JP2012139000A - Vehicle drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle drive device that can, while being capable of sufficiently performing lubrication and cooling of a rotary electric machine, achieve downsizing and reduce manufacturing cost.SOLUTION: An in-wheel motor drive device 1 includes in a case 2: a motor 3 having a stator 4 whose coil ends 4b, 4bare protruded from a stator steel plate 4a and a rotor 5 fixed onto a rotor shaft 7; a terminal block 10 for positioning and supporting the wiring electrically connected with the coil end 4b; and a deceleration gear shaft 25 and a deceleration planetary gear 40 that are disposed on an axis in parallel with the rotor shaft 7, drive-connected with the rotor shaft 7, and part of which is immersed in an oil sump. On the terminal block 10, a side wall 10c is provided that is erected at the opposite side to the motor 3 in the axial direction. A collecting part 10A of the oil that collects the drawn-up oil from the oil sump by the rotation of the deceleration gear shaft 25 and the deceleration planetary gear 40 to guide it to the motor 3 side.

Description

  The present invention relates to a vehicle drive device equipped with a rotating electric machine such as a hybrid drive device, an electric vehicle drive device, an in-wheel motor drive device and the like mounted on, for example, a hybrid vehicle, an electric vehicle, and the like. The present invention relates to a vehicle drive device having an oil circulation structure that cools or lubricates a rotating electrical machine, a bearing, and the like on another shaft by oil scooped up by a rotating member immersed in a pool.

  In recent years, motor generators (hereinafter simply referred to as “motors”) such as hybrid drive devices, electric vehicle drive devices, in-wheel motor drive devices, and the like have been installed in order to improve vehicle fuel efficiency and environmental performance. Various vehicle drive devices have been proposed. Many of the drive devices equipped with such a motor have a shaft on which the motor is disposed and a shaft on which a rotation system such as an output shaft is disposed in parallel. In the case where the oil is disposed above the oil reservoir in the interior, the oil accumulated in the oil reservoir is guided (raised) to cool the motor and lubricate the bearings supporting the rotor shaft. Lubrication structure is required.

  For example, Patent Document 1 describes a hybrid drive device in which a space above the motor (2) and having a bowl-like shape is formed, and oil scooped up from an output shaft gear is supplied to the bowl (90a, 90b), the oil is guided to the opposite side of the motor in the axial direction, and it is possible to lubricate and cool the bearing that supports the rotor shaft and the brake device (6) disposed on the inner peripheral side of the motor. Has been proposed.

  Further, for example, Patent Document 2 is an in-wheel motor drive device in which oil in an oil tank (61) is sucked by an oil pump (63) driven by a motor (22), and the motor is driven by an oil delivery pipe (73). Oil is guided to above (22), and the oil is directed from the plurality of distribution holes (80) formed in the oil delivery pipe (73) toward the coil end (28a) of the stator coil and the bearings (24, 26, 41). Have been proposed to lubricate and cool them.

JP 2005-83471 A JP 2009-12523 A

  However, in the case where the case is formed like a bowl as in Patent Document 1, a relatively large space isolated by the double wall structure is formed inside the apparatus, which only hinders the compactness of the driving apparatus. However, since the shape of the case is complicated, there is a problem that, for example, the case mold or the like also has a complicated shape, which hinders a reduction in manufacturing cost.

  Further, as in the above-mentioned Patent Document 2, an oil pump, an oil delivery pipe, or the like is provided with a space for disposing the oil pump, the oil delivery pipe, and the like, which similarly hinders the compactness of the drive device. However, there is a problem that the number of parts such as the oil pump and the oil delivery pipe increases, which also hinders the manufacturing cost reduction.

  Accordingly, an object of the present invention is to provide a vehicle drive device that can sufficiently reduce the manufacturing cost while allowing sufficient lubrication and cooling of the rotating electrical machine. To do.

The present invention (see, for example, FIGS. 1 to 4) includes a rotating electrical machine (3) having a stator (4) and a rotor (5) fixed on the rotor shaft (7), and a shaft of the rotating electrical machine (3). A terminal block (10) for positioning and supporting a wiring (11) that is disposed on one side in the direction and is electrically connected to the rotating electrical machine (3); and a rotor that is disposed on an axis parallel to the rotor shaft (7). In the vehicle drive device (1) provided with a rotating member (25, 40) drivingly connected to the shaft (7) and partially immersed in an oil reservoir in the case (2),
The terminal block (10) includes a side wall (10c) erected on the opposite side in the axial direction from the rotating electrical machine (3), and is scraped up from the oil reservoir by the rotation of the rotating member (25, 40). And a collecting portion (10A) that collects the oil and guides the oil to the rotating electrical machine (3) side in the axial direction by the side wall (10c).

In the present invention (see, for example, FIGS. 1 to 3), the stator (4) has coil ends (4b ₁ , 4b ₂ ) protruding from the stator steel plate (4a), and the stator steel plate (4a) And a fixing portion (4c) that protrudes to the outer peripheral side from the cylindrical portion (4d) around which the stator winding is wound and is fixed to the case (2) above the rotor shaft (7),
The case (2) accommodates a fixed portion (4c) of the stator steel plate (4a) and has a groove (D) along the axial direction of the fixed portion (4c). (2a)
The collecting part (10A) of the terminal block (10) is disposed on one axial side of the gap (D) and covers the outer peripheral side of the coil end (4b ₂ ), so that the stator steel plate (4a). A guide plate (10f) that comes into contact with
The gap (D) is used as an oil passage that conducts oil collected in the collecting part (10A) to the opposite side of the terminal plate (10) of the stator steel plate (4a) in the axial direction. And

Further, according to the present invention (see, for example, FIGS. 2 and 4), the gap (D) between the groove (2a) of the case (2) and the fixed portion (4c) of the stator steel plate (4a) Formed on the back side of the flow direction (Q ₁ ) of the oil scraped up by the rotating member (25, 40) with respect to the fixed portion (4c),
The collecting part (10A) of the terminal block (10) is configured such that the back side of the flow direction (Q ₁ ) of the oil to be scraped is covered with the inner surface of the case (2) and the flow direction of the oil to be scraped up It has an axial wall (10e) erected with respect to the axial direction so that there is a gap (d) for introducing oil between the inner surface of the case (2) and on the front side of (Q ₁ ). It is characterized by that.

In the present invention (see, for example, FIGS. 2 and 3), the fixing portion (4c) of the stator steel plate (4a) has a bolt hole (4e) into which the bolt (15) is inserted, and the bolt (15 ) Is fastened to the case (2) by
In the terminal block (10), the end surface (10i) on the stator steel plate (4a) side in the axial direction is in contact with the fixed portion (4c) of the stator steel plate (4a) and the front end surface of the guide plate (10f) ( 10j), and a fastening portion (10g) that is fastened to the case (2) together with the fastening portion (10c) of the stator steel plate (4a) by the bolt (15). Features.

  Further, according to the present invention (see, for example, FIG. 1), the rotor shaft (7) is opposite to the case (2), and the terminal block (10) is opposite to the rotating electrical machine (3) in the axial direction. And a bearing (b1) that is rotatably supported.

  In addition, although the code | symbol in the said parenthesis is for contrast with drawing, this is for convenience for making an understanding of invention easy, and has no influence on the structure of a claim. It is not a thing.

  According to the first aspect of the present invention, the terminal block for positioning and supporting the wiring that conducts to the rotating electrical machine has the collecting portion that collects the oil scraped up by the rotation of the rotating member and guides it to the rotating electrical machine side. Therefore, it is possible to sufficiently lubricate and cool the rotating electrical machine while eliminating the need for a dedicated device (such as an oil pump) to guide the oil to the rotating electrical machine, and to prevent the case from having a complicated shape. Therefore, the vehicle drive device can be made compact, and the manufacturing cost can be reduced.

  According to the second aspect of the present invention, the axial gap formed between the groove portion of the case and the fixing portion of the stator steel plate is conducted to the opposite side in the axial direction through the oil collected in the collecting portion of the terminal block. For example, it is not necessary to make the case a double structure, and it is not necessary to provide a special oil passage, etc., so that the vehicle drive device can be made compact. However, for example, since it is not necessary to form the case in a complicated shape, the manufacturing cost can be reduced.

  According to the third aspect of the present invention, the collecting part of the terminal block is covered with the inner surface of the case at the back side in the flow direction of the oil to be scraped, and the oil is introduced between the inner surface of the case and the front side. Since the axial wall is erected with respect to the axial direction so that there is a gap, the oil that is scraped up enters the collecting part from the gap and does not flow down to the near side by the axial wall. Oil can be collected in the collection part.

  According to the fourth aspect of the present invention, the terminal block has an end surface on the stator steel plate side in the axial direction that is in contact with a fixed portion of the stator steel plate and is formed on the same plane as the front end surface of the guide plate, and is a stator steel plate by bolts. Since there is a joint fastening part that is fastened together with the case together with the fastening part, the guide plate and the stator steel plate can be brought into close contact with each other by simply fastening the joint fastening part with a bolt. There is no need to interpose a seal member or the like, and the number of parts can be reduced.

  According to the fifth aspect of the present invention, in the bearing that rotatably supports the rotor shaft with respect to the case on the side opposite to the axial rotating electric machine with respect to the terminal block, oil is scraped up by the rotating member. Since it is on the opposite side in the axial direction across the position and the rotating electrical machine, it is difficult to apply oil directly, but the oil is collected by the collecting part of the terminal block, and the groove part of the case and the fixing part of the stator steel plate Since the collected oil is guided through an axial gap (oil passage) formed between the two, the bearing can be sufficiently lubricated.

Front sectional drawing which shows the in-wheel motor drive device which concerns on this Embodiment. The partial notch side view which shows this in-wheel motor drive device. AA arrow sectional drawing of FIG. BB arrow sectional drawing of FIG.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to FIGS. First, the structure of an in-wheel motor drive device that is an example of a vehicle drive device according to the present invention will be described with reference to the drawings. The in-wheel motor drive device 1 is a four-wheel drive vehicle that is mounted in a wheel that was a driven wheel of a drive device of an electric vehicle, a drive device of a series type hybrid vehicle, a parallel type or a split type hybrid vehicle, for example. It can be used as a driving device for changing to the above.

  As shown in FIG. 1, the in-wheel motor drive device 1 is roughly arranged in a case 2 in which an motor 3, a reduction gear mechanism 20, a resolver 30, a reduction planetary gear 40, an output shaft 50 to which a wheel hub 51 is fixed, and the like. It is configured with. The case 2 has a size that can be accommodated in an inner diameter portion of a wheel (not shown) constituting the wheel together with, for example, a disc brake and a caliper (not shown), and an arm (not shown) that is absorbed by a suspension device or the like. Etc.) and is supported in a form having a predetermined movable region with respect to the vehicle body.

  The case 2 includes a main case 2A that accommodates most of the main components, a case cover 2B that closes the main case 2A, and a lid that allows adjustment from the outside of the resolver 30 installed in the case cover 2B. The member 2 </ b> C includes a sealing structure in which oil is sealed by sealing an outer peripheral side of an output shaft 50 described later in detail. The case 2 includes a motor / generator 3, a terminal block 10, a reduction gear mechanism 20, a resolver 30, a reduction planetary gear 40, and a part of an output shaft 50 which will be described later.

A motor / generator (rotary electric machine) 3 is disposed above the main case 2A. A motor / generator 3 (hereinafter simply referred to as “motor 3”) includes a stator 4 fixed to the case 2 and a rotor 5 fixed on a rotor shaft 7 that is rotatably supported by the case 2. It is configured. The stator 4 includes a stator steel plate 4a formed by laminating a large number of steel plates, and a large number of stator windings inserted into a plurality of slits (not shown) formed in the stator steel plate 4a. (Hereinafter, simply referred to as “axial direction”) and coil ends 4b ₁ and 4b ₂ which are portions that protrude and fold back. That is, the laminated stator steel plates 4a have a cylindrical portion 4d (see FIG. 2), and a stator winding is wound around a slit formed in the cylindrical portion 4d to form a stator coil. Both end portions thereof are coil ends 4b ₁ and 4b _{2 of the} stator coil.

  In addition, as shown in FIG. 2, on the outer peripheral side of the cylindrical portion 4d of the stator steel plate 4a, a fixed portion 4c protruding in a U shape at two locations (substantially up and down positions) with respect to the center of the circle. Is formed. Of these two fixed portions 4c, the upper fixed portion 4c is, as shown in FIG. 2, formed in a concave groove 2a formed on the inner peripheral surface of the main case 2A on one side in the circumferential direction. It is stored in a form with a gap D. Further, as shown in FIG. 3, the fixing portion 4c has a bolt hole 4e, and a bolt 15 is fitted into the bolt hole 4e to form a female screw portion formed in the thick portion 2b of the case 2. When the bolt 15 is screwed to 2c, it is fastened to the case 2 together with the terminal block 10 which will be described in detail, that is, the stator 4 is positioned and fixed to the case 2. Similarly, there is a gap E between the lower fixing portion 4c and the groove 2a (see FIGS. 1 and 2).

  In addition, when forming the groove part 2a which accommodates the fixing | fixed part 4c of the stator steel plate 4a in the main case 2A, this groove part is accurately provided so that the inner peripheral surface of the groove 2a is in close contact with the outer surface of the fixing part 4c of the stator steel plate 4a. It is difficult to form 2a, that is, the gaps D and E may be designed in advance so as to form a gap, but they are formed even if they are not designed.

  On the other hand, as shown in FIG. 1, the rotor 5 has a cylindrical rotor core 5a in which steel plates are laminated in the same manner as the stator steel plate 4a. A plurality of through holes (not shown) are formed in the rotor core 5a in the axial direction, and permanent magnets (not shown) are inserted and embedded in the respective through holes. On both sides in the axial direction of the rotor core 5a, annular end plates 6A and 6B are disposed, and the end plate 6A is in contact with a flange portion 7a formed on the rotor shaft 7. Further, the end plate 6B is fastened to the flange portion 7a by a nut 8 screwed to the rotor shaft 7, whereby the rotor core 5a is integrally fixed on the rotor shaft 7.

  The rotor shaft 7 includes a ball bearing b1 fitted on the inner diameter side of an annular protrusion 2d formed on the inner surface of the main case 2A, and an inner diameter of a hollow portion of the hollow plate portion 2g formed on the case cover 2B. The ball bearing b2 fitted to the side is rotatably supported so as to have a so-called both-end supported structure. On the opposite side of the rotor shaft 7 from the rotor core 5a, a small-diameter gear 21 serving as a reduction gear mechanism 20 is spline-fitted to the rotor shaft 7 so as not to rotate relative thereto, and a nut together with a ball bearing b2. 9 is fastened to the stepped portion 7 b of the rotor shaft 7. Further, the resolver rotor 32 of the resolver 30 is fastened and fixed to the tip end portion (left tip side in FIG. 1) of the rotor shaft 7 by a nut 33.

  As shown in FIG. 2, the annular protrusion 2d into which the ball bearing b1 is fitted opens in the direction (upper portion) toward the gap D, and is substantially in side view from the opened portion. Two guide ribs 2e, 2e each having a V-shape are extended to collect and guide oil flowing from the gap D to the ball bearing b1.

  As shown in FIG. 2, the motor 3 and the rotor shaft 7 are arranged so as to be positioned above the front side in the traveling direction of the vehicle with respect to a reduction gear shaft 25 and an output shaft 50 described later.

  As shown in FIG. 1, the resolver 30 includes a resolver stator 31 fixed to the lateral outer surface (left side in FIG. 1) of the case cover 2B, and a resolver rotor 32 fixed to the rotor shaft 7. It is comprised. The resolver 30 is covered with a lid member 2C that is detachably fixed to the case cover 2B. After the in-wheel motor drive device 1 is manufactured, the lid member 2C is removed and the nut 33 is loosened. Thus, the phase (angle) of the resolver rotor 32 with respect to the rotor shaft 7 can be adjusted.

  On the other hand, the reduction gear mechanism 20 includes the small-diameter gear 21 fixed to the rotor shaft 7 described above, an idler gear 22 that meshes with the small-diameter gear 21, and a large-diameter gear 25a of the reduction gear shaft 25 that meshes with the idler gear 22. It is comprised. The idler gear 22 is rotatably supported by an idler shaft 23 via a needle bearing b3. The idler shaft 23 has a bolt 24 inserted into a bolt hole 23a, and the bolt 24 is a female screw 2f of the case 2. By being screwed together, the case 2 (case cover 2B) is fastened and fixed.

  The large-diameter gear 25 a is configured as a gear by forming an outer peripheral surface of a portion formed in a flange shape from the reduction gear shaft (rotating member) 25 as a tooth surface meshing with the idler gear 22. The reduction gear shaft 25 is on an axis parallel to the rotor shaft 7, one end is rotatably supported by the ball bearing b4 with respect to the case 2, and the other end is an output shaft to be described later by the ball bearing b5. 50 and a hub bearing 52 are rotatably supported with respect to the case 2. The reduction gear shaft 25 is drivingly connected to the rotor shaft 7 via the reduction gear mechanism 20. A tooth surface of the sun gear 25b as the speed reduction planetary gear 40 is formed on the outer peripheral surface of the speed reduction gear shaft 25 on the ball bearing b5 side (right side in FIG. 1).

  As shown in FIG. 2, the reduction gear mechanism 20 is arranged so that the centers of the small-diameter gear 21, the idler gear 22, and the large-diameter gear 25a are in a straight line when viewed from the side. As shown, in the axial direction (in front view), the motor 3 and the speed reduction planetary gear 40 and the side surface of the case cover 2B are arranged so as to be in a straight line.

  The reduction planetary gear (rotating member) 40 includes the sun gear 25b, a pinion gear 43 that meshes with the sun gear 25b, and a ring gear 41 that meshes with the pinion gear 43. The pinion gear 43 includes a side plate 42 and an output shaft. The pinion shaft 44 spanned between 50 flange portions 50d is rotatably supported, and the pinion gear 43, the pinion shaft 44, the side plate 42, and the flange portion 50d constitute an integral carrier 46. The ring gear 41 is configured such that, in the main case 2A, a reduction cylindrical planetary gear 40, a semi-cylindrical partition wall 2h (see FIG. 2) formed between the output shaft 50 and the motor 3, and a semi-cylindrical bottom 2i are combined. The cylindrical portion is fixed to be non-rotatable by spline fitting while being held between the main case 2A and the snap ring 45.

  In the space sealed by the bottom 2i of the main case 2A and the case cover 2B, oil is accumulated at a liquid surface having a predetermined height. In particular, at least a part of the large-diameter gear 25a and the speed reduction planetary gear 40 are accumulated in the oil reservoir. Soaked in Therefore, as will be described in detail later, when the in-wheel motor drive device 1 is rotationally driven, the oil is scraped up by the large diameter gear 25a and the reduction planetary gear 40. Although not shown in FIG. 1, it is preferable to attach a blade-like member to the side surface (side surface on the large-diameter gear 25a side) of the side plate 42 of the carrier 46 to increase the amount of oil to be scooped up.

  As described above, the output shaft 50 is formed with a flange-shaped flange portion 50d constituting a part of the carrier 46 at the end portion on the axial reduction planetary gear 40 side, and the inner periphery of the flange portion 50d. The ball bearing b5 is fitted on the side. The output shaft 50 is formed as a large-diameter portion 50c having a large diameter on the opposite side of the flange planetary gear 40 from the speed reduction planetary gear 40, and an intermediate portion is formed as a small-diameter portion 50b having a smaller diameter than the large-diameter portion 50c. Further, a tip portion 50a having a smaller diameter than the small diameter portion 50b is formed at the tip portion.

  A sleeve 54 is fitted to the outer peripheral surface of the large-diameter portion 50c of the output shaft 50, and a seal is provided between the sleeve 54 and the cylindrical portion of the main case 2A constituted by the partition wall 2h and the bottom portion 2i. A ring 55 is provided to ensure the sealing property of the oil reservoir and prevent relics from entering from the outside. A wheel hub 51 is spline-fitted to the outer peripheral surface of the small-diameter portion 50b of the output shaft 50, and the wheel hub 51 is prevented from coming off by screwing a nut 53 to the tip portion 50a of the output shaft 50. It is fixed.

  A hub bearing 52 is fitted on the outer peripheral side of the hollow sleeve portion 51a of the wheel hub 51, that is, the wheel hub 51 and the output shaft 50 are rotatably supported with respect to the case 2. Yes. The hub bearing 52 is sandwiched between the main case 2A by a snap ring 56, abuts against a side surface of the sleeve 54, and an end on the opposite side of the sleeve 54 abuts on the flange portion 50d. The positioning support accuracy in the axial direction of the output shaft 50 is ensured satisfactorily.

  A hub portion 51b formed in a disk shape is provided at an end portion in the axial direction of the wheel hub 51. Bolts (not shown) are provided in a plurality of bolt holes 51c formed in the hub portion 51b. Is inserted, and a wheel (not shown) is fastened to the bolt with a nut to form a wheel.

Next, the structure of the terminal block 10 which is a main part of the present invention will be described. The terminal block 10 is made of, for example, resin, and is disposed on one side in the axial direction of the motor 3 so as to cover a part of the side and upper side of the coil end 4b ₂ of the stator 4 as shown in FIGS. In particular, it is arranged at a position overlapping with the large-diameter gear 25a and the reduction planetary gear 40 of the reduction gear shaft 25 in the axial direction (in the radial direction view).

  The terminal block 10 has a semi-disc-shaped substrate 10a, and three wiring holes 10b are formed in the substrate 10a at predetermined intervals in the circumferential direction. Each of the wiring holes 10b is connected to, for example, ends of three wirings 11 connected to the stator windings of the u, v, and w phases, that is, the terminal block 10 is connected to the stator 4 of the wiring 11. Supports positioning in the phase direction.

  The three wires 11 are converged on a rubber bush 12 fitted in a through hole 2j formed on the side surface of the main case 2A, as shown in FIG. The power supply and the inverter circuit (not shown) are connected from 12a.

On the other hand, the peripheral edge of the board 10a of the terminal block 10 has an edge 10d formed in a semi-cylindrical shape extending in the axial direction, and the tip of the edge 10d on the motor 3 side. Is arranged between the coil end 4b ₂ of the stator 4 and the inner surface of the main case 2A. In the upper part of the edge 10d, the part opposite to the motor 3 in the axial direction (the end on the left side in FIG. 1) has an outer periphery at a position corresponding to the gap D in the circumferential direction. A side wall 10c erected on the side is provided.

Further, in the axial direction of the motor 3 side (FIG. 1 the right side in) from the side wall 10c, the guide plate 10f so as to cover the outer peripheral side portion of the coil end 4b ₂ are formed. Further, as shown in FIG. 3, a bolt hole 10h through which the bolt 15 is penetrated is formed from the front end portion of the guide plate 10f on the motor 3 side at a position overlapping the fixing portion 4c of the stator steel plate 4a in a side view. A joint fastening portion 10g is extended. The co-clamping fixing portion 10g has an end surface 10i on the side of the stator steel plate 4a in the axial direction abutting on the fixing portion 4c of the stator steel plate 4a, and is formed on the same surface as the tip surface 10j of the guide plate 10f. As a result, the fixing portion 4c of the stator steel plate 4a and the female screw portion 2c of the main case 2A are fastened together.

Further, in the circumferential direction of the guide plate 10f, on the fixed portion 4c side of the stator steel plate 4a, as shown in FIG. 4, there is a gap d for introducing oil between the inner surface of the main case 2A. And the axial direction wall 10e erected so as to connect the side wall 10c to the co-tightening fixing portion 10g in the axial direction is formed. That is, the large-diameter gear 25a and the reduction planetary gear 40 by scooped up oil for the reduction gear shaft 25 is, as it flows in the arrow Q ₁ direction, the gap D whereas the fixing part 4c, the oil flow direction Q ₁ is formed on the rear side, said axial wall 10e is, in the front side of the flow direction to Q ₁ the oil, which is installed to lie a gap (d) introducing an oil.

  The terminal block 10 configured as described above captures a box-shaped oil surrounded by the guide plate 10f, the side wall 10c, the axial wall 10e, and the inner surface of the groove 2a of the main case 2A. A collecting portion 10A is formed.

  Next, the operation of the in-wheel motor drive device 1 will be described. For example, when a control unit (not shown) starts the power running control of the motor 3 based on the driver's accelerator operation or the like, electric power is supplied from the power source and the inverter circuit to the stator 4 of the motor 3 via the wiring 11, and the rotor 5 Driven by rotation. Then, the rotor shaft 7 is rotationally driven, and the rotation of the rotor shaft 7 is decelerated and transmitted from the small diameter gear 21 to the large diameter gear 25a of the reduction gear shaft 25 via the idler gear 22. Further, when the sun gear 25b of the reduction gear shaft 25 is driven to rotate, in the reduction planetary gear 40, the carrier 46 is further reduced through a ring gear 41 whose rotation is fixed, and the reduced rotation of the carrier 46 is output. The wheel is transmitted to the shaft 50 and the wheel hub 51, that is, the wheel is rotationally driven as a driving force of the vehicle.

  On the other hand, for example, when a control unit (not shown) starts regenerative control based on the driver's accelerator operation, brake operation, or the like, the output shaft 50 and the wheel hub 51 are rotationally driven by the vehicle's inertial force or the like, and the deceleration planetary gear 40 is driven. The sun gear 25b of the reduction gear shaft 25 is rotated at an increased speed through the ring gear 41 whose rotation is fixed in the form reversely inputted to the carrier 46. Further, the rotation of the reduction gear shaft 25 is transmitted to the small diameter gear 21 through the large diameter gear 25 a and the idler gear 22 as a speed increasing rotation, the rotor shaft 7 is driven to rotate, and the rotation of the rotor 5 is counteracted by the counter electromotive force to the stator 4. The power is supplied from the wiring 11 to the power supply via the inverter circuit or the like, and the power supply is charged.

As described above, even when the motor 3 is subjected to power running control or regenerative control, the rotation direction of the output shaft 50 is forward rotation when the vehicle is traveling forward, that is, the speed reduction gear shaft 25 and the speed reduction planetary gear 40 are The direction of rotation is one direction. In this forward traveling state, as shown in FIG. 2, the reduction gear shaft 25 and the reduction planetary gear 40 rotate in the direction indicated by the arrow ω, and the oil in the oil reservoir is moved by the arrow Q ₁ by the large-diameter gear 25a and the reduction planetary gear 40. Scooped up in the direction.

Some of the oil scooped up toward the arrow Q ₁ direction, as shown in FIG. 4, through the gap d between the axial wall 10e and the main case 2A, against the inner surface of the main case 2A above It collects in the form which falls to the collected part 10A. At this time, trapped by the trapping portion 10A oil, as shown in FIG. 1, the motor 3 by the side walls 10c is restricted in the axial direction opposite, and by axial wall 10e in the arrow Q ₁ direction It is restricted to the direction of reverse flow (see FIG. 2), the guide plate 10f abutting the stator steel 4a, without falling into the coil end 4b _2, as indicated by the arrow Q ₂ direction, the form used as an oil passage It is guided to the outer peripheral side of the stator steel plate 4 a through the gap D, and further to the upper side of the coil end 4 b _{1 on} the opposite side in the axial direction from the terminal block 10 across the motor 3.

Among the oil scooped up toward the arrow Q ₁ direction (the majority of the scooped up oil) was collected in the collecting unit 10A oil, the coil end 4b ₂ of the stator 4, The power is supplied to the reduction gear mechanism 20, the ball bearing b2, and the like to cool or lubricate them.

Meanwhile, the oil guided to the upper side of the coil end 4b ₁ as indicated by an arrow Q ₂ direction, while cooling the coil end 4b _1, the annular projection 2d of the main case 2A as shown by the arrow Q ₃ directions 2 and further guided by the guide ribs 2e and 2e shown in FIG. 2 to the ball bearing b1 fitted on the inner peripheral side of the annular projection 2d, thereby lubricating the ball bearing b1. Oil that has lubricated the ball bearing b1, as shown by the arrow Q ₄ direction, while cooling the coil end 4b ₁ again, be between the partition wall 2h and the stator 4 of the main case 2A, the lower side of the stator steel plates 4a The oil passes through a gap E between the fixed portion 4c and the groove portion 2a and is returned to the oil sump.

As described above, according to the present in-wheel motor drive device 1, the large-diameter gear 25 a of the reduction gear shaft 25 and the reduction planetary gear 40 are mounted on the terminal block 10 that positions and supports the wiring 11 that is electrically connected to the coil end 4 b ₂ of the stator 4. 10A has a collecting part 10A that collects the oil scraped up by the rotation of the oil and guides it to the motor 3 side, so that a dedicated device (for example, an oil pump) for guiding the oil to the motor 3 is not required. Since the motor 3 can be sufficiently lubricated and cooled, and the case can be prevented from having a complicated shape, the in-wheel motor drive device 1 can be made compact and the manufacturing cost can be reduced. Reduction can be achieved.

  Further, the oil collected in the collecting portion 10A of the terminal block 10 is conducted to the opposite side in the axial direction through the axial gap D formed between the groove portion 2a of the case 2 and the fixing portion 4c of the stator steel plate 4a. Since it is used as an oil passage, for example, the case does not need to have a double structure, and a special oil passage or the like does not need to be newly provided, so that the in-wheel motor drive device 1 can be made compact. However, since it is not necessary to form the case 2 in a complicated shape, for example, the manufacturing cost can be reduced.

Furthermore, collecting portions 10A of the terminal block 10, together with the inner side of the oil flow direction Q ₁ scooped up is covered on the inner surface of the case 2, to introduce the oil between the front side, the case 2 of the inner surface gap Since the axial wall 10e erected with respect to the axial direction is formed so as to have d, the oil that has been scraped up enters the collecting portion 10A from the gap d and is moved forward by the axial wall 10e. Oil can be collected in 10 A of this collection part so that it may not flow down.

  The terminal block 10 has an end surface 10i on the side of the stator steel plate 4a in the axial direction that is in contact with the fixed portion 4c of the stator steel plate 4a and is flush with the tip surface 10j of the guide plate 10f. Since it has the joint fastening part 10g fastened together with the case 2 together with the fastening part 4c of 4a, the guide plate 10f and the stator steel plate 4a can be accurately connected only by fastening the joint fastening part 10g with the bolt 15. It is possible to achieve good contact, and in particular there is no need to interpose a seal member or the like, and the number of parts can be reduced.

  A ball bearing b1 that rotatably supports the rotor shaft 7 with respect to the case 2 on the side opposite to the motor 3 in the axial direction with respect to the terminal block 10 is a large-diameter gear 25a of the reduction gear shaft 25 or a reduction gear. Since it is on the opposite side in the axial direction across the motor 3 and the position where the oil is scraped up by the planetary gear 40, it is difficult to apply the oil directly, but the oil is collected by the collecting part 10A of the terminal block 10, Since the collected oil is guided through the axial gap D formed between the groove 2a of the case 2 and the fixed portion 4c of the stator steel plate 4a, the ball bearing b1 can be sufficiently lubricated. It can be.

  In the present embodiment described above, the in-wheel motor drive device 1 has been described as an example of a vehicle drive device including a motor. However, a terminal block for positioning and supporting the motor and wiring for supplying power to the motor is provided. The present invention can be applied to any drive device such as a hybrid drive device and an electric vehicle drive device.

  Further, in the present embodiment, the collection part 10A of the terminal block 10 has been described as having a box shape surrounded by the side wall 10c, the axial wall 10e, the inner surface of the case 2, and the guide plate 10f. The shape is not limited, and any shape may be used as long as the oil scooped up from the oil reservoir can be collected and guided to the motor 3 side in the axial direction.

  In the present embodiment, the motor 3 and the speed reduction planetary gear 40 are arranged on the same side in the axial direction with respect to the speed reduction gear mechanism 20, that is, the motor 3 and the speed reduction planetary gear 40 overlap in the radial direction. Although the thing was demonstrated, even if the motor and the reduction planetary gear are arrange | positioned on the opposite side of an axial direction (alternately in an axial direction) with respect to a reduction gear mechanism like the thing of patent document 2, for example, The present invention can be similarly applied in that the coil end and the bearing hidden behind the motor 3 are cooled or lubricated with the oil collected by the collecting part of the terminal block.

  Furthermore, in the present embodiment, the reduction gear mechanism has been described as comprising the small diameter gear 21, the idler gear 22, and the large diameter gear 25a. For example, the rotation of the rotor shaft 7 is transmitted to the reduction planetary gear via a belt or chain. The configuration may be as follows.

  In this embodiment, the rotor shaft 7 and the reduction gear shaft 25 are rotatably supported by ball bearings, and the idler gear is rotatably supported by needle bearings. It goes without saying that it may be something like this.

  Moreover, although the in-wheel motor drive device 1 which concerns on this Embodiment shown in FIG. 1 thru | or FIG. 4 is fundamentally mounted in the left wheel with respect to a vehicle advancing direction, naturally, it mounts in each left and right wheel. The in-wheel motor drive device 1 to be mounted on the left wheel is the one in which the left-right direction (axial direction) is reversed (the shape shown on the mirror surface) in FIGS.

1 Vehicle drive device (in-wheel motor drive device)
2 Case 2a Groove 3 Rotating electrical machine (motor)
4 Stator 4a Stator steel plate 4b ₁ , 4b ₂ Coil end 4c Fixed part 4d Cylindrical part 4e Bolt hole 5 Rotor 7 Rotor shaft 10 Terminal block 10A Collection part 10c Side wall 10e Axial wall 10f Guide plate 10g Co-clamping fixed part 10i End face 10j Tip surface 11 Wiring 15 Bolt 25 Rotating member (Reduction gear shaft)
40 Rotating member (reduction planetary gear)
D Clearance Q ₁ Flow direction of oil to be scraped up b1 Bearing (ball bearing)
d gap

Claims (5)

A rotating electrical machine having a stator and a rotor fixed on the rotor shaft; a terminal block disposed on one side in the axial direction of the rotating electrical machine for positioning and supporting a wiring that conducts to the rotating electrical machine; and parallel to the rotor shaft In a vehicle drive device provided in a case, a rotating member that is disposed on a shaft and is drivingly connected to the rotor shaft and partially immersed in an oil reservoir.
The terminal block includes a side wall erected on the opposite side of the rotating electrical machine in the axial direction, collects oil scraped up from the oil reservoir by the rotation of the rotating member, and rotates in the axial direction by the side wall. Having a collection part leading to the electric machine side,
A vehicle drive device characterized by that. The stator has a coil end protruding from the stator steel plate, and the stator steel plate protrudes to the outer peripheral side from the cylindrical portion around which the stator winding is wound, and is fixed to the case above the rotor shaft. A fixing part
The case has a groove portion that houses a fixed portion of the stator steel plate and has a gap with the fixed portion along the axial direction of the fixed portion,
The collection part of the terminal block has a guide plate that is disposed on one side in the axial direction of the gap and that covers the outer peripheral side of the coil end and contacts the stator steel plate,
The gap was used as an oil passage that conducts oil collected in the collection part to the opposite side of the terminal plate of the stator steel plate in the axial direction.
The vehicle drive device according to claim 1. The gap between the groove portion of the case and the fixed portion of the stator steel plate is formed on the inner side in the flow direction of the oil scraped up by the rotating member with respect to the fixed portion,
The collecting part of the terminal block is covered with the inner surface of the case with the back side in the flow direction of the oil to be scraped, and between the inner surface of the case and on the near side in the flow direction of the oil to be scraped up An axial wall erected with respect to the axial direction so as to have a gap for introducing oil into the
The vehicle drive device according to claim 2. The fixed portion of the stator steel plate has a bolt hole into which a bolt is inserted, and is fastened to the case by the bolt.
The terminal block has an end surface on the stator steel plate side in the axial direction that is in contact with the fixed portion of the stator steel plate and is formed on the same plane as the tip surface of the guide plate, and together with the fixed portion of the stator steel plate by the bolt Having a fastened fastening part fastened to the case;
The vehicle drive device according to claim 2 or 3, wherein A bearing that rotatably supports the rotor shaft with respect to the case on a side opposite to the rotating electric machine in the axial direction with respect to the terminal block,
The vehicle drive device according to claim 2, wherein the vehicle drive device is a vehicle drive device.

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