JP2012214203A - In-wheel motor driving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an in-wheel motor driving device that enables highly accurate alignment between a central shaft of a wheel and an output shaft of the in-wheel motor driving device, thereby preventing vibration and noise while improving durability.SOLUTION: This in-wheel motor driving device 1 is installed inside a wheel 100 of a wheel 200 rotatably supported via a hub bearing 52 supported by a support part 95 of a suspension device 90, and drives the wheel 200 by a motor 3 stored in a case 2. In this case 2, a spigot fitting surface 2Ac arranged axially parallel to a centering surface 52Ab and to be fitted by a spigot, is formed in a fitting hole 95a of the support part 95 of the suspension device 90 to be fitted by the spigot to the centering surface 52Ab formed in a concentrically circular shape with the rotational center of the output shaft 50 and formed on an outer peripheral surface of a bearing case 52A of the hub bearing 52.

Description

  The present invention relates to an in-wheel motor drive device mounted on, for example, a hybrid vehicle, an electric vehicle, and the like. More specifically, the present invention relates to a wheel of a wheel that is rotatably supported via a hub bearing supported by a support portion of a suspension device. The present invention relates to an in-wheel motor drive device attached to the inside.

  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 an in-wheel motor drive device to be installed is underway (see Patent Document 1).

  In Patent Document 1, the hub bearing (11, 12) can be rotated by a knuckle (180) attached to the upper arm (210) and the lower arm (220) via a ball joint (160, 170). By supporting, the wheel (wheel) is supported with respect to the vehicle body, and the case of the in-wheel motor drive device (IWM) is supported via the damper (140, 150) with respect to the ball joint (160, 170). In this way, the in-wheel motor driving device is supported with respect to the vehicle body, that is, a structure in which the wheel and the in-wheel motor driving device are separately supported by the suspension device (wheel support device 200) is adopted. Yes.

JP 2005-126037 A

  In the above-mentioned Patent Document 1, since the in-wheel motor driving device and the wheel are separately supported, they are connected in a state where they can move relative to each other. In particular, the output shaft of the in-wheel motor driving device and the center of the wheel are connected. Since the relative angle with respect to the shaft can vary, it is necessary to provide a constant velocity joint between the output shaft of the in-wheel motor drive device and the wheel, and there are problems such as an increase in the number of parts and an obstacle to downsizing. In addition, since the suspension device separately supports not only the wheel but also the in-wheel motor drive device, there is a problem that the suspension device itself has an expensive and complicated structure.

  In order to solve such a problem, it is conceivable to fix the in-wheel motor drive device to the wheel supported by the suspension device. If there is no relative movement between the wheel and the in-wheel motor drive device, it is not necessary to provide a constant velocity joint or the like, and the suspension device only needs to support the wheel as before, so the in-wheel motor drive device The mounting of the in-wheel motor drive device can be easily achieved without significantly changing the design of the suspension device of the vehicle that does not have the vehicle mounted, and an increase in cost can be prevented.

  However, in the case where the in-wheel motor drive device is fixed so as not to be relatively movable with respect to the wheel as described above, if the accuracy of the alignment between the center axis of the wheel and the output shaft of the in-wheel motor drive device is low, a slight vibration will occur. May cause generation of noise and noise, or hinder the improvement of durability of the in-wheel motor drive device.

  Therefore, the present invention makes it possible to achieve high precision alignment of the center axis of the wheel and the output shaft of the in-wheel motor drive device, thereby preventing vibrations, preventing noise, and improving durability. An object of the present invention is to provide an in-wheel motor drive device.

The present invention (see, for example, FIGS. 1 to 4) is a wheel (100) of a wheel (200) rotatably supported via a hub bearing (52) supported by a support part (95) of a suspension device (90). In-wheel motor drive device (1) that can be driven inside the wheel (200) by the rotating electrical machine (3) housed in the case member (2),
The case member (2) is formed concentrically with the rotation center (AX1) of the output shaft (50) that outputs the driving force of the rotating electrical machine (3), and the outer peripheral member (52A) of the hub bearing (52). In the fitting hole (95a) of the support portion (95) of the suspension device (90) that fits into the centering surface (52Ab) formed on the outer peripheral surface of the shaft, the centering surface (52Ab) and the axial direction It has a spigot fitting surface (2Ac) which is juxtaposed and fits a spigot.

  In the present invention (see, for example, FIG. 1), the case member (2) is fixed to the support portion (95) of the suspension device (90) on the outer peripheral side of the spigot fitting surface (2Ac). Part (2Aa).

  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 inlay fitting surface of the case member of the in-wheel motor drive device is formed concentrically with the rotation center of the output shaft, and the inlay fitting is performed on the centering surface of the hub bearing. Because the centering surface and the output shaft of the in-wheel motor drive device are aligned with each other, the centering surface of the suspension device and the output shaft of the in-wheel motor drive device are highly aligned. Positioning can be performed with high accuracy, and vibrations can be prevented, noise can be prevented, and durability can be improved.

  In addition, the fitting hole of the support portion of the suspension device is configured to fit in-line with the centering surface of the hub bearing even in a vehicle not equipped with the in-wheel motor drive device. Since the case member of the in-wheel motor drive device can be fitted in-row using, the central axis of the wheel and the in-wheel motor drive device can be It is possible to position the shaft alignment with the output shaft with high accuracy.

  According to the second aspect of the present invention, since the case member has the fixed portion fixed to the support portion of the suspension device on the outer peripheral side of the spigot fitting surface, the in-wheel motor drive device is supported by the suspension device. Since the suspension device is not structured to support the wheel via the case member of the in-wheel motor drive device, the vehicle load is applied to the case member of the in-wheel motor drive device. For example, it is not necessary to increase the thickness of the case member to strengthen it, and the in-wheel motor drive device can be made compact and light.

Sectional drawing which shows the wheel provided with the in-wheel motor drive device. The side view which shows the wheel provided with the in-wheel motor drive device. The side view which shows the state which attached the wheel to the suspension apparatus. The upper view which shows the state which attached the wheel to the suspension apparatus.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments according to the present invention will be described below with reference to FIGS. First, an in-wheel motor drive device according to the present invention and a structure of a wheel including the same will be described with reference to FIGS. 1 and 2. The in-wheel motor drive device 1 according to the present embodiment is used as a drive device for mounting in a rear wheel of a front-wheel drive hybrid vehicle and changing to a four-wheel drive vehicle. In addition, for example, a drive device for an electric vehicle, a drive device for a series hybrid vehicle, a drive device for mounting in a front wheel in a rear wheel drive hybrid vehicle and changing to a four wheel drive vehicle, etc. it can.

  As shown in FIG. 1, the in-wheel motor drive device 1 includes a motor (generator) 3, a reduction gear mechanism 20, a reduction planetary gear 40, and a wheel hub 51. A fixed output shaft 50 and the like are accommodated. Of these, the output shaft 50 and the reduction planetary gear 40 are arranged on a first axis AX1 coaxial with the rotation center of the wheel 100, which will be described in detail later, and the reduction gear mechanism 20 has a transmission path extending in a direction perpendicular to the axial direction. Further, the motor / generator 3 (hereinafter simply referred to as “motor 3”) is disposed on the second axis AX2 parallel to the first axis AX1. Thereby, the transmission path formed by the motor 3, the reduction gear mechanism 20, the reduction planetary gear 40, and the output shaft 50 is configured to have a U shape in a cross-sectional view.

  In other words, the motor 3 and the reduction planetary gear 40 are arranged so as to be positioned on a radial cross section orthogonal to the first axis AX1 and the second axis AX2, that is, the motor 3 and the reduction planetary gear 40 pass through the first axis. There will be at least one radial cross section perpendicular to the first axis AX1 and the second axis AX2. In other words, at least a part of the motor 3 and at least a part of the speed reduction planetary gear 40 are arranged at positions that overlap in the axial direction when viewed from the radial direction, and preferably the entire speed reduction planetary gear 40 is formed as shown in FIG. It is good to arrange | position in the position which overlaps with the motor 3 at an axial direction seeing from radial direction.

  The case 2 includes a main case 2A that accommodates most of the main components, and that is open on the opposite side of the output shaft 50 in the axial direction, and a case cover 2B that closes the opening of the main case 2A. Has been. The main case 2A and the case cover 2B are fastened by a bolt 11 that is screwed into the hole 2Ah of the main case 2A and the hole 2Bh of the case cover 2B.

As shown in FIG. 2, the case 2 is roughly cylindrical with the first axis AX1 as the center, and houses a reduction gear shaft 25, a reduction planetary gear 40, and a part of the output shaft 50, which will be described later. The first cylindrical portion 2CY ₁ and the second cylindrical portion 2CY ₂ that has a cylindrical shape centered on the second axis AX2 and that houses the motor 3 can be viewed in a partially divided manner. The first cylindrical portion 2CY ₁ and the second cylindrical portion 2CY ₂ have a part of the outer wall overlapped to form a figure 8 in side view, and the portion where the outer wall overlaps is shown in FIG. As shown, a partition wall portion between the motor 3 and the output shaft 50 is formed.

As shown in FIG. 2, the first axis AX1, i.e. first central cylindrical portion 2CY ₁ of the case 2 is located on the center coaxial with the wheel 100, the second axis AX2, i.e. the second cylindrical portion of the case 2 2CY The center of ₂ is arranged above the first axis AX1 in the vehicle mounted state, that is, the motor 3 is arranged above the in-wheel motor drive device 1. Further, the second axis AX2 (second cylindrical portion of the case 2 2CY ₂₎ is in one circumferential direction (e.g. the vehicle traveling relative to the vertical line V perpendicular with the horizontal line H and the first axis AX1 through the first axis AX1 The caliper 72 of the disc brake device 70 is arranged on the other side in the circumferential direction with respect to the vertical line V (for example, the rear side in the vehicle traveling direction) as will be described in detail later. Has been. Therefore, the motor 3 is arranged at different positions in the circumferential direction around the first axis AX1 with respect to the caliper 72.

In addition, the case 2 forms a sealing structure in which oil is sealed by sealing an outer peripheral side of an output shaft 50 described later in detail with a seal ring 55. That is, the case 2 houses the motor 3, the reduction gear mechanism 20, the reduction planetary gear 40, a part of the output shaft 50, and the like, and encloses oil to form an oil reservoir on the lower side inside the case 2. Yes. The oil reservoir is formed in the lower part of the first cylindrical portion 2CY ₁ on the lower side than the first shaft AX1, and a part of a large-diameter gear 25a of the reduction planetary gear 40 and a reduction gear shaft 25 described later. So that the motor 3 is lubricated and cooled by the oil scraped up by the rotation of the speed reduction planetary gear 40 and the large diameter gear 25a without being immersed in the oil reservoir. Therefore, normally, the motor 3 is not immersed in the oil reservoir, and no oil stirring loss occurs in the motor 3.

  Next, the internal structure of the in-wheel motor drive device 1 will be described in detail with reference to FIG. In addition, sectional drawing of the in-wheel motor drive device 1 shown in FIG. 1 is AA arrow sectional drawing shown in FIG.

As described above, the motor 3 is disposed in the upper part of the main case 2A. The motor 3 includes a stator 4 that is fixed to the case 2 and a rotor 5 that is fixed on a rotor shaft 7 that is rotatably supported by the case 2 on the second axis AX2. The rotor 5 is composed of a so-called induction motor in which no permanent magnet is embedded. The stator 4 is configured by laminating a large number of steel plates, and has a stator steel plate 4a in which stator windings are embedded. The stator steel plate 4a is fastened to the case 2 by a bolt or the like with a fixed portion not shown. Has been. The wiring connected to the stator windings are connected to the inverter circuit (not shown) via a second cylindrical portion 2CY ₂ of the front side disposed in the connector portion of the side 15 (see FIG. 2).

  On the other hand, the rotor 5 has a cylindrical rotor core 5a configured such that steel plates are laminated in the same manner as the stator steel plate 4a and, for example, an induced current is generated. 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 has a so-called both-end supported structure by a ball bearing b1 fitted to the annular portion of the inner surface of the main case 2A and a ball bearing b2 fitted to the annular portion of the inner surface of the case cover 2B. It is supported so that it can rotate freely. A small-diameter gear 21 as a reduction gear mechanism 20 is spline-fitted to the rotor shaft 7 so as to be relatively non-rotatable on the rotor shaft 7 so as to be arranged in parallel with the rotor core 5a in the axial direction. At the same time, the small-diameter gear 21 is fastened to the stepped portion 7b of the rotor shaft 7 by the nut 9 together with the ball bearing b2.

  The reduction gear mechanism 20 includes the small-diameter gear 21 fixed to the rotor shaft 7, the idler gear 22 that meshes with the small-diameter gear 21, and the large-diameter gear 25 a of the reduction gear shaft 25 that meshes with the idler gear 22. It is configured. The idler gear 22 is disposed on a third axis AX3 parallel to the first axis AX1 and the second axis AX2, and is rotatably supported by the idler shaft 23 via a needle bearing b3. The idler shaft 23 is configured to have a so-called both-end support structure by a hole portion formed in the case cover 2B and a hole portion of the support plate 24 fixedly supported by the case cover 2B.

  The large-diameter gear 25a of the reduction gear shaft 25 is arranged in parallel on the first axis AX1 together with the reduction planetary gear 40 and the output shaft 50, and the outer peripheral surface of the portion formed in a flange shape from the reduction gear shaft 25 is the idler gear. By being formed as a tooth surface that meshes with 22, it is configured as a gear. The reduction gear shaft 25 on the first axis AX1 is on the axis parallel to and below the rotor shaft 7 on the second axis AX2, and one end thereof is rotatable with respect to the case 2 by the ball bearing b4. While being supported, the other end is rotatably supported by the ball bearing b5 with respect to the case 2 via an output shaft 50 and a hub bearing 52, which will be described in detail later. The large-diameter gear 25a transmits the rotation of the motor 3 through the idler gear 22 and the small-diameter gear 21. A tooth surface of the sun gear 25 b of the reduction planetary gear 40 is formed on the outer peripheral surface of the reduction gear shaft 25 on the output shaft 50 side in the axial direction.

  The reduction gear mechanism 20 has a straight line with the centers of the small-diameter gear 21, the idler gear 22, and the large-diameter gear 25a (that is, the axes of the first axis AX1, the second axis AX2, and the third axis AX3) in a side view. 1 and 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 in a straight line as shown in FIG. Has been.

The reduction planetary gear 40 includes the sun gear 25b described above, 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 flange of the side plate 42 and the output shaft 50. The pinion shaft 44 spanned around the portion 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. In the main case 2A, the ring gear 41 is spline-fitted to a cylindrical portion formed along the inner peripheral surface of the first cylindrical portion 2CY ₁ while being pinched between the main case 2A and a snap ring 45. It is fixed impossible.

  As described above, the output shaft 50 is formed with the 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 reduction planetary gear of the flange portion 50d. 40 is formed as a large-diameter portion 50c having a large diameter on the side opposite to the axial direction, an intermediate portion is formed as a small-diameter portion 50b having a smaller diameter than the large-diameter portion 50c, and a tip having a smaller diameter than the small-diameter portion 50b at the tip portion. A portion 50a is formed. The ball bearing b5 is inserted between the large-diameter portion 50c and the reduction gear shaft 25.

The outer peripheral surface of the large diameter portion 50c of the output shaft 50 are fitted into the sleeve 54, between and the sleeve 54 the inner circumferential surface of the first cylindrical portion 2CY _1, the seal ring 55 is disposed The sealing of the oil reservoir is ensured and the intrusion of relics from outside is attempted. Further, a tooth surface 54a is formed on the outer peripheral surface of the sleeve 54 in the axial direction on the speed reduction planetary gear 40 side, and a rotation speed sensor 59 that detects the passage of teeth on the tooth surface 54a facing the tooth surface 54a. Is arranged. Since the rotation speed sensor 59 detects the rotation of the wheel 100 to which the brake disk 71 of the disk brake device 70 is fixed via the output shaft 50, the rotation speed sensor 59 can be used as a speed sensor, an ABS rotation speed sensor, or the like. it can. Further, the wiring of the rotation speed sensor 59 is connected to a control unit (not shown) via a connector terminal portion 16 (see FIG. 2) provided on the side surface of the first cylindrical portion 2CY _{1 on} the case cover 2B side.

  On the other hand, the wheel hub 51 is spline-fitted to the outer peripheral surface of the small-diameter portion 50b of the output shaft 50, and the base portion 50e on the reduction planetary gear 40 side in the axial direction of the small-diameter portion 50b of the output shaft 50 is the wheel hub. An inlay fit is provided on the inner peripheral surface 51 d of the hole 51. Further, the wheel hub 51 is fixed to be prevented from coming off by a nut 53 being screwed to the tip end portion 50 a of the output shaft 50.

  A hub portion 51b formed in a disk shape is provided at an end portion in the axial direction of the wheel hub 51, and a plurality of bolt holes 51c formed in the hub portion 51b are provided with hub bolts 101 described later in detail. Is inserted, and the wheel 100 is fastened to the hub bolt 101 by a nut 102 to form a wheel 200.

  A hub bearing 52 is disposed on the outer peripheral side of the sleeve portion 51a formed in the hollow shape of the wheel hub 51 between the bearing case (outer peripheral member) 52A. The hub bearing 52 directly supports the ball mechanism of the hub bearing 52 on the inner peripheral side of the bearing case 52A, and the hub shaft 52 and the wheel hub 51 allow the output shaft 50 and the wheel hub 51 to rotate freely. The hub unit bearing 60 to support is comprised. As shown in FIG. 4, a flange portion 52Aa integrally formed in a flange shape is provided on the outer peripheral side of the bearing case 52A, and the flange portion 52Aa is a tip of a hub arm 92 of a suspension device 90 described later in detail. The support part 95 is fixed to the support part 95 and is abutted on and fixed to the support part 95 by a plurality of bolts 61.

  The hub bearing 52 is in contact with the side surface of the sleeve 54, and the tip of the opposite side of the sleeve 54 is in contact with the flange portion 50d, so that the positioning support accuracy in the axial direction of the output shaft 50 is ensured satisfactorily. is doing.

  The above-mentioned bearing case 52A is fitted in a fitting hole 95a formed in a support portion 95 of a suspension device 90, which will be described later in detail, on the outer peripheral surface on the in-wheel motor drive device 1 side in the axial direction from the flange portion 52Aa. A centering surface 52Ab is formed. The centering surface 52Ab of the bearing case 52A is formed concentrically with the rotation center of the output shaft 50 and the wheel 100.

  A plurality of bolt holes 95c are formed in the support portion 95 of the suspension device 90, and the outer peripheral side of the opening portion from which the output shaft 50 of one main case 2A projects (details of an inlay fitting surface 2Ac to be described later in detail). On the outer peripheral side, a suspension fixing portion 2Aa having an increased thickness is formed and a plurality of bolt holes 2Ad are formed, and the bolts 12 are screwed into the bolt holes 95c and the bolt holes 2Ad. Thus, the support portion 95 of the suspension device 90 and the case 2 of the in-wheel motor drive device 1 are fixedly supported.

  Further, on the inner peripheral side of the suspension fixing portion 2Aa of the main case 2A and on the outer peripheral side of the outer edge portion 2Ab that forms the outer edge of the opening portion from which the output shaft 50 projects, the output shaft 50 and the rotation center of the wheel 100 are concentric. A spigot fitting surface 2Ac is formed, and the spigot fitting surface 2Ac is arranged in parallel with the centering surface 52Ab of the bearing case 52A in the axial direction so as to fit into the fitting hole 95a of the support portion 95. It is comprised so that it may fit.

  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 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 the ring gear 41 whose rotation is fixed, and the reduced rotation of the carrier 46 is output. It is transmitted to the shaft 50 and the wheel hub 51, and the wheel 200 is rotationally driven as a driving rotation.

  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 25a and the idler gear 22 as a speed increasing rotation, the rotor shaft 7 is driven to rotate, and the stator 4 is set to a negative voltage so that the rotor 5 The counter electromotive force acts on the stator 4 and the electric power is supplied to the power source through the inverter circuit or the like, so that the power source is charged.

  In addition, since the motor 3 of the present in-wheel motor drive device 1 is an induction motor as described above, for example, in a traveling state in which other wheels (for example, front wheels) are driven by a hybrid drive device (not shown), Even when the motor 3 is idling without power running control, no counter electromotive force is generated, and particularly when the motor 3 is in high speed traveling at a high speed, the torque generated by the counter electromotive force is canceled. There is no need to perform so-called weakening magnetic field control, which can improve the fuel efficiency of the vehicle.

  Next, the structure of the wheel 200 provided with the in-wheel motor drive device 1 and the state of attachment of the wheel 200 to the vehicle (suspension device 90) will be described with reference to FIGS.

  The wheel 200 is roughly constituted by the wheel 100, the disc brake device 70, and the above-described in-wheel motor drive device 1, and is attached to the suspension device 90, so that the predetermined wheel 200 is fixed to the vehicle. The movement of the range is allowed, and the vibration of the wheel 200 is absorbed.

  The wheel 100 is made of a general general-purpose product. As shown in FIG. 1, the rim portion 100a is connected by connecting a drum-shaped rim portion 100a to which a tire (not shown) is attached and an end portion of the rim portion 100a. A disk-shaped disk portion 100b to be supported, and the same number of bolt holes 100c are formed at positions corresponding to the plurality of bolt holes 51c of the wheel hub 51 in the inner peripheral portion of the disk portion 100b. Has been.

  Therefore, when the wheel 100 is attached to the wheel hub 51, the bolt hole 100c of the wheel 100 is aligned with the hub bolt 101 screwed into the bolt hole 51c of the wheel hub 51, and the hub bolt 101 is aligned with the bolt hole. The wheel 100 is attached to the wheel hub 51 by installing the wheel 100 so as to penetrate through 100 c and further fastening with the nut 102. When the wheel 100 is attached to the wheel hub 51, the brake disc 71 of the disc brake device 70 is fastened together and fastened to the wheel 100 and the wheel hub 51 (that is, the output shaft 50) so as not to rotate relative to each other. The

  The disc brake device 70 is roughly configured to include the brake disc 71 and a caliper 72 that sandwiches the brake disc 71 between brake pads 75 and 75 and rubs it. The brake disc 71 has an annular rubbing portion 71a on which the brake pads 75, 75 are rubbed, and a flange-like flange portion 71b that supports the rubbing portion 71a. Further, the flange portion 71b is formed with the same number of through holes 71c at positions corresponding to the bolt holes 51c of the wheel hub 51 and the bolt holes 100c of the wheel 100, and the hub bolt 101 passes through the through holes 71c. By being assembled in this manner, the brake disc 71 is fastened together when the wheel 100 is fastened to the wheel hub 51 as described above.

  As shown in FIG. 1, the caliper 72 roughly includes a piston portion 73, a cylinder portion 74, and brake pads 75 and 75. The brake pads 75 and 75 are supported by pad holders 76 and 76, respectively, and are disposed to face both side surfaces of the rubbing portion 71 a of the brake disc 71. The cylinder portion 74 is formed in a U shape in a cross-sectional view, has a support portion 74a that supports a brake pad 75 on one axial side (left side in FIG. 1), and is fixed to the torque member 77. .

  The piston portion 73 incorporates a piston (not shown) that can be driven by brake oil supplied from an oil passage (not shown), and when the brake oil is supplied, the other side in the axial direction (right in FIG. 1). The piston pad (not shown) is pressed toward the sliding portion 71a of the brake disc 71 and the reaction force is received by the support portion 74a of the cylinder portion 74, so that the brake pads 75 and 75 The rubbing portion 71a of the brake disc 71 is sandwiched and rubbed. Note that levers of the side brake mechanism 80 are disposed on the side surface of the piston portion 73.

  The caliper 72 is fixed to the cylinder portion 74 by fixing the torque member 77 to a support portion 95 of the suspension device 90 described later via a bolt 79 (see FIG. 2). The caliper 72 is fixed.

  Then, the attachment state with respect to the suspension apparatus 90 of the wheel 200 is demonstrated. As shown in FIGS. 3 and 4, the suspension device 90 includes a cross beam 91 having a V-shaped cross-sectional view that spans the vehicle in the left-right direction, and a tray that extends from the end of the cross beam 91 toward the front side of the vehicle. A ring arm 93, a link 94 for engaging the trailing arm 93 with the vehicle, a hub arm 92 extending from the intersection of the cross beam 91 and the trailing arm 93 toward the wheel 200, and a tip of the hub arm 92 are fixed. And a plate-like support portion 95. A shock absorber (not shown), a damper device, or the like (not shown) is disposed above the end of the cross beam 91, and position control in the vertical direction with respect to the vehicle body and vibration absorption of vertical movement are performed.

Toward the first lower portion from the front portion of the cylindrical portion 2CY ₁ of the main case 2A, has a space between the rim portion 100a of the wheel 100, as shown in FIGS. 3 and 4, Habuamu 92 It passes through the lower side from the first front side of the cylindrical portion 2CY ₁ of the main casing 2A. As described above, the support portion 95 fixed to the tip of the hub arm 92 is inlay-fitted to the centering surface 52Ab of the bearing case 52A of the hub bearing 52 and the inlay fitting surface 2Ac of the case 2, and the bolt 12 Are fastened to the case 2 by bolts 61 and fastened to the bearing case 52 </ b> A of the hub bearing 52 by bolts 61. As a result, the suspension device 90 supports the wheel 100 via the hub bearing 52 and also supports the in-wheel motor drive device 1.

  That is, the configuration in which the hub arm 92 of the suspension device 90 is extended to the outer peripheral portion of the hub bearing 52 in this way can take substantially the same configuration as a general configuration of a wheel that does not include an in-wheel motor drive device. That is, the in-wheel motor drive device 1 can be attached without substantially changing the suspension device 90 and the disc brake device 70.

  As described above, according to the present in-wheel motor drive device 1, the spigot fitting surface 2Ac of the case 2 is formed concentrically with the rotation center of the output shaft 50 (that is, the first shaft AX1), and the hub bearing 52 Since the centering surface 52Ab and the centering surface 52Ab are aligned in the axial direction in the fitting hole 95a of the support portion 95 of the suspension device 90 that fits in the centering surface 52Ab, the center axis of the wheel 100 and the The shaft alignment with the output shaft 50 of the wheel motor driving device 1 can be positioned with high accuracy, and it is possible to prevent vibrations, prevent noise, improve durability, and the like.

  In addition, the fitting hole 95a of the support portion 95 of the suspension device 90 is configured to fit in-lay with the centering surface 52Ab of the hub bearing 52 even in a vehicle on which the in-wheel motor drive device 1 is not mounted. Since the case 2 of the in-wheel motor drive device 1 can be in-lobe fitted using the fitting hole 95a, the design of the wheel 100 can be made without making a design change that constitutes a new in-lobe fitting portion. It is possible to position the center alignment of the center shaft and the output shaft 50 of the in-wheel motor drive device 1 with high accuracy.

  Furthermore, since the case 2 has the suspension fixing portion 2Aa fixed to the support portion 95 of the suspension device 90 on the outer peripheral side of the spigot fitting surface 2Ac, the in-wheel motor drive device 1 is connected to the support portion of the suspension device 90. 95, and the suspension device 90 is not structured to support the wheel 100 via the case 2 of the in-wheel motor drive device 1. No vehicle load is applied to the case 2, for example, it is not necessary to increase the thickness of the case 2 and strengthen it, and the in-wheel motor drive device 1 can be made compact and lightweight. .

  In the in-wheel motor drive device 1 of the present embodiment described above, the driving force of the motor 3 is folded back in a U shape via the reduction gear mechanism 20 and is applied to the output shaft 50 via the reduction planetary gear 40. The transmission structure has been described. For example, the output shaft, the speed reduction mechanism, and the motor are configured on one axis, and the motor 3 is configured to protrude from the speed reduction gear mechanism 20 toward the vehicle body. The present invention can be applied even if it is changed.

  In the present embodiment, an induction motor is used as a rotating electric machine. However, for example, an IPM motor (permanent magnet built-in motor) may be used, and the rotating electric machine is not limited to this and can be powered and regenerated. Anything is acceptable.

  In the present embodiment, the speed reduction planetary gear 40 is described as an example of the speed reduction mechanism, but any speed reduction mechanism may be used. As the speed reduction mechanism, for example, a cycloid speed reducer (Japanese Patent Laid-Open No. 2009-58005), a roller speed reducer (Japanese Patent Laid-Open No. 2006-103521), and the like are conceivable.

  In the present embodiment, the reduction gear mechanism 20 has been described as having the small-diameter gear 21, the idler gear 22, and the large-diameter gear 25a. However, for example, the rotation of the rotor shaft 7 is reduced via a belt or a chain. 40 may be configured to transmit to 40.

  Further, the in-wheel motor drive device 1 according to the present embodiment is basically mounted on the right 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 one in which the front-rear direction is reversed (the shape shown on the mirror surface) in FIGS.

DESCRIPTION OF SYMBOLS 1 In-wheel motor drive device 2 Case member 2Aa Fixed part (suspension fixed part)
2Ac Inlay fitting surface 3 Rotating electrical machine 50 Output shaft 52 Hub bearing 52A Outer peripheral member (bearing case)
52Ab Centering surface 90 Suspension device 95 Support portion 95a Fitting hole 100 Wheel 200 Wheel AX1 Center of rotation (first axis)

Claims (2)

In an in-wheel motor drive device that is attached to the inside of a wheel of a wheel that is rotatably supported via a hub bearing supported by a support portion of the suspension device, and that can drive the wheel by a rotating electrical machine housed in a case member ,
The suspension device is formed in a concentric shape with a rotation center of an output shaft that outputs a driving force of the rotating electrical machine, and is inlay-fitted to a centering surface formed on an outer peripheral surface of an outer peripheral member of the hub bearing. In the fitting hole of the support portion, there is a spigot fitting surface that is arranged in parallel with the centering surface in the axial direction and fits in the spigot.
An in-wheel motor drive device characterized by that. The case member has a fixed portion fixed to the support portion of the suspension device on an outer peripheral side of the spigot fitting surface.
The in-wheel motor drive device according to claim 1.

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