JP2015065749A - Vehicle driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize an entire vehicle driving device including an inverter device and simplify a seal structure of an inverter housing chamber.SOLUTION: The invention relates to a vehicle driving device. The vehicle driving device includes: a rotary electric machine MG; a transmission TM; a case 2; an inverter device 3; and a wiring member 40. An oil-tight space Q is formed between a first case part 21 and a second case part 23, and the rotary electric machine MG is housed in the oil-tight space Q. An inverter housing chamber P is formed between the second case part 23 and a cover member 51. The wiring member 40 is provided penetrating through the second case part 23. The vehicle driving device includes seal members 61, 62 which seal a space between the second case part 23 and the wiring member 40.

Description

  The present invention relates to a vehicle drive device that includes a rotating electrical machine and an inverter device that controls the rotating electrical machine.

  For example, in a hybrid vehicle, a rotating electrical machine provided in a driving device as a driving force source for wheels or a kinetic energy regeneration device usually requires an inverter device mainly composed of switching elements. Since the rotating electrical machine and the inverter device are electrically connected using a wiring member, they can be arranged at different positions from each other. However, considering the convenience on the vehicle, they are combined into one case. It is desirable to be integrated. From this point of view, there is a vehicle drive device in which an inverter device [inverters 41, 42] that controls a rotating electrical machine [generator 1, motor 2] is integrated with a case [drive device case 3] that houses the rotating electrical machine or the like. JP, 2004-343845, A (patent documents 1).

  In the device of Patent Document 1, the case includes a first case portion [front case 31] that houses one rotating electrical machine [generator 1], and the other rotating electrical machine [motor 2] and transmission (underdrive device U). And a second case portion [rear case 32] to be accommodated. The first case portion and the second case portion are joined to each other in the axial direction (the direction in which the rotation axis of the rotating electrical machine extends). And a cover member [inverter case 40 and cover 46] is attached so that it may straddle the 1st case part and the 2nd case part, and the inverter device is stored in the space formed in the inside.

  However, in the structure in which the cover member is provided so as to straddle the first case portion and the second case portion as in Patent Document 1, there is a problem that the physique of the entire apparatus tends to be large. Moreover, in order to prevent liquids such as water and oil from entering the storage chamber of the inverter device, a relatively complicated seal structure is required. For example, in the structure of FIG. 5 of Patent Document 1, a seal member [seal means 52A, 52B] for sealing the space between the cover member and the first case portion and the second case portion is required. Moreover, in the structure of FIG. 3 of patent document 1, although the common sealing member [sealing means 52] straddling a 1st case part and a 2nd case part is used, in this case, the sealing member which can absorb a level | step difference In addition, a relatively large amount of sealing members are required for the joining surfaces of the two case portions.

  In the device of Patent Document 1, the wiring member extending from the inverter device is inserted into a through hole provided in the outer peripheral wall of the first case portion and connected to the rotating electrical machine in the first case portion. It arrange | positions in the space of the outer peripheral side of a case part. For this reason, in order to seal the whole of such a wiring structure appropriately, a sealing member straddling the first case portion and the second case portion is necessary. Here, by providing the cover member only in the second case portion, it is possible to simplify the seal structure related to the cover member. However, since the sealing part of the wiring member is required at two places between the wiring member and the cover member and between the wiring member and the first case part, a complicated sealing structure is required as a whole. .

  As disclosed in JP 2008-301572A (Patent Document 2), the wiring member introduced into the case [divided housing case 13 and divided housing case 23] from the inverter device [PCU300] is connected to the rotating electric machine in the case. A structure connected to [motor generator MG1] is also known. However, Patent Document 2 does not mention a seal structure.

JP 2004-343845 A JP 2008-301572 A

  Therefore, it is desired to reduce the size of the entire vehicle drive device including the inverter device and simplify the seal structure of the inverter housing chamber.

The characteristic configuration of the vehicle drive device according to the present invention is as follows.
A rotating electrical machine that functions as a driving force source for wheels together with the internal combustion engine;
A transmission that is arranged side by side in the axial direction, which is the direction in which the rotational axis of the rotating electrical machine extends, with respect to the rotating electrical machine;
A case including a first case portion that houses the rotating electrical machine and a second case portion that houses the transmission,
An inverter device for controlling the rotating electrical machine;
A wiring member for connecting the rotating electrical machine and the inverter device,
Forming an oil-tight space in which the first case portion and the second case portion communicate with each other, and the second case portion is joined to the side of the first case portion opposite to the internal combustion engine side in the axial direction;
Between the second case portion and the cover member joined to the second case portion, an inverter accommodating chamber for accommodating the inverter device is formed,
The rotating electrical machine is accommodated in the oil-tight space,
The wiring member is provided through the second case portion so as to extend over the inverter accommodating chamber and the oil-tight space;
In the point provided with the sealing member which seals between the said 2nd case part and the said wiring member.

  In the present application, the “rotary electric machine” is a concept including a motor (electric motor), a generator (generator), and a motor / generator that functions as both a motor and a generator as necessary.

  According to this characteristic configuration, the cover member for forming the inverter accommodating chamber between the case and the first case portion and the second case portion does not extend over the range occupied by the second case portion. Therefore, in combination with the wiring member being provided through the second case portion, it leads to simplification of the seal structure for preventing liquid such as water and oil from entering the inverter accommodating chamber. That is, an appropriate sealing structure can be easily realized by simply sealing between the cover member and the second case portion and between the second case portion and the wiring member by a simple method. In particular, since the rotating electrical machine is disposed in a fluid-tight oil-tight space formed between the first case portion and the second case portion, the seal between the wiring member and the case is connected to the second case portion. It can be only one place to penetrate. Therefore, both the seal structure of the inverter housing chamber and the seal of the wiring member can be simplified.

  Further, since the cover member is accommodated only in the range occupied by the second case portion, the physique of the entire apparatus can be reduced. In consideration of the state of mounting on the vehicle, the inverter device is arranged at a position further away from the internal combustion engine. Therefore, avoid the auxiliary equipment arranged in the vicinity of the internal combustion engine and place the inverter in a relatively generous space. A device can also be arranged. Therefore, the vehicle-mounted property of the entire vehicle drive device including the inverter device can be improved.

  Hereinafter, preferred embodiments of the present invention will be described.

  As one aspect, the case further includes an intermediate wall disposed between the rotating electrical machine and the transmission in the axial direction, and the wiring member is formed on the intermediate wall in the oil-tight space. Preferably, the through hole is formed at a position overlapping with the rotating electrical machine when viewed in the axial direction.

  In the present application, regarding the arrangement of two members, “overlapping in a certain direction” means that when the virtual straight line parallel to the viewing direction is moved in each direction orthogonal to the virtual straight line, It means that a region that intersects both of the two members exists at least in part.

  According to this configuration, even when an intermediate wall exists between the rotating electrical machine and the transmission, the wiring member is provided so as to pass through the through hole formed in the intermediate wall. The length can be kept short. In particular, since the through hole overlaps with the rotating electrical machine when viewed in the axial direction, the wiring member can be arranged linearly along the axial direction, and the path length of the wiring member can be minimized. In addition, since the wiring member can be introduced into the first case portion on the radially inner side than the radially outer end portion of the rotating electrical machine, expansion of the first case portion in the radial direction is suppressed. Therefore, it is easy to secure a space for arranging the catchers in the on-vehicle state. In addition, it is easy to ensure a tool clearance when the vehicle drive device and the internal combustion engine are fastened with bolts.

  As one aspect, the rotating electrical machine includes a stator including a stator core and a coil disposed on the stator core, and the coil includes two coil end portions that respectively protrude from the stator core on both sides in the axial direction. And it is suitable when the connection terminal with the said wiring member of the said coil is provided in the coil end part by the side of the said transmission apparatus in the said axial direction of the two said coil end parts.

  According to this configuration, the wiring member extending from the internal space of the second case portion arranged on the transmission device side with respect to the rotating electrical machine can be connected to the connection terminal of the coil with a short wiring length.

Schematic diagram showing the schematic configuration of a vehicle drive device A view of the vehicle drive device in the axial direction View of the vehicle drive device as seen in the vertical direction Exploded perspective view of vehicle drive device Schematic diagram showing the positional relationship of each component viewed in the horizontal direction Partial enlarged view of FIG.

  An embodiment of a vehicle drive device according to the present invention will be described with reference to the drawings. The vehicle drive device 1 according to the present embodiment is a vehicle drive device (hybrid vehicle drive) for driving a vehicle (hybrid vehicle) provided with both the internal combustion engine E and the rotating electrical machine MG as a driving force source for the wheels W. Device). Specifically, the vehicle drive device 1 is configured as a drive device for a 1-motor parallel type hybrid vehicle. In the following description, terms relating to the direction and position of each member are concepts including a state having a difference due to an error that can be allowed in manufacturing. Moreover, the direction about each member represents the direction in the state in which they were assembled | attached to the drive device 1 for vehicles.

  As shown in FIG. 1, the vehicle drive device 1 includes a plurality of (in this example) driving input coupled to the internal combustion engine E and a plurality of (in this example, two) wheels W. Two) output shafts O, a rotating electrical machine MG, and a transmission TM. “Drive coupling” means a state where two rotating elements are coupled so as to be able to transmit a driving force (synonymous with torque). This concept includes a state in which the two rotating elements are connected so as to rotate integrally, and a state in which the driving force is transmitted through one or more transmission members. In the present embodiment, the vehicle drive device 1 further includes an engagement device CL, a counter gear mechanism C, and a differential gear device DF. The engaging device CL, the rotating electrical machine MG, the transmission TM, the counter gear mechanism C, and the differential gear device DF are provided in a power transmission path that connects the input shaft I and the output shaft O. These are provided in the order described from the input shaft I side. These are housed in a case (drive device case) 2.

  The rotating electrical machine MG is arranged coaxially with the input shaft I. The transmission TM is arranged side by side in the direction of the rotating electrical machine MG, the input shaft I, and the rotational axis of the rotating electrical machine MG. In the present embodiment, the transmission apparatus TM is disposed coaxially with the input shaft I and the rotating electrical machine MG. The input shaft I, the rotating electrical machine MG, and the transmission TM are arranged in the order described from the internal combustion engine E side. In the counter gear mechanism C, the input shaft I or the like and the rotational axis are parallel to each other and are arranged on different axes. Further, the differential gear device DF is arranged on a separate axis with the input shaft I and the like and the counter gear mechanism C parallel to the rotation axis. “Parallel” means a parallel state or a state that can be regarded as substantially parallel (for example, a state that intersects at an angle of 5 ° or less).

  In the present embodiment, the rotation axis common to the input shaft I, the rotating electrical machine MG, and the transmission TM is referred to as “first axis X1”. Further, the rotation axis of the counter gear mechanism C is referred to as “second axis X2”, and the rotation axis of the differential gear device DF is referred to as “third axis X3”. As shown in FIG. 2, the first axial center X1, the second axial center X2, and the third axial center X3 are located at the apexes of a triangle (in this example, an obtuse triangle) when viewed in the axial direction L parallel to them. Are arranged to be. Such a multi-axis configuration (three-axis configuration in this example) is suitable as a configuration when the vehicle drive device 1 is mounted on, for example, an FF (Front Engine Front Drive) vehicle.

  In the present embodiment, the direction toward the internal combustion engine E side (the right side in FIG. 1) when viewed from the rotating electrical machine MG in the axial direction L is defined as the “first axial direction L1”. Further, a direction toward the transmission device TM side (left side in FIG. 1) when viewed from the rotating electrical machine MG is defined as “second axial direction L2”.

  As shown in FIG. 1, an input shaft I as an input member is drivingly connected to an internal combustion engine E. The internal combustion engine E is a prime mover (such as a gasoline engine or a diesel engine) that is driven by combustion of fuel inside the engine to extract power. The internal combustion engine E functions as a driving force source for the wheels W together with the rotating electrical machine MG. In the present embodiment, the input shaft I is drivingly connected to the output shaft (crankshaft or the like) of the internal combustion engine E. The output shaft of the internal combustion engine E and the input shaft I may be drivingly connected via a damper or the like.

  The engagement device CL is provided in a power transmission path that connects the input shaft I and the rotating electrical machine MG. The engagement device CL selectively connects the input shaft I (internal combustion engine E) and the rotating electrical machine MG. The engagement device CL functions as an internal combustion engine separation engagement device that separates the internal combustion engine E from the wheel W. In the present embodiment, the engagement device CL is configured as a hydraulically driven friction engagement device. An electromagnetically driven friction engagement device, a meshing engagement device, or the like may be used.

  The rotating electrical machine MG functions as a driving force source for the wheels W together with the internal combustion engine E. The rotating electrical machine MG includes a stator St fixed to the case 2 and a rotor Ro that is rotatably supported on the radial inner side of the stator St. The stator St includes a stator core Sc and a coil Co disposed on the stator core Sc (see FIG. 5). The coil Co includes two coil end portions Ce that protrude from the stator core Sc to both sides in the axial direction L, respectively.

  The rotating electrical machine MG 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. . As shown in FIG. 1, the rotating electrical machine MG is electrically connected to a power storage device B (battery, capacitor, or the like) as a DC power source via an inverter device 3. The rotating electrical machine MG receives power from the power storage device B and runs in power, or supplies power stored in the power storage device B with power generated by the torque of the internal combustion engine E or the inertial force of the vehicle. The rotor Ro of the rotating electrical machine MG is drivingly connected so as to rotate integrally with the intermediate shaft M. The intermediate shaft M is also an input shaft (transmission input shaft) of the transmission apparatus TM.

  In the present embodiment, the transmission TM is an automatic stepped transmission that includes a plurality of gear mechanisms and a plurality of shift engagement devices and that can switch between a plurality of shift stages having different gear ratios. As the transmission TM, an automatic continuously variable transmission capable of changing the gear ratio steplessly, a manual stepped transmission equipped with a plurality of gears with different gear ratios that can be manually switched by a driver, a fixed gear shift A constant transmission device or the like having a single gear ratio may be used. The transmission TM shifts the rotation and torque input to the intermediate shaft M in accordance with the gear ratio at each time and converts the torque, and a transmission output gear that is an output member (transmission output member) of the transmission TM. Communicate to Go.

  The transmission output gear Go is drivingly connected to the counter gear mechanism C. The counter gear mechanism C includes a first gear G1 and a second gear G2 that are respectively formed on a common shaft member. The first gear G1 meshes with the transmission output gear Go of the transmission apparatus TM. The second gear G2 meshes with the differential input gear Gi of the differential gear device DF. In the present embodiment, the second gear G2 is disposed on the first axial direction L1 side (internal combustion engine E side) with respect to the first gear G1. The second gear G2 is formed with a smaller diameter (less teeth) than the first gear G1.

  The differential gear device (output differential gear device) DF is drivingly connected to the wheel W via an output shaft O as an output member. The differential gear device DF includes a differential input gear Gi and a differential main body portion (a main body portion of the differential gear device DF) connected to the differential input gear Gi. The differential main body portion includes a plurality of bevel gears that mesh with each other and a differential case that accommodates them, and plays a central role in the differential mechanism. The differential gear unit DF transmits rotation and torque input from the rotating electrical machine MG side to the differential input gear Gi via the transmission unit TM and the counter gear mechanism C, and outputs the left and right output shafts O at the differential main body. (That is, distributed to the left and right wheels W) and transmitted. Accordingly, the vehicle drive device 1 can cause the vehicle to travel by transmitting the torque of at least one of the internal combustion engine E and the rotating electrical machine MG to the wheels W.

  As shown in FIG. 3, the case 2 that houses the rotating electrical machine MG, the transmission device TM, and the like includes a first case portion 21 and a second case portion 23 that are divided in the axial direction L. The first case portion 21 mainly forms a housing space for the rotating electrical machine MG and the engaging device CL. The second case portion 23 mainly forms an accommodation space for the transmission TM and the counter gear mechanism C. In the present embodiment, a housing space for the differential gear device DF is formed across the first case portion 21 and the second case portion 23 (see also FIG. 4). The second case portion 23 is joined to the first case portion 21 from the side opposite to the internal combustion engine E side in the axial direction L (on the second axial direction L2 side). A liquid gasket (an example of a sealing means) such as FIPG (Formed In Place Gaskets) is disposed on the mating surface of the first case portion 21 and the second case portion 23.

  As shown in FIG. 5, in the present embodiment, the case 2 further includes an intermediate wall 22 disposed between the rotating electrical machine MG and the transmission device TM in the axial direction L. The intermediate wall 22 is formed as a wall portion extending in the radial direction and the circumferential direction. The intermediate wall 22 is provided at the end portion of the first case portion 21 on the transmission device TM side (second axial direction L2 side). The intermediate wall 22 is formed with a plurality of through holes (through holes in which the intermediate shaft M is disposed and through holes 22a in which connection cables 48 described later are disposed) penetrating the intermediate wall 22 in the axial direction L. Yes. Through these through holes, the housing space for the rotating electrical machine MG and the engaging device CL, the housing space for the transmission TM and the counter gear mechanism C, and the housing space for the differential gear device DF are in communication with each other. The common space communicating with each other is formed in an oil-tight state (a state in which oil is sealed inside). That is, in the state where the first case portion 21 and the second case portion 23 are joined, the above-described spaces are combined to form a common oil-tight communication space Q. The oil-tight communication space Q accommodates main drive elements of the vehicle drive device 1 such as the rotating electrical machine MG, the engagement device CL, the transmission device TM, the counter gear mechanism C, and the differential gear device DF. It constitutes a “drive element storage chamber”. In the present embodiment, the oil-tight communication space Q corresponds to the “communication oil-tight space” in the present invention.

  In addition, in this example, the configuration in the case where the vehicle drive device 1 includes a damper is illustrated, and the third case portion 29 that forms the accommodation space of the damper has an internal combustion engine E side ( It is joined from the first axial direction L1 side). As described above, the third case portion 29, the first case portion 21, and the second case portion 23 are arranged such that the separation length along the axial direction L from the internal combustion engine E increases in the order described. .

  As shown in FIG. 2, the inverter device 3 that controls the rotating electrical machine MG is integrated with the case 2. The inverter device 3 is directly fixed to and integrated with the case 2 without using an inverter case or the like that houses the inverter device 3. That is, in the vehicle drive device 1 according to the present embodiment, an inverter caseless structure is employed. In such an inverter caseless structure, it is not necessary to provide a dedicated inverter case, and it is not necessary to provide a fixing seat for fixing the inverter case to the case 2. Therefore, cost reduction can be achieved by reducing the number of parts. In addition, the entire apparatus can be reduced in size.

  As shown well in FIG. 3, in this embodiment, the inverter device 3 is fixed to the second case portion 23 that accommodates the transmission device TM and the like, not the first case portion 21 that accommodates the rotating electrical machine MG and the like. Has been. In the present embodiment, a large-diameter and thin rotary electric machine MG is used in order to keep the length of the entire apparatus in the axial direction L short (see FIG. 5). For this reason, the transmission TM has a smaller diameter than the rotating electrical machine MG, and an annular space caused by the difference between the outer diameter of the rotating electrical machine MG and the outer diameter of the transmission TM is formed on the radially outer side of the transmission TM. Is formed. Therefore, by arranging the inverter device 3 by effectively utilizing at least a part of the annular space, the entire vehicle drive device 1 including the integrated inverter device 3 is downsized.

  Further, the inverter device 3 is fixed only to the second case portion 23 disposed on the side opposite to the internal combustion engine E with respect to the first case portion 21. In such a configuration, the first cover member 51 for forming the inverter accommodating chamber P (first accommodating portion P1) between itself and the case 2 is accommodated only in the range in the axial direction L occupied by the second case portion 23. This is advantageous. That is, for example, as compared with the case where the first cover member 51 is disposed across the first case portion 21 and the second case portion 23, the physique of the entire apparatus can be reduced. Further, by disposing the inverter device 3 further away from the internal combustion engine E, the inverter device 3 can be disposed in a relatively generous space while avoiding auxiliary machinery disposed in the vicinity of the internal combustion engine E. . For this reason, even if the inverter device 3 slightly protrudes radially outward (upward in this example) from the transmission TM and the rotating electrical machine MG, there is almost no inconvenience on the vehicle. Further, the influence of the heat of the internal combustion engine E on the inverter device 3 can be suppressed.

  As shown in FIGS. 2 and 3, the second case portion 23 includes an outer peripheral wall 24 formed in a deformed cylindrical shape along the outer shapes of the transmission device TM, the counter gear mechanism C, and the differential gear device DF. It has a pair of protruding walls 25 arranged to face each other so as to protrude outward from the outer peripheral wall 24. A space defined by the outer peripheral wall 24 and the pair of protruding walls 25 is an inverter accommodation chamber P. Thus, the inverter accommodation chamber P is formed along the outer peripheral wall 24 of the case 2 (second case portion 23). The inverter device 3 is accommodated in the inverter accommodation chamber P. The inverter device 3 is integrally fixed to the case 2 (second case portion 23) in the inverter accommodating chamber P.

  Inverter device 3 includes a conversion unit 31 and a capacitor 36. The conversion unit (DC / AC conversion unit) 31 converts DC power and AC power. As shown in FIG. 2, the conversion unit 31 includes a flat base plate 32 and a plurality of switching elements 33 fixed on the base plate 32. The base plate 32 is made of a material having high thermal conductivity (for example, a metal material such as copper or aluminum), and also functions as a heat sink. As the switching element 33, for example, an IGBT (Insulated Gate Bipolar Transistor) or a MOSFET (Metal Oxide Semiconductor Field Effect Transistor) is used. The conversion unit 31 includes a rectifying element made of, for example, a diode, and the rectifying element is connected in parallel to the switching element 33. A control board 34 that controls the switching of the switching element 33 is fixed to the base plate 32.

  Capacitor 36 smoothes (suppresses fluctuations) DC power transferred between power storage device B and conversion unit 31. As the capacitor 36, for example, a film capacitor made of a synthetic resin, a ceramic capacitor made of an inorganic material, or the like can be used. Such a capacitor 36 has a relatively large degree of design freedom regarding its size and shape, and can be adjusted according to the size and shape of the space in which it is arranged. The inverter device 3 may further include various components for configuring the booster circuit.

  As shown in FIGS. 3 and 4, in the present embodiment, the case 2 has a crossing wall portion 26 that connects the pair of protruding walls 25. The case 2 has a plate-shaped isolation wall 27 (see FIG. 2) extending from the outer peripheral wall 24 toward the crossing wall portion 26. The inverter accommodation chamber P is partitioned into a first accommodation portion P1 and a second accommodation portion P2 by a separation wall 27. The conversion unit 31 is accommodated in the first accommodating part P1, and the capacitor 36 is accommodated in the second accommodating part P2.

  As shown in FIG.2 and FIG.4, the 1st accommodating part P1 and the 2nd accommodating part P2 are opened in the mutually different direction. Specifically, the first storage portion P1 is open upward and the second storage portion P2 is open sideways. Thereby, the conversion unit 31 can be inserted into the first housing portion P <b> 1 from above along the vertical direction and fixed to the second case portion 23. Moreover, the capacitor | condenser 36 can be inserted in the 2nd accommodating part P2 from the side along a horizontal direction, and can be fixed to the 2nd case part 23. FIG. The conversion unit 31 and the capacitor 36 can be fixed to the second case portion 23 by processes independent of each other. In this state, the first cover member 51 and the second cover member 52 are joined to the second case portion 23. The 1st cover member 51 covers the 1st accommodating part P1 which comprises the inverter accommodating chamber P, and the 2nd cover member 52 covers the 2nd accommodating part P2. In the present embodiment, the first cover member 51 and the second cover member 52 each correspond to a “cover member” in the present invention.

  As shown in FIG. 5, a wiring member 40 is provided to electrically connect the inverter device 3 and the rotating electrical machine MG (coil Co of the stator St). In the present embodiment, the wiring member 40 is provided through the second case portion 23 so as to extend across the inverter accommodation chamber P (first accommodation portion P1) and the oil-tight communication space Q. And the wiring member 40 is arrange | positioned so that the 2nd case part 23 and the 1st case part 21 may be spanned in the oil-tight communication space Q. As a result, the wiring member 40 connected to the inverter device 3 in the inverter accommodating chamber P passes through the second case portion 23 and is guided to the oil-tight communication space Q, and the rotating electrical machine MG in the oil-tight communication space Q. It is connected to the.

  As shown in FIG. 6, the wiring member 40 includes a bus bar 41, a terminal unit 42, and a connection cable 48. The bus bar 41 electrically connects the inverter device 3 (the conversion unit 31 in this example) and the terminal unit 42. The bus bar 41 is made of a metal strip-shaped conductor plate. In the present embodiment, the rotating electrical machine MG is configured to be driven by three-phase AC power, and a bus bar 41 for each phase is provided so as to correspond to the three phases of the coil Co. The bus bar 41 is generally arranged to extend along the horizontal direction.

  The terminal unit 42 electrically connects the bus bar 41 and the connection cable 48. The terminal unit 42 is a unit in which a first relay terminal 43 and a holding base 44 that holds the first relay terminal 43 are integrated. The bus bar 41 is fixed to the first relay terminal 43 by a fastening member such as a bolt. In the present embodiment, the first relay terminal 43 for each phase is provided so as to correspond to the three-phase bus bar 41. A total of three first relay terminals 43 for each phase are collectively held by one holding stand 44. The first relay terminal 43 is made of a metal rod-shaped conductor. The first relay terminal 43 is generally arranged so as to extend along the vertical direction. The holding table 44 is made of an insulating material such as resin.

  The holding table 44 includes a main body 45, a leg 46, and a lid 47. The main body 45 is a part that plays a core role for holding the first relay terminal 43. The main body 45 is formed in a block shape and has a plurality of (three corresponding to the number of first relay terminals 43) through holes 45a extending in the vertical direction. The inner diameter of the through hole 45 a corresponds to the outer diameter of the first relay terminal 43. The first relay terminal 43 is held by the holding base 44 by inserting the lower end portion of the first relay terminal 43 into the through hole 45a.

  Leg portions 46 extending in the vertical direction are provided above the main body 45 in the holding table 44. The leg portion 46 is formed in a thin plate shape that is thinner than the length in the vertical direction. Moreover, the leg part 46 is arrange | positioned at the outer edge part of the main-body part 45 when it sees in an up-down direction. In the present embodiment, the main body portion 45 is formed in a substantially rectangular shape when viewed in the vertical direction (not shown), and the four leg portions 46 respectively correspond to the four sides of the main body portion 45 correspondingly. Has been placed. The main body portion 45 and the four leg portions 46 are integrally formed. Further, the holding base 44 is formed in a tank shape opened upward by the main body 45 and the four legs 46. Further, a hook-like locking piece 46a extending outward in the horizontal direction is provided at the upper end of each leg 46. The leg portion 46 and the locking piece 46a are integrally formed.

  In the present embodiment, the outer peripheral wall 24 of the second case portion 23 is formed with a through hole 24a that allows the inverter storage chamber P (first storage portion P1) and the oil-tight communication space Q to communicate with each other. The wiring unit 40 is provided through the second case portion 23 by arranging the terminal unit 42 in the through hole 24a. Around the through hole 24a on the surface of the outer peripheral wall 24 on the inverter accommodating chamber P side, a receiving portion 24b having an L-shaped cross section toward the center side of the through hole 24a is provided. The holding base 44 is stably fixed by engaging the locking piece 46a with the receiving portion 24b.

  A second relay terminal 49 provided integrally with the connection cable 48 is connected to the lower end portion of the first relay terminal 43. In the present embodiment, a second relay terminal 49 for each phase is provided so as to correspond to the three-phase first relay terminal 43. The second relay terminal 49 is made of a metal strip-shaped conductor plate. Further, a lid 47 is attached to the main body 45 from below so as to cover the connection portion between the first relay terminal 43 and the second relay terminal 49.

  The connection cable 48 electrically connects the terminal unit 42 and the rotating electrical machine MG (coil Co of the stator St). The connection cable 48 is composed of a metal conductor wire and an insulating covering material covering the periphery thereof. The integrated second relay terminal 49 and connection cable 48 are generally arranged so as to extend linearly along the axial direction L. The connection cable 48 is disposed on the outer side in the radial direction of the transmission apparatus TM and at a position overlapping the stator St of the rotating electrical machine MG when viewed in the axial direction L. The connection cable 48 is arranged at a position overlapping only the stator St without overlapping with the rotor Ro when viewed in the axial direction L on the outer side in the radial direction of the rotor Ro. The intermediate wall 22 exists between the transmission TM in the axial direction L and the rotating electrical machine MG. However, the intermediate wall 22 overlaps the connection cable 48 and the stator St when viewed in the axial direction L. Is formed with a through hole 22a penetrating in the axial direction L. And the connection cable 48 which comprises the wiring member 40 is provided through the through-hole 22a formed in the intermediate wall 22 in the oil-tight communication space Q.

  The connection cable 48 is connected to a connection terminal 71 provided on the coil Co. The connection cable 48 for each phase is connected to the connection terminal 71 of the coil Co for each phase. Such a connection terminal 71 is provided in the coil end part Ce which protrudes in the axial direction L from the stator core Sc in the coil Co. In the present embodiment, of the two coil end portions Ce on both sides in the axial direction L, the connection terminal 71 is provided on the coil end portion Ce on the transmission device TM side (second shaft direction L2 side) in the axial direction L. Yes. Accordingly, the connection cable 48 extending in the axial direction L from the internal space of the second case portion 23 disposed on the second axial direction L2 side with respect to the rotating electrical machine MG toward the first axial direction L1 side can be shortened at the shortest distance. It can be connected to the connection terminal 71.

  By the way, in the oil-tight communication space Q formed between the first case portion 21 and the second case portion 23 joined to each other, cooling, lubrication, and the like of the rotating electrical machine MG and the transmission device TM are appropriately performed. A predetermined amount of oil is stored. When the vehicle travels, the oil is scattered in the oil-tight communication space Q, for example, by being scraped up by the differential input gear Gi of the differential gear device DF. On the other hand, the inverter housing chamber P formed between the second case portion 23 and the first cover member 51 and the second cover member 52 that are joined to each other has an electronic component such as the switching element 33 disposed therein. It is necessary to prevent liquids such as oil and oil from entering. Therefore, the vehicle drive device 1 according to the present embodiment includes the first seal member 61 and the second seal member for sealing between the second case portion 23 and the wiring member 40 penetrating the second case portion 23. 62. In the present embodiment, the first seal member 61 and the second seal member 62 each correspond to a “seal member” in the present invention. Further, the vehicle drive device 1 includes a third seal member 63 for sealing between the second case portion 23 and the first cover member 51 and the second cover member 52 joined to the second case portion 23. And a fourth seal member 64 (see FIG. 2).

  As shown in FIG. 6, the first seal member 61 is disposed between the first relay terminal 43 and the through hole 45 a of the main body 45 of the holding base 44. In the present embodiment, the first seal member 61 for each phase is provided so as to correspond to the three-phase first relay terminal 43. As the first seal member 61, an O-ring, an X-ring, or the like made of a rubber material such as nitrile rubber, styrene rubber, silicone rubber, or fluorine rubber can be used. A liquid gasket such as FIPG can also be used. This effectively suppresses the oil in the oil-tight communication space Q from entering the inverter accommodating chamber P through a slight gap between the first relay terminal 43 and the holding base 44 (main body portion 45). be able to.

  As shown in FIG. 6, the second seal member 62 is disposed between the outer peripheral wall 24 of the second case portion 23 and the locking piece 46 a of the leg portion 46 of the holding base 44. In the present embodiment, one second seal member 62 is provided so as to correspond to one holding base 44 that collectively holds the three-phase first relay terminals 43. As the second seal member 62, an O-ring, an X-ring, or the like made of a rubber material such as nitrile rubber, styrene rubber, silicone rubber, or fluorine rubber can be used. A liquid gasket such as FIPG can also be used. This effectively suppresses the oil in the oil-tight communication space Q from entering the inverter housing chamber P through a slight gap between the outer peripheral wall 24 and the holding base 44 (leg portion 46). it can.

  As shown in FIG. 6, the third seal member 63 is disposed on the mating surface between the protruding wall 25 of the second case portion 23 and the first cover member 51. In the present embodiment, the first cover member 51 is joined only to the second case portion 23 without straddling the first case portion 21 and the second case portion 23. For this reason, it is not necessary to consider the level | step difference which may arise unavoidable on manufacture in the location of the mating surface of the 1st case part 21 and the 2nd case part 23, for example. Therefore, as the third seal member 63, a liquid gasket such as FIPG can be used without using a cork gasket, foam rubber, grommet, or the like that can absorb such a step. Of course, an O-ring or an X-ring made of a rubber material may be used, and a cork gasket, foamed rubber, grommet, or the like may be used. Thereby, it is possible to effectively prevent water vapor or the like in the outside air from entering the inverter accommodating chamber P through a slight gap between the second case portion 23 and the first cover member 51.

  As shown in FIG. 2, the fourth seal member 64 is disposed on the mating surface between the outer peripheral wall 24 and the transition wall portion 26 of the second case portion 23 and the second cover member 52. In the present embodiment, the second cover member 52 is joined only to the second case portion 23. As the fourth seal member 64, a liquid gasket such as FIPG can be used. Of course, an O-ring or an X-ring made of a rubber material may be used, and a cork gasket, foamed rubber, grommet, or the like may be used. Thereby, it is possible to effectively prevent water vapor or the like in the outside air from entering the inverter accommodating chamber P through a slight gap between the second case portion 23 and the second cover member 52.

  As described above, in the present embodiment, the wiring member 40 itself (in the broad sense, the second case portion 23 and the wiring member 40 can be obtained by a simple method using the first seal member 61 formed of an O-ring, an X-ring, or the like. A small gap existing between the two can be properly sealed. In addition, a small gap between the second case portion 23 and the wiring member 40 can be appropriately sealed by a simple method using the second seal member 62 made of an O-ring, an X-ring, or the like. Further, the third seal member 63 and the fourth seal member 64 made of a liquid gasket are used for a slight gap without a step between the second case portion 23 and the first cover member 51 and the second cover member 52. Can be properly sealed. Therefore, the seal structure of the inverter accommodating chamber P can be simplified.

[Other Embodiments]
Finally, other embodiments of the vehicle drive device according to the present invention will be described. Note that the configurations disclosed in the following embodiments can be applied in combination with the configurations disclosed in other embodiments as long as no contradiction arises.

(1) In the above-described embodiment, a configuration in which the through hole 22a is formed at a position overlapping the rotating electrical machine MG (specifically, the stator St) when viewed in the axial direction L in the intermediate wall 22 will be described as an example. did. However, the embodiment of the present invention is not limited to this. For example, the through hole 22a may be formed at a position overlapping the rotor Ro without overlapping the stator St when viewed in the axial direction L. Further, the through hole 22a may be formed at a position that is radially outside of the rotating electrical machine MG and does not overlap with the rotating electrical machine MG when viewed in the axial direction L.

(2) In the above embodiment, the configuration in which the intermediate wall 22 is provided at the end portion of the first case portion 21 on the transmission device TM side (the shaft second direction L2 side) has been described as an example. However, the embodiment of the present invention is not limited to this. For example, the intermediate wall 22 may be provided at the end of the second case portion 23 on the rotating electrical machine MG side (the first axial direction L1 side). Further, the intermediate wall 22 may be provided at an arbitrary position in the axial direction L in the first case portion 21 or the second case portion 23.

(3) In the above-described embodiment, as an example, the connection terminal 71 of the coil Co is provided in the coil end portion Ce on the transmission device TM side among the two coil end portions Ce on both sides in the axial direction L. explained. However, the embodiment of the present invention is not limited to this. For example, the connection terminal 71 may be provided in the coil end portion Ce on the internal combustion engine E side.

(4) In the above embodiment, the wiring member 40 including the terminal unit 42 has been described with reference to a specific structure. However, the embodiment of the present invention is not limited to this. For the wiring member 40 (in particular, the terminal unit 42), any specific structure can be employed. In the above embodiment, an example in which the first relay terminals 43 for each phase are collectively held by one holding base 44 is shown, but for example, the first relay terminals 43 for each phase correspond to each phase. The holding table 44 may be held individually. In this case, in other words, the terminal unit 42 for each phase is individually provided. Further, for example, a connection cable or the like may be used for connection between the inverter device 3 and the terminal unit 42. A bus bar or the like may be used for connection between the terminal unit 42 and the rotating electrical machine MG.

(5) In the above embodiment, an example in which the inverter housing chamber P is configured by joining the first cover member 51 and the second cover member 52 to the second case portion 23 has been described. However, the embodiment of the present invention is not limited to this. For example, even if the wall portion corresponding to the second cover member 52 is formed integrally with the second case portion 23 and only the first cover member 51 is joined to the second case portion 23, the inverter accommodating chamber P is configured. good. In this way, the installation of the fourth seal member 64 can be omitted, which is advantageous from the viewpoint of the sealing performance of the inverter accommodating chamber P. However, since it is necessary to sequentially insert the capacitor 36 and the conversion unit 31 from above along the vertical direction, it is necessary to configure the isolation wall 27 so as to be removable or to omit the installation itself.

(6) The above embodiment has been described with the single-shaft transmission TM having the intermediate shaft M as the transmission input shaft and the transmission output gear Go as the transmission output member arranged coaxially. However, the embodiment of the present invention is not limited to this. For example, a multi-shaft transmission TM having a shift input shaft and a shift output member arranged on separate axes may be used. Even in this case, the rotational axis (first axial center X1) of the transmission TM is defined based on the rotational axis of the input shaft (transmission input shaft) of the transmission TM. In this case, “the transmission TM is arranged coaxially with the rotating electrical machine MG” means that the rotational axis of the transmission input shaft and the rotational axis of the rotating electrical machine MG (rotor Ro) coincide with each other. The rotation axis of the output member may not match the rotation axis of the rotating electrical machine MG (rotor Ro).

(7) Regarding other configurations, it should be understood that the embodiments disclosed herein are illustrative in all respects and that the scope of the present invention is not limited thereby. Those skilled in the art will readily understand that modifications can be made as appropriate without departing from the spirit of the present invention. Accordingly, other embodiments modified without departing from the spirit of the present invention are naturally included in the scope of the present invention.

  The present invention can be used for a drive device for a hybrid vehicle, for example.

1: vehicle drive device 2: case 3: inverter device 21: first case portion 22: intermediate wall 22a: through hole 23: second case portion 40: wiring member 51: first cover member (cover member)
52: Second cover member (cover member)
61: First seal member (seal member)
62: Second seal member (seal member)
63: Third seal member 64: Fourth seal member 71: Connection terminal E: Internal combustion engine MG: Rotating electric machine St: Stator Sc: Stator core Co: Coil Ce: Coil end part TM: Transmission device W: Wheel X1: First shaft Core (rotary electric machine rotation axis)
L: Axial direction P: Inverter accommodation chamber Q: Oil-tight communication space (connected oil-tight space)

Claims (3)

A rotating electrical machine that functions as a driving force source for wheels together with the internal combustion engine;
A transmission that is arranged side by side in the axial direction, which is the direction in which the rotational axis of the rotating electrical machine extends, with respect to the rotating electrical machine;
A case including a first case portion that houses the rotating electrical machine and a second case portion that houses the transmission,
An inverter device for controlling the rotating electrical machine;
A wiring member for connecting the rotating electrical machine and the inverter device,
Forming an oil-tight space in which the first case portion and the second case portion communicate with each other, and the second case portion is joined to the side of the first case portion opposite to the internal combustion engine side in the axial direction;
Between the second case portion and the cover member joined to the second case portion, an inverter accommodating chamber for accommodating the inverter device is formed,
The rotating electrical machine is accommodated in the oil-tight space,
The wiring member is provided through the second case portion so as to extend over the inverter accommodating chamber and the oil-tight space;
A vehicle drive device including a seal member that seals between the second case portion and the wiring member. The case further includes an intermediate wall disposed between the rotating electrical machine and the transmission in the axial direction,
The wiring member is provided through a through hole formed in the intermediate wall in the oil-tight space;
The vehicle drive device according to claim 1, wherein the through hole is formed at a position overlapping the rotating electrical machine when viewed in the axial direction. The rotating electrical machine has a stator including a stator core and a coil disposed on the stator core,
The coil has two coil end portions protruding from the stator core on both sides in the axial direction,
3. The vehicle drive device according to claim 1, wherein a connection terminal of the coil with the wiring member is provided in a coil end portion on the transmission side in the axial direction of the two coil end portions. .

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