JP2019018707A - Wheel bearing device with power device - Google Patents

Abstract

To provide a wheel bearing device with a power device which can secure a desired volume without largely changing a constitution of a general wheel bearing and a constitution of an underbody component or the like, and can accommodate an electric generator and a reduction gear in a wheel.SOLUTION: This wheel bearing device 1 with a power device comprises a wheel bearing 2 and the power device Hd. The power device Hd is an electric generator with a reduction gear which comprises an electric generator 3 having a stator attached to an outer ring 4, and a motor rotor including a rotating shaft which is parallel with a rotating shaft of the wheel bearing 2, and a reduction gear Gk for transmitting the rotation of the motor rotor to a wheel by reducing a speed of the rotation. The power device Hd is smaller in a diameter as a whole than an external peripheral face 12b being a portion to which a brake carrier Kp in the brake rotor 12 is pressed as a whole, and the power device Hd is located as a whole within a range in an axial direction between a vehicle body attachment face of the wheel bearing 2 and a hub flange 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a wheel bearing device with a power unit capable of accommodating a generator or the like for improving vehicle performance in a wheel without greatly changing the configuration of a general wheel bearing and a suspension part such as a brake.

  As shown in FIGS. 11 to 13, a general wheel bearing includes an attachment flange 60 a provided integrally with the outer ring 60, and the attachment flange 60 a is attached to the knuckle 61. The mounting flange 60a contacts the knuckle 61 from the outside of the vehicle body (outboard side) and is fastened by the bolt 62 inserted from the knuckle 61 to the inside of the vehicle body (inboard side). Since the wheel bearing is attached by a vehicle manufacturer, good assembly is required.

  In-wheel motor structures (Patent Documents 1 and 2) in which a motor is incorporated in a wheel need to mount an inverter and a battery for operating the motor on the vehicle body, but do not need to mount a power unit in the vehicle body. For this reason, power can be applied to the vehicle without occupying the vehicle body volume, and the degree of freedom in vehicle body design is high. However, since the motor output is proportional to the motor volume, in order to obtain a large output torque, the motor is enlarged or a speed reduction mechanism is required. An in-wheel motor having a large motor volume or having a speed reduction mechanism is difficult to fit in the wheel, and a suspension device equipped with a wheel bearing similar to the conventional one cannot be used, and the structural change around the underbody of the vehicle body is avoided. I can't.

Japanese Patent No. 4694147 Japanese Patent No. 4724075

  The motor volume is small to cover the power of the vehicle body only with the in-wheel motor that fits in the wheel bearing and the brake rotor. For this reason, it is necessary to provide a speed reduction mechanism or increase the motor size in order to increase the output torque. In the structure including the speed reduction mechanism, it is particularly difficult to fit the speed reduction mechanism and the motor axial portion in the wheel. As a result, it is not possible to use a suspension device equipped with a wheel bearing similar to the conventional one, and it is inevitable to change the structure of the underbody of the vehicle body.

  On the other hand, it is conceivable to mount an in-wheel motor as a power assist system of a hybrid system using other power mechanisms such as an internal combustion engine as main power means. In this case, it is not necessary to cover the power of the vehicle body only with the in-wheel motor. By driving the in-wheel motor in accordance with the running state of the vehicle or the state of the main power means, regenerative braking and charging, fuel saving and vehicle The power performance can be improved.

  However, when a large output torque such as an improvement in acceleration performance is required, it is necessary to obtain a high output torque in a limited space. Since the output torque of the motor increases in proportion to the volume, it is necessary to use a speed reducer to obtain a large output torque with a small motor.

  An object of the present invention is to provide a power generator capable of accommodating a motor generator and a speed reducer in a wheel that can secure a desired volume without greatly changing the configuration of general wheel bearings and suspension parts. It is providing the bearing apparatus for a wheel with a wheel.

A wheel bearing device with a power unit 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 so that a wheel and a brake rotor of a vehicle are attached to the hub flange. In a wheel bearing device with a power device comprising a wheel bearing having a wheel and a power device,
The power unit includes a stator attached to the fixed wheel and a motor generator including a motor rotor including a rotation shaft parallel to a rotation shaft of the wheel bearing, and a gear mechanism that transmits rotation between the motor rotor and the wheel. A motor generator with a gear mechanism comprising
The entire power unit has a smaller diameter than an outer peripheral part of the brake rotor that is a portion to which a brake caliper is pressed, and the entire power unit includes a vehicle body mounting surface of the wheel bearing, the hub flange, Located in the axial range between.

According to this configuration, since the power unit includes a gear mechanism that transmits the rotation between the motor rotor and the wheels, a desired volume (motor volume) is ensured while reducing the size of the motor generator, and the output required as the power unit. Torque can be obtained.
Since the entire power unit is smaller in diameter than the outer periphery of the brake rotor and the entire power unit is located in the axial range between the vehicle body mounting surface of the wheel bearing and the hub flange, A space for installing the power unit can be secured and the power unit can be stored compactly.
Therefore, a power device capable of securing a desired motor volume can be accommodated in the wheel without greatly changing the configuration of general wheel bearings and suspension parts.

The gear mechanism may include an internal gear that rotates integrally with the wheel, the brake rotor, and the rotating wheel. In this case, the gear provided on the motor rotor of the motor generator and the internal gear mesh with each other directly or via another gear, so that the output of the motor generator can be reduced when the motor generator is driven.
The internal gear may be provided in the brake rotor. In this case, the internal gear can be formed using the inner peripheral surface of the brake rotor and the like.

  The motor generator may include a rotating case that covers the motor rotor and the stator and is provided integrally with the rotating wheel, and the rotating gear may be provided with the internal gear. In this case, since the speed reducer can be housed in the rotating case, the wheel bearing device with a power unit can be handled as an integral part. Therefore, the assembly | attachment property which attaches the wheel bearing apparatus with a motive power apparatus to a vehicle body side attachment member can be improved.

  You may provide the seal | sticker which seals between the outer ring | wheel which is the said fixed ring | wheel, and the said rotation case. In this case, the seal can prevent water and foreign matter from entering the motor generator and the wheel bearing.

The rotating shaft of the motor generator may be provided coaxially with the rotating shaft of the wheel bearing. In this case, it is possible to secure a larger motor volume than the configuration in which the rotating shaft of the motor generator is non-coaxial with the rotating shaft of the wheel bearing, thereby increasing the output torque.
The motor generator is provided integrally with the wheel bearing on an outer periphery of the wheel bearing, and the gear mechanism includes a planetary gear having an internal gear that rotates integrally with the wheel and a gear that meshes with the internal gear. Power may be transmitted by a mechanism. With such a planetary gear mechanism or the like, it is possible to obtain the output torque necessary for the power unit.

  The power unit may include a plurality of the motor generators. In this case, the output torque of the motor generator can be made larger than that provided with one motor generator. In addition, motor generators with characteristics such as low speed, high speed, regenerative, etc. can be arranged, and motor generators can be controlled by switching drive and regeneration control and power transmission in accordance with the respective characteristics. It can be used in areas with high efficiency.

  A rotation detector for detecting a rotation speed of the rotating wheel with respect to the fixed wheel is provided between an end of the rotating wheel opposite to the hub flange (inboard side) and the fixed wheel. Also good. In this case, the rotation detector can be used for driving or regenerative control of the motor generator.

  The drive voltage or regenerative voltage for rotational driving of the motor generator may be 100 V or less. In this case, the risk of electric shock to passengers or maintenance workers can be reduced. By mounting this wheel bearing device with a power unit and a medium voltage battery of 100 V or less as a battery for a motor generator on an existing vehicle equipped only with an internal combustion engine, the vehicle is not significantly modified, It can be a mild hybrid vehicle.

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

The fixed ring may be an outer ring of the wheel bearing, and the rotating wheel may be an inner ring of the wheel bearing.
The wheel bearing device with a power unit according to the present invention can be applied even when the rotating wheel is an outer ring. However, when the rotating wheel is an inner ring, each component can be installed in a space-efficient manner.

  The gear mechanism may be a speed reducer that reduces the rotation of the motor rotor and transmits it to the wheels.

  The gear mechanism may be a speed increasing device that increases the speed of rotation of the wheels and transmits the speed to the motor generator.

  According to this configuration, since the speed increaser that accelerates the rotation of the wheel and transmits the speed to the motor generator is provided, the motor generator can be reduced in size and a desired motor volume can be secured to obtain regenerative power. . The motor generator and the speed increaser as a whole have a smaller diameter than the outer periphery of the brake rotor, and the motor generator and the speed increaser as a whole are arranged between the vehicle body mounting surface of the wheel bearing and the hub flange. Since it is located in the direction range, a space for installing the motor generator and the speed increaser in the wheel can be secured, and the motor generator and the speed increaser can be compactly accommodated. Therefore, a motor generator and a speed increaser that can secure a desired volume (volume of the motor generator) without significantly changing the configuration of general wheel bearings and suspension parts and the like are accommodated in the wheel. Can do.

A wheel bearing device with a power unit 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 so that a wheel and a brake rotor of a vehicle are attached to the hub flange. In a wheel bearing device with a power device including a wheel bearing having a wheel and a power device, the power device has a rotating shaft parallel to a stator attached to the fixed wheel and a rotating shaft of the wheel bearing. A motor generator with a gear mechanism comprising a motor generator having a motor rotor and a gear mechanism for transmitting rotation between the motor rotor and the wheels, and the entire power unit is pressed by a brake caliper in the brake rotor And the entire power unit has a vehicle body mounting surface of the wheel bearing and the hub. Located axially range between flanges. For this reason, the motor generator and the speed reducer which can ensure a desired motor volume can be accommodated in a wheel, without changing a structure of a general wheel bearing, suspension parts, etc. largely.

It is sectional drawing of the wheel bearing apparatus with a power unit which concerns on embodiment of this invention. It is sectional drawing which expands and shows a part of bearing device for wheels with the same power device. It is a perspective view of the wheel bearing apparatus with the same power device. It is a disassembled perspective view of the wheel bearing apparatus with the same power device. It is sectional drawing which expands and shows a part of bearing device for wheels with a power unit which concerns on other embodiment of this invention. It is a disassembled perspective view of the wheel bearing apparatus with the same power device. It is a perspective view of the wheel bearing apparatus with a power unit which concerns on other embodiment of this invention. It is a block diagram which shows the conceptual structure of the system for vehicles of a vehicle provided with the bearing device for wheels with any power apparatus. It is a power supply system figure which becomes an example of the vehicle 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 device for wheels with the same power unit. It is sectional drawing, such as a wheel bearing of a prior art example. It is the side view which decomposed | disassembled the wheel bearing, the brake rotor, and the knuckle. It is the perspective view which decomposed | disassembled the wheel bearing, the brake rotor, and the knuckle.

  A wheel bearing device with a power unit according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the wheel bearing device 1 with a power device includes a wheel bearing 2 and a power device Hd.

<About wheel bearing 2>
The wheel bearing 2 includes an outer ring 4 that is a fixed ring, a double row rolling element 6, and an inner ring 5 that is a rotating wheel. An inner ring 5 is rotatably supported on the outer ring 4 via double row rolling elements 6. Grease is sealed 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 from the outer ring 4 toward the outboard side in the axial direction. As shown in FIGS. 1 and 4, a mounting flange 4 a is provided on the inboard side of the outer peripheral surface of the outer ring 4, and this mounting flange 4 a is attached to a knuckle 8 which is a vehicle body side mounting member by a fastening bolt 22. It has been.

  In this specification, the side closer to the outer side in the vehicle width direction of the vehicle when the wheel bearing device 1 with a power unit is mounted on the vehicle is referred to as the outboard side, and the side closer to the center in the vehicle width direction of the vehicle. Is called the inboard side.

  As shown in FIG. 1, a wheel rim (not shown) and a brake rotor 12 are attached to a side surface on the outboard side of the hub flange 7 with a hub bolt 13 in a state where they overlap in the axial direction. A tire is attached to the outer periphery of the rim.

<About brake 17>
The brake 17 is a friction brake including a disc-type brake rotor 12 and a brake caliper Kp. The brake rotor 12 has a flat plate-like portion 12a and an outer peripheral portion 12b. The flat plate-like portion 12 a is an annular and flat plate-like member that overlaps the hub flange 7. The outer peripheral portion 12 b extends from the flat plate-like portion 12 a to the outer peripheral side of the outer ring 4. The outer peripheral portion 12b includes a cylindrical portion 12ba extending in a cylindrical shape from the outer peripheral edge portion of the flat plate portion 12a toward the inboard side, and a flat plate portion 12bb extending in a flat plate shape from the inboard side end of the cylindrical portion 12ba toward the outer diameter side. And have.

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

<Power unit Hd>
As shown in FIGS. 2 and 3, the power unit Hd is a device that can perform drive assist, regenerative braking, and power generation in combination with the main drive source 35 (FIG. 10) for traveling. This power unit Hd is a motor generator with a reduction gear including the motor generator 3 and a reduction gear (gear mechanism) Gk.
The entire radial direction range L2 of the power unit Hd is smaller than the outer peripheral portion 12b of the brake rotor 12. Further, the entire power unit Hd is positioned in the axial range L1 between the vehicle body mounting surface of the wheel bearing 2 and the hub flange 7.

  The motor generator 3 includes a stator 18 attached to the attachment flange 4 a of the outer ring 4 and a rotor (motor rotor) 19 including a rotation axis Lb parallel to the rotation axis La of the wheel bearing 2. The motor generator 3 includes an IPM (Interior Permanent Magnet) synchronous motor (or IPMSM (Interior Permanent Magnet Synchronous Motor)), an SPM (Surface Permanent Magnet) synchronous motor (or SPMSM (Surface Permanent Magnet Synchronous Motor)), An SR (Switched reluctance) motor, a brushed DC motor, an induction motor, or the like can be selected in accordance with the required function.

  By selecting a PM motor as the motor generator 3, a motor having a larger output torque than other types of motors having the same volume can be obtained. Alternatively, by selecting an induction motor or an SR motor as the motor generator 3, a structure without a cogging torque and without drag resistance by the motor can be obtained. By selecting a brushed DC motor as the motor generator 3, electric power can be taken out without an external control circuit during regeneration.

As shown in FIGS. 2 to 4, the reduction gear Gk decelerates the rotation of the motor rotor 19 and transmits it to the wheels when the motor generator 3 is driven. The reduction gear Gk functions as a speed increaser that increases the rotation of the wheel and transmits it to the motor generator 3 when the motor generator 3 performs regenerative braking / charging.
The reduction gear Gk includes an internal gear Ig and a pinion gear Pg that is an external gear meshing with the internal gear Ig. The internal gear Ig is formed on the inner peripheral surface of the cylindrical portion 12ba of the brake rotor 12. Therefore, the internal gear Ig rotates integrally with the wheel, the brake rotor 12, and the inner ring 5. The pinion gear Pg is fixed to the rotation shaft Lb of the motor generator 3, and this pinion gear Pg is always meshed with the internal gear Ig.

<Rotation detector>
The wheel bearing device 1 with a power unit is provided with a rotation detector (not shown). As shown in FIG. 2, this rotation detector detects the rotational speed of the inner ring 5 with respect to the outer ring 4 for use in driving the motor generator 3 or regenerative control. For example, a resolver is applied as the rotation detector. The rotation detector includes, for example, a detected part (not shown) attached to the inner ring 5 that is a rotating wheel, and a sensor part that is attached to the outer ring 4 or knuckle 8 that is a fixed ring and detects the detected part. (Not shown). As a rotation detector, you may employ | adopt optical detectors, such as magnetic detectors, such as a magnetic encoder, a laser, or infrared rays, for example.

<Effect>
According to the wheel bearing device with a power unit 1 described above, the power unit Hd includes the speed reducer Gk that decelerates the rotation of the motor rotor 19 and transmits it to the wheel, so that the motor generator 3 can be reduced in size and desired. The output torque required for the power unit Hd can be obtained by securing the volume (motor volume).
The entire radial range L2 of the power plant Hd is smaller than the outer peripheral portion 12b of the brake rotor 12, and the entire power plant Hd is located between the vehicle body mounting surface of the wheel bearing 2 and the hub flange 7. Since it is located in the axial range L1, a space for installing the power unit Hd in the wheel can be secured and the power unit Hd can be stored compactly.
Therefore, the power unit Hd capable of securing a desired motor volume can be accommodated in the wheel without largely changing the configuration of a general wheel bearing and suspension part.
Since the motor generator 3 is mounted on the outer diameter portion of the wheel bearing 2, a drive shaft (not shown) as a power transmission member can be inserted through the center of the rotation shaft of the wheel bearing 2.

<About other embodiments>
In the following description, the same reference numerals are given to portions corresponding to the matters described in advance in the respective embodiments, and overlapping descriptions are omitted. When only a part of the configuration is described, the other parts of the configuration are the same as those described in advance unless otherwise specified. The same effect is obtained from the same configuration. Not only the combination of the parts specifically described in each embodiment, but also the embodiments can be partially combined as long as the combination does not hinder.

  As shown in FIGS. 5 and 6, the power unit Hd may be configured to include an outer rotor type motor generator 3 and a planetary gear mechanism Yk. The motor generator 3 is an outer rotor motor in which the motor rotor 19 is located radially outward of the stator 18. The motor generator 3 includes a rotating case 15, a stator 18, and a motor rotor 19. The rotating case 15 covers the motor rotor 19 and the stator 18 and is provided integrally with the inner ring 5.

  The rotating case 15 includes a cylindrical case cylindrical portion having a step portion in the middle in the axial direction. The case cylindrical portion includes a small diameter portion on the outboard side, a large diameter portion on the inboard side, and a small diameter portion. The step portion connecting the large diameter portion is provided. The inner peripheral surface of the small diameter portion of the case cylindrical portion is fixed to the outer diameter surface of the hub flange 7 of the inner ring 5.

  The rotating shaft of the motor generator 3 is coaxial with the rotating shaft La of the wheel bearing 2. A motor generator 3 is provided integrally with the wheel bearing 2 on the outer periphery of the wheel bearing 2. A stator 18 and bearings Br and Br are fixed to the outer peripheral surface of the outer ring 4. The bearings Br and Br are disposed on the inboard side and the outboard side of the stator 18, and the inner ring inner peripheral surface of each bearing Br is fitted and fixed to the outer peripheral surface of the outer ring 4. An external gear Og integrated with the motor rotor 19 is installed over the outer ring outer peripheral surface of the bearings Br and Br. Therefore, the external gear Og is rotatably supported by the outer ring 4 that is a fixed ring via the bearings Br and Br. A motor rotor 19 is fixed to the inner peripheral surface of the external gear Og, and the motor rotor 19 faces the outer side of the stator 18 in the radial direction with a predetermined radial gap therebetween.

<Planetary gear mechanism Yk, etc.>
The planetary gear mechanism Yk, which is a reduction gear, includes an internal gear Ig, a planetary gear Gy, a planet carrier Ky, and the external gear Og. An internal gear Ig is formed on the inner peripheral surface of the large-diameter portion of the case cylindrical portion, and the internal gear Ig meshes with the planetary gear Gy. Further, the planetary gear Gy meshes with the external gear Og. The outer ring 4 that is a fixed ring is provided with a fixing member 24 that supports a plurality of planet carriers Ky. A plurality of planet carriers Ky are arranged on the concentric circle of the wheel bearing 2 at regular intervals in the circumferential direction. Each planet carrier Ky holds a planetary gear Gy so as to be able to rotate. Power can be transmitted by such a planetary gear mechanism Yk.

<Assembly structure of wheel bearing device to knuckle 8>
The outer ring 4 is provided with a mounting flange 20 and a pull-in nut 21 for fixing the wheel bearing device to the knuckle 8. The mounting flange 20 has a cylindrical portion and a flange portion. The cylindrical portion is disposed so that one end in the axial direction is in contact with a step portion on the outer peripheral surface of the outer ring 4, and the flange portion extends radially outward from the other axial end of the cylindrical portion. The flange portion is located on the inboard side with respect to the knuckle 8. The mounting flange 20 is fixed to the outer ring 4 by bringing the flange portion into contact with the inboard side surface of the knuckle 8 and tightening the pull-in nut 21.

  The flange portion is provided with insertion holes 20c through which a plurality of fastening bolts (fastening means) 22 are inserted. A plurality of female screws (not shown) to which a plurality of fastening bolts 22 are screwed are formed on the fixing member 24 at regular intervals in the circumferential direction. The plurality of female screws are formed so as to match the phases of the plurality of insertion holes 20 c of the mounting flange 20. The knuckle 8 is formed with a through hole 8a that allows the outer peripheral surface of the cylindrical portion of the mounting flange 20 to be inserted, and a plurality of communication holes 8b that match the phase of the plurality of insertion holes 20c. 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 into the female threads of the fixing member 24 through the communication holes 8 b of the knuckle 8. . With these fastening bolts 22, the fixing member 24, the knuckle 8, and the mounting flange 20 are fastened together.

<About seal structure>
An annular seal 23 that prevents water and foreign matter from entering the motor generator 3 and the wheel bearing 2 is fitted to the outer peripheral edge of the fixing member 24. The seal 23 includes an inner cylindrical portion and an outer cylindrical portion that are provided at a predetermined distance in the radial direction, and a standing plate portion that connects the cylindrical portions. The 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 fixing member 24, and the standing plate portion is closely provided on the side of the outboard of the knuckle 8. Further, a lip that protrudes a predetermined small distance radially outward is provided on the outer peripheral surface of the outer cylindrical portion, and this lip is in sliding contact with the inner peripheral surface of the case cylindrical portion.

<Rotation detector 26 and cover 27>
The rotation detector 26 detects the rotation speed of the inner ring 5 with respect to the outer ring 4. As the rotation detector 26, for example, any one of a magnetic detector such as a resolver and a magnetic encoder, and an optical detector such as a laser or an infrared ray is applied. The rotation detector 26 includes a detected portion 26a attached to the outer peripheral surface of the inner ring 5, and a sensor portion 26b attached to the inner peripheral surface of the outer ring 4 to detect the detected portion 26a.

  A cover 27 is provided on the vehicle body side end face of the wheel bearing 2. The cover 27 has a bottomed cylindrical shape, and has a cylindrical portion that is fitted and fixed to the inner peripheral surface of the outer ring 4 on the inboard side, and a bottom portion that closes the inboard side end of the cylindrical portion. The cover 27 prevents water and foreign matter from entering the rotation detector 26 and the wheel bearing.

  According to the configuration shown in FIG. 5 and FIG. 6 described above, the planetary gear mechanism Yk can be housed in the rotating case 15, so that the wheel bearing device with a power unit can be handled as an integral part. Therefore, the assembly | attachment property which attaches the wheel bearing apparatus with a motive power device to the knuckle 8 can be improved. In addition, since the rotation shaft of the motor generator 3 is provided coaxially with the rotation axis La of the wheel bearing 2, the rotation shaft of the motor generator 3 is not coaxial with the rotation axis La of the wheel bearing 2. However, it is possible to secure a large motor volume, thereby increasing the output torque.

  As shown in FIG. 7, the power unit may have a configuration in which a plurality (three in this example) of motor generators 3 are mounted. In this configuration, each motor generator 3 is attached to the attachment flange 4 a of the outer ring 4. The plurality of motor generators 3 are provided at intervals in the circumferential direction. The rotation axis of the motor rotor of each motor generator 3 is parallel to the rotation axis of the wheel bearing 2. The pinion gears Pg fixed to the rotation shafts of the motor generators 3 always mesh with the internal gears Ig. Other configurations are the same as those shown in FIGS.

  According to the configuration of FIG. 7, it is possible to increase the output torque of the entire motor generator as compared with the one provided with one motor generator. When the rotating shaft of the motor generator is non-coaxial with the rotating shaft of the wheel bearing, the space for arranging the motor generator is small, and the output of the motor generator is small. However, as shown in FIG. 7, the output torque of the entire motor generator can be increased by mounting a plurality of motor generators 3. Further, each motor generator 3 is provided with a motor shut-off structure such as an electromagnetic clutch, a one-way clutch, etc., not shown, so that the motor generator 3 having characteristics such as for low speed, for high speed, and for regeneration is disposed. It is possible to use the motor generator 3 in a region where the efficiency of the motor generator 3 is high by switching the drive and regeneration control and the power transmission in accordance with the respective characteristics.

<Vehicle system>
FIG. 8: is a block diagram which shows the conceptual structure of the system for vehicles using the wheel bearing apparatus 1 with a power device which concerns on either embodiment.
In the vehicle system, the power equipped wheel support bearing device 1, in a vehicle having a driven wheel 10 _B is a main drive source mechanically unconnected, is mounted against the driven wheel 10 _B. Wheel bearing 2 in the power plant equipped wheel support bearing assembly 1 (Fig. 1, etc.) 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, a motor generator (electric motor), or a hybrid drive source that combines both. The “motor generator” refers to an electric motor capable of generating electricity by applying rotation. In the illustrated example, the vehicle 30 is a front wheel drive vehicle in which the front wheels are drive wheels 10 _A and the 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. This is a hybrid vehicle (hereinafter sometimes referred to as “HEV”).

Specifically, it is a mild hybrid type in which the motor generator 35b on the drive wheel side is driven at a medium voltage such as 48V. Hybrids are broadly divided into strong hybrids and mild hybrids. Mild hybrids are the main drive source that is an internal combustion engine, and it is a type that mainly assists driving with a motor when starting or accelerating. The (electric vehicle) mode is distinguished from a strong hybrid by being able to perform normal driving for a while but not 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.

System for a vehicle includes a motor generator 3 for drive assistance for rotating driving of the driven wheels 10 _B, the individual control means 39 for controlling the motor-generator 3, the individual control unit provided in the upper ECU40 And an individual motor generator command means 45 for outputting a command for causing the motor 39 to control driving and regeneration. The motor generator 3 is connected to power storage means. As this power storage means, a battery (storage battery), a capacitor, a capacitor, or the like can be used. The type and the mounting position on the vehicle 30 are not limited, but in this embodiment, the low voltage battery 50 mounted on the vehicle 30 and The medium voltage battery 49 is the medium voltage battery 49.

The motor generator 3 for the driven wheel functions as a motor by supplying electric power, and also functions as a generator that converts the kinetic energy of the vehicle 30 into electric power.
When a current is applied to the motor generator 3, the motor generator 3 is driven to rotate the inner ring 5 (FIG. 1, etc.) via the speed reducer Gk. On the other hand, regenerative power is obtained by loading an induced voltage during power regeneration. It is done.

<About the control system of the 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 generating means 43 generates a torque command in accordance with operation amount signals respectively inputted from an accelerator operating means 56 such as an accelerator pedal and a brake operating means 57 such as a brake pedal. The vehicle 30 includes a motor generator 35b of the internal combustion engine 35a and the drive wheel as the main drive source 35, and because with a two motor generator 3, 3 for driving two driven wheels ₁₀ B, 10 _B, respectively The host ECU 40 is provided with torque command distribution means 44 that distributes the torque command according to the rules determined for the drive sources 35a, 35b, 3, and 3.

  A torque command for the internal combustion engine 35 a is transmitted to the internal combustion engine control means 47 and used for valve opening control by the internal combustion engine control means 47. The torque command for the drive wheel side generator motor 35b is transmitted to the drive wheel side motor generator control means 48 and executed. Torque commands for the motor generators 3, 3 on the driven wheel side are transmitted to the individual control means 39, 39. A portion of the torque command distribution means 44 that outputs to the individual control means 39, 39 is referred to as an individual motor generator command means 45. This individual motor generator command means 45 gives to the individual control means 39 a torque command that serves as a braking force command for the motor generator 3 to share braking by regenerative braking in response to the operation amount signal of the brake operation means 57. It also has functions. The individual motor generator command means 45 and the individual control means 39 constitute a control means 68 for controlling the motor generator 3.

  The individual control means 39 is an inverter device, an inverter 41 that converts DC power of the medium voltage battery 49 into a three-phase AC voltage, and a control unit 42 that controls the output of the inverter 41 by PWM control or the like according to the torque command or the like Have Inverter 41 includes a bridge circuit (not shown) using a semiconductor switching element and the like, and a charging circuit (not shown) for charging regenerative power of power unit Hd (FIG. 1) to medium voltage battery 49. The individual control means 39 is provided individually for the two motor generators 3 and 3, but is housed in one housing, and the control unit 42 is shared by both the individual control means 39 and 39. Also good.

  FIG. 9 is a power supply system diagram as an example of a vehicle on which the vehicle system shown in FIG. 8 is mounted. 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. There are two motor generators 3, but one is shown as a representative. Although not shown in FIG. 9, the motor generator 35b on the driving wheel side in FIG. 8 is connected to the middle power system in parallel with the motor generator 3 on the driven wheel side. 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 medium-voltage loads 53, but one is representatively shown.

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

  The medium voltage battery 49 is higher in voltage than 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 or the like. A 48V battery that has a voltage that does not cause a problem and has recently been used in mild hybrids is preferable. The 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 as a mild hybrid, fuel efficiency can be reduced by power assist or regeneration using electric power.

  The medium voltage load 53 of the 48V system is the accessory part, such as a power assist motor, an electric pump, an electric power steering, a supercharger, and an air compressor, which are the motor generator 35b on the driving wheel side. By configuring the load by the accessories with a 48V system, the output of power assist is lower than that of high voltage (such as a strong hybrid vehicle of 100V or more), but the risk of electric shock to passengers and maintenance workers can be reduced. it can. Since the insulating coating of the electric wire can be thinned, the weight and volume of the electric wire can be reduced. In addition, since a large amount of electric power can be input and output with a current amount smaller than 12 V, the volume of the motor or motor generator can be reduced. From these things, it contributes to the fuel consumption reduction effect of a vehicle.

  This vehicle system is suitable as an accessory part of such a mild hybrid vehicle, and is applied as a power assist and power regeneration part. Conventionally, in mild hybrid vehicles, CMG, GMG, belt-driven starter motors (none of which are shown) may be employed, and these are all power assists for the internal combustion engine or the power unit. Or, since it is regenerated, it is affected by the efficiency of the transmission device and the 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 some cases, the kinetic energy of the vehicle body can be used directly. In addition, when mounting a CMG, GMG, belt-driven starter motor, or the like, it is necessary to incorporate it from the design stage of the vehicle 30, and it is difficult to retrofit.

In contrast, motor generator 3 of the system for this vehicle to fit in the driven wheel 10 in the _B may be attached even complete vehicles in part exchange the same steps, to complete vehicle internal combustion engine 35a only Even a 48V system can be constructed. By mounting the wheel bearing device with a power unit 1 according to any of the embodiments and the medium voltage battery 49 as a battery for a motor generator on an existing vehicle including only the internal combustion engine 35a, It can be made into a mild hybrid vehicle without any remodeling. Another auxiliary drive motor generator 35b may be mounted on the vehicle on which the vehicle system of this embodiment is mounted, as in the example of FIG. At that time, the power assist amount and the regenerative power amount for the vehicle 30 can be increased, which further contributes to reduction of fuel consumption.

Figure 10 shows an example in which a power unit equipped wheel support bearing device 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 through a clutch 36 and a speed reducer 7 by a main drive source 35 comprising an internal combustion engine. In this front-wheel drive vehicle, the support and the auxiliary drive of the drive wheels 10 _A and the driven wheels 10 _B, power equipped wheel support bearing assembly 1 is disposed. Thus the power unit equipped wheel support bearing device 1, not only the driven wheels 10 _B, can also be applied to the drive wheels 10 _A.

  The vehicle system shown in FIG. 8 has a function of generating power, but may be a system that does not rotate by power feeding. In this case, it replaces with a power plant provided with a motor generator and a reduction gear, and a power generator and a speed up gear which transmits rotation of a wheel to the power generator are applied. The generator has the same configuration as any of the motor generators described above, and the speed increaser has the same configuration as the speed reducer provided corresponding to any of the motor generators. In this case, a braking force can be generated by storing the regenerative power generated by the generator 3 in the medium voltage battery 49. The braking performance can be improved by using together with or using the mechanical brake operating means 57.

  Thus, when it restricts to the function to generate electric power, the individual control means 39 can be comprised not as an inverter apparatus but as an AC / DC converter apparatus (not shown). 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 to a DC voltage, and the control method is easier than an inverter. Miniaturization is possible.

  The structure for fixing the mounting flange 20 to the outer ring 4 is not limited to the nut tightening using the lead-in nut 21. 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 by fitting the inner peripheral surface of the mounting flange 20 to the outer peripheral surface of the outer ring 4 and press-fitting, nut fastening, caulking, welding, You may fix by either adhesion | attachment etc.

  The wheel bearing according to the embodiment is a so-called third generation hub bearing in which an outer ring that is a fixed ring has a connection hole with a knuckle and an inner ring that is a rotating ring has a hub flange. It is not limited. For example, a so-called second generation hub bearing in which an outer ring having a double row rolling surface and a knuckle attachment member are formed as separate members may be used. A so-called first generation hub bearing may be used in which the inner ring and the hub flange are formed of separate members.

  As mentioned above, although the form for implementing this invention based on embodiment was demonstrated, embodiment disclosed this time is an illustration and restrictive at no points. 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 ... Wheel bearing apparatus with a power unit 2 ... Wheel bearing 3 ... Motor generator 4 ... Outer ring (fixed ring)
5 ... Inner ring (rotating wheel)
6 ... rolling elements 7 ... hub flange 10 A _... drive wheels 10 B _... driven wheel 12 ... brake rotor 15 ... rotary case 18 ... stator 19 ... rotor (rotor)
23 ... Seal 26 ... Rotation detector Gk ... Reducer (gear mechanism)
Gy ... Planetary gear Hd ... Power unit Ig ... Internal gear Kp ... Brake caliper Og ... External gear Pg ... Pinion gear Yk ... Planetary gear mechanism

Claims (15)

A wheel bearing having a fixed wheel and a hub flange, the wheel bearing having a rotating wheel that is rotatably supported by the fixed wheel via a rolling element and on which a wheel of a vehicle and a brake rotor are mounted. In the wheel bearing device with a power unit provided,
The power unit includes a stator attached to the fixed wheel and a motor generator including a motor rotor including a rotation shaft parallel to a rotation shaft of the wheel bearing, and a gear mechanism that transmits rotation between the motor rotor and the wheel. A motor generator with a gear mechanism comprising
The entire power unit has a smaller diameter than an outer peripheral part of the brake rotor that is a portion to which a brake caliper is pressed, and the entire power unit includes a vehicle body mounting surface of the wheel bearing, the hub flange, Wheel bearing device with power unit located in the axial range between.   The wheel bearing device with a power unit according to claim 1, wherein the gear mechanism includes an internal gear that rotates integrally with the wheel, the brake rotor, and the rotating wheel.   The wheel bearing device with a power unit according to claim 2, wherein the internal gear is provided in the brake rotor.   3. The wheel bearing device with a power unit according to claim 2, wherein the motor generator includes a rotation case that covers the motor rotor and the stator and is provided integrally with the rotating wheel, and the internal gear is provided in the rotation case. A wheel bearing device with a power unit.   5. The wheel bearing device with a power unit according to claim 4, further comprising a seal that seals between the outer ring that is the fixed wheel and the rotating case. 6.   The wheel bearing device with a power unit according to any one of claims 1 to 5, wherein the motor generator has a rotating shaft coaxially with the rotating shaft of the wheel bearing. Wheel bearing device.   7. The wheel bearing device with a power unit according to claim 6, wherein the motor generator is provided integrally with the wheel bearing on an outer periphery of the wheel bearing, and the gear mechanism rotates integrally with the wheel. A wheel bearing device with a power unit that transmits power by a planetary gear mechanism having an internal gear and a gear meshing with the internal gear.   The wheel bearing device with a power unit according to any one of claims 1 to 5, wherein the power unit includes a plurality of the motor generators.   The wheel bearing device with a power unit according to any one of claims 1 to 8, wherein a rotation detector that detects a rotation speed of the rotating wheel with respect to the fixed wheel includes the hub flange of the rotating wheel, Is a wheel bearing device with a power unit provided between the opposite end and the fixed wheel.   The wheel bearing device with a power unit according to any one of claims 1 to 9, wherein a driving voltage or a regenerative voltage for rotating the motor generator is 100 V or less. .   The wheel bearing device with a power unit according to any one of claims 1 to 10, wherein the wheel bearing supports a driven wheel that is mechanically disconnected from a main drive source of the vehicle. A wheel bearing device with a power unit.   The wheel bearing device with a power unit according to any one of claims 1 to 10, wherein the wheel bearing is a bearing that supports a drive wheel mechanically connected to a main drive source of the vehicle. A wheel bearing device with a power unit.   The wheel bearing device with a power unit according to any one of claims 1 to 12, wherein the fixed ring is an outer ring of the wheel bearing, and the rotating wheel is an inner ring of the wheel bearing. Wheel bearing device with device.   14. The wheel bearing device with a power unit according to claim 1, wherein the gear mechanism is a speed reducer that decelerates and transmits the rotation of the motor rotor to the wheel. Bearing device. 14. The wheel bearing device with a power unit according to claim 1, wherein the gear mechanism is a speed increasing device that accelerates the rotation of the wheel and transmits the speed to the motor generator. Wheel bearing device with device.

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