JP2013248957A - Processing device at abnormality of in-wheel motor drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a processing device at abnormality of an in-wheel motor drive device, which releases braking force produced in a wheel by a failure etc. of the in-wheel motor drive device, and which enables running afterward.SOLUTION: In a processing device at abnormality of an in-wheel motor drive device which performs processing at abnormality of the in-wheel motor drive device including a motor 6 and a bearing 4 for a wheel, a bearing 2 for abnormality time for rotatably supporting a wheel 5A is provided separately from a bearing 4 for a wheel to be attached and detached to/from the inner member 8 of the bearing 4 for a wheel. At abnormality of the in-wheel motor drive device such as the failure of a function of the motor 6, by stopping the vehicle, by providing the bearing 2 for abnormal time for rotatably supporting the wheel 5A in the inner member 8 to be attachable and detachable, and by making the wheel 5A be freely rotated, vehicle running afterward is enabled.

Description

  The present invention relates to an abnormality processing device for an in-wheel motor drive device, and relates to a technique for releasing a braking force generated on a wheel due to a failure of the in-wheel motor drive device and enabling subsequent vehicle travel.

In an electric vehicle driven by an in-wheel motor, when either one of the left and right drive wheels is locked, a technique for stabilizing the behavior of the vehicle by locking the drive wheels on the opposite side is also proposed. (Patent Document 1).
In addition, in an in-wheel motor type vehicle, there is a technology in which a weakest part is provided in a part of a power transmission system from a motor to a wheel in order to prevent an excessive torque from being input to the motor side from the wheel side. . When a torsional torque exceeding a certain level is generated in the weakest part, the weakest part is broken (Patent Document 1). This technology can also prevent the wheels from becoming unrotatable when a motor, a bearing, a speed reducer, or the like is stuck inside the motor unit.

Japanese Patent No. 4450201 Japanese Patent No. 4877296

Although the technique of patent document 1 is one method of performing an emergency stop safely when a wheel locks, the subsequent driving | running | working is impossible. In order to prevent the wheel from being locked, as in Patent Document 2, it is possible to provide the weakest part in the power transmission part between the motor and the wheel, and to insulate the wheel and the motor by breaking the weakest part when abnormal. . However, it is difficult to set the strength of the weakest part, and there is a problem that the weakest part breaks during normal running or does not break when necessary.
By the way, when the drive wheels of an electric vehicle are locked, the electric vehicle is moved to the end of the road so that it does not interfere with other vehicles, or to the place where the tow truck can stand by while ensuring the safety of the vehicle. It is important to run.

  An object of the present invention is to provide an abnormality processing device for an in-wheel motor drive device that releases braking force generated on a wheel due to a failure of the in-wheel motor drive device or the like and enables subsequent running.

An abnormality processing device for an in-wheel motor drive device according to a first aspect of the present invention is an abnormality processing device that performs processing when an abnormality occurs in an in-wheel motor drive device having a motor and a wheel bearing,
In addition to the wheel bearing, a bearing for an abnormal time that rotatably supports the wheel is detachably provided on the rotating wheel of the wheel bearing.

  When the in-wheel motor drive device is normal (normal time), the driving force from the motor is transmitted to the rotating wheel of the wheel bearing, and the vehicle can be driven by rotating the wheel. When the in-wheel motor drive device is abnormal, such as when the function of the motor is lost, braking force is generated on the wheels. In this case, the vehicle is stopped, and an abnormal bearing that rotatably supports the wheel is detachably provided on the rotating wheel of the wheel bearing separately from the wheel bearing. Thus, regardless of the malfunction of the motor, etc., by allowing the wheels to freely rotate, it is possible to drive the vehicle thereafter, and to drive to a repair shop or the like by itself. Also, when the in-wheel motor drive device is abnormal, the wheels can be freely rotated using the bearing for the abnormal time, so that this vehicle can be brought to the end of the road so as not to obstruct other vehicles. In the meantime, you can drive to the place where you can stand by the tow truck while ensuring the safety of your car.

  The wheel supported by the abnormal bearing may be one in which a normal wheel is removed from the rotating wheel and is fixed to the abnormal bearing in place of the normal wheel. In this case, the work efficiency can be improved by exchanging the wheel itself in which the braking force is generated.

The abnormal bearing may be one that removes a normal wheel from the rotating wheel and fixes the removed wheel. In this case, the wheel in which the braking force is generated can be used as it is, and the wheel can be freely rotated. Therefore, it is possible to reduce the storage space of the abnormality processing device in the vehicle as much as possible and to improve the versatility of the abnormality processing device.
The abnormal bearing includes an inner member fixed to the rotating wheel, an outer member having a flange to which a wheel removed from the rotating wheel can be mounted, and the inner member and the raceway surface of the outer member. It may have a plurality of rolling elements interposed therebetween.

An abnormality processing device for an in-wheel motor driving device according to a second aspect of the present invention is an abnormality processing device that performs processing when an abnormality occurs in an in-wheel motor driving device having a motor and a wheel bearing. It is provided with a carriage that is detachably attached to support the wheel.
At the normal time of this in-wheel motor drive device, the driving force from the motor is transmitted to the rotating wheel of the wheel bearing, thereby allowing the vehicle to travel. When the in-wheel motor drive device is abnormal, such as when the function of the motor is lost, braking force is generated on the wheels. In this case, the vehicle is stopped, and a carriage that supports the wheel is detachably attached to the wheel. Even when a braking force is generated on the wheels as described above, the vehicle can subsequently travel through the carriage and can travel to a repair shop or the like on its own.

  And a detecting means for detecting an abnormality of the in-wheel motor driving device, and an abnormality reporting means for outputting a warning to the driver when the detecting means detects that the in-wheel motor driving device is abnormal. Also good. According to this configuration, when the vehicle is traveling, the detection means always detects an abnormality of the in-wheel motor drive device. For example, when it is determined that the difference between the rotational speeds of the front and rear or left and right vehicles is greater than a predetermined threshold, the in-wheel motor drive device for the wheel having a low rotational speed is estimated to be abnormal. The “threshold value” is appropriately determined by an actual vehicle test, simulation, or the like when a function of an arbitrary motor is lost. When the in-wheel motor driving device detects an abnormality, the abnormality reporting means outputs to the driver that the corresponding in-wheel motor driving device is abnormal, using an alarm sound or a display screen. In this way, attention is urged to perform processing when an in-wheel motor drive device having a problem is abnormal.

  When the in-wheel motor drive device is detected as abnormal by the detecting means, it may have an output limiting means for limiting the output of the motor. In this case, when the in-wheel motor drive device is abnormal during traveling of the vehicle, the output restricting means automatically restricts the output of the motor, so that unstable behavior of the vehicle can be suppressed.

The abnormality processing device of the in-wheel motor drive device has a traveling mode switching means capable of switching between a normal traveling mode and a temporary traveling mode, and after the abnormality processing by the abnormality processing device is performed, the traveling mode switching means Thus, the normal travel mode may be switched to the temporary travel mode.
The “temporary running mode” refers to a mode in which the speed and the amount of steering operation are limited and the vehicle can run at a low speed.

  An abnormality processing device for an in-wheel motor driving device according to a first aspect of the present invention is an abnormality processing device that performs processing when an abnormality occurs in an in-wheel motor driving device having a motor and a wheel bearing. Separately from the bearing, a bearing for abnormal conditions that supports the wheel rotatably is detachably attached to the rotating wheel of the wheel bearing, so that the braking force generated on the wheel due to a malfunction of the in-wheel motor drive device is released. Then, it is possible to enable subsequent travel.

  An abnormality processing device for an in-wheel motor driving device according to a second aspect of the present invention is an abnormality processing device that performs processing when an abnormality occurs in an in-wheel motor driving device having a motor and a wheel bearing. Since the carriage that is detachably attached and supports the wheel is provided, the braking force generated on the wheel due to the malfunction of the in-wheel motor drive device or the like can be released, and the subsequent traveling can be enabled.

It is sectional drawing of the processing apparatus at the time of abnormality of the in-wheel motor drive device which concerns on 1st Embodiment of this invention. It is sectional drawing of the same in-wheel motor drive device in the normal time. It is sectional drawing of the processing apparatus at the time of abnormality of the in-wheel motor drive device which concerns on other embodiment of this invention. It is sectional drawing of the same in-wheel motor drive device in the normal time. It is a front view of the abnormality processing apparatus of the in-wheel motor drive device which concerns on further another embodiment of this invention. It is a block diagram of the control system of the abnormality processing apparatus of any in-wheel motor drive device.

A first embodiment of the present invention will be described with reference to FIGS.
The abnormality processing device for an in-wheel motor drive device according to this embodiment performs processing when the in-wheel motor drive device is abnormal, and is mounted on, for example, an electric vehicle. The left and right front wheels or the left and right rear wheels are configured to be capable of traveling by independent in-wheel motor drive devices. In an electric vehicle, the front, rear, left and right four wheels may be driven by independent in-wheel motor driving devices.
First, an in-wheel motor drive device will be described.

  As shown in FIG. 2, the in-wheel motor drive device includes a motor unit 1 and a wheel bearing 4. The motor unit 1 includes a motor 6 that drives the wheel 5 and a speed reducer 7 that decelerates the rotation of the motor 6. The rotating wheel 8 of the wheel bearing 4 and the output shaft (not shown) of the motor unit 1 are arranged coaxially, and the driving force from the motor unit 1 is transmitted to the rotating wheel 8. In this specification, the side closer to the outside in the vehicle width direction of the vehicle with the in-wheel motor drive device attached to the vehicle is called the outboard side, and the side closer to the center of the vehicle is called the inboard side. .

  The motor 6 is an IPM motor (that is, an embedded magnet type synchronous motor) in which a gap is provided between a motor stator (not shown) fixed to a cylindrical motor housing 9 and a motor rotor (not shown) attached to the motor rotation shaft. is there. The in-wheel motor drive device is fixed to the vehicle body via a suspension device (not shown) such as a knuckle on the outer peripheral portion of the motor housing 9, for example. The motor housing 9 is provided with bearings that are separated from each other in the axial direction, and a motor rotating shaft is rotatably supported by these bearings. This motor rotation shaft transmits the driving force of the motor 6 to the speed reducer 7.

  As the reduction gear 7, for example, a cycloid reduction gear having a reduction ratio of 1/6 or more is applied. An input shaft (not shown) of the speed reducer 7 has one end in the axial direction extending into the motor rotation shaft, and is spline-fitted with the motor rotation shaft, for example. Therefore, the input shaft and the motor rotation shaft of the speed reducer 7 are supported by the bearing so as to be rotatable together.

  The wheel bearing 4 includes an outer member 10 that is a fixed ring having a double-row raceway surface formed on the inner periphery, and an inner member that is a rotating wheel 8 having a raceway surface facing each of the raceway surfaces on the outer periphery. The outer member 10 and the inner member 8 have double row rolling elements 11 interposed between the raceway surfaces. The inward member 8 also serves as a hub for mounting the drive wheel. The wheel bearing 4 is a double-row angular ball bearing, and the rolling elements 11 are formed of balls, and are held by a cage (not shown) for each row. The raceway surface has an arc shape in cross section, and each raceway surface is formed such that the contact angle is aligned with the back surface. Further, the outboard side end and the inboard side end of the bearing space between the outer member 10 and the inner member 8 are respectively sealed by seal members 12.

The outer member 10 is attached to the outboard side of the housing 9, and the outer member 10 and the housing 9 are an integral part.
A hub flange 15 for attaching a wheel is provided at the end of the inner member 8 on the outboard side. Hub bolts 19 are provided in a plurality of bolt holes of the hub flange 15, and the wheels of the wheels 5 are fixed by the hub bolts 19.

The abnormality processing apparatus will be described.
As shown in FIG. 1, the abnormality processing apparatus is provided with an abnormal bearing 2 that rotatably supports a wheel 5 </ b> A so as to be detachable from an inner member 8 of the wheel bearing 4. The normal wheel 5 (FIG. 2) is removed from the hub flange 15 of the inner member 8, and the wheel 5 </ b> A used in an abnormal state is fixed to the bearing 2 in place of the normal wheel 5. That is, when the in-wheel motor drive device is abnormal, such as when the function of the motor 6 is lost, a braking force is generated on the wheel 5, so the wheel 5 </ b> A used in the event of abnormality is supported on the hub flange 15 via the bearing 2.

The abnormal bearing 2 includes an inner member 3, an outer member 13, and a plurality of rolling elements 14.
The inner member 3 is formed in a substantially disk shape, the inboard side end surface of the inner member 3 is in contact with the end surface on the outboard side of the hub flange 15, and the inner peripheral surface 3 a of the inner member 3 is It is fitted to a guide 16 with the wheel. The inner member 3 is provided with through holes 3b communicating with the plurality of bolt holes of the hub flange 15 in a state where the inner member 3 is fitted to the hub flange 15 as described above. The inner member 3 is fixed to the hub flange 15 by inserting the hub bolt 19 into each bolt hole and the through hole 3b and screwing the nut 17 into a portion protruding from the end face of the inner member 3 on the outboard side. The

  For example, a double-row track surface is formed on the outer peripheral surface of the inner member 3. The outer member 13 is integrally provided on the inner peripheral portion of the wheel of the wheel 5 </ b> A used in the event of an abnormality. A double-row raceway surface is formed on the inner peripheral surface of the outer member 13. Double-row rolling elements 14 are interposed between the raceway surfaces of the inner member 3 and the outer member 13. The bearing 2 is a double-row angular ball bearing, and the rolling elements 14 are balls. Each track surface is formed so that the contact angle is aligned with the back surface.

The effect will be described.
When the in-wheel motor drive device is normal, the driving force from the motor 6 is transmitted to the inward member 8 of the wheel bearing 4 as shown in FIG. . When the in-wheel motor drive device is abnormal, such as when the function of the motor 6 is lost, braking force is generated on the wheels 5. In this case, the vehicle is stopped, and the inner member 3 of the bearing 2 that rotatably supports the wheels 5A as shown in FIG. In this way, regardless of the malfunction of the motor 6 or the like, the wheels 5A can be freely rotated, so that the subsequent vehicle can be driven, and the vehicle can be driven by itself or towed to a repair shop or the like. it can. In addition, when the in-wheel motor drive device is abnormal, the wheel 5A can be freely rotated by using the abnormal bearing 2, so that this vehicle is placed at the end of the road so as not to obstruct other vehicles. You can drive to a place where you can stand by a tow truck while keeping your vehicle safe.
The normal wheel 5 is removed from the hub flange 15, and instead of the normal wheel 5, the wheel 5A used in the event of an abnormality is fixed to the bearing 2 for the event of an abnormality. By exchanging, work efficiency can be improved.

Another embodiment will be described.
In the following description, the same reference numerals are given to the portions corresponding to the matters described in the preceding forms in each embodiment, and the overlapping description is 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.

  FIG. 3 is a cross-sectional view of an abnormality processing apparatus for an in-wheel motor drive device according to another embodiment, and FIG. 4 is a cross-sectional view of the in-wheel motor drive device at a normal time. The normal wheel 5 shown in FIG. 4 may be removed from the hub flange 15 of the inner member 8 and the removed wheel 5 may be fixed to the abnormal bearing 2A. The bearing 2A includes an inner member 3A that is detachably provided on the hub flange 15 of the inner member 8, an outer member 13A having a flange 13Aa that can be attached to the wheel 5, and the inner member 3A, outer member. And a plurality of rolling elements 14 interposed between the raceway surfaces of the member 13A. The bearing 2A is a double-row angular ball bearing, and the rolling elements 14 are balls. Each track surface is formed so that the contact angle is aligned with the back surface.

The inner peripheral surface of the flange 3 </ b> Aa of the inner member 3 </ b> A is fitted to the outer peripheral surface of the guide portion 16. In the inner member 3A, double-row track surfaces are formed on the outer peripheral surface of the shaft portion extending to the outboard side from the flange 3Aa.
The outer member 13A has a wheel mounting flange 13Aa extending radially outward. A plurality of bolt holes are formed in the wheel mounting flange 13Aa, and hub bolts 19 are provided in these bolt holes to fix the wheel of the wheel 5 to the wheel mounting flange 13Aa. At this time, the inner peripheral surface of the wheel 5 is fitted to the outer peripheral surface of the outer member 13A.

  3 and 4, when the in-wheel motor drive apparatus is abnormal, such as when the function of the motor 6 is lost, the normal wheel 5 is removed from the hub flange 15 and the removed wheel 5 is attached to the bearing 2A. Fix it. In this case, the wheel 5 in which the braking force is generated can be used as it is, and the wheel 5 can be freely rotated. Therefore, it is possible to reduce the storage space of the abnormality processing device in the vehicle as much as possible and to improve the versatility of the abnormality processing device. Further, by allowing the wheels 5 to freely rotate regardless of the failure of the function of the motor 6, the vehicle can subsequently travel and can travel to a repair shop or the like on its own.

As shown in FIG. 5, it is good also as an abnormality processing apparatus provided with the trolley | bogie 50 which is provided in the wheel 5 so that attachment or detachment and supports this wheel 5 is supported. The carriage 50 supports the lower part of the wheel 5, and the wheels 51 and 51 are rotatably supported on the front and rear of the lower part of the carriage 50. The carriage 50 includes belts 52, 52 that urge the wheels 5 toward the carriage 50, a tire holding member 53 provided in the middle in the longitudinal direction of each belt 52, and a locking member 54 that locks the belts together. A restraining tool 55 is attached. When a braking force is generated on the wheel 5, the wheel 5 is supported on the carriage 50 by using a jack (not shown), the tire holding member 53 is hung on the tire 56 of the wheel 5, and the belt is connected to the belt by the locking member 54. Lock. At this time, the wheels 5 are urged toward the carriage 50 by the tension of each belt 52. Therefore, the wheel 5 supported by the carriage 50 can be reliably fixed.
Also in this case, regardless of the malfunction of the motor function or the like, by allowing the wheels 5 to freely rotate, it is possible to allow the vehicle to travel thereafter and to travel to a repair shop or the like on its own.

  In each embodiment, a wheel bearing may be directly connected to the output shaft of the motor 6 without a reduction gear.

  FIG. 6 is a block diagram of a control system of the abnormality processing device of any of the in-wheel motor drive devices. In this example, the control unit 95 of the abnormality processing device is provided in the inverter device 22 of the vehicle. The power circuit unit 28 in the inverter device 22 includes an inverter 31 that converts the DC power of the battery 23 mounted on the vehicle into three-phase AC power that is used to drive the motor 6, and a PWM driver 32 that controls the inverter 31. The The motor 6 is composed of a three-phase synchronous motor or the like. The inverter 31 is composed of a plurality of semiconductor switching elements (not shown), and the PWM driver 32 performs pulse width modulation on the input current command and gives an on / off command to each of the semiconductor switching elements.

  The motor control unit 29 includes a computer, a program executed on the computer, and an electronic circuit, and includes a motor drive control unit 33 as a basic control unit. The motor drive control unit 33 is a unit that converts the current command into a current command in accordance with an acceleration / deceleration command based on a torque command or the like given from the ECU 21 that is the host control unit, and gives the current command to the PWM driver 32 of the power circuit unit 28. The motor drive control unit 33 obtains a motor current value to be passed from the inverter 31 to the motor 6 from the current detection unit 35 and performs current feedback control. The motor drive control unit 33 obtains the rotation angle of the rotor of the motor 6 from the angle sensor 36 and performs vector control.

  In this embodiment, the motor control unit 29 in the inverter device 22 is provided with a control unit 95 having a detection unit 39 and an output limiting unit 40. The ECU 21 is provided with an abnormality display means 42. The detection means 39 is a means for detecting an abnormality such as, for example, the motor 6 in the in-wheel motor drive device that has failed to be fixed. For example, the rotation angle of the rotor of each motor 6 is obtained from the angle sensor 36 and If the in-wheel motor drive device 24 in the wheel 5 having a low number of revolutions is determined to be abnormal, it is determined that the difference in the number of revolutions of the wheel 5 is greater than a predetermined threshold value.

  When the detecting means 39 detects that the in-wheel motor driving device 24 is abnormal, the output limiting means 40 limits the output of the motor 6 of the in-wheel motor driving device 24. In other words, the motor current flowing through the motor 6 is limited. Thereby, the unstable behavior of the vehicle can be suppressed. At the same time, the abnormality report means 41 reports an abnormality to the ECU 21, and the abnormality display means 42 of the ECU 21 displays an abnormality on the display device 27 in the driver's seat according to the abnormality report. By displaying the abnormality on the display device 27, the driver can immediately recognize the abnormality, and after stopping the vehicle once, the driver performs the processing at the time of abnormality by any one of the abnormality time processing devices. That is, by providing the hub flange with a bearing that rotatably supports the wheel 5, an appropriate measure can be quickly performed by the driver, such as traveling to a repair shop. In addition to this, the ECU 21 performs control corresponding to the limitation on the output of the inverter device 22 by the output limiting means 40.

  The abnormal time processing device has a traveling mode switching means capable of switching between the normal traveling mode and the temporary traveling mode, and after the abnormal time processing is performed by the abnormal time processing device, the traveling mode switching means You may switch to the temporary travel mode.

DESCRIPTION OF SYMBOLS 2,2A ... Bearing 3A ... Inner member 4 ... Wheel bearing 5, 5A ... Wheel 6 ... Motor 8 ... Inner member (rotating wheel)
13A ... Outer member 13Aa ... Flange 14 ... Rolling element 39 ... Detection means 40 ... Output limiting means 41 ... Abnormality reporting means 50 ... Dolly 95 ... Control unit

Claims (7)

An abnormality processing device that performs processing when an abnormality occurs in an in-wheel motor drive device having a motor and a wheel bearing,
An abnormality processing apparatus for an in-wheel motor drive device, wherein an abnormality bearing for rotatably supporting a wheel is provided separately from the wheel bearing so as to be detachable from a rotating wheel of the wheel bearing. .   2. The in-wheel according to claim 1, wherein the wheel supported by the abnormal bearing is an in-wheel that removes the normal wheel from the rotating wheel and replaces the normal wheel with the abnormal bearing. An abnormality processing device for a motor drive device.   2. The abnormality processing device for an in-wheel motor drive device according to claim 1, wherein the abnormal-time bearing removes a normal wheel from the rotating wheel and fixes the removed wheel.   4. The abnormal bearing according to claim 3, wherein the abnormal bearing includes an inner member fixed to the rotating wheel, an outer member having a flange to which a wheel removed from the rotating wheel can be attached, the inner member, and the outer member. An abnormality processing device for an in-wheel motor drive device, comprising: a plurality of rolling elements interposed between raceway surfaces of a side member. An abnormality processing device that performs processing when an abnormality occurs in an in-wheel motor drive device having a motor and a wheel bearing,
An abnormality processing apparatus for an in-wheel motor drive device, comprising: a carriage that is detachably attached to the wheel and supports the wheel.   The detection means for detecting an abnormality of the in-wheel motor drive device according to any one of claims 1 to 5, and when the detection means detects that the in-wheel motor drive device is abnormal, An abnormality processing apparatus for an in-wheel motor drive device, comprising: an abnormality report means for outputting a warning.   7. The abnormality processing device for an in-wheel motor drive device according to claim 6, further comprising an output limiting device for limiting the output of the motor when the detection device detects that the in-wheel motor drive device is abnormal.

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