JP2019167005A - In-wheel motor driving device - Google Patents

Abstract

To provide an in-wheel motor driving device which enables a wheel speed detector to be arranged without affecting a length of the in-wheel motor driving device as seen in an axle direction and enables control of a gap between a detected part and a rotary sensor to be easily performed.SOLUTION: A wheel speed detector (6) includes: a detected part (61) which is disposed in a hat part (52) of a brake rotor (5) and generates flux change in a circumferential direction; and a rotary sensor (62) which is attached to an outer ring (13) of an inner ring rotation type wheel hub bearing part (11) or a hub support member supporting the outer ring so as to face the detected part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-wheel motor drive device, and more particularly to an in-wheel motor drive device including a wheel speed detection device that detects rotation of a wheel.

  In recent years, automobiles equipped with ABS (anti-lock brake system) are increasing for safety improvement. In the ABS, a wheel speed detection device that detects the rotation of the wheel is used. The wheel speed detection device includes a sensor target provided at a rotating portion that rotates integrally with the wheel, and a rotation sensor (wheel speed sensor) that is attached to face the sensor target. The detection signal of the rotation sensor is transmitted to a control device attached to the vehicle body, and the control device controls the brake mechanism such as adjusting the brake hydraulic pressure of the wheel. Such a rotation sensor is used not only for ABS but also for ESC (side slip prevention device).

  Japanese Patent Laying-Open No. 2013-152023 (Patent Document 1) discloses a configuration in which a pulsar ring (sensor target) is disposed in a hat portion of a brake disk. In Cited Document 1, the pulsar ring includes a flange portion that extends in the radial direction and is attached to the hat portion, and a detected portion that is bent from the flange portion and extends in the axle direction to face the rotation sensor.

JP 2013-152023 A

  To avoid interference between the in-wheel motor drive device and the inner wall of the wheel housing formed on the outer side in the vehicle width direction of the vehicle body without sacrificing the interior space, the length of the in-wheel motor drive device in the axle direction is shortened. There is a need to. In addition, when the in-wheel motor drive device is mounted on a steered wheel, the length of the in-wheel motor drive device in the direction of the axle is greater than the case where the in-wheel motor drive device is mounted on a non-steer wheel in order to arrange the device without sacrificing the steered angle. It is necessary to further shorten the length.

  The configuration in which the pulsar ring is arranged in the hat portion of the brake disc as in Patent Document 1 is advantageous in that it does not affect the axial length of the in-wheel motor drive device.

  Further, in Patent Document 1, since a position adjustment unit is provided on a holding member that holds a rotation sensor, and a gap between the detected part of the pulsar ring and the rotation sensor can be adjusted, manufacturing errors and assembly of other parts Errors can be tolerated. As a result, it is possible to prevent a decrease in detection accuracy of the rotation sensor.

  However, in Patent Document 1, since the rotation sensor is attached to the casing of the in-wheel motor drive device, there are cases in which the number of parts interposed from the attachment site of the rotation sensor to the detected part increases. In this case, it becomes difficult to manage the gap between the detected portion and the rotation sensor.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to arrange the wheel speed detection device without affecting the axial length of the in-wheel motor drive device, and It is an object to provide an in-wheel motor drive device that can easily manage a gap between a detected portion and a rotation sensor.

  An in-wheel motor drive device according to an aspect of the present invention is coaxially coupled to a brake rotor having a hat portion formed so as to be recessed outward in the vehicle width direction, and is fixed to be non-rotatable with an inner ring that rotates integrally with the brake rotor. And a wheel hub bearing portion including an outer ring. This in-wheel motor drive device is arranged in a hat portion of a brake rotor, and a detected portion that generates a magnetic flux change in the circumferential direction, and an outer ring of the wheel hub bearing portion or an outer ring so as to face the detected portion And a rotation sensor attached to a hub support member for supporting the wheel.

  Preferably, the wheel speed detection device further includes a holding member for attaching the rotation sensor to the flange portion or the hub support member of the outer ring.

  Preferably, at least a part of the holding member is disposed radially inward from the outer ring of the flange portion of the outer ring or the hub support member.

  Preferably, the holding member has a flat portion parallel to the detected portion, and the rotation sensor is fixed to the flat portion of the holding member.

  The planar portions of the detected portion and the holding member are desirably arranged so as to be orthogonal to the axis of the wheel.

  In this case, a fitting hole for fitting the rotation sensor may be provided in the flange portion of the outer ring or the hub support member.

  The planar portions of the detected portion and the holding member may be disposed obliquely with respect to the wheel axis.

  Preferably, the holding member is fixed to the flange portion of the outer ring or the hub support member by a fastening member that is passed from the outside in the vehicle width direction.

  According to the present invention, the wheel speed detection device can be arranged without affecting the length in the axle direction of the in-wheel motor drive device. In addition, it is possible to easily manage the gap between the detected portion and the rotation sensor.

It is sectional drawing which shows typically the basic composition of the in-wheel motor drive device which concerns on Embodiment 1 of this invention. It is a front view which shows typically the attachment structure of the rotation sensor in Embodiment 1 of this invention. It is sectional drawing which shows typically the attachment structure of the rotation sensor in the modification 1 of Embodiment 1 of this invention. It is a front view which shows typically the attachment structure of the rotation sensor in the modification 1 of Embodiment 1 of this invention. It is sectional drawing which shows typically the attachment structure of the wheel hub bearing part and rotation sensor in the modification 2 of Embodiment 1 of this invention. It is a front view which shows typically the attachment structure of the wheel hub bearing part and rotation sensor in the modification 2 of Embodiment 1 of this invention. It is sectional drawing which shows typically the attachment structure of the wheel hub bearing part and rotation sensor in the modification 3 of Embodiment 1 of this invention. It is a front view which shows typically the attachment structure of the wheel hub bearing part and rotation sensor in the modification 3 of Embodiment 1 of this invention. It is a figure which shows typically the fitting part for positioning provided in the outer ring flange in the modification 3 of Embodiment 1 of this invention. It is sectional drawing which shows typically the attachment structure of the wheel speed detection apparatus which concerns on Embodiment 2 of this invention. In Embodiment 2 of this invention, it is the perspective view which looked at the brake disc with which the pulsar ring was attached from the vehicle width direction outer side. In Embodiment 2 of this invention, it is the perspective view which looked at the brake disc with which the pulsar ring was attached from the vehicle width direction inner side.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  The in-wheel motor drive device according to the present embodiment is equipped with a wheel speed detection device that detects the rotation of the wheel. The wheel is a wheel of a passenger car such as an electric car or a hybrid vehicle.

<Embodiment 1>
(Basic configuration example of in-wheel drive device)
First, with reference to FIG. 1 and FIG. 2, a basic configuration example of the in-wheel motor drive device 1 according to the present embodiment and a peripheral structure thereof will be described.

  FIG. 1 is a developed cross-sectional view showing the in-wheel motor drive device 1. FIG. 2 is a schematic front view showing the in-wheel motor drive device 1 and shows a state in which the in-wheel motor drive device 1 is viewed from the outside in the vehicle width direction. In FIG. 1, the right side of the drawing represents the inner side in the vehicle width direction (inboard side), and the left side of the drawing represents the outer side in the vehicle width direction (outboard side). The cross section shown in FIG. 1 is a developed plane obtained by connecting the plane including the axis M and the axis N shown in FIG. 2 and the plane including the axis N and the axis O in this order. In FIG. 2, the right side of the drawing represents the rear of the vehicle, the left side of the drawing represents the front of the vehicle, the upper side of the drawing represents the upper side of the vehicle, and the lower side of the drawing represents the lower side of the vehicle.

  The in-wheel motor drive device 1 includes a wheel hub bearing portion 11 provided at the center of a wheel, a motor portion 21 that rotationally drives the motor shaft 22, and the rotation of the motor shaft 22 is decelerated and transmitted to the wheel hub bearing portion 11. A deceleration unit 31. The speed reducer constituting the speed reducing unit 31 is, for example, a triaxial parallel shaft type gear speed reducer. The motor unit 21 and the speed reduction unit 31 are arranged offset from the axis O of the wheel hub bearing unit 11. The axis O extends in the vehicle width direction and coincides with the axle direction.

  The wheel hub bearing portion 11, the speed reduction portion 31, and the motor portion 21 are housed inside the wheel (inside air region), that is, in the wheel wheel W. Note that at least a part of the motor unit 21 may be disposed on the inner side in the vehicle width direction than the wheel wheel W in order to avoid interference with the wheel. The in-wheel motor drive device 1 is connected to the wheel wheel W to drive the wheel. A wheel is comprised by the wheel wheel W and the tire fitted to the outer periphery. In the following description, one side in the axis O direction means the outside in the vehicle width direction, and the other in the axis O direction means the inside in the vehicle width direction.

  The entire housing 10 of the in-wheel motor drive device 1 is configured by the motor housing 20 that forms the outline of the motor section 21 and the speed reducer housing 30 that forms the outline of the speed reduction section 31 and the wheel hub bearing section 11.

  The wheel hub bearing portion 11 includes an inner ring 12 that is a rotating element, an outer ring 13 that is a fixed element, and a plurality of rolling elements 14 that are arranged in an annular gap between the inner and outer rings. A flange (hereinafter referred to as “outer ring flange”) 13 f is erected on the outer peripheral surface of the outer ring 13. When viewed from the front, the outer ring flange 13f has a star shape, and the outer ring flange 13f includes a plurality of (five) protruding portions (joining portions) 13a provided at intervals in the circumferential direction. The outer diameter of the outer ring 13 is maximized at the protruding portion 13a and is minimized at a portion (hereinafter referred to as a “dented portion”) 13b located between the protruding portions 13a adjacent in the circumferential direction.

  A through hole is formed in the protruding portion 13 a of the outer ring 13. Each through-hole extends in parallel with the axis O, and a bolt 83 is passed from one side in the axis O direction. A shaft portion of each bolt 83 is screwed into a female screw hole formed in the front portion 30 f of the reduction gear housing 30. Thereby, the outer ring 13 is connected and fixed to the front portion 30f. The outer ring 13 is fixed to a carrier (not shown) at the lower end.

  The inner ring 12 is a cylindrical body that is longer than the outer ring 13 and is passed through the center hole of the outer ring 13. That is, the outer ring 13 is disposed on the outer periphery of the inner ring 12. A flange (hereinafter referred to as “inner ring flange”) 12 f is formed at one end portion in the axis O direction of the inner ring 12 projecting outward from the outer ring 13 in the vehicle width direction. The inner ring flange 12f is arranged away from the outer ring flange 13f on one side in the axis O direction.

  When viewed from the front, the inner ring flange 12f has a petal shape, and the inner ring flange 12f includes a plurality of protrusions (coupling parts) 12a provided at intervals in the circumferential direction and a plurality of valleys positioned between the protrusions. Part 12b. The outer diameter of the inner ring 12 is maximum at the protrusion 12a and minimum at the trough 12b.

  The protruding portion 12a of the inner ring flange 12f as the hub flange constitutes a coupling seat portion for coupling coaxially with the brake disk 5 and a wheel (not shown). The inner ring 12 is coupled with the wheel by the projection 12a of the inner ring flange 12f by the wheel bolt 82, and rotates integrally with the wheel. The wheel bolt 82 is passed through the through hole 12h of the protrusion 12a from the other side in the axis O direction.

  The brake disc 5 includes a rotor portion 51 sandwiched between brake pads 80 supported by a brake caliper 81, and a hat portion 52 formed so as to be recessed outward in the vehicle width direction from an inner diameter side end portion of the rotor portion 51. ing. The rotor part 51 and the hat part 52 are integrally formed.

  The hat portion 52 includes a bottom wall portion 53 that extends in the radial direction, and an outer peripheral portion 54 that is connected to the outer peripheral edge portion of the bottom wall portion 53 and has a cylindrical inner diameter surface, and has an axis O as the center. A cylindrical inner space region is defined. Since the outer peripheral portion 54 corresponds to an annular step formed in the brake disc 5, the outer peripheral portion 54 is also referred to as an annular step 54 hereinafter. The bottom wall portion 53 corresponds to an inner diameter region located on the inner diameter side with respect to the annular step 54. The rotor portion 51 corresponds to an outer diameter region located on the outer diameter side with respect to the annular step 54.

  A plurality of through holes are provided in the bottom wall portion 53 of the hat portion 52, and the wheel bolt 82 described above passes through the through hole 12 h provided in the protruding portion 12 f of the inner ring 12 and the through hole. As shown in FIG. 2, the maximum outer diameters of the inner ring 12 and the outer ring 13 of the wheel hub bearing portion 11 are smaller than the diameter of the annular step 54 of the brake disc 5 (that is, the inner diameter of the outer peripheral portion 54 of the hat portion 52). . The maximum outer diameter of the outer ring 13 is larger than the maximum outer diameter of the inner ring 12. When viewed in the direction of the axis O, the head of the bolt 83 is positioned on the outer diameter side of the inner ring flange 12f and does not overlap the inner ring flange 12f.

  The motor unit 21 includes a motor shaft (motor rotation shaft) 22, a rotor 23, a stator 24, and the motor housing 20 described above. The motor unit 21 is sequentially arranged from the axis M of the motor unit 21 to the outer diameter side in this order. The motor unit 21 is an inner rotor, outer stator type radial gap motor, but may be of other types. For example, although not shown, the motor unit 21 may be an axial gap.

  An axis M that becomes the rotation center of the motor shaft 22 and the rotor 23 extends away from the axis O of the wheel hub bearing portion 11 in the vehicle longitudinal direction and extends in parallel with the axis O. That is, the motor unit 21 is disposed offset from the axis O of the wheel hub bearing unit 11 so as to be separated from the front of the vehicle, for example. Both ends of the motor shaft 22 are rotatably supported by the motor housing 20 via rolling bearings 27 and 28.

  The reduction unit 31 is a three-axis parallel shaft type gear reducer, and includes an output gear 36 that is coaxially coupled to the inner ring 12, an input gear 32 that is coaxially coupled to the motor shaft 22 of the motor unit 21, and an input gear. A plurality of intermediate gears 33 and 35 for transmitting rotation from 32 to the output gear 36 and the reduction gear housing 30 described above are provided.

  The input gear 32 is a small-diameter external gear, and is a large number of teeth formed on the outer periphery of the other end portion in the axial direction of the shaft portion 32 s arranged along the axis M. The axis of the shaft portion 32s coincides with the axis M. By inserting a protrusion 22p formed at one end in the axis M direction of the motor shaft 22 into the center hole 32h of the shaft portion 32s, the shaft portion 32s is fitted to the motor shaft 22 so as not to be relatively rotatable.

  The shaft portion 32 s is an input shaft, and is rotatably supported by the reduction gear housing 30 via rolling bearings 32 m and 32 n on both ends of the input gear 32. The small-diameter input gear 32 meshes with a first intermediate gear 33 that becomes a large-diameter external gear. The intermediate gear 33 is coupled coaxially with a second intermediate gear 35 that becomes a small-diameter external gear by an intermediate shaft 34. Both ends of the intermediate shaft 34 are rotatably supported by the speed reducer housing 30 via rolling bearings 34m and 34n.

  An axis N passing through the center of the intermediate shaft 34 extends in parallel with the axis O of the wheel hub bearing portion 11 and is positioned between the axis O and the axis M in the vehicle longitudinal direction. Thus, the speed reduction part 31 is arranged offset from the wheel hub bearing part 11. The axis N of the deceleration unit 31 is disposed above the axis O.

  The small-diameter second intermediate gear 35 meshes with the large-diameter output gear 36. The output gear 36 is an external gear provided coaxially with the output shaft 15. The output shaft 15 is rotatably supported by the front portion 30f of the speed reducer housing 30 via the rolling bearing 36m on the one side in the axis O direction than the output gear 36. Further, the output shaft 15 is rotatably supported on the back wall 30b of the reduction gear housing 30 via the rolling bearing 36n on the other side in the axis O direction than the output gear 36.

  When power is supplied to the coil 26 from the outside of the in-wheel motor drive device 1, the rotor 23 of the motor unit 21 rotates and outputs rotation from the motor shaft 22 to the speed reduction unit 31. The speed reduction part 31 decelerates the rotation input to the input shaft 32 s from the motor part 21 and outputs it from the output shaft 15 to the wheel hub bearing part 11. The inner ring 12 of the wheel hub bearing portion 11 rotates at the same rotational speed as the output shaft 15 and drives a wheel (road wheel W) (not shown) attached and fixed to the inner ring 12.

  The wheel speed detection device 6 according to the present embodiment detects the speed of the wheel by detecting the rotation of the brake disc 5 that is coaxially coupled with the inner ring 12 as a wheel hub.

<About wheel speed detection device>
The wheel speed detection device 6 will be described in detail with reference to FIGS. 1 and 2. The wheel speed detection device 6 includes a detected portion 61 that is provided in the rotating portion and causes a magnetic flux change in the circumferential direction, and a rotation sensor 62 that is provided in the fixed portion. The wheel speed detection device 6 in the present embodiment employs, for example, a passive method.

  In the present embodiment, the pulsar ring 60 having the detected portion 61 is disposed in the hat portion 52 of the brake disc 5 and attached to the brake disc 5. The pulsar ring 60 is made of, for example, a magnetic material (thin steel plate).

  The pulsar ring 60 is formed of a plate-like member orthogonal to the axis O, and is attached so as to be in surface contact with the inner side surface of the bottom wall portion 53 of the hat portion 52. The outer diameter of the pulsar ring 60 is at least larger than the maximum outer diameter of the inner ring flange 12f. The outer diameter of the pulsar ring 60 is larger than the maximum outer diameter of the outer ring flange 13f, but may be smaller.

  The pulsar ring 60 includes an annular portion centered on the axis O, and an attachment portion 64 that protrudes radially inward from the inner peripheral edge of the annular portion. The detected portion 61 is provided on the surface of the annular portion that faces the inner side in the vehicle width direction. The detected portion 61 is formed by unevenness repeatedly provided in the circumferential direction.

  A plurality of attachment portions 64 are provided, for example, at intervals in the circumferential direction. The attaching portion 64 is provided with a through hole, and the pulsar ring 60 is fixed to the bottom wall portion 53 of the hat portion 52 by a screw member 71 that is passed through the through hole. The screw member is a kind of fastening member. The fastening member includes a screw, a bolt, a screw and the like.

  The centering of the pulsar ring 60 is performed using a jig. Since the central cylindrical portion of the bottom wall portion 53 of the hat portion 52 in the brake disk 5 is fitted to the inner ring 12 as a wheel hub, the swinging of the pulsar ring 60 fixed to the bottom wall portion 53 is prevented.

  The rotation sensor 62 is attached to the outer ring 13 that is a fixed portion of the wheel hub bearing portion 11 so as to face the detected portion 61 of the pulsar ring 60. The rotation sensor 62 is constituted by a pickup coil, for example.

  Specifically, the rotation sensor 62 is attached to the outer ring flange 13f via a flat plate-like holding member 63. The holding member 63 is fixed in contact with one end surface (the surface facing the vehicle width direction outer side) in the axis O direction of the outer ring flange 13f. The end face of the outer ring flange 13 f is disposed orthogonal to the axis O and parallel to the pulsar ring 60. Therefore, the holding member 63 and the pulsar ring 60 are arranged in parallel.

  The holding member 63 is provided with a plurality of through holes 63a and 63b. The through hole 63a is a hole through which the screw member 72 is passed, and for example, two (a plurality) are provided. The through hole 63b is a hole through which the rotation sensor 62 passes. In the present embodiment, the rotation sensor 62 passed through the through hole 63b of the holding member 63 is fixed to the holding member 63 in advance by integral molding or press fitting.

  The holding member 63 is preferably attached to the recessed portion 13b of the outer ring flange 13f. In this case, the screw member 72 passed through the through hole 63a from one side in the axis O direction is screwed into the female screw hole 13c provided in the recess 13b of the outer ring flange 13f. As shown in FIG. 2, when viewed from the direction of the axis O, the entire head of the screw member 72 is disposed outside the minimum outer diameter of the inner ring 12, and at least a part of the head of the screw member 72 is It is arranged inside the maximum outer diameter of the inner ring 12.

  The holding member 63 has a portion 63p that protrudes radially outward from the recess 13b of the outer ring flange 13f in the attached state, and the rotation sensor 62 is held in this portion 63p. The through hole 63b is provided in a position of the portion 63p that faces the detected portion 61 of the pulsar ring 60.

  The rotation sensor 62 extends linearly from the front end to the rear end, and is held by the holding member 63 so that the front end faces outward in the vehicle width direction. Since the through hole 63b of the holding member 63 extends in parallel with the axis O, the detection surface 62a that is the front end surface of the rotation sensor 62 and the detected portion 61 of the pulsar ring 60 are simply passed through the through hole 63b. Can be parallel.

  As described above, according to the present embodiment, since the holding member 63 of the rotation sensor 62 is configured by a plane (flat thin plate) parallel to the detected portion 61, the detection surface 62a of the rotation sensor 62 and the detected target are detected. The distance (gap) between the portions 61 can be easily managed. Specifically, the axial dimension of a part interposed between the holding member 63 and the detected portion 61 (for example, the distance from the holding member 63 to the inner ring flange 12f, the holding member 63 to the detection surface 62a of the rotation sensor 62). The distance between the detection surface 62a of the rotation sensor 62 and the detected portion 61 can be made unnecessary.

  Not only the axial dimension of the parts interposed between the holding member 63 and the detected part 61 but also the axial dimension of the pulsar ring 60 (detected part 61), the mating surface of the brake disk 5 and the pulsar ring 60 By further managing the deflection of the brake, the gap after the brake disk 5 is assembled to the inner ring flange 12f can be determined more accurately.

  In addition, since the holding member 63 of the rotation sensor 62 is configured by a plane parallel to the detected portion 61, even if the holding member 63 is displaced in the gap of the through hole 63a through which the screw member 72 is inserted, Since the holding member 63 is displaced only in the radial direction, the axial position of the rotation sensor 62 does not change. Therefore, the gap management between the detection surface 62a of the rotation sensor 62 and the detected part 61 can be facilitated.

  Further, since the rotation sensor 62 is attached not to the casing 10 but to the outer ring flange 13f disposed outside the casing 10, the number of components interposed from the attachment site to the detected portion 61 can be reduced. Thereby, the gap management between the to-be-detected part 61 and the rotation sensor 62, ie, the dimension management of the wheel speed detection apparatus 6, can be made easy. Moreover, the process of the casing 10 can be saved.

  Further, in the present embodiment, the holding member 63 is fixed to the recessed portion 13b of the outer ring flange 13f (that is, the portion located between the protruding portions 13a adjacent in the circumferential direction), and the outer circumference circle (the outer ring 13) of the outer ring flange 13f. The circle having the largest outer diameter, i.e., the circle passing through the outer diameter side edges of all the protruding portions 13a) is disposed radially inward of C1. As a result, the radial dimension of the wheel speed detection device 6 can be reduced, and the wheel speed detection device 6 can be disposed in the hat portion 52 of the brake disc 5.

  Although it is desirable that the entire through hole 63b of the holding member 63 is located radially inward of the outer circumferential circle C1 of the outer ring flange 13f, at least a part of the through hole 63b is more radial than the outer circumferential circle C1. What is necessary is just to be located inside.

  In the present embodiment, the rotation sensor 62 is attached from the outside in the vehicle width direction via the holding member 63. Therefore, even when the rotation sensor 62 is disposed at a position overlapping the output gear 36 when viewed in the direction of the axis O (the radial position of the rotation sensor 62 and the output gear 36 overlaps), the wheel hub bearing portion 11 is disassembled. Without rotation, the rotation sensor 62 can be easily replaced.

(Modification 1)
In the present embodiment, the rotation sensor 62 is fixed to the holding member 63. However, as shown in FIGS. 3 and 4, a holding member 163 in which the rotation sensor 162 is detachable may be employed. . 3 and 4 are diagrams schematically showing a wheel speed detection device 6A in the present modification.

  In the portion 63p of the holding member 163, in addition to the through hole 63b for fitting the main body of the rotation sensor 162, a through hole 63c through which the screw member 73 that has passed through the fixing piece 62b of the rotation sensor 162 is passed is provided. ing.

  A female screw (not shown) is cut on the inner wall of the through hole 63c, and the screw member 73 is passed through the through hole 63c from the inner side in the vehicle width direction. The screw member 73 is screwed into the through hole 63c in a state where the fixing piece 62b of the rotation sensor 162 is sandwiched between the head and the holding member 163.

  According to this modification, the rotation sensor 162 can be attached and detached from the outside in the vehicle width direction using the rotation sensor 162 of the type inserted into the stay (holding member) from the inside in the vehicle width direction. As a result, a general-purpose rotation sensor 162 inserted from the inside in the vehicle width direction can be used, so that parts can be shared and costs can be reduced.

(Modification 2)
In the present embodiment, the holding member 63 that holds the rotation sensor 62 is fixed to the outer ring flange 13f. However, as shown in FIGS. 5 and 6, the outer ring flange 113f is interposed via the hub support member 16. In this case, the holding member 63 may be fixed to the hub support member 16. FIG. 5 and FIG. 6 are diagrams schematically showing the attachment structure of the wheel hub bearing portion 11A and the rotation sensor in the present modification. The hub support member 16 corresponds to a hub attachment (intermediate member) disposed between the outer ring 113 and the casing 10, but the hub support member 16 is a component of the outer ring 113 in this modification. .

  The outer diameter (maximum outer diameter) of the outer ring flange 113f is smaller than the outer diameter (maximum outer diameter) of the outer ring flange 13f of Embodiment 1, and is substantially the same as the outer diameter (maximum outer diameter) of the inner ring flange 12f. The outer diameter (maximum outer diameter) of the hub support member 16 is larger than the outer diameter of the outer ring flange 113f.

  The outer ring flange 113f is fixed only to the hub support member 16 by a bolt 84 passed from one side in the axis O direction, and the hub support member 16 is fixed to the casing 10 by a bolt 85 passed from one side in the axis O direction. Yes. The head of the bolt 85 is disposed on the outer diameter side of the head of the bolt 84.

  The hub support member 16 has a star shape similar to the outer ring flange 13f, and includes a plurality of protrusions 16a and a plurality of recesses 16b. The protrusion 16a of the hub support member 16 and the protrusion 13a of the outer ring flange 113f are arranged in alignment with the axis O as the center.

  In this case, the holding member 63 that holds the rotation sensor 62 is fixed to the recessed portion 16b of the hub support member 16, and the outer circumference of the hub support member 16 (a circle that maximizes the outer diameter of the hub support member 16, that is, It is desirable that the projections 16a be disposed radially inward of the circles C2 passing through the outer edges of the protrusions 16a. Thereby, also in this modification, it is possible to make the radial dimension of the wheel speed detection device 6 small.

(Modification 3)
In the present embodiment, the rotation sensor 62 is positioned by fixing the holding member 63 to the outer ring flange 13f by a plurality of (for example, two) screw members 72. However, the rotation sensor 62 is shown in FIGS. As described above, the holding member 263 may be fixed to the outer ring flange 213f by one screw member 72. 7 and 8 are diagrams schematically showing a wheel speed detection device 6B in the present modification.

  The outer ring flange 213f has a fitting portion 13p for positioning the rotation sensor 62, which is provided continuously with one of the plurality of recessed portions 13b. The fitting part 13p protrudes to the outer diameter side from the central part in the circumferential direction of the single recessed part 13b. The fitting portion 13p is provided with a fitting hole 13q penetrating along the axis O.

  The through hole 63b of the holding member 263 is overlapped with the fitting hole 13q, and the rotation sensor 62 is passed through the fitting hole 13q of the fitting portion 13p and the through hole 63b of the holding member 263. As a result, the rotation sensor 62 can be positioned even if the holding member 263 is fixed to the outer ring flange 213f at one location. Therefore, since the area of the plane of the holding member 253 can be made smaller than that in the first embodiment, the degree of freedom in arranging the rotation sensor 62 can be improved.

  In this modification, as shown in FIG. 9, it is desirable to provide a notch 13r in the fitting portion 13p of the outer ring flange 213f. The notch 13r is linearly provided from the fitting hole 13q toward the radially outer side. Thus, even when the cable 62c of the rotation sensor 62 is arranged on the inner side in the vehicle width direction, the cable 62c can be passed through the notch 13r, so that the holding member 263 holding the rotation sensor 62 can be attached and detached. It can be done from the outside.

(Other variations)
In the present embodiment, an example in which the pulsar ring 60 having the detected portion 61 is attached to the bottom wall portion 53 of the hat portion 52 of the brake disc 5 has been shown. If it is arranged facing inward, it is not limited to such an example of attachment. For example, the bottom wall portion 53 itself of the hat portion 52 may be provided with unevenness as a detected portion.

<Embodiment 2>
In the first embodiment, the detected portion 61 of the pulsar ring 60 and the holding member 63 that holds the rotation sensor 62 are arranged so as to be orthogonal to the axis O. In the present embodiment, These are arranged obliquely with respect to the axis O.

  With reference to FIGS. 10-12, the attachment structure of the wheel speed detection apparatus 6C which concerns on this Embodiment is demonstrated. FIG. 10 is a cross-sectional view schematically showing the wheel speed detection device 6C. FIGS. 11 and 12 are perspective views of the brake disk 5 to which the pulsar ring 60A is attached, and show the brake disk 5 as viewed from the outside and the inside in the vehicle width direction.

  The wheel speed detection device 6 </ b> C includes a pulsar ring 60 </ b> A, a rotation sensor 62, and a holding member 65 that holds the rotation sensor 62. The wheel hub bearing portion in the present embodiment has the same configuration as the wheel hub bearing portion 11A in the second modification of the first embodiment, and the outer ring flange 113f is fixed to the casing 10 via the hub support member 16. And

  The pulsar ring 60A has a detected portion 61 and a flange portion 64A. The pulsar ring 60A is fixed to the bottom wall portion 53 of the hat portion 52 of the brake disc 5 at the flange portion 64A. The detected portion 61 extends in the axle direction from the radially inner edge of the flange portion 64A, and is formed in a conical shape so as to have a smaller diameter toward the inside in the vehicle width direction.

  Bolts 74 are fixed in advance to the bottom wall portion 53 of the hat portion 52 of the brake disc 5, and through holes for inserting the bolts 74 are provided in the flange portion 64A. The flange portion 64 </ b> A is attached to the bottom wall portion 53 of the hat portion 52 by a nut 75 screwed into the tip end portion of the bolt 74. A countersunk screw may be interposed between the flange portion 64A and the nut 75. The flange portions 64A may be configured in a ring shape as shown in FIGS. 11 and 12, or a plurality of flange portions 64A may be provided at equal intervals along the circumferential direction.

  Also in this embodiment, the centering of the pulsar ring 60A is performed using a jig. Since the central cylindrical portion 50 of the bottom wall portion 53 of the brake disc 5 is fitted with the inner ring 12 as a wheel hub, the pulsar ring 60A fixed to the bottom wall portion 53 is prevented from swinging. In FIG. 11 and FIG. 12, a through hole 53 a for inserting the wheel bolt 82 provided in the bottom wall portion 53 of the brake disk 5 is shown.

  As in the first embodiment, the holding member 65 is fixed to one end surface of the hub support member 16 in the axis O direction by a screw member 72 from the outside in the vehicle width direction. The holding member 65 includes a mounting portion 651 extending in the radial direction and a holding portion 652 extending obliquely from the radial outer end edge of the mounting portion 651 toward the outer side in the vehicle width direction. The holding part 652 is inclined so that the angle with the attaching part 651 becomes an obtuse angle.

  The attachment portion 651 is provided with a through hole 65a for allowing the screw member 72 to pass therethrough, and the holding portion 652 is provided with a through hole 65b for allowing the rotation sensor 62 to pass therethrough. The holding portion 652 may further be provided with a female screw hole 65c into which the screw member 73 for fastening the fixing piece 62b of the rotation sensor 62 is screwed.

  The angle formed by the attaching portion 651 and the holding portion 652 of the holding member 65 is substantially the same as the angle formed by the flange portion 64A of the pulsar ring 60A and the detected portion 61. That is, the holding portion 652 of the holding member 65 constitutes a plane portion parallel to the detected portion 61. Accordingly, the detection surface 62a of the rotation sensor 62 can be arranged in parallel to the detected portion 61 by simply passing the rotation sensor 62 straight through the through hole 65b provided in the holding portion 652 of the holding member 65. .

  According to the present embodiment, since the holding portion 652 that holds the rotation sensor 62 is disposed obliquely with respect to the axis O, the radial distance from the rotation sensor 62 to the brake disk 5 is greater than that in the first embodiment. Can take longer. Thereby, since the thermal influence of the brake disc 5 that generates heat during braking can be suppressed, the detection accuracy of the wheel speed by the rotation sensor 62 can be improved.

  Further, according to the present embodiment, since at least a part of the rotation sensor 62 can be disposed inside the output gear 36, the diameter of the pulsar ring 60 can be reduced. Thereby, since the shake of the pulsar ring 60 can be suppressed, the detection accuracy of the wheel speed can be improved.

  When the rotation sensor 62 is attached to the hub support member 16 as in the present embodiment, the attachment portion of the holding member 65 may be integrated with the hub support member 16. Thereby, the number of parts can be reduced, and the cost and the number of assembly steps can be reduced.

  The casing 10 is generally made of an aluminum alloy to reduce the weight. However, the hub support member 16 is made of steel and has a smaller coefficient of thermal expansion than the aluminum alloy, and the amount of deformation with respect to temperature changes. Less is. Therefore, when the rotation sensor 62 is attached to the hub support member 16, the influence on the rotation sensor 62 can be suppressed.

  Also in the present embodiment, the rotation sensor 62 may be attached to the outer ring flange.

<Other embodiments>
In each of the embodiments described above, the wheel speed detection device adopting the passive method has been described. However, the active method may be employed. In that case, for example, a known magnetic encoder may be employed as the detected part of the pulsar ring. The magnetic encoder is an annular magnet in which an N pole and an S pole are repeatedly arranged in the circumferential direction. In this case, the rotation sensor 62 reads the strength of magnetism accompanying the rotation of the magnetic encoder.

  In the above description, the brake disc is shown as the disc-type brake rotor. However, a drum-type brake rotor may be used. Moreover, although the reduction part 31 showed the example which is a parallel 3 axis | shaft type gear reducer which has the axis lines O, N, and M extended in parallel mutually, the structure of the reduction part 31 is not limited, for example, it is a planetary gear type reduction gear. It may be applied to a machine or a cycloid reduction gear.

  Moreover, you may combine said each embodiment and modification.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 In-wheel motor drive device, 5 Brake disc, 6, 6A, 6B, 6C Wheel speed detection apparatus, 10 Casing, 11, 11A Wheel hub bearing part, 12 Inner ring, 13, 113 Outer ring, 13f, 113f, 213f Outer ring flange, 14 Rolling body, 15 Output shaft, 16 Hub support member, 20 Motor housing, 21 Motor portion, 30 Reduction gear housing, 31 Reduction portion, 32 Input gear, 32s Input shaft, 33, 35 Intermediate gear, 34 Intermediate shaft, 36 Output Gear, 51 Rotor part, 52 Hat part, 53 Bottom wall part, 54 Annular step (outer peripheral part), 60, 60A Pulsar ring, 61 Detected part, 62, 162 Rotation sensor, 63, 65, 163, 253, 263 Member, W Wheel wheel.

Claims (7)

A wheel hub bearing portion including an inner ring that is coaxially coupled to a brake rotor having a hat portion formed so as to be recessed outward in the vehicle width direction and rotates integrally with the brake rotor, and an outer ring that is fixed so as not to rotate. In-wheel motor drive device,
The outer ring of the wheel hub bearing part or the outer ring is supported so as to face the detected part and a detected part that is arranged in the hat part of the brake rotor and generates a magnetic flux change in a circumferential direction. An in-wheel motor drive device comprising: a wheel speed detection device including a rotation sensor attached to a hub support member. The wheel speed detection device further includes a holding member for attaching the rotation sensor to a flange portion of the outer ring or the hub support member,
2. The in-wheel motor drive device according to claim 1, wherein at least a part of the holding member is disposed radially inward of an outer peripheral circle of the flange portion of the outer ring or the hub support member. The holding member has a plane portion parallel to the detected portion,
The in-wheel motor drive device according to claim 2, wherein the rotation sensor is fixed to the planar portion of the holding member.   The in-wheel motor drive device according to claim 3 with which said plane part of said detected part and said holding member is arranged so that it may intersect perpendicularly with an axis of said wheel hub bearing part.   The in-wheel motor drive device according to claim 4, wherein a fitting hole for fitting the rotation sensor is provided in the flange portion of the outer ring or the hub support member.   4. The in-wheel motor drive device according to claim 3, wherein the detected portion and the planar portion of the holding member are disposed obliquely with respect to an axis of the wheel hub bearing portion.   The in-wheel motor drive device according to claim 2, wherein the holding member is fixed to the flange portion of the outer ring or the hub support member by a fastening member that is passed from the outside in the vehicle width direction.

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