JP2012076576A - Hybrid driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of expanding a dimension in the axial direction of the whole hybrid driving device.SOLUTION: In this hybrid driving device, the whole power distribution device PT is arranged in an overlapping shape in the axial direction of a distribution output member 21 inside in the radial direction of the distribution output member 21, and a ring gear R for constituting the power distribution device PT is integrally arranged with the distribution output member 21 on an inner peripheral surface 21b of the distribution output member 21. The hybrid driving device includes two output bearings 61 and 62 rotatably supporting the distribution output member 21. The two output bearings 61 and 62 are arranged inside in the radial direction of the distribution output member 21 and on both sides in the axial direction of the power distribution device PT. The distribution output member 21 is divided into a first divided member 31 integrally arranged with the ring gear R and a second divided member 32 between the ring gear R and the output bearing 62, and the first divided member 31 and the second divided member 32 are integrally rotatably engaged and are separably constituted.

Description

  The present invention relates to a hybrid drive device including an input member drivingly connected to an engine, a rotating electrical machine, and a power distribution device that distributes and transmits torque of the input member to the rotating electrical machine and a distribution output member. .

  As such a hybrid drive device, for example, a device described in Patent Document 1 below is already known. In the device described in Patent Document 1, as shown in FIGS. 2 and 4 of Patent Document 1, the ring gear (R) serving as the output rotation element of the power distribution device (planetary gear unit 13) is cylindrical. The distribution output member is integrally formed with the distribution output member on the inner peripheral surface of the distribution output member, and the distribution output member is a sleeve-shaped member (output shaft 14) formed so as to surround the input member (output shaft 12). ) Through a flange-like connecting member extending in the radial direction. The sleeve-like member is arranged on the engine side and radially inward in the axial direction with respect to the distribution output member, and a counter drive gear (15) as an output gear is provided at the end of the sleeve-like member in the axial direction on the engine side. It is formed on the outer peripheral surface of the sleeve-like member.

  Since the rotor and the distribution output member of the rotating electrical machine (generator motor 16), which are rotating members in the case (10), need to be supported rotatably with respect to non-rotating members such as the case, these are respectively It is supported by a rotor bearing and an output bearing. Here, in the hybrid device described in Patent Document 1, an output bearing is disposed between the case and the sleeve-like member, and a rotor bearing is disposed between the case and the rotor shaft of the rotating electrical machine. The distribution output member is connected to the rotor shaft of the rotating electrical machine via a ring gear formed integrally with the distribution output member and other rotating elements of the power distribution device, and is connected to the sleeve-like member via the connection member. Has been. Thereby, the distribution output member is rotatably supported by the case via the rotor shaft and the rotor bearing of the rotating electrical machine, and the sleeve-like member and the output bearing. At this time, since the output bearing is disposed in contact with the outer peripheral surface of the sleeve-shaped member having a relatively small diameter, the output bearing having a relatively small diameter can be used, thereby reducing the cost of the output bearing and hybrid driving. It is possible to reduce the manufacturing cost of the entire apparatus.

JP 2000-217205 A

  However, in the hybrid drive device described in Patent Document 1, the rotor bearing and all the output bearings are arranged at different positions in the axial direction with the power distribution device interposed therebetween. With such an arrangement, the rotating electrical machine, the power distribution device, and the output gear occupy a space over a wide range in the axial direction. Therefore, there has been a problem that the axial dimension of the entire hybrid drive device is enlarged.

  Therefore, it is desired to realize a hybrid drive apparatus that can shorten the axial dimension of the entire apparatus.

  According to the present invention, a hybrid drive apparatus comprising: an input member that is drivingly connected to an engine; a rotating electrical machine; and a power distribution device that distributes and transmits torque of the input member to the rotating electrical machine and a distribution output member. The entire structure of the power distribution device is arranged in the radial direction of the distribution output member so as to overlap with the distribution output member in the axial direction, and the ring gear constituting the power distribution device and having internal teeth includes: Provided integrally with the distribution output member on the inner peripheral surface of the distribution output member, and includes two output bearings rotatably supporting the distribution output member, the two output bearings having a diameter of the distribution output member The distribution output member is disposed on the inner side in the direction and on both axial sides of the power distribution device, and the distribution output member is a first in which the ring gear is integrally provided between the ring gear and one of the output bearings. And split member is divided into a second dividing member, the and the first divided member and the second divided member, together with the engaged to rotate integrally, in that it is detachably configured.

  In the present application, “driving connection” refers to a state where two rotating elements are connected so as to be able to transmit a driving force, and the two rotating elements are connected so as to rotate integrally, or It is used as a concept including a state in which two rotating elements are connected so as to be able to transmit a driving force via one or more transmission members. Examples of such a transmission member include various members that transmit rotation at the same speed or a variable speed, and include, for example, a shaft, a gear mechanism, a belt, a chain, and the like. In addition, as such a transmission member, an engagement element that selectively transmits rotation and driving force, such as a friction clutch or a meshing clutch, may be included.

  Further, in the present application, the “rotary electric machine” is used as a concept including any of a motor (electric motor), a generator (generator), and a motor / generator functioning as both a motor and a generator as necessary.

  Furthermore, in the present application, “overlapping in the axial direction” means that at least a part of two objects (members) are located at the same position with respect to the arrangement in the axial direction, in other words, a part overlapping in the radial direction. That is, when the viewpoint is moved in each direction orthogonal to the line-of-sight direction with the radial direction as the line-of-sight direction, the viewpoint that two objects (members) appear to overlap is present in at least a part of the region. Point to.

  According to the above characteristic configuration, the entire power distribution device is arranged in the radial direction inside the distribution output member so as to overlap the distribution output member in the axial direction, so that the distribution output member occupies the space occupied in the axial direction. A power distribution device can be arranged. Therefore, the power distribution device can be housed in the space occupied by the distribution output member, and the axial length of the space occupied by the power distribution device and the distribution output member can be shortened.

  By the way, since the two output bearings are arranged on the radially inner side of the distribution output member and on both axial sides of the power distribution device, when the distribution output member is a single body, the two output bearings , And at least a part of the power distribution device must be assembled to the distribution output member in advance. Therefore, when assembling to the device, it may be necessary to perform fitting at a plurality of locations at the same time, which may hinder the ease of assembly.

  However, in the above characteristic configuration, the distribution output member is divided into the first divided member and the second divided member between the ring gear and the one output bearing. Therefore, the two output bearings are provided separately for the first divided member and the second divided member, respectively. And since the 1st division member and the 2nd division member are engaged so that it may rotate integrally, and it is constituted so that separation is possible, the fitting part of a plurality of places provided in the distribution output member, The first divided member, the power distribution device and the sub-assembly made up of one output bearing and the sub-assembly made up of the second divided member and the other output bearing can be separately assembled into the device. Moreover, after the assembly, the planetary gear in the power distribution device can be exchanged by simply removing one of the divided members. As mentioned above, according to said characteristic structure, while being able to shorten the axial direction dimension of the whole apparatus, the assembly | attachment ease and maintenance of an apparatus can be improved.

  Here, a first engaging portion that is an engaging portion with the second divided member is provided on an inner peripheral surface of the first divided member, and the first divided member is provided on an outer peripheral surface of the second divided member. A second engagement portion that is an engagement portion between the second engagement portion and the second engagement portion. It is preferable that the configuration is arranged.

  According to this configuration, the first divided member and the second divided member can be connected so as to rotate integrally only by engaging the first engaging portion and the second engaging portion. In addition, the second engagement portion is arranged on the radially inner side with respect to the first engagement portion of the first split member provided with the ring gear on the inner peripheral surface, thereby overlapping with the ring gear when viewed in the axial direction. A 2nd engaging part can be arrange | positioned in a position. Therefore, the radial size of the hybrid drive device is larger than that in which the second engagement portion is disposed radially outward with respect to the first engagement portion of the first split member whose outer diameter is determined by the diameter of the ring gear. It is easy to keep the value small.

  Each of the first engagement portion and the second engagement portion includes spline teeth that engage with each other, and at least one of the spline teeth of the first engagement portion and the second engagement portion is It is preferable that the entire overlapping region in the axial direction between the first engaging portion and the second engaging portion is cut out.

  According to this structure, these can be spline-engaged so that a 1st division member and a 2nd division member may rotate integrally. Moreover, the oil inside the distribution output member can be discharged to the outside of the distribution output member through the portion where the spline teeth are cut off. That is, the oil discharge path inside the distribution output member can be formed by a simple method of cutting off the spline teeth. Thereby, the drag resistance of oil in the gear of the power distribution device arranged inside the distribution output member can be reduced.

  Moreover, the 1st fitting part which is a fitting part with said 2nd divided member is provided in the internal peripheral surface of said 1st divided member, and said 1st divided member is provided in the outer peripheral surface of said 2nd divided member. A second fitting portion that is a fitting portion of the second fitting portion, and the first fitting portion is disposed so as to overlap the second fitting portion in the axial direction, and is radial with respect to the second fitting portion. It is preferable to adopt a configuration in which they are fitted in the radial direction while being in contact from the outside.

  According to this structure, the axial center precision of a 1st division member and a 2nd division member can be improved. Thereby, the backlash at the time of the rotation by axial center shift | offset | difference is suppressed, and generation | occurrence | production of the noise sound accompanying wear of a division member and backlash can be reduced.

  Further, an output gear having external teeth is integrally provided on the outer peripheral surface of the first split member, and the output gear is arranged on the outer side in the radial direction of the ring gear so as to overlap the ring gear in the axial direction. A configuration is preferable.

  According to this configuration, the axial length of the space occupied by the ring gear and the output gear can be shortened. Therefore, the axial length of the hybrid drive device can be kept short.

FIG. 3 is a cross-sectional view taken along a plane orthogonal to the axial direction of the hybrid drive device according to the embodiment of the present invention. It is a skeleton figure of the hybrid drive device concerning the embodiment of the present invention. FIG. 4 is a sectional view of a missing tooth portion of the hybrid drive device according to the embodiment of the present invention. It is an exploded view of the hybrid drive device concerning the embodiment of the present invention.

  Embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the hybrid drive device 1 according to the present invention is a drive device for a hybrid vehicle that can travel using both the engine E and the rotating electrical machines MG1 and MG2 as driving force sources. The hybrid drive device 1 according to the present embodiment is arranged adjacent to the engine E placed horizontally in the vehicle in the width direction of the vehicle and connected in the axial direction of the engine output shaft Eo of the engine E. , A hybrid drive device for FF (Front Engine Front Drive) vehicles.

  The hybrid drive device 1 is configured as a so-called two-motor split type hybrid drive device. The hybrid drive device 1 distributes the torque of the engine E transmitted to the input shaft I and the first rotating electrical machine MG1 to the input shaft I that is drivingly connected to the engine E, the first rotor Ro1. And a power distribution device PT that distributes and transmits to the output member 21. In such a configuration, the hybrid drive device 1 according to the present embodiment is characterized in that the arrangement configuration of the power distribution device PT and the distribution output member 21 and the distribution output member 21 are configured to be separable into two. Have.

  More specifically, as shown in FIG. 1, the entire power distribution device PT overlaps the distribution output member 21 in the radial direction inside the distribution output member 21 in the axial direction (overlaps when viewed in the radial direction). A ring gear R having internal teeth is provided integrally with the distribution output member 21 on the inner peripheral surface 21 b of the distribution output member 21. The distribution output member 21 includes two output bearings 61 and 62 that rotatably support the distribution output member 21. These two output bearings 61 and 62 are arranged on the radially inner side of the distribution output member 21 and on both sides in the axial direction of the power distribution device PT. The distribution output member 21 is located between the ring gear R and one output bearing 62. Thus, the ring gear R is divided into a first divided member 31 and a second divided member 32 provided integrally. The combination of these characteristic configurations realizes the hybrid drive device 1 that shortens the axial dimension of the entire device and is excellent in ease of assembly and maintainability. Below, the hybrid drive device 1 which concerns on this embodiment is demonstrated in detail.

1. Overall Configuration of Hybrid Drive Device First, the overall configuration of the hybrid drive device 1 according to the present embodiment will be described. As shown in FIGS. 1 and 2, the input shaft I is drivingly connected to the engine E. Here, the engine E is an internal combustion engine that is driven by the combustion of fuel. For example, various known engines such as a gasoline engine and a diesel engine can be used. In this example, the input shaft I is drivably coupled to an engine output shaft Eo such as a crankshaft of the engine E via a damper D. A configuration in which the input shaft I is drive-coupled to the engine output shaft Eo via a clutch or the like in addition to the damper D or directly without the damper D or the clutch is also suitable. In the present embodiment, the input shaft I corresponds to the “input member” in the present invention.

  The first rotating electrical machine MG1 includes a first stator St1 fixed to the case 2 and a first rotor Ro1 that is rotatably supported on the radially inner side of the first stator St1. The first rotor Ro1 is drivingly coupled so as to rotate integrally with the sun gear S of the power distribution device PT. The first rotating electrical machine MG1 can perform a function as a motor (electric motor) that generates power upon receiving power supply and a function as a generator (generator) that generates power upon receiving power supply. It is said that. Therefore, the first rotating electrical machine MG1 is electrically connected to a power storage device (not shown). In this example, a battery is used as the power storage device. Note that it is also preferable to use a capacitor or the like as the power storage device. In this example, the first rotating electrical machine MG1 generates power by the torque of the input shaft I (engine E) mainly input via the power distribution device PT, charges the battery, or drives the second rotating electrical machine MG2. It functions as a generator that supplies power to However, the first rotating electrical machine MG1 may function as a motor that powers and outputs driving force when the vehicle is traveling at high speed or when the engine E is started. In the present embodiment, the first rotating electrical machine MG1 corresponds to the “rotating electrical machine” in the present invention.

  In the present embodiment, the “axial direction”, “radial direction”, and “circumferential direction” are defined with reference to the input shaft I arranged coaxially and the rotational axis of the rotating electrical machine MG1. Yes.

  In the present embodiment, the power distribution device PT is a single pinion type planetary gear mechanism arranged coaxially with the input shaft I. In other words, the power distribution device PT has three rotating elements: a carrier CA that supports a plurality of pinion gears, and a sun gear S and a ring gear R that mesh with the pinion gears. The sun gear S is drivingly coupled so as to rotate integrally with the first rotor shaft 60 of the first rotor Ro1 of the first rotating electrical machine MG1. The carrier CA is drivingly connected so as to rotate integrally with the input shaft I. The ring gear R is formed integrally with the distribution output member 21. These three rotating elements of the power distribution device PT are a sun gear S (first rotating element), a carrier CA (second rotating element), and a ring gear R (third rotating element) in the order of rotation speed. The “order of rotational speed” is either the order from the high speed side to the low speed side or the order from the low speed side to the high speed side, depending on the rotational state of the planetary gear mechanism constituting the power distribution device PT. In any case, the order of the rotating elements does not change.

  The power distribution device PT distributes and transmits the torque of the engine E transmitted to the input shaft I to the first rotating electrical machine MG1 and the distribution output member 21. In the power distribution device PT, the input shaft I is drivingly connected to a carrier CA that is intermediate in the order of rotational speed. In addition, the first rotor Ro1 of the first rotating electrical machine MG1 is drivingly connected to the sun gear S on one side in the order of rotational speed, and the ring gear R on the other side in the order of rotational speed is formed integrally with the distribution output member 21. Has been. In the hybrid drive device 1 according to the present embodiment, the forward torque of the engine E is transmitted to the carrier CA that is intermediate in the order of the rotational speed via the input shaft I, and one side in the order of the rotational speed. The negative torque output from the first rotating electrical machine MG1 is transmitted to the sun gear S via the first rotor shaft 60. The torque in the negative direction of the first rotating electrical machine MG1 functions as a reaction force receiver for the torque of the engine E, so that the power distribution device PT is one of the torques of the engine E transmitted to the carrier CA via the input shaft I. The portion is distributed to the first rotating electrical machine MG1, and the torque attenuated with respect to the torque of the engine E is transmitted to the distribution output member 21 via the ring gear R.

  An output gear 22 having external teeth is integrally provided on the outer peripheral surface 21 a of the distribution output member 21. The hybrid drive device 1 according to the present embodiment further includes a counter gear mechanism C and an output differential gear device DF. As shown in FIG. 2, the counter gear mechanism C transmits the torque output from the output gear 22 to the output differential gear device DF. The counter gear mechanism C is also drive-coupled to the second rotating electrical machine MG2, and the counter gear mechanism C also transmits the torque output from the second rotating electrical machine MG2 to the output differential gear device DF. The output differential gear device DF is drivingly connected to the wheel W via the output shaft O, and transmits the rotation and torque input to the output differential gear device DF to the wheel W.

  Here, the second rotating electrical machine MG2 fulfills a function as a motor (electric motor) that receives power supply to generate power and a function as a generator (generator) that generates power by receiving power supply. It is possible. Therefore, the second rotating electrical machine MG2 is also electrically connected to a battery as a power storage device. In this example, the second rotating electrical machine MG2 mainly functions as a motor that assists the driving force for running the vehicle. However, when the vehicle is decelerated, the second rotating electrical machine MG2 may function as a generator that regenerates the inertial force of the vehicle as electric energy.

2. Configuration of Each Part of Hybrid Drive Device Next, a mechanical configuration of each part of the hybrid drive device 1 according to the present embodiment will be described. The input shaft I, the first rotating electrical machine MG1, the power distribution device PT, the distribution output member 21, the output gear 22, and the counter gear mechanism C described above are accommodated in the case 2. As shown in FIG. 1, in the present embodiment, the case 2 has a case main body 2a and an axial first direction A1 side that is one axial direction of the case main body 2a (the right side in FIG. 1, the same applies hereinafter). A front cover 2b to be attached and a rear cover (not shown) attached to the second axial direction A2 side (the left side in FIG. 1, the same shall apply hereinafter), which is the other axial side of the case body 2a, can be divided. ing. These are fastened and fixed together using fastening members such as bolts.

  The case main body 2a mainly accommodates the first rotating electrical machine MG1. The accommodation space P formed between the case main body 2a and the front cover 2b mainly accommodates the input shaft I, the power distribution device PT, the distribution output member 21, the output gear 22, and the counter gear mechanism C. The The case body 2a includes a case peripheral wall 3 formed in a deformed cylindrical shape so as to cover at least the outer periphery of the first rotating electrical machine MG1, and an intermediate support wall 7 that closes an end opening on the axial first direction A1 side of the case peripheral wall 3. And. The case peripheral wall 3 and the intermediate support wall 7 are integrally formed. Further, the front cover 2b includes a partition wall 10 formed in a deformed cylindrical shape so as to cover at least the outer periphery of the power distribution device PT, the distribution output member 21, the output gear 22, and the counter gear mechanism C, and the partition wall 10 And an end support wall 4 that closes the end opening on the first axial direction A1 side. The partition wall 10 and the end support wall 4 are integrally formed.

  The end support wall 4 has a shape extending at least in the radial direction, and extends in the radial direction and the circumferential direction in the present embodiment. The end support wall 4 is formed with an axial through hole, and an input shaft I inserted through the through hole is inserted into the case 2 through the end support wall 4. The end support wall 4 includes a cylindrical (boss-shaped) axial projecting portion 5 projecting toward the second axial direction A2 around the input shaft I. Further, the end support wall 4 is a cylindrical shape (a boss shape) that also protrudes toward the second axial direction A2 side at a predetermined distance from the axial projection 5 on the radially outer side of the axial projection 5. ) In the axial direction. The axial protrusion 5 and the axial protrusion 6 are formed integrally with the end support wall 4.

  The intermediate support wall 7 has a shape extending at least in the radial direction, and extends in the radial direction and the circumferential direction in the present embodiment. The intermediate support wall 7 is formed with an axial through hole having a diameter larger than the outer diameter of the first rotor shaft 60 of the first rotating electrical machine MG1. A first rotor shaft 60 that is rotatably supported by the intermediate support wall 7 through the rotor bearing 63 is inserted into the through-hole, and the first rotor shaft 60 passes through the intermediate support wall 7 and is accommodated. In space P, it is connected to sun gear S of power distribution device PT. The edge of the through-hole provided in the intermediate support wall 7 is provided with a cylindrical (boss-shaped) axial protrusion 8 that protrudes toward the first axial direction A1. The axial protrusion 8 is formed integrally with the intermediate support wall 7. Therefore, in this example, the axial protrusion 5 and the axial protrusion 6 formed integrally with the end support wall 4 and the axial protrusion 8 formed integrally with the intermediate support wall 7 are: It arrange | positions so that it may mutually face in the accommodation space P. As shown in FIG.

  The input shaft I is a shaft for inputting the torque of the engine E into the hybrid drive device 1, and is connected to the engine E at the end portion on the first axial direction A1 side as shown in FIG. As shown in FIG. 1, the input shaft I is disposed in a state of penetrating the case 2, and the engine output of the engine E via the damper D on the axial first direction A1 side of the end support wall 4. The shaft Eo is connected to rotate integrally. The damper D is a device that transmits the rotation of the engine output shaft Eo to the input shaft I while attenuating torsional vibration of the engine output shaft Eo, and various known devices can be used. The input shaft I is supported by the axial projecting portion 5 of the end support wall 4 while being rotatable via the first needle bearing 69. Further, an oil seal 59 is arranged between the end support wall 4 and the input shaft I to suppress oil leakage to the first axial direction A1 side. In the present embodiment, the first rotor shaft 60 of the first rotating electrical machine MG1 is formed in a tubular shape having an axial through hole in the inner diameter portion, and the input shaft I is inserted into the through hole of the first rotor shaft 60. The end of the second axial direction A2 side is inserted. At this time, the input shaft I is supported by the first rotor shaft 60 in a rotatable state via the second needle bearing 70.

  The first rotor shaft 60 is a shaft for inputting the torque of the first rotating electrical machine MG1 to the sun gear S of the power distribution device PT (or inputting the torque transmitted to the sun gear S to the first rotating electrical machine MG1). , And is splined to the sun gear S at the end on the first axial direction A1 side. The first rotor shaft 60 is supported by the intermediate support wall 7 via the rotor bearing 63.

  A distribution output member 21 is disposed on the outer side in the radial direction so as to surround the sun gear S and the carrier CA. The distribution output member 21 is a cylindrical member that occupies substantially the entire axial direction of the accommodation space P. On the inner peripheral surface 21 b of the distribution output member 21, a ring gear R having internal teeth is formed integrally with the distribution output member 21. The ring gear R is formed at the center of the distribution output member 21 in the axial direction. As a result, the entire power distribution device PT is arranged on the radially inner side of the distribution output member 21 so as to overlap the distribution output member 21 in the axial direction (overlapping in the radial direction).

  The distribution output member 21 is supported in a rotatable state with respect to the case 2 at a plurality of axial positions (here, two positions). In the present embodiment, the distribution output member 21 is connected to the case 2 via the first output bearing 61 and the second output bearing 62 that are disposed radially inward of the distribution output member 21 at both axial ends thereof. Is supported in a rotatable state. More specifically, the distribution output member 21 is opposed to the axial protrusion 6 of the end support wall 4 and the axial protrusion 8 of the intermediate support wall 7 that are arranged to face each other in the accommodation space P. The two output bearings 61 and 62 are rotatably supported from the radially inner side. Thus, by adopting a configuration that supports the distribution output member 21 from the radially inner side, the two output bearings 61 and 62 can be reduced in diameter compared to a configuration that supports the distribution output member 21 from the radially outer side. Is possible. In the present embodiment, the first output bearing 61 and the second output bearing 62 correspond to “two output bearings” in the present invention.

  An output gear 22 having external teeth is integrally provided on the outer peripheral surface 21 a of the distribution output member 21. In other words, in the present embodiment, the output gear 22 is, for example, a relatively small-diameter sleeve formed so as to be radially connected to the distribution output member 21 via another member and to surround the input shaft I. It is not formed on a member (see, for example, FIG. 4 of Patent Document 1) or the like, but is formed integrally with the distribution output member 21 on the outer peripheral surface 21a of the distribution output member 21. As described above, in the present embodiment, the distribution output member 21 is supported from the radially inner side by the two output bearings 61 and 62, so that the output gear 22 formed on the outer peripheral surface 21 a of the distribution output member 21 includes two output gears 22. There is no restriction on the axial position of the output bearings 61 and 62. Therefore, such a configuration has an advantage that the degree of freedom regarding the axial position of the output gear 22 becomes very high.

  Therefore, in the present embodiment, the output gear 22 is disposed so as to overlap with the ring gear R provided in the central portion of the inner peripheral surface 21b of the distribution output member 21 in the axial direction (overlap in the radial direction). In addition, in the present embodiment, the output gear 22 is disposed close to the end portion on the axial first direction A1 side, and therefore, on the radially inner side of the distribution output member 21, the end portion on the axial first direction A1 side is also the same. And the first output bearing 61 arranged in the axial direction are overlapped in the axial direction (overlapping in the radial direction). Thereby, compared with the case where the distribution output member 21, the first output bearing 61, and the output gear 22 are arranged side by side in the axial direction, the axial length of the space in which these are arranged is shortened.

  In addition, in the present embodiment, a parking gear 82 having external teeth is formed at the end of the outer peripheral surface 21a of the distribution output member 21 on the second axial direction A2 side. The parking gear 82 is formed integrally with the distribution output member 21. This parking gear 82 meshes with a lock member (not shown) and engages them to forcibly stop the rotation of the distribution output member 21. On the other hand, when the parking gear 82 is disengaged without meshing with the lock member, the distribution output member 21 is allowed to rotate.

  In the present embodiment, the parking gear 82 is disposed at the end of the second axial direction A2 side. Therefore, on the radially inner side of the distribution output member 21, the parking gear 82 overlaps with the second output bearing 62 disposed at the end on the second axial direction A2 side in the axial direction (overlapping in the radial direction). Will be placed. Thereby, compared with the case where the distribution output member 21, the second output bearing 62, and the parking gear 82 are arranged side by side in the axial direction, the axial length of the space in which these are arranged is shortened.

3. Configuration of Distribution Output Member As described above, the distribution output member 21 has a composite gear structure integrally including the ring gear R having internal teeth, the output gear 22 having external teeth, and the parking gear 82 having external teeth. Yes. In addition, as shown in FIGS. 1 and 3, the distribution output member 21 according to the present invention is positioned between the ring gear R and the second output bearing 62 on the side in the first axial direction A1, and the ring gear R is integrated. The first divided member 31 is provided and the second divided member 32 is located on the second axial direction A2 side. And the 1st division member 31 and the 2nd division member 32 are comprised so that separation is possible while engaging so that it may rotate integrally.
Below, the 1st division member 31 and the 2nd division member 32 are each demonstrated.

  The first split member 31 is a member on the axial first direction A1 side of the split output member 21 divided between the ring gear R and the second output bearing 62. The output gear 22 is integrally provided on the outer peripheral surface of the first split member 31 at the end in the first axial direction A1 side, and the ring gear R is integrally formed on the inner peripheral surface of the first split member 31 at the center. Provided. In the present embodiment, the ring gear R is provided so as to protrude with respect to the inner peripheral surface. Further, an axial step portion 23 that is in contact with the first output bearing 61 is provided on an inner peripheral surface of the first split member 31 at an end portion on the first axial direction A1 side. Here, the “step portion in the axial direction” on the inner peripheral surface is formed at a predetermined position in the axial direction of the first divided member 31, and the inner diameter of the first divided member 31 changes in a step shape at the position. Means the part. The inner diameter of the portion on the first axial direction A1 side with respect to the stepped portion 23 is formed to be larger than the inner diameter of the portion on the second axial direction A2 side with respect to the stepped portion 23. The first split member 31 is interposed via a first output bearing 61 disposed between the large diameter portion of the step portion 23 on the first axial direction A1 side and the axial protruding portion 6 of the end support wall 4. The case 2 is supported so as to be rotatable. A side surface of the first output bearing 61 on the second axial direction A2 side is in contact with the step portion 23, and a side surface of the first output bearing 61 on the first axial direction A1 side is on the axial protrusion 6 of the end support wall 4. It contacts the provided step. Thereby, the axial position of the first output bearing 61 is determined.

  Furthermore, a first engagement portion 33 that is an engagement portion with the second divided member 32 is provided on the inner peripheral surface of the first divided member 31 at an end portion on the second axial direction A2 side. In addition, a first fitting portion 35 that is a fitting portion with the second divided member 32 is provided on the inner circumferential surface of the first divided member 31 on the first axial direction A1 side of the first engaging portion 33. It has been. In the present embodiment, the first fitting portion 35 is disposed adjacent to the first engaging portion 33 on the first axial direction A1 side.

  More specifically, the first engagement portion 33 is provided with spline internal teeth, and the spline teeth of the first engagement portion 33 are formed so as to be positioned radially outward from the inner peripheral surface of the first fitting portion 35. Has been. In other words, the first fitting portion 35 is formed such that the entire inner peripheral surface is positioned radially inward from the spline teeth of the first engaging portion 33. The first engagement portion 33 is in contact with the second engagement portion 34 provided on the second split member 32 from the radially outer side in the engaged state, and overlaps the second engagement portion 34 in the axial direction ( (Overlapping when viewed in the radial direction). Moreover, the 1st fitting part 35 overlaps with the 2nd fitting part 36 provided in the 2nd division member 32 in the axial direction, when the 1st division member 31 and the 2nd division member 32 are in an engagement state ( It is formed so as to be fitted in the radial direction while being in contact with the second fitting portion 36 from the outside in the radial direction.

  In the present embodiment, in the state where the first divided member 31 and the second divided member 32 are combined, the outermost peripheral surface of the first divided member 31 is positioned on the radially outer side from the outermost peripheral surface of the second divided member 32. . For this reason, in the state which combined the 1st division member 31 and the 2nd division member 32, the end surface 41 of the axial 2nd direction A2 side of the 1st division member 31 is the 2nd division member 32 and an axial direction on the radial direction outer side. Have portions that do not overlap.

  The second divided member 32 is a member on the second axial direction A2 side of the divided output member 21 divided between the ring gear R and the second output bearing 62. A parking gear 82 is integrally provided on the outer peripheral surface of the second split member 32. Further, an axial stepped portion 24 in contact with the second output bearing 62 is provided on the inner peripheral surface of the second divided member 32 at the end on the second axial direction A2 side. The inner diameter on the second axial direction A2 side with respect to the stepped portion 24 is larger than the innermost peripheral surface of the second output bearing 62 adjacent to the first axial direction A1 side with respect to the stepped portion 24. Is formed. The second divided member 32 is interposed via a second output bearing 62 disposed between the large-diameter portion of the stepped portion 24 on the second axial direction A2 side and the axial protruding portion 8 of the intermediate support wall 7. The case 2 is rotatably supported. The side surface on the first axial direction A1 side of the second output bearing 62 is in contact with the step portion 24, and the side surface on the second axial direction A2 side of the second output bearing 62 is provided on the axial protruding portion 8 of the intermediate support wall 7. It touches the stepped part. Thereby, the axial position of the second output bearing 62 is determined.

  Further, a second fitting portion 36 that is a fitting portion with the first divided member 31 is provided on the outer peripheral surface of the second divided member 32 at the end portion on the first axial direction A1 side. In addition, a second engagement portion 34 that is an engagement portion with the first split member 31 is provided on the outer peripheral surface of the second split member 32 on the second axial direction A2 side of the second fitting portion 36. ing. In the present embodiment, the second fitting portion 36 is disposed adjacent to the second axial direction A2 side of the second engaging portion 34.

  More specifically, the outer diameter of the second fitting portion 36 is the smallest on the outer peripheral surface of the second divided member 32 and is formed to have the same size as the inner diameter of the first fitting portion 35 of the first divided member 31. Has been. The second engaging portion 34 is provided with external teeth corresponding to the internal teeth of the spline of the first engaging portion 33, and the spline teeth of the second engaging portion 34 include the second fitting portion 36, The second split member 32 excluding the two engaging portions 34 is formed so as to be positioned on the radially inner side with respect to the outer diameter. In other words, the spline teeth of the second engaging portion 34 are formed so as to be positioned radially inward from the outermost peripheral surface of the second divided member 32. Since the second engaging portion 34 is formed in this manner, the outer peripheral surface of the second dividing member 32 has an axial step portion 42 on the second axial direction A2 side of the second engaging portion 34. Become. The outer diameter on the second axial direction A2 side with respect to the stepped portion 42 is such that the outer diameter of the second engaging portion 34 and the outer side of the second fitting portion 36 that are close to the first axial direction A1 side with respect to the stepped portion 42. It is formed to have a larger diameter than the diameter. Here, the “outer diameter of the second engaging portion 34” means a diameter determined by the outer periphery of the spline of the second engaging portion 34.

  With such a configuration, the first split member 31 and the second split member 32 are combined from the axial direction with the shaft centers aligned, so that the spline teeth of the first engagement portion 33 and the second engagement portion 34 are combined. The spline teeth are engaged, the relative rotation in the circumferential direction between the first divided member 31 and the second divided member 32 is restricted, and the first divided member 31 and the second divided member 32 are connected so as to rotate together. In addition, since the first fitting portion 35 and the second fitting portion 36 are fitted so as to be in contact with each other in the radial direction, the relative movement in the radial direction between the first divided member 31 and the second divided member 32 is also restricted. The Thereby, an axial center precision can be improved compared with the case where the 1st division member 31 and the 2nd division member 32 are connected only by a spline.

  Further, in a state where the first divided member 31 and the second divided member 32 are combined, the ring gear R provided integrally with the first divided member 31 overlaps with the second divided member 32 in the radial direction (in the axial direction). To overlap). The ring gear R is disposed at a position spaced apart from the end surface of the second divided member 32 on the first axial direction A1 side in the axial direction. Further, in a state where the first divided member 31 and the second divided member 32 are combined, the end surface 41 on the second axial direction A2 side of the first divided member 31 abuts on the stepped portion 42 of the second divided member 32. Thereby, the relative positional relationship in the axial direction between the first divided member 31 and the second divided member 32 is defined, and the axial length of the distribution output member 21 is determined.

  In the present application, “radially overlapping” means that at least a part of two objects (members) are located at the same position with respect to the radial arrangement, in other words, an overlapping part when viewed in the axial direction. That is, when the viewpoint is moved in each direction orthogonal to the line-of-sight direction with the axial direction as the line-of-sight direction, the viewpoint that two objects (members) appear to overlap is present in at least a part of the region. Point to.

Next, a mechanism for discharging the oil inside the distribution output member 21 to the outside of the distribution output member 21 using the spline teeth provided on the first divided member 31 will be described.
Here, in the present embodiment, the first engagement portion 33 of the first split member 31 has a missing part in which one of the spline teeth is cut out over the entire region of the first engagement portion 33 and the second engagement portion 34. A tooth portion 37 is provided. FIG. 3 shows a cross section parallel to the axial direction including the missing tooth portion 37. An oil discharge groove 38 is provided on the inner peripheral surface of the first fitting portion 35 of the first split member 31 at the same circumferential position as the missing tooth portion 37. When the first divided member 31 and the second divided member 32 are in the engaged state, the oil discharge groove 38 communicates the toothless portion 37 of the first engaging portion 33 and the space inside the distribution output member 21. It is formed to do. Further, the stepped portion 42 of the second divided member 32 is provided with a notch groove 40 at the same circumferential position as the missing tooth portion 37. When the first split member 31 and the second split member 32 are in the engaged state, the notch groove 40 communicates the notch portion 37 of the first engagement portion 33 and the space outside the distribution output member 21. It is formed to do.

  By adopting the configuration as described above, the space inside the distribution output member 21 is connected to the space outside the distribution output member 21 through the oil discharge groove 38, the toothless portion 37 and the notch groove 40. Therefore, the oil in the space inside the distribution output member 21 is discharged to the space outside the distribution output member 21 through the oil discharge groove 38, the missing tooth portion 37 and the notch groove 40.

4). Assembly to Hybrid Drive Device Finally, the procedure for assembling the power distribution device PT to the hybrid drive device 1 according to the present embodiment will be described with reference to FIG. When assembling the power distribution device PT, the case main body 2a is arranged with the second axial direction A2 side down as shown in the figure. In this state, from the first axial direction A1 side with respect to the case body 2a, a power split unit PU, which is a sub-assembly including the second split member 32, the input shaft I, the power split device PT, and the first split member 31, The front cover 2b is assembled in order.

  More specifically, the first rotating electrical machine MG1 is assembled to the case body 2a, and the first rotor shaft 60 is fixed via the rotor bearing 63. A second needle bearing 70 is fitted into the first rotor shaft 60, and a cylindrical member having a sun gear S is splined. From this state, first, the second output bearing 62 attached to the second divided member 32 is fitted into the axial protruding portion 8 of the case body 2a. Next, a power distribution unit PU including the input shaft I, the power distribution device PT, the first divided member 31 and the first output bearing 61 is assembled. Here, in the power distribution unit PU, the ring gear R of the power distribution device PT provided in the first split member 31 and the planetary gear supported by the carrier CA formed integrally with the input shaft I are engaged. The first output bearing 61 is a sub-assembly that is fitted to the first split member 31. When the power distribution unit PU is assembled, the input shaft I is inserted into a through hole provided in the first rotor shaft 60 and is fitted to the inner peripheral surface of the second needle bearing 70. Further, the first engaging portion 33 and the first fitting portion 35 of the first divided member 31 engage and fit with the second engaging portion 34 and the second fitting portion 36 of the second divided member 32, respectively. . The planetary gear of the power distribution device PT is engaged with the sun gear S. Finally, the front cover 2b is assembled, and the front cover 2b and the case body 2a are fastened with bolts. At this time, the input shaft I is inserted into a through hole provided in the front cover 2 b and is fitted to the inner peripheral surface of the first needle bearing 69. Moreover, the 1st output bearing 61 provided in the 1st division member 31 is engage | inserted by the outer peripheral surface of the axial direction protrusion part 6 of the front cover 2b.

  Here, when the distribution output member 21 is not divided, it is necessary to simultaneously fit the second output bearing 62 and the cylindrical member provided with the sun gear S when the power distribution device PT is assembled to the case body 2a. Yes, the ease of assembly may be hindered. On the other hand, as in the invention according to the present embodiment, the distribution output member 21 is divided into the first divided member 31 and the second divided member 32 in which the ring gear R is integrally provided, so that the first The dual output bearing 62 and the cylindrical member provided with the sun gear S can be fitted separately, and the ease of assembly is improved. Further, with such a configuration, it is possible to replace the power distribution device PT and the input shaft I only by separating the first divided member 31 and the second divided member 32, and a hybrid excellent in maintainability. The drive device 1 can be realized.

[Other Embodiments]
Finally, other embodiments of the hybrid drive device according to the present invention will be described. Note that the feature configurations disclosed in each of the following embodiments are not applied only in that embodiment, and should be applied in combination with the feature configurations disclosed in the other embodiments unless a contradiction arises. Is also possible.

(1) In the above embodiment, the case where the engaging portion and the fitting portion are provided on the inner peripheral surface of the first divided member 31 and the outer peripheral surface of the second divided member 32 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the first engagement portion 33 and the first fitting portion 35 are provided on the outer peripheral surface of the first split member 31, and the second engagement portion 34 and the second fit are provided on the inner peripheral surface of the second split member 32. A configuration in which the joint portion 36 is provided is also a preferred embodiment of the present invention.

(2) In the above embodiment, the case where the first split member 31 and the second split member 32 are provided with the fitting portions 35 and 36 in addition to the engagement portions 33 and 34 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, the first split member 31 and the second split member 32 may be configured such that the fitting portions 35 and 36 are not provided, but only the engaging portions 33 and 34 are provided. One of the forms.

(3) In the above embodiment, the case where each of the first engagement portion 33 and the second engagement portion 34 includes spline teeth has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a key is provided in one of the first engaging portion 33 and the second engaging portion 34, and a key groove corresponding to the key is provided in the other of the first engaging portion 33 and the second engaging portion 34. This is one of the preferred embodiments of the present invention. Further, for example, a bolt hole penetrating the first engagement portion 33 and the second engagement portion 34 is provided, and the first engagement portion 33 and the second engagement portion 34 are connected with bolts from the radially outer side of the first divided member 31. The fixing configuration is also one of the preferred embodiments of the present invention.

(4) In the above embodiment, a case where one of the spline teeth of the first engagement portion 33 is cut out over the entire region of the first engagement portion 33 and the second engagement portion 34 will be described as an example. did. However, the embodiment of the present invention is not limited to this. That is, for example, one of the spline teeth of the second engagement portion 34 or a plurality of the spline teeth of the first engagement portion 33 and the second engagement portion 34 is formed by the first engagement portion 33 and the second engagement portion. One of the preferred embodiments of the present invention is a configuration in which the entire region is cut away. In such a case, it is necessary to provide the oil discharge groove 38 and the notch groove 40 corresponding to the location where the spline teeth are cut off.

(5) In the above embodiment, the case where the notch groove 40 is provided in the second divided member 32 in order to discharge the oil inside the distribution output member 21 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, providing the notch groove 40 in the end surface 41 of the first split member 31 on the second axial direction A2 side is also one preferred embodiment of the present invention. Similarly, the oil discharge groove 38 may be provided in the second fitting portion 36 of the second divided member 32 without providing the oil discharge groove 38 in the first divided member 31. Further, for example, if the spline teeth of the first divided member 31 are formed so as to have a portion positioned radially outward from the outermost peripheral surface of the second divided member 32, the distribution output member is provided without providing the notch groove 40. The oil in the space inside 21 can be discharged to the outside. Therefore, it is also one preferred embodiment of the present invention that the first dividing member 31 or the second dividing member 32 is not provided with the notch groove 40.

(6) In the above embodiment, the spline teeth provided on the first split member 31 are used to discharge the oil inside the distribution output member 21. However, the embodiment of the present invention is not limited to this. That is, for example, it is also preferable that at least one of the first divided member 31 and the second divided member 32 be provided with an oil discharge hole provided by drilling so as to penetrate in the radial direction. It is one of the embodiments. Moreover, it is also one of the preferable embodiments of the present invention to have a configuration that does not have a mechanism for discharging the oil inside the distribution output member 21.

(7) In the above embodiment, the case where the distribution output member 21 is divided between the ring gear R and the second output bearing 62 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a configuration in which the distribution output member 21 is divided between the ring gear R and the first output bearing 61 is also one preferred embodiment of the present invention. In this case, the member on the axial second direction A2 side corresponds to the first divided member 31 in the present invention, and the member on the axial first direction A1 side corresponds to the second divided member 32.

(8) In the above embodiment, the case where the output gear 22 is provided on the outer peripheral surface of the first split member 31 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a configuration in which the output gear 22 is provided on the outer peripheral surface of the second split member 32 is also a preferred embodiment of the present invention.

(9) In the above embodiment, the case where the output gear 22 is arranged to overlap the ring gear R in the axial direction (overlapping as viewed in the radial direction) has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a configuration in which the output gear 22 is arranged at a position that does not overlap the ring gear R in the axial direction is also one preferred embodiment of the present invention.

(10) In the above embodiment, the case where the parking gear 82 is provided on the outer peripheral surface of the second split member 32 has been described as an example. However, the embodiment of the present invention is not limited to this. That is, for example, a configuration in which the parking gear 82 is provided on the outer peripheral surface of the first split member 31 is also a preferred embodiment of the present invention.

  The present invention provides a hybrid drive device including an input member drivingly connected to an engine, a rotating electrical machine, and a power distribution device that distributes and transmits torque of the input member to the rotating electrical machine and a distribution output member. It can be suitably used.

1: Hybrid drive device 21: Distribution output member 21a: Outer peripheral surface 21b: Inner peripheral surface 22: Output gear 31: First divided member 32: Second divided member 33: First engaging portion 34: Second engaging portion 35 : First fitting part 36: second fitting part 37: missing tooth part 61: first output bearing (output bearing)
62: Second output bearing (output bearing)
E: Engine I: Input shaft (input member)
MG1: First rotating electrical machine (rotating electrical machine)
PT: Power distribution device R: Ring gear

Claims (5)

A hybrid drive device comprising: an input member drivingly connected to an engine; a rotating electrical machine; and a power distribution device that distributes and transmits torque of the input member to the rotating electrical machine and a distribution output member.
The entire power distribution device is arranged to overlap the distribution output member in the axial direction on the radially inner side of the distribution output member,
A ring gear that constitutes the power distribution device and has internal teeth is provided integrally with the distribution output member on the inner peripheral surface of the distribution output member,
Two output bearings rotatably supporting the distribution output member;
The two output bearings are arranged on the radially inner side of the distribution output member and on both axial sides of the power distribution device,
The distribution output member is divided between the ring gear and one of the output bearings into a first divided member in which the ring gear is integrally provided, and a second divided member,
The hybrid drive device in which the first divided member and the second divided member are engaged with each other so as to rotate integrally and are separable. A first engaging portion that is an engaging portion with the second divided member is provided on the inner peripheral surface of the first divided member,
A second engagement portion that is an engagement portion with the first split member is provided on the outer peripheral surface of the second split member,
2. The hybrid drive device according to claim 1, wherein the first engagement portion is disposed radially outside the second engagement portion so as to overlap the second engagement portion in the axial direction. Each of the first engagement portion and the second engagement portion includes spline teeth that engage with each other,
At least one of the spline teeth of the first engagement portion and the second engagement portion is cut out over the entire overlapping region in the axial direction of the first engagement portion and the second engagement portion. 2. The hybrid drive device according to 2. A first fitting portion that is a fitting portion with the second divided member is provided on the inner peripheral surface of the first divided member,
A second fitting portion that is a fitting portion with the first divided member is provided on the outer peripheral surface of the second divided member,
The first fitting portion is disposed so as to overlap with the second fitting portion in the axial direction, and is fitted in the radial direction in a state of coming into contact with the second fitting portion from the radially outer side. Item 4. The hybrid drive device according to any one of Items 1 to 3. An output gear having external teeth is integrally provided on the outer peripheral surface of the first divided member,
5. The hybrid drive device according to claim 1, wherein the output gear is disposed so as to overlap with the ring gear in an axial direction on an outer side in a radial direction of the ring gear.

Images