JP2014059044A - Driving device - Google Patents

Abstract

Provided is a drive device that makes it unnecessary to provide a notch in a boss portion and can reduce the amount of lubricating oil enclosed in a case member.
An in-wheel motor drive device (1) includes a rotating shaft (25) having a lubricating oil passage (26) in which an opening (26a) for introducing lubricating oil is formed, a motor (3) having a rotor (5) that scoops up lubricating oil during rotation, And a case 2 containing these. The case 2 includes a boss 2Bb that rotatably supports the rotary shaft 25 via a ball bearing b1, and an opening that is opened so that the opening 26a is exposed. A portion 2Bd and a communication hole 2Ba through which the scraped lubricating oil is passed are formed. And the cover member 15 which seals the space S formed between the cases 2 is provided, and the lubricating oil that has passed through the communication hole 2Ba is passed through the opening 2Bd in the space S and the opening of the lubricating oil passage 26 The rib 15r as a guide member which guides to 26a, the rib 2Br, and the collection part 15a are provided.
[Selection] Figure 1

Description

  The present invention relates to a drive device mounted on, for example, a hybrid vehicle, an electric vehicle, and the like. Specifically, a lubricant oil scraped up by a rotor of a rotating electrical machine is applied to a lubricant oil passage formed in an axial direction on a rotating shaft. The present invention relates to a drive device that guides and supplies a lubrication site.

  In recent years, various vehicles equipped with motor generators (hereinafter simply referred to as “motors”) such as hybrid vehicles and electric vehicles have been proposed in order to improve vehicle fuel efficiency and environmental performance. In a vehicle equipped with a motor, it is arranged in the wheel of the wheel in order to secure the interior space, improve the drive / regeneration efficiency, or reduce the weight by omitting the axle shaft and differential device. Development of a so-called in-wheel motor drive device is being promoted.

  By the way, in the in-wheel motor driving apparatus as described above, if an oil pump is provided to generate lubricating oil pressure and supply the lubricating oil to a lubricating part that needs to be lubricated and cooled, the entire apparatus is large. Is not preferable from the viewpoint of disposing in a wheel of a wheel.

  For this reason, the lubricating oil in the case is scraped upward by the rotor of the motor, and the scraped lubricating oil is guided to, for example, a lubricating oil path formed in the rotating shaft at the center of the in-wheel motor drive device. A configuration is made such that the lubricating oil is supplied to a necessary portion by being scattered by centrifugal force (see Patent Literature 1 and Patent Literature 2).

JP 2001-173762 A JP 2010-124619 A

  By the way, the thing of patent document 1 forms the opening (41a) (namely, notch) in the boss | hub (41) which supports a rotating shaft, and lubricates the lubricating oil scraped up with the rotor of the motor by this opening (41a). The oil is collected and guided to the open portion (introduction portion) of the lubricating oil passage of the rotating shaft. However, in this patent document 1, since the notch is formed in the boss, there is a possibility that the strength of the boss may be weakened. To maintain the strength of the boss, it is necessary to increase the thickness of the boss. There is a problem that hinders the transformation.

  Therefore, as in Patent Document 2, the cover is attached to the case, and the lubricating oil scraped up by the rotor of the motor is guided to the space between the case and the cover so as to bypass the boss supporting the rotating shaft, A configuration has been proposed in which the lubricating oil accumulated in the space is introduced into the lubricating oil passage of the rotary shaft.

  However, in Patent Document 2, the lubricating oil is stored in the space between the case and the cover so that the lubricating oil is supplied to the lubricating oil passage of the rotating shaft. When it is considered that the lack of lubrication does not occur in a state where the lubricating oil has accumulated in the space between the two, it is necessary to increase the amount of lubricating oil enclosed in the case, for example, at the start of running after a long-term stop ( There is a problem that the agitation loss becomes large in a state where no lubricating oil is accumulated in the space, and an increase in the weight of the entire in-wheel motor drive device.

  Therefore, an object of the present invention is to provide a drive device that does not require a notch in a boss portion and can reduce the amount of lubricating oil sealed in a case member.

The drive device (1) according to the present invention (see, for example, FIGS. 1 to 3) supplies the lubricating oil formed and introduced in the axial direction to the lubricating portion, and at least one of the lubricating oil is opened to supply the lubricating oil. A rotating shaft (25) having a lubricating oil passage (26) formed with an introduction portion (26a) to be introduced;
A rotating electrical machine (3) disposed on the outer peripheral side of the rotating shaft (25) and having a rotor (5) that scoops up lubricating oil during rotation;
A boss portion (2Bb) that rotatably supports the rotating shaft (25) via a bearing (b1), and an inner peripheral side of the boss portion (2Bb) so that the introduction portion (26a) is exposed. An opening (2Bd) that is opened, and a communication hole (2Ba) that allows the lubricating oil scraped up by the rotor (5) to pass through. The rotating shaft (25) and the rotating electrical machine (3) An enclosing case member (2);
A cover member (15) for forming a space (S) for communicating the opening (2Bd) and the communication hole (2Ba) with the case member (2) and sealing the space (S). And comprising
At least one of the case member (2) and the cover member (15) introduces the lubricating oil that has passed through the communication hole (2Ba) into the space (S) through the opening (2Bd). It has a guide member (15r, 2Br, 15a) which leads to a portion (26a).

  In the driving device (1) according to the present invention (see, for example, FIGS. 1 and 2), the case member (2) communicates the lower portion of the space (S) with the inside of the case member (2). And a discharge hole (2Bc) for discharging the lubricating oil in the space (S) into the case member (2).

Furthermore, the drive device (1) according to the present invention (see, for example, FIGS. 1 and 2), the rotor (5) is disposed on the outer periphery of the boss portion (2Bb),
A resolver (30) having a stator (32) disposed on the outer peripheral side of the boss portion (2Bb) and a rotor (31) disposed on the inner peripheral side of the rotor (5);
The case member (2) has an adjustment hole (2Be) that allows the space (S) and the stator (32) to communicate with each other and allows the position of the stator (32) to be adjusted. .

In the driving device (1) according to the present invention (see, for example, FIGS. 1 and 2), the case member (2) has a recess (2BX) that is recessed in the axial direction with the opening (2Bd) as a bottom (2BXa). )
The boss portion (2Bb) is provided at the bottom (2BXa) of the recess (2BX),
The communication hole (2Ba) is provided so as to penetrate an upper part of the recess (2BX).

The drive device (1) according to the present invention (see, for example, FIG. 1) includes a fin (6a) that extends in the axial direction from the rotor (5) and is fixed to the rotor (5) to scoop up lubricating oil. ,
The communication hole (2Ba) is arranged on the inner peripheral side of the fin (6a).

  In the driving device (1) according to the present invention (see, for example, FIGS. 1 and 2), the guide member is formed on the cover member (15) and captures lubricating oil that has passed through the communication hole (2Ba). The discharging part (15b) for collecting and discharging the collected lubricating oil has a collecting part (15a) disposed close to the introduction part (26a) of the rotating shaft (25).

  In the driving device (1) according to the present invention (see, for example, FIGS. 1 to 3), the guide member is formed on the cover member (15), and the communication hole (2Ba) and the collecting portion ( The first rib (15r) formed so as to surround the path communicating with 15a) and the shape formed on the case member (2) and opposed to the first rib (15r). A second rib (2Br), and the first rib (15r) and the second rib (2Br) collect lubricating oil that has passed through the communication hole (2Ba) in the collecting portion (15a). It is characterized by guiding.

  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 guide that guides the lubricating oil having passed through the communication hole to at least one of the case member and the cover member through the opening to the introduction portion of the lubricating oil passage of the rotating shaft in the space. Since it has a member, the lubricating oil pumped up by the rotor is communicated without forming a notch in the boss part and without accumulating the lubricating oil in the space formed between the case member and the cover member. It can be introduced from the hole to the lubricating oil passage of the rotating shaft through the guide member. Thus, while the size of the boss portion can be reduced without increasing the thickness, the amount of lubricating oil can be reduced to reduce the stirring loss and the weight increase.

  According to the second aspect of the present invention, the case member communicates the lower portion of the space with the inside of the case member and has a discharge hole for discharging the lubricating oil in the space to the inside of the case member. Therefore, it is possible to prevent the lubricating oil from accumulating in the space formed between the case member and the cover member, to reduce the amount of lubricating oil, and to reduce the stirring loss and the weight increase. it can.

  According to the third aspect of the present invention, since the lubricant is prevented from collecting in the space formed between the case member and the cover member, the case member is provided with the space and the resolver stator. It is possible to provide an adjustment hole that allows communication and adjustment of the position of the stator. Further, the cover member can be provided with a function as a cover for closing the adjustment hole of the resolver and a function as a guide member for guiding the lubricating oil, and the member for closing the adjustment hole and the guide member are separately provided. Compared to the configuration, the number of parts can be reduced and the cost can be reduced.

  According to the fourth aspect of the present invention, the case member has the recess recessed in the axial direction with the opening as the bottom, the boss is provided at the bottom of the recess, and the communication hole passes through the upper portion of the recess. Since it is provided, that is, the space between the case member and the cover member can be arranged without expanding to the outside of the case member, and the entire apparatus can be made compact.

  According to the present invention of claim 5, since the communication hole is disposed on the inner peripheral side of the fin fixed to the rotor, the lubricating oil scraped up by the fin can be efficiently guided to the communication hole, A lot of lubricating oil can be introduced into the lubricating oil passage of the rotating shaft.

  According to the present invention of claim 6, the guide member is formed on the cover member and collects the lubricating oil that has passed through the communication hole, and the discharge portion that discharges the collected lubricating oil serves as the introduction portion of the rotating shaft. Since it has a collection part arranged in close proximity, the lubricating oil that has passed through the communication hole can be efficiently collected in the collection part and discharged toward the introduction part of the lubricating oil passage of the rotating shaft. Therefore, most of the lubricating oil that has passed through the communication hole can be introduced into the lubricating oil passage of the rotating shaft, and it is possible to prevent the lubricating oil from accumulating in the space formed between the case member and the cover member. it can.

  According to the seventh aspect of the present invention, the first rib formed on the cover member and the second rib formed on the case member collect and guide the lubricating oil that has passed through the communication hole to the collecting portion. Most of the lubricating oil that has passed through can be introduced into the lubricating oil passage of the rotating shaft, and it is possible to prevent the lubricating oil from accumulating in the space formed between the case member and the cover member.

Sectional drawing which shows the in-wheel motor drive device which concerns on this Embodiment. It is a front view which shows the recessed part of a case member, (a) is a figure which shows the recessed part before assembly | attachment, such as a connector, (b) is a figure which shows the recessed part after assembly | attachment, such as a connector. The rear view which shows a cover member.

  Hereinafter, the structure of an in-wheel motor drive device (drive device) according to an embodiment of the present invention will be described with reference to FIG. The in-wheel motor drive device 1 in the present embodiment is attached to the inside of a vehicle wheel (tire), and is used as, for example, a drive device for an electric vehicle wheel, a drive device for a hybrid vehicle wheel, or the like. Can do.

  As shown in FIG. 1, the in-wheel motor drive device 1 includes a case (case member) 2 in which a motor / generator (rotary electric machine) 3, a rotating shaft 25, a reduction planetary gear 40, and a wheel hub 51 are fixed. The output shaft 50 and the like are included. The output shaft 50, the reduction planetary gear 40, the rotating shaft 25, and the motor / generator 3 (hereinafter simply referred to as “motor 3”) are arranged coaxially with the center of a wheel (not shown).

  The case 2 includes a main case 2A that is open on the opposite side in the axial direction with respect to the bearing support portion 2Aa, and a case cover 2B that closes the opening of the main case 2A. The main case 2 </ b> A accommodates most of the main parts, and more specifically, a bearing support portion that extends to the opposite side of the reduction planetary gear 40 in the axial direction from a hub bearing (bearing) 52 to be described later and supports the hub bearing 52. 2Aa and a restricting portion 2Ab that protrudes to the inner diameter side from the fitting surface 2As of the outer race 52a of the hub bearing 52 and the case 2 and restricts the hub bearing 52 to the side opposite to the axial reduction planetary gear 40. It is configured. The main case 2A and the case cover 2B are fastened by bolts 11.

  Further, the case 2 has a sealed structure in which oil is sealed by sealing an outer peripheral side of a wheel hub 51 described later in detail and an inner peripheral side of the tip end of the bearing support portion 2Aa with a seal ring (seal member) 55. It is composed. The restricting portion 2Ab does not have to be a protrusion formed on the case 2, and may be, for example, a snap ring.

  The motor 3 disposed in the main case 2A is disposed on the outer peripheral side of the rotating shaft 25, and is fixed on the stator 4 fixed to the main case 2A and the rotor hub 7 supported by the rotating shaft 25. The rotor 5 is composed of a so-called IPM motor in which a permanent magnet is embedded. The stator 4 is configured by laminating a large number of steel plates, and has a stator steel plate 4 a in which the stator winding is embedded. The stator steel plate 4 a is fastened to the case 2 by bolts 12. Further, the stator 4 has coil ends 4b and 4b formed on both sides in the axial direction of the stator steel plate 4a so as to protrude from the stator steel plate 4a in order to fold the stator winding.

  On the other hand, 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 and embedded with, for example, permanent magnets. Both sides of the rotor core 5 a in the axial direction are crimped to the rotor hub 7 via the end plates 6, 6, that is, the rotor 5 rotates integrally with the rotor hub 7. Note that a blade-like fin 6a extends from the end plate 6 fixed to the rotor 5 on the case cover 2B side to the side of the coil end 4b. The oil accumulated in the lower part is scraped up, and oil is also applied to the upper part of the motor 3 to cool the motor 3 as a whole, and the lubricating oil is introduced into the communication hole 2Ba of the case cover 2B described later in detail.

  A resolver 30 is disposed on the inner peripheral side of the case cover 2B in the axial direction of the rotor hub 7. The resolver 30 includes a resolver rotor (rotor) 31 fixed to the rotor hub 7 and a resolver stator (stator) 32 fixed to the case cover 2B. The resolver stator 32 includes a plurality of resolver stators 32. These bolts 33 (see FIG. 2B) are fixed to the case cover 2B.

  The resolver 30 configured as described above detects the rotational position (phase) of the rotor 5, and the detection of the rotational position is used for motor control. In addition, since the resolver 30 can detect the rotation speed of the motor 3, it can also detect the rotation speed of the wheel 200 by multiplying the reduction ratio of the below-described reduction planetary gear 40.

  In the case cover 2B, the part of the resolver 30 to which the resolver stator 32 is fixed is formed as an annular boss 2Bb that rotatably supports the rotary shaft 25 via a ball bearing (bearing) b1. . The inner peripheral side of the boss portion 2Bb is extended so as to support the thrust direction of the ball bearing b1, and the end portion on the inner peripheral side is an opening 2Bd. It is comprised so that an edge part may be exposed.

  The rotary shaft 25 is disposed in the axial direction on the centers of a speed reduction planetary gear 40 and a motor 3 to be described later in detail, and one end of the rotary shaft 25 is rotatably supported by the ball bearing b1 with respect to the case cover 2B. At the same time, the other end is supported by the ball bearing b2 so as to be rotatable with respect to the case 2 via an output shaft 50 and a hub bearing 52, which will be described in detail later. The rotary shaft 25 is formed with a joint portion 25a to which the rotor hub 7 is joined at an outer peripheral portion on one end side, and a sun gear 41 constituting the speed reduction planetary gear 40 is formed on the outer peripheral portion on the other end side.

  A lubricating oil passage 26 having an opening portion (introduction portion) 26a and an opening portion 26b that are formed in the axial direction and open at both ends is formed in the central portion of the rotating shaft 25. As will be described in detail later, the lubricating oil passage 26 introduces lubricating oil from the opening 26a and discharges the lubricating oil from the opening 26b on the opposite side to lubricate the ball bearing b2. The lubricating oil passage 26 has an oil passage 26 c formed radially toward the inner peripheral side of the reduction planetary gear 40, and a part of the lubricating oil introduced from the opening 26 a is transferred to the reduction planetary gear 40. Then, the reduction planetary gear 40 is lubricated.

  The reduction planetary gear 40 includes the stepped pinion 44 having the sun gear 41, a large diameter pinion 44b meshing with the sun gear 41, and a small diameter pinion 44a formed smaller in diameter than the large diameter pinion 44b, and the stepped pinion 44. A carrier 42 that is rotatably supported and a ring gear 45 that meshes with the small-diameter pinion 44a are configured. The carrier 42 includes a flange portion 50d of the output shaft 50, a side plate 42a, and a bridge 42b that extends from the side plate 42a to the flange portion 50d. The stepped pinion 44 is connected to the side plate 42a. And a pinion shaft 43 spanned between the flange portion 50d and the pinion shaft 43. The pinion shaft 43 is rotatably connected to the output shaft 50 via the flange portion 50d.

  The stepped pinion 44 has a large-diameter pinion 44b arranged on the output shaft 50 side in the axial direction and a small-diameter pinion 44a arranged side by side in the axial direction on the motor 3 side in the axial direction. Accordingly, as the outer shape of the reduction planetary gear 40, the small-diameter pinion 44a side in the axial direction has a small stepped shape, and the rotor 5 of the motor 3 is arranged on the small-diameter pinion 44a side with respect to the large-diameter pinion 44b in the axial direction. The rotor 5 is arranged so that a part of the rotor 5 of the motor 3 overlaps the outer peripheral side of the small-diameter outer diameter portion in the step shape, that is, the outer-diameter side of the small-diameter pinion 44a when viewed from the radial direction. Yes.

  Between the radial direction of the small-diameter pinion 44a and the rotor 5 of the motor 3, a gear portion 45a of a ring gear 45 having a tooth surface formed on the inner peripheral side is disposed. The ring gear 45 includes, as an extending portion extending from the end portion on the large-diameter pinion 44b side in the axial direction of the gear portion 45a to the outer peripheral side of the large-diameter pinion 44b as a flange portion 45b and A drum portion 45c is provided, and a spline portion 45s is formed on the outer peripheral side of the drum portion 45c.

  The flange portion 45b of the ring gear 45 is between the side surface of the large-diameter pinion 44b and the side surface of the rotor 5 of the motor 3, and is flanged from the end portion of the gear portion 45a on the large-diameter pinion 44b side toward the outer peripheral side. It is formed to stand up in a shape. The drum portion 45c of the ring gear 45 is between the outer peripheral surface of the large-diameter pinion 44b and the coil end 4b on the wheel side in the axial direction of the stator 4 and extends axially from the outer peripheral end of the flange portion 45b. It is formed to extend in a drum shape toward the wheel side.

  That is, the ring gear 45 has a gear part 45a, a flange part 45b as an extension part, and a drum part 45c arranged along the outer shape of the stepped pinion 44 that is a stepped outer shape, and has a stepped inner shape. Arranged along the inner side of the rotor 5 and the coil end 4b of the motor 3, that is, the stepped pinion 44, the ring gear 45, and the motor 3 are arranged close to each other without forming a useless space.

  As described above, the spline portion 45s is formed on the outer peripheral side of the drum portion 45c of the ring gear 45. The spline portion 45s is arranged at a position overlapping the large-diameter pinion 44b when viewed from the radial direction, and connected to the spline portion 45s. The spline portion 60s of the member 60 is spline-coupled to be driven and connected in the rotational direction, and is fixed in the axial direction by the snap ring 61. That is, the ring gear 45 and the connecting member 60 are fixed substantially integrally.

  The connecting member 60 roughly includes a flange-shaped flange portion 60a extending in the radial direction, and a drum portion 60b extending from the outer peripheral side of the flange portion 60a to the motor 3 side in the axial direction. A spline portion 60s that is spline-coupled to the ring gear 45 is formed at the tip of the drum portion 60b. One flange portion 60 a extends to the inner peripheral side in close contact with the inner surface of the main case 2 </ b> A, and is fixed to the case 2 by a plurality of bolts 65. That is, the connecting member 60 is connected and fixed to the case 2, and the ring gear 45 is fixed to the case 2 so as not to rotate via the spline portions 60s and 45s.

  Further, a retaining portion 60d is formed at the inner diameter side end portion of the flange portion 60a of the connecting member 60. The retaining portion 60d is axially disposed on the side surface of the outer race 52a of the hub bearing 52 described later. The hub bearing 52 is abutted from the reduction planetary gear 40 side and fitted to the outer peripheral end portion, and the hub bearing 52 is prevented from coming off from the axial reduction planetary gear 40 side with respect to the bearing support portion 2Aa of the main case 2A.

  On the other hand, as described above, the output shaft 50 is formed with a flange-shaped flange portion 50d that forms a part of the carrier 42 at the end portion on the reduction planetary gear 40 side in the axial direction. The opposite side to the speed reduction planetary gear 40 is formed as a large diameter portion 50c having a large diameter, the intermediate portion is formed as a small diameter portion 50b having a smaller diameter than the large diameter portion 50c, and further, the tip portion has a smaller diameter than the small diameter portion 50b. A leading end 50a is formed. The output shaft 50 outputs the rotation of the speed reduction planetary gear 40 from the carrier 42 through the flange portion 50d.

  A spline portion 50 s is formed on the outer peripheral surface of the small diameter portion 50 b of the output shaft 50, and the spline portion 51 s formed on the inner peripheral surface of the wheel hub 51 is spline-fitted to the spline portion 50 s. . The wheel hub 51 is fixed and secured by a nut 53 being screwed onto the tip 50a of the output shaft 50.

  On the outer peripheral side of the hollow sleeve portion 51a of the wheel hub 51, there are an outer race 52a, an inner race 52b, and a plurality of intervening spaces between the outer race 52a and the inner race 52b between the bearing support portion 2Aa of the main case 2A. A hub bearing 52 having a ball 52c is fitted, and the hub bearing 52 supports the output shaft 50 and the wheel hub 51 so as to be rotatable with respect to the case 2. Note that a wheel, a brake disk, etc., not shown, are fastened to the hub portion 51b of the wheel hub 51 with bolts or the like.

  A seal ring 55 is disposed between the outer peripheral surface of the sleeve portion 51a of the wheel hub 51 and the inner peripheral surface of the tip end of the bearing support portion 2Aa of the main case 2A. In addition, foreign matter intrusion from the outside is prevented.

  Next, a portion of the space S formed by the recess 2BX of the case cover 2B of the case 2 and the cover member 15 will be described with reference to FIGS.

  As shown in FIG. 1, the case cover 2B is formed with a recess 2BX that is recessed with the boss 2Bb and the opening 2Bd as the bottom 2BXa on the opposite side of the output shaft 50 in the axial direction. In the recess 2BX, when the cover member 15 is fixed by the snap ring 18, the space S formed between the cover member 15 and the cover member 15 is closed, and the space S is sealed by the seal ring 19. . The space S is a space that communicates a communication hole 2Ba, which will be described later, and an opening 2Bd of the case cover 2B.

  As shown in FIGS. 1 and 2A, a communication hole 2Ba is formed in the upper portion of the recess 2BX of the case cover 2B through which the lubricating oil scraped up by the fin 6a fixed to the rotor 5 is passed. Yes. The lower portion of the recess 2BX of the case cover 2B is formed with a discharge hole 2Bc that communicates the lower portion of the space S with the inside of the case 2 and discharges the lubricating oil in the space S to the inside of the case 2. Yes.

  Further, as shown in FIG. 2A, a through hole 2Bf for passing a wire connecting the resolver 30 and a control unit (not shown) is detected in the side portion of the recess 2BX, and the temperature of the motor 3 is detected. A through hole 2 </ b> Bg for passing a wiring connecting a temperature sensor (not shown) and a control unit (not shown) is formed. Further, an adjustment hole 2Be for adjusting the position of the resolver stator 32 with respect to the resolver rotor 31 is formed in the bottom 2BXa of the recess 2BX.

  That is, as shown in FIG. 2B, the adjustment hole 2Be is exposed before the cover member 15 (see FIG. 1) is attached to the case cover 2B, and the resolver is passed through the adjustment hole 2Be. Position adjustment of the stator 32 with respect to the resolver rotor 31 can be performed.

  Further, the wiring connected to the resolver stator 32 is connected to the connector 71, while the wiring connected to the control unit (not shown) passes through the through hole 2Bf formed in the case cover 2B and is connected to the connector 71. Connected to. As a result, the rotational position of the rotor 5 detected by the resolver 30 is transmitted to a control unit (not shown) and used for controlling the rotation of the motor 3.

  Further, the wiring connected to the temperature sensor (not shown) is connected to the connector 72, while the wiring connected to the control unit (not shown) passes through the through hole 2Bg formed in the case cover 2B. Connected to the connector 72. Thereby, the temperature of the motor 3 detected by a temperature sensor (not shown) is transmitted to a control unit (not shown) and used for driving control of the motor 3.

  As described above, the cover member 15 is assembled in the recess 2BX of the case cover 2B after adjusting the resolver 30 and connecting the connectors 71 and 72 necessary as a manufacturing process of the in-wheel motor drive device 1. The space S that is fixed and accommodates the connectors 71 and 72 and the like is sealed.

  As shown in FIGS. 1 and 3, the cover member 15 is formed in a semi-cylindrical shape substantially at the center, and extends to the opening 2 </ b> Bd of the case cover 2 </ b> B and extends to the lubricating oil passage of the rotary shaft 25. The collection part 15a which adjoins and opposes the opening part 26a of 26 is formed. That is, the collecting portion 15a collects the lubricating oil introduced from the communication hole 2Ba into the inner groove 15b serving as a lubricating oil discharge portion, and introduces the lubricating oil into the opening portion 26a of the lubricating oil passage 26.

  Further, the cover member 15 has a rib (guide member, first rib) formed substantially in a V shape so as to surround a path that connects the communication hole 2Ba of the case cover 2B and the collecting portion 15a. ) 15r is formed. On the other hand, as shown in FIGS. 2 (a) and 2 (b), the bottom 2BXa of the recess 2BX of the case cover 2B is also formed so as to be opposed to the rib 15r, and the upper side is substantially V-shaped. And the rib (guide member, 2nd rib) 2Br formed in the cylindrical shape so that the lower side may surround the said collection part 15a is formed.

  Therefore, as shown in FIG. 1, when the cover member 15 is attached and fixed to the recess 2BX of the case cover 2B, the rib 15r of the cover member 15 and the rib 2Br of the case cover 2B pass through the communication hole 2Ba. A path for collecting and guiding the lubricating oil to the collecting portion 15a is configured. As shown in FIG. 3, the cover member 15 has a recess 15 c for accommodating the connector 71 at a position corresponding to the connector 71.

  In the in-wheel motor drive device 1 configured as described above, for example, when a control unit (not shown) starts the power running control of the motor 3 based on the accelerator operation of the driver, the power source (battery), the inverter circuit, etc. Electric power is supplied to the stator 4 of the motor 3 and the rotor 5 is rotationally driven. Then, the output rotation of the motor 3 is transmitted to the rotating shaft 25 via the rotor hub 7 and the sun gear 41 is driven to rotate, so that the carrier 42 is decelerated and rotated through the ring gear 45 whose rotation is fixed in the reduction planetary gear 40. (That is, the output rotation of the motor 3 is shifted to a decelerated rotation), and the decelerated rotation of the carrier 42 is transmitted to the output shaft 50 and the wheel hub 51 as the driving force of the decelerated motor 3, and the wheels are rotated as the driving rotation. It will be rotationally driven.

  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 41 of the rotary shaft 25 is rotated at an increased speed through the ring gear 45 whose rotation is fixed, and the rotor 5 is rotationally driven through the rotor hub 7 so that the stator 4 is negatively charged. Thus, the rotation of the rotor 5 causes a counter electromotive force to act on the stator 4, and the power is supplied to the power source via the inverter circuit or the like, so that the power source is charged.

  Thus, when the rotor 5 of the motor 3 is rotated, the lubricating oil accumulated below the case 2 is scraped upward by the fins 6a extending from the end plate 6 described above. The scraped lubricating oil passes through the communication hole 2Ba formed in the upper portion of the recess 2BX of the case cover 2B, and is substantially V-shaped formed by the rib 15r of the cover member 15 and the rib 2Br of the case cover 2B. And is collected by the collection part 15a. The lubricating oil flowing along the groove 15b of the collecting portion 15a is guided to the opening 26a of the lubricating oil passage 26 of the rotating shaft 25 through the opening 2Bd of the case cover 2B, and the inside of the lubricating oil passage 26 Introduced into the shed.

  A part of the lubricating oil introduced into the lubricating oil passage 26 is scattered from the oil passage 26c to the outer peripheral side, lubricates the speed reduction planetary gear 40 as a lubricating portion, and then cools the coil end 4b and the like below the case 2 Returned to oil sump. Further, most of the lubricating oil introduced into the lubricating oil passage 26 is discharged from the opening 26b on the opposite side in the axial direction, lubricates the ball bearing b2 as a lubricating portion, and then lubricates the speed reduction planetary gear 40. Then, after being guided to the outer periphery of the connecting member 60, the hub bearing 52 as a lubrication part is lubricated through an oil passage (not shown) and returned to the oil reservoir below the case 2.

  In the space S, the lubricating oil leaked from the gap between the rib 15r of the cover member 15 and the rib 2Br of the case cover 2B, or the lubricating oil leaked without being introduced into the lubricating oil passage 26 from the collecting portion 15a Although it flows below S, it returns to the inside of the case 2 from the discharge hole 2Bc and returns to the oil reservoir below. Therefore, the space S is basically a space filled with air without being filled with lubricating oil.

  As described above, according to the in-wheel motor drive device 1, the lubricating oil that has passed through the communication hole 2 </ b> Ba is passed through at least one of the case 2 and the cover member 15 in the space S via the opening 2 </ b> Bd. Since the rib 15r of the cover member 15, the rib 2Br of the case cover 2B, and the collecting portion 15a (that is, the guide member) leading to the opening 26a of the 25 lubricating oil passage 26 are provided, the boss portion 2Bb is notched. Without forming the lubricant oil in the space S formed between the case 2 and the cover member 15, the lubricant oil scooped up by the rotor 5 is connected to the ribs 15 r of the cover member 15 from the communication hole 2Ba. It can be introduced to the lubricating oil passage 26 of the rotating shaft 25 through the rib 2Br of the case cover 2B and the collecting portion 15a. As a result, it is possible to reduce the size of the boss 2Bb without increasing the thickness of the boss portion 2Bb. However, the amount of lubricating oil accumulated in the space S can be eliminated, the amount of lubricating oil can be reduced as a whole, the stirring loss can be reduced, and the weight can be reduced. The increase can be reduced.

  Further, the case 2 has a discharge hole 2Bc that communicates the lower portion of the space S with the inside of the case 2 and discharges the lubricating oil in the space S to the inside of the case 2. Lubricating oil can be prevented from accumulating in the space S formed between the cover member 15 and the amount of lubricating oil can be reduced to reduce stirring loss and increase in weight.

  Further, since the lubricant is prevented from collecting in the space S formed between the case 2 and the cover member 15, the space S and the resolver stator 32 of the resolver 30 are communicated with the case 2, An adjustment hole 2Be that enables the position adjustment of the resolver stator 32 can be provided. Further, the cover member 15 can be provided with a function as a cover for closing the adjustment hole 2Be of the resolver 30 and a function as a guide member for guiding the lubricating oil, and a member and a guide member for closing the adjustment hole 2Be. As compared with the case where these are configured separately, the number of parts can be reduced and the cost can be reduced.

  Further, the case 2 has a recess 2BX that is recessed in the axial direction with the opening 2Bd as the bottom 2BXa, the boss 2Bb is provided in the bottom 2BXa of the recess 2BX, and the communication hole 2Ba passes through the upper part of the recess 2BX. Since it is provided, that is, the space S between the case 2 and the cover member 15 can be arranged without expanding to the outside of the case 2, the entire in-wheel motor drive device 1 can be made compact.

  Further, since the communication hole 2Ba is arranged on the inner peripheral side of the fin 6a fixed to the rotor 5, the lubricating oil scraped up by the fin 6a can be efficiently guided to the communication hole 2Ba, and the rotary shaft 25 A large amount of lubricating oil can be introduced into the lubricating oil passage 26.

  Further, a collecting portion 15a formed in the cover member 15 and collecting the lubricating oil passing through the communication hole 2Ba and having a groove 15b for discharging the collected lubricating oil disposed close to the opening portion 26a of the rotating shaft 25. Therefore, the lubricating oil that has passed through the communication hole 2Ba can be efficiently collected in the collecting portion 15a and discharged toward the opening 26a of the lubricating oil passage 26 of the rotary shaft 25. Most of the lubricating oil that has passed through the hole 2Ba can be introduced into the lubricating oil passage 26 of the rotary shaft 25, so that the lubricating oil can be prevented from collecting in the space S formed between the case 2 and the cover member 15. You can plan.

  Further, the lubricating oil passing through the communication hole 2Ba is collected and guided to the collecting portion 15a by the rib 15Br formed on the cover member 15 and the rib 2Br formed on the case cover 2B. Most of the oil can be introduced into the lubricating oil passage 26 of the rotary shaft 25, and it is possible to prevent the lubricating oil from accumulating in the space S formed between the case 2 and the cover member 15.

  In the present embodiment described above, the reduction planetary gear has been described that decelerates the rotation of the motor 3 and outputs it to the output shaft 50. However, for example, the carrier is drivingly connected to the rotation shaft 25 and the sun gear is connected to the output shaft. The present invention can also be applied to a planetary gear device that accelerates the rotation of the motor 3 by being connected to the motor 50.

  In the present embodiment described above, the motor 3 is configured as an IPM motor. However, the present invention is not limited to this, and an SPM motor or a reluctance motor may be used. It may be a motor of a kind.

  Further, the in-wheel motor drive device 1 according to the present embodiment is basically mounted on the left wheel with respect to the traveling direction of the vehicle, but of course should be mounted on the left and right wheels respectively. The in-wheel motor drive device 1 mounted on the wheel of FIG. 1 is reversed in the left-right direction (the shape shown on the mirror surface) in FIG.

  Moreover, in this Embodiment demonstrated above, although the in-wheel motor drive device attached to the inner side of the wheel of a wheel was demonstrated as an example as a drive device, the hybrid drive device for hybrid vehicles, or the electric drive for electric vehicles The present invention can be applied to any driving device provided that the driving device includes a rotating electrical machine that scoops up the lubricating oil and a rotating shaft that introduces the scraped lubricating oil.

1 Drive device (In-wheel motor drive device)
2 Case member (case)
2Ba Communication hole 2Bb Boss part 2Bc Discharge hole 2Bd Opening part 2Be Adjustment hole 2Br Guide member, 2nd rib (rib)
2BX Recess 2BXa Bottom 3 Rotating electrical machine (motor)
5 Rotor 6a Fin 15 Cover member 15a Guide member, collection part 15b Discharge part (groove)
15r guide member, first rib (rib)
25 Rotating shaft 26 Lubricating oil passage 26a Introduction part (opening part)
30 Resolver 31 Rotor (Resolver rotor)
32 Stator (Resolver stator)
b1 Bearing (ball bearing)
S space

Claims (7)

A rotating shaft having a lubricating oil passage in which an introduction portion for introducing lubricating oil is formed by opening at least one of the lubricating oil and supplying the lubricating oil formed and introduced toward the axial direction to the lubricating portion;
A rotating electrical machine having a rotor disposed on the outer peripheral side of the rotating shaft and scooping up lubricating oil during rotation;
A boss portion that rotatably supports the rotating shaft via a bearing, an opening portion that is open on the inner peripheral side of the boss portion so that the introduction portion is exposed, and lubrication that is scraped up by the rotor A communication hole through which oil passes, and a case member containing the rotating shaft and the rotating electrical machine,
A space for communicating the opening and the communication hole between the case member and a cover member for sealing the space;
At least one of the case member and the cover member has a guide member that guides the lubricating oil that has passed through the communication hole to the introduction portion through the opening in the space.
A drive device characterized by that. The case member communicates with a lower portion of the space and the inside of the case member, and has a discharge hole for discharging lubricating oil in the space to the inside of the case member.
The drive device according to claim 1. The rotor is disposed on the outer periphery of the boss portion,
A resolver having a stator disposed on the outer peripheral side of the boss portion and a rotor disposed on the inner peripheral side of the rotor;
The case member communicates with the space and the stator, and has an adjustment hole that enables position adjustment of the stator.
The drive device according to claim 1, wherein The case member has a recess that is recessed in the axial direction with the opening as a bottom,
The boss is provided at the bottom of the recess,
The communication hole is provided so as to penetrate the upper part of the recess.
4. The drive device according to claim 1, wherein The axially extending from the rotor and fixed to the rotor, comprising a fin that scoops up lubricating oil,
The communication hole is disposed on the inner peripheral side of the fin,
The drive device according to claim 1, wherein the drive device is provided. The guide member is formed on the cover member, collects the lubricating oil that has passed through the communication hole, and a collecting portion that discharges the collected lubricating oil and is disposed close to the introduction portion of the rotating shaft. Having a part,
6. The drive device according to claim 1, wherein The guide member is formed in the cover member and is formed on the case member so as to surround a path that communicates the communication hole and the collecting portion, and the first rib. And a second rib formed in a shape oppositely disposed, and by the first rib and the second rib, the lubricating oil that has passed through the communication hole is collected and guided to the collecting portion.
The drive device according to claim 6.

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