JP2019048555A - Bearing device for wheel with generator and vehicle provided with bearing device for wheel with generator - Google Patents

Abstract

To provide a bearing device for wheel with a generator which has assemblability equivalent to a conventional bearing for wheel and can extend a mounting space of a generator than a conventional bearing for wheel, and to provide a vehicle provided with the bearing device for wheel with the generator.SOLUTION: A bearing device 1 for wheel with a generator includes: a bearing 2 for vehicle having an outer ring 4 and an inner ring 5 which has a hub flange 7, is rotatably supported by the outer ring 4 via a rolling body 6 and has the wheel of the vehicle and a brake rotor 12 mounted on a hub flange 7; a stator 19 mounted on the outer ring 4; and a generator 3 having a rotor 19 mounted on the inner ring 5. The outer ring 4 has a flange 20 for fitting including a flange part 20b which is provided on the outer peripheral surface of the outer ring 4 and is positioned close to the inboard side of a knuckle 8, and the flange 20 for fitting is composed separately from the outer ring 4 and is fastened to the knuckle 8.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bearing device for a wheel with a generator and a vehicle equipped with the bearing device for a wheel with a generator, and relates to a technology capable of expanding the mounting space of the generator.

  As shown in FIGS. 10 to 12, a general wheel bearing includes a mounting flange 60 a provided integrally with the outer ring 60, and the mounting flange 60 a is mounted on the knuckle 61. The mounting flange 60a abuts on the knuckle 61 from the vehicle body outer side (outboard side), and is fastened by the knuckle 61 and a bolt 62 inserted from the vehicle body inner side (inboard side). As the wheel bearing is mounted by a vehicle manufacturer, good assembly is required.

  A wheel bearing having a general flange structure for attachment to a knuckle is disclosed (Patent Document 1). In this wheel bearing, bolts are fastened from the knuckle surface, and the mounting flange for the wheel bearing is held outside the vehicle body.

  Although the in-wheel motor structure (patent documents 2, 3) which incorporates a motor in a wheel needs to mount the inverter and battery which operate a motor on a vehicle body, it is not necessary to mount a power unit in a vehicle body. Therefore, power can be applied to the vehicle without occupying the volume of the vehicle body, and the degree of freedom in designing the vehicle body is also high. However, since the motor output is proportional to the motor volume, in order to obtain a large output torque, it is necessary to enlarge the motor or to use a speed reduction mechanism or the like. In-wheel motors with large motor volumes or reduction mechanisms are difficult to fit in the wheel, and the conventional wheel bearing suspension can not be used, and structural changes around the body of the vehicle can not be avoided .

Patent No. 4306903 gazette Patent No. 4694147 Patent No. 4724075

  The motor volume is small in order to support the motive power of the vehicle body only with the wheel bearing and the in-wheel motor that fits in the brake rotor. Therefore, in order to increase the output torque, it is necessary to provide a reduction mechanism or to increase the motor size. However, it is difficult to fit a large motor in the wheel, and it is possible to use a method of bolting the knuckle surface and the flange surface with a bolt like the conventional fixing method for wheel bearings, especially when the motor is enlarged in the axial direction. In addition, structural changes around the body of the vehicle can not be avoided.

  On the other hand, it is conceivable to mount an in-wheel motor as a power assist system of a hybrid system having as a main power means another power mechanism such as an internal combustion engine. In this case, it is not necessary to use the in-wheel motor alone to support the power of the vehicle, but by driving the in-wheel motor according to the traveling state of the vehicle or the state of the main power means, regenerative braking and charging Power performance can be improved, but there are the following issues in terms of required functions and cost-effectiveness.

・ No need to modify the structure of peripheral parts ・ Similar mounting performance to conventional wheel bearings ・ Reduced number of parts ・ High output torque in limited space

  As described in the background art, in a typical wheel bearing, the mounting flange structure is in contact with the vehicle knuckle surface from the outboard side, and is fastened with a bolt from the inboard side. Since the wheel bearing holds the axle load and the tire-road load input from the tire by the mounting flange, the vehicle knuckle surface, and the bolt, the fixing position of the bolt is away from the wheel center of rotation It is desirable that the However, when the outer diameter of the mounting flange is increased, the motor generator and the mounting flange interfere with each other, so the space in which the motor generator can be mounted is only between the mounting flange and the hub flange.

  SUMMARY OF THE INVENTION The object of the present invention is to provide a bearing device for a wheel with a generator, which has the same installability as a conventional wheel bearing and can expand the mounting space of the generator more than the conventional wheel bearing, An object of the present invention is to provide a vehicle provided with a machined wheel bearing device.

A generator-equipped wheel bearing apparatus according to the present invention has a fixed wheel and a hub flange, and is rotatably supported by the fixed wheel via a rolling element, and a wheel and a brake rotor of a vehicle are attached to the hub flange. In a bearing device for a wheel with a generator, comprising a wheel bearing having a wheel, a stator attached to the fixed wheel, and a generator having a rotor attached to the rotating wheel,
The fixed ring has an outer ring positioned radially inward of the stator, and a mounting flange including a flange portion provided on the outer peripheral surface of the outer ring and positioned more inboard than the vehicle-side mounting member. The mounting flange is configured separately from the outer ring and is fastened to the vehicle-side mounting member.

According to this configuration, since the rotor of the generator is a direct drive type mounted on the rotating wheel of the wheel bearing, the number of parts of the generator is small, the configuration is simple and space saving is achieved, and the increase in vehicle weight is suppressed. Be
Since the flange portion of the mounting flange is positioned on the inboard side of the vehicle-side mounting member, power generation can be achieved compared to the case where the generator is mounted on the conventional wheel bearing whose mounting flange is positioned on the outboard side of the knuckle. The axial mounting space of the machine can be expanded. Therefore, the output torque can be increased.

  Further, since the mounting flange is formed separately from the outer ring and fastened to the vehicle-side mounting member, for example, the generator-equipped wheel bearing device can be easily assembled to the vehicle-side mounting member as follows. . After mounting the generator on the wheel bearing, position the assembly subassembly with the generator on the outboard side of the vehicle-side mounting member with the mounting flange separate from the outer ring. Thereafter, the mounting flange is fastened from the inboard side of the vehicle-side mounting member. Therefore, according to this bearing apparatus for a wheel with a generator, it has the assemblability equivalent to the conventional bearing for wheels.

  The wheel bearing may be a bearing that supports a driven wheel that is mechanically disconnected from a main drive source of the vehicle. In this case, since the generator has a simple and space-saving configuration, the generator can be easily installed on the driven wheel without changing the structure or the like of the underbody of the vehicle body.

  The wheel bearing may be a bearing that supports a drive wheel mechanically coupled to a main drive source of the vehicle. As described above, since the number of parts of the generator is small and the configuration is simple and space saving is required, the generator can be easily installed on the drive wheels without changing the structure of the underbody of the vehicle body etc. .

  The generator includes a rotary case integrally provided on the inner ring which is the rotary wheel and covers the rotor and the stator, and the rotary case is fixed to an outer diameter surface of the hub flange of the inner ring, and the rotary case is The rotor may be fixed to the inner periphery of the rotor. In this case, since the rotation case is fixed to the outer diameter surface of the hub flange, the rotor can be configured without changing the axial position of the brake rotor. In addition, since the axial dimension does not increase for fixing the rotating case, the space in the outer periphery of the outer ring can be used more widely for the installation of the generator.

  The whole of the generator is smaller in diameter than the outer peripheral part of the brake rotor where the brake caliper is pressed, and the whole of the generator except the mounting portion to the hub flange is the wheel bearing May be located in an axial range between the inboard side of the vehicle mounting surface and the hub flange. In this case, a space for installing the generator can be secured in the brake rotor to make the generator compact.

  Each center of the double-row rolling elements in the wheel bearing may be disposed within the range of the axial width β of the stator. In this case, the facing area of the stator and the rotor can be increased without largely changing the configurations of general wheel bearings and brakes, and the output of the generator can be increased.

  The drive voltage or regenerative voltage for rotational drive of the generator may be 100 V or less. In this case, the risk of an electric shock to a passenger or a maintenance worker can be reduced. By mounting the bearing device for wheels with a generator and a medium voltage battery of 100 V or less as a battery for a generator in an existing vehicle equipped with only an internal combustion engine, the vehicle can be mild without major remodeling. It can be a hybrid vehicle.

  A vehicle according to the present invention includes the generator equipped wheel support bearing device described in any of the above. According to this configuration, it is possible to provide the vehicle with the generator-equipped wheel bearing device without changing the structure of the underbody of the vehicle body. Fuel consumption can be reduced by the bearing device for a wheel with a generator.

  A generator-equipped wheel bearing apparatus according to the present invention has a fixed wheel and a hub flange, and is rotatably supported by the fixed wheel via a rolling element, and a wheel and a brake rotor of a vehicle are attached to the hub flange. In a bearing apparatus for a wheel with a generator including a wheel bearing having a wheel, a stator attached to the fixed wheel, and a generator having a rotor attached to the rotating wheel, the fixed wheel is The stator has an outer ring positioned radially inward of the stator, and a mounting flange including a flange portion provided on the outer peripheral surface of the outer ring and positioned closer to the inboard side than the vehicle-body-side mounting member. The outer ring and the outer ring are formed separately and are fastened to the vehicle-side mounting member. For this reason, it has assemblability equivalent to the conventional wheel bearing, and the mounting space of a generator can be expanded rather than the conventional wheel bearing.

  The vehicle according to the present invention includes the generator-equipped wheel bearing device described in any of the above, and therefore, has the same ease of installation as the conventional wheel bearing and is more suitable for the generator than the conventional wheel bearing. Implementation space can be expanded.

FIG. 1 is a cross-sectional view of a generator equipped wheel support bearing assembly according to an embodiment of the present invention. It is a fractured perspective view of the bearing device for wheels with the same generator. It is an exploded view of the bearing device for wheels with the same generator. It is a disassembled perspective view of the bearing apparatus for wheels with the said generator. It is sectional drawing of the bearing apparatus for wheels with a generator which concerns on other embodiment of this invention. It is sectional drawing of the bearing apparatus for wheels with a generator which concerns on other embodiment of this invention. FIG. 1 is a block diagram showing a conceptual configuration of a vehicle system of a vehicle provided with any one of the generator equipped wheel bearing devices. It is a power supply system figure used as an example of the vehicles carrying the system for vehicles. It is a figure explaining the conceptual composition of the system for vehicles of other vehicles provided with the bearing apparatus for wheels with a generator. It is sectional drawing of the bearing for wheels etc. of a prior art example. It is the side view which disassembled the bearing for wheels, the brake rotor, and the knuckle. It is the perspective view which decomposed | disassembled the bearing for wheels, the brake rotor, and the knuckle.

A generator-equipped wheel bearing apparatus according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIG. 1, the generator equipped wheel bearing apparatus 1 includes a wheel bearing 2 and a generator 3.

<About wheel bearing 2>
The wheel bearing 2 has an outer ring 4 and a mounting flange 20 which are fixed wheels, a double row of rolling elements 6 and an inner ring 5 which is a rotating ring. The inner ring 5 is rotatably supported by the outer ring 4 via the rolling elements 6 in double rows. Grease is enclosed in the bearing space between the inner and outer rings 5 and 4. The inner ring 5 has a hub flange 7 at a location protruding toward the outboard side in the axial direction with respect to the outer ring 4. The mounting flange 20 is configured separately from the outer ring 4, and is fixed to the inboard side of the outer peripheral surface of the outer ring 4 by a lead-in nut 21.

  The mounting flange 20 has a cylindrical portion 20a and a flange portion 20b. The cylindrical portion 20a is disposed such that one end in the axial direction abuts on the step portion of the outer peripheral surface of the outer ring 4, and the flange portion 20b extends radially outward from the other axial end of the cylindrical portion 20a. The flange portion 20b is positioned closer to the inboard than the knuckle 8 which is a vehicle-body-side mounting member. The mounting flange 20 is fixed to the outer ring 4 by bringing the flange portion 20 b into contact with the inboard side surface of the knuckle 8 and tightening the lead-in nut 21.

  As shown in FIG. 4, the flange portion 20b is provided with insertion holes 20c through which a plurality of (four in this example) fastening bolts 22 described later are inserted. In this specification, when the generator-equipped wheel bearing device is mounted on a vehicle, the side closer to the outside in the vehicle width direction of the vehicle is called the outboard side, and the side closer to the center in the vehicle width direction Is called the inboard side.

As shown in FIG. 1, the hub bolt 7 with the wheel rim (not shown), the brake rotor 12 and the case bottom 11 (described later) axially overlapped on the side surface on the outboard side of the hub flange 7 It is attached by 13. A tire is attached to the outer periphery of the rim.
When the wheel bearing device 1 is attached to a vehicle, the double row rolling elements 6 include an inner side rolling element row 6a positioned on the inner side and an outer side rolling element row 6b positioned on the outer side.

<About the brake 17>
The brake 17 is a friction brake provided with a disc-type brake rotor 12 and a brake caliper not shown. The brake rotor 12 has a flat portion 12a and an outer peripheral portion 12b. The flat portion 12 a is an annular and flat member overlapping the hub flange 7 via the case bottom 11. The outer circumferential portion 12 b extends from the flat plate portion 12 a to the outer circumferential side of the outer ring 4. The outer peripheral portion 12b is a cylindrical portion 12ba cylindrically extending from the outer peripheral edge of the flat portion 12a to the inboard side, and a flat portion 12bb extending from the inboard end of the cylindrical portion 12ba to the outer diameter side And.

  The brake caliper has a friction pad (not shown) for holding the flat plate portion 12bb of the brake rotor 12. The brake caliper is attached to the knuckle 8. The brake caliper may be either hydraulic or mechanical, or may be electric motor.

<About generator 3 grade>
The generator 3 of this example is a motor generator for traveling assistance that generates electric power by rotation of the wheel and can rotationally drive the wheel by being supplied with electricity. The generator 3 has a rotating case 15, a stator 18 and a rotor 19. The rotating case 15 is attached to the hub flange 7 of the inner ring 5 and covers the rotor 19 and the stator 18. The generator 3 is an outer rotor motor in which the rotor 19 is located radially outward of the stator 18.

  In the generator 3, the entire radial range L <b> 2 is smaller in diameter than the outer peripheral portion 12 b of the brake rotor 12. Furthermore, the whole of the generator 3 except for the mounting portion to the hub flange 7 is located in the axial range L1 between the inboard vehicle body mounting surface of the wheel bearing 2 and the hub flange 7. That is, the generator 3 is accommodated in the radial range between the outer peripheral portion 12 b of the brake rotor 12 and the outer periphery of the outer ring 4, and for the axial range L 1, the cylindrical portion 12 ba in the outer peripheral portion 12 b of the brake rotor 12 is , Part of the generator 3 (half on the outboard side) is included.

The generator 3 in the illustrated example is an outer rotor type IPM (Interior Permanent Magnet) synchronous motor (or denoted as IPMSM (Interior Permanent Magnet Synchronous Motor)).
In addition, the generator 3 may adopt various types such as a switched reluctance motor (abbreviation: SR motor), an induction motor (induction motor: abbreviation: IM), and the like. In each motor type, each type of distributed winding and concentrated winding can be adopted as a winding type of the stator 18.

  As shown in FIGS. 2 to 4, the rotation case 15 is formed of a bottomed cylindrical case main body 16, and the case main body 16 has a case bottom 11 and a case cylindrical portion 25. The case bottom 11 and the case cylindrical portion 25 are integrally or separately formed. The case bottom 11 is a flat and annular member sandwiched between the flat portion 12 a of the brake rotor 12 and the hub flange 7. A case cylindrical portion 25 extends cylindrically from the outer peripheral edge of the case bottom 11 toward the inboard side. A seal 23 described later is disposed between the rotating case 15 and the knuckle surface.

  As shown in FIGS. 1 and 2, on the inner peripheral surface of the case cylindrical portion 25, a small diameter portion 25a on the outboard side, a step portion 25b, and a large diameter portion 25c on the inboard side are provided. The rotor 19 includes a magnetic body provided on the inner periphery of the rotation case 15 and a permanent magnet (not shown) built in the magnetic body. The rotor 19 is provided on the large diameter portion 25 c of the inner peripheral surface of the case cylindrical portion 25 by adhesion or the like. When the outboard side end of the rotor 19 abuts on the step portion 25 b of the case cylindrical portion 25, the rotor 19 is axially positioned with respect to the rotation case 15.

The stator 18 is attached to the outer peripheral surface of the outer ring 4 via a stator holding member 24. The stator 18 has a core 18a and coils 18b wound around the teeth of the core 18a.
As shown in FIGS. 2 and 4, the stator holding member 24 holds the stator 18 in contact with the inner peripheral surface of the stator 18 and the inboard end surface. The stator holding member 24 has a stator holding body 24a and a flange 24b. The stator holding body 24a and the flange 24b are integrally or separately formed.

  The stator holding main body 24 a is a cylindrical member provided between the inner peripheral surface of the stator 18 and the outer peripheral surface of the outer ring 4. The outer peripheral surface of the stator holding main body 24a is provided with a fitting portion in which a plurality of protrusions 24aa extending in the axial direction are formed so as to protrude a predetermined distance outward in the radial direction from the outer peripheral surface. The plurality of protrusions 24aa are formed at regular intervals in the circumferential direction. The inner peripheral surface of the stator 18 is formed with a fitting portion comprising a plurality of grooves 18c fitted to the fitting portion comprising a plurality of protrusions 24aa. The fitting portion and the fitted portion constitute a rotation stopping mechanism that prevents relative rotation between the stator holding member 24 and the stator 18.

  The flange 24 b extends radially outward from the inboard end of the stator holding body 24 a. The flange 24 b is provided between the inboard end surface of the stator 18 and the disk-like spacer 28. A spacer 28 is interposed between the inboard end face of the stator 18 and the knuckle 8.

  The knuckle 8 is formed with a through hole 8a for allowing insertion of the outer peripheral surface of the cylindrical portion 20a in the mounting flange 20, and a plurality of female screws 8b matching the phases of the plurality of insertion holes 20c in the mounting flange 20 ing. A plurality of fastening bolts 22 are respectively inserted into the plurality of insertion holes 20 c from the inboard side of the mounting flange 20 and screwed to the respective female screws 8 b of the knuckle 8. As a result, the outer ring 4 and the mounting flange 20 are held, and the stator holding member 24, the spacer 28, the knuckle 8, and the mounting flange 20 are fixed.

<Positional relationship between rolling element 6 and stator 18>
Here, as shown in FIG. 1, the inner side rolling element row 6a and outer side rolling equal body row 6b of the double row rolling elements 6 in the direction of the rotation axis O and the rotation axis O of the wheel bearing 2 Assuming that the axial distance between the centers of the two is the distance α, and the width of the stator 18 of the generator 3 in the direction of the rotation axis O is the width β, the generator equipped wheel bearing device 1 has a relationship of distance α <width β. .

  As described above, by making the width β in the axial direction of the stator 18 in the direction of the rotation axis O larger than the distance α between the centers of the double-row rolling elements 6, the facing area between the stator 18 and the rotor 19 is increased. It is possible to increase the output of the generator 3. However, assuming that the distance α <width β, when a moment load in the direction of the rotational axis O is generated at the end in the motor O axial direction, misalignment of the bearings is likely to occur, and inclination between the wheel bearing and the tire Backlash may occur. However, this can be solved by applying an appropriate preload to the wheel bearing 2.

  However, the width β is smaller than the inboard end of the hub flange 7 of the wheel bearing 2 than the vehicle mounting surface on the outboard side of the wheel bearing 2, and the coil end, connection and wiring of the stator 18 are not limited to the hub flange 7. Between the inboard end of the vehicle and the vehicle mounting surface on the outboard side of the wheel bearing 2. The coil end is a projecting portion of a coil that protrudes axially outward relative to the stator core.

  Further, in the rotation axis O direction, the centers of the rolling elements 6 in multiple rows are disposed within the range of the axial width β of the stator 18. In other words, the centers of the double-row rolling elements 6 are disposed between the inner end surface 18 aa of the stator 18 and the outer end surface 18 ab of the stator 18. In the double row rolling elements 6, even when the inner side end portion of the inner side rolling element row 6a is positioned closer to the inner (inboard) side than the inner side end face 18aa of the stator 18, the inner of the stator 18 If the side end face 18 aa is positioned closer to the inner (inboard) side than the center of the inner side rolling element row 6 a, it is included in the category of the present invention.

<About seal structure>
An annular seal 23 is fitted to the outer peripheral edge of the spacer 28 to prevent the entry of water and foreign matter into the generator 3 and the wheel bearing 2. The seal 23 has an inner cylindrical portion and an outer cylindrical portion provided at predetermined distances in the radial direction, and a standing plate portion connecting the inner cylindrical portion and the outer cylindrical portion. The inner cylindrical portion, the outer cylindrical portion, and the standing plate portion are integrally formed. The inner cylindrical portion is fitted and fixed to the outer peripheral edge portion of the spacer 28, and the standing plate portion is closely provided on the side of the outboard of the knuckle 8. Further, on the outer peripheral surface of the outer cylindrical portion, a lip protruding a predetermined small distance outward in the radial direction is provided, and this lip is in sliding contact with the inner peripheral surface of the case cylindrical portion 25. Such a seal 23 can prevent the entry of water and foreign matter into the generator 3 and the wheel bearing 2.

<Rotation detector etc>
The generator-equipped wheel bearing device 1 is provided with a rotation detector (not shown). The rotation detector detects the rotational speed of the inner ring 5 relative to the outer ring 4 in order to control the rotation of the generator 3 which is a motor generator for traveling assistance. For example, a resolver is applied as the rotation detector. As the rotation detector, for example, a magnetic detector such as a magnetic encoder, or an optical detector such as a laser or infrared may be adopted.

  A cover 27 is provided on the end surface of the wheel bearing 2 on the vehicle body side. The cover 27 has a cylindrical shape with a bottom, and has a cylindrical portion fitted and fixed to the inner peripheral surface of the outer ring 4 on the inboard side, and a bottom portion closing the inboard end of the cylindrical portion. The cover 27 prevents water and foreign matter from entering the inside of the wheel bearing.

<Function effect>
According to the bearing apparatus 1 for a wheel with a generator described above, the rotor 19 of the generator 3 is a direct drive type mounted on the rotating wheel of the bearing 2 for a wheel, so the number of parts of the generator 3 is small. Is simple and space-saving, and the increase in vehicle weight is also suppressed.
Since the flange portion 20b of the mounting flange 20 is closer to the inboard side than the knuckle 8, power generation can be performed more than when a generator is provided to a conventional wheel bearing whose mounting flange is on the outboard side of the knuckle The axial mounting space of the machine 3 can be expanded. Therefore, the output torque can be increased.

  The mounting flange 20 is configured separately from the outer ring 4 and is fastened to the knuckle 8. For example, the bearing device 1 with a generator can be easily assembled to the knuckle 8 as follows. After the generator 3 is mounted on the wheel bearing 2, the mounting flange 20 is positioned on the outboard side of the knuckle 8, with the mounting flange 20 being separate from the outer ring 4. Thereafter, the mounting flange 20 is fastened from the inboard side of the knuckle 8. Therefore, according to the generator-equipped wheel bearing apparatus 1, it has an assembling property equal to that of the conventional wheel bearing.

  The whole of the generator 3 has a diameter smaller than that of the outer peripheral portion 12b of the brake rotor 12, and the whole of the generator 3 excluding the mounting portion to the hub flange 7 corresponds to the vehicle mounting surface of the wheel bearing 2 on the inboard side. And the hub flange 7, the space for installing the generator 3 can be secured in the brake rotor 12 to make the generator 3 compact.

By making the width β in the axial direction of the stator 18 larger (by α <β) than the distance α between the centers of the double-row rolling elements 6, the configuration of general wheel bearings and brakes is largely changed. Instead, the facing area between the stator 18 and the rotor 19 can be increased, and the output of the generator 3 can be increased.
Even when the centers of the double-row rolling elements 6 are disposed within the range of the axial width β of the stator 18, the stator 18 and the general wheel bearing and brake configuration are not significantly changed. The area facing the rotor 19 can be increased, and the output of the generator 3 can be increased.

<Other Embodiments>
In the following description, the portions corresponding to the items described in advance in each embodiment are denoted by the same reference numerals, and the redundant description will be omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in the preceding embodiment unless otherwise stated. The same function and effect can be obtained from the same configuration. Not only the combination of the portions specifically described in the embodiments but also the embodiments may be partially combined if any problem does not occur in the combination.

  As shown in FIG. 5, the rotation case 15 is formed of a case cylindrical portion 25, and the outboard side end of the inner peripheral surface of the case cylindrical portion 25 is fixed to the outer diameter surface of the hub flange 7 of the inner ring 5. It is also good. In this case, the rotor 19 can be configured without changing the axial position of the brake rotor 12. In addition, the axial dimension does not increase due to the fixing of the rotation case 15, and the space in the outer periphery of the outer ring 4 can be widely used for the installation of the generator 3.

  As shown in FIG. 6, the case bottom 11 of the rotating case 15 may be fixed to the side of the hub flange 7 of the inner ring 5 opposite to the wheel mounting surface. Also in this case, the rotor 19 can be configured without changing the axial position of the brake rotor 12. Further, since the case bottom 11 of the rotating case 15 overlaps the hub flange 7 of the inner ring 5, the rigidity of the rotating case 15 can be increased. Thereby, the rotation accuracy of the rotor 19 can be improved.

In each embodiment, the stator holding member 24 constituting the anti-rotation mechanism is sandwiched between the outer ring 4 and the stator 18, but the stator 18 may be directly fitted to the outer peripheral surface of the outer ring 4. Further, the outer ring 4 and the stator 18 may be fastened by fastening parts such as bolts. With such a configuration, the wheel bearing 2 and the stator 18 can be disassembled.
The holding structure of the mounting flange 20 with respect to the outer ring 4 is not limited to the above-described nut tightening using the fastening bolt 22. For example, after spline fitting of the outer peripheral surface of the outer ring 4 and the inner peripheral surface of the mounting flange 20 or fitting of the inner peripheral surface of the mounting flange 20 on the outer peripheral surface of the outer ring 4, nut fastening, caulking, welding, It may be fixed by any method such as adhesion.
In each embodiment, a so-called second generation hub bearing is applied as the wheel bearing 2 in which the outer ring 4 having double-row rolling contact surfaces and the attachment member to the knuckle 8 are formed as separate members. A first generation hub bearing may be applied to the second generation hub bearing, in which an inner ring having a plurality of rolling contact surfaces and a hub flange portion are separate parts.

<About the system for vehicles>
FIG. 7 is a block diagram showing a conceptual configuration of a vehicle system using the generator equipped wheel support bearing assembly 1 according to any one of the embodiments.
In the vehicle system, the generator equipped wheel support bearing assembly 1, in a vehicle having a driven wheel 10 _B is a main drive source mechanically unconnected, it is mounted against the driven wheel 10 _B. Wheel bearing 2 in the generator equipped wheel support bearing assembly 1 (Fig. 1) is a bearing supporting the driven wheel 10 _B.

The main drive source 35 is an internal combustion engine such as a gasoline engine or a diesel engine, or a motor generator (electric motor), or a hybrid drive source combining both. The "motor generator" refers to an electric motor capable of generating power by rotation. In the illustrated example, the vehicle 30 is a front wheel drive car whose front wheels are drive wheels 10 _A and rear wheels are driven wheels 10 _B, and the main drive source 35 is an internal combustion engine 35 a and a motor generator 35 b on the drive wheels side. It is a hybrid car (hereinafter may be referred to as "HEV").

Specifically, it is a mild hybrid type in which the motor generator 35b on the drive wheel side is driven by a medium voltage such as 48V. Hybrids can be broadly divided into Strong Hybrids and Mild Hybrids, but Mild Hybrids, whose main drive source is an internal combustion engine, is a type that mainly assists driving with a motor when starting or accelerating. In the (electric car) mode, it can be distinguished from the strong hybrid because normal travel can be performed for a while but can not be performed for a long time. Internal combustion engine 35a of the example of the figure, is connected to the drive shaft of the drive wheel 10 _A via the clutch 36 and speed reducer 37, the motor generator 35b of the driving wheel is connected to a reduction gear 37.

This vehicle system is provided in the generator 3 which is a motor generator for traveling assistance which rotationally drives the driven wheel 10 _B , the individual control means 39 which controls the generator 3, and the host ECU 40. It includes an individual motor generator command means 45 for outputting a command to cause the individual control means 39 to perform drive and regeneration control. The generator 3 is connected to the storage means. The storage means may be a battery (storage battery) or a capacitor, a capacitor, etc. The type and mounting position on the vehicle 30 are not limited. In this embodiment, the low voltage battery 50 mounted on the vehicle 30 and The medium voltage battery 49 of the medium voltage battery 49 is used.

The driven wheel generator 3 is a direct drive motor that does not use a transmission. The generator 3 acts as a motor by supplying electric power, and also acts as a generator that converts kinetic energy of the vehicle 30 into electric power.
The generator 3 has a rotor 19 (FIG. 1) attached to the inner ring 5 (FIG. 1) which is a hub wheel, so when a current is applied to the generator 3, the inner ring 5 (FIG. 1) is rotationally driven. During power regeneration, regenerative power can be obtained by loading the induced voltage.

<About Control System of Vehicle 30>
The host ECU 40 is a unit that performs integrated control of the vehicle 30, and includes a torque command generation unit 43. The torque command generation unit 43 generates a torque command in accordance with signals of operation amounts respectively input from an accelerator operation unit 56 such as an accelerator pedal and a brake operation unit 57 such as a brake pedal. The vehicle 30 includes an internal combustion engine 35a and a motor generator 35b on the drive wheel side as the main drive source 35, and also includes two generators 3 and 3 for driving the two driven wheels 10 _B and 10 _B , respectively. The host ECU 40 is provided with torque command distribution means 44 which distributes the torque commands to the drive sources 35a, 35b, 3 and 3 in accordance with a rule.

  The torque command for the internal combustion engine 35a is transmitted to the internal combustion engine control means 47, and is used for valve opening control etc. by the internal combustion engine control means 47. A torque command to the drive wheel side generator motor 35b is transmitted to the drive wheel side motor generator control means 48 and executed. The torque command to the generators 3, 3 on the driven wheel side is transmitted to the individual control means 39, 39. The part of the torque command distribution means 44 to be output to the individual control means 39, 39 is referred to as an individual motor generator command means 45. The individual motor generator command means 45 gives the individual control means 39 a torque command as a command of a braking force with which the generator 3 shares braking by regenerative braking in response to the signal of the operation amount of the brake operation means 57. Also have. The individual motor generator command means 45 and the individual control means 39 constitute control means 68 for controlling the generator 3.

  The individual control means 39 is an inverter device, and an inverter 41 for converting DC power of the medium voltage battery 49 into three-phase AC voltage, and a control unit 42 for controlling the output of the inverter 41 by PWM control etc. Have. The inverter 41 includes a bridge circuit (not shown) such as a semiconductor switching element, and a charging circuit (not shown) for charging the regenerative power of the auxiliary power unit 3 to the medium voltage battery 49. Although the individual control means 39 is separately provided for the two generators 3 and 3, it is housed in one case, and the control unit 42 is shared by both the individual control means 39 and 39. Good.

  FIG. 8 is a power supply system diagram as an example of a vehicle equipped with the system for a vehicle shown in FIG. In the example of the figure, a low voltage battery 50 and a medium power battery 49 are provided as batteries, and both the batteries 49 and 50 are connected via a DC / DC converter 51. Although there are two generators 3, one is shown as a representative. The motor generator 35b on the drive wheel side of FIG. 7 is connected to the intermediate power system in parallel with the generator 3 on the driven wheel side, although illustration is omitted in FIG. A low voltage load 52 is connected to the low voltage system, and a medium voltage load 53 is connected to the medium voltage system. There are a plurality of low voltage loads 52 and a plurality of medium voltage loads 53, but one is representatively shown.

  The low voltage battery 50 is a battery generally used in various automobiles as a power supply of a control system or the like, and is, for example, 12 V or 24 V. The low voltage load 52 includes basic components such as a starter motor of the internal combustion engine 35a, lights, a host ECU 40, and other ECUs (not shown). The low voltage battery 50 may be referred to as an auxiliary battery for electrical equipment accessories, and the medium voltage battery 49 may be referred to as an auxiliary battery for an electric system or the like.

  The medium voltage battery 49 has a voltage higher than that of the low voltage battery 50 and lower than a high voltage battery (100 V or more, for example, about 200 to 400 V) used in a strong hybrid vehicle etc. It is a voltage that does not cause a problem, and a 48V battery used in recent years for mild hybrids is preferable. A medium voltage battery 49 such as a 48V battery can be mounted relatively easily on a vehicle equipped with a conventional internal combustion engine, and can reduce fuel consumption by power assist and regeneration with electric power as a mild hybrid.

  The medium voltage load 53 of the 48V system is the accessory part, and is a power assist motor which is the generator 3 on the drive wheel side, an electric pump, an electric power steering, a supercharger, an air compressor, or the like. By configuring the load of accessories with a 48V system, although the power assist output is lower than that of high voltage (100V or higher strong hybrid vehicles etc.), the risk of electric shock to occupants and maintenance workers can be reduced. it can. Since the insulation coating of the wire can be thinned, the weight and volume of the wire can be reduced. Further, since a large amount of power can be input / output with a current amount smaller than 12 V, the volume of the motor or generator can be reduced. From these things, it contributes to the fuel consumption reduction effect of vehicles.

  The vehicle system is suitable for accessory parts of such mild hybrid vehicles, and is applied as a power assist and a power regeneration part. Although CMGs, GMGs, and belt-driven starter motors (none of which are shown) may be employed conventionally in mild hybrid vehicles, all of them are power assists for internal combustion engines or power devices. Or because it regenerates, it is affected by the efficiency of the transmission device and speed reducer.

Since contrast to the vehicle system of this embodiment is mounted with respect to the driven wheels 10 _B, and the main drive source is disconnected such as an internal combustion engine 35a and the electric motor (not shown), the power regeneration In this case, kinetic energy of the vehicle body 1 can be used directly. In addition, when CMG, GMG, a belt drive type starter motor, etc. are mounted, they need to be incorporated in consideration from the design stage of the vehicle 30, and it is difficult to retrofit.

In contrast, the generator 3 of the vehicle system that fits the driven wheel 10 in the _B may be attached even complete vehicles in part exchange the same steps, the finished vehicle internal combustion engine 35a only Can also configure 48V system. By mounting the bearing device 1 for a wheel with a generator according to any one of the embodiments and the medium voltage battery 49 as a battery for a generator to an existing vehicle equipped with only the internal combustion engine 35a, the vehicle can be greatly reduced. It can be a mild hybrid vehicle without remodeling. Another auxiliary drive motor generator 35b may be mounted on the vehicle equipped with the vehicle system of this embodiment as shown in FIG. At that time, the power assist amount and the regenerative electric energy for the vehicle 30 can be increased, which further contributes to the fuel consumption reduction.

Figure 9 shows an example of a generator equipped wheel support bearing assembly 1, is applied respectively to the driven wheels 10 _B which is a driving wheel 10 _A and a rear wheel is a front wheel according to any of the embodiments. The drive wheel _10A is driven by the main drive source 35 comprising an internal combustion engine via the clutch 36 and the reduction gear 7. In this front-wheel drive vehicle, the support and the auxiliary drive of the drive wheels 10 _A and the driven wheels 10 _B, the generator equipped wheel support bearing assembly 1 is installed. As described above, the generator equipped wheel bearing device 1 can be applied not only to the driven wheel 10 _B but also to the driving wheel 10 _A.

  Although the system for vehicles shown in FIG. 7 has a function to generate electric power, it may be a system which does not rotate by feeding. In this case, the braking power can be generated by storing the regenerative power generated by the generator 3 in the medium voltage battery 49. The braking performance can also be improved by using it together with or using the mechanical brake operating means 57. When limited to the function of generating power as described above, the individual control means 39 can be configured as an AC / DC converter (not shown) rather than an inverter. The AC / DC converter device has a function of charging the regenerative power of the generator 3 to the medium voltage battery 49 by converting a three-phase AC voltage into a DC voltage, and the control method is easy compared to an inverter, Miniaturization is possible.

  As mentioned above, although the form for implementing this invention was demonstrated based on embodiment, embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

2 ... Wheel bearing 3 ... Generator 4 ... Outer ring (fixed ring)
5 ... Inner ring (turning wheel)
6 ... rolling element 7 ... hub flange 8 ... knuckle (vehicle body side mounting member)
12 ... brake rotor 12b ... outer peripheral portion 15 ... rotation case 18 ... stator 19 ... rotor 20 ... mounting flange 20b ... flange portion

Claims (8)

A bearing for a wheel having a fixed wheel and a hub flange, rotatably supported on the fixed wheel via a rolling element, and having a wheel and a brake rotor mounted on the hub flange, and the fixed wheel In a generator-equipped wheel bearing apparatus comprising: a stator attached; and a generator having a rotor attached to the rotating wheel,
The fixed ring has an outer ring positioned radially inward of the stator, and a mounting flange including a flange portion provided on the outer peripheral surface of the outer ring and positioned more inboard than the vehicle-side mounting member. The mounting flange is a separate body from the outer ring, and is a bearing device for a wheel with a generator that is fastened to the vehicle-side mounting member.   The generator-equipped wheel bearing apparatus according to claim 1, wherein the wheel bearing is a bearing that supports a driven wheel mechanically disconnected from a main drive source of the vehicle. .   The generator-equipped wheel bearing apparatus according to claim 1, wherein the wheel bearing is a bearing for supporting a drive wheel mechanically coupled to a main drive source of the vehicle.   The bearing device for a wheel with a generator according to any one of claims 1 to 3, wherein the generator covers the rotor and the stator, and a rotating case integrally provided on an inner ring which is the rotating wheel. A bearing device for a wheel with a generator, wherein the rotation case is fixed to the outer diameter surface of the hub flange of the inner ring, and the rotor is fixed to the inner periphery of the rotation case.   The bearing device for a wheel with a generator according to any one of claims 1 to 4, wherein the whole of the generator has a smaller diameter than an outer peripheral portion which is a portion of the brake rotor on which a brake caliper is pressed. And the generator-equipped wheel whose whole except the attachment portion to the hub flange in the generator is located in an axial range between the inboard vehicle body mounting surface of the wheel bearing and the hub flange Bearing equipment.   The bearing apparatus for a wheel with a generator according to any one of claims 1 to 5, wherein each center of double-row rolling elements in the wheel bearing is within the range of the width β in the axial direction of the stator. Generator bearing assembly located in   The bearing device for a wheel with a generator according to any one of claims 1 to 6, wherein a drive voltage or a regenerative voltage for rotational drive of the generator is 100 V or less.   A vehicle comprising the generator equipped wheel support bearing device according to any one of claims 1 to 7.

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