carrier 34 is equipped with a flow restricting member 67 that restricts the flow direction of oil to a specific flow direction toward the stator 21 in the vicinity of the oil outlet 63a.

  As shown in FIGS. 2 and 3, the flow restricting member 67 includes a fixed plate portion 67a fixed in parallel to the plate portion 37 of the carrier 34, and a stator coil of the stator 21 of the generator motor 20 from the fixed plate portion 67a. It is comprised by the cyclic | annular body which consists of the inclination board part 67b extended toward 24 coil end parts 24a. Further, the inclined plate portion 67 b of the flow restricting member 67 is arranged so as to always maintain a constant gap with respect to the partition wall portion 11 when rotating together with the carrier 34. The flow restricting member 67 restricts the flow of oil ejected from all of the plurality of oil ejection ports 63a in the direction toward the coil end portion 24a of the stator coil 24, but is ejected from each oil ejection port 63a. It may be configured by a pipe or the like that directs the flow of oil to be directed in a direction toward the coil end portion 24 a of the stator coil 24.

  The carrier 34 is further provided with an annular deflecting member 68 that deflects the flow direction of the oil ejected radially outward from the first passage portion 62 of the oil passage 54 toward the second passage portion 63.

  As shown in FIGS. 2 and 4, the deflecting member 68 includes an annular fixed plate portion 68 a fixed in parallel to the back side of the flange portion 36 a of the carrier body 36 of the carrier 34, and a rotation center axis C of the carrier 34. From the first passage portion 62 in the direction of the rotation center axis of the carrier 34. The radius of the second passage portion 63 is smaller than the radius of revolution of the pinion 33, and is separated from the flange portion 36a of the carrier body 36 in parallel. 1 is fixed at two radial positions which are at a fixed inclination angle with respect to the rotation center axis C of the carrier 34 and deviate from the revolution radial position of the pinion 33, and located on the right side (rear side) in FIG. It is comprised by the inclination board part 68c which connects the board part 68a and the cyclic | annular board part 68b.

  As described above, in the present embodiment, the carrier 34 has the oil passage 54 that guides the oil to the oil outlet 63a on one end side of the pinion shaft 35 while flowing the oil in the direction away from the rotation center line. The first passage portion 62 and the deflection member 68 of the oil passage 54 are respectively disposed on the other end side of the pinion shaft 35.

  The operation of the driving device 1 is comprehensively controlled by the ECU in accordance with the traveling state of the vehicle and the requested operation input from the driver (for example, range switching request operation, acceleration request, deceleration request, etc.). The other generator motors in the hybrid drive device are controlled by the ECU, each of which is operated by a motor or a generator, and the operating conditions thereof.

  Further, the ECU determines whether the heat generation amount of the generator motor 20 is larger than a heat generation amount value set in advance, or calculates the heat generation amount, so that the oil pump according to the heat generation amount. The number of revolutions or the discharge capacity of the oil pump 51 is controlled so that the required amount of cooling is performed by changing the oil discharge amount from the oil pump 51. Further, the operation or stop of the engine and the operating conditions during the operation are controlled by an engine ECU that cooperates with the ECU that performs overall control of the drive device 1.

  Next, the operation will be described.

  In the drive device 1 of the present embodiment configured as described above, the carrier 34 serving as the rotating element of the planetary gear mechanism is driven by at least one of the rotational power from the engine and the rotational power from the generator motor 20. When rotating, the oil pump 51 is actuated, and oil is ejected from the oil outlet 63 a at the front end of the pinion shaft 35 of the carrier 34.

  At this time, the oil is ejected from the oil ejection port 63a while receiving centrifugal force by the rotation of the carrier 34, and immediately after the ejection, the flow direction of the oil is deflected outwardly of the carrier 34 by centrifugal force. The oil passes through an oil passage hole 66 formed in the partition wall 11 and is supplied as a coolant to the stator 21 of the generator motor 20. At this time, the oil flows in a direction away from the rotation center line of the carrier 34 in the first passage portion 62 of the oil passage 54, so that the oil is discharged from the oil outlet 63a by the hydraulic component based on the centrifugal force at that time. The eruption can be promoted.

  Therefore, the stator 21 of the generator motor 20 is cooled without being affected by other hydraulic pressure devices (not shown), the generator motor 20 or the operating conditions of the other motors installed in the rear transmission or the like. Oil can be supplied. In addition, since the oil passage for supplying the cooling oil to the stator 21 side is constituted by the oil passage 54 formed of two linear passages of the first passage portion 62 and the second passage portion 63, the oil passage Since the oil passage structure for supply becomes very simple and the flow of oil in the oil passage 54 is only promoted by centrifugal force, a large energy loss for supplying cooling oil to the carrier 34 occurs. There is nothing.

  In the present embodiment, since the carrier 34 has the oil outlet 63a in the vicinity of the end of the pinion shaft 35, cooling is performed using the second passage portion 63 that is an oil passage for bearing lubrication and cooling of the pinion 33. Therefore, the oil can be supplied to the stator 21 side, and the oil passage structure can be further simplified.

  Further, since the annular flow restricting member 67 is attached to the carrier 34 for the oil ejected from the plurality of oil ejection ports 63a, the oil ejected from the plurality of oil ejection ports 63a is supplied to the coil of the stator coil 24 of the stator 21. It is possible to efficiently supply the end portion 24a and the like.

  In addition, since the first passage portion 62 and the second passage portion 63 of the oil passage 54 can be respectively straightened, the processing of the oil passage 54 with respect to the carrier 34, that is, the processing of the first passage portion 62 and the second passage portion 63 is easy. Can be

  In addition, since the deflecting member 68 capable of deflecting the flow direction of the oil from the first passage portion 62 is attached to the carrier 34, the axis of the first passage portion 62 and the axis of the second passage portion 63 are in the rotation direction. They can be shifted, increasing the degree of freedom in design. In particular, in the present embodiment, since the annular deflecting member 68 is mounted, the oil from the first passage portion 62 is surely captured, and the hydraulic pressure required to eject the oil from the plurality of oil ejection ports 63a is centrifuged. It can be generated evenly and stably by hydraulic pressure.

  In the present embodiment, the oil outlet 63a is further formed on one end side of the pinion shaft 35, and the first passage portion 62 and the deflection member 68 of the oil passage 54 are disposed on the other end side of the pinion shaft 35. In addition, another member that forms the oil passage 54, for example, a ring gear flange, is not necessary on one end side of the pinion shaft 35, and the oil outlet 63a can be disposed at a position close to the stator 21 of the generator motor 20 and A part of the gear transmission mechanism 30 can be easily used for lubrication and cooling.

  In addition, since the oil passage hole 66 passes through a part of the partition wall 11 facing the oil jet port 63a at least vertically above the rotation center axis C of the sun gear 32, the oil passage hole 66 is cooled above the stator 21 in the vertical direction. Therefore, the stator 21 can be efficiently cooled by utilizing the oil flow action.

  Therefore, the drive device 1 is a hybrid drive device that can cool the generator motor 20 satisfactorily while being used for driving the vehicle.

  As described above, according to the present embodiment, oil is ejected from the oil outlet 63a of the carrier 34 located in the vicinity of the stator 21 of the generator motor 20, and the flow direction of the oil is deflected radially outward by centrifugal force. However, since it passes through the oil passage hole 66 of the partition wall 11 and is supplied to the stator coil 24 of the stator 21, the stator 21 is not affected by the operating conditions of other hydraulic operating devices and the generator motor 20. The cooling oil passage structure for supplying the cooling oil to the stator 21 and the cooling oil passage to the stator 21 can be very simply configured using the gear lubricating oil passage. In addition, since the oil does not need to be pumped up and the flow in the oil passage 54 in the oil supply direction is promoted by centrifugal force, the cooling mechanism 50 reduces the energy loss for supplying the cooling oil. It can be suppressed sufficiently.

  In the above-described embodiment, the rotating element in the vicinity of the stator of the electric motor is the carrier 34, but a ring gear as a rotating element is provided instead of a fixed element such as the ring gear 31, and the output shaft 41 is the carrier body 36. When the flange portion is disposed so as to surround the outer periphery of the cylindrical portion 36b and is connected to the ring gear as the rotation element, the ring gear can be a rotation element in the vicinity of the stator. That is, when the ring gear has an inner flange portion on the end side away from the electric motor and an output member is connected thereto, an oil passage such as an oil passage 54 is formed in the ring gear, and the inner flange portion of the ring gear It is also conceivable to attach a deflecting member 68 to the back side of the lens. Also, depending on the size relationship between the planetary gear mechanism and the electric motor, it may be possible to form an oil jet on the side of the sun gear. Of course, even when the ring gear or sun gear is located near the stator, a simple cooling oil passage structure using the existing gear lubrication oil passage formed on the plurality of pinion shaft portions of the carrier is used. Is preferred.

  In the above-described embodiment, the cooling mechanism 50 injects oil to the coil end portion 24 a (end surface portion) of the stator coil 24 of the stator 21 of the generator motor 20. It goes without saying that oil may be directly applied to the inner peripheral part or / and the outer peripheral part.

  In the above-described embodiment, the flow restricting member 67 is an annular body, but may be a plurality of substantially fan-shaped or pipe-type flow restricting members corresponding to the plurality of oil jets 63a. Similarly, a plurality of substantially fan-shaped or pipe-shaped (funnel-shaped) deflecting members corresponding to the plurality of first passage portions 62 may be used instead of the annular deflecting member 68.

  Furthermore, although the oil passage holes 66 are each formed in an arcuate opening shape, they may be circular or other non-circular shapes. That is, if there is sufficient strength required to support the rotor 22 and the sun gear 32 via the bearings, the shape of the oil passage hole 66 formed in the partition wall portion 11 is arbitrary, and a plurality of rotation elements in the rotational direction of the rotating element are provided. The intervals of the oil passage holes 66 may be not equal intervals but unequal intervals.

  In the above-described embodiment, the present invention is applied to a vehicle drive device mounted on an FR hybrid vehicle. However, an FF hybrid vehicle or a rear wheel based on the FF hybrid vehicle is used when necessary. The present invention can also be applied to a drive device of a four-wheel drive vehicle (all-wheel drive vehicle) driven by a motor, and can also be applied to an in-wheel motor type drive device including an electric motor and a reduction gear.

  Needless to say, the planetary gear mechanism according to the present invention may be any one of a power split mechanism, a speed reduction mechanism, and a speed change mechanism.

  As described above, the drive device according to the present invention ejects oil from the oil ejection portion of the rotating element located in the vicinity of the stator of the electric motor in the planetary gear mechanism, and the oil flows out of the flow direction by centrifugal force. Since it is supplied to the stator of the motor through the oil passage hole in the partition wall while being deflected in the direction of cooling, it is cooled to the stator of the motor without being affected by other hydraulic operating devices and the operating state of the motor. A driving device that can supply oil for cooling, can simplify the cooling oil passage structure for supplying the cooling oil to the stator side, and can sufficiently suppress energy loss for supplying cooling oil The gear transmission mechanism is connected to the rotor of the electric motor and the stator of the electric motor is cooled with oil. It is useful in a suitable driving devices in general the travel drive of both.

DESCRIPTION OF SYMBOLS 1 Drive apparatus 10 Case 11 Partition part 15 Rotation input shaft (input member, engine-side rotation shaft)
16 Electric motor storage room 17 Transmission mechanism storage room 20 Generator motor (electric motor)
21 Stator 22 Rotor 24 Stator Coil 24a Coil End Part 30 Gear Transmission Mechanism (Planetary Gear Mechanism)
31 Ring gear 32 Sun gear (rotating element)
33 Pinion (pinion gear)
34 Carrier (rotating element near the stator)
35 Pinion shaft 36 Carrier body 36a Flange 41 Output shaft (output member)
41t Inner peripheral spline fitting portion 50 Cooling mechanism 51 Oil pump 52 Oil introduction passage portion 53 Oil passage (lubricating oil passage)
54 Oil passage (oil passage for gear lubrication and motor cooling)
61 Radial passage part 62 First passage part 63 Second passage part 63a Oil outlet (outlet)
64 Third passage 66 Oil passage hole 67 Flow restricting member 68 Deflection member C Center axis of rotation

Claims (4)

A case having a partition portion that divides the interior into two chambers, a motor that is located inside the case and located on one side of the partition portion, and a rotor that rotates relative to the stator; and an interior of the case. A gear transmission mechanism positioned on the other surface side of the partition wall, and a cooling mechanism for cooling the electric motor with oil, the gear transmission mechanism including a ring gear and a sun gear disposed at the center of the ring gear; A planetary gear mechanism having a pinion gear meshing with the sun gear and the ring gear, and a carrier that rotatably supports the pinion gear and revolves the pinion gear,
The cooling mechanism is
An oil ejection portion provided on a rotating element in the vicinity of the stator among the ring gear, the sun gear, and the carrier, for ejecting the oil toward the electric motor;
An oil passage hole formed to communicate the two chambers with the partition wall of the case and allowing the oil ejected from the oil ejecting portion to pass toward the stator of the electric motor. To drive. The rotating element in the vicinity of the stator is the carrier;
2. The drive device according to claim 1, wherein the carrier has an ejection port that ejects the oil in the vicinity of an end portion of a pinion shaft that supports the pinion so as to rotate.   The drive device according to claim 2, wherein a flow restricting member that restricts a flow direction of the oil to a specific flow direction toward the stator in the vicinity of the ejection port is attached to the carrier.   4. The drive device according to claim 2, wherein the carrier has an oil passage that guides the oil to the jet outlet while flowing the oil in a direction away from the rotation center line. 5.

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